Abstract: A method for the production of methacrylic acid comprising the steps of simultaneously introducing at least one compound selected from the group consisting of methacrolein and isobutyl aldehyde and a molecular oxygen-containing gas into a heat exchanger type shell-and-tube reaction vessel packed with an oxide catalyst containing molybdenum and phosphorus thereby effecting catalytic vapor-phase oxidation reaction and/or catalytic vapor-phase oxidative dehydrogenation reaction and consequently forming methacrylic acid, which method is characterized by having the empty space in the gas outlet part of said reaction vessel with a solid filler.

Abstract: In a position detecting method and an apparatus therefor, a signal processing circuit including a semiconductor laser, a light receiving element and the like is arranged on the outside of a servomotor. An article to be detected is arranged within the servomotor. The signal processing circuit and the article are connected to each other by a single or a plurality of optical fibers. A laser light is applied to surface properties formed inevitably at processing of a surface of the article, to produce a signal of a reflected light. The signal of the reflected light and a beforehand stored position signal of the article are compared with each other so as to be converted into a rotational-angle signal, thereby detecting a position of the article.

Abstract: A process for producing methacrylic acid, which comprisesfilling a plurality of catalysts of different activities into a plurality of reaction zones which have been formed in each of the reaction tubes of a fixed bed multi-tubular reactor by dividing said reaction tube into two or more portions in the direction of tubular axis, so that the activity of catalyst is higher as the reaction zone is closer to the outlet of the reaction tube, andintroducing into the reaction zones containing the catalysts at least one compound selected from methacrolein, isobutyl aldehyde and isobutyric acid to oxidize the at least one compound with molecular oxygen or a molecular oxygen-containing gas.

Abstract: A process for producing an unsaturated aldehyde or an unsaturated acid comprises catalytically oxidizing propylene or at least one compound selected from isobutylene, tert.-butyl alcohol and methyl-tert.-butyl ether in a gaseous phase with molecular oxygen or a molecular oxygen-containing gas using a fixed bed multipipe reactor, wherein(a) a plurality of composite oxides, different in occupied volume, are used as catalyst,(b) a plurality of reaction zones are provided along an axial direction in each reaction pipe of the fixed bed multipipe reactor, and(c) the plurality of the catalysts different in occupied volume are filled in the plurality of the reaction zones such that the occupied volumes become lower from the starting gas inlet side to the outlet side.

Abstract: A catalyst for the production of methacrylic acid composed of an inert carrier and a catalytically active substance. The catalytically active substance layer being composed of oxides represented by the following formula (I)Mo.sub.a P.sub.b a.sub.c B.sub.d C.sub.e D.sub.f O.sub.x (I)where Mo represents molybdenum, P represents phosphorus, A represents at least one element selected from arsenic, antimony, germanium, bismuth, zirconium, cerium and selenium, B is at least one element selected from copper, iron, chromium, nickel, maganese, cobalt, tin, silver, zinc, palladium, rhodium and tellurium, C represents at least one element selected from vanadium, tungsten and niobium, D represents at least one element selected from alkali metals, alkaline earth metals and thallium, and O represents oxygen, a, b, c, d, e, f and x respectively represent the atomic ratios of Mo, P, A, B, C, D and O, and when a=12, b=0.5-4, c=0-5, d=0-3, e=0-4, and f=0.

Abstract: A rotary machine having a stator assembly constructed by joining brackets to a stator core by all-round laser welding without entailing the thermal deformation of those components. The omission of through-bolts for fastening together the stator core and the brackets and the resultant omission of through holes in the stator core for receiving the through-bolts reduces the outside dimensions of the laminations of the stator core. Superfluous spaces in the stator assembly are filled with a resin to prevent the condensation of moisture attributable to temperature variation within the rotating machine, to provide the rotating machine with a high rigidity, to suppress vibrations and to enhance heat transfer from the stator coils to the brackets.

