Cell phones Essay Example for Free

Cell phones Essay Complications come with the breakthrough of technology and this is especially true with cell phones. It is quite difficult to imagine how much change in communications occurred in just the past decade. I remember very well I acquired my first cell phone: it was what they call an analog (Frieden, 2007). It was pricey that time although it was a second hand one that a friend sold to me. It felt light and sleek at that time though by today’s standard, it is as heavy and bulky as the standard phone receiver. Today, it seems that the only people who are not using these miniature phones are infants. And that is even narrowing. There are several instances that demonstrate both the help and convenience, and irritation that this gadget brings. It is very functional; one can use it as a flashlight especially during concerts. One can also use it as mirror in case the lady forgets one and she wants to floss her teeth. How? Take a good snapshot of your toothy smile or make a video shoot of your grin. There a thousand and one uses of this communication instrument. Many so-called sex scandals were indecently recorded by individuals who have no very worthy pursuits with which they can pour forth their boundless energies. Moreover, criminals have developed fantastic means in order to milk money from people. One such case is a former student. There was this snatcher who was very ingenious about the cell phone he took. He did not throw the simcard away. Instead he started to send SMS to people in the phone book/contacts and asked them to foot this particular bill; the cell phone happens to have a program that allows the head of the family to make some deductions or send money to an intended person/persons. More than five responded positively and the snatcher-con-swindler had managed to milk money in substantial amounts from the owner’s friends and relatives. On the other hand many of a cell phone’s additional functions include (in the case of students) the accumulation of different poses from the cell phone’s camera, for keepsakes; a brief MTV production minus the costs; access to the internet and television shows among others. With these conveniences are handfuls also of problems. Have you heard for instance newly discovered requisites? Have you also heard of fingernail â€Å"stubs,† whose pastime is simply wanting to relieve themselves of their incessant boredom. How about the appearance of inseparability between the owner and the gadget? Not only that, many of those who spend time with their cell phones have started to overlook the effects of the distraction that their pre-occupation with the instrument brings. Reference: 1. Frieden, Robert. Telecommunications. Microsoft ® Encarta ® 2007 [DVD]. Redmond, WA: Microsoft Corporation, 2006.

History Of The Jet Engine :: Aviation Engines

Evolution of the Jet Engine Thought the course of time man has constantly sought to better both himself and mankind through creation and invention. From the first time a caveman rubbed two sticks together and discovered fire to the design and development of the Saturn 5 rocket which propelled by that same fire carried man from the earth to the moon. One can argue over whether on not this invention or that was the greatest. I intend to focus my attention on evolution of just one of those technologies the jet engine, and show the importance of its impact in our world. In the early 1920’s, new technology was being developed to enable aircraft to fly higher and faster. This early development of aircraft technology was hindered by the depression until World War II pulled the United States out of economic hardship. Jet engine design has been critical in keeping aircraft in line with other countries’ developing technology. All over the world, countries were racing to be the first with a jet engine powered aircraft. During World War II the quest for air superiority resulted in the need for better, faster aircraft. As a result, the jet engine was created. A simple jet engine can be described as a device that compresses large amounts of high velocity air which mixes with fuel, ignites, and then is propelled out the aft end of the aircraft. Able to keep itself going once started, the jet engine is truly a marvel of the twentieth century. Two people are credited with this wonderful invention: Dr. Hans von Ohain (German) and Sir Frank Whittle (British). Ohain actually created the first engine while Whittle was the first to acquire a patent in 1930. However, Ohain’s jet was the first to fly in 1939, while Whittle was able to get his in the air in 1941. Ohain’s jet engine was tested in a lab in Sep. 1937 and first tested on a plane developed by Ernst Heinkel the Heinkel He178 on Aug. 27th, 1939. The Firm, Power Jets Ltd., got a contract for Whittle’s engine, the W1, July 7th, 1939. The Maiden flight was on May 15th, 1941 with pilot Lieutenant P. E. G. Sayer flying the craft, the Gloster E28/39. The craft flew at roughly 400 mph and the engine produced 1000lbs.

