Pros and Cons of Science and Technology free essay sample

The outcomes of scientific and technological research have strongly influenced civilization throughout history. It is evident that the applications of the two have been both beneficial and unsuited to human society simultaneously. Although science and technology have greatly contributed to elevating the quality of life, especially in the areas of geology and communication, it has also negatively impacted the world through its misuse. In ancient times, people relied on sorcerers and witch doctors to explain why many natural disasters occurred. Whenever a volcano erupted, or an earthquake occurred, it was often believed that the gods were enraged. Sometimes, many innocent people were terribly sacrificed to appease the gods’ wrath. Appeasing the supernatural forces, which could either wipe out entire villages or grant bountiful crops through natural disasters, was a sacred duty in many ancient societies. Ritual sacrifices were considered necessary for this propitiation and for maintaining a proper reciprocal relationship between humans and the supernaturals. We will write a custom essay sample on Pros and Cons of Science and Technology or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Thankfully, technology can now be used to understand, predict, and explain many of these natural phenomenons, and this ultimately alleviate the loss of lives and commodities. Communication has evolved over the centuries from signals and pictures to written words and the spoken language. With language, any message, no matter how complex, can be conveyed between people over a limited distance. For many people, communicating with family used to mean sending cards and letters through the mail and getting no response until weeks later. For the past decade, technology has transformed the way people communicate, in part due to the advent of the Internet. Instead of mailing letters, people are writing e-mails and greeting cards that can be sent instantly to one or more recipients. Many people have already gotten rid of their land-line phones and replaced them with mobile phones, even smart phones. Free video calls can be placed to anyone in the world over the Internet by using Skype and a headset. Mobile phones have become a stroke of luck, letting individuals call others no matter where they are. Society has become so dependent on technology to the point that people frequently cease to think before they take actions. It is absolutely normal for individuals to become impatient if it takes more than a few seconds to download a file, or load a webpage. They expect immediate responses to their emails, and they expect someone to answer their cell phones wherever and whenever they call. Regardless, industrialization resulted in rapid and sustained economic growth and a massive increase in goods; yet, for many people, it created a thoroughly unpleasant and stressful work environment. Also, before the advent of television, cellular phones, and the Internet, people found creative ways to communicate and enjoy time with friends and families. Today, many of these ancient methods embodied by those traditional families have almost disappeared because of the overindulgence in technology. The avid appetite for technology such as phones, iPods, handheld game players and portable computers are consuming people’s time and energy. Rather than interacting face to face with friends, family and acquaintances, people are opting for the convenience of impersonal communication through technology. Many individuals are parallel playing like toddlers, disassociating themselves from others in the creating of uncommitted, emotionless relationships. For a very long time, it has been true that civilization has fashioned weapons of war. Guns, swords, and other weapons exhibited the use of science and technology for military purposes. At the turn of the 20th century, the dangers of these weapons were exposed, and it was evident that they could lead to our planet’s destruction. Nuclear and chemical weapons endanger the planet’s existence every day, and they are a product of science and technology. Clearly, modern science and technology has its fair share of advantages and disadvantages on modern society. From the invention of both simple and complex machines, people have gained a better understanding of the world and how it functions, and have devised innovative means to survive. Advances in the areas of geology and communication are just two areas that reveal the benefits and efficiency of modern technology. On the flip side, civilization has been negatively affected through science and technology because they have been constantly misused. If society would collapse in the future, it is certain that science and technology would play a role in the collapse. It is unclear whether the advantages outweigh the disadvantages, but time will tell the answer.

The Womens Suffrage Movement essays

The Women's Suffrage Movement essays The Womens Suffrage Movement was not only displayed in the United States, but all over the world. Many women took time out of their busy lives just to fight for what they believed in and that was Womens Rights. They just wanted to get the same respect as any other male. Many of the women were well educated and were still denied the right to vote. It took the Womens suffrage Movement many years to make its way through but in 1920 women won voting rights, but were still treated awful and disrespected on their ability to work and etc. this took place well into the 1970s and is still on today it just lighted up. The Womens Suffrage Movement was an outgrowth of the general Womens Rights Movement, which began with The Seneca Falls Convention of 1848. The Convention adopted a Declaration of Principles. The most influential leaders around that time were Susan B. Anthony and Elizabeth Cady Stanton. Elizabeth was also apart of the Anti-Slavery Movement, which also included Lucretia Mott. Elizabeth was well known at the Seneca Falls Convention for an inspiring quote stated, "it is the duty of the women in this country to secure to themselves their sacred right to the franchise." In May of 1869 The National Womens Suffrage Association was formed. Later Lucy Stone and Julia Ward Howe formed that year American Womens Suffrage Association. In 1890 the two organizations decided to merge into National American Womens Suffrage Association (NAWSA). When the two formed Susan B. Anthony soon became the President but retired in 1900. In 1920 the NAWSA was dissolved and replaced by the National League of Wome n Voters, which was established in Chicago, IL. It was thought of to educate women on how to use the newly won vote wisely. The first Political Suffrage was achieved when some states allowed widows to vote in school board elections. Wyo ...

Project Planning & Control - Project Management Coursework

Project Planning & Control - Project Management - Coursework Example The EAC project is viable and is likely to run into specific risks that are not easy to factor into the project management. The same applies with the possible opportunities the project is likely to meet in its course. As such, the Gantt chart will lack the two figures, which are vital since the project managers must always be on the outlook for either the risks or opportunities since they both influence the success of the project. Risks and opportunities are uncertain factors often considered by project managers but they cannot factor in either in the project (Roeser, 2013). The uncertainties in the two arise from the magnitude and nature of their effects on the project. As such, project managers can only anticipate risks and handle them based on the prevailing factors. In retrospect, project management requires a degree of versatility in order to enable the project managers consider the two factors and change the nature of the project based on the influence of either the risks or the opportunities they face at various stages. The Gantt charts alongside show project process. They illustrate the project schedule as different activities occur at various stages. In doing this, he charts show the relationship among the activities. Key among the activities shown in the chart is project preparation and the WBS activities. Additionally, the charts portray the computation of both the pessimistic and optimistic showing their expected start and end

