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Search Results: 1 - 10 of 14804 matches for " Baoping Tang "
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Bearing Degradation Process Prediction Based on the Support Vector Machine and Markov Model
Shaojiang Dong,Shirong Yin,Baoping Tang,Lili Chen,Tianhong Luo
Shock and Vibration , 2014, DOI: 10.1155/2014/717465
Abstract: Predicting the degradation process of bearings before they reach the failure threshold is extremely important in industry. This paper proposed a novel method based on the support vector machine (SVM) and the Markov model to achieve this goal. Firstly, the features are extracted by time and time-frequency domain methods. However, the extracted original features are still with high dimensional and include superfluous information, and the nonlinear multifeatures fusion technique LTSA is used to merge the features and reduces the dimension. Then, based on the extracted features, the SVM model is used to predict the bearings degradation process, and the CAO method is used to determine the embedding dimension of the SVM model. After the bearing degradation process is predicted by SVM model, the Markov model is used to improve the prediction accuracy. The proposed method was validated by two bearing run-to-failure experiments, and the results proved the effectiveness of the methodology. 1. Introduction Bearing is one of the most important components in rotating machinery. Accurate bearing degradation process prediction is the key to effective implement of condition based maintenance and can prevent unexpected failures and minimize overall maintenance costs [1, 2]. To achieve effective degradation process prediction of the bearing, firstly, the features should be extracted from the collected vibration data. Then, based on the extracted features effectively prediction models should be selected [3]. Feature extraction is the process of transforming the raw vibration data collected from running equipment to relevant information of health condition. There are three types of methods to deal with the raw vibration data: time domain analysis, frequency domain analysis, and time-frequency domain analysis. The three types of methods are often chosen to extract the feature. For example, Yu [4] chose the time domain and the frequency domain transform to describe the characteristics of the vibration signals. Yan et al. [5] chose the short-time Fourier transform to extract the features. Ocak et al. [6] chose the wavelet packet transform to extract the feature of bearing wear information. Because the frequency features from FFT analysis results often tend to average out transient vibrations and thus not providing a wholesome measure of the bearing health status, in this paper, the time domain and the time-frequency domain characteristics are used to extract the original features. Although the original features can be extracted, they are still with high dimension and include
Characterization and comparison of Serratia marcescens isolated from edible cactus and from silkworm for virulence potential and chitosan susceptibility
Li, Bin;Yu, Rongrong;Liu, Baoping;Tang, Qiaomei;Zhang, Guoqing;Wang, Yanli;Xie, Guanlin;Sun, Guochang;
Brazilian Journal of Microbiology , 2011, DOI: 10.1590/S1517-83822011000100013
Abstract: representative strains of serratia marcescens from an edible cactus plant and silkworms were characterized and a comparison based on their cellular fatty acid composition, 16s rrna and groe gene sequence analysis as well as silkworm virulence and chitosan susceptibility was carried out. results from this study indicate that there are no significant differences between the phenotypic and molecular characterization, virulence and chitosan susceptibility of the s. marcescens strains from the cactus plant and silkworms. silkworms inoculated with s. marcescens from either plant or silkworm resulted in nearly 100% mortality. chitosan solution exhibited strong antibacterial activity against s. marcescens. this activity increased with the increase of chitosan concentration and incubation time regardless of the strain source. also, the results indicate that the plant associated s. marcescens maybe plays a possible role in the contamination of humans and animals, in particular silkworms, while chitosan showed a potential to control the contamination caused by s. marcescens.
A-priori bounds for KdV equation below $H^{-3/4}$
Baoping Liu
Mathematics , 2011,
Abstract: We consider the Korteweg-de Vries Equation (KdV) on the real line, and prove that the smooth solutions satisfy a-priori local in time $H^s$ bound in terms of the $H^s$ size of the initial data for $s\geq -4/5$.
