bluuebunny/crossref_metadata_2025 huggingface dataset:
Factors influencing the fault displacement-length relationship: an example from the Cantarell oilfield, Gulf of Mexico
Authors: Shunshan Xu , Nieto-Samaniego A. F. , Velasquillo-Martínez L. G. , Grajales-Nishimura J. M. , Murillo-Muñetón G. , García-Hernández J.
Published: April 2021

Asumiendo que la relación entre máxima longitud y máximo desplazamiento en las fallas es lineal, investigamos los efectos de considerar distintos componentes del desplazamiento, del nivel de observación, y la presencia de enlace de fallas. Para ello usamos datos de las fallas normales del bloque Akal, en el campo petrolero de Cantarell, localizado en el Golfo de México frente a las costas de Campeche. Los datos que se utilizaron fueron tomados de mapas de contornos de cuatro horizontes diferentes. Los resultados obtenidos pueden resumirse de la manera siguiente: (1) el desplazamiento al echado es mejor que el desplazamiento vertical para el análisis de la relación D-L; (2) utilizando fallas que muestran sus dos terminaciones se logran mejores coeficientes de correlación lineal entre D y L, que utilizando fallas con una sola o ninguna terminación; (3) los coeficientes de correlación (RL2) obtenidos para las gráficas D-L en cada horizonte son distintos, lo que indica que los valores de (RL2) son dependientes del nivel de observación.
Seismic waves and surface waves: past and present
Authors: Malischewsky Peter G.
Published: April 2021

La presente disertación fue presentada por el autor a raíz de una estancia de un año en la Universidad Nacional Autónoma de México. La fértil relación entre las ciencias de la tierra de América Latina con Alemania se remonta a Alejandro von Humboldt. Se analizan algunos aspectos de la evolución de la sismología en general, y en Jena en particular, que tocan el desarrollo de la teoría de ondas y específicamente, de las ondas superficiales. El trabajo fue presentado en el Gran Auditorio de la Universidad Federico Schiller en Jena, Alemania, como una conferencia invitada en ocasión de la celebración del Centésimo Aniversario de la Investigación Sismológica en Jena.
New 40Ar/ 39Ar ages from the Central Part of the Chiapanecan Volcanic Arc, Chiapas, México
Authors: Mora Juan Carlos , Layer Paul W , Jaimes-Viera Maria del Carmen
Published: April 2021

El Arco Volcánico Chiapaneco (AVC; CVA = siglas en inglés) se localiza en la porción central del estado de Chiapas, es una cadena de estructuras volcánicas alineadas en dirección NO-SE de aproximadamente 150 km de longitud. En su parte central el AVC está compuesto de al menos 10 estructuras volcánicas alineadas al Noreste y concentradas en fallas con rumbo NNOSSE asociadas al Sistema de Fallas Motagua- Polochic. Las estructuras son siete Domos Volcánicos (Huitepec, Amahuitz, La Iglesia, Mispía, La Lanza, Venustiano Carranza y Santotón), un Cráter de Explosión (Navenchauc), una Estructura de Colapso (Apas), y un Complejo de Domos Volcánico (Tzontehuitz). En este trabajo, reportamos 13 nuevas edades de rocas de los siete domos que incrementan las dataciones disponibles para la actividad volcánica durante el Cuaternario, en la parte central del Arco Volcánico Chiapaneco. Con las nuevas dataciones y las reportadas en bibliografía se tiene al Complejo de Domos Tzontehuitz como la estructura más antigua 2.1 Ma y al Domo Volcánico Venustiano Carranza como el de actividad más reciente de 0.225 Ma.
Vertical structure of tidal flows at the entrance to Guaymas Bay, Mexico
Authors: Gómez-Valdés. José , J.  Vázquez. Heriberto
Published: April 2021

Se estudia la estructura vertical de los flujos de marea a partir de 144 días de observaciones realizadas por un ADP anclado al fondo en la entrada de la Bahía de Guaymas, cuya área es de 33.6 km2y se encuentra en una región semiárida. Se aplicaron métodos de análisis armónico a las series de tiempo de velocidad y a las series de tiempo de elevación del nivel del mar, para extraer los parámetros de las elipses de marea y para calcular amplitudes y fases de la marea. También se analizaron dos series de tiempo del nivel del mar adicionales obtenidas antes del experimento en sitios interiores de la bahía. Las corrientes barotrópicas de marea de mayor importancia fueron la K1 y la M2, estuvieron alineadas con la topografía de la entrada y mostraron amplitudes máximas de 7.8 Â± 0.2 cm s-1 y 7.4 Â± 0.3 cm Si,- respectivamente. Mientras que la corriente de agua somera de mayor importancia fue la M4, con una amplitud máxima de 1.0 Â± 0.2 cm s-1. Debido a que la bahía cumple con la condición de cuerpo de agua pequeño, los principales movimientos de marea mostraron características de onda estacionaria. La estructura del perfil vertical de la corriente fue parabólico, lo que sugiere que la corriente barotrópica fue afectada por procesos de capa límite, además el perfil promedio de las corrientes confirmó la formación de una circulación estuarina inversa. Las corrientes de marea diurnas rotaron contra las manecillas del reloj en la capa superior y con las manecillas del reloj en la capa inferior, lo que sugiere que fueron moduladas por la estratificación.
Looking for active faults at east Qattara depression, northwestern desert, Egypt
Authors: Rabeh Taha
Published: April 2021

