bluuebunny/crossref_metadata_2025_split huggingface dataset:
Atmospheric bending effects in GNSS tomography
Authors: Möller Gregor , Landskron Daniel 
Published: January 2019

Abstract. In Global Navigation Satellite System (GNSS) tomography, precise information about the tropospheric water vapor
distribution is derived from integral measurements like ground-based GNSS
slant wet delays (SWDs). Therefore, the functional relation between
observations and unknowns, i.e., the signal paths through the atmosphere, have
to be accurately known for each station–satellite pair involved. For GNSS
signals observed above a 15∘ elevation angle, the signal path is well
approximated by a straight line. However, since electromagnetic waves are
prone to atmospheric bending effects, this assumption is not sufficient
anymore for lower elevation angles. Thus, in the following, a mixed 2-D
piecewise linear ray-tracing approach is introduced and possible error
sources in the reconstruction of the bended signal paths are analyzed in more
detail. Especially if low elevation observations are considered, unmodeled
bending effects can introduce a systematic error of up to 10–20 ppm, on
average 1–2 ppm, into the tomography solution. Thereby, not only the
ray-tracing method but also the quality of the a priori field can have a
significant impact on the reconstructed signal paths, if not reduced by
iterative processing. In order to keep the processing time within acceptable
limits, a bending model is applied for the upper part of the neutral
atmosphere. It helps to reduce the number of processing steps by up to 85 %
without significant degradation in accuracy. Therefore, the developed
mixed ray-tracing approach allows not only for the correct treatment of low
elevation observations but is also fast and applicable for near-real-time
applications.
El pintor que escribe en un muro de papel: David Alfaro Siqueiros en la Revista Multicolor de los Sábados (1933)
Authors: Mascioto María de los Ángeles 
Published: January 2019

El artículo se centra en la participación de David Alfaro Siqueiros en la Revista Multicolor de los Sábados(Argentina). Por un lado, se estudiará la apropiación y resignificación que hace esta publicación periódica de la idea predominante en la propuesta de Siqueiros de “sacar el arte a la calle”; y por otro, se analiza el modo en que en la producción literaria del muralista mexicano, su propuesta política queda opacada por los condicionamientos de la prensa masiva.
Selección y digestión en “revistas de revistas” latinoamericanas (1930-1950)
Authors: Viu Antonia 
Published: January 2019

Este trabajo propone que las “revistas de revistas” latinoamericanas de la primera mitad del siglo XX pueden pensarse como sistemas de “digestión” en un sentido material, en tanto digestsde la prensa mundial. Este sistema de “digestión”, basado en el recorte y transposición de materiales de una revista a otra, incluye una variedad de operaciones y exige una metodología de análisis particular. En este artículo se propone una discusión teórico-crítica para pensar cómo opera dicho sistema en estas revistas y una descripción de la metodología desde la que podrían estudiarse, que luego se grafica a partir de dos ejemplos puntuales: en Babel. Revista de revistas (1939-1940), durante su época chilena editada por Enrique Espinoza, y en Ultra. Revista de revistas (1936-1947), la revista cubana dirigida por el etnógrafo Fernando Ortiz.
Algo más sobre el Meridiano editorial hispanoamericano (1927-1928)
Authors: Delgado Verónica 
Published: January 2019

El trabajo se propone revisar el contexto editorial del artículo de Guillermo de Torre “Madrid meridiano intelectual de Hispanoamérica” en conexión con las características del proyecto de La Gaceta Literariade Madrid, órgano en que se publicó en 1927. Esa revisión permite incorporar un conjunto de entrevistas realizadas por Guillermo de Torre –corresponsal en Buenos Aires del periódico español- a los editores porteños más destacados de esos años. Éstas constituyen un momento destacado, aunque menos transitado de las discusiones condensadas en aquel editorial del 1927.
Reseña. César Zamorano Díaz. Escrituras en tránsito. Revistas y redes culturales en América Latina. Editorial Cuarto Propio, 2018.
Authors: Alvarado Marina 
Published: January 2019

Reseña. César Zamorano Díaz. Escrituras en tránsito. Revistas y redes culturales en América Latina. Editorial Cuarto Propio, 2018.
Effects of the geometric shape and placing length of a fiber post on the stress distribution in a mandibular premolar tooth: A finite element analysis study
Authors: Aslan Tuğrul , Esim Emir , Kılıç Kerem , Er Özgür , Yıldırım Şahin 
Published: January 2019

