Abstract: A catalyst carrier which comprises particles of a silicon-containing ceramic material. Each of these particles is covered by a film of alumina on which a noble metal is carried.

Abstract: An object of the present invention is to provide a honeycomb structural body (filter) which has a low pressure loss upon collecting particulates, makes it possible to deposit a great amount of particulates and ashes, and is less likely to produce cracks.

Abstract: A honeycomb structural body which is capable of increasing the limiting collection amount of particulate, reducing the pressure loss in use, and reducing fluctuations in the pressure loss even if the flow rate from an internal combustion engine of exhaust gases fluctuates. The honeycomb structural body is a columnar honeycomb structural body in which a large number of through holes are arranged side by side in the length direction with a partition wall interposed therebetween. The large number of through holes are constituted by a group of large-capacity through holes, with one end thereof sealed to make the total cross-sectional areas perpendicular to the length direction relatively greater, and a group of small-capacity through holes, with the other end thereof sealed to make the total cross-sectional areas relatively smaller. The honeycomb structural body includes a plurality of columnar porous ceramic members.

Abstract: There are proposed a diesel particulate filter being small in the pressure loss in the deposition of soot and high in the filtering efficiency and a ceramic sintered body constituting a main body thereof and a method of producing the same. The porous ceramic sintered body constituting the diesel particulate filter has communicated pores consisting of large pores 21 and small pores 22. The large pores are existent on at least surface layer portion of the sintered body, and the small pores 22 have a size relatively smaller than that of the large pore 21 and are existent on the surface layer and inside of the sintered body. Also, NOx occlusion catalyst is carried on the surface of the ceramic sintered body and the inner surfaces of the communicated pores.

Abstract: A ceramic filter assembly having improved exhaust gas processing efficiency. The ceramic filter assembly (9) is produced by adhering with a ceramic seal layer (15) outer surfaces of a plurality of filters (F1), each of which is formed from a sintered porous ceramic body. The seal layer (15) has a thickness of 0.3 mm to 3 mm and a thermal conductance of 0.1 W/mK to 10 W/mk.

Abstract: A catalyst holding filter reducing a pressure loss. A catalyst holding filter (10) is made of a ceramic support (4) of SiC covered with a catalyst layer (2). An average pore size of the ceramic support is 10-250 &mgr;m, and a porosity of the ceramic support is 40-80%. The catalyst layer contains a catalyst, a cocatalyst and a support material.

Abstract: A ceramic filter assembly having improved exhaust gas processing efficiency. The ceramic filter assembly (9) is produced by adhering with a ceramic seal layer (15) outer surfaces of a plurality of filters (F1), each of which is formed from a sintered porous ceramic body. The seal layer (15) has a thickness of 0.3 mm to 3 mm and a thermal conductance of 0.1 W/mK to 10 W/mk.

Abstract: A regeneration system for an exhaust gas cleaning device disposed in an exhaust emission path of an internal combustion engine includes an exhaust gas cleaning honeycomb filter and a heating device for the filter, wherein the filter is a checkered SiC honeycomb filter having a given cell structure, and the heating device is a heater or a glow plug when using a fuel containing fuel additive.

Abstract: A regeneration system for an exhaust gas cleaning device disposed in an exhaust emission path of an internal combustion engine comprises an exhaust gas cleaning honeycomb filter and a heating means for the filter, wherein the filter is a checkered SiC honeycomb filter having a given cell structure, and the heating means is a heater or a glow plug when using a fuel containing fuel additive.

Abstract: A regeneration system for an exhaust gas cleaning device disposed in an exhaust emission path of an internal combustion engine has an exhaust gas cleaning honeycomb filter and a heating element for the filter, wherein the filter is a checkered SiC honeycomb filter having a given cell structure, and the heating element is a heater or a glow plug when using a fuel containing fuel additive.

Abstract: A regeneration system for an exhaust gas cleaning device disposed in an exhaust emission path of an internal combustion engine comprises an exhaust gas cleaning honeycomb filter and a heating means for the filter, wherein the filter is a checkered SiC honeycomb filter having a given cell structure, and the heating means is a heater or a glow plug when using a fuel containing fuel additive.

Abstract: Neuroprotective agents based on inhibition of kainic acid neurotoxicity and compounds useful as neuroprotective agents based on inhibition of kainic acid neurotoxicity. An inhibitors of kainic acid neurotoxicity, comprising as an active ingredient a pyridothiazine derivative represented by the following general formula (I) or a pharmaceutically acceptable salt thereof, and a pyridothiazine derivative represented by the following general formula (I) or a pharmaceutically acceptable salt thereof: ##STR1## wherein symbols in the formula have the following respective meanings: the ring A: a pyridine ring; ##STR2## R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 may be the same or different and each represent a hydrogen atom or a lower alkyl, cycloalkyl, alkenyl, aryl, carboxyl or lower alkoxycarbonyl group which may have substituent(s), or are not present, with the proviso that R.sup.2 and R.sup.

Abstract: A ring-shaped magnet (19) is bonded on or secured to the outer peripheral side of a rotor (21) which is borne by a rotary shaft (13) which constitutes a radial pneumatic dynamic pressure bearing. A ring-shaped magnet (23) is disposed so that it is spaced at a given distance from the ring-shaped magnet (19). The rotor (21) is restricted from moving in the axial direction and is rotatably supported in the radial direction by the magnetic attracting forces of two ring-shaped magnets (19, 23). The rotor (21) is eccentric by 0.5 relative to the axis of rotation by the difference in magnetic balance between the ring-shaped magnets (19, 23). Accordingly, the radial pneumatic dynamic pressure bearing generates a high dynamic pressure. The herringbone pneumatic dynamic pressure generating grooves (15a, 15b) generate a high dynamic pressure. They provide a very high radial load bearing ability to enhance the accuracy of rotation.