ECORFAN Journal Bolivia最新文献_第2页

Hydrogen synthesis from seawater by means of solar energy 利用太阳能从海水中合成氢

ECORFAN Journal Bolivia Pub Date : 2021-12-31 DOI: 10.35429/ejb.2021.14.8.18.22

J. Montes-Gutierrez, Víctor HERRERA-JIMENEZ, Ricardo RODRIGUEZ-CARVAJAL, Rafael GARCIA-GUTIÉRREZ

{"title":"Hydrogen synthesis from seawater by means of solar energy","authors":"J. Montes-Gutierrez, Víctor HERRERA-JIMENEZ, Ricardo RODRIGUEZ-CARVAJAL, Rafael GARCIA-GUTIÉRREZ","doi":"10.35429/ejb.2021.14.8.18.22","DOIUrl":"https://doi.org/10.35429/ejb.2021.14.8.18.22","url":null,"abstract":"In the electrolysis of seawater as a source of hydrogen, two options exist for the performance of the electrolysis process. The first option is the total desalination of the sea water and then add alkalis for the process of electrolysis to produce hydrogen in the cathode and oxygen in the anode. The disadvantages of this approach are the high cost of desalination and the water treatment to make it alkaline. The main advantage is the ability to use developed technology for the direct electrolysis of fresh water. The second option is to design an electrolyze system capable of utilizing sea water for direct electrolysis at a low power density and electrolyze only a small portion of the water in contact with the electrodes. The advantage of this method is the lower capital required for the system and natural elimination of the waste brine which is only slightly enriched with salts. Also using this technic is possible to produce important amounts of chlorine as a sub-product and also magnesium and sodium as hydroxides that have many uses in the chemical industry. In this research we produced hydrogen via electrolysis from simply natural resources, seawater and solar energy. In order to carry out this experiment we used water from Bahia of Kino Sonora, a place no too far from the University of Sonora, only 100 kilometers away, and a 100-W solar panel that generate DC electricity using directly sunlight that is an abundant resource in the coasts of Sonora. In this work we have been able to produce about 2 liters of hydrogen per hour and nearly 1.2 liters of chlorine per hour with a normal direct radiation of 900 W/m2. This technique could be the solution to the fuels problematic of the ethnicities that inhabit the shores of Sonora and other states of México.","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116247716","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

Characterization of silica sand from grinding and sieving, for use and handling asraw materials by dry means 硅砂的特性从研磨和筛分，使用和处理作为原料的干燥手段

ECORFAN Journal Bolivia Pub Date : 2021-12-31 DOI: 10.35429/ejb.2021.15.8.21.27

Jorge González-Toto

{"title":"Characterization of silica sand from grinding and sieving, for use and handling as\u0000raw materials by dry means","authors":"Jorge González-Toto","doi":"10.35429/ejb.2021.15.8.21.27","DOIUrl":"https://doi.org/10.35429/ejb.2021.15.8.21.27","url":null,"abstract":"Objectives\u0000\u0000The present research work allows to apply the grinding and sieving in the characterization of raw materials by dry way in Chemical Engineering in the same way it allows studying the behavior of the diameters and the distribution of the particles from the sand screening silica, whose purpose is to determine the efficiency in the grinding of solids, in the sieving of particles of different sizes from Tyler sieves, whose purpose is to characterize the silica sand as solid raw materials by dry way, related to the different applications of the unit operations such as: in the glass, ceramic, metallurgy, foundry, construction, abrasive and drying industries.\u0000\u0000\u0000Methodology\u0000\u0000 This article describes the methodology of the grinding and sieving of silica sand in the laboratory of Chemical plants of the Technological University of the southeast of Veracruz, from which the operation is developed and obtaining its efficiency, as a product in the mesh 70, from the screening and characterization of this solid raw material by dry method. for later uses in industry and in Chemical Engineering.\u0000\u0000Contribución\u0000\u0000Las industrias hoy en día requieren del analisis de sus materias primas de acuerdo a las especificaciones de los clientes, es por ello que la molienda y el tamizado ha permitido a la ingeniería Química un amplio desarrollo en las operaciones unitarias, así como la mejora de la calidad en los productos solidos ya sea por vía seca o húmeda, en este proyecto se desarrolla un tratamiento por vía seca de la arena silica. a partir de la molienda en un molino de bolas y tamizado en un tamizador Axial desarrollado en el Laboratorio de plantas de la Universidad Tecnológica del Sureste de Veracruz, se pretende comercializarlo con empresas del ramo, como: MADISA, cuyo propósito sea aplicarlo en la producción, elaboración y manufactura de envases de color ámbar ya se medicinal o envases de cerveza (Retsch, 2012).","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116144553","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

