Factors affecting learners behaviour in Gauteng Special schools Essay

Factors affecting learners behaviour in Gauteng Special schools - Essay Example The challenges of intellectual disabilities, especially in their early stages, have become a priority because of the initial intangibility of the problems. Indeed, the multifaceted and multilateral aspects of intellectual disabilities are not only complex by nature, but they also need socio-psychological interventions to understand and interpret. In addition, the behavioral problems of pupils with intellectual disabilities is an important issue that needs to be looked at from the wider perspective of social development. While the special schools are doing commendable work for these learners, the increasingly worsening behaviour of pupils with developmental disabilities has become a major concern. Special teaching methods to promote learning are needed, as are behaviour plans both to monitor and to assess behaviour, and to develop coping strategies for both teacher and student so that learning can occur. Thus, the research would focus on identifying factors that affect learnersâ€℠¢ behaviour in the special schools, especially in Gauteng, South Africa. 2.Keywords: severe intellectual disability, special school, inclusive education, support system, learning disability, social model of discussion. 3.Background Intellectual disability can be described as a ‘learning difficulty that is characterized by limitations in various skill areas. These may include limitations in self-care, daily living, social interaction, judgment and self-direction (IHC Inc;Philosophy and Policy 1996:p5). Some forms of intellectual disability, i.e. severe autism, become evident in early childhood. Other forms take longer, and may manifest at school age (Notbohm, 2005, preface). In contemporary times, the concept of disability has moved beyond the constraints of the medical terminology and has embraces a socially relevant stance, keeping the needs of the learners as the main objective in all their policies and plans. Terzi (2004) believes that the social model is a powerful and imp ortant reminder for people at large to face issues of inclusion vis-a-vis persons with disabilities. Inclusion of the disadvantaged population, he believes, is a fundamental as well as a moral issue. World Health Organization (2005) reports that people with disabilities are important contributors to society, and that allocating resources to their rehabilitation would be an investment. Hence, measures that support their integration into mainstream society become highly pertinent issues within the development agenda of nations. The inclusion of disabled students can be broadly described as efforts to increase the participation of children with disability in the school by expanding course curricula to incorporate their needs (Booth & Ainscow, 1998). Thus, inclusion ensures that students with special needs are provided with opportunities to imbibe education and become capable of contributing to the society as a whole. In inclusion, students with special needs are integrated into the mai nstream school without much changes within the school environment (Minto, 2007; Mittler, 2000). The special schools in South Africa have shown great determination to promote education amongst children and adults with disabilities. There have been significant reforms in the education system with the National Education Policy Act of 1996 and the South

Is marriage an outdated tradition Essay Example for Free

Is marriage an outdated tradition Essay Is Marriage an Outdated Tradition? In this essay I will be explaining whether marriage Is an outdated tradition along with my opinion and the ones of Christians. In my oplnlon I believe that No, marriage Is the same strong, important connection it was 100 years ago. The difference is the people who enter into it, and the way society no longer supports the couples who choose it. Weve become a need It now society and are ready to discard whatever doesnt give us Instant happiness. Divorce has become so acceptable that couples go Into arriage with the plan to divorce If they arent satisfied (prenup) as compared to the people in our past who believed marriage was forever and were motivated to keep working at the relationship and to make it work. Today couples are ready to give up as soon as its not fun or the sex becomes dull. The other part of the problem Is societys lack of support for marriage. The UK benefit system Is too lenient towards those who choose to have children without being married therefore helping them with housing, childcare, schooling and food. The rest f the family before would be providing emotional support and pressure for the couple to work at the relationship, now its more looked at it as being only their problem and not a problem for the people around them. Today were more concerned about an individuals right to personal happiness than to supporting responsible or ethical behaviour-I believe a persons happiness Is extremely Important but peoples morals and ethics are what make them happy. I also believe the idea that something thats worth having is worth fighting for, having omething a long time, the pride of working at something, at pushing through the hard stuff to be able to stand back and look with pride at having made something great, is gone. The Christians of the Catholic Church teach prohibition of premarital sex along with the rejection of homosexual marriage, abortion and contraception but also the acceptance of everyone and equality but while all those are very Important none is what makes the bond of marriage stick. It happens when two people who are free to marry and are physically and emotionally capable of marriage give themselves o each other, understanding that marriage means being open to life and commitment and to faithful love till death.

