Abstract: A memory enhancer comprising a composition containing 2-(7-indenyloxymethyl)-morpholine or an acid addition salt thereof as the effective component.

Abstract: A process is provided for isomerizing (1) cis-3-methyl-.DELTA..sup.4 -tetrahydro-cis,cis-phthalic anhydride into (2) trans-3-methyl-.DELTA..sup.4 -tetrahydro-cis,cis-phthalic anhydride, which is its stereoisomer, by heating the compound (1) preferably at a temperature of 100.degree. to 250.degree. C. in the presence of an alkali metal compound such as lithium hydroxide, sodium hydroxide or sodium acetate. A mixture of said compounds (1) and (2) in a ratio by weight of 7:3 to 2:8 obtained by the isomerization reaction is liquid at room temperature and can be used advantageously as a curing agent for epoxy resins.

Abstract: This disclosure relates to an integrated circuit using an insulated gate field effect transistor of the punch-through type for use in high speed electronic computation. Until now the punch-through phenomena has been considered a defect in the insulated gate field effect transistor. However, the effective utilization of the punch-through phenomena is achieved by using a specially designed insulated gate field effect transistor having a selected structure or material.

Abstract: Structure for supporting the excavated wall of a tunnel comprises a plurality of unit pipe support members connected in end-to-end relation by pipe couplings with lap joints, or by flanges on the ends of the support members, to form a plurality of sub-assemblies which are then connected by a closure member to form a pipe support having a periphery substantially conforming to the periphery of the tunnel wall, and having ports through which the pipe support can be filled with mortar or concrete. The unit pipe support members are substantially the same size and shape for mass production from ductile cast iron or cast steel and are provided with integral reinforcing ribs.

Abstract: A high-crystalline petroleum coke is produced from low-sulfur petroleum feedstock such as virgin crude oil, distillation residuum and cracked residium by subjecting the feedstock to preheat treatment under specific conditions to effect cracking and soaking thereof, subjecting the preheat-treated feedstock to flash distillation to remove non-crystalline substances contained therein as pitch and to recover distillate, fractionating the distillate to provide a heavy residue and subjecting the heavy residue to a delayed coking under specific conditions to produce the desired coke which has a coefficient of thermal expansion of less than 1.0 .times. 10.sup.-6 /.degree. C over 100.degree.-400.degree. C.

Abstract: A petroleum coke of unusually high-crystalline texture and of high purity is produced from a low-sulfur petroleum material by a process including a preheat-treating step for removing non-crystalline substances contained in the material as pitch or coke and a coking step wherein a heavy oil derived from the preceding step is coked in a coking crystallizer in such a manner that pitch-like heavy oil downwardly flows and is progressively accumulated and coked therein while gaseous light hydrocarbons are discharged at the upper part of crystallizer whereby the coking is conducted with a high growth and high orientation of coke crystals formed.

Abstract: Any kind of virgin, low-sulfur crude oil is directly treated in a two-stage delayed coking process for yielding non-crystalline coke in the first stage and high-crystalline coke in the second stage, which process comprises preheating the crude oil in a tube heater to 460.degree. - 520.degree.C under 5-20 kg/cm.sup.2 G, maintaining the oil therein at that temperature for 30 - 500 seconds to allow the oil to be heat-soaked, subjecting the oil to first delayed coking under relatively mild conditions and subjecting the uncoked heavy residual oil to second delayed coking under relatively severe conditions.