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Videos de Conceptos Relacionados

Directional Relays01:25

Directional Relays

620
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Overcurrent Relays01:26

Overcurrent Relays

551
Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
551
Differential Relays01:20

Differential Relays

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Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
782
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

463
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
463
Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
496

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Video Experimental Relacionado

Updated: Feb 12, 2026

Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development
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Acoplamiento conjuntivo doble catalizado por níquel a través del relevo radical alternante de filicidad.

Ji Hwan Jeon1, Da Hye Kim1, Gun Ha Kim1

  • 1Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|February 11, 2026
PubMed
Resumen

Este estudio introduce un nuevo acoplamiento electrofilo cruzado catalizado por níquel para la formación de múltiples enlaces carbono-carbono. El método utiliza alquenos y 1,3-eninos, lo que permite una síntesis eficiente a través de un mecanismo de relevo radical.

Palabras clave:
1,3 - enynes también.El acoplamiento CC.Las reacciones multicomponentes son reacciones multicomponentes.La filicidad radical.doble acoplamiento conjuntivo de doble acoplamiento

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • La catálisis por catálisis.
  • Metodología sintética de la metodología sintética.

Sus antecedentes:

  • La formación de enlaces de carbono-carbono múltiples y remotos es un desafío sintético debido al control de la reactividad y la selectividad.
  • Los métodos existentes a menudo luchan con complejas formaciones de enlaces que requieren un control preciso.

Objetivo del estudio:

  • Desarrollar una nueva reacción de acoplamiento de acoplamiento electrofilo cruzado doble conjuntivo catalizado por níquel.
  • Para permitir la formación de múltiples enlaces C-C utilizando alquenos y 1,3-eninos como plataformas.

Principales métodos:

  • Acoplamiento electrofilo cruzado conjuntivo doble catalizado por níquel.
  • Utilizando alquenos y 1,3-eninos como plataformas conjuntivas con haluros de alquilo y arilo.
  • Empleando un relé radical alternativo de filicidad seguido de una captura radical selectiva.

Principales resultados:

  • Permitió la formación de tres o más enlaces C-C a través de una adición radical secuencial y un mecanismo de captura.
  • Los estudios experimentales y teóricos aclararon la vía de reacción, incluidas las adiciones radicales a los sistemas π.
  • Demostró la formación de moléculas complejas a través de una reacción de acoplamiento de cinco componentes.

Conclusiones:

  • El acoplamiento conjuntivo doble desarrollado ofrece una estrategia versátil para construir arquitecturas moleculares complejas.
  • La reacción proporciona una herramienta poderosa para los químicos sintéticos, superando las limitaciones en la formación de enlaces C-C.
  • El estudio destaca el potencial de la catálisis del níquel para lograr transformaciones sintéticas desafiantes.