Los datos del campo potencial son considerados el principal factor que sustenta los procesos de exploración geofísica, utilizados para detectar y evaluar las estructuras del subsuelo. En este caso se realizó en el campo una recopilación detallada de datos magnéticos en el área escogida anteriormente para la investigación sísmica. El objetivo principal de este estudio, es detectar las estructuras más profundas del subsuelo y investigar las posibles relaciones de estas estructuras con la actividad sísmica. El mapa de RTP aeromagnéticos fue usado para detectar la extensión regional de las estructuras de interpretación a partir del trabajo de prospección magnética. Las interpretaciones fueron realizadas en mapas RTP del terreno y aeromagnéticos utilizando, técnica de filtrado, separaciones del mínimos cuadrados, análisis de tendencias tectónicas, análisis espectral, el método de Werner, y Euler y dos técnicas de dimensiones. Los resultados muestran que las principales tendencias tectónicas dominantes son N35° Â­ 45°W, N45°Â­ 65° E, E Â­W y las tendencias de Aqaba. Por otra parte WQ85 dos líneas sísmicas-31B y 127 fueron interpretados y la localization de estas líneas son coincidentes con el mapa tectónico deducido. Los resultados muestran que existe una gran coincidencia entre la ubicación de las fallas deducidas de los datos geomagnéticos y sísmicos. Los resultados obtenidos indican una buena relacion con los datos de pozos. Además, estas estructuras están relacionadas con las actividades del terremoto registrado por el National Egyptian Seismological Network (ENSN). La correlación permite deducir que la zona de estudio es más estable que otras áreas adyacentes en el norte de Egipto, cerca del mar Mediterráneo y el río Nilo Delta.
Declining productivity in geothermal wells as a function of the damage effect
Authors: Aragón-Aguilar Alfonso , Izquierdo-Montalvo Georgina , Arellano-Gómez Víctor , Verma Mahendra P. , Belín-Morales Ma. Guadalupe
Published: April 2021

La curvaÂ­tipo geotérmica afectada por daño sirve para determinar el efecto de daño en un pozo y para caracterizarlo. Esta metodología puede ser aplicada para determinar el efecto del daño en los pozos que no pueden ser retirados de la explotación continua. Comúnmente se emplean los análisis de las pruebas transitorias de presión, cuya ejecución es tardada. En los pozos analizados, el efecto de daño aumenta con su tiempo de explotación y está relacionado con el deterioro en la producción. El conocimiento del daño ayuda a la toma de decisiones acerca de las operaciones a aplicar en el pozo con el objeto de mejorar su productividad.
Hydrostratigraphy of Haftad Gholle Karst, Markazi province, Iran, optimized by Fuzzy Logic
Authors: Rad Mostafa Yousefi
Published: April 2021

Este trabajo presenta la litología kárstica de la región de Haftad Gholle en el SE de Arak, Irán empleando el enfoque de lógica borrosa. El área fue dividida en 7 mitades litológicas. El resultado permitió identificar los recursos del agua óptimos en las calizas macizas del Cretácico Inferior.
KAMUSAL ALAN BAĞLAMINDA ÇAĞDAŞ SANAT SÖYLEMLERİ
Authors: ÇEVİK Naile , BİNGÖL Mehtap
Published: April 2021

Kentler, ortak yaşam alanları olarak bireysellikten uzak, kolektif bilinç üzerinde temellenen, ilişkisel, etkileşimli, toplumsal hareketin çeşitli biçimlerinin varlık gösterdiği alanlardır. Kültürel etkileşimin yoğun olduğu, aidiyet duygusunun arttığı kentsel mekânlarda sanat uygulamaları, kentin kimliğinin görsel bir ifadesi olarak belirmekte ve her kesimden insanın ulaşabileceği sergi mekânları olarak değişen/dönüşen yeni anlamlara ulaşmaktadır. Bu çerçevede, çalışmada kamusal alanın farklı bireysel kimlikleri bir araya getiren bütünleştirici yapısı üzerinde şekillenen çeşitli sanat ifadeleri tartışmak amaçlanmaktadır. Araştırma betimsel yöntem ile gerçekleştirilmiştir. Araştırma kapsamında Almanya’da bir sanatçı kolektifi olan Inges Idee’nin kamusal alandaki projeleri, Doris Salcedo ve Tomas Saraceno’nun enstalasyonları, Pieterjan Gijs ve Arnout van Vaerenbergh ikilisinin boşluk uzay deneyimlerine odaklanan “labirent” projesi ve Tauba Auerbach’ın Flow Seperation adlı kamusal alan projesine yönelik dikkat çeken özgün tasarımı, içerik ve biçimsel yönden ele alınarak değerlendirilmektedir. Araştırma sonucunda farklı kamusal sanat projelerinin özgün bakış açıları değerlendirilmiştir.
Photonic quantum data locking
Authors: Huang Zixin , Rohde Peter P. , Berry Dominic W. , Kok Pieter , Dowling Jonathan P. , Lupo Cosmo
Published: April 2021

Quantum data locking is a quantum phenomenon that allows us to encrypt a long message with a small secret key with information-theoretic security. This is in sharp contrast with classical information theory where, according to Shannon, the secret key needs to be at least as long as the message. Here we explore photonic architectures for quantum data locking, where information is encoded in multi-photon states and processed using multi-mode linear optics and photo-detection, with the goal of extending an initial secret key into a longer one. The secret key consumption depends on the number of modes and photons employed. In the no-collision limit, where the likelihood of photon bunching is suppressed, the key consumption is shown to be logarithmic in the dimensions of the system. Our protocol can be viewed as an application of the physics of Boson Sampling to quantum cryptography. Experimental realisations are challenging but feasible with state-of-the-art technology, as techniques recently used to demonstrate Boson Sampling can be adapted to our scheme (e.g., Phys. Rev. Lett. 123, 250503, 2019).
Peran Komite Sekolah Dalam Peningkatan Mutu Pendidikan Madrasah
Authors: Ramli Ramli
Published: April 2021

