Relevance of public sector enterprise Essay Example

Relevance of public sector enterprise Essay Example Relevance of public sector enterprise Essay Relevance of public sector enterprise Essay The Five Year Plan and other official documents also use the term Public Sector in the wider sense to cover all governmental activities, including public industrial and commercial enterprises. The theory that if the government is kept out of the business, it would automatically provide the community with all it desired, without any plan or conscious planning opened the door to the devil has long ago been exploded . Government intervention in the economic system for social and economic reasons is now clearly accepted and has come to stay. Governments all over the world, particularly in developing countries, have gone far beyond the indicative planning to price, wage, and numerous other controls and to state entrepreneurship. Radical transformation from a purely agrarian economy to en of the important industrialized nations of the world, and demolishing of a regimented structured society to one based on social justice, would not have been possible without the emphasis which has been laid on the growth and development of Pu bill Enterprises. Public enterprises were created in most countries to accelerate economic and social development. Yet, increasing evidence indicates that most public enterprises either do not contribute strongly to development or perform their public service functions ineffectively or inefficiently. Policy makers engage in intuition debates over whether or not state-owned corporations contribute to economic and social development, why so many have failed to deliver effectively the services for which they were created, and how their management can be improved. As state earlier, the business units owned, managed and controlled by the central, state or local government are termed as public sector enterprises or public enterprises. These are also known as public sector undertakings. A public sector enterprise may be defined as any commercial or industrial undertaking owned and managed by the government with a view to maximize social welfare and uphold the public interest. Public enterprises consist of nationalized private sector enterprises, such as, banks, Life Insurance Corporation of India and the new enterprises set up by the government such as Hindustan Machine Tools (HIM), Gas Authority of India (GAIL), State Trading Corporation (SST) etc. Government Ownership and Management: The public enterprises are owned and managed by the central or state government, or by the local authority. The government may either wholly own the public enterprises or the ownership may partly be with the government and partly with the private industrialists and the public. Financed from Government Funds: The public enterprises get their capital from Government Funds and the government has to make provision for their capital in its budget. Public Welfare: Public enterprises are not guided by profit motive. Their major focus is on providing the service or commodity at reasonable prices. Public Utility Services: Public sector enterprises concentrate on providing public utility services like transport, electricity, telecommunication etc. Public Accountability: Public enterprises are governed by public policies formulated by the government ND are accountable to the legislature. Excessive Formalities: The government rules and regulations force the public enterprises to observe excessive formalities in their operations. This makes the task of management very sensitive and cumbersome. Difference between Private and Public Sector Enterprises By private sector, we mean, economic and social activities undertaken privately by a single individual or group of individuals. They prefer to do business in private sector basically to earn profit. On the other hand public sector refers to economic and social activities undertaken by public authorities. The enterprises in public sector are set up with the main aim of protecting public interest. Profit earning comes next. Besides the difference in the objective, the enterprises in both these sectors also differ in many other aspects. Forms of Organization of Public Enterprises There are three different forms of organization used for the public sector enterprises in India. These are 1. Departmental Undertaking; 2. Statutory (or Public) Corporation 3. Government Company. Departmental Undertaking form of organization is primarily used for provision of essential services such as railways, postal services, broadcasting etc. Such organizations function under the overall control of a ministry of the government and are financed and controlled in the same way as any other government department. This form is considered suitable for activities where the government desires to have control over them in view of the public interest. Statutory Corporation (or public corporation) refers to a corporate body created by the Parliament or State Legislature by a special Act, which define its powers, functions and pattern of management. Statutory corporation is also known as public corporation. Its capital is wholly provided y the government. Importance of Public Sector Enterprises There are only some selected areas in which the government establishes its enterprises for a balanced development of the economy and promote public welfare. There are several areas where huge investment of capital is necessary but the margin of profit is either meager or it can be obtained only after a long period as in case of generation and supply of electricity, machine building construction of dams, etc. The private businessmen hesitate to establish their enterprises in these areas but they cannot be neglected in public interest. As such these enterprises are established and run by the government. Similarly the public enterprises also help in balanced regional development by promoting industries in every part of the country. Industrial progress is of utmost importance for the development of the country and for this, it is necessary that some basic industries like oil, coal, gas, iron, steel, production of heavy electrical goods, etc. , are to be fully developed. Public enterprises give impetus to the development of these basic industries and also help in the development of the private sector with their products and services. There are some industries which require heavy capital investment on account of technical reasons. Electricity, power, production of gas, heavy machinery tools, production of telephone etc. Are such industries. The development of public enterprises also prevents concentration of economic power in the hands of an individual, or a group of individuals. Not only that, the public enterprises can help in red icing inequalities with the help of various policies like utilizing the earned profits in public welfare activities and by selling raw material to the small scale industries at lower r icers. It is also necessary for the economic progress of a country that industries which can decrease imports and increase exports are only promoted. Public enterprises also ensure promotion of such industries. The public enterprises ensure necessary resources are made available to all at fair prices. The security of the country is supreme. There should be no compromise in ensuring this. The production of fighter airplanes, arms and ammunition etc, connected with the security of the country is put under the domain of Public Enterprises for this purpose. Thus, public welfare planned economic development of the country, regional balance, import substitution and checking concentration Of economic powers are the major goals achieved through public enterprises. Role and Rationale of Public Enterprises The public sector has been playing a vital role in the economic development of the country. In fact the public sector has come to occupy such an important place in our economy that on its effective performance depends largely the achievement of the countrys economic and social goals. Public sector is considered a powerful engine of economic development and an important instrument of self-reliance. The main contributions of public enterprises to the countrys economy may be described as follows: 1. Filling of gaps At the time of independence, there existed serious gaps in the industrial structure of the country, particularly in the field of heavy industries. Basic and key industries require huge capital investment, involve considerable risk and suffer from long gestation periods. Private sector concerns do not come forward to establish such industries. Public sector has helped to fill up these gaps. The basic infrastructure required for rapid industrialization has been lilt up, through the production of strategic capital goods. The public sector has considerably widened the industrial base of the country and speeded up the pace of industrialization. 