可以分析的

With the support of a major research grant of Zhejiang Province (No. 001101027) and the Plan of Promoting Education of Excellence of Zhejiang University in the 21st Century, this dissertation is devoted to address the above problems and fabricate an L-band EDFA with low cost, high performance and technological innovation.First the mechanism of an erbium doped fiber amplifier is introduced. Various theoretical models based on classical rate propagation equations are summarized and compared for their applications. We use a modified numerical model based on the Giles model, which agrees with the experimental results well. This serves as the theoretical base for the whole thesis and will be used to optimize the characteristics of EDFAs. A novel method based on a map of noise figure and gain is proposed to analyze efficiently the dependence of the noise figure and gain for EDFAs on the EDF length and the pump power. The characteristics of various EDFAs are studied and compared.Secondly, some important parameters are introduced to describe the characteristics of EDFAs. The methods and the experimental setups for measuring the gain and noise figure of an EDFA are emphasized. We introduce how to measure the characteristics of each component of an EDFA, especially the gain and absorption coefficient of an erbium doped fiber.Thirdly, four types of simple and novel L-band EDFA structures with low noise, high gain and low gain ripple are proposed to satisfy the requirement of a DWDM system. They can be classified into two categories. In the first category, a single ASE pumping is served asa secondary pump. This category includes the following three types. Type: a new construction using a fiber Bragg grating in an unpumped EDF section at the input side. Type: a new structure of L-Band EDFA with two-stage pumps, which utilizes the forward ASE as a second pump.

本论文本着科技创新、服务于生产实践的精神，以设计价格低廉，性能优越、结构合理简单的L-band EDFA为目标，依托浙江省科技厅重大科学基金资助项目(001101027)和浙江大学振兴教育计划资助的全光网络的搭建—《光通信技术》课程实验建设项目，展开了如下工作：首先，介绍了掺铒光纤放大器的工作原理，归纳总结了基于速率方程基础的EDFA的各种理论模型，分析比较了各个模型的特点和适用场合，最终选择完善的Giles理论模型作为本论文分析设计EDFA的理论基础；针对实际实验条件提出了修正的EDFA模型的数值计算方法；创新地提出了增益—噪声系数全局分析法，直观有效地分析了EDFA的增益和噪声系数与掺铒光纤长度和泵浦功率的依赖关系，并对各种EDFA的性能作了全面的比较；第二，介绍了掺铒光纤放大器特性参数的定义与测量方法，重点介绍了噪声系数和增益系数的测量方法及实验装置；介绍了组成掺铒光纤放大器各组件的特性测量方法，重点介绍了测量掺铒光纤参数的方法和实验装置；第三，针对WDM系统对L-band EDFA谱平坦、低噪声、高增益的要求，我们创新地提出了四种不同的L-band EDFA结构，按设计思路可以分为两大类：一类是基于单抽运二级泵浦法，这一类包括在未泵浦掺铒光纤的输入端插入一根布拉格光纤光栅的两段L-band的EDFA的新结构；基于前向ASE光作为二级泵浦源推动下一级EDF工作的泵浦分配、两段级联L-band的EDFA的新结构；基于单根光纤光栅、泵浦分配、两段级联的EDFA；另一类则是基于同时应用前后向C-band ASE作二级泵浦源的双抽运法，如基于前后向ASE光作为二级泵浦源的三段级联L-band的EDFA的新结构。

The data analysis also showed that by the nonlinear dynamic analysis of the local transient behaviors a general comparison can be made in the turbulent bed, fast bed, pneumatic conveying system and the developed region in downers.

大量数据的分析表明，采用局部瞬态行为分析可以对湍床、快床和输送床在内的气固并流上行过程以及下行床的发展段进行统一的对比分析。

Actual application shows that the method can effectively identify the main azimuth and density of formation factures and can make comprehensive analysis and description on reservoirs with logging data.

