cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Self-energy effects in electronic Raman spectra of doped cuprates due to magnetic fluctuations
Creators: name: Zeyher, Roland
name: Greco, Andrés
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present results for magnetic excitations in doped copper oxides using the random phase approximation and itinerant electrons. In the [1,0] direction the observed excitations resemble dispersive quasi-particles both in the normal and superconducting state similar as in recent resonant inelastic X-ray scattering (RIXS) experiments. In the [1,1] direction the excitations form, except for the critical region near the antiferromagnetic wave vector ${\bf Q}=(π,π)$, only very broad continua. Using the obtained spin propagators we calculate electron self-energies and their effects on electronic Raman spectra. We show that the recently observed additional peak at about twice the pair breaking in B$_{1g}$ symmetry below T$_c$ in HgBa$_2$CuO$_{4+δ}$ can be explained as a self-energy effect where a broken Cooper pair and a magnetic excitation appear as final states. The absence of this peak in B$_{2g}$ symmetry, which probes mainly electrons near the nodal direction, is explained by their small self-energies compared to those in the antinodal direction.
description: 5 pages, 5 figures
title:  La sfida della didattica “distante” per i (futuri) docenti L2 nella scuola primaria. Dall’emergenza alla coscienza
Creators: name: Leproni , Raffaella
Publisher: name: RomaTrE-Press
Year: 2021

description: La pandemia Covid-19 ha comportato conseguenze e trasformazioni prefigurando scenari inediti sul piano economico, sociale e personale, determinando anche nel campo della ricerca l’urgenza di esplorarne le ricadute. Il volume dà quindi conto delle indagini svolte e in corso, sin dai primi giorni del lockdown, dai docenti e dai collaboratori del Dipartimento di Scienze della Formazione dell’Università Roma Tre, toccando i temi più diversi: dalla didattica a distanza, all’università e nei diversi ordini di scuola, al futuro dei servizi di orientamento, dal lavoro socio-educativo nelle varie tipologie di servizi all’impatto della pandemia sulle comunità, dalle narrazioni ai linguaggi artistici a contrasto di quest’emergenza non solo sanitaria. Si sono così esplorate le diverse educazioni possibili, riassegnando centralità ai processi formativi e al benessere delle persone, provando a tratteggiare nuovi paradigmi e prospettive.
description: Nel secondo semestre 2020-21, nell’impossibilità di condurre corsi in presenza a causa dell’emergenza pandemica, il Laboratorio di Lingua Inglese V anno per Scienze della Formazione Primaria tenuto a Roma Tre è stato rimodellato per permettere agli studenti di sviluppare le proprie competenze linguistiche e metodologiche, attraverso un esempio fattivo e trasferibile di e-learning e smart-teaching, in una prospettiva interculturale e inclusiva.
Leptogenys Roger 1861
Creators: name: Forel, A.
Publisher: name: L'Imprimerie Nationale
Year: 1891
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Leptogenys

description: 2. LEPTOGENYS MAXILLOSA, Smith.
Ponera maxillosa, Smith, Catalogue of the British Muséum (1858).
[[worker]]. Longueur 7 mill. Extrêmement semblable à l'espèce précédente, dont elle se distingue (outre sa taille plus petite) par les caractères suivants:
Tête aussi longue que large, à peine plus large devant que derrière. Mandibules plus courtes, un peu plus épaisses, moins brusquement et plus largement courbées à leur base. Le bord antérieur du dessous de la tête n'a que deux dents très petites et étroites. Epistome avec un lobe antérieur moins grand, un peu moins avancé, obtusément caréné et densement strié en long (mat) au milieu, même sur la carène. Les yeux sont situés au tiers antérieur de la tête. N œ ud du pédicule beaucoup plus haut que large, plus large que long, bien plus aplati et plus large sur sa face antérieure, plus squamiforme. La ponctuation superposée est plus grossière et plus irrégulière (plus forte sur certaines parties, plus faible au milieu du thorax et sur les derniers segments abdominaux). L'aspect est moins pruineux (pubescence plus faible) et la couleur plus claire, d'un noir un peu brunâtre. Les mandibules, les pattes, les antennes et le devant des arêtes frontales sont entièrement roussâtres. Appareil de stridulation comme chez la L. falcigera.
[[male]]. Longueur 6 mill. Finement ponctué, noir et légèrement luisant. Yeux et ocelles très grands. Pattes et antennes d'un brun ferrugineux. Extrémité de l'abdomen et des antennes, tarses et articulations des pattes ferrugineux. Ailes teintées de brunâtre (d'après Smith).
Je dois à l'obligeance de M. André la connaissance de cette espèce que les descriptions de Roger et de Smith ne permettent guère de distinguer de la L. falcigera. M. André l'a reçue de Nosibé; Smith et Roger l'avaient reçue de l'île Maurice.
description: Published as part of Forel, A., 1891, Histoire naturelle des Hymenopteres. Deuxieme partie: Les Formicides., pp. 1-231 in Histoire Physique, Naturelle et Politique de Madagascar., Paris :L'Imprimerie Nationale on page 112, DOI: 10.5281/zenodo.9896
Beyond linear gyrocenter polarization in gyrokinetic theory
Creators: name: Brizard, Alain J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The concept of polarization in gyrokinetic theory is clarified and generalized to include contributions from the guiding-center (zeroth-order) polarization as well as the nonlinear (second-order) gyrocenter polarization. The guiding-center polarization, which appears as the antecedent (zeroth-order) of the standard linear (first-order) gyrocenter polarization, is obtained from a modified guiding-center transformation. The nonlinear gyrocenter polarization is derived either variationally from the third-order gyrocenter Hamiltonian or directly by gyrocenter push-forward method.
description: 11 pages, 1 figure
FAIR OER. Rezept zur FAIRedelung von Open Educational Ressources
Creators: name: Bruhn, Kai-Christian
name: Linde, Lennart
name: Westrich, Victor
Publisher: name: Zenodo
Year: 2023
Subjects: Research Data Management
FAIR
OER
NFDI

