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Biological exposure models for oil spill impact analysis

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Journal of Environmental Sciences 2000年第4期12卷 482-485页

作者： XIONG De qi 1, Mark Reed 2, Narve Ekrol 2 (1. Department of Marine Environmental Engineering, dalian maritime university, dalian 116026, china E mail: deqi@*** 2. Department of Environmental Engineering, SINTEF Applied Chemistry Institut 大连海事大学辽宁大连 1 1 6 0 2 SINTEF Applied Chemistry Institute 挪威 Trondheim 70 3 4

The oil spill impact analysis (OSIA) software system has been developed to supply a tool for comprehensive, quantitative environmental impact assessments resulting from oil spills. In the system, a biological component evaluates potential effects on exposed organisms based on results from a physico chemical fates component, including the extent and characteristics of the surface slick, and dissolved and total concentrations of hydrocarbons in the water column. The component includes a particle based exposure model for migratory adult fish populations, a particle based exposure model for spawning planktonic organisms (eggs and larvae), and an exposure model for wildlife species (sea birds or marine mammals). The exposure model for migratory adult fish populations simulates the migration behaviors of fish populations migrating to or staying in their feeding areas, over wintering areas or spawning areas, and determines the acute effects (mortality) and chronic accumulation (body burdens) from the dissolved contaminant. The exposure model for spawning planktonic organisms simulates the release of eggs and larvae, also as particles, from specific spawning areas during the spawning period, and determines their potential exposure to contaminants in the water or sediment. The exposure model for wild species calculates the exposure to surface oil of wildlife (bird and marine mammal) categories inhabiting the contaminated area. Compared with the earlier models in which all kinds of organisms are assumed evenly and randomly distributed, the updated biological exposure models can more realistically estimate potential effects on marine ecological system from oil spill pollution events.

关键词： oil spill biological exposure acute effects chronic accumulation migration of fish spawning of eggs and larvae habitat

Fractal Characteristic of Pits Distribution on 304 Stainless Steel Corroded Surface and Its Application in Corrosion Diagnosis

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Journal of Wuhan university of Technology(Materials Science) 2007年第3期22卷 389-393页

作者：梁成浩 Electromechanics & Materials Engineering College Dalian Maritime University

Electrochemical techniques and fractal theory were employed to study the corrosion behaviors and pits distribution characteristics on the corroded surfaces of 304 stainless steel exposed in FeCl3 solution. Fractal features of pits distribution over the corroded surfaces were observed and described by the fractal dimension. A 5-8-2 back-propagation （BP） artificial neural network model for the diagnoses of the pitting corrosion rate and pits deepness of 304 stainless steel under various conditions was developed by considering the fractal dimension as a key parameter for describing the pitting corrosion characteristics. The predicted results are well in agreement with the experimental data of pitting corrosion rate and pit deepness. The max relative errors between their experimental and simulation data are 6.69% and 4.62%, respectively.

关键词： 304 stainless steel pits distribution fractal neural network diagnosis

Reflection of regular and irregular waves from a partially perforated caisson breakwater with a rock-filled core

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Acta Oceanologica Sinica 2007年第3期26卷 129-141页

作者： LIU Yong1, LI Yucheng 1, 2, TENG Bin1, MA Baolian3 1.State Key Laboratory of Coastal and Offshore Engineering, dalian university of Technology, dalian 116024, china 2.R&D Center for Civil Engineering Technology, dalian university, dalian 116622, china 3.Tianjin maritime Safety Administration, Tianjin 300456, china dalian university of Technology State Key Laboratory of Coastal and Offshore Engineering Dalian 116024 Tianjin maritime Safety Administration Tianjin 300456

The reflection of regular and irregular waves from a partially perforated caisson breakwater with a rock-filled core is examined. The present mathematical model is developed by means of the matched eigenfunction method. Numerical results of the present model are compared with the experimental data of different researchers. Numerical examples are given to examine the effect of rock fill on the reflection coefficient. The differences between regular and irregular waves are also investigated by means of theoretical and experimental results. It is found that the minimum reflection coefficient of irregular waves is larger than that of corresponding regular waves, but the contrary is the case for the maximum reflection coefficient.

关键词： reflection coefficient regular waves irregular waves partially perforated caisson rock fill

The Mechanism Analysis of IGBT Module Invalidation

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The Mechanism Analysis of IGBT Module Invalidation

Enhancing aerodynamic performances of a high-turning compressor cascade via boundary layer suction

CES/IEEE 5th International Power Electronics and Motion Control Conference

作者： Xu Aide Fan Yinhai Wang Xinxin and Liu Yuanyuan dalian maritime university dalian china dalian maritime university Dalian China

ISBN: (纸本)1424404487;9781424404483

＜正＞The main purpose of this paper is to make a brief introduction of the applicable scope and the testing condition of IGBT module, to analyze the various reason causing IGBT module to be invalid which mainly involves drive part trouble, excessive heat, mechanical hurts, over voltage, over current and inductance that exists in the leads of circuit, and to make a general summary of the cautions which should be paid much attention to preventing IGBT module from being invalidated.

