21,372 research outputs found
Desenvolvimento de projeto estrutural de residência unifamiliar e projeto de fundações de guarita metálica
No full textIndisponível.Durante o período entre abril e junho de 2023, com o objetivo de complementar sua
formação acadêmica e profissional, o aluno Fernando Santos de Araújo cursou a disciplina
Estágio Supervisionado no escritório M.S. Projetos de Engenharia, sob a supervisão do
Engenheiro Civil Mustaf Said e orientação da Prof. Dra. Ellen Kellen Bellucio. O seguinte
trabalho consiste em um relatório que visa em descrever as atividades, desenvolvidas pelo
discente enquanto estagiário do escritório, que incluem o dimensionamento do projeto
estrutural e fundações de edificações.3Nã
The effect of machining condition on surface roughness of metal matrix composite (MMC) AL-SI/10% ALN in twist drill
No full textThe Metal Matrix composite (MMC) are widely used in various industrial sectors such as transportation, domestic equipment, aerospace, military, construction, etc. The purpose of this experiment was to demonstrate the surface roughness by drilling the aluminum silicon alloy (Al-Si) matrix composite reinforcement with 10% of aluminum nitride (AIN) with three types of twist drill cutting tools. This experiment was conducted at various tools type, spindle speed and feed rate according to Taguchi Method. This method is using a Standard Orthogonal Array L9. The effects of tools type, spindle speed and feed rate on the surface roughness in drilling operation were evaluated using the Taguchi optimization methodology by utilizing the signal to noise (S/N) ratio. The parameters used in machining are the spindle speed, 1000 rpm, 1500 rpm and 2000 rpm, while for the types of tools used uncoated carbide, TiN and TiCN coated and the feed rate of this research made it 50 mm/tooth, 100 mm/tooth and 150 mm/tooth. The experiment data is collected and analyzed using Taguchi Method from MINITAB 16 software. The result is show the optimum parameters are (uncoated, 1500 rpm, 50 mm/tooth). The optimum parameter gained will help the automotive, military, aerospace industry has the competitive machining process from an economic perspective and manufacturing
On using Directional Information for Parameter Space Decomposition in Ellipse Detection
No full textIn this paper we use the parametric polar representation to extend the application of edge directional information from circle to ellipse extraction. As a result we obtain a mapping which decomposes the parameter space required for ellipse extraction into two independent sub-spaces and one final histogram accumulator. The mapping includes the tangent of the angle of the first and second directional derivatives. These tangents are computed by considering edge direction at two border points. We show that the use of gradient information for parameter space decomposition avoids the intensive point labelling imposed by geometric constraints used by other approaches
Level Set Gait Analysis for Synthesis and Reconstruction
No full textWe describe a new technique to extract the boundary of a walking subject, with ability to predict movement in missing frames. This paper uses a level sets representation of the training shapes and uses an interpolating cubic spline to model the eigenmodes of implicit shapes. Our contribution is to use a continuous representation of the feature space variation with time. The experimental results demonstrate that this level set-based technique can be used reliably in reconstructing the training shapes, estimating in-between frames to help in synchronizing multiple cameras, compensating for missing training sample frames, and the recognition of subjects based on their gai
An analog simulation of the liquid helium Josephson Effect - by Said Nazimi
No full textThesis (M.S.)--Dept. of Physics, A.U.B.Includes bibliographical references
Diversity of juvenile fish assemblages in the pelagic waters of Lebanon (eastern Mediterranean)
No full textThe opening of the Suez Canal resulted in the introduction of Indo-Pacific organisms (Lessepsian) to the eastern Mediterranean. Available information on the Levantine ichthyofauna concerns mainly necto-benthic species, while pelagic ones remain mostly uncharacterized. This paper presents a preliminary assessment of biodiversity and its temporal changes on the Lebanese coast (eastern Mediterranean) using species composition and abundance of pelagic communities as indicators. For this purpose, a total of 11,192 fishes, representing 32 species and 19 families were collected with purse seines. Lessepsian species represented 40.9% of the species number in the purse-seine catches but only 0.48% in abundance of individuals and 1.57% in biomass. The families most represented in terms of abundance were the Clupeidae (49.28%), the Engraulidae (41.69%) and the Scombridae (7.01%); in terms of biomass these families represented 56.76, 22.04 and 9.72%, respectively. Abundance and biomass exhibited clear temporal fluctuations with Sardina pilchardus and Scomber japonicus dominating the catches between May and June, and then replaced by Sardinella aurita in July and Engraulis encrasicolus in August. The highest values of species richness (12 species) and diversity indices (H? = 1.37; D = 0.71) were recorded in the last two weeks of June while the lowest values (5 species, H? = 0.26; D = 0.11) were recorded in early August. While Lessepsian fishes represented a minor part in terms of landings, they contributed considerably to the diversity of pelagic fish assemblages in Lebanese water
A New Hough Transform Mapping for Ellipse Detection
No full textDetecting geometric primitives in images is one of the basic tasks of computer vision. The Hough transform (HT) and its extensions constitute a popular method for extracting geometric shapes. Primitives on the HT are represented by parametric curves with a number of free parameters. The principal concept of the HT is to define a mapping between an image space and a parameter space. Each edge point in an image is transformed by the mapping to determine cells in the parameter space whose associated parameters are such that the defined primitive passes through the data point. The chosen cells are accumulated and after all the points in an image have been considered, local maxima in the accumulator correspond to the parameters of the specified shape. Because a curve with n parameters requires an n-dimensional parameter space, many applications of the HT concern line and circle detection. In order to overcome the excessive time and space requirements for ellipse extraction, proposed techniques (Yip et al., Pao et al., Yoo and Sethi, Wu and Wang, Ho and Chen) decompose the five dimensional parameter space into several sub spaces of fewer dimensions. The decomposition is achieved by using geometric features which define constraints in the organization of edge data. These constraints include distance and angular relationships which define relative positions between a set of edge points. Hence, the parameters are computed after labelling the points which satisfy the constraints in a computational intensive approach. Here, we show how it is possible to decompose the parameter space, based on the polar definition of an ellipse. Angular information, defined from the variation of a position function, represents local change in the curvature of border points. This information is used to formulate expressions which define an ellipse by including local shape properties. We show that in order to achieve a parameter decomposition (due to the ellipse anisotropy) it is necessary to consider the angular change of the second derivative (tangent angle of the second directional derivative). We compute angular information by taking a pair of points and their gradient direction. This avoids the constraints which define relative position, as required by other approac
Copper removal by polymer immobilised Rhizopus oryzae
No full textRhizopus oryzae, strain IMI 057412, was immobilised by inclusion in six different polymers: polyvinlformal, polysulfone, polyurethane, alginate, polyacrylamide, k-carrageenan, polyethyleneimine(PEI). It was also grown on a seventh, polyurethane. The biomass/polymer matrices were formed into equal size units (4 mm spheres or cubes) and the resulting biomass/polymer matrices were used to uptake copper at 2 mg/l from a laboratory-formulated copper solution in shake flask experiments at room temperature and initially neutral pH. Results showed that the copper uptake capacity of immobilised biomass was either equal to or less than that of free biomass. Biomass immobilised in polyurethane gave a capacity equal to that of free biomass, while other matrices hindered the uptake to different degrees. The k-carrageenan matrix proved to be unstable in the copper solution and dissolved during the experiment releasing the biomass and leading to an erroneous result. The polymer matrices without biomass, with the exception of alginate and polysulfone, showed no measurable copper adsorption capacity. All the experiments were conducted in duplicate with a maximum variation between them of 7%
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