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相关概念视频

Sampling Plans01:23

Sampling Plans

165
Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
165
Sampling Methods: Overview01:06

Sampling Methods: Overview

272
A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of...
272
Random Sampling Method01:09

Random Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest. Among the various sampling methods used by...
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Convenience Sampling Method00:55

Convenience Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population.
Convenience sampling is a non-random method of sample selection; this method selects individuals that are easily accessible and may result in biased data. For example, a marketing...
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Cluster Sampling Method01:20

Cluster Sampling Method

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Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a cluster sample, divide the population into clusters (groups) and then randomly select some of the clusters. All the members from these clusters are in the cluster sample. For example, if you randomly sample four departments from your...
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Systematic Sampling Method01:17

Systematic Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
Systematic sampling is one of the simplest methods...
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相关实验视频

Updated: Jun 3, 2025

Simultaneous Data Collection of fMRI and fNIRS Measurements Using a Whole-Head Optode Array and Short-Distance Channels
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有效的数据采样方案,以缩短统计ALCHEMI的获取时间.

Akimitsu Ishizuka1,2, Masahiro Ohtsuka1,3, Shunsuke Muto1,3

  • 1Department of Materials Physics, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.

Microscopy (Oxford, England)
|January 13, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种通过道增强微分析 (ALCHEMI) 来确定原子位置的有效采样方法,以显著减少实验时间. 这项新技术准确地确定了材料中的剂分布,将测量时间缩短了100倍以上.

关键词:
炼金术 (Alchemy) 是一种化学方法.补充剂使用地点占用率.边缘检测 边缘检测 边缘检测光X射线分析分析传输电子显微镜的使用波形变换波形变换波形变换.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 分析化学 分析化学

背景情况:

  • 宿主晶体中的多潘特分布对材料性能产生了重大影响.
  • 精确确定剂位置对于材料优化至关重要.
  • 通过道增强微分析 (St-ALCHEMI) 进行统计原子定位是一种强大的技术,但可能耗时.

研究的目的:

  • 制定一个方案,以有效地选择St-ALCHEMI的采样点.
  • 为了缩短用于多分布分析所需的实验时间.
  • 为了保持或提高多分发的准确性.

主要方法:

  • 根据数据冗余的理论和实验分析,推导了用于选择光束方向的指南.
  • 确定了光束方向,主体电离道模式的变异较大,相关系数较低.
  • 应用了一个边缘检测方案,使用双树复杂波纹转换到电子通道模式.

主要成果:

  • 拟议的采样策略显著减少了实验时间.
  • 开发的方案可以减少至少两个数量级的实验持续时间.
  • 保持精度,并通过每次倾斜的扩展数据采集来提高S/N比率.

结论:

  • 有效的采样点选择大大缩短了St-ALCHEMI的测量时间.
  • 该方法最大限度地减少了电子辐射对样品的损害.
  • 这种方法提高了分析材料中剂分布的实用性和效率.