检索结果-南通市图书馆

Bio-regeneration of p-complexation desulfurization adsorbents

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2005年第6期48卷 538-544页

作者： LI Wangliang1,2. XING Jianmin1, XIoNG Xiaochao1,2. SHAN Guobin1,2.& LIU Huizhou1 1. Laboratory of Separation Science and engineering, Institute of process engineering, Chinese {2. of Sciences, beijing 100080, china 2. graduate school of the Chinese {2. of Sciences,beijing 100039, china 1. Laboratory of Separation Science and engineering Institute of Process Engineering Chinese Academy of Sciences 100080 Beijing China 2. graduate school of the Chinese {2. of Sciences 100039 Beijing China

The coupling of adsorption desulfurization and biodesulfurization is a new approach to produce clean fuels. Sulfur compounds are firstly adsorbed on adsorbents, and then the ad-sorbents are regenerated by microbial conversion. p-Complexation adsorbent, Cu(I)-Y, was ob-tained by ion exchanging Y-type zeolite with Cu2. and then by auto-reduction in helium at 450℃ for 3 h. Dibenzothiophene (DBT) was used as a model compound. The effects of cell concentra-tion, volume of oil phase, the ratio of aqueous phase to adsorbent on DBT desorption by a bac-terium were studied. The amounts of DBT desorbed and 2.HBp produced can be apparently increased with addition of n-octane. BDS activity can be improved by increasing cell concentra-tion and the ratio of water-to-adsorbent. 89% of DBT desorbed from the adsorbents can be converted to 2.HBp within 6 h and almost 100% within 2. h, when the volume ratio of oil-to-water was 1/5 mL/mL, the cell concentration was 60 g·L?1, and the ratio of adsorbent-to-oil was 0.03 g·mL?1. The amount of 2.HBp produced was strongly dependent on the volume ratio of oil-to- water, cell concentration and amount of adsorbent. Adsorption capacity of the regenerated ad-sorbent is 95% that of the fresh one after being desorbed with pseudomonas delafieldii R-8, washed with n-octane, dried at 100℃ for 2. h and auto-reduced in He.

关键词： adsorption desulfurization p-complexation adsorbents bio-regeneration pseudomonas delafieldii desorption.

The Global Existence of one Type of Nonlinear Kirchhoff String Equation

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2003年第3期19卷 477-484页

作者： Xiao-yi Zhangbeijing graduate {2. of china academy of engineering physics, beijing 100088, china beijing graduate {2. of china Academy of Engineering Physics Beijing 100088 China

In this paper, the global well-posedness of initial-boundary value problem to the nonlinear Kirchhoff equation with source and damping term is established by energy method.

关键词： Kirchhoff equation global well-posedness

Algebraically explicit analytical solu-tions for the unsteady non-Newtonian swirling flow in an annular pipe

在线全文

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2006年第4期49卷 396-400页

作者： CAI Ruixian1 & GoU Chenhua1,2.1. Institute of engineering Thermophysics, Chinese academy of Sciences, {2. 100080, china 2. graduate school, Chinese academy of Sciences, {2. 100080, china 1. Institute of engineering Thermophysics Chinese Academy of Sciences Beijing 100080 China 2. graduate school Chinese Academy of Sciences Beijing 100080 China

This paper presents two algebraically explicit analytical solutions for the incompressible unsteady rotational flow of oldroyd-B type in an annular pipe. The first solution is derived with the common method of separation of variables. The second one is deduced with the method of separation of variables with addition developed in recent years. The first analytical solution is of clear physical meaning and both of them are fairly simple and valuable for the newly developing computational fluid dynamics. They can be used as the benchmark solutions to verify the applicability of the existing numerical computational methods and to inspire new differencing schemes, grid generation ways, etc. Moreover, a steady solution for the generalized second grade rheologic fluid flow is also presented. The correctness of these solutions can be easily proven by substituting them into the original governing equation.

关键词： analytical solution, oldroyd-B type fluid, swirling flow, non-Newtonian.

Explicit analytical solutions of the anisotropic Brinkman model for the natural convection in porous media(Ⅱ)

在线全文

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2005年第4期48卷 422-430页

作者： CAI Ruixian1, GoU Chenhua1, 2.& ZHANG Na1 1. Institute of engineering Thermophysics, Chinese academy of Sciences, {2. 100080, china 2. graduate school, Chinese academy of Sciences, {2. 100080, china 1. Institute of engineering Thermophysics Chinese Academy of Sciences 100080 Beijing China 2. graduate school Chinese Academy of Sciences 10080 Beijing China

Some algebraically explicit analytical solutions are derived for the anisotropic Brinkman model―an improved Darcy model―describing the natural convection in porous media. Besides their important theoretical meaning (for example, in analyzing the non-Darcy and anisotropic effects on the convection), such analytical solutions can be the benchmark solutions that can promote the development of computational heat and mass transfer. Some solutions considering the anisotropic effect of permeability have been given previously by the authors, and this paper gives solutions including the anisotropic effect of thermal conductivity and the effect of heat sources.

