查询词典 systematic sampling

For the optical system with circular apertures,it is difficult to get the boundary radical slope of phase and the accurate sampling value in the circular domain boundary when the intensity transport equation is used to recover the original phase.

1引言相位恢复是指利用光束传播时所探测到的光强信息反演出相位[1]，为了获得更多的光强信息以把相位恢复到最佳，一次光强测量是不够的，因此这就要求在光学系统的输出或成像光轴方向上进行多次光强测量。

Phosphor change 1.2 helminthic agents steel of aluminous tablet; is bottled carbon dioxide gas. 1.3 circumfluent equipment and tray of testing instrument stainless steel a certain number of;CHXY100/65-Ⅲ movable type are circumfluent detector of chroma of gas of phosphine of;HL-210 of equipment of fuming or steaming-treating diseases with fumes as in moxibustion or with steam generated by boiling medicine herbs. 2 experiments method 2.1 install bug basket and dot of phosphine gas sampling to offer bug trying a storehouse to be mixed in experiment storehouse respectively contrast collect inside the storehouse, choose, every storehouse cent installs 3 bug basket, place respectively in: Pay Yan Xing bing4 ru4 gao1huang1 ③ of number of place of the 4m below cover of food of northeast part of caboodle of grain of; of ② of number of the 2m below cover of food of part of southeast of caboodle of grain of; of ① of number of this Chang?

两仓熏蒸试验时的条件见表1.1.2杀虫药剂56%磷化铝片剂；钢瓶装二氧化碳气体。1.3环流设备和检测仪器不锈钢托盘若干；CHXY100/65-Ⅲ移动式环流熏蒸设备；HL-210磷化氢气体浓度检测仪。2试验方法2.1设置虫笼和磷化氢气体取样点供试仓虫分别在试验仓和对照仓内采集、筛选，每仓分装3个虫笼，分别放置在：粮堆中心粮面下50cm编号①；粮堆东南角粮面下2m编号②；粮堆东北角粮面下4m处编号③。

In the scheme, we use a path time delay estimation method to improve the accuracy of the correla- tion based symbol synchronization methods, and use a tracking loop to lock the symbol synchronization and to track the sampling clock.

在该算法中，我们使用一种路径时延估计的方法来提高基于相关算法码元同步的准确性，并采用一个跟踪环路来锁定码元同步和跟踪采样时钟。

Methods:From 1987 to 1992,hospital-based cluster sampling method was adopted for collecting data.

采用以医院为基础的监测方法收集资料。

A total of 15 838 nationally representative subjects aged 35 to 74 were selected with multistage cluster sampling.

共调查了35～74岁的成年人15 838人。

The samples were collected by way of cluster sampling and 798 were available.

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Methods Stratified random and cluster sampling methods were employed in this study.

正确使用安全、可靠的避孕方法是降低意外妊娠的关键。

Methods Cluster sampling method was used in the 717 persons aged 60 and over in Yanjiao Developing Area.

采用整群抽样方法对河北省燕郊年龄≥ 6 0岁 717名老年人进行问卷调查。

Cluster sampling and questionnaire of traffic safety consciousness of school students in Shanghai were conducted in this study.

采取整群抽样的方法，同时采用统一编制的"上海市中、小学生交通安全知识认知调查表"进行调查。

Methods Cluster sampling was used, and epidemiological investigation was carried by means of questionaires.

采用整群抽样的方法，运用自编的调查表进行流行病学调查。

When this condition occurs, inbound replication with the source partner is stopped on the destination domain controller and event ID 2042 is logged in the Directory Services event log.

计算机密码学是研究计算机信息加密、解密及其变换的科学，是数学和计算机的交义学科，也是一门新兴的学科。

Instructions: click on the thumbnails to see a larger image, then use the left-right arrow keys to scroll through the slideshow.

使用说明：滑鼠点在小图上即可放大观赏。开启后键盘左右键可用来换照片。