cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dynamical fission of the quasiprojectile and isospin equilibration for the system 80Kr+ 48 Ca at 35 MeV/nucleon
Creators: name: Piantelli, S.
name: Casini, G.
name: Ono, A.
name: Poggi, G.
name: Pastore, G.
name: Barlini, S.
name: Boiano, A.
name: Bonnet, E.
name: Borderie, B.
name: Bougault, R.
name: Bruno, M.
name: Buccola, A.
name: Camaiani, A.
name: Chbihi, A.
name: Cicerchia, M.
name: Cinausero, M.
name: DAgostino, M.
name: Degerlier, M.
name: Duenas, J.
name: Fable, Q.
name: Fabris, D.
name: Frankland, J. D.
name: Frosin, C.
name: Gramegna, F.
name: Gruyer, D.
name: Henri, M.
name: Kordyasz, A.
name: Kozik, T.
name: LeNeindre, N.
name: Lombardo, I.
name: Lopez, O.
name: Mantovani, G.
name: Marchi, T.
name: Morelli, L.
name: Olmi, A.
name: Ottanelli, P.
name: Parlog, M.
name: Pasquali, G.
name: Stefanini, A. A.
name: Tortone, G.
name: Upadhyaya, S.
name: Valdre, S.
name: Verde, G.
name: Vient, E.
name: Vigilante, M.
name: Alba, R.
name: Maiolino, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Experimental results concerning the dynamical fission of quasiprojectiles in semiperipheral collisions for the system 80 Kr+ 48 Ca at 35 MeV/nucleon are presented. Data have been collected with four blocks of the FAZIA setup in the first physics experiment of the FAZIA Collaboration. The degree of isospin equilibration between the two fission fragments and its dependence on their charge asymmetry is investigated. The data are compared with the results of the AMD model coupled to GEMINI as an afterburner, in order to get hints about the timescale of the process.
Η συμβολή των γονέων στην περιβαλλοντική εκπαίδευση των μαθητών του δημοτικού σχολείου: ερευνητική προσέγγιση.
Creators: name: Βασιλούδης, Ιωάννης
name: Γκούσια-Ρίζου, Μαρία
name: Σδράλη, Δέσποινα Β.
name: Αμπελιώτης, Κωνσταντίνος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Due to rapid social, economic and environmental changes, families play a sig¬nificant role within the framework of Education for Sustainable Development. The role of parents is particularly important and decisive during children’s de¬velopment. The aim of this paper is to explore those attitudes of the parents that help their children develop pro-environmental attitudes. Results indicate that there is a common agreement on issues such as: i) the fact that the protec¬tion of environment improves the quality of life and ii) environmental sensi¬tivity constitutes a factor of significant importance for shaping the children’s character. In addition, five clusters of parents attitudes are emerging. Although there are parents that try to help their children establish a pro-environmental value system and attitudes by deliberate and systematic pedagogical actions or their daily choices, this practice does not hold for the majority of the parents. Thus, we can argue that the parents’ activities do not help their children to develop stale pro-environmental attitudes to a great extent.
description: Παιδαγωγική Επιθεώρηση, Vol. 47 (2009)
Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis
Creators: name: Powell, B. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a group theoretic analysis of several classes of organic superconductors. We argue that highly frustrated half-filled layered organic superconductors, such as kappa-(ET)_2Cu2(CN)_3 (where ET is BEDT-TTF) and beta'-[Pd(dmit)_2]_2X, undergo two superconducting phase transitions, the first from the normal state to a d-wave superconductor and the second to a d+id state. We show that the monoclinic distortion of kappa-(ET)_2Cu(NCS)_2 means that the symmetry of its superconducting order parameter is different from that of orthorhombic kappa-(ET)_2Cu[N(CN)_2]Br. We propose that quarter filled layered organic superconductors, e.g., theta-(ET)_2I_3, have d_{xy}+s order parameters.
description: 4 pages, 2 figures
NO[sub x] and N2O emissions from circulating fluidized bed combustion
Creators: name: Sung, Lawrence Yu Jen
Publisher: name: University of British Columbia
Year: 2009

description: Parametric studies on NO[sub x] and N₂O emissions from circulating fluidized bed combustion were conducted by analyzing NO[sub x] and N₂O emission data from the UBC pilot plant facility. The O₂, NO[sub x] and N₂O concentration profiles in the combustor were also investigated. A comprehensive NO/ N₂O model was developed to predict the NO and N₂O emissions from CFB under various operating conditions and the axial NO and N₂O concentration profiles. The parametric studies were carried out by combusting four different fuels: Conoco coke, Poplar River lignite, CANMET pitch and Mt. Klappan anthracite, with the volatile content ranging from 6.5% (Mt. Klappan anthracite) to 67.7% (CANMET pitch) and the fuel nitrogen content varying from 0.9 wt % (Mt. Klappan anthracite and Poplar River lignite) to 1.9% (Conoco coke). The effects of fuel properties, temperature, excess air (0₂%) and limestone addition on the N[sub x]O and N₂O emissions were investigated with an emphasis on reducing both species simultaneously. Both axial and lateral O₂, NO[sub x] and N₂O concentration gradients existed in a CFBC riser, shedding some light on the formation and reduction mechanism of N[sub x]O and N₂O and indicating that a core-annulus structure existed in a CFB riser. Fifteen NO and N₂O formation and reduction reactions were included in the NO and N₂O model developed, with eight homogeneous and seven heterogeneous reactions. The reaction rate of each reaction was expressed in terms of global kinetics. Global kinetics for the gas phase reactions involved were derived from Hulgaard's (1991) experiments with HCN, NH₃ and N₂O in a plug flow reactor. The NO/ N₂O model, based on a modified Senior and Brereton's model, could predict N[sub x]O and N₂O emissions as functions of operating conditions. The NO/ N₂O model was applied to the Conoco coke combustion in the UBC pilot plant. With three unknown reaction rate constants in the NO and N₂O reaction scheme serving as fitting parameters, the predicted NO and N₂O concentration profiles showed fair agreement with the experimental one. Sensitivity analysis was performed on the reaction rate constants involved in the proposed reaction scheme, showing the relative importance of these reactions in the NO and N₂O reaction scheme. The effects of excess air, limestone addition and the height of secondary air port on the NO and N₂O emissions predicted by the NO/ N₂O model qualitatively agree with what have been observed from the UBC pilot plant. The NO/ N₂O model predicted that there was an optimized P/S ratio for the NO .and N₂O emission control for Conoco coke combustion and that the CFB riser with an abrupt exit would result in lower NO and N₂O emissions.
