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Tesis sobre el tema "Water quality measurement"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 20 de febrero de 2023

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1

Bujatzeck, Baldur. "Statistical evaluation of water quality measurements." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0017/MQ44134.pdf.

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2

Jiang, Meng. "Evaluation of Low-Cost Water Quality Measurement System." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-27179.

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Water is a very important element in our daily life, being able to check the water quality by ourselves would be a useful project to improve our life quality. My idea is to create something cheap and easy to examine the water quality and test it to see if it is capable for outdoor using as well. In this project I chose a DS18B20 as a temperature sensor. To get a system which can work as a water pump I chose an L298P as a motor driver board to support the electric motor, a Hall flow meter to get the flow and quantity, and a Water sensor to get the conductivity. With the Arduino and the Visual S

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3

Rajele, Molefi Joseph. "A comparison of SAAS and chemical monitoring of the rivers of the Lesotho Highlands Water Project." Thesis, University of the Western Cape, 2004. http://etd.uwc.ac.za/index.php?module=etd&amp.

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The Lesotho Highlands Development Authority routinely uses the South African Scoring System version 4 (SASS4) in conjunction with water chemistry to monitor water quality of rivers in the Lesotho Highlands Water Project areas. The objective of this study was to test the efficiency of SASS4 in these areas.

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4

Saberi, Atefeh. "Automatic outlier detection in automated water quality measurement stations." Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/25908.

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Des stations de mesure de la qualité de l’eau sont utilisées pour mesurer la qualité de l'eau à haute fréquence. Pour une gestion efficace de ces mesures, la qualité des données doit être vérifiée. Dans une méthode univariée précédemment développée, des points aberrants et des fautes étaient détectés dans les données mesurées par ces stations en employant des modèles à lissage exponentiel pour prédire les données au moment suivant avec l’intervalle de confiance. Dans la présente étude, ne considérant que le cas univarié, la détection de points aberrants est améliorée par l’identification d’un

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5

Sharpe, Taylor Jeffery. "Assessing a Fluorescence Spectroscopy Method for In-Situ Microbial Drinking Water Quality." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3838.

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Waterborne disease is a significant contributor to the global burden of disease, in particular among high-risk populations in developing nations. State-of-the-art methods for the enumeration of microbial pathogens in drinking water sources have important limitations, including high initial cost, 24-48 hour delays in results, high staffing and facility requirements, and training requirements which all become especially problematic in the developing nation context. A number of alternative approaches to microbial water quality testing have been proposed, with the goal of decreasing the required t

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6

Kwong, Pui-ki, and 鄺沛琪. "Surface water quality indicators in China and their implications for sustainability." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36618718.

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7

Nam, Kijin. "Optimization of paths and locations of water quality monitoring systems in surface water environments." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24745.

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Thesis (Ph.D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Aral, Mustafa; Committee Member: Guan, Jiabao; Committee Member: Kim, Seong-Hee; Committee Member: Roberts, Philip; Committee Member: Uzer, Turgay.

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8

岑永昌 and Wing-cheong Sham. "The determination of mercury in sediment, river water and seawater samples, and the determination of Cr(VI) in river water." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31210533.

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9

Peacock, Steven. "Storm Water System Monitoring for the Small Municipality Under Phase II of the National Pollutant Discharge Elimination System." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4298/.

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Storm water quality can have a significant impact on receiving water bodies. The chief recipients of these impacts are aquatic life in the receiving water body and downstream water users. Over the last few decades, legislation, regulations, institutions and facilities have evolved to recognize the impact of urban storm water on receiving streams. This increased emphasis has caused contaminants in storm water to be identified as a major concern. This developing concern has generated an increased interest in the water quality of our streams and lakes and emphasized the need for more monitoring e

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10

Slaughter, Andrew Robert. "Modelling the relationship between flow and water quality in South African rivers." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1006196.

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The National Water Act (Act 36 of 1998) provides for an ecological Reserve as the quantity (flow) and quality of water needed to protect aquatic ecosystems. While there are methods available to quantify the ecological Reserve in terms of flow, methods of linking flow to water quality are lacking. Therefore, the research presented in this thesis investigated various modelling techniques to estimate the effect of flow on water quality. The aims of the research presented in this thesis were: Aim 1: Can the relationship between flow and water quality be accurately represented by simple statistical

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11

Heller, Winfried. "Hydro-dynamic effects with particular consideration of water quality and their measurement methods." Doctoral thesis, Tönning; Lübeck; Marburg : Der Andere Verl, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979397405.

