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Teleological Arguments Essay - 849 Words

The argument from design or the teleological argument points to the existence of order and direction in nature to a kind of purpose. The argument essentially proves the existence of God. A designer must exist because the universe and living things exhibit marks of design in their complexity. Design-type arguments are unproblematic when based upon things nature plainly could not or would not produce, like human artifacts. If designs entail a designer, and the universe shows marks of design, then the universe was created. An intelligent designer is an entity that the intelligent design movement argues had some role in the development of life. Essentially, the claim being made is that certain aspects of the universe are too perfectly†¦show more content†¦However, if one stumbled across a stone it would be difficult for one to explain how it got there. Secondly, just as the complexity of a watch imply intelligent design, Paley suggested that the universe too implies intelligent design. The eye is usually used as an example of design. â€Å"I know no better method of introducing so large a subject, than that of comparing a single thing with a single thing; an eye, for example, with a telescope† (Klemke 32). Paley stated that both of these are instruments and bear resemblance to one another. In order for the eye or telescope to work, there must be many dissimilar convergent parts that individually have no role but have value only in a designed whole. Therefore, it is only in the joined unity that they exhibit their total function. David Hume counter-argued against the argument from design. He noted that although we know that man-made structures are designed because we have seen them being built, the analogy does not hold for non-man-made structures. A theist must be able to show that natural objects in the universe were manufactured in some way. For example, trees, humans and rocks. The analogy then requires the existence of an intelligent designer. Hume criticizes the claim that artifacts and the universe are similar in the right ways because we have only had experience with just one universe. He rejects the analogy between the material universe and a humanShow MoreRelatedEssay The Teleological Argument1368 Words   |  6 PagesWilliam Paley and David Hume’s argument over God’s existence is known as the teleological argument, or the argument from design. Arguments from design are arguments concerning God or some type of creator’s existence based on the ideas of order or purpose in univer se. Hume takes on the approach of arguing against the argument of design, while Paley argues for it. Although Hume and Paley both provide very strong arguments, a conclusion will be drawn at the end to distinguish which philosophiser holdsRead MoreRichard Swinburnes Teleological Argument790 Words   |  4 PagesRichard Swinburnes Teleological Argument Although explicated on many occasions and by many different authors, the teleological argument for the existence of God provides the best springboard from which to launch contemporary convictions of faith. In the revised edition of his earlier The Existence of God, Richard Swinburne constructs a solid outline that reveals the exact structure of the teleological argument. He presents both forms of the teleological argument , holds each under theRead MoreExamine the Key Features of the Teleological Argument?1491 Words   |  6 PagesExamine the key features of the Teleological argument. The word teleological comes from the Greek word ‘Telos’ which means purpose. The teleological argument is a posteriori and like the cosmological argument, attempts to prove the existence of God. It claims that certain phenomena within the universe appear to display features of design and are perfectly adapted to fulfil their function. Therefore, if features of the universe are so perfectly designed, for example the structure and function ofRead MoreThe Teleological Argument for Gods Existence Essay482 Words   |  2 PagesThe Teleological Argument for Gods Existence The teleological argument is also known as the argument from design. It is the idea that our world and the universe surrounding it are so intricate that it could not happen by accident, it was designed. William Paley put forward perhaps the most famous version of this with the watchmaker argument. Imagine you live on a desolate desert island and one day you come across a watch. By looking at it and examining, the intricateRead MoreThe Teleological Argument For The Existence Of Intelligent Design1273 Words   |  6 PagesThe teleological argument successfully provides proof for the existence of intelligent design by utilizing intricate scientific data in order to demonstrate intent and purpose in the creation of the universe, as opposed to random and highly improbable occurrences. The purpose of the teleological argument is to present complex details of the universe as evidence that it was designed by an intelligent mind. It suggests that since the universe is so compound and full of fine-tuned intricacies, thereRead MoreTeleological Argument for the Existence of God Essay2079 Words   |  9 Pagesexamine the argument put forward by William Paley in 1802, in his Natural Theology. Paley offers an argument from design that purports to show a clear and distinct reason why one should hold a belief in God, due to the inherent features of the world. It is attempted in this paper to firstly: show that the argument should be rejected on the grounds of lacking a rationally flowing set of premises and conclusions; and secondly: that the criticisms made by David Hume concerning the argument hold moreRead MoreExplain the Teleological Arguments for the Existence of God Essay1268 Words   |  6 Pagesthe Teleological arguments The word teleological originates from the Greek ‘telos’ meaning end or purpose. It infers the existence of God from a particular aspect or character of the world, namely the presence of order, regularity and purpose, and thus, is most commonly known as the design argument; it postulates the idea of a designer for all that has been designed. As its name suggests, the teleological argument attempts to seek the ultimate end or purpose. Furthermore, the teleological argumentRead MoreSummary Of On Being An Atheist1341 Words   |  6 Pageshis thoughts on the matter in a journal article in 1968 titled â€Å"On Being an Atheist†. In his article McCloskey aims to discredit cosmological and teleological arguments for a creator and he uses the existence of evil in the world as evidence that a divine creator cannot exist. McCloskey routinely refers to the cosmological and teleological arguments as believers’ â€Å"proof† of God’s existence; however, this is not an accurate statement. (McCloskey, 1968) Foreman points out in his presentation; weRead MoreEssay about The Characteristics of God1108 Words   |  5 PagesThe Characteristics of God In Section eleven of An Enquiry Concerning Human Understanding Hume argues that if a teleological argument is sufficient proof for a god, then that god must have deficiencies in morality, power, benevolence and intelligence. I will present Hume’s argument and the subsequent objections he considers. As well, I will defend Hume’s final position by giving my best objection to it and explaining how that objection fails. Hume chooses to speak about the matter in the style ofRead MoreEssay about The Inadequacy of Paleys Argument from Design1269 Words   |  6 PagesInadequacy of the Argument from Design William Paley’s teleological argument (also known as the argument from design) is an attempt to prove the existence of god. This argument succeeds in proving that while existence was created by an aggregation of forces, to define these forces, as a conscious, rational, and ultimately godlike is dubious. Although the conclusions are valid, the argument makes several logical errors. The teleological argument relies on inductive reasoning, rendering the argument itself valid

The Constitution Law Of The Land Or free essay sample

The Fundamental law: Law Of The Land Or Outdated News Essay, Research Paper The Fundamental law: Law of the Land or Outdated News? Our fundamental law was written over a century ago, by our sires who had thebest purposes. But what they did non hold was a manner to foretell how our society hasevolved, and how the Supreme Law of the Land would come under inquiry. Many partsof the Constitution have been left unfastened to interpretation due to the altering times andstagnance of the Constitution itself. How would our sires feel about new issuesarising? Their original purpose is something we do non cognize. But different argumentsprovide many different sentiments in the populace, and do debate whether or non theConstitution is still the Supreme Law of the Land. Some subjects are more discussed thanothers. In my sentiment, the right to bear weaponries is invariably under inquiry. Free address isalso being brought up, particularly in the instance of music and telecasting. The First Amendment grants us the freedom of address. This gives us as citizensthe right to state what we want, and to show our feelings. But recently, Congress seems tohave been knocking many locales for free address. Television talk shows, wordss in music, and even some publications have been beginnings of contention. But what can go on? Can Congress set a prohibition on these things? But no affair what the content of the talk showis, or how violative the blame wordss are, civil libertarians have taken no stairss to regulatethese things, because of their belief in the Constitution. The Framers of the Constitutionbelieved that to hold a successful democracy, there must be a free exchange of thoughts andthoughts between all people and authorities. The First Amendment is a contemplation of thisbelief. But did they image Jerry Springer holding the KKK on his show, or the 2 LiveCrew blame group naming adult females the B word, and utilizing utmost profanity in all of theirsongs? It is difficult to believe they did. And whenever talk of halting these shows orgroups come up, so does the of all time familiar words of the First Amendment Congress shallmake no jurisprudence # 8230 ; foreshortening the freedom of address or of the imperativeness. But there is someinterpretation of the First Amendment for our protection. Address that is consideredobscene, false, or incendiary is non protected under the First Amendment. Now the FirstAmendment does non state this in its words, but this has been the reading of it inrecent old ages. In the Woll reader, there is an extract by John Stuart Mill that discusses theFirst Amendment rights. He believes that although free address and imperativeness is a right grantedby the Constitution, there must be boundaries placed on them. But this brings up anotherquestion. Where do you pull boundaries? Where does one pull the line that a talkshows content is excessively obscene, or a vocal is excessively coarse to be aired? What is the defini tionof obscene? Of vulgar? There are no disagreements in the Constitution that define theseterms or the limitations that should be used. It merely says freedom of the address and imperativeness. Period. So should we allow these shows and vocals to be aired to the populace, free for viewingby our kids and waxy young person? One must besides maintain in head the creative person andwriters that have come under fire. These wordss may be the voice of the instrumentalist, and thereason they are so coarse is because that is all they saw turning up. Violence in ourinner-cities, coupled with the deficiency of a solid instruction can take to people who know noother life other than an obscene one. So do they have the right to set these wordss on ourstores shelves? If you were a rigorous constitutionalist, so yes these people have the rightto voice their sentiment. More broad positions would believe that this refuse has no topographic point inour society, and is a blazing maltreatment of the ri ghts granted to us. To happen a in-between land anda via media is the challenge, but no reply is within sight. In colonial times, most work forces kept guns and pieces to protect themselves. Thereason for this is because frequently times, the lone defence against the British and Indians werethemselves or local reserves. This was seen as the best manner to maintain peace on order amongthe settlements. The Second Amendment was passed to guarantee this right for these grounds. But the times have changed, and there are no longer local or province reservess. We now havepolice forces, sheriffs, and other local jurisprudence bureaus to function and protect us. As citizens, and as revenue enhancement remunerators, this P rotection is there for us whenever we need. We no longer mustdefend ourselves from British invasion, or will have to quickly organize our neighborhoodinto a force that is ready for battle. So there is no longer a need for citizens to keep andbear arms, right? Wrong. This is another amendment that has come under a lot ofcontroversy lately. Guns are a big concern of our society today. With gang violence, kidsshooting each other, and accidental deaths due to ignorant parents who do not lock uptheir guns, there have been major moves to get the guns off the streets. But this wouldalso force many responsible gun owners to give up their firearms also. The National RifleAssociation has been a huge supporter of the Second Amendment, saying it is theirConstitutional right to keep their weapons. Gun supporters say that many of them usetheir guns for hunting and recreational purposes, and feel safer at home against break-insbecause they have guns for their protection. But the issue of gun cont rol also has itsbacking. The Brady Bill, passed in 1993, imposed a five day waiting period for handguns. Is this bill unconstitutional? I do not think so, but if there were a bill to ban all weapons,then it would be. But did the Framers have the society we live in today in mind when theywrote this amendment? I feel at the time, the bill was passed out of necessity, in order toprotect themselves. Not for gangsters to hold up liquor stores, or have shoot-outs withrival gangs. This amendment, like the freedom of speech and press, is up for debate, andis the root of a lot of controversy. There is no question that at the writing of the Constitution, the Framers had thebest intentions. They were trying to write a constitution that would withstand the ages. Aconstitution that would become the supreme law of the land, and set the framework for astrong democratic government superior to all others. But there was one thing missing thatwould have made the Constitution perfect. A crystal ball. T he Framers had no way to seehow our country would develop and flourish. They wrote the best Constitutional possiblefor the time. Back then, there were no rap groups to abuse the freedom of speech. It wasjust a way to make sure the government could never silence the voice of the people. Theycould not know that we would develop an intricate law system, with strong police forcesin almost every town, and strong judges and courts backing these forces. We also have astrong national armed force, ready to mobilize at a moments notice, whenever ourcountries freedom is being threatened. The criminal justice system we have developedover the years is excellent, and makes the need to bear arms for protection and invasionalmost non-existent. It is understandable that there are responsible people who use gunsfor recreation, but once again, the Framers had no way of foreseeing these people, andother groups like the NRA forming. Although the Framers had no idea of what the future would hold for our country,they did have the right intention. This is what is most important. We must understandthat the Framers were doing what was best for our country. If we can understand that,then we can work for the future. If we can understand the basic concepts and purpose ofthe Framers, we can implement these same intentions to a more modern law. We canratify the Constitution to apply to the changing times, although it is very hard to do, butnot impossible. But we must first understand the original intent. We must not just passthe Constitution off as an outdated governing body. It is a foundation, to help form amore perfect law of the land, so generations after ours will be able to follow its writingsand teachings, both old and new. So what is the final verdict? Is the Constitution outdated, or is it still the SupremeLaw of the Land? Well, I believe that it is a little of both. If we were to take theConstitution word for word, then it can be seen as a piece of writing that cannot governour ch anging times. But if we can interpret it to fit our times, then it is still fine. I am surethat the Framers, if they could see how our world has changed, would be more than happyto let us interpret it to make it current. After all, when they wrote this marvelous work ofart, the had the best intentions for the people as well as the country in mind. By allowingthe Constitution to change slightly, we can hold the values that the Framers had, whichwas to do the best for our country.

