Tesis sobre el tema "Pollution pattern"
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Tegegn, Ferezer. "Physico-chemical pollution pattern along Akaki River basin, Addis Ababa, Ethiopia". Thesis, Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-80460.
Texto completoPurkayastha, Kanan K. "Pattern recognition and an OH reactivity study of urban air pollution". Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.683909.
Texto completoHantsch, Nichole M. "Pattern and process of watershed nutrient dynamics in South Central New York". Diss., Online access via UMI:, 2008.
Buscar texto completoBellchamber, Sara B. "Simulating the effects of riparian zone delineation and management practices on landscape pattern and timber production". Diss., Columbia, Mo. : University of Missouri-Columbia, 2004. http://hdl.handle.net/10355/4106.
Texto completoThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (June 29, 2006) Vita. Includes bibliographical references.
Shrestha, Samata. "IMPACT OF NEIGHBORHOOD MORPHOLOGY ON AIR POLLUTION DISPERSION PATTERNS DUE TO UNPLANNED BUILDING DEMOLITION: A PARAMETRIC STUDY". Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent155654365109521.
Texto completoPhilander, Lorraine. "The effect of an argumentation-based instructional approach on Grade 3 learners' understanding of river pollution". Thesis, University of the Western Cape, 2012. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_7227_1381213860.
Texto completoThe research reported in this paper involves the use of dialogical argumentation in scientific context with 7-9 year olds as part of teaching and learning in primary classrooms. To develop an understanding of scientific concepts, four suitable collaborative activities on river pollution were used as a stimulus to effectively engage learners in scientific reasoning and use evidence for decision-making through cognitive harmonization. The research, involved four groups of five children each. Data were collected through analysis of children&rsquo
s Water Pollution Questionnaire (WPQ), classroom observation, documentation of field notes, conversations and focus group interviews. The study found that all groups were able to engage in the activities to some extent, but that good quality argumentation develops when children are familiar with working in this manner. This study sought to investigate the opportunities, possibilities and challenges associated with a dialogical argumentation teaching and learning approach in a primary school science class A mapping technique was used to analyze the children&rsquo
s discussions and identify the quality of their different &ldquo
levels&rdquo
of argument. This study confirmed that an argumentation based instruction was an effective way of enhancing learners&rsquo
understanding of river pollution. The learners&rsquo
listening skills improved tremendously and they were actively involve during discussions and provided claims with valid grounds or reasons. They were also very enthusiastic and challenged each other&rsquo
s claims during these argumentation lessons, but most of all was the enjoyment that was visible on their young faces. Further research needs to be carried out over a longer period to determine the effectiveness of an argumentation based instruction.
Magerman, Ruben Clive. "Effects of an argumentation-based instruction on grade 10 learners' understanding of the causes of pollution at a river site". Thesis, University of the Western Cape, 2011. http://hdl.handle.net/11394/1777.
Texto completoThis study was based on the Science and Indigenous Knowledge Systems Project (SIKSP) at the School of Science and Mathematics Education, University of the Western Cape. The project seeks to enhance educators' understanding of and ability to implement a Science-IKS curriculum (Ogunniyi, 2007) through using the theoretical framework of argumentation (Toulmin Argument Pattern) to the extent that learners would value the significance of both worldviews. This study sought to find the effects of an Argumentation-Based Instruction on grade 10 learners' understanding of the causes of pollution at a river site. Since the integration of Science and IKS are envisaged by Curriculum 2005 (C2005), two theoretical argumentation constructs have been used namely, Toulmin's (1958) Argumentation Pattern (TAP) and Ogunniyi's (1995) Contiguity Argumentation Theory (CAT).
South Africa
Henshaw, Stephen John. "Trends and patterns in urban air pollution in the UK". Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509769.
Texto completoAl-Mutawa, Ayesha Ibrahim. "The influence of the meteorological conditions on air pollution levels in Emirate of Dubai, United Arab Emirates". Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366431.
Texto completoForselius, Ellen. "Spatial patterns of pollution associated with creosote treated poles in Mälardalen". Thesis, Stockholms universitet, Institutionen för naturgeografi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-120583.
