During The 1920s, A Biologist Named Jean Piaget Proposed A Theory Of C

During the 1920s, a biologist named Jean Piaget proposed a theory of cognitive development of children. He caused a new revolution in thinking about how thinking develops. In 1984, Piaget observed that children understand concepts and reason differently at different stages. Piaget stated children's cognitive strategies which are used to solve problems, reflect an interaction BETWEEN THE CHILD'S CURRENT DEVELOPMENTAL STAGE AND experience in the world. Research on cognitive development has provided science educators with constructive information regarding student capacities for meeting science curricular goals. Students which demonstrate concrete operational thinking on Piagetian tasks seem to function only at that level and not at the formal operational level in science. Students which give evidence of formal operational thinking on Piagetian tasks often function at the concrete operational level in science, thus leading researchers to conclude that the majority of adolescents function at the concrete operational level on their understanding of science subject matter. In a study by the National Foundation of subjects in Piaget's Balance Task were rated as being operational with respect to proportional thought development. In addition, seventy-one percent of subjects did not achieve complete understanding of the material studied in a laboratory unit related to chemical solubility. The unit delt with primary ratios and proportions, and when overall physical science achievement was considered, about forty-three percent of the formal operational studies were not able to give simple examples of the problem that were correctly solved on the paper and pencil exam (Inhelder & Piaget, 1958, p. 104). Piaget was primarily concerned with the developmental factors that characterize the changes in the child's explanations of the world around him or her. Piaget's early research showed three parallel lines of development. First, from an initial adualism or confusion of result of the subject's own activity with objective changes to reality to a differentiation between subject and object. Second, from a phenomenological interpretation of the world to one which is based on objective causality. Third, from a unconscious focusing on one's own point of view to a decentration which allocates the subject a place in the world alongside other persons and objects. In functional terms, these concepts are termed assimilation and accommodation in reference to interaction with the physical world, and socialization in reference to interaction with other people (Inhelder & Sinclair, 1974, p.22). Piaget's states many secondary level science courses taught in the past at the have been too abstract for most students since they are taught in lecture or reception learning format. Thus, students who only have concrete operational structures available for their reasoning will not be successful with these types of curricula. Programs using concrete and self-pacing instruction are better suited to the majority of students and the only stumbling block may be teachers who cannot understand the programs or regard them as too simplistic. Since the teacher is a very important variable regarding the outcome of the science, the concern level of the teacher will determine to what extent science instruction is translated in a cognitively relevant manner in the classroom. Educators who prefer to have children learn to make a scientific interpretation rather than a mythological interpretation of natural phenomena, and one way to introduce scientific interpretations is to analyze any change as evidence of interaction. One way in which this teaching device can function is if there is an instructional period of several class sessions in which the students are engaged in "play" with new of familiar materials; followed by is a suggestion of a way to think about observations; lastly there is a further extermination in which the students can explore the consequences of using their discoveries . Through the process of guided discovery, the student goes from observation at the beginning to interpretations at the end (Athey & Rubadeau, 1970, p. 245). In Piaget's study of the operations that underlie the system of scientific concepts related to number, measurement, physical quantities, and logical classes and relations, structural models were needed to explain the processes involved in the formation of these concepts (Inhelder & Sinclair, 1974, p. 23). The grouping of classes and relations describe the characteristics of the end product of process of growth as a particular system of mental operations. The logical

