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By solving this equation the optimal velocity field has been obtained, which leads to the best heat transfer efficiency in convection.

1引言 对流换热过程的整体性能取决于速度场和温度场的分布特性,改变速度场是强化对流换热的一个最直接的途径。

The Earth possibly is one by occupies the major part material stably the counter-flow inner layer as well as occupies the few parts the counter-flow outer layer to be composed, the former is constitutes the Earth quite stable movement, the attraction, the magnetic field and so on the macroscopic phenomenon foundation; The latter constitutes the Earth most to be rich in the change the beautiful semblance, such as: Land, islands, volcano, earthquake, plate movement and so on nature environment with each kind of great phenomenon, eliminate this this also are decide the Earth for the perfectly round spheroid basic reason, because the internal heat circular reactions is from starts, the huge energy finally becomes the Earth good fortune a beautiful rich life the star.

地球可能是一个由较稳定占绝大部分物质的对流内层以及占较少部分的对流外层组成,前者是构成地球比较稳定的运动、引力、磁场等宏观现象的基础;后者则构成地球最富于变化的美丽外表,诸如:陆地、岛屿、火山、地震、板块运动等等自然界环境与各种伟大的现象,除此这也是决定地球为浑圆球体的根本原因,因为内热循环反应是从一点开始的,巨大的能量最终把地球造化成一颗美丽的富有生命的星球。

Thicknesses of fractured-rock layer in highway embankment corresponding to the initial point and end point of the rapid increase region were defined as the minimum and maximum thicknesses of fractured-rock layer constructed, which triggered winter-time natural convection, respectively.

通过引入自然对流指数,分析了自然对流降温效应随路堤碎石层填筑厚度的变化规律,其可分为恒零区、急增区和缓变区3个阶段,急增区的起点和终点对应于路堤碎石层填筑的最小厚度和最大厚度。

Occurrence and development of winter-time natural convection cooling effect in the fractured-rock embankment of Qinghai-Tibet highway were investigated using the governing equations based on air-flow function for natural convection in porous media with variable permeability.

通过变渗透率多孔介质流函数控制方程,分析了青藏公路碎石路堤冬季自然对流降温效应的发生和演化过程。结果表明:公路碎石路堤冬季自然对流降温效应从边坡区域最先开始形成,并随着冬季路面温度下降而逐渐向路堤中间区域发展。

A pure advective problem and a pure diffusion problem verify the algorithm. The model is used to simulate salt transport in Oujiang estuary.

通过纯对流和纯扩散算例对模型进行检验和验证,结果表明,模型能够较好地模拟物质输运的对流扩散问题。

Over the northern SCS, analysis results find the lower troposphere is convectively unstable during the entire onset period. The favorable atmospheric conditions for convection are attributed to low-level moisture convergence caused by the frontal southwesterly flow during the first stage, and the retreat of western Pacific subtropical high and warm-moist southwesterly flow from the Bay of Bengal during the later stages.

分析结果显示,在1998年南海夏季季风肇始发展过程中,南海北部的大气大多呈现对流不稳定的形势,第一阶段锋前西南气流造成低层强烈的水气辐合,第二阶段之后锋面远离且太平洋副热带高压东退,来自孟加拉湾的西南气流夹带大量暖湿水气使得南海北部在整个季风肇始期间都是有利於对流的状况。

The evolution of orogenic zone,gold ore-formation and its dynamic mechanism are studied and the new viewpoint is put forward that thermal stress is a main controlling factor in metamorphism,formation ,evolution of structure and ore-forming geodynamic environment. The critical condition of fluid convection in porous equal medium and the new conclusion is reached first that the thickness of structural layer and temperature gradient are main factors influencing fluid convection andtransport of ore-forming matters in additional to physical properties of rocks. According to the conclusion some mechanisms such as the transform from compressive type to tensile one of erogenic zone,transport and accumulation of ore-forming matters such as gold and so on and many ore-forming temperature values are interpreted qualitatively.

探讨了区内造山带演化、金成矿及其动力学机理,提出了热应力是影响变质作用、构造形成演化及成矿地球动力学环境的主控因素的新认识;对多孔均匀介质中流体对流的临界条件进行探讨,首次提出了除岩石物理性质外,构造层厚度和温度梯度是影响流体对流乃至矿质输运的主要因素。

In situ wall conduction technologies include Shell's ICP, ExxonMobil's ElectrofracTM, and IEP GFC (Independent Energy Partners' Geothermic Fuels Cells Process); b.

在此,详细介绍了壳牌石油公司地下转化工艺技术、埃克森美孚公司ElectrofracTM技术、IEP公司GFC技术等3种传导加热技术,还介绍了太原理工大学的对流加热技术、雪弗龙CRUSH技术等5种对流加热技术,以及2种辐射加热技术,并分析了各类工艺的优缺点。

In the third section, the asymptotic behaviors of the solution for the generalized Burgers equation with convective function and nonconvective function are analyzed, respectively, both of which tend to the corresponding steady equation.

分别讨论了广义Burgers方程(0.2)在有对流流函数f及无对流流函数时解的渐进行为,它们分别趋于相应定常问题的解。

Simulations of echo intensity,maximum precipitation without orographic effects are much weaker than observations;and they are much improved and closer to the reality after consideration of orographic effects.

理想地形的对流过程虽然不能模拟出对流群中多单体的生消过程,但最大降水强度和累积降水都比平坦地面的大,更接近实测结果。

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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%。

However, to get a true quote, you will need to provide detailed personal and financial information.

然而,要让一个真正的引用,你需要提供详细的个人和财务信息。