Texto completoHall, Kimberlee K., Brian G. Evanshen, Kurt J. Maier y Phillip R. Scheuerman. "Using Multivariate Statistics to Identify Patterns Association Land Use to Fecal Pollution Sources.Similar Creeks in Northeast Tennessee to Identify Patterns Associating Land Use to Fecal Pollution Sources". Digital Commons @ East Tennessee State University, 2011. https://dc.etsu.edu/etsu-works/2948.
Texto completoLong, Xuezhu. "Particulate air pollution in central London : characterisation, temporal patterns and source apportionment". Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247431.
Texto completoBa-Akdah, Mohammad Abdulaziz Salim. "Patterns in the uptake, release, distribution, and transfer of petroleum hydrocarbons in marine organisms". Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/1304.
Texto completoMonthe, Luc Arthur. "Etude des équations aux dérivées partielles hyperboliques application aux équations de Saint-Venant". Rouen, 1997. http://www.theses.fr/1997ROUES074.
Texto completoWade, Katherine Signs. "A Descriptive Analysis of Temporal Patterns of Air Pollution in Atlanta, GA and an Assessment of Measurement Error in Air Pollution Monitoring Networks in Atlanta, GA". Thesis, Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-08252005-141752/.
Texto completoMulholland, James, Committee Chair ; Russell, Armistead, Committee Member ; Tolbert, Paige, Committee Member.
Saraswat, Arvind. "Air pollution in New Delhi, India : spatial and temporal patterns of ambient concentrations and human exposure". Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/56224.
Texto completoScience, Faculty of
Resources, Environment and Sustainability (IRES), Institute for
Graduate
Gurram, Sashikanth. "Understanding the Linkages between Urban Transportation Design and Population Exposure to Traffic-Related Air Pollution: Application of an Integrated Transportation and Air Pollution Modeling Framework to Tampa, FL". Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/7030.
Texto completoMohammed, Nuredin Ibrahim. "Daily changes and short-term exposure patterns in time series studies of air pollution and acute health effects". Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6658/.
Texto completoPalm, Britta. "Pesticide use in rice cultivation in Tarapoto, Peru : usage patterns and pesticide residues in water sources /". Uppsala : Swedish University of Agricultural Sciences, Department of Environmental Assessment, 2007. http://epsilon.slu.se/10587693.pdf.
Texto completoTruluck, Timothy Francis. "Hospital admission patterns of childhood respiratory illness in Cape Town and their association with air pollution and meteorological factors". Master's thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/17402.
Texto completoThe aims of this study were (a) to examine the profile of hospital admissions for selected respiratory illnesses for two major hospitals in Cape Town, and (b) to analyse the association of such admissions with air pollution indicators and meteorological variables. The first part of the study investigated the admission patterns of coloured and African children under twelve years of age who were diagnosed as suffering from asthma or acute respiratory infections at two major teaching hospitals in Cape Town. Computerized hospital admission records covering the years 1988-1990 from the overnight holding wards of the Red Cross War Memorial Children's Hospital and Tygerberg Hospital were used to determine patterns with respect to diagnosis, gender, race, age and date of admission. During the three year study period, respiratory admissions at both hospitals accounted for 15 078 (47.3%) out of a total of 31 887 admissions. Acute respiratory infections accounted for 63.6% and asthma 37.4 % of these respiratory admissions. Two factors of interest were noted: (1) Considerably more males than females were admitted with both asthma and acute respiratory infections. (2) Asthma admissions to Red Cross Hospital among African children were proportionally much less than those of coloured children when compared to the proportions of admissions for acute respiratory infections. After removal of the seasonal effect, a multiple linear regression model was fitted to the data to determine the individual associations between admissions and ambient environmental variables. Significant associations were found between: (1) acute respiratory infections and oxides of nitrogen, soiling index, and temperature; (2) asthma and oxides of nitrogen (3) total admissions and soiling index, average temperature and minimum temperature (negative). The study concluded that despite generally low levels of air pollution in Cape Town, childhood respiratory admissions to Red Cross War Memorial Children's Hospital and Tygerberg Hospital were statistically significantly associated with some ambient air pollutants as well as temperature. However, given the nature of both the exposure and admissions databases, these results should be treated with caution. More representative site selections for air pollution monitors, as well as searching and controlling for possible confounding factors (i.e. indoor air pollution, parental smoking, overcrowding), would allow a better understanding of the current air pollution problem and the possible effects on the respiratory health of children in metropolitan Cape Town.
