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In this paper, the propagation and focus properties for several modes describing hollow beam are analyzed, and the focus properties for hollow gaussian mode are particularly discussed. Furthermore, a new mode, high-order Bessel-Gauss mode, is put forward to describe hollow beams. The results for high order Bessel-Gauss beams propagating through lens focusing system and free space are derived by terms of Collins integral formula.

本文分析了几种描述空心光束数学模型的传输特性和聚焦特性，着重讨论了描述非中空光束的数学模型的聚焦特性；同时提出了一种描述完全中空的空心光束的新模型――高阶贝赛耳高斯模型，并且运用Collins积分公式，分析了这种新模型的空心光束的传输特性和聚焦特性。

In this work, the equations describing circular Gaussian beams propagating inside absorptive Keer medium have been derived from nonlinear paraxial equation. Based on the equations, an evolution equation of beam waist lias been obtained.

本文从非线性近轴波方程出发，导出了在吸收克尔介质中具有二次位相因子的圆对称高斯光束的传输方程，得到了光束束腰的演化方程。

In the routine of the library, the work of using students to participate in the service of the library , managing , propagating etc, not only has promoted the deepening development that the reform of the library worked , has improved the inside environment of the library, to improving the service quality of the library , utilize existing information resources to all have very great facilitation to the maximum extent, and give full play to the education function of the library , temper students' managerial ability , ability to organize and link up ability , have improved students' quality and training.

在图书馆的日常工作中，适度地使用学生参与图书馆的服务、管理、宣传等工作，不但促进了图书馆改革工作的深入发展，改善图书馆的内部环境，对提高图书馆的服务质量，最大限度地利用现有信息资源都有很大的促进作用，而且充分发挥图书馆的教育职能，锻炼了学生的管理能力、组织能力和沟通能力，提高了学生的素质和修养。

By monitoring an electrical signal that is output from the light receiving element, it is possible to monitor the light propagating through the optical fiber.

通过检测从光接收元件(32)输出的电信号、可监视穿过光纤(22)传送的光。

Beside, this thesis will discuss a number of the location identification methods, such as TDOA, TOA and AOA, etc. By utilizing the time interval of propagating signal as my basic location identification parameter, this thesis examines the suitable location identification methodology based on the Wireless Sensor Network configuration developed within NTU. Some preliminary tests were performed to verify the performance of the newly developed system.

本论文主要目的在於开发适用於无线感测器网路的定位晶片和分析定位功能於现有硬体架构下之可行性，首先本论文中将介绍各种定位方法如TDOA、TOA和AOA等等，最终以量测无线电讯号於空气中传播之时间间隔作为定位架构的基本参数，并试著针对本实验室无线感测器网路的架构寻找适合的定位方式，并进行初步的测试。

The main thrust of this dissertation is to develop the Application Specific Integrated Circuit of location identification for Wireless Sensor Network and to analyze the capability of location identification in existing hardware. Beside, this thesis will discuss a number of the location identification methods, such as TDOA, TOA and AOA, etc. By utilizing the time interval of propagating signal as my basic location identification parameter, this thesis examines the suitable location identification methodology based on the Wireless Sensor Network configuration developed within NTU. Some preliminary tests were performed to verify the performance of the newly developed system.

本论文主要目的在於开发适用於无线感测器网路的定位晶片和分析定位功能於现有硬体架构下之可行性，首先本论文中将介绍各种定位方法如TDOA、TOA和AOA等等，最终以量测无线电讯号於空气中传播之时间间隔作为定位架构的基本参数，并试著针对本实验室无线感测器网路的架构寻找适合的定位方式，并进行初步的测试。

More generally, Luddite intellectuals are successfully propagating "the precautionary principle," which states that we should never try anything new unless we are certain that it is absolutely safe.

极平常地，勒德分子有知识者正成功地宣传"预防原则"声明我们决不尝试新的除非我们确定它绝对安全。

According to two_level model of atom, we systematically analyze the quantum reflection and transmission of the vector atomic matter wave with internal structures propagating through a laser beam.

特别是对"粒子隧穿一个势垒是否需要时间"或者"量子隧穿时间是多长"这一问题[14]的讨论在量子力学基本问题研究中一直占有相当重要的地位。

Sunlight, therefore, is a mechanical wave created by manyvariable forces propagating huge energy through an electromagneticwave medium.

由此可见，太阳光是太阳由于受到多个变力作用而形成的以电磁波为媒介，始终传递着巨大能量的机械波。

Sunlight, therefore, is a mechanical wave created by many variable forces propagating huge energy through an electromagnetic wave medium.

由此可见，太阳光是太阳由于受到多个变力作用而形成的以电磁波为媒介，始终传递着巨大能量的机械波。

For every one of my New Year resolutions, I have been a backslider for years.

说到我的新年决心，我每年都做

With empathy and focus on a feeling level, we can all relate to the common ground of mutuality of emotions.

有了同情心和感觉上一级的重点，我们都可以涉及到相互的情感共同点。