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检索条件"主题词=variational technique"
共 6 条 记 录，以下是1-10 订阅
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Estimating Heat Fluxes by Merging Profile Formulae and the Energy Budget with a variational technique
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Advances in Atmospheric Sciences 2004年 第4期21卷 627-636页
作者： 张述文 邱崇践 张卫东 Department of Atmospheric Sciences Lanzhou University Lanzhou 730000 School of Physical Science & Technology Lanzhou University Lanzhou 730000 variational technique (VT) is applied to estimate surface sensible and latent heat fluxes based on observations of air temperature wind speed and humidity respectively at three heights (1 m 4 m and 10 m) and the surface energy and radiation budgets by the surface energy and radiation system (SERBS). The method fully uses all information provided by the measurements of air temperature wind and humidity profiles the surface energy budget and the similarity profile formulae as well. Data collected at Feixi experiment station installed by the China Heavy Rain Experiment and Study (HeRES) Program are used to test the method. Results show that the proposed technique can overcome the well-known unstablility problem that occurs when the Bowen method becomes singular in comparison with the profile method it reduces both the sensitivities of latent heat fluxes to observational errors in humidity and those of sensible heat fluxes to observational errors in temperature while the estimated heat fluxes approximately satisfy the surface energy budget. Therefore the variational technique is more reliable and stable than the two conventional methods in estimating surface sensible and latent heat fluxes.
A variational technique (VT) is applied to estimate surface sensible and latent heat fluxes based on observations of air temperature, wind speed, and humidity, respectively, at three heights (1 m, 4 m, and 10 m), and ... 详细信息
来源： 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Approximate Analytical Solution of Blasius' Equation
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Communications in Nonlinear Science and Numerical Simulation 1999年 第1期4卷 75-78页
作者： Jihuan HE (Shanghai institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China) Email:glliu@*** Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China
The Blasius’ equation, with boundary conditions, is studied in this paper. An approximate analytical solution is obtained via the variational iteration method. The comparison with Howarth’s numerical solution reveal... 详细信息
来源： 同方期刊数据库 同方期刊数据库 评论
A variational Model for an AsymptoticMagnetohydrodynamic System
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Communications in Nonlinear Science and Numerical Simulation 1998年 第3期3卷 176-179页
作者： Jihuan HE(Shanghai University, Shanghai Institute of Applied Mathematics and Mechanics,Shanghai 200072, China)Email: glliu@*** Shanghai University Shanghai Institute of Applied Mathematics and Mechanics Shanghai 200072 China
In the present paper an asymptotic gas magnetohydrodynamic system isformulated in veriational principles for the first time via the semi-inverse method proposedby He. Thus, a new theoretical basis for the trite elemen... 详细信息
来源： 同方期刊数据库 同方期刊数据库 评论
A Generalized variational Principle for Coupled Thermoelasticity with Finite Displacement
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Communications in Nonlinear Science and Numerical Simulation 1998年 第4期3卷 215-218页
作者： Jihuan HE Gaolian LIU and Weibing FENG (Institute of Appl. Math. & Mech., Shanghai Uni., Shanghai 200072, China)E--mails glliu@*** Institute of Appl. Math. Mech. Shanghai Uni. Shanghai 200072 China
Via the semi-inverse method proposed by He, a generallied variational principle of classical type (not Gurtin -type & not involving convolutions) for the entitled problem of linear anisotropic materials has been obta... 详细信息
来源： 同方期刊数据库 同方期刊数据库 评论
Approximate Analytical Solution of Blasius'Equation
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Communications in Nonlinear Science and Numerical Simulation 1998年 第4期3卷 260-263页
作者： Jihuan HE(Shanghai University, Shanghai Institute of Applied Mathematics and Mechanics,Shanghai 200072, China)Email: glliu@*** Shanghai University Shanghai Institute of Applied Mathematics and Mechanics Shanghai 200072 China
The Blasius’ equation f"’ + ff"/2=0, with boundary conditions f(0) =f,(0)0, f’ (+∞)=1 is studied in this paper. An approximate analytical solution is obtained via the variational iteration method. The comparison w... 详细信息
来源： 同方期刊数据库 同方期刊数据库 评论
variational Approach to a Strictly Hyperbolic System of Conservation Laws with Singularity
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Communications in Nonlinear Science and Numerical Simulation 1998年 第3期3卷 179-183页
作者： Jihuan HE(Shanghai University, Shanghai Institute of Applied Mathematics and Mechanics,Shanghai 200072, China)Email: glliu@*** Shanghai University Shanghai Institute of Applied Mathematics and Mechanics Shanghai 200072 China
Via the send-inverse method proposed by He, a variational principle isestablished for a system of two conservation laws which is strictly hyperbolic. Applyingvariational technique with variable-domain, the Rankine-Hug... 详细信息
来源： 同方期刊数据库 同方期刊数据库 评论
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