Factors Affecting the Efficiency of Ball Mill Essay Example for Free

Factors Affecting the Efficiency of Ball Mill Essay Ball mill is the key equipment for grinding after the crush process, and it is widely used in the manufacture industries, such as cement, silicate, new building material, refractory material, fertilizer, ferrous metal, nonferrous metal and glass ceramics, and ball mill also can be used for the dry and wet grinding for all kinds of ores and other grind-able materials. 1, The impact of media materialThe generally used crushing media mateial include: various mine materials (manganese, copper, tungsten ore, chrome ore, etc. ), various types of stone (limestone, granite, gneiss, basalt, gray rock, etc. and industry coal used in power. The hardness of the media is the main basis that determines the liner plate wear, the higher hardness of the media, the shorter service life of the liner, on the contrary, if the media is with a lower hardness, the service life of the liner will be prolonged. 2, The impact of operating conditions1) Eliminate defects not timely. 2) Adjusting undeservedly makes the ball mill running at a short positions. 3, The impact of liner materialThe main parameters affecting the anti-wear effect is matching of the two index of hardness and impacting toughness of liner material. If the liner plate has a higher hardness, which means it has a good wear resistance, and the two factor basically is a proportional relationship. The impacting energy depends on the size of the diameter of steel ball and grinding tube. 4, the impact of the ball mills designing and manufacturing and the installing quality. The performance of the lining plate generally include the following two: one is to protect the cylinder; another is that the liner plate rotates at a specific speed to raise the ball to the required height to achieve the desired effect. The quality of the liner plate is also direct factor affecting the normal operation of the mill. Those above are the main factors affecting ball mill liners, we recommend that you should firstly consult the expert before you buy a ball mill. And youd better go to the manufacturers with strength production and reputable brand purchase. The structure is divided into integral type and freestanding type. Advantages of the machine are lower investment, energy saving, structure novelty, easy and safe to operate, stable and reliable performance, etc. It is suitable for mixing and milling of general and special materials.

