bluuebunny/crossref_metadata_2025_split huggingface dataset:
«Nativos digitales» lejos de la naturalización. Procesos de socialización de beneficiarios de políticas de inclusión digital
Authors: Welschinger Lascano Nicolás 
Published: February 2018

Sobre la base de una etnografía del accionar del Programa Conectar Igualdad como política pública de inclusión digital, en este artículo se presentan interpretaciones descentradas de la noción de «nativos digitales» sobre el carácter relacional de la producción de la agencia juvenil en los aprendizajes y el rol de las disputas intergeneracionales en los procesos de socialización con las nuevas tecnologías digitales. Se exploran, así, las expectativas y las tensiones que se desarrollaron en el proceso de inclusión de las tecnologías a la cotidianeidad escolar para comprender la trama relacional en la que los jóvenes beneficiarios de esta política se apropiaron de estas.
Academic achievement and formal thought in engineering students
Authors: Vázquez Stella Maris , Difabio de Anglat Hilda 
Published: February 2018

Introducción: La investigación acerca del desempeño en la Universidad relaciona el fracaso y la deserción con las deficiencias en el razonamiento formal. No hemos hallado trabajos sobre el tema, referidos a población argentina, a pesar de las limitaciones observadas en este aspecto. De allí que el objetivo principal de este trabajo sea la presentación de las relaciones halladas entre la operatividad formal y el nivel de desempeño académico en 1er. Año de Ingeniería.Método: El estudio se hizo con una muestra de 709 estudiantes que cursaban alguna de las cuatro especialidades de Ingeniería en una Universidad argentina. Se aplicó el test de pensamiento lógico-formal (TOLT) de Tobin y Capie. También se recogieron datos sobre características demográficas y rendimiento académico. Resultados: Se observaron relaciones estadísticamente significativas entre el nivel de pensamiento formal y las calificaciones en el examen de admisión, en los exámenes de Álgebra, Análisis Matemático, Física y QuímicaConclusión: Los resultados muestran que el razonamiento probabilístico y correlacional son los menos logrados por los estudiantes de 1er. Año. Los mismos fueron utilizados para el diagnóstico y el diseño de intervención en las actividades tutoriales de la Universidad. La convergencia de estos resultados con los de investigaciones en otros países, muestran que el TOLT puede ser un instrumento válido en la investigación transcultural.
Investigating The Relation Between The Secondary School Students’ Computer Game Preferances And Their Tendency To Violance
Authors: ŞAHİN Ayfer 
Published: February 2018

The aim of this stady to explore the
effects of the violent tendencies of computer games on the secondary school
students, this study contains that how much these kinds of games are prefferret
by students and the effect of this situation on violent behavior.

The working group of the study was
composed of 208 students who continue their education at 5th, 6th, 7th and 8th
grades of a private and state secondary school. The data of the research were
gathered through a 27-question survey and data analysis was realized by using
percentage, frequency and comparison test. The significance level was defined
as .05 for the comparisons.

The results showed that the students
play computer games too much however this fact does not have an effect on their
tendency to violence.Secondary school students mostly prefer action, adventure,
strategy and education games . Most of
the students prefer to play the games alone without going to game saloons and
they feel uncomfortable because of the violence in the computer games.
A REVISED METHOD FOR SUCKER STERILIZATION TO SUPPORT THE IN VITRO PROPAGATION OF SAGO PALM (Metroxylon sagu Rottb.)
Authors: Tajuddin Teuku , . Karyanti , Sukarnih Tati , Haska Nadirman 
Published: February 2018

