Dissertations / Theses on the topic 'Fines production'
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Richard, Udoh Richard. "SAND & FINES IN MULTIPHASE OIL AND GAS PRODUCTION." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24075.
Full textHadjri, Karim. "The viability of 'no-fines' for the production of appropriate housing in Algeria." Thesis, Oxford Brookes University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315276.
Full textGabites, John Raymond. "Washable Baghouse Operation and Design as Applied to Milk Powder Production." Thesis, University of Canterbury. Chemical and Process Engineering, 2007. http://hdl.handle.net/10092/3270.
Full textMarquié, Sandrine. "Production et circulation des céramiques fines d'époques hellénistique et romaine en Méditerranée : le cas des sigillées découvertes à Kition (Chypre)." Lyon 2, 2003. http://theses.univ-lyon2.fr/documents/lyon2/2003/marquie_s.
Full textMarquié, Sandrine Yon Marguerite. "Production et circulation des céramiques fines d'époques hellénistique et romaine en Méditerranée le cas des sigillées découvertes à Kition (Chypre) /." Lyon : Université Lumière Lyon 2, 2003. http://demeter.univ-lyon2.fr/sdx/theses/lyon2/2003/marquie_s.
Full textElaigne, Sandrine Empereur Jean-Yves. "La mobilité des produits et des techniques céramiques en Méditerranée orientale du IIe siècle avant J.-C. à l'époque claudienne le cas des céramiques fines d'après les contextes d'habitat d'Alexandrie (Egypte) /." Lyon : Université Lumière Lyon 2, 2002. http://theses.univ-lyon2.fr/sdx/theses/lyon2/2002/elaigne_s_notice.
Full textOsong, Sinke Henshaw. "Mechanical Pulp Based Nano-ligno-cellulose : Production, Characterisation and their Effect on Paper Properties." Licentiate thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-21555.
Full textAltinalmazis, kondylis Andreas. "Tree diversity effects on root production, decomposition and nutrient cycling under global change." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0067.
Full textThe insurance hypothesis predicts that forests with tree species mixtures may resist better to stressful environmental conditions than forests composed of only one tree species. Most of the currently available literature tested this hypothesis for aboveground productivity and its related response variables, but less is known about belowground processes. In my PhD thesis, I studied the drivers of belowground productivity and decomposition across climatic gradients and how they are affected by tree mixtures. I hypothesized that mixing of tree species with contrasting rooting patterns and fine root morphologies, would result in a release of competitive pressure belowground, and translate into higher fine root standing biomass and increased fine root productivity. Moreover, I hypothesized that roots with contrasting chemical and morphological characteristics in mixed stands would decompose faster, which may be particularly important under nutrient-limited conditions. Under water-limiting conditions, such as during extreme summer drought, I hypothesized overall slower decomposition but an attenuating effect of tree mixtures on decomposition due to improved micro-environmental conditions, in particular for leaves, since roots decompose in a more buffered soil environment. To test these hypotheses I examined the variation in tree root functional traits (across- and within-species), and its consequences for fluxes of C, N and P at the ecosystem scale. I addressed three main objectives and associated research questions to quantify the interactive effect of tree mixtures and climate on: 1) vertical root segregation and fine root standing biomass, 2) fine root dynamics and their associated nutrient fluxes and 3) fine root- and leaf litter decomposition. I could benefit from two different field experiments for my work, one with a 10-year-old tree-plantation experiment with birch and pine close to Bordeaux (ORPHEE experiment), the second along a latitudinal gradient of mature beech forests in the French Alps (BIOPROFOR experiment).I observed that roots from the birch and pine tree-plantation showed similar vertical distribution and similar belowground root standing biomass in tree mixtures compared to monocultures, contrary to my first hypothesis. However, the greater allocation of pine but not of birch to root growth within the top soil horizons under less water-limiting conditions suggests locally favourable conditions that may lead to soil depth-specific asymmetric competition. In the same experiment, fine root production and decomposition were similar in mixtures and in monocultures, in contradiction with my second hypothesis. Moreover, I did not observe any interactive effects of tree mixtures with stand density or water availability. Interestingly though, birch roots, but not pine roots released P during root decomposition, which suggests an important role of birch in the P-cycle and for P nutrition of trees on these P-limited sandy soils. In line with my third hypothesis, I observed a slower decomposition of leaf litter and fine roots in response to reinforced and prolonged summer drought, irrespective of the position along the latitudinal gradient in the Alps. However, this slower decomposition under drought was not attenuated in forest stands with mixed tree species compared to single species stands. Compared to leaf litter, fine roots decomposed slower and released less C. Interestingly, I found a net N release in decomposing fine roots but not in decomposing leaf litter, which suggests a distinct role of fine roots in the N cycle. In conclusion, I found that mixing tree species did not attenuate negative effects of climate change. However, this thesis demonstrates that promoting mixtures can still be beneficial for at least one of the admixed tree species, through species addition (i.e., complementing one tree species with another tree species), as one tree species may facilitate another via belowground fluxes of N and P
Élaigne, Sandrine. "La mobilité des produits et des techniques céramiques en Méditerranée orientale du IIe siècle avant J. -C. à l'époque claudienne : le cas des céramiques fines d'après les contextes d'habitat d'Alexandrie (Egypte)." Lyon 2, 2002. http://theses.univ-lyon2.fr/sdx/theses/lyon2/2002/elaigne_s_notice.