Free Essays on An Intellectual Biography Of George Lamming

Intellectual Biography: George Lamming. George Lamming, born in Carrington Village, Barbados, was of mixed English and Black African heritage, and grew up in his native township of Carrington Village and also in St David's Village, which was the workplace of his adopted father. Unlike many his age, Lamming had the opportunity of an education and with encouragement and particular influence from a teacher, Frank Collymore, Lamming became entangled into the world of literature, and the experiences books had to offer. Before long he began his own early writings before moving, and working from 1946 to 1950 as a teacher at ‘El Colegio de Venezuela’, which was a private boarding school for boys in Port of Spain, Trinidad. Lamming was then to once more move, this time across the ocean to England where Lamming worked briefly in a factory of London whilst working independently as a freelance writer, having already published some of his works in the Barbadian magazine ‘Bim’. Lammings’ time spent in England was of great benefit in terms of his writing aspirations and Lamming had the opportunity to meet fellow Commonwealth citizens, Africans and Asians, and become aware of the problems and issues of ‘identity’ for the African Diaspora’s. George Lamming is one of the pre-eminent writers and novelists of the early generation West Indian writers, and it can be argued that his first piece of work, the novel ‘In the Castle of My Skin’, is the most widely read ‘Black’ novel to date. It was also this novel, wrote in 1953 that many believe to be the catalyst that allowed Lamming his rise to prominence. It was described as an ‘autobiographical novel of childhood and adolescence written against the anonymity and alienation from self and community that the author experienced in London at the age of twenty-three’. Lammings’ works were largely an expression of awareness and enlightenment of sorts, and he used them directly i... Free Essays on An Intellectual Biography Of George Lamming Free Essays on An Intellectual Biography Of George Lamming Intellectual Biography: George Lamming. George Lamming, born in Carrington Village, Barbados, was of mixed English and Black African heritage, and grew up in his native township of Carrington Village and also in St David's Village, which was the workplace of his adopted father. Unlike many his age, Lamming had the opportunity of an education and with encouragement and particular influence from a teacher, Frank Collymore, Lamming became entangled into the world of literature, and the experiences books had to offer. Before long he began his own early writings before moving, and working from 1946 to 1950 as a teacher at ‘El Colegio de Venezuela’, which was a private boarding school for boys in Port of Spain, Trinidad. Lamming was then to once more move, this time across the ocean to England where Lamming worked briefly in a factory of London whilst working independently as a freelance writer, having already published some of his works in the Barbadian magazine ‘Bim’. Lammings’ time spent in England was of great benefit in terms of his writing aspirations and Lamming had the opportunity to meet fellow Commonwealth citizens, Africans and Asians, and become aware of the problems and issues of ‘identity’ for the African Diaspora’s. George Lamming is one of the pre-eminent writers and novelists of the early generation West Indian writers, and it can be argued that his first piece of work, the novel ‘In the Castle of My Skin’, is the most widely read ‘Black’ novel to date. It was also this novel, wrote in 1953 that many believe to be the catalyst that allowed Lamming his rise to prominence. It was described as an ‘autobiographical novel of childhood and adolescence written against the anonymity and alienation from self and community that the author experienced in London at the age of twenty-three’. Lammings’ works were largely an expression of awareness and enlightenment of sorts, and he used them directly i...

OPERATIONS & FINANCIAL DECISION MANAGEMENT Essay

OPERATIONS & FINANCIAL DECISION MANAGEMENT - Essay Example 1. As per the abbreviated balance sheet dated 31.1.2006, the stock levels on 31/1/2007 was  £ 1382,592 as compared to  £ 1132,505 on 31/1/2006. Thus, there has been an increase of 22.08% over the previous year. Moreover, it is seen that the inventory components of stock in the company consists of many small items supplied by different manufacturers . Among these, items like envelope, envelope scoop, padded cover, inflator fans, basket, burners and cylinders form the main constituents of the finished product – the inflatable balloons. It is seen for these crucial stock items, there may be only one or two approved suppliers. Therefore, it needs to be ensured that delivery and quality aspects need to be strictly looked into, since the safety aspects of these air balloons cannot be compromised since it involves human safety and security. Moreover, if it is needed to change suppliers of crucial items, it become necessary to get recertified from the approval body for safety and security which may not be an easy task. Therefore, it is felt that given the fact that there are many sub assembly parts and components involved in the making of an air balloon, it is necessary to maintain a higher level of stock inventories. Lead time: The manufacture of hot air balloons involves a specialist task entailing maximum safety and standard control adherence, and nothing could be left a chance in the manufacture of hot air balloons. In the case of ordering being placed for resupply, the delivery may take time, depending upon the type of raw materials and the time required for reorders. For the supply of fabrics, the lead time may be around 8 weeks. Again, in the case of other items, the lead time would be a period ranging from 3 days to 3 months, depending upon market conditions and availability of materials reordered. Sometimes it may happen that the items may not be available in ready stocks with the vendors/suppliers, and therefore, it may

