bluuebunny/crossref_metadata_2025 huggingface dataset:
Reflexiones historiográficas sobre la biografía
Authors: Velásquez Rivera Edgar de Jesús
Published: February 2021

Como se sabe, desde la antigüedad clásica la biografía ha tenido una compleja evolución y sueledefinirse como la historia o el testimonio de la vida de una persona. La biografía es, ante todo, unaconstrucción histórica, dando lugar ello a una rica polifonía en cada cultura. Aunque se le señala deser una creación subjetiva donde la fantasía y la libertad comprensiva juegan un rol determinante,estimamos su enorme valía como recurso cognitivo en el conjunto de las Ciencias Humanas y Sociales,a lo cual pretende contribuir este artículo desde unas reflexiones historiográficas sobre tanimportante género.
Effect of delignification on the physical, thermal, chemical, and structural properties of sugar palm fibre
Authors: Ilyas R. A. , Sapuan S. M. , Ishak M. R. , Zainudin E. S.
Published: February 2021

Eco-friendly composites can be prepared by substituting man-made synthetic fibres with various types of cellulosic fibres. Sugar palm-derived nanocrystalline cellulose is a potential substitute. The most important factor in determining a good nanofiller reinforcement agent that can be used in composites is the character of the nanofiller itself, which is affected during a preliminary treatment. Thus, to gain better nanofiller properties, the delignification (NaClO2 and CH3COOH) and mercerization (NaOH) treatments must be optimized. The main objective of this study was to identify the effects of the delignification and mercerization treatments on sugar palm fibre (SPF). In addition, the characteristics of the SPF for the preparation of the hydrolysis treatment to produce nanocrystalline cellulose (NCC) for reinforcement in polymer composites were examined. Sugar palm cellulose (SPC) was extracted from the SPF, and its structural composition, thermal stability, functional groups, and degree of crystallinity were determined via field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD), respectively. The density, moisture content, chemical composition, and structure of the SPC were also analysed.
Physicochemical changes of cellulose and their influences on Populus trichocarpa digestibility after different pretreatments
Authors: Yao Lan , Yoo Chang Geun , Pu Yunqiao , Meng Xianzhi , Muchero Wellington , Tuskan Gerald A. , Tschaplinski Timothy J. , Ragauskas Arthur J. , Yang Haitao
Published: February 2021

Pretreatment is commonly used to reduce recalcitrance of the lignin-carbohydrate matrix. In this study, leading pretreatment technologies, including dilute sulfuric acid, liquid hot water, alkaline, and organosolv pretreatments, were applied to the selected Populus trichocarpa genotype with relatively low lignin content to elucidate cellulose physicochemical property changes and digestibility-related factors. Pretreated Populus trichocarpa (BESC 131) exhibited higher accessibility and glucose yield than the untreated biomass. Chemical composition and Fourier transform infrared (FTIR) analysis results revealed that hemicellulose and lignin were removed to a varying extent depending on the pretreatment techniques applied. The degree of polymerization of the cellulose was decreased to the largest extent after dilute acid pretreatment, followed by organosolv, alkaline, and liquid hot water pretreatments. Cellulose crystallinity index was slightly changed after the pretreatments; however, its differences were not remarkable between those pretreatment techniques. Among four different pretreatments, organosolv was the most effective pretreatment technology in terms of sugar release, which was three times higher than that of the untreated native biomass. Among all of the tested cell wall traits, the lignin content of Populus trichocarpa was the most remarkable feature associated with glucose release, though Populus trichocarpa recalcitrance was not solely dependent on any single factor.
Acoustic properties in Arizona cypress logs: A tool to select wood for sounding board
Authors: Roonia Mehran , Hossein Mohammad-Ali , Alavi-Tabar Seyed-Ehsan , Tajdini Ajang , Jahan-Latibari Ahmad , Manouchehri Negin
Published: February 2021

In this study, variation in acoustic properties of Arizona cypress wood was monitored from pith to bark as affected by tapering of the growth ring width. Specific modulus of elasticity, acoustic coefficient, damping, and acoustic conversion efficiency were calculated. It was shown that the outer parts of the stem, close to the bark containing narrower growth rings, exhibited lower damping due to internal friction and higher sound radiation. Our finding theoretically justified the luthier craftsmen’s traditional preference toward timbers with narrow growth rings to make sounding boards in musical instruments.
Remigration in Lithuania in the 21st Century: Readiness of the Education System to Accept Students from Returning Families
Authors: Bagdonaitė Jurgita
Published: February 2021

The article analyses the readiness of the Lithuanian education system to accept children from returning families. Moreover, it determines the problems and describes the factors hindering the effective integration of remigrant children. The summarised scientific literature is illustrated by empirical research data. Based on the aforementioned data of this study, it is concluded that the concept of education of remigrant children is ever-changing. The main obstacles that Lithuanian educational institutions are facing at the moment are Lithuanian language education and nurturing, a lack of tolerance and competencies of educators. The development and creation of a cooperative environment within the school is determined to be one of the most successful methods to facilitate the job of educators.
Positive Psychology: Overview of the Links between Trait Emotional Intelligence and Positive Psychology
Authors: Garbenis Simas
Published: February 2021

