cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tracing the total molecular gas in galaxies: [CII] and the CO-dark gas
Creators: name: Madden, S. C.
name: Cormier, D.
name: Hony, S.
name: Lebouteiller, V.
name: Abel, N.
name: Galametz, M.
name: De Looze, I.
name: Chevance, M.
name: Polles, F. L.
name: Lee, M. -Y.
name: Galliano, F.
name: Lambert-Huyghe, A.
name: Hu, D.
name: Ramambason, L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: While the CO(1-0) transition is often used to deduce the total molecular hydrogen in galaxies, it is challenging to detect in low metallicity galaxies, in spite of the star formation taking place. In contrast, the [CII] 158 micron line is relatively bright, highlighting a potentially important reservoir of H2 that is not traced by CO(1-0), but residing in the C+ - emitting regions. We explore a method to quantify the total H2 mass (MH2) in galaxies and learn what parameters control the CO-dark gas reservoir. We present Cloudy grids of density, radiation field and metallicity in terms of observed quantities, such as [OI], [CI], CO(1-0), [CII], total infrared luminosity and the total MH2 and provide recipes based on these models to derive total MH2 mass estimates from observations. The models are applied to the Herschel Dwarf Galaxy Survey, extracting the total MH2 for each galaxy which is compared to the H2 determined from the observed CO(1-0) line. While the H2 traced by CO(1-0) can be negligible, the [CII] 158 micron line can trace the total H2. 70% to 100% of the total H2 mass is not traced by CO(1-0) in the dwarf galaxies, but is well-traced by [CII] 158 micron line. The CO-dark gas mass fraction correlates with the observed L[CII]/LCO(1-0) ratio. A conversion factor for [CII] luminosity to total H2 and a new CO-to-total-MH2 conversion factor, as a function of metallicity, is presented. A recipe is provided to quantify the total mass of H2 in galaxies, taking into account the CO and [CII] observations. Accounting for this CO-dark H2 gas, we find that the star forming dwarf galaxies now fall on the Schmidt-Kennicutt relation. Their star-forming efficiency is rather normal, since the reservoir from which they form stars is now more massive when introducing the [CII] measures of the total H2, compared to the little amount of H2 in the CO-emitting region.
description: Accepted for publication in A&A
Time Evolution of the Neel State
Creators: name: Soluyanov, Alexey A.
name: Zagoulaev, Serge N.
name: Abarenkov, Igor V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A quasionedimentional spin chain (s=1/2) is considered as a lattice consisting of two sublattices. The attention is paid to the states which are pure spin states of the whole lattice and both sublattices, the value of the sublattices' spins being maximum. It is shown that the Neel state can be considered as a superposition of such states. The exact equation for this superposition coefficients is developed. The possibility of the Neel state to be the eigenstate of a Hamiltonian is discussed. Several model Hamiltonians are examined, the well known ones and few novel Hamiltonians being considered. The time evolution of the Neel state in different models is studied with the help of Fock-Krylov method.
description: 10 pages, 5 figures. Submitted to IJQC. Typos corrected. Some results added
Computational Analysis of Atomic Trajectories in Domains of Protein Causing Lung Cancer
Creators: name: Qureshi, Rizwan
name: Yan, Hong
Publisher: name: F1000 Research Limited
Year: 2019

description: Non-small cell Lung Cancer (NSCLC) is a major cause of death worldwide. About (80 - 85)% of lung cancer cases are NSCLC. It is well known that mutation of epidermal growth factor (EGFR, cancer related protein) may lead to NSCLC. In this work, we perform MD simulation for wildtype EGFR, EGFR with L858R mutation and EGFR with L858R and T790M mutation. We, then consider atom trajectories of EGFR and its mutant sequences as non-stationary time signals and autoregressive integrated (ARI) model is applied to these signals. The Power spectral density for each type is calculated. To analyze further, we divide complete structure of EGFR and its mutant sequences into 8 domains based on prior experimental knowledge. Dynamic time warping is used to analyze the similarity between each domain of the structures. The simulation results give useful insight about conformations dynamics of EGFR, such as the mutation causes the motion of atoms to be distorted and the protein become destabilized. The domains are less correlated in L858R type and even weaker when the second mutations occur. Overall, these ﬁndings will be helpful in computer aided drug discovery for NSCLC treatment
$b\to sτ^+τ^-$ Physics at Future $Z$ Factories
Creators: name: Li, Lingfeng
name: Liu, Tao
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: $b\to sτ^+τ^-$ measurements are highly motivated for addressing lepton-flavor-universality (LFU)-violating puzzles such as $R_{K^{(\ast)}}$ anomalies. The anomalies of $R_{D^{(*)}}$ and $R_{J/ψ}$ further strengthen their necessity and importance, given that the LFU-violating hints from both involve the third-generation leptons directly. $Z$ factories at the future $e^-e^+$ colliders stand at a great position to conduct such measurements because of their relatively high production rates and reconstruction efficiencies for $B$ mesons at the $Z$ pole. To fully explore this potential, we pursue a dedicated sensitivity study in four $b\to sτ^+τ^-$ benchmark channels, namely $B^0\to K^{\ast 0} τ^+ τ^-$, $B_s\toϕτ^+ τ^-$, $B^+ \to K^+ τ^+ τ^- $ and $B_s \to τ^+ τ^-$, at the future $Z$ factories. We develop a fully tracker-based scheme for reconstructing the signal $B$ mesons and introduce a semi-quantitative method for estimating their major backgrounds. The simulations indicate that branching ratios of the first three channels can be measured with a precision $\sim \mathcal O(10^{-7} - 10^{-6})$ and that of $B_s \to τ^+ τ^-$ with a precision $\sim \mathcal O(10^{-5})$ at Tera-$Z$. The impacts of luminosity and tracker resolution on the expected sensitivities are explored. The interpretations of these results in effective field theory are also presented.
