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Letteratura scientifica selezionata sul tema "Water quality"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 14 settembre 2024

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Articoli di riviste sul tema "Water quality"

Hosmani, Shankar, P. "Assessment of Water Quality of Hassan lakes by NSF-Water Quality Index". Indian Journal of Applied Research 1, n. 3 (1 ottobre 2011): 18–19. http://dx.doi.org/10.15373/2249555x/dec2011/7.

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Moosa, Merfat Ebrahim Al, Munawwar Ali Khan, Usama Alalami e Arif Hussain. "Microbiological Quality of Drinking Water from Water Dispenser Machines". International Journal of Environmental Science and Development 6, n. 9 (2015): 710–13. http://dx.doi.org/10.7763/ijesd.2015.v6.685.

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Sivaranjani, S., Amitava Rakshit e Samrath Singh. "Water Quality Assessment with Water Quality Indices". International Journal of Bioresource Science 2, n. 2 (2015): 85. http://dx.doi.org/10.5958/2454-9541.2015.00003.1.

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Farooq, Zaeem. "Optimizing Water Filtration Through Machine Learning Based Water Quality Indexing". International Journal of Science and Research (IJSR) 13, n. 8 (5 agosto 2024): 1583–87. http://dx.doi.org/10.21275/sr24826150426.

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Asghari, Maryam. "Pollution Haven Effect and Water Quality". International Academic Journal of Economics 06, n. 01 (25 giugno 2019): 91–109. http://dx.doi.org/10.9756/iaje/v6i1/1910007.

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Hyun-Joo, Lee. "Application Effect of Water Quality HSPE & EPDC Models Used to Improve Water Quality in G lake". Journal of the Korean Society for Environmental Technology 22, n. 5 (31 ottobre 2021): 344–52. http://dx.doi.org/10.26511/jkset.22.5.5.

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Smith, James F., e William A. Kreutzberger. "Water Quality". Science 237, n. 4810 (3 luglio 1987): 11. http://dx.doi.org/10.1126/science.237.4810.11.a.

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Kerski, Joseph J. "Water Quality". Geography Teacher 14, n. 1 (2 gennaio 2017): 36–41. http://dx.doi.org/10.1080/19338341.2016.1260623.

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Khublaryan, Martin Gaikovich, e Tat’yana Ivanovna Moiseenko. "Water quality". Herald of the Russian Academy of Sciences 79, n. 3 (giugno 2009): 230–36. http://dx.doi.org/10.1134/s1019331609030058.

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SMITH, J. F., e W. A. KREUTZBERGER. "Water Quality". Science 237, n. 4810 (3 luglio 1987): 11. http://dx.doi.org/10.1126/science.237.4810.11.

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Tesi sul tema "Water quality"

House, Margaret A. "Water quality indices". Thesis, Middlesex University, 1986. http://eprints.mdx.ac.uk/13379/.