Greek Art

Ancient Greek Art: Archaic, Classical, and Hellenistic By: Catherine Marten CLA3114 sect. 02D3 Spring 2013 Art is the expression or application of human creative skill and imagination, usually through visual forms. Art in ancient Greece went through a variety of changes throughout its history, especially from the Archaic to the Hellenistic periods. These changes are mainly due to the different views in Greek society that developed throughout these periods.The art of the Archaic, Classical, and Hellenistic eras in ancient Greece are examples of how the philosophical views of the ancient Greeks changed and developed from 600-31 BCE and are still influencing views on art today. The art of ancient Greece during the Archaic era (600-480 BCE) made a shift from the earlier geometric forms of patterns and shapes to a more realistic form with large human sculptures being the focus. Many of the sculptures of this era seem to reflect an Egyptian influence from the East. The Archaic style of scu lpture was stiff and blocky like that of the Egyptians' sculptures.The two most prominent types of sculptures of this time were the male â€Å"kouros†, or standing youth, and the female â€Å"kore†, or standing draped maiden1. These large limestone statues were usually made as dedications to the gods or as grave markers. They could be found at funeral monuments outside of the city walls. Among the earliest examples of the type, the kouros in the Metropolitan Museum reveals Egyptian influence in both its pose and proportions2. The statues of the Archaic period were not always made to depict specific individuals.Instead, they exemplified the ancient Greek's new view of beauty and perfection. They were always statues of young men and women that ranged in age between adolescence and maturity. The male statues were usually not clothed and the female statues were clothed. This was most likely because the Greeks did not approve of female nudity in public. Another art form tha t emerged in the Archaic era was that of red figure pottery. It was invented in Athens around 530 BCE3. This style of pottery was characterized by red figures on a black background, where the figures were created in the original red of the clay.This allowed for more details to be seen in the pottery than with the earlier black figure technique because lines could be drawn onto the figures rather than being scraped out. The firing process of both red and black figure pottery was the same. It consisted of three stages. The first stage was called the oxidizing stage where air was allowed into the furnace. This resulted in the whole vase turning the color of the clay. In the second stage, green wood was introduced into the chamber and the oxygen supply was reduced. This caused the object to turn black in the smoky surroundings.In the third stage, air was reintroduced into the furnace which resulted in certain portions turning back to red while the glossed areas remained black. The red f igure technique gradually replaced the black figure technique as innovators recognized the possibilities that came with drawing forms4. Again, the images looked more realistic than previous art forms because of the more natural look of anatomy and garments. Painted vases were often made into different shapes for specific uses. A vase used for storing and transporting wine and food was called an â€Å"amphora†.A vase used for drawing water was called a â€Å"hydria†, and one used for drinking wine or water was called a â€Å"kantharos† or â€Å"kylix†4. The subject matter of red figure vases varied greatly from portraits of the gods and heroes, to depictions of every day Athenian life5. This, in turn, led to result in an archaeological record of historical, social, and mythological information of ancient Greece. The pictorial decorations provide insights into many aspects of Greek life and complement some of the literary texts and inscriptions from the Arc haic and, especially, Classical eras6.The Classical era (480-323 BCE) showed more advancements in the art of sculpture. The main subjects of Classical sculpture were young and athletic men with a heavy emphasis on the details of the human body. Unlike the stiff and upright sculptures of the Archaic style, Classical sculptures were more naturalistic and oriented in positions that suggested movement. The fluidity of the sculptures reflected the freedom of movement and expression that was associated with an introduction of democracy7. The aim of the Classical style was perfection.This resulted in many of the faces of the statues looking the same which made it difficult to identify who the statue depicted at times. However, the subjects of the sculptures in the Classical era were specific people or gods, rather than just a generic young man or woman like in the Archaic era. The sculpture style of the Classical period started using marble and bronze to make the statues. Bronze, valued fo r its strength and beauty, became the preferred medium for freestanding sculptures. However, many of the original statues seem to have disappeared in history.This is most likely because they were found to be of great value. These famous statues are known of through ancient literature and Roman copies later made. Greek artists of the Classical era attained a manner of representation that conveys a vitality of life as well as a sense of permanence, clarity, and