Dissertations / Theses on the topic 'Iron content'
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Kochan, Mucahit. "Information Content of Iron Butterfly Arbitrage Bounds." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955071/.
Full textMann, Georgianna Rhodes. "Effects of mineral content of bovine drinking water: Does iron content affect milk quality?" Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/22018.
Full textMaster of Science in Life Sciences
Meskhidze, Nicholas. "Iron mobilization in mineral dust and the possible effect of Asian pollution on C-uptake in North Pacific Ocean." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04082004-180333/unrestricted/meskhidze%5fnicholas%5f200312%5fphd.pdf.
Full textGrzeskiewicz, Ronald. "Effect of hydrogen on the coefficient of friction of iron." Thesis, This resource online, 1988. http://scholar.lib.vt.edu/theses/available/etd-04122010-083727/.
Full textCharman, R. G. "An investigation of iron in layer structured silicate minerals." Thesis, University of Greenwich, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383630.
Full textClark, Eldred Merlyn. "Evaluation of Methods Used in Meat Iron Analyses and Iron Content of Raw, Cooked, and Cured Meats." DigitalCommons@USU, 1997. https://digitalcommons.usu.edu/etd/5438.
Full textHoppler, Matthias. "Content and bioavailability of ferritin-bound iron in staple food crops /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18038.
Full textDuan, Qing. "Genetic polymorphisms in bovine ferroportin are associated with beef iron content." [Ames, Iowa : Iowa State University], 2010. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1476291.
Full textSiafakas, Dimitrios. "Investigation of Hydrogen and Nitrogen Content in Compacted Graphite Iron Production." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119086.
Full textSPOFIC
Tian, Feng, and n/a. "The organic complexation of iron in seawaters around New Zealand." University of Otago. Department of Chemistry, 2006. http://adt.otago.ac.nz./public/adt-NZDU20070117.091325.
Full textNikolaiczuk, Marcia Jane. "Relative availability of iron to rats from beef, soy protein and a beef-soy protein mixture as determined by iron repletion assay." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24874.
Full textLand and Food Systems, Faculty of
Graduate
Kirby, A. W. "The reduction of iron content in ferrochromium via the nitriding/leaching route." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377841.
Full textOzcan, Alper. "The Effect Of Sn Content And Isothermal Transformation Temperature On The Mechanical Properties Of Austempered Ductile Cast Iron." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1055359/index.pdf.
Full textAmarakoon, Amarakoon Rajapakse Wasala Mohotti Mudiyanselage Darshika. "Iron Biofortification Potential of Field Pea (Pisum Sativum L.)." Thesis, North Dakota State University, 2012. https://hdl.handle.net/10365/26518.
Full textGriffiths, P. D. "Alterations in neurotransmitter receptors and iron content in Parkinson's disease and Alzheimer's disease." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328333.
Full textMoser, Martin. "Studies on iron supply in veal calves and on transferrin levels in cattle /." [S.l : s.n.], 1994. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Full textDeursen, Cornelius Thomas Bernardus Maria van. "Iron content of liver tissue a biochemical, histological and clinical study, especially in hereditary haemochromatosis /." [Maastricht : Maastricht : Rijksuniversiteit Limburg] ; University Library, Maastricht University [Host], 1989. http://arno.unimaas.nl/show.cgi?fid=5456.
Full textYao, Yingshan. "The influence of niobium content and cooling rate on mechanical properties of grey cast iron." Thesis, KTH, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-244999.
Full textDetta projekt undersökte huvudsakligen hur innehållet av niob (Nb) påverkar gråstålens mikrostruktur och mekaniska egenskaper. Med tanke på mekanismen analyserar undersökningen även förhållandet mellan mikrostruktur och mekaniska egenskaper. Arbetet baseras i allmänhet på 127 provstänger / prover från två cylinderhuvuden och tre satser av plattor, vilka studerades genom mätning av draghållfasthet, mikrohårdhet, grafitstorlek, karbidmängd och kemi. Resultatdata har utvärderats med statistiska metoder. Experimenten inbegriper huvudsakligen beredningen av proven för test och analys. De mekaniska egenskaperna i denna studie utvärderas av gråstålets draghållfasthet. Under tiden applicerades olika mikroskopier för att observera hur niob- och kylhastigheten påverkar mikrostrukturen. Slutligen, från analysresultaten, berättar den att niobet påverkar draghållfastheten hos grågjutjärn. Ju högre niobinnehållet är, desto högre är draghållfastheten. Det beräknade resultatet baserat på data visar också niobins starka effekt. Den snabbare kylhastigheten ökar också draghållfastheten och pearliten-mikrohårdheten hos grågjutjärn. Karbidmängden av grågjutjärn kan ökas genom tillsats av niobhalt. Vidare måste vissa framtida arbeten göras för att förklara det olösta problemet i detta resultat. Skälen till varför en specifik position A-2-d av plattor har höga dragkrafter kräver mer mikrostrukturundersökning. För niobinpåverkan måste fler experiment och data som innehåller ett större antal niobinnehåll också göras för att bevisa matematikresultaten i denna rapport.
