Tesis sobre el tema "Granulats naturels"
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Martaud, Thomas. "Evaluation environnementale de la production de granulats naturels en exploitation de carrière : indicateurs, modèles et outils". Orléans, 2008. https://tel.archives-ouvertes.fr/tel-00412080.
Texto completoClavier, Martial. "Caractérisation environnementale de matériaux de construction à l'aide de nouvelles normes de lixiviation : étude expérimentale et numérique". Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1284.
Texto completoWith the development of the circular economy in the construction sector, alternative materials have emerged from industrial by-products and waste to reduce the use of traditional natural materials. However, their use requires ensuring that they do not release harmful substances when in contact with the environment. To this end, efforts have been made in Europe in recent decades to develop leaching standards adapted to construction products, recently published. In parallel, in France, environmental acceptability guidelines have been published to assess the environmental performance of alternative materials used in road construction, mainly based on the batch leaching standard EN 12457. The differences between the new European test standards and this standard used in France raise a need for the industry to adapt. This thesis aims to examine the results of the new European tests on a range of French materials of different natures and to seek to shorten these tests while maintaining good reliability. The setup of the tests and their validation was first carried out. Forty-three granular samples (natural, recycled, from MIDND, and sediments) of various grain sizes and nineteen monolithic products (concrete, asphalt, and MTLH) composed of at least one aggregate studied alone were characterized in this work by ascending current percolation tests, dynamic surface leaching, and/or batch leaching. Several physico-chemical characterization tests were conducted to better explain certain leaching mechanisms: acid digestion, SEM-EDX, XRD, pH-dependent test. Finally, a study of correlations between the results of leaching tests, and the development of a geochemistry-transport coupling model using the GEMS software were carried out to provide tools for shortening the tests. The results obtained show the existence of trends in the release of regulated hazardous substances, and sometimes in their release mechanisms, depending on the nature of the material. Particle size has an influence on leaching behavior, while adding binder to an aggregate often inhibits leaching from it, but sometimes induces new releases. Differences in the action of limiting releases from aggregates by hydraulic binders and hydrocarbon binders have been highlighted. The established correlations provide tools to justify the use of either batch leaching tests or short versions of European tests as replacements for the latter. Finally, the developed models correctly predict the release of certain substances but require further study to improve them
Bouarroudj, Mohamed ElKarim. "Utilisation de matériaux naturels modèles pour la formulation de mortier contenant des sables et des fines de granulats recyclés". Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2019. http://www.theses.fr/2019MTLD0016.
Texto completoRecycled concrete aggregates (RCA) are not enough used in the construction sector, mainly because of their high water absorption capacity. These fine particles are composed of crushed natural aggregate and adherent hardened cement paste. The first part of this work consists in valuing particles smaller than 4 mm of an RCA in a mortar composition. Thus, the fresh and hardened behavior of mortar performed with recycled fine aggregate and model natural aggregate have been compared. The natural model fine aggregate has been performed to have an equivalent physical characteristics with the recycled one. This approach helped to understand the hardened behavior of the mortar made with recycled fine aggregate. The second part of this work consists in finding a recovery track for particles smaller than 125 μm of RCA, the goal is to use them as mineral addition. A characterization work show that the recycled powder is porous, thus a theoretical model and an experimental methodology allowing to estimate this porosity are developed. Finally, a comparison between mortar made with a limestone powder, and a recycled powder are compared. The results show that the recycled powder can be used as mineral additive in mortar composition
OUALI, ABDELLAH. "Etude experimentale du lessivage des alcalins et du silicium extractibles des granulats naturels apport au probleme de l'alcali-reaction dans les betons". Paris 6, 1997. http://www.theses.fr/1997PA066491.
Texto completoMnif, Ines. "Devenir des floculants à base de polyacrylamide dans un site de granulat : interactions avec les solides naturels et photodégradation". Thesis, Nice, 2015. http://www.theses.fr/2015NICE4032/document.
Texto completoPolyacrylamide (PAM) based floculants are produced from the highly toxic acrylamide (AMD) monomer and can contain residual amounts (up to 0.1% in Europe) of AMD. After they are used to facilitate liquid/solid separation of process water in aggregate quarries, PAM floculants are stored, with the sewage sludge, in decantation lagoons. Dissemination of AMD and PAM to groundwater and surface water from these lagoons can occur. In this work, we aimed to study the interactions of AMD and PAM with sludge particles and clays (kaolinite and illite used for decantation lagoon sealing) from aggregate quarry. To correctly quantify the AMD, analytical method based on HPLC/MS/MS with direct injection was developed. This method was validated according to the Afnor guidelines (NF T 90-210 and NF T 90-220) with a limit of quantification of 1 µg/L. Results of AMD adsorption experiments showed a low adsorption of AMD to sludge and clay (kaolinite and illite) particles, which is independent of time, AMD concentration and pH. Inversely, PAM was found to adsorb strongly and irreversibly to sludge, kaolinite and illite with a rapid kinetic of adsorption which consists of first order kinetic. Adsorption isotherms are well correlated with Langmuir and Freundlich models. PAM adsorption quantities are independent on the pH of suspensions, but are strongly impacted by the ionic strength which affects electrostatic interactions between PAM and solid surfaces
Themeli, Andrea. "Etude du potentiel d'emploi des bitumes naturels dans la production des liants bitumineux durs et des enrobés à module élevé". Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAD020.
Texto completoThe aim of this thesis is to study the potential of a natural bitumen (NB) mined in Albania in the production of hard bitumens (HB) and that of high modulus asphalt concrete (HMAC). Various petroleum refining techniques are available for the production of HB. Nevertheless, this is impossible with some crude oils. In addition, HB from refineries often present shortcomings which limit their applications. These reasons, coupled with practical issues related to HB supply, motivate the research of alternative methods. In this industrial context it is interesting to use NB. This study has shown that the Albanian NB provides HB and HMAC in accordance with European Standards, resistant to aging and relatively performant at low temperatures. The proper dosage of this NB allows the formulation of materials of desired properties, in response to the technical requirements of the considered road applications, facilitating in this way the use of bitumen stocks in asphalt concrete production plants
Achour, Taoufik. "Étude de l’influence de la nature des granulats sur les propriétés des bétons hydrauliques : cas des granulats calcaires tunisiens". Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10105/document.
