cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Απόψεις εκπαιδευτικών για τη λειτουργία και την αποτελεσματικότητα των Οχτακοσίων Ολοήμερων Δημοτικών Σχολείων με Ενιαίο Αναμορφωμένο Εκπαιδευτικό Πρόγραμμα:
Creators: name: Κεσίδου, Ναυσικά Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: εκπαιδευτικός
Εκπαίδευση
Ολοήμερο Σχολείο
teacher
Education
All-day School

description: Το Ολοήμερο Σχολείο είναι ένας σημαντικός εκπαιδευτικός θεσμός που εφαρμόζεται στην Ελλάδα εδώ και αρκετά χρόνια. Η παρούσα εργασία ασχολείται με αυτόν τον θεσμό κι επικεντρώνεται στη μετεξέλιξή του, η οποία είναι τα Ολοήμερα Δημοτικά Σχολεία με Ενιαίο Αναμορφωμένο Εκπαιδευτικό Πρόγραμμα, προσπαθώντας να οδηγήσει σε κάποιες διαπιστώσεις αναφορικά με τον τρόπο οργάνωσης κι εφαρμογής του. Κεντρικός σκοπός της έρευνας είναι να διερευνηθούν οι απόψεις των εκπαιδευτικών, οι οποίοι εργάστηκαν σε αυτού του είδους τα Ολοήμερα Σχολεία κατά τη διάρκεια του πρώτου έτους εφαρμογής τους, σχετικά με τη λειτουργία και την αποτελεσματικότητά τους. Αρχικά, γίνεται ανασκόπηση της βιβλιογραφίας σχετικά με το θεσμό του Ολοήμερου Σχολείου, τόσο στην Ελλάδα όσο και στην υπόλοιπη Ευρώπη. Επίσης, εξετάζεται το θεωρητικό πλαίσιο, καθώς επίσης και η σχετική νομοθεσία που πλαισιώνει το θεσμό. Επιπλέον, γίνεται μια σύγκριση μεταξύ του νέου τύπου Ολοήμερων Σχολείων με τους προϋπάρχοντες, το Ολοήμερο Πειραματικό και το Ολοήμερο Προαιρετικό Δημοτικό Σχολείο. Τέλος, στο εμπειρικό κομμάτι παρατίθενται η αφετηρία, οι στόχοι, τα ερευνητικά ερωτήματα και η μεθοδολογία της έρευνας, καθώς και η ανάλυση των δεδομένων. Έπειτα, ακολουθεί η συζήτηση και η παρουσίαση των διαπιστώσεων που συμβάλλουν στην αποτίμηση του θεσμού.
description: All-day Primary Schools is an important institution which has been implemented in Greece for a long time. This paper focuses on this institution and on its evolution, which has resulted in the establishment of All-day Primary Schools with a Unified Reformed Education Curriculum. This paper constitutes an attempt for us to reach some conclusions about the way this institution has been organized and implemented. The main purpose of the research is to investigate the views of the teachers who worked in All-day Primary Schools with a Unified Reformed Education Curriculum in the first year of their implementation on their functionality and efficacy. In the beginning, there is a review of the bibliography related to the institution of All-day Schools both in Greece and the in the rest of the European countries. Moreover, there is a discussion about the relevant theoretical background as well as the legislation which surrounds this particular institution. Additionally, a comparison between the different types of All-day Schools takes place in the first part of this paper. Finally, in the second part of the paper, there is a citation of the starting point, goals, scientific inquiries, methodology, as well as the analysis of the data of this research. Then, there is a discussion about the findings of the research, which play an important role in the evaluation of the specific institution.
Hawking temperature from tunnelling formalism
Creators: name: Mitra, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It has recently been suggested that the attempt to understand Hawking radiation as tunnelling across black hole horizons produces a Hawking temperature double the standard value. It is explained here how one can obtain the standard value in the same tunnelling approach.
description: REVTeX, 3 pages; version accepted in Phys. Letters B
Μοναδιακή λογική πρώτης τάξης και ισοδύναμοι χαρακτηρισμοί της:
Creators: name: Χρηστίδης, Γρηγόρης Βασίλειου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Λογική
Πρώτης τάξης
Μοναδιακή
Logic
First order
Monadic

description: Στην εργασία αυτή θα ασχοληθούμε με την μελέτη κάποιων βασικών αποτελεσμάτων πρώτης τάξης πάνω σε γλώσσες με άπειρες ή πεπερασμένες λέξεις. Για τον σκοπό αυτό θα ασχοληθούμε με κάποιες έννοιες όπως είναι τα counter-free Büchi αυτόματα, οι star-free γλώσσες, οι απεριοδικές γλώσσες και η γραμμική χρονική λογική και με την βοήθεια κάποιων ενδιάμεσων αποτελεσμάτων θα αποδείξουμε το κεντρικό Θεώρημα που στην ουσία είναι το θέμα αυτής της εργασίας.
description: In the present contribution we treat first-order languages over finite and infinite words. We introduce the notion of a counter-free Büchi automaton and we relate counter-freeness to aperiodicity. We try to give a self-contained presentation of some of the principal characterizations of first-order definable languages This covers description with star-free expressions, recognizability by aperiodic monoids and definability in linear temporal logic. In some sense the main focus in our paper is the explanation of the theorem 1.1.
