cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multilingual transformer and BERTopic for short text topic modeling: The case of Serbian
Creators: name: Medvecki, Darija
name: Bašaragin, Bojana
name: Ljajić, Adela
name: Milošević, Nikola
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: This paper presents the results of the first application of BERTopic, a state-of-the-art topic modeling technique, to short text written in a morphologi-cally rich language. We applied BERTopic with three multilingual embed-ding models on two levels of text preprocessing (partial and full) to evalu-ate its performance on partially preprocessed short text in Serbian. We also compared it to LDA and NMF on fully preprocessed text. The experiments were conducted on a dataset of tweets expressing hesitancy toward COVID-19 vaccination. Our results show that with adequate parameter setting, BERTopic can yield informative topics even when applied to partially pre-processed short text. When the same parameters are applied in both prepro-cessing scenarios, the performance drop on partially preprocessed text is minimal. Compared to LDA and NMF, judging by the keywords, BERTopic offers more informative topics and gives novel insights when the number of topics is not limited. The findings of this paper can be significant for re-searchers working with other morphologically rich low-resource languages and short text.
Bolivia en la encrucijada de la COVID 19
Creators: name: Hernández Bermúdez, Orietta E.
Publisher: name: Comparative Cultural Studies - European and Latin American Perspectives
Year: 2020

description: En noviembre de 2019, un golpe de estado cívico-militar-policial, interrumpió el Proceso de Cambio liderado por Evo Morales Ayma en el Estado Plurinacional de Bolivia. La autoproclamación de Jeanine Añez como presidenta del país dio inicio a un período oscuro de la historia boliviana caracterizado por inestabilidad y persecución política. El nuevo gabinete ha ido desmontando los logros sociales obtenidos por la administración anterior, sumiendo al país en un escenario de incertidumbre. En este contexto Bolivia enfrenta el reto de la llegada de la COVID 19. En este artículo analizaremos el deficiente manejo de la pandemia por parte del gobierno golpista así como el verdadero trasfondo electoralista de las medidas tomadas por la Presidenta/candidata Jeanine Añez.
description: Comparative Cultural Studies - European and Latin American Perspectives, Vol. 5 No. 10 (2020)
On renormalization group flows and the a-theorem in 6d
Creators: name: Elvang, Henriette
name: Freedman, Daniel Z.
name: Hung, Ling-Yan
name: Kiermaier, Michael
name: Myers, Robert C.
name: Theisen, Stefan
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the extension of the approach to the a-theorem of Komargodski and Schwimmer to quantum field theories in d=6 spacetime dimensions. The dilaton effective action is obtained up to 6th order in derivatives. The anomaly flow a_UV - a_IR is the coefficient of the 6-derivative Euler anomaly term in this action. It then appears at order p^6 in the low energy limit of n-point scattering amplitudes of the dilaton for n > 3. The detailed structure with the correct anomaly coefficient is confirmed by direct calculation in two examples: (i) the case of explicitly broken conformal symmetry is illustrated by the free massive scalar field, and (ii) the case of spontaneously broken conformal symmetry is demonstrated by the (2,0) theory on the Coulomb branch. In the latter example, the dilaton is a dynamical field so 4-derivative terms in the action also affect n-point amplitudes at order p^6. The calculation in the (2,0) theory is done by analyzing an M5-brane probe in AdS_7 x S^4. Given the confirmation in two distinct models, we attempt to use dispersion relations to prove that the anomaly flow is positive in general. Unfortunately the 4-point matrix element of the Euler anomaly is proportional to stu and vanishes for forward scattering. Thus the optical theorem cannot be applied to show positivity. Instead the anomaly flow is given by a dispersion sum rule in which the integrand does not have definite sign. It may be possible to base a proof of the a-theorem on the analyticity and unitarity properties of the 6-point function, but our preliminary study reveals some difficulties.
description: 41 pages, 5 figures
Electronic and optical spectra in a diluted magnetic semiconductor multilayer
Creators: name: Gharaee, Leili
name: Saffarzadeh, Alireza
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The effects of random distribution of magnetic impurities with concentration $x$ in a semiconductor alloy multilayer at a paramagnetic temperature are investigated by means of coherent potential approximation and tight-binding model. The change in the electronic states and the optical absorption spectrum with $x$ is calculated for weak and strong exchange interactions between carrier spins and localized spin moments on magnetic ions. We find that the density of states and optical absorption are strongly layer-dependent due to the quantum size effects. The electronic and optical spectra are broadened due to the spin fluctuations of magnetic ions and in the case of strong exchange interaction, an energy gap appears in both spectra. Furthermore, the interior layers show higher contribution in the optical absorption of the system. The results can be helpful for magneto-optical devices at a paramagnetic temperature.
description: 7 pages, 5 figures
Comparison of limb-darkening laws from plane-parallel and spherically-symmetric model stellar atmospheres
Creators: name: Neilson, Hilding
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Limb-darkening is a fundamental constraint for modeling eclipsing binary and planetary transit light curves. As observations, for example from Kepler, CoRot, and Most, become more precise then a greater understanding of limb-darkening is necessary. However, limb-darkening is typically modeled as simple parameterizations fit to plane-parallel model stellar atmospheres that ignores stellar atmospheric extension. In this work, I compute linear, quadratic and four-parameter limb-darkening laws from grids of plane-parallel and spherically-symmetric model stellar atmospheres in a temperature and gravity range representing stars evolving on the Red Giant branch. The limb-darkening relations for each geometry are compared and are found to fit plane-parallel models much better than the spherically-symmetric models. Assuming that limb-darkening from spherically-symmetry model atmospheres are more physically representative of actual stellar limb-darkening than plane-parallel models then these limb-darkening laws will not fit the limb of a stellar disk leading to errors in a light curve fit. This error will increase with a star's atmospheric extension.
description: 5 pages, 2 figures, To appear in the proceedings of the IAUS 282 on "From Interacting Binaries to Exoplanets: Essential Modelling Tools" (Tatranska Lomnica, Slovakia, July 2011), Cambridge University Press
Macondo en época de Covid-19. ¿Hasta cuándo la resiliencia colombiana?
Creators: name: Riccardi, Davide
name: Romero Tenorio, José Manuel
name: Bossio Blanco, Verónica Del Carmen
Publisher: name: Comparative Cultural Studies - European and Latin American Perspectives
Year: 2020

