bluuebunny/crossref_metadata_2025 huggingface dataset:
A preliminary study investigating functional movement screen test scores in female collegiate age horse-riders
Authors: Lewis V. , Douglas J.L. , Edwards T. , Dumbell L.
Published: April 2019

The functional movement screen (FMS) is an easily administered and non-invasive tool to identify areas of weakness and asymmetry during specific exercises. FMS is a common method of athlete screening in many sports and is used to ascertain injury risk, but has to be used within an equestrian population. The aim of this study was to establish FMS scores for female collegiate age (18-26 years) riders, to inform a normative data set of FMS scores in horse riders in the future. Thirteen female collegiate horse riders (mean ± standard deviation (sd); age 21.5±1.4 years, height 167.2±5.76 cm, mass 60.69±5.3 kg) and 13 female collegiate non-riders (mean ± sd; age 22.5±2.1 years, height 166.5±5.7 cm, mass 61.5±4.9 kg) were assessed based on their performance on a 7-point FMS (deep squat, hurdle step, in-line lunge, shoulder mobility, active straight leg raise, trunk stability and rotary stability). The mean composite FMS scores (± sd) for the rider group was 14.15±1.9 and for the non-riders was 13.15±1.77. There was no statistically significant difference in median FMS composite scores between the rider and non-rider groups (Mann-Whitney U test, z=-1.249,
P
=0.223). However, 46% of riders and 69% of non-riders scored ≤14, indicating that a non-rider is 1.5 times (odds ratio) more likely to be at increased risk of injury compared to riders. Collegiate female riders scored higher than the non-rider population, but lower than seen in other sports suggesting some riders may be at risk of injury. Riders’ FMS scores demonstrated asymmetric movement patterns potentially limiting left lateral movement. Asymmetry has a potential impact on equestrian performance, limiting riders’ ability to apply the correct cues to the horse. The findings of such screening could inform the development of axillary training programmes to correct asymmetry pattern and target injury prevention.
Correlation of competition performance with heart rate and blood lactate response during interval training sessions in eventing horses
Authors: Kirsch K. , Düe M. , Holzhausen H. , Sandersen C.
Published: April 2019

Objective performance monitoring in eventing horses is rare as the implementation of standardised exercise tests is commonly perceived to interfere with the daily training routine. The validity of performance parameters derived from GPS data, heart rate (HR) and post exercise blood lactate concentration (LAC) measured during usual training sessions should therefore be evaluated. Velocity (V), HR and post exercise LAC recorded during 172 interval training sessions in 30 horses were retrospectively analysed. Linear regression of HR, averaged over retrospectively defined speed ranges, was used to calculate the V at HRs of 150 (V150) and 200 (V200) beats/min. A single exponential regression model, fitted to LAC in relation to HR values from the whole group of horses, was used to predict LAC for each horse’s individual HR value and to calculate the difference between measured and predicted LAC (LACdiff). Recovery HRs were derived from bi-exponential regression of HR decrease after exercise. Results were compared between different stages of training in the same horses and between horses categorised as superior (SP) and average performer (AP) according to their competition performance. V150 and V200 significantly increased with progressing training. SP had higher V150 and V200 values, lower LACdiff values and lower HRs after 1 min of recovery (HRR60s) than AP. Competition performance was positively correlated to V150 and V200 but negatively correlated to LACdiff and HRR60s. Regular monitoring of HR and LAC in response to interval training provided valuable indicators of performance. The results of this study may contribute to an increased applicability of routine performance monitoring in eventing horses.
Movilizaciones por la red. Las evoluciones del movimiento open
Authors: Ariño Villarroya Antonio
Published: April 2019

El movimiento open es el conjunto de luchas protagonizadas por individuos, foros, organizaciones e instituciones de muy diverso tipo que postulan una visión abierta, inclusiva y participativa de internet y de los bienes digitales. Consta de seis ramas fundamentales en función del campo sobre el que operan: el software, la comunicación científica, los materiales educativos, la creación cultural, la producción maker y la neutralidad de la red. Este artículo ofrece una visión sintética del movimiento, de sus características y aportaciones fundamentales.
The rise of crowdfunding in the cultural field. A new architecture for shared production or simply a reformulation of fragility and precariousness?
Authors: Barbieri Nicolás , Fina Xavier , Partal Adriana , Subirats Joan
Published: April 2019

Crowdfunding experiences, especially in the cultural field, have expanded in an unthinkable manner in the last few years. This phenomenon is linked to the major transformation of the Internet in many aspects of social, economic and political activity. Together with private and commercial production, new spaces for production and social exchange have been created. However, it is crucial to verify the degree to which these new spaces of technical and economic feasibility find the right results in social return and its practices. Does the rise in crowdfunding in the cultural field represent a new-shared production or is it merely a fragile and precarious reformulation of the sector? By analysing the activities of several crowdfunding platforms this article answers these questions and proposes four dimensions to study the social return and public value of crowdfunding. We conclude that crowdfunding not only incorporates innovation to the well-established intermediary dynamics of the cultural sector, but can also reproduce the institutional rules and status quo.
Flamenco y derechos de autor. El caso de Camarón de la Isla
Authors: Heredia-Carroza Jesús , Palma Martos Luis , Aguado Luis F.
Published: April 2019

