查询词典 convenience sampling

The results showed that a significant positive association was observed at the sampling levels of 50 m^2, 100 m^2, and 250 m^2 quadrates, and a sampling size of 100 m^2 was more suitable than that of 50 and 250 m^2 for the inter-specific association analysis.

结果表明：20个乔木种群在抽样面积分别为50、100和250平方公尺3种取样水平上均表现为显著的正关联，但取样面积为100平方公尺，比50平方公尺和250平方公尺更为合适。

Soil sampling is carried on on the typical slopes, and the mountain slope location that is being researched is divided into three parts: upper slope, middle slope, lower slope, and three land use ways are selected respectively in each slope location(altitude, slope gradient and aspect are same on the whole): farm land,, reforested land, waste land are taken as sampling sites.

土壤采样选取典型坡面进行，把研究的山体坡位分为3个部分：上坡位、中坡位、下坡位，在每个坡位(海拔高度、坡度及坡向基本一致)分别选取3种土地利用方式：坡耕地、人工林、荒草地作为采样点。

Results The linearity range was 5~500μg/mi. The linear regression formula was Y=5.9601 X -1.643, r=0.9998. The limit of detection was 0.5μg/ml. The minimum detectable concentration was 0.04mg/m^3 (60 L sampling volume). The sampling efficiency was 100%. The sample could store at least 5 days in absorption pipette.

结果 所建方法的线性范围5~500μg/ml，回归方程Y=5.9601 X-1.643，r=0.9998；方法检出限0.5μg/ml，最低检测浓度为0.04mg/立方公尺（采样体积60L计）；采样效率达100%；样品在吸收管中可稳定5d。

Taking the pulse\'s characteristic of low duty cycle into account, we use multi-phase sampling clock synchronization method, to reduce the single-route sampling rate.

综合上面的信号检测方法、AGC方法以及同步方法，为IR-UWB无线系统的低成本、小型化、低功耗接收提供了一个完整的解决方案。

Modern cylinder pressure acquisition system is deeply affected by the advanced computer hardware technology. A/D card with the capabilities of high resolution, high sampling rate, non discrepancy and setting sampling rate at will is combined with a lot of excellent measuring equipment such as crank shaft angle encoder, charge amplifier, industrial control computer, etc.

高速发展的计算机硬件技术深刻影响着现代气缸压力数据采集系统的发展，高分辨率、高采集率、多通道、无相差和可以任意设定采样频率等特性的A/D板卡及一大批性能优越的相关测试仪器如转角信号发生器、电荷放大器、工控计算机等。

A computerized welding arc spectrum information sampling and processing system are developed to study of the ultraviolet spectrum distribution feature. Corresponding softwares also is developed. A process for sampling the ultraviolet spectrum automatically and the real-time monitoring of welding parameter are realized. based on the principles of the physics of arc and spectroscopy the information of welding arc ultraviolet spectrum sampled is changed and processed.

焊接电弧紫外光谱信息的计算机采集与处理系统*韩国明吴钊柳刚云绍辉李俊岳摘要以焊接电弧紫外光谱的分布特征为研究对象，研制了一套焊接电弧紫外光谱计算机采集与处理系统并开发了相关软件，实现了紫外光谱采集过程的自动化、焊接电流与电弧电压的实时监测，并在电弧物理和光谱学原理的基础上，对采集的焊接电弧紫外光谱信息进行变换和处理。

The data source based on the second soil survey in year of 1982 and repeated soil sampling in year of 2003, and the methods for sampling, determining and analyzing of SOC are auger hole method, K_2Cr_2O_7 oxidation method, area-weigh method respectively, and micro-pipette method is used to determine soil texture....

SOC数据来源于1982年土壤普查和2003年重复采样，土样的采集、分析和统计方法分别为土钻取土法、重铬酸钾氧化法、吸管法和面积加权法。

Base on this analysis, a method is designed to improve the measurement brake force precision and repetition in the brake tester. By choosing a suitable sampling number, applying signal processing and optimizing sampling rate, the braking force measurement had higher precision and repetition.

分析了国内目前常用的制动台力学特性，并在此基础上，讨论了提高制动台测量制动精度和重复性的方法，通过选取合适的当量点数、信号处理和优化的采样速度，使制动力测量有较高的精度和重复性

The mechanics specific properties of the brake testers commonly in use have been analyzed. Base on this analysis, a method is designed to improve the measurement brake force precision and repetition in the brake tester. By choosing a suitable sampling number, applying signal processing and optimizing sampling rate, the braking force measurement had higher precision and repetition.2. The object-oriented method is applied hi designing computer control system of MVSPIL. A real-time, multitasking control system is designed and implemented using proper time-slicing algorithm.

分析了国内目前常用的制动台力学特性，并在此基础上，讨论了提高制动台测量制动精度和重复性的方法，通过选取合适的当量点数、信号处理和优化的采样速度，使制动力测量有较高的精度和重复性； 2、将面向对象的方法用于检测线计算机控制系统的设计之中，通过合适的时间片设计，实现了多任务的实时控制系统。

Moist the test paper with distilled water (It is easy for the virus to paste on the test paper), and then rock the cotton swab in the Eagle's liquid back and forth, if you see a muddy turbid, indicating sampling success; if the sample liquid is clear, then sampling may be failure.

我们这个调查的目的是赶在世博会之前，为老年人免费注射疫苗做准备的，但就目前的汇总情况来看，与方案预定的目标存在很大差距，领导很不满意，请大家抓紧，能加快入组，争取在10月底前彻底结束，11月份开总结会议。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。