Full textIn Alexandria, which was an important trade center in Antiquity, table ware were imported from many places. These wares came from workshops whose development and high level of organization allowed a large scale trading. Although the pottery workshops were numerous, those trading on a large scale were much fewer. This study deals with technical and cultural identity, quantity and provenance of fine wares found in Alexandria for approaching the question of trade. We also tried to assess at the part of the importations and the part of the local productions. The technical groups of production (called fabrics) and their respective quantity depending on the chronology were determined. A sample of sherds of some of the fabrics have been studied by chemical analysis aiming to find out the geographical provenience of these fabrics. All these investigations led us to precise our knowledge about the trading connections between Alexandria and the other Mediterranean lands. We also got new chronological indications concerning the quantity and the quality (technological level of the production) of each workshop producing and exportating pottery. We also tried to give a picture of the evolution of the production according to technological (black-glazed ware, red-glazed ware, ware without glaze) and cultural (evolution of shape, copy, disappearance, adaptation of shape) features and to compare these data with the trade mecanisms. Then, the Alexandrian series of fine pottery have been compared with other series from Mediterranean sites at the same period to determine Alexandrian specificities
Casanova, Michèle. "Le lapis-lazuli dans l'Orient ancien : gisements, production, circulation, des origines au début du second millénaire avant J.-C." Paris 1, 1998. http://www.theses.fr/1998PA010566.
Full textLapis lazuli is considered as the real precious gem in the ancient near east, it was the most highly prized symbolic goods and being in possession of it was a gage of political and religious power. It is during the neolithic period 7th millennium bc) that its history begins; it goes on until the 2d millennium bc and beyond. The stone is found on sites which are more than 3000 km away from each other from central asia to mesopotamia, and from syria to egypt. This gem is scarce and very difficult to get because deposits are located in very high mountains with means of access limited by natural conditions. Lapis lazuli worked in ancient eastern came from Badakhshan deposits (Afghanistan), Gorno- Badakhshan in Pamir mountains (Tadjikistan) and perhaps from chaghai hills (Pakistan). Lapis lazuli use reached its zenith during the 3rd millennium; it is testified by the fabulous treasures of the graves excavated in the royal cemetery at ur. The study of beadmaking remains and tools reveals the existence of a common process of working phases to produce lapis lazuli jewellery. Regional styles appeared between ornaments from egypt, syria, mesopotamia and susiana, or iran (except elam) or even central asia. The state cities organised in hierarchy from syria and mesopotamia were great consumers of symbolic goods, which were usefil to their propaganda. Craftsmen worked in workshops that depended on palaces or temples, the gilgamesh epic tell us gods equipped with lapis lazuli the beings they wanted to favour or give protection to before entering hell. Lapis lazuli symbolises vital energy which is the origin of deity power. It is not only agent, sign and expression of the circulation of goods, of ideas and cultural representations but also of influence, domination and exchange relations between the near east civilisation centres from 4th till 2d millennia BC
Inam, Muhammad Asif. "Particle sizing and product quality in production of fine and nano particles by means of wet grinding process." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0028/document.
Full textWet grinding process is an interesting means of producing fine and nano particles. The particle sizing plays an important role in interpretation, control and optimization of various aspects of the wet grinding process. There is a lack of knowledge in understanding different aspects of particle sizing during a wet grinding process. The particle sizing in a wet grinding process is typical in the sense: (i) The dispersions in a wet grinding process, often, involve additives and (or) impurities. It is less known how impurities and additives influence the particle size of the dispersions in the wet grinding process. (ii) In a wet grinding process, dispersions of different concentrations may be used. It is less known how dispersions of different concentration may influence the particle sizing in a wet grinding process. (iii) In a wet grinding process, the change in average particle size of the product is rapid due to relatively fast breakage of the particles. (iv) The degree of poly dispersity in product changes with grinding time. (v) The nature of interaction between particles is non-colloidal before grinding process; this interaction becomes colloidal after a certain grinding time. Similarly, there is a lack of knowledge to understand how quality of final ground product is influenced in a wet grinding process. This study investigates the different aspects of particle sizing and product quality of aqueous dispersions of CaCO3 in a wet grinding process carried out in a stirred media mill. Acoustic attenuation spectroscopy that is known for measuring particle size of dispersions on line, under real process conditions and without diluting the sample has been employed in the study in addition to the technique of dynamic light scattering. The study brings out the conditions in which the effects of impurities and additives etc. on particle size of the dispersions may be determined using acoustic attenuation spectroscopy. Furthermore, the study compares and analyze the particle sizing results obtained though acoustic attenuation spectroscopy and dynamic light scattering. The causes of differences in the results of two techniques have been investigated. We report presence of multiple scattering at high concentration of the dispersions during wet grinding process that result in misleading results of the particles sizes. Quality is an intangible concept. In order to understand how different operating parameters influence product quality, we propose a method based upon the definition of quality as defined in ISO 9000:2005. The method takes into consideration the important operating parameters of wet grinding process (such as the operating condition of the mill, the measurement of particle size and the material) and important product characteristics ( such as average particle size, range of width of particle size distribution, stability of dispersion, degree of impurities, specific energy input and physical appearance). We bring out how a relationship between operating parameters and products of different grades may be established in a wet grinding process
Andrys, de Stefano Maryse. "Le renouveau de la mosaïque monumentale en France de 1875 à 1903 : étude sur la production et l'activité des principaux ateliers parisiens de la fin du XIXé siècle." Besançon, 1995. http://www.theses.fr/1995BESA1015.
