在数字上

Especially, the technology of Automatic Gain Control and signal processing are studied which are key factors working on the performance of the receiver. Based on analyzing the theory of automatic Gain Control, operational amplifiers 0P37 and logarithmic D/Aconverter AD7111A are used to design variable gain amplifiers which can be controlled numerally, A/D convector LTC1405 is Used to test the echo, Complex Programmable Logic device is used for controller, and an arithmetic is designed for automatic Gain Control which is simulated and analyzed in order to test its feasibility.

本文在分析自动增益控制AGC原理的基础上，采用集成运放OP37和数控增益衰减器AD7111A设计可数字控制的可变增益运放模块；采用高速A／D转换器LTC1405作为回波信号检测模块；采用复杂可编程逻辑器件CPLD作为核心控制模块，构成数字自动增益控制电路，并设计粗调和细调步进控制相结合的算法，对回波信号的增益进行精确而快速的调节控制，使回波信号振幅快速稳定在设计指标范围内，利于接收机后续信号处理电路对回波信号作进一步的处理。

GSM-R is the private mobile communiciation system for railway, which is based on the ETSI GSM,the second generation of mobile communiciation system, It has already come into use in Europe.

GSM-R是ETSI在第二代数字移动通信GSM标准的基础上，经过十多年的技术条件制定、测试和认定推出的一个针对铁路的专用数字移动通信标准，其在欧洲已投入使用。

In the period of aerodrome construction project geology reconnaissance, highresolution orthomap of working area, 3D Remote Sensing Virtual Reality and animation of planned aerodromes are made with the technologies of Remote Sensing digital image process, Virtual Reality and digital photogrammetry. By information extracting and comprehensively assessing on the geognosy, engineering geology, environment geology and ecoenvironment of work area, scientific foundation can be offered to deciders and workers of aerodrome.

在机场建设工程地质勘察中，应用"3S"技术，通过遥感数字图像处理技术、虚拟现实和全数字摄影测量等高科技，制作测区的高精度正射遥感影像地图以及各个拟选机场的遥感图像三维虚拟动态系列动画图，在此基础上进行场区的构造地质、工程地质、环境地质以及生态环境等特征信息提取和综合评价，为机场建设工程决策者和具体的工作者提供科学依据。

In the period of aerodrome constmction project geology recottitaissance, high-resolution ortho-map of working area, 3D Remote Sensing Virtual Reality and animation o planned aerodromes are made with the technologies of Remote Scttstng digital image process, Virtual Reality and digital photogrammetry. By information extracting and comprehensively assessing on the geognosy, engineering geology, environment geology and eco-environment of work area, scientific foundation can be offered to deciders and workers of acrodrome.

在机场建设工程地质勘察中，应用"3S"技术，通过遥感数字图像处理技术、虚拟现实和全数字摄影测量等高科技，制作测区的高精度正射遥感影像地图以及各个拟选机场的遥感图像三维虚拟动态系列动画图，在此基础上进行场区的构造地质、工程地质、环境地质以及生态环境等特征信息提取和综合评价，为机场建设工程决策者和具体的工作者提供科学依据。

So, a novel machine learning based digital blind audio watermarking scheme in the wavelet domain is proposed in this paper, which could find a reasonable balance between the robustness and inaudibility of the watermark, then have the better robustness and inaudibility.

本文正是将小波变换应用到音频信号的数字水印系统中，提出一种小波域上基于机器学习方法的新的数字音频盲水印算法，使其能在水印的鲁棒性和不可感知性之间寻找到合理的平衡点，从而具有更良好透明性和鲁棒性，并在音频作品的版权保护中能有一定的实用性。

At last, a method on creation and calculation of a kind of irrational number is researched. The digit number of the extension of this irrational number is random on certain basis. Therefore, a stream cipher is designed, which uses the extension digit of the irrational number as the key stream.