description: 31 pages, 10 figures, comments welcome
Διαμόρφωση πολιτικής για την ειδική εκπαίδευση στην Κύπρο: διαπιστώσεις και προεκτάσεις
Creators: name: Συμεωνίδου, Σ.
name: Φτιάκα, Ελένη
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 33 (2002)
Higher-Order Spin-Hole Correlations around a Localized Charge Impurity
Creators: name: Wang, Yao
name: Bohrdt, Annabelle
name: Koepsell, Joannis
name: Demler, Eugene
name: Grusdt, Fabian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Analysis of higher-order correlation functions has become a powerful tool for investigating interacting many-body systems in quantum simulators, such as quantum gas microscopes. Experimental measurements of mixed spin-charge correlation functions in the 2D Hubbard have been used to study equilibrium properties of magnetic polarons and to identify coherent and incoherent regimes of their dynamics. In this paper we consider theoretically an extension of this technique to systems which use a pinning potential to reduce the mobility of a single dopant in the Mott insulating regime of the 2D Hubbard model. We find that localization of the dopant has a dramatic effect on its magnetic dressing. The connected third-order spin correlations are weakened in the case of a mobile hole but strengthened near an immobile hole. In the case of the fifth-order correlation function, we find that its bare value has opposite signs in cases of the mobile and of fully pinned dopant, whereas the connected part is similar for both cases. We study suppression of higher-order correlators by thermal fluctuations and demonstrate that they can be observed up to temperatures comparable to the spin-exchange energy $J$. We discuss implications of our results for understanding the interplay of spin and charge in doped Mott insulators.
description: 12 pages, 8 figures
Performance study of the IEEE 802.11 wireless media access control protocols
Creators: name: Cheung, William K. W.
Publisher: name: University of British Columbia
Year: 2009

description: The performance of the IEEE Project 802.11 Wireless Media Access Control (WMAC) protocols for wireless local area networks (WLANs) is studied. In particular, the asynchronous data service in the contention period of the protocol is simulated in both adhoc and infrastructure network topologies. Ptolemy, a powerful mixed-mode and object-oriented simulator, is used as the engine for all discrete-event computer simulations. The sensitivity of network geometry, traffic flow, queueing size, channel models, hardware, and backoff parameters on performance is extensively studied. Moreover, the "hidden terminal problem" is also examined. It turns out that the connectivity and the hidden terminal parameter, P[sub h], can be used to predict the performance of the system with different geometries. In the worst case considered in this thesis where both the connectivity and P[sub h] are high, the throughput performance for the Carrier Sensing Multiple Access with Collision Avoidance (CSMA/CA) protocol using RTS/CTS and ACK frames drops down to 16% of the data rate. However, the throughput is kept steady even when the system load is twice the data rate. Various other parameters used in the simulation can also affect the performance to some extent. Near optimal values for the queueing size, the receiver sensitivity, the carrier sense threshold, the contention window size, and the maximum retransmission value can be found through computer simulations. On the whole, it appears that the performance of the CSMA/CA basic access protocol in the 802.11 standard is acceptable even under adverse channel conditions.
Χιούμορ και οργανωσιακή συμπεριφορά: πώς ο αυτοσαρκασμός του ηγέτη επηρεάζει τους υφισταμένους του στον οργανισμό
Creators: name: Μαργαρίτης, Χρήστος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: αυτοσαρκασμός
εμπιστοσύνη
εργασιακή φωνή
self-deprecation
trust
prosocial voice

description: Η παρούσα εργασία, μελετά το φαινόμενο της χρήσης ενός συγκεκριμένου είδους χιούμορ από τον ηγέτη σε έναν οργανισμό, του αυτοσαρκασμού και τι επίδραση έχει αυτό στους υφισταμένους του. Ειδικότερα, εξετάζεται η συσχέτιση του αυτοσαρκα-σμού του ηγέτη, με την εμπιστοσύνη που δείχνουν οι υφιστάμενοι στο πρόσωπό του και ο μεσολαβητικός ρόλος αυτής, μεταξύ του αυτοσαρκασμού και της εργασιακή φωνής που αναπτύσσουν. Πρώτα, έγινε ανασκόπηση της βιβλιογραφίας που αναφέ-ρεται είτε ξεχωριστά, είτε συσχετίζοντάς κάποιους απ’ τους τρεις παραπάνω παράγο-ντες, που συμπεριελήφθησαν στο μοντέλο. Στη συνέχεια αναλύονται τα αποτελέσματα της έρευνας που διενεργήθηκε με τη συμμετοχή 151 εργαζομένων οι οποίοι συ-μπλήρωσαν ηλεκτρονικά τα ερωτηματολόγια που τους διανεμήθηκαν. Σύμφωνα με τα αποτελέσματα αυτά, ο αυτοσαρκασμός του ηγέτη, σχετίζεται θετικά με την εμπιστο-σύνη που δείχνουν οι υφιστάμενοι στο πρόσωπό του, η εμπιστοσύνη τους αυτή, σχε-τίζεται με τη σειρά της επίσης θετικά με την εργασιακή φωνή που αναπτύσσουν, και τέλος, θετική είναι και η σχέση ανάμεσα στον αυτοσαρκασμό και την εργασιακή φω-νή, όταν η εμπιστοσύνη, παίρνει το ρόλο του μεσολαβητή στο προς εξέταση μοντέλο. Στη συνέχεια επισημαίνονται κάποιες πρακτικές προτάσεις προς τα διοικητικά στελέχη για την ενίσχυση αυτού του φαινομένου, οι περιορισμοί της έρευνας, αλλά και μερικές προτάσεις για μελλοντική έρευνα.
