General iterative array

A general iterative array is described, which performs many useful switching functions as well as any combination of the fundamental arithmetic operations.     

Bolus injection test for measurement of cerebrospinal fluid absorption

The significance of the bolus injection test lies in supplying data for evaluation of the cerebrospinal fluid (CSF) bulk flow. It provides pressure-time (PT) curves by the process of direct recording, while the pressure-volume (PV) and volume-time (VT) plots are subsequently computed...     

A dual mechanism for the anticonvulsant action of aminooxyacetic acid

The intramuscular injection of aminooxyacetic acid (AOAA) into mice elevated the concentration of gamma-aminobutyric acid (GABA) in the brain, inhibited glutamic acid decarboxylase activity and delayed the onset of isonicotinic acid hydrazide induced seizures. Analyses of these results and of those obtained previously by the authors and other workers indicated that the anticonvulsant action of AOAA involved two mechanisms. One, involving GABA metabolism, was most effective 6 h after AOAA administration, and the other, not involving GABA, was maximally effective 1.5 h after AOAA injection and was completely absent after 6 h. Depending on the convulsant agent under study, the mechanism of the anticonvulsant action of AOAA was purely of the GABA type, purely of the non-GABA type or a combination of both types.     

Operator dependence of 3-D ultrasound-based computational fluid dynamics for the carotid bifurcation

The association between vascular wall shear stress (WSS) and the local development of atherosclerotic plaque makes estimation of in vivo WSS of considerable interest. Three-dimensional ultrasound (3DUS) combined with computational fluid dynamics (CFD) provides a potentially valuable tool for acquiring subject-specific WSS, but the interoperator and intraoperator variability associated with WSS calculations using this method is not known. Here, the accuracy, reproducibility and operator dependence of 3DUS-based computational fluid dynamics were examined through a phantom and in vivo studies. A carotid phantom was scanned and reconstructed by two operators. In the in vivo study, four operators scanned a healthy subject a total of 11 times, and their scan data were processed by three individuals. The study showed that with some basic training, operators could acquire accurate carotid geometry for flow reconstructions. The variability of measured cross-sectional area and predicted shear stress was 8.17% and 0.193 N/m/sup 2/ respectively for the in vivo study. It was shown that the variability of the examined parameters was more dependent on the scan operators than the image processing operator. The range of variability of geometrical and flow parameters reported here can be used as a reference for future in vivo studies using the 3DUS-based CFD approach.     

Spatial distribution of power coupling in self-pumped photorefractive reflection gratings

The spatial distribution of the power transfer achieved by contradirectional two-beam coupling using self-pumped photorefractive reflection gratings is investigated in two materials with different photorefractive gain coefficients, LiNbO3:Fe and KNbO3:Fe. Incremental portions of the volume grating are erased optically by inducing thin optical damage planes, reducing the overall two-beam coupling efficiency. By monitoring the effect of local grating disruption, the distribution of power transfer is spatially resolved throughout the crystal, and the results are found to be in agreement with our theoretical predictions.     

One-way experimentation does not prove one-way causation.

Comments on the defense of the external validity of laboratory experiments by L. Berkowitz and E. Donnerstein (see record 1982-29293-001), arguing that they overlook the fact that lab experiments are not adept at demonstrating exclusive 1-way causality when 2-way causality is a distinct possibility in real-world settings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Multiattribute Water Resources Decision Making

Field reconnaissance with decision makers in San Angelo, Texas led to the selection of dependability, environmental degradation, economic growth potential, quantity, quality, cost, social acceptance and flexibility as the important attributes to be considered in their supplementary water resource development decision problem. The decision analysis solution to San Angelo's decision problem has been determined and is presented. A sensitivity analysis of utility assessments was conducted with the use of Monte-Carlo simulation.     

Studies of thermal-hydraulic phenomena in EBR-II

An experimental and theoretical program has been undertaken during the past several years with the objective of developing a well-documented understanding of steady-state and transient thermal-hydraulic behavior in EBR-II. The results of this effort have provided reactor designers and system modelers with needed integral-type demonstrations of important phenomena. This paper will discuss the particular problems of steady-state and transient hot channel peaking factors and plant operational characteristics impact upon natural circulation dynamics. Direct in-core experimental measurements have demonstrated that factors used for the prediction of peak coolant temperature rises at normal rated plant conditions may not be conservative due to pin-bundle distortions or inlet flow maldistributions, while those applied during loss-of-flow transients are most likely overconservative due to inter- and intrasubassembly phenomena. The importance of somewhat controllable parameters such as the sequence of primary and secondary pump trips and reactor scram, primary pump rundown times, and nominal operational power-to-flow ratio upon the dynamics of the transition from forced to natural convective flow are also presented.     

Effects of trust, aspiration, and gender on negotiation tactics.

Used 60 male and 60 female undergraduates in same sex dyads to study the effects of trust (defined as belief that the other negotiator is cooperatively motivated), aspirations, and gender on the conditions and processes leading to outcomes that jointly benefit both parties. Under high aspirations, high trust produced self-consciously cooperative behavior in the form of direct information exchange; low trust produced self-consciously distributive (competitive) behavior and one form of indirect information exchange. A correlational analysis showed that joint benefit was a positive function of a set of trial and error tactics and 2 forms of indirect information exchange, a negative function of the use of distributive tactics, and unrelated to direct information exchange. Joint benefit was greater under higher aspirations but was not a function of trust or the interaction between trust and aspirations. Women engaged in less distributive behavior and were less interested in the task than men, especially under high aspirations. A theory of strategic choice is presented to explain the findings. (14 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Target detectability as a function of target speed, noise level, and location.

An experiment was conducted using a PPI radar display on which 40 Ss observed targets displayed in each of 4 contiguous 30-degree scope sectors at each of 4 radial velocities under 2 levels of visual noise. Analysis of variance of the mixed Latin-square design did not reveal reliable differences in scores due to velocity, noise level, or velocity orders. More target designations occurred for the inner than the outer contiguous scope sectors (p = .001), although the ratios of correct to total calls per sector were not different (p > .05). These results were interpreted as being due to differences in scan frequency rather than reinforcement frequency. From Psyc Abstracts 36:05:5LK26B. (PsycINFO Database Record (c) 2010 APA, all rights reserved)