摘要:
Semiconductor devices are prepared by growth of epitaxial layers on a substrate from metalorganic compounds of the formula MR.sub.3, R being an alkyl group, or its amine adduct. The metalorganic compound was prepared by reacting a Grignard reagent with a metal halide in an amine solvent.
摘要:
A process is provided for the production of metalorganic compounds by reacting a Grignard reagent with a Group II, Group III or Group V metal halide in a tertiary alkyl amine solvent to form a metalorganic adduct, isolating the adduct and dissociating the adduct to leave the metalorganic compound.
摘要:
A trolley, comprising a retractable wheel assembly (31, 32) movable between stored and in-use positions. The wheel assembly comprising an assembly support; at least one wheel arm (35) operably-connected to a wheel hub, in us the wheel hub receiving a wheel; at least one control arm (36, 37) operably-connected to the wheel hub, for affecting the orientation of the wheel hub with respect to the wheel arm as the retractable wheel assembly is moved between the stored position and the in-use position; and drive means (34) connected to the assembly support and operably connected to the at least one wheel arm and the at least one control arm, for providing rotation of the at least one wheel arm and at least one control arm about a common axis between the stored position and the in-use position.
摘要:
A toner consists essentially of food-grade components. Because the toner consists essentially of food-grade components, it can be used to provide a coating or create an image on food products, including those intended for human or animal consumption.
摘要:
A method and apparatus are provided for generating and updating a concept dictionary 140 in respect of an information system 125 and for using that concept dictionary to assist in selecting queries and query terms for use in interrogating that information system 125. A lexical reference source 115 is first used to generate queries semantically related to a query 110 entered by a user, and the answers returned for each query are analysed using a fuzzy processing technique (135) to determine semantic relationships between the queries. The queries and the determined relationships are recorded in a concept dictionary 140 for subsequent use.
摘要:
A trolley, comprising a retractable wheel assembly (31, 32) movable between stored and in-use positions. The wheel assembly comprising an assembly support; at least one wheel arm (35) operably-connected to a wheel hub, in us the wheel hub receiving a wheel; at least one control arm (36, 37) operably-connected to the wheel hub, for affecting the orientation of the wheel hub with respect to the wheel arm as the retractable wheel assembly is moved between the stored position and the in-use position; and drive means (34) connected to the assembly support and operably connected to the at least one wheel arm and the at least one control arm, for providing rotation of the at least one wheel arm and at least one control arm about a common axis between the stored position and the in-use position.
摘要:
A method and apparatus are provided for generating, from an input set of documents, a word replaceability matrix defining semantic similarity between words occurring in the input document set. For each word, distinct word sequences of predetermined length are identified from the documents of the set, each word sequence being indicative of the context in which the word was used and, according to the relative frequency of occurrence of the identified word sequences for the word, fuzzy sets are generated for each word comprising membership values for corresponding groups of word sequences. For each pair of words occurring in the document set, their respective fuzzy sets are used to calculate the probability that the first word of a pair is semantically suitable as a replacement for the second word of the pair, these probabilities being collated to form a word similarity matrix for use in an improved method of determining document similarity and in information retrieval.
摘要:
An electro-optic semiconductor device comprising a semiconductor waveguide with a core region within which is located at least one active area wherein the core of the waveguide outside of the one or more active areas are not contaminated by diffuse active area material and the one or more active area(s) and the waveguide are monolithic and are grown in an additive growth process. Also provided is a method of making an electro-optic semiconductor device, comprising the steps of; growing a first part of a core layer of a semiconductor waveguide, selectively growing an active layer over a partial area of the first part of the core layer, and growing a second part of the core layer of the semiconductor waveguide over the first part and the active layer, characterised in that the method comprises an additive growth process.
摘要:
A tool for aligning the leads or pins of a connector while they are inserted in the holes of the electronic package to which the connector will be attached is described. Guide rails, which are attached to a fixed-block on one end and a removable slidable block at the other end, are placed between the leads to align them in one direction. A comb having protruding teeth is positioned so that the teeth are placed between the leads in a direction perpendicular to the guide rails. The guide rails and teeth align and constrain the leads in the same pattern as the holes of the package and a clamp holds the guide rails and teeth in place. After the leads have been started to be inserted in the holes of the electronic package the comb is removed. The slidable block is removed from one end of the guide rails, and the guide rails are pulled out of their position between the leads. The connector leads are then fully inserted into the holes.