Abstract: A honeycomb structure in which the inlet cells have a larger opening ratio than the outlet cells and the generation of cracks is suppressed effectively.

Abstract: The honeycomb structure comprising a plurality of columnar honeycomb segments in which two kinds of plural through-holes different in end face area are formed side by side by being surrounded by partition walls, each honeycomb segment having, at one end face, an inlet side of high opening ratio, wherein through-holes of smaller end face area are plugged and, at other end face, an outlet side of low opening ratio and wherein through-holes of larger end face area are plugged, the plurality of honeycomb segments being bonded to each other via a bonding material in the longitudinal direction of each honeycomb segment. The bonded width of the bonding material is larger at the inlet side end face of the honeycomb structure than at the outlet side end face is presented.

Abstract: A catalyst-carrying filter includes a gas-inflow-side layer and a gas-outflow-side layer, the gas-inflow-side layer including a PM collection layer that has a small average pore size and a PM removal catalyst layer that supports or is coated with an oxidizing catalyst, and the gas-outflow-side layer including a gas purification catalyst layer that supports or is coated with a gas purification catalyst.

Abstract: There is disclosed a plugged honeycomb structure having a PM collection capability which is not easily deteriorated even when used as a DPF in an exhaust system where broken metal pieces, sputter depositions and the like flow as loads. The plugged honeycomb structure includes plugging portions having depths of 2.0 mm or more and 12 mm or less, plug punch out strengths per unit length in a range of 3 MPa/mm or more and 50 MPa/mm or less, hydraulic diameters of 0.95 mm or more and less than 2.20 mm and porosities of 40% or more and 80% or less.

Abstract: A ceramic filter having a honeycomb structure 10 having a large number of cells which are extending in the longitudinal direction and which are alternatively plugged on an exhaust gas G inlet side end face 10a and an exhaust gas G outlet side end face 10b to form plugged portions. The depth of the inlet side plugged portions (filler 16) is formed deeper than that of the outlet side plugged portions (filler 16). Since the exhaust gas G tends to have a decreased turbulent flow and an increased laminar flow on the inlet side, a partial accumulation of Oil-Ash on portions near an outlet side end face can be inhibited.

Abstract: The ceramic filter structure 1 of the present invention comprises plural cells defined by partition walls 2 having a porous structure to form flow passages of fluid, plugged portions being formed at one open end portion of specified cells and another open end portion of the remaining cells to allow partition walls 2 to serve as filtration layers, wherein the ratio (S2/S1) of the actual area (S2) of the portion 10 of all actual area of one surface 7 of a specified region 6 of partition walls 2 which can be viewed from a vertical direction to a plane of projection obtained by vertically projecting the specified region 6 of partition walls 2 on a plane from the one surface 7 side to the area (S1) of the said plane 8 of projection is 5-30. This ceramic filter structure can reduce pressure loss increase at time of collecting particulates.

Abstract: There is provided a honeycomb structure which is useful as a trapping filter for exhaust gas, especially as a DPF for a diesel engine and capable of effectively inhibiting defects such as a crack due to thermal stress from being generated upon use and regeneration. The honeycomb structure is provided with a honeycomb segment bonded body obtained by unitarily bonding a plurality of honeycomb segments at bonded faces via a bonding material layer and the outer periphery coat layer and has a structure having a plurality of cells functioning as fluid passages disposed in parallel with one another in a direction of a central axis. The honeycomb structure is characterized in that a bonding cross portion where two or more bonding material layers cross has a smaller thermal capacity than those of bonding portions other than the bonding cross portion.

Abstract: This invention provides a compound or its pharmaceutically-acceptable salt of formula (I) wherein R1 represents a lower alkyl group et al; R2 and R3 are same and different and represents hydrogen atm et al; R4 represents the substituent of the formula (I) et al; X1 represents NH, O or S; Y represents N or C; Ar is a divalent substituent derived from aryl et al, by removing two hydrogen atoms therefrom; the ring A represents a 5- or 6-membered heteroaryl group; this compounds has a histamine-H3 receptor antagonistic effect or a histamine-H3 receptor inverse-agonistic effect and is useful for preventive or remedy of metabolic system diseases, circulatory system diseases or nervous system diseases.

