RESUMO O consórcio de sorgo granífero com braquiária proporciona a produção de grãos e massa seca na entressafra; contudo, há carência de informações relacionadas à implantação dessas espécies. Sendo assim, este trabalho teve por objetivo identificar a melhor associação de sorgo granífero e braquiária na segunda safra para produção de grãos e massa seca na região do Cerrado. O experimento foi conduzido em Rio Verde, Goiás, no delineamento experimental de blocos randomizados, em esquema fatorial 2×3×4+5, com quatro repetições. Foram avaliados dois híbridos de sorgo granífero (BRS 330 e DKB 551) associados a três espécies de Brachiaria (Brachiaria brizantha cultivar Marandu, Brachiaria decumbens e Brachiaria ruziziensis) em quatro sistemas de implantação da braquiária (linha, entrelinha, linha + entrelinha do sorgo e a lanço). Os tratamentos adicionais referiam-se aos dois monocultivos de sorgo e às três espécies de braquiária. O consórcio de sorgo com braquiária ocasionou redução no rendimento de grãos, porém os sistemas de implantação da braquiária na linha, entrelinha e a lanço foram os mais promissores. O híbrido de sorgo DKB 551 foi o mais sensível à competição com a braquiária, sem, contudo, haver diferenças de rendimento de grãos em consórcio. Os consórcios das braquiárias na entrelinha e na linha + entrelinha, principalmente com a B. ruziziensis, foram os mais promissores para produção de massa seca e proteína bruta total. O cultivo de braquiária com o sorgo proporcionou maior aporte de massa seca na entressafra, fato importante para o sistema de plantio direto nos sistemas de produção agrícola dos Cerrados.

ABSTRACT The grain sorghum intercropped with Brachiaria provides the production of grains and dry mass in the off-season; however, there is a lack of information related to the implantation of these species. The objective of this study was to identify the best association of sorghum and Brachiaria in the production of grain and dry matter in the Brazilian Cerrado region. The experiment was conducted in Rio Verde, State of Goiás, in the experimental design of randomized blocks, in a 2×3×4+5 factorial scheme, with four replications. Two sorghum hybrids (BRS 330 and DKB 551) associated to three Brachiaria species (Brachiaria brizantha cultivar Marandu, Brachiaria decumbens and Brachiaria ruziziensis) were evaluated in four systems of Brachiaria implantation (row, interrow, row + interrow of sorghum and spread). Additional treatments referred to the two sorghum monocrops and the three Brachiaria species. The sorghum and Brachiaria consortium resulted in a reduction in grain yield, but the Brachiaria implantation systems in the row, interrow and spread were the most promising. The sorghum hybrid DKB 551 was the most sensitive to the competition with Brachiaria, although there were no grain yield differences in the intercropping. The Brachiaria intercropped in the interrow and in the row + interrow, mainly with B. ruziziensis, were the most promising for the production of dry mass and total crude protein. The cultivation of Brachiaria intercropped with sorghum provided a greater contribution of dry mass in the off-season, an important fact for the no-tillage system in the agricultural production systems of the Brazilian Cerrado.

RESUMO Objetivo: analisar a associação entre sobrecarga de trabalho e comportamento de risco adotado por motociclistas. Método: estudo transversal com trabalhadores acidentados condutores de motocicletas, internados no Hospital da Restauração Governador Paulo Guerra no Recife-PE, no período de maio a setembro de 2016. Aplicou-se um questionário contendo variáveis sociodemográficas relacionadas à sobrecarga de trabalho e adoção de comportamentos de risco. Para análise da associação entre as variáveis, utilizou-se Odds Ratio (OR) e Intervalo de Confiança de 95%. Resultados: observou-se predomínio do sexo masculino (97,6%), com média de idade 31,44 anos (DP = 9,50). Houve associação de sono/fadiga no momento do acidente com dificuldades em realizar tarefas de trabalho (OR = 3,7), sentir-se cansado durante o trabalho (OR = 4,6) e sentir-se pressionado a realizar tarefas de trabalho (OR = 3,5). Conclusão: a sobrecarga de trabalho associou-se à adoção de comportamento de risco. Acredita-se que tal fato pode repercutir na ocorrência e gravidade dos acidentes.

ABSTRACT Objective: to analyze the association between work overload and risk behaviors adopted by motorcyclists. Method: a cross-sectional study of injured motorcycle drivers hospitalized at the Hospital da Restauração Governador Paulo Guerra in the city of Recife, PE, from May to September 2016. A questionnaire was applied containing sociodemographic variables related to work overload and risk behaviors adoption. Odds Ratio (OR) and 95% Confidence Interval were used to analyze the association between the variables. Results: there was a predominance of males (97.6%), mean age 31.44 years (SD = 9.50). There was an association of sleep/fatigue at the accident time with difficulties carrying out work tasks (OR = 3.7), feeling tired during work (OR = 4.6) and feeling under pressure to carry out work tasks (OR = 3.5). Conclusion: work overload was associated with risk behaviors adoption. It is believed that this fact can have an impact on the occurrence and severity of accidents.