The Goddesses as the Ideals Set by Society

In the past, women were revered in their own special way. This was because they were respected as the bearers of children who grew up to be great leaders. Women were held in great esteem and viewed as the back bone of homesteads. Females were recognized as care givers to the children in ancient times. This is evident by the fact that several tales are focused on the upbringing of the children by their mothers. Women were seen emotional and attached to their children.Advertising We will write a custom essay sample on The Goddesses as the Ideals Set by Society specifically for you for only $16.05 $11/page Learn More Homer Hesoid and Hugh G Evelyn-White pointed out that â€Å"they would go to great lengths to protect their children† (109). In ancient Greece, the goddess known as Demeter went on a long search for her daughter, Persephone, who was taken by the son of Cronus, the dark God of the underground kingdom, Hades, unwillingly. Her screams were unheard throughout the land, and only one person heard her shrill. The search of grieving Demeter for her daughter took a long time, and that is the thing that made the tale a legendary one. She traversed the lands looking for Persephone who she loved dearly. It may be interesting to note that although she was a goddess, she even went to the extent of disguising herself as a mortal so that she would be able to get close to mortals and care for a child as her own. The goddess Demeter also wanted to rid of her duties. She planned to do this by disrupting the natural flow of events that would lead to the awful consequences. She stopped the seeds that mortals planted in the earth from sprouting. This was also accompanied by drought that led to deaths among the mortals. All these were because of her frustrations of not being able to find her daughter. It shows that women were ready to sacrifice anything including the lives of the others to save their own children. The goddess wandered ac ross the land with flames in her hands as she searched for her daughter signifying her wrath. She was ready to take on the person who had brought her misery by taking her daughter. Another fact that may be noted is that when she was summoned by Zeus, the King of the Gods, who nobody dared to disobey, she refused to come. This shows her determination. Since it was a severe break of the rules for a god not to sit at the council when required, Demeter was considered to be transgressing. The fact that the king understood her woes and did not interfere in her search shows that women were respected even when they behaved in undignified manner. Such was the case with the Egyptian Goddess Isis who went to did everything possible to ensure that her husband Osiris was brought back to life. When the brother of her husband tricked and killed Osiris, she was very distraught because the killer went ahead and claimed all the property of the dead king for himself. This included Isis who was resentf ul of the whole idea. She went to great lengths to ensure that her husband was resuscitated and even after Set found out that Osiris was about to be brought back to life. He tore up the body of Osiris and scattered it all over the world, but Isis still managed to gather the pieces together and assemble them till they were sewn together and formed the complete body of Osiris.Advertising Looking for essay on history? Let's see if we can help you! Get your first paper with 15% OFF Learn More She did this although she was aware that once a person had died, he/she would not be able to live as a normal person, and this was the case with Osiris who went on to live in the land of the dead as their ruler. As Shah Alam stated â€Å"she also went to the extent of making sure that she conceived the child of Osiris and gave birth to a son sired by Osiris through a spell that she cast† (58). The son that she gave birth to was taken to a land far away in order to grow up and a venge of the death of his father by confronting his uncle. Isis made sure that Set was not aware of the child and the location where the child was being raised because he would have ensured that the child would not have survived. This was because of the natural fear of the vengeance that every child would most likely want to revenge for the death of his/her parent. Due to his mother, Horus grew up knowing that he was going to avenge of the death of his father and fight for his rightful place in the echelons of the society. When he was old enough to face his uncle, his mother stood by her word. According to prophesies, her son won the battle against his uncle that had been lasting for several days. At that time, the feminine ideals of the societies stated that women were minders of the youngsters and as such, the men did not feature much in the matters of upbringing of the children except occasionally. The women were dedicated to the task of raising their children and would not let a nyone to harm their kids. The goddesses in question were quite robust and able to face and manage any challenge when it concerned their children. The story of Nin-Me-Sara, the lady of countless cosmic powers, firmly confirms that fact. In all these cases, the story line is the same since they all wanted to ensure that their off-spring were taken care of and had proper upbringing. The goddesses of Rome, Egypt, Greece and Mesopotamia who had youngsters all had interests in their upbringing. Sometimes, the goddesses would go against the feminine ideals passing beyond the limits. These invisible boundaries were normally drawn by their unwritten laws that stated the position of the women in the society. Woman’s place was supposed to be the home though the goddesses were in charge of various aspects that affected the lives of the individuals. The goddesses were able to reflect the feminine ideals of the society through their commitment and their undying love for their children. Whi le they were ready to break the rules that were in place to save their children, they managed to show that their children meant everything to the, thus they showed that they were good mothers to their children. Elgin stated that â€Å"The feminine ideals of society were put in place to keep order in the society† (88). The goddesses were supernatural and maintained their status of ideal parents.Advertising We will write a custom essay sample on The Goddesses as the Ideals Set by Society specifically for you for only $16.05 $11/page Learn More They managed to do this despite all the difficulties. Isis, for example, was not afraid of Set despite his immense powers and the fact that he had killed the great Osiris. Unlike all the others in the society, she was able to speak up to Set and defy his word. It was understandable that she went through a lot by losing her husband. The resentment that she had for Set was justified in its own way. She went aga inst the norms of the society by following her dead husband’s body and attempting to bring him back to life. Even when Set found out, there was nothing he could do about it since she was strong willed. She shows that a woman’s dedication to her family ought to be undying and absolute. This implies that nothing can come between a strong willed woman and her family. A woman who has been ill-treated by someone else still manages to persevere an asset to the community. As the goddesses of the past showed us in the tales about their families, rules and norms that are set by society are meant to uphold a sense of order and not suppress us. If anyone tries to suppress another person, then the ideals of society can be bent to accommodate the emotional as well as personal vendettas that have been afflicted with individuals. The goddesses show that sometimes transgressing the ideals of society in pursuit of justice is vindicated. These transgressions are justified as long as the y are within certain boundaries. The goddesses know the powers, and the tales show that they did not over-transgressing the ideals set by society. The myths maintain that as much as the goddesses are mystical beings, they are still vulnerable to emotional aspects of life. Works Cited Alam, Shah. Basics of guidance and counseling. Delhi: Global Vision Publishing House, 2009. Print. Elgin, Cathy. Egyptian Myths. California: Windmill Books, 2009. Print. Hesoid, Homer and Hugh G Evelyn-White. Hesoid, the Homeric Hymns and Homerica. Kansas: Digireads Publishing, 2008. Print.Advertising Looking for essay on history? Let's see if we can help you! Get your first paper with 15% OFF Learn More This essay on The Goddesses as the Ideals Set by Society was written and submitted by user Defenders to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

