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Search Results: 1 - 10 of 1000 matches for " Xiaohu Zeng "
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Investigation on the Interface Characteristics of the Thermal Barrier Coating System through Flat Cylindrical Indenters
Shifeng Wen,Xiaohu Zeng,Gongnan Xie
Advances in Mechanical Engineering , 2014, DOI: 10.1155/2014/654096
Abstract: Thermal barrier coating (TBC) systems are highly advanced material systems and usually applied to insulate components from large and prolonged heat loads by utilizing thermally insulating materials. In this study, the characteristics of the interface of thermal barrier coating systems have been simulated by the finite-element method (FEM). The emphasis was put on the stress distribution at the interface which is beneath the indenter. The effect of the interface roughness, the thermally grown oxide (TGO) layer’s thickness, and the modulus ratio ( ) of the thin film with the substrate has been considered. Finite-element results showed that the influences of the interface roughness and the TGO layer’s thickness on stress distribution were important. At the same time, the residual stress distribution has been investigated in detail. 1. Introduction Thermal barrier coating (TBC) systems are widely used in modern gas turbines and jet engines. They protect materials and allow hot gas temperatures to increase the efficiency of the engine [1–4]. Their local failure in hot spots with severe impacts on the structural integrity of the engine has been prevented during operation. Therefore, the failure of TBC systems should be sufficiently understood. Experimental observations showed that the failure of TBC system is very complex and mostly affected by a superposition of different mechanisms. For instance, the initiation of cracks very close to the interface between the TBC and the bond coat (BC) seemed to be explained well by the residual stress calculations made by Chang et al. [5] and others [6–9], but their propagation was not similar with the result observed through experiment. Meanwhile, numerous models based upon different conceptions have been proposed, which might qualitatively explain how cracks propagated [6, 10–12]. All models considered oxidation at the rough interface between TBC and BC and the phenomena resulting from the redistribution of residual stresses induced by volume increasing or morphological instability of the thermally grown oxide (TGO) layer [12–17] as the driving force of crack propagation. However, all models lacked quantitative verification. It is very interesting to apply the indentation technology to thin film/substrate (especially TBC) systems. Now many models to determine the adhesion strength have been presented [18–20]. It is important to analyze the stress characteristics of thin film/substrate systems. For example, the stress distribution of the layers has been studied by Njiwa and von Stebut [21] and Diao [22] with the boundary
Modelling of the relationship between trace elements and three species of sulfur in coal
Lu Xiaohu,Zeng Hancai,Wei Lu-xian
环境科学学报(英文版) , 1998,
Abstract: Based on the determination of several trace elements in coal particulate of different specific gravity, three-variables regression equations relate the contents of trace elements Be, Cd, Co, Pb, Cu, Ni, As and three species of sulfur in coal were well established. For elements Cd, Co, Pb, Cu and Ni, the regression equations were successfully used for prediction of these trace elements in individual part of coal with different specific gravity. Factor analysis was also used to analyze the data sets. The results showed that a three factor model can interpret the data sets reasonably. Trace elements Cd, Co, Pb, Cu, Ni, inorganic sulfide and total sulfur in coal are high correlated with the first factor. Trace elements Be, sulfate and organic sulfide are high correlated with the second factor and trace elements Cr and As are high correlated with the third factor. The factors can be interpreted by the chemical properties of these elements.
Joint Network and LDPC Coding for Bi-directional Relaying
Xiaofu Wu,Weijun Zeng,Chunming Zhao,Xiaohu You
Mathematics , 2011,
Abstract: In this paper, we consider joint network and LDPC coding for practically implementing the denosie-and-forward protocol over bi-directional relaying. the closed-form expressions for computing the log-likelihood ratios of the network-coded codewords have been derived for both real and complex multiple-access channels. It is revealed that the equivalent channel observed at the relay is an asymmetrical channel, where the channel input is the XOR form of the two source nodes.
Design and Implementation of QPSK Optimal Band Transmission System Based on Software Programming  [PDF]
Luyong Ren, Xiaohu Ma
Journal of Computer and Communications (JCC) , 2021, DOI: 10.4236/jcc.2021.99004
Abstract: The manuscript developed an optimal frequency band transmission system structure of QPSK. The software programming experiment of this complete QPSK optimal band transmission system is designed and realized based on Matlab. The experimental parameters used in the design are consistent with the requirements of the actual system parameters. The key code of the software design is given in each module of the system. The whole system is simulated. The simulation results show that the QPSK optimal band transmission system can achieve the best reception performance and realize its function.
