An improved ladder-type leadframe (30) is described for use in connection with the plastic encapsulation of electronic devices (21), particularly semiconductor devices (21). The side rails (15a or 15b) of the leadframe (30), adjacent the die bonding flag (12), are grooved to provide, integral with the leadframe (30), a gas vent (31) to relieve gas pressure inside the mold cavity (43a-b) during pla...

The invention concerns a device for manoeuvring a window casement (1), particularly a window frame that is so pivotally attached to a window frame (2) that the window casement rotates outside of a wall section (3) intended for the attachment of the window frame. An arm (5) has been designed to be pivotally (9) attached to a holder (7) for the window encasement. The arm is formed as parts (5a, 5a')...

The manufg. instruments for a ceramic circuit substrate, which has through holes, comprise a tray (1), dents (1a) in the tray, ceramic green body plates (2) having a thickness of 0.12 mm, arranging plates (8, 11), golden balls (9) having a diam. of 0.1 mm, and a pressing piston (11). The green body plate, arranging plate, and electrically conductive balls are placed on the tray. The balls are inse...

Process for preparing Xanthomonas heteropolysaccharide from Xanthomonas campestris NCIB 11854 and use of the latter, e.g. as viscosity modifier in an aqueous solution, and in a drilling fluid and use in connection with well treatments, and enhanced oil recovery.

A computer-controlled interlocking system for a railway installation which comprises a plurality of sections, each of which sections has an associated plurality of elements, comprises a plurality of section computers to be respectively associated with the sections and arranged to be fail-safe in terms of signaling technology. Each section computer is provided with a respective program memory which...

Controlled amounts of a liquid solvent, such as water, and a filling mash separated into run-off liquid and sugar are supplied to a continuously operated centrifuge where the sugar is dissolved in the solvent, and the resultant sugar solution is drawn off from the centrifuge. In one embodiment, the density of the sugar solution is maintained constant by measuring said density and quantitatively re...

The invention concerns an electrode for arc furnaces, especially for electrosteel production, comprising a metallic liquid-cooled upper shaft (1) and an exchangeable lower active portion (2) of self-consuming material, particularly graphite, whereby a securing means is provided which is electrically insulated against the current-conducting components (11) of the shaft (1) and said securing means d...

A wave length filter construction using fiber optics techniques and devices for selective tuning. By core coupling for a portion of the fiber lengths, a communications facility is provided and various wave length selection structures are enabled.

A method for the N-denitration of secondary N,2,6-trinitroanilines with phase transfer catalysts.

A fluidised-bed mixer (10) for mixing powdered materials is described, comprising a mixing vessel (12) which has a fluidising-gas nozzle unit (32) with a sheath-like housing (34) which surrounds the mixing vessel outlet (18) and is provided with several gas supply ducts. The ducts pass gas streams upwards into the mixing vessel (12) in order to effect fluidised-bed mixing of the powder content of ...

A fluidised-bed mixer (10) for mixing powdered materials is described, comprising a mixing vessel (12) which has a fluidising-gas nozzle unit (32) with a sheath-like housing (34) which surrounds the mixing vessel outlet (18) and is provided with several gas supply ducts. The ducts pass gas streams upwards into the mixing vessel (12) in order to effect fluidised-bed mixing of the powder content of ...

The invention relates to a protective device for the actuating mechanisms of the control clusters during tests under pressure of the primary circuit of a nuclear reactor. Before mounting the clusters, each guidance sheath for the parts connecting the clusters with the control mechanisms is provided with a removable filter dismountably fixed at the lower portion of the sheath. The filter is constit...

A voltage limiter for protecting the thyristors of a current source inverter, also known as a controlled current inverter, wherein the limiter includes a circuit for sensing the respective voltages directly across at least one but preferably across each of the thyristors in the inverter and generating a signal corresponding to the highest value and a regulator circuit which is operable in response...

A voltage limiter for protecting the thyristors of a current source inverter, also known as a controlled current inverter, wherein the limiter includes a circuit for sensing the respective voltages directly across at least one but preferably across each of the thyristors in the inverter and generating a signal corresponding to the highest value and a regulator circuit which is operable in response...

The process consists of introducing into a silicon-contg. layer simultaneously with silicon deposition, another element of column IVa of the periodic classification in a proportion equal to or below 5% of the number of silicon atoms and greater than 0.1%. According to a preferred variant, this element is germanium. Deposition takes place at a temp. close to the crystalln. temp. T. The process can ...

Improved control of a var generator of the static type using thyristors wherein control is accomplished by generating a capacitance command representing the value of an equivalent capacitor, as opposed to a current command or a var command. The gating times or angles of the thyristors are determined by the capacitance command acting through an intermediate control which may be an open-loop feed-fo...

Improved control of a var generator of the static type using thyristors wherein control is accomplished by generating a capacitance command representing the value of an equivalent capacitor, as opposed to a current command or a var command. The gating times or angles of the thyristors are determined by the capacitance command acting through an intermediate control which may be an open-loop feed-fo...

The non-linear control characteristic of a force commutated current source inverter operating as a var generator is linearized to provide a similar dynamic response in both leading and lagging modes of operation by two inter-related control schemes. The first control scheme comprises a linear closed loop feedback which controls a thyristor firing circuit in response to a difference or error signal...

The non-linear control characteristic of a force commutated current source inverter operating as a var generator is linearized to provide a similar dynamic response in both leading and lagging modes of operation by two inter-related control schemes. The first control scheme comprises a linear closed loop feedback which controls a thyristor firing circuit in response to a difference or error signal...

In a power plant which includes a steam turbine with main control valves for admitting steam into the steam turbine and a steam bypass with bypass control valves for diverting steam around the steam turbine directly into a condenser, it is necessary to coordinate the operation of the respective valves so that the steam turbine can be started, brought up to speed, synchronized with a generator and ...