摘要:
A rocket nozzle includes a dual-bell nozzle and a gas introducing section configured to introduce gas into space surrounded by the dual-bell nozzle. Combustion gas flows in the space. The dual-bell nozzle includes a first stage nozzle bell-shaped and surrounding an upstream portion of the space, and a second stage nozzle bell-shaped and surrounding a downstream portion of the space. The dual-bell nozzle has an inflection point between the first stage nozzle and the second stage nozzle. The gas introducing section includes a gas inlet provided to an inner wall surface of the first stage nozzle. The gas is introduced into the space from the gas inlet.
摘要:
A method to manufacture an extruded polystyrene resin foam includes the steps for heating and mixing a nucleating agent, a fire retardant, a polystyrene resin and a physical blowing agent except chlorofluorohydrocarbons together within an extruder to prepare a polystyrene resin melt; introducing the resin melt to a die having a cooling member therein and constructed so that a molten resin flow channel within the die is broad in a vertical direction but narrows abruptly near a die orifice ;and discharging the polystyrene resin melt from the die orifice into a guider attached to a top of the die and causing it to expand within the guider. The extruded foam has an apparent density of 0.015 to 0.06 g/cm3.
摘要翻译:制造挤出聚苯乙烯树脂发泡体的方法包括在挤出机内将成核剂,阻燃剂,聚苯乙烯树脂和除了氟氯烃外的物理发泡剂加热混合以制备聚苯乙烯树脂熔融物的步骤; 将树脂熔体引入到其中具有冷却构件的模具中,并且构造成使得模具内的熔融树脂流动通道在垂直方向上宽,但在模孔附近突然变窄;并且将聚苯乙烯树脂熔体从模孔排出到 导杆附着在模具的顶部并使其在导向器内扩展。 挤出的泡沫体的表观密度为0.015至0.06g / cm 3。
摘要:
An optical semiconductor device includes an n-type InP substrate having top and bottom surfaces; a stripe-shaped mesa structure including an n-type cladding layer, a multi quantum well layer, and a p-type first upper cladding layer disposed on the top surface of the substrate; a first layer of a semi-insulating material, an n-type InP hole blocking layer having a carrier concentration equal to or less than 4.times.10.sup.18 cm.sup.-3 and more than 1.times.10.sup.18 cm.sup.-3, and a second layer of the semi-insulating material disposed burying the mesa structure; a second p-type cladding layer and a p-type contact layer disposed on the mesa structure and on the second layer of the semi-insulating material, and p side electrodes spaced from each other in a stripe direction of the mesa structure, disposed on the p-type contact layer; and an n side electrode disposed on the bottom surface of the substrate. Therefore, an optical semiconductor device is available which has superior element isolation characteristics and broad modulation bandwidth, and enables the individual elements to operate with the utmost performance.
摘要翻译:光学半导体器件包括具有顶表面和底表面的n型InP衬底; 包括n型包覆层,多量子阱层和设置在衬底的顶表面上的p型第一上包层的条状台面结构; 半绝缘材料的第一层,载流子浓度等于或小于4×10 18 cm -3且大于1×10 18 cm -3的n型InP空穴阻挡层和设置在所述半绝缘材料上的第二层 埋葬台面结构; 设置在半绝缘材料的台面结构和第二层上的第二p型覆层和p型接触层,以及在台面结构的条带方向上彼此隔开的p侧电极,设置在 p型接触层; 以及设置在基板的底面上的n侧电极。 因此,可获得具有优异的元件隔离特性和宽调制带宽的光学半导体器件,并且能够使各个元件以最大的性能进行操作。
摘要:
This invention provides devices each of which has at least one bipolar transistor and at least one MOS transistor, both formed on a substrate. This invention also provides their fabrication process. Each device is constructed of epitaxial layers of a first and second conductivity types, surfaces of said epitaxial layers being partly exposed, at least one MOS transistor formed in the epitaxial layer of the first conductivity type, and at least one bipolar transistor formed in the epitaxial layer of the second conductivity type. Its fabrication process comprises the steps of forming the epitaxial layer of the second conductivity type on the semiconductor substrate, forming the epitaxial layer of the first conductivity type on a part of the epitaxial layer of the second conductivity type, forming the bipolar transistor in the epitaxial layer of the second conductivity type and then forming the MOS transistor in the epitaxial layer of the first conductivity type.
