导热系数

The light weight castables have low density, low thermal conductivity, high strength,good acid resistance and alkali resistance. They are suitable for middle and low temperature furnace linings, ceiling and mobile coover.

本公司生产的各种轻质耐火浇注料，具有容重轻、导热系数小、强度高、整体性强、气密性均匀，并有耐酸、耐碱作用，适用于中、低温热工设备的炉体、炉墙、炉顶和活动炉盖，经现场浇注后，使保温层变成整体，保温性能增强，是一种良好的新型节能材料。

There is a certain relationship between thermal conductivity and density of corkboard.

。。 一、刚画软木砖是低温绝热材料，它的导热系数是其热物理性能的主要指标，也是设计围护结构和其池热工计算不可缺少的主要参数。

Corkboard ; Thermal conductivity ; Density

的导热系数与其容重的关系，如图1¨。

Measurements of sources at cryogenic temperatures pose special problems since the connections between the sample in the cryostat and the voltmeter are often made of metals with lower thermal conductivity than copper, such as iron, which introduces dissimilar metals into the circuit.

测量低温环境下的源时可能会出现一些特殊的问题，因为连接低温条件下的被测样品和电压表时常常要使用一些导热系数比铜低的金属，例如铁等。这样就会在电路中引入不同种类的金属材料。

The nonlinear equation of heat conduction is transformed into a Laplace′s equation by applying the Kirchhoff transformation ,and an analytic approximate solution of the equation is derived.

当介质的导热系数是温度的函数时，热传导方程是非线性偏微分方程，作者采用基尔霍夫变换把它变成拉普拉斯方程，于是可以找到原问题的近似解析解。

Thermal stress calculation in ice cover is a nonlinear problem, this includes edgeconditions nonlinearity, ice specific heat and conductivity nonlinearity, and ice elasticmodulus and linear thermal expansivity nonlinearity.

冰层温度应力问题是非线性问题，包括边界非线性、冰的比热C和导热系数K的非线性、冰弹性模量和热膨胀系数的非线性等。

It shows that theoretical calculation is almost in agreement with the experimental results. Its relative error is smaller than 18%.

通过对耐火纤维材料导热系数的计算结果和实验测定值的比较，两者基本一致，其相对误差小于 18％。

The measurement of thermal conductivity for low temperature frozen soil is important in researching the heat physical characteristics and the frost heaving of soil.

冻土导热系数的测定对于研究冻土热物理性质、土体冻胀特性有着重要作用。

On the other hand, gas content by volume is a dominant factor that affects the thermal conductivity of deep permafrost and ground ice.

对于深部强全风化泥岩，气体体积含量控制着它的导热系数的大小。

Thus the heat - exchange effect can be enhanced and the manufacture cost of equipment can be reduced.

较好解决了2种热交换介质因导热系数不同而导致的热交换不平衡和设备体积庞大、消耗钢材偏高的问题，从而有效地提高了换热器的换热效果，降低了设备的制造成本。

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％。