Lack of parental interaction

Lack of parental interaction Zafi is the eldest child and he has two younger siblings. He was an average student in primary school with no discipline problems. When he was 11 years old, his father passed away. After the death of his father, his mother holds two jobs to make ends meet. His mother relies on him to take care of his two younger siblings as she is always not at home. Currently in secondary two, his academic result is very poor. In class, he would keep to himself and would shy away from classroom activities. He would sometimes cheat in tests and exams. The reasons he gave for cheating are, not having the ability to do it and he does not want his classmates to think that he is stupid. His form teacher tried many times to meet his mother to discuss about his cheating behaviour and poor academic performance but she is always busy with her work. After school, Zafi would meet up with his neighbourhood friends. Most of them are drop outs. They constantly told him to quit school and to enjoy life just like t hem. Zafi enjoys spending time with them as he thought they understand him best. They would also smoke and drink alcohol. He would only return home very late at night or not at all. Zafis father had passed away and his mother is too busy working to support the family. There is almost no interaction between Zafi and his mother and there is no other important adult to supervise him at home. In short, the parental involvement is almost non-existent. Using Bronfenbrenner Bioecological Theory and Baumrind Parenting Style Theory, I would relate how Zafis parental interactions and parenting style affects his context of development. Bronfenbrenner Bioecological Theory According to Bronfenbrenner, the lack of parental interaction is the most destructive force to a childs development. [1] Urie Bronfenbrenner says that there are two environmental conditions that are necessary for human development. The first is that one or more adults must love the child unconditionally; the second is that the adults must encourage the child and spend time doing joint activities with the child in and out of the home environment. [2] Zafis mother loves him unconditionally but she is too busy to show it and she is also unable to spend time with any of her children. Therefore, the two important conditions are not met. Bronfenbrenner also developed a Bioecological Theory to explain how the childs environments can significantly influence his cognitive development and his growth. The theory consists of 4 systems nested around each other with the child being in the innermost. The 4 systems developed by Bronfenbrenner are: microsystem, mesosystem, exosystem, and macrosystem. [3] The microsystem is where a child has direct interactions with parents, teachers, peers and others. In Zafis case, he has very little interaction with his mother and he spends most of his time with his neighbourhood friends. Too little interactions with his mother causes a break down in his microsystem and the bad influence he is getting from his neighbourhood friends is not helping in his positive growth and development. The second level is the mesosystem. Mesosystem are linkages between microsystems such as between a childs teacher and his parents, and relationships between students and peers. His teacher tried many times to c reate a linkage with his mother but failed due to her busy work schedule. This contributes to a break down in his mesosystem. The third level is the exosystem. Exosystem are external experiences in which a child does not have an active role but still influence the childs developments. In this case, his mothers busy work schedule is the exosystem. Her two jobs require her to work long hours and irregular shifts. This resulted in her having very little face time with her children. The last level is the macrosystem. Macrosystem consists of things that influence and sometimes support the child such as cultures, norms, and laws. The break down in his microsystem will affect the other systems as it disabled him to explore other parts of his environment. Without the presence of proper supervision or love, Zafi will try looking for attention in inappropriate places. These behaviours will give rise to problems such as little self discipline and no self direction. Neglectful Parenting According to Diana Baumrind, parenting styles come in three main forms; authoritarian parenting, authoritative parenting, and indulgent parenting. Eleanor Maccoby and John Martin expanded BaumrindHYPERLINK http://www.law-of-attraction-parenting.com/baumrind-parenting-style.htmlHYPERLINK http://www.law-of-attraction-parenting.com/baumrind-parenting-style.htmls research and added another parenting style, Neglectful or Uninvolved Parenting (Maccoby Martin, 1983). [4] The degree of supervision and discipline shown by Zafis mother is minimal, and there is no consequence for unacceptable behaviour. She does not deliberately encourage Zafi to self regulate his behaviour and there is very little communication between them. These are the characteristics of neglectful parenting. Even though she fulfills her children basic needs such as food and clothing, sadly, she is detached from their life. She is also psychologically unavailable to her children. Neglectful parenting style rank lowest acro ss all life domains. Children with neglectful parents tend to lack self-control, have low self-esteem and are less competent than their peers. They often engage in high-risk behaviours and are vulnerable to substance abuse. [5] Interventions Bronfenbrenner said that to ensure healthy child development, one or more adults must love the child unconditionally and they must spend time doing joint activities with the child in and out of the home environment. However, in Zafis case, this is not possible for his mother. What she could have done to increase the level of interaction with her son is by communicating with him more through the phone. During her short breaks at work, she could have called her son to ask about his day at school, find out whether he has eaten and to also provide psychological and emotional support in case his son is upset over a school event such as a failed test. This way, the child knows his mother cares for him and he can also feel his mothers love and affection. She should also try to take at least a day off weekly to spend valuable face time with her children. If it is not possible, she should ask her parents for help in taking care of her children while she is at work. There must be at least one adult present at home so that the child would not feel neglected. As for the teacher, he needs to be flexible to