cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Μελέτη της εφαρμογής διερευνητικής προσέγγισης στη διδασκαλία των Φυσικών Επιστημών στην πρωτοβάθμια εκπαίδευση και των επιπτώσεών της στην κατανόηση όψεων της φύσης της επιστήμης από μαθητές και μαθή
Creators: name: Κουτρούπη, Αναστασία Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Διερευνητική διδασκαλία
Φύση της επιστήμης
Αντιλήψεις μαθητών
Inquiry-based teaching
Nature of science
Students’ conceptions

description: Η παρούσα ερευνητική προσπάθεια εστιάζει στη σύγχρονη διερευνητική προσέγγιση της διδασκαλίας των φυσικών επιστημών και στη ρητή διδασκαλία όψεων της φύσης της επιστήμης στην πρωτοβάθμια εκπαίδευση. Πιο συγκεκριμένα, μελετώνται οι αντιλήψεις των μαθητών για δύο από τις σημαντικότερες όψεις της φύσης της επιστήμης, της παρατήρησης και της ερμηνείας της παρατήρησης, πριν και μετά την εφαρμογή ειδικά σχεδιασμένης διδακτικής παρέμβασης. Η διδακτική παρέμβαση ακολουθεί τις φάσεις του διερευνητικού μοντέλου ΔΙΕΔΙΑ και περιλαμβάνει ρητή διδασκαλία των δύο όψεων, σε συνδυασμό με διδασκαλία για το φαινόμενο της σκιάς. Με τη χρήση ερωτηματολογίου ανοιχτού τύπου και ημι-δομημένης συνέντευξης μελετήθηκε η ικανότητα μαθητών και μαθητριών να διακρίνουν τις δύο όψεις που προαναφέρθηκαν, τόσο πριν όσο και μετά την παρέμβαση
description: The present research focuses on the inquiry-based science teaching and on the explicit approach in teaching aspects of the nature of science in primary education. Specifically, we study primary students’ conceptions on two of the most important aspects of the nature of science, observation and inference, before and after we implemented a specially designed intervention. The intervention is developed according the INRU inquiry-based teaching model and includes an explicit nature of science lesson in conjunction with teaching about the concept of light and shadows. Using an open-ended questionnaire and semi-structured we tried to measure the students’ ability to distinguish between the two aforementioned aspects of the nature of science, before and after the implementation of the explicit inquiry-based intervention
Ανάλυση, σχεδίαση και υλοποίηση honeypots στην ασφάλεια δικτύων
Creators: name: Χατζημιχαήλ, Γεώργιος Ζήση
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Ασφάλεια δικτύων
Δικτυακά συστήματα ασφαλείας
Κενά ασφαλείας δικτυακών πρωτοκόλλων
Network security
Honeypots
Dionaea

