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Now showing items 145 - 160 of 361

  • 2-[6,8-Dibromo-3-(4-hydroxycyclohexyl)-1,2,3,4-tetrahydroquinazolin-2-yl]-6-methoxyphenol

    Wang, Zhi-Gang   Wang, Rong   Zhang, Yi   Zhi, Feng   Yang, Yi-Lin  

    The title compound, C(21)H(24)Br(2)N(2)O(3), was synthesized by the condensation reaction of 3-methoxysalicylaldehyde with 4-(2-amino-3,5-dibromobenzylamino) cyclohexanol in a methanol solution. The dihedral angle between the two benzene rings is 76.4 (3)degrees. The cyclohexyl ring adopts a chair configuration. There is an intramolecular O-H center dot center dot center dot N hydrogen bond which affects the solid state conformation of the molecule. The crystal structure is stabilized by intermolecular O-H center dot center dot center dot O hydrogen bonds, forming chains running along the b axis.
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  • ,

    Wang, Zhi-Gang  

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  • Decay constants of the pseudoscalar charmonium and bottomonium

    Wang, Zhi-Gang   Yang, Wei-Min   Wan, Shao-Long  

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  • Some subclasses of multivalent analytic functions involving the Dziok–Srivastava operator

    Wang, Zhi-Gang   Jiang, Yue-Ping   Srivastava, H. M.  

    In the present paper, we introduce and investigate some new subclasses of multivalent analytic functions involving the Dziok-Srivastava operator. Such results as inclusion relationships, integral representations, convolution properties and integral-preserving properties for these function classes are proved. The results presented here would provide extensions of those given in earlier works. Several other new results are also obtained.
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  • with QCD sum rules

    Wang, Zhi-Gang   Yang, Wei-Min   Wan, Shao-Long  

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  • ,

    Wang, Zhi-Gang  

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  • Strong decays Bs0 -> Bs pi and Bs1 -> Bs*pi with light-cone QCD sum rules

    Wang, Zhi-Gang  

    In this article, we calculate the strong coupling constants gB(s0)B(s)eta and gB(s1)B(s)*eta with the light-cone QCD sum rules. Then we take into account the small eta-pi(0) transition matrix according to Dashen's theorem, and we obtain the small decay widths for the isospin violation processes B(s0) -> B(s)eta -> B(s)pi(0) and B(s1) -> B(s)*eta -> B(s)*pi(0). We can search the strange-bottomed (0(+), 1(+)) mesons B(s0) and B(s1) in the invariant B(s)pi(0) and B(s)*pi(0) mass distributions, respectively.
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  • Analysis of the masses and decay constants of the heavy-light mesons with QCD sum rules

    Wang, Zhi-Gang  

    In this article, we calculate the contributions of the vacuum condensates up to dimension-6 including the O(alpha(s)) corrections to the quark condensates in the operator product expansion, then we study the masses and decay constants of the pseudoscalar, scalar, vector, and axial-vector heavy-light mesons with the QCD sum rules in a systematic way. The masses of the observed mesons (D, D*), (D-s, D*(s)), (D*(0) (2400), D-1(2430)), (D*(s0)(2317), D-s1(2460)), (B, B*), (B-s, B*(s)) can be well reproduced, while the predictions for the masses of (B*(0), B-1) and (B*(s0), B-s1) can be confronted with the experimental data in the future. We obtain the decay constants of the pseudoscalar, scalar, vector, and axial-vector heavy-light mesons, which have many phenomenological applications in studying the semi-leptonic and leptonic decays of the heavy-light mesons.
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  • A Novel Controllable Hybrid-Anode AlGaN/GaN Field-Effect Rectifier with Low Operation Voltage

    Wang, Zhi-Gang   Chen, Wan-Jun   Zhang, Bo   Li, Zhao-Ji  

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  • D-s(0)(2317) as a tetraquark state with QCD sum rules in heavy quark limit

    Wang, Zhi-Gang   Wan, Shao-Long  

    In this article, we take the point of view that the charmed scalar meson D(S)0(2317) be a tetraquark state and devote to calculate its mass within the framework of the QCD sum rules approach in the heavy quark limit. The numerical values for the mass of the Ds0(2317) are consistent with the experimental data, there must be some tetraquark component in the scalar meson D(S)0(2317). Detailed discussions about the threshold parameter and Borel parameter for the multiquark states are also presented. (c) 2006 Elsevier B.V. All rights reserved.
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  • NITROGEN OXIDATION OF ETCHED MOS GATE STRUCTURE

    A method of manufacturing a metal oxide semiconductor (500). A gate structure of the metal oxide semiconductor is etched (510). A nitrogen-comprising gas, which may be NO or N 2 O, is made to flow over the metal oxide semiconductor (500). A pre-implant film (620) is grown over the edges of the gate structure. The pre-implant film may repair damage to a gate stack edge caused by an etching process. The film may be substantially silicon nitride. Beneficially, such a film may be thinner than a conventional silica oxide film. A thinner film does not deleteriously contribute to non-uniformities in a tunnel oxide. A non-uniform tunnel oxide may result in a non-uniform field between a gate and a channel. Non-uniform fields may have numerous deleterious effects. Advantageously, embodiments of the present invention overcome prior art deficiencies in repairing gate stack edge defects. In this novel manner, gate stack edge defects may be physically repaired without deleterious consequences to the electrical behavior of a metal oxide semiconductor device. The novel application of silicon nitride to this application allows thin repair layers to be grown. Advantageously, semiconductors manufactured using embodiments of the present invention may utilize smaller process feature sizes, resulting in denser arrays of semiconductor devices, resulting in lower costs for such devices and realizing a competitive advantage to practitioners of the improvements in the arts herein described.
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  • Stability analysis of multi-group deterministic and stochastic epidemic models with vaccination rate

