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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, China 2. department of Chemistry, Tsinghua university, Beijing 100084, China 3. department of physics, qingdao university, qingdao 266071, China department of physics Qingdao University

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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Accurate studies on the full vibrational energy spectra and molecular dissociation energies for some electronic states of N_(2)molecule

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Science China(physics,Mechanics & Astronomy) 2005年第4期48卷 385-398页

作者： REN Weiyi1,2, SUN Weiguo1, HOU Shilin3.& FENG Hao4 1. Institute of physics, College of Chemical Engineering, Sichuan university, Chengdu 610065, China 2. Institute of Theoretical physics, Xihua Normal university, Nanchong 63.002, China 3. department of physics, China oceanography university, qingdao 266003. China 4. College of physics, Sichuan university, Chengdu 610065, China Institute of physics College of Chemical Engineering Sichuan University Chengdu China Institute of Theoretical physics Xihua Normal University Nanchong China department of physics China Oceanography University Qingdao China College of physics Sichuan University Chengdu China

It is usually very difficult to directly obtain molecular dissociation energy De and all accurate high-lying vibrational energies for most diatomic electronic states using modern experimental techniques or quantum theories, and it is also very difficult to give accurate analytical expression for diatomic molecular dissociation energy. This study proposes a new analytical formula for obtaining accurate molecular dissociation energy based on the LeRoy and Bernstein’s energy expression in dissociation limit. A set of full vibrational energy spectra for some electronic states of N2 molecule are studied using the algebraic method (AM) suggested recently, and the corresponding accurate molecular dissociation energies are evaluated using the proposed new formula and high-lying AM vibrational energies. The results show that the AM spectra and the new theoretical dissociation energies agree excellently with experimental data, and thereby providing a new physical approach to generating accurate dissociation energies for electronic states of diatomic molecules.

关键词： vibrational energy, dissociation energy, nitrogen molecule, algebraic method.

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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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Virtualities of quark and gluon in QCD vacuum

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Science China(physics,Mechanics & Astronomy) 2008年第10期51卷 1439-1447页

作者： ZHOU LiJuan1, QIN SongMei2, WU Qing3.& MA WeiXing4 1 Collaboration Group of Hadron physics and Non-perturbative QCD Study, Guangxi university of Tech- nology, Liuzhou 545006, China 2 department of physics, Guangxi university, Nanning 540003. China 3.department of physics, qingdao university, qingdao 266071, China 4 Institute of High Energy physics, Chinese Academy of Sciences, Beijing 100049, China Collaboration Group of Hadron physics and Non-perturbative QCD Study Guangxi University of Technology Liuzhou China department of physics Guangxi University Nanning China department of physics Qingdao University Qingdao China Institute of High Energy physics Chinese Academy of Sciences Beijing China

The non-local vacuum condensates of quantum chromodynamics (QCD) describe the distributions of quarks and gluons in the non-perturbative QCD vacuum state. Physically, this means that vacuum quarks and gluons have a nonzero mean-squared momentum in the vacuum, called virtuality. The quark virtuality is given by the ratio of the local quark-gluon mixed vacuum condensate to the quark local vacuum condensate. The gluon virtuality is expressed by gluon vacuum condensates and four-quark vacuum condensates. We study the two virtualities by solving Dyson-Schwinger Equations and calculating quark and gluon vacuum condensates. Our theoretical results for quark virtuality are in good agreement with many other theoretical model predictions such as QCD sum rules and lattice QCD calculations. Our calculation on gluon virtuality is initial and the results are quite interesting.

