bluuebunny/crossref_metadata_2025_split huggingface dataset:
ACERCA DE LO IMAGINADO Y LO POR IMAGINAR. CONCEPCIONES DE LOS ACTORES SOBRE UNA RESPUESTA POSIBLE AL FRACASO ESCOLAR
Authors: Durantini Villarino Cecilia L. 
Published: October 2020

En este artículo procuro describir analíticamente el campo de los significados, juicios, valores y modos de ver y entender que un conjunto de actores construye acerca de una respuesta al fracaso escolar en la que se hallan involucrados desde diferentes posiciones socio-institucionales. Sobretodo, con respecto al tema de las condiciones que favorecen y que dificultan la tarea primaria - enseñar y aprender- en esta respuesta; y al tema de su comparación con las condiciones escolares habituales.La línea de investigación de referencia, se propone avanzar en el conocimiento de las respuestas y los espacios educativos alternativos a los espacios escolares habituales, destinados a sujetos, parcial o totalmente excluidos del sistema educativo. Sus interrogantes centrales aluden a las relaciones entre las condiciones y dinámica de esas respuestas y espacios y la posibilidad de que estos sujetos recuperen, si lo habían perdido, o desarrollen, si los tienen, el deseo y la posibilidad de aprender en un contexto de institucionalización educativa.El material de entrevista correspondiente a los actores del caso estudiado, se organiza alrededor de tres condiciones del mismo como respuesta al fracaso escolar: el estilo del maestro, el lugar del funcionamiento y la organización interna. Aquí, luego de presentar el objeto de análisis y la línea investigativa en que se inscribe, desarrollo referencias conceptuales de base y brindo noticias sobre los diseños empleados. A continuación, presento el caso y los actores. En tercer lugar, procuro dar cuenta de los avances interpretativos elaborados, acerca de la cuestión foco de análisis. Estos se estructuran en torno al planteo de las tensiones entre organización e institución; entre lo instituido, lo instituyente y lo posible.
ACTIVIDADES QUE PERMITEN RECONOCER EL PENSAMIENTO PROPORCIONAL CUALITATIVO Y CUATITATIVO EN ESTUDIANTES DE SEXTO GRADO DE EDUCACIÓN PRIMARIA
Authors: Gallardo Patricia Camarena , Ruiz Ledesma Elena Fabiola 
Published: October 2020

El presente artículo plantea el reconocimiento del pensamiento proporcional tanto cualitativo como cuantitativo del estudiante, a través de identificar las estrategias que se llevan a cabo al abordar las actividades planteadas a un grupo de 29 alumnos mexicanos (11 años de edad), que cursaban el sexto grado de educación básica. Se emplean como fundamentación teórica la Matemática en el Contexto de las Ciencias y estudios realizados por investigadores que se han interesado en estos tópicos. La metodología está integrada por el diseño de las actividades, la descripción de los indicadores para la identificación de ambos tipos de pensamiento proporcional y el análisis de los resultados.
LA INVESTIGACIÓN COMO ÁMBITO DE INSERCIÓN PARA LOS GRADUADOS DE CIENCIAS DE LA EDUCACIÓN: REALIDADES Y PERSPECTIVAS
Authors: Pozzo María Isabel 
Published: October 2020

La presente reseña evoca el seminario “La investigación como ámbito de inserción para los graduados de Ciencias de la Educación: realidades y perspectivas” y los temas desarrollados en el mismo. En los acotados márgenes que impone una reseña,se intenta difundir algunas orientaciones muy demandadas por los graduados y aportar a la reflexión sobre la inserción de los mismos en el campo de la investigación.
LA SENSIBILIDAD POR LAS VIOLENCIAS EN EL ESPACIO ESCOLAR DESDE EL DISCURSO MEDIÁTICO
Authors: Saez Virginia , Silva Verónica Soledad 
Published: October 2020

El artículo presenta los hallazgos de una investigación socioeducativa sobre los discursos mediáticos. El objetivo es analizar la mediatización del caso conocido como la Masacre de Carmen de Patagones sucedido en el año 2004 en Argentina. Se basa en el análisis cualitativo de una muestra de ciento cincuenta y dos notas de los diarios de la ciudad de La Plata, en el período 2004-2006. La fuente de datos fue secundaria y se realizó una muestra finalística, seleccionando las notas que aportaran información de interés en relación al objetivo estipulado. El método utilizado es el análisis socioeducativo del discurso. La presente investigación amplía la base empírica con la que analizar y problematizar cómo es representada la escuela, sus actores y los episodios de violencia en los medios de comunicación. Los resultados evidencian que desde la prensa los episodios de violencia en las escuelas son construidos desde una perspectiva individualizante, a través de las voces autorizadas por especialistas y apelando a un discurso emotivo, que obstaculizan análisis más complejos.
Konstrukcja białoruskich cymbałów. Historia – ewolucja – perspektywy
Authors: Porakh Aleksandr 
Published: October 2020