Εξουσιαστικές και συνεργατικές σχέσεις από τη σχολική διαδικασία στη δημοσιογραφική πρακτική.
Creators: name: Τσιτσανούδη-Μαλλίδη, Νικολέττα
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: The educational value of journalistic speech causes referring to basic signifi¬cations from school class to contemporary journalistic practice. On the basis of research studies in the field of bilingual education, in the present essay, we attempt to answer and fully support the question of how collaborative and co¬ercive relations of power could be applied in the field of journalism. In the case of collaborative relations, it is stated than between the journalist and the readers or viewers, just like between the teacher and the pupils, conditions of development of social and lingual identities of the groups participating in the teaching procedure or communication are created. On the contrary, by applying and developing relations of suppression, the at any time existing “inferior” group gets eventually used to functioning as a pathetic existence after they have put themselves into a state of being guilty about the submitting weakness.
description: Παιδαγωγική Επιθεώρηση, Vol. 47 (2009)
Cancellation of soft and collinear divergences in noncommutative QED
Creators: name: Mirza, B.
name: Zarei, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we investigate the behavior of non-commutative IR divergences and will also discuss their cancellation in the physical cross sections. The commutative IR (soft) divergences existing in the non-planar diagrams will be examined in order to prove an all order cancellation of these divergences using the Weinberg's method. In non-commutative QED, collinear divergences due to triple photon splitting vertex, were encountered, which are shown to be canceled out by the non-commutative version of KLN theorem. This guarantees that there is no mixing between the Collinear, soft and non-commutative IR divergences.
Reconfigurable Computation in Spiking Neural Networks
Creators: name: Neves, Fabio Schittler
name: Timme, Marc
Publisher: name: arXiv
Year: 2020
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: The computation of rank ordering plays a fundamental role in cognitive tasks and offers a basic building block for computing arbitrary digital functions. Spiking neural networks have been demonstrated to be capable of identifying the largest k out of N analog input signals through their collective nonlinear dynamics. By finding partial rank orderings, they perform k-winners-take-all computations. Yet, for any given study so far, the value of k is fixed, often to k equal one. Here we present a concept for spiking neural networks that are capable of (re)configurable computation by choosing k via one global system parameter. The spiking network acts via pulse-suppression induced by inhibitory pulse-couplings. Couplings are proportional to each units' state variable (neuron voltage), constituting an uncommon but straightforward type of leaky integrate-and-fire neural network. The result of a computation is encoded as a stable periodic orbit with k units spiking at some frequency and others at lower frequency or not at all. Orbit stability makes the resulting analog-to-digital computation robust to sufficiently small variations of both, parameters and signals. Moreover, the computation is completed quickly within a few spike emissions per neuron. These results indicate how reconfigurable k-winners-take-all computations may be implemented and effectively exploited in simple hardware relying only on basic dynamical units and spike interactions resembling simple current leakages to a common ground.
Enhancing Cybersecurity Through Optical Character Recognition (OCR)
Creators: name: Samarth Math
name: Chetan Chaudhari
name: Dr. Sarika Jadhav
Publisher: name: Zenodo
Year: 2023

description: Technological innovation is rapidly accelerating in a Cyber world that is powered by social networks,online transactions, cloud computing, and automated processes. The technology evolution often brings itwith the advancement of cybercrime. Which leads to Evolve in Security tools, techniques, and attack types,allowing attackers to penetrate more complex, even while remaining undetected. To make our systemsmore secure, it is crucial to know about those attacks, before and after they occur. Cyber security expertssuggest that it is hard to predict an attack without knowing how vulnerable a network is. Therefore, it isimportant to analyzea networkto determine top vulnerabilities, which can give the best idea of how toshield the network. It is the ever-evolving nature of Cyber Attacks that represents the main challenge ofcyber security specialist. In this paper, we will discuss the importance of cyber security and the differentrisks that are present in the current security era. We will also evaluate countermeasures that can beimplemented when attacks occur with the proposed process model of File Upload Vulnerability. Thisresearch also seeks to identify vulnerabilities through attacks and to provide mitigation for thosevulnerabilities.