harmony8. Polykleitos of Argos was particularly famous for formulating a system of proportions that achieved this artistic effect and allowed others to reproduce it. The Classical period also saw the start of sculptors becoming well known for their works.One sculptor named Phidias created a statue of the goddess Athena made of ivory and gold which was housed inside the Parthenon in Athens. It was later stolen and no longer exists today. He is also well known for overseeing the design and building of the famous Parthenon which i s an artwork in itself. Another sculpture that Phidias is famous for is the Statue of Zeus in the Temple of Zeus found in Olympia. It, too, was made of ivory and gold and was eventually lost just like the statue of Athena. Another sculptor named Praxiteles was an Athenian who became famous for creating the nude Aphrodite of Knidos.This statue was one of the first statues showing a woman nude rather than draped in cloth. Its slender proportions and distinctive contrapposto stance became hallmarks of fourth century B. C. Greek sculpture8. The Hellenistic era (323-31 BCE) followed the conquests of Alexander the Great, and Greek culture started to spread more east to as far as India. During this period, Greek sculpture became even more naturalistic than in the Classical era. Young men and women were no longer the only subjects of sculpture. Instead, common people, children, elderly, and animals were subjects.There were even representations of unorthodox subjects, such as grotesques9. Sc ulptors no longer felt obliged to depict people as having ideal beauty or being perfect. Instead, heavy emotion and movement were the focus. Pain and fear were shown on the faces of figures and battle scenes were even carved into relief sculptures for temples. Sculpture eventually became somewhat of an industry during this era which resulted in some lowering of quality10. Because of this, many statues from the Hellenistic period are still around today unlike those of the Classical period.The Hellenistic period saw the decline of the painting of vases. Red figure painting died out and was replaced by what is known as West Slope ware. This style consisted of painting in a tan colored slip and white paint on a fired black slip background with some simpler detailing. The most common vases are black and uniform with a shiny appearance like that of varnish and decorated with simple motifs of flowers. The Hellenistic period is also the period when vases in relief appeared. Relief is a mode of sculpture where raised forms and figures projecting detail or ornament are distinguished from a surrounding plane surface.Many times wreaths in relief were applied to the body of vases. There were also more complex reliefs based on animals or mythological creatures. There also appeared to be a shift in the tradition of painting. Artists started to seek a greater variety of tints than in the past. However, these newer colors were more delicate and did not support heat. The painting occurred therefore after firing, in contrast to the traditional practice. The fragility of the pigments prevented frequent use of these vases. This resulted in them being reserved for use in funerals.The conventional end of the Hellenistic period is 31 BCE, the date of the battle of Actium. Octavian, who later became the emperor Augustus, defeated Marc Antony's fleet and, consequently, ended Ptolemaic rule9. The Ptolemies were the last Hellenistic dynasty to fall to Rome. Interest in Greek art and cult ure remained strong during the Roman Imperial period, and especially so during the reigns of the emperors Augustus and Hadrian. For centuries, Roman artists continued to make works of art in the Hellenistic tradition. Bibliography 1. Boardman, John.Greek Sculpture, The Archaic Period. London: Thames and Hudson Ltd, 1978. 2. Department of Greek and Roman Art. â€Å"Greek Art in the Archaic Period†. In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000–. http://www. metmuseum. org/toah/hd/argk/hd_argk. htm (February 2013) 3. Boardman, John. The History of Greek Vases. Thames & Hudson, 2006. 4. Department of Greek and Roman Art. â€Å"Athenian Vase Painting: Black- and Red-Figure Techniques†. In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000–. http://www. etmuseum. org/toah/hd/vase/hd_vase. htm (February 2013) 5. Carpenter, Thomas H. Art and Myth in Ancient Greece. Thames & Hudson, 1991. 6. No rris, Michael. Greek Art from Prehistoric to Classical: A Resource for Educators. New York: Metropolitan Museum of Art, 2000. 7. Pollitt, Jerome J. Art and Experience in Classical Greece. Cambridge: Cambridge University Press, 1972. 8. Hemingway, Colette, and Sean Hemingway. â€Å"The Art of Classical Greece (ca. 480–323 B. C. )†. In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000–. http://www. metmuseum. rg/toah/hd/tacg/hd_tacg. htm (February 2013) 9. Hemingway, Colette, and Sean Hemingway. â€Å"Art of the Hellenistic Age and the Hellenistic Tradition†. In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000–. http://www. metmuseum. org/toah/hd/haht/hd_haht. htm (February 2013) 10. Hemingway, Colette, and Sean Hemingway. â€Å"Ancient Greek Colonization and Trade and their Influence on Greek Art†. In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2 000–. http://www. metmuseum. org/toah/hd/angk/hd_angk. htm (February 2013)

