摘要:
A semiconductor light-emitting device comprising a substrate having a surface having an off-angle to a crystallographic plane of low-degree surface orientation, the substrate having thereon: compound semiconductor layers including an active layer; a selective growth protective film formed on the compound semiconductor layers and having an opening at the region corresponding to a stripe region to which a current is injected; and a ridge-shaped compound semiconductor layer formed to cover the opening. This semiconductor light-emitting device with stable laser property can be manufactured in a simplified way.
摘要:
The present invention relates to a semiconductor laser diode comprising a GaAs substrate and at least a first conduction-type clad layer, an active layer containing In, Ga and As as component elements, a second conduction-type first clad layer, a current block layer and a second conduction-type second clad layer which are deposited on the substrate in order, wherein a current injection region is formed by said current block layer and said second conduction-type second clad layer, the effective refractive index step &Dgr;neff in the horizontal direction is from 2.5×10−3 to 5.0×10−3 at the emission wavelength, and the width W of the current injection region is from 1.5 to 2.5 &mgr;m. The semiconductor laser diode of the present invention is suited for uses where high output and long life-time are required, such as excitation light source for optical fiber amplifiers.
摘要:
A p-type ohmic metal electrode for use with a group II-VI semiconductor device. The p-type ohmic metal electrode is made of a group II-IV p-type semiconductor layer having a group II element other than zinc dispersed in that layer disposed on the group II-IV semiconductor device, and a metal electrode layer disposed on the group II-IV semiconductor layer including the group II element other than zinc. Also disclosed is a group II-IV semiconductor device including a p-type group II-IV semiconductor containing zinc and selenium and the above ohmic metal electrode disposed on the group II-IV semiconductor device. Additionally, a group II-IV semiconductor device including a p-type group II-IV semiconductor containing zinc and selenium, a layer of a group II element other than zinc disposed on the group II-IV semiconductor device, and a metal electrode layer disposed on the layer of the group II element other than zinc is disclosed.
摘要:
The disclosure describes a method of forming a groove in a structure of a semiconductor laser diode, which comprises a crystal growth procedure of epitaxial growth of a core layer comprising MP, wherein M represents one or more of elements belonging to group IIIb of periodic table and an upper layer comprising MAs, wherein M represents one or more of elements belonging to group IIIb of periodic table, successively on (100) surface of MAs crystals in a lower layer comprising MAs; a photolithography and wet etching procedure of, after forming an etching mask on the upper layer, forming an etching window to the etching mask; a first etching procedure of selective etching the upper layer; and a second etching procedure of selective etching other faces except for the face in which (111) face of MP crystals in the core layer is exposed.
摘要:
A pressurized fluidized bed combustion boiler system comprising: a boiler; a filtration apparatus with ceramics filters in a flue gas system; and a louver separator as a primary stage dust separator disposed between the boiler and the filtration apparatus.
摘要:
A sheet feeding apparatus for feeding a sheet to a sheet receiving device includes a first unit having at least one stacking tray for stacking sheets; a first feeder for feeding the sheet from the stacking tray of the first unit; a first guiding member for guiding the sheet from the first feeder to the receiving device; a second guiding member for guiding a side of the sheet opposite from a side guided by the first guiding member to constitute together with the first guiding member a sheet passage; a second unit having at least one stacking tray for stacking sheets; second feeder for feeding the sheet from the stacking tray of the second unit; a third guiding member for guiding the sheet from the second feeder to the receiving device; and a supporting device for supporting the first unit to the second unit for movement between a first position wherein the first guiding member guides the sheet from the first feeder and a second position wherein at least one of the first guiding member and the second guiding member are exposed.
摘要:
Provided is a catalyst for purifying an exhaust gas, the catalyst excelling in catalytic performance and oxygen storage capacity. The catalyst for purifying an exhaust gas is a catalyst for purifying an exhaust gas which includes a ceria-zirconia composite oxide having a pyrochlore structure and a ceria-zirconia composite oxide having a cubic crystal structure, wherein at least a part of the ceria-zirconia composite oxide is composited with the ceria-zirconia composite oxide.
摘要:
It is to suppress abnormal growth of GaN crystals around edge ends of a seed substrate. A susceptor is provided that has a pocket section in which a seed substrate is fixed, and a sub-susceptor provided between the susceptor and the seed substrate, the sub-susceptor being not reactive with the seed substrate, with a gap provided between the seed substrate and the sub-susceptor.
摘要:
PROBLEMThe present invention is directed to provide a catalyst for purifying exhaust gas capable of maintaining a superior catalytic performance even when the catalyst is exposed to an exhaust gas at a high temperature of 800° C. or higher.SOLUTIONThe catalyst for purifying exhaust gas of the present invention comprises a catalytically active component containing a noble metal and a promoter containing an oxygen storage material both being supported on a carrier. The oxygen storage material comprises cerium, zirconium, and iron, and content of iron in the oxygen storage material is 0.01% by mass or more and less than 0.70% by mass (Fe2O3 conversion) relative to the total mass of the oxygen storage material. And the oxygen storage material is (a) a complex oxide or a solid solution of iron and a metal comprising cerium and zirconium; or (b) an iron is supported on a complex oxide or a solid solution of a metal comprising cerium and zirconium.
摘要翻译:本发明的目的在于提供即使在800℃以上的高温下将催化剂暴露于废气时,能够维持优异的催化性能的排气净化用催化剂。 解决方案本发明的用于净化废气的催化剂包含含有贵金属的催化活性组分和包含负载在载体上的储氧材料的助催化剂。 储氧材料包括铈,锆和铁,并且储氧材料中的铁含量相对于储氧材料的总质量为0.01质量%以上且小于0.70质量%(Fe 2 O 3转化率)。 并且储氧材料是(a)铁和包含铈和锆的金属的复合氧化物或固溶体; 或(b)铁包含在包含铈和锆的金属的复合氧化物或固溶体上。
摘要:
An Object of the patent is to remove highly reducing hydrocarbon exhausted during acceleration period, and to remove efficiently hydrocarbon even after contacting with highly reducing hydrocarbon. By using a catalyst having a higher proportion of palladium having surface charge of 2-valence or 4-valence supported than that of 0-valence by supporting palladium together with magnesium oxide, hydrocarbon exhausted from an internal combustion engine especially during acceleration period can be efficiently removed.