Abstract: A fastening member in an embodiment consists of a bolt and a nut. A hard layer made of a metal nitride is formed on a surface of a threaded portion of the bolt or a surface of a threaded portion of the nut.

Abstract: Provided is a method for efficiently producing recycled water-absorbing resin particles from, as a raw material, discarded water-absorbing resin particles derived from used sanitary supplies, etc., the recycled water-absorbing resin particles having decreased little in absorption property and having various excellent properties. The method for producing water-absorbing resin particles of the present invention comprises a polymerization step (I) in which an aqueous gel containing a crosslinked polymer (A) of a water-soluble vinyl monomer (a1) is obtained, a gel reduction step (II) in which the aqueous gel is reduced into particles to obtain aqueous-gel particles, a step (Va) in which resin particles including the crosslinked polymer (A) and obtained from the aqueous-gel particles are mixed with a surface-crosslinking agent (d), and a reaction step (Vb) in which the surface-crosslinking agent (d) is reacted.

Abstract: Provided is a method for producing water-absorbent resin particles, which is capable of improving the gel strength for the purpose of achieving a good balance between the absorption under load and the rate of liquid permeation through gel. The present invention is a method for producing water-absorbent resin particles, which is characterized by comprising a step wherein a monomer composition containing a water-soluble vinyl monomer (a1) and/or a vinyl monomer (a2) that turns into a water-soluble vinyl monomer (a1) by means of hydrolysis and a crosslinking agent (b) is polymerized in the presence of at least one organic main group element compound selected from the group consisting of organic iodine compounds, organic tellurium compounds, organic antimony compounds, and organic bismuth compounds.

Abstract: The present invention's purpose is to provide: a molecular-weight controlling agent for radical polymerization which enables controlled radical polymerization of a water-soluble monomer in an aqueous medium; a method for producing a polymer of a water-soluble vinyl monomer using the same; and a water-soluble vinyl monomer polymer. The present invention provides a molecular-weight controlling agent for radical polymerization characterized in that the agent comprises, as its active ingredient, an iodine compound represented by formula (1) and in that the solubility of the active ingredient in water is 0.5 weight % or more at 20° C. In the formula, R1 is —COOX, —CONR4R5, an aromatic group or a cyano group, X is a hydrogen atom, an aliphatic group, an alkali metal, an alkaline earth metal, an organic ammonium or an ammonium, and R2, R3, R4 and R5 are each independently a hydrogen atom, an aromatic group or an aliphatic group.

Abstract: Provided is an absorbent resin composition which has both improved absorbency under load and improved liquid permeability between swollen gels, which is free from blocking or discoloration during storage, and which does not generate any odors. The present invention is an absorbent resin composition containing: a crosslinked polymer (A) including, as an essential structural units, a crosslinking agent (b) and a water-soluble vinyl monomer (a1) and/or a vinyl monomer (a2) which produces the water-soluble vinyl monomer (a1) through hydrolysis; and a cationic organic polymer (c) having a number average molecular weight of 1,000,000 or higher, or a cationic organic polymer (B) that has a cationic group and that is obtained through polymerization of a monomer composition including, as essential components, a cationic monomer having an amino group (am) and/or a cationic monomer having a salt of an amino group (am).

Abstract: Provided is an absorbent resin composition which has both improved absorbency under load and improved liquid permeability between swollen gels, which is free from blocking or discoloration during storage, and which does not generate any odors. The present invention is an absorbent resin composition containing: a crosslinked polymer (A) including, as an essential structural units, a crosslinking agent (b) and a water-soluble vinyl monomer (a1) and/or a vinyl monomer (a2) which produces the water-soluble vinyl monomer (a1) through hydrolysis; and a cationic organic polymer (c) having a number average molecular weight of 1,000,000 or higher, or a cationic organic polymer (B) that has a cationic group and that is obtained through polymerization of a monomer composition including, as essential components, a cationic monomer having an amino group (am) and/or a cationic monomer having a salt of an amino group (am).

Abstract: Provided is a method for producing water-absorbent resin particles, which is capable of improving the gel strength for the purpose of achieving a good balance between the absorption under load and the rate of liquid permeation through gel. The present invention is a method for producing water-absorbent resin particles, which is characterized by comprising a step wherein a monomer composition containing a water-soluble vinyl monomer (a1) and/or a vinyl monomer (a2) that turns into a water-soluble vinyl monomer (a1) by means of hydrolysis and a crosslinking agent (b) is polymerized in the presence of at least one organic main group element compound selected from the group consisting of organic iodine compounds, organic tellurium compounds, organic antimony compounds, and organic bismuth compounds.

Abstract: Provided are aqueous-liquid absorbent resin particles in which the aqueous-liquid absorbent resin is not blocked regardless of working environment or weather condition, and that have excellent powder feedability and absorption performance under a load. The present invention pertains to aqueous-liquid absorbent resin articles (P) obtained by a production method comprising at least two steps of surface crosslinking step for crosslinking, by using a surface crosslinking agent (c), the surfaces of resin particles (B) containing a crosslinked polymer (A) of which the essential constitutional unit is formed of a water-soluble vinyl monomer (a1), and/or a vinyl monomer (a2) that becomes a water-soluble vinyl monomer (a1) through hydrolysis, and a crosslinking agent (b). The surface crosslinking agent (c) used is different between the first surface crosslinking step and the second crosslinking step.

Abstract: An imaging apparatus comprises an optical system that includes a plurality of lens groups, each lens group including one or more lenses, at least one of the lens groups being independently movable with respect to the other lens groups and including a focus lens group for focusing the subject and a lens control unit that controls movement of the plurality of lens groups to bring into focus based on a feeding position of the focus lens group.

