Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

1.2K
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
1.2K
One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation01:24

One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation

1.1K
This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
On...
1.1K
Inductive Effects on Chemical Shift: Overview01:27

Inductive Effects on Chemical Shift: Overview

2.0K
The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
2.0K
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

1.3K
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
1.3K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

604
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
604
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

47.6K
sp3d and sp3d 2 Hybridization
47.6K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Extreme events of quantum walks on networks.

Physical review. E·2026
Same author

Flux-fluctuation relation for quantum walks on networks.

Physical review. E·2026
Same author

Congestion and extreme events in urban street networks.

Chaos (Woodbury, N.Y.)·2026
Same author

Dependence of Krylov complexity saturation on the initial operator and state.

Physical review. E·2025
Same author

Universal Statistics of Competition in Democratic Elections.

Physical review letters·2025
Same author

Continuous gated first-passage processes.

Reports on progress in physics. Physical Society (Great Britain)·2024
Same journal

Erratum: Low-dimensional model for adaptive networks of spiking neurons [Phys. Rev. E 111, 014422 (2025)].

Physical review. E·2026
Same journal

Disentangling the effects of many-body forces on depletion interactions.

Physical review. E·2026
Same journal

Charge transport and mode transition in dual-energy electron beam diodes.

Physical review. E·2026
Same journal

Optimization of multisite reactions in complex compartmentalized media.

Physical review. E·2026
Same journal

Origin of geometric cohesion in nonconvex granular materials: Interplay between interdigitation and rotational constraints enhancing frictional stability.

Physical review. E·2026
Same journal

Interaction of walkers with a standing Faraday wave.

Physical review. E·2026
查看所有相关文章

相关实验视频

Updated: Jan 11, 2026

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys
12:18

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys

Published on: June 27, 2022

3.3K

在克里洛夫基层探测局部化效应.

J Bharathi Kannan1, Sreeram Pg1, Sanku Paul2

  • 1Indian Institute of Science Education and Research, Department of Physics, Pune 411008, India.

Physical review. E
|November 18, 2025
PubMed
概括
此摘要是机器生成的。

克里洛夫复杂性 (K-复杂性) 和阿诺尔迪系数揭示了量子转子中的各种量子局部化现象. 这些测量可以区分局部化类型,甚至可以检测局部化量子动态中的混乱开始.

更多相关视频

Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA
08:17

Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA

Published on: July 9, 2021

5.1K
Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization
10:01

Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization

Published on: July 30, 2020

7.8K

相关实验视频

Last Updated: Jan 11, 2026

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys
12:18

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys

Published on: June 27, 2022

3.3K
Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA
08:17

Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA

Published on: July 9, 2021

5.1K
Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization
10:01

Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization

Published on: July 30, 2020

7.8K

科学领域:

  • 量子物理学的量子物理学
  • 这是量子混沌.
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 克里洛夫复杂性 (K-复杂性) 测量量子状态的复杂性和运算符的增长.
  • 量子混沌是量子力学研究的一个关键领域.
  • 量子转子 (QKR) 是探索量子混乱和局部化的模型系统.

研究的目的:

  • 在量子转子 (QKR) 中调查各种局部化现象.
  • 使用K复杂度和阿诺尔迪系数来分析量子状态复杂度和运算符增长.
  • 区分不同类型的局部化,并检测混乱的开始.

主要方法:

  • 在量子系统中应用K-复杂性分析.
  • 使用阿诺尔迪系数来研究操作员动态.
  • 在克里洛夫链上分析波函数演变.
  • 在QKR模型中调查四种不同的本地化场景.

主要成果:

  • 对于不同的本地化场景,K-复杂度和阿诺尔迪系数表现出不同的特征.
  • K-复杂性和波函数演变的长期行为可以区分局部化类型.
  • K-复杂性捕捉到本地化的程度和性质.
  • 时间平均K复杂度和阿诺尔迪系数缩放区分了古典和量子定位效应.
  • 阿诺尔迪系数揭示了即使在局部化量子力学中,混乱的出现.

结论:

  • K-复杂性和阿诺尔迪系数是描述量子局部化和混乱的强大工具.
  • 这些测量提供了对量子系统本地化驱动的基本机制的洞察.
  • 这项研究促进了对像QKR这样复杂系统中的量子动力学的理解.