Дисертації з теми "Lake core"
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Manson, K. J. "Aspects of the palaeolimnology of three Norfolk Broads." Thesis, University of East Anglia, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378901.
Повний текст джерелаBridges, K. S. "Deposition processes and their impact on a heavily industrialized region of the northern Czech Republic." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266752.
Повний текст джерелаThapalia, Anita. "Zinc and copper isotopes as tracers of anthropogenic contamination in a sediment core from an urban lake." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
Повний текст джерелаFransner, Oscar. "Sediment variations in the Kuchi Lake, southern Taiwan: : Climate signal or tectonics?" Thesis, Stockholms universitet, Institutionen för geologiska vetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-62193.
Повний текст джерелаKilpatrick, Douglas. "The effects of population growth on Ecosystem services in lake Ekoln : A multi-proxy data analysis of a lake core and historical records." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-128822.
Повний текст джерелаFull surname: Kilpatrick van Houte
Rojas, Rodríguez Clara. "Reconstructing the historic input of mercury in Lake Ekoln : A long-term (millennia) perspective derived from a sediment core." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105160.
Повний текст джерелаLe, Tran Thai. "Mineralogy of Lake Hotagen Sediments: Variations with Grain Size throughout Vertical Profile of a Sediment Core." Thesis, Umeå universitet, Kemiska institutionen, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-160376.
Повний текст джерелаFriedman, Richard M. "Geology and geochronometry of the eocene Tatla Lake metamorphic core complex, western edge of the intermontane belt, British Columbia." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28780.
Повний текст джерелаScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Starr, Lindsay D. "Mercury pollution in an urban and suburban lacustrine system in Summit County, Ohio." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron149434254589456.
Повний текст джерелаFordyce, Nicholas. "Muddy memories : environmental change at Hluhluwe Imfolozi Game Reserve, KwaZulu-Natal, South Africa - evidence from diatoms." Bachelor's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/26382.
Повний текст джерелаYamada, Keitaro. "Reconstruction of high-resolution geological records and development of a method to identify sedimentary disturbance using Quaternary sedimentary cores from Beppu Bay and Lake Suigetsu, Japan." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225413.
Повний текст джерелаLundberg, Robert. "Preliminary Investigation into Quantitation of Pharmaceuticals in Lake Victoria Sediments : Development of a Method for Analysis of 11 Pharmaceuticals." Thesis, Linköpings universitet, Tema Miljöförändring, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-176660.
Повний текст джерелаBalch, Deborah P. "Quaternary Ostracode Paleoecology and Its Link to Climate Change in the Bonneville Basin: A Detailed Study of the Glad800 Core GSL00-4, Great Salt Lake, Utah." Thesis, The University of Arizona, 2003. http://hdl.handle.net/10150/249251.
Повний текст джерелаGunnell, Nathan Vaun. "A Study of the Anthropogenic Impact in Farmington Bay through Isotopic and Elemental Analysis." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/9208.
Повний текст джерелаGura, Colby J. "Characterization of Organisms in Vostok (Antarctica) Glacial, Basal, and Accretion Ice." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1566486484767222.
Повний текст джерелаBaxstrom, Kelli W. "Climate and Vegetation Change in Late Pleistocene Central Appalachia: Evidence fromStalagmites and Lake Cores." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554978401327246.
Повний текст джерелаBerzins, Nicole Kay. "A PRACTICUM PROJECT RESEARCHING THE MICROBIAL COMMUNITY IN SEDIMENT CORES AND THE CURRENT CHEMICAL PARAMETERS OF LAKE QINGHAI, CHINA." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1324745188.
Повний текст джерелаHodelka, Bailee Nicole. "STRATIGRAPHY AND ORGANIC GEOCHEMISTRY REVEAL PATTERNS OF LATE QUATERNARY PALEO-PRODUCTIVITY AT MONO LAKE, CALIFORNIA." UKnowledge, 2018. https://uknowledge.uky.edu/ees_etds/58.
Повний текст джерелаCawley, Jon C. "A Re-Evaluation of Mountain Lake, Giles County, Virginia: Lake Origins, History and Environmental Systems." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/29869.
Повний текст джерелаPh. D.
Grochocki, Julian Lucian. "Late Holocene Environmental Variability as Recorded in the Sediment of a Northeastern Ohio Kettle Lake." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491558782637496.
Повний текст джерелаvan, Blarcum Ronald A. "Anthropogenic Impacts as Revealed from Sediment Cores from Punderson Lake Ohio." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1448536586.
