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Anisotropic and asymmetric deformation mechanisms of nanolaminated graphene/Cu composites

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Nano Materials Science 2019年第2期1卷 121-130页

作者： shayuan weng Huiming Ning Tao Fu Ning Hu Shu Wang Kaiyan Huang Xianghe Peng H. Jerry Qi Cheng Yan College of Aerospace Engineering Chongqing University Chongqing 400044 PR China Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China Chongqing University Chongqing 400044 PR China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082 PR China The George W. Woodruff School of Mechanical Engineering Renewable Bioproduct Institute Georgia Institute of Technology Atlanta GA 30332 United States School of Chemistry Physics and Mechanical Engineering Science and Engineering Faculty Queensland University of Technology (QUT) 2 George Street G.P.O. Box 2434 Brisbane Australia

We conducted molecular dynamics (MD) simulations of tension and compression along the direction and MD simulations of compression along the and directions on nanolaminated graphene/Cu (NGCu) composites to investigate the effects of the incorporated graphene and the deformation mechanisms related to the loading direction. The deformation behavior and the defect structures were found to be strongly dependent on the loading conditions. An asymmetric tension-compression deformation behavior was thus found in graphene/Cu nanolaminates under the loading, which was dominated by stacking faults and deformation twins formed by dislocation slide under tension and compression, respectively. High density and ordered nanotwins were formed at the graphene/Cu interfaces. Two different formation mechanisms of the twins were found under the compression, and the nucleated twins were easy to be thickened with the assistance of the graphene wrinkles. Multiple twins were formed under the compression by the dislocation cross-slip. This study provides a way to introduce graphene reinforcement and twin boundary to Cu matrix composites and design nanotwinned graphene/Cu composites with excellent mechanical performance.

关键词： Deformation Mechanisms Molecular Dynamics Graphene/Cu Composites Interface Twin

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护士专职夜班岗位的设置与管理

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中国护理管理 2015年第2期15卷 200-203页

作者：叶曼魏芳黄金欧阳沙媛李迎霞中南大学湘雅二医院胸外科长沙市410011 中南大学湘雅二医院护理部长沙市410011 中南大学湘雅二医院心脏大血管外科长沙市410011

目的:探讨护士专职夜班岗位设置与管理的实践效果及体会。方法:于2012年6月起在中南大学湘雅二医院胸外科、心脏大血管外科和骨科4个病区试点护士专职夜班岗位,比较实施前后患者对护理服务满意度、护士对工作满意度、夜班护理质量的变... 详细信息

目的:探讨护士专职夜班岗位设置与管理的实践效果及体会。方法:于2012年6月起在中南大学湘雅二医院胸外科、心脏大血管外科和骨科4个病区试点护士专职夜班岗位,比较实施前后患者对护理服务满意度、护士对工作满意度、夜班护理质量的变化。结果:实施护士专职夜班岗位后患者对护理服务满意度、护士工作满意度均明显提升(P<0.05),夜班护理质量提升。结论:建立在岗位管理基础上的护士夜班岗位管理,能够提高护理管理效能和护理服务满意度,促进责任制整体护理的深入开展。

关键词：护士专职夜班岗位管理

医院心理援助热线接线员的志愿动机与应对方式现状及相关性分析

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现代临床医学 2024年第2期50卷 85-88,92页

作者：张霞彭斯崔大磊刘娟苏喜美欧阳莎媛肖涛李乐之湖南中医药大学护理学院/中南大学湘雅二医院临床护理学教研室湖南长沙410000

目的:调查医院心理援助热线接线员的志愿动机与应对方式现状并分析二者相关性。方法:2022年11月一12月,选取湖南省某三甲医院的118名心理援助热线接线员为研究对象,采用志愿动机量表、特质应对方式问卷进行调查,并对结果进行相关性分析... 详细信息

目的:调查医院心理援助热线接线员的志愿动机与应对方式现状并分析二者相关性。方法:2022年11月一12月,选取湖南省某三甲医院的118名心理援助热线接线员为研究对象,采用志愿动机量表、特质应对方式问卷进行调查,并对结果进行相关性分析。结果:回收有效问卷102份,102名医院心理援助热线接线员志愿动机总分为(5.87±0.63)分。不同生育状况接线员的学习理解、自我增强得分比较差异有统计学意义,不同工作年限接线员的自我保护得分比较差异有统计学意义,不同科室接线员的职业生涯得分比较差异有统计学意义(均P<0.05)。积极应对与志愿动机总分呈正相关(r=0.560,P<0.01),消极应对与志愿动机总分呈负相关(r=-0.308,P<0.05)。结论:医院心理援助热线接线员参与志愿服务的动机多样化,且志愿动机与积极应对方式呈正相关,增强接线员的积极应对有利于提高其志愿动机。

关键词：心理援助热线志愿动机应对方式接线员