Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia最新文献_第10页

Sorption characteristics of peeled beans and shells of fermented and dry Trinitario cocoa beans (Theobroma cacao L.) 发酵和干燥的Trinitario可可豆(Theobroma cacao L.)去皮豆和壳的吸附特性

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2020-01-01 DOI: 10.22209/rt.v43n1a07

A. J. Sandoval, J. A. Barreiro, A. D. Sousa, D. Blanco, C. Giménez

{"title":"Sorption characteristics of peeled beans and shells of fermented and dry Trinitario cocoa beans (Theobroma cacao L.)","authors":"A. J. Sandoval, J. A. Barreiro, A. D. Sousa, D. Blanco, C. Giménez","doi":"10.22209/rt.v43n1a07","DOIUrl":"https://doi.org/10.22209/rt.v43n1a07","url":null,"abstract":"Water sorption data of the peeled bean and shell of Trinitario fermented and dry cocoa beans were determined at 25 °C and adjusted to the isotherm models of Brunauer-Emmet-Teller-(BET) and Guggenheim-Anderson-de Boer-(GAB). The difference in the moisture sorption capacity of the shell and peeled beans was clearly established. The monolayer water contents estimated using the BET and GAB models for the peeled bean was 3.53 and 3.60 g water/100 g dry solids, respectively; while for the shell were 8.42 and 8.50 g water/100 g dry solids. The energy constants (C) obtained applying the BET model for the peeled bean and shell were 154.3 and 163.2, respectively. Those estimated from the GAB model (C ́) were 21.63 and 83.56, respectively. A larger C ́ value for the shell indicates stronger water binding to the active sites in the monolayer as compared with the peeled beans that could indicate the presence of more active polar sites in the former. The value of the K constant in the GAB model was 0.871 and 0.942 for the peeled bean and shell respectively that could suggest a larger water adsorption by proteinaceous material in the peeled bean.","PeriodicalId":21456,"journal":{"name":"Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia","volume":"50 1","pages":"49-55"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84311890","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

Modelo CFD para caracterizar el transporte del retardante de llama BDE 99 en una laguna facultativa usada para el tratamiento de aguas residuales municipales 用于城市废水处理的兼性泻湖中阻燃BDE 99的输送CFD模型

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2020-01-01 DOI: 10.22209/rt.v43n1a06

Andrés Mauricio Zapata Rivera, M. P. Varón

引用次数: 3

Fitoacumulación y translocación de cromo en Eichhornia crassipes y Pistia stratiotes durante el tratamiento de efluentes contaminados 污染废水处理过程中铬在凤眼莲和凤眼莲中的植物积累和转运

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2020-01-01 DOI: 10.22209/rt.v43n1a04

Charity Elizabeth Andrade Ruiz, A. Cáceres, Alexandra Lisbet Vera Bonilla, G. Araujo, E. M. Avendaño

{"title":"Fitoacumulación y translocación de cromo en Eichhornia crassipes y Pistia stratiotes durante el tratamiento de efluentes contaminados","authors":"Charity Elizabeth Andrade Ruiz, A. Cáceres, Alexandra Lisbet Vera Bonilla, G. Araujo, E. M. Avendaño","doi":"10.22209/rt.v43n1a04","DOIUrl":"https://doi.org/10.22209/rt.v43n1a04","url":null,"abstract":"Plants can remove metals from aqueous systems, based on strategies such as metal exclusion; or by its accumulation in leaves and pseudostem in non-toxic form. The capacity of phytosorption and translocation of Pistia stratiotes and Eichhornia crassipes was evaluated, exposing them to Cr(VI): 5, 10, 25 and 50 mgL -1 . The experimental units consisted of glass bottles containing 0.5L of synthetic effluent, fertilizer and one plant per container. These were maintained with luminous intensity 106±23 μmol quanta m s -1 , light: darkness periods: 12:12h, and 28±2ºC. The determination of Cr(VI) was carried out in the medium, at the beginning and every 24h, for 10 days. The Cr(total) in plant was determined at the end of the treatment. The biggest removal was obtained using Eichhornia with 98.0 and 97.1% in the treatments at 5 and 10 mgCr (VI) L -1 , respectively. While for the same, Pistia removed 80.2 and 74.0%. The highest bioaccumulation was observed at the root level, with a bioaccumulation factor (FB) between 360-370 for Pistia and 490-708 for Eichhornia . Both plants achieved low values for translocation factor (FT<0.1). The plants showed an efficient bioaccumulation of the metal, following an exclusion mechanism that allows their photosynthetic apparatus not to be affected during the treatment.","PeriodicalId":21456,"journal":{"name":"Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77552861","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

