Superconductor Definition, Types, and Uses

Superconductor Definition, Types, and Uses A superconductor is an element or metallic alloy which, when cooled below a certain threshold temperature, the material  dramatically loses all electrical resistance. In principle, superconductors can allow electrical current to flow without any energy loss (although, in practice, an ideal superconductor is very hard to produce). This type of current is called a supercurrent. The threshold temperature below which a material transitions into a superconductor state is designated as Tc, which stands for critical temperature. Not all materials turn into superconductors, and the materials that do each have their own value of Tc. Types of Superconductors Type I superconductors act as conductors at room temperature, but when cooled below Tc, the molecular motion within the material reduces enough that the flow of current can move unimpeded.Type 2 superconductors are not particularly good conductors at room temperature, the transition to a superconductor state is more gradual than Type 1 superconductors. The mechanism and physical basis for this change in state is not, at present, fully understood. Type 2 superconductors are typically metallic compounds and alloys. Discovery of the Superconductor Superconductivity was first discovered in 1911 when mercury was cooled to approximately 4 degrees Kelvin by Dutch physicist Heike Kamerlingh Onnes, which earned him the 1913 Nobel Prize in physics. In the years since, this field has greatly expanded and many other forms of superconductors have been discovered, including Type 2 superconductors in the 1930s. The basic theory of superconductivity, BCS Theory, earned the scientists- John Bardeen, Leon Cooper, and John Schrieffer- the 1972 Nobel Prize in physics. A portion of the 1973 Nobel Prize in physics went to Brian Josephson, also for work with superconductivity. In January 1986, Karl Muller and Johannes Bednorz made a discovery that revolutionized how scientists thought of superconductors. Prior to this point, the understanding was that superconductivity manifested only when cooled to  near  absolute zero, but using an oxide of barium, lanthanum, and copper, they found that it became a superconductor at approximately 40 degrees Kelvin. This initiated a race to discover materials that functioned as superconductors at much higher temperatures. In the decades since, the highest temperatures that had been reached were about 133 degrees Kelvin (though you could get up to 164 degrees Kelvin if you applied a high pressure). In August 2015, a paper published in the journal Nature  reported the discovery of superconductivity at a temperature of 203 degrees Kelvin when under high pressure. Applications of Superconductors Superconductors are used in a variety of applications, but most notably within the structure of the Large Hadron Collider. The tunnels that contain the beams of charged particles are surrounded by tubes containing powerful superconductors. The supercurrents that flow through the superconductors generate an intense magnetic field, through electromagnetic induction, that can be used to accelerate and direct the team as desired. In addition, superconductors exhibit the  Meissner effect  in which they cancel all magnetic flux inside the material, becoming perfectly diamagnetic (discovered in 1933). In this case, the magnetic field lines actually travel around the cooled superconductor. It is this property of  superconductors  which is frequently used in magnetic levitation experiments, such as the quantum locking seen in quantum levitation. In other words, if  Back to the Future  style hoverboards ever become a reality. In a less mundane application, superconductors play a role in modern advancements in magnetic levitation trains, which provide a powerful possibility for high-speed public transport that is based on electricity (which can be generated using renewable energy) in contrast to non-renewable current options like airplanes, cars, and coal-powered trains. Edited by Anne Marie Helmenstine, Ph.D.

