An analysis for Lewis'relection following the death of his wife Assignment

An analysis for Lewis'relection following the death of his wife - Assignment Example Events involving loss or separation may occur throughout our lives (Lendrum & Syme 2004) but death is a particular form of loss that is very different from the loss of innocence or control, such as in sexual abuse or rape; or loss of status and income such as in retrenchment or unemployment. It is also vastly different from the loss of dreams or ambition such as in the birth of a disabled child. Death is not only devastating, it is final, (Lendrum & Syme 2004) and any counselling that occurs must take into consideration that bereaved persons understand this in different ways. Different individuals have varying concepts on what death brings, not only to them as the bereaved, but to the person who has died (Walton 1996). Not everyone believes in the hereafter, and that souls are reunited after death. Not all believers share the same concepts about death and resurrection (Duffey 2007). There are many variations on both philosophies. C S Lewis is well known for his Christian outlook, with an understanding that eternal life lies ahead for all souls, but a variety of these concepts exist in the community (Blank 2009). In addition, the shock of bereavement can give any person a new insight into their long-held beliefs. So allowances must be made; and jumping to conclusions, or making presumptions, must be avoided if possible (Kubler-Ross & Kessler 2007) . Just as C S Lewis had to redress his faith when his beloved wife died (Lewis 2001), many of those recently bereaved experience a shift in attitude - no matter how long they were held - that comes through shock and disbelief. Initial distress can often register as physical pain (Malkinson 2007). Lewis suffered from osteoporosis, so he was no stranger to pain, but the loss of ‘H’ struck him like an ache from which there was no relief (Lewis 2001). Reaction to the death of someone

Compare and contrast two views of how social order Essay Example for Free

Compare and contrast two views of how social order Essay â€Å"Whoever controls the media controls the mind† (Jim Morrison 1943-1971).excellent quote i had forgotten that one To establish a view on how social order is produced, in this essay the main focus will be on two researcher’s arguments both on social disorder specifically in regard to the influence of the mass media. Sociologist Stanley Cohen (1973) suggests that the media depiction of antisocial behaviour helps to construct what he labels ‘folk devils’. Whilst social scientists Stuart Hall et al (1978) argued that the mediation of disorderly behaviour led to the belief that society was in a ‘crisis’. By using my own examples and illustrations I will compare and contrast these two theories and furthermore for differentiation include a more present-day theory on social disorder through Huesmann et al 2003. Thereby through an examination of mediation (media spin) on disorderly behaviour attempt to define how one part of social order is produced in public spaces. Good clear introduction Sociologist Stanley Cohen’s theory on ‘folk devils’ which he first observed during the 1960’s media portrayal of Mods and Rockers (Making Social lives ,p378) gives an interesting oblique view on how social order is maintained, as according to is theory certain members of the public are classified as outsiders and treat like scapegoats. describe the theory a little bit here The evidence for this can be found as far back as ancient Greece Aristotle’s ‘unruly youths’ (Brake, 1980, p.1) Along with â€Å"fears of skilled pickpockets progressing to become burglars in the sixteenth century† (Shore, 2000, p. 21) and as near to our times is the example of Gypsy travellers who are and have been given the dubious pleasure of being one of the â€Å"carriers† of social evil and disorder of our days. Good use of examples This Sun headline (March 2005) on the right is just one of the many stereotypical images of gy psies, blown out of all proportion by mass media mediation and an example of that which is coined by Cohen as generating moral panic that is irrational and creates a situation â€Å"where people are both terrified and outraged† (Cohen, Making Social lives,p378). This use of inflammatory rhetoric with regards to gypsies is still being currently employed today as a Sun reporter reports he â€Å"found a community  brimming with fear and anger and villagers hell-bent on getting rid of them (Sun May 2011). These headlines from the mass media (public space) with regard to gypsies whom historically have many times been the focal point of European society’s ills and represented as’ folk devils’ very good The media campaigns of hostility against these ‘folk devils’ have not only produced moral panic â€Å"a pattern of behaviour, group of people or a condition becomes defined as a threat to society, its values and its interests† (Making Social lives, p371). This on-going mass media campaign against gypsies resulted in change the nations politics and laws to re-address social order. Such, as under sections 77-80 of the 1994 Act, [local authorities may direct persons who are unlawfully residing in vehicles on land in their own area to leave.] This an attempt to renew social order with regards to gypsies and thus allaying public fear.very good The media also played a significant role in sociologists Stuart Hall’s and co-authors (Policing the Crisis (1978) theory. Hall believed that the issue of crime was instrumental in controlling society and that the media constructions â€Å"contributed to a widespread belief that there was a crisis in society† (Making (Social lives, p378). As an illustration of some of the biased press coverage of street crime is a picture portrayed by this Sun image (Dec 2010) Hall surmises that this is how the media wishes to portray these issues to the public, as a rise in crime and disorder which can and should be treat by the government with greater policing measures and laws, which Hall terms the beginning of a â€Å"Law and Order Society† (Social lives, p378). He goes on to infer that media spin is used to distort and divert public attention from the clear problems of social injustice and inequality and that this aids government on social order policies. Evidence for this Law and Order society can be found with the introduction of the SUS (Stop and Search) powers that were used at their height when 1000 youths were stopped and searched in 5 days in what the police called Operation Swamp(bbc. Home, 25th Nov. 1981).well researched This resulted in the escalation of confrontation between the community and the police due to the locals perceiving an inequality and persecution of young blacks and this sparked off the Brixton race riots (1981). The outcome culminated in the renewal of social order with the abolition of the SUS law (1981). However they returned in another form due to 9/11 and 7/7 attacks to combat terrorism in 2007. To  compare and contrast Cohen and Halls views on mass media mediation and how the social order is maintained thro ugh public spaces it will be shown by examining that they have differences and similarities. Where both Cohen and Hall agree with regard to their theories on the issue of mediation (public spaces) is that they both believe that the focus of the mass media places spin on how social and criminal deviants (muggers) are portrayed. Also they both