检索结果-南通市图书馆

A Design and Comparative Investigation of Graded AlxGa1–xN EBL for W-B0.375Ga N/W-B0.45GaN Edge Emitting Laser Diode on AlN Substrate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2022年第4期31卷 683-689页

作者： NIASS Mussaab I. WANG Fang liu yuhuai National Center for International Joint Research of Electronic Materials and Systems International Joint-Laboratory of Electronic Materials and Systems of Henan Province School of Information EngineeringZhengzhou University Zhengzhou Way Do Electronics Co.Ltd. Research Institute of Industrial Technology Co.Ltd. Zhengzhou University Institute of Materials and Systems for Sustainability Nagoya University

In this paper, we numerically demonstrated the possibility of using wurtzite boron gallium nitride(W-BGa N) as active layers(quantum well and quantum barriers) along with aluminum gallium nitride(Al Ga N) to achieve lasing at a deep ultraviolet range at 263nm for edge emitting laser diode. The laser diode structure simulations were conducted by using the CrosslightLASTIP software with a self-consistency model for varies quantity calculations. Moreover, multiple designed structures such as full and half have been achieved as well as the study of the effect of grading engineering/techniques at the electron blocking layer for linearly-graded-down and linearly-graded-up grading techniques were also emphasized. As a result, a maximum emitted power of 26 W,a minimum threshold current of 308 m A, a slope efficiency of 2.82 W/A, and a minimum p-type resistivity of0.228 Ω·cm from the different doping concentrations and geometrical distances were thoroughly observed and jotted down.

关键词： electron blocking layer edge emitting laser diode linearly-graded-down grading techniques gallium compounds quantum well lasers Lasing action in semiconductors wide band gap semiconductors slope efficiency crosslight-LASTIP software deep ultraviolet range linearly-graded-up grading techniques III-V semiconductors Semiconductor lasers II-VI and III-V semiconductors boron compounds substrate aluminium compounds Design of specific laser systems self-consistency model optical design techniques wurtzite boron gallium nitride quantum barriers aluminum gallium nitride

平行沟槽织构对TB6钛合金表面润湿性、摩擦学性能和耐腐蚀性的改善

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

稀有金属材料与工程 2024年第3期53卷 617-624页

作者：郭嘉梁王芳刘俊杰刘玉怀郑州大学电气与信息工程学院电子材料与系统国际联合研究中心河南省电子材料与系统国际联合实验室河南郑州450001 郑州大学智能传感研究院河南郑州450001 郑州大学产业技术研究院有限公司河南郑州450001 郑州唯独电子科技有限公司河南郑州450001 北方民族大学电气与信息工程学院宁夏银川750001

提出了一种快速制备具有超疏水性、耐磨性和耐腐蚀性的Ti-10V-2Fe-3Al(TB6)钛合金表面的方法。通过纳秒激光器对抛光的钛合金进行精确烧蚀,构筑了具有平行微沟槽阵列特征的织构表面。随后,利用紫外线灯照射和十八烷基三氯硅烷溶液浸渍... 详细信息

提出了一种快速制备具有超疏水性、耐磨性和耐腐蚀性的Ti-10V-2Fe-3Al(TB6)钛合金表面的方法。通过纳秒激光器对抛光的钛合金进行精确烧蚀,构筑了具有平行微沟槽阵列特征的织构表面。随后,利用紫外线灯照射和十八烷基三氯硅烷溶液浸渍进行化学改性,进一步增强了表面的疏水性。从表面形态和化学组分的角度分析了微沟槽间隔对织构表面润湿性的影响。结果表明,在干滑动、水润滑和油润滑条件下,所制备的超疏水表面相较于原始亲水表面,平均摩擦系数分别降低了34%、56%和59%。此外,分析了相关摩擦系数变化的机理。通过动电位极化测试验证,所制备的超疏水表面展现出优异的耐腐蚀性,为钛合金基体提供了有效的长期保护。

关键词：激光织构钛合金超疏水性摩擦学性能耐腐蚀性

在线全文

学校读者我要写书评

暂无评论

鸽子在动物机器人领域的研究进展

中国实验动物学报 2024年第2期32卷 248-253页

作者：李蒙蒙杨龙杨莉芳刘玉怀万红尚志刚郑州大学电气与信息工程学院河南省脑科学与脑机接口技术重点实验室郑州450001

鸽子具有集群和归巢习性,善于远途负重与持续飞行,导航和空间认知能力卓越,近年来被广泛应用于动物机器人研究。鸽子机器人通过对鸽子脑内特定的神经靶点施加神经信息干预以实现运动行为控制。本文根据鸽脑内的分层多级神经调控靶点分布... 详细信息

