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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....
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...
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 ...
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...
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...
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...
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...
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 ...
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...
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...
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...
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 ...
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...
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...
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...

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