description: This article analyzes the Colombian pandemic context during Covid-19 health emergency. Initially, we describe the different lockdown policies adopted by the main governments of Latin America and the Caribbean. Successively, we evidence the contradictions between the constitutional fundamental principles and the current health system. This situation reveals the inequitable national tax regime and the timid economic initiatives that the Government is taking to contain the emergency. Finally, we highlight the evident threats to the peace process given especially by the increase in the assassinations of social leaders and ex-combatants. This situation is accompanied by the growing of legal and illegal pressure that neo-extra-activist interest groups are perpetrating against indigenous and Afro-descendant communities.
description: Comparative Cultural Studies - European and Latin American Perspectives, Vol. 5 No. 10 (2020)
title: Bulkhead Replacement and Pier Repairs (NWS-2023-00437 Jackson Square Properties)
titleType: AlternativeTitle
title: Endangered Species Act Section 7(a)(2) Biological Opinion and Magnuson-Stevens Fishery Conservation and Management Act Essential Fish Habitat Response for the Jackson Square Properties Pier Repairs and Partial Bulkhead Replacement, King County, Washington (USACE No. NWS-2023-00437, HUC: 171100120400 – Lake Washington).
Creators: name: United States. National Marine Fisheries Service. West Coast Region
Publisher: name: United States. National Marine Fisheries Service. West Coast Region
Year: 2025

description: WCRO-2023-02784
Geopolítica de la Infodemia y Escenarios Covid-19
Creators: name: Sunamis Fabelo, Concepción
Publisher: name: Comparative Cultural Studies - European and Latin American Perspectives
Year: 2020

description: La aparición del nuevo coronavirus y la posterior pandemia en que devino la Covid-19, llegó acompañada de la infodemia: Se trata de la sobrexposición informativa a que hemos estado expuestos en un ambiente de preocupación, estrés, ansiedad y angustia. Este fenómeno no ha generado más que desinformación, tras la cual puede advertirse determinada intencionalidad. En el siguiente trabajo se expone el desarrollo de los escenarios en materia comunicacional en torno a la pandemia Covid-19, desde la perspectiva de las Relaciones Internacionales. En tal sentido se presenta un acercamiento a lo que pudiéramos llamar la Geopolítica de la Infodemia, muy relacionada con la Geopolítica de la Tecnología. A la hora de gestionar la crisis básicamente se han identificado dos modelos: el asiático y el occidental. Al rededor de ello giran toda una serie de cuestiones que escapan a la coyuntura de la pandemia y que sin lugar a dudas marcarán tendencias en el complejo entramado Comunicación-política-Relaciones Internacionales.
description: Comparative Cultural Studies - European and Latin American Perspectives, Vol. 5 No. 10 (2020)
The crisis of liberal democracies and the need for a new “social contract” in the post-Covid 19 era
Creators: name: Geri, Maurizio
Publisher: name: Comparative Cultural Studies - European and Latin American Perspectives
Year: 2020

