对流

On the basis of the conservation equation of continuous medium and in combination with mechanics of fluid through porous media and the heat transfer theory in porous media, conservation equations in porous media (continuous equation, momentum equation and energy equation ) are derived, When constructing the downhole temperature model, heat transfer in a wellbore is considered as the heat transfer in a vertical tube, the flow in a wellbore considered as sufficiently parallel flow, heat transfer in injection zones considered as heat conduction and convection in porous media, the flow in injection zones considered as flow through porous media, heat transfer in adjacent rocks considered as heat conduction in porous media.

在建立井下温度场模型时，把井筒的传热看作是竖直圆管中传热问题，把井筒的流动看作是充分发展的层流流动；把注入层中的传热看作是多孔介质中导热和对流的传热问题，把注入层中的流动看作是渗流；把围岩中的传热看作是多孔介质中导热问题。

At last, the particle movement and theadvection-diffusion movement of pollutant in Tianjin sea area were carried out.

最后，考虑了排污的影响，计算了天津海域排污口处的质点在渤海海域的运动状况和排出污染物的对流扩散运动及其分布。

The study of ore-forming rules indicates that the shearing force came from interaction of plate-plate is the initial force, which result in remelting of deep rock. Early formed faults and later dome structures provide favourable passage-way for ore-material migrating. Finally due to complete circulate convection, ore-material experience a process of complete differentation and begin to crystal and settle in certain circumstance. In some favourable tectonic zone ore-forming material enriched to deposit.

对成矿机制的研究显示板块作用产生的剪切力是造成区内深部岩石重熔的源动力，而早期形成的断裂体系及后期形成穹窿构造为矿物质的运移提供了有利的通道，在完善的循环对流机制配合下，成矿物质在迁移过程中发生较为充分的分异作用，各类矿物质在相应的物化环境中结晶沉淀，并在有利的构造部位富集成矿。

The strong pedagogic potential of Heat Convection is enhanced by the following ancillary material ...

热对流的很强的教师的潜能被以下的辅助素材提高

Three stages and two abrupt jumps exist in the climatological onset process of Bay of Bengal summer monsoon:(1) on Pentad 23, westerly and convection start to build up in the southeastern part of BOB.

气候学意义下孟加拉湾夏季风的建立进程表现为三个阶段和两次突然北跳：(1)西风及对流活动于第23候在孟加拉湾南端开始建立。

The relationships between wind field at low level and convection activities over the South China Sea are investigated based on pentad wind and OLR data from NCEP. The onset time and intensity of SCS summer monsoon are determined by area-averaged zonal wind component over central and south SCS. So we possess long-term time sequence of SCS summer monsoon activities for the period of 1949～1998. Interannual and interdecadal variations are examined by using this time series.

利用NCEP风场资料和候平均向外长波辐射资料分析了南海区域低层风场与对流活动的关系，在此基础上，采用南海中南部的纬向风平均值来定义南海夏季风的爆发，确定了长序列（1949～1998）的南海夏季风爆发日期和强度指数，并研究南海夏季风活动的年际和年代际变化特征。

The operation of periodic flow reversal is a new kind of unsteady-state reaction techniques.

流向变换周期操作是一种非稳态催化反应新技术，其反应器模型一般为非线性反应－对流－扩散方程的新型定解问题。

A system of singularly perturbed convection-diffusion problems is considered.

考虑奇异摄动对流扩散方程组在Bakhvalov-Shishkin网格上的迎风差分策略。

And then simulations of gas-particle two phase plane wake and gas-particle two phase plane jet were carried out by using this model.

在对流场特性进行全面分析的基础上，根据对气相流场采用大涡模拟，对颗粒相运动采用Lagrangian方法进行求解的思路，建立了二维气粒两相湍流流动数值模拟的数学模型。

In heat transfer by conduction an convection,the potential difference is the temperature difference.

在热传递上由传导对流，电位差是温度区别。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