description: Poster presented at the NFDI4Objects Community Meeting 2023
Hidden in the haystack: how many globular clusters are missing in the Milky Way?
Creators: name: Gran, Felipe
Publisher: name: Zenodo
Year: 2023

description: Globular clusters (GCs) are dense agglomerations of gravitationally bound stars formed roughly at the same epoch and constitute an essential part of galaxies over the whole mass range.Given their old ages (mostly >10 Gyr), they are usually considered fossil records of the formation and evolution of their host galaxies, in particular, they have been used to identify merging events involved in the Milky Way mass assembly history.Up to date, almost 170 GCs have been confirmed (considering both proper motions and radial velocity measurements) linked to the Galaxy.Historically, GCs have been employed as a crucial stellar laboratory given that distances, metallicities, masses and approximate ages can be derived from their stellar populations.An important part of the existing knowledge about stellar evolution comes from clusters (either GCs or open clusters, OCs).This poster will show our most recent effort to complete the census of the Milky Way GCs, providing confirmation for five recently discovered clusters.Additionally, a first-order estimation of the number of missing GCs (especially behind the Galactic bulge) will be elaborated alongside the observational low-mass limit of Galactic GCs according to their environment.
Superradiant instabilities in astrophysical systems
Creators: name: Witek, Helvi
name: Cardoso, Vitor
name: Ishibashi, Akihiro
name: Sperhake, Ulrich
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Light bosonic degrees of freedom have become a serious candidate for dark matter. The evolution of these fields around curved spacetimes is poorly understood but is expected to display interesting effects. In particular, the interaction of light bosonic fields with supermassive black holes, key players in most galaxies, could provide colourful examples of superradiance and nonlinear bosenova-like collapse. In turn, the observation of spinning black holes is expected to impose stringent bounds on the mass of putative massive bosonic fields in our universe. Our purpose here is to present a comprehensive study of the evolution of linearized massive scalar and vector fields in the vicinities of rotating black holes. For a certain boson field mass range, the field can become trapped in a potential barrier outside the horizon and transition to a bound state. Because there are a number of such quasi-bound states, the generic outcome is an amplitude modulated sinusoidal, or beating, signal. We believe that the appearance of such beatings has gone unnoticed in the past, and in fact mistaken for exponential growth. The amplitude modulation of the signal depends strongly on the relative excitation of the overtones, which in turn is strongly tied to the bound-state geography. For the first time we explore massive vector fields in generic BH background which are hard, if not impossible, to separate in the Kerr background. Our results show that spinning BHs are generically strongly unstable against massive vector fields.
description: 29 pages, 13 figures, matched to published version
The fractal p calculation of program for the community samples in Brown University's foraminiferal database
Creators: name: Gao, Junfeng
name: su, qiang
Publisher: name: figshare
Year: 2021
Subjects: subject: 60202 Community Ecology (excl. Invasive Species Ecology)
subject: FOS: Biological sciences

