检索结果-南通市图书馆

Approaching ohmic contact to two-dimensional semiconductors

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2019年第19期64卷 1426-1435页

作者： Kailang Liu Peng Luo Wei Han sanjun yang Shasha Zhou Huiqiao Li Tianyou Zhai State Key Laboratory of Material Processing and Die & Mould Technology School of Material Sciences and Engineering Huazhong University of Science and Technology

Two-dimensional semiconductors have attracted immense research interests owing to their intriguing properties and promising applications in electronic and optoelectronic ***,the performance of these devices is drastically hindered by the large Schottky barrier at the electric contact interface,which is hardly tunable due to the Fermi level pinning *** this review,we will analyze the root causes of the contact problems for the two-dimensional semiconductor devices and summarize the strategies on the basis of different contact geometries,aiming to lift out the Fermi level pinning effect and achieve the ohmic ***,the remarkable improvement of the device performance thanks to these optimized contacts will be *** the end,the merits and limitations of these strategies will be discussed as well,which potentially gives a guideline for handling the electric contact issues in two-dimensional semiconductors devices.

关键词： Two-dimensional semiconductor Ohmic contact Fermi level pinning Schottky barrier

Salt-assisted chemical vapor deposition of two-dimensional materials

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2019年第10期62卷 1300-1311页

作者： Wei Han Kailang Liu sanjun yang Fakun Wang Jianwei Su Bao Jin Huiqiao Li Tianyou Zhai State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology

Two-dimensional(2D) materials with atomic thickness are promising candidates for the applications in future semiconductor devices, owing to their fascinating physical properties and superlative optoelectronic performance. Chemical vapor deposition(CVD) is considered to be an efficient method for large-scale preparation of 2D materials toward practical ***, the high melting points of metal precursors and the thermodynamics instabilities of metastable phases limit the direct CVD synthesis of plenty of 2D materials. The salt has recently been introduced into the CVD process, which proved to be effective to address these issues. In this review, we highlighted the latest progress in the salt-assisted CVD growth of 2D materials, including layered and non-layered crystals. Firstly, strategies of adding salts are summarized. Then, the salt-assisted growth of various layered materials is presented, emphasizing on the transition metal chalcogenides of stable and metastable phases. Furthermore, strategies to grow ultrathin non-layered materials are discussed. We provide viewpoints into the techniques of using salt, the effects of salt, and the growth mechanisms of 2D crystals. Finally, we offer the challenges to be overcome and further research directions of this emerging salt-assisted CVD technique.

关键词： salt-assisted chemical vapor deposition 2D materials transition metal dichalcogenides non-layered materials

A Universal Atomic Substitution Conversion Strategy Towards Synthesis of Large‑Size Ultrathin Nonlayered Two‑Dimensional Materials

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2021年第11期13卷 79-91页

作者： Mei Zhao Sijie yang Kenan Zhang Lijie Zhang Ping Chen sanjun yang yang Zhao Xiang Ding Xiaotao Zu Yuan Li Yinghe Zhao Liang Qiao Tianyou Zhai School of Physics University of Electronic Science and Technology of China(UESTC)Chengdu 610054People’s Republic of China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074People’s Republic of China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province Institute of New Materials and Industrial TechnologiesCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035People’s Republic of China

Nonlayered two-dimensional(2D)materials have attracted increasing attention,due to novel physical properties,unique surface structure,and high compatibility with microfabrication ***,owing to the inherent strong covalent bonds,the direct synthesis of 2D planar structure from nonlayered materials,especially for the realization of large-size ultrathin 2D nonlayered materials,is still a huge ***,a general atomic substitution conversion strategy is proposed to synthesize large-size,ultrathin nonlayered 2D *** nonlayered CdS as a typical example,large-size ultrathin nonlayered CdS single-crystalline flakes are successfully achieved via a facile low-temperature chemical sulfurization method,where pre-grown layered CdI2 flakes are employed as the precursor via a simple hot plate assisted vertical vapor deposition *** size and thickness of CdS flakes can be controlled by the CdI2 *** growth mechanism is ascribed to the chemical substitution reaction from I to S atoms between CdI2 and CdS,which has been evidenced by experiments and theoretical *** atomic substitution conversion strategy demonstrates that the existing 2D layered materials can serve as the precursor for difficult-to-synthesize nonlayered 2D materials,providing a bridge between layered and nonlayered materials,meanwhile realizing the fabrication of large-size ultrathin nonlayered 2D materials.

