bluuebunny/crossref_metadata_2025 huggingface dataset:
Travail domestique : des classes populaires conservatrices ?
Authors: Cartier Marie , Letrait Muriel , Sorin Matéo
Published: April 2018

Cet article étudie la façon dont hommes et femmes des classes populaires perçoivent l’inégale répartition des tâches domestiques et y réagissent. En mobilisant à la fois des données statistiques et dix-sept monographies de couples hétérosexuels avec enfants, il défend l’idée que la période historique qui va des années 1980 jusqu’à nos jours se caractérise moins par la permanence d’un attachement positif des classes populaires à une stricte division des rôles sexués, que par une lente différenciation des conceptions en matière de travail domestique à l’intérieur même de ces classes. L’attachement à une stricte division sexuée du travail vaut surtout pour leurs strates les plus précaires. Les ménages stabilisés des classes populaires s’en détachent à travers la participation, certes modeste mais accrue, des hommes ouvriers et employés aux tâches domestiques mais aussi à travers la mise en question du déséquilibre domestique par les femmes.
Probiotic properties of native Lactobacillus spp. strains for dairy calves
Authors: Fernández S. , Fraga M. , Silveyra E. , Trombert A.N. , Rabaza A. , Pla M. , Zunino P.
Published: April 2018

The use of native microorganisms with probiotic capacity is an alternative tool for the treatment and prevention of several diseases that affect animals, such as neonatal calf diarrhoea. The selection of probiotic strains within a collection is based on different in vitro and in vivo assays, which predict their potential. The aim of this study was to characterise a group of native Lactobacillus spp. strains isolated from faeces of healthy calves using an in vitro approach and to assess their ability to colonise the gastrointestinal tract (GIT) of calves. Native Lactobacillus spp. strains were evaluated on their capacity to survive low pH conditions and bile salts presence, biofilm formation and adhesion to both mucus and Caco-2 cells. Based on the in vitro characterisation, four strains (Lactobacillus johnsonii TP1.1, Lactobacillus reuteri TP1.3B, L. johnsonii TP1.6 and Lactobacillus amylovorus TP8.7) were selected to evaluate their capacity to colonise and persist in the GIT of calves. The assessment of enteric persistence involved an in vivo assay with oral administration of probiotics and quantification in faeces of the administered bacterial species with real-time quantitative PCR (qPCR). The study was conducted using 15 calves (1-month-old) which were divided into five groups of three animals, four of which were treated with four different selected strains and one was the control group. Strains TP1.3B and TP1.6 managed to persist in treated animals until ten days after the end of the administration period, indicating that they could be promising candidates for the design of probiotics for calves.
Study of Nano-Creep of Unfilled and Filled Cross-Linking Polypropylene
Authors: Ovsik Martin , Stanek Michal , Reznicek Martin , Hylova Lenka
Published: April 2018

Cross-linking is a process in which polymer chains are associated through chemical bonds. Radiation, which penetrated through specimens and reacted with the cross-linking agent, gradually formed cross-linking (3D net), first in the surface layer and then in the total volume, which resulted in considerable changes in specimen behavior. This paper describes the effect of electron beam irradiation on the nanoindentation creep of unfilled and glass fiber filled polypropylene (25%). nanoindentation creep were measured by the DSI (Depth Sensing Indentation) method on samples which were non-irradiated and irradiated by different doses of the β – radiation (0, 30, 45 and 60 kGy). The purpose of the article is to consider to what extent the irradiation process influences the resulting nanoindentation creep measured by the DSI method. The unfilled and filled polypropylene tested showed significant changes of indentation creep. The measured results indicate, that electron beam irradiation is very effective tool for improvement of creep properties of unfilled and filled polypropylene. The nanoindentation creep after irradiated unfilled Polypropylene was decreased up to 16 % (filled polypropylene was decreased up to 9%) compared to non-irradiated surface. These changes were examined and confirmed by Gel content.
The Influence of Finishing Strategy on the Quality of Surface
Authors: Hnátík Jan , Kroft Luboš , Bícová Katerina
Published: April 2018

The present contribution focuses on finishing operations in machining. Finishing operations belong to the most time-consuming and surface quality-critical machining tasks. High-quality tools are available nowadays for choosing optimal tool paths for finishing. Yet, the finishing options for general shaped surfaces are still severely limited. Although CAM systems can efficiently generate tool paths, none of them offers the combination of finishing tool paths, modern productive methods and adaptive tool paths. Increasing the productivity while maintaining dimensional accuracy and the quality of finished surfaces is the key point in finishing. One of the ways to improving productivity is the use of constant cutting speed. The aim of this article is to present experimental verification of these assumptions and demonstrate the impact on the quality of the finished surface
Method of Evaluation of the Properties of Thin Steel Sheets by Springback Test
Authors: Spišák Emil , Majerníková Janka , Kaščák Ľuboš
Published: April 2018

Production of thin packaging sheets has gone through significant changes in recent years. Thickness of thin packaging sheets has decreased from 0.24mm down to 0.14 – 0.18mm due to the material saving, and the thickness of tin coating layer has decreased as well. Thin packaging sheets with the thickness lower than 0.18mm are produced with so called double reduction. Materials produced with this method possess higher strength properties and lower plastic properties. There exist several tests for examination of strength and plastic properties. Requirements of the processors of these sheets are that these tests are simple, without a complicated production of specimens, and easily repeatable. Exactly because of these reasons, the springback test is used for evaluation of double reduced packaging sheets by many processors from various countries. This contribution compares properties of double reduced thin packaging sheets obtained with the springback test, uniaxial tensile test and biaxial tensile test. Goal of this comparison is to objectify mechanical and plastic properties of packaging sheets obtained with the individual tests.
Analysis of a Broken Pin on the Brake System of a Car Trailer
Authors: Hazlinger Marián , Moravčík Roman , Moravčíková Jana , Delgado Sobrino Daynier Rolando
Published: April 2018