Shorney, Holly L. "The performance of free chlorine and chlorine dioxide oxidation and/or alum coagulation for the removal of complexed Fe(II) from drinking water." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/44744.
Full textMaster of Science
Jin, Ji-yun. "Boron chemistry in selected Virginia soils and hydroxy aluminum and iron systems." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54304.
Full textPh. D.
Cangialosi, Michael Vincent. "The Effect of Clay Content and Iron Oxyhydroxide Coatings on the Dielectric Properties of Quartz Sand." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/42579.
Full textMaster of Science
Huang, Rong [Verfasser], and Daniel [Akademischer Betreuer] Frost. "Bridgmanite crystal chemistry and iron content in the Earthʹs lower mantle / Rong Huang ; Betreuer: Daniel Frost." Bayreuth : Universität Bayreuth, 2020. http://d-nb.info/1204997519/34.
Full textMoffat, Christopher. "Acclimation to iron limitation in the haptophyte Coccolithus pelagicus : a molecular investigation." Thesis, University of Stirling, 2008. http://hdl.handle.net/1893/1751.
Full textTadayyon, Ali, Sedigheh Beheshti, and Mohammad Pessarakli. "Effects of sprayed humic acid, iron, and zinc on quantitative and qualitative characteristics of niger plant ( Guizotia abyssinica L.)." Taylor & Francis, 2017. http://hdl.handle.net/10150/626135.
Full textBatchily, Abdul Karim 1952. "Use of Chroma Meter color measurements to evaluate the organic carbon, iron, and water content of soils." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277947.
Full textThyrén, Linnea. "Plant-based meat substitutes and their nutritional composition : A study on iron content, zinc content, calcium content and protein quality in meatballs and plant-based substitutes and how they contribute to the goal of reaching recommended daily intakes." Thesis, Linnéuniversitetet, Institutionen för kemi och biomedicin (KOB), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-96761.
Full textWestphal, Karsten, Ralf Klose, and Manfred Golze. "Eisengehalt von Fleisch - Ermittlung des Eisengehalts im Fleisch verschiedener Tierarten." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-25410.
Full textÅberg, Franz. "Mineralogical Study of Manganese Bearing Skarn Minerals and Manganese Content in Magnetite in the Dannemora Skarn Iron Ore Deposit." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-263473.
Full textSkarn-järnmalmsfyndigheten i Dannemora är belägen i den nordöstra delen av Bergslagen. Järnmalm och mindre sulfidmineraliseringar har blivit brutna sedan 1400-talet. Gruvan stängde 1992 men togs i produktion igen under 2012. Gruvan stängs återigen under 2015. Fyndigheten är omgiven av 1.9 Ga gamla sedimentära och vulkaniska bergarter. Järnmalmsfyndigheten innehåller både manganrika och manganfattiga järnmalmer. Syftet med denna studie är att undersöka varför fyndigheten har förhöjda halter av mangan. Förändringar av manganhalter och olika värdbergarter borde ge en annorlunda mineralsammansättning i de olika miljöerna. För att svara på dessa frågor skall både mikroskopiska och kemiska undersökningar göras för att bestämma och identifiera olika mineralogiska associationer. Petrografiska och kemiska studier indikerar två olika huvudtyper av amfiboler: kalciumhaltiga amfiboler och Mg-Fe-Mn-Li-amfiboler. Kalciumamfibolerna är generellt mer spridda i proverna medan Mg-Fe-Mn-Li-amfibolerna är mer koncentrerade till de mer manganrika sektionerna. När koncentrationen av mangan är högre blir granater och även epidot och olivin vanligare, speciellt närmare vulkaniska bergarter.
Shin, Dae Keun. "Antioxidant, color and sensory properties of sorghum bran in pre-cooked ground beef patties varying in fat and iron content." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1120.
Full textRam, Gokul, and Vishnu Harikrishnan. "INFLUENCE OF CARBON CONTENT AND COOLING CONDITIONS ON THE THERMAL CONDUCTIVITY AND TENSILE STRENGTH OF HIGH SILICON LAMELLAR GRAPHITE IRON." Thesis, Tekniska Högskolan, JTH, Material och tillverkning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-51152.
Full textIsaksson, Jenny. "Slag Cleaning of a Reduced Iron Silicate Slag by Settling : Influence of Process Parameters and Slag Modification on Copper Content." Licentiate thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-84798.
Full textFeng, Huan. "Preparation of glass-ceramics largely using steelmaking slags and study on the effect of iron content on properties of glass-ceramics." Scholarly Commons, 2014. https://scholarlycommons.pacific.edu/uop_etds/219.
