Urban forestry status of China Research Paper Example | Topics and Well Written Essays - 1250 words

Urban forestry status of China - Research Paper Example What is perhaps more disturbing is the fact that the people engaged in the destruction of forest lands for private and commercial economic construction see the latter as the most ideal definition of development for China (Konijnendijk, 2007). Consequently, the need for an urgent step to control the rate at which the beautiful green rain forest that nature gave to the people of China is being destroyed has been totally lost. As a result, China is now a victim of greenhouse gas emission, environmental warming and a very poor climate system that has made agriculture very difficult (Gao, 2003). To understand the state of urban forestry in China, the researcher will make use of document review method, which will entail a critique and review of various works of literature pertaining to the area of study. To do this effectively, there will be the construction of a literature log, which will comprise major themes about the study area where the researcher wants information. The literature log will therefore serve as the major material with which data will be collected for the study. The advantage that the literature log and the document review method offer is that it puts virtually no restriction on the researcher in terms of data collection. This means that the researcher can be as wide with data collection as possible. In this context however, an inclusion and exclusion criteria were set, defining the types of literature to include. For example, sources were to have been published not earlier than 2000. They should have been published in either Chinese or English, and they sh ould have a direct relation to urban forestry. Indeed, as people have a new desire for urbanization that is seen as the source of personal and national economic development, the most immediate action they are most likely to be engaged in is the felling of trees that made up the beautiful Chinese forestry canopy (Chinese Academy of Forestry Sciences & Huadong Normal

Civil Disobedience Essay Example for Free

Civil Disobedience Essay Based on the writings of Henry David Thoreau it is very relevant that he is very opposed to government involvement of any kind. He doesn’t believe that the government should be involved in everyday life. Thoreau doesn’t understand the point of having a government system that will be useful to everyone and not just a select few. Thoreau proceeds to explain his many reasons as to why the â€Å"government is best [when it] governs [the] least.† He thought people should stand up to the very ones that made society so corrupt and weak. Thoreau believes the government puts personal selfish interests on a pedestal. Thoreau’s opening statement set the tone for his entire essay. He begins his essay by saying that the government, so far, has rarely proven to be useful. He believes that the power the government has derived from the majority rather than the few. This is mainly because the majority is the strongest group not because their viewpoint is right but because they have many in numbers. He then continues to express the fact that many people do what they believe is right and not to just follow the law created by the majority. He insists that people should do away with the law all together when the legal system becomes unjust. Thoreau then states that the United States is a perfect example of an unjust government. He believes that is because of the fact that they have shown support of slavery and they have participated in the practice of aggressive war. In regards to a man following his first obligation, Thoreau believes that a man isn’t obligated to get rid of the evils of the world, but he is obligated not to take part in these evils. This means that no man should feel the need to participate in an unruly government if he does not choose to do so. Thoreau asks, â€Å"Must the citizen ever for a moment, or in the least degree, resign his conscience to the legislator? Why has every man a conscience, then? I think we should be men first, and subjects afterward.† He is basically stating that it is far more important to develop respect for what is right, rather than a respect for law. Thoreau sets a very powerful and aggressive tone by choosing to open his essay this way. Thoreau doesn’t see the effectiveness of reform within the US government. Thus, he wants his readers to feel the same way. He then says that he is convinced that petitioning and voting for change achieves very little. Thoreau uses a wide variety of examples, some personal, that depict the unjust system that he discusses. By using his own personal experiences, he is allowing the reader to fully understand everything he is trying to depict. He speaks on the fact that during a protest against slavery, he refused to pay the taxes that were issued to him. Because of his refusal to pay the taxes, he spent the night in jail. But, overall his thoughts and opinions dissociated him from the government because he chose not to participate in its institutions. He then states that one can’t see the government for what it really is because one is still working within it. And, in this way they believe that everything is justified because they are a part of the strong majority. He feels that having too much respect for law causes people to do wild things. For example, he believes that the government has turned soldiers into machines for their own personal use making them a shadow of what is real. Thoreau is very passionate and honest about everything that he says. He wants the reader to know exactly where in his heart these words are coming from. He never uses a harsh syntax or diction when writing because he doesnt want to sound angry. Throughout his essay, Thoreau uses an intense appeal to pathos. He mostly uses pathos when he describes a conversation with his cell mate. Thoreau asks his fellow prisoner what he got put in jail for and the man replied saying, they accuse me of burning a barn; but I never done it. Thoreau does this to appeal to the emotion of his readers by showing them that what the government does isnt fair. He also shows this when he says that he has been waiting 3 months for his trial, and he will probably have to wait another 3 months before he actually gets his trial. Thoreau describes the conversation to paint a picture in the minds of his readers, of an innocent man that had to wait a half a year to attempt to prove innocence. The fact that this innocent man was spending his waiting time in jail, draws a lot of sympathy from his readers. Thoreau also uses a great deal of imagery in this essay. When describing his  jail cell, he used the rooms were whitewashed once a month He was doing this to show his audience that his punishment really wasnt as bad as most people thought it would be. Thoreau even said that he viewed his cell almost as if it were an apartment, and the jail house, a city. This supports his idea that jail technically isnt a punishment for those in it. Thoreau, here, is trying to persuade the readers to stand together and revolt against the government because it is their duty to do so. He then goes on to say that neither him, nor his cell mate pose any real threat to society. This makes the reader question his place in jail. If he really wasnt a threat, then why was he locked up? Thoreau is very opinionated about his very broad views of the government. He believes that the government has only lasted this long because people refuse to execute their own will. And, until this happens, no changes will ever be made. Thoreau wishes for a society in which man makes decisions of his own mind and not the mind of those that are trying to suppress the truth. In some aspects Thoreau is right. Some current laws are not honorable. Overall, Thoreau just wants to conform to the laws set in place, but he feels that that phenomenon won’t happen. In his essay, Thoreau makes it very clear of his idea that government is best [when it] governs [the] least. He uses many rhetorical strategies such as imagery, symbolism and pathos as an effort to persuade the readers that the best kind of government is one of laissez-faire. His main ideas were present in his writing. He wanted to show people that a hands-off government is not the best thing for everyone. Because if he was thrown in jail for one night due to the fact he didnt pay poll tax for six years, then why dont people step up and revolt against the government? He wanted the reader to feel empowered by his words so that there could truly be a change in government policies.

