Dissertations / Theses on the topic 'School of Chemical and Physical Sciences'
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Holm, Sandra, and Ahlbin Mimmie Jönsson. "Naturvetenskap och estetik i förskolan : fysikaliska förändringar och upptäckande av vätskor med barn i förskolan." Thesis, Högskolan Kristianstad, Fakulteten för lärarutbildning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-21724.
Full textÖman, Sotterman Lars. "Undervisning i källkritik i grundskolans NO-ämnen åk 7–9 : En tematisk studie." Thesis, KTH, Lärande, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301171.
Full textThe purpose of this thesis is to investigate how science teachers in compulsory school, preferably chemistry, but also biology and physics, in their practice conduct teaching about source credibility to meet the curriculum's goals and knowledge requirements in this area. The study has been based on recorded qualitative semi-structured interviews of eight teachers active in primary school. The results have been produced through thematic analysis and describe how the teachers teach source criticism in the science subjects, as well as the capabilities that the teachers believe the students need to be able to benefit the teaching ofsource credibility. Source credibility is mainly treated as an aspect of ordinary teaching, for example in connection with various statements or questions that students address based on information they have taken part in in the public debate or in various discussion forums is mainly treated as an aspect of the usual teaching. The teachers then discuss with the pupils which factors make information credible. The teachers also describe that it is important in the teaching to emphasize that the credibility of scientific statements depends on the statement being supported by the scientific methods used in the development and that the statement has been reviewed by subject matter experts. The teachers in this study describe that the most important capability for students to critically review information with a scientific content is their knowledge of the various NO subjects. Another important capability is that students understand how to use search engines on the Internet to be able to find independent sources. The risk is otherwise that they end up in a so called search bubble and they do not receive relevant information.
Grewal, Burrinder S. "Mechanisms of chemical and physical transdermal penetration enhancement." Thesis, Aston University, 1999. http://publications.aston.ac.uk/10978/.
Full textMahama, Wundow. "High school learners’ attitudes towards physical sciences." Thesis, University of Zululand, 2018. http://uzspace.unizulu.ac.za:8080/xmlui/handle/10530/1639.
Full textThe investigation of high school learners’ attitudes towards physical science has been one of the prominent areas of research for the science education research community globally for some time now. However, its current importance in South Africa is emphasised by the mounting evidence of poor performance in physical science at matriculation level. Consequently, identifying the nature of learners’ attitudes towards physical science, and promoting favourable attitudes towards physical science is increasingly a matter of concern. The present study therefore investigated high school learners’ attitudes towards physical science and the relationship between their attitudes and learners’ biographical data such as gender, age and grade level. Both systematic and stratified sampling techniques were used to select a sample size of 298 respondents from five high schools in the Nongoma circuit in KwaZulu-Natal province of South Africa. The research was based on descriptive research design to obtain information from respondents in their natural environment through the use of adopted attitude scale. Permission was sought and obtained through email to use the attitude scale. Descriptive and inferential statistics were used to present and analyse the data. The findings from the present study suggest that majority of high school learners hold positive attitudes towards physical science. Findings with regard to the relationship between learners’ attitudes and their biographical data reveal that there is no association between attitudes and learners’ biographical data such as gender, age and grade level. The findings from this study will add value to education policy pertaining to science education in the country. It will also contribute to the theory of attitudes towards physical science. However, there is a need in future to study ways of encouraging learners to have positive attitudes towards physical science.
Brooker, Michael R. "Physical and Chemical Characterization of Self-Developing Agricultural Floodplains." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1513778530623727.
Full textYimamu, (Imam) Maiwulidan (Mewlude). "Chemical vapour deposition of boron-carbon thin films from organoboron precursors." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123909.
Full textGerothanassis, I. P. "Application of a DSc in the School of Chemical Sciences." Thesis, University of East Anglia, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539366.
Full textChen, James. "In-situ study of the chemical composition of photochromic Yttrium Oxy-Hydrides thin films." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-389390.
Full textAmini, Tina. "Chemical and physical methods of enhancing the percutaneous absorption of antimicrobial agents." Thesis, Aston University, 2001. http://publications.aston.ac.uk/10994/.
