cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Measurement of the current-phase relation of superconducting atomic contacts
Creators: name: Della Rocca, M. L.
name: Chauvin, M.
name: Huard, B.
name: Pothier, H.
name: Esteve, D.
name: Urbina, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have probed the current-phase relation of an atomic contact placed with a tunnel junction in a small superconducting loop. The measurements are in quantitative agreement with the predictions of a resistively shunted SQUID model in which the Josephson coupling of the contact is calculated using the independently determined transmissions of its conduction channels.
description: to be published in Physical Review Letters
Dynamic Properties of Molecular Motors in Burnt-Bridge Models
Creators: name: Artyomov, Maxim N.
name: Morozov, Alexander Yu.
name: Pronina, Ekaterina
name: Kolomeisky, Anatoly B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Dynamic properties of molecular motors that fuel their motion by actively interacting with underlying molecular tracks are studied theoretically via discrete-state stochastic ``burnt-bridge'' models. The transport of the particles is viewed as an effective diffusion along one-dimensional lattices with periodically distributed weak links. When an unbiased random walker passes the weak link it can be destroyed (``burned'') with probability p, providing a bias in the motion of the molecular motor. A new theoretical approach that allows one to calculate exactly all dynamic properties of motor proteins, such as velocity and dispersion, at general conditions is presented. It is found that dispersion is a decreasing function of the concentration of bridges, while the dependence of dispersion on the burning probability is more complex. Our calculations also show a gap in dispersion for very low concentrations of weak links which indicates a dynamic phase transition between unbiased and biased diffusion regimes. Theoretical findings are supported by Monte Carlo computer simulations.
description: 14 pages. Submitted to J. Stat. Mech
Hardness Test of GRB 950830 as a Gravitationally Lensed Echo
Creators: name: Mukherjee, Oindabi
name: Nemiroff, Robert J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Cumulative hardness comparisons are a simple but statistically powerful test for the presence of gravitational lensing in gamma-ray bursts (GRBs). Since gravitational lensing does not change photon energies, all source images should have the same spectra -- and hence hardness. Applied to the recent claim that the two pulses in GRB 950830 are lensed images of the same pulse, the measured flux ratio between the two main pulses should be the same at all energies. After summing up all the counts in both of GRB 950830's two pulses in all four BATSE energy bands, it was found that in energy channel 3, the second pulse appears somewhat weak. In comparison with the other BATSE energy channels, the difference was statistically significant at above 90\%. This model-independent test indicates that the case for GRB 950830 involving a gravitational lens may be intriguing -- but should not be considered proven.
description: 2 pages, 1 figure
Pantoea agglomerans as a cancer hallmark in immunocompromised patients
Creators: name: Faria, Nuno
name: Inês Costa, Maria
name: Quita, Ricardo
name: Dias, Catarina
name: Gomes, Joana
name: Cruz, Hugo
name: Sucena, Maria
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 320203
subject: Clinical microbiology

description: Pantoea agglomerans as a cancer hallmark in immunocompromised patientsRevista de Patología Respiratoria 24(1)https://hp.dev3.link/descargas/PR_24-1_23-25.pdf
Hopf-Galois module structure of quartic Galois extensions of $\mathbb{Q}$
Creators: name: Gil-Muñoz, Daniel
name: Rio, Anna
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11R33, 16T05

description: Given a quartic Galois extension $L/\mathbb{Q}$ of number fields and a Hopf-Galois structure $H$ on $L/\mathbb{Q}$, we study the freeness of the ring of integers $\mathcal{O}_L$ as module over the associated order $\mathfrak{A}_H$ in $H$. For the classical Galois structure $H_c$, we know by Leopoldt's theorem that $\mathcal{O}_L$ is $\mathfrak{A}_{H_c}$-free. If $L/\mathbb{Q}$ is cyclic, it admits a unique non-classical Hopf-Galois structure, whereas if it is biquadratic, it admits three such Hopf-Galois structures. In both cases, we obtain that freeness depends on the solvability in $\mathbb{Z}$ of certain generalized Pell equations. We shall translate some results on Pell equations into results on the $\mathfrak{A}_H$-freeness of $\mathcal{O}_L$.
Galena lead isotope study of mineral deposits in the Eagle Bay Formation, southeastern British Columbia
Creators: name: Goutier, Françoise Mélanie
Publisher: name: University of British Columbia
Year: 2010