Повний текст джерелаDeRosa, Edith, Lee Clark, and David Parsons. "Late Corn Variety Trial, Greenlee County - 1985." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/200574.
Повний текст джерелаBuck, Michael. "Modelling of the late phase of core degradation in light water reactors." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-33311.
Повний текст джерелаBeierle, Brandon Dennis. "Early Holocene climate of southwestern Alberta, Canada, reconstructed from lake sediment cores." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq20816.pdf.
Повний текст джерелаSalat, Alexandre. "Tracking the History of Alberta Oil Sands Contaminants Using Lake Sediment Cores." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39749.
Повний текст джерелаKekonen, T. (Teija). "Environmental information from the Svalbard ice core for the past 800 years." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514281853.
Повний текст джерелаSatow, Christopher George. "The tephrostratigraphy of three, late quaternary, mediterranean marine cores." Thesis, University of London, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589613.
Повний текст джерелаBuckingham, Heather Marie. "Evolution and late stage deformation of the Himalayan metamorphic core, Kanchenjunga region, eastern Nepal." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51563.
Повний текст джерелаIrving K. Barber School of Arts and Sciences (Okanagan)
Earth and Environmental Sciences, Department of (Okanagan)
Graduate
Stroup, Justin Sirico. "Glacial Lake Ojibway, lacustrine stratigraphy and implications for drainage." Cincinnati, Ohio : University of Cincinnati, 2009. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1243303456.
Повний текст джерелаAdvisor: Thomas V. Lowell. Title from electronic thesis title page (viewed Aug. 18, 2009). Includes abstract. Keywords: Lake Ojibway; lacustrine; 8,200 year event; lake cores; XRF chemistry; stratigraphy; Laurentide; Ice proximal; varves; drainage; Canada. Includes bibliographical references.
Zirker, Kelly Ann Hill. "Intrasentential vs. Intersentential Code Switching in Early and Late Bilinguals." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1885.pdf.
Повний текст джерелаKaspari, Susan. "Late Holocene Asian Climate and Environmental Variability as Inferred from a Mt. Everest Ice Core." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/KaspariS2007.pdf.
Повний текст джерелаVitorino, Tatiana Mendes. "A closer look at brazilwood and its lake pigments." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/10179.
Повний текст джерелаBrazilwood is a soluble redwood that was used as source of organic dye and for lake pigments. It was widely applied in medieval times to colour textiles and in the form of pigment for manuscript illumination and, although it is relatively unstable, it is still found in the 19th oil palette. However, this colorant has received little attention. In this sense, the present work aims to contribute knowledge on the characterisation of brazilwood and its lake pigments. The flavonoid brazilein is the red chromophore that can be extracted from the brazilwood tree. To study with more detail its behaviour, the molecule was isolated from brazilwood scrapes. As confirmed by NMR and HPLC-DAD, a high purity compound was obtained (for which a pKa1 of 7 was determined) and a pure brazilein-Al3+ complex was produced. Characterisation with UV-Vis spectroscopy and μ-spectrofluorimetry revealed that in its acidic form, the chromophore presents absorption, excitation and emission maxima at 446, 475 and 536 nm, respectively, and at 540, 548 and 560 nm when deprotonated. When complexed with Al3+ these values are changed to 510, 520 and 585 nm. Brazilwood lake reconstructions with as much historical accuracy as possible were also prepared based on recipes from the 15th century documentary text Livro de como se fazem as cores and the Winsor & Newton 19th century archive. This led to a greater understanding of the manufacture of the lakes and its evolution through time. Furthermore, in order to investigate the best strategy to characterise such pigments and paints, and to provide reference samples, the lakes produced and applied as temperas were then analysed by colorimetry, FTIR, SEM-EDS, FORS and UV-Vis μ-spectrofluorimetry. Despite some differences exist between the two sources, mainly with respect to the dye extraction method, both are guided by the same principles and are constructed in order that the same final pH, adequate for pigment precipitation, is obtained. In particular, the 15th century Livro de como se fazem as cores, so distant in time, allowed for the successful preparation of brazilwood lake pigments, which can be obtained in a variety of different hues from light pink to dark red and purple. Concerning the analysis carried out, FTIR was essential to characterise extenders, while FORS spectra (λabs 560 nm) and μ-spectrofluorimetry (λex 553 nm for excitation and λem 585-90 nm for emission) data were very consistent and fundamental to identify the brazilwood chromophore. These three techniques were essential and complementary in the characterisation of the paints produced. Medieval reconstructions were compared with pink and red colours of illuminations found in three French books of hours (Palácio Nacional de Mafra, Portugal) from the 15th century. Good correlation between FTIR, FORS and μ-spectrofluorimetry spectra of the reconstructions and historic samples suggest that the illuminations colours were prepared with brazilwood lakes.