Full textSaptouw, F. "The production." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/11802.
Full textThe focus of this dissertation is the establishment of various entry-points into my practical project, Postproduction (2007 -2009). My project entails re-printing Nicolas Bourriaud's Postproduction (2007) with outdated and superseded printing technology, specifically letterpress/movable type. The text is printed onto paper that was handmade from original copies of Postproduction . Standard letterpress ink was used in combination with a Vandercook 219 AB press for the printing. To compensate for the occurrence of various complications and errors during the production process there were three to five working copies of the book. After a Single volume was selected for presentation in the gallery space all the remaining copies of the text were destroyed.
Carson, Tsia. "Queue Productions." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1394716600.
Full textLau, Wai Ngar. "Zeolite membrane microreactor for fine chemical production /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CENG%202006%20LAUW.
Full textBertrand, Eric Desbat Armand. "La production des céramiques à paroi fine à Lyon." Lyon : université Lyon 2, 2000. http://theses.univ-lyon2.fr/sdx/theses/lyon2/2000/ebertrand.
Full textUkleja, Sebastian. "Production of smoke and carbon monoxide in underventilated enclosure fires." Thesis, University of Ulster, 2012. http://hdl.handle.net/10919/22022.
Full textHyde, S. M. "Field modeling of carbon monoxide production in vitiated compartment fires." Thesis, Cranfield University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341050.
Full textDE, ALMEIDA DAVID. "Modelisation par reseaux de files d'attente de systemes de production." Clermont-Ferrand 2, 1996. http://www.theses.fr/1996CLF21819.
Full textAn, Ji Young. "Fine root dynamics and their contribution to carbon fixation in temperate forests of Japan and Korea." Kyoto University, 2018. http://hdl.handle.net/2433/232364.
Full textLindner-Lopez, Eduard. "Heterogenised palladium catalysts and magnetic carriers for fine chemicals production." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416028.
Full textAguilera, Bulla Daniel Antonio. "Polysaccharide encapsulated catalysts : towards the sustainable production of fine chemicals." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2019. http://www.theses.fr/2019ENCM0004.
Full textAlginates are natural polysaccharides extracted from brown macro-algae, available in nearly unlimited amounts at very low prices. In the presence of some divalent metals or by lowering the pH, these renewable biopolymers can readily form hydrogels, solvogels and aerogels, characterized by high surface areas, good mechanical properties, tolerance to different media, and easy manageability. In the last years, alginate gels have been gradually used as supports for a varied range of active chemical species in heterogeneous catalysis and as solid acid Brønsted catalyst. In this context, the present work contributes to broaden the use of alginate gels in asymmetric heterogeneous catalysis, exploiting the peculiar features of this class of natural biomaterials. In the first part of this study, the use of alginate gel beads as supports to prepare a heterogenized version of an amino Cinchona alkaloid for asymmetric Michael addition is described. In contrast with the classical immobilization via covalent attachment in oil-derived support, our approach was the immobilization of the organocatalyst using non-covalent interactions. The results presented here demonstrate that the adsorption of a representative Lewis base organic catalyst (9-amino-9-deoxy epi-quinine, QNA) takes place with high yields onto acidic alginate gels (AGs) using a very simple and straightforward protocol. This protocol is robust and fully reproducible. The resulting chiral solvogel beads (QNA@AGs) are active as heterogeneous catalysts in the addition of aldehydes to nitroalkenes, affording the corresponding adducts in good yields and moderate to excellent diastereo- and enantio-selectivities. In these reactions, the carboxylic functions of the biopolymer act as both acidic co-catalyst and non-covalent anchoring site for the tertiary amine catalyst (as observed by IR spectroscopy). The use of heterocationic gels, derived from alkaline earth metal gels by partial proton exchange, provided materials with better mechanical properties and higher porosities, ultimately resulting in higher catalytic activities. The alginate gels were also assessed as a possible way of transfering chirality from the support to a reaction outcome. The Friedel-Crafts alkylation of nitroalkenes with indoles was selected as a model reaction to evaluate preliminarily the enantio-induction by metal Lewis alginate gels. The library of alginate gels tested is active in the benchmark reaction. The Cu and Ba- alginate gels afford good activity and the enantiomeric-induction is proved, obtaining moderate enantiomeric excesses under the optimized reaction conditions. Furthermore, these two metals allow access to both enantiomers of the products, an important aspect given that only one enantiomeric form of alginates is available. Finally, the heterogeneous nature of the catalyst is proved using Cu-alginate gels. The full recyclability is demonstrated, by showing that Cu-alginate gels can be recovered and recycled without loss of stereochemical activity for at least five reaction cycles. This work represents the first utilization of alginates, abundant and renewable biopolymers, as gel supports/media for asymmetric organocatalytic processes and the first example of induction of enantioselectivity for a C-C bonding reaction with interest in the fine chemical industry
Fujimaki, Reiji. "Mechanism and function of fine root production in forest ecosystems." Kyoto University, 2005. http://hdl.handle.net/2433/145017.
