cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
This too is math : making sense with a pre-schooler
Creators: name: Phillips, Marilyn Eileen
Publisher: name: University of British Columbia
Year: 2009

description: This thesis focuses on a mother's perceptions of her younger daughter's mathematical activity and thought, and how this view affects other areas in the mother's life. I am the mother, and Jaclyn (Jackie) is my daughter. How, when, and what mathematizing occurred in our home-life interactions is explored through the use of ethnographic case study methods. The data collection started when Jaclyn was three-and-a-half years old and continued until she was five-and-a-half, during which time I was a full-time teacher of 8- to 10-year-olds. The analysis, interpretation, and author reflections began immediately and continued long after the anecdotes were recorded. I provide explanatory glimpses of the mathematical relationships developed and explored by myself and my daughter as we created our ways of relating to each other and the world we both inhabit, particularly our home environment. I reflect upon these incidents to interpret them and to highlight the mathematical thinking and ways of mathematizing inherent in them, as well as to examine the mathematics that can develop out of them. This work offers an in-depth look at what 'found' mathematics is like in one child's home. Because the whole context of learning is a factor in how and what people learn, I provide descriptions of the learning situation and the relationship between myself and my daughter. Jaclyn's developing awareness of a social and mathematical world is communicated through her words and actions. These are described and interpreted through my perceptions. This study also looks at the multiple, and often invisible, interactions among the roles of mother, teacher, and researcher. I am all three, in different ways, at different times. Mediation strategies in the home usually reflect my sense of mothering, but on many occasions it is possible to see my sense of both teaching and researching informing the role of mother. On other occasions, the mother influences the thinking of the teacher/researcher. The reciprocity of attentive educational functioning in the home and in the school is worthy of notice. On many occasions, reflections about Jackie's words and/or actions elicited self-reflection on my teaching practice, and such reflection comprises one central element of the study.
New (im)possibilities for agriculture and domestic services in Poland and Italy? Navigating legal solutions and social organisations' support for Ukrainian women displaced by the full-scale invasion of Ukraine in 2022
Creators: name: Fedyuk, Olena
name: KYLIUSHYK, IVANNA
name: Lashchuk, Iuliia
Publisher: name: Zenodo
Year: 2024

description: Abstract

The aim of this report is to analyse the support provided to Ukrainian women in Poland and Italy displaced as a result of the full-scale Russian invasion of Ukraine in 2022. The analysis focuses on the actions taken by social actors in the agriculture and domestic services sectors. Both countries have been facing labour shortages in these sectors for some time, with the gaps traditionally filled by migrant workers, including a significant number of Ukrainian workers. The main research question is: what forms of support have been provided to forced migrant women from Ukraine in the agriculture and domestic services in Poland and Italy, and has the presence of this new group of migrants contributed to addressing the labour shortages in these sectors? The analysis is based on analysis of secondary sources and the authors’ own research findings. We argue that the needs of fleeing Ukrainian women (especially those with children and other dependents) differ significantly from the opportunities available in the agriculture and domestic services in Poland and Italy, characterised by such structural problems as the irregular and seasonal nature of work and working hours, substandard accommodation available for the workers and a lack of work–life balance opportunities. Consequently, there is a need for a more diversified approach to integrating Ukrainian migrant women into the labour markets of the receiving countries. Additionally, it is crucial to adapt legal solutions and implement deeper structural reforms in both sectors to ensure that migrants are protected effectively from exploitation. 

Keywords

war in Ukraine, forced migration, women, Poland, Italy, support, agriculture, domestic services
Growth of the number of geodesics between points and insecurity for riemannian manifolds
Creators: name: Burns, Keith
name: Gutkin, Eugene
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 37D40

