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相关概念视频

Classical Conditioning01:18

Classical Conditioning

2.5K
Associative learning, a core principle in behavioral psychology, involves forming connections between events and facilitating learned responses. This concept is vividly illustrated by classical conditioning, a process extensively studied by the Russian physiologist Ivan Pavlov. Pavlov's pioneering research on dogs' digestive systems led to the discovery that behaviors can be learned through association, laying the groundwork for classical conditioning.
Ivan Pavlov observed that dogs...
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One-Compartment Open Model for Extravascular Administration: Zero-Order Absorption Model01:12

One-Compartment Open Model for Extravascular Administration: Zero-Order Absorption Model

386
Extravascular administration, such as oral or intramuscular routes, is a non-invasive drug delivery method, often preferred for ease and patient compliance. A key factor here is absorption, which dictates how quickly and effectively the drug enters the bloodstream from the administration site. Absorption follows either zero-order or first-order kinetics.
Zero-order absorption maintains a steady rate irrespective of the amount of drug left to be absorbed, making it a constant process. In the...
386
One-Compartment Open Model for Extravascular Administration: First-Order Absorption Model01:15

One-Compartment Open Model for Extravascular Administration: First-Order Absorption Model

568
The first-order absorption model for extravascular administration describes the rate at which a drug is absorbed and eliminated, following the principles of first-order kinetics. This model is vital as it provides a mathematical representation of drug behavior within the body. It also allows for the prediction and interpretation of drug absorption and elimination based on the rate of change in drug concentration over time. This model can be visualized as a plasma concentration-time profile...
568
Principles of Classical Conditioning01:23

Principles of Classical Conditioning

2.0K
Classical conditioning, as described by Ivan Pavlov, is a foundational concept in associative learning, where a neutral stimulus becomes capable of eliciting a conditioned response through association with an unconditioned stimulus. The process of acquisition, where this learning occurs, and the subsequent phenomena of contiguity, contingency, generalization, discrimination, extinction, and spontaneous recovery are crucial for a comprehensive understanding of classical conditioning.
During the...
2.0K
Drug Absorption: Factors Affecting GI Absorption01:19

Drug Absorption: Factors Affecting GI Absorption

6.4K
The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
6.4K
Classical Conditioning in Daily Life01:17

Classical Conditioning in Daily Life

2.3K
Classical conditioning, a fundamental principle of associative learning, explains various phenomena observed in daily life, such as fear development, the placebo effect, taste aversion, and drug habituation. These applications demonstrate the profound impact of associative learning on human behavior and physiological responses.
John B. Watson and Rosalie Rayner famously demonstrated the development of fear through classical conditioning in their experiment with Little Albert. They paired the...
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相关实验视频

Updated: Feb 12, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

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原子化QM/Classical模型的表面增强红外吸收的红外吸收.

Sveva Sodomaco1, Piero Lafiosca1, Tommaso Giovannini2,3

  • 1Scuola Normale Superiore, Classe di Scienze, Piazza dei Cavalieri 7, 56126 Pisa, Italy.

The journal of physical chemistry. C, Nanomaterials and interfaces
|February 11, 2026
PubMed
概括
此摘要是机器生成的。

我们开发了一种多尺度量子力学/分子力学 (QM/MM) 方法,准确地建模表面增强红外吸收 (SEIRA) 光谱. 这种方法有效地模拟了等离子体纳米结构上的分子,如金和石墨烯,与高精度计算方法相匹配.

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科学领域:

  • 计算化学的计算化学
  • 频谱学是一种光谱学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 表面增强红外吸收 (SEIRA) 光谱对于研究表面的分子振动至关重要.
  • 对等离子体分子相互作用的准确建模在计算上要求很高.
  • 现有的方法很难有效地捕捉分子和等离子纳米结构之间的复杂相互作用.

研究的目的:

  • 引入一种新的多尺度量子力学/分子力学 (QM/MM) 方法来模拟SEIRA光谱.
  • 为了使在等离子纳米结构上吸附的分子能够准确和计算效率高的建模.
  • 为理解等离子体-分子混合系统提供一个强大的框架.

主要方法:

  • 分子子系统是使用密度函数理论 (DFT) 来处理的.
  • 塑材料是使用频率依赖的波动电荷 (ωFQ) 和波动电荷和双极 (ωFQFμ) 模型进行建模的.
  • 该方法应用于在金纳米颗粒和石墨烯上吸附的腺因.

主要成果:

  • QM/MM方法准确地描述了石墨烯和贵金属纳米结构的等离子反应.
  • 模拟的SEIRA光谱与表面增强拉曼散射 (SERS) 数据和实验结果有很好的一致性.
  • 该方法的准确性与初始计算相美,计算效率得到了提高.

结论:

  • 拟议的多尺度QM/MM框架为模拟SEIRA光谱提供了可靠和高效的方法.
  • 这种方法增强了对等离子体-分子混合系统振动光谱学的理解.
  • 该方法适用于各种等离子体材料和吸附分子.