cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
UPLIFT - Sustainable plastics for food and drink packaging
Creators: name: Barranca, Alberto
Publisher: name: Zenodo
Year: 2024

description: The overall idea of UPLIFT is to biologically depolymerize bio- and fossil-based plastic packaging waste and convert it into more renewable and easily upcyclable polymers, following a biorefinery approach. UPLIFT will address the full plastic packaging value chain, from monomer production to packaging material manufacturing and back to EoL reusing and recycling options.
Properties of 187Ta revealed through isomeric decay
Creators: name: Walker, P. M.
name: Hirayama, Y.
name: Lane, G. J.
name: Watanabe, H.
name: Dracoulis, G. D.
name: Ahmed, M.
name: Brunet, M.
name: Hashimoto, T.
name: Ishizawa, S.
name: Kondev, F. G.
name: Litvinov, Yu. A.
name: Miyatake, H.
name: Moon, J. Y.
name: Mukai, M.
name: Niwase, T.
name: Park, J. H.
name: Podolyak, Zs.
name: Rosenbusch, M.
name: Schury, P.
name: Wada, M.
name: Watanabe, X. Y.
name: Liang, W. Y.
name: Xu, F. R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Mass-separated 187Ta in a high-spin isomeric state has been produced for the first time by multi-nucleon transfer reactions, employing an argon gas stopping cell and laser ionisation. Internal gamma rays revealed a 7.3 s isomer at 1778 keV, which decays through a rotational band with perturbations associated with the approach to a prolate-oblate shape transition. Model calculations show less influence from triaxiality compared to heavier elements in the same mass region. The isomer decay reduced E2 hindrance factor of 27 supports the interpretation that axial symmetry is approximately conserved.
description: 5 pages, 5 figures
Equilibrium states of Burgers and KdV equations
Creators: name: Verma, Mahendra K.
name: Chatterjee, Soumyadeep
name: Sharma, Aryan
name: Mohapatra, Ananya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We simulate KdV and dissipation-less Burgers equations using delta-correlated random noise as initial condition. We observe that the energy fluxes of the two equations remain zero throughout, thus indicating their equilibrium nature. We characterize the equilibrium states using Gaussian probability distribution for the real space field, and using Boltzmann distribution for the modal energy. We show that the single soliton of the KdV equation too exhibits zero energy flux, hence it is in equilibrium. We argue that the energy flux is a good measure for ascertaining whether a system is in equilibrium or not.
Extended Curvaton reheating in inflationary models
Creators: name: Campuzano, Cuauhtemoc
name: del Campo, Sergio
name: Herrera, Ramon
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The curvaton reheating in a non-oscillatory inflationary universe model is studied in a Jordan-Brans-Dicke theory. For different scenarios, the temperature of reheating is computed. The result tells us that the reheating temperature becomes practically independent of the Jordan-Brans-Dicke parameter $w$. This reheating temperature results to be quite different when compared with that obtained from Einstein`s theory of gravity.
description: Accepted by JCAP, 12 pages, 1 Figure
Order Parameters and Phase Diagram of Multiferroic RMn$_2$O$_5$
Creators: name: Harris, A. B.
name: Aharony, Amnon
name: Entin-Wohlman, Ora
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The generic magnetic phase diagram of multiferroic RMn$_2$O$_5$ (with R=Y, Ho, Tb, Er, Tm), which allows different sequences of ordered magnetic structures for different R's and different control parameters, is described using order parameters which explicitly incorporate the magnetic symmetry. A phenomenological magneto-electric coupling is used to explain why some of these magnetic phases are also ferroelectric. Several new experiments, which can test this theory, are proposed.
White dwarf-neutron star binary progenitors for ultra-compact X-ray binaries
Creators: name: Bobrick, Alexey
Publisher: name: Zenodo
Year: 2019
Subjects: mass transfer
hydrodynamics
binaries
white dwarfs
neutron stars
simulations
X-ray binaries
eccentricity

description: White dwarf-neutron star binaries are among the main progenitors for ultra-compact X-ray binaries. They spiral in to contact by emitting gravitational waves and depending on the mass of the white dwarf turn into stably transferring ultra-compact X-ray binaries or produce supernova-like events following a tidal disruption of the white dwarf. Nearly all the stably transferring systems evolve through a phase during which mass transfer rates exceed the Eddington rate by orders of magnitude. The standard prescription for population synthesis codes assumes that during this phase all the excess material is lost from the system through a tightly collimated jet originating at the accretor. This is in contrast to observations of systems accreting at highly super-Eddington rates, such as SS 433, which are characterised by significant outflows from the accretion disc. To assess the role of such disc outflows, we perform hydrodynamic simulations of super-Eddington accretion in white dwarf-neutron star binaries. We measure the specific angular momentum lost through disc winds in our simulations and find that it is significantly larger than the angular momentum carried away through a jet. We use the measured angular momentum to construct a model of the long-term evolution of white dwarf-neutron star binaries and predict the outcomes of mass transfer. We find that more binaries result in unstable mass transfer than previously thought. In particular, all the binaries with CO white dwarfs and He white dwarfs more massive than about 0.2 solar masses, which were assumed to be stable, were found to be unstable. This result leads to a better agreement between the empirical inspiral rates of binary pulsars containing white dwarfs and empirical formation rates and compositions of ultra-compact X-ray binaries in the Galaxy.