description: Η ασφάλεια πληροφοριακών συστημάτων ήταν παραδοσιακά συνυφασμένη με μία κατά βάση αμυντική λογική. Ωστόσο σήμερα, γίνεται φανερή από τη μία η ανάγκη για πιο δυνατά συστήματα προστασίας και από την άλλη η δυσκολία σαφούς καθορισμού του ποιος είναι ο επιτιθέμενος και τι σκοπούς έχει. Στόχος της παρούσας διπλωματικής εργασίας είναι η μελέτη των honeypots χαμηλής και μεσαίας αλληλοεπίδρασης τόσο σε θεωρητικό όσο και σε πρακτικό επίπεδο. Η δομή της εργασίας έχει ως εξής: Στο πρώτο κεφάλαιο δίνονται οι βασικοί ορισμοί, οι κατηγοριοποιήσεις, διάφορες χρήσιμες πληροφορίες και προβληματισμοί γύρο από την τεχνολογία των Honeypots. Ακολούθως, στο δεύτερο κεφάλαιο είναι η ανάλυση, τόσο από τρόπο λειτουργίας όσο και αρχιτεκτονικής, ενός συγκεκριμένου honeypot, του Dionaea, το οποίο χρησιμοποιήθηκε και στο πρακτικό κομμάτι της εργασίας. Το τρίτο κεφάλαιο περιέχει το πρακτικό κομμάτι αναλύοντας την τοπολογία δικτύου μέσα στην οποία εγκαταστάθηκε το honeypot, τον τρόπο εγκατάστασης του, και μια σειρά επιθέσεων σε διάφορα πρωτόκολλα τα οποία εξετάζεται η συμπεριφορά τόσο από την σκοπιά του επιτιθέμενου όσο και από την πλευρά του Honeypot. Τέλος, στο τέταρτο κεφάλαιο παρουσιάζονται τα συνολικά συμπεράσματα για κάθε μία από τις επιθέσεις που έγιναν και εκτενής αναφορά σε κάθε μία από τις επιθέσεις αυτές, και συνολικά συμπεράσματα για το που υστερεί και που υπερτερεί ένα honeypot
description: The security of information systems has traditionally been associated with a basically defensive logic. But today, it is apparent from one of the need for stronger protection systems and on the other the difficulty of clear definition of who is the aggressor and what the purpose is. The aim of this thesis is the study of honeypots low and medium interaction both theoretical and practical level. The work is structured as follows: The first chapter provides the basic definitions, classifications, useful information and round reflections from the Honeypots technology. Then, in the second chapter is the analysis, both mode and architecture, a specific honeypot, the Dionaea, which was used in the practical part of the work. The third chapter contains practical piece analyzing the network topology in which settled the honeypot, the way of installation, and a series of attacks in various protocols that behavior is examined from both the standpoint of the aggressor and the side of Honeypot. Finally, the fourth section presents the overall conclusions for each of the attacks and made extensive reference to each of these attacks, and overall conclusions about lacking, which predominates a honeypot
N=90 region: The decays of {152m,g}Eu to 152Sm
Creators: name: Kulp, W. D.
name: Wood, J. L.
name: Allmond, J. M.
name: Eimer, J.
name: Furse, D.
name: Krane, K. S.
name: Larimer, R. -M.
name: Loats, J.
name: Norman, E. B.
name: Piechaczek, A.
name: Schmelzenbach, P.
name: Stapels, C. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The decays of {152m,g}Eu to 152Sm have been studied by gamma-ray spectroscopy using the 8pi Spectrometer, an array of 20 Compton-suppressed Ge detectors. Very weak gamma-decay branches in 152Sm were investigated through gamma-gamma coincidence spectroscopy. All possible E2 transitions between states below 1550 keV with transition energies > 130 keV are observed, including the previously unobserved 2^+_3 to 0^+_2 401 keV transition. The results, combined with existing lifetime data, provide a number of new or revised E2 transition strengths which are critical for clarifying the collective structure of 152Sm and the N=90 isotones.
description: 37 pages, 8 figures, 7 tables. Discussion significantly expanded: added comparisons of nine collective models to experimental data (excitation energies, B(E2), isomer shift, rho^2(E0))
Direct Photon Production in Au+Au Collisions at RHIC-PHENIX Experiment
Creators: name: Isobe, Tadaaki
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Direct photons have been measured with the PHENIX experiment in Au+Au collisions at $\sqrt{s_\mathrm{NN}}$ = 200 GeV. The direct photon result obtained with PHENIX-EMCal up to 18 GeV/$c$ is consistent with the NLO pQCD calculation scaled by the nuclear overlap function. The measurement using internal conversion of photons into $e^+e^-$ shows the enhancement of the yield comparing with NLO pQCD calculation.
description: 4 pages, 5 figures. Contributed parallel talk at Hard Probes 2006, Asilomar CA USA, Jun. 9-16, 2006
A Pairwise Connected Tensor Network Representation of Path Integrals
Creators: name: Bose, Amartya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: It has been recently shown how the tensorial nature of real-time path integrals involving the Feynman-Vernon influence functional can be utilized using matrix product states, taking advantage of the finite length of the non-Markovian memory. Tensor networks promise to provide a new, unified language to express the structure of path integral. Here, a generalized tensor network is derived and implemented specifically incorporating the pairwise interaction structure of the influence functional, allowing for a compact representation and efficient evaluation. This pairwise connected tensor network path integral (PCTNPI) is illustrated through applications to typical spin-boson problems and explorations of the differences caused by the exact form of the spectral density. The storage requirements and performance are compared with iterative quasi-adiabatic propagator path integral and iterative blip-summed path integral. Finally, the viability of using PCTNPI for simulating multistate problems is demonstrated taking advantage of the compressed representation.
description: 10 pages, 13 figures
Positive solutions to nonlinear p-Laplace equations with Hardy potential in exterior domains
Creators: name: Liskevich, Vitali
name: Lyakhova, Sofya
name: Moroz, Vitaly
Publisher: name: arXiv
Year: 2006
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35J60, 35B05, 35R45

description: We study the existence and nonexistence of positive (super) solutions to the nonlinear $p$-Laplace equation $$-Δ_p u-\fracμ{|x|^p}u^{p-1}=\frac{C}{|x|^σ}u^q$$ in exterior domains of ${\R}^N$ ($N\ge 2$). Here $p\in(1,+\infty)$ and $μ\le C_H$, where $C_H$ is the critical Hardy constant. We provide a sharp characterization of the set of $(q,σ)\in\R^2$ such that the equation has no positive (super) solutions. The proofs are based on the explicit construction of appropriate barriers and involve the analysis of asymptotic behavior of super-harmonic functions associated to the $p$-Laplace operator with Hardy-type potentials, comparison principles and an improved version of Hardy's inequality in exterior domains. In the context of the $p$-Laplacian we establish the existence and asymptotic behavior of the harmonic functions by means of the generalized Prüfer-Transformation.
description: 34 pages, 1 figure
Οι πόλεις της Παλαιστίνης κατά τη διάρκεια της μετάβασης από τη βυζαντινή στην αραβική κυριαρχία: το παράδειγμα της Ιερουσαλήμ, της Σκυθόπολης και της Caesarea Maritima
Creators: name: Θαθαροπούλου, Σοφία Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Παλαιστίνη-Βυζάντιο-Άραβες
Palestine-Byzantium-Arabs