2. Employment Public sector has created millions of jobs to tackle the unemployment problem in the country. Public sector accounts for about two-third of the total employment in the organized industrial sector in India. By taking over many sick units, the public sector has protected the employment of millions. Public sector has also contributed a lot towards the improvement of working and vying conditions Of workers by serving as a model employer. . Balanced regional development Private industries tend to concentrate in certain regions while other regions remain backward. Public sector undertakings have located their plants in backward and untraced parts of the country. These areas lacked basic industrial and civic facilities like electricity, water supply, township and manpower. Public enterprises have developed these facilities thereby bringing about complete transformation in the social-economic life of the people in these regions. Steel plants of Bilabial, Rosella and Durra; earthlier factory at Sinned, machine tool plants in Restaurants, precision instruments plants in Kraal and Restaurants, etc. , are a few examples of the development of backward regions by the public sector. 4. Optimum utilization of resources Public enterprises make better utilization of scarce resources of the country. They are big in size and able to enjoy the benefits of large scale operations. They help to eliminate wasteful completion and ensure full use of installed capacity. Optimum utilization of resources results in better and cheaper production. 5. Manipulation of surplus The profits earned by public enterprises are reinvested for expansion and diversification. Moreover, public sector concerns like banks and financial institutions mobiles scattered public savings thereby helping the process of capital formation in the country. Public enterprises earn considerable foreign exchange through exports. 6. Self reliance Public enterprises have reduced considerably the need for imports by producing new and better products within the country. These enterprises are also earning considerable amount of foreign exchange through exports. 7. Socialistic pattern of society Public sector is an instrument for realizing social objectives. Public enterprises help to check concentration of wealth and private monopolies. These enterprises can serve as powerful means of economic and social change. 8. Public welfare Public enterprises help in the establishment of a welfare state in the country. These enterprises us apply essential commodities at cheaper rates. A proper balance between demand and supply is created to protect consumers against exploitation by profit hungry businessmen. Public enterprises also protect and promote the interests Of workers. Objectives . Economic development Public enterprises were set up to accelerate the rate of economic growth in a planned manner. These enterprises have created a sound industrial base for rapid industrialization of the country. They are expected to provide infrastructure facilities for promoting balanced and diversified economic structure of development. 2. Self-reliance Another aim Of public enterprises is to promote self-reliance in strategic sectors of the national economy. For this purpose, public enterprises have been set up in transportation, communication, energy, petrol-chemicals, and there key and basic industries. . Development of backward Areas Several public enterprises were established in backward areas to reduce regional imbalances in development. Balanced development of different parts of the country is necessary for social as well as strategic reasons. 4. Employment generation Unemployment has become a serious problem in India. Public enterprises seek to offer gainful employment to millions. In order to protect jobs, several sick units in the private sector have been nationalized. 5. Economic surplus Public enterprises seek to generate and mobiles surplus for reinvestment. These enterprises earn money and mobiles public savings for industrial development. 6. Egalitarian society An important objective of public enterprises is to prevent concentration of economic power and growth of private monopolies. Public sector helps the Government to enforce social control on trade and industry for ensuring equitable distribution of goods and services. Public enterprises protect and promote small scale industries. 7. Consumer welfare public enterprises seek to protect consumers from exploitation and profiteering by ensuring supply of essential commodities at cheaper prices. They aim at stabilizing prices. 8. Public utilities Private sector is guided by profit motive. Therefore, it is reluctant to invest money in public utility services like water supply, gas, electricity, public transport. Therefore, the Government has to assume responsibility for providing such services. 9. Defense Government has to set up public enterprises for production of defense equipment. Supply of such equipment cannot be entrusted for private sector due to the need for utmost secrecy. 10. Labor welfare Public enterprises serve as model employers. They ensure welfare and social security of employees. Many public enterprises have developed townships, schools, college and hospitals for their workers. Advantages Public sector has come to assume the commanding heights of the economy. It was monopoly in railways, communication and air transport; virtual monopoly in coal mining, power generation and petroleum industry; a predominant share in banking, insurance, shipping, steel and other metals; machine tools, fertilizers, insecticides, and petrochemicals; and share in light engineering industries like drugs; textiles industries; consumer goods form break of electronic new industries, it has also been taking over old opens which became sick. Public Sector has played a significant role in the industrialization Of the country. By establishing the basic and heavy industries and providing the infrastructure, it has enabled growth of innumerable light industries and also taking over old ones which became sick. Public sector has played a significant role in the industrialization of the provid ed the virtual inputs of ushering the Green Revolution. It has also played a pioneering role in dispersing industries in various regions of the entry particularly in the backward area. It is generally recognized as a model employer providing fair wages, good working conditions and amenities, and recognizing the rights of the workers. As a result, industrial relations except in certain units and for some time past are better and the maydays lost are much less than n the private sector. 1. Balanced growth By establishing public sector enterprises, a country can develop its economy in all regions. Thus there is a balanced growth. These enterprises can be developed on economic, social and regional basis.