Efecto de la incorporación por vía seca de residuos de caucho obtenido tras su remoción de una pista de aterrizaje de aeropuerto en un asfalto AC-20 在AC-20沥青中，从机场跑道上移除后获得的橡胶废料的干掺入效应

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2020-01-01 DOI: 10.22209/rt.v43n1a01

W. Cando, Lenys Fernández, Patricio Bonilla, Gustavo Yánez, J. Bucheli, A. Muñoz, María Fernanda Orquera, Patricio Espinoza-Montero

引用次数: 10

Estadística aplicada: Validación de la escala de Fischer, King y Tague en estudiantes de ingeniería 应用统计学:工程学生Fischer, King和Tague量表的验证

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2019-12-01 DOI: 10.22209/rt.ve2019a02

P. M. Ferres, Antonio Medina Rivilla, Nathaly Vera-Gajardo

引用次数: 1

Evaluación del riesgo vehicular por desprendimientos de rocas en taludes, Carretera Rafael Caldera, Mérida, Venezuela 委内瑞拉梅里达拉斐尔卡尔德拉路斜坡岩崩的车辆风险评估

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2019-12-01 DOI: 10.22209/rt.ve2019a08

Roberto Torres Hoyer, Jesús Torres Hoyer, F. Bongiorno, J. Peña, Oswaldo Peña, L. González, R. Picón, Wilmer Barreto

引用次数: 0

Comparison of performance measures in non-Markovian queues 非马尔可夫队列中性能度量的比较

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2019-12-01 DOI: 10.22209/rt.ve2019a16

D. Lagos, R. Mancilla, P. Leal

{"title":"Comparison of performance measures in non-Markovian queues","authors":"D. Lagos, R. Mancilla, P. Leal","doi":"10.22209/rt.ve2019a16","DOIUrl":"https://doi.org/10.22209/rt.ve2019a16","url":null,"abstract":"Systems that involve waiting before attention are framed within the Theory of queues. This work seeks to compare performance measures in non-Markovian queues. For this, single-tail systems were simulated, which were formed from the combinations of time distributions between arrivals (normal, lognormal, Weibull or triangular), their parameters (Test 1, Test 2 or Test 3), and the distributions of service times (constant or triangular). Some results show that when comparing each performance measure individually, for systems that maintain constant arrival parameters, service distributions, and vary the distribution of time between arrival, their joint behavior is statistically different. On the other hand, the systems that included normal or uniform input distributions, setting the distribution parameters with one or two standard deviations (1σ; 2 σ), and the service distribution, showed that in the evaluation of each measure of particular performance, had statistically equal values. In the case of the systems that included the parameters with the highest standard deviation and the lognormal and Weibull, or lognormal and uniform distributions, they presented statistically similar behavior in three of four performance measures.","PeriodicalId":21456,"journal":{"name":"Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88820876","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

Evidencias Tectono-Estructurales y Morfológicas del Corrimiento de Mesa Bolívar en la Zona de Chiguará del Estado Mérida 梅里达州chiguara地区Mesa bolivar滑坡的构造-构造和形态证据

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2019-12-01 DOI: 10.22209/rt.ve2019a10

L. González, W. Peñaloza, M. E. Perdomo, F. Bongiorno, Roberto Torres

引用次数: 1

Catalizadores bifuncionales a base de imogolita, Ni y Mo para el mejoramiento de las propiedades fisicoquímicas del bio-aceite proveniente de cáscara de avena 以伊莫golite、Ni和Mo为基础的双功能催化剂，用于改善燕麦壳生物油的物理化学性能

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2019-12-01 DOI: 10.22209/rt.ve2019a04

Armando E. González, M. Placencia, N. Arancibia-Miranda, Cedenna Santiago Chile. Nanotechnology

引用次数: 0

Síntesis asistida por microondas de epoxidados obtenidos a partir de lípidos de lodos de aguas residuales domiciliarias para el desarrollo de resinas epóxicas 微波辅助从生活污水污泥脂类中合成环氧化合物，用于开发环氧树脂

Revista Tecnica De La Facultad De Ingenieria Universidad Del Zulia Pub Date : 2019-12-01 DOI: 10.22209/rt.ve2019a11

A. Echeverria, L. Romero, P. Hidalgo, A. Sánchez, R. Hunter

引用次数: 0