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相关概念视频

Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

830
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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Mass Spectrum01:23

Mass Spectrum

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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x axis represents the ratio of the mass of the charged fragment to the elementary charge it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal...
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Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
741
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

658
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
658
Noncompartmental Analysis: Statistical Moment Theory00:56

Noncompartmental Analysis: Statistical Moment Theory

139
Noncompartmental analyses leverage statistical moment theory to examine time-related changes in macroscopic events, encapsulating the collective outcomes stemming from the constituent elements in play. Statistical moment theory is a mathematical approach used to describe the time course of drug concentration in the body without assuming a specific compartmental model. SMT provides insights into drug absorption, distribution, metabolism, and elimination by treating drug concentration versus time...
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Mass Spectrometers01:16

Mass Spectrometers

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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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Updated: Jul 25, 2025

Multifractal Spectrum Analysis for Assessing Pulmonary Nodule Malignancy
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质量函数的多分位分析.

Chenhui Qiang1,2, Zhen Li3, Yong Deng4

  • 1Institute of Fundamental and Frontier Science, University of Electronic Science and Technology of China, Chengdu, 610054 China.

Soft computing
|June 26, 2023
PubMed
概括
此摘要是机器生成的。

本研究引入了普斯特-沙弗理论中质量函数的泛化多分体维度,增强了尺度不变性,并提高了基于证据的系统中的分类准确性.

关键词:
坎托尔集 坎托尔集 坎托尔集登格 Entropy 是指的.维度 维度 是一个维度.质量函数质量函数质量函数多分法是多分法的一种.在Renyi中,是的.

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科学领域:

  • 信息理论 信息理论
  • 人工智能的人工智能
  • 数学分析的数学分析

背景情况:

  • 斯特-沙弗证据理论使用质量函数处理不确定性.
  • 对于质量函数的现有碎形维度与Renyi信息维度不兼容.
  • 信念的尺度不变性是探索的一个关键特征.

研究的目的:

  • 通过引入一个参数来概括质量函数的碎形维度.
  • 为质量函数提出一个包含尺度不变的多分形维度.
  • 开发一种方法,使用修改的质量函数来提高分类准确性.

主要方法:

  • 引入一个参数来概括现有的碎形维度,创建一个多碎形维度.
  • 通过使用多分形光谱,探索信仰程度和焦点元素之间的关系.
  • 开发用于质量函数修改的静态贴现系数方法.

主要成果:

  • 拟议的多分体维度概括了现有的维度,并显示与Renyi维度的兼容性.
  • 多分法谱揭示了信仰程度和焦点元素之间的关系.
  • 静态贴现系数方法有效地提高了对三个数据集的分类准确性.

结论:

  • 质量函数的多分形维度是分析德姆斯特-沙弗理论中分形特征的宝贵工具.
  • 拟议的方法提供了一种新的方法来提高证据分类的准确性.
  • 进一步的研究可以探索多分法分析在复杂系统中的应用.