cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Topological sectors, dimer correlations and monomers from the transfer-matrix solution of the dimer model
Creators: name: Wilkins, Neil
name: Powell, Stephen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We solve the classical square-lattice dimer model with periodic boundaries and in the presence of a field $\boldsymbol{t}$ that couples to the (vector) flux, by diagonalizing a modified version of Lieb's transfer matrix. After deriving the torus partition function in the thermodynamic limit, we show how the configuration space divides into 'topological sectors' corresponding to distinct values of the flux. Additionally, we demonstrate in general that expectation values are $\boldsymbol{t}$-independent at leading order, and obtain explicit expressions for dimer occupation numbers, dimer-dimer correlation functions and the monomer distribution function. The last of these is expressed as a Toeplitz determinant, whose asymptotic behavior for large monomer separation is tractable using the Fisher-Hartwig conjecture. Our results reproduce those previously obtained using Pfaffian techniques.
description: 16 pages, 4 figures, 1 table
Assessing the Magnitude of Non-Consent Biases in Linked Survey and Administrative Data
Creators: name: Sakshaug, Joseph W.
name: Kreuter, Frauke
Publisher: name: European Survey Research Association
Year: 2012
Subjects: administrative data linkage; non-consent bias; nonresponse; measurement error; data quality; record-linkage

description: Administrative records are increasingly being linked to survey records to highten the utility of the survey data. Respondent consent is usually needed to perform exact record linkage; however, not all respondents agree to this request and several studies have found significant differences between consenting and non-consenting respondents on the survey variables. To the extent that these survey variables are related to variables in the administrative data, the resulting administrative estimates can be biased due to non-consent. Estimating non-consent biases for linked administrative estimates is complicated by the fact that administrative records are typically not available for the non-consenting respondents. The present study can overcome this limitation by utilizing a unique data source, the German Panel Study "Labour Market and Social Security" (PASS), and linking the consent indicator to the administrative records (available for the entire sample). This situation permits the estimation of non-consent biases for administrative variables and avoids the need to link the survey responses. The impact of non-consent bias can be assessed relative to other sources of bias (nonresponse, measurement) for several administrative estimates. The results show that non-consent biases are present for few estimates, but are generally small relative to other sources of bias.
description: Survey Research Methods, Vol 6, No 2 (2012)
Multivariate Boundaries of a Self Representing Stratum of Large Units in Agricultural Survey Design
Creators: name: Benedetti, Roberto
name: Piersimoni, Federica
Publisher: name: European Survey Research Association
Year: 2012
Subjects: skewed population distribution; sample design; sample allocation; stratification; combinatorial optimization; simulated annealing

description: In business surveys in general, and in multipurpose agricultural surveys in particular, the problem of designing a sample from a list frame usually consists of two different aspects. The first is concerned with the choice of a rule for stratifying the population when several size variables are available and the second is devoted to sample size determination and sample allocation to a given set of strata. The main property that is required of the sample design is that it delivers a specified level of precision for a set of variables of interest using as few sampling units as possible. This article examines how this can be achieved via a basic partition into two strata, one completely enumerated and the other sampled, defined in such a way  as to achieve both these objectives.
The procedure was used to design the Italian Milk Products Monthly Survey on the basis of a set of auxiliary variables obtained from an annual census of the same target population. Given the combinatorial optimization nature of the problem, we use stochastic relaxation theory, and in particular, we use simulated annealing because of its flexibility. Our results indicate that in this situation the multivariate partition obtained by using this random search strategy is a suitable solution as it permits identification of boundaries of any shape. Furthermore, numerical comparisons between sampling designs obtained by using these procedures and some simple extensions of univariate stratification rules are made. The gain from using the proposed strategy is nontrivial as it achieves the required precision using a sample size that is notably smaller than that required by simple extensions to univariate stratification rules.
description: Survey Research Methods, Vol 6, No 3 (2012): Special Issue: Papers from ITACOSM11
Heavy Flavour Hadro-Production from Fixed-Target to Collider Energies
Creators: name: Lourenco, C.
name: Wohri, H. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We review the hadro-production data presently available on open charm and beauty absolute production cross-sections, collected by experiments at CERN, DESY and Fermilab. The published charm production cross-section values are updated, in particular for the "time evolution" of the branching ratios. These measurements are compared to LO pQCD calculations, as a function of the collision energy, using recent parametrisations of the parton distribution functions. We then estimate, including nuclear effects of the parton densities, the charm and beauty production cross-sections relevant for measurements at SPS and RHIC energies, in proton-proton, proton-nucleus and nucleus-nucleus collisions. The calculations are also compared with measurements of single D and B kinematical distributions, and DDbar pair correlations. We finish with two brief comments, concerning the importance of beauty production as a feed-down source of J/psi production, and open charm measurements performed using leptonic decays.
description: 72 pages
Gravitational lensing in 4-D Einstein-Gauss-Bonnet gravity in the presence of plasma
Creators: name: Babar, Gulmina Zaman
name: Atamurotov, Farruh
name: Babar, Abdullah Zaman
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we have assumed a weak-field regime to explore the gravitational lensed photons in a 4 dimensional Einstein-Gauss-Bonnet gravity, which is very much in the limelight these days. The investigation is conducted in three distinct paradigms: uniform plasma, singular isothermal sphere and a non-singular isothermal sphere. The lensing angle associated with the distribution factor of the medium is individually derived for each case and further utilized to study the magnification of the image source brightness, selectively for the uniform plasma and singular isothermal sphere. The attained results are brought forth in contrast with the standard Schwarzschild geometry
description: 10 pages, 13 figures
Handling Nonresponse in Business Surveys
Creators: name: Borgoni, Riccardo
name: Marasini, Donata
name: Quatto, Piero
Publisher: name: European Survey Research Association
Year: 2012
Subjects: regression estimator; nonresponse weighting adjustment; trimming; bootstrap; business surveys