Full textRauch, Jeanne-Marie. "Comportement électrochimique d'électrolytes Zinc Fer à haute teneur en Fer, germination et effet des courants pulsés." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2022. http://www.theses.fr/2022UBFCD031.
Full textThe development of new corrosion resistant plating has become a challenge in both environmental and economic terms. Indeed, numerous constraints have aroused in surface treatments domain in recent decades, most of them due to the restriction on the use of certain products. As for example, RoHS Directive (Restriction of the Use of Certain Hazardous Substances) limits the use of dangerous substances in electrical and electronic equipment. In the same manner, REACH European regulations realized the substances inventory before their authorization, for the improvement of environmental conditions and human health. This include the control of metal salts as for example nickel sulphates, used in several applications such as zinc-nickel coatings. To overcome these constraints, new solutions have already been explored during the IZAC project: Innovative Zinc Alloys Coating. This project, a consortium between the UTINAM laboratory an d industrial partners, has contributed to the development of a ZnFe sacrificial layer with high iron content, subject to an international patent. The present work is part of the ATLAS project, led by the IRT M2P, which gather together three French and Belgian Universities associated to a consortium of 22 industrials partners. The academic contribution of the present thesis made in the UTINAM institute is the understanding of the electrochemical behavior of the electrolyte by discriminating the influence of every constituents. The different functions (complexing agents, chemisorption additives, supports salts…) will be insulated from the interactions (complexation and precipitation). The dynamic behavior of the systems will also be observed by the study of the transients during the modulation of the polarized current wave. The final goal will end up with the most effective sequences regarding the electrodeposition ability and the content of alloys elements, with simple and inverse pu lses. Special attention will be paid to microscopic phenomena and to the first moments of the plating, since the germination step is repeated for each current pulse, by high speed chronoamperometry. A modeling of the behavior of the boundary layer will be proposed by using the diffusion equation with COMSOL solver. In a second part of the thesis, physicochemical and functional properties of the plating obtained for different conditions will be investigated. For this purpose, effects of pulsed currents on the coatings composition, alloying elements distribution and thickness distribution will be quantified. Modelling will be used together with pulsed currents to obtain a better repartition of current lines on simple and complexes geometries. The objective is to act for an optimum repartition of the coatings on the surfaces of flat parts, but also on accidents (grooves, holes, blind holes, elbows…) thanks to a better understanding of the interactions between the electrolyte and the p ulsed currents. The coatings elaborate with the best pulse sequence parameters (Ja, Jc, Ta, Tc…) will be characterized by several techniques among with scanning microscopy (SEM) or X-ray diffraction (XRD) as well as for their functional behavior, by internal laboratory tests and with industrial partners means. Finally, to apprehend the scale-up to greater volumes at IRTM2P, a study of the parameters in a pilot unit at the UTINAM Institute will be undertaken
Bacaicoa, Inigo [Verfasser]. "Effect of heat treatment and iron content on the microstructure and mechanical properties of a secondary Al-Si-Cu alloy / Inigo Bacaicoa." Kassel : Universitätsbibliothek Kassel, 2019. http://d-nb.info/1195721846/34.
Full textFALERO, EDELINK EFRAIN TINOCO. "DEVELOPMENT OF A TECHNIQUE TO PERMIT THE USE OF IRON ORES BEARING HIGH PHOSPHOR CONTENT AIMING AT COMPETITIVENESS FOR THE DIRECT REDUCTION MARKET." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19251@1.
Full textPROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
As pelotas de minério de ferro têm suas propriedades fortemente dependentes da natureza das fases escorificadas que se formam durante o processo de queima. Neste trabalho são apresentados os resultados de uma das pesquisas que compõem o projeto cooperativo entre a Samarco e o Grupo de Siderurgia do DEMa / PUC-Rio, envolvendo a possibilidade de utilização de minérios de ferro portadores de fósforo (pellet feed), na produção de pelotas para redução direta. Com este objetivo foram geradas amostras de escórias sintéticas de mesma composição que as das pelotas RD comerciais, as quais foram submetidas a condições experimentais análogas as do processo industrial. Inicialmente a ciclos térmicos em forno tipo pot-grate e, posteriormente, em escala laboratorial, usando forno de mufla, seguido de etapas de resfriamento em velocidades distintas. Foi possível então constatar que velocidades mais altas de resfriamento, aplicadas na etapa final dos ciclos térmicos, produziam escórias sintéticas sensivelmente amorfas, o que levou a conclusão que as fases escorificadas das pelotas RD também se apresentariam como estruturas não cristalinas. Finalmente, por meio de teste especificamente desenvolvido para a análise seletiva de fósforo em fases oxídicas, conseguiu-se obter uma maior eficiencia na mensuração deste elemento quando dissolvido em escórias amorfas, o que viabilizou a medida das quantidades de fósforo que efetivamente migraram para as mesmas, quando se submetiam as amostras de pellet feed a diferentes temperaturas, variados tempos de residencia e distintas basicidades. Por fim, foi possivel concluir ser o incremento de basicidade do pellet feed um fator de significativa melhoria para o transporte e a dissolução do fósforo pelas escórias, em particular quando submetidos a temperaturas superiores a 900 graus Celsius.