Light Emitting Diode | Dissertation

Light Emitting Diode | Dissertation Introduction Alight-emitting diode(LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across thevisible, ultraviolet and infrared wavelengths, with very high brightness. When a light-emitting diodeis forward biased (switched on), electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is calledelectroluminescenceand thecolorof the light (corresponding to the energy of the photon) is determined by the energy gap of the semiconductor. An LED is often small in area (less than 1mm2), and integrated optical components may be used to shape its radiation pattern.LEDs present manyadvantagesover incandescent light sources includinglower energy consumption, longerlifetime, improved robustness, smaller size, faster switching, and greater durability and reliability. LEDs powerful enough for room lighting are relatively expensive and require more precise current andheat managementthan compactfluorescent lampsources of comparable output. Light-emitting diodes are used in applications as diverse as replacements foraviation lighting,automotive lighting(particularly brake lamps, turn signals and indicators) as well as intraffic signals. The compact size, the possibility of narrow bandwidth, switching speed, and extreme reliability of LEDs has allowed new text and video displays and sensors to be developed, while their high switching rates are also useful in advanced communications technology.InfraredLEDs are also used in theremote controlunits of many commercial products including televisions, DVD players, and other domestic appliances. History Discoveries and early devices Green electroluminescence from a point contact on a crystal ofSiCrecreatesH. J. Rounds original experiment from 1907. Electroluminescenceas a phenomenon was discovered in 1907 by the British experimenterH. J. RoundofMarconi Labs, using a crystal ofsilicon carbideand acats-whisker detector.RussianOleg Vladimirovich Losevreported on the creation of a first LED in 1927.His research was distributed in Russian, German and British scientific journals, but no practical use was made of the discovery for several decades. Rubin Braunstein of theRadio Corporation of Americareported on infrared emission fromgallium arsenide(GaAs) and other semiconductor alloys in 1955.Braunstein observed infrared emission generated by simple diode structures usinggallium antimonide(GaSb), GaAs,indium phosphide(InP), andsilicon-germanium(SiGe) alloys at room temperature and at 77kelvin. In 1961, American experimenters Robert Biard and Gary Pittman working atTexas Instruments,found that GaAs emitted infrared radiation when electric current was applied and received the patent for the infrared LED. The first practical visible-spectrum (red) LED was developed in 1962 byNick Holonyak Jr., while working atGeneral Electric Company.Holonyak is seen as the father of the light-emitting diode.M. George Craford,a former graduate student of Holonyak, invented the first yellow LED and improved the brightness of red and red-orange LEDs by a factor of ten in 1972. In 1976, T.P. Pearsall created the first high-brightness, high efficiency LEDs for optical fiber telecommunications by inventing new semiconductor materials specifically adapted to optical fiber transmission wavelengths. Until 1968, visible and infrared LEDs were extremely costly, on the order of US $200 per unit, and so had little practical use.TheMonsanto Companywas the first organization to mass-produce visible LEDs, using gallium arsenide phosphide in 1968 to produce red LEDs suitable for indicators. Hewlett Packard(HP) introduced LEDs in 1968, initially using GaAsP supplied by Monsanto. The technology proved to have major uses for alphanumeric displays and was integrated into HPs early handheld calculators. In the 1970s commercially successful LED devices at fewer than five cents each were produced by Fairchild Optoelectronics. These devices employed compound semiconductor chips fabricated with theplanar processinvented by Dr. Jean Hoerni atFairchild Semiconductor.The combination of planar processing for chip fabrication and innovative packaging methods enabled the team at Fairchild led by optoelectronics pioneer Thomas Brandt to achieve the needed cost reductions. These methods continue to be u sed by LED producers. History Of LEDs and LED Technology Light Emitting Diode (LED) Light Emitting Diode (LED) is essentially a PN junction semiconductor diode that emits a monochromatic (single color) light when operated in a forward biased direction. The basic structure of an LED consists of the die or light emitting semiconductor material, a lead frame where the die is actually placed, and the encapsulation epoxy which surrounds and protects the die (Figure 1). The first commercially usable LEDs were developed in the 1960s by combining three primary elements: gallium, arsenic and phosphorus (GaAsP) to obtain a 655nm red light source. Although the luminous intensity was very low with brightness levels of approximately 1-10mcd @ 20mA, they still found use in a variety of applications, primarily as indicators. Following GaAsP, GaP, or gallium phosphide, red LEDs were developed. These devices were found to exhibit very high quantum efficiencies, however, they played only a minor role in the growth of new applications for LEDs. This was due to two reasons: First, the 700nm wavelength emission is in a spectral region where the sensitivity level of the human eye is very low (Figure 2) and therefore, it does not appear to be very bright even though the efficiency is high (the human eye is most responsive to yellow-green light). Second, this high efficiency is only achieved at low currents. As the current increases, the efficiency decreases. This pr oves to be a disadvantage to users such as outdoor message sign manufacturers who typically multiplex their LEDs at high currents to achieve brightness levels similar to that of DC continuous operation. As a result, GaP red LEDs are currently used in only a limited number of applications. As LED technology progressed through the 1970s, additional colors and wavelengths became available. The most common materials were GaP green and red, GaAsP orange or high efficiency red and GaAsP yellow, all of which are still used today (Table3). The trend towards more practical applications was also beginning to develop. LEDs were found in such products as calculators, digital watches and test equipment. Although the reliability of LEDs has always been superior to that of incandescent, neon etc., the failure rate of early devices was much higher than current technology now achieves. This was due in part to the actual component assembly that was primarily manual in nature. Individual operators performed such tasks as dispensing epoxy, placing the die into position, and mixing epoxy all by hand. This resulted in defects such as epoxy slop which caused VF (forward voltage) and VR (reverse voltage) leakage or even shorting of the PN junction. In addition, the growth methods and materia ls used were not as refined as they are today. High numbers of defects in the crystal, substrate and epitaxial layers resulted in reduced efficiency and shorter device lifetimes. Gallium Aluminum Arsenide It wasnt until the 1980s when a new material, GaAlAs (gallium aluminum arsenide) was developed, that a rapid growth in the use ofLEDsbegan to occur. GaAlAs technology provided superior performance over previously availableLEDs. The brightness was over 10 times greater than standardLEDsdue to increased efficiency and multi-layer, heterojunction type structures. The voltage required for operation was lower resulting in a total power savings. TheLEDscould also be easily pulsed or multiplexed. This allowed their use in variable message and outdoor signs.LEDswere also designed into such applications as bar code scanners, fiber optic data transmission systems, and medical equipment. Although this was a major breakthrough inLEDtechnology, there were still significant drawbacks to GaAlAs material. First, it was only available in a red 660nm wavelength. Second, the light output degradation of GaAlAs is greater than that of standard technology. It has long been a misconception withLEDsthat lig ht output will decrease by 50% after 100,000 hours of operation. In fact, some GaAlAsLEDsmay decrease by 50% after only 50,000 -70,000 hours of operation. This is especially true in high temperature and/or high humidity environments. Also during this time, yellow, green and orange saw only a minor improvement in brightness and efficiency which was primarily due to improvements in crystal growth and optics design. The basic structure of the material remained relatively unchanged. To overcome these difficult issues new technology was needed.LEDdesigners turned to laser diode technology for solutions. In parallel with the rapid developments inLEDtechnology, laser diode technology had also been making progress. In the late 1980s laser diodes with output in the visible spectrum began to be commercially produced for applications such as bar code readers, measurement and alignment systems and next generation storage systems.LEDdesigners looked to using similar techniques to produce high brightness and high reliabilityLEDs. This led to the development of InGaAlP (Indium Gallium Aluminum Phosphide) visibleLEDs. The use of InGaAlP as the luminescent material allowed flexibility in the design ofLEDoutput color simply by adjusting the size of the energy band gap. Thus, green, yellow, orange and redLEDsall could be produced using the same basic technology. Additionally, light output degradation of InGaAlP material is significantly improved even at elevated temperature an d humidity. Current Developments of LED Technology InGaAlPLEDstook a further leap in brightness with a new development by Toshiba, a leading manufacturer ofLEDs. Toshiba, using the MOCVD (Metal Oxide Chemical Vapor Deposition) growth process, was able to produce a device structure that reflected 90% or more of the generated light traveling from the active layer to the substrate back as useful light output (Figure 4). This allowed for an almost two-fold increase in theLEDluminance over conventional devices.LEDperformance was further improved by introducing a current blocking layer into theLEDstructure (Figure 5). This blocking layer essentially channels the current through the device to achieve better device efficiency. As a result of these developments, much of the growth forLEDsin the 1990s will be concentrated in three main areas: The first is in traffic control devices such as stop lights, pedestrian signals, barricade lights and road hazard signs. The second is in variable message signs such as the one located in Times Square New York which displays commodities, news and other information. The third concentration would be in automotive applications. The visibleLEDhas come a long way since its introduction almost 30 years ago and has yet to show any signs of slowing down. A BlueLED, which has only recently become available in production quantities, will result in an entire generation of new applications. BlueLEDsbecause of their high photon energies (>2.5eV) and relatively low eye sensitivity have always been difficult to manufacture. In addition the technology necessary to fabricate theseLEDsis very different and far less advanced than standardLEDmaterials. The blueLEDsavailable today consist of GaN (gallium nitride) and SiC (silicon carbide) construction with brightness levels in excess of 1000mcd @ 20mA for GaN devices. Since blue is one of the primary colors, (the other two being red and green), full color solid stateLEDsigns, TVs etc. will soon become commercially available. Full colorLEDsigns have already been manufactured on a small prototype basis, however, due to the high price of blueLEDs, it is still not practical on a large scale. Other applications for blueLEDsinclude medical diagnostic equipment and photolithography. LED Colors It is also possible to produce other colors using the same basic GaN technology and growth processes. For example, a high brightness green (approximately 500nm)LEDhas been developed that is currently being evaluated for use as a replacement to the green bulb in traffic lights. Other colors including purple and white are also possible. With the recent introduction of blueLEDs, it is now possible to produce white by selectively combining the proper combination of red, green and blue light. This process however, requires sophisticated software and hardware design to implement. In addition, the brightness level is low and the overall light output of each RGB die being used degrades at a different rate resulting in an eventual color unbalance. Another approach being taken to achieve white light output, is to use a phosphor layer (Yttrium Aluminum Garnet) on the surface of a blueLED. In summary,LEDshave gone from infancy to adolescence and are experiencing some of the most rapid market growth of their lifetime. By using InGaAlP material with MOCVD as the growth process, combined with efficient delivery of generated light and efficient use of injected current, some of the brightest, most efficient and most reliableLEDsare now available. This technology together with other novelLEDstructures will ensure wide application ofLEDs. New developments in the blue spectrum and on white light output will also guarantee the continued increase in applications of these economical light sources. Practical use The first commercial LEDs were commonly used as replacements forincandescentandneonindicator lamps, and inseven-segment displays,first in expensive equipment such as laboratory and electronics test equipment, then later in such appliances as TVs, radios, telephones, calculators, and even watches (see list ofsignal uses). These red LEDs were bright enough only for use as indicators, as the light output was not enough to illuminate an area. Readouts in calculators were so small that plastic lenses were built over each digit to make them legible. Later, other colors grew widely available and also appeared in appliances and equipment. As LED materials technology grew more advanced, light output rose, while