cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Cross-correlation studies as a probe of reionization physics
Creators: name: Slosar, Anze
name: Cooray, Asantha
name: Silk, Joseph
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The process of reionization is now believed to have proceeded in an orchestrated manner beginning with UV photons emitted by high redshift galaxies containing a large fraction of Population III stars carving out ionised regions around them. The physics during this era can be studied with a combination of redshifted 21-cm spin-flip transition tracing neutral hydrogen gas, IR emission from massive primordial stars that trace the global star-formation rate during reionization, and the imprint of hot-electrons in first supernovae remnants Compton-cooling off of cosmic microwave background (CMB) radiation through the Sunyaev-Zel'dovich effect. While these individual effects and their observable signatures have been advocated as probes of reionization history, here we show how cross-correlation studies between these signals can be used to further understand physics during reionization. Cross-correlation studies are advantageous since the measurable statistics do not suffer in the same manner from foregrounds and systematic effects as is the case of auto-correlation function measurements. We discuss the prospects for detecting various cross-correlation statistics using present and next generation experiments and the information related to reionization captured by them.
description: Revised version of a paper submitted to MNRAS in Dec 06; v2: updated references, matches version accepted by MNRAS
Σχεδίαση και ανάπτυξη εκπαιδευτικού λογισμικού για τη διάγνωση και αντιμετώπιση μαθησιακών δυσκολιών: εφαρμογή και αξιολόγηση σε παιδιά Δημοτικού
Creators: name: Καλαγκάνη, Μαρία Κοσμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: μαθησιακές δυσκολίες
εκπαιδευτικό λογισμικό
διάγνωση
learning disorders
educational software
diagnosis

description: Αντικείμενο της παρούσας εργασίας είναι η διερεύνηση του τρόπου με τον οποίο μπορεί ένα εκπαιδευτικό λογισμικό να χρησιμοποιηθεί και να επιτύχει στην αντιμετώπιση μαθησιακών δυσκολιών μαθητών Δημοτικού. Συγκεκριμένα, περιγράφεται το λογισμικό «ΠΑΙΧΝΙΔΟΔΑΣΟΣ ΜΕ ΓΡΑΜΜΑΤΑ ΚΑΙ ΑΡΙΘΜΟΥΣ» που υλοποιήθηκε. Ακόμη, αναφέρεται η προσπάθεια να εντοπιστούν μέσα από το λογισμικό τυχόν μαθησιακές δυσκολίες και να δοθούν τρόποι αντιμετώπισης / εξάσκησης στα γνωστικά πεδία της Γλώσσας και των Μαθηματικών. Τέλος, εξετάζονται τα αποτελέσματα της εφαρμογής και της αξιολόγησής του σε μαθητές Δημοτικών σχολείων.
description: The purpose of this study is to explore the way an educational software can be used and succeed in treating learning disabilities in primary school children. Particularly, it describes newly implemented educational software, called “PAIXNIDODASOS”. In addition, it analyzes the effort that has been made to detect possible learning difficulties through the software and to provide ways of treating / practicing in the fields of Greek Language and Maths. Finally, it presents the results of the implementation of the software in primary schools.
title: Conférence diplomatique de La Haye du 14-28 novembre 1960 pour la révision de l'Arrangement de La Haye concernant le dépôt international des dessins ou modèles :
title: Documents préliminaires propositions - avec exposé des motifs.
titleType: Subtitle
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 0

description: (F/E) : French and English version : 1e Volume : Documents pre?liminaires, propositions avec expose? des motifs (F/E); 2e Volume : Documents de la Confe?rence (F); 3e Volume : Documents de la Confe?rence (E); Documents Missing : E : 4, 6-12, 14, 18, 23, 34, 35, 41, 43, 45, 47, 51, 57, 61, 75, 80, 81, 92 and 111; F : 14, 36, 57, 75, 82, 92, 99, 110 and 11;.
title: Μέτρηση και συχνοτική ανάλυση εργασιακού θορύβου για την επιλογή των βέλτιστων μέσων ατομικής προστασίας
title: Occupational noise measurement and frequency analysis for the selection of the appropriate personal protection equipment
Creators: name: Σελλιανακης Νικολαος
Publisher: name: Technical University of Crete
Year: 2024

description: Ο θόρυβος αποτελεί σύνηθες πρόβλημα στον εργασιακό χώρο του βιομηχανικού κλάδου. Έτσι  η λήψη μέτρων ασφαλείας για την αντιμετώπιση του, είναι κρίσιμης σημασίας με σκοπό να διασφαλισθεί η υγεία των εργαζομένων καθώς και η ποιότητα της εργασίας τους. Οι ακουστικές συνέπειες του θορύβου στον εργαζόμενο μπορεί να μην γίνονται άμεσα αντιληπτές καθώς  συνήθως απαιτείται μακροχρόνια έκθεση σε αυτόν. Η ανάπτυξη προγραμμάτων προστασίας της ακοής των εργαζομένων, η οποία περιλαμβάνει και την χρήση των κατάλληλων μέσων ατομικής προστασίας  είναι εξαιρετικά σημαντική  ιδιαίτερα σε θορυβώδεις εργασιακούς χώρους, όπως οι αυτοί που συναντώνται στον λατομικό και μεταλλευτικό τομέα.  Η συχνοτική ανάλυση του θορύβου, η οποία εξετάζει πώς κατανέμεται η ηχητική ενέργεια σε διαφορετικές συχνότητες, βοηθά στην επιλογή των κατάλληλων προστατευτικών μέσων.
