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Tidal current turbine based on hydraulic transmission system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第7期12卷 511-518页

作者： hong-wei liu wei LI Yong-gang LIN Shun MA State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

Tidal current turbines(TCTs) are newly developed electricity generating *** at the stabilization of the power output of TCTs,this paper introduces the hydraulic transmission technologies into *** hydrodynamics of the turbine was analyzed at first and its power output characteristics were predicted.A hydraulic power transmission system and a hydraulic pitch-controlled system were *** related simulations were ***,a TCT prototype was manufactured and tested in the *** test results have confirmed the correctness of the current design and availability of installation of the hydraulic system in TCTs.

关键词： Tidal current turbines(TCTs) Hydraulic power transmission Hydraulic pitch-controlled system Workshop test

A Feasible Decomposition Method for Constrained Equations and Its Application to Complementarity Problems

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Acta Mathematicae Applicatae Sinica 2011年第3期27卷 535-548页

作者： Xiang-li Li hong-wei liu Chang-he liu Department of Mathematics Xidian University Xian 710071 China Department of Applied Mathematics Henan University of Science and Technology Luoyang 471003 China

In this paper, by analyzing the propositions of solution of the convex quadratic programming with nonnegative constraints, we propose a feasible decomposition method for constrained equations. Under mild conditions, the global convergence can be obtained. The method is applied to the complementary problems. Numerical results are also given to show the efficiency of the proposed method.

关键词： convex quadratic programming nonnegative constraints feasible decomposition method

Pt–C interactions in carbon-supported Pt-based electrocatalysts

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1677-1697页

作者： Yu-Xuan Xiao Jie Ying hong-wei liu Xiao-Yu Yang School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology(Qingdao) Wuhan University of TechnologyWuhan 430070China

Carbon-supported Pt-based materials are highly promising *** carbon support plays an important role in the Pt-based catalysts by remarkably influencing the growth,particle size,morphology,dispersion,electronic structure,physiochemical property and function of *** review summarizes recent progress made in the development of carbon-supported Pt-based catalysts,with special emphasis being given to how activity and stability enhancements are related to Pt–C interactions in various carbon supports,including porous carbon,heteroatom doped carbon,carbon-based binary support,and their corresponding electrocatalytic ***,the current challenges and future prospects in the development of carbon-supported Pt-based catalysts are discussed.

关键词： Pt-C interactions Pt-based materials carbon support electrocatalysis

Thin-layer heap bioleaching of copper flotation tailings containing high levels of fine grains and microbial community succession analysis

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International Journal of Minerals,Metallurgy and Materials 2017年第4期24卷 360-368页

作者： Xiao-dong Hao Yi-li Liang Hua-qun Yin hong-wei liu wei-min Zeng Xue-duan liu School of Minerals Processing and Bioengineering Central South University Changsha 410083 China Key Laboratory of Biometallurgy of Ministry of Education Central South University Changsha 410083 China

Thin-layer heap bioleaching of copper flotation tailings containing high levels of fine grains was carried out by mixed cultures on a small scale over a period of 210 d. Lump ores as a framework were loaded at the bottom of the ore heap. The overall copper leaching rates of tailings and lump ores were 57.10wt% and 65.52wt%, respectively. The dynamic shifts of microbial community structures about attached microorganisms were determined using the Illumina MiSeq sequencing platform based on 16S rRNA amplification strategy. The results indicated that chemolithotrophic genera Acidithiobacillus and Leptospirillum were always detected and dominated the microbial community in the initial and middle stages of the heap bioleaching process; both genera might be responsible for improving the copper extraction. However, Thermogymnomonas and Ferroplasma increased gradually in the final stage. Moreover, the effects of various physicochemical parameters and microbial community shifts on the leaching efficiency were further investigated and these associations provided some important clues for facilitating the effective application of bioleaching. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Bioleaching Copper Flotation Leaching Microorganisms RNA Tailings

Efficient anti-aliasing and anti-leakage Fourier transform for high-dimensional seismic data regularization using cube removal and GPU

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Petroleum Science 2024年第5期21卷 3079-3089页

作者： Lu liu Sindi Ghada Fu-Hao Qin Youngseo Kim Vladimir Aleksic hong-wei liu Aramco Research Center-Beijing Beijing100102China KAUST Research Center Group Saudi AramcoThuwal23955-6900Saudi Arabia EXPEC Advanced Research Center Saudi AramcoDhahran31311Saudi Arabia Geophysical Imaging Department Saudi AramcoDhahran31311Saudi Arabia National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina

Seismic data is commonly acquired sparsely and irregularly, which necessitates the regularization of seismic data with anti-aliasing and anti-leakage methods during seismic data processing. We propose a novel method of 4D anti-aliasing and anti-leakage Fourier transform using a cube-removal strategy to address the combination of irregular sampling and aliasing in high-dimensional seismic data. We compute a weighting function by stacking the spectrum along the radial lines, apply this function to suppress the aliasing energy, and then iteratively pick the dominant amplitude cube to construct the Fourier spectrum. The proposed method is very efficient due to a cube removal strategy for accelerating the convergence of Fourier reconstruction and a well-designed parallel architecture using CPU/GPU collaborative computing. To better fill the acquisition holes from 5D seismic data and meanwhile considering the GPU memory limitation, we developed the anti-aliasing and anti-leakage Fourier transform method in 4D with the remaining spatial dimension looped. The entire workflow is composed of three steps: data splitting, 4D regularization, and data merging. Numerical tests on both synthetic and field data examples demonstrate the high efficiency and effectiveness of our approach.

