Search | SciELO

Need help?

Add field +

Search history

No documents were found for your search

Results: 39

au:NETO, W. B.

Filters

Collection + Options

All
Brazil

38
Public Health

1

Journal + Options

All
Revista Brasileira de Engenharia Agrícola e Ambiental

13
Engenharia Agrícola

8
Journal of the Brazilian Chemical Society

3
Journal of Microwaves, Optoelectronics and Electromagnetic Applications

2
Planta Daninha

2
Revista de Saúde Pública

2
Trends in Computational and Applied Mathematics

2
Brazilian Journal of Chemical Engineering

1
Brazilian Journal of Medical and Biological Research

1
Cadernos EBAPE.BR

1
Eclética Química

1
Pesquisa Veterinária Brasileira

1
Química Nova

1
Rodriguésia

1

Language

All
Portuguese

17

Publication Year + Options

All
2014

5
2009

4
2021

4
2012

3
2013

3
1984

2
2016

2
2017

2
2018

2
2019

2
1999

1
2000

1
2004

1
2005

1
2007

1

Show all...

SciELO Thematic Areas + Options

All
Agricultural Sciences

24
Exact and Earth Sciences

7
Engineering

3
Health Sciences

3
Biological Sciences

2
Applied Social Sciences

1

WoS Subject Categories + Options

All
Engineering

24
Agricultural

21
Sciences

17
Environmental

14
Chemistry

5
Multidisciplinary

5
Plant

3
Applied

2
Electrical

2
Electronic

2
Health

2
Mathematics

2
Optics

2
Biology

1
Chemical

1

Show all...

WoS Citation Index + Options

All
Science Citation Index Expanded

15
Social Sciences Citation Index

6

Citables and non citables

All
Citable

39

Type of Literature + Options

All
Article

38
Article-commentary

1

Order by

Page of 3 Next

Select this page

Print | Send to email | Export |

Facebook
Twitter
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

0 Selected itens

List all
Erase all

Absorb/Transmit Broadband Type Frequency Selective Surface
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

G. P. Neto, José Jaime

; Campos, Antonio Luiz P. S.

; Lira, Ruann Victor de A.

; Gomes Neto, Alfredo

; Silva, Maurício W. B.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

Journal Metrics
- Sobre o periódico
- SciELO Analytics

mar 2023, Volume 22 N. 1 Pages 1 - 12

Abstract: En | Text: En | PDF: En

Abstract Frequency Selective Surfaces (FSS) are increasingly being used in telecommunications systems due to the numerous advantages presented by this sort of structure, among them low cost, ease of fabrication, and low profile stand out. This work reports the design, fabrication, and characterization of a multilayer frequency-selective absorber (FSA) for broadband operation. The proposed structure shows an absorption performance (operating in the frequency range between 2 GHz and 6 GHz) within the transmission band. The absorber consists of cascaded frequency selective surfaces, which are composed of both conductive square loops, which reflect incident signals, and resistive ones, which act as an absorbing layer. To verify the absorbing structure performance, full-wave numerical simulations and measurements are presented. The measured results are in good agreement with the numerical ones and show that the design performs absorption above 80% within the range of 2.48 GHz to 6.13 GHz, which verifies the project properties. Besides that, numerical results show that the proposed absorber has a proper response under oblique incidence up to 30°.

https://doi.org/10.1590/2179-10742023v22i1268430

Thermal performance of aviary located in the semiarid region of Pernambuco based on computer simulation
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Gonçalves, Indira C. M.

; Turco, Sílvia H. N.

; Lopes Neto, José P.

; Nascimento, José W. B. do

; Lima, Vera L. A. de

; Borges, Valéria P.