Cedillo, Paula. "Hydrodynamic modeling of the Green Bay of Lake Michigan using the environmental fluid dynamics code." Thesis, The University of Wisconsin - Milwaukee, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=1606696.
Повний текст джерелаIn this project we created a hydrodynamic model of the Lower Green Bay of Lake Michigan in Wisconsin, United States using the Visual Environmental Fluid Dynamics Code (EFDC). The model includes four tributary rivers to Lower Green Bay as well as the open boundary flow conditions at Chambers Island. This case study is used to: 1) compare the results obtained with a previous study of Lower Green Bay to validate the creation of the model 2) examine the hydrodynamics of the bay, and 3) create a framework for future studies at Lower Green Bay. The Geographic Information used to build the Grid was obtained from the NOAA web site. Meteorological and flow information was obtained from the National Weather Service and USGS web sites, respectively. It was necessary to create a new model grid as a platform for future studies of Lower Green Bay, and the Visual EFDC 1.2 code was a useful tool in the development of the grid. However, some limitations in the code made the creation of the grid a challenge. In this project, we summarize the process used to overcome challenges in creating a correct grid, and analyze the hydrodynamic results of the model simulation for the period between June and October 2011. Overall, we conclude that the model reproduces field data reasonably well, and a correct modeling framework for hydrodynamic modeling of Lower Green Bay was created.
Reboul, Guillaume. "Metabarcoding and metagenomic approaches to decipher microbial communities in suboxic environments Microbial eukaryotes in the suboxic chemosyn- thetic ecosystem of Movile Cave, Romania Hyper- diverse archaea near life limits at the polyextreme geothermal Dallol area Performance of the melting seawater-ice elution method on the metabarcoding characterization of benthic protist communities Core microbial communities of lacustrine microbialites sampled along an alkalinity gradient Environmental drivers of plankton protist communities along latitudinal and vertical gradients in the oldest and deepest freshwater lake Ancient Adaptive Lateral Gene Transfers in the Symbiotic Opalina-Blastocystis Stramenopile Lineage Marine signature taxa and microbial community stability along latitudinal and vertical gradients in sediments of the deepest freshwater lake." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASL041.
Повний текст джерелаMicrobial ecology is the science of micro-organisms and their biotic and abiotic interactions in a given ecosystem. As technology has advanced, molecular techniques have been widely used to overcome the limitations of classical approaches such as culturing and microscopy. Indeed, the development of Next Generation Sequencing (NGS) technologies in the past twenty years has largely helped to unravel the phylogenetic diversity and functional potential of microbial communities across ecosystems.Nonetheless, most of the environments studied through these techniques concentrated on relatively easily accessible, tractable and host-related ecosystems such as plankton (especially in marine ecosystems), soils and gut microbiomes. This has contributed to the rapid accumulation of a wealth of environmental diversity and metagenomic data along with advances in bioinformatics leading to the development of myriads of tools. Oxygen-depleted environments and especially their microbial eukaryote components are less studied and may lead to future phylogenetic and metabolic discoveries.In order to address this, we conducted analyses on two poorly studied suboxic ecosystems: Movile Cave (Romania) and lake Baikal sediments (Siberia, Russia). In this task, we aimed at unveiling the taxonomic and functional diversity of microorganims in these environments.To do so, I first evaluated the available bioinformatics tools and implemented a bioinformatics pipeline for 16S/18S rRNA gene-based metabarcoding analysis, making reasoned methodological choices. Then, as a case study, I carried out metabarcoding analyses of the water and floating microbial mats found in Movile Cave in order to investigate its protist diversity. Our study showed that Movile Cave, a sealed off chemosynthetic ecosystem, harbored a substantial protist diversity with species spanning most of the major eukaryotic super groups. The majority if these protists were related to species of freshwater and marine origins. Most of them were putatively anaerobic, in line with the cave environment, and suggesting that in addition to their predatory role, they might participate in prokaryote-protist symbioses.In a second study, I applied my metabarcoding pipeline to explore unique and relatively unexplored environment of Lake Baikal sediments. I first applied a metabarcoding approach using 16S and 18S rRNA genes to describe