maintaining efficiency and reliability at acceptable levels. The invention and development of the high power white light LED led to use for illumination, which is fast replacing incandescent and fluorescent lighting. (see list ofillumination applications). Most LEDs were made in the ve ry common 5mm T1 ¾ and 3mm T1 packages, but with rising power output, it has grown increasingly necessary to shed excess heat to maintain reliability,so more complex packages have been adapted for efficient heat dissipation. Packages for state-of-the-arthigh power LEDsbear little resemblance to early LEDs. Continuing development The first high-brightness blue LED was demonstrated byShuji NakamuraofNichia Corporationand was based onInGaNborrowing on critical developments inGaNnucleation on sapphire substrates and the demonstration of p-type doping of GaN which were developed byIsamu Akasakiand H. Amano inNagoya. In 1995,Alberto Barbieriat theCardiff UniversityLaboratory (GB) investigated the efficiency and reliability of high-brightness LEDs and demonstrated a very impressive result by using a transparent contact made ofindium tin oxide(ITO) on (AlGaInP/GaAs) LED. The existence of blue LEDs and high efficiency LEDs quickly led to the development of the firstwhite LED, which employed aY3Al5O12:Ce, or YAG, phosphor coating to mix yellow (down-converted) light with blue to produce light that appears white. Nakamura was awarded the 2006Millennium Technology Prizefor his invention. The development of LED technology has caused their efficiency and light output torise exponentially, with a doubling occurring about every 36 months since the 1960s, in a way similar toMoores law. The advances are generally attributed to the parallel development of other semiconductor technologies and advances in optics and material science. This trend is normally calledHaitzs Lawafter Dr. Roland Haitz. In February 2008, 300lumensof visible light per wattluminous efficacy(not per electrical watt) and warm-light emission was achieved by usingnanocrystals. In 2009, a process for growing gallium nitride (GaN) LEDs on silicon has been reported.Epitaxycosts could be reduced by up to 90% using six-inch silicon wafers instead of two-inch sapphire wafers. Illustration of Haitzs Law. Light output per LED as a function of production year, note the logarithmic scale on the vertical axis Technology Physics The LED consists of a chip of semiconducting materialdopedwith impurities to create ap-n junction. As in other diodes, current flows easily from the p-side, oranode, to the n-side, orcathode, but not in the reverse direction. Charge-carriers—electronsandholes—flow into the junction fromelectrodeswith different voltages. When an electron meets a hole, it falls into a lowerenergy level, and releasesenergyin the form of a photon. Thewavelengthof the light emitted, and thus its color depends on theband gapenergy of the materials forming thep-n junction. Insiliconor germaniumdiodes, the electrons and holes recombine by anon-radiative transitionwhich produces no optical emission, because these are indirect band gapmaterials. The materials used for the LED have adirect band gapwith energies corresponding to near-infrared, visible or near-ultraviolet light. LED development began with infrared and red devices made withgallium arsenide. Advances inmaterials sciencehave enabled making devices with ever-shorter wavelengths, emitting light in a variety of colors. LEDs are usually built on an n-type substrate, with an electrode attached to the p-type layer deposited on its surface. P-type substrates, while less common, occur as well. Many commercial LEDs, especially GaN/InGaN, also usesapphiresubstrate. Most materials used for LED production have very highrefractive indices. This means that much light will be reflected back into the material at the material/air surface interface. Thus,light extraction in LEDsis an important aspect of LED production, subject to much research and development. The inner workings of an LED I-V diagram for adiode. An LED will begin to emit light when the on-voltageis exceeded. Typical on voltages are 2-3volts. Refractive Index Idealized example of light emission cones in a semiconductor, for a single point-source emission zone. The left illustration is for a fully translucent wafer, while the right illustration shows the half-cones formed when the bottom layer is fully opaque. The light is actually emitted equally in all directions from the point-source, so the areas between the cones shows the large amount of trapped light energy that is wasted as heat. The light emission cones of a real LED wafer are far more complex than a single point-source light emission. Typically the light emission zone is a 2D plane between the wafers. Across this 2D plane, there is effectively a separate set of emission cones for every atom. Drawing the billions of overlapping cones is impossible, so this is a simplified diagram showing the extents of all the emission cones combined. The larger side cones are clipped to show the interior features and reduce image complexity; they would extend to the opposite edges of the 2D emission plane. Bare uncoated semiconductors such assiliconexhibit a very highrefractive indexrelative to open air, which prevents passage of photons at sharp angles relative to the air-contacting surface of the semiconductor. This property affects both the light-emission efficiency of LEDs as well as the light-absorption efficiency ofphotovoltaic cells. The refractive index of silicon is 4.24, while air is 1.00002926. Generally a flat-surfaced uncoated LED semiconductor chip will only emit light perpendicular to the semiconductors surface, and a few degrees to the side, in a cone shape referred to as thelight cone,cone of light,or theescape cone.The maximumangle of incidenceis referred to as thecritical angle. When this angle is exceeded photons no longer penetrate the semiconductor, but are instead reflected both internally inside the semiconductor crystal, and externally off the surface of the crystal as if it were amirror. Internal reflectionscan escape through other crystalline faces, if the incidence angle is low enough and the crystal is sufficiently transparent to not re-absorb the photon emission. But for a simple square LED with 90-degree angled surfaces on all sides, the faces all act as equal angle mirrors. In this case the light cannot escape and is lost as waste heat in the crystal. A convoluted chip surface with angledfacetssimilar to a jewel orfresnel lenscan increase light output by allowing light to be emitted perpendicular to the chip surface while far to the sides of the photon emission point. The ideal shape of a semiconductor with maximum light output would be amicrospherewith the photon emission occurring at the exact center, with electrodes penetrating to the center to contact at the emission point. All light rays emanating from the center would be perpendicular to the entire surface of the sphere, resulting in no internal reflections. A hemispherical semiconductor would also work, with the flat back-surface serving as a mirror to back-scattered photons. Transition coatings Many LED semiconductor chips arepottedin clear or colored molded plastic shells. The plastic shell has three purposes: 1. Mounting the semiconductor chip in devices is easier to accomplish. 2. The tiny fragile electrical wiring is physically supported and protected from damage 3. The plastic acts as a refractive intermediary between the relatively high-index semiconductor and low-index open air. The third feature helps to boost the light emission from the semiconductor by acting as a diffusing lens, allowing light to be emitted at a much higher angle of incidence from the light cone, than the bare chip is able to emit alone. Efficiency and operational parameters Typical indicator LEDs are designed to operate with no more than 30-60mWof electrical power. Around 1999,Philips Lumiledsintroduced power LEDs capable of continuous use at oneW. These LEDs used much larger semiconductor die sizes to handle the large power inputs. Also, the semiconductor dies were mounted onto metal slugs to allow for heat removal from the LED die. One of the key advantages of LED-based lighting is its high efficacy,[dubious-discuss]as measured by its light output per unit power input. White LEDs quickly matched and overtook the efficacy of standard incandescent lighting systems. In 2002, Lumileds made five-watt LEDs available with aluminous efficacyof 18-22 lumens per watt (lm/W). For comparison, a conventional 60-100 Wincandescent light bulbemits around 15 lm/W, and standardfluorescent lightsemit up to 100 lm/W. A recurring problem is that efficacy falls sharply with rising current. This effect is known asdroopand effectively limits the light output of a given LED, raising heating more than light output for higher current. In September 2003, a new type of blue LED was demonstrated by the companyCree Inc.to provide 24mW at 20milliamperes(mA). This produced a commercially packaged white light giving 65 lm/W at 20 mA, becoming the brightest white LED commercially available at the time, and more than four times as efficient as standard incandescents. In 2006, they demonstrated a prototype with a record white LED luminous efficacy of 131 lm/W at 20 mA. Also,Seoul Semiconductorplans for 135 lm/W by 2007 and 145 lm/W by 2008,which would be nearing an order of magnitude improvement over standard incandescents and better than even standard fluorescents.Nichia Corporationhas developed a white LED with luminous efficacy of 150 lm/W at a forward current of 20 mA. Practical general lighting needs high-power LEDs, of one watt or more. Typical operating currents for such devices begin at 350 mA. Note that these efficiencies are for the LED chip only, held at low temperature in a lab. Lighting works at higher temperature and with drive circuit losses, so efficiencies are much lower.United States Department of Energy(DOE) testing of commercial LED lamps designed to replace incandescent lamps orCFLsshowed that average efficacy was still about 46 lm/W in 2009 (tested performance ranged from 17lm/W to 79lm/W). Cree issued a press release on February 3, 2010 about a laboratory prototype LED achieving 208 lumens per watt at room temperature. The correlatedcolor temperaturewas reported to be 4579K. Lifetime and failure Main article:List of LED failure modes Solid state devices such as LEDs are subject to very limitedwear and tearif operated at low currents and at low temperatures. Many of the LEDs made in the 1970s and 1980s are still in service today. Typical lifetimes quoted are 25,000 to 100,000 hours but heat and current settings can extend or shorten this time significantly. The most common symptom of LED (anddiode laser) failure is the gradual lowering of light output and loss of efficiency. Sudden failures, although rare, can occur as well. Early red LEDs were notable for their short lifetime. With the development of high-power LEDs the devices are subjected to higherjunction temperaturesand higher current densities than traditional devices. This causes stress on the material and may cause early light-output degradation. To quantitatively classify lifetime in a standardized manner it has been suggested to use the terms L75 and L50 which is the time it will take a given LED to reach 75% and 50% light output respectively. Like other lighting devices, LED performance is temperature dependent. Most manufacturers published ratings of LEDs are for an operating temperature of 25 °C. LEDs used outdoors, such as traffic signals or in-pavement signal lights, and that are utilized in climates where the temperature within the luminaire gets very hot, could result in low signal intensities or even failure. LED light output actually rises at colder temperatures (leveling off depending on type at around −30C). Consequently, LED technology may be a good replacement in uses such as supermarket freezer lightingand will last longer than other technologies. Because LEDs emit less heat than incandescent bulbs, they are an energy-efficient technology for uses such as freezers. However, because they emit little heat, ice and snow may build up on the LED luminaire in colder climates.This lack of waste heat generation has been observed to cause sometimes significant problems with street traffic signals and airport runway lighting in snow-prone areas, although some research has been done to try to develop heat sink technologies to transfer heat to other areas of the luminaire. Ultraviolet and blue LEDs BlueLEDs. Blue LEDs are based on the wideband gapsemiconductors GaN (gallium nitride) andInGaN(indium gallium nitride). They can be added to existing red and green LEDs to produce the impression of white light, though white LEDs today rarely use this principle. The first blue LEDs were made in 1971 by Jacques Pankove (inventor of the gallium nitride LED) atRCA Laboratories.These devices had too little light output to be of much practical use. In August of 1989, Cree Inc. introduced the first commercially available blue LED.In the late 1980s, key breakthroughs in GaNepitaxialgrowth andp-typedoping ushered in the modern era of GaN-based optoelectronic devices. Building upon this foundation, in 1993 high brightness blue LEDs were demonstrated. By the late 1990s, blue LEDs had become widely available. They have an active region consisting of one or more InGaNquantum wellssandwiched between thicker layers of GaN, called cladding layers. By varying the relative InN-GaN fraction in the InGaN quantum wells, the light emission can be varied from violet to amber. AlGaNaluminium gallium nitrideof varying AlN fraction can be used to manufacture the cladding and quantum well layers for ultraviolet LEDs, but these devices have not yet reached the level of efficiency and technological maturity of the InGaN-GaN blue/green devices. If the active quantum well layers are GaN, instead of alloyed InGaN or AlGaN, the device will emit near-ultraviolet light with wavelengths around 350-370nm. Green LEDs manufactured from the InGaN-GaN system are far more efficient and brighter than green LEDs produced with non-nitride material systems. With nitrides