Creationism Vs. Evolution Essay - 1318 Words

In 1859, Charles Darwin published his book On the Origin of Species by Means of Natural Selection, which proposed the theory of evolution. This book, along with others that followed, began the long dispute between evolutionist and creationist. Were we created by a supernatural Supreme Being, or did our creation occur purely by chance? First, lets look at the two conflicting theories. Common usage of the term â€Å"evolution† is that living things in our world have come into existence through unguided naturalistic processes beginning from a primeval mass of subatomic particles and radiation, over 20 billion years ago. The idea of Creation comes from the first two chapters of Genesis which states that God created the heavens and†¦show more content†¦Therefore we have a catch-22 situation. Besides, there are geological evidences that confirm the existence of an oxidizing atmosphere as far back as can be determined. Among these are: the oxidation of ferrous iron in early rocks, and the precipitation of limestone in great quantities.1 Now, lets assume for a minute that the ideal environment for evolution to occur existed. We would then need a means by which the basic building blocks of life could be constructed. Before you can assemble the large macro-molecules necessary for life you must have a ready supply of basic organic molecules. Among these would be tons of sugars, amino acids, purines, and pyrimidines. Now assuming we had a vast primitive ocean full of these molecules there are still obstacles that would need to be overcome to have a suitable ocean. The first problem would be the diluting effect of the vast ocean. There would not be enough quantities of each basic molecule for molecular formation therefore insufficient quantities would result. The second problem would be that in order for chemical bonds to form there would need to be an external source of energy. Unfortunately t he same energy that creates these bonds is much more likely to destroy them. The last major obstacle to overcome would be the incompatibility of differentShow MoreRelatedEvolution Creationism Vs. Creationism924 Words   |  4 PagesAny point of contact with the scientific world in the 21st century will eventually lead one to the one of the most hotly contested topic in American education, that of evolution versus creationism. While the creationist point of view, as well as the evolutionary perspective, hosts a great variation of opinion amongst its supporters, Christianity is brought to the center stage time after time (Vuletic, 1994). Literal interpretation of the Book of Genesis’ account of creation falls contrary to theRead More Evolution Vs. Creationism Essay1323 Words   |  6 PagesEvolution vs. Creationism Abstract In the history of science vs. religion there have been no issues more intensely debated than evolution vs. creationism. The issue is passionately debated since the majority of evidence is in favor of evolution, but the creation point of view can never be proved wrong because of religious belief. Human creation breaks down into three simple beliefs; creation theory, naturalistic evolution theory, and theistic evolution theory. The complexities of all threeRead More Creationism vs. Evolution Essays1663 Words   |  7 PagesCreationism vs. Evolution This paper will focus on the huge controversy between Creationism and Evolution. I will provide two opposing viewpoints on this subject. First, the discussion will focus on the question of why many people believe that God created the universe and all living things. On the other end of the spectrum, scientific information will be presented that substantiates the evidence against the existence of God. This creationism counter-argument known as evolution has itsRead More Evolution vs. Creationism Essay917 Words   |  4 Pages Evolution vs. Creationism The Evolution vs. Creationism controversy goes all the way back to the Publishing of Origin of Species in 1859 by Darwin laying the foundation for the evolution of life to be understood. Scientists are continuously finding more evidence to support Darwin’s conclusion; that organisms descended from a common ancestor modified by the mechanism of natural selection resulting in the evolution of species adapting to their environment. The following are the main geological topicsRead More Creationism vs. Evolution Essay1158 Words   |  5 Pagesnbsp;nbsp;nbsp;nbsp;nbsp;Where we come from is a question as old as mankind itself. There are countless numbers of religions, each with their own twist on the origins of earth and mankind, but one of the most highly visible debates would be creationism vs. evolution. Depending on where your beliefs lie, the Earth has been around somewhere in the neighborhood of 6,000 years to 4.5 billion years. One would tend to believe that this vast differe nce in time would make it impossible to have 2 â€Å"theories† thatRead MoreCreationism Vs. Evolution1130 Words   |  5 Pages Where do we come from? The creation of the world has been told through many different stories, and from a variety of religions across the world. The argument between evolution and creation has been debated back and forth for years. So how do we know which claim is correct? Has all life evolved from simple bacteria to all the species that appear today, or did life on earth begin with Gods creation of Adam from dust and his partner Eve from adam’s rib bone. As a child I grew up attending church everyRead MoreEvolution Vs. Creationism Debate1265 Words   |  6 PagesIn this paper I will be explaining two sides of the evolution vs. creationism debate. The topics I am going to write about are fossil evidence, the origin of life, and Darwin’s â€Å"theory† of natural selection. I will be presenting a view of both sides of the argument they will be on the creation side and evolution standpoint. I would suggest that you, the reader, would have a previous knowledge of all the topics so that you may get a full understanding of both sides. If there is no prior knowledgeRead MoreCreationism vs. Evolution Essay1170 Words   |  5 Pagesassumptions with empirically deduced scientific theories. The Catholic Church had a nasty habit of persecuting such ideological dissent toward creationism, calling it heresy and thereby somewhat suppressing a complete upheaval of the Scriptures. For many centuries to come, the scientific research grew and developed into theories like the Big Bang and evolution, though primarily in places where such progress was tolerated. The state of Tennessee in 1925 was not such a place. In the town of DaytonRead MoreCreationism vs. Evolution Essay1349 Words   |  6 Pages Creationism is the theory that man, the earth, and the rest of the universe was originally created rather than randomly exploding from nothingness into chance existence. We reside on the surface of a small superbly crafted, autonomous self regulating spac e vehicle. Together with survival, conquest and death we bear witness to beauty, fragrances, love and music. Think about this. Mathematics, philosophy, springtime, depravity, farming, courtship, quasars, and iphones; all came from nothingness?,Read MoreEssay on Evolution VS. Creationism1412 Words   |  6 Pagesof man and how all living things acquired their characteristics. The two main theories that arose over time were Creationism and Evolution, both of which provided very distinct answers to this question. Creationism based its answer on the idea of a supernatural power or being that created the entire universe, man and the numerous other organisms that live within it. While, Evolution theorizes that all living things have the potential to change and grow over time into something new and different