description: A Riemannian manifold is said to be uniformly secure if there is a finite number $s$ such that all geodesics connecting an arbitrary pair of points in the manifold can be blocked by $s$ point obstacles. We prove that the number of geodesics with length $\leq T$ between every pair of points in a uniformly secure manifold grows polynomially as $T \to \infty$. We derive from this that a compact Riemannian manifold with no conjugate points whose geodesic flow has positive topological entropy is totally insecure: the geodesics between any pair of points cannot be blocked by a finite number of point obstacles.
description: 14 pages, 0 figures
Delta Hedged Option Valuation with Underlying Non-Gaussian Returns
Creators: name: Moriconi, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pricing of Securities (q-fin.PR)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: The standard Black-Scholes theory of option pricing is extended to cope with underlying return fluctuations described by general probability distributions. A Langevin process and its related Fokker-Planck equation are devised to model the market stochastic dynamics, allowing us to write and formally solve the generalized Black-Scholes equation implied by dynamical hedging. A systematic expansion around a non-perturbative starting point is then implemented, recovering the Matacz's conjectured option pricing expression. We perform an application of our formalism to the real stock market and find clear evidence that while past financial time series can be used to evaluate option prices before the expiry date with reasonable accuracy, the stochastic character of volatility is an essential ingredient that should necessarily be taken into account in analytical option price modeling.
description: Four pages; two eps figures
Solving Open String Field Theory with Special Projectors
Creators: name: Rastelli, Leonardo
name: Zwiebach, Barton
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Schnabl recently found an analytic expression for the string field tachyon condensate using a gauge condition adapted to the conformal frame of the sliver projector. We propose that this construction is more general. The sliver is an example of a special projector, a projector such that the Virasoro operator Ł_0 and its BPZ adjoint Ł*_0 obey the algebra [Ł_0, Ł*_0] = s (Ł_0 + Ł*_0), with s a positive real constant. All special projectors provide abelian subalgebras of string fields, closed under both the *-product and the action of Ł_0. This structure guarantees exact solvability of a ghost number zero string field equation. We recast this infinite recursive set of equations as an ordinary differential equation that is easily solved. The classification of special projectors is reduced to a version of the Riemann-Hilbert problem, with piecewise constant data on the boundary of a disk.
description: 64 pages, 6 figures
Exoplanet HD 209458b : Evaporation strengthened
Creators: name: Vidal-Madjar, A.
name: Etangs, A. Lecavelier des
name: Desert, J. -M.
name: Ballester, G. E.
name: Ferlet, R.
name: Hebrard, G.
name: Mayor, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Following re-analysis of Hubble Space Telescope observations of primary transits of the extrasolar planet HD209458b at Lyman-alpha, Ben-Jaffel (2007, BJ007) claims that no sign of evaporation is observed. Here we show that, in fact, this new analysis is consistent with the one of Vidal-Madjar et al. (2003, VM003) and supports the detection of evaporation. The apparent disagreement is mainly due to the disparate wavelength ranges that are used to derive the transit absorption depth. VM003 derives a (15+/-4)% absorption depth during transit over the core of the stellar Lyman-alpha line (from -130 km/s to +100 km/s), and this result agrees with the (8.9+/-2.1)% absorption depth reported by BJ007 from a slightly expanded dataset but over a larger wavelength range (+/-200 km/s). These measurements agree also with the (5+/-2)% absorption reported by Vidal-Madjar et al. (2004) over the whole Lyman-alpha line from independent, lower-resolution data. We show that stellar Lyman-alpha variability is unlikely to significantly affect those detections. The HI atoms must necessarily have velocities above the escape velocities and/or be outside the Roche lobe, given the lobe shape and orientation. Absorption by HI in HD209458b's atmosphere has thus been detected with different datasets, and now with independent analyses. All these results strengthen the concept of evaporating hot-Jupiters, as well as the modelization of this phenomenon.
description: To be published in ApJL
Συγκριτική μελέτη γεωμετρικού περιεχομένου και τοπωνυμίων στη Generalkarte: εφαρμογή στα φύλλα χάρτη που καλύπτουν το Ν. Ιωαννίνων
Creators: name: Βάσσος, Κωνσταντίνος Αλεξάνδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Generalkarte
ΓΥΣ
Γεωμετρικό περιεχόμενο
Σύγκριση χαρτών
Σύγκριση τοπωνυμίων
Hellenic Military Geographical Service
Geometric content
Map comparison
Toponym comparison

description: Η σειρά χαρτών της Generalkarte αποτελεί μεγάλη κληρονομιά για την ελληνική χαρτογραφία αλλά και την εξέλιξη της χαρτογραφικής επιστήμης γενικότερα. Στην παρούσα εργασία, αναλύεται η γεωμετρική υποδομή και το γεωμετρικό περιεχόμενο των χαρτών της Generalkarte και των αντίστοιχων ελληνικών τους παράγωγων χαρτών που καλύπτουν το νομό Ιωαννίνων. Ακολούθως οι χάρτες αυτοί συγκρίνονται τόσο μεταξύ τους, όσο και με τους σύγχρονους χάρτες της ΓΥΣ για να διαπιστωθούν ομοιότητες και διαφορές στην αποτύπωση της περιοχής. Οι συγκρίσεις αφορούν το γεωμετρικό περιεχόμενο καθώς και τις αλλαγές των τοπωνυμίων τόσο ως προς τη θέση τους, όσο και ως προς την ονομασία τους. Από την μελέτη των ιστορικών αυτών χαρτών προκύπτουν ενδιαφέροντα συμπεράσματα όσον αφορά στη ακρίβεια της χαρτογράφησης της συγκεκριμένης περιοχής αλλά και την εξέλιξη της χαρτογραφικής παραγωγής ως προς τις μεθόδους και τις τεχνικές αποτύπωσης.
description: The map sheets of Generalkarte are a great heritage not only for the Greek cartography, but also for the evolution of cartography in general. In this study, the geometric structure and content of the Generalkarte map sheets and their relative Greek products that cover the prefecture of Ioannina are analyzed thoroughly. These maps are compared to each other and to those of the Hellenic Military Geographical Service, in order to identify similarities and differences concerning the representation of the study area. The comparisons are referred to the geometric content of the maps and changes to the positions and names of the toponyms. By studying these historical maps, many interesting conclusions arise regarding the precision of the cartography of the specific area and the evolution of the cartographic production as far as the methods and representation techniques are concerned.
Finite temperature instabilities of 2D dipolar Bose gas at arbitrary tilt angle
Creators: name: Shen, Pengtao
name: Quader, Khandker F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Advances in creating stable dipolar Bose systems, and ingenious box traps have generated tremendous interest. Theory study of dipolar bosons at finite temperature (T) has been limited. Motivated by these, we study 2D dipolar bosons at arbitrary tilt angle, $θ$, using finite-T random phase approximation. We show that a comprehensive understanding of phases and instabilities at non-zero T can be obtained on concurrently considering dipole strength, density, temperature and $θ$. We find the system to be in a homogeneous non-condensed phase that undergoes a collapse transition at large $θ$, and a finite momentum instability, signaling a striped phase, at large dipolar strength; there are important differences with the T=0 case. At T = 0, BEC appears at critical dipolar strength, and at critical density. Our predictions for polar molecule system, $^{41}K^{87}Rb$, and $^{166}Er$ may provide tests of our results. Our approach may apply broadly to systems with long-range, anisotropic interactions.
ERICC Policy Brief _ Education Data Systems in Conflict and Protracted Crisis
Creators: name: ERICC Consortium
name: Salmon-Letelier, Marlana
name: Homonchuk, Olha
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390201
subject: Education policy