Accounting Speech or Presentation Example | Topics and Well Written Essays - 2000 words

Accounting - Speech or Presentation Example bove financial statements, prepaid rates were deducted from the rate expense in the profit and loss account since the rates paid in advanced does not adhere to the year 20X1 and the expense is of the next year rather than of the current year. Hence it is not included in calculating the net profit. A business is considered to be going concern if there is no intention to terminate the business in the near future. However, if the business is short of working capital and the owner is unable to pay of its creditors, the business may be forced to close. The prudence concept is intended to prevent profit from being overstated. Overstating the profit can have serious drawbacks for a business. If the profit is overstated, the owner may believe that his income is higher than it really is, and may withdraw too much money from the business. This may lead to shortage of cash and eventually to the failure of the business (Randall 48). Hence it is extremely important for a business to show a realistic a profit figure on its financial statements and it is better for profit to be understated rather overstated. This principle of preventing the profit to overstate is also known as principle of conservatism. So the prudence concept is aimed at ensuring that the profits are realistic and not overstated. The business should record its transactions in the same way in the same accounting period and in all the future periods. The accounting methods used by the business should remain consistent. The concept of consistency is important to ensure that the profits or losses of different periods, and the balance sheets can be compared to achieve better results. In the above financial statements, business uses a straight line depreciation method for fixtures and fittings. According to the consistency concept, the business should consistently use this method for fixtures and fittings in the future as well and should not switch to other depreciation methods. John Higgins may issue preference

What Ethics Means to the Writer Assignment Example | Topics and Well Written Essays - 500 words

What Ethics Means to the Writer - Assignment Example Personally, I believe that ethics involves knowing the difference between wrong and right, specifically through a process in which one figures out whether a certain action should or should not be carried out. For instance, if presented with a chance to shoplift in a supermarket due to a commotion, knowing that shoplifting is wrong and stopping me from doing it is being ethical. However, doing it even in the knowledge that it is wrong would be unethical. Obeying the law is also a part of being ethical, for example, ensuring that one has car insurance is a legal requirement and, therefore, ethical, while failing to acquire car insurance despite being required to do so for safety purposes is unethical. Ethics are also important in one’s career with numerous individual choices in the workplace being made on a daily basis. Whether one is a CEO or an employee, choices related to ethics will have a unique set of circumstances and significance, as well as the potential to produce diverse results. Ethics play a critical and constant role in the corporation and in an individual employee’s career. For example, the code of conduct and ethical behavior materials are obligatory in most corporations and the ability to follow these regulations and rules ensures that the individual is able to further their career without disciplinary issues and, therefore, it is important to follow the required ethics in the workplace. Finally, ethics are also important in society, which can be seen by the number of topics that have given rise to ethical debates in the US, such as organ donation after death and use of non-renewable- fossil fuel. Ethical debates in society normally have wide relevance, do not have definitive answers, and often involve very sensitive areas or topics.

