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Kashi, China

Zhao J.,Central China Normal University | Huang X.,Central China Normal University | Huang X.,Kashgar University | Yang H.,Central China Normal University
Applied Physics A: Materials Science and Processing

We numerically investigate the influence of curved surface on the properties of metamaterial absorber in the microwave regime. It is shown that curved surface metamaterial absorber can lead to dramatic absorption increase compared with the conventional planar structure. Simulation results demonstrate that the proposed absorber can perform absorption peaks at two resonant frequencies and one resonant frequency for the TM and TE polarizations, respectively. This simple absorber is particularly desirable for various potential applications such as improving absorbance performances. © 2016, Springer-Verlag Berlin Heidelberg. Source

Wang Q.,Tianjin Normal University | Wang Q.,Nankai University | Wang Z.,Tianjin Normal University | Yin X.,Nankai University | And 3 more authors.
Materials Research Bulletin

Supported noble metal ruthenium phosphides were synthesized by one-step H2-thermal treatment method using triphenylphosphine (TPP) as phosphorus sources at low temperatures. Two phosphides RuP and Ru2P can be prepared by this method via varying the molar ratio of metal salt and TPP. The as-prepared phosphides were characterized by X-ray powder diffraction (XRD), low-temperature N2 adsorption, CO chemisorption and transmission electronic microscopy (TEM). The supported ruthenium phosphides prepared by new method and conventional method together with contradistinctive metallic ruthenium were evaluated in hydrodesulfurization (HDS) of dibenzothiophene (DBT). The catalytic results showed that metal-rich Ru2P was the better active phase for HDS than RuP and metal Ru. Besides this, ruthenium phosphide catalyst prepared by new method exhibited superior HDS activity to that prepared by conventional method. © 2015 Elsevier Ltd. Source

Qiu T.,Qingdao Technological University | Xia L.,Kashgar University | Ma H.,Qingdao Technological University | Zheng C.,Qingdao Technological University | Chen L.,Qingdao Technological University
Optics Communications

The electromagnetically induced Talbot effect offers a nondestructive and lensless way to image ultracold atoms or molecules (Wen et al., 2011 [12]). In this paper, we propose another atomic imaging scheme based on the holographic imaging principle, in which three types of light source are employed as the imaging light to perform spatial interference. Compared to the previous self-imaging scheme, in the present one both the amplitude and phase information of the object can be imaged with the characteristic of arbitrarily controllable image variation in size, and the object to be imaged is no longer subject to the periodic structure. © 2015 Elsevier B.V. All rights reserved. Source

Zhang S.,Bohai University | Gao X.,Kashgar University
Nonlinear Dynamics

Based on the corresponding bilinear forms, we obtain one-, two- and three-soliton solutions of a new AKNS equation with time-dependent coefficients by using Hirota’s bilinear method. From these obtained solutions, uniform formulae of exact N-soliton solutions of the AKNS equation are summarized. It is graphically shown that the dynamical evolutions of such soliton solutions with time-dependent functions of the AKNS equation possess time-varying speeds and amplitudes in the process of propagations. © 2015 Springer Science+Business Media Dordrecht Source

Yao W.,Central China Normal University | Yang H.,Central China Normal University | Huang X.,Central China Normal University | Huang X.,Kashgar University | And 2 more authors.
AIP Advances

We present a novel parabolic antenna by employing reflection gradient metasurface which is composed of a series of circle patches on a grounded dielectric substrate. Similar to the traditional parabolic antenna, the proposed antenna take the metasurface as a "parabolic reflector" and a patch antenna was placed at the focal point of the metasurface as a feed source, then the quasi-spherical wave emitted by the source is reflected and transformed to plane wave with high efficiency. Due to the focus effect of reflection, the beam width of the antenna has been decreased from 85.9° to 13° and the gain has been increased from 6.5 dB to 20.8 dB. Simulation and measurement results of both near and far-field plots demonstrate good focusing properties of the proposed parabolic antenna. © 2016 Author(s). Source

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