Rozprawy doktorskie na temat „Sediments”
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 50 najlepszych rozpraw doktorskich naukowych na temat „Sediments”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj rozprawy doktorskie z różnych dziedzin i twórz odpowiednie bibliografie.
Sherwood, Christopher R. "Measurements and modeling of suspended-sediment transport on the northern California continental shelf /". Thesis, Connect to this title online; UW restricted, 1995. http://hdl.handle.net/1773/11014.
Pełny tekst źródłaAbdullayev, Elshan. "Reconstruction of provenance and climatic conditions in the source areas based on fine-grained sediments from the Pliocene Productive Sereis, western South Caspian Basin". Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-160022.
Pełny tekst źródłaGodoi, Ana Carolina. "Remineralização da matéria orgânica sedimentar em resposta à simulação de processos oceanográficos". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/21/21134/tde-09042014-174007/.
Pełny tekst źródłaMarine sediments are the final receivers of many organic compounds from the water column, playing an important role in biogeochemical cycles. Microbial communities are important to these cycles as they remineralize organic matter within surface sediments. Microcosm experiments were conducted to simulate two important oceanographic processes: Organic Enrichment, to test differences between sinking patterns of phytoflagellates and diatoms and Resuspension, simulating the passage of a cold front. The quality and amount of the organic matter was assessed, as well as the nutrient flow between the sediment-water interface. In the Enrichment Experiment, distinctive responses in the degradation processes were noted between treatments where the addition of phytoflagellates increased the quality of the organic matter, caused faster metabolism communities present in the sediment, and modify the patterns of nutrient flux rates. In the Resuspension Experiment, the physical disturbance caused an immediate and significant release of nutrients from the sediment to the sediment-water interface and changed the in the concentrations of fatty acid content most notably during two days after the resuspension event. Thus, the different simulated oceanographic events influenced biogeochemical processes, particularly in the availability of fatty acids and the release of nutrients to the overlying water
Sell, Karen S. "Temporal influences of seasonal hypoxia on sediment biogeochemistry in coastal sediments". Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1142.
Pełny tekst źródłaFilho, Ricardo Wagner Reis. "Avaliação ecotoxicológica do sedimento da Represa do Lobo (SP), em mesocosmos submetidos aos metais cobre e cromo". Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-08082016-104419/.
Pełny tekst źródłaIn-situ mesocosms experiments allow the extrapolation of laboratory data to the field with high reliability. In the present study, nine hexagonal PVC mesocosms with 2 m height and 4.5 to 5.1 m3 volume were installed in contact with the sediment near the Lobo reservoir dam (22º15\'S e 47º49\'W) in february of 2002. In accordance with the National Environmental Council (CONAMA) 20/86 resolution for Class 2 water bodies, the maximum allowed concentrations of copper (0,02 mg/L) and chromium (0,5 mg/L) were added to the mesocosms (triplicate), and three other ones were used as controls. The main purpose of this study was to evaluate the possible changes in the sediment environment, particularly the enrichment and induction of toxicity, by the contamination of these metals. The sediment was sampled by means of Eckman-Birge and core samplers on the 0 (before the contamination), 10th, 20th and 30th days (end of the experiment). Afterwards, physical and chemical analyses, benthic macrofauna characterization and several toxicity assays were conducted with the samples. In order to better evaluate these results, the sediments quality triad was considered. A discrete increase in the total concentration of copper and chromium was observed in the sediments of the contaminated mesocosms when compared to the controls, as well as a reduction in the abundance of benthic organisms and toxic effects over the organisms tested with these sediments. The triad responses were essential for quality characterization of the control mesocosms sediments in comparison with the contaminated ones.
Bornemann, André, Thomas C. Brachert i Werner Ehrmann. "SEDIMENT 2011 Sediments: Archives of the Earth System: SEDIMENT 2011Sediments: Archives of the Earth System". ?, 2011. https://ul.qucosa.de/id/qucosa%3A11218.