description: This thesis examines the phenomenon of a leader in an organization using a specific type of Humour, calling self-deprecation and the impacts it has to his subordinates. Specifically, the study examines the correlation between leader’s self-deprecation and the trust his subordinates show him and the mediating role of this trust between the leader’s self-deprecation and the subordinate’s prosocial voice. At first, the study be-gins with the literature review of the three factors that are mentioned above, either each one alone, or either with some of them being correlated together. Then, it ana-lyzes the results of the empirical research conducted with 151 employees, who filled the electronic questionnaires that were given to them. According to these results, leader’s self-deprecation., correlates positively with the trust the subordinates show to him. This trust also correlates positively with the prosocial voice the employees de-velop and finally, the correlation between the self-deprecation and the prosocial voice is also positive, when trust takes its place as a mediator in the examined model. Then, the study provides some practical implications for managers of organizations, in order to boost this phenomenon, as well as the study’s limitations and some suggestions of future research.
Field-driven phase transitions in a quasi-two-dimensional quantum antiferromagnet
Creators: name: Stone, M. B.
name: Broholm, C.
name: Reich, D. H.
name: Schiffer, P.
name: Tchernyshyov, O.
name: Vorderwisch, P.
name: Harrison, N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report magnetic susceptibility, specific heat, and neutron scattering measurements as a function of applied magnetic field and temperature to characterize the $S=1/2$ quasi-two-dimensional frustrated magnet piperazinium hexachlorodicuprate (PHCC). The experiments reveal four distinct phases. At low temperatures and fields the material forms a quantum paramagnet with a 1 meV singlet triplet gap and a magnon bandwidth of 1.7 meV. The singlet state involves multiple spin pairs some of which have negative ground state bond energies. Increasing the field at low temperatures induces three dimensional long range antiferromagnetic order at 7.5 Tesla through a continuous phase transition that can be described as magnon Bose-Einstein condensation. The phase transition to a fully polarized ferromagnetic state occurs at 37 Tesla. The ordered antiferromagnetic phase is surrounded by a renormalized classical regime. The crossover to this phase from the quantum paramagnet is marked by a distinct anomaly in the magnetic susceptibility which coincides with closure of the finite temperature singlet-triplet pseudo gap. The phase boundary between the quantum paramagnet and the Bose-Einstein condensate features a finite temperature minimum at $T=0.2$ K, which may be associated with coupling to nuclear spin or lattice degrees of freedom close to quantum criticality.
description: Submitted to New Journal of Physics
Photometric Stellar Variability in the Galactic Center
Creators: name: Rafelski, M.
name: Ghez, A. M.
name: Hornstein, S. D.
name: Lu, J. R.
name: Morris, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the results of a diffraction-limited, photometric variability study of the central 5"x5" of the Galaxy conducted over the past 10 years using speckle imaging techniques on the W. M. Keck I 10 m telescope. Within our limiting magnitude of mK < 16 mag for images made from a single night of data, we find a minimum of 15 K[2.2 micron]-band variable stars out of 131 monitored stars. The only periodic source in our sample is the previously identified variable IRS 16SW, for which we measure an orbital period of 19.448 +- 0.002 days. In contrast to recent results, our data on IRS 16SW show an asymmetric phased light curve with a much steeper fall-time than rise-time, which may be due to tidal deformations caused by the proximity of the stars in their orbits. We also identify a possible wind colliding binary (IRS 29N) based on its photometric variation over a few year time-scale which is likely due to episodic dust production. None of the 4 LBV candidates in our sample show the characteristic large increase or decrease in luminosity, however, our time baseline is too short to rule them out as LBVs. Among the remaining variable stars, the majority are early-type stars and three are possibly variable due to line of sight extinction variations. For the 7 OB stars at the center of our field of view that have well-determined 3-dimensional orbits, we see no evidence of flares or dimming of their light, which limits the possibility of a cold, geometrically-thin inactive accretion disk around the supermassive black hole, Sgr A*.