description: Data and evidence are a prerequisite for evidence-informed decision-making. However, governments and donors often face challenges in gathering the most reliable data and evidence to inform policies and allocate budget to implement educational programmes. These challenges often arise from a lack of granularity, timeliness and credibility in the data system. Moreover, many education data platforms are not user-friendly, which deters stakeholder engagement, particularly at regional and school levels. In contexts of conflict and protracted crisis, data is fragmented across different education authorities, and the humanitarian and development projects.Better data systems are vital for improving access, quality and continuity of education for children, as well as holding education stakeholders accountable for effective disbursement of often limited education funding. This evidence brief provides a summary of challenges and ways to improve Education in Emergencies (EiE) data systems. It draws on findings from a comprehensive evidence review (Salmon-Letelier, forthcoming) based on a review of more than 400 peer-reviewed articles and grey literature as well as seven country-level case studies of data systems in Syria, Jordan, Lebanon, South Sudan, Nigeria, Bangladesh and Myanmar.Education systems in conflict-affected and crisis settings face a range of challenges in establishing effective data systems. Our analysis reveals two main areas of difficulties relating to the data process: "data identification and collection" and "data-sharing and utilisation”.What could work better to strengthen data systems?Including local stakeholders and strengthening their capacitiesHarmonising indicators across different data sourcesIncentivising collaboration and data-sharingEnhancing quality and relevance of dataEnsuring key stakeholders have timely access to data
Σαν παραμύθι...» 12+1 ιστορίες γύρω από τη Δημοτική μας Εκπαίδευση: Εκθέσεις των επιθεωρητών του 1883 και εκπαιδευτικές μεταρρυθμίσεις στο τελευταίο τέταρτο του 19ου αιώνα:
Creators: name: Πασχαλίδης, Πέτρος Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Εκθέσεις
Δημοτική Εκπαίδευση
Επιθεωρητής
Reports
Primary Education
School counselor

description: Η παρούσα εργασία είχε σκοπό να μελετήσει συστηματικά και να παρουσιάσει την κατάσταση της Δημοτικής Εκπαίδευσης στα 1883 μέσα από τη συστηματική καταγραφή, ανάλυση και ερμηνεία των εκθέσεων των επιθεωρητών και να διερευνήσει τη σχέση τους με την εκπαιδευτική πολιτική της Ελλάδας στα χρόνια που ακολούθησαν, έως το 1899. Αποτελείται από πέντε κεφάλαια. Στο πρώτο παρουσιάζεται το ιστορικό, πολιτικό και κοινωνικό συγκείμενο της παρούσας εργασίας. Δίνεται έμφαση σε πρόσωπα και γεγονότα που διαμόρφωσαν το πλαίσιο πριν και μετά τη δημοσίευση των εκθέσεων το 1883. Στο δεύτερο γίνεται μια αναδρομή στη Δημοτική Εκπαίδευση, προκειμένου να αντιληφθούμε με ποια δεδομένα βρέθηκαν αντιμέτωποι οι έκτακτοι επιθεωρητές του 1883. Το τρίτο είναι αφιερωμένο στο θεσμό του επιθεωρητή έτσι όπως αυτός διαμορφώθηκε και εξελήχθηκε κατά τη διάρκεια του 19ου αιώνα. Το τέταρτο περιλαμβάνει την έρευνα η οποία συντελείται με το μεθοδολογικό παράδειγμα της ποιοτικής ανάλυσης περιεχομένου. Στο πέμπτο το ενδιαφέρον μας εστιάζεται όχι πλέον στα πορίσματα των επιθεωρητών αλλά στα μέτρα που προτείνουν για να επιλυθούν ορισμένα προβλήματα της Δημοτικής Εκπαίδευσης. Οι εκθέσεις των επιθεωρητών του 1883 αποτελούν σπουδαία κείμενα καθώς αποτυπώνουν την όλη κατάσταση μιας συγκεκριμένης εποχής με αναφορές σε όλους τους εκπαιδευτικούς φορείς.
description: The aim of the present thesis was to study intensively and to present the situation of Primary Education in 1883 through the systematic study, analysis and interpretation from the reports of school counselors and look into their connection with Greek education policy in the following year, up to 1899. This essay consists of five chapters. The first chapter presents the historical, political and social status. Emphasizes people and facts that formed the context before and after the publication of the reports. In the second one, there is a retrospection in Primary Education, in order to consider which facts the temporal school counselors faced. The third one is dedicated to the institution of school counselor as it developed during the 19oth. The fourth chapter includes the research which took place by the paradigm of qualitative method. In the fifth one our interest focuses on not any more on the couselor’s conclusions but on the proposals they suggest so that a lot of problems could be solved. The reports of school counselors are a valuable treasure for the History of Education because the conclusions that were found out are very important as they indicate the whole situation of a specific era with references to all the educational parts.
On the Correlation of Geographic and Network Proximity at Internet Edges and its Implications for Mobile Unicast and Multicast Routing
Creators: name: Schmidt, Thomas C.
name: Wählisch, Matthias
name: Zhang, Ying
Publisher: name: arXiv
Year: 2007
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Hardware Architecture (cs.AR)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences
subject: C.2.3; C.2.5; C.2.6; C.4