关键词： Nonlayered 2D materials Large-size ultrathin CdS flakes Atomic substitution conversion Layered-nonlayered structural transformation

Ultra-broadband,fast,and polarization-sensitive photoresponse of low-symmetry 2D NdSb_(2)

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第6期15卷 5469-5475页

作者： Gang Li Hanlin Zhang Yong Li Shiqi Yin Xucai Kan Wensen Wei Haifeng Du Binghui Ge Chao An Mingliang Tian Feng Yan sanjun yang Tianyou Zhai Liang Li Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China Engineering Technology Research Center of Magnetic Materials School of Physics and Materials ScienceAnhui UniversityHefei 230601China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of ScienceHefei 230031China Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong 999077China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074China

Broadband photodetectors with polarization-sensitive ability have received extraordinary attention for modern optoelectronic *** photodetectors should possess high responsivity,fast response,and good stability,which are rare to meet at the same time in one low-symmetric two-dimentional(2D)*** this work,neodymium diantimonides(RSb_(2)),a member of light rare-earth diantimonides RSb_(2)(R=La–Nd,Sm)with low-symmetry structure,is introduced as a fascinating highly anisotropic 2D material for broadband detection(532 nm to 4μm).The photodetector exhibits a responsivity of 0.49 mA·W^(−1)with 15μs response time at 532 nm and highly stable performance under ambient conditions over 8 ***,we identify the polarization-sensitive photoresponse of the detector and demonstrate a high anisotropic factor~*** addition,strong inplane anisotropy is revealed by anisotropic phonon response and the photodetection mechanism is investigated by scanning photocurrent microscopy *** pioneer work on RSb_(2)paves the way for further exploration of 2D RSb_(2)for high performance polarized photodetectors with fast photothermoelectric response.

关键词： ultra-broadband fast response polarization-sensitive photodetector RSb_(2)

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

北京冬奥会举办对中国经济发展的效应研究

体育与科学 2022年第1期43卷 1-6页

作者：杨三军中国矿业大学体育教研部

北京2022年冬奥会即将举办,北京作为世界首个"双奥之城"也将以新形象展现在世界面前。北京冬奥会的举办无论对进一步促进冰雪产业在我国规模化发展,还是对推动我国经济发展都具有重要意义。本文从北京冬奥会对冰雪经济、区域经济以及经... 详细信息

北京2022年冬奥会即将举办,北京作为世界首个"双奥之城"也将以新形象展现在世界面前。北京冬奥会的举办无论对进一步促进冰雪产业在我国规模化发展,还是对推动我国经济发展都具有重要意义。本文从北京冬奥会对冰雪经济、区域经济以及经济新发展的影响等角度出发,结合社会转型期治理现代化等思考,对北京冬奥会举办对中国经济发展的效应进行了研究,认为:在北京冬奥会的推动下,我国冰雪产业得以规模化发展,冰雪消费需求、冰雪文旅活力、冰雪产业结构等得到了提升;北京冬奥会不仅在"战略耦合"下促进了国内区域间经济协同,而且在"一带一路"下促进了国际区域间合作。科技冬奥推动了"冰雪+"产业集群的形成、冬奥遗产经济的开发、科学训练等技术的经济转化、冬奥传播及媒介经济的发展。

关键词：消费文旅产业升级区域合作产业集群冬奥会冰雪产业

基于多水平模型的运动员损伤康复与康复心理相关研究——以田径运动员为例

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

沈阳体育学院学报 2015年第2期34卷 92-98页

作者：杨三军中国矿业大学北京100083

研究背景:在运动员的损伤康复过程中用心理综合问卷测量疼痛等级、与康复锻炼活动的关系。研究对象:通过分析1 034名田径运动员前交叉韧带手术后疼痛的波动情况,讨论了疼痛与运动损伤的心理反应有关的个人及环境变量之间的关系。研究方... 详细信息

研究背景:在运动员的损伤康复过程中用心理综合问卷测量疼痛等级、与康复锻炼活动的关系。研究对象:通过分析1 034名田径运动员前交叉韧带手术后疼痛的波动情况,讨论了疼痛与运动损伤的心理反应有关的个人及环境变量之间的关系。研究方法:主要采用分层线性模型针对运动损伤康复时间对运动员损伤疼痛的影响、所从事的康复活动对运动员损伤疼痛的影响、个人特征对运动损伤疼痛的影响及其运动员个人特征、每日活动及疼痛的关系等问题进行探讨。结果:表明分层线性模型在分析运动员损伤手术后的康复过程中疼痛预测因子方面有着积极作用,为康复专家更科学地指导运动员恢复提供了理论依据和数据支持。

