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Artykuły w czasopismach na temat "Cendres de balle de riz":
Ka, Aminata, Momar Talla Gueye, Serigne Mbacké Diop, Papa Seyni Cissokho i Absa Ndiaye Gueye. "Etude de l’efficacité de la poudre et des cendres de balle de riz contre deux insectes ravageurs du riz stocké au Sénégal, Sitophilus zeamais (Motsch.) et Tribolium castaneum (Herbst)". International Journal of Biological and Chemical Sciences 12, nr 4 (13.12.2018): 1731. http://dx.doi.org/10.4314/ijbcs.v12i4.17.
RAMANANDRAIBE, Tanteliniaina Mbolanirina, Pierre RAKOTOMAMONJY, Guy Joël ROBISONARISON i Edouard Ravalison ANDRIANARISON. "Amélioration Des Qualités Mécaniques D’une Brique De Terre Comprimée Stabilisée Au Ciment Par Trempe De Consolidation Au Silicate De Soude". International Journal of Progressive Sciences and Technologies 38, nr 1 (30.04.2023): 388. http://dx.doi.org/10.52155/ijpsat.v38.1.5195.
Wafar, R. J., L. I. Tarimbuka, T. Sini, Z. A. Adi, E. B. Lamalang i M. I. Bako. "Growth performance and nutrient digestibility of weaner pigs fed cereal offals in diets". Nigerian Journal of Animal Production 47, nr 6 (28.02.2021): 129–34. http://dx.doi.org/10.51791/njap.v47i6.2918.
"Effets Des Amendements Organiques (Balle De Riz, Sciure De Bois, De Bouse Des Vaches) Sur La Production Du Maïs Cultivé Dans Le Site Universitaire « Lwama »". Journal of Environmental Science, Computer Science and Engineering & Technology 10, nr 3 (8.08.2021). http://dx.doi.org/10.24214/jecet.a.10.3.35257.
Rozprawy doktorskie na temat "Cendres de balle de riz":
Almirón, Baca Jonathan Joseph. "Etude des propriétés thermo mécaniques des matériaux polymères avec addition du résidu solide de pyrolyses". Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR039.
The final disposal of vehicles at their end-of-life is generating a world environmental problem. Nowadays, in Europe there are companies dedicated to the disassembly and recovery of the components that can be reused, being plastic wastes among these components. Thus, in the first part of this research, it was proposed to treat these plastic wastes through a pyrolytic process in order to transform them into solid wastes, to be used as part of the additives in a flame retardant system for a polypropylene matrix. Vehicle residues were segregated according to their densities and characterized. They were subsequently incorporated into a thermal pyrolysis process giving, as a result, a solid pyrolytic residue (RSP). Using the RSP, the polymer blends were prepared composed of polypropylene, ammonium polyphosphate and pentaerythritol. Their thermal, mechanical and flammability properties were evaluated by thermogravimetric analysis, modulus of elasticity, tensile strength, percentage of deformation and the limiting oxygen index.In the second part of this research, it was determined and compared whether the heat treated solid waste from the pyrolysis of plastic waste of vehicles (RS-T), volcanic ash (CV) and rice husk ash (CR) have any synergistic action when added to polypropylene flame retardant additives (such as ammonium polyphosphate and pentaerythritol). These materials were characterized by nitrogen adsorption analysis (Brunauer-Emmett-Teller method), X-ray fluorescence and X-ray diffraction. The abundant presence of SiO2 and Al2O3 was determined, which are considered flame-retardant minerals. Polymer matrix composites were synthetized, which were composed of polypropylene, ammonium polyphosphate, pentaerythritol and CV, CR and RS-T materials (at 1% to 9% by wt.). The thermal stability and fire resistance of the synthesized polymer mixtures were evaluated through the limiting oxygen index, thermogravimetric analysis and cone calorimetry. It was determined that these materials have a synergistic action with flame-retardant additives as an increase in their fire resistance has been demonstrated.In the final part of this research, the influence of natural zeolites obtained from ashes of the Ubinas volcano, as synergistic agents in a flame-retardant system, has been studied. Four different zeolites were synthesized from volcanic ash, including calcined and not calcined ashes, being placed in an alkaline solution at three synthesis temperatures. Zeolites were characterized by X-ray diffraction, nitrogen adsorption analysis (Brunauer-Emmett-Teller method) and scanning electron microscopy. Polypropylene polymer blends were prepared with ammonium polyphosphate, pentaerythritol and the zeolites at 1, 5 and 9% (by wt.). Their thermal stability and fire resistance were evaluated by thermogravimetric analysis, limiting oxygen index, ULV-94 vertical flammability test and cone calorimetry. Their morphological structure was tested by scanning electron microscopy. It was determined that the synthesis temperature and the use of calcined and non-calcined volcanic ashes has an influence on the characteristics of zeolites and on their synergistic action with flame retardants and therefore, on their flame-retardant properties
Wilson, William. "Bétons durables à base de cendres d'écorces de riz". Mémoire, Université de Sherbrooke, 2012. http://hdl.handle.net/11143/6218.
