Power Line Communication Essay

The objective any mining company like TATA STEEL is to reduce the amount of energy used in mining through the increase in employee productivity and safety. Mining operations consist of several tasks. The highest efficiency can only be achieved with full coordination among the persons carrying out these tasks and if the locations of vehicles and people are known by those who coordinate the activities. In addition, the large number of risks of explosion has the potential to cause a major accident. Therefore, the establishment of a better communication system for the mine underground is very important and significant to modernize the mine management, increase the labour productivity, and strengthen the security to protect the lives and property of the mines. Present Scenario At present, cable telephone communication, power line communication, sensor communication, telecommunication, leakage communication, and radio communication are the main forms of communication in a mine. Our study shows that, a variety of mobile communication methods have their limitary application under coal mine. Some mines still use hardwired wall-mounted telephones. The disadvantage of this technology is the obvious necessity that the user cannot be mobile. To reach this person, the caller must page the person who must then go to a wall-mounted telephone that may be a long distance away and in the case of an accident the telephone may be inaccessible to the injured person. Another popular technology , Leaky Feeder technology requires a relatively stiff,hard-to-install cable, about 5/8† in diameter, to be installed everywhere where communication is desired. To communicate the user must be in line-of-sight of the cable and not more than thirty or eighty feet away from the cable. According to a survey conducted on how well current systems meet the needs for mining communication, 62 percent of Respondents replied negatively. None of them thought that mining communication needs were being met extremely well. Some of their replies- â€Å"Overall we cannot communicate well with miners.† â€Å"There is the issue of battery, phone and wiring maintenance.† â€Å"Safety in an emergency is still an issue.† As the power lines in an underground mine cover a broad area, if we can make full use of power lines to communicate, then we can completely solve the problem underground communication. The use of power lines saves the cost of additional cable and the labour cost for system installation. Furthermore, power lines are built and installed in a rugged manner. Any underground wire or cable, when fed an RF signal, tends to distribute that signal throughout its length. Carrier current systems utilize this fact to establish communication paths using existing mine wiring. Carrier current devices are basically FM radio transceivers that transmit and receive over existing mine wiring instead of using an antenna system. The LF (low-frequency) and MF (medium frequency)KP ranges propagate best in carrier current systems. A common example of a carrier current system is the trolley carrier phone systems presently used in many mines. Another example is the shaft communication systems that utilize the hoist rope itself to establish communications to and from the cage. The most modern system, based on MF, promises to be the most effective of a l l . But there are lots of complex interference noises in power line communication under mine. More recently, the maturity of wireless as an accepted medium has increased the demand for instant, reliable, portable communication. Underground mines, however, have proved resistant to wireless communication due to environmental conditions that limit the transmission of radio waves. â€Å"Mines are looking to find such a system. It would become universal over time due to safety, a decrease in down time and an increase in productivity.† This system may be further enhanced to A GPS-like (Global Positioning System) for underground mines which would serve an extremely useful function in saving energy in mining operations. Autonomous (i.e. unmanned) machinery has been a long-standing objective of the mining. This would move miners from underground mines to the surface from where they would remotely control mining operations. Extremely important is to note that such a move would allow shutting off the energy-guzzling fans, which would result in large amounts of energy savings. Economics PLC is viewed as especially attractive because of several characteristics. Electricity services in most developing countries have higher reach than telephony. In addition, PLC can provide an elegant solution for in-home access and networking, since the signal can reach virtually any outlet in the home. However, there are several important technical issues in this simple scheme. The signal attenuates as it goes over the line, with higher losses at higher frequencies. Given emission limits that restrict boosting the transmission signal, the only solution is the use of repeaters en-route, increasing the cost. Secondly, the LV transformers act as a low-pass filter, allowing electricity through with low losses but not higher frequencies. This is why most solutions rely on bypassing the distribution transformer. While an opportunity in terms of sharing capital equipment costs across users, shared infrastructures also lead to congestion, multiplexing, interference, and security concerns. To overcome these issues, PLC solutions rely on sophisticated signal processing and encoding. For PLC to be successful, it must not only operate successfully from a technology point of view, but also present a viable business case. The market space consists of not only well-entrenched alternatives like DSL (Digital Subscriber Line) and cable, but also alternatives such as Fibre-To-The-Home (FTTH), Fiber-To-The-Curb (FTTC), and broadband wireless. Issues of telecom, regulation and competition play a vital role in deciding the future of PLC. Depending on the number of feeders emanating from the substation, different MV couplers are needed. At every distribution transformer, a concentrator cum transformer bypass is required. This device transfers the signals to the medium-voltage line, bypassing the transformer. In addition, depending on the distances involved, repeaters might be needed to extend the signal. In addition to the one-time costs, which are amortized over specific periods, there are also explicit calculations of monthly operating costs. After thorough estimation from various sources (web and consulting some industry people) the monthly costs of PLC is found to be around US$35 per month per user. Most of the values chosen are plausible, if not optimistic. In some hazardous locations, where specialized personnel are required, installation costs have been estimated at US$200–300. On the other hand, in normal cases, the installation would be somewhat over US$100 per user . The total capital costs per consumer (excluding Customer Premises Equipment (CPE)) average about US$85 , assuming an average of 6 homes passed per LV transformer. One result that is robust across most assumption ranges is that operating expenditures are about 45% of the total costs. The most important variable, under the assumptions is the time period for paying off of the equipment. Given the fast changing nature of the telecom industry, the median value for economic purposes is assumed to be 5 years. In addition, within a region, the competitive pressures might be much lower, allowing for higher market share and greater sharing of equipment, marketing, and maintenance costs amongst subscribers. Given the estimated monthly costs of PLC it is almost clear that there is a gripping business case for PLC in the near term based on price for the end-user. Of course, economics is not the only factor in determining the success of PLC or any other broadband technology. User satisfaction, customer loyalty, branding, and competition (alternatives) are all important factors as well.