The dressing procedure for the cosmological equations and the indefinite future of the universe
Creators: name: Yurov, A. V.
name: Astashenok, V. A.
name: Yurov, V. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper we present a new simple method of construction of infinite number of solutions of Freidmann equations from the already known ones, which allows for a startling conclusion of practical impossibility of correct predictions on the universe's future dynamics which are based solely on astronomical observations on the value of a scale factor. In addition, we present particular examples of newly constructed solutions, such as the ones, describing the smooth dynamical (de)-phantomization, and the models lacking the events horizons (both in classical and brane world cases). The generalization of the method to the simplest anisotropic universes are presented as well.
description: New version: 8 pages, RevTeX; the old title ''The dressing procedure for the Friedmann equations and the indefinite future of the universe''; the results about anisotropic cosmological models and references are added
On Variational Micro-Macro Models and their Application to Polycrystals
Creators: name: Arminjon, Mayeul
name: Imbault, Didier
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Some variational micro-macro models are briefly reviewed: it is shown how, starting from the Taylor model and passing through the relaxed Taylor model, a consistent intermediate between Taylor's upper bound and the lower bound (Sachs or rather "static") model was obtained. This intermediate or "inhomogeneous" variational model (indeed, it generally predicts both strain and stress to be inhomogeneous) could offer a general alternative to self-consistent models. However, the implemented version was a rather empirical model (ARMINJON [1984]) with a less well-defined status. We present current progress in the implementation of the correct version.
From the Fermi blazar sequence to the relation between Fermi blazars and gamma-ray Narrow-line Seyfert 1 Galaxies
Creators: name: Chen, Yongyun
name: Gu, Qiusheng
name: Fan, Junhui
name: Wang, Hongtao
name: Ding, Nan
name: Yu, Xiaolin
name: Guo, Xiaotong
name: Xiong, Dingrong
name: Qin, Shaojie
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use the third catalog of blazars detected by Fermi/LAT (3LAC) and gamma-ray Narrow-line Seyfert 1 Galaxies (gamma-NLSy1s) to study the blazar sequence and relationship between them. Our results are as follows: (i) There is a weak anti-correlation between synchrotron peak frequency and peak luminosity for both Fermi blazars and gamma-NLSy1s, which supports the blazar sequence. However, after Doppler correction, the inverse correlation disappeared, which suggests that anti-correlation between synchrotron peak frequency and peak luminosity is affected by the beaming effect. (ii) There is a significant anti-correlation between jet kinetic power and synchrotron peak frequency for both Fermi blazars and gamma-NLSy1s, which suggests that the gamma-NLSy1s could fit well into the original blazar sequence. (iii) According to previous work, the relationship between synchrotron peak frequency and synchrotron curvature can be explained by statistical or stochastic acceleration mechanisms. There are significant correlations between synchrotron peak frequency and synchrotron curvature for whole sample, Fermi blazars and BL Lacs, respectively. The slopes of the correlation are consistent with statistical acceleration. For FSRQs, LBLs, IBLs, HBLs, and gamma-NLS1s, we also find a significant correlation, but in these cases the slopes can not be explained by previous theoretical models. (iv) The slope of relation between synchrotron peak frequency and synchrotron curvature in gamma-NLS1s is large than that of FSRQs and BL Lacs. This result may imply that the cooling dominates over the acceleration process for FSRQs and BL Lacs, while gamma-NLS1s is the opposite.
description: 10 pages, 5 figures, 3 tables, Accepted for publication in ApJ
Fusion Rules of the Lowest Weight Representations of osp_q(1|2) at Roots of Unity: Polynomial Realization and Degeneration at Roots of Unity
Creators: name: Karakhanyan, D.
name: Khachatryan, Sh.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The degeneracy of the lowest weight representations of the quantum superalgebra $osp_q(1|2)$ and their tensor products at exceptional values of %when deformation parameter $q$ takes exceptional values is studied. The main features of the structures of the finite dimensional lowest weight representations and their fusion rules are illustrated using realization of group generators as finite-difference operators acting in the space of the polynomials. The complete fusion rules for the decompositions of the tensor products at roots of unity are presented. The appearance of indecomposable representations in the fusions is described using Clebsh-Gordan coefficients derived for general values of $q$ and at roots of unity.
