You searched for subject:(Aerosols).
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University of Georgia
1.
Lacke, Matthew C.
Aerosols and associated precipitation patterns in Atlanta.
Degree: MS, Geography, 2007, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/lacke_matthew_c_200708_ms 
► The role of aerosol concentrations on summer precipitation was examined in Atlanta, GA, for 2003-04. Thursday had the highest average 2.5 µm particulate matter (PM…
(more)
▼ The role of aerosol concentrations on summer precipitation was examined in Atlanta, GA, for 2003-04. Thursday had the highest average 2.5 µm particulate matter (PM 2.5) concentrations at two of three Environmental Protection Agency stations. Monday and Thursday had the largest area of significantly different precipitation when compared to other days of the week. All but the southeast quadrant of the metropolitan area had a significant difference in precipitation on high versus low aerosol days. High aerosol days had greater instability (higher average convective available potential energy and lower convective inhibition), and a slightly shallower mixing layer when compared to low aerosol days. Most of metropolitan Atlanta had higher precipitation amounts on high aerosol days and was significantly different from low aerosol days.
Advisors/Committee Members: Thomas L. Mote.
Subjects/Keywords: Aerosols
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APA (6th Edition):
Lacke, M. C. (2007). Aerosols and associated precipitation patterns in Atlanta. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/lacke_matthew_c_200708_ms
Chicago Manual of Style (16th Edition):
Lacke, Matthew C. “Aerosols and associated precipitation patterns in Atlanta.” 2007. Masters Thesis, University of Georgia. Accessed February 24, 2020.
http://purl.galileo.usg.edu/uga_etd/lacke_matthew_c_200708_ms.
MLA Handbook (7th Edition):
Lacke, Matthew C. “Aerosols and associated precipitation patterns in Atlanta.” 2007. Web. 24 Feb 2020.
Vancouver:
Lacke MC. Aerosols and associated precipitation patterns in Atlanta. [Internet] [Masters thesis]. University of Georgia; 2007. [cited 2020 Feb 24].
Available from: http://purl.galileo.usg.edu/uga_etd/lacke_matthew_c_200708_ms.
Council of Science Editors:
Lacke MC. Aerosols and associated precipitation patterns in Atlanta. [Masters Thesis]. University of Georgia; 2007. Available from: http://purl.galileo.usg.edu/uga_etd/lacke_matthew_c_200708_ms
University of Georgia
2.
Wiegand, Joseph Richard.
The development, calibration, and implementation of a UV-visible photoacoustic spectrophotometer.
Degree: MS, Chemistry, 2014, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/wiegand_joseph_r_201408_ms
► A multitude of techniques have been developed to measure the absorption of light by aerosols, but the techniques capable of making UV measurements are prone…
(more)
▼ A multitude of techniques have been developed to measure the absorption of light by
aerosols, but the techniques capable of making UV measurements are prone to artifacts. Photoacoustic spectrometry (PAS) provides an in-situ direct measurement of the absorption of light by aerosol particles. A novel PAS system was developed with the ability to make absorption measurements ranging from 300-700 nm. Light from a Hg arc lamp is filtered to eight separate wavelength bands centered at 301 nm, 314 nm, 364 nm, 405 nm, 436 nm, 546 nm, 578 nm, 687 nm. After the completion of a gas-phase calibration, these wavelengths bands, with the expectation of 687 nm, feature detection limits capable of making ambient aerosol measurements. These measurements allow for an unique approach for data prorogation is in order to better represent the optical properties of absorbing
aerosols.
Advisors/Committee Members: Geoffrey Smith.
Subjects/Keywords: aerosols
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APA (6th Edition):
Wiegand, J. R. (2014). The development, calibration, and implementation of a UV-visible photoacoustic spectrophotometer. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/wiegand_joseph_r_201408_ms
Chicago Manual of Style (16th Edition):
Wiegand, Joseph Richard. “The development, calibration, and implementation of a UV-visible photoacoustic spectrophotometer.” 2014. Masters Thesis, University of Georgia. Accessed February 24, 2020.
http://purl.galileo.usg.edu/uga_etd/wiegand_joseph_r_201408_ms.
MLA Handbook (7th Edition):
Wiegand, Joseph Richard. “The development, calibration, and implementation of a UV-visible photoacoustic spectrophotometer.” 2014. Web. 24 Feb 2020.
Vancouver:
Wiegand JR. The development, calibration, and implementation of a UV-visible photoacoustic spectrophotometer. [Internet] [Masters thesis]. University of Georgia; 2014. [cited 2020 Feb 24].
Available from: http://purl.galileo.usg.edu/uga_etd/wiegand_joseph_r_201408_ms.
Council of Science Editors:
Wiegand JR. The development, calibration, and implementation of a UV-visible photoacoustic spectrophotometer. [Masters Thesis]. University of Georgia; 2014. Available from: http://purl.galileo.usg.edu/uga_etd/wiegand_joseph_r_201408_ms
Rutgers University
3.
Nguyen, Thien Khoi V., 1989-.
Aerosol liquid water: measurement, trends, and implications for atmosphere-biosphere interactions.
Degree: PhD, Environmental Sciences, 2016, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/50110/
► Particle-phase liquid water is a ubiquitous and abundant component of atmospheric aerosols and influences hydrological cycling, fate and transport of trace species, visibility, human health,…
(more)
▼ Particle-phase liquid water is a ubiquitous and abundant component of atmospheric aerosols and influences hydrological cycling, fate and transport of trace species, visibility, human health, and regional climate. Aerosol water mass concentrations are functions of relative humidity (RH), temperature, and aerosol concentration and composition. Previous studies focused on inorganic species, and their relationships to particle hygroscopicity are included in atmospheric models. But there is a dearth of field studies and related ambient information pertaining to water modulation by organic compounds and vice versa. The extent to which water facilitates transfer of biogenically derived carbon from the gas to particle phase to form secondary organic aerosol (SOA), which contributes to the fine particle matter (PM2.5) burden, is poorly constrained. My dissertation aims to 1) better understand the chemical and thermodynamic controls on aerosol water in the Southeast U.S., an area known to contain high concentrations of SOA, through instrument development and field measurements, 2) quantify the temporal, spatial, and aloft trends in aerosol water through observational estimates, and 3) reconcile discrepancies between existing surface and satellite measurements of PM across the continental U.S. using aerosol water. My field measurements of aerosol water found a minimum of 7% water in particles by volume and a diel cycle in water content controlled, in part, by aerosol hygroscopicity, that ranged from 1-5 µg m-3. Next, semi-observational estimates of aerosol water by an inorganic thermodynamic model discovered that aerosol water mass has decreased in the Southeast by 79% between 2001-2012. Similar reductions of biogenically derived SOA mass in the area are consistent with an aerosol water-mediated mechanism and the correlation in water and SOA mass is statistically robust. Finally, estimates of aerosol water across the continental U.S. yield seasonal differences that were highest in the Southeast and modulated by aerosol chemistry and not RH. Near surface trends in aerosol water are qualitatively similar to space-based aerosol optical thickness measurements and potentially resolve surface and satellite PM measurements. Ultimately, this work contributes to improving our understanding of the connections among aerosol water, biogenic and anthropogenic emissions, and biogenic SOA formed in the presence of anthropogenic perturbations.
Advisors/Committee Members: Carlton, Ann Marie G. (chair), Turpin, Barbara J. (internal member), Mainelis, Gediminas (internal member), Petters, Markus D. (outside member).
Subjects/Keywords: Aerosols; Atmospheric aerosols
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APA (6th Edition):
Nguyen, Thien Khoi V., 1. (2016). Aerosol liquid water: measurement, trends, and implications for atmosphere-biosphere interactions. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/50110/
Chicago Manual of Style (16th Edition):
Nguyen, Thien Khoi V., 1989-. “Aerosol liquid water: measurement, trends, and implications for atmosphere-biosphere interactions.” 2016. Doctoral Dissertation, Rutgers University. Accessed February 24, 2020.
https://rucore.libraries.rutgers.edu/rutgers-lib/50110/.
MLA Handbook (7th Edition):
Nguyen, Thien Khoi V., 1989-. “Aerosol liquid water: measurement, trends, and implications for atmosphere-biosphere interactions.” 2016. Web. 24 Feb 2020.
Vancouver:
Nguyen, Thien Khoi V. 1. Aerosol liquid water: measurement, trends, and implications for atmosphere-biosphere interactions. [Internet] [Doctoral dissertation]. Rutgers University; 2016. [cited 2020 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/50110/.
Council of Science Editors:
Nguyen, Thien Khoi V. 1. Aerosol liquid water: measurement, trends, and implications for atmosphere-biosphere interactions. [Doctoral Dissertation]. Rutgers University; 2016. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/50110/
Oregon State University
4.
Brown, Daniel A.
Effects of aerosols on the properties of deep convective clouds.
Degree: MS, Atmospheric Sciences, 2010, Oregon State University
URL: http://hdl.handle.net/1957/16197
► Aerosols are tiny particles that serve as nuclei for cloud droplet and ice crystal formation. Increases in aerosol concentration lead to clouds with smaller but…
(more)
▼ Aerosols are tiny particles that serve as nuclei for cloud droplet and ice crystal formation. Increases in aerosol concentration lead to clouds with smaller but more numerous droplets. Some recent studies have found evidence that ice crystal size in deep convective clouds is also reduced by elevated aerosol concentrations. In this study, aerosol, cloud, and radiation data in the Clouds and Earth’s Radiant Energy System (CERES) Single Satellite Footprint (SSF) datastream are used to examine the findings of the earlier studies. Three years of CERES observations were used to survey the Earth for
aerosols and deep convective clouds. A CERES field of view (FOV) was taken to contain a deep convective cloud if the 11-micron brightness temperature was below 210 K. To ensure that the cloud was in a region of active convection, the cloud had to be opaque at 11 microns. South America, Equatorial Africa, and the Northern Indian Ocean exhibited relatively high frequencies of deep convective clouds and contained high aerosol burdens. For each day, within each geographic region, 2° × 2° latitude × longitude regions that contained both deep convective clouds and aerosol retrievals were examined. If within a 10° × 10° region on a given day, two or more of the 2° × 2° regions were found, the differences in the properties of the clouds collocated with the large and small aerosol burdens were calculated. Differences in cloud properties were compared to simultaneous differences in aerosol burdens. This strategy ensured that the clouds and
aerosols existed simultaneously and that the clouds with large aerosol burdens shared similar large-scale meteorology as those with small aerosol burdens. No link was found between the differences in aerosol burdens and deep convective cloud properties in any of the regions and seasons analyzed. Relationships among ice crystal size, cloud optical depth, and 11-micron brightness temperature were also investigated. Ice crystal diameter was found to decrease with decreasing cloud temperature. Likewise, cloud optical depth increased with decreasing cloud temperature. Such relationships among cloud properties and the inclusion of semitransparent clouds in earlier studies may explain why the findings of this study differ from those of earlier studies.