Arthur Miller wrote the play Essay

What Miller does do to excellent effect is keep the pace of the plot speeding along and twisting in different directions all the time, at one time the focal point is on Danforth and his control of the court, then at another it is Abigail and the girls feigning that Mary Warren’s spirit has possessed them. Throughout this extract he keeps the dramatic effect by having many different plot lines run into each other at this point; Proctor’s attempt to save Elizabeth, Mary Warren’s declaration that the girls are putting on a show and Abigail Williams’ and the girls dramatic role-play claiming Mary Warren is sending her spirit out on them. All of these plot lines are intertwined in the court room scene and are exposed in John Proctor’s announcement that he is guilty of lechery. Some of the central themes and concerns in The Crucible are evident in this extract intolerance, being a society run strictly by a theocracy means that Salem is run by strict laws and religion. Any wavering outside these rules or religious thoughts is unacceptable. Danforth is intolerant when listening to Proctor and Giles Corey’s attempted reasoning and proposals. Salem at this time was intolerant of any un-natural endeavours, just as America in the 1950’s was intolerant of any un-American activities or communists. Acts of search and arrest became known as McCarthyism, led by Senator John McCarthy. Hanging those who were accused was seen as restoring purity to the theocracy in Salem. Another recurring theme in The Crucible is that of personal reputation. In this extract Proctor seeks to keep his name from being tarnished by giving testament against Abigail claiming that she is delivering her accusations through jealousy of his wife Elizabeth, and by announcing that he has committed adultery through his affair with Abigail. Reverend Parris acts only on what he thinks is best for his reputation throughout the whole play, particularly in this extract when he lies about seeing the girls naked dancing in the woods, â€Å"I do not deny they danced, but I never saw any of them naked†. Parris lies in order to keep his reputation, for if it were released that he had found his daughter and many other girls dancing naked in the woods and ‘compacting with the devil’ then he would be driven from his office as the reverend of Salem. Judges Danforth and Hathorne are both unwilling to accept that Proctor is innocent and do not want to admit to being deceived by a bunch of girls claiming witchcraft and are therefore forced to charge John Proctor to keep their own reputations, making the interrogation partial towards the young girls and unfair on Proctor. The other central theme of the play is the role that hysteria can play in societies. The lies by Abigail all the way through the play and particularly in this extract easily manipulate the judges and the residents of Salem to turn against the accused which ultimately leads to their executions. Miller has linked this hysterical theme to the McCarthyism period in which he lived in the 1950’s, the hysteria led by Senator Joseph McCarthy and his hunt for communists and communist sympathisers in post WWII America and during the Cold War. Miller seems to have based his character Judge Danforth on the individual Senator Joseph McCarthy: both are over-seeing the hysteria of the communities and are leading the search for the accused and presiding over their trials.

