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 Electron Trapping in Polyethylene. A molecular modelling study of space charge in the polymeric insulation of high voltage cables
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Electron Trapping in Polyethylene. A molecular modelling study of space charge in the polymeric insulation of high voltage cables

автор Marc M. издательство Книга по Требованию Физическая химия
Cтраниц 232        мягкая обложка       
Аннотация:A direct link between molecular properties, space charge formation and eventual breakdown has still to be established. Conformational defects in these waxy materials are predicted to produce shallow traps with energies below 0. 3 eV, their density is estimated, and the residence time of electrons is such traps is of the order of a few picoseconds. The goal is to understand the role of defects at the molecular level in electron trapping and the formation of space charge in polyethylene. The analysis suggests that by defining the defect energy in terms of the molecular electron affinity, a relationship is established between the electron trap and the molecular properties of the material. A new scheme that constitutes a first step in linking microscopic defects to the formation of space charge is suggested. The presence of space charge in the polymeric insulation of high voltage cables is correlated with electric breakdown.
Автор: Marc M.
Издательство: Книга по Требованию
Год:2009
Цена:
3190 руб
Нет в наличии
Поиск: Electron Trapping in Polyethylene. A molecular modelling study of space charge in the polymeric insulation of high voltage cables
НОВЫЙ ГОД СИМВОЛ 2013 ГОДАУКРАШЕНИЯ
КАРНАВАЛ НА НОВЫЙ ГОД РАСПРОДАЖА
Ортомолекулярная медицина Orthomol Устрание причин заболеваний. Ортомоль это новый метод для лечения и профилактики болезней. Orthomol - ортомолекулярная медицина.
Эффект Ганна и его использование, в диодах, работающих в генераторном...

При этом ток достигает максимального значения, равного (рис.4, в) (2) Такой режим работы диода Ганна называют пролетным режимом. В пролетном режиме ток через диод представляет собой импульсы, следующие с периодом . Диод генерирует СВЧ-колебания с пролетной частотой , определяемой в основном длиной образца и слабо зависящей от нагрузки (именно такие колебания наблюдал Ганн при исследовании образцов из GaAs и I Р). Электронные процессы в диоде Ганна должны рассматриваться с учетом уравнений Пуассона, непрерывности и полной плотности тока, имеющих для одномерного случая следующий вид: ;(3) .(4) Рис.4. Эквивалентная схема генератора на диоде Ганна (а) и временные зависимости напряжения (б) и тока через диод Ганна в пролетном режиме (в) и в режимах с задержкой (г) и гашением домена (д). Мгновенное напряжение на диоде . Полный ток не зависит от координаты и является функцией времени. Часто коэффициент диффузии считают не зависящим от электрического поля. В зависимости от параметров диода (степени и профиля легирования материала, длины и площади сечения образца и его температуры), а также от напряжения питания и свойств нагрузки диод Ганна, как генератор и усилитель СВЧ-диапазона, может работать в различных режимах: доменных, ограничения накопления объемного заряда (ОНОЗ, в иностранной литературе LSA–Limi ed Space Charge Accumula io ), гибридном, бегущих волн объемного заряда, отрицательной проводимости.
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