摘要:
In a superconductor mixer, a non-linear element is provided on a substrate. The non-linear element comprises at least one Josephson junction connected in series. An antenna pattern of superconductor, an intermediate frequency output pattern of superconductor, and a bias current pattern of superconductor are connected to the non-linear element. A signal high frequency wave (RF) and a local reference frequency wave (LO) are received by the antenna pattern and then absorbed in the non-linear element to obtain an intermediate frequency (IF) signal. Then, with applying a current to the series connected Josephson junction in the non-linear element from the bias current pattern, the intermediate frequency (IF) signal as a frequency signal of a difference between the signal high frequency wave (RF) and the local reference frequency wave (LO) is output to the intermediate frequency output pattern. At this time, by varying the current supplied from the bias current pattern, a phase of the output intermediate frequency (IF) signal is varied.
摘要:
The invention provides a wide frequency band high temperature superconductor mixer antenna which allows a superconductor feed line, which exhibits a high resistance loss in a high frequency region, to be used in a low frequency region with a low loss and which is provided with a same structure as a mixer which has a wide band twice or more the frequency of a millimeter or more wave while keeping a characteristic of a high integration array antenna, which makes most of the high integrity of superconductor feed lines. The wide frequency band high temperature superconductor mixer antenna includes one or a plurality of planar structure antenna patterns of the log-periodical type or the log-spiral type and a plurality of oxide superconductor thin film feed line wiring patterns formed on a same face of a main surface of a substrate, a central portion of each of the planar structure antenna patterns being formed from an oxide superconductor thin film on which a non-linear element part is provided.
摘要:
A dental handpiece holder adapted such that the length of the handpiece holder for holding and accommodating a dental handpiece is shortened in the axial direction, whereby the main unit of the handpiece can be attached to and detached from the joint section of the handpiece for the purpose of replacement with one hand of an operator. Also a dental treatment assembly by use of the holder.The handpiece holder comprising a gutter-shaped receiving seat, first and second grip sections extending from both side fringes of the receiving seat, contact sections formed at the leading ends of the first and second grip sections respectively and an engagement groove or projection extending across the contact sections or the peripheral areas thereof in the internal circumferential direction of the grip sections.
摘要:
An information storage medium comprises a substrate and a recording layer supported on the substrate and subjected to reversible and selective phase transformation between different phases, by changing the conditions under which a light beam is radiated. The recording layer contains an alloy represented by (In.sub.100-x Sb.sub.x).sub.100-y Te.sub.y (where x and y are in atomic %, 45.ltoreq.x.ltoreq.50, and 25.ltoreq.y.ltoreq.45).
摘要:
An optical disk comprises a polycarbonate substrate, a first protective layer formed on the substrate and made of SiO.sub.2, a recording layer formed on the first protective layer and made of an In-Sb-Te alloy, a second protective layer formed on the recording layer and made of SiO.sub.2, and a surface protective layer formed on the second protective layer and made of an ultraviolet curable resin. The recording layer has a composition of In.sub.50-x Sb.sub.50 Te.sub.x (wherein x is in atomic % and falls within the range of 0
摘要:
A polyvinyl chloride resin composition comprises 3-30 wt. % of a graft copolymer and 97-70 wt. % of a polyvinyl chloride resin and has highly-balanced properties between impact resistance, transparency and stress-whitening resistance and excellent processing characteristics. The graft copolymer is obtained by graft-polymerizing, in the presence of a latex containing greater than 75 but not exceeding 85 parts by weight of a rubbery butadiene-styrene copolymer formed of 65-85 wt. % of butadiene, 15-35 wt. % of styrene and 0-3 wt. % of crosslinkable monomer, (i) 5-24 parts by weight of a first monomer mixture as a first-stage component, said first monomer mixture being composed of 70-97 wt. % of methyl methacrylate and 30-3 wt. % of an alkyl acrylate whose alkyl group has 1-8 carbon atoms; and then (ii) 3-21 parts by weight of a second monomer mixture as a second-stage component, said second monomer mixture being composed of 97-100 wt % of styrene and 0-3 wt. % of crosslinkable monomer. The sum of the first and second monomer mixtures and the rubbery butadiene-styrene copolymer is 100 parts by weight. The monomers grafted in the first stage amount to 30-80 wt. % of the sum of the grafted monomers.
摘要:
A control device for use in an air turbine dental handpiece comprising an air turbine which is integrated with a spindle supporting a cutting tool and is rotatably supported in a head housing by bearings, an air supply passage which supplies compressed air to the air turbine and an exhaust passage which discharges air spent to drive the air turbine, the control device being characterized in that the control device comprises a pressure or flowrate regulating device disposed in the exhaust passage to control the speed of the turbine in the range of stop to high-speed operation by changing the back pressure of the air turbine.
摘要:
Herein disclosed are a mask for X-ray exposure composed of a X-ray absorbing layer of tungsten having a desired pattern, a membrane transparent to X-ray and supporting the X-ray absorbing layer, a frame member reinforcing and supporting the membrane at the periphery thereof and films of titanium and/or nickel provided between the membrane and the X-ray absorbing layer. The mask makes it possible to obtain an accurate replication of extremely fine patterns and the desired pattern of the mask can be prepared by the direct dry etching of the X-ray absorbing layer using a resist pattern as the etching mask.
摘要:
A spark plug is disclosed, in which the insulator is formed with a stepped portion near its tip portion and the housing which surrounds the insulator is formed with an inner constriction which opposes the smaller portion of the insulator, near the stepped portion, with a small annular gap being left therebetween, thereby hindering the entry of air/fuel mixture and carbon particles into the inner space between the housing and the insulator, and thus reducing the buildup of carbon on the insulator.
摘要:
A liquid crystal device includes a pair of substrates; a liquid crystal layer sandwiched between the pair of substrates; a plurality of pixels each including a plurality of pixel regions, each of the pixel regions having a reflective display region and a transmissive display region; a phase difference film provided in the reflective display region, the phase difference film being located at a side of one substrate of the pair of substrates adjacent to the liquid crystal layer; and a partition wall member having light-shielding properties, the partition wall member being provided at the side of the one substrate adjacent to the liquid crystal layer to partition the phase difference film.