Abstract:
A double-gate field-effect transistor includes a substrate, an insulation film formed on the substrate, source, drain and channel regions formed on the insulation film from a semiconductor crystal layer, and two insulated gate electrodes electrically insulated from each other. The gate electrodes are formed opposite each other on the same principal surface as the channel region, with the channel region between the electrodes. The source, drain and channel regions are isolated from the surrounding part by a trench, forming an island. Gate insulation films are formed on the opposing side faces of the channel region exposed in the trench. The island region between the gate electrodes is given a width that is less than the length of the channel region to enhance the short channel effect suppressive property of structure.
Abstract:
The present invention relates to a method of manufacturing hollow ceramics fibers with the pores of the micron-scale hollow structure unidirectionally oriented, the method of manufacturing is characterized in the steps of dispersing organic fibers in a dielectric liquid and applying high voltage to the dielectric liquid containing the dispersed organic fibers to electrostatically align them to produce a fiber accumulation in which the organic fibers are unidirectionally oriented, using said fiber accumulation as a mold and dipping said fiber accumulation in a ceramics base solution, and then removing said mold by treatment with heat or organic solvents.
Abstract:
The present invention provides a novel polishing material with which silicon nitride ceramic and sialon ceramic can be polished at high efficiency through a tribochemical reaction, and a method for manufacturing thereof, said material is used for polishing a silicon nitride ceramic or sialon ceramic as a material being polished, through a tribochemical reaction, and consists of a ceramic sinter containing an element that causes the ceramic being polished to undergo a dissolution reaction at the grain boundary of the sinter, within the particles thereof, and/or in pores thereof.
Abstract:
An organometal having as molecular structural elements both a semiconductor anion atom and cation atom is applied to a substrate and reacted under heating to obtain p-type and n-type semiconductor thin films whose p-n junctions enable fabrication of a semiconductor device, light-emitting element or solar cell.
Abstract:
In an optical information medium comprising an information recording layer having a mark train of marks and spaces, the mark train is read out by scanning it with a laser beam and detecting a light intensity change pattern of reflected laser beam. Provided that the reflected laser beam includes polarized light components which define an angle null with the mark train, a polarized light component giving nullnull0 is x0 component, and a polarized light component giving nullnull90null is y0 component, the mark train is read out utilizing at least a light intensity change of x0 component. When pits or recorded marks having a size approximate to or below the resolution limit are read out, the present invention allows high read outputs to be obtained and prevents omission of readout signals.
Abstract:
The method of preparing the porous material incorporating ultrafine metal particles comprises the following steps: (1) preparing surface-protected ultrafine metal particles by reducing metal ions in the presence of molecules such as dodecanethiol molecules; (2) immersing a wet gel in a solution of the ultrafine metal particles, thus forming an ultrafine metal particle/wet gel composite in which the ultrafine metal particles are incorporated in the wet gel; and (3) drying the ultrafine metal particle/wet gel composite to form a porous body.
Abstract:
A capacitance position sensor comprises a pair of opposed tabular electrodes, an LC oscillator circuit having a toroidal core winding and whose oscillating frequency varies with change in capacitance between the pair of electrodes, and an arithmetic processing unit for calculating an absolute value of a distance between the electrodes from the oscillating frequency of the oscillator circuit. A position controller comprises a stationary member formed with one electrode of the pair of electrodes of the position sensor, a movable member on which the other electrode of the pair of electrodes is formed, and moving means for moving the movable member relative to the stationary member.
Abstract:
The present invention provides a method and apparatus mainly for measuring mechanical properties, electrical properties and transducer properties (e.g., electromechanical coupling constant) of piezoelectrics, wherein three measurement specimens of the same material and the same dimension, each having parallel planes, and two insertion plates of the same material and the same dimension, each having known mechanical properties, are stacked alternately, a load is applied to these measurement specimens and insertion plates via the measurement specimens located on both end sides, the displacements in the direction of application of the load are measured before and after application of the load, and an elastic constant of the measurement specimen is determined based on those displacements, and the measurement of the electromechanical coupling constant is applied to the piezoelectrics by using the same apparatus under short-and-open circuit conditions.
Abstract:
The present invention relates to a flammable gas detection sensor that is a gas detection sensor which converts heat generated by the catalytic reaction between the catalyst component and a flammable gas to a voltage signal by a thermoelectric conversion effect and detects this signal as a detection signal, and is characterized by comprising as constituent elements thereof a catalyst component for initiating a catalytic reaction when in contact with a gas to be detected, and a film of thermoelectric conversion material which converts local temperature differences brought about by heat generated by the reaction to voltage signal; and also relates to a flammable gas concentration measurement method and a measurement apparatus thereof.
Abstract:
This invention is a method of manufacturing oxide porous bodies and components of alumina and magnesia, using alumina and magnesia powders as raw materials, wherein (1) cold isostatic pressure (CIP) of at least 100 MPa is applied to the materials to introduce a plastic deformation with lattice disorder in the surface vicinity without external changes in the particles, (2) by sintering (calcining) the powders with the above described plastic deformation, the microscopic plastic deformation is removed and, at the same time, formation and growth of necks between grains is induced, (3) from the above described steps (1) and (2), a highly porous body with a structure constituted by a three dimensional network of grains connected through the necks is produced.