description: Significant effort has been invested recently to accelerate handover operations in a next generation mobile Internet. Corresponding works for developing efficient mobile multicast management are emergent. Both problems simultaneously expose routing complexity between subsequent points of attachment as a characteristic parameter for handover performance in access networks. As continuous mobility handovers necessarily occur between access routers located in geographic vicinity, this paper investigates on the hypothesis that geographically adjacent edge networks attain a reduced network distances as compared to arbitrary Internet nodes. We therefore evaluate and analyze edge distance distributions in various regions for clustered IP ranges on their geographic location such as a city. We use traceroute to collect packet forwarding path and round-trip-time of each intermediate node to scan-wise derive an upper bound of the node distances. Results of different scanning origins are compared to obtain the best estimation of network distance of each pair. Our results are compared with corresponding analysis of CAIDA Skitter data, overall leading to fairly stable, reproducible edge distance distributions. As a first conclusion on expected impact on handover performance measures, our results indicate a general optimum for handover anticipation time in 802.11 networks of 25 ms.
description: 6 pages including 6 figures
Ανάλυση και πρόβλεψη εναλλακτικών εξωνίων με τεχνικές επεξεργασίας σήματος
Creators: name: Τσιάμης, Γεώργιος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: subject: Εναλλακτικά
subject: Εξώνια
subject: Ταξινόμηση
subject: Bioinformatics
subject: FOS: Computer and information sciences
subject: Exons
subject: Classification

description: Αντικείμενο της διπλωματικής εργασίας είναι η μελέτη του εναλλακτικού ματίσματος με έμφαση στην ανάλυση και κατηγοριοποίηση των cassette και constitutive εξωνίων. Cassette ονομάζονται τα εξώνια που συμμετέχουν κάποιες φορές στην διαδικασία της μετάφρασης και κάποιες φορές δεν συμμετέχουν. Αποτελούν τη πιο συχνή μορφή εναλλακτικού ματίσματος στον άνθρωπο. Τα constitutive exons είναι τα εξώνια που είναι κοινά σε όλες τις ισόμορφες που προκύπτουν από ένα γονίδιο. Πιο συγκεκριμένα, υπολογίστηκαν φασματικά χαρακτηριστικά μεταξύ ιντρονίων και εξωνίων και επιβεβαιώθηκε η δυνατότητα διαφοροποίησης μεταξύ τους. Στη συνέχεια υπολογίστηκα φασματικά χαρακτηριστικά, ανάλογα με αυτά του βήματος 1 μεταξύ cassette και constitutive εξωνίων. Επιπλέον, υπολογίστηκαν στατιστικά χαρακτηριστικά (ποσοστά βάσεων, δινουκλεοτιδίων και κωδικωνίων) και χαρακτηριστικά πολυπλοκότητας (εντροπία και εντροπία σε πολλαπλές κλίμακες). Για κάθε χαρακτηριστικό, εφαρμόστηκαν στατιστικά τεστ και εξετάστηκε η αξία του στο διαχωρισμό των δύο ομάδων. Τα στατιστικώς σημαντικά χαρακτηριστικά για την κατάταξη των εξωνίων ήταν περίπου 176. Από το σύνολο των στατιστικά σημαντικών χαρακτηριστικών, έγινε η επιλογή των καλύτερων, με βάση κριτήρια καλύτερου διαχωρισμού των δυο ομάδων. Έτσι, μειώθηκε ο αριθμός των επιλεγμένων χαρακτηριστικών σε 44. Χρησιμοποιώντας τα χαρακτηριστικά του βήματος 4, εφαρμόστηκαν και εκπαιδεύτηκαν αλγόριθμοι SVM (Support Vector Machine) για την ταξινόμηση των εξωνίων σε cassette και σε constitutive.
description: The aim of the present thesis was the study of alternative splicing with emphasis on analysis and classification of cassette and constitutive exons. Cassette exons are exons that either involve in the process of translation or not. They are the most common form of alternative splicing in humans. The constitutive exons are exons that are common to all isoforms derived from a gene. More specifically, we calculated spectral characteristics between introns and exons and confirmed the possibility to differentiate between them. Then, we calculated spectral characteristics similar to those of step 1 between cassette and constitutive exons. Furthermore, statistical characteristics were calculated (rates of bases,dinucleotide and triplets) and characteristics of complexity (entropy and entropy at multiple scales). For each feature, statistical tests were applied and tested its value in separating the two groups. The statistically significant features for classification of exons were about 176. Furthermore, we decreased the number of selected features in 44 in order to achieve better classification. Using the characteristics that calculated, SVM algorithms were implemented and trained (Support Vector Machine) for the classification of a cassette exons and constitutive.
Increase of amplitude of accelerating wakefield excited by sequence of short relativistic electron bunches in plasma at magnetic field use
Creators: name: Bondar, D. S.
name: Levchuk, I. P.
name: Maslov, V. I.
name: Onishchenko, I. N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences
subject: F.2.1
subject: 65Z05

