cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Landau theory applied to phase transitions in calcium orthotungstate and isostructural compounds
Creators: name: Errandonea, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The pressure-driven tetragonal-to-monoclinic phase transition in CaWO4 and related scheelite-structured orthotungstates is analysed in terms of spontaneous strains. Based upon our previous high-pressure x-ray diffraction results and the Landau theory, it is suggested that the scheelite-to-fergusonite transition is of second order in nature.
description: 14 pages, 3 figures
title: Experimental forecasts of the ecological consequences of spatial management decisions: an experiment on sandeel and the Dogger Bank Natura 2000 process
Creators: name: Goldsborough, David
name: Sørensen, Thomas Kirk
name: Christensen, Asbjørn
Publisher: name: ASC 2013 - Theme session I
Year: 2024
Subjects: Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. When designing spatial plans for marine protected areas it has added value if the ecological effect of proposed spatial plans can be predicted. As an experiment the ecological consequences of suggested zoning proposals for fisheries closures within the cross border Natura 2000 sites of the Dogger Bank were simulated using spatially explicit models for the relatively sedentary fish the lesser sandeel (Ammodytes marinus). Three coupled models were used: POLCOMS, SLAM and SPAM. We tested and compared three proposed scenarios developed by members of the North Sea Regional Advisory Council (NSRAC), and the effect of closing the whole Natura 2000 site. The simulations were run with two options: without and with reallocation of displaced fishing effort. Results show that the effect of all three scenarios without reallocation of fishing effort on the biomass of sandeel is positive with up to approx. 3% increase in sandeel abundance on a North Sea scale. The NGOs’ proposal, which emphasises connectivity between areas, produces a biomass increase that is more than twice that of the fishing sector’s scenario, which is based more on avoiding valuable fishing grounds. With reallocation of displaced fishing effort the sandeel biomass also increases within the closed areas but for the whole sandeel population in the North Sea a slight decrease is predicted.
title: Using high-resolution fishing effort estimates in the design of protection measurements for vulnerable marine ecosystems
Creators: name: Burgos, Julian M.
name: Ragnarsson, Stefán Á.
name: Ólafsdóttir, Steinunn H.
Publisher: name: ASC 2013 - Theme session I
Year: 2024
Subjects: Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Cold-water corals (CWC) have high conservation value and are considered vulnerable marine ecosystems. The spatial distribution of CWC habitats is often patchy and restricted to specific bottom types or bathymetric features. To characterize the direct impact of commercial fisheries on CWC habitats it is necessary to quantify fishing effort at the highest spatial resolution possible. Here we utilized data from Electronic Logbook (ELB) and Vessel Monitoring System (VMS) to estimate fishing effort by otter trawlers and longliners at a resolution of 150-500 m. High-resolution fishing effort data allowed us to accurately delineate the fishery footprint and to evaluate its interactions with CWC habitats. During the establishment of new marine protected areas (MPAs), high resolution fishing effort data was essential to achieve conservation objectives while minimizing the closure of commercial fishing grounds.
Flexible Virtual Reality System for Neurorehabilitation and Quality of Life Improvement
Creators: name: Stanica, Iulia-Cristina
name: Moldoveanu, Florica
name: Portelli, Giovanni-Paul
name: Dascalu, Maria-Iuliana
name: Moldoveanu, Alin
name: Ristea, Mariana Georgiana
Publisher: name: arXiv
Year: 2020
Subjects: subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences
subject: I.3.7; I.3.8

description: As life expectancy is mostly increasing, the incidence of many neurological disorders is also constantly growing. For improving the physical functions affected by a neurological disorder, rehabilitation procedures are mandatory, and they must be performed regularly. Unfortunately, neurorehabilitation procedures have disadvantages in terms of costs, accessibility and a lack of therapists. This paper presents Immersive Neurorehabilitation Exercises Using Virtual Reality (INREX-VR), our innovative immersive neurorehabilitation system using virtual reality. The system is based on a thorough research methodology and is able to capture real-time user movements and evaluate joint mobility for both upper and lower limbs, record training sessions and save electromyography data. The use of the first-person perspective increases immersion, and the joint range of motion is calculated with the help of both the HTC Vive system and inverse kinematics principles applied on skeleton rigs. Tutorial exercises are demonstrated by a virtual therapist, as they were recorded with real-life physicians, and sessions can be monitored and configured through tele-medicine. Complex movements are practiced in gamified settings, encouraging self-improvement and competition. Finally, we proposed a training plan and preliminary tests which show promising results in terms of accuracy and user feedback. As future developments, we plan to improve the system's accuracy and investigate a wireless alternative based on neural networks.