Advisors/Committee Members: Coakley, James A. (advisor), Shell, Karen (committee member).
Subjects/Keywords: aerosols; Aerosols – Environmental aspects
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APA (6th Edition):
Brown, D. A. (2010). Effects of aerosols on the properties of deep convective clouds. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/16197
Chicago Manual of Style (16th Edition):
Brown, Daniel A. “Effects of aerosols on the properties of deep convective clouds.” 2010. Masters Thesis, Oregon State University. Accessed February 24, 2020.
http://hdl.handle.net/1957/16197.
MLA Handbook (7th Edition):
Brown, Daniel A. “Effects of aerosols on the properties of deep convective clouds.” 2010. Web. 24 Feb 2020.
Vancouver:
Brown DA. Effects of aerosols on the properties of deep convective clouds. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/1957/16197.
Council of Science Editors:
Brown DA. Effects of aerosols on the properties of deep convective clouds. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/16197
Oregon State University
5.
Dobie, Norman Dale.
Thermo-aerosol fumigation to increase the fungitoxicity of chloropicrin in storage house disinfestation.
Degree: PhD, Botany, 1954, Oregon State University
URL: http://hdl.handle.net/1957/51697
Subjects/Keywords: Aerosols
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APA (6th Edition):
Dobie, N. D. (1954). Thermo-aerosol fumigation to increase the fungitoxicity of chloropicrin in storage house disinfestation. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/51697
Chicago Manual of Style (16th Edition):
Dobie, Norman Dale. “Thermo-aerosol fumigation to increase the fungitoxicity of chloropicrin in storage house disinfestation.” 1954. Doctoral Dissertation, Oregon State University. Accessed February 24, 2020.
http://hdl.handle.net/1957/51697.
MLA Handbook (7th Edition):
Dobie, Norman Dale. “Thermo-aerosol fumigation to increase the fungitoxicity of chloropicrin in storage house disinfestation.” 1954. Web. 24 Feb 2020.
Vancouver:
Dobie ND. Thermo-aerosol fumigation to increase the fungitoxicity of chloropicrin in storage house disinfestation. [Internet] [Doctoral dissertation]. Oregon State University; 1954. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/1957/51697.
Council of Science Editors:
Dobie ND. Thermo-aerosol fumigation to increase the fungitoxicity of chloropicrin in storage house disinfestation. [Doctoral Dissertation]. Oregon State University; 1954. Available from: http://hdl.handle.net/1957/51697
6.
Zhang, Lu.
Design and numerical simulation of the real-time particle charge and size analyser.
Degree: PhD, University of Glamorgan, 2012, University of South Wales
URL: http://hdl.handle.net/10265/567
► 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…
(more)
▼ 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 distribution of aerosol particles or even
estimate the relative effect of the different mechanisms. Therefore, it is necessary to
measure the size and also the bipolar charge distribution on aerosol particles.
The main aim of this research project was to design, implement and simulate a
signal processing system for novel, fully functional measurement instrument capable of
simultaneously measuring in real time the bipolar charge and size distribution of medical
aerosols. The Particle Size and Charge Analyser (PSCA), investigated in this thesis, uses
Phase Doppler Anemometry (PDA) technique. The PDA system was used to track the
motion of charged particles in the presence of an electric field. By solving the equation of
particle motion in a viscous medium combined with the simultaneous measurement of its
size and velocity, the magnitude as well as the polarity of the particle charge can be
obtained. Different signal processing systems in different excitation fields have been designed and implemented. These systems include: velocity estimation system using
spectral analysis in DC excitation field, velocity estimation system based on Phase Locked
Loop (PLL) technique working in DC as well as sine-wave excitation fields, velocity
estimation system based on Quadrature Demodulation (QD) technique under sine-wave
excitation method, velocity estimation system using spectral analysis in square-wave
excitation field and phase shift estimation based on Hilbert transformation and correlation
technique in both sine-wave and square-wave excitation fields. The performances of these
systems were evaluated using Monte Carlo (MC) simulations obtained from the
synthesized Doppler burst signals generated from the mathematical models implemented
in MATLAB. The synthesized Doppler Burst Signal (DBS) was subsequently corrupted
with the added Gaussian noise. Cross validation of the results was performed using
hardware signal processing system employing Arbitrary Waveform Generator and also
NASA simulator to further confirm the validity of the estimation.
Subjects/Keywords: Aerosols; 681.761
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APA ·
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Manager
APA (6th Edition):
Zhang, L. (2012). Design and numerical simulation of the real-time particle charge and size analyser. (Doctoral Dissertation). University of South Wales. Retrieved from http://hdl.handle.net/10265/567
Chicago Manual of Style (16th Edition):
Zhang, Lu. “Design and numerical simulation of the real-time particle charge and size analyser.” 2012. Doctoral Dissertation, University of South Wales. Accessed February 24, 2020.
http://hdl.handle.net/10265/567.
MLA Handbook (7th Edition):
Zhang, Lu. “Design and numerical simulation of the real-time particle charge and size analyser.” 2012. Web. 24 Feb 2020.
Vancouver:
Zhang L. Design and numerical simulation of the real-time particle charge and size analyser. [Internet] [Doctoral dissertation]. University of South Wales; 2012. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/10265/567.
Council of Science Editors:
Zhang L. Design and numerical simulation of the real-time particle charge and size analyser. [Doctoral Dissertation]. University of South Wales; 2012. Available from: http://hdl.handle.net/10265/567
Oregon State University
7.
Sing, Edmond Lee.
Bacteriophage destruction by aerosols of dichloroisocyanuric acid and other germicides.
Degree: MS, Microbiology and Hygiene, 1962, Oregon State University
URL: http://hdl.handle.net/1957/49568
Subjects/Keywords: Aerosols
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APA (6th Edition):
Sing, E. L. (1962). Bacteriophage destruction by aerosols of dichloroisocyanuric acid and other germicides. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/49568
Chicago Manual of Style (16th Edition):
Sing, Edmond Lee. “Bacteriophage destruction by aerosols of dichloroisocyanuric acid and other germicides.” 1962. Masters Thesis, Oregon State University. Accessed February 24, 2020.
http://hdl.handle.net/1957/49568.
MLA Handbook (7th Edition):
Sing, Edmond Lee. “Bacteriophage destruction by aerosols of dichloroisocyanuric acid and other germicides.” 1962. Web. 24 Feb 2020.
Vancouver:
Sing EL. Bacteriophage destruction by aerosols of dichloroisocyanuric acid and other germicides. [Internet] [Masters thesis]. Oregon State University; 1962. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/1957/49568.
Council of Science Editors:
Sing EL. Bacteriophage destruction by aerosols of dichloroisocyanuric acid and other germicides. [Masters Thesis]. Oregon State University; 1962. Available from: http://hdl.handle.net/1957/49568
Oregon State University
8.
Tomine, Chris Shinya.
Integrated forward light scattering as a measure of aerosol mass concentration.
Degree: PhD, Mechanical Engineering, 1973, Oregon State University
URL: http://hdl.handle.net/1957/44801
► A mathematical model was developed that relates the ratio, R, of two light flux measurements to the mass concentration, m, of the atmospheric aerosol particles…
(more)
▼ A mathematical model was developed that relates the
ratio, R, of two light flux measurements to the mass concentration,
m, of the atmospheric aerosol particles between
a source of parallel light (e.g., the sun) and the measuring
system. R is defined as the ratio of the light fluxes
passing through the pinhole and open positions of an iris
diaphragm located in the focal plane of a lens system.
The following relationship between the two variables was
derived:
R = 1/(1 + Km)
where K is a constant that depends on the area of the lens
surface, the mean wavelength of the incident light, the
thickness of the turbid layer of air through which the
light travels, and the parameters of the assumed lunge
particle size distribution, including the specific gravity
of the aerosol. An experimental investigation was conducted under
limited laboratory conditions. The results were in agreement
with the functional form of the mathematically derived
relationship. Quantitative agreement was not achieved between
the experimental and mathematical values of K due to
the dissimilarities in the experimental and atmospheric
aerosol size distributions.
Advisors/Committee Members: Boubel, Richard W. (advisor), Falkenberry, D. (committee member).
Subjects/Keywords: Aerosols
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APA (6th Edition):
Tomine, C. S. (1973). Integrated forward light scattering as a measure of aerosol mass concentration. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/44801
Chicago Manual of Style (16th Edition):
Tomine, Chris Shinya. “Integrated forward light scattering as a measure of aerosol mass concentration.” 1973. Doctoral Dissertation, Oregon State University. Accessed February 24, 2020.
http://hdl.handle.net/1957/44801.
MLA Handbook (7th Edition):
Tomine, Chris Shinya. “Integrated forward light scattering as a measure of aerosol mass concentration.” 1973. Web. 24 Feb 2020.
Vancouver:
Tomine CS. Integrated forward light scattering as a measure of aerosol mass concentration. [Internet] [Doctoral dissertation]. Oregon State University; 1973. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/1957/44801.
Council of Science Editors:
Tomine CS. Integrated forward light scattering as a measure of aerosol mass concentration. [Doctoral Dissertation]. Oregon State University; 1973. Available from: http://hdl.handle.net/1957/44801
Oregon State University
9.
Yun, Kyung Woo.
An experimental investigation of aerosol coagulation in the shock tube: Aerosol coagulation in the shock tube.
Degree: PhD, Mechanical and Nuclear Engineering, 1970, Oregon State University
URL: http://hdl.handle.net/1957/45811
► Ammonium chloride aerosols of submicron size generated by condensation and dispersion methods were treated, shortly after aerosol charging, with shock waves originating from diaphragm pressure…
(more)
▼ Ammonium chloride
aerosols of submicron size generated by
condensation and dispersion methods were treated, shortly after aerosol
charging, with shock waves originating from diaphragm pressure
ratios of up to 5.75.
The fraction of the particulate matter remaining in suspension
after a given time was measured as an indication of coagulation rate.
The coagulation rate increased with increasing shock strength, but
the rate of increase became gradually less as the shock strength increased.
The initial particle concentration, the degree of dispersion, and
the polydispersity were three major factors that influenced the rate of
coagulation upon shock treatment. Organic vapors, i.e., acetone,
carbon tetrachloride, and acetic acid, stabilized the aerosol but their
presence enhanced the coagulation process upon shock treatment. The
presence of water vapor resulted in a slight increase of coagulation
rate, but the rate became relatively insensitive to increasing shock
strength.
Analysis of the particles showed substantial increases in size
and a distinct change in their distribution after shock treatments. The
experimental results could be explained in terms of increased particle
collision probability. A model for the increased collision probability
among particles in the shock tube was proposed. The total number of
collision per unit volume per unit time was expressed in terms of
particle size, particle number, and differential velocity acquired due
to the differential acceleration of the particles.
A vertically arranged shock tube was recommended for further
investigation in order to minimize the problem of particle reentrainment.
