cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Skalierbare Themen im Mathematikunterricht
Creators: name: Hungerbühler, Norbert
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2015
Subjects: subject: 510

description: Es ist ein herausfordernder Gedanke, den Mathematikunterricht entlang der gesamten Schullaufbahn vom Kindergarten bis zur Hochschule zu denken, sowohl didaktisch, wie auch inhaltlich. Sind wir als Lehrende überhaupt bereit, über den gepflegten Garten der eigenen Schulstufe hinauszuschauen? Kennen wir die darunter- und die darüberliegende Stufe gut genug, um die Übergänge nicht zu Klippen werden zu lassen, die Schülerinnen und Schüler unten abzuholen, wo sie sind und oben adäquat vorzubereiten? Pflegen wir den didaktischen und den inhaltlichen Dialog mit den Lehrkräften der anderen Schulstufen? Dieser Text möchte einige Anregungen geben, diesen Dialog zu führen.
Spontaneous concentrations of solids through two-way drag forces between gas and sedimenting particles
Creators: name: Lambrechts, Michiel
name: Johansen, Anders
name: Capelo, Holly L.
name: Blum, Jürgen
name: Bodenschatz, Eberhard
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The behaviour of sedimenting particles depends on the dust-to-gas ratio of the fluid. Linear stability analysis shows that solids settling in the Epstein drag regime would remain homogeneously distributed in non-rotating incompressible fluids, even when dust-to-gas ratios reach unity. However, the non-linear evolution has not been probed before. Here, we present numerical calculations indicating that in a particle-dense mixture solids spontaneously mix out of the fluid and form swarms overdense in particles by at least a factor 10. The instability is caused by mass-loaded regions locally breaking the equilibrium background stratification. The driving mechanism depends on non-linear perturbations of the background flow and shares some similarity to the streaming instability in accretion discs. The resulting particle-rich swarms may stimulate particle growth by coagulation. In the context of protoplanetary discs, the instability could be relevant for aiding small particles to settle to the midplane in the outer disc. Inside the gas envelopes of protoplanets, enhanced settling may lead to a reduced dust opacity, which facilitates the contraction of the envelope. We show that the relevant physical set up can be recreated in a laboratory setting. This will allow our numerical calculations to be investigated experimentally in the future.
description: Accepted for publication in Astronomy and Astrophysics
title: Die Neuroborreliose als wichtige Differentialdiagnose einer Essstörung
Creators: name: Weiner, Viktoria
name: Biester, Torben
name: Datz, Nicolin
name: Christen, Hans-Jürgen
name: Kordonouri, Olga
Publisher: name: German Medical Science GMS Publishing House
Year: 2016
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Gewichtsverlust im Jugendalter kann somatische und psychiatrische Ursachen haben. Bei adoleszenten Mädchen ist er häufig durch eine Essstörung bedingt. Im Alter von 11 bis 17 Jahren zeigt ein Fünftel aller Jugendlichen Hinweise auf ein gestörtes Essverhalten. [zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 65. Jahrestagung der Norddeutschen Gesellschaft für Kinder- und Jugendmedizin (NDGKJ)
Ελευθερία έκφρασης (διαδίκτυο- δημόσια πρόσωπα)
Creators: name: Μιχαήλος, Νικόλαος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Ελευθερία έκφρασης
Διαδίκτυο
Δημόσια πρόσωπα
Freedom of expression
Internet
Public issues

description: Σκοπός της διατριβής ήταν η μελέτη του ζητήματος της ελευθερίας έκφρασης, όπως κατοχυρώνεται συνταγματικά και προστατεύεται σε διεθνείς συμβάσεις . Εξετάσαμε την ορολογία που χρησιμοποιείται, τους ορισμούς που έχουν προταθεί και τη νομολογία που αναπτύσσεται. Στη συνέχεια παρουσιάσαμε αναλυτικά τα χαρακτηριστικά της ελευθερίας έκφρασης, καθώς και τους περιορισμούς που ισχύουν. Ακόμη αναφερθήκαμε αναλυτικά στα μοντέλα κατανόησης της ελευθερίας έκφρασης που έχουν προταθεί και μας απασχόλησε η κατανόηση των διαφορετικών απόψεων σε Ευρώπη και ΗΠΑ και η νομολογία των ανωτάτων δικαστηρίων( ΕΔΔΑ, Supreme Court). Επιπλέον, αναφερθήκαμε στο θέμα των δημοσίων προσώπων και το διαφορετικό καθεστώς για αυτούς. Επίσης, εξετάσαμε τι ισχύει στο διαδίκτυο και τι αλλαγές προκαλεί. Ασχοληθήκαμε επιπλέον με την ιστορική διάσταση της ελευθερίας έκφρασης και διαπιστώσαμε την παρουσία της από την αρχαιότητα μέχρι σήμερα.
description: The aim of the present thesis was the study of freedom of expression’s issue, as constitutionally enshrined and protected in international conventions . We examined the proposed terminology, the definitions given and the jurisprudence developed for freedom of speech. Then we presented the features of freedom of speech and the restrictions that apply. Furthermore, we analyzed the models concerning the comprehension of freedom of speech and we examined the different points of view in Europe and USA and the jurisprudence of their supreme courts ( ECHR, Supreme Court).In addition, we referred to the issue of public figures and the different status for them. We looked at what is happening on the internet and what changes it is causing Another aim of this study was to examine the historical dimension of freedom of speech .
Spinor Lie derivatives and Fermion stress-energies
Creators: name: Helfer, Adam D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Stress-energies for Fermi fields are derived from the principle of general covariance. This is done by developing a notion of Lie derivatives of spinors along arbitrary vector fields. A substantial theory of such derivatives was first introduced by Kosmann; here I show how an apparent conflict in the literature on this is due to a difference in the definitions of spinors, and that tracking the Lie derivative of the Infeld-van der Waerden symbol, as well as the spinor fields under consideration, gives a fuller picture of the geometry and leads to the Fermion stress-energy. The differences in the definitions of spinors do not affect the results here, but could matter in certain quantum-gravity programs and for spinor transformations under discrete symmetries.
description: 25 pages, to appear in Proc. R. Soc. A
Miconia schlimii Triana
Creators: name: Alvear, Marcela
name: Ocampo, Gilberto
name: Parra-O, Carlos
name: Almeda, Eduino Carbonó And Frank
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Myrtales
Melastomataceae
Miconia
Miconia schlimii