description: 28 pages, 3 figures; completed (section 5, section 6); version published in JPA
TRANSFORMING ARTIFICIAL INTELLIGENCE FOR FUTURE GENERATIONS
Creators: name: S. Menaka
Publisher: name: Zenodo
Year: 2025

description: Artificial Intelligence (AI) is poised to significantly influence future generations, particularly in shaping their societal interactions, educational experiences, and ethical considerations. As AI technologies become more integrated into daily life, understanding their implications is crucial for fostering a responsible and adaptive society. Generation Z, the first to grow up with AI, expresses concerns about privacy, data security, and algorithmic bias, emphasizing the need for transparency in AI systems. There is a growing awareness of job displacement due to automation, prompting calls for reskilling and educational reforms to prepare for an AI-driven job market. AI is seen as a transformative force in education, enabling personalized learning experiences that cater to individual student needs. Younger generations advocate for educational frameworks that incorporate AI literacy, ensuring they are equipped to navigate an AI-centric world. Future generations must navigate these challenges to harness AI's full potential responsibly.
Fractional Spin Hall Effect in Atomic Bose Gases
Creators: name: Liu, Xiong-Jun
name: Liu, Xin
name: Kwek, L. C.
name: Oh, C. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose fractional spin hall effect (FSHE) by coupling pseudospin states of cold bosonic atoms to optical fields. The present scheme is an extension to interacting bosonic system of the recent work \cite{liu,zhu} on optically induced spin hall effect in non-interacting atomic system. The system has two different types of ground states. The 1st type of ground state is a 1/3-factor Laughlin function, and has the property of chiral - anti-chiral interchange antisymmetry, while the 2nd type is shown to be a 1/4-factor wave function with chiral - anti-chiral symmetry. The fractional statistics corresponding to the fractional spin Hall states are studied in detail, and are discovered to be different from that corresponding to the fractional quantum Hall (FQH) states. Therefore the present FSHE can be distinguished from FQH regime in the measurement.
description: 8 pages, 2 figures, to appear in Phys. Rev. B
Ο Αυτοκαθορισμός στα παιδιά με ήπια και μέτρια νοητική ανεπάρκεια: οι απόψεις των παιδιών και των γονέων
Creators: name: Βουτσά, Ειρήνη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Νοητική ανεπάρκεια
Αυτοκαθορισμός
Mental retardation
Self-determination

description: Στόχος της παρούσας μεταπτυχιακής διπλωματικής εργασίας είναι να διερευνήσουμε την ελληνική εκδοχή των αποτελεσμάτων στα ζητήματα αυτοκαθορισμού στα άτομα με νοητική ανεπάρκεια, να εξετάσουμε το βαθμό αυτοκαθορισμού στα παιδιά με νοητική ανεπάρκεια αλλά και τις απόψεις των γονέων των παιδιών με νοητική ανεπάρκεια αναφορικά με το πόσο αυτοκαθορισμένα θεωρούν ότι είναι τα παιδιά τους, βασιζόμενοι στην αμερικάνικη κλίμακα αυτοκαθορισμού της Arc.
description: The objective of this dissertation is to explore the Greek version of the results to the issues of self-determination for people with mental retardation, to examine the degree of self-determination in children with mental retardation and the views of their parents in relation to how seld-determined think their children are, based on the American Arc's self-determination scale.
Strain energy function for isotropic non-linear elastic incompressible solids with linear finite strain response in shear and torsion
Creators: name: Mangan, Robert
name: Destrade, Michel
name: Saccomandi, Giuseppe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We find the strain energy function for isotropic incompressible solids exhibiting a linear relationship between shear stress and amount of shear, and between torque and amount of twist, when subject to large simple shear or torsion deformations. It is inclusive of the well-known neo-Hookean and the Mooney-Rivlin models, but also can accommodate other terms, as certain arbitrary functions of the principal strain invariants. Effectively, the extra terms can be used to account for several non-linear effects observed experimentally but not captured by the neo-Hookean and Mooney-Rivlin models, such as strain stiffening effects due to limiting chain extensibility.
