A instrução pública na França revolucionária: considerações a partir do Essais Sur L'enseignement En General Et Sur Celui Des Mathématiques En Particulier, de Sylvestre-François Lacroix

L'article présente le livre Essais sur l'enseignement en général, et sur celui des mathématiques en particulier de Sylvestre-François Lacroix, à l'origine publié en France en 1805, mettant l'accent sur sa première partie, dans lequel l'auteur traite de l'instruction publique, et en particulier des écoles centrales crées pendant la Revolution Française pour remplacer des colléges et des facultés des arts des anciennes universités.

Desempenho de tractores florestais processadores

A time-and-motion study in wood processing of the Eucalyptus harvester's operational cycle was developed. The objective was to evaluate wood harvesters working under several site conditions. The research includes two kinds of harvesters while processing wood to supply paper and cellulose factories, as follows: a machine with twin tires and other one with large tracks, both connected to a different head harvester models. The forestry species were Eucalyptus saligna Smith and Eucalyptus grandis Hill ex Maiden, seven and eight years old, in slope terrains ranging from 0% to 10% degrees, under harvesting systems used by Votorantim and Suzano forestry companies, in São Paulo State, Brazi. Considering all field research, results disclosed that, for some conditions, both machines have shown mathematical correlation between some mechanical wood operation within the processing operational cycle and the saw logs production. All the mathematical correlations were found to express logarithmical models.