Xem 1-9 trên 9 kết quả Metal categories
  • We make up mental categories continuously, every time we think, be ... combination in order to make up a mental category, are a form of memory. ...

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  • For more than 30 years there has been remarkable growth in the need for quality water purification by all categories of users – municipal, industrial, institutional, medical, commercial and residential. The increasingly broad range of requirements for water quality has motivated the water treatment industry to refine existing techniques, combine methods and explore new water purification technologies.

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  • Let’s see what the dinner party will involve? (See illustration of work breakdown structure) It is a lot more complicated than one would think. Major tasks include setting up and running the dinner, entertainment, and silent auction, finding a dinner speaker and clean up after the dinner is over. Beneath these major tasks are subtasks broken into 16 discrete categories. Each of the subtasks will break down into repeated or “one-off” steps. The complete list of steps with milestones runs to 75 entries. (See illustration of task list). ...

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  • semiconductors.In the first category are substances which provide an easy path for an electric current. All metals are conductors, however some metals do not conduct well. Manganin, for example, is a poor conductor. Copper is a good conductor, therefore it is widely used for cables. A non-metal which conducts well is carbon. Salt water is an example of a liquid conductor. A material which does not easily release electrons is called an insulator. Rubber, nylon, porcelain and air are all insulator. There are no perfect insulators.

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  • If we connect a battery across a body, there is a movement of free electrons towards the positive end. This movement of electrons is an electric current. All materials can be classified into three groups according to how readily they permit an electric current to flow. These are: conductors, insulators, and semiconductors. In the first category are substances which provide an easy path for an electric current. All metals are conductors, however some metals do not conduct well. Manganin, for example, is a poor conductor. Copper is a good conductor, therefore it is widely used for cables.

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  • In a field-effect transistor (FET), the width of a conducting channel in a semiconductor and, therefore, its current-carrying capability, is varied by the application of an electric field (thus, the name field-effect transistor). As such, a FET is a “voltage-controlled” device. The most widely used FETs are Metal-Oxide-Semiconductor FETs (or MOSFET). MOSFET can be manufactured as enhancement-type or depletion-type MOSFETs. Another type of FET is the Junction Field-Effect Transistors (JFET) which is not based on metal-oxide fabrication technique.

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  • There are four major categories of catastrophic failure which exists in the boiler itself. 1. Melt down. This is a result of the heating surface metal reaching its melting point. It is a result of the boiler operating on very low water conditions. This by itself will not cause an explosion but will do major damage to the boiler and create a dangerous situation which could lead to an explosion.

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  • The five elements refer to five categories in the natural world, namely wood, fire, earth, metal and water. According to the theory wood, fire, earth, metal and water are the basic substances that constitute the material world. These substances are not only of the relations with generation and restriction but set in a state of constant motion and change for example wood promotes fire, fire promotes earth, earth promotes metal, metal promotes water, and water, in turn, promotes wood.

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  • Diamonds serve two main functions today: jewelry and industrial uses. Slightly more than 50 percent of the volume of diamonds extracted becomes gemstones for jewelry, yet they account for more than 95 percent of the total value. Polished diamonds have always been considered among the world’s most precious gemstones. They account for about 40 percent of all jewelry manufacturing; engagement rings are the largest category of diamond jewelry. Jewelers usually set the diamonds in precious metals such as gold or platinum to emphasize the sparkle of the stones.

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