Term Paper Outline

Term Paper Outline This article will help you get more knowledge on how to write a term paper outline. Writing a term paper outline is the first thing you have to do as soon as you sit down and decide to write your own term paper. The term paper outline defines the things you are about to discuss in your term paper, and how the term paper will come out in whole. When writing a term paper outline you have to seize the whole amount of information you would like to include in your term paper, and structure it the way it would make most effect on the reader. The term paper outline must be written on a clear peace of paper, and with great distinctiveness, as a messy term paper outline can only confuse you, and make you not want to use it. Before sitting down to write the term paper outline you have to complete a procedure named brainstorming. Brainstorming helps you write a good term paper outline, and cover all the points of your term paper outline. Brainstorming is a specific way of thinking, when you think of all the points you would like to mention in your paper. However, this method does not require structuring. You can think first of the ways you would like to end your term paper, and then, think of the introduction whatsoever. This method helps you add some thoughts that were hidden when you simply were thinking of the term paper without brainstorming. After you have completed the brainstorming process, you may start to structure your information. A good way to do that is a method called branching. This is a sort of a diagram, where you draw a tree with branches. Every branch is a thought, connected to a parent thought, which is connected to the trunk of the tree. If you have no idea how to outline a term paper, you may need a sample term paper outline or term paper example, which will help you see how a proper term paper outline is supposed to be done. You may also order a custom term paper outline, and see how an experienced writer sees this term paper, and afterwards use it as your own term paper outline and write a term paper according that outline. If the term paper outline sample doesnt work for you, you might want to consider a term paper outline help. You can ask a proficient writer to help you do your term paper outline, or help with the term paper outline format. The term paper outline format is also a very important part, as there are various formats, which can be used in your term paper outline. It can be either an MLA term paper outline or an APA term paper outline. These formats differ from each other, and it is best for you to be proficient in both of these term paper outline formats. When writing a term paper outline never forget that it will result your term paper in whole. Try to be maximum accurate with your term paper outline and make sure you write it with maximum details, and not forget anything.

Art Leonardo Essay Example | Topics and Well Written Essays - 250 words

Art Leonardo - Essay Example Notably, the portrait reflects an emotion wave that sweeps through the apostles regarding Christ’s statement. Actually, the photo practically portrays an expected scene. The statement, from Christ is reflected by the art as triggering independent reaction among the apostles. This scene is displayed by the portrait, which shows more actual drama expected in the real scene. Furthermore, Christ’s head is placed centrally in the architect and the frame depicts an architectural opening that seems to be â€Å"halo like†. Through these scenes, the photos clearly depict an expectation that is surprising to the apostles. The disappearing head of Christ form a perspectival projection that gives the portrait a more architectural setting coverage. Judas, being the betrayer is separated out of the rest to emphasize the lack of â€Å"unity† between him and the rest of the disciples. Generally, the photos communicate a lot of issues, which relate to what actually transpired during the last supper (Da Vinci & Cremante 209). Leonardo paintings are oriented more to religion, which classically reflect the fading face of the ancient Christianity. These features and architect are not only with Leonardo, but also with other ancient artists. Leonardo’s architects, portray the church as a building of uniform interior that formed the structure of all other Christian churches. Leonardo, through his art, aimed at bringing the humanity and nature together. Leonardo, combined both Christian and classical elements in a symmetric plan, in an attempt to synthesize on knowledge and tradition in a more harmonious and natural way. In conclusion, many scholars have tried to conceptualize Leonardo’s techniques of painting (Da Vinci & Cremante

Business Essay Example | Topics and Well Written Essays - 250 words - 25

Business - Essay Example The employees working in the campus has the facility that they can have free food any time they want, they can give their clothes for dry cleaning and can use the gym in order to maintain their health (Emerson, 2012). The employees have the facility that they can work on their own idea in the 20% of the time that is allocated for them to become innovative and do whatever they want so that they can expand as well. Google allows the employees to take leave for a year or two without being paid, but this way they can try to launch their own idea (Emerson, 2012). The company gives all the employees special attention and apart of basic benefits, some other benefits are also given to the employees that are on-site medical facility, Japanese washrooms, swimming pools, conference bike, free haircut, ball pits etc (Emerson, 2012) . Emerson, R. (2012, January 31). Googles Best Benefits: The Top 7 Perks Google Offers Employees. Retrieved June 30, 2012, from http://www.huffingtonpost.com:

The Cold War and U.S. Diplomacy Essay Example | Topics and Well Written Essays - 1000 words - 9

