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Planar Hall Effect in the Charge-Density-Wave Bi_(2)Rh_(3)Se_(2)

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Chinese Physics Letters 2024年第7期41卷 126-131页

作者：蔡明桔陈正杨扬朱相德孙浩翔朱安康刘学韩玉岩高文帅田明亮 Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China Anhui Key Laboratory of Low-energy Quantum Materials and Devices High Magnetic Field LaboratoryHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Stony Brook Institute at Anhui University Anhui UniversityHefei 230601China School of Mathematics and Physics Bengbu UniversityBengbu 233030China School of Physics and Optoelectronics Engineering Anhui UniversityHefei 230601China

We systematically investigate in-plane transport properties of ternary chalcogenideBi_(2)Rh_(3)Se_(2).Upon rotating the magnetic field within the plane of the sample, one can distinctly detect the presence of both planar Hall resistance and anisotropic longitudinal resistance, and the phenomena appeared are precisely described by the theoretical formulation of the planar Hall effect (PHE). In addition, anisotropic orbital magnetoresistance rather than topologically nontrivial chiral anomalies dominates the PHE in Bi_(2)Rh_(3)Se_(2). The finding not only provides another platform for understanding the mechanism of PHE, but could also be beneficial for future planar Hall sensors based on two-dimensional materials.

关键词： materials planar anisotropic

Transport signatures of the topological surface state induced by the size effect in superconductor β-PdBi_(2)

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Science China(Physics,Mechanics & Astronomy) 2023年第7期66卷 94-101页

作者： ankang zhu Zheng Chen Yuyan Han Mengcheng zhu Huanhuan Wang Minglong Han Liang Li Xue Liu Guolin Zheng Xiangde zhu Wenshuai Gao Mingliang Tian Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230601China School of Physics and Optoelectronics Engineering Anhui UniversityHefei 230031China

The superconductivity and nontrivial topological electronic state are key hallmarks of topological ***,we focus on the transport signals of possible topological surface state in the topological superconductor candidate β-PdBi_(2) nanoflake with a thickness of 21 *** resistance demonstrates a semiconductor-metal transition followed by an upturned behavior as the temperature decreases.A large and unsaturated longitudinal magnetoresistance(MR),accompanied by distinct Shubnikov-de Hass oscillation in Hall resistance,is *** analysis of Hall resistance reveals that the carriers present the characteristics of relativistic particles with small effective mass and extremely high *** angle-dependent quantum oscillations demonstrate a two-dimensional Fermi surface topology.A giant anisotropic MR as large as 98%is detected when rotating the magnetic *** results provide the possible transport signals of a nontrivial topological electronic state,establishing a further understanding of the topological properties of the low-dimensional topological superconductor candidate β-PdBi_(2).

关键词： magnetotransport surface state low-dimensional

Embryonic skeleton development and neonatal learning and memory ability of rats anesthetized with pentobarbital sodium: Differences of administration occasion and time

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Neural Regeneration Research 2006年第9期1卷 844-846页

作者： Changling Peng Yuhua zhu ankang Hu Xiaorong zhu Experimental Animal Center Xuzhou Medical CollegeXuzhou 221002 Jiangsu Province China Experimental Animal CenterXuzhou Medical CollegeXuzhou 221002 Jiangsu Province China Experimental Animal CenterXuzhou Medical CollegeXuzhou 221002 Jiangsu Province China Experimental Animal CenterXuzhou Medical CollegeXuzhou 221002 Jiangsu Province China

BACKGROUND: Generally speaking, anesthesia is often used in gravid body and it has been already proved that many kind of medicine can result in malformation. OBJECTIVE: To explore embryonic skeleton development and neonatal learning and memory of rats anesthetized with pentobarbital sodium in gravid rats. DESIGN: A randomized control trial. SETTING: Laboratory Animal Center of Xuzhou Medical College. MATERIALS: A total of 80 adult female SD rats, of clean grade and weighing 220-240 g, were selected in this study. The main reagents were detailed as follows: pentobarbital sodium (Shanghai Xingzhi Chemical Plant, batch number: 921019); MG-2 maze test apparatus (Zhangjiagang Biomedical Instrument Factory); somatotype microscope (Beijing Taike Instrument Co., Ltd.). METHODS: ① A total of 160 SD rats of half males and females were selected in this study. All rats were copulated. The day that the plug was checked out in the vagina next day was looked as the first day of pregnancy. Gravid rats were divided randomly into four groups, including early anesthesia group, second anesthesia group, late anesthesia group and control group with 20 in each group. Rats in the early anesthesia group were injected with 25 mg/kg soluble pentobarbitone on the 7th day of pregnancy for once; rats in the second anesthesia group were anesthetized with 25 mg/kg soluble pentobarbitone on the 7th and the 14th days of pregnancy for once; rats in the late anesthesia group were anesthetized with 25 mg/kg soluble pentobarbitone on the 14th day of pregnancy for once; rats in the control group did not treat with anything. The time of anesthetizing was controlled in 3 to 4 hours and ether was absorbed while the time was not enough. ② Half of each group was sacrificed on day 20th of pregnancy and the fetus was taken out to be stained with alizarin red S. After stained, the fetal skeleton was examined. The learning and memorizing of one-month rats that were given birth by the rest gravid rats were tested

