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 7 of 7 for “"freeze/thaw conditions"”.
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Characteristic Raman Bands of Amino Acids and Halophiles as Biomarkers in Planetary Exploration
… survived a combination of simulated martian conditions, e.g. freeze-thaw cycling resulted in a maximum of 20 % biomarker signal loss for AA. Halophilic microbes survived UV exposure up to 3.5 sols, though with a complete biomarker signal loss. However, cell counts and hence, survival in near …
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Stress-tolerant bioremediation strategy for cold-climate sites: laboratory, modelling, and field studies for extending petroleum hydrocarbon biodegradation to seasonally freezing and frozen contaminated soil phases
… changes in cold soils subjected to seasonal freeze-thaw conditions. In a pilot-scale biopile (3.5 tonnes) of nutrient-amended hydrocarbon-contaminated fine-grained soils operated over the winter at a cold-climate site, hydrocarbon biodegradation was enhanced during seasonal freezing and …
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Evaluating CEN/TS 12390-9 To Assess Concrete for UK Freeze-Thaw Exposure Conditions
… over the performance of these concretes in freeze-thaw environments. This research project investigated the influence of cement type on concretes subjected to freeze-thaw conditions and the correlation between the microstructural properties of concrete and freeze-thaw performance using the …
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Evaluation of Urban Riparian Buffers on Stream Health in the Tookany Watershed, PA
… fluctuations in turbidity based both on riparian conditions and geomorphic positioning, suggesting that future studies need to be careful with logger placement when using sediment calibration curves to estimate sediment yield within streams. There were pros and cons of using both total station and …
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Nutrient release from winter cover crops exposed to freeze-thaw events
… cover crop biomass after cycles of freezing and thawing. These freezing events may cause ice crystals to form in and between plant cells which can, in turn, result in cell lysis and tissue damage, consequently inducing nutrient release. Laboratory and field experiments were done to determine the …
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Freeze-Thaw Resistance and Microstructural Characteristics of Concretes Containing Pozzolans
… and to assess the effects of such pozzolans on freeze-thaw durability, air void system and microstructure of hardened concrete. Cement was partially replaced by various quantities of the pozzolanic materials. The results demonstrated that the increase in workability attributed to the …
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Effect of Surface Moisture Condition on Substrate-Repair Concrete Overlay Transition Zone
… will be exposed to several environmental conditions that ultimately affect its durability and lifespan. These conditions include repeated freezing and thawing, chloride intrusion, sulfate attack, alkali-silica reaction, and many others. Given the age and condition of American …