Abstract: Disclosed is an improvement to a process for preparing coupled styrenic block copolymers wherein adding from about 0.01 to about 1.5 equivalents of a metal alkyl compound per equivalent of living polymer chain ends to the cement, during or after polymerization, improves coupling efficiencies. The resultant radial styrenic block copolymers have reduced amounts of 5+ arm oligomers which can be very desirable is certain applications, such as the modification of bitumen.

Abstract: Disclosed is an improvement to a process for preparing coupled styrenic block copolymers wherein adding from about 0.01 to about 1.5 equivalents of a metal alkyl compound per equivalent of living polymer chain ends to the cement, during or after polymerization, improves coupling efficiencies. The resultant radial styrenic block copolymers have reduced amounts of 5+ arm oligomers which can be very desirable is certain applications, such as the modification of bitumen.

Abstract: A nuclear magnetic resonance tomography apparatus includes a Faraday cage which shields the measurement space against stray electromagnetic fields, and increases the Q factor of a coil circuit comprising the transmitting/receiving coils of the apparatus. This Faraday cage is arranged around the object space inside the magnetic coils for generating the necessary steady magnetic field, but around and outside the RF transmitting/receiving coil. The transmitting/receiving coil may be provided with comb-like screens which shield against electrical fields, and the Faraday cage may include a readily accessible extension having larger transverse dimensions.

Abstract: A device comprising a transformer for step-wise varying voltages in which, in order to prevent undesired oscillations in the transformer, a circuit is included in the connection lead thereof, said circuit comprising at least one inductive element and at least one rectifying element. The inductance of the inductive element is a number of times higher than the leakage inductance of the transformer. The circuit has the property that the current through the inductive element (elements) does not change its direction when the sign of the voltage between its connection terminals is reversed.