Short Story A short story about somebody who visits their friends Essay

Short Story A short story about somebody who visits their friends house and uses their computer. When their computer breaks down he blames his friend, before realising their was a fault with their computer - Essay Example He repeats this ritual five times. Although he is not a drinker, an insidious hangover would torture him the next morning reminding him of his wasted time after long nights of Internet bingeing. Like most addictions, the rationale for such behavior did not make any sense. Online high school behavior is just as bad as or even worse than high school itself. Online or not, gossip has no face time. Joe barges in with his IPod plugged into his ears and loud as it could be. He is wearing black jeans, a punk-studded belt tilted to the side, and a cap that says KORN. Joe has that hyperactive, ADHD intensity of waiting to entertain. â€Å"Alright look, I swear this is worth it. It’s unlike anything on the Web that is out there. It’s not some lame maze game where the Exorcist girl comes screeching at your screen. It’s no pop up windows full of false-hope million dollar jobs or anything like that.† Joe wears the posterity of a salesman, only he doesn’t have the matching outfit to compliment it. Just as Oscar was about to utter his first response to Joe’s obvious bogus Science Fiction field trip, the monitor shines a bright white that permeates the screen like a soft mist. Then the screen slowly zooms into black. Feeling spooked, Oscar felt an odd inclination to get out of there. Joe nonchalantly follows behind him. The parents weren’t home, so he couldn’t get their help. Oscar opens the door, but it is walled in with bricks. â€Å"Server Error† is chalked on the brick wall. However, they are able to escape through a window. The neighbourhood is not the same. The apartment building looks fragile like cardboard. The street tight ropes into a singularity that Joe or Oscar can’t quite make out. Joe and Oscar walk further down and notice the sides of everything have diminished. It’s a two-dimensional world. Oscar, in disbelief, continues to walk

William A. Shea and His Impact on New York Research Paper

William A. Shea and His Impact on New York - Research Paper Example He was honored by naming the stadium after him, and the team New York Mets played in the stadium for approximately 45 years (Wade 150). Shea had immense political connections as well as money in New York City, he weathered the pressure from the major league owners to come up with the third league after the Giants and Dodgers moved on. William Shea made significant contributions on the New York through making the Continental league a reality in the City. Moreover, Shea was revered for introducing a junior league that promoted the growth of talent in Baseball. Besides his career as a lawyer and huge interests in Baseball. Shea was involved in philanthropic activities. This paper discusses William A. Shea and his contributions toward New York. Discussion William A. Shea was born in Washington Heights in Manhattan on June 21, 1907. Shea attended various public schools after which he studied at New York University on a sports scholarship for basketball. Later, he transferred on another sp orts scholarship to Georgetown University. In 1931, Shea was admitted to the bar at District of Columbia after which he joined the New York bar (Margolick). While in New York University, Georgetown University and Harvard Law School, Shea had a huge interest in Basketball and was a team member in these institutions. Shea graduated from the Harvard law school and worked for insurance bureaucracies after which he entered into private practice. As a lawyer, Shea garnered political influence by working voluntarily on influential boards in Brooklyn. In his legal career, Shea was a lawyer who was trusted by powerful men due to his efficiency (Margolick). Career as a Lawyer Shea held close ties with political bigwigs although he never held an elective office (Margolick). Moreover, Shea was on numerous occasions cited bragging that he had never practiced his profession in a conventional sense. Nevertheless, his career, which spanned for a period of five decades, was a period when Shea became a confidant of mayors, governors and corporate chieftains. These ties enabled him to build Shea & Gould, which is New York’s most influential and largest law firm. Shea and Gould clients included the Apple, The Mets and The Yankees among others. For a large part of his career, Shea maneuvered around banquet halls and boardrooms and was only brought to a public role when the New York Mayor enlisted his help to return the league to its glory (Margolick). Shea obtained New York’s baseball franchise via a combination of street smarts, threats, bluffs and charm that he was particularly suited in given his career as a lawyer, and not as a zealous sports fan. Moreover, his credentials may have been ridden with official appointments, encomiums, affiliations and awards but they omitted his important attribute of bringing people’s interests together (Margolick). Caliendo(2010, 18) highlights that Shea was a power broker with huge experience and spent 40 years turning sit uations facing bankers, realtors, underwriters corporate heads, cement barons, sports impresarios and politicians into profitable cases. Moreover, Shea was labeled as the unofficial chairperson of the unofficial government, who had spent a significant part of his career laboring quietly in political twilight between the public good and private interest. Shea had survived many regimes at the Shea Stadium from the reign of Casey Stengel to the reign of Bud Harrelson and during the opening days of the leagues, he presented a flowery horseshoe to the manager as Mets. Similarly, he survived many political vicissitudes during his career at the City Hall. He became a close confidant of Mayors John Lindsay, Abraham Beame

