Abstract: There are provided pregnane derivatives represented by formula ##STR1## wherein A.sup.1 represents a hydrogen atom or a hydroxyl group, A.sup.2 represents a substituent such as a hydroxyl group when A.sup.1 represents a hydrogen atom, or A.sup.2 represents a hydrogen atom when A.sup.1 represents a hydroxyl group, or A.sup.1 and A.sup.2 are combined together to form an oxo group; D.sup.1 represents a substitutent such as a hydroxyl group, and D.sup.2 represents a hydrogen atom, or D.sup.1 and D.sup.2 are combined together to form an epoxy group or a single bond; D.sup.3, D.sup.5 and D.sup.7 each represents a hydrogen atom, D.sup.4 represents a hydroxyl group, and D.sup.6 represents a substitutent such as a hydroxyl group, or D.sup.3 and D.sup.4 may be combined together to form an epoxy group or a single bond, or D.sup.4 and D.sup.5 may be combined together to form a single bond, or D.sup.5 and D.sup.6 may be combined together to form an epoxy group or a single bond, or D.sup.6 and D.sup.

Abstract: A traction type transmission characterized in that a planetary roller mechanism is constituted by a sun roller, a plurality of planetary rollers disposed equidistantly around the sun roller and an exterior ring disposed outside the planetary rollers, the sun roller is connected to a high speed shaft while either the exterior ring or the planetary shafts of the planetary rollers are connected to a low speed shaft through a rotary member; the planetary rollers are strongly pressed to the outer periphery of the sun roller in the presence of an oil and two slope surfaces of the inner periphery of the exterior ring are strongly pressed to both shoulder portions of the outer periphery of these planetary rollers in the presence of an oil, respectively.

Abstract: A controlling transmission comprising a planetary gear mechanism in which at least one pair of intermediate gears are interposed to mesh with a sun gear and an internal gear and in which intermediate shafts respectively supporting the intermediate gears are fixed on a carrier. The indexing positions for fixing the intermediate shafts on the carrier are set such that a tooth surface contacting state, in which one of the intermediate gears meshes with the sun gear and the internal gear, and another tooth surface contacting state, in which the other of the intermediate gears meshes with the sun gear and the internal gear, are determined to have opposite power transmitting directions.

Abstract: Disclosed herein is a polypropylene sheet obtained by forming a resin composition, which contains a polypropylene resin and a hydrogenated petroleum resin in specific amounts, into a sheet at a particular chill-roll temperature and then annealing the sheet at a specific temperature for a specific period of time as well as an improved production process of such a polypropylene sheet. Also disclosed is a polypropylene sheet comprising a sheet obtained from the above resin composition and a polypropylene layer of at least 10 .mu.m thick applied on at least one side of the sheet. A polypropylene resin composition suitable for the production of such polypropylene sheets is also disclosed. The above polypropylene sheets are suitable for use in press-through packages.

Abstract: When a portion of the Pb of a Pb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 -based ceramic composition within the region bounded by lines connecting a, b, c and d points in the ternary composition diagram of the accompanying FIG. 1 is substituted by a small amount of Ba and/or Sr, a high dielectric constant type ceramic composition which has a small temperature coefficient of dielectric constant and which is effective as a material for multilayer ceramic capacitors is obtained.

Abstract: A transmission for controlled equipment consists of a pair of intermediate gears in mesh with an input gear, another pair of intermediate gears in mesh with an output shaft and a pair of intermediate shafts, each connecting one of the intermediate gears engaged with the input gear and one of the intermediate gears engaged with the output gear, thus forming a pair of gear trains, wherein one of the intermediate gears is loosely mounted on one of the intermediate shafts and is also made fixable by a fixing means, the intermediate shaft and the intermediate gear in the loosely coupled condition are slightly turned in opposite directions so that the gear train made up of the input gear, the intermediate gears on one side and the output gear and the other gear train made up of the input gear, the intermediate gears on the other side and the output gear have no backlash between the gear teeth surfaces of the input gear and the intermediate gears with respect to the power driving directions which are opposite for th

Abstract: Herein disclosed is a controlling transmission to be used with an industrial robot or the like, which is constructed of a planetary or star gear mechanism having at least one pair of intermediate gears arranged between a sun gear and an internal gear. The paired intermediate gears are set by the movement adjustment of a movement adjusting mechanism such that one of them has its back-lash eliminated with respect to the rotations in the clockwise direction whereas the other has its back-lash eliminated with respect to the rotations in the counter-clockwise direction.

