Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 2 )

2019 ( 194 )

2018 ( 337 )

2017 ( 343 )

Custom range...

Search Results: 1 - 10 of 190123 matches for " Nelson Henrique de Lima Roque "
All listed articles are free for downloading (OA Articles)
Page 1 /190123
Display every page Item
How Much Do Adjuvant and Nozzles Models Reduce the Spraying Drift? Drift in Agricultural Spraying  [PDF]
Fabiano Griesang, Ricardo Augusto Decaro, Cícero Ant?nio Mariano dos Santos, Eduardo Souza Santos, Nelson Henrique de Lima Roque, Marcelo da Costa Ferreira
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.811188
Abstract: The spraying of herbicides in crops has become the main form of weed control. Although it means unexpected effects on non-target plants resulted by spraying drift. Thus, improvements in application techniques, as the best selection of spray nozzles and adjuvant, are essential to avoid environmental contamination and economic losses. On this work, we evaluate how much adjuvant associated with nozzles can reduce the spray drift. The nozzles used at experiment were air induction flat tip, hollow cone and twinjet and the spray liquids, which were composed of herbicide glyphosate and phosphatidylcholine + propionic acid adjuvant. Measurements were made at wind tunnel and droplet sizer, at laser diffraction method. The models of nozzles influence in droplet size characteristics and in occurrence of spray drift. The use of adjuvants reduces the spray drift only combined with the twinjet nozzle, while for the other models the adjuvant did not reduce the global spray drift at significant levels. The adjuvant reduced the spray drift until 39%, while the nozzles model reduced until 74%. Both techniques when combined were able to reduce until 80%. The model of nozzle has the biggest result on drift mitigation and the use of adjuvants can increase the drift mitigation specially with nozzles that produces smallest droplets.
Avalia??o do desempenho e da qualidade dos ovos de codornas de corte de dois grupos genéticos
Costa, Carlos Henrique Rocha;Barreto, Sergio Luiz de Toledo;Mesquita Filho, Roque Machado de;Araujo, Marcelle Santana de;Umigi, Regina Tie;Lima, Heder José D'Avila;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008001000016
Abstract: an experiment was conducted with the objective to evaluate the performance and quality of eggs from meat quails from two genetic groups during 84 days of experiment. a total of 98 birds averaging 258 kg and 40 days old was assigned to a completely randomized design with two genetic groups (a and b) and seven replications of seven birds each. the evaluated characteristics were: diet consumption (g/bird/d), average egg weights (g), laying per bird per day (%) and per lodged bird (%), percentage of viable eggs produced, percentage of viable eggs/bird/d, egg mass (g/bird/d), conversion by egg mass (kg/kg), conversion by egg dozen (kg/dz), specific gravity (g/cm3), egg yolk weight (g), albumen and shell, percentage of yolk, albumen and shell, height and diameter of eggs (mm), viability of birds (%), initial and final weight (g) and weight gain (g). the genetic group b showed lower initial weight at 40 days old, higher weight and percentage of shell and better specific gravity of eggs. the other characteristics did not differ between the genetic groups. both evaluated genetic groups have satisfactory performance in the period from 40 to 124 days old.
Study of poly(o-Ethoxyaniline) interactions with herbicides and evaluation of conductive polymer potential used in electrochemical sensors
Consolin Filho, Nelson;Leite, Fábio de Lima;Carvalho, Eduarda Regina;Venancio, Everaldo Carlos;Vaz, Carlos Manoel P.;Mattoso, Luiz Henrique C.;
Journal of the Brazilian Chemical Society , 2007, DOI: 10.1590/S0103-50532007000300013
Abstract: interactions of four aromatic nitrogen-heterocyclic herbicides (atrazine, imazaquin, metribuzin and paraquat) with the conductive polymer poly(o-ethoxyaniline)-poea, were studied with atomic force microscopy (afm), uv-visible spectrophotometry (uv-vis) and electrochemical impedance spectroscopy. afm profiles of self-assembled (sa) films of poea revealed that the polymer surface became rougher (on the nanoscale) when exposed to atrazine, imazaquin and metribuzin, but slightly smoother in contact with paraquat. this suggested that specific chemical interactions, possibly electroscopic, have occurred between nitrogen atoms in the polymer chain and the dissimilar groups in the various herbicide molecules, during adsorption of the latter onto the film. the uv-vis analyses indicated a stronger interaction of poea in solution with imazaquin, that has a special importance for the intended application. sensors produced by coating microelectrodes with sa films of poea were used to perform impedance spectroscopy in aqueous solutions of each herbicide. with the resulting data, it was possible to distinguish and set detection limits for each herbicide in water, corroborating afm and uv-vis results.
Soil Mapping of a Small Watershed in a Brazilian Savanna Biome: A Semi-Automatic Approach  [PDF]
Larissa Ane de Sousa Lima, Adriana Reatto, Henrique Llacer Roig
Journal of Geographic Information System (JGIS) , 2014, DOI: 10.4236/jgis.2014.62009