description: Accepted for publication in ApJ (to appear in 10 Apr 2007, vol. 659 issue), 18 pages and 15 figures
Αυτο-ρύθμιση κατά την κατανόηση κειμένων: θεωρητική θεμελίωση και πειραματική εφαρμογή του μοντέλου της αμοιβαίας διδασκαλίας
Creators: name: Κουλουμπαρίτση, Αλεξάνδρα
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 33 (2002)
The Three-Box Paradox Revisited
Creators: name: Ravon, Tamar
name: Vaidman, Lev
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The classical three-box paradox of Kirkpatrick [J. Phys. A 36 4891 (2003)] is compared to the original quantum Three-Box paradox of Aharonov and Vaidman [J. Phys. A 24 2315 (1991)]. It is argued that the quantum Three-Box experiment is a "quantum paradox" in the sense that it is an example of a classical task which cannot be accomplished using classical means, but can be accomplished using quantum devices. It is shown that Kirkpatrick's card game is analogous to a different game with a particle in three boxes which does not contain paradoxical features.
description: 13 pages, 4 figures
Infrared Renormalization Group Flow for Heavy Quark Masses
Creators: name: Hoang, Andre H.
name: Jain, Ambar
name: Scimemi, Ignazio
name: Stewart, Iain W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A short-distance heavy quark mass depends on two parameters, the renormalization scale mu controlling the absorption of ultraviolet fluctuations into the mass, and a scale R controlling the absorption of infrared fluctuations. 1/R can be thought of as the radius for perturbative corrections that build up the mass beyond its point-like definition in the pole scheme. Treating R as a variable gives a renormalization group equation. We argue that the sign of this anomalous dimension is universal: increasing R to add IR modes decreases m(R). The flow improves the stability of conversions between mass schemes, allowing us to avoid large logs and the renormalon. The flow in R can be used to study IR renormalons without using bubble chains, and we use it to determine the coefficient of the LambdaQCD renormalon ambiguity of the pole mass with a convergent sum-rule.
description: 4 pages, 2 figures, Added explicit result for the top MSbar mass with uncertainties
Ελλείματα στη διοίκηση του δημοτικού σχολείου στην Κύπρο
Creators: name: Θεοφιλίδης, Χρήστος
name: Στυλιανίδης, Μάριος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 33 (2002)
Η προστασία των δεδομένων προσωπικού χαρακτήρα στην Κοινωνική Ασφάλιση
Creators: name: Μενεγάκη, Ειρήνη Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Προστασία
Δεδομένα προσωπικού χαρακτήρα
Κοινωνική Ασφάλιση
Protection
Personal data
Social Insurance

description: Στόχος της παρούσας διπλωματικής εργασίας είναι η συνεκτική παρουσίαση του τρόπου και των μηχανισμών προστασίας των ασφαλισμένων και των συνταξιούχων από μη σύννομες επεξεργασίες των προσωπικών δεδομένων τους με ιδιαίτερη έμφαση στα δεδομένα που αφορούν την κοινωνική πρόνοια στο χώρο της Κοινωνικής Ασφάλισης. Όπως θα δούμε αναλυτικά, τα ασφαλιστικά και συνταξιοδοτικά ταμεία και οι λοιποί φορείς, ως υπεύθυνοι επεξεργασίας προσωπικών δεδομένων των ασφαλισμένων και συνταξιούχων δεν ασκούν απρόσκοπτα και ανεξέλεγκτα τις αρμοδιότητές τους, αλλά είναι υποχρεωμένοι για τη σύννομη τήρηση αρχείου προσωπικών δεδομένων και την επεξεργασία αυτών, καθώς επίσης οφείλουν να τηρούν και τις προβλεπόμενες βασικές αρχές επεξεργασίας, να σέβονται τα θεσπισμένα δικαιώματα των ασφαλισμένων και των συνταξιούχων ως υποκείμενων της επεξεργασίας, να ζητούν τη συγκατάθεση τους στις περιπτώσεις που απαιτείται η χορήγησή της και τέλος να συνεργάζονται με την Αρχή προστασίας προσωπικών δεδομένων και να υφίστανται τον έλεγχο της προς την κατεύθυνση της πιο αποτελεσματικής προστασίας των προσωπικών δεδομένων των υποκειμένων. Τέλος, προς την πληρέστερη ασφάλεια των προσωπικών δεδομένων των υποκειμένων προβλέπεται από την ελληνική νομοθεσία, πέρα από το προληπτικό σύστημα και κατασταλτικό σύστημα ελέγχου της επεξεργασίας των προσωπικών δεδομένων, καθώς και αντίστοιχες κυρώσεις, η βαρύτητα των οποίων ποικίλει ανάλογα προς την επικινδυνότητα της επεξεργασίας για την ασφάλεια των προσωπικών δεδομένων των υποκειμένων.
description: The aim of the present thesis is the consistent presentation of the way and mechanisms of the protection of policyholders and pensioners from unlawful processing of their personal data with particular emphasis on the data relating to social welfare in the field of Social Security. As we will examine in detail, insurance and pension funds as well as other institutions which are responsible for the control of personal data of policyholders and pensioners do not exert their powers smoothly and without control, but they are obliged to comply with the lawful personal data file and processing, as well as they must adhere to the statutory basic processing principles, respect the statutory rights of the insured and retired as the subjects of processing, seek for their consent where required and finally they must cooperate with the Authority of Protection of Personal Data and undergo its control towards the direction of a more effective protection of the subjects’ personal data. To sum up, beyond the foresaid preventive system for the protection of personal data, the Greek Law also provides a repressive control system for their complete protection as well as the imposition of corresponding sanctions, the severity of which varies according to the extend and the risk that involves the particular processing of personal data of the subjects.
