cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The GOE ensemble for quasiperiodic tilings without unfolding: $r$-value statistics
Creators: name: Grimm, Uwe
name: Römer, Rudolf A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the level-spacing statistics for non-interacting Hamiltonians defined on the two-dimensional quasiperiodic Ammann--Beenker (AB) tiling. When applying the numerical procedure of "unfolding", these spectral properties in each irreducible sector are known to be well-described by the universal Gaussian orthogonal random matrix ensemble. However, the validity and numerical stability of the unfolding procedure has occasionally been questioned due to the fractal self-similarity in the density of states for such quasiperiodic systems. Here, using the so-called $r$-value statistics for random matrices, $P(r)$, for which no unfolding is needed, we show that the Gaussian orthogonal ensemble again emerges as the most convincing level statistics for each irreducible sector. The results are extended to random-AB tilings where random flips of vertex connections lead to the irreducibility.
description: 5 PRB-style pages, 2 figures, submitted to Physical Review B, with additional results not available in the PRB
The algebro-geometric initial value problem for the Ablowitz-Ladik hierarchy
Creators: name: Gesztesy, F.
name: Holden, H.
name: Michor, J.
name: Teschl, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We discuss the algebro-geometric initial value problem for the Ablowitz-Ladik hierarchy with complex-valued initial data and prove unique solvability globally in time for a set of initial (Dirichlet divisor) data of full measure. To this effect we develop a new algorithm for constructing stationary complex-valued algebro-geometric solutions of the Ablowitz-Ladik hierarchy, which is of independent interest as it solves the inverse algebro-geometric spectral problem for general (non-unitary) Ablowitz-Ladik Lax operators, starting from a suitably chosen set of initial divisors of full measure. Combined with an appropriate first-order system of differential equations with respect to time (a substitute for the well-known Dubrovin-type equations), this yields the construction of global algebro-geometric solutions of the time-dependent Ablowitz-Ladik hierarchy. The treatment of general (non-unitary) Lax operators associated with general coefficients for the Ablowitz-Ladik hierarchy poses a variety of difficulties that, to the best of our knowledge, are successfully overcome here for the first time. Our approach is not confined to the Ablowitz-Ladik hierarchy but applies generally to (1+1)-dimensional completely integrable soliton equations of differential-difference type.
description: 47 pages
Doped orbitally-ordered systems: another case of phase separation
Creators: name: Kugel, K. I.
name: Rakhmanov, A. L.
name: Sboychakov, A. O.
name: Khomskii, D. I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A possible mechanism of electronic phase separation in the systems with orbital ordering is analyzed. We suggest a simple model taking into account an interplay between the delocalization of charge carriers introduced by doping and the cooperative ordering of local lattice distortions. The proposed mechanism is quite similar to the double exchange usually invoked for interpretation of phase separation in doped magnetic oxides like manganites, but can be efficient even in the absence of any magnetic ordering. It is demonstrated that the delocalized charge carriers favor the formation of nanoscale inhomogeneities with the orbital structure different from that in the undoped material. The directional character of orbitals leads to inhomogeneities of different shapes and sizes.
description: 7 pages, 4 figures, submitted to Phys. Rev. B
Ultra High Energy Nuclei Propagation
Creators: name: Aloisio, Roberto
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the problem of ultra high energy nuclei propagation in astrophysical backgrounds. We present a new analytical computation scheme based on the hypothesis of continuos energy losses in a kinetic formulation of the particles propagation. This scheme enables the computation of the fluxes of ultra high energy nuclei as well as the fluxes of secondaries (nuclei and nucleons) produced by the process of photo-disintegration suffered by nuclei.
description: 3 pages, 2 eps figures, invited talk given at the IFAE 2008, Bologna, Italy, 26-28 March 2008
Muon Spin Spectroscopy evidence of the violation of Anderson condition in magnetite
Creators: name: Bimbi, M.
name: Allodi, G.
name: De Renzi, R.
name: Mazzoli, C.
name: Berger, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present new muon spectroscopy data on a Fe$_3$O$_4$ single crystal, revealing different spin precession patterns in five distinct temperature ranges. A careful analysis of the local field and its straightforward modeling obtains surprisingly good agreement with experiments only if a very specific model of localized charges violating Anderson condition, and a correlated muon local dynamics are implemented. Muon evidence for fluctuations just above the Verwey temperature, precursor of the low temperature charge localized state, is provided.
description: 4 pages, 5 figures, Additional material EPAPS.pdf (2 pages, 2 figure), submitted to Phys. Rev. Lett
Mutually improved endoscopic image synthesis and landmark detection in unpaired image-to-image translation
Creators: name: Sharan, Lalith
name: Romano, Gabriele
name: Koehler, Sven
name: Kelm, Halvar
name: Karck, Matthias
name: De Simone, Raffaele