The objective of this work is to propose a semi-automatic methodology for the creation of a semidetailed to detailed watershed’s soil map. This methodological proposal is based on the traditional method (field work and photo interpretation) and on morphometric variables analysis, using data originated from the Digital Elevation Model (DEM) of the Shuttle Radar Topography Mission (SRTM) program. The steps taken through this methodological proposal were the identification of the hydromorphic areas boundaries through interpretation of aerial orthophotographs; the compartmentalization of the relief through color composition techniques using the morphometric variablesslope, altimetry and horizontal curvature; the development of a pedological database based on data gathered in the field; the elaboration of a preliminary soil map based on the compartmentalized relief and on the dataset of the soils sampled in the field; the elaboration and adjustment of the final soil map according to the interpretation of aerial photographs and also the physical and chemical analyses of the soils. This semi-automatic methodology demonstrated improved efficiency in defining the soil units, reducing operation time and subjectivity of the process, thereby contributing to the systematization of soil mapping at watershed level in scale 1:50,000, as well as, promoting better knowledge between the relation of the geomorphic and soil variables in the Brazilian Savanna Cerrado.

O Tribunal de Contas da Uni?o (TCU) e a gest?o ambiental brasileira: experiência recente
Lima, Luiz Henrique Moraes de;
Cadernos EBAPE.BR , 2005, DOI: 10.1590/S1679-39512005000300010
Abstract: the 1988 brazilian constitution increased and strengthened the environmental mandate of the tribunal de contas da uni?o - tcu, brazilian supreme audit institution. since 1998, with the definition of its environmental strategy, tcu has been an increasingly important player on the assessment of federal government environmental policies. the execution of many operational audits in government institutions and programs has resulted in detailed diagnostics and relevant recommendations towards increasing the effectiveness of environmental public policies. the paper describes and comments the evolution of tcu's inspections in recent years over the environmental management in brazil. comments are made about the environmental performance of other countries' supreme audit institutions. tcu's environmental strategy criteria are analyzed, as well as the determinations and recommendations of some recent decisions involving water resources management, environmental licensing and strategic environmental assessment. tcu's environmental performance is associated to the preventive, pedagogic and orienting model of control as opposed to the traditional a posteriori compliance model. to conclude, tcu's environmental action is assessed as positive for society and its intensification is recommended.
A Generalized Maximum Principle for Yau's Square Operator, with Applications to the Steady State Space
Antonio Caminha,Henrique de Lima
Mathematics , 2006,
Abstract: We derive, for the square operator of Yau, an analogue of the Omori-Yau maximum principle for the Laplacian. We then apply it to obtain nonexistence results concerning complete spacelike hypersurfaces with constant higher order mean curvature in the Steady State space.
Shedding Some Light over the Floral Metabolism by Arum Lily (Zantedeschia aethiopica) Spathe De Novo Transcriptome Assembly
Elizabete de Souza Candido, Gabriel da Rocha Fernandes, Sérgio Amorim de Alencar, Marlon Henrique e Silva Cardoso, Stella Maris de Freitas Lima, Vívian de Jesus Miranda, William Farias Porto, Diego Oliveira Nolasco, Nelson Gomes de Oliveira-Júnior, Aulus Estev?o Anjos de Deus Barbosa, Robert Edward Pogue, Taia Maria Berto Rezende, Simoni Campos Dias, Octávio Luiz Franco
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090487