containing aluminium, most oftenAlGaNandAlGaInN, even shorter wavelengths are achievable. Ultraviolet LEDs in a range of wavelengths are becoming available on the market. Near-UV emitters at wavelengths around 375-395nm are already cheap and often encountered, for example, asblack lightlamp replacements for inspection of anti-counterfeitingUV watermarks in some documents and paper currencies. Shorter wavelength diodes, while substantially more expensive, are commercially available for wavelengths down to 247nm.As the photosensitivity of microorganisms approximately matches the absorption spectrum ofDNA, with a peak at about 260nm, UV LED emitting at 250-270nm are to be expected in prospective disinfection and sterilization devices. Recent research has shown that commercially available UVA LEDs (365nm) are already effective disinfection and sterilization devices. Deep-UV wavelengths were obtained in laboratories usingaluminium nitride(210nm),boron nitride(215nm)anddiamond(235nm). White light There are two primary ways of producing high intensity white-light using LEDs. One is to use individual LEDs that emit threeprimary colors—red, green, and blue—and then mix all the colors to form white light. The other is to use a phosphor material to convert monochromatic light from a blue or UV LED to broad-spectrum white light, much in the same way a fluorescent light bulb works. Due tometamerism, it is possible to have quite different spectra that appear white. RGB systems Combined spectral curves for blue, yellow-green, and high brightness red solid-state semiconductor LEDs.FWHMspectral bandwidth is approximately 24-27 nm for all three colors. White lightcan be formed by mixing differently colored lights, the most common method is to usered, green and blue(RGB). Hence the Care Of Diabetic Foot: How To Prevent Amputation Care Of Diabetic Foot: How To Prevent Amputation Introduction Diabetes mellitus is defined as a metabolic disorder characterised by chronic hyperglycaemia with metabolism disturbances in carbohydrate, protein and fat because of defects in insulin secretion, insulin action, or both (SIGN 2010). Diabetes mellitus is one of the main causes of increasing morbidity and mortality in Scotland and worldwide every years (SIGN 2010). Diabetes leads to several problems that begins with many of symptoms and debility on the short term and ending with a wide complications such as blindness, renal failure and amputation. Furthermore, diabetes has a significant impact on increasing the mortality and premature death from cardiovascular disease such as stroke and myocardial infarction (Massi-Benedetti 2002). Globally, the international diabetes federation (IDF) estimated the number of adults (between 20 79 years) with diabetes mellitus disease in 2010 around 285 million in seven regions of the IDF, and estimated the percent of adults with diabetes in 2010 in Europe 8.6%, United Kingdom 4.9%, United States of America 12.3% and similarly at both Jordan and Libyan Arab Jamahiriya 7.5% (IDF Diabetes Atlas 2010). And to the same years, the IDF estimated that the number of deaths due to diabetes mellitus is approximately 3.9 million deaths annually which represents 6.8% of all total global mortality (IDF 2009) . Moreover the number of people who have diabetes were approximately 39 million in 2007 and the expected gradual increase 439 million in 2030 (IDF 2009).Furthermore, in another study the IDF estimated that 23 million years of life are lost due to disability, decrease quality of life and reduce lifespan of person as a result of complications related to diabetes (Egede and Ellis, 2010). T he cost of treating and preventing diabetes globally in 2007 was approximately $ 232 billion, this number is expected to increase to over $300 billion in 2025 (Egede and Ellis, 2010). The United State of America spent in 2002 around $132 billion on diabetes (Egede 2006), and spent around $10.9 billion in 2001 on treating diabetic foot ulceration and amputations (Gordois et al. 2003). Also, The United Kingdom spent in 2001 approximately 5% of the total National Health Service (NHS) expenditure ( £3 billion) on diabetes mellitus (Wild et al. 2004). The Diabetic foot complications cost the United Kingdom approximately  £252 million each year (Adam et al. 2003). Every 30 seconds a lower extremity is lost in patients with diabetes due to amputation in the world (IDF 2009). Additionally, around 5% of European population suffer from Type 2 diabetes mellitus (IDF Diabetes Atlas 2007). India was the country with the highest numbers of patients with diabetes mellitus in Asia (Wild et al. 2004). The complications of diabetes remain very common in the developing countries such as diabetic foot and amputations (IDF 2005) the same as other developing countries in the world. Boulton et al (2005) identified that there are several factors that contribute to the increase complications and incidence of diabetic foot; these include late discovery of the disease and diabetic foot complications; the presence of catalysts such as neuropathy and high infected complications helps, moreover, deficiencies in podiatry service in most countries, barefoot gait which is common in some cultures and some of social beliefs and cultural traditions which are still in control of some communities and drives patients with diabetes to use and to depended on traditional healers, village elders and alternative medicine for treating themselves . In Sub-Saharan Africa, which contains 33 countries from the list of 50 poorest countries in the world; these countries are facing a significant increase in the rate of diabetes during the next twenty years (Wild et al. 2004). Diabetic foot complications are a major cause of increasing public health problem, leading cause of admissions to hospitals, amputation and increased mortality rate in diabetic patients (Zulfiqarali and Lennox, 2005). The main reasons leading to increase rate of diabetic foot in Africa were the frequency of neuropathy and peripheral vascular disease, unhygienic conditions, poverty, barefoot gait and inappropriate foot wear, low income, urbanisation, frequent co-existing HIV infection, and cultural beliefs and incorrect practices (Boulton et al. 2005). Risk of developing foot ulcers during lifetime of diabetes patient is approximately as high as 25 % (Singh et al. 2005). The International Diabetes Foundation confirmed that awareness regarding foot complications must be increased between diabetic patients because of its positive impact on personal, social, medical, and economic costs (Boulton 2004). Implementing screening, educational, and treatment programs globally in every area of the world was the biggest challenge facing the Global Diabetes Community (Boulton et al. 2005). A diabetic patient faces many problems caused by diabetic foot such as pain, morbidity and substantial economic consequences. The infection rate by diabetic foot differs between developing and developed countries and between European countries. Globally 25%-90% of all amputations were caused by diabetes (Boulton et al. 2005). The cost of treating diabetic foot ulcers was affected by the implementations of some interventions to prevent the development of foot ulcers, care strategies to heal ulcers or wound to prevent inflammation and amputation, shorten period of wound healing, and by frequent care necessary for disability after amputation (Tennvall and Apelqvist, 2004). In Europe and North America 7-20% from of the total expenditure is spent on diabetes and more precisely on the diabetic foot care (Boulton et al. 2005). In a Swedish prospective study it was estimated that diabetic patient with foot ulcers cost around 37% of the total costs on foot ulcers care until healed without amputation but if the patient needs amputation the inpatient care will cost up to 65% of the total costs, and also costs around 45% of the total costs using topical treatment of wounds but this percentage changes to 13% in patients with amputation (Boulton et al. 2005). The economic costs of minor lower limb amputation (foot level) such as toes around $43,800 and for main lower limb amputation (above ankle) such as all foot around $66,215, of which 77% of the costs comes post-amputation (Boulton et al. 2005). Applying foot-care services such as screening, education, treatment can effectively the rate of amputation among diabetes patients (Boulton et al. 2005). Furthermore, treatment of diabetic patients with or without diabetic foot according to the present management guidelines would result in enhanced survival and significantly reduced number of diabetic foot complications. Furthermore, it leads to significant reduction of up to 25-40% from the total economic costs of treating ulceration and amputation (Ortegon et al. 2004). Also, the adherence of diabetes patient to education and treatment is very important, effective and playing important role to prevent diabetes complication and improvement of patient health (Boulton et al. 2005). Aims and objectives Aims: To create more awareness of diabetic foot complication and foot care. To promote foot health in individual with diabetes and minimise the risk of foot complication. To identify major causes that lead to foot ulcers and how to prevent them. To inform people with diabetes about the actions and measures they can take to prevent occurrence of foot complications, provide diabetes self care education and encourage patients to change their behaviours to enhance foot hygiene and appropriate foot wear. To inform patients how to look after their wounds or ulcers. To reduce risk of lower extremity complication and amputation between diabetic patients. To try and improve the flow of information and intervention between patients and health care specialists. To enhance communication between diabetic patients and multidisciplinary care team. Objectives: Educate diabetic patient about good foot hygiene, diabetes risk factors, wound care, and about appropriate foot wear. Provide education about foot care by regular monitoring identification and early detection of ulcers, determination of risk factors such as (Neuropathy, Ischemia, Deformity, Callus, Oedema). Educate patient about the risk factors that can are increase diabetic foot complications such as poor fittings shoes, smoking, obesity, blood pressure, high lipids, aging and positive history to ulcers or amputation. Educate patient about proper footwear, nails care and wound care. Outcomes: Patient will have good circulation to feet. Patient will identify and take action when injury occurs. Patient will know how to take care of his feet. Patient will be able to determine the risk factors to diabetes ulceration and lower limb amputation. Patient will identify and select appropriate foot wear. Patient will be able to identify the importance of wound care, early detection of ulcers, good diet and exercise, regular monitoring and assessment of foot, adjust the level of sugar in the blood and stop smoking. Interventions Worldwide, 3.2 million deaths reported in relation to diabetes complications every year, also one in twenty deaths in the world due to diabetes resulting in 8700 deaths daily, this is equivalent to 6 deaths every minute (Unwin and Marlin, 2004). Study was estimated incidence of foot ulcers each year to diabetes patient around 2-6%, a prevalence of 3-8%, also estimated recurrence rates of ulcers within 5 years approximately 50-70%, the average of healing ulcers of 11-14weeks and the rates of incident of amputation after a one year estimated by 15%. However, the cost of diabetic foot include direct costs related to foot complications and also indirect costs related to loss of productivity, patient and family economic costs and loss of quality of life (Boulton et al. 2005). In a prospective study following up patients after foot ulcer healing, explained the return ulceration rates to patient after 1 years was 34%, at 3 years was 61% and at 5 years 70%. The diabetic patients with recurre nt ulcers, the highest costs were for hospitalise care, social services, and self care in home (Boulton et al. 2005). Diabetic foot complications are very common worldwide; it leads to social, political and economic impacts on society, patients and their families (Boulton et al. 2005). When Paul Brand was asked to suggest a recommendation to reduce amputations and foot complications in diabetes patient to the US Department of Health conference, most of the attendees were probably expecting an answer of both either promoting vascular surgery or modern medications, but they were surprised to hear that his answer was the recommendation to encourage health care professionals and caregivers to remove patients shoes, socks and after that examine and assess feet, many countries in the world ignored these recommendations. Although, the assessment of foot does not require expensive equipment for example a tuning fork, pin, tendon hammer and 10g monofilament these are cheap and suffice(Boulton 2004; Singh et al. 2005). The education should be focused on the diabetic patients with high risk feet. Furthermore, when planning an educational programme the caregivers should not forget that many patients donated are unable to understand what neuropathy, nephropathy, ischemia or risks of foot ulcers means (Vileikyte et al. 2004). Because of that the education should be simple, easy to understand by patients and suitable for the culture and social background of the patient (Boulton et al. 2005). First: Risk Factors One amputation occurs every 30 seconds worldwide between diabetic patients (Bakker et al. 2005). Approximately 15% of diabetic patients develop foot ulcers (Edmonds 2008). Amputation occurs more with diabetes patient than patient without diabetes (SIGN 2010). Three main pathologies factors must be met for the beginning and stimulation development of diabetic foot complications: neuropath, ischemia and infection. Furthermore, People with diabetes mellitus are higher to develop lower limb amputation between 15-46 times more than people without diabetes mellitus (Wilson 2005). Neuropathy is the most frequent and common complications in diabetic patients. It affects around 50% from all diabetic