鸽子具有集群和归巢习性,善于远途负重与持续飞行,导航和空间认知能力卓越,近年来被广泛应用于动物机器人研究。鸽子机器人通过对鸽子脑内特定的神经靶点施加神经信息干预以实现运动行为控制。本文根据鸽脑内的分层多级神经调控靶点分布,分别对基于感觉系统、动机和情绪系统或皮层以及中脑运动区的鸽子机器人研究进展进行分类综述,以期为进一步利用鸽子机器人开展空间感知、侦察勘测和反恐搜救等应用研究提供参考和指导。

关键词：鸽子动物机器人刺激调控鸽子机器人

Distribution of microplastics in soil aggregates after film mulching

在线全文

学校读者我要写书评

暂无评论

Soil Ecology Letters 2023年第3期5卷 37-51页

作者： yuhuai liu Yingying Zhong Can Hu Mouliang Xiao Fan Ding Yongxiang Yu Huaiying Yao Zhenke Zhu Jianping Chen Tida Ge Jina Ding State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Key Laboratory of Biotechnology in Plant Protectionof MARA and Zhejiang ProvinceInstitute of Plant VirologyNingbo UniversityNingbo 315211China Ningbo Customs Technology Center Ningbo 315012China College of Mechanical and Electrical Engineering Tarim UniversityAlar 843300China College of Land and Environment Shenyang Agricultural UniversityShenyang 110866China Research Center for Environmental Ecology and Engineering School of Environmental Ecology and Biological EngineeringWuhan Institute of TechnologyWuhan 430205China

Microplastic distribution is non-homogeneous in agricultural soil following plastic film degradation.However,the distribution of microplastics by shape and particle size in different soil aggregates remains unknown.To elucidate the distribution of microplastic shapes and particle sizes in soil aggregates with increasing years of film mulching,four paired fields with film mulching(FM)and no mulching(NM)were examined at 1,5,10,and 20 years after continuous mulching.An increase in soil aggregates of 0.053–0.25 mm diameter was observed;however,soil organic carbon content decreased after long-term FM.Microplastics primarily combined with 0.053–2 mm soil aggregates.Specifically,long-term FM was associated with dominance of film-and fiber-shaped microplastics in soil aggregates of 0.25–2 mm and 0.053–0.25 mm diameter,respectively.Fiber-and granule-shaped microplastics of 0.25–1 mm diameter primarily combined with 0.053–0.25 and 0.25–2 mm soil aggregates,respectively.Film-shaped microplastics of diameter>1 mm and diameter 0.05–0.25 mm primarily combined with 0.25–2 mm soil aggregates.Therefore,distribution of microplastics in soil aggregates can be used to monitor soil health and quality,greatly enhancing our understanding of the risk posed by microplastics to the environment.

关键词： film mulching microplastic soil aggregate agricultural soil

Survivable Routing Protocol for Green Wireless Mesh Networks Based on Energy Efficiency

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2014年第8期11卷 117-124页

作者： YU Yinpeng PENG yuhuai liu Yejun GUO Lei SONG Meng College of Information Science and Engineering Northeastern University Shenyang 110819 China

This paper proposes a new Energyefficient Survivable Routing Protocol(ESRP)based on solar energy and wind mixed for power supply in green wireless mesh networks(WMNs).The ESRP combines hop penalty strategy and flooding delaying strategy to improve the performances of traditional routing protocol.This paper uses QualNet to simulate and verify the performances of proposed ESRP.Compared with the traditional routing protocol,the simulation results show that the energy utilization of ESRP is more efficient by 13%.At the same time,ESRP is more load-balanced to postpone the appearance of the first energy depletion node and reduce the number of energy depletion nodes,and thus it effectively improves network survivability.

