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SH-wavefield simulation for a laterally heterogeneous whole-Earth model using the pseudospectral method

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Science China Earth Sciences 2011年第12期54卷 1940-1947页

作者： wang yanbin TAKENAKA Hiroshi Department of Geophysics School of Earth and Space Sciences Peking University Beijing 100871 China Department of Earth and Planetary Sciences Kyushu University Hakozaki 6-10-1 Fukuoka 812-8581 Japan

We present a scheme to simulate SH-wave propagation in a whole-Earth model with arbitrary lateral heterogeneities employing the Fourier pseudospectral method. Wave equations are defined in two-dimensional cylindrical coordinates and the model is taken through a great circle of the Earth. Spatial derivatives in the wave equations are calculated in the wavenumber domain by multiplication, and the transformation between spatial and wavenumber domains is performed via fast Fourier transformation. Because of the high accuracy and high speed of the Fourier pseudospectral method, the scheme enables us to calculate a short-wavelength global SH-wavefield with accurate waveforms and arrival times for models with heterogeneities that can be approximated as azimuthally symmetric. Comparing with two-dimensional simulation methods based on an axisymmetric model, implementing the seismic source in the present scheme is more convenient. We calculated the global SH-wavefield for the preliminary reference Earth model to identify the generation, reflection and refraction of various seismic phases propagating in the Earth. Applications to a heterogeneous global model with low-velocity perturbation above the core-mantle boundary were conducted to analyze the effect of lateral heterogeneity on global SH-wave propagation.

关键词： wave propagation computational seismology pseudospectral method global seismology core-mantle boundary

Exploring the H-abstraction reactions of CHCl^(·-)/CCl_2^(·-) with CX_3H(X = F,Cl,Br and I) using the density functional theory method

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Science China Chemistry 2012年第7期55卷 1384-1394页

作者： LIANG JunXi wang yanbin GENG ZhiYuan College of Chemical Engineering Northwest University for NationalitiesLanzhou 730030China Gansu Key Laboratory of Polymer Materials College of Chemistry and Chemical Engineering Key Laboratory of Eco-environment-related Polymer Materials Ministry of EducationNorthwest Normal UniversityLanzhou 730070China

Gas-phase hydrogen abstraction reactions have been compared using the popular density functional theory （DFT） functional BHandHLYP/aug-cc-pVTZ/RECP level of theory, on the basis of the model reaction CHCI-/CCl2- ＋ CX3H （X = F, Cl, Br and I）. Our theoretical findings suggest the efficiency of the H-abstraction reactions induced by either CHCl- or CCl2- increases as the substrate is changed from CF3H to Cl3H, and that CHCI＇-has a higher activity in hydrogen abstraction than CCl2- for a given substrate. The entropy effect at 298 K does not significantly change the trend in reactivity of the various reactions, which is in general controlled by the heights of activation energies △E＂. Therefore, we have explored the origin of the energy barriers △E＂ of the reactions using the activation strain model of chemical reactivity.

关键词： carbene radical anion Hydrogen-abstraction reaction density functional theory (DFT)

A survey of current trends in computational predictions of protein-protein interactions

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Frontiers of Computer Science 2020年第4期14卷 1-12页

作者： yanbin wang Zhuhong YOU Liping LI Zhanheng CHEN Xinjiang Technical Institutes of Physics and Chemistry Chinese Academy of ScienceUrumqi830011China University of Chinese Academy of Sciences Beijing100049China

Proteomics become an important research area of interests in life science after the completion of the human genome *** scientific is to study the characteristics of proteins at the large-scale data level,and then gain a holistic and comprehensive understanding of the process of disease occurrence and cell metabolism at the protein level.A key issue in proteomics is how to efficiently analyze the massive amounts of protein data produced by high-throughput *** technologies with low-cost and short-cycle are becoming the preferred methods for solving some important problems in post-genome era,such as protein-protein interactions(PPIs).In this review,we focus on computational methods for PPIs detection and show recent advancements in this critical area from multiple ***,we analyze in detail the several challenges for computational methods for predicting PPIs and summarize the available PPIs data ***,we describe the state-of-the-art computational methods recently proposed on this ***,we discuss some important technologies that can promote the prediction of PPI and the development of computational proteomics.

