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Search Results: 1 - 10 of 130562 matches for " LIU Wen-yan "
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Key agreement scheme based on GDH for virtual dynamic subgroup group

LIU Wen-yan,

计算机应用 , 2007,
Abstract: Key agreement is usually mentioned in general static group.Based on virtual dynamic subgroup,Agreed Virtual Dynamic Subgroup Scheme (AVDSG) was proposed,which can manage the virtual dynamic subgroup by using the key information of the group.Compared with GDH,it can largely reduce the average cost of re-keying and the number of keys held by each user.
A New Defected Ground Structure and its Application for Miniaturized Switchable Antenna
Jingxian Liu;Wen-Yan Yin;Sailing He
PIER , 2010, DOI: 10.2528/PIER10050904
Abstract: A new defected ground structure (DGS) is firstly proposed in this paper, which has better slow-wave effect than that of cross or dumbbell one. Using the model of transmission line, its equivalent parameters are extracted. With good omni-directional properties, the proposed DGS is then used in the design of a proximity coupled antenna for its miniaturization. The size of the developed antenna is about 68% smaller than that of the conventional one. Further, two artificial cells are added on the feed line to reduce the protrudent stub length from 26.9mm to 18.94 mm. With the utility of the DGS and artificial cells, the size of proximity coupled antenna is reduced significantly. By introducing a PIN diode at the end of feed line, the antenna is switchable in both - and -direction linear polarizations. Such miniaturization in antenna size has little negative effect on its cross polarization, with both simulated and experimental results presented for comparison.
4,4′-Diazenediyldipyridinium (4-pyridyldiazenyl)pyridinium octacyanidomolybdate(V) tetrahydrate
Wen-Yan Liu,Hu Zhou,Ai-Hua Yuan
Acta Crystallographica Section E , 2008, DOI: 10.1107/s160053680802494x
Abstract: The structure of the title complex, (C10H10N4)(C10H9N4)[Mo(CN)8]·4H2O, consists of 4,4′-diazenediyldipyridinium and (4-pyridyldiazenyl)pyridinium cations disordered over the same site, an [Mo(CN)8]3 anion and four uncoordinated water molecules. The cations (crystallographic symmetry, 2) and the [Mo(CN)8]3 anion (crystallographic symmetry, 222) are arranged in an alternating fashion, forming a two-dimensional layered structure through hydrogen bonds. Hydrogen bonds, π–π stacking interactions (shortest distance = 4.7872 ) and van der Waals forces between adjacent layers generate a three-dimensional supramolecular structure.
4,4′-Diazenediyldipyridinium 4-(4-pyridyldiazenyl)pyridinium octacyanidotungstate(V) dihydrate
Su-Yan Qian,Wen-Yan Liu,Ai-Hua Yuan
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809030153
Abstract: The asymmetric unit of the title complex, (C10H10N4)(C10H9N4)[W(CN)8]·2H2O, contains two 4,4′-diazenediyldipyridinium, [H2(4,4′-azpy)]2+, two 4-(4-pyridyldiazenyl)pyridinium, [H(4,4′-azpy)]+, cations, two [WV(CN)8]3 anions, and four uncoordinated water molecules. Each of the W centers is coordinated by eight CN groups in a slightly distorted square-antiprismatic geometry. In the crystal structure, intra- and intermolecular N—H...O, N—H...N and O—H...N hydrogen bonds link the cations and anions in an alternating fashion, forming a two-dimensional layered structure, in which they are further linked through the very weak π–π stacking interactions [shortest distance = 4.640 (2) ] and van der Waals forces between adjacent layers, forming a three-dimensional supramolecular network.
Transient Responses of Some Antennas Under the Impact of an Intentionally Incident High-Power Electromagnetic Pulse
Zheng Jiang;Wen-Yan Yin;Qi-Feng Liu;Shuai Zhang
PIER , 2010, DOI: 10.2528/PIER10040701
Abstract: An improved finite difference time domain (FDTD) method is employed for fast capturing transient responses of reconfigurable and multiple-input-multiple-output (MIMO) antennas under the impact of an intentional high-power electromagnetic pulse (EMP) but with different waveforms, respectively, where lumped element and sub-cellular thin-wire algorithms and coaxial feed model are integrated together for handling such three-dimensional antennas used for wireless communication. Parametric studies are carried out to show effects of high-power EMP waveforms, its polarization state and incident direction on the transient coupled voltages on the coaxial feed line and across the diodes, with sufficient information obtained for understanding the interaction between the EMP and the antennas.
