Free convection has been defined as a flow driven by density variations.
自由对流是一种由于流体的密度变化而产生的流体的运动。
Primary researches on the groove density variations of bending grating were experimented.
对压弯光栅的线密度进行了实验研究。
The density variations of deformed powder metallurgical molybdenum bars were tested by using suspending weight method.
通过悬重法测量热变形后粉末冶金钼坯致密度的变化情况。
Variations in wood density affect vibrations, and therefore, sound.
木材密度的变化会影响振动，因此也会影响声音。
Variations in the composition of the planets are largely responsible for the density differences.
行星构成成分的不同是造成密度差异的主要原因。
Additionally, powder density may be affected as a result of the settling which may cause slight variations in the stick pack serving size.
由于解决，一个粉自然发生，在粉末的最高水平的变化可能不同包装坚持坚持包。
It is not speed, but variations in speed that cause density waves.
并不是速度高低引起了拥堵波，而是速度的不一致性。
In this paper, variations of AE-D's perigee altitudes, the corresponding atmospheric expansion and the density distributions are analyzed.
本文分析了AE D极轨卫星近地点的变化及其相应的大气膨胀和密度分布情况。
In the millimeter band, the variations are found of the power density of the rain clutter induced by back scattering with frequency and rain rate.
在毫米波段计算了雨区的后向散射引起的雨杂波功率密度随频率及降雨率的变化。
By use of the common formula for solving the time variations of the crustal density, the approximative plane formula is derived and its numerical calculation method is given.
采用求解地壳单层密度变化的一般公式，导出其平面近似公式并给出了相应的数值计算方法。
The assumption is made that P-wave velocity, S-wave velocity, density and Q factor show lateral piecewise linear continuous variations in block media.
假定介质为块状，且块中纵，横波速度及密度、品质因数横向分段线性连续变化。
When laser beam is incident on an inhomogeneous isotropic plasma, the variations in density profile perpendicular to main density gradient may develop, producing a rippling of critical surface.
当激光入射到非均匀的各向同性等离子体时，垂直于主密度梯度方向的密度分布会发生变化，使临界面呈现波纹。
In thiS model, non-uniformly variations of soil density and shear modulus with depth are taken into consideration. Numerical computations are conducted for typical cases.
在本模型中考虑了土壤特性（如密度与剪切模量） 沿深度的非均匀变化，通过对典型场地剖面的数值计算探讨了有关因素对场地地震反应的影响。
For a high plasma density and low applied voltage, the steady-state sheath thickness is more or less insensitive to variations in the spherical radius, but it is very sensitive under other conditions.
当等离子体密度较高、注入电压较低时，稳态鞘层厚度对于靶体半径的变化极不敏感。
This paper presents a novel method based on projection moire deflectometry for the visualization and quantitative evaluation of full-field density and temperature variations in phase object.
提出了一种新的投影云纹偏转法用于实时显示和定量测量位相物体的全场密度和温度。
After that it is pointed out that compared with soil density changes, water content change can result in more variations of coefficient of thermal conductivity and specific volume heat of loess.
相对于随密度的变化，黄土导热系数和比热容随含水量的变化尤为显著，含水量变化可以引起热参数较大的变化。
The ability of the ionosphere to reflect these waves is dependent upon normal variations in the electron density at different levels.
电离层反射电波的能力取决于不同高度上电子密度的正常差别。
The steady-state flows in drill pipe and in annulus are analyzed and the variations of pressure, gas void fraction, and multiphase-flow density along the well depth are simulated.
举例分析在环空和钻柱内的稳定流动过程中，随井深增加，压力、含气率、多相流体密度等的变化规律；
A proper integration of both azimuthal and radial variations in SAP flux density within a tree can be scaled for whole-tree transpiration, which can relatively accurately estimate stand transpiration.
对树木液流密度在径向和方位上进行适当的整合，可较准确地计算整树和林段蒸腾。
Scenarios are applied to the input parameters in the dynamic model to investigate the impacts of changes in these, including variations in material usage (concrete and wood) and material density.
在动态模型中，把各种方案作为输入参数，便可研究出这些参数变化的影响，包括材料的使用(混凝土和木材)和材料密度的变动。
The non-planarity of a surface post electroplating process is usually dependent on variations of key layout characteristics including line width, line spacing and metal density.
铜电镀工艺后表面的不平整度通常取决于版图关键特征，包括线宽，线间距和金属密度。
OBJECTIVE: To investigate the change laws of calcaneus bone density with age, body mass index (BMI) values and other variations of senior intellectual females in Shanghai.
目的：调查上海市高知女性骨密度随年龄、体质量指数等变化规律。
OBJECTIVE: To investigate the change laws of calcaneus bone density with age, body mass index (BMI) values and other variations of senior intellectual females in Shanghai.
目的：调查上海市高知女性骨密度随年龄、体质量指数等变化规律。
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