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Frontiers in Education (FIE) Conference

作者： Maurício Dziedzic Fernanda Borges de Oliveira Paulo Roberto Janissek Rebecca Moreira Dziedzic Graduate Program in Environmental Management Universidade Positivo Curitiba Brazil Dept. of Civil Engineering University of Toronto Toronto Canada

ISBN: (纸本)9781467352598

The study reported herein considered three questionnaires available for assessing learning styles, viz., Kolb, Honey-Alonso, and Felder-Soloman. The questionnaires were implemented in a spreadsheet with automated results, and distributed to subjects of both genders, and varying age, and academic background. The aim of the work was to determine which questionnaire, if any, would be preferred by respondents. The respondents were asked to answer all three questionnaires, examine the results and indicate their satisfaction by grading each result, using a scale between 0 and 10. While the results given by each questionnaire do not allow a complete comparison, partial agreement was possible to identify. Answers provided by 52 respondents have been processed, which show that, while there is no statistically significant difference among the preference of respondents regarding the three options, a slight preference for the Felder-Soloman questionnaire is discernible.

关键词： Pragmatics Large scale integration Visualization Abstracts Education Sensors Concrete

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GIS as a Decision Support Tool in the Area of Influence of the Nuclear Complex Angra dos Reis, Brazil

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Journal of Geographic Information System 2013年第1期5卷 13-23页

作者： Corbiniano Silva Luiz Landau Luiz Claudio Gomes Pimentel Paulo Fernando Lavalle Heilbron Filho Civil Engineering Program Alberto Luiz Coimbra Institute of Post Graduate Studies and Research Federal University of Rio de Janeiro Rio de Janeiro Brazil Mechanical Engineering Program Alberto Luiz Coimbra Institute of Post Graduate Studies and Research Federal University of Rio de Janeiro Rio de Janeiro Brazil National Commission for Nuclear Energy Rio de Janeiro Brazil

The outlook concerning the occurrence of industrial accidents has led to the implementation of response systems based on geoprocessing tools, which are widely adopted in emergency for such ventures, since they have helped and served as a support for decision making, as well as for the preparation of guidelines aimed at managing emergencies. Nuclear power plants, because they constitute types of industrial activities that present dangerous conditions and attention regarding security are characterized as hazardous, especially due to consequences that occurred from large accidents— such as Chernobyl (1986) and Fukushima (2011)—highlighting the importance to its negative impacts, since the occurrence of accidents at nuclear power plants may affect surrounding areas, thus exposing a set of elements that are part of the environmental dynamics that integrates the catchment area where this type of plant is situated. In this way, through an integrated view of the region where the nuclear complex is located in Angra dos Reis City (Rio de Janeiro State) and, also, by aggregating information that portray the geobiophysical reality of its surroundings, several elements were incorporated into a database developed in a virtual environment, in which was produced a geographic information system (GIS) that presents a complex of variables that, once considered, can enhance various analysis in order to support emergency situations and planning, as well as guidelines that help define actions from the occurrence of accidental events at the nuclear plant.

关键词： Industrial Accidents Nuclear Power GIS Planning of Emergency Response Systems

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Evaluating Performance of a Proactive Optimal Variable Speed Limit Control Using Different Objective Functions

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Procedia - Social and Behavioral Sciences 2013年 96卷 2895-2906页

作者： Md. Hadiuzzaman Jie Fang Ying Luo Tony Z. Qiu Graduate Research Assistant Department of Civil and Environmental Engineering University of Alberta Edmonton T6G 2W2 Canada Post Doctoral Fellow Department of Civil and Environmental Engineering University of Alberta Edmonton T6G 2W2 Canada Assistant Professor Department of Civil and Environmental Engineering University of Alberta Edmonton T6G 2W2 Canada

