Meteorological Hazards in Aviation

Introduction Throughout its history, the aviation industry has had a close but unpleasant relationship with the vagrancies of weather (Vickers et al., 2001). Indeed, it has been proved that weather is the single largest contributor to delays and a foremost factor in aircraft disasters and incidents, implying that real-time weather information is substantially critical for hazardous weather avoidance in aviation operations (Witiw, Lanier Crooks, 2003).Advertising We will write a custom essay sample on Meteorological Hazards in Aviation specifically for you for only $16.05 $11/page Learn More Weather continues to exact its toll on the aviation sector, particularly when this argument is viewed in the context of past accidents that have been reported in mainstream media as caused by either meteorological hazards or a combination of human factors and weather elements (Broc et al., 2005; World Meteorological Association, 2007). The present paper critically di scusses some of the well known meteorological hazards in the aviation industry. Concept Definition Meteorology has been described as â€Å"†¦the science of the atmosphere, a sea of air that is in a constant state of flux† (Vickers et al., 2001, p. ix). Within this science exists a wide allay of weather/climatic conditions arising from natural interactions with other factors, products and byproducts, but which triggers a set of hazards that may prove disastrous to the aviator who must operate within the precincts of the atmosphere (Simpson et al., 2002). It is reported in the literature that no one is immune to the everyday oscillations of these meteorological hazards as they sweep across huge sections of the globe before dissipating (Vickers et al., 2001). Meteorological Hazards in Aviation Available literature demonstrates that there exists a multiplicity of weather conditions that qualify as hazards in aviation due to the scope and context of the dangers they present t o the industry (Broc et al., 2005). Some of the most predominant ones include icing, volcanic ash, poor visibility, windshear, heavy rains, lee waves, fronts, thunderstorms, cold weather and deformation zone (World Meteorological Association, 2007). This section samples a few of these meteorological hazards in aviation. Windshear Witiw et al (2003) describe the windshear as â€Å"†¦a sudden shift in wind direction, velocity, or both† (p. 131). These authors also report that the most aggressive expression of the condition occurs in a microburst, which is an intense downburst of cool air generated by, or released from, a large convective cloud. The World Meteorological Organization (2007) defines windshear as â€Å"†¦layers or columns of air, flowing with different velocities (i.e. speed and/or direction) to adjacent layers or columns† (p. 1). Windshear is a foremost hazard for low, slow flying aircraft in either the approach or departure phases due to the comp licated wind patterns occasioned by the downdrafts. As the aircraft glides through the microburst it stumbles upon intense headwinds accompanied by a substantial increase in aerodynamic drift and successive severe downdrafts, ultimately causing it to experience a rapid loss of lift and crash into the ground (Witiw et al., 2003).Advertising Looking for essay on aviation? Let's see if we can help you! Get your first paper with 15% OFF Learn More Consequently, some of the detrimental hazards caused by windshear include: 1) loss of aerodynamic lift and airspeed, making the aircraft to plunge into the ground before corrective action is taken by the flight crew, 2) turbulence especially in light aircraft, and 3) structural damage to the aircraft (Witiw et al., 2003; World Meteorological Organization, 2007). In the United States, the National Transport Safety Board (NTSB) database reveals that nearly 250 accidents involving U.S. aircrafts have been attributed to windshear, wi th 30 of them reported as major (Witiw et al., 2003). Thunderstorms Although one of the most beautiful atmospheric phenomenon (Harding, 2011), extant literature demonstrates that â€Å"†¦no other weather encountered by a pilot can be as violent or threatening as a thunderstorm† (Vickers et al., 2001, p.34). Indeed, thunderstorms generate more threats to the aviation industry and it is always important for the flight crew, air transport safety agencies, meteorologists and other interested stakeholders to not only understand their scope and context, but also how to deal with them effectively. Thunderstorms are generated by the coming together of several ingredients, including: 1) unbalanced air mass, 2) atmospheric moisture in the low levels, 3) some triggering mechanism, e.g. daytime heating or upper level cooling, and 4) other related meteorological vagrancies such as windshear (Vickers et al., 2001). These ingredients interact through a process called convection (transp ort of heat energy) to produce thunderstorms that basically attempt to correct the imbalance generated when the atmosphere becomes heated unevenly (Harding, 2011). It is important to note that there exist different types of thunderstorms that affect the aviation industry. Some of the most common types of include: 1) air mass thunderstorms – form within a worm, moist air mass and are non-frontal in character, 2) frontal thunderstorms – form either as a result of a frontal surface lifting an unbalanced air mass or a stable air mass becoming unbalanced due to the lifting, 3) squall line thunderstorms – aggressive combinations of strong winds, hail, rain and lighting, 4) orographic thunderstorms – occur when