1,656 research outputs found
Dual-PEEC Modeling of a Two-Port TEM Cell for VHF Applications
Two-port TEM cells with rectangular cross section are commonly used to produce plane electromagnetic waves with high electric field. The non-uniform structure makes the use of numerical methods extremely useful in the design phase in order to achieve a very good behavior of the TEM cell over a wide frequency range of operation. In this paper an extended version of PEEC is used to study a real device and results are compared with experimental ones
Diagnóstico das espécies florestais madeireiras utilizadas nos sistemas agroflorestais de multiestrutura, nos municípios de Barra do Turvo, SP, e Adrianópolis, PR.
Resumo
Fungos em sementes de especies florestais com potencial agrossilvicultura no Parana.
Edição dos Anais do Congresso Florestal Brasileiro, 6., 1990, Campos do Jordão
Training of Crisis Mappers and Map Production from Multi-sensor Data: Vernazza Case Study (Cinque Terre National Park, Italy)
This aim of paper is to presents the development of a multidisciplinary project carried out by the cooperation between Politecnico di Torino and ITHACA (Information Technology for Humanitarian Assistance, Cooperation and Action). The goal of the project was the training in geospatial data acquiring and processing for students attending Architecture and Engineering Courses, in order to start up a team of "volunteer mappers". Indeed, the project is aimed to document the environmental and built heritage subject to disaster; the purpose is to improve the capabilities of the actors involved in the activities connected in geospatial data collection, integration and sharing. The proposed area for testing the training activities is the Cinque Terre National Park, registered in the World Heritage List since 1997. The area was affected by flood on the 25th of October 2011. According to other international experiences, the group is expected to be active after emergencies in order to upgrade maps, using data acquired by typical geomatic methods and techniques such as terrestrial and aerial Lidar, close-range and aerial photogrammetry, topographic and GNSS instruments etc.; or by non conventional systems and instruments such us UAV, mobile mapping etc. The ultimate goal is to implement a WebGIS platform to share all the data collected with local authorities and the Civil Protectio
Possible Recycling of End-of-Life Dolomite Refractories by the Production of Geopolymer-Based Composites: Experimental Investigation
Production and characterization of geopolymers prepared by mixing metakaolin, end-of-life dolomite refractories, sodium silicate solution, and sodium hydroxide solution have been performed. The as-received refractory was crumbled in order to obtain products having, respectively, 250\ua0\u3bcm, 1 mm, and 2.5\ua0mm maximum particles size. Each batch of powder was added in different proportions to a blank geopolymeric matrix. It has been observed that the addition of waste refractory reduces workability of the reference refractory-free slurry. After hardening, only the set of samples prepared with powders with maximum size of 250\ua0\u3bcm maintain integrity while the others resulted affected by the presence of fractures caused by volumetric instabilities; samples with composition R100 showed the highest compressive strength, whereas higher refractory addition lowers strength. Specific surface area appears independent by materials composition; conversely pore volume slightly increases with the addition of dolomite refractory powder. During the thermodilatometric tests all compositions display a shrinkage of about 0.1% between 170 and 400\ua0\ub0C; however, sintering starts at higher temperature (above 600\ua0\ub0C) and samples melt in the range between 650 and 750\ua0\ub0C as a function of their composition, thus showing that the resulting materials loose refractoriness with respect to both the reference geopolymer and the dolomite refractory. Graphical Abstract: [Figure not available: see fulltext.
Preparation and Properties of Geopolymer Matrix Composites Containing Waste Olivine Sands from a Metallurgical Process
Doping the permanent magnet CeFe11Ti with Co and Ni using ab-initio density functional methods
Fitossociologia de sub-bosque de dez bracatingais (Mimosa scabrella Bentham) na regiao metropolitana de Curitiba, estado do Parana.
Modelling piezoelectric energy harvesters by a finite integration technique formulation for electromechanical coupled problems
A detailed analysis and optimization of piezoelectric devices, which nowadays are
of widespread use in electronic applications, requires numerical analysis. Numerical models based
on the Finite Element Method (FEM) have already been proposed in literature. The Finite Integration
Technique (FIT) provides stable and consistent discretization schemes for coupled multiphysics
problems. A FIT formulation with unstructured meshes, for 2-D/3-D coupled electromechanical static
or dynamic problems, is presented. Piezoelectric bimorph cantilevers, with a realistic multilayered
geometry, can be analyzed. Comparisons with FEM show the
validity and the accuracy of the method
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