Pressures In Soil
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Phosphorus Forms in Sediments as Indicators of Anthropic Pressures in an Agricultural Catchment in Southern Brazil
ABSTRACT Phosphorus (P) fractionation is a suitable procedure to ascertain P lability in sediments and is able to distinguish sources of P under different soil management practices in a catchment. Brazil is the second largest producer and the largest exporter of tobacco in the world. Inadequate management of cultivated areas exposes the soil to erosion proce
Rev. Bras. Ciênc. Solo. Publicado em: 04/12/2017
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2. Estimates of Annual Soil Loss Rates in the State of São Paulo, Brazil
ABSTRACT: Soil is a natural resource that has been affected by human pressures beyond its renewal capacity. For this reason, large agricultural areas that were productive have been abandoned due to soil degradation, mainly caused by the erosion process. The objective of this study was to apply the Universal Soil Loss Equation to generate more recent estimate
Rev. Bras. Ciênc. Solo. Publicado em: 19/12/2016
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3. Seismic Pressures in Offshore Areas: Numerical Results
Abstract The purpose of this study is to obtain numerical estimations of seismic pressures in offshore areas considering the effect of seabed configurations and soil materials. To this end, the Boundary Element Method is used to irradiate waves, so that force densities can be obtained for each boundary element. From this hypothesis, Huygens´ Principle is im
Lat. Am. j. solids struct.. Publicado em: 2016-12
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4. Microbial quality of soil from the Pampa biome in response to different grazing pressures
The aim of this study was to evaluate the impact of different grazing pressures on the activity and diversity of soil bacteria. We performed a long-term experiment in Eldorado do Sul, southern Brazil, that assessed three levels of grazing pressure: high pressure (HP), with 4% herbage allowance (HA), moderate pressure (MP), with 12% HA, and low pressure (LP),
Genet. Mol. Biol.. Publicado em: 01/05/2015
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5. Exploring interactions of plant microbiomes
A plethora of microbial cells is present in every gram of soil, and microbes are found extensively in plant and animal tissues. The mechanisms governed by microorganisms in the regulation of physiological processes of their hosts have been extensively studied in the light of recent findings on microbiomes. In plants, the components of these microbiomes may f
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-12
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6. ANÁLISE DE DESEMPENHO EM TRAÇÃO DE RODADO SIMPLES E DUPLO EM UM TRATOR AGRÍCOLA / ANALYSIS OF TRACTION PERFORMANCE OF SINGLE AND DUAL TIRES IN AN AGRICULTURAL TRACTOR
A major problem of agricultural tractor during several operations in which it is used is the difficulty of working in various moisture conditions and soil types affect your ability to traction force, slip and fuel consumption. What has been observed is that with increased contact surface between the tire of the tractor and the ground, there is the possibilit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011
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7. Sistema de irrigação por capilaridade na produção de porta-enxertos de mudas citricas na fase de sementeira / Irrigation system by capillary action in the citrus rootstocks production in seedings stage
The water and nutrition management in the production of citrus rootstocks in the seedling phase performed by sprinkler systems, manually operated, presents the environmental outcome of water or residual solution disposal from the fertigation. The generated wastewater is generally discarded directly in the soil with the risk to reach the groundwater and conta
Publicado em: 2010
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8. tropical soils, bentonite, hydraulic conductivity, compatibility, barriers. / CONDUTIVIDADE HIDRÁULICA E COMPATIBILIDADE EM COMBINAÇÕES DE SOLO TROPICAL E BENTONITA PARA USO EM BARREIRAS
Barriers are key elements for the environmental protection in waste disposal sites. Additionally, compacted tropical soils have great potential to be used in these barriers, once some technical matters are correctly addressed, including low hydraulic conductivity and adequate compatibility to the disposed fluids. In this context, the bentonite addition in tr
Publicado em: 2009
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9. CARREGAMENTO ESTÁTICO E DINÂMICO E SUA RELAÇÃO COM TENSÃO, DEFORMAÇÃO E FLUXOS NO SOLO / STATIC AND DYNAMIC LOADING AND EFFECTS ON STRESS DISTRIBUTION, DEFORMATION AND FLOWS
O aumento do uso dos solos para a produção de alimentos vem causando problemas referentes à compactação nos diversos sistemas de exploração do solo, agrícola, pecuária e florestal. A degradação do solo causada pela compactação muitas vezes pode ser irreversível, sendo um problema mundial que vem se agravando ano após ano, pois as máquinas vê
Publicado em: 2009
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10. AvaliaÃÃo da retenÃÃo de gases em camadas de cobertura de aterros de resÃduos sÃlidos
Municipal solid waste landfills final covers work as a seal interface between the wastese and the external environment. This sealing layer is also responsible to avoid the infiltration of water into the waste mass and the emission of gases to the atmosphere. These interventions show by they own how important are both project and execution of the top cover as
Publicado em: 2008
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11. UMA PROPOSTA DE IMPLANTAÇÃO DE GESTÃO AMBIENTAL NO LABORATÓRIO DE ANÁLISES DE SOLOS DA UFSM / A ENVIRONMENTAL MANAGEMENT IMPLANTATION PROPOSAL IN THE LABORATORY OF ANALYSIS OF SOILS OF UFSM
The concern with the environmental performance comes demanding a different posture for the organizations from those that came more and more being adopted in the last decades. The governments pressures, fiscal control organs and the population in general display it selves more accentuated than never. The Higher Education Institutions (IES), its schools, cente
Publicado em: 2008
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12. AnÃlise de provas de carga realizadas em micro-estacas utilizadas no reforÃo das fundaÃÃes de uma ponte histÃrica do Recife-PE
This work was part of the recovery of the âSeis de MarÃoâ Bridge, at Santo AntÃnio, Recife-PE, Brazil, from where these studies were obtained. This work was developed in a partnership between the geotechnical engineering department â DEC/UFPE and private companies. The general objectives of this work are: (1) present concepts related to micropiles, (2)
Publicado em: 2008