World Literature Essays

World Literature Essays World Literature Essay World Literature Essay Essay Topic: Lolita The God Of Small Things The following article gives a critical analysis in terms of hybridity, immigration and exile of three novels, â€Å"The God of Small Things†, â€Å"Reading Lolita in Tehran† and â€Å"Nervous conditions†. This article gives a brief review and background of all the novels plus a detailed description on how all books dealt with the issues of Hybridity, how it happens and its effects, immigration, its reasons and consequences and exile, the motive behind it and purpose. Comparison of all three novels with respect to the following three points is analyzed here. All the books are written by novelists from countries with one or other political or social dilemmas running their countries, and these novels gives us a pretty good picture of how the people of these countries get affected by this situation. One very obviously similar thing about all these novels is the writer of these stories have all had an experience or a brief run in with many issu es that are portrayed through characters in the novel. All are very interesting and different from conventional stories, bringing to us alive the desperation and despair that people from the countries face. The God of Small Things â€Å"The God of Small things† is an exceptional novel by Arundhati Roy which is telling its readers a story about a highly damaged family from India,  leading them to familiarize with the unhappiness of the characters by personal and intimate cross-questioning. The novel gives us the life story, beginning with the childhood of fraternal twins Rahel and Estha from Kerala, who become fatalities of negative circumstances entering their lives from the very early age. This novel starts off by showing a very strong bond between fraternal twins, Rahel and Estha who have an emotional connection which is more solid than that of most siblings. The music fades and the chorus speaks: Well, here we are. It is Tuesday the Thirteenth of June, one year after the death of her sister Antigone, Ismene sits as Queen. Her hands are trembling as the vacillation of marrying Kerberos lies in the back of her mind. Her engagement to Kerberos has already caused tension among the people of Thebes; riots have been ubiquitous from the marketplace to the royal embassy. Creon died from the same animosity Thebes was in after Antigones death and left the town in discord. Ismene evokes the image of angry Theban peasants grabbing Creon and hanging him in the square, for all to see. She shivers and frowns. All to see except Oedipus and Antigone, who should have seen it. Ismene opens the book in front of her and begins reading the first stanza: Nobody likes the man who brings bad news. Suddenly, Kerberos opens the door with a wild smile. He motions Ismene to come to him. Ismene walks slowly toward him, her dress quivering. The cold wintry wind blew the pages of Ismenes book to a page with faded words. However, one line remains bold: How dreadful it is when the right judge judges wrong! The chorus exits. KERBEROS: Ismene, darling, it is late. You should go get some sleep. The moon is even lamenting from your discontent. What is bothering you? ISMENE [looking up with sorrow]: I just cant stop thinking about the riots that have been going on. The guards have already captured hundreds of civilians already for mutiny and insurrection. I do not know why my people do not trust you. KERBEROS: The guards are fine now, arent they? Your people are just probably scared of a new throne. ISMENE: Or are they? What about those mysterious killings just after you proposed to me, Kerberos? So far, ten scribes, twenty guards, and two cooks have been poisoned. Im beginning to doubt if this marriage is going to work. We love each other, right? KERBEROS [with slight hesitation]: There is no question how much you mean to me, Ismene. You are the wind beneath my wings, my guiding light, my everything. Kerberos holds Ismene tightly, his lips close to hers. Ismene gently touches Kerbeross face, but Kerberos backs away. KERBEROS [smiles]: You need your rest. Until tomorrow, my love. ISMENE [sheepishly]: Until tomorrow. The stage closes. In the dark dungeon of Thebes lies a man with a hooded cape and Kerberos. The marble sidewalks laid in oblivion to the iniquity of the night. MAN [annoyingly]: What now, Kerberos? KERBEROS: I need ten more. Ill give you one hundred pounds and you must swear to keep your mouth shut. The mans eyes glistened as he hands Kerberos bottles of a deep black potion in exchange of shiny, golden coins. MAN: Next time, the price will be doubled. The stage lights to reveal Ismenes bedchambers. A small candle flickers in the distance. A huge hourglass piece is centered on a wooden desk. Ismene slowly steps to the candle lights and watch it go dim. Suddenly, a servant knocks on her door urgently SERVANT [knocking]: Miss, I have something important to tell you. ISMENE [opens the door reluctantly]: Does it have to wait until the sun has fallen and the stars have gone to sleep? SERVANT: It is urgent. My mum has told me to shut my mouth, but you should deserve to know. ISMENE: What is so imperative that you have waited the wanton of hours to tell me? SERVANT [quietly]: Poison was found hidden beneath Kerbeross drawer while my mum was cleaning his room. I think he might be dangerous.. ISMENE: Dont be ridiculous. Although Kerberos looks healthy, hes a very sick man. Those are probably the remedies for his ailing conditions. SERVANT [confidently]: I assure you that ISMENE [interrupts]: Everything will just be fine. I have lots on my mind. Now if you will just excuse me. SERVANT [disappointedly mumbles]: Ill let you be. Stage closes. Random voices are heard from within the chorus, now acting as a crowd before the Queens wedding. Voice 1: Where is she? Shes late by forty minutes! Voice 2: Shell be here. Ismene is always late. Voice 3: Maybe she finally found her conscience and disowned that brat. They turn to see Kerberos approaching from stage left in regal garb. Voice 3 [laughs]: Look it him, he looks like hes drowned with tarred feathers. Voice 4: That imbecile should deserve to go to starvation and die. Voice 2: I hope Ismene comes soon. This wedding is starting to look desolate. KERBEROS[turning to the voices]: Shut up. I do not have time for your ti te-i -ti te nonsense. Your disrespect is impervious. It is not your wedding day. Voice 5 [mumbling]: Nor is it yours. Silence stumbled upon the voices as Ismene opens the white doors. Her face looks paler than the depths of her pallid, white dress. However, her eyes shimmered as she say Kerberos. Ismene walks down the aisle as eyes of despondency lay hidden in the audiences eyes. Suddenly, she falls dramatically down, her legs feebly trying to get up. Kerberos rushes to her side. KERBEROS [cautious]: Are you alright Ismene? ISMENE [weakly]: I feel so. enervated. Voice 1: Maybe we should postpone the wedding. Our highness looks too anemic. Voice 2 [agreeing]: Lets put her to rest KERBEROS [flustered]: Silence! Ismene needs to marry me today. It is my her special day! ISMENE [faintly]: Kerberos.. Ismene grabs Kerberos hand as she pulls herself up and continues to walk down the aisle. The intonation of disapproval surrounded the church. After they exchanged vows, Ismene suddenly falls down on the white marble floor while Kerberos disappears into the distance. Kerberos menacingly grins as he holds a bottle of black potion beneath his fingertips.

Intruder to Queen Elizabeths Bedroom

Intruder to Queen Elizabeths Bedroom Early on Friday morning, July 9, 1982, Queen Elizabeth II woke to find a strange, bleeding man sitting at the end of her bed. As scary as the situation must have been, she handled it with royal aplomb. A Strange Man at the End of the Queens Bed When Queen Elizabeth II woke up on the morning of July 9, 1982, she saw that a strange man was sitting on her bed. The man, dressed in jeans and a dirty T-shirt, was cradling a broken ashtray and dripping blood onto the royal linens from a lacerated hand. The Queen kept calm and picked up the phone from her bedside table. She asked the operator at the palace switchboard to summon the police. Though the operator did pass the message to the police, the police didnt respond. Some reports say the intruder, 31-year-old Michael Fagan, had planned to commit suicide in the Queens bedroom but decided it wasnt a nice thing to do once he was there. He wanted to talk about love but the Queen changed the subject to family matters. Fagans mother later said, He thinks so much of the Queen. I can imagine him just wanting to simply talk and say hello and discuss his problems. Fagan thought it a coincidence that he and the Queen both had four children. The Queen attempted to summon a chambermaid by pressing a button, but no one came. The Queen and Fagan continued to talk. When Fagan asked for a cigarette, the Queen again called the palace switchboard. Still, no one responded. After the Queen had spent ten minutes with the mentally disturbed, bleeding intruder, a chambermaid entered the Queens quarters and exclaimed, Bloody hell, maam! Whats he doing in there? The chambermaid then ran out and woke up a footman who then seized the intruder. The police arrived twelve minutes after the Queens first call. How Did He Get into the Queens Bedroom? This wasnt the first time that protection of the royal monarch had been found lacking, but it had supposedly been increased since the 1981 attack on the Queen (a man fired six blanks at her during the Trooping the Color ceremony). Yet Michael Fagan basically walked into Buckingham Palace - twice. Only a month before, Fagan had stolen a $6 bottle of wine from the palace. Around 6 a.m., Fagan climbed the 14-foot-high wall - topped with spikes and barbed wire - on the southeast side of the palace. Though an off-duty policeman saw Fagan climbing the wall, by the time he had alerted palace guards, Fagan could not be found. Fagan then walked along the south side of the palace and then along the west side. There, he found an open window and climbed in. Fagan had entered a room housing King George Vs $20 million stamp collection. Since the door to the interior of the palace was locked, Fagan went back outside through the window. An alarm had been set off both as Fagan entered and exited the Stamp Room through the window, but the policeman at the police sub-station (on palace grounds) assumed the alarm was malfunctioning and turned it off - twice. Fagan then went back as he had come, along with the west side of the palace, and then continuing along the south side (past his point of entry), and then along the east side. Here, he climbed up a drainpipe, pulled back some wire (meant to keep pigeons away) and climbed into Vice Admiral Sir Peter Ashmores office (the man responsible for the Queens security). Fagan then walked down the hallway, looking at paintings and into rooms. Along his way, he picked up a glass ashtray and broke it, cutting his hand. He passed a palace housekeeper who said good morning and only a few minutes later he walked into the Queens bedroom. Normally, an armed policeman stands guard outside the Queens door at night. When his shift is over at 6 a.m., he is replaced with an unarmed footman. At this particular time, the footman was out walking the Queens corgis (dogs). When the public learned of this incident, they were outraged at the lapse of security around their Queen. Prime Minister Margaret Thatcher personally apologized to the Queen and measures were immediately taken to strengthen palace security. Sources Davidson, Spencer. God Save the Queen, Fast. TIME 120.4 (July 26, 1982): 33. Rogal, Kim and Ronald Henkoff. Intruder at the Palace. Newsweek July 26, 1982: 38-39.