adjust to the parents inflexible work schedule. If meeting with the parent in person is not possible, he should at least keep in close contact with the parent through the phone and to update her about her sons learning progress and behaviour. In doing so, he is successful in creating a linkage with the parent. Once there is a linkage, it will be much easier for both teacher and parent to work together to ensure the childs healthy development. The teacher can also educate parents about the developmental needs of children. Research indicates that family involvement in schools increases student achievement (Henderson Berla, 1994). [6] The benefits of parent and family involvement include higher test scores and grades, better attendance, more completion of homework and more positive attitudes and behavior. Next, I would relate how Zafis parental interactions and parenting style affects his self and identity development. Self-Esteem Children look to parents and other important adults for evidence that theyre smart, capable, etc. This evidence may be in the form of encouragement, praise for accomplishments, awards, etc. If the evidence is not present, low self-esteem develops. [7] This explains why neglectful parenting results in children with low self-esteem. Low self-esteem can have a big negative impact on academic performance. Once a child does poorly in school, he will start to think poorly of himself and it may cause him to underachieve or make him give up completely. Children with low self-esteem tend to be lonely in school as they find it hard to make new friends. They would shy away from classroom activities as they do not want to appear incompetent. Resisting negative pressures would also seem difficult for these children. [8] Looking at Zafis case, it is obvious that he is suffering from low self-esteem. He is doing very poorly in school and at home he never gets the encouragement he needs to make him feel better. He is also not motivated to study as no matter how well he performs, his mother is not there to praise or acknowledge his accomplishments. In class, he is afraid to get involve in classroom activities and he constantly keeps to himself. He is also not able to resist negative pressures from his neighbourhood friends. As he spends more time with them, he developed a sense of belonging towards them and this sense makes him want to be like them. Interventions It is important that teachers look out for and help students who are suffering from low self-esteem as it can affect their academic performance and also their overall well-being. Teachers should be paying more attention to students like Zafi. They tend to have low self-esteem due to the lack of attention, love and affection. Students with low self-esteem will say things like, I know that I will fail or I hate myself. They tend to avoid getting involved in new activities and would have trouble making new friends and mixing around. Stresses faced at home such as parents arguing a lot and difficult lessons can have a negative impact on a childs self esteem. Some of the things that teachers can do to improve students self-esteem are, to always accentuate the positive, avoid criticism, set realistic expectations for the students and give them the opportunity to tell the class things they like about themselves. Those with very low self-esteem will have problem with even saying two things t hey like about themselves therefore, the teacher have to provide prompts for these students. Eriksons Psychosocial Development Theory Erik Erikson highlighted the importance of relationships with others in the formation of ones own identity. He believed that personality develops through eight stages of life. He suggested that at each stage of life an individual is confronted by a crisis (Erikson, 1950). At this age, Zafi is going through stage 5 crisis of Eriksons Psychosocial Development Theory which is Identity versus Role Confusion. In this stage, adolescents struggle to resolve the question of Who am I? They move from their parents to peers as a point of references. They strive to clarify their own personalities. They are often observed to imitate the attitudes and actions of others they admire. In Zafis case, his neighbourhood friends are his only point of reference. As he respects and admires them, he chose to imitate their attitudes and actions. He would smoke and drink alcohol with them till late at night. Interventions In Identity versus Role Confusion stage, adolescents will move to peers as a point of reference. As Zafi is not close to anyone else in school, he is left with no choice but to see his neighbourhood friends as references. What can be done by the teacher is to introduce buddy system to pair up low self-esteem student such as Zafi with a higher self-esteem one. The higher self-esteem student may be able to help Zafi with his studies and thus increasing his confidence and self-esteem. Zafi may look up to his buddy as his role model and thus imitate him instead of his neighbourhood peers. The teacher should also provide plenty of opportunities for students to explore identity issues as they relate to understanding who they are as individuals. An activity such as making a collage about themselves or writing their autobiography is a good way for them to explore themselves. The teacher can also enhance students self esteem by encouraging the students to substitute negative self-statements with a positive one. Lastly, I would relate how Zafis parenting style affects his moral development. His mother neglectful parenting style resulted in him lacking self-control, having low self-esteem and feeling less competent compared to his peers. His low self-esteem caused him to have low self-confidence which led him to believe that he does not have the ability to pass his examinations. As he does not want his classmates to think that he is stupid, he decided to cheat in his tests and examinations. Kohlbergs Stages of Moral Development The reason why Zafi cheated is based on self-interests. From his reasoning, his moral development is in Level 1: Preconventional Reasoning; Stage 1: Punishment-Obedience, of Kohlbergs stages of moral development. His reasoning is characterised by a focus on the consequence experienced by him as a result of his actions. Interventions To minimize cheating, teachers should clearly spell out the consequences of cheating and to consistently follow through with these when cheating does occur. Teachers can also help students overcome the need to cheat by providing the student with extra help and reducing student anxiety. Student anxiety can be reduced by emphasizing that mistakes are okay and a part of learning.