Aim: The aim of this study was to evaluate the effects of two geometrically different fiber post systems and two different placing lengths on the stress distribution of endodontically treated teeth.
Methodology: Four different mandibular premolar tooth models were created. These models were restored using oval or circular fiber posts with two different placing lengths. An oblique force of 300 N was applied to the top of the tooth, and von Mises stress evaluations were carried out on the dentin tissue, luting cement, and fiber posts.
Results: The maximum von Mises stresses were observed in the 10-mm long circular fiber post model, while the minimum stresses were seen in the 5-mm long oval fiber post model. In general, the oval fiber post models presented more homogeneous stresses than the circular fiber post models. Moreover, the 10-mm long fiber post models generated greater von Mises stresses than the 5-mm long fiber post models in the dentin tissue and luting cement.
Conclusion: According to the study findings, the use of oval fiber posts at both placing lengths is suggested for oval shaped root canals due to the lower stress concentrations.
Å måle skriving som grunnleggende ferdighet
Authors: Skar Gustaf Bernhard Uno , Aasen Arne Johannes 
Published: January 2019

Denne artikkelen undersøker utviklinga av skriveprøver i Norge (i 2005 og 2009–2017). Formålet er å drøfte utfordringer forbundet med det å måle elevers skriving som grunnleggende ferdighet gjennom skriveprøver. I undersøkelsen tar vi utgangspunkt i flere av de endringene som ble gjort fra de nasjonale prøvene i skriving i 2005 til de læringsstøttende prøvene som ble utviklet fram mot 2017. Et viktig grunnlag for undersøkelsen er tekniske rapporter som ble skrevet av de gruppene som lagde prøvene. Å måle elevenes skriveferdigheter har vært faglig komplekst og kostbart. Artikkelen gjør rede for hvordan prøvene ble utviklet, hva som har kjennetegnet dem og hvilke endringer som har skjedd med dem i løpet av denne perioden, og belyser derved denne kompleksiteten. Vi redegjør for dilemmaer som følger med skriveprøveutvikling, men peker også på mulige løsninger for å ivareta god prøvekvalitet.Nøkkelord: skriveprøver, skriving, skriving som grunnleggende ferdighet, validitet, reliabilitetMeasuring writing as a key competenceAbstractThis article investigates the development of national writing tests in Norway (in 2005 and 2009–2017). The purpose of the study is to present and discuss challenges associated with the assessment of writing proficiency through standardized writing tests. The article focuses on changes that were made between the first administration of national writing tests in 2005 and the subsequent administrations following a new test design in 2009. Key sources that document this change are technical reports from the test developers. Assessing writing through national writing tests has proved to be complex, posing several challenges including numerous design choices, and has also proved to be expensive. To shed light on these complexities, this article provides information on how the tests were developed, how they can be characterized and what type of changes that were made in the period 2005–2017. The article explicates some dilemmas associated with development of writing tests, but also some viable solutions when aiming to produce high quality tests.Keywords: writing assessment, writing, writing as a key competence, validity, reliability
Vilka typer av uppgifter gynnar elever som följer kursplanen i svenska som andraspråk? En undersökning med data från de nationella proven i geografi.
Authors: Alm Fjellborg Andreas , Molin Lena 
Published: January 2019

Elever med utländsk bakgrund tenderar att prestera sämre än svenskfödda elever i skolan primärt på grund av sämre kunskaper i det svenska språket. Utifrån statistisk analys (Differential item functioning) identifieras uppgifter från de nationella proven i geografi (2014 – 2017) där elever som följer kursplanen i svenska som andraspråk klarar sig avsevärt mycket bättre - eller sämre - än förväntat. Tidigare forskning har visat att geografiska begrepp är särskilt svåra för elever som inte har svenska som modersmål, vilket också påvisas i denna studie. Den visar att det särskilt är uppgifter med lite text som handlar om geografiska begrepp som uppvisar större skillnader i prestationer mellan elever som följer kursplanen i svenska respektive svenska som andraspråk. Resultaten kan stödja såväl lärare som provkonstruktörer att bättre anpassa undervisning och prov genom att undvika att skapa uppgifter som mäter irrelevanta bakgrundsfaktorer som påverkar elevernas möjligheter att besvara uppgifter på ett adekvat vis utifrån deras kunskapsnivåer.Nyckelord: Nationella prov i geografi, uppgiftsformat, elever med utländsk bakgrund, svenskfödda elever, DIF-analysWhat types of test items benefit students who follow the syllabus in Swedish as a second language? A study using data from the Swedish national assessments in geography.AbstractPupils born outside Sweden are likely to accomplish less in comparison to native pupils, primarily as a result of inferior knowledge of the Swedish language. Based on a statistical analysis (Differential item functioning) of questions given at national tests in geography (2014-2017), it was possible to identify questions where pupils following the syllabus of Swedish as a second language attain either considerably better or more inferior results than expected. Earlier research has shown that pupils whose native language is not Swedish find it particularly hard to comprehend geographic concepts, which was confirmed by the present study. This study furthermore revealed that in particular questions containing a limited amount of text concerning geographic concepts resulted in larger differences than expected between native pupils following the syllabus in Swedish and foreign born pupils following the syllabus in Swedish as a second language. These findings could aid teachers and test constructors in their efforts to adjust teaching and tests by not formulating questions that measure irrelevant background factors, which might affect the pupils’ ability to answer questions adequately, based on their level of knowledge.Keywords: National tests in geography, question format, pupils born outside Sweden, Swedish-born pupils, DIF-analysis
Profesionales de apoyo a la inserción: formación y acompañamiento en empresas de inserción
Authors: Abiétar López Míriam , Ros-Garrido Alicia , Marhuenda Fluixá Fernando 
Published: January 2019