关键词： Embryonic skeleton development and neonatal learning and memory ability of rats anesthetized with pentobarbital sodium Differences of administration occasion and time

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基于深度学习的铝材表面缺陷检测系统设计

传感器与微系统 2022年第8期41卷 96-99,103页

作者：朱安康王娆芬张振宇上海工程技术大学电子电气工程学院上海201620

针对目前铝型材表面瑕疵检测系统检测效果差的问题,提出了一种基于深度学习的铝材表面缺陷检测系统。首先,适当改变主干网络的深度和通道数以提高模型鲁棒性,同时对改进后模型的超参数进行调整;然后增加使用可变形卷积,提高网络对不规... 详细信息

针对目前铝型材表面瑕疵检测系统检测效果差的问题,提出了一种基于深度学习的铝材表面缺陷检测系统。首先,适当改变主干网络的深度和通道数以提高模型鲁棒性,同时对改进后模型的超参数进行调整;然后增加使用可变形卷积,提高网络对不规则目标缺陷的检测能力。实验结果表明:对缺陷检测的平均准确率(mAP)较改进前提高6.5%,对角位漏底、起坑、漏底缺陷的检测精度分别提升25.7%,35.4%,33.5%。改进后系统模型的mAP较当前一系列性能优异的目标检测算法有显著提高。

关键词：深度学习 FasterRCNN 可变形卷积缺陷检测

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高压非穿通P-i-N二极管等离子体抽取渡越振荡集总电路模型及封装抑制方法研究

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中国电机工程学报 2023年第1期43卷 263-273页

作者：朱安康包鑫康陈宇周宇罗皓泽李武华何湘宁电力电子国家专业实验室(浙江大学) 浙江省杭州市310027

高压非穿通P-i-N二极管反向恢复阶段产生等离子抽取渡越时间(plasma extraction transit time,PETT)振荡,对功率模块的驱动电路和设备EMC性能造成严重干扰。文中根据二极管PETT振荡阶段载流子运行特征将器件内部分为等离子区、漂移区和... 详细信息

高压非穿通P-i-N二极管反向恢复阶段产生等离子抽取渡越时间(plasma extraction transit time,PETT)振荡,对功率模块的驱动电路和设备EMC性能造成严重干扰。文中根据二极管PETT振荡阶段载流子运行特征将器件内部分为等离子区、漂移区和无源区3个区域并将各区域等效成电阻、电感和电容等集总电路参数,利用二极管等效电路与外围电路参数构建了PETT振荡集总电路模型。该模型可计算得到振荡阶段回路各阻抗的动态变化,复现PETT振荡失稳–自稳振荡现象。该集总电路模型表明PETT振荡出现根本原因是回路出现负阻,而负阻出现的原因是空穴渡越角位于π~2π之间,基于该模型解析得到回路寄生电感的优化范围,通过优化封装布局的方式可将空穴渡越角移出负阻出现的区间。最后,在模块内部通过优化绑定线布局将回路寄生电感调整至优化范围内,从而避免回路负阻以抑制PETT振荡的出现,实验证明了该封装抑制方法的有效性。

关键词：焊接式模块非穿通P-i-N二极管等离子抽取渡越时间振荡集总电路模型封装抑制方法

基于换流–短路双回路解耦的SiC MOSFET功率器件抗短路封装构型设计

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中国电机工程学报 2023年第7期43卷 2781-2789页

作者：罗皓泽高洪艺朱安康金昱廷李武华何湘宁浙江大学电气工程学院浙江省杭州市310027

由于栅极氧化层可靠性差、短路电流密度大以及短路结温上升速率高,SiC MOSFET功率器件的短路耐受能力较弱,制约着其在电能变换领域的广泛应用。在此背景下,为了提升SiC MOSFET功率器件的短路耐受能力,文中基于换流–短路双回路解耦的思... 详细信息

由于栅极氧化层可靠性差、短路电流密度大以及短路结温上升速率高,SiC MOSFET功率器件的短路耐受能力较弱,制约着其在电能变换领域的广泛应用。在此背景下,为了提升SiC MOSFET功率器件的短路耐受能力,文中基于换流–短路双回路解耦的思想,设计出具有抗短路能力的SiC MOSFET功率器件封装构型。该构型将半桥中的两个换流回路在功率器件内部解耦,两换流回路的中点各自连接一个交流功率端子(AC+、AC-)。与现有半桥封装构型相比,抗短路构型功率器件的换流电流路径和换流电感Lσ不变,而当发生桥臂直通短路故障时,短路电流因需要额外流经AC+和AC-交流功率端子而延长了短路路径,同时DC功率端子与AC功率端子之间的互感进一步增大了短路回路电感Lsc。基于34mm封装构型设计制造具有抗短路极限工况能力的650V/162A SiC MOSFET功率器件,其短路故障回路电感达到了115nH,是正常换流回路电感的3.6倍;并且,通过短路实验验证所设计的构型相比于现有设计,短路电流峰值降低了20.07%,发热功率降低了21.41%,短路过程中的总发热量降低了30.04%,验证了所设计封装构型具有一定的抗短路性能。