Tran, Thi Phuong Thao. "Développement de biocomposites à base de Poly(Acide Lactique) et de balles céréalières : vieillissement des biocomposites et traitement de surface des balles". Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20203/document.
The cereal husks, namely the envelope around the grain, have recently attracted the attention of scientists for biocomposites development, because they are low-cost, renewable, biodegradable, and available in abundant volume throughout the world. Their chemical composition and their thermal and mechanical properties are similar to the natural fibers.In this work, two types of rice husk and two types of Einkorn wheat husk were studied through their microstructure, chemical composition, mechanical and thermal properties. The husks have been incorporated into a bio-sourced and biodegradable matrix, namely poly (lactic acid) (PLA) to produce biocomposite which functional properties were studied. It appears that the husks can be good candidates for strengthening the PLA through improved adhesion at the interface between the husks and the PLA.To improve the husks/PLA interface, the husks were treated with an alkaline solution (NaOH) and organosilane coupling agents, such as 3-aminopropyltriethoxysilane and 3 - glycidoxypropyltrimethoxysilane. The alkaline treatment has removed much of hemicelluloses, lignin, wax and silica present in the husks. The dissolution of these components resulted in a higher hygroscopicity of husks and lower mechanical properties of biocomposites. The coupling between an alkaline treatment and a silane treatment seems to provide better properties than the silane treatment alone. This surface treatment has a greater impact on the Einkorn wheat husks than on rice husksThe variations of the functional properties of rice husks based biocomposites during different ageings (thermal ageing, hydro-thermal ageing, hygro-thermal cycled ageing, UV ageing) was studied. The results show that the microstructural changes induced by ageing significantly influence the properties of biocomposites. Biocomposites degradation results in a decrease of the average molecular weight of PLA. The reorganization of these macromolecules significantly increases the degree of crystallinity of the material. This causes a change in color, dimensional stability of devices and mechanical properties of PLA and biocomposites which essentially depends on the ageing temperature regards to the glass transition temperature of PLA. It appears that the addition of husks accelerates the degradation of PLA. In the case of a hydro-thermal ageing performed above the glass transition temperature of the PLA, a reduction of this degradation was demonstrated by the use of specific surface treatments of husks
Chabannes, Morgan. "Formulation et étude des propriétés mécaniques d'agrobétons légers isolants à base de balles de riz et de chènevotte pour l'éco-construction". Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS008/document.
