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Study on the two and three-parameter working stability regions of 3.-TZP suspension

Science china(Technological Sciences) 2006年第5期49卷 547-568页

作者： CHEN Youqiang1, 2, ZHANG Xinni3. CHEN Sha’ou3.& QI Ping3.1. Department of Chemistry, qingdao university, qingdao 266071, {3. 2. Department of Chemistry, Tsinghua university, Beijing 100084, {3. 3. Department of Physics, qingdao university, qingdao 266071, {3. Department of Chemistry Qingdao University Qingdao China Department of Chemistry Tsinghua University Beijing China Department of Physics Qingdao University Qingdao China

We determined the variation tendency of viscosity (η) at various solids load- ing (α) for 3.-TZP suspension as a function of dispersant concentration (Cw) using vis- cosity measurement, measured the diameter of particles as a function of Cw in very dilute suspension using light scattering method, and obtained the surface features of the sedi- ment of suspension with different Cw using SEM. We also discussed the influence of the microstructure of adsorbed polymer layers on particles and their interactions in the dis- persing medium on the stability of suspension. Then two different stable states and two different unstable states for 3.-TZP suspension were given. Accordingly, the (Cw, η), (Cw, α), and (α, η) two-parameter, and (Cw, α, η) three-parameter stability maps were con- structed. Based on the DLVO theory calculations, the dispersant concentration, particle distance (r), and interparticle potential energy (VT) maps with various solids loading for 3.-TZP aqueous suspension were also constructed. In (Cw, r) two-parameter coordinate system, the stable motion region map for particles was established. The Cw, α, and VT,max (the highest potential energy) surface of the potential barrier map was obtained through calculation and simulation on the basis of the surfaces of Cw, r, VT maps introduced above. The (Cw, α) two-parameter stability map was then obtained from the Cw, α, VT,max map. The results showed that this theoretical map can qualitatively prove the experimentally obtained results—the existence of different dispersed states of particles in suspension system and the variation tendency of suspension stability with changing each parame- ter—were reasonable.

关键词： 3.-TZP, suspension, stability, DLVO theory, interparticle potential energy.

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ON RAYLEIGH QUOTIENT MATRICES: THEORY ANDAPPLICATIONS

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Journal of Computational Mathematics 1999年第6期17卷 629-638页

作者： Xin-guo Liu(Department of Applied Mathematics ocean university of qingdao,{3.) 青岛海洋大学应用数学系山东青岛 266003

Many authors have studied the Rayleigh quotient and Rayleigh quotient matrix. This paper consists of two parts. First, generalizations of some results on the Rayleigh quotient are proved. Second, we give some applicat... 详细信息

关键词： Rayleigh quotient matrix eigenvalue approximation

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A model study on carbon cycle and phytoplankton dynamical processes in the Bohai Sea

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Acta oceanologica Sinica 2003年第1期22卷 47-56页

作者： WeiHao ZhaoLiang FengShizuo InstituteofPhysicaloceanography OceanUniversityofChina(OceanUniversityofQingdao)Qingdao266003China PhysicaloceanographyKeyLabofStateEducationMinistry OceanUniversityofChina(OceanUnivrsityofQingdao)Qingdao266003China

The carbon cycle of lower trophic level in the Bohai Sea is studied with a three-dimensional biological and physical coupled model. The influences of the processes (including horizontal advection, river nutrient load, active transport etc. ) on the phytoplankton biomass and its evolution are estimated. The Bohai Sea is a weak sink of the CO2 in the atmosphere. During the cycle, 13.7% of the gross production of the phytoplankton enter the higher trophic level and 76.8 % of it are consumed by the respiration itself. The nutrient reproduction comes mainly from the internal biogeochemical loop and the rem-ineralization is an important mechanism of the nutrient transfer from organic form to inorganic. Horizontal advection decreases the total biomass and the eutrophication in some sea areas. Change in the nutrient load of a river can only adjust the local system near its estuary. Controlling the input of the nutrient, which limits the alga growth, can be very useful in lessening the phytoplankton biomass.