Speir, Cameron Lindsey. "Two Cost Analyses in Resource Economics: The Public Service Costs of Alternative Land Settlement Patterns and Effluent Allowance Trading in Long Island Sound". Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31154.
Texto completoThe objective the first analysis is to determine the cost to local governments of providing water distribution and wastewater collection services to alternative spatial forms of residential development. Components of spatial form are explicitly defined in terms of lot size, distance and tract dispersion. An engineering cost model is used to determine the water and sewer costs to three sets of hypothetical land settlement scenarios. Each set shows the effect of one component of spatial form on cost.
The results show that smaller lots, shorter distances between existing centers and less tract dispersion reduce public water and sewer costs. Lot size is found to have the most pronounced effect on water and sewer cost. Some policy options for reducing the public service costs associated with development are considered.
The objective of the second cost analysis is to analyze the cost implications of a nitrogen allowance trading system for wastewater treatment plants in Connecticut. Effluent allowance trading involves the transfer of pollution control responsibility between pollution sources. Effluent allowances are the right to discharge a given quantity of waste into the environment over a given time period. Allowance trading has been proposed as a way of reducing pollution control costs, encouraging innovative pollution prevention techniques and more quickly achieving water quality goals.
Long Island Sound, a major estuary in the northeastern United States, experiences chronically low dissolved oxygen levels. Excessive nitrogen loads from anthropogenic activities in the Sound watershed have been identified as the cause of the oxygen problem. The state of Connecticut is examining the possibility of introducing an effluent allowance trading system in order to reduce the cost of achieving required reductions in nitrogen discharge.
A linear programming model is used to predict trading outcomes and allowance prices. The total cost of achieving a nitrogen load cap is calculated under three administrative approaches. The first approach is a uniform reduction requirement where all plants are required to reduce discharge by the same proportion. The second approach is an administrative reallocation of waste load where a regulatory agency assigns control responsibility based on the agency's understanding of relative costs. The third approach is a flexible effluent allowance trading system. The results will show that a trading program offers cost savings over traditional regulatory approaches, demonstrate the potential for further cost savings from pollution prevention activities and estimate the cost savings that would result from including nonpoint sources in the overall nitrogen reduction strategy.
Master of Science
Correa, Cano María Eugenia. "Macroecological patterns of plant species and anthropogenic activities". Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/22975.
Texto completoHayn, Michael, Steffen Beirle, Fred A. Hamprecht, Ulrich Platt, Björn H. Menze y Thomas Wagner. "Analysing spatio-temporal patterns of the global NO2-distribution retrieved from GOME satellite observations using a generalized additive model". Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4499/.
Texto completoAlbalawi, Salem Mohammad S. "Daily air pollution levels and asthma : exploring the influence of time-activity patterns on personal exposure in Al Jubail industrial city, Saudi Arabia". Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3566.
Texto completoStendera, Sonja Johnson Richard K. "Spatiotemporal variability of chemistry and biota in boreal surface waters : a multiscale analysis of patterns and processes /". Uppsala : Swedish University of Agricultural Sciences, 2005. http://diss-epsilon.slu.se/archive/00000956/.
Texto completoThesis documentation sheet inserted. Appendix reproduces four papers and manuscripts co-authored with R.K. Johnson. Issued also electronically via World Wide Web in PDF format; online version lacks appendix.
Assaghir, Zainab. "Analyse formelle de concepts et fusion d'informations : application à l'estimation et au contrôle d'incertitude des indicateurs agri-environnementaux". Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2010. http://tel.archives-ouvertes.fr/tel-00587784.
Texto completoCarpenter, Evan S. "Identifying Cultural and Non-cultural Factors Affecting Litter Patterns in Hickory Creek, Texas". Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699896/.
Texto completoMpherwane, Salome Kedibone. "An investigation into the allozyme genetic variation patterns among populations of freshwater fish from different river systems of Southern Africa". Thesis, University of Limpopo (Turfloop Campus), 2011. http://hdl.handle.net/10386/910.
