Communities that educate: first steps in the construction of a utopia

[EN] Educational research has shown that the experiences that seek the democratization of the school organization and the generation of collaborative links inside and outside the school, favor the achievement of educational purposes. From this perspective, a group of education professionals set out to develop an educational experience that would articulate the efforts of the university, organized civil society, the public school and the community that hosts it, in order to build a project aimed at improving processes in a primary school; likewise, reflect on the concept of an communities that educate, which is inspired and nurtured by the theoretical and experiential work developed around the concepts of learning communities and educating cities. This communication shows the first steps in the formation of this community and the development of a participatory diagnosis, using the techniques of a research workshop and discussion groups, in addition to the problem analysis tool, within the framework of a participatory action research project with a qualitative approach. The exercise made it possible to identify a matrix of problems and establish priority actions to draw a work route. In this regard, the group agreed to study and influence the school-community linkage processes as a starting point. This collaborative effort made it possible to identify the potential of participatory experiences, in addition to the recovery of learning for the continuity of the experience.[ES] La investigación educativa ha demostrado que las experiencias que buscan la democratización de la organización escolar y la generación de vínculos de colaboración al interior y al exterior de la escuela, favorecen el logro de los propósitos formativos. Desde esta perspectiva, un colectivo de profesionales de la educación se propuso desarrollar una experiencia educativa que articulara los esfuerzos de la universidad, la sociedad civil organizada, la escuela pública y la comunidad que la alberga, con objeto de construir un proyecto orientado a la mejora de los procesos en una escuela primaria; asimismo, reflexionar sobre el concepto de comunidad educadora, que se inspira y nutre del trabajo teórico y experiencial desarrollado en torno a los conceptos de comunidades de aprendizaje y ciudades educadoras. La presente comunicación muestra los primeros pasos en la conformación de esta comunidad y el desarrollo de un diagnóstico participativo, que involucró a 93 docentes y personal directivo de educación primaria, para el cual se utilizaron las técnicas de taller investigativo y grupos de discusión, además de la herramienta de análisis de problemas, en el marco de un proyecto de investigación-acción participativa de enfoque cualitativo. El ejercicio permitió identificar una matriz de problemas y establecer acciones prioritarias para trazar una ruta de trabajo. Al respecto, el colectivo coincidió en estudiar e incidir en los procesos de vinculación escuela-comunidad como punto de partida. Este esfuerzo colaborativo hizo posible identificar el potencial de las experiencias participativas, además de la recuperación de aprendizajes para la continuidad de la experiencia.Elías Hernández, J.; Cervantes Arreola, D.; Anguiano Escobar, B.; Altamirano Pérez, L. (2021). Comunidades educadoras: primeros pasos en la construcción de una utopía. REDU. Revista de Docencia Universitaria. 19(1):27-43. https://doi.org/10.4995/redu.2021.14730OJS2743191Aboites, H. (2012). La disputa por la evaluación en México: historia y futuro. El Cotidiano(176), 5-17. Obtenido de https://www.redalyc.org/pdf/325/32525230002.pdfAguilera, A., Mendoza, M., Racionero, S., Soler, M. (2010). El papel de la universidad en comunidades de aprendizaje. 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La educación como práctica de la libertad (45a ed.). (L. Ronzoni, Trad.) D.F., México: Siglo XXI.Galeano, E. (2001). Las palabras andantes (5a ed.). Buenos Aires, Argentina: Catálogos.García-Gómez, L., & Aldana-González, G. (2010). Cultura escolar: un elemento indispensable para comprender los procesos de inclusión educativa. Acción Pedagógica(19), 116-125. Obtenido de http://www.saber.ula.ve/handle/123456789/31933Gordo, Á., & Serrano (coords), A. (2008). Estrategias y prácticas cualitativas de investigación social. Madrid, España: Pearson.Grosfoguel, R. (2006). La descolonización de la economía política y los estudios postcoloniales: Transmodernidad, pensamiento fronterizo y colonialidad global. Tabula Rasa, 17-46. https://doi.org/10.25058/20112742.245Heron, J., & Reason, P. (2008). Extending Epistemology within a Co-operative Inquiry. En P. Reason, & H. Bradbury, The SAGE Handbook of Action Research. Participative Inquiry and Practice (págs. 366-380). London: Sage Publications. https://doi.org/10.4135/9781848607934.n32Jiménez, Y., Hernández, J., & Ortega, J. (2014). ¿Forman los programas de formación docente? CPU-e, Revista de Investigación Educativa, (19), 1-27. Obtenido de https://doi.org/10.25009/cpue.v0i19.964Lewin, K. (1946). Action research and minority problems. Journal of Social Issues, 4(2), 34-46. https://doi.org/10.1111/j.1540-4560.1946.tb02295.xMartínez, R. (2011). La epistemología rupturista. Reflexiones sobre un psicoanálisis del objeto. México: Plaza y Valdés. Obtenido de http://www.celapec.edu.mx/ documentos/martinez_-_la-epistemologia-rupturista.pdfMignolo, W. (2010). Desobediencia epistémica: retórica de la modernidad, lógica de la colonialidad y gramática de la descolonialidad. Buenos Aires: Ediciones del signo.Morales, G., & Mezquita, R. (2018). La importancia del contexto educativo: la ciudad educadora. 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Stability of dark solitons in a Bose-Einstein condensate trapped in an optical lattice