关键词： High-dimensional regularization GPU Anti-aliasing Anti-leakage

A Synergistic Acceleration of Corrosion of Q235 Carbon Steel Between Magnetization and Extracellular Polymeric Substances

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Acta Metallurgica Sinica(English Letters) 2018年第5期31卷 456-464页

作者： hong-wei liu Da-Ke Xu Bi-Juan Zheng Muhammad Asif Fu-Ping Xiong Guo-An Zhang hong-Fang liu Key Laboratory for Large-Format Battery Materials and System Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Institute of Metal Research Chinese Academy of Sciences

In this work, surface characterization and electrochemical measurement were employed to investigate the effects of magnetic field（MF） on the corrosion of Q235 carbon steel in a NaCl solution containing sulphate-reducing bacteria（SRB） or extracellular polymeric substances（EPS）. Results demonstrated that a 150 mT MF enhanced steel corrosion in a SRB-containing NaCl solution by 202% calculated from weight loss with pitting corrosion as the main corrosion *** EPS or MF rendered steel corrosion, but a synergistic interaction between MF and EPS boosted up steel *** synergistic enhancement could be referred to the alteration in orientation of EPS induced by MF. The presence of higher percentage of chloride ions on the carbon steel surface manifested that MF initiated the erosion of chloride ions on the carbon steel coupon.

关键词： Sulphate-reducing bacteria Magnetic field Extracellular polymeric substances Microbiologically influenced corrosion

An Efficient Inexact Newton-CG Algorithm for the Smallest Enclosing Ball Problem of Large Dimensions

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Journal of the Operations Research Society of China 2016年第2期4卷 167-191页

作者： Ya-Feng liu Rui Diao Feng Ye hong-wei liu State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific/Engineering ComputingAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China Department of Applied Mathematics Xidian UniversityXi’an 710071China

In this paper,we consider the problem of computing the smallest enclosing ball(SEB)of a set of m balls in Rn,where the product mn is *** first approximate the non-differentiable SEB problem by its log-exponential aggregation function and then propose a computationally efficient inexact Newton-CG algorithm for the smoothing approximation problem by exploiting its special(approximate)sparsity *** key difference between the proposed inexact Newton-CG algorithm and the classical Newton-CG algorithm is that the gradient and the Hessian-vector product are inexactly computed in the proposed algorithm,which makes it capable of solving the large-scale SEB *** give an adaptive criterion of inexactly computing the gradient/Hessian and establish global convergence of the proposed *** illustrate the efficiency of the proposed algorithm by using the classical Newton-CG algorithm as well as the algorithm from Zhou et al.(Comput Optim Appl 30:147–160,2005)as benchmarks.

关键词： Smallest enclosing ball Smoothing approximation Inexact gradient Inexact Newton-CG algorithm Global convergence

Aging precipitation characteristics and tensile properties of Al-Zn-Mg-Cu alloys with different additional Zn contents

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Rare Metals 2021年第8期40卷 2160-2166页

作者： Kai Wen Bai-Qing Xiong Yong-An Zhang Xi-Wu Li Zhi-Hui Li Li-Zhen Yan hong-wei Yan hong-wei liu State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.LTD.Beijing101407China GRINM Group Co. LTD.Beijing100088China

The increase in zinc content in Al-Zn-Mg-Cu alloys provides an effective method to enhance the *** electron microscopy(TEM)and tensile test were employed to analyze the microstructure and tensile properties,respectively,of Al-9.3 Zn-2.0 Mg-1.8 Cu alloy(9.3 Zn alloy)and Al-9.8 Zn-2.0 Mg-1.8 Cu alloy(9.8 Zn alloy)with single-and double-stage aging *** results showed that the two alloys possessed a closed strength under single-stage peak-aging *** for double-stage aging treatment,9.8 Zn alloy had a higher strength values than 9.3 Zn alloy under the same aging *** the second step aging time prolonging,the strength gap was *** main precipitates for the two alloys with single-stage peak-aging state were GP zones andη’phase,while there were a majority ofη’phases andηphases for the two alloys under typical double-stage over-aging *** double-stage overaging state,the proportion of precipitate with large size for9.3 Zn alloy was larger than that for 9.8 Zn ***,a more obvious trend was revealed for the double-stage overaging *** gap of strength between the two alloys was explained by the difference of precipitation characteristics via interaction mechanism between precipitates and dislocations.

关键词： Zn content Al-Zn-Mg-Cu alloy Precipitation characteristics Tensile properties

A New Furostanol Saponin from Dioscorea futshauensis

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Chinese Chemical Letters 2002年第3期13卷 241-244页

作者： hong wei liu Ge Xia QU Xin Sheng YAO Department of Natural Products Chemistry Shenyang Pharmaceutical UniversityShenyang 110015

A new furostanol saponin presenting moderate bioactivity of inducing morphological deformation of Pyricularia oryzae mycelia was isolated from Dioscorea futshauensis *** by bioactivity-guided fractionation. The structure was established as 26-O-b-D-glucopyranosyl-3b, 26-diol-23(S)-methoxyl-(25R)-furost-5,20 (22)-diene-3-O-[a-L-rhamnopyranosyl (12)-b-D- glucopyranosyl (13)]-b-D-glucopyranoside on the basis of chemical evidencesand spectral analysis, especially by 2D-NMR techniques.

关键词： Furostanol glycoside Dioscorea futshauensis Pyricularia oryzae.