description: Η παρούσα μεταπτυχιακή εργασία πραγματεύεται την εξέλιξη της μορφής των πόλεων της Παλαιστίνης, κατά τη διάρκεια των μεταβατικών αιώνων του Βυζαντίου (7ος-9ος). Εντάσσοντας τις επαρχίες της Παλαιστίνης στο ευρύτερο ιστορικό πλαίσιο της εποχής, περιγράφει τις αλλαγές που σημειώθηκαν στην εικόνα των πόλεων τους από τα τέλη του 6ου αιώνα και κυρίως μετά την κατάκτηση της περιοχής από τους Άραβες κατά την δ’ δεκαετία του 7ου αιώνα. Τα παραδείγματα στα οποία επικεντρώνεται είναι η Ιερουσαλήμ, η Σκυθόπολη και η Παράλιος Καισάρεια, επιχειρώντας να απαντήσει σε ερωτήματα όπως: Πως αλλάζουν οι πόλεις από αιώνα σε αιώνα; Ποιος ο ρόλος της αραβικής κατάκτησης στις όποιες αλλαγές; Μπορούν οι όροι ακμή και παρακμή να χαρακτηρίσουν το αποτέλεσμα αυτής της εξέλιξης στον 9ο αιώνα;
description: The present MA thesis discusses the evolution of the cities of Palestine, during the transitional era of Byzantium, between the 7th and 9th century. Subsuming the provinces of Palestine in the broader historical context of the period, it delineates the transformation of the form of their cities already from the 6th century, but mainly after the Arab conquest in the fourth decade of the 7th. The study focuses on the cities of Jerusalem, Scythopolis and Caesarea Maritima, in an attempt to answer the following questions: How does the form of the cities change century by century? What is the role of the Arab conquest in the transformation? Could anyone characterize the result of these modifications in the 9th century by the terms prosperity or decline?
Homodyne QPSK Detection for Quantum Key Distribution
Creators: name: Silva, M. B. Costa e
name: Xu, Q.
name: Agnolini, S.
name: Gallion, P.
name: Mendieta, F. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a QKD system with fainted pulses using self-homodyne coherent detection in optical fibers at 1543nm. BB84 protocol key is encoded in the optical phase using a twoelectrode Mach-Zehnder modulator, producing a QPSK modulation.
description: 3 pages, 4 figures, COTA/OSA Conference, Whistler, British Columbia, Canada, June 2006 2006
Εποικοδομικού τύπου εκπαίδευση με ΤΠΕ και ανάπτυξη δεξιοτήτων συνεργασίας των μαθητών: Εφαρμογή στο μάθημα της Πληροφορικής
Creators: name: Γεωργιάδης, Αναστάσιος Ηλία
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Υπολογιστική Σκέψη
Φύλλα Εργασίας
Scratch
Computational Thinking
Worksheets

description: Η Υπολογιστική Σκέψη (ΥΣ) είναι ένα σύνολο δεξιοτήτων και στάσεων ενώ ο εποικοδομισμός η κυρίαρχη θεωρία μάθησης τα τελευταία χρόνια. Σε αυτή την εργασία γίνεται προσπάθεια ανάπτυξης της ΥΣ, σε μαθητές της δευτεροβάθμιας εκπαίδευσης, με παράλληλη βελτίωση των ικανοτήτων τους τόσο στο Scratch όσο και στον προγραμματισμό γενικότερα, χρησιμοποιώντας Φύλλα Εργασίας (ΦΕ) στο Scratch 2.0 και ενσωματώνοντας στη διαδικασία αρχές του εποικοδομισμού.
description: Computational Thinking (CT) is an attitude and skill set while constructivism is considered as the dominant theory of learning over the last few years. In this thesis an attempt is made for the development of Computational Thinking in secondary school students and the improvement of both their skills in Scratch and programming in general, by using worksheets in Scratch 2.0 and incorporating into the process the principles of constructivism.
Nonlinearities and Parametric Amplification in Superconducting Coplanar Waveguide Resonators
Creators: name: Tholen, Erik A.
name: Ergul, Adem
name: Doherty, Evelyn M.
name: Weber, Frank M.
name: Gregis, Fabien
name: Haviland, David B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Experimental investigations of the nonlinear properties of superconducting niobium coplanar waveguide resonators are reported. The nonlinearity due to a current dependent kinetic inductance of the center conductor is strong enough to realize bifurcation of the nonlinear oscillator. When driven with two frequencies near the threshold for bifurcation, parametric amplification with a gain of +22.4 dB is observed.
description: 4 pages, 5 figures, 1 table. In version 2: Added appendix with model description and fits to measurements. Minor corrections and rephrasing
Communication optimization in Parsec : A parallel programming environment for multicomputers
Creators: name: Mulye, Sameer S.
Publisher: name: University of British Columbia
Year: 2009