Prototype of a mobile application for the registration and diagnosis of patientsinfected with tuberculosis in the Huasteca Hidalguense region 用于登记和诊断Huasteca Hidalguense地区结核病感染患者的移动应用程序原型

ECORFAN Journal Bolivia Pub Date : 2021-12-31 DOI: 10.35429/ejb.2021.15.8.14.20

Luis Alberto MENDOZA-SAN JUAN, Hermes SALAZAR-CASANOVA, Yucels Anaí DEL CARMENMORALES, Juan Carlos MARTÍNEZ-MAGOS

{"title":"Prototype of a mobile application for the registration and diagnosis of patients\u0000infected with tuberculosis in the Huasteca Hidalguense region","authors":"Luis Alberto MENDOZA-SAN JUAN, Hermes SALAZAR-CASANOVA, Yucels Anaí DEL CARMENMORALES, Juan Carlos MARTÍNEZ-MAGOS","doi":"10.35429/ejb.2021.15.8.14.20","DOIUrl":"https://doi.org/10.35429/ejb.2021.15.8.14.20","url":null,"abstract":"This project aims to document the migration of the web prototype for the registration of patients potentially infected with tuberculosis in the Huasteca Hidalguense to a mobile application that facilitates usability through different devices for the Sanitary Jurisdiction No.10 of Huejutla de Reyes, Hidalgo. The methodology used is Xp Extreme Programming, which allows rapid development, with a panorama and more used approach to agile software development; it has as phases planning, design, coding and testing. As a result, a mobile prototype was developed, using React Native technology, which is adapted for this project that is intended to be scalable and cover a wide range of devices, regardless of the technology, or the manufacturer because the framework used has the ability to perform cross-platform applications, optimizing development time. This research has as its main advantage the transparency of the application for users, because they will be able to use any mobile device regardless of the operating system for its operation, eliminating restrictions and limitations to the personnel of the Health Jurisdiction for the registration of samples of patients potentially infected with Tuberculosis in the region of the Huasteca Hidalguense, streamlining the diagnostic process.","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126597570","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

Thermal crystallization of polyethylene terephthalate (PET) for recycling and caring for the environment 热结晶的聚对苯二甲酸乙二醇酯(PET)回收和爱护环境

ECORFAN Journal Bolivia Pub Date : 2021-12-31 DOI: 10.35429/ejb.2021.14.8.13.17

Araceli Salazar-Peralta, José Alfredo Pichardo-Salazar, Ulises Pichardo-Salazar, R. Chávez

{"title":"Thermal crystallization of polyethylene terephthalate (PET) for recycling and caring for the environment","authors":"Araceli Salazar-Peralta, José Alfredo Pichardo-Salazar, Ulises Pichardo-Salazar, R. Chávez","doi":"10.35429/ejb.2021.14.8.13.17","DOIUrl":"https://doi.org/10.35429/ejb.2021.14.8.13.17","url":null,"abstract":"Mexico is one of the main consumers of PET worldwide. In Mexico, urban solid waste has not received adequate attention due to a series of factors of various kinds, among which are: Collection of mixed garbage (in 95% of the national territory) [I, II], public services insufficient and inefficient cleanliness, poor coordination between the different levels of government, incomplete legal framework and legislative work with a particular vision, passivity in ecological matters and little culture of recycling in society [III, IV, V]. Sustainable development, as it is currently disseminated, begins in 1983, when the United Nations (UN) created the Commission on Environment and Development, chaired by Gro Harlem Brundtland, who was Prime Minister of Norway. The Brundtland Commission, carried out studies, analyses, and public consultations [VI], all over the world, for approximately three years, ending in April 1987, with the publication and dissemination of the report called Our Better Common Future known as The Brundtland Report [VII, VIII, IX]. The objective of this study was to determine the temperature at which polyethylene terephthalate (PET) in the form of granules, changes from amorphous to crystalline, since recrystallization improves the properties, which is necessary for the reuse of the material.","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124312940","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

Agronomic behaviour and population densities of inbred lines to form maize hybrids for Mexican tropic 墨西哥热带玉米杂交自交系的农艺行为和种群密度

