bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of organic solvents in morphology and mechanical properties of electrospun polyvinylpyrrolidone fibers
Authors: Villacís Núñez Carla Nathaly , Narváez Diego , Narváez Christian , Vizuete Karla , Arroyo Carlos
Published: June 2018

In this work, the electrospinning technique was used to obtain fibers for mechanical characterization. polyvinylpyrrolidone (PVP) was combined with organic solvents (ethanol and dimethylformamide (DMF)) to generate solutions, looking for the appropriate parameters to obtain fibers with the best morphology and the best mechanical properties. Starting from previous investigations to find the adequate percentages of solvent and PVP, several solutions were made, varying the different parameters like voltage, flow, tip collector distance. Seeking to obtain acceptable samples, the diameter was measured in a scanning electron microscope (SEM). The elastic modulus was measured for the fibers with the best aspect. Mechanical properties were measured in an atomic force microscope (AFM) with the Hertz contact method and the data were approximated to its mathematical model. The solutions that resulted in the best morphological properties were: ethanol - 8% PVP, DMF – 14% PVP, 70% ethanol - 30% DMF - 8% PVP, with diameters in the micrometer range of 1.6, 1.22 and 1.35 respectively, and elastic modulus of 40.08 MPa, 8.8 MPa and 32.78 MPa correspondingly. An analysis of all the parameters influencing the process was performed and an analysis of the influence of the solvents, based on the data of the elastic moduli was carried out.
Análisis de desgaste para el fresado de muestras de aluminio AA 7075-T6
Authors: Cortez Pazmiño Byron Hernán , Coque Augusto
Published: June 2018

La presente investigación describe la influencia de los parámetros de mecanizado en el desgaste de las herramientas y la calidad superficial. Los factores que se consideran para este análisis son: velocidad de corte (Vc), Avance por diente (fz), Profundidad de corte (ap) y la Trayectoria de la herramienta (T), para lo cual, en un centro de mecanizado EMCO Concept Mill 260 y en una muestra de Aluminio A7075-T6 se realizó una operación de fresado plano. Para el modelo experimental se utilizó el método estadístico Taguchi con un arreglo ortogonal L27. Estableciendo parámetros de mecanizado que ayuden a obtener desgastes mínimos en las herramientas sin influir en los acabados superficiales de las muestras manufacturadas. Acorde a esta investigación el factor (fz) es estadísticamente significante para la rugosidad superficial y los factores (fz) y (ap) para el desgaste por filo de aportación, estos modelos dan como resultado una rugosidad superficial 0.061 µm y una cantidad de 0,004 mm3 de aluminio adheridos a la herramienta. Después de utilizar los parámetros de mecanizado óptimos se obtuvo una mejora de 4,9% para la rugosidad y una reducción del 7,5% en el desgaste por filo de aportación.
Diseño y Construcción de una plataforma de robot móvil teleoperada a bajo costo para interiores
Authors: Gaona Andrés , Loza David , Cortez Pazmiño Byron Hernán , Segura Sangucho Luis Javier
Published: June 2018

Este trabajo presenta el diseño y construcción de una plataforma robótica móvil de bajo costo. El robot ha sido desarrollado en base a tres sistemas: mecánico, sensorial y de control. El sistema mecánico describe la implementación de los mecanismos de tracción y translación. El sistema sensorial muestra los sensores implementados para realizar odometría y navegación reactiva. El sistema de control explica los componentes del algoritmo de control utilizado para la manipulación del robot móvil. Se utilizó el Sistema Operativo para Robots (ROS) como base del diseño del autómata. La plataforma robótica ha sido probada bajo diferentes circunstancias obteniendo resultados prometedores de frente a nuevos estudios.
Diseño estadístico para evaluar el efecto inhibidor del CO2 sobre la tasa de respiración de frutas y hortalizas
Authors: De la Vega Quintero Juan Carlos , Angós Iturgaiz Ignacio , Rodriguez Balza Mairett , Machado Wilfre
Published: June 2018

Se desarrolló la ruta metodológica para estudios que evalúan el efecto inhibidor del CO2 sobre la tasa de respiración de frutas y hortalizas. Para ello se empleó el diagrama de flujo de la ANSI, describiendo detalladamente cada paso, estableciendo una guía específica para los investigadores interesados en realizar estudios en esta área de investigación con un diseño estadístico claro, confiable y preciso.
Producción de ácidos orgánicos y alginato de sodio a partir de tratamientos hidrotermales empleando agua de mar
Authors: Gordòn Salgado Jonatan Israel , Vyhmeister Eduardo , Rodríguez Román
Published: June 2018

