摘要:
AlN is added to a SiC light emitting layer of an optical semiconductor device in a molecular state, and an association of AlN is formed between crystal lattice points, which are close to each other in said light emitting layer. Said association is largely different from said SiC in degree of electron negativity so that said association traps a carrier in said light emitting layer, and forms an exciton.
摘要:
A server for distributing information provided by an information provider as an information element group consisting of one or more information elements connected, to a user terminal. The server includes means for creating a hierarchical structure between the information elements via an image, means for receiving an access to an image related to the first information element, means for searching a second information element constituting a hierarchical structure with the first information element via the image, and means for arranging the second information element on the image and distributing it to the user terminal.
摘要:
A 7-acyl-3-substituted carbamoyloxy cephem compound represented by the following formula (1): ##STR1## wherein A means a --CH.dbd. or --N.dbd. group; R.sup.1 denotes a hydroxyl, lower alkoxyl, fluorine-substituted lower alkoxyl or protected hydroxyl group; R.sup.2 and R.sup.3 are the same or different and individually represent a lower alkyl, hydroxyl-substituted lower alkyl, a carbamoyl-substituted lower alkyl group or cyano-substituted lower alkyl group, R.sup.2 is a hydrogen atom and R.sup.3 is a lower alkoxyl or alkyl group optionally substituted by one or more halogen atoms, or the group ##STR2## means a 4-6 membered heterocyclic group, which contains one nitrogen atom, or a morpholino group, said heterocyclic group or morpholino group being optionally substituted by one or more lower alkyl, hydroxyl and/or hydroxyl-substituted lower alkyl groups; and R.sup.4 denotes a carboxyl or protected carboxyl group; or a pharmaceutically acceptable salt thereof; and a process for the preparation thereof; as well as an antibacterial composition containing the above cephem compound.
摘要:
A 7-acyl-3-substituted carbamoyloxy cephem compound represented by the following formula (1): ##STR1## wherein A means a --CH.dbd. or --N.dbd. group; R.sup.1 denotes a hydroxyl, lower alkoxyl, fluorine-substituted lower alkoxyl or protected hydroxyl group; R.sup.2 and R.sup.3 are the same or different and individually represent a lower alkyl, hydroxyl-substituted lower alkyl, a carbamoyl-substituted lower alkyl group or cyano-substituted lower alkyl group, R.sup.2 is a hydrogen atom and R.sup.3 is a lower alkoxyl or alkyl group optionally substituted by one or more halogen atoms, or the group ##STR2## means a 4-6 membered heterocyclic group, which contains one nitrogen atom, or a morpholino group, said heterocyclic group or morpholino group being optionally substituted by one or more lower alkyl, hydroxyl and/or hydroxyl-substituted lower alkyl groups; and R.sup.4 denotes a carboxyl or protected carboxyl group; or a pharmaceutically acceptable salt thereof; and a process for the preparation thereof; as well as an antibacterial composition containing the above cephem compound.
摘要:
A light-emitting diode has a GaAs substrate, and two ZnSe layers formed on the substrate and having a pn junction. An AuZn electrode is formed on the upper one of the ZnSe layers with a (ZnSe).sub.x (GaAs).sub.(1-x) ohmic contact layer interposed therebetween. The coefficient x of the composition formula is substantially continuously varied from 1.0 to 0 from the ZnSe layer side. An AuGe electrode is formed on the lower surface of the GaAs substrate. The (ZnSe).sub.x (GaAs).sub.(1-x) layer reduces the resistance between the ZnSe layer and AuZn electrode, and also prevents Ga atoms from diffusing into the ZnSe layer.
摘要:
An optical semiconductor device is provided with a p-type ZnSe semiconductor layer. Si, Cl and O atoms are added, as dopants, to the ZnSe semiconductor layer. Associations of the Si, Cl and O atoms are formed to define a shallow acceptor level in the semiconductor layer. Each of the associations comprises one Si atom, one Cl atom and one O atom by which the lattice points of Se are displaced between those crystal lattice points in the semiconductor layer which are adjacent to one another.
摘要:
A semiconductor light emitting device is disclosed which comprises a compound semiconductor substrate, an n type ZnS.sub.x Se.sub.1-x crystal layer (0.ltoreq.x.ltoreq.1) formed on the substrate and containing a Group VII element as a donor impurity, and a p type ZnS.sub.y Se.sub.1-y crystal layer (0.ltoreq.y.ltoreq.1) formed on the n type crystal layer and containing a Group I element as an acceptor impurity, where a pn junction is formed between the n type crystal layer and the p type crystal layer.
摘要翻译:公开了一种半导体发光器件,其包括化合物半导体衬底,在衬底上形成并含有作为施主杂质的第VII族元素的n型ZnS x Se 1-x晶体层(0≤x≤1) 形成在n型晶体层上并含有作为受主杂质的第I族元素的ZnSySe1-y型ZnSySe1-y晶体层(0