Research Proposal Essay Example for Free

Research Proposal Essay This research project is entitled ‘Safe pedestrian practices: the perception of children in Sri Lanka’. Road traffic accidents are one of leading causes of death amongst child pedestrians in low-income countries. Despite this, little research has been done into effective interventions to reduce child mortality in these countries. This study aims to provide original and useful data from Colombo, Sri Lanka which will help in the development of new or existing road safety interventions and education, particularly in relation to child knowledge and perception. The method of research involves recruiting school children aged 8-9 years from the Holy Family Convent and St. Peter’s College schools situated on Galle road, Colombo. These schools have been selected as they have similar location, one being a girls school, the other a boys school. The first part of the study involves a draw and write technique where the children will be asked to draw a picture of themselves crossing Galle road, the main road by their school. They will then be given a piece of paper with the instruction ‘tell me what you have drawn and why’. Six children from each class will be then purposively selected to take part in a focus group. Content analysis will be used when analysing this section of the results. Finally I will carry out a two day observation of child pedestrian behaviour on Galle road. Behaviour of the children will be compared using the UK’s Green Cross Code. It is estimated that the research will take approximately four weeks to complete. This includes, recruiting and gaining consent from the participants, carrying out the draw and write activity, completing two focus groups and carrying out the observational study. The estimated cost of this research  £1163. Background Road Traffic Accidents (RTAs) are one of the leading causes of morbidity and mortality worldwide with 86% of deaths occurring in low- and middle-income countries despite accounting for only 40% of motor vehicles[i]. RTAs are the overriding cause of child injuries killing approximately 180 000 children under 15 each year. Children are rarely the cause of road traffic accidents but suffer as pedestrians, cyclists and passengers[ii]. Lack of research in low-income countries has meant a slow introduction of effective intervention strategies to reduce the mortality rates. Many factors are accountable for the high RTA rates in low-income countries including impaired driving, lack of enforcement and vehicle type. However the most significant differences found in low-income countries are the wide variation in road vehicles and the high number of vulnerable road users. The mixture of road users including pedestrians, bicycles, handcarts, mopeds, rickshaws, motorcycles, vans, cars, trucks and buses means that schemes to combat this problem have not been required in the same extent in high-income countries and therefore local research is needed[iii]. Child pedestrians account for a large proportion of vulnerable road users. The high number of pedestrian and cyclist casualties in these countries reflects not only their inherent vulnerability but also insufficient attention to their needs in policy-making3. A study in Pakistan observed 250 pedestrians in the top 10 risk areas for pedestrian RTAs in Karachi. They observed walking and crossing the road and walking on the pavement. Only 60% of the pedestrians looked left and right before crossing. 52% crossed the street less than 2 seconds before a vehicle passed the point they had just crossed. 35% caused the traffic to swerve to avoid the observed pedestrian. Of the 250 pedestrians observed walking on the street edge, 82% had a pavement available to them but were not using it[iv]. Of the pedestrians using pavements 28% encountered an encroachment and 84% of these stepped on to the street to avoid it. Among those who were observed stepping on the road from the sidewalk, 66% did not look out for oncoming traffic4. Possible study limitations were that only pedestrian behaviour was studied, not actual accidents and the study sites were the top ten risk sites for RTAs in Karachi so may not be transferable to other situations. The advantage of this data is that it was carried out in a low-income country which means the findings can be drawn on for other settings. Policy changes such as restricting the amount of pavement space being used by stalls or shops and publicity to highlight the danger of such behaviour along with the important of observation when crossing roads may make a large difference to fatality rates. Risk perception has been widely studied as a risk factor for injuries however literature relating to child pedestrian safety is seriously lacking. Zeedyk et al[v] carried out research on children who had been taught a programme of road safety. They carried out two studies, both focussing on the skill of finding a safe place to cross the road. Firstly they tested the effect of the programme in improving knowledge and secondly whether the children transferred their knowledge to change their behaviour in a traffic environment. Initial results encouragingly showed that the interventions were effective in increasing the children’s knowledge of safe and dangerous places to cross roads and that this information was retained for six months. The second study however showed that this knowledge did not influence behaviour and that those children who had received knowledge on safety when crossing roads behaved no differently from those children who had receive no information whatsoever. That is the children were not applying the knowledge they had displayed during pre-testing5. The study’s main limitation is that it does not allow any further information on why the children didn’t apply their knowledge in the real situation, only that they didn’t. Research in