Advisors/Committee Members: Boubel, Richard W. (advisor).
Subjects/Keywords: Aerosols
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APA ·
Chicago ·
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APA (6th Edition):
Yun, K. W. (1970). An experimental investigation of aerosol coagulation in the shock tube: Aerosol coagulation in the shock tube. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/45811
Chicago Manual of Style (16th Edition):
Yun, Kyung Woo. “An experimental investigation of aerosol coagulation in the shock tube: Aerosol coagulation in the shock tube.” 1970. Doctoral Dissertation, Oregon State University. Accessed February 24, 2020.
http://hdl.handle.net/1957/45811.
MLA Handbook (7th Edition):
Yun, Kyung Woo. “An experimental investigation of aerosol coagulation in the shock tube: Aerosol coagulation in the shock tube.” 1970. Web. 24 Feb 2020.
Vancouver:
Yun KW. An experimental investigation of aerosol coagulation in the shock tube: Aerosol coagulation in the shock tube. [Internet] [Doctoral dissertation]. Oregon State University; 1970. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/1957/45811.
Council of Science Editors:
Yun KW. An experimental investigation of aerosol coagulation in the shock tube: Aerosol coagulation in the shock tube. [Doctoral Dissertation]. Oregon State University; 1970. Available from: http://hdl.handle.net/1957/45811
10.
Zhang, Lu.
Design and numerical simulation of the real-time particle charge and size analyser.
Degree: PhD, 2010, University of South Wales
URL: https://pure.southwales.ac.uk/en/studentthesis/design-and-numerical-simulation-of-the-realtime-particle-charge-and-size-analyser(fcbc8f66-9758-4c24-abbd-ccc14a28307f).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521624
► 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…
(more)
▼ 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 distribution of aerosol particles or even estimate the relative effect of the different mechanisms. Therefore, it is necessary to measure the size and also the bipolar charge distribution on aerosol particles. The main aim of this research project was to design, implement and simulate a signal processing system for novel, fully functional measurement instrument capable of simultaneously measuring in real time the bipolar charge and size distribution of medical aerosols. The Particle Size and Charge Analyser (PSCA), investigated in this thesis, uses Phase Doppler Anemometry (PDA) technique. The PDA system was used to track the motion of charged particles in the presence of an electric field. By solving the equation of particle motion in a viscous medium combined with the simultaneous measurement of its size and velocity, the magnitude as well as the polarity of the particle charge can be obtained. Different signal processing systems in different excitation fields have been designed and implemented. These systems include: velocity estimation system using spectral analysis in DC excitation field, velocity estimation system based on Phase Locked Loop (PLL) technique working in DC as well as sine-wave excitation fields, velocity estimation system based on Quadrature Demodulation (QD) technique under sine-wave excitation method, velocity estimation system using spectral analysis in square-wave excitation field and phase shift estimation based on Hilbert transformation and correlation technique in both sine-wave and square-wave excitation fields. The performances of these systems were evaluated using Monte Carlo (MC) simulations obtained from the synthesized Doppler burst signals generated from the mathematical models implemented in MATLAB. The synthesized Doppler Burst Signal (DBS) was subsequently corrupted with the added Gaussian noise. Cross validation of the results was performed using hardware signal processing system employing Arbitrary Waveform Generator and also NASA simulator to further confirm the validity of the estimation. It was concluded that the velocity estimation system based on spectral analysis in square-wave excitation field offers the best overall performance in terms of the working range, noise sensitivity and particle capture efficiency. The main reasons for the superiority of the square-wave excitation over the sine-wave excitation system are as follows: Firstly, in the square-wave field particles attain higher velocities and greater amplitudes of displacement, which increases their probability of crossing the measurement volume from various injection points. Secondly, the sine-wave excitation requires that the particle residence time in the measurement volume is at least equal to one period of the…
Subjects/Keywords: 681.761; Aerosols
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Manager
APA (6th Edition):
Zhang, L. (2010). Design and numerical simulation of the real-time particle charge and size analyser. (Doctoral Dissertation). University of South Wales. Retrieved from https://pure.southwales.ac.uk/en/studentthesis/design-and-numerical-simulation-of-the-realtime-particle-charge-and-size-analyser(fcbc8f66-9758-4c24-abbd-ccc14a28307f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521624
Chicago Manual of Style (16th Edition):
Zhang, Lu. “Design and numerical simulation of the real-time particle charge and size analyser.” 2010. Doctoral Dissertation, University of South Wales. Accessed February 24, 2020.
https://pure.southwales.ac.uk/en/studentthesis/design-and-numerical-simulation-of-the-realtime-particle-charge-and-size-analyser(fcbc8f66-9758-4c24-abbd-ccc14a28307f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521624.
MLA Handbook (7th Edition):
Zhang, Lu. “Design and numerical simulation of the real-time particle charge and size analyser.” 2010. Web. 24 Feb 2020.
Vancouver:
Zhang L. Design and numerical simulation of the real-time particle charge and size analyser. [Internet] [Doctoral dissertation]. University of South Wales; 2010. [cited 2020 Feb 24].
Available from: https://pure.southwales.ac.uk/en/studentthesis/design-and-numerical-simulation-of-the-realtime-particle-charge-and-size-analyser(fcbc8f66-9758-4c24-abbd-ccc14a28307f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521624.
Council of Science Editors:
Zhang L. Design and numerical simulation of the real-time particle charge and size analyser. [Doctoral Dissertation]. University of South Wales; 2010. Available from: https://pure.southwales.ac.uk/en/studentthesis/design-and-numerical-simulation-of-the-realtime-particle-charge-and-size-analyser(fcbc8f66-9758-4c24-abbd-ccc14a28307f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521624
Rutgers University
11.
Mukherjee, Pami, 1986-.
Investigation of chemical and physical processes on Arctic aerosols through a combined approach of field and laboratory studies.
Degree: PhD, Environmental Science, 2018, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/59332/
► The causes and effects of recent global warming have been studied extensively; but, the role of atmospheric aerosols in the Arctic biogeochemistry has not been…
(more)
▼ The causes and effects of recent global warming have been studied extensively; but, the role of atmospheric aerosols in the Arctic biogeochemistry has not been widely explored yet.
The water-soluble Arctic aerosols directly impact the climate by participating in cloud formation and influencing its radiative property. Moreover, the amplified Arctic warming may significantly influence the solubility and bio-availability of aerosol iron (Fe)—which is a limiting nutrient for phytoplankton growth, an important sink for atmospheric carbon dioxide (CO2).
This research investigates the chemical and physical processes on aerosols that were collected during the US Geotraces Arctic cruise in summer 2015 and natural snow samples from Newark, New Jersey in conjunction with laboratory experiments involving Fe minerals and organic ligands. We hypothesize that the Arctic aerosols were modified by various natural and anthropogenic processes, affecting the concentrations and hygroscopic properties of the cloud condensation nuclei and soluble Fe input to the Arctic Ocean.
Laboratory studies with hematite and major organic ligands showed that oxalate, when present above a threshold amount, had a significant effect on the absorptive dissolution of Fe. The results from the Arctic Ocean expedition showed that coarse mode sea-salt was the major aerosol component and non-sea-salt-sulfate was significantly present in fine mode aerosol particles. Among the organic species, oxalate, acetate, and formate were the major components among the species examined at the pole. Calcium was enriched on the sea-spray aerosols, pre-dominantly in the fine mode, leading to significant modification of the aerosol hygroscopic growth factor. Analysis of the natural snow and ice-melts showed that freezing could induce compaction and clustering of particles, but had negligible effect on modulating Fe solubility.
This study provides significant insight into the water soluble component of Arctic summer aerosols regarding their concentrations, sources, and possible formation mechanisms, and their effects on the Arctic climate via cloud formation. The laboratory based experiments increase our understanding of the effects of various processes occurring in Arctic aerosols—including the accumulation and reactions of organic components in aerosols and the freeze concentration effect on iron chemistry, which could affect the biogeochemical cycles in the Arctic Ocean.
Advisors/Committee Members: Gao, Yuan (chair), Reinfelder, John (internal member), Rouff, Ashaki (internal member), Khalizov, Alexei (outside member).
Subjects/Keywords: Atmospheric aerosols
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APA (6th Edition):
Mukherjee, Pami, 1. (2018). Investigation of chemical and physical processes on Arctic aerosols through a combined approach of field and laboratory studies. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/59332/
Chicago Manual of Style (16th Edition):
Mukherjee, Pami, 1986-. “Investigation of chemical and physical processes on Arctic aerosols through a combined approach of field and laboratory studies.” 2018. Doctoral Dissertation, Rutgers University. Accessed February 24, 2020.
https://rucore.libraries.rutgers.edu/rutgers-lib/59332/.
MLA Handbook (7th Edition):
Mukherjee, Pami, 1986-. “Investigation of chemical and physical processes on Arctic aerosols through a combined approach of field and laboratory studies.” 2018. Web. 24 Feb 2020.
Vancouver:
Mukherjee, Pami 1. Investigation of chemical and physical processes on Arctic aerosols through a combined approach of field and laboratory studies. [Internet] [Doctoral dissertation]. Rutgers University; 2018. [cited 2020 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/59332/.
Council of Science Editors:
Mukherjee, Pami 1. Investigation of chemical and physical processes on Arctic aerosols through a combined approach of field and laboratory studies. [Doctoral Dissertation]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/59332/
Rutgers University
12.
Tan, Yi, 1983-.
Secondary organic aerosol (SOA) formation from aqueous OH radical oxidation of dicarbonyl compounds in the atmosphere.
Degree: PhD, Environmental Sciences, 2010, Rutgers University
URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056804
► Secondary organic aerosols (SOA) affect visibility, health and global climate. Current chemical transport models cannot represent SOA in the free troposphere. Fog/cloud processing, which is…
(more)
▼ Secondary organic aerosols (SOA) affect visibility, health and global climate. Current chemical transport models cannot represent SOA in the free troposphere. Fog/cloud processing, which is the dominant source of atmospheric sulfate, has been recognized as a missing source of SOA globally. Aqueous photooxidation of water-soluble products (e.g., glyoxal and methylglyoxal) of gas-phase photochemistry yields low-volatility compounds including oxalic acid. When this chemistry takes place in clouds and fogs followed by droplet evaporation (or if this chemistry occurs in aerosol water) then products remain in part in the particle phase, forming SOA. However, current aqueous SOA formation mechanism has not shown how the starting concentrations of precursors and presence of acidic sulfate affect product formation. Aqueous phase photochemical batch reactions were conducted with glyoxal and methylglyoxal at cloud relevant concentrations, using hydrogen peroxide photolysis as the hydroxyl radical (∙OH) source. Experiments were repeated at higher concentrations and with/without sulfuric acid. Precursors and products were investigated using ion chromatography (IC), electrospray ionization mass spectrometry (ESI-MS), and IC-ESI-MS. Products included carboxylic acids and higher molecular weight compounds, which are major constituents of aerosols. Sulfuric acid shows little effect on product formation. Dilute aqueous chemistry models successfully reproduced product formation for glyoxal and methylglyoxal at cloud relevant conditions, but measurements deviated from predictions from predictions at elevated concentrations. Higher molecular weight products become increasingly important as precursor concentration increases. Aqueous radical-radical reactions provide explanations for observed higher molecular weight products. Additionally, acetic acid is identified as an SOA precursor for the first time. This work provides an improved understanding of aqueous phase dicarbonyl oxidation mechanism and the overall significance of aqueous SOA formation. Kinetic data are made available to regional and global atmospheric models, and the mechanism described in this work will help people to mitigate adverse aerosol effects.