Hutan sagu (Metroxylon sagu Rottb.) dapat ditemukan dalam area yang cukup luas di wilayah Maluku dan Papua. Besarnya keanekaragaman hayati dari pohon sagu dapat dilihat di areal ini. Pohon sagu tumbuh secara alami terutama di daerah dataran atau rawa dengan sumber yang air melimpah. Tanaman sagu dapat diperbanyak dengan metode generatif melalui biji, dan vegetatif melalui tunas anakan. Dalam rangka mendukung perbanyakan pohon induk yang unggul secara in vitro dalam skala besar, perbaikan metode sterilisasi tunas anakan mutlak diperlukan. Tunas anakan muda (15-20 cm) yang diperoleh dari Propinsi Papua digunakan sebagai eksplan. Tujuan percobaan sterilisasi ini dilakukan untuk mendukung perbanyakan pohon sagu secara in vitro. Pada percobaan ini antibiotik digunakan untuk membersihkan jaringan internal eksplan dari jamur dan bakteri. Hasil percobaan ini menunjukkan bahwa campuran alkohol dan antibiotik dapat menekan pertumbuhan kontaminan.Kata kunci: Antibiotik, kontaminan jamur dan bakteri, kultur in vitro, metode sterilisasi, sagu ABSTRACTNatural sago (Metroxylon sagu Rottb.) forest can be found in large area in Maluku and Papua regions. There are wide genetic diversities of sago palm found in these areas. This palm grows along riverbanks and in swampy areas which are not suitable for other crops. Sago palm is propagated generatively by seed and vegetatively by suckers. With the purpose of establishing the in vitro culture method for a large-scale of mass clonally propagation of superior genotypes of sago palm, generating sterilized explants are very important. Young suckers (15-20 cm) obtained from areas of Papua Province were used as explants. The sterilization experiments were carrying out to support the tissue culture of sago palm. Sterilization was conducted using antibiotics in order to get rid of fungi and bacteria from inner part of explants tissues. The results showed that from all sterilization methods tested, the best result was treatment using alcohol and antibiotic as disinfectant agents.Keywords: Antibiotics, fungi and bacteria contaminants, in vitro culture, sterilization method, sago palm
Un estudio exploratorio para la adaptación de la versión española revisada del "Early Numeracy Test-R" para evaluar el aprendizaje matemático temprano
Authors: Araújo Antonio , Aragón Estíbaliz , Aguilar Manuel , Navarro José I. , Ruiz Gonzalo 
Published: February 2018

La utilización de un soporte informatizado como procedimiento de evaluación puede presentar ciertas ventajas frente a la tradicional vía de lápiz-y-papel. Un ejemplo de ello es la variable motivacional que asociada a las tareas informatizadas puede conllevar a una mayor funcionalidad de los resultados. Además, la vía informatizada, puede medir una alta gama de variables como el tiempo de respuesta, aciertos y errores, etc. La herramienta que presentamos es una adaptación de un instrumento de lápiz y papel, Early-Numeracy-Test-R que está siendo estandariza en nuestro país. Mediante un entorno multimedia, se evalúan los distintos componentes que intervienen en el desarrollo de la
competencia matemática en niños en edad escolar de 4 a 7 años. Este tipo de medición proporciona información sobre los componentes relacionales y cognitivos implícitos en el desarrollo matemático, permitiendo una predicción de qué niño evaluado puede encontrar dificultades en el aprendizaje matemático. Este hecho puede favorecer los procesos de prevención e intervención temprana de las dificultades de aprendizaje matemático. En este estudio se presentan datos preliminares del proceso de estandarización.
Inteligencia emocional del aula y su relación con el desempeño académico
Authors: Aritzeta Aitor , Balluerka Nekane , Gorostiaga Arantxa , Alonso-Arbiol Itziar , Haranburu Mikel , Gartzia Leire 
Published: February 2018

A pesar de la importancia nuclear de las emociones en el contexto académico no existen medidas de Inteligencia Emocional (IE) grupal aplicadas al aula. El objetivo del presente trabajo consistió en desarrollar un cuestionario para la medida de la IE grupal (G-TMMS) en contextos académicos. Las propiedades psicométricas del G-TMMS fueron examinadas en una muestra de 794 participantes dividida en 59 aulas (47% mujeres; Mediaedad = 16; DT = 1.4). El G-TMMS mostró una estructura unifactorial, una consistencia interna adecuada, estabilidad temporal y validez convergente. Además, la IE grupal del aula se mostró asociada con un mayor desempeño escolar grupal. El trabajo discute las implicaciones de esta nueva escala en el contexto educativo.
La estructura factorial de las habilidades cognitivas en la infancia
Authors: Martins Azevedo , Filipa Alves Ana , Almeida Leandro S. 
Published: February 2018