description: 47 pages, 20 figures, 17 tables (including annexes), part of the MDPI Sesnsors "Special Issue Smart Sensors and Measurements Methods for Quality of Life and Ambient Assisted Living"
Genome mining for metabolic gene clusters in yeasts
Creators: name: Pyatt, Christopher
name: James, Steve
name: Elliston, Adam
name: Roberts, Ian
name: Dicks, Jo
Publisher: name: F1000 Research Limited
Year: 2019

description: Secondary metabolites from a variety of organisms, including bacteria, plants, and fungi, are used in industrial processes, in food production, and in healthcare. They are frequently produced by metabolic pathways that are spatially clustered on the genome and expressed only under certain conditions. Finding new gene clusters via computational genome mining is important in the search for new metabolites. The genomes of 880 taxonomically diverse strains from the UK National Collection of Yeast Cultures (NCYC; http://www.ncyc.co.uk) have been sequenced and offer a unique resource for genome mining.
A gene cluster discovery pipeline has been implemented in Python, making use of existing bioinformatics tools. We present a case study of 70 Rhodotorula genomes searched for a known carotenoid-producing gene cluster and, using a combination of established tools and ad hoc methods, for novel clusters. Several clusters are predicted in each species, showing potential for further exploitation. The pipeline aims to fill gaps in gene cluster discovery left by current genome mining tools.
This ongoing study reveals marked taxonomic peaks in gene cluster content and secondary metabolite production in specific areas of the yeast phylogeny. Certain Basidiomycete lineages display high numbers of biosynthetic genes often found in clusters, suggesting substantial metabolic potential.
A new approach to solve the Boltzmann-Langevin equation for fermionic systems
Creators: name: Rizzo, J.
name: Chomaz, Ph.
name: Colonna, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present a new method to introduce phase-space fluctuations in transport theories, corresponding to a full implementation of the Boltzmann-Langevin equation for fermionic systems. It is based on the procedure originally developed by Bauer et al. for transport codes employing the test particle method. In the new procedure, the Pauli principle is carefully checked, leading to a good reproduction of the correct fluctuations in the ``continuum limit'' ($h \to 0$). Accurate tests are carried out in one and two dimensional idealized systems, and finally results for a full 3D application are shown. We stress the reliability of this method, which can be easily plugged into existing tranport codes using test particles, and its general applicability to systems characterized by instabilities, like for instance multifragmentation processes.
description: submitted to Nucl. Phys. A
Radiation signal accompanying the Schwinger effect
Creators: name: Aleksandrov, I. A.
name: Panferov, A. D.
name: Smolyansky, S. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The properties of the forced oscillations of electron-positron plasma (EPP) generated from vacuum under the action of a short laser pulse are considered. Calculating the density of the conduction and polarization currents within the quantum kinetic approach, we demonstrate the presence of plasma oscillations at the frequency of the external field and its odd harmonics. It is expected that radiation generated by these plasma oscillations can be observed outside the interaction region, for example, outside the focal spot of two counterpropagating laser beams, and can serve as an indicator of the Schwinger mechanism of the EPP creation from vacuum.
description: 7 pages, 4 figures
VOLONTÀ LIBERA E ARBITRIO NEL SISTEMA DI ETICA DI FICHTE E NELL'INTRODUZIONE AI LINEAMENTI DI FILOSOFIA DEL DIRITTO DI HEGEL
Creators: name: Tafani, Daniela
Publisher: name: Zenodo
Year: 2009
Subjects: Fichtet's doctrine of freedom
Hegel's doctrine of freedom

description: Even if Fichte seems to start from Kant’s doctrine of freedom, the distinction
 between a sensible and an intelligible world is not conclusive for his theory of freedom,
 which becomes comprehensible only as from the principles of the doctrine of science
 and, in particular, from the distinction between being and thought. With his definition
 of freedom as substantialitas, Fichte lays stress more on independence and spontaneity
 than, as Kant had done instead, on the normative aspect of autonomy.
