Wednesday, January 29, 2020
Qwertyui Essay Example for Free
Qwertyui Essay PROPERTIES OF LASER First, lets discuss the properties of laser light and then we will go into how is is created. Laser light is monochromatic, directional, and coherent. Monochromatic The light emitted from a laser is monochromatic, that is, it is of one wavelength (color). In contrast, ordinary white light is a combination of many different wavelengths (colors). Directional Lasers emit light that is highly directional. Laser light is emitted as a relatively narrow beam in a specific direction. Ordinary light, such as coming from the sun, a light bulb, or a candle, is emitted in many directions away from the source. Coherent The light from a laser is said to be coherent, which means the wavelengths of the laser light are in phase in space and time. These three properties of laser light are what make it more of a hazard than ordinary light. Laser light can deposit a great deal of energy within a very small area as James Bond nearly found out in Goldfinger! BENEFITS OF LASER Nuclear fusion Some of the worlds most powerful and complex arrangements of multiple lasers and optical amplifiers are used to produce extremely high intensity pulses of light of extremely short duration. These pulses are arranged such that they impact pellets of tritium-deuterium simultaneously from all directions, hoping that the squeezing effect of the impacts will induce atomic fusion in the pellets. This technique, known as inertial confinement fusion, so far has not been able to achieve breakeven, that is, so far the fusion reaction generates less power than is used to power the lasers, but research continues. Microscopy Confocal laser scanning microscopy and Two-photon excitation microscopy make use of lasers to obtain blur-free images of thick specimens at various depths. Laser capture microdissection use lasers to procure specific cell populations from a tissue section under microscopic visualization. Additional laser microscopy techniques include harmonic microscopy, four-wave mixing microscopy and interferometric microscopy. Military Military uses of lasers include applications such as target designation and ranging, defensive countermeasures, communications and directed energy weapons. Directly as an energy weapon Directed energy weapons are being developed, such as Boeing’s Airborne Laser which was constructed inside a Boeing 747. Designated the YAL-1, it is intended to kill short- and intermediate-range ballistic missiles in their boost phase. Defensive countermeasures Defensive countermeasure applications can range from compact, low power infrared countermeasures to high power, airborne laser systems. IR countermeasure systems use lasers to confuse the seeker heads on heat-seeking anti-aircraft missiles. High power boost-phase intercept laser systems use a complex system of lasers to find, track and destroy intercontinental ballistic missiles (ICBM). In this type of system a chemical laser, one in which the laser operation is powered by an energetic chemical reaction, is used as the main weapon beam (see Airborne Laser). The Mobile Tactical High-Energy Laser (MTHEL) is another defensive laser system under development; this is envisioned as a field-deployable weapon system able to track incoming artilleryprojectiles and cruise missiles by radar and destroy them with a powerful deuterium fluoride laser. Another example of direct use of a laser as a defensive weapon was researched for the Strategic Defense Initiative (SDI, nicknamed Star Wars), and i ts successor programs. This project would use ground-based or space-based laser systems to destroy incoming intercontinental ballistic missiles (ICBMs). The practical problems of using and aiming these systems were many; particularly the problem of destroying ICBMs at the most opportune moment, the boost phase just after launch. This would involve directing a laser through a large distance in the atmosphere, which, due to optical scattering and refraction, would bend and distort the laser beam, complicating the aiming of the laser and reducing its efficiency. Another idea from the SDI project was the nuclear-pumped X-ray laser. This was essentially an orbiting atomic bomb, surrounded by laser media in the form of glass rods; when the bomb exploded, the rods would be bombarded with highly-energetic gamma-ray photons, causing spontaneous and stimulated emission of X-ray photons in the atoms making up the rods. This would lead to optical amplification of the X-ray photons, producing an X-ray laser beam tha t would be minimally affected by atmospheric distortion and capable of destroying ICBMs in flight. The X-ray laser would be a strictly