Navegando por Autor "Oliveira Júnior, Geraldo Gomes de"

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Levantamento de emissão de gases de efeito estufa pela metodologia do carbono equivalente na cultura do cafeeiro
(Editora UFLA, 2015-10) Oliveira Júnior, Geraldo Gomes de; Silva, Adriano Bortolotti da; Mantovani, José Ricardo; Miranda, José Messias; Florentino, Ligiane Aparecida
A cultura do cafeeiro é uma das principais atividades do sul de Minas Gerais. Na produção do café ocorrem emissões de gases de efeito estufa (GEE) de diferentes fontes. A realização de um Inventário de Emissões de GEE é fundamental para que uma propriedade cafeeira possa avaliar como as suas atividades impactam o meio ambiente em relação a estas emissões. Objetivou-se, no presente trabalho, identificar, inventariar e quantificar as principais fontes emissoras de GEE na cultura do café, no sul de Minas Gerais, e convertê-las em carbono equivalente (CO2 eq), por hectare. O inventário foi realizado utilizando-se parâmetros do GHG Protocol, Ministério da Ciência e Tecnologia e dados do IPCC. O inventário demonstrou que os principais GEE gerados na cafeicultura corresponderam a 2,13 tCO2 eq ha-1 , sendo que o consumo de adubos nitrogenados contribuiu com 1,01 tCO2 eq ha-1 (47,5%), o calcário com 0,65 tCO2 eq ha-1 (30,8%), os combustíveis fósseis com 0,35 tCO2 eq ha-1 (16,9%), o GLP residencial 0,049 tCO2 eq ha-1 (2,3%) e o consumo de energia elétrica 0,050 tCO2 eq ha-1 (2,4%).
Occupational exposure to localized vibrations using portable mechanical brush cutter in coffee crop
(Editora UFLA, 2019-04) Oliveira Júnior, Geraldo Gomes de; Silva, Adriano Bortolotti da; Cunha, Irlon de Ângelo da; Aparecido, Lucas Eduardo de Oliveira; Sabino, Paulo Henrique de Siqueira
The use of portable brush cutter may expose workers to localized vibrations, from the transfer of mechanical vibration of the tool to the operator’s hands and arms. With this in mind, the objective in this study was to quantify the levels of occupational vibration transmitted to the hands and arms of the portable brush cutter operators under routine working conditions in the coffee crop. The vibration levels transmitted to the operator’s hands were measured during activity with portable brush cutters. The experimental design was completely randomized (CRD) in a factorial scheme (2 x 2) combined with two types of grip (Circular cable (CC) and double grip handle (DGH) with two types of tip cutting blades (2TB and 3TB). The data acquisition occurred from the use of the vibration meter SV 103, SVANTEK with triaxial accelerometer, installed on each of the worker’s hand at the contact point with the tool. The results demonstrated that the 2.5 ms -2 action level determined by NR 09 and NHO 10 was exceeded under all conditions of the present study. The highest accelerations were quantified in the operation of the brush cutter equipment with CC, reaching the daily exposure limit of 5 ms -2 allowed for an 8-hour of working day. The resulting acceleration of the DGH equipment was on average 37.45% lower than the operation with the CC equipment. The results bring indicatives of occupational advantages in the selection of these types of accessories for brush cutters, in order to mitigate the effects of exposure to HAV in extended use situations.
Occupational noise level emitted by self-propelled harvesters during mechanized coffee harvesting
(Universidade Federal de Santa Maria, 2022-08-29) Martins, Kleber Moreira; Sabino, Paulo Henrique de Siqueira; Silva, Adriano Bortolotti da; Oliveira Júnior, Geraldo Gomes de; Ramirio, Lucas Deleon
This study evaluated the level of occupational noise emitted by automotive harvesters during coffee harvest. For the evaluations, three self-propelled harvesters were used: Case-IH® model Coffee Express 200, with cabin; Korvan® model 9200, without cabin; and Oxbo® model 9220, with cabin. Data were collected using a noise dosimeter model DOS-700. Noise levels were assessed for the operator and assistant of each harvester. Five repetitions were performed for the operator and assistant, with each repetition consisting of 2 h of evaluation. Results obtained were compared with the action level and exposure limit of the Regulatory Norms (NR) 15 and Occupational Hygiene Norms (NHO) 01. The action levels of the NHO 01 (82 dB) and NR 15 (80 dB) regulations were exceeded for the operator and assistant in the three evaluated harvesters. Regarding the exposure limit (85 dB), the level was exceeded for the operator of the Korvan® and Case-IH® harvesters in accordance with NHO 01. In the NR 15 regulation, the exposure limit was > 85 dB for the operator of the Korvan® harvester. For the assistant, all harvesters emitted noise levels > 85 dB based on both the NHO 01 and NR 15 regulations.