Texto completoThis study concerns the Tunisian granular resources, of limestone type, in the hydraulic mixtures. The used materials outcoming from the careers of Aïn Tebournouk, Nahli, Jbel Ressas, El Haoureb, Jradou and Tahent which have to feed the principal centers of consumption of the area of Tunis and the coastal zone of Center-East. The analyzed properties are the compressive and the tensile strengths and the elastic modulus. The recent models of the French LCPC were used to predict these properties. They do not always give satisfactory results, in particular if the mixtures are rich in fine elements, as it is often the case of the aggregates outcoming from careers. The mortars, micro-concretes and concretes carried out within the framework of this study made it possible to propose an extension of these models. For the compressive strength, the bond coefficient was associated with the content of fillers aggregates. The assumption is that the presence of these fine elements, of comparable nature that the aggregates, improves adherence paste and aggregate, thanks to bringing together the properties of rigidity of the two materials. For the tensile strength, a model describes by a hyperbolic law made it possible to provide a physical interpretation to the tensile strength behavior of the hydraulic mixtures. Its parameters are linked to the aggregate strength and cohesion in the paste-aggregate transition zone. Finally for the elastic modulus, the use of the model of the LCPC, which takes into account the properties of the granular phase and the binding phase, made it possible to reach the modulus of elasticity of some aggregates
Motta, Rafael Gonçalves da. "Evolução tectono-metamórfica do Domínio Serra da Natureza, Terreno Andrelândia, MG". Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/44/44143/tde-23112009-091116/.
Texto completoThe Andrelândia Terrain is located in the southern portion of the Brasília Fold Belt and it comprises metasedimentary pile that underwent relative high-pressure metamorphism during the Neoproterozoic. In the investigated area, the Andrelândia Terrain is composed, from bottom to top, by the Andrelândia and Liberdade nappes and the Serra da Natureza Klippe, and the last two belong to the Serra da Natureza Domain. The present work aims the characterization of geology, structure and petrology of rocks of the Serra da Natureza klippe and its context in relation to the Andrelândia Terrain. In the Andrelândia Nappe two kinds of lithotypes occur: the Santo Antônio Schist and Serra da Boa Vista Schist. Inside the nappe, rocks bearing staurolite-kyanite-biotite mineral assemblage are topped by rocks with kyanite-biotite-garnet, characterizing an inverted metamorphic pattern. Geothermobarometric calculating estimates P-T condition of 668±15 ºC and 9.1±0.7 kbar for rocks at the bottom and 665±17 ºC and 10.4±0.7 kbar for rocks at the top. The Liberdade Nappe is composed of metasedimentary rocks, with rare intercalations of amphibolite and metaultramafic rocks. At its base a migmatitic paragneiss dominates and a transition to schists with staurolite-kyanite occurs, at the top of structure, in a normal metamorphic pattern. P-T calculations yielded 714±29 ºC and 10.2±1 kbar to rocks at the base, 678±60 ºC and 8.4±1.3 kbar to rocks of middle portion, and 642±28 ºC and 8.2 kbar to rocks of upper part. It is the first detailed characterization of Serra da Natureza Klippe rocks, which is composed of granulitic paragneiss, in which leucosome-rearing garnet and kyanite are observed along with rutile-orthoclase-kyanite-garnet-quartz±plagioclase±biotite mesosome, without muscovite and staurolite. Thermobarometry in two samples yielded P-T conditions of 815 ºC and 15 kbar. The P-T paths inferred for rocks of the three units are consistent and parallel, and features related to retrometamorphism are recorded more intensively in rocks of the Liberdade Nappe and Serra da Natureza Klippe. In the first, replacement of kyanite by muscovite + staurolite and rutile by ilmenite are common; in the Serra da Natureza Klippe, there is replacement of kyanite either by sillimanite, or sillimanite + biotite ± muscovite, or muscovite + staurolite, rutile by ilmenite + zircon, garnet by biotite + quartz + feldspars ± sillimanite; and of orthoclase by muscovite. These observations give the initial exhumation rate of 5 kbar/50 ºC. All the three nappes are linked by S2, which is the main and parallel foliation in all of them. S1 is observed in the Andrelândia and Liberdade nappes, defining fold hinges that have S2 in axial plane position and is parallel to S0. S3 is locally developed. Late D4 and D5 deformation are responsible for large amplitude open folds, to the synform of Serra da Natureza Domain, as well as regional dome and basin interference pattern. Mineral and stretching lineations are associated with kinematic indicators, such as porphyroclast, asymmetric boundins, SC foliation and vergence of folds (D2), indicate transport to NNE. A second family of mineral and stretch lineations indicates transport to NW, associated with the disruption of D3 folds. Monazite grains have been dated by electron microprobe (EPMA). In the Liberdade Nappe, value of 622±6 Ma was obtained and is interpreted as the age of metamorphic peak. In the Serra da Natureza Klippe, a date of 616±16 Ma represents the age of metamorphic peak and the value of 602±7 Ma is interpreted as age of retrometamorphism, implying a cooling rate between 7 and 9 ºC/Ma. In the Andrelândia Nappe monazite dating yielded 586±10 Ma, what is correlated to the age of leucogranite intrusions and is interpreted as age of the progression of de Serra da Natureza Domain over the Andrelândia Nappe. Although the investigated rocks present different metamorphic stories, all of them, and their major structures, are connected by a single tectono-metamorphic event, with a high pressure and temperature metamorphic field gradient, which is similar to the rocks of High Himalayan, and typical of lower crust in collisional setting involving continental blocks.
Achour, Taoufik Lecomte André Ben Ouezdou Mongi. "Étude de l'influence de la nature des granulats sur les propriétés des bétons hydrauliques cas des granulats calcaires tunisiens /". S. l. : S. l. : Nancy 1 ; Ecole National d'Ingénieurs de Tunis, 2007. http://www.scd.uhp-nancy.fr/docnum/SCD_T_2007_0105_ACHOUR.pdf.
Texto completoThèse soutenue en co-tutelle. Titre provenant de l'écran-titre. Bibliogr.
Liu, Mingzhao. "Decouplage des systemes avec retards : simulation et commande optimale d'une installation de production des granulats". Nantes, 1988. http://www.theses.fr/1988NANT2041.
Texto completoMakani, Abdelkadir. "Influence de la nature minéralogique des granulats sur le comportement mécanique différé des bétons". Thesis, Toulouse, INSA, 2011. http://www.theses.fr/2011ISAT0005/document.
Texto completoThe prediction of the time-dependent deformations, particularly in the case of high performance concrete (HPC) envisioned for bridges is essential for predicting the deflections, the stress distribution in statically indeterminate structures and the loss of pre-stressing force in elements of pre-stressed concrete. However, the experience shows a certain dispersion of values of instantaneous and delayed deformations measured and some significant differences with the values calculated using the building codes.The objective of the present thesis work focuses on the coarse aggregate parameter which is not taken into account in building codes, which could causes the inaccuracies of their predictions. The experimental program includes a comparative study of the mechanical behaviours (instantaneous and delayed), shrinkage, creep, of six HPC with the same basic formulation (water cement ratio, volume of paste), differing principally in the type of coarse aggregate. From this database and thanks to the mechanical and physicochemical analyses of the aggregates, some influent parameters related to the type of the coarse aggregate were detected. The comparisons with estimations of standard models such as Eurocode 2 were also performed and showed significant differences with the experimental values.Micro-structural analyses were carried out in order to identify the state of the microstructure and the porosity of materials, more particularly at the interface between the cement paste and the coarse aggregate (Interfacial Transition Zones ITZ). The study of the results made it possible to establish correlations between the mechanical behaviour and the micro-structural analyses. A synthesis of the data collected during this research work shows that the coarse aggregate has a considerable influence on the mechanical behaviours (instantaneous and delayed) through various parameters from variable degree of influence
Geisler, Jacques-Louis. "Contribution à l'optimalisation de l'utilisation des matériaux locaux des bassins de la Moselle et de la Sarre dans le bâtiment et les travaux publics". Nancy 1, 1995. http://www.theses.fr/1995NAN10163.
