The formulation, the technological conditions and the product properties of polyurethane materials for low density long fiber injection (LFI) process were studied.
对低密度长玻璃纤维注射工艺(LFI)用聚氨酯材料的配方、工艺条件和制品性能进行了研究。
As the foundation of the sampling density theory, the factor model of sampling density could guide the formulation of sampling density and sampling layout in geochemical mineral exploration.
采样密度因素模型是采样密度理论的基础，可以指导矿产地球化学调查采样密度和采样布局的制定。
If probability density functions of stress and strength are definite, stress strength interference model can be used to calculate reliability using formulation or numerical value integration.
应力、强度概率密度函数确定可采用应力-强度干涉模型，用公式或数值积分求可靠度。
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