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Enhanced Compression of Fundamental Solitons in Dispersion Decreasing Fibers with Negative Third-order Dispersion *** Principles

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Chinese Journal of Lasers 2001年第5期 34-40页

作者： CAO Wenhua (Department of Electronic & information engineering, Wuyi university, Jiangmen 529020, china) GUO Qi LIU Songhao (Institute of Quantum Electronics, south china normal university, guangzhou 510631, china)

Compression of ultrashort fundamental solitons in dispersion decreasing fibers (DDFs) with negative third order dispersion (TOD) is investigated by solving the generalized nonlinear Schrdinger equation numerically. We have shown that, in contrast to the degradation of soliton compression due to the combined effects of positive TOD and Raman self scattering (RSS), the combined effects of negative TOD and RSS can significantly enhance soliton compression in DDF′s. The enhancement is due to RSS induced redshifting of the soliton wavelength and the negative TOD induced decrease of second order dispersion toward the longer wavelength.

关键词： fundamental solitons pulse compression dispersion decreasing fibers third order dispersion Raman self scattering.

Epithermal Ageing Mechanism of Gussasphalt

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Journal of Wuhan university of Technology(Materials science) 2009年第3期24卷 466-470页

作者：郝增恒 School of Traffic science and engineering Harbin Institute of Technology Chongqing Communications Research and Design Instituts

The normal asphalt index test, DSR test, FTIR and the GPC distribution analysis of molecular weight on the extraction and recovery of asphalt of the gussasphalt, SMA extraction and recovery of asphalt and the rotary-thin-film-oven-aged asphalt above 240 ℃ were introduced. The results indicate the rutting factor and fatigue factor of the extraction and recovery of asphalt of the gussasphalt are greatly improved, and an obvious absorption peak of carbonyl and a further decrease of the SBS molecular weight of the gussasphalt are found.

关键词： gussasphalt epithermal ageing rheolagical performance fourier transforms infrared spectroscopy gel permeation chromatography

PREPARATION AND SURFACE CHARACTERIZATION OF TiO2 THIN FILMS ON GLASS BY MAGNETRON SPUTTERING METHOD

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Acta Metallurgica Sinica(English Letters) 2002年第2期15卷 207-209页

作者： L.S.Yin1,3), H. Shen2) and J.X. Zhang3) 1)College of information engineering, Central south university, Changsha 410075, china 2)guangzhou Institute of Energy Conversion, CAS, guangzhou 510070, china 3)Department of Physics, Zhongshan university, Guang Coll. of Info. Eng. Central South Univ. Changsha 410075 China

Ti thin films were firstly deposited on glass substrates by magnetron sputtering method, then sintered the Ti thin films in air atmosphere and finally TiO2 transparence thin films on glass substrates were obtained. The structure and surface morphologies of the thin films were characterized by X-ray diffraction and SEM. The growth process of the thin films has been observed. The annealing time and annealing temperatures have an affect on the growth of the films.

关键词： TiO2. thin film. magnetron sputtering

基于二维囚禁离子实现受控非门、交换门和相位门

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物理学报 2008年第9期57卷 5589-5592页

作者：艾凌艳杨健张智明华南师范大学信息光电子科技学院光子信息技术广东省高校重点实验室广州510006

研究了二维囚禁离子与光场相互作用系统中几种基本量子逻辑门的实现方案.通过适当选取激光场与离子内部跃迁频率的失谐量,简化了系统的哈密顿量,并进一步推导出受控非门(C-NOT门)、交换门与相位门的实现方法.在此过程中,系统需满足Lamb-... 详细信息

研究了二维囚禁离子与光场相互作用系统中几种基本量子逻辑门的实现方案.通过适当选取激光场与离子内部跃迁频率的失谐量,简化了系统的哈密顿量,并进一步推导出受控非门(C-NOT门)、交换门与相位门的实现方法.在此过程中,系统需满足Lamb-Dicke极限,并要求光场的Rabi振荡频率远远小于离子的振动频率.