Texto completoSaleh, Nadja y Frida Jannebring. "Samband mellan medelhavskost, fisk- och skaldjursintag samt tjock- och ändtarmscancer : En litteraturstudie". Thesis, Uppsala universitet, Institutionen för folkhälso- och vårdvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-439646.
Texto completoBakgrund: Tjock- och ändtarmscancer är den tredje vanligaste cancerformen världen över. Tidigare forskning visar att ohälsosamma matvanor har en koppling som orsak till cancer och att det genom att förbättra kostvanorna är det möjligt att förebygga en tredjedel av alla cancerfall. Medelhavskost med sitt höga intag av fisk- och skaldjur anses vara en hälsofrämjande kost och kring medelhavskusten är det en minskad förekomst av dödsfall orsakade av cancersjukdom. En rapport av WHO visar att ca 1,5–2 % av alla cancerfall har kopplingar till kemiska föroreningar och de flesta vatten innehåller numera kemiska föroreningar. Syfte: Syftet med studien var att uppdatera kunskapsläget för samband mellan medelhavskost, dess intag av fisk- och skaldjur och tjock-och ändtarmscancer hos vuxna över 18 år. Metod: En litteraturstudie användes för att besvara syftet. Artikelsökningen skedde i PubMed där 12 artiklar valdes ut och klarade kvalitetsgranskningen. Resultat: Ett tvetydigt samband fanns mellan medelhavskost och förekomsten av tjock- och ändtarmscancer då forskningen inte var överens om huruvida det finns ett samband eller inte samt att det var en begränsad andel studier. Vissa studier menar att det finns ett signifikant samband medan andra menar att det inte finns något samband. Studien stärker till viss del sambandet mellan fisk- och skaldjurintag och förekomst av tjock- och ändtarmscancer där de som åt fisk enligt WHO´s nuvarande rekommendationer möjligen hade en minskad risk för tjock- och ändtarmscancer jämfört med de som åt antingen mer eller mindre. Slutsats: Mer forskning behövs inom området för att säkerställa eventuella samband.
Hall, Kimberlee K., Brian G. Evanshen, Kurt J. Maier y Phillip R. Scheuerman. "Application of Multivariate Statistical Analyses to Microbial Water Quality Parameters in Four Geographically Similar Creeks in Northeast Tennessee to Identify Patterns Associating Land Use to Fecal Pollution Sources". Digital Commons @ East Tennessee State University, 2008. https://dc.etsu.edu/etsu-works/2947.
Texto completoClyde, Gerard A. "Spatial and temporal patterns exhibited by select physicochemical and biological water quality parameters in Lake Texoma, Oklahoma and Texas". Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4628/.
Texto completoGuerrero, Viviana Vanesa Urbina. "Condições atmosféricas associadas à dispersão de poluentes nas cidades de São Paulo e Santiago". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/14/14133/tde-20042016-161502/.
Texto completoThis work aimed to analyze the favorable and unfavorable meteorological conditions for pollutant dispersion, especially ozone, at the Metropolitan Area of São Paulo (MASP) and the Greater Santiago (GS). Ozone concentration measurements from stations located in both urban areas were used to determinate the mean behavior, the number of standard air quality exceedances and the increase on nocturnal ozone concentration over a 10 years period. It was found that the diurnal maximum occurs around 14 local time in both urban areas, and that there is a diminishment tendency of the total cases of standard air quality exceedances during all period. A secondary maximum of ozone concentration was observed in MASP at night, which was not clearly seen on mean values over GS. By using the NCEP/NCAR Reanalysis data it was seen that the occurrence of this phenomenon is associated to specific synoptic patterns for GS, while there is no specific synoptic pattern for the MASP cases, with or without nocturnal increase in ozone concentrations. A New Photochemical Module (NPM), containing 95 reactions was coupled to BRAMS model in an attempt to improve the prediction of air pollutants, especially ozone. The NPM showed a better performance than the original module, the SPM (Simple Photochemical Module), for all considered pollutants but ozone. For this pollutant, the SPM presents better statistical indexes for 5 of the 7 stations analyzed. The local characteristics related to simultaneous occurrence of nocturnal ozone increase was studied using the SPM-BRAMS model, which showed that the secondary nocturnal maximum of ozone concentrations in MASP are related to vertical transport of this pollutant from higher levels of the atmosphere to the surface, while the horizontal transport is a major contributor to the increase of ozone concentrations in the GS during the night.