Ultrasonic transducers

Ultrasonic transducers 1.1 Introduction Transducer is a device which converts energy of one form to that of another. With reference to ultrasonic transducer the ultrasonic energy is to be converted to electrical, mechanical, or other energy form. A reversible transducer transforms energy in both directions with equal efficiencies. The transducers can be classified as follows: 1. Piezoelectric oscillators: Principle of piezoelectric effect is used and this is reversible. The possible frequency range is from 20 kHz to well over 10 GHz. 2. Magnetostrictive oscillators: Employs the phenomenon of magnetostriction, a reversible form of conversion. Can be made to operate at mega-hertz and even gigahertz frequencies. 3. Mechanical transducers: Includes whistles and sirens (mechanical oscillators) and radiometers, and are irreversible. Mainly used for high-power applications. 4. Electromagnetic transducers: Applied for high-intensity applications at low frequencies, in the audible range. They have been used for low-intensity work at frequencies of up to 50 kHz and, also as receivers at megahertz frequencies. 5. Electrostatic transducers: Used as generators at low intensities with an upper frequency limit of a few hundred kilo-hertz. Reversible in conversion and used as receivers at frequencies as high as 100 MHz. 6. Miscellaneous transducers: Includes thermal, chemical, and optical transducers. Ultrasonic receivers are categorized into two 1. Receivers terminating acoustic beams: The cross-section of the receiver embraces the whole or a large proportion of that of the beam and its dimensions extend from several to a large number of wavelengths. The presence of the receiver materially affects the configuration of the acoustic field, to give rise to regular reflections of the beam. 2. Receivers acting as probes: ultrasonic probe receivers are used for mapping out acoustic fields and for measurement of local intensities. the use of probe receivers is restricted to lower frequencies (e.g. in the kilo-hertz range)., as their dimensions need to be small enough, not to upset the characteristics of the field,( to be less than about one-tenth of a wavelength). 1.2 Piezoelectric transducers 1.2.1 General considerations Piezoelectric transducers employ the piezoelectric effect, discovered by the Pierre and Jacques Curie in 1880. The effect occurs naturally in certain single crystals with polar axes, (e.g. quartz, tourmaline, lithium sulphate, cadmium sulphide, and zinc oxide.) When mechanical stress is applied to the surfaces of piezoelectric crystals, coated with silver or gold, equal and opposite electric charges will be induced on them and a voltage will be observed. This is the direct piezoelectric effect, and the crystalline axis perpendicular to the coated faces is the relevant polar axis. When a voltage is applied across the electrodes to produce an electric field, a converse effect is observed, resulting in a mechanical strain. These effects are associated with compressions and shears, in quartz, for example, the principal polar axes are called the X- and Y axes, there is three of each. The X-axes are oriented at angles of 120Â ° apart, and with corresponding Y-axis perpendicular to it. The electrodes lie at right angles to an X-axis for X-cut quartz crystals, and are associated with compressions, and Y-cut quartz crystals with shears. The Z-axis, is known as the optic axis and lies perpendicular to the planes containing the X- and Y-axes. Optic is a non-polar axis for which the piezoelectric effect is not observed. A piezoelectric transducer oscillates at the applied frequency with amplitude of the order of 10-6 times its thickness, on applying an alternating voltage across its electrodes,. If, the transducer is excited at one of its resonance frequencies the amplitude is considerably increased, e.g. to about 10-4 times the thickness at the fundamental frequency Artificially induced piezoelectric transducers are of polycrystalline structure. They are made up of large numbers of minute crystallites bonded together, to the required shape and size. The final product is in the form of a ceramic. Prior to polarisation, these ceramic transducers do not require to be cut with reference to any particular axis, as they are isotropic. So it is possible to have a shape in any convenient form by adding small quantities of other materials, the transducers properties can be improved or adjusted. The piezoelectric effect is measured by the d coefficient, which can be expressed in one or two ways. (i) If the crystal is subjected to a mechanical stress, at the same time, the electrodes are short-circuited by a wire, charges induced by the stress will flow through the wire until the potential difference across the crystal is reduced to zero. Considering, q is the value of the total charge flowing and F the force producing the stress, then d coefficient can be given as d=q/f coulombs per Newton 3.1 (ii) When a voltage V is applied across the crystal, on which no load is applied e.g. vacuum, a displacement l is produced due to the resultant strain, then volts per metre 3.2 The electromechanical coupling coefficient is defined as Both d and k vary with temperature and reduce to zero at the Curie temperature Tc. The frequency response of a transducer depends on its Q factor. If the characteristic impedances of transducer and medium are R1 and R2, then Q can be represented as where K is a dimensionless constant. Ceramic transducers have higher d coefficients and electromagnetic coupling coefficients compared to the quartz crystals. But quartz crystals are highly stable. 1.2.2. Coupling of Piezo electric transducers A suitable liquid must be provided to avoid an air gap , for efficient coupling of ultrasound between the transducer and a solid. To generate longitudinal waves at normal temperatures, a film of oil is usually enough, but, at low temperatures a high-vacuum grease is used to prevent loss of continuity of characteristic impedance. While working with high temperatures, a couplant which does not evaporate, should be chosen. .For transverse wave propagation, it is necessary to use adhesive such as epoxy resin, so as to ensure the couplant has enough strength to withstand the application of the shear stresses without collapsing. Canada balsam or even nail varnish , on some occasions will provide good coupling for shear waves, depending on the temperatures. 1.2.3 Ultrahigh frequency (u.h.f.) piezoelectric transducers An early method of generating u.h.f. ultrasonics was to place one end of a single-crystal quartz rod inside an electromagnetic cavity resonator Ci (see Figure ). The surface was excited at the required frequency, and waves were propagated along the rod. Initially the method was applied only for producing ultrasound in single-crystal quartz , due to difficulty of coupling other materials to the free end of the rod. Another electromagnetic cavity resonator C2 at the other end of the rod acted as a receiver. In later stages the free ends of the rod and solid specimen was coated with thin film of indium. 1.2.4 Piezoelectric sandwich transducers To generate waves at the frequencies ranging from 40 kHz down to 20 kHz.frequency, for High-intensity applications ,with a piezoelectric ceramic, the thickness should exceed 100 mm. A ceramic block of this thickness is both expensive and is highly absorbent. Due to this, absorbed acoustical energy being converted into heat, results in a rapid increase of temperature and the Curie temperature is soon reached, with a consequent disappearance of the piezoelectric effect. To avoid this sandwiching of the piezoelectric transducers can be applied. A sandwich transducer consists of a comparatively thin piezoelectric plate located between two thicker metal plates.They have high compressive strengths and by compressing the sandwich permanently using high tensile bolt damage can be prevented. (see Figure 3.7); the transducer is said to be mechanically biased. 