Letteratura scientifica selezionata sul tema "Matière organique particulaire – Composition chimique"
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Articoli di riviste sul tema "Matière organique particulaire – Composition chimique":
Corniaux, Christian, N. Durand, Jean-Michel Sarrailh e Hubert Guérin. "Composition chimique et dégradabilité enzymatique et in vitro d'espèces ligneuses arbustives utilisables par les ruminants dans les parcours extensifs de la Nouvelle Calédonie. I. Typologie". Revue d’élevage et de médecine vétérinaire des pays tropicaux 49, n. 1 (1 gennaio 1996): 60–67. http://dx.doi.org/10.19182/remvt.9549.
Corniaux, Christian, Hubert Guérin e H. Steingass. "Composition chimique et dégradabilité enzymatique et in vitro d'espèces ligneuses arbustives utilisables par les ruminants dans les parcours extensifs de la Nouvelle-Calédonie. II. Equation de prédiction de la dégradabilité enzymatique et in vitro de la m". Revue d’élevage et de médecine vétérinaire des pays tropicaux 49, n. 2 (1 febbraio 1996): 158–66. http://dx.doi.org/10.19182/remvt.9534.
CLINQUART, A., C. BRUNDSEAUX, I. DUFRASNE, L. ISTASSE e D. MICOL. "Utilisation des matières grasses chez les bovins à l’engraissement". INRAE Productions Animales 8, n. 1 (21 febbraio 1995): 29–42. http://dx.doi.org/10.20870/productions-animales.1995.8.1.4102.
Gilliot, Jean-Marc, Emmanuelle Vaudour, Joël Michelin e Sabine Houot. "Estimation des teneurs en carbone organique des sols agricoles par télédétection par drone". Revue Française de Photogrammétrie et de Télédétection, n. 213 (26 aprile 2017): 105–15. http://dx.doi.org/10.52638/rfpt.2017.193.
Horeau, V., S. Richard, R. Vigouroux, L. Guillemet e P. Cerdan. "Variabilités spatiales et temporelles de la qualité physico-chimique et des invertébrés pélagiques des eaux de la retenue hydroélectrique de Petit Saut (Guyane française)." Revue des sciences de l'eau 18 (12 aprile 2005): 109–26. http://dx.doi.org/10.7202/705579ar.
Abdulazeez, A., O. R. Madibela e C. M. Tsopito. "Effect of substituting maize grain with cobs treated with combinations of urea and wood ash on chemical composition and in sacco degradability". Nigerian Journal of Animal Production 48, n. 5 (10 novembre 2021): 239–44. http://dx.doi.org/10.51791/njap.v48i5.3207.
Adebajo, B. J. "Chemical composition and In Vitro Digestibility of five selected forages used for production and management of small ruminants in Odoragushin of Epe Local Government Area, Lagos State." Nigerian Journal of Animal Production 50, n. 3 (14 maggio 2024): 19–23. http://dx.doi.org/10.51791/njap.v50i3.4021.
Kamoun, M., e A. Thewis. "Influence du mode de conditionnement d'un fourrage vert sur sa composition chimique, la digestibilité in vitro de la matière organique et la dégradabilité in sacco de l'azote dans le rumen". Reproduction Nutrition Développement 30, Suppl. 2 (1990): 159s—160s. http://dx.doi.org/10.1051/rnd:19900806.
Adebayo, B. J., A. A. Nwani e A. N. Mafimidiwo. "Evaluation of nutritive value and in vitro digestibility of five selected browse plants as feed for ruminants in Nigeria". Nigerian Journal of Animal Production 50, n. 3 (14 maggio 2024): 98–108. http://dx.doi.org/10.51791/njap.v50i3.4032.
AUFRÈRE, J., R. BAUMONT, L. DELABY, J. R. PECCATTE, J. ANDRIEU, J. P. ANDRIEU e J. P. DULPHY. "Prévision de la digestibilité des fourrages par la méthode pepsine-cellulase. Le point sur les équations proposées". INRAE Productions Animales 20, n. 2 (7 giugno 2007): 129–36. http://dx.doi.org/10.20870/productions-animales.2007.20.2.3445.