关键词： proteomics protein-protein interactions protein feature extraction computational proteomics

Longitudinal Vibration Analysis of Marine Riser During Installation and Hangoff in Ultra Deepwater

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Computer Modeling in Engineering & Sciences 2016年第4期111卷 357-373页

作者： yanbin wang Deli Gao Jun Fang MOE Key Laboratory of Petroleum Engineering China University of PetroleumBeijing102249China

This paper is concerned with the problem of longitudinal vibration of a 3,000 m long disconnected drilling riser during installation and hangoff *** natural frequency,amplitude of vibration displacement and vibration force of longitudinal vibration have been determined with consideration of the damping effect of the sea *** show the natural frequency of riser under these two situations are both decrease with the increase of water *** natural frequency of riser in installation operation is bigger than that in hangoff *** vibration displacement in hangoff configuration is bigger than that in installation while the vibration force in hangoff configuration is smaller than that in installation *** the condition of resonance,the vibration displacement increase along riser from top end to the bottom end while the vibration force increase along riser from riser bottom end to the top end.

关键词： Marine riser Installation Hangoff Longitudinal vibration

Irradiation effect of hot electronic beams on parylene films

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Nuclear Science and Techniques 2013年第B12期24卷 38-42页

作者： wang yanbin CHEN Zhimei CHANG Guanjun The Research Center of Laser Fusion in CAEP MianYang 621900 China

The multi-layer parylene (PP) films were irradiated by hot electrons with a dose of 2x10(16) cm(-2). The irradiated and non-irradiated films have been examined by FT IR, UN-Vis and strain-stress measurement instruments. The results show that the damage has been created for irradiated films, including benzene rings and broken C-C bonds. The absorbance on the vision light increases and the Yang's modulus decreases greatly in irradiated films with the worse toughness. The experimental conditions determine whether these effects hinder hydrodynamic instability or not.

关键词：聚对二甲苯薄膜辐照效应电子束 UV-Vis FT-IR 流体动力学测量仪器实验条件

Enhanced remediation of Cr(Ⅵ)-contaminated groundwater by coupling electrokinetics with ZVI/Fe_(3)O_(4)/AC-based permeable reactive barrier

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Journal of Environmental Sciences 2022年第2期34卷 280-290页

作者： Ruolin Cao Shiqing Liu Xinyu Yang Chunfeng wang yanbin wang Wanfeng wang Yunqing Pi Henan Key Laboratory for Environmental Pollution Control and Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control(Ministry of Education) School of EnvironmentHenan Normal UniversityXinxiang 453007China

Although widely used in permeation reaction barrier(PRB)for strengthening the removal of various heavy metals,zero-valent iron(ZVI)is limited by various inherent drawbacks,such as easy passivation and poor electron *** a solution,a synergistic system with PRB and electrokinetics(PRB-EK)was established and applied for the efficient removal of Cr(Ⅵ)-contaminated *** the filling material of PRB,ZVI/Fe_(3)O_(4)/activated carbon(ZVI/Fe_(3)O_(4)/AC)composites were synthesized by ball milling and thermal treatment.A series of continuous flow column experiments and batch tests was conducted to evaluate the removal efficiency of Cr(Ⅵ).Results showed that the removal efficiency of Cr(Ⅵ)remained above 93%even when the bed volume(BV)reached 2000 under the operational parameters(iron/AC mass ratio,2:1;current,5 m A).The mechanism of Cr(Ⅵ)removal by the PRB-EK system was revealed through field emission scanning electron microscopy images,X-ray diffraction,X-ray photoelectron spectroscopy,Fe^(2+) concentration,and redox potential(E h)*** key in Cr(Ⅵ)reduction was the Fe^(2+)/Fe^(3+) cycle driven by the surface microelectrolysis of the *** application of an externally supplied weak direct current maintained the redox process by enhancing the electron transfer capability of the system,thereby prolonging the column ***(Ⅵ)chemical speciation was determined through sequential extraction,verifying the stability and safety of the *** findings provide a scientific basis for PRB design and the in-situ remediation of Cr(Ⅵ)-contaminated groundwater.

