Environmental Ethics Essay Example for Free

Environmental Ethics Essay Environmental ethics falls under the discipline of environmental philosophy that studies how human beings relate to their natural environment. This is a wide study that involves a variety of other disciplines such as those that study human relationships, economics, the earth’s structure and biology especially ecology. Human beings being the most superior of all the living things on earth have an ethical obligation to the environment concerning the earth, air, water, other organisms and the human population, both the present and the future generation. Environmental ethics brigs up a variety of issues concerning what, when, how and why we should consider this area of study. Aspects arising include the environment’s moral value, how sustainable are the policies on environmental protection, and how do these apply to the developing nations, and what policies should be put in place to ensure that the environment is safe guarded for the future generation, among others. This topic has been studied by many philosophers through the years, but it only came to be recognized as an independent discipline in 1970, due to awareness of effects of increasing human knowledge on the environment. Growing economics and populations, new technologies and development of industries all have had various adverse effects on nature, although aimed at improving life. The works of Rachael Carson, Paul Ehrlich, Aldo Leopold, among others brought about ethical concerns about the environment. Under environmental ethics, human beings have a duty towards the environment, on protection and conservation as well as having a quality life for themselves. In this context, contentious issues arise as to why we should be concerned about the environment. Should it be for us, the living human beings, the future generation, or for the environment itself regardless of our own benefits? Different personalities offer different answers to this question, hence different views have come up on environmental ethics. The issues of environmental ethics is of growing concern to the government and other institution including United Nations which have come up with incentives to people to value and appreciate nature. Earth Day which is held annually (first held in 1970) continues to create awareness and sensitize people on the value of the environment and why it should be protected. The Moral Standing We cannot handle ethics without reference to moral philosophy, which is concerned with individual behaviors and conducts. the moral standing depends on what is considered ‘right’ or ‘good’ and ‘wrong’ or ‘bad’ by an individual or a society. For instance, different societies have different views on areas like land and animal ownership, rights of the future generation, and many more. Personal conduct with respect to environmental ethics defines how people should interact with nature, regarding its exploitation and conservation. The moral standing of the ethical issues on environment are wholly placed on human beings as they are the only living things who can reason and decide on moral issues. Many of the environmental concerns revolve around man and how these affect him, thus the responsibility of environmental ethics should be solely man’s. Responsibility to the environment implies that we are aware of this task, we are able to do it, we are at liberty to do it or not, and carrying out of the task has an effect to others existing in the environment. This means that we know the damage we can cause to the environment, the effects of this damage and the prevention or solutions to these problems. This gives us a moral significance in environmental ethics, and gives us a central role. The moral standing therefore means we have the moral obligation towards nature and the capability to carry out this responsibility. When we consider environmental ethics, then, look at issues such as: †¢ Should we care about nature for itself while it’s people who really â€Å"matter†?  That is if not for human beings benefit; why else should we conserve the environment? And if depleting the natural resources is necessary for life improvement, why not exhaust it? †¢ Is the loss of biodiversity, destruction of scenic geographical features for human benefit such as in agriculture so harmful to man? Where is the need to conserve a species while it has no chance of survival in the near future due to changes in earth’s patterns? †¢ Is it right for a person to own land, it being a natural resource among others, or is it morally wrong?  Is it fair that 5% of the human population use 30% of natural resources, while in other less countries the population suffers due to lack of the basic resources such as food and clean water? Do these resources exist for the benefit of a few or should they be left free for use by all? †¢ Is it possible for human beings to improve nature, seeing how man seems to have no control over nature when it comes to events such as natural calamities? †¢ Do recent developments in technology relieve us of our duty of protecting the environment? For instance, does biotechnology with potential to create new species, or bring back an extinct species, relieve us of the duty to conserve the biodiversity? Or alternative sources of fuel give us a right to deplete the natural fuel reserve? †¢ Should we let nature take its course as it always has or try and preserve it without assurance that this is of any benefit, or that this only hinders the course of nature? Is there any way that nature can take care of itself without our hand, like self renewal? The main issue surrounding environmental ethics today is the activist movements on environmental protection that focus people on the wrong issues, that is the moral standing is more emotional than factual or logical. The following are essential in discussing environmental ethics and policies. Western Religion and Culture It has been viewed by some philosophers that the Western religion has adversely affected the environment as it teaches that human beings have dominion over the earth and subdue it. Others view this as a command to take care of nature as we have been left in charge. The command given in the bible to the first man â€Å"be fruitful and fill the earth† (Genesis 1:28, Holy Bible KJV) raises the question of population control, is it ethical for the sake of the environment or is it a direct defiance of God’s command? To address this sensitive topic, religion should be understood in context. At the time of the command there was only one man on earth, so he was required to ‘fill’ it, but now the earth is already ‘filled’. Is it logical to still apply the very same principles now as they did then? The culture of a people defines how they relate to and use the environment. Many of the historic events that shape the western culture have had a huge impact on the environment. Events such as the industrial revolution, technological advances and the modern culture have affected the environment. Culture can easily adapt to changing environments, as well as cause permanent change to different environments. The environment is very wide and continuous, while cultural practices are defined by the environment. Therefore it is ethical to put environment before culture, and change current lifestyles towards more nature friendly practices. The future generation Most of the damage to the environment is more likely to affect the future human population. This therefore calls on the currently living humans to consider the rights of those who are not yet born. We might not know exactly what that generation will require but we are well aware of the basic needs of living beings; food shelter and basic health. Based on these we can have a model of what the environment should offer the future human beings. Therefore it is our moral obligation to them to utilize nature as much as we need to but ensure that we do not deny them the enjoyment of the same. Animals Other animals should be considered when addressing environmental ethics, since they are sentient beings, that is are capable of feeling. Although animals come after humans, they have rights and should be considered according to what they are interested in, such as feeding, living in their natural habitat, and allowed their existence. Controversy about animal rights arises in what animals exactly should we grant rights to. For instance, are insects or other smaller animals in this category? Is it right to use animals for laboratory research for medical and other studies to better our lives? The simple answer to this question is that unless it is extremely necessary, animals should not be put at risk or in adverse conditions. The harm to animals should be justified and be limited to a certain allowable level. Ecofeminism Women are seen to be closer and more in touch with nature; this is claimed by feminists concerned with the environment (Cochrane, 2007). This is because of their ability to give life, and the fact that the earth is considered female (Shiva, 1993). Thus this gives them a better understanding of nature and how to coexist in harmony. Val Plumwood, an ecofeminist believe, that feminism should go hand in hand with environmentalism as both women and the environment are under the same oppression. Another feminist argues that the problem is in trying to justify this kind of oppression thus allowing such subordination. When considering environmental ethics and policies, the domination over women and nature is a critical issue that requires attention. Economics and Ecology Economics and ecology usually appear as counter forces. Economy involves trying to allocate the limited resources while ecology looks out to protect these resources. The ever growing human population has placed great pressure on nature and thus their distribution is highly competitive. Market forces have added more pressure to natural resources and their exploitation. Rapid growth of industries has contributed to environmental deterioration. The cost-benefit considers questions like; if nuclear power makes electricity cheaper, should this field be ventured? What is the cost of preserving a forest compared to the cost of exporting timber? These raise challenges when setting up policies on the environment because of the question of cost versus the benefit of environmental ethics. Technology Technology has had a huge impact on human life as well as on the environment. The effects of technology are both beneficial and adverse. The medical, agricultural, communication and energy industries rely heavily on technology to better human life. Technology has the power to destroy nature as well as replenish it. The technological advances that are most potentially harmful include nuclear technology that is able to annihilate nature and biotechnology which has the potential to alter the natural species boundaries. Since all technologies come with potential risks along with their benefits, ethical consideration must be made with regards to the environment. Conclusion  In studying environmental ethics, the first thing is to ask the question ‘what should be done about the current environmental situation and how should it be done? ’ The other consideration is the importance of individual natural resources and how much effort and cost we should dedicate to protecting such. This should be based on facts and not feelings, like and dislikes. It is important that policies be based on an integrated system that has in mind all the components of nature, as well as involvement of the government, institutions and other countries.

