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Titration Calculations: Strong Acid - Strong Base02:28

Titration Calculations: Strong Acid - Strong Base

34.2K
Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
34.2K
Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

36.2K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
36.2K
Titration of a Strong Acid with a Strong Base01:23

Titration of a Strong Acid with a Strong Base

10.6K
During the titration of a strong acid with a strong base, pH calculations are primarily based on the concentration of residual hydronium or hydroxide ions. Initially, a strong acid like hydrochloric acid fully dissociates, creating hydronium and chloride ions, resulting in a low pH. The addition of a strong base like sodium hydroxide alters the concentration of hydronium ions by neutralizing them. As more base is added, the pH gradually increases. At the equivalence point, all hydronium ions...
10.6K
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

49.4K
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
49.4K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.7K
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...
1.7K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K

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ディープラーニングが支援した,多次元のアナポルとエクシトンの間の二重強いカップリング.

Ziqiao Liu, Yang Liao, Yuan Liu

    Optics letters
    |February 13, 2026
    PubMed
    まとめ

    この研究は,新しいスタックされたナノディスクシステムで,第1次および第2次アナポールの同時刺激を実証しています. これにより,複数のエキソンと二重強い結合が可能になり,光物質相互作用のための新しい道が開きます.

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    科学分野:

    • ナノフォトニクス ナノフォトニクス
    • 量子光学とは,量子光学である.
    • マテリアルサイエンス 材料科学

    背景:

    • 高級アナポールは,濃縮されたエネルギーと狭い共鳴を提供し,非線形光学と強力な結合に最適です.
    • マルチオーダーのアナポルを含む同時進行の強い結合は,まだ十分に研究されていない.

    研究 の 目的:

    • 理論的には,複数のエキソンを持つ多次元のアナポールの同時刺激と結合を可能にするハイブリッドシステムを構築する.
    • 双重強い結合の行動を調査し,エネルギー分裂を定量化するために.

    主な方法:

    • Si,MoSe2,MoTe2ナノディスクからなる3層の積み重ねハイブリッドシステムが理論的に設計されました.
    • システム分析のためのニューラルネットワークを構築するために,ディープラーニング (DL) が採用されました.
    • 第1次および第2次アナポールの同時刺激と,物質エキソンとの結合を分析した.

    主要な成果:

    • このシステムは,第1次および第2次アナポリを同時に成功裏に刺激しました.
    • 双重強い結合が達成されました: MoTe2エキストンによる第一次アナポールとMoSe2エキストンによる第二次アナポールです.
    • 大量のラビ分裂 (100.6 meVと118.2 meV) を有する4つのエネルギーブランチが観察されました.

    結論:

    • 提案されたハイブリッドシステムは,多次元のアナポルと複数のエキソンを含む軽量物質の相互作用を効果的に促進します.
    • この研究は,高度な量子光学現象の探索のための新しいプラットフォームを提供します.