description: Multicomputer (distributed memory MIMD machines) have emerged as inexpensive, yet powerful parallel computers that promise high computational performance. A parallel application running on these machines consists of a set of user processes running on different processors. The only way processes share data in this environment is by message passing which can become the bottleneck to obtaining high performance. This thesis examines the issues influencing communication in multicomputers. Two static analysis tools are designed: a mapping tool and runtime system for communication and synchronization. An efficient mapping of a parallel application onto a parallel computer is necessary to minimize the total communication cost. Delegating this task to the user makes application development a complex process as the user must know the underlying hardware. An automated hardware-independent mapping tool is designed to map arbitrary process graphs on a transputer-based multicomputer. A native runtime system on these multicomputers consists of message-passing primitives which are efficient but only support simple send and receive operations. A high-level runtime system provides functionalities such as flow control, buffering, and group communication using a wide range of primitives. However, these primitives are difficult to use and it is up to the user to select the optimal primitives for efficiency. Hence a message-passing library is designed for a transputer system. It is built on top of Trollius, an operating system for multicomputers, which offers a variety of functions, each with different combination of performance and functionality. The library includes a few communication primitives which provide a common interface for all the Trollius functions while maintaining the efficiency of the low-level functions. The mapping tool statically compiles a program structure info the configuration information and based on this information, the message-passing library selects the optimal Trollius functions. Parsec (the Parallel System for Efficient Computation), a parallel programming environment for multicomputers, is being developed at UBC. Our tools are integrated with Parsec and become the backbone in achieving high performance. Heterogeneity is one of the important design issues in Parsec. Currently these tools are available on two different hardware platforms: a transputer-based multicomputer and a cluster of Sun Sparc workstations. Thus the user can take advantage of either environment to write portable and efficient parallel applications.
XMM-Newton observations of SN1987A
Creators: name: Haberl, F.
name: Geppert, U.
name: Aschenbach, B.
name: Hasinger, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (abridged) We report on XMM-Newton observations of SN1987A in the Large Magellanic Cloud. The large collecting area telescopes together with the European Photon Imaging Cameras (EPIC) provide X-ray spectra with unprecedented statistical quality and make it possible to investigate the spectral evolution during the brightening observed since the discovery in X-rays. High resolution spectra from the Reflection Grating Spectrometers yield a complementary view and allow us to perform more detailed investigations of prominent emission lines. The X-ray spectra were modeled with two-temperature emission components from a hot plasma in collisional ionization equilibrium and in non-equilibrium (NEI). We find a temperature for the equilibrium component of 0.24+/-0.02 keV in January 2000 and April 2001 which increased to 0.30+/-0.02 keV in May 2003 and also an indication for a temperature increase in the hot NEI component from \~2 keV to ~3 keV. Emission line ratios inferred from the RGS spectra suggest temperatures as low as 100 eV and an increase in the ionization state of oxygen and neon consistent with the observed temperature increases. The fast readout of the EPIC-pn instrument yields X-ray fluxes free of CCD pile-up effects which we used to normalize pile-up corrections for the published Chandra fluxes. The corrected X-ray light curve of SN1987A in the 0.5-2.0 keV energy band is best represented by a linear increase up to about day 4000 after the explosion and an exponential rise afterwards until the last published Chandra observation on day 6716. Modeling the light curve by emission from the inner ring which is approximated by a circular torus a central density n_H = 1.15x10^4 cm^-3 is found. In this model the forward shock has just passed the center of the torus.
description: 9 pages, 5 figures, accepted for publication in Astronomy & Astrophysics
PFRL: Pose-Free Reinforcement Learning for 6D Pose Estimation
Creators: name: Shao, Jianzhun
name: Jiang, Yuhang
name: Wang, Gu
name: Li, Zhigang
name: Ji, Xiangyang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: 6D pose estimation from a single RGB image is a challenging and vital task in computer vision. The current mainstream deep model methods resort to 2D images annotated with real-world ground-truth 6D object poses, whose collection is fairly cumbersome and expensive, even unavailable in many cases. In this work, to get rid of the burden of 6D annotations, we formulate the 6D pose refinement as a Markov Decision Process and impose on the reinforcement learning approach with only 2D image annotations as weakly-supervised 6D pose information, via a delicate reward definition and a composite reinforced optimization method for efficient and effective policy training. Experiments on LINEMOD and T-LESS datasets demonstrate that our Pose-Free approach is able to achieve state-of-the-art performance compared with the methods without using real-world ground-truth 6D pose labels.
Ab-initio electronic and magnetic structure in La_0.66Sr_0.33MnO_3: strain and correlation effects
Creators: name: Ma, Chunlan
name: Yang, Zhongqin
name: Picozzi, Silvia
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The effects of tetragonal strain on electronic and magnetic properties of strontium-doped lanthanum manganite, La_{2/3}Sr_{1/3}MnO_3 (LSMO), are investigated by means of density-functional methods. As far as the structural properties are concerned, the comparison between theory and experiments for LSMO strained on the most commonly used substrates, shows an overall good agreement: the slight overestimate (at most of 1-1.5 %) for the equilibrium out-of-plane lattice constants points to possible defects in real samples. The inclusion of a Hubbard-like contribution on the Mn d states, according to the so-called "LSDA+U" approach, is rather ineffective from the structural point of view, but much more important from the electronic and magnetic point of view. In particular, full half-metallicity, which is missed within a bare density-functional approach, is recovered within LSDA+U, in agreement with experiments. Moreover, the half-metallic behavior, particularly relevant for spin-injection purposes, is independent on the chosen substrate and is achieved for all the considered in-plane lattice constants. More generally, strain effects are not seen to crucially affect the electronic structure: within the considered tetragonalization range, the minority gap is only slightly (i.e. by about 0.1-0.2 eV) affected by a tensile or compressive strain. Nevertheless, we show that the growth on a smaller in-plane lattice constant can stabilize the out-of-plane vs in-plane e_g orbital and significatively change their relative occupancy. Since e_g orbitals are key quantities for the double-exchange mechanism, strain effects are confirmed to be crucial for the resulting magnetic coupling.
description: 16 pages, 7 figures, to be published on J. Phys.: Condensed Matter
Farm Financial Conditions, by Region, January 1, 1989
Creators: name: Hanson, Gregory
name: Banker, David E.
name: Johnson, James D.
name: Hanson, Gregory
name: Banker, David E.
name: Johnson, James D.
Publisher: name: Unknown
Year: 1989
Subjects: Consumer/Household Economics
Financial Economics
Land Economics/Use

description: U.S. farm financial conditions were relatively stable in 1988 after improving significantly in 1987, according to the U.S. Department of Agriculture's annual Farm Costs and Returns Survey (FCRS). By the end of the year, about 46 percent of all farms represented by the survey were in a favorable financial position with positive net cash farm income and debts equal to or less than 40 percent of assets compared with 49 percent at the end of 1987. Net cash farm income was up by about 3 percent. Farm debt declined by 10 percent while assets increased in value by 2 percent.
Η παρουσία του Διονυσίου Σολωμού στο περιοδικό Νέα Εστία. Η πρώτη τριακονταετία (1927-1957).
Creators: name: Κονδύλης, Ιωάννης Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Σολωμός, Διονύσιος
Νέα Εστία (περιοδικό)
Πρόσληψη
Solomos, Dionysios
Nea Estia (journal)
Reception