关键词： ZVI/Fe_(3)O_(4)/AC Electrokinetics Micro-electrolysis Cr(Ⅵ)-continuous ground water Zero-valent iron

A scheme to treat the singularity in global seismic wavefield simulation using pseudospectral method with staggered grids

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Earthquake Science 2010年第2期23卷 121-127页

作者： yanbin wang Hiroshi Takenaka Department of Geophysics School of Earth and Space Sciences Peking University Beijing 100871 China Department of Earth and Planetary Sciences Kyushu University Hakozaki 6-10-1 Fukuoka 812-8581 Japan

The pseudospectral method has been applied to the simulation of seismic wave propagation in 2-D global Earth model. When a whole Earth model is considered, the center of the Earth is included in the model and then singularity arises at the center of the Earth where r=0 since the 1/r term appears in the wave equations. In this paper, we extended the global seismic wavefield simulation algorithm for regular grid mesh to staggered grid configuration and developed a scheme to solve the numerical problems associated with the above singularity for a 2-D global Earth model defined on staggered grid using pseudospectral method. This scheme uses a coordinate transformation at the center of the model, in which the field variables at the center are calculated in Cartesian coordinates from the values on the grids around the center. It allows wave propagation through the center and hence the wavefield at the center can be stably calculated. Validity and accuracy of the scheme was tested by compared with the discrete wavenumber method. This scheme could also be suitable for other numerical methods or models parameterized in cylindrical or spherical coordinates when singularity arises at the center of the model.

关键词： seismic modeling wave propagation whole Earth pseudospectrai method staggered grid

In silico prediction methods of self-interacting proteins:an empirical and academic survey

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Frontiers of Computer Science 2023年第3期17卷 199-216页

作者： Zhanheng CHEN Zhuhong YOU Qinhu ZHANG Zhenhao GUO Siguo wang yanbin wang College of Computer Science and Software Engineering Shenzhen UniversityShenzhen 518060China School of Computer Science Northwestern Polytechnical UniversityXi’an 710129China Institute of Machine Learning and Systems Biology School of Electronics and Information EngineeringTongji UniversityShanghai 201804China School of Cyber Science and Technology Zhejiang UniversityHangzhou 310058China

In silico prediction of self-interacting proteins(SIPs)has become an important part of *** is an urgent need to develop effective and reliable prediction methods to overcome the disadvantage of high cost and labor intensive in traditional biological wet-lab *** goal of our survey is to sum up a comprehensive overview of the recent literature with the computational SIPs prediction,to provide important references for actual work in the *** this review,we first describe the data required for the task of DTIs ***,some interesting feature extraction methods and computational models are presented on this topic in a timely ***,an empirical comparison is performed to demonstrate the prediction performance of some classifiers under different feature extraction and encoding ***,we conclude and highlight potential methods for further enhancement of SIPs prediction performance as well as related research directions.

关键词： proteomics self-interacting proteins feature extraction prediction model

One-step synthesis of recoverable CuCo2S4 anode material for high-performance Li-ion batteries

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Frontiers of Chemical Science and Engineering 2020年第4期14卷 595-604页

作者： Tongzhou Lu Yongzheng Zhang Chun Cheng yanbin wang Yongming Zhu Department of Applied Chemistry Harbin Institute of Technology at WeihaiWeihai 264209China

A facile one-step hydrothermal method has been adopted to directly synthesize the CuCo2S4 material on the surface of Ni *** to the relatively large specific surface area and wide pore size distribution,the CuCo2S4 material not only effectively increases the reactive area,but also accommodates more side reaction products to avoid the difficulty of mass *** evaluated as anode for Li-ion batteries,the CuCo2S4 material exhibits excellent electrochemical performance including high discharge capacity,outstanding cyclic stability and good rate *** the current density of 200 mA·g^-1,the CuCo2S4 material shows an extremely high initial discharge capacity of 2510 mAh·g^-1,and the cycle numbers of the material even reach 83 times when the discharge capacity is reduced to 500 mAh·g^-***,the discharge capacity can reach 269 mAh·g^-1 at a current of 2000 mA·g^-*** importantly,when the current density comes back to 200 mA·g^-1,the discharge capacity could be recovered to 1436 mAh·g^-1,suggesting an excellent capacity recovery characteristics.

关键词： copper cobalt sulfide recoverability one-step hydrothermal method anode material Li-ion battery