description: The Eagle Bay Formation in the Adams Plateau-Clearwater area, 35km northeast of Kamloops, hosts several economic and sub-economic mineralized occurrences. The age and genesis of these mineral deposits can be estimated by using a specific growth curve which depicts the lead evolution for the Eagle Bay Formation. This curve, named the remodeled curve, represents a local deviation from the average 'shale' curve of Godwin and Sinclair (1982) for the autochthonous part of the Canadian Cordillera. This remodeled curve is specifically applicable to the Adams Plateau-Clearwater area. The lead isotope data from the deposits of the Eagle Bay Formation plot in three distinct clusters along the curve indicating that the lead isotopic signature of the Eagle Bay Formation is upper crustal, and that three periods of mineralization can be recognized or 'fingerprinted'. Accordingly, mineralization cogenetic with Devonian volcanism, and veins related to Cretaceous magmatism can be distinguished by location of galena-lead isotope values within clusters 1 or 3 respectively. Cluster 2 reflects a Late Triassic pulse of mineralization and includes epigenetic veins and stratiform deposits. These deposits are either replacement or cogenetic with their host. The Triassic model age for mineralization that is apparently stratiform and cogenetic raises questions about the currently assigned Cambrian age of associated host rock. To accommodate the lead isotope data a new Upper Triassic unit (T-EBG) within the Eagle Bay Formation is defined. The distinctive lead isotopic signature between deposits hosted by the Eagle Bay Formation is valuable as a guide for future mineral exploration programs in the Adams Plateau-Clearwater area. Recognition of lead isotopic fields that fingerprint types of mineral deposits, provides a useful and practical framework for the classification and evaluation of new mineralized prospects in the area.
Deformation Quantization of Poisson Structures Associated to Lie Algebroids
Creators: name: Neumaier, Nikolai
name: Waldmann, Stefan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53D55; 53D17

description: In the present paper we explicitly construct deformation quantizations of certain Poisson structures on E^*, where E -> M is a Lie algebroid. Although the considered Poisson structures in general are far from being regular or even symplectic, our construction gets along without Kontsevich's formality theorem but is based on a generalized Fedosov construction. As the whole construction merely uses geometric structures of E we also succeed in determining the dependence of the resulting star products on these data in finding appropriate equivalence transformations between them. Finally, the concreteness of the construction allows to obtain explicit formulas even for a wide class of derivations and self-equivalences of the products. Moreover, we can show that some of our products are in direct relation to the universal enveloping algebra associated to the Lie algebroid. Finally, we show that for a certain class of star products on E^* the integration with respect to a density with vanishing modular vector field defines a trace functional.
System size dependence of freeze-out properties at RHIC
Creators: name: Iordanova, A.
name: Barannikova, O.
name: Hollis, R. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The STAR experiment at RHIC has measured identified pi(+/-), K(+/-) and p(pbar) spectra and ratios from sqrt(s_NN) = 62.4 and 200 GeV Cu+Cu collisions. The new Cu+Cu results are studied with hydro-motivated blast-wave and statistical model frameworks in order to characterize the freeze-out properties of this system. Along with measurements from Au+Au and p+p collisions, the obtained freeze-out parameters are discussed as a function of collision energy, system size, centrality and inferred energy density. This multi-dimensional systematic study reveals the importance of the collision geometry and furthers our understanding of the QCD phases.
description: 6 pages, 6 figures, poster proceedings for the Quark Matter 2006 Conference, Shanghai, China, 14th-20th Novermber 2006, submitted to the International Journal of Modern Physics E
ПОЛІЛОГ КУЛЬТУР:  ОСВІТНІЙ І КУЛЬТУРОЛОГІЧНИЙ АСПЕКТИ
Creators: name: Шевкопляс Л.В.
Publisher: name: Zenodo
Year: 2019
Subjects: pedagogy
Ukrainian language
philosophy
teaching foreign languages
linguistics
literature

description: У збірнику представлені результати досліджень семантичних, структурних, прагматичних і лінгвокогнітивних особливостей одиниць різних підсистем англійської мови, висвітлено актуальні питання філософського, культурологічного та літературознавчого аналізу тексту, а також методики викладання рідної та іноземних мов і літератур у контексті нової парадигми освіти.
A global Carleman estimate in a transmission wave equation and application to a one-measurement inverse problem
Creators: name: Baudouin, Lucie
name: Mercado, Alberto
name: Osses, Axel
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35R30, 35L20

description: We consider a transmission wave equation in two embedded domains in $R^2$, where the speed is $a1 > 0$ in the inner domain and $a2 > 0$ in the outer domain. We prove a global Carleman inequality for this problem under the hypothesis that the inner domain is strictly convex and $a1 > a2$ . As a consequence of this inequality, uniqueness and Lip- schitz stability are obtained for the inverse problem of retrieving a stationary potential for the wave equation with Dirichlet data and discontinuous principal coefficient from a single time-dependent Neumann boundary measurement.
C^*-algebraic approach to the Bose-Hubbard model
Creators: name: Adams, Stefan
name: Dorlas, Tony
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82B10, 81R15, 82B26

