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Related Concept Videos

Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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A Simple Physical Model for High Power Enrichment Emissions.

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  • 1a CE-CERT, University of California , Riverside , California.

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A new model predicts carbon monoxide (CO) emissions from cars during high-power driving. This simplified approach uses a single parameter to represent fuel enrichment, improving regulatory accuracy.

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Area of Science:

  • Automotive Engineering
  • Environmental Science
  • Chemical Engineering

Background:

  • Carbon monoxide (CO) emissions are a significant concern for conventional automobiles, particularly during high-power operations.
  • Accurate modeling of these emissions is crucial for effective regulatory strategies.
  • Existing models may require extensive parameterization, limiting their practical application.

Purpose of the Study:

  • To develop a parameterized physical model for predicting CO emissions from automobiles during high-power operation.
  • To minimize the number of parameters required for accurate emission prediction.
  • To establish an approximate mathematical formula for CO emission rates as a function of air-fuel ratio.

Main Methods:

  • Developed a CO emission model by integrating a fuel consumption model with a vehicle enrichment behavior description.
  • Utilized steady-state measurements from 29 vehicles (Environmental Protection Agency Laboratory) and hard acceleration data from 10 vehicles (California Air Resources Board).
  • Focused on identifying a minimal set of parameters to represent the vehicle's command enrichment behavior.

Main Results:

  • Established an approximate mathematical formula relating CO emission rates to fuel consumption and air-fuel ratio.
  • Demonstrated that a single parameter, representing enrichment strength, can provide fairly accurate results.
  • Successfully modeled CO emissions based on fuel consumption and vehicle enrichment characteristics.

Conclusions:

  • A minimally parameterized physical model can effectively predict CO emissions during high-power automobile operation.
  • The simplified model aids in improving regulatory modeling accuracy.
  • Further research can build upon this approach for more comprehensive emissions analysis.