Internal Combustion And Diesel Engines Engineering Essay

Internal Combustion And Diesel Engines Engineering Essay Since the time when the internal combustion engines were devised, it continued to develop as our cognition of engine processes has increased, as new engineerings became available, as demand for new types of engine arose, and as environmental constraints on engine apply changed. Internal combustion engine, and the industries that develop and manufacture them and support their use, now play a dominant role in the fields of power, propulsion, and energy. The last century has seen an explosive growth in engine research and development as the issues of air pollution, fuel cost. Market competitiveness has become increasingly important. John B. Heywood, Internal combustion engine fundamentals. 1988. The internal combustion engine is classed as spark-ignition engines, sometimes called Otto engines, or gasoline engines or petrol engines, though other fuels can be used, and compression ignition or diesel engines, because their manufacturing is not complex, these two types of engine have found wide application in transportation (land, sea, and air) and power generation. As one of the main components in an engine, pistons technological evolution is expected to continue and they are expected to be stronger, lighter, thinner and durable. The main reason of this continuous attempt of evolution is based on the fact that the piston may be regarded the heart of an engine. Internal combustion engines, dating back to 1876 , when developed the first Otto engine spark plugs, and 1892 when he invented the diesel engine, compression ignition. Internal combustion engine is the engine that fuel combustion occurs with an oxidizer (usually air) in the combustion chamber. In the expansion of the internal combustion engine at high temperature and pressure of the gases, this is being produced by combustion, and applies directly to a force transmitted from the engine, such as turbine blades or pistons and transmission distance, and the generation of useful mechanical energy. The longer the internal combustion engine usually refers to the combustion engine, which is intermittent, such as the more familiar four-stroke and two-stroke piston engines, along with variables, such as the Wankel rotary engine. A second category of internal combustion engines, the use of sustained combustion: gas turbines and jet engines, and most of the rocket engines, each one of which is internal combustion engines on the same principle as described earlier. Internal combustion engine (or ice) differs completely from the external combustion engines, such as steam or Stirling engines, which are delivered energy means of action does not consist of, or mixed with contaminated products of combustion. Factor may be liquids, air, hot water, water pressure or even sodium liquid, and hot some type of boilers from fossil fuels and nuclear energy for burning wood, and solar energy and to a large number of different designs for the International Exploration of the Sea have been developed and built, with a variety of different strengths and weaknesses. Powered by energy-intensive fuel (which is often the very means of gasoline derived from fossil fuels) ICE delivers power to weight ratio is excellent with few safety or other defects. While there were still many stationary applications, the true power of internal combustion engines in mobile applications, which controls the supp ly of energy for cars, planes and boats, from the smallest to the largest. Only to hand power tools it is not part of the market share with a battery-powered device. Engines can be classified in many different ways: By the engine cycle used, the layout of the engine, source of energy, the use of the engine, or by the cooling system employed. While there are many cut and dried reasons for aluminum piston failure can be attributed to the majority of a group of different circumstances. Air / fuel, coolant, and regulated the relationship between oil and the engine of the different temperature cylinder liner is critical to maintain the proper operation of all components of the cylinder. Can be for a variety of conditions cause excessive growth of the piston or melt, and lead all degrees, including the disastrous results in the engine malfunction . To redress the balance between the air fuel ratio of the engine is the most important for longevity piston, durability and proper process engine. The combination of a lot of fuel or air very few have the same result the growth of thermal erosion of the piston crown. This can be attributed to the blockage of the air intakes, restricted exhaust, turbo malfunction, fuel pump is incorrect and the contamination of the injector calibration, and of course, injection or the timing of the e ngine Diesel engine has a long history that is intertwined closely with economic and other issues at the time. Diesel engine was created by Rudolf Diesel. He developed the idea of diesel engines and thought up the principle of its work. He believed even the notion of the engine that compresses air to the point where there is a rise in temperature produced. The concept of a principle where the air when entering the room with the piston, burning in the air as a result of rising temperatures. This causes the piston to move down and eliminates the need for a source of ignition. When Diesel designed his engine, while there was a demand for more fuel efficient engine, as the steam engine was nowhere close to efficient Diesel engine does not need to water supplies or large for a long time warming up and high efficiency in converting thermal energy to work. Used widely in both fixed and mobile diesel where the facilities of the power required is between that provided by a gasoline engine and that of steam turbines, and where can be written relatively high cost of the initial off over a long period. For example, a diesel capacity from 100 to 5,000 horsepower and running on generators and industrial, municipal and the pumps that operate constantly (for example, on oil pipelines). Furthermore, they occupy a relatively small area compared with steam units, because there is a need for a boiler, a factor of importance on board ship. Diesel engine differs from a gasoline engine, the fuel is the cause of the blaze by air pressure in the cylinders instead of a spark: a high compression ratio allows the air in the cylinder to become hot enough to ignite the fuel. Due to the high temperatures of the process, it must be water-cooled diesel engine. Build a diesel engine is heavier than that of the gasoline engine, and there are usually three or more cylinders (supported in the framework of the board) and heavy flywheel. The cylinders work alternately to give the effect a smooth transition, and also contribute to the flywheel to ensure a smooth work. There are two types of diesel engines. In the two-stroke -or two-cycle- type there is as a full course of the process in each of two stroke piston. This type of engine requires the provision of compressed air to run and start. In four- stroke, or four cycle- type the first downstroke of the piston draws in air that is compressed to rub up to around ÂÂ £ 500 square meters for each guest (35 kg per square cm). In the upper part of the stroke plane of the oil is sprayed in the way of fuel injector. And ignited the oil and the rapid expansion of gas created by the explosion forces the piston down in the work, or fire, and stroke. And after rubbing the top of the waste gas through the exhaust valve, and a complete cycle. The speed and power of the diesel are controlled by varying the amount of fuel injected into the cylinder, not the amount of air admitted as in the gasoline engine. Small and medium-size ships may have several diesels producing as much as 50,000 hp. Heavy-duty land transports such as trains, trucks, buses, and tractors are often diesel-powered. Some automobiles and even some airplanes have had diesel engines. Diesel engines, although more fuel efficient than gasoline engines, and generate more smog combustion products produced for (though it produces greenhouse gases, global warming less). This has restricted the sale of diesel-powered vehicles in states such as California, where smog has been a significant problem. The effects of the introduction of diesel fuel is very low sulfur in 2006, which was conducted in part to encourage the development of emission control technology and improved diesel engines, and the development of cleaner diesel engines for cars burning. And new rules for diesel engines in 2009 are required to comply with the standards set for emissions of gasoline engines