Fatigue of materials is the degradation process that results from the cyclical dynamic loading of components in combination with other internal or external factors, e.g. corrosion, defects, etc. This paper mainly focuses on the analysis of the causes leading to the damage of a pin in a car trailer´s braking system. The damage of the pin was caused by a few, mutually independent, parameters. Several techniques such as macroscopy, microscopy (light, SEM) and dimension measurement were used for the damage analysis. The material and geometry of the pin were the main issues identified leading to the failure of the part in question.
Erectile dysfunction in patients taking psychotropic drugs and treated with phosphodiesterase-5 inhibitors
Authors: Mazzilli Rossella , Angeletti Gloria , Olana Soraya , Delfino Michele , Zamponi Virginia , Rapinesi Chiara , Del Casale Antonio , Kotzalidis Georgios D. , Elia Jlenia , Callovini Gemma , Girardi Paolo , Mazzilli Fernando
Published: April 2018

Objectives: The aim of this study was to assess the prevalence of patients with Erectile Dysfunction (ED) receiving psychotropic drugs, the impact of these drugs on hormonal profile, and the efficacy of PDE5-i in these patients. Materials and methods: We recruited 1872 patients referring for ED to our Andrology Unit. Assessment included serum testosterone, gonadotropins, TSH, prolactin, and PSA, and the IIEF-5 questionnaire for ED diagnosis. Inclusion criteria were age 21-75 years and IIEF-5 total score ≤ 21; exclusion criteria included hypogonadism, diabetes mellitus, previous prostatectomy, other medication intake, and ED diagnosis prior to psychotropic drug treatment. Efficacy was rated with the IIEF-5 (remission: total score ≥ 22). Results: The prevalence of ED patients treated with psychotropic drugs since ≥ 3 months was 9.5% (178/1872), subdivided according to the drugs used into: Group A, 16 patients treated with atypical antipsychotics (9.0%); Group B, 55 patients with benzodiazepines (30.9%); Group C, 33 patients with antidepressant drugs (18.5%); and Group D, 74 patients with multiple psychotropic drugs (41.6%). Patients in Group A were significantly younger than other groups (p < 0.05). The hormonal profile presented only higher prolactin level in patients treated with antipsychotics, alone or in combination (p < 0.05). Overall, 146 patients received PDE5-i. Remission rate, after three months of treatment, was significantly higher in Group B compared to C and D groups (p < 0.05). Conclusions: A substantial portion of patients receiving psychotropic drugs show ED. Sexual performance in these patients benefits from PDE5-i. Age, effects of psychiatric disorders, psychotropic drugs, and PDE5-i treatment modality accounted for variability of response in this sample.
Evaluation of so2 sorbent utilization in fluidized beds
Authors: Hamer C A
Published: April 2018

A bench-scale fluidized-bed reactor was used to evaluate more than forty limestone and dolomite samples from twenty-five deposits and quarries in Nova Scotia, New Brunswick, and Alberta for their ability to capture SO2 emitted during the fluidized-bed combustion
of coal. Nineteen of the samples were also evaluated by thermogravimetric analysis; a comparison of the two methods is given. The detrimental effect of coal ash on the sulphation capacities of two limestones was studied. Sulphation appears to decrease with increasing iron oxide content in the ash.
Various methods of improving the limestone utilization in fluidized beds were investigated. Finely ground and pelletized limestone improved the sulphation capacity as much as five times that of the coarse limestone. Similar improvements were observed by hydrating partially sulphated bed material,
and also by grinding and pelletizing used bed material. The parameters of the sulphation curve equation derived from the FBR tests are incorporated with the operating data for large-scale fluidized-bed units in the Argonne National Laboratory model to predict the performance of the sorbents in those
units. The model prediction compares very well with actual data from a pilot-scale fluidized-bed and the Summerside fluidized-bed combustor.
Clinical Outcomes of Endovascular Thrombectomy in Tissue Plasminogen Activator versus Non-Tissue Plasminogen Activator Patients at Primary Stroke Care Centers
Authors: Imbarrato Gregory , Bentley Joshua , Gordhan Ajeet
Published: April 2018