Full textDemyan, Michael Scott. "Chemical and Physical Changes in Twenty Five Year-Old Minesoils in Southeast Ohio." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1419259892.
Full textBarnett, Tracie. "Predictors of physical inactivity among elementary school children." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37089.pdf.
Full textPoirier, Phillip A. "Physical and chemical correlates of Sacramento County vernal pool crustaceans." Scholarly Commons, 2012. https://scholarlycommons.pacific.edu/uop_etds/801.
Full textKalmoni, Iman. "Extraction and determination of chemical and physical properties of antimicrobial compounds from a Swedish mushroom." Thesis, Umeå universitet, Kemiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-137294.
Full textDowell, Richard Marshall. "School Administrator Impact Upon Physical Restraints in Public Schools." Youngstown State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1403081916.
Full textLagacé, Pascale. "Physical-chemical treatment of TMP-newsprint mill effluent as a closed cycle technology." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26398.
Full textThe subject of this research was to develop a physical-chemical process that would be suitable for the treatment of TMP-Newsprint effluent as a closed cycle technology.
A mixture composed of 80% TMP cleaner rejects, 10% contaminated condensate from the heat recovery and 10% chip wash water was used to approximate the effluent from a very low water usage mill.
Preliminary experiments were performed using lime, magnesium oxide, activated carbon, potassium phosphate and alum. The most promising treatment identified was using a combination of magnesium oxide, lime and potassium phosphate. It was found that 300 mg/L of MgO, 1000 mg/L of CaO and 500 mg/L of KH$ sb2$PO$ sb4$ gave over 90% extractives removal, a reduction of 60% in colour and 75% in turbidity, while maintaining a low water hardness. It was also found that MgO addition was not required at the dosages used.
Tests were also performed on effluent with an elevated level of inorganic dissolved solids that would be typical of a closed cycle mill. It was found that higher dosages of lime would be required, and that potassium phosphate would no longer be necessary.
The results of this study have shown that there is great promise in using a physical-chemical process as part of a closed cycle treatment scheme.
Montreuil, Richard. "High school sports: The perspectives of the school principals." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27537.
Full textGowda, Vasantha. "Experimental and Computational Magnetic Resonance Studies of Selected Rare Earth and Bismuth Complexes." Doctoral thesis, Luleå tekniska universitet, Kemiteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65378.
Full textSandoval, Kathia a. "Physical and Chemical Characterization of Crude Oil-Water Mixtures: Understanding the Effects of Interfacial Process to Chemical Bioavailability." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2464.
Full textWilliams-Jones, Leigh-Ann. "A chemical and thermal modelling study of the active layer on Herschel Island, Yukon Territory." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114312.
Full textUne condition essentielle pour évaluer les impacts potentiels du réchauffement climatique dans les régions polaires est l'acquisition d'une meilleure compréhension de la nature et du comportement de la couche active du pergélisol. La recherche présentée dans cette thèse est présentés sous la forme de deux manuscrits. Le premier manuscrit examine le rôle des processus chimiques dans le régime d'altération du sol sur l'île Herschel. Trois couches distinctes cryostratigraphiques ont été observées dans les profils de sol: (1) la couche active moderne située immédiatement sous la surface du sol (0 - 39 cm), (2) la couche paléo-active (couche de transition) s'étendant de la base de la couche moderne active à la partie supérieure de la couche de pergélisol non perturbée (39 - 192 cm) et (3) le pergélisol sous-jacent. Ces couches sont marquées par deux discordances de dégel séparant la couche active moderne de la couche de transition et la couche de transition de la couche de pergélisol, respectivement. Ces deux discordances de dégel ont été identifiées grâce à la présence de ruptures brutales dans la texture cryogénique et par des pics dans la concentration de plusieurs composants chimiques. La discordance de dégel supérieure, située à la base de la couche moderne active, coïncide avec un doublement de la concentration des principaux cations solubles et un triplement de la teneur en matière organique par rapport aux horizons sus-jacents. La discordance de dégel inférieure est marquée par la plus forte concentration en Al2O3 et en K2O de l'ensemble du profil et par la deuxième plus forte concentration en Na2O. Entre ces deux discordances, les concentrations en cations solubles varient considérablement, la concentration en SiO2 du sol brut s'accroit de façon significative et on observe