description: The files includes the fractal p calculation of program for the community samples in Brown University's foraminiferal database, and the empirical temperature - fractal p relationships (the mean fractal p and T in 5° × 5° grids)
The nonlinear magnetoinductive dimer
Creators: name: Molina, Mario I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We examine a nonlinear magnetoinductive dimer and compute its linear and nonlinear symmetric, antisymmetric and asymmetric modes in closed-form, in the rotating-wave approximation. A linear stability analysis of these modes reveals that the asymmetric mode is always stable, for any allowed value of the coupling parameter and for both, hard and soft nonlinearity. A numerical computation of the dimer dynamics reveals a magnetic energy selftrapping whose threshold increases for increasing dimer coupling.
description: 4 double-column pages, 6 figures, submitted
Longitudinal analysis of gene expression profiles using functional mixed-effects models
Creators: name: Berk, Maurice
name: Hemingway, Cheryl
name: Levin, Michael
name: Montana, Giovanni
Publisher: name: arXiv
Year: 2013
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: In many longitudinal microarray studies, the gene expression levels in a random sample are observed repeatedly over time under two or more conditions. The resulting time courses are generally very short, high-dimensional, and may have missing values. Moreover, for every gene, a certain amount of variability in the temporal profiles, among biological replicates, is generally observed. We propose a functional mixed-effects model for estimating the temporal pattern of each gene, which is assumed to be a smooth function. A statistical test based on the distance between the fitted curves is then carried out to detect differential expression. A simulation procedure for assessing the statistical power of our model is also suggested. We evaluate the model performance using both simulations and a real data set investigating the human host response to BCG exposure.
Axion response in Weyl semimetals
Creators: name: Chen, Y.
name: Wu, Si
name: Burkov, A. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Weyl semimetal is a new phase of matter that provides the first solid state realization of chiral Weyl fermions. Most of its unique physics is a consequence of chiral anomaly, namely nonconservation of the number of particles of a given chirality. Mathematically, this is expressed in the appearance of the so called $θ$-term in the action of the electromagnetic field, when the Weyl fermions are integrated out. Recently, however, it has been suggested that the analogy between the chiral fermions of quantum field theory with unbounded linear dispersion, and their solid state realization with a dispersion naturally bounded by the bandwidth and crystal momentum defined only within the first Brillouin zone, holds only in a restricted sense, with parts of the $θ$-term absent. Here we demonstrate that this is not the case. We explicitly derive the $θ$-term for a microscopic model of a Weyl semimetal by integrating out fermions coupled to electromagnetic field, and show that the result has exactly the same form as in the case of relativistic chiral fermions.
description: 6+ pages, 1 figure, published version
Quench Dynamics and Emergence of Phase Separation in Two-Component Atomic Bose Gases at Zero Temperature and above the BEC Critical Temperature
Creators: name: Chien, Chih-Chun
name: Cooper, Fred
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the dynamics of two-component atomic Bose gases initially in a mixture encountering a sudden quench of the inter-species interactions. The dynamics above the critical temperature $T_c$ is studied using a leading order large-N approximation that predicted a phase transition from mixing to phase separation as a function of the inter-species coupling. Here we explore the dynamics of this phase transition following a quench and compare our results to those found at zero temperature using the time-dependent Gross-Pitaevskii equations which ignore quantum and thermal fluctuations. In the regime above $T_c$ where no condensate is present, however, the time evolution of the densities following the quench exhibits features similar to that found at zero temperature where only the condensates contribute to the densities. When the inter-species interaction jumps above the critical value, we observe dynamical transitions from a homogeneous mixture to a phase-separated structure for both cases. Our simulations suggest that at temperatures above $T_c$ where no condensate is present this dynamical transition should still be observable in experiments.
description: 5 pages, 2 figures
The fractal p calculation of program for the community samples in Brown University's foraminiferal database
Creators: name: Gao, Junfeng
name: su, qiang
Publisher: name: figshare
Year: 2021
Subjects: subject: 60202 Community Ecology (excl. Invasive Species Ecology)
subject: FOS: Biological sciences

description: The files includes the fractal p calculation of program for the community samples in Brown University's foraminiferal database, and the empirical temperature - fractal p relationships (the mean fractal p and T in 5° × 5° grids)
Conductivity in the Heisenberg chain with next to nearest neighbor interaction
Creators: name: Mastropietro, Vieri
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider a spin chain given by the XXZ model with a weak next to nearest neighbor perturbation which breaks its exact integrability. We prove that such system has an ideal metallic behavior (infinite conductivity), by rigorously establishing strict lower bounds on the zero temperature Drude weight which are strictly positive. The proof is based on Exact Renormalization Group methods allowing to prove the convergence of the expansions and to fully take into account the irrelevant terms, which play an essential role in ensuring the correct lattice symmetries. We also prove that the Drude weight verifies the same parameter-free relations as in the absence of the integrability breaking perturbation.
The program and results of fractal p calculation for the community samples in Brown University's foraminiferal database
Creators: name: Gao, Junfeng
name: su, qiang
Publisher: name: figshare
Year: 2021
Subjects: subject: 60202 Community Ecology (excl. Invasive Species Ecology)
subject: FOS: Biological sciences

description: The files include the calculation program and the calculation results of 《The entropy hypothesis: a new interpretation of latitudinal diversity gradient》
Code1: Calculate the fractal p for the community samples in Brown University's foraminiferal database, and establish empirical temperature - fractal p relationships (the mean fractal p and T in 5° × 5° grids)
Code2: Establish the latitude pattern of fractal pCode3: Establish the relationships between temperature and species diversity using the representative metrics of diversity (Species Richness (S), Shannon - Weaver index (H'), Simpson’s index (D), Fisher’s α (α))Table 1: Mean fractal p and SST in 5°×5° grids.Table 2: Fractal p and the goodness of fit (R2) for original samples (BFD)Table 3: The percentage distribution of the goodness of fit (R2) for Fractal model
Characterising gravitational wave stochastic background anisotropy with Pulsar Timing Arrays
Creators: name: Mingarelli, Chiara M. F.
name: Sidery, Trevor
name: Mandel, Ilya
name: Vecchio, Alberto
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Detecting a stochastic gravitational wave background, particularly radiation from individually unresolvable super-massive black hole binary systems, is one of the primary targets for Pulsar Timing Arrays. Increasingly more stringent upper limits are being set on these signals under the assumption that the background radiation is isotropic. However, some level of anisotropy may be present and the characterisation of the power at different angular scales carries important information. We show that the standard analysis for isotropic backgrounds can be generalised in a conceptually straightforward way to the case of generic anisotropic background radiation by decomposing the angular distribution of the gravitational wave power on the sky into multipole moments. We introduce the concept of generalised overlap reduction functions which characterise the effect of the anisotropy multipoles on the correlation of the timing residuals from the pulsars timed by a Pulsar Timing Array. In a search for a signal characterised by a generic anisotropy, the generalised overlap reduction functions play the role of the so-called Hellings and Downs curve used for isotropic radiation. We compute the generalised overlap reduction functions for a generic level of anisotropy and Pulsar Timing Array configuration. We also provide an order of magnitude estimate of the level of anisotropy that can be expected in the background generated by super-massive black hole binary systems.
description: 12 pages plus 5 page Appendix. Accepted to PRD
Taming the Beast: Adopting a Collaborative Email Inbox
Creators: name: Major, Colleen M.
name: Marcin, Susan E.
Publisher: name: Columbia University
Year: 2018
Subjects: Electronic mail messages
Public services (Libraries)
Academic libraries--Customer services
Library administration