Spatial chromatin architecture alteration by structural variations in human genomes at the population scale
Creators: name: Sadowski, Michal
name: Kraft, Agnieszka
name: Przemysław Szałaj
name: Wlasnowolski, Michal
name: Zhonghui Tang
name: Yijun Ruan
name: Plewczynski, Dariusz
Publisher: name: F1000 Research Limited
Year: 2019

description: Background: The number of reported examples of chromatin architecture alterations involved in regulation of gene transcription and in disease is increasing. However, no genome-wide testing was performed to asses the abundance of these events and their importance relative to other factors affecting genome regulation. This genome-wide study attempts to fill this lack by analyzing the impact of genetic variants identified in individuals from 26 human populations and in genome-wide association studies onto chromatin spatial organization.
Results: We assess the tendency of structural variants to accumulate in spatially interacting genomic segments and design a high-resolution computational algorithm to model chromatin conformational changes caused by structural variations. We show that differential gene transcription is closely linked to variation in chromatin interaction networks mediated by RNA polymerase II. We also demonstrate that CTCF-mediated interactions are well conserved across population, but enriched with disease-associated SNPs. Moreover, we find boundaries of topological domains as relatively frequent target of duplications, which suggests that these duplications can be an important evolutionary mechanism of genome spatial organization.
Conclusions: Altogether, this study assesses the critical impact of genetic variants on the higher-order organization of chromatin folding and provides unique insight into the mechanisms regulating transcription at the population scale.
The relation between AGN type and host galaxy properties
Creators: name: Masoura, V. A.
name: Mountrichas, G.
name: Georgantopoulos, I.
name: Plionis, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use 3,213 Active Galactic Nuclei (AGNs) from the $\it{XMM}$-XXL northern field to investigate the relation of AGN type with host galaxy properties. Applying a Bayesian method, we derive the hardness ratios (HRs) and through these the hydrogen column density ($\rm N_H$) for each source. We consider as absorbed sources (type-2) those with $\rm N_H > 10^{21.5}\, \rm{cm^{-2}}$. We examine the star formation rate (SFR) as well the stellar mass (M$_*$) distributions for both absorbed and unabsorbed sources. Our work indicates that there is no significant link between the AGN type and these host galaxy properties. Next, we investigate whether the AGN power, as represented by its X-ray luminosity, $\rm L_X$, correlates with any deviation of the host galaxy's place from the so-called Main Sequence of galaxies, and we examine this separately for the obscured and the unobscured AGN populations. To take into account the effect of M$_*$ and redshift on SFR, we use the normalised SFR (SFR$_{norm}$). We find that the correlation between $\rm L_X$ and SFR$_{norm}$, follows approximately the same trend for both absorbed and unabsorbed sources, a result that favours the standard AGN unification models. Finally, we explore the connection between the obscuration, $\rm N_H$, and the SFR. We find that there is no relation between these, suggesting that the obscuration is not related to the large scale SFR in the galaxy.
description: A&A accepted, 11 pages, 12 Figures
Construction of optimal multi-level supersaturated designs
Creators: name: Xu, Hongquan
name: Wu, C. F. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62K15 (Primary) 62K05, 05B15 (Secondary)

description: A supersaturated design is a design whose run size is not large enough for estimating all the main effects. The goodness of multi-level supersaturated designs can be judged by the generalized minimum aberration criterion proposed by Xu and Wu [Ann. Statist. 29 (2001) 1066--1077]. A new lower bound is derived and general construction methods are proposed for multi-level supersaturated designs. Inspired by the Addelman--Kempthorne construction of orthogonal arrays, several classes of optimal multi-level supersaturated designs are given in explicit form: Columns are labeled with linear or quadratic polynomials and rows are points over a finite field. Additive characters are used to study the properties of resulting designs. Some small optimal supersaturated designs of 3, 4 and 5 levels are listed with their properties.
description: Published at http://dx.doi.org/10.1214/009053605000000688 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Σχολική αποτυχία: αιτιακή απόδοση και συμπεριφορά
Creators: name: Γεωργίου, Στέλιος Ν.
name: Σταυρινίδης, Παν.