moist, unbalanced air is forced up a mountain slope at high pressure, and 5) nocturnal thunderstorms – develop during or persist all night (Vickers et al., 2001). Thunderstorms have the capability to generate hazards that can cause untold suffering in the aviation industry. For instance, â€Å"†¦all thunderstorms can produce severe turbulence, low level windshear, low ceilings and visibilities, hail and lighting† (Harding, 2011, p. 1).Advertising We will write a custom essay sample on Meteorological Hazards in Aviation specifically for you for only $16.05 $11/page Learn More It is not uncommon to hear news of aircraft that get lost in severe thunderstorms or helicopters that get struck by lightning, implying that each of these conditions can be potentially catastrophic (Broc et al., 2005). Other hazards generated by thunderstorms include ruthless clear icing, extremely profound precipitation, and dangerous electrical releases within and near the thunderstorm cell (Vickers et al., 2001; World Meteorological Organization, 2007). Visibility It is reported in the literature that reduced visibility is the meteorological element which impacts aviation operations the most through cancelled f lights, accidents as well as incidents (Vickers et al., 2001). These authors posit that the aviation industry uses various types of visibility, which include: 1) horizontal visibility – the furthest visibility achieved horizontally in a particular direction by referencing objects or lights at known distances, 2) prevailing visibility – the ground level visibility which is common to one-half or more of the horizon loop, 3) vertical visibility – the maximum visibility achieved by looking vertically upwards into a surface-based impediment such as mist or snow, 4) slant visibility – visibility achieved by looking forward and downwards from the cockpit of the aircraft, and 5) flight visibility – the standard range of visibility at any given time forward form the cockpit of an aircraft in flight. Reduced visibility is caused by a multiplicity of factors, including lithometers (dry particles suspended in the atmosphere, such as haze, smoke, sand and dust) , precipitation, fog (radiation fog, frontal fog, steam fog, advection fog and ice fog), as well as snow squalls and streamers (Vickers et al., 2001). As already mentioned, low visibility leads to flight cancellations, fuel wastage as aircraft is unable to land in designated destination, aircraft damage in midair collisions, and deaths resulting from aircraft accidents (Watson, Ramirez Salud, 2009). Volcanic Ash The 2011 massive flight cancellations in Europe that were triggered by airborne volcanic ash from the Grimsvotn volcano in Iceland prove that volcanic ash is a major hazard to aviation safety at all levels. Indeed, â€Å"†¦like fine-grained mineral dust, volcanic ash affects radiative forcing and climate, public health, vegetation, and can cause property damage and disruption to community infrastructure† (Hadley, Hufford Simpson, 2004, p. 829). The major problem with volcanic ash emanates from the fact that onboard aircraft radars are unable to detect concentra ted ash within or near eruption plumes, leading to life-threatening encounters, huge losses in flight cancellations, and aircraft damage (Simpson et al., 2002).Advertising Looking for essay on aviation? Let's see if we can help you! Get your first paper with 15% OFF Learn More The damage caused by volcanic ash often calls for expensive repairs or total equipment replacement, thus it is of outmost importance for flight crew to ensure total avoidance of the ash for flight safety. What’s more, the pumice material contained in volcanic dust acts to abrade the aircraft’s leading edges (i.e. wings, struts, and turbine blades) to a point where the aircraft can cause a fatal accident if no replacement is done (Vickers et al., 2001). Icing or Icy Weather Schreiner (2007) acknowledges that â€Å"†¦icy weather, including ice pellets and cloud droplets that freeze on contact, affects air travel all over the world, especially during colder months† (p. 152). Aircraft icing takes place when supercooled water droplets from the atmosphere hit an aircraft whose body temperature is colder than 0oC, crystallizing into ice and occasioning serious detrimental effects that often expose an aviator to the real probability of causing an accident (World Me teorological Association, 2007). The two most important meteorological factors that affect icing include liquid water content of the cloud and temperature structure in the cloud. Some of the detrimental effects caused by icing include: 1) restriction of visibility as windshear glazes over, 2) disturbance of the smooth laminar air flow over the aircraft wings, occasioning a decrease in lift and an increase in the stall speed, 3) increase in aircraft weight and drug, hence decreasing fuel efficiency, and 4) incomplete or absolute blockage of pitot heads and static ports, thereby allowing erroneous instrument readings (Vickers et al., 2001). A study conducted by the NTSB demonstrates that approximately 819 people lost their lives in accidents linked to in-flight icing between 1982 and 2000 (Schreiner, 2007). Heavy Rain Although there is no agreed upon definition regarding rainfall intensity, heavy rainfall is defined in the literature as rates in excess of 4 mm per hours, while heavy s howers are perceived as rates in excess of 10 mm per hour (World Meteorological Association, 2007). Heavy showers, which are often associated with thunderstorms, qualify to be seen in the context of a meteorological hazard to aircraft due to their capacity to