导热系数

Finite element analysis is used to compare temperature differences between low and high thermal conductivity of composites.

利用有限元方法对电子封装倒装焊中不同导热系数的底充胶材料对温度场的影响进行了分析比较。

A method of measuring the materials thermal conductivity is proposed, through optimal approach of the measurement of the surface temperature with the analytical solution to calculate the materials thermal conductivity in the third boundary condition.

提出了一种根据第三类边界条件下物体瞬态温度场的变化规律，利用物体表面温度的实测值推算物体导热系数的快速测定方法。

Effective heat capacity method was used to simulate heat transfer of freezing phase change growth in the metallic foams at the third boundary condition. The average temperature distributions vs. time in the metallic foams were obtained. The results showed effects of different porosity and thermal conductivity on the temperature distributions.

采用显热容法模拟了第三类边界条件下泡沫金属中水的冻结相变传热过程，得到了泡沫金属中骨架和流体的温度分布及其平均温度的变化，分析了不同骨架导热系数及不同孔隙率对介质温度分布的影响。

By means of"random distribution model"proposed by Woodside, the calculation model of the effective thermal conductivity of Ni catalyst under reactions has been established

以Woodside随机分布模型，建立了反应条件下催化剂有效导热系数的计算模型为

By introducing the mixing rule, only molecular weight and acentric factor and critic parameters of each components are required as input.

该模型通过引入混合规则，仅需输入混合工质各组分的分子量、偏心因子和临界参数即可预测混合工质的粘度和导热系数。

Tall heat preservation is light the wallboard outside pledging with local farming, forestry discards the wood fibre such as straw, wheat straw, straw, sawdust is raw material, coefficient of thermal conductivity is less than 0.38, it is our country is in a technology at present of banner level outside wall insulation material, structural thermal resistance is as high as 2.55, thermal resistance effect is equivalent to thick the wall of bricky build by laying bricks or stones that amounts to 1.2 meters, country of energy-saving standard prep above is energy-saving 60% index.

高保温轻质外墙板以当地农、林业废弃秸秆、麦秸、稻草、锯末等木质纤维为原料，导热系数小于0.38，是我国目前处于技术领先水平的外墙保温材料，结构热阻高达2.55，热阻效果相当于厚达1.2米的砖砌墙，节能标准高于国家节能60%指标。

It has been shown that the theoretical calculative formula, which is based on fractal description, has higher precision.

这表明了基于分形理论描述的耐火纤维材料有效导热系数的计算式具有较高的表达精度。

The evaluation indexes, which sign the testing results, are put forward, the indices include the difference of calefactive ratio, the heat insulation ratio, effective thermal conductivity, compound thermal resistance and response time.

二、提出了本文所研制的测试装置测试结果的评价指标，具体指标为升温速率差、织物试样的隔热率、名义导热系数和复合热阻及温度动态响应时间。

These indexes describe the fabric's thermal properties during the heated process. The heat insulation ratio preferably manifests fabric's insulation property; the difference of calefactive ratio describes dynamic conditions average calefactive case; effective thermal conductivity and compound thermal resistance are mainly considering the wholly testing characteristics and describing the compound thermal property; the response time expresses the time of step response during dynamic testing process. 3. Dynamic heat transmitting properties of fabrics and warmth retention testing methods have been developed; many different textile materials are used for actual test, and the data are analyzed, illustrated, and compared.

这些指标从不同的侧面描述了试验过程中织物试样的传热隔热性能，其中隔热率是从整体上来考虑的指标，它较好的描述了试样的隔热保温性能；升温速率差考虑的是动态变化过程中平均升温变化情况，它的大小表现了织物热性能的差异；名义导热系数和复合热阻是从试验装置的特点出发整体来考虑的热传递指标，描述了铜板、试样、铜板三者复合时的传热性能与隔热性能；而温度动态响应时间表示动态热传递过程中趋于稳态所经历的时间。

These indexes describe the fabric"s thermal properties during the heated process. The heat insulation ratio preferably manifests fabric"s insulation property; the difference of calefactive ratio describes dynamic conditions average calefactive case; effective thermal conductivity and compound thermal resistance are mainly considering the wholly testing characteristics and describing the compound thermal property; the response time expresses the time of step response duringdynamic testing process.3. Dynamic heat transmitting properties of fabrics and warmth retention testing methods have been developed; many different textile materials are used for actual test, and the data are analyzed, illustrated, and compared.

这些指标从不同的侧面描述了试验过程中织物试样的传热隔热性能，其中隔热率是从整体上来考虑的指标，它较好的描述了试样的隔热保温性能；升温速率差考虑的是动态变化过程中平均升温变化情况，它的大小表现了织物热性能的差异；名义导热系数和复合热阻是从试验装置的特点出发整体来考虑的热传递指标，描述了铜板、试样、铜板三者复合时的传热性能与隔热性能；而温度动态响应时间表示动态热传递过程中趋于稳态所经历的时间。

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％。