Background: The effect of intravenous tissue plasminogen activator (IV tPA) administration before endovascular intervention as compared to without at thrombectomy-capable low-volume centers on procedural aspects and patient outcomes has not been investigated. Methods: Retrospective chart review was performed in all consecutive large vessel cerebrovascular accident patients treated with endovascular therapy at two select rural primary stroke centers between 2011 and 2015. Patients’ data regarding age, sex, and medical history, as well as thrombus location by catheter-based cerebral angiography, postprocedural reperfusion status, and clinical outcomes were reviewed. The primary outcome measure of the study was a comparison of modified Rankin scale (MRS) at 90 days in patients’ postendovascular thrombectomy with prior IV tPA administration versus those who underwent thrombectomy and did not qualify for preprocedural IV tPA. Results: After application of the set inclusion and exclusion criteria, data of 46 out of 65 patients were analyzed. Twenty-three patients (50%) received IV tPA before thrombectomy and 23 patients did not qualify for IV tPA (50%). Successful recanalization (thrombolysis in cerebral infarction 2b/3) was achieved in 86% (20/23 patients) of thrombectomy patients without preprocedural IV tPA and 82% (19/23) of patients who received it (odds ratio [OR]: 0.03, confidence interval [CI]: 95% 0.062–0.16, P < 0.0001). MRS of 2 or less at 90 days was 43.4% (10/23) in patients with no preprocedural IV tPA and 39.1% (9/23) in the combined therapy group (OR: 0.84, CI: 0.26–2.70, P = 0.8). Conclusion: Patients undergoing endovascular thrombectomy for large vessel occlusion at select low-volume rural centers showed benefit from this treatment regardless of IV tPA administration. Clinical outcomes and complications at select low-volume thrombectomy-proficient centers are comparable to large volume comprehensive stroke centers as well as the landmark studies proving the efficacy of endovascular treatment.
Parapoxvirus Infections in the Country of Georgia: A Case Series
Authors: Chakhunashvili Giorgi , Carlson Bradley F. , Power Laura , Khmaladze Ekaterine , Tsaguria Davit , Gavashelidze Mari , Zakhashvili Khatuna , Imnadze Paata , Boulton Matthew L.
Published: April 2018

Infections caused by viruses of the parapoxvirus (PPV) genus, including orf and pseudocowpox viruses, are frequently seen in both humans and animals in many regions of the world. These infections are often misdiagnosed or neglected because of the lack of clinician awareness, inadequate diagnostic capacity, and their relatively mild disease presentation, which may result in affected individuals not seeking medical attention. Although PPV infections should be routinely considered in patients with cutaneous lesions, especially in those who have occupational exposure to farm animals, they are often excluded from the differential diagnosis because they are not perceived as serious, resulting in underestimation of the burden of disease. Since 2014, significant enhancements to Georgia’s epidemiologic and laboratory capacity have made PPV surveillance and detection possible. In this study, we present information on 27 confirmed cases of PPV infection reported to Georgia’s national surveillance system from January 2016 through January 2017.
Genomic Characterization and Seroprevalence Studies on Alphaviruses in Uruguay
Authors: Burgueño Analía , Frabasile Sandra , Díaz Luis Adrián , Cabrera Andrés , Pisano María Belén , Rivarola María Elisa , Contigiani Marta , Delfraro Adriana
Published: April 2018

Alphaviruses (Togaviridae) are arboviruses frequently associated with emerging infectious diseases. In this study, we aimed to investigate the presence of alphaviruses in Uruguay by detecting the viral genome in mosquitoes and neutralizing antibodies in equines. A total of 3,575 mosquitoes were analyzed for alphavirus genome detection. Serologic studies were performed on 425 horse sera by plaque reduction neutralization test (PRNT80) against Venezuelan equine encephalitis virus (VEEV) subtype IAB, Pixuna virus (PIXV), Rio Negro virus (RNV), western equine encephalitis virus (WEEV), and Madariaga virus (MADV). Mosquitoes belonging to six genera were captured and 82.9% were identified as Culex pipiens. Two Cx. pipiens pools collected in Fray Bentos and Las Toscas localities were alphavirus positive, and phylogenetic analyses showed that the sequences grouped into two different clusters: the lineage I of eastern equine encephalitis virus and RNV (VEEV complex), respectively. Plaque reduction neutralization test assays showed antibodies against strains of the VEEV complex, MADV, and WEEV. Rio Negro virus was the most geographically widespread virus, showing higher seroprevalences (up to 20%). Seroprevalences against VEEV IAB ranged between 4.6% and 13%; antibodies against PIXV, WEEV, and MADV were less frequent (3–4%). In conclusion, RNV exhibited the highest seroprevalence in horses, a wide geographical distribution, and viral genome was detected in Cx. pipiens mosquitoes. Madariaga virus had a low seroprevalence in equines, but an epizootic lineage typical of North America was detected in Cx. pipiens mosquitoes. Taken together, our results show that alphaviruses are present in Uruguay with variable occurrence and geographical distribution being a potential threat for human and equine health.
EL APRENDIZAJE DE LAS COMPETENCIAS REQUERIDAS EN EL CAMPO DEL FOTOPERIODISMO
Authors: Irala-Hortal Pilar
Published: April 2018

En el panorama de la formación universitaria del grado de periodismo no todas las universidades españolas incluyen el fotoperiodismo, y de ellas suelen centrarse en el estudio de la historia de la disciplina y de la lectura de la imagen (y muchas veces solo si la materia pertenece a un grado transversal o compartido con Comunicación Audiovisual). Es decir, la formación técnica y el aprendizaje de la cámara fotográfica, el manejo del lenguaje visual y de la comunicación a través de creación de imágenes y de la representación no son vistos, en general, por los egresados en Periodismo de la universidad española. En el presente trabajo explicaré la importancia de la formación y la capacitación técnica del periodista, las implicaciones del aprendizaje del fotoperiodismo de autor y cómo puede abordarse esta formación fundamental para el egresado en periodismo o comunicación dentro de los planes de estudio. Me centraré en las vías para planificar, organizar, gestionar, guiar y evaluar el aprendizaje de la técnica fotográfica y el fotoperiodismo en el nivel de grado.
Panorama de las enseñanzas de la fotografía en la facultad de Bellas Artes de Madrid. UCM. 1979-2017
Authors: Castelo Sardina Luis
Published: April 2018

