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Modulation of the thermal transport of micro-structured materials from 3D printing

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International Journal of Extreme Manufacturing 2022年第1期4卷 22-33页

作者： qiangsheng sun Zhixiang Xue Yang Chen Ruding Xia Jianmei Wang Shen Xu Jun Zhang Yanan Yue School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072People’s Republic of China School of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620People’s Repub

It is desirable to fabricate materials with adjustable physical properties that can be used in different industrial *** the property of a material is highly dependent on its inner structure,the understanding of structure–property correlation is critical to the design of engineering materials.3D printing appears as a mature method to effectively produce micro-structured *** this work,we created different stainless-steel microstructures by adjusting the speed of 3D printing and studied the relationship between thermal property and printing *** microstructure study demonstrates that highly porous structures appear at higher speeds,and there is a nearly linear relationship between porosity and printing *** thermal conductivity of samples fabricated by different printing speeds is ***,the correlation between porosity,thermal conductivity,and scanning speed is *** on this correlation,the thermal conductivity of a sample can be predicted from its printing *** fabricated a new sample at a different speed,and the thermal conductivity measurement agrees well with the value predicted from the *** explore thermal transport physics,the effects of pore structure and temperature on the thermal performance of the printed block are also *** work demonstrates that the combination of the 3D printing technique and the printing speed control can regulate the thermophysical properties of materials.

关键词： modulation thermal property microstructure 3D printing speed

Enantioselective epoxidation of olefins with hydrogen peroxide catalyzed by bioinspired aminopyridine manganese complexes derived from L-proline

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Chinese Journal of Catalysis 2018年第9期39卷 1463-1469页

作者： Wenfang Wang qiangsheng sun Chungu Xia Wei sun State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 Gansu China University of Chinese Academy of Sciences Beijing 100049 China

Three chiral aminopyridine ligands derived from L-proline were prepared. Careful evaluation of the corresponding aminopyridine manganese complexes in asymmetric epoxidation of olefins revealed a broad substrate scope in the presence of 0.2 mol% manganese complex and 0.5 equiv. 2,2-dimethylbutyric acid, with aqueous hydrogen peroxide as an oxidant. A variety of olefins including styrenes, chromenes, and cinnamamides were transformed successfully into the target epoxides with moderate to excellent enantioselectivity（yield up to 95%, ee up to 99%）.

关键词： Aminopyridine ligand Manganese Asymmetricep oxidation Hydrogenperoxide Olefin

仿生金属配合物催化的C(sp^3)-H键不对称氧化反应研究进展

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有机化学 2020年第11期40卷 3686-3696,M0008页

作者：孙强盛孙伟中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室分子合成科学卓越创新中心兰州730000

C-H氧化反应是一类重要的有机反应,其中C-H不对称氧化反应可以将简单烃类化合物直接转化为手性醇和酮等,为复杂分子的合成提供了更加经济和高效的方法.尽管在过去的数十年,很多化学家致力于不对称C-H氧化反应研究,但由于C-H键本身的惰性... 详细信息

C-H氧化反应是一类重要的有机反应,其中C-H不对称氧化反应可以将简单烃类化合物直接转化为手性醇和酮等,为复杂分子的合成提供了更加经济和高效的方法.尽管在过去的数十年,很多化学家致力于不对称C-H氧化反应研究,但由于C-H键本身的惰性和C-H键之间微弱的立体性差异,该研究领域的进展依然缓慢.结合影响C-H氧化反应的因素、生物酶催化氧化机制与仿生金属配合物催化剂的发展,从配体类型的角度阐述当前所实现的C-H键不对称氧化的一些反应实例.

