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 24 for “"LTER"”.
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Exploring the microbe-mediated soil H² sink : a lab-based study of the physiology and related H² consumption of isolates from the Harvard Forest LTER
… were isolated from the Harvard Forest LTER and used to characterize H² uptake alongside analysis of their life cycles. It was found that containing the gene encoding for the specific hydrogenase predicted H² uptake behavior in the wild Streptomyces strains and also in more distantly …
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Attitude Determination and Control of Nano-Satellites
… are explored. In particular, an extended Kalman lter is developed to obtain accurate angular rate information from noisy rate measurements. These rate measurements may be provided by either rate gyros or by successive vector measurements. A linear Kalman lter is developed to obtain an accurate …
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An Analysis of the Effects of Temperature and Other Environmental Factors on Microorganismal Productivity within Aquatic Ecosystems using Long-Term Data from Various Lter and Ilter Sites
… in regression models with data from the LTER and iLTER network of sites that ranged from the poles to the equator. I found a positive relationship between temperature and productivity. Antarctica and Arctic sites exhibited the strongest positive relationships supporting prior research …
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A modeling study of the marine biogeochemistry, plankton dynamics, and carbon cycle on the continental shelf off the West Antarctic Peninsula
… and have been investigated by the Palmer-LTER since 1991. Given the data acquisition constraints imposed by weather conditions in this region, an ocean circulation, sea ice and biogeochemistry model was implemented to help fill the gaps in the dataset. The results with the present best …
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On Doitchinov's quietness for arbitrary quasi-uniform spaces
… that no suitable concept of a quiet Cauchy¯lter pair exists which could replace the quasi-pseudometric concept of a bal-anced Cauchy ¯lter pair in the quasi-uniform setting. Under these circum-stances we therefore suggest that in an arbitrary quasi-uniform space, weshould work with a …
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A modeling study of the marine biogeochemistry, plankton dynamics, and carbon cycle on the continental shelf off the West Antarctic Peninsula
… and have been investigated by the Palmer-LTER since 1991. Given the data acquisition constraints imposed by weather conditions in this region, an ocean circulation, sea ice and biogeochemistry model was implemented to help fill the gaps in the dataset. The results with the present best …
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A near-optimal wavelet-based estimation technique for video sequences
… to accomplish this goal without using a Wiener lter, which can de-noise signals and is optimal in the mean-square error sense, but is hard to implement because second-order statistics may be unknown and because of the inversion of a possibly large matrix. Instead, an approximation of the Wiener …
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Integrated Study Of Dinoflagellate Diversity In The Gulf of Naples
… To study their seasonal diversity at the LTER-MC station in the Gulf of Naples, I used high throughput sequencing (HTS) metabarcoding of the V4 region in the 18S rDNA. To taxonomically identify the metabarcode sequences, I established a database, called DinoREF, of taxonomically verified …
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Towards a dynamic view of genetic networks: A Kalman filtering framework for recovering temporally-rewiring stable networks from undersampled data
… dynamics, we formulate a constrained Kalman ltering framework, which recursively computes the minimum mean-square, sparse and stable estimate of the network connectivity at each time point. The sparsity constraint is enforced using the weighted l1-norm; and the stability constraint is …
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The Impact of Urbanization on Benthic Macroinvertebrates in Southern Appalachian Streams
… project was from the Coweeta Hydrologic Lab NSF-LTER grant. Additional funding was provided through a Graduate Research and Development Project grant from the Graduate Student Assembly of Virginia Polytechnic Institute and State University. Matching funds were provided by the Biology Department.
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The Sleepless Forest Observers : Ecologists are using remote observation to advance their understanding of environments. Are they losing something in the process?
… Foundation funded Long-Term Ecological Research (LTER) Network sites in 1980. LTER Network sites focus on long-term and large-scale ecological processes. As a result, the Andrews has a long history of research on forests, streams, and watersheds, which makes it an especially good place to assess …
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Refinement of Subnetwork Discovery Algorithm for Biological Networks
… multiple times and develop a statistical lter to retain consistent genes appearing across JAM runs. Furthermore, we apply this improved version of JAM to DC (Dendritic Cell) maturation microarray data and KEGG pathways to study the underlying mechanisms behind the DC maturation process, an …
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Controls over the distribution of soil micro-invertebrates in the McMurdo Dry Valleys, Antarctica
… Dry Valleys Long-Term Ecological Research (LTER) program, encompassing ~30 years of physical and chemical soil data linked to micro-invertebrate abundance. These datasets serve as the foundation for Chapter 2, which applies statistical and machine learning models, including logistic …
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Markerless multiple-view human motion analysis using swarm optimisation and subspace learning
… resulting in increased user discomfort. As an alternative solution, research on markerless human motion analysis has increased in prominence. In this thesis, we present three human motion analysis algorithms performing markerless tracking and classification from multiple-view studio-based video …
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Robust GM Wiener Filter in the Complex Domain
… used in radar systems for their ability to "filter clutter, interference and jamming signals. One major flaw with early STAP radar systems is the reliance on non-robust estimators to estimate the noise condition. When even a single outlier is present, the earliest STAP radar systems would break …
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Constructing an Informative Prior Distribution of Noises in Seasonal Adjustment
… which is built on ARIMA models and linear lters. On the other hand, state space modelling (abbreviated to SSM) is also a popular method to solve this problem and researchers including J. Durbin, S.J. Koopman and and A. Harvery have contributed a lot of work to it. Unlike linear lters and …
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Ascomycetes From North Temperate Lakes in Wisconsin
… are part of the Long Term Ecological Research (LTER) project and have been the subject of limnological studies since the early 1900's. Our knowledge of freshwater ascomycetes is fairly recent and based on studies done in the past 50 years. Freshwater ascomycetes are defined as species that occur …
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Systematic Measurement of Centralized Online Reputation Systems
… build trust, reduce information asymmetry and lter information. Aim: Much research in the area has focused on analyzing single type systems and the cross-type evaluation usually concentrates on one aspect of the system. This research proposes a systematic evaluation model (SERS) that can …
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Gamma-ray bursts with MeerLICHT
… position of a GRB in the sky and obtain multi-lter follow-up observations of the early phases of the afterglow, when non-standard behaviour may occur. Following the introduction, the thesis consists of four main chapters: a chapter outlining the more than two year GRB follow-up programme …
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Plant Assemblage Structure on Barrier Island ‘Pimple’ Dunes at the Virginia Coast Reserve Long-Term Ecological Research Site
<p>The habitats at the VCR LTER that were the focus of the current study are the Hog Island and Parramore Island 'pimples', small, rounded dunes forming along main dune ridges of the barrier islands. There are distinct plant assemblage zones found on pimples, although most of these dunes are 10–20 …
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