Higher-dimensional multifractal value sets for conformal infinite graph directed Markov systems
Creators: name: Kesseböhmer, Marc
name: Urbanski, Mariusz
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37C45, 28A80, 82B05

description: We give a description of the level sets in the higher dimensional multifractal formalism for infinite conformal graph directed Markov systems. If these systems possess a certain degree of regularity this description is complete in the sense that we identify all values with non-empty level sets and determine their Hausdorff dimension. This result is also partially new for the finite alphabet case.
description: 20 pages, 1 figure
Decoherence induced CPT violation and entangled neutral mesons
Creators: name: Bernabeu, J.
name: Mavromatos, Nick E.
name: Sarkar, Sarben
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss two classes of semi-microscopic theoretical models of stochastic space-time foam in quantum gravity and the associated effects on entangled states of neutral mesons, signalling an intrinsic breakdown of CPT invariance. One class of models deals with a specific model of foam, initially constructed in the context of non-critical (Liouville) string theory, but viewed here in the more general context of effective quantum-gravity models. The relevant Hamiltonian perturbation, describing the interaction of the meson with the foam medium, consists of off-diagonal stochastic metric fluctuations, connecting distinct mass eigenstates (or the appropriate generalisation thereof in the case of K-mesons), and it is proportional to the relevant momentum transfer (along the direction of motion of the meson pair). There are two kinds of CPT-violating effects in this case, which can be experimentally disentangled: one (termed ``omega-effect'') is associated with the failure of the indistinguishability between the neutral meson and its antiparticle, and affects certain symmetry properties of the initial state of the two-meson system; the second effect is generated by the time evolution of the system in the medium of the space-time foam, and can result in time-dependent contributions of the $omega-effect type in the time profile of the two meson state. Estimates of both effects are given, which show that, at least in certain models, such effects are not far from the sensitivity of experimental facilities available currently or in the near future. The other class of quantum gravity models involves a medium of gravitational fluctuations which behaves like a ``thermal bath''. In this model both of the above-mentioned intrinsic CPT violation effects are not valid.
description: 16 pages revtex, no figures
Novel Technique for Volatile Optical Memory Using Solitons
Creators: name: Abubakr, Mohd
name: Vinay, R. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Recent advances in optics have shown that solitons have a great potential for upgrading the future optical systems which demand fast and reliable data transfer. Along side Different architectures have evolved to realize an optical computer. Due to difference in processing speeds of optical and electronic devices and usage of opto-electronic converters the efficiency of the optical computers is affected. In this paper we bring a novel technique for volatile optical memory using solitons which would be part of realizing an optical computer. Also the principle of read and write operations in the soliton based volatile memory systems is shown.
description: 4 pages
Behavior of solitary waves of coupled nonlinear Schrödinger equations subjected to complex external periodic potentials with anti-$\mathcal{PT}$ symmetry
Creators: name: Charalampidis, Efstathios G.
name: Cooper, Fred
name: Dawson, John F.
name: Khare, Avinash
name: Saxena, Avadh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We discuss the response of both moving and trapped solitary wave solutions of a nonlinear two-component nonlinear Schrödinger system in 1+1 dimensions to an anti-$\mathcal{PT}$ external periodic complex potential. The dynamical behavior of perturbed solitary waves is explored by conducting numerical simulations of the nonlinear system and using a collective coordinate variational approximation. We present case examples corresponding to choices of the parameters and initial conditions involved therein. The results of the collective coordinate approximation are compared against numerical simulations where we observe qualitatively good agreement between the two. Unlike the case for a single-component solitary wave in a complex periodic $\mathcal{PT}$-symmetric potential, the collective coordinate equations do not have a small oscillation regime, and initially the height of the two components changes in opposite directions often causing instability. We find that the dynamic stability criteria we have used in the one-component case is proven to be a good indicator for the onset of dynamic instabilities in the present setup.
description: 28 pages, 7 figures
Ειλεακή πεπτικότητα ενέργειας αζωτούχων ουσιών και αμινοξέων σπερμάτων κτηνοτροφικού κουκιού σε κρεοπαραγωγά ορνίθια:
Creators: name: Κιάνας, Στέργιος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: σπέρματα κτηνοτροφικού κουκιού «Πολυκάρπη»
κρεοπαραγωγά ορνίθια
ειλεακή πεπτικότητα
fava bean seeds “Polykarpi
broiler chickens
ileal digestibility

description: Σκοπός της εργασίας αυτής ήταν ο προσδιορισμός της ειλεακής πεπτικότητας των αζωτούχων ουσιών και των αμινοξέων σπερμάτων μιας ελληνικής ποικιλίας κτηνοτροφικού κουκιού με κρεοπαραγωγά ορνίθια. Στο πείραμα χρησιμοποιήθηκαν ένα βασικό σιτηρέσιο (Μ, μάρτυρας) και δύο ακόμη σιτηρέσια, τα οποία περιείχαν αλεσμένα σπέρματα κτηνοτροφικού κουκιού «Πολυκάρπη» σε ποσότητες 150 και 300g/kg. Η προσθήκη αλεσμένων σπερμάτων κουκιού στα σιτηρέσια έγινε με ισόποση αντικατάσταση αμύλου αραβοσίτου. Κατ’ αυτόν τον τρόπο οι διαφορές στην περιεκτικότητα πρωτεΐνης και αμινοξέων μεταξύ των σιτηρεσίων οφείλονταν αποκλειστικά στη συμμετοχή των σπερμάτων του κτηνοτροφικού κουκιού. Τριοξείδιο του χρωμίου (Cr2O3) προστέθηκε στα σιτηρέσια ως άπεπτος δείκτης.