Pełny tekst źródłaSuedel, Burton C. (Burton Craig). "Sediment Characteristics and Bioavailability of Sorbed Neutral Organic Compounds". Thesis, University of North Texas, 1989. https://digital.library.unt.edu/ark:/67531/metadc500652/.
Pełny tekst źródłaPiqué, Altés Gemma. "Analysis of hydro-sedimentary processes and impacts affecting river basins and channels". Doctoral thesis, Universitat de Lleida, 2017. http://hdl.handle.net/10803/405448.
Pełny tekst źródłaEsta tesis estudia la dinámica hidro-sedimentaria de ríos mediterráneos, tanto ‘naturales’ como regulados por presas. Con este objetivo, se ha realizado un estudio a escala multi-temporal y multi-espacial, que incluye trabajo de campo en tramos de río representativos, análisis de datos a nivel de cuenca, y experimentos en canales de laboratorio. La alteración hidrológica aguas abajo de los embalses se ha observado a diferentes escalas temporales, afectando notablemente la magnitud y frecuencia de las crecidas. A nivel sedimentario, se observa un déficit de sedimentos, lo que facilita el establecimiento de biofilm y, a la vez, favorece la estabilización del lecho del río. Además, el almacenamiento temporal de sedimentos en el lecho modula el balance y regula la entrada de sedimentos en embalses. La tesis muestra los efectos de un conjunto de actividades antrópicas en procesos fluviales y en la alteración en las interacciones bio-físicas del río, y enfatiza la necesidad de una gestión continua para la preservación de los ecosistemas fluviales.
This PhD thesis studies hydro-sedimentary dynamics in Mediterranean rivers, both in ‘natural’ and in dammed rivers. For this purpose, a multi-temporal and spatial research was carried out, including field measurements in representative river reaches, data analysis at the basin scale, and experiments in artificial streams. The hydrological alteration downstream from dams was documented at different temporal scales, notably affecting the magnitude and frequency of floods. Regarding sediments, a severe deficit was observed below dams, a fact that facilitates the establishment of biofilm which, in turn, favours river bed stabilisation. Moreover, the study shows how in-channel storage influences the river sediment budget and regulates sediment input in reservoirs. The thesis examines the effects of a suit of human activities on fluvial processes and how this alter rivers’ bio-physical interactions, and emphasises the need of continuous monitoring of all these processes to achieve a sound management of fluvial ecosystems.
Denys, Frank. "Transverse transport of suspended sediment across the main channel - floodplain shear boundary /". Link to the online version, 2007. http://hdl.handle.net/10019/415.
Pełny tekst źródłaBattisto, Grace M. "Field Measurement of Mixed Grain Size Suspension in the Nearshore Under Waves". W&M ScholarWorks, 2000. http://web.vims.edu/library/Theses/Battisto00.pdf.
Pełny tekst źródłaRavisangar, Vasuthevan. "The role of sediment chemistry in stability and resuspension characteristics of cohesive sediments". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/20722.
Pełny tekst źródłaOlli, Gull. "Waterborne sediment and pollutant transport into lakes and accumulation in lake sediments /". Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8302.
Pełny tekst źródłaBramorski, Julieta. "Avaliação da perda de solo e fertilizantes nitrogenados por erosão em áreas agrícolas: uma abordagem integrada e experimental dos fatores intervenientes no processo". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-07012016-142227/.
