Abstract: A porous plate-shaped filler of the present invention is a plate shape having an aspect ratio of 3 or more, a surface shape is one of a round shape, an oval and a round-corner polygonal shape, and its minimum length is from 0.1 to 50 ?m. Furthermore, a sectional shape is one of an arch shape, an elliptic shape, and a quadrangular shape in which at least a part of corners is rounded. Consequently, it is possible to obtain the heat insulation film in which the porous plate-shaped fillers 1 are easy to be laminated and the heat insulation effect improves.

Abstract: A composite substrate includes a polycrystalline ceramic substrate, a silicon substrate directly bonded to the polycrystalline ceramic substrate, a seed crystal film formed on the silicon substrate by vapor phase process and made of a nitride of a group 13 element, and a gallium nitride crystal layer grown on the seed crystal film by flux method.

Abstract: There is disclosed a honeycomb structure which solves a problem of antinomy that it is difficult to satisfy both of a high temperature rise performance and a high thermal capacity at the same time and which is disposed at a previous stage of a filter for trapping particulate matters (PM) discharged from a diesel engine so that regeneration of the PM trapped by the filter can smoothly be completed and an exhaust gas can efficiently be purified. In a honeycomb structure in which a plurality of cells arranged in parallel with one another to communicate between two end surfaces of the honeycomb structure are formed by a plurality of partition walls, the plurality of partition walls are made of a ceramic, each cell is formed into a substantially square shape, an intersection between the partition walls is formed into an R-shape or a C-shape, a value (L/T) of a ratio of a diagonal distance L between the intersections to an average thickness T of the partition walls is set to 1.

Abstract: A normally-off operation type HEMT device excellent in characteristics can be realized. A two-dimensional electron gas region is formed in a periphery of a hetero-junction interface of a base layer and a barrier layer, so that access resistance in an access portion, that is, between a drain and a gate and between a gate and a source is sufficiently lowered, and at the same time, a P-type region is formed immediately under the gate. This realizes a normally-off type HEMT device having a low on-resistance. Further, when a film thickness of an insulating layer is defined as t (nm) and a relative permittivity of a substance forming the insulating layer is defined as k, a threshold voltage as high as +3 V or more can be attained by satisfying k/t?0.85 (nm?1).

Abstract: A method of manufacturing a sintered body is provided. A molding powder, a gel-forming material powder and a solvent are mixed at a temperature not higher than a dissolving point of the gel-forming material. A treatment of pulverizing agglomerates containing the molding powder, gel-forming material powder and solvent absorbed in the gel-forming material powder is carried out. The mixture is then heated to a temperature not lower than the dissolving point thereby forming a sol. The sol is then cooled to a temperature not higher than the gel point, thereby forming a molding material. The molding material is used for producing a sintering body.

Abstract: An object of the invention is to provide an electrode system for optical modulation of an optical modulator to reduce a thickness “E” of an electrode required for velocity matching and for reducing a propagation loss in the electrode. A substrate 2 is made of an electrooptic material and has one and the other main faces 2a, 2b opposing each other. An electrode system 20A is provided on the substrate 2 for applying a voltage for modulating light propagating in optical waveguides 6A and 6B. The electrode system 20A includes ground electrodes 3A, 3B and a signal electrode 4. A ratio “W/G” of a width “W” of the signal electrode 4 to a gap “G” between the ground and signal electrodes is 0.8 or higher. Preferably, the substrate 2 has a thickness “T” of 20 &mgr;m or larger, in a region where the optical waveguides 6A and 6B are provided.

Abstract: A film structure including a silicon carbide film formed on a surface of an aluminum nitride substrate. The substrate has a first base plane, a second base plane positioned downward with respect to the first base plane and a step plane arranged in an intersecting direction between the first base plane and the second base plane. One or more chamfered planes are arranged between the first base plane and the step plane so as to form a plurality of corner portions each having an angle larger than 130°. Alternatively, at least one round portion having a curvature radium of larger than 0.05 mm is arranged between the first base plane and the step plane.