Full text0048
新制・課程博士
博士(農学)
甲第11615号
農博第1471号
新制||農||905(附属図書館)
学位論文||H17||N4008(農学部図書室)
23258
UT51-2005-D364
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 武田 博清, 教授 二井 一禎, 教授 東 順一
学位規則第4条第1項該当
Zavahir, Fathima Sifani. "Development of visible light photocatalysts for organic fine chemical production." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/96049/1/Fathima%20Sifani_Zavahir_Thesis.pdf.
Full textFalasca, Silvia, and Ana Ulberich. "Análisis de principales limitaciones de los suelos del delta argentino con fines productivos." Pontificia Universidad Católica del Perú. Centro de Investigación en Geografía Aplicada, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/119900.
Full textZHOU, XIAO DONG. "Volumes finis et flux mixtes pour la simulation de la production d'hydrocarbures." Paris 11, 2000. http://www.theses.fr/2000PA112144.
Full textBérard, Frédéric. "Stratégies de gestion de production dans un atelier flexible de chimie fine." Toulouse, INPT, 2000. http://www.theses.fr/2000INPT002G.
Full textLéone, Julie. "La céramique à paroi fine de Musarna (Étrurie méridionale) : typologie, production, circulation." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM3006.
Full textThe Thin-walled ware is one of the most represented class of vessel ceramic found on roman archaeological sites. An important batch (around 25000 shards) has been found in the various areas explored in one of the etrusco-roman cities of Tarquinia's territory: Musarna. The study of that Corpus allowed us to identify fifty-eight forms of vases and to trace their technological evolution. The parallels found with the material coming from others sites in Etruria, in the whole Italy and in the conquered territories have evidenced the existence of several productions areas. The Thin-walled ware from Musarna can be divided in six chronological phases, distributed between the last third of the II century B.C. and the II century A.D
Nichol, Catherine. "Claiming process : a strategy of production in approaching notions of self, biography and community in painting." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/25921.
Full textBeech, Dave. "Neither capitalist nor wage-labourer : an economic examination of the exceptionalism of artistic production vis-à-vis the capitalist mode of production." Thesis, University of the Arts London, 2017. http://ualresearchonline.arts.ac.uk/12374/.
Full textHernández, González Camila. "Política de Incentivo a las Plantaciones Forestales con Fines Productivos en Colombia. Análisis y Recomendaciones." Tesis, Universidad de Chile, 2009. http://repositorio.uchile.cl/handle/2250/102056.
Full textWiegand, Aaron Nathaniel. "Modelling photochemical production of fine particulates in a toluene/NOx/water vapour system." Thesis, Queensland University of Technology, 1999. https://eprints.qut.edu.au/36975/1/36975_Digitised%20Thesis.pdf.
Full textCamargo-Pardo, Mauricio. "Estimation paramétrique des coûts des produits finis dans la filière textile-habillement." Valenciennes, 2004. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/fe756208-c237-4caf-a060-91109809c4ba.
Full textIn supply chains with high degree of product diversity and renewal, there is very difficult to establish economical laws at the design stage, in order to accurately forecast product cost. Nevertheless at this early stage, product cost is defined by 70 to 80% but also, only scarce product information is available, related mainly to product aesthetical features or functionalities. In order to minimise the risk of product reject, it is important for designers to have a cost estimation tool, flexible and easy to adapt. We use the parametric approach in order to develop Cost Estimation Relationships (CER's). First, we define a general methodology and main concepts in order to develop CER's as regression and softcomputing techniques. In particular we developed a Simplified Hybrid Neuro-Fuzzy model, allowing better variables interpretation, mainly for complex systems. Also, we proposed a tool in order to develop a CER by using the described modelling techniques. The candidates CER's could be compared in terms of accuracy, robustness and relevance. This tool allows a maximum of information in order to choose the best CER. This approach has been tested on a particular case concerning the development of specific CER for a textile printing industry
Lhéritier, Bernard. "Méthodes analytiques pour l'évaluation de réseaux de files d'attentes : applications aux systèmes flexibles de production." Clermont-Ferrand 2, 1990. http://www.theses.fr/1990CLF21304.
Full textLiu, Yi-Hung. "Analysis of Production Process of Fine Dry Ice Particles and Application for Surface Cleaning." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157619.
Full textValkama, Jukka P. [Verfasser]. "Optimisation of Low Consistency Fine Screening Processes in Recycled Paper Production / Jukka P Valkama." Aachen : Shaker, 2007. http://d-nb.info/1164340220/34.
Full textBjörk, Elisabeth. "Production and application of fine fractions made of chemical pulp for enhanced paperboard strength." Licentiate thesis, Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-40246.
