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导热系数

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主要产品有:回弹仪、导热系数测定仪、渗透仪、收缩膨胀仪、手持应变仪、防水材料检测仪、低温弯折仪、渣球含量分离器、热荷重试验仪、燃烧性能试验炉、各种测厚仪、石墨电极热膨胀仪、煤强度测定仪、电动击实仪、憎水性测试仪、矿棉容重测定仪、混凝土钻孔取样机、锯切机、磨平机、套丝切管机、液压弯管机、不透水试验仪、耐热性测定具、加热伸缩测定器、延伸仪、针入度仪、细度计、粘度计、干燥时间试验器、铅笔硬度计、摆式硬度计、附着力测试仪、漆膜划格器、耐洗刷测定仪、耐溶剂测定仪、耐磨仪、平磨仪、涂层落砂耐磨仪、耐沾污测试仪、冲击试验仪、穿孔仪、漆膜弯曲仪、涂膜涂布器、砂磨机、锥形磨、高速分散机、三滚研磨机、划痕试验仪、压痕试验仪、光泽仪、白度仪、鲜映性仪、反射率仪、铁钴比色计、涂料密度杯、抗裂性试验仪、流平仪、流挂仪、目视比色箱、最低成磨温度测定仪、低温脆性试验仪、目视比色箱、电子拉力机、门尼粘度仪、硫化仪、直读比重计、压缩耐寒试验仪、文物耐磨仪、文物划痕仪、摩擦系数测定仪、涂层检测划格板、涂层耐燃烧试验仪等多种试验仪器。

Temperature distributions of the diode cathode of W and Mo are calculated by finite diffe- rence under different conditions.

采用数值方法计算了常用基底W、Mo阴极金属丝在不同条件下的温度分布,同时首次给出了这两种材料在宽温区内导热系数、辐射系数的计算公式。

With increase of the temperature,the specific heat capacity of composites was increased,the thermal diffusivity and the the...

随着增强体SiC体积分数的增大,复合材料的热容线性下降,热扩散系数和导热系数均非线性减小。

Thermal diffusilivity, thermal conductivity,and specific heat capacity of tire tread rubber filled with different carbon black or amount were studied.

研究了炭黑品种和用量对轮胎胎面胶热扩散系数、导热系数及比热容3种热物性参数的影响规律。

And we mention the relationship between the four parameters and temperature in order to show the relationship between its change and stress. In the second place, with making use of the little distortion elasticity theory and diathermanous theory, the method that we study the heat stress , force stress and combined stress in the forging process is educed. And then we will find out the relationship between the four parameters and combinedstress of the forging die.

文中首先分别说明弹性模量、线膨胀系数、导热系数和比热容的定义,并且引出这四个物理性能参数与温度的关系即它们随温度变化的规律,为进一步说明模锻过程中这四个物理性能参数随温度发生变化是如何影响锻模应力场提供了理论依据。

The effects of microburner dimensions, heat conductivity and thickness of wall, external heat losses and wall roughness on com-bustion characteristics were studied.

模拟结果显示,燃烧器内径的变化、壁面导热系数、对流换热系数和壁面厚度的变化影响了热量在壁面内的传递和流体内径向温度的传递,使得燃料点燃和燃烧稳定性受到影响,甚至导致燃烧停止。

The results show that comprehensive technical indexes of the structure made of foamed polyethylene board were good.

结果表明,便携式微型保鲜冷库的最佳制冷设备工作时间系数为 0 。2 4 ,对照 0 。32 ,库体导热系数为 0 。95 ,对照 1.0 0。

Bull; Ultra-low thermal conductivity and heat transfer coefficient, can effectively prevent the heat conduction

bull;超低的导热系数和传热系数,能有效地阻止热量的传导

Experimental data of critical parameters, and the correlations of saturated liquid and vapor density, enthalpy of vaporization, vapor pressure, pVT properties, second virial coefficient, ideal-gas heat capacity, surface tension, viscosity and thermal conductivity are obtained in this paper.

介绍了三氟碘甲烷(CF3I)热物理性质的研究成果,包括临界参数的实验数据以及饱和气液密度、饱和蒸气压、汽化潜热、 pVT性质、第二virial系数、理想气体比热容、表面张力、粘度、导热系数等的关联式,并与文献数据进行了比较,分析了实验数据对关联式的偏差。

First of all, the factors which influence the thermal barrier effect and the relationship between the factors and heat resistance were analyzed. Then, the paper gave the mathematical model of the effect of thermal conductivity, coating thickness, environment temperature difference, and heat exchange coefficient on thermal barrier effect.

研究主要内容如下:本文首先分析了隔热效果的几种影响因素以及它们与隔热效果之间的关系,推导出了包含热障涂层厚度、导热系数、环境温差和对流系数等在内的影响因素与隔热效果之间的数学模型。

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The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作:对伸臂位于顶部的单层框架—筒体模型进行分析,提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。

Its advantage is that it can be used in smaller units.

其优点在于可以在较小的单位中应用。