Στην παρούσα εργασία αναπτύσσεται μια μεθοδολογία για τη μέτρηση και ανάλυση του θορύβου σε εργασιακά περιβάλλοντα, προκειμένου να επιλέγονται τα καταλληλότερα μέσα προστασίας. Η μεθοδολογία αυτή εφαρμόστηκε σε λατομική επιχείρηση, όπου πραγματοποιήθηκαν μετρήσεις θορύβου σε συγκεκριμένες θέσεις εργασίας. Αρχικά υπολογίσθηκαν η ημερήσια στάθμη και δόση θορύβου για τους εργαζόμενους και στη συνέχεια πραγματοποιήθηκε συχνοτική ανάλυση του θορύβου και επιλογή του  καταλληλότερου  ατομικού προστατευτικού εξοπλισμού για την ακοή του εργαζομένου. Η επιλογή βασίστηκε στον υπολογισμό της επιτυγχανόμενης μείωσης θορύβου βάσει των τιμών εξασθένισης του θορύβου που εξασφαλίζει ένα μέσο ατομικής προστασίας και των τιμών της έντασης του θορύβου ανά συχνότητα που προέκυψε από την ανάλυση. Εξετάστηκαν 4 διαφορετικές θέσεις εργασίας (χειριστής φορτωτή, χειριστής διατρητικού, οδηγός χωματουργικού αυτοκινήτου και εργαζόμενος στο θάλαμο ελέγχου του συγκροτήματος θραύσης) και 2 σενάρια ως προς τον πραγματικό χρόνο έκθεσης των εργαζομένων (8 και 5 ώρες αντίστοιχα).
Τα αποτελέσματα έδειξαν ότι η υψηλότερη ισοδύναμη ημερήσια μετρήθηκε εκείνη του οδηγού χωματουργικού αυτοκινήτου (θέση μεταφοράς - απόθεσης). Σε σχέση με τα ατομικά μέσα προστασίας που εξετάστηκαν, οι ωτοασπίδες (τύπος M™ Peltor™ X Series Earmuffs) παρέχουν αποδεκτή προστασία, τα ωτοβύσματα (τύπος 3M™ E-A-RSoft™ και τύπος 3M™ Disposable Earplugs 1120/1130) καλή. Τα τελευταία κρίθηκαν ότι είναι τα καταλληλότερα για τις θέσεις εργασίας που εξετάστηκαν.
Stability of the Minimal Heterotic Standard Model Bundle
Creators: name: Braun, Volker
name: He, Yang-Hui
name: Ovrut, Burt A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The observable sector of the "minimal heterotic standard model" has precisely the matter spectrum of the MSSM: three families of quarks and leptons, each with a right-handed neutrino, and one Higgs-Higgs conjugate pair. In this paper, it is explicitly proven that the SU(4) holomorphic vector bundle leading to the MSSM spectrum in the observable sector is slope-stable.
description: LaTeX, 19 pages
Observed and modelled characteristics of the marine atmospheric boundary layer over the Northeast Pacific Ocean : a cold air outbreak case study
Creators: name: Unrau, Greg
Publisher: name: University of British Columbia
Year: 2009

description: The Marine Atmospheric Boundary Layer was investigated during a cold air outbreak (CAO) over the Northeast Pacific ocean. The horizontal structure and downwind modification of the lower boundary layer were studied. Considerable moisture is supplied to the atmosphere through the turbulent flux of latent heat. The bulk flux of latent heat increases downwind while the bulk flux of sensible heat decreases. The highest recorded total surface heat flux is 365 Wm⁻² based on eddy correlation statistics. Turbulence kinetic energy increases downwind and velocity variances were found to be more sensitive to stability than others have observed (Panofsky et al, 1977). A spectral analysis suggests the presence of roll circulations in the horizontal wind components (u, v) and specific humidity q at scales ranging from 5 to 25 km, as well as an increasing roll aspect ratio downstream. Boundary layer height increases downwind but height isolines are oriented more perpendicular to the sea surface temperature gradient than to the mean wind direction. A quasi-two-dimensional K-theory similarity model (Brown, 1972, 1974a, 1974b) was applied to a 40 x 40 horizontal grid and was used to estimate surface air velocities, stability and surface sensible heat flux. It incorporates the effects of stratification and baroclinicity and unlike other boundary layer models, explicitly parameterizes large eddy circulations. Model derived near surface air velocities, friction velocities and the flux of sensible heat emulate observed fields reasonably well. Modelled velocities are larger than observed values but not significantly in well determined regions of the model domain. In regions where modelled and observed air velocities agreed poorly, data paucity and nonstationarity effects are the proposed causes.