description: Business surveys are a valuable indication of the current and the future economic situation. However refusals are very common in this context and may induce bias in the estimates of interest. In this paper the problem of adjusting for nonresponse estimators of relevant economic outcomes is considered. Using a large simulation study, we investigate how weighting adjusted procedures are influenced by the specification of the response model utilised in calculation of the weights. We consider, in particular, how trimming the weights can have an impact on the final estimates and we propose a bootstrap-based procedure to determine an optimal trimming threshold. We illustrate the procedure using a 2009 survey of a large population of Italian firms.
description: Survey Research Methods, Vol 6, No 3 (2012): Special Issue: Papers from ITACOSM11
Deep Learning with robustness to missing data: A novel approach to the detection of COVID-19
Creators: name: Çallı, Erdi
name: Murphy, Keelin
name: Kurstjens, Steef
name: Samson, Tijs
name: Herpers, Robert
name: Smits, Henk
name: Rutten, Matthieu
name: van Ginneken, Bram
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In the context of the current global pandemic and the limitations of the RT-PCR test, we propose a novel deep learning architecture, DFCN (Denoising Fully Connected Network). Since medical facilities around the world differ enormously in what laboratory tests or chest imaging may be available, DFCN is designed to be robust to missing input data. An ablation study extensively evaluates the performance benefits of the DFCN as well as its robustness to missing inputs. Data from 1088 patients with confirmed RT-PCR results are obtained from two independent medical facilities. The data includes results from 27 laboratory tests and a chest x-ray scored by a deep learning model. Training and test datasets are taken from different medical facilities. Data is made publicly available. The performance of DFCN in predicting the RT-PCR result is compared with 3 related architectures as well as a Random Forest baseline. All models are trained with varying levels of masked input data to encourage robustness to missing inputs. Missing data is simulated at test time by masking inputs randomly. DFCN outperforms all other models with statistical significance using random subsets of input data with 2-27 available inputs. When all 28 inputs are available DFCN obtains an AUC of 0.924, higher than any other model. Furthermore, with clinically meaningful subsets of parameters consisting of just 6 and 7 inputs respectively, DFCN achieves higher AUCs than any other model, with values of 0.909 and 0.919.
Solar-like oscillations in the G2 subgiant beta Hydri from dual-site observations
Creators: name: Bedding, Timothy R.
name: Kjeldsen, Hans
name: Arentoft, Torben
name: Bouchy, Francois
name: Brandbyge, Jacob
name: Brewer, Brendon J.
name: Butler, R. Paul
name: Christensen-Dalsgaard, Joergen
name: Dall, Thomas
name: Frandsen, Soeren
name: Karoff, Christoffer
name: Kiss, Laszlo L.
name: Monteiro, Mario J. P. F. G.
name: Pijpers, Frank P.
name: Teixeira, Teresa C.
name: Tinney, C. G.
name: Baldry, Ivan K.
name: Carrier, Fabien
name: O'Toole, Simon J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have observed oscillations in the nearby G2 subgiant star beta Hyi using high-precision velocity observations obtained over more than a week with the HARPS and UCLES spectrographs. The oscillation frequencies show a regular comb structure, as expected for solar-like oscillations, but with several l=1 modes being strongly affected by avoided crossings. The data, combined with those we obtained five years earlier, allow us to identify 28 oscillation modes. By scaling the large frequency separation from the Sun, we measure the mean density of beta Hyi to an accuracy of 0.6%. The amplitudes of the oscillations are about 2.5 times solar and the mode lifetime is 2.3 d. A detailed comparison of the mixed l=1 modes with theoretical models should allow a precise estimate of the age of the star.
description: 13 pages, 14 figures, accepted by ApJ. Fixed minor typo (ref to Fig 14)
Dirichlet Baths and the Not-so-Fine-Grained Page Curve
Creators: name: Ghosh, Kausik
name: Krishnan, Chethan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a doubly holographic prescription for computing entanglement entropy on a gravitating brane. It involves a Ryu-Takayanagi surface with a Dirichlet anchoring condition. In braneworld cosmology, a related approach was used previously in arXiv:2007.06551. There, the prescription naturally computed a co-moving entanglement entropy, and was argued to resolve the information paradox for a black hole living in the cosmology. In this paper, we show that the Dirichlet prescription leads to reasonable results, when applied to a recently studied wedge holography set up with a gravitating bath. The nature of the information paradox and its resolution in our Dirichlet problem have a natural understanding in terms of the strength of gravity on the two branes and at the anchoring location. By sliding the anchor to the defect, we demonstrate that the limit where gravity decouples from the anchor is continuous -- in other words, as far as island physics is considered, weak gravity on the anchor is identical to no gravity. The weak and (moderately) strong gravity regions on the brane are separated by a "Dirichlet wall". We find an intricate interplay between various extremal surfaces, with an island coming to the rescue whenever there is an information paradox. This is despite the presence of massless gravitons in the spectrum. The overall physics is consistent with the slogan that gravity becomes "more holographic", as it gets stronger. Our observations strengthen the case that the conventional Page curve is indeed of significance, when discussing the information paradox in flat space. We work in high enough dimensions so that the graviton is non-trivial, and our results are in line with the previous discussions on gravitating baths in arXiv:2005.02993 and arXiv:2007.06551.
description: v2: more discussions, references, JHEP version (+ minor improvements). 25pp
The University of Shadows (front matter, including the Artist's Statement).
Creators: name: Bordalejo, Barbara
Publisher: name: Zenodo
Year: 2019
Subjects: Urban Fantasy
Fantasy
Genre theory

