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Surface hardening of Fe-based alloy powders by Nd:YAG laser cladding followed by electrospark deposition with WC-Co cemented carbide

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Rare Metals 2010年第4期29卷 380-384页

作者： WANG Jiansheng,MENG huimin,yu Hongying,FAN Zishuan,and SUN Dongbai School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China School of Materials Science and Engineering University of Science and Technology Beijing Beijing China

This paper presents the results of a study concerned with the surface hardening of Fe-based alloys and WC-8Co cemented carbide by inte- grating laser cladding and the electrospark deposition processes. Specimens of low carbon steel were processed firstly by laser cladding with Fe-based alloy powders and then by electrospark deposition with WC-SCo cemented carbide. It is shown that, for these two treatments, the electrospark coating possesses finer microstructure than the laser coating, and the thickness and surface hardness of the electrospark coating can be substantially increased.

关键词： laser cladding electrospark deposition surface hardening Fe-based alloy cemented carbide

Galvanic effects on cavitation damage for 1Cr13 stainless steel

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Journal of University of Science and Technology Beijing 2003年第4期10卷 33-37页

作者： Dongbai Sun, Xia Bai, Hongying yu, huimin Meng, and Huiqing LiUNDP-Beijing Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China UNDP Corrosion Ctr. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Based on the electric-spark principle, a new kind of cavitation damagetesting apparatus was designed, which could produce the bubble. Bubbles collapsed and acted on asmall surface area of the alloy surface, so an intensive electrochemical inhomogenous state would beinduced and lead to the existence of surface galvanic effect on the alloy. The galvanic effect of1Cr13 SS during cavitation damage has been quantitatively investigated in NaCl solution. The resultsshow that intensive galvanic effect of 1Cr13 SS during cavitation damage appears the potential ofthe damaged area shifting negatively with the bubble collapse and simultaneously the galvaniccurrent generates. The mass loss of alloy due to cavitation increases with the bubble quantity, andincreases with the increasing of Cl- content. And both the total mass loss and the mass loss due togalvanic corrosion increase linearly with the area ratio of cavitation damaged to undamaged *** surface galvanic effects speed up the dissolution rate of the alloy, which, in turn,accelerates the mechanical damage, and aggravates the mass loss of the alloy. It has been furtherconfirmed that the mass loss due to the surface galvanic effect can be decreased by catholicprotection.

关键词： cavitation damage galvanic effect area ratio mass loss

The Relationship Between Job Satisfaction and Employee Performance of Teacher in N University, China

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Psychology Research 2022年第6期12卷 398-409页

作者： yu huimin Taien Layraman Payap University Chiang MaiThailand

At present,as of June 15,2019,the Ministry of Education announced a total of 2,956 institutions of higher learning in China,including 2,688 regular institutions of higher learning(including 266 independent colleges)and 268 adult institutions of higher *** present,the development of colleges and universities is also facing serious *** the development and progress of the times,many colleges and universities are getting better and better,which is closely related to the teachers’strength and teachers’job *** is very important to improve the job satisfaction of university *** introduction of teachers is crucial,and many schools are weak in teaching staff,which hinders the long-term development of *** turnover of teachers in colleges and universities is closely related to job *** present,the overall turnover of teachers in colleges and universities is too *** rapid development of China’s colleges and universities is still expanding the scale of development,which requires more *** the ensuing enterprise competition,university positions are not dominant,mainly in the current life,salary is very important,family expenses,parents,and children’s expenses are getting higher and higher,but the salary of university teachers cannot keep up with the development of the *** present,one of the problems in colleges and universities is that salary promotion is not friendly to teachers with old qualifications,high academic qualifications,and high professional ***,to improve the job satisfaction of college teachers is the only way for the long-term development of colleges and *** study investigated the relationship between job satisfaction and employee performance among 341 teachers from N University in Nanning,Guangxi province,*** independent variable is six factors of job satisfaction,including working environment,salary and promotion,job security,relationship with colleagues,r