description: We give a new derivation of the variational formula for the pressure of the long-range-hopping Bose-Hubbard model, which was first proved in \cite{BD}. The proof is analogous to that of a theorem on noncommutative large deviations introduced by Petz, Raggio and Verbeure \cite{PRV} and could similarly be extended to more general Bose system of mean-field type. We apply this formalism to prove Bose-Einstein condensation for the case of small coupling.
PERSIAN AND UZBEK INTERPRETATION OF SIMILES IN THE WORKS OF SAID AHMAD (IN THE CASE OF THE "HORIZON" TRILOGY)
Creators: name: Azimbayeva, Nargiza
Publisher: name: Zenodo
Year: 2023

description: In this article, we compared and interpreted the similes used in the works of Said Ahmed with Persian similes. At the same time, we focused on their lexical, semantic and stylistic features. Said Ahmad, one of the famous Uzbek writers, used similes very widely in his works. Similes are often found in artistic works due to their stylistic features. Similes are one of the tools that have great artistic and stylistic potential in our speech and provide expressiveness and attractiveness of speech. Similes in works of art not only perform a methodological task, but also show how wide the imagination of the writer is.
Universal hybrid quantum computing in trapped ions
Creators: name: Sutherland, R. T.
name: Srinivas, R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Using discrete and continuous variable subsystems, hybrid approaches to quantum information could enable more quantum computational power for the same physical resources. Here, we propose a hybrid scheme that can be used to generate the necessary Gaussian and non-Gaussian operations for universal continuous variable quantum computing in trapped ions. This scheme utilizes two linear spin-motion interactions to generate a broad set of non-linear effective spin-motion interactions including one and two mode squeezing, beam splitter, and trisqueezing operations in trapped ion systems. We discuss possible experimental implementations using laser-based and laser-free approaches.
Summary report describing current state-of-the-art developments on efficiency determination methods for wind turbines and nacelles in the field and on test benches respectively, their traceability, and general methods for direct and indirect efficiency determination
Creators: name: Zweiffel, Maximilian
name: Quintanilla Crespo, Juan Manuel
name: Vavrečka, Lukáš
name: Sáenz-Nuño, María A.
name: Maldonado, Javier
name: Eich, Norbert
name: Zhang, Hongkun
name: Fidelus, Janusz
name: Oliveira, Rafael S.
name: Mester, Christian
name: Lehrmann, Christian
name: Song, Zihang
name: Yogal, Nijan
name: Teigelkötter, Johannes
name: Bernabeu, Eusebio
name: Kananen, Timo
name: Weidinger, Paula
Publisher: name: Zenodo
Year: 2021
Subjects: WindEFCY
EMPIR
Horizon2020
19ENG08
Nacelle efficiency
Wind turbine efficiency
Direct efficiency determination
Indirect efficiency determination
Efficiency of rotating electrical machines
EURAMET

description: This report has been produced within the EMPIR project entitled Traceable Mechanical and Electrical Power Measurement for Efficiency Determination of Wind Turbines or 19ENG08 WindEFCY. More information about this collaborative research project can be found on the project’s website https://www.ptb.de/empir2020/windefcy/home/. This report aims to investigate the multitude of influencing variables and the changing boundary conditions for measurements to determine the efficiency of wind turbines. Moreover, through a systematic comparison of direct and indirect efficiency determination methods for rotating electrical machines, the challenges for designing an efficiency determination procedure for nacelles and their components on test benches is examined.
description: The project 19ENG08 – WindEFCY has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation programme.
Mixed Meson Masses with Domain-Wall Valence and Staggered Sea Fermions
Creators: name: Orginos, Kostas
name: Walker-Loud, Andre
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Mixed action lattice calculations allow for an additive lattice spacing dependent mass renormalization of mesons composed of one sea and one valence quark, regardless of the type of fermion discretization methods used in the valence and sea sectors. The value of the mass renormalization depends upon the lattice actions used. This mixed meson mass shift is an important lattice artifact to determine for mixed action calculations; because it modifies the pion mass, it plays a central role in the low energy dynamics of all hadronic correlation functions. We determine the leading order, $\mathcal{O}(a^2)$, and next to leading order, $\mathcal{O}(a^2 m_π^2)$, additive mass shift of \textit{valence-sea} mesons for a mixed lattice action with domain-wall valence fermions and rooted staggered sea fermions, relevant to the majority of current large scale mixed action lattice efforts. We find that on the asqtad improved coarse MILC lattices, this additive mass shift is well parameterized in lattice units by $Δ(am)^2 = 0.034(2) -0.06(2) (a m_π)^2$, which in physical units, using $a=0.125$ fm, corresponds to $Δ(m)^2 = (291\pm 8 \textrm{MeV})^2 -0.06(2) m_π^2$. In terms of the mixed action effective field theory parameters, the corresponding mass shift is given by $a^2 Δ_\mathrm{Mix} = (316 \pm 4 \textrm{MeV})^2$ at leading order plus next-to-leading order corrections including the necessary chiral logarithms for this mixed action calculation, determined in this work. Within the precision of our calculation, one can not distinguish between the full next-to-leading order effective field theory analysis of this additive mixed meson mass shift and the parameterization given above.
description: 28 pages, 3 figures, 5 tables
The (im)possibility of strong chemical tagging
Creators: name: Casamiquela, L.
name: Castro-Ginard, A.
name: Anders, F.
name: Soubiran, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The possibility of identifying co-natal stars that have dispersed into the Galactic disc based on chemistry only is called strong chemical tagging. Its feasibility has been debated for a long time, with the promise of reconstructing the detailed star-formation history of a large fraction of stars in the Galactic disc. We investigate the feasibility of strong chemical tagging using known member stars of open clusters. We analysed the largest sample of cluster members that have been homogeneously characterised with high-resolution differential abundances for 16 different elements. We also investigated the possibility of finding the known clusters in the APOGEE DR16 red clump sample with 18 chemical species. For both purposes, we used a clustering algorithm and an unsupervised dimensionality reduction technique to blindly search for groups of stars in chemical space. Even if the internal coherence of the stellar abundances in the same cluster is high, typically 0.03 dex, the overlap in the chemical signatures of the clusters is large. In the sample with the highest precision and no field stars, we only recover 9 out of the 31 analysed clusters at a 40% threshold of homogeneity and precision. This ratio slightly increases when we only use clusters with 7 or more members. In the APOGEE sample, field stars are present along with four populated clusters. In this case, only one of the open clusters was moderately recovered. In our best-case scenario, more than 70% of the groups of stars are in fact statistical groups that contain stars belonging to different real clusters. This indicates that the chances of recovering the majority of birth clusters dissolved in the field are slim, even with the most advanced clustering techniques. We show that different stellar birth sites can have overlapping chemical signatures [abridged]
description: Accepted by A&A, in press
FEATURES OF ECO-HUMANISM DEVELOPMENT IN YOUTH
Creators: name: Khusanov, Elshod
Publisher: name: Zenodo
Year: 2023