description: This is the front matter and bibliography of my 2019 MFA thesis. The "Artist's Statement" defines The University of Shadow's genre as urban fantasy and presents a theoretical approach in relation to other texts and genres.
Robust Lavallee-Hidiroglou stratified sampling strategy
Creators: name: Bramati, Maria Caterina
Publisher: name: European Survey Research Association
Year: 2012
Subjects: robust regression; stratified design; auxiliary data

description: There are several reasons why robust regression techniques are useful tools in sampling design. First of all, when stratified samples are considered, one needs to deal with three main issues: the sample size, the strata bounds determination and the sample allocation in the strata.  Since the target variable Y, the objective of the survey, is unknown, some auxiliary information X known for the entire population from which the sample is drawn, is used. Such information is helpful as it is typically strongly correlated with the target Y. However, some discrepancies between these variables may arise. The use of auxiliary information, combined with the choice of the appropriate statistical model to estimate the relationship between Y and X, is crucial for the determination of the strata bounds, the size of the sample and the sampling rates according to a chosen precision level for the estimates, as has been shown by Rivest (2002). Nevertheless, this regression-based approach is highly sensitive to the presence of contaminated data. Since the key tool for stratified sampling is the measure of scale of Y conditional on the knowledge of the auxiliary X, a robust approach based on the S-estimator of the regression is proposed in this paper. The aim is to allow for robust sample size and strata bounds determination, together with optimal sample allocation. Simulation results based on data from the Construction sector of a Structural Business Survey illustrate the advantages of the proposed method.
description: Survey Research Methods, Vol 6, No 3 (2012): Special Issue: Papers from ITACOSM11
The host galaxies of long-duration GRBs in a cosmological hierarchical scenario
Creators: name: Nuza, S. E.
name: Tissera, P. B.
name: Pellizza, L. J.
name: Lambas, D. G.
name: Scannapieco, C.
name: De Rossi, M. E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We developed a Monte Carlo code to generate long-duration gamma ray burst (LGRB) events within cosmological hydrodynamical simulations consistent with the concordance model. As structure is assembled, LGRBs are generated in the substructure that formed galaxies today. We adopted the collapsar model so that LGRBs are produced by single, massive stars at the final stage of their evolution. We found that the observed properties of the LGRB host galaxies (HGs) are reproduced if LGRBs are also required to be generated by low metallicity stars. The low metallicity condition imposed on the progenitor stars of LGRBs selects a sample of HGs with mean gas abundances of 12 + log O/H \~ 8.6. For z<1 the simulated HGs of low metallicity LGRB progenitors tend to be faint, slow rotators with high star formation efficiency, compared with the general galaxy population, in agreement with observations. At higher redshift, our results suggest that larger systems with high star formation activity could also contribute to the generation of LGRBs from low metallicity progenitors since the fraction of low metallicity gas available for star formation increases for all systems with look-back time. Under the hypothesis of our LGRB model, our results support the claim that LGRBs could be unbiased tracers of star formation at high redshifts.
description: Final revised version with minor changes. 9 pages, 9 figures, mn2e.cls. To appear in MNRAS
Robust Small Area Estimation and Oversampling in the Estimation of Poverty Indicators
Creators: name: Giusti, Caterina
name: Marchetti, Stefano
name: Pratesi, Monica
name: Salvati, Nicola
Publisher: name: European Survey Research Association
Year: 2012
Subjects: poverty mapping; oversample; M-quantile models

