Abstract: Disclosed herein is a sintered silicon carbide composite prepared by sintering a blend comprising from 25 to 85% by weight of silicon carbide, from 1 to 25% by weight of at least one of chromium and chromium compound, from 10 to 70% by weight of at least one of carbide, nitride and boride of elements belonging to the groups IVb and Vb of the periodical table, and from 3 to 25% by weight of aluminum oxide, in an inert gas atmosphere at a temperature from 1700.degree. to 2100.degree. C.

Abstract: A semiconductor memory device is provided with memory cells each having a capacitor for accumulating an electric charge and a transistor for charging and discharging the capacitor. The memory device comprises a substrate, an insulator layer formed thereon and a monocrystalline semiconductor layer formed thereon. The capacitor is composed of said monocrystalline semiconductor layer, the insulator layer and the substrate while the transistor is formed in the monocrystalline semiconductor layer.

Abstract: A camera having a television mode has a shutter unit for opening and closing a plurality of shutter blades used as a shutter and a diaphragm by rotating a step motor in normal and reverse directions; a photometric device for performing a photometric operation with respect to a photographed object; a mode switching device for selectively switching a television mode for photographing a picture image on a television screen and a normal mode for performing a normal photographing operation; a trigger switch for outputting an open signal in synchronization with an operation for opening the shutter blades and outputting a closed signal in synchronization with an operation for closing the shutter blades; and a calculator for calculating an exposure amount by photometric information provided by the photometric device when the normal photographing mode is selected by the mode switching device.

Abstract: Carbon fibers with a large specific surface area are obtained by a process which comprises the steps of:(a) providing cured novolak resin fibers;(b) impregnating the novolak resin fibers with a polymerizable vinyl monomer;(c) polymerizing the vinyl monomer; and(d) carbonizing the novolak resin fibers containing the polymerized vinyl monomer.

Abstract: A synthetic peptide of the formula: H-.sub.D -A.sub.1 -Leu-Lys-NH ##STR1## wherein A.sub.1 is Pro or Ala, is excellent in solubility in water and substrate specificity and is suitable as a substrate for determining trypsin and .alpha..sub.1 -antitrypsin.

Abstract: A process for the production of porous phenolic resin fibers is disclosed, which process comprises graft-polymerizing to phenolic resin fibers a vinyl group-containing monomer capable of forming a thermally decomposable polymer, and thereafter subjecting the fibers to a heat treatment at a temperature high enough to cause thermal decomposition of the graft polymer. The product thus obtained is excellent in heat-resistance and adiabatic property in addition to useful properties inherent to phenolic resin fibers.

Abstract: A process for preparing an optically active 3-chloro-1, 2-propanediol by employing microorganism which can selectively metabolize (R)- or (S)-3-chloro-1,2-propanediol. The decomposition rate of the substrate can be accelerated and the substrate concentration can be increased by adding a compound having SH group to the reaction solution.According to the process of the present invention, the optically active 3-chloro-1,2-propanediol can be easily prepared starting from low-cost (R,S)-3-chloro-1, 2-propanediol.

Abstract: An infrared remote control toy which needs a small amount of motor starting current includes a logic IC and a motor drive circuit consisting of four transistors connected in the form of a bridge, in which the bases of the third and fourth transistors are connected to the first and second junctions of the bridge.

Abstract: A process for preparing optically active indoline-2-carboxylic acid by an optical resolution, which comprises subjecting a racemic ester of (R,S)-indoline-2-carboxylic acid having the general formula [(R,S)-I] to the action of an enzyme or a microorganism having a stereo-selective esterase activity, which is capable of asymmetrically hydrolyzing the racemic ester [(R,S)-I] to give optically active indoline-2-carboxylic acid having the formula [II*] so as to produce the hydrolysis product, i.e. optically active indoline-2-carboxylic acid [II*] and an unreacted optically active ester of indoline-2-carboxylic acid having the general formula [I*], isolating each optically active form, and further, if necessary, hydrolyzing the obtained optically active ester [I*] to give an optical antipode of the acid [II*].According to the process of the present invention, optically active indoline-2-carboxylic acid with a high optical purity can be prepared in a simple process with a good yield.

Abstract: A synthetic peptide of the formula: ##STR1## wherein A.sub.1 is Pro or Ala, is excellent in solubility in water and substrate specificitity and is suitable as a substrate for determining trypsin and .alpha..sub.1 -antitrypsin.

Abstract: A method of manufacturing a substrate of a GaAs compound semiconductor is disclosed, which is characterized in that, after a crystal of GaAs compound semiconductor obtained by the liquid encapsulated Czocharalski method is annealed in the form of ingot, gradually cooled to room temperature and cut off in the form of a wafer, a re-heating treatment consisting of heating to a temperature of not lower than 700.degree. C., rapid cooling from the temperature of not lower than 700.degree. C. to a temperature of not higher than 400.degree. C. within 30 minutes and successive cooling to room temperature is given to the wafer, and then mirror polishing is performed.