name: Engelhardt, Sandy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The CycleGAN framework allows for unsupervised image-to-image translation of unpaired data. In a scenario of surgical training on a physical surgical simulator, this method can be used to transform endoscopic images of phantoms into images which more closely resemble the intra-operative appearance of the same surgical target structure. This can be viewed as a novel augmented reality approach, which we coined Hyperrealism in previous work. In this use case, it is of paramount importance to display objects like needles, sutures or instruments consistent in both domains while altering the style to a more tissue-like appearance. Segmentation of these objects would allow for a direct transfer, however, contouring of these, partly tiny and thin foreground objects is cumbersome and perhaps inaccurate. Instead, we propose to use landmark detection on the points when sutures pass into the tissue. This objective is directly incorporated into a CycleGAN framework by treating the performance of pre-trained detector models as an additional optimization goal. We show that a task defined on these sparse landmark labels improves consistency of synthesis by the generator network in both domains. Comparing a baseline CycleGAN architecture to our proposed extension (DetCycleGAN), mean precision (PPV) improved by +61.32, mean sensitivity (TPR) by +37.91, and mean F1 score by +0.4743. Furthermore, it could be shown that by dataset fusion, generated intra-operative images can be leveraged as additional training data for the detection network itself. The data is released within the scope of the AdaptOR MICCAI Challenge 2021 at https://adaptor2021.github.io/, and code at https://github.com/Cardio-AI/detcyclegan_pytorch.
description: Accepted for IEEE JBHI 2021, 13 pages, 8 figures, 4 tables
[OIII] emitters in the field of the MRC 0316-257 protocluster
Creators: name: Maschietto, F.
name: Hatch, N. A.
name: Venemans, B. P.
name: Röttgering, H. J. A.
name: Miley, G. K.
name: Overzier, R. A.
name: Dopita, M. A.
name: Eisenhardt, P. R.
name: Kurk, J. D.
name: Meurer, G. R.
name: Pentericci, L.
name: Rosati, P.
name: Stanford, S. A.
name: van Breugel, W.
name: Zirm, A. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Venemans et al. (2005) found evidence for an overdensity of Ly-alpha emission line galaxies associated with the radio galaxy MRC 0316-257 at z=3.13 indicating the presence of a massive protocluster. Here, we present the results of a search for additional star-forming galaxies and AGN within the protocluster. Narrow-band infrared imaging was used to select candidate [O III] emitters in a 1.1 x 1.1 Mpc^2 region around the radio galaxy. Thirteen candidates have been detected. Four of these are among the previously confirmed sample of Ly-alpha galaxies, and an additional three have been confirmed through follow-up infrared spectroscopy. The three newly confirmed objects lie within a few hundred km/s of each other, but are blueshifted with respect to the radio galaxy and Ly-alpha emitters by ~2100 km/s. Although the sample is currently small, our results indicate that the radio-selected protocluster is forming at the centre of a larger, ~60 co-moving Mpc super-structure. On the basis of an HST/ACS imaging study we calculate dust-corrected star-formation rates and investigate morphologies and sizes of the [O III] candidate emitters. From a comparison of the star formation rate derived from UV-continuum and [O III] emission, we conclude that at least two of the [O III] galaxies harbour an AGN which ionized the O+ gas.
description: 11 pages, 6 figures. Accepted for publication in MNRAS
Optimization of the Asymptotic Property of Mutual Learning Involving an Integration Mechanism of Ensemble Learning
Creators: name: Hara, Kazuyuki
name: Yamada, Takahiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose an optimization method of mutual learning which converges into the identical state of optimum ensemble learning within the framework of on-line learning, and have analyzed its asymptotic property through the statistical mechanics method.The proposed model consists of two learning steps: two students independently learn from a teacher, and then the students learn from each other through the mutual learning. In mutual learning, students learn from each other and the generalization error is improved even if the teacher has not taken part in the mutual learning. However, in the case of different initial overlaps(direction cosine) between teacher and students, a student with a larger initial overlap tends to have a larger generalization error than that of before the mutual learning. To overcome this problem, our proposed optimization method of mutual learning optimizes the step sizes of two students to minimize the asymptotic property of the generalization error. Consequently, the optimized mutual learning converges to a generalization error identical to that of the optimal ensemble learning. In addition, we show the relationship between the optimum step size of the mutual learning and the integration mechanism of the ensemble learning.
description: 13 pages, 3 figures, submitted to Journal of Physical Society of Japan
Discovering Dark Matter at the LHC through Its Nuclear Scattering in Far-Forward Emulsion and Liquid Argon Detectors
Creators: name: Batell, Brian
name: Feng, Jonathan L.
name: Ismail, Ahmed
name: Kling, Felix
name: Abraham, Roshan Mammen
name: Trojanowski, Sebastian
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The LHC may produce light, weakly-interacting particles that decay to dark matter, creating an intense and highly collimated beam of dark matter particles in the far-forward direction. We investigate the prospects for detecting this dark matter in two far-forward detectors proposed for a future Forward Physics Facility: FASER$ν$2, a 10-tonne emulsion detector, and FLArE, a 10- to 100-tonne LArTPC. We focus here on nuclear scattering, including elastic scattering, resonant pion production, and deep inelastic scattering, and devise cuts that efficiently remove the neutrino-induced background. In the invisibly-decaying dark photon scenario, DM-nuclear scattering probes new parameter space for dark matter masses 5 MeV $\lesssim m_χ \lesssim$ 500 MeV. When combined with the DM-electron scattering studied previously, FASER$ν$2 and FLArE will be able to discover dark matter in a large swath of the cosmologically-favored parameter space with MeV $\lesssim m_χ \lesssim $ GeV.
description: 28 pages, 8 figures, 4 tables. Version published in PRD
Renata Budziak, Deutsch als Fremdsprache in Polen. Sprachlehrbücher aus dem 16. bis 18. Jahrhundert
Creators: name: Augustynowicz, Christoph
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2013