The Cold War and U.S. Diplomacy - Essay Example the United States was in no way susceptible, but it had the task of defending its partners as well as bring to a stop the development of nuclear armaments (Ambrose, 1989). President Nixon had the same ideas and he based his goals in ensuring world peace is maintained. After his election into office, there was an increase from American citizens for American troops to be sent back home from foreign missions. Nixon promised American citizens that he will support American allies with resources but not man power. However, the process was delayed as protests became a daily scene in the streets on the United States. In providing a specific case scenario, the number of American troops who died in Vietnam reached 500, 000 (Dallek, 2007). This made citizens even more irritated by Nixon’s regime. Nixon however, launched vietnamisation which was a strategy to pull out American troops in the region, help build a Vietnamese military squad and provide them with weapons and financial resources. He succeeded in this particular quest as he was applauded for successfully ensuring peace in Vietnam and getting American troops back home. Nixon took over American during a time when the nations had a lot of enemies in terms of diplomatic relations. However, the nations also had significant allies Nixon was keen to retain (Ambrose, 1989). On many occasions involving warfare, Nixon was forced to use diplomatic efforts to be able to come up with lasting solutions. For instance, during the invasion of Arab countries in Israel, Nixon realized the significance of having good diplomatic relationships with the Arab countries (Dallek, 2007). Nixon was able to negotiate with Egypt and he convinced them to pull out in the war against Israel. Additionally, Nixon also used diplomatic efforts to solve the China-Pakistan war. In this occasion, Pakistan is an American ally and China a great ally to the Soviet. According to Parmet (1990) the diplomatic relationship between the Soviet and the United

Human Resource Management Term Paper Example | Topics and Well Written Essays - 1000 words

Human Resource Management - Term Paper Example Recommending a termination would for instance require a replacement and this means a costly recruitment process. It would also have financial repercussions, would affect other employees in the region and ultimately the company’s culture. It is therefore a particularly difficult decision to make but then a decision must be reached and one that serves the best interests of the business. It must be just and sufficient considering employment and labour laws. Gordo has been tolerated for a very long time and for this reason his behaviour has continued to determinate up the current level where he appears not to uphold company values any more. Considering the company’s PCP, Gordo’s unpleasant behaviour has already been discussed verbally in his presence and a written warning issued but he did not show any significant effort to turn things around. He appeared to continue with a careless attitude and would always give reasons for his financial underperformance hence a probation was necessary. Probation would also serve as a good notice to him that the company is concerned with his performance and therefore requires of him to improve or face dismissal. The situation got worse with the latest discovery touching on lack of professionalism. He has lost two important accounts; this has significant implications to the market share, business and growth and financial performance of the company. There have also been cases of customer complains on his conduct. He fails to respond to customer calls and more importantly a physician complained that he had attempted to convert what was company business to his personal business. Gordo now has the courage to discourage a customer against the company and offer to repair their machine at a cheaper price if paid in cash. This has actually crossed the lines in terms of professional conduct; such behaviour can never be allowed by any company