Abstract: Zantedeschia aethiopica is an evergreen perennial plant cultivated worldwide and commonly used for ornamental and medicinal purposes including the treatment of bacterial infections. However, the current understanding of molecular and physiological mechanisms in this plant is limited, in comparison to other non-model plants. In order to improve understanding of the biology of this botanical species, RNA-Seq technology was used for transcriptome assembly and characterization. Following Z. aethiopica spathe tissue RNA extraction, high-throughput RNA sequencing was performed with the aim of obtaining both abundant and rare transcript data. Functional profiling based on KEGG Orthology (KO) analysis highlighted contigs that were involved predominantly in genetic information (37%) and metabolism (34%) processes. Predicted proteins involved in the plant circadian system, hormone signal transduction, secondary metabolism and basal immunity are described here. In silico screening of the transcriptome data set for antimicrobial peptide (AMP) –encoding sequences was also carried out and three lipid transfer proteins (LTP) were identified as potential AMPs involved in plant defense. Spathe predicted protein maps were drawn, and suggested that major plant efforts are expended in guaranteeing the maintenance of cell homeostasis, characterized by high investment in carbohydrate, amino acid and energy metabolism as well as in genetic information.
Compact Spacelike Hypersurfaces with Constant Mean Curvature in the Antide Sitter Space
Henrique F. de Lima,Joseilson R. de Lima
International Journal of Mathematics and Mathematical Sciences , 2009, DOI: 10.1155/2009/673508
Abstract: We obtain a height estimate concerning to a compact spacelike hypersurface Σ immersed with constant mean curvature in the anti-de Sitter space ?1
Use of Silicon in Mitigating Ammonium Toxicity in Maize Plants  [PDF]
Cid Naudi Silva Campos, Renato de Mello Prado, Cassiano Garcia Roque, Antonio Jo?o de Lima Neto, Luiz Junior Pereira Marques, Aridênia Peixoto Chaves, Claudia Amaral Cruz
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.611178
Abstract: Silicon is a beneficial element that can mitigate abiotic stresses, such as ammonium toxicity. The objective herein was to evaluate the effects of silicon (Si) on mitigating toxicity caused by excess ammonium in maize plants grown in nutrient solution. An experiment was conducted with maize plants (cultivar DKB 390 VT Pro II) grown in a greenhouse in pots (8 L) in a hydroponic system. The treatments were arranged in a 2 × 2 factorial, consisting of two ammonium concentrations (30 and 60 mmol·L-1) in the absence and presence of Si (10 mmol·L-1), arranged in a completely randomized design with six repetitions. At 28 days after applying the treatments the dry mass of shoots and roots was evaluated, along with accumulation of silicon and nitrogen in the shoots. The use of silicon resulted in increases in the studied variables, regardless of ammonium concentrations. Silicon reduced the effect of toxicity caused by ammonium excess in maize plants, resulting in greater growth and dry matter accumulation.
A KNN Undersampling Approach for Data Balancing  [PDF]
Marcelo Beckmann, Nelson F. F. Ebecken, Beatriz S. L. Pires de Lima
Journal of Intelligent Learning Systems and Applications (JILSA) , 2015, DOI: 10.4236/jilsa.2015.74010
Abstract: In supervised learning, the imbalanced number of instances among the classes in a dataset can make the algorithms to classify one instance from the minority class as one from the majority class. With the aim to solve this problem, the KNN algorithm provides a basis to other balancing methods. These balancing methods are revisited in this work, and a new and simple approach of KNN undersampling is proposed. The experiments demonstrated that the KNN undersampling method outperformed other sampling methods. The proposed method also outperformed the results of other studies, and indicates that the simplicity of KNN can be used as a base for efficient algorithms in machine learning and knowledge discovery.
Page 1 /190123
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.