Negative affectivity and the reporting of stressful life events.

Replicated D. T. Lykken's study (see record 1968-18058-001) to resolve the conflict between the findings of S. R. Maddi et al (see record 1987-22446-001) and those of D. H. Schroeder and P. T. Costa (see record 1984-23643-001) regarding the impact of negative affectivity (NA; i.e., neuroticism) contaminated life event items on observed life event–illness relationships. Among 330 managers and professionals, NA-contaminated items correlated significantly with 3 measures of well-being (depression, life satisfaction, and physical symptoms). In 2 of 3 cases, correlations between contaminated items and well-being measures were significantly different from correlations between uncontaminated items and well-being indicators. Prior life event–well-being findings may be inflated considerably by the use of NA-contaminated events. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Neuropsychological issues in litigation following traumatic brain injury.

Provides information about issues confronting neuropsychologists involved in brain injury litigation. Neuropsychologists are often involved as experts in the litigation process because of their unique role in assessment and treatment of brain injury sequelae. Focus is on evaluation, preparation of reports, testimony, professional credibility, ethics, and responsibilities to the patient. Criteria for evaluating the expertise and credentials of psychologists hired by attorneys are presented. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Collective self-esteem and ingroup bias.

In addition to personal self-esteem, we propose that there is a second type of self-esteem, collective self-esteem. People who are high in trait collective self-esteem should be more likely to react to threats to collective self-esteem by derogating outgroups and enhancing the ingroup. In a study using the minimal intergroup paradigm, trait personal and collective self-esteem were measured, and subjects received information about the average performance of their group. Subjects high in collective self-esteem varied their ratings of above-average and below-average scorers on the test in an ingroup-enhancing fashion, whereas those low in collective self-esteem did not. Analyses based on personal self-esteem did not show this interaction. We conclude that collective self-esteem is an individual difference variable that may moderate the attempt to maintain a positive social identity. The relation between collective and personal self-esteem is discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Representational momentum in memory for pitch.

When a visual pattern is displayed at successively different orientations such that a rotation or translation is implied, an observer's memory for the final position is displaced forward. This phenomenon of representational momentum shares some similarities with physical momentum. A previous paper (M. H. Kelly and J. J. Freyd; see record 1987-33467-001) demonstrated a forward memory asymmetry using implied changes in pitch for Ss without formal musical training. This current paper replicates that earlier finding and shows that the forward memory asymmetry occurs for Ss with formal musical training as well (Exp 1). The structural similarity between representational momentum in memory for pitch with previous reports of parametric effects using visual stimuli are shown. A velocity effect for auditory momentum (Exp 2) is reported, it is demonstrated specifically that the velocity effect depends on the implied acceleration (Exp 3), and it is shown that the stopping function for auditory momentum is qualitatively the same as that for visual momentum (Exp 4). The implications of these results for theories of mental representation are considered. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Wet-etching of precipitation-based thin film microstructures for micro-solid oxide fuel cells

In micro-solid oxide fuel cells (μ-SOFCs) ceramic thin films are integrated as free-standing membranes on micromachinable substrates such as silicon or Foturan^® glass ceramic wafers. The processing of μ-SOFCs involves unavoidable dry- or wet-chemical etching for opening the substrate below the free-standing fuel cell membranes. In the first part of this paper current dry- and wet-chemical etchants for structuring of ceria-based electrolyte materials are reviewed, and compared to the etch-rates of common μ-SOFCs substrates. Wet-chemical etchants such as hydrofluoric acid are of high interest in μ-SOFC processing since they allow for homogeneous etching of ceria-based electrolyte thin films contrary to common dry-etching methods. In addition, HF acid is the only choice for substrate etching of μ-SOFC based on Foturan^® glass ceramic wafers. Etching of Ce_0.8Gd_0.2O_1.9?x spray pyrolysis electrolyte thin films with 10% HF:H₂O is investigated. The etch-resistance and microstructures of these films show a strong dependency on post deposition annealing, i.e. degree of crystallinity, and damage for low acid exposure times. Their ability to act as a potential etch-resistance for μ-SOFC membranes is broadly discussed. Guidance for thermal annealing and etching of Ce_0.8Gd_0.2O_1.9?x thin films for the fabrication of Foturan^®-based μ-SOFCs is given.     

