循环法

First,this dissertation presents a new method of cyclic spectra estimation which uses time aliasing method and sidelobe eliminated ssinc window which were presented by Smith in 1994 in it.

首先，本文将1994年Smith提出的时间重叠法和具有旁瓣抑制能力的ssinc窗应用于循环谱估计中，提出了TA循环谱估计方法。

Continuous ethanol fermentations with and without recycling of distillage were carried out in two suspended-bed bioreactors,respectively,using two-stage enzymatic hydrolyte of corn powder as medium.

在2个单级悬浮床生物反应器中，以双酶法制备的玉米粉糖化液为底物，进行了废液循环条件下自絮凝颗粒酵母乙醇连续发酵与清液发酵对比实验。对于废液循环实验，每隔5d将收集到的发酵液集中精馏处理，得到的废糟液直接用于玉米粉调浆。

They use R/S analytic method to check up earnings yields, and find that both of earnings yields have long memory characteristic. It also performs short memory characteristic along with changes of sample"s initial time and interzone of time series. The average circular period of Shanghai"s stock market is 250 days, and Shenzhens is 400 days.

采用了R／S分析法对收益率进行检验，实验结果表明上证综指收益率和深证成指收益率都有长记忆特征，但随着样本初始时间和样本区间大小的不断改变，股市收益率在表现出长记忆性特征的同时，也表现出了短记忆性的特征；上证综指的平均循环周期为250天，深证成指的平均循环周期为400天。

And also this paper deduced load of tower crane jib according a typical tower crane operating cycle.

通过雨流计数法统计了危险截面应力—时间历程中应力幅和循环次数，根据应力幅和循环次数利用数理统计方法假定了吊臂钢结构在工作过程中的应力幅分布服从对数正态分布，最后通过检验母体是否服从某种分布的

In inner loop,we use a modified conjugate gradient algorithm and a restarted technique; in outer loop, the Morozov's discrepancy principle is used as a stopping rule.

该方法的内层循环采用修改的共轭梯度法，并使用重开始技巧；外层循环使用Morozov偏差准则作为停机准则。

Secondly, according to the spectral correlation theory of second order cyclostationary processes, maximumlikelihood filters are used to estimate the cyclic spectra. By estimating the crossspectra of the two frequency shifted versions of cyclostationary signal, the cyclic spectra can be obtained. The analysis effective bandwidth of maximumlikelihood filters is studied in details. In case of cross-spectra estimation, the analysis effective bandwidth of maximum-likelihood filters is not correct. A new method to calculate the analysis effective bandwidth is presented.

第二，根据二阶周期平稳随机信号的谱相关理论，提出了循环谱密度估计的最大似然滤波器法，即采用最大似然滤波器估计出周期平稳信号的两个频移分量之间的互谱密度，从而得到了循环谱密度的估计；对最大似然滤波器的有效分析带宽做了详细的分析，指出了在互谱密度估计时以往的有效分析带宽不正确，并提出了互谱密度估计时的有效分析带宽的新的计算方法。

Gastric PCO2 was measured from a nasogastric tube by an automated system of air tonometry.

目的 观察体外循环中空气法胃粘膜pH值与氧供、氧耗的变化了解体外循环期间胃粘膜的血流灌注。

Methods Thirty elective cardiac surgery patients were observed. Gastric PCO2 was measured from a nasogastric tube by an automated system of air tonometry.

目的 观察体外循环中空气法胃粘膜pH值与氧供、氧耗的变化了解体外循环期间胃粘膜的血流灌注。

We studied trivalence chromium ion electrode reaction on three different surface state by cyclic voltammetry, discussed electrode activation influence on electrode reaction, and analysed the mechanism of electrode reaction. We discussed current efficiency during the first charge process and charge/discharge cycle performance by invariable current charge method.

应用循环伏安法考察了三价铬离子在三种不同表面状态石墨电极上的电极反应，探讨了电极表面活化处理对三价铬离子的电极反应的影响，并分析了电极反应的机理；采用恒电流充电的方法探讨铬液流电池初次充电过程的电流效率及恒电流充/放电循环的性能。

It was proposed in the 1960's and developed rapidly in the 1990's. However, some theory problems, for example, the fluid dynamics and mass transfer during the filling up period which could not be dealt with in conventional distillation theories has been remained unstudied. And the simulation and mathematical models have to be made based on some assumptions, which are different from the actual situation obviously. Therefore the further development of DACO was restrained in the past years.

该操作方法自20世纪60年代提出，90年代以来得到了迅速发展，但众多学者的研究基本上集中在优化操作及其与传统恒回流法的比较，而许多重要的基本理论问题至今缺乏研究，特别是传统精馏理论无法涉及的塔内无回流充液阶段的流体力学和传质问题一直没有得到很好解决，导致了动态累积循环操作法的数学模型和模拟计算只能以与塔内真实状况相差很大的简化假设为基础，这严重地阻碍着动态累积循环操作法的进一步发展。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失