关键词：囚禁离子受控非门(C-NOT门) 交换门相位门

不同阅读水平与文章熟悉程度条件下文章标记效应的研究

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心理科学 2004年第3期27卷 595-597页

作者：何先友华南师范大学心理系广州510631

探讨文章阅读过程中读者的阅读水平与文章熟悉程度对文章标记效应的影响。结果表明,文章标记与文章主题熟悉程度存在显著的交互作用,文章标记对熟悉文章的信息保持无明显的促进效应,但对不熟悉文章信息保持的促进效应非常明显;文章标记... 详细信息

探讨文章阅读过程中读者的阅读水平与文章熟悉程度对文章标记效应的影响。结果表明,文章标记与文章主题熟悉程度存在显著的交互作用,文章标记对熟悉文章的信息保持无明显的促进效应,但对不熟悉文章信息保持的促进效应非常明显;文章标记对不同阅读水平读者的文章信息保持都有显著的促进效应,但对阅读水平高的读者的促进效应大于对阅读水平低的读者的促进效应。文章阅读中的结构搜索加工的观点得到初步证明。

关键词：文章标记效应文章熟悉程度阅读水平结构搜索加工

A gain-flatness optimization solution for feedback technology of wideband low noise amplifiers

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Journal of Zhejiang university-science C(Computers and Electronics) 2011年第7期12卷 608-613页

作者： Zhen-hua LI,Bang-hong GUO,Zheng-jun WEI ,Song-hao LIU,Nan CHENG,Jin-dong WANG,Jian-jun GUO,Long YAN (Key Laboratory of Photonic information Technology of Guangdong Higher Education Institutes,SIPSE & LQIT,south china normal university,guangzhou 510006,china) Key Laboratory of Photonic information Technology of Guangdong Higher Education Institutes SIPSE & LQIT South China Normal University Guangzhou China

The S parameter expression of high-frequency models of the high electron mobility transistors (HEMTs) with basic feedback structure,especially the transmission gain S 21,is presented and *** addition,an improved feedback structure and its theory are proposed and demonstrated,in order to obtain a better gain-flatness through the mutual interaction between the series inductor and the parallel capacitor in the feedback *** optimization solution for the feedback amplifier can eliminate the negative impacts on transmission gain S 21 caused by things such as resonance ***,our theory covers the shortage of conventional feedback amplifiers,to some extent.A wideband low-noise amplifier (LNA) with the improved feedback tech-nology is designed based on *** transmission gain is about 20 dB with the gain variation of 1.2 dB from 100 MHz to 6 *** noise figure is lower than 2.8 dB in the whole band and the amplifier is unconditionally stable.

关键词： Low-noise amplifier (LNA) Ultra-wideband HEMT Feedback Gain flatness

ON THE GROWTH OF SOLUTIONS TO HIGHER ORDER DIFFERENTIAL EQUATION

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Annals of Differential Equations 2012年第2期28卷 170-179页

作者： Juan Gong, Zongxuan Chen (School of Mathematical sciences, south china normal university, guangzhou 510631) Xiumin Zheng (Institute of Math. and information science, Jiangxi normal university, Nanchang 330022)

In this paper, we consider a higher order differential equation and obtain a precise estimate of the order of growth and the hyper-order of solutions to the equation.

关键词： differential equation entire function order of growth hyper-order

Generation of high-energy dual-wavelength domain wall pulse with low repetition rate in an HNLF-based fiber ring laser

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Chinese Physics B 2014年第6期23卷 217-220页

作者：罗智超林振彬李金玉朱鹏飞宁秋奕邢晓波罗爱平徐文成 Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and Engineering South China Normal University Department of Environmental engineering Guangdong Industry Technical College MOE Key Laboratory of Laser Life science and Institute of Laser Life science College of BiophotonicsSouth China Normal University

The generation of high-energy dual-wavelength domain wall pulse with a low repetition rate is demonstrated in a highly nonlinear fiber （HNLF）-based fiber ring laser. By introducing the intracavity birefringence-induced spectral filtering effect, the dual-wavelength lasing operation can be achieved. In order to enhance the cross coupling effect between the two lasing beams for domain wall pulse formation, a 215-m HNLF is incorporated into the laser cavity. Experimentally, it is found that the dual-wavelength domain wall pulse with a repetition rate of 77.67 kHz could be efficiently obtained through simply rotating the polarization controller （PC）. At a maximum pump power of 322 mW, the 655-nJ single pulse energy in cavity is obtained. The proposed configuration provides a simpler and more efficient way to generate high energy pulse with a low repetition rate.

关键词： fiber lasers high-energy pulse domain wall low repetition rate

Healthy aquaculture pattern and technology without environment pollution

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Healthy aquaculture pattern and technology without environme...