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 16 of 16 for “"Atmospheric particles"”.
-
Scavenging of atmospheric particles by water drops
… the collection efficiency of submicron aerosol particles are studied. It is assumed that the intermolecular forces provide a certain region as an absorbent surface in the vicinity of the drop. Numerical results have been obtained for the cases of a water drop collecting AgCl aerosols and a water …
-
Understanding the chemistry of atmospheric particles using single particle mass spectrometry
… ) UV laser pulses to vaporize and ionize single particles and measures their mass spectra using a time-of-flight mass spectrometer. Near-term and long-term hardware improvements as well as advanced data analysis techniques are explored in order to extract new chemical information from the thus …
-
Analysis of Strobilurin Fungicides, Neonicotinoid Insecticides and Degradation Products in Atmospheric Particles
… strobilurin fungicides in the particle phase of atmospheric samples. Detection limits ranged from 0.5 to 3 ng/mL and the recovery percent ranged between 83.5% to 108.3% with relative standard deviation <13% for all analytes. The sampling site was located in Omak, WA within the Okanogan County …
-
Mass, Composition, Source Identification and Impact Assessment for Fine and Coarse Atmospheric Particles in the Desert Southwest
… to the site. Chemical analysis of ambient particles and local feedlot material shows the presence of chemical marker species including phosphate which is unique to this source. Fugitive dust is a significant contributor to ambient particulate matter concentrations at all monitoring …
-
Investigation of the evolution of atmospheric particles with integration of the stochastic particle-resolved model PartMC-MOSAIC and atmospheric measurements
Atmospheric aerosols are known to have strong impacts on human health, visibility and the climate system. They originate directly from either anthropogenic or natural emission, or can be also formed through gas- particle conversion processes. Aerosol particles in the atmosphere often represent a …
-
Reactive uptake of O₃ and N₂O₅ on organic mixtures and inorganic solutions coated with organic monolayers
Atmospheric particles play a crucial role in climate, visibility, air pollution, and human health. Reactions between gas-phase molecules and particles (heterogeneous reactions) affect not only the particle composition and morphology, but also the composition of the atmosphere. This thesis …
-
The weathering of sandstone, with particular reference to buildings in the West Midlands, UK
… mechanisms, associated with the deposition of atmospheric particles, hydrolysis of silicates and the formation of salts, operate on this sandstone. An exposure trial examined the influence of different environmental conditions upon these weathering mechanisms. No statistically significant …
-
An Analysis of 12 GHz low angle radiometric data
… sky noise temperature. Attenuation caused by atmospheric particles (rain, ice, oxygen, etc.) can be predicted from the sky noise temperature. Three years of data (1979-1981) were available for data reduction and analysis. From this data a model is developed to predict attenuation from sky …
-
A Study of the Intermediate-Range Transport of Secondary Acidic Species
… of an instrument to separate submicron atmospheric particles, (2) Field sampling and chemical analyses of submicron particles to obtain elemental and ionic concentrations, (3) Determination of a tracer for coal-fired power plants by factor analysis of the chemical data, and (4) …
-
Arctic Aerosol Sources and Continental Organic Aerosol Hygroscopicity
Atmospheric particles can affect climate directly, by scattering solar radiation, or indirectly, by acting as the seed upon which cloud droplets form. These clouds can then cool the earth's surface by reflecting incoming sunlight. In order to constrain the large uncertainties in predicting the …
-
Characterisation of atmospheric single particles in industrial and regional background environments using aerosol time of flight mass spectrometry
The composition of atmospheric particles is an important factor in determining their impact on climate and health. In this study, an aerosol time-of-flight mass spectrometer (ATOFMS) was used to measure the chemical composition of ambient single particles at two contrasting locations – an …
-
Real time analysis of atmospheric single particles in urban environments using aerosol time of flight mass spectrometry
… the size-resolved chemical composition of single particles in real-time an ATOFMS was deployed at urban background sites in Paris and Barcelona during the MEGAPOLI and SAPUSS monitoring campaigns respectively. The particle types detected during MEGAPOLI included several carbonaceous species, …
-
Imaging and analysis of natural and manufactured nanoparticles
… fish ecotoxicology of fullerenes. Nanoscale atmospheric particles were imaged and analysed with AFM. Additionally, a pilot study on metal speciation in SWCNTaq was conducted to determine partitioning of Ni, Y, Cd, Cu and Cr between particle-bound, labile and dissolved fractions with a view to …
-
Cosmic-ray neutron sensing for soil moisture measurements in cropped fields
… penetrate the top atmosphere and interact with atmospheric particles. Such interaction results on a cascade of high-energy neutrons, which continue traveling through the atmospheric column. Finally, neutrons penetrate the soil surface and a second cascade is produced with the so-called secondary …
-
Uncertainties in space-based estimates of clouds and precipitation: implications for deriving global diabatic heating
… it receives. A further 112 Wm-2 is reflected by atmospheric particles, clouds, and the surface, leaving 230 Wm-2 to be absorbed by the ocean. At thermal wavelengths, it is found that the ocean emits 436 W m-2 of energy to the atmosphere while the atmosphere emits a total of 639 Wm-2 units, 407 …