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Search Results: 1 - 10 of 169098 matches for " Hong-Yan Wang "
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Study on synchrony of two uncoupled neurons under the neuron’s membrane potential stimulation  [PDF]
Yue-Ping Peng, Jue Wang, Quan-Xing Miao, Hong-Yan Lu
Journal of Biomedical Science and Engineering (JBiSE) , 2010, DOI: 10.4236/jbise.2010.32021
Abstract: The input current of two uncoupled Hindmarsh-Rose neurons under different initial conditions is modulated by the membrane potential of the Hindmarsh- Rose neuron; and the synchronization characteristics of the two uncoupled neurons are discussed by analyzing their membrane potentials and their inter spike interval (ISI) distribution. Under the stimulation of the neuron’s membrane potential whose discharge pattern is period or the chaos, the two uncoupled neurons under different initial conditions, whose parameter r (the parameter r is related to the membrane penetration of calcium ion, and reflects the changing speed of the slow adaptation current) is different or the same, can realize the full synchronization (state synchronization) or discharge synchronization (phase synchronization), and can only be synchronized to the discharge pattern of the stimulation neuron. The synchronization characteristics are mainly related to the discharge pattern and the strength of the stimulation neuron’s membrane potential, and are little related to the parameter r and the initial state of the two uncoupled neurons. This investigation shows the characteristics of the neuron’s membrane potential affecting the synchronization process of neurons, and the neurons’ discharge patterns and synchronization process can be adjusted and controlled by the discharge pattern and the strength of the stimulation neuron’s membrane potential. This result is helpful to study synchronization and encode of many neurons or neural network.
Preparation and Characterization of Micro-patterned BiFeO3 Films by Photolithography-self-assembly Method
WANG Yan, TAN Guo-Qiang, MIAO Hong-Yan
无机材料学报 , 2010, DOI: 10.3724/sp.j.1077.2010.10223
Abstract: Micro-patterned BiFeO3 thin films were prepared successfully on glass substrates by photolithography-self-assembly method. The characterizations of samples were carried out through XRD, SEM, AFM, XPS and EDS. The results of AFM and contact angle test show that the modification of octadecyltrichlorosilane (OTS) monomolecular layer is achieved by UV-irradiation through a photomask, generating hydrophilic silanol areas and hydrophobic self-assembled monolayer (SAM) regions. XRD and XPS indicate that the films absorbed to the glass substrates are pure rhombohedrally distorted structure BiFeO3. In addition, SEM and EDS are employed to confirm that no continuous BiFeO3 particles deposited on SAM regions could be easily peeled off by ultrasonication, while a uniform and clear patterned film with good adherence is site-selectively formed in the hydrophilic silanol regions.
Electronic Raman Scattering in Graphene

LU Hong-Yan,WANG Qiang-Hua,

中国物理快报 , 2008,
Abstract: Linear dispersion near the Dirac points in the band structure of graphenes can give rise to novel physical properties. We calculate the electronic contribution to the Raman spectra in graphenes, which also shows novel features. In the clean limit, the Raman spectrum in the undoped graphene is linear (with a universal slope against impurity scattering) at low energy due to the linear dispersion near the Dirac points, and it peaks at a position corresponding to the van Hove singularity in the band structure. In a doped graphene, the electronic Raman absorption is forbidden up to a vertical inter-band particle--hole gap. Beyond the gap the spectrum follows the undoped case. In the presence of impurities, absorption within the gap (in the otherwise clean case) is induced, which is identified as the intra-band contribution. The Drude-like intra-band contribution is seen to be comparable to the higher energy inter-band Raman peak. The results are discussed in connection to experiments.
Research on topic crawling algorithm based on link and content