Australia[vi] into the parental risk perceptions of childhood pedestrian road safety found that cultural risk factors significantly affected risk perception and safety behaviour. The results showed that Chinese and Arabic speaking parents perceived the road environment to be significantly less risky to their children than parents from the other two language groups. One significant limitation of this study is that assumptions were made that the language spoken by an individual was closely linked to their cultural make-up. Since the main finding was the differences between perceptions from different cultural groups it seems important that this factor is reliable. Despite this, this study reinforces the need for local research from which local interventions can be implemented. As described there is very little research on road safety in low-income countries, particularly regarding the safety of child pedestrians. Intervention strategies to help reduce child pedestrian mortality can only be implemented if the factors underlying the increasing rates are established. It is hoped this study will help to describe the behaviour and perceptions of children in a named area in Sri Lanka regarding safe pedestrian practice. The study will help build on existing knowledge of child pedestrian safety but provide an original and detailed description of the behaviour and perceptions of Sri Lankan children in a defined area. The data produced from this study will identify the knowledge and behaviour of child pedestrians, what they perceive to be safe practices and why they think this. This study anticipates highlighting the importance of child perception in safety behaviours. Child perceptions should be taken into account when considering the design of safety education programmes and road safety interventions. Research Question The background literature shows a clear gap in research into the behaviour, knowledge and perceptions of child pedestrians in low-income countries. The research question for this study is: Child pedestrian fatalities: the accountability of child perceptions in Sri Lanka The aim of this study is to discover the perceptions children in Sri Lanka have regarding road safety and specifically related to their own safety as pedestrians which may influence their risk of being involved in a RTA. The results of this study will enable a greater understanding of how a defined group of children in Colombo, Sri Lanka use the local roads, what they know about road safety, how they perceive it and therefore whether they generally behave in accordance to their knowledge and perceptions. This was discussed above by Zeedyk et al5 who found the knowledge of the children in their study did not affect their behaviour. The objectives of this study are to: Observe and record the road behaviour of children in the local area Identify what the children know about pedestrian safety Discover whether the children know why certain practices are safe Make comparisons between what the children know about road safety and say they are aware of and how they behave in the real situation Detailed Research Proposal pedestrian injury Children are particularly vulnerable to pedestrian death because they are exposed to traffic threats that exceed their cognitive, developmental, behavioral, physical and sensory abilities. This is exacerbated by the fact that parents overestimate their children’s pedestrian skills. Children are impulsive and have difficulty judging speed, spatial relations, and distance. Auditory and visual acuity, depth perception and proper scanning ability develop gradually and do not fully mature until at least age 10. Method RTA death rates in Sri Lanka totalled 11 per 100 000 population in 1995[vii] with pedestrian accidents accounting for 45% of the total fatal accidents, one of the highest rates in Asia[viii]. The research will be carried out among children in Sri Lanka. The selected site is Galle Road, Colombo which is the main road from Colombo to Galle along the west coast of Sri Lanka and is the location of a number of schools. The assumption will be made that the majority of child pedestrians walking alongside and crossing that particular road are from one of the local schools. The study population will be girls and boys aged 5-15 years old attending schools in Colombo, Sri Lanka. Research shows RTAs predominantly affect those under the age of 15 [ix]. Schools in Sri Lanka are commonly single sex which means children will be selected from 2 schools, St Peter’s College, a boys’ school and Holy Family Convent, a girls’ school. Worldwide, boys are more likely to be affected by RTAs than girls so studying boys and girls may highlight important differences which could account for such a difference between them[x] [xi]. I was unable to find any research indicating which children are most at risk of RTAs only that those under 15 are an increased risk compared to the rest of the population. Research from Canada suggests children aged 6-9 years are most at risk and in a survey on children’s road safety practice several countries including the UK, New Zealand and the US identified those under 10 as most at risk[xii]. Research such as this in low income countries is scarce. Consequently I have decided to select the age groups 7-8 and 9-10 years as my sample. The methods being used in this study have been deemed inappropriate for children under 6 to carry out. Two classes of children, aged 7-8 and 9-10 from each of the schools mentioned year group will be studied, giving a total of 4 classes. Variations in ages might allow for difference in safety knowledge due to age to be identified. For example if the younger children perceive a certain dangerous practice to be safe and the same results are found in the older children this may indicate a problem with safety education or local road dangers rather than naivety due to age.