description: There has been rising interest in research on poverty mapping over the last decade, with the European Union proposing a core of statistical indicators on poverty commonly known as Laeken Indicators. They include the incidence and the intensity of poverty for a set of domains (e.g. young people, unemployed people). The EU-SILC (European Union - Statistics on Income and Living Conditions) survey represents the most important source of information to estimate these poverty indicators at national or regional level (NUTS 1-2 level). However, local policy makers also require statistics on poverty and living conditions at lower geographical/domain levels, but estimating poverty indicators directly from EU-SILC for these domains often leads to inaccurate estimates. To overcome this problem there are two main strategies: i. increasing the sample size of EU-SILC so that direct estimates become reliable and ii. resort to small area estimation techniques. In this paper we compare these two alternatives: with the availability of an oversampling of the EU-SILC survey for the province of Pisa, obtained as a side result of the SAMPLE project (Small Area Methods for Poverty and Living Conditions, http://www.sample-project.eu/), we can compute reliable direct estimates that can be compared to small area estimates computed under the M-quantile approach. Results show that the M-quantile small area estimates are comparable in terms of efficiency and precision to direct estimates using oversample data. Moreover, considering the oversample estimates as a benchmark, we show how direct estimates computed without the oversample have larger errors as well as larger estimated mean squared errors than corresponding M-quantile estimates.
description: Survey Research Methods, Vol 6, No 3 (2012): Special Issue: Papers from ITACOSM11
Editorial Introduction
Creators: name: Chambers, Ray
Publisher: name: European Survey Research Association
Year: 2012
Subjects: survey design; sampling; nonresponse; imputation

description: This issue of Survey Research Methods contains four papers that were presented at the ITACOSM11 conference held in Pisa, Italy, June 27-29, 2011. The four papers published here represent a good cross-section of current Italian research on sample survey design and estimation. They describe new methodologies for survey design based on multivariate auxiliary information, using imputation to account for survey nonresponse, semiparametric methods for small area estimation and outlier robust survey design.
description: Survey Research Methods, Vol 6, No 3 (2012): Special Issue: Papers from ITACOSM11
Narration of "Pingu Gets a Stomachache"
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Newbold, Lindsey
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: hup

description: Audio file VP-230308-06: Narration of the animated video "Pingu Gets a Stomachache" (a.k.a. "Sore Tummy Pingu," episode 141 of the animated of Pingu, a television series created by Otmar Gutmann). Verdena narrates in Hupa twice, once while watching the video, then immediately after watching it, followed by an English translation.
The Effect of Interviewer Experience, Attitudes, Personality and Skills on Respondent Co-operation with Face-to-Face Surveys
Creators: name: Jäckle, Annette
name: Lynn, Peter
name: Sinibaldi, Jennifer
name: Tipping, Sarah
Publisher: name: European Survey Research Association
Year: 2012
Subjects: nonresponse; interviewer survey; Big 5 personality traits

description: This paper examines the role of interviewers' experience, attitudes, personality traits and inter-personal skills in determining survey co-operation, conditional on contact. We take the perspective that these characteristics influence interviewers' behaviour and hence influence the doorstep interaction between interviewer and sample member. Previous studies of the association between doorstep behaviour and co-operation have not directly addressed the role of personality traits and inter-personal skills and most have been based on small samples of interviewers. We use a large sample of 842 face-to-face interviewers working for a major survey institute and analyse co-operation outcomes for over 100,000 cases contacted by those interviewers over a 13-month period. We find evidence of effects of experience, attitudes, personality traits and inter-personal skills on co-operation rates. Several of the effects of attitudes and inter-personal skills are explained by differences in experience, though some independent effects remain. The role of attitudes, personality and skills seems to be greatest for the least experienced interviewers.
description: Survey Research Methods, Vol 7, No 1 (2013)
Η ηθολογία των μετακινούμενων αιγοπροβάτων
Creators: name: Καραΐσκου, Χριστίνα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Ηθολογία / Ευζωία
Πρόβατα / Αίγες
Μετακινούμενη Κτηνοτροφία
Animal behavior/ sheep behavior / goat behavior
Sheep transhumant / transhumant sheep and goat
Goat moving / Greece