description: Miconia schlimii Triana
 Type: Colombia, Schlim 903 (ST: BM; IST: BR, K, MPU).
Tree. Caribbean lowlands, Pacific lowlands, SNSM. 0– 500 m.
Dept.: CHO, MAG.
Distr.: Mesoamerica to Colombia and Venezuela.
 Voucher: Smith 13 (US).
description: Published as part of Alvear, Marcela, Ocampo, Gilberto, Parra-O, Carlos & Almeda, Eduino Carbonó And Frank, 2015, Melastomataceae of the Sierra Nevada de Santa Marta (Colombia): floristic affinities and annotated catalogue, pp. 1-30 in Phytotaxa 195 (1) on page 26, DOI: 10.11646/phytotaxa.195.1.1, http://zenodo.org/record/13641153
Solid - Liquid Phase Transition in a Gibbs Monolayer of Melissic Acid at the n-Hexane - Water Interface
Creators: name: Tikhonov, Aleksey M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A sharp phase transition from a crystalline state with the area per molecule A = (17 +/- 1) Angstrom^2 to a liquid state with A = (23 +/- 1) Angstrom^2 at the n-hexane - water interface in a Gibbs monolayer of melissic acid has been revealed in data of X-ray reflectometry with the use of synchrotron radiation.
description: 11 pages, 7 figures
Kurzes Tutorium Statistik – Kurzvideos auf YouTube
Creators: name: Baertl, Mathias
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2015
Subjects: subject: 510

description: Sowohl Angebot als auch Nachfrage nach Videos mit Lehrinhalt verzeichnen aktuell ein nahezu explosionsartiges Wachstum; MOOCs machen dabei jedoch nur einen geringen Anteil aus. Während Studierende einen positiven Effekt von Lehrvideos auf den eigenen Lernerfolg wahrnehmen, ist dieser bei objektiver Prüfung jedoch oft nicht nachweisbar. Für Dozenten eröffnet dies ein Spannungsfeld, für dessen Lösung dieser Beitrag die im Selbstversuch erprobte Möglichkeit der Produktion von Kurzvideos und deren Veröffentlichung auf YouTube vorstellt.
A CRIRES-search for H3+ emission from the hot Jupiter atmosphere of HD 209458 b
Creators: name: Lenz, Lea
name: Reiners, Ansgar
name: Seifahrt, Andreas
name: Kaeufl, Hans-Ulrich
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Close-in extrasolar giant planets are expected to cool their thermospheres by producing H3+ emission in the near-infrared (NIR), but simulations predict H3+ emission intensities that differ in the resulting intensity by several orders of magnitude. We want to test the observability of H3+ emission with CRIRES at the Very Large Telescope (VLT), providing adequate spectral resolution for planetary atmospheric lines in NIR spectra. We search for signatures of planetary H3+ emission in the L` band, using spectra of HD 209458 obtained during and after secondary eclipse of its transiting planet HD 209458 b. We searched for H3+ emission signatures in spectra containing the combined light of the star and, possibly, the planet. With the information on the ephemeris of the transiting planet, we derive the radial velocities at the time of observation and search for the emission at the expected line positions and search for planetary signals and use a shift and add technique combining all observed spectra taken after sec. eclipse to calculate an upper emission limit. We do not find signatures of atmospheric H3+ emission in the spectra containing the combined light of HD 209458 and planet b. We calculate the emission limit for the H3+ line at 3953.0 nm (Q(1, 0)) to be 8.32 E18W and a limit of 5.34E18 W for the line at 3985.5 nm (Q(3, 0)). Comparing our emission limits to the theoretical predictions suggests that we lack 1 to 3 magnitudes of sensitivity to measure H3+ emission in our target object. We show that under more favorable weather conditions the data quality can be improved significantly, reaching 5 E16W for star-planet systems that are close to Earth. We estimate that pushing the detection limit down to 1E15W will be possible with ground-based observations with future instrumentation, for example, the E-ELT.
description: 7 pages, Astronomy & Astrophysics accepted
Fortalecimiento de la competencia resolución de problemas matemáticos en estudiantes de grado tercero a través de los Recursos Educativos Digitales en la plataforma Moodle
Creators: name: Ruiz Guzmán, Diomedes De Jesús
Publisher: name: Universidad de Cartagena
Year: 2021
Subjects: subject: Tecnología educativa
subject: Sitios web educativos
subject: Matemáticas - Enseñanza