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Given the present constraints on capital expenditure for water quality improvements, it is essential that best management practices be adopted whenever possible. This research provides an evaluation of existing practices in use within the water industry for surface water quality classification and assesses water quality indices as an alternative method for monitoring trends in water quality. To this end, a new family of indices have been developed and evaluated and the management flexibility provided by their application has been examined. It is shown that water-quality indices allow the reduction of vast amounts of data on a range of determinand concentrations, to a single number in an objective and reproducible manner. This provides an accurate assessment of surface water quality which will be beneficial to the operational management of surface water quality. Previously developed water quality indices and classifications are reviewed and evaluated. Two main types of index are identified: biotic indices and chemical indices. The former are based exclusively upon biological determinands/indicators and are used extensively within the United Kingdom in the monitoring of surface water quality. The latter includes a consideration of both physico-chemical and biological determinands, but with an emphasis on the former variables. Their use is still the subject of much controversy and discussion. Four main approaches to the development of chemical indices can be identified in accordance with the aims and objectives of their design. Those developed for general application are known as General Water Quality Indices (WQIs) or Indices of Pollution, with the latter based predominantly upon determinands associated with man-made pollution. Those which reflect water quality in terms of its suitability for a specific use are termed use-related; whilst planning indices are those which attempt to highlight areas of high priority for remedial action on the basis of more wide-ranging determinands. The derivation and structure of previously developed indices have been evaluated and the merits and strengths of each index assessed. In this way, nine essential index characteristics were identified, including the need to develop an index in relation to legal standards or guidelines. In addition it was recognised that one requirement of an index should be to reflect potential water use and toxic water quality in addition to general quality as reflected by routinely monitored determinands. The development of river quality classifications within the United Kingdom is reviewed and the additional management flexibility afforded by the use of an index evaluated by comparing the results produced by the SOD (1976) Index with those of the National Water Council (NWC, 1977) Classification. The latter classification is that presently used to monitor water quality in Britain. The SOD Index was found to be biased towards waters of high quality and provided no indication of potential water use or toxic water quality. Nevertheless, it displayed a number of advantages over the NWC Classification in terms of the operational management of surface water quality. It was therefore decided to develop a new family of water quality indices, each based upon legally established water quality standards and guidelines for both routinely monitored and toxic determinands and each relating water quality to a range of potential water uses, thereby indicating economic gains or losses resulting from changes in quality. Four stages in the development of a water quality index are discussed: determinand selection; the development of determinand transformations and weightings; and the selection of appropriate aggregation functions. Four separate indices have been developed as a result of this research. These may be used either independently or in combination with one another where a complete assessment of water quality is required. The first of these is a General Water Quality Index (WQI) which reflects water quality in terms of a range of potential water uses. This index is based upon nine physico-chemical and biological determinands which are routinely monitored by the water authorities and river purification boards of England, Wales and Scotland. The second, the Potable Water Supply Index (PWSI) is based upon thirteen routinely monitored determinands, but reflects water quality exclusively in terms of its suitability for use in potable water supply (PWS). The two remaining indices, the Aquatic Toxicity (ATI) and Potable Sapidity (PSI) Indices are based upon toxic determinands such as heavy metals, pesticides and hydrocarbons which are potentially harmful to both human and aquatic life. Both indices are use-related, the former reflecting the suitability of water for the protection of fish and wildlife populations; the latter, the suitability of water for use in PWS. Each index is based upon nine and twelve toxic determinands respectively. These indices were developed in as objective and rigorous a manner as possible, utilising an intensive interview and questionnaire programme with members of both the water authorities and river purification boards. Rating curves were selected as the best way in which individual determinand concentrations could be transformed to the same scale. The scales selected for the WQI and PWSI are 10 - 100 and 0 - 100 respectively, whilst those of the ATI and PSI are 0 - 10. Each has been sub-divided in such a way as to indicate not only water quality, but also possible water use. Thus, the indices reflect both current and projected changes in the economic value of a water body which would occur as a result of the implementation of alternative management strategies. The curves were developed using published water quality standards and guidelines relating to specific water uses. Therefore, they contain information on standards which must be adhered to within the United Kingdom and this adds a further dimension to their management flexibility. Determinand weightings indicating the emphasis placed by water quality experts upon individual determinands were assigned to the determinands of the WQI and PWSI. However, weightings were omitted from the ATI and PSI due to the sporadic nature of pollution events associated with these determinands. These vary spatially and temporally, both in concentration and in terms of which determinand is found to be in violation of consent conditions. Therefore, on a national scale, no one determinand could be isolated as being more important than any other. Three aggregation formulae were evaluated for use within the developed indices: the weighted and unweighted versions of an arithmetic, modified arithmetic and multiplicative formulation. Each index was applied to data collected from a series of water quality monitoring bodies covering a range of water quality conditions. In each instance, the modified arithmetic formulation was found to produce index scores which agreed most closely with a predetermined standard, normally the classifications assigned using the NWC classification. In addition, this formulation produced scores which best covered the ascribed index range. However, the multiplicative unweighted formulation was retained for use within the ATI and PSI for the detection of zero index scores, i.e. when concentrations in excess of legal limits were recorded for these toxic determinands. The results from these studies validate the ability of each index to detect fluctuations in surface water quality. Therefore, the utility of the developed indices for the operational management of surface water quality was effectively demonstrated and the flexibility and advantages of an index approach in providing additional information upon which to base management decisions was highlighted.