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12

Heller, Winfried. "Hydro-dynamic Effects with Particular Consideration of Water Quality and their Measurement Methods." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1141217614058-76453.

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Die Entwicklung der Strömungsmechanik im 20. Jahrhundert wurde auch durch intensive Forschungen geprägt, um die zahlreichen in der Praxis auftretenden hydrodynamischen Effekte zu ergründen, die physikalischen Abläufe und Zusammenhänge zu verstehen und diese mathematisch zu beschreiben. Dies wurde notwendig, da mit den hydrodynamischen Grundgleichungen allein keine Beschreibung der aus den Fluideigenschaften resultierenden Erscheinungen in Flüssigkeitsströmungen möglich war. Um die Qualität der Flüssigkeiten bezüglich ihres Gasgehaltes und ihrer Keimverteilung beurteilen zu können, wurden mit B

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13

Cheng, Man-shun, and 鄭文順. "A review of river water quality in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31253982.

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14

Kauten, Rebecca Lynn. "Chloride and corrosiveness: trends, indices, scales of measurement, and agency management capacity to address freshwater salinization." Diss., University of Iowa, 2019. https://ir.uiowa.edu/etd/6970.

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This study localizes dimensions of freshwater salinization by directly measuring chloride concentrations in ungauged urban streams, assessing the relationship between chloride, copper and zinc in sample data, measures statewide trends for Iowa, and considers the regulatory and cultural environment of managing winter roads. Chloride concentrations in local, urban streams generally persist at higher levels than what is typical of natural Iowa waters. Runoff from snow melt events violate water quality standards, with chloride concentrations more closely resembling sea water than freshwater. Meanw

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15

Ngwenya, Faith. "Water quality trends in the Eerste River, Western Cape, 1990 - 2005." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_2843_1189582559.

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<p>The Eerste River is a river system which has, over the years, been subjected to human interference. The purpose of this study was to investigatge temporal and spatial trends in the water quality of the Eerste River between 1990 and 2005. The study results revealed that the major trends in the water quality of the Eerste River are more spatial than temporal.</p>

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16

Juza, Holly Kay. "Water Quality Model for South Slough, Coos Bay, Oregon." PDXScholar, 1995. https://pdxscholar.library.pdx.edu/open_access_etds/5046.

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The South Slough Estuary is located off Coos Bay along the southern coast of Oregon. It is divided into two channels that meet and continue to Coos Bay at the Charleston Harbor. There are six major contributing streams to South Slough. After rainfall events, the level of coliform bacteria in the slough increases because of stream bacteria loading. This is due to cattle grazing in the drainage areas, failed septic systems from private homes, and sewage sludge applied to the County landfill, which drains into the slough. The Oregon Health Division has enforced a Sanitation Management Plan for Co

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17

Fiallos, Celi Diana E. "Water quality assessment of Prairie Creek Reservoir in Delaware County, Indiana." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1391474.

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The Prairie Creek Reservoir, located in east central Indiana in an agricultural watershed, serves as a secondary drinking water source as well as a recreational facility. Limited research of water quality performed at the reservoir has affected management decisions over the past years, threatening its future.. Consequently, additional investigation was necessary to examine the reservoir dynamics, and continue to provide data to determine long-term water quality trends. Basic water quality parameters were measured using a Hydrolab Sonde, nutrients were measured spectrophotometrically, and a Sec

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18

Heller, Winfried [Verfasser]. "Hydro-dynamic effects with particular consideration of water quality and their measurement methods / Winfried Heller." Tönning, 2005. http://d-nb.info/979397405/34.

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19

Coetzee, George. "Handheld infrared CO2 gas detector." Thesis, Port Elizabeth Technikon, 2000. http://hdl.handle.net/10948/28.