description: Η παρούσα μεταπτυχιακή διπλωματική εργασία επιχειρεί την επισκόπηση της παρουσίας του εθνικού ποιητή Διονυσίου Σολωμού στο μακροβιότερο και ένα από τα σημαντικότερα περιοδικά λόγου και τέχνης, τη Νέα Εστία. Τα χρονικά όρια της έρευνας ξεκινούν από το πρώτο τεύχος του περιοδικού που κυκλοφόρησε στις 15 Απριλίου του 1927 και καταλήγουν στο τεύχος 731, που αποτελεί συγχρόνως, αφιέρωμα στον ποιητή εν όψει της επετείου των εκατό ετών από τον θάνατό του. Η εργασία δομείται σε δύο κύρια μέρη. Στο πρώτο πραγματοποιείται η παρουσίαση και ο σχολιασμός ορισμένων σημαντικών σταθμών της μακράς και πολυπρισματικής παρουσίας του ποιητή στο περιοδικό, ενώ στο δεύτερο συντάσσονται αναλυτικά ευρετήρια και πίνακες για την αρτιότερη οργάνωση και προσπέλαση του αποδελτιωμένου υλικού
description: This thesis attempts an overview of the presence of the national poet Dionysios Solomos in the longest and one of the most important literary journals of Greece, Nea Estia. The time limits of the research start from the first issue of the magazine that was released on April 15, 1927 and end in issue 731, which is simultaneously a tribute to the poet in view of the anniversary of one hundred years of his death. The project is structured in two main parts. In the first place the presentation and commentary of some important stations of long and multiperspectivity presence of the poet in the magazine, the second drawn detailed indexes and tables for better organization and access of indexed material
Absolute Branching Fraction Measurements for D^+ and D^0 Inclusive Semileptonic Decays
Creators: name: Adam, N. E.
name: Collaboration, CLEO
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present measurements of the inclusive branching fractions for the decays D^+ -> X e^+ nu_e and D^0 -> X e^+ nu_e, using 281 pb^-1 of data collected on the psi(3770) resonance with the CLEO-c detector. We find Br(D^0 ->Xe^+ν_e) = (6.46 \pm 0.17 \pm 0.13)% and Br((D^+ -> Xe^+nu_e) = (16.13 \pm 0.20 \pm 0.33)%. Using the known D meson lifetimes, we obtain the ratio Gamma{D^+}^sl/Gamma_{D^0}^sl= 0.985\pm 0.028\pm 0.015, confirming isospin invariance at the level of 3%. The positron momentum spectra from D^+ and D^0 have consistent shapes.
description: 6 pages postscript,also available through this http://www.lns.cornell.edu/public/CLNS/2006/
Development of a high sensitivity torsional balance for the study of the Casimir force in the 1-10 micrometer range
Creators: name: Lambrecht, A.
name: Nesvizhevsky, V. V.
name: Onofrio, R.
name: Reynaud, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss a proposal to measure the Casimir force in the parallel plate configuration in the $1-10μ$m range via a high-sensitivity torsional balance. This will allow to measure the thermal contribution to the Casimir force therefore discriminating between the various approaches discussed so far. The accurate control of the Casimir force in this range of distances is also required to improve the limits to the existence of non-Newtonian forces in the micrometer range predicted by unification models of fundamental interactions.
description: 10 pages, 2 figures
Optical conductivity of a Dirac-Fermi liquid
Creators: name: Sharma, Prachi
name: Principi, Alessandro
name: Maslov, Dmitrii L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A Dirac-Fermi liquid (DFL)--a doped system with Dirac spectrum--is an important example of a non-Galilean-invariant Fermi liquid (FL). Real-life realizations of a DFL include, e.g., doped graphene, surface states of three-dimensional (3D) topological insulators, and 3D Dirac/Weyl metals. We study the optical conductivity of a DFL arising from intraband electron-electron scattering. It is shown that the effective current relaxation rate behaves as $1/τ_{J}\propto \left(ω^2+4π^2 T^2\right)\left(3ω^2+8π^2 T^2\right)$ for $\max\{ω, T\}\ll μ$, where $μ$ is the chemical potential, with an additional logarithmic factor in two dimensions. In graphene, the quartic form of $1/τ_{J}$ competes with a small FL-like term, $\proptoω^2+4π^2 T^2$, due to trigonal warping of the Fermi surface. We also calculated the dynamical charge susceptibility, $χ_\mathrm{c}({\bf q},ω)$, outside the particle-hole continua and to one-loop order in the dynamically screened Coulomb interaction. For a 2D DFL, the imaginary part of $χ_\mathrm{c}({\bf q},ω)$ scales as $q^2ω\ln|ω|$ and $q^4/ω^3$ for frequencies larger and smaller than the plasmon frequency at given $q$, respectively. The small-$q$ limit of $\mathrm{Im} χ_\mathrm{c}({\bf q},ω)$ reproduces our result for the conductivity via the Einstein relation.
description: 28 pages, 10 figures
Issues of Employment Branding and the Psychological Contract: A Discussion
Creators: name: Shaheen, Joseph
Publisher: name: figshare
Year: 2021
Subjects: Organizational Behavioral Psychology

description: Employment branding (sometimes also referred to asemployee branding and employer branding) hasrecently garnered much attention from both academicscholars and practitioners alike. It’s becoming the newsought-after competitive advantage that recruiting leaderswill need to seek. Thus, organizations are now forced tomake considerable investments in their branding.
Quantum theory of redshift in de Sitter expanding universe
Creators: name: Cotaescu, Ion I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The quantum theory of the Maxwell free field in Coulomb gauge on the de Sitter expanding universe is completed with the technical elements needed for building a coherent quantum theory of redshift. Paying a special attention to the conserved observables and defining the projection operator selecting the detected momenta it is shown that the expectation values of the energies of the emitted and detected photons comply with the Lema\^ itre rule of Hubble's law. Moreover, the quantum corrections to the dispersions of the principal observables and new uncertainty relations are derived.
description: 26 pages, no figures
A selfadjoint variant of the time operator
Creators: name: de la Madrid, R.
name: Isidro, J. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the selfadjoint time operator recently constructed by one of the authors. We will show that this time operator must be interpreted as a ``selfadjoint variant'' of the time operator.
description: 7 pages
Inline measurement of leachates from bioglass immersion tests
Creators: name: Galusková, Dagmar
name: Kaňková, Hana
name: Dušan Galusek
Publisher: name: Zenodo
Year: 2018
Subjects: bioglass
kinetics
SBF