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jul 2022, Volume 26 N. 7 Pages 533 - 540

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Para estudos de desempenho térmico, a modelagem computacional tem sido apresentada como uma importante ferramenta na tomada de decisões para solucionar problemas complexos e cotidianos na produção e pesquisa em avicultura. Desta forma, o presente estudo teve como objetivo validar modelos computacionais desenvolvidos por meio do programa EnergyPlus e a partir destes avaliar o desempenho térmico de um aviário com diferentes tipos de telhas (termoacústicas, cerâmicas, fibrocimento e metálicas). A pesquisa consistiu em duas etapas: uma fase experimental e outra fase para a simulação computacional das condições climáticas em quatro modelos de aviário, considerando diferentes tipos de telhas. A fase experimental foi conduzida em duas estações climáticas, inverno (2019) e verão (2020), onde foram aferidos e registrados os dados de temperatura e umidade relativa do ar através de seis data loggers HOBO modelo H12, distribuídos no interior de um aviário localizado no semiárido pernambucano. Para a simulação computacional, foi desenvolvido um modelo virtual do galpão com auxílio da interface gráfica de usuário OpenStudio no Sketchup, e posteriormente o cálculo do desempenho térmico foi realizado por meio do software EnergyPlus. A validação dos modelos mostrou uma forte correlação entre os dados obtidos de maneira experimental e os simulados, apresentando valores do coeficiente de correlação de Pearsons (r) maiores que 0.95. As simulações demonstraram a influência das telhas no desempenho térmico da edificação avaliada, onde para as condições climáticas do semiárido pernambucano, o melhor desempenho térmico foi apresentado pelas telhas termoacústicas, seguido das telhas cerâmicas, de fibrocimento e metálicas.

ABSTRACT For studies of thermal performance, computational modeling has been presented as an important decision-making tool to solve complex and everyday problems in poultry production and research. Thus, the present study aimed to validate computational models developed using the EnergyPlus software package and, based on these, evaluate the thermal performance of a poultry house with different types of tiles (thermoacoustic, ceramic, fiber-cement, and metal). The research consisted of two stages: an experimental phase and another phase in which the climatic conditions in four aviary models are numerically simulated, considering different types of tiles. The experimental phase was conducted in two climate seasons, winter (2019) and summer (2020), where air temperature and relative air humidity data were measured and recorded using six HOBO model H12 data loggers distributed inside an aviary located in the semiarid region of Pernambuco state, Brazil. For the computer simulation, a virtual model of the house was developed using the OpenStudio graphical user interface in Sketchup, and the thermal performance was calculated using the EnergyPlus software package. The models were validated, showing a strong correlation between the experimental and simulated data, with Pearson’s correlation coefficient (r) values greater than 0.95. The simulations demonstrated the influence of the roof tiles on the thermal performance of the evaluated building. For the climatic conditions of the semiarid region of the Pernambuco state, thermoacoustic roof tiles presented the best thermal performance, followed by ceramic, fiber-cement, and metal roof tiles.

https://doi.org/10.1590/1807-1929/agriambi.v26n7p533-540

An Inverse Problem Approach for the Estimation of the Haverkamp and van Genuchten Retention Curves Parameters with the Luus-Jaakola Method
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

FERREIRA, F. F.

; TEMPERINI, M. DE O.

; TELLES, W. R.

; LYRA, G. B.

; SILVA NETO, A. J.

Trends in Computational and Applied Mathematics

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 2021, Volume 22 N. 2 Pages 265 - 278

Abstract: En | Text: En | PDF: En

ABSTRACT In academia, the study of the movement of water in the ground has been widespread since the last century. The same can be determined using the Richards equation. This is a nonlinear parabolic partial differential equation that requires parameters to generate the results of the problem. Some authors have proposed equations that represent the relationship between volumetric moisture and soil water potential, such as Haverkamp and van Genuchten. As main objective of this work, the inverse modeling was implemented to obtain the Richards equation parameters, applying the Luus-Jaakola method. To verify the mathematical model, a sensitivity analysis was performed, which allowed the observation of the effect that each parameter has on the output data, implying a linear dependence. The results produced proved to be satisfactory for the problem analyzed in our research.

https://doi.org/10.5540/tcam.2021.022.02.00265 891 downloads

Inverse Modeling of Radiative Transfer by Two-Stream Approximation using the Luus-Jaakola Method
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

KRIEGER, J. M.

; LYRA, G. B.

; FERREIRA, F. F.

; TELLES, W. R.

; SOUZA, J. L.

; SILVA NETO, A. J.