1.2.5 Surface wave piezoelectric transducers Surface waves can be generated by using mode conversion with a longitudinal wave transducer as the primary source, but it is also possible to propagate them directly. Surface waves are produced by placing an ordinary longitudinal wave transducer in contact with the edge of the material and inclined at an angle of 45Â ° (Fig 3.4) and are received in same fashion. Another method of generating and receiving surface waves is by coating two electrodes on the surface of a piezoelectric material and applying the exciting voltage at the required frequency across them (see Figure 3.5). This technique was used for delay line applications 1.2.6 Operation of piezoelectric transducers A quartz crystal mounted at its nodes, is an ideal one for propagating continuous waves over a narrow frequency band. Electrical connections must be made to the electrodes and additional damping caused by them should be kept minimal. Nodal mounting is not advisable for very thin transducers and where contact with a solid medium has to be maintained. For cases like these, the transducer is held in position by means of a light spring against a solid surface. Then the solid surface provides one electrical contact with the transducer electrode and the other is provided by the spring. To have maximum efficiency, the impedances of the exciting and receiving electrical circuits should be correctly matched to the electrical impedance of the transducer. For pulsed wave operation it is essential that the pulses are kept sufficiently short to prevent their overlapping. No stationary waves are to be produced in the medium. To produce very short pulses and where a narrow frequency band is not needed, transducer material, such as a ceramic is used. The transducer is backed by a block of a material having a very high acoustic absorption coefficient and of sufficiently large electrical conductivity to provide contact with that transducer surface. A mixture of tungsten powder and Aroldite is used for this purpose. A high direct voltage (typically from 300 V to 600 V) of instantaneous duration is applied periodically to the transducer electrodes at the required pulse repetition frequency. At each electrical impulse, the transducer experiences a high initial strain after which it oscillates over about two or three cycles, the amplitude decreasing rapidly.. Thus, for a transducer operating at a frequency of 6 MHz to produce pulses each of thre e wavelengths, the pulse duration is about only 0.5ÃŽ ¼ for propagation into most metals. The relation between pulse-length (PL) in seconds and the frequency bandwidth can be given as: PL= 1.3/ Frequency Bandwidth 3.4 1.3 Magnetostrictive transducers Magnetostrictive transducers are made of ferromagnetic materials, which can easily be magnetised and displays magnetostriction or the Joule effect. When a bar or rod of one of these materials is placed in a magnetic field, it suffers a change in length, either an increase or decrease, depending on the nature of the material and the strength of the field, immaterial of the sign of strain. Hence, when the direction of magnetic field is reversed, there is no change in the sense of the strain. Figure 3.11 shows the relationship between mechanical strain and the magnitude of the field strength for a few ferromagnetic materials. The graph imples, the variation is not a linear one, in general. Nickel is found to be the most satisfactory material for magnetostrictive transducers, having an electromechanical coupling coefficient of 31 per cent and a Curie temperature of 358Â °C. Permendur, an alloy, has a higher Curie point (about 900Â °C) and low electromechanical coupling coefficient. Though ferrites (non metals) has an advantage of being poor conductors and not being heated by eddy currents, and exhibit magnetostrictive effect are not often used as transducers due to their poor mechanical properties. There is a converse magnetostrictive effect, in which a mechanical stress applied to a ferromagnetic rod lying in a magnetic field gives rise to a change in the magnetic flux density. This is known as the Villari effect. Magnetostrictive transducers are in the forms of rods surrounded by coil windings (see Figure 3.7). An alternating magnetic field of the same frequency is induced by an alternating current through the coil ; giving rise to longitudinal oscillations of the rod. These oscillations take place at a twice the frequency of the field and take on the form of unsmooth, rectified alternating current, resulting in unwanted frequencies. As in the case of ceramic transducers. This disadvantage is avoided by polarisation, as in ceramic transducers. It is not possible to obtain a high polarising field by permanent magnetisation, and a steady direct field of suitable magnitude is provided by passing a direct current through another coil wound round the transducer. So, the oscillations occur about some other point instead of taking place about the origin of the curve. If the amplitude of the applied alternating field is low for changes to take place along the linear portion of the curve, and, is less than the value of the polarising field, then sinusoidal oscillations occur at the applied frequency. The resonance frequency inversely proportional with the length of the transducer rod. The frequency is increased by decreasing the length, but, simultaneously , there is a intensity is lowered for a rod of given cross-sectional dimensions , which results from the reduction in size of the vibrating mass. So, at frequencies more than 100 kHz ,the output from this type of transducer becomes vanishingly small. The considerable leakage of magnetic flux is observed , which is a disadvantage of using rod-shaped oscillators . Transducers designed to form closed magnetic circuits are used for high-intensity applications The window-type transducer is clamped nodally, and the vibrations produced are longitudinal. In ring-type transducer, vibrations are in a radial manner, and hence ultrasonic energy is focused at the centre resulting in high acoustic intensity. Absorption of ultrasound by induction of Eddy currents and Hystersis results in increased amount of eating. Though there are a number of ferromagnetic materials with low hysteresis losses, their magnetostrictive properties are poor. The losses due to eddy current can be reduced by using laminated stacks consisting of alternating sheets of the metal and of some insulating material such as mica. Since the rise in temperature may result in loss of magnetostrictive properties, it is necessary to cool the transducer during its operation. By using velocity transformer, an increased intensity, distributed over a smaller area, can also be obtained with both rod and window types of transducers. This consists of a tapered coupling rod and provides an increase in the value of the particle velocity at the end remote from the transducer. For maximum efficiency, the transformer is designed to resonate by making it one wavelength long and supporting it at a nodal point, i.e. at a distance of a quarter-wavelength from the transducer. The diagram illustrates the application of the velocity transformer to the construction of the ultrasonic drill Magnetostrictive oscillators being reversible can be used as receivers. An example of a magnetostrictive probe receiver consists of a nickel rod held vertically in a fluid in which ultrasound is radiated in an upward direction. The rod is contained in a plastic tube so that only the free end is exposed to the waves which are then transmitted along its length. A current is induced by the Villari effect in the pick-up coil placed near the upper end of the rod. Another coil carrying a direct current provides the polarising field. The formation of stationary waves is prevented by placing an absorbent material at the top of the rod. Nickel film transducers are used for producing and receiving ultrasound of very high frequencies ranging from 100 MHz to 100 GHz in solids. A thin film of nickel, of thickness corresponding to one half-wavelength at the resonant frequency, is deposited on the end-surface of the specimen into which sound is to be passed. The rod is located with its plated end inside a microwave electromagnetic cavity resonator, excited at the required frequency. The receiver may consist of a similar film coated on the opposite surface of the specimen and also located in a cavity resonator. Instead a single nickel film can act as both source and receiver, using reflection method. No coupling material is required and no special technique is necessary for coating the nickel film. 1.4. Mechanical Transducers Mechanical ultrasonic generators are used for high-intensity propagation in liquids and gases at frequencies of up to about 25 kHz .They exist mainly in the forms of whistles and sirens. They are powerful and less expensive than piezoelectric and magnetostrictive transducers, but with limited scope of applications. Ultrasonic whistles are of two types, the cavity resonator, used mainly for gases, and the wedge resonator, employed for both gases and liquids. . 