Full textBöjstyvheten är en viktig egenskap för alla sorters hårda förpackningar. I flerskiktskartong får man böjstyvhet genom att ha ytterskikt med hög dragstyvhet tillverkade av fibrer från kemisk massa och ett mittskikt med hög bulk från styva fibrer, ofta med en stor andel CTMP (kemitermomekanisk massa). CTMP-fibrer är styva men ger lägre styrka i arket. För att öka styrkan i mittskiktet tillsätter man utskott (kasserad kartong) som delvis innehåller kemisk massa, och ibland även ren högmald kemisk massa. Både fibrer och finmaterial (fines) har stor betydelse för slutproduktens egenskaper. Fines som skapas vid malning av kemisk massa är särskilt effektiva för att öka styrkan. Genom att fraktionera massa med en mikroperforerad sil kan man få en finfraktion med högt finesinnehåll. Mikroperforerade silar är effektiva för längdfraktionering av massa; fines anrikas i den fraktionen som passerar silen medan långa fibrer stannar i den andra fraktionen. Genom att använda en sådan finfraktion i mittskiktet kan man få tillräcklig styrka och samtidigt behålla mer av bulken från CTMP:n genom att man inte behöver mala den för att få styrka. En nackdel är att finfraktionen vanligtvis har väldigt låg masskoncentration eftersom mycket vatten passerar silen tillsammans med fines och fiberfragment. Detta extra vatten måste tas bort för att vattenbalansen i papperstillverkningsprocessen ska bibehållas. Dessutom kräver den större volymen ökad pumpkapacitet. För att kunna använda en finfraktion industriellt behövs en effektiv produktion med hög koncentration och högt finesinnehåll. Fokus i det här arbetet lades på separationseffektivitet (skillnaden i fiberlängdsfördelning som resultat av silningen) och processeffektivitet (koncentrationen i finfraktionen) för tillverkning av en finfraktion av kemisk massa genom silning samt dess utnyttjande som styrkehöjande tillsats i ett mittskikt av kartong. För att utvärdera hur separationseffektiviteten och processeffektiviteten påverkas av parametrar som koncentrationen i flödet in till silen, typ av kemisk massa (gjord av lövved eller barrved), hålstorlek i silen samt malningen av massan, gjordes fraktioneringsförsök i pilotskala med en trycksil med olika mikroperforerade silkorgar. Resultatet av fraktioneringen utvärderades med hjälp av fiberlängdsfördelningar, flöden och koncentrationer i flödet till silen och de två fraktionerna efter silen. För utvärderingen togs två olika utvärderingsmetoder fram: Proportion i finfraktionen (för processeffektivitet) och Finfraktionsanrikning (för x separationseffektivitet). För att utvärdera hur effektiv en finfraktion av kemisk massa var som styrkeadditiv i ett CTMP-ark gjordes labbförsök där tillsats av högmald kemisk massa jämfördes med tillsats av enbart en finfraktion av den högmalda kemiska massan. Resultaten verifierades med ett försök på en pilotpappersmaskin. I ett följande försök på pilotpappersmaskinen tillverkades ark med ökat CTMP-innehåll för att öka bulken, och med en tillsats av en finfraktion av kemisk massa som styrkeadditiv. När det gäller processeffektivitet var hög koncentration i flödet till silen den viktigaste parametern för att få hög koncentration på finfraktionen. Detta var också positivt för separationseffektiviteten, färre av de längre partiklarna hamnade i finfraktionen. Vidare blev finfraktionens koncentration högre för lövvedsmassa. En finfraktion som ska användas som styrkeadditiv ska vara tillverkad av mald massa, malning av massan var också fördelaktigt för finfraktionens koncentration. Små hål och en slät yta på silkorgen var också positivt för separationseffektiviteten. Som styrkeadditiv i CTMP var finfraktionen av högmald kemisk massa dubbelt så effektiv som den högmalda kemiska massan vid lika stor tillsats. Men i både labbförsök och pilotförsök minskade bulken när styrkan ökade. Det var väntat eftersom att ersätta en del av originalmassan som har hög bulk, med en finfraktion eller högmald massa, som båda har mycket lägre bulk, alltid minskar bulken på arket. För att undvika en bulkförlust måste massasammansättningen i arket ändras. Försöket på pilotpappersmaskinen med ökat CTMP innehåll och en finfraktion av mald kemisk massa som styrkeadditiv visade att det är möjligt att tillverka ett ark med högre bulk och bibehållen styrka.
Donovan, McKeever. "The Building Breathes Together." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5482.
Full textCasillas, Joseph Vincent, and Joseph Vincent Casillas. "The Longitudinal Development of Fine Phonetic Detail in Late Learners of Spanish." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/621021.
Full textChahdi, El Ouazzani Redouan. "Modélisation et analyse des performances des systèmes de production utilisant des stocks tampons à capacités finies." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24544/24544.pdf.
Full textEl, Ouazzani Redouan Chahdi. "Modélisation et analyse des performances des systèmes de production utilisant des stocks tampons à capacités finies." Doctoral thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19025.
