检索结果-南通市图书馆

Chinese Journal of Polymer Science 2024年第12期42卷 2002-2010,I0011页

作者： xiang shi Center for Advanced Material Diagnostic Technology Shenzhen Technology UniversityShenzhen518118China Laboratoire de Physique des Solides CNRSUniversitéParis-SudUniversitéParis-SaclayOrsay91400France

An improved X-ray apparatus that combines tensile testing and X-ray diffraction has been designed and constructed to conduct timeresolved experiments during uniaxial *** utilizing mortise-like clamping jaws and dogbone-shaped specimens,this setup allows for the simultaneous recording of high-quality mechanical responses and 2D diffraction patterns due to the minimization of experimental errors from sample slippage or premature ***,the local extension ratio can be accurately determined based on thickness variation,and the Hermans'orientation function was demonstrated to be a reliable method with high accuracy to calculate the segmental orientation parameter〈P_(2)〉in elastomeric samples under high degree of *** summary,this innovative tensile-WAXD instrument has proven to be a promising and powerful technique for investigating the“stress-deformation-segmental orientation”relationship in elastomers with high extensibilities.

关键词： X-ray apparatus Elongation calculation Segmental orientation In situ measurement

About the Energy of the Universe

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1996年第6期13卷 409-411页

作者： FENG shi-xiang DUAN Yi-shi Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Institute of Theoretical Physics Lanzhou UniversityLanzhou 730000

We use the general covariant conservation law of energy-momentum,which is general covariant and therefore preferable to the non-covariant conservation laws,to analyse the energy of the universe and obtained vanishing ... 详细信息

关键词： energy vanishing discussions

A time and charge measurement board for muon tomography of high-Z materials

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

Nuclear Science and Techniques 2017年第3期28卷 104-108页

作者： shi-Tao xiang Hao Liang State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

In this paper, a versatile time and charge measurement(MQT) board for muon tomography is described in detail. For time measurement, the general-purpose timeto-digital converter(TDC) chip TDC-GP2 is employed,while for charge measurement, digitization plus numerical integration in field programmable gate array is *** tests demonstrate that the total 32 channels of two MQT boards have a time resolution of superior than100 ps, with excellent linearity for time and charge measurement.

关键词： Time and charge measurement Generalpurpose time-to-digital converter (TDC-GP2) Muon tomography

Alternating current electroluminescent fibers for textile displays

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第1期10卷 14-16页

作者： Zhen Wang xiang shi Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Scienceand Laboratory of Advanced Materials Fudan University

With the emerging 5G and Internet of Things,wearables are developing vigorously [1].Wearables are expected to be flexible,lightweight,breathable and comfortable to satisfy daily applications[2].Integrating electronic devices into textiles to form an electronic textile(e-textile) will simultaneously meet the above requirements and the need for daily clothes.E-textiles with functions of communicating,sensing and supplying power have been widely explored.

关键词：

A Novel MDFA-MKECA Method With Application to Industrial Batch Process Monitoring

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2020年第5期7卷 1446-1454页

作者： Yinghua Yang xiang shi Xiaozhi Liu Hongru Li College of Information Science and Engineering Northeastern UniversityShenyang 110819China

For the complex batch process with characteristics of unequal batch data length,a novel data-driven batch process monitoring method is proposed based on mixed data features analysis and multi-way kernel entropy component analysis(MDFA-MKECA)in this *** the mechanistic knowledge,different mixed data features of each batch including statistical and thermodynamics entropy features,are extracted to finish data *** that,MKECA is applied to reduce data dimensionality and finally establish a monitoring *** proposed method is applied to a reheating furnace industry process,and the experimental results demonstrate that the MDFA-MKECA method can reduce the calculated amount and effectively provide on-line monitoring of the batch process.

关键词： MDFA MKECA process monitoring reheating furnace statistical features thermodynamics entropy feature

THE RADIATION AND DIFFRACTION OF WATER WAVES BY A BOTTOM-MOUNTED CIRCULAR CYLINDER IN A TWO-LAYER FLUID

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第1期19卷 1-8页

作者： YOU Yun-xiang shi Qiang MIAO Guo-ping School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200030 China.

An analytical method was proposed to analyze the radiation and diffraction of water waves by a bottom-mounted circular cylinder in a two-layer fluid. Analytical expressions for added mass and damping coefficients, as well as the wave excitation forces of the circular cylinder were obtained by an eigenfunction expansion method. The hydrodynamic forces on the bottom-mounted circular cylinder in a two-layer fluid include not only the added mass and damping coefficients, but also the wave forces of the surface and internal-wave modes. This is different from the case of a homogenous fluid. Some examples were given, showing that density stratification can have a relative large effect on these hydrodynamic forces over a wide range of frequencies.