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A handheld InfraRed (IR) Carbon Dioxide (CO2) gas detector was developed and used to carry out a study of water and urine samples in South Africa. The details of the model and the results of the study are discussed here. The overseas markets are not geared for the current South African conditions. Use is made of components that can be obtained locally. Imported components are very expensive and should an imported model be damaged, it has to be returned overseas to be repaired. As an illustration of this technology it was decided to perform research in water technology and then develope a handh

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20

Williams, Chavon R. "A National survey of Mercury levels in South Africa's water management areas." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8674_1298356510.

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<p>This study forms part of a broader project co-funded by the Water Research Commission (WRC), and CSIR Parliamentary Grant (PG) and Strategic Research Panel (SRP) research grants, aimed at surveying selected water resources within the 19 Water Management Areas in South Africa. Furthermore, it aims at determining the concentrations of Hg and MeHg in various environmental compartments collected from priority water resources, to identify the potential Hg hotspots, and to assess the degree of compliance with national and international guidelines. Mercury concentrations in the environment have in

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21

Telci, Ilker Tonguc. "Optimal water quality management in surface water systems and energy recovery in water distribution networks." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45861.

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Two of the most important environmental challenges in the 21st century are to protect the quality of fresh water resources and to utilize renewable energy sources to lower greenhouse gas emissions. This study contributes to the solution of the first challenge by providing methodologies for optimal design of real-time water quality monitoring systems and interpretation of data supplied by the monitoring system to identify potential pollution sources in river networks. In this study, the optimal river water quality monitoring network design aspect of the overall monitoring program is addressed b

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22

Decker, Timothy Joseph. "An assessment of water quality on Little and Big Duck Creeks near Elwood, Indiana." Virtual Press, 1987. http://liblink.bsu.edu/uhtbin/catkey/539626.

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A water quality study was conducted on Big Duck Creek and Little Duck Creek near Elwood, Indiana during the summer, autumn and winter of 1978 - 1979 and compared to measurements made in 1938.Samples were analyzed for dissolved oxygen, biochemical oxygen demand, suspended solids, ammonia, total coliform bacteria, hydrogen ion concentration and temperature. Significant differences in concentrations were observed for each environmental parameter measured in 1979 when evaluated on a basis of sampling location. With the exception of dissolved oxygen concentrations, the effect of stream volume on th

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23

Ko, Man-yan Fanny, and 高文欣. "A review of the indicators used for monitoring beach water quality in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31254573.

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24

Albus, Kelly. "Long-Term Citizen Science Water Monitoring Data: An Exploration of Accuracy over Space and Time." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404518/.

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The Texas Stream Team (TST) is one of an increasing number of citizen science water monitoring programs throughout the US which have been continuously collecting surface water quality data under quality assurance protocols for decades. Volunteer monitoring efforts have generated monitoring datasets that are long-term, continuous, and cover a large geographic area - characteristics shown to be valuable for scientists and professional agencies. However, citizen science data has been of limited use to researchers due to concerns about the accuracy of data collected by volunteers, and the decades

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25

Meyers, Jennifer. "Developing Non-lethal Biomarkers to Detect Exposure to Organic Contaminants in Aquatic Habitats." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/MeyersJ2009.pdf.

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26

Moynan, Kathleen M. "The effects of acid and water hardness on bluegill embryo-larvae determined by laboratory and on-site toxicity tests." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/46053.

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<p>The sensitivity of bluegill (<i>Lepomis macrochirus</i>) to low pH in soft (12 or 18 mg/L CaCO<sub>3</sub>) and hard (165 or 197 mg/L CaCO<sub>3</sub>) water was compared in five day laboratory toxiclty tests. Embryo-larval bluegill were exposed to pH levels ranging from 3.8 to 7.0 in soft water and from 3.8 to 8.0 in hard water. An on-site toxicity test, using lake water (3.4 mg/L CaCO<sub>3</sub>) adjusted to pH levels ranging from 3.5 to 7.3, was conducted to compare laboratory and field results. At low pH, hatching was reduced, the hatching period prolonged, and the incidence of p

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27

Li, Weiping. "A subsurface water quality evaluation system for assessing NPS pollution potential by pesticides." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40028.

