查询词典 heat conductivity

Also, by providing such heat insulating layer as an oxide intermediately in a grain boundary of a compound of CoSb3 in a sintered body, the heat conductivity is reduced.

而且，通过在烧结体的CoSb3系化合物晶界中插入氧化物等绝热层，可降低导热系数。

In the investigation,the finite-element software ANSYS was adopted to simulate the temperature field,and the effects of heat conductivity,specific heat and some boundary conditions such as sunlight radiancy and wind speed on the temperature field were analyzed.

应用有限元软件ANSYS对温度场进行模拟，分析了太阳辐射、风速等边界条件和导热系数、比热等计算参数对温度场的影响，并提出了相应的建议值。

The Ultra-Fine-Grained copperwith fine structure performs excellent properties,such as ductibility,electrical conductivity and heat conductivity and so on.It has become an important raw material in the following industrial departments as electric apparatus instrument,chemical industry, shipbuilding,aviation and machinery,etc.,and has wide application prospects.

超细晶铜材因具有微小的细晶结构而表现出了优异的延展性、导电性以及导热性等性能，已经发展成为了电器仪表、化工、造船、航空、机械等工业部门中的重要原料，具有广阔的应用前景。

Superconductive heat tube has a very low heat capacity and a very quick heat conductivity (over 1000 times than that of copper), so it is a fast heat conductive tube.

清华航空超导热管有一个非常低的容量，并且有着异常迅速的热传导性(是铜传热速度的1000倍以上)，是一个快速热传导管。

Using cement to prepare the sensible heat storage material,and it is for improving the capability of material by interfusing some matters which have large heat capacity and high heat conductivity.

研究表明：当铝酸盐水泥含量为10%时，材料的抗压、抗折强度能满足工业需求；材料的比热容随温度的升高先增大，在500℃时达到最大，后随着温度的升高反而降低；材料的热导率随着石墨粉含量的增加几乎成直线上升，当石墨含量为5%时材料的热导率大于1.7W/。

Using cement to prepare the sensible heat storage material,and it is for improving the capability of material by interfusing some matters which have large heat capacity and high heat conductivity.

采用水泥作为材料的胶凝剂，添加热容、热导率大的物质作为骨料来制备混凝土储热材料。

The heat conductivity of material improves rapidly by the content of the graphite increasing,and the heat conductivity preponderates over 1.7 w/ when the content of graphite is 5% in the material .

材料的热导率随着石墨粉含量的增加几乎成直线上升，当石墨含量为5%时材料的热导率大于1.7W/。

In first, a new short time formula of one dimension heat conduction differential equation, based on the theory of one dimension transient method, is presented for thermophysical property measurement of wood. The result of testing on red pine and larch wood arc satisfied by new method.In succession, the relationship between heat conductivity of wood and moisture, density, porosity, temperature and grain is studied experimentally in the range from 25 to 100℃. The result shows that, the heat conductivity is in direct proportion to density. but in inverse proportion to porosity. The heat conductivity of air-dried wood increased probably linear with the temperature rising. And that heat conductivity along the grain of wood is higher than that cross the grain. The former is 1.8 or 2 times of the latter.

文中研究了25～100℃范围内，气干木材的导热系数与含水率、密度、孔隙率、温度及热流方向的关系，研究表明：木材导热系数与密度成正比关系，与孔隙率成反比关系：对于针叶材，导热系数与密度及孔隙率成线性变化关系，而对于阔叶材其变化关系近似成二次曲线；气干木材的导热系数随着温度的升高近似呈线性增加：热流平行于纹理方向的导热系数大于垂直于纹理方向的导热系数，两者的比值大约在1.8～2之间。

The heat conductivity calculation has been divided into two parts, form the borehole to the exposure of cement mantle and in the formations, as for corresponding to different borehole structures, different methods have been adopted to sum the overall heat transfer coefficients and numerical method is used to calculate the heat loss on each nodal point, furthermore, through the model proposed herein, the degrees of influences of different borehole structures on heat loss could be calculated in order to get the most economic and efficient borehole structure.

把导热分为井筒到水泥环外壁和地层导热两部分计算，对不同的井筒结构采用不同方法计算总传热系数，数值法求解每个节点处的热损失，并通过模型对比计算了不同井筒结构对井筒热损失的影响程度，得到最经济有效的井筒结构。

The theories proposed by Wilson (1994) were adopted to describe the fundamental behaviors of temperature and variation of suction of soil. The Darcy's law and Pick's law described the flows and evaporation of water respectively. Some proposed assumptions including the characteristic curve of volumetric water content and hydraulic conductivity were only related to the suction of unsaturated soil. The coefficient of latent heat for water was a linear function of temperature; and the heat conductivity was calculated according to the equation proposed by De Vries.

对于土体的温度和吸力变化特征，采用Wilson提出的理论加以描述，在此理论中，分别利用Darcy和Fick定律描述水和蒸汽的流动规律，土水特征曲线和水力传导系数假定仅仅相关于非饱和土吸力，水的潜热系数是温度的线性函数，温度传导系数采用De Vries建议方程加以计算。

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％。