The Steam Turbine Technology Engineering Essay

The Steam Turbine Technology Engineering Essay Steam turbine technology is the almost all of electricity generation power plants from biomass used power generation in the world at present. This technology is well established due to availability of cheap or waste biomass in the world. As an example, USA has the installed capacity of electricity generation from biomass around 7000 MW with efficiency of 20 to 25 percent. The biomass Boiler steam turbine systems are expected to find more applications for electricity generation in the future, particularly in situations where cheap biomass, e.g. agro industrial residues, and waste wood, are available. On the technology side, efficiency of these systems is expected to improve through incorporation of biomass dryers, where applicable, and larger plant sizes as well as higher steam conditions. The steam boiler turbine arrangement, woody biomass is combusted in a furnace of a steam boiler with fluidized bed combustion. Heat released during combustion is utilized to raise high pressure and high temperature steam. This steam is expanded through steam turbine, which in turn drives an electric alternator. Exhaust steam from the turbine is condensed and returned to the boiler. Wood fuel is usually shredded to appropriate size and dried utilizing a part of the flue gas, before the fuel introduced into the furnace. This technology has been in existence in many parts of the world, specifically to produce electricity and motive power in the sugar industry utilising bagasse (residue produced after crushing sugar cane) as the fuel. In this modern version of this technology, wood fuel is shredded into very small pieces and combustion is carried out in a fluidised state. Although this improvement increases the cost of fuel preparation and air supply, it improves the combustion efficiency, thus reducing the operational costs and also reducing stack emission levels. A fluidized bed boiler could accept not only chipped wood but also residues such as rice husk, sawdust etc. This technology is widely used all over the world to generate electrical and motive power from solid fuel. The modern versions have incorporated many new features to improve operational efficiency, thus reducing cost of operation and to reduce emission levels. Some of these improvements are: Increasing the pressure of boiler, increasing the vacuum in the condenser, combustion air pre heating and steam reheating. Figure 11 schematically shows the principle of this conventional system Condenser Flue Gas Figure 11: Boiler-steam turbine system Cogeneration Cogeneration is the process of producing two useful forms of energy, normally electricity and heat, utilizing the same fuel source in an industrial plant where both heat/steam and electricity are needed, these requirements are normally met by using either; 1) Plant-made steam and purchased electricity, or 2) Steam and electricity produced in the plant in a cogeneration system. The second option results in significantly less overall fuel requirement. Steam turbine based cogeneration is normally feasible if electricity requirement is above 500 kW. Biomass based cogeneration is often employed for industrial and district heating applications; however, the district heating option would not be applicable in the tropical countries. A number of studies have been carried out on cogeneration in different agro industries, particularly, sugar mills and rice mills. These show that biomass based cogeneration technology is well established in the pulp and paper industry, plywood industry as well as a number of agro-industries, for example, sugar mills and palm oil mills. Normally, there is substantial scope for efficiency improvements in such cases. For example, bagasse is burnt inefficiently in sugar mills in most developing countries because of a number of reasons, e.g., old and obsolete machinery, disposal problems created by surplus bagasse, lack of incentive for eff icient operation etc. Improving the efficiency of biomass-based cogeneration can result in significant surplus power generation capacity in wood- and agro-processing industries; in turn, this can play an important role in meeting the growing electricity demand in developing countries. India has launched an ambitious biomass based cogeneration programme. A surplus power generating capacity of 222 MW was already commissioned by the end of 1999, while a number of projects of total capacity 218 MW were under construction. The total potential of surplus power generation in the 430 sugar mills of the country has been estimated to be 3500 MW. Co-firing Co-firing is set up as an auxiliary firing with biomass energy source in coal fired boilers. The co-firing has been tested in pulverized coal (PC) boilers, coal-fired cyclone boilers, fluidized-bed boilers, and spreader stokers. Due to fuel flexibility of fluidized bed combustion technology, it is currently the dominant technology for co-firing biomass with coal. Co-firing can be done either by blending biomass with coal or by feeding coal and biomass separately and is a near term low-cost option for the efficient use of biomass. Co-firing has been extensively demonstrated in several utility plants, particularly in USA and Europe. Co-firing represents a relatively easy option for introducing biomass energy in large energy systems. Besides low cost, the overall efficiency with which biomass is utilized in