Estudios recientes señalan evidencias contradictorias con respecto a la diferenciación y organización de las habilidades cognitivas en la infancia. La teoría de la inversión de Cattell sostiene que durante las primeras etapas de la vida, el individuo comienza con una habilidad general (inteligencia fluida), cuya relevancia tiende a disminuir debido a la aparición durante la adolescencia de habilidades diferenciadas desarrolladas a través del proceso de socialización y que están asociadas a las motivaciones, intereses y experiencias. Con este estudio se pretende investigar si la estructura factorial de los resultados en una batería de pruebas apoya la existencia de un factor general o, en cambio, una estructura formada por diferentes factores específicos. Una muestra de 472 escolares portugueses, con edades entre los 4 y 10 años, llevó a cabo la Escala de Competências Cognitivas para Crianças (ECCOs 4/10) y cuatro sub-pruebas del Wechsler Intelligence Scale for Children – Third Edition (WISC-III) y Wechsler Preschool and Primary Scale of Intelligence – Revised (WPPSI-R). El ajuste de algunos modelos que reflejan diferentes teorías psicométricas de la inteligencia se puso a prueba mediante varios análisis factoriales confirmatorios (AFC). Se analizaron además las implicaciones de los modelos probados en la organización de las habilidades cognitivas para el desarrollo cognitivo y para el aprendizaje escolar en la infancia.
Medical Students' Attitude to wards Anatomy Dissection: A Study from Nepal
Authors: Sharma Nitasha , Subedi S , Pandit R 
Published: February 2018

INTRODUCTION: Among medical education institutions worldwide, the time allotted for anatomy instruction has decreased without any reasonable time optimization suggestions. In addition, the utility of cadaver dissection has long been debated.MATERIAL & METHODS: This study was conducted to determine the attitudes of preclinical students to cadaver dissection in the study of human anatomy. A collection of questionnaire was introduced to 290 preclinical students, including both MBBS and BDS of Universal College of Medical Sciences, Nepal. For each question, the students were to choose one of the three possible responses: “yes”, “no” or “undecided”. Out of the 290 students (162 female and 128 male) involved in the study.RESULTS: Fifty five percentage said they were curious, 41% experience of anatomy dissection hall was interesting, 3% said it was enj oyable and remaining 1% said it was boring. An analysis of the questionnaire showed that a vast majority of the students (93%) considered cadaver dissection as important and indispensable in the study of human anatomy, on the issue of replacing cadaver dissection with plastic models in the near future, majority of the students under study (73%) didn't favored such a replacement, while 24% did. In the present study, 29% of students mentioned there was not enough chances of dissection for every individual students and 40% of students said the time allocated for dissection classes was not enough.CONCLUSION: From the results of the present study, one might confidently infer that cadaver dissection is still considered important and indispensable in the study of human anatomy.Journal of Universal College of Medical Sciences, Vol. 5, No, 2, 2017, Page: 12-17
Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function
Authors: Yang Jinyi , Wu Xue-Bing , Liu Dezi , Fan Xiaohui , Yang Qian , Wang Feige , McGreer Ian D. , Fan Zuhui , Yuan Shuo , Shan Huanyuan 
Published: February 2018

Abstract
We report the results of a faint quasar survey in a one-square-degree field. The aim is to test the

and

color selection criteria for quasars at faint magnitudes to obtain a complete sample of quasars based on deep optical and near-infrared color–color selection and to measure the faint end of the quasar luminosity function (QLF) over a wide redshift range. We carried out a quasar survey based on the

and

quasar selection criteria, using the deep Y-band data obtained from our CFHT/WIRCam Y-band images in a two-degree field within the F22 field of the VIMOS VLT deep survey, optical co-added data from Sloan Digital Sky Survey Stripe 82 and deep near-infrared data from the UKIDSS Deep Extragalactic Survey in the same field. We discovered 25 new quasars at

and

mag within one-square-degree field. The survey significantly increases the number of faint quasars in this field, especially at

. It confirms that our color selections are highly complete in a wide redshift range (

), especially over the quasar number density peak at

, even for faint quasars. Combining all previous known quasars and new discoveries, we construct a sample with 109 quasars and measure the binned QLF and parametric QLF. Although the sample is small, our results agree with a pure luminosity evolution at lower redshift and luminosity evolution and density evolution model at redshift

.
Orbital Motion of Young Binaries in Ophiuchus and Upper Centaurus–Lupus
Authors: Schaefer G. H. , Prato L. , Simon M. 
Published: February 2018

Abstract
We present measurements of the orbital positions and flux ratios of 17 binary and triple systems in the Ophiuchus star-forming region and the Upper Centaurus–Lupus cluster based on adaptive optics imaging at the Keck Observatory. We report the detection of visual companions in MML 50 and MML 53 for the first time, as well as the possible detection of a third component in WSB 21. For six systems in our sample, our measurements provide a second orbital position following their initial discoveries over a decade ago. For eight systems with sufficient orbital coverage, we analyze the range of orbital solutions that fit the data. Ultimately, these observations will help provide the groundwork toward measuring precise masses for these pre-main-sequence stars and understanding the distribution of orbital parameters in young multiple systems.
Imbalanced Learning for RR Lyrae Stars Based on SDSS and GALEX Databases
Authors: Zhang Jingyi , Zhang Yanxia , Zhao Yongheng 
Published: February 2018