patients (Wilson 2005). The danger lies in the loss of protective sensation to pain, thus patient feel or recognise the pain or any discomfort in the lower extremity (Urbancic-Rovan, 2005). Ischaemia is four times more common in people with diabetes than in people without diabetes. Some of the factors that lead to increased occurrence of ischaemia were smoking, hypertension and hyperlipidaemia. Usually it develops gradually and slowly in diabetic patients, but in the end leads to a severe decrease in arterial perfusion and results in compromising vascular supply of the skin, and most often leads to a minor or major trauma in the lower extremity (Wilson 2005). Ischaemia and neuropathy are mostly associated together in diabetic patient (Edmonds and Foster, 2005) Infection of wound or ulcers in diabetes patient is the main reason for admission to hospital, and also increasing the incidence of amputation, when the infection is associated with neuropathy and ischaemia it leads to higher incidence of infection without pain, furthermore, leads to the loss of some of the inflammatory response such as increased temperature and white blood cell count (Wilson 2005). Additionally risk factors identified by (Urbancic-Rovan, 2005) that can effect diabetes patient and lead to ulceration and lower extremity amputation includes: Foot deformity because of motor neuropathy and muscle atrophy. Callus growth and formation. Disability in joint mobility. Reduced metabolic control leading to impaired wound or ulcer healing. Positive history to foot ulcer or lower limb amputation. Autonomic neuropathy that leads to gradually decreased sweating and dry fissured skin in foot. Obesity. Retinopathy. Inappropriate footwear. Smoking. Older people. Socioeconomic status. Interventions: Early detection and screening in addition to appropriate management of these ulcers can lead to preventing up to 85% of amputation (Edmonds and Foster, 2005). To provide effective treatment and management the patient should know and understand the major causes and risk factors for ulceration and amputation, meticulous treatment plan and should have frequent routine screening (Wilson 2005). Moreover, regular screening and assessment for feet of diabetes patient give the patient the opportunity of up to 99.6% to keep his feet free from ulcerations (follow up at 1.7 years) and were 83 times less probable to incident ulcers than the high- risk group (SIGN 2010). Teaching patients about the metabolic management, such as the control of blood glucose by regular diet, exercise, insulin and medication to protect neurological function. Patient should be educated on how to treat blood pressure, high lipids and should be encouraged to stop smoking to preserve cardiovascular function, prevent the occurrences of ischemia and enhance blood supply to lower extremity (Edmonds 2008). Encourage diabetic patient to daily foot examination and inspection, full monitoring of his feet by specialist diabetes doctor or nurse every 4 months and full screening and examination test every 6 month (Michael et al. 2005). All diabetes patients when diagnosed with diabetes mellitus should be educated and encouraged to be screen and examine his foot regularly or at least annually to detect any risk factors for foot ulcers as early as possible (Edmonds 2008). And to assess their risk of beginning a foot ulcer complication (SIGN 2010). patients should be screened for the main risk factors which include: Neuropathy, which is the most common complication of diabetes mellitus and begins to produce primitive signs that emerge within 5 years of the onset of the disease (Hampton 2006). The neuropathy can be assessed by the use simple techniques such as 10g monofilament to assess pressure sensation in patient. On the other hand, the use of vibration perception threshold by using a neurothesiometer to assess patients (Edmonds 2008). Because the vibration perception threshold is more sensitive than the 10g monofilament especially in persons at risk for foot ulcers (Miranda-Palma et al. 2005). Ischaemia assessed by palpation of the dorsalis pedis or posterior tibial pulse, if it cannot be felt it is unlikely that there is significant ischaemia. So the significant factor indicating ischaemia is the reduced Doppler arterial waveform. But the American Diabetes Association (ADA) recommended that the ankle-brachial pressure index (ABPI) should be measured for all diabetic patient especially patients above 50 years of age (Edmonds 2008). Faglia et al (2005) showed in his study that 21% of the occurrence of peripheral arterial disease was indicated by a low ABPI in recently diagnosed diabetic patients. Deformity such as claw toes, pes cavus, hallux valgus, hallux rigidus, hammer toe, Charcot foot and nail deformities; these deformities lead to bony prominences and causes high mechanical pressures on the skin surface, thus leads to ulceration, especially in the absence of protective pain sensation and feeling, and when wearing inappropriate shoes. Thus any diabetes patient, who has any deformities, should be educated how to care for his feet (Edmonds 2008). Callus and Oedema: the presence of callus leads to ulceration because of the high pressure and friction on it. Also the oedema is the main factor causing ulceration, and often produced when patient is wearing inappropriate and poorly fitting shoes (Edmonds 2008). Diabetic patient should be educated about signs of infection. Swelling, redness and hotness, all of this are present with signs of systemic infections. Patient must visit a medical clinic immediately (Michael et al. 2005). Second: Foot care Diabetic foot complications are common complications between United Kingdome populations, according to statistics, 23-42% related to neuropathy, 9-23% vascular disease and 5-7% foot ulceration (SIGN 2010). Diabetic foot care guideline is very important and should be the main part of basic diabetic patient education programs and workshops (Michael et al. 2005). Interventions: Diabetes patient and caregivers nurses or physician should be taught the nail cutting techniques (Michael et al. 2005). Nails of diabetes patient should be cut when they are softer and flexible, therefore, the patient should cut his nails after a bath or shower; the patient should never try to cut the whole nail as one piece, cut out the corner of the nail or more down the sides of nail (Edmonds 2008). Patient should be educated to use the soft brush to clean about the nails and if the nails become thick, the nails care should be performed by a professional nurse or physician (Michael et al. 2005). Patient education regarding foot hygiene, nail care, general assessment of foot care and patient should know when and how to ask for help when having any symptoms, problems or any suspicions around his foot (Wilson 2005). Encourage patient to wear natural fibre socks, it is better to be white to simply detect any derange or bleeding from foot (Michael et al. 2005). Footwear may reduce the rate of amputation by 50% when it is used perfectly (Bloomgarden 2008). Footwear (shoes) should be padded with soft leather from the inside and have a broad rounded toes, with an elevated toe box, the heels must be low to prevent excessive pressure on toes, and they must be the appropriate size to prevent movement and friction within the shoe (Edmonds 2008). If the diabetic patient has any deformity in his foot it should be detected early and appropriate shoes selected before any complication occurs. The diabetes foot wear included to three main types: Sensible shoes it is used to protect diabetic patient with partial loss of sensation (low risk to develop foot ulceration). Readymade stock shoes it is used to patient who has few deformities, neuroischaemic feet and that needs to be protected almost all the time (moderate risk to develop foot ulceration). Customized shoes it is made specifically for patients with deformities and contains appropriate insoles to relieve pressure on the foot (Edmonds 2008). The custom-built footwear should be used to decrease callus severity and reduce ulcer repetition (SIGN 2010). Diabetic patient who have lost protective sensation and cannot feel normally in lower extremity should be protecting their feet from any mechanical, thermal, chimerical injury because of that they should be encouraged to develop a habit of regularly examining and inspecting their feet to detect any problem or complication early. In addition should be educated about type 2 diabetes to protect themselves as far as possible to avoid the occurrence of any injury (Edmonds 2008). If patient have lost their sensation in the lower extremity, recurring trauma, limited joint mobility, poor healing and have ischaemia in lower limb, all of this lead to increased incidence of ulceration and in addition amputation (Bloomgarden 2008). Should educate diabetic patients how to prevent dry skin to prevent ulceration, by applying emollient or lotion such as E45 cream on a daily basis (Reckitt Benckiser, Slough) or Calmurid cream (Galderma, Watford) (Edmonds 2008). Patient should be encouraged to use daily oil, lotion and lanolin cream to prevent dryness of skin (Michael et al. 2005). If patients have callus they should be educated not to cut their callus or use any product to remove it. Also the callus should be removed gradually by podiatrist to prevent ulceration (Edmonds 2008). Patient should not use any removers to remove corns or callus (Michael et al. 2005). The podiatrist can reduce effectively the number and size of foot calluses and enhance self care (SIGN 2010). Should be encouraged to do path to his foot daily with mild soap to promote blood circulation. Furthermore, patient should dry the feet carefully and use lambs wool between the toes if the skin stays moist or become macerated (Michael et al. 2005). The occurrence of foot wounds is 2-7% per year among diabetes patient (Bloomgarden 2008). Also the patient and caregivers should be educated about sterile dressings technique, the dressing should be covering all wound or ulcers to prevent infection, protect patient foot from any trauma, and promote wound healing (Edmonds 2008). Patient with wound or ulcers should be frequently assessed and inspected specially if the patient has lost protective pain sensation to early detect any development of complications or problems, because of this the dressing should be characterized by: uncomplicated and speed lifting, The ability to walk by without any trouble or suffering disintegration, good ability to monitor and evaluate the secretions and abscess (Edmonds 2008). Action plan: Agreed strategy for foot care such as protocol or guideline driven care of the patient. Involvement of a multidisciplinary foot team to include: diabetic nurse specialist, podiatrist, vascular and orthopaedic surgeon, diabetes physician, orthotist and radiologist. Education for staff and all caregivers looking after the feet of diabetic patients. Establishment and enhancement of good communication between the diabetic patient and multidisciplinary foot team and the primary medical doctor. Reinforcement using appropriate foot wears. Encouragement of diabetic patients to effectively liaising with the podiatrist. Maintain wound care by using appropriate and sterile dressings. Encouragement of community nurses to educate people, especially about diabetes mellitus, diet, insulin, diabetes medication and the risk of complications. Activate discussion groups and workshops for patients with diabetes in primary medical centres. Facilitating the knowledge, skill and human resources for the promotion of diabetes self care. Conclusion and recommendations Diabetes mellitus is defined as a metabolic disorder characterised by chronic hyperglycaemia with metabolism disturbances in carbohydrate, protein and fat because of defects in insulin secretion, insulin action, or both (SIGN 2010). Approximately 39 million person in 2007 diagnosed with diabetes and an expected gradual increase to 439 million in 2030 (IDF 2009). The diabetes Cost in 2007 worldwide was approximately $ 232 billion and expected to increase to over $300 billion in 2025 (Egede and Ellis, 2010). Every 30 seconds, a lower extremity is lost to diabetes due to amputation in the world (IDF 2009). Diabetic foot complications very common worldwide, also leads to big social, political and economic impacts to both society and to the patient and their families. Paul Brand, suggest a real recommendation to reducing amputations and foot complications to the US Department of Health conference that is to encourage multidisciplinary foot team to remove patients shoes, socks and after that examine and assessment patient feet. The diabetic foot is a significant healthcare problem worldwide and inadequate appropriate therapy may lead to the spread of serious complications such as amputation, disability and increase morbidity and mortality rate each year globally. Therefore, careful monitoring, regular assessment, patient education and education for the specialist team caring for diabetic foot ulcers are very important and significant. Furthermore, early detection and specialized treatment of any risk factors plays significant part to prevent foot complications and reducing the amputation rate. Diabetes leads to dramatically increased risk of diabetic foot and amputation, but available evidence based guidelines or protocols that this risk may be significantly reduced by effective screening and intervention. The multidisciplinary foot team should screen all diabetic patients regularly to early detect those at risk for foot ulceration and this screening should include all risk factors and all assessment procedure. Educating patients and caregivers about foot care and risk factors, full examination every 6 month or at least annually, appropriate footwear, daily self foot examination, wound care, smoking cessation, control of blood glucose level, activation of community nurses, enhance communication between diabetic patient and multidisciplinary foot team. All of these measures should be applied and adhered by patient firstly, and by all caregivers secondly to reduce diabetic foot complication and prevent amputation.