co-firing in large high pressure boilers is also high. Current wood production systems in most countries are dispersed and normally can only support relatively small energy plants of capacity up to 5-20 MWe, although dedicated plantations can probably support much bigger plants in the future. Thus, biomass supply constraint also favour co-firing biomass with coal (with only a part of the total energy coming from biomass) in existing co-fired plants in the short term. Whole Tree Energy (WTE) system: The Whole Tree Energy (WTE) system is a special type of wood fired system, in which whole tree trunks, cut to about 25 ft long pieces, are utilized in the process of power generation in an innovative steam turbine technology that uses an integral fuel drying process. Flue gas is used to dry the wood stacked for about 30 days before it is conveyed to a boiler and burnt. Allowing the waste heat to dry the wet whole tree can result in improvement in furnace efficiency with net plant efficiency reaching comparable value of modern coal fired plants. Stirling Engine A Stirling engine is an external combustion engine; working on the principle of the Stirling thermodynamic cycle, the engine converts external heat from any suitable source, e.g. solar energy or combustion of fuels (biomass, coal, natural gas etc.) into power. These engines may be used to produce power in the range from 100 watts to several hundred kilowatts. Stirling engines can also be used for cogeneration by utilizing the rejected heat for space or water heating, or absorption cooling. A number of research institutes and manufacturers are currently engaged in developing biomass fired Stirling engine systems. For example, the Technical University of Denmark is developing medium and large Stirling engines fuelled by biomass. For 36 kWe and 150 kWe systems, the overall efficiency is about 20 percent and 25 per cent respectively. [..] Gasification Gasification is the process of converting a solid fuel to a combustible gas by supplying a restricted amount of oxygen, either pure or from air. The major types of biomass gasifiers are, Fixed bed gasifier, Fluidized bed gasifier, and Biomass integrated gasification combined cycles (BIGCC) Fixed Bed Gasification Fixed bed gasification technology is more than a century old and use of such gasifiers for operating engines was established by 1900. During World War II, more than one million gasifiers were in use for operating trucks, buses, taxis, boats, trains etc in different parts of the world. Currently, fixed bed gasification shows for the most part possible selection into biomass based power generation with capacity up to 500 kW. Although charcoal gasification presents no particular operational problem, the actual acceptance of the technology by potential users is rather insignificant at present, mostly because of low or no cost benefit that it offers. Also, producer gas is less convenient as an engine fuel compared with gasoline or diesel and the user has to have time and skill for maintaining the gasifiers-engine system. However in situations of chronic scarcity of liquid fuels, charcoal Gasifier-engine systems appear to be acceptable for generating power for vital applications. Thus, sev eral gasoline-fueled passenger buses converted to operate with charcoal gasifiers were reported to be in use in at least one province of Vietnam in early 1990s. As reported by Stassen (1993), a number of commercial charcoal Gasifier-engine systems have been installed since early eighties in the South American countries. Wood gasification for industrial heat applications, although not practiced widely, is normally economically viable if cheap wood/wood waste is available. On the other hand, wood gasifiers-engine systems, if not designed properly, may face a wide range of technical problems and may not be commercially viable. Research and development efforts of recent years have been directed towards developing reliable gasifier-engine systems and the technology appears to be maturing fast. Although the demand for wood gasifiers is rather limited at present, a number of gasifier manufacturers appear to have products to offer in the international market. Gasification of rice husk, whic h is generated in rice mills where a demand for mechanical/electrical power also exists, has attracted a great deal of interest in recent years. The rice husk gasifier design that has found quite wide acceptance is the so-called Open Core design that originated in China; this is basically a constant diameter, (i.e. throttles) downdraft design with air entering from the top. The main components of the gasifier are an inner chamber over a rotating grate, a water-jacketed outer chamber and a water seal-cum ash-settling tank. Gasification takes place inside the inner chamber. The char removed by the grate from inside the gasifier settles at the bottom of the water tank. At present, 120 to 150 rice husk gasifiers appear to be in operation in China. A third of the gasifiers are in Jiangsu Province; these include about thirty 160 kW systems and about ten 200 kW systems. A number of rice husk gasifier systems have been shipped to other countries namely, Mali, Suriname, and Myanmar. A husk g asifier system of capacity 60 kW was developed in 1980s to use in smaller mills in the developing countries. This prototype was successfully used in a mill in China, although no other such unit appears to have been built or used. Beside rice husk