Final Exam Essay Example | Topics and Well Written Essays - 1250 words - 3

Final Exam - Essay Example Rondell Corporation traversed the path of success and growth in innovative engineering design of electrical items and radio broadcasting equipments. However, it failed to revamp its organizational structure and establish links between departments to restore mutual cooperation and consensus. This paper aims to look at the sources of conflicts at Rondell. With reference to Pondy’s model of organizational conflict, recommendations follow to improve the power relations, interdependencies and overall performance of the company. Prime culprit behind burgeoning conflicts at Rondell Corporation is ineffective organizational structure and power distribution. Though seemingly simple, poorly defined structure starts developing the following loopholes which ultimately leads to reduced agreement between departments and key personnel. Parent & Slack (1997, p. 221) opine that if an organizational is undergoing tumultuous phase due to differentiation and ambiguous roles, setting up of formalized rules, policies and norms of work practices and behavior can help solve the issues. High formality results in shaping up doubts, unclear job roles and even reciprocal interdependence. At Rondell, informal organizational structure rules the day-to-day operations. Departments have made subunits that in turn are running their individual politics and tactics to fulfill their personal interests. Lack of formalization has made departmental goals overshadow organizational objectives. Differentiation refers to dividing the tasks into smaller parts and allocating them to subunits of departments for better fulfillment of goals. Rondell has five major units or functions namely sales, engineering services, research and development (R&D), production and control. Though individual subunit orientation is necessary to contribute effectively to organization’s growth, these five departments at Rondell have deviated too far

Business Data Analysis Essay Example | Topics and Well Written Essays - 3500 words

Business Data Analysis - Essay Example The distribution of sales from each customer is analyzed to identify the most important customers. The call times for various calls are analyzed to identify the number of employees that need to be kept. Based on the analysis done, it is evident that company needs to analyze its performance with respect to quarter as well as profit center. The company needs to have 5 employees making sales calls. At the same time, the company was able to identify the most profitable customers on whom it needs to focus on. Introduction Laurel McRae has recently joined Handy Hydraulics for data analysis and strategic planning. In order to analyze the performance of the sales of the organization, Laurel collected the data for the sales for third and fourth quarter of 1990 and first and second quarter of 1991. She also collected the data regarding the machines and the days when they are working and various alternatives to replace the existing system. Number of calls received per hour was collected to anal yze the sales call being made and number of employees that shall be entrusted with the responsibility of handling calls. She also collected data regarding sales from each customer. This data enables Laurel find the company’s most profitable and least profitable customers. ... answers: Answer 1 a.) Histograms and relative frequency distributions of the company’s daily average order size for quarters 1 and 2 In the simplest of terms, histogram can be defined as a series of contiguous bars or rectangles representing frequency of the data in given intervals (Black, 2009). Histogram is a very useful tool to analyze the frequencies of different class interval. The daily average order size can be calculated as dividing the total sales by total orders. The table below shows the frequency table for the organization’s daily average order size for Q1 and Q2: Range Frequency Q1 Frequency Q2 220 0 0 Table 1: The frequency distribution table for daily average order size for Q1 and Q2 As can be seen from the table, majority of the frequency is concentrated towards the middle. The frequencies for Q1 as well as Q2 are 0 for all the intervals till the average order size of 59. While there is no daily average order size above 220 for Q1, there is no daily aver age order size above 200 for Q2. The best way to analyze this frequency distribution table is to analyze the histogram. The graph below shows the histogram for the company’s daily average order size for Q1 and Q2: Figure 1: Histogram of company’s daily average order size for Q1 and Q2 As can be seen from the graph, the frequency for both the seasons can be thought of following a normal curve. For Q2, the highest frequency is in the range of 100-119, while for Q1, the highest frequency is in the range of 120-139. b.) Quarterly charts for the company’s total number of orders per day The table below shows the frequency distribution for the total number of orders

Communicable Disease Paper Essay Example for Free

Communicable Disease Paper Essay Hepatitis B is a viral infection that is caused by the hepatitis B virus (HBV). It attacks the liver and can cause both acute and chronic disease. Acute HBV is less than six months and ones immune system is able to fight and clear the infection. Chronic HBV lasts longer than six months and ones immune system is unable to fight the infection leading to liver failure, cancer or cirrhosis. Occasionally chronic HBV can go undetected for years due to a person being asymptomatic (Mayo Clinic, 2011). Mode of Transmission In highly infected areas of the world, HBV is most commonly spread from mom to baby at birth or from person to person in early childhood (World Health Organization [WHO], 2013). The HBV is also spread via parenteral contact with infected blood or blood products, sharing of or accidental needle sticks and having unprotected sex with one who’s blood, saliva, semen or vaginal secretions are infected and enter your body (Copstead and Banasik, 2010). Signs and Symptoms Signs and symptoms of HBV may never appear or appear over a two to six month period. Signs and symptoms include abdominal pain, dark urine, fever, joint pain, loss of appetite, nausea and vomiting, weakness and fatigue and jaundice (yellowing of the skin and or sclera) (Mayo Clinic, 2011). Complications Having chronic HBV can lead to serious life threatening complications such as, cirrhosis, liver cancer, failure, hepatitis D infection or kidney failure. Liver cirrhosis occurs when HBV has caused inflammation to liver leading to scaring and formation of fibrotic cell tissue that blocks hepatic blood flow and cell function. This in turn results in overgrowth of new cells attempting to regenerate causing decreased liver function Liver cancer and failure can occur if a patient has cirrhosis due to being a risk factor (Copstead and Banasik, 2010). Treatment Treatment of HBV is supportive. Care focuses on nutrition, hydration and comfort (WHO, 2013). For those who have been infected with acute HBV, may not even need treatment but only management of symptoms. Those infected with chronic HBV may need more invasive treatments such as, antiviral medications or need a liver transplant (Mayo Clinic, 2011). Antiviral medications are used to slow and fight the virus from destructing the liver. Liver transplants are an option if a patient has end-stage liver disease where traditional treatments have not worked and are a qualified candidate (Copstead and Banasik, 2010). Demogrphics Approximately 60,000 people die every year from HBV (WHO, 2013). There are about 200 billion people living around the world with HBV with an estimated 1. 2 million living in the United States (CDC, 2013). In 2011 the United States was estimated to have 18,800 actual new cases of the HBV (CDC, 2013). Those who are at greatest risk for developing HBV are Asian and Pacific Islanders, African Americans, gay and bisexual individuals, those who have multiple sex partners and do not practice safe sex or are intravenous drug users. Gay and bisexual men make up 20% of new HBV cases and 50% Asian and Pacific Islanders are living with HBV (CDC, 2013). Most Asian and Pacific Islanders were infected with HBV as infants or children and 1 in 12 are living with it and are not even aware. Determinants of Health Environmental factors such as living conditions, social networks and social support systems are all key drivers for one becoming infected with the HBV. For example, a homeless person who has a poor health status, is uninsured, unemployed and has a lack of education is more likely to be diagnosed with HBV. Also certain races are more likely to be infected with the HBV, as stated above, Asian and Pacific Islanders make up 50% of the population living with HBV (CDC, 2013). In addition there is a lack of resources available to protect, improve and maintain one health due to the cost and lack of good health services to individuals with low socioeconomic backgrounds. Therefore, focus needs to be made on improving access to care as well as treating the environmental and social factors of health. Epidemiologic Triangle The epidemiologic triangle is used to analyze the natural history of a disease. It asses the agent â€Å"what†, host â€Å"who† and environment â€Å"where† (Maurer and Smith, 2013). The biological agent for hepatitis B is a virus. The host’s demographics can range from infancy into adulthood and any race is susceptible to the virus. The body’s defenses are more likely to fight off acute than chronic HBV. A person’s behavior as well plays a large role in one becoming infected. Those who are intravenous drug users or have a history of multiple sex partners are my susceptible to developing HBV. Environmental factors based on social and economic considerations could be direct person-to-person contact of bodily fluids via kissing or sexual intercourse or receiving contaminated blood products from infected individuals. Within the workplace, an individual could accidently prick himself or herself with a contaminated needle increasing their chances of becoming infected. Role of Community Health Nurse It is important for the community health nurse to educate and promote prevention of HBV. Teaching risk reduction interventions and strategies such as not having unprotected sex and using condoms can help prevent transmission of hepatitis B. For those who have already become infected with the HBV it’s important to provide timely referrals for sexual health related services to further prevent others from becoming infected. Making the hepatitis vaccinations more accessible and available is an effective way to prevent hepatitis B. Educating health and human service providers about hepatitis B promotes quality of care and awareness as well as reduces chances of transmission. Ensuring adequate resources are available (state and local surveillance) to accurately monitor disease trends, transmission and how effective treatment is can improve and ensure correct data collection. It’s also important that the nurse refers patients to accessible care and treatment facilities so that compliance can be obtained and the rate of transmission, morbidity and mortality can be reduced. National Organization The World Hepatitis Alliance is a non-profit international umbrella non-governmental organization that represents every region of the world with viral hepatitis. They raise awareness, reduce the stigma associated with viral hepatitis, work with the WHO and provide preventive care as well as support and access to treatment. Their goal is eradication of HBV and HCV. They plan on achieving this goal by having more countries with a complete hepatitis strategy in place, regional patient organizations in all WHO regions, on going support for global hepatitis groups, acceptance at a global level of HBV and HCV, increased alliance and a more diversified funding base for the alliance. Conclusion There are two billion people worldwide that are infected with HBV and more than 350 million are infected with chronic liver infections, which increases their risk of death significantly (Maurer and Smith, 2013). Fortunately, there is a vaccine for hepatitis B but it has not become easily accessible to those in developing countries. This is a virus that can be prevented if individuals are being educating on the causes and risks as well as ways to protect themselves. It is up to us healthcare providers to spread awareness and makes our patients more knowledgeable about the types of communicable disease in our world so that they can make healthy choices.

The Notion of Good and Evil in Stevensons Dr Jekyll and Mr Hyde Essay

The Notion of Good and Evil in Stevenson's Dr Jekyll and Mr Hyde The book entitled 'The Strange Case of Dr Jekyll and Mr Hyde' was published in 1886. Although in the book Stevenson does not ever state the exact year, it was at the time recognized immediately as a grand work. The main theme running throughout the book is about the duality of human beings and the battle in all humans between good and evil. This book is very allegorical because the characters and events are representing other things and symbolically expressing a deeper spiritual and moral meaning. For humans the battle between the potential for extreme good and extreme evil is in the mind, but Jekyll's experiment has given one man a split personality of the two extremes in the physical realm. The book also involves a theme of hypocrisy, as shown by Jekyll and Hyde of Victorian society. On one hand it was pleasant society, respectable, conventional, deeply religious, and polite. On the other was a much more bohemian England, symbolized by dishonesty and darkness. The combination of the two aspects in contrast to each other made an impression on Stevenson. This was a world of appearance not truth with Victorian oppression, fighting against basic human nature. Throughout the story is an omniscient narrator who tells the story from full view of different people with different perspectives (e.g. the view of the maid lets us into her feelings and attitudes towards Hyde). The author could have chosen another route by possibly telling the story as a confession from Jekyll's point of view. The author chose not to write in this way because he wanted to give a view of... ...This is a warning from Stevenson to the reader not to take the easy way out. It also proves that Stevenson wants the reader to judge Jekyll harshly as he was weak and took the "cowards" path out, which lead to his death. Although Jekyll seems to have no control over Hyde, once he has transformed, it is Jekyll's original attitude towards evil in the first place, which brings him trouble. He sees the ability to lose moral control and be free from the ties of society as a kind of liberation, which is why the transformation into Mr Hyde is so appealing to him. It is not that he has no regard to society as a whole, or he wouldn't need to turn into Hyde, but that he cannot tolerate that certain behaviour is prohibited. By becoming Hyde, Jekyll can follow his wildest imaginations without worrying about the consequences.