Texto completoNiry, Razafinjato Rijaniaina. "Comportement des bétons à haute température : influence de la nature du granulat". Thesis, Cergy-Pontoise, 2015. http://www.theses.fr/2015CERG0757/document.
Texto completoHigh temperature behaviour of concrete : influence of the nature of the aggregates.This study deals with the influence of the nature of the aggregates on the behaviour of concrete undergoing to high temperature stress. Aggregate properties and concrete mechanical performances are usually classified into two categories based on chemical components: calcareous aggregates concretes and siliceous aggregates concretes. However, recent studies showed that high temperature behavior of aggregates within a same group of composition can be particularly different. The relevance of this distinction is discussed through these results.Firstly, a petrographic study (mineralogical composition) on two siliceous and two calcareous aggregates, representative of the two categories of composition is performed. Their physical properties (density, porosity, granular distribution) are determined. The evolution of mineralogical characteristics is performed through the identification of physico-chemical phenomena (mineralogical changes identified by XRD, TGA/DSC) happening during heating. It allows interpreting their influence on the evolution of specific heat capacity and thermal expansion of aggregates. The different scales observations made after heating/cooling cycles at different target temperatures until 750 °C allow the description and the evaluation of aggregates physical damage.Secondly, concretes and mortars (Weff./C = 0.6 and 0.3) are made with these aggregates (gravel and sand). Physico-chemical processes are identified and thermal expansion of mortar are measured during heating until 1000 °C. Hot thermal properties of concretes (conductivity, specific heat capacity, diffusivity) are measured until 300 °C and thermal response until 750 °C. Residual cracking is observed at macroscopic and microscopic scale (optical microscope and SEM). The evolution of porosity and mechanical residual properties (compressive strength, modulus of elasticity and tensile splitting strength) are assessed after heating/cooling cycle at different target temperatures until 750 °C
Storrar, Megan Denise. "Adsorption and desorption characteristics of natural organic matter in natural waters on granular activated carbon". Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27183.
Texto completoMcCrea, Genevieve Rosalind Art College of Fine Arts UNSW. "Self organization in nature". Publisher:University of New South Wales. Art, 2008. http://handle.unsw.edu.au/1959.4/43573.
Texto completoBoglaienko, Daria. "Capture and Densification of Floating Hydrophobic Liquids by Natural Granular Materials". FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3261.
Texto completoMcEwen, Jeff. "Electrochemical regeneration of natural organic matter (NOM) loaded granular activated carbon". Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26714.
Texto completoBispo, Sistanley Jones Lima. "Estudo das propriedades mec?nicas de biocomp?sitos de polipropileno refor?ados com fibras naturais". Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15649.
Texto completoThis research presents an approach to the addition of curau? fibers and licuri fibers in a polypropylene resin matrix, such as an alternative proposal to reinforce the polymeric composites. Fiber content of 0 %, 5 %, 10 %, and 20% were analyzed for verification of their mechanical properties comparing them, inclusive with the properties of polypropylene. The grainulated biocomposites had been prepared in an extrusora. The test bodies had been molded by injection and submitted to the mechanical essays uniaxial traction, flexion on three points, impact, in addition to thermal tests (HDT). These biocomposites had been also subjected the essay physicist-chemistry index of fluidity (IF). It was observed that the biocomposites of PP with 20% curau?, obtained bigger increase in the modulus of elasticity and a bigger reduction in the resistance to the impact. In the mechanical behavior, for all the biocomposites, these were increases in values of the limit of drainage and tension of rupture, when tested by uniaxial traction, as they added the fibers. Another important point was the increase of the resistance the flexion. It was also noted that the addition of fibers reduced the thermal degradation of the mixture natural fibers / polypropylene.
Esta pesquisa apresenta uma abordagem da adi??o de fibras de licuri e curau? em uma matriz de resina de polipropileno, essa como uma proposta alternativa de refor?o aos comp?sitos polim?ricos. Teores de fibras de 0 %, 5 %, 10 %, e 20 % foram analisados para verifica??o de suas propriedades mec?nicas comparando-as, inclusive com as propriedades do polipropileno. Os biocomp?sitos granulados foram preparados em uma extrusora. Os corpos de prova foram moldados por inje??o e submetidos aos ensaios mec?nicos de tra??o uniaxial, flex?o em tr?s pontos, impacto, al?m de ensaios t?rmicos (HDT). Estes biocomp?sitos tamb?m foram submetidos a ensaio f?sico-qu?mico de ?ndice de fluidez (IF). Observou-se que os biocomp?sitos de PP com 20% curau? obteve maior aumento no m?dulo de elasticidade, e uma maior diminui??o na resist?ncia ao impacto. No comportamento mec?nico, para todos os biocomp?sitos, houve acr?scimos nos valores do limite de escoamento e tens?o de ruptura quando ensaiados por tra??o uniaxial, ? medida que se adicionavam as fibras. Outro ponto importante foi o aumento da resist?ncia ? flex?o. Verificou-se tamb?m que a adi??o de fibras reduziu a degrada??o t?rmica da mistura fibras naturais / polipropileno.
Xing, Zhi. "Influence de la nature minéralogique des granulats sur leur comportement et celui du béton à haute température". Phd thesis, Université de Cergy Pontoise, 2011. http://tel.archives-ouvertes.fr/tel-00624785.
Texto completoZachman, Bradley A. "Understanding and predicting natural organic matter adsorption by granular activated carbon columns". Diss., Connect to online resource, 2005. http://wwwlib.umi.com/cr/colorado/fullcit?p1430179.
Texto completoLiu, Zhina. "Kinematics and Internal Deformation of Granular Slopes". Doctoral thesis, Uppsala universitet, Institutionen för geovetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-223792.
Texto completoJonsson, Kajsa. "KONSTGRÄSPLANER SOM MILJÖFARLIG VERKSAMHET : En undersökning av kommunernas arbete med att minska spridningen av mikroplaster". Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-182291.
Texto completoCousin, Bruno. "Séchage du caoutchouc naturel sous forme de granulés ; analyse théorique et expérimentale des processus internes". Montpellier 2, 1990. http://www.theses.fr/1990MON20054.
Texto completoGhyoot, Marianne. "Le pedicellaire globifère de sphaerechinus granularis (Echinodermata, Ecdhinoidea): morphologie et comportement d'un appendice défensif". Doctoral thesis, Universite Libre de Bruxelles, 1991. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/213043.
Texto completoCortas, Rachid. "Nouvelle approche expérimentale pour la maîtrise de la fissuration du béton jeune : influence de la nature et de la saturation des granulats". Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209672.