The main purpose of this article is to reveal the interaction between trait emotional intelligence and positive psychology ideas. The article reviews the main idea of positive psychology, examines the 3 main levels of this discipline, and their essential principles. The article also provides brief insights into different theories of emotional intelligence, focusing on the features of trait emotional intelligence, its structure and functions. Theoretical insights revealing the interactions between the ideas of positive psychology and emotional intelligence are presented not only in terms of functions of trait emotional intelligence, but also in terms of its trait structure manifestation at different levels of positive psychology. It has been established that the interaction of trait emotional intelligence and positive psychology exists due to functions of emotional intelligence, its perspectives in predicting life success and the structure of traits manifested at the subjective, individual and group levels of positive psychology.
3D bioprinting–a step towards heart tissue regeneration
Authors: Shahzadi Sana , Ishtiaq Isha , Aslam Khadija , Ali Usama , Mehak Savera , Khan Sara , Sajjad Shanza , Babar Maria
Published: February 2021

Heart disease and cardiovascular disease is a very serious and growing public health issue. Tissue-engineering has great potential and great strength for regeneration, remolding, and growth. In the case of heart failure, Allografting has been used. 3D bioprinting has a great impact in the field of cardiovascular tissue engineering. It has been observed that 3D Bioprinting is used to construct an artificial heart for transplantation and used to create myocardial cells in case of injury. Recent studies showed that biomaterial used in the treatment of myocardial dysfunction is decellularized cardiac extracellular matrix hydrogel in adults. Collagen, Alginate gelatin, hyaluronic acid, and deECM scaffolds were used as biomaterials in 3D bioprinting. It has been shown that scaffold used with ECM was used to support there generation process A new 3D bioprinting technology was developed in which cells were collected into spheroids and printed on a needle array according to desirable characteristics. Different bio inks such as laser, extrusion, droplet, and stereolithography are used here. Electric stimulation is key to the contractility of cardiomyocytes. A physical cardiac replica was created by image processing software that creates 3D structures. In holographic display 3D, full hearts of patients were printed in flexible material. A process is demonstrated to fabricate robust valves of the heart using the3D bioprinting technique. MRI or CT scans were used to obtained 3D images of the aorta.3D bioprinting plays a huge role in knowing the aortic anatomy involves the aortic valve area and morphology of the root. Recent advances demonstrated that 3D bioprinting can assist in ventricular device placement and perform a specific function in a complex with (CHD) Congenital heart defects. 3D bioprinting holds great prom
РОДИННИЙ НЕКРОПОЛЬ БОРОХОВИЧІВ У МІСТЕЧКУ ЛЮТЕНЬКА ГАДЯЦЬКОГО ПОЛКУ
Authors: Коваленко Оксана
Published: February 2021

У статті аналізуються матеріали археологічних досліджень цвинтаря XVII-XVIII ст. та залишків Свято-Успенської церкви в  с. Лютенька (Полтавщина).

Лютенька була заснована як слобода у 30-х рр. XVII ст.. До 1646 р. була у власності Конєцпольських. У 1648-1782 рр. Лютенька функціонувла, як сотенне містечко у складі Гадяцького, Полтавського, Зіньківського полків. Найтісніше її історія пов’язана із родиною Бороховичів, зокрема із Михайлом Андрійовичем, який у 1672-1687 рр., із незначними перервами, був гадяцьким полковим обозним, а 1687 – 1704 р. – полковником. У статті розглянута родина Михайла та його другої дружини Олени Іванівни. Взаємовідносини останньої та дітей Максима, Федора, Івана, Феодосії і Марії, після смерті батька.

Більшість членів родини знайшли свій спочинок на цвинтарі спеціально збудованої у 1687 р., як родинна усипальниця, Успенської церкви. Звели її в центрі лютенської фортеці на місці старої дерев’яної церкви першої чверті XVII ст. Новозведена церква була мурованою, дев'ятидільною, хрещатою, п'ятибанною. Проіснувала вона до 1985 р. Навколо неї у 2009-2010 рр. досліджена ділянка ґрунтового цвинтаря XVII-XVIII ст., всього близько 300 поховань. Вони розміщені у широтному напрямку, із тяжінням до стін храму, часто на місці раніше існуючих могил.

Впродовж кінця XVII – першої чверті XVIII ст. Бороховичи здійснювали поховання членів своєї родини в підземному просторі центральної частини та обабіч церкви у склепових похованнях. Археологічно вивчено 13 склепів, унікального стану збереженості, які є у фокусі цієї розвідки. Знайдені та атрибутовані поховання самого Михайла Бороховича, його дружини Олени та, вірогідно синів. Поданий детальний опис конструкцій склепів, поховального вбрання, розміщення, супровідних обрядових речей: ікон, хрестів тощо. Матеріали кінця XVII-XVIII ст., розширюють наші уявлення та знання про різні аспекти здійснення поховань, поховальну обрядовість козацької старшини та, назагал, сприяють уточненню уявлень про смерть в часи Гетьманщини.
ГРАВЮРА «ПОХОВАННЯ ГРАФА ФЕДОРА ГОЛОВІНА» З ФОНДОВОЇ ЗБІРКИ НАЦІОНАЛЬНОГО КИЄВО-ПЕЧЕРСЬКОГО ІСТОРИКО-КУЛЬТУРНОГО ЗАПОВІДНИКА
Authors: Філіпова Ганна
Published: February 2021