prokaryotic as well as protist diversity. Overall, the communities within these ecosystems were very diverse and enriched in ammonia-oxidizing Thaumarchaeota. We also identified several typical marine taxa which are likely planktonic but accumulate in sediments. Finally, our sampling plan allowed us to test whether differences across depth, basin or latitude affected microbial community structure. Our results showed that the composition of sediment microbial communities remained relatively stable across the samples regardless of depth or latitude.In a third study, we applied metagenomics to study the metabolic potential of communities associated to Baikal sediments and to reconstruct metagenome-assembled genomes (MAGs) of dominant organisms. This revealed the considerable ecological importance of Thaumarchaeota lineages in lake Baikal sediments, which were found to be the major autotrophic phyla and also very implicated in the nitrogen cycle. Chloroflexi and Proteobacteria-related species also appeared ecologically important.This PhD thesis reveals the taxonomic diversity of poorly studied suboxic ecosystems and therefore contributes to our knowledge of microbial diversity on Earth. Additionally, the analyses of surface sediment samples in lake Baikal adds new light on freshwater-marine transitions. The metagenomic analyses reported here allowed us to postulate a model of nutrient cycle carried out by microorganismsin these sediments. Overall, this work sheds light on the microbial ecology of oxygen-depleted environments, and most notably lake Baikal surface sediments
Buck, Michael [Verfasser]. "Modelling of the late phase of core degradation in light water reactors / vorgelegt von Michael Buck." Stuttgart : IKE, 2007. http://d-nb.info/997050047/34.
Повний текст джерелаDíaz, Viviana Díaz. "Late cretaceous SR isotopic and sequence stratigraphy of the Dixon Core, Outer Coastal Plain, North Carolina." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-1/rp/diazv/vivianadiaz.pdf.
Повний текст джерелаClaypoole, Micah N. "Mineral Ridge| A Late Cretaceous Orogenic Gold System in the Miocene Silver Peak-Lone Mountain Metamorphic Core Complex." Thesis, University of Nevada, Reno, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10821834.
Повний текст джерелаGold deposits in rocks of the Silver Peak metamorphic core complex in west-central Nevada are contained in highly deformed, sheeted milky quartz veins that cut Neoproterozoic metasedimentary rocks and Cretaceous peraluminous granite and migmatite. Gold production at Mineral Ridge since discovery in 1864 has been approximately 1 million oz. Gold-bearing veins are concentrated in a major low-angle ductile shear system active during the Late Cretaceous. However, a broadly coincident brittle detachment cuts the ductile shear, separating metasedimentary and foliated granitic rocks from overlying non-metamorphosed Cambrian carbonates and Cenozoic volcanics. The Mineral Ridge biotite-muscovite granite pluton bounds the ductile shear along its roof, defining a wedge of prospective metamorphic rocks generally <50-m-thick. Zones of intense shearing generally correspond to highest vein density and therefore, gold grades, and such zones are overprinted with strong but narrowly defined quartz-sericite-pyrite-carbonate alteration. Vein boudins are subparallel to the strong planar to anastomosing shear fabric best developed over 1-10 meter thicknesses at contacts between muscovite schist and/or marble, and foliated granite. Goldbearing veins contain Au:Ag of ≥4, zoned base metals, low As, Sb, and Hg, but high Bi, the latter correlating with gold.
Vein-bearing granites at Mineral Ridge yield U/Pb zircon ages of 91.7+/-0.3 Ma and 89.9+/-0.5 Ma and likely derive from crustal melts during peak metamorphism. Hydrothermal monazite in goldbearing quartz veins yielded a U/Pb age of 76.0+/-1.8 Ma, indicating veins are unrelated to granites and formed during retrograde greenschist conditions. Previous cooling ages on mica in granites of ∼42 and 53 Ma further define the cooling path to ∼300°C. Mineral Ridge is interpreted as an orogenic gold system associated with a brittle-ductile shear that formed at depths as much as 11-20 km during the waning stages of Late Cretaceous Sevier contraction. Major exhumation occurred in the late Miocene in association with detachment and transtension in the Walker Lane deformation belt.
Cakiroglu, Ayse Idil. "Salinity Inference In Inland Turkish Shallow Lakes On Paleoecology Using Sub-fossil Cladocera." Phd thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615450/index.pdf.
Повний текст джерелаKirchgeorg, Torben [Verfasser], and Ralf [Akademischer Betreuer] Ebinghaus. "Specific Molecular Markers in Lake Sediment Cores for Biomass Burning Reconstruction during the Holocene / Torben Kirchgeorg. Betreuer: Ralf Ebinghaus." Lüneburg : Universitätsbibliothek der Leuphana Universität Lüneburg, 2015. http://d-nb.info/1077913729/34.