关键词： C-H氧化金属配合物不对称氧化

Effects of Mouse Thatched on Soil Temperature, Yield and Quality in Apple Orchard

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Agricultural Biotechnology 2019年第3期8卷 153-155,158页

作者： Yanhong LI Na LI Peiping ZHANG qiangsheng sun Yao sun Hongzhang WANG Soil and Fertilizer Station of Yantai Agricultural Technology Extension Center Yantai 264000China Zhucheng Agricultural Technology Extension Service Center Weifang 262200China

[Objectives]This study was conducted to study the effect of mouse thatched on soil temperature,yield and quality in orchards.[Methods]The response of orchard soil,yield and quality to sod culture was studied by comparisons of grassing for two years,three years and clean cultivation.[Results]In April,the soil temperature in mouse thatched area was higher than that in clean cultivation area,and the temperature in the three years of sward was the *** May to July,the temperature in mouse thatched area was lower than that in clean cultivation area,and the temperature was lowest in the three years of *** the same time,the fruit yield and quality were *** the two years,the yield of apple increased by 12%,and the contents of sugar,soluble solids and vitamin C and the firmness of the fruit were increased,and the total acid content was decreased by planting mouse thatched.[Conclusions]Adjusting soil temperature in orchards by planting grass achieved the effects of promoting the activity of microorganisms,facilitating the growth of root system,increasing the yield and improving the quality.

关键词： Apple orchard Mouse thatched Soil temperature Yield Quality

手性Mn(Ⅲ)-Salen配合物催化的2-芳基环烷醇的高对映选择性氧化动力学拆分

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中国科学：化学 2018年第12期48卷 1619-1626页

作者：徐大乾孙强盛夏春谷孙伟中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室兰州730000

本文发展了一种通过氧化动力学拆分获得光学活性2-芳基环烷醇的方法:该体系以N-溴代丁二酰亚胺为氧化剂,简单易得的手性Mn(Ⅲ)-salen配合物(0.5 mol%)为催化剂.该方法底物适用性广、具有高度的立体控制且易于进行克级规模的反应,为光学... 详细信息

本文发展了一种通过氧化动力学拆分获得光学活性2-芳基环烷醇的方法:该体系以N-溴代丁二酰亚胺为氧化剂,简单易得的手性Mn(Ⅲ)-salen配合物(0.5 mol%)为催化剂.该方法底物适用性广、具有高度的立体控制且易于进行克级规模的反应,为光学活性2-芳基环烷醇类化合物的合成提供了一种高效、实用的方法.

关键词： Mn(Ⅲ)-salen配合物氧化动力学拆分 2-芳基环烷醇 N-溴代丁二酰亚胺

Effect of Room Temperature Ultrasonic Vibration Compression on the Microstructure Evolution and Mechanical Properties of AZ91 Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1135-1146页

作者： Ziyue Xu Huan Liu Luyao Li Chao sun Xi Tan Baishan Chen qiangsheng Dong Yuna Wu Jinghua Jiang Jiang Ma College of Materials Science and Engineering Hohai UniversityNanjing210000China Suzhou Research Institute of Hohai University Suzhou215000China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Institute of Medical Devices(Suzhou) Southeast UniversitySuzhou215163China Institute for Advanced Study Central South UniversityChangsha410083China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing211167China

To investigate the potential of direct ultrasonic vibration on improving the performance of magnesium alloys,this study first employed the ultrasonic vibration compression(UVC)on the solid solution treated AZ91 alloy,and explored its microstructure evolution and mechanical properties under *** only two seconds,the UVC alloys showed large deformation strains of 34.8–54.4%,and sudden increase of sample temperature to 243℃.Microstructure characterizations proved that UVC promoted the formation of abundant shear bands,fine grains,and the bimodal distribution of Mg17Al12 precipitates consisting of submicron particles located within the shear bands and nano-sized ones within the *** to the unique microstructure,the micro-hardness(and nano-hardness)value of UVC alloy was increased by 37.7%(35%)when compared with the solution-treated ***,the nano-modulus of the developed AZ91 alloy was also significantly increased to 62 GPa by statistical nanoindentation tests,which could be ascribed to increased Mg_(17)Al_(12) precipitates and decreased c/a value to some *** general,this work provides a new insight into the design and preparation of high-performance magnesium alloys by UVC at room temperature.

