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ε-PSEUDO CHEBYshEV AND ε- QUASI CHEBYshEV SUBSPACES OF BANACH SPACES

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Analysis in Theory and Applications 2004年第4期20卷 350-357页

作者： sh. Rezapour Department of Mathematics Azarbaidjan University of Tarbiat Moallem Tabriz 51745-406 Iran

We will define and characterize ε-pseudo Chebyshev and ε-quasi Chebyshev subspaces of Banach spaces. We will prove that a closed subspace W is ε-pseudo Chebyshev if and only if W is ε-quasi Chebyshev.

关键词： ε-pseudo Chebyshev subspace ε-quasi Chebyshev subspace

Preliminary study on search for genes for early embryonic development in goldfish by mRNA differential display

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Chinese Science Bulletin 1997年第13期42卷 1133-1135页

作者： Li, sh Han, W Ma, HF Institute of Developmental Biology Chinese Academy of Sciences Beijing 100080 China

MATERNAL RNAs stored in eggs play an essential role during the initial stage of embryonic de-velopment in animals and they are degraded as the development proceeds. In some animals (e.g. fish and amphibian), zygotic genes begin to transcribe new mRNA only when the embryosdevelop to about midblastula stage. This degradation of maternal RNA and synthesis of

关键词： mRNA differential display early embryonic development gene goldfish.

Two-dimensional Modeling of a Salt-gradient Solar Pond with Wall shading Effect and Thermo-physical Properties Dependent on Temperature and Concentration

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Journal of Thermal Science 2011年第4期20卷 362-370页

作者： Mohsen Mazidi Mohammad Hassan shojaeefard Mohammad sh.Mazidi Hossein shojaeefard Mechanical Engineering Department Islamic Azad University School of Mechanical Engineering Iran University of Science and Technology Management Business Administration Department Amirkabir University of Technology

In this paper,the behavior of a salt-gradient solar pond with the square cross-section has been studied experimentally and numerically.A small-scale solar pond were designed and built to provide quantitative data.A two-dimensional,transient heat and mass transfer model has been solved numerically by using finite-control-volume *** this study,all the thermo-physical properties are variable as the function of temperature and salt *** results as obtained for the experimental pond have been satisfactorily compared and validated against measured ***,the wall shading effect has been elaborated to improve the agreement between two sets of *** temperature of the storage zone is predicted well by the *** also can be observed that the initial concentration profile is preserved with *** stability of the pond in time has been investigated in order to distinguish the critical ***,the application of an energy analysis gives an efficiency of about 12%for the pond.

关键词： solar energy salt-gradient solar pond transient heat and mass transfer temperature and concentration profiles stability thermal efficiency

Age of the shahewan rapakivi granite in the Qinling Orogen, China, and its constraints on the end time of the main erogenic stage of this orogen

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Chinese Science Bulletin 1999年第21期44卷 2001-2004页

作者： Zhang, ZQ Zhang, GW Tang, sh Lu, XX Chinese Acad Geosci Inst Geol Beijing 100037 Peoples R China NW Univ Xian Dept Geol Xian 710069 Peoples R China Dept Geol Res Henan Province Zhengzhou 450053 Peoples R China

the Qinling Mountains in central China are a joint orogenic zone between the Sino-Korean (or North China) and the Yangtze (or South China) craton blocks, the two major tectonic units of eastern Asia. On the end time o... 详细信息

关键词： age rapakivi granite orogenic belt Qinling Mountains.

ON SUM AND QUOTIENT OF QUASI-CHEBYshEV SUBSPACES IN BANACH SPACES

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Analysis in Theory and Applications 2003年第3期19卷 266-272页

作者： H.Mohebi sh.Rezapour Faculty of Mathematics shahid Bahonar University of Kerman Department of Mathematics Azarbaidjan University of Tarbiat Kerman IranMoallem Tarbiat Iran

It will be determined under what conditions types of proximinality are transmitted to and from quotient spaces. In the final section, by many examples we show that types of proximinality of subspaces in Banach spaces ... 详细信息

关键词： proximinality Chebyshev subspace pseudo-Chebyshev subspace quasi-Chebyshev subspace equivalent norms

Laguerre reproducing kernel method in Hilbert spaces for unsteady stagnation point ow over a stretching/shrinking sheet

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Applied Mathematics(A Journal of Chinese Universities) 2021年第3期36卷 354-369页

作者： M.R.Foroutan A.S.Gholizadeh sh.Najafzadeh R.H.Haghi Department of Mathematics Payame Noor UniversityP O Box 19395-3697TehranIran

This paper investigates the nonlinear boundary value problem resulting from the exact reduction of the Navier-Stokes equations for unsteady magnetohydrodynamic boundary layer flow over the stretching/shrinking permeable sheet submerged in a moving *** solve this equation,a numerical method is proposed based on a Laguerre functions with reproducing kernel Hilbert space *** the operational matrices of derivative,we reduced the problem to a set of algebraic *** also compare this work with some other numerical results and present a solution that proves to be highly accurate.

