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Cementitious Composites Containing Multifunctional Sugarcane Fibres

Journal of Building Material Science 2019年第2期1卷 1-8页

作者： Viviane VSGuilarduci Patricia Benedini Martelli Honória de Fátima Gorgulho pablo resende oliveira Tulio Hallak Panzera Núcleo de Ambiente Saúde e SegurançaIF Sudeste MGSão João del-ReiBrazil Department of Natural Sciences–DCNAT Federal University of São João Del-Rei-UFSJBrazil Centre for Innovation and Technology in Composite Materials–CITeC Department of Mechanical EngineeringFederal University of São João Del-Rei-UFSJBrazil

This work investigates the reuse of natural(SCB)and minopropyltriethoxysilanemodifed(MSCB)sugarcane bagasse fbres in cementitious *** bagasse fbres are pre-used in the treatment of motor oil contaminated effluents.A full factorial design is used to identify the effects of fbre type(SCB and MSCB),fbre length(0.6 and 1.2 mm),fbre amount(1 and 2 wt%)and fbre condition(before and after oil filtration)on apparent density,water absorption,apparent porosity,ultra-pulse velocity,dynamic modulus,flexural strength and *** fibres lead to increased apparent density compared to MSCB fibre reinforced *** fibres contribute to reduce composite porosity,leading to higher mechanical *** smaller area of MSCB fibres promotes a larger amount of cementitious phase per unit volume,thus increasing the strength of the *** sugarcane fbres(1.2 mm)have a larger surface area,leading to a higher fibre concentration per unit volume,which increases water *** amount of fibre has no significant effect on mechanical and physical *** made with 2 wt%0.6 mm long MSCB fibres achieve promising results for non-structural civil engineering applications.

关键词： Sugarcane bagasse Treatment of effluents Chemical treatment Cementitious composites Mechanical properties Non-destructive test Design of experiment

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Formation and Evolution of Wakes in the Spacetime Generated by a Cosmic String in <i>f</i>(<i>R</i>) Theory of Gravity

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Journal of High Energy Physics, Gravitation and Cosmology 2022年第1期8卷 85-96页

作者： Gabriela Coutinho de Carvalho Maria Emília Xavier Guimarães pablo oliveira Mesquita Joaquim Lopes Neto Universidade Estadual do Rio de Janeiro Faculdade de Tecnologia Resende Brazil Instituto de Física Universidade Federal Fluminense Av. Litoranea S/N Niterói Brazil Instituto de Fsica Universidade Federal do Rio de Janeiro—UFRJ Av. Athos da Silveira Ramos Cidade Universitária Rio de Janeiro Brazil

The formation and evolution of cosmic string wakes in the framework of a f(R) theory of gravity are investigated in this work. We consider a simple model in which baryonic matter flows past a cosmic string. We treat this problem in the Zel’dovich approximation. We compare our results with previous results obtained in the context of General Relativity and Scalar-Theories of Gravity.

关键词： Topological Defects Alternative Theories of Gravity Structure Formation in the Universe

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Ecological intensification of cropping systems enhances soil functions,mitigates soil erosion,and promotes crop resilience to dry spells in the Brazilian Cerrado

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International Soil and Water Conservation Research 2021年第4期9卷 591-604页

作者： Lucas de Castro Moreira da Silva Junior Cesar Avanzi Devison Souza Peixoto Marina Neves Merlo Emerson Borghi Alvaro Vilela de resende Salvador Francisco Acuna-Guzman Bruno Montoani Silva Department of Soil Science Federal University of Lavras(UFLA)37200-900LavrasMGBrazil Department of Water Resources Federal University of Lavras(UFLA)37200-900LavrasMGBrazil Embrapa Maize and Sorghum Brazilian Agricultural Research Corporation(EMBRAPA)PO Box:28535701-970Sete LagoasMGBrazil Department of Physics Federal University of Lavras(UFLA)37200-900LavrasMGBrazil Center for Engineering and Industrial Development(CIDESI) Pie de la Cuesta 702Desarrollo San PabloQuerétaroQro.76125Mexico

Water scarcity threatens global food security and agricultural systems are challenged to achieve high yields while optimizing water *** deficit can be accentuated by soil physical degradation,which also triggers water losses through runoff and consequently soil *** soil health in cropping systems within the Brazilian Cerrado biome have been surveyed throughout the years,information about soil erosion impacts and its mitigation are still not well understood;especially concerning the role of cropping system diversification and its effects on crop ***,the aim of this study was to assess whether ecological intensification of cropping systems-inclusion of a consorted perennial grass and crop rotation-could promote soil coverage and consequently decrease water erosion and soil,water,and nutrient *** work studied the effects of crop rotation and consorted Brachiaria,along with different levels of investment in fertilization on soil physical quality and on soil,water,and nutrient losses,and crop *** proved that soybean monoculture(SS)is a system of low sustainability even under no-till in the Brazilian Cerrado *** exhibited high susceptibility to soil,water,and nutrient losses,causing low crop *** results showed that water losses in SS cropping system were approximately 10%of the total annual rainfall,and total K losses would require an additional 35%of K ***,ecological intensification of cropping systems resulted in enhanced soil environmental and agronomic functions,increased grain yield,and promoted soil and water conservation:high soil cover rate,and low soil,water and nutrient *** intensification proved to be an adequate practice to boost crop resilience to water deficit in the Brazilian Cerrado.

关键词： Crop rotation Grain production Nutrient losses Soil physical quality Tropical region

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