of the Invention An internally-cooled blown-film system, for producing plastic tubing, in which the flow rate of the continuous flow of internal cooling air, through sensing means, is made directly dependent upon the deviation in position of the tube wall.

A mold has a core surrounded by an outer sleeve which defines with the core an annular axially extending passage. An adjustment element in the form of a ring or sleeve is displaceable in this passage so as to vary the radial dimension of a tubular blank that is extruded from the outlet end of the passage. The adjustment ring or sleeve may be elastically deformable by means of hydraulic cylinders o...

A refractory inorganic oxide support is impregnated with a mixture which contains a platinum sulfito complex solution, a palladium sulfito complex solution, and a rhodium nitrate solution and has a pH of from about 1 to about 5. Activation of the impregnated support provides a three-way automotive exhaust catalyst having high efficiency and improved durability by a single impregnation method.

In a communication network comprising block switching nodes interconnected by transmission links, a flow control mechanism is provided in each switching node for regulating the flow of addressed data blocks or messages. A hardware look-ahead mechanism effective within each node tests for each data block received from a link and buffered at an input port, whether it can be accepted at the appropria...

Nuclear fuel arrangement comprises an outer cover which forms a channel divided up by bent plates to form separate sections, each contg. fuel rods. The plates are arranged so that a central channel is formed for undercooled moderator. The plates are fixed to longitudinal strengthening bars which have openings along their length. Arrangement reduces the tendency for the central region of the fuel t...