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Search Results: 1 - 10 of 76047 matches for " Yang Jing-Jing "
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Jing-Jing Yang,Jun Zhao
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811045545
Abstract: In the title compound, [Cd(C11H7N6)2(H2O)2], the CdII cation is located on an inversion center and is coordinated by four N atoms from two 5-(pyrazin-2-yl)-3-(pyridin-3-yl)-1,2,4-triazolide anions and two water molecules in a distorted octahedral geometry. The triazolide ligand is nearly planar: the central triazole ring is oriented at dihedral angles of 4.63 (13) and 8.41 (13)° with respect to the pyrazine and pyridine rings. Intermolecular O—H...N hydrogen bonds link the molecules into a two-dimensional supramolecular network parallel to (001).
Bing-Yu Zhang,Qian Yang,Jing-Jing Nie
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807062770
Abstract: In the crystal strucuture of the title compound, C5H5N3O, which was obtained upon recrystallization of 2-cyanopyrimidine from aqueous sodium hydroxide, the amide group is twisted with respect to the aromatic ring by 24.9 (1)°. π–π stacking is observed between partially overlapped rings at a face-to-face separation of 3.439 (6) . The structure features a centrosymmetric pair of intermolecular N—H...O hydrogen bonds. Another N—H...O hydrogen bond between adjacent molecules links them into a helical chain motif.
Bing-Yu Zhang,Qian Yang,Jing-Jing Nie
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807060977
Abstract: The title compound, [Cu(C5H3N2O2)2], was prepared in a water–ethanol solution containing 2-cyanopyrimidine, malonic acid and copper(II) nitrate trihydrate. The CuII ion, located on an inversion center, is chelated by two pyrimidine-2-carboxylate anions in a CuO2N2 square-planar geometry. The uncoordinated carboxylate O atom and pyrimidine N atoms are linked to adjacent pyrimidine rings via weak C—H...O and C—H...N hydrogen bonding. π–π Stacking is observed between nearly parallel pyrimidine rings, the centroid-to-centroid separation being 3.8605 (13) .
Arbitrary Shape Electromagnetic Transparent Device Based on Laplace’s Equation
Jing-jing Yang,Ming Huang,Cheng-fu Yang,Ji-hong Shi
Radioengineering , 2011,
Abstract: Transparent device is deliberately-designed electromagnetic structure that is transparent to electromagnetic wave. It can be used as a radome structure which is capable of protection antenna inside without sacrificing its performance. In this paper, two-dimensional (2D) arbitrary shape electromagnetic transparent device is designed based on transformation optics. Laplace’s equation is adopted to construct the coordinate mapping between the original space and the transformed space. The design method is flexibly extended to three-dimensional (3D) case, which greatly enhances the applicability of transparent device. The protection of a horn antenna is taken as an example to show the effectiveness of the transparent device. Since the performance of the transparent device is independent on the inner antenna, it can be designed separately. Full-wave simulations are made to validate the results.
A Microring Resonator Based Negative Permeability Metamaterial Sensor
Jun Sun,Ming Huang,Jing-Jing Yang,Ting-Hua Li,Yao-Zhong Lan
Sensors , 2011, DOI: 10.3390/s110808060
Abstract: Metamaterials are artificial multifunctional materials that acquire their material properties from their structure, rather than inheriting them directly from the materials they are composed of, and they may provide novel tools to significantly enhance the sensitivity and resolution of sensors. In this paper, we derive the dispersion relation of a cylindrical dielectric waveguide loaded on a negative permeability metamaterial (NPM) layer, and compute the resonant frequencies and electric field distribution of the corresponding Whispering-Gallery-Modes (WGMs). The theoretical resonant frequency and electric field distribution results are in good agreement with the full wave simulation results. We show that the NPM sensor based on a microring resonator possesses higher sensitivity than the traditional microring sensor since with the evanescent wave amplification and the increase of NPM layer thickness, the sensitivity will be greatly increased. This may open a door for designing sensors with specified sensitivity.
Scanning tunnelling microscope investigation of the TiSi2 nano-islands on Sr/Si(100) surface

Yang Jing-Jing,Du Wen-Han,

物理学报 , 2011,
Abstract: 为了解半导体衬底与氧化物之间存在的相互作用,以及量子尺寸效应对不同再构体的影响,制备了1—2个原子层厚的TiSi2/Si(100)纳米岛,并使用扫描隧道显微镜(STM)表征手段详细地研究了TiSi2 /Si(100)纳米岛的电子和几何特性. 结果发现:这些纳米岛表面显示出明显的金属性;其空态STM图像具有典型的偏压依赖性:在高偏压下STM 图像由三聚物形成的单胞构成,并在低偏压下STM 图像显示为密堆积的图案,这些不同的图案反映出不同能量位的态密度有明显差异.
Kinetic property analysis of emergent behaviors in Swarm model

Wu Yu,Yang Jing-Jing,Wang Li,

物理学报 , 2011,
Abstract: Emergence is one of the important characteristics of complex systems. At present, there is no definite conclusion on what emergence is and how it happens. Swarm model is selected for theoretical research. For convenience of doing so, its specific definition is given, and then the kinetic properties of this model are analyzed. By viewing the energy property, it is proven that under special circumstances the mean square deviation of each kinetic parameter would fall into a certain value space. Experimental results show that under certain conditions, by setting the initial state and parameters of the control equations, the behavior of Swarm can be effectively constrained.
Two neuron system with an inertial term to exhibit transient chaos

ZHANG Jing-jing,YANG Xiao-song,

重庆邮电大学学报(自然科学版) , 2005,
Abstract: 发现了有惯性项的二元神经网络系统存在暂态混沌,并用相图及短期Lyapunov指数说明了此暂态混沌的存在。给出了理论证明和计算方法,其结果很容易扩展到高维系统。 
Delay-constrained minimum cost multicast tree algorithm

YANG Chun-de,REN Jing-jing,

计算机应用 , 2009,
Abstract: Based on the Random Selective Tree Node First (RSTF) algorithm that constructs minimum cost multicast tree and considering the delay of the network, this paper presented a new algorithm constructing delay-constrained minimum cost multicast tree. The simulation about random network model shows that compared with KPP the new algorithm has better performance in terms of cost and time delay.
Xi-Zai Zhao,Jing-Jing Jia,Miao Ou-Yang,Fu-Ping Huang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811001474
Abstract: The title multifunctional twisted organic ligand, C10H10N4S2, contains a short C=S bond [1.671 (2) ]. The dihedral angle between the two pyrazine rings is 39.83 (6)°. In the crystal, intermolecular C—H...N and C—H...S hydrogen bonds result in the formation of a supramolecular network.
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