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ANOMALOUS EFFECT OF PRESSURE ON ThE CURIE TEMPERATURE IN MEChANICALLY ALLOYED Fe-Ni INVAR

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Acta Metallurgica Sinica(English Letters) 2007年第3期20卷 205-209页

作者： X.h. wei F. Ono Department of Electronic Science Huizhou University Huizhou 516007 China Department of Physics Okayama University 3-1-1 Tsushima-Naka Okayama 700-8530 Japan

Measurements of magnetic susceptibility in mechanically alloyed Fe-Ni Invar alloys were taken under pressures up to 7.5GPa. The rate of decrease in the Curie temperature for 700℃ annealed specimen was larger than that annealed at 1000℃. This result can be explained by considering the fact that the width of the concentration fluctuation becomes larger in the specimen annealed at lower temperature.

关键词： invar alloy Fe-Ni, mechanical alloying Curie temperature

A Fourth-Order Modified Method for the Cauchy Problem of the Modified helmholtz Equation

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Numerical Mathematics(Theory,Methods and Applications) 2009年第3期2卷 326-340页

作者： R. Shi T. wei h. h. Qin School of Mathematics and Statistics Lanzhou University Lanzhou 730000 China.

This paper is concerned with the Cauchy problem for the modified helmholtz equation in an infinite strip domain 0hy data at x = 0 is given and the solution is then sought for the interval 0highly ill-posed and the solution(if it exists) does not depend continuously on the given data. In this paper,we propose a fourth-order modified method to solve the Cauchy problem. Convergence estimates are presented under the suitable choices of regularization parameters and the a priori assumption on the bounds of the exact *** implementation is considered and the numerical examples show that our proposed method is effective and stable.

关键词： Cauchy problem for the modified helmholtz equation ill-posed problem fourth-ordermodified method.

Real-time vehicle-to-grid control for frequency regulation with high frequency regulating signal

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Protection and Control of Modern Power Systems 2018年第1期3卷 151-158页

作者： h.Liu K.huang Y.Yang h.wei S.Ma College of Electrical Engineering Guangxi UniversityNanning 530004China China Electric Power Research Institute Beijing 100192China

The large-scale popularization of electric vehicles(EVs)brings the potential for grid frequency *** the characteristics of fast response and adjustment of EVs,two control strategies of automatic generation control(AGC)with EVs are proposed responding to two high frequency regulating signals extracted from area control error(ACE)and area regulation requirement(ARR)by a digital filter,*** order to dispatch regulation task to EVs,the capacity of regulation is calculated based on maximum V2G power and the present V2G power of ***,simulations based on a two-area interconnected power system show that the proposed approaches can significantly suppress frequency deviation and reduce the active power output of traditional generation units.

关键词： Area control error(ACE) Automatic generation control(AGC) Electric vehicle Frequency regulation high frequency regulating signal

Synthesis of Ni nanowires via a hydrazine reduction route in aqueous ethanol solutions assisted by external magnetic fields

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Nano-Micro Letters 2009年第1期1卷 49-52页

作者： L.Y.Zhang J.Wang L.M.wei P.Liu h.wei Y.F.Zhang National Key Laboratory of Nano/Micro Fabrication Technology Key Laboratory for Thin Film and Microfabrication of Ministry of Education Institute of Micro and Nano Science and Technology Shanghai Jiao Tong University

One-dimensional Ni nanostructures were synthesized via a hydrazine reduction route under external magnetic fields. The mixture of de-ionized water and ethanol was used as the reaction solvent and hydrazine hydrate as reducing agents. The morphology and properties of Ni nanostructures were characterized by X-ray diffractometer(XRD), scanning electron microscopy(SEM), and vibrating sample magnetometer(VSM). It was found that the magnetic field strength, concentration of Ni ions,reaction time and temperature as well as p h values played key roles on formation, microstructures and magnetic properties of Ni nanowires. The optimal wires have diameter of ~200 nm and length up to ~200 μm. And their coercivity is ~260 Oe, which is much larger than the commercial Ni powders of 31 Oe. This work presents a simple, low-cost, environment-friendly and large-scale production approach to fabricate one-dimensional magnetic materials. The resulting materials may have potential applications in conductive filters, magnetic sensors and catalytic agents.

关键词： Ni fiber hydrazine reduction Magnetic field Magnetic properties

Revisiting Triassic stratigraphy of the Yanshan belt

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Science China Earth Sciences 2015年第3期58卷 491-501页

作者： wei honghong WU GuoLi DUAN Liang Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences

Age determinations of the Triassic lithostratigraphic units of the Yanshan belt were previously based on plant fossils and regional correlations of lithologies. The Liujiagou and heshanggou Formations were assigned as the Lower Triassic, and the Ermaying Formation was regarded as the Middle Triassic. We carried out a geochronologic study of detrital zircon grains from the Triassic sandstone in the Xiabancheng and Yingzi basins in northern hebei where the Triassic strata are exceptionally well preserved. The results show that the Liujiagou, heshanggou, and Ermaying Formations are all Late Triassic in age. The ages of detrital zircons also revealed that the upper part of the Shihezi Formation and the overlying Sunjiagou Formation, both of which were thought to be the Middle-Late Permian units, are actually late Early to Middle Triassic deposits. This study combines the upper Shihezi and Sunjiagou Formations into a single unit termed as the Yingzi Formation. We also substitute the widely-used Liujiagou, heshanggou, and Ermaying Formations with the Dingjiagou, Xiabancheng, and huzhangzi Formations, respectively. Field observations and facies analysis show that the top of the Shihezi Formation is an erosive surface, marking a parallel unconformity between the Middle Permian and Lower Triassic. The Yingzi Formation is composed mainly of meandering river deposits, indicative of tectonic quiescence and low-relief landform in the Early to Middle Triassic. In contrast, the Dingjiagou, Xiabancheng, and huzhangzi Formations are interpreted as the deposits of sandy/gravelly braided rivers, alluvial fans, fan deltas, and deep lakes in association with volcanism, thus indicating an intense rifting setting. A new Triassic lithostratigraphic division is proposed according to age constraints and facies analysis, and the results are of significance for understanding the early Mesozoic tectonic evolution of the Yanshan belt.

