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A note on characterization of Hardy space H^1

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science china Mathematics 2005年第4期48卷 448-455页

作者： WANG Silei Department of Mathematics, zhejiang university, hangzhou 310028, china 1. Department of Mathematics Zhejiang University 310028 Hangzhou China

An all-round answer is given to the following question: 'Find a necessary and sufficient size condition for an integrable compactly supported function on Rn with mean value zero to be in the Hardy space H1.' Stefanov ... 详细信息

关键词： Hardy space Riesz transform Hilbert transform

A Heuristic for the Job Scheduling Problem with a Common Due Window on Parallel and Non-Identical Machines

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Journal of Systems Engineering and Electronics 2001年第2期12卷 6-11页

作者： Huang Decai college of information Engineering, zhejiang university of technology,hangzhou 310014, P. R. china college of Information Engineering Zhejiang University of Technology Hangzhou 310014 P. R. China

In this paper, we give a mathematical model for earliness-tardiness job scheduling problem with a common due window on parallel and non-identical machines. Because the job scheduling problem discussed in the paper contains a problem of minimizing make-span, which is NP-complete on parallel and uniform machines, a heuristic algorithm is presented to find an approximate solution for the scheduling problem after proving an important theorem. Two numerical examples illustrate that the heuristic algorithm is very useful and effective in obtaining the near-optimal solution.

关键词： Common due window Job scheduling Earliness-tardiness JIT.

Utilization of Coal Gangue and Copper Tailings as Clay for Cement Clinker Calcinations

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Journal of Wuhan university of technology(Materials science) 2011年第6期26卷 1205-1210页

作者：裘国华施正伦 State Key Lab of Clean Energy Utilization Zhejiang University college of Communication Engineering China Jiliang University

In order to avoid environmental pollution from Coal gangue （CG） and copper tailings （CT）, the utilization as cement clinker calcinations was experimentally investigated. Low-calcium limestone was also selected as another raw material. The clinker component and microstructure were analyzed by XRD and SEM. The experimental results showed that qualified cement clinker could be generated by substituting CG and CT compound for clay. While mixed with high-calcium limestone and low-calcium limestone, the calcinations temperature were 50 ℃ or 100 ℃ lower than that of clay. CT and CG contain oxygen-rich minerals and potential of geological rock energy. The energy of CG performs functions and drops down sintering temperature. The calcination time was shortened and the clinker sintering coal consumption reduced while substituting CG and CT for clay, and also served the reutilization of low-calcium limestone, CG and CT.

关键词： coal gangue copper tailings XRD oxygen-rich minerals

A NOVEL RESISTIVE HUMIDITY SENSOR BASED ON SODIUM POLYSTYRENESULFONATE/TiO_2 NANOCOMPOSITES

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Chinese Journal of Polymer science 2002年第3期20卷 237-241页

作者： Yang Li Mu-jie Yang Yong She Department of Polymer science and Engineering zhejiang university, hangzhou 310027 china zhejiang Univ Dept Polymer Sci & Engn Hangzhou 310027 Peoples R China

A resistive humidity sensor was prepared based on sodium polystyrenesulfonate (NaPSS)/TiO2 nanocomposites, and its electrical response to humidity was examined. The sensor exhibits better linearity, smaller hysteresis (2 s; desorption: less than 20 s) in comparison with sensor composed of NaPSS. The effect of concentration of NaPSS and TiO2 on humidity response of sensors was discussed.

关键词： humidity sensor nanocomposites TiO2 sodium polystyrenesulfonate

Hodograph computation and bound estimation for rational B-spline curves

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Progress in Natural science:Materials International 2007年第8期17卷 988-992页

作者： Xu Huixia~(1,2) Wang Guojin~(1,2**) (1.Institute of Computer Images and Graphics,zhejiang university,hangzhou 310027,china 2.State Key Laboratory of CAD&CG,zhejiang university,hangzhou 310027,china) [a]Institute of Computer Images and Graphics Zhejiang University Hangzhou China [b]State Key Laboratory of CAD&CG Zhejiang University Hangzhou China

It is necessary to compute the derivative end estimate the bound of rational B-spline curves in design system,which has not been studied to *** improve the function of computer aided design (CAD) system,end to enhance the efficiency of different algo- rithms of rational B-spline curves,the representation of scaled hodograph and bound of derivative magnitude of uniform planar rational B- spline curves are derived by applying Dir function,which indicates the direction of Cartesian vector between homogeneous points,discrete B-spline theory end the formula of translating the product into a summation of B-spline *** an application of the result above, upper bound of parametric distance between any two points in a uniform planar rational B-spline curve is further presented.