description: This poster addresses the move to a Google Collaborative Inbox for departmental aliases; this use of a collaborative technology focused our workflows, increased our email productivity, and allowed for valuable data analysis.
The Influence of Global Self-Heating on the Yarkovsky and YORP Effects
Creators: name: Rozitis, Ben
name: Green, Simon F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present an adaptation of the ATPM to simultaneously predict the Yarkovsky and YORP effects in the presence of global self-heating that occurs within the large concavities of irregularly shaped asteroids, which has been neglected or dismissed in all previous models. It is also combined with rough surface thermal-infrared beaming effects, which have been previously shown to enhance the Yarkovsky-orbital-drift and dampen on average the YORP-rotational-acceleration by orders of several tens of per cent. Tests on all published concave shape models of near-Earth asteroids, and also on one hundred Gaussian-random-spheres, show that the Yarkovsky effect is sensitive to shadowing and global self-heating effects at the few per cent level or less. For simplicity, Yarkovsky models can neglect these effects if the level of accuracy desired is of this order. Unlike the Yarkovsky effect, the YORP effect can be very sensitive to shadowing and global self-heating effects. Its sensitivity increases with decreasing relative strength of the YORP-rotational-acceleration, and doesn't appear to depend greatly on the degree of asteroid concavity. Global self-heating tends to produce a vertical offset in an asteroid's YORP-rotational-acceleration versus obliquity curve which is in opposite direction to that produced by shadowing effects. It also ensures that at least one critical obliquity angle exists at which zero YORP-rotational-acceleration occurs. Global self-heating must be included for accurate predictions of the YORP effect if an asteroid exhibits a large shadowing effect. If global self-heating effects are not included then it is found in ~75 per cent of cases that better predictions are produced when shadowing is also not included. Furthermore, global self-heating has implications for reducing the sensitivity of the YORP effect predictions to detailed variations in an asteroid's shape model.
description: 39 pages, 12 figures, 3 tables. Accepted by MNRAS
title: Sales Management by Providing Mobile Access to a Desktop Enterprise Resource Planning System
Creators: name: Vasilev, Julian
name: Kehayova-Stoycheva, Maria
Publisher: name: TEM Journal
Year: 2019

description: The purpose of this article is to argument the need of extending the functionality of a desktop Enterprise Resource Planning (ERP) system by providing web-based access to it and describing the design and its implementation. The thematic content of the article is interdisciplinary. It concerns directly salespersons and sales managers because salespersons need web-based access to their desktop ERP systems. It concerns IT companies because they have a specific software solution – web-based software which provides web access to the database of a desktop ERP system. To illustrate the process of extending the functionality of a desktop ERP system, we have chosen MS Dynamics Navision as a popular and well-known ERP system. The practical implications of this paper concern other ERP systems, not only MS Dynamics Navision. The findings of this paper are useful for sales managers and salespersons that use desktop ERP systems and IT companies that upgrade ERP systems.
title: Assessment of the Appropriateness of the Price Control of High-Tech Industrial Holding
Creators: name: Cherner, Natalia
Publisher: name: TEM Journal
Year: 2019

description: The article presents an assessment of the feasibility of price management based on the analysis of methods of management impacts on the price management of high-tech industrial holding. Here you can find the types of price management and an example of experimental evidence of its feasibility.
title: Production Efficiency in Company with Small Series Production
Creators: name: Daneshjo, Naqib
name: Malega, Peter
name: Dudáš Pajerská, Erika
Publisher: name: TEM Journal
Year: 2019