name: Παναούρα, Γ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Attribution theory, or we study or perceived causation, claims that the way in which one explains a certain outcome influences his or her attitudes and behavior towards the affected person. This study aimed to examine the relationship between teacher attributions of student failure and the treatment of low achieving students in class. Teachers in an educational district of Cyprus received a questionnaire asking them to identify a failing student in their class, explain the reason for this failure by attributing it differentially to several causes and finally to describe their own behavior towards the student. The teachers who responded (N=275) showed a «self-.serving bias>>by attributing student failure to almost everybody else (parents, students, educational system) but to themselves. The more these teachers attributed failure to the student's low ability (as opposed to low effort), the more they tended to feel pity for him or her and to give up trying to help. Attributions of failure to the student's low ability and to his or her family were highly related to the teacher's rejecting behavior towards the student in class. The teachers personal explanation of a particular student's low performance affects the formers attitude and behavior towards the latter and interferes negatively with the teaching and learning process.
description: Παιδαγωγική Επιθεώρηση, Vol. 33 (2002)
Από τη Θράκη στη Μακεδονία: η αναβίωση του εμπορικού δικτύου της οθωμανικής αυτοκρατορίας μέσα από τα μνημεία της Βόρειας Ελλάδας
Creators: name: Δόλογλου, Αναστασία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Οθωμανικό εμπόριο
Μνημεία Βόρειας Ελλάδας
Ottoman Trade
North Greece monuments

description: Αντικείμενο της παρούσας εργασίας είναι η μελέτη του εμπορικού και οικονομικού δικτύου της Οθωμανικής Αυτοκρατορίας στη Βόρεια Ελλάδα, ιδωμένου μέσα από τα αρχιτεκτονικά μνημεία της εποχής που κατάφεραν να φτάσουν ως τις μέρες μας, με στόχο την σύνταξη ενός σχεδίου δράσης για την διάσωση, αποκατάσταση και ανάδειξή του ως πολιτιστικό δίκτυο. Γίνεται αναφορά στο ιστορικό και κοινωνικό-οικονομικό πλαίσιο της οθωμανικής εποχής και στα στοιχεία που συνθέτουν τον χαρακτήρα ενός χερσαίου εμπορικού δικτύου της εποχής. Παρουσιάζονται τα σημαντικότερα αστικά κέντρα του δικτύου με παράλληλη καταγραφή των οθωμανικών μνημείων που σχετίζονται με το εμπόριο και την οικονομία. Ακολουθεί σχολιασμός της κατάστασης διατήρησης των μνημείων και της αλλοίωσης που έχει επέλθει στο περιβάλλον τους. Τέλος προτείνεται ένα σχέδιο για την διάσωση, προστασία και ανάδειξη του συνόλου του οθωμανικού εμπορικού δικτύου ως δίκτυο πολιτιστικών διαδρομών, ενώ παράλληλα προτείνεται ο σχεδιασμός μίας διαδικτυακής ψηφιακής πλατφόρμας για την διαχείριση του πολιτιστικού δικτύου
description: The purpose of this study is to examine the commercial and economic network of the Ottoman Empire in North Greece, seen through the architectural monuments of the era that made it to the present day, with the aim of designing an action plan for its preservation, restoration and enhancement as a cultural network. Reference is made to the historical and socio-economic context of the Ottoman era and the elements that constitute the character of an inland ottoman commercial network. The major urban centers of the network are presented along with the preserved Ottoman monuments, which are related to trade and economy activities. The preservation status of the monuments and the distortion of the historical environment is, also, taken into account. Finally, there is a proposal for a management plan for the rescue, protection and promotion of the entire Ottoman trade network as a cultural network, part of which consists an online web platform.
Real-time performance monitoring and fault diagnosis of hydraulic manipulators
Creators: name: Sun, Xiaodan
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis, a revised hydraulic model of a heavy-duty Caterpillar 215B excavator is presented. The functional module based dynamic and hydraulic simulator is rewritten in C and tested. The simulator, which is the fundamental part of the model-based fault diagnostic algorithm for real-time performance monitoring and fault diagnosis, is validated by means of using real system data., Fault diagnosis algorithms are reviewed in both the control and artificial intelligence communities. Based on the analysis of the system's working mechanism, system structure and behavior, a model-based Incremental Fault Diagnostic Algorithm — IFDA is presented which has the capability of multiple fault detection for both sensor and component faults. The IFDA's task is to monitor and diagnose active machine component faults, sensor faults or other electronics faults. Another diagnostic algorithm for the idle machine is proposed to detect electronics failures based on the contribution of hydraulic component deadband behavior. The monitoring and diagnostic system structure and software/hardware configuration are proposed, and the main scheme has been implemented. Experimental data on steady state single fault and multiple fault tests have demonstrated the algorithm.
Electronic energy gap closure and metal-insulator transition in dense liquid hydrogen
Creators: name: Gorelov, Vitaly
name: Ceperley, David M.
name: Holzmann, Markus
name: Pierleoni, Carlo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Using Quantum Monte Carlo (QMC) calculations, we investigate the insulator-metal transition observed in liquid hydrogen at high pressure. Below the critical temperature of the transition from the molecular to the atomic liquid, the fundamental electronic gap closure occurs abruptly, with a small discontinuity reflecting the weak first-order transition in the thermodynamic equation of state. Above the critical temperature, molecular dissociation sets in while the gap is still open. When the gap closes, the decay of the off-diagonal reduced density matrix shows that the liquid enters a gapless, but localized phase: there is a cross-over between the insulating and the metallic liquids. Compared to different DFT functionals, our QMC calculations provide larger values for the fundamental gap and the electronic density of states close to the band edges, indicating that optical properties from DFT potentially benefit from error cancellations.