The statistical significance of the superhump signal in U Gem
Creators: name: Schreiber, Matthias R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Although its well determined mass ratio of $q=\Msec/\Mwd=0.357\pm0.007$ should avoid superoutbursts according to the thermal tidal instability model, the prototypical dwarf nova U Gem experienced in 1985 an extraordinary long outburst resembling very much superoutbursts observed in SU UMa systems. Recently, the situation for the model became even worse as superhump detections have been reported for the 1985 outburst of U Gem. The superhump signal is noisy and the evidence provided by simple periodograms seems to be weak. Therefore and because of the importance for our understanding of superoutbursts and superhumps, we determine the statistical significance of the recently published detection of superhumps in the AAVSO light curve of the famous long 1985 outburst of U Gem. Using Lomb-Scargle periodograms, analysis of variance (AoV), and Monte-Carlo methods we analyse the 160 visual magnitudes obtained by the AAVSO during the outburst and relate our analyse to previous superhump detections. The 160 data points of the outburst alone do not contain a statistically significant period. However, using additionally the characteristics of superhumps detected previously in other SU UMa systems and searching only for signals that are consistent with these, we derive a $2σ$ significance for the superhump signal. The alleged appearance of an additional superhump at the end of the outbursts appears to be statistically insignificant. Although of weak statistical significance, the superhump signal of the long 1985 outburst of U Gem can be interpreted as further indication for the SU UMa nature of this outburst. This further contradicts the tidal instability model as the explanation for the superhump phenomenon.
description: 7 pages, 7 figures, accepted for publication in A&A
A Semantic Framework for Enabling Radio Spectrum Policy Management and Evaluation
Creators: name: Santos, H.
name: Mulvehill, A.
name: Erickson, J. S.
name: McCusker, J. P.
name: Gordon, M.
name: Xie, O.
name: Stouffer, S.
name: Capraro, G.
name: Pidwerbetsky, A.
name: Burgess, J.
name: Berlinsky, A.
name: Turck, K.
name: Ashdown, J.
name: McGuinness, D. L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Because radio spectrum is a finite resource, its usage and sharing is regulated by government agencies. These agencies define policies to manage spectrum allocation and assignment across multiple organizations, systems, and devices. With more portions of the radio spectrum being licensed for commercial use, the importance of providing an increased level of automation when evaluating such policies becomes crucial for the efficiency and efficacy of spectrum management. We introduce our Dynamic Spectrum Access Policy Framework for supporting the United States government's mission to enable both federal and non-federal entities to compatibly utilize available spectrum. The DSA Policy Framework acts as a machine-readable policy repository providing policy management features and spectrum access request evaluation. The framework utilizes a novel policy representation using OWL and PROV-O along with a domain-specific reasoning implementation that mixes GeoSPARQL, OWL reasoning, and knowledge graph traversal to evaluate incoming spectrum access requests and explain how applicable policies were used. The framework is currently being used to support live, over-the-air field exercises involving a diverse set of federal and commercial radios, as a component of a prototype spectrum management system.
New D-term chaotic inflation in supergravity and leptogenesis
Creators: name: Kadota, Kenji
name: Kawano, Teruhiko
name: Yamaguchi, Masahide
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a new model of D-term dominated chaotic inflation in supergravity. The F-flat direction present in this model is lifted by the dominant D-term, which leads to chaotic inflation and subsequent reheating. No cosmic string is formed after inflation because the U(1) gauge symmetry is broken during inflation. The leptogenesis scenario via the inflaton decay in our D-term chaotic inflation scenario is also discussed.
description: 14 pages, no figure, to appear in Phys. Rev. D
Statistical complexity is maximized close to criticality in cortical dynamics
Creators: name: Lotfi, Nastaran
name: Feliciano, Thaís
name: Aguiar, Leandro A. A.
name: Silva, Thais Priscila Lima
name: Carvalho, Tawan T. A.
name: Rosso, Osvaldo A.
name: Copelli, Mauro
name: Matias, Fernanda S.
name: Carelli, Pedro V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Complex systems are typically characterized as an intermediate situation between a complete regular structure and a random system. Brain signals can be studied as a striking example of such systems: cortical states can range from highly synchronous and ordered neuronal activity (with higher spiking variability) to desynchronized and disordered regimes (with lower spiking variability). It has been recently shown, by testing independent signatures of criticality, that a phase transition occurs in a cortical state of intermediate spiking variability. Here, we use a symbolic information approach to show that, despite the monotonical increase of the Shannon entropy between ordered and disordered regimes, we can determine an intermediate state of maximum complexity based on the Jensen disequilibrium measure. More specifically, we show that statistical complexity is maximized close to criticality for cortical spiking data of urethane-anesthetized rats, as well as for a network model of excitable elements that presents a critical point of a non-equilibrium phase transition.
description: 8 pages, 6 figures
Inconsistent metallicity spreads in first generation stars of globular clusters from high resolution spectroscopy and HST photometry
Creators: name: Carretta, Eugenio
name: Bragaglia, Angela
Publisher: name: arXiv
Year: 2025
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: An open issue about multiple stellar populations in globular clusters (GCs) is the possible existence of metallicity spreads in first generation (FG) stars. Recent estimates based on HST pseudo-colours map (PCM) derived unlikely large spreads in [Fe/H] from spreads in the colour col=m_{F275W}-m_{F814W}. The inferred metallicity spreads for many GCs are comparable or even larger than those observed in dwarf galaxies. This result is clearly unexpected and at odds with the birth time of stars in dwarf galaxies, spanning several billion years, as opposed to very short formation times of the stellar component in GCs (a few million years). The contradiction is corroborated by the comparison of the widths of red giant branches in both classes of objects. Moreover, the so called spreads in FG stars estimated from the PCMs are always larger than the intrinsic metallicity spreads derived from spectroscopy. We used 30 pairs of FG stars with similar parameters in 12 GCs to highlight that a constant displacement in Delta col corresponds to variable differences in [Fe/H] up to 0.2 dex, depending on the GC. Providing for the first time quantitative measurements of the extension in Delta col of the sequences of FG and SG stars, we found no relation between metallicity spreads previously derived and extension of FG stars. We found that the length of the FG region correlates with the average global metallicity of GCs, and not with the observed metallicity spreads. The extension of FG stars also correlates with the extension of SG stars, and the global mass of the GCs. Our findings seriously challenge the scenario claiming more inhomogeneous mixing among FG stars, invalidating previous speculations in the literature.
