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Search Results: 1 - 10 of 37955 matches for " Liping Zhao "
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Effect of Ethanol Extract of Venenum Bufonis on Biofilm Formation of Staphylococcus aureus  [PDF]
Bing Yan, Man Guo, Liping Zhao
Chinese Medicine (CM) , 2014, DOI: 10.4236/cm.2014.54026
Abstract: Ethanol extract of Venenum Bufonis has shown many valuable bioactivities, but little is known about its effect on biofilm formation of Staphylococcus aureus. In this study, biofilm formation of S. aureus NCTC8325 with or without ethanol extract of Venenum Bufonis was tested using microtitre plate assay and Confocal Laser Scanning Microscope (CLSM) system. Results show that the biofilm formation of S. aureus with ethanol extract of Venenum Bufonis was significantly lower than that of the control group without ethanol extract of Venenum Bufonis. Meanwhile, the reduction degree was correlated to the concentration of ethanol extract of Venenum Bufonis positively. With CLSM system we can observe that looser and less biomass of the biofilm structure of the experimental group appeared than that of the control group. These results suggested that ethanol extract of Venenum Bufonis has inhibitory effect on biofilm formation of S. aureus.
Building a Secure Mobile Payment Protocol in the Cloud  [PDF]
Liping Du, Guifen Zhao, Ying Li
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.47009
Abstract:

This paper is mainly to resolve the secure problems of mobile payment business which the remote payment is their main businesses. The identity authenticity of mobile payment user, the confidentiality and non repudiation of information transmitted in the mobile payment process are all the main secure problems. The secure mobile payment protocol is established base all the above secure problems’ solutions.

Infinitely many solutions to a fractional nonlinear Schr?dinger equation
Liping Wang,Chunyi Zhao
Mathematics , 2014,
Abstract: This paper considers the fractional Schr\"{o}dinger equation \begin{equation}\label{abstract} (-\Delta)^s u + V(|x|)u-u^p=0, \quad u>0, \quad u\in H^{2s}(\R^N) \end{equation} where $0
Infinitely many solutions for the prescribed boundary mean curvature problem on $\mathbb B^N$
Liping Wang,Chunyi Zhao
Mathematics , 2012,
Abstract: We consider the following prescribed boundary mean curvature problem in $\mathbb B^N$ with the Euclidean metric $-\Delta u =0$, $u>0$ in $B^N, \frac{\partial u}{\partial\nu} + \frac{N-2}{2} u =\frac{N-2}{2} K(x) u^{N/(N-2)}$ on $S^{N-1}, where $K$ is positive and rotationally symmetric on $\mathbb S^{N-1}$. We show that if ${K}$ has a local maximum point, then the equation has {\bf infinitely many positive} solutions, which are non-radial on $\mathbb S^{N-1}$.
A nonlinear explicit dynamic GBT formulationfor modeling impact response of thin-walled steel members
Duan Liping, Zhao Jincheng
- , 2018, DOI: 10.3969/j.issn.1003-7985.2018.02.014
Abstract: A nonlinear explicit dynamic finite element formulation based on the generalized beam theory(GBT)is proposed and developed to simulate the dynamic responses of prismatic thin-walled steel members under transverse impulsive loads. Considering the rate strengthening and thermal softening effects on member impact behavior, a modified Cowper-Symonds model for constructional steels is utilized. The element displacement field is built upon the superposition of GBT cross-section deformation modes, so arbitrary deformations such as cross-section distortions, local buckling and warping shear can all be involved by the proposed model. The amplitude function of each cross-section deformation mode is approximated by the cubic non-uniform B-spline basis functions. The Kirchhoff’s thin-plate assumption is utilized in the construction of the bending related displacements. The Green-Lagrange strain tensor and the second Piola-Kirchhoff(PK2)stress tensor are employed to measure deformations and stresses at any material point, where stresses are assumed to be in plane-stress state. In order to verify the effectiveness of the proposed GBT model, three numerical cases involving impulsive loading of the thin-walled parts are given. The GBT results are compared with those of the Ls-Dyna shell finite element. It is shown that the proposed model and the shell finite element analysis has equivalent accuracy in displacement and stress. Moreover, the proposed model is much more computationally efficient and structurally clearer than the shell finite elements.
Optimal Reservoir Operation Using Stochastic Dynamic Programming  [PDF]
Pan Liu, Jingfei Zhao, Liping Li, Yan Shen
Journal of Water Resource and Protection (JWARP) , 2012, DOI: 10.4236/jwarp.2012.46038
Abstract: This paper focused on the applying stochastic dynamic programming (SDP) to reservoir operation. Based on the two stages decision procedure, we built an operation model for reservoir operation to derive operating rules. With a case study of the China’s Three Gorges Reservoir, long-term operating rules are obtained. Based on the derived operating rules, the reservoir is simulated with the inflow from 1882 to 2005, which the mean hydropower generation is 85.71 billion kWh. It is shown that the SDP works well in the reservoir operation.
Implementation of LT Code with a Novel Degree Distribution  [PDF]
Qingxiao Du, Xiaoqin Song, Ying Liu, Liping Zhao
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24B046
Abstract: It is known that Luby Transform code (LT code) is the first code fully realizing the digital fountain concept and provides an efficient scheme to transfer information over different channels. The key to make LT code work well is the degree distribution used in the encoding procedure. It determines the degree of each encoding symbol. On the basis of robust solition distribution and optimized degree distribution, a novel degree distribution which has only one parameter is proposed in this paper. Through computer simulation, the performance of LT code with the novel degree distribution is better than the robust solition distribution and sparse degree distribution. The conclusion of the research is practically valuable in improving the efficience of data distribution application.
Application of VPN in Library Resource-Sharing
虚拟专用网VPN在图书馆资源共享中的应用