Twilight Saga-Summary Essay Example for Free

Twilight Saga-Summary Essay Twilight is a series of novels which starts out in the perspective of a seventeen year-old girl, Isabella Swan. But she goes by Bella. This story is actually set in the fictional vampire stories. Bella, the main character of the novel, unwillingly decides to live with her dad, Charlie, in Forks, Washington since her mother, Renà ©e, and her husband, Phil, who happens to be Bella’s step-father, move in to another city on business. Phil is a minor league baseball player, and he gets transferred to another team in another city. The main reason that makes Bella move in with her dad, is that she thinks she is keeping her mom from going places with Phil. Before moving to Forks, she almost lived the whole 17 years of her life, in sunny Phoenix, Arizona beside her mom. Bella is a simple, clumsy, skinny, ivory-skinned girl. Although she didn’t relate well to people, she had a friend in Forks, named Jacob Black. They have known each other since they were little . Before arriving at Forks, her dad bought her an old Chevy truck from Billy Black, and had already registered her to a high school there in Forks. She doesnt expect anything to change because what could happen in a small town where it never stops raining? But in fact, she was totally wrong. On her first day of school she meets a few people. Later on she meets Mike Newton, Erik Yorkey, Jessica, Angela Weber, and Tyler. She was actually befriended by several students. She asked Jessica a heck of questions about everything in order to find out more about the school and people living in Forks, soon after they got friends. After a few days, when she was sitting in the cafeteria with her classmates, she noticed a bunch of unusually gorgeous people sitting at the corner of the cafeteria. They were Alice, Emmet, Jasper, Rosalie, and Edward Cullen ( the most beautiful of all ). The children of Dr. Cullen. They were all vampires. she couldnt help staring at them. As soon as she laid her eyes on Edward Cullen, her life changed completely. She fell in love with Edward. At first she tries to avoid Edward, and acts as if he is annoying, but really she is burning inside to get to know him. In biology she was told to sit alongside Edward, since there were no free seats left. Because the Cullens are vampires, and so is Edward, he tries to avoid her every single time they face each other, mostly in a rude manner. After a week of being absent from the school, Edward comes to biology class, and apologize Bella for his rude  and cruel behavior. Then they become friends with each other. One day when Bella was standing beside her truck, trying to get in it, she noticed Edward standing near his Volvo, staring at her. All of a sudden, she discerns that having lost its control, a car is heading towards her, and is about to hit her. Despite Edward’s distance from the accident, he instantaneously puts his body in front of Bella, trying to save her. To her intense surprise, Edward stopped the car by his hand, without even having a little scratch or scar on his body. Tyler, the kid who almost crashed into Bella, apologized her. This specific event was more than enough to make Bella much more curious about the Cullens. Specially about Edward. Thanks to Edward, they both survived. Bella went to hospital with minor injuries. When Edward came to see her in the hospital, he tried to convince her that she was just imagining his supernatural speed and strength. But she wasn’t convinced and began to wonder who or what he is. Bella becomes determined to find out how Edward saved her life, and constantly pesters him with questions. That was the very first night that Bella dreamed of Edward. Later on, every time she asked him about that day, he refused to talk more about it. Bella’s science class is doing blood typing, which requires all the kids to draw blood. Edward skips class. Bella feels faint and has to go to see the school nurse. Mike is helping her but then Edward turns up and takes over. Bella starts quizzing Edward about his background and tries to guess what he is but she’s still a long way off. Jacob tells her the local tribal legends, when they were in a beach in La Push with a few of her friends. According to the legend, werewolves are the one true enemy of vampires and the Cullens are a family of vampires who, unlike most of their kind, abstain from drinking human blood. Thats the only reason why the werewolves of La Push have allowed them to live in Forks. She looks up vampires on the Internet. Bella concludes that Edward and his family are vampires who drink animal blood rather than human. Even though Edward tells her to stay away, she still tries to talk to him in school, and finds any excuse she can to be near him. Edward confesses that he initially avoided Bella because the scent of her blood was too desirable to him. Edward and Bella fight the attraction they feel for each other before finally giving into their feelings and falling deeply in love in the exact meaning of the word. As far as the school prom was just a few weeks  later, Mike and Tyler both asked Bella to the school dance, much to her embarrassment. She decided to go to Seattle the weekend of the dance s o this way, she had an excuse to turn them both down. Edward was actually bemused by all the attention