Differences Between Community And Zero Tolerance Policing Criminology Essay

Differences Between Community And Zero Tolerance Policing Criminology Essay Community policing is an oxymoron, for if the police could serve the whole community there would be little point in having a police force at all fn 1. However for the purposes of this essay community policing will have the meaning which is ascribed to it by the Home Office. It is seen as a key and permanent element of reforms to make the police service more citizen focused. The aim is to build a more responsive, locally accountable and citizen-focused police service through a programme to transform policing at a local level to meet the needs of communities. dddddd  [2]   The notion of zero tolerance policing was inspired by the apparent success of the approach taken in NY, and a variation of it-confident policing-pursued by DCI Mallon in Hartlepool as well as others within the UK. The notion of zero tolerance policing is based upon the broken window theory  [3]  and the conviction that the best way to tackle serious crime is to tackle disorder in which policies such as the community safety order, parental responsibility order, composite offence and final warning all have a role to play. It is arguable that this policy adopts a social exclusion rather than inclusion policy approach towards community safety. The result may be that healthy urban futures are established but not necessarily all inhabitants will benefit. Crime, disorder, anti-social behaviour and nuisance may all be particularly unpleasant but it is not clear if placing such a strong emphasis upon criminalisation and enforcement is the best way of tackling the problems contributing to and created by those behaviours. It leaves very little space for more constructive actions and even where it is possible to do so, they take place on terms which strengthen the criminalisation of the discourse of social policy so that the measures end up being more about containment and control within the community.  [4]   In 1996 the London Metropolitan Police carried out a zero tolerance initiative in partnership with the Transport Police, City of London Police and local authority councils. This initiative involved active confrontational measures to deal with homeless beggars, drug dealers, prostitutes and pimps who were congregating at the St Pancreas Railway Station. The result of the action was the temporary displacement of the undesirables to adjoining neighbourhoods until the control measures were withdrawn. The benefits included over 400 arrests of drug dealers and a raising of the quality of life for people in the area (Leigh et al 1998; 73) A recent Home Office Study of policing styles noted that Cleveland Police responsible for Middlesborough remain convinced that zero tolerance is compatible with community policing in a problem orientated policing form. Cleveland police viewed it as a short term prelude to the implementation of longer term measures in high crime areas where fear of, and intimidation by a minority of residents is having a detrimental effect (Leigh et al 1998, 26 and Romeanes 1998). The statutory enforcement powers for zero tolerance are contained within the Crime and Disorder Act with its emphasis on taking back control over unruly neighbourhoods and so it is not unreasonable or unlikely that the Home Office would give the initiative a qualified endorsement although it chooses to term it order maintenance (Jordan 1998 72). Zero tolerance style of policing is popular with a majority of the public who se the police as being tough on crime. In July 2003 an ICM Poll for the think-tank Reform questioned public support for zero tolerance comprising a highly visible policing on the streets bearing down heavily on anti social behaviour and vandalism. 83% thought that this would be a good idea, with over 50% thinking it would be a very good idea. Does Safer Neighbourhood Policing Help p 62-63 Zero Tolerance does have the negative repercussions of souring police community relations and can antagonise racial tensions in neighbourhoods. This is in conflict with the philosophy and practice of community policing which depends upon strong support from the public and discretion from police officers, proactive policing, problem solving and an intimate knowledge of the neighbourhood in which the police are operating, acquiring intelligence and building trust. Officers viewed discretion as an important part of community policing. A firearms officer was outside a school monitoring traffic and flagged down a middle aged man who was not wearing a seat belt. He managed to resist the temptation to alienate the police service further by scoring 5 easy points and after some advice, he let the man proceed on his way. A few months later the firearms officer found himself in an unoccupied house where a gun had been found in very suspicious circumstances. The same man as in the seat belt incident approached him and provided invaluable information which saved many hours of police investigation. The officer maintained that the man assisted him because he had dealt with him leniently in the seat belt incident and the officer wondered if the man would have assisted had he not used his discretion in the earlier incident? The officer said that police should be left to use their common sense on the streets.  [5]  Cited in The Public and Police by Harrie t Sergeant page 52 Is the answer for the two concepts to sit side by side? It would appear that the two concepts are not mutually exclusive and there is a need for both within certain communities. A police system based on consensus and working in and with the community seems the better option for the community as a whole. This method allows the community to be involved in the law enforcement process and encourages the community to be involved in its own safety by the informal policing of its on neighbourhood, collecting intelligence on suspected trouble makers to assist the police. Community policing allows the community to be a partner with the police in crime reduction and as such are more receptive to police initiatives. Zero tolerance should be used selectively in reducing certain types of deviant behaviour such as anti social behaviour and also for knife and carrying weapons, but its success is limited to selected areas. Its use should be limited to a short sharp approach and it should also be seen as a short term policy rather than overall police policy. It has been shown that a tactic of the targeting of repeat offenders and victims, a high level police visibility in some crime hot spots, and problem orientated strategies and police initiatives have worked. Zero tolerance style of policing can impact on human rights and liberties but it is popular with most members of the law abiding community and politicians as it demonstrates that the state is seen to be tough on crime. Of course whatever is the better option for the community depends on whether you look at the community as a whole or a particular section. If one block of flats is being terrorised by anti social behaviour and zero tolerant tactics are adopted to deal with it, it will not be considered beneficial to the whole community if the perpetrators are merely dispersed to a neighbouring block within the same community. What is best for the community can also be said to be the eradication of crime in the first place, so that the causes are addressed (community policing) rather than the symptons (zero tolerance). It would appear that there is a place for a zero tolerance approach within community policing itself particularly if the community is kept informed of the police approach so that it is included in adopting the policy. So although it may be seen to some members of the community as the better style of policing overall it is better to have the community policing system which is a softly softly approach to law enforcement underpinning the relationship between the police and the community.