关键词： Insulated Gate Bipolar Transistor module invalidation gate drive voltage excessive heat mechanical hurts over voltage over current inductance exists in the leads of circuit

来源： cnki会议评论

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Science china(Technological Sciences) 2010年第10期53卷 2748-2755页

作者： GUO Shuang1, CHEN ShaoWen1, LU HuaWei2, SONG YanPing1 & CHEN Fu1 1 School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, china 2 Marine Engineering College, dalian maritime university, dalian 116026, china School of Energy Science and Engineering Harbin Institute of Technology Harbin China Marine Engineering College Dalian Maritime University Dalian China

Experimental investigation was carried out to study the effect of suction positions and suction flow rates on the aerodynamic performance of a compressor cascade with a large camber angle. The ink-trace flow visualization was conducted and the flow fields of the cascade were also measured. Three types of boundary layer suction configurations are compared,i.e. the suction surface suction,the endwall suction and the compound suction. Experimental results show that the large amount of suction flow rate gains more losses reduction than the small amount for a certain proper suction configuration,but the speed of loss decline slows down as the suction flow rate goes on increasing. Boundary layer suction on the suction surface obviously enhances the ability of the boundary layer around the midspan to withstand the negative pressure gradient of the flow passage. The range of the suction surface corner is also decreased. If the suction slot locates in the corner separation region where severe separation has happened,the flow separation will be terminated at the slot and redevelop downstream. And boundary layer suction on the endwall mainly influences the endwall corner region in remarkably delaying,lessening and reorganizing the corner separation. While the whole flow field is remarkably improved at both midspan and the corner region in the compound suction schemes. At higher suction flow rates,the aerodynamic performance of the compressor cascade is better than that with boundary layer suction simply on the suction surface or on the endwall. When the suction flow rate is 1.5% of the inlet mass flow,the compound suction scheme achieves a maximum loss reduction of 17% compared with the cascade without boundary layer suction.

关键词： boundary layer suction high-turning diffusion cascade suction flow rate suction position experimental investigation

Study on the Diffraction Patterns of α"-Fe_(16)N_2 with Jack-1 and Jack-2 Structural Parameters

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Journal of Materials Science & Technology 2000年第4期16卷 362-366页

作者： Zhiquan LIU and Douxing LI (Laboratory of Atomic Imaging of Solids, Institute of Metal Research, CAS, Shenyang 110015, china) Xiaolei XU, Liang WANG and Zukun HEI (Institute of Materials and Technology, dalian maritime university, dalian 116026, china) Laboratory of Atomic Imaging of Solids Institute of Metal Research CAS Shenyang 110015 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China

Two body centered tetragonal (bet) crystal structures of α'-Fe_(16)N_2 with x=0.25, z=0.3125 (Jack-1) and x=0.222, z=0.306 (Jack-2) respectively, were analyzed theoretically with EMS software package. The simulation of diffraction patterns indicates that both diffraction patterns of the same axis in these two structures obey bcc extinction rule. The conclusion is also obtained from the analyses of the diffracted waves. α'-Fe_(16)N_2 precipitates in the diffusion layer of ion-nitrided α-iron have been studied with transmission electron microscope (TEM). We have distinctly observed the electron diffraction patterns of α'-Fe_(16)N_2 in [100], [111], [110], [011], [210], [021], [311], [113], [331] and [133] zone axes with perfect symmetry, which indicate the parallel orientation relationship with α matrix:α'//α'// {100}.α'// {100}ｔα. The analyses of diffraction patterns, which obey bcc extinction rule, verify the bct structure of α'-Fe_(16)N_2 discovered by X-ray diffraction.

关键词： Study on the Diffraction Patterns of Jack N2 with Jack-1 and Jack-2 Structural Parameters Fe

Surface stability and conductivity of a high Cr and Ni austenitic stainless steel plates for PEMFC

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Rare Metals 2006年第Z1期25卷 229-234页

作者： TIAN Rujin SUN Juncai WANG Jianli Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China

In order to use stainless steel as bipolar plate for PEMFC, electrochemical behavior of a high Cr and Ni austenitic stainless steel was studied in the solutions containing different concentration of H2SO4 and 2 mg·L-1 F-, and interfacial contact resistance was measured after corrosion tests. The experimental results show that the passive current density lowers with decreasing the concentration of H2SO4. The interfacial contact resistance between carbon paper and passive film formed in the simulated PEMFC environment is higher than the goal of bipolar plate for PEMFC. Surface conductivity should be further reduced by surface modification.

关键词： austenitic stainless steel bipolar plate passive film interfacial contact resistance

DIFFERENTIAL SCANNING CALORIMETRY AND X-RAY DIFFRACTION STUDIES ON AGING BEHAVIOR OF Zn-Al ALLOYS

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Acta Metallurgica Sinica(English Letters) 2001年第2期14卷 109-114页

作者： X.L. Xu, Z. W. Yu, S.J. Ji, J.C. Sun and Z.K. Hei (dalian maritime university, dalian 116024, china) dalian maritime Univ. Dalian 116024 China

Decomposition processes of the quenched Zn-Al alloys were studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the stabilities of supersaturated solid solution (SSS) of Zn-Al alloy and α' phase formed by quenching would reduce with the increase of Zn content and the precipitation of η-Zn phases even when aging at ambient temperature, so that the exothermic precipitation peak in DSC curve would disappear. The activation energy of the η-Zn precipitation and the reaction enthalpy were calculated and measured. The kinetics of α' decomposition or η-Zn formation was determined by XRD. The microstructure change during aging was observed by TEM.

关键词： Aging of materials Aluminum alloys Differential scanning calorimetry X ray diffraction

Local connectivity of Julia sets for a family of biquadratic polynomials

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Science china Mathematics 2007年第10期50卷 1477-1492页

作者： Jing L~(1+) Wei-yuan QIU~2 ~1 Department of Basic Education,Shanghai maritime university,Shanghai 200000,china ~2 Department of Mathematics,Fudan university,Shanghai 200433,china Department of Basic Education Shanghai Maritime University Shanghai China Department of Mathematics Fudan University Shanghai China

The local connectivity of Julia sets for the family of biquadratic polynomials f_c(z)= (z^2-2c^2)z^2 with a parameter c is *** is proved that for any parameter c,the boundary of the immediately attracting domain of f_... 详细信息

关键词： biquadratic polynomials Julia sets local connectivity