Results finally theoretically it concludes the rule that the change of the coefficient of thermal conductivity of the solid ' s surface follows the change of the temperature 结果理论推导出与实验事实相符的晶体表面导热系数随温度的变化规律。
The paper introduces the fundamentals of the temperature distribution in the borehole drilled in the frozen formation , and discusses the ascertainment of these parameters , including the mass quantity of circulation medium , the coefficient of thermal conductivity of drilling rods , the coefficient of the intensity of heat exchange and the coefficient of unstable heat exchange between the rock and the circulation medium , and the rising of the temperature of the circulation medium in the bottom of the bore 摘要介绍了冻土钻孔内温度分布研究的理论基础,其中主要讨论了冲洗介质的质量流量、钻杆杆壁的导热系数、岩石同冲洗介质的热交换强度系数与不稳定热交换系数,以及孔底冲洗介质温度升高值的确定。
Due to its intrinsic merits , such as wide band gap , high electron saturated drift velocity , high melting point , good coefficient of thermal conductivity , anti - radiation and good chemical stability , gallium nitride as a direct band gap semiconductor has become the promising material for the application of short - wave light - emitting devices and high temperature , high frequency and high power electronic devices Gan是直接带隙半导体材料,以其禁带宽度大、电子饱和漂移速度大、熔点高、热导率高、抗辐射能力强和化学稳定性好等优点成为制造短波长光发射器件及高温、高频、大功率电子器件的理想材料。