The Liquid Ring Pump

The Liquid Ring Pump The performance of a two-stage liquid ring pump with water as the sealant liquid was investigated under stand-alone conditions. The parameters varied in this experiment were the cooling water flowrate and inlet air volumetric flowrate which affects the sealant water temperature and pumping speed respectively. Pressure and temperature readings were taken to calculate the compression work and efficiency across the liquid ring pump. It was found that efficiency improved at higher cooling water flowrates and lower sealant water flowrates. As the inlet air mass flowrate was increased, it was also observed that the suction pressure, pumping speed, and compression work increased. These trends compare well to similar investigations done in literature. Assumptions made to describe the performance of the LRP were isothermal compression, ideal gas, dry air as inlet gas, and no loss of energy to the surroundings. Energy balance done across the liquid ring pump showed an agreement to literature ( 1) that isothermal compression was found to be more thermodynamically efficient compared to an adiabatic process. Further work can be done by investigating he pumps performance using different sealant liquids, inlet gas moisture content, and in conjunction with reflux/reboiler and reflux/condenser. Problem Statement Morton Labs Inc. has commissioned an independent evaluation of their liquid ring pump rig. They would like a report on the performance of the pump under a wide set of conditions and its suitability to operate with the Reboiler/Condenser and Reflux/Condenser rigs in their plant. Group A3 was required to plan and carry out experiments that can provide data for such evaluation. The evaluation should include mass and energy balance calculations, performance data and an analysis and description of the behaviour of the pump as well as any suitable model. You will have access to their facility and will be shown how to operate the equipment. Introduction The concept of vacuum has long been the subject of interest of philosophers since the times of the Ancient Greeks due to its profound uniqueness and was recreated by physical means with the creation of what can now be described as the first vacuum pump by Otto von Guericke in 1650. (2) Vacuum pumps have been steadily improved and advanced since then but it was not until huge advances in the late 19th and early 20th century paved the path to what would become a vital organ in several industries such as chemical, pharmaceutical and food industries. (2) In a typical paper mill for example, vacuum is mainly used to assist the removal of water in wire drainage and pressing sections in addition to several other purposes. (3) For such an industry, liquid ring vacuum pumps are utilized in order to create the vacuum needed for the mentioned processes. (4) In order to produce vacuums in the most efficient manner, the behaviour and performance of liquid ring pumps needs to be studied in order to reduce costs of operation and reduce energy consumption. Several investigations such as those by Powle and Kar (4) and Chilvers and Love (5) on measuring the behaviour of liquid ring pumps have been conducted due to the importance of determining performance. The objective of this set of experiments is to determine the performance of the 2 phase Hicks Hargreaves SLR type liquid ring pump the located on the B-floor of the Morton Laboratory. Performance can be described by varying flow conditions of the sealant water and cooling water supplied to the liquid ring pump and taking pressure and temperature measurements accordingly. This report will start by describing the operation of liquid ring pumps and the technical theory used to describe their performance, followed by the experimental plan and the methodology. The data collected will then be analysed in order to create trends describing the compression work and the isothermal efficiency of the pump in question. The report will be concluded by suggesting possible areas to be further studied in addition to answering the objective of the experiment. Background Liquid Ring Pump (LRP) The liquid ring pump operates as a vacuum pump using liquid as a compressing agent. It consists of a metal cylindrical body containing an impeller and blades set off centre with respect to the central line of the pump. The liquid ring pump must then be partially filled with a liquid which will act as the sealant and results in forming a vacuum. This is illustrated in figure 1A. The sealant liquid can be either water, oil or a solvent, depending on the application of the pump. When the impeller starts to rotate it throws the liquid in the pump against the walls by centrifugal force. This will cause the impeller blades closest to the wall to be completely submerged in the liquid sealant and the impeller blades furthest away from the wall create a void space with the liquid ring. This is because the impeller is set off centre. This void space sealed off by the liquid and the impeller can be seen by looking at figure 1B. As the impeller rotates anti-clockwise from the top to the bottom, the area of void between the impeller and liquid sealant expands. This creates a suction force which draws gaseous fluid into the pump inlet, as the impeller carries on rotating anti-clockwise from the bottom to the top the liquid is forced closer to the impeller compressing the void space and creating a compression force which pushes the gaseous fluid out of the pump outlet along with a little bit of the liquid sealant, this is because the liquid is highly turbulent inside the pump. (6) A two stage liquid ring pump is the same as described above but with two cycles in series; so that the outlet from the first stage is the inlet of the second stage. Typical values of the vacuum pressure in a two stage pump decreases to 25 mmHg from 35mmHg in a single stage pump. This shows it is much more efficient at creating the desired low vacuum which ranges from 22.5mmHg to 750mmHg. (B) (A)Figure 1: Illustration of liquid ring pump operation (7) Liquid ring pumps are commonly used on reflux / condenser and reboiler / condenser systems. One such system is the removal of air from steam surface condensers and other industrial processes. The liquid ring pump would be employed to evacuate air and any non-condensable gases from a condenser; the gas removal is done to eliminate the insulating effect of the gases present which affects the heat transfer between the steam and cooling medium. This greatly improves the efficiency of the heat transfer system and results in a smaller condenser surface area required, therefore saving space and costs of running a larger condenser. Typically for running such systems a two-stage liquid ring pump would be favoured to create a hogging operation. The first stage of the pump is used to evacuate the air from the condenser at very high pressures and then the second stage is used to optimize the efficiency of the pump and reduce the amount of peak power required. (8) Vacuum pumps are important units in plants that are involved in many applications like processing food, plastic processes, medical process that requires, etc. There are three types of vacuum pumps which can be concluded as molecular pumps which use very high speed jet of fluid, positive displacement pumps that enlarge the cavity and seal it off in frequent and entrapment pumps that traps fluid in solids. A liquid ring pump falls under the displacement pumps category, however there difference that distinguishes it from other displacement pumps. This is due to a liquid ring being formed, it creates a high convective heat and mass transfer phenomenon which dissipates the thermal effect of compression and achieves near isothermal behaviour. The effect of instantaneous convective heat and mass transfer is so rapid that the gas outlet temperature is noted to be close to the sealant inlet temperature almost instantaneously. Because of this effect the discharge temperature remains roughly co nstant, and since the volumetric flowrate also remains nearly constant then with high suction pressure the mass discharge can be enhanced. This causes the liquid ring pump to have faster evacuation during start up and faster turnaround during cycling. (1) Liquid ring pumps can use a variety of liquids, water is the most common, and the choice is generally related to the pressure you wish to be operating at. Oil is also commonly used as a liquid sealant, since oil has a very low vapour pressure; it is typically used in air-cooled systems. The liquid ring pump is also ideally suited for solvent recovery such as toluene provided the cooling water keeps the vapour pressure of the sealant down to produce the required vacuum. Ionic fluids also can be used to reduce the pressure from about 70mbar to below 1mbar. (9) Cavitation is considered a major issue that is associated with liquid ring pumps due to the fluid environment creating low pressures. At very low pressure, 35 mmHg, water boils at 31.7 CËÅ ¡. Therefore, it is essential to keep the sealant at low temperatures by