Metals are electropositive chemical elements

Metals are electropositive chemical elements that are characterised by the following qualities: ductility, malleability, luster, opacity, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. Density is defined as a material's mass divided by its volume. Metals typically have relatively high densities, particularly when compared to polymers. Often, materials with high densities contain atoms with high atomic numbers, such as gold or lead. However, some metals such as aluminum or magnesium have low densities. These metals are useful in applications requiring other metallic properties but in which low weight is also beneficial. Fracture Toughness can be described as a material's ability to avoid fracture, especially when a flaw is introduced. Glass, for example, has low fracture toughness (although it exhibits high strength in the absence of flaws). Metals typically have high fracture toughness. Metals can generally contain nicks and dents without weakening very much. They are also impact resistant. A football player relies on this fact to ensure that his facemask won't shatter. The roll cage on a racecar, for example, is created from steel. This steel should remain intact in a crash, protecting the driver. The ability of a material to bend or deform before breaking is known as plastic deformation. Some materials are designed so that they don't deform under normal conditions. You don't want your car to lean to the east after a strong west wind, for example. However, sometimes we can take advantage of plastic deformation. The crumple zones in a car absorb energy by undergoing plastic deformation before they break. Stress takes place when forces pull (this is known as tension), push (compression) or act in combination on a material. Once the force is applied, the material responds by distorting, counterbalancing the force. With a larger force, there will be a correspondingly greater distortion until the item breaks. Stress is the force applied per unit of cross-sectional area square to the force. This can be expressed mathematically as:: Stress (s) = Force / unit of area The metric system units for stress are Newton per square meter (N/m2) and imperial system units are pounds per square inch (psi). Strain is the amount the material deforms from the unloaded state when the force is applied. Its formula is: Strain (x) = Change in length / original length Since strain is a ratio of length divided by a length, it has no units. By the formula, we can see that it represents a proportional change in size. Deformation occurs when a force is applied to a metal. The metal is therefore strained. The greater the force – the more the deformation (strain). This relationship is recognised in Hooke's Law. Hooke's Law describes an elastic region where stress and strain are proportional (a straight line on a graph). In this region the metal acts like a spring and when the load is removed the deformation (strain) reduces and it returns to its original shape. If instead the load increases, the strain (deformation) rises and the metal undergoes uniform plastic deformation. The stress-strain graph is curved in this region. Eventually, a maximum stress is reached when the metal when the material reaches its limit of necking. Necking is localized thinning that occurs during sheet metal forming prior to fracture. The onset of localized necking is dependent upon the stress state which is affected by geometric factors. Finally, past the maximum stress point, a point is reached where the metal can no longer sustain the load and it yields. The behavior of metals under load is a result of their atomic arrangement. When a material is loaded it deforms minutely in reaction to the load. The atoms in the material move closer together in compression and further apart in tension. The amount an atom moves from its neighbor is its strain. As a force is applied the atoms change a proportionate distance. This model however, does not explain why there is sudden yielding. With most modern metals yielding usually occurs at about 1% of the theoretic strength of the atomic bonds. Many materials yield at about 0.1% of the theoretic strength. Rather, metals exhibit such low strengths because of imperfect atomic structures in the crystal lattices which comprise them. A row of atoms will often stop mid crystal, creating a gap in the atomic structure. These gaps act as dislocations, which are huge stress raising points in the metal. These dislocations move when the metal is stressed. A dislocation is defined as allowing atoms to slip one at a time, making it easier to deform metals. Dislocation interactions within a metal are a primary means by which metals are deformed and strengthened. When metals deform by dislocation motion, the more barriers the dislocations meet, the stronger the metal. The presence of dislocations in metal allows deformation at low levels of stress. However, eventually so many dislocations accumulate that insufficient atoms are left to take the load. This causes the metal to yield. Plastic deformation causes the formation of more dislocations in the metal lattice. This has the potential to create a decrease in the mobility of these dislocations due to their tendency to become tangled or pinned. When plastic deformation occurs at temperatures low enough that atoms cannot rearrange, the metal can be strengthened as a result of this effect. Unfortunately, this also causes the metal to become more brittle. As a metal is used, it tends to form and grow cracks, which eventually cause it to break or fracture. Atoms of melted metal pack together to form a crystal lattice at the freezing point. As this occurs, groups of these atoms form tiny crystals. These crystals have their size increased by progressively adding atoms. The resulting solid, instead of being a single crystal, is actually many smaller crystals, called grains. These grains will then grow until they impose upon neighbouring growing crystals. The interface between the grains is called a grain boundary. Dislocations cannot easily cross grain boundaries. If a metal is heated, the grains can grow larger and the material becomes softer. Heating a metal and cooling it quickly (quenching), followed by gentle heating (tempering), results in a harder material due to the formation of many small Fe3C precipitates which block dislocations. The atomic bonding of metals also affects their properties. Metal atoms are attached to each other by strong, delocalized bonds. These bonds are formed by a cloud of valence electrons that are shared between positive metal ions (cations) in a crystal lattice. These outer valence electrons are also very mobile. This explains why electrons can conduct heat and electricity – the free electrons are easily able to transfer energy through the material. As a result, metals make good cooking pans and electrical wires. In the crystal lattice, metal atoms are packed closely together to maximize the strength of the bonds. It is also impossible to see through metals, since the valence electrons absorb any photons of light hitting the metal. Thus, no photons pass through. Alloys are compounds consisting of more than one metal. Creating alloys of metals can affect the density, strength, fracture toughness, plastic deformation, electrical conductivity and environmental degradation. As an example, adding a small amount of iron to aluminum will make it stronger. Alternatively, adding some chromium to steel will slow the rusting process, but will make it more brittle. Some alloys have a higher resistance to corrosion. Corrosion, by the way, is a major problem with most metals. It occurs due to an oxidation-reduction reaction in which metal atoms form ions causing the metal to weaken. The following technique that has been developed to combat corrosion in structural applications: sacrificial anode made of a metal with a higher oxidation potential is attached to the metal. Using this procedure, the sacrificial anode corrodes, leaving the structural part, the cathode, undamaged. Corrosion can also be resisted by the formation of a protective coating on the outside of a metal. For example, steels that contain chromium metal form a protective coating of chromium oxide. Aluminum is also exhibits corrosion resistant properties because of the formation of a strong oxide coating. The familiar green patina formed by copper is created through a reaction with sulfur and oxygen in the air. In nature, only a few pure metals are found. Most metals in nature exist as ores, which are compounds of the metal with oxygen or sulfur. The separation of the pure metal from the ore typically requires large amounts of energy as heat and/or electricity. Because of this large expenditure of energy, recycling metals is very important. Many metals have high strength, high stiffness, and have good ductility. Some metals, such as iron, cobalt and nickel are magnetic. Finally, at extremely low temperatures, some metals and intermetallic compounds become superconductors. Ceramic: Ceramic materials are inorganic, nonmetallic materials, typically oxides, nitrides, or carbides. Most ceramics are compounds between metallic and nonmetallic elements in which the interatomic bonds are either totally ionic, or predominantly ionic but having some covalent character. While many adopt crystalline structures, some form glasses. The properties of the ceramics are due to their bonding and structure. The term ceramic comes from the Greek word keramikos, which means burnt stuff! This signifies that the desirable properties of these materials are typically achieved through a high-temperature heat treatment process. This process is called firing. Ceramics are often defined to simply be any inorganic nonmetallic material. By this definition, glasses are also ceramic materials. However, some materials scientists state that a true ceramic must also be crystalline, which excludes glasses. The term â€Å"ceramic† once referred only to clay-based materials. However, new generations of ceramic materials have tremendously expanded the scope and number of possible applications, broadening the definition significantly. Many of these new materials have a major impact on our daily lives and on our society. Ceramics and glasses possess the following useful properties: high melting temperature, low density, high strength, stiffness, hardness, wear resistance, and corrosion resistance. Additionally, ceramics are often good electrical and thermal insulators. Since they are good thermal insulators, ceramics can withstand high temperatures and do not expand greatly when heated. This makes them excellent thermal barriers. The applications of this property range from lining industrial furnaces, to covering the space shuttle, shielding it from high reentry temperatures. The aforementioned glasses are transparent, amorphous ceramics which are extensively used in windows and lenses, as well as many other familiar applications. Light can induce an electrical response in some ceramics. This response is called photoconductivity. An example of photoconductivity occurs in fiber optic cable. Fiber optic cable is speedily replacing copper for communications – optical fibers can transmit more information for longer distances, and have less interference and signal loss than traditional copper wires. Ceramics are also typically strong, hard, and durable materials. As a result, they are attractive structural materials. One significant drawback to their use is their brittleness. However, this problem is being addressed by the creation of new materials such as composites. While ceramics are typically good insulators, some ceramics can actually act as superconductors. Thus, they are used in a wide range of applications. Some (the good insulators) are capacitors, others semiconductors in electronic devices. Some ceramics are piezoelectric materials, which convert mechanical pressure into an electrical signal. These are extremely useful for sensors. For superconducting ceramics, there is a strong research effort to discover new high Tc superconductors and to then develop possible applications. Processing of crystalline ceramics is based on the basic steps which have been used for ages to make clay products. The materials are first selected, then prepared, formed into a required shape, and finally sintered at high temperatures. Glasses, on the other hand, are typically processed by pouring while in a molten state. They are then worked into shape while hot, and finally cooled. There are also new methods, such as chemical vapor deposition and sol-gel processing, currently being developed. Ceramics have a wide range of applications. For example, ceramic tiles cover the space shuttle as well as our kitchen floors. Ceramic electronic devices make possible high-tech instruments for everything from medicine to entertainment. There are also some special properties