Αριθμητική μελέτη δομικών συστημάτων εκκλησιών που υποβάλλονται σε σεισμικές φορτίσεις.:
Creators: name: Κοζικόπουλος, Ευάγγελος Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Σεισμική συμπεριφορά
Αριθμητική μελέτη
Εκκλησίες
Seismic behavior
Numerical study
Churches

description: Στις περισσότερες των περιπτώσεων οι κατασκευές από φέρουσα τοιχοποιία κατέχουν μία ιδιαίτερη θέση στο κτιριακό δυναμικό μιας περιοχής καθώς πρόκεινται για δομήματα μνημειακού χαρακτήρα. Αρχοντικά και ναοί είναι ως επί το πλείστο το είδος αυτών των κτιρίων καθότι το επιστημονικό υπόβαθρο για την ανέγερση σύγχρονων κατασκευών από φέρουσα τοιχοποιία έχει αναπτυχθεί μόλις τις τελευταίες δεκαετίες. Οι ναοί ,που είναι και τα σχετικά δομήματα στα οποία αναφέρεται η παρούσα διπλωματική εργασία, έχουν επιβαρυνθεί ανά τον χρόνο με πολλές και συχνά έντονες σεισμικές δονήσεις. Με αφορμή τις ισχυρές δονήσεις της περιοχής της Κεφαλονιάς που έλαβαν χώρα τον χειμώνα του 2014 εκπονείται η παρούσα εργασία με στόχο τη διερεύνηση της απόκρισης των ναών από φέρουσα τοιχοποιία. Πιο συγκεκριμένα, μετρήθηκαν οι διαστάσεις 12 ναών της περιοχής της Παλικής οι οποίες υπέστησαν από μικρές έως μεγάλες βλάβες. Στη συνέχεια χρησιμοποιώντας τα δεδομένα των καταγραφών των ισχυρών δονήσεων της 3ης Φεβρουαρίου 2014 καθώς και την επιρροή του είδους του εδάφους έδρασης έγιναν στατικές αναλύσεις σε 5 αριθμητικά προσομοιώματα ναών. Η επιρροή του εδάφους λήφθηκε υπόψη για τις περιπτώσεις ενός σκληρού και ενός μαλακού εδάφους. Αφού αναλύθηκαν τα προσομοιώματα έγινε εξαγωγή των αποτελεσμάτων και επαληθεύτηκαν τα σημεία των ναών όπου υπέστησαν βλάβες. Η αποτίμηση έδειξε πως όχι μόνο δικαιολογείται η εμφάνιση των βλαβών που προκλήθηκαν σε αυτές αλλά σε ορισμένες των περιπτώσεων πως οι υπολογιζόμενες βλάβες ήταν μεγαλύτερες των πραγματικών.
description: In most cases the construction of masonry holds a special place in the building stock of an area as they regard monumental structures. These kind of buildings are mostly mansions and temples as the scientific basis for the construction of modern construction of masonry has only developed in the last decades. The temples, being the relevant structures that this project refers to, were charged with many and often intense earthquakes over the years. In response to strong vibrations in the region of Kefalonia that occurred in the winter of 2014, this work is ongoing to investigate the response of the churches of masonry. Specifically, the dimensions 12 temples were measured in the region of Paliki which suffered from minor to major injuries. Subsequently, using the data records of the powerful vibrations of February 3, 2014 and the influence of the type of soil bearing, static analyzes were performed in 5 temples that were simulated numerically. The influence of soil was taken into consideration for hard and soft ground. By analyzing the models, the results that were exported verified the points where the temples were damaged. The evaluation showed that not only is the appearance of the damage caused to them justified, but in some cases the estimated damage was far greater than the actual one.
Proton Stability, Dark Matter and Light Color Octet Scalars in Adjoint SU(5) Unification
Creators: name: Perez, Pavel Fileviez
name: Iminniyaz, Hoernisa
name: Rodrigo, German
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The unification of gauge interactions in the context of Adjoint SU(5) and its phenomenological consequences are investigated. We show the allowed mass spectrum of the theory which is compatible with proton decay, and discuss the possibility to have a cold dark matter candidate. Due to the upper bounds on the proton decay partial lifetimes, tau (p --> K^+ nubar) < 9.3 10^{36} years and tau(p --> pi^+ nubar) < 3.0 10^{35} years, the theory could be tested at future proton decay experiments. The theory predicts also light scalar color octets which could be produced at the Large Hadron Collider.
description: 20 pages, 8 figures, minor corrections, one reference added, to appear in Physical Review D
An introduction to the theory of citing
Creators: name: Simkin, M. V.
name: Roychowdhury, V. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Statistical analysis of repeat misprints in scientific citations leads to the conclusion that about 80% of scientific citations are copied from the lists of references used in othe papers. Based on this finding a mathematical theory of citing is constructed. It leads to the conclusion that a large number of citations does not have to be a result of paper's extraordinary qualities, but can be explained by the ordinary law of chances.
Διοικητικά στελέχη στην Πρωτοβάθμια Εκπαίδευση: προθέσεις, στάσεις, υποκειμενικά πρότυπα και αντιληπτός συμπεριφορικός έλεγχος.