Patient Controlled Analgesia Essay Example | Topics and Well Written Essays - 2500 words

Patient Controlled Analgesia - Essay Example 1989). This was first introduced in 1970 into obstetric practise where the patient simply controlled the administration of i.v. pethidine by operation of a spring loaded clamp on an infusion set! In a way, it mimics the use of the PCA 50:50 nitrous oxide/oxygen gas mixture (Entonox). Patient Controlled Analgesia refers to a particular type of breakthrough dosing used when a predetermined parenteral drug dose is injected following the push of a button. In reality not all PCA breakthrough doses are controlled or administered by patients, who may be physically or mentally impaired. Clinicians or families may administer the breakthrough dose in such cases, which is still often (erroneously) called the PCA dose. Thus, in practice parenteral breakthrough doses, when programmed by a pump are often referred to as PCA doses, regardless of who administers the dose. In a general sense, patient-controlled analgesia refers to a process where patients can determine when and how much medication the y receive, regardless of analgesic technique. On the other hand, the term is more commonly used to describe a method of pain relief which uses disposable or electronic infusion devices and allows patients to self-administer analgesic drugs, usually intravenous (i.v.) opioids, as required. Patient-controlled analgesia produces a modest improvement in pain relief over a 24 hour period compared with conventional analgesia. It is preferred by patients, and is not associated with additional side effects. For many patients, mainly those having major abdominal surgery, PCA offers the greatest pain relief and the most flexibility. A PCA device consists of a pump, a reservoir to hold the drug and a handset with a button that administers a dose of drug when activated by the patient. Patient receives pain medication by pressing a button permitting the patient to take control of the pain. This eases the anxious waiting for pain relief and the peaks of pain (Macintyre PE, Runciman WB, Webb RK. 1 990). Patient controlled analgesia is widely used for postoperative pain relief in both children and adults. Unfortunately, postoperative pain control is often the last concern discussed with patients even though it can become the major concern after the operation is performed. Most patients are more worried concerning the potential surgery and anaesthetic complications prior to surgery, than they are with pain control after surgery. Therefore, patients are often overshadowed by the patient's anxiety regarding the procedure Postoperative pain management actually starts preoperatively. The anaesthesiologists and surgeon will decide on a plan prior to the surgery. A major deciding factor with regard to choosing an appropriate plan will depend on whether the patient is to be discharged the same day (day surgery) or will be admitted after surgery. With right preoperative teaching and encouragement, children as young as 6 to 7 years of age can independently use the PCA pump to provide good post operative pain relief (Kluger and Owen H. 1990). Children between the ages of 4 and 6, though, generally require encouragement from the parents and nursing staff to push the button before anticipated painful movements or

Online Business Technologies Term Paper Example | Topics and Well Written Essays - 4000 words

Online Business Technologies - Term Paper Example Successful organizations have been at the forefront of implementing e-commerce to integrate business processes and enhance work operations within the organization. The changes heralded by ICT are likely to accelerate in the future and herald fresh technological developments within the digital economy that are likely to generate fresh fundamental approaches to e-business of economy, government, and society accompanied by social and political implications (Stephen 2005, p.2). The term e-commerce is employed to describe online transactions incorporating the buying and selling of goods and services over the internet. The advantages of e-business encompass: yielding enhanced precision, quality and time demanded to update and delivering information on products or services; awarding client s the possibility of accessing the catalogs and prices at all time. E-business allows adoption of a fast and immediate way of conducting transactions and allows the electronic delivery of products and enh anced market, competitor intelligence (Phan 2003, p.581). Indeed, e-business has led to an expansion of customer base and rise within export opportunities. E-business pursues utilizing the Internet and linked technologies to integrate and redesign the organization’s internal activities, processes, and external relations, and generate fresh ways of working that are dramatically different from, and frequently superior to what was possible previously. E-business may encompass aspects such as electronic invoicing, electronic supply chain, and electronic marketing and promoting (Lawson 2001, p.377). Some of the conditions critical for e-business entail aspects such as configuration of all processes with the internet; significant revenue contribution from the internet; 24/7electronic infrastructure; and, profit and loss focus. E-business refers to the term employed to describe the mode of utilizing the internet to operate a business. E-commerce encapsulates the ordering, purchasing , slang, and paying for products and services by utilizing the internet. E-business only mirrors a fraction of the global business and can be highlighted as a leading sector that avail entrepreneurs with a suitable platform for entering the market (AMit and Zott 2001, p.493). E-business represents the strategic employment of internet tools and technologies with the aim of enriching all aspects of a business such as marketing, sales, or back-end activities. Background The internet has over time become an increasingly critical part of people’s lives. Indeed, e-business is increasingly permeating the mainstream business culture and becoming a medium connecting consumers and enterprises. Despite the increased growth of e-business, the majority of the industries are yet to realize the full potential of the internet, and there are numerous opportunities that stand to be exploited (Stephen 2005, p.3). This should be undertaken in full knowledge of the fact that technology takes time to thrive and become broadly available. As such, society requires time to adjust to allow all stakeholders to abandon their previous ways of undertaking things, and start utilizing the new technology in such a manner that it actually generates value. Rapid development in infrastructure and services has been widely witnessed in both private and private sectors organizations. The growth that the ICT sector has witnessed has yielded to IT representing one of the biggest capital expenditure by companies/businesses. A significant part of government initiatives has frequently been targeted at increasing the investments within ICT.

An Effect of Unemployment to rape Essay Example | Topics and Well Written Essays - 1500 words