une diminution notable des concentrations en Al2O3, Fe2O3, CaO, MgO et K2O dans l'intervalle de profondeur de 82-107 cm. Les indices d'altération chimique ont enregistré une diminution globale de l'intensité de l'altération chimique avec la profondeur ; les couches de sol immédiatement au-dessus de la première discordance de dégel sont les plus altérées et la couche profonde du pergélisol est la moins altérée.Le second manuscrit utilise un algorithme de conduction de la chaleur basé sur la composition et les propriétés thermiques des sols examinés au chapitre 3 et sur les mesures des valeurs de profondeur de la couche active afin d'évaluer le transfert de chaleur de la surface du sol au pergélisol sous-jacent. Des constantes thermiques (la racine carrée du rapport entre deux fois la conductivité thermique du sol non gelé et la chaleur latente de fusion de la glace) ont été calculées en utilisant la méthode de De Vries et comparées aux constantes thermiques empiriques issues des mesures de profondeur de la couche active et des degrés-jours de dégel correspondant en utilisant l'équation de Stefan. Les constantes théoriques sont environ 38% inférieures à celles obtenues empiriquement, une différence qui s'explique probablement par le fait que l'équation de Stefan ne considère pas le transfert de chaleur par advection et que les profondeurs de la couche active ont probablement été surestimées en raison de la méthode de mesure (résistance à la pénétration d'une sonde métallique). La troisième génération du modèle couplé climatique global canadien (CGCM 3.1/T63) du Centre canadien de la modélisation et de l'analyse climatique (CCmaC), basée sur les scénarios A2 et B1 du IPCC SRES, a été utilisée en conjonction avec les constantes thermiques théoriques et empiriques pour prédire les profondeurs de la couche active pour 2050 et 2100. Ces calculs suggèrent que la couche active s'épaissira de jusqu'à 41,76% avant la fin du siècle.Ce mémoire apporte un nouvel éclairage sur le rôle important que les couches actives et de transition jouent dans le contrôle de la réponse des systèmes de pergélisol au changement climatique.
NOKURA, KENJI. "Real time monitoring of surface chemical events by streaming potentials in microfluidic channels." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3299.
Full textBooth, Bryan C. "An Investigation of the Effects of Chemical and Physical Weathering on Submerged Karst Surfaces." Thesis, University of South Florida, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3740302.
Full textReports an investigation of the effects of chemical and physical weathering on submerged karst surfaces that pairs laboratory studies with computer modeling studies. The first study attempts to quantify the production of carbonate fines; soluble sediments produced by the incomplete dissolution of karst minerals during chemical weathering. Results show carbonate fine production in relation to dissolutional action; Chalk: 42.8%; Coquina: 2.6%; Dolomite: 3.1%; Gray Limestone: 4.8%; Ocala Limestone: 3.1%; Shell Limestone: 6.1%; Travertine: 8.6%. Due to the use of hydrochloric acid as opposed to carbonic acid these results may not be fully valid for application to natural speleogenic processes. The Limestone Weathering Model, a numerical-computer model, was developed using these experimental findings as minimal values compared with published rates. Reported as the actual volume of rock mass lost to both dissolution and to carbonate fine production, the rates for carbonate fine production ranged from 5.8% to 10.9% (year 1-5.8%, year 2-8.5%, year 3-9.7%, year 4-10.3%, year 5-10.9%), with a mean value for carbonate fine production of 9%, but a continuing rate after five years approaching 11%. The second study uses metrological laser scanning to measure the erosive loss due hydraulic shearing force and corrasion on submerged limestone surfaces. The rates for material removed using increasing velocity values (0.3m/s, 0.5m/s, 1.0m/s, 1.5m/s, 2.0 m/s, 2.5m/s) during flow durations of less than 6 minutes duration were : 1) Hydraulic shearing force- 0.3µm/s, 0.5µm/s, 0.4-1.7µm/s, 2.5 µm/s, 5.5 µm/s, 2) Corrasion- 0.3 µm/s, 0.7 µm/s, 1.5 µm/s, 1.5-1.8 µm/s, 8.9 µm/s, 8.1 µm/s. The study model was modified to return these rates for hydraulic shearing force limited by the depth of the chemical corrosion of the surface. The model returns % rock volume lost to hydraulic shearing force compared to dissolutional rate (1mm/y) for 3 flow velocities (0.03m/s<, 1.0m/s<, 2.5m/s<) on 4 timing schedules: Annual- 7.8,14.3,19.6, Semiannual- 21.1,21.1,69.7, Quarterly- 32.8,43.6, 70.9, Monthly- 80.0, 109.3, 200.3. Model demonstrates significant effect (7.8% to 200% over dissolutional rate) on speleogenic rates from even infrequent, moderate changes in flow velocities due to storm events. Investigation’s results support the significance of chemical weathering by disaggregation and physical weathering by hydraulic shearing force as major factors in the processes of karst speleogenesis.
