Abstract: The present invention provides a dresser for a chemical and mechanical polishing cloth wherein a bonding material for retaining diamond grit is not dissolved and contamination of chemical slurry caused by dissolving of metal or peeling-off of diamond grit is prevented from occurring. A sintered product constituting the dressing face 2a is obtained by mixing a bonding material 4 consisting of silicon and/or silicon alloy with diamond grit 3, and forming and sintering the mixture. A carbide film 5 generated by sintering silicon in the bonding material into diamond is formed on the surface of the diamond grit 3. Thereby, the diamond grit is firmly bonded with the bonding material, and the bonding material is not dissolved. As a result, the contamination of the chemical slurry or the peeling-off of the diamond grit is prevented.

Abstract: A zoom lens comprises a plurality of optical elements each of which includes a transparent body having two refracting surfaces and a plurality of reflecting surfaces and is arranged so that a light beam enters the transparent body from one of the two refracting surfaces, repeatedly undergoes reflection, and exits from the other of the two refracting surfaces, and/or a plurality of optical elements on each of which a plurality of reflecting surfaces made from front surface mirrors are integrally formed, and each of which is arranged so that an entering light beam repeatedly undergoes reflection by the plurality of reflecting surfaces and exits from the optical element.

Abstract: In an optical element for reflecting light from an incidence surface of the optical element by one or more reflecting surfaces comprising off-axial curved surfaces, and causing the light to emerge from an emergence surface, at least one of the incidence surface, the emergence surface and the reflecting surface diffracting the light.

Abstract: A hydrolyzable group end-blocked organopolysiloxane is prepared by reacting (A) an organopolysiloxane having a silanol group at each end of its molecular chain with (B) an organosilicon compound having hydrolyzable groups or a partial hydrolyzate thereof in the presence of (C) a condensation catalyst. Use is made of a vibratory mixer comprising a conduit through which a fluid flows in an axial direction and an agitating element disposed in the conduit for reciprocal motion in the flow direction. A reactant mixture of necessary components is introduced into the conduit where the components are vibro-agitated by the agitating element while reaction takes place.

Abstract: An antimicrobial drug having excellent antimicrobial activity and high safety is disclosed, which comprises as an active ingredient, a quinolone derivative having a substituted aminocycloalkylpyrrolidine as a substituent and which is further substituted with various substituents, represented by formula (I), its salts and hydrates thereof: wherein Q is represented by formula (II) or (IV).

Abstract: An ultrasonic treating tool comprises a gripping section incorporating an ultrasonic vibration element for generating an ultrasonic vibration, a vibration transmitting section for transmitting a vibration from the ultrasonic vibration element to a distal end, a clamping member opened and closed relative to the probe, and a handle provided at the gripping section to open and close the clamping member, in which a force applying point of the handle is displaced more on a proximal end side than at a swing center of the handle and the acting direction of a force application point is toward and away from the gripping section.

Abstract: A reflecting-type optical system according to the invention includes an optical element composed of a transparent body having an entrance surface, an exit surface and at least three curved reflecting surfaces of internal reflection. A light beam coming from an object and entering at the entrance surface is reflected from at least one of the reflecting surfaces to form a primary image within the optical element and is, then, made to exit from the exit surface through the remaining reflecting surfaces to form an object image on a predetermined plane, In the optical system, 70% or more of the length of a reference axis in the optical element lies in one plane.

Abstract: A zoom optical system and an image pickup apparatus using the same are disclosed. The zoom optical system comprises a first optical unit having a refractive power, the first optical unit having a reflecting surface, a second optical unit having a refractive power, and a driving portion for moving a light receiving surface which receives light from an object through the first optical unit and the second optical unit. The zoom optical system performs variation of magnification by moving at least one of the first optical unit and the second optical unit, and a deviation of a focus position due to the variation of magnification is corrected by the light receiving surface being moved by the driving portion.

Abstract: At the time of casting a structural material for a casing, metal pipes to be used as passages to and from a tilt actuator of a swash plate are integrally embedded in a cast body of the structural material. In a casting stage of the structural material for the casing, metal pipes are set in position within a casting mold, and then molten metallic material is introduced into the mold. A main casing for a hydraulic motor is formed out of the cast structural material by finishing its inner and outer peripheral surfaces and outer ends of embedded metal pipes. The resulting casing has the metal pipe conduits embedded in its cylindrical body portion from its open end toward its bottom portion with cylinders for a tilt actuator, the embedded metal pipe conduits providing passages on the inner peripheral side for supplying and discharging tilt control hydraulic fluid to and from the tilt actuator.

Abstract: An antimicrobial drug having excellent antimicrobial activity and high safety is disclosed, which comprises as an active ingredient, a quinolone-derivative having a substituted aminocycloalkylpyrrolidine as a substituent and which is further substituted with various substituents, represented by formula (I), its salts and hydrates thereof: ##STR1## wherein Q is represented by formula (II) or (IV). ##STR2## Also disclosed is a quinolone derivative where R.sup.

Abstract: There is disclosed an optical system adapted for use in an image taking device. The optical system comprises an optical element having an entrance surface, a curved internal reflective surface and an exit surface on the surface of a transparent member composed for example glass, in which the light beam from an object is refracted at the entrance surface, thus being incident on the interior of the optical element, then is internally reflected by the reflective surface and refracted at the exit surface, thus emerging from the optical element and focusing on an imaging plane. The internal reflective surface is an off-axis reflective surface, and the entrance surface, the internal reflective surface or surfaces and the exit surface are so designed as to cancel the chromatic aberration generated at the refractive surfaces, while satisfactorily correcting other optical aberrations.

