An apparatus for ensuring maximum safety of the relief operation of storage batteries and charging apparatus in transformer stations and power plants includes a charging unit (2) connected with an alternating current supply source (1) and provided with rectifier, filter and voltage regulator, and an accumulator (4) connected in parallel with the charging unit (2). Between each output (2.1) of the ...

The machine for stretching and shaping coils for electrical machines has pivotable bending arms (flexible arms) on which one sliding piece each is arranged having two handles each for seizing the ends of the two straight parts of the coil, each handle being provided with two jaws. Two stretching devices are arranged in the axis of the machine parallel to the axis of rotation of the arms. The stret...

The proposed heating element can be operated on a 6-220 V supply. It contains a 2-100mmthick conductive layer contg. 30-90% by volume of graphite in a synthetic resin. The electrical connection is made to this layer. The outside surface of this conducting layer is provided with a 0.5-3mm thick synthetic resin insulating layer contg. glass or polymer fibre, or other, mineral reinforcement. In some ...

A dental impression composition comprising alginate material and biocidal component . A method for reducing microorganism contamination in alginate dental impressions comprising preparing a mixture comprising alginate, water and biocide.

Entomopathogenic nematodes can be used as bioinsecticides for combating certain undesirable insects. The commercial exploitation of the nematode bioinsecticides has hitherto been limited since it has not been possible to breed or produce nematodes on a commercial scale. It has now been found that by controlling certain parameters it is possible to breed entomopathogenic nematodes, on a commercial ...

Monomers and oligomers containing a plurality of vinylbenzyl ether groups are prepared by reacting a material containing a plurality of aromatic hydroxyl groups such as tetramethyltetrabromobisphenol A with a vinylbenzyl halide such as vinylbenzyl chloride in the presence of a polar aprotic solvent such as dimethylformamide. The monomers and oligomers prepared by this process have an improvement i...

The residence time in the human stomach of pharmaceutical, gastric controlled release, solid units can be increased significantly if the units have a density that is much higher than normal. A preferred oral dosage form according to the invention comprises a capsule or other dosage form having a dimension above 2mm and that contains one or more of the said units. The density of each unit is prefer...