description: Esta investigación definió como objetivo fortalecer el desarrollo de la competencia Resolución de Problemas Matemáticos en estudiantes de grado tercero de la institución educativa Rafael Núñez, mediante la aplicación una estrategia basada en el uso de Recursos Educativos Digitales en la plataforma Moodle. La investigación se fundamentó en un tipo de investigación cualitativo con un modelo de investigación acción pedagógica IAP. El proceso metodológico tuvo 3 fases: diagnostico, diseño, implementación y evaluación en donde se utilizaron los instrumentos pretest, diario de campo y postest. El resultado del diagnóstico evidenció que los estudiantes presentaban dificultades en la resolución de problemas matemáticos, además los docentes implementaban pocos recursos educativos digitales en su práctica pedagógica. Esto motivo al diseño de una estrategia basada en el uso de recursos educativos digitales para fortalecer la competencia resolución de problemas matemáticos. La cual se implementó con 2 secuencias didácticas que mejoraron el desempeño de los estudiantes y transformaron el ejercicio docente en el aula, ya que se incluyeron recursos de gran interés para los estudiantes. Es decir, la implementación de los recursos educativos digitales en los procesos educativos acarrea múltiples beneficios tanto para los estudiantes como para los docentes
WYWEB: A NLP Evaluation Benchmark For Classical Chinese
Creators: name: Zhou, Bo
name: Chen, Qianglong
name: Wang, Tianyu
name: Zhong, Xiaomi
name: Zhang, Yin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: To fully evaluate the overall performance of different NLP models in a given domain, many evaluation benchmarks are proposed, such as GLUE, SuperGLUE and CLUE. The fi eld of natural language understanding has traditionally focused on benchmarks for various tasks in languages such as Chinese, English, and multilingua, however, there has been a lack of attention given to the area of classical Chinese, also known as "wen yan wen", which has a rich history spanning thousands of years and holds signifi cant cultural and academic value. For the prosperity of the NLP community, in this paper, we introduce the WYWEB evaluation benchmark, which consists of nine NLP tasks in classical Chinese, implementing sentence classifi cation, sequence labeling, reading comprehension, and machine translation. We evaluate the existing pre-trained language models, which are all struggling with this benchmark. We also introduce a number of supplementary datasets and additional tools to help facilitate further progress on classical Chinese NLU. The github repository is https://github.com/baudzhou/WYWEB.
description: Accepted by ACL 2023
Problemas de comportamiento y estrés emocional en escolares con bruxismo
Creators: name: Álvarez Bettin, Juan Manuel
name: Rodelo Calvo, Rodrigo Alfonso
Publisher: name: Universidad de Cartagena
Year: 2014
Subjects: Odontólogos
Odontología como profesión
Niños - Salud e higiene
Medicina oral

description: Tesis (Odontólogo). -- Universidad de Cartagena. Facultad de Odontología. Departamento de Investigación, 2014
description: El propósito de este estudio fue demostrar la relación existente entre los problemas de comportamiento y estrés emocional en niños con bruxismo, realizado en un colegio de la zona sur oriental de la ciudad de Cartagena, con un total de 200 muestras. Se le aplicó el instrumento a los padres o tutores legales la escala de Comportamiento Preescolar y Jardín Infantil (Preschool and Kindergarten Behavior Scales - PKBS) el cuál evalúa problemas de conducta en niños de 3 a 7 años, pero se decidió aplicar en niños de 7 a 12 años, además se aplicó el Inventario Infantil de Estresores Cotidiano (IIEC). Para la evaluación clínica se aplicó la clasificación del grado de bruxismo mediante 15 signos y síntomas propuesta por Molina, dos Santos, Nelson, y Nowlin en 1999. Se obtuvo un bajo índice de bruxismo en la muestra, encontrándose una importante relación entre el mal comportamiento y el padecimiento de esta patología.; sin embargo, no hubo una significativa relevancia de la presencia de estrés y bruxismo.
Entstehung mathematikbezogener Angst zu Beginn der Sekundarstufe I
Creators: name: Beier, Frances
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2015
Subjects: subject: 510

description: Die Mathematik ist eine sehr anschauliche, anwendungsbezogene und logische Disziplin. Trotzdem entwickeln viele Schülerinnen und Schüler (SuS) mathematikbezogene Angst während ihrer Schullaufbahn (Gierl, Bisanz 1995). Hier setzt das Ziel dieser Studie an: Es sollen Einflussfaktoren untersucht werden, welche die Entstehung mathematikbezogener Angst zu Beginn der Sekundarstufe I bedingen können.
Miconia shattuckii Standl.
Creators: name: Alvear, Marcela
name: Ocampo, Gilberto
name: Parra-O, Carlos
name: Almeda, Eduino Carbonó And Frank
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Myrtales
Melastomataceae
Miconia
Miconia shattuckii

