Abstract: A flame-retardant magnetic composite resin composition is provided which comprises 10 to 50% by weight of a binder resin mixture containing 100 parts by weight of a polyamide resin and suitable amounts of the following components (A) to (G), and 50 to 90% by weight of a magnetic powder of which the surface is treated with a surface-modifying agent.______________________________________ (A) Phenol 0.01 to 2.0 parts by weight (B) Thiophosphate compound 0.001 to 0.5 parts by weight (C) Copper compound 0.0001 to 0.05 parts by (based on copper weight content) (D) Bromine or nitrogen 10 to 30 parts by weight containing flame- retardant agent (E) Flame-retardant 2.5 to 7.5 parts by weight synergist ______________________________________The composition of the present invention, which is endowed with a high heat resistance and significantly improved physical properties and processability, may also include 0.001 to 0.5 parts by weight of an alkali metal halogenide compound and 0.2 to 1.0 parts by weight of a lubricant.

Abstract: The present invention relates to a method for decoloring sulphuric acid produced in accordance with the contact method, comprising one or more absorption circuits. The produced sulphuric acid is decolored by adding hydrogen peroxide to the system. The method is characterized by adding the hydrogen peroxide to the sulphuric acid in the final absorption circuit, and by maintaining the temperature in this circuit above about 70.degree. C.

Abstract: In a crystal pulling process using an integral type double crucible, a cylindrical separation wall is mounted in and is coaxial with a crucible, for receiving semiconductor material melt to divide the crucible into inner and outer chambers. A coupling tube fixed at the side wall of the separation wall and having a pipe-like passage with a small hole is provided to make a pass between the inner and outer chambers. While material melt in the outer chamber is being supplied to the inner chamber via the coupling tube, crystal is pulled from the melt received in the inner chamber and having an impurity composition different from that of the melt in the outer chamber.

Abstract: A method for producing an elastic graphite material having a packing density of 1.0 g/cm.sup.3 or lower and a recovery of 50% or higher at a compressibility of 10 to 90% is provided, which comprises: heating a carbonaceous material rapidly while bringing the carbonaceous material into contact with nitric acid for expansion and foaming, and graphitizing the thus expanded and foamed carbonaceous material.

Abstract: The process makes calcium sulfate alpha-hemihydrate from finely divided calcium sulfate dihydrate by transforming the calcium sulfate dihydrate in the presence of saturated steam. A molded body is formed from the calcium sulfate dihydrate which has a plurality of pores having a pore volume amounting to 15 to 60% by volume of the total volume of the entire molded body. More than 5% by volume of the pore volume contains air. The molded body is fed to the autoclave. In the presence of a sufficient water quantity in the pores the crystal habit and the crystal growth of the calcium sulfate alpha-hemihydrate crystals which grow in an aqueous solution phase are controlled by a process temperature in the range between 110.degree. to 180.degree. C. by the pressure of the process atmosphere in the autoclave. The molded body is removed from the autoclave after recrystallization transformation and delivered for use. Key products of this process and their derivatives are also described.

Abstract: Disclosed herein are a magnetic fluid, a method for the production thereof, and a magnetic seal apparatus using the same, characterized in that the surfaces of ferromagnetic particles are covered with a monomolecular adsorbed film composed of a chloro-silane type surfactant, and the coated particles are dispersed in an oil. A magnetic seal apparatus using such a magnetic fluid.

Abstract: The present invention discloses a process for rejuvenation of strip acid employed in the reclamation of expended lead-acid battery acid through extraction and filtration for removing metallic impurities from the battery acid. In the process of removing impurities from battery acid through extraction, the extractant becomes loaded with impurities and loses its effectiveness. Extractant may be regenerated by contacting it with an strip acid. In the present invention, a reduction process is employed to regenerate the strip acid so that it may be used repeatedly. By recycling the extractant and the strip acid in the present invention, the present process further increases the effectiveness of battery acid regeneration--producing a reclaimed battery acid fluid which performs very well in new batteries and substantially reducing by-product waste in the regeneration of the battery acid.

Abstract: A recharging device suitable for use in a Czochralski-type monocrystal ingot pulling apparatus, includes a shaft (3) which is suspended from a pulling element (1), a ring slider (8) capable of sliding along the shaft, a stopper (20) for stopping the downward movement of the ring slider, a pair of hooks (9, 11, 13) pivotably connected to the shaft below the ring slider and capable of assuming hooking and unhooking positions, and a pair of rods (16) each having one end connected to the hooks such that when the ring slider slides upward relative to the shaft the pair of the rods cause the hooks to assume their unhooking position, and when the ring slider slides downward relative to the shaft the rods cause the hooks to assume their hooking position.

Abstract: According to this invention, a semiconductor rod zone melting apparatus for manufacturing single-crystal semiconductor such as silicon, germanium, and the like and compound semiconductors such as gallium phosphate, and the like by the FZ process is disclosed. In this invention, a substantially U-shaped metal piece is arranged near one of upper and lower side surfaces of an induction heating coil surrounding a floating zone of a semiconductor rod to be melted, the floating zone surrounding space can be varied upon relative movement between the coil and the metal piece toward the radial direction of the coil. The floating zone of the semiconductor rod can be homogeneously and concentratively heated, and zone melting of a large-diameter semiconductor rod is facilitated.

