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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 112 for “"Clay content"”.
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The Effect of Clay Content and Iron Oxyhydroxide Coatings on the Dielectric Properties of Quartz Sand
… pure quartz sand (Control), quartz sand/kaolin clay mixtures and ferric oxyhydroxide coated quartz sand. Results from the experiments show that the dielectric responses of quartz-clay and iron oxyhydroxide modified samples are not significantly different from the pure quartz Control. Increasing …
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Soil PH and clay content associated with chronic wasting disease in white-tailed deer in northern Illinois
… exchange capacity, organic matter, and water content), then used the outcome to assess possible pathways by which soil characteristics increase the probability of transmission via environmental contamination. The model indicates CWD is likely to be present where: soil pH is greater than 6.6, …
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Analysis of Soil Splash Erosion Under Simulated Rainfall
… was dependent upon soil type, with greater clay content soils exhibiting a greater threshold energy. Soil splash rate increased with increasing kinetic energy, with large differences between soils. Soil loss decreased with an increasing soil clay content and soil loss increased with …
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Cesium-137 fallout in Indiana soil
… Other parameters investigated included soil clay content, rate of rainfall, and soil pH. Each variable was examined for possible statistical correlation with Cs-137 retention. Both clay content and combined clay content/rainfall were significantly (p < 0.05) correlated with soil Cs-137 …
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Laboratory study of the effect of chemical osmosis on the elastic rock properties of Pierre shale and implication for oil recovery
… on several shale samples with varying clay content. The membrane efficiency of the shale samples was experimentally determined to be in the range of 10 to 30% depending on clay content and stress level. Swelling strains of the samples were determined from experiments to be 1% in high …
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Moisture diffusion through vinyl ester/clay nanocomposites
… samples containing up to 5 wt% montmorillonite clay; two different kinds of clay surface treatments were employed to make the clay compatible with the vinyl ester resin. These nanocomposites were characterized using differential scanning calorimetry (DSC), mechanical property measurements, x-ray …
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An investigation of factors influencing the bioavailability of silver nanoparticles within a terrestrial system
… were examined in addition to soil pH, humic content, and clay content. All insects in treatment groups with a soil concentration of 25 ppm or higher were found to contain at least trace amounts of silver. Root samples of both plant species were found to contain more silver than the other …
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Weathering Regimes and Pedogenic Variability on Large Boulders, Karkevagge, Northern Scandinavia
… field, laboratory, and statistical analyses: (1) Clay content was marginally greater in soils developed on garnet-mica-schist than mica-schist; (2) Silt and clay content did not reflect eolian sediment input; (3) Soils that have formed on boulder tops are characterized as residual soils; (4) …
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Impact of Soil Properties on Removal of Emerging Contaminants from Wastewater Effluent During Soil Aquifer Treatment
… from effluent had a correlation with (1) high clay content, (2) small Darcy Velocity, (3) high soil organic matter content, and (4) low sand content. Based on the 6 peer-reviewed research studies reviewed, the removal of nanomaterials is affected by clay content and sand content, but not soil …
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Total Organic Carbon and Clay Estimation in Shale Reservoirs Using Automatic Machine Learning
High total organic carbon (TOC) and low clay content are two criteria to identify the "sweet spots" in shale gas plays. Recently, machine learning has been proved to be effective to estimate TOC and clay from well loggings. The remaining questions are what algorithm we should choose in the first …
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Soil mineralogy of an upper coastal plain landscape in Virginia
… Upper Coastal Plain of Virginia due to the high clay content of the deposit. The original intent of this study was to identify the mineralogy present in the proposed mining area and to determine similarities and differences among sampled pedons. Twenty-eight typical pedons were sampled throughout …
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The Effect of Clay, Cement and Fibers on the Strength and Durability of Compressed Earth Blocks
… the effect of soil characteristics, cement content and fibers on the strength and durability of compressed earth blocks (CEBs). This work expands on the available information regarding the constituent properties which affect the compressive and tensile strengths and durability of CEBs. …
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Distribution of the Percent Aluminum Saturation in Soils on the Burlington and Elsey-Reeds Spring Geologic Formations in Northern Stone County, Missouri
… distribution and the correlation of percent clay, percent organic matter, extractable calcium and pH with percent aluminum saturation for planning purposes. Most of the soils studies had a moderate to very high potential for aluminum toxicity. There was little consistent correlation between …
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The etiology of the decline of eastern white pine (Pinus strobus L.) on Virginia landscapes: a survey of stress factors
… centered around the soils with soil pH, clay content, amounts of compaction and soil disturbance as the most prominent factors derived from the study. Soil pH averaged 6.95 with a range of 5.9-8.1 for decline habitats; while the pH averaged 5.50 with a range of 5.0-6.0 for the natural …
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A spatial analysis of Muncie's soils and playground dust associated with elevated blood lead levels
… of soils, including soil pH, organic matter, and clay content, were explored. It was found that clay content had a significant negative association with lead, corroborating clay minerals' role in restricting lead extraction due to their strong binding affinity with lead. The findings showed that …
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Predicting corrosion on protected buried steel natural gas distribution pipelines
… of the soil; the variation of soil pH; average clay content in the soil; variation of clay content in the soil; and the average saturated hydraulic conductivity of the soil. The second model addresses the second question by using the previous year's routine maintenance and weather data with a …
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Study of the organic content and mineralogy effects on the acoustic properties of the Niobrara Formation, Denver Basin
… This study investigates the effects of TOC, clay content and kerogen maturity levels on the acoustic properties of Niobrara chalk and marl intervals. Core samples from Gill Land Associates 2 and Berthoud State 3 wells were analyzed for total organic content richness and maturity. …
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Pedogenesis, weathering processes, and elemental distribution along a soil climosequence in the southern Piedmont
… in secondary minerals formation. Clay content is linearly related to Fed in Virginia, North Carolina, and Georgia soils, with regression slopes decreasing from north to south. Clay content levels off at higher Fed values for Alabama soils, indicating that i) steady-state conditions …
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Analysis of calcite-filled faults in carbonate strata, balcones trend near Waco, Texas.
… to chalky marl to relatively weak marl. Higher clay content yields weaker rock. The dip angle of the normal faults varies with rock strength, with steeper dips across the stronger strata. Carbon stable isotopes in 174 samples indicate that the water from which the calcite precipitated is …
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ΤΕΧΝΙΚΟΓΕΩΛΟΓΙΚΟΙ ΧΑΡΑΚΤΗΡΕΣ ΤΩΝ ΜΑΡΓΩΝ ΗΡΑΚΛΕΙΟΥ ΚΡΗΤΗΣ
… EXAMINED. CONSEQUENTLY, SOME RESULTS FOR THEIR CLAY PARTICLES AGGREGATION AND THEIR ACTIVITY ARE PRESENTED AND SOME CORRELATIONS OF CALCIUM CARBONATE CONTENT WITH PLASTICITY AND CLAY CONTENT ARE DETERMINED . GEOMECHANICAL CHARACTERISTICS OF THESE MARLS, SUCH AS RESISTANCE TO PENETRATION OF …
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