1.4.1. Cavity Resonators Galton whistle (see Figure 3.12) consists of a cylinder terminated by the end-surface of a piston which can be adjusted to provide resonance at the required frequency The fluid, flows through an annular slit at high speed and strikes the rim of the tube where vortices appear and produce edge-tones. The frequency of the edge-tones depends on the velocity of the fluid which can be adjusted until the cavity resonates. For air, at a frequency of 20 kHz, fundamental resonance takes place for a cavity length of approximately 4 mm. The second type of cavity resonator is the Hartmann generator, similar in design to the Galton whistle, except that the annular slit is replaced by a conical nozzle (see Figure 3.13). The fluid is forced through the nozzle and emerges at a supersonic velocity to produce shock waves, which cause the cavity to be excited at a high intensity. Resonance is achieved by adjusting the fluid velocity. 1.4.2. Wedge Resonator The wedge resonator consists of a rectangular plate with wedge-shaped edges, mounted on nodal supports and placed in a fluid jet stream.(Figure 3.14). The wedge is set up into flexural vibrations having an intensity comparable with that attained by the Hartmann generator. Operating frequencies are of the order of 20 kHz. Sirens also are used for generating high-energy ultrasound in fluids. The siren consists of a rotor disc with a number of identical holes spaced evenly around the circumference of a circle slightly smaller than the disc. The rotor turns concentrically in front of a similar disc (the stator), which is kept at rest whilst fluid jets are directed through the holes. The frequency of the emitted ultrasound is equal to the frequency of interruption of the jet flow, as the holes move relatively to one another, and is calculated as the product of the number of holes in the rotor and the speed of revolution. The tone emitted by the siren is not a pure one but this is unimportant for the applications for which it is used. One advantage of this instrument is that by altering the speed of rotation the frequency can be varied in a continuous manner. The use of mechanical receivers has been restricted to measurements of intensities in liquids and gases. The two principal types of mechanical receivers are the Rayleigh disc and the radiometer. The Rayleigh disc consists of a thin circular disc suspended vertically in the ultrasonic field by means of a torsion fibre. Initially the disc is positioned, with its plane surfaces parallel with the direction of propagation. In the presence of ultrasound, the sound waves exert a couple on the disc, which rotates until brought to rest in a steady position as a result of an opposing couple exerted by the suspension. The angle of rotation required to reach the state of equilibrium depends on the the acoustic intensity. A radiometer is a device which measures directly the pressure of radiation, a quantity which is proportional to the acoustic intensity. The simplest form of radiometer is a tiny solid sphere suspended in the sound field. It is deflected horizontally in the direction of propagation when the ultrasound is present. The device is calibrated by subjecting it to known fluid pressures and then measuring the resulting displacements. The torsion balance radiometer is designed for waves travelling in a horizontal direction and the common balance type for vertically directed waves(Fig 3.15 a and Fig 3.15b) 1.5 Electromagentic Transducers A lightweight electromagnetic transducers have been used for low-intensity ultrasonic measurements in poorly conducting solids and liquids. But the method requires constant application of a steady magnetic field m which is a major disadvantage 1.5.1. Giacominis method: A bar of poorly conducting solid is coated with a thin conducting strip of negligible mass over opposite halves of the upper and lower surfaces and the end-face. It is supported horizontally at the nodal positions by electrically conducting wires, and the coated end is subjected to a horizontal magnetic field at right angles to the axis. When an alternating current is passed through the conducting strip, the bar vibrates longitudinally, in accordance with Flemings left-hand rule of electromagnetism. Because electromagnetic transducers are reversible, vibrations in the bar are picked up by the conducting strip which, in the presence of a steady magnetic field, will have induced in it an alternating e.m.f. in accordance with Flemings right-hand rule of electromagnetism. This e.m.f. is related to the acoustic intensity. Thus the device can be used as both a transmitter and a receiver of ultrasound. 1.5.2. Filipczynskis Method: An aluminium film in the form of a continuous and winding narrow strip is evaporated on to a perspex block to provide a coil of negligible mass. The block is then immersed in the liquid and located inside a gap between the pole-pieces of a permanent magnet which supplies a steady magnetic field of high intensity. Ultrasonic waves pass from the liquid into the block, giving rise to oscillations of the aluminium coil which induce in it an e.m.f. related to the intensity in the block. 1.6 Electrostatic transducers An electrostatic transducer consists essentially of two parallel plates of a conducting material placed close to one another to form an electrical capacitor. One plate is fixed and the other is free to vibrate in a direction at right angles to the surface of the plates. A high resistance is placed in series with the capacitor and steady charges on the plates maintained by a direct potential difference of several hundred volts (Fig 3.18). For operation as a transmitter, a signal at the desired frequency, is fed to the plates , output voltage of amplitude not exceeding the direct potential difference. The periodic variation of the charges induces vibrations of the movable plate. For use as a receiver, the movable plate is placed in position to receive the sound waves and its consequent vibrations give rise to periodic variations of the electrical capacitance of the transducer, producing an alternating current which flows through the high resistance; the resulting alternating voltage proportional the intensity of the received sound. The electrostatic transducer in the form of the condenser microphone has long been used at audible frequencies. Diaphragm being light , inertial effects are negligible and the sensitivity remains constant over a wide frequency range. It can be used for gases and liquids as both a receiver and a transmitter at frequencies of up to about 300 kHz. 1.7 Miscellaneous Transducer Other methods of generating and receiving ultrasound involve the uses of thermal, chemical, and optical devices. The chemical changes observed in materials irradiated with ultrasound, is used as a means of detection. It is also possible to generate ultrasonic waves in a transparent medium by the crossing of two laser beams originating from a common source. There are a number of applications which make use of thermal transducers. One thermal type of transmitter is the spark-gap generator, which radiates ultrasound as a result of periodic temperature changes taking place when a high alternating voltage of a given frequency is discharged across a gap in a circuit. The hot-wire microphone, is a receiving thermal transducer,consisting of a thin wire, made from platinum and heated to just below redness. When sound waves strike the wire, it cools down by an amount directly dependent on the intensity. This is indicated by a decrease in its electrical resistance. The hot-wire microphone has been used successfully for gases at frequencies of up to 600 kHz. Ultrasonic intensities can also be measured from the rise in temperature within the beam, as shown in Figure 3.19. The heat produced by the ultrasound is absorbed by the liquid in the thermally insulated flask. Expansion of the liquid results in a rise in the level of the liquid in the graduated capillary tube, calibrated by supplying a measured amount of heat from the heating coil. The waves transmitted through the liquid are finally absorbed by the glass wool placed at the end of the vessel. Acoustic powers of from 50 mW to 30 W can be measured to an accuracy of better than 10 per cent with this device.

