实现周期

Utilize mathematical operation of the one-chip computer and control the function, combine the digital circuit of some scale of China, have realized the producing of variable frequency sinusoidal wave and the measurement of frequency , cycle , width of pulse to the signal ,etc.

利用单片机的数学运算和控制功能，结合部分中规模数字电路，实现了一些波形的输出，及对信号的频率、周期、脉冲宽度等的测量，使用单片机使整个系统具有极为灵活的可编程性，能方便地对系统进行功能扩展与改进。

By mixing the model of life cycle law and the fast prototype law in the course of systematic development, the system has been fully benefited by I-DEAS variable size driving. The passenger train (hard seat car, hard sleeping car, soft sleeping car, soft carriage) of common use was mutually designed by incorporating the parameter and computer graphics, the three-dimensional, level and section pictures were assigned automatically, the scheme design with parameter and automation was realized.

在系统的开发过程中采用了生命周期法和快速原型法的混合开发模型，充分利用了I—DEAS软件的变量化尺寸驱动特性，集参数化和计算机绘图于一体，通过对通用客车(硬座车、硬卧车、软卧车、软座车)进行交互设计，自动生成三维效果图和平面、断面布置图，实现了铁路客车方案设计的参数化设计与自动化设计。

To realize the analysis of short time of speech signal by Matlab, including the judgement of surd and sonant, the estimate of the pit...

用matlab实现对语音信号的短时分析，包括清音和浊音的判决，基音周期的估计，实验报告。

To realize the analysis of short time of speech signal by Matlab, including the judgement of surd and sonant, the estimate of the pitch and experiment report.

用matlab实现对语音信号的短时分析，包括清音和浊音的判决，基音周期的估计，实验报告。

Experimental results show that the satisfactory effects for pitch track smooth and surd/sonant decision with this method are gotten and the robust pitch determination is realized.

实验表明NCCFPDA算法在基音轨迹的平滑和清／浊判别方面都具有令人满意的效果，能实现基音周期的鲁棒性检测。

This thesis realized a subminiature PKI with core functions according to PKI"s basic principles, which followed the international standard, and referred to some existing products. What"s more, the author also did a detailed investigation of various technical issues during the PKIs implementing, including system architecture, function module, software structure, operation management, certificate life-cycle, trust relation management, and the ways to guarantee its operability and extensibility.

本论文立足PKI的基本原理，遵循其技术标准、参考现有的产品，实现了一个具备核心功能的微型PKI系统，仔细考察了PKI实施中的各种技术细节，包括：系统的体系结构，功能模块、软件架构、运作管理，证书生命周期管理的完整过程，信任关系管理的简单情况，以及如何保证互操作性和可扩展性。

It will improve the development and test of new type weapons with lower cost and less time.

分布式靶试系统是军事仿真领域内的一个新的应用方向，它的实现将对新型武器研制以及试验起到节约成本、缩短周期的效果，有着不可估量的经济效应。

Based on the work thereinbefore, an electronic nose system was designed and prepared using single chip microprocessor , which has been used successfully to classify and recognize three kinds of gasoline and five kinds of distilled spirit within 20min with injection of less than 100μl gaseous sample.

在以上工作基础上，设计并用单片机实现了一个电子鼻系统，已成功地应用于对三种不同标号汽油和五种不同品牌白酒的分类和识别，测试周期小于20分钟，气体样品进样量小于100微升。

Based on the work thereinbefore, an electronic nose system was designed and prepared using single chip microprocessor, which has been used successfully to classify and recognize three kinds of gasoline and five kinds of distilled spirit within 20min with injection of less than l00μl gaseous sample.

在以上工作基础上，设计并用单片机实现了一个电子鼻系统，己成功地应用于对三种不同标号汽油和五种不同品牌白酒的分类和识别，测试周期小于20分钟，气体样品进样量小于100微升。

This project was established based on the first cooperative development of optical in situ real time detecting technique probing the atomic scale layer-by-layer epitaxy growth of oxide film. Over the last three years, we have given full play to the advantages and characteristics of both sides and have finished the assumptions and plans of this subject satisfactorily. 1. In Institute of Physics, we set up advanced oblique-incidence reflectivity difference equipment and wrote one data acquisition procedure that made the simultaneous detection of optical signal and RHEED signal into reality. 2. The first observation of sustained oscillations over hundreds of monolayers in both real and imaginary signals during the epitaxy growth of SrNb0.1Ti0.9O3 on SrTiO3 substrate in LMBE testifies that oblique-incidence is an excellent method to detect and monitor film epitaxy growth real time. 3. For the first time, we verify that oblique-incidence reflectivity difference method can be used to monitor the layer-by-layer growth mode during continuous growth through the correspondence between optical signals to atomic or molecular step edge density on the growth surface. 4. Phenomenological analysis shows that optical signals comprise three parts, the first is proportional to the average thickness of the film and depends on the bulk phase dielectric response; the second is proportional to the coverage of terraces and depends on the dielectric response of atoms or unit cells in the terrace; the third is proportional to the coverage of step edges and depends on the effective dielectric response of atoms or unit cells at step edges. This makes oblique-incident reflectivity difference technique a quantitative macroscopic method to monitor film growth.

中文摘要：本课题是在合作首次发展了氧化物薄膜原子尺度层状外延生长光学原位实时探测方法的基础上立项的，三年来，我们充分发挥双方的优势和特点，圆满完成了课题的设想和计划。1、在物理所建立了一套先进的光反射差法装置，编写了计算机系统的数据采集程序，实现了两路光学信号和RHEED数据的同步采集和显示。2、用激光分子束外延在SrTiO3基底上生长SrNb0.1Ti0.9O3薄膜，首次观测到连续外延几百个原胞层，周期振荡的光反射差实部和虚部信号，证明了光反射差法是一种能原位实时探测与监控薄膜层状外延生长的好方法。3、首次验证了通过对生长表面原子或分子台阶密度的响应，光反射差法可用于原位实时监测在连续生长条件下薄膜的层式生长模式。4、通过唯象理论的研究，证明光反射差信号由三项组成，第一项只与薄膜的平均厚度和宏观光学电介质常数有关；第二项与分子台阶面覆盖度和台阶面上分子层的光学电介质常数有关；第三项与台阶边缘的覆盖度成正比，并和在台阶边缘的分子的有效光学介电常数有关。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。