共查询到19条相似文献,搜索用时 78 毫秒
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《Journal of Modern Optics》2013,60(7):505-518
Some aspects of feedback technique in optical systems are examined. The eigenfunctions suitable for describing systems where both space and frequency limitations occur are discussed. Applications to the generation of super-resolving pupils and to the band unlimited restoration of images are presented. 相似文献
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Abstract A system for quantum cryptography using polarization-preserving optical fibre and a feedback loop to compensate for time-dependent changes in the state of polarization has been implemented. Error rates of less than 0·5% have been demonstrated and much lower error rates can be expected in the future. An improved system that does not require the use of polarization-preserving fibre, and with expected data transmission rates of 100 kHz, is under construction. 相似文献
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1.引言
在电声系统、语音通信、视频网络会议系统与有源噪声控制系统的应用中,声反馈往往是一个无法忽视的因素.在大多数的情况下,反馈是一个需要克服的重要问题,解决得不好轻则影响系统性能,如限制扩声系统的信号增益,干扰语音信号质量,限制有源控制系统的降噪效果等等,重则破坏系统的稳定性,产生自激震荡噪声,致使系统无法工作,甚至导致系统完全失效. 相似文献
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一个图的反馈点集指的是在去掉时导致图无圈的节点子集.反馈集问题来源于组合电路设计,在操作系统死锁预防,人工智能的贝叶斯推断、网络理论有大量应用.六角形蜂窝网络是一种新近提出的并行计算互连网络.本文通过构造的方法求出了蜂窝网格和蜂窝圆环面网络的反馈数. 相似文献
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G. A. Ummarino 《Journal of Superconductivity and Novel Magnetism》2012,25(5):1333-1337
The experimental data of four iron-pnictides superconductors: LaFeAsO1?x F x , Ba1?x K x Fe2As2, SmFeAsO1?x F x , and Ba(Fe x Co1?x )2As2 have been examined and explained in the framework of a three bands s± wave Eliashberg theory with only two free parameters plus a feedback effect, i.e., the effect of the condensate on the antiferromagnetic spin fluctuations responsible of the superconductivity in these compounds. From the theory, it is possible to obtain the values of critical temperature, superconductive gaps, upper critical field, etc. in very good agreement with experimental data in a moderate strong-coupling regime: ?? tot??2.4?C2.8. 相似文献
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Distributed Feedback Fiber Laser Strain Sensors 总被引:3,自引:0,他引:3