Od początku XX wieku w Białoruskiej Socjalistycznej Republice Radzieckiej zaczęła się kształtować akademicka szkoła gry na cymbałach. Ludowy instrument został poddany licznym modernizacjom, aby sprostać wymogom powszechnego systemu muzyki europejskiej opartego o skalę chromatyczną. Powstała unikatowa odmiana instrumentu – cymbały akademickie.
Tematyka białoruskich cymbałów jest niewystarczająco znana wśród polskich czytelników. Pewne informacje dotyczące historii i budowy instrumentu można znaleźć w książkach Piotra Dahliga Cymbaliści w kulturze polskiej i Edwarda Mojsaka Szkoła gry na cymbałach. Niniejszy artykuł jest próbą bliższego przedstawia historii rozwoju konstrukcji cymbałów na Białorusi.
Praca jest napisana w oparciu o literaturę białoruską i rosyjską. W artykule zostały zdefiniowane pojęcia i koncepcje takie jak instrument narodowy i jego akademizacja. Można je spotkać w dotychczasowych opracowaniach naukowych.
Historia akademizacji instrumentów narodowych sięga XIX wieku i jest związana z postacią Wasilija Andriejewa. Jego działalności zawdzięczamy modernizację bałałajki i wprowadzenie tego instrumentu na światową scenę.
W oparciu o doświadczenie Wasilija Andriejewa i jego następców w 1927 roku dokonano modernizacji białoruskich ludowych cymbałów. W projekcie uczestniczyli: cymbalista Josif Żynowicz, lutnik Konstantyn Suszkiewicz oraz instrumentalista, kompozytor i dyrygent Dmitrij Zachar. Budowa wewnętrzna instrumentu była zmodyfikowana na podstawie akustycznych badań naukowych. Konstruktorzy poszerzyli zakres dźwiękowy instrumentu do trzech oktaw i wprowadzili skalę chromatyczną. Zmieniono formę pałeczek-młoteczków. Zostały wprowadzone orkiestrowe odmiany cymbałów: pryma, alt, tenor, bas i kontrabas. Szczegóły tych zmian wraz z ilustracjami są przedstawione w kolejnej części artykułu.
W związku z rosnącym profesjonalizmem cymbalistów budowa instrumentu wymaga rewizji i udoskonalenia również w czasach obecnych. Od momentu zamknięcia w 2006 roku fabryki w Borysowie produkcją białoruskich cymbałów zajmują się wyłącznie lutnicy. Każdy lutnik oferuje rozwiązania w oparciu o własne doświadczenia i upodobania. Sukcesy białoruskich instrumentalistów przyczyniły się do wzrostu zainteresowania białoruskimi cymbałami za granicą. W artykule zostały omówione konstrukcje instrumentów takich lutników jak: Aleksandr Proćko (Białoruś), Taras Baran (Ukraina), Marc Ramser (Szwajcaria).
Porównanie poszczególnych modeli cymbałów stworzonych przez lutników pozwala wysunąć przypuszczenie, że konstrukcja białoruskich cymbałów może rozwijać się w następujących kierunkach: rozszerzenie górnego rejestru, rozszerzenie dolnego rejestru, wprowadzenie mechanizmu tłumienia strun. Można jednak stwierdzić, że ostateczna weryfikacja tych innowacji należy do instrumentalisty-wykonawcy.
Sociedades hidraúlicas en los Andes
Authors: Gelles H. Paul 
Published: October 2020

"...en aquellos trabajos de utilidad colectiva... se hacía indispensable la cooperación de los diferentes elementos aislados... la necesidad material de poseer productos naturales alimenticios, que aseguraran su bienestar y prosperidad, hizo que construyeran por acción cooperativa obras verdaderamente estupendas, entre las cuales debe considerarse en primer lugar los anales y represas de irrigación, que surcaron en territorio en extensiones considerables, y que llevaron las aguas en extensiones considerables, y que llevaron el territorio en extensiones considerables, y que llevaron las aguas a lugares tan inaccesibles que difícil es concebir que hayan sido alguna vez realizadas" (Tello y Miranda 1923).
Millieu Therapy Metode Kreasi Seni Modifikasi Lingkungan Terhadap Tingkat Harga Diri Remaja
Authors: Linda Yani Athi , Retnowuni Arifa 
Published: October 2020