Creators: name: Φασούλης, Κώστας Β.
name: Κουτρομάνος, Γιώργος
name: Αλεξόπουλος, Νίκος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Ajzen's and Fishbein’s Theory of Reasoned Action (TRA) and Ajzen s Theory of Planned Behavior (TPB) were used to predict teachers’ intention to become administrative executives of education during their career. Participants were 83 teachers of primary education who completed measures of TRA and TPB. Data were analyzed using Pearson correlation and hierarchical regression analysis. Results showed that data fitted the TRA and TPB model well and ex¬plained respondents’ intention. Attitude towards to become administrative ex¬ecutives of education and perceived behavioral control were found to be related to teachers’ intention. Implications for theory, practice and research are discussed.
description: Παιδαγωγική Επιθεώρηση, Vol. 47 (2009)
Hearings and mishearings: decrypting the spoken word
Creators: name: Mehta, Anita
name: Luck, Jean-Marc
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We propose a model of the speech perception of individual words in the presence of mishearings. This phenomenological approach is based on concepts used in linguistics, and provides a formalism that is universal across languages. We put forward an efficient two-parameter form for the word length distribution, and introduce a simple representation of mishearings, which we use in our subsequent modelling of word recognition. In a context-free scenario, word recognition often occurs via anticipation when, part-way into a word, we can correctly guess its full form. We give a quantitative estimate of this anticipation threshold when no mishearings occur, in terms of model parameters. As might be expected, the whole anticipation effect disappears when there are sufficiently many mishearings. Our global approach to the problem of speech perception is in the spirit of an optimisation problem. We show for instance that speech perception is easy when the word length is less than a threshold, to be identified with a static transition, and hard otherwise. We extend this to the dynamics of word recognition, proposing an intuitive approach highlighting the distinction between individual, isolated mishearings and clusters of contiguous mishearings. At least in some parameter range, a dynamical transition is manifest well before the static transition is reached, as is the case for many other examples of complex systems.
description: 21 pages, 4 figures, 3 tables. To appear in Advances in Complex Systems
Η σχέση κοινωνικής νόησης – γνωστικού ελέγχου σε ηλικιωμένα άτομα: σύγκριση με νέους και μεσήλικες.:
Creators: name: Ναζλίδου, Ελενα-Ιωάννα Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Κοινωνική νόηση
Γήρας
Γνωστικός έλεγχος
Social cognition
Aging
Cognitive control

description: Η κοινωνική νόηση αποτελεί το άθροισμα των ικανοτήτων εκείνων, οι οποίες επιτρέπουν στα άτομα να αλληλεπιδρούν μεταξύ τους. Προκειμένου να γίνει αντιληπτός ο εαυτός μας και οι άλλοι, είναι απαραίτητη η αναπαράσταση τόσο των δικών μας νοητικών καταστάσεων, όσο και των άλλων προσώπων. Η ικανότητα αυτή καλείται Θεωρία του Νου και αποτελεί μία από τις πτυχές της κοινωνικής νόησης. Η παρούσα έρευνα αποσκοπούσε στη διερεύνηση της άμεσης και έμμεσης επίδρασης, μέσω του γνωστικού ελέγχου και της αναγνώρισης των βασικών συναισθημάτων, της ηλικίας, των ατομικών – δημογραφικών παραγόντων και βασικών βιοδεικτών που συνδέονται με τη αγγειακή γήρανση, σε διάφορες διαστάσεις της κοινωνικής νόησης κατά την ενήλικη ζωή. Σύμφωνα με τα αποτελέσματά της, η ηλικία επιδρά αρνητικά και μόνον έμμεσα, μέσω του γνωστικού ελέγχου σε ορισμένες διαστάσεις της κοινωνικής νόησης. Συμπερασματικά, θα μπορούσε να υποστηριχθεί ότι υπάρχουν τουλάχιστον ορισμένες πτυχές της κοινωνικής νόησης, οι οποίες σε υγιείς ενήλικες εμφανίζονται ανθεκτικές ως προς τις αρνητικές επιδράσεις που ασκούνται από το γνωστικό γήρας.
description: Social cognition is the sum of the abilities that allow individuals to interact with each other, and takes place at automatic and controlled stages of cognitive and affective processing, to process both verbal and nonverbal cues. In fact, in order to perceive both the self and the other, a person has to represent their mental states and infer differences between them. All these processes are included under the complex umbrella concept of Theory of Mind (ToM). This study aimed at examining the direct and indirect, via cognitive control and emotion recognition, effects of age and other individual-demographic factors on adults’ ToM. The all-inclusive path model confirmed, showed that age had a significant negative indirect effect, via cognitive control, on ToM, only as the ability to interpret nonliteral language. ToM as the ability of knowing what the other is thinking or feeling and as social mental verb understanding was not affected by any factor. Therefore, it could be supported that there are at least some aspects of ToM in cognitively healthy adults that are resistant to negative effects of cognitive aging.
The Connection Between Inertial Forces and the Vector Potential
Creators: name: Martins, Alexandre A.
name: Pinheiro, Mario J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Physics (physics.class-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: . The inertia property of matter is discussed in terms of a type of induction law related to the extended charged particle's own vector potential. Our approach is based on the Lagrangian formalism of canonical momentum writing Newton's second law in terms of the vector potential and a development in terms of obtaining retarded potentials, that allow an intuitive physical interpretation of its main terms. This framework provides a clear physical insight on the physics of inertia. It is shown that the electron mass has a complete electromagnetic origin and the covariant equation obtained solves the "4/3 mass paradox". This provides a deeper insight into the significance of the main terms of the equation of motion. In particular a force term is obtained from the approach based on the continuity equation for momentum that represents a drag force the charged particle feels when in motion relatively to its own vector potential field lines. Thus, the time derivative of the particle's vector potential leads to the acceleration inertia reaction force and is equivalent to the Schott term responsible for the source of the radiation field. We also show that the velocity dependent term of the particle's vector potential is connected with the relativistic increase of mass with velocity and generates a stress force that is the source of electric field lines deformation. This understanding broadens the possibility to manipulate inertial mass and potentially suggests some mechanisms for possible applications to electromagnetic propulsion and the development of advanced space propulsion physics.