description: The foundation of society's civilization is education, which involves passing down the experience, knowledge, culture, and spirituality acquired by our ancestors to future generations. Therefore, the key to human survival on our planet, especially in today's harsh environmental conditions, is an education system that emphasizes the interaction between humans and nature. From a scientific standpoint, developing eco-humanism among all citizens, including students, is crucial in solving environmental problems and preventing them from arising in the future..
Statistical properties of linear Majorana fermions
Creators: name: Lima, F. C. E.
name: Moreira, A. R. P.
name: Machado, L. E. S.
name: Almeida, C. A. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A Majorana fermion is the single fermionic particle that is its own antiparticle. Its dynamics is determined by the Majorana equation, where the spinor field is by definition equal to its charge-conjugate field. In this paper, we investigated Shannon's entropy of linear Majorana fermions to understand how this quantity is modified due to an external potential of the linear type linear. Subsequently, we turn our attention to the construction of an ensemble of these Majorana particles to study the thermodynamic properties of the model. Finally, we show how Shannon's entropy and thermodynamic properties are modified under the linear potential action.
description: 26 pages, 7 figures
Hazard models with varying coefficients for multivariate failure time data
Creators: name: Cai, Jianwen
name: Fan, Jianqing
name: Zhou, Haibo
name: Zhou, Yong
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62G05 (Primary) 62N01, 62N02 (Secondary)

description: Statistical estimation and inference for marginal hazard models with varying coefficients for multivariate failure time data are important subjects in survival analysis. A local pseudo-partial likelihood procedure is proposed for estimating the unknown coefficient functions. A weighted average estimator is also proposed in an attempt to improve the efficiency of the estimator. The consistency and asymptotic normality of the proposed estimators are established and standard error formulas for the estimated coefficients are derived and empirically tested. To reduce the computational burden of the maximum local pseudo-partial likelihood estimator, a simple and useful one-step estimator is proposed. Statistical properties of the one-step estimator are established and simulation studies are conducted to compare the performance of the one-step estimator to that of the maximum local pseudo-partial likelihood estimator. The results show that the one-step estimator can save computational cost without compromising performance both asymptotically and empirically and that an optimal weighted average estimator is more efficient than the maximum local pseudo-partial likelihood estimator. A data set from the Busselton Population Health Surveys is analyzed to illustrate our proposed methodology.
description: Published at http://dx.doi.org/10.1214/009053606000001145 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Self-Directed Learning in the Workplace
Creators: name: Conn, Amy Buhl
Publisher: name: Digital Repository at the University of Maryland
Year: 2000