rely on labels to support their social disorder theories i.e. folk devil and muggers and furthermore characterising them as stereotypes. Moreover they continue to agree that the media exaggerates and amplifies and create’ scapegoats’ whose behaviours good example of compare and contrast are demonised with resulting effect on social order of creating ‘moral panic’ on the one hand and a sense of ‘crisis in society’ on the other. Where they greatly disagree is on the root causes of moral panics and social crisis in that Cohen with very little supporting evidence, believed cultural anxiety was to blame (Making Social Lives, Table 1, p383,). Whilst Hall thought that the blame led elsewhere with his inference to social inequality and racism and that the media served the state in diverting attention away from these genuine social problems (ibid).good In contrast to both Cohen and Halls views on the mediation of social disorder and the foundation of their theories on moral panic and society in crisis there is a view that has an alternative reason as to why and how the media can play a significant role in shaping social order in public spaces. This alternative view comes from the analysis of a longitudinal study (Making Social Lives, p381) by Huesmann et al on media effects, and in particularly how Huesmann and his team found a correlation between 557 children and the watching of violence on TV and a subsequent increase in propensity for aggressive behaviour in 398 of these same studied people. Therefore Huesmann et al. (2003) reached the conclusion on disorderly behaviour that there is a direct effect of media portrayal of violence. From this you can argue that in Huesmann’s view, media and mediation through public space in this case TV. can have a major negative role in the shaping of social order in society, by desensitising and normalising disorderly behaviour. Although there is no real causation evidence for these claims in Huesmann’s study and that the conclusion drawn on the media impact of television violence a chimera of other social factors very good expand on this a little. Thereby through  the examination of Cohen/Halls theories on mediation (media spin) on disorderly behaviour the following can be gleaned with regard to how one part of social order is produced in public spaces. Established norms of behaviour are created and exist in society supported by mass media and this sometimes leads to an increase in social pressure which is built up with a resulting increase in policing and law legislation (SUS laws). These societal norms are reinforced by media scapegoating of social and criminal deviants, Cohen’s ‘folk devils’ and Halls ‘muggers’. Although there are others (Huesmann et al) who believe that the shaping of social order in society is more directly influenced by TV violence alone. The methodology utilised in this essay was to shed light on the making of social order in public spaces through looking at two main theories on disorderly behaviour. And it has highlighted in my view that quite possibly genuine social problems and solutions are obscured by mediation resulting in legislation that deals with only the symptoms not the causes â€Å"The medias the most powerful entity on earth. They have the power to make the innocent guilty and to make the guilty innocent, and thats power, because they control the minds of the masses† (Malcolm X (1925-1965). Bibliography Cohen, S. (1973) Folk Devils and Moral Panics, London, Paladin. Hall, S., Critcher, C., Jefferson, T., Clarke, J. and Roberts, B. (1978) Policing the Crisis: Mugging, the State, and Law and Order, London and Basingstoke, Macmillan. Huesmann, R., Moise-Titus, J., Pdolski, C-L. And Eron, L. (2003) ‘Longitudinal relations between children’s exposure to TV violence and their aggressive and violent behaviour in young adulthood: 1977–1992’, Developmental Psychology, vol. 39, no. 2, pp. 201–23. Google Image, News.bbc.co.uk, accessed 24th /26th May 2011 Google Image, Enemiesofreason.co.uk accessed 25th May 2011 Jim Morrison (1943 – July 3, 1971) brainyquote.com accessed 20th may 2011 Malcolm X (1925-1965) thinkexist.com accessed 20th may 2011 Shore, H. (2000) ‘The idea of juvenile crime in 19th-century England’, History Today, vol. 50, no.6,pp. 21–7;

Water Level Control System Of The Tank Engineering Essay

Water Level Control System Of The Tank Engineering Essay The report provides an interim account of water level control system of a tank. The step-test experimental results for both (old and new) tanks and the method of calculating the water flow rate into the tank has been discussed. In addition, the techniques to work out the pump horsepower, motor power and the pump efficiency had been covered in this report. Future work on the laboratory experiment on proportional gain (P) and proportional plus integral gain (PI) testing and its relevance to industrial process and the approach to accomplish the set objectives of the project were discussed. CONTENT SUMMARY i CONTENT ii LIST OF FIGURES iii LIST OF TABLES iv AIM 4 OBJECTIVE 5 1.1 EXPERIMENT COMPONENTS 5 1.1.1 AMPLIFIER 5 1.1.2 SENSOR 6 1.1.5 VANE PUMP 9 1.1.5.1 PUMP TEST 10 2. LITERATURE REVIEW 12 3. CONTROLLER 12 3.1 P ONLY 13 3.2 P+I CONTROLLER 14 3.3 PID CONTROLLER 15 4. METHODOLOGY 15 4.2 P ONLY EXPERIMENT 16 4.3 P+I EXPERIMENT 17 5. RESULTS DISCUSSION ANALYSIS 18 5.1 SYSTEM TRANSFER FUNCTION 18 5.2 SYSTEM MODELLING 19 5.3 SYSTEM PERFERMANCE 19 5.4. RESULT DISCUSSION 20 21 6. CONCLUSION 21 7. REFERENCES 22 8. APPENDIX 23 LIST OF FIGURES Graph 1: Outcome of Pump Testing Graph 11 LIST OF TABLES NOMENCLATURE P Proportional PI Proportional Integral PD Positive displacement PID Proportional-Integral-Derivative PWM Pulse width modulation Qo Output Qi Input INTRODUCTION In years back level control has been a major issue in the industrial processes. The controlling of liquid level is essential in most industrial processes such as: food processing, nuclear power plants, water purification systems, industrial chemical processing, boilers etc. Although, most industrial problems such as: controlling the speed of motor, or fluid level in a tank, or temperature of the furnace are due to the installation of control process when the control concepts had not been properly understood (Dutton et al., 1997). However, the ingenuity of control engineer can often overcome these challenges by producing a well-behaved piece of equipment. Mostly, proportional-integral-derivative (PID) controllers are used for liquid level control in most applications and can be applied to many industrial processes and mechanical systems. PID controllers proven to be a perfect controller for simple and linear processes, but when it comes to controlling of non-linear and multivariable processes, the controller parameters have to be continuously adjusted (Bhuvaneswari et al., 2008). In process control systems, nonlinearity is the rule rather than the exception. Most control loops such as pressure, temperature, composition, etc., are significantly nonlinear. This may be because of nonlinearity due to control valves, or on account of variations in process gain, time constant, and dead time, as discussed in (McMillan et al, 1994). Therefore, the study of control system has contributed to huge impact positively to our modern day development. A plant can be controlled manually or automatically and the control system consists of a plant with its actuators, sensors and a controller. Manual controlling