检索结果-内蒙古大学图书馆

IEEE AESS European Conference on Satellite Telecommunications (ESTEL)

作者： Runle Du Jiaqi Liu Yonghai Wang Yizhong Fang Gang Meng National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

When multiple flying vehicles collaborate in locating a target, their formation design is an important factor to the error of location. Based on the analyses of contribution that formation design made to the location error, Effective Observing Area is defined as a criterion to assess formation design. An evaluation method for formation design is then proposed in this paper, which can serve as a guide in further formation design. Digital simulation results have proved the effectiveness and correct of this concept.

关键词： Vectors Target tracking Algorithm design and analysis Space vehicles Extraterrestrial measurements

来源：评论

学校读者我要写书评

暂无评论

A Conservative Lagrangian Scheme for Solving Compressible Fluid Flows with Multiple Internal Energy Equations

引用

Communications in Computational physics 2012年第10期12卷 1307-1328页

作者： Juan Cheng Chi-Wang Shu Qinghong Zeng National Key Laboratory of Science and Technology on Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Division of Applied Mathematics Brown UniversityProvidenceRI 02912USA Institute of Applied Physics and Computational Mathematics Beijing 100088China

Lagrangianmethods arewidely used inmany fields formulti-material compressible flow simulations such as in astrophysics and inertial confinement fusion(ICF),due to their distinguished advantage in capturing material interfaces *** some of these applications,multiple internal energy equations such as those for electron,ion and radiation are *** the past decades,several staggeredgrid based Lagrangian schemes have been developed which are designed to solve the internal energy equation *** schemes can be easily extended to solve problems with multiple internal energy *** such schemes are typically not conservative for the total ***,significant progress has been made in developing cell-centered Lagrangian schemes which have several good properties such as conservation for all the conserved variables and easiness for ***,these schemes are commonly designed to solve the Euler equations in the form of the total energy,therefore they cannot be directly applied to the solution of either the single internal energy equation or the multiple internal energy equations without significant *** modifications,if not designed carefully,may lead to the loss of some of the nice properties of the original schemes such as conservation of the total *** this paper,we establish an equivalency relationship between the cell-centered discretizations of the Euler equations in the forms of the total energy and of the internal *** a carefully designed modification in the implementation,the cell-centered Lagrangian scheme can be used to solve the compressible fluid flow with one or multiple internal energy equations and meanwhile it does not lose its total energy conservation *** advantage of this approach is that it can be easily applied to many existing large application codes which are based on the framework of solving multiple internal energy *** two dimensional numerical examp

关键词： Lagrangian scheme conservative cell-centered internal energy equation compressible fluid flow three-temperaturemodel

来源：评论

学校读者我要写书评

暂无评论

The role of single loading dielectric layer on properties of frequency selective surfaces

The role of single loading dielectric layer on properties of...

引用

International Workshop on Metamaterials

作者： S. J. Zhang J. Q. Liu M. L. Wang W. M. Ms W. Liang X. M. Liu X. C. Hou National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Aerospace Science & Industry Defense Technology R & T Center

Frequency selective surfaces (FSS) have attracted researchers from many subjects for decades for its tempting applications such as for radome radar cross section (RCS) reduction, sub-reflector, ***. Many studies was focused on different type FSS, such as unit shape, dielectric loading, layers of FSS. And it is of popular consideration that double dielectric loading on both sides of FSS be an ideal configuration. In this paper, the type of single side loading, which is more similar to the practical configuration, was studied with the numerical method. And it is found that both the thickness of thick loading layer and the constant of the thin substrate play key roles to the properties of FSS.

关键词： Frequency selective surfaces Dielectrics Substrates Loading Load modeling Frequency modulation Equivalent circuits

来源：评论

学校读者我要写书评

暂无评论

FSS design research for improving the wide-band stealth performance of radar absorbing materials

FSS design research for improving the wide-band stealth perf...