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Kingdon, Lorraine B. "Water Quality Watchdogs". College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/295555.

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Maier, Stefan Heinrich. "Modelling water quality for water distribution systems". Thesis, Brunel University, 1999. http://bura.brunel.ac.uk/handle/2438/5431.

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Maintaining water quality in distribution systems has become a prominent issue in the study of water networks. This thesis concentrates on disinfectant and particle counts as two important indicators of water quality. The models discussed in this work are based on data collected by the author. The experimental set-up and procedure are described and observations of particle counts, particle counter size distributions, monochloramine as disinfectant, temperature, heterotrophic plate counts and epifluorescence microscopy counts are reported. A model of the response of particle counts to an increase in flow is developed. This model is obtained from specification derived from the data and assumptions, and is validated by its interpretability and its fit to data. A local shear-off density and an initial biofilm shedding profile were introduced and thus a linear model for this part of the water quality dynamics could be obtained. A procedure for the identification of the parameters of the local shear-off function and for the determination of the biofilm shedding profile is presented. This profile can be used to provide information about the status of the distribution system in terms of shear-off from the biofilm on the pipe walls. Monochloramine decay dynamics are investigated. The chlorine meter data is preprocessed with the help of titration data to correct meter drift. The data is then used in calibrating two different possible chlorine models: a model with a single decay coefficient and a model with bulk decay coefficient and wall demand (as used in Epanet). Important difficulties in identifying these parameters that come about because of the structure of the models are highlighted. Identified decay coefficients are compared and tested for flow, inlet chlorine and temperature dependence. The merits and limits of the approach to modelling taken in this work and a possible generalisation are discussed. The water industry perspective and an outlook are provided.

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Sun, Gwo-Shing 1959. "Water quality of gray water for reuse". Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/191907.

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This study was designed to evaluate the safety of gray water for reuse purposes. The physical and chemical quality of treated gray water met water reuse standards set by the State of Arizona for surface irrigation purposes. The number of microorganisms in gray water significantly decreased after biological treatment and sand filtration. However, the number of fecal coliform bacteria in treated gray water was still higher than the standard for reuse as set by the State of Arizona for surface irrigation. This is also true for rain water which was stored in a tank. No indigenous Salmonella were isolated from gray water. It was found that both Salmonella typhimurium and Shigella dysenteriae, seeded into gray water, can persist for at least several days. This implied that there may be some risk associated with gray water reuse when the gray water contains these pathogenic bacteria.

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Courtis, Benjamin John. "Water quality chlorine management". Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289743.

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Erickson, Victoria Gillispie. "Designing for Water Quality". Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/35105.

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The following document serves as a design guidebook to assist landscape architects, designers, planners, engineers, and architects in the practice of developing land while preserving water quality. This guidebook outlines methods for maximizing permeable surfaces by providing examples of ways to minimize impervious surfaces.
Master of Landscape Architecture

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Kilungo, Aminata Peter. "Drinking Water Quality Monitoring". Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/306073.