description: Miconia shattuckii Standl.
 Type: Panama, Shattuck 335 (HT: F; IT: F, MO).
Shrub, Small tree. Caribbean lowlands, Pacific lowlands, SNSM. 200– 820 m.
Dept.: ANT, CHO, MAG.
Distr.: Mesoamerica to Colombia.
 Voucher: Lozano 3799 (COL).
description: Published as part of Alvear, Marcela, Ocampo, Gilberto, Parra-O, Carlos & Almeda, Eduino Carbonó And Frank, 2015, Melastomataceae of the Sierra Nevada de Santa Marta (Colombia): floristic affinities and annotated catalogue, pp. 1-30 in Phytotaxa 195 (1) on page 26, DOI: 10.11646/phytotaxa.195.1.1, http://zenodo.org/record/13641153
Effects of magnetic field and twin domains on magnetostructural phase mixture in Mn3O4: Raman scattering studies of untwinned crystals
Creators: name: Byrum, T.
name: Gleason, S. L.
name: Thaler, A.
name: MacDougall, G. J.
name: Cooper, S. L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The ferrimagnetic spinel Mn3O4 exhibits large and anisotropic changes in electronic and structural properties in response to an applied magnetic field. These changes are thought to result from the field-dependent tuning---via strong spin-lattice coupling---between two nearly degenerate magnetostructural phases. Recent variable-magnetic-field studies of Mn3O4 have been performed on melt-grown crystals, which can exhibit twin domains due to a Jahn-Teller structural transition below the melting temperature. Because of the near degeneracy of the magnetostructural phases, however, strain associated with the twin domains likely affects the magnetic responses of Mn3O4. In this report, we present a variable-magnetic-field Raman scattering study of untwinned Mn3O4 crystals grown out of a flux below the Jahn-Teller structural transition. We measure distinct q = 0 magnetic and vibrational excitation spectra for each isolated magnetostructural phase of untwinned Mn3O4 crystals and determine the symmetries of the observed excitations. We determine how the magnetostructural phase mixture changes in response to magnetic fields applied in the magnetic easy plane. Lastly, by comparing results on flux- and melt-grown Mn3O4 crystals, we show that the intrinsic mixture of the two magnetostructural phases is indeed strongly influenced by the presence of twin domains.
Nonsmooth optimality criterion for a $\mathrm{W}^{1,2}$-controlled sweeping process: Nonautonomous perturbation
Creators: name: Nour, Chadi
name: Zeidan, Vera
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We extend to $\mathrm{C}\times \mathrm{W}^{1,2}$-local minimizers and nonautonomous perturbation function, the necessary optimality conditions derived in [1], via continuous-time approximations, for $\mathrm{W}^{1,2}\times \mathrm{W}^{1,2}$-local minimizers of an optimal control problem governed by a controlled nonconvex sweeping process with autonomous perturbation function.
description: arXiv admin note: text overlap with arXiv:2301.00475
Leveraging Human Feedback to Evolve and Discover Novel Emergent Behaviors in Robot Swarms
Creators: name: Mattson, Connor
name: Brown, Daniel S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Multiagent Systems (cs.MA)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Robot swarms often exhibit emergent behaviors that are fascinating to observe; however, it is often difficult to predict what swarm behaviors can emerge under a given set of agent capabilities. We seek to efficiently leverage human input to automatically discover a taxonomy of collective behaviors that can emerge from a particular multi-agent system, without requiring the human to know beforehand what behaviors are interesting or even possible. Our proposed approach adapts to user preferences by learning a similarity space over swarm collective behaviors using self-supervised learning and human-in-the-loop queries. We combine our learned similarity metric with novelty search and clustering to explore and categorize the space of possible swarm behaviors. We also propose several general-purpose heuristics that improve the efficiency of our novelty search by prioritizing robot controllers that are likely to lead to interesting emergent behaviors. We test our approach in simulation on two robot capability models and show that our methods consistently discover a richer set of emergent behaviors than prior work. Code, videos, and datasets are available at https://sites.google.com/view/evolving-novel-swarms.
description: 13 pages, 10 figures, To be published in Proceedings Genetic and Evolutionary Computation Conference (GECCO 2023)
La huelga, instrumento de lucha obrera
Creators: name: Cogollo Lujan, Elizabeth
Publisher: name: Universidad de Cartagena
Year: 1974
Subjects: Huelgas

description: Tesis (Abogado) -- Universidad de Cartagena. Facultad de Derecho y Ciencias Políticas. Programa de Derecho, 1974
description: Con la solidaridad sindical se marca, un paso decisivo en la lucha, porque no se permite vender la fuerza del trabajo y por ella se unifica para hacer la huelga general y solidaria, donde la acción obrera toma fuerza y permite mejores resultados.
Miconia spinulosa Naudin
Creators: name: Alvear, Marcela
name: Ocampo, Gilberto
name: Parra-O, Carlos
name: Almeda, Eduino Carbonó And Frank
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Myrtales
Melastomataceae
Miconia
Miconia spinulosa

description: Miconia spinulosa Naudin
 Type: Venezuela, Funck 96 (HT: P; IT: BM, BR, P).
Shrub, Small tree. Andes, SNSM. 1000–2400 m.
Dept.: CUN, MAG, NSA, SAN.
Distr.: Colombia, Venezuela.
 Voucher: Kirkbride 2019 (COL, US).
description: Published as part of Alvear, Marcela, Ocampo, Gilberto, Parra-O, Carlos & Almeda, Eduino Carbonó And Frank, 2015, Melastomataceae of the Sierra Nevada de Santa Marta (Colombia): floristic affinities and annotated catalogue, pp. 1-30 in Phytotaxa 195 (1) on page 27, DOI: 10.11646/phytotaxa.195.1.1, http://zenodo.org/record/13641153
title: Pre-clinical assessment of the Phoenix99 Retina Implant – passive performance in vivo
Creators: name: Suaning, Gregg
name: Lovell, N.
name: James, N.
name: Fung, A.
Publisher: name: German Medical Science GMS Publishing House
Year: 2016
Subjects: subject: 610 Medical sciences; Medicine