Trends in Computational and Applied Mathematics

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 2021, Volume 22 N. 2 Pages 325 - 340

Abstract: En | Text: En | PDF: En

ABSTRACT The simulation of terrestrial ecosystem processes, using numerical biosphere-atmosphere models that can be coupled to the Atmospheric Models, assist in a better diagnosis and forecast of climate and weather. To be able to represent a particular region, biome or ecosystem, the model parameters need to be fitted for local conditions. This work aims to assess the Luus-Jaakola (LJ) method in the optimization of the parameters in a two-stream radiative transfer model applied to a vegetation canopy. Solar radiation components (incident, S ↓, and reflected, S ↑) were measured above a sugarcane crop in a Tropical region from February 17 to 24, 2006. Among the combinations of internal and external iterations evaluated for Luss-Jaakola method, 60/30 (external/internal) iterations presented more precise albedo ( α = S ↑ / S ↓ ) simulated ( r 2 = 0 . 7386 ) and, for the accuracy of the simulated α, even though the 60/40 combination had the smallest percentual error (6.40%), the 60/30 combination was 0.03% higher. The precision and accuracy of S ↑ was greater with the parameters obtained by the inverse problem with the combination of 60/30 (external/internal) iterations respectively. In general, the behavior of simulated S ↑ at the top of the canopy was underestimated compared to the observed S ↑, especially in the early morning. For the simulated α at the top of the canopy, the model’s overestimation was observed at the lowest values of albedo. When the largest albedos are observed, only at the beginning of the day the model underestimated the values. As shown by the tests result, the parameters optimized by Luus-Jaakola method have an adequate representation of the observed data.

https://doi.org/10.5540/tcam.2021.022.02.00325 165 downloads

Proposed Technique of Analysis for Absorber/Transmitter Frequency Selective Surfaces
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Santos, Eliel P. dos

; Campos, Antonio L. P. S.

; Gomes Neto, Alfredo

; Silva, Maurício W. B.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jun 2021, Volume 20 N. 2 Pages 435 - 444

Abstract: En | Text: En | PDF: En

Abstract In this paper, we propose a simple technique to analyze absorber/transmitter frequency selective surfaces (FSS). The structure is formed by two FSS, one resistive and one conductive. Both FSS are printed on an FR4 dielectric substrate. The square loop and crossed dipole are the geometries considered in this paper. The technique combines two simple approaches, the equivalent circuit method, and the scattering matrix method. Two prototypes were built for validation purposes. Simulated and measured results are in good agreement.

https://doi.org/10.1590/2179-10742021v20i21004 154 downloads

Design, Synthesis and Antifungal Activity of New Schiff Bases Bearing 2-Aminothiophene Derivatives Obtained by Molecular Simplification
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Luna, Isadora S.

; Neves, Wendell W.

; Lima-Neto, Reginaldo G. de

; Albuquerque, Amanda P. B.

; Pitta, Maíra G. R.

; Rêgo, Moacyr J. B. M.

; Neves, Rejane P.

; Scotti, Marcus T.

; Mendonça-Junior, Francisco J. B.

Journal of the Brazilian Chemical Society

Journal Metrics
- Sobre o periódico
- SciELO Analytics

may 2021, Volume 32 N. 5 Pages 1017 - 1029

Abstract: En | Text: En | PDF: En

Seventeen Schiff bases bearing 2-aminothiophene derivatives were designed and synthesized using molecular simplification. The resulting compounds (4a-4q) were evaluated for their in vitro antifungal activity against dermatophytes. Prediction of their druglikeness and pharmacokinetic properties, establishment of their structure-activity relationships (SAR), and cytotoxic evaluation of the most active compounds were performed. Using an eco-friendly procedure, microwave assisted synthesis resulted in compounds in good yields (35-85%). Compounds 4a-4q presented good druglikeness and pharmacokinetic profiles and no cytotoxicity for any cell line tested up to 100 µM. The compounds presenting the best antifungal profiles were 4e, 4f, 4g, 4k, 4l, 4m, 4o and 4p with more than one minimum inhibitory concentration (MIC) value occurring between 16-64 µg mL-1, thus, in some cases better than the reference drug (fluconazole). SAR testing indicated that the presence of halogens and nitro substituents increases antifungal activity. Taken together, the results demonstrate that 2-aminothiophene derivatives are promising lead compounds for the development of antifungal drugs.

https://doi.org/10.21577/0103-5053.20210004 163 downloads

Fiber-reinforced concrete for the flat bottom of silos
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Constantino, Rodrigo A.

