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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.


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.


Barbosa T.M.,IPB | Morouco P.G.F.,Polytechnic Institute of Leiria | Jesus S.,Polytechnic Institute of Bragança | Feitosa W.G.,University of Fortaleza | And 4 more authors.
International Journal of Sports Medicine | Year: 2013

The aim of this study was to assess the relationship between the intra-cyclic variation of the horizontal velocity (dv) and the velocity of the 4 competitive swimming techniques in young swimmers. 45 young swimmers performed a set of maximal 4×25m (freestyle, backstroke, breaststroke and butterfly stroke) swims with in water start. A speed-meter cable was attached to the swimmers hip. The dv and the swimming velocity were analyzed. Within-subject tests presented significant variations in the dv based on the swimming technique. Post-hoc test revealed significant differences across all pair-wised swimming techniques (P<0.001), except for the comparison between freestyle and backstroke (P=0.98). The dv was higher in the breaststroke, followed by the butterfly, the backstroke and the freestyle. The quadratic models had the best goodness-of-fit and the lower error of estimation for the relationship between the dv and the swimming velocity in all swimming techniques (0.24R 20.51). As a conclusion, there is a non-linear relationship where the increase of swimming velocity leads to a decrease of dv in young competitive swimmers. © Georg Thieme Verlag KG Stuttgart · New York.


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.


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.


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.


Rifai N.,Bogor Agricultural University | Syaukat Y.,Bogor Agricultural University | Siregar H.,FEM IPB | Gumbira-Sa-Id E.,IPB
Journal of the International Society for Southeast Asian Agricultural Sciences | Year: 2015

The world palm oil production reached 55.7 million tons in 2013. Indonesia and Malaysia shared 86% of it with their production of 26.7 and 21.7 million tons, respectively. However, the volume of Indonesian palm oil export to USA was lower than that of Malaysia. Malaysian palm oil export had 96 percent market share, while Indonesia only had 3 percent market share in the USA. The aim of this study was to analyze the factors affecting the increased export of palm oil and its derivative products to the USA market. Annual time series data from 1992 to 2012 were used. Data were analyzed by using an econometric approach of Two Stages Least Squares (2SLS). Results showed that factors affecting the volume of export of palm oil and its derivative products to the USA market are USA CPO import, labour demand, USA economic growth, and Malaysian CPO production. Factors affecting an export price of Indonesian palm oil and its derivative products to the USA market are Indonesia economic growth, USA economic growth, Indonesian export taxes, Indonesian production value of agriculture sector, Malaysian CPO production, and Malaysian CPO export. © 2015, International Society for Southeast Asian Agricultural Sciences. All rights reserved.


PubMed | IPB and Vellore Institute of Technology
Type: Journal Article | Journal: Biotechnology journal | Year: 2016

A vast majority of the cardioprotective properties exhibited by High-Density Lipoprotein (HDL) is mediated by its major protein component Apolipoprotein A-I (ApoA1). In order to develop a simplified bioprocess for producing recombinant human Apolipoprotein A-I (rhApoA1) in its near-native form, rhApoA1was expressed without the use of an affinity tag in view of its potential therapeutic applications. Expressed in Pichia pastoris at expression levels of 58.2 mg ApoA1 per litre of culture in a reproducible manner, the target protein was purified by mixed-mode chromatography using Capto MMC ligand with a purity and recovery of 84% and 68%, respectively. ApoA1 purification was scaled up to Mixed-mode Expanded Bed Adsorption chromatography to establish an on-line process for the efficient capture of rhApoA1 directly from the P. pastoris expression broth. A polishing step using anion exchange chromatography enabled the recovery of ApoA1 up to 96% purity. Purified ApoA1 was identified and verified by RPLC-ESI-Q-TOF mass spectrometry. This two-step process would reduce processing times and therefore costs in comparison to the twelve-step procedure currently used for recovering rhApoA1 from P. pastoris.


Budi S.W.,IPB | Mansur I.,IPB | Kusmana D.C.,IPB
Pakistan Journal of Biological Sciences | Year: 2015

Arbuscular Mycorrhizal Fungi (AMF) are categorized as fungi which have symbioses with terrestrial plants and are distributed in various habitat types. The objectives of this research were to investigate the diversity of AMF m stands of kayu kuku (Pericopsis mooniana Thw.) in Southeast Sulawesi. Collection of samples of soil and root were conducted in six locations. Isolation of spores used the method of wet sieving and decanting, whereas AMF identification was conducted by observing morphology of AMF spores. Parameters of AMF diversity, namely species richness, diversity index, dominance index, evenness index and colonization were studied using method of infected root length. Research results showed that location differences affected significantly the spore density and parameters of AMP diversity, except colonization of AMF (p˂0.116). Location around the Governor office showed the highest number of spores (208.6 spores/100 g of soil). Soil chemical properties, such as C,N,P and heavy metal contributed towards AMF spore density and diversity. Soil C and N correlated negatively with spore density. In terms of location, Glomeraceae constituted the genera with the largest number of species and possessed wide distribution in all research locations. In general, natural forest has higher AMF diversity index (Shannon-Weiner diversity index-H’), evenness (E) and species richness (S) as compared with location of PT. Vale Indonesia Tbk. © 2015 Asian Network for Scientific Information.


PubMed | IPB
Type: Journal Article | Journal: International journal of sports medicine | Year: 2013

The aim of this study was to assess the relationship between the intra-cyclic variation of the horizontal velocity (dv) and the velocity of the 4 competitive swimming techniques in young swimmers. 45 young swimmers performed a set of maximal 4 25 m (freestyle, backstroke, breaststroke and butterfly stroke) swims with in water start. A speed-meter cable was attached to the swimmers hip. The dv and the swimming velocity were analyzed. Within-subject tests presented significant variations in the dv based on the swimming technique. Post-hoc test revealed significant differences across all pair-wised swimming techniques (P<0.001), except for the comparison between freestyle and backstroke (P=0.98). The dv was higher in the breaststroke, followed by the butterfly, the backstroke and the freestyle. The quadratic models had the best goodness-of-fit and the lower error of estimation for the relationship between the dv and the swimming velocity in all swimming techniques (0.24 R(2) 0.51). As a conclusion, there is a non-linear relationship where the increase of swimming velocity leads to a decrease of dv in young competitive swimmers.

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