Lattice and grain boundary diffusion of cerium and neodymium in nickel

Diffusion of cerium and neodymium in nickel has been studied by the serial sectioning technique using radioactive tracers¹⁴¹Ce and¹⁴⁷Nd, in the temperature ranges 700° to 1100°C for volume and 500° to 875°C for grain boundary diffusion respectively. Volume diffusivities can be expressed as: $$\begin{gathered} D_{Ce/Ni} = (0.66 \pm 0.18)\exp \left( { - \frac{{60,800 \pm 810}}{{RT}}} \right)cm^2 /\sec \hfill \\ D_{Nd/Ni} = (0.44 \pm 0.13)\exp \left( { - \frac{{59,820 \pm 830}}{{RT}}} \right)cm^2 /\sec \hfill \\ \end{gathered} $$ and grain boundary diffusivities by: $$\begin{gathered} Dg_{Ce/Ni} = 0.11\exp \left( { - \frac{{29,550}}{{RT}}} \right)cm^2 /\sec \hfill \\ Dg_{Nd/Ni} = 0.07\exp \left( { - \frac{{28,580}}{{RT}}} \right)cm^2 /\sec \hfill \\ \end{gathered} $$ Results of volume diffusion have been compared with those calculated from the theories of diffusion based on size and charge difference between the solute and the solvent atoms. Whipple and Suzuoka methods have been used to evaluate the grain boundary diffusion coefficients. Both the methods give similar results.     

Low temperature specific heat and magnetic study of precipitation in a Cu−Co alloy

Specific heat measurements between 1.4° and 4.2°K and magnetization measurements from 4.2° to 300°K with a Cu+0.7 at. pct Co alloy, solution treated at 1000°C and aged at 400°C, give the concentration and dipole moment of precipitated cobalt-rich particles as a function of aging time.     

Querschnittsmessung an Rundwalzdraht und Rundstahl mit Hilfe der Compton-Streuung harter γ-Strahlung

Erörterung der optischen Meßverfahren. Abgrenzung der Meßmöglichkeiten bei Ausnutzung der Wechselwirkung mit harter γ-Strahlung. Photoeffekt, Compton-Streuung, Paarbildung. Abhängigkeit der Meßsignale von Stahlzusammensetzung und Lageänderungen des Drahtes. Vergleich der Absorption mit der Streuung. Erstellung einer Anordnung für 90-Grad-Compton-Streuung. Berechnung der Meßsignale und Erörterung für verschiedene Fälle. Versuche und Vergleich der Ergebnisse mit den Rechnungen.     

Impact of counselor gender and counselor sex role orientation on perceived counselor characteristics.

Assessed the influence of counselor (C) gender (male or female), C sex role orientation (traditional or egalitarian), S's sex role orientation (masculine, feminine, or androgynous), and client problem type (sex role related or not sex role related) on female Ss' judgments of their comfort with disclosing to Cs and their perceptions of the C's attractiveness, expertness, and trustworthiness. Results show that (a) S's ratings of comfort in disclosing was greater with female rather than male and with egalitarian rather than traditional Cs; (b) female egalitarian Cs were perceived as most expert, whereas female traditional Cs were perceived as least expert, and (c) male traditional Cs were perceived as least trustworthy. The presence of C gender and C sex role effects and the absence of effects as a function of problem type and Ss' sex role orientation are discussed. Suggestions are made concerning the need for more consistent definition of sex role orientation and designation of problem type. (21 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Modelling of the Mark I pool suppression system

A mathematic model of the Mark I type pool suppression system is presented, together with its computer implementation. The time-dependent compressible gas dynamics through the vent system and the bubble formation are described.The pressure, velocity and mass flow rates in the system have been determined. Scaling laws and compressibility effects are studied. The analysis forms the starting point for the determination of the pool swell and the dynamic loading of the torus shell.     

Time delay and similarity effects in facial recognition.

Conducted 4 experiments to investigate the ability to 232 undergraduates to recognize a target person, whom they had previously seen in slides or a film, in a test series of pictures. Exp I, which manipulated time delay between seeing the target and starting the test series (from 4 min to 1 wk), demonstrated that delay had no effect on recognition performance. The other 3 studies manipulated similarity between the target person and the decoy pictures preceding the target in the search series. The greater the target-decoy similarity, the poorer the recognition performance. A significant Target Position * Similarity interaction indicated the presence of a larger performance decrement due to position when similarity level was high. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Lipase from egg of southern corn rootworm

The lipolytic activity in homogenates and aqueous extracts of acetone powders of eggs of the southern corn rootworm (Diabrotica undecimpunctata howardi Barber) was studied. The general properties were determined using as substrate olive oil in an emulsion stabilized by gum arabic. Bovine serum albumin or Triton X-100 were required in the assay system; they protected the enzyme from spontaneous denaturation. The lipase had activity optima at pH 7 and at 45 C. The preparation was inactive towards triacetin, and activity increased in the series tripropionin<tributyrin<trihexanoin< trioctanoin<tridecanoin. Activity towards tridecanoin. Triolein was hydrolyzed to oleic acid and glycerol with no marked accumulation, even transient, of partial glycerides.     

The large scale preparation of chromatographic grade hydroxylapatite and its application in protein separation procedures

Methods are described for both the laboratory and plant scale preparations of hydroxylapatite to give 200 ml and 22 litre settled bed volumes respectively. These materials have an average particle size of 75 μm, give flow rates of up to 45 ml cm^?2h^?1 and bind up to 50 mg protein/ml hydroxylapatite at pH 6.8. Examples of protein separations and purifications on hydroxylapatite are given and the nature and basis of hydroxylapatite chromatography is discussed.