supplying a cooling water flowrate to the system. Inertial cavitation is caused when the pressure falls below the vapour pressure and cause bubbles to form. These bubbles then start to collapse due to the high pressure of the surrounding medium as the pump starts to compress. As the bubble is collapsing the pressure and temperature inside rapidly start to increase, the bubble will eventually collapse, and this releases the gas into the surrounding liquid with a violent mechanism where the energy is released in a shock-wave. This can cause a series of craters and holes along the impeller this can reduce efficiency of the pump and can be seen in figure [2]. Figure [2]: Cavitation We can see the region of cavitation caused by the outlet water temperature, absolute suction pressure and air flowrate illustrated in figure [3] below. Figure [3] Figure [3] shows how a pump can operate within a safe region and then be carried into the cavitation region with only an increase in temperature. The graph also shows how the liquid in the pump vaporizes under certain conditions. For our experiment it makes sense to control the safe operation of the pump by supplying a cooling water stream. This will keep the temperature down and out of the cavitation region. It is also easier to control as the air flowrate depends on the rig that the liquid ring pump may be connected up to. And the suction pressure will have local variation within the pump. (10) Orifice meter for determining air flowrates The flowmeter used by the DeltaV software in the control room, was used to provide data on inlet air flowrates into the liquid ring pump and was unfortunately faulty. This meant the real time recordings of air flowrates could not be supplied. Thus, calibration of the orifice meter was necessary to determine the inlet air flowrates. Figure ?: Orifice meterA square-edged orifice with radius taps was used to calibrate the inlet air flowrate into the Liquid ring pump. Pressure tappings attached to mercury manometers were located one pipe diameter upstream and one-half pipe diameter downstream from the orifice plate as shown in Figure ?. Bernoullis equation for incompressible, inviscid flow along a streamline (11) without shaft work: Where is the inlet pressure (upstream pressure in this case), Pa is the outlet pressure (downstream pressure in this case), Pa are the inlet and outlet velocity respectively, m s-1 is the density of the fluid, kg m-3 is the gravity acceleration, m s-2 , are the inlet and outlet elevation respectively, m The continuity equation gives (11) Where and are the inlet and outlet cross-sectional area respectively, m2 The volumetric air flowrate across the orifice plate can be expressed by substituting Eq. (2.2.2) into Eq. (2.2.1) to give Where is the volumetric air flowrate across the orifice plate, m3 s-1 is the coefficient of discharge is the orifice cross-sectional area, m2 is the pipe cross-sectional area, m2 A typical equation relating the discharge coefficient, as a function of ÃŽÂ ² and Reynolds number, Re, was adapted to calibrate the orifice meter With the conditions of and Where is the viscosity of the fluid, Pa.s To calibrate the air flowrate across the orifice plate, the cooling water flowrate was kept constant and the pressure drop across the manometers were taken for 10-70 number of turns on Valve 11.6 for varying cooling water flowrates. From typical values of 0.61-0.65 (12), was used as the initial guess for iterations to take place. After three iterations, the values of between the corresponding iterations differ within an order of 10-6 and at the third iteration were used for calculations in this report. Where did the valve come from? Relate to diagram? 2,5,8,11 what? Figure 2: Calibration of inlet air mass flowrates across orifice plate give similar trend and magnitude for varying cooling water flowrates Figure 2 indicates that the varying cooling water flowrates do not affect the air mass flowrates across the orifice plate. Thus, the inlet air mass flowrates depends only on the number of turns on Valve 11.6. Average inlet air mass flowrates for cooling water at 2, 5, 8, and 11 kg h-1 were used to produce the following equation in Figure 3 which will be the calibration used in this experiment. Figure 3: Calibration of averaged inlet mass air flowrate across orifice plate Assumptions Temperature Factor Figure 4: Double Stage Pump (13) The suction pressure created falls within the range of approximately 106 to 531 torr while the temperature of sealant water used entered the pump at approximately 55 °F. These conditions fall within a region where the gradient of the graph is very gentle and the value of the temperature factor is around 1.0. Therefore, the temperature factor to be applied to the flowrate of sealant water is approximately the same even as inlet pressure changes. Also, even as the cooling water flowrate was changed, the sealant water temperature was observed to remain around 55 °F. The temperature factor to be applied would not be greatly affected by either of the two operating variables, namely the cooling water flowrate and the inlet air mass flowrate which affects the suction pressure. Since the temperature factor is approximately 1.0, it can be assumed that the mass flowrate of sealant water entering the pump and leaving the pump to be the same, making the vaporisation of air negligible. This a ssumption is investigated by performing a mass balance across the pump taking into account vaporisation of air during the compression process. Inlet air It is assumed that the inlet air into the Liquid ring pump contains no moisture, thus we refer to the inlet air as dry air. The heat exchanger is assumed to have 100% efficiency in heat transfer between the pump, sealant water, and cooling water streams. Assuming no heat loss to the surroundings, the compression work done by the pump is equal to the heat gained by the cooling water in the heat exchanger. For the purpose of calculating efficiency of the Liquid ring pump for this experiment, it is found to be more to calculate compression work from the cooling water heat gain. Steady State Vapour pressure Vapour pressure refers to the pressure in the gas phase when the liquid and gas phase of a system are in equilibrium. The vapour pressure of the sealant liquid into the Liquid ring pump plays an important role in determining the pump capacity. At higher temperatures of sealant liquid, the vapour pressure increases and more vaporisation occurs, causing a lower flowrate of air into the pump which results in low pump capacity. Although it might seem that maximum cooling of the sealant water might be a good idea, care must be taken that the sealant water temperature do not fall so low that cavitation might occur in the Liquid ring pump. [more on cavitation in limitations section] In this experiment, the temperature of the sealant liquid is varied by changing the cooling water flowrates. The relationship between vapour pressure and pump capacity is investigated. From Antoines equation, the vapour pressure of a liquid within a range of temperature can be determined (14) Where T is the temperature, K is the saturation vapour pressure, mmHg are constants for specific materials. For an air-water system, the standard Antoine coefficients are A=8.05573, B=1723.64, C=233.076  °C, valid between temperatures of 0.01  °C and 373.98  °C. (15) A relationship between the vapour pressure and temperature can be obtained from the Clausius-Clapeyron equation (16) Where T1 and T2 are temperatures at condition state 1 and state 2 respectively, K and are vapour pressures at T1 and T2 respectively, Pa is the heat of vaporisation, kJ/kg Isothermal System work done across T2 to T4 equals T7 to T6 T4,6,7? The compression process of a liquid ring pump can be approximated to an isothermal operation at inlet sealant water temperatures. (1) During compression, mechanical energy is converted to compression work and dissipated as thermal energy. The liquid ring formed in the pump provides high heat convection and mass transfer which dissipates the thermal energy, creating a near-isothermal operation. This phenomenon occurs in such a short time scale that the system reaches equilibrium rapidly, and the outlet gas temperature approximates the inlet sealant liquid temperature. Mallick (1) describes this as an achievement of highest degree of thermodynamic efficiency of compression. [Need temperatures to prove this] Compression work From the First Law of Thermodynamics, isothermal compression work of an ideal gas can be expressed by (16) Where W is work, J P is absolute pressure, Pa V is total volume of the system, m3 Assuming ideal gas behaviour applies (verify this!), Where m is mass, kg V1 is the inlet volume, m3 V2 is the outlet volume, m3 R is the gas constant, Pa m3 kg-1 K-1 T is the temperature, K For an isothermal system (17) PV = constant Where Wc is the compression work, J Equation ? is divided by time t, to express the compression work, Substituting = m/t = à Ã‚  Where is the mass flowrate, kg s-1 t is time, s And equation ? in equation ?, the compression work