not only reduce physical and canopy/windscreen visibility, but also permit water ingestion into the cabin/cockpit/engine partitions of light, non pressurized aircraft, thereby endangering the effective and efficient operations of electronic equipment within the aircraft. There exists a possibility for aircraft turbine engines to ‘flame out’ and cause destructive effects under conditions of extreme rainfall and subsequent water ingestion (World Meteorological Association, 2007). Additionally, it has been reported that intense rainfall affects aircraft braking mechanism and may cause the aircraft to skid off the runway during takeoff and landing (Vickers et al., 2001). Duststorms/Sandstorms Duststorms and sandstorms, according to the World Meteorological Association (2007), are regions of raised dust and sand due to intense wind activity. The particles are propelled to different altitudes depending on the speed, instability and resolution of the wind flow, in line with the principle that smaller and lighter elements are lifted more readily and to much more elevated altitudes than weighty elements. Duststorms and sandstorms bring potentially destructive outcomes in aviation, such as reduced visibility, reduction of engine power in the event of dust and sand ingestion into aircraft engines, costly repairs, and aircraft crash in the event of a complete engine lockdown (Hadley et al., 2004; World Meteorological Association, 2007). Conclusion The paper set out to critically discuss some of the well known meteorological hazards in the aviation industry. It has been sufficiently demonstrated how normal meteorological processes, such as windshear, thunderstorms, visibility, volcanic ash, icing, heavy r ain, as well as duststorms and sandstorms, operate to become potential hazards in aviation. The potentially destructive outcomes arising from the different meteorological processes have been discussed at length, with the results demonstrating that many meteorological hazards lead to loss of life through aircraft accidents, loss of profits through frequent flight cancellations and rescheduling, loss of aircraft through structural damages, as well as costly repairs. It should therefore be the task of meteorology experts to conduct intense awareness campaigns in the aviation industry regarding the serious issues posed by meteorological vulnerabilities. Reference List Broc, A., Delannoy, A., Montreuil, E., Lalande, P., Laroche, P. (2005). Lighting strike to helicopters during winter thunderstorms over North Sea. Aerospace Science Technology, 9(8), 686-691. Hadley, D., Hufford, G.L., Simpson, J.J. (2004). Resuspension of relic volcanic ash and dust from Katmai: Still an aviation hazar d. Weather Forecasting, 19(5), 829-840. Harding, K. (2011). Thunderstorm formation and aviation hazards. National Weather Service. Retrieved from https://aviationweather.gov/general/pubs/front/docs/jul-11.pdf Schreiner, P. (2007). Enhanced icing product to guide aircraft around hazards. Bulletin of the American Meteorological Society, 88(2), 152-154. Simpson, J.J., Hufford, G.L., Pieri, D., Servranckx, R., Berg, J.S., Baver, C. (2002). The February 2001 eruption of Mount Cleveland, Alaska: A case study of an aviation hazard. Weather Forecasting, 17(4) 691-704. Vickers, G., Buzza, S., Schimidt, A., Mullock, J. (2001). The weather of the Canadian Prairies. Ottawa, Ontario: NAV Canada. Watson, A., Ramirez, C.V., Salud, E. (2009). Predicting visibility of aircraft. PLoS ONE, 4(5), 1-16. Witiw, M.R., Lanier, R.C., Crooks, K.A. (2003). Integrating human factors into the human-computer interface: How best to display meteorological information for critical aviation decision-making and performance. Journal of Air Transportation, 8(2), 129-138. World Meteorological Organization. (2007). Aviation Hazards. WMO/TD-No. 1390. Web. This essay on Meteorological Hazards in Aviation was written and submitted by user M1cr0ch1p to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

Java vs C++ essays

Java vs C++ essays Since their inception, computers have played an increasingly important role in todays society. Advancements in technology have enabled computers to become faster and cheaper. Today, the majority of families own a home computer that is vastly more powerful than giant mainframes of years gone by. Computer hardware has been evolving rapidly with no end in sight, and with all of the advancements in computer hardware come advancements in computer software; gone are the days when FORTRAN and COBOL were the languages of choice. Today,vvv two hot new object oriented programming languages have entered the computer programming arena, Java and C++, this paper will examine the similarities and differences between these new languages. Both Java and C++ are object oriented programming languages, but what does that mean? Object oriented programming (OOP) emphasizes data, instead of algorithms for solving problems. Instead of trying to fit a problem to the procedural approach of a language, OOP attempts to fit the language to the problem, in other words, OOP is structured to produce an answer without changing the question. Object oriented programming involves two separate parts, class and objects. Class is a specification that describes a new data form, it is a template that defines how an object will look and behave.(Kaj 1996, 8) An object is that particular data structure constructed using the parameters defined by class.(Prata 1995, 5) The object oriented programming approach to program design is to first design classes that accurately represent those things with which the program deals. A drawing program, for example, might define classes to represent rectangles, lines, circles, brushes, pens, and the like. The class definitions, recall, include a descriptions of permissible options for each class, such as moving a circle or rotating a line.(Prata 1995, 5) The main advantages of OOP, besides being able to create more compl...