description: 18 pages, 17 figures, plus an Appendix with 5 pages and 5 figures, accepted for publication on Astronomy and Astrophysics
Effectiveness of Court-Type Traditional Thai Massage in Patients with Chronic Tension-Type Headache: a Pilot Study
Creators: name: Peerada Damapong
name: Naowarat Kanchanakhan
name: Wichai Eungpinichpong
name: Pongmada Damapong
Publisher: name: Chulalongkorn University Press
Year: 2015
Subjects: Effectiveness,Thai massage,Tension-type headache

description: 5, 29, Journal of Health Research
Analysis of IUE spectra of helium-rich white dwarf stars
Creators: name: Castanheira, B. G.
name: Kepler, S. O.
name: Handler, G.
name: Koester, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We studied the class of DB white dwarf stars, using re-calibrated UV spectra for thirty four DBs obtained with the IUE satellite. By comparing the observed energy distributions with model atmospheres, we simultaneously determine spectroscopic distances (d), effective temperature (Teff), and surface gravities (log g). Using parallax measurements and previous determinations of Teff and log g from optical spectra, we can study whether the atmospheres of eleven DB stars are consistent with pure He or have a small amount of H contamination. We also report on our observations of seventeen stars with Teff close to the DB instability strip through time series photometry and found them to be non variable within our detection limits.
description: 8 pages, 5 figures
title: Professional Development for Academics in Exile: A Case Study of Syrian Academics in the City of Gaziantep, Turkey
Creators: name: Acac, Nidal
Publisher: name: University of Kent
Year: 2024

description: The war and ongoing crisis in Syria have compelled thousands of academics to flee their homeland, confronting them with severe hardships in exile. These challenges have undermined multiple aspects of their academic identity and skills, eroding the substantial human capital they represent and limiting their potential contributions to the reconstruction of higher education in Syria and the stabilisation of their communities inside and outside the country. Despite the severity and urgency of these challenges, and growing interest in Syrian academics' predicament among international scholars, there remains a shortage of studies conducted by Syrian academics themselves. 
In this study, writing as an exiled Syrian academic, I offer an insider's perspective into the situation of Syrian academics in exile in Gaziantep, Turkey, a city located close to the Syrian border and home to the largest concentration of displaced Syrians in Turkey. 
This qualitative research study adopts a constructivist paradigm and utilises a case study methodology, guided by Robert Stake's (1995) perspective. Insights are drawn from individual semi-structured interviews (n=24), three focus group discussions (n=23), and continuous participant observation. The findings reveal the impacts of the participants' academic journeys on their current strengths and limitations, highlighting a broad spectrum of both academic and non-academic assets and needs. Additionally, my research underscores the absence of a cohesive academic community among Syrian academics in Gaziantep and articulates their aspirations and proposals to build and nurture such a community. Furthermore, it points out the scarcity of support from the academic community in the host country and the international academic sphere, with some notable exceptions. 
The study highlights the critical need for targeted initiatives that leverage the assets of Syrian academics in exile and address their specific needs, thereby preserving their intellectual capital and facilitating their ongoing contributions to academia and society. It provides essential insights for key stakeholders, including policymakers, educational organisations, and funding agencies, enabling them to make informed decisions and develop more effective support strategies. These insights are crucial not only for Syrian academics but also for addressing the broader challenges faced by academics in similar situations worldwide. Finally, I present some workshop tools and frameworks, informed directly by the findings of this research, for strategic planning and community-building with displaced or otherwise marginalised academic communities.
Strong accessibility for hyperbolic groups
Creators: name: Vavrichek, Diane M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Group Theory (math.GR)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We use an accessibility result of Delzant and Potyagailo to prove Swarup's Strong Accessibility Conjecture for Gromov hyperbolic groups with no 2-torsion. It follows that, if M is an irreducible, orientable, compact 3-manifold with hyperbolic fundamental group, then any hierarchy in which M is decomposed alternately along compressing disks and essential annuli is finite.
description: 18 pages, 6 figures; modified due to an error in v1
A protocol for time-resolved transcriptomics through metabolic labeling and combinatorial indexing.
Creators: name: Maizels, Rory J
name: Snell, Daniel M
name: Briscoe, James
Publisher: name: The Francis Crick Institute
Year: 2024
Subjects: classificationCode: Gene Expression
subject: Gene Expression

description: The snapshot nature of single-cell transcriptomics presents a challenge for studying the dynamics of gene expression. Metabolic labeling, where nascent RNA is labeled with 4-thiouridine (4sU), captures temporal information at the single-cell level, providing greater insight into expression dynamics. Here, we present an optimized, automation-friendly protocol for the metabolic labeling of RNA alongside single-cell RNA sequencing through combinatorial indexing. We describe steps for 4sU labeling, cell fixation and chemical treatment, and automated two-level combinatorial indexing. For complete details on the use and execution of this protocol, please refer to Maizels et al.1.