We investigate the stability of dark solitons (DSs) in an effectively one-dimensional Bose-Einstein condensate in the presence of the magnetic parabolic trap and an optical lattice (OL). The analysis is based on both the full Gross-Pitaevskii equation and its tight-binding approximation counterpart (discrete nonlinear Schr{\"o}dinger equation). We find that DSs are subject to weak instabilities with an onset of instability mainly governed by the period and amplitude of the OL. The instability, if present, sets in at large times and it is characterized by quasi-periodic oscillations of the DS about the minimum of the parabolic trap.Comment: Typo fixed in Eq. (1): cos^2 -> sin^

Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}}=2.76 TeV

The elliptic, $v_2$, triangular, $v_3$, and quadrangular, $v_4$, azimuthal anisotropic flow coefficients are measured for unidentified charged particles, pions and (anti-)protons in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle cumulant methods are reported for the pseudo-rapidity range $|\eta|<0.8$ at different collision centralities and as a function of transverse momentum, $p_{\rm T}$, out to $p_{\rm T}=20$ GeV/$c$. The observed non-zero elliptic and triangular flow depends only weakly on transverse momentum for $p_{\rm T}>8$ GeV/$c$. The small $p_{\rm T}$ dependence of the difference between elliptic flow results obtained from the event plane and four-particle cumulant methods suggests a common origin of flow fluctuations up to $p_{\rm T}=8$ GeV/$c$. The magnitude of the (anti-)proton elliptic and triangular flow is larger than that of pions out to at least $p_{\rm T}=8$ GeV/$c$ indicating that the particle type dependence persists out to high $p_{\rm T}$.Comment: 16 pages, 5 captioned figures, authors from page 11, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/186

Centrality dependence of charged particle production at large transverse momentum in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm{NN}}} = 2.76 TeV

The inclusive transverse momentum ($p_{\rm T}$) distributions of primary charged particles are measured in the pseudo-rapidity range $|\eta|<0.8$ as a function of event centrality in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}=2.76$ TeV with ALICE at the LHC. The data are presented in the $p_{\rm T}$ range $0.15<p_{\rm T}<50$ GeV/$c$ for nine centrality intervals from 70-80% to 0-5%. The Pb-Pb spectra are presented in terms of the nuclear modification factor $R_{\rm{AA}}$ using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-$p_{\rm T}$ particles strongly depends on event centrality. In central collisions (0-5%) the yield is most suppressed with $R_{\rm{AA}}\approx0.13$ at $p_{\rm T}=6$-7 GeV/$c$. Above $p_{\rm T}=7$ GeV/$c$, there is a significant rise in the nuclear modification factor, which reaches $R_{\rm{AA}} \approx0.4$ for $p_{\rm T}>30$ GeV/$c$. In peripheral collisions (70-80%), the suppression is weaker with $R_{\rm{AA}} \approx 0.7$ almost independently of $p_{\rm T}$. The measured nuclear modification factors are compared to other measurements and model calculations.Comment: 17 pages, 4 captioned figures, 2 tables, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/284

Measurement of charm production at central rapidity in proton-proton collisions at s=2.76\sqrt{s} = 2.76 TeV

The $p_{\rm T}$-differential production cross sections of the prompt (B feed-down subtracted) charmed mesons D$^0$, D$^+$, and D$^{*+}$ in the rapidity range $|y|<0.5$, and for transverse momentum $1< p_{\rm T} <12$ GeV/$c$, were measured in proton-proton collisions at $\sqrt{s} = 2.76$ TeV with the ALICE detector at the Large Hadron Collider. The analysis exploited the hadronic decays D$^0 \rightarrow$K$\pi$, D$^+ \rightarrow$K$\pi\pi$, D$^{*+} \rightarrow$D$^0\pi$, and their charge conjugates, and was performed on a $L_{\rm int} = 1.1$ nb$^{-1}$ event sample collected in 2011 with a minimum-bias trigger. The total charm production cross section at $\sqrt{s} = 2.76$ TeV and at 7 TeV was evaluated by extrapolating to the full phase space the $p_{\rm T}$-differential production cross sections at $\sqrt{s} = 2.76$ TeV and our previous measurements at $\sqrt{s} = 7$ TeV. The results were compared to existing measurements and to perturbative-QCD calculations. The fraction of cdbar D mesons produced in a vector state was also determined.Comment: 20 pages, 5 captioned figures, 4 tables, authors from page 15, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/307