Abstract: Disclosed are a compound of Formula I: ##STR1## wherein R.sub.1 represents a hydrogen atom or a protective group for a hydroxyl group; and Z represents a direct bond (2,3-cis-5R*, 8S*) or an oxygen atom which forms an oxirane ring having a configuration of (2R*, 3R*, 5R*, 8S*),and a process for preparing the same.By use of the above compound as an intermediate, there can be synthesized periplanone-B which is a sex pheromone of periplaneta.

Abstract: A method is disclosed which manufactures a recording head adapted to be moved relative to a recording medium, which is comprised of a conductive substrate and dielectric layer formed on the conductive substrate, to permit data to be recorded on the recording medium with the use of a conductive/magnetic toner on the recording medium. A conductive/magnetic sheet is attached to an insulating substrate of a first size with an adhesive layer therebetween, the first size of the insulating substrate is greater than a second size thereof defined by an insulating substrate of a finally completed recording head. The conductive/magnetic sheet is selectively etched to form an array of slits at a predetermined interval with both ends of the slits located beyond the side edges of an insulating substrate of a finally completed recording head. At one side edge portion of the conductive/magnetic sheet the conductive/magnetic sheet is electroplated to form a plated layer for a bonding pad.

Abstract: A vaccine for preventing or at least inhibiting periodontitis of humans and animals, which is induced or deteriorated by the action of oral microorganisms, which comprises an antigen isolated from the pili of an oral microorganism capable of inducing and/or deteriorating periodontitis and having the pili on the cell surface. For example, antigens isolated from the pili of Actinomyces viscosus, Actinomyces naeslundii, Actinobacillus actinomycem comitans, Bacteroides gingivalus and mutant strains thereof may be used solely or in combination for the preparation of the present vaccine. In one embodiment, the vaccine comprises an antigen isolated from the pili of Actinomyces viscosus which is a representative periodontitis-inducing oral microorganisms in association with one or more other antigens isolated from other virulent oral microorganisms.

Abstract: An apparatus for changing rotational speed with the aid of clutching activity comprises a planetary gearing mechanism disposed between an input shaft and an output shaft in a housing with an inner ring gear being rotatably supported therein, ring-shaped braking plates comprising an opposing pair of frictional plates, one of them being located on the outer periphery of the inner ring gear to rotate together with the latter and the other one being axially displaceably fitted into the inner periphery of the casing, the first mentioned frictional plate being located opposite to the last mentioned frictional plate, and a ring-shaped bellows located opposite to the last mentioned frictional plate to expand in the axial direction when pressurized fluid is filled therein and contract in the axial direction when it is discharged therefrom.

Abstract: An auto-tracking method and apparatus of a helical scan type magnetic recording/reproducing apparatus wherein envelope levels of reproduced signals are detected and the running phase of a magnetic tape is controlled so that the envelope level of the reproduced signal becomes maximum after detection is effected roughly and then finely, thereby allowing a video head to scan a track on the magnetic tape.

Abstract: A method of shaft power generation includes: a step of dividing mechanical power taken out from a main engine into two portions for respective systems; a step of inputting one of the portions of the divided mechanical power directly to a differential planetary gear mechanism; a step of inputting the other portion of the divided mechanical power to the differential planetary gear mechanism through a subsidiary generator, a thyristor or transistor controller and a thyristorized or transistorized motor, each of which has a capacity which is equal to a value obtained by adding a slight allowance to a value obtained by multiplying the capacity of a main generator by the ratio between, on the one hand, a value obtained by the difference between the lowest and highest number of revolutions of the main engine of the range within which the mechanical power therefrom is employed for power generation and, on the other hand, the highest number of revolutions, thereby combining into one the two portions of the divided mec

Abstract: There is disclosed a high dielectric constant material which comprises a composite material comprising at least one of BaO and CaO; PbO; Fe.sub.2 O.sub.3 ; Nb.sub.2 O.sub.5 ; WO.sub.3 and CuO, said composite material being represented by the general formula:xPb(Fe.sub.1/2 Nb.sub.1/2 l )O.sub.3 -yM(Cu.sub.1/2 W.sub.1/2 )O.sub.3 -zPb(Fe.sub.2/3 W.sub.1/3 )O.sub.3wherein M is at least one of Ba and Ca, and x, y and z are defined in the specification.The disclosed dielectric material can also contain 0 to 1.0% by weight, relative to said composite material, of manganese oxide.