description: This paper elaborates the manufacturing process and efficiency in detail – what influenced the production systems in the past but also what they expect in the future. Also, the individual criteria according to which we can break down the production and the factors acting on it. The main efficiency calculation technique is the overall efficiency of the OEE (Overall Equipment Effectiveness) and its extension. There are clearly defined terms such as productivity, efficiency and effectiveness. The aim of this work is to make surface treatments more efficient, to increase savings and productivity.
Effect of Unfolding on the Spectral Statistics of Adjacency Matrices of Complex Networks
Creators: name: Abuelenin, Sherif M.
name: Abul-Magd, Adel Y.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Random matrix theory is finding an increasing number of applications in the context of information theory and communication systems, especially in studying the properties of complex networks. Such properties include short-term and long-term correlation. We study the spectral fluctuations of the adjacency of networks using random-matrix theory. We consider the influence of the spectral unfolding, which is a necessary procedure to remove the secular properties of the spectrum, on different spectral statistics. We find that, while the spacing distribution of the eigenvalues shows little sensitivity to the unfolding method used, the spectral rigidity has greater sensitivity to unfolding.
description: Complex Adaptive Systems Conference 2012
A resonant family of dynamically cold small bodies in the near-Earth asteroid belt
Creators: name: Marcos, C. de la Fuente
name: Marcos, R. de la Fuente
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Near-Earth objects (NEOs) moving in resonant, Earth-like orbits are potentially important. On the positive side, they are the ideal targets for robotic and human low-cost sample return missions and a much cheaper alternative to using the Moon as an astronomical observatory. On the negative side and even if small in size (2-50 m), they have an enhanced probability of colliding with the Earth causing local but still significant property damage and loss of life. Here, we show that the recently discovered asteroid 2013 BS45 is an Earth co-orbital, the sixth horseshoe librator to our planet. In contrast with other Earth's co-orbitals, its orbit is strikingly similar to that of the Earth yet at an absolute magnitude of 25.8, an artificial origin seems implausible. The study of the dynamics of 2013 BS45 coupled with the analysis of NEO data show that it is one of the largest and most stable members of a previously undiscussed dynamically cold group of small NEOs experiencing repeated trappings in the 1:1 commensurability with the Earth. This new resonant family is well constrained in orbital parameter space and it includes at least 10 other transient members: 2003 YN107, 2006 JY26, 2009 SH2 and 2012 FC71 among them. 2012 FC71 represents the best of both worlds as it is locked in a Kozai resonance and is unlikely to impact the Earth. Objects in this group could be responsible for the production of Earth's transient irregular natural satellites.
description: 5 pages, 5 figures, 2 embedded animations, 2 tables, abstract abridged. Revised to reflect final version published in MNRAS Letters
title: Operational Production Management Model of Competitive Products in Mechanical Engineering
Creators: name: V. Tikhonov, Gennady
Publisher: name: TEM Journal
Year: 2019