Revisiting LSTM Networks for Semi-Supervised Text Classification via Mixed Objective Function
Creators: name: Sachan, Devendra Singh
name: Zaheer, Manzil
name: Salakhutdinov, Ruslan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: In this paper, we study bidirectional LSTM network for the task of text classification using both supervised and semi-supervised approaches. Several prior works have suggested that either complex pretraining schemes using unsupervised methods such as language modeling (Dai and Le 2015; Miyato, Dai, and Goodfellow 2016) or complicated models (Johnson and Zhang 2017) are necessary to achieve a high classification accuracy. However, we develop a training strategy that allows even a simple BiLSTM model, when trained with cross-entropy loss, to achieve competitive results compared with more complex approaches. Furthermore, in addition to cross-entropy loss, by using a combination of entropy minimization, adversarial, and virtual adversarial losses for both labeled and unlabeled data, we report state-of-the-art results for text classification task on several benchmark datasets. In particular, on the ACL-IMDB sentiment analysis and AG-News topic classification datasets, our method outperforms current approaches by a substantial margin. We also show the generality of the mixed objective function by improving the performance on relation extraction task.
description: Published at AAAI 2019
One version of the Clark representation theorem for Arratia flow
Creators: name: Dorogovtsev, Andrey A
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H05, 60H40, 60J65, 60K35

description: The article contains description of the functionals from the family of coalescing Brownian particles. New type of the stochastic integral is introduced and used.
description: 9 pages
Impurity in a granular gas under nonlinear Couette flow
Creators: name: Reyes, F. Vega
name: Garzo, V.
name: Santos, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study in this work the transport properties of an impurity immersed in a granular gas under stationary nonlinear Couette flow. The starting point is a kinetic model for low-density granular mixtures recently proposed by the authors [Vega Reyes F et al. 2007 Phys. Rev. E 75 061306]. Two routes have been considered. First, a hydrodynamic or normal solution is found by exploiting a formal mapping between the kinetic equations for the gas particles and for the impurity. We show that the transport properties of the impurity are characterized by the ratio between the temperatures of the impurity and gas particles and by five generalized transport coefficients: three related to the momentum flux (a nonlinear shear viscosity and two normal stress differences) and two related to the heat flux (a nonlinear thermal conductivity and a cross coefficient measuring a component of the heat flux orthogonal to the thermal gradient). Second, by means of a Monte Carlo simulation method we numerically solve the kinetic equations and show that our hydrodynamic solution is valid in the bulk of the fluid when realistic boundary conditions are used. Furthermore, the hydrodynamic solution applies to arbitrarily (inside the continuum regime) large values of the shear rate, of the inelasticity, and of the rest of parameters of the system. Preliminary simulation results of the true Boltzmann description show the reliability of the nonlinear hydrodynamic solution of the kinetic model. This shows again the validity of a hydrodynamic description for granular flows, even under extreme conditions, beyond the Navier-Stokes domain.
description: 23 pages, 11 figures; v2: Preliminary DSMC results from the Boltzmann equation included, Fig. 11 is new
Scalar Dark Matter Effects in Higgs and Top Quark Decays
Creators: name: He, Xiao-Gang
name: Li, Tong
name: Li, Xue-Qian
name: Tsai, Ho-Chin
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study possible observational effects of scalar dark matter, the darkon D, in Higgs h and top quark t decay processes, h->DD and t->cDD in the minimal Standard Model (SM) and its two Higgs doublet model (THDM) extension supplemented with a SM singlet darkon scalar field D. We find that the darkon D can have a mass in the range of sub-GeV to several tens of GeV, interesting for LHC and ILC colliders, to produce the required dark matter relic density. In the SM with a darkon, t->cDD only occurs at loop level giving a very small rate, while the rate for Higgs decay h->DD can be large. In THDM III with a darkon, where tree level flavor changing neutral current (FCNC) interaction exists, a sizable rate for t->cDD is also possible.
description: 6 pages, 4 figures, Contribution to 2006 Symposium of CosPA; Typos corrected and new references added
Constraining the fundamental parameters of the O-type binary CPD-41degr7733
Creators: name: Sana, H.
name: Rauw, G.
name: Gosset, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using a set of high-resolution spectra, we studied the physical and orbital properties of the O-type binary CPD-41 7733, located in the core of \ngc. We report the unambiguous detection of the secondary spectral signature and we derive the first SB2 orbital solution of the system. The period is 5.6815 +/- 0.0015 d and the orbit has no significant eccentricity. CPD-41 7733 probably consists of stars of spectral types O8.5 and B3. As for other objects in the cluster, we observe discrepant luminosity classifications while using spectroscopic or brightness criteria. Still, the present analysis suggests that both components display physical parameters close to those of typical O8.5 and B3 dwarfs. We also analyze the X-ray light curves and spectra obtained during six 30 ks XMM-Newton pointings spread over the 5.7 d period. We find no significant variability between the different pointings, nor within the individual observations. The CPD-41 7733 X-ray spectrum is well reproduced by a three-temperature thermal mekal model with temperatures of 0.3, 0.8 and 2.4 keV. No X-ray overluminosity, resulting e.g. from a possible wind interaction, is observed. The emission of CPD-41 7733 is thus very representative of typical O-type star X-ray emission.
