屈曲的

Such a transition is known as buckling of the structure.

这样一种过渡称为结构的屈曲。

When the Hamiltonian system is introduced into the research of dynamic buckling in cylindrical shells, the problem uses dual variables in Symplectic space instead of variables in traditional Euclidean space. The symplectic eigenfunction expansion method gives out an exact solution space. So many problems are solved, which can not find the solution in traditional methods.

将哈密顿体系引入结构的动态屈曲研究中，其意义在于将结构的动态屈曲研究从传统的欧几里得几何空间进入到由原变量和对偶变量组成的辛几何空间之中，从而使辛本征函数展开的直接解析法得以实施，这样就可以求解许多以往半逆凑合法无法求解的问题，并且所得到的解空间是完备的。

In the thesis the author analyzes the tripping of stiffened panels by three different methods. Based on the above method, the author calculates the ultimate longitudinal strength of a boxlike girder, several ships and many stiffed panels by program. And then checks with some famous experts results. The result is approving. Also the author analyses the reliability of ship considering corrosion. At last an experiment is done to verify the theory.

由于加筋板侧倾屈曲是一种非常危险的破坏形式，本文采用不同方法分析了加筋板侧倾屈曲，并作出了比较；基于上述方法运用计算机程序计算出了箱型梁和几种实船的极限承载能力以及各种加筋板单元的极限强度，并和著名学者的结果进行了比较，结果令人满意；分析了某实船的考虑腐蚀影响的可靠性指标；最后，为了验证理论的精确度，作者参与了钢箱型梁的极限强度试验，通过比较试验数据与理论数据，结果基本一致。

Clinical Relevance: The risk of injury to both the superior gluteal nerve and the gluteus medius muscle is higher with limited degrees of hip flexion and adduction, such as are possible in the supine position on a fracture table, than it is with greater degrees of hip flexion and adduction, which are possible in the lateral position on a fracture table or in the so-called sloppy lateral position on an ordinary table.

临床相关性：臀上神经和臀中肌在髋关节屈曲内收较小度数时两者都损伤的风险较高，例如仰卧于骨折手术床的可能性比侧卧于骨折手术床或者所谓的随意侧卧位卧于普通的手术床上，髋关节屈曲内收较大度数时的可能性要大。

Clinical Releance: The risk of injury to both the superior gluteal nere and the gluteus medius muscle is higher with limited degrees of hip flexion and adduction, such as are possible in the supine position on a fracture table, than it is with greater degrees of hip flexion and adduction, which are possible in the lateral position on a fracture table or in the so-called sloppy lateral position on an ordinary table.

临床相关性：臀上神经和臀中肌在髋关节屈曲内收较小度数时两者都损伤的风险较高，例如仰卧于骨折手术床的可能性比侧卧于骨折手术床或者所谓的随意侧卧位卧于普通的手术床上，髋关节屈曲内收较大度数时的可能性要大。

No significant difference were found between left and right hand weight loading for erector spinae during the trunk movements, but the values of AEMG with back weight loading were significantly higher than left and right hand weight loading;(2)The AEMG of lumbar multifidus had no significantly different under three load ways during the walking.

(1) 躯干屈曲伸展过程中，腰部多裂肌与竖脊肌各自两侧的激活程度呈现对称性特点；躯干伸展运动对腰部竖脊肌和多裂肌的激活程度大于屈曲运动；(2)腰部多裂肌在躯干旋转时激活特征存在显著的对侧增强效应；(3)腰部前屈过程中，竖脊肌和多裂肌肌肉的高激活区域可能集中在45°—65°的角度范围之内。

In the buckling question under nonconservation force,a simply example( the dynamic stability question under the uniformly follower forces with small deformation % linear elastic, straight normal.) is considered.The variational equation of braid composite cylindrical shells subjectd to uniformly follower forces is deduced based on the variation principle of quasinatural frequency of elastic nonconservative system self-excited vibration.The calculated formulas of the flutter load and quasinatural frequency of shells are obtained. The program for calculating the flutter load is developed.The numerical example is given and some useful conclusions are obtained.

对非保守力作用下的屈曲问题，具体研究了圆柱壳在比较简单的情况，即小变形、线弹性、直法线假设下在随动力作用下的壳屈曲问题，由拟固有频率变分原理推出了圆柱壳受随从力作用的变分方程，得到了颤振载荷与壳弯曲的固有频率的计算公式，编制了相应的计算机程序，并给出了具体算例，得到了一些有益的结论。

The paper reviews the development in the analytical theory of mechanical behavior of composites, pointing out the problems existed, presenting creatively the concept of yarn state, solving the descriptive problem of perform structure of any woven composites and laying the foundation for predetermining the elastic behavior of 3-d woven composites with computer. On the basis of yarn state, the relative cross section deformation theory is introduced, the yarn cross section deformation is studied, and the experiential formula is described in the paper on the basis of experiment. The crimping state of yarn is studied, the classical "straight warp view"is modified, and the crimp height value of crimped yarn is studied. At the same time, with shrinkage rate sine method, the paper proposes the idea which imitate the shape of crimped yarn. With the third power template curve, the paper describes the microgeometry structure of fabric, finding a brief and precise approach for the calculation of mechanical behavior of composites.

本文回顾了复合材料力学性能分析理论的发展，指出了存在的问题，创造性地提出了纱态概念，解决了任意结构机织复合材料预制件结构表征问题，进而为用计算机预报三维机织复合材料的弹性性能打下了基础；基于纱态概念，提出了相对截面变形理论，研究了纱线截面变形情况，在实验的基础上给出了纱线截变经验公式；研究了纱线屈曲状态，修正了传统的&地经纱直线论&，提出了以纱线缩率研究屈曲峰谷值的思想，同时以三次样条曲线拟合了纱线的卷曲形状，较好地描述了织物的细观几何结构，为复合材料力学性能的计算找到了一条既比较简便又比较精确的途径。

The program can be used to track the limit load and flex point of space structure, can take structural imperfection into consideration, gets the buckling model and vibration model of three-dimension steel structure, analyzes the elastic-plastic status or stress distributing of any intersection and any point and draws the nephogram of stress distributing, the hysteretic line subjected to cyclic load and local buckling deformation.

本软件能够跟踪分析任意空间结构中各种反弯点和极限荷载、并能够考虑结构的缺陷分布影响、求解三维空间钢结构屈曲模态和振动模态。进而分析钢构件任意截面、任意点的应力分布及塑性屈服状态，绘制截面的应力分布云图及循环荷载下的滞回曲线，绘制钢构件的局部屈曲变形图。

Equivalent imperfections are provided, which can be used directly as an eccentricity of the axial force in calculating the design moment It is permissible to construct simply a linearised version of the interaction diagram for cross-sectional resistance to combinations of axial compression and uniaxial bending moment on a composite section.

登录 |阻力的屈曲由于不完善的减少可能是取自EC3系列屈曲曲线。等效缺陷提供，它可以用来作为计算的轴向力设计的时刻直接偏心这是允许的构造简单组合截面上的一个横截面的抗轴向压缩和单轴弯矩组合交互图线性化版本。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。