Showing papers by "Simón Bolívar University published in 2009"
TL;DR: Results indicate that PET-filled concrete, when volume proportion and particle size of PET increased, showed a decrease in compressive strength, splitting tensile strength, modulus of elasticity and ultrasonic pulse velocity; however, the water absorption increased.
334 citations
TL;DR: In this paper, a review of the literature on the crystallization and morphology of biodegradable block copolymers with at least one crystallizable component is presented, focusing on double crystalline diblock copolymer.
223 citations
TL;DR: In this paper, the effect of water content on the glass transition temperatures of cassava starch was determined by differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA).
166 citations
TL;DR: It is found that it is impossible for a search strategy to retrieve 100% of the experiments of interest (as happens in other experimental disciplines), because of the shortage of reporting standards in the community.
Abstract: Our goal is to analyze the optimality of search strategies for use in systematic reviews of software engineering experiments. Studies retrieval is an important problem in any evidence-based discipline. This question has not been examined for evidence-based software engineering as yet. We have run several searches exercising different terms denoting experiments to evaluate their recall and precision. Based on our evaluation, we propose using a high recall strategy when there are plenty of resources or the results need to be exhaustive. For any other case, we propose optimal, or even acceptable, search strategies. As a secondary goal, we have analysed trends and weaknesses in terminology used in articles reporting software engineering experiments. We have found that it is impossible for a search strategy to retrieve 100% of the experiments of interest (as happens in other experimental disciplines), because of the shortage of reporting standards in the community.
165 citations
TL;DR: In this article, a nanocomposite sample was prepared by melt mixing a high density polyethylene (HDPE) with an in situ polymerized HDPE/multi wall carbon nanotube (MWNT) masterbatch.
Abstract: A nanocomposite sample was prepared by melt mixing a high density polyethylene (HDPE) with an in situ polymerized HDPE/multi wall carbon nanotube (MWNT) masterbatch. The nanocomposite had an approximate content of 0.52 wt % MWNT. Rheological, thermal, and mechanical properties were investigated for both neat HDPE and nanocomposite. The nanocomposite, when compared to the neat polymer, exhibits lower values of viscosity, shear modulus and shear stress in extrusion and a concurrent delay of the distortion regimes to higher shear stresses and rates. The nanocomposite presents also improved dimensional stability after processing, and lower values of the melt strength, draw ratio and viscosity in elongational flow. This behavior has been observed in composites in which an adsorption of a fraction (that with the highest molecular weight or relaxation time) of the polymer chains is considered. Furthermore, the enhancement in the crystallization kinetics, probed by rheometry and DSC, suggests that the carbon nano...
151 citations
Proceedings Article•
11 Jul 2009TL;DR: This work uses ideas advanced recently for compiling conformant problems into classical ones for introducing a different approach where contingent problems P are mapped into non-deterministic problems X(P) in state space, and identifies a contingent width parameter.
Abstract: The problem of planning in the presence of sensing has been addressed in recent years as a nondeterministic search problem in belief space. In this work, we use ideas advanced recently for compiling conformant problems into classical ones for introducing a different approach where contingent problems P are mapped into non-deterministic problems X(P) in state space. We also identify a contingent width parameter, and show that for problems P with bounded contingent width, the translation is sound, polynomial, and complete. We then solve X(P) by using a relaxation X+(P) that is a classical planning problem. The formulation is tested experimentally over contingent benchmarks where it is shown to yield a planner that scales up better than existing contingent planners.
131 citations
Proceedings Article•
11 Jul 2009TL;DR: This paper shows how to transform discounted PomDPs into Goal POMDPs, and uses the transformation to compare RTDP-Bel with point-based algorithms over the existing discounted benchmarks, and results appear to contradict the conventional wisdom in the area showing that RT DP-Bel is competitive, and sometimes superior to point- based algorithms in both quality and time.
Abstract: Point-based algorithms and RTDP-Bel are approximate methods for solving POMDPs that replace the full updates of parallel value iteration by faster and more effective updates at selected beliefs. An important difference between the two methods is that the former adopt Sondik's representation of the value function, while the latter uses a tabular representation and a discretization function. The algorithms, however, have not been compared up to now, because they target different POMDPs: discounted POMDPs on the one hand, and Goal POMDPs on the other. In this paper, we bridge this representational gap, showing how to transform discounted POMDPs into Goal POMDPs, and use the transformation to compare RTDP-Bel with point-based algorithms over the existing discounted benchmarks. The results appear to contradict the conventional wisdom in the area showing that RTDP-Bel is competitive, and sometimes superior to point-based algorithms in both quality and time.