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This dissertation involves two different studies. The first concerns the real-time detection of microbial contamination in drinking water using intrinsic fluorescence of the microorganisms. The prototype, “Blinky”, uses LEDs that emit light at 365nm, 590nm, and 635nm for ultraviolet, amber, and red light, respectively. At 365 nm, the cellular components excited include reduced pyridine nucleotides (RPNs), flavins, and cytochromes to distinguish viable bacteria; at 590 nm, the cellular components excited include cytochromes for non-viable bacteria; at 635 nm, the cellular components excited include calcium dipicolinic acid (DPA) for spores. By using these three different wavelengths, the prototype can differentiate between viable and non-viable organisms and also has the potential to detect spores. The aim of this study was to improve the detection limit by modifying the design of the instrument and to establish the detection limit of viable and non-viable bacteria and spores. The instrument was modified by replacing existing LEDs with LEDs that had 50% more intensity. Two additional LEDs were added for amber and red light, bringing the total to four LEDs for each. The LEDs were also positioned closer to the photomultiplier tube so as to increase sensitivity. For UV, only two LEDs were used as previous. The detection limit of the viable bacteria was ~50 live bacteria/L. No change in the intrinsic fluorescence below the concentration of ~10⁸ dead bacteria/L was observed. The results for spore measurements suggested that most of the spores had germinated before or during the measurements and could not be detected. The instrument was successful in detection of viable bacteria and also differentiating viable and non-viable bacteria. The instrument was not successful in detection of spores. The second study was designed to assess the water quality of well construction in southeastern Tanzania. Three designs were tested: Msabi rope pump (lined borehole and covered), an open well converted into a closed well (uncovered well into a covered and lined well), and an open well (uncovered and may or may not be lined). The study looked at the microbial and chemical water quality, as well as turbidity. The survey included 97 water collection points, 94 wells and three rivers. For microbial analysis, heterotrophic plate count (HPC), total coliforms and E. coli tests were performed. Fifteen of these wells were further analyzed for microflora and diversity for wells comparison purposes, using culture methods, followed by polymerase chain reaction (PCR) and genome sequencing. Ten wells out of the fifteen were analyzed for calcium (water hardiness), potassium, nitrates, nitrites, chloride, fluoride, bromide, sulfate, iron, and arsenic. Two water collection points were also selected for organic compound analysis (gasoline components). All samples tested positive for coliforms. Two samples tested positive for Escherichia coli for the lined borehole (Msabi rope pump) and four samples from closed wells. All open wells tested positive for E. coli. There was more microbial diversity in open wells than the closed wells and Msabi rope pumps. Potential bacterial pathogens were detected in seven wells out of the fifteen examined. The wells that tested positive were one Msabi rope pump, one closed well; the rest were from open water sources. Open wells had high turbidity followed by closed wells. Msabi rope pumps had low turbidity comparing to the two wells designs. No traces of gasoline components were detected in any of the water sources. One well out of ten had high amounts of nitrates-nitrogen (> 10 mg/L). The results of this study showed that the Msabi rope pumps performed comparably to the closed wells in terms of microbial quality but performed better with regard to turbidity. The open wells performed poorly in terms of microbial water quality as well and turbidity. There was a statistical difference in HPC, total coliforms, E.coli numbers and turbidity between open wells, closed wells and the Msabi rope pumps. However, there was no statistical difference in HPC, total coliforms and E.coli numbers between the closed wells and Msabi rope pumps. Msabi rope pumps performed better in turbidity

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McCormick, Suzanne. "Air and Water Quality". College of Agriculture, University of Arizona (Tucson, AZ), 1992. http://hdl.handle.net/10150/295707.

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Wang, Zhong. "Adaptive water quality control in drinking water distribution". Cincinnati, Ohio : University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=1052325491.

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Sangameswaran, Sivaramakrishnan. "Water quality modeling of a storm water channel". ScholarWorks@UNO, 2003. http://louisdl.louislibraries.org/u?/NOD,52.

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Thesis (M.S.)--University of New Orleans, 2003.
Title from electronic submission form. "A thesis ... in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering"--Thesis t.p. Vita. Includes bibliographical references.

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Libri sul tema "Water quality"

Canter, Larry W. Ground water quality protection. Chelsea, MI: Lewis Publishers, 1987.

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Boyd, Claude E. Water Quality. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-23335-8.

