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Studies on basic working principles and designs of fiber lasersThe basic working principles as well as the major characteristics of laser and fiber lasers are firstly reviewed,including the interaction between light and matter, the laser oscillation conditions and the spectrum distribution,the gain characteristic and spatial hole burning effect,the influence of external environment on the stability of laser output and the actual limits of fiber laser bandwidth;The designs of bidirectional single-mode Er-doped fiber ring laser and multi-wavelength laser is then discussed,respectively;The characteristics of dynamic grating reflection spectrum of the fiber saturable absorber is systematically analyzed.?

在激光型光纤传感器的设计、实验现象的理论解释等方面做了如下的研究工作:光纤激光器的基本原理与设计方案概述了激光和光纤激光器的基本原理,包括光与物质的相互作用,激光振荡的条件及频谱分布等激光产生的基本原理:掺铒光纤的增益性质,空间烧孔效应和外界扰动对激光输出稳定性的影响,光纤激光器的实际极限带宽等光纤激光器的相关知识;分别讨论了双向单纵模环形腔激光器和多波长激光器的设计方案;系统地分析了掺杂光纤饱和吸收体中形成的动态光栅的反射谱特性。

Gabor-ring is often used in texture feature extraction, but it is based on the assumption that texture is narrowband signal and can not applied to most actual textured images that have more than one center frequency in power spectrum. To overcome the limitation of existing method, an improved method is proposed. According to this method, Gabor filters are constructed in accordance with the spectrum feature vector of texture, and a relaxation parameter is used to determine the effect of difference filters so as to integrate the frequencies and phases into the process of extraction.

Gabor环(即在频率域成环形分布的Gabor滤波器组)常被用于提取图像纹理特征,但它是以"纹理是窄带信号"为基础的,实际的纹理图像并不能很好地满足"窄带信号"的假设,用一个中心频率来描述一种纹理对能量集中在多个频率点的纹理图像往往不能取得理想的效果,而根据频谱特征值向量构造Gabor环的改进方法,通过松弛因子的加入改变不同滤波器的作用强度,综合考虑了多频率多相位对纹理特征提取的影响。

The writer carries on processing to the Laichau area ETM remote sensing phantom data with application digital image processing method, and has obtained the good effect. She has withdrawn the mineralization alteration information and strengthened the loop of wire phantom characteristic. She has verified the golden ore deposit was in the loop of wire structure connection, the junction cuts as well as the ring structure edge spot. With the aid of in the remote sensing study information analysis method, the writer withdraws the mineralization advantageous loop of wire structure from the remote sensing phantom, and uses the mineral resource appraisal analysis system MORPAS software developed by China University of Geology to linear structure quantitative, gained massive quota information related with the gold mineralization.

本文应用数字图像处理方法对莱州地区的ETM遥感影像数据进行处理,取得了较好的效果,提取出了矿化蚀变信息并增强了线环影像特征,已探明的金矿床均处于线环构造交汇、交切以及环形构造边缘部位;借助于遥感地学信息分析方法,从遥感影像中提取成矿有利的线环构造,并利用中国地大开发的矿产资源评价分析系统MORPAS软件对线性构造定量化,获取了大量与金矿化有关的定量信息。

She loosened the half-hoop of diamonds on her left hand third finger and held it out to him playfully.

她取下左手中指上的半环形钻石戒指,开玩笑地递给了他。

Single layer ringlike fabric was formed in accordance with the cone shape with high productivity and low cost . This type of fabric can be used to wind cone shape composites conveniently .

可按照锥形件的外廓形状生产单层环形织物,生产效率高,设备费用低,生产的预成型织物可以方便地缠绕成型锥形复合材料。

The smaller piston is incorporated internally of the output shaft, while the larger piston, of an annular shape, coaxially surrounds the output shaft.

较小的活塞(58)被设在输出轴(16)内部,而较大的活塞(68)呈一环形形状,其同轴地环绕输出抽(16)。

Has not gone home the joy, thinks plot then, they very wanted to advise against the heroic black German graceful senior officials actually, did not want to let him go, because escaped distressedly the crater "the star tyrant" a group, already was the dead end, had no need for he to make final preying on personally radically!

当星际飞行器,缓缓降落在地球总部基地的地面上时,回想着不久前,血雨腥风中战斗的一幕幕,大卫博士没有一丝回家的喜悦,想想当时的情节,其实他们很想劝阻住英勇的黑德曼长官,不想让他去,因为狼狈逃出环形山的&星霸&一伙,已经是穷途末路了,根本用不着他亲自去做最后的搏杀!

Presents the concept of accessibility analysis for heating networks especially for the multi-heat sources and mult

通过所编制的相应软件对国内几个大型集中供热网的分析研究结果表明,在环形网上合理地装配和调节阀门,有利于改善系统的工况,充分利用管网的输送能力,提高运行的经济性。

This purpose of design is a computer simulation ventricle except that electric vector quantity of the heart surrounds the running orbit very much, through the stereoscopic and dynamic way, show the course that the vectorial ring of electricity of heart forms, can make student image, understand electric vector quantity of the heart ocularly; Type the well practical foundation in order to study the kind electric picture.

本设计目的是计算机模拟心室除极心电向量环运行轨迹,通过立体动态的方式,展示心电向量环形成的过程,使学生能够更形象,直观地理解心电向量;为学好心电图打好切实的基础。

A through bore in the plastic carrier member receives the sealing element, which is formed with an annular groove in which the carrier member is removably secured.

在该弹性支承件内的一通孔可容纳密封件,该密封件形成有一环形槽供支承件可拆地固定。

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However, as the name(read-only memory)implies, CD disks cannot be written onorchanged in any way.

然而,正如其名字所指出的那样,CD盘不能写,也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口,替代木托盘,免薰蒸,符合欧盟、北美各国对出口货物包装材料的法令要求;喷涂钢托盘适用于重载上货架之用,托盘表面根据需要制作成平板状、波纹状及间隔形式,满足不同的使用要求。

A single payment file can be uploaded from an ERP system to effect all pan-China RMB payments and overseas payments in all currencies.

付款指令文件可从您的 ERP 系统上传到我们的电子银行系统来只是国内及对海外各种币种付款。