WANG Hong-yan,

计算机应用研究 , 2011,
Abstract: This paper studied the method of vertical search engine to obtain the resources related with the tile effectively. Firstly, proposed the improved PageRank algorithm to measure the link similarity of the page. Secondly, put forward the similarity based on the content by using the url, title and text of each page. Finally, proposed BLCT topic crawling algorithm based on link and content by combining content similarity with link similarity. The experimental results show that proposed algorithm performs better in the average harvest rate and target recall rate, and the crawled pages relevant to the topic is more than the previous algorithm.
Extensive Evaluation Approach for Information Resource Integrity of E-Government Website
Li Hong-Yan,Wang Yu-Ming
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: For the lack of an analysis of information resource integrity of e-government, this study will use extensive evaluation approach to evaluate the standards and norms, services and information on the way, organization and functions, public services technologies and platforms of information resource integrity of egovernment. The implementation of information resource integrity can facilitate the work of the administrator and lay a solid foundation for the comprehensive use of resources, and it is a very useful exploration for the development of e-government website.
Branching Fractions and Asymmetries of and Decays in the Family Nonuniversal Model
Ying Li,En-Lei Wang,Hong-Yan Zhang
Advances in High Energy Physics , 2013, DOI: 10.1155/2013/175287
Abstract: Within the QCD factorization framework, we investigate the branching fractions and the direct asymmetries of decays and under two different scenarios in the standard model and the family nonuniversal model. We find that the annihilation terms play crucial roles in these decays and lead to the major uncertainties. For decays , the new boson could change the branching fractions remarkably. However, for other decays, its contribution might be clouded by large uncertainties from annihilations. Unfortunately, neither the standard model nor the model can reproduce all experimental data simultaneously under one certain scenario. We also noted that the direct asymmetries of could be used to identify the meson and search for the contribution of new boson. 1. Introduction The study of meson rare decays is a crucial tool in testing the fundamental interactions among elementary particles, exploring the origin of violation, and searching for possible new physics (NP) beyond the standard model (SM). Theoretically and experimentally, such kind of research has been conducted in great detail, especially in the weak interactions of meson. In particular, processes induced by flavor-changing neutral currents (FCNC) attract our attentions, because FCNC only occur at the loop level in SM, and they are always regarded as sensitive probes of NP. FCNC processes have been explored in the - mixing and the semileptonic weak decays, which permit a clean theoretical description. Charmless hadronic meson decays, such as , and , induced by FCNC have been studied extensively. In the past few years, the effects of NP in these decays have been studied widely. These include supersymmetry models, two-Higgs doublet models, models, fourth generation models, and extra dimension models (see review in [1] and references therein). In the past twenty years, several novel methods have also been proposed to deal with the nonleptonic charmless meson decays, such as the naive factorization [2, 3], the QCD factorization (QCDF) [4–7], the perturbative QCD (PQCD) [8, 9], and the soft collinear effective theory [10–12]. In order to search for effect of NP in the hadronic decays, the most theoretical studies are focused on , , or . However, the studies of the decay modes involving a scalar meson are relatively few, because the underlying structure of the scalar mesons has not been well established theoretically. To describe the component of the scalar mesons, there are usually two possible scenarios (S1 and S2) according to the QCD sum rule method [13]: (i) in S1, we treat scalars above 1?GeV as the first
Determination of the intrinsic velocity field in the M87 jet
Chun-Cheng Wang,Hong-Yan Zhou
Physics , 2009, DOI: 10.1111/j.1365-2966.2009.14463.x
Abstract: A new method to estimate the Doppler beaming factor of relativistic large-scale jet regions is presented. It is based on multiwaveband fitting to radio-to-X-ray continua with synchrotron spectrum models. Combining our method with available observational data of proper motions, we derive the intrinsic velocity as well as the viewing angles to the line of sight for eight knotty regions down the M87 jet. The results favor the 'modest beaming' scenario along the jet, with Doppler factors varying between 2-5. The inner jet of M87 suffers sharp deceleration, and the intrinsic speed remains roughly constant down the outer jet. The orientation of the inner jet regions is fully consistent with the result of 10deg-19deg to the line of sight suggested by previous Hubble Space Telescope (HST) proper motion studies of the M87 jet. The outer jet, however, shows systematic deflection off the inner jet to much smaller inclination (<<10deg). Further calculation of knot A suggests this deflection can be regarded as evidence that the outer jet suffers some departure from equipartition. The nucleus region of the M87 jet should have a viewing angle close to its first knot HST-1, i.e. ~15deg, which favors the idea that M87 may be a misaligned blazar. This work provides some hints about the overall dynamics of this famous extragalactic jet.
Disentangling single-particle gap by electronic Raman absorption in electron-doped cuprates
Hong-Yan Lu,Qiang-Hua Wang
Physics , 2006,
Abstract: In the under- to optimal-doping regimes of electron-doped cuprates, it was theoretically suspected that there is a coexistence of superconducting (SC) and antiferromagnetic (AFM) orders. The quasi-particle excitations could be gapped by both orders, and the effective gap is non-monotonic d-wave-like in the momentum space. Alternatively the gap was also speculated as a pure pairing gap. Using an effective microscopic model, we consider the manifestation of the quasi-particle gap in the electronic Raman spectra in a range of doping levels, where the relative strength of the SC and AFM order parameters varies. We demonstrate that from the electronic Raman spectra the effective single-particle gap can be disentangled into contributions from the two distinctive orders. This would help to tell whether the non-monotonic gap is due to the coexistence of SC and AFM orders.
Effect of fertilizer application mode on edaphon in black soil in Songnen Plain

YU Hong-Yan,WANG Hong-Yan,HAN Xiao-Ying,BAI Tao,
,王宏燕,韩晓盈,白 涛

中国生态农业学报 , 2007,
Abstract: Field experiment was conducted to research the effect of manure and chemical fertilizer on the number of nitrogen transferrer edaphon(e.g.aerobic nitrogen-fixing bacteria,ammonifiers,nitrite bacteria and denitrifying bacteria)in black soil ecosystems.Results show that application of manure increase the number of aerobic nitrogen-fixing bacteria,ammonifiers and denitrifying bacteria,while chemical fertilizers reduce the number of aerobic nitrogen-fixing bacteria in black soils,increase the number of denitrifying bacteria.Otherwise combination of equally proportioned manure and chemical fertilizer promotes aerobic nitrogenfixing bacteria,nitrite bacteria and denitrifying bacteria activities.
DMC-based Dual Closed-loops Control under Internet Environment

LI Hong-yan,WANG Hong,GUI Chao,

计算机应用研究 , 2006,
Abstract: Closed-loop real-time control over Internet is very difficult because of the uncertain Internet time-delay influencing the dynamic performance of control systems during Internet transmission.A dual closed-loops control strategy based on DMC is proposed to deal with these problems.Combining with dual-rate sampling ideal,the local closed-loop controller is running at a higher frequency to stabilize the plant and the remote controller at a lower frequency implements the global control function.Two time-delay compensators based on Dynamic Matrix Controller(DMC)are designed to compensate Internet time delay in the feed-forward and feedback channels.The simulation results show the efficiency of the new control method for overcoming the Internet time-delay.
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