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 62 Nr. 2 (2013): Nationalisierung und Pragmatismus. Staatliche Institutionen und Minderheiten in Polen 1918-1939
Reciprocity of Networks with Degree Correlations and Arbitrary Degree Sequences
Creators: name: Zamora--López, Gorka
name: Zlatić, Vinko
name: Zhou, Changsong
name: Štefančić, Hrvoje
name: Kurths, Jürgen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Although most of the real networks contain a mixture of directed and bidirectional (reciprocal) connections, the reciprocity $r$ has received little attention as a subject of theoretical understanding. We study the expected reciprocity of networks with an arbitrary degree sequence and a broad class of degree correlations by means of statistical ensemble approach. We demonstrate that degree correlations are crucial to understand the reciprocity in real networks and a hierarchy of correlation contributions to $r$ is revealed. Numerical experiments using novel network randomization methods show very good agreement to our analytical estimations.
description: 8 pages, 3 figures, added a new table and a new figure, accepted for publication in Phys.Rev.E
Mutual information, quantum phase transition, and phase coherence in Kondo systems
Creators: name: Dong, Jian-Jun
name: Huang, Dongchen
name: Yang, Yi-feng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We propose a static auxiliary field approximation to study the hybridization physics of Kondo systems without the sign problem and use the mutual information to measure the intersite hybridization correlations. Our method takes full account of the spatial fluctuations of the hybridization fields at all orders and overcomes the artificial (first-order) phase transition predicted in the mean-field approximation. When applied to the two-impurity Kondo model, it reveals a logarithmically divergent amplitude mutual information near the so-called "Varma-Jones" fixed point and a large phase mutual information manifesting the development of intersite phase coherence in the Kondo regime, with observable influences on physical properties. These highlight the importance of hybridization fluctuations and confirm the mutual information as a useful tool to explore the hybridization physics in Kondo systems.
description: 7 pages, 4 figures
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name: ÐÐ¾ÑÐ¾Ð½Ð¸Ð½, ÐÐ»ÐµÐºÑÐ°Ð½Ð´Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2025
Subjects: ÐÐµÐ·Ð¾Ð¿Ð°ÑÐ½Ð¾ÑÑÑ Ð¶Ð¸Ð·Ð½ÐµÐ´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ ÑÐµÐ»Ð¾Ð²ÐµÐºÐ°
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description: Ð£ÑÐµÐ±Ð½Ð¾Ðµ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ðµ Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÑÐµÑ ÑÑÑÑÐºÑÑÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð½ÑÐ¹ Ð¾Ð±Ð·Ð¾Ñ ÐºÐ»ÑÑÐµÐ²ÑÑ Ð°ÑÐ¿ÐµÐºÑÐ¾Ð² Ð³Ð¾ÑÐµÐ½Ð¸Ñ Ð¸ Ð²Ð·ÑÑÐ²Ð°, Ð° ÑÐ°ÐºÐ¶Ðµ Ð¼ÐµÑÐ¾Ð´Ð¾Ð² Ð¾ÑÐµÐ½ÐºÐ¸ Ð¸Ñ Ð²Ð¾Ð·Ð´ÐµÐ¹ÑÑÐ²Ð¸Ñ. ÐÐ½Ð¾ Ð¾ÑÐ²Ð°ÑÑÐ²Ð°ÐµÑ ÑÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ°Ð»ÑÐ½ÑÐµ Ð¿ÑÐ¸Ð½ÑÐ¸Ð¿Ñ Ð¸ ÑÐ¸Ð·Ð¸ÑÐµÑÐºÐ¸Ðµ Ð¾ÑÐ½Ð¾Ð²Ñ ÑÑÐ¸Ñ Ð¿ÑÐ¾ÑÐµÑÑÐ¾Ð², Ð¿ÑÐµÐ´Ð¾ÑÑÐ°Ð²Ð»ÑÑ ÑÐµÐºÐ¾Ð¼ÐµÐ½Ð´Ð°ÑÐ¸Ð¸ Ð¿Ð¾ Ð°Ð½Ð°Ð»Ð¸Ð·Ñ Ð²Ð¾Ð·Ð´ÐµÐ¹ÑÑÐ²ÑÑÑÐ¸Ñ ÑÐ°ÐºÑÐ¾ÑÐ¾Ð² Ð¸ Ð·Ð¾Ð½ Ð¿Ð¾ÑÐ°Ð¶ÐµÐ½Ð¸Ñ Ð² ÑÐ»ÑÑÐ°Ðµ Ð°Ð²Ð°ÑÐ¸Ð¹ Ð¸ ÑÑÐµÐ·Ð²ÑÑÐ°Ð¹Ð½ÑÑ ÑÐ¸ÑÑÐ°ÑÐ¸Ð¹, ÑÐ²ÑÐ·Ð°Ð½Ð½ÑÑ Ñ Ð¿Ð¾Ð¶Ð°ÑÐ°Ð¼Ð¸ Ð¸ Ð²Ð·ÑÑÐ²Ð°Ð¼Ð¸. Ð£ÑÐµÐ±Ð½Ð¾Ðµ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ðµ Ð¼Ð¾Ð¶ÐµÑ Ð±ÑÑÑ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¾ Ð´Ð»Ñ ÑÑÑÐ´ÐµÐ½ÑÐ¾Ð² ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ñ ÐÐ£ÐÐ¾Ð², Ð¸Ð·ÑÑÐ°ÑÑÐ¸Ñ Ð´Ð¸ÑÑÐ¸Ð¿Ð»Ð¸Ð½Ñ Â«Ð¢ÐµÐ¾ÑÐ¸Ñ Ð³Ð¾ÑÐµÐ½Ð¸Ñ Ð¸ Ð²Ð·ÑÑÐ²Ð°Â» Ð¿Ð¾ ÑÐ¿ÐµÑÐ¸Ð°Ð»ÑÐ½Ð¾ÑÑÐ¸ Â«Ð¢ÐµÑÐ½Ð¾ÑÑÐµÑÐ½Ð°Ñ Ð±ÐµÐ·Ð¾Ð¿Ð°ÑÐ½Ð¾ÑÑÑÂ».
Outcomes of Management Strategies in Patients with Autoimmune Lymphocytic Hypophysitis: A Systematic Review and Meta-analysis quality assessment appendix
Creators: name: Donegan, Diane
name: Saeed, Zeb
name: Delivanis, Danae
name: Murad, Mohammad Hassan
name: Honegger, Juergen
name: Oguz, Seda
name: Amereller, Felix
name: erickson, dana
name: Bancos, Irina
Publisher: name: figshare
Year: 2021
Subjects: subject: 110306 Endocrinology
subject: FOS: Clinical medicine

