Abstract:
This welding method is a flash butt welding method of a pair of track rail steel pieces, having: a preheating process in which electric current is made to flow for a predetermined time in a state in which the welding surfaces of a pair of track rail steel pieces are forcibly brought into contact with each other, and vicinities of the welding surfaces are heated by resistance heating; a former flashing process in which flashing is partially caused in the welding surfaces, and the welding surfaces are heated by the resistance heating and arc heating of the flashing; and a latter flashing process in which the flashing is furthermore caused throughout the entire welding surfaces, and the entire welding surfaces are uniformly heated by the resistance heating and arc heating of the flashing, in which a latter flashing velocity is 2.1 mm/sec to 2.8 mm/sec in the latter flashing process.
Abstract:
This welding method is a flash butt welding method of a pair of track rail steel pieces, having: a preheating process in which electric current is made to flow for a predetermined time in a state in which the welding surfaces of a pair of track rail steel pieces are forcibly brought into contact with each other, and vicinities of the welding surfaces are heated by resistance heating; a former flashing process in which flashing is partially caused in the welding surfaces, and the welding surfaces are heated by the resistance heating and arc heating of the flashing; and a latter flashing process in which the flashing is furthermore caused throughout the entire welding surfaces, and the entire welding surfaces are uniformly heated by the resistance heating and arc heating of the flashing, in which a latter flashing velocity is 2.1 mm/sec to 2.8 mm/sec in the latter flashing process.
Abstract:
A heat-storage composition containing: (1) sodium sulfate, ammonium chloride and water, (ii) a water swellable crosslinked polymer or a water-soluble acrylic polymer, and (iii) a surfactant having a polyoxyalkylene chain, and a process for producing the composition. The heat-storage composition has a melting point and a freezing point in a temperature range suitable for cooling in air conditioning, and also has the stability necessary for withstanding repetitions of melting/freezing in long-term use.
Abstract:
The invention provides a method for preventing supercooling of a latent heat storage composition comprising one peritectic salt hydrate selected from the group consisting of disodium hydrogenphosphate dodecahydrate, sodium thiosulfate pentahydrate, sodium carbonate decahydrate and sodium acetate trihydrate, water and a water-swellable crosslinking polymer. The latent heat storage composition has a constitution such that a temperature of secondary nucleation of the peritectic salt hydrate is higher than a temperature of secondary nucleation of a lower hydrate, and a part of the latent heat storage composition is always kept at a temperature the same as or lower than a melting point of the periteetic salt hydrate.
Abstract:
A method for forming a hydroxyapatite coating film on a substrate which comprises coating a dispersion of flocculated colloids of hydroxyapatite on a substrate and drying. The coating method of this invention does not require heating of the coated substrate to high temperature and hence can also be applied to a substrate which is easily deteriorated with heat. The coated substrate of this invention has excellent strength and adhesion force and is useful in a variety of fields, particularly as an implant and as a material, adsorbing and separating agent.
Abstract:
A ceramic shaped product comprising a ceramic substrate, a single or multiple layers of ceramic spherical granules on the surface of the substrate, and a process for the production thereof, which comprising arranging spherical granules of a ceramic material on the surface of the ceramic substrate in a single or multiple layers at a state of contacting each other, pouring a slurry of a ceramic powder onto the layer(s) of ceramic spherical granules, followed by sintering. The ceramic shaped product has strong binding between the granules and the plate and also between each granules at wide contact and has an excellent strength, and hence, is useful for various utilities, particularly as an implant such as artificial bones, artificial joints, artificial tooth roots and the like.
Abstract:
A new type of cosmetics is prepared by incorporating therein a synthetic flaky metallic oxide having an average thickness of about 0.1 to about 2 .mu.m, an average size of about 1 to about 100 .mu.m [which is defined as an average value of (the longest diameter of flakes+shortest diameter of flakes)/2 for 100 flakes], and a refractive index of about 1.4 to about 1.8. Make-up cosmetics containing an artificially synthesized flaky metallic oxide of a low refractive index as a pigment, particularly an extender pigment have an improved touch and stability with time in use which has not been attained by conventional cosmetics.
Abstract:
A hollow plate-like panel comprising at least two face plates spaced apart at a given distance from each other and a core member composed of a plurality of unit cells and sandwiched between the face plates, at least one hole being provided in at least one face plate and each unit cell having at least two holes communicating with adjoining unit cells, is suitable for filling a solidifiable heat storage material to give a heat storage material panel with high strength and durability.
Abstract:
A heat storage system comprising a heat storage material containing a salt hydrate, wherein the heat storage material comprises following three serial parts, (A) a seed crystal part in which a seed crystal is maintained, (B) a part functions as a switch by heating, or heating and cooling and (C) a main body part which can store and release heat, and a method for heat release control, wherein crystal spread from the seed crystal part (A) to the main body part (C) is controlled by the heating or cooling operation of the part (B) in the above-described heat storage system.
Abstract:
A method for forming a hydroxyapatite coating film on a surface of a substrate which comprises coating a coating liquor onto a surface of a substrate, followed by drying and then subjecting to insolubilization (e.g., treating with an insolubilizing agent or calcination) which is characterized by using a coating liquor comprising a colloidal dispersion of hydroxyapatite having a fine particle size of 0.5 .mu.m or less.