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Brasília, Brazil

de Oliveira Mota L.H.d.S.,CAPES | Valladares G.S.,Federal University of Ceara
Revista Ciencia Agronomica | Year: 2011

This work aimed to prepare a map of soil degradation vulnerability in the Acaraú basin, Ceará, through the Geographic Information System and multicriterium additive methodology. For the obtaining of classes of vulnerability, we evaluated information related to geology, geomorphology, pedology, vegetation and climate, resulting in five classes: stable, moderately stable, medium stable/vulnerable, moderately vulnerable and vulnerable. The class medium stable/vulnerable was the most representative, occupying 9,776 km2 of extension (67.8 % of the basin), followed by the class moderately stable, which occupied 4,180 km2 of extension (more than 28% of the basin). The results showed the viability of the method for preparing the map of environmental vulnerability, which can be applied in the territorial management of the Acaraú basin.

de Andrade J.S.,State University of Southwest Bahia | Viana A.E.S.,State University of Southwest Bahia | Cardoso A.D.,CAPES | Matsumoto S.N.,State University of Southwest Bahia | de Novaes Q.S.,State University of Southwest Bahia
Revista Ciencia Agronomica | Year: 2011

This work was developed aiming the evaluation of pruning effect on yield and other agronomical characteristic of cassava. The experiment was carried out at the experimental area at Universidade Estadual do Sudoeste da Bahia, in Vitória da Conquista of the state of Bahia, using a randomized block design, with 13 experiments [1 treatment without pruning, and 12 pruning times, performed from June 2008 (213 days after planting) up to June 2009 (543 days after planting), with a 30-day-interval among the pruning). The following characteristics were evaluated: tuberous roots yield, dry mass percentage in tuberous roots, starch percentage in tuberous root, flour yield; flour production, steam. The results demonstrated that pruning adoption in cassava plants during physiologic rest (May to June) increase the production of roots, which tend to present more dry mass and flour yield, at the end of the cycle, the reduction, and reduction of the aerial part, during the pruning. If the pruning was performed during the higher vegetative growth, a higher productivity of the aerial part and lower productivity of the roots is obtained.

Herman J.P.,University of Cincinnati | Mcklveen J.M.,University of Cincinnati | Solomon M.B.,University of Cincinnati | Carvalho-Netto E.,CAPES | Myers B.,University of Cincinnati
Brazilian Journal of Medical and Biological Research | Year: 2012

The mammalian stress response is an integrated physiological and psychological reaction to real or perceived adversity. Glucocorticoids are an important component of this response, acting to redistribute energy resources to both optimize survival in the face of challenge and to restore homeostasis after the immediate challenge has subsided. Release of glucocorticoids is mediated by the hypothalamo-pituitary-adrenal (HPA) axis, driven by a neural signal originating in the paraventricular nucleus (PVN). Stress levels of glucocorticoids bind to glucocorticoid receptors in multiple body compartments, including the brain, and consequently have wide-reaching actions. For this reason, glucocorticoids serve a vital function in negative feedback inhibition of their own secretion. Negative feedback inhibition is mediated by a diverse collection of mechanisms, including fast, non-genomic feedback at the level of the PVN, stress-shut-off at the level of the limbic system, and attenuation of ascending excitatory input through destabilization of mRNAs encoding neuropeptide drivers of the HPA axis. In addition, there is evidence that glucocorticoids participate in stress activation via feed-forward mechanisms at the level of the amygdala. Feedback deficits are associated with numerous disease states, underscoring the necessity for adequate control of glucocorticoid homeostasis. Thus, rather than having a single, defined feedback 'switch', control of the stress response requires a wide-reaching feedback 'network' that coordinates HPA activity to suit the overall needs of multiple body systems.

Rudnick H.,University of Chile | Palma R.,University of Chile | Carneiro S.,CAPES | Assis T.M.L.,Federal University of Fluminense | And 2 more authors.
IEEE Power and Energy Magazine | Year: 2010

Electrical Engineering and Power Engineering are alive and well in Latin America. While IEEE and IEEE Power and Energy Society look for ways to entice high school students in the United States to go into engineering, the demand for engineering slots in Latin American universities grows every year, with the best students in those countries aiming for the profession. The challenge faced by the United States is that in a country of 309 million people, only 800 to 1,000 undergraduates interested in power engineering jobs graduate each year. Brazil, with a population of 192 million, graduates approximately 1,000 power engineers each year. Furthermore, U.S. enrollment in masters and doctoral programs in power engineering is around 550 per year for each, but roughly 60 of those graduates come from abroad and return to their countries after graduation. In contrast, Brazil trains 120 postgraduates in power engineering each year, and most stay in the country. © 2006 IEEE.

Siqueira J.D.M.,CAPES | Da Silva J.M.,INESC Porto | Do Paco T.A.,University of Lisbon
2015 Conference on Design of Circuits and Integrated Systems, DCIS 2015 | Year: 2015

The present work addresses the development of a smart orchard irrigation system (SOIS) that performs the estimation of orchard evapotranspiration and the estimation of the soil salinization risk. Measurements of heat transfer are made to compute tree transpiration rate and soil water evaporation. The soil electrical conductivity is measured to compute the soil salinization risk. An inferential fuzzy algorithm is used to process data. This paper describes the physical principles underlining these estimations, the architecture of the data acquisition interface, and the construction and characterization of the probes used to perform the temperature measurements. The preliminary results shown here address the experimental evaluation of the performance of the probes inserted in the trees. Relative measurements with a precision of 0.2 °C were obtained which are in agreement with the minimum required for these applications. © 2015 IEEE.

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