description: 13 pages, 3 figures, to appear in STAIF (Space Technology and Applications International Forum) 2007 Conferences Proceedings
Asymptotic correctability of Bell-diagonal qudit states and lower bounds on tolerable error probabilities in quantum cryptography
Creators: name: Ranade, Kedar S.
name: Alber, Gernot
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The concept of asymptotic correctability of Bell-diagonal quantum states is generalised to elementary quantum systems of higher dimensions. Based on these results basic properties of quantum state purification protocols are investigated which are capable of purifying tensor products of Bell-diagonal states and which are based on $B$-steps of the Gottesman-Lo-type with the subsequent application of a Calderbank-Shor-Steane quantum code. Consequences for maximum tolerable error rates of quantum cryptographic protocols are discussed.
description: submitted to J. Phys. A
Gravitational Waves in Higher Order Teleparallel Gravity
Creators: name: Capozziello, Salvatore
name: Capriolo, Maurizio
name: Caso, Loredana
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The teleparallel equivalent of higher order Lagrangians like $L_{\Box R}=-R+a_{0}R^{2}+a_{1}R\Box R$ can be obtained by means of the boundary term $B=2\nabla_μT^μ$. In this perspective, we derive the field equations in presence of matter for higher-order teleparallel gravity considering, in particular, sixth-order theories where the $\Box$ operator is linearly included. In the weak field approximation, gravitational wave solutions for these theories are derived. Three states of polarization are found: the two standard $+$ and $\times$ polarizations, namely 2-helicity massless transverse tensor polarizations, and a 0-helicity massive, with partly transverse and partly longitudinal scalar polarization. Moreover, these gravitational waves exhibit four oscillation modes related to four degrees of freedom: the two classical $+$ and $\times$ tensor modes of frequency $ω_{1}$, related to the standard Einstein waves with $k^{2}_{1}=0$; two mixed longitudinal-transverse scalar modes for each frequencies $ω_{2}$ and $ω_{3}$, related to two different 4-wave vectors, $k^{2}_{2}=M_{2}^{2}$ and $k^{2}_{3}=M^{2}_{3}$. The four degrees of freedom are the amplitudes of each individual mode, i.e. $\hatε^{(+)}\left(ω_{1}\right)$, $\hatε^{(\times)}\left(ω_{1}\right)$, $\hat{B}_{2}\left(\mathbf{k}\right)$, and $\hat{B}_{3}\left(\mathbf{k}\right)$.
description: 27 pages, accepted for publication in Classical and Quantum Gravity
Hydrodynamic and scale-up studies of spouted beds
Creators: name: He, Yan-Long
Publisher: name: University of British Columbia
Year: 2009

description: The scaling relationships proposed by Glicksman (1984) for fluidized bed scale-up have been modified to provide a full set of scaling parameters for spouted bed scale-up. A force balance for particles in the annulus region leads to addition of two non-dimensional parameters, the internal friction angle (φ) and the loose packed voidage (ε₀) to the original Glicksman scaling relationships. Experimental verification of the full set of modified scaling parameters was conducted, first in a series of small spouted beds, then in larger columns up to 0.914 m in diameter, and finally in a pair of high temperature (500 °C) beds. Both viscous and inertial forces were important for the conditions investigated so that no simplifications could be made to the full set of scaling parameters. It is demonstrated that the full set of modified scaling parameters is valid for spouted beds when all dimensionless parameters are matched between the prototype and model beds. A fibre optic probe was used to measure voidage profiles in spouted beds of diameter 0.152 m. The voidage in most of the annulus was found to be somewhat higher than the loose-packed voidage and increased with increasing spouting gas flow rate, contrary to usual assumptions. The voidage decreased with height in the core of the fountain for low spouting gas flow rates, but first increased with height and then decreased towards the top of the fountain at higher gas flow rates. Radial profiles of local voidage were roughly parabolic in the lower portion of the spout and blunt in the upper portion. The same fiber optic probe was also used to measure spout diameters based on significantly higher counts of output electric pulses in the spout region than in the annulus. The flat wall of semi-cylindrical spouted bed columns was found to cause considerable distortion of spout shapes which became approximately semi-elliptical. The often-used McNab (1972) equation was found to underestimate the spout diameters in a full-column, with an average deviation of 35.5%. A second fibre optic probe system was used to measure profiles of vertical particle velocities in the spout and fountain regions. In addition, a fibre optic image probe was employed to measure particle velocity profiles in the annulus. In the spout, radial profiles of vertical particle velocities were near Gaussian in shape. Particle velocities along the spout axis in a half-column were 70% lower than in a full-column of the same diameter as the half-column under identical operating conditions. In the half column, particle velocities adjacent to the front plate were approximately 24% lower than a few millimeters away for the conditions studied. In the annulus region, there was a 28% difference between particle velocities adjacent to the column wall and those only 2 mm away. Measurements of pressure profiles and gas flow distributions in the annulus were carried out, while the influence of elevated pressures on bed hydrodynamics was also examined.