Einstein-Podolsky-Rosen entanglement and asymmetric steering between distant macroscopic mechanical and magnonic systems
Creators: name: Tan, Huatang
name: Li, Jie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a deterministic scheme for establishing hybrid Einstein-Podolsky-Rosen (EPR) entanglement channel between a macroscopic mechanical oscillator and a magnon mode in a distant yttrium-iron-garnet (YIG) sphere across about ten gigahertz of frequency difference. The system consists of a driven electromechanical cavity which is unidirectionally coupled to a distant electromagnonical cavity inside which a YIG sphere is placed. We find that far beyond the sideband-resolved regime in the electromechanical subsystem, stationary phonon-magnon EPR entanglement can be achieved. This is realized by utilizing the output field of the electromechanical cavity being an intermediary which distributes the electromechanical entanglement to the magnons, thus establishing a remote phonon-magnon entanglement. The EPR entanglement is strong enough such that phonon-magnon quantum steering can be attainable in an asymmetric manner. This long-distance macroscopic hybrid EPR entanglement and steering enable potential applications not only in fundamental tests of quantum mechanics at the macro scale, but also in quantum networking and one-sided device-independent quantum cryptography based on magnonics and electromechanics.
Dynamical control of electron spin coherence in a quantum dot
Creators: name: Zhang, Wenxian
name: Dobrovitski, V. V.
name: Santos, Lea F.
name: Viola, Lorenza
name: Harmon, B. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the performance of dynamical decoupling methods at suppressing electron spin decoherence from a low-temperature nuclear spin reservoir in a quantum dot. The controlled dynamics is studied through exact numerical simulation, with emphasis on realistic pulse delays and long-time limit. Our results show that optimal performance for this system is attained by a periodic protocol exploiting concatenated design, with control rates substantially slower than expected from the upper spectral cutoff of the bath. For a known initial electron spin state, coherence can saturate at long times, signaling the creation of a stable ``spin-locked'' decoherence-free subspace. Analytical insight on saturation is obtained for a simple echo protocol, in good agreement with numerical results.
description: 4 pages, 4 figures with 3 of them in color
Purely infinite C*-algebras of real rank zero
Creators: name: Pasnicu, Cornel
name: Rordam, Mikael
Publisher: name: arXiv
Year: 2006
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L35, 46L05, 46L80

description: We show that a separable purely infinite C*-algebra is of real rank zero if and only if its primitive ideal space has a basis consisting of compact-open sets and the natural map K_0(I) -> K_0(I/J) is surjective for all closed two-sided ideals J contained in I in the C*-algebra. It follows in particular that if A is any separable C*-algebra, then A tensor O_2 is of real rank zero if and only if the primitive ideal space of A has a basis of compact-open sets, which again happens if and only if A tensor O_2 has the ideal property, also known as property (IP).
description: 24 pages. Revised version. Two earlier versions were mixtures of old and new versions, and even worse, the bibliography was missing in version 2!
Electronic structure of noble metal impurities in semiconductors: Cu in GaP
Creators: name: Farberovich, O. V.
name: Yaresko, A.
name: Kikoin, K.
name: Fleurov, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A numerical method for calculation of the electronic structure of transition metal impurities in semiconductors based on the Green function technique is developed. The electronic structure of 3d impurity is calculated within the LDA+U version of density functional method, whereas the host electron Green function is calculated by using the linearized augmented plane wave expansion. The method is applied to the Cu impurity in GaP. The results of calculations are compared with those obtained within the supercell LDA procedure. It is shown that in the Green function approach Cu impurity has an unfilled 3d shell. This result paves a way to explanation of the magnetic order in dilute Ga_{1-x}Cu_xP alloys.
description: 6 figures
Magnetic and transport properties of a one dimensional frustrated t-J model for vanadate nanotubes
Creators: name: Costamagna, S.
name: Riera, J. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose a one-dimensional model consisting of a chain with a t-J Hamiltonian coupled to a Heisenberg chain in a frustrated geometry to describe the appearance of the ferromagnetic phase which has been experimentally observed in vanadate nanotubes. This model contains a mechanism of frustration suppressed by doping suggested by L. Krusin-Elbaum, et al. [Nature 431, 672 (2004)]. We study, using numerical techniques in small clusters, the relation between magnetic order and transport properties in the proposed model, and we perform a detailed comparison of the physical properties of this model with those of the ferromagnetic Kondo lattice model. For this comparison, a number of results for the latter model, obtained using the same numerical techniques, will be provided to complement those results already available in the literature. We conclude that it does not appear to be a true ferromagnetic order in the proposed model, but rather an incommensurate ferrimagnetic one, and contrary to what happens in the ferromagnetic Kondo lattice model, electronic transport is somewhat suppressed by this ferrimagnetic order.
description: 9 pages, 10 eps figures; final version to appear in Physical Review B
Scattering quantum random-walk search with errors
Creators: name: Gabris, A.
name: Kiss, T.
