差同步

The theory and algorithm of time synchronization about LEO are discussed with the key technique in many ways. On the basis of Bernese 5.0 GPS Software, onboard GPS receivers clock error about GRACE is processed, and the results-specific analysis is computed.

研究了利用星载GPS接收机进行低轨卫星与卫星时间同步，探讨了其中的关键技术，以Bernese 5.0软件为基础，对GRACE卫星的星载GPS接收机钟差进行了解算，具体分析了解算结果。

Asynchronous communication for buses was developed to overcom the worst-case clock rate limitations of synchronous systems.

异步通信。总线的异步通信是为了克服同步系统中极差的时钟频率限制而开发的。

We propose a new resynchronization attack based on the difference performances of combinational functions.

基于组合函数的差分特性，提出了一种新型的再同步攻击方法。

Another resynchronization attack is also proposed, which is the combination of the differential cryptanalysis and algebraic attack.

利用差分分析和代数攻击提出了另一种新型的再同步攻击方法，并利用此攻击方法分析了LILI-128 密码体制。

Examines the impact of frequency difference on synchronous and demodulation, and gives...

研究了频差对同步和解调的影响，提出了解决方案。

The machine applies Faraday magnetic conductivity principle for the first time, utilizes the difference between oxygen of air andnitrogen, paramagnetism of oxygen and diamagnetism of nitrogen principles and adopted high-performance rare-earth permanent-magnet material, which creates 18 proprietary technologies that take polyoxier and helimagnetizer as core.

该机首次应用法拉弟导磁性原理，利用空气中氧、氮磁性之差，即氧的顺磁性和氮的抗磁性原理。采用高性能稀土永磁材料，创造了以"聚氧器"和"螺旋磁化器"为核心的16项专有技术。聚氧器利用氧的顺磁性，采用高梯度强磁场富聚空气中的氧，同时设有与离心叶轮同步高速旋转的双向扫射磁场，对富聚的氧予以充分的激活。

According to pulse oddment counting principle,a pulse signal counting circuit for differential ring lasers is designed based on XC3S400AN,a kind of FPGA chip with high performance.

根据脉冲零头计数原理，应用高性能的FPGA芯片XC3S400AN，基于VHDL结构描述语言，对高精度高频率时钟信号进行时序控制及同步处理，设计出一种四频差动激光陀螺脉冲信号计数电路，并进行了实验测试。

As a differential detection is used between the intercarrier, the proposed algorithm overcome the high sensitivity to timing error of conventional algorithm and is robust to multi-path. The effect of sample frequency offset can't be ignored in a continuous OFDM system of a large number of subcarriers. The estimation precision of the conventional algorithm is low and the realization is complex. A joint estimation of sample frequency offset and fine frequency offset based on difference operation is proposed. As averaging use a large number of samples in a maximum likelihood algorithm, the estimation precision is very high. The use of difference operation cancel the effect of carrier frequency offset, and the proposed sampling frequency estimation algorithm is robust to carrier frequency offset.

最后，本文对连续系统中的采样频率和载波频率精同步技术进行较为深入的研究，由于子载波数目大的连续OFDM传输系统中，采样频率偏差不可忽视，以往的采样频率估计方法精度低、实现复杂，因此本文提出了一种基于差分处理的采样频率偏差和精载波频率偏差联合估计算法，利用了最大似然算法进行采样频率偏差的估计，由于采用了差分处理方法，消除了载波频率偏差对采样频率偏差估计的影响，采用的最大似然算法对大量样点进行平均化处理，所以，相对以往算法，提出的联合算法估计精度高，而且采样频率偏差估计对载波频率偏差具有鲁棒性。

The time to peak systolic longitudinal strain and the time to peak systolic radial strain were derived from the LV apical views , and to peak systolic circumferential strain was derived from the parasternal short axis. The standard deviation for time to peak longitudinal、circumferential and radial strain in the 18 segments (LS-SD18、CS-SD18、RS-SD18) and the maximal temporal difference of any two segments(LS-dif、CS-dif、RS-dif)were calculated as a strain-derived dyssynchrony index.

方法16例慢性心衰患者，获取心尖长轴观测量各节段收缩期纵向应变达峰时间，径向应变达峰时间，胸骨旁短轴观测环向应变达峰时间，计算CRT术后1个月、术后3个月18节段纵向、环向、径向应变达峰时间标准差(LS-SD18、CS-SD18、RS-SD18)、左室各节段收缩期纵向、环向、径向应变达峰时间最大差值(LS-dif、CS-dif、RS-dif)作为应变非同步指标。

Firstly, this paper analyzes the transmission style of diving machine in detail and selects hydrostatic transmission as transmission manner of Heavy Engineering Transporter. Then we analyze the principle of hydrostatic transmission, control style of hydraulic components and the basic driving theory of transporter and pay attention to solve the problems of driving speed-regulation control when transporter runs on different road surface and differential speed control ensured every wheels pure roll when transporter is in swerving.

接着分析了静液压传动的液压原理、静液压传动液压元件的控制方式和汽车行驶理论基础，主要解决了以下控制问题：(1)车辆在不同工况下行驶时，选择不同速度的整车调速控制；(2)车辆转弯时，为确保车轮实现纯滚动，而使各驱动轮按设定规律运动的差速控制；(3)车辆从一坡度过度到另外一坡度时，使每个驱动桥实现同步的桥间差速控制。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。