Clinical reflection Essay Example | Topics and Well Written Essays - 250 words

Clinical reflection - Essay Example From the experience with the Chinese patient, I learnt how to communicate with a non-English speaker patient by use of sign language. I also learnt how to keenly monitor how he swallowed the fluid foods and put great care to turn the patient after every two hours. I also learnt more in listening to the lungs sounds very keenly. My friendliness to the patients never failed me. It made the patient feel at home and feel comfortable on my arms. I think I did great job by ensuring that the patient was comfortable all the times. I also did much by ensuring that the patient never dirtied himself with his excretes since he was unable to handle himself. Throughout the nursing period I ensured close contact with the patient. Today as I attended to the Chinese patient I felt I was very effective and caring to my patient. I went extra mile since the patient was dependent. I felt the pain as the patient swallowed the meals in great trouble. It was sad to see the patient being turned on bed every time. I felt the pain though proved much confident and never indicated any sign of

Notes for thank you Esther Forbes Assignment Example | Topics and Well Written Essays - 750 words

Thank You, Esther Forbes - Assignment Example This research will begin with the information about some famous persons. Audrey Kathleen Hepburn was a British actress and later a humanitarian. She was acting during the Golden age of Hollywood and she was recognized highly as a fashion and film icon. To this date, Audrey is regarded as one of the best naturally beautiful women of all time. Further, the American Film Institute ranked her third in the greatest female screen legends list in American Cinema’s list and also is placed the Hall of Fame’s International Best Dressed List. Ernest Miller Hemmingway was an American journalist and an established author.   He won a Nobel Prize for literature in 1954. He had written seven novels, six short story collections and two non-fiction books all of which he had published and are considered as American classics. Some of his popular works include The Sun Also Rises, For Whom the Bell Tolls and The Old man and the Sea. Isaac Emmanuilovich Babel was a Russian literary translat or, a playwright, a journalist and a short story writer. Babel produced several masterpieces of Russian Literature those include the Red Cavalry, Tales of Odessa, and Story of My Dovecote which are very popular. Notably, he was not uncritical of the Communist Party of the Soviet Union but he was later arrested and shot dead in 1940 after confessing that he had been a foreign spy and a Trotskyist terrorist. Gertrude Stein was a pioneer and member of the Modernist Literature movement and she is well known as an American plays, poetry and novels writer. In specific, she wrote the Autobiography of Alice B. Toklas which was a literally best seller and that made her get attention as a mainstream literally figure. She was also regarded as a modernist art collector. Henry Green is best remembered as an English author who wrote the popular novels Loving and Party Going.   Between 1905 and the year 1973, he was Henry Vincent Yorke's ‘nom de plume'. Greens novel’s, especially Li ving, Loving and Party going are considered basic works in the works of English in the Modernist Literature.