description: Earlier, the authors found a mechanism for the sequence of short relativistic electron bunches, which leads to resonant excitation of the wakefield, even if the repetition frequency of bunches differs from the plasma frequency. In this case, the synchronization of frequencies is restored due to defocusing of the bunches which get into the bad phases with respect to the plasma wave. However, in this case, the bunches are lost, which as a result of this do not participate in the excitation of the wakefield. In this paper, numerical simulation was used to study the dynamics of electron bunches and the excitation of the wakefield in a magnetized plasma by a long sequence of short bunches of relativistic electrons. When a magnetic field is used, the defocussed bunches return to the region of interaction with the field after a certain time. In this case, the electrons of the bunches, returning to the necessary phases of the field, participate in the excitation of the wakefield. Also, the use of a magnetic field leads to an increase of the frequency of the excited wave relative to the repetition frequency of bunches. The latter increases the time for maintaining the resonance and, consequently, leads to an increase of the amplitude of the excited wakefield.
description: 8 pages, 15 figures
Moments of the Hadronic Invariant Mass Spectrum in B --> X_c l nu Decays at Belle
Creators: name: Schwanda, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the hadronic invariant mass squared (M^2_X) spectrum in charmed semileptonic B meson decays B --> X_c l nu based on 140 fb^-1 of Belle data collected near the Y(4S) resonance. We determine the first, the second central and the second non-central moments of this spectrum for lepton energy thresholds ranging between 0.7 and 1.9 GeV. Full correlations between these measurements are evaluated.
description: published version of the paper (one figure added, minor changes in the text); 16 pages, 3 figures, 10 tables
3D-vortex labyrinths in the near field of solid-state microchip laser
Creators: name: Okulov, A. Yu.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The spatiotemporal vortex lattices generated in high Fresnel number solid-state microchip lasers are studied in connection with Talbot phenomenon generic to spatially periodic electromagnetic fields. The spatial layout of light field is obtained via dynamical model based on Maxwell-Bloch equations for class-B laser, discrete Fox-Lee map with relaxation of inversion and static model based on superposition of copropagating Gaussian beams. The spatial patterns observed experimentally and obtained numerically are interpreted as nonlinear superposition of vortices with helicoidal phase dislocations. The usage of vortex labyrinths and Talbot lattices as optical dipole traps for neutral atoms is considered for the wavelength of trapping radiation in the range 0.98 $÷$ 2.79 $μm$. The separable optical trapping potential is mounted as a sum of array of vortex lines and additional parabolic subtrap. The factorization of macroscopic wavefunction have led to analytical solution of Gross-Pitaevski equation for ground state of ensemble of quantum particles trapped in vortex labyrinth and in spatially - periodic array of Gaussian beams.
description: 10 pages 7 figures
Investigating the quench dynamics of the bound states in a spin-orbital coupling system using a trapped ion
Creators: name: Zhang, Hao-Qing
name: Ai, Ming-Zhong
name: Cui, Jin-Ming
name: Han, Yong-Jian
name: Li, Chuan-Feng
name: Guo, Guang-Can
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum walk (QW), as the quantum analog of classical random walk, provides a feasible platform to study the topological phenomenon and non-equilibrium dynamics. Here, we propose a novel scheme to realize the quantum walk with a single trapped ion where the Fock states provides the walk space and zero phonon state $\left|n=0\right\rangle $ serves as its natural boundary. Thus, our scheme offers the unique opportunity to investigate the dynamics of the bound states of the corresponding topological systems. Particularly, the quench dynamics of the bound states can be extensively studied by tuning the bulk parameters and the local boundary operator, which are experimentally accessible. Our proposal not only offers a new approach to exploring the character of the bound states of the topological systems, but also offers a way to determine different phases through the dynamical processes.
description: 15 pages, 13 figures
Axisymmetric simulations of magnetorotational core collapse: Approximate inclusion of general relativistic effects
Creators: name: Obergaulinger, M.
name: Aloy, M. A.
name: Dimmelmeier, H.
name: Mueller, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We continue our investigations of the magnetorotational collapse of stellar cores discussing simulations performed with a modified Newtonian gravitational potential that mimics general relativistic effects. The approximate TOV potential used in our simulations catches several features of fully relativistic simulations quite well. It is able to correctly reproduce the behavior of models which show a qualitative change both of the dynamics and the gravitational wave signal when switching from Newtonian to fully relativistic simulations. If this is not the case, the Newtonian and the approximate TOV models differ quantitatively. The collapse proceeds to higher densities with the approximate TOV potential allowing for a more efficient amplification of the magnetic field by differential rotation. Sufficiently strong magnetic fields brake down the core's rotation and trigger a contraction phase to higher densities. Several models exhibit two different kinds of shock generation. Due to magnetic braking, a first shock wave created during the initial centrifugal bounce does not suffice to eject any mass, and the core continues to collapse to supranuclear densities. Another stronger shock wave is generated during the second bounce as the core exceeds nuclear matter density. The gravitational wave signal of these models does not fit into the standard classification. Instead it belongs to the signal type IV introduced by us in the first paper of this series. This signal type is more frequent for the approximate relativistic potential than for the Newtonian one. Strongly magnetized models emit a substantial fraction of their GW power at very low frequencies. A flat spectrum between 10 Hz and > 100 kHz denotes the generation of a jet-like outflow. [Abstract abbreviated]
description: 17 pages, 9 figures, published in A&A, new version includes discussion of jet phyics and angular-momentum transport, furthermore minor changes w.r.t. version 1; Fig. 4 in reduced resolution
title: Encomia. 2010-2011, n° 34-35
title: Bulletin bibliographique de la Société internationale de littérature courtoise
titleType: Subtitle
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2015
Subjects: subject: Littérature médiévale
subject: Littérature française du Moyen Âge
subject: Littérature courtoise
subject: Littérature allemande du Moyen Âge
subject: Littérature anglaise du Moyen Âge
subject: Littérature espagnole du Moyen Âge
subject: Littérature italienne du Moyen Âge
subject: Histoire culturelle du Moyen Âge
subject: Bibliographie médiévale

