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Sub-nanometer ultrathin epitaxy of AlGaN and its application in efficient doping

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Light(Science & Applications) 2022年第4期11卷 654-661页

作者： Jiaming wang Mingxing wang Fujun Xu Baiyin Liu Jing Lang Na Zhang Xiangning Kang Zhixin Qin Xuelin Yang xinqiang wang Weikun Ge Bo Shen State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking University100871 BeijingChina Nano-optoelectronics Frontier Center of Ministry of Education Peking University100871 BeijingChina Collaborative Innovation Center of Quantum Matter 100871 BeijingChina

Solving the doping asymmetry issue in wide gap semiconductors is a key dificulty and long-standing challenge for device ***,a desorption-tailoring strategy is proposed to juggle the carrier concentration and *** to the p-doping issue in Al-rich AlGaN,self-assembled p-AlGaN superlattices with an average Al composition of over 50%are prepared by adopting this *** hole concentration as high as 8.1×10^(18)cm^(-3)is thus realized at room temperature,which is attributed to the signifcant reduction of effective Mg activation energy to 17.5 meV through modulating the activating path,as well as the highlighted Mg surface-incorporation by an intentional interruption for *** importantly,benefting from the constant ultrathin barrier thickness of only three monolayers via this approach,vertical miniband transport of holes is verifed in the p-AlGaN superlattices,greatly satisfying the demand of hole injection in device application.280 nm deep-ultraviolet light emitting diodes are then fabricated as a demo with the desorption-tailored Al-rich p-AlGaN superlattices,which exhibit a great improvement of the carrier injection efficiency and light extraction efficiency,thus leading to a 55.7%increase of the light output *** study provides a solution for p-type doping of Al-rich AlGaN,and also sheds light on solving the doping asymmetry issue in general for wide-gap semiconductors.

关键词： AlGaN ultrathin GaN

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光电信息科学与工程专业课程体系改革的建议

科教文汇 2024年第4期 103-106页

作者：于凌尧尹君王新强梁秋裕秦祖军桂林电子科技大学光电工程学院广西桂林541004

文章从课程规划、培养模式以及理论和实践环节三个方面对光电专业课程体系当前存在的问题进行了探讨,分析了光电专业人才培养的素质要求,并针对光电专业课程体系当前存在的问题给出了改革的对策和建议。

关键词：光电信息科学与工程课程体系课程规划理论与实践

Reduced thermal boundary conductance in GaN-based electronic devices introduced by metal bonding layer

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Nano Research 2021年第10期14卷 3616-3620页

作者： Susu Yang Houfu Song Yan Peng Lu Zhao Yuzhen Tong Feiyu Kang Mingsheng Xu Bo Sun xinqiang wang State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Dongguan Institute of Opto-Electronics Peking UniversityDongguan 523808China Tsinghua-Berkeley Shenzhen Institute Tsinghua UniversityShenzhen 518055China Institute of Novel Semiconductors and State Key Laboratory of Crystal Material Shandong UniversityJinan 250100China Tsinghua Shenzhen International Graduate School and Guangdong Provincial Key Laboratory of Thermal Management Engineering&MaterialsTsinghua UniversityShenzhen 518055China Laboratory of Advanced Materials School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of Novel Semiconductors and School of Microelectronics Shandong UniversityJinan 250100China

Achieving high interface thermal conductance is one of the biggest challenges in the nanoscale heat transport of GaN-based devices such as light emitting diodes(LEDs),and high electron mobility transistors(HEMTs).In this work,we experimentally measured thermal boundary conductance(TBC)at interfaces between GaN and the substrates with AuSn alloy as a commonly-used adhesive layer by time-domain thermoreflectance(TDTR).We find that the TBCs of GaN/Ti/AuSn/Ti/Si,GaN/Ti/AuSn/Ti/SiC,and GaN/Ti/AuSn/Ti/diamond,are 16.5,14.8,and 13.2 MW·m^(-2)·K^(-1)at room temperature,*** measured results show that the TBC of GaN/Ti/AuSn/Ti/SiC interface is inferior to the TBC of pristine GaN/SiC interface,due to the large mismatch of phonon modes between AuSn/Ti and substrates,shown as the difference of Debye temperature of two ***,we measured the TBC at interface between GaN and thermal conductive substrates,and provided a guideline for designing the interface between GaN and substrate at HEMT from a thermal management point of view.