Proactive optimal Variable Speed Limit (VSL) control is a promising solution to improve both the freeway capacity and the travel time. Despite this well-recognized fact, most of the previous studies found that the VSL control strategy was capable of improving only the freeway travel time. This finding hinders the overall mobility benefits from the computationally intensive proactive optimal VSL control and its credibility compared to the other control strategies those do not involve real-time traffic state prediction and optimization. To resolve this issue, in this paper, the authors adopt a previously developed novel VSL control strategy that explicitly considers traffic characteristics at active bottleneck, and its upstream-downstream links. Then, the performance of the control strategy has been evaluated within a predictive control framework, considering several objective functions (including stand-alone objective and combination of multiple objectives). Moreover, within the control framework, DynaTAM-VSL has been used as a prediction model. To find the optimal values of control variable at each control horizon, the authors adopt the multi-start Sequential Quadratic programming, which starts a local solver from multiple start points. A sensitivity analysis is performed to see how the weight parameters of the partial objectives influence the VSL performance, which resolves existing paradoxical results of VSL mobility benefits. In addition, the model is simulated for a range of demand inputs, and analysis is carried out to see how efficient the VSL control is to improve the freeway mobility.

关键词： Model predictive control variable speed limit capacity drop METANET DynaTAM-VSL

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Structural behavior of HFRP-UHPFRC composite girders

Structural behavior of HFRP-UHPFRC composite girders

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Structures Congress 2013: Bridging Your Passion with Your Profession

作者： Nguyen, H. Mutsuyoshi, H. Zatar, W. Nick J. Rahall II Appalachian Transportation Institute P.O. Box 5425 Huntington WV 25703-0425 United States Saitama University Japan International Collaborative Graduate Program on Civil and Environmental Engineering Saitama University Shimo-Okubo 255 Sakura-ku Saitama-shi 338-8570 Japan College of Information Technology and Engineering Marshall University 112 Gullickson Hall Huntington WV 25755-2586 United States

ISBN: (纸本)9780784412848

This paper presents the structural behavior of composite girders composed of glass/carbon fiber reinforced polymers (GFRP/CFRP) I-profiles and precast Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) slabs. Three full-scale composite girders with varying UHPFRC slab widths were tested under four point loading to examine the flexural behavior of the composite girders. Shear connectors with/without epoxy bonding were used. The bolt shear connectors and epoxy were used to resist the horizontal shear flow at the interface between the hybrid CFRP/GFRP (HFRP) I-profile and the UHPFRC slab. The composite action between the HFRP I-profile and UHPFRC slab was investigated. The test results showed that the composite girders exhibited significant improvements in stiffness and strength, above those of single HFRP girders. Three-dimensional nonlinear finite element (FE) analysis was carried out and compared against the experimental results of the tested girders. A fairly good agreement among the experimental and FE analysis results was found. The study revealed that the HFRP-UHPFRC composite girders are efficient and can provide a competitive, cost-effective and sustainable solution to bridge structures. © 2013 American Society of civil Engineers.

关键词： Cost effectiveness

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Fundamental study on impact factor for fatigue design of highway bridges based on moving vehicle response analysis 5

Fundamental study on impact factor for fatigue design of hig...

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5th International Conference on New Dimensions in Bridges, Flyovers, Overpasses and Elevated Structures

作者： Nakano, Kazuya Nakamura, Shozo Nishikawa, Takafumi Civil and Environmental Engineering Program Graduate School of Engineering Nagasaki University 1-14 Bunkyo-machi Nagasaki852-8521 Japan Department of Civil and Environmental Engineering Graduate School of Engineering Nagasaki University 1-14 Bunkyo-machi Nagasaki852-8521 Japan

ISBN: (纸本)9789810727291

Fatigue design was newly included in Japanese design code for highway bridges in the recently revised edition as one of the limit states of structures to be verified in design. The current Japanese design code specifies the impact factor as a function of only span length. Details of analysis method for fatigue of steel highway bridges are described in the fatigue design recommendation, and impact factor is specified to be a half of the value determined in the design code based on the judgment that its average value should be used for fatigue design. However, it is not clearly shown that this value represents adequately dynamic influence on fatigue damage. This paper suggests a calculation method of impact factor for fatigue design. In this method, dynamic response analysis of a bridge against a running vehicle is combined with the Monte Carlo simulation. Impact factor is decided from the ratio of fatigue damages based on dynamic and static analyses. Moreover, impact factors of three simply supported composite girder bridges with different spans are calculated by this method. Three types of roughness on road surfaces are considered in the analysis. The main findings can be summarized as follows: (1) The impact factor becomes smaller when the span length becomes shorter;(2) When road surface condition is average or poor, the impact factor in the recommendation underestimated the dynamic influence for fatigue damages;(3) The vehicle speed has certain influence on the value of impact factor. The influence is not monotonie, but it reaches maximum when the speed is 40km/h.