Fox, John Tyler. "Spatiotemporal Patterns and Drivers of Surface Water Quality and Landscape Change in a Semi-Arid, Southern African Savanna". Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/81462.
Texto completoPh. D.
Mansui, Jérémy. "Observation et modélisation des macro-déchets en mer Méditerranée, de la large échelle aux échelles côtière et littorale". Thesis, Toulon, 2015. http://www.theses.fr/2015TOUL0015/document.
Texto completoThe main objective of this work is to study the floating marine debris transport mechanisms and their potentialaccumulation in the Mediterranean Sea, using numerical modelling and in-situ observations of debris. Thetransport dynamics is analysed in terms of typical scales in the basin, from the large scale to the coastal andlocal scales.First, the analysis of a Lagrangian experience data set show the potential existence of non-permanent and largeretention areas (Mansui et al., 2015a). In a second stage, the coastal impact of a boundary current (the NorthernCurrent) and atmospheric forcings on the local distribution and stranding of floating marine litter has beenestimated (Mansui et al., 2015b, under revision), using an original set of data combining offshore sightings andbeaching surveys
Minot, Marceau. "Traits biologiques et facteurs environnementaux structurant les mouvements locaux et la dispersion des libellules( Insecta, Odonata) dans les réseaux de mares. Pond creation and restoration:: patterns of odonate colonisation and community dynamics Biometry of the large dragonfly Anax imperator (Odonata, Aeshnidae):: A study of traits from larval development to adults Effects of water pollution on the larval development and condition of the adults at emergence in Aeshna cyanea (Odonata: Aeshnidae) Habitat use and movements of a large dragonfly (Odonata: Anax imperator) in a pond network. Diversity and genetic structure of Anax imperator populations at the European scale". Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR031.
Texto completoDuring the last decades, the number of ponds decreased by more than 50 % in European countries, occasionally reaching up to 90 % in some regions. Their decline in number has led to a strong loss of connectivity between waterbodies. Yet, these small and scattered ecosystems are essential for the life cycle of a high diversity of freshwater species. Land use policies like the creation of Greenways and Blueways in France aim to improve ecological continuities to allow maintenance of existent biological populations and exchanges between them. However, the connectivity between ponds must be considered according to the dispersal abilities of freshwater species and this information often lacks to guide restoration measures. In the present work, we studied the dispersal abilities of dragonflies on several spatial scales and investigated the biological traits and environmental factors that shaped their movements. In the first part, we evaluated the colonization of 20 ponds in Normandy by dragonflies during three years after pond restoration or pond creation. The results highlight high colonization rates during the first year and no difference in species richness was found between newly created or restored ponds. This suggests that restoration of ponds after complete drought should not always be prioritized over pond creation in management strategies. We found that generalist species were more present in the first year after pond creation or restoration, whereas the occurrence of forest specialists increased with the age of the pond. The results also highlighted that the landscape context around ponds (i.e. forest vs. open lands) had an effect on the composition of dragonfly communities. Finally, the total abundance of odonate species was related to the density of other ponds in the surroundings. This result emphasizes that highly connected ponds can support larger populations than isolated ones and thus, be more resilient to perturbations. The second part provides insights into the larval development of Anax imperator and the relationship between morphological traits of larvae and adults. The results suggest that the survival of this species might depend on its body length during the maturation period. We also tried to study the natal dispersal by marking 87 individuals at emergence, but only two males were resighted after the maturation period. Finally, the effect of two water pollutants (i.e. Round-up and DEET) at different concentrations was also investigated on the larval development and adults of Aeshna cyanea. Larvae were reared under laboratory conditions and exposed to concentrations up to 30 mg.L-1 of the two pollutants. No effect of the pollutants was detected on the morphological conditions of larvae or tenerals, suggesting that A. cyanea is tolerant to potential water pollution of ponds. The level of HSP70 stress protein was also similar according to the different treatments, but teneral adults presented higher levels of stress than larvae, suggesting that emergence induced a high stress in the individuals. The third part focuses on the dispersal of A. imperator. We first assessed the local movements within a pond network in the Normandy region
Gineste, Benoit. "Étude de la biologie et de la vulnérabilité au développement anthropique des oiseaux marins nocturnes à La Réunion". Thesis, La Réunion, 2016. http://www.theses.fr/2016LARE0015/document.
