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| Gonçalves,Luana M.; Ferraz,Gabriel A. e S.; Oliveira,Marcelo S. de; Barbosa,Brenon D. S.; Silva,Carlos J. da; Ferraz,Patrícia F. P.. |
| ABSTRACT Noise is one of the harmful and stressful physical agents present in the workplace. Research performed with geostatistics to adjust the semivariogram of tractor noise were performed using the Gaussian and spherical model. In this way, the aim was to map the spatial variability of the noise emitted by a power tiller through the sine wave model, besides testing other fitting methods, in order to identify health zones for the workers. The experiment was performed with an agricultural power tiller (10.3 kW) placed in a working regime (1500 rpm), coupled to a brushcutter, and a digital sound level meter to collect noises in points distributed along a regular grid sampling of 2.0 × 2.0 m around the tractor. The spatial dependence of noise was analyzed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acoustic comfort; Agricultural mechanization; Spatial variability; Ergonomics; Sine wave model. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300223 |
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| Carvalho,Luis C. C.; Silva,Fabio M. da; Ferraz,Gabriel A. e S.; Stracieri,Juliana; Ferraz,Patrícia F. P.; Ambrosano,Lucas. |
| ABSTRACT To make the coffee activity competitive, some farmers use precision coffee farming. Thus, it is possible to create thematic maps that guide management practices for regions where there are limitation for the plant development. The objective of this study was to identify the spatial dependence of coffee crop yield, in 2012 and 2013. The experimental area is located in a Haplustox in Três Pontas, Minas Gerais. One hundred sampling points were georeferenced for the collection of yield data through manual harvest. The difference of yield between crop seasons was also evaluated. Data were processed using geostatistical analysis. It was possible to identify and characterize the spatial dependence of all variables, as well as to create contour maps.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica L.; Spatial variability; Biennuality; Maps; Precision agriculture. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000600410 |
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| Jacintho,João L.; Ferraz,Gabriel A. e S.; Silva,Fabio M. da; Santos,Sthéfany A.. |
| ABSTRACT This study aimed to apply precision agriculture techniques in coffee production, using correlation analysis in the definition of management zones. This work was carried out in a 22-ha area of coffee (Coffea arabica L.), cv. ‘Topázio MG 1190’, which was sampled on a regular grid, using a topographic GPS, totaling 64 georeferenced samples (on average, 2.9 points per ha). Descriptive analysis was used in the data, followed by Pearson’s correlation analysis at 0.05 significance between soil chemical attributes, agronomic characteristics of the plants and altitude. It was possible to verify the correlation of soil chemical attributes, agronomic characteristics of the plants and altitude with coffee yield. Altitude was the variable most correlated with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica L.; Precision agriculture; Yield; Thematic mapping. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000200094 |
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| Ferraz,Patrícia F. P.; Ferraz,Gabriel A. e S.; Damasceno,Flavio A.; Moura,Raquel S. de; Silva,Maria A. J. G.; Rodrigues,Rodrigo de L.. |
| ABSTRACT The profitability of a rabbit farming system must consider the rabbit’s breed, nutrition, management, sanitation and mainly the thermal environment that the animal will be exposed during the productive period. The aim of this study was to compare the internal thermal environment of two rabbit houses, one with ridge vent and the other without ridge vent. Geostatistical technique was used to evaluate the spatial variability of enthalpy. Data were collected at 48 points in each house during eight days at the end of summer season 2016. Measurements of dry-bulb temperature, relative humidity and wind speed were made for 1 min at three times a day at 7:00 a.m., 12:00 a.m. and 5:00 p.m. In addition, the enthalpy was calculated and a data analysis was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ambience; Welfare; Rabbit breeding; Geostatistics; Mapping. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000200126 |
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| Ferraz,Gabriel A. e S.; Silva,Fábio M. da; Oliveira,Marcelo S. de; Silva,Flavio C. da; Bueno,Rafael de L.. |
| O objetivo deste trabalho foi utilizar técnicas de georreferenciamento e de geoestatística para analisar a variabilidade espacial da força de desprendimento de frutos de cafeeiros por meio de semivariogramas e pela interpolação por krigagem. O trabalho foi conduzido no município de Três Pontas - MG, Brasil. A força de desprendimento dos frutos verdes e de cerejas dos cafeeiros foi obtida por meio de um protótipo de dinamômetro em pontos georreferenciados. A dependência espacial dos dados foi analisada por meio de ajustes de semivariogramas, clássico e robusto, para o método dos mínimos quadrados ordinários e ponderados, e apenas o ajuste clássico, para os métodos da máxima verossimilhança e máxima verossimilhança restrita. Testaram-se, para cada um dos... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Face de exposição solar; Agricultura de precisão; Geoestatística; Colheita mecanizada e seletiva; Café. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600016 |
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