which a few ceramics possess. For example, some ceramics are magnetic materials and, as mentioned above, some have piezoelectric properties. The one major drawback of ceramics and glasses is that they are brittle. As mentioned above, certain types of ceramics possess superconducting properties at extremely low temperatures. For example, there are high-temperature superconducting ceramic materials that have recently been discovered. These materials exhibit virtually no electrical resistance below 100 degrees Kelvin. Also, these materials exhibit what is known as the Meissner effect. This means that they repel magnetic flux lines, allowing a magnet to hang in the space above the superconductor. An example of special group of crystalline ceramics is the group called Perovskites. They have captured the interest of geologists due to the information they can yield about Earth's history. The most intensely studied Perovskites at the present time are those that superconduct at liquid nitrogen temperatures. Ceramics were historically used for creating pottery and artwork, largely because the brittleness and difficulty of manufacturing ceramics restricted them from other uses until recently. However, the market requirement for microelectronics and structural composite components has risen, causing the demand for ceramic materials to likewise increase. Fiber-reinforced composites, an example of a modern ceramic application, are being created from ceramic fibers with extremely high stiffness, such as graphite and aluminum oxide. Polymers: Polymers are substances which contain a large number of structural units joined by the same type of linkage. They are any of many natural and synthetic compounds, usually of high molecular weight. They typically consist of up to millions of repeated linked units, each a relatively light and simple molecule. These substances often form into a chain-like structure. Some polymers have been around since the beginning of time in the natural world. For example, starch, cellulose, and rubber all possess polymeric properties. Man-made polymers, a relatively recent development, have been studied since 1832. However, the polymer industry today has is larger than the aluminum, copper and steel industries combined. Polymers have a huge range of applications that greatly surpasses that of any other class of material available to man. Current applications include adhesives, coatings, foams, packaging materials, textile and industrial fibers, elastomers, and structural plastics. Polymers are also widely used for many composites, electronic devices, biomedical devices, optical devices, and precursors for many newly developed high-tech ceramics (such as the fiber-reinforced composite mentioned at the end of the ceramic section). The word polymer literally has the meaning â€Å"many parts.† A polymeric solid material can be considered to be one containing many chemically bonded parts or units, themselves which are bonded together to form a solid. Polymers are typically good insulators. While a large variety of polymer applications were described above, two of the most industrially important polymeric materials are plastics and elastomers. Plastics are a large and varied group of synthetic materials. They are processed by forming or molding into shape. There are many types of plastics such as polyethylene and nylon. Polymers can be separated into two different groups depending on their behaviour when heated. Polymers with linear molecules are often thermoplastic. Thermoplastic substances soften upon heating and can be remolded and recycled. They can be semi-crystalline or amorphous. The other group of polymers is the thermosets. In contast to thermoplastics, these substances do not soften under heat and pressure and cannot be remolded or recycled. Instead, they must be remachined, used as fillers, or incinerated to remove them from the environment. Thermoplastics are typically carbon-containing polymers which are synthesized by addition or condensation polymerization. This procedure forms strong covalent bonds within the chains and weaker secondary Van der Waals bonds between the chains. Normally, the secondary forces can be easily overcome by thermal energy, which makes thermoplastics moldable at high temperatures. After cooling, thermoplastics will also retain their newly reformed shape. Common applications of thermoplastics include parts for common household appliances, bottles, cable insulators, tape, blender and mixer bowls, medical syringes, mugs, textiles, packaging, and insulation. Thermosets exhibit the same Van der Waals bonds that thermoplastics do. They also have a stronger linkage to other chains. Different chains together in a thermoset material are chemically held together by strong covalent bonds. The chains may be directly bonded to each other, or alternatively may be bonded through other molecules. This â€Å"cross-linking† between the chains is what allows the material to resist softening upon heating. Thus, thermosets must be machined into a new shape if they are to be reused or they can serve as powdered fillers. However, while thermosets are difficult to reform, they have many distinct advantages in engineering design applications. These include high thermal stability and insulating properties, high rigidity and dimensional stability, resistance to creep and deformation under load, and low weight. A few common applications for thermosets include epoxies (glues), automobile body parts, adhesives for plywood and particle board, and as a matrix for composites in boat hulls and tanks. The polymer molecule, a long chain of covalent-bonded atoms, is the basic building block of a plastic. Polymers are typically carbon based and have relatively low melting points. Polymers have a very wide range of properties that enable them to be extensively used in society. Some uses include car parts, food storage, electronic packaging, optical components, and adhesives. Synthetic fabrics are essentially man-made copies of natural fabrics. Synthetic fibers do not occur in nature as themselves. They are usually derivatives of petroleum products. Examples of common synthetic fabrics are polyester, spandex, rayon, and velcro. Recent technological developments have lead to electrically conductive polymers. The behaviour of semiconductors can now be achieved with polymeric systems. For example, there are semiconducting polymers which, when sandwiched between two electrodes, can generate light of any color. This technology has the potential of leading to OLED (organic light-emitting diode) flat panel displays. This display would be light in weight, have low power consumption, and perhaps be flexible. Liquid crystals are another example of polymeric materials. As the name suggests, a liquid crystal is a state of matter intermediate between a standard liquid and a solid. Liquid crystal phases are formed from geometrically anisotropic molecules. This typically means they are cigar shaped, although other shapes are possible. The polymer molecules have a certain degree of order in a liquid crystal phase. Take the simplest case, the Nematic phase, in which the molecules generally point in the same direction but still move around with respect to one another as would be expected in a liquid. However, under the influence of an applied electric field, the alignment of the polymer molecules gives rise to light absorption. Composites: Composites are materials, usually man-made, that are a three-dimensional combination of at least two chemically distinct materials, with a distinct interface separating the components. They are created to obtain properties that cannot be achieved by any of the components acting alone. In composites, one of the materials, called the reinforcing phase, is in the form of fibers, sheets, or particles. This material is embedded in the other materials, called the matrix phase. The reinforcing material and the matrix material can be metal, ceramic, or polymer. Typically, reinforcing materials are strong with low densities while the matrix is usually a ductile, or tough, material. The purpose of the composite, when it is designed and fabricated correctly, is to combine the strength of the reinforcement with the toughness of the matrix to achieve a combination of desirable properties not available in any single conventional material. The downside is that such composites are often more expensive than conventional materials. Some examples of current applications of composites include the diesel piston, brake-shoes and pads, tires and the Beechcraft aircraft in which 100% of the structural components are composites. A structural composite often begins with lay-up of prepreg. At this point, the choice of fiber will influence the basic tensile and compressive strength and stiffness, electrical and thermal conductivity, and thermal expansion of the final pre-preg material. The cost of the composite can also be strongly influenced by the fiber selected. The resin/fiber composite's strength depends primarily on the amount, arrangement and type of fiber (or particle) reinforcement in the resin. Typically, the higher the reinforcement content, the greater the strength. There are also some cases in which glass fibers are combined with other fibers, such as carbon or aramid, to create a hybrid composite that combines the properties of more than one reinforcing material. Additionally, the composite is typically formulated with fillers and additives that change processing or performance parameters. Integrating the ceramic, metallic, plastic and semiconductor materials is a necessary requirement to the fabrication of the micro-electronics package. This is an example of a composite system whose function is to provide interface between the central IC (Integrated Chip) and the other items on, for example, a PCB (printed circuit board). Semiconductors: There is a relatively small group of elements and compounds that has an important electrical property, semi-conduction, which makes them neither good electrical conductors nor good electrical insulators. Instead, their ability to conduct electricity is intermediate. These materials are called semiconductors, and in general, they do not fit into any of the structural materials categories based on atomic bonding. For example, metals are inherently good electrical conductors. Ceramics and polymers (non-metals) are generally poor conductors but good insulators. The semiconducting elements (Si, Ge, and Sn) from column IV of the periodic table serve as a kind of boundary between metallic and nonmetallic elements. Silicon (Si) and germanium (Ge), widely used elemental semiconductors, are outstanding examples of this class of materials. These elemental semiconductors are also known as Mono Semiconductors. Binary semiconductors are formed by a compound of two elements, normally an element from group III combined with an element from group V (such as CdS), or a element from group II combined with an element from group VI (such as GaAs). Tertiary semiconductors are formed by a compound of three elements. These semiconductors are typically compounds of elements from groups I, III and VI (such as AgInS) or elements from groups II, IV and V (such as ZnGeAs). All materials have energy bands in which their electrons can exist. In metals, as stated above, the valence band is partially-filled, and the electrons can move through the material. In semiconductors, on the other hand, there is a band gap that exists, and electrons cannot jump the gap easily at low temperatures. At higher temperatures, more of the semiconductor`s electrons can jump the gap. This causes its conductivity to go up accordingly. Electrical properties can also be changed by doping This too, is one of their great assets. Putting impurities in a semiconductor material can result in two different types of electrical behaviour. These are the so-called n (negative) and p (positive) type materials. Group V elements like arsenic added to a group IV element, such as silicon or germanium, to produce n-type materials. This occurs due to the extra valence electron in group V materials. On the other hand, group III materials like boron produce the p-type because they have only three valence electrons. When n-type material is connected to a p-type material, the device then exhibits diode behaviour. In other words, current can flow in one direction across the interface but not in the other. Diodes can act as rectifiers, but they have also led to the development of the transistor. A bipolar junction transistor (BJT) is a diode with an added third material which creates a second interface. While both npn or pnp types exist, their basic operation is essentially the same as two diodes connected to each other. With proper biasing of the voltages across each diode of the device, large current amplification can be produced. Today, metal oxide semiconductor field effect