description: Le volume 34-35 d'Encomia comporte la bibliographie de la totalité de la production critique touchant la littérature courtoise européenne du Moyen Âge pour la période 2010-2011. En l'occurrence, on trouvera 2 800 entrées, éditions, monographies, articles, comptes-rendus. La grande majorité est accompagnée d'un résumé.
description: Volume 34-35 of the Encomia is a bibliography of all critical work on medieval European courtly literature produced in the period 2010-2011. This includes 2,800 entries, editions, monographs, articles, and summaries. The great majority are accompanied by an abstract.
Οι διαφορές των δύο φύλων ως προς το περιβάλλον κατανάλωσης των επιχειρήσεων:
Creators: name: Ζιώγα, Αμαλία Λάμπρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Διαφορές δύο φύλων
Περιβάλλον Επιχειρήσεων
Εμπορικά Κέντρα
Gender differences
Consumer Environment
Shopping Mall

description: Η παρούσα μελέτη έχει ως στόχο να διερευνήσει εάν επηρεάζονται διαφορετικά τα δύο φύλα, ως προς τη στάση και τη συμπεριφορά τους, από τα ερεθίσματα στα οποία εκτίθενται και τα οποία διαμορφώνουν το περιβάλλον κατανάλωσης των εμπορικών κέντρων. Για τη διεξαγωγή της έρευνας συντάχθηκε ερωτηματολόγιο που μοιράστηκε σε ένα δείγμα 221 ατόμων. Στα δεδομένα που συλλέχθηκαν πραγματοποιήθηκε στατιστική ανάλυση με τη βοήθεια του στατιστικού πακέτου IBM SPSS Statistics 19, ώστε να βρεθούν οι σχέσεις μεταξύ του κάθε στοιχείου του περιβάλλοντος κατανάλωσης του εμπορικού κέντρου και της στάσης και της συμπεριφοράς των καταναλωτών ως προς αυτό αντίστοιχα. Με βάση τα αποτελέσματα των σχέσεων αυτών στη συνέχεια έγιναν οι στατιστικοί έλεγχοι ως προς τους άντρες και τις γυναίκες. Τα αποτελέσματα της έρευνας έδειξαν ότι οι γυναίκες επηρεάζονται θετικά περισσότερο από τους άντρες ως προς τη στάση και τη συμπεριφορά τους στο εμπορικό κέντρο, εξαιτίας της θετικής αντίληψης της μουσικής που παίζεται στους χώρους του. Οι υπόλοιποι περιβαλλοντικοί, κοινωνικοί και σχεδιαστικοί παράγοντες δεν παρουσιάζουν στατιστικά σημαντικές διαφορές ανάμεσα στα δύο φύλα. Επιπλέον διαπιστώθηκε ότι η θετική στάση επηρεάζει θετικά την πίστη και αφοσίωση ως προς το εμπορικό κέντρο, μία σχέση η οποία δε διαφέρει ανάμεσα σε άντρες και γυναίκες.
description: This study aims to investigate if there are any gender differences, regarding their attitude and behavior, to the stimuli they are exposed and which form the mall environment. For the conduct of research, was drawn up a questionnaire which was distributed to a sample of 221 individuals. The data collected was statistically analyzed in order to find if there are any relationships between each component of the consumption environment of the shopping center and the attitude and behavior of consumers in this respectively. The results showed that women are more positively affected than men to their attitude and behavior to the mall because of the positive perception of the music played in the premises. To the rest of the environmental, social and design factors not statistically significant differences were found between the two genders. Moreover it was found that the positive attitude positively affects loyalty and commitment to the mall, a relationship that does not differ between men and women.
Η αφοσίωση του φιλάθλου ως παράγοντας διαμόρφωσης της προσωπικότητας της αθλητικής μάρκας και των χορηγιών
Creators: name: Ρογκότης, Σάββας Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Αφοσίωση Φιλάθλου
Προσωπικότητα Αθλητικής Μάρκας
Αθλητικές Χορηγίες
Fan Identification
Sports Brand Personality
Sports Sponsorships