Adolescence is a transition period between childhood and adulthood. Massive changes from childhood to adulthood are common at ages 13 to 20 years. Previous research discusses the difficulties of social interaction with peers, social relationships with groups, and difficulty communicating with a social new environment. Some students expressed stress with the number of Islamic boarding school rules, controlled and far from parents. At the same time, 32% of people agreed that they were not confident, sad, anxious, afraid of intimidation, and decreased learning enthusiasm. People who looked down on trust would have an external and internal impact. The external consequence is difficulty reaching academic achievement and social relations. The internal consequence is difficulty reaching internal self-concept, unclear, complicated, uncertain self goals, and pessimistic in the future challenge. This study aimed to know the level of self-esteem of students after being given milieu therapy with environmental modification art creation. The study design uses pre-experimental with pre-post test design of one group. The sampling technique was purposive sampling. Samples were taken as many as 24 respondents and divided into 4 groups of 6 people in each group. The intervention was given for 3 weeks. In this study, measuring instruments used a questionnaire using Rosenberg and data analysis using the Wilcoxon test signed a ranking test. The statistical analysis showed the results of p = 0.030 <α. There was a milieu effect of therapeutic methods of environmental modification art creation on students' level of self-esteem living in the dormitory. Milieu therapy can increase awareness and self-confidence between peers with the approval of self-confidence and commitments agreed between friends.
THE EFFECT OF HYDROPONIC NUTRITION LEVELS ON THE GROWTH OF MUSTARD (BRASSICA SP.) PLANTS
Authors: Basri Arie Hapsani Hasan , Mahmudah Mahmudah 
Published: October 2020

The main roles of plant growth was nutrition. This research aims to determine the concentration of nutrients that can provide the best growth and yield on various mustard. The research method used is a factorial Complete Randomized Design (RBD) with three replications and then analyzed using the Least Significant Difference test (LSD) at a level of 5%. The treatment of vegetable types is as follows: S1 = mustard pakchoy, S2 = mustard samhong, S3 = mustard pagoda, S4 = mustard pakchoy mini. Treatment with nutrition is the AB mix fertilizerzs number of leaves solution as follows: N1 = 1000 ppm, N2 = 1200 ppm, N3 = 1400 ppm, N4 = 1600 ppm, N5 = 1800 ppm. The results showed that plant height, number of leaves, leaf width and wet weight of the pagoda and mini pakchoy plants were not significantly different at 1000 ppm, 1200 ppm, 1400 ppm, 1600 ppm and 1800 ppm. Number of leaves of pakchoy significantly different at 1400 ppm. While the number of leaves and leaf width of samhong plants were not significantly different at each treatment, but were significantly different from plant height at 1600 ppm and significantly different from the wet weight at 1400 ppm
Measuring the Stellar Population Parameters of the Early-type Galaxy NGC 3923: The Challenging Measurement of the Initial Mass Function*
Authors: Feldmeier-Krause A. , Lonoce I. , Freedman W. L. 
Published: October 2020

Abstract
Recent studies of early-type galaxies have suggested that the initial mass function (IMF) slope is bottom-heavy; that is, they contain a larger fraction of low-mass stars than the Milky Way. However, measurements of the IMF remain challenging in unresolved galaxies because features in their observed spectra are sensitive to a number of factors, including the stellar age, metallicity, and elemental abundances, in addition to the IMF. In this paper, we use new high signal-to-noise IMACS (Magellan) spectra to study the elliptical shell galaxy NGC 3923 at optical (3700–6600 Å) and near-infrared (7900–8500 Å) wavelengths, as a function of radius. We have undertaken a number of independent approaches to better understand the uncertainties in our results. (1) We compare two different stellar population model libraries; (2) we undertake spectral index fitting as well as full spectral fitting; (3) we have performed simulations for which we a priori know the input IMF and that closely match our data; (4) we also investigate the effects of including a two-component rather than a single stellar population. We show that our results are sensitive to the assumptions we make and to the methods we use. In addition, we evaluate the accuracy and precision of our results based on simulated mock data. We find some indication (although assumption dependent) for a bottom-heavy IMF in the mass range 0.5–1.0 M
⊙, while the IMF in the mass range 0.08–0.5 M
⊙ appears to be Milky Way–like and constant. Including near-infrared data in our analysis gives consistent results and improves the precision.
Magnetospheric Multiscale Observations of Foreshock Transients at Their Very Early Stage
Authors: Liu Terry Z. , An Xin , Zhang Hui , Turner Drew 
Published: October 2020

