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The nonlinear dynamic equations including the initial geometric imperfections of laminated composite cylindrical shells were derived from Hamilton's philosophy. Assuming the transverse displacements to be composed of axially symmetrical part and axially asymmetrical part, the governing equations expressed as displacement forms of dynamic buckling were obtained by Galerkin method. The equations were solved by finite difference method. The effects of impact velocity, lamination angle, initial geometric imperfection on the axial dynamic buckling of laminated composite cylindrical shells were discussed.

由Hamilton原理导出包含初始几何缺陷的复合材料层合圆柱壳的非线性动力方程；将横向位移设为对称及非对称两部分，由Galerkin方法得到以位移形式表达的动力屈曲控制方程，通过有限差分方法求解；讨论了冲击速度、铺层角度、初始几何缺陷等各种因素对复合材料圆柱壳轴向冲击动力屈曲可能产生的影响。

Evidence for the Gallican rites of ordination and some other matters is derived from this book.

证据高卢圣仪式的协调和一些其他事项源自这本书。

The gametophyte is derived from the product of a reduction division in the megaspore mother cell.

该配子体是由大孢子母细胞进行减数分裂而来。

However the major portion of the initial gamma radiation is derived from the two latter sources.

可是绝大部分早期γ辐射来自后两种来源。

Firstly, the gaseous turbulence statistics of single phase flow, derived from PIV data, were compared with documented DNS results, and it demonstrated the feasibility of turbulence measurement using PIV technology.

本文首先比较了采用传统PIV算法测量的单相湍流统计量与文献中直接数值模拟的结果，证明了PIV测量流场湍流量的可行性。

PCBs at the beginning of the land fill were mainly composed of the 3-Cl and 5-Cl compounds. In the late of the land fill, 2-Cl compounds increased significantly. The main factor affecting the PAHs, PCBs contents were microbial degradation and transformation. Analysis of the pollutants source s indicated that PAHs in sludge were mainly derived from the waste water of refinery, coking plant, gasworks, smelt plant and pitch plant.

填埋初期污泥中PCBs主要以3-Cl和5-Cl化合物为主，填埋后期，2-Cl化合物大大增加，占总的PCBs含量的大部分影响PAHs、PCBs含量变化的主要因素是生物对PAHS的降解转化根据污泥中各污染物的含量对污染物进行源解析表明，污泥中PAHs主要来源于炼油厂、炼焦厂、煤气厂、冶炼厂和沥青厂等排放的废水。

One undercooling criterion of equi-nucleation is derived from analysis of Gaussian distribution model of heterogeneous nucleation.

通过对高斯异质形核公式的研究，给出了等轴晶开始形核的过冷度判据，更为准确的描述柱状晶向等轴晶的转变过程。

Handheld Geiger counter by Cold Spring Biotech Co., Ltd. Shanghai Office agent or sales of SE brand of equipment, products derived from the SE.

掌上型盖革计数器是由冷泉港生物科技有限公司上海办事处代理或销售的SE品牌的仪器，产品来源于SE。

DHA supplements derived from algae and encased in non gelatine capsules are now available.

DHA的补充来自藻类和装在非明胶胶囊，现已。

Q: Agar is a gelatinous substance derived from what?

石花菜是从哪来的凝胶物质？

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。