引用

International Workshop on Metamaterials

作者： Wang Ming-liang Zhang Sheng-jun Liu Jia-qi Liang Wei Liu Xue-mei X. W. Liang National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematical Beijing China

The frequency selective surface (FSS) is designed to improve the wide-band stealth performance of radar absorbing materials (RAM) at the frequency range from 2GHz to 12GHz. The FSS element structure is designed for thin RAM coating, and the electromagnetic wave reflectivity performance of RAM containing FSS is analyzed by using the numerical simulation. The influence of FSS design parameters on the reflectivity of RAM is researched, and the FSS design parameters include the element geometry parameter, the length of the array periods, and the permittivity of substrate material. The research results show that the three absorbing wide-bands can appear and that the reflectivity is lower than -10dB, so the wide-band stealth performance of RAM containing FSS can be improved at the frequency range from 2GHz to 12GHz.

关键词： Frequency selective surfaces Random access memory Reflectivity Resonant frequency Arrays Substrates

来源：评论

学校读者我要写书评

暂无评论

Effects of discharge types on plasma collisional absorption of electromagnetic waves

Effects of discharge types on plasma collisional absorption ...

引用

International Workshop on Metamaterials

作者： Runhui Wu Shengjun Zhang Jiaqi Liu Aimin Ren Gang Meng Wei Liang Xuemei Liu National Key Laboratory of Science and Technology on test physics & numerical mathematical Beijing China

In this paper, the collisional absorption mechanism of electromagnetic wave in plasma of different types is studied with numerical methods. The collision frequency and electromagnetic wave which is made by RF discharge in the obturator or DC discharge around the opening space. The computation models are founded for calculating the absorption by the plasma. The FDTD method is presented for simulating the collisional absorption of electromagnetic wave power for one-dimensional homogeneous/inhomogeneous plasma. The emulational results illustrate that there are two conclusions: 1) the homogeneous plasma which is produced by RF discharge in the obturator on collisional absorption of electromagnetic wave can absorb the energy of electromagnetic wave effectively in the finite bandwidth; 2) the inhomogeneous plasma which is produced by DC discharge around the opening space can absorb the energy of electromagnetic wave availably both in the wide bandwidth and from low-frequency to high-frequency.

关键词： Plasmas Discharges (electric) Absorption Radio frequency Nonhomogeneous media Electromagnetic scattering Attenuation

来源：评论

学校读者我要写书评

暂无评论

Summer Persistence Barrier of Sea Surface Temperature Anomalies in the Central Western North Pacific

引用

Advances in Atmospheric sciences 2012年第6期29卷 1159-1173页

作者：赵霞李建平张文君 Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Science State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences Nanjing University of Information Science and Technology

The persistence barrier of sea surface temperature anomalies （SSTAs） in the North Pacific was investigated and compared with the ENSO spring persistence barrier. The results show that SSTAs in the central western North Pacific （CWNP） have a persistence barrier in summer： the persistence of SSTAs in the CWNP shows a significant decline in summer regardless of the starting month. Mechanisms of the summer persistence barrier in the CWNP are different from those of the spring persistence barrier of SSTAs in the central and eastern equatorial Pacific. The phase locking of SSTAs to the annual cycle does not explain the CWNP summer persistence barrier. Remote ENSO forcing has little linear influence on the CWNP summer persistence barrier, compared with local upper-ocean process and atmospheric forcing in the North Pacific. Starting in wintertime, SSTAs extend down to the deep winter mixed layer then become sequestered beneath the shallow summer mixed layer, which is decoupled from the surface layer. Thus, wintertime SSTAs do not persist through the following summer. Starting in summertime, persistence of summer SSTAs until autumn can be explained by the atmospheric forcing through a positive SSTAs-cloud/radiation feedback mechanism because the shallow summertime mixed layer is decoupled from the temperature anomalies at depth, then the following autumnwinter-spring, SSTAs persist. Thus, summer SSTAs in the CWNP have a long persistence, showing a significant decline in the following summer. In this way, SSTAs in the CWNP show a persistence barrier in summer regardless of the starting month.

