查询词典 high and low

The brushless permanent magnet automobile a. c. generator has the advantages of high reliability, long service life, high efficiency, good performance at both low and high speed, low radio interference, simplifying its associated voltage regulator, cutting down materials, technology simplified, as well as high power/weight ratio, etc.,and will be a new product with broad prospects and large market.

无刷永磁汽车交流发电机由于取消了碳刷、滑环及励磁绕组，可大大提高可靠性，延长使用寿命，具有效率高，低、高速性能好、无线电干扰小，与之匹配的电压调节器结构简单、节约原材料、工艺性能好、比功大等优点。

Recently, CMOS Image Sensor which is solid-state circuit the same as CCD has developed quickly. Because it has a lot of advantages, such as high integrity, low power, simple technics, and short developing cycle that are different from the intrinsic disadvantages of CCD as complicated driving circuit, low data and frame rate, low integrity and high power, CMOS Image Sensor is widely used in industry, surveillance, avigation and spaceflight affairs. The developed countries have used CMOS Image Sensor in the domain of space exploration and navigation such as star trackers and cameras for remote sensing images.

中文摘要近年来快速发展的CMOS图像传感器与CCD一样都属于固态成像器件，但CMOS图像传感器具有高集成、功耗低、工艺简单和开发周期短等优点，克服了CCD器件驱动设计复杂、数据读取效率低、帧频低、集成度低、功耗大的固有缺点，已被广泛应用在工业、监控、航空和航天等众多领域，发达国家已经将CMOS图像传感器应用于星敏感器、遥感成像等空间探测、导航领域。

And our country's main industries are three high and one low industry--high labor coarctation, high energy consumption, high pollution and low additive value.

党的十六届三中全会明确提出：坚持以人为本，树立全面、协调、可持续的发展观，促进经济社会和人的全面发展。

However, since high-fiber makes transmission insulated between the high-voltage and low-voltage, there isn't any electromagnetic contact between the high-voltage and low-voltage. So, how to supply power for high-voltage circuits become pivotal technology, which is difficulty in research technology.

但由于采用光纤传输使高低压绝缘隔离，高低压之间没有任何电磁联系，因此如何向有源ECT高压侧电路供电就成为一项关键的技术，是研制中的技术难点。

Main factors that caused the low heat efficiency and high energy consumption were inadequate atomizing of heavy oil, low combustion air preheating temperature, high exhaust fume temperature and low insulating perfomance of furnace wall.

造成加热效率低、能耗高的主要原因有：重油雾化不充分，助燃空气预热温度低、排烟温度高、炉墙保温性能下降等。

Aim at this problem,it is proposed that the electrostatic precipitator should translate single spark track control mode with high-power and high energy expenditure under the condition of big current presently into energy saving control mode with high-voltage and low-current for high dust efficiency and low ene...

提出了应该由目前的高电流的"大功率高能耗"单一火花跟踪控制模式转变为高电压低电流的节能控制模式，在提高除尘效率的同时降低电能消耗，同时给出了节能控制策略和系统结构框图。

This article introduce the technologic character and the applicative condition of ACCC (Aluminum Conductor Composite Core/Trapezoide Wire) about the high intensity, high capacity, high heat-resistant capacity, high endurance of corrodible, low loss of a line and low an arc.

2007年中国电机工程学会年会，中国。

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。

However, due to coal-led model of development in the production, consumption patterns showed a high input, high consumption, high emission and low output of the "three-high and one low" characteristics and resources of city life cyclical, making will inevitably result in Yangquan resources Depletion and a deterioration of the environment, economic recession phenomenon.

但由于煤炭主导的发展模式在生产消费方式上表现出了高投入、高消耗、高排放、低产出的&三高一低&特征，以及资源型城市的生命周期性，使得阳泉难免会因资源枯竭而出现环境恶化、经济衰退的现象。

Wooden Packaging Factory—mainly produces high, middle and low grade packaging boxes by fine timber, including: high grade polished packaging boxes, gift boxes, packaging boxes for cigarette, wine, sugar, tea, nutriments, artworks and commodities, high, middle and low grade watch boxes, high grade jewel boxes, wooden artworks, etc.

木艺包装厂---主要以优质的木材，制作各种高、中、低档包装盒，其中包括：高档亮光类包装盒、各种礼品盒、各种烟酒糖茶包装盒、各类营养品包装盒、各类工艺品包装盒、各类日常用品包装盒、高中低档钟表盒、高档首饰盒、木制工艺品等。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。