Tippins et al. (2023) challenge I-O psychologists to more actively – in Miller’s oft-quoted APA presidential address – “give psychology away.” Their article provides stirring examples of the impact several of our colleagues have made in giving psychology away. In thinking about how to encourage and facilitate more of us to volunteer, we’d like to share several thoughts on our roles as I-Os, both as individuals and as a community. In particular, we propose that volunteerism is an expression of our calling as I-Os; suggest five roles we can play as individuals; discuss three roles for the community at-large; and conclude with a call to action.

The mechanisms of unsteadiness in nominally two-dimensional (2-D) shock/turbulent-boundary-layer interactions (STBLIs) cannot be directly extended to three-dimensional (3-D) STBLIs, because of differences in interaction structure; swept 3-D interactions, including the sharp-fin and swept-compression-ramp configurations, are of particular interest in this work. Complications arise from the observation that the separation length employed to scale low-frequency unsteadiness in 2-D (spanwise homogeneous) interactions is not a global property of 3-D (swept) interactions, due to the quasi-conical symmetry of the latter. Also, flow separation in 3-D interactions is topologically different, in that closure of the primary separation cannot occur without breaking the quasi-conical symmetry of the interaction – consequently, the unsteady properties of the separation are different. To address these points, large-eddy simulations are performed to assess unsteadiness in 3-D interactions, with the aim of understanding key differences relative to analogous 2-D interactions, the former of which have received less attention in the literature. The mechanism underlying the prominent band of low-frequency unsteadiness (two decades below the characteristic boundary-layer frequency) is shown to be significantly muted in swept interactions. An interesting scaling for the band of mid-frequency unsteadiness is uncovered (at least one decade below the characteristic boundary-layer frequency). This is a consequence of the observed connection between coherent fluctuations in the separated shear layer and local mean-flow gradients, indicating a mix between competing 2-D and 3-D free-interaction scaling laws. In contrast, high-frequency fluctuations largely retain the 2-D scaling introduced by the incoming turbulent boundary layer. The spatial structure of the mid-frequency coherence in 3-D STBLIs is isolated, revealing the significant influence of these convective coherent structures on shock rippling/corrugation, as well as a spanwise dependence of coherence size consistent with the 3-D mean-flow similarity scaling. Finally, the dynamic linear response of a representative 3-D interaction is compared to that of a representative 2-D interaction; the absolute instability present in the 2-D interaction is not present in the 3-D interaction. The coincident absence of both the absolute instability and associated band of low-frequency unsteadiness in 3-D STBLIs underscores the significance of this absolute instability in facilitating low-frequency unsteadiness in 2-D interactions.

Comprehensive experimental and computational investigations have revealed possible mechanisms underlying low-frequency unsteadiness observed in spanwise homogeneous shock-wave/turbulent-boundary-layer interactions (STBLI). In the present work, we extend this understanding by examining the dynamic linear response of a moderately separated Mach 2.3 STBLI to small perturbations. The statistically stationary linear response is analysed to identify potential time-local and time-mean linear tendencies present in the unsteady base flow: these provide insight into the selective amplification properties of the flow at various points in the limit cycle, as well as asymmetry and restoring mechanisms in the dynamics of the separation bubble. The numerical technique uses the synchronized large-eddy simulation method, previously developed for free shear flows, significantly extended to include a linear constraint necessary for wall-bounded flows. The results demonstrate that the STBLI fosters a global absolute linear instability corresponding to a time-mean linear tendency for upstream shock motion. The absolute instability is maintained through constructive feedback of perturbations through the recirculation: it is self-sustaining and insensitive to external forcing. The dynamics are characterized for key frequency bands corresponding to high–mid-frequency Kelvin–Helmholtz shedding along the separated shear layer $(St_{L}\sim 0.5)$, low–mid-frequency oscillations of the separation bubble $(St_{L}\sim 0.1)$ and low-frequency large-scale bubble breathing and shock motion $(St_{L}\sim 0.03)$, where the Strouhal number is based on the nominal length of the separation bubble, $L$: $St_{L}=fL/U_{\infty }$. A band-pass filtering decomposition isolates the dynamic flow features and linear responses associated with these mechanisms. For example, in the low-frequency band, extreme shock displacements are shown to correlate with time-local linear tendencies toward more moderate displacements, indicating a restoring mechanism in the linear dynamics. However, a disparity between the linearly stable shock position and the mean shock position leads to an observed asymmetry in the low-frequency shock motion cycle, in which upstream motion occurs more rapidly than downstream motion. This is explained through competing linear and nonlinear (mass depletion through shedding) mechanisms and discussed in the context of an oscillator model. The analysis successfully illustrates how time-local linear dynamics sustain several key unsteady broadband flow features in a causal manner.