name: Jex, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the realization of a quantum-walk search algorithm in a passive, linear optical network. The specific model enables us to consider the effect of realistic sources of noise and losses on the search efficiency. Photon loss uniform in all directions is shown to lead to the rescaling of search time. Deviation from directional uniformity leads to the enhancement of the search efficiency compared to uniform loss with the same average. In certain cases even increasing loss in some of the directions can improve search efficiency. We show that while we approach the classical limit of the general search algorithm by introducing random phase fluctuations, its utility for searching is lost. Using numerical methods, we found that for static phase errors the averaged search efficiency displays a damped oscillatory behaviour that asymptotically tends to a non-zero value.
description: 10 pages, 10 figures. Two figures added for clarity, also made improvements to the text
Thermoelectric power factor under strain-induced band-alignment in the half-Heuslers NbCoSn and TiCoSb
Creators: name: Kumarasinghe, Chathurangi
name: Neophytou, Neophytos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Band convergence is an effective strategy to improve the thermoelectric performance of complex bandstructure thermoelectric materials. Half-Heuslers are good candidates for band convergence studies because they have multiple bands near the valence bad edge that can be converged through various band engineering approaches providing power factor improvement opportunities. Theoretical calculations to identify the outcome of band convergence employ various approximations for the carrier scattering relaxation times (the most common being the constant relaxation time approximation) due to the high computational complexity involved in extracting them accurately. Here, we compare the outcome of strain-induced band convergence under two such scattering scenarios: i) the most commonly used constant relaxation time approximation and ii) energy dependent inter- and intra-valley scattering considerations for the half-Heuslers NbCoSn and TiCoSb. We show that the outcome of band convergence on the power factor depends on the carrier scattering assumptions, as well as the temperature. For both materials examined, band convergence improves the power factor. For NbCoSn, however, band convergence becomes more beneficial as temperature increases, under both scattering relaxation time assumptions. In the case of TiCoSb, on the other hand, constant relaxation time considerations also indicate that the relative power factor improvement increases with temperature, but under the energy dependent scattering time considerations, the relative improvement weakens with temperature. This indicates that the scattering details need to be accurately considered in band convergence studies to predict more accurate trends.
description: 21 pages, 8 figures. arXiv admin note: text overlap with arXiv:1905.07951
Working the network : initiating a new science and technology course
Creators: name: Hepburn, Gary Roy
Publisher: name: University of British Columbia
Year: 2009

description: This study explores the introduction of a new applied physics course into a British Columbia high school during the 1994-1995 school year. The course was part of a provincial effort aimed at making science and technology education more responsive to the workplace. Data collection took place during the first year the applied physics course was being piloted at the school and focused on the pilot teacher and the applied physics classes, but also involved others inside and outside the school who had a connection to the course. A variety of methods were used in data collection including interviews, observation, and document analysis. Using actor-network theory and sociocultural theory, the focus of the research is on the networks that were constructed at the pilot school and at the provincial level where the course was conceptualized and developed. The research describes how the teacher and other network builders attempted to enroll various human and nonhuman actors into the networks they were constructing in support of the course. They did this by convincing the actors that the course was compatible with their interests. The types of actors that were enrolled, the sociocultural communities they belonged to, and what it took to convince them to support the course are shown to shape the way that the course was enacted in the classroom. In addition, it is demonstrated that the network that was constructed at the provincial level had only a minor connection to the one the teacher was constructing at the school level. The lack of contact between the two networks meant that the interests of those who were involved in organizing the applied physics pilots at the provincial level were seldom taken into account in the course at the school. Fourteen conclusions are drawn about the networks that were constructed and the network building process at both the school and provincial levels. These conclusions have implications for policy in educational change initiatives and for addressing problems that emerge when cross-subject courses are introduced. The research also develops a new theoretical approach that will contribute to advancing research on educational change.
Thermodynamics of Near BPS Black Holes in AdS$_4$ and AdS$_7$
Creators: name: Larsen, Finn
name: Paranjape, and Shruti
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We develop the thermodynamics of black holes in AdS$_4$ and AdS$_7$ near their BPS limit. In each setting we study the two distinct deformations orthogonal to the BPS surface as well as their nontrivial interplay with each other and with BPS properties. Our results illuminate recent microscopic calculations of the BPS entropy. We show that these microscopic computations can be leveraged to also describe the near BPS regime, by generalizing the boundary conditions imposed on states.
description: 45 pages, 1 figure
The determinant of q-distance matrices of trees and two quantities relating to permutations
Creators: name: Yan, Weigen
name: Yeh, Yeong-Nan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 15A09; 15A15

description: In this paper we prove that two quantities relating to the length of permutations defined on trees are independent of the structures of trees. We also find that these results are closely related to the results obtained by Graham and Pollak (Bell System Tech. J. 50(1971) 2495--2519) and by Bapat, Kirkland, and Neumann (Linear Alg. Appl. 401(2005) 193--209).
