bluuebunny/crossref_metadata_2025 huggingface dataset:
Procesos de enseñanza y de aprendizaje del número relativo en contextos de la vida cotidiana (ascensos-descensos, perdidas-ganancias) teniendo en cuenta las diferentes operaciones básicas y su respectiva representación en la recta numérica
Authors: Medina Sánchez Diego , Farfán Rincón Karen Liliana , Villalba Giraldo Diego Alejandro
Published: August 2017

El siguiente documento da cuenta de los procesos de enseñanza y deaprendizaje que se llevaron a cabo en la Institución Educativa DistritalSanta Martha con estudiantes de grado séptimo para la enseñanza delnúmero relativo en contextos de la vida cotidiana utilizando “ascensos-descensos, perdidas-ganancias” para luego llevarlo a la representaciónen la recta numérica y las distintas operaciones con estos números.Para la enseñanza del numero relativo se toman unas fases que presentan(Vargas, I. y otros, 1990), y teniendo en cuenta las fases, se propone trabajarlas primeras con una serie de situaciones contextuales, para luegoir llevándolo a campos más abstractos en las últimas etapas, y que porúltimo los estudiantes reconozcan la utilidad del numero relativo y susaplicaciones.
GeoGebraPrim como instrumento para descubrir y justificar propiedades geométricas en cuarto de primaria
Authors: Barbosa Alejandro , Escobar Andrea , Camargo Uribe Leonor
Published: August 2017

Se describe una experiencia de aula en la que el programa GeoGebraPrimdesempeña un papel en la introducción a la actividad demostrativa de estudiantesde grado cuarto de primaria, quienes son invitados a construir figurasgeométricas, explorarlas en busca de regularidades y justificar algunas propiedadescon base en otras. La experiencia se fundamenta en el constructo“actividad demostrativa” del grupo de investigación Aprendizaje y Enseñanzade la Geometría de la Universidad Pedagógica Nacional y en la definición dedemostración propuesta por Stylianides (2007)
Una propuesta para la implementación de instrumentos técnicos y conceptuales en la construcción del objeto matemático: Área de figuras planas
Authors: Santos Julián Humberto
Published: August 2017

La siguiente propuesta tiene como fin incentivar el trabajo docente en elcampo de la educación matemática, frente a la implementación en el aulade instrumentos técnicos y conceptuales que faciliten la construcción deobjetos matemáticos. Estos procesos de implementación, son un recursocasi indispensable para captar la atención de estudiantes, que han incorporadoa su desarrollo social y cultural de forma total el entorno tecnológico.Cuando un docente es capaz de incorporar en el aula instrumentosconceptuales de la mano con instrumentos técnicos, logra generar en suestudiante el gozo de ser constructor de su propio conocimiento.
¿Cómo influye el contexto al momento de hacer repartos?
Authors: Sánchez Ordoñez Eruin Alonso
Published: August 2017

La organización de contenidos en el área de matemáticas para gradoséptimo, incluye una unidad relacionada con razones, proporciones yproporcionalidad y dentro de ésta se contempla el trabajo con repartosproporcionales. Infortunadamente la naturaleza proporcional quedan los estudiantes a dichos repartos, viene inducida por el profesorquien de antemano ha seleccionado problemas típicos que aparecen enlos libros de texto, para los cuales se espera que el estudiante haga unreparto proporcional directo o inverso. Por tanto, es interesante proponera los estudiantes situaciones previas a la instrucción formal paradeterminar qué tipo de repartos predominan y cuál es la influenciadel contexto de la situación y del estudiante al decidir entre repartosproporcionales y repartos equitativos.
Gestión y Estructuración del Espacio con Profesores. Una estrategia para centrar la atención en estudiantes con dificultades de adaptación a la vida escolar
Authors: Sánchez Heredia Neila , Mejía Osorio Jeny Alexandra , Sepúlveda Sepúlveda Edison
Published: August 2017

El desarrollo practico-teórico con los participantes al taller, permite generaralgunas estrategias de intervención pedagógica para el manejo de situacionesacadémicas y disciplinarias, que ayuden a centrar y mejorar la atenciónde los estudiantes, basados en el desarrollo VIVENCIAL de la experienciade Gestión y Estructuración del Espacio, al realizar una serie de recorridossobre figuras geométricas que buscan desinhibir el sistema nervioso de lapersona, para enfrentar miedos y mejorar las relaciones interpersonales.Así mismo, los recorridos sobre las figuras geométricas ayudan a identificarla timidez, inseguridad, agresividad, dispersión, fascinación y aceptacióndurante una actividad. De ahí que la metodología propuesta por Degoumoisse desarrolle en la persona para atender las necesidades de adaptación a lavida escolar.
El Aprendizaje De Proposiciones Condicionales Usando Geometría Dinámica
Authors: Ortegón Domínguez Nabil , Salas Rodríguez Guillermo , Samper de Caicedo Carmen
Published: August 2017

A través de una serie de tareas desarrolladas con un software de geometríadinámica, buscamos propiciar la comprensión de lo que es y lo que expresauna condicional en matemáticas. Por medio de problemas propuestos, enlos cuales se debe formular una conjetura, como resultado de la exploraciónrealizada y la determinación de invariantes, se busca que los participantesdel taller comprendan que las condiciones establecidas en el antecedenteson suficientes para concluir el consecuente y que el consecuente esnecesariamente resultado de las condiciones que se reportan en elantecedente.
Procesos de Generalización y Pensamiento Algebraico
Authors: Rojas Garzón Pedro Javier , Vergel Causado Rodolfo
Published: August 2017

En las dos sesiones programadas para este taller se abordará, por una parte,algunas actividades relacionadas con generalización de patrones figuralesy/o numéricos, como recurso didáctico orientado a ubicar en los referentesteóricos elementos para el análisis de las producciones matemáticasde niños y jóvenes en torno a actividades como las antes mencionadas;por otra parte, actividades orientadas a posibilitar y potenciar conexionesentre conceptos de la matemática escolar asociados a los pensamientosnumérico, métrico y variacional.
Uso de las WebQuest como recurso educativo Potencializador del aprendizaje De la Trigonometría
Authors: Morales Munera Sandra Marian , Acevedo Agudelo Yeisson Alexis
Published: August 2017

El presente trabajo hace una descripción del análisis efectuado en estudioy aplicación de la metodología WebQuest como un recurso didácticocuya fuente de información es Internet. El propósito de esta estrategia eselaborar un Situación didáctica usando el método WebQuest como estrategiade enseñanza enfocada en la investigación que centra su interés en elaprendizaje por descubrimiento guiado. Por lo cual se diseñó una situacióndidáctica de Trigonometría que busca desarrollar y fortalecer el trabajoautónomo, habilidades para la investigación y la toma de decisiones.
Jugando con el Ecua-parqués
Authors: Mora Gómez Sandra Viviana , Cárdenas William Andrés , Feliciano Lady Julieth , Mora Mendieta Lyda Constanza
Published: August 2017

La experiencia en aula que se presenta en este documento fue desarrolladaen el marco de las prácticas iniciales de la Licenciatura en Matemáticasde la Universidad Pedagógica Nacional en el periodo 2013-I. La prácticaconsistió en preparar una clase de matemáticas haciendo uso del “Ecuaparqués”,material creado por Duarte & Caicedo (2012), maestras en formacióninicial de la UPN, partiendo de la idea de usar un juego similaral parqués para la resolución de ecuaciones lineales. El objetivo de enseñanzafue ejercitar la resolución de ecuaciones de primer grado en de laforma e identificar la propiedad uniforme de la igualdad con la suma y laresta entre números enteros.
Obras didácticas de matemática contextualizadas al Pueblo Indígena Bribri de Costa Rica, a partir de estudios etnomatemáticos
Authors: Vásquez Hernández Ana Patricia
Published: August 2017

El presente proyecto pionero en Costa Rica, se enmarca dentro del campo de la educación matemática de los pueblos originarios. Su objetivo es desarrollar capacidades en los docentes de matemática del Pueblo Indígena Bribri, para la confección colectiva de obras didácticas de matemática contextualizadas y validadas, a través de estudios etnomatemáticos. Lo anterior fortalece su identidad y el respeto por el derecho indígena a un sistema de educativo intercultural. Este proyecto será ejecutado por la Universidad Nacional, Campus Sarapiquí, y por docentes de matemática indígenas de la Dirección Regional de Educación SuLá en Talamanca, a partir del año 2014.
La psicología del conocimiento y la construcción de competencias conceptuales en los procesos de formación-The psychology of knowledge and the construction of conceptual skills formation processes
Authors: Riascos-Forero Yilton
Published: August 2017

Partiendo del estudio de los trabajos desarrollados por la profesora María Helena Fávero en la Universidad de Brasilia, en los cuales se eñala la ruptura entre las ciencias y la filosofía, que fortalece la idea equivocada de una ciencia exacta y acabada que debe ser transmitida a los estudiantes, se lleva esta discusión a la Educación Matemática articulando tres temas: la práctica de enseñanza y la de la evaluación formal; la formación de profesores y la interacción entre psicología y conocimiento. Se muestra que la formación de profesores de matemática debe considerar la filosofía y la epistemología en la construcción de sus saberes así como el desarrollo de los procesos psicológicos que soportan esa construcción, es decir, presupone la construcción de tres aspectos psicológicos: la formación de conceptos y su sistema lógico de representación; la toma de conciencia de estos conceptos y de esa lógica, y la interacción social que caracteriza la situación didáctica en la cual son construidos.
Género, Ciencia e Ingeniería: Un Problema Sociocultural -Gender, Science and Engineering: A Sociocultural Problem
Authors: Gallego-Torres Adriana Patricia , Camacho-González Johanna Patricia
Published: August 2017

-Editorial
CONSTRUCCIÓN DE LAS ECUACIONES EN LA CIENCIA FÍSICA
Authors: Holguín Tabares Carlos Arturo
Published: August 2017

¿Cómo se obtienen las “formulas” de la física? No hay respuesta simple o única, porque construir las ecuaciones algebraicas con las reglas de composición que asocian magnitudes experimentales cuando cambia o varía una en función de la otra durante un experimento, requiere de un proceso lógico y consciente; a partir de definir el concepto de variable experimental y demás magnitudes presentes en fenómenos físicos, lo cual posibilita estudiar diferentes procedimientos debidamente argumentados. Algunos de estos métodos que relacionan las variables son: el análisis gráfico con diferentes papeles, las regresiones, el uso de leyes de conservación, análisis dimensional y otros, para construir ecuaciones algebraicas.
A Hodge-type decomposition of holomorphic Poisson cohomology on nilmanifolds
Authors: Poon Yat Sun , Simanyi John
Published: August 2017

A cohomology theory associated to a holomorphic Poisson structure is the hypercohomology of a bicomplex where one of the two operators is the classical მ̄-operator, while the other operator is the adjoint action of the Poisson bivector with respect to the Schouten-Nijenhuis bracket. The first page of the associated spectral sequence is the Dolbeault cohomology with coefficients in the sheaf of germs of holomorphic polyvector fields. In this note, the authors investigate the conditions for which this spectral sequence degenerates on the first page when the underlying complex manifolds are nilmanifolds with an abelian complex structure. For a particular class of holomorphic Poisson structures, this result leads to a Hodge-type decomposition of the holomorphic Poisson cohomology. We provide examples when the nilmanifolds are 2-step.
Assessing Selection Parameters for Improving Yield in Organically Grown Onion
Authors: Brdar-Jokanović Milka , Ugrinović Milan , Ljevnaić-Mašić Branka , Stojanović Anamarija , Zdravković Jasmina
Published: August 2017

An increasing interest in organically grown vegetables has led to an increasing demand to select cultivars meeting the requirements of the production system. This two-year field study was undertaken to assess the effects of organic and conventional nutrient regimes on onion (Allium cepa L.) yield and several yield contributing characters, as well as to identify the traits that could be important when selecting genotypes attended for different production systems. The trial involved five commercially grown onion cultivars and four nutrient regimes: bacterial fertilizer, fully decomposed farmyard manure, without fertilization (organic) and NPK fertilization (conventional). Onion yield, bulb weight, number of bulbs plot−1, number of days from sowing to emergence, vegetation period, plant height, neck diameter, neck length, bulb diameter, bulb height and bulb index have been analyzed. Significant differences concerning all analyzed traits have been found among the cultivars, treatments and years, with significant corresponding interactions. The obtained results imply the specific adaptation to the particular treatments and weather conditions and therefore the possibility to select onion cultivars performing well in organic environments. Path coefficient analysis revealed positive direct effects of bulb weight and number of bulbs plot−1 on yield, as well as negative direct effects of plant height and number of days from sowing to emergence; therefore, those traits should be considered when selecting genotypes attended for different production systems. Other traits affected yield indirectly, mostly positively via bulb weight.
Progress in Research on Infection Factors in Hemodialysis Patients
Authors: Wang Hanyu
Published: August 2017

Patients with uremic diseases and in the stage of chronic renal failure are mainly treated with hemodialysis, which can extend the life and improve the quality of life of patients. Nevertheless, hemodialysis causes numerous adverse reactions, such as infection. Infection after hemodialysis treatment not only increases the suffering of patients but also increases treatment costs and risks. Therefore, hemodialysis complications are a serious global problem and have received extensive attention from clinicians and researchers. This paper provides a comprehensive description of the infection factors of hemodialysis patients. This review aims to provide the basis and guidance for controlling and preventing infection in hemodialysis patients.
Progress in the Prevention and Treatment of AIDS Associated with Tuberculosis
Authors: He Wenlong , Li Rui , Wang Yaogang
Published: August 2017

Epidemiological studies have shown that infection with the human immunodeficiency virus (HIV) is an influential risk factor for infection withMycobacterium tuberculosis(MTb), the rapid progression of the initial infection to active tuberculosis (TB), and the reactivation of latent TB infection. MTb infection is also one of the most common opportunistic infections in people with HIV, including AIDS patients receiving anti-retroviral therapy. Given the prevalence of HIV infection, the incidence of TB infection, which had begun to decline, is facing a severe situation. HIV associated with TB exerts an immense burden on the public health-care system, especially in countries with high incidences of HIV infection. Therefore, the global policies for the prevention and control of TB should be revised. Moreover, an increased investment in TB control has to be guaranteed. The purpose of this review is to summarize the recent progress in the prevention, treatment, and control of HIV and TB co-infection.
Progress in Research on Vestibular Rehabilitation Therapy
Authors: Wang Yue , Guo Qi
Published: August 2017

The deterioration of vestibular function is a side effect of numerous diseases of the inner ear. Vertigo is the most common symptom of vestibular dysfunction. Vestibule-suppressing drugs can control symptoms but impede the rehabilitation of vestibular function. Surgical treatment can effectively resolve vestibular dysfunction associated with some progressive diseases, including tumors. However, unilateral vestibular function remains permanently damaged after surgery, causing problems like vertigo and imbalance. To enhance the understanding of Vestibular rehabilitation therapy, this paper presents a summary of the progress in research on Vestibular rehabilitation therapy for patients with vestibular dysfunction.
Assessment of Ferrous Glycinate Liposome Absorption Using in Situ Single-Pass Perfusion Model
Authors: Ding Baomiao , Yi Xiangzhou , Li Li , Yang Hualin
Published: August 2017

Liposomes could be employed to improve the absorption of iron. The purpose of this study was to estimate the intestinal permeability of ferrous glycinate liposomes and to assess the effects of phytic acid, zinc and particle size on iron absorption using in situ single-pass perfusion in rats. The results showed that the absorption of ferrous glycinate liposomes was obviously higher than that of ferrous glycinate. The inhibitory effects of phytic acid and zinc on iron absorption were reduced by incorporating ferrous glycinate into liposomes. The particle size of ferrous glycinate liposomes was also a main factor for affecting iron absorption, and the intestinal permeability of the liposomes decreased with its particle size increasing. The results suggested that liposomes could be a potent delivery system to decrease the inhibitory effects of phytic acid and zinc and to enhance iron absorption. Furthermore, liposomes could alter the absorption pathways of ferrous glycinate.
Do Geographical Indications Really Increase Trade? A Conceptual Framework and Empirics
Authors: Sorgho Zakaria , Larue Bruno
Published: August 2017

Production location matters to many consumers and regulators and policymakers are pressed to statue on labels about country of origin, local foods and geographical indications (GIs). This paper investigates the incidence of the EU policy on GIs on bilateral trade flows. We develop ttheoretical arguments and provide empirical evidence to analyze heterogeneity in consumer preferences regarding country of origin (domestic versus foreign) and the implicit quality signals from GI logos. The objective of the paper is to investigate whether producing GIs really boots bilateral trade, assuming heterogeneity in consumers’ preference. We first develop an analytical framework of a simple partial equilibrium two-country model through a Cobb-Douglas utility structure to assess the impact of GIs on trade. In addition, we empirically corroborate the analytical findings with a unique data on protected GIs by product and European country. Our main findings indicate that GI-products have ambiguous effect on international trade. Indeed, their trade-impact depends on the importance of product for consumers (i. e., the intensity and the reputation of GI-product considered as deterministic weight in consumers’ preference). As expected, a heterogeneity in consumers’ preference – due to home bias about local or foreign varieties – can increase or decrease trade, despite the presence of GI-products.
Limits of Autonomy Principle in Documentary Letters of Credit; Perspective of English Law
Authors: Alavi Hamed
Published: August 2017

In this article, the author reviews the approach of English courts to limits of autonomy principle and tries to answer the following research questions: What obligations should the applicant fulfil while opening a credit in accordance with the underlying contract? What are the seller’s remedies when the buyer fails to perform his duties regarding opining and performance of the credit? On the other hand, what are the seller’s duties in the process of opening the credit and what will be the buyer’s remedy in case of his failure? What is the legal position regarding variation of the credit? What is the position of court regarding absolute or conditional nature of the credit? In order to answer the above research questions, paper is divided into seven parts: after the introductory comments, the second part will review the nature of the buyer’s obligation in opening the credit. The third part is focused on effect of non-compliance by the buyer and the fourth part studies the variation of the credit and its effect on party’s rights within the underlying contract. Part five deals with the buyer’s rights after opening the credit while part six will discuss the absolute or conditional nature of the payment obligation to pay under the LC. Last but not the least, the final part will provide some concluding remarks.
Lost in Implementation: EU Law Application in Albanian Legal System
Authors: Hajdini Bojana , Skara Gentjan
Published: August 2017

Considering the growing importance of the researchers in the area of Europeanization in the candidate countries, the purpose of this paper is to analyse whether, and to what extent EU as a legal normative power has influenced Albania to approximate existing and future legislation and to ensure proper implementation. The paper argues that the Europeanization process is pushing Albania toward greater convergence with EUacquisby developing a modern legal framework. However, the paper points out that weak implementation has hampered the application of EU law in Albania due to: a) weak bureaucracy or uneven distribution of human capacities; b) the lack of an established practice of consultation with interest groups on specific draft legislation, and c) the inability to put in sound planning mechanisms and to carry out a realistic assessment. The paper concludes that effective adjustment of Albanian legal system with EU norms requires cooperation between different actors involved in the approximation and implementation process.
Testimonial Evidence. Perspectives and Confluences
Authors: Neculcea Marius , Ionescu Bogdan
Published: August 2017

The authors aim to “drill” into the complex issue of the testimonial evidence, through a fresher approach, thus being interested, besides the purely legal aspect, also in the historical, sociological and even psychological perspective.
Legitimation of the Referendum - the Standard Mechanism of Participatory Democracy
Authors: Ușvat Laviniu Florin
Published: August 2017

The referendum is a multidimensional instrument, attested and practiced worldwide, considered to be a compulsory feature of democracy, provided it is used under strict lawfulness. The purpose of putting it into practice is to know the sovereign will of the people, expressed by vote, on a particular issue subject to its decision-making capacity. Following the referendum process, and in the case of referendum forms, such as the legislative or decision-making process, the referendum generates the obligation for the governing authorities to implement the decision adopted by the people. It is certain that the people’s response to the referendum question materializes a decision that emanates from the people, and which benefits in this way of increased legitimacy. Legitimacy is a concept that unleashes the force of the referendum, the result of which is imposed on everyone, the minority who voted against, and the governors. Legitimacy gives an institutional sense to the referendum, being an immanent part of the entire referendum process. It comes from the principle of the sovereign will of the people, which once expressed, is imposed on all the executive factors that must apply it. Legitimacy is both an intrinsic quality of the referendum and its effect, as it gives force to the outcome and justifies any political, legislative or administrative action or inaction. If the referendum process were deprived of legitimacy, or the resulting decision would be denied of this supreme attribute, then the referendum would be an artificial institution, empty of content, virtually useless.
Constitutional Justice
Authors: Moroșteș Anca-Florina , Stoicu Narcisa-Mihaela
Published: August 2017

The paper with the title “Constitutional Justice” aims to analyse a topic of urgent actuality and of particular importance in the contemporary society. We have tried to show in this paper the importance of the Constitutional control in the rule of law. Starting from the idea of necessity of existence of a Constitution in a democratic State and, implicitly, of a body to follow-up the compliance with its provision, we have tried to highlight in this paper the role of Romanian Constitutional Court and not only, by presenting one of its most important attributions which is the control of the law constitutionality.
The Need for Diversification of Forensic Tactical Rules Applicable to Crime Scene Investigation
Authors: Palcu Pavel
Published: August 2017

The unprecedented development of cybernetics was concretized by the emergence of computer technology in ways difficult to predict. In this context, the international underworld and organized crime have expanded the area of criminal acts, but equally there were new investigation possibilities for the police and judicial authorities, limiting the role of intuition and flair, of human spontaneity, the center of gravity falling on their ability to use new technology intelligence they have at their disposal.
Systematic Optimization for Optical Coherence Tomographic Imaging
Authors: Chen Po-Hsiung , Sun Chia-Wei
Published: August 2017

Optical coherence tomography is a powerful tool that can effectively provide detail information of biological tissue structure. The axis resolution of optical coherence tomography has achieved sub-micrometer and we are interested in its ultrahigh resolution that can be practically utilized for clinical application. In this article, the basic system calibration is discussed; we systematically demonstrated the detail process in optimization of optical coherence tomography for accurately acquiring data. The systematic optimization for optical coherence tomography imaging is discussed here including system calibration and image post-processing.
Trends in confidence in public institutions: A comparative analysis of the Baltic countries
Authors: Gudžinskas Liutauras
Published: August 2017

The paper focuses on the variation of institutional confidence in the Baltic countries. Within of framework of qualitative comparative framework, it employs a historical approach to detect causes of divergence of trust in rule of law institutions between Estonia vis-à-vis other two Baltic states. While it observes a range of variables that could affect the differences, it emphasises the role of political leadership during critical junctures, which might explain both why Estonia forged ahead at the outset of the post-communist transformation and most recent positive developments in the Baltic countries since the financial crisis in 2008–2010.
Distributed containment control of heterogeneous fractional-order multi-agent systems with communication delays
Authors: Yang Hongyong , Han Fujun , Zhao Mei , Zhang Shuning , Yue Jun
Published: August 2017

Because many networked systems can only be characterized with fractional-order dynamics in complex environments, fractional-order calculus has been studied deeply recently. When diverse individual features are shown in different agents of networked systems, heterogeneous fractional-order dynamics will be used to describe the complex systems. Based on the distinguishing properties of agents, heterogeneous fractional-order multi-agent systems (FOMAS) are presented. With the supposition of multiple leader agents in FOMAS, distributed containment control of FOMAS is studied in directed weighted topologies. By applying Laplace transformation and frequency domain theory of the fractional-order operator, an upper bound of delays is obtained to ensure containment consensus of delayed heterogenous FOMAS. Consensus results of delayed FOMAS in this paper can be extended to systems with integer-order models. Finally, numerical examples are used to verify our results.
Simulation of counter-current imbibition in water-wet fractured reservoirs based on discrete-fracture model
Authors: Wang Yueying , Yao Jun , Fu Shuaishi , Lv Aimin , Sun Zhixue , Bongole Kelvin
Published: August 2017

Isolated fractures usually exist in fractured media systems, where the capillary pressure in the fracture is lower than that of the matrix, causing the discrepancy in oil recoveries between fractured and non-fractured porous media. Experiments, analytical solutions and conventional simulation methods based on the continuum model approach are incompetent or insufficient in describing media containing isolated fractures. In this paper, the simulation of the counter-current imbibition in fractured media is based on the discrete-fracture model (DFM). The interlocking or arrangement of matrix and fracture system within the model resembles the traditional discrete fracture network model and the hybrid-mixed-finite-element method is employed to solve the associated equations. The Behbahani experimental data validates our simulation solution for consistency. The simulation results of the fractured media show that the isolated-fractures affect the imbibition in the matrix block. Moreover, the isolated fracture parameters such as fracture length and fracture location influence the trend of the recovery curves. Thus, the counter-current imbibition behavior of media with isolated fractures can be predicted using this method based on the discrete-fracture model.
Improved epoxy thermosets by the use of poly(ethyleneimine) derivatives
Authors: Acebo Cristina , Ramis Xavier , Serra Angels
Published: August 2017

Epoxy resins are commonly used as thermosetting materials due to their excellent mechanical properties, high adhesion to many substrates and good heat and chemical resistances. This type of thermosets is intensively used in a wide range of fields, where they act as fiber-reinforced materials, general-purpose adhesives, high-performance coatings and encapsulating materials. These materials are formed by the chemical reaction of multifunctional epoxy monomers forming a polymer network produced through an irreversible way. In this article the improvement of the characteristics of epoxy thermosets using different hyperbranched poly(ethyleneimine) (PEI) derivatives will be explained.
Infrastructure Development Versus Direct Cash Transfer: A General Equilibrium Comparison
Authors: Marjit Sugata , Mandal Biswajit , Chatterjee Tonmoy
Published: August 2017

This paper attempts to provide an explanation to the debate whether infrastructure development is more effective than direct cash transfer to reduce wage disparity between skilled and unskilled workers. We use a simple general equilibrium structure to argue that in presence of symmetric productivity effects direct cash transfer meets the target when such transfer is financed by tax revenue collected from skilled wage bill. Nevertheless, in case of asymmetric productivity effects the arguments boil down to how different sectors absorb infrastructural facility to improve their productivity.
TURISMO Y TERRITORIO EN LAS MÁRGENES DEL LAGO ATITLÁN, GUATEMALA
Authors: Sánchez-Crispín Álvaro , Propin-Frejomil Enrique
Published: August 2017

Este trabajo tiene como objetivo explicar el arreglo territorial suscitado por el crecimiento reciente de la actividad turística en uno de los lugares emblemáticos de Guatemala, el lago Atitlán. Alrededor de éste, y en un marco geográfco-físico imponente, se encuentran diez poblados, de origen maya y de lenguas kaqchiqel y tz’utujil, de pequeño tamaño demográfco, con una cultura viva diversa y que tratan de hallar su nicho en un mercado turístico altamente competitivo. Para lograr esto, en primera instancia, se hace alusión al escenario de acogida del turismo a partir de una explicación geográfca general del país y en particular del lago, de las áreas naturales protegidas, ya que el lago se encuentra inserto en una de ellas, la Reserva de Usos Múltiples de la Cuenca del lago Atitlán, y de la propia actividad turística. Enseguida se procede a explicar los principales centros de la economía del turismo en el lago y se reﬂexiona acerca de la relación inexistente entre la promoción de estos lugares y la presencia del área protegida.
Conversation with Ted Jackson, Carleton University
Authors: Jackson Edward , Khanenko-Friesen Natalia
Published: August 2017

In the Exchanges, we present conversations with scholars and practitioners of community engagement, responses to previously published material, and other reflections on various aspects of community-engaged scholarship meant to provoke further dialogue and discussion. We invite our readers to offer in this section their own thoughts and ideas on the meanings and understandings of engaged scholarship, as practiced in local or faraway communities, diverse cultural settings, and various disciplinary contexts. We especially welcome community-based scholars’ views and opinions on their collaboration with university-based partners in particular and on engaged scholarship in general. Natalia Khanenko-Friesen talks to Edward “Ted” Jackson about his work and his views on engaged scholarship in Canada. Dr. Jackson is a senior research fellow of Carleton Centre for Community Innovation and adjunct research professor in Public Policy and Administration, International Affairs and African Studies at Carleton University, Ottawa. Ted Jackson served as a the conference convenor for C2UExpo, held at the Carleton in May 2015.
Tratamiento del síndrome de apnea-hipopnea obstructiva del sueño (SAHOS) con presión positiva en la vía aérea (PAP)
Authors: Campo Felipe , Sanabria-Arenas Fernando , Hidalgo-Martinez Patricia
Published: August 2017

Para el tratamiento de cualquier enfermedad es necesario un adecuado manejo multidisciplinar e involucrar al paciente en la mejor opción que se requiera a largo plazo; la falta de tratamiento de los pacientes implica una enorme carga para el sistema sanitario y la sociedad. En la actualidad, existen diferentes tratamientos para los pacientes con síndrome de apnea-hipopnea obstructiva del sueño (SAHOS); el de mayor elección, después de descartar anomalías anatómicas susceptibles de cirugía, es el PAP (presión positiva en vía aérea). Las indicaciones para terapia con PAP incluyen pacientes con índice de apnea-hipopnea (IAH) ≥15 eventos/hora o ≥5 y ≤14 eventos/hora y quejas de somnolencia diurna excesiva, deterioro cognitivo, trastorno del afecto o insomnio, hipertensión arterial documentada, enfermedad arterial coronaria o historia de evento cerebrovascular. Es importante recordar que el IAH debe basarse en sueño ≥2 horas de registro polisomnográfico. Hay diferentes modalidades de tratamiento con PAP y se debe intervenir para buscar mejorar la adherencia al dispositivo, principal limitante para alcanzar la eficacia en el tratamiento. El impacto del tratamiento del SAHOS ha sido investigado, pero la mayoría de los estudios reportados son de carácter observacional.
Factores de riesgo y asociados al síndrome de apnea-hipopnea obstructiva del sueño (SAHOS)
Authors: Páez-Moya Sylvia , Vega-Osorio Pablo Alejandro
Published: August 2017

Los avances alcanzados en la medicina del sueño y en los trastornos respiratorios del sueño han permitido conocer y entender los mecanismos fisiopatológicos que favorecen la aparición de estos últimos, a la par que han ayudado a determinar cuáles son los factores de riesgo anatómicos, morfológicos, poblacionales, demográficos, raciales y sindromáticos relacionados.Conocer los factores de riesgo de los trastornos del sueño permite desarrollar medidas terapéuticas enfocadas a su origen. Tienen especial importancia aquellos factores modificables como el sobrepeso/obesidad, el tabaquismo y el consumo de depresores del sistema nervioso central, ya que prevenirlos puede tener un impacto en la prevención de la aparición del síndrome de apnea-hipopnea obstructiva del sueño
Tratamiento médico del síndrome de apnea-hipopnea obstructiva del sueño (SAHOS)
Authors: Parejo-Gallardo Karem Josefina , Saltos-Cristiano Claudia Mariana
Published: August 2017

El tratamiento de síndrome de apnea obstructiva del sueño busca solucionar los signos y síntomas relacionados con la enfermedad, así como la reducción del índice de apnea-hipopnea y las desaturaciones, para así disminuir los riesgos y comorbilidades vinculados a este trastorno. Sin embargo, esta enfermedad requiere tratamiento a largo plazo, con terapias combinadas y desarrolladas por un equipo multidisciplinario. El tratamiento médico se debe realizar en todos los pacientes, aun si se requieren terapias adicionales. Asimismo, este síndrome se puede asociar a otras enfermedades que necesitan tratamiento específico.
Sufism Scholars Network in the Middle East, India, and Indonesia
Authors: Afrianti Dwi
Published: August 2017

The history of Islam in Indonesia cannot be separated from the affected of local culture, religion, belief earlier, and culture of the spreader of Islam which are also influenced by religion and beliefs held previously, as well as the entry period into certain areas of different life times, willingness to form the teachings of the scholars/king. All of this shows the complexity of the uniqueness of Islam in Indonesian as the majority religion among diverse religions in Indonesia. Sufism are directly involved in the spread of Islam in Indonesia with a unique teaching that facilitate the engaging of non-Muslim communities into Islam, compromise or blends Islam with religious and beliefs practices rather than local beliefs change from an international network to the local level. The terms and the elements of the pre-Islamic culture are used to explain Islam itself. Islamic history of Sundanese, there is a link in teachings of Wihdat al-Wujud of Ibn al-‘Arabi who Sufism Scholar that connected between the international Islamic networks scholars and Sundanese in Indonesia. It is more popular, especially in the congregation of Thariqat Syattariyah originated from India, and it is widespread in Indonesia such as Aceh, Minangkabau and also Pamijahan-Tasikmalaya that brought by Abdul Muhyi since 17th century ago.
Kindlin-2 Association with Rho GDP-Dissociation Inhibitor α Suppresses Rac1 Activation and Podocyte Injury
Authors: Sun Ying , Guo Chen , Ma Ping , Lai Yumei , Yang Fan , Cai Jun , Cheng Zhehao , Zhang Kuo , Liu Zhongzhen , Tian Yeteng , Sheng Yue , Tian Ruijun , Deng Yi , Xiao Guozhi , Wu Chuanyue
Published: August 2017

Alteration of podocyte behavior is critically involved in the development and progression of many forms of human glomerular diseases. The molecular mechanisms that control podocyte behavior, however, are not well understood. Here, we investigated the role of Kindlin-2, a component of cell-matrix adhesions, in podocyte behavior in vivo. Ablation of Kindlin-2 in podocytes resulted in alteration of actin cytoskeletal organization, reduction of the levels of slit diaphragm proteins, effacement of podocyte foot processes, and ultimately massive proteinuria and death due to kidney failure. Through proteomic analyses and in vitro coimmunoprecipitation experiments, we identified Rho GDP-dissociation inhibitor α (RhoGDIα) as a Kindlin-2–associated protein. Loss of Kindlin-2 in podocytes significantly reduced the expression of RhoGDIα and resulted in the dissociation of Rac1 from RhoGDIα, leading to Rac1 hyperactivation and increased motility of podocytes. Inhibition of Rac1 activation effectively suppressed podocyte motility and alleviated the podocyte defects and proteinuria induced by the loss of Kindlin-2 in vivo. Our results identify a novel Kindlin-2–RhoGDIα–Rac1 signaling axis that is critical for regulation of podocyte structure and function in vivo and provide evidence that it may serve as a useful target for therapeutic control of podocyte injury and associated glomerular diseases.
Iniciativas para conservar la biodiversidad
Authors: Varea Anamaría
Published: August 2017

Iniciativas para conservar la biodiversidad
Tres notas sobre conflictos e interculturalidad en el centro sur de la Amazonia
Authors: Ortiz Pablo
Published: August 2017

Tres notas sobre conflictos e interculturalidad en el centro sur de la Amazonia
Para un contexto nuevo de los cuentos ‘realistas’ de josé de la cuadra
Authors: Corral Wilfrido
Published: August 2017

Para un contexto nuevo de los cuentos ‘realistas’ de josé de la cuadra
Sociología de la infancia y política social: ¿Compatibilidades posibles?1
Authors: Unda Lara René
Published: August 2017

Sociología de la infancia y política social: ¿Compatibilidades posibles?1
Effect of the Contact Angle between the Cutting Edge and Surface of Cut on the Flank Wear Width in Turning Operations
Authors: Baban Sherko , Kasab Safeen
Published: August 2017

In metal cutting studies, the flank wear width (VB) is commonly used as a criterion or as a limit

measure for the cutting tool life. From the point view of this work, there is a critique concerning the traditional

limit measure (vB). The researchers in this domain do not take the diameter of the work-piece into

consideration. In this situation, the contact angle, between the tool and the work-piece, should be determined

from the limit measure of flank wear width. This work deals with the effect of the work-piece diameter on the

limit measures and proposes a related limit measure for each diameter' For the experimental approach, certain

confirmation tests were achieved. It seems that the work-piece diameter could modify the limit measure and it

could be increased for large diameters, or decreased for small ones.
Study of earthquake waveforms from a new deployment of seismographic stations in northern Iraq
Authors: Ahmed Omar , Aziz Bakhtiar
Published: August 2017

This study is to investigate four different body wave phases from events recorded by eight modern broad-band seismographic stations (NISN) installed in northeastern Iraq. From this network of stations which is distributed in Kurdistan region, a three-component digital data obtained that have been recorded continuously at a rate of 100 sps. The analyses include identifying the P- and S-wave phases from different azimuths and locating the events. The processed local and regional earthquakes which have been recorded in the studied area were in the close proximity to the northeastern border of the Arabian plate and occurred over a period between (2010-2012). In this study, the hypocentral depths are derived from the picked arrival times of P/Pg/Pn, S/Sg and Sn phases and a map was drawn which depicts the epicentral distances for the analyzed waveforms. Furthermore, the source magnitude has been calculated from the amplitude of the wave energy. The resulting events distribution reveals a distinct picture of the interaction between seismicity and seismotectonics of the region. The highest seismicity rate seems to be confined to the exceedingly active northern section of the Zagros thrust zone.
Study the effect of surface sealant on microleakage in class V cavities filled by different restorative materials
Authors: Saeed Niaz , Mhammed Gollshang , Saeed Hawzheen
Published: August 2017

The aim of this study was to evaluate the effect of unfilled resin sealant coating on marginal leakage in decreasing microleakage in class v cavities using PROMEDICA light cure Nano-ceramic composite and nono glass ionomer filling material (EQUIA system). Twenty extracted sound human upper premolars has been selected, Standardized class v cavity with butt-joint marginal configuration were prepared in the middle third of the buccal and palatal surfaces of the tooth. The teeth were randomly divided into four groups of five teeth. Cavities of group 1 were restored with nano composite only , group 2 were restored with nano composite coated with unfilled resin sealant,group3 were restored with light curing nano glass ionomer filing only, and group4 were restored with light curing nonoglass ionomer filing . After rinsing and drying one thin coat of unfilled resin sealant was applied and were light polymerized for 15 seconds. The procedures for dye penetration using Methylene Blue dye were followed and examined under stereomicroscope for evaluation. The data collected were analyzed statistically using paired t test. Nanocomposite recorded less microleakage than nanoglass ionomer cement at occlusal and cervical margins. Results showed that restorations were coated with resin sealant showed significantly less dye penetration in comparison with uncoated surfaces. For nanocomposite filling material p value= 0.002 while for nano glass ionomer filling material p value=0.0047. Though the coating of unfilled resin sealant did not completely eliminated microleakage, unfilled resin sealant was effective in reducing microleakage of the esthetic restorations in class V restorations.
Parental practices contributing to the child's neuroses emergence
Authors: Ragulina O.A. , Fokina A.V.
Published: August 2017

The article is devoted to the overview of modern foreign studies exploring the nature, symptomatology and factors of neurotic disorders. The matter of estimating prevalence of neurotic disorders is being discussed. It provides information about somatic-vegetative and affective symptoms of neurotic disorders, depending on psychological factors (in particular, attachment, parenting style, marriage relationships, parental business, degree of awareness of psychogenic character of disorders). It also describes foreign studies, which show the role of psychogenic factor in the development of such disorders as ADHD, opposition-defiant disorder and learning disabilities. Parental practices contributed to child neurotic disorders emergence is analyzed. The "helicopter parents" and "lawnmower parents" are described. Authors use their experience of psychological work with families to describe some of these practices: "rejection of differentiation", "anxiety escort", "child's rectification".
TRAMA INSTITUCIONAL E RELAÇÕES DE PODER NOS BALDIOS DO PARQUE NACIONAL DA PENEDA-GERÊS
Authors: Luz Ana Luísa
Published: August 2017

Os baldios são terras comunitárias historicamente geridas para pastagem, integradas nos sistemas agrícolas de subsistência. Hoje localizam-se sobretudo nas montanhas do norte do país. A modernização tecnológica da agricultura, a florestação pelo Estado Novo (1938-1968), a emigração nos anos 1950-1960s e o decorrente declínio da actividade agrícola criaram uma nova conjuntura económica e social para os baldios. Em 1986 a adesão à União Europeia (UE) e a submissão à Política Agrícola Comum (PAC) reflectiu-se também nestes espaços e respectivas instituições.Entrevistas semiestruturadas, efectuadas nos trinta baldios existentes no Parque Nacional da Peneda-Gerês (PNPG), permitiram analisar o tipo de uso e de utilizadores e as estratégias de gestão implementadas nos baldios desta região.Sobretudo em áreas protegidas e adaptando-se a directivas da UE, o baldio começa a assumir um papel relevante na conservação da natureza e do património cultural. Ao mesmo tempo o turismo assume-se cada vez mais como uma panaceia para as dificuldades do mundo rural. Nos baldios do PNPG, embora o turismo tenha presença e os subsídios auxiliem a manutenção dos espaços naturais e culturais, verifica-se que o baldio não acede às contrapartidas geradas por essa procura, ainda que as comunidades beneficiem dela indirectamente. Até que ponto o turismo constitui uma alternativa eficaz à produção agrícola irá depender em grande parte da vontade dos compartes e da capacidade negocial dos órgãos gestores dos baldios.
Origem e evolução humana na concepção de jovens estudantes brasileiros do Ensino Médio
Authors: Oliveira Graciela Silva , Bizzo Nelio Marco Vincenzo
Published: August 2017

Este trabalho apresenta a concepção de estudantes brasileiros do Ensino Médio acerca da evolução humana, e as interações das mesmas com variáveis socioculturais. Participaram da pesquisa 2404 estudantes (55,1% meninas) matriculados no 1º ano do Ensino Médio de 78 escolas. Foi aplicado um questionário e os dados coletados foram analisados com auxílio do software Statistical Package for Social Science - versão 18.0. Os resultados encontrados apontam que há influência da religião e das demais variáveis testadas (sexo, idade, região do país em que residem e níveis socioeconômicos). Além disso, constatou-se que as ideias dos jovens sobre a evolução humana indicam ser o resultado de um ensino que não coloca a teoria evolutiva como eixo central da Biologia, aparentando, por conseguinte, ser omisso a discussões sobre a história do homem na Terra no Ensino Fundamental.