Revista Facultad De Ingenieria-universidad De Antioquia最新文献_第10页

Implementation of an electromagnetic system for controlling resistance and speed in indoor cycling 一种控制室内自行车阻力和速度的电磁系统的实现

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-05-20 DOI: 10.19053/01211129.v27.n48.2018.7982

Jairo A. Moreno-González, A. Alarcón-Aldana, M. Callejas-Cuervo

引用次数: 0

Morphology, mechanical strength and degradation of polyhydroxyalkanoate scaffolds 聚羟基烷酸酯支架的形态、机械强度和降解

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-05-05 DOI: 10.19053/01211129.V27.N48.2018.8073

Liliana María Arroyave-Muñoz, C. P. Ossa-Orozco

{"title":"Morphology, mechanical strength and degradation of polyhydroxyalkanoate scaffolds","authors":"Liliana María Arroyave-Muñoz, C. P. Ossa-Orozco","doi":"10.19053/01211129.V27.N48.2018.8073","DOIUrl":"https://doi.org/10.19053/01211129.V27.N48.2018.8073","url":null,"abstract":"Tissue engineering (TE) seeks to improve the unsatisfactory development of implants and medical procedures to solve bone and cartilage injuries. TE aims at regenerating tissues using cell growth platforms (scaffolds), which may consist of natural polymers such as polyhydroxyalkanoate (PHA). PHA is an innovative material useful in medical applications due to its degradation capability and bacterial origin that allows large-scale production and control final properties. In this research, we developed commercial PHA scaffolds using the lyophilization technique with a factorial experimental design. We used dichloromethane as PHA solvent, tergitol as surfactant, and liquid nitrogen (N 2 ) for the freezing process. We characterized the PHA by Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA); and the scaffolds by scanning electron microscopy (SEM) and mechanical compression and hydrolysis degradation tests. The characterization of the PHA indicated that the material is a mixture of PHA and polylactic acid (PLA). The results showed a suitable pore distribution for migration of chondrocytes through the scaffold, in addition to a behavior similar to that of the articular cartilage, although it presented lower mechanical strength. Also, the scaffolds displayed mass loss in a non-linear way related to the percentage of PHA present in the sample. In conclusion, PHA scaffolds have a potential use in tissue engineering for restoring articular cartilage.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86114303","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}

引用次数: 0

Degradation, water uptake, injectability and mechanical strength of injectable bone substitutes composed of silk fibroin and hydroxyapatite nanorods 由丝素蛋白和羟基磷灰石纳米棒组成的可注射骨替代物的降解、吸水、注射性和机械强度

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-05-05 DOI: 10.19053/01211129.V27.N48.2018.8072

Maritza Buitrago-Vásquez, C. P. Ossa-Orozco

{"title":"Degradation, water uptake, injectability and mechanical strength of injectable bone substitutes composed of silk fibroin and hydroxyapatite nanorods","authors":"Maritza Buitrago-Vásquez, C. P. Ossa-Orozco","doi":"10.19053/01211129.V27.N48.2018.8072","DOIUrl":"https://doi.org/10.19053/01211129.V27.N48.2018.8072","url":null,"abstract":"Injectable bone substitutes are generally composite materials capable of being extruded through a device; they consist of a solid phase inside a matrix that allows the easy movement of particles. Injectable bone substitutes have the advantage of allowing its application in situ without the need of invasive surgical techniques, guaranteeing a good recovery; for this reason, they are a promising alternative to replace conventional techniques to repair bone defects. Conventional techniques include the use of allografts and autografts, which often cause adverse reactions, and are disadvantageous for both the patient and the doctor. Furthermore, there are no reports regarding bone substitute development in Colombia, creating the necessity to research composite materials that could become injectable bone substitutes. In this study, we manufactured injectable bone substitutes with hydroxyapatite and calcium phosphate, which is most similar to bone tissue, and synthesized them in nanorods with shape and size similar to the natural hydroxyapatite found inside the body. Additionally, we used extracted silk fibroin from silkworm cocoons of Bombyx mori , a natural polymer of protein nature with high mechanical properties and excellent biocompatibility. For the materials manufactured, we evaluated degradation, in a simulated body fluid (SBF) at normal body temperature, water uptake, injectability and mechanical strength. The manufactured bone substitutes showed good degradation and water uptake properties, an approximate 97% injectability, and low mechanical resistance, indicating promising properties to be used as an injectable bone substitute.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73018854","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}

引用次数: 6

Night air conditioning of buildings by external air ventilation 建筑物的夜间空调采用外部通风

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-05-04 DOI: 10.19053/01211129.V27.N48.2018.8071

