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Videos de Conceptos Relacionados

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Space-Time Curvature and the General Theory of Relativity01:17

Space-Time Curvature and the General Theory of Relativity

In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of motion,...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:

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Video Experimental Relacionado

Updated: Jul 12, 2026

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
13:44

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

Published on: August 30, 2013

Los fractales y la estructura cosmológica a gran escala.

X Luo, D N Schramm

    Science (New York, N.Y.)
    |April 24, 1992
    PubMed
    Resumen

    El universo El universo El universo.

    Área de la Ciencia:

    • Cosmología Cosmología.
    • La astrofísica es la astrofísica.
    • Formación de estructuras a gran escala en la formación de estructuras.

    Sus antecedentes:

    • Las correlaciones entre galaxias y cúmulos revelan estructuras a gran escala en el universo.
    • Estas estructuras exhiben propiedades fractales en ciertas escalas.

    Objetivo del estudio:

    • Para analizar la dimensión fractal de una estructura a gran escala.
    • Para restringir los modelos de formación de estructuras cósmicas basados en propiedades fractales.

    Principales métodos:

    • Ajuste de las correlaciones observadas entre galaxias y cúmulos de galaxias y cúmulos de cúmulos con un modelo fractal limitado.
    • Analizando las implicaciones de la dimensión fractal para los procesos de crecimiento de la estructura.

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    Principales resultados:

    • La estructura a gran escala es un fractal "limitado" con la dimensión D ≈ 1.2.
    • El comportamiento fractal transiciones a la distribución aleatoria en grandes escalas.
    • La dimensión fractal observada sugiere el crecimiento de objetos de hoja en 2D.

    Conclusiones:

    • La dimensión fractal de las estructuras cósmicas proporciona restricciones a los mecanismos de formación.
    • El crecimiento de la estructura a gran escala probablemente se originó a partir de precursores 2D como panqueques o paredes de dominio.