最后本文在研究一种无理数的生成方法和计算方法的基础上，利用该类无理数在某基底的展开序列中各个位的数字具有良好的随机统计特性的特点，提出了一种以这类无理数的展开数字流作为密钥流的序列密码设计方法，并对生成的密钥流的统计特性进行了分析和测试。

Under its mercurial and visionary boss, Steve Jobs, it has already done this three times. In 1984 Apple launched the Macintosh . It was not the first graphical, mouse-driven computer, but it employed these concepts in a useful product. Then, in 2001, came the iPod . It was not the first digital-music player, but it was simple and elegant, and carried digital music into the mainstream. In 2007 Apple went on to launch the iPhone . It was not the first smart-phone, but Apple succeeded where other handset-makers had failed, making mobile internet access and software downloads a mass-market phenomenon.

在史蒂文·乔布斯这位善于变革，富有远见卓识的老板带领之下，苹果已经进行了三次这样的改变。1984年，苹果发布了Macintosh，这并不是第一台可以绘图、采用鼠标的电脑，但它融入了很多新的概念。2001年，iPod横空出世，这也不是第一部数字音乐播放器，但是它简单、优雅，将数字音乐带入了主流。2007年，苹果发布了iPhone，这依然不是第一部智能电话，但是它成功地在其他手机制造商惨遭失败的市场上畅销，使得手机网络接入、软件下载进入了一个巨大的市场。

The step motor can receive digital signal directly and has the ability to response outer environment immediately and has no accumulation error, which often is used in driving system. In this driving system, open-loop control system is composed of stepping motor, which can satisfy the demand not only for control precision but also for the target of economic and practicality. On this basis , the analysis of stepping motor in power calculating and style selecting is also given.

由于步进电机能够直接接收数字量，响应速度快而且工作可靠并无累积误差，常用作数字控制系统驱动机构的动力元件，因此，在驱动装置中采用由步进电机构成的开环控制方式，这种方式既能满足控制精度的要求，又能达到经济性、实用化目的，在此基础上，对步进电机的功率计一算及选型问题经行了分析。

"We have about 2.47 million estimated cases which is huge in terms of numbers," Health Minister Anbumani Ramadoss told a news conference."In terms of human lives affected, the number is still large, in fact very large. This is very worrying for us."

&我们估计拥有247病例，这是一个庞大的数字，&卫生部长Anbumani Ramadoss在一次新闻会议上说道，从对人类生命的影响上讲，这个数字仍然巨大，而且实际上非常巨大，这令我们十分忧心。

SMD-MC34119 Pinout: C Three External Clock Inputs, Two Multi-purpose I/O Pins per Channel C Double PWM Generation, Capture/Waveform Mode, Up/Down Capability One Four-channel 16-bit PWM Controller One Two-wire Interface C Master Mode Support Only, All Two-wire Atmel EEPROMs Supported One 8-channel 10-bit Analog-to-Digital Converter, Four Channels Multiplexed with Digital I/Os IEEE 1149.1 JTAG Boundary Scan on All Digital Pins 5V-tolerant I/Os, including Four High-current Drive I/O lines, Up to 16 mA Each Power Supplies C Embedded 1.8V Regulator, Drawing up to 100 mA for the Core and External Components C 3.3V VDDIO I/O Lines Power Supply, Independent 3.3V VDDFLASH Flash Power Supply C 1.8V VDDCORE Core Power Supply with Brownout Detector Fully Static Operation: Up to 55 MHz at 1.65V and 85C Worst Case Conditions Available in a 64-lead LQFP Package

SMD-MC34119引脚说明： C款三输入外部时钟，两个多用途I / O引脚每通道双PWM生成，捕获/波形模式，上/下能力的一个四通道16位PWM控制器一两线接口C中间模式支持，只有在所有两线Atmel公司的EEPROM支持的一个8通道10位模拟数字转换器，四通道复用数字I / O的IEEE 1149.1 JTAG边界扫描所有数字引脚5V容限I / O口，其中包括4大电流驱动I / O线，最多一六毫安C镶嵌每个电源1.8V的稳压器，绘图高达100的核心和外部元件 3.3 VDDIO毫安I / O的电源线，独立电源3.3V的VDDFLASH闪光 1.8 VDDCORE核心电源掉电检测与全静态工作：高达55兆赫和85℃时为1.65V最恶劣条件下以64引脚LQFP封装

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。