关键词：换流–短路路径解耦短路电感短路抑制

Planning Method and Coordinated Operation Strategy for Multi-station Integration System

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2394-2408页

作者： ankang Miao Yue Yuan Han Wu Junpeng zhu the College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China

A multi-station integration system(MSIS)integrat-ing other multi-type stations provides a new way to realize an intensive development of resources and promote low-carbon en-ergy and its high-efficiency *** this end,a novel multi-station integration planning method and coordinated operation strategy model for the MSIS are established in a new business *** this study,a new business model of the MSIS,with substations as the carrier,integrating distributed photovoltaic,energy storage,electric vehicle charging,data center,and 5G base stations is *** the social environment,natural conditions,and complementary characteristics,a comprehensive index system is established to analyze expansion capability of substations and multi-station combination *** reduction is performed by extracting feature vectors and build-ing a comprehensive evaluation function to select the optimal combination scheme under a specific ***,for the combination scheme in a specific scenario,the optimal ca-pacity configuration and coordinated operation strategy chance-constrained programming model of the MSIS are established under different operating ***,simulations are performed on a practical MSIS located in Wuxi,China,and simulation results demonstrate the rationality and effectiveness of the planning method and coordinated operation strategy model for the MSIS.

关键词： Business model comprehensive index system coordinated operation strategy multi-station combination scheme multi-station integration system planning method

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钙钛矿太阳能电池:从高效率到稳定性

材料导报 2017年第5期31卷 16-22页

作者：万婷婷朱安康郭友敏汪春昌安徽大学物理与材料科学学院合肥230601

钙钛矿太阳能电池(Perovskite solar cells,PSCs)由于制备工艺简单、价格便宜、转换效率高、可制备柔性器件等优点引起广泛关注。近年来,钙钛矿太阳能电池的转换效率不断被刷新,迅速实现了对多晶硅太阳能电池的超越,使其具有巨大的商业... 详细信息

钙钛矿太阳能电池(Perovskite solar cells,PSCs)由于制备工艺简单、价格便宜、转换效率高、可制备柔性器件等优点引起广泛关注。近年来,钙钛矿太阳能电池的转换效率不断被刷新,迅速实现了对多晶硅太阳能电池的超越,使其具有巨大的商业潜力。然而,稳定性成为阻碍钙钛矿太阳能电池商业化的一大问题。介绍了钙钛矿太阳能电池的结构,综述了钙钛矿太阳能电池所取得的研究进展,总结了获得高效率钙钛矿太阳能电池的方法,重点分析了提高钙钛矿太阳能电池稳定性的策略,并指出钙钛矿太阳能电池的发展方向。

关键词：太阳能电池钙钛矿材料传输材料稳定性高效率

胶州湾小型底栖动物丰度、生物量及环境因子的研究

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中国海洋大学学报（自然科学版） 2024年第4期54卷 69-77页

作者：祝琳陈晨杨湘君崔雯瑶邵聪聪滕安康于子山中国海洋大学海洋生命学院山东青岛266003 山东省海洋科学研究院山东青岛266100 中国科学院昆明动物研究所云南昆明650201

为了进一步对胶州湾小型底栖动物有全面地了解,本研究于2018年春季(5月)对胶州湾15个站位进行了小型底栖动物调查取样,研究了小型底栖动物的类群组成、丰度和生物量,同时对这三个参数同沉积环境因子的关系进行了探讨。主要结果如下:研... 详细信息

为了进一步对胶州湾小型底栖动物有全面地了解,本研究于2018年春季(5月)对胶州湾15个站位进行了小型底栖动物调查取样,研究了小型底栖动物的类群组成、丰度和生物量,同时对这三个参数同沉积环境因子的关系进行了探讨。主要结果如下:研究海域共分选出16个小型底栖动物类群,无论从丰度还是生物量,都以线虫为最优势类群;小型底栖动物的平均丰度为(89.689±43.007) ind.·cm^(-2),平均生物量为(104.652±42.706)μg·cm^(-2),其分布都呈现出胶州湾北部高、南部低的特点;小型底栖动物分布在沉积物表层(0~2 cm)、中层(2~5 cm)和底层(5~8 cm)的比例依次减小,丰度占总丰度的比例分别为47.73%、32.24%和20.03%;Pearson相关性结果显示,小型底栖动物的总丰度、线虫以及桡足类的丰度均同Chl a含量呈显著正相关。综合线虫同桡足类丰度之比以及其他相关研究资料,以指示研究海域沉积环境整体优良。

关键词：小型底栖动物类群组成丰度生物量环境因子胶州湾