Defining And Analysing Personhood

Defining And Analysing Personhood Person hood has always been an ill-defined term. The gray area between animal and person being one targeted and argued over since its original conception. It all seemed to begin with a proposition by John Locke, which constitutes that the rules governing personhood are: a thinking intelligent being, that has reason and reflection, and can consider itself as itself, the same thinking thing, in different times and places; which it does only by that consciousness which is inseparable from thinking.(MHR, p. 134) Then many philosophers began to develop, and retake Lockes definition and make it their own. Though, all of these people seemed to follow suite that the gray areas border lays upon the idea of our mind, our thoughts, and our memory. However, one person seems to completely disagree with the tradition Locke notions of personhood. Paul Snowdon is instead a member of the animalist belief. This belief is seemingly more straightforward when compared to Lockes ideas, as rather than putting its focus on the continuity of the mind; instead he believes it is the continuity of the body that defines one person now, as the same person later. Snowdon figured that if one tried to define the separation between the person and then animal in all of us, a grave issue would unfold. This is due to the ideas of one being able to separate the animal from the person, for if this idea is to happen, then one must also define the mental capability of the animal within the person. This is seemingly impossible. Thus the animalist believes that we are all organisms, and rather than create an identity separation between animals and persons, rather we are all animals on a scale of being. This idea has a very small following when compared to Lockes theory; however, there are still a few philosophers that disagree with Lockes rules and have come up with their own definition for personhood. Still many of these theories have disagreements with Snowdons principles, but there are a few I believe Snowdon has many agreements with. The one I think Snowdon would agree with the most is Annette Baier. Her ideas on personhood are against the principles of Locke, moreover statements show her disagreement with not only Locke, but many philosopher representing theories similar in Lockes belief Baier says that person tests too often reflect the narrow values of those who design them. (MHR, p.135). Both philosophers agree in their disagreement with Locke. Snowdon believes that one cannot decompose a person into a person and an animal without deficient results; likewise Baier believes that, due to person tests being set-up to reflect human nature, often philosophers put too much focus on the mental aspect of the creature, in many cases over the social interactions. Snowdons idea that separating a person into two is closely related with Baiers theory in that, they both represent the idea that animals and persons are one and the same, that it is only our human hierarchal needs that seemingly force us into the thought process that there must be a defining barrier between us, and the rest of creature kind. Furthermore, Baier says the emphasis of the tests on the cognitive conditions of personhood seems to imply that people can float free of their own history, dependency, mortality, and biology. (MHR, p. 135) all of these ideas she disagrees with. Snowdon would also surely disagree with all of these ideas, as he spoke of the impossible reasoning behind the transplanting of ones brain, not from a scientific viewpoint but from a theoretical one. Thus both philosophers agree in their own disagreements with the modern system of defining personhood. Finally, Baier decided to create her own naturalist view, of persons as embodied, interpersonally responsive, and dependent creatures. (MHR, p. 135) Though her view does not completely discredit the idea of persons, it does share many of its merits with Snowdons principles, whilst expanding his ideas to encompass a new form of personhood. For instance, with the mention of persons as embodied à ¢Ã¢â€š ¬Ã‚ ¦ creatures she is showing a similar opinion to that of Snowdons. The belief in that the continuity of our very bodies is a quite important aspect in the continuity of ourselves. One may also infer from her statements, that she believes it impossible to separate the person from the animal. That shows another level of agreement with Snowdons reasoning. With all this research on other philosophers ideas on personhood, it seems impossible to have not developed a theory of my own. However, my theory is more based upon the underlying structure philosophers should be forced to realise before arguing their ideas of personhood, rather than my own opinion on the matter. It seems that the consistent underlying structure among all these theories is based on separate classes of personhood, and what answers these classes wish to define. It seems though that most philosophers ignore these separate classes, and end up arguing that one theory holds illogical reasoning, even though this reasoning only seems illogical due to the theory attempting to solve an entirely different problem from their own. It seems that all this began due to Lockes overly generalised theory; he covered the classes of identity tests, person continuity, as well as ethical standings. Whereas realistically all these issues should be dealt with separately. The classes of personhood as I see them are answers to the following questions. What separates me now from me then? What separates me from an animal? When does personhood begin? (These are only a few personhood questions, however they seem to make up the common definitions, and would well enough for an example of my theory.) Now the real issue is that these questions are often attempted to be answered with the same solution, even though these questions have very different ethical backgrounds. One attempts to develop a way of making identity checks, whereas another tries to define a hierarchy of the species, finally one is trying to define when life begins. As an example of the confusion this error can often cause I will examine Lockes definition. a thinking intelligent being, that has reason and reflection, and can consider itself as itself, the same thinking thing, in different times and places; which it does only by that consciousness which is inseparable from thinking.(MHR, p. 134) He tries to solve the identity check question with the same thinking thing, in different times and places, or as discussed on Philosophy Bites, the memories of past events in ones life. However, he also tries to produce a solution to the problem of, what separates me from an animal? in saying a thinking intelligent being, that has reason and reflection, and can consider itself as itself. Thus even in Snowdons very own argument, many of his reasons are flawed, do to comparing one question to another. It is my belief that each of the questions should be answered separately, rather than trying to develop a solution that fails in answering all of them at once.