128 citations
Proceedings Article•
19 Sep 2009
TL;DR: This work develops a method for deriving finite-state controllers automatically from models that represent a class of contingent problems where actions are deterministic and some fluents are observable, and converted into a conformant planning problem that is solved using classical planners.
Abstract: Finite-state and memoryless controllers are simple action selection mechanisms widely used in domains such as videogames and mobile robotics. Memoryless controllers stand for functions that map observations into actions, while finite-state controllers generalize memoryless ones with a finite amount of memory. In contrast to the policies obtained from MDPs and POMDPs, finite-state controllers have two advantages: they are often extremely compact, involving a small number of controller states or none at all, and they are general, applying to many problems and not just one. A limitation of finite-state controllers is that they must be written by hand. In this work, we address this limitation, and develop a method for deriving finite-state controllers automatically from models. These models represent a class of contingent problems where actions are deterministic and some fluents are observable. The problem of deriving a controller from such models is converted into a conformant planning problem that is solved using classical planners, taking advantage of a complete translation introduced recently. The controllers derived in this way are 'general' in the sense that they do not solve the original problem only, but many variations as well, including changes in the size of the problem or in the uncertainty of the initial situation and action effects. Experiments illustrating the derivation of such controllers are presented.
106 citations
TL;DR: Single and double strand break probabilities obtained here underestimate those reported by Friedland and co-workers by 20%-76% and 50%-60%, respectively, and some enhancements can be incorporated into the PENELOPE code to improve its results in the nanodosimetry field.
Abstract: The Monte Carlo (MC) method has been widely implemented in studies of radiation effects on human genetic material. Most of these works have used specific-purpose MC codes to simulate radiation transport in condensed media. PENELOPE is one of the general-purpose MC codes that has been used in many applications related to radiation dosimetry. Based on the fact that PENELOPE can carry out event-by-event coupled electron-photon transport simulations following these particles down to energies of the order of few tens of eV, we have decided to investigate the capacities of this code in the field of nanodosimetry. Single and double strand break probabilities due to the direct impact of {gamma} rays originated from Co{sup 60} and Cs{sup 137} isotopes and characteristic x-rays, from Al and C K-shells, have been determined by use of PENELOPE. Indirect damage has not been accounted for in this study. A human genetic material geometrical model has been developed, taking into account five organizational levels. In an article by Friedland et al. [Radiat. Environ. Biophys. 38, 39-47 (1999)], a specific-purpose MC code and a very sophisticated DNA geometrical model were used. We have chosen that work as a reference to compare our results. Single and double strand-breakmore » probabilities obtained here underestimate those reported by Friedland and co-workers by 20%-76% and 50%-60%, respectively. However, we obtain RBE values for Cs{sup 137}, Al{sub K} and C{sub K} radiations in agreement with those reported in previous works [Radiat. Environ. Biophys. 38, 39-47 (1999)] and [Phys. Med. Biol. 53, 233-244 (2008)]. Some enhancements can be incorporated into the PENELOPE code to improve its results in the nanodosimetry field.« less
105 citations
TL;DR: The stability of water-in-diluted-crude-oil emulsions is found to depend upon the water-phase salinity and the water−oil ratio for different asphaltene and demulsifier concentrations.
Abstract: The stability of water-in-diluted-crude-oil emulsions is found to depend upon the water-phase salinity and the water−oil ratio for different asphaltene and demulsifier concentrations. It is reported that the most stable emulsions are formed when one of the phase volumes largely exceeds the other and that the minimum stability is found at the formulation for which the emulsion inversion takes place. For asphaltene concentrations over 500 ppm, this occurs at a volumetric fraction between 0.3 and 0.7 and, in this range, the higher the water-phase content, the lower the required demulsifier concentration. It is also determined that there is an optimum value of the demulsifier concentration that promotes the fastest separation. At a fixed asphaltene concentration, an increase in salinity generally leads to a lower demulsifier requirement. Finally, at higher asphaltene concentrations, simultaneous increases in salinity and demulsifier concentration are required to attain an optimal rate of emulsion breaking.
