共查询到18条相似文献,搜索用时 658 毫秒
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利用数量曲率,建立了紧致极小子流形的内蕴各分不等式,并依此对第二基本形式长度的平方满足某些条件的紧致极小子流形,刻划了它们的性质。 相似文献
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利用数量曲率 ,对实流形的极小子流形和K hler流形的紧致复子流形进行了研究 ,得出了它们的一些整体性质 . 相似文献
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利用数量曲率,对实流形的极小子流形和Kaehler流形的紧致复子流形进行了研究,得出了它们的一些整体性质。 相似文献
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本文完全解决了局产对称Bochner-Kachler流形的全实极小子流形的李奇曲率的pinching问题。 相似文献
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利用数量曲率与第二基本形式长度之间的一个不等式关系,证明了其子流形的截面曲率一定非负(或者为正),并将此应用到紧致子流形上,得到一些结果. 相似文献
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给出了quasiKaehler流形的CR—子流形上分布可积的几个充要条件,推广了Bejancu的部分结论. 相似文献
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紧致融合模糊集和故障树的变压器故障诊断 总被引:2,自引:0,他引:2
为弥补传统单一诊断在变压器故障诊断应用中的不足,在全面分析模糊集和故障树各自优势的基础上提出了紧致融合模糊集和故障树的变压器故障诊断方法,旨在有机融合模糊集和故障树的优点,提高变压器故障诊断的准确性和效率。以故障树理论分析为基础,构建了紧致融合模糊集和故障树的诊断模型,重点阐述了其构建方法和诊断逻辑。案例分析表明:相比与传统的故障树诊断技术,紧致融合模糊集和故障树的变压器故障诊断技术的容错能力更强;诊断结果记录了诊断的一些中间过程,并在信息不完备的情况下,返回相关的信息为研究人员进行下一步分析提供参考。 相似文献
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讨论了具有常数曲率流形的常中曲率紧致超曲面 ,在某些Pinching条件下 ,得出该超曲面是全脐的 ,且等距于标准球面 相似文献
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Myong-Jong Yoon Kee-Ho Yu 《IEEE transactions on neural systems and rehabilitation engineering》2008,16(2):171-177
In this paper, a preliminary experimentation is carried out to investigate the necessary stimulation conditions for a pattern display that may be used for the blind to display obstacle distribution. To design an efficient vibrotactile display device of array-type and compact size, the effect of some main parameters, such as the amplitude and frequency of vibration and the spacing and quantity of vibrated pins on vibrotactile perception, should be considered. Through experiment and analysis, the minimal amplitude of vibrating stimuli and the spacing effect on the perception of vibrotactile pattern are investigated and discussed. Also an appropriate type of actuator satisfying the requirements of a compact tactile display device for the effective transfer of pattern information is discussed. 相似文献
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《Education, IEEE Transactions on》1996,39(1):97-99
The authors present a very simple method, useful for classroom teaching, to obtain a minimal state-space representation (with the exception of systems where there is a pole-zero cancellation) from a transfer function matrix. The method is direct and does not involve the intermediate step of obtaining nonminimal realization-which further requires system reduction routines-and hence is suitable as a compact self-contained topic which has been hitherto neglected in undergraduate linear control theory curriculum 相似文献
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Waters R. Patterson J. Van Zeghbroeck B. 《IEEE journal of selected topics in quantum electronics》1999,5(1):33-35
We report for the first time the monolithic integration of a micromechanical modulator and a p-n photodiode on a silicon substrate yielding a versatile optoelectronic device. Because both devices are monolithically integrated on a silicon substrate, the combination is compact with minimal parasitic elements. We demonstrate that such a device combination fields a transistor-like element with positive and negative small-signal voltage amplification. The maximum small-signal voltage gain achieved is 500 while the modulated current of the device exhibits a maximum ON-OFF ratio of 3:1. In addition, while the theoretical current gain of the device is infinite, a 10-pA noise level limited the measured dc current gain to 106 相似文献
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