Abstract
Foreshock transients are ion kinetic structures in the ion foreshock. Due to their dynamic pressure perturbations, they can disturb the bow shock and magnetosphere–ionosphere system. They can also accelerate particles contributing to shock acceleration. However, it is still unclear how exactly they form. Recent particle-in-cell simulations point out the important role of the electric field and Hall current in the formation process. To further examine this, we use data from the Magnetospheric Multiscale (MMS) mission to apply case studies on two small (1000–2000 km) foreshock transient events that just started to form. In event 1 where MMS was in a tetrahedral formation, we show that the current density configuration, which determined the magnetic field profile, was mainly driven by Hall currents generated by demagnetized foreshock ions. The resulting time variation of the magnetic field induced an electric field that drove cold plasma moving outward with magnetic field lines. In event 2 where MMS was in a string-of-pearls formation, we analyze the evolution of field and plasma parameters. We show that the magnetic flux and mass flux were transported outward from the core, resulting in the steepening of the boundary. The steepened boundary, which trapped more foreshock ions and caused stronger demagnetization of foreshock ions, nonlinearly further enhanced the Hall current. Based on our observations, we propose a physical formation process wherein the positive feedback of foreshock ions on the varying magnetic field caused by the foreshock ion Hall current enables an “instability” and the growth of the structure.
Disk Illumination and Jet Variability of the Herbig Ae Star HD 163296 Using Multi-epoch HST/STIS Optical, Near-IR, and Radio Imagery and Spectroscopy
Authors: Rich Evan A. , Wisniewski John P. , Sitko Michael L. , Grady Carol A. , Tobin John J. , Fukagawa Misato 
Published: October 2020

Abstract
We present two new epochs of Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph coronagraphic imaging, along with multi-epoch optical, near-IR, and radio monitoring, of the HD 163296 system. We find that ansae features identified in earlier-epoch HST imagery are a fourth ring that resides at a semimajor axis distance of 3.″25 (330 au). We determine that the scale height of the dust is 64 au at a radial distance of 330 au. We observe surface brightness variations in the fourth ring on <3 month timescales, including large-scale, azimuthally asymmetric changes. This variability resembles earlier studies of the innermost disk ring (0.″66, 67 au), suggesting a common origin. We find no evidence for the ejection of new HH knots predicted to occur in 2018. Moreover, our nondetection of older HH knots indicates that the knots could be experiencing less shock heating. We also detect one clear dipper event in our optical light curve from 2018. Using the timescale and spatial extent of the disk illumination changes we observe, we estimate that the source of this shadowing resides within 0.5 au from the star, must extend at least 0.08 au above the midplane of the disk, and has an azimuthal extent of 0.26 au. We estimate that the source of the dipper event reaches a scale height of 0.37 au above the midplane at 0.41 au and has an azimuthal extent of 0.3 au. We suggest that these similarities could indicate that the same (or similar) mechanisms are responsible for producing both dippers and variable ring illumination in the system.
The Relative Emission from Chromospheres and Coronae: Dependence on Spectral Type and Age*
Authors: Linsky Jeffrey L. , Wood Brian E. , Youngblood Allison , Brown Alexander , Froning Cynthia S. , France Kevin , Buccino Andrea P. , Cranmer Steven R. , Mauas Pablo , Miguel Yamila , Pineda J. Sebastian , Rugheimer Sarah , Vieytes Mariela , Wheatley Peter J. , Wilson David J. 
Published: October 2020

Abstract
Extreme-ultraviolet and X-ray emission from stellar coronae drives mass loss from exoplanet atmospheres, and ultraviolet emission from stellar chromospheres drives photochemistry in exoplanet atmospheres. Comparisons of the spectral energy distributions of host stars are, therefore, essential for understanding the evolution and habitability of exoplanets. The large number of stars observed with the MUSCLES, Mega-MUSCLES, and other recent Hubble Space Telescope observing programs has provided for the first time a large sample (79 stars) of reconstructed Lyα fluxes that we compare with X-ray fluxes to identify significant patterns in the relative emission from these two atmospheric regions as a function of stellar age and effective temperature. We find that as stars age on the main sequence, the emissions from their chromospheres and coronae follow a pattern in response to the amount of magnetic heating in these atmospheric layers. A single trend-line slope describes the pattern of X-ray versus Lyα emission for G and K dwarfs, but the different trend lines for M dwarf stars show that the Lyα fluxes of M stars are significantly smaller than those of warmer stars with the same X-ray flux. The X-ray and Lyα luminosities divided by the stellar bolometric luminosities show different patterns depending on stellar age. The L(Lyα)/L(bol) ratios increase smoothly to cooler stars of all ages, but the L(X)/L(bol) ratios show different trends. For older stars, the increase in coronal emission with decreasing

is much steeper than that of chromospheric emission. We suggest a fundamental link between atmospheric properties and trend lines relating coronal and chromospheric heating,
Spectral Variability of the Blazar 3C 279 in the Optical to X-Ray Band during 2009–2018
Authors: Yoo Sungmin , An Hongjun 
Published: October 2020