关键词：无线Mesh网络路由协议能量利用效率能效无线网状网惩罚策略能量消耗负载平衡

Full-duplex light communication with a monolithic multicomponent system

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2018年第1期7卷 255-261页

作者： Yongjin Wang Xin Wang Bingcheng Zhu Zheng Shi Jialei Yuan Xumin Gao yuhuai liu Xiaojuan Sun Dabing Li Hiroshi Amano Peter Grünberg Research Center Nanjing University of Posts and TelecommunicationsNanjing 210003China Laboratory of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of EducationNanjing 210003China Department of Electronics Engineering Zhengzhou UniversityScience Road 100Zhengzhou 450001China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Institute of Materials and Systems for Sustainability Nagoya UniversityNagoya 464-8062Japan

A monolithic multicomponent system is proposed and implemented on a III-nitride-on-silicon platform,whereby two multiple-quantum-well diodes(MQW-diodes)are interconnected by a suspended waveguide.Both MQW-diodes have an identical low-In-content InGaN/Al0.10Ga0.90N MQW structure and are produced by the same fabrication process flow.When appropriately biased,both MQW-diodes operate under a simultaneous emission-detection mode and function as a transmitter and a receiver at the same time,forming an in-plane full-duplex light communication system.Real-time full-duplex audio communication is experimentally demonstrated using the monolithic multicomponent system in combination with an external circuit.

关键词： communication monolithic diodes

以持续默读激发农村初中生积极阅读情感的策略

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

英语教师 2022年第3期22卷 86-88页

作者：刘玉怀广东省中山市小榄镇菊城中学广东中山528400

分析农村初中英语阅读教学现状。提出持续默读是一种行之有效的发展农村初中生积极阅读情感的方法。阐述以持续默读激发农村初中生积极阅读情感的理论依据。认为在初中英语阅读教学中,教师应以阅读材料激发学生的阅读动机,以适合阅读的... 详细信息

分析农村初中英语阅读教学现状。提出持续默读是一种行之有效的发展农村初中生积极阅读情感的方法。阐述以持续默读激发农村初中生积极阅读情感的理论依据。认为在初中英语阅读教学中,教师应以阅读材料激发学生的阅读动机,以适合阅读的环境和氛围激发学生的阅读兴趣,以良好的阅读体验和读后活动引导学生养成良好的阅读习惯。

关键词：持续默读阅读动机阅读兴趣阅读情感初中英语

在线全文

学校读者我要写书评

暂无评论

基于几何分析法的低轨星座设计

大地测量与地球动力学 2023年第10期43卷 1003-1007页

作者：刘予怀黄文德张晓飞广西大学机械工程学院南宁市530004 南宁学院智能制造学院南宁市530200

针对导航增强的实时性、连续性及高精度定位等需求,提出一套基于几何分析法的低轨星座设计方案。首先确定单星对地覆盖场景的关键要素,结合具体情况并通过几何约束关系得出基本参数;然后提出一种混合星座设计方法,综合考虑地球非球形引... 详细信息

针对导航增强的实时性、连续性及高精度定位等需求,提出一套基于几何分析法的低轨星座设计方案。首先确定单星对地覆盖场景的关键要素,结合具体情况并通过几何约束关系得出基本参数;然后提出一种混合星座设计方法,综合考虑地球非球形引力对卫星轨道的影响,以确定混合星座的参数配置;最后通过仿真实验论证方案的可行性。仿真结果表明,本文方案设计的星座能够提供满足用户需求的导航增强功能,在卫星的覆盖层数、几何分布及轨道稳定性等方面表现优异,为低轨导航增强领域的发展提供了数据支撑。

关键词：导航增强几何分析法混合星座设计非球形引力仿真实验

在线全文

学校读者我要写书评

暂无评论

基于p-型氮化硼材料的深紫外LED设计

光电子．激光 2023年第6期34卷 569-575页

作者：王莉莉符彬啸张旭薛琦刘玉怀郑州大学电气信息学院河南省激光与光电信息技术重点实验室河南郑州450001 郑州大学电子信息学院电子材料与系统国际联合研究中心河南郑州450001

本文通过在发光二极管(light emitting diode,LED)的p掺杂区域引入六方氮化硼(hexagonal boron nitride,h-BN)结构,以提升深紫外(deep ultraviolet,DUV)LED的空穴浓度。通过COMSOL有限元软件对LED器件量子阱区域建模,结果表明:1)掺入h-BN后,p区域空穴浓度提升了约一个数量级,发射率和内量子效率(inernal quantum efficiency,IQE)得到了显著提升;2)随着h-BN厚度的增加,p区空穴浓度显著提升;3)h-BN相对于AlGaN材料带隙上移的特性,有效地阻挡了电子泄露,使量子阱区域电子和空穴复合进一步增强,有效改善了DUV LED的发光效率。本文提出的设计结构为实验制备高量子效率的DUV LED器件提供了解决方案。

关键词：量子阱六方氮化硼(h-BN)材料空穴浓度 AlGaN材料