模数的

Direct digital waveform synthesizer is a digital method that the radar signal is generally generated.The error resource of DDWS is presented.The principle that signal is reconstructed in digital-to-analog converters is analyzed in the DDWS structure.

介绍了直接数字波形合成(direct digital waveform synthesizer，DDWS)的误差来源，分析了DDWS结构中其数模转换器信号重构机理，比较研究了DAC信号重构误差对输出信号脉冲压缩结果的影响。

Displacement computation of cutoff wall of second-phase cofferdam in Three Gorges project,shows that the parameter of unloading modulus in Duncan-Chang nonlinear elastic E-μmodel has a fairish influence on precision of calculation.

以三峡二期围堰计算为例，说明Duncan-Chang非线性弹性E-μ模型中的卸荷模量数 kur对计算精度有一定的影响。

This paper presents the design considerations and implementation of an area-efficient interpolator suitable for a delta-sigma D/A converter.

提出了一种插值滤波器的设计与实现的新方法，并最终将其实现。该方法适合于过采样数模转换器。

The former can provides a shorter path and least action to reach the desired equilibrium point; and the latter proposes a class of linear sliding-mode, which not only guarantees global nonsingular but also uncouples the original control system.

改进的PID控制律保证了闭环系统能够沿最短路径趋于稳态值；解耦变结构控制律直接针对完整的四元数设计一类线性滑模，从而避免了奇异问题，而且对原控制系统解耦。

The company's leading products are: a variety of automotive axle, arm, connecting rod, crankshaft, adjust arm, rocker arm, spherical shell, cross shaft, steering knuckle, semi-axon edge Yokes, Welding fork, slide forks and so on hundreds of types of forging quality specifications.

公司的主导产品有：各种汽车半轴、摆臂、连杆、曲轴、调整臂、摇臂、球壳、十字轴、转向节、半轴突缘、万向节叉、焊接叉、滑动叉等种类数百种规格的模锻精品。

In the past 10 years has produced a period of forging die, die thousands of sets of various molds, is rich in design, manufacturing experience.

在近十年的时间里先后生产锻模、冲模各种模具数千套，具有丰富的设计、制造经验。

These mode centroids substituting for ambient data points were used to simplify the model.

利用模态点代替聚集在其周围的数据点，实现对模型的简化。

Now, we have the basic information, such as: cavity number, product material, moulding machine specifications and steel information etc.

现在，我们有基本的信息，例如：模穴数，产品材料，注塑机资料和模具材料等，但我们还没有标准件的标准，浇口要求和产品表面要求。

The parameters include waveguide width: 8μm, titanium film thickness:50~60nm, index change: 0.006, diffusion temperature: 1050 and diffusion time: 9~10 hours.Designed and produced a 2 X 2 coupler Optical switch and a 1 X 2 digital optical switch. The coupler optical switch was produced by AP reversal structure, with the main parameters such as total length of switch: 30mm, waveguides center distance: Hum, interaction length: 17mm, and at 17V with a crosstalk of -18dB. The digital optical switch was produced by asymmetry electrode Y branch structure. The main parameters of this switch such as switch length: 25mm, the angle of Y branch: 0=0.1? center distance at branch end: 30μm, the center distance of electrons: 12μm, and at 27V with a crosstalk of 18dB.

设计并制作了2×2耦合型光开关和1×2数字开关，其中耦合型开关主要采用的反转Δβ定向耦合器开关，开关长度约30mm，波导宽度8μm，波导间距14μm，耦合区长度17mm，电极主要采用三电极结构，最终测得对TE模开关电压＜-15，消光比≈18dB；数字开关采用非对称电极Y分叉数子开关结构，利用BPM软件模拟了其开关特性并优化了器件参数，制作中采用的主要参数为：开关长度约25mm，Y分叉角θ=0.1°，Y分叉末端波导间距30μm，电极间距12μm，最终测得开关电压27V，消光比≈18dB。

First, according to the tracking error dynamics and kinematics described by unit quaternion error and angular velocity error, a sliding mode controller is derived based on Lyapunov theory.

首先根据由误差四元数和误差角速度描述的跟踪误差动力学和运动学方程，设计了基于李亚普诺夫方法的滑模变结构控制律。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。