The Abolition of Man by C.S. Lewis Essays -- Lewis Abolition of Man Es

The Abolition of Man by C.S. Lewis      Ã‚  Ã‚  Ã‚  Ã‚   The Abolition of Man is perhaps the best defense of natural law to be   Ã‚  Ã‚  Ã‚  Ã‚   published in the twentieth century. The book is outstanding not because   Ã‚  Ã‚  Ã‚  Ã‚   its ideas are original, but because it presents so clearly the common   Ã‚  Ã‚  Ã‚  Ã‚   sense of the subject, brilliantly encapsulating the Western natural law   Ã‚  Ã‚  Ã‚  Ã‚   tradition in all its Greco-Roman and Judeo-Christian glory. Interestingly,   Ã‚  Ã‚  Ã‚  Ã‚   Lewis' defense of objective morality here resonates not only with ideas   Ã‚  Ã‚  Ã‚  Ã‚   from the giants of Western thought (including Plato, Aristotle, Augustine,   Ã‚  Ã‚  Ã‚  Ã‚   and Aquinas), but also draws on the wisdom of the East, including Confucius and the sages of Hinduism.      Ã‚  Ã‚  Ã‚  Ã‚   In "The Abolition of Man" C.S. Lewis developed three lectures entitled   Ã‚  Ã‚  Ã‚  Ã‚   "Men without Chests'', "The Way", and "The Abolition of Man". In them he   Ã‚  Ã‚  Ã‚  Ã‚   set out to attack and confute what he saw as the errors of his age.   He   Ã‚  Ã‚  Ã‚  Ã‚   started by quoting some fashionable lunacy from an educationalists'   Ã‚  Ã‚  Ã‚  Ã‚   textbook, from which he developed a general attack on moral subjectivism.   Ã‚  Ã‚  Ã‚  Ã‚   In his second lecture he argued against various contemporary isms, which   Ã‚  Ã‚  Ã‚  Ã‚   purported to replace traditional objective morality. His final lecture,   Ã‚  Ã‚  Ã‚  Ã‚   "The Abolition of Man", which also provided the title of the book   Ã‚  Ã‚  Ã‚  Ã‚   published the following year, was a sustained attack on hard-line      Ã‚  Ã‚  Ã‚  scientific anti-humanism.      Ã‚  Ã‚  Ã‚  Ã‚   The first essay, "Men without Chests," indicted the modern attempt to   Ã‚  Ã‚  Ã‚  Ã‚   debunk objective virtues and sentiments. According to Lewis, traditional   Ã‚  Ã‚  Ã‚  Ã‚   moral theorists believed that virtues such as ... ...world, by   Ã‚  Ã‚  Ã‚  Ã‚   the dictates of conscience and by the constituted order of things in   Ã‚  Ã‚  Ã‚  Ã‚   nature. That is why, all that being so, "we have cause to be uneasy",   Ã‚  Ã‚  Ã‚  Ã‚   because faced with this Law (Tao) of God, with Absolute Goodness, and   Ã‚  Ã‚  Ã‚  Ã‚   demands therein, we see we that we have "all sinned and come short of the   Ã‚  Ã‚  Ã‚  Ã‚   glory of God" (Romans 3:23).      Ã‚  Ã‚  Ã‚  Ã‚   When we take some time to ponder the meanings of The Abolition of Man and   Ã‚  Ã‚  Ã‚  Ã‚   its writings, we see that Lewis' essays were not new ideas at all.   In the   Ã‚  Ã‚  Ã‚  Ã‚   contrary, they were reminders of what man has intrinsically known since   Ã‚  Ã‚  Ã‚  Ã‚   the beginning of time.   As Samuel Johnson once said, 'Man is in need more   Ã‚  Ã‚  Ã‚  Ã‚   frequently of being reminded than informed.' Works Cited: Lewis, C. S. The Abolition of Man. Ontario: The MacMillan Company, 1947.

Right To Education

The right to education is a universal entitlement to education, recognized in the International Covenant on Economic, Social and Cultural Rights as a human right that includes the right to free, compulsory primary education for all, an obligation to develop secondary education accessible to all, in particular by the progressive introduction of free secondary education, as well as an obligation to develop equitable access to higher education, ideally by the progressive introduction of free higher education. The right to education also includes a responsibility to provide basic education for individuals who have not completed primary education. In addition to these access to education provisions, the right to education encompasses the obligation to rule outdiscrimination at all levels of the educational system, to set minimum standards and to improve quality of education.International legal basisThe right to education is a law in Article 26 of the Universal Declaration of Human Rights and Articles 13 and 14 of the International Covenant on Economic, Social and Cultural Rights.[1][2][3] The right to education has been reaffirmed in the 1960 UNESCO Convention against Discrimination in Education, the 1981 Convention on the Elimination of All Forms of Discrimination Against Women,[4] and the 2006 Convention on the Rights of Persons with Disabilities[5] In Europe, Article 2 of the first Protocol of 20 March 1952 to the European Convention on Human Rights states that the right to education is recognized as a human right and is understood to establish an entitlement to education.According to the International Covenant on Economic, Social and Cultural Rights, the right to education includes the right to free, compulsory primary education for all, an obligation to develop secondary education accessible to all in particular by the progressive introduction of free secondary education, as well as an obligation to develop equitable access to higher education in particular by the progressive introduction of free higher education.The right to education also includes a responsibility to provide basic education for individuals who have not completed primary education. In addition to these access to education provisions, the right to education encompasses also the obligation to eliminate discrimination at all levels of the educational  system, to set minimum standards and to improve quality. The European Court of Human Rights in Strasbourg has applied this norm for example in the Belgian linguistic case.[4] Article 10 of the European Social Charter guarantees the right to vocational education.[6]DefinitionEducation narrowly refers to formal institutional instructions. Generally, international instruments use the term in this sense and the right to education, as protected by international human rights instruments, refers primarily to education in a narrow sense. The 1960 UNESCO Convention against Discrimination in Education defines education in Article 1(2) as: â€Å"all types and levels of education, (including) access to education, the standard and quality of education, and the conditions under which it is given.† In a wider sense education may describe â€Å"all activities by which a human group transmits to its descendants a body of knowledge and skills and a moral code which enable the group to subsist†.In this sense education refers to the transmission to a subsequent generation of those skills needed to perform tasks of daily living, and further passing on the social, cultural, spiritual and philosophical values of the particular community. The wider meaning of education has been recognised in Article 1(a) of UNESCO's 1974 Recommendation concerning Education for International Understanding, Co-operation and Peace and Education relating to Human Rights and Fundamental Freedoms. Someone has rightly said that If someone is going down the wrong road, he doesn’t need motivation to speed him up. What he needs is education to turn him around.

Among the hidden–Reader’s report

Bolometer The book I read is Among the hidden Which is wrote by Margaret Peterson Haddam. This book was published by Simon & Schuster Children's Publishing in 1998. It is a science-fiction book Which has about 150 pages. My first impression of this book is that it is a sad story because the cover page is made up by cool tone. The story happens in the future which starts with Lake's birthday in Lake's home.With a new housing development replacing the woods next to his family farm, he is no longer allowed to go outside. There is a law about each family can only have tow children. Luke has lived his entire life in hiding because he is a shadow child, a third child forbidden by the population police. Luke admires his brothers so much because they can go to school and play with friends out side. This setting makes me feeling mysterious and depressive. Until one day, he find out there is an other shadow child in his neighbor's family.She is Jean, the creator of a chat room for shadow child ren chatting with each other. They become friends soon after they meet. Jean organizes a rally Which hundreds of shadow children are going to protest the government's population law, but Luck does not participate in the rally that day because of fear. After the rally day, Luck can not contact with Jean for a week. He is so anxious that he breaks in Jean's house. He meets Jean's dad in the house who tells him a appealing news Jean and other shadow children were killed by population police.Then, Jean's dad helps Luck escaping from population police' chase. Finally, they achieve to make a fake I. D for Luck. On this story, the main conflict is person versus society. All the shadow children are illegal, but they never stop the struggle for freedom. The two main character for the story are Luck and Jean. Luck is a small-bone and soft looking boy. Firstly, I think he is an obedient boy. He never disobey his parents' order about hiding. He does not ask much about why he have to hid even he is very unwilling to do that.Secondly, he is a person of perseverance. He observe his neighbors every day. So he can know each of his neighbors. And that's why he can find out Jean when he saw the light in her home after all her relatives are going out. Jean is the most impressive person I have read in this story. She is slim and has a short hair. She is so courageous that she organizes the rally at the risk of her life. And she is really decent that she wants all the shadow children have the same right with the normal people. She is dead because of trying to protest the totalitarian government.In my opinion, the reason author write this book is to tell the children how blessedness they are now. Comparing with these shadow children who are not accepted by the society, we are really lucky. This book make me occurring to China. China is a country have that population law, but not as serious as the book describes. The family who have more children in China have to pay a fine. That tel ls us each thing has its limit. If the overspent is so strict at population law, it will be a tragedy for someone.If the government do this reasonable, it will be a good thing to everyone. The major strength for reader to read this book is that the poll is very suspenseful Which you will never know what are going to happen. The weakness is that it is a sad story. Jean is dead at the end, it does not make reader feeling happy. I will recommend this book to my friends because it can tell them to treasure their life. I think if a person feels lonely and reactive by society, he can resonate with the children in the book and he will like this book.