U.s Investment In Mexico :: essays research papers

U.S Investment in Mexico Economics 580 Dr. Leon Haitham Boukhadour Fall 96 Mexico has established itself as one of the biggest emerging markets in the world today. It has exhibited many of the signs of a high growth economy, offering several advantages to prospective investors. Some highlights of the Mexican economy include " single-digit inflation, a balanced public budget, real economic growth (presently at a rate of 12 percent), a deregulated economy and a favorable investment climate" (Risk Management/ June 94, P.32). Mexico also possesses a strategic geographic location as a gate way to Latin American markets. Mexico is among the fastest- growing export markets for the United States. In 1985, Mexico became the third largest market for total U.S. exports, behind Canada and Japan. In 1992, Mexico surpassed Japan as the second largest export market for U.S. manufactured goods. Mexico now accounts for $1 out of every $10 of total U.S. exports. After the passing of NAFTA, bilateral trade was quite balanced in 1994, with the U.S. registering a surplus of $1.3 billion, virtually unchanged from 1993. However, there was a sharp increase in trade opportunities, as both import and export growth exceeded 20 percent. One-fifth of the total trade that occurs between the United States and Mexico was created in 1994. One of the major sectors that holds a large promise for the U.S. manufacturers is that of the automobile industry. The Mexican market for auto parts is expected to grow by 24 percent from 1994 levels to $16.9 billion in the year 2000. It is also expected that NAFTA will help increase the U.S. export share of the Mexican market to around 70 percent by the year 2000. In the long run, Mexico's location could profit the U.S. industries that establish themselves there, through an expanded free trade area in Latin America, which could include Argentina, Brazil, Venezuela, and Chile. Such expansion could prove crucial to the U.S. industry, as a strong export orientation helped sustain industry growth. Exports increased from 18.5 percent of total output in 1989 to 27.2 percent in 1991. And the level of employment which could be attributed to exports increased from 116,500 in 1989 to 154,200 in 1991. Mexico also offers some intriguing possibilities in terms of production facilities for U.S. based firms. In 1994 alone Mexican car and truck production totaled 1.173 million units, up 8.6 percent from 1993. The Mexican government had along term plan in terms of automobile production in Mexico, and it is in a phase now that favors foreign investors and exportation out of the Mexican market. Check the figure bellow to see how the plan has progressed so far.

Down Syndrome :: Biology Chromosome Disorders

Karyotype is the characteristic chromosome complements of a eukaryotic species and they are arranged in homologous pairs. There are many abnormal chromosomes and some of them are Turner syndrome, Klinifelter syndrome, Edwards’s syndrome, Down syndrome and Patau syndrome. The abnormal chromosome that I was given was called Down Syndrome or trisomy 21. We could recognize this disease by looking at the Karyotype because a normal karyotype has two- 21 chromosome but in Down syndrome there are three- 21 chromosomes. My Karyotype chart represented a male. I realized this because there was one X chromosome and other one was Y chromosome. The disease assigned to me was caused by sex chromosomes which affects both males and females. The Down syndrome could be notified before a child was born. The symptoms of this disease vary more that 50 characteristics. The general characteristics were the growth of the child which would be slower than the average, weak muscles, excess fat and skin, short arms and short legs. The facial features of the people with down syndrome was also different from the average, such as small and low set ears, irregular shaped mouth and tongue, tissue built-up on the iris and irregular or crooked teeth, which was produced late. It would be fairly easy to understand the cause of Down syndrome (DS). Most people have 23 pairs of chromosomes (total of 46), but a baby with Down syndrome had 47 chromosomes. One of the two parents might be a balanced carrier of translocation. This would happen when translocation of 21 chromosomes attached to another chromosome. There is no specific treatment for Down syndrome at present, but the technology will find a solution soon, for such diseases. There is a treatment which is called Down syndrome treatment and it focuses on controlling the symptoms and the characteristics of the syndrome.