Abstract
We apply machine learning and Convex-Hull algorithms to separate RR Lyrae stars from other stars like main-sequence stars, white dwarf stars, carbon stars, CVs, and carbon-lines stars, based on the Sloan Digital Sky Survey and Galaxy Evolution Explorer (GALEX). In low-dimensional spaces, the Convex-Hull algorithm is applied to select RR Lyrae stars. Given different input patterns of (u − g, g − r), (g − r, r − i), (r − i, i − z), (u − g, g − r, r − i), (g − r, r − i, i − z), (u − g, g − r, i − z), and (u − g, r − i, i − z), different convex hulls can be built for RR Lyrae stars. Comparing the performance of different input patterns, u − g, g − r, i − z is the best input pattern. For this input pattern, the efficiency (the fraction of true RR Lyrae stars in the predicted RR Lyrae sample) is 4.2% with a completeness (the fraction of recovered RR Lyrae stars in the whole RR Lyrae sample) of 100%, increases to 9.9% with 97% completeness and to 16.1% with 53% completeness by removing some outliers. In high-dimensional spaces, machine learning algorithms are used with input patterns (u − g, g − r, r − i, i − z), (u − g, g − r, r − i, i − z, r), (NUV − u, u − g, g − r, r − i, i − z), and (NUV − u, u − g, g − r, r − i, i − z, r). RR Lyrae stars, which belong to the class of interest in our paper, are rare compared to other stars. For the highly imbalanced data, cost-sensitive Support Vector Machine, cost-sensitive Random Forest, and Fast Boxes is used. The results show that information from GALEX is helpful for identifying RR Lyrae stars, and Fast Boxes is the best performer on the skewed data in our case.
New Constraints on Gliese 876—Exemplar of Mean-motion Resonance
Authors: Millholland Sarah , Laughlin Gregory , Teske Johanna , Butler R. Paul , Burt Jennifer , Holden Bradford , Vogt Steven , Crane Jeffrey , Shectman Stephen , Thompson Ian 
Published: February 2018

Abstract
Gliese 876 harbors one of the most dynamically rich and well-studied exoplanetary systems. The nearby M4V dwarf hosts four known planets, the outer three of which are trapped in a Laplace mean-motion resonance. A thorough characterization of the complex resonant perturbations exhibited by the orbiting planets, and the chaotic dynamics therein, is key to a complete picture of the system’s formation and evolutionary history. Here we present a reanalysis of the system using 6 yr of new radial velocity (RV) data from four instruments. These new data augment and more than double the size of the decades-long collection of existing velocity measurements. We provide updated estimates of the system parameters by employing a computationally efficient Wisdom–Holman N-body symplectic integrator, coupled with a Gaussian process (GP) regression model to account for correlated stellar noise. Experiments with synthetic RV data show that the dynamical characterization of the system can differ depending on whether a white-noise or correlated-noise model is adopted. Despite there being a region of stability for an additional planet in the resonant chain, we find no evidence for one. Our new parameter estimates place the system even deeper into resonance than previously thought and suggest that the system might be in a low-energy, quasi-regular double apsidal corotation resonance. This result and others will be used in a subsequent study on the primordial migration processes responsible for the formation of the resonant chain.
The Effects of Environment on the Evolution of the Galaxy Stellar Mass Function
Authors: Papovich Casey , Kawinwanichakij Lalitwadee , Quadri Ryan F. , Glazebrook Karl , Labbé Ivo , Tran Kim-Vy H. , Forrest Ben , Kacprzak Glenn G. , Spitler Lee R. , Straatman Caroline M. S. , Tomczak Adam R. 
Published: February 2018

Abstract
We study the effects of galaxy environment on the evolution of the stellar mass function (SMF) over 0.2 < z < 2.0 using the FourStar Galaxy Evolution (ZFOURGE) Survey and NEWFIRM Medium-Band Survey (NMBS) down to the stellar mass completeness limit,

(9.5) at z = 1.0 (2.0). We compare the SMFs for quiescent and star-forming galaxies in the highest and lowest environments using a density estimator based on the distance to the galaxies’ third-nearest neighbors. For star-forming galaxies, at all redshifts there are only minor differences with environment in the shape of the SMF. For quiescent galaxies, the SMF in the lowest densities shows no evolution with redshift other than an overall increase in number density (ϕ*) with time. This suggests that the stellar mass dependence of quenching in relatively isolated galaxies both is universal and does not evolve strongly. While at

