A semiconductor harmonic generating device comprising a nonlinear medium and a waveguide which is provided in the upper face of the nonlinear medium. A higher harmonic laser light from a fundamental wave laser light which passes through the waveguide, wherein the waveguide has refractive index dispersion means for counterbalancing the refractive index difference caused by wavelength dispersion, occurring in the nonlinear medium, between the fundamental wave laser light and the higher harmonic la...

A higher harmonic wave generator, comprising: (1) a first optical waveguide made of a nonlinear optical material, having a structure which can guide the incident fundamental wave; and (2) a second optical waveguide made of nonlinear optical material, connected to the first optical wave guide optically, having a structure which can guide a higher harmonic wave of the fundamental wave; wherein the effective refractive index of the first optical waveguide is made to be equal to the effective refrac...

Methane is converted into higher hydrocarbons by contact at a temperature in the range from 500.degree. to 1000.degree. C. with a contact solid comprising a manganese oxide incorporating at least one of the elements tin, titanium, tungsten, tautalum, silicon, germanium, lead, phosphorus, arsenic, antimony, boron, gallium, indium, a lanthanide or an actinide. The contact solid is preferably promoted by either an alkali or alkaline earth metal, for example sodium.

A mounting arrangement for a handset, neckset and the like having a transmit and a receive end. A regular-shaped cavity is provided at the transmit end for receiving a higher order microphone capsule, having two or more poles. The capsule is symmetrically fixed with the geometrical center substantially corresponding with the geometrical center of the cavity. The transversal size of the capsule is less or equal to the depth of the cavity. In this way, the capsule is embedded into the cavity, and ...

A microchannel plate with a plurality of microchannel portions, a portion in an amplifying direction from another portion having a lower surface zone resistance than the other, materials and circuitry being provided to permit controlled higher-temperature operation.

The higher chloroalkanes, advantageously the higher chloromethanes, are continuously produced from at least one lesser chloroalkane, by (i) continuously introducing chlorine and said at least one lesser chloroalkane into a stream of reaction medium continuously and essentially autogenously recirculating in a loop circuit which comprises an essentially vertical principal reaction zone, (ii) continuously chlorinating said at least one lesser chloroalkane in said essentially vertical principal reac...

A process of producing higher ketones comprises the step of contacting under suitable conditions a feed comprising (a) at least one C.sub.3 -C.sub.6 aliphatic ketone, (b) at least one C.sub.2 -C.sub.6 aliphatic aldehyde and, preferably, also (c) carbon monoxide with a catalyst composition comprising (i) copper or an oxide thereof and (ii) zinc oxide. Preferably, the feed ketone is methyl ethyl ketone, the feed aldehyde is propanal, and the product comprises at least one C.sub.7 ketone.

This invention involves increasing the yield in the production of silicon or silicon alloys in melting furnaces by admixing the effluent dust with an alkali metal hydroxide and reintroducing the admixture into the melting furnace.

An isoparaffin, e.g., isobutane and/or isopentane are alkylated with ethylene in presence of a higher olefin, e.g., propylene, a butylene, etc., using hydrogen fluoride catalyst to produce high octane value alkylate with little or no or some formation of ethyl fluoride. Alkylate of 97 plus, TEL-free, Research Octane can be produced from isobutane, propylene and ethylene. Alkylate of one hundred Research Octane with no tetraethyl lead can be produced with approximately equal parts by weight of et...

A process to obtain liquid and gaseous hydrocarbon products from low grade carbonaceous deposits such as lignite, by retorting a first portion to produce a hydrocarbon oil, and reacting a second portion with the oil, thus producing increased fuel oils and gases.