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Electromagnetic Fields01:30

Electromagnetic Fields

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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of...
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Energy Carried By Electromagnetic Waves01:22

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Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
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Batteries and Fuel Cells03:12

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Short-distance Transport of Resources02:12

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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Calculation of Electric Flux01:25

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Consider the electric field of an oppositely charged, parallel-plate system and an imaginary box between those plates. Let the bottom face of the box be ABCD, and the top face be FGHK. The electric field between the plates is uniform and points from the positive plate toward the negative plate. The calculation of this field's flux through the box's various faces shows that the net flux through the box is zero. Why does the flux cancel out here?
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Energy Line and Hydraulic Gradient Line01:27

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Based on Bernoulli's equation, the energy line (EL) and hydraulic grade line (HGL) provide graphical representations of energy distribution in a fluid flow system. For steady, incompressible, inviscid flows, Bernoulli's equation is expressed as:
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Implementation of Portable Emissions Measurement Systems PEMS for the Real-driving Emissions RDE Regulation in Europe
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Transporte en futuros de cero emisiones netas: Perspectivas del estudio de intercomparación de modelos EMF-37

Christopher Hoehne1, Matteo Muratori1,2, John Bistline3

  • 1National Renewable Energy Laboratory, Golden, CO, USA.

Energy and climate change
|January 8, 2026
PubMed
Resumen

Lograr cero emisiones netas requiere cambios significativos en el sector del transporte de EE. UU. La sustitución de tecnología, como los vehículos eléctricos (VE), es clave, con diversas soluciones para el transporte pesado como biocombustibles e hidrógeno.

Palabras clave:
transportecero emisiones netasvehículos eléctricosbiocombustibleshidrógeno

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Área de la Ciencia:

  • Ciencias ambientales
  • Mitigación del cambio climático
  • Análisis de sistemas de transporte

Sus antecedentes:

  • El transporte es la mayor fuente de emisiones de dióxido de carbono (CO2) en EE. UU., y contribuye aproximadamente a un tercio del total.
  • Lograr cero emisiones netas a mediados de siglo requiere reducciones sustanciales tanto en el transporte de pasajeros como de carga.

Objetivo del estudio:

  • Explorar el papel del sector del transporte en escenarios destinados a lograr cero emisiones netas de CO2 en toda la economía para 2050.
  • Identificar estrategias y tecnologías clave para la descarbonización del transporte en EE. UU.

Principales métodos:

  • Se utilizó un estudio de intercomparación de modelos para analizar varios escenarios de cero emisiones netas.
  • Se evaluaron las contribuciones potenciales de las reducciones del lado de la demanda, la sustitución de tecnología y el cambio de modo.

Principales resultados:

  • Se proyecta que el sector del transporte de EE. UU. será crucial para las reducciones de emisiones del lado de la demanda, principalmente a través de la sustitución de tecnología.
  • Se espera que los vehículos de pasajeros en carretera transiten en gran medida hacia vehículos eléctricos (VE).
  • La descarbonización de los modos de transporte más pesados muestra diversas soluciones, incluido un mayor uso de biocombustibles líquidos e hidrógeno.

Conclusiones:

  • La sustitución de tecnología, en particular la electrificación de vehículos de pasajeros, es un motor principal para la descarbonización del transporte en EE. UU.
  • Se necesita más investigación sobre biocombustibles, hidrógeno para transporte pesado y cambios de comportamiento para apoyar la descarbonización.
  • Abordar las emisiones del transporte es vital para lograr los objetivos nacionales de cero emisiones netas, pero requiere una planificación cuidadosa de la demanda de combustible limpio y electricidad.