En el artículo, utilizando elementos conceptuales de derecho comparado (originalidad) y de economía de la cultura (valor cultural), se expone que la contribución realizada por el intérprete a la obra flamenca no cuenta con una protección acorde con su importancia. La metodología utilizada incluye entrevistas a personalidades del flamenco, que permitieron determinar la estructura de la obra musical flamenca y el diseño de su proceso de creación. Posteriormente, a partir de encuestas, se obtiene una aproximación a la valoración cultural de los agentes que dan lugar a la obra: palo (acervo cultural), autor e intérprete. Conmemorando el 25 aniversario de su muerte, se presenta un caso representativo de la problemática tratada, protagonizado por Camarón de la Isla. En este sentido el trabajo contribuye al estudio de la valoración del intérprete como parte fundamental de la obra musical flamenca y, por tanto, sustenta la demanda de una protección por derechos de autor.
Los peligros de la sobrestimulación en la metrópolis moderna: Georg Simmel y su lectura del nuevo urbanita
Authors: Hernández Barbosa Sonsoles
Published: April 2019

A finales del siglo XIX, la economía capitalista y las nuevas formas de consumo que trae implícitas tratando de seducir al individuo urbano con multitud de estímulos suponen un cambio en el modo en que este experimenta la ciudad. Esto conlleva la aparición de nuevas patologías, como la neurastenia, producto de un supuesto exceso de demanda del cerebro. Estos efectos fueron abordados en la época por Georg Simmel, quien se interesó por la reacción que sobre el individuo produce la urbe capitalista ligada a la “intensificación de la vida nerviosa”. En el presente artículo se indaga en la lectura que Simmel plantea de los efectos que la ciudad moderna ejerce en el ciudadano. Me centro particularmente en la cuestión de la saturación de estímulos para tratar de entender no solo cómo creía que la ciudad afectaba al ciudadano en la época sino también el novedoso papel que otorga a la sensibilidad como intermediaria del vínculo entre individuo y ciudad.
Effects Wall Properties on Peristaltic Transport of Rabinowitsch Fluid through an Inclined Non-Uniform Slippery Tube
Authors: Manjunatha Gudekote , Rajashekhar Choudhari , Vaidya Hanumesh , Prasad K.V. , Makinde Oluwole Daniel
Published: April 2019

The effects of slip and wall properties on the peristaltic mechanism of Rabinowitsch fluid flowing through a non-uniform inclined tube is investigated under the assumptions of long wavelength and small Reynold’s number. The governing equations of motion, momentum, and energy are rendered dimensionless by using suitable similarity transformations. The effects of the velocity slip parameter , thermal slip parameter, wall rigidity parameter, wall stiffness parameter and the viscous damping force parameter on velocity, temperature and streamlines are analyzed for shear thinning, viscous, and shear thickening fluid models. From the results, it is found that an increase in the value of velocity and thermal slip parameter enhances the velocity and temperature profiles for viscous and shear thinning fluids. Also, the volume of trapped bolus improves for an increase in the value of rigidity and stiffness parameter for all the three liquids, whereas it decreases for an increase in the value of the viscous damping force parameter.
Numerical Study of Temperature Distributions and Solidification Pattern in the Weld Pool of Arc Welded Plate
Authors: Yadav Anshul , Kumar Anil , Gupta Priya , Sinha Devendra Kumar
Published: April 2019

The study on heat flow in welding is essential as the quality of the weld depends on mainly heat flow through the welded plate. The heat input from welding source flows in a limited zone, and it subsequently flows into the workpiece by conduction. In this study, an attempt is taken to predict the transient temperature distribution and solidification pattern through a numerical model and the associated mathematical technique considering the solidification and heat transfer, of molten weld pool when it is covered with flux and without flux in arc welding process. The numerical model developed in this study solves fluid flow and heat transfer considering solidification and melting phase change the along with natural convection in the meltpool. It was found that the flux is functioning as insulation on the welded pool, hence it restricts rapid solidification and increases the mushy zone width.
Effect of Hydrogen on the Structure, Magnetic and Magnetocaloric Properties of Laves Phase Type-Compounds RE(Fe0.25Co0.75)2Hy with RE = Ho and Er, y = 0.0, 3.0, 3.5
Authors: Chaaba Ichrak , Othmani Safa , Haj-Khlifa Sonia , de Rango Patricia , Fruchart Daniel
Published: April 2019

The crystal structure and overall magnetic properties of RE(Fe0.25Co0.75)2Hywith RE = Ho and Er, were analyzed versus y, the hydrogen content. The single phase C15 type compounds, synthesized using cold crucible HF melting, were hydrogenated and controlled using a PCI apparatus. The impact of hydrogen insertion on the cell parameter, the Curie temperature TCand the magnetization saturation were determined. All compounds and hydrides were found to be ferrimagnets, the magnetic moment of RE and 3d elements being opposite since Ho and Er belong to the 2ndrow of rare earth elements. Depending on the formula, a typical compensation point was in evidence. The 2ndorder character of the ferri ↔ paramagnetic transition was established using the Arrott plot method. Magnetization isotherms vs. magnetic field gives quantified results for the magnetic entropy variation by application of the Maxwell relation. Control of y, the hydrogen content, shows it is interesting for improvement of the MCE of the starting compounds. However increasing y leads to decreased TCat the lowest temperatures, suggesting potential cryogenic uses.
Structure and Magnetic Properties of (Cr,Ni)4-xCoxSi
Authors: Martyniak Romana Iryna , Muts Nataliya , Sichevych Olga , Borrmann Horst , Bobnar Matej , Akselrud Lev , Gladyshevskii Roman E.
Published: April 2019