description: This article analyses the crisis of liberal democracies, coming before the Covid 19 era but worsened with this virus emergency. The main argument of the article is that this public health threat amplified problems that Western liberal democracies already had, at different levels and with different actors, and that our democracies need a new social contract in order to rebirth. The article starts analysing the concept of “State of exception”, from Italian philosopher Agamben, then speaks briefly about the democratic erosion during this time in order to explain the reason for a new social contract for a Western liberal democratic rebirth. The second part analyses ten issues, ten P-roblems (all starting with P letter) affecting modern Western liberal democracies, in particular: Poverty, Partitocracy, Populism, Polarization, Post-fact/post-truth informational society, Post-secular/Post-ideological world, Power erosion (of democratic nation states), Political illegitimacy (of the West), and Planetary identity crisis. With Pandemics another P-roblem will be added. The virus crisis could be used as a tipping point for the adaptation of Western liberal democracies to post-modernity and globalized world, not only for their survival but for the survival of the species.
description: Comparative Cultural Studies - European and Latin American Perspectives, Vol. 5 No. 10 (2020)
Benchmarking a Teleportation Protocol realized in Superconducting Circuits
Creators: name: Baur, M.
name: Fedorov, A.
name: Steffen, L.
name: Filipp, S.
name: da Silva, M. P.
name: Wallraff, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Teleportation of a quantum state may be used for distributing entanglement between distant qubits in quantum communication and for quantum computation. Here we demonstrate the implementation of a teleportation protocol, up to the single-shot measurement step, with superconducting qubits coupled to a microwave resonator. Using full quantum state tomography and evaluating an entanglement witness, we show that the protocol generates a genuine tripartite entangled state of all three-qubits. Calculating the projection of the measured density matrix onto the basis states of two qubits allows us to reconstruct the teleported state. Repeating this procedure for a complete set of input states we find an average output state fidelity of 88%.
description: 4 pages, 4 figures
Europe, epicenter of the COVID-19 pandemic. Democracy and the Therapeutic state
Creators: name: Campani, Giovanna
Publisher: name: Comparative Cultural Studies - European and Latin American Perspectives
Year: 2020

description: The paper discusses the measures that have been taken by the European governments in front of the COVID-19 epidemics, raising the issues of the fundamental liberties and the state of law in front of a dominating right to health. Exploring the differences among the lockdown measures – more draconian – Chinese style – as Italy or Spain – or softer as Germany and Northern European countries, the article considers as well the positions of philosophers as Giorgio Agamben or Bernard-Henri Lévy, and jurists, constitutionalists, lawyers. The already ancient debate about medical power in society is also evoked (Thomas Szasz). Finally, the Swedish model is evoked, together with the reactions against lockdowns by the populations, indicating that the draconian lockdown – given the damages inflicted to economy and social life – won’t be a model to follow in the future, while more balanced forms of control of the epidemic (more testing, isolation of the clusters, better reception services in the hospital) will represent the democratic answer to the challenge.
description: Comparative Cultural Studies - European and Latin American Perspectives, Vol. 5 No. 10 (2020)
Kenterversuche in der Eckernförder Bucht im Jahre 1968
Creators: name: Kastner, Sigismund
Publisher: name: TUHH Universitätsbibliothek
Year: 1973
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Kenterversuche in der Eckernförder Bucht im Jahre 1968
Optimization of brain and life performance: Striving for playing at the top for the long run
Creators: name: Sornette, Didier
Publisher: name: arXiv
Year: 2011
Subjects: subject: Other Quantitative Biology (q-bio.OT)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: In this essay written with my students and collaborators in mind, I share simple recipes that are easy and often fun to put in practice and that make a big difference in one's life. The seven guiding principles are: (1) sleep, (2) love and sex, (3) deep breathing and daily exercises, (4) water and chewing, (5) fruits, unrefined products, food combination, vitamin D and no meat, (6) power foods, (7) play, intrinsic motivation, positive psychology and will. These simple laws are based on an integration of evolutionary thinking, personal experimentation, and evidence from experiments reported in the scientific literature. I develop their rationality, expected consequences and describe briefly how to put them in practice. I hope that professionals and the broader public may also find some use for it, as I have seen already the positive impacts on some of my students.
description: 13 pages
National Survey of Solidarity and Voluntary Action - ENSAV 2012
Creators: name: Centro De Investigación Y Estudios Sobre Sociedad Civil (CIESC)
name: Centro Mexicano De Filantropía
Publisher: name: Roper Center for Public Opinion Research
Year: 2023

description: Service actions without payment in the last year (26); frequency of service/volunteer work over the last year (25); duration of service/volunteer work (50); performed service/volunteered in the last month (25); method of service (1); service/volunteer work activities ever performed (38); impetus for becoming involved in service (1); friends made through service/volunteer work (1); reasons for performing service (2); people in respondent’s immediately family in service to others (6); have invited others to be in service to others (1); propensity to act in service (4); group identity (3); donation in money and kind in the last year (8); has received support in time or kind from non-relatives or non-governmental organization (30); personal financial situation compared to last year (1); anticipated future financial situation (1); current health/quality of life (2); trust in people (5); impact of local crime/violence (2).
Shock wave collisions in AdS5: approximate numerical solutions
Creators: name: Wu, Bin
name: Romatschke, Paul
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We numerically study the evolution of a boost-invariant N=4 SYM medium using AdS/CFT. We consider a toy model for the collision of gravitational shock waves, finding that the energy density first increases, reaches a maximum and then starts to decrease, matching hydrodynamics for late times. For the initial conditions we consider, the hydrodynamic scale governing the late time behaviour is to very good approximation determined by the area of the black hole horizon at initial times. Our results provide a toy model for the early time evolution of the bulk system in heavy-ion collisions at RHIC and the LHC.
description: 29 pages, 9 figures
The Northwest Territories reconstruction project : telling our stories
Creators: name: Covello, Elizabeth Jonquil
Publisher: name: University of British Columbia
Year: 2010