Food Prices Essay Example | Topics and Well Written Essays - 1000 words

Food Prices - Essay Example There are many reasons for this sharp increase in the prices of food especially and a valid economic justification may not be provided to accurately outline the factors behind the increase in the food prices. Development of alternative fuel i.e. bio-diesel, low crop yields due to bad weather in major commodity producing countries as well as the higher demand from developed as well as emerging countries, all resulted into food inflation. Besides, the recession in US economy, one of the largest importers of commodities, is also cited as one of the major reasons behind the sharp increase in the food prices as there has been substantial crises being faced by US economy over the period of almost two years. The increase in food prices can be traced back to last two years as FAO food Index rose by 9% in 2006 and 23% in 2007. (IFAD, 2008). This sharp increase suggests that there is a great increase in the prices of food items all over the world and many important factors are at play which is pushing the prices up. In order to make an economic analysis of this increase, we will outline and discuss different factors causing the prices to go up. (The World Bank, 2008) There is a general increase in the concern being shown over the impact of greenhouse gases over the environment of the world. This, coupled with depleting oil resources of the world, has forced many developed nations to look for alternative sources of energy to fulfill the future energy needs of the planet. Bio-diesel is one such alternative which has been advocated as the potential replacement of oil as a source of energy. However, this shift towards finding alternative sources has greatly increased the demand for the food items especially rice, sugarcane and corn -the commodities which are now heavily used in producing bio-diesel. This increase in quantity demanded for rice and sugarcane especially have seen a great deal of increase due to increase demand from developed countries. (Economist, 2007). It is also important to mention that increasing subsidies on ethanol in developed world have increased the overall demand for sugarcane because it's now being used for producing ethanol rather than sugar. (Buntrock, 2007) It is also important to note that due to greater demand from developed world, developing countries, which are considered as the suppliers of basic food items in international market, started to export most of their produce resulting in strong shortage of the food commodities in their own countries. This shortage of essential food commodities, in developing countries, also put strong pressure on the prices to rise upward. Reduced Output According to IFAD, the available stocks of the cereals at the start of the year were very low. This, coupled with the reduction in the overall output level of major cereals by 6.9% in 2006, suggested a reduced supply of essential cereals in the market. (IFAD, 2008). This has been mainly attributed to the bad weather in major producing countries i.e. Brazil, Thailand, India etc causing acute shortage of cereals in the market therefore putting pressure on prices to go up drastically in such short span of time. Removal of Farm

Diet, Obesity and Physical Activity in children (literature review) Essay

Diet, Obesity and Physical Activity in children (literature review) - Essay Example These two factors of increased total energy intake and reduced physical provide the conditions that are conducive for the genetic defects trigger to act, leading to the rapid increase in obesity rates in children. The rising rate of obesity in children is a cause for health concerns around the world, with particular emphasis on the developed. It is no different in the case of Australia, where more and more children are becoming obese at a rapid rate. Estimates in recent times of the prevalence of obesity in Australia, show that the prevalence of obesity has virtually doubled in virtually a short period of time. This sudden increase in the prevalence has been put down to unhealthy dietary practices and the lack of physical exercise. The health concern with obesity in children is the tendency for obesity to continue into adulthood with all the attendant health risks due to obesity. (1). Obesity in children is reaching epidemic proportions. In about four decades between 1963 and 2004 obesity estimate rates in children show an alarming trend. In the adolescent age group it has more than tripled moving from five percent to seventeen percent, while in the age group of 6 – 11 years it has increased by nearly four times, moving from four percent to nineteen percent and in the age group of 2 – 5 years has almost trebled from five percent to fourteen percent. Current estimates from statistical data suggest that more than 22 million children below the age of five are either overweight or obese worldwide. The more pronounced statistical evidence of the growing epidemic of obesity is its rising rate even among infants in the age group 6 – 23 months, where the rate now is almost twelve percent. (2). Obesity in children was considered to be an aspect of the influence of affluence in the developed world, but such concepts are being proved wrong with the spectre of obesity looming large in

Beats by Dre Essay Example | Topics and Well Written Essays - 2000 words

Beats by Dre - Essay Example Furthermore, marketing 4 Ps are also critically illustrated after which the Asnoff Growth Matrix is used to illustrate the trends in business growth. Beats Electronics is a division of Apple Inc. that majorly specializes in the production of headphones and speakers (Monica, 2011, p. 01). These main products are branded ‘Beats by Dre.’ The operational headquarters of the organization are set in Culver City, California in the United States. Within the short time that the company has been in operation since 2008, the sales volumes have mainly been boosted by its vigorous marketing operations, especially in the United States (Wheeldon, 2014, p. 53). The marketing transactions are handled from a multi-angular approach which includes considerations of marketing mix elements, and the Asnoff Growth Matrix. Porter (1998) invented a model that is used to track marketing operations in all markets, irrespective of the items of trade that are involved (The National Agency for Innovation and Research in Luxembourg, 2008, p. 01). There are five major determinants which interact in a bid to control the level of operations within the business market. These in include competitive rivalry within the industry, threat of new entrants, threat of substitutes, suppliers’ bargaining power and bargaining power of the customers. The level of competition among firms within an industry directly determines the effectiveness of the sector. Each company strives as much as possible to retain or improve its positioning within the market. As a result, several competitive strategies may be used such as pricing strategies, customer care services, value addition and diversity among other approaches. An organization has to come up with appropriate strategies so as to manage the competitive forces within an industry. By all means, a company will devote all the available resources to create a barrier to any organization