87 citations
TL;DR: In this paper, a unified inverse-problem formulation using a multiproperty, multiscale model, linking properties statistically by petrophysical relationships and conditioning themtowell-log data is presented.
Abstract: Hydrocarbon reservoirs are characterized by seismic, welllog, and petrophysical information, which is dissimilar in spatial distribution, scale, and relationship to reservoir properties. We combine this diverse information in a unified inverse-problem formulation using a multiproperty, multiscale model, linking properties statistically by petrophysical relationships and conditioningthemtowell-logdata.Twoapproacheshelpus:1Markov-chainMonteCarlosampling,whichgeneratesmanyreservoir realizationsforestimatingmediumpropertiesandposteriormarginalprobabilities,and2optimizationwithaleast-squaresiterativetechniquetoobtainthemostprobablemodelconfiguration. Our petrophysical model, applied to near-vertical-anglestacked seismicdataandwell-logdatafromagasreservoir,includesadeterministic component, based on a combination of Wyllie and Wood relationships calibrated with the well-log data, and a random component, based on the statistical characterization of the deviations of well-log data from the petrophysical transform.At the petrophysical level, the effects of porosity and saturation on acoustic impedance are coupled; conditioning the inversion to well-log data helps resolve this ambiguity. The combination of well logs, petrophysics, and seismic inversion builds on the correspondingstrengthsofeachtypeofinformation,jointlyimproving 1 cross resolution of reservoir properties, 2 vertical resolution of property fields, 3 compliance to the smooth trend of property fields, and 4 agreement with well-log data at well positions.
TL;DR: The bacterium Burkholderia caribensis FeGL03, isolated from a Brazilian high-phosphorus iron ore, was used to mobilize the phosphate contained in the same ore as mentioned in this paper.
TL;DR: The first exact interior solution to Einstein's field equations for a static and nonuniform braneworld star with local and non-local bulk terms is presented in this paper, where it is shown that the Weyl scalar is always negative inside the stellar distribution, and in consequence it reduces both the effective density and the effective pressure.
Abstract: In this paper the first exact interior solution to Einstein's field equations for a static and nonuniform braneworld star with local and nonlocal bulk terms is presented. It is shown that the bulk Weyl scalar ${\cal U}(r)$ is always negative inside the stellar distribution, and in consequence it reduces both the effective density and the effective pressure. It is found that the anisotropy generated by bulk gravity effect has an acceptable physical behavior inside the distribution. Using a Reissner–Nordstrom-like exterior solution, the effects of bulk gravity on pressure and density are found through matching conditions.
TL;DR: Coral restoration strategies using 10–35 randomly selected local donor colonies will retain at least 50–90% of the genetic diversity of the original population, and restoration methods utilizing few clonal genotypes to re-populate a reef will diminish the genetic integrity of the population.
Abstract: Due to the importance of preserving the genetic integrity of populations, strategies to restore damaged coral reefs should attempt to retain the allelic diversity of the disturbed population; however, genetic diversity estimates are not available for most coral populations. To provide a generalized estimate of genetic diversity (in terms of allelic richness) of scleractinian coral populations, the literature was surveyed for studies describing the genetic structure of coral populations using microsatellites. The mean number of alleles per locus across 72 surveyed scleractinian coral populations was 8.27 (±0.75 SE). In addition, population genetic datasets from four species (Acropora palmata, Montastraea cavernosa, Montastraea faveolata and Pocillopora damicornis) were analyzed to assess the minimum number of donor colonies required to retain specific proportions of the genetic diversity of the population. Rarefaction analysis of the population genetic datasets indicated that using 10 donor colonies randomly sampled from the original population would retain >50% of the allelic diversity, while 35 colonies would retain >90% of the original diversity. In general, scleractinian coral populations are genetically diverse and restoration methods utilizing few clonal genotypes to re-populate a reef will diminish the genetic integrity of the population. Coral restoration strategies using 10–35 randomly selected local donor colonies will retain at least 50–90% of the genetic diversity of the original population.
TL;DR: In this paper, multiwalled carbon nanotubes (MWNTs) were functionalized with 2-hydroxyethyl benzocyclobutene (BCB-EO) through a Diels-Alder cycloaddition reaction.