Abstract: A metal oxide varistor is disclosed which a component of grain bodies comprised of zinc oxide and a component of grain boundary layers comprised of another metallic oxide, containing metal other than zinc wherein at least a portion of these starting materials comprised a fine particle powder prepared by a co-precipitatin method.The metal oxide varistor of the present invention is excellent in varistor characteristics such as non-linearity to voltage, life performances and capability of energy dissipation, is small in a scatter of the above characteristics between manufacture lots or within each lot at the time of manufacture, and has a good quality stability. Unexpected results are obtained when the co-precipitated fine particles are subjected to a refrigeration-dehydration type process.

Abstract: A varistor having good voltage-current nonlinear characteristics and a long life performance. The varistor is formed of a sintered body consisting essentially of zinc oxide as a major component, 0.1 to 5 mol % of bismuth in terms of Bi.sub.2 O.sub.3, 0.1 to 5 mol % of cobalt in terms of Co.sub.2 O.sub.3, 0.1 to 5 mol % of manganese in terms of MnO, 0.1 to 5 mol % of antimony in terms of Sb.sub.2 O.sub.3, 0.1 to 5 mol % of nickel in terms of NiO, and 0.001 to 0.05 mol % of aluminum in terms of Al.sup.3+.

Abstract: A varistor comprising a basic component consisting essentially of ZnO as a principal constituent and, as auxiliary components, bismuth (Bi), cobalt (Co), manganese (Mn), antimony (Sb) and nickel (Ni) in an amount, when calculated in terms of Bi.sub.2 O.sub.3, Co.sub.2 O.sub.3, MnO, Sb.sub.2 O.sub.3 and NiO, respectively, of Bi.sub.2 O.sub.3 : 0.1 to 5 mol %, Co.sub.2 O.sub.3 : 0.1 to 5 mol %, MnO: 0.1 to 5 mol %, Sb.sup.2 O.sub.3 : 0.1 to 5 mol % and NiO: 0.1 to 5 mol %; and an additional constituent comprising boron (B) in an amount, when calculated in terms of B.sub.2 O.sub.3, of 0.001 to 1 wt % based on said basic component, the Bi.sub.2 O.sub.3 of the sintered body comprising not less than 30% of .alpha.-phase . In another embodiment, the above basic component may further comprise at least one of Al, In and Ga in a prescribed amount and the above additional component may be (i) B with or without at least one of Ag and Si in a prescribed amount or (ii) a glass containing B in a prescribed amount.

Abstract: Disclosed is a metal oxide varistor which comprises; a sintered body containing (a) ZnO as a principal component, and (b), as auxiliary components, Bi, Co and Mn in amounts of 0.05.about.2 mole %, 0.05.about.2 mole % and 0.05.about.2 mole %, when calculated in terms of Bi.sub.2 O.sub.3, Co.sub.2 O.sub.3 and MnO.sub.2, respectively, and at least one selected from Al, In and Ga in amounts of 1.times.10.sup.-4 .about.3.times.10.sup.-2 mole %, when calculated in terms of Al.sub.2 O.sub.3, In.sub.2 O.sub.3 and Ga.sub.2 O.sub.3, respectively; said sintered material having been reheated at a temperature of 650.degree..about.900.degree. C. after sintering; and a non-diffusible electrode provided on said sintered body. The metal oxide varistor has excellent pulse response and volt-ampere non-linearity even with respect to a pulse having a short rise time of less than a microsecond.

Abstract: A number of identical articles, for example, coiled filaments for electric lamps are retained by a shutter member at a starting station. When the article is not present in a hopper station which is arranged at an intermittent feeding mechanism of an article assembling station and which temporarily retains the article, the shutter member is opened so as to feed the article from the starting station to the hopper station through two chutes which are slanted at different angles. The article is fed to the intermittent feeding mechanism of the article assembling mechanism from the hopper station at the operating timing of the intermittent feeding mechanism.

Abstract: A gas detecting element comprising a hollow cylindrical insulative body, a pair of electrodes provided on the outer periphery of the insulative body, a gas detecting body covering up the outer periphery of the insulative body and the electrodes, a catalyst layer made of a catalytic material and coated on said gas detecting body, thereby covering up the surface of said gas detecting body, and a heater disposed in the hollow of the insulative body. When the gas detecting element comes into contact with a gas, the surface resistance of the gas detecting body varies, thereby detecting the gas.