Se pretende añadir valor agregado a las algas pardas (Pheophyta/Padina) ecuatorianas empleándolas como recursos para la producción de ácidos orgánicos y alginato de sodio de manera que se evidencie una fuente alternativa de materia prima en la petroquímica. Basado en el trabajo de Mazumder se determinaron las condiciones para la extracción alginato de sodio empleando agua de mar y concentración de catalizador (Na2CO3) al 0% ,1.5% y 3%; el valor del mejor rendimiento fue de 27,34%. Así como también para la obtención de ácidos orgánicos (ácido láctico y acético) basado en el trabajo de Jeon, se empleó metodología de superficie de respuesta (MSR); para lo cual se empleó agua de mar para dos rutas: con alginato de sodio procedente de Sigma Aldrich y con algas pardas ecuatorianas pre-tratadas. El diseño experimental de Box Behken tiene como factores a la temperatura, tiempo de digestión, salinidad del agua y cantidad de catalizador (CaO). El mayor rendimiento obtenido en el estudio para ácido láctico y acético fue del 30,54% y 5,872% respectivamente. Los productos extraídos se analizaron mediante: Espectroscopia infrarroja con transformada de Fourier (IFTR-ATR), Análisis Termogravimétrico (TGA) y el Escaneo Calorimétrico Diferencial (DSC), para el alginato de sodio; así como para los ácidos orgánicos, Espectrofotometría de Movilidad Iónica (GC-IMS).
Relación de temperatura, pH y CE en la variación de concentración de fosfatos en el Río Grande, Cantón Chone
Authors: Carrera Villacrés David , Guerrón Varela Edgar , Cajas Morales Leidy , González Farinango Tania , Guamán Pineda Érika , Velarde Salazar Paul Adrián
Published: June 2018

La eutrofización representa un gran problema debido al incremento de fósforo que degrada la calidad del agua. En el Cantón Chone, Ecuador, se construyó la Presa del Proyecto Multipropósito Chone (PPMC), cuyo embalse se encuentra cubierto de plantas acuáticas, por exceso de nutrientes. Por consiguiente, se analizó la influencia de la temperatura, pH y conductividad eléctrica (CE) sobre las concentraciones de fosfatos para entender su relación y cómo puede afectar en la eutrofización. Se definió 26 puntos de muestreo (época seca y de lluvia); los parámetros se midieron en el Laboratorio de Ambiente de la Universidad de la Fuerzas Armadas – ESPE. Con los datos obtenidos, se realizó un análisis estadístico con el software “R” para evaluar las relaciones entre las variables, mediante correlación, dispersión y regresión. Se determinó que el pH no refleja relación con la variación de concentración de los fosfatos; la posible influencia de la temperatura en época seca se debe probablemente a la reducción del caudal del Río Grande ya que incrementa la concentración de fosfatos; la CE posiblemente influye, pues las concentraciones de los iones disueltos afectan los equilibrios químicos de las especies de fósforo. Así, la temperatura y CE tienen una posible influencia sobre la variación de concentración de fosfatos, afectada por las temporadas climáticas y posiblemente por las formaciones geológicas; éste conjunto de interacciones afecta la disponibilidad del fósforo en el agua, y en consecuencia influye en la eutrofización.
Desinfección bacteriana de aguas residuales utilizando cavitación hidrodinámica a través de un tubo Venturi
Authors: Lafuente Flores Esteban Fernando , López Cevallos Héctor André
Published: June 2018

Este estudio muestra un proceso de desinfección bacteriana de las aguas contaminadas del Río Santa Clara utilizando un método de cavitación hidrodinámica. Se utilizó un circuito de prueba cerrado con posibilidad de controlar la velocidad de flujo y la presión estática. El comportamiento de la cavitación ha sido capturado por un sensor de temperatura, tres sensores de presión y una cámara de alta velocidad. El resultado del experimento muestra que la cavitación hidrodinámica es un método físico, energéticamente eficiente y, por lo tanto, puede considerarse como una técnica potencial para un esquema de tratamiento de agua a gran escala. Así como, que luego de tratar el agua durante el mismo tiempo a distintas presiones de descarga se evidencia que cuando la presión de descarga aumenta, el grado de eficiencia de desinfección también aumenta.
Capacidad de carga estática de una viga armada tipo I con soldadura intermitente en la unión alma patín
Authors: Naranjo-Guatemala Carlos Rodrigo , Nicolalde Espinosa Xavier , Alcívar Vaca María
Published: June 2018

Para optimizar el uso tanto de materiales como de mano de obra empleados en la fabricación de vigas secundarias, se estudia si la variación de porcentaje de soldadura en la unión alma-patín altera la capacidad de carga de la viga. Se diseñaron tres vigas de igual geometría, pero con la variación de que la conexión viga patín tenían un porcentaje de soldadura del 70%, 57% y 37%. Las vigas cumplieron los criterios establecidos en los códigos NEC-SE-AC y AWS D1.1. Las vigas diseñadas fueron simuladas en un software CAE, las vigas construidas se sometieron a un ensayo a flexión bajo las mismas condiciones de carga y apoyos. El valor del esfuerzo normal, esfuerzo cortante y las deflexiones experimentales se compararon con los obtenidos en el modelo computacional y los que establece la formulación teórica. Adicional a esto se efectúo un análisis del costo comparativo de la fabricación de vigas con soldadura intermitente y continua, tomando como parámetros de variación los consumibles de soldadura y la mano de obra.
Estrategia de mecanizado óptima en operaciones de fresado 3D en superficies inclinadas, con alta velocidad de corte (HSM) en el aluminio 7075 T6
Authors: Vaca Xavier , Culqui Borys Hernan
Published: June 2018

