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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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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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Drug Concentration Versus Time Correlation01:15

Drug Concentration Versus Time Correlation

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The plasma drug concentration-time curve is a crucial tool in pharmacokinetics, representing the drug's concentration in plasma at different time intervals post-administration. This curve illustrates the drug's journey from absorption into the systemic circulation, distribution to body tissues, and eventual elimination through excretion or biotransformation.
Two pivotal parameters are the minimum effective concentration (MEC) and the minimum toxic concentration (MTC). The MEC is the...
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Correlation01:09

Correlation

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In statistics, two variables are said to be correlated if the values of one variable are associated with the other variable. Depending on the relationship between two variables, correlation can be of three types– positive correlation, negative correlation, and zero correlation.
Two variables, for example, a and b, are said to be positively correlated if both variables move in the same direction. In other words, a positive correlation exists between two variables, a and b, if:
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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...
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Methods of Obtaining Topography01:25

Methods of Obtaining Topography

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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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Updated: Jan 7, 2026

Functional Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling
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Salto de Superficie con Métodos Totalmente Correlacionados

Ely G F de Miranda1, Rafael Souza Mattos2, Saikat Mukherjee3

  • 1Instituto de Física, Universidade de São Paulo, Rua do Matão, São Paulo 1731, Brazil.

Journal of chemical theory and computation
|December 31, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los métodos de estructura electrónica totalmente correlacionados mejoran las simulaciones de reacciones químicas. Sin embargo, los costos computacionales limitan su uso, lo que sugiere que se necesitan avances en los algoritmos de espacio activo para simulaciones no adiabáticas precisas.

Palabras clave:
salto de superficiedinámica no adiabáticamétodos de estructura electrónicaquímica cuánticaquímica computacional

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Área de la Ciencia:

  • Química Computacional; Química Cuántica; Química Teórica

Sus antecedentes:

  • Las simulaciones de salto de superficie requieren métodos precisos de estructura electrónica.
  • Los métodos totalmente correlacionados (CASPT2, MRCI, L-PDFT, MRSF-TDDFT) muestran promesa pero enfrentan desafíos computacionales.
  • Los métodos parcialmente correlacionados (ADC(2), TDDFT) son computacionalmente menos exigentes.

Objetivo del estudio:

  • Evaluar el estado actual de los métodos de estructura electrónica totalmente correlacionados en simulaciones de salto de superficie.
  • Analizar simulaciones representativas de la dinámica de fulveno y pirrol.
  • Identificar limitaciones y sugerir direcciones futuras para simulaciones no adiabáticas precisas.

Principales métodos:

  • Simulaciones de salto de superficie.
  • Análisis de los métodos CASPT2, MRCI, L-PDFT, MRSF-TDDFT, ADC(2) y TDDFT.
  • Estudios de caso utilizando fulveno y pirrol.

Principales resultados:

  • Los métodos totalmente correlacionados mejoran las descripciones de las reorganizaciones de enlaces y la dinámica del estado fundamental caliente.
  • Los métodos parcialmente correlacionados son suficientes para la relajación del estado excitado fotoquímico.
  • Las inestabilidades del espacio activo y las discontinuidades de la energía potencial siguen siendo limitaciones persistentes.

Conclusiones:

  • Los avances en los algoritmos de espacio activo generalizados y grandes son cruciales.
  • Los métodos mejorados aumentarán la confiabilidad y accesibilidad de las simulaciones no adiabáticas de alta precisión.
  • Equilibrar la precisión y el costo computacional es clave para aplicaciones prácticas.