Effects of Restricting the Type and Amount of Video Game Use by Childre

Effects of Restricting the Type and Amount of Video Game Use by Children Popularity of Video Games Playing video games has become almost as popular as watching television. The vast majority of school children play video games; they are part of the daily routine of 65% of American households. Video games account for 30% of the US toy market and the annual earnings from video games approaches nine billion dollars, which is more than the gross sales from box office tickets for movies. This amount is 10 times the amount spent on production of children’s educational television programming (Walsh, 1999). Despite the popularity of video games, parents and teachers alike question whether or not this activity has any educational value. Moreover, as the quality and realism of video games improve with advances in technology, it is likely that children's interest in video games is going to increase, not decrease. For example, interactive video games, multimedia video games, and virtual reality video games are already on the market. It has been, and will continue to be difficult f or parents to keep their children from playing this new generation of video games. The purpose of this review is to explore the issue of whether or not parents should restrict the type of video game their children play and the amount of time their children play video games. Positive and Negative Aspects Clearly, there are several negative aspects to playing video games. Parents have little control over the types of games their children choose to play. Perhaps the only meaningful questions we can ask are "should they control the type of video game their child uses, e.g., traditional versus those with â€Å"proven therapeutic value?" (Parente, 1997). Sh... ...gy 2.1: 69-74. Parente, A. (1997). Does video games improve attention-concentration and hand-eye coordination: Short report? Cognitive Technology 2.2: 41-43. Phillips, C.A., Rolls, S., Rouse, A., & Griffiths, M.D. (1995). Home video game playing in schoolchildren: A study of incidence and patterns of play. Journal of Adolescence 18.6: 687-691. Scientific Research. Retrieved 16 September 2001. http://www.playattention.com/studies.htm. The Effects of Video Games on How Children Learn. Retrieved 5 June 2001. http://pluto.palomar.edu/renteria030/essay2.htm. Twum, M. (1994). Maximizing generalization of cognition and memory after traumatic brain injury. NeuroRehabilitation, 4.3: 157-167. Video Games: Harmfully Addictive or A Unique Educational Environment? Retrieved 5 June 2001. http://www.eeng.dcu.ie/~tcs/Articles/VideoGamesInterview.html.

Mines Wellness Hotel

Background Mines Wellness Hotel is a delightful 168-room resort hotel with a tropical design overlooking a scenic 150-acre lake. Strategically located within a 1,000-acre mixed development just 15 minutes south of Kuala Lumpur's City Centre, Mines Wellness Hotel are just a 30-minute drive from KLIA (Kuala Lumpur International Airport), LCCT (Low Cost Carrier Terminal), Putrajaya, and Cyberjaya. Mines Wellness Hotel provides the perfect escape from the hectic city life. In the hotel, all rooms and suites have balconies, mostly with a fabulous view of the lake.The rooms are categorized into seven types; Standard,Superior, Deluxe, Helicornia, Chalet, One bedroom suites and Royal suite. To concern the health of their guest, Mines Wellness Hotel is a fully non-smoking hotel, therefore the ambience, culture and service at Mines Wellness Hotel capture the total well-being experience for the revival of mind, body and soul. The hotel’s services are designed to bring their customers bod y back to its natural state of wellness. To complement the services, they also have Qi Gong and Yoga for those who want to practice the art of knowing the body and healing it from its own.Other than that, Mines Wellness Hotel have a â€Å"beach in the city† it is also the perfect choice not only for health retreat or weekend getaway, but also for garden weddings, beach barbeques, family days, team building events and other leisure or corporate activities. With an array of water sports activities such as parasailing, water skiing, and wake-boarding, one will be spoilt for choice. If the guest is not into adrenaline-pumping activities, they can also have a quiet time at the man-made beach.Mines Wellness Hotel has a total of two ballrooms and five multi-purpose function rooms. The ballrooms are named after historical figures, boasting a seating capacity of 150 to 280 people respectively. The five smaller rooms are ideal for meetings, conferences and seminars with a business cent er providing secretarial services for the guests’ convenience. Situated adjacent to the Malaysian International Exhibition and Convention Centre (MIECC), and located just 30 minute Kuala Lumpur City Center, Mines Wellness Hotel is the ideal hotel for patrons and exhibitors alike.The hotel continued to record high traffic of leisure markets from neighboring Asian countries such as, China, Taiwan, Indonesia and Singapore as well as the Middle East. The Mines Wellness Hotel has taken on the responsibility of preserving mother earth by going green through the formation of Mines Green Circle. It is a special green environment unit formed to ensure the sustainability of nature through initiating and retaining environmental consciousness among its entire staff, guests and the masses. The hotel started their green practices since 2008.Mines Wellness Hotel was recently awarded the ASEAN Green Award 2012, this was their second time awarded since 2010. The award recognizes players in th e hotel industry whose operations are based on the environmental policy and hotel operation activities, utilization of green products, cooperation with local community and organizations, human resources development, solid waste management, energy efficiency, water efficiency, water quality management, noise pollution control, waste water treatment and management, and toxic and chemical substance disposal management..The ASEAN Green Award Hotel Standard is valid throughout the years 2012 to 2014. In addition, Mines Wellness Hotel also won the Best Landscape under the hotel/resort/tourist complex category for the year 2011 by Majlis Perbandaran Subang Jaya (MPSJ).