; Lopes Neto, José P.

; Nóbrega, Marcilene V. da

; Nascimento, José W. B. do

; Silva, Jefferson H. G. da

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

apr 2020, Volume 24 N. 4 Pages 274 - 279

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO O emprego de fibras sintéticas como reforço para concretos em substituição das armaduras de aço vem sendo difundido mundialmente em diversas aplicações, ganhando destaque na aplicação para pisos industriais, revestimentos de túneis, pavimentos rodoviários, etc., isto é, estruturas contínuas em contato com o solo que requerem desempenho no meio elástico. O presente trabalho investiga a aplicabilidade do concreto reforçado com fibras sintéticas na laje de fundo de silos apoiados diretamente sobre o solo, sendo o mesmo composto por um estudo experimental e um estudo de caso. O estudo experimental resume-se na análise do comportamento mecânico desse concreto, testando-se três concentrações de fibras sintéticas (3.0, 4.5 e 6.0 kg m-3) numa matriz de concreto simples convencional. O estudo de caso consiste no dimensionamento dessa peça em concreto armado convencional e concreto reforçado com fibras sintéticas, com o objetivo de realizar um comparativo econômico entre os dois projetos. Os resultados experimentais mostraram que a concentração de fibras que contribuiu para melhor desempenho mecânico da matriz de concreto foi o de 3.0 kg m-3. O estudo de caso mostrou que o projeto mais econômico foi o dimensionado com concreto reforçado com fibras.

ABSTRACT The use of synthetic fibers as reinforcement for concrete replacing the steel reinforcement has been diffused worldwide in several applications, gaining prominence in the application for industrial floors, tunnel linings, road pavements, etc., i.e., continuous structures in contact with soil that require performance in the elastic medium. The present study investigated the applicability of concrete reinforced with synthetic fibers in the bottom slab of silos supported directly on the ground, being composed of an experimental study and a case study. The experimental study consisted of the analysis of the mechanical behavior of this concrete by testing three concentrations of synthetic fibers (3.0, 4.5 and 6.0 kg m-3) in a conventional simple concrete matrix. The case study consisted of the design of this part in conventional reinforced concrete and concrete reinforced with synthetic fibers with the objective of performing an economic comparison between the two projects. The experimental results showed that the fiber concentration that contributed to a better mechanical performance of the concrete matrix was 3.0 kg m-3. The case study showed that the most economical design was the one made with fiber-reinforced concrete.

https://doi.org/10.1590/1807-1929/agriambi.v24n4p274-279 940 downloads

Diagnosis and validation by computational fluid dynamics of poultry house with negative pressure ventilation
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Cunha, Gisele C. de A.

; Lopes Neto, José P.

; Furtado, Dermeval A.

; Borges, Valéria P.

; Freire, Elias A.

; Nascimento, José W. B. do

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

oct 2019, Volume 23 N. 10 Pages 761 - 767

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO A ventilação à pressão negativa em aviários vem sendo utilizada para viabilizar a correção de seus microclimas internos, sendo que pesquisas apontam para a distribuição heterogênea do ar ao longo dos galpões e inadequação das variáveis ambientais às faixas recomendadas para o conforto térmico de aves adultas, especialmente nas horas mais quentes do dia. Objetivou-se, neste estudo, diagnosticar as instalações de um aviário no estado da Paraíba, quanto à distribuição das variáveis ambientais e ao conforto térmico, desenvolver um modelo computacional e validá-lo mediante simulações utilizando dinâmica de fluidos computacional - DFC. O registro da temperatura do ar (Tar), umidade relativa do ar (UR) e velocidade do vento (Vv) permitiu caracterizar o ambiente interno por comparação com as faixas recomendadas para cada variável e por meio do índice de temperatura, umidade e velocidade do vento (ITUV). O galpão não provem conforto às aves adultas alojadas, entre 12 e 14 h, com ITUV indicativo de alerta e valores de Tar, UR e Vv não pertinentes às faixas recomendadas; o modelo DFC do aviário foi validado com médias de Tar coletadas em campo de 27,75 ± 1,35 oC e simuladas de 27,85 ± 0,55 oC, médias de UR coletadas de 83 ± 12% e simuladas de 78 ± 3% e médias de Vv coletadas de 2,35 ± 1,35 m s-1 e simuladas de 2,50 ± 1,50 m s-1.