description: Inline measurement of leachates from bioglass immersion tests
description: {"references": ["Marques R.C., Loebenberg R., Almukainzi M. Simulated biological fluids with possible application in dissolution testing? Dissolution Technologies 18(3), 15\u201328 (2011)", "Kokubo T., Takadama H. How useful is SBF in predicting in vivo bone bioactivity? Biomaterials 27, 2907\u201315 (2006)", "Mi\u0161\u00edkov\u00e1 L., Galuskov\u00e1 D., Corrosion of E-glass fibers, security factor of nuclear power plants, Ceramics-Silik\u00e1ty 50 (2006)"]}
A model for the fast evaluation of prompt losses of energetic ions in stellarators
Creators: name: Velasco, J. L.
name: Calvo, I.
name: Mulas, S.
name: Sánchez, E.
name: Parra, F. I.
name: Cappa, Á.
name: team, the W7-X
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A good understanding of the confinement of energetic ions in non-axisymmetric magnetic fields is key for the design of reactors based on the stellarator concept. In this work, we develop a model that, based on the radially-local bounce-averaged drift-kinetic equation, classifies orbits and succeeds in predicting configuration-dependent aspects of the prompt losses of energetic ions in stellarators. Such a model could in turn be employed in the optimization stage of the design of new devices.
Μελέτη της ατμοσφαιρικής ρύπανσης στη Θεσσαλονίκη από τις καύσεις σε τζάκια
Creators: name: Αποστόλοβα-Πατρούγκα, Αλίκη Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Ατμοσφαιρική ρύπανση
Θεσσαλονίκη
Καύσεις σε τζάκια
Air Pollution
Thessaloniki
burning fireplaces

description: Το αντικείμενο αυτής της διατριβής ειδίκευσης είναι η μελέτη των κυριότερων ρύπων που προκύπτουν από τη χρήση καυσόξυλων στην ευρύτερη περιοχή της Θεσσαλονίκης. Η διατριβή επικεντρώνεται στην μελέτη των ΡΜ10 σωματιδίων και του μονοξειδίου του άνθρακα , καθώς αυτοί είναι οι κυριότεροι ρύποι που προκύπτουν από τη καύση βιομάζας. Αρχικά, παρατίθενται κάποιες θεωρητικές έννοιες που αφορούν τα είδη των ατμοσφαιρικών ρύπων, τις κύριες πηγές παραγωγής τους , τους μηχανισμούς απομάκρυνσής τους και το χρόνο παραμονής τους, γενικά στοιχεία για την ξυλεία, την αξιοποίησή της και την εκπομπή ρύπων από την καύση της. Στη συνέχεια αναφέρονται τα μορφολογικά ,κλιματολογικά και μετεωρολογικά στοιχεία της περιοχής της Θεσσαλονίκης και παρουσιάζονται αναλυτικά οι σταθμοί μέτρησης και καταγραφής συγκεντρώσεων ΡΜ10 και μονοξειδίου του άνθρακα. Έπειτα, παρουσιάζεται η στατιστική μελέτη της μηνιαίας, ωριαίας και μέγιστης διακύμανσης της σωματιδιακής ρύπανσης, ενώ μελετούνται και τα τοπικά μέγιστα της μέσης ωριαίας συγκέντρωσης των ΡΜ10 και CO ανά σταθμό για την περίοδο μελέτης 2013-2014 και την περίοδο αναφοράς 2001-2012. Έπειτα πραγματοποιείται μελέτη των υπερβάσεων των ορίων σωματιδιακής ρύπανσης που έχουν θεσπιστεί από την Ε.Ε. Τέλος, παρατίθενται τα κυριότερα συμπεράσματα τα οποία προέκυψαν από την επεξεργασία των μετρήσεων και την ανάλυση των αποτελεσμάτων
description: The objective of this specialization thesis is the study of the main pollutants resulting from the use of firewood in the region of Thessaloniki. The thesis focuses on the study of PM10 particulate matter and carbon monoxide, as these are the main pollutants resulting from the combustion of biomass. Originally listed some theoretical concepts regarding the types of air pollutants, the main sources of their production, their removal mechanisms and their dwell time, general information on timber, its use and the emission of pollutants from combustion. Then out morphological, climatic and meteorological data of the Thessaloniki region and presents the measurement stations and record concentrations of PM10 and carbon monoxide. Then, present the statistical study of the monthly, hourly and maximum variation of particle pollution, and studied and the local maxima of average hourly concentrations of PM10 and CO per station for the study period 2013-2014 and the period 2001-2012. Then place the study of exceedances of particulate pollution limits established by the EU Finally, they presented the main conclusions that emerged from the analysis of the measurements and analysis of results
First experiment on fission transients in highly fissile spherical nuclei produced by fragmentation of radioactive beams
Creators: name: Schmitt, C.
name: Nadtochy, P. N.
name: Heinz, A.
name: Jurado, B.
name: Kelic, A.
name: Schmidt, K. -H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report on a novel experimental approach for studying the dissipative spreading of collective motion in a meta-stable nuclear system, using, for the first time, highly fissile nuclei with spherical shape. This was achieved by fragmentation of 45 radioactive heavy-ion beams at GSI, Darmstadt. The use of inverse kinematics and a dedicated experimental set-up allowed for the identification in atomic number of both fission fragments. From the width of their charge distributions, a transient time of (3.3 +/- 0.7) 10-21 s is deduced for initially spherical nuclei.
description: 7 pages, 4 figures, background information at http://www-win.gsi.de/charms/
Identifying vital nodes by Achlioptas process
Creators: name: Qiu, Zhihao
name: Fan, Tianlong
name: Li, Ming
name: Lü, Linyuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: The vital nodes are the ones that play an important role in the organization of network structure or the dynamical behaviours of networked systems. Previous studies usually applied the node centralities to quantify the importance of nodes. Realizing that the percolation clusters are dominated by local connections in the subcritical phase and by global connections in the supercritical phase, in this paper we propose a new method to identify the vital nodes via a competitive percolation process that is based on an Achlioptas process. Compared with the existing node centrality indices, the new method performs overall better in identifying the vital nodes that maintain network connectivity and facilitate network synchronization when considering different network structure characteristics, such as link density, degree distribution, assortativity, and clustering. We also find that our method is more tolerant of noisy data and missing data. More importantly, compared with the unique ranking list of nodes given by most centrality methods, the randomness of the percolation process expands the possibility space of the optimal solutions, which is of great significance in practical applications.
description: 11 pages, 5 figures
Magnetic phases of one-dimensional lattices with 2 to 4 fermions per site
Creators: name: Nikkarila, J. -P.
name: Koskinen, M.
name: Reimann, S. M.
name: Manninen, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the spectral and magnetic properties of one-dimensional lattices filled with 2 to 4 fermions (with spin 1/2) per lattice site. We use a generalized Hubbard model that takes account all interactions on a lattice site, and solve the many-particle problem by exact diagonalization. We find an intriguing magnetic phase diagram which includes ferromagnetism, spin-one Heisenberg antiferromagnetism, and orbital antiferromagnetism.
description: 8 pages, 6 figures
Η στάση των νέων αγροτών στους αγροτικούς συνεταιρισμούς της Ελλάδας
Creators: name: Μπακατσής, Ιωάννης Θωμάς
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Αγροτικοί συνεταιρισμοί
Νέοι αγρότες
Στάση
Agricultural cooperatives
New farmers
Attitude

