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垂直氮化镓沟槽栅极场效应管的优化设计

固体电子学研究与进展 2024年第1期44卷 19-23页

作者：杨华恺刘新科姜梅何仕杰贺威深圳大学电子与信息工程学院广东深圳518060

在传统的氮化镓沟槽栅极场效应管的基础上,通过引入AlGaN层,在异质结界面处形成二维电子气减小器件的导通电阻,并对漂移层的厚度和掺杂浓度进行讨论,使用TCAD软件对器件进行设计优化。最终优化后的漂移层厚度为6μm,掺杂浓度为5×10^(16... 详细信息

在传统的氮化镓沟槽栅极场效应管的基础上,通过引入AlGaN层,在异质结界面处形成二维电子气减小器件的导通电阻,并对漂移层的厚度和掺杂浓度进行讨论,使用TCAD软件对器件进行设计优化。最终优化后的漂移层厚度为6μm,掺杂浓度为5×10^(16)cm^(-3)。器件获得了较低的导通电阻R_(on)=0.47 mΩ·cm^(2),较高的击穿电压V_(BR)=2880 V和品质因子FOM=17.6 GW·cm^(-2)。结果显示出了沟槽栅极垂直氮化镓场效应管在高压大电流应用场景下的优势。

关键词：氮化镓沟槽栅极场效应晶体管 Baliga品质因子击穿电压导通电阻

Mechanical force drives the polarization and orientation of cells

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Acta Mechanica Sinica 2019年第2期35卷 275-288页

作者： shijie he Xiaomeng Li Baohua Ji Center for Engineering in Medicine Massachusetts General Hospital Harvard Medical School Boston MA 02114 USA Department of Applied Mechanics School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China Department of Engineering Mechanics Zhejiang University Hangzhou 310027 China

Collective cells are organized to form specific patterns which play important roles in various physiological and pathological processes, such as tissue morphogenesis, wound healing, and cancer invasion. Compared to single cell behaviors, which has been intensively studied from many aspects (cell migration, adhesion, polarization, proliferation, etc.) and at various scales (molecular, subcellular, and cellular), the multiple cell behaviors are relatively less understood, particularly in a quantitative manner. In this paper, we will present our recent studies of collective polarization and orientation of multiple cells through both experimental measurement and theoretical modeling, including those cell behaviors on/in 2D and 3D substrate/tissue. We find that the collective cell behaviors, including polarization, alignment and migration are closely related to local stress states in cell layer or tissue, which demonstrate the crucial roles of mechanical forces in the living organisms. Specifically, the cells prefer to polarize and align along the maximum principal stress in the cell layer, and the aspect ratio of cell increases with the in-plane maximum shear stress, suggesting that the maximum shear stress is the underlying driving force of cell polarization and orientation. This theory of stress-driven cell behaviors of polarization and orientation provides a new perspective for understanding cell behaviors in living organisms and the guideline for tissue engineering in biomedical applications.

关键词： Collective cell behaviors Cell polarization Cell alignment Quantification Cell mechanosensing

四川盆地长宁地区龙马溪组页岩气运移主控因素

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天然气地球科学 2024年第7期35卷 1223-1235页

作者：王国臻姜振学张原豪陈瑞华宫厚健贺世杰中国石油大学(北京)非常规油气科学技术研究院北京102249 中国石油新疆油田公司勘探开发研究院新疆克拉玛依834000 中国石油大学(北京)油气资源与探测国家重点实验室北京102249 中国石油大学(北京)地球科学学院北京102249

页岩气的运移是页岩气富集过程中十分重要的地质作用,计算流体力学方法可研究页岩气运移现象。基于计算流体动力学原理,建立了包含地层倾角与物性要素的抽象物理模型,采用控制变量法查明了其对气体运移的控制作用;以四川盆地长宁地区典... 详细信息

页岩气的运移是页岩气富集过程中十分重要的地质作用,计算流体力学方法可研究页岩气运移现象。基于计算流体动力学原理,建立了包含地层倾角与物性要素的抽象物理模型,采用控制变量法查明了其对气体运移的控制作用;以四川盆地长宁地区典型页岩气藏剖面为研究对象,推导了实际地质条件下的页岩气藏古压力、古含气量演化数学方程,并将方程计算结果作为初始条件,采用流体动力学方法模拟了页岩气藏宏观动态演化过程。研究结果表明:地层倾角控制了层理面受到的正应力与顺层方向的气体压力梯度,地层倾角越大,地层层面上所受的压实越弱,顺层面方向上压力梯度就越大,气体运移能力就越强;气体在运移过程中总是沿着物性优势通道运移,通道与围岩物性级差越大,控制油气运移的作用就越强;长宁背斜页岩气运移主要受控于地层抬升,导致垂向扩散量相对较少,低部位气藏对高部位有侧向运移补给;天宫堂末次构造早期正断层活动导致下倾方向渗流损失较大,尽管后期逆断层抑制了垂向扩散损失,但气藏含气量仍然较低。

