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Search Results: 1 - 10 of 23004 matches for " Xiaoqing Yuan "
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Innovations in Trade Financing Process of Commercial Bank
Yijun Yuan,Xiaowei Dong,Xiaoqing Lv
International Business Research , 2009, DOI: 10.5539/ibr.v1n4p27
Abstract: From the point of view of bank process reengineering theory, the paper focuses its discussion on definition and features of international trade financing based on the principles and requirements of financial innovation. Through the clarification for international trade financing process and comparison for ways of international trade financing under traditional trade settlement methods, trade financing process innovation has been fulfilled.
Reliability Analysis of Metro Door System Based on FMECA  [PDF]
Xiaoqing Cheng, Zongyi Xing, Yong Qin, Yuan Zhang, Shaohuang Pang, Jun Xia
Journal of Intelligent Learning Systems and Applications (JILSA) , 2013, DOI: 10.4236/jilsa.2013.54024
Abstract: The metro door system is one of the high failure rate subsystems of metro trains. The Failure Mode, Effects and Criticality Analysis (FMECA) method is applied to analyze the reliability of metro door system in this paper. Firstly, failure components of the door are statistically analyzed, and the major failure components are determined. Secondly, failures are classified according to their impacts on operation, and methods of calculating failure mode criticality and the related coefficients are illustrated. Finally, the FMECA is detailed in the selected 12 failure modes, and the failure modes are discovered that they have the most significant effect on metro door system. The obtained results can be used for optimal design and maintenance of the metro door system.
Study on the Real-Time Security Evaluation for the Train Service Status Using Safety Region Estimation  [PDF]
Guiling Liao, Yong Qin, Xiaoqing Cheng, Lisha Pan, Lin He, Shan Yu, Yuan Zhang
Journal of Intelligent Learning Systems and Applications (JILSA) , 2013, DOI: 10.4236/jilsa.2013.54025
Abstract: For the important issues of security service of rail vehicles, the online quantitative security assessment method of the service status of rail vehicles and the key equipments is urgently needed, so the method based on safety region was proposed in the paper. At first, the formal description and definition of the safety region were given for railway engineering practice. And for the research objects which their models were known, the safety region estimation method of system stability analysis based on Lyapunov exponent was proposed; and for the research objects which their models were unknown, the data-driven safety region estimation method was presented. The safety region boundary equations of different objects can be obtained by these two different approaches. At last, by real-time analysis of the location relationship and generalized distance between the equipment service status point and safety region boundary, the online safety assessment model of key equipments can be established. This method can provide a theoretical basis for online safety evaluation of trains operation; furthermore, it can provide support for real-time monitoring, early warning and systematic maintenance of rail vehicles based on the idea of active security.a
Biodiversity of the Symbiotic Bacteria Associated with Toxic Marine Dinoflagellate Alexandrium tamarense  [PDF]
Xiaoling Zhang, Xiaoqing Tian, Liyan Ma, Bing Feng, Qiaohong Liu, Lidong Yuan, Chengqi Fan, Hongliang Huang, Hongliang Huang, Qiao Yang
Journal of Biosciences and Medicines (JBM) , 2015, DOI: 10.4236/jbm.2015.36004
Abstract:

Paralytic shellfish poisoning (PSP) toxins are potent neurotoxins mainly produced by dinoflagellates and being concentrated in bivalves through food web transfer. Increasing number of findings of toxin-producing bacteria in the cells of dinoflagellate such as Alexandriumtamarense supports the hypothesis of the bacterial origin of PSP toxins. Evidence that there are specific symbiosis bacterial taxa associated with the phytoplankton indicates the presence of specific selective mechanisms between them, and implies that the symbiosis bacteria have some vital function to the benefit of the dinoflagellates. Studies on the role of toxin-producing symbiosis bacteria in the marine ecosystem are considered to be becoming more important. Although toxigenic bacteria could be isolated from toxic dinoflagellates, it was not clearly proven whether the isolated bacterial strains based on culture-dependent manner and the corresponding intracellular bacteria were the same because of microbial unculturability. This paper aims to demonstrate the biodiversity of the symbiotic bacteria associated with toxic dinoflagellate A. tamarense using the culture-indepen- dent high-throughput pyrosequencing method, as well as the phylogenetic analysis based on 16S rDNA sequences of the symbiotic cultivable bacteria strains isolated from toxic Alexander tamarense.

