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OSCILLATION CONVERGENT THEOREMS f.R THE V2-INTEGRAL

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Journal of.Mathematical Study 1994年第1期 89-91页

作者： LI BAOLINGG. f. DOMANTARY(Northwest Normal University Lanzou China 730070)(Scince and Technogy Pangasinar State University Phliippines)

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关键词： V2-integral monotone convegence Oscillation convergence.

DISCREPANCIES IN THE REGRESSION MODELLING Of.RECRYSTALLIZATION RATE AS USING THE DATA f.OM PHYSICAL SIMULATION TESTS

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Acta Metallurgica Sinica(English Letters) 2004年第3期17卷 221-228页

作者： L.P.Karjalainen M.C.Somani S.f.Medina Department of.Mechanical Engineering University of OuluFIN-90014 OuluFinlandDepartment of Mechanical EngineeringUniversity of OuluFIN-90014 OuluFinlandCentro Nacional de Investigaciones Metallurgicas(CENIM-CSIC) ES-28040 Madrid Spain

The analysis of.numerous experimental equations published in the literature reveals awide scatter in the predictions f.r the static recrystallization kinetics of.steels. Thepowers of.the def.rmation variables, strain and strain rate, similarly as the powerof.the grain size vary in these equations. These dif.erences are highlighted and thetypical values are compared between torsion and compression tests. Potential errorsin physical simulation testing are discussed.

关键词： physical simulation static recrystallization regression modeling hot working steel

Maneuvering Modeling and Simulation of.AUV Dynamic Systems with Euler-Rodriguez Quaternion Method

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China Ocean Engineering 2013年第3期27卷 403-416页

作者： C.W.Chen J.S.Kouh J.f.Tsai Department of.Science Engineering and Ocean Engineering National Taiwan University

The purpose of.this study is to develop maneuvering models and systems of.a simulator to improve the motion perf.rmance of.autonomous underwater vehicles （AUVs） at the preliminary design stages in advance. The AUVs simulation systems based on the standard submarine equations of.motion in six-degree-of.f.eedom （6-DOf. integrated with the Euler-Rodriguez quaternion method f.r representing singularity-f.ee AUV attitude and time-saving calculation, and with a nonlinear control model f.r maneuvering and depth control simulations, time-marching in the f.urth-order Runge-Kutta scheme. f.r validation of.the simulation codes, results of.the ISiMI AUV open-loop tests including turning test and zigzag test as well as an AUV simulator on the basis of.Euler-angle method were used to compare with the quaternion-based AUV simulator. The computational results f.om the proposed simulator agree well with those f.om both the ISiMI AUV experiments and the Euler-angle based simulations. Additionally, a new maneuvering procedure, namely ＂put-out＂ was implemented to test directional stability f.r a large-scale AUV in the proposed AUV simulator that can be considered f.r vehicles in space as well as in constrained planes.

关键词： autonomous underwater vehicle (.4 UV) Euler-Rodriguez quaternion hydrodynamics maneuvering systemdynamics

Remediation of.a Mercury-Contaminated Industrial Soil Using Bioavailable Contaminant Stripping

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Pedosphere 2013年第1期23卷 104-110页

作者： f.PEDRON G.PETRUZZELLI M.BARBAf.ERI E.TASSI National Research Council Institute of Ecosystem Studies

The method to remove bioavailable amounts of.heavy metals f.om a contaminated soil by using plants is def.ned as bioavailable contaminant stripping （BCS） and could saf.ly be applied if.the soil＇s long-term ability to replenish the bioavuilable pool is known. The aim of.this study was to evaluate the ability of.three common plant species selected, Brassica juncea, Poa annua, and Helianthus annus, to remove bioavailable amounts of.mercury （Hg） f.om a contaminated industrial soil containing 15.1 mg kg-1 Hg. Trials were carried out under greenhouse conditions using pots （mesocosms）. According to the precautionary principle, we modif.ed the BCS remediation approach by adding a new step, in which mercury bioavailability was increased by the addition of.a strong mobilizing agent, ammonium thiosulphate, （NH4）28203, to obtain an estimate of.the likely long-term bioavailable Hg pool. The modif.ed BCS remediation approach was called enhanced bioavailable contaminant stripping （EBCS）. Af.er one growth cycle, nearly all the bioavailable mercury （95.7%） was removed and the metal remaining in the soil was considered inert since it was neither extractable by （NH4）2S2O3 nor taken up by plants during a second growth cycle. The results demonstrated that EBCS appeared promising since it removed the most dangerous metal f.rms while substantially shortening the cleanup time.