 Hegel builds his doctrine of freedom within the fichtian theoretical horizon: with
 respect to two potentially diverging tendencies which are present in the Sittenlehre – that
 towards considering the natural impulse and the pure impulse nothing but two different
 points of view on something essentially unitary and that towards defining freedom as
 independence from nature and as dominion of rationality on nature - Hegel’s doctrine of
 freedom starts from the first, preserving however also the demand to guarantee the
 supremacy of rationality, which is at the bottom of the second.
Simplifying terrain models and measuring terrain model accuracy
Creators: name: Andrews, David Scott
Publisher: name: University of British Columbia
Year: 2009

description: We describe a set of TIN simplification methods that enable the use of the triangulation hierarchy introduced by Kirkpatrick [Kir83] and modified by de Berg and Dobrindt [dBD95a, dBD95b]. This triangulation hierarchy can be used to form a terrain model combining areas with varying levels of detail. One variant of the delete simplification method formed simplifications with accuracy close to the greedy method. We also investigated different variables that can be used to measure the accuracy of our simplified terrain models. Although the use of derivative statistics did not significantly alter our evaluation of the performance of our simplification methods, we recommend that any future comparisons should be aware of these alternative variables of surface characterization.
Spin-transfer in bilayer magnetic nanopillars at high fields as a function of free layer thickness
Creators: name: Chen, W.
name: Kent, A. D.
name: Rooks, M. J.
name: Ruiz, N.
name: Sun, J. Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin transfer in asymmetric Co/Cu/Co bilayer magnetic nanopillars junctions has been studied at low temperature as a function of free-layer thickness. The phase diagram for current-induced magnetic excitations has been determined for magnetic fields up to 7.5 T applied perpendicular to the junction surface and free-layers thicknesses from 2 to 5 nm. The junction magnetoresistance is independent of thickness. The critical current for magnetic excitations decreases linearly with decreasing free-layer thickness, but extrapolates to a finite critical current in the limit of zero thickness. The limiting current is in quantitative agreement with that expected due to a spin-pumping contribution to the magnetization damping. It may also be indicative of a decrease in the spin-transfer torque efficiency in ultrathin magnetic layers.
description: 5 Pages, 4 Figures
title: Integrating ecosystem considerations into marine spatial management of human activities
Creators: name: Cormier, Roland
name: Rice, Jake
Publisher: name: ASC 2013 - Theme session I
Year: 2024
Subjects: Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. A key component of an ecosystems approach to marine spatial planning (MSP) is to develop spatial and temporal management measures for Drivers and their Pressures to reduce the risks to vulnerable ecosystems components and services. We present a planning framework that combined integrated ecosystem assessments with management measure gap analysis, and evaluatesg the feasibility of implementation in light of other threats that cannot be effectively spatially managed. It uses the ISO Bow tie pathway analyses to analyse and identify be the best place to implement a management measure to eliminate, avoid, control or mitigate risks. The approach provides a context for IEAs and focuses attention on the evaluation of management options that can be applied to the pressures resulting from human activities.