Advisors/Committee Members: Tan, Yi, 1983- (author), Turpin, Barbara J. (chair), Reinfelder, John (internal member), Seitzinger, Sybil P. (internal member), Carlton, Ann Marie (outside member).
Subjects/Keywords: Aerosols – Health aspects; Atmospheric aerosols – Research
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APA ·
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APA (6th Edition):
Tan, Yi, 1. (2010). Secondary organic aerosol (SOA) formation from aqueous OH radical oxidation of dicarbonyl compounds in the atmosphere. (Doctoral Dissertation). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056804
Chicago Manual of Style (16th Edition):
Tan, Yi, 1983-. “Secondary organic aerosol (SOA) formation from aqueous OH radical oxidation of dicarbonyl compounds in the atmosphere.” 2010. Doctoral Dissertation, Rutgers University. Accessed February 24, 2020.
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056804.
MLA Handbook (7th Edition):
Tan, Yi, 1983-. “Secondary organic aerosol (SOA) formation from aqueous OH radical oxidation of dicarbonyl compounds in the atmosphere.” 2010. Web. 24 Feb 2020.
Vancouver:
Tan, Yi 1. Secondary organic aerosol (SOA) formation from aqueous OH radical oxidation of dicarbonyl compounds in the atmosphere. [Internet] [Doctoral dissertation]. Rutgers University; 2010. [cited 2020 Feb 24].
Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056804.
Council of Science Editors:
Tan, Yi 1. Secondary organic aerosol (SOA) formation from aqueous OH radical oxidation of dicarbonyl compounds in the atmosphere. [Doctoral Dissertation]. Rutgers University; 2010. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056804
Rutgers University
13.
Kravitz, Benjamin S., 1982-.
Stratospheric geoengineering with black carbon aerosols.
Degree: PhD, Atmospheric Science, 2011, Rutgers University
URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000061322
► I use a general circulation model of Earth's climate to simulate stratospheric geoengineering with black carbon aerosols, varying the altitude of injection, initial particle size,…
(more)
▼ I use a general circulation model of Earth's climate to simulate stratospheric geoengineering with black carbon aerosols, varying the altitude of injection, initial particle size, and whether the deposited black carbon modifies ground albedo. 1 Tg of black carbon aerosols injected into the stratosphere each year will cause significant enough surface cooling to negate anthropogenic warming if the aerosols are small (r=0.03 μm) or if the aerosols are injected into the middle stratosphere, although using small aerosols causes large regional cooling effects that would be catastrophic to agriculture. The aerosols cause significant stratospheric heating, resulting in stratospheric ozone destruction and circulation changes, most notably an increase in the Northern Hemisphere polar jet, which forms an Arctic ozone hole and forces a positive mode of the Arctic Oscillation. The hydrologic cycle is perturbed, specifically the summer monsoon system of India, Africa, and East Asia, resulting in monsoon precipitation collapse. Global primary productivity is decreased by 35.5% for the small particle case. Surface cooling causes some sea ice regrowth, but not at statistically significant levels. All of these climate impacts are exacerbated for small particle geoengineering, with high altitude geoengineering with the default particle size (r=0.08 μm) causing a reasonable amount of cooling, and large particle (r=0.15 μm) geoengineering or particle injection into the lower stratosphere causing few of these effects. The modification of ground albedo by the soot particles slightly perturbs the radiative budget but does not cause any distinguishable climate effects. The cheapest means we investigated for placing 1 Tg of black carbon aerosols into the stratosphere by diesel fuel combustion would cost 1.4 trillion initially and 541 billion annual, or 2.0% and 0.8% of GDP, respectively. The additional carbon dioxide released from combusting diesel to produce these aerosols is about 1% of current emissions, but the additional NOx would be 17% of current sources and could further reduce the total ozone column by up to 10%. Geoengineering with carbon black, if technically feasible, would be much cheaper, costing approximately 1 billion initially and 1.3 billion annually, with few troublesome emissions factors.
Advisors/Committee Members: Kravitz, Benjamin S., 1982- (author), Robock, Alan (chair), Miller, Mark (internal member), Broccoli, Anthony (internal member), Shindell, Drew T (outside member).
Subjects/Keywords: Environmental geotechnology; Aerosols – Environmental aspects; Stratospheric aerosols
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APA ·
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APA (6th Edition):
Kravitz, Benjamin S., 1. (2011). Stratospheric geoengineering with black carbon aerosols. (Doctoral Dissertation). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000061322
Chicago Manual of Style (16th Edition):
Kravitz, Benjamin S., 1982-. “Stratospheric geoengineering with black carbon aerosols.” 2011. Doctoral Dissertation, Rutgers University. Accessed February 24, 2020.
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000061322.
MLA Handbook (7th Edition):
Kravitz, Benjamin S., 1982-. “Stratospheric geoengineering with black carbon aerosols.” 2011. Web. 24 Feb 2020.
Vancouver:
Kravitz, Benjamin S. 1. Stratospheric geoengineering with black carbon aerosols. [Internet] [Doctoral dissertation]. Rutgers University; 2011. [cited 2020 Feb 24].
Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000061322.
Council of Science Editors:
Kravitz, Benjamin S. 1. Stratospheric geoengineering with black carbon aerosols. [Doctoral Dissertation]. Rutgers University; 2011. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000061322
14.
Lakshmi N B; Suresh Babu S.
Investigations of elevated aerosols over the Indian region and their radiative impacts.
Degree: 2019, Cochin University of Science and Technology
URL: http://dyuthi.cusat.ac.in/purl/5526
Subjects/Keywords: Aerosols; Elevated aerosols
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APA ·
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APA (6th Edition):
S, L. N. B. S. B. (2019). Investigations of elevated aerosols over the Indian region and their radiative impacts. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/5526
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
S, Lakshmi N B; Suresh Babu. “Investigations of elevated aerosols over the Indian region and their radiative impacts.” 2019. Thesis, Cochin University of Science and Technology. Accessed February 24, 2020.
http://dyuthi.cusat.ac.in/purl/5526.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
S, Lakshmi N B; Suresh Babu. “Investigations of elevated aerosols over the Indian region and their radiative impacts.” 2019. Web. 24 Feb 2020.
Vancouver:
S LNBSB. Investigations of elevated aerosols over the Indian region and their radiative impacts. [Internet] [Thesis]. Cochin University of Science and Technology; 2019. [cited 2020 Feb 24].
Available from: http://dyuthi.cusat.ac.in/purl/5526.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
S LNBSB. Investigations of elevated aerosols over the Indian region and their radiative impacts. [Thesis]. Cochin University of Science and Technology; 2019. Available from: http://dyuthi.cusat.ac.in/purl/5526
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
15.
Sachdeva, Kamna.
A study of carbonaceous aerosols in Delhi; -.
Degree: Environmental Sciences, 2008, Jawaharlal Nehru University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/29563
None
Appendices p.i-vii, Photo Gallery, Vitae, Figures
p.i-iv, Tables p.v-vi, Abbrevations vii-viii
Advisors/Committee Members: Attri, Arun K.Subjects/Keywords: Carbonaceous; aerosols; Delhi
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APA (6th Edition):
Sachdeva, K. (2008). A study of carbonaceous aerosols in Delhi; -. (Thesis). Jawaharlal Nehru University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/29563
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sachdeva, Kamna. “A study of carbonaceous aerosols in Delhi; -.” 2008. Thesis, Jawaharlal Nehru University. Accessed February 24, 2020.
http://shodhganga.inflibnet.ac.in/handle/10603/29563.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sachdeva, Kamna. “A study of carbonaceous aerosols in Delhi; -.” 2008. Web. 24 Feb 2020.
Vancouver:
Sachdeva K. A study of carbonaceous aerosols in Delhi; -. [Internet] [Thesis]. Jawaharlal Nehru University; 2008. [cited 2020 Feb 24].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/29563.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sachdeva K. A study of carbonaceous aerosols in Delhi; -. [Thesis]. Jawaharlal Nehru University; 2008. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/29563
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
16.
Tamiru, Bayissa.
RADON PROGENY DEPOSITION IN RESPIRATORY TRACT: COMPARATIVE ANALYSIS OF MODELS
.
Degree: 2012, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/1187
► Cheng (2003) model of the extra-thoracic respiratory tract was used to calculate the deposition efficiency of aerosols of aerodynamic diameter ranging from 0.1 m to…
(more)
▼ Cheng (2003) model of the extra-thoracic respiratory tract was used to calculate
the deposition efficiency of
aerosols of aerodynamic diameter ranging from 0.1 m
to 72 m. The model assumes the deposition in the extra-thoracic region is mainly
due to nasal airway geometry and the critical dimension is the minimum crosssectional
area in the nasal passage. A dimensionless Stokes number is calculated
as a function of the the aerodynamic diameter (da), flow rate (Q), and the minimum
cross-sectional area (Amin). Literature value of Amin = 1:61 cm2 was used in the
calculation of Stockes number.
The calculation done using this model agrees with the predictions of the ICRP
1994 respiratory tract model. Further this model gives good agreement to the
experimental results available in literature by introducing adjusting parameters
for breathing rate and specific geometries of individuals.
Advisors/Committee Members: Dr. Tilahun Tesfaye (advisor).
Subjects/Keywords: aerosols;
aerodynamic diameter
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APA (6th Edition):
Tamiru, B. (2012). RADON PROGENY DEPOSITION IN RESPIRATORY TRACT: COMPARATIVE ANALYSIS OF MODELS
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/1187
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tamiru, Bayissa. “RADON PROGENY DEPOSITION IN RESPIRATORY TRACT: COMPARATIVE ANALYSIS OF MODELS
.” 2012. Thesis, Addis Ababa University. Accessed February 24, 2020.
http://etd.aau.edu.et/dspace/handle/123456789/1187.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tamiru, Bayissa. “RADON PROGENY DEPOSITION IN RESPIRATORY TRACT: COMPARATIVE ANALYSIS OF MODELS
.” 2012. Web. 24 Feb 2020.
Vancouver:
Tamiru B. RADON PROGENY DEPOSITION IN RESPIRATORY TRACT: COMPARATIVE ANALYSIS OF MODELS
. [Internet] [Thesis]. Addis Ababa University; 2012. [cited 2020 Feb 24].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/1187.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tamiru B. RADON PROGENY DEPOSITION IN RESPIRATORY TRACT: COMPARATIVE ANALYSIS OF MODELS
. [Thesis]. Addis Ababa University; 2012. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1187
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
17.
