Comparison of the imaging characteristics of curved-channel and straight-channel microchannel plates

We have measured and compared the spatial fidelity of two types of microchannel plates over roughly half of their active area. Measurements of the spatial fidelity of curved-channel microchannel plates confirm earlier reports of large (>25 mum), irregular position offsets between the front and the back of the microchannel plates. Straight-pore microchannel plates used in a chevron configuration, on the other hand, showed almost no such position offsets (<4 mum).     

Influence of Minor Alloying Elements on Selective Oxidation and Reactive Wetting of CMnSi TRIP Steel during Hot Dip Galvanizing

The influence of the addition of minor alloying elements on the selective oxidation and the reactive wetting of CMnSi transformation-induced plasticity (TRIP) steels was studied by means of galvanizing simulator tests. Five TRIP steels containing small alloying additions of Cr, Ni, Ti, Cu, and Sn were investigated. After intercritical annealing (IA) at 1093 K (820 °C) in a N₂ + 5 pct H₂ gas atmosphere with a dew point of 213 K (?60 °C), two types of oxides were formed on the strip surface: Mn-rich xMnO·SiO₂ (x > 1.5) and Si-rich xMnO·SiO₂ (x < 0.3) oxides. The addition of the minor alloying elements changed the morphology of the Si-rich oxides from a continuous film to discrete islands and this improved the wettability by molten Zn. The improved wetting effect of the minor alloying elements was attributed to an increased area fraction of the surface where the oxides were thinner, enabling a direct unhindered reaction between Fe and the Al in the liquid Zn and the formation of the inhibition layer during the hot dip galvanizing. The addition of a small amount of Sn is shown to significantly decrease the density of Zn-coating defects on CMnSi TRIP steels.     

Validity generalization: Rejoinder to Schmidt, Hunter, and Raju (1988).

A rejoinder to the Schmidt, Hunter, and Raju (1988) critique of James, Demaree, and Mulaik (1986) is presented. It is proposed that the recommendations offered by James et al (1986) remain intact. These recommendations were that greater attention be given to alternative explanations of the results of validity generalization (VG) analyses, that use of the 75% rule be discontinued, and that VG analyses be predicated on Fisher z coefficients. In addition, the implication of low statistical power for interpreting results of a VG analysis is considered and the potential need for new mathematical models for VG is reviewed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Relation of eighth graders' family structure, gender, and family environment with academic performance and school behavior.

[Correction Notice: An erratum for this article was reported in Vol 80(3) of Journal of Educational Psychology (see record 2008-10692-001). Table 2 contained incorrect data. The first column of data contained correlations whose signs should have been reversed. The complete correct table appears in the erratum.] The purpose of this study was to assess how family structure, gender, and family environment were related to both academic performance (end-of-the-year grades and quantitative and verbal achievement factor scores) and school behavior (number of days absent, number of days tardy, and number of in-school detentions). Subjects were 219 middle-class eighth graders (96 boys, 123 girls). Generally, students in two-parent nuclear families had better academic performance and less problematic school behavior than did students in either mother-custody or stepfather families. Boys had more detentions than did girls. Despite significant differences among the three family structures, the family structure variable accounted at most for only 7% of the variability in academic performance and school behavior. A family environment that emphasized achievement and intellectual pursuits accounted for variability in end-of-the-year grades beyond that accounted for by family structure, gender, and family conflict. The joint consideration of family structure, gender, and family environment accounted at most for 17% of the variance in academic performance and school behavior. For students in the mother-custody and stepfather families, contact with father was unrelated to academic performance. Findings are discussed in terms of models of achievement motivation and behavior. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Burnout among licensed psychologists.