关键词：多水平模型纵向分析康复心理运动损伤康复

间歇性练习对TRIMP计算与运动负荷评价的影响

在线全文

学校读者我要写书评

暂无评论

首都体育学院学报 2016年第2期28卷 152-155页

作者：杨三军中国矿业大学(北京)体育系北京100082

通过间歇性练习与持续性练习实验后受测者身体机能变化来比较分析不同的练习方法对TRIMP计算与评价的影响。方法:按一定的跑动距离与跑动速度,在跑步机上让12名受测者以25%、50%、75%以及100%最大摄氧量速度(VVO2max)随机完成持续性... 详细信息

通过间歇性练习与持续性练习实验后受测者身体机能变化来比较分析不同的练习方法对TRIMP计算与评价的影响。方法:按一定的跑动距离与跑动速度,在跑步机上让12名受测者以25%、50%、75%以及100%最大摄氧量速度(VVO2max)随机完成持续性或间歇性进行的4×4min的跑步练习。结果:在跑步机上进行75%、100%最大摄氧量速度(VVO2max)间歇性跑步练习血乳酸浓度要显著性高于其持续性跑步练习;以25%最大摄氧量速度(VVO2max)进行间歇性跑步练习耗氧量要显著性高于其持续性跑步练习;以25%、75%、100%最大摄氧量速度(VVO2max)进行间歇性跑步练习心率储备百分比(HRr)要显著性高于其持续性跑步练习;心率储备百分比(HRr)=0.8、0.9、1时,间歇性练习实验个体TRIMP平均值要显著高于其持续性练习实验。结论:大负荷强度间歇性运动对心率储备百分比(HRr)-血乳酸(BLa)曲线关系及对TRIMP的计算与评价都将产生显著性改变。在集体项目中如果沿用持续性练习实验得出的心率储备百分比(HRr)-血乳酸(BLa)加权值计算得出的TRIMP值将会显著低估机体的实际运动负荷。

关键词：间歇练习 TRIMP 心率储备百分比血乳酸

深化体教融合促进青少年体质健康的现实诉求、实践路径与保障机制

在线全文

学校读者我要写书评

暂无评论

西安体育学院学报 2021年第3期38卷 366-371页

作者：杨三军刘波中国矿业大学体育教研部北京100083 清华大学体育部北京100084

运用文献资料、专家访谈和归纳分析法等研究方法,从分析我国青少年体质健康存在的主要问题和影响青少年参与体育活动的因素入手,提出了深化体教融合促进青少年体质健康发展的实践路径,即:构建多维度的体教融合价值体系;建立青少年体质... 详细信息

运用文献资料、专家访谈和归纳分析法等研究方法,从分析我国青少年体质健康存在的主要问题和影响青少年参与体育活动的因素入手,提出了深化体教融合促进青少年体质健康发展的实践路径,即:构建多维度的体教融合价值体系;建立青少年体质健康发展的多主体联动机制;理顺联动机制供需主体的关系;有效开发学校体育资源,实现青少年体质健康的可持续发展。在此基础上,提出构建青少年体质健康发展的综合保障机制,为推动青少年体质健康发展的提供良好环境。

关键词：体教融合青少年体质健康保障机制

国外运动项目中心化对新时代我国学校体育发展的启示

在线全文

学校读者我要写书评

暂无评论

体育学刊 2022年第3期29卷 96-102页

作者：杨三军叶茂盛中国矿业大学(北京)体育教研部北京100083

采用专家访谈与文献资料法,对我国学校体育发展的主要问题和新时代体育政策的治理逻辑进行分析,并对比分析英国、德国和日本学校体育发展的规律。研究认为:英国、德国和日本采用“运动项目中心化”发展策略,即在国家体育整体规划的实施... 详细信息

采用专家访谈与文献资料法,对我国学校体育发展的主要问题和新时代体育政策的治理逻辑进行分析,并对比分析英国、德国和日本学校体育发展的规律。研究认为:英国、德国和日本采用“运动项目中心化”发展策略,即在国家体育整体规划的实施过程中,政府以不同运动项目发展为中心线安排相关工作,实现了运动项目纵向系统化发展的一种发展策略。提出新时代我国学校体育应当借鉴国外“运动项目中心化”的经验,围绕运动项目的发展,从体育系统参与一体化课程建设入手,通过项目分类赛事助推体教融合、构建学校体育生态圈和大数据平台,最终实现学校体育的良性发展。

关键词：学校体育运动项目中心化体教融合一体化课程