柯木,(学名:Lithocarpus glaber),壳斗科,乔木,高达15米;小枝密生灰黄色绒叶椭圆形或椭圆状卵形,长6—12厘米,宽2.5—4厘米,顶端渐尖,基部楔形,全缘,少数近顶端有几个锯齿,表面深绿色,背面略带灰白色,侧脉6—10对;叶柄长1—1.5厘米。分布沿江、江苏、安徽、江西、福建和广东等省区。是一种防火树种。
该资料摘自《柯林斯良木手册》。
This material has been extracted from "Collins Good Wood Handbook."
本文讨论受到多频率约束的铁木森柯梁和尤拉梁的最小重量设计问题。
The present paper discusses the minimum weight design problem for Timoshenko and Euler beams subjected to multifrequency constraints.
由于这类轴具有较小的长径比,因此,在分析它的振动时,采用铁木辛柯梁理论比欧拉梁理论更为合适。
Because of the smaller ratio of slenderness, the theory of Timoshenko beam is more suitable than Bernoulli-Euler beam's for analysis of the dynamic behavior of stepped shaft.
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