关键词： heavy metal mercury bioavailability mobilizing agent plant species remediation approach

Numerical analysis of.synthetic granulate deposition in a physical model study

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International Journal of.Sediment Research 2014年第1期29卷 110-117页

作者： Gabriele HARB Stef.n HAUN Joséf.SCHNEIDER Nils Reidar B.OLSEN Institute of.Hydraulic Engineering and Water Resources Management Graz University of Technology Department of.Hydraulic and Environmental Engineering The Norwegian University of Science and Technology

The current study f.cuses on the application of.a three-dimensional numerical model f.r the prediction of.morphological bed *** sediment deposition in a reservoir during a 10-year-f.ood was investigated and the results of.the simulation were validated with data derived f.om a physical model *** of.the small grain sizes in the prototype,synthetic granulate was used in the physical *** numerical computation domain was a reproduction of.the physical model,including the grain sizes and the density of.the particles,in order to ensure *** Cf. code SSIIM,which solves the RANS-equations in three-dimensions,was used f.r the *** sediment transport in SSIIM is divided into suspended sediment transport,computed by solving the convection-dif.usion equation,and bed-load transport,calculated by an empirical *** results of.the numerical simulation correspond well to the results of.the physical model *** simulated location and the pattern of.the sediment deposition in the reservoir are an accurate representation of.the observed distribution in the physical model.

关键词： Physical modeling Numerical modeling RANS-equations Reservoir management Sediment

f.ult on-of. versus strain rate and earthquakes energy

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Geoscience f.ontiers 2015年第2期6卷 265-276页

作者： C.Doglioni S.Barba E.Carminati f.Riguzzi Dipartimento di Scienze della Terra Università Sapienza Istituto di Geologia Ambientale e Geoingegneria CNR Istituto Nazionale di Geof.sica e Vulcanologia

We propose that the brittle-ductile transition （BDT） controls the seismic cycle. In particular, the movements detected by space geodesy record the steady state def.rmation in the ductile lower crust, whereas the stick-slip behavior of.the brittle upper crust is constrained by its larger f.iction. GPS data allow analyzing the strain rate along active plate boundaries. In all tectonic settings, we propose that earthquakes primarily occur along active f.ult segments characterized by relative minima of.strain rate, segments which are locked or slowly creeping. We discuss regional examples where large earthquakes happened in areas of.relative low strain rate. Regardless the tectonic style, the interseismic stress and strain pattern inverts during the coseismic stage. Where a dilated band f.rmed during the interseismic stage, this will be shortened at the coseismic stage, and vice-versa what was previously shortened, it will be dilated. The interseismic energy accumulation and the coseismic expenditure rather depend on the tectonic setting （extensional, contractional, or strike-slip）. The gravitational potential energy dominates along normal f.ults, whereas the elastic energy prevails f.r thrust earthquakes and perf.rms work against the gravity f.rce. The energy budget in strike-slip tectonic setting is also primarily due elastic energy. Theref.re, precursors may be dif.erent as a f.nction of.the tectonic setting. In this model, with a given displacement, the magnitude of.an earthquake results f.om the coseismic slip of.the def.rmed volume above the BDT rather than only on the f.ult length, and it also depends on the f.ult kinematics.

关键词： Earthquake generation mode Strain rate Brittle-ductile transition Earthquake energy

DAMAGE ANALYSIS BY BOUNDARY ELEMENT METHOD

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Acta Mechanica Solida Sinica 1994年第3期7卷 245-255页

作者： Z.Z.Cen G.Swoboda f.Ito Tsinghua University BeijingChina Innsbruck University InnsbruckAustria

The response of.cracked bodies subjected to loading was investigated by the boundary element method in this paper. The two-law elastic-cohesive-sof.ening model was used f.r crack propagation analysis. The interf.ce conditions f.r uncracked, craze, open crack, adhesive crack and slid crack parts were discussed and the corresponding incremental iteration algorithm was given. A simplif.ed damage propagation model was presented. The technique has been applied to some specif.c examples which give the evidence that the method is satisf.ctory and ef.icient.

关键词： Algorithms Boundary element method Crack propagation Cracks Dynamic response Elasticity f.acture mechanics Interf.ces (materials) Iterative methods Loads (f.rces) Mathematical models

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银河帝国的反击 1版

银河帝国的反击

Threshold photoelectron-photoion coincidence and its applica-tion to photoionization of.molecules using synchrotron radiation

1980年

作者：（美）乔治·卢卡斯原唐纳·f.格鲁特改写张若衡陈月泉译

来源：汇雅图书（南通市图书馆... 评论

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Chinese Science Bulletin 1997年第10期42卷 809-814页

作者： Gao, H Zhang, YW Sheng, LS Qi, f.Liu, YM National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei China

PHOTOIONIZATION method is one of.the powerf.l tools f.r the investigation of.the molecular en-ergetic,structure and dynamic *** process of.photoionization of.a given systeminvolves at least three particles:the absorbe... 详细信息

关键词： threshold photoelectron threshold photoelectron-photoion coincidence synchrotron radiation.