En el contexto actual de crisis socioeconómica y extendida precarización laboral, las empresas de inserción destacan entre las políticas activas de empleo por su potencial para luchar contra la exclusión de personas con dificultades de integración sociolaboral fomentando su empleabilidad y su calidad de vida. Este artículo analiza los procesos de formación y acompañamiento en estas empresas en el marco de la investigación “Procesos de formación, acompañamiento, cualificación y desarrollo personal en empresas de inserción: innovación en la inclusión social desde el empleo”, financiada por el Gobierno de España. Para ello, describimos el desempeño profesional del personal de acompañamiento aludiendo a las funciones que lleva a cabo el personal técnico de acompañamiento y el de producción. Nos detenemos también en las dificultades que se encuentran en el desempeño de su rol. Este análisis se fundamenta en un trabajo cualitativo de observación, entrevistas y valoración de los resultados obtenidos en términos de desempeño laboral y desarrollo personal y social realizado a lo largo de tres años en ocho empresas del territorio español. La conclusión apunta hacia las dimensiones más relevantes que inciden en el desempeño del acompañamiento y la forma en que se promueve la empleabilidad del personal en inserción.
Las cooperativas en la educación: satisfacción laboral del profesorado y diferencias de género
Authors: Martínez-León Inocencia , Olmedo-Cifuentes Isabel , Arcas-Lario Narciso , Zapata-Conesa Juan 
Published: January 2019

Las cooperativas que desarrollan su actividad en el ámbito de la educación necesitan optimizar su gestión para sobrevivir y alcanzar ventajas competitivas. Por tratarse de organizaciones intensivas en mano de obra, la satisfacción laboral de su personal es una forma de lograr esas ventajas. Por ello, esta investigación analiza, desde una perspectiva de género, cómo lograr dicha satisfacción a través de ciertas prácticas de gestión de los recursos humanos (cultura y disponibilidad de prácticas de conciliación, contratación, formación, evaluación de rendimiento y retribución). Para ello, se ha realizado un estudio empírico con la información obtenida mediante encuestas a 101 profesores/as de cooperativas de educación de la Región de Murcia.Los resultados del estudio revelan que la formación adecuada y la contratación rigurosa y formalizada son los factores más valorados para generar satisfacción laboral en el profesorado de las cooperativas de educación en la Región de Murcia. No obstante, existen claras diferencias de género, pues las profesoras valoran positivamente la disponibilidad de prácticas de conciliación, mientras que los profesores las valoran negativamente, posiblemente porque, en España, el rol de cuidado de la familia sigue recayendo mayoritariamente en las mujeres, manteniendo el hombre el rol de proveedor. Asimismo, las profesoras le dan más importancia a la contratación rigurosa y formalizada, mientras que la formación tiene mayor influencia en la satisfacción laboral de los profesores.
Tòpics retòrics dels textos hagiogràfics bizantins i catalans
Authors: Narro Ángel 
Published: January 2019

Resum: El present treball analitza comparativament els principals tòpics retòrics presents als pròlegs de textos hagiogràfics bizantins i catalans. El punt de partença és la consolidació del gènere hagiogràfic com a tal en la literatura grega tardo-antiga i d’època bizantina i la seua influència sobre el desenvolupament de l’hagiografia en Occident, primer en llatí i després en les llengües romàniques a partir de l’Edat Mitjana. En aquest sentit, podrem observar l’ús d’un mateix repertori de caràcter retòric per presentar i embellir el text i analitzarem l’explicació d’aquest fenomen i les perspectives d’estudi a explorar.