The communications media used in the educational system The WritePass Journal

The communications media used in the educational system 1. Executive Summary The communications media used in the educational system 1. Executive Summary2. Introduction  3. Communication3.1. One way communication and two way communication. 3.2. Verbal and non verbal 4. The means of communication in the educational system5. E-learning5.1. Blended-Learning5.2. Distance courses5.2.1 E-learning synchronous and asynchronous 5.2.1.1Synchronous5.2.1.2. Asynchronous5.3. Advantages and disadvantages of e-learning compared to traditional methods 5.3.1. Advantages5.3.1.1. Reducing the Impact on EnvironmentThere is no need of traveling; resulting in diminution of pollution reduces the use of papers thereby contributing to the environment 5.3.1.2. Quality education affordable5.3.1.3. Convenience and flexibility for the student 5.3.2. DisadvantagesAccording Remenyi (2005), the three major disadvantages related to the E-learning is the lack of interaction between student and teacher, the lack of interaction between students and the need for basic computer skills. 5.3.2.1. Lack of interaction between student and teacher 5.3.2.2. Lack of interaction between students5.3.2.3. Need for basic computer skills6. ConclusionRelated 1. Executive Summary This report examines the means of communication at universities. A brief definition of communication will be given initially, followed by a description of the means of communication currently used in universities. The report then focuses on e-learning, examining the method and the blended distance course. Within the distance course will examine the synchronous and asynchronous method. So those will be presented this vantage and disadvantage of e-learning compared to the traditional teaching method, being concluded that the e-learning is essential to the educational system and recommended the implementation of distance education at University of Westminster 2. Introduction The communications media used in the educational system has been suffering major changes in recent times. The traditional method has been complemented or even replaced many times by the current method where e-learning has been outstanding. E-learning can bring great benefits to the educational system, complementing or being another option for those who do not have the opportunity to attend the traditional method. The aim of this report is to examine the communication system used on the educational system is special on higher education, focusing on the e-learning method. Firstly, it will talk about the means of communication, secondly the traditional teaching method, third on the e-learning and finally will present the advantages and disadvantages of e-learning compared to traditional teaching methods.   3. Communication The definition of Communication is given by Collins English Dictionary (2009) as the exchange of information, ideas or feeling.† Communication can be classified and divided in different ways. According to Gallegher (2010), communication can be one-way or two way communication; verbal and non verbal, and also says that the communication can be inter or intra communication. 3.1. One way communication and two way communication. One way communication occurs when there is no feedback or interaction during the communication. Two way communication occurs when the recipient asks clarification and interacts with the sender 3.2. Verbal and non verbal The verbal communication occurs when there is the use of words and can be written or spoken. Examples of written communication are: newspapers, posters, advertisements, books, while some examples of spoken communication are: speeches, discussions, lectures and presentations. Non-verbal communication uses other means that is not through writing or speaking, such as facial expression and body language. 4. The means of communication in the educational system The means of communication used in the educational system has been through major transformations following the technological advancement. According to An evaluation of students, the traditional method of teaching in the UK and in most of the world is characterized by one-way transmission from the lecture to the student, which refers to the teacher-center model of teaching, where information is transmitted to the students through the knowledge of the teacher, without much questioning by the student. However, this method has been changed, and the aim of the educational system has been supporting the activities of students rather than simply convey information.   According to Gibbs (1995:1) student-centered method, encourages â€Å"learner activity rather than passivity; students experience on the course, outside the institution-and prior to the course, process and competence, rather than the content where key decisions about learning are made by the student through negotiation with the teacher . The growth of this new method of teaching has as a major factor, the implementation of e-learning by higher education institutions. 5. E-learning According to Clarke (2004), E-learning is a general term that covers different methods which have in common the use of Information and Technology of communication, and may be as a complement to a traditional course as well as an online course where teachers and students do not meet. The term e-learning is the result of a combination occurring between the educations with the help of technology. The e-learning added new meaning to apprenticeship and blew up the possibilities in disseminating of knowledge and information to students and, at a fast pace, opened up new horizons for the distribution and sharing of knowledge, making it also a form of democratization of knowledge for the layers of the population with access to new technologies, giving them the knowledge available, anytime and anywhere. With the development of web technology, the processes of interaction in real time became a reality, allowing to the student to have contact with knowledge, with the teacher and other students, through the media technological 5.1. Blended-Learning This is a new method that has been growing in popularity, which is based on e-learning as a complement to studies in the classroom. Clarke (2004:120), defines blended learning as the integration of e-learning approaches with more traditional methods†. As an example of this method we can mention the Blackboard used by universities. 5.2. Distance courses The training and continual updating of knowledge and skills of human resources are now a crucial element to achieve an effective and efficient performance. The application of information technology and communication to the area of training led to the creation of a new mode of apprenticeship: the distance course. According to Mealy and Loller (2000), Distance Education (DE) occurs when education is provided without the student and the institution being on the same physical location.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   With the distance course the student starts to having time to learn at their own pace, with the assistance of a tutor, without losing the ability to interact with other course participants. 5.2.1 E-learning synchronous and asynchronous 5.2.1.1Synchronous There are two distinct ways of teaching through distance learning: Synchronous and Asynchronous. Synchronous is when teacher / tutor and student / trainees are in lesson to the same time. Can be cited as an example of resources synchronous phone, chat, video conferencing and web conferencing. Through web conferencing, the teacher ministers the classes and students can hear the contents transmitted by the teacher. Thus, students may also ask questions and discussions. This is the model that most closely resembles the traditional teaching. The concept of classroom is extended to distance learning through the use of technology.† Mealy   and Loller (2000:20) 5.2.1.2. Asynchronous In asynchronous e-learning, teacher and students are not in class to the same time. According to Mealy and Loller (2000), the main feature of this method is that the student can participate in the study schedule that suits you. The teacher also is not limited to a specific schedule and can answer questions or participate in discussions at different times of the student. The big difference in asynchronous e-learning is that time is elastic giving greater flexibility to the students in their learning, research and study. 5.3. Advantages and disadvantages of e-learning compared to traditional methods 5.3.1. Advantages According to Remenyi (2005), the three main benefits of e-learning are: Reducing the impact on the environment, quality education affordable and Convenience and flexibility for the student 5.3.1.1. Reducing the Impact on Environment There is no need of traveling; resulting in diminution of pollution reduces the use of papers thereby contributing to the environment 5.3.1.2. Quality education affordable Through e-learning, great teachers can share their knowledge without physical barriers, political, or economic, thus reducing the cost of education making it more affordable, The student can study at a respected university, out of state or even country, e-learning takes the social and physical barriers by giving everyone the same level 5.3.1.3. Convenience and flexibility for the student The materials are more accessible, depending on the method, can be available 24 hours 7 days a week, with no need for change in lifestyle. The student has the opportunity to create a personalized pace. 5.3.2. Disadvantages According Remenyi (2005), the three major disadvantages related to the E-learning is the lack of interaction between student and teacher, the lack of interaction between students and the need for basic computer skills. 5.3.2.1. Lack of interaction between student and teacher The tutor has a higher difficulty in judging the level of acceptance, understanding and retention, since it is not possible an immediate response from the student. There is a need for a higher level of motivation and higher autonomy of learning than classroom training 5.3.2.2. Lack of interaction between students Depending on the method used e-learning, such as the course distance, because there is no participation in the classroom, there is no socialization among students, which can lead to negative outcomes such as lack of ability to work as a team. 5.3.2.3. Need for basic computer skills Need some experience in using computers and Internet usage, also some appetite for the use of technology 6. Conclusion With the increasingly widespread use of new information technologies and communication, it becomes essential the adoption of these in the teaching and apprenticeship. The process that performs this learning environment is called e-learning. In eLearning, flees to the traditional model of teaching, the learning process is student centered, which can build its self-education course, interacting with the available content according to their learning needs in a way flexible, how, when and wherever you want, being the teacher / trainer the catalyst developing this process. In eLearning, the papers the teacher / trainer and school / university are not being replaced. What changes is its function, no longer educational agents, to be partners in apprenticeship. Therefore personal contact is not unappreciated, but become more interesting.