Fattening: The social implications on the Azawagh Arabs and the real me

Throughout the ethnography, â€Å"Feeding Desire† written by Rebecca Popenoe, we see one consistent theme that is brought up time and time again – women and the fattening of them to obtain a desired look. From the perspective of a Western third party, the idea of fattening to appear beautiful/appealing seems ridiculous. It simply makes little sense because fattening, is incredibly unhealthy, something that is recognized in Western culture and at the same time we prefer women to be as fit as possible. Looking through the ethnography we see that there are many reasons for fattening being a key factor in making women â€Å"an object of desire† (Page.. citation) as stated by Popenoe. We can examine these cases through the work of Popenoe and determine as to how she came to this conclusion. At the start of the ethnography we can see from Popenoe’s initial experience while working with the Peace Corps in Niger, that the idea of fattening and how the women she saw originally seemed as â€Å"unattractive lumbering† (Popenoe 2004: 20). It was however while working with the Peace Corps that Popenoe noticed that this rounded shape that was the norm among the women and was far more appreciated and desired. After having decided to live with the Azawagh Arabs, Popenoe expresses the obvious indication of her being the outcast when it came to female sexual competition shown through the statement, â€Å"With collar bones protruding and not a stretchmark to be found on my upper arms, I believe many women considered me a poor specimen of my sex.† (2004: 20). Even though it is shown that women and men are usually separate, Popenoe’s lack of physical beauty as per the Azawagh Arab women, allowed her to communicate with the men with no fear from the women that... ...dent that his job in gathering better subsistence is going very well, likely meaning he is wealthy. It is not something which is meant to show off, but just happens in cases of abundance (2004: 112). Most importantly is the control a woman can have over their husband, by waiting till the night to discuss what is on their mind as that is the point in the time where a man can’t refuse them, their lust and sexual desire forces them to listen pretty much. Popenoe does an excellent job in her ethnography giving us the perspective of the Azawagh Arab society. We see how the culture is in such a society where women are fattened for many reasons that are important such as sexual desire, marriage, and the passage towards womanhood. Such fattening has run societies in the area including the Azawagh Arabs since they were discovered and continue to do so today.

conducting a strategic audit Essay -- essays research papers

Conducting a Strategic Audit http://www.albany.edu/~pm157/audit.html http://faculty.uwstout.edu/adekolaa/STRAMGT/powerpoints/Wal-Mart%20-%202000.ppt#256,1,Wal-Mart – 2000 One purpose of this course is to train you to assess an organization’s strategy. Part of your skill development is utilizing knowledge to address the real problems of a business organization. At the same time, technology is increasing your ability to obtain information rapidly from multiple sources. Being able to gather and use such information will become a competitive necessity for anyone in business and management. To prepare you for this, we used information technologies to analyze, discuss, and present business issues throughout the semester. To achieve these, you will form a group. While some information may be obtained from library research, field work, or direct interviews, it is expected that you will extensively use the Internet to integrate the diverse information from a top-management perspective. Each team will present its findings and recommendations to the class during the final sessions. They may then make changes for their final written report. Please consider these eight dimensions in formulating a unified, comprehensive, and integrated set of decisions that attains organization purpose. ________________________________________ Step 1: Situation Assessment †¢ What is our purpose? What is our "strategic intent"? †¢ How do we rank in our business and why? †¢ What is our fiscal condition and why? †¢ What is the relationship between the business strategy, organization environment, and overall performance? †¢ What is our sustainable competitive advantage? What core competencies do we posess? †¢ What are our strengths? Do we use these fully? †¢ What are our weaknesses? How can we solve or mitigate these? †¢ What are our opportunities? How can we exploit these? †¢ What are the threats to us? What can we do about them? Step 2: Strategic Managers †¢ What is our strategic vision? †¢ Do the executives possess the right leadership skills and abilities? †¢&nbs... ...; What are the expected fiscal results? †¢ What are the feasible alternatives to these activities? Step 7: Implementation †¢ What resources will this action plan require from finance, human resources, marketing, operations, and other functional areas and departments? †¢ What changes will have to occur for us to be successful in 2 to 5 years? †¢ Are there other organizations or individuals we might collaborate with? †¢ What training is necessary? Step 8: Performance Evaluation and Control †¢ When and how will we evaluate performance? †¢ What are the desired quantitative and qualitative measurements of success? †¢ Will this strategy justify the needed time and resources? †¢ Can we afford it? †¢ Realistically, can we implement this action plan? †¢ Have we included all supporting programs? †¢ Can we clearly establish accountability?

Should Vietnam Concentrate on Tourism for its Economic Development?