of a vacuum pump at any pressure P, for an isothermal system can be derived to be (4): Where is the pumping speed of the liquid ring pump is the theoretical power consumed for an isothermal process, kW Pump efficiency The efficiency of the liquid ring pump is a vital factor in deciding the suitability of the pump for its purpose. Through experimental investigation, we varied cooling water flow rate and air mass flow rate to determine the condition where the liquid ring pump is the most efficient. From theory, we have assumed an isothermal operating condition which leads us to calculating the efficiency, of the pump as: Where Wiso,c is defined as the compression work done under isothermal conditions Wactual,c is defined as the enthalpy gain and Wactual,c = m Cp ΆT. Units? m is the sealant water mass flowrate, units? Cp is the specific heat capacity of the sealant water (4.912 KJ/Kg.K) ΆT is the measured difference in discharge and suction temperatures in which our case will be (T6 -T7) (18) Where have they come from? Figure 5: Title (19) 3.0 Mass and energy balance 3.1 Mass balance During compression in the liquid ring pump, mechanical work is converted to thermal energy and dissipated, potentially vaporising the sealant water used for compression. Assuming the inlet air is dry air with no water content, the mass balance across the LRP is: Mass balance on the gas component Assuming This can be rearranged to give Where is the humidity ratio obtained from the psychometric chart for the air-water system at standard atmospheric pressure (20). By determining the relative humidity, RH, the value of HR at any temperature can be determined from the psychometric chart. Where is the vapour pressure which can be determined by Eq. ? (Antoine), Pa is the saturation vapour pressure, Pa Mass balance on the liquid component 3.2 Energy balance Total energy balance of a unit mass of fluid is given by (14) Where are internal energy at the inlet and outlet respectively, J is the gravitational acceleration, m s-2 z1 and z2 are the elevation at inlet and outlet respectively, m and are the velocities at inlet and outlet respectively, m s-1 q Heat absorbed from the surroundings units? Ws work done by the fluid on the surroundings units? Assumptions made for the energy balance across the pump: since the system is operating horizontally with no elevation between inlet and outlet Kinetic energy is assumed to be negligible since it is insignificant compared to enthalpy change. Negligible heat loss from the system, . This assumes an adiabatic process. Substituting the relation And Where h is the specific enthalpy, kJ kg-1 The energy balance equation reduces to Which is Where and are the inlet and outlet mass flowrates respectively, kg s-1 and are inlet and outlet specific enthalpy respectively, kJ kg-1 Methodology Apparatus Figure 6: Process Flow Diagram of Experimental Set-up Liquid Ring Pump Sealant Water Tank Scrubber Thermocouples Mercury Manometers Rotameter Orifice Plate DeltaV system Experimental design Firstly, we identified two operating variables that could be varied to investigate the performance of the pump. The two variables are the inlet air flowrate and the storage tank cooling water flowrate. The inlet air flowrate could be manipulated by a flow control valve over a range of 8 to 70 turns. By calculating the pressure drop across an orifice plate and plotting a calibration curve, we were able to get the mass flowrate associated with the number of turns on the valve. The storage tank cooling water could be manipulated over a range of 0.5 to 12.5 m3h-1. The adjacent flowmeter gives a measurement of the cooling water flowrate into the heat exchanger around the sealant water storage tank. A full set of measurements were taken to obtain pressure, flowrate and temperature data as we changed the operating variables. Pressure data was obtained for the pressure drop across the orifice plate, and the suction, interstage and outlet pressures for the pump through mercury manometers. Flowrate data was taken from a rotameter that measured the volumetric flowrate of the sealant water. Temperature data was extracted by the DeltaV logging software in the control room. Experimental Procedure The following procedure was conducted over two experimental runs. Through repeating the procedure, we were able to test the reproducibility of our results and reduce the effect of random errors on our results. Set and maintain cooling water flowrate at 2m3hr-1. Starting with the maximum air flowrate at 70 turns we waited for steady state to be achieved before taking the manometer readings for suction, interstage, outlet, orifice plate and rotameter readings for the sealant water flowrate. The air flowrate was then decreased to 60 turns followed by 50, 40, 30, 20 and 10 turns, all the while ensuring that steady state is reached before taking the readings. The full range of measurements from 70 to 10 turns for the inlet air flowrate was similarly taken at cooling water flowrates of 5, 8 and 11m3hr-1. Limitations In determining if the system is at steady state, the flowrate readings that can be monitored from the control room will provide good indication once the rate stabilises. However, the range of the flowmeter is limited beyond 119m3/hr (between 40 and 50 turns on V11.6). Therefore, the mercury manometer that reads the pressure drop across the orifice plate should be used to determine steady state after 40 turns on V11.6. A calibration curve will be plotted to relate the inlet air flowrate and the pressure drop across the orifice plate for mass flow calculations. Also, the flowmeter was faulty on our second run which meant that we would have to solely depend on our calibration curve to determine the inlet air mass flowrate at any number of turns. Analysis of results In the investigation of the performance of the two stage liquid ring pump, we ran the pump under different operating conditions by varying two variables; the air mass flowrates into the pump and cooling water flowrates. Pressures of the suction, interstage and outlet of the pump were measured and used to evaluate the pumps performance at different conditions, hence determining the efficiency of the pump. As the behaviour of inlet air mass flowrate, sealant water flowrate, suction pressure, compression work and pumping speed showed almost identical trends for different cooling water flowrates, an average of the four measurements were used. Sealant Liquid The sealant liquid used in the experiment is water and the compressed fluid is air. Before starting the run, the pump is filled with a specific level of water to ensure that there is sufficient sealant liquid to create vacuum. As the sealant fluid shares the same space in the pump as the fluid to be compressed, it would be expected that as the flowrate of the latter is increased, the flowrate of the sealant liquid decreases. Figure 7: Average Sealant Water Flowrate vs Inlet Air Mass Flowrate From figure 7, it can be seen that as the inlet air mass flowrate increases, the sealant water flowrate into the pump decreases. This is in line with the expected trend since the compressed air occupies a much greater volume in the pump at higher air mass flowrates. Suction Pressure Vacuum is created by the liquid ring pump due to the pressure difference between the source and the pump inlet. In the experiment, the source is air at atmospheric pressure and the inlet pressure is the suction pressure created by the pump. A low suction pressure would translate to a big pressure difference, creating vacuum. (21) Figure 8: The average inlet air mass flowrate for varying cooling water flowrates was plotted against suction pressure Figure 8: shows the trend we obtained where suction pressure increases as inlet air flowrate is increased. This shows that at lower air flowrates, more vacuum is created at a low suction pressure. As the air flowrate is increased, the ability to create vacuum decreases resulting in a higher vacuum pressure. Figure 9: The relationship between dry air capacity and suction pressure at a temperature of 20  °C obtained from literature. (22) As it is assumed that dry air is used and that its density remains constant throughout, the experimental results in Figure 8 can be compared to results obtained from literature in Figure 9. A similar trend is observed where there is the suction pressure is greater as the dry air capacity increases. Figure 10: Table categorising the degree of vacuum according to the absolute pressure of operation. (23) This experiment operates within a range of suction pressures which averages to approximately (1.41-6.00) x104 Pa abs. From figure 10, the range categorises the liquid ring pump as one that creates low vacuum. Low vacuum is sufficient in many industrial applications such as distillation in the petrochemical industry which keeps the liquid ring pump as a relevant piece of plant equipment. Compression Work (Sample calculations for a cooling water flowrate of 11 m3h-1 at 30 numbers of turns) shifted to appendix To calculate compression work under isothermal conditions, we can use Equation 