Bella was getting. When he heard her plans, he asked if he could go to Seattle with her, despite his earlier recommendation that they should keep a distance from each other. Bella accepted his offer with great excitement. She makes plans to go to Port Angeles with two of her friends to help them look for dresses to wear at the school dance. In Port Angeles, Bella goes shopping with her friends and then decides to go for a walk. A group of men chase her and are about to attack her when Edward pulls around the corner in his Volvo and drives her away. The two of them go for dinner together. Edward confirms to Bella that he is a vampire and reveals that he can hear people’s thoughts. Bella and Edward continue their conversation, with Bella asking more questions about Edward’s vampire state. She tells him it doesn’t matter to her if he’s a vampire and finally admits to herself that she is in love with him Their love and relationship strengthens, but not everyone is happy about th e relationship between Edward and Bella. Edward’s family is against this relationship. The Blacks don’t seem happy either. On the other hand, Bella’s classmates seem awestruck by their relationship as the two of them become inseparable. Edward tries to convince Bella how much he cares about her. He finds it frustrating not to be able to hear her thoughts, while he can hear everybody else’s, and thinks she’s taking the whole vampire thing way too calmly. He suggests a mystery trip in place of the planned visit to Seattle so he can show her, what happens when he goes in the sun, just to threaten her and make her keep away from him, since he may be a threat for Bella’s life. This time it’s Edward’s turn to ask Bella question after question, though she can’t understand how he can find her human life interesting. He is still not sure if he can be alone with her without hurting her. Hes afraid of being overwhelmed by his desire for her blood. But Bella’s determined to take the risk, as long as, she is besotted with him. He admits to Bella that when he first saw – or rather smelt – her, he had to fight the urge to drink her blood because it’s so alluring to him. Then He carries her from the meadow to her truck on his back, running so fast that it makes her feel queasy, and they kiss for the first time. When Edward realizes Bella’s feelings about  him, his feeling of love toward her expands. Edward tells Bella again, that his family is having trouble accepting their relationship because shes not one of them (vampires). As long as Bella is curious about him, she asks more about his past and childhood so as to get to know him more. Edward tells her that he was turned into vampire by his father, when he was about 17, back in 1918 and continues to tell more about his past The Cullens have different supernatural powers, each more ex traordinary than the other. His sister Alice, foe example, has the gift of premonition. Jasper, can manipulate the emotions of those around him. One day, Edward sneaks into Bella’s bedroom without Bella and her father knowing about it. They spend the whole night together talking to each other. He tells her that he finds her very attractive, but he can’t be so close to her, he might crush her by accident. He confirms that, it is not because he doesn’t love her anymore. He tells her that it’s his instinctive vampire habits, that makes him that much worried about being close to her. Despite the fact that, his family is a little upset about his decision, Edward decides to introduce Bella to his family, since he is really serious about her. They spend the whole day at the Cullen house so she can get to know the family, one day she may be living with. Carlisle and Esme, and Edward’s sister Alice are very nice to her. But Edward says his sister Rosalie, is jealous of her because she’s human. Later that day, Edward plays the piano for Bella, and shows her around the house. To her surprise, he tells her the story of Carlisle, who was a minister’s son until he discovered a coven of vampires. One of the vampires bit him, which made him transform into a vampire. Carlisle tried several ways to kill himself but failed, as it’s very difficult to kill a vampire, he suffered a lot. He has never wanted to harm any human being . Once Carlisle discovered that he could survive on animal blood alone, he went to Italy to study medicine so he could do some good in the world. It was while working as a doctor that Carlisle discovered Edward and transformed him into a vampire. Edward stayed with Carlisle for a while but went his own way for about ten years. In that period, he hunted human but only those intent on committing a violent crime, which Edward used his mind-reading skills to decipher. As far as the Blacks are wolves, according to the legend, they are number one enemies of vampires and vice versa, Billy tells Bella to stay away from the Cullens. But Bella replies  that she knows exactly what he is, and that he hasn’t harmed anyone. Days after, Bella introduces Edward to her father as her boyfriend. One day Edward suggests her to come over and see their baseball match, which is played among their family. During the game Bella joins them and finds it really hard to keep up with their pace, since vampires are all very fast in an extraordinary way. The game is actually much faster than a human version