球壳

Based on the covering-domain method, an expression for calculating the interior scattering sound field of an arbitrary-shaped closed thin shell in which there are some scatterers.

复杂形状；散射声场；散射体；封闭薄球壳；基于覆盖域的思想和方法，本文给出了复杂形状封闭薄壳在内部存在散射体时的内部散射声场计算表达式。

In the case of 16 boundaries, cubic B-spline function taken as trial function, the solutions to nonlinear stability of truncated conical shells and spherical shells with variable thickness were obtained by the method of point collocation.

在16种边界条件下，以三次B样条函数为试函数，用配点法计算变厚度开顶圆锥壳和球壳的非线性稳定。

By the use of the obtained relationship between reflectively and frequency, the effects of thickness, material coefficients and viscoelastic damping of outer shell on the scattering characteristics of the structure were calculated and analyzed.

利用已得到的散射率函数，计算并分析了外层壳的厚度、材料常数、粘性阻尼等对双层球壳散射特徵的影响。

The interface stability of the spherical shell geometry is better than that of the cylinder

球壳会聚结构比柱壳会聚结构的界面稳定性要好些。

It is well known that problems of vibrations of spherically isotropic(a special form of transversely isotropic)spherical shells are moredifficult to deal with than those of the isotropic ones.

由于包含五个弹性常数，球面各向同性(属横观各向同性的一种特殊形式)球壳振动的研究要比各向同性球壳振动的研究复杂。

With the improvement in football making art, the football made of 8 or 12pieces of tegument appeared. Bladders of animals took the place of furs and hair and were filled inside the Cuju". Huff to make air-filled ball". This is the first invention of the world .

随着制球艺术的提高，出现了八片和十二片缝制的球，把在球壳内塞入毛发改为了放一个动物的膀胱，"嘘气闭而吹之"成为世界上最早充气的球，这在世界上也是最早的发明。

The pathogen was confirmed to belongs to Septoria, Deuteromycetes,Sphaeropsidales, Sphaeropsidales according to《Configuration and taxology of fungus》and《Chinese fungus》.

根据《真菌的形态和分类》和《中国真菌志》，确定分离的病原菌为壳针孢属，属于半知菌亚门球壳孢目球壳孢科。

Inner surface images of PS and PAMS micro-shells were obtained with PSI method.The results are consistent with the measured results by atomic force microscope.The measurement error is analyzed by studying the influence of thickness fluctuation of micro-she...

以微球壳层对超光滑碳化硅及单晶硅片表面形貌的调制作用为研究对象，讨论了微球的外表面粗糙度以及微球壁厚对内表面粗糙度测量结果的影响，确定了相移干涉法测量微球内表面粗糙度的不确定度，实验结果表明：对于表面粗糙度小于30 nm、厚度小于9μm的微球，测量不确定度小于0.4 nm。

Two types of coupling vibration problems are considered in thispaper,i.e.those of spherical shells coupling with fluid and ehstic mediumIn particular,for elastic medium,we adopt the basic assumptionsemployed in the Pasternak model of elastic foundation and include theeffect of the foundation's thickness,however,to re-derive the relationshipbetween the pressure and deformation by the principal of minimumpotential energy.

文中考虑了两类耦合振动问题，即球壳与流体和球壳与弹性介质的耦合振动。特别对于弹性介质，采用工程上常用的Pasternak假设但考虑了简化模型中弹性层厚度的影响，利用能量方法重新推导了该模型的压力——变形关系。

As the ball absorbs the lane oil as it travels down the lane and in between shots, the ball's surface remains in a "dry" state.

一般来说，球壳会吸去在每次出手后，球与球道间的油层，让球的表面尽量维持在&乾燥&的状态。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。