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NMR Spectroscopy of Aromatic Compounds

NMR Spectroscopy of Aromatic Compounds

Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.

NMR Spectrometers: Overview

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...

Nuclear Magnetic Resonance (NMR): Overview

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...

Schemas

Schemas

A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.

Applications Of NMR In Biology

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.

NMR Spectroscopy Of Amines

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...

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对NoSQL数据库的属性基于访问控制.

Eeshan Gupta¹, Shamik Sural¹, Jaideep Vaidya²

¹Indian Institute of Technology, Kharagpur, India.

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|January 17, 2025

概括

此摘要是机器生成的。

基于属性的访问控制 (ABAC) 通过集成灵活,动态的访问策略来增强NoSQL数据库的安全性. 这种方法可以在传统上使用基于角色的访问控制 (RBAC) 的MongoDB等系统中改善数据保护.

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科学领域:

计算机科学计算机科学
数据库安全数据库安全
信息系统信息系统信息系统

背景情况:

NoSQL数据库越来越多地用于非结构化数据,要求强大的安全性.
像MongoDB这样的NoSQL数据库中现有的基于角色的访问控制 (RBAC) 在灵活性方面存在限制.
基于属性的访问控制 (ABAC) 提供了动态和细分的访问管理.

研究的目的:

在NoSQL数据库中提出和评估基于属性的访问控制 (ABAC) 的集成方法.
为了证明在MongoDB中实施ABAC的可行性.
评估ABAC在NoSQL环境中的性能影响.

主要方法:

开发了一个针对NoSQL数据库环境量身定制的ABAC模型.
在MongoDB中实现了ABAC模型.
进行了性能测试,以评估ABAC集成的效率.

主要成果:

成功地将ABAC集成到MongoDB中,将其访问控制功能扩展到RBAC之外.
证明了 ABAC 可以有效地在 NoSQL 数据库中实现.
性能结果表明,ABAC在高容量数据场景中管理访问的可行性.

结论:

ABAC为NoSQL数据库提供了灵活和动态的安全增强.
拟议的方法适用于MongoDB和潜在的其他NoSQL系统.
整合ABAC解决了在NoSQL环境中日益增长的对复杂数据安全性的需求.