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A watershed scale water quality evaluation system was developed for assessing spatial variation of subsurface pesticide movement. The system consists of a linked-transport model component for performing simulation and a GIS component for processing spatially-related data. The surface heterogeneity caused by agricultural activities, topographic, hydrologic, and soil type variations in a watershed was handled by partitioning the watershed into homogeneous subfields. The subsurface soil profile and aquifer heterogeneities were considered by dividing the subsurface domain into root zone, intermedi

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28

Rossano, Eriko Morishita. "Definition and measurement of stream health in Japan based on index of biological integrity (IBI) concepts /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/5401.

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29

Huang, Jianyin. "Development and Evaluation of the Diffusive Gradients in Thin Films (DGT) Techniques for the Measurement of Nutrient Concentrations in Natural Waters." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/367045.

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Due to rapid industrialisation, the growing global population, and the impacts of climate change, the availability and quality of water resources around the world has become degraded. Some regions are suffering water shortages despite sufficient water reserves, because surface and ground waters are contaminated to such a degree that they have become inadequate for potable use. Agricultural practices, industrial discharges and human wastewater are responsible for most contamination of water. Nitrogen (ammonium, nitrate and nitrite) and phosphorus (phosphate) are the most common nutrients in fre

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30

Un, Ka Man. "Real-time ocean optical fiber sensing of phytoplankton for studies in size distribution, concentration and biomass." HKBU Institutional Repository, 1999. http://repository.hkbu.edu.hk/etd_ra/265.

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31

Jones, Philip Edward James. "Evaluation of water distribution system monitoring using stochastic dynamic modeling." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/40441.

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A stochastic dynamic constituent transport model was developed, capable of simulating the operation of a water distribution system containing pumps and storage tanks, and subject to random demands and contaminant inputs. Long term operation of a hypothetical small town water supply system containing one pump station and one storage tank was simulated while the system was subjected to external contaminant inputs. Repeated simulations were made under different regimes of external contamination applied to the tank, the pump station and at system nodes, and internal contamination representing biof

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32

Fourie, Shani. "An assessment of water quality and endocrine disruption activities in the Eerste/Kuils River catchment system, Western Cape, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/20917.

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Thesis (MSc)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Water quality analysis forms the basis in assessing and monitoring catchments. As urban development continuously increase, pollution sources increase in either point source (wastewater treatment works, industrial effluents) and/or non-point source origin (storm water discharge, domestic pollutants), accumulating pollutants in the environment. It was only recently discovered that certain pollutants have subtle disrupting effects on the endocrine system resulting in health related problems associated with the reproductive

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33

Mensah, Paul Kojo. "Environmental water quality management of glyphosate-based herbicides in South Africa." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001987.

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Although the use of pesticides is necessary to meet the socio-economic needs of many developing countries, especially in Africa, side effects of these bio-active chemicals have contributed to contaminating aquatic and terrestrial ecosystems. Environmental water quality degradation by pesticides interferes with ecosystem health and poses numerous risks to aquatic life. In South Africa, glyphosate-based herbicides are frequently used to control weeds and invading alien plants, but ultimately end up in freshwater ecosystems. However, there are no South African-based environmental water quality ma

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34

Marinaro, Ralph Michael. "Investigation of water vapor effects on the detection of nitric acid vapor with the tungstic acid technique." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/71262.

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An automated tungstic acid technique (TAT) has been successfully used to measure gaseous HNO₃ in the presence of water vapor. The TAT is based on the diffusion of gaseous HNO₃ to the interior walls of a tube coated with tungsten VI oxide (WO₃), where it is selectively chemisorbed. The collected HNO₃ sample is thermally desorbed from the WO₃ surface, as NO, and measured by a chemiluminescent oxides of nitrogen analyzer. The integrated analyzer response is directly proportional to the nitric acid collected. Based on nitric acid hydration characteristics, a decrease in the diffusion coefficient

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35

Ma, Ying. "Monitoring of heavy metals in the Bottelary River using Typha capensis and Phragmites australis." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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The aim of this study was to use plants to determine the degree of heavy metal contamination in water and sediments in order to effectively monitor and provide possible recommendation to improve the water quality in the aquatic ecosystem of the Bottelary River.

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36

Ляшок, Максим Олексійович. "Вимірювання рівня якісної води в організмі людини – шлях до її здоров’я". Thesis, Молодіжна наукова ліга, 2021. https://er.knutd.edu.ua/handle/123456789/18980.