Дослідження присвячено введенню до історичного контексту гравюри із фондової колекції Національного Києво-Печерського історико-культурного заповідника. Розглядуваний витвір гравірувального мистецтва зображує процесію на похоронах графа Федора Головіна (1650–1706). Відбиток, про який іде мова, датовано ХІХ ст., однак зроблено його з дошки XVIII ст. Дошку виконав невідомий гравер, найпевніше – іноземного походження. Візуальний ряд гравюри містить низку символів, характерних для жалобної культури епохи бароко. Авторка дослідила окремі мотиви, відображені у гравюрі (геральдичні символи, стилізовані античні образи, тема лицарства тощо). Проведено компаративний аналіз зображення поховальної процесії Федора Головіна і відтворених у джерелах похорон інших російських державних діячів того часу, зокрема імператора Петра І. Зауважено, що риси, продемонстровані у творі, тяжіють до польсько-шляхетської традиції pompa funebris. Цю традицію, своєю чергою, росіяни могли запозичити росіянами у козацької старшини Гетьманщини. Також у дослідженні окреслено перспективи вивчення таких творів як джерел барокової поховальної і жалобної ритуалістики.
«СУМУЄМО ТЯЖКОЮ ВТРАТОЮ НАУКИ...»: ВШАНУВАННЯ СМЕРТІ У АРХЕОЛОГІЧНОМУ СПІВТОВАРИСТВІ УСРР ДРУГОЇ ПОЛОВИНИ 1920 х – ПОЧАТКУ 1930 х рр.
Authors: Яненко Анна
Published: February 2021

У статті розглянуто дії та заходи, спрямовані на вшанування колег-археологів і науковців-музейників, які пішли у засвіти у другій половині 1920‑х – на початку 1930‑х рр. На прикладі Данила Щербаківського, котрий учинив самогубство через неможливість продовжувати наукові студії в музеї, померлих Миколи Біляшівського, Василя Ляскоронського, Сергія Дложевського, Бориса Фармаковського, Сергія Гамченка та інших проілюстровано типові пропам’ятні практики тогочасного інтелектуального співтовариства: публічні поховання і панахиди, покладання квітів на могилу, виголошення прощальних промов, ушанування вставанням і хвилиною мовчання під час буденних зібрань наукових осередків, некрологи й меморіальні статті на шпальтах періодики, надсилання телеграм, поштівок, офіційних і приватних листів із висловленням щирого співчуття і жалю через втрату, створення і діяльність спеціальних комісій і комітетів, встановлення анотованих дощок і надання структурним підрозділам наукових установ імені покійного інтелектуала, влаштування виставок, клопотання про надання пенсій родинам покійних, присвяти у фахових виданнях та посмертні публікації наукових студій. Залучено до наукового обігу маловідомі документи, що засвідчували вияв посмертної шани, – некрологи, офіційні та приватні звернення, світлини. Наголошено, що практики вшанування почасти виконували функцію громадянського протесту проти несправедливості, свавілля, нехтування принципами професійності й людяності, функцію опору репресивній і антигуманній політиці тоталітарного режиму.
Sistem Ekonomi Sosialisme Pasar
Authors: Putra Gilang Rizki Aji
Published: February 2021

Abstract:Economy plays a very important role in human life. During its development, various methods or systems can be used to solve it. So far, there are three systems of economic development, namely capitalism / liberalism, socialism and Islam. Those are the questions that will be discussed in this scientific paper. By examining how government participation in development, the method used is descriptive analysis of the three systems. As a conclusion based on this description, it can be said that capitalism is a social system based on the recognition of individual rights. This includes property rights, where all ownership is private property. In other words, capitalism is an economic system that can fully control capital, or investors can use all types of capital. This includes commodities that are used to produce other commodities. The government or the contracting country must not interfere in economic development. The government only has the authority to formulate regulations regarding tax obligations for economic developers. Tax revenue will be used for the national interest, especially to fulfill its obligations for the welfare of the people.Keywords: Socialism, Karl Marx and Economics
Upaya Penanganan Pandemi Covid-19; Telaah atas Peraturan Bupati Majalengka Nomor 54 Tahun 2020 terhadap pelaksanaan kebijakan pendidikan
Authors: Sumantri Andri
Published: February 2021

Pelaksanaan Peraturan Bupati Majalengka Nomor 54 Tahun 2020, tentang pembelakukan Pembatasan Sosial Berskala Besar (PSBB), berdampak pada upaya penanganan penularan virus corona-19. Akan tetapi pelaksanakan perbup tersebut juga berdampak pada aktivitas pendidikan. Penanganan Covid-19 yang tidak konprehensif dalam implementasinya, membuat dampak negatif terhadap pendidikan di kabupaten Majalengka, pemerintah kabupaten Majalengka tidak tanggap dengan kendala terbatasnya sarana tekonolgi didaerahnya khususnya desa-desa terpencil. Guru-guru harus terus mendekatkan diri terhadap murid-muridnya, agar pelayanan pendidikan dan pengajaran terus berlangsung. Murid tidak kehilangan haknya dalam belajar. Mungkinkah kondisi pendidikan di kabupaten Majalengka akan semakin terpuruk dimasa yang akan datang, karena penyediaan fasilitas teknologi pendidikan yang terbatas, ataukah adakah kebijakan yang lebih aplikatif untuk mensiasati keterpurukan pendidikan tersebut. Kata Kunci; Perbup, PSBB, Corona-19, Pendidikan, Majalengka.
Mining stochastic cellular automata to solve density classification task in two dimensions
Authors: Diaz Nestor , Tischer Irene
Published: February 2021