关键词： employee performance job satisfaction N the university correlation

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国际EPC热轧工程中MDR的应用

一重技术 2024年第4期 73-74,35,28页

作者：王震赵晓辉余慧敏柴佐华王家兴西安重型技术有限责任公司陕西西安710018

以国际EPC热轧工程项目为例,详细介绍项目进度计划管理中MDR的实际应用,重点探讨在大型项目设计阶段进度计划管理实施方面的一些方法和经验;指出国际项目必须精细化、精准化、可量化管理,为类似国际工程项目提供经验,以进一步提高企业... 详细信息

以国际EPC热轧工程项目为例,详细介绍项目进度计划管理中MDR的实际应用,重点探讨在大型项目设计阶段进度计划管理实施方面的一些方法和经验;指出国际项目必须精细化、精准化、可量化管理,为类似国际工程项目提供经验,以进一步提高企业的国际竞争力。

关键词： EPC 热轧进度计划管理 MDR

脑卒中患者社会疏离感影响因素文献计量学分析

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中国初级卫生保健 2024年第2期38卷 34-37页

作者：于慧敏王伟刘静沈亦忱叶丽萍严非复旦大学公共卫生学院/国家卫生健康委员会卫生技术评估重点实验室上海200032 复旦大学附属闵行医院/上海市闵行区中心医院/复旦大学公共卫生学院闵行分院上海201199

目的:系统归纳影响脑卒中患者社会疏离感的因素,为采取针对性的干预措施提供参考,促进患者及早康复和回归社会。方法:利用计算机检索中英文文献数据库,检索时间为建库至2023年3月。由2名研究员独立筛选文献、提取资料和进行质量评价,归... 详细信息

目的:系统归纳影响脑卒中患者社会疏离感的因素,为采取针对性的干预措施提供参考,促进患者及早康复和回归社会。方法:利用计算机检索中英文文献数据库,检索时间为建库至2023年3月。由2名研究员独立筛选文献、提取资料和进行质量评价,归纳与总结纳入研究的基本情况与结果。结果:共纳入14项研究,涉及年龄、文化程度、抑郁、病耻感、社会支持、脑卒中史等29个影响因素,并将其归为个人因素、心理因素、社会因素及疾病因素4大类。结论:影响脑卒中社会疏离水平的主要因素有家庭月收入、病耻感、社会支持、脑卒中史,次要因素有居住地、抑郁、自我效能、心理弹性、症状负担、神经功能缺陷、日常生活活动能力、合并慢性病情况。其他尚存在争议的影响因素未来需开展更多高质量研究予以验证。

关键词：脑卒中社会疏离影响因素计量学分析

改良术中实时计划对125Ⅰ粒子治疗腰淋巴结转移癌的价值

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实用肿瘤杂志 2024年第2期39卷 160-165页

作者：刘泽洲梁岩松赵金鑫于慧敏张宏涛徐克李慧娟底学敏高贞王娟河北省肿瘤放射性粒子植入诊疗中心河北省放射性粒子近距离治疗研究所河北省人民医院肿瘤一科河北石家庄050051

目的探讨改良术中实时计划对CT引导125Ⅰ粒子植入治疗腰淋巴结转移癌的价值。方法选取2015年1月至2021年12月在河北省人民医院接受125Ⅰ粒子治疗的腰淋巴结转移癌患者26例。根据手术时长(0.05)。传统术中实时计划组术前和术后V150比较... 详细信息

目的探讨改良术中实时计划对CT引导125Ⅰ粒子植入治疗腰淋巴结转移癌的价值。方法选取2015年1月至2021年12月在河北省人民医院接受125Ⅰ粒子治疗的腰淋巴结转移癌患者26例。根据手术时长(0.05)。传统术中实时计划组术前和术后V150比较,差异具有统计学意义(P0.05)。两组V150差值百分比比较,差异具有统计学意义(P=0.035);其余各剂量参数差值百分比比较,差异均无统计学意义(均P>0.05)。改良术中实时计划组和传统术中实时计划组术后6个月有效率分别为76.9%(10/13)和46.2%(6/13;P=0.226)。两组均未出现腹膜炎和出血等并发症。结论改良术中实时计划提高粒子剂量分布的准确性,在一定程度上降低高剂量区范围,为125Ⅰ粒子治疗腰淋巴结转移癌的安全性提供保证。