Debrayan Bravo-Hidalgo

{"title":"Night air conditioning of buildings by external air ventilation","authors":"Debrayan Bravo-Hidalgo","doi":"10.19053/01211129.V27.N48.2018.8071","DOIUrl":"https://doi.org/10.19053/01211129.V27.N48.2018.8071","url":null,"abstract":"Buildings contain the environment in which almost all human activities take place, and therefore, nowadays, they represent a great sink of energy. Establishing thermal comfort conditions within these buildings is responsible for a large portion of their energy demand. This paper aims at providing a theoretical framework of the performance and the trends in research and implementation of night air conditioning by outside air ventilation. The bibliographic search was conducted in the academic directory Scopus, and the information extracted was processed in the VOSviewer software, through which text mining, map of terms and networks of investigative action were carried out. The literature showed that direct ventilation has a more significant cooling potential in regions characterized by a high difference between day and night air temperatures. The effectiveness of night cooling and the reliable prediction of thermal behavior are strongly related to the model adopted for the convection algorithm. A reliable prediction of heat transfer by convection requires an approach based on computational simulations of fluid dynamics, which are much more demanding in terms of computational power, compared to simulations of the variation of energy flows as a function of time. Most studies showed that the position of the thermal mass is not significant, while the amount of ventilation air is of great importance. In particular, the energy demand for cooling a building decreases sharply if the air flow rates increase.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84754744","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}

引用次数: 4

Design of longitudinal finned tubes adjusted with the Cesàro curve 用Cesàro曲线调整纵向翅片管的设计

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-05-01 DOI: 10.19053/01211129.V27.N48.2018.8104

Luis Eduardo Llano-Sánchez, L. C. Ruiz, D. Domínguez-Cajeli, Martha Cecilia Melo-de-Alonso

引用次数: 2

Hydrogeochemical characterization and identification of a system of regional flow. Case study: the aquifer on the Gulf of Urabá, Colombia 区域流系统的水文地球化学特征与识别。案例研究:哥伦比亚乌拉布<e:1>湾的含水层

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-03-27 DOI: 10.17533/UDEA.REDIN.N86A02

Juliana Ossa-Valencia, Teresita Betancur-Vargas

{"title":"Hydrogeochemical characterization and identification of a system of regional flow. Case study: the aquifer on the Gulf of Urabá, Colombia","authors":"Juliana Ossa-Valencia, Teresita Betancur-Vargas","doi":"10.17533/UDEA.REDIN.N86A02","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A02","url":null,"abstract":"Hydrogeochemistry is an essential tool for the verification of conceptual models, especially of groundwater flow models. This is even more relevant when dealing with complex hydrogeological models that have intercalating layers with different degrees of permeability, and regional flows contributing to the system. The hydrogeochemical characteristics of the Uraba-Colombia Aquifer and geological cross-sections were studied to establish possible processes that explain the groundwater flow evolution and the recharge zones. 4 flow lines were considered to show the groundwater evolution from Ca2+-HCO3 - facies and a TDS concentration of approximately 400 mg/L, trough Ca2+-Mg2+-HCO3 - and Na+ -Mg2+-HCO3 - facies, ending with Na+ -HCO3 - facies close to discharge area, with TDS=1,550 mg/L. Data on stable isotopes confirmed the groundwater flow directions. It is also clear that evolution orders correspond to the possible flow rates in areas with a homogeneous gradient, but with higher hydraulic conductivity conditions to the south and center, compared to the north.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79156780","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}

引用次数: 8

Dense tracking, mapping and scene labeling using a depth camera 密集跟踪，映射和场景标记使用深度相机

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-03-27 DOI: 10.17533/UDEA.REDIN.N86A07

Andrés Díaz-Toro, Lina María Paz-Pérez, Pedro Piniés-Rodríguez, Eduardo Caicedo-Bravo

{"title":"Dense tracking, mapping and scene labeling using a depth camera","authors":"Andrés Díaz-Toro, Lina María Paz-Pérez, Pedro Piniés-Rodríguez, Eduardo Caicedo-Bravo","doi":"10.17533/UDEA.REDIN.N86A07","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A07","url":null,"abstract":"Presentamos un sistema de localizacion con informacion densa, reconstruccion 3D, y deteccion de objetos en ambientes tipo escritorio, usando una camara de profundidad; el sensor Kinect. La camara se mueve manualmente mientras se estima su posicion, y se construye un modelo denso con informacion de color de la escena que se actualiza permanentemente. El usuario puede, alternativamente, acoplar el modulo de deteccion de objetos (YOLO: you only look once [1]) para detectar y propagar al modelo informacion de categorias de objetos comunmente encontrados sobre escritorios, como monitores, teclados, libros, vasos y laptops, obteniendo un modelo con color asociado a la categoria del objeto. La posicion de la camara es estimada usando una tecnica modelo-frame con el algoritmo iterativo de punto mas cercano (ICP, iterative closest point) con resolucion en niveles, logrando una trayectoria libre de deriva, robustez a movimientos rapidos de la camara y a condiciones variables de luz. Simultaneamente, los mapas de profundidad son fusionados en una estructura volumetrica desde las posiciones estimadas de la camara. Para visualizar una representacion explicita de la escena se emplea el algoritmo marching cubes. Los algoritmos de localizacion, fusion, marching cubes y deteccion de objetos fueron implementados usando hardware para procesamiento grafico con el fin de mejorar el desempeno del sistema. Se lograron resultados sobresalientes en la posicion de la camara, alta calidad en la geometria y color del modelo, estabilidad del color usando el modulo de deteccion de objetos (robustez a detecciones erroneas) y manejo exitoso de multiples instancias de la misma categoria","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73798705","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}

