There are various problems in the current social crisis management system such as the imperfection of the warning and social system , the inefficiency of the immediate reaction and decision - making system , the insensitiveness of the informative linkage system , the modification of the performance evaluation mechanism and the imperfect of the law system 我国现有的社会危机管理机制存在的问题主要表现在预警系统和机制不完备、快速反应决策机制效率低、信息联动机制不灵敏、社会参与机制有待完善、绩效评价机制需要重新修正、法律机制不健全等方面。
Through the analysis on the ratio of investment to output , we found that highway transportation obtained great strength from the development of market economy , which demonstrates the transition from strong to feeble , while the railway transportation did on the opposite direction 通过投入产出比的分析，发现了公路运输从市场经济发展中获得了较大的力量，随着市场经济的发展而由弱变强的过程。而铁路运输随着市场经济的进一步发展由强向弱转变，暴露出其对市场经济信号反映不灵敏的弱点。
For long - haul high bit rate trunk line optical fiber communication system and metro optical fiber network , a semiconductor optical amplifier ( soa ) is the most promising component due to its all kinds of properties and small dimension , compactiveness , low drive voltage , such as in optical network solutions , polarization - insensitive semiconductor optical amplifier ( pisoa ) is a popular candidate as optical gates . but the polarization - insensitivity over large wavelength range is requested . the purpose of this thesis is to develop a soa which is polarization - insensitive and has large 3db bandwidth 随着宽带传输和宽带接入以及全光网的组建和发展，大带宽偏振不灵敏半导体光放大器( semiconductoropticalamplifier , soa )由于其易于与其它器件集成，体积小，具有快的动态增益响应，非线性好，饱和输出大，可实现无损操作等特点，在光通信网络中，成为光纤通信发展，全光网组建以及wdm 、 tdm技术成熟的关键部件之一，其中偏振不灵敏和大的3db带宽是性能优良soa的重要指标，也是制备的技术难点。
