bluuebunny/crossref_metadata_2025 huggingface dataset:
Diseño y prueba de un robot móvil con tres niveles de complejidad para la experimentación en robótica
Authors: Gómez Felipe , Muñoz Francisco , Florián Beatriz E. , Giraldo Carlos A. , Bacca-Cortes Eval B.
Published: May 2020

Un robot móvil (llamado UV-BOT), fue diseñado en la Universidad del Valle para la experimentación en robótica y puede ser usado por personas con o sin conocimiento en robótica. UV-BOT es un robot diferencial y para uso en interiores; cuenta con sensores de proximidad, detección de luz, localización y comunicaciones, y su velocidad es controlada mediante dos controladores PI, uno en cada rueda. El firmware del robot fue diseñado usando un micro-núcleo de tiempo real conocido como FreeRTOS, que soporta tres niveles de complejidad, los cuales poseen un conjunto de funcionalidades desde el punto de vista de percepción, movilidad, comuno en la Universidad del Valle para la experimentación en robótica y puede ser usado por personas con o sin conocimiento en robótica. UV-BOT es un robot diferencial y para uso en interiores; cuenta con sensores de proximidad, detección de luz, localización y comunicaciones, y su velocidad es controlada mediante dos controladores PI, uno en cada rueda. El firmware del robot fue diseñado usando un micro-núcleo de tiempo real conocido como FreeRTOS, que soporta tres niveles de complejidad, los cuales poseen un conjunto de funcionalidades desde el punto de vista de percepción, movilidad, comunicación, programación y disponibilidad de demos. Estas funcionalidades son empleadas por la interfaz de usuario para programar el robot gráficamente (nivel básico), usando XML (nivel intermedio) o C (nivel avanzado). En su nivel avanzado, el robot soporta la programación orientada a comportamientos. Estos comportamientos fueron utilizados para realizar las pruebas de desempeño del robot móvil. Como resultado de estas pruebas, se encontró que el sistema de localización de UVBOT muestra una incertidumbre promedio de 17 cm. Los comportamientos de retorno (por posición y luz) y evasión de obstáculos muestran errores promedio de 15 y 12 cm, respectivamente. De este modo, con UV-BOT se pueden implementar exitosamente tareas básicas en robótica cooperativa.
Evaluación comparativa de redes KBANN y sistemas ANFIS para la localización de fallas en redes de distribución de energía eléctrica
Authors: Mora Juan J. , Pérez Lucas P. , Pérez Sandra M.
Published: May 2020

La regulación actual sobre calidad de la energía eléctrica enfatiza los requerimientos relacionados con la continuidad del servicio, aumentando así la importancia del problema de localización de fallas en redes de distribución de energía eléctrica. La oportuna localización de fallas acelera el procedimiento de restauración del suministro en redes de distribución. En este artículo se presenta una evaluación comparativa de dos enfoques para la localización de fallas. Estos enfoques combinan la lógica difusa, las redes neuronales y las reglas de experto, y utilizan registros de las componentes de frecuencia fundamental de tensión y de corriente medidas en la subestación de energía. Las pruebas realizadas en una red de distribución de energía muestran errores promedio inferiores al 5% en la localización de fallas, validando los enfoques propuestos en este trabajo.
Destrucción de aceites dieléctricos mediante oxidación en agua supercrítica: hacia una alternativa de proceso para tratamiento de bifenilos policlorados (PCBs)
Authors: Marulanda Víctor F. , Bolaños Gustavo A.
Published: May 2020

La oxidación en agua supercrítica ha demostrado ser eficaz en la destrucción de un amplio espectro de contaminantes orgánicos persistentes, incluidos los PCBs, de los cuales nuestro país cuenta con amplio inventario. En el presente trabajo se investiga la oxidación en agua supercrítica de aceite dieléctrico usado de transformadores libre de PCBs, como una primera etapa para determinar las condiciones de operación apropiadas que permitan destruir de una forma ambientalmente aceptable los aceites dieléctricos contaminados con PCBs. Todas las combinaciones de tratamientos del diseño factorial propuesto en esta investigación permiten obtener una destrucción prácticamente completa del aceite dieléctrico, las cuales resultan ser condiciones de operación moderadas y alcanzables a nivel industrial. Este trabajo, junto con trabajos similares de destrucción de residuos derial propuesto en esta investigación permiten obtener una destrucción prácticamente completa del aceite dieléctrico, las cuales resultan ser condiciones de operación moderadas y alcanzables a nivel industrial. Este trabajo, junto con trabajos similares de destrucción de residuos de PCBs, permite concluir que bajo las condiciones de operación propuestas para destruir el aceite dieléctrico puede ser factible destruir todos los PCBs por debajo del límite de detección siempre y cuando se garantice un tiempo de residencia superior a 15 segundos.
Traslación de medidas de distorsión a espacios de representación multi-resolución en análisis de imágenes
Authors: Ortíz Jaramillo Benhur , García Álvarez Julio César , Castellanos Domínguez Germán
Published: May 2020