Iron ore pellets have their properties strongly dependent on the nature of the phases present in the slags formed during pelletization. In this work are presented the first results of a research program involving the utilization of phosphorous bearing iron ores in the production of DR pellets (Direct Reduction pellets). Aiming at this, synthetic slags, produced with same composition of the gangue of a commercial DR pellet, were submitted to operational conditions similar to those of the industrial pelletizing process, but performed in a pot-grate reactor and in a laboratory furnace. The obtained slags samples were cooled at different rates, permitting to observe that at high cooling rates the slags obtained were amorphous, suggesting the occurrence of a similar amorphous structure for the slags present in the DR pellets. Finally, tests developed for a selective analysis of phosphorous in oxide phases, showed better efficiency when applied to amorphous slags than in crystalline ones. Further, the behavior of the phosphor dissolution in the obtained slags during the heating of pellet feed samples was evaluated. In this phase different temperatures, resident times and basicities were tested using a laboratory furnace. The results indicated improvements in the phosphor dissolution with the basicity increase when temperatures above 900 Celsius degrees were applied.
Webber, J. Beau W., Philip Bland, John H. Strange, Ross Anderson, and Bahman Tohidi. "Why you can’t use water to make cryoporometric measurements of the pore size distributions in meteorites – or in high iron content clays, rocks or concrete." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-191847.
Full textWebber, J. Beau W., Philip Bland, John H. Strange, Ross Anderson, and Bahman Tohidi. "Why you can’t use water to make cryoporometric measurements of the pore size distributions in meteorites – or in high iron content clays, rocks or concrete." Diffusion fundamentals 10 (2009) 3, S. 1-3, 2009. https://ul.qucosa.de/id/qucosa%3A14092.
Full textFiner, Julia E. "Evaluation of the Effect of Dioxygen, Industrial Heterogeneous Palladium Catalyst, pH and Iron Content on the Generation of 3 High-Value Aldehydes from Corn Stover Lignin." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397234827.
Full textMäkinen, Katri. "Optimisation of local material parameters : Optimising local material parameters in ductile cast iron cylinder head casting." Thesis, Jönköping University, JTH, Material och tillverkning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54500.
Full textJeftić, Jelena. "The influence of pressure on the thermal equilibrium and the relaxation dynamics in the iron(II) spin-crossover systems : [Zn1-xFex(ptz)6](BF4)2 and [Fe(ptz)6](PF6)2, (x = 0.1, 0.32 and 1, ptz = 1-n-propyltetrazole) /." [S.l.] : [s.n.], 1997. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Full textSnyder, William E. "Construction of a hybrid vector which allows for regulation of expression of cloned genes in anacystis nidulans R2 by controlling the iron content of the growth medium." Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/560278.
Full textDepartment of Biology
Цюра, Надія Ярославівна. "Сумісний процес фільтрування та сушіння дисперсних матеріалів." Diss., Національний університет "Львівська політехніка", 2021. https://ena.lpnu.ua/handle/ntb/56692.
Full textRentel, Raimund. "Development and implementation of a flow injection analyser with chemiluminescence for detection of sub-nanomolar Fe in seawater." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95832.
Full textENGLISH ABSTRACT: Iron is an essential micronutrient for all phytoplankton and is found in seawater at picomolar-level concentrations. For the first time in South Africa, a technique that utilizes a flow injection analyser (FIA) coupled with a chemiluminescence reaction has been developed for the analysis of Fe in seawater samples. The developed method is an improvement on similar available methods and uses commercially available resin (IDA) as opposed to the one that requires synthesis in the laboratory. Furthermore, the method requires reduced reagent concentrations thereby providing better results in a cost-efficient and easy manner. The improvements resulted in better precision while eliminating the loss of resin through bleeding, a common problem when using 8-HQ resin as per prior methods. Method validation was performed using internationally calibrated reference material provided by GEOTRACES and the values obtained were within the error limits of certified range. An inter-laboratory calibration was also conducted as part of the verification of the system. Surface samples from the SANAE 51 cruise were analysed for dFe and TdFe. Subsequently, the method was implemented on the SANAE 53 voyage on board the SA Agulhas II, to assess trace metal sampling protocol for any contamination issues, as well as for the analyses of collected samples. Current results suggest some contamination during collection stages, but this is still to be verified by complementary data on macronutrients and chlorophyll. The method was successfully developed and implemented in a land based clean laboratory, as well as on board a vessel.