Abstract

One form of actualization in Indonesian education was the establishment of a body called School Committee that replaced the existence of the Education Organizing Body (BP3), stipulated through the Decree of the Minister of National Education No. 044/U/2002 dated April l2, 2002. The name of BP3 was changed into the School Committee due to the need of full community involvement in improving the quality of education. One of the objectives of the school committee is to increase the responsibility and participation of the community in the implementation of education in the education unit. In this present study, the focuses were on the process and the mechanism of the formation of the madrasah (Islamic school) committee organization, the planning carried out by the madrasah committee in improving the quality of madrasah education, and the implementation of the madrasah committee programs in improving the quality of education in Aceh Besar District. This study employed qualitative research methods. Data were collected through observation, interviews, and documentation. Findings showed that the process and the mechanism in forming the madrasah committee in Aceh Besar District were based on the decision of the Ministry of Education on the establishment of community-based organizations, including by mutual deliberations or meetings held every 3 years in a transparent, accountable, and democratic manner, and by involving the community as an education unit partner. Further, the planning of the madrasah committee in improving the quality of madrasah education was carried out by establishing the structure of the committee and holding regular meetings with madrasahs and the community every three months or at the end of each semester, and also by preparing and organizing religious and national holidays together with other madrasahs. In addition, the madrasah committee programs were well implemented in Aceh Besar, as seen from the involvement of all elements from both madrasahs as the organizers of the activities and the community as the provider of advice and input. The programs included the religious and the extracurricular programs in collaboration with the sub-districts and district of Aceh Besar.
Neurosífilis
Authors: Hernández Rojas Enrique Steff , Ariza Varón Michael Andrés
Published: April 2021

La neurosífilis, causada por la espiroqueta Treponema pallidum, con una incidencia de 0,47-2,1 casos por 100 000 habitantes, puede generar neuroinvasión desde etapas tempranas de la infección. Se conoce como "la gran simuladora", con manifestaciones que incluyen casos asintomáticos, compromisos parenquimatosos (encefálicos o medulares) o afectación meníngea con daño vascular asociado. El diagnóstico se basa principalmente en pruebas treponémicas y no treponémicas, tanto séricas como en líquido cefalorraquídeo (LCR). Aquí Un VDRL positivo es la prueba más específica para el diagnóstico, sin embargo, debido a su limitada sensibilidad, ciertos cambios citoquímicos en un contexto clínico adecuado permiten sospechar la enfermedad. Los pacientes con VIH suponen un reto especial. El tratamiento con penicilina cristalina sigue siendo la primera opción terapéutica a dosis de 3-4 millones de unidades IV cada 4 horas o 24 millones de unidades en infusión continua por 10-14 días. En algunos casos se requiere desensibilización o esquemas alternativos. La reacción de Jarisch-Herxheimer secundaria al tratamiento antibiótico es imprevisible y puede generar graves complicaciones, por lo que se recomienda prednisolona 40-60 mg al día por 3 días, iniciando 24 horas antes de la primera dosis de antibioticoterapia. El seguimiento del LCR suele ser útil y necesario.
Toxocariosis
Authors: Quintero-Cusguen Patricia , Gutiérrez-Álvarez Angela María , Patiño David Ríos
Published: April 2021

La toxocariosis humana es una helmintozoonosis por invasión de las larvas de la especie Toxocara al organismo humano. Se adquiere al ingerir los huevos de larvas por falta de higiene de las manos, consumo de vegetales y carnes crudas, geofagía y aguas no tratadas. El serodiagnóstico se realiza por Elisa o Western Blot. Es una enfermedad altamente prevalente, en especial en países tropicales, en vía de desarrollo y sobre todo en áreas rurales. Hay diferentes formas de presentación clínica y entre ellas la del compromiso del sistema nervioso central. Su tratamiento es con antihelminticos.
Reporte de caso de hemorragia cerebral como presentación inicial de meningioma en un hospital de III nivel en Colombia
Authors: Francisco-Corredor Alex , Lastra-Teran Orlando , Moreno-García Santiago
Published: April 2021

La presentación inicial de los tumores cerebrales depende en gran medida de su localización y las estructuras que se encuentren adyacentes, y en algunos casos pueden tener un curso asintomático. Sin embargo, una de las causas poco frecuentes pero bien conocidas de hemorragias intracraneales espontáneas, es la presentación inicial de tumores cerebrales primarios y secundarios. En este artículo se presenta el caso de un paciente de 72 años que ingresó al servicio de urgencias con alteración del estado de conciencia y hemiparesia braquiocrural izquierda. Al examen físico presentó cifras tensionales elevadas, por lo que se realizó una tomografía de cráneo que puso en evidencia una lesión ocupante de espacio con efecto de masa y características que sugirió una hemorragia intratumoral, la cual requirió drenaje y resección del tumor extraaxial. Posteriormente, el resultado de la patología reveló un meningioma atípico grado II.
Enfermedad cerebrovascular en pacientes jóvenes: aspectos claves de la literatura
Authors: Conde-Cardona Giancarlos , Medrano-Carreazo Juan Camilo , Parada-Artunduaga Michelle Daniela , Maldonado-Brigante John Mario , Quintero-Marzola Iván Dario , Yepes-Caro Jorge Armando , Moscote-Salazar Luis Rafael
Published: April 2021