Texto completovérifiée. Un nouveau dispositif expérimental a été développé dans le but de mieux décrire l’évolution de la résistance et de la capacité de
déformation en traction du béton jeune. Les indicateurs globaux (macroscopiques) apparaissent plus sensibles que les indicateurs de la microstructure pour rendre compte des différences de comportement observées. L’évolution du module élastique, du retrait plastique et endogène corrélées à l’évolution de la capacité de déformation et de la résistance en traction permettent de mieux caractériser le risque
potentiel de fissuration par retrait empêché. La fin de prise correspond à une phase critique. L’influence de la saturation des granulats est
indirecte, et résulte des variations du rapport Eau d’ajout/Ciment, à rapport Eau efficace/Ciment constant. La nature des granulats intervient au niveau des évolutions relatives de la résistance en traction et du module élastique. La méthodologie peut être appliquée à l’étude d’autres types de bétons et d’autres paramètres de formulation.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Serifou, Mamery. "Béton à base de recyclats : influence du type de recyclats et rôle de la formulation". Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR15230/document.
Texto completoWaste management is an important issue for Côte d‟Ivoire. Among many possibilities, recycling wastes as aggregates for concrete is a solution that deserves to be evaluated. In this study four recycled aggregates are tested: crushed glass, tire cut rubber, hardened cement and fresh concrete waste. There properties are compared to those of natural aggregates.A first study is realized in Côte d‟Ivoire on glass, rubber and hardened cement. Concrete is realized and tested in compression (cylindrical 16x32 specimens). A mix with an increasing quantity of coarse aggregates is tested for each recycled material (20 %, 25 %, 30 % and 50 % in mass of fine and coarse aggregates). It is shown that the strength decreases with the replacement rate and that the decrease depends on the replacing material. The materials ranged in the following increasing order: rubber, glass, hardened cement and natural aggregates. A power law is established which gives the compressive strength as function of the mix and the materials characteristics. Analytical modeling was proposed for predincting the strength with respect to recycled aggregates size and volume.Another experiment is also made on glass and rubber, where partial replacement in increasing percentage is tested. Natural aggregates are partially replaced in the mix with the ranges of 5, 10, 20, 25 and 30 % by rubber and glass. The compressive strength is determined and a decrease is observed for the two materials. In the case of rubber a high decrease in observe with the replacement. In the case of glass a decrease occurs between 0 and 5 % replacement then the strength remains constant with the replacement rate. The third experiment is made with partial replacement of fresh recycled concrete (excess of ready-mixed concrete from concrete mixing plant which is hardened and then crushed). A plan of experiments is made which allows a polynomial law to be drawn giving the strength as a function of the recycled proportion. Other properties (Young modulus, P wave velocity, porosity, density, etc) have been determined and their relation with replacement rate computed
VERSTRAETE, Johan. "Approche multi-technique et multi-échelle d'étude des propriétés structurales des matériaux hétérogènes : Application à un granulat siliceux naturel". Phd thesis, Université de Haute Alsace - Mulhouse, 2005. http://tel.archives-ouvertes.fr/tel-00010494.
Texto completoVerstraete, Johan Jean-Claude Camille. "Approche multi-technique et multi-échelle d'étude des propriétés structurales des matériaux hétérogènes : application à un granulat silicieux naturel". Mulhouse, 2005. http://www.theses.fr/2005MULH0788.
Texto completoA multi-technique and multi-scale approach was developed in order to study the structural properties of heterogeneous materials. Different techniques were used: Environmental Scanning Electron Microscopy, X-Ray Diffraction, X-ray absorption spectroscopy and Nuclear Magnetic Resonance. Correlations between the results obtained at different scales enabled to increase the comprehension of the structural deterioration of a SiO2 aggregate due to the Alkali-Silica Reaction processes. At the long-range order the structural changes appear mainly by the formation of amorphous phase. According to the NMR, this phase consists of a mixture of silanols and amorphous silica. This product that have a random composition along the reaction process could be likely to cause formation of expansive product in the aggregate. At the short-range order, the changes observed in the vicinity of silicon atoms make it possible to start again discussion on the supposed initiated step of the reaction
Sund, Hanna. "Mikroplastförluster från konstgräsplaner via snöröjning : En kvantitativ studie samt kostnad-nyttoanalys av hanteringsmetoder för granulat". Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415499.
Texto completoAl-Attas, Omar. "Competitive Adsorption of Iron and Natural Organic Matter in Groundwater Using Granular Activated Carbon". Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23349.
Texto completoFrancisco, Richard Fonseca [UNESP]. "Contribuição metodológica à estimativa da vulnerabilidade natural e perigo de contaminação de aquíferos livres granulares". Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153699.
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Diante da importância das águas subterrâneas para os diversos usos, particularmente o abastecimento público, e considerando os crescentes impactos nas reservas subterrâneas decorrentes de superexplotação, bem como a degradação da qualidade da água por atividades antrópicas, torna-se imprescindível o estabelecimento de instrumentos de planejamento, gestão do uso e proteção dos recursos hídricos subterrâneos. Por esta razão, o objetivo principal desta pesquisa foi apresentar uma proposta metodológica para avaliar a vulnerabilidade natural e perigo de contaminação de aquíferos livres granulares, a partir de uma abordagem centrada na integração entre o parâmetro de Dar Zarrouk denominado condutância longitudinal unitária e demais fatores que interferem na estimativa destes processos. Para tanto, os métodos SDR e SDR-PERIGO foram desenvolvidos e aplicados experimentalmente no Aquífero Rio Claro, no município de Rio Claro/SP, a fim de estimar a vulnerabilidade natural e perigo de contaminação, respectivamente. A espessura e a resistividade elétrica da zona não saturada, utilizadas para o cálculo da condutância longitudinal unitária, foram obtidas através do processamento e análise de sondagens elétricas verticais. Os demais fatores empregados foram a declividade, taxa anual de recarga do aquífero e uso e cobertura do solo. Os pesos de influência dos fatores foram determinados com o auxílio da Análise Hierárquica de Processos, a fim de reduzir a subjetividade e eventuais erros inerentes à tomada de decisão. Em seguida, os mapas de fator foram integrados em ambiente SIG, com base na Análise Multicritério, por meio da aplicação do método da Combinação Linear Ponderada. No que se refere ao método SDR, toda a área de estudo apresentou vulnerabilidade natural alta, resultado compatível com aqueles reportados em trabalhos anteriores e conforme o esperado, considerando as características dos sedimentos areno- argilosos da Formação Rio Claro. Com relação ao método SDR-PERIGO, o perigo é alto em aproximadamente 72% da área de estudo, devido à associação entre a alta vulnerabilidade natural e atividades potencialmente poluidoras. De modo geral, locais com alto perigo de contaminação foram relacionados, principalmente, à área urbano- industrial e aos cultivos de cana-de-açúcar e de cítricos. Áreas com perigo de contaminação baixo ou nulo foram encontradas onde ocorrem tipos de uso e cobertura da terra com potencial de contaminação insignificante, como vegetação natural e áreas úmidas. No que se refere aos métodos SDR e SDR-PERIGO, a análise integrada da condutância longitudinal unitária e demais parâmetros forneceu resultados robustos, sendo vantajosos sob o ponto de vista da praticidade na utilização e do número reduzido de parâmetros requeridos. Assim, estes métodos poderão ser empregados como alternativas àqueles considerados tradicionais e já consagrados na literatura pertinente, podendo constituir, futuramente, importantes ferramentas para a proteção de aquíferos livres granulares.
