检索结果-南通市图书馆

Pairwise entanglement and local polarization of Heisenberg model

Science china(physics,Mechanics & Astronomy) 2008年第10期51卷 1515-1522页

作者： xi xiaoqiang1,2. zhang tao3, YUE RuiHong3,{2., xi’an institute of post and telecommunications, xi’an 710061, china 2.Beijing National Laboratory for Condensed Matter physics, institute of physics, Chinese Academy of Sciences, Beijing 100080, china 3 institute of Modern physics, Northwest University, {12.’an 710069, china 4 department of physics, Ningbo University, Ningbo 3152.1, china department of applied {2. and physics Xi’an Institute of Post and Telecommunications Xi’an China Beijing National Laboratory for Condensed Matter physics Institute of Physics Chinese Academy of Sciences Beijing China institute of Modern physics Northwest University Xi’an China department of physics Ningbo University Ningbo China

The characteristics of pairwise entanglement and local polarization (LP) are dis-cussed by studying the ground state (states) of the Heisenberg XX model. The re-sults show that: the ground state (states) is (are) composed of the micro states with the minimal polarization (0 for even qubit and 1/2.for odd qubit); LP and the prob-ability of the micro state have an intimate relation, i.e. the stronger the LP, the smaller the probability, and the same LP corresponds to the same probability; the pairwise entanglement of the ground state is the biggest in all eigenvectors. It is found that the pairwise entanglement is decreased by the state degeneracy and the system size. The concurrence approaches a fixed value of about 0.3412.(for odd-qubit chain) or 0.3491 (for even-qubit chain) if the qubit number is large enough.

关键词： Heisenberg XX model local polarization pairwise entanglement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient thermal dissipation in wafer-scale heterogeneous integration of single-crystalline𝛽β-Ga_(2.O_(3)thin film on SiC

引用

Fundamental Research 2021年第6期1卷 691-696页

作者： Wenhui Xu Tiangui You Yibo Wang Zhenghao Shen Kang liu Lianghui zhang Huarui Sun Ruijie Qian Zhenghua An Fengwen Mu Tadatomo Suga Genquan Han {2.n Ou Yue Hao {2. Wang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi’an 710071China School of Science and Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China department of physics State Key Laboratory of Surface PhysicsInstitute of Nanoelectronic Devices and Quantum ComputingFudan UniversityShanghai 200433China High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Collaborative Research Center Meisei UniversityHinoJapan Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The semiconductor,β-Ga_(2.O_(3)is attractive for applications in high power electronic devices with low conduction loss due to its ultra-wide bandgap(∼4.9 eV)and large Baliga’s figure of ***,the thermal conductivity of𝛽β-Ga_(2.O_(3)is much lower than that of other wide/ultra-wide bandgap semiconductors,such as SiC and GaN,which results in the deterioration of𝛽β-Ga_(2.O_(3)-based device performance and reliability due to *** overcome this problem,a scalable thermal management strategy was proposed by heterogeneously integrating wafer-scale single-crystalline𝛽β-Ga_(2.O_(3)thin films on a highly thermally conductive SiC *** of the transferred𝛽β-Ga_(2.O_(3)thin film indicated a uniform thickness to within±2.01%,a smooth surface with a roughness of 0.2.nm,and good crystalline quality with an X-ray rocking curves(XRC)full width at half maximum of 80 *** thermoreflectance measurements were employed to investigate the thermal *** thermal performance of the fabricated𝛽β-Ga_(2.O_(3)/SiC heterostructure was effectively improved in comparison with that of the𝛽β-Ga_(2.O_(3)bulk wafer,and the effective thermal boundary resistance could be further reduced to 7.5 m 2.K/GW by a post-annealing *** barrier diodes(SBDs)were fabricated on both a𝛽β-Ga_(2.O_(3)/SiC heterostructured material and a𝛽β-Ga_(2.O_(3)bulk *** thermal imaging revealed the temperature increase of the SBDs on𝛽β-Ga_(2.O_(3)/SiC to be one quarter that on the𝛽β-Ga_(2.O_(3)bulk wafer with the same {2. power,which suggests that the combination of the𝛽-Ga_(2.O_(3)thin film and SiC substrate with high thermal conductivity promotes heat dissipation in𝛽β-Ga_(2.O_(3)-based devices.