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Rain forests all the way essays The discussions these days are why are the rain forests depleting? Well this research will help change the opinions of many people. Some facts about rain forests are, Tropical rain forests occupy about 7 percent of the earths surface but harbor as much as 50 percent of the worlds plant and animal species. Also about 57 percent of all rain forests remaining are in the tropics in the Western Hemisphere: 30 percent are in Brazil. At the current rate of deforestation, tropical rain forests could be wiped out in 177 years. Less than 5 percent of the worlds tropical rain forests are protected within national parks and reserves (Steve Grant, 2). Rain forests are becoming very scarce and should be taking into concern because depletion of rain forests is a problem. One method of cutting down rain forests is slash-and-burn agriculture. Grant defines slash-and-burn agriculture as Smallholders that are cutting down four or five acres of forest and set it on fire. The resulting ash fertilizes the soils, which are notoriously poor in the tropics (1). Grant explains that now that there is only charred stumps left, a lot of light reaches the ground and is oppressively hot (1). In the past, a logger might take only a few trees per acre. While that would allow more light into the forest floor and raise the risk of fire (Grant, 2). So when people decide to cut down forests they are increasing the risk of fire. Rain forests have been burning up lately. An analysis of satellite by the EDF indicates that burning of rainforest land in Amazon increased 28% from 1996 to 1997 (Amazon rainforest, 1). Research shows A total of 19,115 fires are reported from the NOAA-12 satellite images in the sample in 1996, while 24,549 fires appear in the 1997 data over the period (1). One reason for rampant burning is that Brazils environmental agency has had no l ...

