排序方式: 共有17条查询结果,搜索用时 15 毫秒
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Xiaoguang Zhang Yue Wang Junming An Jiashun Zhang Hongjie Wang Jianguang Li Liangliang Wang Xiongwei Hu Yuanda Wu 《Optics Communications》2012,285(10-11):2536-2540
In this paper, we designed and fabricated a four-channel optical add-drop multiplexer (OADM) based on dual racetrack resonators. The size of the fabricated device is only 2400 μm × 500 μm. The fabricated device can effectively and perfectly realize the signals upload and download. The free spectral range (FSR) of OADM is about 15.2 nm. We take the spectral responses near 1555 nm as an example. When the device acts as an optical drop multiplexer, the minimum insertion loss is 4.481 dB and the maximum extinction ratio is 31.931 dB. The maximum adjacent channels crosstalk is -9.845 dB. When the device acts as an optical add multiplexer, the minimum insertion loss is 0.944 dB and all of the extinction ratios are bigger than 25 dB. The maximum crosstalk is -16.531 dB which indicates the crosstalk can be neglected. 相似文献
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Zhang Yuanda 《数学年刊B辑(英文版)》1983,4(1):77-94
In this paper,the following theorem is proved:Let p be a prime distinet from 3 and 7,then the groups of order 2~3 p~2 have1)60 types when p=1(mod 8),2)52 types when p=5(mod 8),3)42 types when p=3,7(mod 8). 相似文献
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为保障大规模电力系统变电线路的正常运行,提高变电线路的工作质量,需要对大规模电力系统变电线路异常进行实时检修。当前方法利用一个函数对线路的异常进行检测,把异常码传输给调用者,直至该异常码传输至响应该异常的处理函数。该方法无法对变电线路的异常进行实时检修,降低变电线路的维修效率,还造成电网电流传输的中断,电网安全性得不到保障。为此,提出一种基于CIM的大规模电力系统变电线路异常实时检修方法。该方法利用小波变换对变电线路异常发生之后5ms内,异常点电流时域和时频域中的不同特征进行提取,并将提取结果当作变电线路异常点分类特征量。根据模糊支持向量机完成变电线路异常点的模糊分类,分析在异常点特征空间组建带状分段的隶属度函数,通过支持向量回归机构建其最佳的分类回归函数。实验结果证明,所提方法可以高效对大规模电力系统变电线路异常进行实时检修,为该领域的研究发展提供强有力的依据,具有实际利用价值。 相似文献
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聚合物是一种软物质 ,而软物质最典型的特征就是易于对外场的变化作出响应 ,通过控制外场类型和强度可以调控软物质的结构形成 ,从而改变聚合物在不同外部环境下的效能 .Serpico和Venugopal等人[1 ,2 ] 在静电场下浇注PS与PEO共混物 ,结果发生相分离 ,并沿静电场方向呈柱状排列 .而在强静电场下聚合物薄膜微晶体生长研究尚鲜见报道 ,本文研究了高真空不同强度静电场下聚合物薄膜微晶体生长的显微形态 .1 实验部分0 5wt%的等规聚丙烯 (iPP)、0 5wt%的十二烷基取代聚噻吩 (P3DDT)、0 5wt%的等规聚丙烯… 相似文献
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研究了基于硅基集成光波导的马赫-曾德干涉仪(MZI)型化学传感芯片的设计、制备及相关敏感特性的模拟和分析.传感芯片采用硅基二氧化硅光波导材料,利用与传统互补型金属氧化物半导体(CMOS)兼容的工艺技术制作.通过波导的单模设计以及对MZI结构的优化,获得了有效折射率分辨率达到10-7量级的高灵敏度传感芯片.作为化学传感器,把MZI的其中一臂设计成传感臂.并进行适当的表面修饰,可制作出高灵敏度的干涉型光波导化学传感器.最后,对该传感器的折射率分辨率、敏感特性等进行了分析、模拟,同时,对面临的关键问题进行了分析和讨论. 相似文献
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Xueshan Xiao Shoushi Fang Lei Xia Weihuo Li Qin Hua Yuanda Dong 《Journal of Non》2003,330(1-3):242-247
The effect of strain rates from 1 × 10−4 s−1 to 2 × 103 s−1 on tensile fracture morphologies of Zr52.5Al10Ni10Cu15Be12.5, Zr65Al10Ni10Cu15, and Zr52.5Al10Ni14.6Cu17.9Ti5 bulk amorphous alloys was investigated by scanning electron microscopy. The results show that the tensile fracture morphologies of three compositions of bulk amorphous alloys are dependent on strain rate. At low strain rates, the tensile fracture surface morphology of Zr-based bulk metallic glasses presents cleavage veins. However, the morphology will become microvoid-coalescence dimples when the strain rate is high enough. 相似文献
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ZHAO Deqian WANG Weihua ZHUANG YANXIN PAN Mingxiang JI Yingfei MA Xueming DONG Yuanda 《中国科学A辑(英文版)》2000,43(3):307-311
The formation of the new Zr-Ti-Cu-Ni-Be-Fe bulk amorphous alloy with high strength is reported. The effects of the iron atom
on the glass forming ability, hardness, susceptibility and thermal stability of the amorphous alloy are investigated. The
role of the iron in the formation of the bulk amorphous alloy is discussed. 相似文献