description: The aim of this studywas the determination of crude protein (CP) and amino acid (AA) ileal digestibility of a local cultivar of fava bean (FB) seeds in broiler chickens. Three experimental diets were used; a basal (B) and two others including FB seeds of the Greek cultivar “Plykarpi” at inclusion levels of either 150 or 300 g/kg, substituting equal amounts of maize starch. Hence, the differences in dietary CP and AA concentrations resulted only from the inclusion of FB seeds. Chromium trioxide (Cr2O3) was included as an indigestible marker in this ileal digestibility experiment.
Analysis of magnetic polarities in active regions for the prediction of solar flares
Creators: name: Hernández, N. Granados
name: Domínguez, S. Vargas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Solar active regions and the processes that occur in them have been extensively studied and analyzed and many types of models and characterizations have been proposed for the occurrence of different eruptive events that take place in the solar atmosphere. The most characteristic of these regions are those that have opposite magnetic polarity, which, in their majority, generate explosive events such as the so-called solar flares. The flares are intense explosions occurring in the solar atmosphere with adverse effects on the Earth and the technology developed by humans, and they are also determining factors in the so-called space weather. For this reason, attempts have been made to predict the occurrence of these events. In the present study, we developed a predictive model of solar flares higher than M5 based on the articles proposed by Korsos, et al. (2014, 2015) using the relationship between the flares and the bipolar active regions. The analysis took into account the areas of the umbrae of opposite polarity, their average magnetic field, and the magnetic barycenter from each sunspot in the region for a sample of three active regions to find the temporal variation due to the evolution of the sunspots, thus confirming previous results reported in the literature. We made a statistical analysis to determine whether after a flare occurs, another can arise in the subsequent hours.
description: 12 pages, 7 figures, 7 tables (in spanish)
Early-life Income Shocks and Old-Age Cause-Specific Mortality
Creators: name: NoghaniBehambari, Hamid
name: Noghani, Farzaneh
name: Tavassoli, Nahid
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Economics (econ.GN)
subject: FOS: Economics and business

description: This paper investigates the causal relationship between income shocks during the first years of life and adulthood mortality due to specific causes of death. Using all death records in the United States during 1968-2004 for individuals who were born in the first half of the 20th century, we document a sizable and statistically significant association between income shocks early in life, proxied by GDP per capita fluctuations, and old age cause-specific mortality. Conditional on individual characteristics and controlling for a broad array of current and early-life conditions, we find that a 1 percent decrease in the aggregate business cycle in the year of birth is associated with 2.2, 2.3, 3.1, 3.7, 0.9, and 2.1 percent increase in the likelihood of mortality in old ages due to malignant neoplasms, Diabetes Mellitus, cardiovascular diseases, Influenza, chronic respiratory diseases, and all other diseases, respectively.
Black Holes in Higher-Dimensional Gravity
Creators: name: Obers, Niels A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: These lectures review some of the recent progress in uncovering the phase structure of black hole solutions in higher-dimensional vacuum Einstein gravity. The two classes on which we focus are Kaluza-Klein black holes, i.e. static solutions with an event horizon in asymptotically flat spaces with compact directions, and stationary solutions with an event horizon in asymptotically flat space. Highlights include the recently constructed multi-black hole configurations on the cylinder and thin rotating black rings in dimensions higher than five. The phase diagram that is emerging for each of the two classes will be discussed, including an intriguing connection that relates the phase structure of Kaluza-Klein black holes with that of asymptotically flat rotating black holes.
description: latex, 49 pages, 5 figures. Lectures to appear in the proceedings of the Fourth Aegean Summer School, Mytiline, Lesvos, Greece, September 17-22, 2007
The K2 Galactic Archaeology Program Data Release 2: Asteroseismic results from campaigns 4, 6, & 7
Creators: name: Zinn, Joel C.
name: Stello, Dennis
name: Elsworth, Yvonne
name: García, Rafael A.
name: Kallinger, Thomas
name: Mathur, Savita
name: Mosser, Benoît
name: Bugnet, Lisa
name: Jones, Caitlin
name: Hon, Marc
name: Sharma, Sanjib
name: Schönrich, Ralph
name: Warfield, Jack T.
name: Luger, Rodrigo
name: Pinsonneault, Marc H.
name: Johnson, Jennifer A.
name: Huber, Daniel
name: Aguirre, Victor Silva
name: Chaplin, William J.
name: Davies, Guy R.