Density Classification Task (DCT) is a well-known problem that researchers have been tackling for more than two decades, where the main goal is to build a cellular automaton whose local rule gives rise to emergent global coordination. We describe the methods used to identify new cellular automata that solve this problem. The design of our cellular automata was carried out by a parallel genetic algorithm, specifically instantiated for this task. Our approach identifies both the neighborhood and its stochastic rule using a dataset of initial configurations that covers in a predefined and balanced way the full range of densities in DCT. We compare our results with some models currently available in the field. In some cases, our models show better performance than the best solution reported in the literature, with efficacy of 0.842 for datasets with uniform distribution around the critical density. The best-known cellular automaton achieves 0.832 in the same datasets. Tests are carried out in datasets of diverse lattice sizes and sampling conditions; we focused the analysis on the performance of our model around critical densities. Finally, by a statistical non-parametric test, we demonstrate that there are no significant differences between our identified cellular automata and the best-known model.
Determination of antioxidant capacity in blackberry (Rubus glaucus) jam processed by hydrotermodynamic cavitation compared with traditional technology
Authors: Rodriguez Bernal Jenny Marcela , Herrera-Ardila Yenny Mayerly , Olivares-Tenorio Mary Luz , Leyva-Reyes Manuel Felipe , Klotz-Ceberio Bernadette Francisca
Published: February 2021

The objective of this study was to determine the antioxidant capacity of blackberry (Rubus glaucus) jam processed by hydrothermodynamic cavitation (HTD) at different temperatures (25, 45, 60, and 75 °C) compared with traditional technology (TDE). HTD is a food processing technology based on the cavitation phenomenon for the simultaneous crushing, homogenisation, and pasteurisation of whole foods. Blackberries without any treatment were used as a reference. The results indicated that the content of phenolic compounds and their antioxidant capacity were directly correlated to the type of process and temperature. However, compounds with antioxidant capacity should be further assessed in order to determine the actual effect of this technology. In addition to this, during the development of this study, savings were achieved in production processes (factory and labor expenses) due to the use of this technology, such as a 50% cost reduction
Streaming or misbehavior, investigation on movie streaming or movie piracy
Authors: Derakhti Arman , Ramírez-Rivas Catalina , Ramírez-Correa Patricio Esteban
Published: February 2021

Nowadays, movie streaming is ubiquitous amongst the younger population, and it is a supposed substitute for movie piracy. Without prejudice to the previous, reasons of various kinds may cause users to download their favorite movies illicitly. The objective of this study is to identify if movie streaming increases movie piracy. For this purpose, an online survey of potential users of movie streaming services was conducted in Chile. The sample was divided into students and not students, and logit models were used to analyze the data obtained. The results indicate that, on one hand, movie streamers are intentions to engage the download movie illegally, and on the other hand, peer pressure explains movie piracy among students.
Identification of 90Sr and 204Tl beta radiation sources by energy distribution with a 3GEM detector
Authors: Fuentes Robayo Freddy , Gutierrez Salamanca Rafael Maria
Published: February 2021

This paper presents the performance of a 3GEM in terms of identification of high and low beta energy radiation sources through the energy distribution of the main beta radiation sources used for industrial application 90Sr and 204Tl. We compare the beta radiation theoretical energy loss into the drift zone with experimental energy distribution at different 3GEM voltages. The experimental results show that the Most Probable Value (MPV) of the fitted Landau distribution obtained from 90Sr and 204Tl obtained a degree of error lower than 14% in comparison to the theoretical calculation. Additionally, high energy beta radiation source (90Sr) is identified in comparison to low energy (204Tl) - taking into account the MPV and sigma values from the fitted Landau distribution. These results are essential to design and implement a new application that utilizes the performance and special characteristics of the 3GEM for beta radiation detection and identification.
Propuesta metodológica para el estudio de inundaciones en áreas de llanura con escasez de información
Authors: Borzi Guido Esteban , Cellone Francisco , Tanjal Carolina , Melendi Edoardo , Carol Eleonora
Published: February 2021

Las llanuras constituyen áreas de gran potencial para la producción agropecuaria afectadas frecuentemente por inundaciones. El objetivo del trabajo es utilizar una metodología que permita evidenciar bajo qué condiciones ocurren inundaciones en áreas de llanura con escasez de información base, tomando como caso de estudio a la cuenca del río Samborombón, situada en el centro-este de Argentina. Para esto fueron observadas imágenes satelitales Landsat y se realizaron balances hídricos diarios, para posteriormente realizar un análisis estadístico de recurrencia. Los resultados obtenidos evidencian que las inundaciones se ven influenciadas en gran medida por las condiciones hídricas previas del suelo. La metodología utilizada permite estimar períodos de retorno en cuencas de llanura de baja pendiente requiriendo solamente de imágenes satelitales de libre acceso y de datos de precipitación y temperatura media diaria, obteniendo resultados que reflejan el estado de la cuenca posterior a eventos de precipitación.
Determination of parameters and performance analysis of load models for fluorescent recessed lightings before power supply signal variations
Authors: Martínez Peñaloza Alejandra , Carrillo-Sandoval Luisa , Malagón-Carvajal Gabriel , Duarte-Gualdrón César , Osma Pinto German Alfonso
Published: February 2021

