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 37 for “"cold regions"”.
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DEHUMIDIFICATION OF GREENHOUSES IN COLD REGIONS
Greenhouses in cold regions often exhibit conditions of high relative humidity (RH). Frequent high RH levels of over 80% result in poor yields and undesirable crop quality, as well as poor working conditions for employees. The objective of this study was to seek an effective and economical …
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Multi-Scale Modelling of Cold Regions Hydrology
… issues related to the hydrological cycle. Cold region hydrological models have requirements to calculate phase change in water via consideration of the energy balance which has high spatial variability. This motivates the inclusion of explicit spatial heterogeneity and field-testable …
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An integrated wind-powered energy system for residential applications in cold regions
… applications of a remote community in a cold region. The novelty of the system is that it uses a wind turbine to directly power the heat pump, with the sea water as the evaporator that provides a constant temperature, without the need to use the wind turbine to convert the wind energy to …
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Design and Construction of Pavements in Cold Regions: State of the Practice
… in the design and construction of roadways in cold regions throughout the United States. The penetration of frost into pavement structures can lead to differential frost heave during winter and thaw weakening during spring. Both of these damage mechanisms lead to premature pavement distress, …
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USE OF CELLULAR CONCRETE FOR AIR CONVECTION EMBANKMENT TO PROTECT PERMAFROST FOUNDATION IN COLD REGIONS
… caused by climatic extremes in permafrost regions for over three decades. However, the desired crushed rocks needed for ACE are not readily available in many areas of interior Alaska. Burdened by the need to ship suitable rocks to remote locations, the cost of constructing an ACE is often …
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The Impacts of Climate and Landscape Change on Catchment Scale Material Transport in High Mountain and Seasonally Cold Regions
<p>Streamflow in high mountain and seasonally cold regions follows annual patterns that can make water quality and availability in these areas uniquely susceptible to changes in climate and land use. Precipitation in the form of snow accumulates during the winter months and gradually melts in the …
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Freeze-Thaw Durability of Pervious Concrete
… on the durability of pervious concrete in cold regions, the objective of this research was to evaluate the resistance of pervious concrete to degradation during freeze-thaw cycling under different soil clogging and water saturation conditions. The laboratory research associated with this …
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Simulating and quantifying land-surface biogeochemical, hydrological, and biogeophysical processes using the Community Land Model version 4
… as the root transpiration/water removal and the cold-region infiltration with the soil ice freeze/thaw status involved affect soil water content and soil temperature, and regulate carbon- and nitrogen-stock variations. Last but not least, mineral dust, a type of atmospheric aerosol, alters …
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Experimental investigation of soil volume changes during freezing and thawing
… civil engineering projects, especially in cold regions or where artificial ground freezing (AGF) is employed. Freezing causes water in the soil pores to turn into ice, which expands, leading to ice lens formation and frost heave. Thawing causes the ground to settle, potentially damaging …
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Demonstrating the feasibility of polyethylene passive samplers for quantitative assessment of volatile organic compounds in soil
… were tested in an actual site at the U.S. Army Cold Regions Research and Engineering Laboratory (CRREL) and showed consistent results with the available data. The results of this thesis demonstrated that the PE passive sampling is a promising technique to measure VOCs in soil vapors.
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An Improved Water-Driven Sediment Yield Model for Cold Agricultural Regions
… water-driven erosion occurring in agricultural regions, is a significant source of pollution and damage to the aquatic environment. Excess sediment erosion promotes the transport of phosphorus to lakes, which can increase cyanobacterial growth, cause sedimentation that limits the lifespan of …
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Evaluation of the AASHTO Mechanistic Empirical Pavement Design Guide: an experimental and analytical investigation of the performance of flexible roads
… permanent deterioration in asphalt pavements in cold regions.
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Long-Term Performance of Seismically Rehabilitated Corrosion -Damaged Columns
… the long-term seismic performance in cold regions of corroded reinforced concrete columns that are repaired using advanced composite materials (ACM). Although the success of ACM in upgrading the structural response of reinforced concrete columns has been established in the past, the …
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Biochar as a soil amendment to enhance petroleum hydrocarbon degradation in northern landfarms
Extreme environmental conditions in northern regions slows efforts to remediate petroleum hydrocarbon (PHC) contaminated soils through conventional landfarming practices. Thus, cost-effective soil remediation strategies that are active under frozen conditions and specific to cold regions are in …
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An Evaluation of British Royal Naval Arctic Exploration Techniques: 1818-1876
… peoples' methods of travel and survival in cold regions. The Royal Navy, in a burst of arctic exploration between the years 1818-18?6, achieved great success too in mapping over one-half of the North American and Canadian Arctic, where the main effort of exploration was centred, and in the …
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Moisture Conditions and Frost Resistance of Concrete in Hydraulic Structures
… long-term behaviour of hydraulic structures in cold regions. Superficial damage, similar in appearance to salt scaling of concrete, can be seen at the waterline of hydraulic structures, such as hydro power structures. Progressive damage to the concrete surface results in exposure of coarse …
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Evaluation and improvement of frost durability of clay bricks
In cold regions like Canada, frost action was reported to be the major cause of disintegration of brick veneer. Two approaches to ensure frost durability of clay bricks were studied in this research. One involved the evaluation of durability, while the other studied the improvement of durability …
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The Role of Epigenetics in the Regulation of Meiotic Recombination in Triticum aestivum and Arabidopsis thaliana
… recombination events to previously suppressed regions of the genome. Remodelling of crossovers to cold regions is of particular interest to crop breeders, who seek to unlock genomic regions to crossovers to identify novel, beneficial allelic combinations. To further characterize the meiotic …
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Measurement and Simulation of Preferential Flow in Frozen Soils
… of snowmelt and hydrological functioning of cold regions. Preferential flow in macropores may enhance infiltration into frozen soil, but flow dynamics are complicated by coupled water and heat transfer processes. Field studies were conducted in the Canadian Prairies to evaluate the dominant …
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