En el presente proyecto de investigación, se ha seleccionado cuatro tipos de estrategias de fresado 3D de acabado para el mecanizado en superficies inclinadas, el material de trabajo es aleación de aluminio 7075 T6 y se analizó la calidad superficial a través de la medición de la rugosidad. En los ensayos se varía la velocidad de corte y se mantiene constante los parámetros de corte como velocidad de avance, profundidad de corte, paso y velocidad del husillo conforme al recomendado por el fabricante de la fresa punta redonda. La velocidad de corte varía a lo largo del filo de la herramienta esférica. Se realizó un diseño CAD con ocho pendientes, de 35º a 87,5º en intervalos de 7,5º. Se utilizó una metodología experimental, donde se combinó todas las variables, por lo tanto las ocho superficies fueron mecanizadas en seco y evaluadas por cada estrategia. Se realizó un análisis de resultados y se encontró que la estrategia que presenta menor rugosidad superficial es la de paralelo con trayectoria en descenso (PD), con un rango de velocidad de corte efectiva de 260 a 422 m/min y se obtuvo una rugosidad Ra promedio de 0,295 µm.
Electrospinning de fibras submicrométricas de Fibroína de seda con Sangre de drago (Croton Lechleri Müll) para la producción de apósitos
Authors: Melo Gabriel , Villacís Núñez Carla Nathaly , Vizuete Karla , Arroyo Carlos , Narváez Christian
Published: June 2018

El presente trabajo de investigación hace uso de la técnica de electrospinning. Los biomateriales utilizados fueron fibroína de seda que resalta entre otros biopolímeros por sus excelentes propiedades mecánicas y biológicas dopado con sangre de drago, savia natural con muchas bondades curativas utilizadas ancestralmente por pueblos indígenas de la Amazonía. Tras la extracción del biopolímero y la preparación de la solución acuosa usando óxido de polietileno (PEO) de 1000 [KDa]. Las muestras fueron caracterizadas de las siguientes formas: morfológicamente a través de microscopía SEM (microscopio electrónico de barrido) obteniendo diámetros entre 139,43 - 160 [nm] y mecánicamente en microscopía de fuerza atómica (AFM) obteniendo módulos de Young de 279,9[MPa] sin sangre de drago y 107,1 [MPa] con sangre de drago.
Métodos de agrupamiento LA & SIA: Comparación computacional
Authors: Naranjo Mauricio , Pazmiño Maji Ruben , Conde Miguel , Peñalvo Francisco
Published: June 2018

Las analíticas de aprendizaje son y siguen siendo una tecnología emergente según el informe Horizon del 2016, es por ello por lo que el estudio y la búsqueda de nuevas técnicas de análisis es importante. El análisis Estadístico Implicativo permite descubrir R-reglas de la forma a → b sobre un conjunto de variables o sujetos. Las reglas se representan gráficamente por dendogramas que sirven como una nueva herramienta clustering basada en el concepto de cohesión. El Clustering es una de las técnicas más utilizadas en Learning Analytics para la exploración de datos para condensarlos en grupos heterogéneos de objetos similares entre sí. El objetivo de este artículo es comparar desde la ocupación de memoria las funciones cluster utilizadas en Learning Analytics hclust.vector, dendro.variables y diana y las funciones callHierarchyTree y callSimilarityTree utilizadas en el Análisis Estadístico Implicativo, esto permitirá determinar las ventajas de las nuevas técnicas de análisis cluster basadas en el Análisis Estadístico Implicativo. El análisis comparativo se realizó mediante un diseño cuasi experimental bifactorial del tipo RGXO, para controlar las variables exógenas se utilizó similares arquitecturas de hardware (Procesador Core I7, Velocidad 2,2 Ghz y Memoria RAM 8Gb) y de software (Windows 8, Ubuntu 16.04, MacOS Sierra 10.12, R v3.4.1 y RStudio v1.0.153). El colectivo de estudio estuvo conformado por 100000 bases de datos de 1000 observaciones y 100 variables dicotómicas. Se utilizó un método de muestreo aleatorio simple, el tamaño de muestra utilizado fue de 383 bases de datos. Los resultados demuestran que no existe diferencia significativa en la ocupación de memoria entre los métodos simlrty, dendro_diana y hclust_vector, es decir estadísticamente los tres métodos son equivalentes y son los que menos memoria ocupan. El método hrarchy ocupa el segundo lugar en mayor ocupación de memoria y el método que más memoria utiliza es dendro_variables.
Filosofía Lean y Gerencia de Operaciones: El caso de las empresas de Ambato, Ecuador
Authors: Ortega Freire Yanet Marisol , Vaca Sergio
Published: June 2018

El propósito de este estudio es brindar, desde la perspectiva de la filosofía Lean, una visión panorámica del manejo de los procesos en las empresas del Cantón Ambato, Ecuador, a través de la cual se determinan los aspectos claves de este sistema de trabajo con énfasis en los procedimientos para la eliminación de desperdicios que no aportan valor. La metodología  se basa en un estudio macro del sector industrial y comercial, llevado a cabo en el 2016. La recopilación de información se realiza mediante un estudio de campo con entrevistas estructuradas, dirigidas a los administradores de las empresas. Los resultados obtenidos reflejan la cultura en el campo de la optimización de recursos, así como también demuestran el nivel de conocimientos del modelo especialmente en términos de desperdicios, sobreproducción, distribución del espacio y mejora continua. En las conclusiones se deduce que las entidades de la zona tienen implementados mecanismos de mejora continua en los procesos,  aunque ciertas prácticas para cumplir con los propósitos Lean requieren ser perfeccionadas.
Aplicación de la química verde para la obtención de bases lubricantes
Authors: Rodríguez Roman , Luna David , Alvarez Chacón Jonathan André
Published: June 2018