Paraules clau: hagiografia, literatura bizantina, literatura catalana, vides de sants.

Abstract: This article is aimed to compare the main rhetorical topoi of the prologues of both Byzantine and Catalan Hagiographical texts. The starting point is the consolidation of Hagiography as a literary genre in Late Antique Greek and Byzantine literature and its influence on the development of Hagiography in the West, first on Latin and then on Romance texts from the Middle Ages. In this way, we will observe the use of similar rhetorical resources to introduce and embellish the texts and analyze the explanation of this issue and the different approaches to explore.

Keywords: hagiography, byzantine literature, catalan literature, lives of saints.
Judes-Èdip en l’edat mitjana
Authors: Toldrà i Vilardell Albert 
Published: January 2019

Resum: Una llegenda medieval fon dos personatges literaris: el Judes dels evangelis i l’Èdip clàssic de la tragèdia de Sòfocles, de manera que ens trobem un Judes que, a més dels pecats que ja li coneixíem (traïció, avarícia, mentida, satanisme, suïcidi etc.), comet dues transgressions “edípiques”: el parricidi –mata el seu pare- i l’incest –es casa amb sa mare-. En aquest article fem un seguiment de la tradició textual d’aquesta fussió, del s. XII al XVI, en especial a través de les “passions” teatrals occitanes i catalanes, la Legenda aurea de Varazze i algunes referències de sant Vicent Ferrer i Francesc Eiximenis.
Paraules clau: Judes, Èdip, passions, incest, parricidi.

Abstract: A medieval legend joins two literary characters: the Judas from gospels and the classical Oedipus from the Sophocles tragedy; we find so a Judas that, in addition to the sins that we already know (treason, avarice, lie, satanism, suicide etc.), commits two “oedipical” transgressions: parricide –he kills his father- and incest –he marries his mother-. In this article we follow the textual tradition of this fussion, from XIIth century to XVIth, particularly over the occitan and catalan theatrical “passions”, the Varazze’s Legenda aurea and some references from saint Vincent Ferrier and Francesc Eiximenis.
Keywords: Judas, Oedipus, passions, incest, parricide.
Estudi de les fonts d’una Epistula de amore d’Antonio Beccadelli adreçada al valencià Francesc de Centelles (1437-1442) sobre la «vis, aut potestas» de l’amor.
Authors: Galera Hernàndez Rubén 
Published: January 2019

Resum: La política expansionista de la Corona d’Aragó vers el Mezzogiorno italià, encapçalada per Alfons el Magnànim durant la primera meitat del segle XV, va suposar que el monarca formara al seu voltant una cort d’humanistes italians perquè deixaren constància escrita de la seua empresa i transmeteren a la seua cort els coneixements dels grans autors clàssics llatins i grecs. Aquesta nòmina de lletraferits en estudis grecollatins, en què trobem Lorenzo Valla, Guiniforte Barzizza, Bartolomeo Facio i Antonio Beccadelli (el Panormita), entre d’altres, mantingueren assíduament contacte amb membres de la cancelleria reial i de la noblesa. Un d’aquests nobles va ser el cavaller valencià, camarlenc, conseller i mariscal, Francesc-Gilabert de Centelles i Queralt, altrament dit Ramon de Riu-sec, senyor de Nules i comte d’Oliva (1449), qui va mantenir correspondència epistolar amb Barzizza i Beccadelli, per demanar-los consell sobre la naturalesa de l’amor. En aquest article, doncs, hem estudiat les fonts de consulta a què va recórrer el Panormita quan va redactar l’epístola i el contextualitzem amb la realitat amorosa del cavaller valencià.
Paraules clau: segle XV, Itàlia, Corona d’Aragó, Antonio Beccadelli, Francesc-Gilabert de Centelles.

Abstract: The expansionist policy of the Crown of Aragon towards the Italian Mezzogiorno, headed by Alfons el Magnànim during the first half of the fifteenth century, supposed that the monarch would form around him a court of Italian humanists for the written testimony of his enterprise and the transmition to the court of the knowledge of the great Latin and Greek classical authors. This list of letters written in Greco-Latin studies, in which we find Lorenzo Valla, Guiniforte Barzizza, Bartolomeo Facio and Antonio Beccadelli (Panormita), among others, were always in contact with members of the Royal Chancery and the nobility. One of these nobles was the Valencian knight, chamberlain, counselor and marshal, Francesc-Gilabert de Centelles i Queralt, otherwise known as Ramon de Riu-sec, lord of Nules and Count of Oliva (1449), who corresponded with Barzizza and Beccadelli, to ask for advice about the nature of love. In this article, we have studied the sources of reference that Panormita consulted when writing the epistle and we contextualize it with the loving reality of the Valencian knight.
Keywords: 15th century, Italy, Crown of Aragon, Antonio Beccadelli, Francesc-Gilabert de Centelles.
Highly Sensitive, Low Voltage Operation, and Low Power Consumption Resistive Strain Sensors Based on Vertically Oriented Graphene Nanosheets
Authors: Jiang Qianqing , Tang Chengchun , Wang Huaping , Yang Jie , Li Junjie , Gu Changzhi , Yu Gui 
Published: January 2019