An Effect of Unemployment to rape - Essay Example Alternative Hypothesis: There is a statistically significant relationship between the rates of rape and unemployment Research Design and Sample The aim of this study is to test for a significant relationship between the rate of rape and rate of unemployment. To do this rape and unemployment data from each of the 50 states will be analyzed for the year 2010. Data Collection The independent variable for this study was the unemployment rate. This is a percentage value calculated from the division of the number of unemployed people by the labor force. Someone is considered to be unemployed if they are above 16 years of age who had no employment during the period but was available and desired to work. In contrast an individual is employed if they are over 16 and worked for at least one hour during the reference period. In general the reference period is one week. The labor force is the total number of people considered to be unemployed or employed, For this study statistics on the unemplo yment and employment levels for each of the 50 states were analyzed for the 2010 period. Information was gathered from the Business First database (available at: http://www.bizjournals.com/buffalo/datacenter/state-employment-2010.html). The database gave the average number of people employed and unemployed for the year 2010; this was derived from information collected by the Bureau of Labor Statistics how were the data collected? be more specific here and as a consequence represented the mean value from 12 months of data. As a consequence, the unemployment rate could be calculated by adding the employment and unemployment levels together (to provide the labor force value) and then dividing the unemployment level by the labor force to give a percentage of the labor force which was unemployed. This value is the unemployment rate. The unemployment rate was determined independently for each of the 50 states. The dependent variable for this study was forcible rape per 100,000 population. For this, the FBI crime statistics from 2010 were used (available at: http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2010/crime-in-the-u.s.-2010/tables/10tbl05.xls). These statistics considered many different types of crime including forcible rape in each of the states and included the number of reported incidences of rape as well as the estimated total of rape cases. The estimated total number of rapes was used for this study. Aggravated rape is defined as is the forcible sexual penetration of a woman as well as assault with this intent or attempted but not successful rape. Each incident of either rape or attempted rape was recorded as an offense within the database. Statutory rape was not included in the database and as a consequence was not part of this study. Analysis As there is no experimental manipulation of either variable, cause and effect cannot be directly tested, consequently, the analysis needs to test for correlation. In order to do this, a statistical test for correlation needs to be undertaken. To test whether there is a significant relationship between rape and unemployment rate a Pearson Product-Moment Correlation will be conducted. This test looks for a linear relationship between two variables and can describe a positive relationship, negative relationship or absence of relationship. The Pearson correlation coefficient is known as r and is a measure of how closely the data points are to the line of best fit that is described by the Pearson Product-Moment Correlation. A value of below zero indicates a negative correlation between the two variables (in this case rape and unemployment), a value above zero indicates a positive relationship, and a value close to zero indicates an absence of relati

General Mills Case Essay Example for Free

General Mills Case Essay General Mills is a major manufacturer and marketer of consumer foods in partnership with Pepsi Co. and Nestle. General Mills’ revenue is about 7.5 dollars with a market capitalization numbering to about 11 billion dollars. Its products are cereals, snacks, yogurt and many more and with this, they have to decide about an acquisition of another business which complements their products for them to be able to create more shares of stocks for the personal growth of the company. The company which they want to acquire is Pillsbury which is owned by Diageo PLC. Diageo PLC is considered as one of the leading consumer goods companies in the world. Owned by Diageo, Pillsbury operates as an independent company which produces refrigerated dough and baked goods which is related with the business of General Mills. Pillsbury‘s earning on year 2000 is $6.1 billion with reasonable debt structure. This transaction requires General Mill to issue 141million shares of its common stock to Diageo, making him own 33% of General Mill’s outstanding stocks. It also included an assumption of $5.142 billion of Pillsbury debt by Diageo. The first two statements when added would total to the asking price of Diageo which is $10.5 billion that is $500 million larger than the proposed payment of Gen. Mills totaling to $10 billion. Another is a contingent payment by Diageo of up to $642 million to General Mills upon the first anniversary of the transaction depending on General Mill’s 20days share price at that time. If the transaction would be completed, General Mills would then own 100% of the Pillsbury’s stock as it would already be owned by General Mills. In relation with the terms set in the transaction, General Mills didn’t like to issue one third of its shares to Diageo that is actually equal to 33%, which is what Diageo wanted. Another is that General Mills didn’t want to lose value it its investment grade bond rating. Positive results if transaction is approved: 1. General Mills will achieve growth because sales that will be made by Pillsbury will now be added to the sales made by General Mills and that goes with an increase in revenue for General Mills. This result will then benefit GM’s share-holders. 2. The two companies’ products are related and thus there would be easier management and operation since they could combine materials and resources and be able to choose which are the better suppliers bases on what the two companies currently have. Upon acquisition, they joint companies could now remove and retain what is better for them to have for better production. In relation to this, they would then be able to save costs maybe from production or others like taxes. 3. Merger of brand names could increase the value of the company with regards to their popularity. 4. According to Porter, there is rivalry in industries and as a Hotel and Restaurant Management graduate, I could say that the competition within the food industry is very intense because of low barriers to entry. So, the joining of two big companies is essential for them to be able to create stronger barriers to diminish competitors and therefore earn more than usual. EXHIBIT 3 Price of stocks on transaction date, July 14, 2000 is $36.31 Total stocks: 141million * 3 = 423million Total price of stocks as of Nov. 27, 2000 423million * $36.31 = $15.359 billion The latest price of stocks of General Mills is equal to $40.49 as of Nov. 27, 2000 Remaining stocks after transaction: 423-141 = 282million Total price of remaining stocks after transaction: 282million * $40.49 = $11.418 billion *This would show that General Mills did not lose so much since there was increase in the price of their stock that means that it would be receive payment from Diageo amounting to $642 million which it could use to buy back some of its stocks. Possible negative Effects of Acquisition: 1. Possible increase in their debt since according to exhibit 5, General Mills have a total debt to equity ratio of 12.048 with a long term debt to equity ratio of 6.179. 2. Possible loss of employment because of cost saving and duplication in the position of employees for the joint company. In conclusion, I think that they should agree with the transaction because of the more positive result it will bring compared to the negative effects that it could give. The losses they will have will surely have a great return after they have polished everything in their marketing, production, management operations and in regards with whole new company.

The History of Electromagnetic Suspension System