关键词：长宁地区龙马溪组页岩气运移 CFD模拟

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热电制冷/热泵教学实验装置的研制

实验室研究与探索 2024年第7期43卷 54-58页

作者：幸文婷朱赤叶晓明吴杰俊何诗洁华中科技大学能源与动力工程实验教学中心武汉430074

为了让学生掌握热电制冷的工作原理及研究应用,研制了热电制冷/热泵实验装置用于本科实验教学。该实验装置在能量利用方面可实现一系列能量的存储与转换;在制冷/供热形式方面可实现供冷(热)水及冷(热)风功能;在热端散热方式方面可实现... 详细信息

为了让学生掌握热电制冷的工作原理及研究应用,研制了热电制冷/热泵实验装置用于本科实验教学。该实验装置在能量利用方面可实现一系列能量的存储与转换;在制冷/供热形式方面可实现供冷(热)水及冷(热)风功能;在热端散热方式方面可实现自然对流散热、水冷散热及强制风冷散热或水冷加风冷组合散热模式。同时,该实验装置可进行现象演示及散热器端/散冷器端自然对流、强制对流热电性能、冷却水流量及输入电压对热电性能的影响和太阳能光伏发电系统对热电性能影响的研究。

关键词：热电制冷热泵性能

5种杀菌剂对红麻炭疽病防效及红麻产量的影响

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扬州大学学报（农业与生命科学版） 2024年第4期45卷 130-136页

作者：杨光何世界张丽霞史鹏飞刘耀潘兹亮信阳市农业科学院/农业农村部信阳作物有害生物科学观测实验站/河南省信阳作物有害生物野外科学观测研究站河南信阳464000

为筛选防治红麻炭疽病的高效杀菌剂,采用生长速率法和凹玻片法室内测定5种杀菌剂对红麻炭疽病菌菌丝生长和孢子萌发的毒力,选择其中3种效果较好的药剂进行田间药效试验。结果表明:咪鲜胺、吡唑醚酯和苯醚甲环唑对红麻炭疽病菌菌丝生长... 详细信息

为筛选防治红麻炭疽病的高效杀菌剂,采用生长速率法和凹玻片法室内测定5种杀菌剂对红麻炭疽病菌菌丝生长和孢子萌发的毒力,选择其中3种效果较好的药剂进行田间药效试验。结果表明:咪鲜胺、吡唑醚酯和苯醚甲环唑对红麻炭疽病菌菌丝生长和孢子萌发的抑制效果较好,菌丝的EC50分别为0.0880、0.1205和0.5136μg·mL^(-1),孢子萌发的EC50分别为0.1230、0.1658和0.8987μg·mL^(-1)。以25%咪鲜胺乳油900 mL·hm^(-2)剂量(用水量为450 kg·hm^(-2))对红麻叶面进行喷施,对红麻炭疽病田间防效达94.34%,且使红麻单株纤维重较对照显著增加15.92%。这一研究可为红麻炭疽病的防治提供参考。

关键词：红麻炭疽病杀菌剂毒力测定田间防治

Evaluation of diagnostic ratios of medium and serious weathered oils from five different oil sources

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Acta Oceanologica Sinica 2016年第4期35卷 1-8页

作者： he shijie WANG Chuanyuan LI Yantai YU Hongjun HAN Bin School of Resources and Environmental Engineering Ludong University Yantai 264025 China Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Public Administration Shandong Economic University Jinan 250014 China First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

Laboratory experiments were conducted to simulate oil weathering process, a medium to long term weathering process for 210-d, using samples collected from five different oil resources. Based on relative deviation and repeatability limit analysis about indexes of these samples, the results show there had been significant changes in diagnostic ratios among the initial and weathered samples of different oils during this process. Changes of selected n-alkane diagnostic ratios of all oil samples displayed more obviously than diagnostic ratios of terpanes,steranes and PAHs in this process. Almost all selected diagnostic ratios of terpanes, steranes and PAHs can be efficiently used in tracking sources of hydrocarbon pollution, differentiating from the n-alkane diagnostic *** these efficient diagnostic ratios, only four ratios maintained good stability in the weathering processes and are more suitable because their relative deviation（RSD） are lower than 5%.