Finding strong, common and discriminating characteristics of clusters from thematic maps
Creators: name: Yu, YiQing
Publisher: name: University of British Columbia
Year: 2009

description: The goal of the thesis is to discover knowledge on large spatial databases. Specifically, it discusses the problem of extracting patterns and characteristics of clusters from thematic maps. For instance, a characteristic of an expensive housing cluster may be that the average household income is over 100,000 dollars. Three key issues are addressed in this thesis. The first issue is how to measure the interest/utility values of characteristics. In order to accommodate different kinds of thematic maps, two measures are proposed and analysed: one based on entropy, and the other on standard deviation. Both measures satisfy all the desirable properties, and work effectively in practice. The second issue is how to extract patterns from multiple clusters. Two pattern extraction operations are defined. The common() operation is able to find the common characteristics among multiple clusters. The different() operations is capable of discovering the characteristics which distinguish one cluster from another. The third issue is how to compute characteristics utility measures and pattern extraction operations efficiently. Four different methods are proposed and evaluated for the computation of utility measures. Complexity and experimental results indicates that a technique based on isothetic rectangle intersections is the most efficient, outperforming all the other techniques such as a technique based on R-tree technique. For the problem of how to extract patterns of multiple clusters efficiently. Two different methods for pattern extraction are evaluated. The technique based on isothetic rectangle intersections again outperforms the technique based on R-tree, and can extract patterns from hundreds of thematic maps in seconds of CPU time.
Predicting the Evolution of Photospheric Magnetic Field in Solar Active Regions Using Deep Learning
Creators: name: Bai, Liang
name: Bi, Yi
name: Yang, Bo
name: Hong, Jun-Chao
name: Xu, Zhe
name: Shang, Zhen-Hong
name: Liu, Hui
name: Ji, Hai-Sheng
name: Ji, Kai-Fan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The continuous observation of the magnetic field by Solar Dynamics Observatory (SDO)/Helioseismic and Magnetic Imager (HMI) produces numerous image sequences in time and space. These sequences provide data support for predicting the evolution of photospheric magnetic field. Based on the spatiotemporal long short-term memory(LSTM) network, we use the preprocessed data of photospheric magnetic field in active regions to build a prediction model for magnetic field evolution. Because of the elaborate learning and memory mechanism, the trained model can characterize the inherent relationships contained in spatiotemporal features. The testing results of the prediction model indicate that (1) the prediction pattern learned by the model can be applied to predict the evolution of new magnetic field in the next 6 hour that have not been trained, and predicted results are roughly consistent with real observed magnetic field evolution in terms of large-scale structure and movement speed; (2) the performance of the model is related to the prediction time; the shorter the prediction time, the higher the accuracy of the predicted results; (3) the performance of the model is stable not only for active regions in the north and south but also for data in positive and negative regions. Detailed experimental results and discussions on magnetic flux emergence and magnetic neutral lines finally show that the proposed model could effectively predict the large-scale and short-term evolution of the photospheric magnetic field in active regions. Moreover, our study may provide a reference for the spatiotemporal prediction of other solar activities.
description: 14 pages, 9 figures, 2 tables. accepted for publication in RAA
title: Marine Spatial Planning in Action: Pentland Firth and Orkney Waters case study
Creators: name: Turnbull, Shona
name: McCollin, Tracy
name: Green, James
Publisher: name: ASC 2013 - Theme session I
Year: 2024
Subjects: Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. The Marine (Scotland) Act 2010 makes provision for statutory marine planning in Scotland’s seas. • Regional marine spatial planning is being piloted in the Pentland Firth & Orkney Waters area (Figure 1). • This non statutory process will be used to inform the statutory Regional Marine Plans.
Temperature-dependent errors in nuclear lattice simulations
Creators: name: Lee, Dean
name: Thomson, Richard
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the temperature dependence of discretization errors in nuclear lattice simulations. We find that for systems with strong attractive interactions the predominant error arises from the breaking of Galilean invariance. We propose a local "well-tempered" lattice action which eliminates much of this error. The well-tempered action can be readily implemented in lattice simulations for nuclear systems as well as cold atomic Fermi systems.