process of a plant cannot be as accurately enough compared to automatic control. An automatic controller is made up of device, electronic circuit, computer, or mechanical linkage etc. The interface between the plant and the controller requires actuators (control elements) to provide control action. In instrumentation, detectors and sensors (measurement elements) are needed to provide information about the plant status to the controller (Golten and Verwer, 1991). However, the most important characteristic of a plant is its stability, which indicates that a system can be control smoothly without undue oscillation or overcorrection. The behaviour and performance of a control system depends on the interaction of the entire element. The difference between the set-point and the actual value of the variable is called error. Another important characteristic of a control system is how quickly it can respond to an error and correct it. The smaller the error, the better it would be for the control system. The basic types of process control are open loop and closed loop system. + The open loop system has no feedback because it has no sensor to sense the fluid level in the tank. While the closed loop system is characterised by a sensor and a feedback signal which carries information from the measurement device to the comparator. Typical actuators used in liquid level control systems include pumps, motorised valve, on-off valves, etc. In addition, level sensors such as displacement float, capacitance probe, pressure sensor (Bateson, 1999), etc., provide liquid level measurement for the purpose of feedback control. In a closed loop feedback control system, the forward path transfer function is G(s) representing the process or plant being controlled together with any controller dynamics. The feedback path transfer function, H(s), represents the measurement system or transducer which provides the feedback signal (Golten and Verwer, 1991). The overall transfer function relating the controlled variable Qo to the desired value or reference, Qi is Qi Qo Figure 1: Closed loop block diagram Hence, the procedure of deriving the equation above can be found in the appendix page. In addition, the prime objective of feedback control systems is to minimise the differences between the output and the reference input since this represents the error. The control system should be quick as possible in reducing this error to zero (or to some reasonable low value) when there is either a disturbance or change in reference value (Golten and Verwer, 1991). Feedback has similar advantages when applied to automatic control system, it has the ability of controlling a system that deals with unexpected disturbances that might occur within the system and adapt to changes in the plant. Therefore, with the advancement of electronics and its applications, the understanding of close loop control system increased rapidly, since feedback amplifier is essential (Healey, 1975). A simple control system is used to maintain a constant water level in a tank, example of such is toilet systems in various homes. The swinging arm attached to the input valve of the WC water tank allows water to flow into the tank until the float rises to a point that closes the valve. When the water level is low in the tank, the swinging arm moves downwards which allows more water to flow into the tank. This continues until the swinging arm returns to its initial state. This is a simple and effective level control system for water tank. Another level of control system is a steam boiler where the level of the water in the boiler must be maintained between certain limits; otherwise, it may lead to serious damage to the boiler and building as well as cause hazard to the building occupants (Miller et al, 2004). Water gages serves as a means of measurement level in the boiler. In an engineering context, the addition of control systems must be justified in terms of their profitability, or environment safety. A control system must be effective and efficient, and remain so throughout the life of the plant (Dutton et al., 1997). The performance of a system is often expressed in terms of their parameters such as: speed of response, stability and steady-state error. A good speed of response may often be achieved at the expense of steady state error and stability (Premier, 2008)  [1]  . Stability is one of the most important characteristics in any system. For a system to be stable, the system components must be appropriatel y sized for the application and the system must be correctly adjusted (tuned). The objectives of this project is to investigate the control of water level in non-linear water tank which is fed by a centrifugal pump and discharges to a sump tank through a valve. The tank is a V shaped tank which has a straight wall. The system inflow would be adjusted alongside with the control signal to the outlet valve and the outlet pump during the simulation. Furthermore, the project task includes designing a proportional (P) only and proportional + integral (PI) controller for a specific operating point and implementing it as an analogue s-domain system. The objectives would be accomplished by examining the dynamics of the water tank, modelling it from first principles and by applying step tests to identify the system model at various operating points. The diagram below shows the equipment used to carry out the experiment. Figure 2: Water tank level control system Figure 4: Block diagram of V Shaped Tank system AIM To characterise a new V tank Conduct identification and control experimentation Comparing it with an existing replicate system OBJECTIVE Relating level control to industrial applications. Understanding the dynamics of water tank, modelling it from first principle Application of step-test to identify the system model at various operating points. Designing a proportional + integral controller for specific operating point. 1.1 EXPERIMENT COMPONENTS In order to perform the laboratory experiment on process plant (V-tank), the experimental components used are: amplifier, sensor transducer, water tank, valve, and pump which are discussed below. 1.1.1 AMPLIFIER The amplifier is a very important part of any control system. Basically, it is used to deliver an output signal which is larger, in a prescribed way, than the input signal. A good designed amplifier mostly requires that the input impedance should be large so that the source is not loaded, and the output impedance should be small so that the power element can be easily driven (Anand Zmood, 1995)  [2]  . An amplifier could be referred to as the signal conditioner use in this experiment. An am In pulse width modulation (PWM) the amplitude and repetition rate remain constant, and the width of the pulse is varied according to the modulation signal amplitude (Parr, 1996)  [3]   Pulse Width Modulated (PWM) signals are increasingly being used to drive continuous actuators such as d.c. motor, hydraulic servos and a.c. motor. If the switching frequency of the PWM amplifier is sufficiently high in relation to the actuator time constants, then the signals will be average around the value (Olsson Piani, 1992)  [4]  . The motor is driven by a Pulse Width Modulated (PWM) power amplifier, which supplies power to the motor proportional to a voltage signal from the controller. Pulses are produces at regular intervals, the duration or width of the pulse being proportional to the size of the voltage at each of the times concerned (Bolton, 1991)  [5]  . The reason why pulse width modulation is used is that conventional power amplifiers would simply burn at high power levels. The advantage of switching is that the solid-state devices are not continuously loaded with high power and therefore their power dissipation is low. This fact makes PWM amplifier very efficient. In PWM amplifier, the switching can be directly controlled from the digital output ports of a computer. 