Tesi sul tema "Matière organique particulaire – Composition chimique":
Liénart, Camilla. "La matière organique particulaire dans les systèmes côtiers : composition, dynamique et forçages à l'échelle multi-systémique". Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0255/document.
Pelagic coastal systems are characterized by multiple inputs of particulate organic matter (POM) from autochthonous (phytoplankton) and allochthonous (continental, benthic) origin whose spatial and temporal variability can be high. The aims of my PhD were to 1) quantify POM composition in pelagic coastal systems, 2) determine the forcings to its spatio-temporal dynamics and 3) investigate the link between bacteria and POM composition. This study was conducted on twelve systems (estuary, lagoon, bays, rias, littoral) distributed over the three maritime facades of France by combining the use of elemental and isotopic ratios (composition), fatty acids (POM-bacteria link) and multivariate analysis (forcings).At multi-systems and/or intra-system scale, two main gradients are observed:- an inshore (higher continental and benthic contribution) - offshore gradient (phytoplanktonic POM) mainly related to hydrodynamics and sedimentary hydrodynamics (river flow, resuspension of benthic material) and to the proximity to allochthonous sources- a South (POM related to diazotrophy) – North (absence of this POM) gradient, associated to the trophic status (oligo vs meso/eutrophy) of the studied systems.The seasonality of spatio-temporal dynamics of POM composition is highly variable depending on the station. It is in general higher near the coast and lower offshore and upstream in the studied estuary. This dynamic is also strongly associated to sedimentary hydrodynamics.Finally, this study highlight that bacterial biomass is mainly associated to continental and benthic POM
Rivellini, Laura-Hélèna. "Propriétés physico-chimiques, optiques et identification des sources des aérosols en Afrique de l’Ouest". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10177/document.
The aim of this thesis consists in studying the chemical nature, the origins as well as the optical properties of aerosols in West Africa. We focused on establishing the links between the chemical composition of fine particles at surface and aerosols optical properties. Our study is based on measurements acquired during the SHADOW field campaign, implemented on the M’Bour (Senegal) site during two intensive observation periods: March to June 2015 (IOP-1) and November 2015 to January 2016 (IOP-2). For this purpose, an instrumentation allowing online chemical characterization of surface PM1 (ACSM, TEOM-FDMS, aethalometer), at high time resolution, was implemented in parallel with instruments measuring aerosols optical properties at surface (aethalometer, nephelometer) and along the atmospheric column by remote sensing (Lidar, photometer). The coupling of meteorological data with statistical tools allowed determining the local and/or regional contribution of the different species, and identifying the source areas responsible for the high concentrations observed on site. The source receptor model (PM) allowed to further investigate the submicronic organic fraction, highlighting a fast photochemistry and the influence of specific anthropogenic activities (waste burning, fish smoking). We were also able to characterize, per season, the type of aerosols contributing to the fine particle extinction measured at surface, as well as to show links/differences between remote sensing and surface chemical/optical properties of fines particles during the two IOP
Siepka, Damian. "Development of multidimensional spectral data processing procedures for analysis of composition and mixing state of aerosol particles by Raman and FTIR spectroscopy". Electronic Thesis or Diss., Lille 1, 2017. http://www.theses.fr/2017LIL10188.
