TECCIENCIA最新文献

{"title":"Cyanide Degradation from Mining Effluent Using Two Reagents: Sodium Metabisulphite and the Metabisulphite Mixture with Hydrogen Peroxide","authors":"Gonzalo Aranguri Llerena, Iván Alberto Reyes López","doi":"10.18180/TECCIENCIA.2018.25.1","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2018.25.1","url":null,"abstract":"Cyanide ion (CN-) is widely used in different industrial operations, such as jewelry, steel manufacture, gold and silver extraction and electroplating. However, industrial emissions containing the CN- ion have to be treated to comply with environmental regulations. This research aimed to degrade free cyanide (CNL) present in the tailing of a metallurgical plant that processes gold-bearing ores and uses sodium cyanide (NaCN) as a leaching reagent.  Sodium metabisulfite (Na2S2O5) and sodium metabisulfite with hydrogen peroxide  (Na2S2O5 + H2O2) were used as oxidizing agents. To evaluate the effect of the factors, we used a factorial design with three independent variables: stirring time, reagent excess percentage, type of reagent and a dependent variable: CNL degradation (mg/L). According to the analysis of variance (ANOVA), the variables influenced significantly CNL degradation, being the most relevant the reagent excess percentage and according to the results, the maximum CNL degradation was 97.67% when 400% of Na2S2O5excess was added with 4 hours of stirring.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49040381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Programming of Job Shop Production Systems with Fuzzy Logic","authors":"Luis Eduardo Leguizamon Castellanos","doi":"10.18180/TECCIENCIA.2018.25.5","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2018.25.5","url":null,"abstract":"This article proposes a decision-making algorithm based on the \"fuzzy logic\" as an optimization technique, which allows to find a good solution to the problem of determining the priority (sequencing) of service or manufacture of jobs in the programming of intermittent production systems, Job Shop. The combinatorial nature and complexity of the problem motivates the exploration of other alternatives solutions to the traditionally used. Initially, the fuzzy logic controller structure (number of input variables, rules and output) is determined in accordance with the objective functions to be optimized. Triangular membership functions are selected for the batch size, the delivery date, the processing time, the number of tools required in each operation, and the priority of the processing the jobs. The fuzzy rules base is defined, and the controller model is formulated (fuzzification, evaluation and defuzzification). The algorithm is developed in Matlab’s ®Simulink ®Fuzzy logic toolbox, achieving better results than those obtained with other methods.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67507866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methodological Proposal to Correct and Adjust a Geodesic Leveling Data","authors":"José Ricardo Guevara-Lima, Sandra Milena González-Giraldo, Juan Sebastián Sánchez-Cárdenas","doi":"10.18180/TECCIENCIA.2019.26.3","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2019.26.3","url":null,"abstract":"","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43068895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterizing the Mechanical Properties of Steel AISI-SAE 4140 to Apply a Plasma Nitriding Process","authors":"Giovanny Andres Olaya Esparragoza, Adrian Guerrero Galvis, aldrin belisario velosa pacheco","doi":"10.18180/TECCIENCIA.2018.24.8","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2018.24.8","url":null,"abstract":"Surface treatments give physical and chemical properties to the materials, without them showing any change in their dimensions. Plasma nitriding is a thermochemical treatment, which increases some mechanical properties of metallic materials. In this article the characterization of the mechanical and micro-structural properties of an AISI-SAE 4140 steel is presented. To carry out the metallographic characterization, stress, hardness, abrasive wear and X-ray diffraction tests, the AISI-SAE 4140 steel was mechanized and prepared delivered in a hardened state (quenched and tempered) produced by Shah Alloys Ltd. making test pieces with their corresponding ASTM standards and nitrifying by plasma half of these at 500oC for 10 hours. A thickness of 6.78 μm was obtained from the nitride layer that the material acquired. A microstructural constitution was found formed by martensite and austenite retained in the base material, maintaining the same structure with the thermochemical process. The nitrided surface showed in its atomic chemical composition (At%) the presence of 8.04% N, 1.69% O and 1.38% Al (element of great importance to achieve great hardness), revealing an increase of 18.55% of surface hardness and 78.87% of wear resistance. Regarding the tensile properties, there is a 77.65% decrease in its elongation when subjected to medium and low tensile loads, presenting a deformation of 0.09 mm for the last stress effort of 600 MPa.