关键词： SST anomalies persistence barrier oceanic mixed layer atmospheric forcing positive cloudfeedback on SSTAs

来源：评论

学校读者我要写书评

暂无评论

Quantum nonlocality of massive qubits in a moving frame

引用

Physical Review A 2013年第2期88卷 022124-022124页

作者： Hong-Yi Su Yu-Chun Wu Jing-Ling Chen Chunfeng Wu L. C. Kwek Theoretical Physics Division Chern Institute of Mathematics Nankai University Tianjin 300071 People's Republic of China Key Laboratory of Quantum Information University of Science and Technology of China 230026 Hefei People's Republic of China Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore 117543 Pillar of Engineering Product Development Singapore University of Technology and Design 20 Dover Drive Singapore 138682 National Institute of Education and Institute of Advanced Studies Nanyang Technological University 1 Nanyang Walk Singapore 637616 Institute of Advanced Studies Nanyang Technological University 60 Nanyang View Singapore 639673

We perform numerical tests on the quantum nonlocality of two-level quantum systems (qubits) observed by a uniformly moving observer. Under a suitable momentum setting, the quantum nonlocality of two-qubit nonmaximally entangled states could be weakened drastically by the Lorentz transformation, allowing for the existence of local-hidden-variable models, whereas three-qubit genuinely entangled states are robust. In particular, the generalized Greenberger-Horne-Zeilinger state remains nonlocal under arbitrary Wigner rotation and the generalized W state could admit local-hidden-variable models within a rather narrow range of parameters.

关键词： QUBITS QUANTUM entanglement QUANTUM states WIGNER rotation matrix PARAMETER estimation LORENTZ transformations

来源：评论

学校读者我要写书评

暂无评论

test of the hadronic interaction model EPOS-LHC and QGSJETII-04 with Tibet EAS core data 33

Test of the hadronic interaction model EPOS-LHC and QGSJETII...

引用

33rd International Cosmic Rays Conference, ICRC 2013

作者： Amenomori, M. Bi, X.J. Chen, D. Chen, T.L. Chen, W.Y. Cui, S.W. Danzengluobu Ding, L.K. Feng, C.F. Feng, Zhaoyang Feng, Z.Y. Gou, Q.B. Guo, Y.Q. He, H.H. He, Z.T. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Hu, X.B. Huang, J. Jia, H.Y. Jiang, L. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. Kozai, M. Labaciren Le, G.M. Li, A.F. Li, H.J. Li, W.J. Liu, C. Liu, J.S. Liu, M.Y. Lu, H. Meng, X.R. Mizutani, K. Munakata, K. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Ozawa, S. Qian, X.L. Qu, X.B. Saito, T. Saito, T.Y. Sakata, M. Sako, T.K. Shao, J. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wu, H.R. Xue, L. Yamamoto, Y. Yang, Z. Yasue, S. Yuan, A.F. Yuda, T. Zhai, L.M. Zhang, H.M. Zhang, J.L. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhang, Ying Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki036-8561 Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China Department of Mathematics and Physics Tibet University Lhasa850000 China Department of Physics Hebei Normal University Shijiazhuang050016 China Department of Physics Shandong University Jinan250100 China Institute of Modern Physics SouthWest Jiaotong University Chengdu610031 China Faculty of Engineering Kanagawa University Yokohama221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya321-8505 Japan Department of Physics Konan University Kobe658-8501 Japan Research Institute for Science and Engineering Waseda University Tokyo169-8555 Japan Faculty of Engineering Yokohama National University Yokohama240-8501 Japan Department of Physics Shinshu University Matsumoto390-8621 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa277-8582 Japan School of Information Science and Engineering Shandong Agriculture University Taian271018 China Saitama University Saitama338-8570 Japan National Institute of Informatics Tokyo101-8430 Japan Sakushin Gakuin University Utsunomiya321-3295 Japan College of Science China University of Petroleum Qingdao266555 China Tokyo Metropolitan College of Industrial Technology Tokyo116-8523 Japan Max-Planck-Institut für Physik MünchenD-80805 Germany College of Industrial Technology Nihon University Narashino275-8576 Japan Shonan Institute of Technology Fujisawa251-8511 Japan Japan Atomic Energy Agency Tokai-mura319-1195 Japan School of General Education Shinshu University Matsumoto390-8621 Japan