Pełny tekst źródłaSoil erosion has been extensively studied from the agricultural point of view, because it is related with serious damages in terms of a huge variety of plantations productivity and its consequent economic detriments. Currently, special attention is given to the environmental problems caused by erosion processes and the transport and deposition of the sediments, since they are, probably, the most significant pollutants in terms of its concentration in the water and its impacts and effects in the chemical substances transport, such as nitrogen which is applied in the form of fertilizer. The central focus of the present work was the research of the standards sediment transport origined by the water erosion and their influences in the transference of nitrogen to the water bodies. The evaluated nitrogen source was the ammonium sulphate applied superficially as a fertilizer in a latossolo vermelho amarelo soil, under different soil tillage systems, without vegetal covering and under different intensities of simulated rain. The results allowed to identified that the argillaceous fraction of the eroded sediments carried in the runoff suspension was the main way of the nitrogen transport/transference derived from the fertilizer. This transference process was more intensely observed in the first rains. It was evidenced too, that the losses values of soil and water did not influence the nitrogen transport capacity between the planted areas and the water bodies. Aditionally, soil tillage influenced in nitrogen concentrations carried by the runoff. The nitrogen concentrations in the sediments were high, in spite of the low volumes and low intensities of the rain.
Guerra, Josefa Varela. "Interannual variability of nearbed sediment flux and associated physical processes on the Eel River shelf, Northern California, USA /". Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/11000.
Pełny tekst źródłaFrings, Roy. "From gravel to sand : downstream fining of bed sediments in the lower river Rhine /". Utrecht : Koninklijk Nederlands Aardrijkskundig Genootschap, Faculteit Geowetenschappen, Universiteit Utrecht, 2007. http://www.loc.gov/catdir/toc/fy0804/2008400397.html.
Pełny tekst źródłaPalinkas, Cynthia. "Temporal and spatial patterns of modern shelf sedimentation in the Adriatic Sea /". Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/10986.
Pełny tekst źródłaRidenoure, Brian D. "Evaluation and enhancement of the effectiveness of sediment trapping and retention devices installed on the Nevada side of Lake Tahoe /". abstract and full text PDF (UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1451078.
Pełny tekst źródła"December 2007." Includes bibliographical references (leaves 122-124). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2008]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
Faries, Joseph W. C. "A new conductivity sediment concentration profiler (CCP) for the measurement of nearbed sediment concentrations application in the swash zone on a laboratory beach /". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 150 p, 2009. http://proquest.umi.com/pqdweb?did=1889078541&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Pełny tekst źródłaMullenbach, Beth Lee. "Characterization of modern off-shelf sediment export on the Eel margin, Northern California /". Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/10969.
Pełny tekst źródłaKhalid, M. (Muhammad). "Erosion of organic sediments and modelling of sediment transport in peat drainage area". Master's thesis, University of Oulu, 2015. http://urn.fi/URN:NBN:fi:oulu-201502131085.
Pełny tekst źródłaHimmelheber, David Whims. "In situ capping of contaminated sediments". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/28128.
Pełny tekst źródłaCommittee Co-Chair: Joseph B. Hughes; Committee Co-Chair: Kurt D. Pennell; Committee Member: Danny D. Reible; Committee Member: Frank E. Loeffler; Committee Member: Jim C. Spain; Committee Member: Martial Taillefert; Committee Member: Terry W. Sturm.
Loureiro, Diego Dozzi Tezza. "Métodos atuais e novas tecnologias para o monitoramento do transporte de sedimentos em rios: necessidade de dados e incertezas envolvidas". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-17112008-140830/.
Pełny tekst źródłaThe knowledge of the processes involving the transport, deposition and suspension of sediment in rivers is of vital importance in the conservation, development and utilization of water resources and the environment. Meanwhile, in Brazil, which has based the hydropower energy, has not given proper consideration with regard to sedimentation due to the difficulty in acquiring such data and costs involved. So this research aimed to define the needs on the accuracy, ease, cost and frequency of data acquisition for the supply of sediment in rivers, identifying current technologies and promising technologies that will be available on short notice to meet those needs.
Travers, Sarah. "Toxicity of Lake Sediments". Thesis, Ulster University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487669.
Pełny tekst źródłaDanielsson, Åsa. "Spatial modeling in sediments /". Linköping : Tema , Univ, 1998. http://www.bibl.liu.se/liupubl/disp/disp98/arts178s.htm.