description: Σκοπός της πτυχιακής εργασίας είναι η μελέτη κάποιων εννοιών που απασχολούν το σύγχρονο αθλητικό μαρκετινγκ και η προσπάθεια αναγνώρισης των σχέσεων που τις συνδέει. Οι έννοιες που αναλύονται είναι η αφοσίωση του φιλάθλου, η προσωπικότητα της αθλητικής μάρκας, η αναγνώρισιμότητα του χορηγού, η στάση απέναντι στον χορηγό, η υποστήριξη του χορηγού και η ενασχόληση με το άθλημα του ποδοσφαίρου. Με την χρήση των απαραίτητων κλιμάκων μέτρησης, προκύπτουν στατιστικά στοιχεία που επιβεβαιώνουν και ενισχύουν την υπάρχουσα αρθρογραφία.
description: The aim of the present thesis was the study of certain concepts regarding modern sports marketing and the discovery of the correlations between them. The examined concepts were fan identification, sports brand personality, sponsor recognition, attitude towards sponsor, sponsor patronage and domain involvement. By the use of the necessary scales, we came along important statistical data that confirm and support the existing literature in the field.
Conformal Scattering and the Goursat Problem for Dirac Fields in the Interior of Charged Spherically Symmetric Black Holes
Creators: name: Mokdad, Mokdad
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35Q41, 35Q75, 83C57

description: We construct a conformal scattering theory for Dirac fields in the interior of a Reissner-Nordström-like black hole, between the black hole event horizon and the Cauchy horizon. The main result is a resolution of the characteristic Cauchy problem for the Dirac equation on the horizons by solving a system of wave equations and re-interpreting its solution as the components of the required Dirac solution.
description: 13 pages, 2 figures
Pancakes as opposed to Swiss Cheese
Creators: name: Nájera, Sebastián
name: Sussman, Roberto A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We examine a novel class of toy models of cosmological inhomogeneities by smoothly matching along a suitable hypersurface an arbitrary number of sections of "quasi flat" inhomogeous and anisotropic Szekeres-II models to sections of any spatially flat cosmology that can be described by the Robertson-Waker metric (including de Sitter, anti de Sitter and Minkowski spacetimes). The resulting "pancake" models are quasi-flat analogues to the well known spherical "Swiss-cheese" models found in the literature. Since Szekeres-II models can be, in general, compatible with a wide range of sources (dissipative fluids, mixtures of non-comoving fluids, mixtures of fluids with scalar or magnetic fields or gravitational waves), the pancake configurations we present allow for a description of a wide collection of localized sources embedded in a Robertson-Waker geometry. We provide various simple examples of arbitrary numbers of Szekeres-II regions (whose sources are comoving dust and energy flux interpreted as a field of peculiar velocities) matched with Einstein de Sitter, $Λ$CDM and de Sitter backgrounds. We also prove that the Szekeres-II regions can be rigorously regarded as "exact" perturbations on a background defined by the matching discussed above. We believe that these models can be useful to test ideas on averaging and backreaction and on the effect of inhomogeneities on cosmic evolution and observations.
description: 19 pages, 4 figures
Non-gaussianity of inflationary field perturbations from the field equation
Creators: name: Seery, David
name: Malik, Karim A.
name: Lyth, David H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate the tree-level bispectrum of the inflaton field perturbation directly from the field equations, and construct the corresponding f_NL parameter. Our results agree with previous ones derived from the Lagrangian. We argue that quantum theory should only be used to calculate the correlators when they first become classical a few Hubble times after horizon exit, the classical evolution taking over thereafter.
description: 16 pages, uses iopart.sty. v2: replaced with version accepted by JCAP; minor changes of wording only. v3: supersedes version published by journal; typo fixed in Eq. (20) and updated references. v4: sign errors in Eqs. (32) and (38) corrected
Implementation of Johansen’s art criticism model within a grade two classroom
Creators: name: Wong, Man Chee Patty
Publisher: name: University of British Columbia
Year: 2009