gasifiers, several other gasifier models have also been developed in China. Presently, more than 700 gasification plants are operating in China (Qingyu and Yuan Bin, 1997). As a result of several promotional incentives and RD support provided by the government, gasification technology has made significant progress in India in the recent years. Up to 1995-96 about 1750 gasifier systems (Khandelwal, 1996) of various models were installed in the different parts of India. The total installed capacity of biomass gasifier system in India by 1999 is estimated to be 34 MW. Besides generating electricity for the local community, it is estimated that the project has also benefited about 11,000 people directly or indirectly. Fluidized Bed Gasification Fluidized bed gasifiers are flexible in terms of fuel requirements, i.e. these can operate on a wide range of fuels so long as these are sized suitably. However, because of complexity in terms of manufacturing, controls, fuel preparation and operation, these gasifiers can only be used for applications of larger capacities compared with fixed bed gasifiers, typically above 2.5 MW. Biomass integrated gasification combined cycle (BIGCC) technology In the gasification gas turbine technology described above, an overall maximum efficiency attainable is 20%. This could be substantially improved, by raising steam utilizing the gas turbine exhaust and driving a steam turbine. A number of BIGCC power plants are in operation in countries such as Sweden and Finland. Gasifier-internal combustion (IC) engine technology In this arrangement, solid wood is first dried and shredded into appropriate size and then converted into a combustible gas in a gasifier. Gasifier is a cylindrical reactor with a throat section, which is narrower than the rest of the reactor. In this throat section, air is introduced through a set of tubes. Wood dried to a maximum of 20% moisture level and shredded into appropriate sizes is introduced at the top of the reactor through an air lock. Up draught gasifiers are widely used for heat applications as they are easier to construct and are more energetically efficient. Such gasifiers are rarely used for motive power or electricity generation purposes due high tar levels in the gas stream. Wood Gasifier Gas Cleaning IC Engine Generator Gas Gas Exhaust Electricity Chart 01: Gasifier-Gas Cleaning-Engine System As the material slowly passes through the reactor, it undergoes physical and chemical changes in the many overlapping zones. First the material is dried in the drying zone, losing all the remaining water. Then the material is pyrolysed into solid char and volatiles. In the next zone the combustion or oxidation zone at the throat of the gasifier, all the volatiles get combusted into carbon dioxide and water. This section liberates all the heat required for the gasification process. In the expanding section below the throat section known as the reduction zone carbon dioxide and steam produced in the upper sections are made to react with carbon, which has reached red-hot stage. In this reduction zone, carbon dioxide and water reacts with carbon to form carbon monoxide, hydrogen, methane and other hydrocarbon mixtures. The oxidation is essentially an exothermic process liberating heat in the action, whereas the reduction zone is an endothermic process making use of heat. The gas mixture so produced is called producer gas. Un-burnt materials in the wood end up as ash and are collected and periodically removed from the bottom. Hot producer gas leaves the gasifier at the bottom of the gasifier under the action of an induced draft fan. Air for combustion in the combustion zone is drawn into the section due to low pressure created under the action of the induced draft fan. Producer gas leaving the gasifier, if mixed with air can form a combustible mixture. It can be used as a fuel in internal combustion (IC) engines or in furnaces or boilers. To be used in IC engines, the gas needs to be treated further. First it must be cooled to improve the volumetric efficiency (to facilitate the introduction of maximum quantity of fuel into the cylinders of the engine). This is done by a jet of water. The water jet also washes away a part of the tar and particulates in the gas. Then the gas needs to be thoroughly cleaned of all traces of tar and particulate matter. This is achieved by passing the gas through a series of filters. If the gas is to be used as fuel in a furnace or a boiler, the cooling and filtering operations may be omitted. If the gas is to be used as fuel for IC engine, then the gas mixed in the correct proportion of air is admitted to inlet manifold. In respect of spark ignition type of IC engines (petrol or natural gas engines), producer gas alone can operate such engines. For compression- ignition type of engines (diesel engines), it is necessary to utilise a minimum quantity (less than 5%) diesel fuel as the ignition source in a well optimised engine. When standard IC engines are fuelled with producer gas, the maximum output of the engine gets de-rated. In respect of spark ignition engines, this de-rating is about 50% (i.e. the new output is 50% of the name plate output). In respect of compression ignition engines, it is insignificant if 30% diesel fuel is used as pilot fuel. This technology to use producer gas from biomass fuel was popularised during the Second World War in the 1940s. During this war, distribution of petroleum fuel was disrupted and was