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Videos de Conceptos Relacionados

Carrier Transport01:21

Carrier Transport

The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Navier–Stokes Equations01:28

Navier–Stokes Equations

For incompressible Newtonian fluids, where density remains constant, stresses show a linear relationship with the deformation rate, defined by normal and shear stresses. Normal stresses depend on the pressure exerted on the fluid and the rate of deformation in specific directions, which determines how fluid flows under varying pressures. Shear stresses, on the other hand, act tangentially across fluid layers. They explain how adjacent fluid layers slide relative to one another, connecting...
Surface Integrals of Vector Fields: Flux01:22

Surface Integrals of Vector Fields: Flux

Understanding the movement of air masses is fundamental to meteorological analysis and atmospheric modeling. A key component in this process is quantifying the total mass of air that flows into or out of a defined region over a specified period of time. This is achieved by evaluating the mass flux across a boundary surface, a conceptual tool that simplifies the complex dynamics of atmospheric systems.To begin, an imaginary boundary surface S is introduced, enclosing the region of interest. The...
Euler's Equations of Motion01:28

Euler's Equations of Motion

In fluid mechanics, shear stresses arise from viscosity, which represents a fluid's internal resistance to deformation. For low-viscosity fluids, like water, these stresses are minimal, simplifying flow analysis by allowing the fluid to be treated as inviscid, or frictionless. In an inviscid fluid, shear stresses are absent, leaving only normal stresses, which act perpendicularly to fluid elements. Notably, pressure — defined as the negative of the normal stress — remains uniform across...
Vector Forms of Green’s Theorem01:26

Vector Forms of Green’s Theorem

The study of fluid motion often involves understanding how local rotational behavior relates to global circulation. In the context of a pond with pollutants, direct measurement of water movement along an irregular shoreline can be impractical. Green’s Theorem in vector form provides an alternative by relating the circulation around a closed boundary to properties of the flow within the enclosed region.Measurements of water velocity at different points define a continuous vector field that...
Xylem and Transpiration-driven Transport of Resources02:03

Xylem and Transpiration-driven Transport of Resources

The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.

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Video Experimental Relacionado

Updated: Jul 12, 2026

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
10:28

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

Published on: June 13, 2020

Las corrientes oceánicas impulsadas por el viento y el transporte ekman.

J F Price, R A Weller, R R Schudlich

    Science (New York, N.Y.)
    |December 11, 1987
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Los investigadores verificaron la teoría de transporte de Ekman, encontrando que la tensión del viento y la fuerza de Coriolis mueven el agua a la derecha del viento. Las mediciones in situ confirmaron las predicciones teóricas con una precisión del 10%, con la mayor parte del transporte cerca de la superficie.

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    Área de la Ciencia:

    • Oceanografía La oceanografía es la oceanografía.
    • Dinámica de fluidos La dinámica de fluidos.
    • Ciencias ambientales Ciencias ambientales.

    Sus antecedentes:

    • La teoría de transporte de Ekman describe el movimiento del agua debido al estrés del viento y la fuerza de Coriolis.
    • La verificación de esta teoría es crucial para comprender los patrones de circulación oceánica.

    Objetivo del estudio:

    • Para validar empíricamente la relación de transporte teórica de Ekman.
    • Para cuantificar la precisión de las predicciones de transporte de Ekman utilizando datos del mundo real.

    Principales métodos:

    • Realizar mediciones in situ de las corrientes eólicas y oceánicas.
    • Aislar las corrientes impulsadas por el viento de las corrientes totales medidas.
    • El promedio de los datos durante períodos prolongados para garantizar la confiabilidad.

    Principales resultados:

    • El transporte oceánico observado coincidía estrechamente con las predicciones teóricas de transporte de Ekman, con una desviación de aproximadamente el 10%.
    • La mayoría del transporte impulsado por el viento (95%) se concentró en los 25 metros superiores de la columna de agua.
    • Las buenas condiciones climáticas de verano influyeron en la naturaleza de la superficie atrapada del transporte.

    Conclusiones:

    • El estudio proporciona un fuerte apoyo empírico a la teoría del transporte de Ekman.
    • Los hallazgos destacan el impacto significativo de las condiciones de la superficie en la dinámica de las corrientes oceánicas.
    • Los resultados mejoran nuestra comprensión del movimiento del agua impulsado por el viento en entornos marinos.