description: Early travellers and adventurers in the Northwest Territories in their struggle to deal with the harshness of the land and the strangeness of the inhabitants were often unable to give a verbal shape to the landscape and the people beyond that of the familiar images of their European background. North became synonymous with alien, hostile, cold, barren, and mysterious and its people were identified alternatively as abject, heathen, filthy and sometimes dangerous savages or as paragons of noble manhood who served as examples for future imperializing ventures. I examine two travel narratives of the Northwest Territories and argue that a discourse of North, that was constructed from an imperialist, Eurocentric perspective failed to take into account the stories, the history and the culture of the indigenous people who lived there. I question the means by which such received history and knowledge becomes validated and empowering, while at the same time, other uncredentialed knowledge and stories which lack authority are lost. Warburton Pike wrote The Barren Ground of Northern Canada in 1892 and Agnes Deans Cameron wrote The New North in 1910. These works and others, while contributing to early knowledge of the indigenous people, were instrumental in framing an imaginary north that assumed hegemonic status over the geographical and cultural north that already existed. I then examine the works of two recent indigenous writers, George Blondin and Robert Alexie, who write back to Eurocentric constructions of north to validate their own histories and reclaim their land, not just in the physical sense of land claims but in ways which will give credence to their stories and their culture. I consider the role of stories and their power to preserve or destroy and I conclude with the hope that I can undertake a future work to examine in more detail the wealth of narrative available about the Northwest Territories.
Observations on a highly anisotropic wave impedance for the telluric field near the Rocky Mountains of Alberta
Creators: name: Brewster, Charles W.
Publisher: name: University of Calgary
Year: 1967
Subjects: subject: QC 801 B74 1967
subject: Geophysics
subject: FOS: Earth and related environmental sciences
subject: Earth currents

description: Bibliography: p. 169-172.
Documenting Panel Data
Creators: name: Hebing, Marcel
name: Wenzig, Knut
Publisher: name: Zenodo
Year: 2016
Subjects: EDDI15
DDI
panel data
metadata

description: The key characteristics of panel studies include repeated measures for a more or less stable sample over time. The core challenge in documenting panel studies is the documentation of these repeated measures (usually questions) and the resulting variables because various reasons can require modifications of measures over time - resulting in comparable but not identical data structures. The DDI standard provides not one but multiple options for the documentation of panel data. In this workshop we like to present various options and discuss their feasibility for common use cases. The German Socio-Economic Panel (SOEP) will provide the primary use case, but participants are also invited to introduce and discuss their own use cases. The workshop starts with a short introduction of both panel studies and the DDI standard. Therefore, no previous knowledge of the DDI standard is required to participate in the workshop. The goal for the workshop is to gain a deeper understanding of possible documentation strategies for panel studies.
description: {"references": ["Source: Hebing 2016, p. 46 (urn:nbn:de:bvb:473-opus4-466142)", "Source: http://www.ddialliance.org/sites/default/files/what-is-ddi-diagram.jpg", "DOI:10.3886/DDILongitudinal05"]}
Structure of the functional atrioventricular node of the rabbit heart
Creators: name: DeFelice, Louis John
Publisher: name: University of Calgary
Year: 1967
Subjects: subject: QL 838 D43 1967
subject: Heart
subject: Rabbits - Physiology
subject: Atrioventricular node

description: Bibliography: (vol. 1) p. 107-113.
Berechnung hydrodynamischer Koeffizienten von Ubooten zur Vorhersage des Bewegungsverhaltens
Creators: name: Bohlmann, Hans Jürgen
Publisher: name: TUHH Universitätsbibliothek
Year: 1990
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Berechnung hydrodynamischer Koeffizienten von Ubooten zur Vorhersage des Bewegungsverhaltens In dieser Arbeit wird ein umfassendes Berechnungsverfahren zur Ermittlung der hydrodynamischen Koeffizienten der Bewegungsgleichungen von Ubooten vorgestellt, das es ermöglicht, die Bewegung von Ubooten in allen sechs Freiheitsgraden ausreichend genau vorherzusagen. Fast alle angewendeten Gleichungen sind durch Messungen an Tragflügeln, Zylindern und Ellipsoiden bestätigt worden. Die Wechselwirkungen zwischen einzelnen Komponenten, wie zwischen Tiefenruder und Rumpf mit oder ohne Propeller sowie zwischen Turmwirbel und Rumpf bzw. oberem Seitenruder wurden ausführlich untersucht. Das in dieser Arbeit beschriebene Berechnungsverfahren wurde durch Vergleich mit Messungen an sieben verschiedenen Ubootsmodellen sowie an einem ubootsähnlichen Rumpf ohne Turm und ohne Propeller überprüft und lieferte in den meisten Fällen gute Ergebnisse, die jedoch durch genauere Erfassung insbesondere der Strömungsverhältnisse am Hinterschiff und der Wechselwirkung zwischen dem Turmnachstrom und dem Bootsrumpf noch zu verbessern wären.
The Rights of the Child forgotten in Italy’s coronavirus emergency
Creators: name: Tolomelli, Alessandro
Publisher: name: Comparative Cultural Studies - European and Latin American Perspectives
Year: 2020