, the SMF of quiescent galaxies is indistinguishable in the highest and lowest densities, at lower redshifts, it shows a rapidly increasing number density of lower-mass galaxies,

, in the highest-density environments. We argue that this evolution can account for all the redshift evolution in the shape of the total quiescent galaxy SMF. This evolution in the quiescent galaxy SMF at higher redshift (z > 1) requires an environmental quenching efficiency that decreases with decreasing stellar mass at 0.5 < z < 1.5 or it would overproduce the number of lower-mass quiescent galaxies in denser environments. This requires a dominant environmental process such as starvation combined with rapid gas depletion and ejection at z > 0.5–1.0 for galaxies in our mass range. The efficiency of this process decreases with redshift, allowing other processes (such as galaxy interactions and ram-pressure stripping) to become more important at later times, z < 0.5.
Donner la parole aux interprètes : le mythe de la neutralité et autres facteurs contextuels pouvant nuire à la performance
Authors: René de Cotret François , Ošlejšková Eva , Tamouro Soumya , Leanza Yvan 
Published: February 2018

Tel que le note Hsieh (2016), les facteurs contextuels pouvant avoir une influence sur la performance de l’interprète n’ont été que peu étudiés en santé, ce que notre étude cible. Méthode : Nous avons effectué une analyse thématique des propos de 24 interprètes de Montréal (Canada), divisés en quatre groupes de discussion. Résultats : Leur discours gravite autour de 11 facteurs contextuels nuisant à la performance, répartis en trois thèmes : consultation interprétée, principes éthiques et conditions de travail. Discussion : La majorité des 11 facteurs touche à la qualité de la relation interprète-praticien, minée entre autres par un manque de temps multiforme entourant la consultation et l’idée voulant que les praticiens recherchent en l’interprète un conduit. Le domaine nécessite un réaménagement conceptuel, en particulier à propos de la neutralité de l’interprète, qui n’est pas un mythe dommageable tel que l’avance Angelelli (2004), mais un puissant vecteur relationnel.
Lueurs et leurres de la santé globale
Authors: Thiongane Oumy , Graham Janice , Broutin Hélène 
Published: February 2018

Le projet Vaccins Méningite a permis à des millions d’Africains de disposer d’un vaccin peu coûteux, le MenAfriVac®, grâce à un transfert de technologie. Les récits de la biomédecine en ont fait une histoire à succès, un mythe sociotechnique anonyme et collectif dans lequel le MenAfriVac® revêt une efficacité magique. Les promoteurs du vaccin ont choisi la rhétorique de l’élimination de la méningite par un vaccin, occultant un contexte épidémiologique plus complexe, notamment la persistance d’épidémies, docu-mentées et dues à des sérogroupes autres que ceux ciblés par le MenAfriVac®. Cette contribution a pour objectif d’analyser la construction du succès autour du vaccin et les paradoxes qui poussent à être prudent face aux initiatives de santé mondiale plébiscitant une solution universelle et expéditive par la technologie. Nous verrons que la solution par le vaccin repose sur des repré-sentations clés de ce qu’est un succès. Ensuite, la contribution souligne que le MenAfriVac® est révélateur d’un type de « solution globale » privilégiant un émiettement des priorités et une visée à court terme de la santé publique.
Student Developed Knowledge Portfolios from a Soil Fertility Course
Authors: Sindelar Meghan , Mamo Martha , Wingeyer Ana 
Published: February 2018

Core Ideas
Portfolios are useful for students to organize and reflect upon course content.
Portfolios can serve as a knowledge toolbox that students can use in future work.
The portfolio assignment used in a soil fertility course is described.
Students who have completed the Soil Nutrient Relationships course at the University of Nebraska–Lincoln often contact instructors once they have begun full‐time work, seeking reminders of specific concepts. These students either did not take or keep detailed notes during the course. To assist students, instructors have developed a portfolio requirement for the course. One important learning objective from each recitation exercise was summarized as deliverable knowledge in the student's portfolio. Feedback was then provided on portfolio components each week with resubmission encouraged, so that students leave with accurate information in their own words. The objective of this article is to summarize the details of the portfolio assignment used in Soil Nutrient Relationships to assist other instructors in developing student assignments and assessments. Following completion of the knowledge portfolio, students were surveyed with more than 75% response rate in both the 2016 and 2017 semesters. More than 44% of respondents agreed that they thought they would use the portfolio in their future work, and more than 15% of respondents agreed that the portfolio would be the most important component of class toward their future work.