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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Video Experimental Relacionado

Updated: Jan 29, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
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Microscopía SQUID-en-Punta en Modo de Contacto con Uniones Josephson de Proximidad

Matthijs Rog1, Tycho J Blom1, Daan B Boltje2

  • 1Huygens-Kamerlingh Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands.

Nano letters
|January 27, 2026
PubMed
Resumen

Desarrollamos una nueva técnica SQUID-en-punta en modo de contacto para medir dinámicas a nanoescala en materiales cuánticos. Este método obtiene imágenes no invasivas de corrientes, magnetismo y disipación, avanzando en la fabricación de chips cuánticos.

Palabras clave:
FMAtefecto JosephsonSQUIDmicroscopíabarrido

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Área de la Ciencia:

  • Ciencia de Materiales Cuánticos
  • Nanotecnología
  • Física de la Materia Condensada

Sus antecedentes:

  • La comprensión de las dinámicas a nanoescala es crucial para el desarrollo de materiales cuánticos y chips cuánticos.
  • La medición de propiedades fuera de equilibrio, como la corriente y la disipación a nanoescala, sigue siendo un desafío.
  • Los dispositivos superconductores de interferencia cuántica (SQUID) ofrecen alta sensibilidad magnética y térmica para mediciones a nanoescala.

Objetivo del estudio:

  • Introducir una novedosa técnica SQUID-en-punta en modo de contacto para la medición de propiedades dinámicas a nanoescala.
  • Permitir la obtención de imágenes simultáneas de múltiples propiedades físicas en nanoestructuras complejas.
  • Proporcionar un método no invasivo para el estudio de materiales exóticos y circuitos cuánticos.

Principales métodos:

  • Integración de microscopía de fuerza atómica con detección nanoSQUID (SQUID-en-punta en modo de contacto).
  • Minimización de la distancia nanoSQUID-muestra para una mayor sensibilidad y detección de campo magnético en el plano.
  • Utilización de multiplexación por frecuencia para la adquisición simultánea de datos.
  • Empleo de nanoSQUIDs de unión de proximidad con lectura electrónica de cuatro puntas.

Principales resultados:

  • Obtención de imágenes simultáneas de corrientes a nanoescala, magnetismo, disipación y topografía.
  • Resolución de corrientes a nanoescala de hasta 100 nA.
  • Operación exitosa en nanoestructuras altamente corrugadas.
  • Captura no invasiva de respuestas magnéticas, térmicas y electrónicas locales.

Conclusiones:

  • El SQUID-en-punta en modo de contacto es una potente técnica no invasiva para el estudio de dinámicas a nanoescala.
  • El método facilita el avance de la investigación en materiales cuánticos y la fabricación de chips cuánticos.
  • Permite la investigación detallada de fenómenos dinámicos en sistemas cuánticos delicados.