The History of Electromagnetic Suspension System As the knees are the important part of the human body because of which he can walk, run, sit and jump properly, the suspension system is a knee of a vehicle, with which the vehicle can give us a comfortable ride. The automobile frame and body are mounted on the front and rear axle not directly but through some form of springs and shock absorbers. This is done to damp to road shocks transmitted to the frame by the wheels as they roll over the road. All these parts which perform this function are together called as a suspension system. Thus the suspension system includes springs, shock absorber and there mountings. The suspension system of a motor vehicle divided into the rear end suspension front end suspension. 1.1 Need of suspension system: To avoid the road shocks which are pass on to the vehicle frame. To preserve the steadiness of a car in pitching or rolling, when in motion. To safeguard the occupant from road shocks. To provide good road holding while driving, cornering and braking. To maintain proper steering geometry. 1.2 Types of suspension systems: The following are the suspension systems which rare used in the modern vehicles, Dry friction or Leaf spring Coil spring Air bag Rubber spring Electromagnetic suspension system 1.3 History of suspension system: Rolls Royce (1913) illustrates that how the different situations was in the early years where rear dampers stopped to use. Dry snubbers were used in between 1910-1925. However, the period 1925-1980 was very extensive by simple hydraulics, primarily simply constant force blow off, then proportional characteristics, then adjustable, leading to mature product. In the period of 1980 to 1985, there was an enthusiasm about the possibilities for the different types of active suspension, and they had the ability to get rid of the ordinary dampers. Then after some period in 1985, the fast auto-adjusting dampers, turn out to be more and more obvious, because they found a good deal profit of active suspension much more cheaply, and from that period the damper unexpectedly became an interesting, developing component again (Dixon John, 2010). In 1966 for high-speed transportation Danby and Powell introduced an EDS system using super conducting magnets with a null flux suspension. After some period some more designs proposed using continues sheet guide ways. Then some from U.S., Japan, Germany, UK and Canada have developed further innovations (such as ladder type guide way for increased lift efficiency), but there are still a number of technical problems that needed resolution. (T. Thompson, Richard D. Thornton and Anthony Kondoleon, 2010) 1.4 Current Details Of Electromagnetic Suspension (Maglev): There are three primary types of Maglev technologies: superconducting magnets ( electrodynamic suspension) feedback controlled electromagnets ( electromagnetic suspension) A new but very cheaper permanent magnet system Inductrack. The several approaches and designs have been produced by Japan and Germany. These two countries are very active in maglev research. The design used for trains in which the train levitate by the repulsive force of the same poles of the magnets. A linear motor is used to propel the train or on the locomotive or both. In this system massive electrical induction coils produce the magnetic field and the need of this magnetic field which is placed along the track is to propel the train, leading some to speculate that the cost of constructing such tracks would be enormous. ( Heller Arnie 2010). Earnshaws theorem states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges. As Earnshaws theorem says Magnetic bearings are unstable; the conventional maglev systems stabilized with the help of the electromagnets which have electronic stabilization. In actual to levitate the train that is to keep the train up in the air with the help of an magnetic field it needs very strong magnetic field which only can generate by a large electromagnet but large electromagnet is also a big issue for the design, so instead of using the large magnets, superconductor for an capable electromagnet. Inductrack is a cheap in cost compare to other systems. The system relies on the current induced in the passive electromagnetic array generated by permanent magnets, so that it provides the better load carrying capacity related to the speed. In the model, the permanent magnets are placed on both sides of the model; the function of these magnets is to provide horizontal lift and vertical stability. There is collection of wire loops in the track which is also called as array. There is no power supply in magnets and the model, apart from the speed of the model. The basic concept behind this system is to store the power by developing the inductrack as a motor and flywheel bearing. With only slight design changes, the bearings were unrolled into a linear track. William Post is the father of such a great innovation like inductrack. He had done this experiment at Lawrence Livermore National Laboratory. (Heller Arnie 2010). Chapter 2 LITERATURE REVIEW 2.1 Principle of Suspension System: The suspension system of an automobile has input force and output as shown in above fig. Fig: 2.1 (Dr. Erping Zhou, 2010) where, M1 is the body mass of the vehicle M2 is the mass of the suspension system K1 is the spring constant for suspension system K is the constant for the tyre (spring). C is the damper constant Y is the input force form the road to the suspension system. Y1 is the input force from suspension system to the body of vehicle. X is the output displacement. So the mathematical diagram of the vehicle is given as: M2 K1(Y1- X)+ C. d(Y1- X)/ dt K2(Y-Y1) Therefore now we can have, K1(Y1- X)+ C. d(Y1- X)/ dt = M1 d2x/dt2(1) And K1(Y1- X)+ C. d(Y1- X)/ dt K2(Y-Y1) = M2 d2Y1/dt2(2) By lapalce theorem, consider d/ dt = S K1(Y1- X)+ C. S(Y1- X) = M1 S2X..(3) K1(Y1- X)+ C. S(Y1- X) K2(Y-Y1) = M2 S2Y1(4) So by solving equation (3) we get the input, K1Y1 K1X + CSY1 CSX = M1S2X X/Y1 = K1 + CS/ (M1S2 + CS + K1) Y1 (INPUT) = X (M1S2 + CS + K1) / K1 + CS (Dr. Erping Zhou, 2010) 2.2 Basic Concept: Take a cylindrical hollow shock absorber frame placing two magnets inside it. In this cylinder the arrangement of the magnets is in such a way, place one magnet at the top of the cylinder with any polarity let us consider south polarity on down side. Then place another magnet at the bottom of the cylinder having south polarity upside so that they can be parallel each other. Then due to the same polarity of both the magnets the repulsive force generates which gives the movement to the shaft to avoid any unwanted shocks and the fixed hydraulic damper absorbs the vibrations and instability. 2.3 Theory of Vibration: Any motion that repeats itself after an interval of time is called vibration or oscillation. The best examples for vibration are pendulum and a plucked string. The theory of vibration explains the study of oscillatory motions. Free vibration without damping To begin with the study of the mass-spring-damper, lets consider the damping is insignificant and the mass is free from any type of force that is called free vibration. Where, k is the constant of stiffness x is the length of stretched spring m is the mass of body So the force is given by, Fs = kx By Newtons second law of motion the generated force is proportional to the acceleration of the mass E F = ma = m.d2x / dt2 Then the sum of the forces on the mass is equals to zero: ma + kx = 0 If the system starts to vibrate by stretching the spring by the distance of A, we get the following equation. x(t) = A cos(2à Ã¢â€š ¬ fnt) The above explanation state that the system oscillates with the simple harmonic motion with an amplitude A , frequency fn. The number fn is called as the undamped frequency which is defined as: fn = To simplify the equation the angular frequency à Ã¢â‚¬ ° (à Ã¢â‚¬ ° = 2à Ã¢â€š ¬f) which has a unit radians per second. If the mass is heavy and inflexibility of the system is known, then the frequency concludes when the force is applied to the system, it will vibrate. When the system once disturbed it vibrates because it has one or more frequencies. The above formula shows the complexity in the real complex designs. (Tustin Wayne 2010) The causes of vibration in the system (conservation of energy) Conservation of