Zhao Liping,
赵丽萍

现代图书情报技术 , 2005,
Abstract: This article explains how to contruct the virtual private network of Wenzhou shared resource on the basis of MPLS VPN technology, and logically to link the public library, community library and the shared project of skeleton center network into a uniform Intranet to realize information resource share of wenzhou public library and improve the ability of information service in county library.
Scaling Up of E-Msr Codes Based Distributed Storage Systems with Fixed Number of Redundancy Nodes
Haotian Zhao,Yinlong Xu,Liping Xiang
International Journal of Distributed and Parallel Systems , 2012,
Abstract: Distributed storage systems are becoming more and more popular with the rapidly increasing demand for large-scale data storage. To increase the capacity and I/O performance of a distributed storage system, scaling it up is a common method. Regenerating Codes are a class of distributed storage codes that offer good reliability through encoding and provide good bandwidth cost on failed nodes repairing. This paper studies the scaling problem of E-MSR codes based distributed storage systems with fixed number of redundancy codes. We generate the encoding matrices of an storage system carefully from the encoding matrices of an storage system to minimize the changes of encoded blocks when scaling. Therefore the system can be scaled up with relatively low bandwidth cost and computation cost.
CVD Treatment of Carbon Fibers and Evaluation of Their Dispersion in CFRC  [PDF]
Chuang Wang, Bingliang Li, Lei Peng, Wenmin He, Liping Zhao, Kezhi Li
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.88046
Abstract: Carbon-fiber-reinforced cement-based (CFRC) composites is a promising functional material which can be used both in the military and civil fields against electromagnetic interference. However, it is essential to make carbon fibers dispersed uniformly during the preparation of CFRC. In this work, short carbon fibers were treated through Chemical Vapor Deposition (CVD) process at high temperature between 900°C and 1200°C under the protection of diluted nitrogen gas N2 to modify the surface of carbon fibers to further strengthen the bonding between carbon fibers and cement matrix. Natural gas (98% CH4) was used as a precursor. It was decomposed to produce an uneven layer of pyrocarbon that was deposited on the surface of carbon fibers. CVD-treated carbon fibers were pre-dispersed by using ultrasonic wave. Both hydroxyethyl cellulose (HEC) and silicon fume were used as dispersants and as admixtures. They helped CVD-treated carbon fibers distribute uniformly. The mass fraction of HEC was around 1.78% in the aqueous solution. Four methods, namely, the simulation experiment (SE) method, the scanning electron microscopy (SEM) method, the fresh mixture (FM) method, and the electrical resistivity measurement (ERM) method were, respectively, applied to evaluate fiber dispersion degree. Each method indicated its own advantages and disadvantages and it therefore catered for different conditions. Of the four evaluation methods, the SE method was the most convenient way to determine the pre-dispersion state prior to the preparation of CFRC composites. This method was helpful for predicting the subsequent dispersion state of carbon fibers in the cement matrix because it economized a large quantity of raw materials and time.
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