方波

The tidal wetland sediment appeared the tendency of changing small from sea to land and from bottom to top.

结果表明，潮间带沉积物呈自海向陆和自下向上变细的趋势，一般光滩沉积物粒径〉50μm，盐沼上部沉积物粒径〈25μm；沿岸方向上，茂密盐沼的沉积物较之稀疏盐沼细；盐沼中的流速和波高较之相邻光滩减少50%以上；植物粘附悬沙干重达

This method selects two parameters, energy and variance, as the characteristic parameter of trolley track, and successfully in extracts the feature frequency belt of trolley track vibration. Furthermore, this technology is applied to practical engineering programs and has good veracity and reliability.2. According to the research of this thesis on the trolley tracks\' present data, the status classification of trolley track with normal distribution is presented. This method divides trolley tracks\' situations into five parts and perfects the classifying method of trolley tracks\' mechanical situation.

具体工作如下；1、将小波包分析方法运用到岸桥小车轨道振动信号的分析中，选取能(来源：A65BC0f论c0文网www.abclunwen.com)量与方差作为轨道的振动特征参数，有效提取出铰点部位与非铰点部位的振动特征频段。2、将正态分布原理引入到岸桥小车轨道铰点机械性能状态的划分之中，并用最大熵概率分布加以验证，准确地反映了实际情况，并定义了正态分布诊断准则的状态分级评价的原则和临界点，方便和简化了状态判断的决策过程。

Secondly, we improve Minimum Semi-variance Model with fitting the joint probability density function of rate of return between futures and spot prices based on wavelet density estimation method for improving goodness of fit for the first time.

其次，为提高估计的精度，对最小半方差模型提出了进一步改进，首次引入小波密度估计的方法拟合期现货收益率的联合密度函数，并与经验和正态核密度估计方法进行了比较。

Years (1873～1993) seasonal time series of SOI and NAOI areanalyzed by means of orthogonal wavelet transform.

用正交小波变换方法分析了近121年来季节的南方涛动指数与北大西洋涛动指数的演变特征，结果表明南方涛动指数最显著的变化是周期约为2～7年的年际变化，它们的方差贡献率为55.1%。1920年以前和1960年以后SO年际及年代际变化较强，其余时段较弱。

The quantizer can perform dynamic quantization for wavelet coefficients after the determination of the best quantization steps {qi} that minimize the average mean square error at a given bit rate.

在为DWT 系数确定好一组使给定码率下均方误差最小化的最佳量化步长{qi}后，该量化器将能够实现小波系数的动态量化。

This kind of gratings can be kept in the material for a long time. A mode of molecular reorientation was used to explain the formation mechanism of these gratings and it is well consistent with our experimental results. 3. Three kinds of azobenzene polymers P , P (MMA-co-GY7) and P (MMA-co-GO13) were synthesized by radical polymerization. High-density optical storage and the three-dimension (3D) microstructures in the azobenzene polymer films were presented. Twenty gratings have been stored on the same spot in our material. It is twice as many as the best recording that has been reported. It is the first time, a rectangular microstructure and a complicated double layers nesting six-pointed star microstructure are inscribed in it by using a simple two-wave couple setup.

采用共聚反应设计合成了单偶氮苯聚合物P、双偶氮苯聚合物P（MMA-co-GY7）和P（MMA-co-GO13）三种聚合物，研究了偶氮苯聚合物薄膜中的高密度光学存储和3维微结构，成功的将20套光栅储存在样品中同一个点上，是已有报道的两倍；并首次用简单的2波混频光路在该材料中刻写出长方格子和六角星型的微结构，在制作多重不同周期不同角度的高密度光栅结构实验过程中，发现不同周期光栅的刻写顺序对整个微结构形成的最终结果具有决定性的影响，并用相衬显微镜观察了这些微结构图像。

The fully inseparable bright tripartite entangled state was experimentally generated using the NOPA at deamplification and the linear optical system consisting of polarization beam splitters and half wave plates. The variances of the sum of the amplitude quadratures of the three obtained optical modes and the relative phase quadratures among them is respectively 3. 28dBm and 3. 18dBm below the corresponding Shot Noise Limit.

利用运转于参量反放大状态的NOPA和偏振分束棱镜及半波片，从实验上产生了完全不可分的明亮三组份纠缠态光场，所产生的纠缠态具有三模正交振幅分量和与相对正交位相分量差的起伏方差低于散粒噪声极限的特性。

At half past seven pm on the June 20 Slovakia VS Paraguay Bloemfontein at 22 o'clock on the June 20 Italy VS New 西兰内尔斯普 Reiter at 10:00 pm on the June 24 Slovakia VS Italy Johannesburg at 22 o'clock on the June 24th VS Paraguay New Zealand Polo melon ...

6月20日19：30 斯洛伐克VS巴拉圭布隆方丹 6月20日22：00 意大利VS 新西兰内尔斯普雷特 6月24日22：00 斯洛伐克VS意大利约翰内斯堡 6月24日22：00 巴拉圭VS 新西兰波罗瓜。。。

In 2005, the organizers released a provisional list of thirteen venues to be used for the World Cup: Bloemfontein, Cape Town, Durban, Johannesburg, Kimberley, Nelspruit, Orkney, Polokwane, Port Elizabeth, Pretoria, and Rustenburg.

2005年，主办方公布了13个场地的临时名单，世界杯的使用：布隆方丹，开普敦，德班，约翰内斯堡（2），金伯利，内尔斯普雷特，奥克尼，波洛，伊丽莎白港，比勒陀利亚（2），和勒斯滕堡。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。