Of, the structural periodicity (the number of base pairs per turn of the double helix).

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Based on the study of chronology and geochemistry of Cd in sediments of the Dongting lake area, we have established an ARIMA model of Cd and Cd/Ca in Quaternary and Holocene period respectively, and discussed Cd evolutionary regularity according to the fitted value and predicted value of the model The results revealed that the Cd evolution has remarkable periodicity of ecogeochemistry cycles, and is correlated with the climate change of alternative cold and warm Cd/Ca is changed with climate, from which the evolutionary history of regional ecogeochemistry can be inferred The changes of Cd and Cd/Ca are basically simultaneous, which showed that the change of Cd is mainly a natural evolution Cd in sediments will rise in the next 30 years and then tend to decrease From the regularity of ecogeochemistry indexes and global environment variation, it is concluded that the natural environment is the dominant factor affecting the Cd deposition

在對洞庭湖區(qū)沉積物鉆探取樣的年代學和地球化學研究基礎上内射网站，分別建立第四紀和全新世時期Cd和Cd/Ca的時間序列演化ARIMA模型免费成年人在线看，并據(jù)模型的擬合值及未來預測值對區(qū)域地球化學環(huán)境中Cd的演化規(guī)律進行了探討，結(jié)果顯示區(qū)內(nèi)Cd的演化有較顯著的周期性--環(huán)境地球化學旋回日韩乱码无码中文视频，與氣候多次冷暖的交替有關AV美女激情在线；沉積物Cd/Ca受氣候環(huán)境等控制，分析該比值的變化規(guī)律可推測區(qū)域環(huán)境地球化學的演變歷史国内精品国产免费观看一级A片；Cd和Cd/Ca兩者的變化基本同步国产AV无码宅吉看久久久久久，說明該區(qū)Cd的演化主要為自然演化；未來30年內(nèi)沉積層的Cd含量仍有逐漸增高的趨勢漂亮人妻18P，之后轉(zhuǎn)為降低野狼社区精品。從本區(qū)環(huán)境地球化學指標的時間變化規(guī)律及其與全球環(huán)境變化的相關聯(lián)中說明自然條件是區(qū)域鎘等元素沉積的主控因素。

Normal speech, speech with pitch dithering and speech background noise have been used to test the performance of the optimized algorithm, Speech signal after processed by both proposed algorithms presented obvious periodicity in time domain.

我們設計了普通語音caopor超碰在线、基音有抖動的語音和帶有噪聲干擾的語音來檢驗優(yōu)化算法的性能国产在线不卡免费AV网站。

As the results suggest that, during the period of 1800～2005, the 82-year and 48-year quasi-periodic components are available for the secular variation of dipole magnetic field, which are not directly related to the periodicity of the length-of-day variation.

結(jié)果表明，1800～2005年期間欧美日韩一区二区网站，偶極子磁場長期變化有82年和48年準周期分量激情偷乱人伦在线视频，它們與日長變化的周期沒有直接關系。

The characteristics of different implementation of the fiber-optic pulse replicators based on different techniques are compared according to the different performance requirements of insertion loss, periodicity and power stability of the output pulses in various applications.

針對常用的多路高速光脈沖復制系統(tǒng)可能的實現(xiàn)形式進行了研究黄色AV网络在线，根據(jù)各種應用中所需的插入損耗天天拍日日、輸出脈沖周期性與功率穩(wěn)定性等性能要求，對多種光纖光脈沖復制結(jié)構的特點進行了分析比較情欲网址。

There are many fluid-structure coupling systems with rotationally periodicity in engineering.

工程中存在大量的具有旋轉(zhuǎn)周期性的流固耦合系統(tǒng)性生活视频一级片，為了保證該類系統(tǒng)在使用中的安全性及可靠性，有必要對其進行流固耦合動力分析经典A片免费观看视频。

There are many fluid-structure coupling systems with rotationally periodicity in engineering. It is necessary to do the fluid-structure coupling analysis on this class of system in order to ensure their safety and reliability.

工程中存在大量的具有旋轉(zhuǎn)周期性的流固耦合系統(tǒng)国产免费A片在线网址，為了保證該類系統(tǒng)在使用中的安全性及可靠性，有必要對其進行流固耦合動力分析日本三级a网站。