ECORFAN Journal Bolivia Pub Date : 2021-12-30 DOI: 10.35429/ejb.2021.14.8.1.6

M. Sierra-Macías, Flavio Antonio Rodríguez-Montalvo, P. Andrés-Meza, A. Espinosa-Calderón

{"title":"Agronomic behaviour and population densities of inbred lines to form maize hybrids for Mexican tropic","authors":"M. Sierra-Macías, Flavio Antonio Rodríguez-Montalvo, P. Andrés-Meza, A. Espinosa-Calderón","doi":"10.35429/ejb.2021.14.8.1.6","DOIUrl":"https://doi.org/10.35429/ejb.2021.14.8.1.6","url":null,"abstract":"Improved seeds are the most important input in corn production, they represent the genetic yield potential and quality production. The objectives of this research were to know the behavior and seed productivity in maize inbred lines, which participate as parents in three-way hybrids. During spring summer season in 2017, there was carried out in Cotaxtla experimental station, INIFAP, in Veracruz, México, a factorial experiment arranged on split plots design distributed in complete blocks at random, with three replications in plots of one row 5 m long and 80 cm wide. There where evaluated 15 elite inbred lines as Small Plot (SP), with densities of 50,000 and 62,500 pl ha-1, as Big Plot (BP). There were registered treatments: Grain yield, days to tassel and silking, plant and ear height, plant and ear aspect and sanity, plant and ear number, lodging, bad husk cover and ear rot. For grain yield, there were found high signifficant differences for density (D) and lines (L) but there was no found statistical signifficance for interaction DxL. The best yield for lines were: LT160, LT173 and LT166, with 5219, 4225 and 4213 kg ha-1, for each one, respectively; Density of 62,500 pl ha-1, registered grain yield of 3154 kg ha-1, 29% more than 50,000 pl ha-1.","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127129738","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

Technical Report for the Instituto Tecnológico Superior de la Región Sierra in productivity matters 为Tecnológico Superior de la Región Sierra研究所提供的关于生产力问题的技术报告

ECORFAN Journal Bolivia Pub Date : 2021-07-31 DOI: 10.35429/ejb.2021.15.8.1.6

Ricardo De La Cruz-García, José Luis Meneses-Hernández, Jucelly Castro-De La Cruz, Betsaida OLÁN-CASTRO

引用次数: 0

Spectroscopic analysis of organic materials susceptible to transformation processes 易受转化过程影响的有机材料的光谱分析

ECORFAN Journal Bolivia Pub Date : 2020-12-31 DOI: 10.35429/EJB.2020.13.7.1.6

Beatríz Eugenia Moreno-Martínez, Virginia Ramírez-Salas /, R. E. Zavala-Arce, Cielo Vanessa Gonzalez-Sanchez

{"title":"Spectroscopic analysis of organic materials susceptible to transformation processes","authors":"Beatríz Eugenia Moreno-Martínez, Virginia Ramírez-Salas /, R. E. Zavala-Arce, Cielo Vanessa Gonzalez-Sanchez","doi":"10.35429/EJB.2020.13.7.1.6","DOIUrl":"https://doi.org/10.35429/EJB.2020.13.7.1.6","url":null,"abstract":"Carry out a spectroscopic study of various materials of organic origin, specifically residues from various processes, both biological and agro-industrial, in order to study their structural characteristics in their main functional groups, since their nature can determine the viability of a process of recycling to obtain new products. Some of the organic materials studied were of great importance because these materials can be susceptible to transformation through various processes such as thermochemical, biological, and biochemical transformation. Leaf samples from the Moringa plant (Moringa Oleifera), orange peels (Citrus sinensis), as well as leachate from the vermicomposting process of the Californian red worm (Eisenia foetida) were analyzed. The results obtained indicate a different composition, but in turn, show similarity in some specific bands, such as carboxylic acids, OH groups, methyl groups, as well as some aromatic groups in the case of citrus fruits. The importance of this research lies in the fact in the study of the transformation processes of these wastes, for future applications.","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130043887","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

Salivary Flow and ph in pregnant patients 妊娠患者唾液流量和ph值

ECORFAN Journal Bolivia Pub Date : 2020-12-31 DOI: 10.35429/EJB.2020.13.7.7.10

Guadalupe Rosalía Capetillo-Hernánde, Rosa Elena Ochoa-Martínez, E. Torres-Capetillo, Leticia Tiburcio-Morteo

{"title":"Salivary Flow and ph in pregnant patients","authors":"Guadalupe Rosalía Capetillo-Hernánde, Rosa Elena Ochoa-Martínez, E. Torres-Capetillo, Leticia Tiburcio-Morteo","doi":"10.35429/EJB.2020.13.7.7.10","DOIUrl":"https://doi.org/10.35429/EJB.2020.13.7.7.10","url":null,"abstract":"Saliva is multifunctional: cleaning of the oral cavity, lubrication, preservation, repair of mucous membranes and dental hard tissues; the pH and its buffering, also participates in the elimination of bacteria, digestion and speech. The salivary composition in gestational period is altered, with variation of salivary pH and buffer capacity. Objective. To determine the levels of pH and salivary flow that prevail in pregnant patients. Methodology. Descriptive, prospective and transversal study. Sampling for convenience: pregnant patients in the 1st, 2nd and 3rd trimesters who attended the UMF. 61 to medical control of their pregnancy. Using a calibrated JENWAY 3510 Ph Meter potentiometer. Saliva samples were collected at least one hour after eating. Contribution. The salivary pH in pregnant women is lower in the first quarter than in later ones. According to Spearman's test analysis, a positive correlation is reported (r2 = 0.34), the correlation of ranges between pH and salivary volume is statistically significant even if it is weak. The salivary pH is lower in the first quarter than in the two subsequent ones, the salivary flow does not vary significantly in the first and second quarters, but it increases in the third quarter.","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"138 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130893086","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