Abstract
We report on the spectral variability of the blazar 3C 279 in the optical to X-ray band between MJD 55100 and 58400 during which long-term radio variability was observed. We construct light curves and band spectra in each of the optical (2 × 1014–1.5 × 1015 Hz) and X-ray (0.3–10 keV) bands, measure the spectral parameters (flux F and spectral index α), and investigate the correlation between F and α within and across the bands. We find that the correlation of the optical properties dramatically change after ∼MJD 55500 and the light curves show more frequent activity after ∼MJD 57700. We therefore divide the time interval into three “states” based on the correlation properties and source activity in the light curves, and analyze each of the three states separately. We find various correlations between the spectral parameters in the states and an intriguing 65 day delay of the optical emission with respect to the X-ray one in state 2 (MJD 55500–57700). We attempt to explain these findings using a one-zone synchro-Compton emission scenario.
NICER Observation of the Temporal and Spectral Evolution of Swift J1818.0−1607: A Missing Link between Magnetars and Rotation-powered Pulsars
Authors: Hu Chin-Ping , Begiçarslan Beste , Güver Tolga , Enoto Teruaki , Younes George , Sakamoto Takanori , Ray Paul S. , Strohmayer Tod E. , Guillot Sebastien , Arzoumanian Zaven , Palmer David M. , Gendreau Keith C. , Malacaria C. , Wadiasingh Zorawar , Jaisawal Gaurava K. , Majid Walid A. 
Published: October 2020

Abstract
We report on the hard X-ray burst and the first ∼100 days of NICER monitoring of the soft X-ray temporal and spectral evolution of the newly discovered magnetar Swift J1818.0−1607. The burst properties are typical of magnetars with a duration of T
90 = 10 ± 4 ms and a temperature of kT = 8.4 ± 0.7 keV. The 2–8 keV pulse shows a broad, single-peak profile with a pulse fraction increasing with time from 30% to 43%. The NICER observations reveal strong timing noise with

varying erratically by a factor of 10, with an average long-term spin-down rate of

s−2, implying an equatorial surface magnetic field of 2.5 × 1014 G and a young characteristic age of ∼470 yr. We detect a large spin-up glitch at MJD 58928.56 followed by a candidate spin-down glitch at MJD 58934.81, with no accompanying flux enhancements. The persistent soft X-ray spectrum of Swift J1818.0−1607 can be modeled as an absorbed blackbody with a temperature of ∼1 keV. Its flux decayed by ∼60% while the modeled emitting area decreased by ∼30% over the NICER observing campaign. This decrease, coupled with the increase in the pulse fraction, points to a shrinking hot spot on the neutron star surface. Assuming a distance of 6.5 kpc, we measure a peak X-ray luminosity of 1.9 × 1035 erg s−1, lower than its spin-down luminosity of 7.2 × 1035 erg s−1. Its quiescent thermal luminosity is ≲1.7 × 1034 erg s−1, lower than those of canonical young magnetars. We conclude that Swift J1818.0−1607 is an important link between regular magnetars and high-magnetic-field, rotation-powered pulsars.
Waterworlds May Have Better Climate Buffering Capacities than Their Continental Counterparts
Authors: Hayworth Benjamin P. C. , Foley Bradford J. 
Published: October 2020

Abstract
The long-term habitability of a planet is often assumed to be controlled by its ability to cycle carbon between the solid planetary interior and atmosphere. This process allows the planet to respond to external forcings (i.e., changes in insolation, changes in volcanic outgassing rates, etc.) and regulate its surface temperature through negative feedbacks on atmospheric CO2 involved in silicate weathering. Continental weathering and seafloor weathering rates have different, non-linear dependencies on pCO2 and will respond differently to changes in external forcings. Because waterworlds (planets with only seafloor weathering) have a weaker pCO2 dependence than continental worlds (such as modern Earth), we find that waterworlds are better at resisting changes in surface temperature resulting from perturbations in insolation than their continental counterparts, and may be more habitable in this respect.