surface+techniques

1) Household appliances: escape depth

2) Makarov: escape depth (напр. электронов), escape depth (for surface analysis techniques) (для методов анализа ПВ)

 In his experiments young seedings were used where both the relative growth rate and ion fluxes at the root surface would have been greater than in the tillers used in our experiments.

 In agreement with L. [...] we did not find evidence of any crossover temperature beyond which NO3- uptake exceeded NH4+, such as was found in lettuce.

 The separation of the light components is as good as with the store column.

 There are certain drawbacks to these techniques.

SUBJECT AREA: Recording

[br]

[br]

[br]

He was a nobleman and an Italian cavalry lieutenant and went to the USA, where he married Daisy Abbott (of Stamford, Connecticut). From 1888 he made amateur recordings of a wide circle of artistic acquaintances and improved the recording diaphragm attachment by the development of a "spider" (a mechanical link that attacks the diaphragm in several points on its surface, rather than in the centre only). From 1892, through the Bettini Phonograph Laboratories, he published recordings of operatic artists and selections, and this led to the development of improved duplicating techniques by the so-called pantographic method. In 1901 he sold his US company and moved to Paris, although he continued to publish both cylinders and discs. In 1908 Bettini made a venture into cinematography, without success.

[br]

SUBJECT AREA: Paper and printing

[br]

[br]

[br]

Soon after his birth, Senefelder's family moved to Mannheim, where his father, an actor, had obtained a position in the state theatre. He was educated there, until he gained a scholarship to the university of Ingolstadt. The young Senefelder wanted to follow his father on to the stage, but the latter insisted that he study law. He nevertheless found time to write short pieces for the theatre. One of these, when he was 18 years old, was an encouraging success. When his father died in 1791, he gave up his studies and took to a new life as poet and actor. However, the wandering life of a repertory actor palled after two years and he settled for the more comfortable pursuit of playwriting. He had some of his work printed, which acquainted him with the art of printing, but he fell out with his bookseller. He therefore resolved to carry out his own printing, but he could not afford the equipment of a conventional letterpress printer. He began to explore other ways of printing and so set out on the path that was to lead to an entirely new method.

He tried writing in reverse on a copper plate with some acid-resisting material and etching the plate, to leave a relief image that could then be inked and printed. He knew that oily substances would resist acid, but it required many experiments to arrive at a composition of wax, soap and charcoal dust dissolved in rainwater. The plates wore down with repeated polishing, so he substituted stone plates. He continued to etch them and managed to make good prints with them, but he went on to make the surprising discovery that etching was unnecessary. If the image to be printed was made with the oily composition and the stone moistened, he found that only the oily image received the ink while the moistened part rejected it. The printing surface was neither raised (as in letterpress printing) nor incised (as in intaglio printing): Senefelder had discovered the third method of printing.

He arrived at a workable process over the years 1796 to 1799, and in 1800 he was granted an English patent. In the same year, lithography (or "writing on stone") was introduced into France and Senefelder himself took it to England, but it was some time before it became widespread; it was taken up by artists especially for high-quality printing of art works. Meanwhile, Senefelder improved his techniques, finding that other materials, even paper, could be used in place of stone. In fact, zinc plates were widely used from the 1820s, but the name "lithography" stuck. Although he won world renown and was honoured by most of the crowned heads of Europe, he never became rich because he dissipated his profits through restless experimenting.

With the later application of the offset principle, initiated by Barclay, lithography has become the most widely used method of printing.

[br]

 

трансформатор с литой изоляцией
Сухой трансформатор, в котором основной изолирующей средой и теплоносителем служит электроизоляционный компаунд.
[ ГОСТ 16110-82]

[http://www.rospol-electro.ru/production_transformers_resin.htm]
Трансформатор с литой изоляцией (без кожуха):

1 - Выводы низшего напряжения; 2 - Подъемные петли; 3 - Коробка для подключения датчиков температуры; 4 - Заводская табличка; 5 - Стержень (часть магнитной системы); 6 - Обмотки высшего напряжения (Обмотки низшего напряжения не видны, они находятся "под" обмотками высшего напряжения. Все обмотки являются концентрическими, т. е. выполнены в виде цилиндров и концентрически расположегы на стержне магнитной системы); 7 - Выводы высшего напряжения (перемычки соединяют обмотки высшего напряжения по схеме "треугольник"); 8 - Устройство переключения ответвлений обмоток для изменения коэффициента трансформации; 9 - Платформа для перемещения.

Параллельные тексты EN-RU

Cast resin transformers
Dry-type transformers, with one or more enclosed windings, are usually called cast resin transformers.
These types, due to developments in construction techniques, are more and more widely used because of their reliability, their lower environmental impact compared to oil transformers, and because they reduce the risks of fire and spreading polluting substances in the environment.
Medium-voltage windings, made with wire coils or, even better, insulated aluminium strips, are placed in a mould into which the epoxy resin is poured under vacuum, to avoid inclusions of gas in the insulation.
The windings are then enclosed in a cylindrical enclosure, which is totally sealed, mechanically strong and has a smooth surface which impedes both the deposit of dust and the action of polluting agents.
Low-voltage windings are generally made of a single aluminium sheet, the same height as the coil, insulated by suitable material and heat treatment.
Cast resin transformers use class F 155°C insulating material, allowing for a maximum temperature rise of 100°K.
[Legrand]

Tрансформаторы с литой изоляцией
Сухие трансформаторы с одной или несколькими обмотками, залитыми компаундом, называют трансформаторами с литой изоляцией. Благодаря постоянному совершенствованию конструкции трансформаторы данного типа находят все более широкое применение, поскольку обладают высокой надежностью и более низким, по сравнению с масляными трансформаторами, воздействием на окружающую среду, а также меньшей опасностью возгорания и отсутствием выделения загрязняющих веществ в окружающее пространство.
Обмотки среднего (высшего) напряжения изготавливают из провода или, что еще лучше, из изолированной алюминиевой шины. Такие обмотки помещают в форму, в которую после вакуумирования подают эпоксидную смолу. Данная технология исключает наличие газа в изоляции. Затем обмотки помещают в герметичную механически прочную цилиндрическую оболочку с гладкой ровной поверхностью, предотвращающей скапливание пыли и загрязняющих веществ, оказывающих отрицательное воздействие.
Обмотки низшего напряжения, как правило, изготавливают из алюминиевой полосы такой же высоты, что и высота обмотки высшего напряжения. Обмотки низшего напряжения изолируют соответствующим материалом и подвергают тепловой обработке. Применяемая в трансформаторах в качестве изоляционного материала эпоксидная смола имеет класс нагревостойкости F, что соответствует температуре 155 °С. Это означает, что в процессе эксплуатации трансформатора допускается превышение температуры обмоток на 100 К.
[Перевод Интент]

Тематики

• трансформатор

Классификация

>>>

EN

• cast resin transformer