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Boyd, Claude E. Water Quality. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17446-4.

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Boyd, Claude E. Water Quality. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4485-2.

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Kinnersley, David. Water quality. (S.l.): British Gas, 1990.

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Kinnersley, David. Water quality. (s.l.): British Gas, 1990.

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Ritter, Joseph A. Water quality. 4^a ed. Denver, Colo: American Water Works Association, 2010.

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Severn-Trent Water Authority. Water Quality Advisory Panel. Water quality. Birmingham: The Authority, 1985.

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Mackenzie River Basin Committee (Canada) e Canada. Inland Waters Directorate. Water Quality Branch., a cura di. Water quality. Regina, Sask: Water Quality Branch, Inland Waters Directorate, Environment Canada, 1985.

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Great Britain. Government Statistical Service. e Great Britain. Department of the Environment., a cura di. Water quality. London: Dept. of the Environment, 1988.

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Capitoli di libri sul tema "Water quality"

Price, Michael. "Water quality". In Introducing Groundwater, 172–204. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-1811-2_11.

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Biswas, Asit K. "Water Quality". In Water Resources of North America, 201–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-10868-0_24.

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Biswas, Asit K. "Water Quality". In Water Resources of North America, 25–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-10868-0_3.

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Biswas, Asit K. "Water Quality". In Water Resources of North America, 313–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-10868-0_35.

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Uslu, Orhan. "Water Quality". In Water Resources of Turkey, 203–40. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11729-0_7.

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Engman, E. T., e R. J. Gurney. "Water quality". In Remote Sensing in Hydrology, 175–92. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-009-0407-1_9.

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Chapra, Steven C. "Water Quality". In Handbook of Environmental Engineering, 333–49. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119304418.ch11.

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Pond, Katherine. "Water Quality". In Encyclopedia of Earth Sciences Series, 1841–47. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-93806-6_340.

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Romaire, Robert P. "Water Quality". In Crustacean and Mollusk Aquaculture in the United States, 415–55. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-1503-2_10.

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Pond, Katherine. "Water Quality". In Encyclopedia of Earth Sciences Series, 1–6. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-48657-4_340-2.

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Atti di convegni sul tema "Water quality"

Husak, M., A. Laposa, P. Kulha e P. Nepras. "Quality water analyzer". In 2014 10th International Conference on Advanced Semiconductor Devices & Microsystems (ASDAM). IEEE, 2014. http://dx.doi.org/10.1109/asdam.2014.6998680.

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Davidson, W. S. "Water quality monitoring". In Proceedings of SOUTHCON '94. IEEE, 1994. http://dx.doi.org/10.1109/southc.1994.498151.

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Champanis, Michael, e Ulrike Rivett. "Reporting water quality". In the Fifth International Conference. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2160673.2160688.

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Gumelar, Adipati Rahmat, Rudhy Akhwady e Abimanyu Takdir Alamsyah. "Pantura Water Quality". In the 2018 8th International Conference. New York, New York, USA: ACM Press, 2018. http://dx.doi.org/10.1145/3180382.3180397.

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Singh, Saurabh, Anurag Kumar Singh, Vishwanath Gupta e Yogesh Kumar. "Water Quality Monitoring". In 2022 4th International Conference on Advances in Computing, Communication Control and Networking (ICAC3N). IEEE, 2022. http://dx.doi.org/10.1109/icac3n56670.2022.10074257.

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Yu, Ziwen, Yifu Sheng, Hao Li, Peilun Li, Jianjun Zhang, Ke Xiao, Li Wang e Haijun Lin. "Water Quality Classification Evaluation based on Water Quality Monitoring Data". In 2023 11th International Conference on Information Systems and Computing Technology (ISCTech). IEEE, 2023. http://dx.doi.org/10.1109/isctech60480.2023.00102.

