Abstract: Cell culture apparatus comprises a fluidized bed culture tank body in which cell attached porous material is fluidized by air flow, and a pre-culture tank for supplying medium to the fluidized bed culture tank body according to the amount of the liquid medium which is taken out of the fluidized bed culture tank body. By the use of a drain valve which can be controlled to remove liquid medium and porous material or just liquid medium, the cell culture apparatus can continuously produce metabolite.

Abstract: This disclosure is concerned with a method for treating a stainless steel surface by high temperature oxidation. The surface of a stainless steel article is cleaned, TiO.sub.2 and SiO.sub.2 are mixed in microparticles to form a coating agent, and water is added to the mixture to make a slip. The slip is coated on the steel surface to form a coating having a uniform thickness. The coating is dried and the article is subjected to a heat-treatment to form an oxide film. This treatment is performed in an oxidizing atmosphere for a time and a temperature suitable for the color tone to be produced. A desirable temperature for the heat-treatment is between 350.degree. C. to 700.degree. C. When a coating agent is used, it is later removed by washing, etc. after cooling the article.

Abstract: This disclosure is concerned with a method for treating a stainless steel surface by high temperature oxidation. The surface of a stainless steel article is cleaned. TiO.sub.2 and SiO.sub.2 are mixed in microparticles to form a coating agent, and water is added to the mixture to make a slip. The slip is coated on the steel surface to form a coating having a uniform thickness. The coating is dried and the article is subjected to a heat-treatment to form an oxide film. This treatment is performed in an oxidizing atmosphere for a time and a temperature suitable for the color tone to be produced. A desirable temperature for the heat-treatment is between 350.degree. C. to 700.degree. C. When a coating agent is used, it is later removed by washing, etc. after cooling the article.

Abstract: A reaction vessel including a generally cylindrical center part and two plates or discs which are secured to and close the ends of the center part. The reactant is fed into the interior of the vessel where the polymerization or other chemical reaction takes place. A heat transfer or heat exchanger system is formed by a smooth liner that is mounted coaxially with and within the interior of the center part. The liner is spaced from the center part and it is secured to the center part by a plurality of support portions. The support portions serve both to brace the liner so that it can withstand the pressure of the reactant, and as partitions which form flow paths for a coolant, between the liner and the center part.

Abstract: A rotary diaphragm press comprises a revolving drum on the periphery of which a tubular diaphragm is mounted, an endless belt assembly which consists of a cover cloth, a filter cloth, and a back-up belt separately extended and arranged one above the other over said revolving drum, and a series of receiving rollers disposed in parallel with a spindle for said revolving drum so as to press the endless belt assembly against the drum in a contact zone of the assembly. The rotary diaphragm press is further designed so that sludge successively fed to the filter cloth is held between the filter cloth and the cover cloth and is passed through the contact zone.

Abstract: A tube settler improves separation performance by dividing flow path of a fluid to be treated into a multiplicity of tubular passages to achieve fluid stream commutation and to reduce the distance which a suspended particle has to fall increasing a settling area. A critical upward-flow rate for avoiding obstructions to precipitation of the suspended particle without turbulence depends on the cross-sectional configuration of the tubular passage. A tubular passage of triangular, circular, hexagonal or rhombic configuration is disadvantageous because the height or distance from top to bottom differs from part to part across the vertical section of the passage.This invention provides a tube settler or multitube separator having a tube-nest assembly for passing the fluid to be treated therethrough. And, inclined tubular passages of the tube settler are an approximate boomerang cross-section.

Abstract: When a crossflow water cooling tower is operated, noise made by an air circulating device and water falling down inside the tower is propagated outside. In the conventional cooling towers, however, the main source of the noise, namely the noise of the falling water was very incompletely insulated. The air entering space provided according to this invention and defined by at least a pair of inclined walls and a pair of parallel side walls is in an upward-widening structure whereby the noise produced inside the tower by the flowing and falling water is dissipated upward so as to significantly reduce the noise propagated to the surrounding area.

Abstract: A tube settler improves separation performance by dividing flow path of a fluid to be treated into a multiplicity of tubular passages to achieve fluid stream commutation and to reduce the distance which a suspended particle has to fall increasing a settling area. A critical upward-flow rate for avoiding obstructions to precipitation of the suspended particle without turbulence depends on the cross-sectional configuration of the tubular passage. A tubular passage of triangular, circular, hexagonal or rhombic configulation is disadvantageous because the height or distance from top to bottom differs from part to part across the vertical section of the passage.This invention provides a tube settler or multitube separator having a tube-nest assembly for passing the fluid to be treated therethrough. And, inclined tubular passages of the tube settler are an approximate boomerang cross-section.