description: There is an improvement of the organizational and economic model of operational management of the production of competitive products, which combines and discloses the systematic use of interconnected key principles, methods, tools, forms and processes of operational management in the implementation of production tasks of a machine-building enterprise.
Sum rule violation in self-consistent hybridization expansions
Creators: name: Rüegg, Andreas
name: Gull, Emanuel
name: Fiete, Gregory A.
name: Millis, Andrew J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that for multi-orbital quantum impurity models the non-crossing approximation and one-crossing approximation versions of the self-consistent hybridization expansions violate the sum rules relating the coefficients of the high-frequency expansion of the self energy and the product of the self energy and Green function to thermodynamic expectation values. Comparison of non-crossing/one-crossing results to numerically exact quantum Monte-Carlo calculations shows that the consistency with sum rules provides a useful estimate of the reliability of the approximations. The sum rule violations are more pronounced, and therefore the quality of the non-crossing/one-crossing approximation is poorer, in situations with multiple orbitals and away from particle-hole symmetry but becomes less severe as the correlation strength increases. The one crossing approximation is markedly superior to the non-crossing approximation.
description: 11 pages, 11 figures, references added, introduction modified
Cumulative physical uncertainty in modern stellar models. II. The dependence on the chemical composition
Creators: name: Valle, G.
name: Dell'Omodarme, M.
name: Moroni, P. G. Prada
name: Degl'Innocenti, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We extend our work on the effects of the uncertainties on the main input physics for the evolution of low-mass stars. We analyse the dependence of the cumulative physical uncertainty affecting stellar tracks on the chemical composition. We calculated more than 6000 stellar tracks and isochrones, with metallicity ranging from Z = 0.0001 to 0.02, by changing the following physical inputs within their current range of uncertainty: 1H(p,nu e+)2H, 14N(p,gamma)15O and triple-alpha reaction rates, radiative and conductive opacities, neutrino energy losses, and microscopic diffusion velocities. The analysis was performed using a latin hypercube sampling design. We examine in a statistical way the dependence on the variation of the physical inputs of the turn-off (TO) luminosity, the central hydrogen exhaustion time (t_H), the luminosity and the helium core mass at the red-giant branch (RGB) tip, and the zero age horizontal branch (ZAHB) luminosity in the RR Lyrae region. For the stellar tracks, an increase from Z = 0.0001 to Z = 0.02 produces a cumulative physical uncertainty in TO luminosity from 0.028 dex to 0.017 dex, while the global uncertainty on t_H increases from 0.42 Gyr to 1.08 Gyr. For the RGB tip, the cumulative uncertainty on the luminosity is almost constant at 0.03 dex, whereas the one the helium core mass decreases from 0.0055 M_sun to 0.0035 M_sun. The dependence of the ZAHB luminosity error is not monotonic with Z, and it varies from a minimum of 0.036 dex at Z = 0.0005 to a maximum of 0.047 dex at Z = 0.0001. Regarding stellar isochrones of 12 Gyr, the cumulative physical uncertainty on the predicted TO luminosity and mass increases respectively from 0.012 dex to 0.014 dex and from 0.0136 M_sun to 0.0186 M_sun. Consequently, for ages typical of galactic globular clusters, the uncertainty on the age inferred from the TO luminosity increases from 325 Myr to 415 Myr.
description: Accepted for publication in A&A
Kohn-Sham density functional theory for quantum wires in arbitrary correlation regimes
Creators: name: Malet, Francesc
name: Mirtschink, André
name: Cremon, Jonas C.
name: Reimann, Stephanie M.
name: Gori-Giorgi, Paola
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use the exact strong-interaction limit of the Hohenberg-Kohn energy density functional to construct an approximation for the exchange-correlation term of the Kohn-Sham approach. The resulting exchange-correlation potential is able to capture the features of the strongly-correlated regime without breaking the spin or any other symmetry. In particular, it shows "bumps" (or barriers) that give rise to charge localization at low densities and that are a well-known key feature of the exact Kohn-Sham potential for strongly-correlated systems. Here we illustrate this approach for the study of both weakly and strongly correlated model quantum wires, comparing our results with those obtained with the configuration interaction method and with the usual Kohn-Sham local density approximation.
description: 12 pages, 6 figures. Submitted to Phys. Rev. B
VLT/X-Shooter Near-Infrared Spectroscopy and HST Imaging of Gravitationally-Lensed z~2 Compact Quiescent Galaxies
Creators: name: Geier, Stefan
name: Richard, Johan
name: Man, Allison
name: Krühler, Thomas
name: Toft, Sune
name: Marchesini, Danilo
name: Fynbo, Johan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Quiescent massive galaxies at z~2 are thought to be the progenitors of present-day massive ellipticals. Observations revealed them to be extraordinarily compact. The determination of stellar ages, star formation rates and dust properties via spectroscopic measurements has up to now only been feasible for the most luminous and massive specimens (~3x M*). Here we present a spectroscopic study of two near-infrared selected galaxies which are close to the characteristic stellar mass M* (~0.9x M* and ~1.3x M*) and whose observed brightness has been boosted by the gravitational lensing effect. We measure the redshifts of the two galaxies to be z=1.71\pm0.02 and z=2.15\pm0.01. By fitting stellar population synthesis models to their spectro-photometric SEDs we determine their ages to be 2.4^{+0.8}_{-0.6} Gyr and 1.7\pm0.3 Gyr, respectively, which implies that the two galaxies have higher mass-to-light ratios than most quiescent z~2 galaxies in other studies. We find no direct evidence for active star-formation or AGN activity in either of the two galaxies, based on the non-detection of emission lines. Based on the derived redshifts and stellar ages we estimate the formation redshifts to be z=4.3^{+3.4}_{-1.2} and z=4.3^{+1.0}_{-0.6}, respectively. We use the increased spatial resolution due to the gravitational lensing to derive constraints on the morphology. Fitting Sersic profiles to the de-lensed images of the two galaxies confirms their compactness, with one of them being spheroid-like, and the other providing the first confirmation of a passive lenticular galaxy at a spectroscopically derived redshift z~2.
description: accepted for publication in ApJ
Von Rembrandt bis Rethel. Miniaturen, Handzeichnungen, Aquarelle (Ausstellungsbericht)
Creators: name: Puvogel, Renate
Publisher: name: Aachener Kunstblätter
Year: 2017

description: -
description: Aachener Kunstblätter, Bd. 47 (1976-1977): Aachener Kunstblätter
Sublinear but Never Superlinear Preferential Attachment by Local Network Growth
Creators: name: Gabel, Alan
name: Redner, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We investigate a class of network growth rules that are based on a redirection algorithm wherein new nodes are added to a network by linking to a randomly chosen target node with some probability 1-r or linking to the parent node of the target node with probability r. For fixed 0
description: 10 pages, 3 figure, IOP style; version2: one reference corrected; version 3 (final version for JSTAT): some minor typos and citation errors fixed
title: Clean energy access: gender disparity, health, and labor supply
Creators: name: Verma, Anjali P.
name: Imelda
Publisher: name: Graduate Institute of International and Development Studies
publisherIdentifier: https://ror.org/007ygn379
publisherIdentifierScheme: ROR
Year: 2022

description: Graduate Institute of International and Development Studies Working Paper ; no. 11/2022
Alfabetismo Emergente en preescolar: guía, prácticas y estrategias dirigidas a docentes y familias
Creators: name: ANGELA PATRICIA, SAMACA TORRES
name: DIANA  ROCIO, DEVIA MENDIETA
name: XIOMY LORENA, ZAMUDIO CIFUENTES
Publisher: name: Zenodo
Year: 2024