关键词： Carbon cycle phytoplankton dynamics the Bohai Sea

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Caspase Family Proteases and Apoptosis

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Acta Biochimica et Biophysica Sinica 2005年第11期37卷 719-727页

作者： Ting-Jun FAN Li-Hui HAN Ri-Shan CONG Jin LIANG College of Marine Life Sciences,Division of Life Science and Technology,ocean university of china,{3. 2.6003.china College of Chemistry & Chemical Engineering,ocean university of china,{3. 2.6003.china College of Marine Life Sciences Division of Life Science and Technology Ocean University of ChinaQingdao 266003 China College of Chemistry & Chemical Engineering Ocean University of ChinaQingdao 266003 China

Apoptosis,or programmed cell death,is an essential physiological process that plays a criticalrole in development and tissue *** progress of apoptosis is regulated in an orderly way by aseries of signal cascades under certain *** caspase-cascade system plays vital roles in theinduction,transduction and amplification of intracellular apoptotic ***,closely associated withapoptosis,are aspartate-specific cysteine proteases and members of the interleukin-1β-converting *** activation and function of caspases,involved in the delicate caspase-cascade system,are regu-lated by various kinds of molecules,such as the inhibitor of apoptosis protein,Bcl-2 family proteins,calpain,and Ca2+,Based on the latest research,the members of the caspase family,caspase-cascade system andcaspase-regulating molecules involved in apoptosis are reviewed.

关键词： caspase apoptosis interleukin-1β-converting enzyme family inhibitor of apoptosis protein Bcl-2 family

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Analysis on cohesive crack opening displacement considering the strain softening effect

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Science china(Physics,Mechanics & Astronomy) 2006年第1期49卷 88-101页

作者： WANG Limin1, XU Shilang2 & ZHAO Xiqiang3.1. Mechanics Department, Shandong university of Technology, Zibo 255049, china 2. Civil Engineering Department, Dalian university of Technology, Dalian 116024, china 3. Mathematics Department, ocean university of china, qingdao 266071, china Mechanics Department Shandong University of Technology Zibo China Civil Engineering Department Dalian University of Technology Dalian China Mathematics Department Ocean University of China Qingdao China

In order to investigate the crack propagation in quasi-brittle materials like rock, ceramic and concrete, Hillerborg and his co-researchers abstracted the fracture process zone in front of a stress free crack in terms of a “fictitious crack zone”. On the fictitious crack zone, cohesive stresses distribute following a given softening relationship of stress vs. crack opening. Based on the polynomial or power series expression of cohesive crack opening displacement, the relationship of the cohesive stress vs. the crack opening displacement is established using elastic theory and integral equation, and some unknown physics variables are obtained using variation approach. The calculation results gained in this paper are close to the experimentally test ones.

关键词： cohesive crack, softening, dissipation work, variation approach.

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The Statistical Distribution of the Horizontal Velocities of Water Particles at Wave Surface Maxima

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china ocean Engineering 1998年第3期13卷 359-364页

作者： GUAN Changlong Professor, Institute of Physical oceanography, ocean university of {3., qingdao 2.6003. china. Institute of Physical oceanography Ocean University of Qingdao Qingdao 266003 China

On the basis of the linear model of random sea waves presented by Longuet-Higgins, the statistical distribution of the horizontal velocities of water particles at wave surface maxima is derived theoretically. The derived distribution is similar to that of wave surface maxima, and a new spectral width epsilon(u), which is defined as (1 - m(3.(2)/m(2)m(4))(1/2), is introduced in the distribution. When epsilon(u) tends to zero, the distribution is reduced to Rayleigh distribution and it is reduced to the normal distribution when epsilon(u) tends to unity. For a narrow spectrum, it is proved that epsilon is equal to 1/2 epsilon, where epsilon is (1 - m(2)(2)/m(0)m(4))(1/2) and is the commonly used spectral width.

关键词： sea wave wave surface maxima horizontal velocity statistical distribution

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The advancement of oscillation theory of functional differential equations

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Chinese Science Bulletin 1998年第12期43卷 974-982页

作者： ZHANG Binggen Department of Applied Mathematics, ocean university of qingdao,{3. Department of Applied Mathematics Ocean University of Qingdao Qingdao China

The oscillation theory of functional differential equations (FDEs) is surveyed including (ⅰ) formulation of oscillation problems; (ⅱ) a brief history of the oscillation theory of FDEs; (ⅲ) main topics in the oscill... 详细信息

关键词： functional differential equations oscillation theory.