The crystal structure of the (Cr,Ni)4Si phase with and without Co was refined from X-ray powder diffraction data. The compound crystallises with an Au4Al-type structure (Pearson symbol cP20, space group P213): unit-cell parameter a = 0.611959(6) nm for the composition (Cr0.312Ni0.688)4Si, a = 0.612094(6) nm for (Cr0.375Ni0.625)4Si, and a = 0.612316(6) nm for (Cr0.337Co0.063Ni0.600)4Si. The magnetic susceptibility was measured in external fields up to 7 T at temperatures between 1.8 and 400 K. The three investigated samples exhibited paramagnetic behaviour described by the modified Curie-Weiss law: χ0 = 146∙10-6 emu g-at.-1, μeff = 0.21 μB/atom, θP = -13 K for (Cr0.312Ni0.688)4Si; χ0 = 158∙10-6 emu g-at.-1, μeff = 0.20 μB/atom, θP = -15 K for (Cr0.375Ni0.625)4Si; χ0 = 169∙10-6 emu g-at.-1, μeff = 0.18 μB/atom, θP = -52 K for (Cr0.337Co0.063Ni0.600)4Si.
Interaction of the Components in the {Ce, Gd}-{Ti, Zr}-Sb Systems
Authors: Senchuk Oleksandr , Gladyshevskii Roman E.
Published: April 2019

The phase equilibria in the ternary systems {Ce, Gd}–{Ti, Zr}–Sb were investigated by means of X-ray powder diffraction and energy-dispersive X-ray spectroscopy. The isothermal sections of the phase diagrams at 600°C were constructed. The formation of three ternary compounds (Ce2Ti7Sb12, Ce3TiSb5, and Gd2Ti11Sb14) was confirmed in the {Ce, Gd}–Ti–Sb systems and no more ternaries were found. The investigation of the {Ce, Gd}–Zr–Sb systems revealed several new ternary compounds and confirmed the known ones. The crystal structure of the new compound Ce0.08(3)Zr1.92(3)Sb was determined from X-ray powder diffraction data. The other new compounds in the Ce–Zr–Sb system were found to have compositions close to ~CeZrSb4and ~Ce2Zr3Sb5. In the Gd–Zr–Sb system the existence of a large homogeneity range was established for the GdZrSb compound along the isoconcentrate 33.3 at.% Sb: Gd1-xZr1+xSb (x= 00.905(18) at 600°C), and a new compound, ~Gd3Zr3Sb14, was discovered. The crystal structures at the boundary compositions of the Gd1-xZr1+xSb phase were refined from X-ray powder diffraction data.
Crystal Structure of the Compounds DyGa3-xGex (x = 0.08-0.48 and x = 0.68-0.80)
Authors: Delenko Taras , Horyn Andriy , Tokaychuk Yaroslav O. , Gladyshevskii Roman E.
Published: April 2019

The crystal structure of the binary compound DyGa3 at 600°C belongs to the structure type Ta (Rh0.33Pd0.67)3 (Pearson symbol hP40, space group P63/mmc: a = 6.1617(3), c = 23.0365(18) Å). Progressive substitution of Ge atoms for Ga atoms in DyGa3 at 600°C led to the formation of two ternary compounds: DyGa2.92-2.52Ge0.08-0.48 (structure type Mg3In, hR48, R3m, a = 6.1707(3)-6.22374(10), c = 27.7297(15)-28.1185(5) Å) and DyGa2.32-2.20Ge0.68-0.80 (PuAl3, hP24, P63/mmc, a = 6.0970(3)-6.1091(6), c = 14.3153(8)-14.3528(14) Å). Both structure types belong to the family of close-packed structures, and the increase of the Ge content in the system DyGa3-xGex is accompanied by a decrease of the hexagonality of the close-packing. Both ternary compounds exhibit metallic type of electrical conductivity.
Crystal Growth and some Properties of Tm(Al1-xMox)B4 Synthesized by Al-Flux
Authors: Okada Shigeru , Kouzu Kaoru , Yamasaki Takashi , Mori Takao , Guo Quan Sheng , Shishido Toetsu , Yubuta Kunio , Rogl Gerda , Rogl Peter
Published: April 2019

Crystals of the solid solution Tm(Al1-xMox)B4(x = 0.002 - 0.050) were grown from Tm2O3, metal Mo and crystalline boron powders as starting materials under an Ar atmosphere at 1773 K for 5 h. Tm(Al1-xMox)B4crystals were obtained as a single phase in the case of Al1-xMoxflux (x = 0.005 and 0.010). Tm(Al1-xMox)B4crystals at a maximum size of about 2.2 mm were obtained in the shape of a flake, and together with needle-like crystals of MoAlB and an unknown phase using Al0.970Mo0.030flux. The lattice constants of Tm(Al1-xMox)B4(x = 0.005 - 0.010) crystals were determined to be larger compared to those obtained for TmAlB4. This is related to the fact that the ionic radius of Mo is larger than the ionic radius of Al. When the Al position in the TmAlB4structure was substituted with Mo having a large ionic radius, the hardness hardly changed. In contrast to TmAlB4, no antiferromagnetic transition could be observed for Tm(Al0.995Mo0.005)B4, indicating that the disorder introduced by Mo-doping disrupted the magnetic transition.
Cutting Edge: Lymphomyeloid-Primed Progenitor Cell Fates Are Controlled by the Transcription Factor Tal1
Authors: de Pooter Renée F. , Dias Sheila , Chowdhury Munmun , Bartom Elisabeth T. , Okoreeh Michael K. , Sigvardsson Mikael , Kee Barbara L.
Published: April 2019