description: Appendix 1-4
Doubly Lopsided Mass Matrices from Supersymmetric SU(N) Unification
Creators: name: Barr, S. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is shown that in supersymmetric SU(N) models with N>5 the so-called doubly lopsided mass matrix structure can emerge in a natural way. The non-trivial flavor structure is entirely accounted for by the SU(N) gauge symmetry and supersymmetry, without any flavor symmetry. The hierarchy among the families results directly from a hierarchy of scales in the chain of breaking from SU(N)to the Standard Model group. A simple SU(7) example is presented.
description: 16 pages, LaTex
Esten, Russen und die estnische Staatsbürgerschaft 1992-2012. Der nur langsame Rückgang der Staatenlosigkeit in Estland Staatenlosigkeit in Estland
Creators: name: Gruber, Denis
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2012

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 61 Nr. 4 (2012)
Photo-current and photo-voltage oscillations in the two-dimensional electron system: screening and "anti-screening" of a potential profile
Creators: name: Dorozhkin, S. I.
name: Pechenezhskiy, I. V.
name: Pfeiffer, L. N.
name: West, K. W.
name: Umansky, V.
name: von Klitzing, K.
name: Smet, J. H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We observe in state-of-the-art GaAs based 2D electron systems microwave induced photo-current and photo-voltage oscillations around zero as a function of the applied magnetic field. The photo-signals pass zero whenever the microwave frequency is close to a multiple of the cyclotron resonance frequency. They originate from built-in electric fields due to for instance band bending at contacts. The oscillations correspond to a suppression (screening) or an enhancement ("anti-screening") of these fields by the photo-excited electrons.
Development of a Thermoluminescence dosimeter (TLD) using calcium sulfate that doped with dysprosium
Creators: name: J Alfawwaz, Jasem
Publisher: name: figshare
Year: 2021
Subjects: subject: 20299 Atomic, Molecular, Nuclear, Particle and Plasma Physics not elsewhere classified
subject: FOS: Physical sciences

description: One of the methods of measuring the radiation dose is using calcium sulfate as a dosimeter, and adding impurities increases the Thermoluminescence intensity of calcium sulfate. In this paper a Thermoluminescence dosimeter TLD-900 doped with Dy 0.1 mol%. Dysprosium was developed in the form of square slices with a side length of 5 mm, they were exposed to gamma rays from the Cs-137 source at doses (0, 2, 5, 10, 15, 20) mGy. We found that the Thermoluminescence intensity of the samples exposed to previous doses ( 0.151, 27, 57, 86, 151, 193) nA respectively, While for pure samples is (0.210, 0.342, 0.352, 0.313, 0.320, 0.402) nA also, a significant increase in the Thermoluminescence intensity with increasing dose, and the accumulated charge was measured on the samples (2.11, 231.1, 496.8, 755.5, 1344, 1773) nC, respectively,While for pure samples (1.96, 3.41, 3.34, 3.19, 3.85, 4.30) nC so all samples showed a good response to gamma rays within the given dose range. We find a significant increase in the response of the dosing samples was observed compared with the pure ones for the same previous doses.
Die Rezeption des Švejk in der Ersten Tschechoslowakischen Republik. Eine Neubewertung und systematische Einordnung
Creators: name: Paul, Sebastian
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2014