ISBN: (纸本)9788589064293

A hybrid experiment has been started by The Tibet ASγ collaboration at Tibet, China. It consists of a burst-detector-grid (YAC, Yangbajing Air Shower Core array) and the Tibet air-shower array (Tibet-III). The Tibet-III array is used to measure the total energy and the arrival direction of the air-showers, and YAC-I observes high energy electromagnetic particles in air-shower cores. By comparing the MC data with our experimental data, we examine hadronic interaction models currently used for air-shower simulation code CORSIKA(ver.7.3500), especially EPOS-LHC(ver.3400) and QGSJETII-04. In this paper, the preliminary results on the interaction model check at *10 TeV energy region is reported using YAC-I data taken from May 1st 2009 through February 23rd 2010 with the effective live time 152.16 days. © 2013 Sociedade Brasileira de Fisica. All Rights Reserved.

关键词： Cosmic rays

来源：评论

学校读者我要写书评

暂无评论

Progress report on the MD-A under TIBET III array 33

Progress report on the MD-A under TIBET III array

引用

33rd International Cosmic Rays Conference, ICRC 2013

作者： Amenomori, M. Bi, X.J. Chen, D. Chen, T.L. Chen, W.Y. Cui, S.W. Danzengluobu Ding, L.K. Feng, C.F. Feng, Zhaoyang Feng, Z.Y. Gou, Q.B. Guo, Y.Q. He, H.H. He, Z.T. Hibino, K. Hotta, N. Haibing, Hu Hu, H.B. Huang, J. Jia, H.Y. Jiang, L. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. Kozai, M. Labaciren Le, G.M. Li, A.F. Li, H.J. Li, W.J. Liu, C. Liu, J.S. Liu, M.Y. Lu, H. Meng, X.R. Mizutani, K. Munakata, K. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Ozawa, S. Qian, X.L. Qu, X.B. Saito, T. Saito, T.Y. Sakata, M. Sako, T.K. Shao, J. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wu, H.R. Xue, L. Yamamoto, Y. Yang, Z. Yasue, S. Yuan, A.F. Yuda, T. Zhai, L.M. Zhang, H.M. Zhang, J.L. Zhang, X.Y. Zhang, Y. Zhang, Y.I. Zhang, Ying Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki036-8561 Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China Department of Mathematics and Physics Tibet University Lhasa850000 China Department of Physics Hebei Normal University Shijiazhuang050016 China Department of Physics Shandong University Jinan250100 China Institute of Modern Physics SouthWest Jiaotong University Chengdu610031 China Faculty of Engineering Kanagawa University Yokohama221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya321-8505 Japan Department of Physics Konan University Kobe658-8501 Japan Research Institute for Science and Engineering Waseda University Tokyo169-8555 Japan Faculty of Engineering Yokohama National University Yokohama240-8501 Japan Department of Physics Shinshu University Matsumoto390-8621 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa277-8582 Japan School of Information Science and Engineering Shandong Agriculture University Taian271018 China Saitama University Saitama338-8570 Japan National Institute of Informatics Tokyo101-8430 Japan Sakushin Gakuin University Utsunomiya321-3295 Japan College of Science China University of Petroleum Qingdao266555 China Tokyo Metropolitan College of Industrial Technology Tokyo116-8523 Japan Max-Planck-Institut für Physik MünchenD-80805 Germany College of Industrial Technology Nihon University Narashino275-8576 Japan Shonan Institute of Technology Fujisawa251-8511 Japan Japan Atomic Energy Agency Tokai-mura319-1195 Japan School of General Education Shinshu University Matsumoto390-8621 Japan