Expression and Function of Kisspeptin during Mouse Decidualization
Peng Zhang, Min Tang, Ting Zhong, Yan Lin, Teng Zong, Chengxue Zhong, BaoPing Zhang, Min Ren, HaiBin Kuang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0097647
Abstract: Background Plasma kisspeptin levels dramatically increased during the first trimester of human pregnancy, which is similar to pregnancy specific glycoprotein-human chorionic gonadotropin. However, its particular role in the implantation and decidualization has not been fully unraveled. Here, the study was conducted to investigate the expression and function of kisspeptin in mouse uterus during early pregnancy and decidualization. Methodology/Principal Findings Quantitative PCR results demonstrated that Kiss1 and GPR54 mRNA levels showed dynamic increase in the mouse uterus during early pregnancy and artificially induced decidualization in vivo. KISS-1 and GPR54 proteins were spatiotemporally expressed in decidualizing stromal cells in intact pregnant females, as well as in pseudopregnant mice undergoing artificially induced decidualization. In the ovariectomized mouse uterus, the expression of Kiss1 mRNA was upregulated after progesterone or/and estradiol treatment. Moreover, in a stromal cell culture model, the expression of Kiss1 and GPR54 mRNA gradually rise with the progression of stromal cell decidualization, whereas the attenuated expression of Kiss1 using small interfering RNA approaches significantly blocked the progression of stromal cell decidualization. Conclusion our results demonstrated that Kiss1/GPR54 system was involved in promoting uterine decidualization during early pregnancy in mice.
Delay-dependent Robust H∞ Control for T-S Fuzzy Descriptor Networked Control System with Multiple State Delays
Baoping Ma,Qingmin Meng
Journal of Computers , 2011, DOI: 10.4304/jcp.6.3.571-577
Abstract: The problem of delay-dependent robust H∞ control for T-S fuzzy descriptor networked control systems with multiple state time-delays is investigated. First, in terms of linear matrix inequality (LMI) approach, an improved delay-dependent
Response of 3D Free Axisymmetric Rigid Objects under Seismic Excitations
Li Yanheng,Shi Baoping
Physics , 2008,
Abstract: Previous studies of precariously balanced objects in seismically active regions provide important information for aseismatic engineering and theoretical seismology. They are almost founded on an oversimplified assumption: any 3-dimensional (3D) actual object with special symmetry could be regarded as a 2D finite object in light of the corresponding symmetry. To gain an actual evolution of precariously balanced objects subjected to various levels of ground accelerations, a 3D investigation should be performed. In virtue of some reasonable works from a number of mechanicians, we derive three resultant second-order ordinary differential equations determine the evolution of 3D responses. The new dynamic analysis is following the 3D rotation of a rigid body around a fixed point. A computer program for numerical solution of these equations is also developed to simulate the rocking and rolling response of axisymmetric objects to various levels of ground accelerations. It is shown that the 2D and 3D estimates on the minimum overturning acceleration of a cylinder under the same sets of half- and full-sine-wave pulses are almost consistent except at several frequency bonds. However, we find that the 2D and 3D responses using the actual seismic excitation have distinct differences, especially to north-south (NS) and up-down (UD) components. In this work the chosen seismic wave is the El Centro recording of the 18 May 1940 Imperial Valley Earthquake. The 3D outcome does not seem to support the 2D previous result that the vertical component of the ground acceleration is less important than the horizontal ones. We conclude that the 2D dynamic modeling is not always reliable.
Dynamic Rupture, Fault Opening, and Near Fault Particle Motions along an Interface between Dissimilar Materials
Baoping Shi,Yanheng Li
Physics , 2008,
Abstract: Dynamic rupture propagation along an interface between two different elastic solids under shear dominated loading is studied numerically by a 2-D lattice particle model (LPM). The configuration of the lattice particle model consists of two solid blocks of different elastic properties connected along a planar interface. Each block is characterized as an isotropic elastic material and the interface strength is described as a composite elastic modulus of a mismatch function of the elastic properties of two dissimilar materials. The particle interaction between the two blocks with pair inter-particle potential also takes account of normal stress variations.