PERSONAL GOALS & REFLECTION ASSIGNMENT BUSINESS ETHICS Essay

PERSONAL GOALS & REFLECTION ASSIGNMENT BUSINESS ETHICS - Essay Example After evaluating my time audit sheet, I can say with confidence that I am maintaining the values that matter to me in my daily activities. The two most important influences in my life are religion, and education, and so it is appropriate that related activities (class, study, and prayer) occupy the majority of my days. I would not change any aspect of the way I fill these time periods, except for extending them if it were a realistic option. If I were conducting myself as a business with the values equivalent to those described in the memorandum, then the usage of my time is very efficient. It promotes the building of personal skills, spiritual health, social activity, and a very productive, happy life. Of course, some play time does creep into my days, but it is a necessary release of stress that surely contributes to my success during the day. I wouldnt expect my employees to spend their entire day without any fun. It would surely exhaust them in a short amount of time. If I were to make a single change to my routine, I would try to eliminate about an hour from my night of sleep. There has been evidence that seven hours or even less can be more than sufficient for some people, and the extra time could certainly be used for a more productive purpose. Though sleep is definitely important, I would be interested to see if I can be awake for longer without a major negative impact to daily

Cambodia Essay Example | Topics and Well Written Essays - 1250 words

Cambodia - Essay Example This is what will be dissertated in the following. One of Cambodia's major natural resources is its forests, but illegal logging has severely hurt this industry. Both the environmental groups Global Witness and Friends of the Earth have collected videotape testimony of logging officials admitting to the illegal exportation of timber. Vietnam stated that the government "firmly respects the forestry policy of Cambodia and has advised all provinces and competent authorities to carry out the Vietnamese Prime Minister's order to ban logging exports to Vietnam." (Vietnamese 'Furniture' Plundered from Cambodian Forests, p.2). The issue of deforestation in Cambodia is a major one, not only because of the fact that their forests are one of their major natural resources, but also because the act of deforestation takes away from another problem they are experiencing, which is wildlife extinction. Many measures have been taken in an attempt to at least cut down the element of deforestation, considering how terribly damaging it is to Cambodia as a whole. In February of 1999, the Prime Minister of Cambodia even tried to pass measures to crack down on illegal logging, and as well he asked for donors to give money in order to help protect the forests. "But despite the measures taken and an estimated 1.3 billion dollars in aid, Global Witness says that the illegal logging and exportation continue." (Leggett, n.d.). The root cause of the deforestation which is taking place in Cambodia seems most likely to consist of many elements. Not only a combination of governmental mismanagement and corruption and economic development, but also the ever-widening gap between classes continue to cause deforestation across Cambodia. The significance of forests both for their natural resources as well as for their innate beauty continues to decline, and environmental protection remains undervalued. Although there is not one sole cause, the element of guerilla factions can for the most part be considered as the root cause of Cambodia's deforestation. In regards to these guerilla factions, we are speaking namely of the Party of Democratic Kampuchea or Khmer Rouge. "During the Cambodian conflict, guerilla factions and the State of Cambodia used logging to finance their war efforts. The SOC exported timber to Thailand. Thailand depended on neighboring countries like Cambodia for timber as it had to adhere to a 1989 logging ban." (Think Quest, 2005). Another major environmental problem in Cambodia is that of their wildlife extinction dilemma. This issue includes the wildlife of many different species, including the freshwater dolphin. Wildlife preservation officials are extremely worried that Cambodia's rare freshwater dolphin species will be extinct in the next 10 years; with most of these dolphins dying in fishing nets. Studies have shown that an estimated 10 dolphin calves are born a year, but Fisheries Department data shows that 14 died in 2003, 18 in 2004 and 13 in 2005. Tourism Ministry Secretary of State Thong Khon said the ministry has begun patrols along the river and is further investigating the reasons behind the deaths of the dolphins to prevent their extinctions. Hunting is widely considered to be the greatest immediate threat to wildlife in the Dry Forests, as well as throughout the rest of Cambodia. Although people primarily hunt for