Abstract: Multiwalled carbon nanotubes (MWNTs) were functionalized with 2-hydroxyethyl benzocyclobutene (BCB-EO) through a Diels–Alder cycloaddition reaction. The functionalized MWNTs were utilized for the surface initiated ring opening (ROP) catalyzed and anionic polymerization of e-caprolactone (e-CL) and ethylene oxide (EO), respectively. The kinetics of the ROP of e-CL was monitored through thermogravimetric analysis (TGA) which revealed that the polymerization proceeds very fast as compared to that of EO and that both polymerizations could be controlled with time. 1H NMR, Raman and FTIR spectroscopy, TGA, DSC, and transmission electron microscopy (TEM) were employed for the characterization of these polymer/CNT hybrids. DSC results showed that a remarkable nucleation effect is produced by MWNTs that reduced the supercooling needed for crystallization of both PeCL and PEO. Furthermore, the isothermal crystallization kinetics of the grafted PeCL and PEO was substantially accelerated compared to the neat polymers. The strong impact on the nucleation and crystallization kinetics is attributed to the covalent MWNT-polymer bonding. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 4379–4390, 2009
TL;DR: In this article, the Phenomenological Based Semi-physical Model (PBSM) is presented as a useful tool for the design, control and optimization of chemical and bio-technology processes.
Abstract: This work presents the Phenomenological Based Semi-physical Model (PBSM) as a useful tool for the design, control and optimization of chemical and bio-technology processes. First, a detailed description of a methodology to obtain a PBSM based on the knowledge of the basic principles of the process: mass, energy and momentum conservation, as well as gradient principle for obtaining model constitutive equations. The described methodology is applied to the clarification stage of a sugar cane refining plant. Specifically, the sulfitation tower is modelled step by step. The model is simulated and validated by comparing its behaviour with data taken from a real sulfitation tower.
TL;DR: This work proposes a solution algorithm where iteratively the authors solve relaxed models with a small number of inequalities, that provide upper bounds, and proposes exact separation procedures for generating violated cuts when possible and a simple heuristic to generate feasible solutions that provide lower bounds at each iteration.
TL;DR: In this article, the relationship between spall damage and local microstructure was investigated in multicrystalline copper samples via impact tests conducted with laser-driven plates at low pressures (2-6 GPa).
Abstract: Correlations between spall damage and local microstructure were investigated in multicrystalline copper samples via impact tests conducted with laser- driven plates at low pressures (2-6 GPa). The copper samples had a large grain size as compared to the thickness, which was either 200 or 1000mm, to isolate the effects of microstructure on the local response. Velocity interferometry was used to measure the bulk response of the free-surface velocity of the samples to monitor traditional spall tensile failure and to examine heterogeneities on the shock response due to microstructure variability from sample to sample. The shock pressure, dynamic yield strength and spall strength were determined from the measured velocity history via standard hydrodynamic approximations, while the effect of strength was explored via 1D hydrocode calculations. Electron Backscattering Diffraction, both in-plane and through-thickness, was used to relate crystallography to the presence of porosity around microstructural features such as grain boundaries and triple points. It was found that the dynamic yield strength measured from velocity histories in different samples correlated well with the crystallographic dependence reported for the dynamic yield strength in single crystals. Transgranular damage dominated in thin specimens with 230mm grain size, where porosity appeared close to, but not exactly at, grain boundaries. However, a transition to dominant intergranular damage was
TL;DR: In this paper, the thermally stimulated depolarization currents technique was used to study the miscibility of poly(dl-lactide) and poly(e-caprolactone) (PDLLA/PCL) blends in a wide composition range.
Abstract: The miscibility of poly(dl-lactide) and poly(e-caprolactone) (PDLLA/PCL) blends in a wide composition range was studied by the thermally stimulated depolarization currents technique by following the local and segmental dielectric relaxations changes as the blend composition is varied. The PCL primary relaxation is slightly shifted to higher temperatures as the PDLLA content increases, thus demonstrating the existence of a rich PCL phase and partial miscibility with PDLLA. Wide-angle X-ray scattering showed that neat PDLLA was amorphous, as expected for a sample with 12 mol % d-lactide isomer; nevertheless, the presence of 3D order was detected in the PDLLA that was melt blended with PCL. Differential scanning calorimetry also evidenced chain interaction by the decrease in the melting and crystallization temperatures as well as in the PCL crystallization kinetics which becomes slower in the presence of increasing amounts of PDLLA.