Considering the importance of groundwater for several uses, particularly the public supply, and considering the increasing impacts on groundwater reserves due to overexploitation, as well as the degradation of water quality by anthropogenic activities, it becomes essential to establish tools for planning, management of the use and protection of groundwater resources. For this reason, the aim of this research was to present a methodological proposal to assess the natural vulnerability and hazard to contamination of the granular unconfined aquifers, by means of an approach focused on the integration between the Dar Zarrouk parameter denominated Longitudinal Unit Conductance and other factors that interfere in the estimation of these processes. In order to evaluate the natural vulnerability and hazard to contamination, the SDR and SDR-HAZARD methods were developed and experimentally applied in the Rio Claro Aquifer, in the Rio Claro municipality, São Paulo State, Brazil. The longitudinal unit conductance results from the ratio between the thickness of the unsaturated zone and its electrical resistivity, which were obtained by processing and analysis of vertical electrical soundings. Other factors were used, such as slope, annual rate of aquifer recharge and land use. Factor weights were determined with the aid of the Analytic Hierarchy Process, in order to reduce the subjectivity and eventual inconsistencies in the decision-making process. Posteriorly, the factor maps were integrated into GIS based on Multicriteria Analysis, through the application of the Weighted Linear Combination method. Regarding the SDR method, the entire study area presented high natural vulnerability, a result compatible with those reported in previous studies and as expected, considering the characteristics of sandy-clay sediments of the Rio Claro Formation. With respect to the SDR-HAZARD method, the hazard is high in approximately 72% of the study area, due to the association between high natural vulnerability and potentially polluting activities. Generally, places with high contamination hazard were mainly related to industrial and urban areas, including sugarcane and citrus crops. Areas with low or null contamination hazard were found where there are types of land use with negligible potential contamination, such as natural vegetation and wetlands. As regards the SDR and SDR-HAZARD methods, the integrated analysis of the longitudinal unit conductance and other parameters provided robust results, whose advantages are the practicality use and reduced number of required parameters. Thus, these methods may be employed as alternatives to those considered traditional and already established in the related literature, providing, in the future, important tools for the protection of granular unconfined aquifers.
Francisco, Richard Fonseca. "Contribuição metodológica à estimativa da vulnerabilidade natural e perigo de contaminação de aquíferos livres granulares /". Rio Claro, 2018. http://hdl.handle.net/11449/153699.
Texto completoBanca: João Carlos Dourado
Banca: José Luiz Albuquerque Filho
Banca: Otávio Coaracy Brasil Gandolfo
Banca: Vagner Roberto Elis
Resumo: Diante da importância das águas subterrâneas para os diversos usos, particularmente o abastecimento público, e considerando os crescentes impactos nas reservas subterrâneas decorrentes de superexplotação, bem como a degradação da qualidade da água por atividades antrópicas, torna-se imprescindível o estabelecimento de instrumentos de planejamento, gestão do uso e proteção dos recursos hídricos subterrâneos. Por esta razão, o objetivo principal desta pesquisa foi apresentar uma proposta metodológica para avaliar a vulnerabilidade natural e perigo de contaminação de aquíferos livres granulares, a partir de uma abordagem centrada na integração entre o parâmetro de Dar Zarrouk denominado condutância longitudinal unitária e demais fatores que interferem na estimativa destes processos. Para tanto, os métodos SDR e SDR-PERIGO foram desenvolvidos e aplicados experimentalmente no Aquífero Rio Claro, no município de Rio Claro/SP, a fim de estimar a vulnerabilidade natural e perigo de contaminação, respectivamente. A espessura e a resistividade elétrica da zona não saturada, utilizadas para o cálculo da condutância longitudinal unitária, foram obtidas através do processamento e análise de sondagens elétricas verticais. Os demais fatores empregados foram a declividade, taxa anual de recarga do aquífero e uso e cobertura do solo. Os pesos de influência dos fatores foram determinados com o auxílio da Análise Hierárquica de Processos, a fim de reduzir a subjetividade e eventuais erros inere... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Considering the importance of groundwater for several uses, particularly the public supply, and considering the increasing impacts on groundwater reserves due to overexploitation, as well as the degradation of water quality by anthropogenic activities, it becomes essential to establish tools for planning, management of the use and protection of groundwater resources. For this reason, the aim of this research was to present a methodological proposal to assess the natural vulnerability and hazard to contamination of the granular unconfined aquifers, by means of an approach focused on the integration between the Dar Zarrouk parameter denominated Longitudinal Unit Conductance and other factors that interfere in the estimation of these processes. In order to evaluate the natural vulnerability and hazard to contamination, the SDR and SDR-HAZARD methods were developed and experimentally applied in the Rio Claro Aquifer, in the Rio Claro municipality, São Paulo State, Brazil. The longitudinal unit conductance results from the ratio between the thickness of the unsaturated zone and its electrical resistivity, which were obtained by processing and analysis of vertical electrical soundings. Other factors were used, such as slope, annual rate of aquifer recharge and land use. Factor weights were determined with the aid of the Analytic Hierarchy Process, in order to reduce the subjectivity and eventual inconsistencies in the decision-making process. Posteriorly, the factor maps were integ... (Complete abstract click electronic access below)
Doutor
Copi, Cecilia. "Efeito da lesão embrionaria nos granulos lisossomo-secretores das celulas natural killer uterinas de camundongos". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316867.