description: Rapid changes in workplace (e.g., technology, organizational structure)
increase the complexity of work which, in turn, increases the demand for continual
learning. Current training efforts, in which organizations sponsor employee
training in some form, are insufficient in meeting this demand for training. As a
result, organizations have embraced the principles of self-directed learning (SDL)
and encouraged employees to assume some responsibility for their own learning.
Yet, the effectiveness of SDL in the workplace has received little empirical
attention. Previous research has demonstrated that individuals high in SDL
readiness (i.e., individuals who prefer guiding and directing their own learning as
opposed to a teacher-centered format) received higher overall performance ratings.
However, researchers have not examined the effect of actual SDL experience on
either overall performance or performance in the specific area related to those SDL
experiences. While it has been maintained that SDL is an effective form of
workplace training to improve job performance, this assumption has not been
tested. The goal of the present research was to test this assertion by evaluating a
SDL program (i.e., an on-line listening skills course) currently in place. Measures
of individuals' SDL readiness, work locus of control, cognitive ability, SDL
activities, learning acquisition, and job performance were examined before and
after engaging in the SDL program. A control group was secured for comparison,
thereby providing a better test of the propositions. Results supported many of the
proposed relationships. In particular, SDL readiness and work locus of control
predicted membership in the target SDL course and the extent to which participants
engaged in the course. Participation in the listening skills course and the extent to
which they engaged in the course predicted greater learnings, which in turn
predicted improved listening skills performance three months after the completion
of the course. Implications of the results as it relates to past research, limitations of
the study, and directions for future research are discussed.
The Israeli Nationality Law – A Blueprint for a 21st Century Settler Colonial State
Creators: name: Pappé, Ilan
Publisher: name: Nuovi Autoritarismi e Democrazie: Diritto, Istituzioni, Società (NAD-DIS)
Year: 2019

description: The author argues that the ‘New’ Israeli Nationality Law is, despite its name, a natural, almost inevitable, product of the Zionist project in Palestine. Besides representing Zionist ideology, the law is part of a long-term attempt by the Israeli government to adjust Zionism to present-day realities and solve the so-called ‘demographic problem’ of the Jewish State.
description: Nuovi Autoritarismi e Democrazie: Diritto, Istituzioni, Società (NAD-DIS), V. 1, N. 1 (2019)
Constructive solution of a bilinear optimal control problem for a Schrödinger equation
Creators: name: Baudouin, Lucie
name: Salomon, Julien
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 49M30, 49K20

description: Often considered in numerical simulations related to the control of quantum systems, the so-called monotonic schemes have not been so far much studied from the functional analysis point of view. Yet, these procedures provide an efficient constructive method for solving a certain class of optimal control problems. This paper aims both at extending the results already available about these algorithms in the finite dimensional case (i.e., the time-discretized case) and at completing those of the continuous case. This paper starts with some results about the regularity of a functional related to a wide class of model in quantum chemistry. Those enable us to extend an inequality due to
Isotope dependence of band-gap energy
Creators: name: Plekhanov, V. G.
name: Plekhanov, N. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The results of the quantitative investigations of the renormalization of the absorption edge of different compounds by the isotope effect are described.
description: 7 pages, 3 figures
Recensione. Women of the Wall, Navigating Religion in Sacred Sites, Y. Jobani e N. Perez, Oxford University Press, 2017, pp. 233
Creators: name: Iannotti, Deborah S.
Publisher: name: Nuovi Autoritarismi e Democrazie: Diritto, Istituzioni, Società (NAD-DIS)
Year: 2019

description: Sasha Lutt, una dodicenne di Be’er Sheva, non poteva immaginare che l’orazione che stava recitando leggendo dalla Torah presso il Kotel (Il Muro del Pianto) in un mite ottobre del 2014, sarebbe passata alla storia.
description: Nuovi Autoritarismi e Democrazie: Diritto, Istituzioni, Società (NAD-DIS), V. 1, N. 1 (2019)
Euler equations are not exactly controllable by a finite-dimensional external force
Creators: name: Shirikyan, Armen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 35Q35, 93B05, 93C20