description: The coronavirus emergency radically changes our habits and way of life, and clearly highlight the inadequacy of our decision-making apparatus and the latent injustices in society. The paper focuses on the failure consideration of the needs and rights of the Child in the urgent decrees implemented by the Italian Government and by the most affected Regions of the peninsula. In a general context in which the perception of the danger activates regressive mechanisms at a social level (such as the search for the scapegoat and the polarization of the behaviours of the citizens), one would expect that the ruling classes maintain rationality and foresight in management of the crisis. Moreover, a scarce “widespread pedagogical culture” which generated the complete removal of the child and educational issue from the political agenda and from public discourse up to the present day. The question of the relationship between education and democracy and the education as a community task must be reconsider as a prior topic for our society, as John Dewey taught.
description: Comparative Cultural Studies - European and Latin American Perspectives, Vol. 5 No. 10 (2020)
Design of thin micro-architectured panels with extension-bending coupling effects using topology optimization
Creators: name: Agnelli, Filippo
name: Nika, Grigor
name: Constantinescu, Andrei
Publisher: name: Weierstrass Institute
Year: 2021
Subjects: subject: Topology optimization
subject: micro-architectured panels
subject: shape morphing
subject: inverse homogenization
subject: level set method
subject: 74K20
subject: 74P10
subject: 74P15
subject: 49M41

description: We design thin micro-architectured panels with programmable macroscopic behaviour using inverse homogenization, the Hadamard shape derivative, and a level set method in the diffuse interface context. The optimally designed microstructures take into account the extension-bending effect in addition to in-plane stiffness and out-of-plane bending stiffness. Furthermore, we present numerical examples of optimal microstructures that attain different targets for different volume fractions and interpret the physical significance of the extension-bending coupling. The simultaneous control of the in-plane, out-of-plane and their coupled behaviour enables to shift a flat panel into a dome or saddle shaped structure under the action of an in-plane loading. Moreover, the obtained unit cells are elementary blocks to create three-dimensional objects with shape-morphing capabilities.
Non-Abelian Braiding of Lattice Bosons
Creators: name: Kapit, Eliot
name: Ginsparg, Paul
name: Mueller, Erich
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on a numerical experiment in which we use time-dependent potentials to braid non-abelian quasiparticles. We consider lattice bosons in a uniform magnetic field within the fractional quantum Hall regime, where $ν$, the ratio of particles to flux quanta, is near 1/2, 1 or 3/2. We introduce time-dependent potentials which move quasiparticle excitations around one another, explicitly simulating a braiding operation which could implement part of a gate in a quantum computation. We find that different braids do not commute for $ν$ near $1$ and $3/2$, with Berry matrices respectively consistent with Ising and Fibonacci anyons. Near $ν=1/2$, the braids commute.
description: 5 pages, 1 figure
HD 144432: a young triple system
Creators: name: Mueller, A.
name: Carmona, A.
name: Ancker, M. E. van den
name: van Boekel, R.
name: Henning, Th.
name: Launhardt, R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present new imaging and spectroscopic data of the young Herbig star HD 144432 A, which was known to be a binary star with a separation of 1.47 arcsec. High-resolution NIR imaging data obtained with NACO at the VLT reveal that HD 144432 B itself is a close binary pair with a separation of 0.1 arcsec. High-resolution optical spectra, acquired with FEROS at the 2.2m MPG/ESO telescope in La Silla, of the primary star and its co-moving companions were used to determine their main stellar parameters such as effective temperature, surface gravity, radial velocity, and projected rotational velocity by fitting synthetic spectra to the observed stellar spectra. The two companions, HD 144432 B and HD 144432 C, are identified as low-mass T Tauri stars of spectral type K7V and M1V, respectively. From the position in the HRD the triple system appears to be co-eval with a system age of 6+/-3 Myr.
description: Accepted for publication in Astronomy & Astrophysics, 4 pages, 4 figures
Theoretical and numerical studies of wave-packet propagation in tokamak plasmas
Creators: name: Lu, Z. X.
name: Zonca, F.
name: Cardinali, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Theoretical and numerical studies of wave-packet propagation are presented to analyze the time varying 2D mode structures of electrostatic fluctuations in tokamak plasmas, using general flux coordinates. Instead of solving the 2D wave equations directly, the solution of the initial value problem is used to obtain the 2D mode structure, following the propagation of wave-packets generated by a source and reconstructing the time varying field. As application, the 2D WKB method is applied to investigate the shaping effects (elongation and triangularity) of tokamak geometry on the lower hybrid wave propagation and absorbtion. Meanwhile, the Mode Structure Decomposition (MSD) method is used to handle the boundary conditions and simplify the 2D problem to two nested 1D problems. The MSD method is related to that discussed earlier by Zonca and Chen [Phys. Fluids B 5, 3668 (1993)], and reduces to the well-known "ballooning formalism" [J. W. Connor, R. J. Hastie, and J. B. Taylor, Phys. Rev. Lett. 40, 396 (1978)], when spatial scale separation applies. This method is used to investigate the time varying 2D electrostatic ITG mode structure with a mixed WKB-full-wave technique. The time varying field pattern is reconstructed and the time asymptotic structure of the wave-packet propagation gives the 2D eigenmode and the corresponding eigenvalue. As a general approach to investigate 2D mode structures in tokamak plasmas, our method also applies for electromagnetic waves with general source/sink terms, either by an internal/external antenna or nonlinear wave interaction with zonal structures.
description: 24 pages, 14 figures
Migrants, asylum seekers and refugees in Greece in the midst of the COVID-19 pandemic
Creators: name: Fouskas, Theodoros
Publisher: name: Comparative Cultural Studies - European and Latin American Perspectives
Year: 2020

