查询词典 cubic

This paper studies a class of cubic system with planar polynomial.We use the qualitative theory of ordinary differential equations method of analysis, reached the following conclusions of four parts: First, we analyze the quality of all critical points of the system,and draw the conditions of existence of singular integrals for the system , in front based on the analysis, using Pioncare form series method to calculate the focal value of o(0,0). Finally, we also study the behavior of critical points at infinity.

中文摘要：本文研究了一类平面三次多项式系统，我们采用常微分方程的定性理论的分析方法，得出如下四个部分结论：第一部分，分析系统所有奇点的性态，并得出系统存在奇异积分直线的条件；在前面分析的基础上，用Pioncare形式级数法，计算出了系统在奇点o(0，0)的三个焦点量；最后，研究了系统无穷远奇点的性态。

Furthermore, by constructing an expanding algebraic system, the integrable couplings system of the Cubic Volterra lattice hierarchy is worked out.

最后，通过扩展代数系统X得出了立方Volterra格方程族的可积耦合体系。

It is shown that ZnS nanoparticles is of cubic system, zinc-blende structure.

ZnS纳米微粒具有立方面心结构，为闪锌矿型ZnS。

Ag-doped nano-BaTiO3 powder has better uniformity and dispersibility prerovskite-type structure of cubic system.

所得掺杂Ag纳米BaTiO3粉末具有良好的均匀性和分散性，仍能保持BaTiO3的立方晶系钙钛矿型结构。

Limit cycle flutter of a two-dimensional airfoil in cubic nonlinear aeroelastic system in incompressible flow is investigated.

引 言 在不可压缩流中的二元机翼是一个典型的自激振动的例子，在该系统中引入非线性项一般会产生如Hopf分岔，极限环颤振[1]，周期倍化及混沌等现象。

The integrability conditions and coefficient conditions for the appearance of 5 and 6 limit cycles from the neighborhood of the equator are obtained. An example of cubic system with 6 limit cycles bifurcating from the equator is given for the first time.

同时计算出系统的前6个赤道环量，得到了系统在赤道邻域的可积性条件及在赤道附近分支出5个和6个极限环的系数条件，从而首次给出了一个平面三次系统在赤道附近分支出6个极限环的计算实例。

The article mainly introduced 30,000 cubic meter oil tank system designs, main spare part design and ANSYS analysis. It mainly includes: floating roof tank development summary, structural design explanation, main spare part design calculation, ANSYS analysis explanation and so on.

本次设计主要介绍了三万立方米油罐的总体设计，主要零部件的设计和主要零部件的有限元分析，主要包括：浮顶油罐的发展综述，结构设计说明主要零部件的设计计算和有限元分析说明等。

Firstly, we studied the effects of synthetic temperatures on AgSbPb18Te20 samples in specific pressure. The XRD results indicate that AgSbPb18Te20 can be synthesized at more than and equal to 1120℃ and synthesized AgSbPb18Te20 samples are belong to cubic system.

结合指标化程序给出的晶格参数和我们实验测定的密度，我们认为我们所合成的样品是固溶体，然后又对样品三的原始XRD谱，利用Material Studio中的Reflex模块中的Reflex Solve对其进行了结构求解，得到其最好的结构为符合空间群为FM-3M的结构（如图4.9）。

And that they'd need a container capable of holding a cubic yard to hold them!

他们需要用一个一立方码大小的容器才能装得下这些钱币！

It is amazing that we totally dumped 6 cubic yard bark and it took us about 1.5 months tofinish that.

我们总共买了6立方米的树皮，花了1个半月才干完。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。