description: We show that the Euler system is not exactly controllable by a finite-dimensional external force. The proof is based on the comparison of the Kolmogorov epsilon-entropy for Holder spaces and for the class of functions that can be obtained by solving the 2D Euler equations with various right-hand sides.
description: 12 pages
Direct Numerical Simulations of Cosmic-ray Acceleration at Dense Circumstellar Medium: Magnetic Field Amplification by Bell Instability and Maximum Energy
Creators: name: Inoue, Tsuyoshi
name: Marcowith, Alexandre
name: Giacinti, Gwenael
name: van Marle, Allard Jan
name: Nishino, Shogo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Galactic cosmic rays are believed to be accelerated at supernova remnants. However, whether supernova remnants can be Pevatrons is still very unclear. In this work we argue that PeV cosmic rays can be accelerated during the early phase of a supernova blast wave expansion in dense red supergiant winds. We solve in spherical geometry a system combining a diffusive-convection equation which treats cosmic-ray dynamics coupled to magnetohydrodynamics to follow gas dynamics. The fast shock expanding in a dense ionized wind is able to trigger the fast non-resonant streaming instability over day timescales, and energizes cosmic-rays even under the effect of p-p losses. We find that such environments make the blast wave a Pevatron, although the maximum energy depends on various parameters such as the injection rate and mass-loss rate of the winds. Multi-PeV energies can be reached if the progenitor mass loss rates are of the order of $10^{-3}$ Msun yr$^{-1}$. It has been recently invoked that, prior to the explosion, hydrogen rich massive stars can produce enhanced mass loss rates. These enhanced rates would then favor the production of a Pevatron phase in early times after the shock breakout.
description: 15 pages, 21 figures, accepted by the Astrophysical Journal
BEC-BCS Crossover of a Trapped Two-Component Fermi Gas with Unequal Masses
Creators: name: von Stecher, J.
name: Greene, C. H.
name: Blume, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We determine the energetically lowest lying states in the BEC-BCS crossover regime of s-wave interacting two-component Fermi gases under harmonic confinement by solving the many-body Schrodinger equation using two distinct approaches. Essentially exact basis set expansion techniques are applied to determine the energy spectrum of systems with N=4 fermions. Fixed-node diffusion Monte Carlo methods are applied to systems with up to N=20 fermions, and a discussion of different guiding functions used in the Monte Carlo approach to impose the proper symmetry of the fermionic system is presented. The energies are calculated as a function of the s-wave scattering length a_s for N=2-20 fermions and different mass ratios κof the two species. On the BEC and BCS sides, our energies agree with analytically-determined first-order correction terms. We extract the scattering length and the effective range of the dimer-dimer system up to κ= 20. Our energies for the strongly-interacting trapped system in the unitarity regime show no shell structure, and are well described by a simple expression, whose functional form can be derived using the local density approximation, with one or two parameters. The universal parameter ξfor the trapped system for various κis determined, and comparisons with results for the homogeneous system are presented.
description: 11 pages, 6 figures, extended version
A quantum information-theoretic proof of the relation between Horn's problem and the Littlewood-Richardson coefficients
Creators: name: Christandl, Matthias
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Horn's problem asks for the conditions on sets of integers mu, nu and lambda that ensure the existence of Hermitian operators A, B and A+B with spectra mu, nu and lambda, respectively. It has been shown that this problem is equivalent to deciding whether the irreducible representation of GL(d) with highest weight lambda is contained in the tensor product of irreducible representations with highest weight mu and nu. In this paper we present a quantum information-theoretic proof of the relation between the two problems that is asymptotic in one direction. This result has previously been obtained by Klyachko using geometric invariant theory. The work presented in this paper does not, however, touch upon the non-asymptotic equivalence between the two problems, a result that rests on the recently proven saturation conjecture for GL(d).
description: 9 pages
Measuring a Kaluza-Klein radius smaller than the Planck length
Creators: name: Reifler, Frank
name: Morris, Randall
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Hestenes has shown that a bispinor field on a Minkowski space-time is equivalent to an orthonormal tetrad of one-forms together with a complex scalar field. More recently, the Dirac and Einstein equations were unified in a tetrad formulation of a Kaluza-Klein model which gives precisely the usual Dirac-Einstein Lagrangian. In this model, Dirac's bispinor equation is obtained in the limit for which the radius of higher compact dimensions of the Kaluza-Klein manifold becomes vanishingly small compared with the Planck length. For a small but finite radius, the Kaluza-Klein model predicts velocity splitting of single fermion wave packets. That is, the model predicts a single fermion wave packet will split into two wave packets with slightly different group velocities. Observation of such wave packet splits would determine the size of the Kaluza-Klein radius. If wave packet splits were not observed in experiments with currently achievable accuracies, the Kaluza-Klein radius would be at least twenty five orders of magnitude smaller than the Planck length.
APOGEE view of the globular cluster NGC 6544
Creators: name: Gran, F.
name: Zoccali, M.
name: Rojas-Arriagada, A.
name: Saviane, I.
name: Ramos, R. Contreras
name: Beaton, R.
name: Bizyaev, D.
name: Cohen, R. E.