Occupational noise level in mechanized and semimecanized harvest of coffee fruits
(Editora UFLA, 2018-10) Silva, José Antonio Ramos da; Oliveira Júnior, Geraldo Gomes de; Costa, Carlos Emanuel de Melo; Silva, Adriano Bortolotti da; Gabriel, Camila Pires Cremasco; Putti, Fernando Ferrari
Coffee cultivation has undergone significant changes, especially with regard to the mechanization process of the various existing operations that were previously carried out manually by the workers. It is observed that the intensification of mechanized activities can expose workers to noise levels capable of compromising their hearing health. In this sense, the objective in the present study was to determine the level of occupational noise in the activities of mechanized and semi- mechanized harvesting of coffee fruits and compare them with the limits of tolerance of the current legislation. The occupational noise level was determined considering the exposure of homogeneous groups, using an integrative meter for personal use, noise dosimeter, electromechanically calibrated and with field calibration. The results demonstrate that the noise levels found are above the limits allowed for an 8-hour working day. The highest observed level was 100.7 dB (A) in the sweeping operation with the blower equipment and the lowest level 89.0 dB (A) in the auxiliary activity of the selected collection equipment Vicon H3000. Harvesting activity with a portable mechanical stripper equipment showed a noise level 4.2% higher compared to harvesting with automotive harvester equipment.
Octave band sound pressure level emitted by agricultural implements in coffee plantations
(Universidade Federal de Santa Maria, 2024-02-23) Anderson, Carlos Guida; Sabino, Paulo Henrique de Siqueira; Oliveira Júnior, Geraldo Gomes de; Silva, Gian Otávio Alves da
In Brazil, certain studies have been performed on the exposure to global occupational noise levels when mechanized equipment is used in coffee-growing. However, these did not indicate the behavior within a frequency spectrum (Hz) by octave bands. The objective of this study was to assess the sound pressure levels of the brush, mower, and atomizer attached to a tractor under actual operating conditions by using 1/1 octave band filters. Quantitative assessments were performed with the mower, brush, and atomizer attached to the MF 275 tractor under two conditions: operative and static. The noise levels obtained under actual operating conditions were determined using a DOS 1000 noise dosimeter and an octave band filter. The static condition assessments were performed inside and outside the coffee plantation using a Hikari HDB 900 digital sound level meter. The NR 15 and NHO 01 standards were used to analyze the data. Under operative and static conditions, the tractor units showed noise levels above the exposure limit of 85 dB (A) for an 8h working day. The assessment of the frequency spectrum revealed the highest noise levels to be in the 125-1000 Hz range.
Workers’ exposure to occupational heat during manual coffee harvesting
(Universidade Federal de Santa Maria, 2021) Ramirio, Lucas Deleon; Sabino, Paulo Henrique de Siqueira; Oliveira Júnior, Geraldo Gomes de; Silva, Adriano Bortolotti da
This study evaluated the occupational exposure of workers to heat during manual harvesting of coffee. The case study was conducted between May to August. Occupational heat in coffee plantations was evaluated using the Wet Bulb Globe Temperature (WBGT) method and the metabolic rate. The WBGT was obtained using the TGD 400 thermal stress meter. The determined WBGT values were compared to two standards: the Occupational Hygiene Standard (NHO) 06 and Regulatory Norm (NR) 09. For acclimatized workers, the exposure limit was not exceeded at any time during the evaluated period. Fornon-acclimatized workers, the exposure limit was not exceeded only in July.