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 26 for “"seasonal trend"”.
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Phytoplankton Abundance and Species Composition in Relation to Environmental Paramenters in Coastal Mississippi Waters
… at stations 1 and 4 where there was no major seasonal trend. At station 8 there was a clear seasonal trend where diatoms predominated in the winter, prymnesiophytes increased in spring, and cyanobacteria and diatoms predominated during the summer.</p>
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Gregarine parasitism in dragonfly populations of Central Texas with an assessment of fitness costs in Erythemis simplicicollis.
… Prevalence and intensity exhibited strong seasonality during both years at one of the reservoirs, but no seasonal trend was detected at the wetland. The seasonal trend at the reservoir suggests that gregarine oocyst viability parallels increasing host population densities and may be …
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The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7
… minor contribution to the total fluxes.</p> <p>A seasonal trend was observed in the depositional flux of Be-7, with a pronounced maximum in the Spring. Approximately 40 percent of the annual Be-7 deposition occurred between February and April, with a maximum in March. This is consistent with the …
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Divide and recombine: Autoregressive models and STL+
… network from November 2011 to April 2013. ^ The Seasonal-Trend Decomposition procedure based on loess (STL+) is used to model the CIDR series. Motivated by the CIDR series analysis, we propose a general prediction based model selection procedure, where extensive visual diagnostics are part of the …
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MORPHO-PHYSIOLOGICAL EVALUATIONS OF ALEPPO AND BRUTIA PINE SEEDLINGS UNDER TWO DIFFERENT MOISTURE REGIMES (SYRIA, AFFORESTATION, CHLOROPLASTS).
… species were similar in height growth and in the seasonal trend of total non-structural carbohydrates (reducing sugars and starch). Brutia pine had more reducing sugars and less starch in its shoots than Aleppo pine. The latter had a greater amount of total non-structural carbohydrates and starch …
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Divide and recombined for large complex data: Nonparametric-regression modelling of spatial and seasonal-temporal time series
… of loess on time series decomposition, called Seasonal Trend Loess (STL). The chapter is closed by the introduction of D\&R; (Divide and Recombined) statistical framework. Data can be divided into subsets, each of which is applied with a statistical analysis method. This is an embarrassing …
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Investigation of Trends and Predictive Effectiveness of Crash Severity Models
… probability for seniors, as well as a distinct seasonal trend. Other time-dependant trends in the data were visible, but not significant.</p> <p>Additionally, this research investigates the use of partial proportional odds (PPO) as a statistical modeling technique to compromise between ordinal …
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Treatment performance assessments of different wetland mesocosms
… impact of within bed cloggingPertaining to seasonal variability, findings show that COD, nitrate-nitrogen and ammonia-nitrogen have shown a seasonal trend with high removal in summer compared to other seasons, while BOD removal was efficient in winter compared to summer and turbidity was …
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Measuring Ground Movement by Precise Survey
… with the current retrogressive slide model. A seasonal trend in the rates of movement was also apparent suggesting a correlation between slide movement and environmental effects such as freeze-thaw, rainfall or river level. Surveying accuracies expressed in the form of 95 percent error …
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Statistical Quality Control Algorithm for In Situ Sea Surface Temperatures
… and correlation filter based on STL ("seasonal"-Trend decomposition using LOESS) to identify observations inconsistent with expected diurnal behavior, and (3) a revised external reference check that compares smoothed satellite SST fields to platform-specific trend baselines. The …
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The role of the large-scale modes of climate variability in the Southern African wave climate
… is chosen to assess long-term variability and trends around the coastline between 1979 and 2020. Seasonal trend analysis revealed significant increasing trends in offshore flux for all seasons, with spring having the strongest coastal trends. The role of the Southern Annular Mode (SAM), El Nino …
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Under Pressure: Decomposing and Predicting Methane Emissions Variability in U.S. Oil and Gas Basins
… - across five major basins, and find a strong seasonal trend as well as significant week-to-week variation. I find that this variability can be explained with weather, natural gas infrastructure, and economic variables through both econometrics and simple machine learning approaches. These …
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The Geochemistry of Selenium and Sulfur in a Coastal Salt Marsh
… to June 1986. Sampling times coincided with the seasonal redox cycle known to occur within the marsh system. Sediments were analyzed for various selenium and sulfur phases.</p> <p>Iron monosulfides and elemental sulfur both display large seasonal changes in concentration and distribution with …
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Carbon and Water Relations in Pinus Taeda: Bridging the Gap across Plant Physiology, Genomics, and Global Climate Change
… by a decrease in that number, matched the seasonal trend of tree growth and photosynthetic response to elevated CO<sub>2</sub> in this species. The seasonal trend also reflected the interaction among multiple abiotic factors intrinsic to field conditions and emphasized the relevance of …
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Inter-Annual to Inter-Decadal Variability of Upwelling and Anchovy Population off Northern Chile
… time series are analyzed using the STL method (Seasonal Trend Decomposition procedures based on locally weighted regression and smoothed scatter plots (LOESS)), maxima entropy spectral analysis, wavelets, cross spectra, and EOFs (Empirical Orthogonal functions). The wind field from ERS and …
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A Remote Observatory for Geocoronal Hydrogen Emissions
… on an original model-data comparison of seasonal trends in Balmer-a emission intensity diurnal variation. This investigation serves as a demonstration of the scientific contributions that the INSpIRe observatory is capable of providing and shows, for the first, a seasonal trend in the …
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Hailfall in a future climate using a pseudo-global warming approach
… in the hailfall area at the ground also showed a seasonal trend, with increases in cold-season events and decreases in warm-season events. Melting depths increased for all PGW environments and there is evidence that this increase contributes to greater area of rainfall for warm-season events where …
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Water quality of a mountain watershed in Colorado
… and rain, summer storms, or irrigation. The seasonal trend for the coliform, FC, and FS bacteria groups was similar: (1) low counts prevailed while the water was 0°C, although bacteria from all groups were isolated during winter; (2) high counts appeared during the rising and peak flows …
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Variations in pollen and fungal spore air spora: an analysis of 30 years of monitoring for the clinical assessment of patients in the Western Cape
… Differences in the annual distribution and seasonal limits of the air spora in the two aerobiomes were found using statistical techniques. Results: Significant differences were found between the tree pollen loads in the different aerobiomes. Spring pollinating trees were the most prevalent …
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A comprehensive modeling approach for BMP impact assessment considering surface and ground water interaction
… the performance of DANSAT in predicting temporal trend and spatial distribution of sediment loads was acceptable only within Owl Run watershed, where high correlations between flow rates and sediment loads exist. The predicted total pesticide loads were within ±100% of observed values. DANSAT …
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