Calorimeter Process

Calorimeter Process 1. Introduction The report as a study for nozzle operated under pressure difference from 0.1 to 10 bars. Under this specification the report discuss the next point. The factor affecting on the nozzle efficiency Application in natural gas Effect of nozzle efficiency on the quality of combustion and how the quality of combustion could be enhanced 1.1. Definition The nozzle defined as: device setting in the flow path to achieve change in pressure, temperature and the velocity also it can defined as an mechanical device designed to achieve controlling process on the direction or characteristic of the fuel flow as it exits or entry it can take the shape of an closed chamber or pipe via an orifice . Reference: http//www.Engineeringtoolbox.com 1- Pressure We con notice that when the fluids flow through the nozzle as the pressure increased the discharge rate also increased and all other factor remains constant. The relationship between the pressure and discharge from a nozzle exit is A fundamental equation. The theoretical discharge from any nozzle Given by the next relation. Flow rate = CA (2gh) 5 C Means the dimensionless coefficient for the particular nozzle in question. A Means the area of the nozzle orifice. h- Means the pressure head applied to the nozzle. G Means the acceleration of gravity. As the pressure acts in the nozzle exit it directly affect to the stream of fuel .let us compare in the below figure between the gas stream with different pressure. 1- Differential pressure flow meters In case of the differential pressure drop this device used to calculate the flow by measuring the pressure drop over an obstruction inserted in the flow. The main idea of the differential pressure flow meter is based on the Bernoulli equation. These achieved by measuring pressure drop signal as function of square flow speed. p1 + 1/2 ? v12 = p2 + 1/2 ? v22 The most common types of differential pressure flow meters are a- Orifice plate With the using of the orifice plate, the fluid flow is measured through the difference in pressure from the upstream side to the downstream side. As showing in figure 1 : this process used in case when dont needs for high accuracy. b- Venturi tube Its best used in our case because this apparatus used in case of low pressure drop between the inlet and the outlet of nozzle. In the venturi tube application the flow rate is measured by reducing the cross section flow area in the path of the fluid flow After the constricted area, the fluid passes through the pressure recovery section. When up to 80 % of the differential pressure generated at the constricted area, is recovered with proper instrument and flow calibrating. The venture tube flow can be less to about ten percentage of its full scale range with proper accuracy. c- Flow nozzle The flow nozzle are often used as measuring elements for gas flow application When the gas accelerated through the nozzle, the velocity increase and the pressure so the gas density decreased and the maximum velocity done in the throat section. Recovery of pressure drop in orifices , nozzles and venture meters After the pressure difference has been generated in the differential flow meter. The fluid passing during the pressure recovery section. By means where the differential pressure generated at the constricted area is partly recovered 2- Variable area flow meter The rotameter composed of an vertically glass tube with large end in the top section of the main body of the rotameter and metering float which it free move . when the fluid flow causes the float raise in the tube and apply the relation of Ά P = h * g * P Where Ά P =pressure difference between inlet and outlet H = float recording P = fluid density 3- Velocity flowmeters In this process the flow calculated by measuring the speed and calculate the pressure difference from the next relation p1 p2 = 1/2 p (v22- p v12 ) 4- Pitot tubes The pitot tube are one the most used in air flow measurement. The main idea for its operation is in measure the fluid velocity by converting the kinetic energy to potential energy. 5- Calorimetric flowmeter This device principle for fluid flow measurement is based on two temperature sensors in close contact with the fluid but thermal insulated from each other . one of the two sensors is contactly heated so there are temperature difference between the measurement of the two sensors . 5-turbine flowmeter 6-vortex flowmeter 7-electromagnetic flowmeter 8-ultrasonic Doppler flowmeter 9-positive displacement flowmeter 10-mass flowmeters 11-thermal flowmeter 12-open channel flowmeter Calorimetric operation theory The main idea for the operation theory of the calorimetric flowmeter based on measurements for the temperature before and after the nozzle by using two sensor and converting this difference to signal translated by the usage of the gauge indicators . When the fluid flow start passing into the nozzle the heat energy is drawn from the heated sensor and the temperature difference is directly proportional to the fluid flow rate through the nozzle Advantages and disadvantages of calorimetric flowmeter Advantages  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Disadvantages 1-high accuracy at minimum flow rate  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  1-costs 2- In general lower thermal conductivity require higher velocity for proper measurement.  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  2-appear cavitations in high speed 3-easy in its operation process  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  3-normally operates at low range 4-High repeatability  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  4-low noisy factor 5- high dynamic response  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  6-high sensitivity 7-small dimension ( portable ) Lab application Calorimetric provides two types of data. The first type is measurement of the heat capacities. This leads to values of the standard entropy St , the enthalpy ( or heat content ) HT- HS . And the enthalpies and the entropies of rapid phase changes (fusion, vaporization, polymorphism) of a single material. the second type of measurement of heats of chemical reaction ( formation from the elements or the oxides , relatively stability of competing phase assemblages , mixing in solid and liquids solutions ) either by direct reaction or through a thermchemical cycle such as is involved. Second application for the nozzle in the calorimeter is to spray the natural gas to burn it inside the combustion chamber. The next figure show example for burner nozzle. 