in short supply. Many countries, particularly, USA and Sweden utilised this technology for transport vehicles. With the end of the war, the supply of petroleum was restored and this technology was discontinued. With the increase in cost of petroleum in the 1970s with the formation of OPEC, this technology has once again gained popularity, particularly for off-grid application for decentralised electricity production. In many Asian countries such as India, Cambodia and Sri Lanka this technology is becoming very popular for off-grid applications. In Sri Lanka, this technology was used prior to the introduction of Grid Electricity. In the earlier version, coconut shell charcoal was used as the fuel for the gasifiers. Producer gas from these gasifiers was used to drive slow-speed IC engines. Motive power of the engine was used to drive a single over-head shaft with multiple pulleys driving individual drives. Later, the IC engines were fuelled with furnace oil with injectors and hot bulb. When grid electricity was popularised, these devices were discontinued. At the Government Factory at Kollonnawa, near Colombo, remnants of this system are still available to see. With the increase in oil prices in the 1970s, interests in new and renewable energy resources surfaced again. A few gasifiers with IC engines were introduced through donor-funded projects. Attempts were made by many research institutions to develop this technology locally. These attempts were successful in varying degrees. With the declining oil prices in the late 1980s, the enthusiasm shown in renewable energy declined. Almost all the gasifiers system in the country became inoperative. Three years ago, a team of officials visited India to identify gasifier-IC engine systems for local adaptation. Later a 35kWe system was introduced from India by the Ministry of Science and Technology. For the past two years, this has been operating as a demonstrating unit for off-grid electricity generation. This system will be relocated to a rural area shortly to serve an isolated village community. The 35kWe system consumes 1.6 to 1.8 kg wood per kWh of net electricity generated. Figure 12 below shows a photograph of this system in operation. Figure 12: 35 kW gasifier-IC engine generator Gasifier-gas Turbine Technology The gasifier-IC engine system described in the previous section is more suitable for outputs in the kW to say 1 MW range. To use gasifier system for larger applications in the multiple MW range, gas turbine technology is generally more suitable. A schematic diagram of this technology is shown in 13. Gasifier Biomass Clean-up Flue Gas Gas Turbine Air Ash Figure 13: Gasifier gas turbine technology Biomass integrated gasification steam injected gas turbine (BIG/STIG) technology Gasifier Biomass Clean-up Flue Gas Steam Turbine Condenser Gas Turbine Air Ash A method of improving the efficiency and output of the above-described BIGCC technology is to inject steam into the gas turbine combustor. This increases the output of the gas turbine without consuming power at the compressor. This technology requires very stringent water purification system and other control measures. At this early stage of biomass technology for power generation in Sri Lanka, such complicated technologies are not considered. Figure 19 illustrates this principle. Figure 14: Biomass integrated gasification steam injected gas turbine (BIG/STIG) technology 4.7 Conclusions Table03: Typical capacity/efficiency/resource data for biomass power systems System Power kW* Energy efficiency % Biomass dm tonnes/yr ** Comments Small down draft gasifier/IC engine 10 15 74 High operation maintenance, and/or low availability, low cost Large down draft gasifier/IC engine 100 25 442 High operation maintenance, and/or low availability, low cost Stirling Engine 35 20 177 Potential good availability, under development, high cost Steam Engine 100 6 1840 Good reliability, high cost Indirect-fired gas turbine 200 20 1104 Not available commercially Pyrolysis/IC engine 300 28 1183 Under development Rankine Organic Cycle 1000 18 6133 Commercial Updraft gasifier/IC engine 2000 28 7886 Commercial Fixed grate or fluid bed boiler/steam turbine 2000 18 12270 Commercial Fluid bed (BIG/CC) à ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬ dedicated biomass 8,000 + 28 29710 Demonstrated Fluid bed gasifier co-fired 10,000+ 35 31500 Commercial Notes:- * Indicative of range for application ** Assumes: availability at 70%, fuel net calorific value 20 MJ/kg

F.I.T.T for Life

The F. I. T. T Principle: Frequency: The frequency of exercising must allow the body to adapt but rest and repair at the same time. For Cardio Repertory the recommended frequency is three times minimally a week and five to six times a week at most. Intensity: The intensity principle defines how much effort should be in one training session or in the training program. To make this principle effective there should be enough effort to overload the body to allow it to adapt but not as much as to over-train the body.Type: The Type of exercise you do depends on the outcomes you would like to achieve from you r program. There are 6 different types of training. These include fartlek, interval, continuous, circuit, weight and cross. Each has its own advantages and disadvantages. Time: Time outlines the amount of time spent on each session of training within your program. Time is based on the type of exercise and the intensity. Delete text