description: Objective: To assess the passive, in vivo performance of a visual prosthesis comprising 98 stimulation electrodes on an array placed within the supra-choroidal space, a small hermetic capsule containing a single microchip and monopolar return electrode fixed to the globe, and a flexible lead wire leading[for full text, please go to the a.m. URL]
description: Artificial Vision 2015
Diagnostico sobre la gestión de las entidades micro financieras en la asignación de microcréditos productivos a mujeres cabeza de familia microempresarias de la ciudad de Cartagena
Creators: name: Porto Pérez, Ana
name: Yepes Rhenals, Jessi
Publisher: name: Universidad de Cartagena
Year: 2011
Subjects: Microfinanzas
Microcrédito
Servicios financieros

description: Tesis (Administrador de Empresas).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 2011
description: Actualmente, en Colombia, el sistema de crédito no tradicional ha empezado a expandirse a los sectores carenciados y exceptuados del sistema bancario tradicional, surgiendo un sistema de financiación denominado microcrédito, el cual tiene como meta fundamental aliviar económicamente a la población en situación de pobreza y transformar la estructura socioeconómica de los sectores vulnerables, a través de un incremento en sus niveles de ingresos y el apoyo a la realización de microempresas. El objetivo de este trabajo consiste en hacer un diagnóstico sobre la gestión de las entidades micro financieras en la asignación de microcréditos productivos a mujeres cabeza de familia microempresarias en la ciudad de Cartagena.
A Subluminal Relativistic Magnetohydrodynamics Scheme with ADER-WENO Predictor and Multidimensional Riemann Solver-Based Corrector
Creators: name: Balsara, Dinshaw S.
name: Kim, Jinho
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The relativistic magnetohydrodynamics (RMHD) set of equations has recently seen increased use in astrophysical computations. Even so, RMHD codes remain fragile. The reconstruction can sometimes yield superluminal velocities in certain parts of the mesh. In this paper we present a reconstruction strategy that overcomes this problem by making a single conservative to primitive transformation per cell followed by higher order WENO reconstruction on a carefully chosen set of primitives that guarantee subluminal reconstruction of the flow variables. For temporal evolution via a predictor step we also present second, third and fourth order accurate ADER methods that keep the velocity subluminal during the predictor step. The RMHD system also requires the magnetic field to be evolved in a divergence-free fashion. In the treatment of classical numerical MHD the analogous issue has seen much recent progress with the advent of multidimensional Riemann solvers. By developing multidimensional Riemann solvers for RMHD, we show that similar advances extend to RMHD. As a result, the face-centered magnetic fields can be evolved much more accurately using the edge-centered electric fields in the corrector step. Those edge-centered electric fields come from a multidimensional Riemann solver for RMHD which we present in this paper. In this paper we also develop several new test problems for RMHD. We show that RMHD vortices can be designed that propagate on the computational mesh as self-preserving structures. These RMHD vortex test problems provide a means to do truly multidimensional accuracy testing for RMHD codes. Several other stringent test problems are presented. We show the importance of resolution in certain test problems. Our tests include a demonstration that RMHD vortices are stable when they interact with shocks.
description: 67 pages, 9 figures, accepted for publication in Journal of Computational Physics
Effects of the resonant magnetic perturbation on turbulent transport
Creators: name: Vlad, Madalina
name: Spineanu, Florin
Publisher: name: arXiv
Year: 2015
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The effects of the resonant magnetic perturbations (RMPs) on the turbulent transport are analyzed in the framework of the test particle approach using a semi-analytical method. The normalized RMP amplitude $P_{b}$ extends on a large range, from the present experiments to ITER conditions. The results are in agreement with the experiments at small $P_{b}.$ The predictions for ITER strongly depend on the type of turbulent transport. A very strong increase of the turbulent transport is obtained in the nonlinear regime, while the effects of the RMPs are much weaker for the quasilinear transport.
description: Extended version of the work presented at the "597. WE-Heraeus-Seminar: Stochasticity in Fusion Plasma" (Bad-Honnef, 2015)
Short-Time Elasticity of Polymer Melts: Tobolsky Conjecture and Heterogeneous Local Stiffness
Creators: name: Bernini, S.
name: Leporini, D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: An extended Molecular-Dynamics study of the short-time "glassy" elasticity exhibited by a polymer melt of linear fully-flexible chains above the glass transition is presented. The focus is on the infinite-frequency shear modulus $G_\infty$ manifested in the picosecond time scale and the relaxed plateau $G_p$ reached at later times and terminated by the structural relaxation. The local stiffness of the interactions with the first neighbours of each monomer exhibits marked distribution with average value given by $G_\infty$. In particular, the neighbourhood of the end monomers of each chain are softer than the inner monomers, so that $G_\infty$ increases with the chain length. $G_p$ is not affected by the chain length and is largely set by the non-bonding interactions, thus confirming for polymer melts the conjecture formulated by Tobolsky for glassy polymers.
description: 18 pages, 6 figures
Formato de Presentación de Tesis/Seminarios de Grado
Creators: name: Rebolledo, Alexis
Publisher: name: figshare
Year: 2022
Subjects: subject: 130205 Humanities and Social Sciences Curriculum and Pedagogy (excl. Economics, Business and Management)
subject: FOS: Educational sciences
subject: 160808 Sociology and Social Studies of Science and Technology
subject: FOS: Sociology
subject: 160807 Sociological Methodology and Research Methods
subject: Education