Sufficiently adjusted, multivariate data processing methods and procedures can significantly improve the process for obtaining knowledge of a sample composition. Spectroscopic techniques have capabilities for fast analysis of various samples and were developed for research and industrial purposes. It creates a great possibility for advanced molecular analysis of complex samples, such as atmospheric aerosols. Airborne particles affect air quality, human health, ecosystem condition and play an important role in the Earth’s climate system. The purpose of this thesis is twofold. On an analytical level, the functional algorithm for evaluation of quantitative composition of atmospheric particles from measurements of individual particles by Raman microspectrocopy (RMS) was established. On a constructive level, the readily accessible analytical system for Raman and FTIR data processing was developed. A potential of a single particle analysis by RMS has been exploited by an application of the designed analytical algorithm based on a combination between a multicurve resolution and a multivariate data treatment for an efficient description of chemical mixing of aerosol particles. The algorithm was applied to the particles collected in a copper mine in Bolivia and provides a new way of a sample description. The new user-friendly software, which includes pre-treatment algorithms and several easy-to access, common multivariate data treatments, is equipped with a graphical interface. The created software was applied to some challenging aspects of a pattern recognition in the scope of Raman and FTIR spectroscopy for coal mine particles, biogenic particles and organic pigments
Daoudi, Mouad. "Développement de diagnostics optiques et chimiques pour caractériser et contrôler les émissions particulaires et gazeuses des systèmes de combustion". Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR062.
Combustion is one of the main contributors to both particulate matter (PM) and several gaseous pollutants which may have harmful effects on human health, environment, and climate. The main goal of this PhD is to develop a measurement procedure based on optical extinction to monitor PM and/or some gaseous pollutants emissions produced by a combustion system (e.g., internal combustion engine, turbine or industrial burner). This work also aims to shed the light on the relationship between the chemical composition and the optical extinction coefficient measured for these emissions. To succeed in this measurement challenge and avoid the complexity of a real powertrain setup, a modular combustion bench has been built in which gaseous pollutants and PM can be monitored independently. This experimental setup was equipped with a version of the miniCAST soot generator that has the ability to burn liquid fuels, thus allowing the study of the impact of the chemical composition of the fuel on the physico-chemical properties of PM. A total of 34 operating points were characterized, spanning a wide range of flame overall equivalence ratio (i.e., 0.104 - 1.673) using two different fuels (diesel B7 and dodecane). The soot particles produced by this burner were characterized in terms of morphological key parameters, size distributions, mass concentrations, and optical extinction coefficients. All these data were then used to evaluate and intercompare the soot volume fraction using three different methods: granulometric (combining size measurement and morphology), mass, and optical.Furthermore, the chemical composition of the combustion products of the miniCAST was studied in order to characterize the organic content of the gas-phase and the particulate-phase. This study was carried out by combining gas chromatography (GC), to examine low mass polycyclic aromatic hydrocarbons (PAHs) in the gas-phase, and time-of-flight secondary ion mass spectrometry (ToF-SIMS), to characterize the heavy PAHs in both the gas- and particle-phases. These experiments allowed to identified the operating points associated with the highest content of organic compounds. Then, a correlation was observed between the presence of that organic content (mostly attributed to organic PAHs) and the optical extinction coefficient. The use of an oxidation catalyst (catalytic stripper) on the burner exhaust gases allowed to evaluate the impact of this thermal treatment at 350 °C on the chemical composition of the exhaust gases, on the size and morphology characteristics of soot aggregates, and consequently on the measurement of the optical extinction coefficient. Finally, the measurement of the optical extinction coefficient for PM and gaseous pollutants such as NO, NO2 and/or NH3 injected first separately and then simultaneously was performed to evaluate the interference of gaseous pollutants with PM and to propose a procedure allowing their simultaneous control.In conclusion, this thesis provides for a soot generator's PM emissions a detailed description of soot particles sizes, morphologies, soot volume fractions and optical extinction coefficient, as well as a detailed characterization of the chemical composition of the gas- and particulate-phase produced by this generator, under different operating conditions. Thanks to the experimental database obtained, this thesis proposes a methodology of measurement and analysis for optical extinction coefficients and for ToF-SIMS mass spectra which can be transposed to the study of bio-fuels or synthetic fuels (e-fuels) in the near future
Siepka, Damian. "Development of multidimensional spectral data processing procedures for analysis of composition and mixing state of aerosol particles by Raman and FTIR spectroscopy". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10188/document.
