查询词典 methods of sampling

Then,according to the characteristics of LER measurement and characterization method,the influence factors of LER measurements using AFM,including the nonideal properties of the sizes and shapes of probe tips,the signal noises of AFM images,scan sampling intervals,the driving precision of piezoelectricity,cantilever oscillation and the free parameters of edge detection algorithm and so on,are analyzed theoretically and experimentally,and the methods for restraining and amending the measuring errors are respectively proposed.

然后，根据线边缘粗糙度测量与表征的特点，对各种影响因素，包括探针针尖尺寸与形状的非理想性、AFM扫描图像的噪声、扫描采样间隔、压电晶体驱动精度、悬臂梁振动以及线边缘检测算法中的自由参数等进行了理论和实验分析，并分别提出了抑制及修正的方法。

For the minimum dry density test of sand, test devices are improved to simplify the procedures and the test steps are adjusted to reduce the measurement error. The reverse graduated cylinder method and the tilting graduated cylinder method are recommended as the best methods for minimum dry density test and for leveling sand surface respectively. The optimum sampling quantity and the times of reversing graduated cylinder are studied.

对最小干密度试验，改进了试验装置以简化操作手续；调整了试验步骤以减小测量误差；推荐只使用量筒倒转法测量，用量筒倾斜法整平砂面；研究了最佳取样量和量筒倒转次数。

First, mathematical foundation of synchronization, i.e. the theory of parameter estimation is introduced. Then, DA/DD or NDA timing synchronization methods based on the ML estimation of timing parameter are presented. They are all widely applied in actual digital communication systems. Interpolation theory in digital signal processing has application in timing synchronization, which makes the sampling clock independent of the timing control so that timing adjustment is realized completely through digital disposal. The issue of interpolation in timing synchronization is discussed.

首先，介绍了定时同步实现的数学基础，即信号参数估计理论；从定时参数的最大似然估计出发，介绍了基于数据辅助的定时同步方法和基于非数据辅助的定时同步方法，他们在实际的数字通信系统中均有广泛应用；论文探讨了数字信号处理中插值理论在定时同步中的应用，它使得接收端的采样时钟独立于定时控制，定时调整完全通过数字处理方法得以实现。

Provide a comprehensive inspection and sampling inspection methods, such as flexible, easy to grasp the macro level Cong quality data and detailed analysis of each type of error

提供全面检查和抽检等灵活检查方式，便于丛宏观上把握数据的质量情况，并能详细分析每一种错误类型

Methods A resident （≥ 5 years） group of 30 214 people aged ≥35 years in seven small towns of Liaoning province was investigated by duster multistage and mandom sampling.

目的了解北方农村地区成年人群冠心病的流行病学特征和相关危险因素，为北方农村地区冠心病的防治和干预接供科学依据。

Methods A total of 6 352 students were chosen by multi stage randomized sampling, the information of the students aged 7-8 were collected by face to face interview, students aged 9-18 by self administered questionnaire. Results The incidence rate of injury was 48.0%, and there were 30.4% of the students reporting had committed injury. Every injury case had 1.58 injuries during one year averagely.

用4阶段分层随机整群抽样方法抽取大城市、中小城市、一类农村和二类农村各3个县区进行调查，每个县抽取1所学校，共对6 352名学生进行调查，小学一、二年级学生面对面访谈，三～六年级学生在调查员和老师的指导下完成，初、高中生自填。

Methods The osmolality of sodium hyaluronate gels with sodium hyaluronate concentration of 0.5%, 1.0% and 2.3% respectively were determined by VAPRO 5520 pressure osmometry. The sampling system with pipette or weighing method was compared.

用VAPRO 5520渗透压仪分别测定0.5%，1.0%和2.3%透明质酸钠凝胶渗透压；比较0.5%透明质酸钠凝胶称量加样与取样器加样的测定结果。

The instrument simultaneously sample for three phase voltage and current. Rotary photoelectric coding switch and LCD are used for human-computer interaction. it makes the interface compact and efficient. Utilizing the function of positive and negative edge trigger of the programmable counter array unit in MPU, signal zero-cross is captured for the phase detected based on double way. The software synchronism sampling method based on real-time parameter self-optimizing minishes period truncation error, and the measurement accuracy is improved. The digitization power measure imports traditional two-unit and three-unit methods and expands application range of the instrument. The capacity is discriminated by soft ware table-look-up on the load loss. The value of a quantity is converted to the value when reference temperature (75 ℃) from test temperature.

该仪器具有以下特点：仪器对三相电压电流同时采样；基于旋转式光电编码器和液晶显示屏的人机交互界面简洁而高效；可编程计数器阵列PCA"捕获"信号的过零点用于双向过零平均鉴相，得到准确的相位差和周期；基于实时参数自寻优的软件同步采样，有效地减小了周期截断误差，提高了测量准确度；数字化功率测量引入了传统的二表法和三表法，扩展了仪器的使用范围；实际容量根据负载损耗用软件查表的方法来判别；测量值已从试验温度折算到了参考温度(75℃)时的值。

Methods Stratified random proportional sampling method was used to interview undergraduate students. Version 3.0 of the Composite International Diagnostic Interview of World Health Organization (WHOCIDI3.0) was applied for investigation.

应用分层按比例随机抽样的方法，采用世界卫生组织复合性国际诊断交谈表3.0(WHOCIDI3.0)对在校本科生进行访谈。

Methods. A total of 1461 (669 females and 792 males; age range, 16 to 69 yr) workers were selected through a representative population survey (7,597,386 Taiwanese workers) in 1999 from the Taiwan Bureau of Labor Insurance by proportional probability sampling.

研究样本系以等机率抽样方式自1999年台湾地区劳保资料库（抽样母群体包括7，597，386位台湾劳工）抽出，总计有1461笔样本（669位女性与792位男性），年龄介於16至69岁。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。