Abstract: A filter comprising a columnar honeycomb structure part, the columnar honeycomb structure part including: a plurality of first cells each extending from a first bottom surface to a second bottom surface of the columnar honeycomb structure part, the first bottom surface being opened and the second bottom surface being plugged for the plurality of first cells; a plurality of second cells each extending from the first bottom surface to the second bottom surface of the columnar honeycomb structure part, the first bottom surface being plugged and the second bottom surface being opened for the plurality of second cells; and porous cordierite partition walls that define the first cells and the second cells, the partition walls having an average pore depth of 1.5 ?m or more and 3.5 ?m or less as measured by a laser microscope, and a porosity of from 50 to 60% as measured by a mercury porosimeter.

Abstract: A honeycomb structure has grooves dented inwardly from the surfaces of the partition walls along a cell direction An open width of an open end of the groove is 0.015-0.505 mm and smaller than the open width a length of one side of each of the cells with the grooves, a bottom width of a bottom of the groove is 0.01-0.5 mm and smaller than the open width, a height from the bottom of the groove to the open end is 0.01-0.05 mm, a thickness of the partition wall in a groove portion is 50 ?m or more, a ratio of the number of the cells with the grooves to the number of the total cells is 80% or more, and a value obtained by subtracting the open frontal area when the grooves excluded from the open frontal area when the grooves included is 0.1-8.0%.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure body having a porous partition wall surrounding cells each of which has one end plugged by a plugging portion. An open frontal area O (%) of the cells in the honeycomb structure body is 75 to 80%, a porosity P (%) of the partition wall measured by a mercury press-in method is 52 to 58%, an average pore diameter D (?m) of the partition wall measured by the mercury press-in method is 6 to 12 ?m, and a pore volume rate A (%) of pores whose pore diameters are not less than 20 ?m with respect to an overall pore volume of the partition wall is not more than 13.5%.

Abstract: A method for producing a reaction product, with which the reaction product is obtained from a starting material through a particular organic synthesis reaction, the method includes (a) a step of setting a target wavelength to a peak wavelength of a reaction region involved in the organic synthesis reaction in an infrared absorption spectrum of the starting material; (b) a step of preparing an infrared heater that emits an infrared ray having a peak at the target wavelength from a structure constituted by a metal pattern, a dielectric layer, and a metal substrate stacked in this order from an outer side toward an inner side; and (c) a step of obtaining the reaction product by allowing the organic synthesis reaction to proceed while the infrared ray having a peak at the target wavelength is being applied to the starting material from the infrared heater.

Abstract: A honeycomb filter includes a honeycomb structure body having porous partition walls arranged to surround cells, in a cross section of the honeycomb structure body which is perpendicular to an extending direction of the cells, a value of a porosity of the partition wall in a partitioning region between the inflow cell and the outflow cell is defined as a porosity A, among intersecting portions where partitioning regions of the partition walls between the cells intersect one another, a value of a porosity of the partition wall in an intersecting portion between the two inflow cells is defined as a porosity B, and a value of A/B obtained by dividing the porosity A by the porosity B is from 0.50 to 0.95.

Abstract: A joined body 10 is manufactured by joining a Mo- or Ti-made terminal 14 having a Ni coating, a Au coating, a Ni—Au coating (with Ni Serving as a base) to a recess 12a formed in a plate-shaped ceramic member 12 made of alumina or aluminum nitride through a joint layer 16. The joint layer 16 contains Au, Sn, Ag, Cu, and Ti and is in contact with a bottom surface of the recess 12a and with at least part of a side surface of the recess 12a (the entire side surface in this case). In the joint layer 16, its joint interface with the ceramic member 12 is Ti-rich. When the joined body 10 is cut in its thickness direction, the ratio of the total cross sectional area of pores to the cross-sectional area of the joint layer 16 (porosity) is 0.1 to 15%.

Abstract: A method for inspecting an end face, comprising: an arrangement step of arranging a honeycomb structure having a partition wall extending from a first end face to a second end face, at a predetermined position using the second end face as a placement face; a first image data for processing acquisition step of acquiring first image data for processing while irradiating the first end face with light having an angle of 40° or more, the angle being an angle formed between the light and an axis being perpendicular to the placement face of the honeycomb structure; a second image data for processing acquisition step of acquiring second image data for processing while irradiating the first end face with light having an angle of less than 40°; and a crack detection step of detecting a crack by comparing the first image data for processing with the second image data for processing.

Abstract: A honeycomb filter includes a plugged honeycomb structure body which has cell rows arranged along one direction in a cross section of the honeycomb structure body and including a first cell row constituted of inflow cells and a second cell row including outflow cells. A width P1 (mm) of the first cell row, a width P2 (mm) of the second cell row and a curvature radius R (?m) of a curved shape of corner portions of a polygonal shape of each cell satisfy relations of Equations (1) and (2) below: Equation (1): 2?100?(P1/P2×100)?50, and Equation (2): 0.4?(R/1000)/((P1+P2)/2)×100?20.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls placed, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face; and porous plugging portions provided either at the ends on the inflow end face side of the cells or at the ends on the outflow end face side of the cells, wherein the plugging portions include plugging portions that have voids therein, and in the plugging portions having the voids, porosity including the voids as pores ranges from 68% to 83%.