Pełny tekst źródłaCha, Minsu. "Mineral dissolution in sediments". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50144.
Pełny tekst źródłaJames, Duncan Stuart. "Acoustics of cohesive sediments". Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323344.
Pełny tekst źródłaPartridge, Susan Jill. "Rheology of cohesive sediments". Thesis, University of Bristol, 1985. http://hdl.handle.net/1983/f3294ccc-c8af-42f9-858b-4ab7e0c89042.
Pełny tekst źródłaQI, SHUANG. "PCB VOLATILIZATION FROM SEDIMENTS". University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1046964839.
Pełny tekst źródłaJohansson, June. "Sediment chemistry and the potential toxicity to benthic invertebrates in sediments affected by acid sulfate soils : A study on freshwater and marine sediments in Västerbotten, Sweden". Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172323.
Pełny tekst źródłaBuffington, John M. "The use of streambed texture to interpret physical and biological conditions at watershed, reach, and subreach scales /". Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/6700.
Pełny tekst źródłaJones, Katie Elizabeth. "Contemporary sediment delivery ratios for small catchments subject to shallow rainfall triggered earthflows in the Waipaoa catchment, North Island, New Zealand : a thesis submitted to the Victoria University of Wellington as partial fulfilment of the requirements for the degree of Master of Science with Honours in Physical Geography /". ResearchArchive@Victoria e-thesis, 2009. http://hdl.handle.net/10063/1197.
Pełny tekst źródłaLubarsky, Helen V. "The impact of microbial extracellular polymeric substances on sediment stability". Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2099.
Pełny tekst źródłaLindsay, Michelle Dawn. "Animal-sediment interactions : macrofauna community structure and sediments of an intertidal mudflat, Southampton Water, UK". Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402235.
Pełny tekst źródłaMichael, Taylor. "Invertebrate Activities in Wetland Sediments Influence Oxygen and Nutrient Dynamics at the Sediment-water Interface". Kent State University Honors College / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1525568331200468.
Pełny tekst źródłaFranz, Claudia. "Sediments in a fast urbanizing catchment in Central Brazil – an analysis of anthropogenic impacts on sediment geochemistry and sediment sources". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-171959.
Pełny tekst źródłaIm Gebiet des Bundesdistrikts Brasilien ist ein erheblicher Druck auf die Wasserressourcen zu beobachten, der vorwiegend durch starkes Bevölkerungswachstum, ungeplante Suburbanisierung und Landnutzungsänderungen innerhalb der letzten Jahrzehnte ausgeübt wird. Die Wasserversorgung der jungen Hauptstadt Brasília und seiner suburbanen Räume wird im Wesentlichen durch in Stauseen gesammeltes Oberflächenwasser gewährleistet. Durch die voranschreitende Ausdehnung von urbanen und landwirtschaftlichen Flächen spielen insbesondere Sedimenteinträge in die Stauanlagen sowie sedimentgebundene Stoffbelastungen durch anthropogene Aktivitäten für die verfügbare Wasserquantität und Wasserqualität eine bedeutende Rolle. Damit verbundene negative Umweltauswirkungen sowie die daraus resultierenden sozioökonomische Konsequenzen erfordern daher dringend wirksame und nachhaltige Strategien im Land-und Wasserressourcenmanagement. Eine deutliche Minimierung der Sedimenteinträge und Stoffbelastungen in das Gewässernetz ist jedoch nur mit Kenntnis der Primärquellen von Sedimenten und der Sedimentgeochemie