1-Fuel properties and the effects of sprays Our fuel used in the calorimeter is the natural gas which takes the name of isooctane (C2H6) and it has the next microstructure Temperature The temperature difference between the inlet and the outlet of the nozzle also affecting on the nozzle performance this achieved by when the temperature increased this directly effecting on the fuel properties specially in its viscosity so in the petroleum applications for the high viscosity sometimes used heating process for the fuel before path through the nozzle . Surface Tension The Surface tension in natural is the tendency of the surface of the liquid to contracting with the smallest possible area. The effect is normally similar to the skin surrounding the body of the liquid and pulling it into the shape, which will have the least amount of the surface area. That shape is spherical shape. Surface tension Natural of flow The natural of fluid flow through the nozzle effect on its performance .for example in case of laminar flow the performance of the nozzle will be better than in case of turbulent flow. In case of found a head it also affect in the nozzle performance. Cleaning Nozzles In case of using fluids containing sluts and other dusts it concentrated in the main body of the nozzle which affect on the nozzle path that reduce the flow rate through the nozzle which affect on its performance . Spray Patterns The Nozzles used for oil burners are provided in two different general types of spray patterns, hollow cone and solid cone. These are illustrated in the below Figure. It will be noted in these illustrations that the hollow cone is a spray in which the concentration of droplets is at the outer edge of the spray with little or no fuel in the center of the spray versus the other type of sprays which leads to an weakness in the performance of the nozzle. Performance improvement The efficiency of the nozzle depending on several factors it concentrated on Type of sprayer and nozzle of design The percentage of air to fuel ratio Spark method from heaters to use the spark ignition technology. Percentage of carbon on the fuel So in the next section we discuss these factors which it can affect on the nozzle performance 1- Flammability ( burning start) The classical method for lighting the calorimeter is matching it is not efficient so that we improve the nozzle performance from this side by using the spark ignition technology. This spark ignition working depending on providing it with fixed voltage from battery to be able get the initial spark to start the burning process * The spark ignition which get the initial spark to the instrument get its power connected by wire (3mm ) which connected also to battery with 12 v . 2- Fuel to air ratio In the theory of the stoichiometric mixture has just enough air to completely burn burn the available fuel. In natural this is never quite achieved, due primarily to the very short time available in the internal combustion chamber for each combustion cycle. Most of this combustion process completes in approximately 4-5 milliseconds. This is the time that elapses from when the spark is fired until the burning process completed. The Air fuel ratio is the most common reference term used for mixtures in internal combustion engines It is the ratio between the mass of air and the mass of fuel in the fuel-air mix at any given moment For pure natural gas the stoichiometric mixture is approximately 14.7:1 or ? of 1.00 exactly 3-to make a window from the top to see the flame from inside instead of opening the system each time. We must use material Cleary to see out from it and work under pressure 10 bar {rm C_2H_6} + tfrac{7}{2}{rm O_2} rightarrow 2{rm CO_2} + 3{rm H_2O} Equivalent ratio The equivalence ratio of a system is defined as the ratio of the fuel-to-oxidizer ratio to the stoichiometric fuel-to-oxidizer ratio. Mathematically phi = frac{mbox{fuel-to-oxidizer ratio}}{(mbox{fuel-to-oxidizer ratio})_{st}} = frac{m_{fuel}/m_{ox}}{(m_{fuel}/m_{ox})_{st}} = frac{n_{fuel}/n_{ox}}{(n_{fuel}/n_{ox})_{st}} 4-carbon percentage in the fuel Natural gas is an extremely important source of energy for reducing pollution and maintaining a clean and healthy environment. In addition to being a domestically abundant and secure source of energy, the use of natural gas also offers a number of environmental benefits over other sources of energy, particularly other fossil fuels. This section will discuss the environmental effects of natural gas, in terms of emissions as well as the environmental impact of the natural gas industry itself. Scroll down, or click on the links below to be transported ahead. Conclusion The report is an investigation to describe the calorimeter process and the system operation with the nozzle performance and the method to improve its performance. So the main objectives from the report are To understand the basic principle of calorimeter and its necessity in engineering to investigate different types of calorimeters. The advantages and disadvantages using these calorimeters in the engineering lab environment. References 1- http://www.pro-techsolutionsltd.com/PDF/flownozzle.pdf 2- www.EngineeringToolBox.com 3- www.flowmeterdirectory.co.uk/flowmeter_calorimetric.html 4- www.webersensorsinc.com/glossary.html 5- S. Sosin, C. Moldovan, R. Iosub; Designing and manufacturing of a calorimetric micro-sensor for methane detection, CAS International Semiconductor Conference Proceedings, Vol. 2, 2004, pp. 381 384. 6- www.bioline.org.br/pdf?se08021 7-R. Mohan Kumar, R. Muraliddharan, D. Rajan Babu, K. V. Rajendiran, R. Jayavel, D. Jayaraman, and P.Ramasamy, J. Cryst. Growth 229, 568 (2001). 8-K. Meera, R. Muralidharan, R. Jeyavel, and P. Ramasamy, J. Cryst. Growth 263, 510 (2004).

