The present invention refers to a method for producing a quartz glass crucible for use in pulling silicon single crystal, said crucible having at least a double-layer structure comprising a pore-free transparent inner layer and an opaque base body or outer layer having pores, characterized in that at least the base body is formed with a silica powder maintained in a gas having a mixing ratio of 0.0005 to 0.0065 kg/kg (dry gas), and a quartz glass crucible produced by said production method. The ...

In a device (5) for the manufacture of a quartz glass crucible (2), one section (14, 15) of a wall (13) of the rotating quartz glass crucible (2) is heated at one time by means of at least two electrode arrangements (7, 8) distributed uniformly at the circumference of the quartz glass crucible (2) and generating a first and another electric arc. By providing several electrode arrangements (7, 8), the cooling-down phase of the sections (14, 15) until their reaching the subsequent heating zone (11...

An outer peripheral surface of a cam has an apex disposed of distance from a rotational axis, a first region adjacent the apex opposite to the direction of rotation that increases in distance from the rotational axis during rotation, and a second region adjacent the apex in the rotational direction that decreases in distance from the rotational axis of the cam with the rotation thereof. The apex is disposed where the phase .theta. thereof advances by 15 degrees and 55 degrees or less in the rota...

The present invention is directed to the process for the preparation of 2'-deoxy-2'-halo-.beta.-L-arabinofuranosyl nucleosides, and in particular, 2'-deoxy-2'-fluoro-.beta.-L-arabinofuranosyl thymine (L-FMAU), from L-arabinose, which is commercially available and less expensive than L-ribose or L-xylose, in ten steps. All of the reagents and starting materials are inexpensive and no special equipment is required to carry out the reactions.

A system for reducing the effects of heave movements of a wellhead in an offshore drilling device is provided that includes a frame; a coiled tubing stack supported by the frame; and a heave compensation system for controlling an amount of load transferred from the coiled tubing stack to the wellhead to reduce relative movements between the coiled tubing stack and the wellhead.

Fluid food materials which solidify when cooled are quantitatively supplied successively at a certain thickness in a plate form on cooling and carrying sides; of two cooling and carrying devices, cooled while being carried to form two monolayer platy food materials, and the two platy food materials are bonded and united making use of the surface not yet completely cooled and solidified of the monolayer platy food materials, and thereby producing a layered laminated cheese food and the like consi...

A multilayer structure produced by piling a plurality of laminated cheese foods. Each of the plurality of laminated cheese foods of the multilayer structure has at least three layers. The food with at least three layers includes two external layers of platy food material containing cheese which have inherent releasability from external layers of adjoining ones of the plurality of laminated cheese foods when piled into a multiplayer structure. An intermediate layer of platy food material, which m...

A clamping device for toolless clamping of saw blades equipped with the clamping shank for a hand machine tool has two clamping parts that are pressable against each other. Each of the clamping parts is provided with a support surface for the clamping shank of a saw blade insertable between the clamping parts. At least one of the clamping parts is movable in relation to the other of the clamping parts in order to clamp and release the clamping shank. An independent actuating element is movable b...

An electric cutting tool has a body, a chuck at an end of the body for attaching a cutting implement having a rear end including a recess, and a drive mechanism for driving the chuck to slide in reciprocation for operating the cutting implement. The chuck has a gap for receiving the rear end of the implement, an internal multi-part fixing mechanism for engaging the recess of the cutting implement in the gap, and an outer cylinder having an inner cam surface for acting upon the fixing mechanism. ...

A clamp device for a reciprocating saw is disclosed herein, which does not require the use of a tool for saw blade replacement. The main feature of the device is that two clamping blocks are pivotally mounted on a bracket and each of the clamping blocks has a tooth portion and a cam portion formed on an outer surface thereof. An elastic member is located between the bracket and the clamping blocks. A button connected to a rod, which passes through a cover plate of the bracket and includes a toot...