关键词：肿瘤近距离治疗腰淋巴结转移 125Ⅰ粒子剂量疗效

Blowup of Solutions to the Non-Isentropic Compressible Euler Equations with Time-Dependent Damping and Vacuum

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Journal of Applied Mathematics and Physics 2023年第7期11卷 1881-1894页

作者： yuping Feng huimin yu Wanfang Shen Department of Mathematics Shandong Normal University Jinan China Shandong Key Laboratory of Blockchain Finance Shandong University of Finance and Economics Jinan China

This paper mainly studies the blowup phenomenon of solutions to the compressible Euler equations with general time-dependent damping for non-isentropic fluids in two and three space dimensions. When the initial data is assumed to be radially symmetric and the initial density contains vacuum, we obtain that classical solution, especially the density, will blow up on finite time. The results also reveal that damping can really delay the singularity formation.

关键词： Compressible Euler Equations Blowup General Time-Dependent Damping Vacuum

Deactivation Kinetics of Nitrile Hydratase in Free Resting Cells

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Chinese Journal of Chemical Engineering 2009年第5期17卷 822-828页

作者：孙旭东于慧敏沈忠耀 Department of Chemical Engineering Tsinghua University Beijing 100084 China

Nitrile hydratase (NHase) is an important industrial enzyme used for acrylamide production from *** deactivation kinetics of NHases in free resting cells of Rhodococcus *** presented based on a bi-steady state *** of hydration temperature,product concentration and substrate concentration on NHase deactivation were investigated experimentally and correlated with a first order deactivation *** results showed that the hydration temperature and product concentration were major factors governing the deactivation of NHases under substrate-feeding *** acrylamide concentration was higher than 250 g·L1,the deactivation of NHases became serious and the bi-steady state assumption was not *** the hydration temperature was controlled at a relatively higher level such as 28°C,the total deactivation rate constant was about 2.8-fold of that at 20°C.

关键词： nitrile hydratase deactivation kinetics free resting cell bi-steady state assumption total deactivation rate constant

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上海市基层爱国卫生服务现状调查研究

中国初级卫生保健 2024年第1期38卷 21-25页

作者：于慧敏刘梦婷王伟魏晓敏袁颖严非付朝伟复旦大学公共卫生学院/国家卫生健康委员会卫生技术评估重点实验室上海200032 上海市健康促进中心上海200040

目的:系统描述上海市基层爱国卫生服务现况,为改善上海市基层爱国卫生服务提出针对性建议。方法:采用随机整群抽样法,从上海市中心城区(A区和B区)和非中心城区(C区和D区)各抽取5个街道开展问卷调查。结果:纳入分析5038人,郊区居民感知... 详细信息

目的:系统描述上海市基层爱国卫生服务现况,为改善上海市基层爱国卫生服务提出针对性建议。方法:采用随机整群抽样法,从上海市中心城区(A区和B区)和非中心城区(C区和D区)各抽取5个街道开展问卷调查。结果:纳入分析5038人,郊区居民感知的“四害”(苍蝇、蚊子、老鼠、蟑螂)防治效果、相关卫生行为状况、场所卫生状况郊区均较城区差,郊区居民对近一年基层开展的爱国卫生相关服务表示满意的比例也低于城区;建成时间在10年以内的小区居民对相关卫生行为状况中随地吐痰现象、场所(周边环境、菜场或超市环境、背街小巷、工地附近、小区垃圾处置点、小饭店、小熟食店、小理发店等)卫生状况、近一年社区开展的爱国卫生相关服务表示满意的比例最低;小区建成时间在11~20年的居民反映“四害”防治效果、部分相关卫生行为状况(吸烟、乱扔垃圾、随地大小便、宠物粪便现象)比例最低;居民获取健康知识的渠道排序由高到低分别为新媒体、传统媒体、社区健康宣教栏、电子屏、社区健康教育咨询点或智慧小屋、亲友。结论:加强基层爱国卫生人才队伍建设,高效推进基层爱国卫生服务;完善爱国卫生法律法规,丰富健康教育活动,规范居民相关卫生行为;利用多种媒体深入宣传基层爱国卫生运动,提升居民对基层爱国卫生服务的满意度。

关键词：基层爱国卫生运动 “四害” 卫生行为场所卫生满意度