这些都是固定效应模型和横截面模型。
运用个体时点固定效应的面板数据模型，构建比横截面数据模型更为真实的行为方程，并与传统的区位因素进行比较分析。
Also, the paper use an individual-time fixed panel data model to build a more real acts equation than the cross section data model, and compare with traditional factors.
横截面固定模型？
标距长度和试样在直径减少处的横截面面积之间有固定的关系。
There is a fixed relationship between the gauge length and the cross-sectional area of the test-piece at the reduced diameter.
刚性板结构由中间相连的中心腹板和固定桥梁横截面形状的外部边缘支撑系统组成。
The rigid plate construction consists of the central webs of the bridge meeting in the middle and a peripheral edge support that holds the cross-sectional shape of the bridge.
得出了一种固定孔隙的制样方法，用此制样方法可观察到滤毡截面的真实形貌，从而有效地分析滤毡中粗细纤维的配比和各层的孔隙率。
The method of sample preparation by pore fixing was described. The results showed that it was a good method for studying irregular porous structure and the related ratio of felt.
得出了一种固定孔隙的制样方法，用此制样方法可观察到滤毡截面的真实形貌，从而有效地分析滤毡中粗细纤维的配比和各层的孔隙率。
The method of sample preparation by pore fixing was described. The results showed that it was a good method for studying irregular porous structure and the related ratio of felt.
应用推荐