La enfermedad cerebrovascular (ECV) es una patología con una alta tasa de morbimortalidad. Los adultos jóvenes, que se ubican entre las edades de 15 a 50 años, representan hasta el 15 % de los casos. Aparte de los factores de riesgo tradicionales, también se observan otros factores como: consumo de cannabis, cocaína y metanfetaminas. La ECV de origen isquémico sigue siendo el evento cerebrovascular más frecuente, sin embargo, el porcentaje del hemorrágico aumenta en comparación con el resto de la población adulta. Otras causas incluyen: malformaciones arteriovenosas, aneurismas, cardiopatía embolica, enfermedades autoinmunes, trombofilias, entre otras patologías. La clínica es muy variada, pudiendo cursar con síndrome piramidal caracterizado por hemiplejia o hemiparesia, alteraciones en la marcha, hiperreflexia, hipertonía e hipotrofia. Además, el paciente puede presentar afasia, crisis epilépticas y síndrome vestibular. Sin embargo, existen casos en los que no se evidencian factores de riesgo clásicos y el diagnóstico etiológico se vuelve un reto, haciendo necesario la realización de estudios más especializados en búsqueda de la patología de base desencadenante. El abordaje terapéutico siempre va a estar acompañado de la detección y el manejo de la causa desencadenante.
Behavior of a draining mixture composed by recycled concrete aggregates and rubberized asphalt concrete
Authors: Bastidas-Martínez Juan Gabriel , Rodríguez-Joaquín Nicolás Infante , Torres-Daza Hernán Darío , Rondón-Quintana Hugo Alexander , Ruge-Cárdenas Juan Carlos
Published: April 2021

Concrete waste is considered an environmental liability with a negative impact. However, this type of waste presents a high potential to be used as an alternative building material. Therefore, the present study aims to evaluate the applicability of substituting the conventional natural stone aggregate (CA) of a draining asphalt mixture (MD) by a recycled concrete aggregate (RCA). Firstly, RCA was physically characterized to be compared with the AC. Then, two MD mixtures were design with rubberized asphalt concrete (GCR by its spanish acronym): one using the conventional aggregate (control sample) and one with the RCA substituting entirely the CA. Experimental tests under monotonic load (indirect tensile strength - RTI) were conducted over the mixtures, as well as  adhesion tests (susceptibility of RTI in wet and dry conditions and abrasion wear Cantabro). The results indicate that for MD mixtures with RCA, a higher content of asphalt is required than with CA. Additionally, it wasfound that the presence of higher asphalt content in MD-RCA mixtures increases its adhesion when compared with the control sample. Therefore, it can be concluded that the use the RCA for MD mixtures, in the proposed way, is technically and environmentally viable.
Journals in engineering and technology: evaluation and analysis of the incidence of the Publindex classification model
Authors: Sáenz-Suárez Mayerly Ivonne , Uribe-Forero Luisa Fernanda , González-Estrada Octavio Andrés
Published: April 2021

This paper presents a descriptive study and scientometrics analysis to evaluate the incidence of the classification model of scientific journals Publindex in the behavior of Colombian journals in the area of Engineering and Technology. Qualitative and quantitative criteria were compiled, the production and contents of the journals were studied, and the national journals of the Engineering and Technology area were compared with the international journals of the same area. As a result, it is concluded that the implementation of the new categorization model served as a stimulus to boost the impact and improve the management of Colombian scientific journals in the study area. However, there is evidence of the need to implement models of editorial management and editorial policies (publication languages, periodicity, type of peer review, number of articles published, etc.) of international journals, and to rethink the classification model of scientific journals in Colombia incorporating guidelines that allow an objective evaluation based on the standardization and control of citation patterns.
La Prospectiva de la Gerencia Estratégica y la Responsabilidad Social Empresarial de las Empresas en Colombia
Authors: Rojas-Pérez Angie Karina , Capacho-Rodríguez Karen Dayana , Casadiego-Duque Yair Rolando
Published: April 2021

El presente artículo tiene como objetivo general Desarrollar la prospectiva de la gerencia de las empresas, desde gestión estratégica, la responsabilidad social del empresario en el marco del desarrollo productivo que brinde sostenibilidad, lo cual es la expectativa que todo comerciante debe tener en la dirección de sus negocios y ante la realidad de la economía que viven los países visionarios y futuristas. Se realizó una investigación de tipo descriptiva, basada en fuentes secundarias, sustentada en fuentes provenientes de revista científicas, textos, tesis y demás publicaciones de acreditada confiabilidad. Se concluye que la empresa a través de su evolución, ha superado las crisis económicas, políticas, jurídicas, sociales, ambientales y de sostenibilidad, que la han mantenido a través del tiempo, así como la gerencia estratégica es indispensable en las organizaciones ante la flexibilización de cambiar las estructuras de la misma para responder a los cambios significativos, con responsabilidad social con el medio y la sociedad donde ella convive.
Un reencuentro entre la historia y la contabilidad
Authors: Cepeda-Torres Yuliana Andrea , López-Contreras Luz Eliana , Durán-Caicedo Luz Estela
Published: April 2021

