Fábio Venturoli

Análise de fatores ambientais em marcenarias no Distrito Federal

Esta pesquisa foi realizada em marcenarias localizadas no Distrito Federal cujo objetivo foi analisar a exposicao dos trabalhadores de marcenarias aos fatores ambientais como conforto termico e iluminância, e fornecer subsidios para uma organizacao ou reorganizacao ergonomica do trabalho, visando a melhoria da saude, seguranca, bem-estar, conforto, satisfacao, qualidade e produtividade do trabalho. As maquinas escolhidas para a analise foram serra circular esquadrejadeira, tupia, desempenadeira, furadeira horizontal e lixadeira de cinta. Os dados foram coletados ao longo da jornada de trabalho pelas medicoes do Indice de Bulbo Umido e Termometro de Globo (Indice de Bulbo Umido e Termometro de Globo) e de iluminância do ambiente de trabalho. Realizaram-se analises de variâncias para verificar se houve diferencas significativas entre os valores coletados. Os resultados indicaram que o IBUTG medio encontrado nas empresas foi de 21,4 °C, o que permite um trabalho continuo durante as 8 h da jornada, segundo a NR 15. Alguns postos de trabalho apresentaram deficiencias com relacao a iluminância, segundo a NBR 5413/92, tupia (467 LUX) e furadeira horizontal (390 LUX) na empresa 2, serra circular esquadrejadeira (179 LUX) e lixadeira de cinta (172 LUX) na empresa 3 e tupia (339 LUX) na empresa 4.

Avaliação temporal da regeneração natural em uma floresta estacional semidecídua secundária, em Pirenópolis, Goiás

The natural regeneration in forest environments is dynamic, variable in space and time and it is in the development cycle of forests. In seasonal tropical forests, due to seasonal climatic changes, natural regeneration depends mainly on availability of soil moisture, which affects patterns of seed production and germination, survival and development of seedling as well. The objective of this study was to analyze the dynamics of natural regeneration in a seasonal semideciduous secondary forest in Pirenopolis, Goias, Brazil, by analyzing the changes in floristic composition of seedlings and small trees over time and relating them to environmental factors of plots in the study area by using Canonical Correspondence Analysis (CCA). The results indicated that seedlings were more dynamic than small trees mainly because of climate. This occurred because of the greater susceptibility of the seedling to soil water stress and the increase of solar radiation and temperature in the dry season. It was found a high floristic similarity (± 50%) among population of natural regeneration and the tree community, indicating an advanced stage of natural regeneration of the forest, with Diversity Index higher than 3.0 nats.indv-1. Canonical Correspondence Analysis grouped the species according to the environmental gradient of moisture and shade versus soil cover, placing near to each other, species of humid environments versus species of typical cerrado dry environments.

TREE DIAMETER GROWTH FOLLOWING SILVICULTURAL TREATMENTS IN A SEMI-DECIDUOUS SECONDARY FOREST IN CENTRAL BRAZIL

In the Cerrado biome of Brazil, savannas and dry forests are intimately linked and form mosaics. These forests are composed of species of high commercial value, well accepted in the timber market, which causes intensive deforestation on the remaining vegetation. Thus, the management of these forests is an important alternative to reduce deforestation in the remaining vegetation. The objective of this study was to analyze the response of tree species in relation to silvicultural treatments of competition and liana cutting in a semi-deciduous forest in Central Brazil. The results showed that community basal area increased 24% over 4.8 years and the median periodic annual increment in diameter was about 20% higher in plots with silvicultural treatments: 2.9 mm.yr-1 in the control compared to 3.2 mm.yr-1 to 3.6 mm.yr-1 between treatments. This study demonstrated that it is possible to increase the rates of radial growth through silvicultural techniques.