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44810939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANTICORROSIVE PROPERTIES OF CHROMIUM COATINGS ON AISI H13 STEEL BY GASEOUS NITRIDING IN VACUUM","authors":"J. Olaya, H. Cifuentes","doi":"10.18180/TECCIENCIA.2018.24.5","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2018.24.5","url":null,"abstract":"This paper shows the results of this process through the performance of a duplex treatment that combines the application a single chromium hard coating Cr(VI) on a AISI H13 steel with a thermochemical treatment of vacuum gas nitriding. The thickness of the electroplated coating was 15 μm, and N2 was used as precursor gas, with a flow of 100 ml/min at a pressure of 1.2 kPa to produce a CrxNy coating. The existing phases were determined by means of X-ray diffraction, and the corrosion resistance was evaluated via potentiodynamic polarization and electrochemical impedance spectroscopy techniques in a three-electrode electrochemical cell. Characterization via XRD determined the presence of chromium nitrides of type Cr2N, with an important orientation along the plane (300) associated with the partial pressure of N2 and the thermodynamic behavior. The corrosion resistance results showed a significant decrease in the corrosion current density compared with those exhibited by samples chromed by electroplating with AISI H13 steel without nitriding. These results, coupled with the sealing of characteristic microcracks of the electroplated chrome coating, could improve the corrosion resistance, because of the existence of the CrxNy phase.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42427079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Climate Change on Rainfall in the Upper Basin of Chicamocha River in 1980-2012","authors":"L. Garavito, Carlos Andrés Caro Camargo","doi":"10.18180/TECCIENCIA.2018.24.9","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2018.24.9","url":null,"abstract":"Indications suggest that anthropic activities have altered the atmospheric composition, causing alterations in elements generating extreme weather events and contributing to what we know today as global warming, through global and local changes in the rain regime and other climatic variables that interact in the hydrological cycle, causing extreme events with greater frequency. It is necessary to know the trends and extreme events of rains in order to have a basis for the adaptation and prevention of natural disasters caused by these macroclimatic phenomena. Through non-parametric tests, we found an increasing trend in rainfall between 5% to 20% average, in comparison with the behavior in the period of 1980 to 1990. Similarly, the influence of the macroclimatic variables in rainfall behavior is null.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42444192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical Characterization of Breast Implants Submitted to High Energy X-Rays","authors":"Sandra Leiva, M. Plazas, L. Barretto","doi":"10.18180/tecciencia.2019.26.8","DOIUrl":"https://doi.org/10.18180/tecciencia.2019.26.8","url":null,"abstract":"Based on clinical experience and various studies, it has been found that breast prostheses present failures that are related to a radiotherapy treatment. However, there are currently few studies that analyze the impact of radiotherapy on the material of the prosthesis. Accordingly, the aim of this paper is to characterize the material of silicone breast implants with high cohesiveness. In order to carry out the research a characterization based on mechanical tests, rheology, and spectrophotometry and scanning electron microscopy. This was done with the objective of identifying changes in the prosthesis before and after being irradiated with high energy x-ray photons. To perform the study, 4 breast implants were used. These implants were subjected to the aforementioned tests. The researcher repeated the observation in the second and the third month. Finally, when comparing the results, the mechanical changes are shown in the coating. In the internal material small changes were generated in the elastic and viscous modules. To conclude, effective changes were observed after radiotherapy treatment in the prosthetic material.