AFRIKAANSE OPSOMMING: Yster is „n noodsaaklike mikrovoedsel vir fitoplankton en word in seewater in pikomolêre konsentrasies gevind. Hierdie lae konsentrasies en potensiële besoedeling gedurende monsteropname vanaf „n skip se platform maak akkurate Fe-analise moeilik. Vir die eerste keer in Suid-Afrika is „n tegniek ontwikkel wat gebruik maak van „n vloei- inspuitinganaliseerder (VIA), met „n geassosieerde chemiluminessensiereaksie, om die analise van Fe in seewatermonsters uit te voer. In teenstelling met soortgelyke bestaande metodes wat labratorium-gesintetiseerde hars vereis, is die nuut-ontwikkelde metode „n verbetering wat gebruik maak van „n kommersieel-beskikbare hars (IDA). Verder vereis die metode verminderde reagenskonsentrasies wat sodoende beter resultate lewer op 'n koste-effektiewe en eenvoudiger wyse. Die verbeteringe het gelei tot verhoogde akkuraatheid en uitskakeling van die verlies van hars deur dreinering – „n algemene probleem wat ondervind is met die gebruik van 8-HQ hars in vorige metodes. Geldigheidsbepaling van die metode is met internasionaal-gekalibreerde verwysingsmateriaal, verskaf deur GEOTRACES, uitgevoer. Die waardes wat verkry is, was binne die foutgrense van die gesertifiseerde skaal. „n Interlaboratorium-kalibrasie is ook uitgevoer as deel van die verifikasie van die stelsel. Daarna is die metode geïmplementeer gedurende die SANAE 53 reis op die SA Agulhas II, om die spoormetaal-monsternemingprotokol vir enige besoedelingskwessies te evalueer, asook vir die ontleding van versamelde monsters. Huidige resultate dui op „n mate van besoedeling tydens die versamelingstadiums, maar dit moet nog geverifieer word deur aanvullende data van die totale oplosbare Fe, makrovoedingstowwe en chlorofil.
MÖRÉE, GUSTAV. "Experimental Comparison of Losses in a Grid-connected and M2C-fed 11kW Induction Motor." Thesis, KTH, Elektrisk energiomvandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160705.
Full textDetta examensarbete analyserar effektförluster i induktionsmaskiner och hur förlusterna beror på övertonsinnehållet i den matande spänningen. Två fall kommer att jämföras, ett fall där en maskin är matad från en sinus spänning och ett fall med en modulär multinivå omvandlare (M2C). Sinusen representerar ett idealt nät medan M2C representerar ett fall med övertonsinnehåll. Användning av omvandlare för elekriska drivsystem ökar på grund av fördelarna när rotorhastighet kan varieras genom att ändra frekvensen från den matande växelriktaren. Detta ökar vanligtvis verkningsgraden på det sammanlagda systemet, men detta bidrar även med övertonsinnehåll matat till maskinen och switchförluster i omvandlaren. Låga switchförluster i omvandlaren medför oftast ett högt övertonsinnehåll som istället ökar förlusterna i maskinen. M2C är därför föreslaget som en teknik som håller övertonsinnehållet lågt medan switchförlusterna är relativt låga. Denna studie fokuserar på järnförluster, den del av de totala förlusterna som är som svårast att förutse eller mäta. De metoder som finns för att beräkna järnförlusterna är vanligtvis grova skattningar som inte tar hänsyn till inverkan från spänningens övertoninnehåll, även om järnförluster beror på övertonerna i stor utsträckning. Experimentella resultat i studien visar att förlusterna i ett M2C-matat fall inte avviker i stor utsträkning jämte ett sinusmatat fall. Skillnanen kan förklaras utifrån den lilla ökningen av järnförluster från det låga övertonsinnehållet från M2C:n. Järnförlusterna ses vara kopplade till övertonsinnehållet i spänningen.
Weissfloch, Phillip. "Iron-GaAs schottky contact for mesfet applications." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61798.
Full textCollin, Angelica, and Matilda Hammarberg. "Röstfaktorer som avslöjar ironi : Akustiska likheter och skillnader mellan sinnesstämningar." Thesis, Linköpings universitet, Institutionen för klinisk och experimentell medicin, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-106209.
Full textThe word irony is defined as an utterance where the meaning is the opposite of the words. This report is a continuing study of Peder Palmér's study What is ironic speech: to find the auditory clues (2013). The basis for this follow-up study consists of recordings with three different talkers with five sentences in five different moods: happiness, anger, seriousness, irony and sarcasm. Thirty men and women aged 18 to 60 years have been listening to the sentences and categorized them based on interpreted mood. The authors have measured fundamental frequency and intensity, and used these measurements as a basis to elucidate the perception of irony and the ability to perceive mood based on changes in fundamental frequency and intensity. The fundamental frequency has also been compared between the three talkers. An acoustic comparison between the different moods forms the basis for the analysis, which can provide information about the importance of acoustic parameters, as well as other factors such as context, when identifying different moods. The aim is to examine whether the moods that are most similar from an acoustic perspective are the ones that the test subjects most often fail to distinguish. The results show that it is difficult to solely from acoustic parameters interpret mood. Fundamental frequency and intensity appear to be of some importance when confusing irony with other moods. No differences were found between men and women's ability to detect irony and sarcasm based solely on acoustic parameters.