Abstract: A polarizable electrode for use in an electrical double layer capacitor, which includes carbon fine-powders, a conductive auxiliary agent, and a binder. The tensile strength of the polarizable electrode is not less than 0.13 MPa. An amount of carbon particles displaced from the polarizable electrodes into an electrolytic solution in the electrical double layer capacitor is not more than 1.0 mg/cm2. The long-term performance degradation and self-discharge caused energy losses of the electrical double layer capacitor can be reduced.

Abstract: In a semiconductor light-emitting element, an underlayer is composed of a high crystallinity AlN layer having a FWHM in X-ray rocking curve of 90 seconds or below, and a first cladding layer is composed of an n-AlGaN layer. A light-emitting layer is composed of a base layer made of i-GaN and plural island-shaped single crystal portions made of i-AlGaInN isolated in the base layer.

Abstract: A ceramic envelope for high intensity discharge lamp comprises: a cylindrical barrel section 1 that forms an electric discharge light emitting space; annular closing sections 2, 2 that close both ends of the barrel section 1, respectively; and capillary sections 3, 3 that insert and fix an electric discharge electrode to be outwardly protruded so as to be opposed to each other from the substantial center of both of the closing sections. The envelope essentially consists of alumina, and is formed to have light transmission properties by adding MgO. Then, the thickness of the barrel section at the boundary between the barrel section 1 and the closing section 2 is formed to be increased in thickness by providing a tapered section 4a to the thickness in the vicinity of the center of an electric discharge light emitting space.

Abstract: The object is to provide a laminated radiation member and a power semiconductor apparatus in which no cracks occur due to thermal stress caused by cooling and thermal cycle and which are low in thermal resistance.

Abstract: A magnetic-drive device used for rotary machines, having a high torque transmitting efficiency, causing little temperature elevation of treated fluids and exhibiting mechanical strength and thermal shock resistance. The device comprises a chamber formed by combining a front casing with a rear casing to accommodate a rotor supporting a driven magnet. The rear casing consists of a cylindrical partition walled up at its one end with a bottom portion and provided with a flange portion on the other end, which partition having a thickness of 1.5-8 mm and consisting of a ceramic material having a specific resistance of at least 10.sup.7 .OMEGA.-cm. A driving magnet arranged outside the partition is magnetically coupled with the driven magnet through the partition.

Abstract: An automatic chamfering machine for ceramic honeycomb structural bodies and the like workpieces is disclosed, and includes a clamping device by which a workpiece is clamped and caused to rotate in one direction. The movement of a grinder wheel with respect to the workpiece is controlled by a tracer element urged against the other peripheral surface of the workpiece itself, so as to carry out an autoprofiling chamfering operation. The grinder wheel thus removes a constant amount of material from the workpiece even when the workpiece has an irregular outer contour, or is clamped inaccurately.

Abstract: The disclosed polycrystalline transparent sintered body contains Al.sub.2 O.sub.3 and MgO at a molar ratio of (0.54:0.46) to (0.58:0.42) and has in-line transmittance of more than 77% for 1 mm thickness at a light wavelength of 0.6 .mu.m, which sintered body is produced by preparing fine spinel powder through hydrolysis of an isopropanol solution of aluminum isopropoxide and magnesium isopropoxide, forming a shaped body from the powder, and sintering the shaped body.

Abstract: A ball and socket type suspension insulator, wherein the radius of curvature at the fillet portion between the shank portion and a ball portion of a ball pin buried and secured into the inside of a head portion of an insulator body is designed at 30-40% of the diameter of the pin shank portion, and the angle which a contact surface between the socket portion of the cap attached to the outer surface of the head of the insulator body and the ball pin forms with respect to the horizontal plane is 38.degree.-45.degree..

Abstract: An open fuse cutout has a built-in lightning arrester. A supporting insulator has an attachment hole extending substantially perpendicularly to the axis thereof with the lightning arrester element fixedly fitted in the attachment hole. The lightning arrester element has a charging electrode held in abutment against either one of upper and lower electrodes, and a grounding electrode confronting a grounding member across a spark gap.