description: El Colegio De La Salle atiende a la construcción de significado y sentido como herramienta fundamental para la adquisición de conocimiento y desarrollo del lenguaje por medio de la lectura, escritura y oralidad, que permite favorecer las habilidades comunicativas, por ello se plantea un modelo para la adquisición del código alfabético cuyo referente teórico estárelacionado con los planteamientos de Lev Vigotsky, Jean Piaget, Emilia Ferreiro y Ana Teberosky, de la misma forma se ha implementado en la didáctica de las clases herramientas de las metodologías activas, el aprendizaje cooperativo y colaborativo. Todo lo anterior aplicado por los docentes del preescolar del colegio.Sin embargo, consideramos importante que las prácticas pedagógicas se fortalezcan permitiendo vincular más herramientas que permitan facilitar y mejorar la apropiación de la lecto escritura en nuestros niños y niñas del preescolar, por lo anterior pretendemos con este proyecto de investigación diseñar una cartilla dirigida a docentes y padres de familia que sirvacomo una herramienta en la adquisición de la lecto-escritura donde se vinculen estrategias dela alfabetización emergente.Evidentemente, el aprendizaje de la lectura y la escritura está vinculado con las diferentes dimensiones del desarrollo desde edades tempranas, al respecto Coch menciona que: “No, los bebés no pueden aprender a leer, pero las bases neuronales y conductuales para la lectura posterior se establecen, o no, mucho antes de que comience la instrucción formal en laescuela primaria” (2022). Por lo que consideramos fundamental vincular a las familias con el ámbito escolar y que este aprendizaje se dé en conjunto para potencializar las habilidades, el conocimiento y las actitudes que son precursores del desarrollo de la lectura y la escritura en los estudiantes del preescolar.
A State Transition of the Luminous X-ray Binary in the Low-Metallicity Blue Compact Dwarf Galaxy I Zw 18
Creators: name: Kaaret, Philip
name: Feng, Hua
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a measurement of the X-ray spectrum of the luminous X-ray binary in I Zw 18, the blue compact dwarf galaxy with the lowest known metallicity. We find the highest flux yet observed, corresponding to an intrinsic luminosity near 1E40 erg/s establishing it as an ultraluminous X-ray source (ULX). The energy spectrum is dominated by disk emission with a weak or absent Compton component and there is no significant timing noise; both are indicative of the thermal state of stellar-mass black hole X-ray binaries and inconsistent with the Compton-dominated state typical of most ULX spectra. A previous measurement of the X-ray spectrum shows a harder spectrum that is well described by a powerlaw. Thus, the binary appears to exhibit spectral states similar to those observed from stellar-mass black hole binaries. If the hard state occurs in the range of luminosities found for the hard state in stellar-mass black hole binaries, then the black hole mass must be at least 85 solar masses. Spectral fitting of the thermal state shows that disk luminosities for which thin disk models are expected to be valid are produced only for relatively high disk inclinations, >= 60 degrees, and rapid black hole spins. We find a_* > 0.98 and M > 154 solar masses for a disk inclination of 60 degrees. Higher inclinations produce higher masses and somewhat lower spins.
description: 5 pages, to appear in ApJ, references revised
CO Cameron band and CO2+ UV doublet emissions in the dayglow of Venus: Role of CO in the Cameron band production
Creators: name: Bhardwaj, Anil
name: Jain, Sonal Kumar
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Present study deals with the model calculations of CO Cameron band and CO2+ ultraviolet doublet emissions in the dayglow of Venus. The overhead and limb intensities of CO Cameron band and CO2+ UV doublet emissions are calculated for low, moderate, and high solar activity conditions. Using updated cross sections, the impact of dierent e-CO cross section for Cameron band production is estimated. The electron impact on CO is the major source mechanism of Cameron band, followed by electron and photon impact dissociation of CO2. The overhead intensities of CO Cameron band and CO2+ UV doublet emissions are about a factor of 2 higher in solar maximum than those in solar minimum condition. The effect of solar EUV flux models on the emission intensity is ~30-40% in solar minimum condition and ~2-10% in solar maximum condition. At the altitude of emission peak (135 km), the model predicted limb intensity of CO Cameron band and CO2+ UV doublet emissions in moderate (F10.7 = 130) solar activity condition is about 2400 and 300 kR, respectively, which is in agreement with the very recently published SPICAV/Venus Express observation. The model limb intensity profiles of CO Cameron band and CO2+ UV doublet are compared with SPICAV observation. We also calculated intensities of N2 Vegard-Kaplan UV bands and OI 2972 Å emissions during moderate and high solar activity conditions.
description: 12 pages, 10 figures. In Journal of Geophysical Research, 2013
Numerical Simulations of Solar Chromospheric Jets Associated with Emerging Flux
Creators: name: Takasao, Shinsuke
name: Isobe, Hiroaki
name: Shibata, Kazunari
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We studied the acceleration mechanisms of chromospheric jets associated with emerging flux using a two dimensional magnetohydrodynamic (MHD) simulation. We found that slow mode shock waves generated by magnetic reconnection in the chromosphere and the photosphere play key roles in the acceleration mechanisms of chromospheric jets. An important parameter is the height of magnetic reconnection. When magnetic reconnection takes place near the photosphere, the reconnection out- flow collides with the region where the plasma beta is much larger than unity. Then the plasma moves along a magnetic field. This motion generates a slow mode wave. The slow mode wave develops to a strong slow shock as it propagates upward. When the slow shock crosses the transition region, the transition region is lifted up. As a result, we obtain a chromospheric jet as the lifted transition region. When magnetic reconnection takes place in the upper chromosphere, the chromospheric plasma is accelerated due to the combination of the Lorentz force and the whip-like motion of magnetic field. We found that the chromospheric plasma is further accelerated through the interaction between the transition region (steep density gradient) and a slow shock emanating from the reconnection point. This is an MHD effect which has not been discussed before.
description: PASJ, accepted, 39 pages, 23 figures
Derrida dan Seni Ke(tidak)sepahaman
Creators: name: Dhoni Zustiyantoro
Publisher: name: Zenodo
Year: 2021
Subjects: Filsafat bahasa