India’s First Five Year Plan Essay

At the time of India’s first Five Year Plan, the government focused primarily on the agriculture sector. A large part of capital and technology was devoted to increasing agricultural production. This was effective at the time and is now referred to as the green revolution. The success of this plan convinced the Indian Planning Commission to shift their strategy. The NM strategy drew inspiration from the USSR and suddenly focused on rapid industrialisation in the second Five Year Plan rather than the agricultural sector as they had done in the previous plan. The NM strategy focused on industrialisation, mostly on the idea that manufacturing industries enjoy economies of scale, while agricultural production would face secularly diminishing returns. The productivity of labour could also be increased in capital intensive manufacturing industries while the surplus gained per labourer from agricultural production would be lower. Therefore, the available quotient for re-investment and the resultant growth would be higher from basic and heavy capital industries. Major developed capitalist countries like Japan, the U.S.A and the U.K took an alternate path to industrialisation called the â€Å"demand-pull† process. This involves starting with establishing consumer good industries, intermediate good industries and light engineering industries to supply simple materials and equipment to the consumer good industries. Agricultural development would lead to the growth of consumption good industries that supply basic consumption needs such as food and clothing and this in turn would lead to growth in agriculture. Under this system, even small increases in capital invested in agriculture would increase output and employment as opposed to the large amount of investment required for setting up heavy capital industries. This increase in agricultural growth would enhance the demand for consumer goods and gradually, basic and heavy capital industries would emerge. This path ensures a self-financing system without inflationary  pressures, as profits generated in the consumer goods industries would be re-invested in infrastructural industries. This could have been highly advantageous. The booming population in India, i.e. the growing labour force in the country was not accounted for due to the nature of capital-intensive industries. The growth of the basic and heavy capital goods industries did not increase the supply of essential consumption goods for an increasingly poverty ridden population. The large investment in infrastructural industries led to an increase in monetary demand and the slow growth in the supply of consumption goods could not match it. This led to growing inflationary pressures. In order to control the flow of private investment, policy makers implemented a system of licenses to ration industrial capacity between the existing firms. Therefore, private investment was not profitable and thus, efficiency, product innovations, technological advancements and competitive pricing were foregone. It can be seen that the fundamental problems of poverty and unemployment faced by India were not addressed by the N-M strategy. The neglect of agriculture can be seen from the allocation of the total outlay that was given to this sector in the Five Year Plans that followed the first one. Only large irrigation projects were financed and therefore the vast majority of small, marginal and subsistence farmers were neglected. The protection that these industries were given from foreign competition made India a high cost and technologically stagnant economy. In conclusion, it can be seen that only 25% of the plan expenditure was directed towards the rural economy which comprised 70% of the labour force of the country. Government employees and white and blue collar employees of public and private large-scale industries were the only people who benefited from the strategy.