description: This thesis reports an action research project which was undertaken to study, understand, and improve a teacher/researcher's pedagogy of art criticism in a grade two class, through implementation of Johansen's art criticism model. Concurrently, Johansen's art criticism model was tested for its suitability in the context of primary teaching. Data for this study was collected within an operationa grade two class through eight art criticism lessons, three semi-structured interviews, students' journal writings, and entries in the teacher's field diary. Results from this study indicate that Johansen's art criticism model is suitable for guiding second graders through the art criticism process provided it is appropriately implemented. The study also found that, on the whole, the subjects are at the second stage of aestheti development as proposed by Parsons (1982). The study concludes with recommendations as to how Johansen's art criticism model can be effectively implemented within a primary class and what generalist teachers need in order to incorporate art criticism into their art program to bridge the gap between theory and practice.
Number counts and clustering properties of bright Distant Red Galaxies in the UKIDSS Ultra Deep Survey Early Data Release
Creators: name: Foucaud, S.
name: Almaini, O.
name: Smail, I.
name: Conselice, C. J.
name: Lane, K. P.
name: Edge, A. C.
name: Simpson, C.
name: Dunlop, J. S.
name: McLure, R. J.
name: Cirasuolo, M.
name: Hirst, P.
name: Watson, M. G.
name: Page, M. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We describe the number counts and spatial distribution of 239 Distant Red Galaxies (DRGs), selected from the Early Data Release of the UKIDSS Ultra Deep Survey. The DRGs are identified by their very red infrared colours with (J-K)AB>1.3, selected over 0.62 sq degree to a 90% completeness limit of KAB~20.7. This is the first time a large sample of bright DRGs has been studied within a contiguous area, and we provide the first measurements of their number counts and clustering. The population shows strong angular clustering, intermediate between those of K-selected field galaxies and optical/infrared-selected Extremely Red Galaxies. Adopting the redshift distributions determined from other recent studies, we infer a high correlation length of r0~11 h-1 Mpc. Such strong clustering could imply that our galaxies are hosted by very massive dark matter halos, consistent with the progenitors of present-day L>L* elliptical galaxies.
description: 5 pages, 4 figures, revised version accepted to MNRAS. Higher-resolution figures available from the authors on request
Generalization of the Secant Method for Nonlinear Equations (extended version)
Creators: name: Sidi, Avram
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The secant method is a very effective numerical procedure used for solving nonlinear equations of the form $f(x)=0$. It is derived via a linear interpolation procedure and employs only values of $f(x)$ at the approximations to the root of $f(x)=0$, hence it computes $f(x)$ only once per iteration. In this note, we generalize it by replacing the relevant linear interpolant by a suitable $(k+1)$-point polynomial of interpolation, where $k$ is an integer at least 2. Just as the secant method, this generalization too enjoys the property that it computes $f(x)$ only once per iteration. We provide its error in closed form and analyze its order of convergence $s_k$. We show that this order of convergence is greater than that of the secant method, and it increases towards $2$ as $k\to \infty$. (Indeed, $s_7=1.9960\cdots$, for example.) This is true for the efficiency index of the method too. We also confirm the theory via an illustrative example.
Homology and symmetry breaking in Rayleigh-Benard convection: Experiments and simulations
Creators: name: Krishan, Kapilanjan
name: Kurtuldu, Huseyin
name: Schatz, Michael F.
name: Gameiro, Marcio
name: Mischaikow, Konstantin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Algebraic topology (homology) is used to analyze the weakly turbulent state of spiral defect chaos in both laboratory experiments and numerical simulations of Rayleigh-Benard convection.The analysis reveals topological asymmetries that arise when non-Boussinesq effects are present.
description: 21 pages with 6 figures
MPEC 2024-T179 : 2024 TZ4
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TZ4

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Nonadiabatic transitions in Landau-Zener grids: integrability and semiclassical theory
Creators: name: Malla, Rajesh K.
name: Chernyak, Vladimir Y.
name: Sinitsyn, Nikolai A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate that the general model of a linearly time-dependent crossing of two energy bands is integrable. Namely, the Hamiltonian of this model has a quadratically time-dependent commuting operator. We apply this property to four-state Landau-Zener (LZ) models that have previously been used to describe the Landau-Stückelberg interferometry experiments with an electron shuttling between two semiconductor quantum dots. The integrability then leads to simple but nontrivial exact relations for the transition probabilities. In addition, the integrability leads to a semiclassical theory that provides analytical approximation for the transition probabilities in these models for all parameter values. The results predict a dynamic phase transition, and show that similarly-looking models belong to different topological classes.
An explanation for high defect tolerance in metal halide perovskite quantum dots
Creators: name: Cui, Yu
name: Liu, Xiao-Yi
name: Deng, Jia-Pei
name: Li, Zhi-Qing
name: Wang, Zi-Wu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose Auger-like process assisted by quantum defects in metal halide perovskite quantum dots, where a charge carrier in the ground state of the quantum dot is trapped by quantum defects, resulting in another charge carrier in defect is excited and returns back to the ground state of the quantum dot. We find that the whole process is on the femtosecond scale. More importantly, the process is independent of the depth and species of the defects, which is in good agreement with the recent theoretical prediction using ab initio nonadiabatic molecular dynamics simulation. This Auger-like process may provide a potential explanation of high defect tolerance in metal halide perovskite materials.
Neutrino tomography - Learning about the Earth's interior using the propagation of neutrinos
Creators: name: Winter, Walter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geophysics (physics.geo-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Because the propagation of neutrinos is affected by the presence of Earth matter, it opens new possibilities to probe the Earth's interior. Different approaches range from techniques based upon the interaction of high energy (above TeV) neutrinos with Earth matter, to methods using the MSW effect on the neutrino oscillations of low energy (MeV to GeV) neutrinos. In principle, neutrinos from many different sources (sun, atmosphere, supernovae, beams etc.) can be used. In this talk, we summarize and compare different approaches with an emphasis on more recent developments. In addition, we point out other geophysical aspects relevant for neutrino oscillations.
description: 22 pages, 9 figures. Proceedings of ``Neutrino sciences 2005: Neutrino geophysics'', December 14-16, 2005, Honolulu, USA. Minor changes, some references added. Final version to appear in Earth, Moon, and Planets