Examining the functional utility of personal growth initiative in a war-affected Sri Lankan Tamil sample

The present study explored personal growth initiative (PGI;Robitschek, 1998)—the extent a person is motivated to and actively sets goals towards achieving self-improvement—and its relationship to functional impairment and life satisfaction among a war-affected Sri Lankan sample. 200 war-affected Tamil individuals in Sri Lanka completed measures of PGI, wartime experiences, functional impairment, and life satisfaction. Two hierarchical regressions were conducted examining current life satisfaction and degree of functional impairment. After controlling for depression and wartime experiences, PGI was positively associated with life satisfaction. However, no association was observed between PGI and reduced functional impairment. In contrast to other contexts of ethnopolitical violence, PGI was associated with subjective well-being, but not improved functioning. These results have implications for potential utilityof PGI across different contexts of ethnopolitical warfare

Knowing when someone is resilient: Development and validation of a measure of adaptive functioning among war-affected Sri Lankan Tamils

Current measures of adaptive functioning are typically validated using samples from Western populations, which limit their utility in non-Western populations. The present study examines the development and utility of a locally derived measure of adaptive functioning, the Penn/RESIST/Peradeniya Competencies (PRPC) Scale, among Tamil survivors of the Sri Lankan civil war. This scale—developed using data from 622 qualitative interviews of war-affected Sri Lankan Tamils—was administered to three samples of war survivors (N ​= ​539) and was shown to have a three-factor structure that overlapped with domains identified through coding of the qualitative data: religious faith, community respect, and family responsibility. These three domains predicted lower levels of impaired functioning in daily life, as well as lower levels of depression and anxiety as measured by culturally sensitive assessments. Additionally, these domains predicted subjective trajectories of life satisfaction indicative of an adaptive sense of personal identity. These results highlight the value of culturally sensitive measures of adaptive functioning

Investigating corroboration of self-perceived posttraumatic growth among Sri Lankan Tamil survivors of ethnopolitical warfare through trait, domain, and profile agreement approaches.

Though research on assessing posttraumatic growth has been severely critiqued, some evidence suggests close others can observe and report changes in individuals following traumatic life events and are sensitive to idiosyncratic ways in which changes manifest. We extended these findings by investigating corroboration of self-perceived posttraumatic growth (PTG) and depreciation (PTD) as measured by the Posttraumatic Growth Inventory–42 (PTGI-42) among Sri Lankan Tamil war survivors (n = 200). Informants slightly corroborated overall levels of PTG and PTD, while a more nuanced profile analysis procedure revealed overall—but not distinctive—profile agreement. This suggests self–other agreement is modest and may partly reflect shared narratives and collective cultural understandings about how people change after trauma. Results demonstrate further that informants were not sensitive to idiosyncratic ways in which target individuals had changed. Together, the lack of validity evidence suggests that the PTGI-42 may be inadequate in some cross-cultural contexts as a measure of nuanced posttraumatic change (i.e., as a measure of specific changes in the five theorized domains of growth and depreciation). Future work should emphasize culture- and context-sensitive measurement of posttraumatic change, particularly focusing on methods other than retrospective self-reports, such as prospective longitudinal designs

Cold ablation driven by localized forces in alkali halides

Laser ablation has been widely used for a variety of applications. Since the mechanisms for ablation are strongly dependent on the photoexcitation level, so called cold material processing has relied on the use of high-peak-power laser fluences for which nonthermal processes become dominant; often reaching the universal threshold for plasma formation of ∼1 J cm-2 in most solids. Here we show single-shot time-resolved femtosecond electron diffraction, femtosecond optical reflectivity and ion detection experiments to study the evolution of the ablation process that follows femtosecond 400 nm laser excitation in crystalline sodium chloride, caesium iodide and potassium iodide. The phenomenon in this class of materials occurs well below the threshold for plasma formation and even below the melting point. The results reveal fast electronic and localized structural changes that lead to the ejection of particulates and the formation of micron-deep craters, reflecting the very nature of the strong repulsive forces at play

Investigating Corroboration of Self-Perceived Posttraumatic Growth among Sri Lankan Tamil Survivors of Ethnopolitical Warfare Through Trait, Domain, and Profile Agreement Approaches

Though research on assessing posttraumatic growth has been severely critiqued, some evidence suggests close others can observe and report changes in individuals following traumatic life events and are sensitive to idiosyncratic ways in which changes manifest. We extended these findings by investigating corroboration of self-perceived posttraumatic growth (PTG) and depreciation (PTD) as measured by the Posttraumatic Growth Inventory-42 (PTGI-42) among Sri Lankan Tamil war survivors (n = 200). Informants slightly corroborated overall levels of PTG and PTD, while a more nuanced profile analysis procedure revealed overall—but not distinctive—profile agreement. This suggests self-other agreement is modest and may partly reflect shared narratives and collective cultural understandings about how people change after trauma. Results demonstrate further that informants were not sensitive to idiosyncratic ways in which target individuals had changed. Together, the lack of validity evidence suggests that the PTGI-42 may be inadequate in some cross-cultural contexts as a measure of nuanced posttraumatic change (i.e., as a measure of specific changes in the five theorized domains of growth and depreciation). Future work should emphasize culture- and context-sensitive measurement of posttraumatic change, particularly focusing on methods other than retrospective self-reports, such as prospective longitudinal designs

Elastic-Plastic Collapse of Super-Elastic Shock Waves in Face-Centered-Cubic Solids

Shock waves in the [110] and [111] directions of single-crystal Al samples were studied using molecular dynamics (MD) simulations. Piston-driven simulations were performed to investigate the split shock-wave regime. At low piston velocities, the material is compressed initially to a metastable over-compressed elastic state leading to a super-elastic single shock wave. This metastable elastic state later collapses to a plastic state resulting in the formation of a two-wave structure consisting of an elastic precursor followed by a slower plastic wave. The single two-zone elastic-plastic shock-wave regime appearing at higher piston velocities was studied using moving window MD. The plastic wave attains the same average speed as the elastic precursor to form a single two-zone shock wave. In this case, repeated collapse of the highly over-compressed elastic state near the plastic shock front produces ultrashort triangle pulses that provide the pressure support for the leading elastic precursor