of it. All of a sudden, Alice foresees the imminent arrival of a pack of vampires that are passing through the area. The sad part is, that they are not the good kind. They drink human blood. The clock is ticking and they hardly have enough time to take Bella away from them, so they all decide to act like she’s one of them, with the hope of surviving. The visiting vampires are Laurent, James and Victoria. Laurent seems to be the leader of the pack. At first they seem like, they are interested in visiting the home of the Cullens and promise not to hunt in their territory. The direction of the wind changes, they smell Bella’s scent and find out that she is a human. On the spur of the moment, James seems eager to attack her, but Edward jumps in front of her in a protective stance. Laurent, though surprised by the presence of a human, assures the Cullens that none of them will harm her. However, that night Edward reveals to Bella that he knows, from listening to Jamess thoughts, that James is an expert tracker and is intent on hunting Bella. He agrees to take Bella home so she can tell her dad she’s going to Phoenix, where her mother lives. Bella pretends to break up with Edward in front of Charlie and storms out of the house, telling him she hates Forks and is moving back to Phoenix. Edward takes Bella to their house while Laurent is still in their house. He confesses that James is the real leader of the pack and one of the most dangerous vampires he’s ever known in his life. They know that he’ll kill Bella at all costs and in anyway possible. The first thing the Cullens have to do is to kill James first. Edward, Carlisle and Emmet plan to hunt him while Bella hides out in a hotel room in Phoenix with Alice and Jasper. This, somehow shows their good tenor. Bella wakes up in a hotel room in Phoenix with Alice and Jasper watching her every move. They assure her that the other members of the Cullen family are safe but she can’t stop worrying about them, especially about Edward. In the hotel room, Alice explains  that vampires can turn humans into vampires by injecting them with their venom. She points out that the transformation is excruciating and usually takes a few days. Edward has lost track of James. Alice has a vision of James sitting alone in a mirrored room, which Bella realizes is similar to the dance studio she used to go to when she was younger. This, is around the corner from her mother’s house. Alice has another premonition and this time sees James at the house of Bella’s mum. Bella is distraught. She is getting ready to go to the airport to meet Edward when she gets a phone call from James. He tells her that he has her mother and will kill her if she doesn’t get away from the Cullens and come to her mother’s house alone. Bella writes a letter to Edward telling him that she loves him and asking him not to go after James for killing her. Bella gets a cab to her mother’s house. James tells her on the phone to go to the dance studio. When she arrives there, she finds out that he’s taken a video from her house and used it to trick her into believing he had her mother. Knowing that her mother is safe, she is relieved. He promises her a slow and agonizing death. He attacks her, slashing her face and breaking her leg, until she finally passes out. Bella puts her mother’s safety before her own and almost dies at the hands of a vicious vampire. After returning to consciousness, she tells Edward that she feels strange. They realize that James has bitten her and she is about to transform into a vampire. Edward sucks the dirty venom out in order to prevent her from having to spend the rest of her life, being a vampire. Bella opens her eyes in a hospital, and sees Edward. Even though he understands her decision of going to James alone, he gets mad at her first. He punishes her by saying to her that they have to go their own ways, and should end their relationship. Edward tries to accept her, the fact that she would be much safer without him. He tells her that the more they are together, the more her life will be at stake. He actually blames himself for all that had happened to Bella, since he loves her more than anything, and wants what’s best for her. Hearing all these from Edward, Bella tries to make him promise that he will never leave her. As long as Bella wants to clear any obstacles that are put in the way of their relationship, asks Edward why he didn’t allow her to transform into a vampire when he discovered that James had bitten her. Edward blew his top, when he heard it from her. He has always believed that being a human is a  great blessing in itself. He confirms that says he will never allow her to become a vampire. On the contrary, Alice has already foreseen her transformation. Bella strongly believes that she will one day become a vampire in the future. Days pass, and it’s time for Edward to take Bella to prom. Jacob tells Bella that she has to stay away from Edward. Bella insists that he is perfectly safe. Edward tells Bella he took her to the prom because he didn’t want her to miss out on any aspect of being human. She says she wants to be with him forever and would see her transformation into a vampire as a beginning rather than an end. At the end, he promises to never leave her, and puts his lips on her throat, in an attempt to change her into a vampire.