Global wellposedness of the equivariant Chern-Simons-Schr?dinger equation
Baoping Liu,Paul Smith
Mathematics , 2013,
Abstract: In this article we consider the initial value problem for the m-equivariant Chern-Simons-Schr\"odinger model in two spatial dimensions with real-valued coupling parameter g. This is a covariant NLS type problem that is L^2-critical. We prove that at the critical regularity, for any integer-valued equivariance index m, the initial value problem in the defocusing case (g < 1) is globally wellposed and the solution scatters. The problem is focusing when g >= 1, and in this case we prove that for nonnegative integer-valued equivariance indices m there exist constants c = c_{m, g} such that, at the critical regularity, the initial value problem is globally wellposed and the solution scatters when the L^2 initial data phi_0 is m-equivariant and has L^2-norm less than the square root of c_{m, g}. We also show that c_{m, g}^{1/2} is equal to the minimum L^2 norm of a nontrivial m-equivariant standing wave solution. In the self-dual g = 1 case, we have the exact numerical values c_{m, 1} = 8*pi*(m + 1).
Antioxidant Activities and Inhibitory Effects of Auricularia Auricular and Its Functional Formula Diet Against Vascular Smooth Muscle Cell in Vitro  [PDF]
Yangchao Luo, Zhenlei Xiao, Qin Wang, Bo Li, Baoping Li
Food and Nutrition Sciences (FNS) , 2011, DOI: 10.4236/fns.2011.24038
Abstract: The functional formula diet AHP, containing polysaccharides from Auricularia auricular, polyphenolic compounds from Hawthorn (Crataegus) and Pueraria radix, has been recently developed as a dietary intervention against dyslipidemia in our previous study. In the present study, its antioxidant activities and protective effects against proliferation of vascular smooth muscle cells (VSMCs) were investigated. AHP possessed the potent radical-scavenging effects against hydroxyl and superoxide radicals, and also the inhibitory effects against peroxidation of low density lipoprotein induced by Cu2+ in vitro. The protective effects of AHP against proliferation of VSMCs were evaluated through the methodology of serum pharmacology. The serum containing AHP significantly inhibited the proliferation of VSMCs induced by oxidized low density lipoprotein in a time- and dose-dependent manner, and also promoted the nitric oxide production of VSMCs. Our study indicated that this functional formula diet would be a potent alternative as a functional diet to prevent atherosclerosis at early stage.
Status of Mycoplasma pneumoniae Pneumonia in Chinese Children: A Systematic Review  [PDF]
Qiang Qin, Baoping Xu, Xiuyun Liu, Kunling Shen
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.411076
Abstract: Mycoplasma pneumoniae pneumonia (MPP) becomes one of the most important health problems in China recently. Date for MPP inChinais scarce. Although macrolides and/or cortical steroids had been reported to be effective treatment for MPP, the long-term outcome remained uncertain. A study on status of MPP in China was conducted via a systematic review of published studies which have the Chinese data and collected from published PubMed and core journals of China Knowledge Resource Integrated Database (CNKI). The analysis was based on epidemiology, clinical characteristics, treatment, drug resistance and prognosis. Twenty five articles concerned about MPP in Chinese children and adolescent were enrolled, including 11 studies on epidemiology/etiology, 11 studies on clinical characteristics, 7 studies on drug resistance, 5 studies on treatment from mainland China respectively. The overall incidence of MPP ranged from 7.1% to 54.4%. Fever and cough were most frequently identified in manifestations. Drug resistance to macrolides ranged from 18.9% to 90%. The outcome of treatment in patients who received combined treatment of macrolides, cephalosporin antibiotics and/or cortical steroid seems to be better than those who received macrolides only. Macrolide combined with cephalosporin or cortical steroid both may decrease the severity of MPP in the past decade. There was not enough evidence to suggest that cortical steroid can decrease the mortality of MPP in children. And a multi-center, randomized double blind research on the effect of cortical steroid was encouraged.
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