Simon, Zoé. "Design of a lensless imaging system in the mid-IR range for generation of chemical images of histological samples." Thesis, KTH, Tillämpad fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235474.
Full textLohse, Peter A. (Peter Andreas). "Distribution of knowledge production in the chemical sciences in the US." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65786.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 43-44).
A citation analysis was carried out to gain an understanding of the geographical and institutional distribution of highly cited articles in the chemical sciences in the US over the last thirty years. The contribution of US chemistry departments was determined by quantifying the number of highly cited articles published by individual authors or groups of authors from the same department. Articles stemming from collaborative research across schools were not considered. The results show that a dilution in intradepartmental knowledge production has occurred both on a geographical and institutional level. Three chemistry departments have emerged as strong producers of high impact articles over the last thirty years: the University of North Carolina, Texas A&M University and the University of Utah. In terms of aggregate numbers of highly cited articles these three schools are in the top ten of over seventy schools which were evaluated; their chemistry departments are en par in terms of scientific impact with those from Ivy League schools like Stanford University, Harvard University and the California Institute of Technology. While the literature reports increasing concentration for the US research base, the present analysis shows a dilution in chemical knowledge production when collaborative efforts across departments and schools are excluded. This finding suggests that the increase in concentration in the US science base is not a uniform trend when studied on a more granular level.
by Peter A. Lohse.
M.B.A.
Parks, Krystyn. "Nutrition and physical activity curriculum for before and after school daycares." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1528021.
Full textThe purpose of this project is to create fun and educational lesson plans for before and after school childcare providers of children in kindergarten through fifth grade. The lesson plan will incorporate aspects of physical activity and nutrition into the basic curriculum for this age group. The nutrition and physical activity curriculum contains four themed weekly lessons. Each lesson incorporates a nutrition discussion, an activity related to the discussion, and one group game. The lessons and activities were designed to incorporate minimal materials so that any facility could easily incorporate them. A committee of nutrition professionals and educators reviewed the curriculum and improvements were made based on their recommendations.
Myrdal, Paul Brian. "A simple scheme for estimating environmentally relevant physical properties of organic compounds." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186674.
Full textGuzman, Veloso Viviana. "Physical and Chemical Conditions in the Horsehead Photodissociation Region." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00950116.
Full textSpencer, David Lowell. "Physical and Chemical Properties of a New Mineral Trioxide Aggregate Material." VCU Scholars Compass, 2004. http://scholarscompass.vcu.edu/etd/647.
Full textCampbell, Alex E. "Chemical, physical and mineralogical properties associated with the hardening of some South African fly ashes." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/19250.
Full textNaini, Venkatesh. "Physical and Chemical Stability of Spray Dried Sugars and Protein-Sugar MolecuIar Mixtures for Inhalation." VCU Scholars Compass, 1996. http://scholarscompass.vcu.edu/etd/4982.
Full textBoza, Arauz Andrea. "Evaluation of Chemical, Physical, and Sensory Properties of Tortillas Prepared from Nixtamalized Oats." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/9058.