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У сучасному світі великих швидкостей і цифрових технологій дуже гостро стоїть питання збереження активного способу життя та здоров’я. У зв’язку з цим окрему нішу зайняли інструменти digital health, в тому числі мобільні додатки для управління та контролю стану організму людини. Сфера digital health активно розвивається, створюючи нові та вдосконалюючи свої продукти, впроваджуються цифрові інновації в клінічну практику і повсякденне життя.

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37

Retief, Daniel Christoffel Hugo. "Investigating integrated catchment management using a simple water quantity and quality model : a case study of the Crocodile River Catchment, South Africa." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017875.

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Internationally, water resources are facing increasing pressure due to over-exploitation and pollution. Integrated Water Resource Management (IWRM) has been accepted internationally as a paradigm for integrative and sustainable management of water resources. However, in practice, the implementation and success of IWRM policies has been hampered by the lack of availability of integrative decision support tools, especially within the context of limited resources and observed data. This is true for the Crocodile River Catchment (CRC), located within the Mpumalanga Province of South Africa. The ca

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38

Hwang, Du-Hyun Dwayne. "Flow quality measurement based on stratification of flow in nitrogen gas-water and HFC-134a refrigerant-PAG oil two-phase flow systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58743.pdf.

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39

Kamish, Wageed. "Hydrosalinity modelling of the Berg River using ACRUSalinity." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/2067.

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Thesis (MScEng (Civil Engineering))--Stellenbosch University, 2008.<br>In recent years, concern about the water quality in the Berg River received a fair degree of attention, particularly with the imminent construction of the Berg Water Project (BWP). Particular concerns have been expressed about the water quality with respect to total dissolved salts (TDS) at Misverstand Dam. In previous studies (Fourie and Görgens, 1977) it was identified that the saline water was mostly generated in the lower portion of the Berg River Catchment (Matjies, Moorreesburg and Sandspruit Rivers) and that the

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40

Rosfjord, Catherine Harney. "An Evaluation of 20 Year Changes in Chemistry in the EPA Easter Lake Survey, A Statistical Population of Lakes in the Northeastern U.S." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/RosfjordCH2005.pdf.

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41

Chan, Ka Ming. "The use of the rock shell, thais clavigera, as a biomonitor of tributyltin contamination in Hong Kong and Shenzhen." HKBU Institutional Repository, 2008. http://repository.hkbu.edu.hk/etd_ra/860.

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42

Kleyi, Phumelele Eldridge. "The development of functionalized electrospun nanofibers for the control of pathogenic microorganisms in water." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013134.

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The thesis presents the development of functionalized electrospun nylon 6 nanofibers for the eradication of pathogenic microorganisms in drinking water. Imidazole derivatives were synthesized as the antimicrobial agents and were characterized by means of NMR spectroscopy, IR spectroscopy, elemental analysis and X-ray crystallography. The first set of compounds (2-substituted N-alkylimidazoles) consisted of imidazole derivatives substituted with different alkyl groups (methyl, ethyl, propyl, butyl, heptyl, octyl, decyl and benzyl) at the 1-position and various functional groups [carboxaldehyde

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43

Rheem, Sungsue. "Multivariate nonparametric trend assessment with environmental applications." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/40145.

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44

Catterall, Kylie. "Development of a Rapid Microbial-Based Toxicity Assay Employing Ferricyanide as an Artificial Respiratory Electron Acceptor." Thesis, Griffith University, 2007. http://hdl.handle.net/10072/367811.

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The use of ferricyanide-mediated microbial reactions was investigated with a view to developing a rapid microbial-based toxicity assay to overcome the short falls of existing techniques currently employed in the water and wastewater industry. This assay, known as the ferricyanide-mediated toxicity (FMTOX) assay, employs ferricyanide in place of oxygen as an artificial electron acceptor during microbial respiration. The principle behind this assay is similar to conventional microbial-based toxicity assays that quantify the inhibition of the electron transport system of microorganisms. In this c

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45

Appel, Patrick L. "Use of Automated Sampler to Characterize Urban Stormwater Runoff in Pecan Creek." Thesis, University of North Texas, 2000. https://digital.library.unt.edu/ark:/67531/metadc2681/.