Measurements of fiducial cross-sections for t\bart production with one or two additional b-jets in pp collisions at √s =8 TeVusing the ATLAS detector

Fiducial cross-sections for $t\bar{t}$ production with one or two additional $b$-jets are reported, using an integrated luminosity of 20.3 fb$^{-1}$ of proton--proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for $t\bar{t}$ events with at least one additional $b$-jet is measured to be 950 $\pm$ 70 (stat.) $^{+240}_{-190}$ (syst.) fb in the lepton-plus-jets channel and 50 $\pm$ 10 (stat.) $^{+15}_{-10}$ (syst.) fb in the $e \mu$ channel. The cross-section times branching ratio for events with at least two additional $b$-jets is measured to be 19.3 $\pm$ 3.5 (stat.) $\pm$ 5.7 (syst.) fb in the dilepton channel ($e \mu$,\,$\mu\mu$, and \,$ee$) using a method based on tight selection criteria, and 13.5 $\pm$ 3.3 (stat.) $\pm$ 3.6 (syst.) fb using a looser selection that allows the background normalisation to be extracted from data. The latter method also measures a value of 1.30 $\pm$ 0.33 (stat.) $\pm$ 0.28 (syst.)\% for the ratio of $t\bar{t}$ production with two additional $b$-jets to $t\bar{t}$ production with any two additional jets. All measurements are in good agreement with recent theory predictions.Comment: 41 pages plus author list + cover page (58 total), 9 Figures, 16 tables, submitted to EPJC, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-10

Measurement of the branching ratio Γ(Λb⁰ → ψ(2S)Λ0)/Γ(Λb⁰ → J/ψΛ0) with the ATLAS detector

An observation of the $\Lambda_b^0 \rightarrow \psi(2S) \Lambda^0$ decay and a comparison of its branching fraction with that of the $\Lambda_b^0 \rightarrow J/\psi \Lambda^0$ decay has been made with the ATLAS detector in proton--proton collisions at $\sqrt{s}=8\,$TeV at the LHC using an integrated luminosity of $20.6\,$fb$^{-1}$. The $J/\psi$ and $\psi(2S)$ mesons are reconstructed in their decays to a muon pair, while the $\Lambda^0\rightarrow p\pi^-$ decay is exploited for the $\Lambda^0$ baryon reconstruction. The $\Lambda_b^0$ baryons are reconstructed with transverse momentum $p_{\rm T}>10\,$GeV and pseudorapidity $|\eta|<2.1$. The measured branching ratio of the $\Lambda_b^0 \rightarrow \psi(2S) \Lambda^0$ and $\Lambda_b^0 \rightarrow J/\psi \Lambda^0$ decays is $\Gamma(\Lambda_b^0 \rightarrow \psi(2S)\Lambda^0)/\Gamma(\Lambda_b^0 \rightarrow J/\psi\Lambda^0) = 0.501\pm 0.033 ({\rm stat})\pm 0.019({\rm syst})$, lower than the expectation from the covariant quark model.Comment: 12 pages plus author list (28 pages total), 5 figures, 1 table, published on Physics Letters B 751 (2015) 63-80. All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-08

Dijet production in √s = 7 TeV pp collisions with large rapidity gaps at the ATLAS experiment

A 6.8 nb−¹ sample of pp collision data collected under low-luminosity conditions at √s = 7 TeV by the ATLAS detector at the Large Hadron Collider is used to study diffractive dijet production. Events containing at least two jets with pT > 20 GeV are selected and analysed in terms of variables which discriminate between diffractive and non-diffractive processes. Cross sections are measured differentially in ΔηF, the size of the observable forward region of pseudorapidity which is devoid of hadronic activity, and in an estimator, ξ˜, of the fractional momentum loss of the proton assuming single diffractive dissociation (pp → p X). Model comparisons indicate a dominant non-diffractive contribution up to moderately large ηF and small ξ˜, with a diffractive contribution which is significant at the highest ΔηF and the lowest ξ˜. The rapidity-gap survival probability is estimated from comparisons of the data in this latter region with predictions based on diffractive parton distribution functions