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Search Results: 1 - 10 of 149002 matches for " WANG Zhi-Min "
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Tetrakis[3-(2-pyridylamino)pyridine-κN]nickel(II) diperchlorate ethanol disolvate
Zhi-Min Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808006569
Abstract: In the title compound, [Ni(C10H9N3)4](ClO4)2·2C2H5OH, the metal centre exhibits a four-coordinated environment with four pyridine N atoms of the four different dipyridylamine ligands. A twofold rotation axis passes through the Ni atom. N—H...O and N—H...N hydrogen bonds are present in the crystal structure.
Zhi-Min Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808006909
Abstract: In the title compound, [Cu2Cl4(C11H16N4)]n, the Cu atom is coordinated by two N atoms of two 3,3′,5,5′-tetramethyl-4,4′-methylenedipyrazole (H2mbdpz) ligands, two bridging Cl atoms and one terminal Cl atom, forming a square-pyramidal geometry. The bridging Cl atoms and the bridging H2mbdpz ligands connect the Cu atoms to build up an extended one-dimensional chain. The chains are further connected through N—H...Cl hydrogen bonds to build up a two-dimensional layer in the (011) plane. An inversion centre lies between every pair of adjacent Cu atoms.
Zhi-Min Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808006685
Abstract: In the title compound, [CoCl2(C12H12N2)], the CoII atom is coordinated in a tetrahedral geometry by the N atoms of two different 1,3-di-4-pyridylpropane ligands. The compound adopts a linear chain structure.
Study of blood fat concentration based on serum ultraviolet absorption spectra and neural network  [PDF]
Wei-Hua Zhu, Zhi-Min Zhao, Xin Guo, Le-Xin Wang, Hui Chen
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.26057
Abstract: Blood plays an important role in the clinical di-agnosis and treatment, the analysis of blood will be of very important practical significance. The experiment shows that the absorption spectra of blood are of serious noise in the wave band of 200 to 300 nm, which hides the useful spectral characteristics. The effective separation of the noise was achieved by db4 wavelet transform, and the signals of reconstruction have been obviously improved in the noise serious wave band, reflecting some useful information. The absorption peaks of different samples are displaced to some degrees. The correlation between absorbance at 278nm and blood fat concentration is no significant and random. Based on the evident correlation between serum absorption spectrum and blood fat con-centration in the wave band of 265 to 282nm, a neural network model was built to forecast the blood fat concentration, bringing a relatively good prediction. This provides a new spectral test method of blood fat concentration.
Zhi-Min Wang,Bo Shao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809033480
Abstract: In the title compound, C15H13N5, the dihedral angles between the central aromatic ring and and the two peripheral rings are 1.5 (6) and 33.1 (4)°. In the crystal, intermolecular N—H...N hydrogen bonds connect the molecules into a zigzag chain propagating in [100].
Steady-state bifurcations of the three-dimensional Kolmogorov problem
Zhi-Min Chen,Shouhong Wang
Electronic Journal of Differential Equations , 2000,
Abstract: This paper studies the spatially periodic incompressible fluid motion in $mathbb R^3$ excited by the external force $k^2(sin kz, 0,0)$ with $kgeq 2$ an integer. This driving force gives rise to the existence of the unidirectional basic steady flow $u_0=(sin kz,0, 0)$ for any Reynolds number. It is shown in Theorem 1.1 that there exist a number of critical Reynolds numbers such that $u_0$ bifurcates into either 4 or 8 or 16 different steady states, when the Reynolds number increases across each of such numbers.
Surface Functionalization of Multiwalled Carbon Nanotube with Trifluorophenyl
Zhi-Min Dang,Lan Wang,Li-Pei Zhang
Journal of Nanomaterials , 2006, DOI: 10.1155/jnm/2006/83583
Abstract: A new approach to dispersion of multiwalled carbon nanotube (MWNT) in common polar solvents was reported. Here, a detailed study of nanotube chemistry by using trifluorophenyl (TFP) to modify the surface of MWNT was discussed, which was not reported before. A characterization of the reaction products using a variety of techniques was provided. The results confirmed that the surface of MWNT was successfully functionalized. Furthermore, trifluorophenyl multiwalled carbon nanotube (TFP-MWNT) was well dispersed in polar solvents, such as tetrahydrofuran (THF), acetic acid (Ac), N,N-dimethyl formamide (DMF), dimethyl sulfoxide (DMSO), due to the adsorption of trifluorophenyl groups on the surface of raw MWNT. Following chemical modification, dispersed individual nanotube suggests the potentials for wide applications.
A Physics-Based Landmine Discrimination Approach with Compressive Sensing
Peng-Yu Wang;Qian Song;Zhi-Min Zhou
PIER , 2013, DOI: 10.2528/PIER12082704
Abstract: Compressive Sensing (CS) is a recently developed technique, which can reconstruct the sparse signal with an overwhelming probability, even though the signal is sampled at highly sub-Nyquist rate. Based on the observation that the electromagnetic scattering structure (ESS) of a metal landmine is composed of two scattering centers, whose geometrical parameters are tightly related to its physical dimensions, a new physics-based landmine discrimination approach is proposed in this paper. Firstly, the approach uses the Multi-Measurement Iterative Pixel Discrimination method to reconstruct the landmine's ESS in noisy environments. Secondly, the geometrical parameters of the landmine's ESS are extracted from the sparse image. Thirdly, landmine discrimination is conducted according to the measured geometrical features and apriori knowledge. Finally, the field experimental results demonstrate the effectiveness of the proposed approach.
Bis[1-(4-chlorobenzyl)pyridinium] bis(1,2,5-thiadiazole-3,4-dithiolato)nickelate(II)
Zhi-min Wang,Fang-quan Wang,Zi-yang Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681102873x
Abstract: The asymmetric unit of the salt, (C12H11ClN)2[Ni(C2N2S3)2], comprises one cation and a half of Ni(tdas)2 (tdas = 1,2,5-thiadiazole-3,4-dithiolate) anion. The NiII atom is located at a centre of inversion. The NiII atom has a square-planar coordination with Ni—S distances of 2.2052 (4) and 2.1970 (5) . In crystal, weak C—H...S and C—H...Ni contacts are observed between the anions and cations.


系统科学与数学 , 1990,
Abstract: 制导问题的研究可追朔到40年代,人们在大量飞行实践基础上总结出今天称之为经典导引规律的三点法、平行接近法、前置量法和比例导航等.60年代以来最优控制理论给制导律的研究注入新的活力,新的制导律不断出现,如预测制导、最优制导、奇异摄动制导等.同时人们也利用最优控制理论讨论了各种经典制导律的最优性.由于比例导航的实现既简单又能满足工程精度要求,所以目前仍在不少战术导弹型号上使用.虽然关
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