Hallal, Taleb Ali.
Size – resolved properties of atmospheric aerosols in Sydney and regional NSW.
Degree: Physics, 2010, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/50093
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9025/SOURCE02?view=true
► In recent years it has become evident that the size resolved chemistry of atmospheric aerosols is important in determining their optical properties which in turn…
(more)
▼ In recent years it has become evident that the size resolved chemistry of atmospheric
aerosols is important in determining their optical properties which in turn determine the way radiation is transmitted through the atmosphere. In this study the seasonal and spatial variations of aerosol chemical and optical properties of Sydney and regional NSW
aerosols are investigated. PM2.5 and PM10 samples were collected from four sites during each season of 2003 using Ecotech MicroVol samplers. These samples were analyzed at ANSTO using Ion Beam Analysis to determine their elemental composition. The elemental composition was used to identify seasonal sources at each site using two approaches: composite variables / pseudo elements and Principal Components Analysis. There were seasonal, spatial and size-related variations within sites and between sites and good agreement between the approaches.The elemental composition was then used as input to the thermodynamic equilibrium model, SCAPE2, to predict the inorganic chemical composition of each aerosol sample for the conditions at the time of sampling. Two methods were used to determine seasonal average chemistry: SCAPE2 output for individual days was averaged; and seasonally averaged elemental composition was used as input to the program. The two methods gave similar results. Some seasonal variations in composition were identified, with the largest differences occurring between the urban sites and the rural sites.The chemical composition determined using SCAPE2 plus the other chemical components was used to estimate the refractive index and density at the time of sampling for each site using both molar refraction and mass fraction approaches. The real part of the refractive index was 1.45 – 1.47 ± 0.06 for PM2.5 and 1.45±0.08 for PM10, but strong seasonal and site variations were found for the imaginary part with yearly average of 0.11 – 0.18 ± 0.15 for PM2.5 and 0.06 ± 0.07 – 0.13 ± 0.12 for PM10. The hygroscopic behaviour of refractive index and density was also investigated. Scanning Electron Microscopy was used to determine particle size information for selected samples. This, along with refractive index for those days was used in Mie calculation of the scattering coefficient. The calculated values agreed, within the uncertainties, with nephelometer readings made on those days.
Advisors/Committee Members: Box, Gail, Physics, Faculty of Science, UNSW.
Subjects/Keywords: Atmospheric aerosols; Radiation
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APA ·
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Manager
APA (6th Edition):
Hallal, T. A. (2010). Size – resolved properties of atmospheric aerosols in Sydney and regional NSW. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/50093 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9025/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Hallal, Taleb Ali. “Size – resolved properties of atmospheric aerosols in Sydney and regional NSW.” 2010. Doctoral Dissertation, University of New South Wales. Accessed February 24, 2020.
http://handle.unsw.edu.au/1959.4/50093 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9025/SOURCE02?view=true.
MLA Handbook (7th Edition):
Hallal, Taleb Ali. “Size – resolved properties of atmospheric aerosols in Sydney and regional NSW.” 2010. Web. 24 Feb 2020.
Vancouver:
Hallal TA. Size – resolved properties of atmospheric aerosols in Sydney and regional NSW. [Internet] [Doctoral dissertation]. University of New South Wales; 2010. [cited 2020 Feb 24].
Available from: http://handle.unsw.edu.au/1959.4/50093 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9025/SOURCE02?view=true.
Council of Science Editors:
Hallal TA. Size – resolved properties of atmospheric aerosols in Sydney and regional NSW. [Doctoral Dissertation]. University of New South Wales; 2010. Available from: http://handle.unsw.edu.au/1959.4/50093 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9025/SOURCE02?view=true
Rutgers University
18.
Zhen, Huajun, 1985-.
Investigation of bioaerosol characterization bias due to aerosolization and sampling.
Degree: PhD, Environmental Sciences, 2015, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/47620/
► Bioaerosols have been investigated for their adverse effects on human health and also their roles in cloud formation, precipitation and atmospheric chemical reactions. In these…
(more)
▼ Bioaerosols have been investigated for their adverse effects on human health and also their roles in cloud formation, precipitation and atmospheric chemical reactions. In these studies, it is often necessary to collect biological cells from the airborne state or to disperse the cells into the air using a variety of sampling and aerosolization devices. These devices inevitably exert stress on the cells and result in changes in their biological characteristics, e.g. loss of culturability, impairment of cell membrane, and change in cellular activities. It is highly likely that after experiencing such stress, collected microorganisms are not representative of cells prior to sampling and aerosolization, and thus could introduce biases in their characterization. In this dissertation, the potential bioaerosol characterization biases induced by several commonly used sampling and aerosolization devices were investigated. The stress experienced by E. coli during aerosolization was found to depend on a particular aerosolization device. Particularly, a newly developed pneumatic nebulizer, the Single-Pass Aerosolizer, was shown to better preserve cell culturability and membrane integrity compared to the commonly used Collison nebulizer at similar biological particles output concentrations. Several bioaerosol samplers that employ filtration, impingement, impaction and electrostatic precipitation for sample collection were tested with respect to their effects on the cell membrane integrity and cellular 16S rRNA content of Escherichia coli cells. Sampling stress resulted in severe membrane impairment to E. coli aerosols, leading to the release of genomic DNA as extracellular molecules. Extracellular DNA should be taken into account when analyzing bioaerosol samples to more accurately quantify bacterial presence. Cell membrane damage to bioaerosols depended on which sampler was used and could be reduced by modifying specific operational parameters. E. coli cells exhibited variation in 16S ribosomal RNA (rRNA) level when exposed to long-term air sampling in laboratory experiment, suggesting a change of biological activity in response to sampling stress. The importance of this effect for those taxa in airborne bacterial community from a variety of environments should be examined. The abundance of bacterial 16S rRNA in bioaerosols collected from an outdoor environment was about two orders of magnitude higher than that of 16S rRNA gene. However, the sampler-dependent bias effect on analysis of 16S rRNA sequences for bacterial community composition was minimal in investigated outdoor bioaerosols.
Advisors/Committee Members: Mainelis, Gediminas (chair), Fennell, Donna E (internal member), Reinfelder, John (internal member), SCHWANDER, STEPHAN (outside member).
Subjects/Keywords: Biosensors; Aerosols – Measurement
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Manager
APA (6th Edition):
Zhen, Huajun, 1. (2015). Investigation of bioaerosol characterization bias due to aerosolization and sampling. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/47620/
Chicago Manual of Style (16th Edition):
Zhen, Huajun, 1985-. “Investigation of bioaerosol characterization bias due to aerosolization and sampling.” 2015. Doctoral Dissertation, Rutgers University. Accessed February 24, 2020.
https://rucore.libraries.rutgers.edu/rutgers-lib/47620/.
MLA Handbook (7th Edition):
Zhen, Huajun, 1985-. “Investigation of bioaerosol characterization bias due to aerosolization and sampling.” 2015. Web. 24 Feb 2020.
Vancouver:
Zhen, Huajun 1. Investigation of bioaerosol characterization bias due to aerosolization and sampling. [Internet] [Doctoral dissertation]. Rutgers University; 2015. [cited 2020 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47620/.
Council of Science Editors:
Zhen, Huajun 1. Investigation of bioaerosol characterization bias due to aerosolization and sampling. [Doctoral Dissertation]. Rutgers University; 2015. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47620/
Rutgers University
19.
Ramos-Busot, Anjuli, 1987-.
Formation of organic aerosol through cloud chemistry: insights from the OH radical oxidation of filtered rainwater.
Degree: MS, Environmental Sciences, 2012, Rutgers University
URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000064165
► Organic particulate matter in the atmosphere plays an important role in climate forcing, visibility, and adverse health effects. Atmospheric organic aerosol is predominantly of secondary…
(more)
▼ Organic particulate matter in the atmosphere plays an important role in climate forcing, visibility, and adverse health effects. Atmospheric organic aerosol is predominantly of secondary origin, formed in the atmosphere. Laboratory photooxidation experiments, atmospheric aerosol measurements below vs. above clouds and at increasing humidity, and modeling studies all suggest that secondary organic aerosol (SOA) forms from water-soluble gases through aqueous chemistry in clouds and wet
aerosols (aqSOA). Previous laboratory experiments are simple compared to the atmospheric water media (single compound deionize water solutions), thus a more realistic approach is needed for the understanding of SOA formation through aqueous chemistry. We conducted batch photooxidation experiments with three different rainwater samples from Camden and Pinelands, NJ and hydroxyl radicals (formed from 150 μM H2O2 + UV radiation). We used rainwater (RW) as a surrogate for cloud water in these experiments. SOA precursors and products were identified by real-time Electrospray Ionization – Mass Spectrometry (ESI-MS, continuous online sampling) and by Ion Chromatography (discrete samples). Precursors were found predominantly in the positive mode, suggesting the presence of aldehydes, alcohols and organic peroxides, and products were found predominantly in the negative mode, suggesting the presence of organic acids. A decrease in the abundance of ions with the same unit mass-to-charge ratio as standards of glyoxal, methylglyoxal and glycolaldehyde and an increase in the abundance of ions associated with organic acids (e.g., oxalic and pyruvic acid) suggest that these aldehydes were present and reacting. The evidence is strongest for methylglyoxal (three RW samples). Glyoxal oxidation appears to occur in two RW samples; evidence for glycolaldehyde is not as strong. Other potential contributors to SOA formation (precursor and products) were identified based on their percentage of change and absolute change in ion abundance across the reaction.
Advisors/Committee Members: Ramos-Busot, Anjuli, 1987- (author), Turpin, Barbara (chair), Carlton, Annmarie (internal member), Reinfelder, John (internal member).
Subjects/Keywords: Atmospheric aerosols – Research
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APA (6th Edition):
Ramos-Busot, Anjuli, 1. (2012). Formation of organic aerosol through cloud chemistry: insights from the OH radical oxidation of filtered rainwater. (Masters Thesis). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000064165
Chicago Manual of Style (16th Edition):
Ramos-Busot, Anjuli, 1987-. “Formation of organic aerosol through cloud chemistry: insights from the OH radical oxidation of filtered rainwater.” 2012. Masters Thesis, Rutgers University. Accessed February 24, 2020.
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000064165.
MLA Handbook (7th Edition):
Ramos-Busot, Anjuli, 1987-. “Formation of organic aerosol through cloud chemistry: insights from the OH radical oxidation of filtered rainwater.” 2012. Web. 24 Feb 2020.
Vancouver:
Ramos-Busot, Anjuli 1. Formation of organic aerosol through cloud chemistry: insights from the OH radical oxidation of filtered rainwater. [Internet] [Masters thesis]. Rutgers University; 2012. [cited 2020 Feb 24].
Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000064165.
Council of Science Editors:
Ramos-Busot, Anjuli 1. Formation of organic aerosol through cloud chemistry: insights from the OH radical oxidation of filtered rainwater. [Masters Thesis]. Rutgers University; 2012. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000064165
Colorado State University
20.
Nelson, Robert R.
Impact of aerosols on space-based retrievals of carbon dioxide, The.
Degree: MS(M.S.), Atmospheric Science, 2015, Colorado State University
URL: http://hdl.handle.net/10217/166883
► This work describes an investigation into the impact of aerosols on space-based retrievals of the column-averaged dry-air mole fraction of carbon dioxide (XCO2). It was…
(more)
▼ This work describes an investigation into the impact of
aerosols on space-based retrievals of the column-averaged dry-air mole fraction of carbon dioxide (XCO2). It was initially hypothesized that a simplified non-scattering, or "clear sky", retrieval, which neglects scattering and absorption by clouds and
aerosols, could potentially avoid errors and biases brought about by attempting to measure properties of clouds and
aerosols when there are none present. Clear sky retrievals have the benefit of being orders of magnitude faster and potentially as accurate as "full physics" retrievals that attempt to gain information about clouds and
aerosols. Real data from the Greenhouse Gases Observing Satellite (GOSAT) and simulated data from the Orbiting Carbon Observatory-2 (OCO-2) were analyzed to find conditions under which a clear sky retrieval might perform as well as a full physics retrieval. It was found that for real GOSAT data the clear sky retrieval performed relatively well over land but not as well over ocean. The opposite conclusion was found for simulated OCO-2 data: it performed well over ocean but poorly over land. For both real GOSAT data and simulated OCO-2 data, high levels of filtering were needed for the clear sky retrieval to be able to perform nearly as well as or better than the full physics retrieval for both land and ocean surfaces. Spectral residuals were then examined to determine if the clear sky algorithm's performance was tied to errors in the spectral fitting. It was found that the clear sky retrievals had larger residuals than the full physics retrievals but that reducing the clear sky residuals by allowing them to fit for a customized residual pattern did little to reduce the XCO2 errors. It was also shown that even very clear scenes can result in small but detectable clear sky residual patterns. A comparison of cloud and aerosol properties measured by the XCO2 retrieval algorithm to aerosol optical depths from the AErosol RObotic NETwork (AERONET) revealed that the algorithm is generally unable to accurately retrieve information about the amount of clouds and
aerosols present. Using OCO-2 simulations, it was shown that the algorithm is also only somewhat able to retrieve the heights of the aerosol layers. Information retrieved about individual aerosol types was shown to be even less accurate. Finally, early work in this study prompted investigation into how sensitive the XCO2 retrieval algorithm is to the first guess of aerosol properties. χ² space was explored by varying the first guess of various aerosol parameters. It was revealed that the retrieved aerosol information and XCO2 values can be highly sensitive to the first guess of the state vector, indicating significant nonlinearity in the retrieval's forward model. Two main conclusions were derived from this work. The first is that an analysis of real GOSAT clear sky XCO2 retrievals and simulated OCO-2 clear sky XCO2 retrievals revealed that the clear sky algorithm is generally inferior to the full physics algorithm, except for…
Advisors/Committee Members: O'Dell, Christopher W. (advisor), Denning, A. Scott (committee member), Kummerow, Christian D. (committee member), Lefsky, Michael A. (committee member).
Subjects/Keywords: carbon dioxide; aerosols
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APA (6th Edition):
Nelson, R. R. (2015). Impact of aerosols on space-based retrievals of carbon dioxide, The. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/166883
Chicago Manual of Style (16th Edition):
Nelson, Robert R. “Impact of aerosols on space-based retrievals of carbon dioxide, The.” 2015. Masters Thesis, Colorado State University. Accessed February 24, 2020.
http://hdl.handle.net/10217/166883.
MLA Handbook (7th Edition):
Nelson, Robert R. “Impact of aerosols on space-based retrievals of carbon dioxide, The.” 2015. Web. 24 Feb 2020.
Vancouver:
Nelson RR. Impact of aerosols on space-based retrievals of carbon dioxide, The. [Internet] [Masters thesis]. Colorado State University; 2015. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/10217/166883.
Council of Science Editors:
Nelson RR. Impact of aerosols on space-based retrievals of carbon dioxide, The. [Masters Thesis]. Colorado State University; 2015. Available from: http://hdl.handle.net/10217/166883
The Ohio State University
21.
Chen, Sun-I.
Determination of the collection efficiencies of aerosol
particles by continuously moving solid cylinders.
Degree: PhD, Graduate School, 1975, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486992459687293
Subjects/Keywords: Engineering; Aerosols
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APA (6th Edition):
Chen, S. (1975). Determination of the collection efficiencies of aerosol
particles by continuously moving solid cylinders. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486992459687293
Chicago Manual of Style (16th Edition):
Chen, Sun-I. “Determination of the collection efficiencies of aerosol
particles by continuously moving solid cylinders.” 1975. Doctoral Dissertation, The Ohio State University. Accessed February 24, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1486992459687293.
MLA Handbook (7th Edition):
Chen, Sun-I. “Determination of the collection efficiencies of aerosol
particles by continuously moving solid cylinders.” 1975. Web. 24 Feb 2020.
Vancouver:
Chen S. Determination of the collection efficiencies of aerosol
particles by continuously moving solid cylinders. [Internet] [Doctoral dissertation]. The Ohio State University; 1975. [cited 2020 Feb 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486992459687293.
Council of Science Editors:
Chen S. Determination of the collection efficiencies of aerosol
particles by continuously moving solid cylinders. [Doctoral Dissertation]. The Ohio State University; 1975. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486992459687293
The Ohio State University
22.
Marshall, Charles Gridley.
Deposition of aerosol particles on screens.
Degree: PhD, Graduate School, 1956, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1485795295567815
Subjects/Keywords: Engineering; Aerosols
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APA (6th Edition):
Marshall, C. G. (1956). Deposition of aerosol particles on screens. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1485795295567815
Chicago Manual of Style (16th Edition):
Marshall, Charles Gridley. “Deposition of aerosol particles on screens.” 1956. Doctoral Dissertation, The Ohio State University. Accessed February 24, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1485795295567815.
MLA Handbook (7th Edition):
Marshall, Charles Gridley. “Deposition of aerosol particles on screens.” 1956. Web. 24 Feb 2020.
Vancouver:
Marshall CG. Deposition of aerosol particles on screens. [Internet] [Doctoral dissertation]. The Ohio State University; 1956. [cited 2020 Feb 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1485795295567815.
Council of Science Editors:
Marshall CG. Deposition of aerosol particles on screens. [Doctoral Dissertation]. The Ohio State University; 1956. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1485795295567815
The Ohio State University
23.
Thomas, D. G.
Deposition of aerosol particles in fibrous packing.
Degree: PhD, Graduate School, 1953, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486467544554745
Subjects/Keywords: Engineering; Aerosols
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APA (6th Edition):
Thomas, D. G. (1953). Deposition of aerosol particles in fibrous packing. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486467544554745
Chicago Manual of Style (16th Edition):
Thomas, D G. “Deposition of aerosol particles in fibrous packing.” 1953. Doctoral Dissertation, The Ohio State University. Accessed February 24, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1486467544554745.
MLA Handbook (7th Edition):
Thomas, D G. “Deposition of aerosol particles in fibrous packing.” 1953. Web. 24 Feb 2020.
Vancouver:
Thomas DG. Deposition of aerosol particles in fibrous packing. [Internet] [Doctoral dissertation]. The Ohio State University; 1953. [cited 2020 Feb 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486467544554745.
Council of Science Editors:
Thomas DG. Deposition of aerosol particles in fibrous packing. [Doctoral Dissertation]. The Ohio State University; 1953. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486467544554745
Dalhousie University
24.
Croft, Betty.
Aerosol Wet Scavenging and Cloud Processing of Aerosols in a
Global Climate Model.
Degree: PhD, Department of Physics & Atmospheric
Science, 2011, Dalhousie University
URL: http://hdl.handle.net/10222/13241
► Clouds strongly influence three-dimensional aerosol distributions by 1) wet scavenging and subsequent deposition to the earth's surface, and 2) processing and subsequent release to the…
(more)
▼ Clouds strongly influence three-dimensional aerosol
distributions by 1) wet scavenging and subsequent deposition to the
earth's surface, and 2) processing and subsequent release to the
atmosphere by evaporation processes. In this study, physically
detailed size-dependent representations of below-cloud and in-cloud
scavenging for mixed phase clouds are introduced into the
ECHAM5-HAM global climate model. As well, a stratiform cloud
aerosol processing scheme is extended to convective clouds.
Below-cloud impaction scavenging is found to contribute strongly to
the global and annual mean mass deposition for sulfate (14%), black
carbon (13%), particulate organic matter (10%), sea salt (23%), and
dust (24%). The modeled global mean aerosol optical depth, and sea
salt burden are reduced by about 15% for the more vigorous
size-dependent parameterization of below-cloud scavenging by rain
and snow. In stratiform clouds, aerosol mass is found to be
primarily (>90%) scavenged by cloud nucleation processes for all
aerosol species, except for dust (50%). Uncertainties in the
representation of in-cloud scavenging processes change the
predicted annual, global mean aerosol mass burdens by 20 to 30%,
and change the predicted aerosol mass concentrations by up to one
order of magnitude in the middle troposphere where mixed phase
clouds exist. Closer agreement with observations of black carbon
profiles from aircraft is found for the new in-cloud scavenging
scheme. Convective and stratiform clouds contribute about equally
to the global, annual mean aerosol processing, but wet deposition
is primarily attributed to stratiform clouds (75%). Sulfate and
carbonaceous
aerosols undergo 1-3 cloud cycles before deposition.
Aerosol burdens and optical depth (AOD) increase by a factor of 3-5
with the explicit representation of cloud/precipitation
evaporation. Revised sea salt emissions and more vigorous in-cloud
impaction scavenging reduce the AOD by a factor of three to give
closer agreement with satellite retrievals. Observed marine
boundary layer accumulation mode size distributions, and vertically
integrated aerosol size distributions from AERONET observations are
more closely approximated with the aerosol processing scheme than
for the standard ECHAM5-HAM.
Advisors/Committee Members: Dr. Peter Adams (external-examiner), Dr. Ted Monchesky (graduate-coordinator), Dr. Ian Folkins (thesis-reader), Dr. Glen Lesins (thesis-reader), Dr. Ulrike Lohmann and Dr. Randall Martin (thesis-supervisor), Not Applicable (ethics-approval), Yes (manuscripts), Yes (copyright-release).