Abstract: A honeycomb structure includes a plurality of prismatic columnar shaped honeycomb segments; a bonding layer bonding side faces of the honeycomb segments; and a circumferential wall disposed to surround a honeycomb segment bonded body having the honeycomb segments arranged in a grid pattern and bonded with the bonding layer, wherein the honeycomb segments has a porous partition wall disposed to surround a plurality of cells, the cells in other than outermost circumference have a hexagonal shape in a section orthogonal to the cell extending direction, the honeycomb segments include first and second honeycomb segment, the second honeycomb segment is different from the first in at least one of: a shape in the section; a size; and an arrangement direction of the cells and an extended line of one diagonal line imaginarily depicted in the cells in the first honeycomb segment and that in the second are configured to be orthogonal.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face, and porous plugging portions provided either at the ends on the inflow end face or the outflow end face of the cells, wherein the plugging portions are composed of a porous material, the honeycomb structure has a central region and a circumferential region, and a ratio of an area of the circumferential region with respect to that of the central region ranges from 0.1 to 0.5, a plugging length L1 in the cell extending direction of a central plugging portion in the central region is larger than a plugging length L2 of a circumferential plugging portion in the circumferential region, L1 ranges from 7 to 9 mm, and L2 from 3 to 6 mm.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face, and a porous plugging portion provided either at an end on the inflow end face or the outflow end face of the cells, wherein the plugging portion is composed of a porous material, the honeycomb structure has a central region and a circumferential region, and a ratio of an area of the circumferential region with respect to that of the central region ranges from 0.1 to 0.5, porosity of a central plugging portion in the central region is lower than that of a circumferential plugging portion in the circumferential region, and the porosity of the central plugging portions ranges from 60% to 68%, and that of the circumferential plugging portions ranges from 70% to 85%.

Abstract: A method for manufacturing a ceramic product containing silicon carbide, including a step of firing a formed body of a green body containing silicon carbide by transporting the formed body from an inlet to an outlet of a continuous furnace, wherein the continuous furnace includes the inlet, a heating zone, a cooling zone, and the outlet in this order, and a furnace atmosphere in both the heating zone and the cooling zone is an inert gas having an oxygen concentration of 100 ppm by volume or less.

Abstract: A honeycomb structure includes a pillar-shaped honeycomb structure body having a porous partition wall defining a plurality of cells serving as fluid through channel extending from an inflow end face to an outflow end face; and a circumferential wall surrounding the partition wall, wherein in a plane orthogonal to cell extending direction, the honeycomb structure body has a circumferential cell structure, a center cell structure having a cell structure different from the circumferential cell structure, and a boundary wall, the honeycomb structure body has intersection parts of the partition wall, including basic intersection parts and thick intersection parts having a thickness larger than that of the basic intersection parts, the thick intersection parts include at least one of: first thick intersection parts and second thick intersection parts, and in the circumferential cell structure, the intersection parts at least include the circumferential basic intersection parts.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face, and porous plugging portions provided either at the ends on the inflow end face or the outflow end face of the cells, wherein the plugging portions are composed of a porous material, the honeycomb structure has a central region and a circumferential region and a ratio of an area of the circumferential region with respect to that of the central region ranges from 0.1 to 0.5, and a plugging length L1 in the cell extending direction of a central plugging portion in the central region is smaller than a plugging length L2 of a circumferential plugging portion in the circumferential region, L1 ranges from 3 to 6 mm, and L2 from 7 to 9 mm.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face, and porous plugging portions provided either at the ends on the inflow end face side or the outflow end face side of the cells, wherein the plugging portions are composed of a porous material, the honeycomb structure has a central region and a circumferential region, and a ratio of an area of the circumferential region with respect to that of the central region ranges from 0.1 to 0.5, porosity of a central plugging portion in the central region, is higher than that of a circumferential plugging portion in the circumferential region, and the porosity of the central plugging portion ranges from 76% to 85%, and that of the circumferential plugging portion from 60% to 75%.

Abstract: A piezoelectric element includes a piezoelectric body having a main phase configured by lead zirconate titanate and a heterogenous phase configured by a different component to lead zirconate titanate, and a pair of electrodes provided on the piezoelectric body. The piezoelectric body has a surface region within 10 ?m of a surface, and an inner region more than 10 ?m from the surface. A surface area coverage of the heterogenous phase in a cross section of the surface region is at least 0.75% greater than a surface area coverage of the heterogenous phase in a cross section of the inner region.

Abstract: An air electrode has a plurality of carbon nanotubes and a plurality of layered double hydroxide particles. The plurality of layered double hydroxide particles is supported on the plurality of carbon nanotubes.