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 63 Nr. 2 (2014)
Measuring Linguistic Diversity During COVID-19
Creators: name: Dunn, Jonathan
name: Coupe, Tom
name: Adams, Benjamin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Computational measures of linguistic diversity help us understand the linguistic landscape using digital language data. The contribution of this paper is to calibrate measures of linguistic diversity using restrictions on international travel resulting from the COVID-19 pandemic. Previous work has mapped the distribution of languages using geo-referenced social media and web data. The goal, however, has been to describe these corpora themselves rather than to make inferences about underlying populations. This paper shows that a difference-in-differences method based on the Herfindahl-Hirschman Index can identify the bias in digital corpora that is introduced by non-local populations. These methods tell us where significant changes have taken place and whether this leads to increased or decreased diversity. This is an important step in aligning digital corpora like social media with the real-world populations that have produced them.
Sara Pesce, Laurence Olivier nei film. Shakespeare, la star, il carattere, Recco-Genova, Le Mani 2012, pp. 181, ISBN 978-88-8012-631-7
Creators: name: Pavesi, Diletta
Publisher: name: Annali Online  Lettere - Ferrara
Year: 2013

description: Annali Online  Lettere - Ferrara, VIII 1 (2013)
Instrumentality of procurement laws to implement social sustainability in Nigeria
Creators: name: Mangvwat, Joshua S.
name: Spillane, John
name: Bradley, Jim
Publisher: name: University of Limerick
Year: 2025
Subjects: classificationCode: 40
subject: Engineering

description: Construction projects can achieve social sustainability when anchored on relevant statutory instruments that support the procurement process. However, the absence of provision for social sustainability in procurement laws in Nigeria presents a significant challenge to the sector. Hence, this study documents the challenges site workers and host community face, as two key stakeholders in social sustainability. The aim is to explore how the absence of social sustainability in public procurement law affects implementation of the social agenda. Semi-structured interviews are conducted with six senior management staff with experience in public procurement in tertiary institutions. A thematic analysis of the result shows the prevalence of casualisation of labour as a major impediment. Other factors are the contractors’ profiteering, community belief systems that restrict employing women as site labour and client’s drive to evade additional cost associated with implementing social factors. The study recommends advocacy by pressure groups for legislation to amend and update the Procurement Act to capture social factors. This will develop and integrate the social agenda alongside existing procurement objectives, for implementation, in Nigeria, and internationally.
Identifying pulsation modes from two-passband photometry
Creators: name: Daszynska-Daszkiewicz, Jadwiga
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I discuss a prospect for mode identification from two-passband photometry of forthcoming BRITE space mission. Examples of photometric diagnostic diagrams are shown for three types of main sequence pulsating variables: $β$ Cephei, Slowly Pulsating B-type and $δ$ Scuti stars. I consider also taking into account the radial velocity data from simultaneous spectroscopy, which can be carried out from the ground. With such observations, much better discrimination of the spherical harmonic degree, $\ell$, can be accomplished and more constraints on stellar parameters and input physics can be derived.
description: 14 pages, 9 figures, to appear in Communication in Asteroseismology, proceedings of the BRITE Workshop, 22-23 May 2007, Vienna
First-order flow equations for extremal black holes in very special geometry
Creators: name: Cardoso, Gabriel Lopes
name: Ceresole, Anna
name: Dall'Agata, Gianguido
name: Oberreuter, Johannes M.
name: Perz, Jan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct interpolating solutions describing single-center static extremal non-supersymmetric black holes in four-dimensional N=2 supergravity theories with cubic prepotentials. To this end, we derive and solve first-order flow equations for rotating electrically charged extremal black holes in a Taub-NUT geometry in five dimensions. We then use the connection between five- and four-dimensional extremal black holes to obtain four-dimensional flow equations and we give the corresponding solutions.
description: 21 pages. v2: Summary section added
A sub-Earth-mass planet orbiting Barnard's star
Creators: name: Hernandez, J. I. Gonzalez
name: Mascareno, A. Suarez
name: Silva, A. M.
name: Stefanov, A. K.
name: Faria, J. P.
name: Tabernero, H. M.
name: Sozzetti, A.
name: Rebolo, R.
name: Pepe, F.
name: Santos, N. C.
name: Cristiani, S.
name: Lovis, C.
name: Dumusque, X.
name: Figueira, P.
name: Lillo-Box, J.
name: Nari, N.
name: Benatti, S.
name: Hobson, M. J.
name: Castro-Gonz'alez, A.
name: Allart, R.
name: Passegger, V. M.
name: Osorio, M. -R. Zapatero
name: Adibekyan, V.
name: Alibert, Y.
name: Prieto, C. Allende
name: Bouchy, F.
name: Damasso, M.
name: D'Odorico, V.
name: Di Marcantonio, P.
name: Ehrenreich, D.
name: Curto, G. Lo
name: Santos, R. G'enova
name: Martins, C. J. A. P.
name: Mehner, A.
name: Micela, G.
name: Molaro, P.
name: Nunes, N.
name: Palle, E.
name: Sousa, S. G.
name: Udry, S.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Barnard's star is a primary target within the ESPRESSO guaranteed time observations (GTO) as it is the second closest neighbour to our Sun after the $α$ Centauri stellar system. We present here a large set of 156 ESPRESSO observations of Barnard's star carried out over four years with the goal of exploring periods of shorter than 50 days, thus including the habitable zone (HZ). Our analysis of ESPRESSO data using Gaussian process (GP) to model stellar activity suggests a long-term activity cycle at 3200d and confirms stellar activity due to rotation at 140d as the dominant source of radial velocity (RV) variations. These results are in agreement with findings based on publicly available HARPS, HARPS-N, and CARMENES data. ESPRESSO RVs do not support the existence of the previously reported candidate planet at 233d. After subtracting the GP model, ESPRESSO RVs reveal several short-period candidate planet signals at periods of 3.15d, 4.12d, 2.34d, and 6.74d. We confirm the 3.15d signal as a sub-Earth mass planet, with a semi-amplitude of $55 \pm 7$cm/s, leading to a planet minimum mass $m_p \sin i$ of $0.37 \pm 0.05$Mearth, which is about three times the mass of Mars. ESPRESSO RVs suggest the possible existence of a candidate system with four sub-Earth mass planets in circular orbits with semi-amplitudes from 20 to 47cm/s, thus corresponding to minimum masses in the range of 0.17-0.32Mearth. The sub-Earth mass planet at $3.1533 \pm 0.0006$d is in a close-to circular orbit with a semi-major axis of $0.0229 \pm 0.0003$AU, thus located inwards from the HZ of Barnard's star, with an equilibrium temperature of 400K. Additional ESPRESSO observations would be required to confirm that the other three candidate signals originate from a compact short-period planet system orbiting Barnard's star inwards from its HZ.
description: Accepted for publication in Astronomy and Astrophysics
Rapid Modification of Neutron Star Surface Magnetic Field: A proposed mechanism for explaining Radio Emission State Changes in Pulsars
Creators: name: Geppert, U.
name: Basu, R.
name: Mitra, D.
name: Melikidze, G.
name: Szkudlarek, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The radio emission in many pulsars show sudden changes, usually within a period, that cannot be related to the steady state processes within the inner acceleration region (IAR) above the polar cap. These changes are often quasi-periodic in nature, where regular transitions between two or more stable emission states are seen. The durations of these states show a wide variety ranging from several seconds to hours at a time. There are strong, small scale magnetic field structures and huge temperature gradients present at the polar cap surface. We have considered several processes that can cause temporal modifications of the local magnetic field structure and strength at the surface of the polar cap. Using different magnetic field strengths and scales, and also assuming realistic scales of the temperature gradients, the evolutionary timescales of different phenomena affecting the surface magnetic field was estimated. We find that the Hall drift results in faster changes in comparison to both Ohmic decay and thermoelectric effects. A mechanism based on the Partially Screened Gap (PSG) model of the IAR has been proposed, where the Hall and thermoelectric oscillations perturb the polar cap magnetic field to alter the sparking process in the PSG. This is likely to affect the observed radio emission resulting in the observed state changes.
description: Accepted for publication in MNRAS
Ralph Schattkowsky u.a., Kirche und Nation. Westpreußen, Galizien und die Bukowina zwischen Völkerfrühling und Erstem Weltkrieg
Creators: name: Hein-Kircher, Heidi
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2014