On the electronic structure of the charge-ordered phase in epitaxial and polycrystalline La1-xCaxMnO3 (x = 0.55, 0.67) perovskite manganites
Creators: name: Schmidt, Rainer
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work the charge transport properties of charge ordered (CO) La1-xCaxMnO3 (LCMO) (x= 0.55, 0.67) epitaxial thin films and polycrystals are discussed following the recent controversy of localised electron states vs. weakly or de- localised charge density wave (CDW) states in CO manganites. The transport properties were investigated by current vs. voltage, direct current resistivity vs. temperature, local activation energy vs. temperature, magnetoresistance and admittance spectroscopy measurements, which all indicated a localised electronic structure in the single CO phase. Delocalised charge anomalies observed previously may be restricted to phase separated materials.
description: Physical Review B, to be published
Η διδασκαλία των φυσικών επιστημών με τη χρήση εκπαιδευτικού λογισμικού μοντελοποίησης.
Creators: name: Σμυρναίου, Ζαχαρούλα Γ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Cet article est consacre a une expérimentation concernant le logiciel Mod elsCreator conçu pour familiariser les élèves avec les démarches de modération. Nous avons compare les descriptions et les manipulations réalisées par des élèves de collège lorsqu'ils disposent d'objets matériels pour effectuer des expériences en sciences physiques et lorsqu'ils utilisent le logiciel ModelsCreator. Les résultats montrent que l’approche relationnelle variation elle est beau- coup plus fréquente avec le logiciel qu’avec les objets. Cependant, cette approche apparait surtout lorsque préalablement a utilisation du logiciel, les élèves ont expérimente avec les objets. Le logiciel aide les élèves a conceptualiser de manière analytique les situations, et ceci des le collège, grâce a la visualisation des entités (variables), des propriétés et des relations proposée.
description: Παιδαγωγική Επιθεώρηση, Vol. 47 (2009)
Σημασιολογική Αναπαράσταση του Ελληνικού WordNet και Δημοσιοποίηση του Σύμφωνα με τις Αρχές των Διασυνδεδεμένων Δεδομένων:
Creators: name: Καραμπατάκη, Σοφία Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Διασυνδεδεμένα Δεδομένα
Γλωσσολογικά Δεδομένα
Linked Data
Linguistic Data
WordNet

description: Στις μέρες μας, το Διαδίκτυο αποτελεί ένα από τα σημαντικότερα μέσα διάδοσης γνώσης. Πληροφορίες και δεδομένα από διάφορους επιστημονικούς τομείς, και όχι μόνο, είναι διαθέσιμα σε κάθε χρήστη. Ένας τέτοιος επιστημονικός τομέας που εκπροσωπείται από ένα μεγάλο πλήθος δεδομένων στο Διαδίκτυο είναι η Γλωσσολογία, που ασχολείται με την μελέτη της ανθρώπινης γλώσσας. Ωστόσο, πολλά από αυτά τα δεδομένα είναι δημοσιευμένα σε ιδιόκτητα, κλειστά πρότυπα και δεν είναι ακόμα προσβάσιμα στο Διαδίκτυο. Αλλά, η απλή ανάρτηση μεγάλου πλήθους γλωσσολογικών δεδομένων δεν είναι επαρκής. Αν τα γλωσσολογικά δεδο-μένα συνδεθούν μεταξύ τους θα δώσουν μεγαλύτερη χρησιμότητα και αξία στις πληροφορίες που θα παρέχουν, και έτσι θα εξάγονται καλύτερα αποτελέσματα. Στην παρούσα εργασία εξετάζουμε και αναπτύσσουμε μεθόδους και πρότυπα για την σημασιολογική περιγραφή των γλωσσολογικών δεδομένων και εφαρμόζουμε τις Αρχές των Διασυνδεδεμένων Δεδομένων (LinkedData) για την δημοσιοποίηση τους στο Διαδίκτυο. Συγκεκριμένα, περιγράφουμε την δημιουργία ενός λογισμικού για την μοντελοποίηση ενός από τους μεγαλύτερους εκπροσώπους γλωσσολογικών δεδομένων στο Διαδίκτυο, του WordΝet, για την Ελληνική γλώσσα.
description: Nowadays, Web is one of the most important means of sharing knowledge. Information and data from various scientific fields, and not only, are accessible by every user. One scientific field that is represented by a large number of data on the Web is Linguistics that deals with the study of human language. However, many of these data are published in proprietary, closed formats and so there are not accessible. But, simply posting massive amounts of linguistic data is not sufficient. If linguistic data linked together will provide greater utility and value to the information provided, and thus better results will be exported. In this paper we examine and we develop methods and standards for the semantic representation of linguistic data and we apply the principles of Linked Data for their publication on the Web. Specifically, we describe the creation of a software for modeling one of the greatest representatives of linguistic data on the Internet, WordNet, for the Greek language.
