PURPOSE:To measure the density of impurities by utilizing the fact that the ratio in strength of luminescence rays radiated both from substrate crystals and epitaxial crystals when laser beams are applied to the epitaxial silicon crystals on a silicon crystal substrate has a definite relation with the density of impurities of the epitaxial crystals. CONSTITUTION:A sample prepared by making epitaxi...

Thermoplastic synthetic resin foam articles are described which, in accordance with machine production, are elongated principally in the longitudinal direction and have a cross sectional dimension of at least 6.35 mm and a cross sectional area of at least 51.6 cm<2>, where the cells have a mean cell size in the range from 0.1 to 1.2 mm. These cells contain at least one low-permeability halogenated...

A dielectric film with improved dielectric strength, mechanical strength, high temperature utility, and moisture resistance is described comprising the reaction product of 1, 2, 3, 4 butane tetracarboxylic acid, a multifunctional amine of the formula: and at least one diamine, the multifunctional amine constituting at least 5% of the total amine equivalents of the reactants. The polyimide...

1526482 Vulcanizing liquid diene polymers MICHELIN ET CIE 29 Jan 1976 [30 Jan 1975] 03578/76 Heading C3P Liquid diene prepolymers having a degree of functionality of 1À8-2À0 are vulcanized by (1) forming a mixture thereof with reinforcing filler, a sulphur vulcanization agent and a difunctional chain extender compound in amount such that the ratio of functional groups on the polymer to those on th...

Expandable styrene polymer particles which have fast cooling rates during molding are produced by dry blending styrene polymer particles in the presence of 0.05 to 0.4 parts of silicone surfactant per 100 parts of polymer particles. The silicone surfactant is selected from the siloxane-oxyalkylene copolymers having at least one polysiloxane block which contains mers of the general formula R2SiO, w...

Expandable styrene polymer particles are surface-coated with calcium polysilicate to prevent the particles from lumping together during expansion. The coating is applied by adding 0.02-0.05 part of calcium polysilicate to an aqueous suspension containing 100 parts of polymer particles subsequent to impregnating the mixture with a blowing agent, or by dry-blending polymer particles with the polysil...

A process for initiating and controlling the regeneration of spent fluid catalytic cracking catalyst containing catalytically effective amounts of a C0 conversion promotor and for the essentially complete catalytic conversion of C0 to C02 both in a dense bed of catalyst maintained in an FCC regeneration zone. The process comprises (a) passing to a dense-phase catalyst bed in a regeneration zone sa...

New 1,1,2-triphenylpropane and -propene derivatives of the general formula (I), wherein A and B each stand for hydrogen or they form together a valence bond, X and Y are identical or different and stand for phenyl group or a phenyl group having a halogen, hydroxy methoxymethoxy, C1-6 alkoxy or benzyloxy substituent in the para position, R1 is a C1-6 alkyl, epoxyalkyl, azidoalkyl, methox...

A process for producing an improved ceramic fiber molding by submersing the molding into a suspension containing colloidal silica and/or colloidal alumina and chromium oxide powder. The chromium oxide is deposited onto the ceramic fibers thereby increasing the molding's resistance to linear shrinkage and corrosion when subjected to high temperatures.

Method of making a self-locking internally threaded article such as a nut including a locking body or patch of normally hard, tough, resilient thermoplastic resin adhered to the threaded surface. The article is mounted on a support with the openings at the ends substantially free. A heater raises the temperature of the threaded portion to above the softening point of the resin and a powder jet and...

A flexible joint for deep-sea oil installations. This joint combines the two parts of a swivel joint, consisting of a spherical ring-shaped male adapter and a spherical ring-shaped female adapter, by using means of connection comprising a plurality of identical resilient devices, positioned in even numbers in two crowns, the far ends of these devices resting on two ring-shaped end-plates, the uppe...

A method of producing laminar structures, preferably consisting of fibreglass-reinforced polyester, which are free of air-pockets and pores, by spraying layers of the plastics and reinforcement fibres at a partial vacuum. The method may be carried out by an industrial robot. An airtight surface layer may be sprayed onto the laminate, whereby any pores or air-pockets collapse when the laminate is e...

A method and apparatus are provided for handling heat-softenable batch material. The batch components are mixed together and then mixed with liquid and formed into pellets of substantially uniform size and shape. The pellets are preheated in a heat-exchange chamber through which hot gases are passed from a melting unit to which the preheated pellets are supplied, saving considerably on energy r...

An agent for accelerating hardening of cement for use in an underground mining installation employing concrete-like packs including run-of-mine coal. The agent comprises by weight one and a half parts triethanolamine, five parts sodium carbonate and one part potassium carbonate. Too rapid setting of quick setting cement is avoided by the agent because a slurry of cement in water is mixed with a sl...

1502537 2 - Desoxy - streptamine derivatives ROUSSEL-UCLAF 23 July 1976 [23 July 1975] 30746/76 Heading C2C Novel N 1 - [L(-) - 2 - hydroxy - 4 - aminobutyryl] - 4 - O - [21,61 - diamino - 21,61 - didesoxy - α,D - glucopyranosyl] - 6 - O - [311- methylamino - 311,411,611 - tridesoxy - α,D- xylohexopyranosyl] - 2 - desoxystrep...

Derivatives of d-2-(6-methoxy-2-naphtyl)-propionic acid with therapeutical activity having general formula: wherein X is selected in the group comprising H, and a radical selected among the radicals of organic or inorganic, non toxic and pharmaceutically acceptable bases, the radicals of basis aminoacids and the radicals of basic antibiotics. The invention relates also to the process for ob...

The invention relates to alpha -hydroxyalkyl-3,4,5-trihydroxypiperidines defined by Formula (I), infra, and pharmaceutical compositions and medicaments containing said compounds. Also included in the invention are methods for the use of said compounds, compositions and medicaments as inhibitors of alpha -glucoside hydrolases; and intermediates for the compounds of said Formula (I).

Immunologic adjuvants are obtained by the synthesis of 6-(5-cholesten-3 beta -yloxy)hexyl 6-amino-6-deoxy-1-thio- beta -D-galactopyranoside and its 6-deoxy-6-oleamido derivative.