Recent Results of psi(2S) Decays at BES
XiaoHu Mo
Physics , 2003, DOI: 10.1063/1.1799690
Abstract: Using 14 million psi(2S) data sample collected with BES at BEPC, psi(2S)-> VT, K_long K_short(also J/psi -> K_long K_short), and chi_cJ -> Baryon anti-Baryon decays are measured and compared with theoretical model predications.
Influence of the Working Gas Properties on the Anode Wire Modulation Effect of MWPC
Xiaohu Wang
Physics , 2015, DOI: 10.1088/1674-1137/39/10/106001
Abstract: For MWPC used for X-ray position detection, simulation study of the anode wire modulation effect of the detector was carried out with Garfield program. Different gas mixtures were used as the working gas in the simulation, so as to obtain the influence of the X-ray cross section and electron diffusion coefficient of the working gases on the anode wire modulation effect of MWPC which has a anode wire spacing of 2mm. Results show that, though working gas with higher X-ray cross section implies a larger average drift distance of ionized electrons, using of such gas mixtures is of little use to improve the anode wire modulation effect of MWPC. And the transverse electron diffusion coefficient is the determining factor that affects the extent of the anode wire modulation effect of the detector.
On Two Cryogenic Systems of High Purity Germanium Detector  [PDF]
Jianyong Zhang, Xiao Cai, Xiaohu Mo
Detection (Detection) , 2013, DOI: 10.4236/detection.2013.12003
Abstract: Two cryogenic systems of high purity germanium detector, liquid nitrogen and mechanical cooler, are expounded, to- gether with explanations of merits and demerits for each kind of cooling methods. The resolutions of detector to the characteristic lines of 152Eu under different cooling conditions are studied. The laboratory results indicate that the me- chanical cooler (X-Cooler II) is an ideal replacement candidate for the liquid nitrogen cooling system that is being util- ized by BEMS at BEPC-II.
Study of Annealing the Damaged HPGe Detector  [PDF]
Jianyong Zhang, Xiaohu Mo, Xiao Cai
World Journal of Nuclear Science and Technology (WJNST) , 2021, DOI: 10.4236/wjnst.2021.112007
Abstract: High purity germanium detectors have important applications in many fields. Detector’s performance deteriorated significantly due to radiation of neutron. The annealing of damaged HPGe detector is expounded in this monograph. The experiment results indicate that raising the temperature to 70°C for five days, the restoration efficiency can reach 90%.
ParticleCall: A particle filter for base calling in next-generation sequencing systems
Xiaohu Shen, Haris Vikalo
BMC Bioinformatics , 2012, DOI: 10.1186/1471-2105-13-160
Abstract: In this paper, we consider Illumina’s sequencing-by-synthesis platform which relies on reversible terminator chemistry and describe the acquired signal by reformulating its mathematical model as a Hidden Markov Model. Relying on this model and sequential Monte Carlo methods, we develop a parameter estimation and base calling scheme called ParticleCall. ParticleCall is tested on a data set obtained by sequencing phiX174 bacteriophage using Illumina’s Genome Analyzer II. The results show that the developed base calling scheme is significantly more computationally efficient than the best performing unsupervised method currently available, while achieving the same accuracy.The proposed ParticleCall provides more accurate calls than the Illumina’s base calling algorithm, Bustard. At the same time, ParticleCall is significantly more computationally efficient than other recent schemes with similar performance, rendering it more feasible for high-throughput sequencing data analysis. Improvement of base calling accuracy will have immediate beneficial effects on the performance of downstream applications such as SNP and genotype calling.ParticleCall is freely available at https://sourceforge.net/projects/particlecall webcite.
Empowering Ubiquitous Services in Next-generation Smart Homes
Ge Xiaohu,Zhu Guangxi
Information Technology Journal , 2006,
Abstract: This study proposes an architecture which integrates ad-hoc network and OSGi framework to support the ubiquitous services in next-generation smart home. The new architecture includes three-level network entities, each of which has its own capability and infrastructure. In order to realize information communication in the new architecture, a new model of protocols stack has been designed. As a result, a solution of ubiquitous services in smart home has been described in this study.
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