ABSTRACT Negative pressure ventilation in poultry houses has been used to enable the correction of their internal microclimates, and studies point to the heterogeneous distribution of air along the aviaries and the inadequacy of the environmental variables to the recommended ranges for thermal comfort of adult birds, especially in the hottest hours of the day. This study aimed to diagnose the facilities of a poultry house in the state of Paraíba, Brazil, regarding the distribution of environmental variables and thermal comfort; develop a computational model and validate it for Computational Fluid Dynamic - CFD simulations. Air temperature (Tair), air relative humidity (RH) and air velocity (Vair) data allowed characterizing the internal environment by comparison with the recommended ranges for each variable and by the temperature-humidity-velocity index (THVI). The poultry house does not provide comfort for the housed adult birds, between 12 and 14 h, with THVI indicating alert and Tair, RH and Vair values outside the recommended ranges; the CFD model for the poultry house was validated with Tair averages collected in the field of 27.75 ± 1.35 ºC and simulated of 27.85 ± 0.55 ºC, mean values of RH collected of 83 ± 12% and simulated of 78 ± 3%, and means of Vair collected of 2.35 ± 1.35 m s-1 and simulated of 2.50 ± 1.50 m s-1.

https://doi.org/10.1590/1807-1929/agriambi.v23n10p761-767 723 downloads

Where do we aspire to publish? A position paper on scientific communication in biochemistry and molecular biology
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Baptista, M.S.

; Alves, M.J.M.

; Arantes, G.M.

; Armelin, H.A.

; Augusto, O.

; Baldini, R.L.

; Basseres, D.S.

; Bechara, E.J.H.

; Bruni-Cardoso, A.

; Chaimovich, H.

; Colepicolo Neto, P.

; Colli, W.

; Cuccovia, I.M.

; Da-Silva, A.M.

; Di Mascio, P.

; Farah, S.C.

; Ferreira, C.

; Forti, F.L.

; Giordano, R.J.

; Gomes, S.L.

; Gueiros Filho, F.J.

; Hoch, N.C.

; Hotta, C.T.

; Labriola, L.

; Lameu, C.

; Machini, M.T.

; Malnic, B.

; Marana, S.R.

; Medeiros, M.H.G.

; Meotti, F.C.

; Miyamoto, S.

; Oliveira, C.C.

; Souza-Pinto, N.C.

; Reis, E.M.

; Ronsein, G.E.

; Salinas, R.K.

; Schechtman, D.

; Schreier, S.

; Setubal, J.C.

; Sogayar, M.C.

; Souza, G.M.

; Terra, W.R.

; Truzzi, D.R.

; Ulrich, H.

; Verjovski-Almeida, S.

; Winck, F.V.

; Zingales, B.

; Kowaltowski, A.J.

Brazilian Journal of Medical and Biological Research

Journal Metrics
- Sobre o periódico
- SciELO Analytics

2019, Volume 52 N. 9 elocation e8935

Abstract: En | Text: En | PDF: En

The scientific publication landscape is changing quickly, with an enormous increase in options and models. Articles can be published in a complex variety of journals that differ in their presentation format (online-only or in-print), editorial organizations that maintain them (commercial and/or society-based), editorial handling (academic or professional editors), editorial board composition (academic or professional), payment options to cover editorial costs (open access or pay-to-read), indexation, visibility, branding, and other aspects. Additionally, online submissions of non-revised versions of manuscripts prior to seeking publication in a peer-reviewed journal (a practice known as pre-printing) are a growing trend in biological sciences. In this changing landscape, researchers in biochemistry and molecular biology must re-think their priorities in terms of scientific output dissemination. The evaluation processes and institutional funding for scientific publications should also be revised accordingly. This article presents the results of discussions within the Department of Biochemistry, University of São Paulo, on this subject.

https://doi.org/10.1590/1414-431x20198935 1769 downloads

10.

PRODUCTION AND QUALITY OF JAPANESE QUAIL EGGS SUBMITTED TO ENVIRONMENTS WITH DIFFERENT LIGHT SPECTRUMS
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Furtado, Dermeval A.