Full textToerien, René. "Mapping the learning trajectories of physical sciences teachers' topic specific knowledge for teaching chemical bonding." Doctoral thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25508.
Full textBotello-Ruvalcaba, Martin Armando. "Physical, chemical, biological and management aspects of coastal ecosystems facing eutrophication : the Guaymas Bay, Sonora, Mexico." Thesis, University of Hull, 1999. http://hydra.hull.ac.uk/resources/hull:16865.
Full textFew, Julian William. "FTIR studies of chemical processes." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:b7dbc587-fb9e-46de-8f04-44892fde0bf4.
Full textGao, Min. "CHEMICAL CHARACTERIZATION OF SOIL ORGANIC MATTER IN AN OLIGOTROPHIC, SUBTROPICAL, FRESHWATER WETLAND SYSTEM: SOURCES, DIAGENESIS AND PRESERVATION." FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/3625.
Full textGao, Min. "Chemical characterization of soil organic matter in an oligotrophic, subtropical, freshwatwer wetland system : sources, diagenesis and preservation." FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/3618.
Full textHuynh, An Ngoc Hiep. "Evaluating UVB and UVA Boosting Technologies for Chemical and Physical Sunscreens." University of Toledo Health Science Campus / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=mco158889865268024.
Full textBelcher, Kelly Leigh. "Evidentiary Value of Condoms: Comparison of Durable Physical and Chemical Characteristics of Condoms." Thesis, University of North Texas, 2000. https://digital.library.unt.edu/ark:/67531/metadc2481/.
Full textGray, Martha Lane. "Physical regulation of epiphyseal cartilage biosynthesis : responses to electrical, mechanical, and chemical signals." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/17205.
Full textMICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.
Bibliography: leaves 194-205.
by Martha Lane Gray.
Ph.D.
Shore, Stuart Mitchell. "The H.Y.P.P.E. Initiative: A School-Based Physical Activity Promotion Program." Diss., Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/68297.
Full textPh.D.
Physical activity promotion in schools is a critical component of adolescent health. The main purpose of this study was to test the efficacy of a school-based program to increase the physical activity of 6th grade students. A total of 113 students in a large suburban public middle school participated in the 11 week study. A quasi-experimental design was used. Physical education (PE) classes served as the unit of randomization. Six PE classes were assigned to the control condition and six PE classes to the experimental condition. Control group students were asked to wear unsealed pedometers throughout the day in school and at home and to record their daily step-counts in school. Experimental group students also wore unsealed pedometers throughout the day and logged their daily step-counts in school, but additionally received a 10,000 step per day goal, were asked to attain an increased step-count goal during PE class, and received an enhanced PE curriculum. Pre- and post-test data were gathered for all dependent measures including average daily step-counts by week, GPA, attendance, tardiness, attitude and self-efficacy toward physical activity, and Presidential Physical Fitness Tests. The data analysis was completed using analyses of variance (ANOVAs), analysis of covariance (ANCOVA), paired sample t-tests, and independent sample t-tests. Results revealed significant gains in physical activity for both treatment conditions. Both groups demonstrated significantly increased step-counts relative to their baseline step-counts. The intervention did not produce significant changes in attitude or self-efficacy. There were some significant improvements in physical fitness and the scholastic measures, but these changes were not attributed to the intervention. Very low attrition, a high compliance rate, and favorable participant feedback were also noted. Overall, this study revealed that, in the short-term, it is possible to significantly improve physical activity without changing an adolescent's self-efficacy or attitude. An important finding of this study was that multi-faceted self-monitoring was the most critical factor that contributed to increased physical activity.
Temple University--Theses
Alhammad, Khalid Sulaiman. "Designing, implementing and evaluating a teaching sequence about physical and chemical change for Saudi school students aged 15-16." Thesis, University of Leeds, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595672.
Full textWanli, Hadia. "Matematik i förskolan / Mathematics in Pre-school." Thesis, Malmö högskola, Lärarutbildningen (LUT), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-27789.
