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PARTICLE SIZE DISTRIBUTION IN A PLANAR JET FLOW UNDER-GOING SHEAR-INDUCED COAGULATION AND BREAKAGE

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Journal of Hydrodynamics 2010年第4期22卷 445-455页

作者： GAN Fu-jun LIN Jian-zhong YU Ming-zhou State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China china Jiliang university Hangzhou 310018 China State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China china Jiliang university Hangzhou 310018 China

A CFD simulation is performed for a particle-laden planar jet *** Reynolds number is 8300,and the initial particle diameter is 1 μ*** Eddy Simulation（LES） is employed to calculate the flow field,and the Taylor-series expansion moment method（TEMOM） is adopted to deal with the balance equation of particle coagulation and *** shear-induced coagulation kernel,power-law breakage kernel and symmetric fragment distribution function are *** prediction of the distribution of the mean streamwise velocity of the jet is in good agreement with experimental *** evolution of particle number concentration,volume concentration,polydispersity,particle diameter and standard geometric deviation is discussed in *** results show that as the jet travels downstream,the particle number concentration and volume concentration decrease,while their spans become *** polydispersity and particle diameter are very large in the shear layers at the upstream and in the core of vortex structures at the *** particle standard geometric deviation changes within the range of 1.32 ≤σg≤ 1.96,and increases sharply in the shear *** variables approach the steady-state as time progresses.

关键词： Taylor-series expansion moment method shear-induced coagulation breakage planar jet

Online uniform machine covering with the known largest size

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Progress in Natural science:Materials International 2007年第11期17卷 1271-1278页

作者： Cao Shunjuan1,2 and Tan Zhiyi1,3(1. Department of Mathematics, zhejiang university, hangzhou 310027, china 2. Department of Mathematics, zhejiang Forestry university, hangzhou 311300, china 3. State Key Laboratory of CAD & CG, zhejiang university, hangzhou 310027, china) Department of Mathematics Zhejiang University Hangzhou 310027 China Department of Mathematics Zhejiang Forestry University Hangzhou 311300 China State Key Laboratory of CAD & CG Zhejiang University Hangzhou 310027 China

This paper investigates the semi-online scheduling problem with the known largest size on two uniform machines. The objective is to maximize the minimum machine completion time. Both lower bounds and algorithms are given. Algorithms are optimal for the majority values of s≥1, where s is the speed ratio of the two machines. The largest gap between the competitive ratio and the lower bound is about 0.064. Moreover, the overall competitive ratio 2 matches the overall lower bound.

关键词： scheduling and covering uniform machine design and analysis of algorithm online competitive ratio

Weighted composition operators between μ-Bloch spaces on the unit ball

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science china Mathematics 2005年第10期48卷 1349-1368页

作者： ZHANG Xuejun~1 & XIAO Jianbin~2 1. college of Mathematics and Computer science,Hunan Normal university,Changsha 410006,china(email:xuejunttt@263. net) 2. The School of science,hangzhou Dianzi university,hangzhou 310037,china 1. college of Mathematics and Computer science Hunan Normal University 410006 Changsha China 2. The School of science Hangzhou Dianzi University 310037 Hangzhou China

In this paper,necessary and sufficient conditions are given for the weighted composition operator T_(ψ,ψ) to be bounded or compact from the space β_μ to β_ν (or β_(μ,0) to β_(ν,0) ) on the unit ball of C^***... 详细信息

关键词： μ-Bloch space, weighted composition operator, boundedness, compactness.

Effects　of　alkaline　ameliorator　additions　on　the　acidic　buffering　abilities　of　aluminum－rich　alfisols

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Journal of Environmental sciences 1996年第2期8卷 235-241页

作者： Wu Jiemin Shao Feng(Department of Environmental science, zhejiang Agricultural university, hangzhou 310029 , china) Department of Environmental science Zhejiang Agricultural University Hangzhou 310029 China

Lime and coal flying ash applications could mitigate pollution from acid deposition and improve the buffering ability of two acidic soils sampled from zhejiang Province. The results showed that soil alkalinity and acidified buffering capacities (QpHs ) were significantly increased, especially for liming treatment; whereas, the amounts of SO24- adsorbed by treated soils were decreased to some degrees because net negative charges of soil oxide colloidal surfaces were increased with the decrease in soil acidity, although the soil fixation abilities for adsorbed SO24- were not reduced. These facts indicated that after the alkaline ameliorators were applied, the positive and adverse effects resulted from sulfate-type acid deposition were simultaneously existed in these soil treatments.

关键词： acidic alfisol alkaline ameliorator acidified buffering capacity.

On solving equations of algebraic sum of equal powers

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science china Mathematics 2006年第9期49卷 1153-1157页

作者： WANG Xinghua & YANG Shijun Department of Mathematics, zhejiang university, hangzhou 310028, china Department of Mathematics, hangzhou Normal college, hangzhou 310036, china Department of Mathematics Zhejiang University Hangzhou 310028 China Department of Mathematics Hangzhou Normal College Hangzhou 310036 China

It is well known that a system of equations of sum of equal powers can be converted to an algebraic equation of higher degree via Newton's identities. This is the Viete-Newton theorem. This work reports the generalizations of the Viete-Newton theorem to a system of equations of algebraic sum of equal powers. By exploiting some facts from algebra and combinatorics,it is shown that a system of equations of algebraic sum of equal powers can be converted in a closed form to two algebraic equations, whose degree sum equals the number of unknowns of the system of equations of algebraic sum of equal powers.