Medical image fusion based on pulse coupled neural networks and multi-feature fuzzy clustering  [PDF]
Xiaoqing Luo, Xiaojun Wu
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.512A111
Abstract:

Medical image fusion plays an important role in clinical applications such as image-guided surgery, image-guided radiotherapy, noninvasive diagnosis, and treatment planning. In order to retain useful information and get more reliable results, a novel medical image fusion algorithm based on pulse coupled neural networks (PCNN) and multi-feature fuzzy clustering is proposed, which makes use of the multi-feature of image and combines the advantages of the local entropy and variance of local entropy based PCNN. The results of experiments indicate that the proposed image fusion method can better preserve the image details and robustness and significantly improve the image visual effect than the other fusion methods with less information distortion.

Enhanced Nonlinear Absorption Performance of Reduced Graphene Oxide Nanohybrid Covalently Functionalized by Porphyrin via 1,3-Dipolar Cycloaddition  [PDF]
Nan Zhang, Xiaoqing Cong
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.912070
Abstract: Porphyrin-functionalized reduced graphene oxide (RGO-TPP) was prepared by 1,3-dipolar cycloaddition reaction and characterized by Fourier transform infrared spectroscopy, Raman, ultraviolet/visible absorption, fluorescence, and transmission electron microscopy. At the same level of linear transmittance, RGO-TPP exhibited more enhanced optical nonlinearities than RGO and the pristineporphyrin, implying a remarkable accumulation effect as a result of the covalent link between RGO and porphyrin. The role of energy/electron transfer in the optical nonlinearities of RGO-TPP was investigated by fluorescence and Raman spectroscopy. All the results displayed that RGO can be covalently functionalized with porphyrins by the proposed approach.
The mechanism for fuzzy-ball working fluids for controlling & killing lost circulation
LiHui Zheng,LingChen Kong,Yuan Cao,HuiYun Wang,ZiXuan Han,XiaoQing He
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3202-8
Abstract: Lost circulation controlling & killing material has been a focused issue since a long time ago. A novel leak resistance fluid with the raw materials such as SDS, SDBS, HES, PAM and proprietary productions has been developed from laboratory. The experiment and application shows that the new leak resistance fluid can plug leaking passage of different sizes simultaneously. Observing with 1000 to 2000 time microscope, it is found that the working liquid contains a kind of spherical material which has the microstructure of “one core, two layers, and three membranes”. When it is in a static state, the inside of the material looks like an airbag and the outside looks like some fuzzy things which has high gel strength. While when it is in a dynamic state, the fuzzy thing is cut or scattered and flow ability becomes much better. That is the reason why it is called fuzzy-ball. When the diameter or the width of the leak passage is greater than the fuzzy-ball’s, the fuzzy-ball accumulates in conical shape to decompose the working fluid pressure of liquid column to achieve blocking; when the diameter or the width of the leak passage is equivalent to the fuzzy-ball’s, the fuzzy-ball changes from sphere to oval-shape to increase the resistance to the leak passage and plug the holes; when the diameter or the width of the leak passage is smaller than the fuzzy-ball’s, the leaks could be blocked up by the non-permeable membrane formed by the gel of high strength in the working fluid. In these cases, the leak passages of different sizes could be blocked comprehensively.
