摘要:
A silicon nitride sintered material includes a polycrystal material having silicon nitride crystal grains and a grain boundary phase. The sintered material contains a Yb element in an amount of 2 to 30% by weight in terms of its oxide and an Al element in an amount of 1 to 20% by weight in terms of its oxide and has a thermal conductivity of 40 W/mK or less at room temperature, a resistivity of 1×105to 1×1012 &OHgr;·cm at room temperature, and a porosity of 0.5% or less.
摘要:
A laminated radiation member includes a radiation plate, an insulation substrate bonded to the upper surface of the radiation plate and an electrode provided on the upper surface of the insulation substrate. The laminated radiation member is made by a method including the steps of surface treating a bonding surface of the radiation plate and/or the insulation substrate, interposing ceramic particles surface treated to assure wettability with a hard solder or a metal between the radiation plate and the insulation substrate, disposing a hard solder above and/or below the ceramic particles, heating the hard solder to a temperature higher than the melting point of the solder, penetrating the molten hard solder into spaces between the ceramic particles to react the ceramic particles with the solder to produce a metal base composite material, and bonding the radiation plate and the insulation substrate with the metal base composite material.
摘要:
A method of producing the silicon nitride sintered body includes the steps of forming a compact of molding materials including silicon nitride powder, a Mg component and a sintering aid, and sintering the molding materials at 1,800 to 2,000° C. under a nitrogen atmosphere. The materials at least include an oxide of Mg in a range of 0.3 to 10 wt. %. A constant temperature is kept for at least 0.5 hours in a temperature range of 1,400 to 1,700° C. before the temperature is increased to the sintering temperature. A silicon nitride body having high thermal conductivity and excellent electrical insulation properties at high temperature can thus be provided.
摘要:
The invention provides a semiconductor device, having a variety of functions such as a bistable memory and a logic circuit, in which a MOS semiconductor element, a resonance tunnel diode, a hot electron transistor and the like are formed on a common substrate. An n-type Si layer and a p-type Si layer surrounded with an isolation oxide film are formed on an SOI substrate. A mask oxide film and a gate oxide film are formed, and the n-type Si layer is subjected to crystal anisotropic etching by using the mask oxide film as a mask, so as to change the n-type Si layer into the shape of a thin Si plate. After first and second tunnel oxide films are formed on side faces of this n-type Si layer, first and second polysilicon electrodes of a resonance tunnel diode and a polysilicon electrode working as a gate electrode of a MOS semiconductor element are formed out of a common polysilicon film. Thus, a Si/SiO2 type quantum device can be manufactured with ease at a low cost.
摘要:
A novel primary or secondary battery whose active material for the negative electrode is composed of metallic gallium, gallium alloys or gallium oxide has first come into the world.Gallium has an electrochemical equivalent of 23.24, which is smaller than those of zinc (32.70) and cadmium (56.21). This indicates that when used as an active material for the negative electrode in batteries, gallium has larger capacity per unit mass than zinc and cadmium by respective factors of ca. 1.4 and 2.4. The potential of the reaction; Ga+6OH.sup.- =GaO.sub.3.sup.3- +3H.sub.2 O+3e.sup.- is obviously less noble than the voltage of hydrogen evolution and this means that a high-potential battery can be made. Due to the high hydrogen overvoltage of gallium, gallium ions in the solution can be precipitated as metallic gallium by electrodeposition. As a further advantage, no dendrite formation occurs during the electrodeposition unlike in the case of zinc. The high hydrogen overvoltage also contributes to the production of a battery that undergoes only limited self-discharge. What is more, gallium which has no toxicity presents few environmental problems.
摘要:
There are disclosed a method for separating a liquid mixture in which a permeation performance enhances, and a composition of the liquid mixture containing a hydrocarbon liquid and an alcohol liquid at supply and a composition after membrane permeation are changed by a separating operation, and a device for separating a liquid mixture. The liquid mixture containing the hydrocarbon liquid and the alcohol liquid is used as a supply mixture liquid, and at least part of the supply mixture liquid is, in a liquid state, brought into contact with a membrane supply side of a separation membrane, and discharged in a vapor state through a membrane permeation side of the separation membrane, whereby a composition of a mixture vapor which is balanced with the supply mixture liquid becomes different from a composition of a vapor on the membrane permeation side.
摘要:
There is provided a zeolite membrane which is thinner than a conventional membrane and which has improved permeability and a method for manufacturing the zeolite membrane. The method includes a surface layer forming step for forming a surface layer by attaching a low polar polymer on a first surface of a porous substrate to cover the surface, a filling step for filling a masking polymer into pores in the porous substrate from a surface different from the first surface of the porous substrate up to the surface layer by impregnating the porous substrate with the masking polymer and solidifying the masking polymer, and a surface layer removing step for removing the surface layer. After the surface layer removing step, a zeolite membrane is formed on the first surface of the porous substrate.
摘要:
A My Page management server is a server that provides a personal world wide web (WWW) page named My Page for a user who has been registered as a member. The My Page management server includes a product registration unit that acquires information of a product which the user purchased, a link generation unit that generates, on the My Page, a link indicator which is linked to a product questionnaire about the product which the user purchased, based on the acquired information of the product, and a product questionnaire management unit that presents the linked product questionnaire to the user upon receiving a request for the product questionnaire from the user.
摘要:
A beam splitter for a digital camera splits light passed through a photographing lens into beams directed to a CCD and a finder optical system. The beam splitter includes at least one optical element provided with a beam splitting surface that is inclined with respect to an optical axis of the photographing lens, and a multi-layer film including a plurality of layers of dielectric materials is formed on the beam splitting surface. The multi-layer film is configured such that the beam splitting surface exhibits a substantially constant reflectivity at least for visible light that is incident on the beam splitting surface at any incident angle within a predetermined range.
摘要:
The invention provides a semiconductor device, having a variety of functions such as a bistable memory and a logic circuit, in which a MOS semiconductor element, a resonance tunnel diode, a hot electron transistor and the like are formed on a common substrate. An n-type Si layer and a p-type Si layer surrounded with an isolation oxide film are formed on an SOI substrate. A mask oxide film and a gate oxide film are formed, and the n-type Si layer is subjected to crystal anisotropic etching by using the mask oxide film as a mask, so as to change the n-type Si layer into the shape of a thin Si plate. After first and second tunnel oxide films are formed on side faces of this n-type Si layer, first and second polysilicon electrodes of a resonance tunnel diode and a polysilicon electrode working as a gate electrode of a MOS semiconductor element are formed out of a common polysilicon film. Thus, a Si/SiO.sub.2 type quantum device can be manufactured with ease at a low cost.