Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 72 for “"Aerosol Particles"”.
-
Vapor scavenging by atmospheric aerosol particles
… computational techniques. Vapor scavenging by particles is an important physical process in the atmosphere because it can result in changes to particle properties (e.g., size, shape, composition, and activity) and, thus, influence atmospheric phenomena in which particles play a role, such as …
-
Parametric and structural uncertainties in modeling dry deposition of atmospheric aerosol particles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
-
Supermicron-size aerosol particles originating from biomass burning in south-central Africa
During the 2017 & 2018 Observations of Aerosols Above Clouds and their Interactions (ORACLES) field campaign, the NASA P3-Orion was equipped with a 2D-Stereo (2D-S) probe that contains 128 diodes that are 10 µm in size nominally measuring particles with sizes ranging from 5 µm < D < 1280 µm. The …
-
Understanding the Sources, Atmospheric Evolution and Radiative Effect of Brown Carbon Aerosol Particles
Organic aerosols (OA) have long been thought to only scatter incoming solar radiation and have a cooling effect on climate. However, a fraction of OA, referred to as brown carbon (BrC), absorbs light in the lower visible to ultraviolet range. BrC can be emitted from incomplete combustions and can …
-
Fluorescent Biological Aerosol Particles in Coastal Canada and the Link to Atmospheric Ice Nuclei
<p>Bioaerosols are a subgroup of atmospheric aerosols and are often linked to the spread of human, animal and plant diseases. Bioaerosols also may play an indirect effect on environmental processes, including the formation of precipitation and alteration of the global climate through their role as …
-
Characterization of the physical, chemical, and optical properties of atmospheric aerosol particles in New Hampshire
<p>Tropospheric aerosol particles directly affect the radiative budget of the Earth, and degrade visibility, by scattering and absorbing short-wavelength solar radiation. However, the radiative effect of aerosols is highly uncertain due to the non-uniform spatial distribution of the particles over …
-
Microphysical retrieval of non-spherical aerosol particles using regularized inversion of multi-wavelength lidar data
… past century make a clear case of the impact of aerosols and clouds, identified as sources of largest uncertainty in climate projections. Earth’s radiation balance is altered by aerosols depending on their size, morphology and chemical composition. Competing effects in the atmosphere can be …
-
Development of an Experimental System to Generate and Characterize Supersonic Aerosol Particles Using Laser Doppler Velocimetry
… high-speed flight vehicle encounters with aerosols and the surface damage resulting from particle impacts during flight. To investigate and characterize the damage potential of aerosol particles at flight speeds, a bench-top system was developed. This system is characterized in this thesis …
-
Controlled Generation of Uniform Solid Aerosol Particles With Radii in the 0.5 to 20.0 Micron Range
Made available in DSpace on 2014-12-10T19:06:45Z (GMT). No. of bitstreams: 1 7206858.pdf: 3122193 bytes, checksum: 339996a14eb69b7a02415e6b3fa38bc7 (MD5) Previous issue date: 1971
-
Aerosol Optical Properties and the Influence of Particulate Organic Matter
… from this research on ambient and laboratory aerosols, it can be concluded that (1) presence of organic compounds (i.e., glutaric and succinic acids) decrease the hygroscopic growth of aerosol particles when compared with aerosol particles composed of pure inorganic compounds (i.e., sodium …
-
Investigations of cloud altering effects of atmospheric aerosols using a new mixed Eulerian-Lagrangian aerosol model
… composition and size-distribution of atmospheric aerosol particles over the last century. This, in turn, has altered cloud albedo, lifetime, and patterns which together are thought to exert a negative radiative forcing on the climate; these are the indirect effects of atmospheric aerosols. The …
-
Aircraft based measurements of atmospheric Sulfur Dioxide and ground based measurements of gaseous Sulfur (VI) in the simulated internal flow of an aircraft engine: Implications for atmospheric aerosol formation
… promote the formation and growth of sulfate aerosol particles which play an important role in the chemistry of the troposphere and perhaps even in climate. An Ion Trap Mass Spectrometer specially adapted for in flight measurements was employed in the aircraft campaign. Several high resolution …
-
Inversion of Light Scattering Measurements for Particle Size and Optical Constants
… determining the size and optical properties of aerosol particles. Laser light scattering techniques can be used unobtrusively in harsh environments, so the development and improvement of these techniques is of great interest. The primary difficulty associated with light scattering techniques is …
-
Iron Reduction in Soot
… of reactive oxygen species (ROS) from ambient particles emitted during the incomplete combustion of fossil and biomass fuels. Although ROS are known to induce unhealthy oxidative stress in cellular systems, the mechanisms of Fe(II) formation and stabilization in aerosol particles are still not …
-
Characterisation of Microphysical and Optical Properties of Atmospheric Aerosols in a High Arctic environment: Villum Research Station, NE Greenland
Atmospheric aerosols are solid or liquid phase particles which are suspended in ambient air. These particles have an impact on the climate through direct and indirect radiative forcing, and their measurement presents challenges in high latitude environments where concentrations may fall under the …
-
Design and Numerical Simulation of the Real-time Particle Charge and Size Analyser
The electrostatic charge and size distribution of aerosol particles play a very important role in many industrial applications. Due to the complexity and the probabilistic nature of the different charging mechanisms often acting simultaneously, it is difficult to theoretically predict the charge …
-
Aerosol particle light scattering at a perturbed mid-latitude continental northern hemisphere site and its dependence on relative humidity, wavelength of light, particle size and composition
Recent model predictions indicate that sulfate aerosol particles cause radiative forcing of the same magnitude but of opposite sign than the forcing caused by anthropogenic greenhouse gases. The spatial and temporal variability of parameters used in the models are highly uncertain resulting in …
-
Charge and momentum transfer processes for gas-phase nanoparticles.
Charge and momentum transfer processes between aerosol particles and gas molecules proceed via collisions. There is a need to better understand such collision driven phenomena in order to predict particle dynamics and growth processes. This dissertation consists of two research projects focusing on …
Page 1 of 4