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Videos de Conceptos Relacionados

Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Random Sampling Method01:09

Random Sampling Method

Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures 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. Among the various sampling methods used by...
Random Variables01:09

Random Variables

A random variable is a single numerical value that indicates the outcome of a procedure. The concept of random variables is fundamental to the probability theory and was introduced by a Russian mathematician, Pafnuty Chebyshev, in the mid-nineteenth century.
Uppercase letters such as X or Y denote a random variable. Lowercase letters like x or y denote the value of a random variable. If X is a random variable, then X is written in words, and x is given as a number.
For example, let X = the...
Randomized Experiments01:13

Randomized Experiments

The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
Basic Discrete Time Signals01:16

Basic Discrete Time Signals

The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is the...
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...

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Video Experimental Relacionado

Updated: Jun 25, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
11:00

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Published on: July 19, 2016

Creación de orden a partir de fluctuaciones aleatorias en pequeños conjuntos de espín.

R Budakian1, H J Mamin, B W Chui

  • 1IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA. budakian@us.ibm.com

Science (New York, N.Y.)
|January 22, 2005
PubMed
Resumen

Los investigadores aprovecharon las fluctuaciones estadísticas de espín para crear un orden de espín utilizando un microscopio de fuerza de resonancia magnética. Este orden de giro puede almacenarse durante 30 segundos y luego leerse.

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Last Updated: Jun 25, 2026

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Área de la Ciencia:

  • Física Física es la física de las cosas.
  • La mecánica cuántica es la mecánica cuántica.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Las fluctuaciones estadísticas en los espines de los electrones son inherentes a los conjuntos pequeños.
  • Controlar y utilizar estas fluctuaciones para estados de giro ordenados es un desafío.

Objetivo del estudio:

  • Demostrar métodos para crear y controlar el orden de giro a partir de las fluctuaciones naturales del giro.
  • Para investigar las capacidades de almacenamiento y lectura del orden de giro creado.

Principales métodos:

  • Utilizó un microscopio de fuerza de resonancia magnética (MRFM) para interactuar con los espines de los electrones.
  • Se emplearon dos técnicas distintas: captura selectiva del orden de giro transitorio y rectificación de retroalimentación en tiempo real de las fluctuaciones de giro.

Principales resultados:

  • Se creó con éxito un orden de espín mediante el aprovechamiento de las fluctuaciones estadísticas en conjuntos de espín de electrones.
  • Demostró dos nuevos métodos para la hiperpolarización de espín y la rectificación de fluctuaciones.
  • Se logró almacenar el orden de giro creado durante aproximadamente 30 segundos (tiempo de relajación longitudinal).

Conclusiones:

  • El orden de giro se puede generar activamente y controlar a partir de las fluctuaciones de giro estadísticas inherentes.
  • Los métodos desarrollados ofrecen nuevas vías para manipular los estados de espín a nanoescala.
  • La capacidad de almacenar y leer el orden de espín tiene implicaciones para el procesamiento y la detección de información cuántica.