关键词： explicit analytical solution, porous medium, natural convection, Brinkman model, anisotropic.

Structures and physical properties of rigid polyurethane foams with water as the sole blowing agent

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2006年第4期49卷 363-370页

作者： LI Xiaobin1,2. CAo Hongbin1 & ZHANG Yi1 1. Institute of process engineering, Chinese academy of Sciences, {2. 100080, china 2. graduate school of the Chinese academy of Sciences, {2. 100039, china 1. Institute of process engineering Chinese Academy of Sciences Beijing 100080 China 2. graduate school of the Chinese {2. of Sciences Beijing 100039 China

Rigid polyurethane foams blown by varying water level were prepared in this study. The structures and physical properties of rigid polyurethane foams blown by water were measured with FT-IR, universal testing machine (Instron3365), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The results show that polyurea and polybiuret were the typical charac- teristics, and the cream time and gel time were shorter for the fully water blown rigid foams than that for the fully cyclopentane blown foams. The density of foam samples decreased from 45.0 kg/m3 to 2..4 kg/m3 with the increase of water level from 3 pph to 7 pph. Compressive strength exhibited the similar behavior with density. The average cell size of foam samples ranged from 2.1 μm to 356 μm with the increase of water level from 3 pph to 7 pph, respectively. At the same time, poorer dimen- sional stability was encountered with the increase of average cell size due to fast diffusion rate of Co2.out of the foam. The results of thermal analysis show that the glass transition temperature (Tg) shifted to a higher temperature with the increase of isocyanate level when more water was used as chemical blowing agent.

关键词： polyether polyol, polyurethane rigid foam, compressive strength, dimensional stability, cell size, glass transition temperature.

WELL-poSEDNESS FoR THE CAUCHY pRoBLEM To THE HIRoTA EQUATIoN IN SoBoLEV SpACES oF NEGATIVE INDICES

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2005年第1期26卷 75-88页

作者： HUoZHAoHUI JIAYUELING graduateschool ChinaAcademyofEngineeringPhysicsP.O.Box2101Beijing100088China academyofMathematicsandSystemSciences ChineseAcademyofSciencesBeijing100080China

The local well-posedness of the Cauchy problem for the Hirota equation is established for low regularity data in Sobolev spaces Hs(s ≥ -1-4). Moreover, the global well-posedness for L2.data follows from the local well-posedness and the conserved quantity. For data in Hs(s ＞ 0), the global well-posedness is also proved. The main idea is to use the generalized trilinear estimates, associated with the Fourier restriction norm method.

关键词： Fourier restriction norm Trilinear estimates Hirota equation Low regularity Global well-posedness

Stability of plane Wave Solutions for the Ginzburg-Landau-BBM Equations (II)

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 1999年第1期4卷 68-71页

作者： Murong JIANG (Department of Mathematics, Yunnan University, Kunming 650091, china) (graduate {2. of china academy of engineering and physics, p.o.box 2.01, beijing, china) E-mail. jiangmr@*** Department of Mathematics Yunnan University Kunming 650091 China graduate school of {2. academy of engineering and physics P.O.Box 2101 Beijing China

In part (I) of this paper, the stability of plane waves for the GinzburgLandau-BBM equations has been proved. Here, the perturbation decays are obtained by using the Fourier transformation and semigroup estimates.

关键词： decay estimates semigroup the Ginzburg-Landau-BBM equations

THE GLoBAL WELL-poSEDNESS oF THE SMoLUCHoWSKI EQUATIoN FoR RoTATIoNAL MoTIoN oF RoDLIKE poLYMERS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2003年第4期16卷 550-556页

作者： ZHANG Xiaoyi(The graduate school of {2. academy of engineering physics, p.o. box 2.01,beijing 100088, {2.) The graduate school of {2. academy of engineering physics P.O. Box 2101 北京 100088

In this paper, we prove the global existence and uniqueness of non-negative classical solutions of the Smoluchowski equation with viscosity ε>0. The existence of weak solutions when ε=0 is also obtained.

关键词： smoluchowski equation global existence non-negative solution

Ashkin-Teller Formalism for Elastic Response of DNA Molecule to External Force and Torque

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical physics 2008年第2期49卷 525-528页

作者： CHANG Zhe~1 WANG ping~(1,2. ZHENG Ying-Hong~(1,2. 1 Institute of High Energy physics,the Chinese academy of Sciences,p.o.box 918(4),{2. 100049,china 2.graduate school,the Chinese academy of Sciences,{2. 100049,china Institute of High Energy physics the Chinese Academy of Sciences P.O. Box 918(4) Beijing 100049 China graduate school the Chinese Academy of Sciences Beijing 100049 China

We propose an Ashkin Teller-like model for elastic response of DNA molecule to external force and *** base-stacking interaction is described in a simple and uniform *** obtain the phase diagram of dsDNA,andin particular,the transition from B form to the S state induced by stretching and *** elastic response of thessDNA is presented also in a unified *** close relation of dsDNA molecule structure with elastic response isshown *** calculated folding angle of the dsDNA molecule is 59.2..

关键词： dsDNA elastic property