K-corrections and filter transformations in the ultraviolet, optical, and near infrared
Creators: name: Blanton, Michael R.
name: Roweis, Sam
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Template fits to observed galaxy fluxes allow calculation of K-corrections and conversions among observations of galaxies at various wavelengths. We present a method for creating model-based template sets given a set of heterogeneous photometric and spectroscopic galaxy data. Our technique, non-negative matrix factorization, is akin to principle component analysis (PCA), except that it is constrained to produce nonnegative templates, it can use a basis set of models (rather than the delta function basis of PCA), and it naturally handles uncertainties, missing data, and heterogeneous data (including broad-band fluxes at various redshifts). The particular implementation we present here is suitable for ultraviolet, optical, and near-infrared observations in the redshift range 0 < z < 1.5. Since we base our templates on stellar population synthesis models, the results are intepretable in terms of approximate stellar masses and star-formation histories. We present templates fit with this method to data from GALEX, Sloan Digital Sky Survey spectroscopy and photometry, the Two-Micron All Sky Survey, the Deep Extragalactic Evolutionary Probe and the Great Observatories Origins Deep Survey. In addition, we present software for using such data to estimate K-corrections and stellar masses.
description: 43 pages, 20 figures, submitted to AJ, software and full-resolution figures available at http://cosmo.nyu.edu/blanton/kcorrect
Steering Flexural Waves by Amplitude-Shift Elastic Metasurfaces
Creators: name: Su, Guangyuan
name: Zhang, Yunhao
name: Liu, Yongquan
name: Wang, Tiejun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: As 2D materials with subwavelength structures, elastic metasurfaces show remarkable abilities to manipulate elastic waves at will through artificial boundary conditions. However, the application prospects of current metasurfaces may be restricted by their phase-only modulating boundaries. Herein, we present the next generation of elastic metasurfaces by additionally incorporating amplitude-shift modulation. A general theory for target wave fields steered by metasurfaces is proposed by modifying the Huygens-Fresnel principle. As examples, two amplitude-shift metasurfaces concerning flexural waves in thin plates are carried out: one is to transform a cylindrical wave into a Gaussian beam by elaborating both amplitude and phase shifts, and the other one is to focus the incidence by amplitude modulations only. These examples coincide well over theoretical calculations, numerical simulations and experimental tests. This work may underlie the design of metasurfaces with complete control over guided elastic waves, and may extend to more sophisticated applications, such as analog signal processing and holographic imaging.
description: 32 pages, 12 figures
Optical Conductivity of a Two-Dimensional Electron Liquid with Spin-Orbit Interaction
Creators: name: Farid, Abdel-Khalek
name: Mishchenko, Eugene
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The interplay of electron-electron interactions and spin-orbit coupling leads to a new contribution to the homogeneous optical conductivity of the electron liquid. The latter is known to be insensitive to many-body effects for a conventional electron system with parabolic dispersion. The parabolic spectrum has its origin in the Galilean invariance which is broken by spin-orbit coupling. This opens up a possibility for the optical conductivity to probe electron-electron interactions. We analyze the interplay of interactions and spin-orbit coupling and obtain optical conductivity beyond RPA.
description: 5 pages, 3 figures; final version, fig. 3 added, minor changes
R-Estimates vs. GMM: A Theoretical Case Study of Validity and Efficiency
Creators: name: Small, Dylan S.
name: Gastwirth, Joseph L.
name: Krieger, Abba M.
name: Rosenbaum, Paul R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: What role should assumptions play in inference? We present a small theoretical case study of a simple, clean case, namely the nonparametric comparison of two continuous distributions using (essentially) information about quartiles, that is, the central information displayed in a pair of boxplots. In particular, we contrast a suggestion of John Tukey--that the validity of inferences should not depend on assumptions, but assumptions have a role in efficiency--with a competing suggestion that is an aspect of Hansen's generalized method of moments--that methods should achieve maximum asymptotic efficiency with fewer assumptions. In our case study, the practical performance of these two suggestions is strikingly different. An aspect of this comparison concerns the unification or separation of the tasks of estimation assuming a model and testing the fit of that model. We also look at a method (MERT) that aims not at best performance, but rather at achieving reasonable performance across a set of plausible models.
description: Published at http://dx.doi.org/10.1214/088342305000000278 in the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Το διευθυντικό δικαίωμα του εργοδότη στη σύμβαση εξαρτημένης εργασίας - Έννοια, χαρακτηριστικά και οριοθέτηση:
Creators: name: Σαββάκης, Ιωάννης Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Εργατικό δίκαιο
Διευθυντικό δικαίωμα του εργοδότη
Έννοια
Labour law
Managerial prerogative of the employer
Notion

description: Σκοπός της συγκεκριμένης διπλωματικής εργασίας ήταν η εξέταση του διευθυντικού δικαιώματος του εργοδότη. Αρχικά επιχειρήσαμε να παρουσιάσουμε αδρομερώς όλους τους παράγοντες διαμόρφωσης των όρων εργασίας με σκοπό να εντοπιστεί η ακριβής θέση του διευθυντικού δικαιώματος στην έννομη τάξη και στη συνέχεια αποσαφηνίσαμε την έννοιά του και διερευνήσαμε το περιεχόμενο, τη θεμελίωση, τη νομική φύση, τα νομικά χαρακτηριστικά και το φορέα αυτού. Ακόμη, αναφερθήκαμε στο ζήτημα της οριοθέτησης του εργοδοτικού αυτού δικαιώματος αναδεικνύοντας τόσο τους περιορισμούς του όσο και τη δυνατότητα του εργοδότη να μεταβάλλει όρους εργασίας μέσα από συμβατικές ρήτρες. Ασχοληθήκαμε, επιπλέον, παράλληλα με τις συνέπειες που έχει η άσκηση του διευθυντικού δικαιώματος, με τις νομικές δυνατότητες που διαθέτει ο εργαζόμενος σε περιπτώσεις αντισυμβατικής και καταχρηστικής άσκησης του διευθυντικού δικαιώματος. Αρωγοί, τέλος, στην προσπάθεια που καταβλήθηκε ήταν τόσο η βιβλιογραφία, ελληνική και ξενόγλωσση, όσο και η νομολογία των ελληνικών δικαστηρίων και του Δικαστηρίου της Ευρωπαϊκής Ένωσης.