description: Accepted by ApJ, 15 pages, 9 figures
Η αρχή της Νεολιθικής στην Ελλάδα και τα νέα δεδομένα:
Creators: name: Αρβανιτάκη, Μαργαρίτα Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Νεολιθική
Ελλάδα
Μετάβαση
Θηρευτές-Τροφοσυλλέκτες
Πρώτοι Γεωργοί
Μεσολιθική
Neolithic
Greece
Transition
Hunters-Gatherers
First farmers
Mesolithic

description: Στόχος της παρούσας εργασίας είναι να συμβάλλει στη συζήτηση του ζητήματος της μετάβασης από τη θηρευτική-τροφοσυλλεκτική στη γεωργική οικονομία, στη γεωγραφική περιοχή του ελλαδικού χώρου, περίπου 7000 χρόνια πριν από σήμερα. Προκειμένου να επιτευχθεί ο στόχος αυτός εξετάζονται τα αρχαιολογικά δεδομένα που επιτρέπουν τη μελέτη των τεχνολογικών, οικιστικών, διατροφικών και οικονομικών πρακτικών των τελευταίων θηρευτών-τροφοσυλλεκτών και των πρώτων γεωργών του ελλαδικού χώρου, ώστε να διευκρινιστεί η μεταξύ τους σχέση. Στο πλαίσιο της εργασίας αυτής περιγράφεται το ζήτημα της εξάπλωσης του νεολιθικού τρόπου ζωής και το θέμα της εμφάνισης της γεωργικής οικονομίας στην περιοχή της Μέσης Ανατολής και της εξάπλωσής της στην περιοχή της Κύπρου. Στη συνέχεια περιγράφονται οι οικιστικές, τεχνολογικές, οικονομικές και διατροφικές πρακτικές που χαρακτηρίζουν την Ανώτερη Παλαιολιθική, τη Μεσολιθική και την Αρχαιότερη Νεολιθική περίοδο στον ελλαδικό χώρο, ενώ γίνεται μια λεπτομερής αναφορά των απόψεων που έχουν διατυπωθεί σε σχέση με τη μετάβαση στο παραγωγικό στάδιο στην περιοχή του ελλαδικού χώρου. Επίσης, αναφέρονται και εξετάζονται τα δεδομένα που έχουν αποκαλυφθεί κατά τη διάρκεια πρόσφατων ερευνών και μπορούν να εμπλουτίσουν τη συζήτηση. Στο συμπερασματικό μέρος της εργασίας περιγράφονται και συγκρίνονται τα χαρακτηριστικά της Μεσολιθικής και της Αρχαιότερης Νεολιθικής περιόδου στον ελλαδικό χώρο προκειμένου να διευκρινιστεί η μεταξύ τους σχέση και να συγκροτηθεί η ιστορία που μπορούν να «αφηγηθούν» τα δεδομένα αυτά σε σχέση με την εμφάνιση της γεωργικής οικονομίας.
description: The objective of this study is to contribute to the issue of the transition from hunting and gathering economy to the cultivation of domesticated crops and animal husbandry in the geographical area of Greece, approximately 7000 years ago. In order to achieve this objective and clarify the relationship between the last Mesolithic and the first Neolithic inhabitants of this specific geographical area, the archaeological data such as the technological, nutritional, economical and housing practices of the last gatherers and the first farmers are being described and compared. This work examines in brief the appearance of the first agricultural communities in the Middle East and their expansion to the island of Cyprus and then continues on describing in detail the economical, technological and nutritional aspects, that are visible through the archaeological data of Mesolithic and Early Neolithic sites in Greece, in an attempt to set up the story that can be extracted from the thorough examination and comparative study of the archaeological material.
Minimum Parametrization of the Cauchy Stress Operator
Creators: name: Pommaret, J. -F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 35N10, 35Q75, 53B20, 83C05, 83C35

description: When ${\cal{D}}:ξ\rightarrow η$ is a linear differential operator, a "direct problem " is to find the generating compatibility conditions (CC) in the form of an operator ${\cal{D}}_1:η\rightarrow ζ$ such that ${\cal{D}}ξ=η$ implies ${\cal{D}}_1η=0$. When ${\cal{D}}$ is involutive, the procedure provides successive first order involutive operators ${\cal{D}}_1, ... , {\cal{D}}_n$ when the ground manifold has dimension $n$. Conversely, when ${\cal{D}}_1$ is given, a more difficult " inverse problem " is to look for an operator ${\cal{D}}: ξ\rightarrow η$ having the generating CC ${\cal{D}}_1η=0$. If this is possible, that is when the differential module defined by ${\cal{D}}_1$ is torsion-free, one shall say that the operator ${\cal{D}}_1$ is parametrized by ${\cal{D}}$ and there is no relation in general between ${\cal{D}}$ and ${\cal{D}}_2$. The parametrization is said to be " minimum " if the differential module defined by ${\cal{D}}$ has a vanishing differential rank and is thus a torsion module. The parametrization of the Cauchy stress operator in arbitrary dimension $n$ has attracted many famous scientists (G.B. Airy in 1863 for $n=2$, J.C. Maxwell in 1863, G. Morera and E. Beltrami in 1892 for $n=3$, A. Einstein in 1915 for $n=4$) . This paper proves that all these works are using the Einstein operator and not the Ricci operator. As a byproduct, they are all based on a confusion between the so-called $div$ operator induced from the Bianchi operator ${\cal{D}}_2$ and the Cauchy operator which is the formal adjoint of the Killing operator ${\cal{D}}$ parametrizing the Riemann operator ${\cal{D}}_1$ for an arbitrary $n$. Like the Michelson and Morley experiment, it is an open historical problem to know whether Einstein was aware of these previous works or not, as the comparison needs no comment.