ISBN: (纸本)9788589064293

The underground muon detector array of 4500m2(5 modules) is constructed underneath the Tibet ASγ experiment, improving the γ/P separation ability and then the sensitivity for gamma ray observation around 100 TeV. Each module of the muon detector is a large water tank with PMTs in the center, using water Cherenkov technique to obtain the muon signal. In one module (MD-A), the large Tyvek bag is employed filled with high-purity water keeping long-term stability of the water quality. The test run data of MD-A have shown the detector has good position uniformity, and the muon signal can be clearly separated from the noises. In this paper, the design and performance of the detector are presented. © 2013 Sociedade Brasileira de Fisica. All Rights Reserved.

关键词： Gamma rays

来源：评论

学校读者我要写书评

暂无评论

Probe of the Solar Magnetic Field Using the “Cosmic-Ray Shadow” of the Sun

引用

Physical Review Letters 2013年第1期111卷 011101-011101页

作者： M. Amenomori X. J. Bi D. Chen T. L. Chen W. Y. Chen S. W. Cui Danzengluobu L. K. Ding C. F. Feng Zhaoyang Feng Z. Y. Feng Q. B. Gou Y. Q. Guo K. Hakamada H. H. He Z. T. He K. Hibino N. Hotta Haibing Hu H. B. Hu J. Huang H. Y. Jia L. Jiang F. Kajino K. Kasahara Y. Katayose C. Kato K. Kawata Labaciren G. M. Le A. F. Li H. J. Li W. J. Li C. Liu J. S. Liu M. Y. Liu H. Lu X. R. Meng K. Mizutani K. Munakata H. Nanjo M. Nishizawa M. Ohnishi I. Ohta H. Onuma S. Ozawa X. L. Qian X. B. Qu T. Saito T. Y. Saito M. Sakata T. K. Sako J. Shao M. Shibata A. Shiomi T. Shirai H. Sugimoto M. Takita Y. H. Tan N. Tateyama S. Torii H. Tsuchiya S. Udo H. Wang H. R. Wu L. Xue Y. Yamamoto Z. Yang S. Yasue A. F. Yuan T. Yuda L. M. Zhai H. M. Zhang J. L. Zhang X. Y. Zhang Y. Zhang Yi Zhang Ying Zhang Zhaxisangzhu X. X. Zhou Department of Physics Hirosaki University Hirosaki 036-8561 Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics SouthWest Jiaotong University Chengdu 610031 China Department of Natural Science and Mathematics Chubu University Kasugai 487-8501 Japan Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Department of Physics Konan University Kobe 658-8501 Japan Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan School of Information Science and Engineering Shandong Agriculture University Taian 271018 China Saitama University Saitama 338-8570 Japan National Institute of Informatics Tokyo 101-8430 Japan Sakushin Gakuin University Utsunomiya 321-3295 Japan Tokyo Metropolitan College of Industrial Technology Tokyo 116-8523 Japan Max-Planck-Institut für Physik München D-80805 Germany College of Industrial Technology Nihon University Narashino 275-8576 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Japan Atomic Energy Agency Tokai-mura 319-1195 Japan School of General Education Shinshu University Matsumoto 390-8621 Japan

We report on a clear solar-cycle variation of the Sun’s shadow in the 10 TeV cosmic-ray flux observed by the Tibet air shower array during a full solar cycle from 1996 to 2009. In order to clarify the physical implications of the observed solar cycle variation, we develop numerical simulations of the Sun’s shadow, using the potential field source surface model and the current sheet source surface (CSSS) model for the coronal magnetic field. We find that the intensity deficit in the simulated Sun’s shadow is very sensitive to the coronal magnetic field structure, and the observed variation of the Sun’s shadow is better reproduced by the CSSS model. This is the first successful attempt to evaluate the coronal magnetic field models by using the Sun’s shadow observed in the TeV cosmic-ray flux.

关键词： SOLAR magnetic fields SPACE probes COSMIC ray showers SUN SOLAR cycle COMPUTER simulation CURRENT sheets (Electricity)

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：