Business Improvement and Creativity Essay Example | Topics and Well Written Essays - 2000 words

Business Improvement and Creativity - Essay Example To maintain the company’s market shares, the top management of RIM is being challenged to constantly improve its business processes and product quality and design. (See Appendix I – Summary of Mobile Phone Sales Volume Around the World on page 11) As part of analyzing the main drivers behind the business improvement of BlackBerry, this study will purposely analyze the theory behind John Kotter’s model of organizational change and DEbono’s six hat thinking. After critically analyzing these two particular business improvement theories, it will be applied in the case of RIM – BlackBerry. According to Nelson and Quick (2008, p. 416), organizational change is inevitable yet manageable. To compete in the market, implementing product innovation and organizational change is necessary (Sabri, Gupta and Beitler, 2007, p. viii). is commonly used in â€Å"planning, implementing, and sustaining change† (Sabri, Gupta and Beitler, 2007, p. 176). According to Kottler (1996), the eight steps towards a successful organizational change include: (1) establishing a sense of urgency; (2) creating a guiding coalition; (3) developing a vision and strategy for change; (4) communicating the vision and strategy for change; (5) empowering employees for action; (6) generating short-term wins; (7) consolidating gains and producing more change; and (8) anchoring change in organizational culture [cited in Sabri, Gupta and Beitler, 2007, p. 176]. (See Appendix II – Kotter’s Model of Organizational Change on page 12) The model presented by Kottler is clear and straight-forward. Using the SWOT matrix, this model encourages the managers to reflect on the need to implement organizational change (Kottler, 1996, p. 21). It also encourages the managers to use their leadership skills to effectively communicate the vision and strategy to persuade employees to support organizational

Camera Shots in The Great Gatsby Essay Example | Topics and Well Written Essays - 500 words

Camera Shots in The Great Gatsby - Essay Example This paper illustrates that the clip begins with an extreme long shot that brings Buchanan’s house into view. This shot is helpful in according a general impression of Buchanan’s opulence as the shot turns into a medium one. For instance, the long shot gives the audience a view of the green lawns and exquisite architecture that characterizes Tom’s house. It is notable that just before the scene, Carraway’s scene manifests as less dramatic since it is characterized by quick shots showing his dour residence and lush vegetation. The camera rapidly pans across the lake and it ushers the audience into Tom’s compound. The camera uses an eye-level position as Buchanan greets and hugs Carraway. The eye-level position accords the audience the immense figure of Buchanan. In addition, it introduces the audience to the brute nature and overconfident persona of Buchanan. Thereafter, a high-angle shot shows the audience into the splendor of Buchanan’s hous e and manifests the child-like nature of Daisy Buchanan and Jordan Baker. This shot precedes a close-up shot of Daisy’ hands. It is notable that Daisy is interested in letting Caraway observe the diamond ring on her index finger. Daisy manifests as a vain and superficial character whose beauty is the primary obsession in life. The camera tilts to remove an up-close shot of Daisy’s face. A properly lighted background that demonstrates her beautified face enables this shot. Thereafter, the camera pans into Carraway’s bewildered face and compliments with a medium shot that ushers his response to Daisy’s narcissistic questions. A slightly high angle shot gives the audience the view of Baker’s face and tilts along her tall frame as she stands up. It is notable that she is enacting impressions on Carraways. These camera movements manifest Baker’s attempts at appearing sophisticated more than she could be.