关键词： quark gluon virtuality QCD vacuum condensate non-perturbative QCD

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Environmental impact of electromagnetic radiation from the 10kWmedium wave transmitter of Weihai Broadcasting Station

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Journal of Environmental Sciences 1995年第4期7卷 461-467页

作者： Wen Congjiang Lu Deming Wang Shuquan,Wang Baosheng Hu Baoge(department of physics , Ocean university of {3., {3. 266003., China)

Ｅｎｖｉｒｏｎｍｅｎｔａｌｉｍｐａｃｔｏｆｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｒａｄｉａｔｉｏｎｆｒｏｍｔｈｅ１０ｋＷｍｅｄｉｕｍｗａｖｅｔｒａｎｓｍｉｔｔｅｒｏｆＷｅｉｈａｉＢｒｏａｄｃａｓｔｉｎｇＳｔａｔｉｏｎＷｅｎＣ... 详细信息

Ｅｎｖｉｒｏｎｍｅｎｔａｌｉｍｐａｃｔｏｆｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｒａｄｉａｔｉｏｎｆｒｏｍｔｈｅ１０ｋＷｍｅｄｉｕｍｗａｖｅｔｒａｎｓｍｉｔｔｅｒｏｆＷｅｉｈａｉＢｒｏａｄｃａｓｔｉｎｇＳｔａｔｉｏｎＷｅｎＣｏｎｇｊｉａｎｇ；ＬｕＤｅｍｉｎｇ...

关键词： environmental impact assessment electromagnetic radiation broadcasting station electromagneticpollution.

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Symmetries and exact solutions of discrete nonconservative systems

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Science China(physics,Mechanics & Astronomy) 2010年第9期53卷 1699-1706页

作者： FU JingLi1,LI XiaoWei2,LI ChaoRong1,ZHAO WeiJia3.& CHEN BenYong4 1 Institute of Mathematical physics,Zhejiang Sci-Tech university,Hangzhou 3.0018,China 2 department of physics,Shangqiu Normal university,Shangqiu 476000,China 3.department of Mathematics,qingdao university,qingdao 266071,China 4 Faculty of Mechanical Engineering & Automation,Zhejiang Sci-Tech university,Hangzhou 3.0018,China Zhejiang Sci-Tech university Institute of Mathematical Physics Hangzhou China (GRID:grid.413273.0) (ISNI:***) Shangqiu Normal university Department of Physics Shangqiu China (GRID:grid.412544.2) (ISNI:***) qingdao university Department of Mathematics Qingdao China (GRID:grid.410645.2) (ISNI:***) Zhejiang Sci-Tech university Faculty of Mechanical Engineering &amp Automation Hangzhou China (GRID:grid.413273.0) (ISNI:***)

Based on the property of the discrete model entirely inheriting the symmetry of the continuous system,we present a method to construct exact solutions with continuous groups of transformations in discrete nonconservative *** Noether's identity of the discrete nonconservative system is *** symmetric discrete Lagrangian and symmetric discrete nonconservative forces are defined for the *** quasi-extremal equations of discrete nonconservative systems are *** conserved quantities are derived with symmetries associated with the continuous *** have also found that the existence of the one-parameter symmetry group provides a reduction to a conserved quantity;but the existence of a two-parameter symmetry group makes it possible to obtain an exact solution for a discrete nonconservative *** examples are discussed to illustrate these results.

关键词： discrete nonconservative system symmetry conserved quantity quasi-extremal equation exact solution

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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 China, qingdao {3. China 2 The First Institute of oceanography, State Ocean Administration, qingdao 266061, China 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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Structure of a pair of anticyclonic vortices in northern part of the South China Sea in autumn of 1994

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Acta Oceanologica Sinica 2002年第2期21卷 203-216页

作者： Fu Gang, Toshio Yamagata1. department of Marine Meteorology, Ocean university of qingdao, qingdao 266003. China2. department of Earth and Planetary physics, university of Tokyo, Japan department of Marine Meteorology Ocean University of Qingdao Qingdao 266003 China department of Earth and Planetary physics University of Tokyo Japan

A pair of remarkable meso-scale anticyclonic vortices, one formed closely to another, inthe northern part of the South China Sea during the period from the later August to early September of 1994 were documented by the in situ observation data. Their spatial structures were examined in detail from the horizontal and two nearly perpendicular/vertical angles of view. It was shown that the horizontal scales of these two vortices were around 100, 50 km, and their vertical scales were about 500, 1000 m, respectively. Two 'warm core' structures associated with these two vortices were found in their horizontal and vertical analyses. The closer spacing of these two vortices (namely, 60 km), which was smaller than the Rossby radius of deformation, suggested that they might merge with each other during their next evolution stages and form into a larger vortex eventually.