El presente trabajo tiene como objetivo analizar la historia de la contabilidad dentro de la evolución de la humanidad, así mismo se realizó un proceso de documental científico el cual toma diferentes tipos de documentos que le permite indagar sobre el tema teniendo presente los puntos de vista de cada uno de sus autores, el cual brindan datos e información que ayuda a recopilar y redescubrir ciertos momentos significativos que dieron paso a grandes descubrimientos, hechos que enfatizan cientos de años de recorrido de conocimientos y aprendizajes contundentes para la subsistencia de la vida misma; del mismo modo la contabilidad se ha visto como una herramienta sutil e incomparable con otras, dado que esta maneja principalmente la economía de una nación, sus progresos, el ámbito laboral de las personas para el sustento de sus familias, que se ha ido innovando desde hace más de 600 años, donde surgieron elementos como la escritura, los números , los conceptos de propiedad y la aceptación de una unidad de valor, que mostraron ser los factores más sobresalientes para la creación de un mundo extraordinario. Más aun  revelaron la fórmula de ser mejores, de cómo las matemáticas, pueden ser un eje principal de esta columna que ha envuelto en un camino comercial, con ideas, formas de atraer la atención y prosperar, pero sobre todo que da una guía para no cometer errores y enseñar de una manera más compleja ese universo extraordinario que muchas veces los mismos estudiantes no comprender por el simple hecho de no querer conocerlo. Por consiguiente, estos momentos históricos permite conocer y analizar que todo esto se basó en la misma necesidad del hombre, dependiendo de la época, su cultura, sus pensadores que tomaron esta fuente como el devenir de un futuro exitoso.
Planes de marketing en las pymes sector calzado de la ciudad de Cúcuta
Authors: Bustamante Díaz Luis Alfredo , Díaz Machuca Darly Karolayn , Pinzón Ayala Wilker David , Zambrano Martínez Nathaly Melissa , Barrientos Rosales Maria de los Angeles
Published: April 2021

El propósito de este trabajo fue conocer como manejan los planes de marketing las empresas del calzado en la ciudad de Cúcuta, esto por cuanto las bondades que brinda el marketing es fundamental para la competitividad de la organización y así la de su desarrollo, con esto se tiene que la utilización de estas herramientas de publicidad fomentan a una empresa a elevar sus actividades y a darse a conocer en los diferentes contextos para posicionarse, y más el sector del calzado siendo un sector importante en Norte de Santander que necesita mejorar sus desempeños publicitarios. De la misma manera esta investigación se realizó bajo un enfoque cuantitativo ya que se aplicó una encuesta en el sector para poder develar de que manera era la utilización del marketing en las pymes del sector.
Revisión de literatura del 2015 a 2021 de los métodos Multicriterio MCDM
Authors: Tapia Alarcón Beatriz Yolanda , Pérez Domínguez Luis , García Alcaraz Jorge Luis , Hernández Hernandez Jesús Israel
Published: April 2021

El objetivo principal de este artículo es proporcionar una revisión de la literatura del Método de toma de decisiones multicriterio (MCDM). En este estudio presentamos la clasificación y una breve descripción de lo que son los métodos multicriterio que son más utilizados actualmente y un listado de las aplicaciones más utilizadas de estos métodos por año y autor. En este artículo se han revisado un total de 50 artículos, que fueron publicados desde el año 2015-2021, los artículos fueron revisados e investigados en diferentes bases de datos y en revistas de alto rango como Google escolar, Perish, Scopus, ProQuest, Science direct con el fin de obtener la mejor comprensión del método MCDM.La decisión es fundamental en esta vida, a lo que se puede entender que la vida humana es una serie de preguntas y respuestas, y las respuestas vienen de varios factores y siempre vamos a elegir la mejor decisión y    para esto es fundamental que entendamos correctamente lo que es la decisión o la toma de decisiones y lo que ella implica. Como resultado fue que los métodos MCDM están aplicados en todas partes ya sea en la industria, en la ingeniería, en la tecnología, en la medicina, en todos lados ya que siempre tenemos que tener un problema donde debemos aplicar la mejor solución.
Valoración y cualificación de empresas, implementación de normas de calidad ISO
Authors: Vergel Galván Dexy , Peña Mendez Jhorman Adrian , Delgado Sánchez Viviana Paola
Published: April 2021

A continuación, se describe un proceso histórico de la calidad, que implique la valoración y cualificación de empresas a través de implementación de normas de calidad ISO; relatando en una forma rápida y sencilla su origen en el siglo XX, desplazándose por Europa, a través de teorías de mejora en el despeño de las empresas, que relacionan la importancia del costo-beneficio, seguido de Asia (Japón), dando a conocer el milagro japonés establecer control de la industria automotriz aplicando su estrategia de Círculos de Control de Calidad y Total Quality Control.Continuando con un aporte significativo al continente americano como es el “cero defectos” y el TQM (del inglés Total Quality Management). Lo anterior hasta llegar a la ISO 9001 como pionera en normas de calidad, un breve recuento desde su origen a su actualidad, siendo esta en sus inicios una herramienta destinada al enfoque por procesos, así hasta abordar un tema de gran relevancia y auge, como es la aplicación de normas internacionales de información financiera como las (NIIF); y al final una descripción por etapas del proceso de auditoría que permite conocer si las empresas cumplen o no con los estándares de calidad trazados previamente por la organización.
Coalescent times, life history traits and conservation concerns: an example from four shark species from the Indo-Pacific
Authors: Lesturgie Pierre , Planes Serge , Mona Stefano
Published: April 2021