En 1978 se produce la transformación de la Escuela de Bellas Artes de San Fernando en Facultad de Bellas Artes, quedando integrada dentro de los estudios universitarios de la Universidad Complutense de Madrid. Casi al mismo tiempo, 1979, las asignaturas de Fotografía se incorporan a las enseñanzas de oficiales en Bellas Artes. Aunque en un principio la fotografía se pensó como una materia de “servicios” a otras materias tradicionales como la pintura o la escultura, rápidamente adquirió peso propio y pudo distanciarse de ese carácter secundario que se le pretendía dar. La asignatura de fotografía fue introducida e impartida en esas fechas por los profesores Joaquín Perea y José Fernández Oyarzabal. Poco después se incorporarían como profesores Cristina García Rodero, Antonio Bueno, Pedro Saura y Matilde Múzquiz. También están o han estado impartiendo estas asignaturas profesores como: Carlos Fernández Villasante, Valentín Sama, Rafa Trobat, Toya Legido, Tomás Zarza, Lucía Moreno Diz, Itziar Ruiz, Pablo Álvarez Couso y Luis Castelo. Las asignaturas de Fotografía han ido pasando desde la fecha de su incorporación por sucesivos planes de estudio casi siempre en un segundo plano. Nunca hemos tenido troncalidad y siempre han sido asignaturas optativas, excepto en los primeros cursos. Si se han ido manteniendo ha sido gracias a la enorme demanda que siempre han tenido por parte de los estudiantes. Aun en la actualidad no existe, en el catálogo del Ministerio, un área de conocimiento específica en Fotografía, lo que hace que estemos incluidos en el área de conocimiento tan peculiar como Dibujo. Siendo este tema de urgente modificación especialmente con motivo de las reestructuración que están sufriendo numerosa facultades de nuestro país. En la actualidad las asignaturas de fotografía están presentes en todos los grados que (Bellas Artes, Diseño y Conservación y restauración de bienes culturales) impartimos, así como en los másteres de Diseño y de Investigación, Arte y Creación Los trabajos fin de grado y fin de máster, así como el aumento del número de tesis inscritas y leídas sobre estos temas, reflejan claramente la tendencia e interés, cada vez mayor en la fotografía, vista esta desde los distintos prismas de cada una de los grados, pero la necesidad de tener un grado en fotografía o un máster oficial se hacen cada vez más imperiosas, por ello creo que la oportunidad de debatir sobre estos temas a nivel nacional es de suma importancia para establecer acuerdos y estrategias que nos puedan beneficiar a todos los implicados de una u otra manera en la enseñanza de la fotografía en España.
In Lak’ ech: you are my other me
Authors: Perego Aurora , Quinan Christine
Published: April 2018

This article aims to explore the potential of transgender studies to offer new trans* and interdisciplinary perspectives that simultaneously question dominant power structures and engage with multiple and unexpected becomings. We believe that the disruptive force of trans-disciplinarity lies in its capacity to open up space for marginalised populations and knowledges by creating a co-emergence of theories and methodologies that, rather than gathering different disciplines around the same topic, becomes, in Roland Barthes’s words, ‘a new object that belongs to no one’. The article attempts to re-imagine interdisciplinarity as a decolonial trans- practice that questions broader processes of exclusion occurring in academia. Such envisioning will unfold around the concept of intersectionality, which we consider necessary to challenge and transform the exclusions reproduced through disciplinary knowledge production. In this respect, we maintain that interdisciplinarity must be constituted so as to trans-cend and queer not only disciplinary boundaries, but also the processes of normalisation that create them. We combine this theorisation with the Mayan principle of In Lak’ ech, which unveils the interdependence of animate and inanimate beings on Earth and thereby has the potential to disrupt not only the notion of ‘proper object’ that belongs to specific disciplines but also the ‘proper subject’, namely disciplinary hierarchies per se. The principle of In Lak’ Ech allows us to envision trans-disciplinary becoming as a practice of intersectional resistance that opens space for radical, trans-, queer, and decolonial social critiques.
Trans smuggling in Jean Genet’s Our lady of the flowers
Authors: Templeton Ainslie
Published: April 2018

This article understands the work of Jean Genet, in particular his first novel, Our Lady of the Flowers (1943), as a site of reappraisal in the context of contemporary transgender studies scholarship. Moving away from Genet’s articulation as a figurehead of gay literature, it understands the trans elements of his work as smuggled through his canonical placement, but also as instances of smuggling in their own right. Irit Rogoff names smuggling as a mode of ‘embodied criticality’ that prioritises movement despite structures of power, and produces meaning through intricate webs of connectedness (2006, p. 1). The article sees this operation in the gender non-conforming protagonist of Genet’s text; Divine, who engages multiple configurations of recognition and movement, both in the novel and in secondary sources. Jean-Paul Sartre and Edmund White rearticulate Genet’s work within canonical frameworks of philosophy, literary, and queer studies. These are self-implicating projects in which their own canonicity becomes entwined with Genet’s, intervening in the work’s possibilities of movement and interpretation. Kathy Acker’s engagement with Genet breaks with these writers. She, likewise, engages canonical frameworks; however, her demonstrated criticality of those frameworks attempts to amplify the smuggling movement of Genet’s text. Tracing smuggling in Our Lady of the Flowers, this article moves towards an expanded understanding of differing configurations of visibility, differing critical priorities, and differing utilities of movement over time and space.
High-dynamic-range imaging for cloud segmentation
Authors: Dev Soumyabrata , Savoy Florian M. , Lee Yee Hui , Winkler Stefan
Published: April 2018

