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The performance of EFT is investigated, which indicates that time-frequency distributions using single-sided window could not accurately trace the variation of the instantaneous frequency, since their performance depend only on the history of the signal, so they are biased frequency estimator.

提出了基于对称阵元互Wigner分布平均的瞬时频率估计算法，这种方法利用多通道数据对时频分布的瞬时频率估计方法的性能进行了有效的改善，并且能够在低信噪比的条件下获得良好的估计效果， 6。

Failure mechanisms and rules were investigated on the base of biaxial experimental researches on mechanical properties.

在双向力学性能试验研究的基础上，对帘线／橡胶复合材料的双向拉-拉失效机理和失效规律进行了研究。

The effects of the composition of catalyst (the structure and amount of bident ligand and strong acid, the cocatalytic activity of Cu〓, the roles of methanol and phenol etc.) and the copolymerization condition (the reaction time, temperature, amount of ST and CO, the structure and amount of solvent etc.) on catalytic activity were studied. The principle of the copolymerization was investigated.

研究了催化体系组成（含氮双齿配体的结构与用量、强酸的结构与用量、铜盐的助催化作用、甲醇和酚类化合物作用等）和共聚反应条件（共聚反应的温度与时间、溶剂种类与用量、苯乙烯与一氧化碳量等）对溶液共聚反应的催化活性的影响，探索溶液聚合反应规律。

In this thesis, the limit cycles bifurcated from some kinds of polynomial systems are investigated using the methods of bifurcation theory and qualitative analysis.

本文利用分支理论和定性分析的方法，借助于计算机等辅助工具对几类多项式系统的极限环分支问题进行了研究。

The two-parameter unfoldings of local dynamical behavior,near the point of Hopf-Hopf bifurcation, is investigated theoretically.

理论分析了四维范式映射在Hopf-Hopf余维二分岔点附近的参数开折。

In chapter 3, the stability and bifurcation of the equator of a cubic system are investigated.

在第三章中，我们研究一类三次系统的赤道环的稳定性和极限环分支问题。

The effect of processing conditions, starch and food gums on the gel strength and folding ability of fish balls made from bighead carp was investigated.

研究了加工条件、淀粉、食用胶对鳙鱼鱼丸凝胶强度和耐折度的影响。

In this study, we investigated the reproducibility of SE measurements simultaneously obtained from bilaterally applied electrodes in the same patient.

在这次研究中，我们通过测量应用于同一患者两侧的不同电极同时获得的状态熵来研究其可重复性。

The composition and the antioxidant activity of bog bilberry polyphenol extract as well as its anthocyanin components were investigated.

研究笃斯越桔多酚提取物的成分、花青素组分和抗氧化能力。

In this paper, the stability problems of two forms about the discrete singular bilinear system with time-delay are investigated.

针对两类不同形式的滞后离散广义双线性系统的稳定控制问题进行了讨论。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。