Haselgrove, Colin. "Iron Age coin finds in South-East England : the archaeological context." Thesis, University of Cambridge, 1986. https://www.repository.cam.ac.uk/handle/1810/273112.
Full textBrachmann, Steffi. "Wertigkeit ausgewählter Eisenstoffwechselparameter im Ausdauersport." Doctoral thesis, Humboldt-Universität zu Berlin, Philosophische Fakultät IV, 2011. http://dx.doi.org/10.18452/16304.
Full textIntroduction: Athletes are commonly diagnosed with iron deficiency, particularly those involved in endurance sports. It often not only decreases athletic performance but also contributes to the development of anaemia. Many biochemical markers are used to evaluate body iron stores but some of them are affected by physical exercises. This study was designed to investigate new haematological parameters in endurance athletes. Results and discussion: Reticulocyte hemoglobin content (CHr) and percentage of hypochromic red cells (% HYPO) were highly stable in athletes subjected to varying physical loads. Furthermore, they were neither affected by different forms of endurance sports nor by their duration and intensity. These modern indices are able to reflect the availability of iron during erythropoiesis at all times. In the early prediction of response to oral iron supplementation, the reticulocyte indices CHr and % HYPOr (percentage of hypochromic reticulocytes) are the most sensitive parameters. However, it is not possible to assess the iron status in athletes by CHr and % HYPO alone. In contrast to other clinical cases they can only be an additional parameter in the differential diagnosis of iron deficiency. The calculated reference range for endurance athletes are 28,8 - 35,9 pg for CHr and 0-0,5 % for % HYPO. As the iron-regulating hormone hepcidin is inhibiting the absorption of iron from the diet at the site of the duodenal enterocytes and blocking the release of iron from macrophages that have collected senescent erythrocytes, an exercise induced up-regulation of hepcidin activity might potentially be a new mechanism causing iron deficiency in athletes. Therefore, the development of hepcidin antagonists could prove to be helpful with regard to therapeutic utilization.
Sousa, Daniel Vieira de. "Alterações eletroquímicas e sua relação com a produção de gás metano em solos alagados por barragens." Universidade Federal de Viçosa, 2011. http://locus.ufv.br/handle/123456789/5542.
Full textFundação de Amparo a Pesquisa do Estado de Minas Gerais
The emission of gases of the greenhouse effect has increased dramatically since the geological era until the present days. Currently the use of fossil fuels and the changing of the use of the Earth are most responsible for the emission of these gases to the atmosphere.The carbon in the soil represents more than three times the carbon in the terrestrial biomass and about two times the carbon in the atmosphere, been a potential source of CO2 and CH4.The biogeochemical process that occurs in the soil or sediments for the emission of gases such as carbon dioxide and methane are controlled by process like the reduction of mineral compounds mainly oxides and amorphous and poor crystalline in anaerobic environment. These process leads to the formation of a favorable habitat suitable to the population grows of Methanogenic bacteria consequently with the production of gases of greenhouse effective. Nowadays there are several projects that defend that the hydroelectric dam offers a great contribution to the emission of the effective of greenhouse gases. This project has the purpose of study what the characteristics has more influence for the production of the emission of greenhouse effective in flood soils in hydroelectric lakes. The chapter one is dedicated to literature review where are addressed the more relevant topics. The chapter II had the purpose of studying the electrochemical dynamics of the soil at Zona da Mata mineira subject to flood due to the construction of hydroelectric. As a result we obtained that how bigger is the of Fe, bigger will be reduction of the soil, which lead us to establish the habitats proper for the establishment of the growth of Methanogenic bacteria‟s. population. The contents of Fe, CO and N have more influence in the ox reduction of flood soil. The chapter III had the purpose of studying dynamics and reactivity of the soil organic carbon (SOC) such as it is also dedicated to estimate the production of CH4 in soils flooded by hydroelectric dams lake with the purpose of identifying which characteristics has more influence in the production of methane comes from an eventually flooded of soils. As a result were obtained that the reactivity of SOC receives influence of the texture of the soil, and the finer is the texture greater is the presence of free fractions. The N shows an important factor to be analyzed due to its relation with the degradation of organic compound and microbial activity.