Se presenta un método para el cálculo del Índice de Calidad (Quality Index - QI) en imágenes, que consiste en la combinación lineal de tres medidas de distorsión perceptuales, basadas en el Sistema Visual Humano y las cuales son proyectadas a un espacio multi-resolución utilizando operadores en el espacio wavelet; espacio en el cual se realiza la extracción de características, tales como homogeneidades, contornos y bordes. En la validación del método, el QI calculado se contrasta con un puntaje de observación media diferencial, que es calculado experimentalmente sobre un conjunto estándar de imágenes. Los resultados muestran que las técnicas multi-resolución permiten una descripción más adecuada de las métricas perceptuales, además, reduce el tiempo de cómputo, en la medida que las mediciones son prioritarias sobre los detalles. Así mismo, los procesos de medida se calculan sobre el mismo espacio de representación, evitando transformaciones adicionales para extraer características. La estimación propuesta del QI se prueba en una aplicación de detección de rostros, con el fin de determinar las condiciones mínimas de distorsión para efectuar la clasificación de las respectivas imágenes.
Descripción teórica y experimental del equilibrio de adsorción de soluciones iónicas en la superficie de los sistemas γ-Al2O3 y MoO3/γ-Al2O3
Authors: Machuca Martínez Fiderman , G. Fierro José L.
Published: May 2020

Se estudiaron las isotermas de adsorción en equilibrio de iones Mo, Co y Pt sobre γ-Al2O3 y iones Co y Pt sobre MoO3/γ-Al2O3. Los catalizadores molibdeno alúmina para los ensayos de adsorción fueron preparados por impregnación de los soportes de alúmina con heptamolibdato de amonio. Los datos de equilibrio de adsorción fueron obtenidos a partir del proceso de adsorción liquido-sólido. Las curvas de adsorción fueron tipo L para los sistemas Mo y Co sobre γ-Al2O3 y Co(Pt) sobre MoO3/γ-Al2O3, mientras para el sistema Pt(Co) sobre MoO3/-Al2O3 fueron tipo S. Para el caso del molibdeno, se encontró que las especies en solución (tetraédricas y octaédricas) afectan la adsorción del molibdeno. La adsorción de iones Co(II) sobre alúmina o alúmina modificada no depende de la alúmina utilizada. La forma de las isotermas de adsorción de iones Co sobre MoO3/γ-Al2O3 parece ser modificada cuando los iones Pt(IV) están presentes simultáneamente. Los procesos de adsorción de especies de Pt dependen de la presencia de Mo(VI) y Co(II) en la superficie de los soportes. Se observó que la cantidad de Pt adsorbido sobre MoO3/γ-Al2O3 disminuye en presencia de iones Co(II) en solución. Finalmente, se calcularon los parámetros de adsorción en equilibrio de los sistemas Mo(VI) and Co(II) sobre γ-Al2O3 and Co(II) y/o Pt(IV) sobre MoO3/γ-Al2O3.
Análisis y evaluación de la antena dipolo meandro
Authors: Estrada Juan G. , Páez Rueda Carlos Iván
Published: May 2020

En este artículo se presentan las curvas de diseño y la evaluación de la antena meandro construido con alambres en cuatro diferentes topologías con el objeto de ser diseñada para aplicaciones que requieran miniaturización. Se utilizó el kernel electromagnético NEC, a través del cual se construyeron diversas curvas de diseño que permiten encontrar los valores apropiados para el correcto funcionamiento de la antena. Las curvas de diseño fueron validadas por medio de la construcción y caracterización de cuatro diferentes prototipos, diseñados para un porcentaje de miniaturización del cincuenta por ciento (50%) comparado con un dipolo resonante lambda medios (lambda/2). La impedancia de entrada, el patrón de radiación y la ganancia máxima de la antena fueron evaluados experimentalmente en un punto de operación común a una frecuencia fija de VHF.
PESPAD: una nueva herramienta para la predicción de la estructura secundaria de la proteína basada en árboles de decisión
Authors: Mazo Claudia X. , Bedoya Oscar F.
Published: May 2020

Una de las tareas que actualmente enfrentan los bioinformáticos es la predicción de la estructura secundaria de la proteína. Este problema consiste en que dada una secuencia de aminoácidos, se debe predecir la estructura de cada residuo, siendo hélices y hojas las más comunes. A pesar de los avances que se han logrado al plantear modelos para la predicción de la estructura secundaria, se intenta mejorar su exactitud predictiva. En este artículo se presenta una nueva herramienta para la predicción de la estructura secundaria de la proteína, llamada PESPAD, que supera significativamente la exactitud predictiva de los métodos individuales existentes. La herramienta se apoya en modelos construidos con base en árboles de decisión para la mezcla de expertos.
Plataforma de seguridad basado en autenticidad de contenidos sobre conjunto de especificaciones SCORM
Authors: Montenegro Marín Carlos E. , Gaona García Elvis E. , Gaona García Paulo A.
Published: May 2020

Los mecanismos que se presentan en la mayoría de plataformas Learning Content Management Systems, (LCMS), no permiten evaluar el concepto de “autenticidad” en contenidos que se comparten en cada una de ellas con un buen grado de aceptación, por lo tanto, el siguiente artículo tiene como finalidad plantear un Modelo de seguridad informático sobre plataformas de aprendizaje virtual LCMS, mediante sus contenidos a través de las especificaciones dadas por Sharable Content Object Reference (SCORM), lo cual permita garantizar la autenticidad de contenidos mediante conceptos de firmas digitales e identificación de protocolos y mecanismos que garanticen este tipo de actividades. Para llevar a cabo esta actividad, se plantean alternativas de modelos de seguridad, partiendo por el análisis de los mecanismos de seguridad informáticos que se trabajan actualmente sobre la mayoría de plataformas LCMS, al igual que la identificación de componentes y variables desde el punto de vista del desarrollo de contenidos mediante las especificaciones SCORM. Finalmente se propone un modelo de seguridad para su implementación sobre el desarrollo de objetos de aprendizaje que permitan identificar niveles de confianza en los diferentes contenidos que se comparten dentro de una Plataforma LCMS.
Diseño, construcción y control de un simulador sísmico uniaxial tele-operable para modelos estructurales a pequeña escala
Authors: Coral Horacio A. , Ramírez José M. , Rosero Esteban E. , Thomson Peter , Gómez Daniel , Marulanda Johannio
Published: May 2020