; Braz, José R. B.

; Nascimento, Jose W. B. do

; Lopes Neto, José P.

; Oliveira, Daniele L.

Engenharia Agrícola

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 2018, Volume 38 N. 4 Pages 504 - 509

Abstract: En | Text: En | PDF: En

ABSTRACT The aim of this research was to evaluate the performance of Japanese quail (Coturnix coturnix japonica), with 94 (+49) days of age, through the production and quality of the eggs, with the birds kept in environments illuminated with LED lamps in the colors white, blue and red. The experimental design was a completely randomized design with three treatments (lamp colors) and seven replications. In the three environments, the relative air temperature averages can be considered above the thermal comfort zone for quails; however, the black globe temperature index, humidity and the thermal radiation load can be considered comfortable. The laying percentage of the birds kept under white LED was inferior to those maintained in the red LED. The feed intake, the feed conversion, the average weight and the egg quality were not affected by the different lamp colors (P <0.05) or by the climatic indexes that were within the average for the species, and these lamps could be used in the production of quail eggs.

https://doi.org/10.1590/1809-4430-eng.agric.v38n4p504-509/2018 889 downloads

11.

Physical-mechanical properties of multinutrient blocks with different binders for goats and sheep intake
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Furtado, Dermeval A.

; Castro, Thiago B. de S.

; Lopes Neto, Jose P.

; Constantino, Rodrigo A.

; Cunha, Maria das G. G.

; Nascimento, José W. B. do

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 2018, Volume 22 N. 8 Pages 558 - 563

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO A suplementação alimentar com blocos multinutricionais (BM’s) para caprinos e ovinos pode ser uma alternativa viável no semiárido brasileiro, necessitando-se definir a dureza ideal para se obter a máxima eficácia alimentar. Portanto, o objetivo do trabalho foi avaliar a confecção de BM’s utilizando-se cinco aglomerantes: cimento Portland, cal, caulim, cimento Portland + caulim e cal + bentonita, em duas percentagens (7,5 e 10%) e dois tempos de cura (72 e 96 h). O delineamento experimental foi o inteiramente casualizado em esquema fatorial 5 x 2 x 2 (aglomerantes, percentagens e tempos de cura, respectivamente), com cinco repetições. A utilização da cal nos BM’s promoveu maior resistência aos corpos de prova (208,53 kPa), garantindo maior dureza aos blocos. Não houve alteração na dureza dos blocos com o tempo de cura, recomendando-se uma cura de 72 h. Houve maior absorção de água com a utilização do cimento Portland e o uso do caulim e de cal + bentonita proporcionou as menores absorções de água. O uso da cal a 10% como aglomerante e o tempo de cura de 72 h demonstraram ser a melhor combinação na confecção dos blocos multinutricionais.

ABSTRACT Feed supplementation with multinutrient blocks (MB) for sheep and goats can be a viable alternative in the Brazilian semiarid region, and it is necessary to set an ideal hardness to obtain maximum feed efficiency. Therefore, this study aimed to evaluate the manufacture of MB using five binders: Portland cement, lime, kaolin, Portland cement + kaolin and lime + bentonite, at two percentages (7.5 and 10%) and two healing times (72 and 96 h). The experimental design was completely randomized in a 5 x 2 x 2 factorial scheme (binders, percentages and healing times, respectively), with five repetitions. Using lime in the MBs led to greater resistance in the specimens (208.53 kPa), as well as the greater percentage of binders (10%), ensuring higher hardness in the blocks. No change was observed in block hardness with the healing time, and a cure of 72 h is recommended. There was greater water absorption with the use of Portland cement and the use of kaolin and of lime + bentonite led to the lowest values of water absorption. The use of lime at 10% as binder and the 72 h healing time were shown to be the best combination in the manufacture of multinutrient blocks.

https://doi.org/10.1590/1807-1929/agriambi.v22n8p558-563 832 downloads

12.

Defoliation of sweet corn plants under irrigation depths and its impact on gas exchange
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Santos, Osvaldir F. dos

; Lima, Sebastião F. de

; Paiva Neto, Vespasiano B. de

; Piati, Gabriel L.