Vietnam is in the republic of South East Asia, bordered by China on the north, by the South China Sea on the east and south, and by Cambodia and Laos on the west. Officially the Socialist Republic of Vietnam, its area is 331,690 sq km (128,066 sq mi). Hanoi is the capital of Vietnam and Ho Chi Minh City is the country's largest city. Ho Chi Minh is at the coordinates 106 degrees south, 10 degrees west on a map. There many ways in which the tourist industry would benefit Vietnam as a whole. Tourism, of course, makes a huge amount of money; it could be hundreds of millions every year. For example places like Barcelona have become huge, great cities full of people thanks to the money made from tourism. Also read this  Cheating in a Bottom Line Economy Tourism also creates lots of new jobs for the people living in the country and some people who will come to work in Vietnam from other countries. The new jobs will trickle right down to the farmers who grow the food for the people who sell food to the hotels. This means it will be very good for agriculture, giving farmers more money to buy more land and grow more crops. People who have jobs in other industries making products for MEDCs like workers in Pepsi factories, could easily switch to having an easier but better paid life in the tourist industry. Concentrating on tourism alone might still work for Vietnam. If the locals take part in planning and decision making, the tourists are responsible in Vietnam and the government sets policies and plans ahead for it then it could work quite well. But even if it does work then there will be some downsides. Tourists generally makes quite a lot of mess wherever they go, they can destroy some of the beautiful beaches and rainforests. The rainforests themselves will have to be cut through for new highways, towns and airports. With the new highways would, hundreds upon thousands of cars and trucks, which would eventually pollute the country, turning tourist away from it. The effect on the countries fishing industries could be catastrophic. The South China Sea could be way over-fished, so hotels and resorts would have to import fish, driving prices up and making the appeal of fresh fish vanish. The effect on individual families could be bad too; the father could have to move away to a bigger city, potentially leaving the family behind, splitting the family up. This could happen to thousands of families. If the tourist industry failed then the country would have nothing to fall back on, it would use up all its money and end up back at the start. Unfortunately, most of the money tourists spend in foreign countries is immediately used to import more food, equipment and resources for the hotels and nightclubs. This leaves little money left over for the local people and economy. In conclusion I think that Vietnam should seriously consider Tourism as a big part of their economy but I don't think that they should ignore everything else. If given the time, Vietnam could become just as unwieldy as Japan in the computer services/games industry or as big as America or Germany in the automotive industry. I think the best effect of tourism in Vietnam would be the huge amount of jobs it creates and could make thousands of informal jobs vanish for formal tourism jobs. The worst thing about tourism in Vietnam would be the huge amount of damage that would be inflicted on such a beautiful landscape thanks to all the cars, litter and sewage caused by the tourists. In other words tourism could be great for the country but disastrous as well. But I still think concentrating on tourism would be a bad idea for Vietnam's economy.

Strain Controlled Triaxial Test- Geotechnical Engineering

1. INTRODUCTION From civil engineering view, Soil is the medium through which the structural loads are transferred safely and efficiently. Soil should be consistent enough to satisfy the requirements even under inevitable circumstances like earthquake, bomb reactions etc. It is necessary to incorporate the seismic effects into the soil properties. Like concrete or steel, engineering properties of soil cannot be found out using theory of classical dynamics and vibrations. It can be found only field and lab tests. To quench the above requirement, various techniques are employed nowadays. The most common methods are cyclic simple shear, cyclic triaxial shear and cyclic torsional shear tests. The dynamic triaxial test is the most effective method to arrive the static and dynamic properties of soil like cyclic deformation, damping ratio, liquefaction strength etc. Though it has some limitations, it is widely used for the analysis of soil under seismic forces. The fundamental parameters obtained from this test are cyclic shear stress and cyclic shear strain, through which the soil is defined. The tests can be done either by stress controlled (cyclic shear stress) or strain controlled (cyclic shear strain). The test setups are highly sophisticated and costly. It needs highly skilled labour. The measuring devices used in the system needs to be calibrated and sealed properly as it is more sensitive to disturbances. The results obtained reflect the site seismic condition to the maximum level provided the strain level is kept minimum. Fig 1. 1 Triaxial Cell Fig 1. 