description: En este documento propongo una estructura para organizar los distintos apartados que deben redactar en un informe de investigación, sea cuantitativo, cualitativo, o con algún nivel de integración metodológica.
title: Evaluation of Neuronal Stimulation Methods for Retinal Bipolar Cells Including New Pulse Density Modulated, Charge Controlled Stimulation Approach
Creators: name: Raffelberg, Pascal
name: Marzouk, A.M.
name: Schüttler, D.
name: Viga, R.
name: Kokozinski, R.
Publisher: name: German Medical Science GMS Publishing House
Year: 2016
Subjects: subject: 610 Medical sciences; Medicine

description: Objective: To compare the pulse density modulated, switched capacitor based stimulation (PDM-SCS) approach, developed by Marzouk et al., to the voltage and current controlled stimulation (VCS respectively CCS). Materials and Methods: Two of the main methods of electrical stimulation for retinal bipolar[for full text, please go to the a.m. URL]
description: Artificial Vision 2015
Die Bedeutung organisierter oppositioneller Gruppen und Richtungen in der Kirche
Creators: name: Tamayo-Acosta, Juan José
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 18 Nr. 10 (1982): Concilium: Internationale Zeitschrift für Theologie, Band 18, Heft 10
Campodea (Campodea) rhopalota Denis 1930
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Campodea
Campodea rhopalota

description: Campodea (Campodea) rhopalota Denis, 1930
Figs 30, 48
Campodea (Campodea) rhopalota Denis, 1930: 23, figs 1–6.
Diagnosis (Denis 1930; Bareth 2006)
Body length 4.0–5.0 mm; epicuticle with microdenticles; middle-sized clothing setae with a few barbs; antennae 21–24 antennomeres; sensillum of third antennomere in dorsal position; short (ma, la) and long (lp) robust barbed notal macrosetae; thin pine cone notal marginal setae; 0 or 1+1 ma macrosetae or sma submacrosetae on I–VII urotergites; 1+1 la on V, 1+1 la, 1+1 lp on VI–VII, 1+1 mp, 3+3 lp on VIII and 1+1 mp, 5+5 lp on IX abdominal segment; male with two separated areas of glandular g 1 -setae; cerci with 7–8 articles covered in long macrosetae with distal barbs but swollen latero-interior macrosetae on proximal articles and a few clothing setae; spermatozoid fascicles with 55–60 μm diameter and 20–25 μm thick, spiral filament with 2½ to 3 spirals, 350–400 μm long and round section 1.5 μm in diameter.
Taxonomic notes
The studied material (Supplementary file 2) has allowed to draw the nota (Fig. 48).
Habitat and distribution
Soil-dwelling species spreading from the Langres Plateau in northeast France near the French Pyrenees (Denis 1930; Husson 1946; Condé 1947h; Pagés 1951), through the Swiss to eastern Austrian Alps (Wygodzinsky 1941b; Christian 1992).
description: Published as part of Sendra, Alberto & Reboleira, Ana Sofia P. S., 2020, Euro-Mediterranean fauna of Campodeinae (Campodeidae, Diplura), pp. 1-130 in European Journal of Taxonomy 728 on page 54, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
Master equation as a radial constraint
Creators: name: Hussain, Uzair
name: Booth, Ivan
name: Kunduri, Hari K.
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit the problem of perturbations of Schwarzschild-AdS$_4$ black holes by using a combination of the Martel-Poisson formalism for perturbations of four-dimensional spherically symmetric spacetimes and the Kodama-Ishibashi formalism. We clarify the relationship between both formalisms and express the Brown-York-Balasubramanian-Krauss boundary stress-energy tensor, $\bar{T}_{μν}$, on a finite-$r$ surface purely in terms of the even and odd master functions. Then, on these surfaces we find that the spacelike components of the conservation equation $\bar{\mathcal{D}}^μ\bar{T}_{μν} =0$ are equivalent to the wave equations for the master functions. The renormalized stress-energy tensor at the boundary $\displaystyle \frac{r}{L} \lim_{r \rightarrow \infty} \bar{T}_{μν}$ is calculated directly in terms of the master functions.
description: 10 pages, RevTeX
El Informe de Tesis
Creators: name: Rebolledo, Alexis
Publisher: name: figshare
Year: 2020
Subjects: subject: 130205 Humanities and Social Sciences Curriculum and Pedagogy (excl. Economics, Business and Management)
subject: FOS: Educational sciences
subject: 160808 Sociology and Social Studies of Science and Technology
subject: FOS: Sociology
subject: 160807 Sociological Methodology and Research Methods
subject: Education

description: En este documento les propongo una estructura para organizar los distintos apartados que deben redactar en su informe de investigación, sea cuantitativo, cualitativo, o con algún nivel de integración metodológica.
Programa de atención psicosocial a niños, niñas y adolescentes en riesgo de explotación sexual comercial y abuso sexual que forman parte del proyecto "Edúcame primero Colombia" y su grupo familiar inmediato
Creators: name: Jiménez Ávila, Isabel
Publisher: name: Universidad de Cartagena
Year: 2008
Subjects: subject: Síndrome de maltrato infantil
subject: Trabajo social con niños
subject: Abuso sexual - Niños
subject: Riesgo (Salud ocupacional)
subject: Riesgos psicosociales
subject: Abuso del niño

