Abstract: A partition member for dividing a fluid chamber into a main fluid chamber and a sub-fluid chamber is provided with an idle orifice passage of which the opening is opened and closed by a seating section provided on part of a diaphragm. A pushing member is provided to control the opening and closing operation. The seating member is formed thick of which the upper and lower surfaces are provided with depressions respectively. The seating member is also provided with a thin section of which the periphery is provided with a hemispheric protrusion and a seal of a substantially right triangle cross section. An elastic body section is also provided at the side surface with a lateral membrane section.

Abstract: A partition member for dividing a fluid chamber into a main fluid chamber and a sub-fluid chamber is provided with an idle orifice passage of which the opening is opened and closed by a seating section 20 provided on part of a diaphragm 15. A pushing member is provided to control the opening and closing operation. The seating member 20 is formed thick of which the upper and lower surfaces are provided with depressions 51, 52 respectively. The seating member 20 is also provided with a thin section 53 of which the periphery is provided with a hemispheric protrusion 54 and a seal 55 of a substantially right triangle cross section. An elastic body section 3 is also provided at the side surface with a lateral membrane section.

Abstract: A first connecting member is connected to a second connecting member by an elastic body member. A fluid chamber which is formed inside the first connecting member, the second connecting member and the elastic body member is divided into a main fluid chamber 17 and a sub-fluid chamber 18 by a partition member 15. An idle orifice 20 and a damping orifice 21 communicate with both chambers. In a part of a side wall member 9 which forms the main fluid chamber 17 is formed a round hole 10 which is covered by a part of the elastic body member to form a horizontally movable membrane 11. A circular wall 44 is integrally formed with the partition member 15 to face the horizontal movable membrane 11 at predetermined intervals. Resonance of the horizontal membrane 11 generated as a result of fluctuations of internal pressure in the main fluid chamber is controlled by the circular wall 44.

Abstract: A first connecting member is connected to a second connecting member by an elastic body member. A fluid chamber which is formed inside the first connecting member, the second connecting member and the elastic body member is divided into a main fluid chamber 17 and a sub-fluid chamber 18 by a partition member 15. An idle orifice 20 and a damping orifice 21 communicate with both chambers. In a part of a side wall member 9 which forms the main fluid chamber 17 is formed a round hole 10 which is covered by a part of the elastic body member to form a horizontally movable membrane 11. A circular wall 44 is integrally formed with the partition member 15 to face the horizontal movable membrane 11 at predetermined intervals. Resonance of the horizontal membrane 11 generated as a result of fluctuations of internal pressure in the main fluid chamber is controlled by the circular wall 44.

Abstract: An active control apparatus using an adaptive IIR digital filter includes a coefficient control portion for updating the filter coefficient of adaptive IIR digital filter so as to minimize an output error signal level, and a coefficient control portion for updating the filter coefficient of a recursive portion so as to minimize the output level of recursive portion. The filter coefficient of recursive filter is updated by these two coefficient control portions and in parallel or in a time-dividing manner.

Abstract: A process for purifying an aqueous acrylamide solution which has been obtained through catalytic hydration of acrylonitrile in the presence of a copper-containing catalyst, by the steps of passing said solution through a OH-form strongly basic anion exchange resin layer and then, through a H-form cation exchange resin layer, is disclosed.

Abstract: A process for purifying an aqueous acrylamide solution which has been obtained by catalytic hydration of acrylonitrile with water in the presence of a copper-containing catalyst is disclosed, said process comprising passing said solution through a weakly basic anion exchange resin having primary and/or secondary amino groups, said resin being replaced with a new one after the use without regeneration.