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A Two-Dimensional Photonic Crystal Slab Mirror with Silicon on Insulator for Wavelength 1.3μm 下载免费PDF全文
A concrete two-dimensional photonic crystal slab with triangular lattice used as a mirror for the light at wavelength 1.3μm with a silicon-on-insulator (SOI) substrate is designed by the three-dimensional plane wave expansion method. For TE-like modes, the bandgap in the Г-K direction is from 1087nm to 1559nm. The central wavelength in the bandgap is about 1.3μm, hence the incident light at wavelength 1.3μm will be strongly reflected. Experimentally, such a photonic crystal slab is fabricated on an SOI substrate by the combination of EBL and ICP etching. The measurement of its transmission characteristics shows the bandgap edge in a longer wavelength is about 1540 nm. The little discrepancy between the experimental data and the theoretical values is mainly due to the size discrepancy of the fabricated air holes. 相似文献
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远程开放教育的特征与人才培养目标决定了班主任工作的重要地位,班主任是班级管理的教育者、组织者、领导者,校规校纪的执行者,教与学双向交流的沟通者,学员学习、生活、娱乐的辅导员。肩负着领导、引导、辅导和帮助学员更好的学习的责任。在学员的健康成长中起着导师的作用。而中央电大"人才培养模式改革和开放教育试点"项目的班主任与传统意义上的班主任工作有很大区别,这就要求大家要不断探索班主任工作的新规律。 相似文献
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本报道了利用作研制的一种新的光学元件-单频散斑光栅模进行面内位移场测量的方法及原理。 相似文献
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云南十字花科蔬菜根肿病发生规律及防治技术研究 总被引:2,自引:0,他引:2
十字花科蔬菜根肿病是由鞭毛菌亚门芸苔根肿病菌(Plasmodiophora brassicae)侵染引致的一种土壤传播病害.在云南10个地州市49个县(区)均有发生.全年均可发病,并有夏秋病重,冬春病轻的危害特点.大白菜、甘蓝全生育期均可感病,尤以苗期为烈.二叶期以前是病菌最早的侵入时期.因此,幼苗期是防治重点,培育无病壮苗是防病保苗保产的关键措施.大白菜品种间抗病性差异明显,通过田间筛选,白菜王、星星、俄罗斯大白菜等品种较抗病;百菌清、甲基托布津等是防治根肿病的有效药剂. 相似文献
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A copper(Ⅱ) complex 1 of a novel macrocyclic polyamine ligand with hydroxylethyl pendant groups, 4,11-bis(hydroxylethyl)-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (L) has been synthesized and characterized. Rate enhancement for hydrolysis of p-nitrophenyl picolinate (PNPP) catalyzed by 1 was studied kinetically under Brij35 micellar condition. For comparision, the catalytic activity of corresponding copper(Ⅱ) complex 2 of non-substituted macrocyclic polyamine ligand, 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraaza-cyclotetradecane (L') toward the hydrolysis of PNPP was also investigated. The results indicate that the macrocyclic polyamine copper(Ⅱ) complex 1 effectively catalyzed the hydrolysis of PNPP, and the pendant ligand hydroxyl group or deprotonated pendant ligand hydroxyl group can act as catalytically active species in the reaction. A ternary Complex kinetic model involving metal ion, ligand and substrate has been proposed, and the results confirmed the reasonability of such kinetic model. 相似文献
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