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用非分散红外分析法测定废水中的含油量,已报导于文献,该法系以油类物质中的甲基、亚甲基和次甲基的C—H伸缩振动在波数2800—3000cm~(-1)范围内的红外吸收为基础,我国已将其列为废水中石油 相似文献
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考虑－受横向周期载荷作用下单轴转动的截锥扁壳，利用Melnikov方法讨论了该动力系统的同宿轨分岔，次谐分岔；并用数值方法进行模拟，研究该系统的混沌运动，从所得出的相平面图，时间历程图和庞加莱映射图业看，在一定参数组合下，该系统确实存在混沌运动。 相似文献
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In this paper, we present an analytical solution of the interaction of the nanotube （NT） with a wedge disclination dipole in nanotube-based composites. The corresponding boundary value problem is solved exactly by using complex potential functions. The explicit expression of the force exerted on disclination dipole is given by using the generalized Peach- Koehler formula. As a numerical illustration, both the equilibrium position and the stability of the disclination dipole are evaluated for different material combinations, relative thickness of an NT, surface/interface effects, and the features of the disclination dipole. The results show that as the thickness of the NT layer increases, the NT has a relatively major role in the force acting on the disclination dipole in the NT-based composite. The cooperative effect of surface/interface stresses and the NT becomes considerable as the increase of NT layer thickness. The equilibrium position may occur, even more than one, due to the influences of the surface/interface stress and the NT thickening. The influences of the surface/interface stresses and the thickness of the NT layer on the force are greatly dependent on the disclination angle. 相似文献
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考虑轴和盘的质量及轴的几何非线性，建立了在周期轴向载荷作用下具不对称粘弹性支承弹性盘轴转子系统的非线性动力学方程．基于Lyapunov运动稳定性理论和Floquet判据，对系统的线性和非线性动力稳定性进行了分析． 相似文献
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