El presente estudio busca obtener una base lubricante mediante la El presente estudio busca obtener una base lubricante mediante la reacción de esterificación de Fischer entre ácidos grasos provenientes de los aceites vegetales con aceite de fusel, empleando como catalizador el ácido sulfúrico y como desecante sílica gel con un tiempo de reacción de 2 horas. Se estableció un diseño experimental óptimo a partir de estudios previos, donde se determinaron las propiedades físico-químicas más relevantes, además se realizaron pruebas de tendencia a la corrosión y demostraron que no alteran la superficie del metal ni su color. El aceite de fusel fue tratado y deshidratado para obtener alcoholes para la reacción de esterificación. Las nueve bases lubricantes se caracterizaron mediante propiedades físico–químicas como densidad, viscosidad cinemática, índice de viscosidad, punto de escurrimiento y punto de inflamación; además se determinó la composición relativa en forma cualitativa y cuantitativa mediante la técnica de cromatografía de gases con espectrómetro de masas (GC/MS), mediante esta técnica se identificó un total de 7 ésteres de ácidos grasos con los alcoholes del aceite de fusel. Se aplicaron 3 principios de la química verde como la utilización de materias primas renovables, síntesis químicas menos riesgosas para el ser humano y la disminución del consumo energético.
Análisis de la reproducibilidad y repetitividad en ensayos reológicos I suspensiones de óxido de silicio y etilenglicol
Authors: Villacís Núñez Carla Nathaly , Naranjo Herrera Luis Fernando , Delgado García Reinaldo , Rubio Hernández Francisco , Páez Flor Nicolás , Melo Gabriel
Published: June 2018

El presente estudio tiene como principal objetivo encontrar un protocolo adecuado para la experimentación repetible y reproducible de ensayos reológicos de suspensiones con nanopartículas. Se consideraron mezclas con diferentes concentraciones de óxido de silicio y etilenglicol para el análisis. Se experimentó inicialmente con control de velocidad en una geometría cono – plato, para posteriormente cambiar a control de esfuerzo en una geometría de vanos. Se observó el comportamiento reológico con saltos de escalón en búsqueda de reproducibilidad. También se comparó los resultados obtenidos con y sin aplicación de baño ultrasónico para homogeneización de la suspensión. Finalmente, se compararon las gráficas construidas y se definieron los parámetros adecuados para garantizar reproducibilidad en este tipo de suspensiones.
Implementación del caster experimental para la distribución de medidas de GPS en tiempo real a través de NTRIP
Authors: Zabala Monica
Published: June 2018

El sistema de posicionamiento GPS exige precisión en cada una de las medidas, sin embargo por diversos factores durante la transmisión la señal sufre distorsión provocando imprecisión en la solución final. Los procedimientos observacionales GNSS se clasifican de acuerdo a la naturaleza de la medición absoluta y relativa. Técnicas de diferenciación de medidas de GPS incluye post-proceso y corrección en tiempo real a través del protocolo NTRIP, para ello se implementa y configura los elementos necesarios de la arquitectura siendo el elemento fundamental el caster responsable de difundir las correcciones de la estación de referencia configurado en formato RTCM 2.3 hacia los dispositivos móviles Mobile Mapper 100 compatibles con NTRIP y Mobile Mapper 10 y 20 que no soportan NTRIP se da solución al problema utilizando al teléfono móvil como gateway. Los resultados muestran una reducción de error en E, N, U mejorando la precisión en la solución final. El impacto de la implementación del caster se replica para instituciones gubernamentales responsables de la georreferenciación a nivel nacional, así como se mantiene el caster experimental en la ESPOCH para fines investigativos con ello se pretende incluir al país dentro de la infraestructura de posicionamiento en tiempo real de América Latina administrado por SIRGAS.
The Effect of Machining on Surface Integrity of AISI 1018
Authors: Diaz Carlos , Vila Pastor Carlos , Ayabaca César , Calle Orlando
Published: June 2018

The present work studies the effects of the feed rate and depth cut in the surface roughness, microhardness, microstructure and mechanical properties of AISI 1018 steel. The scientific method is applied to an experimental methodology that allows the quantification of results through chemical composition tests, CAD processes / CAE / CAM, metallographic analysis and hardness measurements. The results obtained contrast the trend and influence of the study parameters, raise causes and favorable or unfavorable effects on the surface of machined steel within a sustainable manufacturing process.
The social and economic factors of environmental behavior in the region LAW
Authors:   Kuban State Technological University, Pupkova Yulia Valentinovna
Published: June 2018

The research examines the factors affecting the per-ception of environmental risks related to air pollu-tion in Krasnodar Territory. The study analyzes the official statistics on air pollutant emissions. The author presents the results of a sociological survey of Krasnodar citizens on environmental behavior patterns having been updated due to the massive loss of trees in the city because of ice pellets in 2014. The research substantiates that there can be a slight increase in the population’s demand for envi-ronmental quality as a result of natural disasters not posing a massive threat to people’s lives. However, the living standards of people in Krasnodar Territory are far from the tipping point of the Environmental Kuznets Curve which demonstrates that the society is ready to impose heavy demands on the environ-mental situation in the region.
Concerning the civil liability of parents of juvenile delinquents
Authors:   Bauman Moscow State Technical University, Tikhanova Natalya Evgenyevna
Published: June 2018