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48787002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"se of Biofuels in the Aeronautical Industry. Case of the Colombian Air Force.","authors":"M. Mayorga, Juan Guillermo Cadavid Estrada, J. Páez, C. L. Santamaría, M. Gómez","doi":"10.18180/TECCIENCIA.2019.26.7","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2019.26.7","url":null,"abstract":"The present work makes a review of the uses of biofuels in the aeronautical industry, considering military aviation. The state of the art contemplates researches for the production and characterization of the different alternatives that can partially or totally replace fossil fuels of aviation, aiming to reduce the emissions of greenhouse gases. In the local case, through the development of a research project endorsed by Colciencias, the use of biofuels for aircraft engines has been evaluated. In the first phase, ground tests were carried out to justify and present the results of the options considered. In this way, an outline is made of the production of biokerosene and FAME produced at laboratory level, as well as the inherent challenges to incorporate these two biofuels in mixtures with Jet Fuel in a commercial level for the national scope","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42316090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-Agent System Used for Recommendation of Historical and Cultural Memories","authors":"Nancy Yaneth Gelvez García, Andrés David Ballén Duarte, H. E. E. Cuchango","doi":"10.18180/TECCIENCIA.2019.26.6","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2019.26.6","url":null,"abstract":"espanolEn el presente documento se realiza la propuesta de un sistema de recomendacion basado en multi-agentes que permite analizar el comportamiento de un usuario cuando este visualiza memorias historicas y culturales, ofreciendo recorridos recomendados mediante las calificaciones y tiempos de duracion al observar las obras de arte. Tambien se muestra la arquitectura del sistema, el servidor utilizado para el desarrollo del sistema multiagente, asi como la comunicacion entre agentes necesarias para llevar a cabo un recorrido recomendado y la funcionalidad requerida para sugerir los nuevos recorridos a un usuario. El sistema multiagente utiliza una red neuronal que permite analizar el comportamiento de un usuario en un recorrido; mediante la retroalimentacion por la red neuronal se verifican los datos estableciendo los gustos del usuario. Para generar las recomendaciones se uso un dataset de informacion de memorias historicas y culturales, como tambien un api para el almacenamiento de usuarios. Para la visualizacion del funcionamiento del sistema, este prototipo se conecto con un aplicativo de realidad aumentada que permite a los usuarios acceder a las obras de arte y utilizar preferencias predefinidas EnglishIn this document the proposal of a recommendation system based on multi agent is made allowing the analysis of user behavior when visiting historical and cultural memories, giving recommendations based on qualifications and duration times for the observation of art pieces. It is also possible to see the system architecture, the server used for the development of the multiagent system, as well as the communication between agents to carry out a route, and the functionality for recommending new routes to a user. The multi-agent system uses a neural network that allows to analyze the behavior of a user in a route; using the feedback given for the neural network the data is checked, allowing determine the user preferences. A set of historical and cultural memory data set is used to generate recommendations; in addition, a user storage API is employed. For the system visualization, this prototype is connected with an augmented reality application that allows users access to visit art pieces and use predefined preferences","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48282133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Green inorganic pigment production with spinel structureCoCr2O4by solution combustion synthesis","authors":"E. A. Miranda, Alex Arbey Lopera Sepúlveda, Juan Fernando Montoya Carvajal, Stiven Villada Gil, Ó. R. Baena","doi":"10.18180/TECCIENCIA.2019.26.5","DOIUrl":"https://doi.org/10.18180/TECCIENCIA.2019.26.5","url":null,"abstract":"In this research, inorganic pigment with spinel structure CoCr 2 O 4 was synthesized by the solution combustion synthesis using glycine as fuel in an one-step. The powders as-prepared after combustion and then calcined at 700 °C during 6 hours, were characterized by the X-ray diffraction (XRD), and both samples showed the peaks corresponding to the expected spinel structure. which showed that the spinel structure was obtained in the combustion reaction.  Images of field emission scanning electron microscope (FE-SEM) showed the formation of porous and agglomeration of particles with, irregular shape. Finally, diffuse reflectance visible spectra were showed with an absorption band in the range of 570 nm -670 nm, which is due to electronic transitions corresponding to 4 A 2 (F) → 4 T 1 (P) when the cation of Co 2+ in tetrahedrical position and electronic transitions 4 A 2g → 4 T 2g of Cr 3+ in octaedrical positions. Color coordinates CIEL*a*b* correspond to a green color, which is consistent with the diffuse reflectance spectra.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42697924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}