RESUMEN Objetivo: analizar la asociación entre sobrecarga de trabajo y comportamiento de riesgo adoptado por los motociclistas. Método: El estudio transversal con trabajadores accidentados conductores de motocicletas, internados en el Hospital da Restauração Governador Paulo Guerra en Recife-PE, en el período de mayo a septiembre de 2016. Se aplicó un cuestionario que contenía variables sociodemográficas relacionadas con la sobrecarga de trabajo y la adopción de comportamientos de riesgo. Para el análisis de la asociación entre las variables, se utilizó el Odds Ratio (OR) y el Intervalo de Confianza del 95%. Resultados: se observó predominio del sexo masculino (97,6%), con media de edad 31,44 años (DE = 9,50). Se observó una asociación de sueño/fatiga en el momento del accidente con dificultades en realizar tareas de trabajo (OR = 3,7), sentirse cansado durante el trabajo (OR = 4,6) y sentirse presionado a realizar tareas de trabajo (OR = 3,7) OR = 3,5). Conclusión: la sobrecarga de trabajo se asoció a la adopción de comportamiento de riesgo. Se cree que tal hecho puede repercutir en la ocurrencia y gravedad de los accidentes.

ABSTRACT Objective: to analyze the association between work overload and risk behaviors adopted by motorcyclists. Method: a cross-sectional study of injured motorcycle drivers hospitalized at the Hospital da Restauração Governador Paulo Guerra in the city of Recife, PE, from May to September 2016. A questionnaire was applied containing sociodemographic variables related to work overload and risk behaviors adoption. Odds Ratio (OR) and 95% Confidence Interval were used to analyze the association between the variables. Results: there was a predominance of males (97.6%), mean age 31.44 years (SD = 9.50). There was an association of sleep/fatigue at the accident time with difficulties carrying out work tasks (OR = 3.7), feeling tired during work (OR = 4.6) and feeling under pressure to carry out work tasks (OR = 3.5). Conclusion: work overload was associated with risk behaviors adoption. It is believed that this fact can have an impact on the occurrence and severity of accidents.

RESUMEN Objetivo: analizar la asociación entre sobrecarga de trabajo y comportamiento de riesgo adoptado por los motociclistas. Método: El estudio transversal con trabajadores accidentados conductores de motocicletas, internados en el Hospital da Restauração Governador Paulo Guerra en Recife-PE, en el período de mayo a septiembre de 2016. Se aplicó un cuestionario que contenía variables sociodemográficas relacionadas con la sobrecarga de trabajo y la adopción de comportamientos de riesgo. Para el análisis de la asociación entre las variables, se utilizó el Odds Ratio (OR) y el Intervalo de Confianza del 95%. Resultados: se observó predominio del sexo masculino (97,6%), con media de edad 31,44 años (DE = 9,50). Se observó una asociación de sueño/fatiga en el momento del accidente con dificultades en realizar tareas de trabajo (OR = 3,7), sentirse cansado durante el trabajo (OR = 4,6) y sentirse presionado a realizar tareas de trabajo (OR = 3,7) OR = 3,5). Conclusión: la sobrecarga de trabajo se asoció a la adopción de comportamiento de riesgo. Se cree que tal hecho puede repercutir en la ocurrencia y gravedad de los accidentes.

RESUMO Objetivo: analisar a associação entre sobrecarga de trabalho e comportamento de risco adotado por motociclistas. Método: estudo transversal com trabalhadores acidentados condutores de motocicletas, internados no Hospital da Restauração Governador Paulo Guerra no Recife-PE, no período de maio a setembro de 2016. Aplicou-se um questionário contendo variáveis sociodemográficas relacionadas à sobrecarga de trabalho e adoção de comportamentos de risco. Para análise da associação entre as variáveis, utilizou-se Odds Ratio (OR) e Intervalo de Confiança de 95%. Resultados: observou-se predomínio do sexo masculino (97,6%), com média de idade 31,44 anos (DP = 9,50). Houve associação de sono/fadiga no momento do acidente com dificuldades em realizar tarefas de trabalho (OR = 3,7), sentir-se cansado durante o trabalho (OR = 4,6) e sentir-se pressionado a realizar tarefas de trabalho (OR = 3,5). Conclusão: a sobrecarga de trabalho associou-se à adoção de comportamento de risco. Acredita-se que tal fato pode repercutir na ocorrência e gravidade dos acidentes.

ABSTRACT. The productive capacity of soybeans is associated with the adaptation of the culture to the cultivation environment. Factors such as a high number of pods, the weight of a thousand grains, and grain number are essential factors in determining cultivars of high productive potential. The launching of new varieties associated with new technologies makes it necessary to know the performance of these varieties in different growing environments. This study aimed to analyze the agronomic performance of transgenic soybean cultivars under Cerrado conditions. The experimental design used completely randomized blocks; six of the twelve cultivars used RR1 technology and the remaining six used RR2BT. The cultivars were grown in five distinct locations in the southwest region of Goiás. The results demonstrated no increments in the grain yield of the RR1 or RR2BT technologies and the precocity of the cultivars also did not favor an increase in grain yield. The localities of Jataí and Rio Verde did not influence the cultivar cycle.