J.M. Coetzee’s Disgrace: Post-Apartheid South Africa Essay -- South Afr

You behave as if everything I do is part of the story of your life. You are the main character; I am a minor character who doesn't make an appearance until half way through. Well, contrary to what you think, people are not divided into major and minor. I am not minor. I have a life of my own, just as important to me as yours is to you, and in my life I am the one who makes the decisions (Coetzee 174) This is a poignant statement made by Lucy Lurie to her father David the protagonist and central consciousness of Disgrace. It is her response to his lack of understanding her life choices and his lack of deep regard for anyone but himself. It is his handicap, his inability to understand anything outside of his self-reflections, and his attitude is due to a level of arrogance and sense of privilege, as he continues his attempts at self-elevation. Lucy is protesting his inability to understand her life choices and the root of his lack of any deep regard for anyone but himself. When David loses his position at the University through his own arrogance,--one reading of the â€Å"disgrace† of the title, whether he feels it as such or not,--his partly conscious and partly unconscious search for reconciliation forces him to listen to the voices of formerly silenced persons, feminine, and black represented in the just quoted passage by his daughter. David in his narration bends the scope of his story toward the plight of women, rather than the â€Å"colored† in a post-apartheid South African landscape. Lucy is a convenient representation for David of those really disgraced in post-Apartheid South Africa, while David represents those seemingly disgraced who evade the realities of their actions, those unapologetic un-remorseful masses that excuse ... ...t of vipers. No, Professor Lurie, you may be high and mighty and have all kinds of degrees, but if I was you I’d be very ashamed of myself, so help me God. If I’ve got hold of the wrong end of the stick, now is your chance to say, but I don’t think so, I can see it from your face.’ Lurie whispers in response, ‘excuse me, I have business to attend to and walks away (Coetzee 38) David’s response to Melanie’s father in the passage above only further demonstrates what is echoed throughout the text. His avoidance, self-righteousness and inability to apologize become apparent. In that scene at the beginning of the novel we see David’s ability to evade a clear transgression made by him when confronted, and therefore gives us a glimpse of the person we will be depending on to tell us the story. Works Cited Coetzee, J. M. (2000) Disgrace. London: Vintage.