Subjects/Keywords: Aerosols; climate; wet scavenging
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APA (6th Edition):
Croft, B. (2011). Aerosol Wet Scavenging and Cloud Processing of Aerosols in a
Global Climate Model. (Doctoral Dissertation). Dalhousie University. Retrieved from http://hdl.handle.net/10222/13241
Chicago Manual of Style (16th Edition):
Croft, Betty. “Aerosol Wet Scavenging and Cloud Processing of Aerosols in a
Global Climate Model.” 2011. Doctoral Dissertation, Dalhousie University. Accessed February 24, 2020.
http://hdl.handle.net/10222/13241.
MLA Handbook (7th Edition):
Croft, Betty. “Aerosol Wet Scavenging and Cloud Processing of Aerosols in a
Global Climate Model.” 2011. Web. 24 Feb 2020.
Vancouver:
Croft B. Aerosol Wet Scavenging and Cloud Processing of Aerosols in a
Global Climate Model. [Internet] [Doctoral dissertation]. Dalhousie University; 2011. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/10222/13241.
Council of Science Editors:
Croft B. Aerosol Wet Scavenging and Cloud Processing of Aerosols in a
Global Climate Model. [Doctoral Dissertation]. Dalhousie University; 2011. Available from: http://hdl.handle.net/10222/13241
University of Alberta
25.
Martinez, Roberto Carlos.
Study of Enhanced Deposition due to Magnetic Field Alignment
of Ellipsoid Particles Using Direct Numerical Simulations.
Degree: MS, Department of Mechanical Engineering, 2012, University of Alberta
URL: https://era.library.ualberta.ca/files/vx021g61s
► A recent in vitro study demonstrated a non invasive method to enhance local deposition in a small airway by controlling the angular position of magnetic…
(more)
▼ A recent in vitro study demonstrated a non invasive
method to enhance local deposition in a small airway by controlling
the angular position of magnetic high aspect ratio particles. This
technique could mitigate the challenge of providing sufficient
therapeutic effects when using aerosolized chemotherapy techniques.
To highlight the potential of this new magnetic field alignment
approach the effect of increasing particle aspect ratio on the
deposition efficiency was studied using direct numerical
simulations. Simulations were done using an in house finite element
algorithm. A steady air flow, typical of tidal breathing, was
simulated through a three dimensional physiologically realistic
bifurcation representing a single symmetrical bifurcation between
generations 14 and 15 in the lung. For two different aspect ratios
the deposition efficiency was found for the case of an
unconstrained particle and magnetically aligned particle. Results
indicate that forcing local alignment of high aspect ratio
particles can increase local deposition considerably.
Subjects/Keywords: Aerosols; Numerical Method; Deposition; Targeting
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APA (6th Edition):
Martinez, R. C. (2012). Study of Enhanced Deposition due to Magnetic Field Alignment
of Ellipsoid Particles Using Direct Numerical Simulations. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/vx021g61s
Chicago Manual of Style (16th Edition):
Martinez, Roberto Carlos. “Study of Enhanced Deposition due to Magnetic Field Alignment
of Ellipsoid Particles Using Direct Numerical Simulations.” 2012. Masters Thesis, University of Alberta. Accessed February 24, 2020.
https://era.library.ualberta.ca/files/vx021g61s.
MLA Handbook (7th Edition):
Martinez, Roberto Carlos. “Study of Enhanced Deposition due to Magnetic Field Alignment
of Ellipsoid Particles Using Direct Numerical Simulations.” 2012. Web. 24 Feb 2020.
Vancouver:
Martinez RC. Study of Enhanced Deposition due to Magnetic Field Alignment
of Ellipsoid Particles Using Direct Numerical Simulations. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2020 Feb 24].
Available from: https://era.library.ualberta.ca/files/vx021g61s.
Council of Science Editors:
Martinez RC. Study of Enhanced Deposition due to Magnetic Field Alignment
of Ellipsoid Particles Using Direct Numerical Simulations. [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/vx021g61s
Oregon State University
26.
Ko, Lih-jong.
Factors influencing the atmospheric aerosol composition at two sites in western Oregon.
Degree: MS, Atmospheric Sciences, 1992, Oregon State University
URL: http://hdl.handle.net/1957/28977
► Fine and coarse particles were collected for eight weeks during the summer of 1991, at a coastal site (Yaquina Head) and a non-industrial site (Corvallis)…
(more)
▼ Fine and coarse particles were collected for eight weeks during the
summer of 1991, at a coastal site (Yaquina Head) and a non-industrial site
(Corvallis) in Western Oregon to characterize the aerosol composition and
evaluate whether the sites are appropriate for sampling "background" marine
air. Concentrations of up to 11 species (S0₄²⁻, NO₃⁻, Cl⁻, Na, Fe, Ni, Pb, Cr, Co,
Sb, and CH₃SO₃H) for 95 samples were determined using four chemical
analysis techniques.
The influences of seasalt and soil dust were identified by analyzing
concentrations of Na and Fe in the aerosol samples. Relative elemental
composition in fine and coarse fractions indicated that the aerosol
composition at Yaquina Head was greatly affected by seasalt. "Seasalt"
enrichment factors (relative to Na) indicated that seasalt is the only source of
Cl⁻ and SO₄²⁻ in coarse particles at Yaquina Head. In contrast, the seasalt
influence was relatively weak at the Corvallis site. "Crustal" enrichment
factors suggested that soil dust was not a major source of Na⁺, Cl⁻, or S0₄²⁻ at
either site.
A simple conceptual model that relies on meteorological conditions was
used to identify sampling periods with long range transport from either
marine or continental areas as well as local influences. This model suggested
that during 61% of the experiment period the
aerosols were advected from
marine areas. At Yaquina Head, 52% of the sampling periods are associated
with the "clean" background air (marine air with no local influences). Thus,
Yaquina Head represents a useful location for collecting marine background
air from the Pacific Ocean. The chemical composition of the marine
background air collected at the Yaquina Head site is similar to that for other
remote sites around the world. At Corvallis, "clean" marine background air
can occasionally (21%) be collected even though Corvallis is located 64 km
from the ocean.
Advisors/Committee Members: Vong, Richard J. (advisor), Schuyler, Michael W. (committee member).
Subjects/Keywords: Aerosols – Analysis
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APA (6th Edition):
Ko, L. (1992). Factors influencing the atmospheric aerosol composition at two sites in western Oregon. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/28977
Chicago Manual of Style (16th Edition):
Ko, Lih-jong. “Factors influencing the atmospheric aerosol composition at two sites in western Oregon.” 1992. Masters Thesis, Oregon State University. Accessed February 24, 2020.
http://hdl.handle.net/1957/28977.
MLA Handbook (7th Edition):
Ko, Lih-jong. “Factors influencing the atmospheric aerosol composition at two sites in western Oregon.” 1992. Web. 24 Feb 2020.
Vancouver:
Ko L. Factors influencing the atmospheric aerosol composition at two sites in western Oregon. [Internet] [Masters thesis]. Oregon State University; 1992. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/1957/28977.
Council of Science Editors:
Ko L. Factors influencing the atmospheric aerosol composition at two sites in western Oregon. [Masters Thesis]. Oregon State University; 1992. Available from: http://hdl.handle.net/1957/28977
Oregon State University
27.
Walsh, Christopher D.
A complex signal to noise problem : determining the aerosol indirect effect from observations of ship tracks in AVHRR data.
Degree: MS, Atmospheric Sciences, 2002, Oregon State University
URL: http://hdl.handle.net/1957/28779
► Cloud reflectivity is a function of cloud liquid water content and droplet number concentration. Since cloud droplets form around pre-existing aerosol particles, cloud droplet number…
(more)
▼ Cloud reflectivity is a function of cloud liquid water content and droplet
number concentration. Since cloud droplets form around pre-existing aerosol
particles, cloud droplet number concentration depends on the availability of
particles that can serve as cloud condensation nuclei. Given constant liquid
water amount, increased availability of cloud condensation nuclei leads to
clouds with a greater droplet number concentration, greater total droplet
surface area and consequently, greater reflectivity. The change in cloud
reflectivity resulting from the increased availability of condensation nuclei is
known as the aerosol indirect effect. The aerosol indirect effect ranks as one
of the largest sources of uncertainty in current estimates of global climate
change, largely due to difficulties in measurement. Changes in cloud
reflectivity resulting from the aerosol indirect effect are typically much
smaller than the natural background variability observed in clouds. As a
result, the modification signal is very difficult to detect against the
background noise. Additionally, since atmospheric
aerosols are ubiquitous, it
is difficult to find polluted and nonpolluted clouds that are sufficiently alike
for reasonable comparison. However, ship tracks seen in satellite images
present one opportunity to study the aerosol indirect effect in relative
isolation. Ship tracks are regions of enhanced reflectivity in marine stratus,
resulting from the addition of
aerosols from ship exhaust plumes to
preexisting clouds. Ship tracks are a common feature of satellite images of
the North Pacific. Since the marine atmosphere has comparatively low
background aerosol concentrations, the addition of ship exhaust particles can
lead to distinct increases in cloud reflectivity. Ship tracks allow for sampling
of polluted and nonpolluted clouds from adjacent regions with similar solar
and viewing geometry, cloud temperatures and surface properties, and
consequently provide a unique opportunity to study the effects of aerosol
modification of cloud reflectivity. Using satellite images of the North Pacific
in July 1999, over 1000 ship tracks were identified, logged and analyzed,
yielding 504 sets of radiance data matching polluted clouds with nearby
nonpolluted clouds. It was expected that increasing the size of the region for
selection of nonpolluted clouds would increase the variability in observed
reflectivity, and make detection of the modification signal more difficult. In
order to study this potential effect of domain size for selection of nonpolluted
clouds on measurements of the aerosol indirect effect, three data sets were
collected, using domain sizes for selection of nonpolluted clouds of 15, 50
and 100 km. Analysis of retrieved optical depth and droplet effective radius
for modified and control pixels shows evidence of a 1-5% increase in visible
optical depth of marine stratus following modification by addition of ship
exhaust particles, but unexpectedly, shows only slight increases in uncertainty
…
Advisors/Committee Members: Coakley, James A. Jr (advisor).
Subjects/Keywords: Atmospheric aerosols
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APA (6th Edition):
Walsh, C. D. (2002). A complex signal to noise problem : determining the aerosol indirect effect from observations of ship tracks in AVHRR data. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/28779
Chicago Manual of Style (16th Edition):
Walsh, Christopher D. “A complex signal to noise problem : determining the aerosol indirect effect from observations of ship tracks in AVHRR data.” 2002. Masters Thesis, Oregon State University. Accessed February 24, 2020.
http://hdl.handle.net/1957/28779.
MLA Handbook (7th Edition):
Walsh, Christopher D. “A complex signal to noise problem : determining the aerosol indirect effect from observations of ship tracks in AVHRR data.” 2002. Web. 24 Feb 2020.
Vancouver:
Walsh CD. A complex signal to noise problem : determining the aerosol indirect effect from observations of ship tracks in AVHRR data. [Internet] [Masters thesis]. Oregon State University; 2002. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/1957/28779.