description: 12 pages, 1 figure
Complete positivity for time-dependent qubit master equations
Creators: name: Hall, Michael J. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is shown that if the decoherence matrix corresponding to a qubit master equation has a block-diagonal real part, then the evolution is determined by a one-dimensional oscillator equation. Further, when the full decoherence matrix is block-diagonal, then the necessary and sufficient conditions for completely positive evolution may be formulated in terms of the oscillator Hamiltonian or Lagrangian. When the solution of the oscillator equation is not known, an explicit sufficient condition for complete positivity can still be obtained, based on a Hamiltonian/Lagrangian inequality. A rotational form-invariance property is used to characterise the evolution via a single first-order nonlinear differential equation, enabling some further exact results to be obtained. A class of master equations is identified for which complete positivity reduces to the simpler condition of positivity.
description: Additional example and ref; to appear in J. Phys. A
Mining the curriculum: comparing the form and content of the museum exhibit Mine games with other mining curricula
Creators: name: Korteweg, Elisabeth (Lisa) Maria
Publisher: name: University of British Columbia
Year: 2009

description: In 1993, facing a future of escalating land-use controversies and a less than sympathetic public attitude towards mining, major corporations in the British Columbia mining industry and the provincial government invested in a public education project: Vancouver's Science World's Mine Games exhibit. This thesis will examine two pedagogical highlights of the Mine Games exhibit promoted by Science World and its sponsors. They are the interactivity of the exhibit (as evidenced by the hands-on stations and the computer games) and the decision-making or 'consensus-building' process experienced in the simulated town-meeting, Hotseat! One of the virtues of an exhibition that explicitly makes a case for its merits and attempts to tell an important story is that it encourages debate and makes possible the suggestion of other stories. In this thesis, I critique Mine Games on the claims it has made for itself. The thesis adopts a comparative approach, contrasting the pedagogical goals and content of the Mine Games exhibit with school based mining curriculum. I argue that the narrative and museological conventions of the exhibit reveal the story of Mine Games for what it is — a specific, comedic story that excludes other stories. Hidden under the facade of high-tech displays and computer games is a traditional approach used both in schools and museums to exercise control and deliver a non-threatening message: environmental controversies are resolvable, all it takes is reasoned compromise.
Η σχέση μεταξύ των γλωσσικών και κοινωνικών χαρακτηριστικών σε παιδιά με διαταραχές λόγου και ήπια νοητική καθυστέρηση στην προσχολική ηλικία:
Creators: name: Μακρίδου, Μαριάνθη Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Χαρακτηριστικά
Διαταραχές Λόγου
Ήπια νοητική καθυστέρηση
Characteristics
Specific language impairment
Mild Developmental Delays

description: Σκοπός της παρούσας εργασίας ήταν να εξετάσει αν τα παιδιά με διαταραχές λόγου και ήπια νοητική καθυστέρηση διαφέρουν ως προς της γλωσσικές και κοινωνικές τους ικανότητες. Πιο συγκεκριμένα η έρευνα προσπάθησε να εξετάσει αν τα παιδιά με διαταραχές λόγου και τα παιδιά με ήπια νοητική καθυστέρηση αποτελούν δυο ξεχωριστές ομάδες με βάση τα γλωσσικά και κοινωνικά τους χαρακτηριστικά και επομένως έχουν ανάγκη από διαφορετικά προγράμματα παρέμβασης ή αν αποτελούν μια ομάδα με κοινά γλωσσικά και κοινωνικά χαρακτηριστικά και επομένως απαιτούν ένα ενιαίο πρόγραμμα παρέμβασης. Παρουσιάσαμε τα χαρακτηριστικά του λόγου και της σχέσης της κοινωνικής και γλωσσικής ανάπτυξης καθώς και τα γλωσσικά, γνωστικά και κοινωνικά χαρακτηριστικά των παιδιών τυπικής ανάπτυξης, με διαταραχές λόγου και ήπια νοητική καθυστέρηση στην προσχολική ηλικία. Στη συνέχεια αξιολογήσαμε τις τρεις ομάδες ως προς τη μαθησιακή (με το μαθησιακό κριτήριο Dtla-3) και τη γλωσσική τους επάρκεια (με το γλωσσικό κριτήριο Λ-α-τ-ω) καθώς και τις κοινωνικές τους δεξιότητες (με το ερωτηματολόγιο κοινωνικών δεξιοτήτων). Παρουσιάσαμε αναλυτικά τις διαφορετικές επιδόσεις των παιδιών στα κριτήρια καθώς και τις συσχετίσεις μεταξύ των γλωσσικών και μαθησιακών χαρακτηριστικών με τις κοινωνικές τους δεξιότητες. Τα αποτελέσματα της έρευνας υποστηρίζουν την άποψη της ύπαρξης δυο ομάδων παιδιών σε επικυνδυνότητα βάση των γλωσσικών και κοινωνικών τους χαρακτηριστικών.