Abstract: In a static RAM having an internal low voltage transformation circuit, a word line drive circuit is provided which applies a low voltage, from an internal low voltage transformation circuit to a word line during read-out to improve the static RAM operating margin. The internal low voltage transformation circuit is formed by a reference voltage supply circuit and an internal voltage control circuit. A data hold voltage is supplied, when the static RAM is operating at a lower voltage, by a power pull-down device having a lower power consumption than the internal low voltage transformation circuit so as to achieve power consumption savings.

Abstract: This invention relates to a improved method for the production of methacrylic acid by the steps of subjecting isobutylene and/or tertiory hutanol to catalytic vapor-phase oxidation with molecular oxygen in a first reactor, then supplying the resultant gax mixture to a second reactor, a rodlike or plate like insert set being placed in the empty space of gas inlet part of the tube of said second reactor.

Abstract: A catalyst used for producing, by catalytic gas phase oxidation of a C.sub.3 -C.sub.5 oelfin or tertiary alcohol, the corresponding unsaturated aldehyde and unsaturated carboxylic acid, said catalyst characterized by comprising molybdenum, iron and bismuth and having a specific surface area in the range from 1 to 20 m.sup.2 /gr, a pore volume in the range from 0.1 to 1.0 cc/gr and a pore diameter distribution in which the pore diameters are collectively distributed in the range of each of from 1 to 10 microns and from 0.1 to less than 1 micron; and a process for preparing said catalyst by charging an unfired material power into a centrifugal flow coating device to form particles having the average particle diameter of 2 to 10 mm and then firing the particles.

Abstract: A catalyst for purifying exhaust and waste gases, which consists essentially of(A) 30 to 99% by weight of at least one catalytic oxide selected from a binary oxide comprising titanium and silicon and a ternary oxide comprising Ti, Zr and Si,(B) 1 to 70% by weight of a catalytic oxide comprising at least one element selected from the group consisting of V, W, Mo, U, Cu, Fe, Cr, Mn and Ce, and(C) 0 to 50% by weight of a catalytic oxide comprising at least one element selected from the group consisting of Sn, Zn, Pb, Ti, Zr, Ni, Co, Nb, Ta, P, Br, Bi, Sb, alkali metals, and alkaline earth metals.

Abstract: Compounds of the formula ##STR1## wherein R represents CN, SCH.sub.3, Cl, Br or CF.sub.3 and n represents 0 or 1, have very excellent acaricidal activity.

Abstract: A catalyst for purifying exhaust and waste gases comprisingA. a support substrate comprising 2 to 100% by weight of an oxide complex of titanium and phosphorus containing titanium and phosphrus in such a proportion that the molar ratio of TiO.sub.2 to P.sub.2 O.sub.5 is from 5.0 to 0.5 and 98 to 0% by weight of aluminum oxide, andB. supported on said substrate as a catalytic substance, 2 to 300 parts by weight, calculated as metal oxide per 100 parts by weight of the support substrate (A), of at least one heavy metal selected from the group consisting of Ni, Cu, Cr, Fe, Co, Mn, Bi, V, W, Mo, Sn, Zn, Zr, Pb, Sb, Ti, Ta, Cd and Nb, or 0.01 to 1.0 part by weight, calculated as metal per 100 parts by weight of the support substrate (A), of at least one noble metal selected from the group consisting of Pt, Pd, Rh, Ir, Os and Ru.

Abstract: A new compound of the formula ##STR1## wherein X represents methyl group or chlorine atom, Y represents a lower alkyl group having from 1 to 6 carbon atoms or allyl group, R represents propargyl group or an alkenyl group having from 3 to 18 carbon atoms, which may be substituted by chlorine atom and n represents 0, 1 or 2 is used for combating acarids.

Abstract: Pipe coupling usable for piping in pneumatic conditioning systems which has male and female assemblies each given in the form of a single united or single body and each provided with a valve assembly which can be incorporated into the associated assembly from the front side opening and set in prescribed position and posture without need for the conventionally employed swaging operations, and a valve closure body incorporated in the male assembly whose both fringes encroach upon corresponding surfaces formed on the male and female assemblies, respectively, in order to assure simplified preparation of the male and female assemblies, enhanced reliable fluid sealing effect even after a long use and release of assembly plants from the problem of chemical pollution of the environment.