关键词： AZ91 alloys Ultrasonic vibration compression Precipitation Shear bands Mechanical properties

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隧道水性防污涂料研发及应用

中国建材科技 2022年第2期31卷 85-89页

作者：魏小龙丁攀许辉吴祥海张强侯孝斌孙强盛陈鹏任国斌张青武旭郝金迎甘肃省交通规划勘察设计院股份有限公司甘肃兰州730010 甘肃省兰州公路事业发展中心甘肃兰州730010 云上甘肃科技有限公司甘肃兰州730000 甘肃省公路事业发展中心甘肃兰州730010 陕西中盛道路养护工程技术有限公司陕西西安710075

针对当前隧道内墙装饰材料耐污性差、影响行车安全的问题,研发了一款水性防污涂料,阐述了其工艺配方,并对其漆膜性能进行性能研究。结果表明,水性防污涂料的各项性能均满足指标要求,耐污性能达到1级标准,阻燃性达到B1级,产烟毒性满足ZA... 详细信息

针对当前隧道内墙装饰材料耐污性差、影响行车安全的问题,研发了一款水性防污涂料,阐述了其工艺配方,并对其漆膜性能进行性能研究。结果表明,水性防污涂料的各项性能均满足指标要求,耐污性能达到1级标准,阻燃性达到B1级,产烟毒性满足ZA3级标准要求,是一款性能优良的隧道内墙涂料。

关键词：防污涂料水性涂料隧道工程

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高压输电铁塔有限元模型的环境灵敏度分析

应用基础与工程科学学报 2015年第4期23卷 805-814页

作者：刘春城徐强胜孙铭东北电力大学建筑工程学院吉林吉林132012 国网辽宁省电力有限公司经济技术研究院辽宁沈阳110015

基于随机响应面法建立了高压输电铁塔灵敏度分析模型.利用BoxBehnken设计法,选取风速和覆冰厚度作为灵敏度参数,用随机响应面法将其隐式的灵敏度响应函数转换成显式函数,利用有限元计算结果验证所得显示函数正确性,并得到风速、覆冰厚... 详细信息

基于随机响应面法建立了高压输电铁塔灵敏度分析模型.利用BoxBehnken设计法,选取风速和覆冰厚度作为灵敏度参数,用随机响应面法将其隐式的灵敏度响应函数转换成显式函数,利用有限元计算结果验证所得显示函数正确性,并得到风速、覆冰厚度对输电铁塔不同位置的响应面图,可以直观分析出灵敏度及其变化.利用得到的显示函数,可以数值化风速及覆冰厚度对输电铁塔的影响率及变化率.证明响应面法在输电铁塔有限元模型灵敏度分析方面的应用价值,为以后更多交叉响应参数的灵敏度计算提供参考.

关键词： Box-Behnken响应面法灵敏度风速覆冰厚度参数影响率

IEC 61850控制模型一致性测试的工程应用探讨

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电力系统自动化 2020年第15期44卷 180-183页

作者：王珍珍孙丹温树峰王永福卜强生国网电力科学研究院有限公司江苏省南京市211106 智能电网保护和运行控制国家重点实验室江苏省南京市211106 国家电网有限公司电力调度控制中心北京市100031 国网江苏省电力有限公司电力科学研究院江苏省南京市211103

首先结合标准对IEC 61850控制模型的定义和实现进行研究,对比了实际应用与标准定义,说明了对其测试的必要性;其次将IEC 61850-7-2和IEC 61850-8-1第2版中控制模型部分内容与第1版进行分析比对;然后着重分析IEC 61850-10第2版相对于第1... 详细信息

首先结合标准对IEC 61850控制模型的定义和实现进行研究,对比了实际应用与标准定义,说明了对其测试的必要性;其次将IEC 61850-7-2和IEC 61850-8-1第2版中控制模型部分内容与第1版进行分析比对;然后着重分析IEC 61850-10第2版相对于第1版有较大差异的测试用例,剖析测试的新要点;最后通过工程应用中的探索,针对典型问题,讨论了相关测试要求及解决方案。

关键词： IEC 61850 一致性测试控制模型版本对比