and place photo here. Year 9 Year 9 Personal Health An d Development Assignment Part A: Research Task Play For Life * Recovery time improves Results appear in a shorter time period * Disadvantages * Strenuous on your body and easy to over train * Knee or leg problems can cause difficulty speeding up between intervals. Continuous: Continuous training improves aerobic fitness and is recommended for people who have not trained for a long time. It is moderate exercise lasting for at least 15-20 minutes without rest. AN overload is achieved by increasing intensity, time and speed. * Advantages * Improves aerobic fitness * Cheap * Can be done Individually or in a group * Range of activities can be used Easy to apply F. I. T. T principle PDHPE Year 9 Delete text and place photo here. Delete text and place photo here. Interval Training Fartlek Training Fartlek: The word ‘Fartlek’ come from the Swedish definition of speed play. It combines low and high intensity and many changes in speed and terrain. * Advantages * Improves speed an d endurance * Can be done over a variety of terrain * Can include hill work and reps * Programs can be flexible * Suits game players * Disadvantages * If you are not trained can create problems such as cramps * Lack of motivation to do your best Can be too easy to skip the hard bits * Difficult to see how hard someone is training Interval: Interval training consists of periods of hard work followed by periods of rest. It improves mainly speed and is done at high intensity at a fast pace. * Advantages * Fitness and performance improves quickly Part A: Research Task Circuit, Weight and Continuous Cross training contains a number of different training methods. It is used for most sports. * Advantages * Allows for a variety of training * Makes training more interesting Training can be adapted to suit the weather * Disadvantages * Spending time on different types of exercises can distract you from the more important ones * There will be more exercises you might want and need to do. * Dis advantages * Doesn’t improve anaerobic fitness so isn’t ideal for team games which require short bursts of speed * Can be Boring Circuit: Circuit training contains 6-10 training sessions at which a particular activity is performed * Advantages * Not much equipment is needed * Fitness and skills * Can be done at home or at the gym Disadvantages * Your program may include equipment you don’t have * Takes time to set up circuit Weight: Weight training is used to increase muscular strength, endurance and speed. It improves bulk and can help you recover after an injury * Advantages * Is easy to monitor improvement and overload * Can use a variety of exercises to work on certain muscular groups * Disadvantages * Muscles can be sore after workout * Can be painful to do Re. PDHPE Year 9 Delete text and place photo here. Cross Training Cross Training PDHPE YEAR 9 Michaela Franz

Family Factors That Influence Students’ Behavior in School

The traditional family structure has changed over the years because of divorce, single parent homes, two-career families and financial hardship. In an unstable environment, a child may act out causing disruptive behavior in school. School personnel deal with each student on an individual basis to figure out what factors are influencing their disruptive behavior. It is worthy to note, family factors attribute to a broad spectrum of negative student behavior in school. Sponsored Link Free online learning Inspiring new ways to teach your students STEMFamily DynamicsThe first teacher in every child's life is his parent. Studies indicate that parental expectations towards education is evident in a child's behavior. This is true no matter the type of family dynamics. Children with parents who nurture learning in a positive encouraging way have a better chance of succeeding in school. Too much encouragement or a parent with a negative, non-caring attitude towards learning may lead to an und ue pressure on the child causing anxiety, stress, underachievement and rebellion. Divorce It is not uncommon for children in a divorce situation to have behavioral issues in school.Divorce causes distress within a child. Their mind wanders and worries about the divorce situation. Guilt, feelings of loss, dislike of a parent or parents within the divorce situation may cause a child's mind to wander during school hours. Possible behavioral issues include aggression, loss of friends, isolation, intolerance for authority, and lack of tenacity to complete assignments. Financial Hardship The socio-economic status of a family plays a role in a student's behavior. There are numerous educational advantages for children from well-to-do families, even though they may have behavioral issues in school.It is, however, more likely that a child who lives in poverty or in the lower end of the middle-class will repeat a grade, be suspended or may be expelled or drop out from school. Violence and Abus e The National School Safety and Security Services states children who come from abusive homes harbor violent tendencies. Violence or mental abuse between parents or between parent to child manifests within a child to create a fearful environment. The child learns that violence or mental abuse is the answer to numerous situations, and may cause aggressive, disruptive and violent actions within the school system.Children exposed to sexual abuse and those that have been sexually abused may resort to sexual acts