The improvement of building energy efficiency and the reduction of CO2 emissions from the construction industry have become a major issue over the last years. We need to cut the energy consumption linked to heating and cooling of buildings during their operating period but also to choose materials with low carbon footprint using renewable and local resources.Hemp concretes are more and more used in green construction. These bio-based building materials consist of hemp-derived aggregates mixed with mineral binders and water. These concretes have attractive insulating properties and present some effectiveness in buffering variations of temperature and humidity in buildings. Considered as a multifunctional material, hemp concrete can offer an eco-friendly alternative to traditional building envelopes but have the disadvantage of being very low strength. Unlike cellular concrete or clay bricks, hemp concretes cannot be used as load-bearing materials but for infilling walls with a wood timber frame. The aim of this thesis work is, on the one hand, to diversify plant aggregates used for the manufacturing of bio-based concretes by developing an innovative material based on local rice husk from the Camargue area and on the other hand to investigate some processes in order to increase mechanical strength of these materials after the first months of curing. The first objective of this work was to characterize rice husks prior to incorporating them in a lime-based mix. Intrinsic features of rice husks led to the manufacturing of a new bio-based concrete designed with a lower water content and a higher apparent density than hemp concrete (by remaining below 800 kg.m-3). Thermal conductivity of rice husk concrete was comparable to that of hemp concrete for a given « binder on aggregates (B/A) » mass ratio. Nevertheless, mechanical performances in compression have proved lower for the rice husk concrete after one month of hardening at 20°C and 50%RH. The second line of the work dealt with the evolution of mechanical properties and binder hardening over time. Specimens were cured during 10 months either at 20°C and 50%RH or exposed outdoors. Hemp concrete exhibited a higher compressive strength gain over time than that achieved for rice husk concrete despite a same hardening kinetics. This curing under natural carbonation was compared to an accelerated one (CO2 curing). Accelerated carbonation provided the opportunity to obtain the same compressive after 2 months than that reached after the outdoor exposure during 10 months. Considering that compressive strength of rice husk concrete is restricted by the bonding strength between the binder and the aggregates, this work also focused on the effect of a lime-water treatment of plant aggregates. This latter was not efficient for hemp concrete but increased compressive strength of rice husk concrete. Finally, the effect of a moist curing (95%RH) and elevated temperature (50°C) on binder hardening and strength development of bio-based concretes was investigated. This aspect was also studied on lime-based mortars. The results showed that this type of curing led to a strong increase of mechanical strength for the binder after 28 days due to kinetic effects on hydration reactions. Nevertheless, these curing conditions were detrimental to the transition zone between the binder and the plant aggregates and consequently counterproductive for the mechanical performances of bio-based concretes
Chabi, Edem. "Étude de la formulation et des propriétés mécaniques et thermiques du béton de balles de riz". Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0232/document.
Everyone agrees today that human activities significantly affect the climate of the planet. The construction sector is one of the main contributors to this situation as it is the largest energy consumer and the second largest CO2 emitter in the world. It is therefore important to build eco-friendly buildings, which consume little energy and emit less greenhouse gases throughout their life cycle. The present study is then integrated into a general problem of development of innovative building materials with reduced environmental impact. We propose to use the rice husk as a vegetable aggregate in a cementitious matrix. The objective of the work is to propose a method for the mix design of concretes based on plant aggregates and to study the mechanical and thermal behavior of rice husk concrete. Setting tests on pure cement paste formulated with water resulting from the infusion of the rice husk showed that these aggregates had no inhibiting effect on the setting of the cement. To confirm this hypothesis, a chemical analysis of the rice husk was carried out and the results showed that the extractable ratio of rice husks is almost zero, unlike other plant aggregates such as hemp and wood. The proposed formulation method consists in determining the packing density of the plant skeleton for a given method of implementation and then in proportioning the binder paste which will occupy the residual intergranular pore volume. The paste is consisted of the binder, the effective water, the possible additions and admixture, and trapped air and/or entrained air. For a given volume of air (and additions), the quantities of cement and effective water are then adjusted to achieve the targeted performances, based on the law of Féret. However, for this type of concrete, the large volume of entrained air also depends on the quantity of cement and water present in the mixture, the intensity of the mixing and the casting mode. A model describing the volume of residual air was then calibrated from tests carried out with the components of the concrete that it is desired to manufacture. Finally, the problem of formulation is solved by using a numerical optimization module. In order to validate the model, the method for the mix design was applied to five samples with a target resistance of 0.5; 1; 2; 4 and 8 MPa. The performances obtained are quite similar to those targeted. In addition, it has been observed that the preservation mode of the specimens has a significant influence on the mechanical strength of the material. Indeed, a cure in desiccation condition can reduce the mechanical resistances up to 60%. The best resistances obtained were observed on the specimens preserved at 95 % RH. Measurements of thermal conductivity have shown that rice husk concrete is a very good alternative to more conventional systems in terms of thermal insulation. The average value of the thermal conductivity of the rice husk concrete varies depending on the binder dosage between 0.070 W/(m.K) and 0.171 W/(m.K). The evolution of the thermal conductivity as a function of the density and the cement dosage is linear
Neya, Béli. "Valorisation de la biomasse du Burkina faso : faisabilité de panneaux de particules à base de déchets agricoles et recherche de nouveaux biocides pour la préservation du bois à partir d'essences naturellement durables". Nancy 1, 2002. http://docnum.univ-lorraine.fr/public/SCD_T_2002_0253_NEYA.pdf.
