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极限化

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Both single and double-stable limit cycle flutter states are found in wind-tunnel test. And the conclusion is proofed that the equivalent linearization based on the second order asymptotic solution of KBM method is more accurate than that based on the first order one, which is equivalent to the conventional harmonic balance method.

风洞实验时,吹出了单、双稳定极限环颤振情形,并验证了基于KBM二次渐近解的当量线化分析比KBM法一次渐近解的当量线化分析要精确一些的结论。

We firstly discuss minimal sets characterizations of closed-set lattice , then systematically study the categorical properties of categories CL and PairCL by the means of the join-semilattices closed-set-latticefies, and the constructions of monomorphism, epimor-phism, extremal monomorphism, extremal epimorphism, section, retraction, subob-ject, quotient object, product, co-product, equalizer, coequalizer, inverse limits and direct limits in the categories CL and PairCL are given.

首先讨论了闭集格的极小集刻划,然后通过并半格的闭集格化这种方法,较为系统地研究了范畴CL及范畴PairCL的性质,给出了范畴CL和范畴PairCL的单态射、满态射、极端单态射、极端满态射、截节、收缩、子对象、商对象、极端子对象、极端商对象等特殊态射和特殊对象的具体刻划,并且研究了它们的等化子和余等化子、乘积和余积、逆极限和定向极限的具体构造。

We firstly discuss minimal sets characterizations of closed-set lattice , then systematically study the categorical properties of categories CL and PairCL by the means of the join-semilattice's closed-set-latticefies, and the constructions of monomorphism, epimor-phism, extremal monomorphism, extremal epimorphism, section, retraction, subob-ject, quotient object, product, co-product, equalizer, coequalizer, inverse limits and direct limits in the categories CL and PairCL are given.

首先讨论了闭集格的极小集刻划,然后通过并半格的闭集格化这种方法,较为系统地研究了范畴CL及范畴PairCL的性质,给出了范畴CL和范畴PairCL的单态射、满态射、极端单态射、极端满态射、截节、收缩、子对象、商对象、极端子对象、极端商对象等特殊态射和特殊对象的具体刻划,并且研究了它们的等化子和余等化子、乘积和余积、逆极限和定向极限的具体构造。

The mathematical programming formulation and related solution procedure are established by the traditional BEM. Through the discretization of space and time, the elastoplastic stress simulation method and reduce-basis technique are adopted to construct the self-equilibrium stress field. The numbers of variables and constraint equations in the resulting mathematical programming formulation are reduced greatly and then the dimension obstacle of computation in 3-D limit and shakedown analysis is overcome.

采用常规边界元方法建立了三维结构极限与安定分析的数学规划格式,通过对时间和空间的离散化,并采用弹塑性模拟法构造自平衡应力场和引入减缩基技术,大大减少了所形成的数学规划格式中的未知变量和约束方程的数目,有效地克服了三维结构极限与安定分析中的维数障碍问题。

The fundamental compute region B is determined and self-similarly mapped into the upper half plane by using the homeomorphic affine transformationθ, so the fractal images of the upper half plane, square limit, and circle limit can be constructed.

周期化动力平面或参数平面,确定基本计算区域,应用同胚仿射变换将基本计算区域自相似地映射到上半平面,进而构造方极限和圆极限分形图。

System is used VB6.0, MATLAB6.5 and MATLAB and Visual Basic OLE interface methods of production, use VB Visual Interface, the real object-oriented, event-driven approach using the structure of high-level programming language, the perfect tool Integrated production and friendly interface and features of MATLAB numerical terms, such as a strong graphic image processing function for the core to achieve the limit, derivative, differential, integral and indefinite integral, vector algebra and analytic geometry of space for the function will be Two aspects of the unique advantages of combining the strong points, to shorten the development cycle and reduce programming difficulty, the current rapidly changing information age is of high practical value.

在线等汉-英翻译,网上在线翻译的别回!!!!!系统是采用VB6.0、MATLAB6.5 和MATLAB与Visual Basic接口OLE方法制作的,利用VB界面的可视化、真正面向对象、采用事件驱动方式的结构化高级程序设计语言、工具的完美集成和友好性特点制作界面和MATLAB的数值计算、图形图像等强大的处理功能为内核来实现函数极限、导数、微分、定积分和不定积分、空间解析几何和向量代数的求解功能;将两方面具有的独特优势结合起来,取长补短,以缩短开发周期,降低编程难度,这对当前日新月异的信息时代是具有很高的实用价值。

