对流

In the middle-lower level, it is similar to the convectional motion and develops in immovable areas; but in upper level, the developed convection will spread downstreamly.

它在中低层更接近对流性运动，且在固定区域发展；而在高层，对流环流发展之后，向下游传播。

The main purpose is to make the convective scheme more active, thus reducing the grid scale convection.

改进的主要目的是使对流参数化方案更活跃，从而减少格点尺度对流的发生。

Specification for installation of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances - Gas fires, convector heaters, fire/back boilers and heating stoves 1st, 2

燃气炉、对流式加热器、回火锅炉和有装饰性燃料效果燃气器具规格。用1类、2类、3类家用燃气的燃气炉、对流式

Criterion GrD, modified by D'arcy law, is used to show the characteristic of natural convection in t...

高度H愈小，G_r~D也愈小，因而形成沟槽偏析的枝晶间液相对流也愈小，对流的减小有利于沟槽偏析的减轻。

The diffusion of mass or heat across two phases is extensively involved in chemical processes. Because of the effect of this kind of diffusion, there will be a inhomogeneous distribution of material concentration and then a gradient of interfacial tension will be occured on the interface of the two phases. When the gradient tends to a certain value, the natural convection would be induced derivatively, and orderly convective cells would appear in the system simultaneously. This is the so-called Marangoni phenomenon.

在化工过程中，广泛涉及到两相间的质量或热量扩散，由于这种扩散的作用，将在相界面处产生物质浓度的不均匀分布，从而出现界面张力梯度，这种梯度达到一定值以后，将出现派生的自然对流运动，并且在系统中呈现有序的对流胞结构，这就是所谓的Marangoni现象。

Mainly, we deriver time-accurate wavelet-based schemes for convection equation ,furthermore, we use it for numerical solution of convection equation and make a comparison with exact solution and solution derived from WGM.

主要的，对于对流方程，推导出了时间精度高的基于正交小波基的小波泰勒伽略金格式，进一步用这个格式计算了对流方程的数值解，并和WGM格式得到的数值解以及精确解作了比较，从而验证了格式的正确性。

We have revisited the problem of the solar p-modes generation by turbulent stress in outer part of the Sun, and demonstrate that the generation of acoustic waves by the turbulent convection is dominated by quadruple emission because of destructive interference between monopoly and dipole emissions.

在传统的对流混合程理论的基础上，借助于湍流的现象中雷诺数与不稳定性、湍流与涡旋等物理量的类比考虑，我们提出了一种描述湍流能谱的改进形式，认为对流区湍流能谱能够分离成时间和空间两部分。

According to the theory of flow diffusion and convection, three-dimensional state equation of radon field is established for constant and variable diffusion coefficient and convection rate. The numerical solutions for different coefficient and different boundary conditions are obtained for two models of radon field which have respectively source in the side and inside of collapse column.

根据流体场的扩散理论和对流理论，建立了扩散系数与对流速度为常量或变量情况下的氡气场三维状态方程；对於陷落柱柱体侧面有源氡气场和柱体体内有源氡气场两种理论模型，给出了不同系数和边界条件下的数值解的形式。

Through the numerical computation and comparison with the exact solutions of one dimensional linear convection equation and nonlinear equation, accuracy of the first order upwind scheme is analyzed in detail.

摘 要：通过对一维线性对流方程和一维非线性对流方程的数值求解，对一阶迎风差分格式的精度作了较详细的分析。

In this paper we finded several explicit and similarity solution to the so-callednonlinear Fokker-Planck equationsut =xx +xfor ∈ S with initial datum u(x, 0)=δ, where the physical constants m ≥ 1 and n ≥ 0and δ is Dirac measure.

本文讨论对流扩散方程：的相似源型解。由于方程具有对流项且初始值为Dirac测度，特别当m＞1时方程在{u＝0}处退化，给求解造成实质的困难。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。