Transient Responses of Coaxial Cables in an Electrically Large Cabin with Slots and Windows Illuminated by an Electromagnetic Pulse
Jian Wang;Wen-Yan Yin;Jin-Peng Fang;Qi-Feng Liu
PIER , 2010, DOI: 10.2528/PIER10060708
Abstract: An improved finite-difference time-domain (FDTD) method is proposed for predicting transient responses of coaxial cables which are placed in an electrically large metallic cabin with arbitrary slots and circular windows on its wall. By integrating nodal analysis, multi-conductor transmission line (MTL) equation and FDTD method, we are able to accurately capture electromagnetic interference (EMI) effects on the cables. Our developed algorithm is verified by calculating frequency-dependent transfer impedance of coaxial cables together with induced currents. Numerical calculations are further performed to show the near-end coupled current responses of braided and tubular cables, respectively, and the effects of incident directions and polarizations of the illuminated electromagnetic pulse are both taken into account.
A Compact Microstrip Rat-Race Coupler with Modified Lange and T-Shaped Arms
Guo-Qing Liu;Lin-Sheng Wu;Wen-Yan Yin
PIER , 2011, DOI: 10.2528/PIER11032003
Abstract: A compact microstrip rat-race coupler is proposed with a new phase inverter which is realized by a modified Lange coupling structure with a slotted ground plane and a floating-potential conductor. Based on the evenand odd-mode theory, its parameters are generally synthesized. In order to further miniaturize the rat-race coupler, a T-shaped line is utilized. A prototype operating at 2.0 GHz is designed and fabricated for verification. The circumference of our proposed rat-race coupler is only 0.52λ. Its in-phase and out-of-phase bandwidths are also enhanced, with reasonable agreement obtained between its simulated and measured S-parameters.
Poly[bis[3,10-bis(2-hydroxyethyl)-1,3,5,8,10,12-hexaazacyclotetradecane]tetra-μ-cyanido-tetracyanidodicopper(II)molybdenum(IV)] tetrahydrate]
Hu Zhou,Ying-Ying Chen,Wen-Yan Liu,Ai-Hua Yuan
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808036131
Abstract: In the title complex, {[Cu2Mo(CN)8(C12H30N6O2)2]·4H2O}n, the polyhedron around Mo has site symmetry overline1 with a distorted square-antiprismatic shape, while the Cu atom (2 symmetry) is in a distorted axially elongated octahedral coordination environment. The uncoordinated water molecule is disordered over three sites with occupancies of 0.445 (7), 0.340 (7) and 0.215 (7). Mo and Cu atoms acting as basic components are connected by an Mo—CN—Cu—NC—Mo— linkage to form a distorted diamond-like network. Additional hydrogen bonding between the N—H groups and the water molecules stabilizes this arrangement.
Bis[tris(ethane-1,2-diamine)nickel(II)] octacyanidomolybdate(IV) dihydrate
Wen-Yan Liu,Hu Zhou,Ji-Xi Guo,Ai-Hua Yuan
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808024963
Abstract: The title complex, [NiII(C2H8N2)3]2[MoIV(CN)8]·2H2O, crystallized from a mixture of ethane-1,2-diamine (en), octacyanomolybdate(IV), [Mo(CN)8]4 , and the transition metal ion Ni2+. In the crystal structure, the Mo polyhedron has a square-antiprismatic shape, while the geometry around the Ni atom is distorted octahedral. The complex ions and water molecules are linked by hydrogen bonds.
Construction of a eukaryotic expression plasmid pcDNA3.1-HuR-FLAG and its transient expression in NIH3T3 cells
Tao LI,Wen-yan YU,Xiao-li OU,Ai-hua LIU
Medical Journal of Chinese People's Liberation Army , 2011,
Abstract: Objective To construct a eukaryotic expression vector for HuR and analyze its expression and biological function in NIH3T3 cells.Methods The total RNA was extracted from NIH3T3 cells and reverse transcribed to cDNAs.The coding region sequence of mouse HuR was then amplified by PCR and subcloned into the pcDNA3.1-FLAG plasmid.The recombinant plasmid pcDNA3.1-HuR-FLAG was verified by PCR and restriction endonuclease analysis,confirmed by DNA sequence analysis,and then transiently transfected into NIH3T3 cells with Lipofectamine LTX.The expression of HuR protein was determined by Western blotting,and the mRNA level of HuR and DUSP1 were analyzed by using real-time PCR.Result The recombinant plasmid pcDNA3.1-HuR-FLAG was correctly constructed.Twenty-four hours after transfection of the recombinant plasmid into NIH3T3 cells,the fusion protein was found to have highly expressed in the cells as revealed by Western blotting.Real-time PCR results detected that the over-expression of HuR could up-regulate the expression of DUSP1.Conclusion The eukaryotic expression vector for HuR-FLAG fusion protein has been successfully constructed and transiently expressed in NIH3T3 cells.It can be used in further analysis of the posttranscriptional regulation of DUSP1 by HuR in cancer cells.
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