at an early age or they may attempt to force sexual acts on others. How Can Behavior Affect Academics for Students? Academic achievement isn't always an absolute measure of a student's intelligence. Instead, a variety of factors, such as teacher involvement, parental investment, school quality and student motivation, can affect academic life. Student behavior also plays a major role in academic achievement. A student's behavior can affect her ability to learn as well as other s tudents' learning environment.Sponsored Link Free online learning Inspiring new ways to teach your studentsDisruptive BehaviorStudents who behave disruptively by bullying other students, talking during lectures or by requiring the teacher to interrupt lessons to discipline them can have a negative effect on an entire classroom. A 2010 study published in â€Å"American Economic Journal: Applied Economics† found that disruptive students can lower the test scores and academic achievement of an entire classroom.Teachers who have disruptive students in their classroom may have to spend additional time on behavioral management, reducing the time the teachers spend teaching. Impulse Control Neurologists Sam Wang and Sandra Aamodt argue in their book â€Å"Welcome to Your Child's Brain† that impulse control is one of the most significant factors predicting academic success. Students with poor impulse control have more difficulty motivating themselves to study, do homework and listen in class. This can decrease their ability to excel academically, even when they perform well on IQ and achievement tests.Wang and Aamodt emphasize that rule-setting and teaching frustration tolerance play critical roles in helping children develop impulse control. Student Motivation Even the best teachers can't force a student to learn if the student is completely unmotivated. Student motivation can determine whether a student studies or does her homework, whether she seeks additional help when she needs it and how carefully she listens in class. A 2006 paper published in â€Å"Annual Review of Psychology† emphasized the role that student motivation plays in learning and found that unmotivated students tend to perform more poorly.The textbook â€Å"Child Psychology† cites research from developmental psychologist Albert Banudra indicating that children who are internally motivated are more likely to excel than children who require external motivation in the form of punishments and rewards. Mental Health Disorders Learning disorders and mental health problems such as attention deficit disorder, dyslexia, autism and oppositional defiant disorder can dramatically affect student behavior. Students with oppositional defiant disorder, for example, struggle to accept authority and may frequently defy teachers and parents, according to â€Å"Child Psychology.†Students who need mental health interventions, occupational therapy or psychoactive drugs may behave poorly in class even when teachers have excellent classroom control. This can affect these students' ability to learn, and students with some disorders may be unable to achieve good grades in typical classrooms. Things That Affect Children's Behavior Many aspects of a child's life affect his behavior. Home and school experiences play a critical role — they shape the way a child develops socially, emotionally, physically and intellectually as well as how he learns to cope in diffic ult circumstances.Within these two environments, sleep, diet, peers and parent discipline each affect behavior. Sponsored Link Natural ADD/ADHD Relief Relieve ADD/ADHD Symptoms Fast with Safe & Homeopathic Synaptol ®. synaptol-for-adhd. hellolife. net Sleep According to the National Sleep Foundation, sleep is â€Å"the primary activity of the brain during early development. † According to an article at CNN. com, a study published in the journal â€Å"Pediatrics† shows that â€Å"sleepy school children make crabby classmates, while students who get plenty of sleep are better behaved.†The study was performed by Reut Gruber, director of the Attention Behavior and Sleep Lab at the Douglas Research Center in Quebec, Canada. For one week, half the children in a class went to bed earlier than the other half. They were healthy children with no prior sleep or behavioral issues. Teachers noticed significant differences in the children's behavior. Students who slept less were overtired, impulsive and irritable. They had much more difficulty handling their emotions. Children who got more sleep were more resilient and alert. Diet A child's diet can also influence his behavior.In 1970, Ben Feingold created a diet that eliminated artificial colors, flavors, sweeteners and preservatives. It was intended as a treatment for attention-deficit/hyperactivity disorder. Feingold suspected that such artificial ingredients led to hyperactivity in children. WebMD notes that â€Å"while most scientific studies have disproved Feingold's theory, some parents who have tried the elimination diet have reported an improvement in their child's behavior. † A new study performed in 2007 supported the theory. Claudia Wallis, in a â€Å"Time† article titled â€Å"Hyper Kids?Cut Out Preservatives,† discusses this study, which was published in the British medical journal â€Å"The Lancet. † The study found that common food dyes and the preservative sodium benzoate can cause children to become hyperactive and distracted. Peers Peers play a powerful role in how a child behaves. Young