The Industrial Uses of Gold and Silver Essays

The Industrial Uses of Gold and Silver Essays The Industrial Uses of Gold and Silver Essay The Industrial Uses of Gold and Silver Essay The Industrial Uses of Gold and Silver Metals such as gold and silver have been considered precious throughout history for their rarity and aesthetic appeal. These elements are important in modern industry as technological advances expand the applications and uses of their unique physical properties. The uses of these two metals are found in almost every field of interest. From medical to aerospace technology, the applications of these substances provide another reason for their desirability. The evolution of technology has increased its demand for gold’s physical properties. One of the key differences between gold and silver is its resistance to tarnishing. Even though silver and copper are better conductors, gold’s defiance against environmental effects makes it a perfect for electronics where consistent performance over time is desired. Melting other metals with gold forms a gold-based alloy which is extremely heat resistant but can still act as a conductor. These alloys are then used in electronics that operate under intensely high temperatures, such as toasters (World Gold Council, 2012). One significant area where gold is consumed for its reliability is the military. The military uses gold in the form of connectors where the reliability of its electronics is an important factor because using gold connectors can mean the difference between life and death. This is why every tank, helicopter, fight jet, and other military hardware has gold in some form or another. The medical field has also recognized the gold’s reliable characteristics. Most, if not all of the life support electronics are plated with gold as its conductor. One medical application of gold that is not related to electronics is the treatment of a condition called Lagophthalmos. A person with this condition has the inability to fully close their eyes. By implanting tiny amounts of gold in the upper eyelid, the extra weight allows them to completely close their eyes. Gold is used because it has excellent biocompatibility unlike many other metals which have a toxicity level harmful to humans (Goodman, 2002). Gold is not the only metal with medical applications. Silver has valuable anti-bacterial characteristics and unlike other metals with anti-microbial properties, it is not harmful to humans (Daima, 2011 pg. 1). Before antibiotics were invented, silver was been used as a weapon against diseases during World War I. One of the best features about silver is the fact that bacteria cannot adapt to it like they do with antibiotics. Today, silver is added to medical instruments such as bandages and scalpels. Some hospitals have even gone to the extent of coating door knobs, flooring, and files with silver to create a more sanitary environment. Silver was also recently proven to promote the growth of new cells, making wounds heal faster (The Silver Institute, 2012). Even though it is not as corrosion-resistant as gold, it is highly valued in the electronics industry as super conductor. This means silver-based batteries are also super capacitors, lasting much longer than other batteries. Another unique property that silver has is its ability to reflect heat and radiation. Many of today’s office buildings have silver coated windows. This application of silver reflects up to 95% of the Sun’s rays, reducing the cost of cooling during hot summer days (The Silver Institute, 2012).

Sustainable approaches to animal behaviour and welfare research Essay

Sustainable approaches to animal behaviour and welfare research - Essay Example iotic relationship since time immemorial, the other side of the coin that animal too have feelings and superior intelligence have just started dawning on humankind. The nineteenth and the twentieth century saw animals being treated as commodities and exploited without remorse as beasts of burden, as a source of food and entertainment for man, and for biological research in order to search for the secrets of life and cures for debilitating diseases. Voices started being raised for animal welfare during the latter half of the twentieth century when people from some sections of society observed the cruelty being meted out to the poor creatures. Soon, volunteer and social organizations for animal welfare cropped up in all parts of the world and research activities were directed towards the investigation and formulation of better animal welfare policies and initiation of endeavours to stop cruelty on animals started being conceived. Animal welfare science has developed over the last few years as a specialist entity and has come to be recognised as an interdisciplinary effort (Lund et al, 2006). However, the authors feel that it has till now bean the mainstay of representatives of natural sciences only and needs to adopt a broader interdisciplinary perspective to increase its horizon of activity (Lund et al, 2006). The concerns for animal welfare are being addressed internationally by organizations such as the OIE (Office Internatio nal des Epizooties) which provides the international trade agreements for animal welfare and the control of diseases in domesticated farm animals (Lund et al, 2006). The authors feel that the time has arrived when the discipline of animal welfare should encompass a broader horizon by making it a trans-disciplinary subject, as so far it has stayed within the confines of natural sciences only. Animal psychology, ethics, politics and economics too need to be brought into the perspective of animal welfare science according to the authors (Lund et