The first part of work concerns the manufacture of particle boards with sugarcane bagasse or rice husk using various resins among which Melamine-Urea-formaldehyde resins (MUF), Phenol-Formaldehyde resins (PF), polyisocyanates resins (PMDI) and finally of mixtures of PMDI/PF resins. The results obtained show that utilization of PMDI resins gives the best results (good mechanical properties and good water resistance), while PF resins lead to slightly lower results. Mixtures PMDI/PF don't give the awaited results, particle boards obtained having properties similars to those obtained with PF resins. MUF resins lead to the less satisfactory results. The second part of the work, concerns the study of reasons of the natural durability of Burkea africana, Prosopis africana and Pterocarpus erinaceus woods in order to identify new biocides for wood preservation. The separation of the extracts matters contained in the different woods and the study of their fungicidal properties indicates the biocidal properties of some of the compounds contained in the extracts. The study of wood durability undergone with or without preliminary extractions shows that the presence of biocidal compounds in the extracts does not allow to explain the resistance of studied wood to fungi and termites attack. The hydrophobic character of wood as its strong dimensional stability would be also a significant factor of its resistance. The analysis of the products in the etheral extracts indicates the presence of greases, waxes and squalene which can be at the base of the preceding results
Silva, Vela Alejandro Oscar. "Estudio del comportamiento mecanico de compuestos de mezcla polimerica con adicion de cáscara de arroz y compatibilizante". Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10116/document.
The use and development of reinforced polymers are long-standing activities and many studies have already been done on the subject. With the development of the use of plasticsthe question of recycling becomes more and more acute. The work presented here reflects these concerns by seeking to understand the role of a reinforcement consisting of rice husk on the mechanical behavior of a mixture of polyolefins. The experimental design which was used was built on the base 1) of polyolefin blends 2) the addition of rice wheat and 3) the addition of compatibilizer and 4) the mode of preparation by injection or compression. The adhesion of rice husk with the polymer matrix has been examined in relation to its microstructure and composition. It was also revealed that the addition of rice wheat alone reduces the tensile properties but that the addition of compatibilizer promotes the deformation of the polymer blend. A noticeable difference was found between tensile properties of specimens prepared by injection or compression. However, the results can be validly compared if we introduce a parameter called "load capacity" that we propose as the ratio between the maximum voltage and maximum strain which provides information on the overall ability of strength and deformation conditions at fracture. From the standpoint of physical-chemical process it can be concluded that the addition of compatibilizer improves the adhesion between the polymer components and rice wheat and consequently the fracture surface. The index of "load capacity" that we propose could be considered a relevant design factor
El uso y desarrollo de plásticos reforzados son actividades sobre las cuales se han publicado muchos estudios y con ello, la cuestión del reciclaje se vuelve cada vez un tema mas critico. El trabajo aquí presentado refleja esta preocupacion al tratar deentender el papel de la cáscara de arroz como elemento reforzante en el comportamiento mecánico de una mezcla de poliolefinas. El diseño experimental que se utilizó fue construido en la base 1) de mezclas de poliolefinas con reciclado depolietileno de baja densidad 30%, 40% de polietileno de alta densidad y polipropileno 30% correspondiente a la composición de los plásticos reciclados en Arequipa, Perú, 2) la adición de cáscara de arroz y 3) la adición de compatibilizante y 4) el modo depreparación, por inyección o compresión. Los resultados confirman que la cáscara de arroz es térmicamente estable hasta 250 º C. Su adhesión con la matriz polimérica se ha examinado en relación con su microestructura y composición. También se reveló que la adición de cáscara de arroz solo reduce las propiedades de tracción, pero que la adición de compatibilizante promueve la deformación de la mezcla del polímero. Una notable diferencia se encontró entre las propiedades de tracción de las muestras preparadas por inyección o compresión. Sin embargo, los resultados pueden ser validados por comparación si se introduce un parámetro llamado "capacidad de carga" que se propone como la relación entre la resistencia máxima y la deformación máxima hasta la ruptura que puede soportar. Desde el punto de vista del proceso físico-químico, se puede concluir que la adición de compatibilizante mejora la adhesión entre los componentes de polímero y la cáscara de arroz y por ende la calidad de la superficie de fractura. Los compuestos preparados puede ser una alternativa para la recuperación de residuos plásticos y agrícolas. El índice de "capacidad de carga" que proponemos podría ser considerado un factor de diseño pertinente para este tipo de materiales
Adamon, Gildas David Farid. "Modélisation de la cinétique de gazéification étagée de la biomasse tropicale : cas des balles de riz et des rafles de maïs". Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2354/document.