Dispersal abilities play a crucial role in shaping the extent of
population genetic structure, with more mobile species being panmictic
over large geographic ranges and less mobile ones organized in
meta-populations exchanging migrants to different degrees. In turn,
population structure directly influences the coalescent pattern of the
sampled lineages, but the consequences on the estimated variation of the
effective population size (Ne) over time obtained by means of
unstructured demographic models remain poorly understood.
However, this knowledge is crucial for biologically interpreting the
observed Ne trajectory and further devising conservation strategies in
endangered species. Here we investigated the demographic history of four
shark species (Carharhinus melanopterus, Carharhinus limbatus,
Carharhinus amblyrhynchos, Galeocerdo cuvier) with different degrees of
endangered status and life history traits related to dispersal
distributed in the Indo-Pacific and sampled off New Caledonia. We
compared several evolutionary scenarios representing both
structured (meta-population) and unstructured models and
then inferred the Ne variation through time. By performing
extensive coalescent simulations, we provided a general framework
relating the underlying population structure and the observed Ne
dynamics. On this basis, we concluded that the recent decline observed
in three out of the four considered species when assuming
unstructured demographic models can be explained by the presence
of population structure. Furthermore, we also demonstrated the limits of
the inferences based on the sole site frequency spectrum and warn that
statistics based on linkage disequilibrium will be needed to exclude
recent demographic events affecting meta-populations.
Deformation characteristics of a single bubble in immiscible fluids
Authors: Xu Jiarui , Zhang Xiaohui , Qing Shan , Li Ronghua , Wang Hua
Published: April 2021

In order to investigate characteristics of bubble deformation in
immiscible fluids, the bubble shape change during the interface and the
relationship between aspect ratio(E) and dimensionless number of forces
is obtained. A three-dimensional model is established and the
free-floating behavior of a single bubble in immiscible fluids is
numerically simulated by phase-field method. The simulation results are
in good agreement with experimental results. The research shows that, in
the lower liquid, the relationship between E and We, Ta, Re is
distributed between two intersecting lines. In the upper liquid, the
relationship between E and We, Ta, Re is distributed between two
parallel lines. Comparing the bubble deformation and the influence of
the forces. Compared with gravity, the inertial force plays a leading
role in the bubble shape in the lower liquid and upper liquid. Compared
with the viscous force, the surface tension dominates the bubble shape
in the lower liquid.
A new species of Centaurea L. subgen. Cyanus Mill. (Asteraceae) from Turkey
Authors: Şirin Emrah , Yildirim Hasan , Uysal Tuna , Ertuğrul Kuddisi
Published: April 2021

Here we describe Centaurea hekimhanensis, a new species found in Hekimhan
(Turkey, Malatya Province). This Centaurea grows on the stony-gravel
mountain slopes of Yamada? and is morphologically similar to C. reuteriana,
C. bourgaei, and C. pichleri in terms of their flowering lateral stem at the
base of the rosette, but differs regarding the shape of the stem and rosette
leaves, and the size of the rosette leaves and median appendages; the achene
ornamentation is irregularly sulcate. The chromosome number of the new
species is 2n = 20.
A Qualitative Study of Erasmus Program Challenges and Paradoxes Based on the Experiences of Students from Turkey
Authors: Aksay Aksezer Esin , Yağmur Kutlay , van de Vijver Fons
Published: April 2021

Internationalization agenda, especially the Erasmus framework, has become a significant process affecting the Turkish higher education. Erasmus, as being the most influential and preferred mobility scheme, has attracted significant attention and witnessed increasing number of students in years. There are various studies on the outcomes of the Erasmus program in terms of social, cultural, and academic gains of students as well as associated challenges and influence of the Bologna Process on the Turkish higher education outlook. However, there are less visited concepts in terms of challenges that need further attention. This paper addresses these less visited subjects such as project management/implementation issues (diversity, funding, and outcomes), politics of difference, and consumerist approaches. The findings suggest that these issues may complicate program implementations and run the risk of hindering general program targets, leading to a paradoxical outlook such a becoming exclusive to certain group of students, emphasizing difference rather than mutual understanding, seeing the experience as a to-do list item. So, the tension between various issues such as consumerist approaches, politics of difference and project implementation issues and general program targets and outcomes must be acknowledged towards emphasizing the critical role of appropriate student advising and expectation management as well as development of flexible and diverse evaluation-placement methods for efficient and positive program implementation.
Logistics and Supply Chain Management Efficiency Strategy for Ghana’s Mining Industry
Authors: Yaping Qu , Bossman Mary
Published: April 2021

The invaluable contribution of the mining industry in any country’s economy is widely acclaimed and thus not far-fetched. In as much as the mining industry contributes hugely to economic and social growth, its operations are characterized by complex supply chain processes that are relatively capital and cost intensive, and technologically sophisticated to manage. Unfortunately, firms in the mining industry especially for developing countries tend to focus more on procuring modernized equipment and technologies to carry out the complex processes of mining operations to the detriment of applying logistics optimization models.

This research project therefore seeks to analyze the logistics and supply chain operations of mining companies in Ghana, identify the challenges and inefficiencies associated with these operations and their underlying causes, and recommend logistics and supply chain management design, modelling and analysis tools to optimize. With the help of secondary data collected from books, journals, which were further depicted in graphs and tables, the Microsoft Excel Solvers for Vehicle Routing Problem (VRP, Version 3.42), with an embedded Bing Map Key License was used to illustrate and derive optimal solutions for the transportation efficiency of mining firms in Ghana.