关键词： Thermal management Heterogeneous integration Wafer scale𝛽β-Ga_(2.O_(3)on SiC Ion-cutting technique Schottky barrier diodes(SBDs) Transient thermoreflectance(TTR) measurements

来源：

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

Residual solvent extraction via chemical displacement for efficient and stable perovskite solar cells

引用

Journal of Energy Chemistry 2021年第10期30卷 8-14,I0001页

作者： Min Fang Lei tao Wen Wu Qi Wei Yingdong xia Ping Li Xueqin Ran Qi Zhong Guichuan xing Lin Song Peter Müller-Buschbaum Hui zhang Yonghua Chen Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)Nanjing 211816JiangsuChina Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Key Laboratory of Advanced Textile Materials&Manufacturing Technology Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina institute of Joint Key Laboratory of the applied {2. and Materials Engineering University of MacaoAvenida da UniversidadeTaipa 999078MacaoChina Lehrstuhl für Funktionelle Materialien Physik DepartmentTechnische Universität München.James-Franck-Str.185748 GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenLichtenbergstr.185748 GarchingGermany

Solvent residue is inevitable to occur in solution processed thin films,but its influence on the thin film quality has not been identified and addressed to *** acetate(MAAc)ionic liquid has recently been realized as an environmentally friendly solvent for solution processed *** specific high viscosity,low vapor pressure and strong association with perovskite precursor of the MAAc solvent is a double-edged sword,which endowed an advantageously ambient air operational and anti-solvent free perovskite deposition,but the MAAc is likely to be retained within the film and bring in detrimental effects on device performance of the corresponding solar ***,we reported a novel route to eliminate the residual solvent via a facial hydrochloric acid(HCl)annealing post-treatment(HAAP).In particular,chemical displacement reaction between the incorporated HCl and residual MAAc can be initiated to form volatile MACl and HAc,efficiently extracting MAAc *** the meanwhile,the stimulated mass transport via downward penetration and upward escape can trigger secondary perovskite growth with enlarged grain size and smoothened surface,leading to reduced defect state and improved interfacial contact intimacy,and also partial chloride ions are able to enter the crystal lattice to stabilize perovskite phase *** a result,a champion efficiency up to2..78%originating from enhanced Voc was achieved,and more than 96%of its initial efficiency can be maintained after 1000 h shelf-storage.

关键词： Perovskite Solar cells Solvent residue Methylammonium acetate post-treatment Chemical displacement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A novel glasses-free virtual reality rehabilitation system on improving upper limb motor function among patients with stroke:A feasibility pilot study

引用

Medicine in Novel Technology and Devices 2021年第3期11卷 125-131页

作者： Haoyu xie Hantao {2. Haowen Liang Hang Fan Jianying Zhou Wai Leung Ambrose Lo Le Li department of Rehabilitation Medicine The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou510080China School of physics Sun Yat-sen UniversityGuangzhou510275China Guangzhou Midstereo Co.Ltd. Guangzhou510275China institute of Medical Research Northwestern Polytechnical UniversityXi’an710072China

Background:Virtual reality(VR)technology is increasingly used in stroke *** study aimed to investigate the effectiveness of using the glasses-free VR training to improve motor function of upper limb in patients with ***:Twelve patients with stroke were recruited to participate in the intervention of 3 *** the baseline and post intervention,two times of evaluation including Fugl-Meyer upper-extremity scale(FMS-UE),transcranial magnetic stimulation(TMS)measurement and motion evaluation were ***:No significant difference was observed between two groups at baseline *** the intervention,the FMS-UE scores presented a greater improvement in the VR group compared with the control *** measurement showed that there was significant difference in cortex latency and central motor conduction time between two groups after the intervention,but no significant difference in the amplitude of motor event potential was *** addition,there was a significant correlation between game scores and FMS-UE ***:The novel glasses-free VR training was at least as effective as conventional occupational therapy in upper limb motor function,improving nerve conduction time and corticospinal excitability in patient with stroke.

关键词： Virtual reality Transcranial magnetic stimulation Stroke Upper limb motor function Fugl-meyer upper-extremity scale Corticospinal excitability

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：