关键词： algebraic sum of equal powers, Newton's identities, system of equations,roots of a polynomial.

User-controllable mesh segmentation using shape harmonic signature

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Progress in Natural science:Materials International 2009年第4期19卷 471-478页

作者： Yongwei Miao a,b, Jieqing Fenga, Jinrong Wanga,c, Xiaogang Jin a a State Key Laboratory of CAD & CG, zhejiang university, hangzhou 310027, china b college of science, zhejiang university of technology, hangzhou 310032, china c Information science & Engineering School, hangzhou Normal university, hangzhou 310036, china [a]State Key Laboratory of CAD & CG Zhejiang University Hangzhou 310027 China [b]College of Science Zhejiang University of Technology Hangzhou 310032 China [c]Information Science & Engineering School Hangzhou Normal University Hangzhou 310036 China

Due to different shape modeling applications, partitioning a given complex 3D mesh model into some patches or meaningful subparts is one of the fundamental problems in digital geometry processing. By using the high-dimensional mean-shift clustering scheme in shape signature space, a new method is proposed which can generate user-specified segmentation results automatically for different applications. The shape signature is composed of mesh geometric attributes and its spectral harmonics. The latter one can reflect mesh frequency spectrum information. The low frequency components are essential for semantics-oriented segmentation, while the high frequency components are important for purely geometry-oriented segmentation. The effects of the proposed method are demonstrated by several examples.

关键词： Mesh segmentation Manifold harmonic analysis Shape harmonic signature Mean-shift clustering

Recombinant Functional Human Lactoferrin Expressed in Baculovirus System

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Acta Biochimica et Biophysica Sinica 2006年第3期38卷 201-206页

作者： Tao LIU~(1,2) Yao-Zhou ZHANG~2* Xiang-Fu WU~31 Institute of Biochemistry,college of life sciences,zhejiang university,hangzhou 310029,china 2 Institute of Biochemistry,zhejiang sci-Tec university,hangzhou 310018,china 3 Institute of Biochemistry and Cell Biology,Chinese Academy of sciences Shanghai 200031,china InstituteofBiochemistry CollegeofLifeSciencesZhejiangUniversityHangzhou310029China InstituteofBiochemistry ZhejiangSci-TecUniversityHangzhou310018China

Human lactoferrin (hLf) is a multifunctional iron-binding *** this study,weamplified hLfcDNA by reverse transcription-polymerase chain reaction from normal human mammary *** nucleotide sequence of the hLf was identical to the known *** constructed a recombinant virus,vBm-hLf,harboring the hLf gene and exploited the BmN cells as host to produce recombinant human lactoferrin(rhLf).It was found that a recombinant protein with a molecular mass of approximately 78 kDa was *** 13.5μg rhLf was purified from 1-2×10～5 BmN cells infected by vBm-hLf and the rhLfproved to be biologically *** method established in our study will pave the way for efficient productionof rhLf for further application of this protein in the future.

关键词： bacteriostatic activity baculovirus Bombyx mori human lactoferrin reverse transcriptionpolymerase chain reaction

Influence of Particle Size on Magnetic Properties of Soils in zhejiang Province, china

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Pedosphere 2000年第1期10卷 81-88页

作者： LU SHENGGAO (college of Environment and Resource, zhejiang university, hangzhou 510029 (china)) 浙江大学浙江杭州 310029

The relationship between magnetic properties and particle size of soils derived from metamorphic rock, basalt, granite, Quaternary red clay, limestone and mudstone from zhejiang Province, East china was studied. Based on the variations of the mass magnetic susceptibility (X), anhysteretic remanent magnetization (ARM), and saturation isothermal remanent magnetization (SIRM) with soil particle size, the relationship could be classified into three groups. For the soils derived from metamorphic rock and basalt, magnetic values were the highest in the gravel and coarse sand fractions and decreased with decreasing soil particle size. The soils derived from sedimentary rock had a bimodal distribution of magnetic values, with peaks in 1-0.5 and 0.005-0.000 5 mm fractions. The soil developed on granite was characterized by a peak of magnetic value in 0.001-0.000 5 mm fractions. Frequency-dependent susceptibility (Xfd ) and ratics of magnetic parameters (ARM/X, SIRM/X and SIRM/ARM) of soil particle fractions showed that variations in ferrimagnetic grain size paralleled those in particle size. Xfd peaked in clay fraction and decreased with increasing particle size, irrespective of soil parent materials. The acquisition curves of IRM and demagnetization parameter of different soil particles indicated that there were different magnetic minerals assemblages in different particle fractions.

关键词： soil particle soil parent material magnetic property zhejiang Province

MECHANISM OF DEUTERIUM CRACKING IN PALLADIUM

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Acta Metallurgica Sinica(English Letters) 1993年第2期6卷 136-139页

作者： SUN Dalin LEI Yongquan CHEN Yanglin WU Jing WANG Qidong zhejiang university,hangzhou,china Department of Materials science and Engineering,zhejiang university,hangzhou 310027,china zhejiang Univ Hangzhou China

After 290 h electrochemical charging of deuterium,the density of dislocation in well-annealed Pd was increased from 10~8/cm^2 to over 10~12/cm^2 and a large amount of bubble-like voids or cracks was observed by optical and transmission electron *** mechanism of deuterium cracking is believed due to the formation of molecular De during the segregstion and combination of deuterium atoms around *** results showed that the lattice constant of Pd increased from 0.3890 nm to 0.4034 nm.

关键词： deuterium cracking Pd