2. A typical Cyclic triaxial apparatus 1. 1WHY DYNAMIC TRIAXIAL The Dynamic forces are time dependent and are usually cyclic in nature i. e. they involve several cycles of loading, unloading and reloading. Earthquake is three dimensional in nature. Hence the shear waves and body waves produced by the earthquake tend to deform the soil in all the directions (for the horizontal level ground). Dynamic Triaxial tests actually reflect the soil condition (in all round stresses) in the site. During earthquakes, the seismic waves cause the loose sand to contract and thereby increasing the pore water pressure. Under undrained loading, development of high pore pressure results in upward flow of water, thereby making the sand in liquefied condition. Pore water pressure is measured effectively in triaxial tests. Among the stress-control and strain-control condition, strain control is adopted widely. This is because; stress-control test has great sensitivity to the sample disturbance. In case of strain-control, pore pressure developed during tests is less affected by specimen fabric and density. The tests can be done on intact specimens and reconstituted specimens. While comparing the results obtained from intact and reconstituted specimens, there is much deviation in stress-control compared to strain-control. (tests done by vucetic and dobry, in 1988). Stress path control is used in the study of path dependence of soil behaviour. Stress deformation and strength characteristics depend on initial static stress field, initial void ratio, pulsating stress level and the frequency of loading. 1. 2APPLICATIONS There are variety of engineering problems which rely heavily on the behaviour of soils under dynamic conditions. These includes design and the remediation Of machine foundation, geotechnical earthquake engineering, protection against construction vibration, non-destructive characterization of the subsurface, design of offshore structures, screening of rail and traffic induced vibrations, vibration isolation etc. When it comes to dynamic triaxial test, the wide range of application is the liquefaction behaviour of soil under seismic forces. 2. HISTORY One of the first pieces of equipment designed to test cyclic triaxial loading was the pendulum loading apparatus by Casagrande and Shannon in 1949. This utilizes the energy of the a pendulum which when released from a selected height, strikes a spring connected to the piston rod of a hydraulic cylinder, this cylinder is further connected to another cylinder located above the cel. The time of loading was between 0. 05 and 0. 01 sec. Fig. 2. 1. Pendulum Loading Apparatus Casagrande and Shannon came up with an equipment called Falling Beam Apparatus as shown in Fig. 2. 2 In 1960, Sead and fead used Pneumatic System for cyclic loading. It marks the evolution of the dynamic triaxial shear apparatus. Fig. 2. 2. Falling Beam Apparatus 3. PRINCIPLE First attempt was made by Seed and Lee (1966) by consolidating a saturated sample under a confining pressure and subjected to constant amplitude cyclic axial stress under undrained conditions. This test was performed till they deformed to a certain amount of peak axial strain. Under this condition creates a stress conditions on a plane of 45 ° through the sample which is the same as those produced on the horizontal plane in the ground during earthquakes. This is the basis on which the cyclic triaxial test works. Fig. 3. 1. Simulation of geostatic and cyclic stress in triaxial test. Shear stress is taken into account as it causes deformation. To incorporate seismic effects, uniform shear stress for a given cycle is adopted for non-uniform stress time data. To achieve that a maximum shear stress is multiplied by a correction factor ?. Then the test is carried out till required deformation or failure to occur. 4. EQUIPMENT 4. 1. Parts of Dynamic triaxial apparatus suggested by ASTM D 3999 – 91(2003) APPARATUSPURPOSECONSIDERATION 1. Triaxial Pressure CellTo mount sample and conduct testTolerance for piston, top platen & low friction piston seal. Ball bearings and friction sealTo minimise frictionFriction can be,  ±2 % of the maximum single amplitude cyclic load Load rodTo facilitate loadingdia = 1/6th of specimen dia Specimen cap & BaseTo provide a sealed platform Rigid, non corrosive, impermeable, Cap weight < 0. 5% of applied axial failure load (static), Valves To regulate back pressure, cell pressure, pore water pressureLeak-proof, withstand applied pressure Top and bottom platensTo facilitate loading and provide a rigid baseProper alignment, load rod sealed with top platen with friction seal. 2. Cyclic Loading EquipmentTo induce cyclic loads Uniform sine wave @ 0. 1 to 2 Hz, simple ram or a closed loop electro hydraulic system 3. Recording EquipmentsTo record the data obtainedProperly calibrated Load MeasurementTo measure the cyclic loadsElectrical, analog or digital Axial deformation MeasurementTo measure the strain rateLVDT or dial guages Pressure ControlTo regulate cell pressureMercury or pneumatic device Pore Pressure transducerTo measure pore pressureTransducers or electronic pressure meters Volume change MeasurementTo check the volume change in the specimenCalibrated and widely used guages 3. Miscellaneous a. Rubber membrane b. Filter paper To hold the specimen To facilitate saturation Leak-proof with minimum restraint Must not cover more than 50% of the specimen. Fig. 4. 