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The basic assumption of offender profiling is that the offenders behaviour at the crime scene reflects something about them as a person. It leaves a psychological fingerprint, particularly where there is a pattern over a number of crimes. For example, tying up a victim suggests a need for control. The aim is to go beyond the facts and develop hypotheses about the offender. The information used includes the analysis of the crime scene, details of the victim and current knowledge about offenders from research. Holmes (1989) suggests that profiling is most useful when the crime reflects psychopathology, such as sadistic assaults. 90% of profiling is for murder or rape, but can be used for arson, burglary, and robbery. Homant and Kennedy (1998) see crime-scene profiling as including psychological profiling of offenders, geographical profiling (the area of the crime and where the offender may live) and, in the case of murder, equivocal death analysis (how the murder was committed, and a psychological autopsy of the victim). The overall aim is to look for patterns and to compare them to what is known about certain crimes and criminals. The British Approach was developed independently of the police authorities from the separate work of David Canter and Paul Britton. There is some debate about which case was the first in Britain to use profiling. Many see Paul Brittons help in the 1983 case of Paul Bostock as the first time a psychologist was used to profile the offender. This case involved two separate murders with black magic associations found near the victims. Britton gave a limited profile to the police of a young, isolated man, who had access to knives, with an obsession for black magic (what Britton called a belief dysfunction). The police eventually arrested Bostock, who was a nineteen-year-old loner, a meat factory worker, with a house full of black magic items. He did not confess to the murders, so Britton advised a line of questioning based on Bostocks fantasies, which proved fruitful. The first well-known case in Britain to involve direct help to the police in profiling came in 1986, when David Canter started to help in the case of the Railway Rapist. This case involved 24 sexual assaults near railways in North London, and three murders (between 1982 and 1986). All the crimes showed signs of having the same offender. The first attacks were rapes, which initially were thought to be the work of two offenders together. Then the pattern became clear, and with the later murders, it was definitely one man. Canter was able to analyse the details and drew up the profile. Main points of Canters profile; Lived in area near to area of first crimes. Probably lives with woman. Aged mid-to late-20s. Right-handed. Semi-skilled or skilled job with weekend work, but relatively isolated work. Knowledge of railways. Previous criminal record for violence (maybe arrested between October 1982 and January 1984). Characteristics of offender; Lived in area suggested. Recently separated from wife. Aged late 20s. Right-handed. Travelling carpenter. Worked for British Rail. Raped wife at knife point. David Canter (1994) believes that criminals, like most people behave consistently. An analysis of the pattern of behaviour observed over a number of crimes committed by a serial offender will give clues about the non-offending everyday behaviour of the criminal. We all operate within a social context and so Canter believes that offences are not separate behaviours from the rest of the offenders life but rather are directly linked to their everyday interactions. Interviews with victims about things that were said at the time of the crime could give an indication of how the criminal normally interacts with others. For example, a rapist who is hesitant and apologetic to his victim could well be committing the rape because he does not know how to go about forming a genuine close relationship with a woman in his everyday life. The British approach involves advising police officers about correlations between sets of data, such as time, place and choice of victim. Canter identified five characteristics which, they believe can aid investigations Residential Location Criminal Biography Domestic/Social Characteristics Personal Characteristics Occupational/Educational History Canter believes that during the crime vital clues are left behind and the distinctive personality of the offender shows through in some ways. Thus, it is thought that the way in which the crime is committed is in part a reflection of the everyday traits and behaviour of the individual. The interaction between the offender and the victim is thus studied closely and categorised. Canter believes that by this careful study of offence behaviour, patterns can be established and variations between offenders identified. However unlike the FBI approach, Canter does not attempt to place offenders into rigid typologies, but rather suggests that their behaviour will mirror other aspects of their day-to-day life. Canter (1994) describes his task as picking from the shadows left by the criminals, those consistent patterns in behaviour. What happens during the offence can give clues to the non-offending parts of their lives. There will also be evidence from the interaction between the victim and the offender because we are social beings even in such unusual situations. For example, murderers who kill a stranger without any interaction are likely to live a solitary life (Canter, 1989). Other important factors may be the choice of victim, location, nature of the crime and what is/isnt said, and forensic awareness of the offender, like rapists who force victims to bathe after the attack to remove any evidence of pubic hairs. One aspect of profiling that is often overlooked is the methodological collection of data and statistical analysis. Often the profiler is no more than a glorified statistician. Canter and Heritage (1990) combed through the victim statements of 66 UK sexual assaults and with sophisticated statistics were able to identify clear patterns in the form of the attack. It is possible to group how the victim is treated in three ways, each giving a clue to the offender. Victim as person involving conversation during the attack asking whether the woman has a boyfriend, or complimenting her on her appearance. This type of offender believes he is developing some type of relationship with the victim, and mistakenly believes, the sexual assault produces intimacy. Victim as object blindfolding and/or gagging the victim, while the offender tends to be disguised. The offender is concerned most with control in the interaction of the rape. The woman is seen as a dangerous object that must be trussed and coerced (Canter, 1994). Victim as vehicle violence (both physical and verbal), which demeans the victim. The actions here are a reflection of the offenders anger. This emphasis on statistical patterns has led to the creation of a database called CATCHEM (Central Analytical Team Collating Homicide Expertise and Management). The database contains details of over 4,000 child murders, which allows police officers to make statistical predictions about the killer. For example, 62% of killers of females under seventeen are single, but 83% if the victim is male and under sixteen. If the childs body is found without sexual interference, there is around a 70% likelihood that the killer is the guardian or parent, but when there is sexual interference, this figure drops to 1% -2 % (Murder in Mind, 1993). In the UK there seems to have been some resistance to profiling by the police because psychologists have been viewed as outsiders and not being able to offer anything more than what a could practitioner (eg, detective) could. Geberth (1983) feels that experts have very little to say compared with what experienced police officers are likely to work out for themselves. Holmes (1989) reports that out of 192 offender In the UK the ability of profiling to accurately identify a culprit is felt to be limited. Copson and Holloway (1997) in a survey found that detectives felt that profiling led to the identification of the offender in only 2.7% of cases and helped to solve 16% of cases. Pinizzotto and Finkel (1990) attempted to discover whether professional profilers would be more accurate than detectives, clinical psychologists and students. They asked the participants to examine two closed police cases (a sex offence and a murder) and to draw up profiles. What they found was that the profilers did indeed produce richer and more detailed profiles and in relation to the sex offence, they were more accurate than non-profilers, but the detectives were more accurate on the murder case. Pinizzotto and Finkel concluded that the success of the profilers was the result of both confidence and experience rather than the use of an exclusive technique. The implications would therefore be that both training and practical experience are vital in developing profiling expertise and that productive liaison between the police and psychologists is the way forward in order to achieve both investigative and clinical objectives. There are a number of misconceptions about profiling, usually based on its fictional use and psycho-dynamic portraits of politicians. Rarely does profiling provide the specific identity of the offender, and this is not its purpose. The aim is to narrow the field of the investigation and suggest the type of person who committed the crime (Douglas et al, 1986). The profile report will try to establish the gender, approximate age, marital status, educational level and details of possible occupation of the offender. There may be suggestions of whether this person has a previous police record and if another offence is likely. Whether profiling is effective or not is a key question, and historically there are famous successes and failures. One of the best-known failures in America was the case of Albert DeSalvo (known as the Boston Strangler). A profile suggested the offender was a male homosexual schoolteacher living alone. When arrested, DeSalvo was found to be a heterosexual construction worker living with his family. In the UK, the Rachel Nickell case is seen as a failure of offender profiling. Rachel Nickell was a young woman who was brutally murdered in mid-morning while walking on Wimbledon Common in south London. As part of the investigation into the killing, a profile was commissioned from a psychologist. A suspect was eventually identified and it was noted that he seemed to fit the profile well. An elaborate operation, drawing partly but not only on the profile, was put together in which a police woman befriended the socially isolated and inadequate suspect, offering the promise of an intimate re lationship in exchange for descriptions of his sexual fantasies and a confession that he murdered the woman on the Common. The confession was not forthcoming, but he was still arrested. The case fell apart. Pinizzotto and Finkel (1990) argue that profiling is most effective in serial sexual offences because of the extensive research base, and least effective for fraud, burglary, robbery, theft and drug-induced crimes. Holmes (1989) feels that it is most useful when there is a psychopathology involved, such as sadistic assault. Holmes (1989) cites FBI data, which reveal that in 192 cases of profile generation in 1981, arrests were made in 88, but in only 17% of these did the profile contribute to the arrest. Others ( Oleson, 1996) point out that the seminal work of the FBI in establishing offender profiling may be methodologically flawed since no control groups were used to compare the evidence obtained from interviews with offenders and there is no mention of the statistical techniques used to analyse their data. Moreover, much of the evidence used by the FBI was simply information obtained in interviews with offenders and was accepted at face value. More recent research has made greater claims for the usefulness of offender profiling (for example, approximately 80% of cases solved were helped by offender profiling according to Canter and Heritage, 1990). In the UK, a survey of detectives in 48 police forces, who had worked with offender profiling concluded that identification of the offender came in 2.7% of cases and general help in 16% (Copson, 1995). What the survey did find was variety in the individuals who did the profiling. Those involved included clinical psychologists, forensic psychiatrists, academic psychologists, clinical psychiatrists, forensic psychologists and consultant therapists. The skill of the individual profiler determined whether the police officers were satisfied with profiling generally. Indeed the research suggests that, at this stage of the development of profiling in Britain, approaches to profiling are idiosyncratic (Copson, 1995). Britton (1997) also admits that a large number of cases continue to be solved, not by profiling, but by routine police work, or the use of forensic evidence. However we should also be aware that police officers may be reluctant to admit that outsiders have helped to solve a crime. Profiling does at least allow the police to better focus their investigations. This can be important for as Canter (1994) has noted the alternative is that the police will simply throw more and more resources at a crime in the hope that something will turn up. Nevertheless Jackson et al (1997) conclude that when profiles are considered as a separate entity, they seldom, if ever, offer enough foundation to guide an investigation in a new direction. They conclude that any profile should be accompanied by practical advice on how best to proceed with a particular investigation. We should also be aware of the danger of the self-fulfilling prophecy with respect to profiling. Detectives should bear in mind that a profile may well fit a number of people and may not be totally accurate. The fact that a suspect happens to fit the profile does not prove that they committed the offence. There may be several people who share the suspects make-up and so the police should be cautious before making a presumption of guilt. This issue is most likely to be created because psychologists will tend to work on probabilities whereas police may be more likely to operate in absolute terms of guilt and innocence. The danger is that once a person has been labelled as a suspect and brought in for questioning, the police will make a presumption of guilt and see their role as merely to elicit a confession. There is little good scientific research to which one can turn in trying to answer the question of how useful profiling is. Success or failure are not so easily measured when one is dealing with the sort of material used in profiling. If a profilers information proves to be 50% accurate and 50% inaccurate should this be counted as a success or a failure? In addition if any information provided by a profiler is used that helps in catching a criminal is this success, even if the rest of the information provided was useless? A related issue to this is that profile details may only be considered as useful if it provides a type of detail, which the police could not have reasonably deduced, for themselves.