children learn a lot about behavior through observation and often copy each other. For instance, if a child cleans up his toys in a classroom and gets positive feedback from a teacher, another child might be encouraged to clean up her toys.If a  child throws food and other children laugh, another child might then want to throw food, too. Peer influence on adolescents might be even more powerful. A study performed by researchers at the University of Western Ontario and published in the July/August 2007 issue the â€Å"Child Development† journal showed that a teenager's desire to fit in and be part of a popular group played a role in his behavior. While being part of a group can lead to positive feelings and actions, being part of a deviant group can lead to riskier behaviors in adolescents.Parent Discipline AbilityPath. org describes the aff ect of consistent positive discipline on behavior in an article titled â€Å"Positive Discipline and Guidance for Children. † The goal of positive discipline is to guide your child to behave in socially acceptable ways. The article reviews several parent discipline styles. The authoritarian style emphasizes obedience and might include corporal punishment. This style of discipline can lead to insecure or aggressive behavior in children and an inability to make decisions, according to the site.The neglectful style, in which parents are minimally involved with their children, can cause low self-esteem, little trust in people and trouble learning new skills. The permissive style of discipline lacks structure. Permissive parents rarely enforce rules and tend to allow children to do whatever they please. Children parented in this way may have difficulty handling their emotions and may be less mature. Lastly, an authoritative-democratic –or positive — parenting style i nvolves teaching children to take responsibility for their actions. Appropriate expectations and consequences are made clear.Good behavior is encouraged, modeled and supported. This type of discipline promotes self-control and influences how a child makes decisions and interacts with the world around him. Behavior problems can affect a child's ability to learn and retain new information. Behavior problems at a young age can even predict future academic problems. Children who exhibit behavior problems at age 6 are more likely to struggle in math and reading at age 17, according to a study published in Pediatrics. Address behavior problems as early as possible to increase your child's chances of academic success. Sponsored Link ADD/ADHDNatural ReliefEnjoy Fast ADD/ADHD Symptom Relief with Safe & Homeopathic Synaptol ®. synaptol-for-adhd. hellolife. net Examples of Behavior Problems That Interfere With Learning Hyperactivity Hyperactive children have difficulty staying seated, which makes it difficult to complete school work. Hyperactive children also tend to be forgetful, according to the Johns Hopkins Medicine website. Children who forget things repeatedly struggle to memorize information, making learning very difficult. Hyperactive children may have difficulty participating in quiet activities, such as reading or writing, because they often talk incessantly.Hyperactivity causes children to shift their attention from one activity to another quickly, which poses challenges to a child trying to complete an assignment or task. Impulsivity Impulsive children may disrupt the entire classroom by blurting out answers without raising their hand. Children who answer homework and test questions by writing down the first answer that comes to mind, may score poorly on their assignments. Impulsive children struggle to think ahead, plan and problem-solve effectively, according to Michelle Anthony at Scholastic. com. These impulsive behaviors often interfere with learning a nd applying new concepts.Other impulsive behaviors, such as physical aggression or talking in class, may require disciplinary action that results in a child's removal from the classroom. Inattention Inattention deters a child from being able to focus on a single task. Instead of paying attention to the teacher, a child with attention problems may be watching other children, playing with things in his desk or just staring out the window. At home, children with attention problems may take a long time to complete their homework or they may not have enough mental energy to complete their assignments.Attention problems can also interfere with organization. An inattentive child may forget his homework or lose his assignments. Oppositional Behavior Children with oppositional behavior argue with adults and refuse to follow rules. Oppositional children also struggle to take responsibility for their mistakes, according to the John Hopkins Medicine website. An oppositional child may refuse to attempt any of his work. He may also refuse refuse to participate in certain activities, such as group projects.At home, oppositional children may argue with parents about homework and may refuse to put any effort into completing assignments. What Are the Factors That Affect Academic Achievement of Students? Factors that affect academic achievement include their level of intelligence. Social factors can greatly impact the academic achievements of children as well. Some social factors that should be monitored include aspiration levels, academic inclination, peer relations, social class, and home conditions. What are the factors that affect academic achievement of students?