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Information Technology Enhanced Management of Schools Dissertation

Information Technology Enhanced Management of Schools - Dissertation Example What is necessary to overcome the aforementioned obstacle may be roundtable discussions at many of the nation’s schools, where committee members meet to identify and discuss the issues at hand. Among things to consider is what is and what is not doable at the hands of a particular school, a definition of what it means to be productive in an academic sense, and a definition of how information technology may enhance that definition (Massy and Zemsky, 2008). â€Å"First, the demand for IT-based teaching and learning programs will grow substantially, probably exponentially, over the next decade. In an economy that is itself increasingly knowledge-based, the new information technologies offer an economical means of providing the continuous education the U.S. now requires as well as a more readily accessible form of post-secondary education and credentialing. Second, IT will change teaching and learning profoundly, no matter what the response of traditional higher education institutions. Just as the development of the printing press forever changed the teaching enterprise, IT represents a fundamental change in the basic technology of teaching and learning† (Massy and Zemsky, 2008, pg. 1). Information technology itself offers a large amount of potential, but it requires a fundamental shift in the way institutions operate. It is essential, then, that those who wish to implement information technology within an institution understand what changes must take place on levels that are practical to that institution. The first step is to take a look at the pros and cons of the integration of information technology into a school, including both administrative and teaching processes. Then, any barriers the school may face when integrating that technology must be considered on both an internal and external level (Massy and Zemsky, 2008; Armstrong, 2007; and Estabrooks, 1995). Schools across the nation are encountering many difficulties when they attempt to adopt a variety of new technologies. First of all, should information technology comprise the primary means of teaching students in today's elementary schools Second, should entire school systems be technologically enhanced Third, how is all of this going to be paid for (Kumpulainen and Wray, 2002 and Olson, Malone,

Personal statement Example | Topics and Well Written Essays - 500 words - 42

Personal Statement Example Through wide reading about issues pertaining to human relations across different parts of the globe, I have come to realise that law is an indispensable component of our lives. In fact, it is an integral part of our lives. I am strongly convinced that societies could not be governable the absence of law. To that effect, different laws are promulgated by different nations in order to govern the conduct of human behaviour so that they do not transgress against the standard expectations with regard to how they should behave. However, law is one subject area that is often misunderstood by many people. Basically, law is designed for people and by people but it seems that many individuals often fail to interpret law correctly. As a result, their rights may be violated through ignorance of the law. Against this background, I have developed a keen interest in understanding and mastering different aspects of law particularly the concept of corporate law. This is a new dispensation in law and I would like to gain more knowledge and insight about it. Currently, I am a final year law student and I have a keen interest in pursuing my studies in the same area. After completion of my first degree, I would like to proceed to Masters Degree in corporate law from a reputable institution. I have been greatly inspired by the education system in England and I can proudly say that I would like to pursue my Masters Degree in law in this great country. I have been attracted to this country through numerous visits that my family and I have had from my early childhood. Along the years, I became familiar with its streets, buildings shops and the ideology of its people and how to deal with them. Moreover, I love the language, especially after attending an English school in my country. The UK is also known for its prestigious academics, having numerous universities ranking top in the world. I am convinced that the British curriculum is

The Importance Of Street Lighting Construction Essay