description: Por medio de este informe se puede concluir que las visitas al medio social permitieron recolectar información, de aspectos importantes de la realidad de los menores beneficiarios del proyecto, la eliminación del trabajo infantil a través de la educación en Colombia. La fundación renacer es uno de los ejecutores de este proyecto en la ciudad de Cartagena de Indias con el propósito de incidir en la erradicación y prevención de la explotación sexual comercial de niños y adolescentes. Una de las principales acciones del proyecto está dirigida a eliminar o prevenir las peores formas de trabajo infantil propiciando servicios educativos, por medio de la estrategia espacios para crecer se construyó una alternativa complementaria a la jornada escolar formal que busca el desarrollo integral de niños y adolescentes. Este programa tiene tres componentes, el académico, el recreativo y el crecimiento personal. Esta estrategia esta concebida para trabajar en alianza con el sistema educativo formal, dando seguimiento a la escolaridad de los niños y jóvenes rescatados del trabajo infantil o en riesgo de estar involucrado en el.
title: Das postnatale Screening der neonanalen Cholestase im Neugeborenen- und Säuglingsalter
Creators: name: Madadi-Sanjani, Omid
name: Petersen, Claus
Publisher: name: German Medical Science GMS Publishing House
Year: 2016
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Die Gallengangatresie ist eine seltene Cholangiopathie deren Ätiologie trotz intensiver Grundlagenforschung bisher unbekannt verbleibt. Die erweiterten therapeutischen Möglichkeiten mittels der Kasai-Portoenterostomie und der Entwicklung der Lebertransplantation als chirurgische[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 65. Jahrestagung der Norddeutschen Gesellschaft für Kinder- und Jugendmedizin (NDGKJ)
The Vertical Current Approximation Nonlinear Force-Free Field Code - Description, Performance Tests, and Measurements of Magnetic Energies Dissipated in Solar Flares
Creators: name: Aschwanden, Markus J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this work we provide an updated description of the Vertical Current Approximation Nonlinear Force-Free Field (VCA-NLFFF) code, which is designed to measure the evolution of the potential, nonpotential, free energies, and the dissipated magnetic energies during solar flares. This code provides a complementary and alternative method to existing traditional NLFFF codes. The chief advantages of the VCA-NLFFF code over traditional NLFFF codes are the circumvention of the unrealistic assumption of a force-free photosphere in the magnetic field extrapolation method, the capability to minimize the misalignment angles between observed coronal loops (or chromospheric fibril structures) and theoretical model field lines, as well as computational speed. In performance tests of the VCA-NLFFF code, by comparing with the NLFFF code of Wiegelmann (2004), we find agreement in the potential, nonpotential, and free energy within a factor of about 1.3, but the Wiegelmann code yields in the average a factor of 2 lower flare energies. The VCA-NLFFF code is found to detect decreases in flare energies in most X, M, and C-class flares. The successful detection of energy decreases during a variety of flares with the VCA-NLFFF code indicates that current-driven twisting and untwisting of the magnetic field is an adequate model to quantify the storage of magnetic energies in active regions and their dissipation during flares. - The VCA-NLFFF code is also publicly available in the Solar SoftWare (SSW).
description: 23 Figures, 50 pages
Intrinsic strength and failure behaviors of ultra-small single-walled carbon nanotubes
Creators: name: Hung, Nguyen Tuan
name: Van Truong, Do
name: Van Thanh, Vuong
name: Saito, Riichiro
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The intrinsic mechanical strength of single-walled carbon nanotubes (SWNTs) within the diameter range of 0.3-0.8 nm has been studied based on ab initio density functional theory calculations. In contrast to predicting "smaller is stronger and more elastic" in nanomaterials, the strength of the SWNTs is significantly reduced when decreasing the tube diameter. The results obtained show that the Young`s modulus E significantly reduced in the ultra-small SWNTs with the diameter less than 0.4 nm originates from their very large curvature effect, while it is a constant of about 1.0 TPa, and independent of the diameter and chiral index for the large tube. We find that the Poisson`s ratio, ideal strength and ideal strain are dependent on the diameter and chiral index. Furthermore, the relations between E and ideal strength indicate that Griffith`s estimate of brittle fracture could break down in the smallest (2, 2) nanotube, with the breaking strength of 15% of E. Our results provide important insights into intrinsic mechanical behavior of ultra-small SWNTs under their curvature effect.
The limiting absorption principle for the discrete Wigner-von Neumann operator
Creators: name: Mandich, Marc-Adrien
Publisher: name: arXiv
Year: 2016
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We apply weighted Mourre commutator theory to prove the limiting absorption principle for the discrete Schr{ö}dinger operator perturbed by the sum of a Wigner-von Neumann and long-range type potential. In particular, this implies a new result concerning the absolutely continuous spectrum for these operators even for the one-dimensional operator. We show that methods of classical Mourre theory based on differential inequalities and on the generator of dilation cannot apply to the mentionned Schr{ö}dinger operators.
Konfrontation als Mittel der Kommunikation in Theologie, Kirche und Gesellschaft
Creators: name: Míguez Bonino, José
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 18 Nr. 10 (1982): Concilium: Internationale Zeitschrift für Theologie, Band 18, Heft 10
The relationship between household chaos, pre-bedtime behaviors and daytime sleepiness in young children
Creators: name: Poliakova, Polina
Publisher: name: No Publisher Supplied
Year: 2023