Comparing Oedipus Rex And Death Of A Salesman By Arthur...

a. Tragedy†¦ we all will go through this at least once in our lifetime. It is inevitable. It has been around since the beginning of time. The ancient Greek’s used it in a manner in which we still use it today in Modern times. b. Today I will be comparing the two works such as Oedipus Rex, which is a playwright written by the great Sophocles and another playwright named Death Of A Salesman written by Arthur Miller. c. Through out the years, there has been a lot of controversy on whether or not Death Of A Salesman is considered to be a tragedy, unlike Oedipus Rex which clearly is. d. I feel these two plays can compare in a multitude of ways despite being written in different historical times. II. Body Paragraphs a. In Oedipus Rex, Oedipus is†¦show more content†¦The only people affected by Willy’s demise are his immediate family members. 1. Willy speaks the language of the consumers; he represents the American middle class that emerged in post war America. Willy blames himself and also the requirement of American society to chase the American dream at the expense of a person’s emotional and spiritual well-being. 2. The words of charley point out the fact that no one deserves the kind of returns Willy was getting at his salesman job. Willy, as the salesman, bought the sales pitch that used by the American society to advertise itself and he paid for it with his own life. 3. The play talks of mortgages, brand names and big multinationals. At the end of the day, he is able to afford his family a house and decent living but Willy believes he is worth more dead than alive. He believes his son Biff would benefit from his insurance compensation following his death. c. The difference as far as Tragedy goes is that in Greek tragedy, the main character is noble or royal and therefore the nation and/or state is at risk because of the main character’s tragic situation. In modern tragedy, the main character is an average person, and therefore there are few people impacted by their tragic circumstances. i. The state in which both the main characters are in when the play begins and ends are the same. 1. In the opening scene of Oedipus Rex, Oedipus the king is confused by what has happened to the city of Thebes. He doesShow MoreRelatedEssay Death of a Salesman, Tragic Hero. Willy Loman.1503 Words   |  7 PagesTo what extent can Willy Loman be considered a tragic hero according to Aristotle’s rules? Arthur Miller presents his play ‘Death of a Salesman’ in the ancient form of a tragedy. Aristotle has defined his idea of the ‘perfect’ tragedy in his text, ‘Poetics’ (350 BC).Here he suggests that the protagonist must fall from an elevated social standing as a result of a â€Å"fatal flaw† within the character; the fall from the main character creates resolution to the play which is seen as just; finally, AristotleRead MoreDeveloping Management Skills404131 Words   |  1617 PagesConflict 375 SKILL LEARNING 376 Interpersonal Conflict Management 376 Mixed Feelings About Conflict 376 Diagnosing the Type of Interpersonal Conflict 378 Conflict Focus 378 Conflict Source 380 Selecting the Appropriate Conflict Management Approach 383 Comparing Conflict Management and Negotiation Strategies 386 Selection Factors 386 Resolving Interpersonal Confrontations Using the Collaborative Approach A General Framework for Collaborative Problem Solving 391 The Four Phases of Collaborative Problem Solving