Week 3 Article Example | Topics and Well Written Essays - 250 words

Week 3 - Article Example Besides, the emergence of information communication technology and expansive public-private partnership exposes corporates to public scrutiny hence need for integrity. The cut-throat competition that characterize this era of globalization emphasizes the need for ethical business practices. This is a multi-dimensional approach that would benefit corporates through offering a competitive level ground. It takes virtue to achieve this noble course lest the corporate world collapse into an avalanche of mayhem. Recent cases of corporate fraud by some firms and irresponsible observations are blamed on managers (Havard, 2007). For instance, the unfair Walmart labor practices, BP oil spill in Gulf of Mexico have all served as the examples of the cost of non-virtuous corporate leaders. There is need to emphasize virtue during selection of corporate managers as it serves as a critical tool in the modern business world (Havard, 2007). Virtue has been a key tool of organization progress in the long run from the past and in this era of a complex socio-economic and political dynamism, it is even more important. It is therefore worth to assert the need to consider virtue as a central corporate leadership selection

From Typical Contracts to E-Contracts Assignment

From Typical Contracts to E-Contracts - Assignment Example Therefore it is advantageous as it saves both consumers the time they would have used to travel to the signing offices. Third, the technology has greatly improved efficiency in the real estate sector hence resulting to reduce â€Å"contract-to-closing times.† Also, the electronic contract system reduces deforestation. This is because it has eliminated the use of papers for documentation. Instead, it uses CD’s where the signed documents are stored and issued to the consumers. In addition, the new procedures favor consumers who do not like to reveal their identity. This is because there is no eye contact between the buyer and seller. The only person who gets to meet the consumers is the attorney thus providing privacy to those who value their personal privacy. From the 1st classmate, I would agree with him that it feels different while closing deals through electronic system compared with the traditional way. Despite the difference in two methods, both need much attention as a way of maintaining accuracy. By using this method, consumers risk losing nothing since they are guaranteed protection from the real estate companies. None of their protection will be jeopardized in electronic contracts since all procedures are done in private. To the 2nd classmate, I think you should end the doubts you have towards the e-contract system. It is true people rarely read the whole contract but with the use of e-contracts, one can read them faster than reading hard copies . The search and find tools make all the difference thereby making the transactions easy and transparent. In addition to this, conditions precedent adhere to thereby the whole procedure is done under the discharge performance rule. By this, it means that the completion of the consumers’ contract can only be done through following what was promised before the signing of that contract.

Discuss about the perils and promise of pluralism in America Essay

Discuss about the perils and promise of pluralism in America - Essay Example In such a plural state as America is, every individual have the right to choose â€Å"what part of the multiplicity he wants to have or to belong to† (Johansson and Lynoe, 2008, p.245). In such a circumstance the stability of society depends on a ‘power balance’ (Johansson and Lynoe, 2008, p.245). Although this pluralism tries to ensure the greatest good, it is not a totalitarian principle and it has certain negative effects for individual and for society at large. The first effect of pluralism is that it gives rise to deferent interest groups in the politics. As America is probably the largest democracy in the world, the pluralistic view poses the question of whether having various interest groups is good for creating a policy. One of the major challenges that have arisen in the wake of this century is ensuring the national security from terrorist attack. America’s democracy promotion policy in the Muslim countries has been resisted by the Muslim Americans. Even a lack of clear definition of democracy allowed the Muslim Americans to question the basic presumption of democracy. The Judeo Christian tradition of America made it possible to create a society based on the shared values of catholic, protestant and Jewish religion. It was possible because certain denominations of the values of these religions were supported by the American life style. The 1965 Immigration Act was pivotal in creating a congregating identity of Muslims, Hindus, Buddhists and Sikhs. With the widening of democracy, these culturally diverse groups have been able to lobby the administration and influence the social and cultural life of America. Within the diversity, there are cultural groups who feel marginalized and it is due to the tension between cultural groups who are struggling to monitor the values and institution for desired reformation (Machacek: 2003, p.1) Cultural pluralism in America tends to denigrate certain social groups in regards to language,

How does the University of Phoenix Work to Combat Plagiarism Essay

How does the University of Phoenix Work to Combat Plagiarism - Essay Example Through the policy expressed in the code, a student is held responsible for committing a plagiaristic violation if he or she is found copying exact information of another individual for personal use or rephrasing statements and other portions of the whole content without proper citation of the work or information source. Moreover, the University of Phoenix makes it a point that each school member adheres to the policy as it promotes being the Center for Writing Excellence (CWE) by which good writing skills in the absence of plagiarism are ensured for the sake both of successful academic and professional accomplishments. Thus, in the further endeavor of dealing with the issue of plagiarism, CWE provides utilities such as Plagiarism Checker, WriterPoint, and review via tutor to detect plagiarism, correct flawed grammatical structures, as well as deliver thorough evaluation of a written piece. With up-to-date technology-based Plagiarism Checker, CWE has been able to render efficient monitoring of student work. To see if there are any items unduly copied in exact content and organization whether, through a bulk of phrases or choice of few words, Plagiarism Checker works like a serious investigator. By scanning student compositions against a wide range of electronic resources retrieved over the web and ProQuest database, such system is highly capable of tracking all details that match between creations under intensive check. In addition, the Certificate of Originality attached to every product of labor sets each student on a challenge to test individual accountability and integrity on conveying a pledge that swears his or her work is an original, affirming that all necessary citations are properly carried out and that no one else shares the same text in full or in part. As a consequence, student professionalism is further enhanced on managing to guarantee that the well-accom plished academic paper in partial fulfillment of a course in the  University of Phoenix is 100% plagiarism-free as certified authentic by its laborer.        

Why people bet online or prefer betting in stores Research Proposal

Why people bet online or prefer betting in stores - Research Proposal Example This is according to Luntz (2006). For starters, an individual can gamble within several sites. It is imperative to note that those sites offer massive rewards and bonuses. The bonuses come when the betting sites agree to reward new customers who have just registered to their sites. At the same time, the betting sites may agree to reward their old and loyal customers (Luntz 2006, 467). By this, they will be making the customers committed to what they do. Betting rewards also come in the form of clients being allowed to offer free bets on some occasions. In addition, the customers may be offered general bonuses. According to Petry (2004), we should not ignore the fact that people practice online sports betting because they find it somewhat safe. This fact may be debatable especially because there are a number of sites that claim to provide opportunities for betting, while their main intention is to fraud the public at large. Nevertheless, most of the betting sites in the UK are under the management of well-known companies with an irrefutable reputation like William Hill, Gala Coral, Bet365, Sky Betting and Gaming and 32Red among others (Petry 2004, 661). This makes online sports betting to be safe. Another reason as to why people indulge in online sports betting is the fact that it is comfortable.This is according to Kelly (2011). The ease is because for one to participate in online sports betting, then they need to be computer literate and have data access. The two requirements will enable any interested party to register on any online sports’ betting site and take part in betting. The ease is also demonstrated by the fact that the customers can... Considering how rapidly the betting industry has been growing, then I may be forgiven if I said that betting might just be as old as the society. The UK opened its doors to betting back in 1961 and since then the industry has never looked back. The betting shops have been rising in the number and so does the number of those who practice betting. Originally, people used to bet by visiting the betting shops. Supplementary to that, some people employed the services of a telephone credit betting. Due to the advancement in technology, however, some people started opting for online betting. And indeed online betting has not disappointed. The organizztion of the literature review is such that it first deals with why people carry out online sports betting followed by the reasons why people bet in stores. It is beyond doubt that betting is slowly spreading its wings into our society. It does not consider age given that children as little as 12 years old have attested to be involved in betting at one point. Similarly, even the older population takes part in betting because statistics reveal that those aged above sixty also take part in betting. In like manner, betting knows no gender because both males and females take part in it (Abott 2009, 412). We may not be able to predict the rate at which betting is advancing in the society. One fact for sure is that, whichever form of betting one involves in, be it online sports betting or visiting the betting stores, betting is gaining ground. In addition, we ought to appreciate the findings and works of the various authours reviewed above. This is because they have managed to bring us upto speed with an area of our life we almost forgot.