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 63 Nr. 4 (2014)
Laser ablation loading of a surface-electrode ion trap
Creators: name: Leibrandt, David R.
name: Clark, Robert J.
name: Labaziewicz, Jaroslaw
name: Antohi, Paul
name: Bakr, Waseem
name: Brown, Kenneth R.
name: Chuang, Isaac L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate loading by laser ablation of $^{88}$Sr$^+$ ions into a mm-scale surface-electrode ion trap. The laser used for ablation is a pulsed, frequency-tripled Nd:YAG with pulse energies of 1-10 mJ and durations of 3-5 ns. An additional laser is not required to photoionize the ablated material. The efficiency and lifetime of several candidate materials for the laser ablation target are characterized by measuring the trapped ion fluorescence signal for a number of consecutive loads. Additionally, laser ablation is used to load traps with a trap depth (40 meV) below where electron impact ionization loading is typically successful ($\gtrsim$ 500 meV).
description: 4 pages, 4 figures
Extraction of instantaneous frequencies and amplitudes in nonstationary time-series data
Creators: name: Shea, Daniel E.
name: Giridharagopal, Rajiv
name: Ginger, David S.
name: Brunton, Steven L.
name: Kutz, J. Nathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Time-series analysis is critical for a diversity of applications in science and engineering. By leveraging the strengths of modern gradient descent algorithms, the Fourier transform, multi-resolution analysis, and Bayesian spectral analysis, we propose a data-driven approach to time-frequency analysis that circumvents many of the shortcomings of classic approaches, including the extraction of nonstationary signals with discontinuities in their behavior. The method introduced is equivalent to a {\em nonstationary Fourier mode decomposition} (NFMD) for nonstationary and nonlinear temporal signals, allowing for the accurate identification of instantaneous frequencies and their amplitudes. The method is demonstrated on a diversity of time-series data, including on data from cantilever-based electrostatic force microscopy to quantify the time-dependent evolution of charging dynamics at the nanoscale.
On the unitarization of linear representations of primitive partially ordered sets
Creators: name: Grushevoy, Roman
name: Yusenko, Kostyantyn
Publisher: name: arXiv
Year: 2008
Subjects: subject: Representation Theory (math.RT)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 65N30, 65N15

description: We describe all weights which are appropriated for the unitarization of linear representations of primitive partially ordered sets of finite type.
L'"Officina" dei letterati ferraresi negli studi di Antonia Tissoni Benvenuti
Creators: name: Montagnani, Cristina
Publisher: name: Annali Online  Lettere - Ferrara
Year: 2014