Este artículo presenta el diseño, construcción y control de un simulador sísmico uniaxial para modelos estructurales de pequeña escala. Inicialmente, el documento muestra el diseño de cada parte del simulador hasta llegar a la construcción de todo el prototipo. Luego, se halla un modelo matemático del simulador utilizando un procedimiento de identificación en el lazo de velocidad que se valida mediante respuesta en frecuencia. A partir del modelo identificado se diseñan los controladores de los lazos de velocidad y posición, que proveen al sistema el desempeño requerido. Finalmente, se presentan varias pruebas para la validación del simulador sísmico y se describe la interfaz de control remota desarrollada en Java®, que permite al usuario definir las señales de excitación, visualizar los registros obtenidos de la prueba y observar el video en línea desde Internet.
Rediseño y optimización de una máquina dobladora de barras de acero
Authors: Arzola Nelson , Tovar Andrés , Gómez Alexander
Published: May 2020

Se presenta un procedimiento de evaluación del desempeño mecánico del sistema formado por la palanca y el rodillo seguidor de una máquina dobladora de barras de acero. Este procedimiento puede ser empleado con fines de diseño o rediseño orientado a sistemas existentes que requieran de mejoras. Se ilustra el procedimiento para el caso de una dobladora para fabricar ganchos de acero que ha tenido continuas pérdidas de funcionalidad por fracturas por fatiga, picadura del rodillo, consumo de potencia elevado y dimensiones de la barra doblada fuera de especificaciones. Se analiza el comportamiento elastoplástico del material de la barra con el fin de conocer la potencia de doblado requerida. Además, se lleva a cabo la definición de los factores de diseño fundamentales tomando en consideración los distintos mecanismos de falla encontrados en esta máquina. El resultado es un sistema de ecuaciones restrictivas que se resuelve para una función objetivo de capacidad de producción. Finalmente, se presenta el rediseño mejorado de la máquina dobladora con nuevas características funcionales.
Caracterización del comportamiento dinámico de la tribuna occidental del estadio Pascual Guerrero durante un concierto musical
Authors: Ortíz Albert R. , Marulanda C. Johannio , Thomson Peter
Published: May 2020

Durante el concierto musical llevado a cabo el 27 de diciembre de 2006 en el estadio olímpico Pascual Guerrero de Cali, se monitoreó la respuesta dinámica de la tribuna occidental debido a la excitación del público. Seis acelerómetros fueron localizados en diferentes puntos sobre un pórtico de concreto reforzado realizando una adquisición continua de datos. Este artículo presenta las frecuencias observadas en la respuesta de la estructura debidas a la interacción público-estructura durante el evento musical en el estadio. El resultado significativo de la investigación es la clasificación de la respuesta dinámica de la estructura para los géneros musicales que no han sido considerados en similares investigaciones: salsa, merengue, vallenato y reguetón.
Uso del análisis de correlación canónica para la predicción de la precipitación pluvial en Centroamérica
Authors: Alfaro Erik J.
Published: May 2020

Se usó un modelo basado en el análisis de correlación canónica, para explorar la capacidad de predicción de las estaciones lluviosas mayo-junio-julio (MJJ) y agosto-septiembre-octubre (ASO) en Centroamérica. Se usaron como variables predictoras las temperaturas superficiales del mar (TSM) en los océanos Atlántico y Pacífico para la región comprendida entre 112.5 ºE - 7.5 °W y 7.5 ºS - 62.5 °N, de 1958 a 1998. Para la primera parte de la estación lluviosa, MJJ, se notó que anomalías positivas (negativas) de las TSM en el Atlántico tropical están asociadas con anomalías positivas (negativas) de precipitación sobre un área amplia localizada al norte del istmo. Para la segunda parte de la estación lluviosa, ASO, signos opuestos de las anomalías en los océanos Atlántico y Pacífico, que circundan Centroamérica, estuvieron asociados con una notoria respuesta del campo de precipitación en donde anomalías positivas y negativas (negativas y positivas) de las TSM en los océanos Pacífico y Atlántico Tropical, respectivamente, tienden a estar asociadas con lóbulos de anomalías negativas (positivas) de precipitación, principalmente en la vertiente pacífica de Centroamérica. Se realizó la validación cruzada de los resultados del modelo mostrando una habilidad estadísticamente significativa sobre un área importante de la región en estudio.
Some observations on the material culture of Aboriginal fishing in the Moreton Bay area: implications for archaeology
Authors: Walters Ian
Published: May 2020

Assessments of suites of material culture items have often been used to characterize various aspects of human behaviour and cultural development. This has particularly been the case with regard to assessments of prehistoric fisheries (e.g. Anell 1955, Reinman 1967, Kirch 1982, Colley 1983:4-7). This paper presents some observations on the material culture of Aboriginal fishing in and around Moreton Bay, southeast Queensland, which derive from written and oral history relating to the eighteenth, nineteenth and twentieth centuries. They allow implications to be drawn about the way the fishery may have operated in the prehistoric period.
Some references to Aboriginal life in the Moreton region from Stobart's Journal (1853)
Authors: Love W.R.F.
Published: May 2020

