Abstract: Resin-adhered graphite particles are obtained by causing a modified novolac-type phenolic resin to adhere to graphite particles. At least part of surfaces of the graphite particles is coated with a carbonaceous coating by heating the resin-adhered graphite particles in a non-oxidizing atmosphere at 900 to 1,500° C. to carbonize the modified novolac-type phenolic resin. Arylene groups having hydroxy groups account for 5 to 95 mol % of arylene groups constituting the modified novolac-type phenolic resin. The obtained carbonaceous substance-coated graphite particles exhibit excellent battery properties when used as a negative electrode material for a lithium ion secondary battery.

Abstract: A protection circuit for a semiconductor device is disclosed. This circuit is connected in series with a power semiconductor device to be protected, and is comprised of a circuit breaker and current-limiting device. The current-limiting device limits the overcurrent, thereby providing a time allowance until the circuit breaker begins operate.

Abstract: A method of manufacturing an amalgam for sealing in a fluorescent lamp consisting of tin, lead, bismuth, indium and mercury is disclosed. In this method, the amalgam is first melted and then discharged through a nozzle to be contacted with a coolant. A fluorescent lamp containing the amalgam manufactured by the above method is also disclosed.

Abstract: An amorphous alloy for a magnetic head has a composition which may be represented asCo.sub.100- T- X- Y- Z Ni.sub.T Hf.sub.X B.sub.Y Si.sub.Z,where T, X, Y and Z satisfy the conditions of 0.75.ltoreq.T.ltoreq.14, 6.ltoreq.X.ltoreq.15, 3.ltoreq.Y.ltoreq.8, 0.ltoreq.Z.ltoreq.0.01, 3.ltoreq.Y+Z.ltoreq.13, and 11.ltoreq.X+Y+Z.ltoreq.25. Such an amorphous alloy has a high crystallization temperature, said temperature being higher than 500.degree. C., and does not lower the effective magnetic permeability, even if gradual cooling is performed after heat treatment. A magnetic head having a core consisting of such an amorphous alloy is not deteriorated in its magnetic properties, even if the head is made by glass bonding.

Abstract: There is disclosed an amorphous alloy for a magnetic core material represented by the formula(Co.sub.1-x.sbsb.1.sub.-x.sbsb.2 Fe.sub.x.sbsb.1 M.sub.x.sbsb.2).sub.x.sbsb.3 B.sub.x.sbsb.4 Si.sub.100-x.sbsb.3.sub.-x.sbsb.4wherein M is at least one element selected from the group consisting of Ti, V, Cr, Mn, Ni, Zr, Nb, Mo, Ru, Hf, Ta, W and Re, and x.sub.1, x.sub.2, x.sub.3 and x.sub.4 are numbers which satisfy relations of 0.ltoreq.x.sub.1 .ltoreq.0.10, 0.ltoreq.x.sub.2 .ltoreq.0.10, 70.ltoreq.x.sub.3 .ltoreq.79 and 5.ltoreq.x.sub.4 .ltoreq.9, respectively.According to the present invention, it could be provided an amorphous alloy suitable for a magnetic core material of a magnetic amplifier in which its coercive force is as low as 0.4 oersted or less at a high frequency of 20 KHz or more, particularly even at 50 KHz, and its rectangular ratio is as much as 85% or more.

Abstract: An amorphous magnetic alloy has a general formula:(Fe.sub.1-a.Ni.sub.a).sub.100-x-y.Si.sub.x.B.sub.ywhere0.2.ltoreq.a.ltoreq.0.71.ltoreq.x.ltoreq.205.ltoreq.y.ltoreq.9.515.ltoreq.x+y.ltoreq.29.5The alloy is low in iron loss and suitable for forming a magnetic core used under a high frequency.