description: COVID-19 cases detected in accommodation centers in mainland Greece, while thousands of asylum seekers, refugees, and migrants are living under unsafe and degrading conditions at the camps on the Aegean islands and others in the mainland. They live mostly in overcrowded Reception and Identification Centers (RICs) and accommodation centers under deplorable conditions, the lack of proper shelter, the extremely unhygienic living conditions. Migrants, asylum seekers and refugees living in the RICs faced multiple challenges and vulnerabilities that must be considered when responding to the COVID-19 pandemic.
description: Comparative Cultural Studies - European and Latin American Perspectives, Vol. 5 No. 10 (2020)
Nonequilibrium mesoscopic transport: a genealogy
Creators: name: Das, Mukunda P.
name: Green, Frederick
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Models of nonequilibrium quantum transport underpin all modern electronic devices, from the largest scales to the smallest. Past simplifications such as coarse graining and bulk self-averaging served well to understand electronic materials. Such particular notions become inapplicable at mesoscopic dimensions, edging towards the truly quantum regime. Nevertheless a unifying thread continues to run through transport physics, animating the design of small-scale electronic technology: microscopic conservation and nonequilibrium dissipation. These fundamentals are inherent in quantum transport and gain even greater and more explicit experimental meaning in the passage to atomic-sized devices. We review their genesis, their theoretical context, and their governing role in the electronic response of meso- and nanoscopic systems.
description: 21pp
Self-assisted Amoeboid Navigation in Complex Environments
Creators: name: Hecht, Inbal
name: Levine, Herbert
name: Rappel, Wouter-Jan
name: Ben-Jacob, Eshel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cell Behavior (q-bio.CB)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Background: Living cells of many types need to move in response to external stimuli in order to accomplish their functional tasks; these tasks range from wound healing to immune response to fertilization. While the directional motion is typically dictated by an external signal, the actual motility is also restricted by physical constraints, such as the presence of other cells and the extracellular matrix. The ability to successfully navigate in the presence of obstacles is not only essential for organisms, but might prove relevant in the study of autonomous robotic motion. Methodology/principal findings: We study a computational model of amoeboid chemotactic navigation under differing conditions, from motion in an obstacle-free environment to navigation between obstacles and finally to moving in a maze. We use the maze as a simple stand-in for a motion task with severe constraints, as might be expected in dense extracellular matrix. Whereas agents using simple chemotaxis can successfully navigate around small obstacles, the presence of large barriers can often lead to agent trapping. We further show that employing a simple memory mechanism, namely secretion of a repulsive chemical by the agent, helps the agent escape from such trapping. Conclusions/significance: Our main conclusion is that cells employing simple chemotactic strategies will often be unable to navigate through maze-like geometries, but a simple chemical marker mechanism (which we refer to as "self-assistance") significantly improves success rates. This realization provides important insights into mechanisms that might be employed by real cells migrating in complex environments as well as clues for the design of robotic navigation strategies. The results can be extended to more complicated multi-cellular systems and can be used in the study of mammalian cell migration and cancer metastasis.
Cuarentenas del sur
Creators: name: De Anquín, Ana
name: Lande, Pablo
name: Marder, Celia
Publisher: name: Comparative Cultural Studies - European and Latin American Perspectives
Year: 2020