Full textDa, Cunha Catherine. "Définition et gestion de produits semi-finis pour une production de type "assemblage à la commande"." Grenoble INPG, 2004. http://www.theses.fr/2004INPG0089.
Full textThis phd thesis addresses the problem of the set-up of a stock policy adapted to a huge diversity context. We propose to include the notion of information levels into the classical question of design and inventory management. When product diversity enlarges, choosing an assemble to order policy offers a good compromise between product portfolio size and assembly lead time. We propose methods to help set up this policy. Actually this implementation raises the following question: how to make the set-up using the available information. This question can be split up in two: how to choose the modules to stock ? how to size stocks ? huge diversity also has a powerful impact on information. Therefore, our work enables to take into account different information levels. This study also aims at observing the advantage of information on final products demand. Therefore we : - model information about demand with an hierarchical point of view- develop an entropy-based method to construct information about final demand from available information- propose heuristics for the choice of modules- study the inventory problem on didactical examplesby those means we propose methods to deal with the two questions of ato set-up. Thanks to tests, we also stress the value of information
Schamper, Cyril. "Etude par simulation du suivi d'un réservoir en production par méthodes ElectroMagnétiques." Paris 6, 2009. http://www.theses.fr/2009PA066608.
Full textLow frequency electromagnetic methods from a controlled source (CSEM : Controlled Cource ElectroMagnetic) have been applied for a little more than a decade in oil exploration. As a complement to seismic methods, they permit lowering of the risk of «dry holes», since they are more sensitive to the nature of the uid contained in rock. Because of the numerous successes encountered, and experience acquired, petroleum companies foresee extending application of CSEM to the monitoring of reservoirs under production. The principal problems are monitoring the oil-water interface to avoid loss of production due to invasion by water, and to estimate the e_ciency of improved techniques on the recovery rate for production (EOR : Enhanced Oil Recovery). The interface of oil and water is subject to an essentially lateral displacement due of low thickness of hydrocarbon reservoirs having an area that exceeds several square kilometres. The work of this thesis, done in partnership between UPMC and CGG Veritas, consists of the theoretical feasibility of monitoring CSEM for the lateral displacement of oil-water interface with a n apparatus that permits obtaining information on the distribution of uids for a large surface reservoir. We are particularly interested in the land milieu. After an examination of the status of applied geophysical methods on the monitoring for hydrocarbon reservoirs, a presentation of the theory of simulation algorithms is made. For this thesis, two codes have been developed, parallelized and used on parallel machines for which the calculation grid is European, EGEE. The _rst uses the semi-analytic Method of Moments for the frequency domain, and by extension, for the time domain. The second is based on _nite di_erence for the time domain. The development is more concentrated on the Method of Moments (code : EM MOM). The EM MOM code was able to be tested during a cooperative mission with CIPR (Center for Integrated Petroleum Research) at the University of Bergen, Norway. The code permitted doing a sensitivity analysis in the frequency domain to identify device geometries better adapted to the monitoring of a hydrocarbon reservoir (depth of 1000 meters). The apparatus that yields the greatest sensitivity consists of a vertical dipole source buried at mid depth between the top of the reservoir and the ground surface, and of horizontal receptors for electrical _eld set on the ground surface. The level of 4D signal, i. E. , the di_erence of measured _eld at two di_erent instants («time lapse») remains at a level slightly over the ambient noise, which can largely be eliminated by summation (vertical stacking). A series of measures of ambient noise done by CGGVeritas, presented in the _rst part of this thesis, establishes this observation. A 4D inversion algorithm has demonstrated the possibility of interpreting the synthetic CSEM data by using a single position of source, and an array of receivers positioned on the surface. The images drawn from the inversion trials show the oil-water interface very well. The neglect of a narrow layer of a dozen meters having a strong contrast in conductivity with the terrain environment, is practically annulled for the signal measured at the surface, but reduces the resolution of the oil-water boundary in 4D inversion. A high level of knowledge of the distribution of electrical conductivity for the entire terrain environment is therefore necessary for the inversion of 4D CSEM data. Iv
Nony, Emmanuel. "Production et caractérisation de l'allergène recombinant Bet v 1 utilisé à des fins d'immunothérapie allergénique." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA114801.
Full textRespiratory allergy to birch pollen affects a large number of people in the world. It is estimated that 100 million people are sensitized to the major allergen from birch pollen, namely Bet v 1. Allergen immunotherapy, based on the repeated administration of the allergen of interest, allows the modification of the patient's immune response from a TH2 to a TH1/Treg pattern and thus the reduction of allergic symptoms. This study was therefore aimed to produce and characterize the recombinant Bet v 1 (rBet v 1) allergen, for immunotherapy purpose.In this context, various analytical methods have been developed and applied in order to optimize the production of rBet v 1 via the reduction of process or product-related impurities as well as to document the quality of the purified allergen. In particular, the use of mass spectrometry has allowed the determination of the exact mass of the intact allergen and the complete verification of its amino acid sequence. Mass spectrometry data have also contributed to the detection and identification of impurities and degradation products and have therefore led to several optimizations of the industrial process for the production of the recombinant allergen. Immunological activities of certain degradation products were also investigated and the allergen tertiary structure was determined by X-ray diffraction. Finally, this study was decisive in order i) to establish rBet v 1 as a chemical reference substance for the European Pharmacopoeia as well as ii) to perform a phase II clinical study conducted in 483 patients with birch pollen-induced rhinoconjunctivitis
Kirley, Rachel B. "The Education and Practical Experience of Theatrical Production Managers." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1117392085.
