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In this paper, a method of sensor less best exciting in towards polarity by stator-electricity of synchronous motor is presented on the base of calculated best exciting time through simulation in order to solve the present problems and enhance the reliability of excitation exist in asynchronous starting of synchronous electrical machine. Detect and analyze the wave of stator current to catch the best...
Insulation is deteriorated gradually and leads to failure because itpsilas often exposed in the electric field, moisture, high temperature, mechanical stress and so on. Lifetime models study of electrical insulation is always a hot topic studied by researchers all over the world. In this paper, firstly, we reviewed some of the insulation life models used currently. And then an electrical-thermal aging...
In human and animal cells, Se plays an essential role in antioxidation and exerts an antiaging function but it is toxic at high dietary intake. To increase its intake in forage and foodstuffs, Se fertilization is adopted in some countries where soils are low in bioavailable Se, even though higher plants are regarded not to require Se. To test its ability to counteract senescence-related oxidative...
Selenium is an essential element for antioxidation reactions in human and animals. In order to study its biological role in higher plants, ryegrass (Lolium perenne) was cultivated in a soil without Se or amended with increasing dosages of H2SeO4 (0.1, 1.0, 10.0 and 30.0 mg Se kg−1). Ryegrass was harvested twice and the yields were analyzed for antioxidative systems and growth parameters. Selenium...
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