Повний текст джерелаNeil, Karen. "Ecosystem Responses to Holocene Climate Variability Through the Analysis of High-resolution Lake Sediment Cores from Southwestern Québec, Canada." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38120.
Повний текст джерелаFoulds, Chantal M. (Chantal Marguerite). "Field testing of five legume forages as interseedings in early and late cole crops." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59942.
Повний текст джерелаA dry year coupled with difficulties in applying the treatments resulted in low forage biomass. Hairy vetch yielded the most within the early broccoli planting system. High rainfall the next year resulted in high biomass yields. Over the two year study, hairy vetch and crimson clover emerged as the two most productive species. Significant effects on fall weed biomass were observed with broccoli in the second year of the study, where interseeded plots reduced weed populations by at least 66%. No evidence was seen of weed suppression by interseedings prior to harvest. Crop yields were not affected by interseedings. All interseeded treatments provided the minimum of 30% ground cover required to help reduce erosion.
Almeida, André Filipe de Oliveira. "Comportamento de lajes alveoladas sujeitas a cargas pontuais – análise numérica da distribuição de esforços." Master's thesis, FCT - UNL, 2009. http://hdl.handle.net/10362/3615.
Повний текст джерелаEsta dissertação tem como objectivo aprofundar o conhecimento sobre o comportamento de lajes alveolares sujeitas a cargas concentradas e a forma como o esforço transverso se distribui pelas nervuras. Para o efeito, utilizaram-se modelos numéricos com elementos finitos de sólido para caracterizar as propriedades mecânicas destes elementos. Conhecendo estas grandezas, modelaram-se painéis de laje alveolar em elementos finitos de laje que foram submetidos a diversas situações de carga, nos quais se fizeram variar as dimensões do vão dos painéis de laje, o número de painéis justapostos e o tipo painel de laje alveolar. Com a análise dos resultados destes procedimentos, tiraram-se conclusões quanto à influência da variação de cada um dos parâmetros acima enumerados na distribuição do esforço transverso pelas nervuras, assim como a contribuição da fendilhação longitudinal nas juntas entre painéis e no alvéolo adjacente à secção carregada, na distribuição de esforços. Para concluir, será apresentada uma proposta para calcular o esforço transverso actuante máximo para que, comparando com o esforço transverso resistente, possa ser verificada a segurança das lajes alveolares ao punçoamento.
Camillo, Carolina Alvares. "Continuidade de painéis de laje alveolar em edifícios." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/4679.
Повний текст джерелаThe floors consist of hollow core slabs are being increasingly used in Brazil, because it can overcome large spans, have a low self-weight, allow fast assembly, require no shoring in many situations and are more economical than other solutions. These floors are normally designed for ease of implementation, so that the slabs act as simply supported, without continuity. This work presents a roadmap of calculation and verification based on known theoretical models and tests already carried out considering that the hollow core slabs of pavement work as continuous. This continuity is made by adding passive reinforcement in the topping region. The calculation procedures are also detailed for the situations in which there are alternate accidental actions, as well as the situation in which there are concentrated mobile loads acting on the floor. Numerical examples comparative considering continuity with the situation simply supported show what can be achieved: the active reinforcement economy, increasing the value of accidental load and checks excessive deformation that is not checked on a system simply supported. Some situations are also pointed in which the consideration of continuity fails to bring great advantage. In all the examples developed are shown the details required to perform continuity. Every calculation methodology is based on Brazilian codes and should be noted that the calculations are done considering the simultaneous loss of prestressing. At the end of the work are proposed studies that may be performed to improve understanding of the behavior of pavements with continuous hollow core slabs.