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The purpose of this study was to use the Global Water Stormwater Sampler SS201 to characterize the urban runoff in Pecan Creek. Location of the samplers was influenced by land use and ease of installation. Determination of the constituents for analysis was modeled after those used in the NPDES permit for seven cities within the Dallas/Ft.Worth metroplex. Some metals, notably cadmium and arsenic, exceeded the U.S. EPA's MCL's. Statistical analysis revealed first flush samples to be significantly more concentrated than composite samples. Minimum discharge loadings were found to be significantly

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46

Li, Weijia, and n/a. "Development of New Binding Phases for Speciation Measurements of Trace Metals with the Diffusive Gradients in Thin Films Technique." Griffith University. School of Environmental and Applied Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040504.150905.

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The recently developed technique of diffusive gradients in thin films (DGT) for speciation measurement of analytes in the environment was further developed through the development of series of new binding phases including poly(acrylamide-co-acrylic acid) copolymer hydrogel (PAM-PAA), poly(acrylamidoglycolic acid-co-acrylamide) (PAAGA-PAM) hydrogel, the Whatman P81 cellulose phosphate ion exchange membrane (P81) and a liquid binding phase of poly(4-styrenesulfonate) (PSS). A new diffusion layer, cellulose dialysis membrane, was also employed for the liquid binding phase DGT. PAM-PAA copolyme

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47

Li, Weijia. "Development of New Binding Phases for Speciation Measurements of Trace Metals with the Diffusive Gradients in Thin Films Technique." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367741.

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The recently developed technique of diffusive gradients in thin films (DGT) for speciation measurement of analytes in the environment was further developed through the development of series of new binding phases including poly(acrylamide-co-acrylic acid) copolymer hydrogel (PAM-PAA), poly(acrylamidoglycolic acid-co-acrylamide) (PAAGA-PAM) hydrogel, the Whatman P81 cellulose phosphate ion exchange membrane (P81) and a liquid binding phase of poly(4-styrenesulfonate) (PSS). A new diffusion layer, cellulose dialysis membrane, was also employed for the liquid binding phase DGT. PAM-PAA copolyme

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48

Lambert, Patricia. "Evaluation of the Chlorophyll/Fluorescence Sensor of the YSI Multiprobe: Comparison to an Acetone Extraction Procedure." Thesis, University of North Texas, 2001. https://digital.library.unt.edu/ark:/67531/metadc2794/.

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The purpose of this study was to examine the suitability of the YSI model 6600 Environmental Monitoring System (multiprobe) for long term deployment at a site in Lewisville Lake, Texas. Specifically, agreement between a laboratory extraction procedure and the multiprobe chlorophyll/fluorescence readings was examined. Preliminary studies involved determining the best method for disrupting algal cells prior to analysis and examining the precision and linearity of the acetone extraction procedure. Cell disruption by mortar and pestle grinding was preferable to bath sonication. Comparison of t

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49

Wagner, Derrick Lee. "Hydrogeologic Characterization of Dutch Canyon, Scappoose, Oregon." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1020.

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Dutch Canyon is located directly west of the City of Scappoose in Columbia County Oregon. This area is proximate to Highway 30, a major access corridor to downtown Portland, and is experiencing a population increase, which is expected to continue and likely accelerate. As a result, there is growing pressure on water resources. Individual and community efforts to utilize groundwater resources have been hampered by generally poor groundwater yields and water quality concerns outside of the Columbia River corridor and a lack of published hydrogeologic information for the region. The intent of thi

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50

Ververs, James. "A quantitative method for reproducible ionization chamber alignment to a water surface for external beam radiation therapy depth dose measurements." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2600.

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Ionization chambers (ICs) are the most commonly used detectors for radiation therapy dose measurements. Typical IC measurements use cylindrical ICs in a water phantom and therefore require initial IC alignment to the water surface. This alignment has long been ignored and only recently has a qualitative governing recommendation been made. This thesis describes a reproducible methodology for quantitative ionization chamber water surface alignment. Depth-ionization measurements are taken with twenty-eight IC designs under varying conditions including, but not limited to, changes in scan directio

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