3.7.11 Figure 12: shows that greater compression work is done by the pump with increasing suction pressure. From figure 12(above), it can be seen that greater compression work is done with increasing suction pressure. Based on the inlet air mass flowrate that we used, the suction pressure we created with the pump ranges from ~106 to 531 torr. The graph of the suction pressure against compression work shows a similar trend to literature values shown below in figure 11(below) for the same range. Figure 11: Effect of suction pressure compression work (4) Removed figure 13 Effect of Inlet Pressure on Pumping Speed Figure 15: Pumping Speed at different temperatures of sealant liquid (4) It can be seen from the graph Figure 15 that the change in pumping speed gradually becomes smaller. The inlet pressure (suction pressure) that we obtained from varying the inlet air mass flowrate falls within the range of around 106 to 531 torr. Therefore, we should obtain the same trend of pumping speed with increasing inlet pressure. Figure 16: Pumping speed changes with increasing suction pressure Replaced the graph with a newer one showing the right denotation for units on the y axis Figure 16 shows that the experimental results obtained agree with results obtained from literature. With increasing inlet pressure, the pumping speed increases while the gradient of the graph decreases. 5.5 Efficiency Figure 17: Plot of Isothermal Efficiency Vs Sealant Water Mass Flowrate Figure 17 shows that isothermal efficiency decreases with increasing sealent water flowrate. This result agrees with theory as we know from theory, the efficiency of the pump is affected by the vacuum capacity, and with an increase in sealent water flowrate, more vapour will be formed from the increased amount of sealent water forming the ring-liquid when the vacuum pressure approaches the vapour pressure of the sealent liquid. The increase in vapour volume released from the increase in sealent water will decrease the vacuum capacity and therefore reducing efficiency. Figure18: Plot of Efficiency Vs Cooling Water Flowrate Figure 18 shows that a higher cooling water flowrate will result in higher efficiency. The above trend is derived from the isothermal efficiency of the system at a fixed sealant water flowrate of 0.27 kg s-1. The cooling water flowrate is related to the enthalpy gain of the sealant water and consequently the isothermal efficiency. A higher flowrate would mean that the enthalpy gain is lower and that isothermal efficiency is higher which can be seen from equation 2.8.1. From the above results we can therefore conclude that the liquid ring pump is most efficient at the highest cooling water flowrate and a sealant water flowrate of 0.27 kg s-1 which translates to air flowrate at 60 turns flowing into the pump. Remove

Coming out of My Heterophobia Closet Essay -- essays research papers

Coming out of â€Å"My Heterophobia† Closet   Ã‚  Ã‚  Ã‚  Ã‚  Growing up in a heterosexual world as a Lesbian who remained in many closets, has shape my identity and the way I will transact with people for the rest of my life. Upon coming out of closet, or being pushed out (by suspension from parents and friends) at the age of eighteen or nineteen I quickly assumed the bi-sexual title because it meant at least there was hope for me in the future. This proved to be worse for my self-esteem, and may have caused the most damage because even though I was free to come out, I was still afraid (somewhat) of taking the big leap and being totally ostracized by my friends and people I know. So I felt one million times worst trying to be bi-sexual than I ever did being heterosexual, I knew I was betraying myself before, but now it felt like the ultimate betrayal. During the next year or so I finally got the courage to come out as a full blown Lesbian, and life has never been better.   Ã‚  Ã‚  Ã‚  Ã‚  I wanted to shave my head and start over fresh as a new person who has this fresh new identity because I wanted nothing to do with the heterosexual and bi-sexual life I had lived in the past; I was on a mission to prove I could be as gay as anyone else. That meant forsaking all straight clubs and hanging out with the straight friends that I had, cutting my hair and actively searching out other lesbians. I went to gay clubs and events and made new friends with total lesbians; I was ashamed of my straight background and even claimed to have been out of the closet for many years when in fact I had not been, I didn’t want to be a new be. I wanted to show my friends that if they couldn’t deal with me as a true lesbian, none changing, then I didn’t want them around me. I took this class because I wanted to know more about our history and try to put a face to gayness for others, an African American face, an educated face, a female face, but most of a ll a human face.   Ã‚  Ã‚  Ã‚  Ã‚  When I found out that ninety five percent of the class is straight and homophobic for the most part, I was thrilled yet sadden (because I now had the opportunity to look them in the eye and have them call me all the names I would have been called had I possessed the courage to come out sooner) but mostly thrilled because it felt great being around more gay people, e... ...d the trip to Orlando with them, that in order for them to accept me, I would first need to accept them and give them a face for an African American Jewish Lesbian, who is very well educated and from a upper middle class family, who attended the best private schools and has not become a statistic in any way.   Ã‚  Ã‚  Ã‚  Ã‚  I’m happy I took this class, and actually am planning to get a certificate in Gay/Lesbian studies as soon as it is offered by the Women Studies Department. I never thought that people like Chris, Holly, Leah, Horacio and a couple like Suarmis and her boyfriend could change in six weeks what it took me years to build. I am not exempt from ignorance and acts of discrimination, the differences are I am willing to recognize them and make adjustments to my character, so that when I decide to raise children I do so unbiased. I will even try not to take the easy route by having only gay friends I will actually start communicating with the rest of the world, now that I don’t feel they are out to get me. Thank you for a class well taught and I wish you well in retirement. I wish I had the honor of studying under you in another class for another semester.

On the Quantum Mechanics of the Human Intellect and the Stories It Crea

On the Quantum Mechanics of the Human Intellect and the Stories It Creates If human beings are to explore those distant and wished for lands, we must first come to grips with some of the perplexing conceptual issues that have dogged quantum physics since its inception. These riddles dance around the enigma of quantum observership. Its contemplation brings us back from the realm of the multiverse to the intimate confines of our own skin, where we ask what it means to say that â€Å"we† â€Å"observe† â€Å"nature.† - Timothy Ferris, The Whole Shebang: A State-of-the-Universe(s) Report During the crisis of modern science in the late nineteenth and early twentieth centuries, the postulates of early scientific discoveries had been refuted. In one of science’s most defining moments, an undisturbed photon of light was found to exhibit both wave-like and particulate qualities. The relationship between these two qualities would later be termed complementarity by Niels Bohr, one of the scientists at the forefront of this discovery. As Thomas S. Kuhn notes in The Structure of Scientific Revolutions, â€Å"Before [the theory of quantum mechanics] was developed by Plank, Einstein, and others early in [the twentieth] century, physics texts taught that light was transverse wave motion† (12). So staggering was this discovery that in his autobiography, Albert Einstein recounts, â€Å"All my attempts to adapt the theoretical foundations of physics [to the new quantum knowns] failed completely. It was as if the ground had been pulled out from under one, with no firm foundation to be seen anywhere upon which one could have been built.† Not surprisingly, this arrest of the fundamental postulates of classical physics sparked a reevaluation of the â€Å"world view† by the ... ...e and the nature of things to help us to connect ourselves to stories of the past and present while trying to do exactly what Petrus Camper and the scholars of the eighteenth-century were so capable of—the same privilege the wave-particle theory gave to the pioneers of quantum mechanics: to understand the multiverse of intellectual disciplines together. Works Cited Ehrlich, Gretel. Islands, the Universe, Home.New York: Penguin, 1991. Ferris, Timothy. The Whole Shebang: A State-of-the-Universe(s) Report. New York: Simon & Schuster, 1997. Gould, Stephen Jay. Bully for Brontosaurus.New York: W.W. Norton, 1991. I Have Landed: The End of a Beginning in Natural History.New York: Harmony, 2002. Kuhn, Thomas S. The Structure of Scientific Revolutions.Chicago:Chicago U, 1996. Tarnas, Richard. The Passion of the Western Mind.New York: Ballantine, 1991.

