Guimaraes R.B.,FCT Inc.
Revista Brasileira de Epidemiologia
Geographic studies and spatial analyses have been recognized in Brazilian public health papers. It is still, however, very little explored by researchers. In a survey of the leading scientific journals covering issues related to Brazilian worker's health, we found the predominant use of charts and tables as a way to organize and present results with a small number of maps. This survey was conducted by examining all papers published in four journals, covering the period from 1967 to 2009 (Revista de Saúde Pública, Cadernos de Saúde Pública, Revista Saúde e Sociedade, and Revista Brasileira de Epidemiologia). After analyzing the set of papers selected for the study, the papers that used maps were given special attention. The tools of geoprocessing and geostatistics with GIS support, although little used, open new possibilities to use thematic cartography in the field of workers' health. However, it is recommended that editors of scientific journals have detailed technical standards as well as specific reports for the publication of cartographic figures aimed at facilitating the modifications necessary for the improvement of the visual quality of maps and of the spatial correlations through cartography. Source
Brito D.,FCT Inc. |
Pereira P.,LECG |
Pereira P.,University of Lisbon |
Vareda J.,CEFAGE UE
International Journal of Industrial Organization
We analyze if two-part access tariffs solve the dynamic consistency problem of the regulation of next generation networks. We model the industry as a duopoly, where a vertically integrated incumbent and a downstream entrant, that requires access to the incumbent's network, compete on Hotelling's line. The incumbent can invest in the deployment of a next generation network that improves the quality of the retail services. We have three main results. First, we show that if the regulator can commit to a policy, a regulatory moratorium may emerge as socially optimal. Second, we show that if the regulator cannot commit to a policy, it can induce investment only when the investment cost is low. Third, we show that in this case, two-part tariffs involve very large payments from the entrant to the incumbent. © 2009 Elsevier B.V. All rights reserved. Source
Anifowose B.,Coventry University |
Odubela M.,FCT Inc.
Journal of Cleaner Production
Climate change impacts are increasingly becoming more evident e.g. through heavy rainfall episodes and subsequent flooding. Methane is a significant greenhouse gas that has been linked to these impacts and the oil and gas industry is a major source of anthropogenic methane emission. Recent studies have suggested that the tropical region hold some unexpectedly high methane concentration and that the recent changes in the global methane burden are poorly understood. To address this research gap, we present a first effort to quantify methane emissions from one of the most vulnerable oil and gas infrastructures in Nigeria (a tropical country). A combination of the Intergovernmental Panel on Climate Change tier-1 approach and an adapted Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation model was used to estimate methane emissions from the system 2C transport pipeline. We then tested the hypothesis of no significant change in methane emissions trend from the pipeline using the between group t-test inferential analysis. Key findings include: (a) a crude oil throughput of 55,143 to 1,500,500 barrels (8767 to 238,561 m3) emitted methane ranging from 0.04734 to 1.288MT (± 50 to 200%) respectively, and (b) surprisingly, methane emissions along the system 2C pipeline seem to have continued without significant change between 2005, and 2008 to 2012 despite the low crude oil throughput in 2009. This indicates the likelihood of continuous but rising methane emissions from the pipeline network over a six-year period; and only further research can ascertain if similar trend can be observed elsewhere in the tropical region. These findings are unique and contribute to the current global debate on methane emissions from the largely unmonitored tropical region. Therefore, we recommend that stakeholders should set up a study plan for the identification and continuous monitoring of methane emissions from the key oil and gas infrastructure and explore opportunities for geoengineering applications as part of climate change mitigation. Coordinated engagement in international schemes such as the Natural Gas STAR program, Climate and Clean Air Coalition, Global Methane Initiative amongst others would promote strategic and measurable methane reduction plans in Nigeria and other countries within/outside the tropical region. © 2014 Elsevier Ltd. All rights reserved. Source
Clement T.,Ecole Polytechnique Federale de Lausanne |
Ramos A.P.,FCT Inc. |
Ruiz M.F.,Ecole Polytechnique Federale de Lausanne |
Muttoni A.,Ecole Polytechnique Federale de Lausanne
Prestressing in flat slabs helps to control deformations and cracking under service loads and allows the required slab thickness to be reduced, thus leading to more slender structures and an economic solution for long spans. However, as a consequence of the limited thickness of these members, punching typically governs at the ultimate limit state. Studies of the punching shear strength have shown that the presence of prestressing in flat slabs has a number of potential beneficial effects, namely the vertical component (force) carried by inclined tendons, the in-plane compression stresses and the bending moments developed near the supported region. However, the approach provided by codes of practice for punching design in the presence of prestressing may differ significantly. Some codes neglect the influence of the bending moments introduced as a result of prestressing and the sections at which the deviation forces of the tendons are considered may be located at different distances from the edge of the supported region. The influence of prestressing on the punching shear strength of members without shear reinforcement is investigated in this paper by using the fundamentals of the critical shear crack theory. Using that as a basis, and also taking into account 65 tests available in the scientific literature, the suitability and accuracy of a number of design codes, e.g. Model Code 2010, Eurocode 2 and ACI 318-11, are investigated and compared. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source
Sosa S.,University of Houston |
Banchs J.,FCT Inc.
We report 4 cases of patients diagnosed with stress-induced cardiomyopathy and the pattern of typical apical ballooning syndrome (ABS), who presented to our institution with chest pain, mildly elevated cardiac enzymes and ischemic electrocardiographic changes, found to have severe hypokinesis or akinesis of the mid to apical segments with dynamic basal segments on two-dimensional (2D) echocardiography along with a global longitudinal strain (GLS) pattern markedly different from the typical left anterior descending artery (LAD) myocardial infarction pattern. All of them had a similar GLS pattern on presentation, which was easy to recognize on the polar map the day of the event. Three of the patients underwent left heart catheterization and found to have nonobstructive coronary artery disease (CAD). We discuss the usefulness of early recognition of ABS using GLS images. Mini-Abstract In this case series we report 4 cases of patients diagnosed with stress induced cardiomyopathy apical ballooning syndrome (ABS), who presented to our institution with chest pain, mildly elevated cardiac enzymes and ischemic electrocardiographic changes. They were found to have severe hypokinesis or akinesis of the mid to apical segments with dynamic basal segments on echocardiography. A global longitudinal strain (GLS) pattern on polar map was markedly different from the pattern of proximal left anterior descending artery (LAD) myocardial infarction. All of them had a similar GLS pattern on presentation, which was easy to recognize on these polar maps images the day of the event. We discuss the usefulness of early recognition of ABS using global longitudinal strain images. © 2015, Wiley Periodicals, Inc. Source