We examined the extent of burnout and its correlates in a national sample of 562 licensed, doctoral-level, practicing psychologists employed primarily within human service settings. Their responses to the Maslach Burnout Inventory indicated that more than a third of the sample reported experiencing high levels of both emotional exhaustion and depersonalization. The modal burned-out clinician in this sample was young, had a low income, engaged in little individual psychotherapy, experienced feelings of lack of control in the therapeutic setting, and felt overcommitted to clients. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Characterization of Lunar Dust for Toxicological Studies. II: Texture and Shape Characteristics

The morphology (shape and texture) of dust fractions of five Apollo lunar soils and a lunar dust simulant, JSC-1Avf, was studied using scanning electron microscopy. Shape (aspect ratio and complexity) of particles was described based on the two-dimensional projection images. The distributions of aspect ratio and complexity of particles are reported. It was determined that the Apollo lunar dust particles consist mainly of impact-produced glass, with complicated morphologies, extensive surface areas per grain, and sharp, jagged edges. Importantly, many grains contain elaborate vesicular textures, representing minute agglutinates. Dust simulant JSC-1Avf also has similar shapes as lunar dust, but differs in surface texture and area (smooth and nonvesicular). These data provide information for toxicity studies of lunar dust and for selecting a suitable lunar dust simulant.     

A longitudinal investigation of stress spillover in marriage: Does spousal support adequacy buffer the effects?

Stress spillover in marriage was examined within a stress-buffering conceptual framework in a multiwave, longitudinal sample of newlywed husbands and wives (N = 101 couples). Spousal support, chronic role strain, and marital satisfaction were assessed 4 times over 3 years and analyzed via actor-partner interdependence model and growth curve analytic techniques. Greater escalation in husbands' role strain over the first 3 years of marriage was associated with steeper declines in their marital satisfaction regardless of the adequacy of spousal support provided by their wives. In contrast, greater escalation in husbands' and wives' role strain was associated with significantly less marital decline for wives, and these links were bolstered when husbands provided wives with more adequate support. The present study is one of the first to explicate the underlying processes through which role strain and spousal support facilitate and mitigate the developmental course of marital satisfaction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Face and emotion recognition deficits in Turner syndrome: A possible role for X-linked genes in amygdala development.

Face recognition is thought to rely on configural visual processing, Where face recognition impairments have been identified, qualitatively delayed or anomalous configural processing has also been found. A group of women with Turner syndrome (TS) with monosomy for a single maternal X chromosome (45, Xm) showed an impairment in face recognition skills compared with normally developing women. However, normal configural face-processing abilities were apparent. The ability to recognize facial expressions of emotion, particularly fear, was also impaired in this TS subgroup. Face recognition and fear recognition accuracy were significantly correlated in the female control group but not in women with TS. The authors therefore suggest that anomalies in amygdala function may be a neurological feature of TS of this karyotype. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Retrospection in social dilemmas: How thinking about the past affects future cooperation.

This article reports 2 studies investigating the effects of retrospective thought on future cooperation in social dilemmas. Some general theories of cooperation presume, but have not tested, whether retrospection has impact: People may think about the choices they could have made instead, realize that cooperation would have produced larger outcomes, and change their strategy as a result. Across both studies, the authors show that rate of future cooperation is directly related to the number of best-case scenarios and inversely related to the number of worst-case scenarios generated. The 2nd study also shows that the number and type of retrospective thoughts generated can be predicted from the person's social value orientation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cognitive and neuropathologic correlates of Stroop Color-Word Test performance in Alzheimer's disease.

The Stroop Color-Word Test (SCWT; C. Golden, 1978) was examined in 59 patients with probable Alzheimer's disease (AD) and in 51 demographically comparable normal control (NC) participants. AD patients produced significantly larger Stroop interference effects than NC participants, and level of dementia severity significantly influenced SCWT performance. Principal -components analyses demonstrated a dissociation in the factor structure of the Stroop trials between NC participants and AD patients, suggesting that disruption of semantic knowledge and speeded verbal processing in AD may be a major contributor to impairment on the incongruent trial. Results of clinicopathologic correlations in an autopsy-confirmed AD subgroup further suggest the invocation of a broad network of integrated cortical regions and executive and language processes underlying successful SCWT performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)