Abstract: In a photoelectric converting apparatus having a plurality of photosensors divided into an opening portion and a light shielding portion, a carrier eliminating structure to block the inflow of photosignals from the opening portion is provided between the photosensor in the light shielding portion and the photosensors in the opening portion. The photosensor comprises of a photoelectric converting transistor having a control electrode region to accumulate the carriers generated by the light excitation. The carrier eliminating structure has the same constitution as that of the photosensor. The potential of the control electrode region is fixed to a constant potential so as to attract the carriers from the opening portion.

Abstract: A sensor device for cumulatively storing incident light in the form of electric charge is arranged to monitor the level of the cumulatively stored electric charge; to have one mode in which the storing action is allowed to continue until the electric charge level reaches a first, high given level if the electric charge level reaches a preset level within a given period of time; to have another mode in which the storing action is allowed to continue until the electric charge level reaches the preset level if the electric charge fails to reach the preset level within the given period of time; and to cause a signal obtained by the storing action to be read out after the end of the storing action with a degree of gain which is variable according to the mode in which the storing action is performed.

Abstract: There is a photoelectric converting apparatus having a photoelectric converting cell of the type in which by controlling the potential of a control electrode region of a semiconductor transistor, the carriers generated in the control electrode region by the light excitation are accumulated, and the accumulation voltage generated by this accumulation is read out from one of the main electrode regions of the semiconductor transistor. The control electrode region is connected to an excess carrier eliminating circuit to perform the switching operation in dependence on the potential difference across the control electrode region.

Abstract: Novel compounds represented by the following general formula (1) and salts thereof: ##STR1## wherein n represents an integer of 3 to 4, R.sup.1 represents ##STR2## or --SO.sub.2 R.sup.2, and R.sup.2 represents optionally branched lower alkyl group having 1 to 6 carbon atoms, phenyl group, benzyl group or tolyl group, which are useful as substrate for use in the measurement of biological components; a substrate for use in the measurement of biological component which comprises said novel compound or salt thereof; and a method for measuring biological component which comprises using said substrate.

Abstract: A photoelectric conversion device includes a first main electrode region of a first conductivity type; a second main electrode region of a first conductivity type; a control electrode region of a second conductivity type opposite to the first conductivity type serving as an accumulation region for carriers induced by an electromagnetic wave; a first circuit for setting the control electrode region selectively at a constant potential and at a floating state; and a second circuit for setting the first main electrode region selectively at a low impedance state and at a floating state; whereby the first and second circuits control the carrier removal, accumulation and readout operations in accordance with the selection conditions by the first and second circuits.

Abstract: A semiconductor device comprises two main electrode regions, i.e., cathode and anode regions consisting of high impurity concentration regions of opposite conductivity types, a low impurity concentration region locally formed between the two main electrode regions, a gate region, formed near the cathode region, for controlling a main current, a first local region which has a relatively low carrier lifetime and is formed in a region of the low impurity concentration region near at least one of the gate and cathode regions, and a second local region which has a relatively low carrier lifetime and is formed in a region of the low impurity concentration region which is depleted at the end of the main current turn-off process or which is not depleted to the end, thus satisfying three conditions, i.e., high-speed switching, low forward voltage drop, and high blocking voltage between the main electrodes at the same time.

Abstract: In a semiconductor apparatus for controlling a large current at a high speed, a lead conductor coupled to a control electrode of a semiconductor device sealed in a package comprises a conductor plate having a width equal to or greater than one side or a diameter of the semiconductor device, thereby decreasing impedance against a high-frequency input signal.

Abstract: In a 3-terminal package sealed semiconductor device such as a transistor or a thyristor, an insulator formed between the respective lead conductors is made of alumina ceramic. An electrode conductor base (one of the lead conductors) for mounting a semiconductor device thereon is made of a copper-tungsten sintered alloy containing 2% by volume to 48% by volume of copper. The thermal expansion coefficient of the insulator becomes substantially the same as that of the electrode conductor base, thereby elmininating a conventionally used intermediate damping member and hence providing a compact semiconductor apparatus which has a high packaging density and which can switch a large current at high speed. The respective lead conductors have predetermined sizes to achieve high-speed large-current switching.

Abstract: A novel chromogenic and fluorescent substrate for measuring the concentration of kallikrein in urine. The novel substrate according to the present invention has very excellent substrate specificity to kallikreins and good solubility in water or biological test solutions.The present substrate is therefore useful for measuring the concentration of kallikrein in urine for the diagnosis of hypertension and other diseases caused by the lowering of the concentration of kallikrein.