energy explains the vibrational motion. In the above example the value of the spring is x and therefore it has stored some potential energy (kx2). Once the spring became free it tries to gain its original shape which has minimum potential energy and in the process accelerates the mass. As the spring reached at its original state that is in unstreched position all the potential energy then converted in to the kinetic energy (mv2). The system then starts to deaccelerate because of the compression of the spring and in this process it transfers kinetic energy into original potential energy. Thus oscillation of the spring transfers the kinetic energy into potential energy. In the above given simple system the mass remains oscillate at the same magnitude, but this doesnt happened in the real system because of the damper which disperse the energy and therefore the system finally bringing it to rest. (Tustin Wayne 2010) Free vibration with damping Now in this system a viscous damper is added to the system which generates an opposive force against the motion of the body which is relative to the velocity of the mass. Where c is the proportionality constant and has units of Force over velocity (N s/m). x m k c Fig: 2.3 (Tustin Wayne 2010) Fd = cv = -c. dx/dt By summing the forces on the mass we get the following ordinary differential equation: ma + cv + kx = 0 The result of the above equation relies on the amount of damping. For the small damping effect the system vibrates but after some time it slows down and finally stops vibrating. This case is called underdamping this case is of most interest in vibration analysis. If the damping effect increases until the last point of the oscillation of the system, the system then goes in to the critical damping. Cc = 2 Is the final critical damping point calue for the mass spring damper model. A damping ration is used to differentiate the amount of damping in a system. The differentiation of the damping is defined as to get a critical point the actual damping divided by the amount of damping. The damping ratio (ÃŽÂ ¶) given as: ÃŽÂ ¶ = c / The values of damping factors for airplane fuselage, engine crankshaft are less than 0.05 and for an automotive suspensions the range of 0.2-0.3. The key for the underdamped system for the mass spring damper model is : x(t) = Xe-ÃŽÂ ¶Ãƒ Ã¢â‚¬ °t cos ( à Ã¢â‚¬ ° = 2à Ã¢â€š ¬f The value of X, the initial magnitude, and à Ã¢â‚¬  , the phase shift, are determined by the amount the spring is stretched. (Tustin Wayne 2010) Analyzation of Damped and undamped natural frequencies The exponential term and the cosine function are the two main points which are noted from the solution. The meaning of exponential term is how quickly the system damps down. The damping effect is low when the damping ration is more. The cosine function explains the oscillations in the system, but the frequency of the oscillations is different from the undamped case. For this case the frequency is called damped natural frequency, fd, and there is a relation between the damped frequency and undamped frequency as follows: Fd = fn Generally, the undamped natural frequency is more than the damped natural frequency, but in realistic the difference between the damped and undamped frequencies is irrelevant because of the damping ratio which is moderately small. Therefore at the starting phase of natural frequency the damped and undamped description are frequently dropped.for example- when the damping ratio is 0.1, the damped natural frequency is only 1% less than the undamped. The two damping ratios 0.1 and 0.3 for the design of side shows how they affect the system and also they show how the system takes time to be stable. Also they show, most frequently what happened practically, is to calculate the free vibrations by doing some experiments after an impact on the system and then the system oscillates so by measuring the rate of oscillations conclude the natural frequency of the system as well as the ratio of damping with the help of rate of decay. Natural frequency and the damping ratio are the important factors in free vibrations but to understand and differentiate the behaviour of the system in different vibrations generated by force is also important. (Tustin Wayne 2010) 2.4 Principle of EMSS: The basic principle is to build up a contact less spring; the electromagnetic actuators can absorb the instability. The basics in electromagnetic suspension are the opposite polarity of the magnets facing each other absorbs all the bumps. The major difficulty is making the magnets physically powerful when running off a cars electrical system. 2.5 Halbach Arrays: Halbach cylinders are well-suited to magnetic levitation of gyroscope, motor and generator spindles. In these cylinders only permanent magnets and unpowered conductors are used to provide levitation. Rotational motion provides the energy of suspension entirely, efficiency is good, and there is no need of extremely low temperature suspension magnets or electronics. But there is a limit for the linear speed at the bearing race which must be above a meter per second to levitate. The inductrack maglev train system uses this principle as well, which avoids the problems inherent in actively supported systems. Halbach Cylinder: K = 1 K = 2 K = 3 K = 4A magnetized cylinder which is made up of a ferromagnetic material producing a magnetic field restricted completely inside the cylinder and doesnt produce any fields outside is called Halbach Cylinder. The Halbach Cylinders can also generate the magnetic field completely outside of the cylinder and then again it doesnt produce any fields inside the cylinder. Some magnetization distributions are shown below: Fig: 2.4 magnetization distributions( K. Halbach, J.C. Mallinson, Raich, H., Blà ¼mler 2010) The direction of magnetization within the ferromagnetic material is given by M = Mr { sin (kà Ã¢â‚¬ ¢)à °Ã‚ Ã‚ Ã¢â‚¬   cos (kà Ã¢â‚¬ ¢) à Ã¢â‚¬ ¢} Where, Mr is the magnetic remanance (T/m). +k is an internal magnetic field and -k is an external magnetic field. Preferably, the structures of these types of cylinders would be formed by an unlimited length cylinder of magnetic material which has the direction of magnetization constantly changing. These types of ideal designed cylinder produce the magnetic flux which is perfectly uniform and entirely confined to the bore of the cylinder. But in real case the infinite length of the cylinders cannot be used and in practice the limited length of the cylinders creates end effects which show the non-uniformities in the field within the bore. The complexity of developed a cylinder with a constantly changing magnetization also frequently directs to the design being broken into sections. ( K. Halbach, J.C. Mallinson, Raich, H., Blà ¼mler 2010) 2.6 Magnetic Material: Magnets have the basic property of attraction towards, or repulsion by other materials. A material with high permeability attracted strongly towards a magnet. There are two main examples of materials with very high permeability those are Iron and steel which powerfully attracted to magnets. Liquefied O2 is in fact slightly repelled by magnetic fields because it has very low permeability. People, gases and the vacuum of outer space has quantifiable permeability. The SI unit of magnetic field strength is the tesla, SI unit of total magnetic flux is the Weber. 