Listar Artículos de investigación por título
Mostrando ítems 169-188 de 248
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On nearly S-paracompactness
(BarranquillaMatemáticasSede Norte, 2021-08-12)- The objective of the present work is to introduce the notion of α-nearly S-paracompact subset, which is closely related to α-nearly paracompact and αS-paracompact subsets. Moreover, we study the invariance under direct ...
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On Soft b-w-Open Sets
(BarranquillaMatemáticasSede Norte, 2020-06-13)In this paper, it used the notions of soft ω-open sets to introduce and study the concepts of soft b-ω-open sets. Moreover, some of their properties are shown. Furthermore, the concepts of soft b-T1 and soft b-T2 spaces ...
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Optical limiting phenomenon study in oils of vegetable origin
(BarranquillaLicenciatura en MatemáticasSede Norte, 2020-12-31)The optical limiting effect was analyzed in two oils of vegetable origin, extra virgin olive oil and virgin avocado oil; which are materials that have a large amount of organic components and excellent physicochemical ...
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Optimization and Preliminary Physicochemical Characterization of Pectin Extraction from Watermelon Rind ( Citrullus lanatus) with Citric Acid
(BarranquillaIngeniería MecánicaSede Norte, 2022-01-06)Watermelon rind was used for the pectin extraction with citric acid as the extractant solvent. The effects of pH (2.0-3.0), extraction time (45-75 min), and liquid-solid ratio (10 : 1 to 40 : 1 mL/g) on the pectin yield, ...
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Optimization by Central Composite Experimental Design of the Synthesis of Physically Crosslinked Chitosan Spheres
(BarranquillaQuímicaSede Norte, 2020-11-20)Chitosan (CS) has special properties such as biocompatibility, biodegradability, antibacterial, and biological activity which make this material is currently studied in various applications, including tissue engineering. ...
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Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology
(BarranquillaQuímicaSede Norte, 2021-01-25)The use of dyes at an industrial level has become problematic, since the discharge of dye effluents into water disturbs the photosynthetic activity of numerous aquatic organisms by reducing the penetration of light and ...
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Optimization of mechanical and setting properties in acrylic bone cements added with graphene oxide
(BarranquillaIngeniería QuímicaSede Norte, 2021-06-03)The extended use of acrylic bone cements (ABC) in orthopedics presents some disadvantages related to the generation of high temperatures during methyl methacrylate polymerization, thermal tissue necrosis, and low mechanical ...
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Osseointegration of Antimicrobial Acrylic Bone Cements Modified with Graphene Oxide and Chitosan
(BarranquillaSede Norte, 2020-09-18)Acrylic bone cement (ABC) is one of the most used materials in orthopedic surgery, mainly for the fixation of orthopedic implants to the bone. However, ABCs usually present lack of biological activity and osseointegration ...
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Packham’s Triumph Pears (Pyrus communis L.) Post-Harvest Treatment during Cold Storage Based on Chitosan and Rue Essential Oil
(BarranquillaIngeniería AgroindustrialSede Norte, 2021-01-30): Pears (Pyrus communis L.) cv. Packham’s Triumph are very traditional for human consumption, but pear is a highly perishable climacteric fruit with a short shelf-life affected by several diseases with a microbial origin. ...
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Parametric Analysis CFD of the Hydraulic Performance of a Centrifugal Pump with Applications to the Dredging Industry
(BarranquillaIngeniería MecánicaSede Norte, 2020-01-20)The present study aims to use the analysis of CFD in a centrifugal dredge pump, to predict by mathematical correlations the effect that changes in the main variables of the dredging process would have on the behavior and ...
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Parametric Analysis of a Mechanical Draft Cooling Tower using Two Mathematical Models
(BarranquillaIngeniería QuímicaSede Norte, 2021-06-25)In the present work, a Matlab® computer code for cooling tower simulation was developed to perform a parametric analysis that determines the effect of the column cross-sectional area on multiple operating variables such ...
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Pasting and Dough Rheological Properties of Ackee (Blighia sapida) Aril Flour: A Contribution to the Search for Wheat Flour Substitutes
(BarranquillaIngeniería AgroindustrialSede Norte, 2021-04-26)Wheat is one of the most widely used cereals in the world. However, studies consider wheat flour doughs to be of low nutritional quality, as there is now greater public awareness of celiac disease and gluten intolerance. ...
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Performance assessment and economic perspectives of integrated PEM fuel cell and PEM electrolyzer for electric power generation
(BarranquillaIngeniería MecánicaSede Norte, 2020-12-07)The study presents a complete one-dimensional model to evaluate the parameters that describe the operation of a Proton Exchange Membrane (PEM) electrolyzer and PEM fuel cell. The mathematical modeling is implemented in ...
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Performance of Equilibrium FCC Catalysts in the Conversion of the SARA Fractions in VGO
(BarranquillaSede Norte, 2020-10-23)Two equilibrium FCC catalysts of the octane-barrel (ECAT-D) and resid (ECAT-R) types were used in the cracking of a typical vacuum gasoil (VGO) and its saturated (SF), aromatic (AF), and resin (RF) fractions. The experiments ...
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Photophysical study and in vitro approach against Leishmania panamensis of dicloro-5,10,15,20-tetrakis(4- bromophenyl)porphyrinato Sn(IV)
(BarranquillaSede Norte, 2021-11-08)Background: Photodynamic therapy activity against different biological systems has been reported for porphyrins. Porphyrin modifications through peripheral groups and/or by metal insertion inside the ring are main ...
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Physical-chemical study of anthracene selective oxidation by a Fe(III)-phenylporhyrin derivative
(BarranquillaSede Norte, 2019-10-30)In this work, we studied the anthracene oxidation by hydroxyl radicals. Hydroxyl radical was generated by reaction of 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin Fe (III) (TPPFe) with hydrogen peroxide under visible ...
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Phytochemical Screening of Callus and Cell Suspensions Cultures of Thevetia peruviana
(BarranquillaQuímicaSede Norte, 2020-02-13)Thevetia peruviana is an ornamental shrub grown-up in many tropical region of the world. This plant produces secondary metabolites with biological properties of interest for the pharmaceutical industry. The objective was ...
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Pilot-Scale Anaerobic Digestion of Pig Manure with Thermal Pretreatment: Stability Monitoring to Improve the Potential for Obtaining Methane
(BarranquillaIngeniería MecánicaSede Norte, 2022-08-13)Monitoring and controlling stability in anaerobic digestion (AD) systems are essential, since it allows to obtain information that helps to take corrective actions in case of deviations in the system and to guarantee a ...
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Planificación estratégica situacional: Un proceso metódico-práctico
(BarranquillaSede Norte, 202-01-20)La planificación situacional asume la crítica de la planificación tradicional, por su incapacidad de producir cambios, siendo de auto referencia del hombre de acción, que en última instancia debe resolver problemas ...
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Predicting the Adsorption of Amoxicillin and Ibuprofen on Chitosan and Graphene Oxide Materials: A Density Functional Theory Study
(BarranquillaQuímicaSede Norte, 2021-05-13)The occurrence, persistence, and accumulation of antibiotics and non-steroidal antiinflammatory drugs (NSAIDs) represent a new environmental problem due to their harmful effects on human and aquatic life. A suitable absorbent ...