    Wang, Zhi-Gang   Gao, Rui-Mei   Fan, Xiao-Ming   Han, Qi-Xing  

    We discuss in this paper a deterministic multi-group MSIR epidemic model with a vaccination rate, the basic reproduction number R-0, a key parameter in epidemiology, is a threshold which determines the persistence or extinction of the disease. By using Lyapunov function techniques, we show if R-0 is greater than 1 and the deterministic model obeys some conditions, then the disease will prevail, the infective persists and the endemic state is asymptotically stable in a feasible region. If R-0 is less than or equal to 1, then the infective disappear so the disease dies out. In addition, stochastic noises around the endemic equilibrium will be added to the deterministic MSIR model in order that the deterministic model is extended to a system of stochastic ordinary differential equations. In the stochastic version, we carry out a detailed analysis on the asymptotic behavior of the stochastic model. In addition, regarding the value of R-0, when the stochastic system obeys some conditions and R-0 is greater than 1, we deduce the stochastic system is stochastically asymptotically stable. Finally, the deterministic and stochastic model dynamics are illustrated through computer simulations.
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  • Globally visualizing the microtubule-dependent transport behaviors of influenza virus in live cells.

    Liu, Shu-Lin   Zhang, Li-Juan   Wang, Zhi-Gang   Zhang, Zhi-Ling   Wu, Qiu-Mei   Sun, En-Ze   Shi, Yun-Bo   Pang, Dai-Wen  

    Understanding the microtubule-dependent behaviors of viruses in live cells is very meaningful for revealing the mechanisms of virus infection and endocytosis. Herein, we used a quantum dots-based single-particle tracking technique to dynamically and globally visualize the microtubule-dependent transport behaviors of influenza virus in live cells. We found that the intersection configuration of microtubules can interfere with the transport behaviors of the virus in live cells, which lead to the changing and long-time pausing of the transport behavior of viruses. Our results revealed that most of the viruses moved along straight microtubules rapidly and unidirectionally from the cell periphery to the microtubule organizing center (MTOC) near the bottom of the cell, and the viruses were confined in the grid of microtubules near the top of the cell and at the MTOC near the bottom of the cell. These results provided deep insights into the influence of entire microtubule geometry on the virus infection. =20
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  • Roseivivax sediminis sp. nov., a moderately halophilic bacterium isolated from salt mine sediment.

    Xiao, Wei   Wang, Yong-Xia   Liu, Ji-Hui   Wang, Zhi-Gang   Zhang, Xiao-Xia   Ji, Kai-Yan   Lai, Yong-Hong   Wen, Meng-Liang   Cui, Xiao-Long  

    A Gram-negative, facultatively anaerobic, short rod-shaped, heterotrophic bacterium, designated strain YIM D21(T), was isolated from a salt mine in Yunnan province, south-west China. Strain YIM D21(T) formed cream-yellow colonies, was non-motile and moderately halophilic, and tolerated NaCl concentrations of 1-15% (w/v), with optimum growth at 5-10=E2=80=8A% (w/v). Growth occurred at 15-42 =C2=B0C (optimum 28 =C2=B0C) and at pH 6.5-8.5 (optimum 7.5-8.0). The respiratory quinone was ubiquinone-10 (Q-10). The polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, three unidentified phospholipids, one unidentified aminolipid and two unidentified lipids. The major fatty acids were C(18:1)omega7c and cyclo C(19:0)omega8c and the DNA G+C content was 67.7 mol%. Phylogenetic analyses revealed that strain YIM D21(T) belongs to the genus Roseivivax. 16S rRNA gene sequence similarities of YIM D21(T) were 95.7, 95.0 and 94.8% with the type strains of Roseivivax halodurans, Roseivivax lentus and Roseivivax halotolerans, respectively. Physiological and biochemical tests allowed phenotypic differentiation of strain YIM D21(T) from closely related species with validly published names. We therefore propose that this isolate represents a novel species, Roseivivax sediminis sp. nov.; the type strain is YIM D21(T) (=E2=80=8A=3D=E2=80=8AKCTC 23444(T)=E2=80=8A=3D=E2=80=8AACCC 10710(T)).=20
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  • Semi-leptonic B -> S decays in the standard model and in the universal extra dimension model

    Wang, Zhi-Gang  

    In this article, we assume the two nonets of scalar mesons below and above 1GeV are all q (q) over bar states, and study the semi-leptonic decays B -> Sl(-)(nu) over bar (l), B -> Sl(+)l(-) and B -> S (nu) over bar nu both in the standard model and in the universal extra dimension model using the B-Sform-factors calculated by the light-cone QCD sum rules in our previous work. We obtain the partial decay widths and decay widths, which can be confronted with the experimental data in the future to examine the natures of the scalar mesons and constrain the basic parameter in the universal extra dimension model, the compactification scale 1/R. (C) 2015 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license.
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  • weak form factor with chiral current in the light-cone sum rules

    Wang, Zhi-Gang   Zhou, Ming-Zhen   Huang, Tao  

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