The high utilization of nonlinear devices in buildings increases harmonic distortion in the electrical voltage and current signals, which has led to the requirement of characterizing and predicting the impact of such devices on low-voltage networks using load models. One of the charges that still performs an important role in the energy consumption of commercial, industrial, and educational buildings is the recessed fluorescent light with electronic ballast, which is commonly used in Colombia. However, information regarding the modeling of their behavior in the case of distorted power supply voltages is scarce. Therefore, this work presents the parameter configuration and performance analysis of two load models in the time domain, i.e., ZIP and exponential, and one model in the frequency domain, i.e., Norton equivalent model to the coupled admittance matrix method, for two commonly used recessed fluorescent lights.
Valoración del sector de Media Luna, Aipe, Huila como geositio de patrimonio geológico
Authors: Muñoz Quijano Ingrid Natalia
Published: February 2021

El patrimonio geológico y paleontológico está constituido por bienes comunes a todos los ciudadanos; Estos bienes son parte de la riqueza natural de la nación y son trascendentales en muchos casos para la definición y comprensión de la historia y la dinámica del planeta Tierra. La selección de los Lugares de Interés Geológico - LIG (Geotopos y Geositios), para cada categoría; científico, didáctico y turístico-simbólico, se realiza puntuando cada uno de los parámetros de acuerdo a diferentes escalas, de acuerdo con la propuesta metodológica realizada por el Servicio Geológico Colombiano (SGC). El sector Media Luna (ML), ubicado en el Municipio de Aipe - Huila, tiene características geológicas que lo hacen representativo para reconocer los procesos geológicos que han ocurrido en esta región del país; Su evaluación permitirá definir si este lugar puede ser propuesto como Patrimonio geológico y adicionalmente, las posibles áreas de enfoque para Geoparques de la UNESCO.
Nickel laterite concentration through a non-conventional method with surface sulfidization
Authors: Bustamante Rúa Moises Oswaldo , Gonzalez Arias Sindy Dayanis , Bustamante Baena Pablo
Published: February 2021

Nickel ores are found mainly as sulfides and laterites in oxidized ores, such as iron oxides, which are usually “Ni-bearing”. This investigation determined the physical-chemical conditions necessary to increase the tenor and recovery in lateritic deposits, with the implementation of a new technology that allows the increase of the tenor (a process called “up-grading”). The froth flotation is proposed as a concentrating process to increase the Nickel content in the lateritic deposits. By means of sulfidization and direct flotation, specific hydrophobicity of the mineral is achieved, substantially improving the nickel concentrations in the process, with recoveries close to 86%, which, compared with conventional direct and inverse floats without effecting this activation with Na2S, results in recoveries of 70% and 16%, respectively. The reverse flotation also increases the Nickel content with an approximate recovery of 70%; however, the froth flotation, with activation Na2S is still better.
Analysis of the hospital supply chain in a Cuban territory
Authors: Acevedo Urquiaga Ana Julia , Sablón Cossío Neyfe , Acevedo Suárez José Antonio , González Rodríguez Yanara , Martín Marrero Anamaris
Published: February 2021

This research aims to develop and apply a methodology for the supply chain analyze in the hospital sector in Matanzas territory. The study is based on the maternity hospital of the territory, with the purpose of identifying the logistics performance and determining if there is a good relationship between the supply chain actors. To carry out the proposed objectives, a methodology is applied to characterize, diagnose and propose improvement projects for the hospital supply chain and its actors. The methodology adapted from a previous one and combined with different tools: checklist, flow chart; performance of group work techniques such as brainstorming and individual interviews. The results shows the lack of logistic integration between the actors, as the fundamental problem on the hospitals supply chains. This document illustrates how logistical problems affect the development of health care activities in terms of satisfying the client at the lowest possible cost. In addition, this constitutes one of the few investigations carried out in the country’s hospitals in with the supply chain focus.
Toxicity test for Fuller’s earth contaminated with dielectric oil using eisenia foetida earthworms and soils with different carbon contents
Authors: Cardona Gallo Santiago Alonso , Beltran-Perez Oscar Dario , Berrio-Giraldo Linda-Ivette , Agudelo Edison-Alexander
Published: February 2021

Fuller’s earth is an adsorbent material used in the electric industry for dielectric oil regeneration. The high amount of polyaromatic hydrocarbons removed from oil and adsorbed in the Fuller’s earth makes this material a hazardous waste. It is necessary to implement a toxicity test and apply a suitable treatment to safely dispose of this waste in a landfill or repurpose it for reuse. In this paper, the toxicity of Fuller’s earth contaminated with dielectric oil is assessed before and after treatment. The toxic potential of the Fuller’s earth and the dielectric oil extracted through decontamination processes was evaluated in two types of soil with different carbon contents, analyzing the effects on the test organisms, Eisenia Foetida earthworms. These tests showed that decontaminated Fuller’s earth is non-toxic, and that  the toxicity of the contaminated Fuller’s earth, or its extracts after treatment, represented by the median lethal concentration (LC50) depends significantly on the type of soil used.
Towards to author’s analytics: the case of DYNA journal
Authors: Velásquez Henao Juan David , Arango Londoño Adriana , Contreras Hernández Alex Santiago
Published: February 2021

In this article, systematic mapping of literature, business intelligence, descriptive analytics and tech mining techniques are used to generate insights to made data-driven editorial decisions and to formulate editorial policies. The proposed methodology is called author analytics in this work, and it has the aim of providing an integral view of the authors and topics of the journal and the authors, topics, documents, and journals citing the journal under review. The proposed methodology is applied to the DYNA (Colombia) journal. The proposed analysis reveals different and complementary points of view of the analyzed journal.
Construction of metal transfer modes maps for an ER4130 filler metal in GMAW process
Authors: Giraldo Barrada Jorge Enrique , García Viana Juan Camilo , Morales Galeano John Edison , Valencia Henáo Emanuel
Published: February 2021