In the previous issue of Q.A.R. it was noted that G.K.E. Fairholme had three articles published in the Proceedings of the Zoological Society of London in 1856 (Love 1984:97). Further research indicated that these were based upon information obtained during a trip down Moreton Bay in the company of the Lord Montagu party in 1853. This was revealed in the extensive Letter-Journal prepared by the Reverend Henry Stobart M.A., Tutor to Lord Montagu (Stobart 1896). It was compiled from letters he sent home to his mother in England. The Moreton Bay trip included Stradbroke Island, St. Helena Island, Pine River entrance, Bribie Island, Durundur, the Bunya scrub and Nerang Creek. Like Fairholme, Stobart writes about local aboriginal culture and thus provides a rare set of first-hand notes of use to archaeologists and culture historian alike.
The need for a taphonomic perspective in stone artefact analysis
Authors: Hiscock Peter
Published: May 2020

In Australia a number of taphonomic studies suggest that natural processes may cause stone artefacts to move vertically within a site (Stockton 1973, Hughes and Lampert 1977, Stern 1980), and to move around the landscape (Cane 1982). There seems to be a consensus amongst Australian archaeologists that, while stone artefacts may be moved vertically or horizontally, they are virtually indestructible. Consequently it is believed that interpreting artefact numbers and morphologies requires no taphonomic perspective at all.
Lithic occurences and stratigraphic problems at Turtle Rock (Hervey Range), North Queensland
Authors: Mardaga-Campbell Mireille
Published: May 2020

This paper looks at a number of aspects of the knapping or reduction sequences represented amongst the substantial quantities of lithic material which were collected during three successive excavation campaigns from 1977 to 1979 at Turtle Rock (Hervey Range), North Queensland. It presents the first detailed description of this material, and it also considers the principal stratigraphic problems encountered during those and subsequent excavation campaigns in 1981 and 1983, at least as far as these problems might effect attempts at understanding the site's lithic occurrences and at reconstructing their associated human behaviours. Preliminary accounts of work on Turtle Rock have appeared in Campbell (1978a, 1982b, 1984), Campbell et al. (1982) Coventry et al. (1980) and Mardaga-Campbell et al. (1982). The excavations themselves were carried out mainly as third-year under-graduate student training exercises.
A site catchment analysis: Walkunder Arch Cave, near Chillagoe, North Queensland
Authors: Birkett Charles
Published: May 2020

Walkunder Arch Cave, is a rich archaeological site with evidence of repeated human occupation during the Late Pleistocene and Holocene. It is located at the central base of Cape York Peninsula, North Queensland (144Âº 31'E and 17Âº 13'S) some 10km south of the township of Chillagoe. The site lies at the southern end of a belt of fossiliferous limestone towers which extends about 100km northwards into the Palmerville district. Numerous art sites have been discovered in the Chillagoe-Palmerville area but the Walkunder Arch region is particularly rich in archaeological campsites.
The Whitsunday Islands: initial historical and archaeological observations and implications for future work
Authors: Rowland M.J.
Published: May 2020

The Cumberland and Northumberland Island Groups, more commonly known as the Whitsunday Islands, form the largest offshore island chain on the east coast of Australia. Between 20ºS and 21ºS latitudes there are 37 large islands ranging in size from 10,931ha (Whitsunday Island) to 100ha and a further 96 islands less than 100ha in size. Combined they cover an area of 35,296ha or 3,529km². Some of these were surveyed for archaeological sites in September, 1982, as part of a continuing investigation of islands off the Queensland coast (Rowland 1980, 1982a and 1984).
The archaeology of art: excavations at Maidenwell and Gatton Shelters, southeast Queensland
Authors: Morwood M.J.
Published: May 2020

This paper presents the results of excavations at Maidenwell and Gatton Shelters, two rock art sites in S.E. Queensland. The work was undertaken as part of a research project concerned with a major theme in Australian prehistory - the development of social and economic complexity in Aboriginal society (e.g. Lourandos 1983, 1985; Morwood 1984). As foci for a range of symbolic activities, Maidenwell and Gatton Shelters have the potential to yield evidence for changes in the nature and intensity of social interaction, particularly in the context of evidence for economic, technological and demographic change (cf. Conkey 1978, 1980; Gamble 1982, 1983).
Editorial
Authors: Hall Jay
Published: May 2020

As 1987 comes to a close a very important piece of Queensland legislation is being repealed, an event which affects all archaeologists working in this state. I refer of course to the Aboriginal Relics Preservation Act 1967-76 which, since its enactment has served to protect Aboriginal cultural remains by making them the property of the crown. While it has come under quite a deal of fire over the years, especially for not providing for sites of Aboriginal cultural significance and for appearing to have little power to prevent the theft and vandalism of relics, it has worked quite well compared to similar acts in other states. I write now not to mourn its passing so much as to raise some skepticism regarding the piece of legislation that will take its place -- The Cultural Record (Landscapes Queensland and Queensland Estate) Bill.
Editorial
Authors: Hall Jay
Published: May 2020