Regime de luz em uma floresta estacional semidecídua sob manejo, em Pirenópolis, Goiás

This study was carried out on a fragment of semi-deciduous forest in Pirenopolis, Goias, Brazil and investigated the changes in the photon flux density in relation to silvicultural interventions that aimed at increasing growth of tree species but without allowing invasion by exotic species that could influence the dynamics of natural regeneration. The design was a randomized block in factorial, testing the differences between silvicultural treatments, seasons and heights in the understory (1.30 m versus at the ground level). We tested two intensities of selective cutting of individual trees and vines in the forest. The treatments were sufficient to alter the understory light, both in the dry season and rainy season, in agreement with the hypothesis tested. The shading in the control area was 97% in the rainy season and 86% in the dry season, showing significant differences with the shading associated with silvicultural treatments, which ranged from 93% to 94% in the rainy season and from 77% to 80% in the dry season. This study may assist this forest management system for semi-deciduous forests in Central Brazil, and should be linked to population studies and community, preserving the forest fragments found in the region and generating numerous environmental benefits and extra income for the rural population.

Avaliação do nível de ruído em marcenarias no Distrito Federal, Brasil

This research was carried out in a carpentry in the Federal District, Brazil, with the objective to evaluate and to compare the noise level emitted by the machines used in the manufacture of furniture in four establishments. The evaluation was made with the one noise level measured and it was located as to ear of the worker while operating the machine as per NR15 norm. Six machines were evaluated. The statistical analysis was done using factorial design and mean test. The results indicated significant differences at 5% probability level among machines in the four companies. The mean noise level was of 92,16 dB(A). The highest value was found in the buzz saw in company 4 (101 dB(A)). The horizontal wimble was the only machine in all the companies that fitted with in the limits allowed in the NR15 norm (85 dB(A)) for a daily working of 8 hours. The other machines presented problems related to the noise emission.

Morphoagronomic Characterization of Tomato Plants and Fruit: A Multivariate Approach

Consumers in the fresh fruit market choose fruits mainly following criteria related to the external appearance. However, the introduction of new material for planting depends on the productive capacity of the plant as well as on the formation of fruit that meets consumer desires. Given the above, the objective of this study was to morphoagronomically characterize tomato genotypes using multivariate statistics. The genotype seedlings (Ellus, Black Mauri, Green Zebra, Green Tomato, Pomodoro Marmande, Pomodoro Fiorentino, Pitanga, and Black Krim) were transplanted 30 days after sowing. The morphoagronomic characterization of the genotypes was carried out by evaluating plants and fruits. The data were analyzed using descriptive analysis, namely, position and variability measurements. In addition, a multivariate cluster analysis and a principal component analysis were carried out for plant and fruit attributes. The cluster and principal component analyses were efficient in characterizing plants and/or fruits of different tomato genotypes. Such efficiency enhances result interpretation and proposed inferences, with applied relevance for the producers. The genotype Ellus has a combination of morphoagronomic plant and fruit traits superior to other genotypes. Such superior traits enable a high productivity.

Arborização urbana para mitigação das condições microclimáticas em Goiânia, Goiás

Urban trees can influence from landscape factors to microclimatic, affecting human well-being. This study had as objective to characterize two different sectors in Goiânia, Goias, Brazil and to verify how urban trees influence the microclimate. Two different areas, 1 km long each one, in two avenues from the city (Goias Av. and Planicie Av.). In each area, a census from all trees was conducted and the following variables were measured: temperature (oC), relative humidity (%), wind speed (km/h) and light intensity (lux). Descriptive analysis with absolute and relative frequency of tree species, Mann-Whitney (95%) test for comparing abundance among species, T Test (95%) for microclimate variables comparison among full sun and shaded areas in each one of the avenues and the last procedures were a principal components analysis (PCA) and a correspondence analysis (CCA) to verify the influence of environmental variables between full light and shaded areas. In areas shaded by trees crowns, temperatures, light intensity and wind speed showed lower values than shaded areas, while relative humidity showed higher values in these environments than in places without trees. Urban trees contribute to microclimatic conditions improvement in urban landscapes, positively influencing human well-being in urban centers.