Abstract: A treating instrument for an operation includes an elastic ring for reducing a load on an operator's fingers which contact first and second rings of first and second handle elements. The elastic ring is provided on a section of at least one of the first and second rings which contacts the operator's fingers.

Abstract: An electromagnetic wave absorption panel for use in building construction includes a protective tile layer, an absorber layer, a metal reflective layer, and a building support layer, such as concrete. The absorber layer is multi-component structure, such as: a high dielectric constant layer and ferrite layer; a ferrite layer and a low dielectric constant layer; a ferrite and a polymer; a polymer and a material having a higher dielectric constant than the polymer; a ferroelectric, a ferrite, and a polymer; a ferrite, a polymer, and a high dielectric constant material; and a high dielectric constant material, a material in which the imaginary part of the permeability is greater than or equal to the real part of the permeability, and a low dielectric constant material. The invention also includes combinations of the above, such as: a high dielectric constant material, a ferrite, and a low dielectric constant material; and multiple layers of a ferrite and a polymer.

Abstract: The invention effectively prevents occurrence of corrosion in water tubes or the like of boilers. The invention provides a method for operating a boiler, including regulating a concentration of sulfate ions SO.sub.4.sup.2- in boiler water to under 500 ppm, and a method for injecting a sulfite base oxygen scavenger, including setting a concentration of residual dissolved oxygen in boiler feed water to 2-4 ppm. The invention further provides a sulfite base oxygen scavenger composition comprising: 3-30 weight % of at least one selected from a group consisting of Na.sub.2 SO.sub.3, K.sub.2 SO.sub.3, NaHSO.sub.3 and KHSO.sub.3 ; 1-20 weight % of NaOH or KOH; 0.2-2 weight % of potassium sorbate; and 5-500 ppm of CoSO.sub.4.

Abstract: A zoom lens comprises a plurality of optical elements each of which includes a transparent body having two refracting surfaces and a plurality of reflecting surfaces and is arranged so that a light beam enters the transparent body from one of the two refracting surfaces, repeatedly undergoes reflection, and exits from the other of the two refracting surfaces, and/or a plurality of optical elements on each of which a plurality of reflecting surfaces made from front surface mirrors are integrally formed, and each of which is arranged so that an entering light beam repeatedly undergoes reflection by the plurality of reflecting surfaces and exits from the optical element.

Abstract: A liquid silicone rubber base including (A) an alkenyl-containing organopolysiloxane, (B) a reinforcing silica filler, (C) a mixing assistant in the form of a silanol-containing compound, (E) an organohydrogen polysiloxane, (f) a platinum catalyst and optionally, (D) a wetting auxiliary catalyst is prepared by previously mixing 10-120 parts of component (A) with 1-35 parts of component (C) and 0-35 parts of component (D) to form a premix liquid, mixing the premix liquid with 100 parts of component (B) to form a premix power, and kneading the premix powder with the remainder of component (A). By adding a curing agent of organohydrogenpolysiloxane/platinum catalyst to the liquid silicone rubber base, there is obtained a liquid silicone rubber composition having improved fatigue endurance.

Abstract: A liquid silicone rubber base is prepared by mixing an organopolysiloxane containing at least two alkenyl groups, reinforcing silica having a BET specific surface area of at least 50 m.sup.2 /g, and optionally, a mixing assistant. The mixing step includes a first stage of mixing under a first shear stress of at least 1.times.10.sup.6 N/m.sup.2 for 1-5 minutes and a second stage of mixing under a second shear stress which is up to 1/2 of the first shear stress for at least 2 minutes. The silicone rubber base is sufficiently shelf stable to minimize a viscosity rise with time.

Abstract: An electromagnetic wave absorption panel for use in building construction includes a protective tile layer, an absorber layer, a metal reflective layer, and a building support layer, such as concrete. The absorber layer utilizes novel materials including high dielectric constant materials, such as ABO.sub.3 type perovskites, layered superlattice materials, conducting oxides, and signet magnetics, ferroelectrics, such as ABO.sub.3 type perovskites and layered superlattice materials, garnets, a nickel-zinc ferrite, Ni.sub.0.4 Zn.sub.0.6 Fe.sub.2 O.sub.4, and polymer-ceramic composites of the above materials.

Abstract: This invention relates to a N.sub.1 -(halogenocyclopropyl)-substituted pyridonecarboxylic acid derivative represented by the following formula (I): ##STR1## wherein X.sup.1 is a halogen atom or a hydrogen atom; X.sup.2 is a halogen atom; R.sup.1 is a hydrogen atom, a hydroxyl group, a thiol group, a halogenomethyl group, an amino group, an alkyl group or an alkoxy group which may have a substituent group; R.sup.2 is a group represented by the following formula (II): ##STR2## wherein R.sup.3 and R.sup.4 are independently a hydrogen atom or an alkyl group and n is an integer of 1 or 2; A is a nitrogen atom or a partial structure of the following formula (III): ##STR3## wherein X.sup.

Abstract: A medical instrument for use in combination with an endoscope having an operating shaft and a pair of tongs. The instrument has a drive mechanism provided between the operating shaft and the tongs, for opening and closing the tongs. The drive mechanism can apply an additional force to the tongs even after the tongs have closed completely.