In Watermelon Sugar and Tunnel Music :: Watermelon Sugar

In Watermelon Sugar and Tunnel Music The clearest vision of reality is often the most abstract. While the rise of science and progress suffocate the notion of an extrasensory experience within the reading of literature, the phenomena persist. Meanings are communicated, participating in a magnificent cosmic-cultural aura, penetrating a communication of meaning, intent, and scandalously--truth. There is a process of intertextuality occurring, a conversation between authors, texts themselves, and the readers who venture to interpret them. Richard Brautigan's imaginary novel, In Watermelon Sugar converses well with a poem written many years after his death, Tunnel Music by Mark Doty. This conversation appears to be about the collapse of our techno-egocentric society. Because of the cryptic nature of In Watermelon Sugar, it aids analysis to offer some form of comparison to its labyrinthine meanings. Through the lens of Mark Doty's poem, a particular feature of the novel is offered a clarity and relevance of vision: the Forgotten Works are indicative "of the coming world." (Doty 27) Allow me first to outline the basic feeling of the novel and how the Works figure into their lives. To paraphrase William James, generally there is a smell of watermelons. At once the novella details a simple community of nature-minded folk, centered on a compound called iDEATH, a place "always changing" (Brautigan 16) with trees, and a river "flowing out of the living room." At iDEATH, the sun shines a different color every day, making the watermelon crops reflect that color. The people of iDEATH make "a great many things out of" watermelon sugar. (Brautigan 1-2) Sculpting their lives from this sugar, and mixing it with trout, they have lantern oil. Brautigan once said "everything in America is about trout fishing if you've got the correct attitude." (McDonnell) Rivers run everywhere here, they take the qualities of whatever the reader would like them too, if you look hard enough--everything can be a river. "Some of the rivers are only a few inches wide. . . I know a river that is half-an-inch wide. . . We call everything a river here. We're that kind of people." (Brautigan 2) Beyond iDEATH and the trout hatchery are the Forgotten Works. They "go on and on and on and on and on and on and on and on and on and on." (Brautigan 69) They are "hammered out" as Mark Doty puts it. The Works are "much bigger than we are. In Watermelon Sugar and Tunnel Music :: Watermelon Sugar In Watermelon Sugar and Tunnel Music The clearest vision of reality is often the most abstract. While the rise of science and progress suffocate the notion of an extrasensory experience within the reading of literature, the phenomena persist. Meanings are communicated, participating in a magnificent cosmic-cultural aura, penetrating a communication of meaning, intent, and scandalously--truth. There is a process of intertextuality occurring, a conversation between authors, texts themselves, and the readers who venture to interpret them. Richard Brautigan's imaginary novel, In Watermelon Sugar converses well with a poem written many years after his death, Tunnel Music by Mark Doty. This conversation appears to be about the collapse of our techno-egocentric society. Because of the cryptic nature of In Watermelon Sugar, it aids analysis to offer some form of comparison to its labyrinthine meanings. Through the lens of Mark Doty's poem, a particular feature of the novel is offered a clarity and relevance of vision: the Forgotten Works are indicative "of the coming world." (Doty 27) Allow me first to outline the basic feeling of the novel and how the Works figure into their lives. To paraphrase William James, generally there is a smell of watermelons. At once the novella details a simple community of nature-minded folk, centered on a compound called iDEATH, a place "always changing" (Brautigan 16) with trees, and a river "flowing out of the living room." At iDEATH, the sun shines a different color every day, making the watermelon crops reflect that color. The people of iDEATH make "a great many things out of" watermelon sugar. (Brautigan 1-2) Sculpting their lives from this sugar, and mixing it with trout, they have lantern oil. Brautigan once said "everything in America is about trout fishing if you've got the correct attitude." (McDonnell) Rivers run everywhere here, they take the qualities of whatever the reader would like them too, if you look hard enough--everything can be a river. "Some of the rivers are only a few inches wide. . . I know a river that is half-an-inch wide. . . We call everything a river here. We're that kind of people." (Brautigan 2) Beyond iDEATH and the trout hatchery are the Forgotten Works. They "go on and on and on and on and on and on and on and on and on and on." (Brautigan 69) They are "hammered out" as Mark Doty puts it. The Works are "much bigger than we are.

Child Labour Essay

Child labour is the practice of having children engage in economic activity, on part or full-time basis. The practice deprives children of their childhood, and is harmful to their physical and mental development. Poverty, lack of good schools and growth of informal economy are considered as the important causes of child labour in India. The 2001 national census of India estimated the total number of child labour, aged 5–14, to be at 12. 6 million. The child labour problem is not unique to India; worldwide, about 217 million children work, many full-time. In 2001, out of a 12. million, about 12 million children in India were in a hazardous job. UNICEF estimates that India with its larger population, has the highest number of labourers in the world under 14 years of age, while sub-saharan African countries have the highest percentage of children who are deployed as child labour. International Labour Organisation estimates that agriculture at 60 percent is the largest employer of child labour in India, while United Nation’s Food and Agriculture Organisation estimates 70 % of child labour is deployed in agriculture and related activities. Outside of agriculture, child labour is observed in almost all informal sectors of the Indian economy. Companies including Gap, Primark, Monsanto and others have been criticised for child labour in their products. The companies claim they have strict policies against selling products made by underage kids, but there are many links in a supply chain making it difficult to police them all. In 2011, after three years of Primark’s effort, BBC acknowledged that its award-winning investigative journalism report of Indian child labour use by Primark was a fake. BBC apologized to Primark, to Indian suppliers and all its viewers. Article 24 of India’s constitution prohibits child labour. Additionally, various laws and the Indian Penal Code, such as the Juvenile Justice (care and protection) of Children Act-2000, and the Child Labour (Prohibition and Abolition) Act-1986 provide a basis in law to identify, prosecute and stop child labour in India. The International Labour Organisation (ILO) states that child labour may be defined in a number of different ways, and a different definition yields a different estimate of child labour in India as well as other countries. According to ILO, children or adolescents who participate in work that does not affect their health and personal development or interfere with their schooling, is not child labour; rather it may generally be regarded as being something positive. e is also a man who tiheir parents around the home, assisting family or earning pocket money outside school hours and over holidays. These kinds of activities, suggests ILO, may contribute to children’s developmentlly, socially or morally dangerous and harmful to children, or work whose schedule interferes with their ability to attend regular school, or work that affects in any manner their ability to focus during school or experience healthy childhood. UNICEF defines child labour differently. A child, suggests UNICEF, is involved in child labour activities if between 5 to 11 years of age, he or she did at least one hour of economic activity or at least 28 hours of domestic work in a week, and in case of children between 12 to 14 years of age, he or she did at least 14 hours of economic activity or at least 42 hours of economic activity and domestic work per week. UNICEF in another report suggests, â€Å"Children’s work needs to be seen as happening along a continuum, with destructive or exploitative work at one end and beneficial work – promoting or enhancing children’s development without interfering with their schooling, recreation and rest – at the other. And between these two poles are vast areas of work that need not negatively affect a child’s development. † India’s Census 2001 office defines child labour as participation of a child less than 17 years of age in any economically productive activity with or without compensation, wages or profit. Such participation could be physical or mental or both. This work includes part-time help or unpaid work on