zu erreichen. Der "Fingerprinting"-Ansatz und der Einsatz eines "Multivariate Mixing-Modell", sind geeignete Werkzeuge um den Einfluss anthropogener Eingriffe in das landschaftsökologische Prozessgefüge der Sedimentgenerierung zu klären. Die vorliegende kumulative Dissertation zeigt dies anhand der Anwendung einer Multikomponenten-Methodik. Diese beinhaltet sowohl geochemische und geophysikalische Analysen repräsentativer Sedimentproben der Sedimentquellen und der finalen Senken (Auenbereiche und Bereiche der Zuflüsse zum Lago Paranoá) als auch umfassende statistische Analysen sowie die Anwendung eines modifizierten "Multivariate Mixing-Modells". Der Einsatzder "Fingerprinting" Methodik in urbanen Einzugsgebieten der wechselfeuchten Tropen, wie das des Lago Paranoá in Zentralbrasilien, ist jedoch mit erheblichen Herausforderungen verbunden. Das betrifft insbesondere die Heterogenität der Landnutzungstypen innerhalb einer Landnutzungsklasse (urban, landwirtschaftlich, semi-natürlich) und die Unterschiede der Landnutzungsanteile zwischen den einzelnen Teileinzugsgebieten als auch modelstruktureller Unzulänglichkeiten bei der Sedimentherkunftsberechnung für urbane Einzugsgebiete. Eine Hauptkomponentenanalyse und hierarchische Clusteranalyse wurden verwendet, um den Einfluss der verschiedenen Landnutzungstypen auf der Geochemie der Sedimente zu untersuchen. Geochemische Fingerprints verschiedener anthropogener Aktivitäten wurden auf der Grundlage der Ergebnisse der Clusteranalyse ("grouping") entwickelt. Die Berechnung von Anreicherungsfaktoren ("Enrichmentfactors") auf Basis der gemessenen Elementgehalte, mit dem lokalen geologischen Hintergrundwerten als Referenz, ermöglichte die Quantifizierung des Einflusses der verschiedenen Landnutzungen auf die Metalleinträge in die Sedimente. Die vorhandenen Ergebnisse legen nahe, dass eine direkte Beziehung zwischen Landnutzung und quantifizierbarer Merkmale der Sedimentgeochemie existiert. Ein Vergleich der geochemischen Signatur von potentiellen Sedimentquellen und mit jenen der alluvialen Sedimente unterstützt die Hypothese, dass urbane Gebiete einen beachtlichen Beitrag zur Sedimentgenerierung und letztendlich zur Sedimentablagerung in den Auen- und Zuflussbereichen des Lago Paranoá leisten. Da diese relative Betrachtung von Elementzusammensetzungen der Sedimente keine quantitativen Aussagen zur Bedeutung der einzelnen Sedimentquellen zulässt, wurden statistisch verifizierte "composite fingerprints" und ein an urbane Bedingungen modifiziertes multivariate mixing-Modell (Hybrid) entwickelt und angewendet. Die Modellberechnungen erfolgten für das gesamte Einzugsgebiet des Lago Paranoá und separat für das Riacho Fundo Teileinzugsgebiet, welches Die angepassten Modellschätzungen zeigten, dass die in den Verlandungszonen des Lago Paranoá abgelagerten Sedimente weitgehend aus urbane Räumen (85 ± 4%) generiert wurden. Dahingegen stammen nur 10 ± 2% der Sedimente aus Gebieten mit (semi-) natürlicher Vegetation, obwohl 58 % der gesamten Einzugsgebietsfläche des Lago Paranoá stets (semi-) natürliche Verhältnisse aufweist. Landwirtschaftliche Gebiete haben generell nur einen geringen Anteil von etwa 5 ± 4% am Sedimenteintrag. Die Unterschiede in den Sedimentbeträgen sowohl zwischen den verschiedenen Sedimentquelltypen als auch zwischen den einzelnen Teileinzugsgebieten scheinen maßgeblich von den Flächennutzungsanteilen (urban, landwirtschaftlich, semi-natürlich) in dem jeweiligen Teileinzugsgebiet abhängig zu sein. Trotz umfassender