1.1.2 SENSOR In virtually every engineering application, there is the need to measure some physical quantities, such as displacements, speeds, forces, pressures, temperatures, stresses, flows and so on. These measurements are performed using this physical device called sensors, which are capable of converting a physical quantity to a more readily manipulated electrical quantity (Onwubolu, 2005). A sensor could be referred to as transducer. Although, there are different kinds of liquid level transducers which are used in variety of control applications with different function such as: float-type liquid level transducers, hydrostatic pressure liquid level transducers, capacitance probes, and so on. But with respect to this project, the pressure transducer will be the point of focus. The pressure transducer is used to measure the height (or head) level in the tank For a sensor to function effectively there is a need for signal conditioner and a display system. This signal conditional obtains signal from the sensor and manipulates it into a condition which are suitable either for display, or control system usefulness. Hence, a display system shows the output readings from the signal conditional (Bolton, 1999)  [6]  . Since the dynamic and static characteristics of the sensor or measuring element affect the indication of the actual value of the output variable, then the sensor plays an important role in determining the overall performance of the control system. The sensor usually determines the transfer function in the feedback path. If the time constants of a sensor are negligibly small compared with other time constants of the control system, the transfer function of the sensor simply becomes constant (Ogata, K., 1997). In selecting a good transducer with respect to its performance and system measurement, certain criteria had to be fulfilled. The accuracy of the transducer to which it has been calibrated, its response to error within the system, its stability i.e. the ability of the transducer to give the same output reading when used to measure a constant input over a period of time, etc (Bolton, 2008)  [7]  . 1.1.3 WATER TANK Water tank is a The tank characteristics are non linear depending on the operating point and are such that tank level surface is a function of the level. Figure 5: Tank fluid level system The objective of the controller in the level control process is to maintain a level set point at a given value and be able to accept new set point values dynamically and this level control system must be controlled by the proper controller. In considering the top section of the tank as shown in fig. 5 above, the flow-rate can be calculated using Bernoullis equation. From Bernoullis law the flow through a valve q (m3s-1) is related to the pressure head across the valve h (m) by the following equation, in which g is the acceleration due to gravity, Cd is the coefficient of discharge (m2) (Dutton et al., 1997). Modelling the Tank The tank can be modelled from first principles with the provision of certain assumptions. For the sake of simplicity, it is possible to consider the top section of the tank with parallel sides and then extend this model to deal with the whole tank. The prismatic section of the tank can be considered to be a simple rectangular tank with an inflow Q and an outflow, QL as in Figure 2. By considering conservation of matter, we can say that the flow into the tank must be equal to the flow out plus the flow converted into a change in level. but if then 1.1.4 VALVE Control valves are commonly encountered elements in process plant and the equation that describes their flow behaviour are nonlinear. Other nonlinear effects may exist because of the valve characteristic and the equipment surrounding the value. Control valves are used to regulate the flow rate of fluid in a system. The control of flow rate can be achieved by varying the size of the passage through which the fluid flows (Stenerson, 2004)  [8]  . The control valve modulates the flow of a fluid by introducing a variable area aperture into the pipeline. The volumetric flow rate, Q, of a particular liquid through a valve is proportional to the pressure drop across it, à ¢Ã‹â€ Ã¢â‚¬  P. Thus, let kv be the valve coefficient which is the function of the valve opening or lift, h. in order to avoid dimensionality, the lift, h is defined as a fractional lift, i.e. when h is 1 the control valve is fully open, and when the h is 0 the value is shut. 1.1.5 VANE PUMP In selecting a pump for a specific task, there are certain factors that needs to be considered such as: the height at which the pump will be moving the liquid to, the speed that is required, and the pressure flow at the pumps outlet. A pump is a mechanical device that changes mechanical power into fluid power. Positive displacement (PD) pumps perform work by expanding and then compressing a cavity, space, or moveable boundary within the pump. In most cases, these pumps actually captured the liquid and transport it through the pump to the discharge nozzle (Bachus Custodio, 2003)  [9]  . However, the flow through PD pump is mostly a function of the speed of the driver or motor. A D.C motor drives the pump at a constant speed in most cases so that the delivery would be constant, i.e. the flow Q is normally constant (Healey, 1975). The pressure or head that a PD pump can generate is mostly a function of the thickness of the casing and strength of the associated accompanying parts (seals, hoses gaskets). In addition, a PD pump has been designed to have some strict tolerance parts. This strict tolerance controls the flow, and pressure that these pumps can generate. The ability to pressurize the fluid to higher pressures will depend on the tolerance of the components within the pump. Hence, the closer the pumps tolerance, the higher the capabilities would be (Brumbach Clade, 2003).  [10]  Furthermore, there are three types of positive displacement pumps in use nowadays which are: vane pump, gear pump and the piston pump. These kinds of pump had different similarities depending on their performance but based on this task it would be concentrated on vane pump. Vane pump are used in hydraulic systems. When the rotor rotates the pumps vanes in a counter clockwise direction which caused the vanes to slide in and out of their slots within the pump housing, a large amount of fluid would be carried from the inlet to the outlet (Onwubolu, 2005)  [11]  . This results from the eccentricity of the centre of the rotor with respect to that of the housing. Figure 3: Vane Pump 1.1.5.1 PUMP TEST In order to examine the pumps accuracy, a test was carried out on the pump. The pump was used to move water from one container to the other within a time limit. Using the laboratory scale machine, the empty container was measured to weighs 0.585Kg. However, the pump was tested at different voltage supplied to the pump from 1v 10v at every one minute and then measured the filled container to know the actual weight. The reading was measured in kilogram (kg) which was converted to litres per minute. The conversion was 1kg to 1litre at a constant time. The outcome of the pump testing experiment could be seen in the graph below. Graph 1: Outcome of Pump Testing Graph In addition, the pump testing results obtained from the graph above shows that the pump was not functioning perfectly. The inaccuracy of the pumps efficiency is as a result of imbalance modified vanes inside the pump. The actual dimension of the vane inside the pump was 8mm inner diameter, 52mm outside diameter and 22mm thickness. The out diameter of the vane was cut-down or modified to roughly about 40mm for the vane to rotate easily within the casing. Hence, the graphs shape should be linear and not the linear curve shape in graph 1. From this experiment, it was observed that at any increase in voltage supplied to the pump; there will be large amount of pressure increase from the flow outlet and vice versa. Pump Figure 4: Modified Vane Size Figure 5: Actual Vane Size 2. LITERATURE REVIEW Literature review 3. CONTROLLER A controller is a device which monitors and influences the operational condition of a given dynamical system. In closed loop control system, a controller is used to compare the output of a system with the required condition and convert the error into a control action designed to reduce error. The error might be as a result of some changes in the conditions being controlled or because of changes in the set value. Most industrial controllers use electricity or pressurized fluid such as oil or air as power sources. Controllers may also be classified according to the kind of power employed in their operation, such as pneumatic controllers, hydraulic controllers, or electronic controllers. For this kind of controllers to be used for a particular task, it must be based on the nature of the plant and the operating conditions (Ogata, K., 1997)  [12]  . 3.1 P ONLY With proportional control the change in the controller output from the set point value is proportional to the error (Bolton, 1991)  [13]  . This means that the correction of the control element such as valve will receive signal which depends on the size of the correction required. Although, a system with a proportional control may have a steady state offset (or drop) in response to a constant reference input and may not be entirely capable of rejecting a constant disturbance (Mutambara, 1999). For higher order systems, large values of the proportional feedback gain will typically lead to instability. For most systems there is an upper limit on the proportional feedback gain in order to achieve a well damped stable response, and this limit may still have an unacceptable steady state error. Therefore, there is a limit on how much the errors can be reduced by using proportional feedback only. One of the ways to improve the steady state accuracy of the control system is to introduce integral control. Set point Error Process variable Amplifier Actuator signal Plant 3.2 P+I CONTROLLER The primary reason for integral control is to reduce or eliminate constant steady state errors within the plant or system. Several limitations of proportional control are resolved by integral control. The steady state response to this class of load disturbance is completely eliminated. Thus, as long as the system remains stable, the system output equals the desired output regardless of the value of KP and its dynamic response (Mutambara, 1999)  [14]  . If the designer wishes to increase the dynamic speed of response with large integral gain, then the response of the system becomes very oscillatory. Hence, in order to avoid this oscillatory behaviour of the system then both proportional and integral control should be used at the same time. Set point Error Process variable Amplifier Actuator signal 3.3 PID CONTROLLER Most industrial processes are controlled using proportional-integral-derivative (PID) controllers. The popularity of PID controllers can be attributed to their good performance in wide range of operating conditions and partly to their functional simplicity, which make it easy to operate (Dorf and Bishop, 2005)  [15]  . PID controllers are so effective that its controlling ability are standard in processing industries such as petroleum, refining, etc. In order to design a particular control loop system, the constants value of KP, KI and KD had to be adjusted to an acceptable performance. Increasing KP and KI tends to reduce system errors but may not be capable of also producing adequate stability, while increasing KD tends to improve stability. The combination of the three control components in this system yields complete control over the system dynamics. The proportional-integral-derivation (PID) controller provides both an acceptable degree of error reduction and an acceptable stability and damping. 4. METHODOLOGY 4.1 STEP-TEST EXPERIMENT The first part of the laboratory experiment involves determining the theoretical model at various level (h) of the water tank which include the prismatic bottom of the tank, the V shaped section and the top parallel sides of the tank. The water level in the tank was measured by a pressure sensor which was calibrated in the instrumentation laboratory prior to the experiment which showed that the pressure transducer produced a voltage signal proportional to the head. To start this experiment, the centrifugal pump was switched on and the Lab View step input programme was opened. The centrifugal pump was used to fill the water tank from a rectangular sump tank and also ensuring that there was enough water in the sump tank to perform the experiment. Although, the control valve was ensured to be fully open so that there would be continuous flow of water from the sump tank into the main tank as a result of constant running of the pump. After warming up the pump for some time, the pump bias was then set on the Lab View program to 1.3 volts (constantly) were the water is just about to start dropping into the tank. Using one second sampling time, the step volt was increased repeatedly by an additional 0.1 volts each time the head (h) settles from 0v 0.1v, 0.1v 0.2v, and so on. As a result of increases in voltage, the water level would be increased as well in the tank. Once the water level reached the top of the tank, in order to prevent the water from overflowing the step volt was reduced back to zero volt (0v) which allows the water to be empty back into the sump tank from the main tank and data or result was collected from the PC. 4.2 P ONLY EXPERIMENT In order to perform the P only experiment, the proportional gain has to be calculated to get the accurate value that would be input into the system. The proportional gain value can then be input into the LabVIEW package to run the experiment. The set point can be changed form one point to another to see how the plant would responds to the sudden changes to increase in set point The second part of the experiment entailed the design of the P only controller and P + I controller. As regards to the P only controller, once the values of the steady state gain and time constant were found from the initial step input experiment, the next step was to design a P only controller which will give closed loop dynamics 1/3 that of the open loop plant, which was then used to calculate the values of Kp at known head (h). Having calculated the Kp values, the pump was then switched on and allowed to warm up, also the Lab View P only controller programme was initiated. With the pump warmed up the Kp value was then entered into the P only controller programme alongside the same value for the pump bias and the sample time used in the previous experiment, i.e. 1.28 volts and 1 seconds respectively. The P only controller programme was allowed to run and the results for the sensor output (volts), the error (e) and the control effort were recorded and retrieved. 