description: Στόχος της παρούσας εργασίας ήταν η καταγραφή της ηθολογίας και η μελέτη της συμπεριφοράς των προβάτων και των αιγών κατά τη μετακίνηση στους βοσκοτόπους. Αρχικά δόθηκε έμφαση στην προσαρμοστικότητα των ζώων τόσο στο φυσικό περιβάλλον όσο και κατά τη μετακίνησή τους με φορτηγό όχημα. Τονίστηκαν οι έννοιες που αποσκοπούν στην καλή διαβίωση των ζώων, η σημασία της ευζωίας καθώς και το πώς το νευρικό σύστημα συνδέεται με την συμπεριφορά. Παρουσιάστηκαν οι παράγοντες που μπορούν να προκαλέσουν καταπόνηση κατά τη διάρκεια της μετακίνησης καθώς και πως συνδέεται ο καρδιακός ρυθμός με τις συμπεριφορές που εκδηλώνουν τα αιγοπρόβατα από τα εξωγενή περιβαλλοντικά ερεθίσματα που δέχονται. Έγινε λόγος για τη μετακίνηση τόσο σε διεθνές επίπεδο όσο και στην Ελλάδα. Στο δεύτερο μέρος της εργασίας παρουσιάζεται το πειραματικό πρωτόκολλο που περιλαμβάνει τον ερευνητικό στόχο και τα υλικά και οι μέθοδοι που χρησιμοποιήθηκαν. Η παρούσα έρευνα βασίστηκε σε συνεντεύξεις μετακινούμενων κτηνοτρόφων, στην παρατήρηση ποιμνίου που μετακινήθηκε και στην λεπτομερή καταγραφή των απαντήσεων στα δομημένα ερωτηματολόγια από τους ερωτηθέντες. Δίνονται λεπτομερώς περιγραφές και παραδείγματα από συμπεριφορές που τα ίδια τα αιγοπρόβατα εκδήλωναν κατά τη διάρκεια της πορείας μετακίνησης (διάβας)
description: The aim of this work was to record ethology and study the behavior of sheep and goats when moving to mountainous pasture. At first, the adaptability of animals was emphasized both in the natural environment and in the transfer vehicles. The concepts of animal welfare, the importance of welfare and how the nervous system is linked to animal behavior are emphasized. There are also presented the factors that can cause anxiety during the movement and how the heart rate is associated with the behavioral patterns that exhibited by the sheep and goats caused by the external stimuli from the surrounded environment. It is also presented the National and International status of the migratory flocks. In the second part of the thesis is presented the experimental protocol including the scientific objective and the materials and methods used. The present study was based on interviews and questionnaire filling, on behavioral observations of the moved flocks, either on foot or by vehicles by the migratory breeders. It is also presented the day by day behavioral patterns of a moving flock on foot to the mountainous pastures
Electroabsorption in gated GaAs nanophotonic waveguides
Creators: name: Wang, Ying
name: Uppu, Ravitej
name: Zhou, Xiaoyan
name: Papon, Camille
name: Scholz, Sven
name: Wieck, Andreas D.
name: Ludwig, Arne
name: Lodahl, Peter
name: Midolo, Leonardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on the analysis of electroabsorption in thin GaAs/Al$_{0.3}$Ga$_{0.7}$As nanophotonic waveguides with an embedded $p$-$i$-$n$ junction. By measuring the transmission through waveguides of different lengths, we derive the propagation loss as a function of electric field, wavelength, and temperature. The results are in good agreement with the Franz-Keldysh model of electroabsorption extending over 200 meV below the GaAs bandgap, i.e. in the 910--970 nm wavelength range. We find a pronounced residual absorption in forward bias, which we attribute to Fermi-level pinning at the waveguide surface, producing over 20 dB/mm loss at room temperature. These results are essential for understanding the origin of loss in nanophotonic devices operating in the emission range of self-assembled InAs semiconductor quantum dots, towards the realization of scalable quantum photonic integrated circuits.
description: 6 pages, 3 figures
Remark on the minimal seesaw model and leptogenesis with tri/bi-maximal mixing
Creators: name: Kitabayashi, Teruyuki
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have studied a leptogenesis scenario in the framework of the minimal seesaw model with tri/bi-maximal mixing. Usually, at least one of the elements in the Dirac mass matrix is fixed to be zero, for example, we denote it by $b_2=0$. We have pointed out that the absolute value of the CP asymmetry has several minimums and maximums with non-zero $b_2$. Thus one can expect that more rich phenomena, such as an enhanced leptogenesis, are hidden in the $b_2 \neq 0$ space.
description: 9 pages, 7 figures, uses RevTex4. To appear in Physcal Review D
Low-Energy Thermal Photons from Meson-Meson Bremsstrahlung
Creators: name: Liu, W.
name: Rapp, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Within an effective hadronic model including electromagnetic interactions via a U$_{\rm em}$(1) gauge, we reinvestigate photon Bremsstrahlung from a hot hadronic gas as expected to be formed in relativistic heavy-ion collisions at SPS energies. We calculate photon emission from the reactions $ππ\toππγ$ and $πK \toπKγ$ by an explicit (numerical) evaluation of the multi-dimensional phase space integral. This, in particular, allows to avoid the commonly employed soft photon approximation (SPA), as well as to incorporate final-state thermal enhancement factors. % during the hadronic stage of the fireball. Both improvements are shown to result in an appreciable increase of the photon production rate over previous hadronic calculations. Upon convolution over a thermal fireball we find an improvement in the description of recent low transverse-momentum WA98 data at SPS. The influence of both Landau-Pomeranchuk-Migdal and in-medium effects on "$σ$" and $ρ$-meson exchanges are briefly discussed.
description: version to appear in Nucl. Phys. A
Tailored high-contrast attosecond electron pulses for coherent excitation and scattering
Creators: name: Yalunin, Sergey V.
name: Feist, Armin
name: Ropers, Claus
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Temporally shaping the density of electron beams using light forms the basis for a wide range of established and emerging technologies, including free-electron lasers and attosecond electron microscopy. The modulation depth of compressed electron pulses is a key figure of merit limiting applications. In this work, we present an approach for generating background-free attosecond electron pulse trains by sequential inelastic electron-light scattering. Harnessing quantum interference in the fractional Talbot effect, we suppress unwanted background density in electron compression by several orders of magnitude. Our results will greatly enhance applications of coherent electron-light scattering, such as stimulated cathodoluminescence and streaking.
Isolated neutron stars: Magnetic fields, distances, and spectra
Creators: name: van Kerkwijk, M. H.
name: Kaplan, D. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present timing measurements, astrometry, and high-resolution spectra of a number of nearby, thermally emitting, isolated neutron stars. We use these to infer magnetic field strengths and distances, but also encounter a number of puzzles. We discuss three specific ones in detail: (i) For RX J0720.4-3125 and RX J1308.6+2127, the characteristic ages are in excess of 1~Myr, while their temperatures and kinematic ages indicate that they are much younger; (ii) For RX J1856.5-3754, the brightness temperature for the optical emission is in excess of that measured at X-ray wavelengths for reasonable neutron-star radii; (iii) For RX J0720.4-3125, the spectrum changed from an initially featureless state to one with an absorption feature, yet there was only a relatively small change in effective temperature. Furthermore, we attempt to see whether the spectra of all seven sourced, in six of which absorption features have now been found, can be understood in the context of strongly magnetised hydrogen atmospheres. We find that the energies of the absorption features can be reproduced, but that the featureless spectra of some sources, especially the Wien-like high-energy tails, remain puzzling.
description: 10 pages, 7 figures, to appear Astrophysics and Space Science, in the proceedings of "Isolated Neutron Stars: from the Interior to the Surface", edited by D. Page, R. Turolla and S. Zane
Discussion of "The Origin of the Ch'idilye:"
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Newbold, Lindsey
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: hup