Abstract: The present invention provides a ?? modulator of a frequency modulation system that can lessen the requirement of linearity for an oscillator. A ?? modulator comprises an oscillating apparatus that changes a frequency thereof according to an input signal, a quantizing means for quantizing a frequency modulation signal output from the oscillating apparatus, and an operation means for applying an operation to a digital signal output from the quantizing means. The oscillating apparatus comprises an oscillator that changes a frequency thereof according to the input signal, a reference signal source that outputs a reference signal at a predetermined frequency, a mixer that receives the signals from the oscillator and the reference signal source, and a low-pass filter that passes a low frequency component of a signal output from the mixer. The center oscillation frequency of the oscillator is set higher than a target center oscillation frequency of the frequency modulation signal.

Abstract: A honeycomb segment 3 includes a plurality of cells 5 functioning as fluid passages and disposed in parallel with one another in the central axis direction. Cells at four corners of both end faces of the honeycomb segment 3 are plugged with a plugging material 7. Since occurrence of chipping or a crack during handling before joining honeycomb segments can be reduced, productivity and yield of a honeycomb structure can be improved with the honeycomb segment.

Abstract: A ceramic filter having a honeycomb structure 10 having a large number of cells which are extending in the longitudinal direction and which are alternatively plugged on an exhaust gas G inlet side end face 10a and an exhaust gas G outlet side end face 10b to form plugged portions. The depth of the inlet side plugged portions (filler 16) is formed deeper than that of the outlet side plugged portions (filler 16). Since the exhaust gas G tends to have a decreased turbulent flow and an increased laminar flow on the inlet side, a partial accumulation of Oil-Ash on portions near an outlet side end face can be inhibited.

Abstract: A honeycomb structure 1 includes: porous partition walls 6 having a large number of pores which are disposed to form a plurality of cells 5 functioning as exhaust gas flow passages between two end faces of the walls 6, and plugged portions 7 formed by alternately plugging either end portion of the end faces of respective cells 5. A whole structure of the honeycomb structure 1 is composed of honeycomb segments 2 which have been separated into two or more in a plane parallel to a central axis. The segments 2 includes a specific segment 2X having properties different from those of general segments 2a other than the specific segment 2X, and additional plugged portions 8 are disposed in the unplugged opening end portions 7 which are not plugged among cells of the specific segment, thereby at least a part of exhaust gas flow is suppressed.

Abstract: A honeycomb filter 1 includes: partition walls separating and forming a plurality of cells extending in a direction of a central axis 21, and a catalyst loaded on the partition wall. A region (central unloaded portion) 4 from one end portion (outlet side end portion) 12 in the direction of the central axis to at least ½ of length in the direction of the central axis in a central portion 2 including the central axis 21 and excluding an outer periphery 22 is a catalyst-unloaded region, a region (outer peripheral unloaded portion) 5 from the outlet side end portion 12 to ? or less of length in the direction of the central axis in the central unloaded portion 4 is a catalyst-unloaded region, and a portion excluding the central unloaded portion 4 and the outer peripheral unloaded portion 5 from the whole is a catalyst-loaded portion. The honeycomb filter can inhibit catalyst deterioration, occurrence of crack, and melting and raise regeneration efficiency.

