The ordinary linear regression was used to simulate the parameters variation, so as to develop diameter dynamic model. This model can be used to predict the diameter distribution and basal area in 10 years.
本研究使用回归方法模拟负指数的参数变化,得到了直径结构的预测模型,该模型可以用来预测10年内的直径结构和断面积结构。
参考来源 - 长白山云冷杉混交林生长模型的研究Characteristics of air curtain were tested and analyzed through changing cross sectional area of test tunnel, fixing angle of fan’s vane, power of fan and so on in the lab. The optimum technical parameters of air curtain were obtained.4.
3.在实验室通过改变试验巷道的断面积、风机的叶片安装角、风机的功率等对空气幕的特性进行试验研究与分析,确定最佳空气幕设计参数。
参考来源 - 矿用空气幕理论及其应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
计算每个椎间隙处的硬膜囊横断面积。
Thecal sac cross-sectional area was calculated at each disc space.
吸入管路截面积必须大于或等于泵流道断面积。
The sectional area of the suction pipeline is no less than pump flowing channel's.
断面积生长预估是林分生长和收获预估体系中的核心因子和基础。
The basal growth prediction is a kernel factor and foundation in the model system of stand growth and yield prediction.
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