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Belo Horizonte, Brazil

Trkman P.,University of Ljubljana | McCormack K.,DRK Research | De Oliveira M.P.V.,Federal University of Minas Gerais | De Oliveira M.P.V.,Centro Universitario | Ladeira M.B.,Federal University of Minas Gerais
Decision Support Systems | Year: 2010

The paper investigates the relationship between analytical capabilities in the plan, source, make and deliver area of the supply chain and its performance using information system support and business process orientation as moderators. Structural equation modeling employs a sample of 310 companies from different industries from the USA, Europe, Canada, Brazil and China. The findings suggest the existence of a statistically significant relationship between analytical capabilities and performance. The moderation effect of information systems support is considerably stronger than the effect of business process orientation. The results provide a better understanding of the areas where the impact of business analytics may be the strongest. © 2010 Elsevier B.V. All rights reserved. Source

Santos E.T.,Pontifical Catholic University of Minas Gerais | Zarate L.E.,Pontifical Catholic University of Minas Gerais | Pereira E.M.D.,Centro Universitario
Expert Systems with Applications | Year: 2013

Nowadays, the usage of systems based on solar energy have been largely stimulated. The correct designing and efficiency of these systems are highly dependent of the seasonal climatic characteristics of the regions where they will be installed. In this work, we propose a hybrid structure to simulate the thermodynamic behavior of pools, which uses neural computational models to incorporate the climatic information of the regions being analyzed. The neural models have as input variables data of geographic position such as: elevation, latitude and longitude, what permits to delineate the climatic profile of the region being considered. The human activity is another factor that directly influences the thermodynamic behavior of pools and, therefore, is also considered. In this work, changes of volume are estimated in order to track losses due to the human activity. © 2013 Elsevier B.V. All rights reserved. Source

Sperotto R.A.,Centro Universitario | Sperotto R.A.,Federal University of Rio Grande do Sul | Ricachenevsky F.K.,Federal University of Rio Grande do Sul | Waldow V.D.A.,Federal University of Rio Grande do Sul | Fett J.P.,Federal University of Rio Grande do Sul
Plant Science | Year: 2012

Rice and most staple cereals contain low iron (Fe) levels, most of which is lost during grain processing. Populations with monotonous diets consisting mainly of cereals are especially prone to Fe deficiency, which affects about two billion people. Supplementation or food fortification programs have not always been successful. Crop Fe fertilization is also not very effective due to Fe soil insolubility. An alternative solution is Fe biofortification by generating cultivars that efficiently mobilize, uptake and translocate Fe to the edible parts. Here, we review the strategies used for the Fe biofortification of rice, including conventional breeding and directed genetic modification, which offer the most rapid way to develop Fe-rich rice plants. While classical breeding is able to modify the contents of inhibitors of Fe absorption, transgenic approaches have focused on enhanced Fe uptake from soil, xylem and phloem loading and grain sink strength. A comprehensive table is provided in which the percentages of the recommended dietary Fe intake reached by independently developed transgenic plants are calculated. In this review we also emphasize that the discovery of new QTLs and genes related to Fe biofortification is extremely important, but interdisciplinary research is needed for future success in this area. © 2012 Elsevier Ireland Ltd. Source

Bernardes M.A.D.S.,Centro Universitario | Zhou X.,Huazhong University of Science and Technology
Solar Energy | Year: 2013

The goal of this study is to analyze particularly the sensible heat storage physical process in a Solar Updraft Tower collector taking into account the transient heat transfer in ground through conduction, convection and solar radiation and the use of water bags. Simulations were carried out varying the thickness of some water bags sets with and without insulation regarding thermal stratification effect. Results disclosed that thicker water bags can reduce more efficiently the daily temperature spam and thermal stratification is an import thermal effect. Water bags alone are however not enough to break efficiently heat peaks. © 2013 Elsevier Ltd. Source

Ricachenevsky F.K.,Federal University of Rio Grande do Sul | Menguer P.K.,Federal University of Rio Grande do Sul | Sperotto R.A.,Centro Universitario
Frontiers in Plant Science | Year: 2013

Senescence is a coordinated process where a plant, or a part of it, engages in programmed cell death to salvage nutrients by remobilizing them to younger tissues or to developing seeds. As Fe and Zn deficiency are the two major nutritional disorders in humans, increased concentration of these nutrients through biofortification in cereal grains is a long-sought goal. Recent evidences point to a link between the onset of leaf senescence and increased Fe and Zn remobilization. In wheat, one member of the NAC (NAM, ATAF, and CUC) transcription factor (TF) family (NAM-B1) has a major role in the process, probably regulating key genes for the early onset of senescence, which results in higher Fe and Zn concentrations in grains. In rice, the most important staple food for nearly half of the world population, the NAM-B1 ortholog does not have the same function. However, other NAC proteins are related to senescence, and could be playing roles on the same remobilization pathway. Thus, these genes are potential tools for biofortification strategies in rice. Here we review the current knowledge on the relationship between senescence, Fe and Zn remobilization and the role of NAC TFs, with special attention to rice. We also propose a working model for OsNAC5, which would act on the regulation of nicotianamine (NA) synthesis and metal-NA remobilization. © 2013 Ricachenevsky, Menguer and Sperotto. Source

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