Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Atmospheric Pollutant"”.
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Atmospheric pollutant dispersion on industrial sites: concentration fluctuations in complex geometry terrains
L'abstract è presente nell'allegato / the abstract is in the attachment
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Atmospheric Pollutant Levels in Southeast Brazil During COVID-19 Lockdown: Combined Satellite and Ground-based Data Analysis
With the ongoing COVID-19 pandemic being spread all over the world, lockdown measures are being implemented making air pollution levels go down in several countries. In this context, the air quality changes in the highly populated and trafficked Brazilian states of Sao Paulo (SP) and Rio de Janeiro …
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Modelagem dos processos físico-químicos e atmosféricos envolvidos na formação de oxidantes fotoquímicos em megacidades: o caso da região metropolitana do Rio de Janeiro
… methodologies were developed that provided atmospheric emissions databases in high resolution. Statistical assessments of system performance were performed comparing with observed data from meteorological stations and the air quality monitoring network, and an investigation of atmospheric …
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Summertime ozone pollution in China: Observations and Simulations
Ground-level ozone is a secondary atmospheric pollutant that damages human and vegetation health. The chemical production of ground-level ozone involves the photochemical reactions between nitrogen oxides (NOX = NO + NO2) and volatile organic compounds (VOCs). China is experiencing high levels of …
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Aqueous Atmospheric Species, a Dual Study: 1. Comparison of the Effects of Temperature, Oxygen Level, Ionic Strength, and pH on the Reaction of Benzene with Hydroxyl Radicals at the Air-water Interface to the Bulk Aqueous Phase. 2. Determination of Carbonyl Compounds in Fog Water Samples via Online Concentration and HPLC
… is the largest interface in the environment. Atmospheric droplets, such as fog, which can have an exceptionally high surface area-to-volume ratio, also have a large range of physical and chemical properties (e.g. temperature, pH, ionic strength, and chemical composition) based on location, …
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Tropospheric Ozone over the Middle East and Its Interannual Variability: An Integrated Analysis with Satellite Observations and a Global Chemical Transport Model
Tropospheric ozone is a major atmospheric pollutant and a greenhouse gas. Nevertheless, many processes influencing its spatio-temporal distribution are still poorly understood, mainly due to the lack of adequate observations. One such region is the Middle East, where ozone measurements are scant. …
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Supercontinuum radiation for ultra-high sensitivity liquid-phase sensing
… of environmentally toxic species and atmospheric pollutant sensing. There is a growing demand for suitable techniques that are not only sensitive, but also simple to operate, fast and versatile. Most currently available techniques, such as spectrophotometry, are neither sensitive …
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An investigation into air quality with an emphasis on the design and development of a numerical model for the transport of gaseous and particulate pollutants in airborne and deposited matter
… for the transport of gaseous and particulate pollutants in airborne and deposited matter. The reported programme of research was undertaken with the dual aim of; establishing a programme of monitoring in order that ambient concentrations of selected air pollutants, released from various …
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Farm waste management: the effects of fine bubble aeration on cattle slurry and the fate of ammonia during the treatment process
… as stripped NH3 can present a significant atmospheric pollutant. Here aeration treatment was studied at laboratory-scale (1 litre) and pilot-scale (100 litres). Air was externally supplied to tubular fine bubble diffusers. Initially a settleable floculative microbial culture was developed …
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Role of biomechanics and tumor microenvironment in osteosarcoma progression
… study which shows the pro-fibrotic effect of atmospheric pollutant PFAS on the pulmonary microenvironment. Our findings show that PFAS compound “PFOA” induces aggressive fibrosis in the lung only through inhalation in a relatively short time. These findings could be used to create new models …
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Sub 2 nm Particle Characterization in Systems with Aerosol Formation and Growth
… continual advances in material synthesis and atmospheric pollutant control. Among these advances, one important frontier is characterizing the initial stages of particle formation by real time measurement of particles below 2 nm in size. Sub 2 nm particles play important roles by acting as …
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Electrical detection of atmospheric pollutants and detergents on silicon
… represent significant challenges today. Many air pollutants consistently exceed exposure levels the World Health Organization (WHO) recommends. Establishing an extensive network of high-quality sensors capable of accurately detecting primary pollutants is essential for conducting global air …
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Evaluating Relationships between Mercury Concentrations in Air and in Spanish Moss (<em>Tillandsia Usneoides</em> L.)
… contamination to soil, water, and biota is atmospheric deposition. Therefore, comprehensive monitoring of atmospheric concentrations is important. Limitations of conventional atmospheric measurement techniques include high cost and lack of temporal or spatial integration. Bioindicators, …
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Molecular weight growth pathways in fuel-rich combustion
… to rubbers as well as being an undesirable atmospheric pollutant. Both are emitted from many typical combustion processes such as diesel engines, wood fires, furnaces, etc. Though the area has received much attention, the fundamental chemical mechanisms for formation of both P AH and soot …
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Investigations of the Therman Treatment of Sodium Thiosulfate in Gas Streams for the Removal of I2
<p>The aim of this work was to study the performance of sodium thiosulfate in several systems. Sodium thiosulfate decomposition and SO2 conversion were analyzed using thermogravimetric analysis combined with chromatographic techniques. Thermogravimetric analysis (TGA) measurements determined the …
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Monitoring of atmospheric polycyclic aromatic hydrocarbons through optimization of analytical techniques
Atmospheric pollutant monitoring in low to medium-income countries can play a vital role in improving human welfare through reductions in environmental impacts and the global burden of disease. Polycyclic aromatic hydrocarbons (PAHs) have been widely used as markers of environmental pollutants in …