Leaves deposition and nutrients of tree species in a native forest in southern Brazil [Deposição de serapilheira e nutrientes por espécies nativas em uma floresta estacional decidual em Itaara, RS, Brasil]
Vogel H.L.M.,UNIPAMPA |
Schumacher M.V.,Federal University of Santa Maria |
Truby P.,Albert Ludwigs University of Freiburg
Floresta | Year: 2012
The present study was conducted in a fragment of a seasonal deciduous forest in Itaara (State of Rio Grande do Sul, Brazil). This research has as its main aim to evaluate the monthly leaves production and nutrients transfer to the soil of seven native species. Six plots (25 m × 17 m) were delimited to collect the deposited leaves, with five round collectors in each plot, in a total of 30 collectors. The deposited leaves had been collected monthly during a period of 24 months. In such material it was determined the content of nutrients as N, P, K, Ca, Mg, S, Fe, Mn and Zn. In laboratory, the leaves were identified into seven native species: Ocotea puberula (A. Rich.) Nees, Ocotea pulchella Mart., Nectandra megapotamica (Spreng.) Mez, Matayba elaeagnoides Radlk., Cupania vernalis Cambess., Parapiptadenia rigida (Benth.) Brenan and Schinus molle L. The results revealed a variation in deposition in relation to the amount of leaves as well as in forest soil among the native species analyzed. The tree species which transferred more litter and nutrients (mainly N, P, K, Ca and S) was Parapiptadenia rigida.
Ghissoni S.,UNIPAMPA |
Da Costa E.A.C.,Catholic University of Pelotas |
Da Luz A.G.,SENAC
IEEE/IFIP International Conference on VLSI and System-on-Chip, VLSI-SoC | Year: 2015
This paper addresses the reordering of coefficients, i.e., twiddle factors in multicore FFT in order to obtain power efficient datapaths. The coefficients are divided in smaller ones into the different cores and they are reordered through the Improved Anedma heuristic-based algorithm. According to the characteristics of the FFT algorithms, which involve multiplications of input data with appropriate coefficients, the best ordering of these operations, into each core, can contribute for the reduction of the switching activity, what leads to the minimization of power consumption in the FFTs. Therefore, the appropriate ordering of coefficients in the different cores allows finding the best architecture in terms of both performance and power consumption. The FFT architectures were synthesized using SYNOPSYS Design Compiler for the XFAB 180 nm technology. The results show that it is possible to achieve power reduction in the FFTs close to 9%, on average, after reordering the twiddle factors in the different cores. © 2014 IEEE.
Mussoi E.M.,University of Santa María in Ecuador |
Falkembach G.A.M.,Faculdades QI |
2015 10th Iberian Conference on Information Systems and Technologies, CISTI 2015 | Year: 2015
This article focuses on the use of Information and Communication Technologies in education aimed at learning process. The purpose of this article is to address the resources offered by social networks, which can be used by the teacher in the teaching process to stimulate the student to study. The methodology of this study is a literature review that shows the trend of increasing use of the Internet including social networks, promoting reflection on the impact of these resources on society, culture and education. In conclusion of this reflection can design that among the new pedagogical strategies to be used by teachers to motivate students to study are social networks, specifically Facebook and the challenge is to train teachers to work with this feature productively. © 2015 AISTI.
Dias K.N.,Federal University of Pampa |
Welfer D.,Federal University of Santa Maria |
IEEE Latin America Transactions | Year: 2016
For the treatment of Hospital-Acquired Pneumonia (HAP) is necessary accuracy in diagnosis, according to the guidelines of a hospital. Moreover, the diagnosis and treatment of HAP should be performed immediately. To assist in this process, this work presents the PneumoH, which consists in a mobile application for supporting to physicians in the HAPs diagnosis and treatment. In order to evaluate PneumoH, an acceptance test was accomplished in a high circulation public hospital, relying on the participation of an infectious diseases expert. Our preliminary evaluation of the PneumoH indicates that it is useful for clinical practice. © 2003-2012 IEEE.
Tusset A.M.,Federal Technological University of Paraná |
Balthazar J.M.,Claro |
Bassinello D.G.,São Paulo State University |
Pontes B.R.,São Paulo State University |
Nonlinear Dynamics | Year: 2012
In this work, we deal with a micro electromechanical system (MEMS), represented by a micro-accelerometer. Through numerical simulations, it was found that for certain parameters, the system has a chaotic behavior. The chaotic behaviors in a fractional order are also studied numerically, by historical time and phase portraits, and the results are validated by the existence of positive maximal Lyapunov exponent. Three control strategies are used for controlling the trajectory of the system: State Dependent Riccati Equation (SDRE) Control, Optimal Linear Feedback Control, and Fuzzy Sliding Mode Control. The controls proved effective in controlling the trajectory of the system studied and robust in the presence of parametric errors. © Springer Science+Business Media B.V. 2012.
