摘要:
A method for the production of a superconducting oxide tape having a Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10 (Bi-2223) structure interposed between silver sheets, which method consists essentially of preparing a sandwich structure having interposed between silver sheets a molded layer of a superconducting oxide precursor powder consisting essentially of Bi, Pb, Sr, Ca, Cu, and O obtained from a raw material substance composed of, in atomic composition ratio, 1.00 of Bi, 0-0.2 of Pb, 0.9-1.1 of Sr, 0.9-1.1 of Ca and 1.3-1.7 of Cu, and O, heating the sandwich structure in an atmosphere consisting of oxygen and an inert gas, having an oxygen partial pressure in the range of 0-5%, and kept at a temperature in the range of 830-850.degree. C., thereby melting the molded layer, then causing the atmosphere to retain the heating temperature and meanwhile increasing the oxygen partial pressure, thereby inducing precipitation of crystal grains possessing a Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.8 (Bi-2212) structure and excelling in orientation, and subsequently maintaining the oxygen partial pressure and temperature at the time of precipitation of the crystal grains, thereby transforming the structure into the (Bi-2223) structure while retaining the particle diameter of the crystal grains and the state of orientation, and superconducting oxide tape produced by the method.
摘要:
A method for the production of a superconducting polycrystalline wire rod having all the crystal (a, b, c) axes thereof aligned is disclosed, which consists of a step of arraying a plurality of superconducting whiskers of a composition of Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.8 (Bi-2212 phase) in such a manner as to parallellize the fiber axes of the whiskers and then aligning all the crystal axes of the superconducting whiskers with parallellized fiber axes and a step of heat-treating the resultant whiskers.
摘要:
This invention concerns a method for the production of an oxide superconducting tape material having a composition of Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.8, which method consists essentially of forming a sandwich structure comprising a layer formed of a superconducting powder consisting essentially of Bi, Sr, Ca, Cu, and O and having an essential structure of Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.8 and silver sheet layers, the superconducting powder layer being interposed between the silver sheet layers, heating the sandwich structure at a temperature in the range of 810.degree.-910.degree. C. in an atmosphere consisting of oxygen and an inert gas and having an oxygen partial pressure in the range of 0-90%, thereby melting the superconducting powder layer, and then elevating the oxygen partial pressure of the atmosphere while retaining the same heating temperature, thereby crystallizing the molten superconducting powder layer.
摘要翻译:本发明涉及一种制备具有Bi 2 Sr 2 CaCu 2 O 8组成的氧化物超导带材料的方法,该方法主要包括形成夹层结构,该夹层结构包括由基本上由Bi,Sr,Ca,Cu和O组成的超导粉末形成的层 并且具有Bi2Sr2CaCu2O8和银片层的基本结构,超导粉末层插入在银层之间,在810-910℃的温度范围内,在由氧和 惰性气体,氧分压在0〜90%的范围内,从而熔化超导粉末层,然后在保持相同的加热温度的同时提高大气的氧气分压,从而使熔融的超导粉末层结晶。
摘要:
Ceramics incorporating fibrous crystals of silicon carbide, optionally, in combination with an electroconductive substance have high electroconductivity and are amenable to electric discharge machining.
摘要:
A control circuit for a discharge lamp, which can improve the lighting performance of the discharge lamp while realizing low power consumption, and a light source device are provided. The resistance value of the variable resistor (RC1, RC2) is not switched to the low resistance (R02) for steady discharge at the fourth time t4, but is switched to the low resistance (R02) at the fifth time t5, after lowering of power supply to the filament. With such control, a change in the lamp impedance is absorbed sufficiently by the variable resistor while power supply to the filament is being lowered and, therefore, destabilization of discharge is reduced and the lighting performance is improved.
摘要:
A gas discharge tube 100 including a sealed container 1 in which a gas is sealed, an anode disposed within the sealed container, a cathode 7 which is spaced from the anode 4 in the sealed container 1 and generates discharge between the cathode 7 and the anode 4, a conductive part 6 restricting a discharge path, the conductive part 6 being disposed between the anode 4 and the cathode 7 and narrowing the discharge path, wherein by providing a cathode cover 8 which is made of ceramics, encloses the cathode 7, and has an opening 8d at least on an electron emission side, the cathode cover 8 increases the heat retaining effect of the cathode 7, makes it easy to keep the temperature of the cathode 7, and reduces power consumption.
摘要:
A powder coating composition comprising an ethylenically unsaturated compound (a) represented by the general formula ##STR1## (wherein R.sup.1 is H or CH.sub.3) and a polymerization catalyst (b) or said ethylenically unsaturated compound (a), a polymerization catalyst (b) and an epoxy (meth)acrylate (c) obtained by reacting a polyepoxide compound with an .alpha.,.beta.-unsaturated monocarboxylic acid, wherein the weight ratio of the component (a)/the component (c) is 90 to 20 parts by weight/10 to 80 parts by weight.
摘要:
A polymerizable monomer is obtained by contacting a waste of thermoplastic resin with a fluid heat transfer medium, cooling the resulting decomposed product and subjecting it to distillation. Synthetic resin such as acrylic acid polystyrenic resins are thus thermally decomposed by contact with a heat transfer medium thereby decomposing it composed of an organic heat transfer medium and an inorganic heat transfer medium having a melting point of less than 500.degree. C.
摘要:
The present invention relates to a light source apparatus with a structure that improves the positioning precision of a gas discharge tube and facilitates gas discharge tube maintenance work. The light source apparatus has a lamp container housing the gas discharge tube, and an insulating socket member that is fixed in a state of being positioned with respect to the lamp container and that is housed in the lamp container together with the gas discharge tube. The insulating socket member has a plane contacting portion put in plane contact with a stem portion of the gas discharge tube, and a pin socket member into which at least one of stem pins, held in the stem portion is inserted in an electrically contacting state. By the corresponding stem pin being inserted in the pin socket member, the gas discharge tube is fixed in a manner enabling attachment and detachment with respect to the insulating socket member, and the precision of positioning of the gas discharge tube with respect to the lamp container is thereby improved dramatically. Also, because the insulating socket member fixes the gas discharge tube in a detachable state, detachment of the gas discharge tube is facilitated and consequently, exchange of the gas discharge tube and other maintenance work are facilitated.
摘要:
The present invention relates to a light source apparatus with a structure that enables the brightness of a gas discharge tube to be stabilized and facilitates gas discharge tube maintenance work. The light source apparatus has a gas discharge tube, a lamp container housing the gas discharge tube, and a base on which the lamp container is fixed. The gas discharge tube is fixed via a heat insulating member to a portion of an outer shell of the lamp container, and the heat insulating member functions to reduce heat transfer between the lamp container and the gas discharge tube to reduce the influence of temperature change, outside the lamp container, on the gas discharge tube. The lamp container also has an attachment/detachment structure for enabling attachment and detachment of the portion of the outer shell on which the gas discharge tube is fixed via the insulating member, with respect to the remaining portion of the outer shell, and whereby the attachment/detachment structure facilitates gas discharge tube maintenance work.