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Verma, Monika, Kuldeep Srivastava, Nirdesh Regmi Avinandan, Joshan Gajurel, Mandesh Kumar Yadav e Sonam Lekzin. "Water quality analysis using WQI (water quality index): Review paper". In SECOND ONLINE INTERNATIONAL CONFERENCE ON RESEARCH FRONTIERS IN SCIENCES, 070006. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0224856.

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Michaelsen, J., B. Bergu, J. Marrelli e M. Theobald. "Subsea Water Injection-Water Quality Management". In Offshore Technology Conference. Offshore Technology Conference, 2005. http://dx.doi.org/10.4043/17544-ms.

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Sobotova, Lydia. "WATER QUALITY IN WATER JET TECHNOLOGY". In 13th SGEM GeoConference on WATER RESOURCES. FOREST, MARINE AND OCEAN ECOSYSTEMS. Stef92 Technology, 2013. http://dx.doi.org/10.5593/sgem2013/bc3/s12.059.

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Rochon, J., M. R. Creusot, P. Rivet, C. Roque e M. Renard. "Water Quality for Water Injection Wells". In SPE Formation Damage Control Symposium. Society of Petroleum Engineers, 1996. http://dx.doi.org/10.2118/31122-ms.

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Rapporti di organizzazioni sul tema "Water quality"

Raikow, David, e Kelly Kozar. Quality assurance plan for water quality monitoring in the Pacific Island Network. National Park Service, 2023. http://dx.doi.org/10.36967/2300648.

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In accordance with guidelines set forth by the National Park Service Inventory and Monitoring Division, a quality-assurance plan has been created for use by the Pacific Island Network in the implementation of water quality monitoring protocols, including the marine water quality protocol (Raikow et al. 2023) and future water quality protocols that will address streams and standing waters. This quality-assurance plan documents the standards, policies, and procedures used by the Pacific Island Network for activities specifically related to the collection, processing, storage, analysis, and publication of monitoring data. The policies and procedures documented in this quality assurance plan complement quality assurance efforts for other components of the overall protocol workflow, including initial creation of the protocol as described in the protocol narrative and quality assurance plans for other monitoring activities conducted by the Pacific Island Network.

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Raikow, David, e Kelly Kozar. Quality assurance plan for water quality monitoring in the Pacific Island Network. National Park Service, 2023. http://dx.doi.org/10.36967/2300662.

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Price, Richard E., Jeffery P. Holland, Jr Gunkel e Robert C. Water Quality Research Program. Fort Belvoir, VA: Defense Technical Information Center, marzo 1994. http://dx.doi.org/10.21236/ada278877.

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Haden, David. Water Quality Research Plans. Ames: Iowa State University, Digital Repository, 2005. http://dx.doi.org/10.31274/farmprogressreports-180814-1283.

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Haden, David. Water Quality Research Update. Ames: Iowa State University, Digital Repository, 2006. http://dx.doi.org/10.31274/farmprogressreports-180814-2659.

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Spinka, H., e P. Jackowski. Purified water quality study. Office of Scientific and Technical Information (OSTI), aprile 2000. http://dx.doi.org/10.2172/754234.

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Mukuyu, P., N. Jayathilake, M. Tijani, J. Nikiema, C. Dickens, J. Mateo-Sagasta, D. V. Chapman e S. Warner. Country water quality profiles: towards developing an African Water Quality Program (AWaQ). International Water Management Institute (IWMI), 2024. http://dx.doi.org/10.5337/2024.215.

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Garcia-Chang, Santana. Storm Water Individual Permit Water Quality Improvement. Office of Scientific and Technical Information (OSTI), luglio 2013. http://dx.doi.org/10.2172/1089477.

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Author, Not Given. North Alabama water quality assessment. Office of Scientific and Technical Information (OSTI), settembre 1987. http://dx.doi.org/10.2172/5032666.

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Pullin, B. P. North Alabama water quality assessment. Office of Scientific and Technical Information (OSTI), marzo 1988. http://dx.doi.org/10.2172/5038651.

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