Probennahme, Probenanalytik, Modellanpassung und Unsicherheitsanalyse sind die Ergebnisse nur für den Beprobungszeitraum, für die analysierte Stoffgruppe (organische Stoffeinträge sind im Rahmen dieser Dissertation nicht erfasst) und für die ausgewählten Lokalitäten repräsentativ. Zeitliche Einflussgrößen wie die Saisonalität in den Tropen oder Änderungen der Landnutzung, wie z.B. temporäre Baustellen, konnten mit den hier verwendeten Methoden nicht erfasst werden. Um die hohe räumliche und zeitliche Variabilität der Sedimentdynamik und eine deutliche Minimierung der Sedimenteinträge in das Gewässernetz zu erzielen, sind demnach die Einrichtung und der Betrieb eines langfristigen Monitoring-Netzwerkes für Sedimente im Einzugsgebiet des Lago Paranoá von hoher Priorität. Die vorliegende Dissertation bringt neue Einsichten in verschiedene wichtige Aspekte der geochemischen Beeinflussung von Sedimenten durch anthropogene Aktivitäten und liefert erstmalig quantitative Aussagen zu den Sedimentquellgebieten im Einzugsgebiet des Lago Paranoá. Sie stellt regionsspezifische Herausforderungen heraus, liefert gleichzeitig aber auch wichtige Informationen zu Sedimentbelastungen und -Einträgen und damit einen wichtigen Beitrag als Entscheidungsunterstützung im Rahmen eines Sedimentmanagementplans
Sajner, Pavel. "Hydrodynamická separace sedimentu vodního toku". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228371.
Pełny tekst źródłaMartin, Ana Isabel. "Hydrate Bearing Sediments-Thermal Conductivity". Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6844.
Pełny tekst źródłaKjærås, Halvor. "Sediments in Angostura Hydropower Reservoir". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for vann- og miljøteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19298.
Pełny tekst źródłaAnderson, Stephen. "Differential compaction in alluvial sediments". Thesis, Cardiff University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.536314.
Pełny tekst źródłaMarshall, William Alderman. "Geochronology of salt-marsh sediments". Thesis, University of Plymouth, 2007. http://hdl.handle.net/10026.1/2826.
Pełny tekst źródłaPrastka, Katherine. "Phosphorus cycling in intertidal sediments". Thesis, University of East Anglia, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320776.
Pełny tekst źródłaOsborne, Peter John. "Azaarenes in some Merseyside sediments". Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260309.
Pełny tekst źródłaBasaham, Ali Said. "Elemental partitioning in marine sediments". Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329422.
Pełny tekst źródłaHiggo, J. J. W. "Radionuclide sorption by marine sediments". Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37725.
Pełny tekst źródłaGray, Andrew. "The geomicrobiology of subglacial sediments". Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15237/.
Pełny tekst źródłaBrain, Matthew James. "Autocompaction of mineralogenic intertidal sediments". Thesis, Durham University, 2006. http://etheses.dur.ac.uk/1824/.
Pełny tekst źródłaKelly, David C. "Dimethylmercury Production in Freshwater Sediments". Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1292547695.
Pełny tekst źródłaSidik, Madihah Binti Jafar. "Optical measurements of suspended sediments". Thesis, Bangor University, 2016. https://research.bangor.ac.uk/portal/en/theses/optical-measurements-of-suspended-sediments(e93593ab-41cf-4039-ac87-2fdcffd15a10).html.
Pełny tekst źródłaRothe, Matthias. "Exploring vivianite in freshwater sediments". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17543.