name: Miglio, Andrea
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Studies of Galactic structure and evolution have benefitted enormously from Gaia kinematic information, though additional, intrinsic stellar parameters like age are required to best constrain Galactic models. Asteroseismology is the most precise method of providing such information for field star populations $\textit{en masse}$, but existing samples for the most part have been limited to a few narrow fields of view by the CoRoT and Kepler missions. In an effort to provide well-characterized stellar parameters across a wide range in Galactic position, we present the second data release of red giant asteroseismic parameters for the K2 Galactic Archaeology Program (GAP). We provide $ν_{\mathrm{max}}$ and $Δν$ based on six independent pipeline analyses; first-ascent red giant branch (RGB) and red clump (RC) evolutionary state classifications from machine learning; and ready-to-use radius & mass coefficients, $κ_R$ & $κ_M$, which, when appropriately multiplied by a solar-scaled effective temperature factor, yield physical stellar radii and masses. In total, we report 4395 radius and mass coefficients, with typical uncertainties of $3.3\% \mathrm{\ (stat.)} \pm 1\% \mathrm{\ (syst.)}$ for $κ_R$ and $7.7\% \mathrm{\ (stat.)} \pm 2\% \mathrm{\ (syst.)}$ for $κ_M$ among RGB stars, and $5.0\% \mathrm{\ (stat.)} \pm 1\% \mathrm{\ (syst.)}$ for $κ_R$ and $10.5\% \mathrm{\ (stat.)} \pm 2\% \mathrm{\ (syst.)}$ for $κ_M$ among RC stars. We verify that the sample is nearly complete -- except for a dearth of stars with $ν_{\mathrm{max}} \lesssim 10-20μ$Hz -- by comparing to Galactic models and visual inspection. Our asteroseismic radii agree with radii derived from Gaia Data Release 2 parallaxes to within $2.2 \pm 0.3\%$ for RGB stars and $2.0 \pm 0.6\%$ for RC stars.
description: Published in ApJS
Experimental Evidence for Efimov Quantum States
Creators: name: Naegerl, H. -C.
name: Kraemer, T.
name: Mark, M.
name: Waldburger, P.
name: Danzl, J. G.
name: Engeser, B.
name: Lange, A. D.
name: Pilch, K.
name: Jaakkola, A.
name: Chin, C.
name: Grimm, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Three interacting particles form a system which is well known for its complex physical behavior. A landmark theoretical result in few-body quantum physics is Efimov's prediction of a universal set of weakly bound trimer states appearing for three identical bosons with a resonant two-body interaction. Surprisingly, these states even exist in the absence of a corresponding two-body bound state and their precise nature is largely independent of the particular type of the two-body interaction potential. Efimov's scenario has attracted great interest in many areas of physics; an experimental test however has not been achieved. We report the observation of an Efimov resonance in an ultracold thermal gas of cesium atoms. The resonance occurs in the range of large negative two-body scattering lengths and arises from the coupling of three free atoms to an Efimov trimer. We observe its signature as a giant three-body recombination loss when the strength of the two-body interaction is varied near a Feshbach resonance. This resonance develops into a continuum resonance at non-zero collision energies, and we observe a shift of the resonance position as a function of temperature. We also report on a minimum in the recombination loss for positive scattering lengths, indicating destructive interference of decay pathways. Our results confirm central theoretical predictions of Efimov physics and represent a starting point from which to explore the universal properties of resonantly interacting few-body systems.
description: 8 pages, 4 figures, Proceedings of ICAP-2006 (Innsbruck)
Angularities and other shapes
Creators: name: Magnea, Lorenzo
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I discuss soft-gluon resummation and power corrections for event shape distributions, mostly in e+ e- annihilation. I consider specifically the thrust, the C parameter, and the class of angularities, and show how factorization techniques and dressed gluon exponentiation lead to predictive models of power corrections that are firmly grounded in perturbative QCD. The scaling rule for the shape function for angularities is derived as an example. Finally, I make a few remarks on possible generalizations to hadron collisions, and on their relevance to LHC studies.
description: 10 pages, contribution to the FRIF workshop on first principles non-perturbative QCD of hadron jets, LPTHE, Paris, France, 12-14 Jan 2006
Spiral anchoring in anisotropic media with multiple inhomogeneities: a dynamical system approach
Creators: name: Boily, Patrick
Publisher: name: arXiv
Year: 2006
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 34C20, 37G40, 37L10, 37N25, 92E20

description: Various PDE models have been suggested in order to explain and predict the dynamics of spiral waves in excitable media. In two landmark papers, Barkley noticed that some of the behaviour could be explained by the inherent Euclidean symmetry of these models. LeBlanc and Wulff then introduced forced Euclidean symmetry-breaking (FESB) to the analysis, in the form of individual translational symmetry-breaking (TSB) perturbations and rotational symmetry-breaking (RSB) perturbations; in either case, it is shown that spiral anchoring is a direct consequence of the FESB. In this article, we provide a characterization of spiral anchoring when two perturbations, a TSB term and a RSB term, are combined, where the TSB term is centered at the origin and the RSB term preserves rotations by multiples of $\frac{2π}{\jmath^*}$, where $\jmath^*\geq 1$ is an integer. When $\jmath^*>1$ (such as in a modified bidomain model), it is shown that spirals anchor at the origin, but when $\jmath^* =1$ (such as in a planar reaction-diffusion-advection system), spirals generically anchor away from the origin.