Multiple Periodic Solutions of a Nonautonomous Plant-Hare Model
Yongfei Gao,P. J. Y. Wong,Y. H. Xia,Xiaoqing Yuan
Abstract and Applied Analysis , 2014, DOI: 10.1155/2014/130856
Abstract: Based on Mawhin's coincidence degree theory, sufficient conditions are obtained for the existence of at least two positive periodic solutions for a plant-hare model with toxin-determined functional response (nonmonotone). Some new technique is used in this paper, because standard arguments in the literature are not applicable. 1. Introduction In the past few decades, the classical predator-prey model has been well studied. Such classical predator-prey model has, however, been questioned by several biologists (e.g., see [1, 2]). Based on experimental data, Holling [3] has proposed several types of monotone functional responses for these and other models. However, this will not be appropriate if we explore the impact of plant toxicity on the dynamics of plant-hare interactions [4]. Recently, Gao and Xia [5] considered a nonautonomous plant-hare dynamical system with a toxin-determined functional response given by where Here, denotes the density of plant at time , denotes the herbivore biomass at time , is the plant intrinsic growth rate at time , is the per capita rate of herbivore death unrelated to plant toxicity at time , is the conversion rate at time , is the encounter rate per unit plant, is the fraction of food items encountered that the herbivore ingests, is the carrying capacity of plant, measures the toxicity level, and is the time for handing one unit of plant. The functions , , and are continuous, positive, and periodic with period , and , , , , and are positive real constants. For any continuous -periodic function , we let The topological degree of a mapping has long been known to be a useful tool for establishing the existence of fixed points of nonlinear mappings. In particular, a powerful tool to study the existence of periodic solution of nonlinear differential equations is the coincidence degree theory (see [6]). Many papers study the existence of periodic solutions of biological systems by employing the topological degree theory; see, for example, [7–12] and references cited therein. However, most of them investigated the classical predator-prey model or the models with Holling functional responses; see [7–10]. There is no paper studying the functional responses in model (1) except for [5]. Gao and Xia [5] have obtained some sufficient conditions for the existence of at least one positive periodic solution for the system (1). Unlike the traditional Holling Type II functional response, systems with nonmonotone functional responses are capable of supporting multiple interior equilibria and bistable attractors. Thus, for nonautonomous
Effects of Dentifrice Containing Hydroxyapatite on Dentinal Tubule Occlusion and Aqueous Hexavalent Chromium Cations Sorption: A Preliminary Study
Peiyan Yuan, Xiaoqing Shen, Jing Liu, Yarong Hou, Manqun Zhu, Jiansheng Huang, Pingping Xu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0045283
Abstract: In order to endow environmental protection features to dentifrice, hydroxyapatite (HA) was added to ordinary dentifrice. The effects on dentinal tubule occlusion and surface mineralization were compared after brushing dentine discs with dentifrice with or without HA. The two types of dentifrice were then added to 100 μg/ml of hexavalent chromium cation (Cr6+) solution in order to evaluate their capacities of adsorbing Cr6+ from water. Our results showed that the dentifrice containing HA was significantly better than the ordinary dentifrice in occluding the dentinal tubules with a plugging rate greater than 90%. Moreover, the effect of the HA dentifrice was persistent and energy-dispersive spectrometer (EDS) revealed that the atomic percentages of calcium and phosphorus on the surface of dentine discs increased significantly. Adding HA to ordinary dentifrice significantly enhanced the ability of dentifrice to adsorb Cr6+ from water with the removal rate up to 52.36%. In addition, the sorption was stable. Our study suggests that HA can be added to ordinary dentifrice to obtain dentifrice that has both relieving dentin hypersensitivity benefits and also helps to control environmental pollution.
An Efficient Algorithm for Transient Calculation of the Electric Networks Including Magnetizing Branches
Xiaoqing Zhang
Mathematical Problems in Engineering , 2011, DOI: 10.1155/2011/479626
Abstract: A simplified model of magnetic saturation characteristics is proposed in this paper for transient calculation of the electric networks including magnetizing branches. The model represents the magnetic saturation characteristics by the continuous function instead of the piecewise linear approximation. Based on the proposed model, an efficient transient algorithm is developed. The nonlinear differential equations describing the transient behavior of the magnetizing branches are solved by the semiexplicit Runge-Kutta method, in which noniterative computations are involved. The transient calculation for the remaining linear network is performed in terms of the solution to the magnetizing branches. A comparison is made between calculated and experimental results to confirm the validity of the algorithm.
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