description: The aim of the present study was to examine whether children with specific language impairment and mild developmental delays differ in language and social skills. Specifically this research sought to examine if they comprise two distinct groups on the basis of their language and social competence characteristics and therefore they are in need of different educational treatment or whether they comprise a homogenous group in language and social competence, which requires the same early intervention program. We presented the characteristics of speech and the relationship between social and language development as well as the language, cognitive and social characteristics of children typically developed, with specific language impairment and mild developmental delays in preschool years. Then we evaluated the three groups in terms of learning (with Dtla-3 Test of Learning Aptitude) and language (with Λ-α-Τ-ω Language Competence Test) efficiency as well as in social skills (with the social skills questionnaire). We presented thoroughly children different performance in the criteria and the relationship between language and learning characteristics and their social skills. The findings of this research support the approach of the two distinct groups of high-risk preschoolers in terms of their language and social characteristics.
Quantitative measurement of the thermal contact resistance between a glass microsphere and a plate
Creators: name: Doumouro, Joris
name: Perros, Elodie
name: Dodu, Alix
name: Rahbany, Nancy
name: Leprat, Dominique
name: Krachmalnicoff, Valentina
name: Carminati, Rémi
name: Poirier, Wilfrid
name: De Wilde, Yannick
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Accurate measurements of the thermal resistance between micro-objects made of insulating materials are complex because of their small size, low conductivity, and the presence of various ill-defined gaps. We address this issue using a modified scanning thermal microscope operating in vacuum and in air. The sphere-plate geometry is considered. Under controlled heating power, we measure the temperature on top of a glass microsphere glued to the probe as it approaches a glass plate at room temperature with nanometer accuracy. In vacuum, a jump is observed at contact. From this jump in temperature and the modeling of the thermal resistance of a sphere, the sphere-plate contact resistance $ R_K=(1.4 \pm 0.18)\times10^7 \ \mathrm{K.W^{-1}}$ and effective radius $r=(36 \pm 4)$ nm are obtained. In air, the temperature on top of the sphere shows a decrease starting from a sphere-plate distance of 200 $\mathrm{μm}$. A jump is also observed at contact, with a reduced amplitude. The sphere-plate coupling out of contact can be described by the resistance shape factor of a sphere in front of a plate in air, placed in a circuit involving a series and a parallel resistance that are determined by fitting the approach curve. The contact resistance in air $R^*_K=(1.2 \pm 0.46)\times 10^7 \ \mathrm{K.W^{-1}}$ is then estimated from the temperature jump. The method is quantitative without requiring any tedious multiple-scale numerical simulation, and is versatile to describe the coupling between micro-objects from large distances to contact in various environments.
description: 8 pages, 4 figures
Bar-Driven Mass Build-Up within the Central 50pc of NGC6946
Creators: name: Schinnerer, E.
name: Boeker, T.
name: Emsellem, E.
name: Downes, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have used the new extended A configuration of the IRAM Plateau de Bure interferometer to study the dense molecular gas in the nucleus of the nearby spiral galaxy NGC6946 at unprecedented spatial resolution in the HCN(1-0) and CO(2-1) lines. The gas distribution in the central 50pc has been resolved and is consistent with a gas ring or spiral driven by the inner 400pc long stellar bar. For the first time, it is possible to directly compare the location of (dense) giant molecular clouds with that of (optically) visible HII regions in space-based images. We use the 3mm continuum and the HCN emission to estimate in the central 50pc the star formation rates in young clusters that are still embedded in their parent clouds and hence are missed in optical and near-IR surveys of star formation. The amount of embedded star formation is about 1.6 times as high as that measured from HII regions alone, and appears roughly evenly split between ongoing dust-obscured star formation and very young giant molecular cloud cores that are just beginning to form stars. The build-up of central mass seems to have continued over the past > 10 Myrs, to have occurred in an extended (albeit small) volume around the nucleus, and to be closely related to the presence of an inner bar.
