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The analytic method,existence,stability and bifurcation of general stronglynonlinear nonautonomous system and parametrically excited system with peri-odic coefficient are studied in this thesis.

本文主要研究一般的强非线性非自治系统和周期参数激励系统的解析方法，周期解的存在性、稳定性及其分叉。

When discussing the bifurcation of subharmonics orbits, many papers need a samilar assumption of the monotonicity of periodic orbits near the homoclinic orbit.

进一步，给出了同宿轨与周期轨关于小参数函数是连续依赖的。

Due to conducted or radiated EMI from inner or outer coupling circuits,breathing can exist in current-mode controlled Boost converter.It exhibits as a time-bifurcation undergoing regular period-1,subharmonics and chaos orderly and repeatedly for a long period.

本文揭示了在电流模式控制Boost变换器中，由于存在内部或外部耦合电路引起的传导和辐射干扰，使得有可能产生呼吸现象，这是一种以较长的周期按顺序交替历经规则、分谐波和混沌状态的时间分叉现象，在功率变换电路中是一种非正常的工作状态。

The bifurcation equation of time delays dynamic system is deduced by the method of multiple scales.

建立了具有时变刚度、非线性阻尼和谐波激励的一类相对转动时滞非线性动力系统的动力学方程。

Finally,the buckling,bifurcation and stability of the Timoshenko beam is analyzed near the critical load through numerical calculation.

通过数值计算，分析了弹性Timoshenko梁在临界载荷处的屈曲和分叉以及稳定性，并与理论值进行了比较。

A bifurcation of the Japan Current carries warmth and moisture to the Alaska coastline.

日本海流的一个分支将温暖和湿气带到了阿拉斯加海岸。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。