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 20 of 33 for “"exposure duration"”.
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Effect of vibration exposure duration on discomfort
… very little is known about the effects of the duration of exposure to vibration on comfort.<br/>This thesis investigates the effects of body support, frequency, waveform, and direction of excitation on the Subjective Discomfort Time-Dependency (SDTD) during vibration so as to improve …
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Primary Factors Affecting Growth of Microalgae Optimal Light Exposure Duration and Frequency
… time optimize the land use, the optimal light exposure duration and frequency are important factors in the design a photobioreactor which contained two parts was tested. One part of the PBR was exposed to the light, while another part of the PBR was placed underground without light. Different …
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Effect of exposure on the erodibility of intertidal mudflats
… exposed during low tides. Under the effect of exposure, the water content of sediments decreases because of the evaporation process, which alters the erosive behaviour of cohesive sediments, and therefore changes the patterns of erosion/accretion on intertidal flats. Consequently, exposure …
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ASSESSMENT OF POLYCYCLIC AROMATIC HYDROCARBON BIOAVAILABILITY FROM SOIL USING THE JUVENILE SWINE MODEL
… PAH bioavailability from single and repeated exposure to PAHs in different spiked exposure media, assessing PAH bioavailability from soil collected from PAH impacted sites, and assessing biomarkers of exposure and effect following PAH exposure. The effect of exposure duration on …
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The role of Attentional Binding in Hallucination Proneness
… categorisation as a function of perceptual load, exposure duration, stimulus category (living versus non-living), colour, and occlusion, and whether observed differences reflect impaired perceptual sensitivity or response bias. Methods: Four web-based experiments were conducted with healthy …
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Tidal Materialities: Place through Time and Making An Exploration of Coastal Wrack as a Regenerative Architectural Material in Atlantic Canada
… seaweed as a material that takes form through exposure, duration, and locality. Rather than seeking full standardization, the thesis works with variability as a design condition. The resulting design responses translate these material findings into architectural propositions that foreground …
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Intertidal mudflats and the conservation of migratory shorebirds
… I developed a framework to map mean tidal flat exposure duration per tide cycle using satellite imagery and global tide models, providing the first large-scale assessment of intertidal habitat availability in Bangladesh. My findings revealed substantial variation in tidal flat exposure among …
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Influences of supraoptimal root-zone temperature on the medium solution and growth of woody nursery crops
… of 28°, 34°, 40°, 46°, or 52°C for daily exposure duration of 1, 2, 4, 6, or 24 hours for 20 days. Treatment temperature of at least 40°C with a daily exposure duration of 24 hours resulted in an increase in medium solution NH₄-N concentration. Similar increase in NH₄-N was found for 2 …
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Investigation of Chloride-induced Stress Corrosion Cracking for Long-Term Storage of Spent Nuclear Fuel in Dry Storage Systems
… several factors, such as material composition, exposure temperature, relative humidity, applied tensile stress, and atmospheric salt concentration. An accelerated experiment was designed to simulate marine environments in a controlled fogging chamber to examine 304 and 304L stainless steel …
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Examining the biophysics of ultrasound and contrast agent induced angiogenesis
… response to ultrasound-ultrasound contrast agent exposure and state that inertial cavitation, or microbubble collapse, is possibly required for angiogenesis to occur. Numerous small-scale studies have shown promising results; however, when large scale double blind studies were conducted, they …
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Assessment of the Efficacy of a Constructed Wetland to Reduce or Remove Wastewater Effluent Estrogenicity and Toxicity Using Biomarkers in Male Fathead Minnows (Pimephales Promelas Rafinesque, 1820)
… in frequency and magnitude with increased exposure duration and was greater ("=0.05) than controls after 2 and 3 weeks of exposure. The level of vitellogenesis induced by effluent exposure was high compared to similar studies. A spring season evaluation followed. Biomarkers in P. promelas …
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Environmental risk management of contamination of marine biota by hydrocarbons specifically those arising following an oil spill.
… The t1/2 ranged between 0.5- 22 d (acute exposure) and 3.8- 31.5 d (chronic exposure).The longer apparent t1/2 calculated for the chronically impacted mussels was attributed to the retention of the compounds in a stable compartment due to long period of exposure that limited exchange with …
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The Effect of Differing Degrees of Automation and Reliability on Simulated Luggage Screening Performance
… aid (decision aid) across different stimulus exposure durations of 250 ms, 500 ms, 1000 ms, 2000 ms, or 3000 ms. Participants were asked to judge the presence of a knife in each of the bags and either “stop” the bag or “pass” the bag. Reliability of the automated aids was 90% in Experiment 1 …
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Corrosion Dynamics of Cobalt-Chromium Alloy F-75 Powder
… rate as a function of particle diameter and exposure duration. Two observations were noted from the results. First, cobalt concentration (no chromium was detected) increased as a logarithmic function of time. For the 44, 105, and 420 µm diameter powders, cobalt concentration increased rapidly …
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The postantibiotic effect of the carbapenem antibiotics on gram-negative bacteria
… of microbial growth occurring after a short exposure to an antimicrobial agent. PAE appears to be a property of the majority of antimicrobial agents and is demonstrated by a wide variety of microorganisms. At present, carbapenems and penems are the only members of the -lactam group of …
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Relationship between Industry and Occupation with Cancer Using the Illinois BRFSS Survey (2018 to 2022)
… on Cancer (IARC) classifications to identify exposure to known (Group 1), probable (Group 2A), or possible (Group 2B) carcinogens. Multiple logistic regression models were conducted, considering complex survey design and adjusting for demographic, socioeconomic, and lifestyle factors. A …
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Assessment of Petroleum Hydrocarbon Contamination In Terrestrial Ecosystems Using Conventional and Novel Approaches
… and modes-of-action, with a much shorter exposure duration than traditional growth endpoints.
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The evaluation of novel nanoporous materials for use in interventional cardiology
… and NO on cell viability, aging effects, and exposure duration on cytotoxicity are examined, emphasising the importance of MOF design. Additionally, various materials (films, rods, tubes) display distinct cytotoxicity trends, highlighting the role of polymer type and structure. Notably, low …
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Seaweed as a value-added product for the food and drink sector
… a result. Se oxidation<br/>state, concentration, exposure duration and the seaweed species used influenced Se uptake and chemical changes. Exposing seaweed to Se could, therefore, be a potential method for developing products that help individuals meet the recommended Se intake levels and perhaps, …
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Natural and Anthropogenic Drivers of Variation in Bumble Bee Gut Microbiotas
… caused by anthropogenic drivers, like pesticide exposure, and natural factors, like diapause and host species. In Chapter 2, I qualitatively and quantitatively synthesized literature on pesticide-induced disturbances in bee gut microbiotas. I found that core phylotypes vary in their …
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