Abstract. Sky–cloud images obtained from ground-based sky cameras are usually captured using a fisheye lens with a wide field of view. However, the sky exhibits a large dynamic range in terms of luminance, more than a conventional camera can capture. It is thus difficult to capture the details of an entire scene with a regular camera in a single shot. In most cases, the circumsolar region is overexposed, and the regions near the horizon are underexposed. This renders cloud segmentation for such images difficult. In this paper, we propose HDRCloudSeg – an effective method for cloud segmentation using high-dynamic-range (HDR) imaging based on multi-exposure fusion. We describe the HDR image generation process and release a new database to the community for benchmarking. Our proposed approach is the first using HDR radiance maps for cloud segmentation and achieves very good results.
OUTPACE long duration stations: physical variability, context of biogeochemical sampling, and evaluation of sampling strategy
Authors: de Verneil Alain , Rousselet Louise , Doglioli Andrea M. , Petrenko Anne A. , Maes Christophe , Bouruet-Aubertot Pascale , Moutin Thierry
Published: April 2018

Abstract. Research cruises to quantify biogeochemical fluxes in the ocean require
taking measurements at stations lasting at least several days. A popular
experimental design is the quasi-Lagrangian drifter, often mounted with in
situ incubations or sediment traps that follow the flow of water over time. After initial
drifter deployment, the ship tracks the drifter for continuing measurements
that are supposed to represent the same water environment. An outstanding
question is how to best determine whether this is true. During the
Oligotrophy to UlTra-oligotrophy PACific Experiment (OUTPACE) cruise, from 18
February to 3 April 2015 in the western tropical South Pacific, three
separate stations of long duration (five days) over the upper 500 m
were conducted in this quasi-Lagrangian sampling scheme. Here we present
physical data to provide context for these three stations and to assess
whether the sampling strategy worked, i.e., that a single body of water
was sampled. After analyzing tracer variability and local water circulation
at each station, we identify water layers and times where the drifter risks
encountering another body of water. While almost no realization of this
sampling scheme will be truly Lagrangian, due to the presence of vertical
shear, the depth-resolved observations during the three stations show most
layers sampled sufficiently homogeneous physical environments during OUTPACE.
By directly addressing the concerns raised by these quasi-Lagrangian sampling
platforms, a protocol of best practices can begin to be formulated so that
future research campaigns include the complementary datasets and analyses
presented here to verify the appropriate use of the drifter platform.
The development and test research of multi-channel Synchronous
transient electromagnetic receiver
Authors: Lin Fanqiang , Wang Xuben , Chen Kecheng , Hu Depan , Gao Song , Zou Xue , Zeng Cai
Published: April 2018

Abstract. As a result of the drastic reduction of shallow mineral resources, the exploitable potential and reserve of proven mines are insufficient, and the mineral resources in deep ground need to be more refinedly explored.There are some disadvantages of the existing instruments, such as few channels and slow sampling rate, etc. Therefore, multi-parameter transient electromagnetic instrument with synchronous receiving has been developed and tested. The instrument is composed of two controllers, embedded controller and programmable logic controller, which can provide diversified information combination. Under the grounding electrode source emission mode, the real-time synchronous transient electromagnetic acquisition system of six channels is achieved with 128 k sampling rate. The data of the six channels are recorded in the full time range in the time domain. At the same time, experiments were carried out in laboratory, open areas and actual mine. Through data analysis, the measured data curves of the mining area are highly consistent with the existing geochemical exploration curves and geological profile.
The onset of chaos in nonautonomous dissipative dynamical systems: A low-order ocean–model case study
Authors: Pierini Stefano , Chekroun Mickaël D. , Ghil Michael
Published: April 2018

Abstract. The transition to chaos induced by periodic forcing in systems that are not chaotic in the autonomous limit is studied with a four-dimensional nonlinear spectral ocean model. The analysis is based on the systematic construction of the system’s pullback attractors (PBAs) through ensemble simulations derived from a large number of initial states in the remote past. A preliminary analysis of the autonomous system is carried out by constructing its bifurcation diagram, as well as by calculating a metric measuring the mean distance between two initially nearby trajectories, along with the system’s entropy. We find that nonchaotic attractors can still exhibit sensitive dependence on initial data; this apparent paradox is resolved by noting that the dependence only concerns the phase of the periodic trajectories, and that it disappears once the latter have converged onto the attractor. The periodically forced system, analyzed by the same methods, yields periodic or chaotic PBAs depending on the periodic forcing’s amplitude ε. A new diagnostic method – based on the cross-correlation between two initially nearby trajectories – is proposed to characterize the transition between the two types of behavior. Transition to chaos is found to occur abruptly at a critical value εc and begins with the intermittent emergence of periodic oscillations with distinct phases. The same diagnostic method is finally shown to be a useful tool for autonomous and aperiodically forced systems as well.
Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula
Authors: Falk Ulrike , López Damián A. , Silva-Busso Adrián
Published: April 2018

