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相关概念视频

Sampling Methods: Overview01:06

Sampling Methods: Overview

382
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...
382
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...
12.0K
Sampling Plans01:23

Sampling Plans

214
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...
214
Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

281
Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
281
Random Sampling Method01:09

Random Sampling Method

11.2K
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...
11.2K
Stratified Sampling Method01:16

Stratified Sampling Method

12.1K
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. 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.
To choose a stratified sample, divide the population into groups called strata and then take a...
12.1K

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相关实验视频

Updated: Jul 23, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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在OpenMM包中的扩展相位空间中实现基于集体变量的增强采样方法的互操作性实施.

Shitanshu Bajpai1, Brian K Petkov2, Muchen Tong2

  • 1Department of Chemistry, Indian Institute of Technology Kanpur (IITK), Kanpur, India.

Journal of computational chemistry
|July 19, 2023
PubMed
概括

这项研究引入了一个新的计算平台,用于在分子模拟中增强采样,加速跨越障碍事件. 该平台使用扩展变量和先进的采样技术,能够有效地探索复杂的构造景观.

关键词:
温度加速的分子动力学温度加速切片采样采样 温度加速切片采样采样统一的自由能源动力学.驱动的 - - 阿迪亚巴特自由能动力学.雨抽样是统一的抽样.

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相关实验视频

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科学领域:

  • 计算化学是一种计算化学.
  • 分子动力学模拟的模拟.
  • 生物物理学的生物物理.

背景情况:

  • 改进的采样技术加速了跨越障碍事件的分子模拟.
  • 扩展变量形式,包括TAMD,d-AFED,UFED和TASS,使得快速的结构空间探索成为可能.
  • 这些方法有效地同时采样多个集体变量,通过在更高的温度下保持扩展变量.

研究的目的:

  • 为扩展相位空间增强采样模拟提供一个计算平台.
  • 在OpenMM引擎中实现各种采样技术的互操作性.
  • 为参数确定和高维自由能量表面重建提供协议.

主要方法:

  • 使用OpenMM分子动力学引擎开发一个计算平台.
  • 扩展相位空间增强采样技术的实施.
  • 利用先进的恒温器和多个时间步骤算法.
  • 开发用于参数确定和自由能量表面重建的协议.

主要成果:

  • 介绍了一个用于增强采样模拟的多功能计算平台.
  • 该平台展示了多种采样技术的互操作性.
  • 建立了关键参数确定和自由能量表面重建的协议.
  • 氨酸三,四-sarcosine,和Trp-cage蛋白的成功应用到高维的构造景观.

结论:

  • 开发的平台促进了分子模拟中的高效增强采样.
  • 它可以对高维的自由能源景观进行强大的重建.
  • 该方法在各种分子系统中得到了验证,展示了其广泛的适用性.