引用次数: 3

Device for simulation of restrictive pathologies in healthy subjects with non-invasive mechanical ventilation 在无创机械通气的健康受试者中模拟限制性病理的装置

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-03-27 DOI: 10.17533/UDEA.REDIN.N86A03

Isabel Cristina Muñoz-Ortega, David Alexander Urrego-Higuita, Andrés Felipe Vallejo-Aristizábal, Alher Mauricio Hernández-Valdivieso

{"title":"Device for simulation of restrictive pathologies in healthy subjects with non-invasive mechanical ventilation","authors":"Isabel Cristina Muñoz-Ortega, David Alexander Urrego-Higuita, Andrés Felipe Vallejo-Aristizábal, Alher Mauricio Hernández-Valdivieso","doi":"10.17533/UDEA.REDIN.N86A03","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A03","url":null,"abstract":"La evaluacion de la mecanica ventilatoria en pacientes ventilados mecanicamente permite ajustar su tratamiento en las unidades de cuidados intensivos en terminos del ajuste del modo ventilatorio y sus parametros asociados. Sin embargo, solo con maniobras obstructivas es posible estimar parametros como la compliancia y la resistencia respiratorias en ventilacion espontanea. Una de las limitaciones mas importantes en el desarrollo de tecnicas de estimacion no obstructivas de la mecanica ventilatoria es que se trata de un sistema no estacionario y la variacion de sus parametros esta sujeta a la variabilidad del patron ventilatorio. Este articulo tiene como objetivo presentar y evaluar un dispositivo que permita modificar artificialmente la distensibilidad toracica de un sujeto sano, lo cual permitira registrar en un futuro una base de datos util para el desarrollo de tecnicas de estimacion de la mecanica ventilatoria. El dispositivo se conformo por una coraza, una bomba y un controlador que permite variar la presion al interior de la coraza, la cual fue ubicada en el pecho y abdomen de los voluntarios para cambiar la distensibilidad de manera controlada. 5 voluntarios participaron en la avaluacion del dispositivo, consiguiendo cambios porcentuales de 34,5 ± 9,4% respecto a su valor en reposo para una presion de 10 cmH2O y cambios de 46,8 ± 5,7% para la maxima presion de 20 cmH2O. Se logro disenar un dispositivo que permitiera modificar artificialmente la distensibilidad toracica de manera comparable para cualquier sujeto sano","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86322832","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}

引用次数: 2

Study of non-linear optical properties in automobile lubricating oil via Z-Scan technique 用z扫描技术研究汽车润滑油的非线性光学特性

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-03-27 DOI: 10.17533/UDEA.REDIN.N86A04

Johan Sebastián Díaz-Tovar, S. Valbuena-Duarte, F. Racedo-Niebles

引用次数: 3

A fuzzy logic system to evaluate levels of trust on linked open data resources 链接开放数据资源信任评价的模糊逻辑系统

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-03-27 DOI: 10.17533/UDEA.REDIN.N86A06

J. F. Herrera-Cubides, P. Gaona-García, Jorge Ivan Alonso-Echeverri, Kevin Alexandre Riaño-Vargas, A. Gómez-Acosta

{"title":"A fuzzy logic system to evaluate levels of trust on linked open data resources","authors":"J. F. Herrera-Cubides, P. Gaona-García, Jorge Ivan Alonso-Echeverri, Kevin Alexandre Riaño-Vargas, A. Gómez-Acosta","doi":"10.17533/UDEA.REDIN.N86A06","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A06","url":null,"abstract":"Linked Data is a way of using the network by creating links among data from different information sources in order to improve search processes, semantic interoperability among other functionalities. One of the strategies used to perform linked resources queries is through the consumption of SPARQL Endpoints. However, to determine existent trust levels within and outside the knowledge domains where such resources are, the operation of these Endpoints is one of the critical factors for both to realize the state of these resources and their subsequent consumption. To recognize these states, the present article aims at exposing the description, modeling, implementation and analysis of a type-I fuzzy system based on logical rules. It also addresses decision-making regarding the uncertainty that presents the definition of levels of trust to determine the consumption obtained over a set of LOD Datasets Located in several Endpoints. Finally, it presents results, conclusions and further work from a case study performed through the postulation of parameters obtained at runtime over several Endpoints.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79391658","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}

引用次数: 9