The study revealed that the mining industry in Ghana is confronted with supply chain issues like poor road networks in mining communities, variable lead time and exchange rate, strict governmental laws, violent clashes over land royalties, high transport cost due to bad roads, unreliable lead times (caused by port delays), unavailability of local suppliers of international standards, and policy restrictions as the main challenges to supply chain. Clearly, the policy implication emanating from this study is that mining firms in partnership with transport services firms in Ghana must adopt an efficient service delivery and optimal transportation cost reduction strategies, which is designed with the Vehicle Routing Problem Optimization Model in order to benefit mutually in gaining competitive advantage.
Human Resource Management Practices and Workplace Deviant Behaviour of Manufacturing Firms in Rivers State, Nigeria
Authors: Omoankhanlen Joseph Akhigbe , Mutairu Adamu Momodu
Published: April 2021

The nexus between human resource management practices and workplace deviant behaviour in manufacturing companies in Rivers State, Nigeria, was investigated in this study. The sample was conducted in a cross-sectional manner. This study looked at 470 staff from six manufacturing companies. In order to minimize bias in sample case collection, this analysis utilized a simple random sampling method. The primary data was collected using a questionnaire that was provided to each respondent. The spearman rank order correlation coefficient was used to analyze the results. According to the findings, human resources management practices (compensation and employee relations) had a negative significant relationship with both interpersonal and organizational deviant behaviour, with the exception of compensation and interpersonal deviance, which had no significant relationship. It was determined that an efficient human resource management practice in terms of compensation and employee relations is critical in reducing the occurrence of deviant behaviour by manufacturing employees. As a result, the study proposed that manufacturing company management improve workforce relations by caring for workers' well-being and maintaining industrial cohesion, which would further minimize individual and corporate deviant conduct.
Testing the results of the training aimed at future preschool educators by means of the Microsoft Teams program in distance and mixed forms of teaching / learning
Authors: Rudenko Yuliia
Published: April 2021

The article considers the specifics of teaching the discipline "Methods of Acquainting Children with Ukrainian Ethnography in Establishments of Preschool Education" in terms of distant and blended learning. The educational and methodological complex of the course is elaborated in accordance with the syllabi; program learning outcomes; a list of general and profession-related competences that are expected to be formed while studying the discipline; lectures, seminars, practical, laboratory classes; tasks for independent work; individual educational research tasks; evaluation criteria for different types of work for all types of control, etc. At the initial stage of teaching the discipline, a special seminar was held for students – future educators on the topic "Organisation of distance learning using Microsoft Teams software». During a specialised seminar, the future educators were acquainted with: the features of the online content of Microsoft Teams; registration procedure on the platform; obtaining an access password and e-mail address to participate in the work of virtual classes and commands; organisation of the educational process, remote dialogic communication using Microsoft Teams resources; creation of a library of learning materials (lecture notes, video lectures, presentations on the content of lectures, assignments for seminars, practical classes, etc.); possibilities of placing practical materials (tasks for practical classes, independent work, individual educational research tasks, etc.) with the help of OneDrive. The specialised seminar helped to increase the level of digital, information-related, information-digital competence of future educators of preschool educational institutions, which was a prerequisite for success in mastering profession-related disciplines. The article provides instructions for organising practical classes and lectures on the course "Methods of Acquainting Children with Ukrainian Ethnography in Establishments of Preschool Education", prescribes the procedure for testing (current (modular) and final testing). The testing of the programme outcomes using Microsoft Teams and Office 365 software allowed us to optimise the teaching of the course within blended and distance learning.
Distance learning in a pandemic: difficulties and advantages
Authors: Shylina Nataliia
Published: April 2021

The article is devoted to the problem of distance education, namely, education and upbringing under pandemic conditions. The relevance of the use of new computer and information learning technologies has been demonstrated. The connection of information technologies with the “Z” generation has been outlined as the main education idea of the person of the future. The issue of the coronavirus epidemic, which forced the urgent restructuring of all spheres of people’s social life around the world, is addressed in the article. As a result, the problem of the global transition to distance learning under severe quarantine is becoming urgent. The author analyses domestic and foreign pedagogical experience of distance education. Among domestic authors, this problem was studied by O. Kuznetsova, E. Naumenko, O. Onishchenko. Actually, O. Kuznetsova highlights the advantages and disadvantages of distance learning. Foreign researches highlight the technical problems of online education, as well as the problems that lie beyond the purview of technology. These are the problems as follows: student’s ability to communicate and play is limited by the environment within the Internet. These elements are critical to students' ability to develop their emotional and social intelligence. Teachers try to deliver personalised instruction to students in a virtual setting, and the responsibility, instead, falls to parents who may not be up to the task. Many students’ dormitories do not promote learning. The purpose of our study was to analyse the conditions of distance learning according to the following criteria: organisational and methodological support, technical support, psychological difficulties in accordance with the example of Odessa National O. S. Popov Academy of Telecommunications (ONAT). Thus, the availability of normative documents and provision of remote content has been analysed. 80 teachers and 150 students used the survey method and revealed that firstly, which online resources teachers most often use during distance education and secondly, what technical and psychological difficulties the participants of the educational process face. The data were analysed and fixed in the table.
The use of different types of comments in the study of "Linguistic analysis of the literary text" by foreign communicants
Authors: Budnik Anzhela , Bosak Nina
Published: April 2021