Sufficiently adjusted, multivariate data processing methods and procedures can significantly improve the process for obtaining knowledge of a sample composition. Spectroscopic techniques have capabilities for fast analysis of various samples and were developed for research and industrial purposes. It creates a great possibility for advanced molecular analysis of complex samples, such as atmospheric aerosols. Airborne particles affect air quality, human health, ecosystem condition and play an important role in the Earth’s climate system. The purpose of this thesis is twofold. On an analytical level, the functional algorithm for evaluation of quantitative composition of atmospheric particles from measurements of individual particles by Raman microspectrocopy (RMS) was established. On a constructive level, the readily accessible analytical system for Raman and FTIR data processing was developed. A potential of a single particle analysis by RMS has been exploited by an application of the designed analytical algorithm based on a combination between a multicurve resolution and a multivariate data treatment for an efficient description of chemical mixing of aerosol particles. The algorithm was applied to the particles collected in a copper mine in Bolivia and provides a new way of a sample description. The new user-friendly software, which includes pre-treatment algorithms and several easy-to access, common multivariate data treatments, is equipped with a graphical interface. The created software was applied to some challenging aspects of a pattern recognition in the scope of Raman and FTIR spectroscopy for coal mine particles, biogenic particles and organic pigments
Bigot, Marianne. "Biogeochimie de la matiere organique dans l'estuaire du huang he et en mer de bohai". Paris 6, 1988. http://www.theses.fr/1988PA066083.
Dubois, Anne-Sophie. "Composition et transfert trophique de la matière organique particulaire dans le Bassin d’Arcachon". Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14515/document.
Abstract
Gobé, Valérie. "Matière organique complexe du sol ; structure et rôle dans les processus d'humification du carbone xénobiotique". Poitiers, 1998. http://www.theses.fr/1998POIT2316.
Marrocchi, Yves. "Incorporation des gaz rares dans la matière organique primitive du système solaire". Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2005. http://tel.archives-ouvertes.fr/tel-00258016.
Le, Meur Mathieu. "Matières en suspension de la Moselle (Lorraine, France) : caractérisation minérale et organique et réactivité vis-à-vis des contaminants métalliques". Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0161/document.
Suspended Particulate Matter (SPM) in rivers, are constituted of colloidal and particulate matter, and described as heterogeneous aggregates of mineral, organic and biological phases which display high and reactive surface area. This study aimed to investigate the spatial and temporal composition evolution (Mineral and organic) of SPM along the Moselle River (Lorraine, France). SPM were collected at different stations along the river and at different regime flow. Macroscopic and microscopic studies were performed in order to characterize natural SPM. The second objective was to investigate the reactivity of SPM toward metallic contaminants. The results showed that the grain size distribution, elemental composition and mineralogy of SPM along the Moselle River and during different regime flow showed only slight variations, except for the Fensch and Orne tributaries, two rivers that were impacted by inherited steel making industrialization and different land use. The results also revealed that the catchment geology greatly contributed to the SPM composition in the river and highlighted the fact that SPM play a high contribution in TMEs and REEs transportation. The SPM organic matter characterization also showed slight variations through the catchment revealing the diffuse pollution in a catchment of this size. Seasonal variations were observed with strong autochthonous production during low flow level in summer. Regime flow increase resulted in the decrease of TOC content and in the presence of more degraded OM. Except for Fensch and Orne stations, surface properties of SPM are similar in relation with SPM composition. This study also showed that Zn association mode differed with different Zn concentrations. The comparison between Zn association mode on lab controlled particles and natural SPM revealed the contribution of phyllosilicates in zinc transport
Libri sul tema "Matière organique particulaire – Composition chimique":
Ontario. Esquisse de cours 12e année: Sciences de l'activité physique pse4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: Technologie de l'information en affaires btx4e cours préemploi. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: Études informatiques ics4m cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: Mathématiques de la technologie au collège mct4c cours précollégial. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: Sciences snc4m cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: English eae4e cours préemploi. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: Le Canada et le monde: une analyse géographique cgw4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: Environnement et gestion des ressources cgr4e cours préemploi. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: Histoire de l'Occident et du monde chy4c cours précollégial. Vanier, Ont: CFORP, 2002.
Ontario. Esquisse de cours 12e année: Géographie mondiale: le milieu humain cgu4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.