description: Revised version
Classification of linear operators satisfying $(Au,v)=(u,A^rv)$ or $(Au,A^rv)=(u,v)$ on a vector space with indefinite scalar product
Creators: name: Borges, Victor Senoguchi
name: Kashuba, Iryna
name: Sergeichuk, Vladimir V.
name: Sodré, Eduardo Ventilari
name: Zaidan, André
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 15A21, 15A63, 15B57, 46C20, 47B50

description: We classify all linear operators $A:V\to V$ satisfying $(Au,v)=(u,A^rv)$ and all linear operators satisfying $(Au,A^rv)=(u,v)$ with $r=2,3,\dots$ on a complex, real, or quaternion vector space with scalar product given by a nonsingular symmetric, skew-symmetric, Hermitian, or skew-Hermitian form.
Exploring the X-ray spectral variability of MCG-6-30-15 with XMM-Newton
Creators: name: Larsson, J.
name: Fabian, A. C.
name: Miniutti, G.
name: Ross, R. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a study of the spectral variability of the Seyfert I galaxy MCG-6-30-15 based on the two long XMM-Newton observations from 2000 and 2001. The X-ray spectrum and variability properties of the 2001 data have previously been well described with a two-component model consisting of a variable power law and a much less variable reflection component, containing a broad relativistic iron line from the accretion disc around a rapidly rotating Kerr black hole. The lack of variability of the reflection component has been interpreted as an effect of strong gravitational light bending very close to the central black hole. Using an improved reflection model, we fit the two-component model to time-resolved spectra of both observations. Assuming that the photon index of the power law is constant we reconfirm the old result and show that this does not depend on the time-scale of the analysis.
description: 6 pages, 7 figures, accepted by MNRAS
ERICC Technical Brief _ Diversity and Fragmentation of Myanmar Education: Schooling Shaped by Protracted Conflict and Crisis
Creators: name: ERICC Consortium
name: Rinehart, Gray
name: Pherali, Tejendra
name: Chase, Elaine
name: Zaw, Htet Thiha
name: Naing, Thein
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390201
subject: Education policy

description: This technical brief highlights key findings from a detailed report of a rigorous review of the existing body of research in education in the conflict-affected context of Myanmar: Diversity and Fragmentation of Myanmar Education: Schooling Shaped by Protracted Conflict and Crisis (Rinehart et al, 2024). Myanmar’s history since its independence in 1948 has been characterised predominantly by political instability and violent internal conflicts involving ethnic armed organisations (EAOs) and the Myanmar military. As a result of the 2021 coup, 98% of Myanmar children, including approximately 11.4 million school-aged children, are affected by the ongoing crisis. Over 3.5 million are out-of-school and 6.5 million are experiencing learning deprivation despite attending school (Valenza and Stoff, 2023). Schools have been caught in the conflicts between armed resistance actors and the State Administration Council (SAC) military junta. Moreover, educational provisions have become heavily politicised, often used to serve the ideologies and political visions of different armed groups, making education a victim of political controversies as well as the ongoing violence. There is an urgent need for a robust evidence base to help education providers – and those that support them – navigate the barriers to education and mitigate disruptions to teaching and learning amid ongoing violence. This review draws upon relevant studies conducted since 2000 as well as complementary findings from journalistic writing and key informant interviews conducted in 2024. It organises, describes and analyses the current evidence base for education in Myanmar and identifies evidence gaps for future research. It looks primarily at three educational settings affected by conflict and crisis contexts: non-state ethnic minority education provided by various actors in areas contested by or under the control of different EAOs, operating in parallel to the central state education system;  refugee education provided in the nine refugee camps on the Thailand side of Myanmar’s border, overseen by two ethnic minority refugee committees (Karen and Karenni); and  migrant education in Thailand’s Tak Province, consisting of over 60 learning centres for
Multifractal analysis of Birkhoff averages on "self-affine" symbolic spaces
Creators: name: Barral, Julien
name: Mensi, Mounir
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 28A78, 28A80 (Primary); 37D35, 37D40 (Secondary)

description: We achieve on self-affine Sierpinski carpets the multifractal analysis of the Birkhoff averages of potentials satisfying a Dini condition. Given such a potential, the corresponding Hausdorff spectrum cannot be deduced from that of the associated Gibbs measure by a simple transformation. Indeed, these spectra are respectively obtained as the Legendre transform of two distinct concave differentiable functions that cannot be deduced from one another by a dilation and a translation. This situation is in contrast with what is observed in the familiar self-similar case. Our results are presented in the framework of almost-multiplicative functions on products of two distinct symbolic spaces and their projection on the associated self-affine carpets.
Book Review of Stephen L. Adler's, "Quantum theory as an emergent phenomenon."
