The low density graphite gets higher friction coefficient and bulk worn loss than the high density graphite.
低密度石墨的摩擦系数和体积磨损量比高密度石墨材料高。
On the assumption that the product of volume thermal expansivity and bulk modulus based on the thermodynamic approximation theory, a new equation is presented for volume thermal expansion coefficient.
根据热力学近似理论，在对体积热膨胀系数和体积弹性模量的乘积进行假设的基础上推导了一个体积热膨胀系数与体积和温度间的关系式。
The hydroscopic expansion coefficient of grains is an important physical parameter for prediction of bulk densities and study of internal stresses of grain kernel during adsorption and desorption.
湿膨胀系数用于预报谷物堆密度和研究谷粒应力裂纹产生原因等研究。
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