Combining with the National Natural Science Foundation ofChina(No.50478032), following researches were done in this thesis: 1 The variation regularity of the ultimate anti-bending capacity of therectangular-sectioned beam with different corrosion has been obtained through thequalitative analysis of 48 beams (32 corroded beams and 12 comparing beams) withaccelerated corrosion; 2 The conclusion has been obtained that the strain of corroded steel bar andconcrete no longer fit in with the assumption of plane section through the analysis ofthe strain data, the strain relation of steel bar and concrete in the mid-span section ofvariously corroded beams at ultimate has been obtained. Through the building of newgeometric relation, the expression of the height of compressive area in the corrodedbeam with rectangular section has been deduced, and the formula with corrosion rateas the main variable for the anti-bending capacity of the corroded concrete beam hasbeen suggested and verified by experiment.; 3 The influence of steel bar corrosion and the concrete regression to the flexureductility coefficient of the corroded structure component has been analyzed. Based onthe relation of steel bar and concrete at yield and ultimate, the expression for theflexure at yield and ultimate of corroded reinforced concrete beam, and the model forthe calculation of the flexure ductility has been built.

本文结合国家自然科学基金项目(50478032)"既有钢筋混凝土桥梁时变可靠度研究",主要进行了以下研究工作: 1通过对48根快速锈蚀钢筋混凝土矩形截面梁(32根锈蚀梁和12根对比试验梁)数据的定性分析,得到了不同锈蚀率下,锈蚀钢筋混凝土矩形截面梁极限抗弯承载力的变化规律; 2通过对应变数据的分析,论证了锈蚀构件钢筋和混凝土的应变不再符合平截面假定的结论,并通过回归分析得出了不同锈蚀率的螺纹钢筋梁和光圆钢筋梁在极限弯矩作用下,跨中截面处钢筋应变和钢筋处混凝土应变的关系,通过构造新的几何关系,得出了锈蚀钢筋混凝土矩形截面梁计算受压区高度的表达式,既而得出了以锈蚀率为主要变量的锈蚀钢筋混凝土矩形截面梁的正截面抗弯计算建议公式,并通过试验数据加以验证; 3分析了钢筋锈蚀和混凝土劣化对锈蚀构件曲率延性系数的影响,结合钢筋屈服和极限弯矩两种状态下钢筋和混凝土的应变关系,分别得到了锈蚀钢筋混凝土矩形截面梁屈服曲率和极限曲率的计算表达式;既而推导出曲率延性系数的计算模型。

The results of numerical analysis show that the elastic modular and the poisson ratio have no effect on two-dimensional bearing capacity, but can affect the ultimate bearing capacity of three-dimensional foundations and control the convergence and precision of finite element calculation; the earth pressure coefficient controls the geostatic stress of foundation, sequentially affects the ultimate bearing capacity of foundations and the convergence of numerical calculation. When calculating the ultimate bearing capacity of undrained saturated foundation, the complete formulation exists shear locking, and reduce formulation exists hourglassing, so the hybrid formulation is suitable to imitate the geomaterial. When the soil obeys nonrelevent flow rule, the yielding function is different from potential function, and the elastic-plastic matrix of soil is asymmetric, so the unsymmetry numerical solver and appropriate finite element mesh is required.

研究结果表明,土体弹性模量和泊松比对二维基础极限承载力没有影响,但是影响着三维矩形基础的极限承载力,控制着ABAQUS数值算法的计算精度与收敛速度;地基土压力系数控制着地基土体中的地应力平衡,从而影响着二维条形基础和三维矩形基础的极限承载力和地基破坏包络面;对于不排水饱和软黏土地基,常规的完全积分单元会造成剪力自锁现象,而减缩积分单元则存在过于柔化的现象,故采用杂交单元来模拟较合适;当土体服从非关联流动法则时,屈服函数与塑性势函数之间存在差异,从而导致土体弹塑性矩阵呈现非对称性,在有限元计算中必须采用非对称数值解法,并且合理地划分单元才能对极限承载力进行准确求解。

Thus jouissance indicates mutual transformation: on the one hand, death is eroticized; on the other, eros is brought to the extreme and maximized.

绝爽意味著相互的转化:让死亡被爱欲化,以及让爱欲被极限化与极大化。

A computer simulation based on strong-weak model shows good agreement with the linear theory. The linear theory of the ion trapping instability caused by ions in equilibrium is also introduced in this paper.

包括不稳定性的增长率与中性化系数的关系、阈值与中性化系数的关系、束流的相干频率漂移和展宽、离子在空间的分布和尺寸、离子动态丢失的机制以及离子在储存环内积累的极限。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。