1. Schematic Diagram of a stain-controlled dynamic triaxial test 4. 2WORKING PROCEDURE The working mechanism mainly involves three phases a)Saturation phase:Initially the sand is sample saturated by applying cell and back pressure simultaneously. (cell pressure > back pressure) b)Consolidation phase: during test, void ratio should be kept constant. It is obtained in this phase. Back pressure valve is closed. )Load Phase: Actual test begins here. Strain rate is fixed using gear system. Cyclic load is applied either using hydraulic or pneumatic type. Loads and corresponding strains are recorded at loading, unloading and reloading. Test is continued until the required strain or failure occurs. 5. RESULTS From the cyclic triaxial test, we can obtain various graphs for detailed analysis, †¢Load Vs Deform ation †¢Deviatoric Stress Vs Time †¢Axial Strain (%) Vs Time †¢Excess Pore Pressure Vs Axial Strain (%) †¢Excess Pore Pressure Vs Time †¢Deviatoric Stress Vs Axial Strain (%) Fig. 5. 1. Axial load Vs. axial deformation From the hysteresis loop obtained, the dynamic Young’s modulus (Ed) can be calculated, from which shear modulus (G) can be calculated using poisson’s ratio ( µ). Damping factor (D) can also be calculated from the loop obtained. Shear Modulus, G = Ed / 2(1+ µ) Damping factor,D = Ai / 4? At Ai ? Area of Loop At ? Area of shaded portion 6. Discussions: Two series of undrained cyclic triaxial strain controlled tests were performed by Mladen Vucetic and Richardo Dobry, on two different Imperial Valley, California, silty sands which liquefied during an earthquake in 1981. Both intact and reconstituted specimens were tested. The cyclic shear strain is the fundamental parameter governing pore pressure buildup. The saturated deposit is composed of two layers: an upper, looser, sandy silt unit located between 2. 6 m and 3. 5 m depth, containing more fines (37%) (sand A), and the lower, loose to medium-dense sand unit located between 3. 5 m and 6. 8 m, containing less fines (25%) and (sand B). Selected plots of normalized cyclic shear stress, ? cy* = ? cy/? c„ and normalized residual pore pressure, u* = u/? c, versus number of uniform strain cycles, nc, up to nc = 30, are shown in Figs. 6. 1 and 4 for sands A and B, respectively, ? y above is the amplitude of cyclic shear stress acting on 45 ° planes within the specimen, with ? cy= ? dc/2 , where ? dc is the cyclic deviatoric stress amplitude, and u is the accumulated residual cychc pore pressure at the end of the pertinent strain cycle, derived from measurements at the point of the cycle at which the cyclic stress ? dc = ? cy = 0. Fig. 6. 1 Comparis on of results obtained on intact and reconstituted specimens of sand A The effect of sand fabric, that is, the difference between results obtained on reconstituted and intact specimens, is analyzed next for both sands A and B, with the help of Figs. . 1 and 6. 2. It can be readily noticed in these two figures that the residual pore pressures in cyclic triaxial strain-controlled tests are practically unaffected by the change of sand fabric (u* versus nc curves), while, on the contrary, soil stiffness is significantly affected (? cy* versus nc curves). This is especially noticeable in Fig. 6. 2. Fig. 6. 2 Comparison of results obtained on intact and reconstituted specimens of B. Fig. 6. 3 Residual pore pressure in reconstituted specimens of sands A and sand B It must also be noticed that the range of cyclic shear stresses measured at a given cyclic strain in Figs. . 1 and 6. 2, for the two sands and for the two types of specimen fabric, is quite wide, in contrast to the corresponding range of pore pressures in Fig. 6. 3, which is very narrow. This confirms once again that cyclic shear strain is the fundamental parameter governing pore pressure buildup, and that use of strain-controlled testing represents the most appropriate, as well as the most convenient, approach currently available for evaluation of seismic pore pressures and liquefaction of level ground sites. 7. FACTORS AFFECTING CYCLIC STRENGTH Effect of Confining Stress Critical void ratio is not a constant but decreases as confining pressure increases. The stress ratio decreases with increasing confining pressure. Effect of Loading Wave Form As the load data obtained from history are converted into uniform cycle by ?. The order of increasing strength was rectangular, triangular and sine Effects of Frequency on Cyclic Strength The frequency effects have only a minor (< 10 percent) effect on cyclic strength of the soils. The slower loading frequency have slightly higher strength. Effects of Relative Density At relative densities < 50%, complete liquefaction occurred almost simultaneously, and relative densities above 70% were required for safety against large strains. Effects of size & Gradation Well-graded material was somewhat weaker than uniformly graded material. This finding was attributed to a greater densification tendency in well-graded soils, as finer particles move into voids between larger particles, than occurs in uniformly graded soils. This densification tendency causes increased pore pressure. Effects of sampling on strain history Once a specimen has liquefied and reconsolidated to a denser structure, despite this densification, the specimen is much weaker to cyclic stresses reapplied. Effects of Over consolidation Ratio and Ko The maximum deviator stress required to cause a critical strain for a specified number of cycle’s increases with the Ko ratio. Also the cyclic strength increases as OCR and fines content increase. 