description: 4 pages, 4 figures, accepted for A&A Letters (PdBI special issue)
Dense cores in the Seahorse infrared dark cloud: physical properties from modified blackbody fits to the far-infrared-submillimetre spectral energy distributions
Creators: name: Miettinen, Oskari
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We used data from WISE, IRAS, and Herschel in conjuction with our previous observations with SABOCA and LABOCA, and constructed the far-IR to submillimetre spectral energy distributions (SEDs) of dense cores in the filamentary Seahorse infrared dark cloud (IRDC) G304.74+01.32. For the 12 analysed cores, which include two IR dark cores (no WISE counterpart), nine IR bright cores, and one HII region, the mean dust temperature of the cold (warm) component, the mass, luminosity, H$_2$ number density, and surface density were derived to be $13.3\pm1.4$ K ($47.0\pm5.0$ K), $113\pm29$ M$_{\odot}$, $192\pm94$ L$_{\odot}$, $(4.3\pm1.2)\times10^5$ cm$^{-3}$, and $0.77\pm0.19$ g cm$^{-3}$, respectively. The HII region IRAS 13039-6108a was found to be the most luminous source in our sample ($(1.1\pm0.4)\times10^3$ L$_{\odot}$). All the cores were found to be gravitationally bound (i.e. the virial parameter $α_{\rm vir}<2$). Seven out of 12 of the analysed cores (58%) were found to lie above the mass-radius thresholds of high-mass star formation proposed in the literature. The surface densities of $Σ>0.4$ g cm$^{-3}$ derived for these seven cores also exceed the corresponding threshold for high-mass star formation. Five of the analysed cores (42%) show evidence of fragmentation into two components in the SABOCA 350 $μ$m image. In addition to the HII region source IRAS 13039-6108a, some of the other cores in Seahorse also appear to be capable of giving birth to high-mass stars. The dense core population in the Seahorse IRDC has comparable average properties to the cores in the well-studied Snake IRDC G11.11-0.12. The Seahorse core fragmentation mechanisms appear to be heterogenous, including cases of both thermal and non-thermal Jeans instability. High-resolution follow-up studies are required to address the fragmented cores' genuine potential of forming high-mass stars.
description: 16 pages (incl. two appendices), 9 figures, 6 tables, accepted for publication in A&A, abstract abridged for arXiv
title: Dagstuhl Reports, Table of Contents, Volume 14, Issue 4, 2024
Creators: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2024
Subjects: subject: Table of Contents
subject: Frontmatter

description: Dagstuhl Reports, Table of Contents, Volume 14, Issue 4, 2024
description: DagRep, Volume 14, Issue 4, pages i-ii
Tracing circumnuclear dense gas in H2O maser galaxies
Creators: name: Farhan, A.
name: Ercan, E. N.
name: Tombesi, F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A sample of 30 H2O extra-galactic maser galaxies with their published HCN(J=1-0) and HCO+(J=1-0) observations has been compiled to investigate the dense gas correlation with H2O maser emission. Our sample number exceeds the size of the previous HCN samples studied so far by a factor of three, and it is the first study on the possible relation with the dense gas tracer HCO+. We find a strong correlation between normalized H2O maser emission luminosity (LH2O\LCO) and normalized HCO+ line luminosity (LHCO+\LCO). Moreover, a weak correlation has been found between LH2O\LCO and normalized HCN line luminosity (LHCN\LCO). The sample is also studied after excluding Luminous and Ultraluminous infrared galaxy (U)LIRG sources, and the mentioned correlations are noticeably stronger. We show that 'Dense gas' fractions as obtained from HCN and HCO+ molecules tightly correlate with maser emission, especially for galaxies with normal IR luminosity(LIR< 10^11Lsun) and we show that HCO+ is a better 'dense gas' tracer than HCN. Further systematic studies of these dense gas tracers with higher transition level lines are vital to probe megamaser physical conditions and to accurately determining how maser emission interrelates with the dense gas.
Unmanned Aerial Vehicle Control Through Domain-based Automatic Speech Recognition
Creators: name: Contreras, Ruben
name: Ayala, Angel
name: Cruz, Francisco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Currently, unmanned aerial vehicles, such as drones, are becoming a part of our lives and reaching out to many areas of society, including the industrialized world. A common alternative to control the movements and actions of the drone is through unwired tactile interfaces, for which different remote control devices can be found. However, control through such devices is not a natural, human-like communication interface, which sometimes is difficult to master for some users. In this work, we present a domain-based speech recognition architecture to effectively control an unmanned aerial vehicle such as a drone. The drone control is performed using a more natural, human-like way to communicate the instructions. Moreover, we implement an algorithm for command interpretation using both Spanish and English languages, as well as to control the movements of the drone in a simulated domestic environment. The conducted experiments involve participants giving voice commands to the drone in both languages in order to compare the effectiveness of each of them, considering the mother tongue of the participants in the experiment. Additionally, different levels of distortion have been applied to the voice commands in order to test the proposed approach when facing noisy input signals. The obtained results show that the unmanned aerial vehicle is capable of interpreting user voice instructions achieving an improvement in speech-to-action recognition for both languages when using phoneme matching in comparison to only using the cloud-based algorithm without domain-based instructions. Using raw audio inputs, the cloud-based approach achieves 74.81% and 97.04% accuracy for English and Spanish instructions respectively, whereas using our phoneme matching approach the results are improved achieving 93.33% and 100.00% accuracy for English and Spanish languages.
description: Submitted to Computers