description: The purpose of this paper is to prove that Einstein equations had already been exhibited by E. Beltrami 20 years before A. Einstein and to solve the minimum parametrization problem in arbitrary dimension
title: Factors affecting the haemagglutination inhibition test with feline panleukopaenia virus
Creators: name: Quayson, Kingsley
Publisher: name: The University of Edinburgh
Year: 1981
Subjects: subject: Annexe MSc Digitisation Project 2022 Block 47
subject: Haemagglutination inhibition (HI) test
subject: Feline panleukopaenia virus (FPLV)
subject: pH
subject: Red blood cell (RBC) concentration
subject: Non-specific agglutinins and inhibitors

description: As far as it could, be ascertained this work represents the first real attempt to define the factors that influence the HI test with FPLV. Most workers prefer to use the SN test, a procedure which is time consuming, laborious and not easily applicable as a routine diagnostic testo The techniques of HA and HI are so simple that they easily find a place as sérodiagnostic tools in the investigation of many other diseases in most laboratories. The test was defined by pH, the number of HA units of virus, RBC concentration, incubation, temperature, incubation time, non-specific agglutinins and inhibitors. The optimum pH was 6.8. HI titres varied in inverse proportion to the number of HA units of virus« For every two-fold increase in the number of HA units HI titres were depressed three-fold. A strong positive correlation was found between HI titres and RBC concentration. For every one fold increase in RBC concentration HI titres were increased eight-fold. The minimum incubation time was 3 hours. 4°C was the only suitable operating temperature. The test was influenced to a significant degree by the presence of non-specific agglutinins and inhibitors. Their removal by heat, followed by kaolin and RBC absorption was necessary before specific HI could be discerned.
Electronic Hong-Ou-Mandel interferometer for multi-mode entanglement detection
Creators: name: Giovannetti, Vittorio
name: Frustaglia, Diego
name: Taddei, Fabio
name: Fazio, Rosario
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that multi-mode entanglement of electrons in a mesoscopic conductor can be detected by a measurement of the zero-frequency current correlations in an electronic Hong-Ou-Mandel interferometer. By this mean, one can further establish a lower bound to the entanglement of formation of two-electron input states. Our results extend the work of Burkard and Loss [Phys. Rev. Lett. 91, 087903 (2003)] to many channels and provide a way to test the existence of entangled states involving both orbital and spin degrees of freedom.
description: 6 pages. Revised version. Ref. added
Nuclear Spins as Quantum Memory in Semiconductor Nanostructures
Creators: name: Witzel, W. M.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We theoretically consider solid state nuclear spins in a semiconductor nanostructure environment as long-lived, high-fidelity quantum memory. In particular, we calculate, in the limit of a strong applied magnetic field, the fidelity versus time of P donor nuclear spins in random bath environments of Si and GaAs, and the lifetime of excited intrinsic spins in polarized Si and GaAs environments. In the former situation, the nuclear spin dephases due to spectral diffusion induced by the dipolar interaction among nuclei in the bath. We calculate the decay of nuclear spin quantum memory in the context of Hahn and Carr-Purcell-Meiboom-Gill (CPMG) refocused spin echoes using a formally exact cluster expansion technique which has previously been successful in dealing with electron spin dephasing in a solid state nuclear spin bath. With decoherence dominated by transverse dephasing (T2), we find it feasible to maintain high fidelity (losses of less than 10^{-6}) quantum memory on nuclear spins for times of the order of 100 microseconds (GaAs:P) and 1 to 2 milliseconds (natural Si:P) using CPMG pulse sequences of just a few (~2-4) applied pulses. We also consider the complementary situation of a central flipped intrinsic nuclear spin in a bath of completely polarized nuclear spins where decoherence is caused by the direct flip-flop of the central spin with spins in the bath. Exact numerical calculations that include a sufficiently large neighborhood of surrounding nuclei show lifetimes on the order of 1-5 ms for both GaAs and natural Si. Our calculated nuclear spin coherence times may have significance for solid state quantum computer architectures using localized electron spins in semiconductors where nuclear spins have been proposed for quantum memory storage.
Modelling Laurentide ice stream thermomechanics
Creators: name: Marshall, Shawn Joseph
Publisher: name: University of British Columbia
Year: 2009

description: Ice streams are fast-flow currents which represent a small areal fraction in an ice sheet but account for the majority of ice sheet drainage. Because ice streams are inherently complex and are subgrid in current numerical models, they have not been portrayed in large-scale ice sheet studies. I employ a continuum mixture framework to incorporate ice streams in a three-dimensional thermomechanical model of the Laurentide Ice Sheet. The ice mass is composed of a binary mixture of sheet ice, which flows by viscous creep deformation, and stream ice, which flows by decoupled sliding and/or sediment deformation at the bed. Dynamic and thermal evolutions are solved for each component in the mixture, with coupling rules to govern transfer between flow regimes. These transfers represent the activation, growth, and deactivation of ice streams, manifest by creep exchange and bed exchange of ice. I express the governing equations for mass, momentum, and energy balance in a form suitable for direct incorporation in existing numerical models of ice thermomechanics. The model is applied in simulations of an ice stream draining Hudson Strait and a large-scale surge lobe on the southern Laurentide margin. Ice stream vivacity is determined by the relative magnitudes of gravitational driving stress, longitudinal stress, marginal shear stress, and basal drag in the momentum balance. Sensitivity tests of poorly-constrained parameters in this stress balance permit a wide range of stream demeanors. Under simple thermal regulation of stream activation, internal flow oscillations arise over the physically-reasonable range of most free parameters. While simulated surge periodicities vary widely, bounds can be placed on meltwater and iceberg flux from Hudson Strait during a surge event. Through detailed characterization of the Laurentide bed, I compile subgrid terrain attributes of relevance to ice dynamics and explore geologic and topographic influences on fast flow. I also introduce a bed thermal model which tracks permafrost evolution, refining the calculation of basal energy balance which is integral to thermal facilitation of fast flow. Collectively, this work represents initial steps toward an improved description of subglacial conditions, ice stream mechanics, and fast-flow instabilities in a large-scale ice sheet model.
