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Schemas01:42

Schemas

10.8K
A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Gauss's Law: Planar Symmetry01:27

Gauss's Law: Planar Symmetry

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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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Aliasing01:18

Aliasing

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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
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Perceptual Constancy01:12

Perceptual Constancy

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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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Causes of Similarity-Dissimilarity Effect01:26

Causes of Similarity-Dissimilarity Effect

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The similarity-dissimilarity effect, a fundamental concept in social psychology, explains how interpersonal similarities and differences influence attraction and social interactions. This effect is supported by three key psychological perspectives: balance theory, social comparison theory, and consensual validation.Balance Theory and Cognitive ConsistencyBalance theory, developed by Fritz Heider, posits that individuals seek cognitive consistency in their relationships. When two people share...
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Video Experimental Relacionado

Updated: May 4, 2026

Setting Limits on Supersymmetry Using Simplified Models
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Setting Limits on Supersymmetry Using Simplified Models

Published on: November 16, 2013

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Las galaxias parecen más simples de lo esperado.

M J Disney1, J D Romano, D A Garcia-Appadoo

  • 1School of Physics & Astronomy, Cardiff University, 5 The Parade, Cardiff CF24 3AA, UK. mjd@astro.cf.ac.uk

Nature
|October 25, 2008
PubMed
Resumen
Este resumen es generado por máquina.

La evolución galáctica parece sorprendentemente organizada. Un estudio de galaxias detectadas a través de hidrógeno neutro revela correlaciones inesperadas, desafiando el modelo estándar de materia oscura fría y fría de formación de galaxias.

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Área de la Ciencia:

  • Evolución cósmica y formación de galaxias.
  • Astrofísica y cosmología observacional.
  • El papel del hidrógeno neutro en los estudios de galaxias.

Sus antecedentes:

  • Las galaxias son sistemas complejos formados por dinámicas, formación de estrellas, enriquecimiento químico y retroalimentación de supernovas y agujeros negros.
  • La teoría jerárquica de la formación de galaxias postula que las galaxias se reúnen a través de fusiones de materia oscura fría.
  • Las propiedades de las galaxias están influenciadas teóricamente por la masa, el momento angular, la fracción bariónica, la edad, el tamaño y la historia de las fusiones.

Objetivo del estudio:

  • Para investigar los principios organizativos que rigen las propiedades de las galaxias.
  • Para probar las predicciones de la formación de galaxias jerárquicas con datos de observación.
  • Para identificar posibles parámetros subyacentes que controlan la estructura de las galaxias.

Principales métodos:

  • Estudió una muestra de galaxias detectadas a través de la emisión de radiofrecuencia de hidrógeno neutro, evitando sesgos de selección óptica.
  • Analizó las correlaciones entre seis observables independientes a través de una amplia gama de propiedades de galaxias.
  • Examinó las implicaciones de las correlaciones observadas para las teorías de formación de galaxias.

Principales resultados:

  • Se observaron cinco correlaciones independientes entre seis observables independientes en la muestra de galaxias estudiada.
  • A pesar de una amplia gama de propiedades, las galaxias exhibieron un alto grado de organización.
  • Los datos sugieren que un solo parámetro no identificado puede controlar la estructura de las galaxias.

Conclusiones:

  • La organización observada en las propiedades de las galaxias desafía el modelo estándar de formación de galaxias jerárquicas.
  • Los hallazgos indican una posible discrepancia entre el modelo de materia oscura fría y la estructura de la galaxia.
  • Se necesita más investigación para identificar el parámetro que rige esta organización galáctica inesperada.