Abstract: A light absorbing member includes a ceramic composite having a plurality of first ceramic particles exhibiting positive resistance temperature characteristics in a first ceramics having an open porosity of 5% or lower.

Abstract: A base is metal, ceramic, or a complex combining thereof, and has thereon multiple concave-convex patterns that are provided at one or more pitches equal to or less than 2 ?m, and a surface part 1a of the base 1 is porous.

Abstract: A member for hydrogen production includes a ceramic composite in which a plurality of ceramic particles having an average particle diameter ranging from 5 nm to 200 nm are dispersed in a porous insulator having a different component from the ceramic particles. The ceramic particles comprise at least one substance selected from the group consisting of AXO3±? (where 0???1, A: at least one of rare earth elements, alkaline earth elements, and alkali metal elements, X: at least one of transition metal elements and metalloid elements, and O: oxygen), cerium oxide, and zirconium oxide as a main component.

Abstract: A light absorbing member includes a ceramic composite having a plurality of first ceramic particles exhibiting positive resistance temperature characteristics in a first ceramics having an open porosity of 5% or lower.

Abstract: A member for hydrogen production includes a ceramic composite in which a plurality of ceramic particles having an average particle diameter ranging from 5 nm to 200 nm are dispersed in a porous insulator having a different component from the ceramic particles. The ceramic particles comprise at least one substance selected from the group consisting of AXO3±? (where 0???1, A: at least one of rare earth elements, alkaline earth elements, and alkali metal elements, X: at least one of transition metal elements and metalloid elements, and O: oxygen), cerium oxide, and zirconium oxide as a main component.

Abstract: A base is metal, ceramic, or a complex combining thereof, and has thereon multiple concave-convex patterns that are provided at one or more pitches equal to or less than 2 ?m, and a surface part 1a of the base 1 is porous.

Abstract: [Object] To efficiently recover tungsten from an object containing tungsten by a simple treatment process using a microorganism with reduced environmental load. [Solution] A method for recovering a tungsten compound is provided which includes the step of preparing a tungsten compound solution in which tungsten-containing polyatomic ions are dissolved, by eluting the metal component of an object containing tungsten into an alkaline solution; the adsorption step of adsorbing the tungsten-containing polyatomic ions to a microorganism by introducing the microorganism to the tungsten compound solution and adjusting the tungsten compound solution to an acidic level; and the collecting and washing step of collecting the microorganism to which the tungsten-containing polyatomic ions are adsorbed and washing the microorganism.

Abstract: [Object] To efficiently recover tungsten from an object containing tungsten by a simple treatment process using a microorganism with reduced environmental load. [Solution] A method for recovering a tungsten compound is provided which includes the step of preparing a tungsten compound solution in which tungsten-containing polyatomic ions are dissolved, by eluting the metal component of an object containing tungsten into an alkaline solution; the adsorption step of adsorbing the tungsten-containing polyatomic ions to a microorganism by introducing the microorganism to the tungsten compound solution and adjusting the tungsten compound solution to an acidic level; and the collecting and washing step of collecting the microorganism to which the tungsten-containing polyatomic ions are adsorbed and washing the microorganism.

Abstract: A ceramic sintered body contains Al2O3 crystal grains, internal TiC crystal grains existing in the Al2O3 crystal grains and external TiC crystal grains other than the internal TiC crystal grains. The Al2O3 crystal grains and the external TiC crystal grains retain stress caused by the difference in thermal expansion coefficient remaining after sintering, so that the Al2O3 crystal grains and the external TiC crystal grains pull each other in the interface therebetween. As a result, when the ceramic sintered body is machined, micro-cracks generated in the interface can easily grow due to the residual stress in addition to the shearing force caused by the machining operation, so that machinability is improved.

