对流

At present, the treatment on cerebral edema is still using the dehydrator to recede the intracranial pressure, but the in influence on fluid balance, renal function or circulation have been acknowledged, there is not other better dehydration technique to take place of dehydrator yet.

HVHF具有强大的对流作用，能有效地第一军医大学2001级博士学位论文导师：徐如祥教授清除分子量在30，000道尔顿中、小分子溶质，其中包括相当数量的炎症介质、细胞因子，从而改善了炎症介质反应过程；同时，HVHF能受控制地、等渗地脱水；通过床边滤过机能很好地控制体温并能更精确地调整机体赖以生存的内环境。

Hot fluid calcite carbolic isotope ‰ of ~2.9 of ‰ of =-1.2 of δ 13C calcite, show among them C basically originates fluid convection is opposite in circular process of layer of the carbonate in base rock deliquescent.

热液方解石碳同位素δ13C方解石=-1.2‰~2.9‰，显示其中的C主要来源于流体对流循环过程中对基底岩石中碳酸盐地层的溶解。

The results showed that the frame density and particle size distribution of the catalyst have significant impacts on the fluidization performances.

结果表明，HCC催化剂的骨架密度、筛分组成等物理性质对流化行为影响很大。

This paper studies the main geometrical parameter such as angle, height, width, stagger and the upper width in dentation and trapezoid flow path, firstly, uses the single-phase numerical simulation of the computational fluid dynamics technique to analyse the influence of different geometrical parameter on discharge coefficient and flow state exponent of drip emitter. Secondly, uses the two-phases numerical simulation of CFD (1% sand content ) to analyse the influence of the above mentioned geometrical parameter on the contribution regulation of sand and anti-clogging performance. Thirdly, uses the PIV （ particle Tracking Velocimetry ） technique which can see the small-scale flow path to observe and test the trajectories and velocities of solid particles in labyrinth flow path, and analyses the basic factors which can influence the movement characteristic of solid particles and the flow state in flow path.

本文以齿形流道、梯形流道为主要研究对象，以流道转角、流道高，流道宽、偏差量及梯形流道上底宽为主要结构参数，首先应用 CFD 单相流数值模拟技术对不同结构参数灌水器流道水力性能进行模拟，分析了不同结构参数对流态指数和流量系数的影响，其次，应用 CFD 两相流（含沙量为1%）数值模拟技术分析了结构参数对含沙量分布规律和抗堵塞性能的影响，然后，应用 PIV 可视化测试方法测试了固体颗粒在流道内运行轨迹及速度，分析了影响固体颗粒运动特性及流道内流体流态的基本因素，最后，对上述流道结构形式通过模具加工及滴灌带试制，进行了标准化测试（ GB/T 17187-1997 农业灌溉设备滴头技术规范和试验方法与 ISO 标准 ISO /TC23 /SC18 /WG5N4短周期堵塞测试程序），测试结果验证了 CFD 模拟结果，并提出了迷宫结构流道灌水器的抗堵塞设计方法。

Many natural phenomena and physical laws can be described by time dependent nonlinear differential equations, such as heat conduction equation, sound wave and elastic wave equation, reaction diffusion and convection diffusion equation, fluid and aerodynamics equations, etc.

大多数的自然现象与物理规律都可归结为与时间相关的非线性偏微分方程，诸如热传导方程、声波与弹性波方程、反应扩散与对流扩散方程、流体与气体力学方程组等发展方程。

Cavity flows both with and without sound excitation are studied by solving the 2 D time dependent Reynolds averaged Navier Stokes equations using explicit predictor corrector difference algorithm of Mac Cormack.

采用显式MacCorma－ck二步预估校正有限差分格式，求解二维雷诺平均非定常Navier－Stokes方程；并用Cebeci－Smith代数紊流模型作适当修正来模拟紊流效应，对有、无前缘声激励两种情况的空腔流场作了数值模拟，计算的振荡频率及振荡幅值都与实验结果基本符合，并且较好地模拟出了声激励对流场的影响。

Our model is subdivided into three categories, each category suit the heat exchanger of deferent type: the furnace, convective surface and trisector air preheater, all these categories use clean factor as the indication of the soot desposition level.

首先介绍了锅炉灰污染危害的现状，对比研究了国内外的灰污染监测手段和监测模型，并针对北仑1#锅炉，建立了锅炉各受热面灰污染监测模型，这些监测模型分为炉膛、对流受热面、以及三分仓空预器三种类型，采用清洁因子作为受热面灰污染状况的指标。

Although the isoscalarmeson exchange currents contribute little to cross section, they have large effectto 〓/〓, which is the ratio of two structure functions of the deuteron.

尽管同位旋标量的π-反冲流、π-对流对截面的贡献不大，但对结构函数之比〓／〓却起很大的作用。

The magnetic buoyancy forces for paramagnetic and diamagnetic fluids are deduced.

分别针对顺磁性和逆磁性流体，推导了热磁对流的磁浮升力。

The mud diapir structure in Yinggehai Basin,South Chian Sea,was been formed and evoluted mainly by thermodynamic actions.

莺歌海盆地泥底辟构造主要是在热动力作用下形成和演化的，包括热传导和热对流作用。

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％。