The Importance Of Street Lighting Construction Essay Chapter 1 INTRODUCTION 1.1 Introduction Street lighting ensures safety to literally every citizen in Sri Lanka by providing guidance and direction across the vast territories throughout the country. Citizens have grown accustomed to driving the streets, rural roads and busy urban thoroughfares, relying on improved visibility and safety afforded them by generous lighting conditions provided by several street light standards of the roadways. Similarly, the safety and ability to maneuver along walkways and sidewalks, in both congested and remote areas, is tremendously enhanced for pedestrians and cyclists. Street lights must be designed therefore to minimize glare and render enhanced colour recognition to meet peoples visual needs in observing objects. 1.2 Importance of Street Lighting Street lighting is an essential public service that provides a safer environment at nighttime to commuters as well as pedestrians. Proper use of street lighting can be considered as a protective method which provides economic and social benefits to the people including: Elimination in night time accidents and economic loss Aid to police protection and enhanced sense of personal security Facilitation of smooth traffic flow Promotion of business activities and the use of public interactions during the night hours. While this service is commonly available in developed countries, there is a shortage of proper street lighting facilities in many areas in developing countries due to lack of financial resources. The lack of adequate light at night has given rise to poor living conditions and as such, street crimes, and other mishaps are commonplace. Street lighting is perhaps more interesting topic for politicians to gain their supporters. It is the most conversable topic among people and essential activity of local authorities, Pradesheya Sabhas and municipalities where the electrical consumption can be considered as having a totally stable load pattern (kWh) during designated operating hours for each and every day. The number of lights and power requirements stay relatively steady over the nightly operating period. The only real variation is the quantity of operating hours each evening as determined by the time of the year. On the other hand, some degree of weather is varying where photo cell control systems exist during dark and misty time periods where areas like upcountry. As such, we have very predictable load patterns and energy values for street lighting that mostly operate including peak power extracting time periods considering the Ceylon Electricity Board (CEB) national grid. One opportunity to address the demand-side of this issue is to save electricity via technological upgrades of street lighting with the help of municipalities and local authorities. Electricity used for streetlights accounts for up to 1.1% of electricity used by national grid stated in Statistical digest in 2011, published by CEB. It is worth noting that large amount of non-metered street lighting profiles exhibit a steady state operation on a month by month basis despite the fact that the new street lamp installations have been grown by 30% annually as revealed by street lamp census in 2010. This strategy will be worst during the election periods. Thus, the virtual billing value which is submitted by local authorities to the power and energy ministry, do not truly represent the actual load profiles. In response to the plotting of the billing information, both municipalities and local authorities have to be taken action to ensure true representation of load profiles with representing of CEB personnel to witness the actual requirements of the street lighting equipments. The electrical energy consumption of street lighting constitutes an important part of total energy consumption. Saving energy in street lamps is therefore important for total energy savings. It is known that street lighting levels are excessive in many cases. For instance, in the case of low traffic volumes, the lighting levels are excessive and could be reduced so that energy savings can be achieved. On the other hand, in specific situations and for traffic safety reasons, light levels should be increased even in the case of low traffic volume. Reductions in energy consumption through the installation of modern lighting equipment, control and management practices have a direct impact on the level of greenhouse gas emissions from street lighting. Reductions in greenhouse gas emissions are directly related to reductions in energy consumption; hence the potential savings are of the same order and vice versa. 1.3 Motivation This research keeps the focus on energy efficiency measures in the street lighting sector. The street lighting situation in Sri Lanka is still largely dominated by inefficient technologies, most importantly standard incandescent, low efficiency fluorescent tube or mercury and sodium vapour lamps. Although cost-effective when regarded over the full lifespan of the lamp, more efficient options, such as light emitting diodes (LEDs), induction lamps and solar powered systems struggle to penetrate the market. Several promotion programs for energy efficient lighting can be found by the government in recent past ( reference). This research is concerned with possibilities to promote the approach of energy efficient street lighting technologies for grid-connected or off grid usage in Sri Lanka. This approach is initiated to evaluate the economic, technical, and operational feasibility of replacing the existing street lamps with LED light sources. Specifically, the following areas were evaluated as part of this research: Energy and maintenance cost savings of LED lamps over the existing street lamps Energy and maintenance cost savings of solar powered LED lamps over the existing street lamps Optimum luminance that should be maintained on various roads and streets in compliance with British and IESNA standards and comparable those to the streets lighted by the existing High Pressure Sodium (HPS) vapour lamps which were installed in most of the town and highly congested areas where more luminance is needed. Cost-effectiveness of deploying a photocell or timer switching for street lamp operation. The energy and maintenance cost savings are key inputs to the cost-effectiveness analysis of LED. The performance metrics in the economic analysis includes simple payback as well as the net present value of cost savings over the lifetime of the LED fixtures. This research findings point out the key market barriers for technology uptake in the street lighting sector and discusses the current state of technology promotional programs. 