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相关概念视频

Three-Winding Transformers01:19

Three-Winding Transformers

256
Three identical single-phase transformers can be configured to form a three-phase transformer connection, which involves high-voltage and low-voltage windings. The high-voltage windings are denoted by capital letters A-B-C, while the low-voltage windings are labeled with lowercase letters a-b-c, representing their respective phases. This notation helps distinguish between the high and low voltage sides of the transformer.
In the per-unit equivalent circuit of a grounded Y-Y three-phase...
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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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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Trihybrid Crosses02:27

Trihybrid Crosses

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Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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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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具有双环结构的三基生成.

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    此摘要是机器生成的。

    一个新的双环三激光源简化了多光谱学. 这项创新提供了独立控制的脉冲和可调节的重复频率,为具有成本效益的,可在现场部署的计量应用铺平了道路.

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    科学领域:

    • 光学光谱学是指光学光谱学.
    • 激光物理学的激光物理学
    • 计量学 计量学 计量学

    背景情况:

    • 三光谱通过解决模糊性和消除延迟阶段来增强双光谱.
    • 目前的三生成方法复杂且昂贵.
    • 现有的单腔三结构缺乏独立的脉冲控制.

    研究的目的:

    • 开发一种简化且具有成本效益的三激光源.
    • 在三系统中实现可独立控制的输出脉冲.
    • 为了实现现场部署的多计量技术.

    主要方法:

    • 引入了一种双环三种子源结构.
    • 在一个环内利用基于波长的多重复合.
    • 使用环内偏振控制器 (PC) 进行调整.

    主要成果:

    • 实现可独立控制的波长和输出脉冲的功率.
    • 通过调整PC来证明可调节的重复频率 (Δf).
    • 在单波长模式锁定下观察到~20nm波长调范围.

    结论:

    • 双环三源为多计量提供了一个低复杂性的解决方案.
    • 这种设计克服了以前三结构的局限性.
    • 能够在光谱学和计量学中实现实用,现场部署的应用.