As the table of contents indicates, this volume of QAR is dedicated to archaeological research in the extreme S. E. corner of Queensland. All but two of the papers fall under the umbrella of the Moreton Region Archaeological Project (MRAP) and represent a statement about the current aims of this long-term regional research program. By way of this editorial I have taken the opportunity to provide an historical backdrop to MRAP so as to inform the QAR readership of its development.
The Moreton Regional Archaeological Project (MRAP) stage II: an outline of objectives and methods
Authors: Hall J. , Hiscock Peter
Published: May 2020

The Moreton Region Archaeological Project (MRAP) was initiated as a long-term multi-stage regional project which sought to coordinate archaeological investigations being undertaken in S.E. Queensland. Since the project officially began in 1977 (see Hall 1980a), it has been successful in directing and integrating the work of numerous researchers, most of whom were students at the University of Queensland. MRAP is designed as a flexible research program comprised of three areal components (subcoastal zone, coastal zone and offshore island zone) and a number of stages. Stage I sought to identify the archaeological record of the study area and, through excavation and surface collection of materials from selected sites in all zones, develop a regional chronology and to identify patterns and questions relevant to the reconstruction of past settlement-subsistence patterns. This work was satisfactorily completed in 1987 and Stage II research, which essentially concerns the delineation and explanation of perceived changes in the region's archaeological record, has now been initiated. Thus, this paper, after setting the stage with a description of the environment and ethnohistory of the study area, summarizes the results of Stage I research and follows with a discussion of the objectives, methods, questions and approaches relevant to Stage II.
Brooyar Rockshelter: a late Holocene seasonal hunting camp from southeast Queensland
Authors: McNiven Ian
Published: May 2020

This paper details the results of an excavation undertaken at Brooyar Rockshelter, southeast Queensland during August 1987. The Rockshelter was excavated as part of a larger research project focused upon the adjacent coastal region of Cooloola (McNiven 1985). The excavation had two main aims. The first was to establish a chronological framework for backed blades in the Gympie-Cooloola region, thus providing insight into the antiquity of non-stratified open sites with backed blades in the region (e.g. sandblow sites at Cooloola - McNiven 1895:15, 26, 28) (cf. Hiscock 1986). The second aim was to obtain comparative information on subsistence activities located in the hinterland region of Cooloola.
Necessary conditions for quasi-singular controls in the stochastic optimal control problem with delayed argument
Authors: Мансимов Камиль Байрамали{ }оглы , Масталиев Рашад Октай{ }оглы
Published: May 2020

Рассмотрена задача оптимального управления, математические модели которых задаются нелинейными стохастическими дифференциальными уравнениями Ито с запаздывающим аргументом и диффузными компонентами, позволяющими учитывать действующие на систему случайные возмущения непрерывной природы.

В предположении выпуклости области допустимого управления получено линеаризованное необходимое условие оптимальности. Исследован квазиособый случай. Описаны общие необходимые условия оптимальности квазиособых управлений. Рассмотрены частные случаи.
Corrosion Inhibition of Carbon Steel in Extreme Sour Application Conditions
Authors: Adelusi Adedamola , Mok Wai Yeung , Olubodun Olaolu
Published: May 2020

Corrosion inhibition of carbon steel in sour oil and gas production at elevated temperatures (>100°C) and under high shear stress presents a major challenge for operators, especially when compared to inhibition under sweet conditions. The formation of insoluble iron sulfide scales such as pyrrhotite which are less dense and easily break under high shear presents a major challenge with localized corrosion in extreme sour applications. The main objective of this project was to develop a novel sour corrosion inhibitor solution, which would provide both general and localised corrosion inhibition under such extreme conditions.

This paper presents key findings from a laboratory protocol designed to select a candidate sour corrosion inhibitor for a sour application. The laboratory tests were carried out in Hastelloy™ C 276 autoclave test rigs designed specifically for high temperature, high pressure, and high shear conditions in a sour environment. The test conditions were 135°C, with a shear stress of 92 Pascal, CO2 and H2S partial pressures of 3.1 and 6.2 bara respectively.

White light interferometry was used for surface analysis of the carbon steel coupons after the tests to compliment the corrosion rate data.

Results from the project showed the performance of a novel sour corrosion inhibitor specifically designed for high temperature sour gas applications. The corrosion inhibitor showed significant improvement in general and localised corrosion inhibition against carbon steel material compared to the traditional corrosion inhibitors typically used in sour environments. The product identified from the project has shown to provide better protection for carbon steel pipelines under extreme sour production conditions. Cost analysis confirmed that the chemical application could offer a more cost effective solution than the option of using corrosion resistant alloys.
Catalisadores das Fake News: Uma Discussão Teórica no Âmbito Sociológico
Authors: Soares Silva Marina Maria
Published: May 2020

A desinformação está em ascensão nesta era intitulada de pós-verdade, e apresenta-se como um assunto capaz de permitir um amplo campo de investigação. Tendo em consideração as ameaças e consequências da desinformação, através de casos práticos dos últimos anos, é importante perceber no viés sociológico possíveis fatores que impulsionam as pessoas para a credibilização de inverdades. Com isso, o presente artigo propõe uma revisão de literatura, com trabalhos publicados de 2015 a 2019, e uma discussão sobre os possíveis fatores no contexto referido. Como resultado, foram apresentados insights capazes de trazer uma reflexão para investigações futuras.Desinformação; viés sociológico; fake news; catalisadores.
O Domínio da Razão Entre Freud e Platão
Authors: Efken Pedro Henrique de Oliveira
Published: May 2020