TL;DR: The most active compound to emerge from the in vitro and in vivo murine studies was 2b, suggesting an antimalarial activity via inhibition of hemoglobin hydrolysis, however, not as efficient as chloroquine.
TL;DR: In this article, the effect of water content on the glass transition temperatures of a ready to eat cereal formulation was determined, as well as for its major components, oat flour, rice flour and an oat-rice flour blend, in the same ratio as they are present in the formulation.
TL;DR: In this paper, the authors used the Clausius-Clapeyron equation to calculate the isosteric heat of oat flour and rice flour at 5, 23, and 45 °C using a gravimetric technique.
Abstract: Moisture sorption isotherms for oat flour and rice flour were determined at 5, 23, and 45 °C using a gravimetric technique in an aw range of 0.08–0.98. The results obtained showed that, for aw values lower than around 0.75, in both flours, the sorption capacity decreased with increasing temperature, while the opposite behavior was observed at aw greater than this value. It was found that the experimental data in the water activity range considered were better represented by the four-parameter Peleg equation. The monolayer water contents for both materials were determined by the BET and GAB models. The net isosteric heats of sorption were estimated using the Clausius–Clapeyron equation. For both materials, the monolayer water content and the isosteric heat of sorption were found to decrease with increasing temperature and increasing moisture content, respectively.
TL;DR: In the context of the Randall-Sundrum braneworld, an exhaustive and detailed description of the approach based in the minimal anisotropic consequence onto the brane is carefully presented in this paper.
Abstract: In the context of the Randall-Sundrum braneworld, an exhaustive and detailed description of the approach based in the minimal anisotropic consequence onto the brane, which has been successfully used to generate exact interior solutions to Einstein's field equations for static and non-uniform braneworld stars with local and non-local bulk terms, is carefully presented. It is shown that this approach allows the generation of a braneworld version for any known general relativistic solution.
TL;DR: In this paper, the adsorption equilibrium constants of p -nitrophenol (PNP) on the TiO 2 surface at different pH values have been obtained from Langmuir isotherms and from a plot of 1/rate vs 1/[PNP] o obtained during the photo-degradation of PNP.
Abstract: We have obtained p K a values of p -nitrophenol–TiO 2 by measuring the adsorption equilibrium constants of p -nitrophenol (PNP) on the TiO 2 surface at different pH values These values have been obtained from Langmuir isotherms and from a plot of 1/rate vs 1/[PNP] o obtained during TiO 2 catalyzed solar light photo-degradation of PNP Two limit equilibrium constants are readily obtained depending on the solution pH: at pH 5 at which the TiO 2 surface is mainly positively charged and at pH 8 when it is negatively charged With these and other adsorption equilibrium constants and the PNP p K a value in solution, thermodynamic cycles are established in order to obtain the PNP p K a when it is adsorbed on positively charged, neutral and negatively charged TiO 2 surfaces From these p K a values useful information on the PNP–TiO 2 interaction is readily obtained For instance, the PNP nitro group interacts with the TiO 2 surface via a hydrogen bond, arising from the complex of water molecules with the Ti 4+ ions on its surface The weaker the hydrogen bond donor, the stronger the oxygen nitro group basicity Therefore, p K a changes on the phenolic hydroxyl group result from these interactions Linear free energy correlations, maximum PNP adsorption capacity values ( Q L ) and FTIR ATR, spectrum support this proposal A k obs vs pH degradation profile of p -nitrophenol is also provided
TL;DR: In this paper, a set of experimental tests were conducted to investigate the influence of the angle formed between the major axis of the expanded metal and the compressive load, and three types of collapse response were mainly observed depending on the orientation of the axes.
Abstract: Expanded metal sheeting is widely used around the world for catwalks, granting, and decorative purposes. In the literature, little information can be found regarding the behavior of structural elements made of expanded metal. This paper is aimed at studying the axial collapse of squared and round tubes made of expanded metal sheeting under compressive loading. When expanding the metal a diamond-like cell pattern is formed in the metal sheets, then these patterns are characterised by two geometrical axes. A set of experimental tests was conducted to investigate the influence of the angle formed between the major axis of the expanded metal and the compressive load. From the results, three types of collapse response were mainly observed depending on the orientation of the axes: (1) Mode 1 characterised by a plastic collapse mechanism; (2) Mode 2 local buckling of the individual cells; and (3) Mode 3 global buckling of the tube walls.