description: Audio files VP-230308-03, VP-230308-04, and VP-230308-05: Discussion of Minnie Reeves' story "The Origin of the Ch'idilye:," recorded by Victor Golla in the 1960s (California Language Archive, file LA119.012) with transcription published as conversation #8 in the volume "Hupa Stories, Anecdotes, and Conversations" (Hoopa Valley Tribe, 1984). Verdena comments on the text and gives some details about the version of the story that she knows (VP-230308-03). This leads to a discussion of differences between Verdena's dialect of Hupa and Redwood Creek dialects reflected in the text (VP-230308-04 and VP-230308-05).
Theoretical and Mass Spectrometric Studies of Low-valent Heavier Tetrel and Transition Metal-Tetrel Compounds
Creators: name: Maurer, Leonard Ruben
Publisher: name: Universitäts- und Landesbibliothek Bonn
Year: 2024
Subjects: subject: ddc:540

description: This thesis comprises different areas of theoretical and experimental inorganic molecular chemistry. The thesis is split into three main parts.
 After the most fundamental principles of computational chemistry are introduced, part A deals with theoretical studies carried out on low-valent silicon and germanium main group compounds. Innovative achievements by synthetically-working colleagues in our group were comprehensively studied by dispersion-corrected density functional theory (DFT) methods in the gas phase. Among the investigated molecules are the novel N-heterocyclic carbene (NHC) stabilized iminosilenylidenes (NHC)SiCNR, siladicarbenes Si(NHC)2 and siladiimides Si(NR)2, but also representatives of heavier ditetrelynes REE’R’ and ditetreleneylidenes RR’EE’ with E and E’ being silicon and/or germanium, supported by cyclic alkyl amino carbene ligands (CAACs). For the latter compounds, special attention is provided to the influence of the σ-donating and π-accepting CAAC ligands on the electronic structure in comparison to NHCs. Herein, the interpretation of both the canonical and localized molecular orbitals combined with the natural bond orbital (NBO) and natural resonance theory (NRT) methods proved to be insightful for the analysis of the wave function of the studied compounds.
 Part B features a similarly straightforward computational analysis of heavier tetrel transition metal compounds. On the one hand, these include the asymmetrically coordinated digermyne cobalt complex [CoCp(CO)(RGeGeR)] and its derivatives, such as the carbonyl-free C2v-symmetric digermacobaltirene heterocycle [CoCp(RGeGeR)] or the digerma-cobaltacyclopentatrienes [CoCp(RGe(R’CCR’)GeR)], that can be regarded as insertion products of an alkyne into the formal Ge≡Ge triple bond of the digermyne cobalt complex. First steps on the elucidation and rationalization of the rich reactivity of these compounds are given in form of mechanistical pathways.
 On the other hand, cationic group 10 tetrylidyne complexes [L3MER]+ were investigated, where the peculiar properties of the heavier tetrel atoms E = Si to Pb contribute to an unprecedented electronic structure of the resulting complexes, which differs from that of similar carbon analogues.
 Standing on its own, Part C is meant to cover efforts in experimental mass spectrometry applied on group 6 transition metal germylidyne complexes [LnM≡GeR]. After a brief introduction into mass spectrometry, the technique is presented which leads to an inert measurement without significant sample decomposition, and relevant features of the corresponding mass spectra of these complexes are highlighted.
Quantum uncertainty as classical uncertainty of real-deterministic variables constructed from complex weak values and a global random variable
Creators: name: Budiyono, Agung
name: Dipojono, Hermawan K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: What does it take for real-deterministic c-valued (i.e., classical, commuting) variables to comply with the Heisenberg uncertainty principle? Here, we construct a class of real-deterministic c-valued variables out of the weak values obtained via a non-perturbing weak measurement of quantum operators with a post-selection over a complete set of state vectors basis, which always satisfies the Kennard-Robertson-Schrödinger uncertainty relation. First, we introduce an auxiliary global random variable and couple it to the imaginary part of the weak value to transform the incompatibility between the quantum operator and the basis into the fluctuation of an `error term', and then superimpose it onto the real-part of the weak value. We show that this class of ``c-valued physical quantities'' provides a real-deterministic contextual hidden variable model for the quantum expectation value of a certain class of operators. We then show that the Schrödinger and the Kennard-Robertson lower bounds can be obtained separately by imposing the classical uncertainty relation to the c-valued physical quantities associated with a pair of Hermitian operators. Within the representation, the complementarity between two incompatible quantum observables manifests the absence of a basis wherein the error terms of the associated two c-valued physical quantities simultaneously vanish. Furthermore, quantum uncertainty relation is captured by a specific irreducible epistemic restriction, foreign in classical mechanics, constraining the allowed form of the joint distribution of the two c-valued physical quantities. We then suggest an epistemic interpretation of the two terms decomposing the c-valued physical quantity as the optimal estimate under the epistemic restriction and the associated estimation error, and discuss the classical limit.
Η συμβολή του προγράμματος Erasmus+ ΚΑ3 στην ανάπτυξη καινοτόμων εκπαιδευτικών πολιτικών στην Ε.Ε: Ποιοτική ανάλυση των προσεγγίσεων και των αποτελεσμάτων σχετικών έργων της περιόδου 2014-2017
Creators: name: Πασχαλίδου, Βασιλική Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Ευρωπαϊκή Ένωση
Ευρωπαϊκά εκπαιδευτικά προγράμματα
Καινοτόμες εκπαιδευτικές πολιτικές
European Union
European educational programmes
Innovative educational policies