Abstract: A silicon single crystal manufacturing apparatus in which a partition member formed with at least one small hole through its lower part is arranged in a rotating quartz crucible so as to surround a large cylindrical silicon single crystal which is rotated and pulled. The whole or part of the partition member is made from cellular silica glass whose cell content (volume percentage) is between 0.01 and 15% or less than 0.01% but increased to 0.01 through 15% by the heat used for melting starting silicon material. Thus, the molten material contacting with the inside of the partition member is prevented from decreasing in temperature and solidification of the molten material from this portion is prevented.

Abstract: Provided is a process for the preparation of chlorine dioxide. The process comprises separately feeding compounds, which when reacted together yield chlorine dioxide, into a diluting water stream. The compounds react to thereby form chlorine dioxide. Shutoff valves are provided in the feed lines of the compounds, which shutoff valves are in cooperation with a supply monitoring system and a pH meter. The supply monitoring system monitors the feed lines of the compounds and the water stream. When the monitoring detects a loss in the supply of the water or one of the compounds, shutoff valves are closed to restrict any further flow of the compounds through the feed lines. The pH meter is located downstream of the reaction and monitors the pH of the chlorine dioxide solution formed by the reaction. When the pH is detected to be outside of a particular range, the shutoff valve are closed to restrict any further flow of the compounds through the feed lines.

Abstract: Described is the process for forming a hardenable mixture of a coal ash comprising free CaO and free CaSO.sub.4 .OH.sub.2 O.In order to remove all free CaO the coal ash is mixed with a fly-ash comprising essentially no free CaO and no free CaSO.sub.4.OH.sub.2 O and water and subsequently subjected to a heat treatment.by removal of free CaO it is found that the strength of hardened granules formed from such as mixture does not deteriorate as is the case form granules formed with a coal ash comprising free CaO.Also a process for forming hardened granules and a building component formed with use of a hardenable mixture according to the invention are described.

Abstract: The rare earth borides are prepared at relatively low temperatures by reacting a rare earth halide with elemental boron in the presence of a reducing amount of aluminum metal.

Abstract: A new lid and shield configuration for use in growing silicon dendritic web crystals is disclosed. The arrangement includes a plurality of spaced apart shields stacked above a lid having a slot therein through which dendritic web crystals are pulled. The shields also have slots in them, each successive shield having a slot slightly larger than that of the shield beneath it. The result is the ability for 100% melt replenishment plus increased productivity.

Abstract: Single-crystal KTiOPO.sub.4 is synthesized by a method that includes using KH.sub.2 PO.sub.4, K.sub.2 CO.sub.3, and TiO.sub.2 as starting materials and using WO.sub.3 as a flux material. These materials are mixed together, are reacted, and then are slowly cooled while the single crystal of KTiOPO.sub.4 is grown and/or pulled, from a seed crystal, in the Czochralski manner, the Kyropoulous manner, or the so-called solution lift-off manner. Typical cooling rates are about 2.degree. C. per day or 3.degree. C. per day during growth, but can be as much as 5.degree. C. per day.

Abstract: A process for the selective separation of alkenes and/or alkynes from gases obtained by cracking of petroleum products comprising: (a) treating said gases containing at least one alkene and/or at least one alkyne with a macroporous strongly acidic cation exchange resin in its hydrogen form to selectively adsorb said at least one alkene and/or said at least one alkyne; and (b) introducing water, oxygen or an acid in vapor form to simultaneously desorb said at least one alkene and/or said at least one alkyne and to form at least one alcohol, aldehyde, oxide or ester.

Abstract: A process for the preparation of an improved quality TiO.sub.2 pigment by hydrolysis of titanyl sulphate, isolation of the hydrolysis product form the waste acid produced during the hydrolysis, washing of the hydrolysis product and calcination of the hydrolysis product to form the TiO.sub.2 pigment, wherein the hydrolysis of the titanyl sulphate is carried out using separately produced hydrolysis nuclei which have been produced by a reaction of titanium salts with alkaline reagents, and in which waste acid and/or wash liquid containing waste acid is added after at least 50% of the total duration of the hydrolysis process.

Abstract: Magnetizable composite particles, optionally in aqueous dispersion, consisting of a matrix based on a crosslinked organopolysiloxane, optionally bearing nonvinyl reactive and/or ionic units and magnetizable components less than 300 angstroms in diameter encapsulated in the matrix. The magnetizable composite particles are prepared by homogenizing a solution of the organopolysiloxane, an organohydrogenpolysilioxane optionally bearing ionic and/or reactive units, and a magnetic fluid, in the presence of water and a surfactant, performing a hydrosilylation in an aqueous emulsion, removing the organic solvents and the organic carrier liquid, and at least partially removing the water. The magnetizable composite particles are useful in biological applications.

Abstract: Disclosed is a process for the preparation of an aluminum borate whisker, which comprises mixing a trialkali aluminum trisulfate represented by the following general formula:M.sub.3 Al(SO.sub.4).sub.3wherein M represents an alkali metal, with at least one boric anhydride source component selected from the group consisting of boron oxides, boron oxyacids and alkali metal salts thereof, and carrying out reaction and growth at a temperature of from 700.degree. to 1200.degree. C.

Abstract: A magnetic fluid containing fine particles of ferrite stably dispersed in a carrier liquid is prepared by adding carrier liquid and a dispersing agent selected from N-polyalkylenepolyamine-substituted alkenylsuccinimide, an oxyalkylene-substituted phosphoric acid ester and a nonionic surfactant, and, if required, hydrocarbon solvent having a low boiling point to particles of ferrite which is coated with water-soluble surfactant and subjecting the resulting mixture to a dispersion treatment and, if required, removal of the hydrocarbon solvent.