关键词： Yanshan belt Triassic detrital zircon LA-MC-ICPMS dating sedimentation

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CALCULATION OF SECOND PhASE PARTICLE-GRAIN BOUNDARY INTERACTION RANGE

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Acta Metallurgica Sinica(English Letters) 2008年第1期21卷 8-14页

作者： X.L. Wang Y.h. wei W. Wang L.F. hou College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China Baosteel Technology Center Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Manuscript received 20 December 2006

On the basis of the grain boundary equation by heUman and corresponding analysis of Worner, this article deals with the interaction range between the second-phase particle （SPP） and grain boundary （GB） as viewed from the applicability of grain boundary equation. Also, a new expression describing the interaction range has been derived, which solves the problem in theory that the interaction range between SPP and GB can only be qualitatively analyzed previously. It is shown that given the interaction position between SPP and GB, the interaction range can be quantitatively determined by use of this expression.

关键词： Second-phase particle Grain boundary Pinning force Surface free energy

Mechanical Properties of a Low-thermal-expansion Aluminum/Silicon Composite Produced by Powder Metallurgy

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Journal of Materials Science & Technology 2014年第4期30卷 417-422页

作者： Y.Q.Liu S.h.wei J.Z.Fan Z.L.Ma T.Zuo National Engineering & Technology Research Center for Nonferrous Metal Matrix Composites Beijing General Research Institute for Nonferrous Metals

AI matrix composite containing high volume fraction silicon has been promising candidate for lightweight and low-thermal-expansion components. Whereas, optimization of its mechanical properties still is an open challenge. In this article, a flexile powder metallurgy processing was used to produce a fully dense AI-4.0Cu （wt%） alloy composite reinforced with 65 vol.% Si particles. In this composite, Si particles were homogenously distributed, and the particle size was refined to the range of 3-15 μm. Tensile and flexural strength of the composite were 282 and 455 MPa, respectively, about 100% and 50% higher than the best properties reported in literature. The measured fracture toughness of the composite was 4.90 MPa m1/2. The improved strength of 65%Si/AI was attributed to the optimized particle characteristics and matrix properties. This investigation is expected to provide a primary understanding of the mechanical behaviors of Si/AI composites, and also promote the structural applications of this low-thermal-expansion material.

关键词： Aluminum matrix composite Powder metallurgy Mechanical properties Coefficient of thermal expansion Fracture

A　New　Resonator　With　A　Non─misaligned　FourMirorReflectorAndItsEfectOnBeamQualityImprovementOfhighAveragePowerNd：YAGLasers

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光学技术 1996年第5期 47-49页

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关键词： interference filtering beam quality high average power Nd:YAG lasers

Superhydrophobic and superlipophilic biochar produced from microalga torrefaction and modification for upgrading fuel properties

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Biochar 2023年第1期5卷 334-348页

作者： Congyu Zhang Meng Wang wei-hsin h.Chen Ying Zhang Anelie Pétrissans Mathieu Pétrissans Shih-hsin h.ho State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbinChina School of Resources and Environment Northeast Agricultural University150030 HarbinChina Department of Aeronautics and Astronautics National Cheng Kung University701 TainanTaiwanChina Research Center for Smart Sustainable Circular Economy Tunghai University407 TaichungTaiwanChina Department of Mechanical Engineering National Chin-Yi University of Technology411 TaichungTaiwanChina Universitéde Lorraine INRAELERMAB88000 EpinalFrance

Torrefaction operation is an essential pathway for solid biofuel upgrading,and good hydrophobicity of torrefied biochar is conducive to its ***,a two-stage treatment of torrefaction followed by modification by hexadecyltrimethoxysilane was adopted to improve the moisture resistance performance of *** two-stage treatment process led to a longer torrefied microalgal biochar preservation time(60-200%improved)and great superhydrophobicity and ***,the modified microalgal biochar could significantly adsorb leaking oil for environmental remediation and further improve the calorific value of the *** obtained results indicated that the oil adsorption capacity of modified microalgal biochar was correlated to torrefaction temperature and oil ***,the oil adsorption capacity was enhanced up to 70-80%from the modification process when comparing to raw *** the torrefaction temperature enhanced the adsorption quantity of the modified microalgal *** adsorbing the oil,the calorific value of oilchar,namely,biochar with adsorbed oil,could be higher than 40 MJ kg^(−1).Furthermore,the pyrolysis and combustion characteristics suggested that biochar stability gradually rose as the torrefaction temperature *** comprehensively analyzing and comparing the fuel performance of the modified microalgal biochar with previous literature,the obtained modified microalgal biochar possessed better fuel properties and environmental sustainability.

关键词： Microalga Torrefaction Biochar Superhydrophobicity Oil adsorption Fuel property