Low density compositions containing colloidal-size particulates of an ELM absorber such as Fe3O4 and a particulate of an ELM attenuator such as carbonyl iron dispersed in a dielectric matrix such as a styrene/butyl acrylate copolymer provide improved absorption of electromagnetic radiations.

An automated system lifts a batch of semiconductor wafers from a slotted carrier, transfers them laterally and lowers them into a second slotted carrier. In doing this, jaws on the lifting apparatus open automatically to receive or release the wafers. With a carrier having relatively high slotted sides, such as the commonly used plastic cassette, a pusher engages the lower edge of the wafers expos...

With the proposed device, components are taken from a magazine, transported into the area of a workpiece and are deposited accurately in position on or in this workpiece. The component, which is held by a transport member, will in the normal case assume a position which is eccentric or rotated relative to a theoretical axis. In order to determine the effective actual position of the component, thi...

An internally cooled semiconductor package including a wafer-like semiconductor body with at least two electrical elements, one at a relatively flat surface of the body. A wall of high electrical and heat conductive material abuts the flat surface of the semiconductor body to be in good heat conductive relation therewith and in electrical contact with the same. A fluid flow heat exchanger is on th...

PCT No. PCT/DK84/00038 Sec. 371 Date Jan. 4, 1985 Sec. 102(e) Date Jan. 4, 1985 PCT Filed May 15, 1984 PCT Pub. No. WO84/04645 PCT Pub. Date Nov. 22, 1984.A coupling element for establishing acoustic connection between a cylindrical hearing aid placed in the concha and a custom made ear plug placed in the auditory canal is formed by a disc-shaped element, which can be rotatably mounted a sound exi...

Disclosed is a modulation-demodulation system and method for transmitting a plurality of sequentially received information bit sequences, the system including a transmitter having a state machine for expanding by a coding process each information bit sequence into an expanded bit sequence with a coded bit group portion and, in some cases, an uncoded bit group portion. The transmitter further inclu...

A method and apparatus for compressing alphanumeric data that is stored or transmitted in the form of digital codes. A dictionary is created which assigns each word of the alphanumeric text and the punctuation that follows it to a unique address or token of, illustratively, up to 16 bits (two bytes). Each word in the alphanumeric text is then replaced by the address that refers to that word in the...

A DC-to-DC up-converter of the type wherein voltage is built up across a capacitor by alternately connecting a coil by means of a pulse width modulator-controlled switching transistor across a low DC voltage source and, in series with that source, across the capacitor. Operation is initiated by converting the switching circuit into a blocking oscillator, running the oscillator from the low DC volt...

A transistor chopper for controlling the power delivered to a DC load from a DC source includes two or more transistors connected in series between the DC source and the load and means for controlling the voltage across each transistor so that the transistor is subjected to only a fraction of the open circuit voltage developed by the DC source. Lower power transistors may therefore be used as swit...

During operation of a rotary electric machine coolant tends to enter an air gap between a stator and a rotor thus producing drag losses. This is overcome by an arrangement for preventing the coolant from entering the air gap between the stator and the rotor. The rotary electric machine includes a housing (10) having a stator (12). The stator (12) includes an armature winding (14) with end turns (2...

An angle gear box for a helicopter main rotor drive has a more compact arrangement of the usual gear train elements of the input section as well as a freewheel unit. The input section gear train includes a power input shaft mounted on bearings and having a bevel pinion and a power output shaft mounted on bearings and having a bevel gear meshing with the pinion. The output shaft has an axial chambe...

Folding boxes (10) are held in readiness for filling in the flat folded state in magazines in conjunction with packagaing machines. An erection of the folding boxes is necessary for this purpose. For this purpose there is provided a gripping arm (33) movable pivotably and in translation and having suction cups (34), which removes the respective front folding box (10) from the magazine (19), transp...

1. Utilisation for heat and sound insulation of a material based on chlorovinylic filaments or fibres characterised by the fact that the material is in the form of at least a web based on unstretched crimped chlorovinylic textile filaments or fibres.

The invention relates to a cleansing composition for treating textile surfaces of interior furnishings, said composition including a liquid, foam-type or pulverulent cleanser and including benzyl benzoate as an acaricidal component as well as a solid which causes a pulverulent residue of a particle size suitable for oral ingestion by house dust mites. Water is a predominant component of a liquid c...

An artificial crystalline lens contains an optical lens (1) and three supporting elements, one of which being shaped as a loop (3) and the other two being configured as V-shaped legs (4). The loop (3) and the legs (4) are placed at the diametrically opposite edges of the lens (1). Each of the V-shaped legs (4) is fixed by one of its sides (5) to the front surface of the lens (1) and is inclined in...

A filter press contains a pack of filter plates (1) assembled between the support (2) and squeeze (3) plates, a mechanism (7) for displacing filter plates, a sediment discharging mechanism (15) with toothed racks (17) provided with upwardly directed teeth of a size at least equal to the length of movement of one filter plate, whereas additional racks (19) are mounted under the toothed racks and hi...

A plurality of parallel-connected surface acoustic wave (SAW) resonators, having different oscillation frequencies and different turnover temperatures, are connected to an active element containing circuit to form a SAW oscillator. The oscillator frequency deviation due to temperature is kept within a small allowable range DELTA fa by satisfying the following formulas: fH-fL

An improvement to the reflective multistrip coupler of the surface acoustic wave device described in EPA No. 0098661 for overcoming the k-determined bandwidth limitation wherein, instead of being uniform, the electrode spacing is varied correspondingly along the input and output arrays of the coupler with the result that different frequency bands will be reflected by different groups of electrodes...

The invention relates to a device for lifting and lowering a bedstead having a head part and a foot part forming the narrow sides. A device which is simple in construction and operation results according to the invention in that parts of the head and foot part of the bedstead can each be hooked onto hooked bearing elements of a slide, in that each slide is guided adjustably on the vertical support...