description: Jacques Derrida lahir pada 15 Juli 1930 di Kota El-Bira dekat Aljir di negara Aljazair yang waktu itu dijajah Prancis. Tahun 1952, Derrida masuk Ecole Normale Superieure, sekolah bergengsi yang telah meluluskan banyak filsuf Prancis. Di sana ia berkenalan dengan dosen-dosen terkenal, seperti Louis Althusser, Michel Foucault, dan Pierre Bourdieu. Antara 1953-1954, Derrida mempelajari arsip-arsip Husserl di Universitas Leuven, Belgia, yang kemudian menjadi landasannya dalam menulis disertasi, Le Probleme de la genese dans la philosophie de Husserl (Masalah Asal-usul dalam Filsafat Husserl, 1954). Sesudah itu, Derrida mengajar di Universitas Paris I Sorbonne-Pantheon, pada 1960-1964 (Hardiman, 2015). Derrida sempat dinominasikan untuk menggantikan kedudukan Ricoeur di Universitas Nanterre, namun menteri pendidikan Prancis saat itu, Alice Saunier-Seite, menolaknya. Sebuah penolakan yang menghasilkan kepahitan di hati Derrida hingga akhir hayatnya (Mikics, 2009). Karya Derrida yang termasyhur adalah La Voix et le phenomene (Tuturan dan Fenomena, 1967), De le grammatologie (Tentang Gramatologi, 1967), L’Ecriture et la difference (Tulisan dan Perbedaan, 1967), La Dissemination (Pertebaran, 1972), Marges de la philosophie (Pinggiran-pinggiran Filsafat, 1972), Positions (Pendirian-pendirian, 1972), Glas (Glas, 1974), dan puluhan judul lain.
Impurity-induced frustration: low-energy model of diluted oxides
Creators: name: Liu, Shiu
name: Chernyshev, A. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We provide a detailed derivation of the low-energy model for Zn-diluted La2CuO4 in the limit of low doping together with a study of the ground-state properties of that model. We consider Zn-doped La2CuO4 within a framework of the three-band Hubbard model, which closely describes high-Tc cuprates on the energy scale of the most relevant atomic orbitals. Qualitatively, we find that the hybridization of zinc and oxygen orbitals can result in an impurity state with the energy \varepsilon, which is lower than the effective Hubbard gap U. The low-energy, spin-only Hamiltonian includes terms of the order t^2/U and t^4/\varepsilon^3. That is, besides the usual nearest-neighbor superexchange J-terms of order t^2/U, the low-energy model contains impurity-mediated, further-neighbor frustrating interactions among the Cu spins surrounding Zn-sites in an otherwise unfrustrated antiferromagnetic background. These terms can be substantial when \varepsilon ~ U/2, the latter value corresponding to the realistic CuO2 parameters. In order to verify this spin-only model, we subsequently apply the T-matrix approach to study the effect of impurities on the antiferromagnetic order parameter. Previous theoretical studies, which include only the dilution effect of impurities, show a large discrepancy with experimental data in the doping dependence of the staggered magnetization at low doping. We demonstrate that this discrepancy is eliminated by including impurity-induced frustrations into the effective spin model with realistic CuO2 parameters. Recent experimental study shows a significantly stronger suppression of spin stiffness in the case of Zn-doped La2CuO4 compared to the Mg-doped case and thus gives a strong support to our theory. We argue that the proposed impurity-induced frustrations should be important in other strongly correlated oxides and charge-transfer insulators.
description: 16 pages, 12 figures, related work: arXiv:0812.1023, a few clarifications added, published version
Continuity of Extremal Elements in Uniformly Convex Spaces
Creators: name: Ferguson, Timothy
Publisher: name: arXiv
Year: 2013
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30H10, 30H20, 46B10, 46E15

description: In this paper, we study the problem of finding the extremal element for a linear functional over a uniformly convex Banach space. We show that a unique extremal element exists and depends continuously on the linear functional, and vice versa. Using this, we simplify and clarify Ryabykh's proof that for any linear functional on a uniformly convex Bergman space with kernel in a certain Hardy space, the extremal functional belongs to the corresponding Hardy space.
description: 9 pages. Very minor changes from published version