Sample records for hourly variations
from WorldWideScience.org

Sample records 1 - 2 shown.



1

Desempenho operacional de um trator agrícola equipado alternadamente com pneus radiais e diagonais/ Operational performance of an agricultural tractor equipped alternately with radial and diagonal tires

Barbosa, Jackson A.; Vieira, Luciano B.; Dias, Gutemberg P.; Dias Júnior, Moacir de S.
2005-08-01

Resumo em português A utilização de pneu radial em tratores agrícolas na década de 1950 resultou em redução das perdas de potência oriundas da resistência ao rolamento e patinagem, com conseqüente melhoria no desenvolvimento da tração. Este trabalho teve como objetivo comparar o desempenho operacional de um trator agrícola equipado alternadamente com pneus radiais e diagonais. A avaliação foi realizada a partir de análises de parâmetros indicadores do desempenho dos referidos (mais) pneus sob condições específicas de trabalho. O uso de pneus radiais proporcionou incrementos nos valores de capacidade de tração e potência na barra, diminuição nos valores de consumo específico de combustível e não causou variações no consumo horário de combustível. Resumo em inglês The use of radial tire in agricultural tractors in the decade of 1950 resulted in the reduction of the potency losses originated from the rolling resistance and slippage, with consequent improvement in the traction development. This work had as objective to compare the operational performance of an agricultural tractor, equipped alternately with radial and diagonal tires. The evaluation was accomplished, starting from analyses of indicative parameters of the performance o (mais) f the referred tires under specific conditions of work. The use of radial tires provided increments in the values of traction capacity and drawbar pull, decrease in values of specific consumption of fuel, and didn't cause variations in the hourly consumption of fuel.

Scientific Electronic Library Online (Portuguese)

2

Calliphoridae (Diptera) em Manaus, Amazonas: II. Padrão de atividade de vôo em cinco espécies/ Calliphoridae (Diptera) in Manaus, Amazonas: II. Flight activity pattern in five species

Paraluppi, Norival D.; Castellón, Elóy G.
1993-01-01

Resumo em inglês Five species of calliphorid flies, Chrysomya megacephala (Fabricius, 1794), C. putoria (Wiedemann, 1830), C. albiceps (Wiedemann. 1819), Cochliomyia macellaria (Fabricius, 1775) and Phaenicia eximia (Wiedemann, 1819), were collected hourly belween 6:00 and 18:00h., during five consecutive days per month for 12 moths; using home-made traps baited with rotting bovine lung. The data were statisticaly analyzed with relation to precipitation, temperature, relative humidity and (mais) luminosity. The results indicate that precipitation must have acted upon the seasonal abundance of the species, and that these responded equally to temperature, relative humidity and luminosity, throughout the entire day, except for P. eximia, which exhibited greater sensibility to these factors, demonstrating greater activity during the morning hours. The geographic expansion of invader species, associated to the tolerance to climatic variations was briefily discussed.

Scientific Electronic Library Online (Portuguese)