1.4 Objectives of the research The first objective of the research is to get an inventory verification of various kinds of street lamps connected in all over the country and secondly, to analyze the performance of existing lamps and its control systems. Road surface luminance is one of the control parameters in intelligent road lighting control systems. The third objective is to identify the optimized luminance intensity on the roads as part of assessment for efficient street lighting systems. The final objective is to find a best option for energy efficient street lighting. At present, in urban roadway lighting applications, High Pressure Sodium (HPS) and mercury vapour lamps which are the most widely used light sources. In semi urban and rural area road lighting, fluorescent lamps and CFL is widely applied. LEDs are fast developing light sources and are considered as one promising light source for general lighting. However, LEDs are not used already for street lighting applications in Sri Lanka, since the initial cost of LED is very high as yet. Currently, HPS lamps are the dominant light source used in street lighting because of long lamp life time and high luminous efficacy. The research assessment is a comparative life cycle assessment including other economical analysis which was performed on Incandescent lamp, Fluorescent lamp, High Pressure Sodium (HPS) lamp, Mercury Vapour lamp, Induction lamp and Light Emitting Diode (LED) streetlight technologies. It also focused on the categories of energy efficiency, light quality, global warming affects ect. The majority of streetlights are individually controlled by manual operation and some are by photocell and timer switch. It is revealed that some local authorities such as Colombo Municipal Council (CMC), have installed and upgraded a system that allow light levels to be controlled in certain time periods in addition to the photocell operation. Maintenance of streetlights consists almost entirely of replacing burnt bulbs or other defective components. Lights controlled by photocell are not monitored remotely in Sri Lanka and are replaced when reported by complaints of people or noticed during regular inspections. Bulb replacement is performed by relevant local authorities or municipalities. 1.5 Outline of this Report This research conducted a detailed study of how to implement an energy efficient street lighting technologies in Sri Lanka. This study provides the data and analysis necessary to evaluate whether changing existing street lighting system is a worthwhile investment, not only economically but environmentally as well. The adoption of newer technologies could save the millions of rupees in each year by minimizing both energy and environmental costs while reserving them to invest in other infrastructure upgrades. This thesis consists of seven chapters including the literature review, methodology, case studies, economic analysis and results, and discussion. The literature review is the chapter 2 which explains the basics behind street lighting, the different types of lighting technologies, how they work, how they affect the environment, and how they meet current lighting requirements along with their advantages and disadvantages. The methodology chapter explains how the study was conducted with a detailed explanation of both methodologies and economic calculations. This chapter presented a series of calculations to verify the data which are relevant to this study. How the data was applied to these methodologies will also be explained in chapter 3. This research thesis consists of three case studies. First one is the basic structure of this thesis, so that, the street lamp survey conducted to find out the total no of lamps in the country. It gives a basic understanding of the main end-use applications and target sectors of the different lamp types, control systems and an idea of the energy efficiency potential available in the street lighting sector. The second is illumination evaluation for HPS lamps connected in Galle road section. The auto operated street lighting system implemented in Balangoda town area and street lighting control system conducting in Sri Lanka also discussed as the case study 3 in this chapter. All these case studies are presented in chapter 4. The chapter 5 consists of economic analysis for all case studies and sets the insights gained throughout the research is enlightened by economic analysis. The economic performance was calculated as simple-payback for substitution of LED and solar powered LED soluti ons to the existing lamps that includes in accounting for lamp life-span, maintenance costs, and electrical costs. Conclusion chapter covers the results from the study to include their sensitivity to changes in costs associated with power production, maintenance costs, fixture costs, and service life. Environmental costs with carbon emissions savings and impacts were also calculated and discussed with regards to the different lighting technologies including solar powered stand along LED system. Finally, discussion chapter reviews the findings of this study and recommends the course of action that should be taken for implementation of energy efficient street lighting along with areas for future research.