Metal transfer modes (MTMs) maps were constructed for GMAW process using ER4130 and 98%Ar-2%O2 shielding gas. There is no available MTMs maps for this filler metal which is used to obtain matching strength in welds of AISI 4130/4140 steels. These maps serve as tools to establish the MTM given a welding current and voltage, which is useful when an engineer is trying to qualify welding procedures according to construction codes. The maps were built analyzing current and voltage signals recorded at 5000 samples/second during bead-on-plate welds. The main advantage of this methodology is its simplicity of instrumentation without expensive cameras, but has low resolution and it is difficult to identify finer characteristics of MTMs, such as subgroups (repelled globular, streaming, rotational spray), drop diameter, explosive transfer, etc. Several MTMs were identified in the signal analysis and grouped into natural MTMs (short circuit, globular and spray) and interchangeable modes (short-circuit-globular, globular-spray and short-circuit-globular-spray).
Determination of residual stresses in thermal barrier coating due to the amount of CMAS infiltration
Authors: Yáñez Contreras Pedro , León Rodríguez Miguel , Medina Flores José Martín , Jiménez García José Alfredo , Santander Bastida Francisco Javier , Yáñez Rodríguez José
Published: February 2021

In this work, we present the effect of the amount of CMAS infiltration into YSZ of Thermal barrier coatings (TBC) on the magnitude of residual stresses. The (TBC) were deposited by thermal spraying of CoNiCrAlY (Bond Coat-BC) and YSZ (Top Coat-TC) powders. The deposition of the BC was through the high velocity oxygen fuel (HVOF) system. The TC was deposited via an atmospheric plasma-spraying gun (APS). The TBCs were heat treated at 1250 °C, with a CMAS attack at a concentration of 10 mg/cm².The attack exposure was for 2 and 4 hours respectively. In this evaluation, the measured parameter was the magnitude of the residual stress state in Yttria Stabilized Zirconia (YSZ). The residual stress profiles were obtained using the Modified Layer Removal Method for Duplex Coatings (MRCMRB) and the Noda equations. An increase of 26.446 MPa was determined for 2 hours of thermal treatment and 30.743 MPa for 4 hours.
Spatial-temporal dynamics of Caatinga vegetation cover by remote sensing in the Brazilian semiarid region
Authors: Rodrigues Joez André de Moraes , Lopes Pabricio Marcos Oliveira , Silva Jhon Lennon Bezerra da , Araújo Hélio Lopes , Silva Marcos Vinícios da , Santos Anderson dos , Moura Geber Barbosa de Albuquerque
Published: February 2021

The Brazilian semiarid region is marked by water scarcity, which causes the loss of leaves from native vegetation to reduce transpiration. With the reduction of the Caatinga leaf area, the soil becomes more exposed, which makes it a great ally for environmental degradation. This study aimed to monitor and analyze the spatial-temporal dynamics of the Caatinga vegetation by orbital remote sensing in the semiarid region of Pernambuco, Brazil, in the rainy and dry season. The study was developed from Landsat-8 satellite images between the years 2013-2018. From the SEBAL algorithm, thematic maps of the biophysical parameters were determined: albedo and surface temperature, normalized difference vegetation index (NDVI), soil-adjusted vegetation index (SAVI), and leaf area index (LAI). The results show that in the dry season, there is a greater aptitude for environmental degradation to occur.
Estimation of anthropometric hand measurements, from ratio scaling method, for the design of sewn gloves
Authors: Rincón Becerra Ovidio , García Acosta Gabriel
Published: February 2021

This paper shows the estimation process of the hand’s anthropometric dimensions, for designing leather sewn gloves. Since there is not detailed information about hands in the anthropometric studies of the Colombian population, it was necessary here to use the ratio scaling method (RS) to estimate, 22 anthropometric dimensions. Subsequently, an anthropometric measurement was performed in a sample of 41 participants (18 female – 23 male), in order to compare the similarity between the measured and the estimated dimensions founding a correlation coefficient between 0.9396 and 0.9995, for male, and between 0.9587 and 0.9988, for female. It was found that the estimated dimensions have the required precision to use this information in the products design that involve a direct contact with human beings, which means that the measures can be obtained with a lower cost and in a faster way than with conventional anthropometric studies.
Influence of dynamic geometric parameters on multi-axis machining processes
Authors: Cifuentes Gómez Andrés Felipe , Cordoba Nieto Ernesto
Published: February 2021

By means of experimental, geometric and simulation models, roughness values of third and fourth order deviations are determined. The simulation environment is developed from the integration and simulated verification (ISV) in software NX 11 and the geometric approximations are validated through the analysis confocal microscopy.An experiment design is carried out to determine the influence of the dynamic geometric factors: transverse feed (Ae), lead angle and tilt angle, with a flat end milling tool with 1 mm diameter. In the experiment a 3k factorial model is presented to specify the factor with the greatest influence on the roughness. As a result, an optimum (minimum) roughness value is obtained. The lead angle has a moderate influence. Fourth order deviations are associated with the feed per tooth, with a constant angular speed of 5,000 rpm
Territorial and Electorate Size Influence: Participation/Competitiveness in Costa Rica’s 2016 Local Scale Elections
Authors: Azevedo Daniel Abreu de , Meireles Bruno Lessa
Published: February 2021