Full textOverton, Cynthia. "Costume Design and Production of A Midsummer Night’s Dream." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586024906746483.
Full textSouza, Almir Antonio Cunha de. "Aplicação da metodologia tambor-pulmão-corda (tpc) com supermercado na gestão de manufatura de eletrodos de grafite das unidades de candeias, e monterrey da graftech international ltd." Universidade Federal da Bahia, 2006. http://www.adm.ufba.br/sites/default/files/publicacao/arquivo/005.pdf.
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O Gerenciamento das Restrições (GR) parte do pressuposto de que a meta de qualquer empresa é ganhar mais dinheiro no presente, bem como no futuro. A Teoria das Restrições é um conjunto de soluções embasadas na Teoria do Caos, que busca o desempenho global do sistema, pela gestão de seus poucos recursos críticos. Esta teoria é aplicada a qualquer empresa, já que estas, por natureza, têm característica sistêmica. O objetivo deste trabalho é avaliar a implantação da metodologia Tambor-Pulmão-Corda com Supermercado, resultante da Teoria das Restrições, na gestão do planejamento e programação de produção, nas unidades de fabricação de eletrodos de grafite da Graftech International Ltd., situadas em Candeias e Monterrey, no período de 2001 a 2004. Projeto piloto, aplicando esta metodologia, foi desenvolvido por um grupo de técnicos da Empresa e, posteriormente, foi aprovado para ser implantado nas demais unidades do grupo. A estratégia de pesquisa adotada foi o estudo de casos. Como resultados da implantação do modelo TPC com Supermercado, temos uma linguagem uniforme de planejamento e programação de produção entre as unidades estudadas e a Corporação, tendência de redução do nível de inventário e o entendimento comum de como gerir as restrições físicas a partir das cinco etapas da Teoria das Restrições: Identificar, explorar, subordinar, elevar e identificar a nova restrição. Por fim, chegamos à conclusão de que o modelo proposto não pode ser dado como implantado em nenhuma das duas unidades estudadas, e que as maiores dificuldades encontradas estão atreladas às restrições não físicas, principalmente no que se refere às políticas de vendas/marketing, contabilidade de custos e busca dos resultados de curto prazo.
Salvador
Milan, Patrícia. "Modelagem matemática para a otimização da produção de cafés finos: um estudo de caso." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11132/tde-30052008-160948/.
Full textCoffee production is a historical and traditional agricultural activity in Brazil which is going through a reformulation due to new qualitative and social demands in the international market. The importance of quality to coffee resides in attending the consumer needs and in representing a specific factor for price determination. The physical and organaleptic characteristics of coffee drinks are influenced by pre and post-harvest management of the culture. In this context the demand for special coffee makes it necessary to adopt new technologies to the production systems, to manage the culture and its administration, which allow increase in productivity and a product with good quality. This elevation in complexity within the coffee chain increases the importance given to the farmer\'s administration decisions, stimulating him to search for new supporting tools for analysis. Mathematical modeling presents itself as an assisting tool to decision making with successful applications in agriculture. Therefore, this study aims to optimize the management of a coffee farm. A case study was conducted at the farm Santa Maria da Boa Vista, located in Cristais Paulista district in the State of São Paulo. The production data of the farm was used to elaborate and validate the mathematical model for special coffee production optimization. This linear programming multiobjective model with one multiobjective function, three sets of countable restrictions, seven sets of technical restrictions and two sets of endogenous variables presented itself as capable of assisting in the farms production planning, in the determination of the harvest sequencing and of the optimal volume of special coffee production.
Lourenço, Ana Filipa Martins. "Nanocelluloses in the production of fine papers: influence on the process and on the product quality." Doctoral thesis, [do autor], 2020. http://hdl.handle.net/10316/93431.