Pełny tekst źródłaIn this thesis, the occurrence and environmental relevance of vivianite in freshwater sediments were explored. Vivianite is the most common reduced iron phosphate mineral which forms in sedimentary environments. Not much is known about the mechanisms which lead to vivianite formation in surface sediments, and about the quantitative role of vivianite in phosphorus sequestration. The development of a novel sediment preparation technique allowed the direct identification of vivianite by powder X-ray diffraction. Notably, for the first time, vivianite was quantified in surface freshwater sediments. The study examplifies that vivianite can significantly contribute to the phosphorus retention in surface freshwater sediments, accounting for 10-40 % of total sedimentary phosphorus. The exploration of vivianite in different surface freshwater sediments located in northern Germany revealed that the sedimentary sulphur to iron ratio is a valuable indicator for the conditions that are important drivers behind the formation or absence of vivianite. It has been demonstrated that eutrophication and the accompanied increase in sulphide production hampers vivianite formation, leading to a decreased phosphorus binding capacity of sediments through increased sediment sulphidization. The present study also revealed, that an iron addition as a measure of lake restoration can trigger vivianite formation, and significantly increases the long-term phosphorus retention of sediments. Pore water equilibrium calculations demonstrated that supersaturated pore water is not sufficient to predict the occurrence of the mineral in situ. Those calculations often fail to predict the occurrence of vivianite because they do not adequately represent chemical conditions within sediment microenvironments. In summary, the formation of vivianite in aquatic sediments constitutes an important process in phosphorus sequestration which has so far largely been ignored.
ANCILLAI, DANIELE. "Ecotoxicity Studies On Marine Sediments". Doctoral thesis, Università Politecnica delle Marche, 2020. http://hdl.handle.net/11566/273387.
Pełny tekst źródłaEnvironmental laws in force in a country, constantly updated, both for the new materials presented in the market - of which non-toxicity must be proved - and for the new knowledge acquired in the field of health. In Italy, an important milestone in environmental management has been represented by the Ministerial Decree n. 173/2016, which finally recognized the importance of ecotoxicology in addition to chemical analysis. The necessity of integrating ecotoxicological data with chemical ones, in order to define the quality of marine dredged sediments deeply emerged. In fact, this study aimed at developing a novel approach to classify sediments when non correspondence between the chemical and ecotoxicological risk, identified by Decree n. 173, was found. From the chemical point of view, it could be done the fact that some polluting molecules have not been taken into consideration by D.M. 173, such as phthalates. On the ecotoxicological side, it must be remembered that the use of biological assay was initially aimed at defining a perturbation that had already occurred; instead today, in the D.M. 173, they are used together with the chemical parameters to have a predictive approach, using the analyses as a forecasting tool for the evaluation of the environmental risk and the classification of the different matrices. Although the use of living organisms in toxicity tests is well recognized and widely considered by methodologies and protocols developed by international environmental organization (ex. EPA, ISO, …), the occurrence of some limitation, also of ecological relevance, should be considered. The evaluation of toxicity is one of the most current topics of discussion not only in the world of research, but also in the political-administrative one: in fact, the problem of defining the toxicity of a sample is crucial to establish qualitative criteria and apply remediation programs and administrative sanctions. For all these reasons, chemical and ecotoxicological data should be supported by molecular data. In this study, the results obtained clearly demonstrated the suitability of C. gigas embryo as an excellent experimental model to obtain clear evidence about elutriated toxicity. In fact, despite the lack of correspondence between chemical and ecotoxicological data for the three selected sediment, which let hypothesize their different toxicity level, the molecular results obtained strongly suggest the ability of all sediments to cause oxidative stress in developing oyster. The identification of molecular biomarkers in oyster larvae exposed to sediment elutriates, could help in the classification of sediment quality and the results could be to integrate with the common chemical and ecotoxicological approach, significantly improving the evaluation system. In addition, despite not requested by the decree, an additional focus on phthalate detection was laid, and the effects of their environmental presence was explored in seabream analysing the effects of their dietary administration on the fish metabolism: adult males of S. aurata were exposed, through the diet, to two doses of DiNP, showing the ability of this compound to affect both the fish metabolism and antioxidant system. The evidence obtained in this study, strongly suggest to environmental agencies that the list of compounds to be monitored and considered for a better environmental management should be implemented. At the end, the results obtained in this study using an integrative approach allowed to gain a deeper knowledge on sediment toxicity, both from a chemical and a biological point of view.