Time filter

Source Type

Talence, France

De Oliveira Campos L.D.,ArcelorMittal | Gardin P.,ArcelorMittal | Vincent S.,University Paris Est Creteil | Caltagirone J.-P.,IPB
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015

The present work provides some data on the fluid flow characteristic near a liquid-liquid interface. A water model of continuous casting mold is used. Slag layer is represented by silicon oil. Measurements are realized by laser Doppler anemometer. A viscous sublayer below the interface is detected. Its y+ depth, based on the interfacial shear stress, is approximately 9, which is larger than the corresponding viscous sublayer for a wall. Very large values of the RMS are also measured. The shear stress is only slightly affected by the two values of the oil viscosity that we tested (2×10-5m2/s and 35×10-5m2/s). A simplified model is proposed and shows that the shear stress increases by only 20% when the viscosity goes from 2×10-5m2/s to 35×10-5m2/s. Source

Adde P.,Telecom Bretagne | Gomez Toro D.,Telecom Bretagne | Jego C.,IPB | Jego C.,University of Bordeaux 1
IEEE Transactions on Signal Processing | Year: 2012

Maximum likelihood soft-decision decoding of linear block codes is addressed in this correspondence. A novel algorithm based on Chase-2 algorithm for the decoding of systematic binary block codes is detailed. A double re-encoding technique in place of the classical algebraic decoding for the computation of the candidate codeword list is the major innovation of the proposed algorithm. This approach has been successfully applied to systematic block codes that have a code rate equal to 1/2 and a parity check matrix composed of an invertible submatrix for the redundancy part. Simulation results show performance close to the optimum maximum likelihood decoding for an excellent tradeoff between BER performance and computational complexity. Then, the challenging issue of designing a decoder for a specific family of short binary block codes, called Cortex codes is also described. Three soft decoders for Cortex codes with lengths equal to 32, 64, and 128 and a code rate equal to 1/2 have been designed. Then, all the decoders were successively implemented onto an field-programmable gate array (FPGA) device. To our knowledge, they are the first efficient digital implementations of Cortex codes. © 2012 IEEE. Source

Bugeau A.,University of Bordeaux 1 | Ta V.-T.,IPB | Papadakis N.,French National Center for Scientific Research
IEEE Transactions on Image Processing | Year: 2014

In this paper, we address the problem of recovering a color image from a grayscale one. The input color data comes from a source image considered as a reference image. Reconstructing the missing color of a grayscale pixel is here viewed as the problem of automatically selecting the best color among a set of color candidates while simultaneously ensuring the local spatial coherency of the reconstructed color information. To solve this problem, we propose a variational approach where a specific energy is designed to model the color selection and the spatial constraint problems simultaneously. The contributions of this paper are twofold. First, we introduce a variational formulation modeling the color selection problem under spatial constraints and propose a minimization scheme, which computes a local minima of the defined nonconvex energy. Second, we combine different patch-based features and distances in order to construct a consistent set of possible color candidates. This set is used as input data and our energy minimization automatically selects the best color to transfer for each pixel of the grayscale image. Finally, the experiments illustrate the potentiality of our simple methodology and show that our results are very competitive with respect to the state-of-the-art methods. © 2013 IEEE. Source

Panjaitan R.G.P.,University of Tanjungpura | Handharyani E.,IPB | Chairul,Indonesian Institute of Sciences | Manalu W.,IPB
Indian Journal of Traditional Knowledge | Year: 2013

The hepatoprotective activity of Eurycoma longifolia Jack. roots methanol-water fraction on therapeutic dose was evaluated in carbon tetrachloride (CCl4)-induced rats. Hepatic cells were still normal after three months administration of methanol-water fraction at therapeutic dose. The administration of methanol-water fraction on therapeutic dose prior to CCl4-induced or CCl4-induced prior to methanol-water fraction resulted in suppression of ALT and AST. Histopathological and ultrastructure studies confirmed that methanol-water fraction protected hepatic cells. It is concluded that the methanolwater fraction of pasak bumi roots has a hepatoprotective activity. Source

Rahayu A.,IPB | Susanto S.,IPB | Setyono,Djuanda University
Acta Horticulturae | Year: 2013

'Nambangan' Pummelo has a good taste, sweet, a slightly sour and fresh, pinkred color flesh, and long shelf life, i.e., 3-4 months. Fruit production of this cultivar is fluctuated due to irregular flowering. A series of experiments was conducted to study the effect of strangulation on flowering and fruiting of 'Nambangan' pummelo trees. Three experiments were conducted at Cikabayan Research Station IPB from October 2000 to July 2007. In experiment 1 strangulation was applied using wire size 1.6 and 2.0 mm with a period of strangulation 1, 2, and 3 months. In experiment 2, the pummelo trees were strangulated using 2.0 and 3.0 mm wire size for three months period. In experiment 3, the pummelo trees were subjected to 3, 5, and 7 months period of strangulation. The result of experiment 1 showed that strangulation significantly improved flowering; 89-100% of the treated trees produced flowers, whereas all control trees were not flowered. The flower and fruit numbers, and leafcarbohydrate contents were significantly higher on the trees treated with wire size of 2.0 mm for 3 months duration. Strangulation using 3.0 mm wire size produced slightly more flowers as compared with 2.0 mm. Different duration of strangulation produced no significant difference in the flower numbers and carbohydrate content in leaves. Meanwhile, it was noted that application of seven-month strangulation duration caused severe damage on the phloem tissues. It is recommended that to improve flowering and fruiting of pummelo trees without significant damages, the strangulation should be applied using 2.0-3.0 mm of wire for not more than 3 months duration. © 2013 ISHS. Source

Discover hidden collaborations