Abstract: Greater emphasis has been placed on smoothness of the floating surface for the applications with floating height of 10 nm or less. To obtain a smooth floating surface, it must be polished with diamond abrasive having a mean particle size of 0.1 ?m or less, and conventional ceramic sintered body has poor machinability and it is impossible to use the magnetic heads made of this ceramic sintered body at a floating height of 10 nm or less. The ceramic sintered body according to the present invention contains Al2O3 crystal grains, internal TiC crystal grains existing in the Al2O3 crystal grains and external TiC crystal grains other than the internal TiC crystal grains. The Al2O3 crystal grains and the external TiC crystal grains retain stress caused by the difference in thermal expansion coefficient remaining after sintering, so that the Al2O3 crystal grains and the external TiC crystal grains pull each other in the interface therebetween.

Abstract: An oxygen sensor forming a sensing element which comprises a solid electrolytic substrate of ziconia of the shape of an elongated flat plate, a measuring electrode and a reference electrode which are formed of platinum, said measuring electrode and said reference electrode being formed on both opposing surfaces at an end of said solid electrolytic substrate so as to be opposed to each other, wherein said measuring electrode has an electrode area of from 8 to 18 mm2, and said sensing element has a width w of from 2.0 to 3.5 mm at the end of the solid electrolytic substrate. The oxygen sensor exhibits excellent gas response performance, can be quickly heated and is small in size.

Abstract: An oxygen sensor device consisting a cylindrical tube of a ceramic solid electrolyte having an oxygen ion conducting property, a reference electrode formed on an inner surface of the cylindrical tube, and a measuring electrode formed on an outer surface of the cylindrical tube at a position at least opposed to the reference electrode, wherein a ceramic layer is formed on the outer surface of the cylindrical tube, the ceramic layer having an opening portion for exposing the surface of the measuring electrode and incorporating a heat-generating member therein, the heat-generating member being buried surrounding the opening portion. The oxygen sensor device as a whole has a cylindrical shape relaxing the concentration of thermal stress and exhibiting excellent thermal shock resistance. With the heat-generating member being buried near the sensing portion, the sensing portion is heated up to a predetermined activating temperature within short periods of time exhibiting an excellent sensor response.

Abstract: Electrically conducting ceramics having, as a chief crystalline phase, a perovskite crystalline phase containing La, Cr and Mg and further having, in addition to the chief crystalline phase, an oxide phase containing La, wherein when the atomic ratios among the rare earth element, Mg and Cr in said chief crystalline phase are represented by the following formula,R:Mg:Cr=x:y:zwherein R denotes rare earth elements at least part of which being La, the atomic ratios among the rare earth element, Mg and Cr contained in the whole ceramics are represented by the following formula,R:Mg:Cr=(x+u):(y+v):zwherein R, x to z are as defined above, and u and v are the numbers satisfying the following formulas,0.0001.ltoreq.u/(x+y+z).ltoreq.0.20,0.01.ltoreq.(y+v)/(x+y+z).ltoreq.0.60, and 0.ltoreq.v.The ceramics is dense, exhibits excellent sintering property at low temperatures, has high electric conductivity, and remains stable in a reducing atmosphere.

Abstract: The present invention is an electrically conducting ceramic having improved electrical conductivity which comprises a perovskite-type composite oxide of a composition represented by the following formula(La.sub.1-x-y A.sub.x B.sub.y).sub.z (Mn.sub.1-u C.sub.u).sub.v O.sub..delta.wherein A represents at least one type of atom selected from the group consisting of Sc, Y, Nd, Yb, Er, Gd, Sm and Dy, B represents at least one type of atom selected from the group consisting of Ba, Sr and Ca, and C represents at least one type of atom selected from the group consisting of Co, Fe, Ni, Ce, Zr, Mg, Al, Sb and Cr, and x, y, z, u, v and .delta. are the numbers that satisfy the following formulas:0.02.ltoreq.x.ltoreq.0.5,0.1.ltoreq.y.ltoreq.0.6,0.90.ltoreq.z.ltoreq.1.05,0.ltoreq.u.ltoreq.0.5,v=1.0,and at a temperature of 1000.degree. C. in the open air,2.97.ltoreq..delta..ltoreq.3.04.