Lymphoid specification is the process by which hematopoietic stem cells (HSCs) and their progeny become restricted to differentiation through the lymphoid lineages. The basic helix-loop-helix transcription factors E2A and Lyl1 form a complex that promotes lymphoid specification. In this study, we demonstrate that Tal1, a Lyl1-related basic helix-loop-helix transcription factor that promotes T acute lymphoblastic leukemia and is required for HSC specification, erythropoiesis, and megakaryopoiesis, is a negative regulator of murine lymphoid specification. We demonstrate that Tal1 limits the expression of multiple E2A target genes in HSCs and controls the balance of myeloid versus T lymphocyte differentiation potential in lymphomyeloid-primed progenitors. Our data provide insight into the mechanisms controlling lymphocyte specification and may reveal a basis for the unique functions of Tal1 and Lyl1 in T acute lymphoblastic leukemia.
Helicopter Fuselage Model Drag Reduction by Active Flow Control Systems
Authors: De Gregorio Fabrizio
Published: April 2019

A comprehensive experimental investigation of a helicopter blunt fuselage model was carried out to evaluate the effectiveness of active flow control (AFC) systems in reducing parasite fuselage drag. The main objective was to demonstrate the capability of different active technologies
to decrease fuselage drag by alleviating the flow separation in the loading ramp region of large transport helicopters. The work was performed on a simplified blunt fuselage at model scale. Two different flow control actuators were considered for evaluation: steady blowing and unsteady blowing
(i. e., pulsed jets). Laboratory tests of each individual actuator were performed to assess their performance and properties. The fuselage model was investigated with and without the AFC systems located along the loading ramp edges. Significant drag reductions were achieved for a wide range
of fuselage angles of attack and sideslip angles without negatively affecting other aerodynamic characteristics.
Measurement of the perceptions of human resource practices in a seemingly collectivistic culture
Authors: Grobler Anton , Grobler Sonja , Mathafena Rose
Published: April 2019

Orientation: Human resources (HR) practices and specifically the perceptions thereof are not only important for organisational strategy and performance but have a direct impact on employee attitudes and behaviour. The accurate measurement of these perceptions is therefore important.Research purpose: The goal of this study was to validate the Human Resource Practices Perceptions Questionnaire for the South African context (which is unique in terms of its apparent collectivistic nature), from an etic perspective.Motivation for the study: The accurate measurement of employees’ perception of HR practices are essential to give the organisation a competitive advantage. This study was done to validate a HR practices perceptions questionnaire in a seemingly collectivistic context.Research approach/design and method: This study is based on a cross-sectional survey design, collecting primary data on the perceptions of HR practices from 1676 South African employees in public and private sector organisations. An exploratory (EFA) and confirmatory factor analysis (CFA) were conducted.Main findings: The EFA and CFA yielded a slightly different permutation compared to the initial factor structure. A nine-factor structure was extracted and confirmed. A slight adjustment of the original questionnaire was required to incorporate performance evaluation with a teamwork focus and to differentiate training from development. It was further found that invariance exists when comparing the private and the public sectors.Practical/managerial implications: It was found that the instrument had to be adjusted for the South African context to ensure an accurate measurement of employees’ perceptions of HR practices.Contribution/value-add: The instrument has been validated and can thus be used with confidence to assess the perceptions of HR practices regardless of the sector. It thus provides an accurate measurement that can be used to predict or explain other employee behavioural outcomes in relation to their perceptions of the HR practices.
On Differential Torsion Theories and Rings with Several Objects
Authors: Banerjee Abhishek
Published: April 2019

Let${\mathcal{R}}$be a small preadditive category, viewed as a “ring with several objects.” A right${\mathcal{R}}$-module is an additive functor from${\mathcal{R}}^{\text{op}}$to the category$Ab$of abelian groups. We show that every hereditary torsion theory on the category$({\mathcal{R}}^{\text{op}},Ab)$of right${\mathcal{R}}$-modules must be differential.
Del dibujo a mano alzada a los SIG: representación y caracterización gráfica del campus de la Universidad de Navarra
Authors: Selva-Royo Juan Ramón
Published: April 2019

El nacimiento de la Universidad de Navarra está íntimamente relacionado con la imagen gráfica de su proyecto espacial. Asumiendo que el dibujo de arquitectura posee una fuerte instrumentalidad emotiva, se analiza a continuación la influencia que tuvieron las diferentes formas de expresión gráfica de este recinto universitario en sus primeros años, bajo la hipótesis de que todas ellas jugaron un decisivo papel en la proyección de su imaginario. No se trata, pues, de abordar la representación de sus edificios actuales, sino más bien de estudiar la construcción de una idea de universidad mediante el dibujo, en paralelo al lento proceso de consolidación institucional. Una vez definido el ámbito físico del campus, el presente trabajo se centra en las estrategias de caracterización gráfica contemporánea. Los SIG, las nubes de puntos y las técnicas de fotogrametría permiten así visualizar esta narrativa histórica y cuantificar la aportación del recinto a su entorno urbano.

 
Vista aérea y ruina. Representaciones pre-fotográficas de la destrucción desde el aire
Authors: Caralt Robles David
Published: April 2019

El artículo argumenta la relación entre vista aérea y representación de la catástrofe antes de la llegada de la fotografía aérea militar en la era aerodinámica. Repasa primero brevemente la literatura utópica que, en los siglos xvii y xviii, fantasea con la posibilidad de volar y advierte del potencial destructivo de la visión desde el aire. Destaca que la conquista del cielo iniciada con el globo aerostático fue representada con la visión sombría de un globo-ojo como seria advertencia del peligro venidero. Explica una serie de representaciones de la destrucción, consumada o en proceso, en documentos antiguos que se sirven de la vista aérea y anticipan las fotografías desde el avión que registran la devastación de las guerras del siglo xx. Mantiene, en fin, que el dominio visual desde arriba convierte la vista aérea en la posición privilegiada desde donde representar la destrucción de la arquitectura y la ciudad.
DesBIOS 3.0. Los proceso de rendering en la transformación del imaginario colectivo
Authors: Solana Suárez Enrique , Gutiérrez Labory Elsa
Published: April 2019