description: With the title Cuarentenas del sur we take advantage of the current use of the term “cuarentena” to show the existence of the south as a category of exclusion of the global society. Firstly, “cuarentenas” not as an imposed factor for / in the world system which refers to a fragmentation of time and space naturalized as being. And south as cause and effect of not belonging to a society of equal consumers of the market. How are processed in the south the measures that globally oblige to the closure of the housing, at the social distance and at strict hygienic practical distance? We propose to think about the closure to which we are obliged, with, for and pro people and territories we walk: rural communities and urban villas. In this paper we focus on different situations, the villa 21-24 in the neighbourhood of Barracas, in the City of Buenos Aires, less than 5km of the Congress of the Nation and the indigenous communities at the north-east, on the boarders with Bolivia and Chile, at almost 2.000 km from the Federal Capital.
description: Comparative Cultural Studies - European and Latin American Perspectives, Vol. 5 No. 10 (2020)
The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS): The Role of Environment and Self-Regulation in Galaxy Evolution at z ~ 1
Creators: name: Muzzin, Adam
name: Wilson, Gillian
name: Yee, H. K. C.
name: Gilbank, David
name: Hoekstra, Henk
name: Demarco, Ricardo
name: Balogh, Michael
name: van Dokkum, Pieter
name: Franx, Marijn
name: Ellingson, Erica
name: Hicks, Amalia
name: Nantais, Julie
name: Noble, Allison
name: Lacy, Mark
name: Lidman, Chris
name: Rettura, Alessandro
name: Surace, Jason
name: Webb, Tracy
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We evaluate the effects of environment and stellar mass on galaxy properties at 0.85 < z < 1.20 using a 3.6um-selected spectroscopic sample of 797 cluster and field galaxies drawn from the GCLASS survey. We confirm that for galaxies with LogM* > 9.3 the well-known correlations between environment and properties such as star-forming fraction (f_SF), SFR, SSFR, D(4000), and color are already in place at z ~ 1. We separate the effects of environment and stellar mass on galaxies by comparing the properties of star-forming and quiescent galaxies at fixed environment, and fixed stellar mass. The SSFR of star-forming galaxies at fixed environment is correlated with stellar mass; however, at fixed stellar mass it is independent of environment. The same trend exists for the D(4000) measures of both the star-forming and quiescent galaxies and shows that their properties are determined primarily by their stellar mass, not by their environment. Instead, it appears that environment's primary role is to control the fraction of star-forming galaxies. Using the spectra we identify candidate poststarburst galaxies and find that those with 9.3 < LogM* < 10.7 are 3.1 +/- 1.1 times more common in high-density regions compared to low-density regions. The clear association of poststarbursts with high-density regions as well as the lack of a correlation between the SSFRs and D(4000)s of star-forming galaxies with their environment suggests that at z ~ 1 the environmental-quenching timescale must be rapid. Lastly, we construct a simple quenching model which demonstrates that the lack of a correlation between the D(4000) of quiescent galaxies and their environment results naturally if self quenching dominates over environmental quenching at z > 1, or if the evolution of the self-quenching rate mirrors the evolution of the environmental-quenching rate at z > 1, regardless of which dominates.
description: 26 pages, 15 figures, accepted for publication in ApJ
10 Years On: The Future Of Design Research
Creators: name: Maier, Anja
Publisher: name: Zenodo
Year: 2016
Subjects: design research
future
engineering design
engineering systems

description: WORKSHOP DESIGN RESEARCH: 10 YEARS ON

International Design Conference – DESIGN16 – 16.5.16

Professor Anja Maier

Technical University of Denmark

www.es.man.dtu.dk
description: Invited talk at the 14th International Design Conference – DESIGN16
Direct Observation of Massless Domain Wall Dynamics in Nanostripes with Perpendicular Magnetic Anisotropy
Creators: name: Vogel, Jan
name: Bonfim, Marlio
name: Rougemaille, Nicolas
name: Boulle, Olivier
name: Miron, Ioan Mihai
name: Auffret, Stéphane
name: Rodmacq, Bernard
name: Gaudin, Gilles
name: Cezar, J. C.
name: Sirotti, Fausto
name: Pizzini, Stefania
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Domain wall motion induced by nanosecond current pulses in nanostripes with perpendicular magnetic anisotropy (Pt/Co/AlO$_x$) is shown to exhibit negligible inertia. Time-resolved magnetic microscopy during current pulses reveals that the domain walls start moving, with a constant speed, as soon as the current reaches a constant amplitude, and no or little motion takes place after the end of the pulse. The very low 'mass' of these domain walls is attributed to the combination of their narrow width and high damping parameter $α$. Such a small inertia should allow accurate control of domain wall motion, by tuning the duration and amplitude of the current pulses.
Canadian student-athletes on the move : narratives of transition through time and space
Creators: name: Falls, Dominique
Publisher: name: University of British Columbia
Year: 2010