Abstract: An operation apparatus includes a touch detection section, a vibration section, a setting section and a control section. The touch detection section is provided on an exterior part, and outputs a signal when touched by an user. The vibration section is provided on the touch detection section in an overlapping manner, and vibrates when the touch of the user is detected by the touch detection section. The setting section is configured to set a function to be carried out when the touch detection section is touched. The control section is configured to determine a touch position of the touch detection section, provided on the touch detection section of the determined touch position, and configured to cause the vibration section to vibrate, and output a signal used to cause the function.

Abstract: There is provided a zoom lens in which the load on the driving system for wobbling operation can easily made low and an image pickup apparatus equipped with the same. A zoom lens in which each of distances between a plurality of lens units changes during zooming from the wide angle end to the telephoto end, includes a focus lens unit that shifts along an optical axis to effect focusing from infinity to a close distance and a plurality of wobbling lens units that wobble after a shift of the focus lens unit at an amplitude smaller than the shift of the focus lens unit in focusing operation, wherein a combination of the wobbling lens units caused to operate changes in the middle of the zooming from the wide angle end to the telephoto end.

Abstract: An imaging apparatus comprises an optical system that includes a plurality of lens groups, each lens group including one or more lenses, at least one of the lens groups being independently movable with respect to the other lens groups and including a focus lens group for focusing the subject and a lens control unit that controls movement of the plurality of lens groups to bring into focus based on a feeding position of the focus lens group.

Abstract: An imaging apparatus comprises an optical system that includes a plurality of lens groups, each lens group including one or more lenses, at least one of the lens groups being independently movable with respect to the other lens groups and including a focus lens group for focusing the subject and a lens control unit that controls movement of the plurality of lens groups to bring into focus based on a feeding position of the focus lens group.

Abstract: An operation apparatus includes a touch detection section, a vibration section, a setting section and a control section. The touch detection section is provided on an exterior part, and outputs a signal when touched by an user. The vibration section is provided on the touch detection section in an overlapping manner, and vibrates when the touch of the user is detected by the touch detection section. The setting section is configured to set a function to be carried out when the touch detection section is touched. The control section is configured to determine a touch position of the touch detection section, provided on the touch detection section of the determined touch position, and configured to cause the vibration section to vibrate, and output a signal used to cause the function.

Abstract: There is provided a zoom lens in which the load on the driving system for wobbling operation can easily made low and an image pickup apparatus equipped with the same. A zoom lens in which each of distances between a plurality of lens units changes during zooming from the wide angle end to the telephoto end, includes a focus lens unit that shifts along an optical axis to effect focusing from infinity to a close distance and a plurality of wobbling lens units that wobble after a shift of the focus lens unit at an amplitude smaller than the shift of the focus lens unit in focusing operation, wherein a combination of the wobbling lens units caused to operate changes in the middle of the zooming from the wide angle end to the telephoto end.

Abstract: A zoom lens according to the present invention includes, in order from the object side to the image side, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a negative refracting power, and a fourth lens unit having a positive refracting power, wherein during zooming from the wide angle end to the telephoto end, the first lens unit, the second lens unit, the third lens unit, and the fourth lens unit move in such a way that they are located closer the object side at the telephoto end than at the wide angle end, the distance between the first lens unit and the second lens unit is larger at the telephoto end than at the wide angle end, the distance between the second lens unit and the third lens unit is larger at the telephoto end than at the wide angle end, and the distance between the third lens unit and the fourth lens unit is smaller at the telephoto end than at the wide angle end.

Abstract: A zoom lens includes, from an object side in the following order: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; a third lens group that has a positive refractive power; and a fourth lens group that has a positive refractive power, wherein: when magnification is changed from a wide angle end to a telephoto end, the lens groups each move so as to increase the distance between the first and second lens groups and to decrease the distance between the second and third lens groups and the distance between the third and fourth lens groups; and the following conditional expressions (1) and (2) are satisfied: 5.5<f1/fw<8.0??(1); and 0.5<?d3/?d4<0.

Abstract: An imaging apparatus comprises an optical system that includes a plurality of lens groups, each lens group including one or more lenses, at least one of the lens groups being independently movable with respect to the other lens groups and including a focus lens group for focusing the subject and a lens control unit that controls movement of the plurality of lens groups to bring into focus based on a feeding position of the focus lens group.

Abstract: Provided is an electroconductive coating composition which is soluble in solvent and exhibits excellent proccessability, and the electric conductivity of which rarely lowers even under high temperature conditions. An electroconductive coating composition (A) characterized by containing both a substituted polythiophene (P) and a dopant (D), said substituted polythiophene (P) being a polythiophene in which at least some of the thiophene repeating unit are each a thiophene repeating unit (?) which is substituted at the 3-position and/or the 4-position of a thiophene ring by (a) a polyether group that comprises 1 to 9 C2-4 oxyalkylene group repeating units and that has a C1-15 alkoxy group at one terminal, (b) an alkoxy group, (c) an alkoxyalkyl group, or (d) an alkyl group that is substituted or unsubstituted by the polyether group (a).

Abstract: A zoom lens system includes, in order from an object side, a first lens unit G1 having a positive refracting power, a second lens unit G2 having a negative refracting power, a third lens unit G3 having a positive refracting power, and a fourth lens unit G4 having a positive refracting power, and at the time of zooming from a wide angle end to a telephoto end, a space between the lens units changes, and the second lens unit includes not more than three lenses, and a biconcave negative lens which satisfies the following conditional expression (1) is disposed nearest to the object side, in the second lens unit, and (the zoom lens system) is characterized by satisfying the following conditional expression (2) ?0.1<SF2n1<0.5??(1) 3.0<ft/fw<12.0??(2).