La utilización del render como simulador de realidad y transformador del imaginario arquitectónico es el asunto que pretendemos desarrollar en el contexto del cambio de paradigma gráfico de la representación arquitectónica actual. Jugamos con las palabras, la BIOS, Basic Input / Output System (Sistema Básico de entrada y salida), y conjugamos el acrónimo del nombre de un conocido sistema operativo (OS), que definimos en su versión tercera (3.0) existiendo dos versiones anteriores (1.0 y 2.0). La fonética DesBIOS acerca la palabra “desvío” que significa un cambio de vía, de ruta, que es lo producido. Ha existido un desplazamiento del uso del render, construyendo un encadenado de transformación, esto constituye las diferentes versiones que pasamos a explicar: DesBIOS 1.0. IMITACIÓN Operaciones digitales de render para producir simulación de materiales. DesBIOS 2.0. FABRICACIÓN Render desencadena producción de nuevos materiales de apariencia digital. DesBIOS 3.0. ESPACIALIDAD La utilización de elementos con apariencia digital, transforma la imagen espacial en aspecto digital. El sector profesional asume tales cambios, propiciando la creación de nuevos materiales por la industria de la construcción a través del diseño arquitectónico, avanzando así hacia la obtención de apariencias emuladoras de la representación digital en la configuración la construcción de los espacios.
Consideraciones en torno a la representación de lo invisible: el método de Monge en cuatro dimensiones
Authors: Martín Pastor Andrés , Gentil Baldrich Jose Mª
Published: April 2019

La representación gráfica del espacio tetradimensional, entre el siglo xix y xx, merece un lugar destacado en la historia del pensamiento gráfico. Al igual que ocurrió en el desarrollo de la perspectiva renacentista, el estudio de los poliedros –y politopos– por unos pocos “matemáticos de la representación” fue unido a la codificación de novedosas formas de representar. La voluntad de definir nuevas formas de ver y representar la cuarta dimensión trascendió a todas las esferas de las manifestaciones estéticas. Aportaremos relevantes testimonios sobre la evolución de estos primeros sistemas gráficos tetradimensionales. Una última contribución se recoge en la Tesis de Alfredo Llorens Herrero 1, que supone la ampliación del Sistema Diédrico en una dimensión extra. 
Los dibujos inéditos de José Gómez de Navia para la colección de vistas del Monasterio del Escorial, y los grabados de la calcografía real
Authors: Chías Navarro Pilar , Navarro Esteve Pablo
Published: April 2019

Entre la importante producción de la efímera Calcografía Real existe una magnífica serie de doce grabados que representan vistas exteriores e interiores del Monasterio de El Escorial. Los dibujos que sirvieron para hacer las planchas fueron realizados por José Gómez de Navia y hasta ahora se consideraban perdidos. Sin embargo, diez de ellos firmados se encuentran en una colección particular en Valencia, siendo esta la primera vez que se publican y estudian. En estos dibujos se aprecia la gran delicadeza y la técnica pulcra y detallada, casi de miniaturista, de su autor. El hallazgo nos ha permitido comparar los originales y los grabados –en particular la serie que custodia la Biblioteca Nacional de España–, y comprobar los cambios introducidos por el buril, y también destacar la importancia que la serie calcográfica tuvo en la evolución de la iconografía del Monasterio.
A method for measuring detailed demand for workers’ competences
Authors: Pater Robert , Szkola Jaroslaw , Kozak Marcin
Published: April 2019

There is an increasing need for analysing the demand for skills in the labour market. While most studies aggregate skills in groups or use available proxies for them, the authors analyse the demand by employers for individual competences. Such an analysis better reflects reality because companies usually require job candidates to have particular competences, rather than generally defined groups of skills. However, no method exists to analyse on a large scale which competences are required by employers. At a detailed level, there are hundreds of competences; thus, this demand cannot be measured in a sample survey. The authors propose a method for conducting a continuous and efficient analysis of the demand for competences of prospective employees. The method involves collecting online job offers and analysing them with data mining and text analysis tools. The authors use this method to analyse transversal competences in the Polish labour market. Their findings indicate that companies typically required only certain competences—especially ‘language and communication competences’—while neglecting others. The number of job candidate requirements was counter-cyclical. However, the structure of the competences demanded did not change during the analysed period.
Evaluation of Techniques for Determination of Hydroxyl Value in Materials for Different Industrial Applications
Authors: Jesus Laís Lopes , Murakami Lídia Mattos Silva , Mello Talita de Souza Dias , Diniz Milton Faria , Silva Leandro Mattos , Mattos Elizabeth da Costa , Dutra Rita de Cássia Lazzarini
Published: April 2019

When some materials need to be characterized, the hydroxyl number (IOH) determination is especially useful, mainly for those applied in the aerospace field. Usually, this characterization is performed by wet chemistry, using methodologies involving several steps, such as derivatization. This is a time-consuming and costly step. On the other hand, when the analysis is performed by Fourier transform infrared (FT-IR) spectroscopy, the most used region is the medium infrared (MIR) and transmission techniques are usually employed. However, FT-IR methodology developed error is usually not discussed. FT-IR methodology was developed in near infrared (NIR) and MIR regions, including non-conventional techniques, such as universal attenuated total reflection (UATR) and transflectance (near infrared reflection accessory [NIRA]), and transmission, to determine IOH in surfactants, used in aerospace catalysts/cosmetic products, and polyesters, applied in paints. According to the samples’ characteristics, surfactants were analyzed by transmission/solution and, as received, by NIRA. Polyesters were analyzed by UATR and NIRA, as received. The IOH values for all samples were also measured by wet chemistry and/or potentiometry (supplier’s data) and used as reference. Good linear correlations were observed between 0.939 and 0.976, being considered with good precision, and between 88% (NIRA) and 98% (MIR) of the results were explained by developed methodologies.
Multi-scale measurements of mesospheric aerosols and electrons during the MAXIDUSTY campaign
Authors: Antonsen Tarjei , Havnes Ove , Spicher Andres
Published: April 2019