description: The aim of the present dissertation was the study of the managerial prerogative of the employer. Firstly, we tried to briefly present all the factors that modulate the conditions of employment in order to pinpoint the exact place of the managerial prerogative of the employer in the legal system, and then we examined its content, its foundation, its notion, its legal characteristics and its entity. We also investigated the issue of the demarcation of this employer's right by highlighting its restrictions, as well as the capability of the employer to modify the conditions of employment through the agreement’s clauses. Moreover, and in parallel with the consequences of the exercise of the managerial prerogative, we dealt with the legal actions that an employee can take in the case of unconventional and abusive exercise of the managerial prerogative. Lastly, the sources used in this dissertation were the Greek and foreign bibliography, as well as the case law of the Greek courts and of the Court of Justice of the European Union.
Constraining a double component dark energy model using type Ia supernovae data
Creators: name: Casarejos, Fabrício
name: Fabris, J. C.
name: Gonçalves, S. V. B.
name: da Rocha, Jaime F. Villas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A two-component fluid representing dark energy is studied. One of the components has a polytropic form, while the other has a barotropic form. Exact solutions are obtained and the cosmological parameters are constrained using supernova type Ia data. In general, an open universe is predicted. A big rip scenario is largely preferred, but the dispersion in the parameter space is very high. Hence, even if scenarios without future singularities can not be excluded with the allowed range of parameters, a phantom cosmology, with an open spatial section, is a general prediction of the model. For a wide range of the equation of state parameters there is an asymptotic de Sitter phase.
description: Latex file, 13 pages, 16 eps figures, changed content and added references
The Extreme Space Weather Event in February/March 1941
Creators: name: Hayakawa, Hisashi
name: Blake, Sean P.
name: Bhaskar, Ankush
name: Hattori, Kentaro
name: Oliveira, Denny M.
name: Ebihara, Yusuke
Publisher: name: arXiv
Year: 2020
Subjects: subject: Space Physics (physics.space-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Given the infrequency of extreme geomagnetic storms, it is significant to note the concentration of three extreme geomagnetic storms in 1941, whose intensities ranked fourth, twelfth, and fifth within the aa index between 1868-2010. Among them, the geomagnetic storm on 1 March 1941 was so intense that three of the four Dst station magnetograms went off scale. Herein, we reconstruct its time series and measure the storm intensity with an alternative Dst estimate (Dst*). The source solar eruption at 09:29 - 09:38 GMT on 28 February was located at RGO AR 13814 and its significant intensity is confirmed by large magnetic crochets of 35 nT measured at Abinger. This solar eruption most likely released a fast interplanetary coronal mass ejection with estimated speed 2260 km/s. After its impact at 03:57 - 03:59 GMT on 1 March, an extreme magnetic storm was recorded worldwide. Comparative analyses on the contemporary magnetograms show the storm peak intensity of minimum Dst* < -464 nT at 16 GMT, comparable to the most and the second most extreme magnetic storms within the standard Dst index since 1957. This storm triggered significant low-latitude aurorae in the East Asian sector and their equatorward boundary has been reconstructed as 38.5° in invariant latitude. This result agrees with British magnetograms which indicate auroral oval moving above Abinger at 53.0° in magnetic latitude. The storm amplitude was even more enhanced in equatorial stations and consequently casts caveats on their usage for measurements of the storm intensity in Dst estimates.
description: 24 pages, 5 figures
Exact Polynomial Eigensolutions of the Schrodinger Equation for the Pseudoharmonic Potential
Creators: name: Ikhdair, Sameer M.
name: Sever, Ramazan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The polynomial solution of the Schrodinger equation for the Pseudoharmonic potential is found for any arbitrary angular momentum $l$. The exact bound-state energy eigenvalues and the corresponding eigen functions are analytically calculated. The energy states for several diatomic molecular systems are calculated numerically for various principal and angular quantum numbers. By a proper transformation, this problem is also solved very simply by using the known eigensolutions of anharmonic oscillator potential.
description: 10 pages
Ο ρόλος του παιχνιδιού στη μαθηματική εκπαίδευση: ανταγωνιστικές στάσεις και ψευδαίσθηση ομοθυμίας.
Creators: name: Σκουμπουρδή, Χρυσάνθη
name: Καλαβάσης, Φραγκίσκος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: In this article are presented students’, teachers’ and parents’ opinions for the value of games in mathematics education aiming to show forth their dif¬ferent representations for the same subject.
The collected data were related with students’ teachers’ and parents’ aware¬ness about the games in house and school respectively while at the same time their opinions (teachers’ and parents’) for the role of games generally and specifically in cognitive, in sentimental as well as in the social sector were recorded.
From the analysis of answers it appeared that students’, teachers’ and par¬ents’ reports on the types of games, had resemblances and differences. The main differentiation was located on the opinions of teachers (of parents) about parents’ beliefs (teacher’s beliefs) for the value of games in mathematics education.
description: Παιδαγωγική Επιθεώρηση, Vol. 47 (2009)