关键词： Highway bridges

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Influence of CDW Recycled Aggregate on Drying Shrinkage of Mortar

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Open Journal of civil engineering 2012年第2期2卷 53-57页

作者： Paulo Roberto Lopes Lima Monica Batista Leite Civil and Environmental Engineering Post-Graduate Program State University of Feira de Santana Feira de Santana Bahia Brazil

The use of fine recycled aggregates as raw material in the production of mortars appears as a good alternative to minimize waste disposal, so as to reduce natural resources consumption and to find and supply suitable substitutes for natural aggregates. However, the use of this alternative material in a safe way must be carried out by a wide investigation of its long term behavior. In this way, this paper will examine the mechanical strength, physical properties and drying shrinkage of mortar, which use recycled fine aggregates that have originated from construction and demolition waste (CDW) containing mortar (55%), ceramic (26%) and concrete (16%). Two natural mortars, made with natural sand, were produced with cement/sand ratios of 1:4 and 1:8 (by weight) and a fixed consistency index of 260 +10 mm. Recycled mortar was produced with 50% of substitution rate, in volume, of natural aggregate by recycled one. Results show that recycled mortars present higher total porosity, absorption rate and drying shrinkage than reference mortar.

关键词： Recycled Mortar Construction and Demolition Waste Drying Shrinkage Recycled Aggregate

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Erratum to: Workability study of concretes made with recycled mortar aggregate

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Materials and Structures 2013年第10期46卷 1779-1779页

作者： Mônica B. Leite João Gualberto L. Figueirêdo Filho Paulo R. L. Lima Post-graduation Program of Civil and Environmental Engineering Department of Technology State University of Feira de Santana Feira de Santana Brazil PPGECEA/UEFS Feira de Santana Brazil

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Habitat protection for sensitive species: Balancing species requirements and human constraints using bioindicators as examples

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Natural Science 2013年第5期5卷 50-62页

作者： Joanna Burger Michael Gochfeld Charles W. Powers Lawrence Niles Robert Zappalorti Jeremy Feinberg James Clarke Conserve Wildlife Foundation of New Jersey Greenwich NJ USA Consortium for Risk Evaluation with Stakeholder Participation Vanderbilt University Nashville TN USA Department of Civil and Environmental Engineering Vanderbilt University Nashville TN USA Division of Life Sciences Rutgers University Piscataway NJ USA Ecology and Evolution Graduate Program Rutgers University New Brunswick NJ USA Division of Life Sciences Rutgers University Piscataway NJ USA Environmental and Occupational Health Sciences Institute Rutgers University Piscataway NJ USA Consortium for Risk Evaluation with Stakeholder Participation Vanderbilt University Nashville TN USA Environmental and Occupational Health Sciences Institute Rutgers University Piscataway NJ USA Consortium for Risk Evaluation with Stakeholder Participation Vanderbilt University Nashville TN USA Environmental and Occupational Medicine UMDNJ-Robert Wood Johnson Medical School Piscataway NJ USA Herpetological Associates Inc. Jackson NJ USA