description: Every year, approximately two thousand Canadian student-athletes, aged 17-23, cross the border to pursue their university education in the United States (Barnes, 2008). However, there is a scarcity of in-depth research that considers the experiences of these athletes. More pertinently, little is known about how student-athlete movement can be understood in relation to research on ‘detraditionalization’ and ‘individualization’ which suggests that the influence of traditional ties (e.g. class, gender, ethnicity) on young people’s experiences and identities is diminishing. With these concerns in mind a study was designed that explored the following two research questions: 1) how might processes of detraditionalization and individualization inform an understanding of the transition experiences of female Canadian student-athletes moving to the United States for their university education?; 2) how are female Canadian student-athletes’ experiences and identities shaped by the transitions they are faced with in their move to and time spent in the United States? To pursue these questions, in-depth interviews were conducted with 12 Canadian female student-athletes who pursued their education at and graduated from a United States’ university. Key findings included: the women’s decisions to attend college were influenced by an interrelated set of sport-related factors (e.g. a desire to pursue sport at the ‘highest level’) and non-sport factors (e.g. to break free from the familiarity of home); transition experiences were complex and context dependent and were also influenced by sport-related factors (e.g. relationships with the coach and teammates) and non-sport factors (e.g. degree of culture shock). The research also showed that the women used diverse strategies to deal with their disconnection from home (e.g. use of various communication technologies) and that negative experiences were commonly reframed in positive terms. In sum, the women experienced processes of individualization and detraditionalization but the structure of the sports team provided some of the stabilizing influences thought to be diminishing in the contemporary moment. This thesis concludes with a discussion of ways that these findings could be useful for athletes who are experiencing various forms of transition, and the coaches, peers, parents, and others who are attempting to support them.
Quantum path integral simulation of isotope effects in the melting temperature of ice Ih
Creators: name: Ramirez, R.
name: Herrero, C. P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The isotope effect in the melting temperature of ice Ih has been studied by free energy calculations within the path integral formulation of statistical mechanics. Free energy differences between isotopes are related to the dependence of their kinetic energy on the isotope mass. The water simulations were performed by using the q-TIP4P/F model, a point charge empirical potential that includes molecular flexibility and anharmonicity in the OH stretch of the water molecule. The reported melting temperature at ambient pressure of this model (T = 251 K) increases by 6.5+-0.5 K and 8.2+-0.5 K upon isotopic substitution of hydrogen by deuterium and tritium, respectively. These temperature shifts are larger than the experimental ones (3.8 K and 4.5 K, respectively). In the classical limit, the melting temperature is nearly the same as that for tritiated ice. This unexpected behavior is rationalized by the coupling between intermolecular interactions and molecular flexibility. This coupling makes the kinetic energy of the OH stretching modes larger in the liquid than in the solid phase. However the opposite behavior is found for intramolecular modes, which display larger kinetic energy in ice than in liquid water.
description: 14 pages, 13 figures, 5 tables
LPV system identification and order reduction with application to turbocharged SI engines
Creators: name: Schulz, Erik
Publisher: name: Dr. Hut
Year: 2022
Subjects: subject: Linear parameter-varying (LPV) systems
subject: System identification
subject: Order reduction
subject: SI Engine
classificationCode: 004
subject: Informatik
classificationCode: 600
subject: Technik

description: Grundlage für den modellbasierten Entwurf von linear parameterveränderlichen (LPV) Reglern ist ein Modell von der zu regelnden Strecke. Bei industriellen Anwendungen fehlen jedoch häufig Modelle, die das Streckenverhalten gut annähern. In dieser Arbeit werden Methoden zur Identifikation und Ordnungsreduktion von zeitdiskreten LPV Modellen behandelt. Sie werden auf Messungen von einem realen System, dem Luftpfad eines aufgeladenen Ottomotors, angewendet und weisen im Vergleich zu bestehenden Methoden eine verbesserte Recheneffizienz auf und/oder liefern Modelle mit höherer Genauigkeit. Darüber hinaus sind die erhaltenen LPV Modelle für etablierte Reglerentwurfswerkzeuge geeignet.
description: The basis for the model-based design of linear parameter-varying (LPV) controllers is a model of the controlled system. However, models that approximate the system behavior well are often missing in industrial applications. In this thesis, methods for the identification and order reduction of discrete-time LPV models are presented. They are applied to measurements from a real system, the air path of a turbocharged gasoline engine, and show improved computational efficiency and/or provide models of higher accuracy compared to existing methods. Furthermore, the resulting LPV models are suitable for established control design tools.
Hyperon Polarization, Transversity and LHC Physics
Creators: name: Goldstein, Gary R.
name: Liuti, Simonetta
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Longstanding puzzles in spin physics can be confronted at the high energies of the LHC. Will large s-quark and c-quark polarization be observed through heavy hyperon production? Top quarks are expected to have significant polarization - single spin asymmetries. How can such observations sort out possible QCD mechanisms? Leptoproduction provides a means to access those mechanisms. TMDs, GPDs and Fracture Functions all provide different model approaches to the polarization phenomena. Their implications will be described.
description: 6 pages, 2 figures, presentation at Transversity 2011, Losinj, Croatia (revised comment for ref.9)
Tracer study of the general circulation of the stratosphere with particular reference to "Starfish Prime" Cadmium-109
Creators: name: Ezemenari, Fidelis R. C.
Publisher: name: University of Calgary
Year: 1967
Subjects: subject: QC 931 E94 1967
subject: Atmosphere
subject: Radioactive tracers

description: Bibliography: p. 127-131.