关键词： GaN thermal boundary conductance time-domain thermoreflectance(TDTR) diffuse mismatch model

Modification of YSZ fiber composites by Al_(2)TiO_(5) fibers for high thermal shock resistance

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Journal of Advanced Ceramics 2022年第6期11卷 922-934页

作者： Wei LIU Yongshuai XIE Zhezhe DENG Ying PENG Jianhong DONG Ze ZHU Dehua MA Luyi ZHU Guanghui ZHANG xinqiang wang State Key Laboratory of Crystal Materials School of Crystal MaterialsShandong UniversityJinan 250100China

Yttria-stabilized zirconia(YSZ)fiber composites are highly efficient thermal insulating materials;however,the poor thermal shock resistance limits their versatile *** the present study,YSZ fiber was mixed directly with Al_(2)TiO_(5)fiber,which had an extremely low thermal expansion coefficient,to prepare YSZ–Al_(2)TiO_(5)(ZAT)fiber composites by compression molding and heat *** minimum thermal expansion coefficient of the prepared ZAT fiber composites was measured to be 7.74×10^(−6)K^(−1),which was 26%lower than that of the YSZ fiber composites(10.42×10^(−6)K^(−1)).It was shown that the prepared ZAT fiber composites maintain the integrity after undergoing 51 thermal shock cycles between 1100℃and room ***,YSZ fiber composites burst immediately after only one thermal shock cycle under the same *** addition,the ZAT fiber composites also exhibit considerable mechanical and thermal insulating performance.

关键词： Al_(2)TiO_(5)fibers YSZ-Al_(2)TiO_(5)fiber composites thermal expansion thermal shock resistance thermal insulating

益心舒胶囊治疗冠心病心绞痛有效性及安全性的Meta分析

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中药药理与临床 2024年第5期40卷 75-81页

作者：张晓刚赵信科刘凯蒋虎刚王新强赵晓彬李倩蓉李应东甘肃中医药大学兰州730000 甘肃中医药大学附属医院兰州730020

目的:系统评价益心舒胶囊联合常规西药治疗冠心病心绞痛的疗效和安全性。方法:检索相关数据库从建立以来到2021年12月收录的有关益心舒胶囊联合常规西药治疗冠心病心绞痛的临床随机对照试验(RCTs),根据纳入和排除标准选择益心舒胶囊联... 详细信息

目的:系统评价益心舒胶囊联合常规西药治疗冠心病心绞痛的疗效和安全性。方法:检索相关数据库从建立以来到2021年12月收录的有关益心舒胶囊联合常规西药治疗冠心病心绞痛的临床随机对照试验(RCTs),根据纳入和排除标准选择益心舒胶囊联合西药治疗冠心病心绞痛的RCTs,并使用Review Manager 5.3软件进行Meta分析。结果:共纳入22项RCTs,总共3238名患者,Meta分析结果显示,益心舒胶囊联合常规西药能有效提高临床疗效[RR=1.20,95%CI(1.15,1.25)]、降低心绞痛的发生频率[MD=-1.56,95%CI(-2.42,-0.70)]、减少心绞痛持续时间[MD=-1.26,95%CI(-1.87,-0.65)]、提高心电图疗效[RR=1.19,95%CI(1.10,1.29)]、改善临床症状(1)胸痛[RR=1.15,95%CI(1.07,1.24)]、(2)胸闷[RR=2.52,95%CI(1.58,4.02)]、(3)心悸[RR=1.30,95%CI(1.19,1.41)]、(4)乏力[RR=1.42,95%CI(1.19,1.69)]、(5)气短[RR=1.35,95%CI(1.26,1.44)]、改善心率[MD=-3.66,95%CI(-6.61,-0.71)]、改善收缩压[MD=-4.60,95%CI(-9.55,0.35)]、改善舒张压[MD=-1.14,95%CI(-2.43,0.14)]、调节血清总胆固醇(TC)[MD=-0.87,95%CI(-1.46,-0.28)],调节三酰甘油(TG)[MD=-0.19,95%CI(-0.41,0.02)],增加高密度脂蛋白(HDL-C)[MD=0.31,95%CI(0.25,0.37)],降低低密度脂蛋白(LDL-C)[MD=-0.71,95%CI(-1.09,-0.34)]。试验组和对照组之间的不良反应发生率没有显著差异。结论:益心舒胶囊联合常规西药治疗冠心病心绞痛具有一定的临床疗效,值得广大医师临床验证。

关键词：益心舒胶囊冠心病心绞痛 Meta分析

肾脑复元汤联合hUC-MSCs移植对脑缺血再灌注损伤模型大鼠神经细胞凋亡的影响

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亚太传统医药 2024年第9期20卷 18-23页

作者：汪辛强何飘文爱珍贺海霞胡国恒陈亚湖南中医药大学第一附属医院

目的:探讨肾脑复元汤联合人脐带间充质干细胞(hUC-MSCs)移植对脑缺血再灌注损伤模型大鼠神经细胞凋亡的影响。方法:将75只SD大鼠随机分成假手术组、模型组、肾脑复元汤组、hUC-MSCs组、联合组(肾脑复元汤联合hUC-MSCs移植),大脑中动脉栓... 详细信息