4.3 P+I EXPERIMENT Finally to control the level of water in the tank and eliminate the steady state error the Proportional Integral Controller experiment was initiated, the hf (design level to which the tank is to be controlled) was defined and further derivation resulted in two unknowns, Kp and TI. The values for Kp and TI were then calculated for, then input into the Proportional Integral Controller program and allowed to run with a sample time of 1 seconds. The results for the sensor output (volts), the error (e) and the controller output were recorded and retrieved. 5. RESULTS DISCUSSION ANALYSIS 5.1 SYSTEM TRANSFER FUNCTION AMPLIFIER WATER TANK SENSOR CONTROL VALVE PUMP PROPORTIONAL ONLY PROPORTIONAL PLUS INTEGRAL 5.2 SYSTEM MODELLING 5.3 SYSTEM PERFERMANCE 5.4. RESULT DISCUSSION Graph 1: Step-test experiment of voltage against time. Graph 2: Step-test experiment of voltage against time 6. CONCLUSION FUTURE WORK Filter design discussion: noise reducer 7. REFERENCES Bateson, R.N., 1999. Introduction to control system technology. 6th ed. Upper Saddle River, London: Prentice-Hall. Bhuvaneswari, N.S. Uma, G. and Rangaswamy. T.R., 2008. Adaptive and optimal control of a non-linear process using intelligent controllers. Applied Soft Computing [e-journal] (9) pp.182-190. Available through: Science Direct database [Accessed 26 November 2010]. Dutton, K. Thompson, S. and Barraclough, B., 1997. The art of control engineering. Harlow; Reading, Mass.: Addison Wesley. Girdhar, P. and Moniz, O., 2005. Practical centrifugal pumps: design, operation and maintenance. Oxford: Newnes. Golten, J. and Verwer, A., 1991. Control system design and simulation. London: McGraw-Hill. Healey, M., 1975. Principles of automatic control. 3rd ed. London: English Universities Press. Miller, R. Miller, M.R. and Oravetz, J., 2004. Audel Questions and Answers for Plumbers Examinations. USA: Wiley Publishing. Shinners, S. M., 1998. Modern control system theory and design, 2nd ed. Canada: John Wiley Sons, Inc. Wahren, U., 1997. Practical introduction to pumping technology: a basic guide to pumps. Houston: Gulf Pub. Co.

Premarital Sex And Promiscuity Theories

Premarital Sex And Promiscuity Theories This essay will be discussing the topic of promiscuity and premarital sex from both Ellistons and Punzos theories. According to Punzo on Premarital sex, it is for two people to have engaged in a sexual contact/intercourse without having the full commitment but on the other hand, promiscuity according to Elliston it is to have sex with many different people without having any commitment. When comparing both, Punzo is seen as the conservative while Elliston is seen as supporting casual sex. Punzos theory is when two people are together having sex they both must be engaged in a deep commitment between the two people. On the other hand, Elliston is arguing that sexual intercourse doesnt require any thoughts or strong consideration with any commitments since it is not that big of a deal. According to Elliston promiscuity is seen as free love, where you can just meet someone and starting to fall in love with them. With this definition, it might be easier for some to understand it, as having freedom. It can also be recognized as having recreational sex, having sex just for fun. When the word fun comes with anything, it will be seen as attractive and easy going. Elliston has created a definition himself that better defined promiscuity. Promiscuity is defined as sex with a series of other adults not directly related through marriage and with no commitments; no promises of affection, sexual exclusivity in future (Elliston 144). Elliston also stated that for those who just want to get others in bed to have sex by lying, exploiting, and deceiving or something close to it are wrong. It is seen as wrong because it breaches the ethical principles that we all learned as a child, which is not to lie. When someone is lying about everything just because they are trying to get someone in bed to have sex with them, it is seen as very unethical. Promiscuity is seen as to the advantage of males and to the disadvantage of females because it is true that males do not have anything to lose while females will lose their virginity and at times their love. It has become exploitive; woman would get social blame but man would get sexual satisfaction. Promiscuity is not actually wrong but it is the double standard that is in places where woman is at a disadvantage in comparison to man. Promiscuity can not be defined as wrong all the time; the charges that it necessarily violates generally accepted a moral principle is false. (E lliston 146). Elliston is saying that the double standard that should be remove but not the promiscuity, since it is always seen as a disadvantage for woman. The female involved might not feel the same as to being cheated or being used for the man to have their sexual satisfaction but it might be the woman who is using the man to satisfy herself. Sex is just a body language in the form of body interaction between the two people that are willing to interact and it leads to pleasure. It also has a deep meaning behind it. According o Elliston, sex is more than thrusts and moans, caresses and sighsà ¢Ã¢â€š ¬Ã‚ ¦just as verbal language has a dimension of meaning beyond phonemes and morphemes, so body language has a significance beyond the intertwining of two bodiesà ¢Ã¢â€š ¬Ã‚ ¦Promiscuity has instrumental value in that it can facilitate the mastery of one kind of body languageà ¢Ã¢â€š ¬Ã‚ ¦sexual body language is learned through sexual interactionà ¢Ã¢â€š ¬Ã‚ ¦experiences enable an individual to develop a repertoire of gestures for communicating desire and affection and of decisive movements that clearly state intentions of love or amusement. People can be moved not only by the things we say but also by the things we do-with them, for them, or to themà ¢Ã¢â€š ¬Ã‚ ¦desire and satisfaction can be communicated not only through verbal exchanges, but also through a lingering look and an appreciative caress. To a shattered ego a physical embrace may express far more reassurance than its verbal counterparts, and a kiss may convey desire more eloquently than pleas or poemsà ¢Ã¢â€š ¬Ã‚ ¦The observance of this etiquette is an acknowledgement of the selfhood of the other. The acquisition of it is one of the opportunities promiscuity provides(Elliston 149). Based on this quote, Elliston is saying sex is a part of body language and the more you practice it the better you will get. The skills that you get from promiscuity will wider range of people outside of marriage or committed-relationships. Usually a married couple would be seen as only one man is allow to have dinner with one woman, which is referring to only having sex with the partner and that is it, third party is not acceptable (traditionally). Elliston sees having sex with one person at first before you decide to love that person or not. Pretty much he i s saying having sex first will