description: Ο κύριος σκοπός της εργασίας είναι να εξετάσει τη στάση των νέων αγροτών απέναντι στους αγροτικούς συνεταιρισμούς της Ελλάδας. Τα δεδομένα συγκεντρώθηκαν από νέους αγρότες σε διάφορες περιοχές της Ελλάδας, από την Κεντρική Μακεδονία μέχρι την Κρήτη, με τη βοήθεια δομημένου ερωτηματολογίου. Ακολούθως, επεξεργάστηκαν με το πρόγραμμα SPSS και αναλύθηκαν με τη βοήθεια του στατιστικού δείκτη χ2 και της Ανάλυσης Κύριων Συνιστωσών (PCA). Οι νέοι αγρότες που συμμετείχαν στην έρευνα μετέχουν στο μέτρο στήριξης 112 της ΚΑΠ (2007-2013) και ο συνολικός αριθμός ερωτηματολογίων που χρησιμοποιήθηκαν στην ανάλυση ήταν 249. Τα αποτελέσματα δείχνουν, ότι ένας από τους λόγους για τους οποίους οι νέοι αγρότες επιλέγουν να μη γίνουν μέλη σε αγροτικούς συνεταιρισμούς, είναι επειδή θεωρούν τη διοίκηση αναξιόπιστη. Ακόμα, η απόφαση για ένταξη ή μη σε κάποιον αγροτικό συνεταιρισμό, επηρεάζεται εμφανώς και από την εκπαίδευση των νέων αγροτών, όπως επίσης και από το ετήσιο οικογενειακό τους εισόδημα
description: The main purpose of this paper is to examine the new farmers’ attitude towards the agricultural cooperatives in Greece. The data were collected from young farmers in different regions of Greece from Central Macedonia to Crete, using a structured questionnaire, elaborated by the SPSS program and analyzed by the chi-square method and the principal components analysis. The young farmers that took part in this research, participate in measure 112 of CAP (2007-2013) and the total number of questionnaires used in the analysis were 249. The results show that the main reason that young farmers choose not to be members in agricultural cooperatives is because they consider the BoD unfaithful. Furthermore the decision of the participation in an a cooperative is influenced by the new farmers’ education and by their annual family income
The PSCz Dipole Revisited
Creators: name: Basilakos, Spyros
name: Plionis, Manolis
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We re-examine the gravitational acceleration (dipole) induced on the Local Group of galaxies by the Infrared Astronomical Satellite (IRAS) galaxy distribution of the Point Source Catalogue redshift survey (PSCz). We treat the cirrus-affected low galactic latitudes by utilizing a spherical harmonic expansion of the galaxy surface density field up to the octapole order. We find strong indications for significant contributions to the Local Group motion from depths up to $\sim 185$ $h^{-1}$ Mpc and possible contribution even from $\sim 210$ $h^{-1}$ Mpc, in agreement with the recent analysis of Kocevski & Ebeling of a whole sky X-ray cluster survey.What changes with respect to the previous PSCz dipole analyses is: (a) the large-scale dipole contributions and (b) an increase of the overall dipole amplitude due to the important contribution of the local volume ($\mincir 4 h^{-1}$Mpc), which we now take into account. This results in a lower value of the $β(\equiv Ω_{\rm m}^{0.6}/b)$ parameter, which we find to be $β_{\rm IRAS} \simeq 0.49$ in real space. Therefore, for the concordance cosmological model ($Ω_{\rm m}=1-Ω_Λ=0.3$) the IRAS galaxies bias factor is $b_{\rm IRAS}\simeq 1$ which means that IRAS galaxies are good traces of the underlying matter distribution.
description: 7 pages, 3 figures, MNRAS in press
Bitcoin's Crypto Flow Network
Creators: name: Fujiwara, Yoshi
name: Islam, Rubaiyat
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Finance (q-fin.GN)
subject: Cryptography and Security (cs.CR)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: How crypto flows among Bitcoin users is an important question for understanding the structure and dynamics of the cryptoasset at a global scale. We compiled all the blockchain data of Bitcoin from its genesis to the year 2020, identified users from anonymous addresses of wallets, and constructed monthly snapshots of networks by focusing on regular users as big players. We apply the methods of bow-tie structure and Hodge decomposition in order to locate the users in the upstream, downstream, and core of the entire crypto flow. Additionally, we reveal principal components hidden in the flow by using non-negative matrix factorization, which we interpret as a probabilistic model. We show that the model is equivalent to a probabilistic latent semantic analysis in natural language processing, enabling us to estimate the number of such hidden components. Moreover, we find that the bow-tie structure and the principal components are quite stable among those big players. This study can be a solid basis on which one can further investigate the temporal change of crypto flow, entry and exit of big players, and so forth.
description: 39 pages, 18 Figures; "Blockchain in Kyoto 2021" conference; forthcoming in JPS Conference Proceedings
Discontinuous Molecular Dynamics for Semi-Flexible and Rigid Bodies
Creators: name: de la Pena, Lisandro Hernandez
name: van Zon, Ramses
name: Schofield, Jeremy
name: Opps, Sheldon B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A general framework for performing event-driven simulations of systems with semi-flexible or rigid bodies interacting under impulsive torques and forces is outlined. Two different approaches are presented. In the first, the dynamics and interaction rules are derived from Lagrangian mechanics in the presence of constraints. This approach is most suitable when the body is composed of relatively few point masses or is semi-flexible. In the second method, the equations of rigid bodies are used to derive explicit analytical expressions for the free evolution of arbitrary rigid molecules and to construct a simple scheme for computing interaction rules. Efficient algorithms for the search for the times of interaction events are designed in this context, and the handling of missed interaction events is discussed.
description: 16 pages, double column revtex
Ηλεκτρονικό εμπόριο και σημασιολογικός ιστός
Creators: name: Κράβαρης, Αθανάσιος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Ηλεκτρονικό Εμπόριο
Σημασιολογικός Ιστός
Οντολογίες
e-Commerce
Semantic Web
Ontologies