Ultrafine particle dispersion in the metropolitan area of Guadalajara, Mexico 墨西哥瓜达拉哈拉市区的超细颗粒分散

ECORFAN Journal Bolivia Pub Date : 2020-12-31 DOI: 10.35429/EJB.2020.13.7.11.17

L. Peña-García, Celia Robles-Murguía, Roberto Maciel-Flores, J. Rosas-Elguera

{"title":"Ultrafine particle dispersion in the metropolitan area of Guadalajara, Mexico","authors":"L. Peña-García, Celia Robles-Murguía, Roberto Maciel-Flores, J. Rosas-Elguera","doi":"10.35429/EJB.2020.13.7.11.17","DOIUrl":"https://doi.org/10.35429/EJB.2020.13.7.11.17","url":null,"abstract":"Objectives: Dust, soil and leaf samples of Ficus benjamina were collected in the metropolitan area of Guadalajara (GMA) (Peña-García et al., 2017), allowing to identify the type of metallic particles, size, shape and spatial distribution. With the results obtained, the possible effects of metallic particles on human and plant health were discussed (Peña-García et al., 2019). Methodology: The sampling was in six municipalities of the GMA; Atomic absorption spectrophotometry analyses were carried out on leaves, which identified the presence of various elements that mostly exceeded the reference values. Through X-ray fluorescence, 23 elements were identified in soil, including Th and Ac in at least 14 sites. Using the scanning electron microscopy technique and elemental mapping analysis, coarse, fine and ultrafine metallic particles were identified in human bronchus and lung tissue, as well as fragments of cement, plastic, yeast and bacteria. The similarity between the metallic particles in the collected samples and those observed in lung tissue, warns of latent risks to the health of the GMA population. Contribution: The results obtained with the methodology used in this work allow us to glimpse the polluting potential in urban areas.","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121500107","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

Spectroscopic and thermogravimetric studies of homogeneous materials from PU/PMMA/SiO2 PU/PMMA/SiO2均质材料的光谱和热重研究

ECORFAN Journal Bolivia Pub Date : 2020-12-31 DOI: 10.35429/EJB.2020.13.7.18.23

Virginia Ramírez-Salas, Luis Daniel Ordoñez-Pacheco, Erika Alarcón-Ruiz, Beatríz Eugenia Moreno-Martínez

{"title":"Spectroscopic and thermogravimetric studies of homogeneous materials from PU/PMMA/SiO2","authors":"Virginia Ramírez-Salas, Luis Daniel Ordoñez-Pacheco, Erika Alarcón-Ruiz, Beatríz Eugenia Moreno-Martínez","doi":"10.35429/EJB.2020.13.7.18.23","DOIUrl":"https://doi.org/10.35429/EJB.2020.13.7.18.23","url":null,"abstract":"Polymers of organic-inorganic origin are incompatible by nature and a proposal to solve this behavior is the formation of Interpenetrated Polymeric Networks (IPN) using coupling agents. Coupling agents make it possible to create a crosslinking between the phases present that provides better mechanical, optical and thermal properties. These materials are known as Hybrid Networks. To obtain optically transparent materials, individual networks of Polyurethane (PU), Methyl Polyacrylate (PMMA) and Silica (SiO2) were used. Binary and ternary networks were synthesized using bulk polymerization incorporating SiO2 up to 10% by weight. In this research, coupling agents such as Trimethoxysilyl Propyl Methacrylate (MSMA) and Isocyanotopropyl Triethoxy Silane (IPTS) were introduced to the ternary networks in order to reduce the phase separation that occurs in these systems. Fourier Transform Infrared Spectroscopy (FTIR) studies demonstrated the presence of functional groups of binary and ternary networks. On the other hand, the thermogravimetric tests (TGA) carried out on hybrid IPN´s with coupling agents, presented greater thermal stability and better optical properties, providing the new IPN´s with the opportunity to have promising applications.","PeriodicalId":300616,"journal":{"name":"ECORFAN Journal Bolivia","volume":"225 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123361899","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