This paper combines an empirical analysis of national and international attempts to deal with the problem of poverty in China with a normative analysis of capability theory, as developed by Amartya Sen and Martha Nussbaum. In this way, it attempts to highlight the centrality of normative approaches to poverty and its elimination. The paper is in five parts. Section I analyses the history, development and effectiveness of social assistance under the Minimum Living Standards Scheme (MLSS) in China; Section II provides an outline of capability theory; Section III analyses the history, development and effectiveness of the United Nations Development Program's (UNDP) Millennium Development Goals, with a focus on the elimination of poverty in China; Section IV emphasises the importance of a capability approach to the measurement of poverty and outlines what needs to be done to reduce poverty in China; while Section V discusses what still needs to be done to promote an effective anti-poverty strategy in China.

We examined the prospective associations of objective and subjective measures of stress during pregnancy with infant stress reactivity and regulation, an early-life predictor of psychopathology. In a racially and ethnically diverse low-income sample of 151 mother–infant dyads, maternal reports of stressful life events (SLE) and perceived stress (PS) were collected serially over gestation and the early postpartum period. Infant reactivity and regulation at 6 months of age was assessed via maternal report of temperament (negativity, surgency, and regulation) and infant parasympathetic nervous system physiology (respiratory sinus arrhythmia [RSA]) during the Still Face Paradigm. Regression models predicting infant temperament showed higher maternal prenatal PS predicted lower surgency and self-regulation but not negativity. Regression models predicting infant physiology showed higher numbers of SLE during gestation predicted greater RSA reactivity and weaker recovery. Tests of interactions revealed SLE predicted RSA reactivity only at moderate to high levels of PS. Thus, findings suggest objective and subjective measures of maternal prenatal stress uniquely predict infant behavior and physiology, adjusting for key pre- and postnatal covariates, and advance the limited evidence for such prenatal programming within high-risk populations. Assessing multiple levels of maternal stress and offspring stress reactivity and regulation provides a richer picture of intergenerational transmission of adversity.

Despite years of research and practice, dissatisfaction with performance appraisal is at an all-time high. Organizations are contemplating changes to their performance management systems, the most controversial of which is whether to eliminate performance ratings. The pros and cons of retaining performance ratings were the subject of a lively, standing-room-only debate at the 2015 Society for Industrial and Organizational Psychology conference in Philadelphia (Adler, 2015). Given the high interest in this topic, this article recaps the points made by the panelists who participated in the debate. The arguments for eliminating ratings include these: (a) the disappointing interventions, (b) the disagreement when multiple raters evaluate the same performance, (c) the failure to develop adequate criteria for evaluating ratings, (d) the weak relationship between the performance of ratees and the ratings they receive, (e) the conflicting purposes of performance ratings in organizations, (f) the inconsistent effects of performance feedback on subsequent performance, and (g) the weak relationship between performance rating research and practice in organizations. The arguments for retaining ratings include (a) the recognition that changing the rating process is likely to have minimal effect on the performance management process as a whole, (b) performance is always evaluated in some manner, (c) “too hard” is no excuse for industrial–organizational (I-O) psychology, (d) ratings and differentiated evaluations have many merits for improving organizations, (e) artificial tradeoffs are driving organizations to inappropriately abandon ratings, (f) the alternatives to ratings may be worse, and (g) the better questions are these: How could performance ratings be improved, and are we conducting the entire performance management process properly? The article closes with questions organizational members have found useful for driving effective performance management reform.