As emissões de gases do efeito estufa (GEE) têm aumentado vertiginosamente desde eras geológicos até os dias atuais. Atualmente a utilização de combustíveis fósseis, e alterações no uso da Terra, são as maiores responsáveis pelas grandes emissões destes gases para a atmosfera. O carbono contido no solo representa mais de três vezes o carbono contido em toda a biomassa terrestre e cerca de duas vezes o carbono contido na atmosfera, sendo, dessa forma, uma potencial fonte emissora de CO2 e CH4. Os processos biogeoquímicos que ocorrem em solos e ou sedimentos para emissão de gases como o dióxido de carbono e metano, são controlados por processos como a redução de compostos minerais, principalmente óxidos, amorfos e mal cristalizados em ambientes anaeróbios. Estes processos levam a formação de um habitat propício para o crescimento populacional de bactérias metanogênicas, com a conseqüente produção de gases do efeito estufa. Atualmente há diversos trabalhos que defendem que barragem de usinas hidroelétricas oferece uma grande contribuição na emissão de gases do efeito estufa. Nesta pesquisa objetivou-se estudar quais as características do exercem mais influencia para a produção de gases do efeito estufa em solos alagados em lagos de hidroelétricas. O capítulo I é dedicado a revisão de literatura, onde são abordados temas que se julgam relevantes. No capítulo II se objetivou estudar a dinâmica eletroquímica de solos da zona da mata mineira passíveis de serem submetidos a alagamento devido a construção de hidroelétricas. Como resultado obteve-se que quanto maior for a atividade de Fe, maior será o potencial de redução do solo, o que leva ao estabelecimento de habitats, apropriados para o estabelecimento de populações de bactérias metanogênicas. Os teores de Fe, CO e N, são os que mais exercem influencia no processo de oxiredução de solos alagados. O capítulo III teve por objetivo estudar dinâmica e reatividade do carbono orgânico do solo (COS), bem como dedicado a estimar a produção de CH4 em solos alagados por lagos de usinas hidroelétricas, com o intuito de identificar quais características exerce mais influência na produção de metano, provinda do eventual alagamento dos solos. Como resultados foram obtidos que a reatividade do COS recebe influencia da textura do solo, sendo que quanto mais fina a textura maior a presença de frações livres. O N total se mostra um importante fator a ser analisado devido sua relação com a degradação de compostos orgânicos e atividade microbiana.
Hernández, Farias Delia Irazu. "Irony and Sarcasm Detection in Twitter: The Role of Affective Content." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/90544.
Full textLas plataformas de redes sociales, como Twitter, ofrecen a los usuarios la posibilidad de expresarse de forma libre y espontanea haciendo uso de diferentes recursos lingüísticos como la ironía para lograr diferentes propósitos de comunicación. Manejar ese tipo de contenido representa un gran reto para la lingüística computacional. La ironía está estrechamente vinculada con la expresión indirecta de sentimientos, emociones y evaluaciones. El interés en detectar la presencia de ironía en textos de redes sociales ha aumentado significativamente en los últimos años. En esta tesis, introducimos el problema de detección de ironía en redes sociales desde una perspectiva de la lingüística computacional. Proponemos abordar dicha tarea enfocándonos, particularmente, en el rol de información relativa al afecto y las emociones para detectar la presencia de dicho recurso lingüístico. Con la intención de aprovechar el valor intrínseco de subjetividad contenido en las expresiones irónicas, presentamos un modelo para detectar la presencia de ironía denominado emotIDM, el cual está basado en una amplia variedad de rasgos afectivos. Para caracterizar instancias irónicas, utilizamos un amplio conjunto de recursos que cubren diferentes ámbitos afectivos: desde sentimientos (positivos o negativos) hasta emociones específicas definidas con una granularidad fina. Los resultados obtenidos muestran que emotIDM tiene un desempeño competitivo en los experimentos realizados, validando la efectividad del enfoque propuesto. Otro objetivo de la tesis es investigar las diferencias entre tweets etiquetados con #irony y #sarcasm. Nuestra finalidad es contribuir a un tema menos investigado en lingüística computacional: la separación entre el uso de ironía y sarcasmo en redes sociales, con especial énfasis en rasgos afectivos. Además, estudiamos un hashtag que ha sido menos analizado: #not. Nuestros resultados parecen evidenciar que existen diferencias entre los tweets que contienen dichos hashtags, sugiriendo que son utilizados para hacer referencia de diferentes recursos lingüísticos. Identificamos un conjunto de características basadas en diferentes fenómenos afectivos que parecen ser útiles para discriminar entre diferentes tipos de recursos lingüísticos. Adicionalmente analizamos la reversión de polaridad en tweets que contienen hashtags irónicos, observamos que el impacto de dicho fenómeno es diferente en cada uno de ellos. En el caso de los tweets que están etiquetados con el hashtag #sarcasm, a menudo hay una reversión total, mientras que en el caso de los tweets etiquetados con el hashtag #irony se produce una atenuación