transistors (MOSFETS) have become widely used and have replaced the BJT in many applications. As a result, millions of transistors can be placed on a single silicon chip or integrated circuit. These IC chips have better reliability and consume less power than the large vacuum tube circuits of the past. The fabrication of electronic devices from the raw materials requires two major steps. The semiconductor is first melted, and a seed crystal is used to draw a large crystal of pure, solid semiconductor from the liquid. Wafers of the semiconductor are sliced and polished. Second, the circuit pattern is etched or deposited using a photolithographic process. The individual chips are finally sectioned from the initial wafer. Semiconductors experience covalent bonding. Their electrons are more tightly bound than the electrons in metals, but much more loosely bound than the electrons in insulators. The atoms in semiconductors are typically arranged in a crystal structure: a diamond-like tetrahedral (in which each atom is bonded to 4 others). Semiconductors are also typically semi-shiny. The intermediate ability of semiconductors to conduct electricity at room temperature makes them very useful for electronic applications. For example, the modern computing industry was made possible by the capability of silicon transistors to act as fast on/off switches. Electronic computing speed has greatly increased with the integrated circuit. For example, the cycle times of today's computers are now measured in nanoseconds. Opto-electronic (laser diode) research is extending the already huge rate at which information can be transmitted. Biomaterials: A biomaterial is any nondrug material that can be used to treat, enhance, or replace any tissue, organ, or function in an organism. The term biomaterial refers to a biologically derived material that is used for its structural rather than its biological properties. It also refers to any material, natural or man-made, that comprises whole or part of a living structure, or biomedical device which performs, augments, or replaces a natural function. A biomaterial can be a metal, ceramic, polymer or composite. They may be distinguished from other materials because they possess a combination of properties, including chemical, mechanical physical and biological properties, which allow them to be suitable for safe, effective and reliable use within a physiological environment. For example, collagen, the protein found in bone and connective tissues, can be used as a cosmetic ingredient. A second example is carbohydrates modified with biotechnological processes that have been used as lubricants for biomedical applications or as bulking agents in food manufacture. The performance of biomaterials depends on material properties, design, biocompatibility, surgical technique, and the health of patient. In particular, biocompatibility relies on the acceptance of the device by the body. Ideally, there should be no irritation, inflammation, or allergic response Both biomaterials and biomechanical expertise are needed to perform in vitro testing of spinal implants. Endo-vascular stents provide structural support vessels following angioplasty and other major medical procedures. After an angioplasty procedure, vessels can experience re-stenosis and eventually return to their original pre-operative diameter. In as many as 10% of the procedures, the vessels may even collapse immediately. To prevent the vessels from shrinking, endo-vascular prosthesis or stents are used. These stents are examples of biomaterials. Stents are tubular structures consisting of a spring, wire mesh or slotted tubes that are deployed inside the vessel. Depending on the design and intended use (coronary/ peripheral), they can range in diameter from several millimeters to many times that size. A biomaterial must be typically have the following properties: it must be inert or specifically interactive, biocompatible, mechanically and chemically stable (or biodegradable), processable (for manufacturability), have good shelf life, be nonthrombogenic (does not cause clot formation) if it is blood-contacting, and be sterilizable. There are examples of biomaterials and compatibility problems which arise from the materials not having the above properties. These include dialysis tubing made of cellulose acetate, a â€Å"commodity plastic†, which is known to activate platelets and blood complement. Additionally, Dacron, a polymer widely used in textiles, has been used in vascular grafts, but only gives occlusion-free service for diameters larger than 6 mm. Finally, commercial grade polyurethanes, initially used in artificial hearts, can be thrombogenic (they cause clot formation). There are many prominent applications of biomaterials used in the medical profession today. Biomaterials are used in orthopedics for joint replacements (hip, knee), bone cements, bone defect fillers, fracture fixation plates, and artificial tendons and ligaments. They are also used for cardiovascular vascular grafts, heart valves, pacemakers, artificial heart and ventricular assist device components, stents, balloons, and blood substitutes. Another application is in ophthalmics, for contact lenses, corneal implants and artificial corneas, and intraocular lenses. They can also have cosmetic applications, such as in augmentation mammoplasty. Finally, other applications include dental implants, cochlear implants, tissue screws and tacks, burn and wound dressings and artificial skin, tissue adhesives and sealants, drug-delivery systems, matrices for cell encapsulation and tissue engineering, and sutures. 2). The following paragraphs will provide an analysis of the modern pop can and the considerations taken by the manufacturer in its design. The overall design of the can has several advantages over another popular beverage container, the glass bottle. The pop can is inherently light weight and cheap due to the aluminum or steel alloys that are used in its creation. The cost of a can accounts for only about 4 cents of the price of a canned beverage. About 10 cents goes for advertising. The 12 ounces of beverage in the container typically costs less than a penny to produce. It is also not easily breakable, unlike glass. The shape of the can is easy to hold in the hand, making it much easier for a customer to use. The aluminum or steel alloys of the can also have the ability to undergo expansion without breaking the container. Thus, if a pop can is frozen, it will not explode, it will simply deform. Glass, on the other hand, would not as easily deform and would likely break in this situation. Pop cans are also allow cheaper packaging methods than bottles to be used. This is because the cans can come into contact with each other without breaking, unlike bottles. This allows many cans to be transported without the need for extensive protective barriers between the individual cans. An additional feature that allows the cans to be more easily transported and organised is the shape of the bottom and top of the can. Both the bottom and top have a lip. This lip protrudes upward from the top and downwards from the bottom. In other words, there is a indentation in both the top and bottom of the can, as shown in the following figure: The radii of the top and bottom lips are matched so that one can is able to be stacked on top of another can. In other words, the top lip of one can fits neatly into the bottom lip of the second can. This is shown in the following diagram. This stacking feature is not possible with bottles, since the bottom base of a bottle does not resemble its top spout. The pop-top soda, with their attached tab, can provide an excellent example of inherently safer design from everyday life. When soda in cans was first introduced, a separate device was required to open these cans, and the first â€Å"pop-tops† represented a major advance in convenience (and environmentalism). The initial pop-tops were scored tear strips in the can top with attached rings or levers to grasp and tear the metal tab from the can. The top was completely removed from the can once the tab was opened, and this top was then discarded. These tabs were therefore environmental hazards when discarded. Alternatively, some people would dispose of the tab by placing it into the can before drinking the soda. This caused the tab to occasionally be swallowed when drinking from the can, so it sometimes had to be surgically removed. The current design of the pop-top soda can, where the tab remains an integral part of the can after opening, represents an inherently safer design. While the tab can be detached by flexing it back and forth until the metal fails, this requires some additional effort to do. It is therefore easier to use the can safely. The procedure involved in creating pop cans will now be outlined. This procedure demonstrates some of the major components of the cans. Modern pop cans are made from either steel or aluminium using advanced engineering and sophisticated technology. There is a special grade of low-carbon steel is used for steel drink cans, which is coated on each side with a very thin layer of tin. This tin allows the surface to be protected against corrosion. It also acts as a lubricant while the can is being formed. In aluminium cans, the aluminium is alloyed with magnese and magnesium, providing greater strength and ductility. Aluminium alloys of different strengths and thickness are used for making the can body and the end. The reason that the alloy used from the end must be stronger than that used for the body will be described shortly. The steps involved in manufacturing cans are illustrated in a simplified way below: The aluminium or steel strip arrives at the can manufacturing plant in huge coils. A thin film of oil is then used to lubricate the strip. The strip is then fed continuously through a cupping press that blanks and draws thousands of shallow cups every minute. Each cup is pressed through a set of tungsten carbide rings. This ironing process redraws and literally thins and raises the walls of the cans into their final can shape. Trimmers are then used to remove the surplus irregular edge and cut each can to a precise, specific height. The excess can material is recycled. These trimmed can bodies are passed through highly efficient washers. They are then dried. As a result, all traces of oil are removed in preparation for coating internally and externally. The clean cans are coated externally with a clear or pigment base coat. This coat provides a good surface for the printing inks. The cans are then passed through a hot air oven to dry the lacquer onto the surface. Next, a highly sophisticated printer/decorator applies the printed design in up to six colours. A varnish is also applied. 9.A coat of varnish is also applied to the base of each can by a rim-coater. 10.The cans pass through a second oven which dries the inks and varnish. 11.The inside of each can is sprayed with lacquer. This special layer is to protect the can itself from corrosion and its contents from any possibility of interaction with the metal. 12.Once again, lacquered internal and external surfaces are dried in an oven. 13.The cans are passed through a necker/flanger. Here the diameter of the wall is reduced or ‘necked-in'. The top of the can is flanged outwards to accept the end once the can has been filled. 14.Every can is tested at each stage of manufacture. At the final stage it passes through a light tester which automatically rejects any cans with pinholes or fractures. 15.The finished can bodies are then transferred to the warehouse to be automatically palletised before dispatch to filling plant. The Can End 1.Can end manufacture begins with a coil of special alloy aluminum sheet. 2.The sheet is fed through a press which stamps out thousands of ends every minute. 3.At the same stage the edges are curled. 4.The newly formed ends are passed through a lining machine which applies a very precise bead of compound sealant around the inside of the curl. 5.A video inspection system checks the ends to ensure they are perfect. TAB.The pull tabs are made from a narrow width coil of aluminum. The strip is first pierced and cut and the tab is formed in two further stages before being joined to the can end. 6.The ends pass through a series of dies which score them and attach the tabs, which are fed in from a separate source. 