8. VALIDATION The validation of the apparatus is done by successive tests, researcher’s experience and available equipments. Mladen vucetic and richardo dobry conducted two series (Intact and Reconstituted Specimens) of undrained cyclic triaxial tests on Imperial Valley, California, silty sands which liquefied during an earthquake in 1981. The results were compared and the experimental set up was validated. Further the tests were conducted on different types of sand and validated. 9. DEVELOPMENTS Since 1966, there has been a considerable improvements in the triaxial testing apparatus meeting results of higher accuracy and efficiency. Initially stress controlled methods were used, then strain controlled methods were adopted. To apply loads, initially hydraulic jack was used, then pneumatic system was used and then electro piezometer. Likewise there are so many advancements of triaxial tests. Some of the advancements are discussed below. Chan (1981), and Li et al (1988) Fig. 7. 1. , have developed a popular electro-pneumatic apparatus which incorporates many advancements in apparatus design and operation. Fig. 9. 1. Electro-pneumatic Apparatus Automated Cyclic Triaxial system is the next development, which is the most comonly used apparatus. It is well known for its automated input and output System, data acquisition and quick results. Fig. 9. 2. Automated Triaxial System 9. 1 RECENT ADVANCEMENTS GDS Entry level Dynamic triaxial testing system ?Technical Specifications ?Maximum Operating Frequency: 5Hz ?Minimum Operating Frequency: < 0. 001Hz ?Highly accurate dynamic, electro-mechanical actuator ?Available sample sizes (depending on cell selection): 38 x 76mm (or ? 39. 1 x 78. 2mm) to ? 150 x 300mm. Fig. 9. 3. GDS ELD ? 16-Bit dynamic data logging ?16 Bit dynamic actuator control channel ?Cell pressure range to 2MPa (dependent of cell choice) ?Small laboratory foot print No hydraulic power pack required ?Standard Triaxial cells can be used (upgraded to dynamic seals and bearings) ? Can be upgraded to perform P and S wave bender element testing. ?Can be upgraded to perform unsaturated triaxial testing with the addition of the following items: a)Unsaturated pedestal with high air entry porous stone. b)1000cc digital air Pressure/volume controller (ADVDPC) for the applicati on of pore air pressure and measurement of air volume change c)Optional HKUST double cell (available in the data sheet ‘Unsaturated Triaxial Testing of Soil (UNSAT). As well as dynamic triaxial tests, the ELDyn system can be utilised to carry out traditional triaxial tests such as UU, CU and CD as well as more advanced tests such as stress paths, K0 and Resilient Modulus tests. HS28. 610 cyclic triaxial test system is also a sophisticated apparatus available in Newdelhi (India). DYNATRIAX is another advanced cyclic triaxial equipment available at many places Los Angeles, Poland and many countries. It can operate at a maximum frequency of 10Hz. 10. CONCLUSION Many innovative systems for cyclic loading of soil have emerged in geotechnical engineering. Each system has its unique advantages and limitations. Some ways of minimizing these limitations have been pointed out. The advanced equipments are an additional tool for performing cyclic loading, in particular liquefaction testing. Extreme care must be used in preparing remoulded sand specimens, and special attention must be paid to testing techniques in order to obtain reproducible test results. In particular, the method of specimen preparation, the shape of the loading wave form, and the preciseness of density determinations greatly affect cyclic strength. Hence, development of ASTM standards for cyclic triaxial testing should include consideration of these factors in the results of this investigation. 11. REFERENCES: ASTM D 3999 Determination of Modulus and Damping Properties of Soils Using the Cyclic Triaxial Apparatus Advanced triaxial testing of soil and rock – Page 484 by Robert T. Donaghe, Ronald C. Chaney, Marshall L. Silver Chan, C. K. , 1981, â€Å"An Electropneumatic Cyclic Loading System,† Geotechnical Testing Journal, ASTM, Vol. 4, No. 4, pp. 183-187. Dynamic Geotechnical Testing H Ronald J. Ebelhar, Vincent P. Drnevich, and Bruce L. Kutter. STP 1213 ASTM Publication Dynamic Geotechnical Testing : a symposium by Marshall L. Silver Khosla, V. K. and Singh, R. D. , â€Å"Apparatus for Cyclic Stress Path Testing,† Geoteehnical Testing Journal, GTJODJ, Vol. 6, No. 4, Dec. 1983, pp. t65-172. Fundamental of Soil Dynamics and Earthquake Engineering By Prasad. Soil Liquefaction, a critical state approach by Mike Jefferies & Ken Been Kramer, Steven L. , Geotechnical Earthquake Engineering, Prentice-Hall, Inc. , Upper Saddle River, NJ, 1996 Townsend, F. C, â€Å"A Review of Factors Affecting Cyclic Triaxial Teste,† Dynamic Geotechnical Testing, ASTM STP 654, American Society for Testing and Materials, 1978, pp. 356-383.