关键词： computer aided design (CAD) rational B-spline discrete B-spline hodograph bound of derivative distance between two points

HYDROGEN IN Pd-In ALLOYS

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Acta Metallurgica Sinica(English Letters) 1996年第5期9卷 367-372页

作者： Y.L. Chen(Department of Materials science and Engineering, zhejiang university, hangzhou 310027, china)

The equilibrium p-c-T data were determined by a microbalance in a vacuum system at hydrogen pressures up to 3.5 MPa on four Pd-In alloys between 3.64 and 14.53 at. % In as well as on Pure Pd. The results are similar to those obtained on the analogous alloys Pd-Ag and Pd-Sn and are interpreted in the same manner. In has two opposing effects upon the solubility of H in the Pd alloys, i.e., increase of the Fermi energy upon the donation of valence electrons and a lattice dilatation. At valence electron concentrations below 0.5, the lattice dilatation predominates and the H solubility is increased with addition of In. At valence electron concentrations above 0.5, the influence of the elevated Fermi energy predominates and the H solubility is lowered by addition of In. The molar enthalpy of Pd hydriding at infinite dilution is strongly increased with increasing In content, but the molar entropy is not nearly as much affected by the Presence of In. The excess chemical potential of hydrogen at small hydrogen concentrations and at a given temperature increases with an increase of In content. The apparent H-H attractive interaction energy, W H-H, is decreased by the presence of In. The trend is also similar to that found for the Pd-Ag-H and Pd-Sn-H system.

关键词： Pd-In alloy valence electron lattice dilatation Fermi energy

Limit theory of restricted range approximations of complex-valued continuous functions

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science china Mathematics 2007年第10期50卷 1427-1440页

作者： Xian-fa LUO~1 Chong LI~(2+) ~1 School of Mathematics and Computer science,Jishou university,Jishou 416000,china ~2 Department of Mathematics,zhejiang university,hangzhou 310027,china 1. School of Mathematics and Computer science Jishou University Jishou 416000 China 2. Department of Mathematics Zhejiang University Hangzhou 310027 China

This paper is concerned with the problem of the best restricted range approximations of complex-valued continuous functions. Several properties for the approximating set PΩ such that the classical characterization results and/or the uniqueness results of the best approximations hold are introduced. Under the very mild conditions, we prove that these properties are equivalent that P is a Haar subspce.

关键词： restricted range approximation, Haar subspace, characterization, uniqueness

Inverse minimum spanning tree problem and reverse shortest-path problem with discrete values

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Progress in Natural science:Materials International 2006年第6期16卷 649-655页

作者： LIU Longcheng and HE Yong (Department of Mathematics, zhejiang university, hangzhou 310027, china State Key Laboratory of CAD & CG, zhejiang university, hangzhou 310027, china) [a]Department of Mathematics Zhejiang University Hangzhou China [b]State Key Laboratory of CAD & CG Zhejiang University Hangzhou China

In this paper, we consider two network improvement problems with given discrete values: the inverse minimum spanning tree problem and the reverse shortest-path problem, where the decrements of the weight of the edges are given discrete values. First, for the three models of the inverse minimum spanning tree problem (the sum-type, the bottleneck-type and the constrained bottleneck-type), we present their respective strongly polynomial algorithms. Then, we show that the reverse shortest-path problem is strongly NP-complete.

关键词： minimum spanning tree shortest-path problem inverse problem reverse problem computational complexity.

Quantification of the effects of management factors on maize (Zea mays L.) and cotton(Gossypium hirsutum L.) residues decomposition rate

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Journal of Environmental sciences 2002年第2期14卷 165-172页

作者： JONES Chilima, HUANG Chang yong, WU Ci fang (college of Natural Resources and Environment, zhejiang university, hangzhou 310029, china. college of Natural Resources and Environment Zhejiang University Hangzhou 310029 China

Efforts to quantify management effects on decomposition rate of added substrates to the soil is important especially where such information is to be used for prediction in mathematical or simulation models. Using data from a short term (60 days) greenhouse simulation study, a procedure for quantifying effects of management on SOM and substrate decomposition is presented. Using microbial growth rate u (q), microbial efficiency in substrate utilization e (q), specific decomposition rates for added plant residues to two contrasting soils, red earth (Ferrasol) and black earth (Acrisol) were estimated. The treatments included straw addition + buried, (T1); straw addition + mineral N (T2); and straw addition + tillage, (T3). Sampling was done every 15 days. Straw decomposition rate was affected by external mineral N sources (Urea 46% N). Addition of an external N source significantly increased decomposition rates. The study could not, however, fully account for the effect of tillage on residues because of the limited effect of the tillage method due to the artificial barrier to mechanical interference supplied by the mesh bags. It is concluded that using few decomposer parameters, decomposition rates and consequently SOM trends in a soil system can be monitored and quantification of the influence of perturbations on decomposition rate of added substrates possible.

关键词： management factors residue decomposition rate maize cotton red soil black soil