The author presents a legal study on bringing par-ents to material liability for harm caused by their children. The relevant legislative provisions are ana-lyzed. It is concluded that the civil liability of parents for their illegal behavior (improper upbringing and (or) supervision of minors) is of the individual na-ture. As the elements of a civil offense are not clearly consolidated, each element that is necessary to bring to civil liability is revealed and described based on research and casual judicial interpretation. The focus is on the delineation of material liability of parents and organizations empowered to supervise juvenile delinquents. Ambiguities in the key aspects of parental responsibility and, as a consequence, heterogeneous case law demonstrate a lack of quali-ty of the law statement.
The state policy on the rural youth of Arctic Yakutia in the 1970s–1980s
Authors:   Institute for Humanities Research  and Indigenous Studies of the North,  Siberian Branch of the Russian Academy of Scienc-es, Egorov Pyotr Mikhaylovich
Published: June 2018

The study examined the Soviet state policy on the rural youth of Arctic Yakutia in the 1970s–1980s. There were no stand-alone laws on the state youth policy in the USSR. Laws and regulations on youth issues were a part of the general legislation. All leg-islative initiatives to regulate the youth policy came from the Communist Party of the Soviet Union, in some cases from the All-Union Leninist Young Communist League (the Komsomol). In the 1970s–1980s, the state youth policy was based on the communist ideology. The Komsomol was the pro-moter of such a policy. At the same time, the em-phasis was placed on the ideological communist upbringing of the younger generation. The involve-ment of a large number of young personnel in the agricultural industry led to the upturn in the Yakut agrarian sector in the period under consideration. The rural youth could use agricultural machinery more effectively; the mechanized labor prevailed over the manual one. In this regard, the government set itself the goals to improve youth upbringing and promote the unity of ideological and political, labor and moral education of young people in the light of the specific development of a modern village.
Developing IHL students autonomy in Russia in VOLL
Authors:   Moscow State University of Psychology and Education, Litvinov Aleksandr Viktorovich , Chernova Oksana Evgenyevna ,   Peoples’ Friendship University of Russia
Published: June 2018

The research discusses the development of students autonomy in the Institutes of Higher Learning (IHLs) in Russia in vocationally-oriented language learning (VOLL). The authors analyze the works of Russian and western scientists in this field, reveal similarities and differences in their views, and provide their definition of learner autonomy. Based on the ways to develop learner autonomy, the authors distinguish motivational, personal, and competence-based components in the structure of students autonomy. To develop the autonomous skills of would-be interpreters of vocationally-oriented texts, the authors propose to use Moodle e-learning platform and specify the educational environment of its effective application to achieve the objective. The authors conducted a series of experiments that proved the efficiency of the methods suggested.
The development model of future teachers’ readiness to implement interdisciplinary integration as a way to develop universal educational actions in primary school students
Authors:   North Ossetian State Institute of Education, Rumyantseva Nadezhda Vladimirovna
Published: June 2018

The research discusses the problem of future teachers’ vocational training in the universities of education according to the requirements of the Federal State Educational Standard of Higher Education. A theoretical analysis involves the readiness of primary school teachers to implement the interdisciplinary integration as a basic way to develop universal educational actions in primary school students. The latter are the key competence of the Federal State Educational Standard of Primary General Education. The development model of students’ readiness for implementation of the interdisciplinary integration as a way to develop universal educational actions in primary school students is described in the context of system-, activity- and competency-based as well as person-centered approaches to training future primary school teachers. The target, content-related, procedural, and reflexive evaluative units of such a model are revealed. This model presents the teaching arrangements of effective vocational training of teachers-to-be in the universities of education and proposes the ways to assess the level of students’ readiness for developing the universal educational actions in primary school students on a metasubject basis.
Thematic Trends in Complementary and Alternative Medicine Applied in Cancer-Related Symptoms
Authors: Moral-Munoz Jose A. , Arroyo-Morales Manuel , Piper Barbara F. , Cuesta-Vargas Antonio I. , Díaz-Rodríguez Lourdes , Cho William C.S. , Herrera-Viedma Enrique , Cobo Manuel J.
Published: June 2018

Purpose

The main goal of this study is to discover the scientific evolution of Cancer-Related Symptoms in Complementary and Alternative Medicine research area, analyzing the articles indexed in the Web of Science database from 1980 to 2013.

Design/Methodology/Approach

A co-word science mapping analysis is performed under a longitudinal framework (1980 to 2013). The documental corpus is divided into two subperiods, 1980–2008 and 2009–2013. Thus, the performance and impact rates, and conceptual evolution of the research field are shown.

Findings

According to the results, the co-word analysis allows us to identify 12 main thematic areas in this emerging research field: anxiety, survivors and palliative care, meditation, treatment, symptoms and cancer types, postmenopause, cancer pain, low back pain, herbal medicine, children, depression and insomnia, inflammation mediators, and lymphedema. The different research lines are identified according to the main thematic areas, centered fundamentally on anxiety and suffering prevention. The scientific community can use this information to identify where the interest is focused and make decisions in different ways.