be a pre-stage of trying out whether the persons sexual skill or chemistry from sexual intercourse will help you decide to love this person or not. Therefore Elliston is arguing that promiscuity should be allow and should not be seen as wrong because it is something for the two to try out and see if the chemistry is there. In Punzos view, sex before marriage or even having sex with no commitment is seen as wrong. Punzo has answered the question of is having pre-martial sex without any commitment wrong, with using Wilsons theory of sexual intercourse to compare it with playing tennis and Chessers theory of two people going to see movies together. Both Wilson and Chesser see it normal and there is nothing morally wrong about having pre-marital sex. At the same time, Punzo has disagreed with both of them stating that going to the movies or playing tennis with many people are just some general activities which anyone can encounter, but it does not necessary have to be the one you would have sex with, or have any sexual interest with. In Punzos view, sexual intercourse must be between two committed people, so having sex without any sort of commitment is wrong. Punzo states that commitment is a must before sex, as one must agree to commit to a relationship before they can move on to a new level in their rela tionship, through having sex, the two gives themselves to each other in the way of trust, expressing ones mind, and feelings through the most intimate activity, sexual intercourse. Punzo see Ellistons argument between sex and dinning is a wrong example because dinning and sex are two different things, it is in an extreme that it has nothing to do with each other, dinning and sex has no connection at all. Dinning can be with any friends, or family members, and it does not involve any sexual contacts. Yes, dinning can be with your spouse, partner but it can also be with someone else. Both eating and sex do give people satisfaction, but they are totally different from each other. Food is a need for people to survive but people can live with out sex. Ellistons theory is to have sexual intercourse with as many people as you can before falling in love, but Punzos theory is to be in love or have the necessary commitment before having sexual intercourse. The moral perspectives of both are totally different from each other. This is why Punzo would not agree with Elliston and vice versa. Ellistons argument has a defect to it, it is having sex with a number of people does not only increase the skills of ones sexual ability, but it also limits the important value of having the most intimate relationship with the other through sexual intercourse. I believe we all know that having sex with the one we love is the most loving and special feeling of being complete as a whole. If one is engaged in a sexual activity with many other people and then stated that the one is now in love with their partner is not a rational theory, but it is also very confusing and unreasonable that promiscuity does not damage a committed relationship. Having sex without any commitment, and isolate oneself with uncommitted sex is a view that may not be true. They can have sex without any commitment but they might realize more about themselves. It doesnt mean they are isolating themselves just because they do not involve in a committed relationship. Punzos full commitment does not have a clear defi nition, does it mean to be in a legal marriage with legal documents, and so if the two are just common-law couple then does that mean they are not legal? Punzo should have clear that term and have a better explanation of it. With the mutual understanding and respects towards each other with pre-martial sex, it is not going to affect the two negatively. It would not be harm if pre-martial sex will lead the two into commitment and onto future commitment, it would become a good thing. If pre-martial sex is happening then protection is needed to prevent any unexpected or unwanted pregnancy. In conclusion, both Punzo and Elliston has their pros and cons. Premarital sex should follow Punzos theory of sex, and they must involve commitment, but not with full commitment. Punzo did not clarify what full commitment means, if it meant at the stage of being legally married, then those who are only engaged or soon to be marry couples should not be having any sexual interactions. Also promiscuity must be permitted only if no one is being hurt and lie to as a result of promiscuity. It is true that Ellistons argument of double standard needs to be remove because it is only seen as woman being the one that are at a disadvantage, but sometimes it is not the case, woman would be out to lie to man just to get money or any material that need from the man. Therefore double standard should be remove but not promiscuity. Also promiscuity is a good way to practice ones sexual skills and ability in the bed, it is true to the term practice makes prefect, it would suit this practice of promisc uity closely.

Innocent Until Proven Guilty :: essays papers

Innocent Until Proven Guilty Tabula rasa: the mind before it is developed and changed by experience. Philosopher John Locke believed that at birth and in infancy the mind is completely passive, a clean slate, tabula rasa, on which the experiences of the individual write their own impressions. (Wiener, 2134) (Any influences from drugs, alcohol, by a mother in pregnancy, etc... excluded.) It is a given that an infant’s mind is not yet fully developed early in its life. Especially at this early stage and even far on into a child’s life he is dependent on someone - whether it be his mother, father, sister, brother, or other â€Å"adult† figure, who takes care of him; ensuring his survival. True to Locke’s theory, a child’s mind has yet to be influenced by anything, hence tabula rasa. And it is also true, the experiences that a child has while growing up will profoundly dictate his character and personality. Education plays a role in an individual’s formation through the experiences in which that institution exists. Different types of people also help determine the personal nature of an individual. The experiences that one has due to the effects of his educational process, his social relationships with different types of people, and his association with various environments set the scene for his life, thus forming his individuality. Experiences are not just events that may occur, but anything that stirs emotion or evokes a feeling or reaction in a person. Experiences can range from actual events or physically engaging actions, to inanimate objects or concrete details, and even to other people. As long as a phenomenon causes a person to question, evaluate, or draw some sort of conclusion about it, and he therefore consciously or subconsciously commits it to memory, it is absolutely an â€Å"experience.† In other words, an â€Å"experience† is by definition, anything that happens to a person; anything that is seen, done, felt, or lived through. Life itself, is an experience full of experiences. All of these happenings, good and bad, are the sum of a person’s experiences called the â€Å"frame of reference.† This is the very composition that makes a person who he is. But when does one cease to rely on outside factors to prompt these experiences? When does one begin to rely on himself t o create them? Until a person reaches this point he declines to take credit for his actions and lacks responsibility.