7.The final product is the retained ring pull end. 8.The finished ends, ready for capping the filled cans, are packaged in paper sleeves and palletised for shipment to the can filler. As mentioned above, a printer/decorator is used in the manufacturing of cans to apply a printed design in up to six colours to the can body. A varnish is then applied. A varnish is a viscid liquid, consisting of a solution of resinous matter in an oil, or a volatile liquid, typically laid on work with a brush. Once it is applied, the varnish soon dries, either by evaporation or chemical action, and the resinous part forms thus a smooth, hard surface, with a beautiful gloss, capable of resisting, to a greater or less degree, the influences of air and moisture. The varnish therefore improves the appearance of the printed design on the can. It also increases the durability of the design by ensuring that it is more resistant to the wearing effects of the elements. This can be readily observed through common experience. Even old, used pop cans retain their printed designs very well, despite being subjected to the elements such as moisture or air. Bottles, on the other hand, typically have paper labels attached with glue. This requires glue and paper. These bottle labels also do not possess the glossy sheen of the pop can design. Finally, they are more easily susceptible to the influences of the elements, particularly air and moisture. For example, placing a glass bottle and its label in water will cause the label to saturate with water. This degrades the legibility and appearance of the label, and greatly increases the chance that it will tear or fall off the bottle. In contrast, placing a pop can in water has no effect on the legibility, appearance, or durability of the printed design. The base-coater gives the can an exterior coat to enable the printing colours to fix properly (the base coat is sometimes The of the pop can is a separate piece to allow filling by the beverage maker prior to the top being installed. It can now be revealed why bottled beer and beer from a tap tastes different from beer in a can. Be forewarned: if you're a six-pack enthusiast, you're not going to like the explanation. When you sip a can of your favorite brew, you are savoring not only fermented grain and hops but just a hint of the same preservative that kept the frog you dissected in 10th-grade biology class lily-pad fresh: formaldehyde. What is formaldehyde doing in beer? The same thing it's doing in pop and other food and drink packaged in steel and aluminum cans: killing bacteria. But not the bacteria in the drink, the bacteria that attacks a lubricant used in the manufacture of the can. Notre Dame's Steven R. Schmid, associate professor of aerospace and mechanical engineering, is an expert in tribology – the study of friction, wear and the lubrication – applied to manufacturing and machine design. The co-author of two textbooks, Fundamentals of Machine Elements and Manufacturing Engineering and Technology (considered the bible of manufacturing engineering), Schmid has conducted extensive research on the manufacturing processes used in the production of beverage and other kinds of cans. Schmid explains that back in the 1940s, when brewers and other beverage makers began putting drinks in steel (and, later, aluminum) cans, the can makers added formaldehyde to a milk-like mixture of 95 percent water and 5 percent oil that's employed in the can manufacturing process. The mixture, called an emulsion, bathes the can material and the can-shaping tooling, cooling and lubricating both. Additives in the oil part are certain bacteria's favorite food. But if the bacteria eat the emulsion, it won't work as a lubricant anymore. So can makers add a biocide to the emulsion to kill the bacteria. Before a can is filled and the top attached, this emulsion is rinsed off, but a small residue of the oil-water mixture is inevitably left behind, including trace amounts of the biocide. The amounts remaining are not enough to be a health hazard, but they are enough to taste, and the first biocide used back in the 1940s was formaldehyde. In the decades since, can makers have devised new formulas for emulsions, always with an eye toward making them more effective, more environmentally friendly and less costly. But because formaldehyde was in the original recipe, people got used to their canned Budweiser or whatever having a hint of the famous preservative's flavor. For this reason, Schmid says, every new emulsion formula since then has had to be made to taste like formaldehyde, â€Å"or else people aren't going to accept it.† Extensive tests are run to make sure the lubricant and additives taste like formaldehyde. â€Å"It's not that it tastes okay. It's just what people are used to tasting,† he says. (Miller Genuine Draft and similar brews, Schmid says, use biocides that have no flavor.) The formaldehyde flavor legacy is one little-known aspect of can-making. Another involves the smooth coating applied to the inside of cans. The rinse cycle that attempts to wash off the emulsion also aims to remove particulate metal debris that forms on the metal's surface during the bending and shaping of a can. Like the emulsion, some of the microscopic debris always remains after rinsing. Unlike the emulsion, it can be dangerous to swallow. To keep powdered metal out of a can's contents, Schmid says, manufacturers spray-coat the inside with a polymer dissolved in a solvent. When the can is heated, the solvent boils away, leaving only the protective polymer coating. The coating not only plasters any microscopic debris to the can wall and away from the food, it keeps the food from interacting with can material, an especially important consideration with steel cans. â€Å"Say you've got tomato soup in this steel can. You don't want that acidic soup corroding your can. It would kill your can, and the can would adulterate your food,† Schmid says. â€Å"It's also why you're advised that when you go camping and you have Spaghettios you don't cook them in the can, because the polymer will degrade and you're going to be eating polymer.† (Industry sources tell Schmid that the typical consequences of such a culinary blunder are headaches and constipation.) Schmid says can manufacturers are forever searching for ways to improve efficiency in their struggle to stay price competitive with plastic and glass bottles. A single can-tooling machine can form 400 cans a minute. In a typical process, all but the top is shaped during a single stroke through a disk of aluminum or steel. The top, seamed on after filling, is made of a more expensive aluminum alloy, rich in magnesium. The added ductile strength of the magnesium is necessary so another machine can mash down a pillar of the metal to form the rivet that attaches the pop top. Today's beverage cans are â€Å"necked† near the top for a reason. The narrower-diameter means less of the expensive lid alloy is needed. It saves a minuscule fraction of a cent per can, but it adds up, Schmid says. â€Å"In this country alone we use about a can per person per day, so you have to make 250 million cans per day. It's an amazing thing to watch these machines kick out these cans.† Rivet is likely a separate part from the tab. It should be strong enough to attach the tab to the can and to ensure that it does not break when the can is opened. Lip on top of can prevents liquid from flowing down the side of the can. Bottom is indented to enable stacking even when the tab has been opened. The indent provides the necessary room for the open tab. For recycling purposes, pop cans can be neatly compacted flat, and are easy to transport using a wide range of containers. Rivet is a separate piece which connects the tab to the can top. Top of the pop can is stamped with words such as â€Å"recyclable† and â€Å"return for refund†. Thus, the alloy of the top must be soft enough to allow this stamping to occur. Aluminum costs more than steel, and the price has been rising. Steel â€Å"minimills† now have continuous casting processes that make sheet steel thin enough to form seamless cans. And there is competition from other materials as well. â€Å"We h ave to find ways to make cans lighter and lighter to keep fending off polymers, steel and glass. Lighter cans means lower prices to the consumer, who's then more likely to buy cans off the grocery shelf instead of two-liter bottles or glass.† ALCOA's answer is lightweighting, designing cans to use the thinnest aluminum possible within the constraints of strength and appearance. In 1993, Americans recycled 59.5 billion aluminum cans, 3 billion more than in 1991, and raised the national aluminum can recycling rate to 2 out of every 3 cans. Aluminum can recycling saves 95% of the energy needed to make aluminum from bauxite ore. Energy savings in 1993 alone were enough to light a city the size of Pittsburgh for 6 years. Special pallets and stacking techniques are used to protect can bodies from crushing stresses and to enable quick and efficient loading into the filling machine line. The first beverage can, filled by a brewer in Newark, New Jersey in 1935, weighed three ounces. Today, an aluminum beverage can weighs one half ounce – 600% less than the original beverage can. Can manufacturers strive to do even better through a process called â€Å"light weighting†-the use of lighter can ends and thinner body walls. Using less material at the beginning of the manufacturing process results in a more effective means of creating safe, reliable, performance-driven packaging. This results in less waste once the packages' contents have been consumed. It also saves manufacturers money – an added incentive. 3). The diameter of the bar is 12.7 mm. Its radius is half the diameter. Therefore, its radius can be calculated to be (12.7 mm)/ 2 = 6.35 mm. By applying the conversion factor that 1000 mm = 1 m, this radius can also be expressed as (6.35 mm) * (1 m / 1000 mm) = 6.35 x 10-3 m. The bar has a cross-sectional area given by the following formula: Cross-sectional area = ?r2 where r is the radius of the steel bar. Using this formula, the cross-sectional area of the bar can be calculated to be: Cross-sectional area = ?(6.35 x 10-3 m)2 Cross-sectional area = 1.266768698 x 10-4 m2 (Cross-sectional area = 1.27 x 10-4 m2 when significant figures are applied). Gravity applies a force to the bar proportional to the bar's mass. This force is given by the formula: Force due to Gravity = (Mass of object) * (Acceleration of Gravity) If we assume that the steel bar is located at the surface of the earth, the acceleration of gravity is approximately 9.8 m/s2 at this elevation. Therefore, the force applied to the bar by gravity can be calculated to be: Force due to Gravity = (7000 kg) * (9.8 m/s2) Force due to Gravity = 68600 kg*m/s2 (Force due to Gravity = 70000 kg*m/s2 when significant figures are applied) The stress placed on the bar is given by the following formula: Stress = (force) / (unit area) Therefore, the stress placed on the bar can be calculated to be: Stress = (68600 kg*m/s2) / (1.266768698 x 10-4 m2) Stress = 541535326.2 kg/(m*s2) (Stress = 500000000 kg/(m*s2) when significant figures are applied) The steel bar has a modulus of elasticity of 205,000 Mpa. 1 Pa is defined to be equal to 1 kg/(m*s2). Using the conversion factor that 1 x 106 Pa = 1 Mpa, 1 Mpa is defined to be equal to 1 x 106 kg/(m*s2). We can therefore express the modulus of elasticity of the steel bar in Pa as (205,000 Mpa) * (1 x 106 Pa / 1 Mpa) = 2.05 x 1012 Pa. The strain experienced by the steel bar is the fractional deformation it undergoes when a stress is applied. This strain can be represented mathematically by the following formula: where l represents the length of bar, and ?l represents the change in length of the bar due to the applied stress. The elastic region of the stress-strain curve refers to the portion of the curve in which an increase in stress will cause a linearly proportional increase in strain. Within this elastic region, removal of the stress will cause the strain to be reduced to zero as well. In other words, the material is not permanently deformed, and removal of the stress causes the material to return to its original dimensions. The strain is therefore reversible, or elastic. In the elastic region, therefore, stress and strain can be related by a proportionality coefficient. This proportionality coefficient relating the reversible strain to stress in the elastic region of the stress-strain curve is known as the modulus of elasticity. This modulus of elasticity can be represented mathematically as: Modulus of Elasticity = (Elastic Stress) / (Unit Strain) This equation can be rearranged to solve for the unit strain. This rearranged equation is expressed as: Unit Strain = (Elastic Stress) / (Modulus of Elasticity) Assuming the stress applied to the bar is small enough to ensure that the bar is still operating in the elastic region of the stress-strain curve, we can use the above equation to determine how much the bar will be strained by the load. Mathematically, this solution takes the following form: Unit Strain = (541535326.2 kg/(m*s2)) / (2.05 x 1012 Pa) Unit Strain = (541535326.2 kg/(m*s2)) / (2.05 x 1012 kg/(m*s2)) Unit Strain = 2.641635738 x 10-4 (Unit Strain = 3 x 10-4 when significant figures are applied) This strain is unitless because it represents the fractional deformation of the bar when the stress is applied.