实际资料处理表明，采用上述方法可以有效地确定地层裂缝的主体方位和密度，结合测井资料可以对储层进行综合分析和描述。

The Laiwu Steel Group Special Steel County 50 tons electric furnace electrode regulator is the analogous circuit plug-in unit type product at the beginning of 80 ages last century .because the primary device gets older and the damage is serious, which creates the system failure rate to be high and the smelting electricity consumes high.

因此，根据技术进步要求对其进行数字化改造。通过对电炉的炼钢工艺进行分析发现必须有电极的阻抗控制和保护电极和保护炉墙等功能，通过对电气系统的分析可以得到必须有短路、过电流和保护开关的功能，通过对液压机械性能进行了分析和测试发现液压阀存在死区需要进行补偿。

In Chapter three,we choose right 25 pairs among them to carry on limitanalysis to the monosyllabic antonym using the type of analytic approachsememes, show their different antithesis situation at a sememe location ,analyze the reason and main route about the meaning of a word of antonymdevelopment. Original meaning and original meaning can be realizedsetting at a certain location;extended meaning and original meaning alsocan, etc. It has important value for analyzing the meaning of a word ofChinese antonym of the pre-Qin periodIn Chapter four, It has been analyzed in such aspects as word-building ,rhetoric and impact on antonym in later age.

第三章运用义素分析法对其中的25对单音节反义词进行了穷尽性的分析，展示了它们在不同义位上的对立情况，并进而分析了《荀子》反义词的词义演变原因和主要途径，即本义与本义之间、引申义与本义之间、假借义与本义或引申义之间和引申义与引申义之间均可以在某一义位上实现对立。

From the analysis,we can understand the principle and process of the salt forming in fractional column by the assessment of fluid mechanics of tray. the simulation of flow path;plate tower;salt forming

从分析结果可以看出，通过核算塔盘流体力学可以定性地看出分馏塔结盐的原理和过程。

The major research and contributions are as follows:(1) With Power System Analysis Software Package, the paper analyses the stability of operation of the power system by dynamic simulation. The simulation results show that system voltage and frequency will keep varying with the change of the wind plant's power output.

论文主要内容如下：（1）应用电力系统综合分析程序，动态仿真分析风电系统运行的稳定性，通过分析仿真结果，可以看出系统节点电压和系统频率将会随着风电场输出功率的变化而波动，波动的幅度会随着风电场容量的增加而加剧。

It can be used to know the overall level of system track with time change.

时序全局主成分分析法是经典的主成分分析法和时间序列分析法的结合，可以用来了解系统的总体水平随时间的变化轨迹。

The company owns an advanced numerically controlled production line, and could provide several standard products such as single-row ball slewing bearing, cross roller slewing bearing, double-row ball slewing bearing, three-row roller slewing bearing, according to Standard "JG/T66-1999","JG/T67-1999","JG/T68-1999" and "JB/T2300-1999", and also could provide non-standard products according to the requirements of customers.

项目介绍（简介、技术特点、应用范围、市场前景、效益分析及对投资者要求。500字以内）回转支承产品结构有单排球式、双排球式、三排柱式、交叉滚柱式四大系列，可以按国家建筑机械行业标准《JG／T66—1999》、《JG／T67—1999》、《JG／T68-—1999》和机械行业标准《JB／T2300—1999》提供系列产品，同时也可以按照客户的要求来设计、制造非标准回转支承产品。

This paper, based on the full scale bird impact tests, and detailed analysis the results of high speed photography, dynamic strain gauge, puts forward that triangle pulse simply model could be simplified by bird impact loading of inclined impact process .

对飞机风挡进行全尺寸鸟撞试验，通过对鸟弹撞击风挡玻璃过程高速摄影、动态应变测量等试验结果的分析，提出了斜撞击过程的鸟撞载荷可以简化为三角形脉冲的简化分析模型，利用该简化载荷模型对风挡玻璃鸟撞进行的有限元分析，结果和试验结果很好地相符

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。