对流

By thermodynamically and dynamically calculating and analysing ,a new growth mechanism of spherical graphite has been proposed ,that is,the spherical graphite does not grow inwardly,but grow outwardly and when spherical graphite grow outwardly carbon atoms come into and fill-up the entocoele of spherical graphite by the diffusing way.

通过对石墨球最终表面的形态进行分析，可以获得气泡的表面并不是石墨球的最终表面，石墨球表面主要由于受到石墨球表面各微晶长大速度不均匀性、铁水中的三大起伏、微量元素与碳原子的竟相吸附、由于浓度梯度和温度梯度所引起铁水的对流等各种因素的综合影响结果使其表面成为凹凸起伏的形状

The equatorward movement of a middle latitude trough-front system into the South China may give rise to the retreating eastward of the subtropical high ridge over the South China Sea.

1994年南海夏季风建立于5月第一候，利用MM5成功地模拟了这一过程，并通过敏感性试验，讨论了中纬度系统和中南半岛及其附近地区的积云对流对夏季风环流建立的影响，结果表明：（1）南下接近副热带一定强度的中纬度槽－锋系统的强迫，可引起南海地区副热带高压脊的减弱东撤。

The integrated mathematic model of solidification is then established, which includes heat transfer, solute transfer, liquid flow and the movement of equiaxial crystals in solidification process.

本文通过两相流理论建立了等轴晶在对流金属液中移动的非稳态数学模型，推导了求解等轴晶在非稳态、非均匀液相流场中非稳态移动的数值表达式，并进一步推导了描述等轴晶在凝固过程中迁移、堆积规律的局部堆积方程式。

First, the death level of infant and pregnant woman was higher in floating populace, it is important to enhance the administration to floating fertilizable female populace, improve the infants' capability and cut down the infant mortality and maternal mortality.

一是流动人口中婴儿和孕产妇死亡水平较高，加大对流动人口中育龄妇女管理，提高出生人口素质，降低婴儿、孕产妇死亡刻不容缓。

Few studies have been carried out on the enhanced heat transfer mechanism of internally finned tube due to the complex and irregular external shape.

但由于内翅片的表面复杂和极不规则的外部形状，目前对其强化传热机理的分析和研究还很少，特别是在翅片结构尺寸等影响管内对流换热特性因素的系统研究工作还有待于进一步完善。

It is found that the fouling rate is lowered during subcooled fow boiling by carrying gas injection, and the influence of carrying gas injection on fouling of convective heat transfer is more obvious than that of subcooled flow boiling; morphology of CaCO〓 crystallization fouling exhibits self-similarity and the fractal dimensions of CaCO〓 crystallization fouling are determined from the gray scale distribution of the SEM images by box-dimension method. The value of the crystallization fouling surface fractal dimensions reveals the complexity of the surface, and can be used as an import parameter for the investigation of influence of carrying gas injection on scale formation.

实验发现：引入载气，过冷流动沸腾结垢速率降低，但引入载气对过冷流动沸腾结垢速率的影响要弱于对对流传热结垢速率的影响；CaCO〓结晶垢具有统计自相似性，即分形特征；用盒子维法测定了CaCO〓结晶垢的分维值，分维值的大小反映了换热面上生成的结晶垢表面复杂程度，可用于描述引入载气对污垢的形成作用。

Report of energy-saving, province, wind force is large; 2, low rotate speed, low noise; 3, 100 pages window adopts automation system, the automatic open of 100 pages mixes implementation fan shut, achieve dustproof, waterproof, beautiful result; 4, use air convective principle the steam outdoor, waste gas or peculiar smell ceaseless eduction outdoor; 5, by be being nodded at furnish ground is right to gate or window, flow into fresh air naturally, any fuggy and ventilated bad problems all att

节省能源、省电、风力大；2、低转速，低噪声；3、百页窗经过自行掌控体系，完成风机百页的自行开始和停闭，达到和实现防尘、防水、好看的作用；4、使用空气air对流的元理将室外的热气、污气或者怪味不停排岀室外；5、由于装设位置是对向大门或者窗子，自然而然流入新鲜空气air，任何凡热透风不好难题都可以获得显然改良；6、应用寿运长、易冲冼保护

The latest geopotential model, EGM96, was employed to compute the free air gravity anomaly, geoidal separation, the average density anomalies of the crust and the uppermost mantle, and the distribution pattern of the viscous stress exerted by mantle convection over Xinjiang and its neighboring areas.

利用最新的地球重力场模型，计算了新疆及邻近地区的自由空气重力异常、大地水准面扰动异常、地壳和上地幔平均密度异常以及地幔对流引起的岩石层底界面粘滞应力场分布。

Helically finned tube ; convection heat transfer ; local heat transfer

螺旋肋片管；对流传热；局部传热

The nonlinear hyperbolic conservation laws of the transient flow of the media in gas pipeline are hard to he solved, so, the control conservation laws are constituted of mass, momentum arid energy conservation laws, TVD/Godunov hydrid algorithm is used to simulate the transient flow in gas pipeline, and the traditional splitting approach processing nonlinear convection in momentum equation is dismissed ,the convection tern; is directly processed, in the way, the stablization of the algorithm and emulating accuracy of the transient flow are greatly improved.

针对管道中介质瞬变流动的非线性偏微分方程组难以解析求解的问题，由质量、动量、能量三个偏微分方程构成的控制方程组，应用TVD/Godunov混合算法数值模拟天然气管道中气体的瞬变流动，摒弃了传统的差分方法时动量方程非线性时流项的线性化处理，而直接处理非线性对流项，从而大大提高了算法的稳定性和管道瞬变流动的仿真精度。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。