关键词： nonlinear boundary value problem Laguerre reproducing kernel method operational matrix of derivative existence and nonexistence of solutions approximate solution

The Effect of Injected Air Bubble Size on the Thermal Performance of a Vertical shell and Helical Coiled Tube Heat Exchanger

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Energy Engineering 2021年第6期118卷 1595-1609页

作者： Saif S.Hasan Ali sh.Baqir Hameed B.Mahood Engineering Technical College Al-Furat Al-Awsat Technical UniversityAl-Najaf31001Iraq Department of Chemical and Process Engineering Faculty of Engineering and Physical SciencesUniversity of SurreyGuildfordGU27XHUK

In the present study,the effect of injecting air bubble size on the thermal performance of a vertical counter-current shell and coiled tube heat exchanger is experimentally *** experiments were accomplished in a cylindrical shape heat exchanger with a 50 cm height and 15 cm outer *** coil with 3.939 m equivalent length and 0.6 cm outer diameter was used to carry the hot fluid(water).Four different cold fluid(shell side)flow rates(Q_(s)=2;4;6 and 8 LPM)Þunder laminar flow conditions(316≤Re≤1223),constant hot(coil side)flow rate fluid rates(Q_(h)=1 LPM),four different injected air flow rates(Q_(a)=0:5;1;1:5 and 2 LPM),invariant temperature difference(ΔT=20°C),and constant bubble’s number(1400)were *** demonstrate the effect of bubble size,a sparger with orifice diameters of 0.1,0.8,and 1.5 mm was manufactured and used in the *** overall heat transfer coefficient(U),NTU,effectiveness,and pressure loss were *** experimental results clearly showed that the heat exchanger’s thermal efficiency significantly improved with increasing the shell side flow rate and the injected air flow *** maximum improvement in U,NTU,and effectiveness was 153%,153%,and 68%,*** thermal performance of the heat exchanger was shown to be improved with increasing the bubble *** the latter finding agrees with recent CFD published results,more studies need to be confirmed.

关键词： Sparger smooth helical coil vertical shell heat exchanger injection bubbles

Methylene green-mediated sensor highly sensitive to hydrogen peroxide based on entrapment of horseradish peroxidase in composite membrane of regenerated silk fibroin and poly(vinyl alcohol)

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Chinese Journal of Chemistry 1996年第4期14卷 359-366页

作者： Wu, YX Liu, HY Qi, DY Liu, YC Qian, JH Liu, sh Yu, TY Deng, JQ shANGHAI UNIV DEPT CHEM & CHEM ENGNSHANGHAI 200072PEOPLES R CHINA FUDAN UNIV DEPT MACROMOL SCI & CHEMSHANGHAI 200433PEOPLES R CHINA

A novel composite membrane of poly(vinyl alcohol) and regenerated silk fibroin was employed to immobilize horseradish peroxidase (HRP) and IR was used to give a useful insight into the structure of the composite membrane before and after ethanol treatment. A methylene green-mediated sensor sensitive to hydrogen peroxide was fabricated, based on the composite membrane as immobilization matrix for HRP. Cyclic voltammetry and amperometric measurement were for the first time utilized to demonstrate the suitability of methylene green as an electron transfer mediator between immobilized HRP and a glassy carbon electrode in bioelectrocatalytic reduction of hydrogen peroxide. Performance and characteristics of the sensor were evaluated in respect to response time, detection limit, applied potential and concentration of the mediator. The sensor possesses a variety of characteristics including good sensitivity, rapid response time and low detection of limit of 0.1 mu mol/L.

关键词： sensor poly(vinyl alcohol) regenerated silk fibroin methylene green horseradish peroxidase hydrogen peroxide

ON SIMULTANEOUS WEAKLY-CHEBYshEV SUBSPACES

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Analysis in Theory and Applications 2011年第2期27卷 117-124页

作者： sh. Rezapour H. Alizadeh S. M. Vaezpour Azarbaidjan University of Tarbiat Moallem Aazad Islamic University Amirkabir University of Technology

In this paper, we shall introduce and characterize simultaneous quasi-Chebyshev （and weakly-Chebyshev） subspaces of normed spaces with respect to a bounded set S by using elements of the dual space.

关键词： dual space best simultaneous approximation simultaneous quasi-Chebyshevsubspace simultaneous weakly-Chebyshev subspace