description: Η παρούσα εργασία αποτελεί μια προσπάθεια να εξεταστούν γενικά τα Ευρωπαϊκά προγράμματα και ειδικότερα τα Ευρωπαϊκά προγράμματα για την εκπαίδευση μέσα από μια ιστορική αναδρομή, καθώς και να αναλυθεί το πρόγραμμα Erasmus+ και πιο συγκεκριμένα η δράση του Προγράμματος Erasmus+ ΚΑ3. Αρχικά, γίνεται μια ανασκόπηση των Προγραμμάτων της Ευρωπαϊκής Ένωσης και αναλύεται η εκπαιδευτική πολιτική στην Ευρωπαϊκή Ένωση μέσω της διαθέσιμης βιβλιογραφίας και αρθρογραφίας. Επίσης, γίνεται εκτενής περιγραφή του προγράμματος Erasmus+KA3 και αναφέρονται οι καινοτόμες εξελίξεις στην εκπαίδευση και στα προγράμματα στην ΕΕ. Στο δεύτερο μέρος της εργασίας παρατίθεται η ποιοτική ανάλυση των προσεγγίσεων και των αποτελεσμάτων των σχετικών έργων της περιόδου 2014-2017, μέσω της έρευνας ανάλυσης περιεχομένου, κατά την οποία αποδεικνύεται ως βασικό εύρημα ότι η συμβολή του Προγράμματος Erasmus+ ΚΑ3 στην ανάπτυξη καινοτόμων εκπαιδευτικών πολιτικών είναι σημαίνουσα. Τέλος, επισημαίνονται κάποια συμπεράσματα, περιορισμοί της έρευνας και προτάσεις για περαιτέρω έρευνα και μελέτη
description: This present dissertation is an attempt to investigate the European programs in general and most particularly the European Educational Programs through a historical review, as well as to analyze the Erasmus + program and more concretely the action of the Erasmus + Key Action 3 Program. Initially, a review of the European Union's Programs is carried out and the educational policies in the European Union are analyzed based on the available literature and articles. There is also an extensive description of the Erasmus+ KA3 program and the innovative developments in education and programs in the EU. The second part of the dissertation presents a qualitative analysis of the approaches and the deliverables of the relevant projects of the period 2014-2017 through the content analysis research, which demonstrates as a key finding that the contribution of the Erasmus+ KA3 Programme to the development of innovative educational policies is significant. Finally, some conclusions, limitations and suggestions for further research from this analysis are being highlighted
Light Four-quark States and New Observations by BES
Creators: name: Zhang, Ailin
name: Huang, Tao
name: Steele, Tom
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Four-quark states are discussed within the constituent quark model. Incompleteness of existed studies of four-quark state with QCD sum rule is analyzed. The masses of diquark cluster were determined by QCD sum rules, and light four-quark states masses were obtained in terms of the diquark. The four-quark state possibility of the newly observed near-threshold p\bar p enhancement, X(1835), X(1812) and X(1576) by BES is discussed.
description: 4pages, no figure, PTPTEX, talk at the Yukawa International Seminar (YKIS2006), "New frontiers in QCD", Kyoto, Japan
Adaptive Contact Strategies in Telephone and Face-to-Face Surveys
Creators: name: Wagner, James
Publisher: name: European Survey Research Association
Year: 2012
Subjects: calling strategies; responsive design; household nonresponse