; Osório, Christian R. W. de S.

; Souza, Hugo M. de

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

dec 2017, Volume 21 N. 12 Pages 822 - 827

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Objetivou-se neste trabalho avaliar as trocas gasosas foliares de plantas de milho doce em função da desfolha, quando submetidas a diferentes lâminas de irrigação. O delineamento experimental foi em blocos casualizados em esquema de parcelas subdivididas, tendo nas parcelas quatro lâminas de irrigação 50, 75, 100 e 125% da evapotranspiração da cultura (ETc) e nas subparcelas três níveis de desfolha (0%, testemunha; 35%, remoção de quatro folhas completamente expandidas; 100% remoção total das folhas - secção da parte aérea) com três repetições, sendo a desfolha realizada manualmente quando a planta apresentava quatro folhas completamente expandidas. Verificou-se que os níveis de irrigação e desfolha afetam as trocas gasosas foliares em plantas de milho doce, permitindo a conclusão de que a planta quando submetida a estresses foliares, tende a ativar um mecanismo de compensação fotossintética, podendo variar em função do grau de severidade e da disponibilidade hídrica a qual está submetida. Os valores mais expressivos de trocas gasosas em folhas de milho doce que não tiveram desfolha foram, de forma geral, observados nas lâminas de irrigação estimadas entre 87 e 99% da ETc e nos tratamentos com desfolha, independente do nível ocorrido, na lâmina de 125% da ETc.

ABSTRACT The objective of this work was to evaluate leaf gas exchanges of sweet corn as a function of defoliation when submitted to different irrigation depths. The experimental design was randomized blocks in split-plot scheme, with four irrigation depths in the plots [50, 75, 100 and 125% of crop evapotranspiration (ETc)], and three levels of defoliation in the subplots (0%, control; 35%, removal of four fully expanded leaves; 100%, total removal of the leaves - section of the aerial part) with three replicates. Defoliation was manually performed when the plant had four fully expanded leaves. It was verified that the dephs of irrigation and defoliation levels affect leaf gas exchanges in sweet corn plants, allowing the conclusion that the plant tends to activate a mechanism of photosynthetic compensation, when subjected to leaf stress, which can vary according to the degree of severity and water availability to which it is submitted. The most expressive values of gas exchanges in sweet corn plants that did not have defoliation were generally observed at irrigation depths estimated between 87 and 99% ETc and, in the treatments with defoliation, regardless of the level, at irrigation depth of 125% ETc.

https://doi.org/10.1590/1807-1929/agriambi.v21n12p822-827 1864 downloads

13.

FLOW PROPERTIES AND PATTERN FLOW PREDICTION OF FOOD INDUSTRIAL POWDERS
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Lopes Neto, José P.

; Meira, Ariadne S.

; Nascimento, José W. B. do

Engenharia Agrícola

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 2017, Volume 37 N. 4 Pages 627 - 636

Abstract: En | Text: En | PDF: En

ABSTRACT: More and more industries are faced with new products that need to be stored in silos which, in general, require knowledge of their physical properties and, above all, flow. Food industries are among those using powders as raw materials likely to develop functional problems. Thus, the aim of the present study was to investigate the flow properties of six food powders using equipment called Powder Flow Tester, and the results were compared with those recommended by the Eurocode 1 Part 4 international standard. Wide range of variation in the flow properties responses was observed, suggesting that their expression through a single average value may not be suitable for vertical silos. It was concluded that only the bulk density of products is in accordance with the standard. In relation to flow, only flaked corn is able to flow without possibility of obstruction in the discharge with higher discharge outlet dimensions, being also recommended for flaked oat.

https://doi.org/10.1590/1809-4430-eng.agric.v37n4p627-636/2017 2294 downloads

14.

Mechanical properties of grain in silos for simulation designs
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Lopes Neto, José P.

; Nascimento, José W. B. do

; Marques, Jordânio I.

