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Showing 1 to 16 of 16 for “"Trace species"”.
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Evaluation of GLO: a Solar Occultation Instrument for Measuring Atmospheric Trace Species on CubeSat Missions
… of the vertical profile of atmospheric trace species to determine radiative influences. This technology improves SWAP (Size, Weight, And Power) over heritage SOFIE and HALOE instruments and provides a cost-effective alternative for solar occultation limb monitoring. A python script was …
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Modeling the evolution of trace species in the post-combustor flow path of gas turbine engines
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Validation of modeling methodology and investigation of mass addition effects on evolution of trace species in post-combustor flow path
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Coupled radiation transport and mobile depletion for health physics and environmental impact applications
… radiation transport solver and a radionuclide trace species transport solver in the MOOSE framework for Caribou. This radiation transport solver is compared to several benchmark problems to determine its accuracy with and without ray effect mitigation measures, finding good agreement with all …
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A study of the tropospheric oxidation of volatile organic compounds using chemical ionization mass spectrometry
… mechanistic information for a wide variety of species. The gas-phase chemistry of the troposphere is dominated by the oxidation of trace species such as methane. One important intermediate in the oxidation of methane is the methylperoxy radical (CH302). The kinetic rate coefficient of the …
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Numerical optimization of ion transport in electrospray mass spectrometry
… ability to preserve the structure of ionized species without fragmentation. It is thus important that we fully understand and characterize the processes in order to correctly utilize its advantages. Proposed studies have called for the use of electrospray ionization to investigate trace …
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Laboratory measurements and modeling of trace atmospheric species
Trace species play a major role in many physical and chemical processes in the atmosphere. Improving our understanding of the impact of each species requires a combination of laboratory exper- imentation, field measurements, and modeling. The results presented here focus on spectroscopic and …
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Modeling reactive rarefied systems using a novel quasi-particle Boltzmann solver
… but struggles to resolve transient flows, trace species, and high level internal energy states due to stochastic noise. Quasi-Particle Simulation (QuiPS) is a novel Boltzmann solver that describes a system with a discretized, truncated velocity distribution function. The resulting …
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A Radiative Model for the Study of the Feedback Mechanism between Photolytic Aerosols and Solar Radiation
… proposed and improved. Tropospheric ChTMs for trace species are detailed numerical formulations intended to represent the atmospheric system as a whole, accounting for all the individual processes and phenomena that influence climate changes. The development of computer resources and the …
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Supercontinuum radiation for ultra-high sensitivity liquid-phase sensing
The real-time detection of trace species is key to a wide range of applications such as on-line chemical process analysis, medical diagnostics, identification of environmentally toxic species and atmospheric pollutant sensing. There is a growing demand for suitable techniques that are not only …
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Insights on the reactivity of environmental iron-containing nanoparticles.
… including redox reactions and adsorption of trace species. Ferrihydrite (Fe5HO8*4H2O) is a metastable iron oxide that forms particles in the 3-10 nm size range and is believed to be a major player in the environment. The reactivity of ferrihydrite is influenced by the available surface area …
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Retrieval of trace gases vertical profile in the lower atmosphere combining. Differential Optical Absorption Spectroscopy with radiative transfer models
… retrieve profile information for the atmospheric trace constituents nitrogen dioxide (NO2) and ozone (O3) in the lower troposphere from remote sensing measurements. The remote sensing technique used, referred to as Multiple AXis Differential Optical Absorption Spectroscopy (MAX-DOAS), is a recent …
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Urban-scale impacts on the global-scale composition and climate effects of anthropogenic aerosols
… and meteorological processing of highly reactive trace species in hypothetical urban areas, which is capable of efficiently simulating the urban concentration, surface deposition, and net mass flux of these species. A polynomial chaos expansion and the probabilistic collocation method have been …
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New Avenues in Atmospheric Modelling of Exoplanets
… molecular and atomic cross sections of various species prevalent in the atmospheres of such exoplanets in order to compute their spectra. The absorption cross sections were calculated through the broadening of spectral lines obtained from high resolution line lists. These cross sections and …
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Optimal determination of global tropospheric OH concentrations using multiple trace gases
… of removal for a variety of greenhouse gases and trace species that contribute to the destruction of the ozone layer. Accurate determination of global tropospheric OH concentrations [OH] is therefore a very important issue. Previous research at the global scale has focused on scaling …
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Observation of New Particle Formation in the Northern Hemisphere at Altitude from 4 to 20 km
… and/or advective transport. CO and O3 act as tracers of tropospheric and stratospheric air, respectively, their statistical relationship can be used to quantify air mass characteristics and origins. The mixing ratio values of CO increased within the upper troposphere layer before/during NPF …