Council of Science Editors:
Walsh CD. A complex signal to noise problem : determining the aerosol indirect effect from observations of ship tracks in AVHRR data. [Masters Thesis]. Oregon State University; 2002. Available from: http://hdl.handle.net/1957/28779
University of Hong Kong
28.
侯璐; Hou, Lu.
Droplet size distribution of electronic cigarette
aerosols.
Degree: Master of Medical Sciences, 2016, University of Hong Kong
URL: http://hdl.handle.net/10722/249840
► Electronic cigarettes (EC), also called e-cigarettes, resemble tobacco cigarettes and produce aerosol by heating and vaporizing the e-liquid with or without nicotine. Now they are…
(more)
▼ Electronic cigarettes (EC), also called
e-cigarettes, resemble tobacco cigarettes and produce aerosol by
heating and vaporizing the e-liquid with or without nicotine. Now
they are marketed as general consumer products rather than
regulated as medical or pharmaceutical products. However, like
conventional pharmaceutical inhalation devices such as nebulizers,
ECs could produce aerosols into the respiratory tract by oral
inhalation. Also, ECs are portable and flexible to be
pharmaceutical inhalers. These deserve more concern whether ECs
could be used technically for drug pulmonary delivery. This study
collected the comprehensive information of ECs, including EC
development, EC design and its components, main chemical ingredient
in e-liquid and their relative toxicity, generated aerosol, EC
performance, EC safety and the relative regulations in countries.
This study was designed to investigate ECs from the viewpoint of
inhalation development for drug, comparing with a jet nebulizer. In
this study, the droplet sizes were measured by the laser
diffractometer as aerodynamic size by volume. The cumulative
distribution (Q3), the droplet size distribution, the intercepted
droplet diameter at 10% (D10), 50% (D50), and 90% (D90) of
cumulative percentage of different samples were measured in ECs and
nebulizers with 3s measuring time. The flow rate was set to 2.00
L/min.
The results indicated ECs could be a potential alternative
for pulmonary drug delivery. The droplet size distributions in ECs
were between 0.5-10μm in 3s measuring time. There were statistical
differences of Q3, D10, D50 and D90 between EC and nebulizers. In
D10, D50 and D90, the variability of droplet size in ECs was larger
than that in the nebulizers and the time to reach a stable droplet
size in the ECs were much longer than in the nebulizers. The D90
with different samples in the ECs were fluctuated. Though ECs could
delivery drugs to the lung, the EC performance should be improved.
There were many factors may affecting the aerosol generated from
EC. It is necessary to focus on the potential safer excipients,
technology of the EC manufacture and the strict guidelines on the
safety evaluation including the leachable and
extractable.
published_or_final_version
Pharmacology and Pharmacy
Master
Master of Medical Sciences
Subjects/Keywords: Atmospheric aerosols; Vaping; Cigarette smoke
Record Details
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APA (6th Edition):
侯璐; Hou, L. (2016). Droplet size distribution of electronic cigarette
aerosols. (Masters Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/249840
Chicago Manual of Style (16th Edition):
侯璐; Hou, Lu. “Droplet size distribution of electronic cigarette
aerosols.” 2016. Masters Thesis, University of Hong Kong. Accessed February 24, 2020.
http://hdl.handle.net/10722/249840.
MLA Handbook (7th Edition):
侯璐; Hou, Lu. “Droplet size distribution of electronic cigarette
aerosols.” 2016. Web. 24 Feb 2020.
Vancouver:
侯璐; Hou L. Droplet size distribution of electronic cigarette
aerosols. [Internet] [Masters thesis]. University of Hong Kong; 2016. [cited 2020 Feb 24].
Available from: http://hdl.handle.net/10722/249840.
Council of Science Editors:
侯璐; Hou L. Droplet size distribution of electronic cigarette
aerosols. [Masters Thesis]. University of Hong Kong; 2016. Available from: http://hdl.handle.net/10722/249840
North Carolina State University
29.
Gantt, Brett.
Marine Organic Aerosols and Their Implication to Air Quality.
Degree: MS, Marine, Earth and Atmospheric Sciences, 2009, North Carolina State University
URL: http://www.lib.ncsu.edu/resolver/1840.16/2173
► The global marine sources of organic carbon (OC) are estimated here using a physically-based parameterization for the emission of marine isoprene and primary organic matter.…
(more)
▼ The global marine sources of organic carbon (OC) are estimated here using a physically-based parameterization for the emission of marine isoprene and primary organic matter. The emission model developed in this study allowed us, for the first time, to explore the relative contributions of sub- and super-micron organic matter and phytoplankton-produced secondary organic aerosol (SOA) to the total OC fraction of marine aerosol. New laboratory measurements of isoprene production by several abundant phytoplankton species under a range of environmental conditions were scaled up, with the help of satellite products, to infer the total annual mean ocean isoprene emissions of 0.92 Tg C yr-1. The sensitivity studies using different schemes for the euphotic zone depth and ocean phytoplankton speciation produced the upper and the lower range of marine-isoprene emissions of 0.31 to 1.09 Tg C yr-1, respectively. Empirical relationships between emissions of water soluble (WSOM) and water insoluble (WIOM) organic matter (OM) and chlorophyll a concentration were used to estimate the total primary sources of oceanic sub- and super-micron OC of 1.26 and 19.01 Tg C yr-1, respectively. Using a fixed 3% mass yield for the conversion of isoprene to SOA, our emission simulations show minor (less than 0.2%) contribution of ocean produced isoprene to the total marine source of OC. However, our model calculations also indicate that over the tropical waters, marine isoprene-derived SOA could contribute over 40% of the total monthly-averaged sub-micron OC fraction of marine aerosol. The estimated contribution of ocean-isoprene SOA to hourly averaged sub-micron marine OC fluxes is even higher, reaching 100% over the vast regions of the oceans during the midday hours. As it is widely believed that sub-micron OC has the potential to influence the cloud droplet activation of marine
aerosols, our findings suggest that marine sources of SOA could play critical role in modulating properties of shallow marine clouds and influencing the climate.
The impact of marine isoprene emissions on summertime surface concentrations of isoprene, secondary organic
aerosols (SOA), and ozone (O3) in the coastal areas of the continental United States is studied using the U.S. Environmental Protection Agency regional-scale Community Multiscale Air Quality (CMAQ) modeling system. Marine isoprene emission rates are based on the following five parameters: laboratory measurements of isoprene production from different phytoplankton species under a range of light conditions, remotely-sensed chlorophyll-a concentration ([Chl-a]), incoming solar radiation, surface wind speed, and sea-water optical properties. Model simulations show that marine isoprene emissions are sensitive to meteorology and ocean ecosystem productivity, with the highest rates simulated over the Gulf of Mexico. With the isoprene reactions included in this study, the average contribution of marine isoprene to SOA and O3 concentrations is predicted to be small, up to 0.004 µg m-3 for SOA and 0.2…
Advisors/Committee Members: Nicholas Meskhidze, Committee Chair (advisor), Yang Zhang, Committee Member (advisor), Daniel Kamykowski, Committee Member (advisor).
Subjects/Keywords: marine aerosols; isoprene; phytoplankton
Record Details
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APA ·
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APA (6th Edition):
Gantt, B. (2009). Marine Organic Aerosols and Their Implication to Air Quality. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/2173
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gantt, Brett. “Marine Organic Aerosols and Their Implication to Air Quality.” 2009. Thesis, North Carolina State University. Accessed February 24, 2020.
http://www.lib.ncsu.edu/resolver/1840.16/2173.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gantt, Brett. “Marine Organic Aerosols and Their Implication to Air Quality.” 2009. Web. 24 Feb 2020.
Vancouver:
Gantt B. Marine Organic Aerosols and Their Implication to Air Quality. [Internet] [Thesis]. North Carolina State University; 2009. [cited 2020 Feb 24].
Available from: http://www.lib.ncsu.edu/resolver/1840.16/2173.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gantt B. Marine Organic Aerosols and Their Implication to Air Quality. [Thesis]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/2173
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Montana State University
30.
Thomas, Michael John.
In situ and solar radiometer measurements of atmospheric aerosols in Bozeman, Montana.
Degree: College of Engineering, 2011, Montana State University
URL: https://scholarworks.montana.edu/xmlui/handle/1/2419
► Atmospheric aerosols play a very important role in Earth's climate system. Aerosols provide one of the most significant uncertainties in the climate system, mainly due…
(more)
▼ Atmospheric
aerosols play a very important role in Earth's climate system.
Aerosols provide one of the most significant uncertainties in the climate system, mainly due to
aerosols differing greatly in different regions. Measuring these
aerosols accurately and effectively is very important. Inversions of solar irradiance and sky radiance measured by solar radiometers, for example those within the AErosolROboticNETwork (AERONET), provide aerosol properties within different regions across the world. Aerosol properties retrieved by AERONET are generally found to be very accurate and have been a very reliable source for aerosol measurements, but there are concerns about the inversion accuracy in very clean environments with low aerosol concentration. In this thesis, accuracy assessments are done on some of the aerosol properties retrieved by the AERONET inversion using in situ instruments making aerosol measurements at the ground. First, Bozeman, Montana and the surrounding Gallatin Valley's aerosol characteristics are assessed to show why this area is a good place to do these studies. Then, the real part of the refractive index retrieved from AERONET is assessed and shown to be potentially about 3.5% too high during the study period for all aerosol concentration conditions. Lastly, the aerosol size distribution that is retrieved by AERONET is assessed and found to be very accurate under well-mixed conditions in the boundary layer. Overall, the AERONET inversions are very accurate during these very clean conditions, with evidence of small (~3.5%) linear biases in the real part of the refractive index.
Advisors/Committee Members: Chairperson, Graduate Committee: Joseph A. Shaw. (advisor).
Subjects/Keywords: Atmospheric aerosols.; Refractive index.
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APA ·
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CSE |
Export
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Manager
APA (6th Edition):
Thomas, M. J. (2011). In situ and solar radiometer measurements of atmospheric aerosols in Bozeman, Montana. (Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/2419
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Thomas, Michael John. “In situ and solar radiometer measurements of atmospheric aerosols in Bozeman, Montana.” 2011. Thesis, Montana State University. Accessed February 24, 2020.
https://scholarworks.montana.edu/xmlui/handle/1/2419.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Thomas, Michael John. “In situ and solar radiometer measurements of atmospheric aerosols in Bozeman, Montana.” 2011. Web. 24 Feb 2020.
Vancouver:
Thomas MJ. In situ and solar radiometer measurements of atmospheric aerosols in Bozeman, Montana. [Internet] [Thesis]. Montana State University; 2011. [cited 2020 Feb 24].
Available from: https://scholarworks.montana.edu/xmlui/handle/1/2419.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Thomas MJ. In situ and solar radiometer measurements of atmospheric aerosols in Bozeman, Montana. [Thesis]. Montana State University; 2011. Available from: https://scholarworks.montana.edu/xmlui/handle/1/2419
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations
