bluuebunny/crossref_metadata_2025 huggingface dataset:
Songs of Exile: Music, Activism, and Solidarity in the Latin American Diaspora
Authors: Bucciferro Claudia
Published: July 2017

This article addresses the connection between music and social activism in Latin America, centering on a discussion of ‘the music of exile’ as a cultural artifact of historical and conceptual significance for diasporic Latin American communities. The music produced by artists who were persecuted during the years of military rule was characterized by an engagement with social and political affairs, and often helped bring people together in the struggle for democratization. Despite censorship laws and other repressive measures enacted by the dictatorships, the music not only endured, but traveled across nations and continents, carried by the millions of people who were displaced due to State-sponsored violence. Now distributed through new media platforms such as YouTube, this music functions as a repository of memory and an emblem of solidarity that connects dispersed Latin American communities. Using Cultural Studies as a theoretical framework and employing an interpretive methodology, this study focuses on a selection of songs written between 1963 and 1992, presenting an analysis that centers on their lyrics and connects their meanings to larger social processes.
¿Es el conocimiento del turismo una ciencia? Y si no lo es, ¿puede serlo?
Authors: Muñoz de Escalona Francisco
Published: July 2017

Habrá quien responda a la primera pregunta, sin dudarlo, de modo afirmativo. Así lo asume la comunidad internacional de los expertos que se tienen a sí mismos comocientíficos. Muy pocos estudiosos se atreverían a defender lo contrario, entre otras cosas, porque se expondrían a no formar parte de la mencionada comunidad. La pregunta puede ser extemporánea, pero el autor está convencido de que hacerla de nuevo tiene la virtud de cuestionar las abundantes formulaciones dogmáticas que pueblan la doctrina convencional. La crítica constructiva es el camino que lleva a la ciencia. La necesidad del debate es, por tanto, imperiosa.
Turismo hoy: entre el cisne negro y la realidad de la ficción
Authors: Sánchez Arciniegas Clara Inés
Published: July 2017

El presente ensayo parte de asimilar la metáfora de El cisne negro de Nassim Taleb con el fenómeno del turismo para indagar sobre los efectos del terrorismo en el comportamiento difícil de pronosticar de las hordas de turistas que viajan por el planeta. Su escritura concluyó en junio de 2016 y es consecuente con lo impredecible de los acontecimientos a posteriori. Aquí no se recogen ni analizan estadísticas de turismo bajo modelos o métodos de análisis; de lo que se trata es de hacer una aproximación deductiva con base en la observación de las noticias y publicaciones sobre turismo que circulan en redes sociales. Por una parte, están las noticias en torno a las consecuencias de los atentados terroristas que perturban al mundo a nivel global y que impactan los destinos turísticos; por otra, aquellas que circulan en la otra realidad paralela, la del mundo idílico de cifras exitosas y alentadoras para el turismo global, la promoción de los viajes y la circulación de experiencias de viajeros en las redes sociales. Como en la novela de Taleb, la ficción de personajes reales. El ejercicio de triangulación de fuentes no llega a ser concluyente, pero sí indicativo de la existencia de una vasta información, de una prolija circulación de imágenes y de la amplia existencia de literatura sobre el turismo (alguna con interesantes aproximaciones interdisciplinarias al fenómeno de la relación entre terrorismo y turismo), que ve reducido su ámbito de difusión por cuenta de un mar de escritos, en buena medida carentes de estudios profundos que permitan conocer más a fondo este fenómeno como un fenómeno social y económico, más allá del marketing, una temática altamente privilegiada por la producción de textos. El cisne de momento perturba, pero como reacción, la industria de los viajes y el turismo se acomoda.
La imagen percibida de Tierra del Fuego (Argentina) en los relatos de viaje publicados en “TravelPod”
Authors: Mosti Patricia Andrea , Sallies Jorge
Published: July 2017

La idea de “Fin del Mundo” –asociada con la ubicación extrema, condiciones ambientales hostiles, paisajes inhóspitos y, en apariencia, prístinos– forma parte constitutiva de la identidad territorial de la Patagonia austral. La cartografía, las expediciones científicas, las misiones religiosas, el periodismo y la literatura han jugado un papel importante en la difusión y permanencia de estas representaciones. En las sociedades occidentales modernas, estas representaciones se posicionaron como poderosos recursos turísticos capaces de motivar los desplazamientos de los viajeros a Tierra del Fuego. La presente comunicación propone un acercamiento a la imagen percibida de Tierra del Fuego según los relatos de los turistas en blogs de viajes, tomando como fuente las crónicas publicadas en el sitio Travelpod. El objetivo se orienta en examinar los contenidos de la imagen percibida e indagar sobre los modos en que se resignifica el concepto “Fin del Mundo”. Los testimonios de los turistas apelan permanentemente a la idea del Fin del Mundo. Estas representaciones condensan dos dimensiones: una vinculada a aspectos físicos-geográficos y otra que recrea contenidos simbólicos. En las imágenes percibidas de Tierra del Fuego se entremezclan lo arcaico, la leyenda y la lejanía, la inexpugnable vastedad de la naturaleza y el recuerdo de expediciones heroicas.
Análisis de comentarios en redes sociales para mejorar la reputación online hotelera
Authors: Moya Sánchez Daissy Hatblathy , Majó Fernández Joaquim
Published: July 2017

En la actualidad, los hoteleros presentan problemas con el manejo de la reputación en línea debido a las malas críticas que reciben en las redes sociales. El objetivo de la presente investigación es detectar los factores clave que se deben tener en cuenta en la operación de cada hotel para evitar comentarios negativos y poder mejorar la reputación en línea. Se analizaron las opiniones recibidas por medios virtuales en 57 hoteles latinoamericanos pertenecientes a la cadena hotelera GHL desde el 31 de marzo de 2015 hasta el 31 de marzo de 2016. Mediante el uso del programa Revinate, los comentarios se clasificaron por departamento, y se elaboró un manual de buenas prácticas. A partir del análisis de los comentarios, se elaboraron recomendaciones sobre seis ámbitos de los hoteles: Habitaciones, Alimentos y Bebidas, Recepción, Centro de Negocios, Seguridad y Gerencia, para optimizar la calidad en los hoteles y de esta forma mejorar la reputación en línea.
Turismo solidario y comunitario en Chaguaní y Pulí (Cundinamarca), una alternativa económica sustentable
Authors: Jiménez Robles Johana Andrea
Published: July 2017

Este artículo muestra el proceso para el desarrollo de un producto turístico con dos formas de gestión que en Colombia no se desarrollan conjuntamente: turismo solidario y comunitario, siendo estos similares, ya que generan un desarrollo económico de las poblaciones con altos índices NBI (necesidades básicas insatisfechas) y promueven la conservación y preservación del patrimonio cultural y natural. Para el desarrollo del estudio se utilizaron dos metodologías: exploratoria, siendo el turismo solidario un tema poco estudiado en Colombia, y descriptiva, ya que se analizaron características de las comunidades seleccionadas. Se observa que existe una población con altos índices de NBI y con interés en superarlos aprovechando su riqueza natural y cultural, además de una demanda interesada en aportar en proyectos que beneficien a terceros. Es así que se plantearon dos subproductos bajo un producto “paraguas” y estrategias acompañadas de programas que permitan el desarrollo de este.
Odd mean labeling for two star graph
Authors: Sudhakar S. , Francis Silviya , Balaji V.
Published: July 2017

In this paper further result on odd mean labeling is discussed. We prove that the two star G = K
1,m
∧ K
1,n
is an odd mean graph if and only if |m − n| ≤ 3. The condition for a graph to be odd mean is that p ≤ q + 1, where p and q stands for the number of the vertices and edges in the graph respectively.
Permian, Bakken Operators Face Produced Water Challenges
Authors: Whitfield Stephen
Published: July 2017

With the oil price market slowly recovering in recent months, hydraulic fracturing activity may increase at faster rates than previously expected. However, even with higher oil prices, operators in shale plays still face significant budgetary issues with regards to water management. As demand and usage increase, and saltwater disposal wells (SWDs) fill to capacity, companies looking to stay afloat will have little choice but to find alternative means to store and reuse their produced water.

“Costs will go up, and the industry needs to be prepared,” Piers Wells, chief executive officer of Digital H2O, said. “What this drives us toward is the conclusion that increased water reuse will likely be an operational necessity in a recovering oil price environment.”

This article examines some of the water management issues facing companies in the Permian Basin and the Bakken, two plays with different geologic features but similar needs to handle rising produced water volumes.

Permian Issues

The downturn put stress on operators in the Permian Basin, but despite the financial difficulties hydrocarbon and water production remained at high volumes. Digital H2O, a company that specializes in oilfield water resource forecasts, claimed that this was primarily due to the large number of wells completed between 2012 and 2014. Over the same time period, water intensity has gone up. In a company webinar, Wells said that the amount of water used per well completion has increased, and more water has been generated per well and per horizontal foot of wellbore length.

While completion activity has led to an increase in water intensity in the Permian, the basin’s SWD capacity is facing heavy constraints in key areas. Wells estimated that the average pressure utilization for SWDs was 65% in 2016, with several wells reporting utilization approaching 100%.

Fig. 1 illustrates the average monthly water volume disposed in an SWD compared to the average pressure utilization for SWDs for each county in the Permian Basin. A range of 60% to 80% utilization is considered high, and anything above that is considered full utilization, meaning that the wells in that county cannot accept any additional water for disposal. Wells identified four counties—Gaines, Yoakum, Kent, and Hockley—that are either at high or full utilization, with several other counties nearing the lower bound of the high utilization range.
Systematic Coiled-Tubing-Efficiency Improvement Reduces Operational Time
Authors: Wilson Adam
Published: July 2017

This article, written by Special Publications Editor Adam Wilson, contains highlights of paper SPE 184779, “Consistent, Systematic Approach to Deepwater Coiled-Tubing-Efficiency Improvement Substantially Reduces Operational Time, Gulf of Mexico,” by Peter Weiland, SPE, Alexander Rudnik, SPE, and Eric Gagen, SPE, Schlumberger, prepared for the 2017 SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition, Houston, 21–22 March. The paper has not been peer reviewed.

Deepwater coiled-tubing (CT) well interventions can benefit from significant rig-time reduction and cost savings associated with improved efficiencies of surface processes. Efficiency improvement requires a systematic approach and detailed analysis of each part of the process. The efficiency methodology allows for systematic improvement in all areas of CT operations, specifically for surface activities. The total efficiency solution described in this paper requires no additional cost to service providers, and results can be seen immediately.

Deepwater Coiled Tubing

The use of CT for well intervention can provide many downhole solutions throughout the life of a well. Although there is much discussion of the financial and technical aspects of CT in the industry, less conversation is directed toward the efficiency of CT surface processes.

The expansion of analysis, specifically to CT process efficiency both before and after in-hole operations, is necessary for a holistic approach to total efficiency improvement. The stages of CT operation shown in green in Fig. 1 can be identified as five distinct surface activities.

Design Methodology

The first stage of the efficiency solution involved analysis of past performance. Some limited performance data were collected and reviewed, primarily on CT rig up, pressure testing, and transition time between CT and wire services (wireline and slickline).

The underlying strategies of several widely accepted continuous-improvement programs, such as lean principles and the define/measure/analyze/implement/control methodology, were used to provide the link between performance and improvement.

Low-performance areas and areas of recurring nonproductive time (NPT) were addressed through root-cause analysis and remedial-work plans that were focused on specific tasks. Mean-while, high-performance areas were analyzed to document the best practices for efficient operational execution so that efficiency gains could be realized for the duration of the campaign.

Performance is compared with both baseline and previous-operation performance data so that trends and inconsistencies could be identified easily.

Equipment Mobilization/Demobilization and Lifting

The first stage of any CT operation involves mobilizing the required equipment to location. A typical CT spread may require 30 to 45 individual lifts to move equipment from the workboat to the rig. This first process, termed boat work and equipment spotting, is most commonly tracked by total time required to place the entire CT spread on deck.
Coiled Tubing With Real-Time-Measurement Tools Helps Overcome Stimulation Problems
Authors: Wilson Adam
Published: July 2017

This article, written by Special Publications Editor Adam Wilson, contains highlights of paper SPE 184753, “Overcoming Challenges of Stimulating a Deepwater, Frac-Pack-Completed Well in the Gulf of Mexico Using Coiled Tubing With Real-Time Downhole Measurements,” by Eric J. Gagen, SPE, Schlumberger, Alex D. Menkhaus, Kellogg School of Management, prepared for the 2017 SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition, Houston, 21–22 March. The paper has not been peer reviewed.

The treatment in a deepwater, frac-packed well with fiber-optic-equipped coiled tubing (CT) and a rotating, hydraulic high-pressure jetting tool achieved successful stimulation of a 500-ft-long frac-packed zone after several previous failures using different techniques. By using CT equipped with fiber optics and downhole measurement tools, engineers were able to perform a data-driven operation based on real-time bottomhole measurements and distributed-temperature surveys. This successful treatment improved productivity by 75% compared to the well before treatment.

Introduction

Diagnostic work indicated that a well had considerable skin and flow impairment. Several acid treatments had been bullheaded into the well since initial completion. The treatments were ineffective, either producing no material results or producing only short-lived improvements with a quick return to original conditions.

Slickline diagnostic work conducted on the well indicated the possible presence of a mechanical obstruction or fish of some sort near the bottom of the lower lobe of a sand package in the well. However, lacking correlated depth measurements, it was unclear whether this obstruction was below the entire producing zone or high enough to obstruct some of the lower screen section.  

The formation consists of two lobes of one sand package at an approximate angle of 33°. On the basis of log data and core samples, the permeability of the formation across these lobes was highly variable. On the basis of that variability, it was believed that the most likely scenario was that the upper portion of the lower lobe was the highest-conductivity region of the completion and that the previous acid treatments had mostly been stimulating that portion of the well to the detriment of other areas. It was believed that the more-laminated-looking pay in the upper lobe, in particular, was underperforming.

Several problems had to be overcome to make another stimulation successful:

There was uncertainty about exactly what the production problem was with the well.

Conducting the stimulations would incur high cost.

Excessive interruptions of new well-drilling operations would threaten to put production from new wells behind schedule.

The fracture pressure of the zone was 12,700 psi, but the pore pressure was 12,100 psi, leaving only a small pressure margin to perform an operation at matrix injection rates.
Challenges During Surface-Facility-Project Implementation for a Full-Field Polymer Flood
Authors: Wilson Adam
Published: July 2017

This article, written by Special Publications Editor Adam Wilson, contains highlights of paper SPE 181615, “Challenges During Execution, Construction, and Operational-Readiness Phase of Surface Facilities in a Full-Field Polymer-Flood Project,” by Santosh Mohanram, Premashis Bhaumik, SPE, and Shagun Jain, SPE, Cairn India, prepared for the 2016 SPE Annual Technical Conference and Exhibition, Dubai, 26–28 September. The paper has not been peer reviewed.

This paper presents key challenges in surface-facilities project implementation during the construction and operational-readiness phase of a project and presents results from full-field implementation. The key areas discussed are operational difference in the available technologies for concentrated-polymer dissolution, transfer of viscous polymer mother solution with minimal viscosity loss, efficacy of the pumping facility with high-viscosity non-Newtonian liquid, and supply-chain strategy.

Introduction

Because of positive responses from an enhanced-oil-recovery pilot, a full-field polymer-flood development plan was implemented in the Mangala field in India. Selecting the right facility design was of paramount importance once the pilot study confirmed the benefits of polymer flood over waterflood. A multilayered pattern drive with 129 injectors in an intense brownfield execution poses immense challenges for facility engineering. Thus, the world’s largest polymer- injection plant was built, primarily by scaling up the pilot.

New Facility

The current facility setup consists of remote well pads with both producing and injection wells connected with the production-fluid and injection-water network.

A central polymer-preparation facility was constructed to prepare the concentrated polymer solution, called the mother solution, at various levels of concentration. The concentrated polymer solution is transferred from the central polymer facility to the well pads through pipeline distribution. Once at the well pads, the concentrated polymer solution is diluted with injection water at a specific ratio and injected into the individual wells.

Key Challenges

Technologies for Concentrated-Polymer Dissolution. The industry has only two standard technologies for dissolving polymer into water—the eductor-type units and slicing/mixing units. Conventional eductors work on the Venturi principle and allow for the mixing of the polymer powder and water up to certain concentrations. Slicing units, on the other hand, reduce the polymer particle size with a cutting head, reducing the polymer particle to a uniform size and allowing for significantly higher polymer concentrations without affecting the polymer molecular weight.

In recent years, the slicing-unit design has become more compact and capable of producing highly concentrated polymer mother solution with less sensitivity to flow variation.
The joint distribution of reference crop evapotranspiration and irrigation water in the irrigation district
Authors: Zhang Jinping , Lin Xiaomin , Zhao Yong
Published: July 2017

For the irrigation district, irrigation water is the manual water supply for the farmland while reference crop evapotranspiration (ET0) reflects water demand. Thus, the joint distribution of irrigation water and ET0 can reveal water shortage risk under the condition of the manual water supply. In order to understand their relationships and overcome the drawbacks of different marginal distributions of hydrological variables, Archimedean copulas are introduced. Based on the data series of ET0 and irrigation water in the Luhun irrigation district of China, the univariate marginal distributions of ET0 and irrigation water are first selected. Then, with the Gumbel–Hougaard copula in the Archimedean copulas, the joint distribution of ET0 and irrigation water is proposed. The results show that the best-fitting marginal distributions of ET0 and irrigation water are generalized extreme values and normal distributions, respectively, but for their joint distribution, the Gumbel–Hougaard copula is the best-fitting one. The water shortage risks with different encounter situations of ET0 and irrigation water are better revealed using the proposed copula-based joint distribution.
Finite Element Analysis of Square RC Columns Confined by Different Configurations of Transverse Reinforcement
Authors: Zeng Xiang
Published: July 2017

Introduction:

Square reinforced concrete (RC) columns with the confinement effect of transverse reinforcement perform well in ductility and have been used widely in RC structures. Its behavior is the classic topic of anti-seismic and anti-collapse analysis of RC structures. With the advancement of the finite element (FE) analysis technology, the general-purpose simulation tools such as ABAQUS and ANSYS have been universally used to analyze the behavior of structures and members, where the material constitutive model is a key problem in the analysis.

Methods:

In this study, a new uniaxial compressive stress-strain curve of the confined concrete considering confinement effect of transverse reinforcement in square RC columns was proposed for the concrete damaged plasticity model in ABAQUS to solve the problem that there is no proper uniaxial compressive stress-strain curve for the concrete damaged plasticity model to describe the behavior of concrete confined by transverse reinforcement. Based on the proposed stress-strain relationship, a FE model was developed to analyze the behaviour of laterally confined RC columns under concentric loading.

Results:

The finite element model is able to predict the response of the confined RC columns from different experiments with reasonable accuracy. Finally, a parametric study was conducted in order to evaluate the effect of confinement reinforcement configuration on the behavior of core concrete in square section.
Somos todos hussitas
Authors: Vanderlinde Tarcísio
Published: July 2017

Resenha de: DREHER, Martin Norberto. De Luder a Lutero: uma biografi a. São Leopoldo:Sinodal, 2014. 299 p. ISBN 978-85-8194-041-0.
Karl Barth – A Carta aos Romanos
Authors: Von Sinner Rudolf
Published: July 2017

Resenha de: BARTH, Karl. A Carta aos Romanos. Segunda versão (1922). Editado porCornelis van der Kooi and Katja Tolstaja. Tradução Uwe Wegner. São Leopoldo: Sinodal;EST, 2016. 576 p. ISBN 978-85-8194-075-5.
A igreja de farda: batistas e a Ditadura civil-militar
Authors: Dusilek Sérgio Ricardo Gonçalves , Da Silva Clemir Fernandes , Castro Alexandre De Carvalho
Published: July 2017

Com base em um método qualitativo exploratório-descritivo na modalidade de análise documental, procurou-se analisar, sob o prisma de Erich Auerbach, elementos históricos extraídos principalmente de documentos oficiais da Convenção Batista Brasileira (CBB), que apontam para o envolvimento da Liderança Batista com o golpe militar de 1964. Para tanto, esse trabalho utilizou três principais fontes: a) a primeira, oriunda de extensa e autorizada pesquisa nos documentos oficiais da CBB, especialmente as atas, anais e relatórios do seu Conselho; b) a segunda, vinda do semanário O Jornal Batista; c) por fim, o modelo de interpretação figural de Auerbach aplicado à recente história dos batistas no período do regime militar, especialmente no primeiro e no último quinquênio. Da conexão desses polos quinquenais pelo método de interpretação figural, pode-se notar o preenchimento e a ressignificação de tais períodos, trazendo novas luzes e permitindo afirmar que líderes batistas aderiram ao processo reacionário. Seja na mudança do redator do O Jornal Batista, principal semanário da denominação, seja no estreitamento das relações entre líderes batistas com a alta cúpula militar, ou ainda na obtenção de uma concessão de canal para TV aberta, os batistas patentearam sua fidelidade aos generais. Essa cooptação não deixou de ser paradoxal ao ideal de liberdade que está na gênese do pensamento e da forma de ser batista. Ao apoiar como liderança da CBB a ditadura civil-militar e sua repressão, os batistas traíram um de seus pilares, comutando-a e travestindo-a em uma “liberdade” religiosa.
As mulheres da Reforma na Igreja do norte da Alemanha: um olhar sob a perspectiva de gênero
Authors: Bergesch Karen
Published: July 2017

O artigo aborda o tema das mulheres da Reforma desde o século XVI até hoje, propondo uma análise de gênero. Para tanto, é apresentado inicialmente o projeto da exposição itinerante organizada pelo Departamento de Mulheres da Igreja do Norte da Alemanha. A exposição define como mulheres da Reforma aquelas que, ao darem o seu testemunho de fé, contribuíram ativamente para a promoção das ideias de uma igreja sempre em Reforma. A compreensão da Reforma como um processo contínuo extende o movimento histórico desde o século XVI até hoje. A segunda parte do artigo apresenta cinco biografiasde mulheres incluídas na exposição em forma de resumo. As biografi as narram histórias de mulheres que deram testemunho de fé de forma inovadora, marcando a história da sua região. A terceira parte do artigo realiza uma análise de gênero a partir das mudanças propostas pelo movimento da Reforma aos papéis do masculino e do feminino na sociedade no século XVI. Também são incluídas na análise as situações trazidas pelas biografias, que descrevem enfrentamentos pela liderança de comunidades e no trabalho social, bem como conquistas.
Pacioli's Lens: God, Humanism, Euclid, and the Rhetoric of Double Entry
Authors: Sangster Alan
Published: July 2017

This paper investigates why, in 1494, the Franciscan friar and teacher of mathematics, Luca Pacioli, published an instructional treatise describing the system of double entry bookkeeping. In doing so, it also explores the rhetoric and foundations of double entry through the lens of Pacioli's treatise. Recent findings on Pacioli's life and works, his writings, and the medieval accounting archives are combined to identify how he was inspired by his faith and his humanist beliefs to give all merchants access to the practical mathematics and the bookkeeping they required. The paper finds that Pacioli's teaching method was inspired by Euclid, his Franciscan education, and his humanist beliefs, and that Pacioli reveals a simplicity in the then-unrecognized axiomatic foundation of double entry that has been largely overlooked. The findings represent a paradigm shift in how we perceive Pacioli, his treatise, and double entry.
The Deferred Tax Asset Valuation Allowance and Firm Creditworthiness
Authors: Edwards Alexander
Published: July 2017

In this study, I provide evidence that the valuation allowance for deferred tax assets helps predict the future creditworthiness of a firm. Under the provisions of SFAS No. 109, a firm records a deferred tax asset provided it expects to generate sufficient taxable income to realize the asset in the form of tax savings in the future. If a firm does not expect to generate sufficient taxable income to realize the asset, then a valuation allowance is created to reduce the balance. As a result, the valuation allowance indicates management's expectation of future taxable income, which could be informative in predicting the ability of the firm to make future interest and principal payments on debt. Alternatively, the valuation allowance may not be informative regarding creditworthiness if it is a result of overly conservative accounting practices or if it is used as an earnings management tool. I document a negative association between material increases in the valuation allowance and contemporaneous and future changes in credit ratings, evidence that is consistent with the valuation allowance providing a summary measure of a decline in firms' creditworthiness.

JEL Classifications: G29; H25; M41.

Data Availability: Data are available from sources identified in the paper.
The Effect of Ingested Glucose Dose on the Suppression of Endogenous Glucose Production in Humans
Authors: Kowalski Greg M. , Moore Samantha M. , Hamley Steven , Selathurai Ahrathy , Bruce Clinton R.
Published: July 2017

Insulin clamp studies have shown that the suppressive actions of insulin on endogenous glucose production (EGP) are markedly more sensitive than for stimulating glucose disposal (Rd). However, clamp conditions do not adequately mimic postprandial physiological responses. Here, using the variable infusion dual-tracer approach, we used a threefold range of ingested glucose doses (25, 50, and 75 g) to investigate how physiological changes in plasma insulin influence EGP in healthy subjects. Remarkably, the glucose responses were similar for all doses tested, yet there was a dose-dependent increase in insulin secretion and plasma insulin levels. Nonetheless, EGP was suppressed with the same rapidity and magnitude (∼55%) across all doses. The progressive hyperinsulinemia, however, caused a dose-dependent increase in the estimated rates of Rd, which likely accounts for the lack of a dose effect on plasma glucose excursions. This suggests that after glucose ingestion, the body preferentially permits a transient and optimal degree of postprandial hyperglycemia to efficiently enhance insulin-induced changes in glucose fluxes, thereby minimizing the demand for insulin secretion. This may represent an evolutionarily conserved mechanism that not only reduces the secretory burden on β-cells but also avoids the potential negative consequences of excessive insulin release into the systemic arterial circulation.
A Type 2 Diabetes–Associated Functional Regulatory Variant in a Pancreatic Islet Enhancer at the ADCY5 Locus
Authors: Roman Tamara S. , Cannon Maren E. , Vadlamudi Swarooparani , Buchkovich Martin L. , Wolford Brooke N. , Welch Ryan P. , Morken Mario A. , Kwon Grace J. , Varshney Arushi , Kursawe Romy , Wu Ying , Jackson Anne U. ,   National Institutes of Health Intramural Sequencing Center (NISC) Comparative Sequencing Program, Erdos Michael R. , Kuusisto Johanna , Laakso Markku , Scott Laura J. , Boehnke Michael , Collins Francis S. , Parker Stephen C.J. , Stitzel Michael L. , Mohlke Karen L.
Published: July 2017

Molecular mechanisms remain unknown for most type 2 diabetes genome-wide association study identified loci. Variants associated with type 2 diabetes and fasting glucose levels reside in introns of ADCY5, a gene that encodes adenylate cyclase 5. Adenylate cyclase 5 catalyzes the production of cyclic AMP, which is a second messenger molecule involved in cell signaling and pancreatic β-cell insulin secretion. We demonstrated that type 2 diabetes risk alleles are associated with decreased ADCY5 expression in human islets and examined candidate variants for regulatory function. rs11708067 overlaps a predicted enhancer region in pancreatic islets. The type 2 diabetes risk rs11708067-A allele showed fewer H3K27ac ChIP-seq reads in human islets, lower transcriptional activity in reporter assays in rodent β-cells (rat 832/13 and mouse MIN6), and increased nuclear protein binding compared with the rs11708067-G allele. Homozygous deletion of the orthologous enhancer region in 832/13 cells resulted in a 64% reduction in expression level of Adcy5, but not adjacent gene Sec22a, and a 39% reduction in insulin secretion. Together, these data suggest that rs11708067-A risk allele contributes to type 2 diabetes by disrupting an islet enhancer, which results in reduced ADCY5 expression and impaired insulin secretion.
Prevalencia de la anemia en el embarazo y sus efectos sobre las medidas antropométricas perinatales y el apgar en el hospital gineco-obstétrico Enrique C. Sotomayor en el año 2013
Authors: Riemann Conrad , Serrano Adriana , Chedraui Peter , Salgado Gabriela , Dassum Paulina , Vásquez Diego
Published: July 2017

Introducción: la anemia es una condición muy frecuente en el embarazo a nivel mundial, la prevalencia es especialmente elevada en países en vías de desarrollo, esto podría causar problemas maternos, fetales y neonatales. Objetivo: determinar la prevalencia de anemia gestacional en el hospital Gineco-Obstétrico Enrique C. Sotomayor y conocer las características perinatales asociadas. Materiales y métodos: estudio transversal realizado en 26500 gestantes que acudieron al hospital Gineco-Obstétrico Enrique C. Sotomayor a atender su parto en el año 2013. Se obtuvo el valor de hemoglobina materna y se calculó la prevalencia de anemia (Hb <11gm/dl). De la población de mujeres anémicas, se estudiaron las características neonatales. Se relacionó el nivel de hemoglobina con las variables del recién nacido. Resultados: la prevalencia de anemia gestacional fue del 9%. De las pacientes anémicas el 100% presentaron anemia leve. El 49% de los recién nacidos fueron prematuros, un tercio presentó bajo peso, talla baja y perímetro cefálico disminuido para edad gestacional. El menor nivel de hemoglobina se correlacionó únicamente con un perímetro cefálico disminuido (valor p: 0,01) sin mostrar diferencia estadísticamente significativa con las otras variables. Conclusiones: la prevalencia de anemia gestacional en Guayaquil es alta, al igual que la carga que ésta implica. En aproximadamente un tercio de los recién nacidos se encontraría medidas antropométricas disminuidas lo que podría afectar en su desarrollo psicomotor y cognitivo en el futuro. Por consiguiente se debe valorar implementar medidas preventivas a nivel comunitario para mejorar esta situación
Electromagnetic Compatibility at the Mains Ports for Medical Equipments
Authors: Mircea Ion Buzdugan  , Emil Simion  , Horia Bălan  , Eugen Baru
Published: July 2017

The   paper   presents   the   retro   fitting   EMI   (electromagnetic  interference)  filtering  measures  applied  on  medical  equipments,  in  this  particular  case  on  the  four  cells  galvanic   bath   ATM-31,   produced   by   Datronix   Computer,   Romania,    in    the    attempt    of    achieving    electromagnetic    compatibility compliance for this product.   Due  to  the  specificity  of  medical  equipments,  EMI  mains  filtering  must  meet  more  restrictive  safety  conditions,  as  it  is  presented  in  the  paper,  making  impossible  the  use  of  ready-made typical commercial EMI filters.
Low Distortion Boost Rectifier Discontinuous Conduction Mode with Peak Current Mode Control for Wind Power Systems
Authors: O. Carranza  , E. Figueres  , G. Garcerá  , L. G. González
Published: July 2017

This  work  presents  a  Three-Phase  Boost  Rectifier with  peak  current  mode  control  operated  in  Discontinuous Conduction Mode  working  as  the  input  stage  of  wind  power systems  based  on  Permanent Magnet  Synchronous Generators with  variable  speed  operation.  It  is  shown  that  the  DCM operation  significantly  reduces  the  Total Harmonics Distortion of   the currents in   the Permanent Magnet   Synchronous Generator,  so  that  the  vibrations  and  mechanical  stress  of  the generator  is  minimized.  The  characteristics of  the  DCM  Boost rectifier  are  studied considering:  1)  The  resistance  in  series  of the  inductors;  2)  The modeling and  adjustment  of  the  current injected control yielding a stable loop; 3) The design of an input filter  that  reduces  the switching  noise in  the  currents  of  the generator.
Nonlinear regression applied for power quality disturbances characterization in grids with wind generators
Authors: M. Mahmoodi  , G. B. Gharehpetian
Published: July 2017

In  previous  researches,  the  large  signal  models  of  DC  microgrids  have  been  developed  without  using  any  time  averaging technique. Thus, the results obtained from available DC microgrid  large  signal  models  have  not  been  verified  by  results  from  their  detailed  models.  This  paper  presents  a  suitable  large  signal  model  for  DC  microgrids  which  has  the  same  response  as  control area and detailed models.
Dynamic Simulation of a Photovoltaic Installation
Authors: Ramos Hernanz, JA.  , Campayo Martín, J.J.  , Zamora Belver, I.  , Puelles Pérez, E.  , Motrico Gogeascoechea, JA.  , Sancho Sáiz, J
Published: July 2017

This paper presents the performance simulator of photovoltaic systems, developed through the software tool DigSilent PowerFactory. The study of this type of electrical generation is analyzed, modeling its capacities with advanced algorithms, from a totally flexible system and with unique concept of database. This modelling work allows an easy and fast access to the analysis and design of photovoltaic systems, which facilitates a complete vision of system’s behavior in different operation conditions. In addition, a library of models of the main alternatives that can be included in a photovoltaic conversion system has been made.
Instruments for On-line Monitoring of Transformers
Authors: V. Mentlík  , P. Prosr  , R. Polanský  , J. Michalík  , M. Brandt
Published: July 2017

The main objective of the paper is to describe the experience with newly developed monitoring system for transformers with oil-paper insulation system. From the view of operation reliability, it is necessary for operators to provide a monitoring of transformer’s failure free operation. The application of monitoring system enables to warn timely of the rising failure and also decrease of degradation of single subsystems of machine. When failure is detected, it is important to support this detection by other measurements that would lead to exact determination of the failure. SFRA analysis (Sweep Frequency Response Analysis) is such additional method in our monitoring.
Synthetic Ester-Based Oils and Their Application in Power Industry
Authors: V. Mentlík  , R. Polanský  , P. Prosr  , J. Pihera  , P. Trnka
Published: July 2017

Suitable (biodegradable) substitution of classic mineral petroleum-based oils used in power transformers is studied. Paper presents test results of six paper-oil insulation systems varying by different type of oil. Three common transformer oils and three new synthetic oils (never used in power transformers before) were selected for the purpose of experiment. The oils have been exposed to accelerated thermal aging (at the temperature of 90 °C) and their properties were measured in time intervals of 0, 50, 125, 225, 500, 1000 and 2000 hours.
Experimental Comparison of Carrier and Space Vector PWM Control Methods for Three-Phase NPC Converters
Authors: Ivo Pereira  , António Martins
Published: July 2017

Multilevel converters are powerful converters in the medium-voltage high-power range. Inside this family of converters, the three-level neutral point clamped converter has its own importance. The main control methods associated with this converter are the carrier-based PWM with added DC components and the space vector PWM. Two of the most important features of the NPC converter are the neutral point balance and the output voltage spectrum. Both control methods efficiently manage the two characteristics. This paper experimentally compares these two issues and shows that the two methods produce almost the same results; the choice between one and the other should be made according to other requirements.
The optimization of the tracking mechanism used for a group of PV panels
Authors: C. Alexandru  , C. Pozna
Published: July 2017

The paper presents researches on increasing the energetic & economic efficiency of the photovoltaic conversion by designing and optimizing a dual-axis tracking mechanism that simultaneously changes the position of the panels using two motor sources; the driving source for the daily motion is a rotary motor, while the seasonal motion is performed with a linear actuator. The main task in optimizing the tracking mechanism is to maximize the energetic gain by increasing the solar input and minimizing the energy consumption for tracking. The design strategy aims to identify the optimum angular field for the daily motion, as well as the optimum actuating time in the step-by-step motion. The study is made by developing the virtual prototype of the tracking mechanism, in the mechatronic concept.
Russell P. Sebold, Concurso y consorcio: letras ilustradas, letras románticas. Universidad, Salamanca, 2010; 270 pp.
Authors: Rincón Montiel Sergio Antonio
Published: July 2017

Se reseña el libro Concurso y consorcio: letras ilustradas, letras románticas.
Graciela Fernández Ruiz, Argumentación y lenguaje jurídico. Aplicación al análisis de una sentencia de la Suprema Corte de Justicia de la Nación. UNAM, México, 2011.
Authors: García Fajardo Josefina
Published: July 2017

Se reseño el libro: Argumentación y lenguaje jurídico. Aplicación al análisis de una sentencia de la Suprema Corte de Justicia de la Nación
Proust y la Neurociencia Una visión única de ocho artistas fundamentales de la modernidad - Jonah Lehrer. Prust and Neuroscience. A unique vision of eight fundamental artists of modernity- Jonah Lehrer
Authors: Rubbini Victoria
Published: July 2017

En Proust y la neurociencia Jonah Lehrer revela la necesidad de poner fin al secular desencuentro entre arte y ciencia. Con un tono coloquial que permite una lectura fluida, introduce al lector en los desarrollos de ocho artistas de la modernidad que se adelantaron a su época, descubriendo verdades sobre la mente humana que la ciencia en la actualidad está redescubriendo. Su objetivo es mostrar la conveniencia de que la ciencia y el arte se integren en una esfera crítica expansiva, para lo cual considera vital que exista el dialogo entre ambas culturas.
The Development Of Collision Module Based On Process Image For Physics Learning In Senior High School
Authors: Lailatul Mi’rojiyah Fajar , Sutarto Sutarto , Ketut Mahardika I , Indrawati Indrawati , Prihatin Jekti
Published: July 2017

This action research explored the development of instructional material in module form based on process image which valid, practice, and effective at physics learning in senior high school. Physics contained the concepts with the fundamental categorising something into presenting on verbal so the physics concepts are usually abstract so that mental image needed. The development of this module is one of instructional material which can help the student thinking systematic about the physics concepts so that it can learn by students independently. The module must be describing the basic competencies and it will be achieved by students and served with a good language, interesting, and completed by illustration clearly. Process Image interpreted by a series of images (objects, events, phenomenon), which every image of that series always look a different combination overall describing phase stages comprehensive.The development of module in this research is using Thiagarajan design research and development 4D (Define, Design, Develop and Disseminate) and it still at the phase Develops which the result through expert validation and action research that is a plan, action, observe, and reflection during the research. Finally, the collision module based on process image can be used in physics learning.
Fancies and Interludes (CD Review)
Authors: Tcholakova Ralitsa
Published: July 2017

[no abstract]
Claude Vivier: A Composer’s Life (Book Review)
Authors: Sallis Friedemann
Published: July 2017

[no abstract]
Music in Range: The Culture of Canadian Campus Radio (Book Review)
Authors: Van der Bliek Rob
Published: July 2017

[no abstract]
O potencial de um grupo colaborativo para a formação dos formadores de professores
Authors: Rodrigues Kátia Martins , Passos Laurizete Ferragut
Published: July 2017

Este texto se propõe a discutir dados de uma pesquisa de mestrado que investigou o potencial de um Grupo Colaborativo para a constituição do Professor Coordenador (PC) como formador de docentes. O ponto de partida para esta pesquisa foi a problemática em torno da formação continuada em serviço dos professores de Matemática, que é uma das atribuições dos PCs, porém, é considerada como a área mais complexa e difícil de ser acompanhada. Para tanto, foi constituído um grupo colaborativo com 14 Professores Coordenadores que atuam nos Anos Finais do Ensino Fundamental e no Ensino Médio, de oito escolas estaduais localizadas na Zona Leste da cidade de São Paulo (SP). Durante o período de março a novembro de 2016 foram realizados oito encontros formativos, nos quais foram estudados e discutidos aspectos da atuação dos PCs na formação em serviço dos professores de Matemática e coletados os dados para análise, como registros escritos pelos participantes e pela pesquisadora e um questionário de caracterização dos sujeitos. No processo formativo vivenciado com o grupo colaborativo, os Professores Coordenadores, especialistas e não especialistas em Matemática, apresentaram as mesmas dificuldades em relação ao trabalho desenvolvido junto aos docentes de Matemática. Evidenciou-se, assim, que a qualificação do PC deve voltar-se para sua atuação como formador da área pedagógica, independente da sua área de formação inicial e/ou especialidade dos seus professores. Este texto aborda apenas os aspectos da pesquisa que tratam dos entraves e das possibilidades em relação ao papel formador dos Professores Coordenadores e dos sentimentos revelados pelos formadores em relação à formação em serviço dos professores de Matemática, que emergiram a partir dos dados analisados.
Aprendizagem docente e colaboração de professores que ensinam matemática em projeto de extensão universitária
Authors: Fernandes Fernando Luís Pereira
Published: July 2017

Apresentamos, neste texto, alguns resultados de um projeto de extensão universitária desenvolvido no ano de 2013, junto a um grupo de professores que ensinam matemática em escolas da rede estadual da cidade de Rondonópolis, estado de Mato Grosso. Nesse projeto, inicialmente, foram apresentadas as metodologias de ensino de matemática como a Resolução de Problemas e a Investigação Matemática, além da definição do objetivo de promover uma discussão sobre as práticas de ensinar e aprender matemática, de modo a contribuir com a pesquisa da própria prática. Com a constituição de um ambiente do tipo colaborativo, os professores participantes propuseram o estudo de temáticas a partir de suas demandas. Ao final, analisamos a avaliação realizada pelos participantes do projeto, com a intenção de compreender a importância e potencialidades desse modelo de formação contínua no desenvolvimento profissional desses professores e as possíveis contribuições das metodologias estudadas.
Comunidade de Prática de formação de professores que ensinam matemática: constituição, energia e cultivo
Authors: Baldini Loreni Aparecida Ferreira , Oliveira Júlio Cézar Rodrigues de , Cyrino Márcia Cristina de Costa Trindade
Published: July 2017

Neste artigo, apresentam-se episódios da prática de um grupo de estudos, formado por professores e futuros professores que se constituiu em uma Comunidade de Prática de Formação de Professores de Matemática, com o objetivo de evidenciar aspectos dessa comunidade que proporcionaram a sua constituição, a sua energização e o seu cultivo. Para fundamentar as análises, foram utilizados os conceitos de Comunidades de Prática na perspectiva de Wenger (1998) e de Wenger, McDermott e Snyder (2002). As análises indicam que o engajamento mútuo e os empreendimentos articulados, fomentados pelas oportunidades de interação, de partilha de repertórios, de trocas de experiências e de ações planejadas pela coordenadora-formadora possibilitaram a negociação de significados e, por conseguinte, a aprendizagem docente. Fatores como a solidariedade, a criatividade e a confiança entre os membros foram essenciais para energizar e cultivar a Comunidade que se mostrou como um espaço fértil para a formação de professores