1 Weber = 1 tesla following through 1 square meter, and is a very large amount of magnetic flux. Neodymium magnet: A neodymium magnet or NIB magnet which is also called as a rare earth magnet which is a good strength of attraction and repulsion, made of a combination of neodymium, iron and boron -Nd2Fe14B. Neodymium magnet on a bracket from a hard drive (PengCheng magnets Ltd., 2010) NIB magnets are comparatively very strong to their mass, they are mechanically brittle and the most powerful results to lose their magnetism at temperatures above 176 degrees fahrenheit or 80 degrees Celsius. In some cases they there strength is slightly more than samarium-cobalt like high-temperature grades will operate at up to 200 and even 230  °C. The neodymium magnet industry is constantly working to push the maximum energy product (strength) closer to the theoretical maximum of 64MGOe. A neodymium magnet has a capability to lift 1300 times more than its own mass. The small magnet have some remarkable properties it exhibits magnetic braking when moved near a non-magnetic metal due to induced eddy currents. (http://www.statemaster.com/encyclopedia/Neodymium-magnet, 2010) 2.7 Summery: The system mainly based on the repulsion of the two similar polarities of the two different magnets. The two damped and undamped systems gives the different vibration frequencies. The analyzation shows a major difference between damped and undamped system. The Halbach array stabilize the repulsive effect is to use field that move in space rather than just time. This effect can demonstrate with a rotating conductive disc and a permanent magnet, which will repel each other. A neodymium magnet or NIB is a powerfull magnet made up of a combination of neodymium, iron and boron- Nd2Fe14B is used in EMSS. Chapter 3 MAGLEV DESIGN 3.1 Electromagnetic Suspension System: (Concept) The design of the electromagnetic suspension system can be done with two types: 1) By using a Hydraulic Damper or 2) By using Linear Motor as a Damper. The concept is to design the magnetic suspension system on the front shock absorber of the motor bike to have a better performance with ease of handling and comfort ride. There are two cylinders installed on two separate arms of the front shock absorbing rods. The cylinder contains the pair of the cylindrical magnets having same pole facing each other to create the required repulsive force to have required levitation effect. The two cylindrical magnets having S (South Pole) on the outer surface concentric with the inner circle having N (North Pole) as shown in following figure:- 1) Working for the Hydraulic Damper: The two magnets are in a cylinder on a shaft, as seen in above figure comprise our required magnet for a motor bike front suspension system. In the fig. it shows the magnets are placed such as they are facing each other but with the same polarity, hence they repel each other according to the properties of magnets generate an air gap between them. The repulsive force restores displacement towards each other, and displacement away is restored by gravity. A hydraulic damper is fixed on the top of the cylinder and connected with the upper magnet with a shaft. The set of shocks used with magnets inside them that are used as the fork setup. In this cylinder the arrangement of the magnets is in such a way, place one magnet at the top of the cylinder with any polarity let us consider south polarity on down side. Then place another magnet at the bottom of the cylinder having south polarity upside so that they can be parallel each other. Then due to the same polarity of both the magnets the r epulsive force generates which gives the movement to the shaft to avoid any unwanted shocks and the fixed hydraulic damper absorbs the vibrations and instability. The shaft controlled the radial instability, the repelling force and the gravity force. The spring has a property to contract and extend but it cannot be stable, so the shaft is use to stabilize the spring. If the magnets are placed in two orthogonal axes, they repel each other but not in any one direction, so they are also instable. A thrust bearing can use to avoid the instability in which the magnets can be placed, and even if the instability take place the movable magnet will not fly has the advantage in that if instability does occur, the unstable magnet will not fly unpredictably away from the fixed magnet. The vibrations and the instability will be absorbed by the hydraulic damper. It is stated for completeness that the magnet has two poles North South. They will be attract each other if they are facing each other with different polarity, but they will repel each other if they are facing each other with same polarity.That these forces occur is very well known, but the mechanisms that create these forces are beyond the scope of this document. There are several materials of which permanent magnets may be made. 2) Working of Linear Motor as a Damper: A linear electromagnetic motor works in the straight line instead of work in rotary motion. The movement effect of this motor is very quick. L.E.M. can be used at each wheel in a vehicle which has a conventional shock and spring setup. The L.E.M. can extend as it faces any distraction like pothole and retract as it faces any bump just in milliseconds which is much greater speed than a hydraulic damper. These type of quicker retract and extract movement provides the steering stability by controlling the wheels with respect to the body of the vehicle. The L.E.M. made up of magnets and coils of wires. When current is passed through the coils, the motor retracts and extends so fastly, control unwanted movements. The speed is the major key benefit of the electromagnet. (Bose Elecromagnetic Suspension System, 2010) Fig: 3.2 (Bose Elecromagnetic Suspension System, 2010) The L.E.M. is designed in such a way so that it can give the quick respond to absorb the effects of bumps and pothols and also provides a relaxed ride. Moreover, the motor is designed such as it can supply the maximum power in a small package, which allows it to supply sufficient force to avoid the car from rolling and pitching during bad driving. At the time of acceleration, braking and cornering the L.E.M. neutralize the body motion of a car, which gives the driver a kind of driving idea and passengers comfort ride. For the smooth ride purpose, the wheel dampers are place in each wheel hub to smooth out small road imperfectionst. To generate more power an amplifier is provided which supplies the a great power to the L.E.M.s. The amplifier is a regenerative design that uses the compression force to send power back through the amplifier. (Bose Elecromagnetic Suspension System, 2010) 3.2 Goals of the magnetic design The design of the magnetic spring has the following requirements: 1. Freedom instability by one degree: In freedom instability by on degree generally the stability performance which is forecast by the non linear study is according to the formly build up linearized study. The study of freedom instability by on degree shows the relation between magnitude and velocity. As the velocity increases the magnitude increases which is increased by the stable limit cycle amplitude of vibration. Actuators are essential for stability control of every unbalanced axis. Hence the amount of unstable degrees of freedom needs to reduce. In addition to it for well organized passive vertical load bearing the direction of the unstable direction must be horizontal. 2. Ability to support large loads: Permanent magnets must be maintained on the entire weight of table plus equipment. This weight which is hold up by the electromagnets utilizes considerable amount of power which is unwanted for cost and heat reasons. 