摘要:
In a graded index optical fiber whose refractive index distribution (n) at the radial length r is given by ##EQU1## where (n.sub.0) is the refractive index at the core axis, (a) is the core radius, .alpha. is a power exponent, n.sub.e is the refractive index of the cladding, and .DELTA.=(n.sub.0 -n.sub.e)/n.sub.0, said exponent .alpha. and the normalized frequency v (=(2.pi.an.sub.0 /.lambda.).sqroot.2.DELTA., .lambda. is the wavelength) are determined so that the group delay of the fundamental mode is equal to that of the first higher order mode. In particular, the value of .alpha. is determined in the range 3.2.ltoreq..alpha..ltoreq.6.0. Thus, the optical fiber with both a broad bandwidth and a large core diameter can be provided. A large core diameter optical fiber facilitates the connection or the splicing of two optical fibers.
摘要:
The impurity concentration distribution of the layers of a multilayer junction diode is varied such that the concentration in a first region contiguous to the junction is low, in a second region is high, in a third region is low and in a last region gradually increases in the direction away from the junction.
摘要:
A semiconductor laser in which six layers are grown on one another, over an Si—GaAs substrate, in the following order: an Si—GaAs buffer layer, an Si—AlGaInP cladding layer, an active layer, an Mg—AlGaInP cladding layer, an Mg—AlGaInP band discontinuity reduction layer, and a Zn—GaAs contact layer. In this configuration, the carrier concentration of the Si—GaAs substrate may be from 1×1017 cm−3 to 7×1017 cm−3 to reduce the number of atoms diffusing from the Si—GaAs substrate into the active layer and so the active layer of the semiconductor laser has good light emission characteristics.
摘要翻译:在Si-GaAs衬底上依次生长六层的半导体激光器:Si-GaAs缓冲层,Si-AlGaInP包覆层,有源层,Mg-AlGaInP包覆层, Mg-AlGaInP带不连续还原层和Zn-GaAs接触层。 在这种配置中,Si-GaAs衬底的载流子浓度可以为1×10 -3 -3至7×10 17 cm -3, 3以减少从Si-GaAs衬底扩散到有源层中的原子数,因此半导体激光器的有源层具有良好的发光特性。
摘要:
The invention consists in a capacitative electromagnetic flow meter in which excitation is performed at a frequency above the commercially available frequency and having a characteristic correction filter that corrects the gain frequency characteristic of the exciting current such that the exciting flux waveform has a flat section. In the detection unit, the value of the electrostatic capacitance between the face electrodes 4A, 4B and guard electrodes 5A, 5B is made smaller than the value of the electrostatic capacitance between the detecting face electrodes 4A, 4B and the fluid to be measured. The exciting coils are fixed to a cylindrical yoke, being electrostatically screened by coil fixing plates. Fixing by an earth ring is performed with this cylindrical yoke and the two ends of the measurement tube being symmetrical with respect to the tube axis and electrode axes. In addition, fixing is effected by filling the entire interior of the detection unit with epoxy resin.
摘要:
Provided is a hard coat film which has an inorganic hard coat layer having excellent scratch resistance and weatherability and inhibited from generation of curling and which is particularly suited for sticking on outside faces of window glasses in lofty buildings. The hard coat film is prepared by laminating in order a primer layer and a hard coat layer comprising metal oxide particles and a cured matter of a silane compound on one face of a base material and further providing, if necessary, a coating layer having various functions on the above hard coat layer.
摘要:
In a method for doping with beryllium, when epitaxially growing a III-V compound semiconductor, (MeCP).sub.2 Be is employed as a dopant source. Since (MeCP).sub.2 Be has a lower vapor pressure than diethylberyllium (DEBe) which is conventionally employed as the dopant source doping control is facilitated. In addition, since (MeCP).sub.2 Be having a higher purity than DEBe is easily obtained, impurities such as oxygen are not incorporated into the active layer during doping, whereby a high quality p type layer is realized.