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Rio de Janeiro, Brazil

Berndsen R.S.,UP | Klitzke R.J.,Federal University of Parana | Batista D.C.,UFES | Do Nascimento E.M.,Federal Technological University of Parana | Ostapiv F.,Federal Technological University of Parana
Floresta | Year: 2013

The aim of this study was to determine the mechanical properties of bending and compression parallel to grain of Moso bamboo (Phyllostachys pubescens) and analyze the effect of stem position and age on these properties. It was also studied the correlation between the bulk density and mechanical properties. The tests used specimens produced in glued laminated material, adapted according to ASTM D143 solid wood-96 norm, following proportions maintained by Ahmad (2000). The results revealed increasing trend of resistance in bending with age and stem position in absolute terms. In relation to compression tests parallel to grain, the compression strength (fc) and the MOE had the same tendency to increase resistance with age and with the position. The tests revealed that there was no statistically significant interaction between age and culm position. The apparent density of bamboo revealed a positive and linear correlation in bending test at MOR and MOE, as well as at parallel compression test to the fibers for the compression force (fc) and the MOE. Low correlation coefficients had been obtained between the focused apparent density and mechanical properties. Source


Barbier M.,French Institute of Petroleum | Lepretre R.,French Institute of Petroleum | Lepretre R.,CNRS Paris Institute of Earth Sciences | Callot J.-P.,Avenue Of Luniversite Bp 1155 | And 5 more authors.
Tectonophysics | Year: 2012

Based on the study of the Madison Limestone at Sheep Mountain and Rattlesnake Mountain, a unique outcrop dataset including (1) facies and diagenetic analyses, (2) vertical persistence and cement stratigraphy of vein sets and (3) fluid inclusions thermometry are used to demonstrate the impact of folding and fracturing on paleo-hydrogeology. Quantification of the vertical persistence of fractures shows that Sheep Mountain and Rattlesnake Mountain differ by the vertical persistence of the pre-folding Laramide vein sets, which are strictly bed-confined in Sheep Mountain but cut across bedding at Rattlesnake Mountain, whereas the syn-folding veins are through-going in both. The emplacement chronology and the various sources of the fluids responsible for the paragenetic sequence are based on isotope chemistry and fluid inclusions analysis of the matrix and vein cements. At Sheep Mountain and Rattlesnake Mountain, the cements related to the burial are characterized by isotopic signatures of marine formation waters that were diluted during the karstification of the Madison Platform at the end of Mississippian. Meteoric fluids, presumably migrating during the Cenomanian from Wind River Range and Teton Range, recharge zones located in the south-west of the Bighorn Basin, were remobilized in the early bed-confined and through-going syn-folding veins of the Sheep Mountain Anticline. The former vein set drained only local fluids whose isotopic signature relates to an increase of temperature of the meteoric fluids during their migration, whereas the latter set allowed quick drainage of basinal fluids. © 2012 Elsevier B.V. Source


Markic M.,UP | Kolenc I.,Alcan Tomos | Miklavcic Sumanski M.,Alcan Tomos | Zivkovic S.,Univerzitet u Nisu
Sigurnost | Year: 2011

The intention of the paper was to determine how certain selected factors influence preventive attitude of managers towards health and safety in the workplace. The paper is based on a survey which included 351 CEOs in larger Slovenian companies. The evaluation of data was made using the SPSS program. We found the strongest correlation between variables of preventive attitude towards health and safety between education and investments, and education and safety at work. Analysis showed that the correlation between leadership and preventive safety of this sample is positive and influences the health and safety results (the correlation is relatively high, β coefficient 0,473). Study findings are current and may be useful to those involved in changing the legislation related to health and safety in the workplace. We recommend that preventive safety and incentives be built into the legislation, as it is evident that the CEOs are inclined to honour legal obligations. Source


Singh J.,UP | Maurya L.S.,S.R.M.S. CET
2013 IEEE 2nd International Conference on Image Information Processing, IEEE ICIIP 2013 | Year: 2013

Affordability, redistributable, modifiability, availability of source code, zero price and freedom of choice are the characteristics which have made Open source (OS) a preferred platform for many software industries and individuals, who believe to use the power of high quality software. The technological motivation for OSS development directly relates to the software crisis, which clearly specifies that traditional development do not perform very effectively, specifically in the areas of speed, quality and cost of development. In this paper fact regarding open source software as well as different reliability concepts are elaborated. Practical implementation of OSS reliability modeling and decision making about product release has been done. For this purpose software performance measures Failure intensity, Mean Time to Failure (MTTF) and Reliability of three different open source software's failure data sets are computed and analyzed. Comparative selection of best suited Software Reliability Growth Model (SRGM) among four SRGMs for concerned data sets have been done on the basis of two comparison parameters Bias and SSE. © 2013 IEEE. Source


Berndsen R.S.,UP | Klitzke R.J.,Federal University of Parana | Batista D.C.,UFES | do Nascimento E.M.,Federal Technological University of Parana | Ostapiv F.,Federal Technological University of Parana
Floresta | Year: 2014

Bamboo is a natural resource with a wide range of applications, especially moso bamboo (Phyllostachys pubescens Mazel ex H. de Lehaie), which is one of the most used species in the world. The main objective of this work was to determine the axial tensile strength, hardness and wear resistance of moso bamboo culms planted in Paraná, Brazil. Axial tensile strength was tested by the modification of a standard designed for wood; hardness was measured by the Brinell Test method and wear resistance was assessed by the taber abraser method. Analysis of variance with a factorial arrangement was applied to verify the effect of the treatments, resulting from the combination of three ages (one, three and five years old) and three culm positions (base, middle and top), and to check a possible interaction between these factors. No significant interaction was verified between age and position for axial tensile strength and hardness, and these properties increased as the age increased and culm position rose. Moso bamboo has potential for the flooring industry because of its low mass loss in the test of wear resistance and the satisfactory hardness when compared to other bamboo species and to traditional Brazilian timber species. Source

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