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: Durante a gestação normal em primatas e em roedores observa-se o acúmulo de linfócitos natural killer no ambiente uterino (uNK). A funções comprovadas das células uNK estão relaciondas com o reconhecimento das células trofoblásticas alogênicas e produção de citocinas imunomoduladoras do ambiente uterino que garantem o sucesso da gestação. Além da produção de citocinas envolvidas na homeostase do ambiente uterino, as uNK produzem e estocam nos seus grânulos moléculas citotóxicas como a perforina e granzimas. Estas moléculas estão envolvidas na resposta imune inata das células NK, com potencial de promover a lise de células alvo. Porém, se ocorre a ativação desta atividade citolítica, ou mesmo se as uNK promovem a secreção deste arsenal de moléculas citolíticas no ambiente uterino em gestação normal, ou em casos de interrupção da gestação, não são conhecidas. Os conhecimentos nesta área não avançam pelas limitações éticas de estudar experimentalmente o ambiente uterino em gestantes humanos e a falta de modelos experimentais estabelecidos em animais laboratoriais. No presente trabalho, propos-se utilizar o modelo experimental de indução de lesões embrionárias para provocar o desequilíbrio do ambiente uterino e avaliar as alterações nas células uNK. Para tanto, foram utilizados camundongos prenhes no 9° dia de gestação que foram submetidas à procedimentos cirúrgicos de lesão do embrião. Amostras uterinas dos sítios de desenvolvimento embrionários de animais de gestação normal, dos animais com embriões lesionados nos intervalos de 10, 30 e 60 minutos póslesão, e dos animais manipulados cirurgicamente sem a lesão embrionária foram coletados e processados para avaliações através de métodos citoquímicos e imunocitoquímicos em microscopia de luz e eletrônica de transmissão. Os sítios uterinos de embriões lesionados apresentaram reação hiperêmica na região mesometrial já aos 10 minutos pós-lesão, que se acentuava nos períodos mais longos de pós-lesão. As células uNK presentes nesta região apresentaram alteração na reatividade pela citoquimica de lectina DBA e immunocitoquímica com a anti-perforina, sendo evidente a gradual redução na intensidade das reações no decurso do tempo pós-lesão. Na análise ultra-estrutural verificou-se a desestruturação dos grânulos lisossomo-secretores, sendo notória a perda do conteúdo do compartimento secretor evidenciada pela reação com o azul-cuprolínico. O compartimento lisossomal do grânulo embora sofra também uma desestruturação pronunciada, mantêm a reatividade para anti-catepsina D, sugerindo a preservação de parte da sua funcionalidade. A perda do conteúdo do compartimento secretor, notadamente a perforina e os proteoglicanos no período de 10 minutos pós-lesão, sugere a degranulação das uNK e portanto a ativação da atividade citotóxica destas células, numa resposta aguda frente ao desequilíbrio do ambiente uterino afetado pela lesão embrionária. Porém, não foi constatado qualquer indício morfológico da ocorrência da degranulação através do mecanismo exocitose-símile ou ainda, o efeito da ação citolítica sobre as células circunjacentes às uNK ativadas
Abstract: In the uterine environment during normal pregnancy of primates and rodents is seen the accumulation of natural killer lymphocites (uNK). The confirmed functions of uNK cells are related to recognition of allogeneic trophoblast cells and production of immunomodulating cytokines of uterine environment that assure the successful pregnancy. Besides the production of cytokines related to homeostasis of uterine environment, the uNK produce and store citotoxic molecules of perforin and granzymes in their granules. These molecules are involved in the innate immune response of NK cells with potential to promote lysis of target cells. However, whether the lytic activity is triggered or even the uNK promotes the secretion of these sets Df cytolitic molecules into the uterus of normal pregnancy or in the miscarriages are not known. The advances of knowledge in this field are slow down due to ethical limitation of experimental studies with human pregnant uterus and lack of well established experimental models in laboratory animal. In the present work it was proposed to use the experimental model of induction of embryo lesions to promote the unbalance of uterine environment and evaluated the changes in uNK cells. Pregnant mice on 9° gestational day were submitted to surgical procedure of embryo lesion and uterine samples from these embryo lesioned sites were collected after 10, 30 and 60 minutes, as did the normal pregnant and sham operated animais. The samples were processed for cytochemical and immunocytochemical evaluations in light and transmission electron microscopy. The embryo lesioned uterine sites showed hyperemic reaction in the mesometrial region as soon as 10 min after lesion which increased as increased the time lapse after lesion. The uNK cells found in these regions showed reactivity changes with DBA lectin cytochemistry and with anti-perforin immunocytochemistry, being noticed the gradual reduction on reaction intensities on course of time after lesion. In the ultrastructural analysis were seen the disruptions of secretory-Iysosomes granules with notorious lost of secretory compartment contents as were evidenced by cuprolinic blue cytochemical reaction. In spite of structural organization of lysosome compartment of the granules was also affected it was maintained the anti-cathepsin D positive reaction which suggest the preservation of part of its functionality. The secretory compartment contents lost, notably the perforin and proteoglycans at 10 min after embryo lesion suggest degranulations of uNK and therefore an acute response of these cells by activation of citotoxic activity, under effects of unbalance of uterine environment affected by embryo lesion. However, it was not detected any morphological evidence of degranulation by exocytosis-like mechanism or even, the cytolitic effect on neighbor cells around the activated uNK cells
Mestrado
Histologia
Mestre em Biologia Celular e Estrutural
Castioni, Diego. "Studio di flussi granulari secchi riprodotti in laboratorio a media scala: Elaborazione di un modello applicabile a casi naturali". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8943/.
Texto completoMenager, Mickaël. "Rôles de hMunc13-4 et Rab27a dans la maturation et l'exocytose des granules cytotoxiques". Paris 7, 2008. http://www.theses.fr/2008PA077102.
Texto completoSeveral human inherited disorders are characterized by a functional impairment of the granule dependent cytotoxic pathway. Molecular characterization of these human conditions allowed to identify critical effectors of this cytotoxic pathway and highlighted the essential role of the cytotoxic activity in lymphocyte homeostasis. According to our previous work, the protein hMunc13-4 and Rab27a are one of these effectors which anomalies lead to Hemophagocytic Syndrom, in the context of Familial Hemophagocytic Lymphohistiocytosis type 3 and Griscelli Syndrome type 2. Here we show that the granule-dependent cytotoxic fonction of cytotoxic T lymphocytes and Natural Killer cells requires the cooperation of two types of organelles, the lytic granule and an endosomal-like "exocytic vesicle". In a first step of the secretory pathway, hMunc!3-4, independently of Rab27a, mediates assembly of recycling and late endosomal structures to constitute a pool of endosomal vesicles engaged into the regulated exocytic pathway. Cytotoxic-target cell recognition induces a rapid polarization of both types of organelles, which overlap and likely fuse at the cell-cell contact. In addition, hMunc13-4 has been identified as one of the effectors of Rab27a, potentially Connecting granule docking to granule priming at the Immunological Synapse. We have also shown that Rab27a recruits a previously unknown hematopoietic form of Slp2a (Slp2a-hem) on vesicular structures in peripheral CTLs. Following CTL-target cell conjugate formation, the Slp2a-hem/Rab27a complex colocalizes with perforin-containing granules at the immunological synapse, where it binds to the plasma membrane through its C2 domains
Bouden-Romdhane, Nejla. "Contribution a l'etude de la fragmentation des massifs rocheux a l'explosif". Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0026.
Texto completoAndrade, Leonardo de Brito. "Análise da influência da substituição do agregado miúdo natural por materiais granulares porosos residuais na fase plástica de concretos". Florianópolis, SC, 2008. http://repositorio.ufsc.br/xmlui/handle/123456789/91865.