Abstract. We present in situ measurements of small-scale fluctuations in aerosol
populations as recorded through a mesospheric cloud system from the Faraday
cups DUSTY and MUDD during on the MAXIDUSTY-1 and 1B sounding rocket payloads
launched in the summer of 2016. Two mechanically identical DUSTY probes
mounted with an inter-spacing of ∼10 cm recorded very different
currents, with strong spin modulation, in certain regions of the cloud
system. A comparison to auxiliary measurement show similar tendencies in the
MUDD data. Fluctuations in the electron density are found to be generally
anti-correlated to the negative aerosol charge density on all length scales;
however, in certain smaller regions the correlation turns positive. We have
also compared the spectral properties of the dust fluctuations, as extracted
by wavelet analysis, to polar mesospheric summer echo (PMSE) strength. In this analysis, we find a relatively
good agreement between the power spectral density (PSD) at the radar Bragg
scale inside the cloud system; however the PMSE edge is not well represented
by the PSD. A comparison of proxies for PMSE strength, constructed from a
combination of derived dusty plasma parameters, shows that no simple proxy can
reproduce PMSE strength well throughout the cloud system. Edge effects are
especially poorly represented by the proxies addressed here.
Iron minerals inhibit the growth of Pseudomonas brassicacearum J12 via a free-radical mechanism: implications for soil carbon storage
Authors: Du Hai-Yan , Yu Guang-Hui , Sun Fu-Sheng , Usman Muhammad , Goodman Bernard A. , Ran Wei , Shen Qi-Rong
Published: April 2019

Abstract. Natural minerals in soil can inhibit the growth of bacteria that protect
organic carbon from decay. However, the mechanism inhibiting the bacterial
growth remains poorly understood. Here, using a series of cultivation
experiments and biological, chemical and synchrotron-based spectral analyses,
we showed that kaolinite, hematite, goethite and ferrihydrite had a
significant inhibitory effect on the growth of the model bacteria
Pseudomonas brassicacearum J12, which was more prominent with a
concentration of 25 mg mL−1 than it was with either 10 or
5 mg mL−1. In contrast, montmorillonite promoted the growth of J12.
Compared to Al-containing minerals, Fe(III)-containing minerals produced more
hydroxyl radical (HO⚫) that has high efficiency for the
inhibition of J12. Moreover, a significant positive correlation between
HO⚫ radical and Fe(II) was found, suggesting that Fe(II)
contributes to the generation of HO⚫. Furthermore, both
micro X-ray fluorescence and X-ray photoelectron spectroscopies indicated
that surface Fe(III) was reduced to Fe(II), which can produce
HO⚫ through the well-known Fenton reaction series. Together,
these findings indicate that the reduced surface Fe(II) derived from
Fe(III)-containing minerals inhibits the growth of Pseudomonas brassicacearum J12 via a free-radical mechanism, which may serve as a
ubiquitous mechanism between iron minerals and all of the heterotrophic
bacteria in view of taxonomically and ecologically diverse heterotrophic
bacteria from terrestrial environments as a vast source of superoxide.
Anthropogenic and catchment characteristic signatures in the water quality of Swiss rivers: a quantitative assessment
Authors: Botter Martina , Burlando Paolo , Fatichi Simone
Published: April 2019

Abstract. The hydrological and biogeochemical response of rivers carries information
about solute sources, pathways, and transformations in the catchment. We
investigate long-term water quality data of 11 Swiss catchments with the
objective to discern the influence of major catchment characteristics and
anthropic activities on delivery of solutes in stream water. Magnitude,
trends, and seasonality of water quality samplings of different solutes are
evaluated and compared across catchments. Subsequently, the empirical
dependence between concentration and discharge is used to classify the
solute behaviors. While the anthropogenic impacts are clearly detectable in the concentration
of certain solutes (i.e., Na+, Cl−, NO3, DRP), the influence
of single catchment characteristics such as geology (e.g., on Ca2+ and
H4SiO4), topography (e.g., on DOC, TOC, and TP), and size (e.g., on
DOC and TOC) is only sometimes visible, which is also because of the limited sample
size and the spatial heterogeneity within catchments. Solute variability in
time is generally smaller than discharge variability and the most
significant trends in time are due to temporal variations of anthropogenic
rather than natural forcing. The majority of solutes show dilution with
increasing discharge, especially geogenic species, while sediment-bonded
solutes (e.g., total phosphorous and organic carbon species) show higher
concentrations with increasing discharge. Both natural and anthropogenic
factors affect the biogeochemical response of streams, and, while the
majority of solutes show identifiable behaviors in individual catchments,
only a minority of behaviors can be generalized across the 11 catchments
that exhibit different natural, climatic, and anthropogenic features.
Imagen Corporal y su Influencia en la Calidad de Vida en mujeres con mastectomía. Comparación entre mujeres con reconstrucción inmediata, reconstrucción diferida o sin reconstrucción
Authors: Gargantini Andrea Cecilia Gargantini , Martín Casari Leandro
Published: April 2019

