共查询到20条相似文献,搜索用时 46 毫秒
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运用重合度理论探讨了一类非线性问题的周期解.然后将其应用于一个厄尔尼诺大气物理机理振荡,简捷地得到了该模型的周期解.
关键词:
非线性
厄尔尼诺现象
周期解 相似文献
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针对交流激励下电阻-电容分路的约瑟夫森结,采用增量谐波平衡法推导了系统中周期解的解析表达式,并运用Floquet理论分析了周期解的稳定性.发现系统处于稳定周期状态的同时,还存在着丰富的不稳定周期解.通过计算Floquet乘数,得到了系统稳定周期解失稳时的临界参数值,并确定了系统发生的分岔类型,从理论上证明了系统随激励电流幅值的增加由倍周期分岔通向混沌.解析分析与数值计算结果具有很好的一致性.
关键词:
约瑟夫森结
增量谐波平衡法
周期解
分岔 相似文献
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K. Nakamura T. Oguchi H. Hasegawa K. Sueoka K. Hayakawa K. Mukasa 《Applied Surface Science》1999,140(3-4):366-370
This article describes the possibility of measuring exchange force through atomic force microscopy (AFM), based on the results of first-principles calculations for the exchange force between two magnetic Fe(001) films. We observed strong variation of the exchange force relative to the surface site. The magnitude of the force variation was larger than the force sensitivity of conventional AFM. These results suggest that a surface magnetic image with atomic resolution can be achieved by measuring the exchange force. 相似文献
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We have studied frictional force between SiN tip and Si surface by using lateral force microscopy. The cantilever we have used has very low stiffness of 0.006 N/m, and the normal force acting on the surface was much lower than the attractive force such as van der Waals force. In this low normal force limit, it was found that the frictional force did not depend on the normal force. We suggest a calibration method to estimate the attractive force from the lateral force data in this limit. The estimated attractive force between Si sample and SiN tip with radius of 10 nm was 0.4 nN in flat region and 0.65 nN at the corner of a rectangular hole. 相似文献
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近年来磁力显微镜(magnetic force microscopy,MFM)对动态磁场信号的测量与分析由于其特殊的工业要求和重要用途而受到广泛关注,本文旨在利用交变磁力对磁性探针的周期性调制发展一种交变力磁力显微镜技术,为磁信息存储工业等重要领域关键技术的发展提供新型的有力的工具.与目前标准MFM采用的设计思路不同,本文的关键在于合理利用MFM频率调制机理,优化设计MFM磁性探针,并且引入动态信号处理模块,实现对交变磁场信号的MFM成像.为达到这些目的,需要从理论上研究MFM探针的频率调制机理,并由实验上设计出动态信号提取模块,二者相辅结合优化设计出具有动态信号测试和分析能力的交变力磁力显微镜技术,由此来测量和解释纳米尺度磁畴结构. 相似文献
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The conditions for nanotubes to be used as atomic force microscope (AFM) probes are analyzed. It is shown theoretically for
the first time that single-and multilayer tubes with diameters ranging from 0.5 to 5 nm give atomic-level resolution of the
surface. The presence of cylindrical symmetry makes each surface atom of a nanotube “imaging.” For a definite ratio of the
diameter of a single nanotube and the period of the surface structure, the atomic resolution vanishes. Such nanotubes are
of special interest for probing the details of the large-scale relief and for investigations in nanotribology. In contrast
to silicon and other (solid) probes, nanotubes are not blunted on contact with the surface, but rather they bend and their
initial shape is restored when the stress is removed. The critical loads for an AFM to function in the repulsive regime are
determined.
Zh. Tekh. Fiz. 69, 124–127 (August 1999) 相似文献
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考虑Magnus力的高尔夫球射程 总被引:1,自引:0,他引:1
对实际中有旋转的高尔夫球运动进行了分析.通过数值计算表明,粗糙球比光滑球飞得远.球的自转会产生Magnus力,对射程有显著的影响,但球的旋转并非越快越好. 相似文献
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Atomic force microscope 总被引:8,自引:0,他引:8