Perfusion-weighted imaging (PW) MRI (magnetic resonance imaging) Essay

Perfusion-weighted imaging (PW) MRI (magnetic resonance imaging) - Essay Example Either endogenous or exogenous tracers (that is, either native or non-native) can be utilized to regulate haemodynamic quantities, for instance blood movement, blood capacity, and the average time it consumes for the tracer molecule to go through the tissue, or the average transit time. (Luypaert et al., 2001) 1-Exogenous tracer for example gadolinium 2- Utilizing arterial body fluid as an endogenous tracer. 2- Exogenous tracers Perfusion-weighted imaging (PWI) utilizing exogenous tracers confu on magnetic vulnerability and inflow influences to get haemodynamic stats. An exogenous tracer such as gadolinium (in the compound Gd-DTPA or gadolinium diethyltriamine pentaacetate) can be inoculated into the venous mechanism (Luypaert et al., 2001). There is a temporary signal loss as the gadolinium perfuse through the tissues, which can be trailed by MRI. Gd-DTPA is paramagnetic; consequently a change in susceptibility happens between capillaries comprising gadolinium and the nearby tissues . This consequences in robust field gradients in the vicinity of the vessel barriers, bringing to straight signal phasing out in both gradient echo illustrations and diffusion-mediated in spin echo illustrations. Simulation Figure 1: Graphic summary of perfusion-weighted MRI procedure when utilizing intravascular tracers Figure 1 Simulation Figure 2 reveals perfusion-weighted illustrations as gadolinium goes through the brain. There is a postponement before the bolus of tracer blowouts the tissue. As it initializes to rinse through, the signal reduces. As it goes out, the signal returns to normal. Figure 2 Gd appear like to an exogenous tracer that is inoculated into the blood stream and trailed serially with T2*EPI. A signal loss is persuaded every time that GD goes through the capacity of concentration due to the susceptibility influences from the paramagnetic tracer. As it goes through the vessels, a strong gradient is created at the vessel boundaries, which hints to a decrease o f the signal. This damage of signal is proportionate to the concentration of gadolinum. The signal versus time curve can be utilized to make the concentration time curve, which is deconvoluted to get haemodyamic outcomes such as blood movement, blood capacity, and average transit time. Dynamic imaging takes benefit of passing variations in the resident magnetic arena of the adjacent tissue persuaded by a bolus of paramagnetic tracer going through the tissue capillary system. These variations in the native magnetic field can be dignified as signal variation on Magnetic Resonance imaging. Ultrafast illustration methodologies, for example echo planar and helical MR imaging, permit the correct dimension of quickly changing signal variations that are because of the principal permit of the bolus with satisfactory time-based resolution which less than 2 seconds for exposure of the whole brain (Australian Bureau of Statistics, 1999). Signal time progress stats can then be transformed to com parative tracer tissue absorption time progression info. Tracer application time curvatures can then be examined to regulate numerous tissue hemodynamic factors, for example tissue blood capacity, blood movement, transportation time, and bolus

City Life Beats the Small Town Essay Example for Free

City Life Beats the Small Town Essay 1. This essay is an essay of both comparison and contrast because the author points out the similarities while examining the differences. For example, having a cinema in both small town and big city is a similarity, but one cinema in small town showing three different movies at any one time, and a big city having more than one cinema, showing hundred different movies at once is a difference. 2. The writer uses the point-by-point method in writing this essay. 3. The writer provides an equal number of details that relate to the small town and big city in order to give to the readers a proper understanding of differences between the two life-styles. 4. The numerous resources and options available in the city, for the people coming from different parts of the world, to find a group or community similar to their own origin makes life little easier and comfortable for them, as well as they get the opportunity to learn about various cultures and ethnicities, which is the superior nature of the big city. 5. The thesis of the essay is, â€Å"Life is better in the big city, and it all comes down to one general reason: more choice†. 6. The topic sentence of paragraph #2 is, â€Å"One of the areas in which having choice can be extremely valuable is that of friends†. 7. I agree with the author because of my own experience of coming to the city of Toronto as an Immigrant. The resources, opportunities and comfort that a big city can provide in terms of education, work, health, or entertainment are very difficult to find in a small town.

Unforgettable Experiences in the U.S. Essay -- Essays Papers

Unforgettable Experiences in the U.S. Problems faced by international students who come to the U.S. for the first time are not always easy to overcome. As one of them, I've found it very difficult to handle most of the problems I've encountered. I've experienced a very terrible culture shock that still makes me upset. As a student, I've found that the personal and cultural problems I experience may gravely affect my grades. The three major problems I've encountered deal with independence, homesickness, and loneliness, which really shocked me. Since my culture is completely different from the U.S., I was very surprised and shocked by the U.S. way of doing things independently. For many years, I lived in a totally different culture; I was completely unprepared for American culture. For example, since I first came here in August 1990, I have had to do many kinds of work by myself which I had never done when I was in Indonesia, such as doing laundry, cleaning the bedroom, and getting up early in the morning. In Indonesia, I never had a hard time doing such things since everything w...

