查询词典 trace form

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。

This thesis tries to search for the shaping and the imagination beyond such a soul, studying the trace of Wu's past works to explore his imagination of races and tribes, and the orbit of his life back to the culture of land, merging with the extended theory of Bildungsroman to analyze the text of his novel.

本论文试图探求这样一具灵魂的背后，他的形成，以及他的想像，用吴锦发过去的文字轨迹，来追寻他的文学成长背后的族群想像与回到土地文化的生命轨迹，融入成长小说的延伸理论来分析他的小说文本。

At this point you may be able to trace the common bile duct to the duodenum.

在此，你可能可以沿着总胆管，找到十二指肠。

The works in the project just done can be summarized as five respects.(1) A device was designed to fabricate the asymmetrical resonant cavities by a pendant drop. A series ARCs with variable parameters provides a valuable experimental method for investigating the characteristics of ARCs.(2) The relationship between the number of active modes and the shape parameters in an ARC was investigated. The experimental lasing threshold was compared with theoretical result, the good agreement between two shown that it was the decrease of the number of active modes in an ARC that decreased lasing threshold.(3) Dye lasing gain was used to enhance the signals of stimulated Raman scattering of the weak gain Raman modes in a circular cavity made by a pendant drop, the instantaneous SRS spectra of weak gain Raman modes in ethanol was obtained by this new method.(4) The SRS signals of minority compound in a binary chemical complex was obtained by using dye lasing gain method. The detection concentration of minority compound was reduced to an order compared with normal SRS method.(5) A cylindrical circular cavity was formed by a liquid jet, which was used to reduce the pump intensity required for laser induced plasma spectroscopy. The limit of detection of trace element in aqueous sample was greatly decreased by this new method.

我们设计并成功制作了使悬垂液滴连续变形的装置，用此装置可以方便地改变非圆对称谐振腔的几何参数，为ARCs的研究提供了一种有效的实验方法；研究了ARCs中活性模式数和变形参数间的变化规律，激光阈值的数值计算结果和激光辐射的实验结果作了比较，二者吻合的曲线说明ARCs中活性模式数量的减少是受激辐射放大阈值降低的原因；在由单元化合物构成的微型圆对称谐振腔中，首次尝试用"激光增益"增强弱增益拉曼模式的受激拉曼散射信号，获得了乙醇分子中弱增益拉曼模式的瞬态SRS光谱；在由二元混合物构成的微型圆对称谐振腔中，用染料的激光增益增强了少量化合物的SRS信号，把少量化合物的SRS信号探测浓度降低了近一个数量级，在SRS应用于瞬态过程的组份分析方面做了卓有成效的探索；用石英毛细管形成的稳定液拄构成拄形谐振腔，降低了激光诱导等离子体光谱需要的激励能量，有效地降低了水相样品的痕量元素分析极限，为LIPS应用于微量元素的化学分析开拓了一条新的技术路线。

This paper reviews the recent technical developments in the determination of trace bisphenol A in environmental and biological samples including sample separation, enrichment and analytical methods.

文章对近年来国内外环境及生物样品中残留双酚A的最新前处理及检测技术的研究进展进行了综述。

This method had certain practical value in the separation and enrichment of trace bismuth.

该方法在微量铋的分离和富集中有一定的实用价值。

A hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition.

一种二价或三价金属元素，坚硬的银白色铁磁体，植物动物营养中的微量元素。

Silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition.

一种二价或三价金属元素，坚硬的银白色铁磁体，植物动物营养中的微量元素。

Cadmium is a bivalent, non-essential trace element and considered as one of the most phytotoxic heavy-metal contaminants.

本文综述了藻类对重金属的耐性与解毒机理，在此基础上研究了铜绿微囊藻生长和光合作用对Cd浓度增加的响应。

Today, he was suddenly on the attack a "black-faced '", so to speak straight, a trace of unhappiness breeding.

今天，他忽然攻上了个"黑脸'"，说话如此之直，一丝不快滋生。

The quality of both red and white wine depends very much on the wine maker talent and on the quality of the grapes.

他的红酒和白酒的品质，根据酿造者的能力和葡萄的质量，各有差异。

No, I don't want to get drunk before my next match.

" "不，我不想让我的下一场比赛前喝醉了。