3. Effective electromagnet actuator placing: The forces which are applied asymmetrically by the actuators who apply a moment on the levitating table which would be unwanted. For rejecting vertical disturbances the electromagnet actuators must be used for the stabilizing of unstable axis. (S. J. Price and N. R. Valerio) Chapter 4 TECHNOLOGY There are three primary types of MAGLEV Technologies: One that relies on feedback controlled electromagnets (Electromagnetic Suspension or EMS). Ex.: Transrapid The another one relies on the superconducting magnets (Electrodynamic Suspension or EDS) Ex.: JR-Maglev And the last one and newer , potentially more economical system that uses premagnets i.e. Inductrack 4.1 Inductrack: A newer, perhaps less expensive system is called Inductrack. The technique used in inductrack has a load carrying capacity which is related to the speed of the vehicle, because the permanent magnets induce current in the passive electromagnetic array In the model, the permanent magnets are placed on both sides of the model; the function of these magnets is to provide horizontal lift and vertical stability. There is collection of wire loops in the track which is also called as array. There is no power supply in magnets and the model, apart from the speed of the model. The basic concept behind this system is to store the power by developing the inductrack as a motor and flywheel bearing. With only slight design changes, the bearings were unrolled into a linear track. William Post is the father of such a great innovation like inductrack. He had done this experiment at Lawrence Livermore National Laboratory. Inductrack uses Halbach arrays for stabilization. Halbach arrays are the system in which there are some arrangements of permanent magnets which stabilize moving loops of wires without electronic stabilization. Halbach arrays were initially developed for beam guidance of particle accelerators. They also have a magnetic field on the track side only, thus reducing any potential effects on the passengers. 4.2 Lift and Propulsion: In the whole world Japan and Germany are the most active in Maglev research; they have produced several difference approaches and designs. The technique used such as the train can be levitated by the repulsive of like poles or the attractive force of opposite poles of magnets. A linear motor propelled the train which is on the track or on the train, or both. In order togenerate the magnetic field which is necessary to propel the train there are massive electrical induction coils are placed along the track.(C.A. Guderjahn S.L. Wipf,2010) 4.3 Stability: Earnshaws theorem states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges. In the system the static magnetic bearing which uses only electromagnets and premagnets are unstable because of Earnshaws theorem; but the diamagnetic and superconducting magnets can support a Maglev steadily. Some conventional Maglev systems the electromagnets having electronic stability are used for stabilization. This works by constantly measuring the bearing distance and adjusting the electromagnets accordingly. 4.4 Magnet Weight The weight of large electromagnet is a major design issue. A very strong magnetic field is required to levitate the massive train, so conventional Maglev research is using superconductor research for an efficient electromagnet. Chapter 5 ANALYSIS 5.1 Dynamics of the magnetic suspension system: The basic principle of a simple electromagnetic suspension system is shown in Fig.1. the current I which is passes through the electromagnet generates the magnetic force Fm which acts opposite to the gravity and cause a steel ball to levitated position. The force relies on the current I, electromagnet properties and the air gap between the steel ball and the electromagnet.The motion of the steel ball in the magnetic field is expressed as G Fm = m d2X / dt2..(1) Where, m = the mass of the suspended steel ball, G = mg, the gravity force, X = the air gap between the steel ball and the electromagnet. The magnetic force Fm is a nonlinear function of the current I and the air gap X. The linearization of the static characteristic near the set point (F0 , X0 ,I0) is given as F = F0 + [I0 (X X0) + ]X0 (I I0).(2) The voltage equation of the electromagnetic coil is expressed as U = RI + L dI / dt.(3) Where, U = the voltage, R = the coil resistance, and L = the inductance. Inductance L=f (X, t) is a function of the air gap, the coil, the core, and the steel ball. The magnetic force which is generated by the electromagnet maintained the steady state air gap between the ball and the electromagnet is manipulated to balance the gravitational force of the ball. The small differences from the operating point are normalized over operating spaces (G, D, Imax , Umax) and they are defined as follows: f = , x= , i = , u = (4) Where, f i= the normalized resultant force, x = the normalized air gap, i = the ormalized current, and u = the normalized voltage. X^ , I^ , and U^ = the steady-state values. Substituting Eq. 4 into Eqs. 1, 2, and 3 the dynamics of the system can be presented as follows: f = -m d2x / dt2 = -m d2x / dt2 = d2x / dt2..(5) f = ]I0 x + ]X0 i , (6) u = i + (7) Let the set gains and time constants be Ke = ]X0 , Km = ]I0 , Te = , Tm = .(8) Therefore Eqs. 5, 6, and 7 can be rewritten as f = T2m d2x / dt2 ..(9) f = Kmx + Kei (10) u = i + Te .. (11) (M. Golob Boris Tovornik, 2010) The block diagram of the linearized model of the electromagnetic suspension system is shown in Fig. 5.2. The linear system described in the block diagram in Fig. 5.2 is unstable and controllable. As per the theory of vibration, there are two types of analysis, 1) The analysis of the Instability and the Vibration without damper and 2) The analysis of the Instability and Vibration with damper. These analyses were made in the electronic lab with help of the METLAB Software. For these two setups the two types of simulations were made in METLAB Software. The data used for the analysis is as follows: Table 3:Nominal System Parameters: Mass of the steel ball (m) 0.147 kg Maximum air gap (D) 0.025 m Number of coils (n) 1200 Coil re

Child Abuse Can be Reduced by Educating Parents Essay -- Violence Agai

Parenting is not instinctive. If it were, everyone who had a child would be a good parent. Consequently, child abuse is a rising phenomenon in our society. Though no single factor has been identified as the cause of child maltreatment, it appears to be influenced by parents' histories, psychological resources, and economic status. Parenting must be learned. While this is often done through experience, education courses for individuals prior to their becoming parents, and close evaluation of questionable homes could enhance parents' knowledge and the childrens' well being. A large number of abusive parents have histories of physical and emotional abuse inflicted upon them during their childhood. Thus, they were deprived of parents who taught them how to be good parents. In describing how she felt when she realized her children were being abused, Jean states: "All of a sudden I could feel all the {old} anger back and {I was} wishing that someone would have protected me when I was little"(Janko 18). Child abuse scenarios that seem tragic to others are ordinary to parents from abusive backgrounds, and often overlooked. The absence of "good" parents is detrimental to a child's learning how to fulfill parental roles. The children think their environment is normal, correct, and acceptable, and grow to emulate that lifestyle. Sometimes abuse does not stem from a lack of knowledge, but rather from a psychological disorder. The majority of abusive parents "represent a range of personality and emotional disorders"(Justice 77). An authoritarian personality is characteristic of abusive parents, as well as "drug or alcohol dependency, neurosis, mental deficiency, and/or emotional immaturity"(Justice 77). Mothers make up ... ...e discredible, teachers and other childcare workers should be trained to recognize symptoms of abuse immediately, and be required to report them. I think that we need to take our role as citizens so seriously that we value the lives of other citizens. Our Judicial system should be such that endangered children are promptly removed from their environment, as they are presently left in the situation until abuse can be proven. As a nation, children are our most valuable resource. Therefore, in attempts to better our future, we must protect the children. The problem seems to stem from a lack of child rearing skills on behalf of the parents, and a lack in the desire to be parents. Though it cannot be completely subsided, I feel that the situation can be deferred through child education courses, and close evaluation of parents bordering the "unfit" category.