摘要:
The film boiling state of a refrigerant is maintained for a time longer than in the prior art by t to lower the nuclear boiling start temperature to a temperature at which the material proof strength of a work exceeds thermal stress, thereby lowering the cooling rate of the work. In addition, by controlling the cooling rate in hardening, the film boiling state of the refrigerant is maintained to a temperature at which the material proof strength exceeds thermal stress, thereby cooling the work at a temperature equal to or higher than the critical cooling rate of the work.
摘要:
A metallic porous product is produced by applying a slurry of a mixture of skeleton constituent metal particles and property modifying particles to an inflammable porous foam, burning the inflammable porous foam having open pores by heat to provide a metallic skeleton structure, and sintering the metallic skeleton structure.
摘要:
A method is provided for producing a preform structure which is used in a composite aluminium or aluminium alloy component in which a base metal of an aluminium or aluminium alloy is reinforced with reinforcing materials. A slurry is prepared by mixing reinforcing materials including ceramic particles and first whiskers with burning-away powders and liquid. Liquid components contained in the slurry are filtered to provide a dehydrated structure. Thereafter a preform structure is produced by sintering the ceramic particles with the first whiskers after burning the burning-away powders in the dehydrated structure.
摘要:
A porous composite forming material is held in a cavity of a casting mold, and molten light alloy is poured into the cavity of the casting mold through a gate. Then a gas pressure is applied to the cavity in the casting mold with the cavity closed, thereby impregnating the pores of the porous composite forming material with the molten light alloy and forming a composite portion formed of a composite material of the light alloy and the composite forming material.
摘要:
Disclosed is a heat-insulating structure which can be used, for example, to reduce the cooling loss of an engine. The heat-insulating structure includes a hollow particle layer made of a lot of hollow particles densely packed on a surface of a metallic base material. The hollow particle layer is covered with a coating.
摘要:
The present invention provides an animal model for prostatic stromal hyperplasia, and a method for screening for a substance effective for preventing/treating human benign prostatic hyperplasia using the animal model. The animal model for prostatic stromal hyperplasia is produced by implanting the fetal urogenital sinus of a non-human animal under the skin or beneath the prostatic capsule of a non-human animal belonging to the species of the same as or different from the said animal. A substance effective for preventing/treating human benign prostatic hyperplasia can be screened by administering a test substance to the animal model and measuring the preventive or therapeutic effect of the test substance upon the implanted tissue (fetal urogenital sinus or tissue derived therefrom).
摘要:
Disclosed is a method of coating a metal surface by contacting it with an aqueous acidic solution containing hexavalent chromium and either a non-ionic surfactant having the formulaRO(CH.sub.2 CH.sub.2 O).sub.n HwhereinR = a saturated or unsaturated aliphatic radical of 5 to 25 carbon atomsn = 2 to 30Or glycine followed by drying and baking the surface. Preferably, the solution also contains urea.
摘要:
The present invention provides an animal model for prostatic stromal hyperplasia, and a method for screening for a substance effective for preventing/treating human benign prostatic hyperplasia using the animal model. The animal model for prostatic stromal hyperplasia is produced by implanting the fetal urogenital sinus of a non-human animal under the skin or beneath the prostatic capsule of a non-human animal belonging to the species of the same as or different from the animal. A substance effective for preventing/treating human benign prostatic hyperplasia can be screened by administering a test substance to the animal model and measuring the preventive or therapeutic effect of the test substance upon the implanted tissue (fetal urogenital sinus or tissue derived therefrom).
摘要:
A conversion coating solution for treating metallic surfaces has a pH value in the range of 3 to 6 and contains 1 g/l to 50 g/l of an acid alkali phosphate as phosphate ions, 0.2 g/l to 20 g/l of one or more of chlorates and bromates, and 0.01 g/l to 0.5 g/l of tin ions, with a weight ratio of chlorine ions to tin ions being between 0.6 and 6. The solution provides a continuous and uniform conversion coating having high anti-corrosion performance.
摘要:
A crash can is made of aluminum-alloy casting and provided between a side frame extending in a vehicle longitudinal direction at a side portion of a vehicle and an end portion of a bumper reinforcement extending in a vehicle width direction. The crash can comprises a hollow tube portion extending in the vehicle longitudinal direction and having a cross-shaped section. At least one of an outwardly-projecting corner portion and an inwardly-projecting corner portion of the tube portion is formed by a groove such that a thickness thereof is thinner than that of the other portion of the tube portion. Accordingly, an impact which a vehicle body or a passenger may receive in a vehicle collision can be reduced by the crash can.