Creators: name: Pearle, Philip
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In Stephen Adler's book, "Quantum theory as an emergent phenomenon," the author starts from a classical mechanics structure and "derives" the formalism of quantum theory, together with wave function collapse dynamics, the latter providing the interpretation of quantum theory. A detailed outline of the author's argument is presented in this book review.
description: 8 pages
The Electron Energy Distribution in the Hotspots of Cygnus A: Filling the Gap with the Spitzer Space Telescope
Creators: name: Stawarz, L.
name: Cheung, C. C.
name: Harris, D. E.
name: Ostrowski, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Here we present Spitzer Space Telescope imaging of Cyg A with the Infrared Array Camera, resulting in the detection of the high-energy tails or cut-offs in the synchrotron spectra for all four hotspots of this archetype radio galaxy. When combined with the other data collected from the literature, our observations allow for detailed modeling of the broad-band emission for the brightest spots A and D. We confirm that the X-ray flux detected previously from these features is consistent with the synchrotron self-Compton radiation for the magnetic field intensity 170 muG in spot A, and 270 muG in spot D. We also find that the energy density of the emitting electrons is most likely larger by a factor of a few than the energy density of the hotspots' magnetic field. We construct energy spectra of the radiating ultrarelativistic electrons. We find that for both hotspots A and D these spectra are consistent with a broken power-law extending from at least 100 MeV up to 100 GeV, and that the spectral break corresponds almost exactly to the proton rest energy of 1 GeV. We argue that the shape of the electron continuum reflects two different regimes of the electron acceleration process at mildly relativistic shocks, rather than resulting from radiative cooling and/or absorption effects. In this picture the protons' inertia defines the critical energy for the hotspot electrons above which Fermi-type acceleration processes may play a major role, but below which the operating acceleration mechanism has to be of a different type. At energies >100 GeV, the electron spectra cut-off/steepen again, most likely as a result of spectral aging due to radiative loss effects. We discuss several implications of the presented analysis for the physics of extragalactic jets.
description: 29 pages, 8 figures and 2 tables included. Accepted for publication in ApJ
A summary on an investigation of GAGG:Ce afterglow emission in the context of future space applications within the HERMES nanosatellite mission
Creators: name: Dilillo, G.
name: Campana, R.
name: Zampa, N.
name: Fuschino, F.
name: Pauletta, G.
name: Rashevskaya, I.
name: Ambrosino, F.
name: Baruzzo, M.
name: Cauz, D.
name: Cirrincione, D.
name: Citossi, M.
name: Della Casa, G.
name: Di Ruzza, B.
name: Galgoczi, G.
name: Labanti, C.
name: Evangelista, Y.
name: Ripa, J.
name: Vacchi, A.
name: Tommasino, F.
name: Verroi, E.
name: Fiore, F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: GAGG:Ce (Cerium-doped Gadolinium Aluminium Gallium Garnet) is a promising new scintillator crystal. A wide array of interesting features, such as high light output, fast decay times, almost non-existent intrinsic background and robustness, make GAGG:Ce an interesting candidate as a component of new space-based gamma-ray detectors. As a consequence of its novelty, literature on GAGG:Ce is still lacking on points crucial to its applicability in space missions. In particular, GAGG:Ce is characterized by unusually high and long-lasting delayed luminescence. This afterglow emission can be stimulated by the interactions between the scintillator and the particles of the near-Earth radiation environment. By contributing to the noise, it will impact the detector performance to some degree. In this manuscript we summarize the results of an irradiation campaign of GAGG:Ce crystals with protons, conducted in the framework of the HERMES-TP/SP (High Energy Rapid Modular Ensemble of Satellites - Technological and Scientific Pathfinder) mission. A GAGG:Ce sample was irradiated with 70 MeV protons, at doses equivalent to those expected in equatorial and sun-synchronous Low-Earth orbits over orbital periods spanning 6 months to 10 years, time lapses representative of satellite lifetimes. We introduce a new model of GAGG:Ce afterglow emission able to fully capture our observations. Results are applied to the HERMES-TP/SP scenario, aiming at an upper-bound estimate of the detector performance degradation due to the afterglow emission expected from the interaction between the scintillator and the near-Earth radiation environment.
description: 8 pages, 3 figures. Proceedings of SPIE "Astronomical Telescopes and Instrumentation" 2020
Multivariate Polya-Schur classification problems in the Weyl algebra
Creators: name: Borcea, Julius
name: Brändén, Petter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 47D03 (Primary), 15A15, 26C10, 30C15, 30D15, 32A60, 46E22, 47B38, 93D05 (Secondary)

description: A multivariate polynomial is {\em stable} if it is nonvanishing whenever all variables have positive imaginary parts. We classify all linear partial differential operators in the Weyl algebra $\A_n$ that preserve stability. An important tool that we develop in the process is the higher dimensional generalization of Pólya-Schur's notion of multiplier sequence. We characterize all multivariate multiplier sequences as well as those of finite order. Next, we establish a multivariate extension of the Cauchy-Poincaré interlacing theorem and prove a natural analog of the Lax conjecture for real stable polynomials in two variables. Using the latter we describe all operators in $\A_1$ that preserve univariate hyperbolic polynomials by means of determinants and homogenized symbols. Our methods also yield homotopical properties for symbols of linear stability preservers and a duality theorem showing that an operator in $\A_n$ preserves stability if and only if its Fischer-Fock adjoint does. These are powerful multivariate extensions of the classical Hermite-Poulain-Jensen theorem, Pólya's curve theorem and Schur-Maló-Szegő composition theorems. Examples and applications to strict stability preservers are also discussed.
