Abstract: An oxide superconducting material having a composition represented by a formulaTlSr.sub.2 (Sr.sub.n-x Y.sub.x)Cu.sub.n+1 O.sub.5+2nwherein n=1 or 2 and 0.1.ltoreq.x.ltoreq.n is provided. This material has a high critical current density Jc even by sintering at a relatively low temperature of 850.degree.-880.degree. C.

Abstract: A porous sintered body for an aluminum-titanium alloy electrolytic capacitor has a wire of nitrogenized titanium, or the like, implanted therein. A method of producing such a porous body subjects a titanium wire to a nitriding treatment, and embeds the nitrogenized Ti wire into a press-molded body of the mixture of aluminum and either titanium or titanium hydride powders. Then, the press-molded body is sintered. An excellent LC characteristic is obtained even under the sintering condition, and the aluminum-titanium electrolytic capacitor is devoid of bent lead wires.

Abstract: A porous body of Ti-Al alloy has a novel structure for a solid electrolytic capacitor, having improved values of leakage current and dielectric loss. The porous body of Ti-Al alloy has spherical particles which partially contact each other to form an integral body. The surfaces of the spherical particles have a ruggedness in the order of several microns or less. Because the diameter of the spherical particle is greater than the size of the ruggedness, the porous body has rough voids which provide a wide passageway through which a manganese nitrate solution penetrates. The wide passageway is effective for decreasing the number of times when there is a thermal decomposition of the manganese nitrate, thereby reducing the series resistance of the resultant cathode. In addition, this novel structure makes it possible to avoid production difficulties which are usually encountered when a solid electrolytic capacitor, having a high capacitance, is produced from a finely divided Ti-Al alloy.

Abstract: A porous body, for a solid electrolytic capacitor, is made from a combination of titanium and aluminum in order to reduce dependence upon tatalum, a material which is now in extremely short supply. First, the titanium hydride and aluminum are milled into an extremely fine micro-powder. Then, the powders are mixed with the aluminum content in the range of 45%-65%, compressed into the desired body shape, and given a three-step heat treatment. In the first step, the body is heated at a temperature of 400.degree. to 500.degree. C. for a dehydrogenation. In the second step, the dehydrogenated body is heated to an alloying temperature which is higher than 500.degree. C., but lower than the melting point of aluminum. In the third step, the alloyed body is heated to a temperature which is higher than the melting point of aluminum (about 1000.degree. C.).

Abstract: A mode selecting device for a video tape reproducing apparatus of the type in which a magnetic tape is transported past rotary magnetic heads, includes a control shaft adapted to rotate about an axis, a control knob connected to the upper end of the control shaft for manually controlling the rotation of the control shaft, a photo-disk rotatable with the control shaft, a pair of photo-detectors associated with the photo-disk for detecting the rotational speed, the angular position and the direction of rotation of the control shaft about the axis, a latch mechanism for maintaining the control shaft in either a first or second axial position along the axis and for effecting successive change-overs between the first and second axial positions in response to successive depressions of the control knob, the speed of movement of the tape being controlled in response to the detection of the angular position when the control shaft is maintained in the first axial position and the speed of movement of the tape being con

Abstract: A porous, sintered Ti-Al alloy has specific surface area of 0.01-1 m.sup.2 /g, density of 20-80% of theoretical density and good mechanical strength, suitable for use in capacitor anode bodies, catalyzers, filters, etc. A mixed, press-shaped body of 10-90 atom. % Ti powder and 90-10 atom. % Al powder is processed by a first heat-treatment at 500.degree. to 665.degree. C. for 5 to 60 minutes to make it porous and then by a second heat-treatment at 700.degree. to 1300.degree. C. for 5 to 60 minutes to increase mechanical strength.

Abstract: A cast iron melting process comprising the steps of charging recarburizer in the lower portion of an electric arc furnace, charging iron scraps, and charging oxidizing slag-forming agents and/or sponge irons, and/or blowing oxygen therein to make oxidizing slag, whereby a recarburizing reaction of an iron melt with the recarburizer is carried out in parallel with an oxidizing reaction of an iron melt with an oxidizing slag, thereby minimizing the loss of C and Si, while improving a recarburizing yield, with the resulting improvements in economy.