Effects of short-range interactions on transport through quantum point contacts: A numerical approach
Creators: name: Lassl, Andreas
name: Schlagheck, Peter
name: Richter, Klaus
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study electronic transport through a quantum point contact, where the interaction between the electrons is approximated by a contact potential. Our numerical approach is based on the non-equilibrium Green function technique which is evaluated at Hartree-Fock level. We show that this approach allows us to reproduce relevant features of the so-called "0.7 anomaly" observed in the conductance at low temperatures, including the characteristic features in recent shot noise measurements. This is consistent with a spin-splitting interpretation of the process, and indicates that the "0.7 anomaly" should also be observable in transport experiments with ultracold fermionic atoms.
description: 12 pages, 10 figures
Αντιλήψεις διευθυντών σχολικών μονάδων Ν. Αχαϊας για το ρόλο του σύγχρονου διευθυντή στη σχολική κοινότητα. Μια ποσοτική έρευνα
Creators: name: Αγγελόπουλος, Η.
name: Καραγιάννης, Π.
name: Φωκάς, Ε.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Nowadays a series of important questions are put forward regarding the contribution of primary school to the formation of a modem global educational system. School is an organization, which can have different orientations and perspectives. In our research (which was done through a questionnaire administered to headmasters of our region) the head teachers were asked to express their opinions about the characteristics of the school that they consider as most important and the ones that they consider as leas; important. We used these interviews in our qualitative analysis in order to test the results of our quantitative survey and we have come up with the following findings: 1. The head-teachers seem to have a rather confused notion of the objectives and the function of the school. 2. They place great importance to the interpersonal relationships of the teachers who work in their school. 3. They are interested in having a creative communication with the Ministry of Education. 4. They don't seem to be interested in establishing connections between their school and the local community.
description: Παιδαγωγική Επιθεώρηση, Vol. 33 (2002)
Circular polarization in radio pulsar PSR B1451-68: coherent mode transitions and intrabeam interference
Creators: name: Dyks, J.
name: Weltevrede, P.
name: Ilie, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The radio emission of pulsar B1451-68 contains two polarization modes of similar strength, which produce two clear orthogonal polarization angle tracks. When viewed on a Poincare sphere, the emission is composed of two flux patches that rotate meridionally as function of pulse longitude and pass through the Stokes V poles, which results in transitions between orthogonal polarization modes (OPMs). Moreover, the ratio of power in the patches is inversed once within the profile window. It is shown that the meridional circularization is caused by a coherent OPM transition (COMT) produced by a varying mode ratio at a fixed quarter-wave phase lag. The COMTs may be ubiquitous and difficult to detect in radio pulsar data, because they can leave no trace in polarized fractions and they are described by equation similar to the rotating vector model. The circularization, which coincides with flux minima at lower frequency, requires that profile components are formed by radiation with an oscillation phase which increases with longitude in steps of 90 degrees per component. The properties can be understood as an interference pattern involving two pairs of linear orthogonal modes (or two nonorthogonal elliptic waves). The frequency-dependent coherent superposition of coplanar oscillations can produce the minima in the pulse profile, and thereby the illusion of components as separate entities. The orthogonally polarized signal which is left after such negative interference explains the enhancement of polarization degree which is commonly observed in the minima between profile components.
description: 20 pages, 17 figures, accepted by MNRAS
Wormholes with varying equation of state parameter
Creators: name: Rahaman, F.
name: Kalam, M.
name: Chakraborty, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We propose wormholes solutions by assuming space dependent equation of state parameter. Our models show that the existence of wormholes is supported by arbitrary small quantities of averaged null energy condition (ANEC) violating phantom energy characterized by variable equation state parameter.