No presente artigo, busca-se demonstrar que o domínio da razão sobre a dimensão corpórea, território dos apetites, é um imperativo no projeto ético platônico e freudiano. Com efeito, assim como Platão concebe uma faculdade racional da alma que deve dominar a parte apetitiva, essencialmente ligada ao corpóreo, Freud concebe o psíquico como um aparelho forjado para dominar as pulsões que se originam no organismo e chegam à mente como exigência de trabalho em virtude de sua ligação com o corpo. Ao longo do artigo, será demonstrado que o domínio do corpóreo pela atividade racional é, em certa medida, análogo em Freud e em Platão.
Consciência e Intencionalidade na Fenomenologia de Edmund Husserl
Authors: Souto Ricardo Pinho , Neto José de Sá de Araújo
Published: May 2020

O presente artigo visa discorrer sobre um dos conceitos centrais na fenomenologia husserliana: o conceito de intencionalidade. De saída, ressalta-se que a consciência é necessariamente intencional por partir da relação básica constituída pelo par indissociável sujeito/objeto. Tal conceito - intencionalidade -, põe em destaque o movimento da consciência em direção ao objeto e, mais ainda, essa propriedade cumpre um caráter universal, fazendo-se presente no funcionamento psíquico do homem.
Plasma rico em plaquetas (PRP): classificação, mecanismos de ação e métodos de obtenção
Authors: Schneider Kurt Vinicius Menezes , Silva Ronald Bispo Barreto da
Published: May 2020

Objetivo: Esclarecer a comunidade da área da saúde na compreensão da dificuldade de padronização de um produto autólogo com grande capacidade de aplicação na medicina regenerativa e evidenciar sua classificação, mecanismo de ação e produção. Revisão bibliográfica: Empregado inicialmente na década de 1970 para prevenir hemorragia, o plasma rico em plaquetas (PRP) tem ampliado o seu campo de atuação devido à sua capacidade em medicina regenerativa. Utiliza o sangue do próprio paciente e consiste em uma fração do plasma com uma concentração de plaquetas maior do que o sangue original. O princípio de atuação é baseado principalmente na liberação de fatores de crescimento pelas plaquetas quando ativadas. Pode ser preparado de diversas maneiras e envolve centrifugação. Pode ter concentrações variadas de plaquetas e leucócitos. Devido à sua variabilidade na preparação e apresentação, é difícil interpretar os dados disponíveis na literatura. Várias maneiras de classificação foram propostas para ajudar na sistematização e comparação dos estudos. Considerações finais: O PRP é um produto que tem apresentado bons resultados em várias áreas da medicina regenerativa. O conhecimento do mecanismo de ação, métodos de preparo e classificação auxilia os profissionais de saúde a melhor entender essa nova terapia e incentiva a sua utilização.
Perfil epidemiológico dos pacientes internados por HIV no Brasil
Authors: Santos Ana Cláudia Freitas , Mendes Bárbara Samira , Andrade Caroline Ferreira , Carvalho Mariana Miranda de , Espírito-Santo Luçandra Ramos , D'Angelis Carlos Eduardo Mendes , Prince Karina Andrade de
Published: May 2020

Objetivo: Analisar o perfil epidemiológico dos pacientes internados por HIV no Brasil, no período de 2010 a 2019. Métodos: Trata-se de um estudo, retrospectivo, descritivo, quantitativo, de base documental. Os dados foram obtidos do Sistema de Informações Hospitalares do Sistema Único de Saúde (SIH/SUS), pelo Departamento de informática do SUS (DATASUS). Resultados: No período avaliado, foram registradas 338.966 internações por HIV no Brasil. A região Sudeste (37,6%) e Nordeste (25,5%), apresentaram maiores internações. No entanto, as taxas de mortalidade se concentraram nas regiões Norte (17,06) e Sul (12,19). A prevalência média de internações por HIV, foi maior na região Sul (26,6 casos) e menor na região Sudeste (15,8 casos). Houve predomínio no sexo masculino (63,9%), na faixa etária entre 30-39 anos (31,50%) e na cor/raça branca (37,76%). A respeito do regime e caráter das internações, 51,35% foram em hospitais públicos e 80,65%) foi por urgência. Observou-se um total de 41.101 óbitos (12,12%). A maior prevalência ocorreu entre pacientes do sexo masculino (51,48%) e a maior taxa de mortalidade ocorreu na faixa etária acima dos 70 anos (21,82%). Conclusão: A infecção pelo HIV e, consequentemente as internações em decorrência desse fator, ainda proporcionam altos custos para a saúde pública do país.
Fluorogenic Probe Using a Mislow-Evans Rearrangement for Time-Resolved Imaging of Hydrogen Peroxide
Authors: Pham Dianne , Basu Upamanyu , Pohorilets Ivanna , Croix Claudette M. St , Watkins Simon , Koide Kazunori
Published: May 2020

Hydrogen peroxide (H2O2) is a second messenger that mediates the biology of wound healing, apoptosis, inflammation, aging, neurodegenerative diseases, and more. Its presence has been fluorometrically imaged with protein- or small molecule-based sensors. However, only protein-based sensors have afforded temporal insights with the resolution of seconds. Small molecule-based fluorogenic probes are preferred for various reasons; however, current electrophilic chemosensors react with H2O2 slowly, requiring >20 minutes for a sufficient response. Here, we report a fluorogenic probe that selectively reacts with H2O2 and undergoes a [2,3]-sigmatropic rearrangement (seleno-Mislow-Evans rearrangement) followed by an acetal hydrolysis to produce a green fluorescent molecule in seconds. The mode of reaction is based on the umpolung of previously developed sensors; the probe acts as a nucleophile rather than an electrophile. The fast kinetics outcompete the reaction between thiols and H2O2, enabling real-time imaging of H2O2 produced inside the subcellular compartments of cells in 8 seconds. Further, the probe was able to recapitulate data previously observed only with a genetically encoded protein-based sensor. The present probe design provides a platform that can match the temporal resolution of protein-based H2O2 detection.
Molecular Docking and Dynamics Simulation Study of Telomerase Inhibitors as Potential Anti-Cancer Agents
Authors: D R Sherin , Manojkumar Thanathu Krishnan , Chandran R. Prakash , Nair Sobha V
Published: May 2020