Introduction to Practical Life Essay

* The purpose of Practical Life is to help the child gain control in the coordination of his movement, especially development of the hand`s coordination. â€Å"The hands are the instruments of man’s intelligence†. Maria Montessori- The Absorbent Mind. The fine muscles coordination is closed connected with the child`s conceptual development. As Dr. Montessori quoted it: â€Å"The human hand allows the mind to reveal itself†. Practical Life activities help the child to gain independence and enables him to correlate his own physical, psychic and moral desires: * Physical desire to move and exercise growing limbs * Psychic – to perfect the movements Moral – to become useful and helpful to the other. The area of Practical Life aids the growth and development of the child’s intellect and concentration and will in turn also help the child develop an orderly way of thinking. In addition, Practical Life initiates in the child respect and love for any work, steps for creative art and helps the child to perform the activities of daily life with joy, skill, and grace through which he is attaining perfection. In an ideal situation, Practical Life would be located near the entrance to the classroom, as a link between home and school and a basis for the curriculum. Beautiful area: color coded, beautiful flowers, paintings, vases†¦ to draw child to Practical Life. Concentration: The child will be given uninterrupted work time to help him to develop the ability to concentrate and an opportunity to develop good work habits. He/she will learn to observe, organize, analyze, and problem solve. Concentration leads to normalization, enables the child to focus on work, and increases his attention span. The child who laboriously scrubs a table and attends to the details of their work is laying the foundation for calm effortless concentration levels for creative thought patterns. Coordination: The child will be encouraged to develop and refine large and small muscle control. He/she will be given the opportunity to coordinate bodily movements. Eye-hand coordination will be a major goal in many activities. Attention to movement is not instinctive but planned voluntary actions. Repetition provides the child with opportunities for perfecting these movements. Independence; The children will develop independence through the mastery of themselves and their environment. The skills learned in Practical Life serve as preparation for success in all other areas of the classroom. We all want to be masters of our own fate. The independent activities we adults take for granted are major hurdles in the child’s drive for independence. Order: The Montessori classroom provides the child with real and purposeful work. The environment helps the child to develop a sense of Order. The internal Order is absorbed and learned from the external order. Sequential steps in the work expand the child`s memory. Dr. Montessori observed that children need order at a specific sensitive period in their development. If not provided during this period the opportunity is foregone. The child is systematically categorizing their world. Thus, a routine is very important as well as a place for everything and everything in its place. A sense of calm provides the child an opportunity for orderly self construction. A Positive Self-Concept and Self-Confidence: A child who can do for himself and help others has a good self-concept. The interest work, consistent classroom rules, and respectful teacher responses help the child develop inner discipline and self-control. Practical Life activities encourage the child to develop effective socialization skills. He learns to contribute to the class community and to build friendships. On the other hand, the indirect aim of Practical Life is to develop the child`s fine motor movement, which involves the body, intellect and will. These indirect aims are, for example, eye-hand coordination, pincer grip, whole hand grasp, preparation for writing, exercise and co-ordinate body movement. Movement is so important for the young children; children need to move. â€Å"Through Movement, he acts upon his external environment and thus carries out his own personal mission in the world. Movement is not only an impression of the ego but it is an indispensable factor in the development of consciousness, since it is the only real means which places the ego in a clearly defined relationship with external reality. † Maria Montessori, The Secret of Childhood, New York Ballantine Books, 1966. Dr. Montessori believed that the Prepared Environment was integral to a child`s development. The Montessori classroom is a child-centered community, designed to facilitate maximum independent learning and exploration. Here, the child experiences the blend of freedom and discipline to act and develop along the lines of his own nner direction- physically, mentally and spiritually. In the Prepared Environment there is a variety of activity as well as a great deal of movement. No object is taught in isolation; the work is interdisciplinary and interactive. The prepared environment has seven basic components: 1) Freedom: within limits, freedom to say â€Å"no thank you†, freedom to talk, to choose, of movement, to be alone, to be with friends. 2) Structure and order: Inherent in environment; fully arranged and proportioned for the child and divide into various areas such as Practical Life, Sensorial, Math, Language, etc. in shelving: left to right, simple to complex, within the tray, etc. ; routine of day. 3) Reality and nature: plants, animals, natural containers. 4) Beauty and atmosphere: calm, beautiful filled with nature. 5) Montessori materials: basis of methodology. 6) Development of community life: part of a group, interacting with others in a peaceful manner, taking responsibility for themselves and each other, respecting each other`s differences, abilities, work and work space, and to treat each other with courtesy and dignity. ) Teacher: children can function independently, if just for a moment. Montessori triad: teacher, child, prepared environment. The classroom needs to be prepared to meet the child`s needs: psychic space which should be clean, uncluttered; small nooks for privacy; must provide space for movement; teacher`s role is to create activities that will be self-teaching for the children (control of error: like using wood before glass); set up for success. In a Prepared Environment, you would notice three main guiding ground rules: respect for self, for others and for the environment. All practical Life Activities are directed to these ground rules; therefore, the numbers of rules should be kept to a minimum, likewise, concise and easy to understand and presented in a positive manner. These ground rules are the criteria needed to maintain freedom for self as well as for others. They promote freedom through independence. In a Montessori classroom, the Practical Life lessons provide to the three year olds the opportunity to spend most of the time to develop skills, concentration, order, and coordination. They prefer to help adults with their activities. They want to use real tools, such as brooms, sponges, brushes, screw drivers, cleaning rags, and other such items. Four years olds will refine their skills and five year olds will be to perfect all the skills learned. Older children are generally in favor for more elaborate activities such as cooking and cross stitching.

