Abstract: A heating furnace tube, a method of using the same and a method of manufacturing the same which have been developed with a view to eliminating inconveniences occurring when a carbon-containing fluid is made to flow in the heating furnace tube. The heating furnace tube which comprises a rare earth oxide particle distributed iron alloy containing 17-26 wt. % of Cr and 2-6 wt. % of Al. The method of manufacturing this heating furnace tube which comprises the steps of forming or inserting an insert metal on or into at least one of a joint end portion of one heating furnace tube element and that of the other heating furnace tube element, bringing these two joint end portions into pressure contact with each other directly or via an intermediate member, and diffusion welding the two heating furnace tube elements to each other by heating the insert metal.

Abstract: The surface of an apparatus made of a Fe base alloy or Ni base alloy containing at least 35 wt. % of Cr is resistant to carbon deposition when the apparatus contacts carburizing/oxidizing atmospheres.

Abstract: A carbon deposition preventive double-layered tube for handling carbon compounds at not less than 500.degree. C., the double-layered tube comprising:(a) the layer to be exposed to the carbon compounds, constructed from an alloy which is composed of Cr, Ni, and Fe in porportions shown within a triangular region I of an equilibrium diagram (FIG.

Abstract: A process for multi-gradation thermal transfer recording which provides a receptor with an image of multi-gradation, the process comprising placing on the receptor a heat-sensitive transfer material comprised of a substrate film, an adhesive layer on one surface of the substrate film, a heat-melting ink layer thereon and a transfer-control layer formed on the heat-melting ink layer, and charging the heat-sensitive transfer material with various levels of energy depending upon image signals from the substrate side to allow the heat-melting ink of the heat-melting ink layer to transfer to the receptor in an amount that corresponds to the various levels of energy, and a multi-gradation heat-sensitive transfer material to be used in the above process.

Abstract: An apparatus for treating carbon containing compounds such as hydrocarbons or their derivatives, or carbon monoxide or the like at temperatures higher than 500.degree. C., wherein at least a member contacting with said carbon containing compounds at temperatures higher than 500.degree. C. is composed of any one of Fe base, Ni base and Co base alloys or their mixed Fe-Ni, Fe-Co, Ni-Co and Fe-Ni-Co alloys, each containing at least 28 wt.% of Cr, and this member can exhibit a superior resistance to carbon deposition.

Abstract: The optical resolution of an enantiomer mixture of oxycyclopentenone or a derivative thereof is conducted with a polysaccharide derivative.

Abstract: A rotary electrical machine connected to a rotary machine heated to high-temperature, such as a heater roll used for processing fibers, a ventilation fan for ventilating a high-temperature furnace, etc., includes a rotary shaft journaled by bearing means of the rotary electrical machine including a first member formed of material of low thermal conductivity for supporting a rotor, and a second member formed of material of high hardness constituting an output end portion of the rotary shaft remote from the bearing means. The first member and the second member are united together in a position located opposite the rotor with respect to the bearing means and spaced apart from the bearing means. Cooling means, such as a heat dissipating fan, heat dissipating fins, etc., is mounted on a portion of the rotary shaft between the vicinity of the joint of the two members and the bearing means.

Abstract: A tobacco filter comprised of cellulose acetate fibers prepared by contacting cellulose fibers in the solid fiberous state, with a gaseous or liquid acetylating agent.

Abstract: In conducting the butt welding of a coated steel produced by applying a diffusion coating with aluminum or chromium on the surface of a chromium-molybdenum steel as the base metal, adoption of a process comprising welding the diffusion-coating side of said coated steel with a ferritic high chrome steel to begin with, next welding it with a molybdenum steel or chromium-molybdenum steel selected on the bases of the content of chromium and the content of molybdenum in the base metal, and lastly welding it with the same material as the base metal, varieties of such drawbacks as would ordinarily arise from the weld zone can be avoided.