摘要:
An optical system including, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having negative refractive power. The second lens group has, in order from the object, a front group having negative refractive power and a rear group. In various embodiments, the following conditional expressions are satisfied, 0.4
摘要:
An optical system including, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having negative refractive power. The second lens group has, in order from the object, a front group having negative refractive power and a rear group. In various embodiments, the following conditional expressions are satisfied, 0.4
摘要:
A zoom lens system for a microscope includes, in the following order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. Magnification of the zoom lens system is varied by moving the second lens group and the third lens group. The zoom lens system has an entrance pupil on the object side of the first lens group, and the following conditions are satisfied: −1.3
摘要:
By improving the material of workpiece holder body of a workpiece holder for polishing that holds a workpiece by vacuum adsorption, and the material of resin film for coating a workpiece holding surface of the holder, and developing a method for coating the surface with a resin, which does not cause blocking of perforated holes of the holder body with the resin during the resin coating process, there are provided a workpiece holder for polishing having a workpiece holding surface of high precision, and a method for producing it. According to the present invention, there are provided a workpiece holder for polishing having a workpiece holder body provided with multiple perforated holes for holding a workpiece by vacuum adsorption, wherein a holding surface of the holder body is coated with a coating film formed by applying a thermosetting resin on the holding surface and curing it with heating, and a surface of the coating film is polished, and a method for producing it.
摘要:
A chip fuse comprising an organic resin-made insulating substrate, a pair of electrodes formed at terminals of said organic resin-made insulating substrate, current protecting element wiring portions and a current protecting element positioned between said pair of electrodes and housed in said organic resin-made insulating substrate, said current protecting element having a thickness of 3-8 .mu.m and being supported on an organic resin layer having a high tracking resistance, and at least one space being formed at least on the current protecting element side, does not cause ignition nor smoking and is excellent in clearing characteristics.
摘要:
Disclosed are xanthine derivatives represented by the following Formula (I): ##STR1## in which R.sup.1, R.sup.2, and R.sup.3 independently represent hydrogen or lower alkyl; Q.sup.1, Q.sup.2, and Q.sup.3 independently represent hydrogen, lower alkyl, lower alkoxy, or halogen; and X represents --COR.sup.4 (in which R.sup.4 represents hydrogen, hydroxy, lower alkyl, or lower alkoxy) or --SO.sub.2 R.sub.5 {in which R.sup.5 represents hydroxy, lower alkoxy, trifluoromethyl, ##STR2## in which R.sup.6 and R.sup.7 independently represent hydrogen, hydroxy-substituted or unsubstituted lower alkyl, aryl, or ##STR3## (in which m represents an integer of 1 to 3; and R.sup.8 and R.sup.9 independently represent hydrogen or lower alkyl), or ##STR4## (in which Y represents a single bond, oxygen, or N--R.sup.10 in which R.sup.10 represents hydrogen or lower alkyl; and n1 and n2 independently represent an integer of 1 to 3)}, and pharmaceutically acceptable salts thereof.
摘要翻译:公开了由下式(I)表示的黄嘌呤衍生物:其中R 1,R 2和R 3独立地表示氢或低级烷基; Q1,Q2和Q3独立地表示氢,低级烷基,低级烷氧基或卤素; 或其中R 4表示氢,羟基,低级烷基或低级烷氧基)或-SO 2 R 5(其中R 5表示羟基,低级烷氧基,三氟甲基, 取代或未取代的低级烷基,芳基或者(其中m表示1〜3的整数; R 8和R 9分别表示氢或低级烷基),或者(其中Y表示单键,氧 ,或其中R 10表示氢或低级烷基的N-R 10,n1和n2独立地表示1〜3的整数)}及其药学上可接受的盐。
摘要:
Agents for the treatment of Parkinson's disease contain, as an active ingredient, a xanthine derivative or a pharmaceutically acceptable salt thereof. The xanthine derivative is represented by the formula: ##STR1## in which R.sup.1, R.sup.2 are R.sup.3 are independently hydrogen, lower alkyl, lower alkenyl, or lower alkynyl; and R.sup.4 represents cycloalkyl, --(CH.sub.2).sub.n --R.sup.5 (in which R.sup.5 represents substituted or unsubstituted aryl or a substituted or unsubstituted heterocyclic group; and n is an integer of 0 to 4), or ##STR2## in which Y.sup.1 and Y.sup.2 represent independently hydrogen, halogen, or lower alkyl; and Z represents substituted or unsubstituted aryl, ##STR3## in which R.sup.6 represents hydrogen, hydroxy, lower alkyl, lower alkoxy, halogen, nitro, or amino; and m represents an integer of 1 to 4, or a substituted or unsubstituted heterocyclic group; and X.sup.1 and X.sup.2 represent independently O or S.
摘要:
A beam member which is installed at diametral portion in a ring shape superconducting coil container for supporting hoop stress of the coil, or a portion of radiant heat shield covering the beam member, is partly or entirely composed of electrical insulators or high resistivity materials. In accordance with the above composition, eddy current which is generated in the coil container when the superconducting coil container crosses magnetic field caused by eddy current which is generated in the radiant heat shield when the radiant heat shield crosses strong magnetic field caused by the superconducting coils with relative vibration of the radiant heat shield to the superconducting coil by a dynamic cause can be suppressed. Accordingly, heat generation in the superconducting coil container can be reduced, and consequently, generation of quenching can be prevented.
摘要:
There is disclosed a coil structure which can be rapidly energized or excited, and which reduces the generation of heat in a coil container by an eddy current due to a dynamic disturbance such as vibration and a magnetic field fluctuation, thereby suppressing the occurrence a quench. The coil container is constituted by a low-resistivity material, and a high-resistivity portion is provided at at least one portion of the coil container in the direction of the periphery of the coil container. The high-resistivity portion is provided at a position where a vibration displacement is small or a magnetic field fluctuation is small. When the coil structure is to be energized or excited, the eddy current produced in the direction of the periphery of the superconducting-coil container can be reduced at the high-resistivity portion, and when the dynamic disturbance develops, the generation of heat by the eddy current is suppressed by the low-resistivity material.
摘要:
A method of chucking semiconductor wafers, in which a silicone elastic layer with high flatness is formed on the surface of a hard substrate having fine through-holes for vacuum chucking. Next fine through-holes in the silicone elastic layer, are provided, each through-hole communicating with the fine through-holes of the hard substrate. Next a semi-conductor wafer is held on the hard substrate by vacuum chucking from the back side of the substrate, so as to hold the semiconductor wafer securely on the substrate only by surface adhesion of the silicone elastic layer during polishing of the wafer. This method does not require wax or similar adhesive for holding the semiconductor wafer on the hard surface during the polishing process, and can realize a high-precision and high-quality surface polishing process for the semiconductor wafers.