In recent years, political geography has begun to revisit traditional geographical theories using quantitative methodologies. Size, location, density, position, and other important geographic characteristics have reemerged as central data points in the analysis of political phenomena. In this article, we analyze possible relationships between size (territorial and electoral) and electoral outcomes (competitiveness and participation) in Costa Rica’s 2016 local (canton) elections. In this effort, we seek to revisit a tradition abandoned by some currents of geography, often erroneously associated with geographic determinism and widely criticized by geography researchers since the 1960s. Costa Rica was chosen for the study because it is considered one of the most successful democratic systems in Latin America, and it is now facing important issues about its new decentralization process. Linear Ordinary Least Squares (ols) regressions were used to analyze the 2016 elections in 82 Costa Rican cantones. This article reveals that there are important causal relationships between territorial size and electoral participation/competitiveness in Costa Rica. Conclusion Geographical analyses are crucial to understand voter turnout and competitiveness. Our conclusion could help Costa Ricans create new strategies to further develop their democracy and its decentralization process.
Propuesta de un indicador para evaluar la calidad climática urbana: estudio de caso en una ciudad media mediterránea chilena
Authors: Smith Guerra Pamela , Henríquez Ruiz Cristián
Published: February 2021

Las altas temperaturas, la fuerte radiación, la baja cobertura vegetal, la impermeabilización del suelo, entre otros factores urbano-climáticos, generan un gran disconfort y molestias a la población urbana. Aunque algunas de las características de las ciudades están reguladas por normativas ambientales (como la calidad del aire y el ruido) y urbanísticas (como los usos de suelo o las alturas de edificación), no existe un marco conceptual para determinar el nivel de calidad climática en la ciudad de manera integrada. La presente investigación propone un indicador innovador de Calidad Climática Urbana (CCU) a partir de una evaluación multicriterio que considera la consulta a expertos, el cálculo de factores climáticos y su espacialización en SIG. Como caso de estudio se aborda la ciudad media de Chillán, Chile, que posee una gran cantidad de horas diurnas afectadas por disconfort térmico en verano y episodios de muy mala calidad del aire en invierno. Se observa que existe una gran injusticia climática producto de las grandes diferencias entre las condiciones socioambientales y la CCU en diferentes barrios de la ciudad, que se traduce en que la población con mayores niveles socioeconómicos disfrute de mayor ccu en relación con los indicadores de los sectores más pobres.
Decolonialidad originaria latinoamericana y condicionamiento barroco del territorio novohispano: conventos, presidios y pueblos de indios
Authors: Costa Everaldo Batista da , Moncada José Omar
Published: February 2021

El barroco en Latinoamérica invoca conceptos y nociones relativos a diferentes campos disciplinares y, geográficamente, puede ser trabajado como síntesis estética de la historicidad política del espacio. Así, este artículo analiza los objetos geográficos que explican el condicionamiento barroco del territorio resultante de la colonización ibérica de América; en especial de Nueva España. Metodológicamente se trata (1) del complejo condicionamiento del territorio novohispano forjado por tres instituciones coloniales de posesión y control cartografiadas en este estudio: los conventos, los presidios y los pueblos de indios; y (2) se introduce la noción de decolonialidad originaria. La investigación revela que estos objetos amalgamados formaron los embriones de ciudades condicionados por el devenir de una mentalidad fundadora y un “ethos barroco”, paradójicamente estimulantes de una resistencia indígena, negra y mestiza en el continente. Ese condicionamiento moderno (o barroco) del territorio -reflejo de su total posesión real e imaginaria a través de la praxis jurídica, teológica y productiva colonial- constituye la fase de sacralización del espacio novohispano (siglos XVI-XVII).
Políticas habitacionales de mixtura social en escenarios de renovación urbana. El caso del Plan de Soluciones Habitacionales en la traza de la ex-Autopista 3, Ciudad de Buenos Aires, Argentina
Authors: Zapata María Cecilia , Gonzalez Redondo Carolina , Najman Mercedes , Corti Facundo
Published: February 2021

Este artículo analiza una política habitacional de mixtura social en un barrio en proceso de renovación urbana. Se aborda la implementación del Plan de Soluciones Habitacionales establecido por la Ley n.° 3.396/09 de creación del barrio Parque Donado-Holmberg en un tramo de la que debería haber sido la Autopista 3 de la Ciudad de Buenos Aires, Argentina. A partir del análisis de los modos de acceso a las viviendas sociales y las percepciones sobre las viviendas nuevas por parte de sus destinatarios, se evalúan las posibilidades de cumplimiento de los objetivos de mixtura social del programa implementado en un escenario de renovación urbana. Al mismo tiempo, se problematiza el modo en el que se resuelve la disputa por el derecho a la ciudad. Se recurrió a una metodología cualitativa; se recuperaron datos de fuentes secundarias y se construyeron datos primarios a partir de entrevistas en profundidad, observaciones no participantes y la realización de un mapeo colectivo entre julio de 2016 y mayo de 2018. La investigación muestra que, en un barrio en renovación urbana, la implementación de una política de acceso a una vivienda social resulta insuficiente para estimular condiciones de mixtura social.
Turismo y promoción en la provincia de Salta (Argentina). Las imágenes oficiales de la geografía turística provincial
Authors: Troncoso Claudia Alejandra
Published: February 2021