Normal cells’ genomic identity is protected by telomeres and sometimes chromosomal instability was observed due to shortening of telomerase because of successive cell divisions. Reports indicate that telomerase length is crucial in determining telomerase activity which in turn leads to cancer initiation. It is reported that telomere length regulation has been identified as a plausible strategy for cancer diagnostics and treatment. In the present MS, we explored the telomerase inhibitory activity of catechin analogues and it’s oligomers using computational methods. The structural properties of different ligands discussed in the MS were computed using density functional theory. Conformational effect of different chromene subunit such as 2R, 3R conformations were explored using computational methods. The stereochemical contributions to receptor binding such as intra ligand π-interactions of these ligands were also investigated. We herein propose that these stereochemical aspects of catechins and their oligomers as the most vital factor deciding the effective binding with the N-terminal domain of telomerase which is an efficient strategy in cancer therapy.
The Influence of Fermented Mare’s Milk Processing Under Pressure of Gaseous Nitrogen on the Quality of Koumiss
Authors: Tatyana V. Kabanova  , Mariya V. Dolgorukova  , Sergey I. Okhotnikov  , Elena V. Tsaregorodtseva  , Sergey Yu. Smolentsev  , Ekaterina A. Savinkova  , Andrey V. Onegov
Published: May 2020

The urgency of the problem of increasing the nutritional qualities of mare's milk is that, it has versatile uses. Many people traditionally prefer koumiss made of milk with high fat content, as it has good taste, mouth-watering appearance, high calorie content, helps to increase liver weight. In many patients, including tuberculosis, hypotrophic and malnourished due to a long and serious illness, the latter aspect is an important part of treatment. In the production of raw materials for baby and diet food, first of all, it is necessary to achieve an increase in the protein and fat content of mares, as well as to stabilize the content of valuable components in milk during lactation. Therefore, the search for methods for correcting the composition of dairy raw materials is relevant to industry issues. This article presents the results on the research of influence of Hydro mechanical processing on the physicochemical and microbiological properties of mare's milk. Milk processing treatment by gaseous nitrogen was carried out at laboratory-patented system. This method has not had a negative impact on its physical and chemical characteristics, but significantly increased the bactericidal life. The introduction of pure cultures of koumiss leaven in processed and not processed raw milk has reduced the acidity build-up to the optimal value allowing increase in the life of koumiss.
Peculiarities of respiratory pathology of young cattle in the lower Volga region Russian Federation
Authors: Ivan I. Kalyuzhny  , Ivan A. Nikulin  , Aleksandr M. Gertman  , Andrey A. Elenshleger  , Sergey Yu. Smolentsev  , Olga A. Gracheva  , Dina M. Mukhutdinova  , Zulfiyat M. Zukhrabova
Published: May 2020

An important element in solving problems relating to the preservation of young cattle livestock and production increase of livestock products is a timely diagnosis, prevention and treatment of diseases of non-communicable etiology, among which one of the most common is bronchopneumonia. Therefore, the development of effective methods of treatment and prevention of this pathology is an urgent problem of veterinary medicine. Despite a large number of scientific researches, many issues of etiology, pathogenesis, treatment and prevention of this disease remain insufficiently studied, especially the state of the natural resistance of calves suffering from catarrhal bronchopneumonia, which is the basis for choosing a method of treatment and prevention of this disease. The disease leads to calves deep, sometimes irreversible disturbances of bronchopulmonary system functions. Lung function is one of the first to be disrupted, playing an important role in the protective immunological reactions of the body, through which there is an increase in virulence of microorganisms, which leads to the general intoxication and severe bronchopneumonia. The situation on non-specific bronchopneumonia of calves in the Lower Volga region is tense, but it is to the same extent as in other regions having problems with this pathology. It is obvious that the susceptibility of calves to respiratory diseases is formed under the influence of antenatal influences and is manifested in the presence of adverse environmental factors leading to depletion of reserves adaptation in the first months of animal life.  The obtained set of regional characteristics of bronchopneumonia of non-infectious etiology allows to consider this pathology as an indicator of the ecological unwell-being of big cattle herds in the Lower Volga region.
MAPK pathway mutations in head and neck cancer affect immune microenvironments and ErbB3 signaling
Authors: Ngan Hoi-Lam , Liu Yuchen , Fong Andrew Yuon , Poon Peony Hiu Yan , Yeung Chun Kit , Chan Sharon Suet Man , Lau Alexandria , Piao Wenying , Li Hui , Tse Jessie Sze Wing , Lo Kwok-Wai , Chan Sze Man , Su Yu-Xiong , Chan Jason Ying Kuen , Lau Chin Wang , Mills Gordon B , Grandis Jennifer Rubin , Lui Vivian Wai Yan
Published: May 2020