ABSTRACT Nanotechnology can significantly improve the mechanical strength and durability of concrete. At the nanoscale, good dispersion of constituent materials is an essential factor for the improvement of concrete properties. In this scenario, the objective of this research was to evaluate the mechanical properties of high performance concrete containing stabilized nano-silica. The incorporation of nano-silica to the polycarboxylate chemical admixture allowed its application in concrete, since the nano-silica was evenly dispersed in the concrete mass. For this study, three different concretes were employed: a reference concrete, one containing stabilized nano-silica and another containing a mixture of silica fume and stabilized nano-silica. The evaluated concrete mechanical properties were the axial compressive strength and secant modulus of elasticity measured in three different ages. The results indicated a substantial increase in concrete compressive strength and modulus of elasticity with the addition of stabilized nano-silica combined with a reduction in cement content. The results also showed that use of stabilized nano-silica proved to be very advantageous, especially when mixed with silica fume. When they were combined, a synergy effect occurred in the concrete that was of chemical nature in addition to the physical effect of better concrete particle packaging. Analysis by scanning electron microscopy showed the improvement in microstructure of concretes with stabilized nano-silica, which contributed to gains in mechanical properties.

ABSTRACT Objective: To determine the knowledge of Brazilian Orthopedic Surgeons on the costs of orthopedic surgical devices used in surgical implants . Methods: A questionnaire was applied to Brazilian Orthopedic Surgeons during the 46th Brazilian Congress on Orthopedics and Traumatology . Results: Two hundred and one Orthopedic Surgeons completely filled out the questionnaire. The difference between the average prices estimated by the surgeons and the average prices provided by the supplier companies was 47.1%. No differences were found between the orthopedic specialists and other subspecialties on the prices indicated for specific orthopedic implants. However, differences were found among orthopedic surgeons who received visits from representatives of implant companies and those who did not receive those visits on prices indicated for shaver and radiofrequency device. Correlation was found between length of orthopedic experience and prices indicated for shaver and interference screw, and higher the experience time the lower the price indicated by Surgeons for these materials . Conclusion: The knowledge of Brazilian Orthopedic Surgeons on the costs of orthopedic implants is precarious. Reduction of cost of orthopedics materials depends on a more effective communication and interaction between doctors, hospitals and supplier companies with solid orientation programs and awareness for physicians about their importance in this scenario. Level of Evidence III, Cross-Sectional Study.

Visando reduzir as dificuldades do produtor no cultivo da alface americana, especificamente quanto à falta de informações técnicas sobre o momento oportuno de irrigar e a quantidade de água a ser aplicada economicamente viável, objetivou-se estudar o efeito de diferentes lâminas de água sobre o comportamento produtivo e econômico da alface americana. O experimento foi realizado na Universidade Federal de Lavras, no período de março a maio de 2008 em casa de vegetação. O delineamento experimental foi em blocos casualizados, com cinco tratamentos e quatro repetições. Os tratamentos foram constituídos de cinco fatores de evaporação, correspondentes a 0,30, 0,60, 0,90, 1,20 e 1,50 EVm, baseado na lâmina evaporada de um minitanque. Os resultados permitiram concluir que, a máxima produtividade total e comercial, 65.578 e 35.308 kg ha-1, foram estimadas com aplicação de lâminas equivalentes a 203,9 e 204,3 mm, respectivamente, correspondente ao fator de reposição de 101%. Considerando o preço do fator água (R$ 0,67 mm-1) e o preço da alface americana (R$ 0,90 kg-1), a lâmina economicamente ótima foi 203,9 mm, resultando em uma produtividade comercial praticamente igual à máxima física.

With the objective of minimize the difficulties faced by the producers on cultivating the crisphead lettuce, specifically those related with the lack of technical information regarding the ideal moment to irrigate and the amount of water to be applied, a study was performed in order to determine the effect of different water depths on production and economical behavior of crisphead lettuce. The experiment was carried out in a greenhouse of the Universidade Federal de Lavras, between March and May 2008. A randomized block design with five treatments and four replicates was applied. The treatments, consisted of five evaporation factors 0.30, 0.60, 0.90, 1.20 and 1.50 EVm, based on an evaporated depth of a reduced pan. The results showed that the maximum total and commercial yield, 65.578 and 35.308 kg ha-1, were estimated by applying depths equivalent to 203.9 and 204.3 mm, respectively, corresponding to 101% replacement factor. Considering the water factor price (R$ 0.67 mm-1) and crisphead lettuce price (R$ 0.90 kg-1), the economically optimum depth was 203.9 mm, which resulted in a commercial yield equal to a physical maximum.