El artículo aborda la relación entre turismo, geografía e imágenes para dar cuenta de las formas en que las imágenes median la experiencia turística de lugares. Para ello analiza la promoción oficial del turismo de la provincia de Salta (Argentina) e indaga las principales ideas acerca de este destino. Esto se realiza teniendo en cuenta las imágenes que componen los materiales gráficos editados y distribuidos por el gobierno provincial (cartillas, libros, revistas, folletos, pósteres, mapas, etc.) desde 2007 a 2019. Los resultados señalan que en los últimos años se ha buscado diversificar la imagen turística de la provincia a través de la presentación de Salta como un lugar para la exploración inicial, donde se puede acceder a una herencia cultural variada que no ha experimentado cambios a lo largo del tiempo. El texto concluye señalando que, acompañada de tendencias recientes en el turismo y en el consumo, esta estrategia de mostrar lugares alejados o novedosos renueva el interés del turista por lo exótico, lo diferente y lo remoto, a la vez que permite la multiplicación de opciones de negocios turísticos en un contexto en el que lo nuevo suma a la diversidad necesaria para incrementar opciones de consumo.
Paleogeografía del canal y delta del Dique, Colombia
Authors: Vargas Cuervo Germán
Published: February 2021

En la corta historia geológica y geomorfológica de la llanura de inundación, canal y delta del Dique, localizada en la costa Caribe colombiana, se han presentado, en los últimos 500 años, notables cambios por procesos naturales y antrópicos que han modificado la geometría del canal y la morfología del delta, que han repercutido notablemente en la alta sedimentación de las bahías de Barbacoas y de Cartagena en el mar Caribe colombiano, pasando de una bahía a un delta, lo que ha causado problemas ambientales. En este artículo se presenta una reconstrucción de la paleogeografía y sedimentología del canal y delta del Dique a partir de elementos químicos que evidencian la presencia del mar en la zona continental. Se utilizaron métodos de análisis de documentos, mapas históricos, procesamiento e interpretación digital de imágenes de satélite, exploraciones directas del subsuelo, levantamientos geológicos y geomorfológicos detallados de campo, muestreo y análisis geoquímicos de sedimentos y rocas por métodos de fluorescencia de rayos X.
La etapa posminera: procesos y actividades asociadas, en cinco sitios del norte de México
Authors: Silva Ontiveros Letizia , Sánchez Salazar María Teresa
Published: February 2021

Las actividades mineras dependen de la viabilidad de extracción de recursos no renovables, por lo que las interrupciones del ciclo minero son algo intrínseco a la minería, al depender de factores económicos, sociales o técnicos que puedan llegar a obstaculizar su continuidad. Este artículo aborda la caracterización de diferentes tipos de interrupciones, englobados aquí dentro de lo que llamamos etapa posminera, haciendo énfasis en la percepción de la población que se vincula con los sitios donde se interrumpe la minería. Se toman cinco casos de estudio que reflejan distintos tipos de actividades y procesos posmineros, enmarcados en la situación que se observó en 2018, utilizando métodos cualitativos desde la geografía de la percepción. El aporte de la investigación radica en vislumbrar cómo se traslapan las acciones realizadas desde las empresas y gobiernos, contrastando con la percepción de las poblaciones que se vinculan con la minería. Este trabajo es un acercamiento a la comprensión de lo que sucede con los poblados y las poblaciones vinculadas a la minería una vez que esta cesa, y evidencia cómo se modifica la relación con el sitio y con su cotidianeidad a lo largo de la fase posminera de manera diferenciada en cada caso presentado.
Tendencje centralizacyjne w Polsce po 1990 roku – ciągłość i zmiana
Authors:   Katedra Systemów Politycznych, Wydział Nauk Politycznych i Studiów Międzynarodowych, Uniwersytet Warszawski, Polska, Wojnicki Jacek
Published: February 2021

The article discusses the issue of centralization tendencies in Poland. It constitutes an attempt to present this process in the context of the functioning of public administration in our country. The main research question is whether centralization was constantly present during the 30 years of creating a new model of public administration in Poland, or whether it was strengthened after 2015. The financial independence of local government units is also a crucial aspect of the analysis. The article correspondingly focuses on the resistance of the government administration during the implementation of local government reforms. Importantly, what is factored in as well is the change in the perception of the position and the role of local governments in the political system after the 2015 parliamentary elections by the new government camp. Analysis of the past provided the precedent premises for strong centralization tendencies, in particular, the traditions of the strong state administration of the Second Polish Republic after the May coup in 1926 and during the People's Republic of Poland.
A new extended log-Weibull regression: Simulations and applications
Authors: CORDEİRO Gauss M. , TAHİR M.h. , SOUZA VASCONCELOS Julio Cezar , ORTEGA Edwin M.m. , HUSSAİN M. Adnan
Published: February 2021

The induction of one or more parameter(s) in parent distributions opened new doors for flexible modeling in modern distribution theory. Among well-established generalized (G) classes for flexible modeling, the exponentiated-G, Marshall-Olkin-G and odd log-logistic-G families offer induction of one additional parameter while the beta-G and Kumaraswamy-G classes offer two extra shape parameters. The Marshall-Olkin-odd-loglogistic-G (MOOLL-G) family serves as an alternative to the beta-G and Kumaraswamy-G classes. A new motivation for the MOOLL-G family for competing risk scenarios, some useful properties, and parameter estimation are addressed. The new log-MOOLL-Weibull regression is useful for analysis of real life data. The accuracy of the estimates and the residuals is addressed via Monte Carlo simulations. The presented models outperform some other well-known models.