Ανάπτυξη τεχνητής νοημοσύνης για παιχνίδι στρατηγικής πραγματικού χρόνου:
Creators: name: Γιανταμίδης, Γεώργιος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Τεχνητή Νοημοσύνη
StarCraft
bot
Artificial Intelligence

description: Στην παρούσα εργασία θα δούμε πως μπορούμε να φτιάξουμε ένα bot για το StarCraft, δηλαδή ένα πρόγραμμα το οποίο μπορε.ί να παίζει StarCraft στη θέση μας (το StarCraft είναι ένα πολύ δημοφιλές παιχνίδι στρατηγικής πραγματικού χρόνου για Η/Υ). Αρχικά, θα πούμε λίγα λόγια για τη διαδικασία ανάπτυξης του bot, έπειτα λίγα λόγια για το παιχνίδι, και στη συνέχεια θα δούμε αναλυτικά τις τεχνικές και τους αλγορίθμους που χρησιμοποιήθηκαν, καθώς και πώς ακριβώς χρησιμοποιήθηκαν. Τέλος, παρουσιάζουμε τον κώδικα του προγράμματος, αρχικά περιγράφοντας συνοπτικά το ρόλο του κάθε κομματιού, και έπειτα αναλύοντας κάποιες use-cases (περιπτώσεις χρήσης), δηλαδή βλέποντας βήμα προς βήμα «Τι συμβαίνει όταν θέλω να κάνω αυτό;».
description: In the present project, we will see how one can write a bot for StarCraft, that is, a program that can play StarCraft on its own (StarCraft is a very popular real time strategy game for PCs). At first, we will talk a bit about the bot developing process, then about the game, and afterwards we will examine the techniques and algorithms used, as well as the exact way they were used. Finally, the code of the program is presented. At first, the role of each part is described briefly, and then a couple of use-cases are analyzed. That is, we examine step by step “What happens when I want to do this?”.
Smoothing problem in anticipating scenario
Creators: name: Dorogovtsev, Andrey A
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H05, 60H40

description: This article is devoted to the stochastic anticipating equations with the extended stochastic integral with respect to the Gaussian processes of a special type and its application to the smoothing problem in the case when noise is represented by the two jointly Gaussian Wiener processes, which can have not a semimartingale property with respect to the joint filtration.
description: 22 pages
The challenge of measuring and mapping the missing baryons
Creators: name: Driver, Simon P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The missing baryon problem may now be resolved, but the exact location and physical properties of the diffuse component remains unclear. This problem could be tractable, but requires the combination of new galaxy redshift surveys with new X-ray and radio facilities.
description: Published as a Comment in Nature Astronomy, August 2021, see also supporting article in Nature Portfolio: https://astronomycommunity.nature.com/videos/waves-deep
Rapidly rotating $Δ$-resonance-admixed hypernuclear compact stars
Creators: name: Li, Jia Jie
name: Sedrakian, Armen
name: Weber, Fridolin
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We use a set of hadronic equations of state derived from covariant density functional theory to study the impact of their high-density behavior on the properties of rapidly rotating $Δ$-resonance-admixed hyperonic compact stars. In particular, we explore systematically the effects of variations of the bulk energy isoscalar skewness, $Q_{\mathrm{sat}}$, and the symmetry energy slope, $L_{\mathrm{sym}}$, on the masses of rapidly rotating compact stars. With models for equation of state satisfying all the modern astrophysical constraints, excessively large gravitational masses of around $2.5 \, M_{\odot}$ are only obtained under three conditions: (a) strongly attractive $Δ$-resonance potential in nuclear matter, (b) maximally fast (Keplerian) rotation, and (c) parameter ranges $Q_{\mathrm{sat}}\gtrsim500$ MeV and $L_{\mathrm{sym}}\lesssim50$ MeV. These values of $Q_{\mathrm{sat}}$ and $L_{\mathrm{sym}}$ have a rather small overlap with a large sample (total of about 260) parametrizations of covariant nucleonic density functionals. The extreme nature of requirements (a)-(c) reinforces the theoretical expectation that the secondary object involved in the GW190814 event is likely to be a low-mass black hole rather than a supramassive neutron star.
description: 8 pages with 5 figures, matches published version
Multiple transitions of the spin configuration in quantum dots
Creators: name: Rogge, M. C.
name: Fuhner, C.
name: Haug, R. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Single electron tunneling is studied in a many electron quantum dot in high magnetic fields. For such a system multiple transitions of the spin configuration are theoretically predicted. With a combination of spin blockade and Kondo effect we are able to detect five regions with different spin configurations. Transitions are induced with changing electron numbers.
description: 4 pages, 5 figures