Abstract. The South Shetland Islands are located at the northern tip of the Antarctic
Peninsula (AP). This region was subject to strong warming trends in the
atmospheric surface layer. Surface air temperature increased about
3 K in 50 years, concurrent with retreating glacier fronts, an
increase in melt areas, ice surface lowering and rapid break-up and
disintegration of ice shelves. The positive trend in surface air temperature
has currently come to a halt. Observed surface air temperature lapse rates
show a high variability during winter months (standard deviations up to ±1.0K(100m)-1) and a distinct spatial heterogeneity
reflecting the impact of synoptic weather patterns. The increased
mesocyclonic activity during the wintertime over the past decades in the
study area results in intensified advection of warm, moist air with high
temperatures and rain and leads to melt conditions on the ice cap, fixating
surface air temperatures to the melting point. Its impact on winter
accumulation results in the observed negative mass balance estimates. Six
years of continuous glaciological measurements on mass balance stake
transects as well as 5 years of climatological data time series are presented
and a spatially distributed glacier energy balance melt model adapted and run
based on these multi-year data sets. The glaciological surface mass balance
model is generally in good agreement with observations, except for
atmospheric conditions promoting snow drift by high wind speeds,
turbulence-driven snow deposition and snow layer erosion by rain. No drift in
the difference between simulated mass balance and mass balance measurements
can be seen over the course of the 5-year model run period. The winter
accumulation does not suffice to compensate for the high variability in
summer ablation. The results are analysed to assess changes in meltwater
input to the coastal waters, specific glacier mass balance and the
equilibrium line altitude (ELA). The Fourcade Glacier catchment drains into
Potter cove, has an area of 23.6 km2 and is glacierized to
93.8 %. Annual discharge from Fourcade Glacier into Potter Cove is
estimated to q¯=25±6hm3yr-1 with the standard
deviation of 8 % annotating the high interannual variability. The
average ELA calculated from our own glaciological
observations on Fourcade Glacier over the time period 2010 to 2015
amounts to 260±20 m. Published studies suggest
rather stable conditions of slightly negative glacier mass balance
until the mid-1980s with an ELA of approx. 150 m. The
calculated accumulation area ratio suggests dramatic changes in the
future extent of the inland ice cap for the South Shetland Islands.
Multi-component ensembles of future meteorological and natural snow conditions for 1500 m altitude in the Chartreuse mountain range, Northern French Alps
Authors: Verfaillie Deborah , Lafaysse Matthieu , Déqué Michel , Eckert Nicolas , Lejeune Yves , Morin Samuel
Published: April 2018

Abstract. This article investigates the climatic response of a series of indicators for
characterizing annual snow conditions and corresponding meteorological
drivers at 1500 m altitude in the Chartreuse mountain range in the Northern
French Alps. Past and future changes were computed based on reanalysis and
observations from 1958 to 2016, and using CMIP5–EURO-CORDEX
GCM–RCM
pairs spanning historical (1950–2005) and RCP2.6 (4), RCP4.5 and RCP8.5 (13
each) future scenarios (2006–2100). The adjusted climate model runs were
used to drive the multiphysics ensemble configuration of the detailed
snowpack model Crocus. Uncertainty arising from physical modeling of snow
accounts for 20 % typically, although the multiphysics is likely to have a
much smaller impact on trends. Ensembles of climate projections are rather
similar until the middle of the 21st century, and all show a continuation of
the ongoing reduction in average snow conditions, and sustained interannual
variability. The impact of the RCPs becomes significant for the second half
of the 21st century, with overall stable conditions with RCP2.6, and
continued degradation of snow conditions for RCP4.5 and 8.5, the latter
leading to more frequent ephemeral snow conditions. Changes in local
meteorological and snow conditions show significant correlation with global
temperature changes. Global temperature levels 1.5 and 2 ∘C above
preindustrial levels correspond to a 25 and 32 % reduction, respectively,
of winter mean snow depth with respect to the reference period 1986–2005.
Larger reduction rates are expected for global temperature levels exceeding
2 ∘C. The method can address other geographical areas and sectorial
indicators, in the field of water resources, mountain tourism or natural
hazards.
Retrato tridimensional mediante la utilización de tecnologías de fabricación digital de bajo coste en entornos educativos
Authors: Saorín Jose L. , Bonnet de León Alejandro , Meier Cecile , De la Torre-Cantero Jorge
Published: April 2018

El estudio y la representación de las formas asociadas al cuerpo humano y al retrato es una parte del currículo de las asignaturas de educación plástica, visual y audiovisual en enseñanza secundaria. Actualmente los ejercicios se realizan utilizando técnicas artísticas tradicionales y en la mayoría de los casos en soportes bidimensionales. Cuando se trata de crear modelos tridimensionales, se suele utilizar barro u otros elementos moldeables y técnicas constructivas tradicionales. Esto supone la necesidad de contar con los materiales y herramientas específicas para elaborarlos. En este artículo, se presenta una actividad para la creación de retratos tridimensionales digitales y físicos, cuyo objetivo es que se pueda realizar en centros de educación secundaria. Para ello se utilizan tecnologías 3D de bajo coste que no requieran una formación específica, es decir, accesibles para profesores y alumnos. Dicha actividad ha sido llevada a cabo con dos grupos de profesores y alumnos durante el curso 2015 - 2016. Los resultados permiten comprobar que dicha actividad es viable en un entorno escolar y que se pueden conseguir retratos 3D a bajo coste.
Pensando en imágenes jeroglíficas: de la tradición hermética en el Renacimiento a las vanguardias hasta el arte contemporáneo
Authors: Ferrer-Ventosa Roger
Published: April 2018