; Costa, Carlos A. da

Engenharia Agrícola

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 2016, Volume 36 N. 4 Pages 573 - 580

Abstract: En | Text: En | PDF: En

ABSTRACT For the calculation of silos structures it has been used new methods and computational tools that require mechanical properties knowledge that are still unknown for most storable materials, especially grains. In this context, we aimed to determine the mechanical properties of rice and beans grains with moisture contents of 10, 12, and 14% by applying four compressive loads (5, 10, 15 and 20). The determined mechanical properties were Poisson's ratio (ν), Modulus of Elasticity (E), and the dilatancy angle (ψ). The procedure consisted in the application of the load in compression cell, adapted from MOLENDA & STASIAK, aiming to simulate loading and unloading of silos. We observed that the Poisson's ratio calculated for both loading and unloading, presented higher values than the experimental values, with the increase of their moisture content; the experimental elastic modulus presented higher values than the calculated ones, and both increased their values with the increase of their moisture content; the dilatancy angle decreased with the increase of moisture content and compressive loads.

https://doi.org/10.1590/1809-4430-Eng.Agric.v36n4p573-580/2016 2018 downloads

15.

CLASSIFICAÇÃO DE ÁGUAS MINERAIS BASEADA EM IMAGENS DIGITAIS OBTIDAS POR SMARTPHONES
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Silva Neto, Gerson F.

; Fonseca, Alexandre

; Braga, Jez W. B.

Química Nova

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 2016, Volume 39 N. 7 Pages 876 - 881

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

This work describes a new procedure for classification of mineral waters based on digital images acquired by smartphones. Commercial waters from eight mineral springs plus distilled water and tap water were combined with eriochrome T black or murexide and transferred to a cuvette, which was positioned into a light controlled chamber. RGB (Red, Blue and Green) measurements of cuvette images were acquired in real time, using a free smartphone app, and employed as variables for the exploratory analysis. 2D data dispersion along component B for murexide (x axis) and component R for eriochrome T black (y axis) provides the clear visualization of clusters using the raw variables. Hierarchical cluster analysis (HCA) applied to this data confirmed the efficient discrimination of samples providing the characterization of nine clusters for the ten classes of water investigated. The classification of samples based on a k-nearest neighbors (k-NN) modelled to the efficiency rate of 100% for 8 classes and of 94.4% and 50% for the remaining classes, respectively, indicating the adequate performance of the proposed strategy. Considering the facilities to acquire the data, such as low cost instrumentation and reagents, and the rapidity of the procedures, this alternative may be applied for verification of commercial water adulteration.

https://doi.org/10.5935/0100-4042.20160088 1420 downloads

Showing

itens per page

Page of 3 Next

Select one or more results

All Alphabetic

Results

Comparative chart Download CSV

Statistics of

Send result

To*

Use ; (semicolon) to insert more emails.

Send to email

This page

Selected records

All references (max. 300)

Your email

Subject

Comments

Export format:

RIS (for EndNote, ProCite, Reference Manager, RefWorks, Citavi, etc.)

BibTeX

Citation

CSV (for Excel, etc)

Export:

This page

Selected itens

All references (max. 2000)

Sem resultados

No documents were found for your search

Glossary and search help

You can enrich your search in a very simple way. Use the search indexes combined with the connectors (AND or OR) and specify more your search.

For example, if you want to search for articles about
cases of dengue in Brasil in 2015, use:
ti:dengue and publication_year:2015 and aff_country:Brasil

See below the complete list of search indexes that can be used:

Index code	Element
ti	article title
au	author
kw	article keywords
subject	subject (title words, abstract and keywords)
ab	abstract
ta	journal short title (e.g. Cad. Saúde Pública)
journal_title	journal full title (e.g. Cadernos de Saúde Pública)
la	publication language code (e.g. pt - Portuguese, es - Spanish)
type	document type
pid	publication identifier
publication_year	publication year of publication
sponsor	sponsor
aff_country	country code of the author's affiliation
aff_institution	author affiliation institution
volume	article volume
issue	article issue
elocation	elocation
doi	DOI number
issn	journal ISSN
in	SciELO colection code (e.g. scl - Brasil, col - Colômbia)
use_license	article usage license code

SciELO - Scientific Electronic Library Online
Rua Dr. Diogo de Faria, 1087 – 9º andar – Vila Clementino 04037-003 São Paulo/SP - Brasil
Email: scielo@scielo.org

All the contents of this site www.scielo.br, except where otherwise noted, is licensed under a Creative Commons Attribution License.
more »