description: The article traces the participation of Antonia Tissoni Benvenuti, mainly regarding the Estense culture. It clearly emerges how the researcher has contributed to changing Italian literature of the XV century that, in the last years, has abandoned the traditional florentine-centered definition to evolve into a vaster perspective, finally in line with the indications offered by Carlo Dionisotti in Geografia e storia della letteratura italiana
description: Annali Online  Lettere - Ferrara, VIII 2 (2013)
Book of Abstracts: International Conference InterGedi2021
Creators: name: Plo, Ramón
name: Corona, Isabel
name: Pascual, Daniel
Publisher: name: Zenodo
Year: 2021
Subjects: Scientific dissemination, vulgarization of science, writers' visibility, digital discourse

description: Communication of research and dissemination of knowledge is changing and expanding –possibly faster than ever– towards international and digital environments. The increasing demands of this highly competitive scenario situate researchers and their work in a new global, multimodal dimension, where a number of emerging trends can be perceived. Thus, in this glocalized context, the emphasis is laid on: ● international collaboration, leading to a growing participatory culture, but also fostering each scholar’s individual role and the need to forge their personal and professional identities; ● a movement towards open science with demands for greater transparency of processes and availability of tools and resources. In this area, the use of social media and multimodal communication has brought about an unprecedented visibility of the researcher and a wider dissemination of results but also the appearance of challenges in the traditional copyright or peer-review systems; ● the reformulation/reconceptualization of scientific research through popularization practices, aimed at a more heterogeneous audience, but often coexisting with the rapid dissemination of vulgarized science or non-validated knowledge through the same channels. Increasingly, scholars and researchers must acquire and maximize developing professional and discursive practices in relation to these emerging forms of digital communication. This process generally involves a number of adaptations, such as a more active and personal role of the researchers in the process of communication of results, their current aim to reach multiple audiences and the need to master the genres, uses and conventions associated with specific platforms and online environments. The InterGedi2021 Conference would like to trace and analyse these trends related to the digital communication of science and explore their areas of confluence. More specifically, it is our aim to gather current research on the practices related to the construction of digital identity and visibility, the emerging conflicts related to the public availability and appropriation of scientific culture and the ways of validating and disseminating scientific knowledge in this new context.
Plasmonically assisted channels of photoemission from metals
Creators: name: Novko, Dino
name: Despoja, Vito
name: Reutzel, Marcel
name: Li, Andi
name: Petek, Hrvoje
name: Gumhalter, Branko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We analyse recently measured nonlinear photoemission spectra from Ag surfaces that reveal resonances whose energies do not scale with the applied photon energy but stay pinned to multiples of bulk plasmon energy $\hbarω_p$ above the Fermi level. To elucidate these unexpected and peculiar features we investigate the spectra of plasmons generated in a solid by the optically pumped electronic polarization and their effect on photoemission. By combining quadratic response formalism for calculations of photoemission yield, a nonperturbative approach to inelastic electron scattering, and first-principles calculations for the electronic structure, we demonstrate the dependence of probability amplitude for single- and multiplasmon excitations on the basic parameters characterizing the photon pulse and the system. The resulting multiexcitation spectrum evolves towards a truncated plasmonic coherent state. Analogous concept is extrapolated to interpret plasmon generation by multiphoton excited electronic polarization. Based on this we elaborate a scenario that the thus created real plasmons act as supplementary frequency-locked pump field for non-Einsteinian plasmonically assisted channels of photoemission from metals. The established paradigm enables assignment and assessment of the observed linear $\hbarω_p$- and nonlinear $2\hbarω_p$-electron yields from Ag. Such effects may be exploited for selective filtering of optical energy conversion in electronic systems.
description: Article as accepted for publication in Physical Review B
Use of the fluorescent probe 1-N-phenyl napthylamine to study the interactions of aminoglycoside antibiotics with the outer membrane of Pseudomonas aeruginosa
Creators: name: Loh, Bernadette Anne
Publisher: name: University of British Columbia
Year: 2010