关键词： identification of spilled oils medium to long term weathering process simulation experiment biomarker ratios

Source diagnostic and weathering indicators of oil spills utilizing bicyclic sesquiterpanes

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Acta Oceanologica Sinica 2013年第8期32卷 79-84页

作者： WANG Chuanyuan HU Xiaoke he shijie LIU Xin ZHAO Mingming Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone Research Chinese Academy of Sciences College of Geography and Planning Ludong University

Bicyclic Sesquiterpanes （BSs） are ubiquitous components of crude oils and ancient sediments. BSs in crude oils and diesel oil were identified and characterized, the effects of moderate weathering on BS distributions were discussed, and a methodology using diagnostic indices of BSs was developed for oil correlation and dif- ferentiation. The results showed that crude oils and oil products had different abundances and distributions of BSs and, consequently, resulted in different diagnostic ratios. The selected diagnostic ratio indices of BSs, such as BS4/BS5 （ratio of 4,4,8,9,9-pentamethyl-decahydronaphthalene to 8/3 （H）-drimane）, BS6/BS5 （ratio of 4,4,9,9,10-pentamethyl-decahydronaphthalene to 8/3 （H）-drimane）, BS8/BS9 （ratio of the second peak to the third peak of C16 sequiterpane）, and BS8/BSIO （ratio of C16 sequiterpane to 8fl （H）-homodrimane）, still maintained better stabilities （%RSD 〈 5%） after weathering for 30 d. The longer weathering process （150 d） had some effect on such ratios （5% 〈 %RSD 〈 10%）. The facts of the uniqueness, abundance in petroleum, and chemical stability of BSs enable them to be suitable as an effective diagnostic means for identifying spilled oil with moderate weathering, particularly for lighter refined product samples that are difficult to identify by current techniques.

关键词： bicyclic sesquiterpanes distribution diagnostic indices weathering oil spill source identifica-tion

Cell traction force distribution and its implications in cell adhesion and migration

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医用生物力学 2013年第S1期28卷 33-35页

作者： shijie he Yewang Su Baohua Ji Biomechanics and Biomaterials Lab School of Aerospace EngineeringBeijing Institute of Technology Departments of Civil and Environmental Engineering and Mechanical Engineering Northwestern University

Cell-matrix interaction is the key for understanding the cell behaviors,especially the mechanosensitivity of cell adhesion,cell migration and differentiation,*** are constantly probing,pushing and pulling on the surrounding extracellular *** cell-generated forces drive cell migration and tissue morphogenesis,and maintain the intrinsic mechanical tone of ***,knowledge of the spatial and temporal nature of these forces are essential to understanding when and where mechanical events come to play in both physiological and pathological ***,because of the complexity of cell geometry and insufficient

关键词： migration traction constantly physiological maintain surrounding intrinsic probing insufficient periphery

Research progress on electrolyte key salts for sodium-ion batteries

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Progress in Natural Science:Materials International 2024年第02期34卷 263-273页

作者： weimin Zhao Miao Wang Haichen Lin Kangwoon Kim Rongkai he shijie Feng Haodong Liu College of Chemical Engineering and Safety Binzhou University Center for Memory and Recording Research Building University of California San Diego STATE GRID Liaocheng Power Supply Company

Sodium-ion batteries(SIBs) are considered potential successors to lithium-ion batteries in the fields of energy storage and low-speed vehicles, thanks to their advantages such as abundant raw material sources, high energy density, and a wide operational temperature range. However, several scientific and engineering challenges still require attention in the development of sodium-ion batteries. Electrolyte salts, as a key component of sodium-ion battery electrolytes, play a critical role in battery performance. This paper provides a brief overview of the research progress on different electrolyte salt systems in sodium-ion batteries. It discusses characteristics such as ionic conductivity, electrochemical windows, electrochemical performance, and thermal safety in various solvent systems. Furthermore, the paper summarizes a series of strategies for controlling electrolyte and electrode interfaces, offering references for addressing the challenges in the mass production and application of sodium-ion batteries.

关键词： Sodium ion batteries Electrolyte Electrolyte salts Electrochemical performance