Objetivo: Analizar Imagen Corporal y su influencia en Calidad de Vida en mujeres que han tenido una mastectomía para el tratamiento del cáncer de mama, con reconstrucción inmediata, reconstrucción diferida o sin reconstrucción mamaria. Método: Se administró la Escala de Imagen Corporal (S-BIS) y el Inventario de Influencia de imagen corporal sobre calidad de vida (BIQLI-SP) a 30 mujeres, divididas en tres grupos: Reconstrucción inmediata (n=10); Reconstrucción diferida (n=10) y Sin reconstrucción (n=10). Resultado: Las mujeres con reconstrucción inmediata obtuvieron valores inferiores de problemática con la imagen corporal y superiores en calidad de vida relacionada con imagen corporal. Y aquellas sin reconstrucción obtuvieron valores superiores respecto a problemática con la imagen corporal e inferiores en calidad de vida relacionada con imagen corporal. Las diferencias entre los grupos no alcanzaron significación estadística. En ambos instrumentos aparece la sexualidad como área afectada. Finalmente, se encontraron correlaciones significativas negativas entre Imagen Corporal y Calidad de Vida relacionada con imagen corporal en dos subgrupos: Reconstrucción inmediata y Sin reconstrucción. Conclusiones: Aquellas mujeres que tuvieron reconstrucción mamaria tras la mastectomía presentan mejor ajuste que aquellas sin reconstrucción. Y, entre los tipos de reconstrucción, quienes accedieron a reconstrucción inmediata presentan menor deterioro de imagen corporal. Sin embargo, algunas mujeres demuestran haber integrado los cambios en una nueva imagen corporal sin necesidad de reconstrucción. Entonces, elegir no reconstruir puede ser una opción saludable y adecuada para muchas mujeres. Lo importante es que toda mujer, independientemente de sus circunstancias, pueda acceder a las mismas opciones para atravesar esta situación.
Onychoscopy: an observational study in 237 patients from the Kashmir Valley of North India
Authors: Bhat Yasmeen , Mir Muzafar , Keen Abid , Hassan Iffat
Published: April 2019

Background: Nail disorders comprise approximately 10% of all dermatological conditions. Because diagnosis is not always possible by clinical means alone, additional diagnostic procedures may be required at times. Dermoscopy of nails (onychoscopy) has shown promising results in diagnosing various nail disorders and also avoids time-consuming investigations such as culture and biopsy.
Objective: To study the dermoscopic features of various nail disorders to determine the correlation between KOH examination and onychoscopic patterns in patients with the clinical suspicion of onychomycosis, and to differentiate benign pigmented lesions from malignant ones.
Methods: An open, observational and cross-sectional study of 237 patients was conducted. All patients underwent clinical examination and the affected nails were examined with a dermatoscope. The onychoscopic patterns were identified and recorded.
Results: The study included 237 patients with the following diagnoses: 81 onychomycosis, 63 psoriasis, 27 lichen planus, 30 longitudinal melanonychia, 24 connective tissue disorders, 5 onychophagia and nail tics, 3 subungual verrucae, 2 glomus tumor, 1 Darier disease, and 1 enchondroma. The most common onychoscopic findings were spiked pattern in cases of onychomycosis, dilated and tortuous capillaries in cases of psoriasis, longitudinal streaks and nail fragmentation in cases of lichen planus, and enlarged capillaries in cases of connective tissue diseases.
Limitations: The study was only observational and did not compare the results to biopsy and culture.
Conclusions: Onychoscopy may be used as an important diagnostic tool when evaluating nail disorders.
The potential roles of herpesvirus and cytomegalovirus in the exacerbation of pemphigus vulgaris
Authors: Mohammadi Fariba , Khalili Zahra , Marashi Sayed Mahdi , Ehsani Amirhoushang , Daneshpazhooh Maryam , Teymoori-Rad Majid , Balighi Kamran , Nejati Ahmad , Shahmahmoodi Shohreh , Izadidakhrabadi Shima , Mahmoudi Hamidreza , Noormohammadpour Pedram
Published: April 2019

Background: Among exogenous etiologies, the critical role of microbial agents such as herpesviruses (HSV1/2) and cytomegalovirus (CMV) in triggering and flaring autoimmune conditions such as pemphigus vulgaris (PV) has been recently discovered.
Objectives: The present study aimed to investigate the plausible role of these viruses in the exacerbation of PV using serological and molecular methods.
Patients/Methods: Sixty patients with PV (30 with relapse type and 30 with remission type) were recruited for the purpose of this case-control study. Skin, mucosal, and throat specimens were obtained and examined for viruses by reverse transcriptase polymerase chain reaction. To determine the immunoglobulin G (IgG) titer, enzyme-linked immunosorbent assay was used.
Results: Desmoglein1-specific IgG was positive in 56.7% of patients with the relapse form and in 20.0% of those with the remission form indicating a significant difference across the 2 groups (P = 0.003), but the rate of positivity for desmoglein3-specific IgG in the relapse and remission types was 76.7% and 63.3%, respectively, with no significant difference (P = 0.260). There was no difference in the mean levels of HSV-IgG and CMV-IgG in the relapse and remission groups. HSV and CMV positivity in PV patients was independent of the site of the samples. Using the multivariable linear regression model, the level of CMV-IgG in PV patients was directly affected by female sex and advanced ages.
Conclusions: Our study could not demonstrate the role of HSV1/2 and CMV as triggering factors for PV exacerbation. Further studies are needed to evaluate the potential role of these viruses in PV exacerbation especially considering demographic variables.
Potential applications of topical oxygen therapy in dermatology
Authors: Bennardop Luigi , Del Duca Ester , Dastoli Stefano , Schipani Giusy , Scali Elisabetta , Silvestri Martina , Nisticò Steven
Published: April 2019