The article considers the theoretical foundations for perceiving and understanding a work of art by foreign (non-native) speakers, outlines the types of comments that are actively implemented during the processing of literary texts at philological faculties by foreign communicators within the educational environment. It is proved that when studying the Russian language at the Faculty of Philology of Ushynsky University, foreigners encounter a number of obscure facts that are not related to the boundaries of vocabulary, grammar, phonetics or stylistics, but rather to extralinguistic spheres: social, domestic or historical. Thus, the thesis regarding the inseparability of foreign language learning from acquaintance with the culture of the country the language of which is studied, its history, religion, socio-cultural traditions, features of the national worldview of the native people is generally recognised in linguodidactics. The main purpose of such training is the need to form linguistic competence and ensure communicative competence in the acts of intercultural communication through adequate perception of the interlocutor's language and understanding of original works. It is substantiated that the perception of works of art is achieved by special comments for foreign communicants. These linguistic comments are one of the main means of forming linguistic competence.
Chlamydia trachomatis and Neisseria gonorrhoea Co-Infection Among Patients Attending a Teaching Hospital in Nairobi County: A Retrospective Study
Authors: Mulakoli Festus
Published: April 2021

Background: Chlamydia trachomatis and Neisseria gonorrhoea are microbes that have been associated with urethritis in both male and female genders, which often may lead to complicated conditions such as pelvic inflammatory disease (PID) and infertility globally among others health complications. In Kenya and other developing countries, sexually transmitted infections associated with Chlamydia trachomatis and Neisseria gonorrhoea still pose a challenge in public health.

Methods: A retrospective study was conducted by reviewing laboratory data from Jan 2018 to Dec 2018 to estimate the prevalence of C trachomatis and N gonorrhoea coinfections in patients attending a tertiary institution and its satellite clinics spread across the country. A total of 1228 patient’s data aged 3-69 years was reviewed; with age, gender and Chlamydia trachomatis and Neisseria gonorrhoea status being analyzed.

Results: A total of 1228 patients who visited the hospital in 2018 had their urine samples being tested for Chlamydia trachomatis and Neisseria gonorrhoea by use of a PCR technique. Majority of the patients were males (63.7%). The patients who tested for Chlamydia trachomatis and Neisseria gonorrhoea had an average age of 34 years (range: 3–69 years). Of those 1.4% tested positive for both Chlamydia trachomatis and Neisseria gonorrhoea infections, and males were more infected than females (1.1% vs 0.3).

From the information gathered during the study period, the proportion of patients with Chlamydia trachomatis infection was (16.1 %) (95 % CI 9.5, 17.9), and with N. gonorrhoea infection was 5.4%. Coinfection was highest among sexually active group that is those aged between 21 years to 40 years.

Conclusion: The prevalence of C. trachomatis is significantly high among male patients. We recommend the implement a molecular screening for Chlamydia trachomatis and Neisseria gonorrhoea to identifying asymptomatic female cases. This study further provides evidence on the importance of contact tracing in the management of Chlamydia trachomatis and other STIs. There is an urgent need for studies designed to investigate the prevalence and risk factors of Chlamydia trachomatis and Neisseria gonorrhoea among female patients who are majorly asymptomatic in Kenya.
Prophylactic Effects of ARTAVOL® on Plasmodium berghei Infected Mice
Authors: Amanya Martin , O. Ajayi Clement , Natukunda Bernard , G.Agaba Amon
Published: April 2021

Introduction: Despite the efforts of governments and health organisations to eradicate malaria, it is still endemic in sub-Saharan Africa and this could be due to cost of antimalarial drugs, resistance to these drugs and climate change among others. Traditional medicine practitioners and scientists have started developing antimalarial drugs from medicinal plants among which is ARTAVOL®. ARTAVOL® is a herbal product that is used to prevent malaria in some communities in Uganda, however, its prophylactic effects on Plasmodium berghei infected mice has not been established yet.

Methods: The infusion of ARTAVOL® powder was prepared, cooled, filtered, concentrated in vacuo at 55 0C and freeze-dried. The freeze-dried extract was reconstituted with distilled water for antimalarial using prophylactic model mice. Thirty-six mice were randomised into 6 groups of 6 mice each. Groups I to III mice were orally administered with the extract at 15 to 60 mg/kg/day while group IV received Pyrimethamine (1.25 mg/kg) while groups V and VI (uninfected) received 0.2 mL distilled water for seven days before the inoculation of Plasmodium berghei ANKA parasites on day 7 (D7). The parasitaemia levels were examined after 72 hours using standard procedure and blood collected through cardiac puncture for haematological study.

Results: The Lethal Dose (LD50) of the crude ARTAVOL extract was greater than 5000 mg/kg. Also, there was calmness and paw licking immediately after dosing which stopped after few minutes. Significant reduction in parasitaemia level was observed in all test doses when compared with negative control. At 30 mg/kg, the extract gave 62.9% suppression, which was not significantly different from that of 60 mg/kg (68.7%) on day 3. On day 5, the extract gave 62.3% and 66.4% Suppressions At 30 And 60 Mg/Kg That Were Not Significantly Different From Each Other. A Dose Dependent Reversal of Hematocrit (HCT) reduction was observed at the 3 dose levels but their parameters did not show any significant difference when compared to the normal group but significant when compared with negative control.

Conclusion: ARTAVOL® extract has shown a dose dependent reducing effect on the level of parasitaemia in P.berghei infected mice; it is acutely safe and has ability to increase RBC counts.