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热轧镁/铝复合板的组织演变与拉伸性能研究 被引量:4
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作者 BASHIR Muhammad Umar 李莎 +3 位作者 刘志栋 REHMAN Atta Ur ali usman 王涛 《热加工工艺》 北大核心 2023年第14期71-75,共5页
在不同压下率(40%、45%和50%)条件下采用普通平辊热轧技术制备了镁/铝复合板,并对50%压下率下制备得到的复合板进行了不同温度的退火处理,分析了不同压下率和不同退火温度对界面组织和拉伸性能的影响。结果表明,单道次轧制后,未经退火... 在不同压下率(40%、45%和50%)条件下采用普通平辊热轧技术制备了镁/铝复合板,并对50%压下率下制备得到的复合板进行了不同温度的退火处理,分析了不同压下率和不同退火温度对界面组织和拉伸性能的影响。结果表明,单道次轧制后,未经退火处理时,镁/铝复合板界面结合良好,无裂纹、金属间化合物出现。随着轧制压下率的增加,轧制态试样的抗拉强度提高。当压下率为50%时,最大抗拉强度为278 MPa。在50%的压下率下,随着退火温度的升高,镁/铝复合板的金属间化合物厚度增加。但是随着退火温度的升高,抗拉强度降低,当退火温度为350℃时,抗拉强度最低为220 MPa。 展开更多
关键词 镁/铝复合板 普通平辊 压下率 退火温度 拉伸性能
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高原缺氧的大尺度脑网络分析
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作者 柳倩 柴洁玮 +7 位作者 樊泽泽 霍炯宇 姚蓉 ali usman 张来福 王志鹏 韦新 李海芳 《太原理工大学学报》 CAS 北大核心 2020年第4期530-534,共5页
针对目前高原数据的处理局限于提取脑电(electroencephalogram,EEG)信号的节律、能量值等一些简单特征值的缺陷,本文将大脑看作一个相互联系的网络,将节律、能量与大尺度脑网络相结合,从一种全新的角度探讨缺氧给大脑带来的损伤。分别... 针对目前高原数据的处理局限于提取脑电(electroencephalogram,EEG)信号的节律、能量值等一些简单特征值的缺陷,本文将大脑看作一个相互联系的网络,将节律、能量与大尺度脑网络相结合,从一种全新的角度探讨缺氧给大脑带来的损伤。分别对移居海拔400,2890,3600,4500 m两年的居住者进行了相关研究。根据静息态EEG信号估计头皮能量,并采用基于网络的源定位技术获得7种节律下的皮层电流密度,根据每个网络覆盖的区域求得8个大尺度脑网络的能量值,最后对不同海拔的大尺度脑网络能量进行单因素方差分析。实验结果表明,不同海拔之间大尺度脑网络存在显著差异,主要表现在:θ、α1、β1和β2节律下海拔4500 m组深部结构脑网络能量显著降低;α1和β2节律下的视觉网络、边缘系统,以及α1节律下的默认网络都表现为海拔3600 m组的脑网络能量显著升高,海拔4500 m组的脑网络能量显著降低;同时发现随着海拔的升高能量值有上升趋势,但是最高海拔能量值却为最低,因此推测海拔高度对人脑影响有一个阈值的存在。为缺氧导致的大脑损伤研究提供了新的思路。 展开更多
关键词 高原缺氧 静息态脑电 大尺度脑网络 能量
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Stalking of Healthcare Professionals by Their Clients: The Prevalence, Motivation, and Effect
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作者 Sefa Bulut ali Cissy usman Thseen Nazir 《Open Journal of Medical Psychology》 2021年第2期27-35,共9页
It is proposed that healthcare professionals are prone to be stalked by their patients, but many feel ashamed to talk about it, believing that they might have done something to warrant the stalking. We undertook a rig... It is proposed that healthcare professionals are prone to be stalked by their patients, but many feel ashamed to talk about it, believing that they might have done something to warrant the stalking. We undertook a rigorous review of the literature with the primitive goal of highlighting noteworthy issues on the stalking of healthcare professionals and psychologists by their patients. Databases such as PubMed and Google Scholar were searched to collate articles and studies on the topic with the keywords “stalker, stalking, assaults, aggression, and physicians”. From the review, the prevalence rate of stalking healthcare professionals ranged between 6%</span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">53%. This huge variation was largely due to the inconsistencies in the definition of what constituted stalking. The common motives of stalkers were largely due to erotomania or misguided expectation and a sense of resentment due to service dissatisfaction. Finally, it was apparently right to conclude that, medical doctors or healthcare professionals are at risk of being stalked on the grounds of service dissatisfaction, and mismanagement of treatment processes resulting in physical or perceived client injuries. Whereas psychologists and other psychiatrists are more prone to be stalked due to erotomaniac reasons. 展开更多
关键词 Stalking Erotomania Misguided Expectation RESENTMENT Healthcare Professionals
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