关键词： The South China Sea a pair of anticyclonic vortices warm core Rossby radius of deforma-tion

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Orthogonal design for optimization of pigment extraction from surface sediments of the Changjiang River Estuary

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Acta Oceanologica Sinica 2011年第4期30卷 33-42页

作者： ZHAO Jun YAO Peng YU Zhigang Thomas S Bianchi Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China Qingdao 266100 China department of oceanography Texas A ＆ M University College Station TX 77843 USA Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao 266100 China Institute of Marine Organic Geochemistry College of Chemistry and Chemical Engineering Ocean University of China Qingdao 266100 China

Using a suitable solvent for extracting pigments from sediment for high performance liquid chromatography（HPLC） analysis is critical for obtaining qualitative and quantitative estimates of phytoplanktonic and benthic algal biomass,as well as community composition. Five methodological factors（sample dehydration,extraction solvent,extraction duration,number of extractions,and ratio of solvent volume：sample weight） were studied using an L 9（3.4 ） orthogonal design in a sedimentary pigment extraction experiment on samples collected from the Changjiang large-river delta-front estuary（LDE）,using HPLC analysis. The results show that the optimal extraction method for sedimentary pigments should include freeze-drying samples prior to extraction. The effects of different factors on sedimentary pigment extraction were separated by the L 9（3.4 ） orthogonal design experiments and showed that the extraction solvent was the most important,with extraction duration the second most important,and numbers of extraction and ratio of solvent volume：sample weight was the least important. The mixed solvent treatment comprised of acetone,methanol and water（80：15：5,by volume） was best for polar pigment extraction,with 100% acetone better for apolar pigments. For most pigments employed in this study（i.e.,peridinin,fucoxanthin,alloxanthin,diatoxanthin,zeaxanthin,pheophytin-a and β-carotene） ,3.h was found to be enough time for extraction from these deltaic sediments. However,for chlorophyll-a,the most important pigment used for estimating algal biomass,12 h was needed. A small amount of solvent（3.ml） with duplicate extractions obtained the greatest amount and diversity of pigments. Unfortunately,no extraction method was found to be suitable for all pigments in sediments. The choice of extraction procedure should be made in accordance with the objective of each study,taking into consideration the properties of sediments and pigments in question.

关键词： sedimentary pigments extraction orthogonal design HPLC Changjiang River Estuary

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受激布里渊散射中的相位跃变

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中国激光 2001年第8期28卷 732-734页

作者：杨爱玲杨经国丁磊李明中张小民满永在青岛海洋大学物理系青岛266003 四川大学物理系成都610064 中国工程物理研究院核物理与化学研究所成都610003

报道了受激布里渊散射 (SBS)过程中的相位跃变 ,实测了相位跃变的几率随入射脉冲能量的关系。结果表明 ,在CCl4 介质中 ,相位跃变的几率约为 2 0 %。即使在饱和能量下 ,SBS的相位跃变依然存在。相位跃变干扰了Stokes光的相位 ,减小了相... 详细信息

报道了受激布里渊散射 (SBS)过程中的相位跃变 ,实测了相位跃变的几率随入射脉冲能量的关系。结果表明 ,在CCl4 介质中 ,相位跃变的几率约为 2 0 %。即使在饱和能量下 ,SBS的相位跃变依然存在。相位跃变干扰了Stokes光的相位 ,减小了相干长度 ,增加了光谱宽度。相位跃变的产生中断了SBS的相位共轭过程 ,造成SBS的相位共轭度下降。

关键词：受激布里渊散射相位共轭度相位跃变

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