关键词： two-layer fluid bottom-mounted cylinder,surface-wave mode internal-wave mode hydrodynamic forces

Multipartite Entanglement of a Tetrahedron Lattice

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第5X期46卷 863-872页

作者： ZHANG Rong ZHU shi-Qun HAO xiang School of Physical Science and Technology Suzhou University Suzhou 215006 China

Three-dimensional Heisenberg model in the form of a tetrahedron lattice is investigated. The concurrence and multipartite entanglement are calculated through 2-concurrence C and 4-concurrence C4. The concurrence C and multipartite entanglement G4 depend on different coupling strengths Ji and are decreased when the temperature T is increased. For a symmetric tetrahedron lattice, the concurrence C is symmetric about J1 when J~ is negative while the multipartite entanglement G4 is symmetric about J1 when J2 〈 2. For a regular tetrahedron lattice, the concurrence G of ground state is 1/3 for ferromagnetic case while G = 0 for antiferromagnetic ***. However, there is no multipartitc entanglement since C4=0 in a regular tetrahedron lattice. The external magnetic field 13 can increase the maximum value of the concurrence GB and induce two or three peaks in Cn. There is a peak in the multipartite entanglement G4 B when G4B is varied as a function of the temperature T. This peak is mainly induced by the magnetic field B.

关键词： multipartite entanglement concurrence three dimensions tetrahedron lattice

A cortical bone milling force model based on orthogonal cutting distribution method

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2020年第2期8卷 204-215页

作者： Qi-Sen Chen Li Dai Yu Liu Qiu-xiang shi School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819People's Republic of China

In orthopedic surgery,the bone milling force has attracted attention owing to its significant influence on bone cracks and the breaking of *** is necessary to build a milling force model to improve the process of bone *** paper proposes a cortical bone milling force model based on the orthogonal cutting distribution method(OCDM),explaining the effect of anisotropic bone materials on milling *** to the model,the bone milling force could be represented by the equivalent effect of a transient cutting force in a rotating period,and the transient milling force could be calculated by the transient milling force coefficients,cutting thickness,and cutting *** on the OCDM,the change in transient cutting force coefficients during slotting can be described by using a quadratic ***,the force model is updated for robotic bone milling,considering the low stiffness of the robot ***,an experimental platform for robotic bone milling is built to simulate the milling process in clinical operation,and the machining signal is employed to calculate the milling ***,according to the experimental result,the rationality of the force model is verified by the contrast between the measured and predicted *** milling force model can satisfy the accuracy requirement for predicting the milling force in the different processing directions,and it could promote the development of force control in orthopedic surgery.

关键词： Robotic milling force Cortical bone Cutting force coefficient Orthogonal cutting distribution

Modeling and analysis of ground target radiation cross section

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

Chinese Science Bulletin 2008年第9期53卷 1444-1449页

作者： shi xiang LOU GuoWei LI XingGuo Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences Shanghai 200050 China Research Institute of MMW and Light Wave Near-sensing Technology Nanjing University of Science and Technology Nanjing 210094 China

Based on the analysis of the passive millimeter wave (MMW) radiometer detection, the ground target radiation cross section is modeled as the new token for the target MMW radiant characteristics. Its ap- plication and actual testing are discussed and analyzed. The essence of passive MMW stealth is target radiation cross section reduction.

关键词：微波模型模拟辐射交叉断面辐射计

Cu掺杂及缺陷共存对ZnO光催化影响的理论研究

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第2期42卷 24-32页

作者：张海峰赵晋忠伊思静卢士香山西农业大学基础部太谷030801 北京理工大学化学与化工学院北京100081

采用密度泛函理论研究了Cu掺杂及缺陷共存对ZnO光催化性能的影响.计算时考虑了富O和贫O两种掺杂条件.研究结果表明富O条件有利于Cu的掺杂,贫O条件则产生抑制作用.当Cu掺杂浓度较低时,不论在何种掺杂条件下,Cu的主要掺杂方式均为Cu_(Zn)... 详细信息

采用密度泛函理论研究了Cu掺杂及缺陷共存对ZnO光催化性能的影响.计算时考虑了富O和贫O两种掺杂条件.研究结果表明富O条件有利于Cu的掺杂,贫O条件则产生抑制作用.当Cu掺杂浓度较低时,不论在何种掺杂条件下,Cu的主要掺杂方式均为Cu_(Zn)型.当Cu掺杂浓度较高时,富O条件下以Cu_(Zn)-Cu_(Zn)型掺杂方式为主,贫O条件下Cu_(Zn)-Cu_(Zn)和Cu_(Zn)-Cui这两种掺杂方式都有可能出现.富O条件下Cu掺杂会促进V_(Zn)和O_(i)缺陷的产生,且引入的V_(Zn)和O_(i)缺陷趋向于距离Cu原子最近.Cu掺杂可有效降低ZnO的带隙宽度,且随着掺杂浓度的增加,相应模型的带隙宽度会继续降低.V_(Zn)、O_(i)和V_(O)缺陷共存使相应模型的带隙宽度有所增加.Cu掺杂及V_(Zn)、O_(i)、V_(O)缺陷共存使模型对可见光发生响应,扩展了模型对太阳光的吸收范围.对于Cu掺杂模型,富O条件下Cu_(Zn)-Cu_(Zn)是有利的光催化模型.对于缺陷共存模型,富O条件下Cu_(Zn)-Cu_(Zn)-V_(Zn)是有利的光催化模型,其次是Cu_(Zn)-V_(Zn)和Cu_(Zn)-O_(i),贫O条件下Cu_(Zn)-V_(O)是有利的光催化模型.

关键词： ZnO Cu掺杂缺陷共存密度泛函理论光催化