name: Fernández-Trincado, J. G.
name: García-Hernández, D. A.
name: Geisler, D.
name: Lane, R. R.
name: Minniti, D.
name: Bidin, C. Moni
name: Nitschelm, C.
name: Carvajal, J. Olivares
name: Pan, K.
name: Rojas, F. I.
name: Villanova, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The second phase of the APOGEE survey is providing near-infrared, high-resolution, high signal-to-noise spectra of stars in the halo, disk, bar and bulge of the Milky Way. The near-infrared spectral window is especially important in the study of the Galactic bulge, where stars are obscured by the dust and gas of the disk in its line-of-sight. We present a chemical characterisation of the globular cluster NGC 6544 with high-resolution spectroscopy. The characterisation of the cluster chemical fingerprint, given its status of "interloper" towards the Galactic bulge and clear signatures of tidal disruption in its core is crucial for future chemical tagging efforts. Cluster members were selected from the DR16 of the APOGEE survey, using chemo-dynamical criteria of individual stars. A sample of 23 members of the cluster was selected. An analysis considering the intra-cluster abundance variations, known anticorrelations is given. According to the RGB content of the cluster, the iron content and $α$-enhancement are [Fe/H] $= -1.44 \pm 0.04$ dex and [$α$/Fe] $= 0.20 \pm 0.04$ dex, respectively. Cluster members show a significant spread in [Fe/H] and [Al/Fe] that is larger than expected based on measurement errors. An [Al/Fe] spread, signal of an Mg-Al anticorrelation is observed and used to constraint the cluster mass budget, along with C, N, Mg, Si, K, Ca, and Ce element variations are discussed. Across all the analysed evolutionary stages (RGB and AGB), about $\sim2/3$ (14 out of 23) show distinct chemical patterns, possibly associated with second-generation stars.
description: 16 pages, 9 figures, MNRAS accepted
Nonergodic thermodynamics of disordered ferromagnets and ferroelectrics
Creators: name: Timonin, P. N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Phenomenological thermodynamic theory describing the properties of metastable states in disordered ferromagnets and ferroelectrics with frustrative random interactions is developed and its ability to describe various nonergodic phenomena in real crystals is demonstrated.
description: 15 pages, 13 figures
On Representation Learning for Scientific News Articles Using Heterogeneous Knowledge Graphs
Creators: name: Romanou, Angelika
name: Smeros, Panayiotis
name: Aberer, Karl
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In the era of misinformation and information inflation, the credibility assessment of the produced news is of the essence. However, fact-checking can be challenging considering the limited references presented in the news. This challenge can be transcended by utilizing the knowledge graph that is related to the news articles. In this work, we present a methodology for creating scientific news article representations by modeling the directed graph between the scientific news articles and the cited scientific publications. The network used for the experiments is comprised of the scientific news articles, their topic, the cited research literature, and their corresponding authors. We implement and present three different approaches: 1) a baseline Relational Graph Convolutional Network (R-GCN), 2) a Heterogeneous Graph Neural Network (HetGNN) and 3) a Heterogeneous Graph Transformer (HGT). We test these models in the downstream task of link prediction on the: a) news article - paper links and b) news article - article topic links. The results show promising applications of graph neural network approaches in the domains of knowledge tracing and scientific news credibility assessment.
HUDF-JD2: Mid-infrared Evidence for a z~2 Luminous Infrared Galaxy
Creators: name: Chary, Ranga-Ram
name: Teplitz, Harry I.
name: Dickinson, Mark E.
name: Koo, David C.
name: Floc'h, Emeric Le
name: Marcillac, Delphine
name: Papovich, Casey
name: Stern, Daniel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Hubble Ultra Deep Field source JD2 presented in Mobasher et al. (2005) is an unusual galaxy that is very faint at all wavelengths shortward of 1.1 micron. Photometric redshift fits to data at 0.4 to 8 microns yield a significant probability that it is an extremely massive galaxy at z~6.5. In this paper we present new photometry at 16 microns and 22 micron from Spitzer Infrared Spectrograph (IRS) peak-up imaging of the Great Observatories Origins Deep Survey (GOODS) fields. We find that the spectral energy distribution shows a factor of ~4 rise in flux density between the 16 micron and 22 micron bandpass which is most likely due to the entrance of polycyclic aromatic hydrocarbon emission features into the 22 micron and 24 micron passbands. The flux ratio between these bandpasses can be best fit by a z~1.7 luminous infrared galaxy with a bolometric luminosity of (2-6)\times10^{11} L_sun corresponding to a star-formation rate of 80 M_sun/yr. The predicted flux density values at other longer wavelengths are below the detection limits of current instrumentation but such sources could potentially be detected in lensed submillimeter surveys. Re-evaluation of the optical/near-infrared photometry continues to favor z>6 photometric redshift solutions, but we argue that the consistency of the multiwavelength parameters of this galaxy with other dusty starbursts favor the z~2 mid-infrared photometric redshift. The data presented here provide evidence that optically undetected near-infrared sources which are detected at 24 microns are most likely dusty, starburst galaxies at a redshift of z~2 with stellar masses >10^{10} M_sun.
description: 20 pages, 6 figures (color), 3 tables, 2007, ApJ, 665 vol.1 (10 August)
Libro de códigos de la narrativa de las guias de barrio de Airbnb. 2019
Creators: name: Omitted For Peer Review Indications
Publisher: name: figshare
Year: 2021
Subjects: subject: 150603 Tourism Management
subject: FOS: Economics and business