description: The mode of interaction of the polycationic aminoglycoside antibiotics with the surface of Pseudomonas aeruginosa cells was studied using the hydrophobic fluorescent probe 1-N-phenyl napthylamine (NPN). Addition of the aminoglycoside gentamicin to intact cells in the presence of NPN led to a shift in the fluorescence emission maximum from 460 to 420 nm. At the same time the NPN fluorescence intensity increased four fold. Gentamicin caused no such effects when added to outer membrane vesicles suggesting that the increased fluorescence resulted from the interaction of gentamicin with intact cells. Gentamicin-promoted NPN uptake was inhibited by the divalent cations Mg²⁺ and Ca²⁺ , but occurred in the absence of gentamicin transport across the inner membrane. Low concentrations of gentamicin (2 μg/ml) caused NPN fluorescence to increase over a period of 4 minutes in a sigmoidal fashion. At higher concentrations (50 μg/ml) the increase occurred within a few seconds. The final fluorescence intensity was almost independent of the gentamicin concentration. A centrifugation technique was used to demonstrate that gentamicin caused actual uptake of NPN from the supernatant. The initial rate of NPN uptake varied according to the gentamicin concentration in a sigmoidal fashion. Similar data were obtained for seven other aminoglycoside antibiotics. The data when reanalysed as a Hill-plot gave a series of lines with a mean slope (the Hill number) of 2.26 ± 0.26, suggesting that the interaction of aminoglycosides with the cell surface to permeabilize it to NPN involved at least 3 sites and demonstrated positive cooperativity. There was a statistically significant relationship between the pseudo-association constant K[sub s] from the Hill plots and the minimal inhibitory concentrations for the 8 antibiotics These results are consistent with the concept that aminoglycosides interact at a divalent cation binding site on the P. aeruginosa outer membrane and permeabilize it to the hydrophobic probe NPN.
Eigenvalue Decomposition as a Generalized Synchronization Cluster Analysis
Creators: name: Allefeld, Carsten
name: Müller, Markus
name: Kurths, Jürgen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Motivated by the recent demonstration of its use as a tool for the detection and characterization of phase-shape correlations in multivariate time series, we show that eigenvalue decomposition can also be applied to a matrix of indices of bivariate phase synchronization strength. The resulting method is able to identify clusters of synchronized oscillators, and to quantify their strength as well as the degree of involvement of an oscillator in a cluster. Since for the case of a single cluster the method gives similar results as our previous approach, it can be seen as a generalized Synchronization Cluster Analysis, extending its field of application to more complex situations. The performance of the method is tested by applying it to simulation data.
description: Submitted Oct 2005, accepted Jan 2006, "published" Oct 2007, actually available Jan 2008
Efficiency, Equity and Equality in Health and Healthcare
Creators: name: Culyer, Anthony
Publisher: name: F1000 Research Limited
Year: 2019

description: Three common “Es” have high ethical and political content for health policy: efficiency, equity and equality. This article examines the links between the three, with especial attention given to (a) the claimed conflict between efficiency and equity, (b) the equity of inequalities and (c) the conflict between six equity principles: equal health, equal health gain, equal value of additional health, maintaining existing distributions, allocation according to need and equal per capita resources.
Discrete Koenigs nets and discrete isothermic surfaces
Creators: name: Bobenko, Alexander I.
name: Suris, Yuri B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53A20, 53A05 (Primary); 51B10, 52C35 (Secondary)

description: We discuss discretization of Koenigs nets (conjugate nets with equal Laplace invariants) and of isothermic surfaces. Our discretization is based on the notion of dual quadrilaterals: two planar quadrilaterals are called dual, if their corresponding sides are parallel, and their non-corresponding diagonals are parallel. Discrete Koenigs nets are defined as nets with planar quadrilaterals admitting dual nets. Several novel geometric properties of discrete Koenigs nets are found; in particular, two-dimensional discrete Koenigs nets can be characterized by co-planarity of the intersection points of diagonals of elementary quadrilaterals adjacent to any vertex; this characterization is invariant with respect to projective transformations. Discrete isothermic nets are defined as circular Koenigs nets. This is a new geometric characterization of discrete isothermic surfaces introduced previously as circular nets with factorized cross-ratios.
description: 30 pages, 11 figures
Aggressive Visual Perching with Quadrotors on Inclined Surfaces
Creators: name: Mao, Jeffrey
name: Li, Guanrui
name: Nogar, Stephen
name: Kroninger, Christopher
name: Loianno, Giuseppe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Autonomous Micro Aerial Vehicles (MAVs) have the potential to be employed for surveillance and monitoring tasks. By perching and staring on one or multiple locations aerial robots can save energy while concurrently increasing their overall mission time without actively flying. In this paper, we address the estimation, planning, and control problems for autonomous perching on inclined surfaces with small quadrotors using visual and inertial sensing. We focus on planning and executing of dynamically feasible trajectories to navigate and perch to a desired target location with on board sensing and computation. Our planner also supports certain classes of nonlinear global constraints by leveraging an efficient algorithm that we have mathematically verified. The on board cameras and IMU are concurrently used for state estimation and to infer the relative robot/target localization. The proposed solution runs in real-time on board a limited computational unit. Experimental results validate the proposed approach by tackling aggressive perching maneuvers with flight envelopes that include large excursions from the hover position on inclined surfaces up to 90$^\circ$, angular rates up to 600~deg/s, and accelerations up to 10m/s^2.
description: Compressed Explanation and edited typos to be aligned with the final Conference Version
Antony Polonsky, The Jews in Poland and Russia Bd. 3
Creators: name: Hein-Kircher, Heidi
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2013

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 62 Nr. 2 (2013): Nationalisierung und Pragmatismus. Staatliche Institutionen und Minderheiten in Polen 1918-1939
Representations of Language Varieties Are Reliable Given Corpus Similarity Measures
Creators: name: Dunn, Jonathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: This paper measures similarity both within and between 84 language varieties across nine languages. These corpora are drawn from digital sources (the web and tweets), allowing us to evaluate whether such geo-referenced corpora are reliable for modelling linguistic variation. The basic idea is that, if each source adequately represents a single underlying language variety, then the similarity between these sources should be stable across all languages and countries. The paper shows that there is a consistent agreement between these sources using frequency-based corpus similarity measures. This provides further evidence that digital geo-referenced corpora consistently represent local language varieties.
Funktionale Ähnlichkeiten und Unterschiede der Erinnerungskulturen an der Wende vom 19. zum 20. Jahrhundert in Städten an der Peripherie und im Zentrum
Creators: name: Safronovas, Vasilijus
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2014

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 63 Nr. 2 (2014)