The impact of killing on mental health symptoms in Gulf War veterans.

This study examined the impact of killing on posttraumatic stress symptomatology (PTSS), depression, and alcohol use among 317 U.S. Gulf War veterans. Participants were obtained via a national registry of Gulf War veterans and were mailed a survey assessing deployment experiences and postdeployment mental health. Overall, 11% of veterans reported killing during their deployment. Those who reported killing were more likely to be younger and male than those who did not kill. After controlling for perceived danger, exposure to death and dying, and witnessing killing of fellow soldiers, killing was a significant predictor of PTSS, frequency and quantity of alcohol use, and problem alcohol use. Military personnel returning from modern deployments are at risk of adverse mental health symptoms related to killing in war. Postdeployment mental health assessment and treatment should address reactions to killing in order to optimize readjustment. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Perceived beneficial and detrimental postwar responses of Israeli adults: Are they positively or negatively linked to each other?

This study first compares two theoretical perspectives on the links between beneficial and detrimental posttraumatic responses. One group of studies claims that positive posttraumatic responses tend to be positively related with negative stress-related responses. Others posit that, after a severe stress, these responses are negatively correlated with each other. We argue that these contradictory results represent the different theoretical positions on the nature of favorable postwar outcomes. A second issue investigated is the associations of beneficial and detrimental postwar responses with demographic variables as well as with exposure to the stress of war. An Israeli adult sample (n = 870) was administered two different measures of negative posttraumatic outcomes (resource loss and postwar symptoms) and two different measures of positive posttraumatic outcomes (resource gains and posttraumatic recovery) one year after they were badly affected by a war. Resource gains correlated positively with resource loss, whereas PTR correlated negatively with postwar symptoms. There were also positive associations between the two measures of stress as well as the two beneficial posttraumatic outcomes. Older age, being a woman, lower economic status, and higher exposure to traumatic events tended to correlate positively with both measures of detrimental outcomes. These variables correlated negatively with PTR, and three of them (excluding economic status) were not significantly linked with resource gains. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

A criterion for flow mechanisms through vertical sharp-edged orifice and model for the orifice discharge coefficient

According to the experimental data of the orifice discharge coefficient for the flow through a vertical sharp-edged orifice obtained in the previous study of this work,a theoretical criterion for flow mechanisms of small orifice(viz.thick-walled orifice and nozzle) and large orifice(viz.thin-walled orifice) was proposed based on the ratio of orifice diameter to plate thickness.It can help explain the dissipation of the mechanical energy loss in the flow process for the two flow mechanisms under different operating regimes.The main parameters such as orifice diameter,plate thickness and liquid head were correlated,and a semi-empirical model for orifice coefficient and an empirical model with high precision at the stable region were developed.     

锥束CT扫描方式对ART算法图像重建的影响研究

平板探测器锥束CT的扫描方式对ART(Algebraic Reconstruction Techniques)算法图像重建会产生影响.本文用128×128×128三维Shepp-Logan头部模型作为仿真对象,探讨了不同源-扫描中心距离、投影数、缺角度下扫描方式对图像重建的影响.结果表明,源-扫描中心距离与扫描中心-探...     

变速箱活塞座封油槽表面滚压技术

利用滚压法使活塞座封油槽的表面粗糙度达到Ra0.8以上,增大了封油槽铸造组织密度,提高了活塞座封油槽表面耐磨性,降低了维修成本,延长整机的使用寿命,提高了整机性能。     

中厚板轧制轧件头尾翘曲研究进展

轧件头尾翘曲问题成为中厚板轧制生产中的关键问题之一,直接影响板材的成材率和产品质量。本文综述了近年来国内外关于中厚板轧制轧件头尾翘曲的最新研究进展,分析了轧件上下表面的温度差、轧制压下率、轧制导入角、异径异速轧制和变形区几何形状等对板材翘曲的影响,并介绍了中厚板轧制轧件头部翘曲的控制模型研究现状。     

转炉氧枪粘钢原因分析及预防措施

本文从氧枪喷头、原材料和操作方面对氧枪粘钢进行了比较详细的分析,并提出了相应的预防措施,较好地解决了氧枪粘钢问题。     

XD系列全液压动力头岩心钻机的研制和应用

简要概述了全液压动力头岩心钻机目前的发展状况,分析了XD系列全液压动力头岩心钻机的特点、结构组成、性能参数以及钻机的应用情况。     

测井电缆头的可靠性设计及应用

测井电缆头是生产测井仪器的重要组成部分,是连接电缆和井下仪器的部件。在电缆头的结构设计中,电缆与电缆头的连接形式是设计的核心部分。文章以对比的形式,介绍了两种不同电缆-电缆头连接方式,阐述了＂锥度头＂电缆固定形式的可靠性。