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相关概念视频

2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

1.1K
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
1.1K
Norton's Theorem01:14

Norton's Theorem

592
Norton's theorem is a fundamental principle stating that a linear two-terminal circuit can be substituted with an equivalent circuit, which comprises a current source (ⅠN) in parallel with a resistor (RN). Here, ⅠN represents the short-circuit current flowing through the terminals, and RN stands for the input or equivalent resistance at the terminals when all independent sources are deactivated. This implies that the circuit illustrated in Figure (a) can be exchanged with the...
592
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

715
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
715
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

2.4K
Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
2.4K
Sign Convention01:30

Sign Convention

2.0K
When analyzing a beam subjected to various loads, it is crucial to understand the internal forces and moments generated within the structure. These internal forces can be broadly classified into normal forces, shear forces, and bending moments. To determine these forces and moments, we use the method of sections and apply a specific sign convention based on their direction and the side of the section being analyzed.
The normal force acts perpendicular to the beam's cross-section and can...
2.0K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

198
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...
198

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相关实验视频

Updated: Jul 2, 2025

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
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一个2D加密哈希函数,包含同型加密,用于安全的数字签名.

Akshay Wali1, Harikrishnan Ravichandran2, Saptarshi Das1,2,3,4

  • 1Electrical Engineering and Computer Science, Penn State University, University Park, PA, 16802, USA.

Advanced materials (Deerfield Beach, Fla.)
|February 19, 2024
PubMed
概括

本研究介绍了一种新的用户验证平台,使用2D单层二硫化物 (MoS2) 记忆晶体管用于安全的加密密钥生成和数字签名. 这种方法增强了硬件信息安全原始体.

关键词:
两维材料是二维材料.数字签名数字签名数字签名硬件安全 硬件安全 硬件安全哈希函数 哈希函数 哈希函数 哈希函数同型型的加密方式.用户身份验证用户身份验证

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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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相关实验视频

Last Updated: Jul 2, 2025

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10:16

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12.3K
Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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科学领域:

  • 材料科学 材料科学 材料科学
  • 计算机科学 计算机科学
  • 电气工程 电气工程

背景情况:

  • 用户身份验证对于安全的信息交换至关重要,传统上依赖于不对称加密和数字签名.
  • 目前的方法涉及公钥和私钥对用于身份验证.
  • 敏感信息需要强大的安全协议来保持完整性和机密性.

研究的目的:

  • 介绍一个使用集成电路 (IC) 的用户验证平台,使用2D单层二硫化物 (MoS2) memtransistors.
  • 证明安全的加密密钥生成和创建独特的数字签名.
  • 为了突出基于NOR的哈希比传统的基于XOR的加密对硬件安全的优势.

主要方法:

  • 通过利用2D/氧化物接口上的载体捕获/解脱随机性来生成安全的加密密钥.
  • 使用NOR逻辑操纵开发一个安全的单向哈希函数.
  • 通过使用各种逻辑电路 (NAND,XOR,OR,NOT,AND) 的同态运算创建数字签名.

主要成果:

  • 从MoS2晶体管的随机行为中成功生成安全的加密密钥.
  • 使用基于NOR的哈希和随后的逻辑操作生成了独特的数字签名.
  • 解密签名验证了接收者的真实性,确保数据完整性和机密性,而不会泄露潜在信息.

结论:

  • 基于2D的IC,特别是MoS2的memtransistors,为开发关键硬件信息安全原体提供了潜力.
  • 基于NOR的散列比传统的基于XOR的加密对生成数字签名具有优势.
  • 提出的平台展示了安全的用户身份验证和数据保护的有希望的新方向.