physic essays

physic essays Metamorphosis: In biology, striking change of form or structure in an individual after hatching or birth. Hormones called molting and juvenile hormones, which are not species specific, apparently regulate the changes. These physical changes as well as those involving growth and differentiation are accompanied by alterations of the organism's physiology, biochemistry, and behavior. From animal development. Metamorphosis, the transformation of the larva into an adult, is a more or less complicated process depending on the degree of difference between the two forms. The transformation may be gradual, extend over a long period, and involve a number of intermediate stages; alternatively, the transformation may be achieved in one step. In the latter case, especially if the difference between the larva and adult is great, large parts of the body of the larva, including all the specifically larval organs, disintegrate (necrobiotic metamorphosis). Critical mass: Én nuclear physics, the minimum amount of a given fissile material necessary to achieve a self-sustaining fission chain reaction under stated conditions. Its size depends on several factors, including the kind of fissile material used, its concentration and purity, and the composition and geometry of the surrounding reaction system. History ...

EFL Instructors

Writing Skills Teaching Guide for ESL/EFL Instructors Writing competence in a foreign language tends to be one of the most difficult skills to acquire. This is true for English as well. The key to successful writing classes is that they are pragmatic in nature targeting the skills required or desired by students. Students need to be personally involved in order to make the learning experience of lasting value. Encouraging student participation in the exercise, while at the same time refining and expanding writing skills, requires a certain pragmatic approach. The teacher should be clear on what skills he/she is trying to develop. Next, the teacher needs to decide on which means (or type of exercise) can facilitate learning of the target area. Once the target skill areas and means of implementation are defined, the teacher can then proceed to focus on what topic can be employed to ensure student participation. By pragmatically combing these objectives, the teacher can expect both enthusiasm and effective learning. Overall Game Plan Choose writing objectiveFind a writing exercise that helps to focus on the specific objectiveIf possible, tie the subject matter to student needsProvide feedback through correction activities that call on students to correct their own mistakesHave students revise work Choose Your Target Well Choosing the target area depends on many factors; What level are the students?, What is the average age of the students, Why are the students learning English, Are there any specific future intentions for the writing (i.e school tests, job application letters, etc.). Other important questions to ask oneself are: What should the students be able to produce at the end of this exercise? (a well-written letter, basic communication of ideas, etc.) What is the focus of the exercise? (structure, tense usage, creative writing). Once these factors are clear in the mind of the teacher, the teacher can begin to focus on how to involve the students in the activity thus promoting a positive, long-term learning experience. Things to Remember What will students be able to do after the exercise?Keep the focus on one area of English writing skills Having decided on the target area, the teacher can focus on the means to achieve this type of learning. As in correction, the teacher must choose the most appropriate manner for the specified writing area. If formal business letter English is required, it is of little use to employ a free expression type of exercise. Likewise, when working on descriptive language writing skills, a formal letter is equally out of place. Keeping Students Involved With both the target area and means of production, clear in the teachers mind, the teacher can begin to consider how to involve the students by considering what type of activities are interesting to the students; Are they preparing for something specific such as a holiday or test?, Will they need any of the skills pragmatically? What has been effective in the past? A good way to approach this is by class feedback or brainstorming sessions. By choosing a topic that involves the students the teacher is providing a context within which effective learning on the target area can be undertaken. Correction The question of which type of correction will facilitate a useful writing exercise is of utmost importance. Here the teacher needs to once again think about the overall target area of the exercise. If there is an immediate task at hand, such as taking a test, perhaps a teacher-guided correction is the most effective solution. If the task is more general (for example, developing informal letter writing skills), maybe the best approach would be to have the students work in groups thereby learning from each other. Most importantly, by choosing the correct means of correction the teacher can encourage rather discourage students.