description: This study aimed to explore the relationships between household chaos, pre-school child sleep practices and child daytime sleepiness, specifically, whether household chaos moderated the relationship between child pre-bedtime behaviors and daytime sleepiness. Prior research suggests that children experiencing greater household chaos and sleep problems are at risk for increased externalizing problems and academic struggles. Exploring how chaos interacts with pre-bedtime behaviors may offer new intervention targets for addressing bedtime resistance and poor sleep quality. Data on child sleep were previously collected from caregivers of 141 1–5-year-old children (average age 4.01, SD=1.05). Caregivers completed measures of demographic information, Chaos Hubbub and Order Scale (CHAOS), Brief infant/Child Sleep Questionnaire, Pediatric Sleep Questionnaire and Teacher Daytime Sleepiness questions. The child sample was primarily African American (40.4%) and Hispanic/Latino (40.40%); 17% biracial; 0.7% White; 50.4% of the sample was female. Most caregivers did not report that their child’s sleep was problematic (76%), although most indicated some form of difficulty getting their children to sleep (71%) and 23% of children in the sample do not get the recommended length of sleep per night. On average, families engaged in greater positive pre-bedtime sleep behaviors (M=5.11, SD=2.29) and less negative pre-bedtime behaviors (M=3.25, SD=1.74); CHAOS levels were moderate (M=2.13, SD=.68). There were significant relationships between child age and pre-bedtime interfering behaviors, as well as household chaos and caregiver-reported child daytime sleepiness. Moderation results indicated that household chaos did not moderate the relationship between pre-bedtime sleep promoting behaviors and caregiver reported child daytime sleepiness (b= -0.020, t = -.957, p = .341). The full model predicted almost 10% of the variance in daytime sleepiness scores [F(6,122)=2.202, p=.047, R^2 = .098]. This study offers new measures for evaluating pre-bedtime sleep behaviors, as well as opportunities to advance sleep-conducing behaviors within the family unit as a whole.
Mass gap in the critical gravitational collapse of a kink
Creators: name: Barreto, W.
name: Crespo, J.
name: de Oliveira, H.
name: Rodrigues, E.
name: Rodriguez-Mueller, B.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the gravitational collapse of a kink within spherical symmetry and the characteristic formulation of General Relativity. We explore some expected but elusive gravitational collapse issues which have not been studied before in detail, finding new features. The numerical one-parametric solution and the structure of the spacetime are calculated using finite differences, Galerkin collocation techniques, and some scripting for automated grid coverage. We study the threshold of black hole formation and confirm a mass gap in the phase transition. In the supercritical case we find a mass scaling power law $M_{BH}={M^*_{BH}}+K[λ-λ^*]^{2γ}+f(K[λ-λ^*]^{2γ})$, with $γ\approx 0.37$ independent of the initial data for the cases considered, and $M^*_{BH}$, $K$ and $λ^*$ each depending on the initial datum. The spacetime has a self-similar structure with a period of $Δ\approx 3.4$. In the subcritical case the Bondi mass at null infinity decays in cascade with $Δ/2$ interval as expected.
description: 5 pages, 5 figures; to appear in Physical Review D
Sistemas de información como herramienta para la gerencia de las grandes empresas del sector comercial de la ciudad de Cartagena
Creators: name: Chaverra Salas, Edinson
name: Ramirez Acosta, Antonio Carlos
Publisher: name: Universidad de Cartagena
Year: 2003
Subjects: Información - Sistema de almacenamiento y recuperación
Sistemas de información

description: Tesis (Administrador de Empresas). -- Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 2003
description: El presente estudio tiene por objeto analizar y determinar el impacto de los sistemas de información sobre la gestión gerencial de las grandes empresas del sector comercial de la ciudad de Cartagena, con el fin de mejorar su competitividad en el entorno económico actual.
Discovery of periodic and alternating flares of the methanol and water masers in G107.298+5.639
Creators: name: Szymczak, M.
name: Olech, M.
name: Wolak, P.
name: Bartkiewicz, A.
name: Gawronski, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Methanol and water vapour masers are signposts of early stages of high-mass star formation but it is generally thought that due to different excitation processes they probe distinct parts of stellar environments. Here we present observations of the intermediate-mass young stellar object G107.298+5.639, revealing for the first time that 34.4 d flares of the 6.7 GHz methanol maser emission alternate with flares of individual features of the 22 GHz water maser. High angular resolution data reveal that a few components of both maser species showing periodic behaviour coincide in position and velocity and all the periodic water maser components appear in the methanol maser region of size of 360 au. The maser flares could be caused by variations in the infrared radiation field induced by cyclic accretion instabilities in a circumstellar or protobinary disc. The observations do not support either the stellar pulsations or the seed photon flux variations as the underlying mechanisms of the periodicity in the source.
description: 6 pages, 4 figures, 1 table, accepted for publication in MNRAS Letters
NutzerInnenorientierte Gestaltung und Bewertung von Virtual Reality Anwendungen für SeniorInnen
Creators: name: Napetschnig, A.
Publisher: name: Zenodo
Year: 2023

description: Poster im Rahmen der Veranstaltung "Tag der NachwuchswissenschaftlerInnen 2023" der Hochschule für Gesundheit Bochum