Full textAs nanoceluloses são um material com imenso potencial, tendo vindo a ser exploradas para as mais diversas aplicações. A procura por materiais sustentáveis e amigos do ambiente está em linha com a natureza das nanoceluloses e portanto, estas têm surgido como o candidato perfeito na temática crucial da substituição dos plásticos, ou como aditivo na indústria alimentar, controlador reológico, para impressão 3D de diversas estruturas, entre muitas outras possibilidades. As suas peculiares propriedades, tal como reduzido tamanho e elevada área de superfície específica, bem como o potencial para elevada resistência mecânica, cristalinidade e transparência, combinadas com o facto de, tal como a celulose, provir de fontes renováveis e ter relativa facilidade de funcionalização, são os principais responsáveis pela elevada procura das nanoceluloses. Faz assim todo o sentido o seu uso na indústria do papel, um sector cada vez mais competitivo com uma forte componente de investigação e desenvolvimento de novos produtos afins com interessantes funcionalidades. A presente tese pretende explorar a influência das nanoceluloses no processo produtivo e na qualidade final de produtos papeleiros. O objectivo principal foi o de estudar as interacções entre estes novos nanomateriais e os diferentes componentes do papel. Uma vez que o trabalho foi efectuado em estreita cooperação com a indústria papeleira nacional, o plano experimental focou-se nos papéis finos de impressão e escrita e as nanocelulose foram adicionadas como aditivo na produção do papel ou à superfície deste, como agente de revestimento ou aditivo em formulações de colagem superficial. Estabeleceram-se assim vários objectivos, concordantes com as dificuldades identificadas e desafios propostos pela indústria, nomeadamente a) melhorar a resistência a seco e a húmido do papel, b) aumentar o conteúdo de cargas minerais, c) reduzir o conteúdo de fibra longa, d) reduzir a energia de refinação da pasta, controlando ao mesmo tempo parâmetros processuais como drenabilidade, quando se usam as nanoceluloses na produção do papel, mas também e) melhorar a qualidade de impressão quando usadas à superfície deste. Por forma a cumprir os objectivos propostos, pasta kraft de eucalipto branqueada foi usada para produzir diferentes tipos de nanocelulose com base em distintos processos de produção que conferiram propriedades específicas. O isolamento das fibrilas foi efectuado com recurso a tratamento mecânico intensivo, aplicando-se previamente tratamentos de hidrólise enzimática, oxidação mediada por TEMPO ou carboximetilação para facilitar a desestruturação dos materiais. De referir que todas as metodologias usadas se basearam na literatura existente. Para além disso, nanocelulose produzida por síntese bacteriana também foi testada. As diferentes nanoceluloses produzidas deram origem a diversos resultados quando aplicadas na produção de papel. Ao serem usadas na matriz fibrosa revelou-se de extrema importância o estudo das suas interacções com as cargas minerais e neste sentido efectuou-se uma análise detalhada dos processos de floculação de carbonato de cálcio por recurso a espectrometria de difracção laser. Foi possível produzir flocos de PCC, cujas características dependem das nanoceluloses usadas. Para tal, concluiu-se ser necessário a) ocorrer fibrilação aquando da produção das nanoceluloses, o que foi possível quando se pré-tratou a pasta antes do isolamento mecânico e b) controlar a extensão da modificação química, uma vez que uma carga demasiado elevada conduziu ao reverso da floculação. Para além disso, o processo de floculação pôde ser controlado pelo ajuste das características das nanoceluloses usadas, nomeadamente o seu grau de polimerização e carga. Ao serem adicionadas à matriz fibrosa, as nanoceluloses melhoraram de uma forma geral as resistências mecânicas. As amostras com maior potencial revelaram ser as produzidas com recurso a hidrólise enzimática, uma vez que permitiram alcançar todos os objectivos propostos. Ademais, pelo seu uso, foi possível substituir a necessidade de uso de agentes de retenção comuns, emergindo assim como um substituto ecológico destes aditivos sintéticos. Relativamente às nanoceluloses funcionalizadas, foi também possível obter resultados interessantes. Por um lado, foi possível estabelecer um limite ideal para o conteúdo de grupos carboxílicos, uma vez que uma carga demasiado elevada ou um tamanho de fibrilas muito diminuto demonstraram ser prejudiciais na produção de papel. Por outro lado, concluiu-se que, devido à sua carga altamente negativa, estas interagem preferencialmente com os aditivos papeleiros, que são catiónicos, e portanto o efeito de reforço foi apenas conseguido na ausência dos referidos aditivos. A drenabilidade do processo foi sempre afectada negativamente na presença das nanoceluloses. No entanto, apresentaram-se algumas estratégias baseadas no aumento do conteúdo de cargas minerais, que podem ajudar a reduzir esta limitação. Finalmente, as nanocelulose foram adicionadas à superfície do papel, seja como agente de revestimento ou como aditivo a formulações de colagem superficial, com o intuito de melhorar a qualidade de impressão. A conhecida capacidade de estabelecer fortes redes interligadas levou a uma estrutura papeleira fechada, capaz de reter os pigmentos da tinta de forma mais eficaz. Adicionalmente, quando combinadas com amido, revelaram estabelecer uma relação sinergística muito interessante e pela adição de 5% de nanoceluloses foi possível melhorar consideravelmente a qualidade de impressão. Conclui-se assim que as nanoceluloses podem ser produzidas de forma a satisfazer as necessidades da indústria papeleira. De salientar que este é um novo bioproduto com potencial de mercado, produzido a partir da matéria-prima principal deste sector produtivo. Desta forma, não só a indústria papeleira estará a melhorar a qualidade do produto final, mas também a acrescentar valor a um dos seus produtos intermediários.
The Navigator Company
Shiels, Rebecca Anne. "Synthesis, characterization, and evaluation of silica and polymer supported catalysts for the production of fine chemicals." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/29629.
Full textCommittee Chair: Dr. Christopher Jones; Committee Member: Dr. Dennis Hess; Committee Member: Dr. Hang Lu; Committee Member: Dr. Marcus Weck; Committee Member: Dr. Pradeep Agrawal. Part of the SMARTech Electronic Thesis and Dissertation Collection.