Thin film of tellurium was prepared by chemical vapour deposition on the polyethylene foils using room-temperature decomposition of electrochemically generated hydrogen telluride.

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According to the requirement of oil drilling foreign and domestic, the international standard for oil equipment and national oil drilling codes. In order to prevent fault which flaming gas or vapour may be present in the air in sufficient quantities to be explosive or ignitable. We designed and made explosion-proof electric controlling equipment for oil field.

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Maximum gap of the joint between the two parts of the interior chamber of a test apparatus which,when the internal gas mixture is ignited and under specified conditions,prevents ignition of the external gas mixture through a 25 mm long joint,for all concentrations of the tested gas or vapour in air.

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Maximum gap of the joint between the two parts of the interior chamber of a test apparatus which,when the internal gas mixture is ignited and under specified conditions,prevents ignition of the external gas mixture through a 25 mm long joint,for all concentrations of the tested gas or vapour in air.

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Maximum gap of the joint between the two parts of the interior chamber of a test apparatus which,when the internal gas mixture is ignited and under specified conditions,prevents ignition of the external gas mixture through a 25 mm long joint,for all concentrations of the tested gas or vapour in air.

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It includes the main propulsion plant, management of power station , ship control system,remote control of valves and measurement of tank level,cargo oil pump controlled by converter,heating monitoring of cargo oil tanks and reclaim monitoring of poisonous vapour.

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Ionic liquid has intrinsically useful properties, such as thermal stability, lower melting point, negligible vapour pressure, acidity changeable and highly solvating, low viscosity and density.

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