one-shot device, destroying itself on activation. Some initial tests of this concept were performed with underground nuclear testing; however, the results were not encouraging. Research into this approach to missile defense was discontinued after the SDI program was cancelled. Disorientation Some weapons simply use a laser to disorient a person. One such weapon is the Thales Green Laser Optical Warner. Medical * Cosmetic surgery (removing tattoos, scars, stretch marks, sunspots, wrinkles, birthmarks, and hairs): see laser hair removal. Laser types used indermatology include ruby (694 nm), alexandrite (755 nm), pulsed diode array (810 nm), Nd:YAG (1064 nm), Ho:YAG (2090 nm), and Er:YAG (2940 nm). * Eye surgery and refractive surgery * Soft tissue surgery: CO2, Er:YAG laser * Laser scalpel (General surgery, gynecological, urology, laparoscopic) * Photobiomodulation (i.e. laser therapy) * No-Touch removal of tumors, especially of the brain and spinal cord. * In dentistry for caries removal, endodontic/periodontic procedures, tooth whitening, and oral surgery
Tuesday, January 21, 2020
Exhange Risk Faced by Multinational Corporations (MNCs) Essay -- Exhan
â€Å"Exchange rates are the amount of one country’s currency needed to purchase one unit of another currency (Brealey 1999, p. 625)†. People wanting to exchange some money for their vacation trip will not be too much bothered with shifts if the exchange rates. However, for multinational companies, dealing with very large amounts of money in their transactions, the rise or fall of a currency can mean getting a surplus or a deficit on their balance sheets. What types of exchange rate risks do multinational companies face?      One type of exchange risk faced by multinational companies is transaction risk. If a company sells products to an overseas customer it might be subject to transaction risk. If a UK company is expecting a payment from a US customer in June and the invoice was made in January, the exchange rate is bound to have changed during the period. If the deal was worth  £1,000,000 and the american dollar compared to pound sterling weakened from US$1.40 in January to US$1.50 in June, the UK company would loose  £47,619 (Appendix A).      Economic risk is another type of exchange risks companies have to consider when dealing globally. Changes in exchange rates are bound to affect the relative prices on imports and exports, and that will again affect the competitiveness of a company. An UK exporter dealing with companies in the US would not want the US$ to depreciate, because it would make the exports more expensive for the US market, thus the company will loose business.      Other types of exchange rate risks are translation risk and so-called hidden risk. The translation risk relates to cases where large multinational companies have subsidiaries in other countries. On the financial statement of the whole group, the company may have to translate the assets and liabilities from foreign accounts into the group statement. The translation will involve foreign exchange exposure. The term hidden risk evolves around the fact that all companies are subject to exchange rate risks, even if they don’t do business with companies using other currencies. A company that is buying supplies from a local manufacturer might be affected of fluctuating foreign exchange rates if the local manufacturer is doing business with overseas companies. If a manufacturer goes out of business, or experience heavy losses, it will affect all the companies it does business with. The co... ...he curve. Appendix A. Transaction Risk:      A UK exporter invoicing US$1,000,000 in January for payment in June. Spot rates: January: US$1.40                £714,286      February: US$1.50                £666,667      Loss on transaction:                 £47,619 ( £714,286 -  £666,667) Appendix B. Interest Rates: i.     A company borrows  £100,000 from a bank at 8% interest rate.       £100,000 X 1.08 =  £108,000 ii.     A company borrows  £2,000,000 in 1998, with a fixed interest rate of 8%, payable annually for a 5 year period. Fixed annual interest, 8%:  £2,000,000 X 0.08 =  £160,000 New annual interest, 6%:  £2,000,000 X 0.06 =  £120,000 Annual loss, 6% vs. 8%:  £160,000 -  £120,000 =  £40,000 References: http://www.expedia.com, 22/11/2000, http://www.expedia.com/pub/Agent.dll Brealey, Richard A., Marcus, Alan J., Myers, Stewart C. 1999, Fundamentals of Corporate Finance, 2nd edn, Craig S. Beytien, USA. Howells, Peter., Bain, Keith 2000, Financial Markets and Institutions, 3rd edn, Henry King Ltd., Great Britain. Ritter, Lawrence R., Silber, William L., Udell, Gregory F. 2000, Money, banking, and Financial Markets, 10th edn, USA.
