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相关概念视频

Parallel Processing01:20

Parallel Processing

185
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Cluster Sampling Method01:20

Cluster Sampling Method

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Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a cluster sample, divide the population into clusters (groups) and then randomly select some of the clusters. All the members from these clusters are in the cluster sample. For example, if you randomly sample four departments from your...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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关于现代异质超级计算机的结合集群理论.

Hector H Corzo1, Andreas Erbs Hillers-Bendtsen2, Ashleigh Barnes1

  • 1Oak Ridge National Laboratory, Oak Ridge, TN, United States.

Frontiers in chemistry
|June 30, 2023
PubMed
概括

本研究介绍了对合集群 (CC) 理论的Divide-Expand-Consolidate (DEC) 方法,以解决大型化学系统中的计算挑战. 对CPS (D-3) 模型的新算法为计算分子性质提供了可扩展和快速的解决方案.

关键词:
集群扰动理论集群扰动理论结合集群理论结合集群理论脱氧核糖核酸是一种脱氧核酸.分割-扩展-整合 结合的集群框架激发激发能量的能量.这是一种四化大麻醇 (tetrahydrocannabinol).

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科学领域:

  • 计算化学是一种计算化学.
  • 量子化学是一种量子化学.
  • 理论化学是一种理论化学.

背景情况:

  • 在计算上阐明复杂的化学系统带来了重大挑战.
  • 传统的ab-initio方法与大分子系统的扩展斗争.

研究的目的:

  • 将Divide-Expand-Consolidate (DEC) 方法作为线性缩放,对结合集群 (CC) 理论进行大规模并行框架.
  • 引入集群扰动理论和CPS (D-3) 模型,以解决计算可扩展性的局限性.
  • 详细介绍CPS (D-3) 方法的新算法,这些算法利用并行处理来有效计算分子性质.

主要方法:

  • 实施分割-扩展-整合 (DEC) 框架用于合集群 (CC) 理论.
  • 集群扰动理论的应用,以解决DEC方法的局限性.
  • 开发用于CPS (D-3) 模型的新算法,使用多个节点和图形处理单元来进行张量收缩.

主要成果:

  • DEC框架证明了对大型化学系统的适用性,但具有固有的局限性.
  • 由CC单次和双次激发产生的CPS (D-3) 模型有效计算激发能.
  • 新的算法通过高效利用并行处理资源来加速计算.

结论:

  • CPS (D-3) 模型提供了一个可扩展,快速和精确的方法来计算大型系统中的分子性质.
  • 这种方法为复杂的化学研究提供了传统合集群模型的有效替代方案.