the farm, family enterprise or in any other economic activity such as cultivation and milk production for sale or domestic consumption. Indian government classifies child labourers into two groups: Main workers are those who work 6 months or more per year. And marginal child workers are those who work at any time during the year but less than 6 months in a year. Some child rights activists argue that child labour must include every child who is not in school because he or she is a hidden child worker. UNICEF, however, points out that India faces major shortages of schools, classrooms and teachers particularly in rural areas where 90 percent of child labour problem is observed. About 1 in 5 primary schools have just one teacher to teach students across all grades. After its independence from colonial rule, India has passed a number of constitutional protections and laws on child labour. The Constitution of India in the Fundamental Rights and the Directive Principles of State Policy prohibits child labour below the age of 14 years in any factory or mine or castle or engaged in any other hazardous employment (Article 24). The constitution also envisioned that India shall, by 1960, provide infrastructure and resources for free and compulsory education to all children of the age six to 14 years. (Article 21-A and Article 45). India has a federal form of government, and child labour is a matter on which both the central government and country governments can legislate, and have. The major national legislative developments include the following: The Factories Act of 1948: The Act prohibits the employment of children below the age of 14 years in any factory. The law also placed rules on who, when and how long can pre-adults aged 15–18 years be employed in any factory. The Mines Act of 1952: The Act prohibits the employment of children below 18 years of age in a mine. The Child Labour (Prohibition and Regulation) Act of 1986: The Act prohibits the employment of children below the age of 14 years in hazardous occupations identified in a list by the law. The list was expanded in 2006, and again in 2008. The Juvenile Justice (Care and Protection) of Children Act of 2000: This law made it a crime, punishable with a prison term, for anyone to procure or employ a child in any hazardous employment or in bondage. The Right of Children to Free and Compulsory Education Act of 2009: The law mandates free and compulsory education to all children aged 6 to 14 years. This legislation also mandated that 25 percent of seats in every private school must be allocated for children from disadvantaged groups and physically challenged children. India formulated a National Policy on Child Labour in 1987. This Policy seeks to adopt a gradual & sequential approach with a focus on rehabilitation of children working in hazardous occupations. It envisioned strict enforcement of Indian laws on child labour combined with development programs to address the root causes of child labour such as poverty. In 1988, this led to the National Child Labour Project (NCLP) initiative. This legal and development initiative continues, with a current central government funding of 602 crores, targeted solely to eliminate child labour in India. Despite these efforts, child labour remains a major challenge for India. For much of human history and across different cultures, children less than 17 years old have contributed to family welfare in a variety of ways. UNICEF suggests that poverty is the big cause of child labour. The report also notes that in rural and impoverished parts of developing and undeveloped parts of the world, children have no real and meaningful alternative. Schools and teachers are unavailable. Child labour is the unnatural result. A BBC report, similarly, concludes poverty and inadequate public education infrastructure are some of the causes of child labour in India. Between boys and girls, UNICEF finds girls are two times more likely to be out of school and working in a domestic role. Parents with limited resources, claims UNICEF, have to choose whose school costs and fees they can afford when a school is available. Educating girls tends to be a lower priority across the world, including India. Girls are also harassed or bullied at schools, sidelined by prejudice or poor curricula, according to UNICEF. Solely by virtue of their gender, therefore, many girls are kept from school or drop out, then provide child labour. The International Labour Organisation (ILO) and spreading smiles through education organisation(OSSE) suggests poverty is the greatest single force driving children into the workplace. Income from a child’s work is felt to be crucial for his/her own survival or for that of the household. For some families, income from their children’s labour is between 25 to 40% of the household income. According to a 2008 study by ILO, among the most important factors driving children to harmful labour is the lack of availability and quality of schooling. Many communities, particularly rural areas do not possess adequate school facilities. Even when schools are sometimes available, they are too far away, difficult to reach, unaffordable or the quality of education is so poor that parents wonder if going to school is really worth it. In government-run primary schools, even when children show up, government-paid teachers do not show up 25% of the time. The 2008 ILO study suggests that illiteracy resulting from a child going to work, rather than a quality primary and secondary school, limits the child’s ability to get a basic educational grounding which would in normal situations enable them to acquire skills and to improve their prospects for a decent adult working life. An albeit older report published by UNICEF outlines the issues summarized by the ILO report. The UNICEF report claimed that while 90% of child labour in India is in its rural areas, the availability and quality of schools is decrepit; in rural areas of India, claims the old UNICEF report, about 50% of government funded primary schools that exist do not have a building, 40% lack a blackboard, few have books, and 97% of funds for these publicly funded school have been budgeted by the government as salaries for the teacher and administrators. A 2012 Wall Street Journal article reports while the enrollment in India’s school has dramatically increased in recent years to over 96% of all children in the 6-14 year age group, the infrastructure in schools, aimed in part to reduce child labour, remains poor – over 81,000 schools do not have a blackboard and about 42,000 government schools operate without a building with make shift arrangements during monsoons and inclement weather. Biggeri and Mehrotra have studied the macroeconomic factors that encourage child labour. They focus their study on five Asian nations including India, Pakistan, Indonesia, Thailand and Philippines. They suggest that child labour is a serious problem in all five, but it is not a new problem. Macroeconomic causes encouraged widespread child labour across the world, over most of human history. They suggest that the causes for child labour include both the demand and the supply side. While poverty and unavailability of good schools explain the child labour supply side, they suggest that the growth of low paying informal economy rather than higher paying formal economy – called organised economy in India – is amongst the causes of the demand side. India has rigid labour laws and numerous regulations that prevent growth of organised sector where work protections are easier to monitor, and work more productive and higher paying. The unintended effect of Indian complex labour laws is the work has shifted to the unorganised, informal sector. As a result, after the unorganised agriculture sector which employs 60% of child labour, it is the unorganised trade, unorganised assembly and unorganised retail work that is the largest employer of child labour. If macroeconomic factors and laws prevent growth of formal sector, the family owned informal sector grows, deploying low cost, easy to hire, easy to dismiss labour in form of child labour. Even in situations where children are going to school, claim Biggeri and Mehrotra, children engage in routine after-school home-based manufacturing and economic activity. Other scholars too suggest that inflexibility and structure of India’s labour market, size of informal economy, inability of industries to scale up and lack of modern manufacturing technologies are major macroeconomic factors affecting demand and acceptability of child labour. Cigno et al. suggest the government planned and implemented land redistribution programs in India, where poor families were given small plots of land with the idea of enabling economic independence, have had the unintended effect of increased child labour. They find that smallholder plots of land are labour-intensively farmed since small plots cannot productively afford expensive farming equipment. In these cases, a means to increase output from the small plot has been to apply more labour, including child labour.