9-Curva de graus dia acumulados comparada com desenvolvi mento do colmo das variedades CB 47-355;... more 9-Curva de graus dia acumulados comparada com desenvolvi mento do colmo das variedades CB 47-355; CB 40-13;
9-Curva de graus dia acumulados comparada com desenvolvi mento do colmo das variedades CB 47-355;... more 9-Curva de graus dia acumulados comparada com desenvolvi mento do colmo das variedades CB 47-355; CB 40-13;
Current Approaches in Science and Technology Research Vol. 5, 2021
The Stolf impact penetrometer is a dynamic cone penetrometer to measure soil resistance that has ... more The Stolf impact penetrometer is a dynamic cone penetrometer to measure soil resistance that has been used since its release in 1982. A centimeter-scale to measure penetration depth was engraved on the penetration steel rod in the original design. The idea was to make the equipment easier to understand for farmers and allow direct readings on the penetration rod and avoid additional parts. This study aimed to incorporate a millimeter-scale ruler to enable the operator to read the depth at eye level, avoiding crouching and increasing the reading accuracy. The equipment use and reset procedure of the depth reading (zero) were described in detail and illustrated. The original equipment with reading on the rod and the proposed equipment, with reading on the ruler, were compared in terms of the resistance values and sampling time in a soil profile. A significant difference (t-test, 1%) was found, resulting, on average, in 21% less time spent for readings on the ruler. Besides increasing the reading accuracy and reducing the sampling time, the users preferred the new design due to its higher comfort, which was finally incorporated into the commercial model. A retrospective of the technical development of the penetrometer is presented, and this study represents the first design modification, which has remained unaltered for 30 years.
The transposition of the São Francisco River is considered one of the greatest engineering works ... more The transposition of the São Francisco River is considered one of the greatest engineering works in Brazil of all time since it will cross an extensive agricultural region of continental dimensions, involving environmental impacts, water, soil, irrigation, water payment and other multidisciplinary themes. Taking into account its importance, this subject was incorporated into a discipline of UFSCar (Federal University of São Carlos - Brazil) named "Pollution and Environmental Impacts". It was noted strong reaction against the project, even before the presentation. To allow a critical analysis, the first objective was to compile the main technical data and environmental impacts. The second objective was to detect the three most important aspects that cause reaction, concluding for the following reasons: assumption that the volume of water to be transferred was much greater than it actually is proposed in the project; lack of knowledge about similar project already done in Br...
O penetrômetro de impacto Stolf, em uso desde o seu lançamento em 1982, é um aparelho para medida... more O penetrômetro de impacto Stolf, em uso desde o seu lançamento em 1982, é um aparelho para medida da resistência do solo, tipo dinâmico. No projeto original, uma escala centimétrica, de profundidade, foi gravada na própria haste de penetração. O objetivo desse procedimento, na época, foi facilitar o entendimento pelos agricultores e permitir a leitura direta na haste de penetração, além de evitar peças adicionais. O objetivo do presente estudo foi incorporar ao projeto original uma régua em escala milimétrica, a fim de trazer a leitura da profundidade ao nível da visão do operador, evitando o agachamento, e aumentar a precisão da leitura. A utilização do equipamento e o procedimento para posicionar o zero da escala são descritos e esquematizados. Foi realizada comparação entre o equipamento original, com leitura na haste, e o equipamento proposto, com leitura na régua, avaliando-se quanto aos valores da resistência determinados e ao tempo de execução de um perfil de solo. A utilizaç...
9-Curva de graus dia acumulados comparada com desenvolvi mento do colmo das variedades CB 47-355;... more 9-Curva de graus dia acumulados comparada com desenvolvi mento do colmo das variedades CB 47-355; CB 40-13;
9-Curva de graus dia acumulados comparada com desenvolvi mento do colmo das variedades CB 47-355;... more 9-Curva de graus dia acumulados comparada com desenvolvi mento do colmo das variedades CB 47-355; CB 40-13;
Current Approaches in Science and Technology Research Vol. 5, 2021
The Stolf impact penetrometer is a dynamic cone penetrometer to measure soil resistance that has ... more The Stolf impact penetrometer is a dynamic cone penetrometer to measure soil resistance that has been used since its release in 1982. A centimeter-scale to measure penetration depth was engraved on the penetration steel rod in the original design. The idea was to make the equipment easier to understand for farmers and allow direct readings on the penetration rod and avoid additional parts. This study aimed to incorporate a millimeter-scale ruler to enable the operator to read the depth at eye level, avoiding crouching and increasing the reading accuracy. The equipment use and reset procedure of the depth reading (zero) were described in detail and illustrated. The original equipment with reading on the rod and the proposed equipment, with reading on the ruler, were compared in terms of the resistance values and sampling time in a soil profile. A significant difference (t-test, 1%) was found, resulting, on average, in 21% less time spent for readings on the ruler. Besides increasing the reading accuracy and reducing the sampling time, the users preferred the new design due to its higher comfort, which was finally incorporated into the commercial model. A retrospective of the technical development of the penetrometer is presented, and this study represents the first design modification, which has remained unaltered for 30 years.
The transposition of the São Francisco River is considered one of the greatest engineering works ... more The transposition of the São Francisco River is considered one of the greatest engineering works in Brazil of all time since it will cross an extensive agricultural region of continental dimensions, involving environmental impacts, water, soil, irrigation, water payment and other multidisciplinary themes. Taking into account its importance, this subject was incorporated into a discipline of UFSCar (Federal University of São Carlos - Brazil) named "Pollution and Environmental Impacts". It was noted strong reaction against the project, even before the presentation. To allow a critical analysis, the first objective was to compile the main technical data and environmental impacts. The second objective was to detect the three most important aspects that cause reaction, concluding for the following reasons: assumption that the volume of water to be transferred was much greater than it actually is proposed in the project; lack of knowledge about similar project already done in Br...
O penetrômetro de impacto Stolf, em uso desde o seu lançamento em 1982, é um aparelho para medida... more O penetrômetro de impacto Stolf, em uso desde o seu lançamento em 1982, é um aparelho para medida da resistência do solo, tipo dinâmico. No projeto original, uma escala centimétrica, de profundidade, foi gravada na própria haste de penetração. O objetivo desse procedimento, na época, foi facilitar o entendimento pelos agricultores e permitir a leitura direta na haste de penetração, além de evitar peças adicionais. O objetivo do presente estudo foi incorporar ao projeto original uma régua em escala milimétrica, a fim de trazer a leitura da profundidade ao nível da visão do operador, evitando o agachamento, e aumentar a precisão da leitura. A utilização do equipamento e o procedimento para posicionar o zero da escala são descritos e esquematizados. Foi realizada comparação entre o equipamento original, com leitura na haste, e o equipamento proposto, com leitura na régua, avaliando-se quanto aos valores da resistência determinados e ao tempo de execução de um perfil de solo. A utilizaç...
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