Vertebrates have particular habitat needs as a function of life cycle and reproductive stage. This paper uses four species as examples to illustrate a paradigm of environmental assessment that includes physical, biological, toxicological and human dimensions. Species used include Chinook salmon (Oncorhynchus tshawytscha), northern leopard frog (Rana pipiens), northern pine snake (Pituophis m. melanoleucus), and red knot (Calidris canutus rufa, a sandpiper). The life cycles of these species include reliance on habitats that are aquatic, terrestrial, aerial, or combinations of these. Two species (frog, snake) are sedentary and two (salmon, sandpiper) are long-distance migrants. While some measurement endpoints are similar for all species (reproductive success, longevity, contaminant loads), others vary depending upon life cycle and habitat. Salmon have a restricted breeding habitat requiring coarse sand, moderate current, and high oxygen levels for adequate egg incubation. Leopard frogs require still water of appropriate temperature for development of eggs. Pine snakes require sand compaction sufficient to sustain a nest burrow without collapsing, and full sun penetration to the sand to allow their eggs in underground nests to incubate and hatch. Red knots migrate to high Arctic tundra, but incubate their own eggs, so temperature is less of a constraint, but feedinging habitat is. These habitat differences suggest the measurement endpoints that are essential to assess habitat suitability and to manage habitats to achieve stable and sustainable populations. Habitat use and population stability have implications for human activities for some, but not all species. Salmon are important economically, recreationally, and as part of Native American culture and diet. Red knots are of interest to people mainly because of their long, intercontinental migrations and declining populations. Other measurement endpoints for these four species illustrate the differences and similarit

关键词： Assessment environmental Monitoring Bioindicators Habitat vulnerabilities Salmon Frog Snake Bird

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Analysis of two schemes using micro hydroelectric power (MHPs) in the Amazon with environmental sustainability and energy and economic feasibility

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Environment, Development and Sustainability 2012年第2期14卷 283-295页

作者： Quintas, Marlus C. Blanco, Claudio J.C. Mesquita, André L. Amarante Post-Graduate Program in Mechanical Engineering PPGEM/ITEC/UFPA Federal University of Pará Belém PA 66075-110 Rua Augusto Côrrea 01 Brazil Faculty of Sanitary and Environmental Engineering FAESA/ITEC/UFPA Federal University of Pará Belém PA 66075-110 Rua Augusto Côrrea 01 Brazil Faculty of Mechanical Engineering FEM/ITEC/UFPA Federal University of Pará Belém PA 66075-110 Rua Augusto Côrrea 01 Brazil

A major problem for sustainable development in the Amazon is the difficulty of supplying electric power to isolated communities, which represent a considerable share of the population. This problem has been a major obstacle to productive activities (especially extractive and agricultural) in such communities, thus significantly contributing to rural drift and creating social problems in larger cities. In that case, one way to supply electric power would be to use the huge network of small rivers in the region by implementing Micro Hydroelectric Power Plants (MHPs). However, this type of hydropower project requires a set of technical assessments in order to obtain better value for its cost-effectiveness from the perspective of sustainable development. Thus, based on a survey of energy demand and the local hydrological and topographical characteristics, two possible MHP designs for the hydrological site under analysis were suggested. Assessments of hydropower, economic and environmental aspects were developed. MHP designs were compared with the diesel generator design of the community under focus. Comparison showed that the MHP designs are feasible in terms of energy to meet local demand;economically, they are more feasible than the diesel generator and are environmentally sustainable, mainly because such designs involve low-head, run-of-river MHPs and the flooded areas were simulated and are not larger than 0.02 km ². Therefore, the information provided by these assessments constitutes important data, serving as subsidies for MHP implementation projects, which shall contribute to sustainable development in the region. © 2011 Springer Science+Business Media B.V.

关键词： Amazon Isolated communities MHP Small environmental impact

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Acoustic performance of closing panels used in steel-structured buildings

Acoustic performance of closing panels used in steel-structu...

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18th International Congress on Sound and Vibration 2011, ICSV 2011

作者： Ribas, Rovadávia A.J. Souza, Henor A. Civil Engineering Post-Graduate Program Universidade Federal de Ouro Preto Escola de Minas Campus Morro do Cruzeiro 35400-000 Ouro Preto - MG Brazil

ISBN: (纸本)9781618392596

In this research, it was made the evaluation of the acoustic performance of some closing systems mostly used in steel-structured buildings in Brazil, for instance walls made of the cement plates, precast concrete panels and plasterboard walls. The acoustic performance was evaluated by estimating the sound transmission loss that occurs through them using a simplified graphical method. It was studied the performance of these kinds of panels and their combinations forming double panels, with and without sound-absorbing material between them. Copyright © (2011) by the International Institute of Acoustics & Vibration.

关键词： Precast concrete

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