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Wen D.-E.,Science and Technology on Electromagnetic Compatibility Laboratory | Zhang Q.,Science and Technology on Electromagnetic Compatibility Laboratory | Huang X.,Science and Technology on Electromagnetic Compatibility Laboratory | Ding F.,Ship Research and Design Center | Huang X.,Kashgar University
Optik | Year: 2016

In this paper, a coplanar bandwidth-enhanced metamaterial absorber is presented based on the combination of three dual-band sub-cells. The simulated results show that the absorber is polarization insensitive and adaptive for wide angles of oblique incidence. The simulated FWHM absorption bandwidth is 1.09 GHz (6.04-7.13 GHz), with the relative FWHM absorption bandwidth of 16.6%. A sample is fabricated. The experimental results verified that FWHM absorption bandwidth is 1 GHz (6-7 GHz), with the relative FWHM absorption bandwidth of 15.4%, and the absorption peak of 77.5% is obtained. © 2016, Elsevier GmbH. All rights reserved.

Zhang S.,Bohai University | Gao X.,Kashgar University
Nonlinear Dynamics | Year: 2015

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

Zhang S.,Bohai University | Gao X.-D.,Kashgar University
Open Physics | Year: 2015

In this paper, the AKNS isospectral problem and its corresponding time evolution are generalized by embedding three coefficient functions. Starting from the generalizedAKNS isospectral problem, a mixed spectralAKNS hierarchy with variable coefficients is derived. Thanks to the selectivity of these coefficient functions, the mixed spectral AKNS hierarchy contains not only isospectral equations but also nonisospectral equations. Based on a systematic analysis of the related direct and inverse scattering problems, exact solutions of the mixed spectral AKNS hierarchy are obtained through the inverse scattering transformation. In the case of reflectionless potentials, the obtained exact solutions are reduced to n-soliton solutions. This paper shows that the AKNS spectral problem being nonisospectral is not a necessary condition to construct a nonisospectral AKNS hierarchy and that the inverse scattering transformation can be used for solving some other variable-coefficient mixed hierarchies of isospectral equations and nonisospectral equations. © 2015 S. Zhang and X.-D. Gao.

PubMed | Xinjiang Academy of Animal Science, Shandong Academy of Sciences, Kashgar University, University of Eastern Finland and 8 more.
Type: Journal Article | Journal: Molecular biology and evolution | Year: 2016

Global climate change has a significant effect on extreme environments and a profound influence on species survival. However, little is known of the genome-wide pattern of livestock adaptations to extreme environments over a short time frame following domestication. Sheep (Ovis aries) have become well adapted to a diverse range of agroecological zones, including certain extreme environments (e.g., plateaus and deserts), during their post-domestication (approximately 8-9 kya) migration and differentiation. Here, we generated whole-genome sequences from 77 native sheep, with an average effective sequencing depth of 5for 75 samples and 42for 2 samples. Comparative genomic analyses among sheep in contrasting environments, that is, plateau (>4,000m above sea level) versus lowland (<100m), high-altitude region (>1500m) versus low-altitude region (<1300m), desert (<10mm average annual precipitation) versus highly humid region (>600mm), and arid zone (<400mm) versus humid zone (>400mm), detected a novel set of candidate genes as well as pathways and GO categories that are putatively associated with hypoxia responses at high altitudes and water reabsorption in arid environments. In addition, candidate genes and GO terms functionally related to energy metabolism and body size variations were identified. This study offers novel insights into rapid genomic adaptations to extreme environments in sheep and other animals, and provides a valuable resource for future research on livestock breeding in response to climate change.

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 | Year: 2016

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.

Wu S.,Central China Normal University | Yi Y.,Yangtze University | Yu Z.,Central China Normal University | Huang X.,Central China Normal University | And 2 more authors.
Journal of Electromagnetic Waves and Applications | Year: 2016

This paper presents a zero metamaterial (ZIM) structure for the gain and directivity reinforcement of the TSA. The designed ZIM cell, which consists of resonant metal structure and inductor component, can operate at low frequencies with one component of permittivity tensor reaching zero. By changing the inductance value of the inductor component, the zero point of permittivity tensor of the ZIM will shift correspondingly. We embed ZIM cells in the typical TSA to improve the gain and directivity of TSA, making the overall structure compact, and the embedded ZIM cells have no effect on the operating frequency band of the TSA. The simulated results indicate that the gain of the TSA loaded with the ZIM cells has been enhanced by 0.9–2.48 dB, and the half-power beam width has been decreased by least 10° in the frequency range of 0.575–0.590 GHz compared with typical TSA. The measured results are well consistent with the simulated ones. The new designed antenna can be applied in the grounded-penetrating radar systems. © 2016 Informa UK Limited, trading as Taylor & Francis Group

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 | Year: 2016

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).

Qiu T.,Qingdao Technological University | Yang G.,Kashgar University | Xiong J.,Kashgar University | Xu D.,Tianjin University of Technology and Education
Optics Communications | Year: 2016

We present two schemes of Lau effect for an object, an electromagnetically induced grating generated based on the electromagnetically induced effect. The Lau interference pattern is detected either directly in the way of the traditional Lau effect measurement with a classical thermal light being the imaging light, or indirectly and nonlocally in the way of two-photon coincidence measurement with a pair of entangled photons being the imaging light. © 2016 Elsevier B.V. All rights reserved.

Wu X.-X.,Dalian University of Technology | Tursun M.,Kashgar University | Sun X.-T.,Dalian University of Technology | Wang X.-P.,Dalian University of Technology
Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology | Year: 2016

NiO, Co3O4 doped by BaCO3 are prepared by coprecipitation to be used as catalysts for N2O decomposition. It is found that the BaCo6 catalyst with the optimum composition is much more active than the series of BaxNi6 (x=0-2) catalysts. For the BaCo6 catalyst, to increase its mechanical strength, boehmite as binder is added in appropriate amount, which leads to the BaCo6Al2.3 catalyst with both better mechanical strength and desired activity for application. At 450℃, the BaCo6Al2.3 catalyst exhibits a stable catalytic activity with time on stream for the feed gas 0.2% N2O, 5% O2, 2% H2O, 0.01% NO in Ar. © 2016, Editorial Office of Journal of Dalian University of Technology. All right reserved.

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 | Year: 2016

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.

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