Eudora Weltys A Worn Path Essay -- Eudora Welty Worn Path Essays Pap

Eudora Welty's A Worn Path Eudora Welty's 'A Worn Path' is a story that emphasizes the natural symbolism of the surroundings. As the story begins, we are introduced to our main character, Phoenix Jackson; she is described as a small, old Negro woman. I believe that the name Eudora Welty gives our main character is very symbolic. The legend of the Phoenix is about a fabled sacred bird of ancient Egyptians. The bird is said to come out of Arabia every 500 years to Heliopolis, where it burned itself on the altar and rose again from its ashes, young and beautiful. Phoenix, the women in the story, represents the myth of the bird because she is described as being elderly and near the end of her life. Phoenix can hardly walk and uses a cane made of an old umbrella to aid her. Her skin is described as old and wrinkly, but yet with a golden color running beneath it 'Her skin had a pattern all its own of numberless branching wrinkles and as though a whole little tree stood in the middle of her forehead, but a golden col or ran underneath?(55). Her skin tone represents the golden feathers of the Phoenix and her grandson represents the next Phoenix that will be given life when she dies. The trip to the city to get the medicine represents the mythological trip that the Phoenix takes to the sun to die. Most likely this journey along a worn path through the woods, will be one of her last. We are told of Phoenix?s journey into the woods on a cold December morning. Although we are know that she is traveling through woodland, the author refrains from telling us the reason for this journey. In the midst of Phoenix?s travels, Eudora Welty describes the scene: ?Deep, deep the road went down between the high green-colored banks. Overhead the live-oaks met, and it was as dark as a cave? (Welty 55). The gloomy darkness that the author has created to surround Phoenix in this scene is quite a contrast to the small Negro woman?s positive outlook; Phoenix is a very determined person who is full of life. As Phoenix begins to walk down the dark path, a black dog approaches her from a patch of weeds near a ditch. As he comes toward her, Phoenix is startled and compelled to defend herself: ?she only hit him a little with her cane. Over she went in the ditch, like a little puff of milk-weed? (55). Here, the author contrasts the main character?s strong will with her small, frail phys... ...ppen to you? (57). I believe that this line represents a change that has occurred within the hunters mind. He no longer is trying to prevent her from her journey, while he still tells her to stay home, he know she is bound to go on. After there meeting he realizes how strong her will is and lets her go on her way. ?I bound to go on my way, mister? (57) Phoenix tells the man, and they go off in different directions. Strength is the only reason Phoenix accomplished her journey and Phoenix's love for her only living relative is her greatest strength of all. Although the old Negro woman suffers from many handicaps, she starts her journey mentally prepared for the obstacles awaiting her. Phoenix uses her inner strengths and prevails over every barrier. She relies on her trustworthy feet to make up for her impaired vision. Her wit makes up for her frail body. Her determination makes up for her aged memory. But most of all, her love for her grandson her keeps her going. Clearly, the frail, forgetful, and loving old woman can overcome anything. Works Cited: Welty, Eudora. "A Worn Path." The Collected Stories of Eudora Welty. New York: Harcourt Brace Jovanovich, 1980. 142-49.