Texto completoThe biodiversity is currently threatened by human activities. As they depend both of marine and terrestrial habitats, seabirds are particularly exposed to human pressures. In Reunion Island, the consequences of the urbanization on populations are unknown. For conservation and environmental assessment purposes, accurate information on the species repartition, flight patterns and vulnerability to infrastructure is required. The goals of this thesis are to update biological information on species and to assess the vulnerability of nocturnal seabirds of Reunion Island exposed to infrastructure. We studied the evolution of the size and the repartition of the colonies of tropical shearwater Puffinus bailloni at the scale of the entire island over a 19-years period. The flight patterns of tropical shearwater and Barau's petrel Pterodroma baraui were described with radar technology at different spatial and temporal scales. Our results show an apparent stability of the tropical shearwater population despite an important light pollution. Tropical shearwater and Barau’s petrel present specific flight patterns. The estimated census of Barau's petrel suggests a population size higher than current estimation whereas the estimated census of tropical shearwater is reliable to current estimations. Barau's petrels' juveniles mostly take off during the first hours of the night. Decision making tools have been produced. Our study also highlights the need to conduct further fundamental and applied researches
Wu, Yu-ping y 伍玉平. "The Analysis of Air Flow Pattern For Pollution Control". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/53561244085727739161.
Texto completo國立中山大學
機械與機電工程學系研究所
90
In recent years, the demand for higher cleanliness and air quality control of the indoor environment is increasing especially during the manufacturing process. Although different design standards and codes were adapted worldwide, the air flow pattern analysis still dominates the design process. The parameters affecting the design process were cross-examined, including the air change rate, clean room sizes and layout, air supply and exhaust ports layout, unbalanced supply and exhaust air volume (QR=1.2QS), until system optimization is achieved. Furthermore, FFU system with 0.46m/s air speed was identified to be appropriate for injection module designs. In order not to increase manufacturing cost, the FFU can be design with three-fiered speed control to provide energy efficiency with space flexibility. However, in low-speed operation, the slightly positive pressure cannot be maintained properly and should be avoided to operate in unconditioned rooms.
Ho, Sheng-Wei y 何勝惟. "Multivariate Analysis of Soil Heavy Metal Pollution and Land Use Pattern in Taiwan". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/40938447747739756301.
Texto completo國立臺灣大學
生物環境系統工程學系暨研究所
90
Factor analysis and landscape indices were used to find out the relationship between the land use and soil heavy metal pollution in Tao-Yuan, Hsin-Chu, Chang-Hua, and Kao-hsiung. The study revealed that soil heavy metal and landscape patterns could be grouped into the factor model that account for all of the variation. A landscape pattern is a mixture of natural and human-managed patches that vary in size, shape, and arrangement, and result from complex interactions of physical, biological, and social forces. The following landscape indices for each sampling site were used to characterize landscape patterns and land use including; Shannon Weaver Diversity Index (SDI), Area-Weight Mean Shape Index (AWMPFD), density of irrigation ditches (DL), the ratio of urban planning area (RAup), Nearest Neighbour Index (R) and number of plants. Semiconductor Manufacturing and Printed Circuit Board are the most important industries in Tao-Yuan and Hsin-Chu areas, wastewaters discharge are the major reason for soil pollution. Fragmentation caused by urbanization and industrialization in Chang-Hua is the main reason of soil pollution in this region.
Hong, Jia-Hong y 洪嘉宏. "Analysis of Air Flow Pattern and Pollution Control in the Mini-Environment of Injection Molding Clean Room". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/28855246120235118012.
