Tensile,fracture toughness and crack growth properties of a roll-extruded HP 9Ni-4Co-25C steel alloy

A section of internal roll-extruded HP 9Ni-4Co-25C steel alloy was obtained from an experimental 120-in. rocket motor case for Titan III and sent to the Air Force Materials Laboratory for evaluation by the Space and Missile System Organization (SAMSO). Tensile and fracture toughness properties were obtained at room temperature and at ?65°F. Crack growth properties were obtained at room temperature in laboratory air and in distilled water. An increase in tensile strength and a decrease in ductility were observed to occur with increased cold forming reduction. Fracture toughness properties appeared to decrease with increased rolling reduction. Fatigue crack growth properties in laboratory air were compatible with other high strength steels for the lower ΔK values. Fatigue crack growth properties in distilled water showed no acceleration due to aqueous environment influences. Statically loaded stress corrosion crack (SCC) growth properties were an improvement over available D6ac steel alloy data.     

Biosynthesis of triglycerides from triose phosphates by microsomes of intestinal mucosa

Microsomes of hamster intestinal mucosa synthesize triglycerides from dihydroxyacetone phosphate or DL-glyceraldehyde 3-phosphate in the presence of palmitate, ATP, CoASH and NADPH or NADH but in the absence of soluble enzymes. An inhibitor of triose phosphate isomerase, 1-hydroxy-3-chloro-2-propanone phosphate, completely inhibits glyceride synthesis from glyceraldehyde 3-phosphate. This compound does not inhibit glyceride synthesis from dihydroxyacetone phosphate. These reactions confirm the conversion of glyceraldehyde 3-phosphate to dihydroxyacetone phosphate prior to glyceride synthesis.     

Incentive shifts in the goldfish.

Trained 157 goldfish with a large or small magnitude of reward in a straight-alley runway. After 20 days of training with a given reward magnitude, 1/2 of the Ss in each group were shifted to the other magnitude of reward. Ss rapidly shifted swimming speeds when reward magnitudes were reversed. No contrast effects were observed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Using a Microprocessor in an Intelligent Graphics Terminal

Graphic terminals allow on-line interaction between the user and his program, thereby enabling him to alter the displayed picutre according to his requirements. However, a major problem with the use of a graphic terminal is the cost associated with it. There is no doubt that low-cost graphic terminals are available, but their utility is very limited since they have no processing capability (or intelligence) and must depend on a host processor attention, while at the same time putting additional strain, on the resources of the host machine. This naturally degrades the response time, depending on the processor load at that time, On the other hand, graphic terminals which have local processing capability are very expensive. With the availability of microprocessors, it is now possible to resolve this delemma: a reasonable amount of intelligence can be added to the terminal at a very reasonable cost. Such a terminal has been developed at the University of Ottawa.     

A time-sharing interactive program for class scheduling

The purpose of this paper is to describe a time-shared class scheduling program that has been implemented and used for the past three years by the Oklahoma City Public Schools. The program uses heuristic procedures in an attempt to minimize student conflicts in a “modified modular scheduling” environment. In addition, the program is interactive so that the scheduler takes an active role in the scheduling decisions.     

Low temperature irradiations of Nb3Sn with 14- MeV neutrons

High energy neutron irradiations have been performed on Nb3Sn superconductors to assess their behavior in a fusion reactor environment. Irradiations were performed at 4.2 K and property measurements were made without warming the samples. The critical current Icincreased with irradiation to a level about 50% above the unirradiated value at the highest fluences reached in our experiments. These results are compared with the results of other low temperature irradiations of Nb3Sn.     

Transfer from conceptual rule problems to a truth-table-sorting task.

Tested the proposal that during conceptual rule learning, Ss encode the stimulus population into 4 stimulus subclasses which are analogous to the categories of a logical truth table. In Exp I (n = 48), 1st and 2nd graders were given 2 or 4 conceptual problems to solve, the number of rules within the series of problems being either 1 or 2 (conjunction or inclusive disjunction). 2 groups were included to control the effects of warm-up and generalized learning sets. Analysis of errors made on the sorting task showed the number of rules that define solution to be a reliable source of variation. Exp II with 48 1st and 2nd graders and 48 undergraduates was similar to Exp I. Number of rules and the interaction of number of rules and age of S were significant variables. Results are taken as support for the stimulus-encoding hypothesis in modified form. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Use of leaf enriching harvesting methods to increase the yield of leaf protein concentrate from lucerne

A prototype leaf stripping machine and a conventional forage harvester with a raised header were used to obtain high protein lucerne (alfalfa) fractions. The stripped lucerne leaves and lucerne tops contained 26.2 and 27.2% protein, respectively. Pilot-scale extraction of the ground leaves and the ground tops resulted in leaf protein concentrate (LPC) yields of 18.8 and 20.0%, respectively, compared with 12.8 and 15.7% for the appropriate whole lucerne control. LPC yields as high as 27.4% were obtained by the addition of lucerne solubles to the lucerne tops prior to grinding. Low LPC yields (4.0–8.0%) were obtained from the lucerne stem fraction. After processing, the press cake fraction from the leaf-enriched feed materials still contained over 17% protein.