De Oliveira A.B.,Federal University of Rio Grande do Sul |
Da Silva P.R.,UNIPAMPA |
Barone D.A.C.,Federal University of Rio Grande do Sul
Pattern Recognition Letters | Year: 2015
Abstract In this paper we propose a new method for the shape characterization of boundaries based on complex networks and spectral graph theory, called CNSS (complex network spectrum signature). The method creates a complex network with boundary points of 2D shapes, and the dynamic of the network is analyzed by means of the spectral graph theory. The eigenvalues of the graph spectrum are combined to create a shape descriptor or signature that is robust under rotation, scale, noise and occlusions. The graph spectrum is associated with its topological properties and can be used to recognize the patterns of a shape. The CNSS method has been tested with a 2D shape benchmark database and is employed for action human activity shapes. The method achieved very good results for discriminating object shapes in different classes, including in situations where there are objects with high levels of within-class variation, partial occlusion and noise contamination. © 2015 Elsevier B.V.
ACM International Conference Proceeding Series | Year: 2013
Open Government Data (OGD) is a technology platform adopted by governments to meet new society demands. This theme is based on the assumptions of transparency, collaboration and participation. It is believed that from these initiatives, it is possible to generate activities of economic and social value through the use of public data by society. However, some challenges emerge for the effective achievement of these objectives. They include a series of factors, among which we highlight: technical problems related to the handling of information within government structures, political principles of each government, priorities of government actions, legal issues and aspects related mainly to the interest and use of this information by society. Thus, the main purpose of this study is to identify and describe the activities developed along the value chain of open government data.
Dihl L.,Pontifical Catholic University of Rio Grande do Sul |
Jung C.R.,Federal University of Rio Grande do Sul |
Proceedings - 24th SIBGRAPI Conference on Graphics, Patterns and Images | Year: 2011
This paper presents a novel patch-based approach for object tracking robust to partial and short-time total occlusions. Initially, the original template is divided into rectangular subregions (patches), and each patch is tracked independently. The displacement of the whole template is obtained using a weighted vector median filter that combines the displacement of each patch and also a predicted displacement computed based on the previous frames. An updating scheme is also applied to cope with appearance changes of the template. Experimental results indicate that the proposed scheme is robust to partial and short-time total occlusions, presenting a good compromise between accuracy and execution time when compared to other competitive approaches. © 2011 IEEE.
Nascimento J.E.R.,Federal University of Pelotas |
Barcellos A.M.,Federal University of Pelotas |
Sachini M.,Federal University of Pelotas |
Perin G.,Federal University of Pelotas |
And 4 more authors.
Tetrahedron Letters | Year: 2011
We describe herein the use of glycerol as an efficient, safe and recyclable solvent in the one-pot hetero-Diels-Alder (HDA) reaction of (R)-citronellal with substituted arylamines. The catalyst-free reactions proceed easily using glycerol at 90 °C and the corresponding octahydroacridines (OHAs) were obtained in good to excellent yields by simply decantation of products. After removing the products, glycerol was directly reused for further HDA reactions without lost of activity. © 2011 Elsevier Ltd. All rights reserved.
PubMed | Federal University of Pampa and UNIPAMPA
Type: | Journal: Neurotoxicology | Year: 2015
The -orizanol present in rice bran oil contains a mix of steryl triterpenyl esters of ferulic acid, which is believed to be linked to its antioxidant potential. In this study we investigated the neuroprotective actions of -orizanol (ORY) against the toxicity induced by rotenone (ROT) in Drosophila melanogaster. The flies (both genders) aged between 1 and 5 days old were divided into four groups of 50 flies each: (1) control, (2) ORY 25 M, (3) ROT 500 M, (4) ORY 25 M+ROT 500 M. Flies were concomitantly exposed to a diet containing ROT and ORY for 7 days according to their respective groups. Survival and behavior analyses were carried out in vivo, and ex vivo analyses involved acetylcholinesterase activity (AChE), determination of dopaminergic levels, cellular viability and mitochondrial viability, activities of superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), reactive species levels (RS), lipid peroxidation (TBARS) and contents of total thiols and non-proteic thiols (NPSH). Our results show for the first time that ORY not only acts as an endogenous activator of the cellular antioxidant defenses, but it also ameliorates rotenone induced mortality, oxidative stress and mitochondrial dysfunction. Our salient findings regarded the restoration of cholinergic deficits, dopamine levels and improved motor function provided by ORY. These results demonstrate the neuroprotective potential of ORY and that this effect can be potentially due to its antioxidant action. In conclusion, the present results show that ORY is effective in reducing the ROT induced toxicity in D. melanogaster, which showed a neuroprotective action, possibly due to the presence of the antioxidant constituents such as the ferulic acid.