Rotation Sequence
Mostrando 1-12 de 82 artigos, teses e dissertações.
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1. Rapid Generation of Particle Packs at High Packing Ratios for DEM Simulations of Granular Compacts
Abstract In this work we present a simple, fast technique for generating particle packs at high packing ratios aiming at the simulation of granular compacts via the discrete element method (DEM). We start from a random sequence addition particle generation algorithm to generate a "layer" of non-overlapping spherical particles that are let to evolve dynamical
Lat. Am. j. solids struct.. Publicado em: 2016-01
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2. Instrumentos virtuais de desenho e a argumentação em geometria
This dissertation presents a proposal to work, at school, the deductive reasoning in geometry. The proposal makes use of digital material consisting of virtual drawing tools that perform geometric transformations of translation, reflection, rotation and enlargement. Making use of digital material, it was developed a didactic sequence consists of three stages
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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3. Sismologia e Rotação ao Longo da Sequência Principal / Asteroseismology and Rotation in the Main Sequence
Asteroseismology provides a unique opportunity to probe the inner properties of stars through the study of stellar oscillations. These oscillations depend on the physics of the cavity where they are formed. However, the stellar rotation introduces an axis of symmetry and lifts the degeneracy of the frequencies, thus hindering the identification. The goal of
Publicado em: 2011
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4. The effect of cover crop and crop rotation on soil water storage and on sorghum yield.
Crop rotation and cover crop can be important means for enhancing crop yield in rainfed areas such as the lower Coastal Bend Region of Texas, USA. A trial was conducted in 1995 as part of a long-term cropping experiment (7 years) to investigate the effect of oat (Avena sativa L.) cover and rotation on soil water storage and yield of sorghum (Sorghum bicolor
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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5. Crop rotation reduces weed competition and increases chlorophyl concentration and yield of rice.
Crop rotation is an essential in sustainable agricultural systems, because its effects on soil fertility and other benefits including reduction on weed competition. A field experiment was carried out at the UEMA experimental station, Sao Luis, Maranhao State, Brazil, to evaluate the effect of crop rotation on weed population, leaf chlorophyll concentration a
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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6. Effects of soil management systems on soil microbial activity, bulk density and chemical properties.
The objective of this experiment was to study the effects of soil management systems on the bulk density, chemical soil properties, and on the soil microbial activity on a Latossolo Vermelho distrófico (Oxisol). Soil samples were collected from plots under the following management conditions: a) natural dense "cerrado" vegetation (savanna); b) degraded Brac
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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7. Dependência micorrízica de diferentes culturas anuais, adubos verdes e pastagens em solos de cerrado.
ABSTRACT: The arbuscular mycorrhizal fungi in the soil may establish an association with plant roots (mycorrhiza) which benefits the nutrient absorption by the plants and increase the effects of the applied inputs on plant growth. Then, to make profit of this association, it is recommended to increase and diversity fungi in the soil, mainly in those where it
Planaltina. Publicado em: 2011
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8. Clinical and laboratory evaluation of metallic brackets bonded with orthodontic composites / Avaliação clinica e laboratorial da colagem de braquetes metalicos com compositos ortodonticos
The aim of this study was to assess clinically and laboratory the bracket failure rate and shear bond strength of metallic brackets bonded with orthodontic composites. The in vivo study consisted of 20 patients aged between 10.5 to 15.1 years old who had sought corrective orthodontic treatment. Brackets were bonded of the second premolar - second premolar to
Publicado em: 2009
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9. Rotational placement of irregular polygons over containers with fixed dimensions using simulated annealing and no-fit polygons
This work deals with the problem of minimizing the waste of space that occurs on a rotational placement of a set of irregular bi-dimensional small items inside a bi-dimensional large object. This problem is approached with an heuristic based on simulated annealing. Traditional " external penalization" techniques are avoided through the application of the no-
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-09
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10. Possibilidades da aprendizagem de transformações geométricas com o uso do Cabri-Géomètre
This study is fitted in the Technology of Information and Mathematics Educations line of researching according to the teaching board and the geometric learning, in particular about the Plane Geometry Transformations, and has as a goal to present didactic sequences in which the activities that involve a axial symmetry and the symmetry of rotation promote to t
Publicado em: 2008
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11. Biomassa microbiana em diferentes sistemas de manejo do solo e de culturas típicas da região norte do Paraná
The objective of this work was to evaluate the soil microbial biomass (SMB) as a parameter bioindicador of changes in agroecosystem under different soil management and crop rotation systems. The SMB was examined in four different Long-term experiments: In experiment 1: with 26 year-old field experiment established consisting of four systems soil management:
Publicado em: 2008
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12. Emissões de CO2, NOx e N2O em solos sob diferentes cultivos na região do cerrado / CO2, NOx and N2O emissions from soils to the atmosphere under differente cropping systems in the cerrado region
The objective of the study was to evaluate the CO2, NO, N2O emissions from Oxisols (Latossolos) under different no-till cropping systems in the Cerrado region (Central Brazil). The results are presented in three chapters. Chapter 1 presents a study on the effects of increasing doses of nitrogen fertilizer on the fluxes of trace gases along the crop cycle of
Publicado em: 2008