Symbolic Imagery in Langston Hughes Poems, The Negro...

Symbolic Imagery in Langston Hughes Poems, The Negro Speaks of Rivers and Mother To Son Langston Hughes uses symbolism throughout his poetry. In the poems The Negro Speaks of Rivers and Mother To Son, Langston Hughes uses symbolism to convey his meaning of the poems to the readers. Readers may make many interpretations about the symbols used throughout these poems. Throughout the poem The Negro Speaks of Rivers Hughes uses metaphorical statements to suggest to the reader what the soul of the African American has been through. The symbols of the old rivers, from which the African American ideal has risen, can be interpreted in many different ways. They can represent the birth and growth of the African American†¦show more content†¦In the fourth line of the poem Hughes speaks of the Euphrates River. This river symbolizes the birth of life and the beginning of civilization to many readers. This river can represent the youth of the African American people. It speaks of the beginning of life and culture. Then Hughes talks of the Congo River in Africa. This is an image of home for many African Americans. It represents a place of peace and tranquility in their lives. The speaker of the poem goes on to say how the Congo lulled me to sleep (5), which further brings the image of a tranquil scene to mind. Hughes also writes about the Nile River and the great pyramids in Egypt in this poem. To some readers the pyramids can be viewed as a symbol of slavery of the African American people due to the slave labor that it took to create these grand structures. Finally the great Mississippi River is written about. Many symbols arise from this river of the South. To many whites it represents prosperity, especially in the time of the Civil War when slave trade was one of the bases of economy; however, to many African Americans this river may be a symbol of the oppression of their people. The image of Abe Lincoln riding down the Mississippi can be seen as a symbol of hope and freedom to the slaves of the South. The very fact that Lincoln is on the Mississippi river, which can represent early slavery, shows theShow MoreRelatedWhat Qualities That Make A Langston Hughes Work Memorable And Timeless2528 Words   |  11 Pages There are certain qualities that make a Langston Hughes’ work memorable and timeless. Whether it is the topics that choose to write about or types of characters he chose to portray. Imagery provides the reader with a visual picture of what the writer is trying to convey, rhythm gives the story its beat, and the metaphor gives the work its deeper meaning. All three components can always be found in a Langston Hughes piece. Most of my own poems are racial in theme and treatment, derived from