搜索结果: 1-15 共查到“知识库 表与界面物理学”相关记录39条 . 查询时间(3.76 秒)
基于超材料角反射面的高增益高效率双圆极化Fabry-Perot天线设计
超材料角反射面 Fabry-Perot天线 高增益 高口径效率 太阳射电望远镜
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2022/3/24
基于射线跟踪模型,提出了一种超材料角反射面结构,实现了Fabry-Perot天线增益和口径效率的提升.首先对基于超材料角反射面的Fabry-Perot天线进行了理论推导和分析.然后,设计并分析了双圆极化馈源、基于超材料角反射面的Fabry-Perot天线及其性能.最后,对所提出的Fabry-Perot天线模型进行了制造和测试.结果表明,该天线的左圆极化增益和右圆极化增益分别为21.4dBi和21....
重庆稻田水/气界面汞释放通量及其影响因素
重庆稻田 水/气界面 汞释放通量 影响因素
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2013/8/14
水稻作为一种非常重要的粮食作物, 是世界上超过一半以上人口的主要食物来源, 其种植面积仅次于小麦, 占全球耕地面积的11%. 同时, 水稻田也是世界上第二大湿地生态系统. 水稻田土壤的汞污染问题越来越受到人们的重视, 特别是近期发现汞矿区稻米也可以像鱼类一样对汞进行积累, 进而通过食物链对其富集放大, 从而影响人体健康和生态安全. 而水稻田水-气界面汞交换无疑是全球汞生物地球化学循环的一个重要组成...
Quantum criticality in disordered bosonic optical lattices
Quantum criticality disordered bosonic optical lattices
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2010/11/25
Using the exact Bose-Fermi mapping, we study universal properties of ground-state density distributions and finite-temperature quantum critical behavior of one-dimensional hard-core bosons in trapped ...
Lifshitz Transition and Quantum Criticality in an Extended Periodic Anderson Model
Lifshitz Transition Quantum Criticality Extended Periodic Anderson Model
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2010/11/25
We study the quantum phase transition in f-electron systems as a quantum Lifshitz transition
driven by selective Mott localization in a realistic extended Anderson lattice model. Using DMFT,we find t...
Influence of Rotations on the Critical State of Soil Mechanics
Influence of Rotations Critical State of Soil Mechanics
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2010/11/25
The ability of grains to rotate can play a crucial role on the collective behavior of granular media. It has been observed in computer simulations that imposing a torque at the contacts modi es the fo...
Eliashberg theory for ferromagnetic quantum criticality in the surface of three dimensional topological insulators
Eliashberg theory ferromagnetic quantum dimensional topological insulators
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2010/11/25
We develop an Eliashberg theory for ferromagnetic quantum criticality in the surface of three
dimensional topological insulators. A novel ingredient of the present study is to introduce an
anomalous...
Surface Majorana Cone of the Superfluid $^3$He B Phase
superfluid 3He surface Andreev bound states Majorana fermions Majorana cone
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2010/11/25
The superfluid 3He B phase, one of the oldest unconventional fermionic condensates xperimentally realized, is recently predicted to support Majorana fermion surface states. Majorana fermion,which is c...
Anisotropic upper critical field and a possible Fulde-Ferrel-Larkin-Ovchinnikov state in a stoichiometric pnictide superconductor LiFeAs
Anisotropic upper critical field possible Fulde-Ferrel-Larkin-Ovchinnikov state
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2010/11/25
Measurements of the temperature and angular dependencies of the upper critical fields Hc2 of a
stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel ...
Hierarchy of boundary driven phase transitions in multi-species particle systems
Hierarchy of boundary driven phase transitions multi-species particle systems
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2010/11/23
Interacting systems with K driven particle species on a open chain or chains which are coupled at the ends to boundary reservoirs with fixed particle densities are considered. We classify discontinuou...
Critical behavior of ferromagnetic pure and random diluted nanoparticles with competing interactions: variational and Monte Carlo approaches
Critical behavior of ferromagnetic pure random diluted nanoparticles interactions: variational
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2010/11/23
The magnetic properties and critical behavior of both ferromagnetic pure and metallic nanopar-
ticles having concurrently atomic disorder, dilution and competing interactions, are studied in the fram...
Anisotropic superfluidity in a dipolar Bose gas
Anisotropic superfluidity dipolar Bose gas
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2010/11/22
We study the superfluid character of a dipolar Bose-Einstein condensate (DBEC) in a quasi-two
dimensional (q2D) geometry. In particular, we allow for the dipole polarization to have some non-zero pro...
Propagating Waves in a Monolayer of Gas-Fluidized Rods
Propagating Waves Monolayer of Gas-Fluidized Rods
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2010/11/22
We report on an observation of propagating compression waves in a quasi-two-dimensional onolayer of apolar granular rods uidized by an up ow of air. The collective wave speed is an order of magnitude ...
Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se
Large bulk resistivity surface quantum oscillations
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2010/11/22
Topological insulators are predicted to present novel surface transport phenomena, but their
experimental studies have been hindered by a metallic bulk conduction that overwhelms the surface transpor...
Stiffness of Contacts Between Rough Surfaces
Stiffness of Contacts Rough Surfaces
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2010/11/18
The effect of self-affine roughness on solid contact is examined with molecular dynamics and
continuum calculations. The contact area and normal and lateral stiffnesses rise linearly with the applied...
Interaction anisotropy and random impurities effects on the critical behaviour of ferromagnets
Interaction anisotropy random impurities effects critical behaviour of ferromagnets
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2010/11/23
The theory of phase transitions is based on the consideration of "idealized" models, such as the Ising model: a system of magnetic moments living on a cubic lattice and having only two accessible stat...