description: A new section has been added and 2 figures are included
Η ανταγωνιστικότητα των ελληνικών μήλων στην αγορά της Γερμανίας
Creators: name: Τσάτσου, Καλλιόπη Στέργιος
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ανταγωνιστικότητα
Ελληνικά μήλα
Αγορά Γερμανίας
Competitiveness
Greek apples
Market of Germany

description: Η παρούσα εργασία μελετάει την ανταγωνιστικότητα των ελληνικών μήλων σε σχέση με Ιταλία, την Γαλλία και την Ολλανδία στην αγορά της Γερμανίας. Η επιλογή των ανταγωνιστριών χωρών έγινε με κριτήριο την μεγαλύτερη εξαγωγική δραστηριότητα σε μήλα που εμφανίζουν οι χώρες αυτές παγκόσμια, από το γεγονός ότι είναι μέλη της Ευρωπαϊκής Ένωσης αλλά και με κριτήριο τον προσανατολισμό του κύριου όγκου των εξαγωγών μήλων των χωρών αυτών την εξεταζόμενη περίοδο 2000-2011. Η επιλογή της αγοράς έγινε με κριτήριο την προοπτική που έχουν ή δύναται να αποκτήσουν οι ελληνικές εξαγωγές μήλων. Η αγορά της Γερμανίας απορρόφα τον μεγαλύτερο όγκο μήλων ανάμεσα στις χώρες της Ευρωπαϊκής Ένωσης, αποτελεί τον 2ο μεγαλύτερο εισαγωγέα μήλων παγκοσμίως αλλά και το μεγαλύτερο μέρος των εξαγωγών μήλων μέσα στην Ευρώπη, της Ελλάδας, της Ιταλίας, της Γαλλίας και της Ολλανδίας κατευθύνεται προς την αγορά της Γερμανίας. Για την ανάλυση της ανταγωνιστικότητας της Ελλάδας και των ανταγωνιστριών χωρών εκτιμήθηκαν οι παρακάτω δείκτες: α) ο δείκτης Grubel-Lloyd, β) το μερίδιο αγοράς, γ) ο δείκτης ανταγωνιστικότητας-εξειδίκευσης, δ) ο δείκτης αποκαλυπτόμενου ανταγωνιστικού πλεονεκτήματος, ε) ο δείκτης ειδίκευσης, ζ) ο δείκτης εμπορικής έντασης. Η αγορά της Γερμανίας είναι κύριος εξαγωγικός προορισμός των ελληνικών μήλων στην Ευρώπη των 27. Στην εργασία παρουσιάζονται ακόμα στοιχεία που αφορούν την ιστορική καταγωγή των μήλων και την βοτανική ταξινόμηση, την αγροτική πολιτική γενικότερα και ειδικότερα για τα μήλα, την παραγωγή και το εμπόριο των μήλων.
description: This search studies the competitiveness of Greek apples in relation to Italy, France and Netherland countries in German market. The selection of competitive countries became according to bigger export of apple activity globally, due to the fact that being members of European Union and by the orientation of their bigger exports the period 2000-2011. The selection of market became according to prospects they have or are likely to have the Greek exports of apples. The German market absorbs the biggest quantity of apples in European Union, is the 2rd bigger importer of apples globally and the majority of apple exports, in European Union, of Italy, Greece, France and Netherland directed to German market. For analysis of competitiveness of Greece and competitive countries were measured the following indexes: a) Grubel-Lloyd Index b) Export Market Share c) Net Export Index d) Revealed Comparative Advantage Index e) Specialization Index f) Trade Intensity Index This search includes also some points related to historical origin and botanical classification of apples, the agricultural policy generally and especially for apples, the production and trade of apples.
Η λειτουργία του χώρου ως υλικού πεδίου αγωγής: εφαρμογή σε ένα εκπαιδευτικό πρόγραμμα περιβαλλοντικής εκπαίδευσης στο νηπιαγωγείο
Creators: name: Γερμανός, Δ.
name: Γεωργόπουλος, Α.
name:  , Ομάδα Μεταπτυχιακών Φοιτητών
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Relations pertinent to classroom life, the educational process and the material educational field are inherently dependent factors of a self-complementary system. Our study of this system as well as our study of tie basic principles of Environmental Education resulted in the development of a versatile educational project applied to a specific kindergarten; that project was based on the group collaborative teaching method, the effect of space as a material educational field and a daily evaluation of the progress made. The end-result of this project was the development of several factors, such as interactions in the classroom, creative forms of behavior, and the role of the teacher as well as the development of the knowledge acquired by children.
description: Παιδαγωγική Επιθεώρηση, Vol. 33 (2002)
Feedback from galactic stellar bulges and hot gaseous haloes of galaxies
Creators: name: Tang, Shikui
name: Wang, Q. Daniel
name: Lu, Yu
name: Mo, H. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We demonstrate that the feedback from stellar bulges can play an essential role in shaping the halo gas of galaxies with substantial bulge components by conducting 1-D hydrodynamical simulations. The feedback model we consider consists of two distinct phases: 1) an early starburst during the bulge formation and 2) a subsequent long-lasting mass and energy injection from stellar winds of low-mass stars and Type Ia SNe. An energetic outward blastwave is initiated by the starburst and is maintained and enhanced by the long-lasting stellar feedback. For a MW-like galactic bulge, this blastwave sweeps up the halo gas in the proto-galaxy and heats up the surrounding medium to a scale much beyond the virial radius of the halo, thus the accretion of the halo hot gas can be completely stopped. In addition, the long-lasting feedback in the later phase powers a galactic bulge wind that is reverse-shocked at a large radius in the presence of surrounding intergalactic medium and hence maintains a hot gaseous halo. As the mass and energy injection decreases with time, the feedback evolves to a subsonic and quasi-stable outflow, which is enough to prevent halo gas from cooling. The two phases of the feedback thus re-enforce each-other's impact on the gas dynamics. The simulation results demonstrate that the stellar bulge feedback may provide a plausible solution to the long-standing problems in understanding the MW type galaxies, such as the "missing stellar feedback" problem and the "over-cooling" problem. The simulations also show that the properties of the hot gas in the subsonic outflow state depend sensitively on the environment and the formation history of the bulge. This dependence and variance may explain the large dispersion in the X-ray to B-band luminosity ratio of the low $L_X/L_B$ Es.
description: v2, discussions added, accepted for publication in MNRAS