The gasification tests in this study were carried out using an instrumented installation equipped with a fixed bed reactor using carbon dioxide and water steam, as reagents. In this study, we considered the stepped gasification process. In addition, the ten-year resource availability study allowed us to select two agricultural residues, taking into account their availability over time, the absence of nutritional conflict and their physicochemical characteristics… At the end of this study, two agricultural residues were selected: rice husks and corn cobs. The pyrolysis of these two biomasses was carried out in a muffle furnace at a temperature of 450 °C for a residence time of 45 minutes. A mathematical model based on the Newton method has been proposed to estimate the coke yield of rice husk and corn cobs as a function of temperature, for a fixed residence time. We also carried out a physicochemical characterization of these two agricultural residues as well as their pyrolysis cokes. Several pyrolysis tests have also been carried out in ATG in order to determine the real order of the decomposition reactions by pyrolysis, of these two biomasses, as a function of temperature. For the gasification tests, they were carried out on the pyrolysis coke of the two retained biomasses, using an installation equipped with a fixed-bed reactor on the one hand, and by thermogravimetric analysis of another hand. Several kinetic models (VRM, SCM and RPM) were used to model the gasification reaction kinetics of rice husk and corn cobs with carbon dioxide and water steam. It appears that the RPM model is the most suitable of the three models studied to best simulate the gasification reaction of char from rice husk and corn cobs under the operating conditions studied in this study. Thus, the activation energies obtained are respectively 165.8 kJ/mol and 152.9 kJ/mol with carbon dioxide and water steam for rice husk while the exponential factor varies from 2595.4 s-1 to 3473.4 s-1 with respective values of the structural parameter Ψ = 3.8 for the Boudouard reaction and Ψ = 2.16 for the water steam gasification. However, the activation energies obtained for corn cobs are 114.4 kJ/mol and 105.5kJ/mol respectively with carbon dioxide and water steam while the exponential factor varies from 13.9 s-1 to 18.3 s-1 with respective values of the structural parameter Ψ = 12.3 for the Boudouard reaction and Ψ = 8.68 for the water steam gasification
Doumongue, Mba Beaugrain. "Approche expérimentale et numérique pour l'efficacité énergétique et le confort des bâtiments à matériaux biosourcés au Togo". Electronic Thesis or Diss., La Rochelle, 2022. http://www.theses.fr/2022LAROS049.
The global issues, related to climate change have led to the rise in power worldwide, work related to sustainable building, to raise the capacity of the sector, essential consumer of energy, to reduce greenhouse gases. Our work is one of those, because it contributes through several components, to improve the energy performance of buildings with bio-based materials. Indeed, our work addresses at the same time, a series of characterizations of physical, thermal and hydric order, aiming at improving the knowledge on the rice husks and the concrete of rice husks; multi-scale experiments (microscopic, wall element, scale model, scale 1) and numerical simulations driven by the TRNSYS tool, the realization of a structural and economic comparison of cells with different materials, the explicitation of the economic gains related to the use of rice husk concrete refined on the case of a high-rise building, the analysis of the life cycle of a scale cell and the realization of a study of the socio-economic impact of the high-rise building mentioned above. In the framework of these works, partly carried out in Lomé and partly in La Rochelle, we carried out, as characterizations, an exploration of the microscopic environment of rice husks and rice husk concrete with the help of the scanning electron microscope, followed by the determination of thermal conductivity, specific heat, sorption isotherms and water vapor permeability. Based on these results, which are essential for the analysis of the behavior of the studied materials, we set up a bizone experiment aiming to stress a wall element separating two conditioned environments to stimulate heat transfer; then we moved on to scale models comparing 5 cells with various envelopes, including bulk rice husks and rice husk concrete, identically exposed to external climatic conditions. From there, a human-scale cell was put into experimentation with monitoring of temperature and humidity parameters. This experimental phase was validated by a numerical model built on TRNSYS. To this we associated an economic analysis in connection with the structural benefits related to the lightness of the biosourced material, aiming at determining the percentage of the economic gains which are added to the benefits in terms of comfort. This being the case, and in the interest of following the economic logic, an environmental point of view was undertaken with an LCA on Elodie on a fictitious cell model located in La Rochelle, which was extended with a social impact study, in order to mobilize in our work all the votes of sustainable development