特性

Firstly,the generic conception of symmetry for a real sequence was proposed,and then,the symmetry-decomposition and the symmetric degree sequence are presented,which are deduced from the projection theory,the orthogonal-decomposition theory in inner product space and .

首先提出序列信号一般意义下的对称概念，然后由内积空间中的投影、正交分解理论以及内积量化两个信号线性相关程度的特性导出任意信号的对称分解及对称程度序列，对称程度序列定量刻画了信号随对称点的变化时对称特性的变化，在此基础上得出任意序列信号对称程度的定量指标——对称性指标。

Then, we discuss a robust implementation of the pilot-symbol-aided estimator that is insensive to channel statistics. The analysis of these algorithms is made by computer simulation. Finally, combinating with the application of channel estimation , we present two techniques: STBC (space-time block coding) and STTC (space-time trellis coding) to improve the performance of channel parameter estimation.

在基于导频的估计中，研究了基于MMSE下二维导频辅助信道估计，并结合无线信道的统计特性在一般不可知的条件下，给出了一种对无线信道的统计特性不是很敏感的鲁棒的二维导频辅助信道估计器，通过实验仿真证明其有效性。

Under the current experiment conditions, it is difficult to completely understand the characteristics of laser ignition of energetic materials because of instantaneity and complexity of the process. Thus, researchers attach widespread importance to the method of numerical simulation.

由于含能材料激光点火过程的瞬时性和复杂性，在目前的实验条件下难以全面地了解含能材料的激光点火特性，因此用数值模拟方法来分析含能材料的激光点火特性受到人们的普遍重视。

Instantaneous velocity of the fluid-point is measured with LDA in the pipe reactor.

本文主要对管式反应器中流场特性和传质特性两方面进行了较深入的研究。

Also, it has its own particularity of intangibility and regeneration. The character of Shell Company made it an economic resource with special value. The value of Shell Company includes not only the asset value, but also the virtical value. In most cases, the latter will be far beyond the former.

壳公司的特性决定了其作为一种社会资源的价值特性，即壳公司的价值不仅包括其资产价值，也有很大成分的虚拟价值，在一般情况下，虚拟价值还会远远高于资产本身价值。

The results for hollow Gaussian beams propagating through a free space and a focusing lens system are derived in terms of Collins' integral formula.

第三章首次提出了空心光束的新的理论模型，并对该空心光束模型的传输特性和聚焦特性做了详细的理论分析。

A measurement method for insertion loss is introduced, and the results show that the integrated system works well in the measurement of smoke screen at 3mm band.

探讨了该系统的烟幕插入损耗特性测量方法，实验结果表明：该系统能满足3mm波段烟幕特性自动化测量的要求。

This kind of sequences has very high frequency, it also has better characteristic of autocorrelation and intercorrelation. It present a new kind of selecting scheme for spread-spectrum communication.

在本文的最后，我们将讨论一种基于蔡氏电路的混沌扩频序列，这种混沌扩频序列可以做到很高序列脉冲频率，同时它同样具有良好的自相关特性和互相关特性，它为扩频通信提供了一种新的序列选择方案。

Image distortion can be also introduced by interelectrode capacitance and electronic noise.Moreover,the position resolution,image linearity and background rate of detector are tested.

此外，测试了探测器的暗计数率、线性度以及空间分辨率等性能，同时分析了微通道板在光照情况下的增益特性和暗计数的一般特性及其产生原因。

This article analysis the effects of canopy structure: cultivated density and canopy thickness, canopy azimuth angle and gradient, canopy height and interline distance, canopy stretch degree, leaf area coefficient, leaf area density; fruit photosynthesis characteristics: leaf optical characteristics required, changes in law of fruit Pn's season and day; the internal and external effects of photosynthesis; light interception and distribution, the paper puts forward some exiting problems and provides direction for future research.

本文通过对影响叶幕结构的因素：栽植密度与叶幕厚度、叶幕方位角和倾斜度、叶幕高度与行间距离、叶幕开张度、叶面积系数、叶面积密度；果树的光合特性：叶片的需光特性、果树净光合速率的季节和日变化规律；影响光合作用的内、外界因子；光能的截留和分配的分析，提出研究中存在的问题，为以后的研究提供方向。

They go to town. Would you just ask them?

他们在城里你能问他们吗？

Ossein pretreated for a2 weeks period exhibited the maximum% yield incase of bone gelatin, while the yield from intact skin was higher than that realized incase of de-scaled skin.

预处理时间达2星期的骨胶原表现出最高的骨明胶百分产量，然而从未处理鱼皮中得到的产率比去鳞的鱼皮得到的要高。