description: To appear in Proc. London Math. Soc; 33 pages, 4 figures, LaTeX2e
Trees, functional equations, and combinatorial Hopf algebras
Creators: name: Hivert, Florent
name: Novelli, Jean-Christophe
name: Thibon, Jean-Yves
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: One of the main virtues of trees is to represent formal solutions of various functional equations which can be cast in the form of fixed point problems. Basic examples include differential equations and functional (Lagrange) inversion in power series rings. When analyzed in terms of combinatorial Hopf algebras, the simplest examples yield interesting algebraic identities or enumerative results.
description: 14 pages, LaTEX
Axis potentials for stationary $n$-black-hole configurations
Creators: name: Hennig, Jörg
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We extend earlier discussions of the balance problem for two black holes and study stationary spacetimes containing an arbitrary number of $n$ aligned rotating and (possibly) charged black holes. For these hypothetical equilibrium configurations, we obtain the most general form of the boundary data on the symmetry axis in terms of a finite number of parameters. Hence future investigations of $n$-black-hole configurations can be restricted to studying properties of these finite families of solutions.
description: 9 pages, 1 figure, accepted for publication in Class. Quantum Grav
When Deep Learning Meets Digital Image Correlation
Creators: name: Boukhtache, S.
name: Abdelouahab, K.
name: Berry, F.
name: Blaysat, B.
name: Grediac, M.
name: Sur, F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Image and Video Processing (eess.IV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: I.2.m; I.4.m; J.2
subject: 74-05

description: Convolutional Neural Networks (CNNs) constitute a class of Deep Learning models which have been used in the recent past to resolve many problems in computer vision, in particular optical flow estimation. Measuring displacement and strain fields can be regarded as a particular case of this problem. However, it seems that CNNs have never been used so far to perform such measurements. This work is aimed at implementing a CNN able to retrieve displacement and strain fields from pairs of reference and deformed images of a flat speckled surface, as Digital Image Correlation (DIC) does. This paper explains how a CNN called StrainNet can be developed to reach this goal, and how specific ground truth datasets are elaborated to train this CNN. The main result is that StrainNet successfully performs such measurements, and that it achieves competing results in terms of metrological performance and computing time. The conclusion is that CNNs like StrainNet offer a viable alternative to DIC, especially for real-time applications.
description: 35 pages, 25 figures. Accepted for publication in Optics and Lasers in Engineering on July 9, 2020
Ανάπτυξη φθορισμομετρικής μεθόδου για τον προσδιορισμό φαρμακευτικά δραστικών αμινών με την τεχνική των διαδοχικών εγχύσεων και χρήση της ο-φθαλαδιαλδεΰδης ως αντιδραστηρίου παραγωγοποίησης:
Creators: name: Παπαδημητρίου, Σοφία Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Αμίνες
Φθορισμομετρία
SIA
Amines
OPA

description: Στην εργασία αυτή περιγράφεται η ανάπτυξη, βελτιστοποίηση, επικύρωση και εφαρμογή μιας αυτόματης αναλυτικής μεθόδου για τον προσδιορισμό τριών φαρμακευτικά δραστικών αμινών και πιο συγκεκριμένα της αμανταδίνης (ΑΜΑ), της μεμαντίνης (ΜΕΜ) και της ριμανταδίνης (RIM) με την τεχνική των διαδοχικών εγχύσεων (SIA). Η μέθοδος βασίζεται στην αντίδραση των προσδιοριζόμενων συστατικών με την ο-φθαλαδιαλδεΰδη (ΟΡΑ) σε αλκαλικό περιβάλλον, παρουσία Ν-ακετυλοκυστεΐνης (NAC). Τα παράγωγα που δημιουργούνται προσδιορίζονται φθορισμομετρικά (λex_340 nm /λem_455 nm). Μελετήθηκαν και βελτιστοποιήθηκαν οι βασικές χημικές (pH, συγκεντρώσεις ποσότητας της ΟΡΑ και της NAC) και γεωμετρικές παράμετροι (χρόνος αναχαίτισης στο σπείραμα αντίδρασης, όγκοι δειγμάτων και αντιδραστηρίων). Η προτεινόμενη μέθοδος επικυρώθηκε ως προς το εύρος προσδιορισμού, τα όρια ανίχνευσης και ποσοτικού προσδιορισμού, την επαναληψιμότητα, την εκλεκτικότητα, την ανθεκτικότητα και την ακρίβεια. Η προτεινόμενη μέθοδος εφαρμόστηκε με επιτυχία στον έλεγχο ποιότητας εμπορικά διαθέσιμων φαρμακευτικών σκευασμάτων (πρωτότυπων και γενόσημων).
description: The present thesis reports the development, optimization, validation and application of an automated method for the determination of three pharmaceutically active amines, namely amantadine (AMA), mementine (MEM) and rimantadine (RIM) using sequential injection analysis as analytical technique. The method is based on the reaction of the analytes with ophthalaldehyde (OPA) in basic medium in the presence of N-acetylcysteine (NAC). The formed derivatives are monitored fluorimetricaly (λex _340 nm/λem _455 nm). All major chemical (pH, amount concentrations of OPA and NAC) and instrumental variables (samples and reagents volumes, stop flow time in the reaction coil) that affect the determination were studied and optimized. The proposed method was validated in terms of range, limits of detection and quantitation, precision, accuracy, selectivity and robustness. The method was applied successfully to the quality control of commercially available pharmaceutical formulations (prototypes and generics).