Background: Topical oxygen therapy is a cosmetic procedure that is becoming more and more popular in dermatology; however, only a few articles on this topic are present in the literature. In this work we report our group experience with oxygen therapy as an adjuvant treatment in various dermatological conditions.
Methods: Four studies were conducted. In the first study we used vehiculated oxygen therapy for diseases that cause hair loss. In the second study oxygen was used in the treatment of mild acne. In the third study moderate acne was treated with topical oxygen. In the fourth study chronic dermatological conditions such as psoriasis and atopic dermatitis were treated with this procedure.
Results: In studies 1 and 2 the outcomes in groups who used topical oxygen therapy as an adjuvant treatment were better than in the groups that did not use it. Studies 3 and 4 also showed very good results, but no control groups were present in the study.
Conclusion: Topical oxygen therapy was useful in the treatment of hair loss conditions, mild and moderate acne, and in chronic cutaneous diseases, showing effectiveness as a support therapy in all of these conditions. Further and larger studies should be conducted to better evaluate its effectiveness in dermatological conditions.
¿Se puede motivar a nuestros alumnos para que cursen con agrado e interés nuestras asignaturas de matemáticas?
Authors: Molina Legaz Roque
Published: April 2019

En esta charla se trata de reflexionar (e incitar al debate con el resto de asistentes a estas jornadas Exido 2018) sobre los problemas con los que habitualmente nos encontramos los docentes a la hora de motivar a nuestros alumnos para que comprendan la utilidad que tienen las asignaturas de Matemáticas a cursar en su grado, y que, en la medida de lo posible, entiendan que se puede disfrutar con las mismas, así como que vean a estas asignaturas como parte de un todo, en lugar de como algo aislado en su formación y que no tienen más remedio que superar para obtener su ansiado grado.
Achilles tendon reconstruction with a half-width Achilles graft and wrap-around fascial flap
Authors: Prasetyono Theddeus Octavianus Hari , Sisca Fransisca
Published: April 2019

A 70-year-old man complained imbalance while walking, inability to perform ankle flexion, and could not stand on tip-toe 3 months after injury. The ankle looked swollen with loss of Achilles contour and obvious gait disturbance. Magnetic resonance imaging shows a 5-cm Achilles tendon gap. Subsequently, surgery was performed to solve the neglected Achilles tendon rupture. Patient was put under general anesthesia with a regional block. Using a non-tourniquet technique, a reconstructive procedure was performed using a half-width autologous Achilles tendon graft, which was attached to the calcaneal prominence with wire in a double strand Bunnell fashion. As for the proximal stump, double core Bunnell/modified Kessler suturing was carried out to suture the graft to Achilles stump. To increase the vascularization, an ipsilateral gastrocnemius fascial flap with a distally based-pedicle was harvested to wrap around the tendon graft. At a 6-month follow-up, the patient was able to stand on tip-toe and had also regained a normal gait.
Bayesian Model Averaging for Selection of a Risk Prediction Model for Death within Thirty Days of Discharge: The SILVER-AMI Study
Authors: Murphy Terrence E. , Tsang Sui W. , Leo-Summers Linda S. , Geda Mary , Kim Dae H. , Oh Esther , Allore Heather G. , Dodson John , Hajduk Alexandra M. , Gill Thomas M. , Chaudhry Sarwat I.
Published: April 2019

We describe a selection process for a multivariable risk prediction model of death within 30 days of hospital discharge in the SILVER-AMI study. This large, multi-site observational study included observational data from 2000 persons 75 years and older hospitalized for acute myocardial infarction (AMI) from 94 community and academic hospitals across the United States and featured a large number of candidate variables from demographic, cardiac, and geriatric domains, whose missing values were multiply imputed prior to model selection. Our objective was to demonstrate that Bayesian Model Averaging (BMA) represents a viable model selection approach in this context. BMA was compared to three other backward-selection approaches: Akaike information criterion, Bayesian information criterion, and traditional p-value. Traditional backward-selection was used to choose 20 candidate variables from the initial, larger pool of five imputations. Models were subsequently chosen from those candidates using the four approaches on each of 10 imputations. With average posterior effect probability ≥ 50% as the selection criterion, BMA chose the most parsimonious model with four variables, with average C statistic of 78%, good calibration, optimism of 1.3%, and heuristic shrinkage of 0.93. These findings illustrate the utility and flexibility of using BMA for selecting a multivariable risk prediction model from many candidates over multiply imputed datasets.
Effects of Oil Prices and Exchange Rates Movements on JSE Stock Return Volatility
Authors: Molele Sehludi Brian , Ncanywa Thobeka
Published: April 2019

South Africa has targeted the oil and gas sector for investment through the industrial action plan as a special economic zone. This paper focussed on the effects of oil prices and exchange rate movements in the oil and gas stock returns using the GARCH - GED model to incorporate volatility. Additionally, the paper estimates causality effects through the pairwise Granger causality techniques using secondary monthly data for the period 2007 - 2015. The findings where that change in oil prices had a positive and significant mean effect on oil and gas sector stock returns. Furthermore, changes in exchange rates had a negative and significant mean effect on the sector returns. Volatility clustering was found to be present in the sector stock returns, but volatilities associated with each of the significant variables do not last for long before it fades away. It is highly recommended that market players or investors and portfolio managers should have a keen interest on the exchange rate. While policy makers and regulators should strive to have stable exchange rate movements to offset unexpected or sudden decline of the exchange rate, depreciation. This has the detriment of additional costs through oil prices purchase by companies in the sector.