AbstractFlexible and stretchable electronics are essential module of mobile wearable devices, soft human–machine interfaces, and also e‐skin on biomedical prostheses and biorobotics. Strain sensors, as one of the major part of flexible electronics, have been extensively studied recently. When being used for mobile and long‐term applications, low power consumption and low operation voltage beside high sensitivity and fast response of the sensors are required. Easy integration is also an important aspect to build an internet of things. Here, resistive strain sensors with a maximum gauge factor of 150, a fast response time of about 10 ms, a low operation voltage of 20 mV, and a low power consumption of <8 µW, are demonstrated by introducing easily patternable vertically oriented graphene nanosheets (VGs film) as the sensing material. Ultrasmall strain of 0.07% can be detected with VGs film patterned into 200 µm × 200 µm square array. It is the special structure of the VGs film with a combination of an underlying buffer layer and vertically oriented nanosheets upon it that ensures both the high sensitivity and the low power consumption. To demonstrate the capacities of the sensor, the sensor was applied to monitor the human artery pulses.
Universal Scaling Law for Methane Capture Quantity in Metal–Organic Frameworks
Authors: Lin Haoxiang , Cai Shuhong , Zhu Xi 
Published: January 2019

AbstractIn this work, a universal scaling law for the methane gas capture quantity in metal–organic frameworks (MOFs) structure is provided. The methane–MOF adsorption events are catalogued into energy and space scenario individually. The energy factor includes three types of energy forces for both bonding and non‐bonding interactions in variant type of MOFs structures: that is, 1) metal–gas interactions, 2) heteroatom–gas bonds, and 3) non‐bonding interactions, including Van der Waals as well as Coulomb interactions. The subspace factor includes: 1) geometrical void fraction volume, 2) surface area, and 3) the limiting local pore size. Under this catalogue, more than 65 000 types of MOFs with relative high gas capture are studied; a linear scaling law can be approached via the group combination of the energy and space factor. Moreover, the decomposed scaling law indicates that for the exploring of high gas storage MOFs structure, the design of spatial geometry takes more importance than the chemical bonding of gas–MOFs interactions. The linear scaling works for other gases, like nitrogen and carbon dioxide as well. This work provides a qualitative understanding for the design of MOFs materials for the gas capture utility.
Efficient Bifunctional Polyalcohol Oxidation and Oxygen Reduction Electrocatalysts Enabled by Ultrathin PtPdM (M = Ni, Fe, Co) Nanosheets
Authors: Lai Jianping , Lin Fei , Tang Yonghua , Zhou Peng , Chao Yuguang , Zhang Yelong , Guo Shaojun 
Published: January 2019

AbstractDespite intense research in past decades, the development of high‐performance bifunctional catalysts for direct ethylene glycol or glycerol oxidation reaction (EGOR or GOR) and oxygen reduction reaction (ORR) remains a grand challenge in realizing fuel‐cell technologies for portable electronic devices and fuel‐cell vehicle applications. Here, a general method is reported for controllable synthesis of a class of ultrathin multimetallic PtPdM (M = Ni, Fe, Co) nanosheets (NSs) with a thickness of only 1.4 nm by coreduction of metal precursors in the presence of CO and oleylamine. With the optimized composition and components, ultrathin Pt32Pd48Ni20 NSs exhibit the highest electrocatalytic activity for EGOR, GOR, and ORR among all different ultrathin PtPdM NSs, ultrathin PtPd NSs, and the commercial catalysts. The mass activities of ultrathin Pt32Pd48Ni20 NSs for EGOR, GOR, and ORR are 7.7, 5.4, and 7.7 times higher respectively than a commercial catalyst, and they are the most efficient nanocatalysts ever reported for EGOR/GOR. The ultrathin PtPdNi NSs are also very stable for EGOR/GOR/ORR. It is further demonstrated that these ultrathin multimetallic NSs can be readily generalized to other sensor‐related electrocatalysis system such as high‐sensitivity electrochemical detection of H2O2.