Research limitation

Several limitations can be addressed: 1) some of the Complementary and Alternative Medicine therapies may not have been included; 2) only the documents indexed in Web of Science are analyzed; and 3) the thematic areas detected could change if another dataset was considered.

Practical implications

The results obtained in the present study could be considered as an evidence-based framework in which future studies could be built.

Originality/value

Currently, there are no studies that show the thematic evolution of this research area.
CitationAS: A Tool of Automatic Survey Generation Based on Citation Content
Authors: Wang Jie , Zhang Chengzhi , Zhang Mengying , Deng Sanhong
Published: June 2018

Purpose

This study aims to build an automatic survey generation tool, named CitationAS, based on citation content as represented by the set of citing sentences in the original articles.

Design/methodology/approach

Firstly, we apply LDA to analyse topic distribution of citation content. Secondly, in CitationAS, we use bisecting K-means, Lingo and STC to cluster retrieved citation content. Then Word2Vec, WordNet and combination of them are applied to generate cluster labels. Next, we employ TF-IDF, MMR, as well as considering sentence location information, to extract important sentences, which are used to generate surveys. Finally, we adopt manual evaluation for the generated surveys.

Findings

In experiments, we choose 20 high-frequency phrases as search terms. Results show that Lingo-Word2Vec, STC-WordNet and bisecting K-means-Word2Vec have better clustering effects. In 5 points evaluation system, survey quality scores obtained by designing methods are close to 3, indicating surveys are within acceptable limits. When considering sentence location information, survey quality will be improved. Combination of Lingo, Word2Vec, TF-IDF or MMR can acquire higher survey quality.

Research limitations

The manual evaluation method may have a certain subjectivity. We use a simple linear function to combine Word2Vec and WordNet that may not bring out their strengths. The generated surveys may not contain some newly created knowledge of some articles which may concentrate on sentences with no citing.

Practical implications

CitationAS tool can automatically generate a comprehensive, detailed and accurate survey according to user’s search terms. It can also help researchers learn about research status in a certain field.

Originality/value

CitaitonAS tool is of practicability. It merges cluster labels from semantic level to improve clustering results. The tool also considers sentence location information when calculating sentence score by TF-IDF and MMR.
A Study of Methods to Identify Industry-University-Research Institution Cooperation Partners based on Innovation Chain Theory
Authors: Xu Haiyun , Wang Chao , Dong Kun , Luo Rui , Yue Zenghui , Pang Hongshen
Published: June 2018

Purpose

This study aims at identifying potential industry-university-research collaboration (IURC) partners effectively and analyzes the conditions and dynamics in the IURC process based on innovation chain theory.

Design/methodology/approach

The method utilizes multisource data, combining bibliometric and econometrics analyses to capture the core network of the existing collaboration networks and institution competitiveness in the innovation chain. Furthermore, a new identification method is constructed that takes into account the law of scientific research cooperation and economic factors.

Findings

Empirical analysis of the genetic engineering vaccine field shows that through the distribution characteristics of creative technologies from different institutions, the analysis based on the innovation chain can identify the more complementary capacities among organizations.

Research limitations

In this study, the overall approach is shaped by the theoretical concept of an innovation chain, a linear innovation model with specific types or stages of innovation activities in each phase of the chain, and may, thus, overlook important feedback mechanisms in the innovation process.

Practical implications

Industry-university-research institution collaborations are extremely important in promoting the dissemination of innovative knowledge, enhancing the quality of innovation products, and facilitating the transformation of scientific achievements.

Originality/value

Compared to previous studies, this study emulates the real conditions of IURC. Thus, the rule of technological innovation can be better revealed, the potential partners of IURC can be identified more readily, and the conclusion has more value.
Is Participating in MOOC Forums Important for Students? A Data-driven Study from the Perspective of the Supernetwork
Authors: He Chaocheng , Ma Panhao , Zhou Lusha , Wu Jiang
Published: June 2018

Purpose

Compared with traditional course materials used in the classroom, the massive open online course (MOOC) forum that delivers unlimited learning content to students has various advantages. Yet MOOC has also received criticism recently, notably the problem of extremely low participation rates in its discussion forums. This study aims to explore the correlation between forum activity and student course grade in MOOC, and identify more accurately the forum activity levels of participants and the quality of threads in MOOC.

Design/Methodology/Approach

We crawled students’ tests, final exams, exercises, discussions performance data and total scores from a course in Chinese College MOOC from May 2014 to August 2014. And we use the data to analyze the correlation between Forum Participation and Course Performance based on nonparametric tests as well as multiple linear regressions with the software of R. The study provides definitions and algorithms of super degrees based on the supernetwork model to help find high-quality threads and active participants.

Findings

A positive correlation between forum activity and course grade is found in this study. Students who participate in the forum have better performance than those who do not. Using the definitions and algorithms of super degrees in the supernetwork, forum activity levels of participants as well as the quality of threads they employ are identified.

Research limitation

Only limited representative forum participants and threads are used to analyze the activity level and significance of the MOOC forum. Also, the study only investigates one Chinese course on information retrieval. More data and more data sources could be helpful in better understanding the MOOC forum phenomenon.

Practical implications

As super degrees can reveal more latent information and recognize high-quality threads as well as active participants, these parameters can be used to assess needs to improve forum settings and alleviate the problem of low forum participation. The proposed super degrees can be applied in social network domains for further research.

Originality/Value

Definitions and algorithms of super degrees are provided and used for forum analysis. Super degrees can be applied to find high-quality threads and active participants, which is beneficial to guide students to participate in these high-quality threads and have a better understanding of knowledge MOOC provides.
The Effects of B2C Interaction on Customer Loyalty
Authors: Yang Xinyue , Yuan Qinjian
Published: June 2018

Purpose

This research attempts to examine the relationship between B2C interaction and customer loyalty in Business-to-Customer (B2C) context from a new perspective of the interactive tool.

Design/methodology/approach

The scale for B2C interactive tools is of seven dimensions: efficiency, security, fulfillment, mobility, community, cultivation, and customization. A model reflecting the influences of these attributes on customer loyalty is developed and empirically examined based on data collected from 265 B2C customers.

Findings

Results reveal that the fulfillment, mobility, community, and customization of B2C interactive tools can enhance customer loyalty directly and significantly. Efficiency and security, serving as the premise for possible purchase behavior, facilitate fulfillment. In addition, cultivation promotes the formation of customization, which directly strengthens customer loyalty.

Research limitations

Models considering individual-level indicators and combined with classic loyalty mechanisms in B2C context may lead to a deeper understanding of the tested effects of interaction on customer loyalty.

Practical implications

To strengthen B2C interaction and further cultivate loyal customers, making interactive tools more fundamental, flexible, and personalized is critical for B2C enterprises.

Originality/value

This study proposes a new perspective from interactive tools when measuring the relationship between B2C interaction and customer loyalty, and offers a useful theoretical lens and reasonable explanations for investigating customer loyalty in B2C e-commerce context.
Potential for imitation as a dynamic capability of organisation
Authors: Krzakiewicz Kazimierz , Cyfert Szymon
Published: June 2018

Potential for imitation as a dynamic capability of organisation Until recently, what was treated as unique resources in strategic management were financial, human and other resources, and their uniqueness was examined mostly in quantitative terms. However, globalisation of economic processes has meant that a degree to which resources are unique determine their quality, as a result of which they cannot be evaluated solely in quantitative terms. Such unique resources include competencies, dynamic capabilities and other intellectual resources within organisations, including their potential for innovation and imitation. The purpose of this article is to discuss the construct of potential for imitation considered in terms of the dynamic capability of organisation. The starting point in the study was to outline the essence of the dynamic capabilities of the organization, then the potential of imitation in the dynamic capacity system was embedded in order to finally refer to the link between innovation and imitation.
Shaping of the intramunicipal relations in the contemporary local government on the city of Poznan example
Authors: Bartkowiak Piotr , Krzakiewicz Marianna
Published: June 2018

Shaping of the intra-municipal relations in the contemporary local government on the city of Poznan example The main objective of this article is to evaluate the significance of forming the intra-municipal relations in relation to place marketing, based on the example of the Polish city of Poznan. Different conceptions of place marketing, and intra-municipal relations are defined, their mutual correlation aimed towards increasing a city’s value is explained, and intra-municipal relations are illustrated. Poznan was chosen due to the preparatory cooperation which took place between the city, and its citizens. It is explained how Poznan’s authorities incorporate practices of shaping the intra-municipal relations as a place marketing practice, for facing the city’s important challenges such as: ageing of the society, ecological issues, the need for public participation, as well as the importance of maintaining a high quality of life for its citizens. The conclusion is drawn, that such marketing efforts for dealing with these issues do in fact have the joint goal of increasing the quality of life of all the residents of the city and that these practices are a recognised part of place marketing for the city of Poznan.
Millennial consumers in the convenience food market
Authors: Barska Anetta
Published: June 2018

Millennial consumers in the convenience food market The demand for food products is gradually increasing, which is why understanding consumer behavior in the convenience food market is an important issue. Knowledge in this field may be useful in the process of developing marketing strategies. The purpose of the article is to present the attitude towards convenience food of the representatives of Generation Y (also known as millennials). Literature analysis and results of the author’s own surveys were used in the research proceedings. The research was conducted on a group of 364 millennial consumers living in the border area of Southwestern.
Open beam dosimetric characteristics of True Beam medical linear accelerator with flattening filter (WFF) and flattening filter free (FFF) beam
Authors: Mani Karthick Raj , Bhuiyan Md Anisuzzaman , Rahman Md. Shakilur , Azharur Islam S. M.
Published: June 2018