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Bubble size distribution in surface wave breaking entraining process

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Science china Earth Sciences 2007年第11期50卷 1754-1760页

作者： HAN Lei1,2 & YUAN YeLi2 1 Department of ocean Environment, ocean university of {3., qingdao 2.6003. china 2 The First Institute of oceanography, State ocean Administration, qingdao 266061, {3. Department of ocean Environment Ocean University of China Qingdao China The First Institute of oceanography State Ocean Administration Qingdao China

From the similarity theorem, an expression of bubble population is derived as a function of the air en-trainment rate, the turbulent kinetic energy (TKE) spectrum density and the surface tension. The bubble size spectrum that we obtain has a dependence of a?2.5+nd on the bubble radius, in which nd is positive and dependent on the form of TKE spectrum within the viscous dissipation range. To relate the bubble population with wave parameters, an expression about the air entrainment rate is deduced by intro-ducing two statistical relations to wave breaking. The bubble population vertical distribution is also derived, based on two assumptions from two typical observation results.

关键词： wave breaking,bubble cloud,bubble size spectrum

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NUMERICAL SIMULATION OF SEA SURFACE DIRECTIONAL WAVE SPECTRA UNDER TYPHOON WIND FORCING

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Journal of Hydrodynamics 2008年第6期20卷 776-783页

作者： ZHOU Liang-ming WANG Ai-fang GUO Pei-fang Physical oceanography Laboratory Ocean University of China Qingdao 266100 China Engineering Reconnaissance and Design Institute Ocean University of China Qingdao 266071 China

Numercial simulation of sea surface directional wave spectra under typhoon wind forcing in the South china Sea （SCS） was carreid out using the WAVEWATCH-Ⅲ wave model. The simulation was run for 210 h until the Typhoon Damrey （2005） approached Vietnam. The simulated data were compared with buoy observations, which were obtained in the northwest sea area of Hainan Island. The results show that the significant wave height, wave direction, wave length and frequency spetra agree well with buoy observations. The spatial characteristics of the signifciant wave height, mean wave period, mean wave length, wave age and directional spectra depend on the relative position from the typhoon center. Also, the misalignment between local wind and wave directions were investigated.

关键词： typhoon directional spectra significant wave height South china Sea (SCS)

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Ancient Changjiang channel system in the East china Sea continental shelf during the last glaciation

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Science china Earth Sciences 2005年第11期48卷 1972-1978页

作者： LI Guangxue1,2, LIU Yong1, YANG Zigeng3. YUE Shuhong4, YANG Wenda5 & HAN Xibin1 1. College of Marine Geo-science, ocean university of china,{3. 2. Shandong Key Laboratory of Sea Floor Resource and Exploration Technique,{3. 3. qingdao Institute of Marine Geology, qingdao 266071, china 4. College of Marine Environment, ocean university of china,{3. 5. First Survey Team of Marine Geology, Shanghai Bureau of Petroleum, Shanghai 201208, china College of Marine Geo-science Ocean University of China Qingdao China Shandong Key Laboratory of Sea Floor Resource and Exploration Technique Qingdao China qingdao Institute of Marine Geology Qingdao China College of Marine Environment Ocean University of China Qingdao China First Survey Team of Marine Geology Shanghai Bureau of Petroleum Shanghai China

Based on the data of high-resolution seismic profiles, an ancient river channel sys-tem of the last glaciation occurred along the Zhedong and Xihu depression in the southeast of Hupijiao rise. The distribution of the channel fill system shows that the ancient Changjiang River went through the Changjiang depression into the low land plain of the outside continental shelf during the low sea level cycle of the last glaciation. The big channel fill into Okinawa Trough is not found due to the depletion of the river kinetic energy in the low land plain. The river discharge dispersal was of an important role to the dilution of the northern Okinawa Trough sea at that time. Six ancient river channel systems (A―F), which are main distributaries of ancient Changjiang in the East china Sea continental shelf during the last glaciation, may be buried off the modern Changjiang estuary. The distribution of these channels coincides with the zonal elevations in the sea floor.

关键词： last glaciation, continental shelf plain, Changjiang River, ancient channel fill

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