High fidelity transfer of an arbitrary quantum state between harmonic oscillators
Creators: name: Jahne, K.
name: Yurke, B.
name: Gavish, U.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: It is shown that by switching a specific time-dependent interaction between a harmonic oscillator and a transmission line (a waveguide, an optical fiber, etc.) the quantum state of the oscillator can be transferred into that of another oscillator coupled to the distant other end of the line, with a fidelity that is independent of the initial state of both oscillators. For a transfer time $T$, the fidelity approaches 1 exponentially in $γT$ where $γ$ is a characteristic damping rate. Hence, a good fidelity is achieved even for a transfer time of a few damping times. Some implementations are discussed.
description: 4 pages, 1 figure
Aether Compactification
Creators: name: Carroll, Sean M.
name: Tam, Heywood
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a new way to hide extra dimensions without invoking branes, based on Lorentz-violating tensor fields with expectation values along the extra directions. We investigate the case of a single vector ``aether'' field on a compact circle. In such a background, interactions of other fields with the aether can lead to modified dispersion relations, increasing the mass of the Kaluza-Klein excitations. The mass scale characterizing each Kaluza-Klein tower can be chosen independently for each species of scalar, fermion, or gauge boson. No small-scale deviations from the inverse square law for gravity are predicted, although light graviton modes may exist.
A software toolkit to simulate activation background for high energy detectors onboard satellites
Creators: name: Galgoczi, G.
name: Ripa, J.
name: Dilillo, G.
name: Ohno, M.
name: Campana, R.
name: Werner, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: A software toolkit for the simulation of activation background for high energy detectors onboard satellites is presented on behalf of the HERMES-SP collaboration. The framework employs direct Monte Carlo and analytical calculations allowing computations two orders of magnitude faster and more precise than a direct Monte Carlo simulation. The framework was developed in a way that the model of the satellite can be replaced easily. Therefore the framework can be used for different satellite missions. As an example, the proton induced activation background of the HERMES CubeSat is quantified.
description: 10 pages, 11 figures. Proceedings of SPIE "Astronomical Telescopes and Instrumentation" 2020
A simple parameterization to predict population characteristics of boundary-layer cumulus clouds
Creators: name: Berg, Larry Keith
Publisher: name: University of British Columbia
Year: 2009

description: Estimates of fair-weather cumulus size distributions are made from the joint frequency distribution (JFD) of virtual potential temperature (6V) vs height of the lifting condensation level (zLCL) collected from a single surface weather station. Conceptually, the JFD represents the likelihood that a parcel will rise and the likelihood that condensation will occur. The 6V and the zLCL for each point of the JFD can be compared to the mean 6V of the mixed layer. If the parcel has a 6V less than that of the mixed layer the parcel will not rise. If the parcel has a larger 6V the parcel will rise dry adiabatically. A subset of the these rising parcels will reach their zLCL and form clouds. These parcels will continue to rise, moist adiabatically, until they reach the stable layer above the convective mixed layer. Other rising parcels will not condense but will continue to rise, dry adiabatically, as clear air parcels until they reach the stable layer. The cloud model was designed to use a JFD measured near the top of the surface layer using fast-response instruments mounted on a research aircraft flying over a large area. It is very expensive to obtain surface-layer data using an aircraft. It would be desirable if a JFD based on inexpensive surface measurements could be used. These experiments will not only investigate the CuP model results, but will also determine if a less expensive JFD computed from a single surface weather station can be used instead. Using a JFD of 6V vs zLCL calculated from a single surface station, cloud ensemble estimates are compared to cloud measurements made at the Atmospheric Radiation Experiment (ARM) site in central Oklahoma during the spring and summer 1994 and 1995 intensive operations periods. There was some skill predicting the cloud-base height — in most cases the model estimates were bracketed by observations. No observations of cloud-thickness are made at the ARM site. However, model estimates of cloud-thickness are nearly log-normally distributed, consistent with observations by Lopez (1977) and Stull (1988). Using a JFD constructed from a single-surface station there is little skill predicting cloud cover.
Irreversible growth of binary mixtures on small-world networks
Creators: name: Candia, Julián
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Binary mixtures growing on small-world networks under far-from-equilibrium conditions are studied by means of extensive Monte Carlo simulations. For any positive value of the shortcut fraction of the network ($p>0$), the system undergoes a continuous order-disorder phase transition, while it is noncritical in the regular lattice limit ($p=0$). Using finite-size scaling relations, the phase diagram is obtained in the thermodynamic limit and the critical exponents are evaluated. The small-world networks are thus shown to trigger criticality, a remarkable phenomenon which is analogous to similar observations reported recently in the investigation of equilibrium systems.
description: 7 pages, 7 figures; added/removed references and modified presentation. To appear in PRE