Sunday, January 12, 2020
Earth and Yuri Gagarin
In my presentation I will tell you about the first cosmonaut. The purpose of this presentation to know more about the life of Yuri Gagarin and his exploits. Also explains how Gagarin prepared to fly into space, the process of this important event and what happened with the first cosmonaut after he made his flight. And in the presentation contains different photos of Gagarin with his family and friends. Career in the Soviet space program It was on the 12th of April, 1961, when the first flight by man into cosmic space took place. Yuri Gagarin, the first cosmonaut in the world, he was a 27 years old Air Force pilot at that time. The space ship flew at the speed of 300 miles a minute. That’s six times faster than man ever travelled before. His flight lasted 108 minutes, but a circuit round the Earth took 89 minutes. It was a brilliant achievement on the part of our scientists and technologists, and on the part of Gagarin who risked his life to achieve a victory for his country. This is what Yuri Gagarin said at this press conference: â€Å"On my flight around the Earth was clearly seen: the continents, island and seas. Flying over the land I could clearly see the big squares of fields and it was possible to distinguish which was meadow and which was forest I could not see as well as from an airplane. I saw for the first time with my own eyes the Earth’s shape. I must say that the view of the horizon is very beautiful. You can see the noticeable change from the light surface of the Earth in to completely black sky in which you can see the stars. It is very gradual and lovely. In space the shines ten times more brightly than on the Earth. The stars can be seen very well. I felt excellent as I entered space. Everything was easier to do when weightlessness . My legs and arms weighed nothing. Objects swam in the cabin. During this state of weightlessness I ate and drank and everything was the same as on the Earth. The passage back from weightlessness to the force of gravity happened smoothly. Arms and legs feel the same as during weightlessness, but now they have weight. When I returned to the Earth I was full of joy. †Death and legacy After the flight Gagarin became a worldwide celebrity. He went around the globe with press conference and everywhere people were impressed by his charming smile, inelegance and simplicity. In 1962, he began serving as a deputy to the Supreme Soviet. Unfortunately, he tragically died during a training flight on an airplane. But he is remembered throughout Russia forever. American astronauts Neil Armstrong and Edwin Aldrin left one of Gagarin's medals on the moon as a tribute. Moreover in Russia there are a lot of streets, squares, schools and colleges bear his name.
Saturday, January 4, 2020
Misguided Love in The Glass Menagerie Essay - 1404 Words
Misguided Love in The Glass Menagerie The Glass Menagerie, written by playwright Tennessee Williams, is the story of a family torn apart by heartbreak from the past and tragedy from the present. Williams parallels this play to his true life experience with his own family, which makes The Glass Menagerie an even more tragic version of what happens to a family when love is lost and abandonment is reality. Providing for a family can be an overwhelming responsibility, for there are many pitfalls along the way, some families are able to cope, some are not, and The Glass Menagerie gives us insight into what truly happens to a family when faced with abandonment. The story begins in The Wingfield apartment in the rear of a building,†¦show more content†¦Laura, crippled at birth, is so profoundly introverted, partly because of her handicap, but mostly because of her mothers inability to come to grips with her beautiful daughters fragile state of mind. One evening at the insistence of Amanda, Tom brings a gentlemen caller, Jim, home for dinner; in hopes as Amanda puts it, that he will surely see how lovely her daughter is, and will ultimately win Lauras heart and take care of her for the rest of her life. Jim and Laura soon realize that they know one another from high school, and quickly establish a friendly conversation. Laura, for a brief moment, releases her shy and sullen personality and shares her precise glass figurines with Jim. Jim becomes infatuated by Laura, her innocence, her vulnerability, her quaint disability, and in a moment of passion, kisses her, only to realize his foolish gesture was a grave mistake; for his heart is already taken by another. He awkwardly apologizes to Laura, and abruptly excuses himself, leaving Laura to sink even further away from reality. Amanda, of course, blames Tom for the dinner fiasco, and humiliates him beyond the breaking point, leaving the family torn apart. Tom can no longer bare his mothers constant accusation that he will turn out to be just like his father; and Amandas inability to help her precious, innocent,Show MoreRelatedThe Glass Menagerie By William Shakespeare Essay1489 Words  | 6 PagesWe all want to disappear at times†¦ escape even. In the end we all know that we cannot run from our problems, no matter where you run they are always there lurking in the shadows. Tennessee William’s 1944 play â€Å"The Glass Menagerie†is a remembrance of time long ago and wanting to escape the unhappy, confining lives of Tom, Amanda, Laura and Jim. Although they are unhappy with their lives they choose to hide from the reality. Amanda is stuck in a lifetime ago- her youth ba ck in St. Louis in the 1930sRead More Illusion vs. Reality in The Glass Menagerie Essay2797 Words  | 12 PagesIllusion vs. Reality in The Glass Menagerie        In The Glass Menagerie, Tennessee Williams uses the roles of the members of the Wingfield family to highlight the controlling theme of illusion versus reality. The family as a whole is enveloped in mirage; the lives of the characters do not exist outside of their apartment and they have basically isolated themselves from the rest of the world. Even their apartment is a direct reflection of the past as stories are often recalled from theRead MoreThe Glass Menagerie By Tennessee Williams2151 Words  | 9 Pagesâ€Å"The Glass Menagerie†is a riveting play by Tennessee Williams that takes place in 1930’s St. Lois. This play is unique in the manner that it is a memory play. The narrator, Tom Wingfield, is also one of the main characters. Tom is the son to Amanda Wingfield, and the brother to Laura Wingfield. Toms father, whom is referred to as Mr. Wingfield, left his family and has only sent one postcard from Mexico since his desertion. Alth ough Mr. Wingfield deserted his family his picture still remains
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