My Goals and Walden Vision and Mission Essay

Being an Emergency Room nurse for 7 years and working as a traveling nurse in many different parts of the country has impacted my future and decision of going back to school. My personal career goal is to become a Family Nurse Practitioner (FNP) with specialization in pediatric critical care area, mainly pediatric emergency medicine. I have known since a very young age that I had a gift for working with children. My colleagues always call me the â€Å"pediatric nurse†. I feel it takes a very special type of person to work with pediatrics, and this is where my heart is. I chose to become a FNP to broaden my area of expertise and to leave multiple doors open to work in different areas. I have looked into numerous FNP programs across the country, but I was particularly looking for a program that would allow me the flexibility with my changing work schedule and lifestyle. A few co-workers of mine are currently going to Walden and informed me about the school and program. After reading the university and School of Nursing’s vision, mission, and goals, I knew that Walden would be right for me. I strongly agreed with many aspects of what Walden stood for as an overall school. I truly connected to Walden’s mission to provide â€Å"a diverse community of career professionals with the opportunity to transform themselves as scholar-practitioners so that they can affect positive social change† (Walden University, 2013a, para. 2). I value that Walden incorporates everyone’s background and experiences to better the learning of other students. Only being a nurse for 7 years, I have worked in over 17 hospitals and feel that I have gained a vast knowledge of how nursing differs in multiple parts of the country. I relate to Walden University’s statement of the diverse community of students helping to bring positive change including nurses from all aspects of healthcare. Furthermore, two of Walden’s University (2013a) outcomes that really caught my attention were to â€Å"demonstrate a commitment to lifelong learning† (para. 5), and also to utilize â€Å"knowledge to positively impact†¦ profession, communities, and in society† (para. 5). I want to continue to broaden my knowledge over the life of my career. I also believe in using this knowledge to positively impact others in all aspects of healthcare. Incorporating Social Change I agree with Walden University’s (2013a) view on social change that â€Å"Walden supports social change through the development of principled, knowledgeable, and ethical scholar-practitioners, who are and will become civic and professional role models by advancing the better of society† (para. 4). I plan to incorporate social change in my profession by applying my past work experiences and knowledge from school to become a better professional role model to my patients, co-workers and community. An example of one learning outcome for the Master of Science in Nursing is to â€Å"exhibit ongoing commitment to professional development† (Walden University, 2013b, para. 3). I am constantly trying to learn new ways to improve and better my knowledge and education. I recently obtained my Certified Emergency Nurse certification and will soon be taking the Certified Pediatric Emergency Nurse exam. I only hope that with my past experiences and my future knowledge gained at Walden University, I will be able to become a professional advocate and role model for the future of pediatric care and the patient population thereof.

