摘要:
A semiconductor cooling device includes a cold plate for cooling a semiconductor element, a condenser, and an inverter-controlled refrigerant pump, all of which are fluid connected in series with each other to define a refrigerating cycle. The semiconductor cooling device also includes a fan for cooling the condenser, a temperature detector disposed in proximity to the semiconductor element, and a controller for controlling the refrigerant pump and the fan. The controller controls the number of revolutions of the refrigerant pump and that of the fan depending on a value measured by the temperature detector.
摘要:
A heat radiator includes a heat absorbing element, a heat radiating element, and a pump connected with the heat absorbing element and the heat radiating element to define a closed circuit. The pump circulates a refrigerant through the closed circuit. The heat absorbing element includes a heat-exchanging portion for transferring heat generated by a heating element to the refrigerant, a cover joined to a peripheral edge of the heat-exchanging portion to define a refrigerant flow channel therebetween, and one or more connecting members disposed within the refrigerant flow channel and having opposite ends joined to the heat-exchanging portion and the cover, respectively, to connect the heat-exchanging portion and the cover with each other.
摘要:
This specification discloses an electrophotographic apparatus for forming an image by digital processing improved in a gradation property, provided with image data processing means for processing input image data to the apparatus body into data for forming an electrostatic latent image, electrostatic latent image forming means for effecting image exposure by digital optical means conforming to the electrostatic latent image data to thereby form the electrostatic latent image on the electrophotographic photosensitive member, and developing means for developing the electrostatic latent image with a toner to thereby form a developed image, wherein the image data processing means effects an image calculation taking into account the mutual action around a pixel constituting the electrostatic latent image in conformity with the size of the pixel when it processes the input image data into the electrostatic latent image data.
摘要:
Disclosed is a process for preparing a solid titanium catalyst component, comprising contacting (a) a liquid magnesium compound, (b) a liquid titanium compound, (c) an electron donor and (d) a solid divalent metallic halide. In this process, the solid divalent metallic halide is one having a crystalline structure of the cadmium chloride type. The contact of the component (a) with the component (b) is preferably carried out in the presence of the solid divalent metallic halide (d). According to this process, there can be obtained a solid titanium catalyst component capable of polymerizing olefins with an extremely high activity and capable of producing polyolefins of high stereoregularity when .alpha.-olefins of 3 or more carbon atoms are polymerized.
摘要:
The present invention relates to a word driver circuit provided in a memory circuit. The word driver circuit comprises a P channel and an N channel transistor having a gate electrode commonly connected and one source or drain electrode commonly connected. The N channeltransistor has another source or drain electrode connected to a ground. A word line is connected to the commonly connected source or drain electrode of the transistors. A first selection signal, generated by decoding a first group of address signals, whose potential is either a first potential by which the N channel transistor is rendered conductive or a second potential lower than the first power supply is supplied to the gate electrodes. And a second selection signal, generated by decoding a second group of address signals, whose potential is either a third potential of the selected word line or a fourth potential equal or lower than the first power supply is supplied to another source or drain of the P transistor.
摘要:
An image forming apparatus includes an electrophotographic photosensitive member; charging device for electrically charging the photosensitive member; one information light source for emitting light information to the photosensitive member, the light source being actuatable by electric power supply; light quantity control device for controlling the light source to produce a controlled quantity of light from the light source in accordance with image information; developing device for developing an electrostatic latent image formed on the photosensitive member, the developing device comprises first developing device for developing it with first toner, and second developing device for developing it with second toner having a color different from that of the first toner; wherein the control device comprises a reference current source for supplying a predetermined reference current, and a color current source for supplying currents predetermined for respective colors, and wherein in exposure for a pixel, the light source is supplied with a current which is a sum of a current from the reference current source and a current from the color current source, so that an electrostatic latent image having different potentials in accordance with colors of the image information is formed by a single image information exposure step.
摘要:
A catalyst for reducing nitrogen oxides from an exhaust gas containing the same in an oxygen rich atmosphere comprising (i) a zeolite having a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of at least 10, (ii) copper, and (iii) a rare earth ion, an alkaline earth metal and/or a valence variable metal.
摘要:
The present invention relates to solid catalyst components for olefin polymerization formed by prepolymerizing at least two types of .alpha.-olefin on an olefin polymerization catalyst comprising a solid titanium catalyst component, an organometallic compound catalyst component, and if necessary, an electron donor, to olefin polymerization catalyst comprising said solid catalyst component for olefin polymerization, an organometallic compound catalyst component, and if necessary, an electron donor, and to processes for olefin polymerization using said olefin polymerization catalyst.According to the present invention, there can be manufactured olefin polymer particles having low adhesive among the polymer particles as well as good particle distribution and excellent granular properties even when they contain a large amount of an amorphous olefin polymer portion.
摘要:
A catalyst component (X") obtained by treating an olefin polymerization catalyst (X) formed from (A) a solid titanium catalyst component comprising magnesium, titanium, halogen and an electron donor as essential ingredients, (B) an organoaluminum compound catalyst component, and as required, (C) an electron donor with an alpha-olefin by preliminarily polymerizing the alpha-olefin in an amount of 0.1 to 500 g per gram of the solid titanium catalyst component (A) in the presence of said catalyst (X), and contacting the treated catalyst (X') with at least 0.1 mole, per gram-atom of titaninum in the treated catalyst (X"), of oxygen. A process for producing the olefin polymerization catalyst component. A catalyst (Y) for olefin polymerization formed from [I] the above catalyst component (X"), [II] an organoaluminum compound catalyst component and as required [III] an electron donor. Also provided is a process for polymerizing olefins in the presence of the olefin polymerization catalyst (Y).
摘要:
An apparatus for continuously measuring temperatures of molten metal including a thermocouple unit (A) and an immersion protection tube unit (B), wherein the thermocouple unit (A) comprises a thermocouple (1) having an end equipped with a temperature sensing element (8) and an opposite end connected to terminals (2), an insulator (9) of substantially one piece containing the thermocouple (1), a porcelain protection tube (6) of high airtightness containing the insulator (9), and a terminal box (3) having an extension sleeve (5) with which the upper part of the porcelain protection tube (6) is held and having a housing (20) which contains the terminals (2). The immersion protection tube unit (B) comprises an alumina-graphite protection tube (21), a holding sleeve (22) with a flange which is connected to the upper part of the alumina-graphite protection tube (21), and a connecting sleeve (26) connected with the holding sleeve (22). The porcelain protection tube is detachably inserted into the alumina-graphite protection tube (21) to allow easy removal of the thermocouple and alumina-graphite protection tube (21). Further, the alumina-graphite protection tube (21) is manufactured by a process of adding a resin type binder which has high carbonization yield to a compounding component formed of a mixture of graphite powder, a powder selected from and/or mixed with a powder of SiC derivatives, Si derivatives, ZrO.sub.2 --SiO.sub.2 derivatives, Al.sub.2 O.sub.3 --ZrO.sub.2 --SiO.sub.2 derivatives, and a powder of substantially granular and/or powdered alumina, and then subsequently kneading the mixture, forming it into a tube and sintering the formed tube.