Full textBassolino, Giovanni. "Tuning ultrafast chemical reaction dynamics in photoactive proteins." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:42c19c5c-c6df-48e9-bb1c-8a7098eca8b4.
Full textLuque, Carolina E. "Evaluating a Peer-Implemented Intervention for Increasing Physical Activity During School Recess." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7332.
Full textCassity, Kelby Brandan. "CHEMICAL MODIFICATION AND CHARACTERIZATION OF CARBON NANOTUBES." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/73.
Full textSpeers, Jimmy D. (Jimmy Dale). "Motion Versus Non-Motion in Interactive Video Lessons in High School Physical Science." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc279141/.
Full textZetréus, Emma, and Moa Olsson. "To design security : A quantitative study of high school students security in the physical school environment." Thesis, Högskolan i Halmstad, Akademin för lärande, humaniora och samhälle, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40085.
Full textWinchester, Geoff. "Understanding How High School Teacher-Coaches Learn to Coach." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28759.
Full textNdi, Cornelius Ndi. "Synthesis of Chemical Models of Hydrolase Enzymes for Intramolecular Catalysis." Digital Commons @ East Tennessee State University, 2011. https://dc.etsu.edu/etd/1356.
Full textRoy, Choudhury Adarsh. "Defining Black: Characterization of Soot Reactivity with Thermogravimetrical Methods : Definiera svart: Karaktärisering av sotreaktivitet med termogravimetriska metoder." Thesis, KTH, Tillämpad fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287478.
Full textAvgasutsläpp i ett fordon måste strömma genom avgasefterbehandling i ett dieselfordon. I en dieselmotor behandlas avgasutsläppen med dieseloxidationskatalysator (DOC), dieselpartikelfilter (DPF) och selektiv katalytisk reduktion (SCR). Varje motor producerar olika typer av sot beroende på körcykeln. I denna avhandling gjordes en undersökning av sotoxidationen i DPF för att minska nettobränsleförbrukningen och därmed optimera motorn. Detta projekt fokuserar på DPF, där sot och aska fångas på filterväggarna när utsläppen flyter genom dieselpartikelfiltret. Under en tidsperiod ackumuleras sot och får trycket inuti filtret att öka. För att minska mottrycket på grund av sotansamling måste sot avlägsnas från filtret, vilket görs genom en regenereringsprocess där sot oxideras. För att förstå sotoxidationen i DPF studerar vi sotens kemiska kinetik. Sotet reagerar med NO2, O2 och N2 i ett instrument för termogravimetrisk analys (TGA) under isotermiska förhållanden. Två sotprover, SORT-1 och FORCED 360 analyserades med TGA, hastighetsekvationerna härleddes från användning av Arrhenius-typskinetik och data bearbetades av MATLAB. Den hastighet med vilken sot oxideras av NO2 och O2 för SORT-1 är högre än för FORCED 360. Denna trend observeras på liknande sätt när båda sotproverna reagerar med endast O2. När reaktion genom sotoxidation äger rum med O2 och NO2 kräver de en lägre temperatur på 250 ° C - 400 ° C än jämfört med prover som bara reagerar med O2 med en temperatur på 350 ° C - 500 ° C. För att förstå de förhållanden som påverkar sotoxidation varierades syrekoncentrationen och det visade sig att vid högre syrekoncentration var sotet oxiderat nästan konstant. Därefter analyserades sotkinetiken genom att hitta reaktionshastigheten, reaktionsordningen och slutligen aktiveringsenergin. Reaktionsordningen för FORCED 360 och SORT-1 varierar och lutningen i diagrammet, logaritmen för reaktionskonstanten mot logaritmen av massan visar en icke-linjäritet i den tidigare på grund av den långsammare reaktionshastigheten i SORT-1 än i FORCED 360. Aktiveringsenergin konstaterades vara 39,3 kJ / mol för SORT-1 och för FORCED 360, 60,8 kJ / mol.
"Chemical vapor sensing, luminescence pH sensing, solvatochromism and photoisomerization of phenylene-vinylene derivatized terpyridine molecules." Tulane University, 2008.
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