MAPK pathway mutations affect one-fifth of head and neck squamous cell carcinoma (HNSCC). Unexpectedly, MAPK pathway aberrations are associated with remarkably long patient survival, even among patients with TP53 mutations (median ∼14 yr). We explored underlying outcome-favoring mechanisms with omics followed by preclinical models. Strikingly, multiple hotspot and non-hotspot MAPK mutations (A/BRAF, HRAS, MAPK1, and MAP2K1/2) all abrogated ErbB3 activation, a well-established HNSCC progression signal. Inhibitor studies functionally defined ERK activity negatively regulating phospho-ErbB3 in MAPK-mutants. Furthermore, pan-pathway immunoprofiling investigations identified MAPK-mutant tumors as the only “CD8+ T-cell–inflamed” tumors inherently bearing high-immunoreactive, constitutive cytolytic tumor microenvironments. Immunocompetent MAPK-mutant HNSCC models displayed active cell death and massive CD8+ T-cell recruitment in situ. Consistent with CD8+ T-inflamed phenotypes, MAPK-mutant HNSCC patients, independent of tumor-mutational burden, survived 3.3–4 times longer than WT patients with anti-PD1/PD-L1 immunotherapies. Similar prognosticity was noted in pan-cancers. We uncovered clinical, signaling, and immunological uniqueness of MAPK-mutant HNSCC with potential biomarker utilities predicting favorable patient survival.
The Unemployment Cost of COVID-19: How High and How Long?
Authors: Şahin Ayşegül , Tasci Murat , Yan Jin
Published: May 2020

We use flows into and out of unemployment to estimate the unemployment rate over the next year. This approach produces less stark projections for the unemployment rate over the course of the next year than some of the more alarming projections that have been reported. Using our approach and assuming that the severest social-distancing measures will be lifted in June, we estimate that the unemployment rate will peak in May at about 16 percent but gradually decline thereafter and end the year at 7.5 percent.
The Effect of Guided Discovery Method and Learning Interest on Students' Understanding of Physics Concepts
Authors: Arafah Kaharuddin
Published: May 2020

This study aims to analyze differences in understanding of physics concepts between students taught using the guided discovery method with varied lectures, both overall, for high learning interest and for low learning interest. In addition to knowing the interaction between learning methods and learning interest in understanding students' physics concepts. To achieve this goal, an experimental study using a 2 x 2 factorial design was conducted. The population of the study was 193 students of class XI IPA of SMAN 18 Makassar in 2018/2019 Academic Year. The sample subjects of this study were taken through cluster sampling techniques, amounting to 64 people. Two classes as an experimental group were taught using the guided discovery method and two classes as a control class were taught with a varied lecture method. Data were analyzed using descriptive statistics and inferential satelistic two-way ANAVA at a significance level of 5%. The results of the descriptive analysis showed that the average score of understanding the physics concepts of the experimental group students was 18.57 with a standard deviation of 2.53. The average score of understanding the physics concepts of the control group students was 14.56 with a standard deviation of 2.86. The results of inferential analysis show that overall, there are differences in understanding of physical concepts between students taught using the guided discovery method and those taught with varied lectures. Further results, both for high learning interest and those with low learning interest, there are differences in understanding of physics concepts between students taught using the guided discovery method with varied lectures. Finally, the results obtained that there is no interaction between learning methods with interest in learning about understanding students' physics concepts.
The Digital Literacy of The First Semester Students in Physics Education
Authors: Rizal Rahmat , Rusdiana Dadi , Setiawan Wawan , Siahaan Parsaoran
Published: May 2020

Technology continuously facing the development requires a significant change for the community to master several competencies in using and utilizing various facilities in digital technology, including teachers as a component that plays a important role in education must be equipped with digital literacy. The purpose of this study was to obtain a digital literacy description of physics education students as preservice physics teacher in the first semester. This research was conducted using a descriptive method involving 80 first-semester physics education students at a university in Tasikmalaya. Data is collected by using tests and interviews. The instrument used was a valid and reliable digital literacy test as well as an interview guide. Data obtained is processed by determining the student score means and correlated with the results of the interview. The results showed that the mean of student’s digital literacy was 50 with a low category. Three digital literacy competency areas owned by students show that the mean literacy competency of information and digital data is 36 (low category), the mean of communication and collaboration competency is 68 (medium category), and the mean of digital content creation is 47 (low category).
Topical Issues of Professional Judgment Application in the Preparation of consolidated Financial Statements
Authors: Levina V. S.
Published: May 2020

The article considers the problem of the application of professional accounting judgment in the compilation of consolidated financial statements (CFS), which, according to the legislation of the Russian Federation, should be prepared in accordance with the international financial reporting standards (IFRS). The methodological basis of the study includes scientific developments of domestic and foreign scientists regarding the problems of the application of professional judgment in the framework of the compilation of consolidated financial statements (CFS). The research methodology involves studying the specifics of determining the existence of control as the basis for consolidation, examining the transformation of the concept of “control” in a historical context by analyzing the relevant and previously applied IFRSs, and examining the concept of the information value of consolidated financial reporting. An analysis of the complexity of determining the actual control of the investor over the object of investment has allowed us to draw a conclusion about the prospects of applying the concept of professional judgment in the Russian realities. The theoretical and practical significance of the study lies in the fact that the results of the study are intended for the effective application of the professional judgment of an accountant as a relatively new accounting and reporting tool in the process of generating consolidated reporting (CFS) by accounting professionals.