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相关概念视频

Sieve Analysis and Grading Curves01:19

Sieve Analysis and Grading Curves

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Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
308
Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

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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...
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Gravimetry: Overview01:05

Gravimetry: Overview

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Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
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Sampling Plans01:23

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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...
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Precipitation Gravimetry01:03

Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Sampling Methods: Overview01:06

Sampling Methods: Overview

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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...
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相关实验视频

Updated: Jun 6, 2025

Author Spotlight: Efficient Image Recognition Using Directional Gradient Histogram Technique and Support Vector Machines
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基于局部采样的沙分级检测方法.

Yang Zhang1, Danxia Hou2, Chuanyun Xu2

  • 1College of Computer and Information Science, Chongqing Normal University, Chongqing, 401331, China. zhangyang@cqnu.edu.cn.

Scientific reports
|November 28, 2024
PubMed
概括
此摘要是机器生成的。

本研究引入了用于自动化砂分级检查的局部抽样方法. 这种方法提高了确定建筑砂质量的效率和准确性,以获得更好的混凝土性能.

关键词:
地方采样 地方采样机械化沙子 机械化沙子沙子分级检测检测 沙子分级检测

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科学领域:

  • 土木工程 土木工程是指土木工程.
  • 材料科学 材料科学 材料科学
  • 建筑技术 建筑技术 建筑技术

背景情况:

  • 砂分级对于混凝土混合设计至关重要,影响强度和可加工性.
  • 传统的选方法用于砂分级分析是低效的.
  • 由于成像的局限性,自动机器视觉方法面临着细砂颗粒 (低于0.15毫米) 的挑战.

研究的目的:

  • 开发一种自动化沙子分级检测方法,用于0.075至4.75毫米之间的颗粒.
  • 为了克服在自动检查系统中捕获细砂颗粒的局限性.
  • 为了提高建筑砂质量控制的效率和降低成本.

主要方法:

  • 开发了一种新的局部采样技术.
  • 创建了一个具有灵活振动盘的硬件系统,用于统一的沙子分散和随机局部采样.
  • 一个软件系统被设计用于基于汇总的本地采样数据的分级检测.

主要成果:

  • 局部抽样方法表明,与整体样本相似的颗粒大小分布.
  • 多次局部采样显著降低了分级检测错误.
  • 拟议的方法有效地捕捉了建筑砂的粒径分级.

结论:

  • 局部采样为自动检测沙粒大小分级 (0.0754.75毫米) 提供了有效的解决方案.
  • 这种方法显著增加了建筑砂分级检测的频率.
  • 改善建筑砂的质量控制可以提高整体建筑质量.