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A influência da incorporação de materiais granulares reciclados na fase plástica de concretos é analisada nesta pesquisa. Os agregados reciclados são provenientes de resíduos (RES) de construção e demolição (RCD) e da queima do carvão mineral para geração de energia (CZP) em substituição ao agregado miúdo natural. Substituições parciais e totais foram realizadas. Inicialmente, uma metodologia de substituição dos RES é proposta, já que há grande dificuldade para o estabelecimento preciso da equivalência de volume entre os RES em relação ao agregado miúdo natural (AGN). Ensaios de absorção de água por capilaridade foram executados em amostras granulares de mesclas AGN-RES e os resultados mostraram grande intensidade de absorção de água pelos RES em comparação ao AGN, principalmente por sua natureza porosa. A influência dos agregados reciclados RCD e CZP sobre a cinética de hidratação do cimento Portland foi analisada utilizando o ensaio de calorimetria semi-adiabática. Argamassas com proporcionamento dos materiais associado aos traços dos concretos para as medições dos parâmetros da fase plástica foram produzidas e os resultados mostraram uma importante influência dos RES. As argamassas com RCD e CZP mostraram uma tendência de aumento do valor dos parâmetros de calor estudados com o aumento do teor de RES. Nas argamassas com RCD, os principais efeitos foram: o potencial de contribuir com pontos extras de nucleação e uma possível retomada da hidratação de alguma parcela cimentícia anidra. Já nas argamassas com CZP foi devido principalmente ao calor específico menor e menor perda de calor, conseqüentemente maior quantidade de ar interno ao grão, aumentando o isolamento térmico da mistura, sem que houvesse perda de calor. A análise das modificações na fase plástica de três séries de concretos (S1, S2 e S3) pela incorporação de CZP foi estudada para os seguintes parâmetros: perda de água por exsudação e evaporação, cinética de calor de hidratação, evolução da pega e deformação por retração plástica. Os resultados mostraram que há influência significativa do tipo de dosagem da série e também que o agregado reciclado poroso poderá exercer uma função de reservatório de água para posterior liberação, para o caso de S1. Em S2 e S3 não há uma clara tendência nessa direção. Por fim, há grande possibilidade da aplicação desses resíduos em concretos sem que conduza a resultados negativos no desempenho de concretos no estado fresco. Isso se comprova por resultados positivos obtidos em alguns teores de substituição nas séries de concretos estudados, principalmente os maiores teores em S1 e menores teores em S2 e S3.
MOURI, HASSINA y J. R. KIENAST. "Relations de phases theoriques et naturelles dans le systeme kfmash : exemple des granulites a1-mg d'ihouhaouene (mole in ouzzal-hoggar-algerie)". Paris 7, 1995. http://www.theses.fr/1995PA077235.
Texto completoCarvalho, Erica de. "Análise da microbiota associada à ascídia Didemnum granulatum para a produção de metabólitos secundários bioativos". Universidade Federal de São Carlos, 2010. https://repositorio.ufscar.br/handle/ufscar/6969.
Texto completoUniversidade Federal de Sao Carlos
Studies of marine natural products in 20 years of research have revealed a wide variety of molecules with complex structures and hitherto unknown, and potent biological activities. The aims of this study were to isolate microbial strains associated with Didemnum granulatum, to fermentate such strains for the production of crude extracts and the screening of these extracts for bioactive secondary metabolites. For the isolation of the strains, six different culture media were prepared with artificial sea water: malt extract 2% and 3%, carrot/potato, corn, oat and GPY. The strains were cultivated for 30 days in 250mL of the same culture media. The crude extracts were obtained by partition with ethyl acetate. The extracts were sent for the cytotoxic activity bioassay and analyzed by thin layer chromatography (TLC) on silica gel plate (with absorption in UV-vis). Among the 26 extracts, samples DG (M3) 6'C and DG (M3) 5'C showed potent cytotoxic activity, samples DG (B) 13, DG (M3) 1 and DG (G) 2B a moderate activity. The analysis by TLC indicated the presence of bioactive secondary metabolites in the extracts. The strains were identified as bioactive three fungal: DG (M 3) 6'C (Penicillium sp.) DG (M3) 5'C (Cladosporium sp.) DG (M3) 1 (Aspergillus sp.) And two bacterial: DG (B) 13 (Aurantimonas sp.) DG (G) 2B (Nocardiopsis sp.). These were grown on a larger scale of broth (500 mL) and extracted after 7, 14, 21 and 30 days of incubation. We carried out a cleaning process of these extracts by solid phase extraction (SPE) column of silica gel derivatized with C18 (35 mL of eluent: 100% H2O, MeOH/H2O 1:1 and MeOH 100%). The fractions generated were analyzed by HPLC-UV-MS trying to find characteristic profiles of secondary metabolites. From the DG sample (M3) 6'C (A + B), was isolated and identified the compound 13- deoxy-fomenona previously obtained by Tirilly et al. in 1983. Although this compound is not unheard of, no literature reports of studies involving bioassays cytotoxic against tumor cells and even this compound has been isolated from other species of microorganisms other than the fungus Dicyma pulvinata.
Os estudos sobre produtos naturais marinhos, durante os ultimos 20 anos de pesquisa, revelaram uma grande variedade de moleculas com estruturas complexas e ate entao desconhecidas, alem de potentes atividades biologicas. Assim, os objetivos deste trabalho foram isolar linhagens de micro-organismos associadas a ascidia Didemnum granulatum, sua posterior fermentacao para a producao de extratos brutos e a analise destes extratos na busca por metabolitos secundarios bioativos. Para o isolamento das linhagens foram utilizados os seguintes meios de cultura preparados com agua do mar artificial: extrato de malte 2% e 3%, cenoura/batata, fuba, aveia e GPY. A fermentacao das linhagens foi feita em 250 mL dos mesmos meios de cultura sem agar, durante 30 dias. Os extratos brutos foram obtidos por particao com acetato de etila. Estes extratos foram enviados para bioensaio de atividade citotoxica contra celulas tumorais e analisados por cromatografia em camada delgada (CCD) em placa de silica gel (com diferentes reveladores). Dentre os 26 extratos, as amostras DG(M3) 6 C e DG(M3) 5 C apresentaram potente atividade citotoxica, as amostras DG(B)13, DG(M3)1 e DG(G)2B uma atividade moderada. As analises por CCD indicaram a presenca de metabolitos secundarios nos extratos bioativos. As linhagens bioativas foram identificadas como sendo tres fungicas: DG(M3)6 C (Penicilium sp.); DG(M3)5 C (Cladosporium sp.); DG(M3)1 (Aspergillus sp.) e duas bacterianas: DG(B)13 (Aurantimonas sp.); DG(G)2B (Nocardiopsis sp.). Estas foram cultivadas em escala maior de meio liquido (500 mL) e extraidas apos 7, 14, 21 e 30 dias de incubacao. Realizou-se um processo de limpeza destes extratos por extracao em fase solida (SPE) em coluna de silica-gel derivatizada com C18 (35 mL dos eluentes: H2O 100%, MeOH/H2O 1:1 e MeOH 100%). As fracoes geradas foram analisadas por CLAE-UV-EM buscando-se encontrar perfis caracteristicos de metabolitos secundarios. A partir da amostra DG(M3) 6 C (A+B), foi isolado e identificado o composto 13-desoxi-fomenona, previamente obtido por Tirilly et al. em 1983. Apesar deste composto nao ser inedito, nao ha relatos na literatura de estudos envolvendo bioensaios citotoxicos contra celulas tumorais e nem mesmo deste composto ter sido isolado de outras especies de microrganismos que nao seja do fungo Dicyma pulvinata.