En el crisol de la estética renacentista uno de los principales elementos de la aleación fue la imagen jeroglífica, que definió tanto su formalidad como el sustrato teórico que la configuraba. Ese tipo de imagen influyó en algunas de sus estructuras visuales más características del XVI y XVII, como los emblemas. Pero, lejos de desaparecer, en los siglos posteriores se tipo de búsqueda estética ha gozado de diversas reapariciones, especialmente en el siglo XX, con la publicidad, el cómic (Jodorowsky, Promethea), algunas de las incursiones en nuevos lenguajes del vanguardismo (Torres-García) o artistas contemporáneos, como Laffoley o Bruskin. Todos estos artistas comparten algunos rasgos esenciales, con un marco conceptual en el que confluyen hermetismo, neoplatonismo, cábala, esoterismo occidental, y que tanto en el renacimiento como ahora deriva en un estilo que toma como modelo mítico a la escritura jeroglífica. En el presente texto se analizará, por tanto, una de las raíces menos investigadas de las vanguardias y del arte contemporáneo, y cuyo influjo no debe subestimarse. En dicha raíz encontramos un desarrollo de lo que podríamos llamar pensar en imágenes.
Estudio sobre una experiencia educativa con mujeres mayores en centros sociales. Implicaciones para el aprendizaje a lo largo de la vida
Authors: Salmerón Aroca Juan Antonio , Escarbajal De Haro Andrés , Martínez De Miguel López Silvia
Published: April 2018

Hace años que existe constatación empírica de los beneficios de los programas educativos para personas mayores; sin embargo, son pocos los estudios diferenciales sobre las dinámicas de este fenómeno desde la perspectiva de género, a pesar de la evidencia de que las mujeres participan en mayor número que los hombres en esos programas. Este trabajo indaga en las características de la experiencia educativa con mujeres mayores en el ámbito socioeducativo, con el objetivo de conocer las implicaciones que tiene ésa para el aprendizaje a lo largo de la vida, así como para la mejora de la calidad de vida de las participantes. Para ello se cuenta con la opinión de las protagonistas, a través del proyecto “Vivir su Edad Mujer”, desarrollado en los centros sociales de la Región de Murcia, implementada con el punto de vista de los profesionales que trabajan con ese colectivo. Se ha utilizado una metodología cualitativa, analizando la realidad a través de entrevistas semiestructuradas y en profundidad. Entre los resultados obtenidos, destacar que las mujeres mayores reclaman espacios socioeducativos para avanzar hacia una educación proactiva, diferente a la situación de inequidad del sistema educativo tradicional. También es relevante destacar que, durante su participación, emergen significativamente los aspectos dialógicos, expresivos, vinculares y emocionales; de esta manera, las mujeres mayores adquieren estrategias de apoyo para el ámbito relacional, familiar y personal. Por su parte, los profesionales declaran que los programas educativos y socioculturales implementados para mujeres mayores, deben partir de las necesidades de las propias mayores, vehiculando actividades que tengan significado y sentido para ellas. Por eso, se aboga por un modelo educativo respetuoso y acorde con la particular idiosincrasia de las mujeres mayores.
A Study of Mathematics Teachers’ Motivation towards Teaching in Brunei Darussalam
Authors: Sahat Hjh Naziah , Rahman Adina Yantiaryanie Hj A. Abd. , Tengah Khairul Amilin , Li Hui-Chuan , Abdullah Nor Azura
Published: April 2018

Many factors contribute to the success of students’ academic performance. Admittedly, quality of teaching is one of those factors. In this study, based on the related literature on teacher motivation, six main factors affecting teachers’ motivation towards teaching are identified. Accordingly, an online questionnaire was designed by the authors. In total, 207 (40 males and 167 females) mathematics teachers from primary, secondary and sixth-form government schools in Brunei Darussalam randomly volunteered to respond to this questionnaire. The findings from this study have implications for understanding the extent to which factors may motivate or demotivate teachers to teach. The present research provided education stakeholders with important information to ponder over the motivational factors of mathematics teachers in the government schools. The results from our study also suggested that good interaction and collaboration between teachers can help boost teachers’ motivation to teach.
Prólogo 21(2)
Authors: Hooker Blandford Alta Suzzane
Published: April 2018

La Revista Ciencia e Interculturalidad de la Universidad de las Regiones Autónomas de la Costa Caribe Nicaragüense (URACCAN), divulga artículos inéditos de investigación, artículos de revisión bibliográfica y ensayos investigativos que contribuyen a promover las diversas temáticas relacionadas a la ciudadanía intercultural de género. Está dirigida a investigadores, profesores, estudiantes y profesionales vinculados a áreas sensibles como: Educación y Salud Intercultural, Territorialidad, Recursos Naturales y Medio Ambiente, Género e Identidad, Derechos Humanos, en especial los vinculantes a los tratados y convenios internacionales de los pueblos indígenas y afrodescendientes. Para fines de organización, la cobertura temática de la revista contempla las siguientes secciones: Revitalización Lingüística y Cultural, Educación, Educación Intercultural, Género e Identidad, Ciencias Sociales, Recursos Naturales y Medio Ambiente, Agropecuaria, Cultura Indígena y Afrodescendiente, Autonomía Regional, Educación Superior en el Caribe, Humanidades, Salud Intercultural, Ingeniería y Tecnología. Este volumen No. 21, presenta una compilación estructurada en 4 secciones, las cuales comprenden 9 artículos, en el área de Educación: 1) Aprendizaje de las fracciones en estudiantes de séptimo grado del Instituto San Ramón, en Río San Juan de Nicaragua; 2) La preparación de los docentes para la dirección del aprendizaje de la producción de textos escritos; 3) Dinámicas de la actividad científica en el Instituto de Investigaciones Socio-Económicas en la Universidad Nacional de San Juan de Argentina. La segunda sección, En Ciencias Sociales: 4) Economía Comunitaria desde la Perspectiva Intercultural de Género para el Buen Vivir de los Pueblos ¨Otra Economía es Posible. En la tercera sección, Recursos Naturales y Medio Ambiente: 5) Factor de forma para la Tectona grandis L.F, empresa MLR-FORESTAL, Siuna 2016; 6) Ornitofauna en cuatro ecosistemas naturales del laboratorio natural Snaki-URACCAN. En la cuarta sección: Agropecuaria: 7) Competitividad de las organizaciones productoras de cacao (Theobroma cacao L) en la Costa Caribe Sur de Nicaragua; 8) Comportamiento agronómico del cultivo del plátano, variedad curare enano en Sandy Bay Costa Caribe Norte de Nicaragua; 9) Suelos de la finca SNAKY URACCAN. Los resultados de estas investigaciones aportan significativamente a la praxis innovadora de la comunidad universitaria, y constituyen un medio educativo y de comunicación para compartir con la comunidad de profesores, investigadores y estudiantes del mundo académico, en una expresión crítica, autónoma y de emancipación en un ambiente de ciudadanías interculturales de género.
Ornitofauna en cuatro ecosistemas naturales del laboratorio natural Snaki-URACCAN, Costa Caribe Norte de Nicaragua
Authors: Salas Tathum Rudy A , Cordón Suárez Enrique
Published: April 2018