目的:探讨肾脑复元汤联合人脐带间充质干细胞(hUC-MSCs)移植对脑缺血再灌注损伤模型大鼠神经细胞凋亡的影响。方法:将75只SD大鼠随机分成假手术组、模型组、肾脑复元汤组、hUC-MSCs组、联合组(肾脑复元汤联合hUC-MSCs移植),大脑中动脉栓塞(MCAO)法制备脑缺血再灌注损伤模型大鼠，每组又分为术后第3天、7天、14天三个时间，术前24h、术后2h及处死前1h对大鼠进行神经功能缺损评分，免疫组化和Western Blot检测脑组织B淋巴细胞瘤-2基因(Bcl-2)、Bcl-2关联X蛋白(Bax)蛋白表达情况。结果:与假手术组比较，模型组神经功能评分显著升高，Bcl-2蛋白表达降低，Bax蛋白表达升高，差异具有统计学意义(P<0.05,P<0.01);与模型组比较，肾脑复元汤组、hUC-MSCs组、联合组(术后第3、7、14天)神经功能评分均显著降低，Bcl-2蛋白表达增多，Bax蛋白表达减少，差异具有统计学意义(P<0.05,P<0.01);与肾脑复元汤组和hUC-MSCs组比较，联合组(术后第3、7、14天)神经功能评分显著降低，Bcl-2蛋白表达增多，Bax蛋白表达减少，差异具有统计学意义(P<0.05,P<0.01)。结论:肾脑复元汤联合hUC-MSCs移植可能通过抑制神经细胞凋亡来促进脑缺血再灌注损伤模型大鼠神经功能修复。

关键词：肾脑复元汤缺血性卒中人脐带间充质干细胞凋亡 Bcl-2 Bax

酒泉市猪圆环病毒2型和3型的流行病学监测和分析

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畜牧兽医杂志 2024年第1期43卷 107-110页

作者：张溪南金鱼张翠花张若玉王新强酒泉市畜牧兽医总站甘肃酒泉735000

为掌握酒泉市五个农业县猪圆环病毒2型(PCV2)和3型(PCV3)流行情况,在辖区内不同区域、不同养殖规模、不同生长阶段的19个规模化养殖场、38个散养户、4家屠宰场采集血清样品230份、粪便样品250份、猪肺脏、扁桃体、颌下淋巴结等组织样品... 详细信息

为掌握酒泉市五个农业县猪圆环病毒2型(PCV2)和3型(PCV3)流行情况,在辖区内不同区域、不同养殖规模、不同生长阶段的19个规模化养殖场、38个散养户、4家屠宰场采集血清样品230份、粪便样品250份、猪肺脏、扁桃体、颌下淋巴结等组织样品220份,进行PCV2和PCV3核酸检测,检出阳性样品138份,阳性率为21.23%,PCV2的阳性率为15.54%,PCV3的阳性率为5.69%,表明PCV2的流行比PCV3更普遍、阳性感染率更高,但在不同区域、不同规模猪场的危害程度和流行情况存在一定的差异。规模养殖场的总体阳性感染率明显低于散养户,保育猪的感染率高于其他生长阶段的生猪。本次实验对酒泉市猪场PCV感染综合防控提供技术支撑,为科学养猪产生积极影响。

关键词：猪圆环病毒酒泉市流行病学监测

冷内镜黏膜切除术对最大径<20mm结直肠侧向发育型肿瘤的临床疗效

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中国现代医生 2024年第19期62卷 22-25,32页

作者：何彤云陆会飞胡丕伟王新强邱雷湖州市第一人民医院麻醉科浙江湖州313000 湖州市第一人民医院消化内科浙江湖州313000 湖州市第一人民医院病理科浙江湖州313000

目的比较冷内镜黏膜切除术(cold snare endoscopic mucosal resection,CS-EMR)与常规内镜黏膜切除术(endoscopic mucosal resection,EMR)治疗最大径0.05)。CS-EMR组患者的手术操作时间、住院时间均显著短于EMR组,钛夹数量、住院费用均显著少于EMR组,术中出血、迟发性出血及迟发性穿孔的发生率均显著低于EMR组(P<0.05)。结论在最大径<20mm CLST治疗中,CS-EMR既保留手术相关并发症少的优点,又具有与EMR相似的治疗效果,且减轻患者的费用负担,值得临床借鉴与推广。

关键词：结直肠侧向发育型肿瘤内镜黏膜切除术冷内镜黏膜切除术临床疗效

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Single-photon emission from isolated monolayer islands of InGaN

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Light(Science & Applications) 2020年第1期9卷 503-509页

作者： Xiaoxiao Sun Ping wang Tao wang Ling Chen Zhaoying Chen Kang Gao Tomoyuki Aoki Mo Li Jian Zhang Tobias Schulz Martin Albrecht Weikun Ge Yasuhiko Arakawa Bo Shen Mark Holmes xinqiang wang State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics School of PhysicsPeking University100871 BeijingChina Collaborative Innovation Center of Quantum Matter 100871 BeijingChina Electron Microscopy Laboratory School of PhysicsPeking University100871 BeijingChina Institute for Nano Quantum Information Electronics The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Leibniz-Institute for Crystal Growth Max-Born-StraBe 212489 BerlinGermany Institute of Industrial Science The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan

We identify and characterize a novel type of quantum emitter formed from InGaN monolayer islands grown using molecular beam epitaxy and further isolated via the fabrication of an array of nanopillar *** optical analysis of the characteristic emission spectrum from the monolayer islands is performed,and the main transmission is shown to act as a bright,stable,and fast single-photon emitter with a wavelength of~400 nm.

关键词： emitter photon monolayer