Global sensitivity analysis of wind turbine power output

The dynamics of wind turbine behavior are complex and a critical area of study for the wind industry. Identification of factors that cause changes in turbine performance can sometimes prove to be challenging, whereas other times, it can be intuitive. The quantification of the effect that these factors have is valuable for making improvements to both power performance and turbine health. In commercial farms, large quantities of meteorological and performance data are commonly collected to monitor daily operations. These data can also be used to analyze the relationship between each parameter in order to better understand the interactions that occur and the information contained within these signals. In this global sensitivity analysis, a neural network is used to model select wind turbine supervisory control and data acquisition system parameters for an array of turbines from a commercial wind farm that exhibit signs of wake interaction. An extended Fourier amplitude sensitivity test is then performed for 2 years of 10‐min averaged data. The study examines the primary and combined sensitivities of power output to each selected parameter for two turbines in the array. The primary sensitivities correspond to single parameter interactions, whereas combined sensitivities account for interactions between multiple parameters simultaneously. Highly influential parameters such as wind speed and rotor rotation frequency produce expected results; the extended Fourier amplitude sensitivity test method proved effective at quantifying the sensitivity of a wide range of more subtle inputs. These include blade pitch, yaw position, main bearing and ambient temperatures as well as wind speed and yaw position standard deviation. The technique holds promise for application in full‐scale wake studies where it might be used to determine the benefits of emerging power optimization strategies such as active wake management. The field of structural health monitoring can also benefit from this method. Copyright © 2013 John Wiley & Sons, Ltd.     

Release of stored thermochemical energy from dehydrated salts

Thermochemical materials, particularly salt hydrates, have significant potential for use in thermal energy storage applications. When a salt hydrate is heated to a threshold temperature, a chemical reaction is initiated to dissociate it into its anhydrous form and water vapor. The anhydrous salt stores the sensible energy that was supplied for dehydration, which can be later extracted by allowing cooler water or water vapor to flow through the salt, transforming the stored energy into sensible heat. We model the heat release that occurs during a thermochemical hydration reaction using relations for mass and energy conservation, and for chemical kinetics and stoichiometry. A set of physically significant dimensionless parameters reduces the number of design variables. Through a robust sensitivity analysis, we identify those parameters from this group that more significantly influence the performance of the heat release process, namely a modified Damköhler number, the thermochemical heat capacity, and the heat flux and flowrate. There is a strong nonlinear relationship between these parameters and the process efficiency. The optimization of the efficiency with respect to the parameters provides guidance for designing engineering solutions in terms of material selection and system properties.     

Analysis of axial‐induction‐based wind plant control using an engineering and a high‐order wind plant model

Wind turbines are typically operated to maximize their performance without considering the impact of wake effects on nearby turbines. Wind plant control concepts aim to increase overall wind plant performance by coordinating the operation of the turbines. This paper focuses on axial‐induction‐based wind plant control techniques, in which the generator torque or blade pitch degrees of freedom of the wind turbines are adjusted. The paper addresses discrepancies between a high‐order wind plant model and an engineering wind plant model. Changes in the engineering model are proposed to better capture the effects of axial‐induction‐based control shown in the high‐order model. Copyright © 2015 John Wiley & Sons, Ltd.     

Competition and school achievement among Anglo-American and Mexican-American children.

Tested the hypothesis that the less competitive orientation of Mexican-American children is related to their lower school achievement. 230 Anglo-American and Mexican-American children attending kindergarten, Grades 1–2, 4, and 6 of a semirural low-income school were administered individual measures of competition, individualism, field independence, and school achievement (California Achievement Tests, Cooperative Primary Tests, and the Comprehensive Tests of Basic Skills). Results indicate significant effects of culture, sex, and age, but competition and individualism were not significantly correlated with each other and were not consistently related to field independence and school achievement. Results support the general conclusion that the less competitive social orientation of Mexican-American children as measured by experimental games is not necessarily a disadvantage with regard to school achievement. (22 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)