The Character of Antigone Essay -- Antigone Plays Essays

The Character of Antigone Antigone, the character for which the play was named, is a very complex character. She seems to change directions all throughout the play and there is never one point in which you know exactly what she will do because she is just that unpredictable. This unpredictability also makes her seem very hypocritical because she will say something and then turn on a dime and say the complete opposite. Antigone’s character is very intriguing strictly due to the fact that she keeps you guessing. The following will show the many variations that her character shows throughout the play. There are several points in the play that Antigone seems very heroic, especially when she is speaking to Creon about her reasoning for attempting to bury her brother. She reflec...

Unit 5- Reflective Account

Unit 5- The principles underpinning the role of the practitioner working with children Introduction During my third placement, I worked at a nursery and children’s centre. I was based in a baby room with children aged 0-2 years old. Although I was based in the baby room I often helped out in the 2-3 room if it was busy and I was needed. In the baby room there were always three level 3 qualified early years’ practitioners. This was the same in the 2-3 room plus a support practitioner.All the children in the baby and 2-3 room had an individual learning plans; this helped the children achieve the best they could out of their time in the setting. All the planning in the setting was based on each individual child’s individual needs and was age appropriate. All the children also had key workers. The key workers carried out observations and were in charge of all the paper work involving the children in their group. Task 1- Give examples of situations in which you have w orked as part of the team P5. 1 Give examples of EACH situation in which you have worked as part of the teamAn example of a way I have worked as part of a team is helping out in the 2-3 room when the room was busy and the setting was short of staff. Another example of a way I worked as part of a team was by helping the practitioners obey parent’s wishes. An example of this was ensuring the babies didn’t sleep for longer than their parents had said. For example there were twins who were 11 months old who attended the setting 8am till 4pm and were only allowed to sleep for an hour while in the setting. I worked as part of a team to ensure the setting was safe for the children at all times.For example if the sand pit or the water tray was out, the setting made it my responsibility to sweep up any spilt sand or mop up and spilt water to prevent an accident. Another way I worked as part of a team in the setting was to ensure at meal times one of the children didn’t c onsume any of the foods he was allergic too. P5. 2 Describe how you carried out the instructions given to you in a responsible way I carried out instructions in a responsible way by helping out when I was needed in one of the other rooms.For example when it was quite in the baby room and the 2-3 room needed my help. I was asked by one of the practitioners to help her with the children’s lunches because she didn’t feel comfortable doing the lunches on her own. I carried out instructions in a responsible way by listening to the instructions given by the practitioner and did what was asked of me. Another way I carried out instructions given to me by the practitioners in the setting in a responsible way was learning each children’s care routine which was asked of me so I knew how long each child was allowed to sleep for.If I was told to put a child to sleep, once asleep I was told to record this information on the sleep chart. Because I put this child to sleep, I wa s then responsible to ensure this child didn’t go over their limit. For example, if a child could only sleep for an hour, once the hour was over I then woke up the child. I carried out instructions given to me in a responsible way by sweeping up spilt sand or mopping up any spilt water correctly when i was asked to by the practitioners. This was extremely important when maintaining any of the settings policies on health and safety.I carried out instructions given to me by the practitioners in the setting in a responsible way by sitting next to the child at snack or meal times ensuring the child did not eat any of the foods the child was allergic to. This was sometimes difficult because the child was allergic to many kinds of food. These included: tomatoes, cucumber, brown bread and apples. P5. 3 Describe how you provided feedback to team members about a task in which you have been involved When feeding or helping the children eat their lunch, I provided feedback to the practi tioners in the setting on how the child ate their lunch.For example, I provided feedback to the practitioners on what exactly the child ate, how much of the lunch the child ate, how long they took to eat it and whether or not the child fed themselves or needed help feeding themselves. I had learnt it was important for practitioners to build strong relationships with parents and I understood it was important I gave the correct feedback to the appropriate practitioners because the information was then forwarded to the child’s parents when they came to collect their child. P5. 4 Reflect on each situation and identify where you could make improvements and act on advice given to youReflecting back on each situation where I had worked as part of a team I would make some improvements on the way I acted on advice given to me. For example, when a child in the setting had slept for as long as they should, in future instead of waking them up and leaving them, I would stay with the child in till the child was properly awake. Ways I was told to do this was by sitting by the child and reading them a story, singing a song with them, distracting them with a toy or simply just talking to them in till the child got up to play.I would also make improvements when ensuring the room was safe for all the children, I would do this by in future instead of waiting for one on the practitioners to tell me sweep up spilt sand or mop up and spilt water I would do it as soon as I saw the hazards to prevent any accidents in the setting. Another improvement i would make in future would be if snack or meal times included any of the foods children were allergic to; I would make sure the foods were not accessible to the children.For example if the children were having vegetables for snack, the vegetables are usually left in the middle of the table and the children then choose which vegetables they won’t by picking them and putting them in their bowl. This was where I had to be care ful and watch the children carefully. In future I would not leave the tray in the middle of the table, id pick up the tray and go round the children asking what they wanted, this way would have made it allot easier to ensure the child didn’t eat and foods he was allergic to. Similar article: How Different Types of Transitions Can Affect Children