TL;DR: In this article, the thermodynamics of the so-called perfectly polarizable electrode were employed to analyze the total charge densities for a nearly defect-free Pt(1 1 1 1 ) electrode in a series of NaH2PO4 solutions with an excess of inert electrolyte (0.1 m HClO4) at constant ionic strength and pH.
TL;DR: In this article, the Successive Self-nucleation and Annealing (SSA) thermal fractionation technique is briefly reviewed to highlight recent advances such as the use of high speed DSC concepts to perform faster fractionation.
Abstract: The Successive Self-nucleation and Annealing (SSA) thermal fractionation technique is briefly reviewed to highlight recent advances such as the use of high speed DSC concepts to perform faster fractionation. Additionally, recent applications of SSA to characterize confined semi-crystalline model polyethylenes in block copolymer nanophases and in situ prepared nanocomposites with carbon nanotubes are also reviewed. A novel result presented here deals with the use of a macromolecular plasticizer to improve the quality of SSA thermal fractionation.
TL;DR: In this article, two types of poly(epsilon-caprolactone) copolymers were prepared by catalyzed hydrolytic ring-opening polymerization, and they were characterized by differential scanning calorimetry (DSC), wide and small-angle X-ray scattering (WAXS and SAXS), and transmission and scanning electron microscopies (TEM and SEM).
Abstract: Two types of poly(epsilon-caprolactone (CLo)-co-poly(epsilon-caprolactam (CLa)) copolymers were prepared by catalyzed hydrolytic ring-opening polymerization. Both cyclic comonomers were added simultaneously in the reaction medium for the First type or materials where copolymers have a random distribution of counits, as evidenced by H-1 and C-13 NMR. For the second type of copolymers, the cyclic comonomers were added sequentially, yielding diblock poly(ester-amides). The materials were characterized by differential scanning calorimetry (DSC), wide- and small-angle X-ray scattering (WAXS and SAXS), and transmission and scanning electron microscopies (TEM and SEM). Their biodegradation in compost was also studied. All copolymers were found to be miscible by the absence of structure in the melt. TEM revealed that all samples exhibited a crystalline lamellar morphology. DSC and WAXS showed that in a wide composition range (CLo contents from 6 to 55%) only the CLa units were capable of crystallization in the random copolymers. The block copolymer samples only experience a small reduction of crystallization and melting temperature with composition, and this was attributed to a dilution effect caused by the miscible noncrystalline CLo units. The comparison between block and random copolymers provided a unique opportunity to distinguish the dilution effect of the CLo units on the crystallization and melting of the polyamide phase from the chemical composition effect in the random copolymers case, where the CLa sequences are interrupted statistically by the CLo units, making the crystallization of the polyamide strongly composition dependent. Finally, the enzymatic degradation of the copolymers in composted soil indicate a synergistic behavior where much faster degradation was obtained for random copolymers witha CLo content larger than 30% than for neat PCL.
TL;DR: In this article, a linear low density polyethylene/starch (LLDPE/S) blends were prepared employing succinylated starches (S-g-OSA) as compatibilizers.
TL;DR: The designed medium is simple, easy to prepare and allows a low-cost strategy to obtain a high quality in vitro micropropagated cassava plants and its ready availability may have an impact on the production of planting material of cassava.
Abstract: With the aim of transferring micropropagation techniques to cassava seed producers, a simple and lowcost medium for in vitro micropropagation was developed. CM6740-7 cassava cultivar from CIAT was used as planting material. Commercially available nutrients were used in order to substitute the propagation media components. A Hydro Agri´s fertilizer (12-11-18/3 (MgO-EDTA)) was used as a substitute for Murashige and Skoog macro and micronutrients. Additionally, table sugar and molasses were used as a source of carbohydrates and vitamins. Radixone 3AS from Praquim C.A. was used as a source of auxins and activol as a source of gibberellic acid. Numbers of roots and leaves, height and dry weight of plantlets was determined for each treatment and compared with a conventional micropropagation media. For all the parameter measured, the plantlets obtained on the fully substituted media showed a good growth performance. Canonical biplot analysis showed that this media was especially good for the number of nodes (multiplication rate) in 60-day-old cultured plants. The designed medium is simple, easy to prepare and allows a low-cost strategy to obtain a high quality in vitro micropropagated cassava plants and its ready availability may have an impact on the production of planting material of cassava.