True Beam medical linear accelerator is capable of delivering flattening filter free (FFF) and with flattening filter (WFF) photon beams. True Beam linear accelerator is equipped with five photon beam energies (6 FFF, 6 WFF, 10 FFF, 10 WFF and 15 WFF) as well as six electron beam energies (6 MeV, 9 MeV, 12 MeV, 15 MeV and 18 MeV). The maximum dose rate for the 6 WFF, 10 WFF and 15 WFF is 600 MU/min, whereas 6 FFF has a maximum dose rate of 1400 MU/min and 10 FFF with a maximum dose rate of 2400 MU/min. In this report we discussed the open beam dosimetric characteristics of True Beam medical linear accelerator with FFF and WFF beam. All the dosimetric data (i.e. depth dose, cross-line profiles, diagonal profiles, output factors, MLC transmission, etc.) for 6 MV, 6 FFF, 10 MV, 10 FFF and 15 MV were measured and compared with the published data of the True Beam. Multiple detectors were used in order to obtain a consistent dataset. The measured data has a good consistency with the reference golden beam data. The measured beam quality index for all the beams are in good agreement with the published data. The percentage depth dose at 10 cm depth of all the available photon beams was within the tolerance of the Varian acceptance specification. The dosimetric data shows consistent and comparable results with the published data of other True Beam linear accelerators. The dosimetric data provide us an appreciated perception and consistent among the published data and may be used for future references.
The Combination of Discrete-Event Simulation and Genetic Algorithm for Solving the Stochastic Multi-Product Inventory Optimization Problem
Authors: Jackson Ilya , Tolujevs Jurijs , Reggelin Tobias
Published: June 2018

The paper describes an eventual combination of discrete-event simulation and genetic algorithm to define the optimal inventory policy in stochastic multi-product inventory systems. The discrete-event model under consideration corresponds to the just-in-time inventory control system with a flexible reorder point. The system operates under stochastic demand and replenishment lead time. The utilized genetic algorithm is distinguished for a non-binary chromosome encoding, uniform crossover and two mutation operators. The paper contains a detailed description of the optimization technique and the numerical example of six- product inventory model. The proposed approach contributes to the field of industrial engineering by providing a simple, but still efficient way to compute nearly-optimal inventory parameters with regard to risk and reliability policy. Besides, the method may be applied in automated ordering systems.
What Are The Factors Affecting No-Till Adoption In The Farming System Of Sétif Province In Algeria?
Authors: Rouabhi Amar , Laouar Abdelmalek , Mekhlouf Abdelhamid , Dhehibi Boubaker
Published: June 2018

Conservation agriculture is a concept which defines different farming systems. Its implementation depends on soil properties, climate and socio-economic considerations. Since two thousands, no-till technology; which is one facet of the conservation agriculture has begun to take place in the high plains of Sétif province-Algeria. Its adoption is facing several problems of socio-economic and technical issues. This work monitored the track of no-till adoption within a sample of 28 farmers during two years 2014 and 2016. During 2014 farmers were supported financially and technically through a subsidy program that aimed at the support of conservation agriculture via no-till technique. In 2016, the subsidy program has ended; hence, farmers have no longer incentives. Multivariate statistical analyses were performed to diagnose the evolution of no-till adoption and behavior‘s farmers between the two periods. In 2016, results showed an increase of no-till area, even though, the drop of the number of adoptive farmers by 71%. The main reasons for adopting no-till according to the adoptive farmers were the minimization of farming operation costs and saving time. However, the major impediments facing no-till adoption; were the rise of weeding charges and the concern of weed infestation especially by bromus.sp, which is a vigorous prevalent weed, which locally developed some pesticide‘s resistance. Also, the excessive use of pesticides may be considered as an environmental reason for no adopting no-till.
Assessment of microbiological and residual antibiotics status in milk sold in Abeokuta, Ogun State. Nigeria
Authors: Oluwafemi Flora , Oluwabamiwo Bosede Folashade , Oluwatosin Oluseyi Oluwajubelo , Akinrinade Olufunmilayo Ruth , Kolapo Adelodun Lawrence
Published: June 2018

This study investigated the prevalence and concentration of antibiotic residues in twenty brands of milk. Determination and quantification of antibiotic residues was done using High Performance Liquid Chromatography. Aerobic plate count was carried out and the associated bacteria isolated. Identification of bacteria was done using standard microbiological methods. Molecular characterization and identification of bacterial isolates was done using 16S rRNA gene sequencing method. Antibiotic sensitivity was carried out on bacterial isolates using disc diffusion method. Plasmid profile of drug resistant isolates was done using alkaline analysis method. Comparison of means was done using Analysis of Variance. Antibiotic residues were detected in 10 (50%) of the 20 milk brands analyzed. The residual levels of tetracycline, oxytetracycline and chlortetracycline ranged between 5ng/kg and 1569ng/kg while none of the samples had doxycycline residues. The prevalence of tetracycline residues in evaporated milk brands and powdered milk samples were 100 and 23 % respectively. The aerobic plate counts ranged from 2.5 × 102 to 6.5 × 102 CFUâˆ•mL for evaporated milk and 2.5 × 101 to 6.0 × 101 CFUâˆ•mL for powdered milk. A total of ten bacterial species were isolated and identified. Susceptibility result showed that 95% of the isolates were sensitive to erythromycin, cefuroxime and gentamycin; 12.5% were resistant to tetracycline and ampicillin, 10% were resistant to ofloxacin and 7.5% to doxycycline and penicillin. Five of the bacterial isolates were resistant to more than one class of antibiotics. Resistant isolates subjected to plasmid profiling had detectable plasmids with estimated sizes between 120bp and 1000bp. The obtained results provide evidence that the presence of antibiotic residues in evaporated and powdered milk is an indication that the public is exposed to the harmful effects of the residues.