description: In attempting to contact households for a survey, it is necessary to determine the timing of each call. Often, average "best" times to call are used in order to determine when to place the first call(s). The timing of subsequent calls is then governed by very general rules. This paper tests an experimental method that uses multi-level models to predict the times that have the highest probability of contact for each household and uses the predictions from these models to prioritize cases for calling. The predictions are updated each day in real-time as additional data are gathered. The method is evaluated through a series of experiments on a telephone survey that used automated call scheduling and an experiment on a face-to-face survey, where a recommended calling time was delivered to interviewers. The results of these experiments are used to suggest directions for future research.
description: Survey Research Methods, Vol 7, No 1 (2013)
Continual Learning for Recurrent Neural Networks: an Empirical Evaluation
Creators: name: Cossu, Andrea
name: Carta, Antonio
name: Lomonaco, Vincenzo
name: Bacciu, Davide
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Learning continuously during all model lifetime is fundamental to deploy machine learning solutions robust to drifts in the data distribution. Advances in Continual Learning (CL) with recurrent neural networks could pave the way to a large number of applications where incoming data is non stationary, like natural language processing and robotics. However, the existing body of work on the topic is still fragmented, with approaches which are application-specific and whose assessment is based on heterogeneous learning protocols and datasets. In this paper, we organize the literature on CL for sequential data processing by providing a categorization of the contributions and a review of the benchmarks. We propose two new benchmarks for CL with sequential data based on existing datasets, whose characteristics resemble real-world applications. We also provide a broad empirical evaluation of CL and Recurrent Neural Networks in class-incremental scenario, by testing their ability to mitigate forgetting with a number of different strategies which are not specific to sequential data processing. Our results highlight the key role played by the sequence length and the importance of a clear specification of the CL scenario.
description: Published in Neural Networks
Why there are no elliptical galaxies more flattened than E7: thirty years later
Creators: name: Caimmi, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Elliptical galaxies are modelled as homeoidally striated Jacobi ellipsoids where the peculiar velocity distribution is anisotropic, or equivalently as their adjoints configurations i.e. classical Jacobi ellipsoids of equal mass and axes, in real or imaginary rotation. Reasons for the coincidence of bifurcation points from axisymmetric to triaxial configurations in both the sequences, contrary to earlier findings, are presented and discussed. The effect of centrifugal support at the ends of the major equatorial axis, is briefly outlined. The existence of a lower limit to the flattening of elliptical galaxies is investigated in dealing with a number of limiting situations. More specifically, (i) elliptical galaxies are considered as isolated systems, and an allowed region within Ellipsoidland, related to the occurrence of bifurcation points from ellipsoidal to pear-shaped configurations, is shown to be consistent with observations; (ii) elliptical galaxies are considered as embedded within dark matter haloes and, under reasonable assumptions, it is shown that tidal effects from hosting haloes have little influence on the above mentioned results; (iii) dark matter haloes and embedded elliptical galaxies, idealized as a single homeoidally striated Jacobi ellipsoid, are considered in connection with the cosmological transition from expansion to relaxation, by generalizing an earlier model, and the existence of a lower limit to the flattening of relaxed (oblate-like) configurations, is established. On the other hand, no lower limit is found to the elongation of relaxed (prolate-like) configurations, and the observed lack of elliptical galaxies more elongated than E7 needs a different physical interpretation, such as the fully investigated bending instabilities.
description: 47 pages, 2 figures, Improved version with bending instabilities mentioned and discussed, and related references added
title: Ευρωπαϊκό και Συγκριτικό Δίκαιο απαγόρευσης των διακρίσεων
title: Ευρωπαϊκό και Συγκριτικό Δίκαιο απαγόρευσης των διακρίσεων
Creators: name: Deliyanni Dimitrakou, Christina
name: Konsta, Anna Maria
Publisher: name: Kallipos, Open Academic Editions
Year: 2024
Subjects: Ισότητα
Τυπική Ισότητα
Ουσιαστική ισότητα
Ισότητα ευκαιριών
Ισότητα αποτελεσμάτων
Άμεση διάκριση
Έμμεση διάκριση
Πσρενόχληση
Σεξουαλική παρενόχληση
Θετικά μέτρα
Εύλογες προσαρμογές
Λόγοι διάκρισης
Πολλαπλή διάκριση
Διάκριση
Ανθρώπινη Αξιοπρέπεια
Θετικές δράσεις
Equality
Formal equality
Sustantive Equality
Equality of opportunities
Equality in practice
Discrimination
Direct discrimination
Indirect discrimination
Harassment
Sexual Harasment
Postitve measures
Positive action
Reasonable accommodation
Grounds of discrimination
Multiple Discrimination
Human Dignity

description: Στο βιβλίο «Ευρωπαϊκό και Συγκριτικό Δίκαιο απαγόρευσης των διακρίσεων» εξετάζονται από συγκριτική σκοπιά ορισμένα νομικά ζητήματα ....
description: Στο βιβλίο «Ευρωπαϊκό και Συγκριτικό Δίκαιο απαγόρευσης των διακρίσεων» εξετάζονται από συγκριτική σκοπιά ορισμένα νομικά ζητήματα ....