Abstract: There is disclosed a plugged honeycomb structure capable of suppressing a rise of a pressure loss. A plugged honeycomb structure 1 of the present invention comprises a columnar honeycomb structure 2 having porous partition walls 4 and a plurality of cells 5 which are defined by the partition walls 4 and which extend through the structure from one end surface 7a to the other end surface 7b thereof; a plurality of first plugging members 3a which plug openings of predetermined cells 5a on a side of the one end surface 7a; and a plurality of second plugging members 3b which plug openings of the remaining cells 5b on a side of the other end surface 7b. In the plugged honeycomb structure 1, the first plugging member 3a includes a convex portion 6 having a shape convex toward the center of the cell 5 in an axial direction on an end portion of the member on a side opposite to the end surface 7a in which the cell 5a to be plugged is opened.

Abstract: A honeycomb segment 3 includes a plurality of cells 5 functioning as fluid passages and disposed in parallel with one another in the central axis direction. Cells at four corners of both end faces of the honeycomb segment 3 are plugged with a plugging material 7. Since occurrence of chipping or a crack during handling before joining honeycomb segments can be reduced, productivity and yield of a honeycomb structure can be improved with the honeycomb segment.

Abstract: A filling percentage of a central portion is larger than that of a peripheral portion at the inlet end surface of an exhaust gas of a honeycomb segment (2) constituting a ceramic filter due to additional filling (13). Thus, an amount of soot accumulated in vents (5) in the central portion of each honeycomb segment (2) is less relative to that in the peripheral portion. This decreases a quantity of heat generated by burning of soot in the central portion, and reduces temperature rise during recycling, thus limiting the maximum temperature of the ceramic filter (1).

Abstract: A honeycomb structure includes a honeycomb segment joined body comprising a plurality of honeycomb segments unitarily joined at joint faces thereof by means of a bonding material layer, and an outer peripheral coat layer, the honeycomb structure having a plurality of cells functioning as fluid passages disposed in parallel with one another in a central axis direction. A thickness of the outer peripheral coat layer at least at one portion of the portions (portions on end faces) located on end faces in longitudinal direction of the bonding material layer in a cross-section in a direction perpendicular to the central axis direction is larger than an average thickness of the portions other than the portions on end faces.

Abstract: The ceramic filter structure 1 of the present invention comprises plural cells defined by partition walls 2 having a porous structure to form flow passages of fluid, plugged portions being formed at one open end portion of specified cells and another open end portion of the remaining cells to allow partition walls 2 to serve as filtration layers, wherein the ratio (S2/S1) of the actual area (S2) of the portion 10 of all actual area of one surface 7 of a specified region 6 of partition walls 2 which can be viewed from a vertical direction to a plane of projection obtained by vertically projecting the specified region 6 of partition walls 2 on a plane from the one surface 7 side to the area (S1) of the said plane 8 of projection is 5-30. This ceramic filter structure can reduce pressure loss increase at time of collecting particulates.

Abstract: There is disclosed a honeycomb filter 1 having: an inflow end face 42 and an outflow end face 44 of a fluid to be treated; porous partition walls 2 extending to the outflow end face 44 from the inflow end face 42; and a large number of through channels 3a and 3b partitioned by the partition walls 2 and extending through the outflow end face 44 from the inflow end face 42, predetermined through channels 3a are sealed in the inflow end face, and the remaining predetermined through channels 3b are sealed in the outflow end face 44. In a case where a total of sectional areas of the through channels 3a sealed in the inflow end face 42 is A (mm2), and a total of sectional areas of the through channels sealed 3b in the outflow end face is B (mm2), a relation is A<B in the honeycomb filter 1. The honeycomb filter has only slight increase of a pressure loss with an elapse of time by the use.

Abstract: To provide an optical switcher capable of sending incident light on one input port to any plurality of output ports. The optical switcher includes input ports disposed on extensions of m input optical paths (m being 2 or greater natural number), output ports disposed on extensions of n output optical paths (n being 2 or greater natural number), and movable translucent switch mirrors 311-3mn, disposed at intersections of the m input optical paths and the n output optical paths, for switching between the input optical paths and the output optical paths. A switch mirror 311-3mn located nearer the input ports has a higher transmittance.