Banned Books History and Quotes

Books are banned for any number of reasons. Whether the controversial content they contain has been found offensive on political, religious, sexual, or other grounds, they are removed from libraries, bookstores, and  classrooms in an effort to keep the public from being harmed by ideas, information, or language that does not conform to societal norms. In America, those who champion the Constitution and The Bill of Rights consider book banning a form of censorship, arguing that its very nature directly contradicts the First Amendment right to free speech. The History of Banned Books In the past, banned books were routinely burned. Their authors were often unable to publish their work, and in the worst-case scenario they were ostracized from society, jailed, exiled—and even threatened with death. Likewise, during certain periods of history and even today in places of extremist political or religious regimes, possessing banned books or other written material may be regarded as an act of treason or heresy, punishable by death, torture, prison, and other forms of retribution. Perhaps the best-known case of recent state-sponsored censorship in its most extreme form was the 1989 fatwa  issued by Irans Ayatollah Ruhollah Khomeini calling for the death of author Salman Rushdie in response to his novel, The Satanic Verses, which was deemed an abomination against Islam. While the death order against Rushdie has since been lifted, in July of 1991, Hitoshi Igarashi, a 44-year-old an assistant professor of comparative culture at Tsukuba University who was translating the book into Japanese, was murdered. Earlier that year, another translator, Ettore Capriolo, 61, was stabbed in his apartment in Milan. (Capriolo survived the attack.) But book banning—and burning—is nothing new. In China, the Qin dynasty  (221–206  BCE) was ushered in with a massive book burning during which most of the original copies of the classic works of Confucious were destroyed. When the Han dynasty  (206  BCE—220 CE) took power, Confucious came back into favor. His works were subsequently recreated by scholars who had memorized them in their entirety—which is likely the reason so many versions currently exist. Nazi Book Burning The most infamous book burning in the 20th century took place in the 1930s as the Nazi party, led by Adolf Hitler, came to power in Germany. On May 10, 1933, university students burned more than 25,000 books in Berlin’s Opera Square that did not align with Nazi ideals. College students from universities across Germany followed suit. Both public and university libraries were ransacked. The books taken were used to fuel huge bonfires that were often accompanied by marshal music and â€Å"fire oaths† denouncing anyone whose thoughts, lifestyle, or beliefs were deemed â€Å"un-German.† It was the beginning of a period of extreme state-sponsored censorship and cultural control. The goal of the Nazis was to purify German literature by ridding it of foreign influences or anything that spoke against their belief in German racial superiority. Writings of intellectuals, especially those of Jewish origin, were targeted. One American author whose works met the same fate was  Helen Keller, a deaf/blind human rights activist who was also a devout socialist. Her writing, as exemplified by the 1913 publication,  Out of the Dark: Essays, Letters, and Addresses on Physical and Social Vision, championed the disabled and advocated for pacifism, better conditions for industrial workers, and voting rights for women. Kellers collection of essays titled How I Became a Socialist (Wie ich Sozialistin wurde) was among the works the Nazis burned. Quotes on Censorship â€Å"You may burn my books and the books of the best minds in Europe, but the ideas those books contain have passed through millions of channels and will go on.†Ã¢â‚¬â€Helen Keller from her  Open Letter to German Students   â€Å"Because all books are forbidden when a country turns to terror. The scaffolds on the corners, the list of things you may not read. These things always go together.†Ã¢â‚¬â€¢Philippa Gregory from  Ã¢â‚¬Å"The Queens Fool† â€Å"I hate it that Americans are taught to fear some books and some ideas as though they were diseases.†Ã¢â‚¬â€¢Kurt Vonnegut â€Å"The important task of literature is to free man, not to censor him, and that is why Puritanism was the most destructive and evil force which ever oppressed people and their literature: it created hypocrisy, perversion, fears, sterility.†Ã¢â‚¬â€¢Anaà ¯s Nin from  Ã¢â‚¬Å"The Diary of Anaà ¯s Nin: Volume 4† â€Å"If this nation is to be wise as well as strong, if we are to achieve our destiny, then we need more new ideas for more wise men reading more good books in more public libraries. These libraries should be open to all—except the censor. We must know all the facts and hear all the alternatives and listen to all the criticisms. Let us welcome controversial books and controversial authors. For the Bill of Rights is the guardian of our security as well as our liberty.†Ã¢â‚¬â€¢President John F. Kennedy â€Å"What is freedom of expression? Without the freedom to offend, it ceases to exist.†Ã¢â‚¬â€¢Salman Rushdie The Definitive Book on Book Burning Ray Bradburys 1953 dystopian novel Fahrenheit 451 offers a chilling look at an American society in which books are outlawed and any found are incinerated. (The title refers to the temperature at which paper ignites.) Ironically, Fahrenheit 451 has found itself on several banned books lists. â€Å"A book is a loaded gun in the house next door...Who knows who might be the target of the well-read man?†Ã¢â‚¬â€From Fahrenheit 451 by Ray Bradbury The Book Banning Pendulum Swings Both Ways Books that have a history of having been banned, even those now restored to the so-called canon of respectable reading, are still considered banned books from a historical perspective. By discussing the machinations behind the banning of such books in the context of the time and place in which they were banned, we gain insight into the rules and mores of the society responsible for the censorship. Many books considered tame by todays standards—including Aldous Huxleys Brave New World and James Joyces Ulysses—were once hotly debated works of literature. On the flip side, classic books such as Mark Twains The Adventures of Huckleberry Finn have recently come under fire for cultural viewpoints and/or language that was accepted at the time of publication but is longer deemed socially or politically correct. Even works by Dr. Seuss (a vocal anti-fascist) and acclaimed childrens author Maurice Sendak, along with L. Frank Baums The Wonderful Wizard of Oz, have been banned or challenged at one time or another. Currently, in some conservative communities, theres a push to ban J.K. Rowlings Harry Potter series books, which detractors claim are guilty of promoting anti-Christian values and violence. Keeping the Banned Book Discussion Alive Launched in 1982, Banned Books Week, an annual end-of-September event sponsored by the American Library Association and Amnesty International, focuses on books that are currently being challenged as well as those that have been banned in the past and highlights the struggles of writers whose works fall outside some of societys norms. According to its organizers, this weeklong celebration of controversial reading stresses the importance of ensuring the availability of those unorthodox or unpopular viewpoints to all who wish to read them. As society evolves, so does the perception of what literature is deemed appropriate reading. Of course, just because a book has been banned or challenged in some parts of the United States doesnt mean the ban is nationwide. While Amnesty International has cited only a few writers from China, Eritrea, Iran, Myanmar, and Saudi Arabia who have been persecuted for their writings, for those who consider reading a human right, its important to keep abreast of incidents of book banning around the world. Sources Helen Keller Writes a Letter to Nazi Students Before They Burn Her Book: History Has Taught You Nothing If You Think You Can Kill Ideas’†. OpenSource. May 16, 2007Weisman, Steven R. Japanese Translator of Rushdie Book Found Slain. The New York Times. July 13, 1991