Texto completo國立中山大學
機械與機電工程學系研究所
91
High technology industries have stringent on clean room environment. Traditional ballroom type clean room can’t meet the requirement in many cases. The uni-directional laminar ballroom type cleanroom is can’t fulfill such requirement. The adoption of Mini-Environment technology is becoming the mainstream of the environment control technology for high technology industries process. It is the goal of this project to simulate and design the air flow pattern, in using the current injection machine as a model, to achieve the cleanliness of class 1,000 – 10,000. There are four major steps in achieving this goal, Namely: 1、The dynamic 3D CFD simulation of the flow pattern of the clean bench. 2、The evaluation of the pollution source and its impact on the overall cleanliness 3、The basic design of the class 1,000 cleanroom for this machine 4、The modification necessary to achieve this goal through design iterations. The results of this research are useful in the understanding of the flow characteristics in a mini-environment. The buffer zone of laminar flow was found to be effective to avoid cross contamination with the outside environment during door opening. The height of the processing opening of the mini-environment is found to be an important factor on the flow turbulent intensity and particle concentration. Concentration due to an operator can also be reduced by this buffer zone. The numerical techniques developed can also be used as numerical models in future studied.
DI, CHIO ROBERTO. "Theoretical and Practical Aspetcts of the Catalytic Pattern of Nanostructured MnCeOx Systems for Environmental Applications". Doctoral thesis, 2018. http://hdl.handle.net/11570/3131264.
Texto completoMagerman, Ruben Clive. "Effects of an argumentation-based instruction on grade 10 learnersâ understanding of the causes of pollution at a river site". Thesis, 2011. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3465_1319195566.
Texto completoMohamed, Mostafa H. A. y R. S. Sharma. "Patterns and mechanisms of light non-aqueous phase liquid in unsaturated sand". 2003. http://hdl.handle.net/10454/2676.
Texto completoThe paper presents patterns and mechanisms of light non-aqueous phase liquid (LNAPL) migration in an unsaturated/saturated sand, based on a detailed experimental investigation using a fully instrumented two-dimensional model with dimensions of 120 x 120 x 10 cm. Suction head and degree of saturation were monitored simultaneously using tensiometers and time domain reflectometry (TDR) transducers respectively. LNAPL spills into the unsaturated zone were simulated to investigate the influence of new variables of practical importance, including the spill area, volume of spill and fluctuations of groundwater table, on the patterns of LNAPL migration. The patterns are explained in terms of the relationship between matric suction and degree of saturation. Fluctuations of water level are found to have a major influence on the distribution of LNAPLs in the unsaturated/saturated sand for large volumes of LNAPL spill. Measurements of degree of saturation of water at different levels are used to explain the LNAPL migration. It was found that water suction head was not affected by migrating LNAPL if the degree of saturation of water was above the residual saturation. Results of LNAPL suction head were found to be consistent with the migration patterns. Additionally, the average suction head difference between different levels indicated accurately the direction of LNAPL migration, which was in good agreement with the patterns observed using electronic imaging.
Gilbreath, Yvonne Janiece. "Shifting pollution patterns in the production of refined oil products and industrial chemicals under NAFTA". 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3099450.
Texto completoGaumnitz, Lisa Lynn. "Science frames and informational patterns a content analysis of newspaper coverage of an air pollution reduction program /". 1993. http://catalog.hathitrust.org/api/volumes/oclc/33099241.html.
Texto completoTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 61-64).
Fowles, AE. "Assessing anthropogenic impacts on reef communities: patterns, indicators and processes". Thesis, 2017. https://eprints.utas.edu.au/23842/1/Fowles_whole_thesis.pdf.
Texto completo"Spatiotemporal Patterns, Monitoring Network Design, and Environmental Justice of Air Pollution in the Phoenix Metropolitan Region: A Landscape Approach". Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.25096.
Texto completoDissertation/Thesis
Ph.D. Biology 2014
Roffe, Sarah Jane. "An investigation into the spatio-temporal patterns of modelling SO2, NOx and surface O3 across the Highveld priority area, South Africa". Thesis, 2017. http://hdl.handle.net/10539/23542.