El estudio se realizó en el laboratorio natural Snaki ubicado en el la comunidad de Moss, municipio de Waspam, Región Autónoma de la Costa Caribe Norte. Se ha diagnosticado la ornitofauna en los ecosistemas bosque ripario, bosque latifoliado, área agrícola y área pecuaria del laboratorio natural Snaki-URACCAN. Se realizaron transectos lineales y entrevistas informales a cazadores de la zona que permitió crear un listado de aves y su estado de conservación. Los resultados de los diferentes ecosistemas re ejaron la existencia de 49 diferentes especies de aves, pertenecientes a 23 familias y 12 órde- nes. Las especies representativas son: Aratinga nana, Cyanocorax Morio, Ramphocelus Passerinii, Quiscalus nicaraguensis, Procnias tricarunculata, Tachyponus rufus. Al com- parar los índices de diversidad, Shannon y Simpson encontraron similitudes en sus resultados, existiendo una diversidad considerable en el bosque, principalmente en el de galería.
O acordo da OMC sobre tecnologia da informação (ITA) e sua expansão (ITA II): multilateralização do regionalismo
Authors: Capucio Camilla , De Araújo Kallas e Caetano Fernanda
Published: April 2018

Tendo em vista o contexto da relação entre o multilateralismo e o regionalismo, a celebração de acordos plurilaterais no âmbito da Organização Mundial do Comércio, abertos à participação dos membros interessados, oferece uma perspectiva de multilateralização do regionalismo, na qual os benefícios dos consensos parciais podem ser estendidos à esfera multilateral. O ITA (Information Technology Agreement) – Acordo sobre Tecnologia da Informação é citado como exemplo desta possibilidade, e sua expansão, por meio da criação do ITA II, demonstra o fortalecimento desta tendência de multilateralização do regionalismo, embora com características especiais. Assim, o artigo se desenvolve buscando contextualizar e introduzir a temática do regionalismo e do multilateralismo, para em seguida apresentar a teoria da multilateralização do regionalismo e o ITA como uma dessas experiências, e a sua recente expansão como uma retomada da relevância de tal teoria. Diante dos impasses para conclusão da Rodada de Doha, a expansão desses consensos parciais e a continuidade das negociações na Organização Mundial do Comércio por meio da celebração de acordos plurilaterais setoriais tem se apresentado como uma possível saída, o que demanda uma rearquitetura da interpretação do papel da OMC na governança econômica global.
Uma escolha, múltiplas motivações: o caso dos estudantes do curso de Arquivologia da Universidade Federal de Santa Maria
Authors: Rosa Tatiana Costa , Urbanetto Rosanara Pacheco
Published: April 2018

Introdução: Esta investigação está centrada nas motivações dos estudantes matriculados no primeiro e terceiro semestres, respectivamente, do Curso de Arquivologia da Universidade Federal de Santa Maria.Objetivos: Estabelecer as motivações dos estudantes pela escolha do Curso de Arquivologia da UFSM; caracterizar os sujeitos, identificar os fatores motivacionais e influenciadores na escolha do curso e identificar as expectativas profissionais dos estudantes em relação ao futuro como arquivistas.Metodologia: A presente pesquisa caracteriza-se como de cunho descritiva, aliada a um levantamento, e utiliza-se o método quali-quantitativo como abordagem para compreensão, análise e apresentação dos resultados obtidos.Resultados: A faixa etária dos sujeitos que predominou é 17 a 21 anos, do gênero feminino, residentes na zona urbana. O meio pelo qual a maioria tomou conhecimento do curso foi pela internet. O interesse inicial pela escolha do Curso foi pela baixa nota mínima para ingressar e a listagem das disciplinas que integram o currículo atual, também alguns estudantes foram influenciados por familiares/amigos. Atualmente a maioria considera-se satisfeito com a escolha, permanecem parcialmente com a mesma percepção inicial em relação ao Curso e como perspectivas futuras citam concursos públicos, educação continuada e bom emprego. Os estudantes acreditam que deve haver uma maior divulgação do Curso e dos profissionais que este lança no mercado de trabalho.Conclusões: Por meio dos resultados obtidos espera-se contribuir com os estudantes do Curso de Arquivologia da UFSM para que conheçam as suas motivações e as dos demais colegas, e principalmente colaborar com o Núcleo Docente Estruturante (NDE) do Curso de Arquivologia da UFSM encarregado de promover a próxima Reforma Curricular.Palavras-chave: Curso de Arquivologia. Universidade Federal de Santa Maria. Motivações. Estudantes de Arquivologia.