description: Αντικείμενο της παρούσας εργασίας είναι η δυναμική ενσωμάτωση επισημειώσεων μεταδεδομένων σε ιστοσελίδες που θα καταφέρουν να τραβήξουν την προσοχή αλλά και να χρησιμοποιηθούν αποδοτικά από μηχανές και εφαρμογές. Απώτερος στόχος είναι η μεγιστοποίηση της ποιότητας ενός ηλεκτρονικού καταστήματος και η καλύτερη ανιχνευσιμότητα των πληροφοριών του από μηχανές αναζήτησης του Σημασιολογικού Ιστού. Μετά από την απαραίτητη περιγραφή του Σημασιολογικού Ιστού και του Ηλεκτρονικού Εμπορίου, αναλύεται η οντολογία GoodRelations, ένα δημοφιλές λεξιλόγιο για το ηλεκτρονικό εμπόριο που αποτελεί κεντρικό στοιχείο της παρούσας εργασίας. Έπειτα ακολουθεί αναλυτική περιγραφή, με παράθεση αντίστοιχων στιγμιοτύπων, του ηλεκτρονικού καταστήματος που αναπτύχθηκε στην εργασία και ονομάστηκε TechEshop. Πρόκειται για ένα κατάστημα ειδών τεχνολογίας, όπως Η/Υ και ευφυών τηλεφώνων, που ενσωματώνει τη χρήση της οντολογίας GoodRelations
description: The subject of this thesis is the dynamic integration of metadata annotations to webpages that will be able to attract attention and be better traceable by Semantic Web search engines. The ultimate goal is to maximize the qualitiy of an eshop. After a necessary description of the Semantic Web and Electronic Commerce, the GoodRelations ontology is analyzed. It is a popular vocabulary for e-commerce and it is a core element in this thesis. Next follows a detailed presentation, along with screenshots, of the implemented eshop, called TechEshop. It is a technology store, providing among others computers and smartphones, that that incorporates the use of ontology GoodRelations
การดูแลสุขภาพเชิงพื้นบ้าน: กรณีศึกษาชนชาติพันธุ์ลาหู่แดงในจังหวัดเชียงราย
Creators: name: สุนิดา อรรถอนุชิต, รอฮานิ เจะอาแซ
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2019
Subjects: ชนชาติพันธุ์, การดูแลสุขภาพ, ลาหู่, indigenous people, health care practice, Lahu

description: วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์, 30, 2, 155-164
Financial Performance of Specialized Hog Farms, 1987
Creators: name: Dubman, Robert
name: Hanson, Gregory
name: Dubman, Robert
name: Hanson, Gregory
Publisher: name: Unknown
Year: 1989
Subjects: Agricultural Finance
Financial Economics
Livestock Production/Industries
Production Economics

description: Specialized hog farms--those with at least 50 percent of their production value from hogs and with at least $40,000 in total crop and livestock production—had more favorable financial conditions in 1987 than most other types of commodity specialty farms. Since 1985, net returns have increased 87 percent and the number of financially stressed farms has decreased 61 percent. Small farms with sales of $40,000 to $100,000 had the least favorable costs and returns. Production was concentrated In four adjoining areas: the Northern Plains, the western Corn Belt, the eastern Corn Belt, and the Southeast. Specialized hog farms in the eastern Corn Belt had the highest net returns and lowest costs.