de la polaridad. Llevamos a cabo un estudio del impacto de la ironía y el sarcasmo en el análisis de sentimientos, observamos una disminución en el rendimiento de los sistemas de PLN desarrollados para dicha tarea cuando la ironía está presente. Por consiguiente, exploramos la posibilidad de utilizar nuestros resultados en detección de ironía para el desarrollo de un sistema de análisis de sentimientos que considere de la presencia de ironía, suponiendo que la detección de contenido irónico podría ayudar a mejorar la correcta identificación del sentimiento expresado en un texto dado. Con este objetivo, incorporamos emotIDM como la primera fase en un sistema de análisis de sentimientos para determinar la polaridad de mensajes en Twitter. Comparamos nuestros resultados con el estado del arte establecido en la tarea de evaluación "Semeval-2015 Task 11", demostrando la importancia de utilizar información afectiva en conjunto con características que alertan de la presencia de la ironía para desempeñar análisis de sentimientos en textos con lenguaje figurado que provienen de redes sociales. En resumen, demostramos la utilidad de aprovechar diferentes aspectos de información relativa al afecto y las emociones para tratar cuestiones relativas a la presencia de la ironí
Les plataformes de xarxes socials, com Twitter, oferixen als usuaris la possibilitat d'expressar-se de forma lliure i espontània fent ús de diferents recursos lingüístics com la ironia per aconseguir diferents propòsits de comunicació. Manejar aquest tipus de contingut representa un gran repte per a la lingüística computacional. La ironia està estretament vinculada amb l'expressió indirecta de sentiments, emocions i avaluacions. L'interés a detectar la presència d'ironia en textos de xarxes socials ha augmentat significativament en els últims anys. En aquesta tesi, introduïm el problema de detecció d'ironia en xarxes socials des de la perspectiva de la lingüística computacional. Proposem abordar aquesta tasca enfocant-nos, particularment, en el rol d'informació relativa a l'afecte i les emocions per detectar la presència d'aquest recurs lingüístic. Amb la intenció d'aprofitar el valor intrínsec de subjectivitat contingut en les expressions iròniques, presentem un model per a detectar la presència d'ironia denominat emotIDM, el qual està basat en una àmplia varietat de trets afectius. Per caracteritzar instàncies iròniques, utilitzàrem un ampli conjunt de recursos que cobrixen diferents àmbits afectius: des de sentiments (positius o negatius) fins emocions específiques definides de forma molt detallada. Els resultats obtinguts mostres que emotIDM té un rendiment competitiu en els experiments realitzats, validant l'efectivitat de l'enfocament proposat. Un altre objectiu de la tesi és investigar les diferències entre tweets etiquetats com a #irony i #sarcasm. La nostra finalitat és contribuir a un tema menys investigat en lingüística computacional: la separació entre l'ús d'ironia i sarcasme en xarxes socials, amb especial èmfasi amb els trets afectius. A més, estudiem un hashtag que ha sigut menys estudiat: #not. Els nostres resultats pareixen evidenciar que existixen diferències entre els tweets que contenen els hashtags esmentats, cosa que suggerix que s'utilitzen per fer referència de diferents recursos lingüístics. Identifiquem un conjunt de característiques basades en diferents fenòmens afectius que pareixen ser útils per a discriminar entre diferents tipus de recursos lingüístics. Addicionalment analitzem la reversió de polaritat en tweets que continguen hashtags irònics, observant que l'impacte del fenomen esmentat és diferent per a cadascun d'ells. En el cas dels tweet que estan etiquetats amb el hashtag #sarcasm, a sovint hi ha una reversió total, mentre que en el cas dels tweets etiquetats amb el hashtag #irony es produïx una atenuació de polaritat. Duem a terme un estudi de l'impacte de la ironia i el sarcasme en l'anàlisi de sentiments, on observem una disminució en el rendiment dels sistemes de PLN desenvolupats per a aquestes tasques quan la ironia està present. Per consegüent, vam explorar la possibilitat d'utilitzar els nostres resultats en detecció d'ironia per a desenvolupar un sistema d'anàlisi de sentiments que considere la presència d'ironia, suposant que la detecció de contingut irònic podria ajudar a millorar la correcta identificació del sentiment expressat en un text donat. Amb aquest objectiu, incorporem emotIDM com la primera fase en un sistema d'anàlisi de sentiments per determinar la polaritat de missatges en Twitter. Hem comparat els nostres resultats amb l'estat de l'art establert en la tasca d'avaluació "Semeval-2015 Task 11", demostrant la importància d'utilitzar informació afectiva en conjunt amb característiques que alerten de la presència de la ironia per exercir anàlisi de sentiments en textos amb llenguatge figurat que provenen de xarxes socials. En resum, hem demostrat la utilitat d'aprofitar diferents aspectes d'informació relativa a l'afecte i les emocions per tractar qüestions relatives a la presència d'ironia en Twitter.
Hernández Farias, DI. (2017). Irony and Sarcasm Detection in Twitter: The Role of Affective Content [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/90544
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