Texto completoThe Highveld is identified as an air pollution ‘hotspot’ area where pollutant concentrations are elevated due to the high density of industrial and non-industrial air pollution sources. To enhance air quality across the Highveld, it was declared a priority area to manage and monitor pollutants to reduce their negative impact on the environment and society. Hence, the aim of this study was to investigate ambient air pollution across the Highveld Priority Area (HPA), using ground-level SO2, NOx and surface O3 concentrations, meteorological parameters and Moderate resolution imaging spectroradiometer (MODIS) atmosphere products, for January to December 2011, to develop new modelling techniques to aid in the management of air pollution. Results show the annual mean trace gas concentrations of SO2, NOx and surface O3 were 12.14, 14.75 and 28.77 ppb, respectively. SO2 and NOx concentrations were highest during winter at an average of 17.56 and 20.96 ppb, where surface O3 concentrations were highest during spring at an average of 32.82 ppb. Diurnal patterns of SO2 and surface O3 were similar, where a midday peak occurred. NOx concentrations instead showed peaks during traffic hours. Ambient air temperature, solar radiation, relative humidity, wind speed and rainfall levels peaked during summer. Atmospheric pressure was relatively stable throughout the year. Winds typically ranged from N to E up to April and from S to NW from May. Very little variation in SO2 and NOx concentrations was explainable by meteorology, 4 to 29 % and 5 to 23 %, while the influence of meteorology on surface O3 concentrations was more significant, 23 to 53 %. Spatial multiple regression statistical models using a cross validation approach for model validation were made over a number of temporal scales. The model fitting and validation processes indicated that the models were not a good fit as only up to 69, 74 and 58 % of SO2, NOx and surface O3 concentrations with high root means square error (RMSE) values of up to 22.10, 15.56 and 18.59 ppb, respectively, could be explained by the models. This process revealed the potential to model pollutants across the HPA, and as a pilot study future work can be based on this study. It is clear that spatial modelling for pollution estimation and management is necessary as seen by the frequent exceedances of the national and international ambient air quality standards.
XL2017
Brauer, Michael, Jochen Brumm y Stefanie Ebelt. "Evaluation of ambient air pollution in the Lower Mainland of British Columbia: Public health impacts, spatial variability, and temporal patterns". 2000. http://hdl.handle.net/2429/875.
Texto completoJohn, Juanette. "Lead exposure of children attending pre-school facilities in certain geographical areas of Pretoria, in relation to their activity patterns : a cross-sectional study". Diss., 2003. http://hdl.handle.net/2263/28025.
Texto completo"Determining the influences of land use patterns on the diatom, macroinvertebrate and riparian vegetation integrity of the Lower Harts/Vaal River systems". Thesis, 2010. http://hdl.handle.net/10210/3268.
Texto completoWater resources in South Africa are scarce and need to be protected and managed in a sustainable way for future generations. Food supply is a great priority worldwide and the pressure to produce enough food has resulted in the expansion of irrigation and the steadily increasing use of fertilizers and pesticides to achieve higher yields. Rivers are impacted by agriculture through increased suspended sediment loads (which affects primary production, habitat reduction and introduction of absorbed pollutants), elevated nutrient inputs (which may increase the abundances of algae and aquatic plants), salinization and pesticide runoff (which eliminates species intolerant to these conditions and therefore impacts on the normal production of the river system). Aquatic biota plays an integral part in the functioning of aquatic ecosystems. Biological monitoring is used to assess ecosystem health and integrity. Biological communities reflect the overall integrity of the river ecosystem by integrating various stressors and therefore provide a broad measure of their synergistic effects. The research area falls within the Lower Vaal Water Management Area (WMA), which lies in the North-West and Northern Cape Provinces. The lower Vaal River and the Harts River (one of the tributaries of the Vaal) are the river systems under investigation in this study. Farming activities ranges from extensive livestock production and rain fed cultivation to intensive irrigation enterprises at Vaalharts (such as maize, cotton and groundnuts). The Vaalharts is the largest irrigation scheme in South Africa. Salinity is of concern in the lower reaches of the Harts- and Vaal Rivers, due to saline leachate from the Vaalharts irrigation scheme. Agricultural inputs are known to affect aquatic communities and chemicals (e.g. pesticides, herbicides, fertilizers) are extensively used in the Vaalharts irrigation scheme. At present there are no data on the effect of these chemicals on the aquatic biota of the lower Harts- and Vaal Rivers. The aims of this study were to assess the diatom- and macroinvertebrate community structures, ecosystem integrity and macroinvertebrate feeding traits (functional feeding groups – FFGs) in relation to land use.