Os pavimentos formados por laje alveolar estão sendo cada vez mais utilizados no Brasil, porque podem vencer grandes vãos, ter um baixo peso próprio, permitirem rapidez de montagem, não necessitam de escoramento e em diversas situações são mais econômicos do que outras soluções. Tais pavimentos são normalmente projetados, por facilidade de execução, para que as lajes funcionem como simplesmente apoiadas, sem continuidade. Apresenta-se neste trabalho um roteiro de cálculo e verificações baseados em modelos teóricos conhecidos e ensaios já realizados considerando que as lajes alveolares do pavimento funcionam como contínuas. Esta continuidade é feita através da adição de armadura passiva na capa das lajes. Detalham-se os procedimentos de cálculo também para as situações em que existem ações acidentais alternadas, assim como para a situação em que há cargas concentradas móveis atuantes no pavimento. Exemplos numéricos comparativos considerando a continuidade com a situação simplesmente apoiada mostram, que é possível alcançar: economia na armadura longitudinal ativa, aumento do valor de carga acidental atuante e atender verificações de deformação excessiva, não atendidas em um sistema simplesmente apoiado. Aponta-se também em quais situações a consideração da continuidade não chega a trazer grande vantagem. Em todos os exemplos desenvolvidos são mostrados os detalhes necessários para executar a continuidade. Toda a metodologia de cálculo é baseada nas instruções das normas Brasileiras e salienta-se que os cálculos são feitos considerando-se as perdas de protensão simultâneas. No final do trabalho são propostos estudos que podem ser realizados para melhorar o entendimento do comportamento de pavimentos contínuos com lajes alveolares.
Hoare, Mary-Jo. "A comparison of the pollution record of South Merseyside from sediment cores taken from the estuary and a small lake." Thesis, University of Liverpool, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569449.
Повний текст джерелаSusser, Jessica R. "Can we reduce phosphorus runoff into Lake Erie by stimulating soil biota?" University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1515756009087471.
Повний текст джерелаRåhlander, Moa. "How Beads come Together : Late Iron Age glass beads as past possessions and present sources." Thesis, Stockholms universitet, Institutionen för arkeologi och antikens kultur, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-185146.
Повний текст джерелаKing, Leighton R. "The Response of Utah Lake's Plant and Algal Community Structure to Cultural Eutrophication." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7631.
Повний текст джерелаSchultz, Lynn L. "Agricultural Land Use, Watershed Characteristics, and Hydrological Forces Contributing to the Impairment of a Shallow Lake in the Western Corn Belt Ecoregion." Thesis, Minnesota State University, Mankato, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10254675.
Повний текст джерелаThe Lake Titlow watershed (approximately 35,000 acres) in south-central Minnesota is part of the Minnesota River Basin. The lake is listed in the draft 2010 Clean Water Act Section 303d for nutrient pollution, eutrophication, and biological indicators for impairment of aquatic life and recreational use. Over 90 percent of pre-settlement wetlands are currently drained for agricultural land use. The Lake Titlow watershed is over 80 percent row crops and land use is implicated as a primary cause of impairment in the lake.
Water samples were collected from the Lake Titlow tributaries McLeod-Sibley Judicial Ditch Number 18 (JD18), Sibley County Ditch Number 18 (CD18), and Ditch 250 (D250) during 2009 and 2010 and were analyzed for total suspended solids (TSS), total phosphorus (TP), and nitrate-nitrite nitrogen (NOx). Investigative methods included continuous recording stream stage and through the use of rating curves, discharge. Runoff, sediment loads, and nutrient loads were then determined from the field data. Four rain gauges collected precipitation each year and were used to assess the impact of precipitation on runoff and loading. Four characteristic precipitation events were selected for each of the calendar years 2009 and 2010 to estimate the loads of sediment and nutrients to the lake and more fully understand the specific roles that land use, hydrologic soil group, slope, and precipitation play with regard to causing sediment and nutrient loading in the lake.
Results indicate runoff and loads are significant and highly variable by position within the watershed, areas referred to herein as subsheds. The row crop land use, soils characteristics, and precipitation do contribute to overall runoff and loads; however, they do not control subshed variability. Although the low-sloping land surfaces of the watershed should not contribute to overall runoff and loads, results indicate that subtle slope changes in the JD18Lo and CD18Lo subsheds could contribute to the variability of loads seen in these portions of the watershed.
The location and type of best management practices to implement is debatable because the results of this study indicate that large runoffs and loads could originate within any given subshed during any given rainstorm event. This study was unable to precisely identify the root cause of the variability in subshed runoff and loading. Therefore, it is suggested to look at other factors (e.g., antecedent soil moisture, rainfall intensity, mass wasting, etc.) to explain the subshed variability in the sediment and nutrient loading in future studies of this lakeshed.
Sunderlage, Brent. "LATE APPLICATION NITROGEN ON CORN IN SOUTHERN ILLINOIS AND SOIL PROPERTIES AFFECTING AMMONIA VOLATILIZATION FROM UREA FERTILIZER." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2154.
Повний текст джерелаMarambe, Kodippili Arachchilage Yahampath Anuruddha Marambe. "Monitoring Crop Evapotranspiration in the Western Lake Erie Basin Using Optical Sensors." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1535362877977252.
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