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Related Concept Videos

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.
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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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Updated: Jan 13, 2026

Implementation of Portable Emissions Measurement Systems PEMS for the Real-driving Emissions RDE Regulation in Europe
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Transportation in Net-Zero Emissions Futures: Insights from the EMF-37 Model Intercomparison Study.

Christopher Hoehne1, Matteo Muratori1,2, John Bistline3

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

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Achieving net-zero emissions requires significant U.S. transportation sector changes. Technology substitution, like electric vehicles (EVs), is key, with diverse solutions for heavier transport like biofuels and hydrogen.

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Area of Science:

  • Environmental science
  • Climate change mitigation
  • Transportation systems analysis

Background:

  • Transportation is the largest source of U.S. carbon dioxide (CO2) emissions, contributing about one-third of the total.
  • Achieving mid-century net-zero emissions necessitates substantial reductions in both passenger and freight transportation.

Purpose of the Study:

  • To explore the role of the transportation sector in scenarios aimed at achieving economy-wide net-zero CO2 emissions by 2050.
  • To identify key strategies and technologies for decarbonizing U.S. transportation.

Main Methods:

  • Utilized a model intercomparison study to analyze various net-zero emission scenarios.
  • Evaluated the potential contributions of demand-side reductions, technology substitution, and mode shifting.

Main Results:

  • The U.S. transport sector is projected to be crucial for demand-side emission reductions, primarily through technology substitution.
  • Passenger on-road vehicles are expected to transition largely to electric vehicles (EVs).
  • Decarbonizing heavier transport modes shows diverse solutions, including increased use of liquid biofuels and hydrogen.

Conclusions:

  • Technology substitution, particularly electrification of passenger vehicles, is a primary driver for decarbonizing U.S. transportation.
  • Further research is needed on biofuels, hydrogen for heavy transport, and behavioral changes to support decarbonization.
  • Addressing transportation emissions is vital for achieving national net-zero goals, but requires careful planning for clean fuel and electricity demand.