description: This is the Codebook created to codify the narrative of Airbnb's Neighbourhoods Guides
The development and piloting of performance measures at the main enquiry desk of Leicester University Library
Creators: name: Tognarelli, Paul A.
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 89999 Information and Computing Sciences not elsewhere classified
subject: FOS: Computer and information sciences

description: The development and piloting of performance measures at the main enquiry desk of Leicester University Library
The competing effect of gas and stars in massive black hole binaries evolution
Creators: name: Bortolas, Elisa
name: Franchini, Alessia
name: Bonetti, Matteo
name: Sesana, Alberto
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences
subject: 85A05

description: Massive black hole binaries are predicted to form during the hierarchical assembly of cosmic structures and will represent the loudest sources of low-frequency gravitational waves (GWs) detectable by present and forthcoming GW experiments. Before entering the GW-driven regime, their evolution is driven by the interaction with the surrounding stars and gas. While stellar interactions are found to always shrink the binary, recent studies predict the possibility of binary outspiral mediated by the presence of a gaseous disk, which could endlessly delay the coalescence and impact the merger rates of massive binaries. Here we implement a semi-analytical treatment that follows the binary evolution under the combined effect of stars and gas. We find that binaries may outspiral only if they accrete near or above their Eddington limit and only until their separation reaches the gaseous disk self-gravitating radius. Even in case of an outspiral, the binary eventually reaches a large enough mass for GW to take over and drive it to coalescence. The combined action of stellar hardening, mass growth and GW-driven inspiral brings binaries to coalescence in few hundreds Myr at most, implying that gas-driven expansion will not severely affect the detection prospects of upcoming GW facilities.
description: 11 pages, 6 figures, Published in ApJ Letters
Obliquity Constraints on the Planetary-mass Companion HD 106906 b
Creators: name: Bryan, Marta L.
name: Chiang, Eugene
name: Morley, Caroline V.
name: Mace, Gregory N.
name: Bowler, Brendan P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We constrain the angular momentum architecture of HD 106906, a 13 $\pm$ 2 Myr old system in the ScoCen complex composed of a compact central binary, a widely separated planetary-mass tertiary HD 106906 b, and a debris disk nested between the binary and tertiary orbital planes. We measure the orientations of three vectors: the companion spin axis, companion orbit normal, and disk normal. Using near-IR high-resolution spectra from Gemini/IGRINS, we obtain a projected rotational velocity of $v\sin{i_p}$ = 9.5 $\pm$ 0.2 km/s for HD 106906 b. This measurement together with a published photometric rotation period implies the companion is viewed nearly pole-on, with a line-of-sight spin axis inclination of $i_p$ = 14 $\pm$ 4 degrees or 166 $\pm$ 4 degrees. By contrast, the debris disk is known to be viewed nearly edge-on. The likely misalignment of all three vectors suggests HD 106906 b formed by gravitational instability in a turbulent environment, either in a disk or cloud setting.
description: accepted to AJ. 14 pages, 7 figures
Dyons with potentials: duality and black hole thermodynamics
Creators: name: Barnich, Glenn
name: Gomberoff, Andres
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A modified version of the double potential formalism for the electrodynamics of dyons is constructed. Besides the two vector potentials, this manifestly duality invariant formulation involves four additional potentials, scalar potentials which appear as Lagrange multipliers for the electric and magnetic Gauss constraints and potentials for the longitudinal electric and magnetic fields. In this framework, a static dyon appears as a Coulomb-like solution without string singularities. Dirac strings are needed only for the Lorentz force law, not for Maxwell's equations. The magnetic charge no longer appears as a topological conservation law but as a surface integral on a par with electric charge. The theory is generalized to curved space. As in flat space, the string singularities of dyonic black holes are resolved. As a consequence all singularities are protected by the horizon and the thermodynamics is shown to follow from standard arguments in the grand canonical ensemble.
description: 33 pages Latex file, additional typos corrected, references added
An inverse problem for Schrödinger equations with discontinuous main coefficient
Creators: name: Baudouin, Lucie
name: Mercado, Alberto
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35R30, 35Q40

description: This paper concerns the inverse problem of retrieving a stationary potential for the Schrödinger evolution equation in a bounded domain of RN with Dirichlet data and discontinuous principal coefficient a(x) from a single time-dependent Neumann boundary measurement. We consider that the discontinuity of a is located on a simple closed hyper-surface called the interface, and a is constant in each one of the interior and exterior domains with respect to this interface. We prove uniqueness and lipschitz stability for this inverse problem under certain convexity hypothesis on the geometry of the interior domain and on the sign of the jump of a at the interface. The proof is based on a global Carleman inequality for the Schrödinger equation with discontinuous coefficients, result also interesting by itself.