Gustafsson, Åke. "Functional and molecular aspects of interferon action in human natural killer cells and other leucocytes". Doctoral thesis, Umeå universitet, Virologi, 1985. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-99342.
Texto completoDiss. (sammanfattning) Umeå : Umeå universitet, 1985, härtill 5 uppsatser.
digitalisering@umu
Surtiningsih, Suprapto Tini. "Mobilisation de P et CD de phosphates naturels par des bactéries et des champignons ectomycorhiziens en culture pure et dans la rhizosphère du pin sylvestre". Nancy 1, 1994. http://www.theses.fr/1994NAN10271.
Texto completoDe, Leeuw Frédéric. "Etude de la protéine CIRP et sa fonction dans le métabolisme des ARN messagers". Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210577.
Texto completoDoctorat en Sciences
info:eu-repo/semantics/nonPublished
Ouzegane, Khadidja. "Les granulites al-mg et les carbonatites dans la serie de l'in ouzzal : nature et evolution de la croute continentale profonde pendant l'archeen". Paris 6, 1987. http://www.theses.fr/1987PA066566.
Texto completoOuzegane, Khadidja. "Les Granulites Al-Mg et les carbonatites dans la série de l'In Ouzzal nature et évolution de la croûte continentale profonde pendant l'Archéen /". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37608648z.
Texto completoMonteau, Jean-Yves. "Contribution a l'automatisation des installations de concassage-criblage : modelisation des appareils, simulation statique". Nantes, 1987. http://www.theses.fr/1987NANT2038.
Texto completoLissaneddine, Amina. "Formulation d’adsorbant à base de matériaux naturels et leurs combinaisons au procédé électrochimique pour traiter des effluents industriels". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0296.
Texto completoOlive mill technology generates a considerable amount of solid (olive pomace) and liquid (olive mill wastewater) by-products during olives milling season, usually between November and March. These wastes represent a great challenge for olive oil producers since they must find technical, environmental and economical solutions to manage these by-products. The main objective of this thesis was to explore and propose a complete cycle of olive mill wastes treatment. This is in the framework of a zero liquid and waste discharge approach and promotes the circular economy concept. Two sorbents based on olive pomace chemical activation, i.e., powdered activated carbon within composite alginate beads and granular activated carbon (GAC), were successfully synthetized. Both materials had a structure and a porous morphology that revealed their feasibilities as potential and low-cost bio-sorbents. They were employed in either adsorption or electrosorption for phenolic compounds (PCs) recovery from olive mill wastewater (OMWW). The adsorption of PCs fitted second-order kinetics (R2 = 0.997) and Langmuir isotherms (R2 = 0.995). The thermodynamic parameters for the PCs adsorption onto the bio-adsorbent suggested a spontaneous nature of adsorption, an endothermic reaction and a modification of bio-adsorbent surface during the adsorption process. Thomas's model was better at predicting PCs column adsorption (R2 =0.97). Finally, the investigation of bio-adsorbent regeneration showed that the recovery of phenols from OMWW could be carried out with ethanol (43% of PCs recovered) or hydrochloric acid (90% of PCs recovered). The results of electrochemical characterization of the two bio-adsorbent electrodes showed that the high electroactive surface area, the high value of exchange current intensity (I0) and the low value of charge transfer resistance (RCT) could be promising properties for electrosorption studies. Electrosorption improved the adsorption capacity of the composite beads from 123 to 170 mg g-1 and the removal rate of PCs from 66 to 74% for GAC. Furthermore, the electrosorption of organic compounds was shown for the first time with real wastewater. New models were developed to better understand and predict PCs electrosorption kinetics, including transient mass transport. The remaining organic compounds in OMWW were then eliminated (91 % of chemical oxygen demand (COD) removed) by advanced electro-oxidation treatment, while the bio-adsorbent was regenerated (34.5% of PCs recovered) by an electrochemical method
Sanchez, Colina Gustavo Antonio. "Physique et ingénierie des catastrophes naturelles : techniques accélérométriques et optiques pour le suivi de pénétration d'intrus solides dans des sols liquifiés". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAH020/document.
Texto completoThe subject of this thesis are the methods and experimental technics to help in the assessment of the underlying principles for the landslides, runaways and the other phenomena playing a main role in soil liquefaction and hence, on the falling or settling of buildings. This thesis conjugates geophysics’ to granular materials physics’ experiments, and it allowed to develop new measurement devices based on embedded microcontrollers
Serifou, Mamery y Mamery Serifou. "Béton à base de recyclats : influence du type de recyclats et rôle de la formulation". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00962148.
Texto completoSaeed, Mezida Bedru. "Nanoscale rearrangements in cortical actin filaments at lytic immunological synapses". Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/nanoscale-rearrangements-in-cortical-actin-filaments-at-lytic-immunological-synapses(8d00dd58-7b1a-435b-ad6c-016b12ff34d9).html.
Texto completoLambiotte, Renaud. "Inelastic gases: a paradigm for far-from-equilibrium systems". Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211103.
Texto completoCe travail consiste à étudier des systèmes constitués par un grand nombre de grains, auxquels de l’énergie cinétique est fournie, et à étudier leurs similarités et leurs différences avec des fluides traditionnels. Je me concentre principalement sur la nature de non-équilibre de ces fluides granulaires, en montrant que, même si les méthodes de méchanique statistique y sont applicables, leurs propriétés sont très différentes de celles de systèmes à l’équilibre ou proches de l’équilibre :
- Les fluides granulaires présentent des phénomènes de transport qui n’ont pas d’équivalent dans des fluides moléculaires, tels qu’un couplage spécifique entre flux de chaleur et gradient de densité.
- Leur distribution de vitesse est en général différente de la distribution de Maxwell-Boltzmann, et présente une surpopulation pour les grandes vitesses.
- Dans le cas de mélanges, différentes espèces de grains sont en général caractérisées par des énergies cinétiques différentes, i.e. ces systèmes sont sujet à une non-equipartition de leur énergie.
- Ces fluides ont tendance à former des inhomogénéités spatiales spontanément. Cette propriété est illustrée en étudiant l’expérience du Demon de Maxwell appliquée aux systèmes granulaires.
Chacune de ces particularités est discutée en détail dans des chapitres distincts, où l’on applique différentes méthodes de méchanique statistique (équation de Boltzmann, transition de phase, mean field models…) et où l’on vérifie les prédictions théoriques par simulations numériques (MD, Monte Carlo…).
Doctorat en sciences, Spécialisation physique
info:eu-repo/semantics/nonPublished