description: 33 pages, 17 figures
Η παρουσία Νέων Θρησκευτικών Κινήσεων στα σχολικά εγχειρίδια της Δευτεροβάθμιας Εκπαίδευσης:
Creators: name: Καταφυγιώτου, Κλεοπάτρα Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Μαγεία
Σαηεντολογία
Γιόγκα
Magic
Scientology
Yoga

description: Το θέμα της μεταπτυχιακής μου εργασίας, αφορά την παρουσία των Νέων Θρησκευτικών Κινήσεων στα σχολικά εγχειρίδια της Δευτεροβάθμιας Εκπαίδευσης. Συγκεκριμένα, ερευνώνται οι Ν.Θ.Κ. της Μαγείας, του Σατανισμού, της Μασονίας, της Σαηεντολογίας, της Ενωτικής Εκκλησίας, της Αθεΐας και της Γιόγκα, όπως αυτές παρουσιάζονται στα σχολικά βιβλία του μαθήματος των Θρησκευτικών της Α΄ και Β΄ Λυκείου. Σκοπός της έρευνας ήταν η επισήμανση τυχόν παραλείψεων και αναντιστοιχιών ανάμεσα στα όσα προτείνει το Πρόγραμμα Σπουδών και σε όσα τελικά αναφέρουν οι συγγραφείς των σχετικών ενοτήτων των σχολικών εγχειριδίων. Η εργασία αποτελείται από τρία κεφάλαια. Στο πρώτο κεφάλαιο, εξετάζεται η έννοια της θρησκείας και το φαινόμενο των Ν.Θ.Κ. και ειδικότερα οι απαρχές τους, τα γενικά χαρακτηριστικά τους, ο τρόπος οργάνωσης τους, καθώς και η εξάπλωσή τους στην Ευρώπη και στην Ελλάδα. Στο δεύτερο κεφάλαιο, εξετάζονται οι Ν.Θ.Κ. που περιλαμβάνονται στο βιβλίο των Θρησκευτικών της Α΄Λυκείου. Στο τρίτο κεφάλαιο, μελετώνται οι Ν.Θ.Κ. όπως παρουσιάζονται στο διδακτικό εγχειρίδιο της Β΄Λυκείου, ενώ στο τέλος κάθε κεφαλαίου, επιχειρείται η αποτίμηση των σχετικών ενοτήτων των σχολικών βιβλίων. Στο τέλος της εργασίας, διατυπώνονται συγκεκριμένες προτάσεις ως προς τη βελτίωση τόσο του Προγράμματος Σπουδών, όσο και της ύλης των σχολικών εγχειριδίων.
description: The subject of my postgraduate study, concerns the presence of New Religious Movements in the school handbooks of the Secondary Education. Particularly the N.R.M. are searched for Magic, Satanism, Freemasonry, Scientology, Unification Church, Atheism and Yoga, as they are presented in the school books on A and B classes of greek senior high school. The goal of the research was to point out either some omissions that may have been done by chance or other discrepancies that probably have be occurred between in what the program of study proposed and what are finally reported by the writers, who have written the relative units of school handbooks. The work academy consists of three chapters. In the first chapter is examined both the signifance of religion and the phenomenon of N.R.M. and to be more specific, their beginning, their general characteristic, their way of organization and also their spread around Europe and Greece as well. In the second chapter are examined the N.R.M. which are included in school manuals of religious studies of A class of lycee. In the third chapter, are on N.R.M. as they are presented in the instructive handbook of B class while in the end of each course is attempted the assessment of relative units of school books. Finally, at the end of the academic work some proposals are expressed as for the improvement of the program of study and also for the curriculum of school handbooks.
Modeling Kilonova Light Curves: Dependence on Nuclear Inputs
Creators: name: Zhu, Y. L.
name: Lund, K.
name: Barnes, J.
name: Sprouse, T. M.
name: Vassh, N.
name: McLaughlin, G. C.
name: Mumpower, M. R.
name: Surman, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The mergers of binary neutron stars, as well as black hole-neutron star systems, are expected to produce an electromagnetic counterpart that can be analyzed to infer the element synthesis that occurred in these events. We investigate one source of uncertainties pertinent to lanthanide-rich outflows: the nuclear inputs to rapid neutron capture nucleosynthesis calculations. We begin by examining thirty-two different combinations of nuclear inputs: eight mass models, two types of spontaneous fission rates, and two types of fission daughter product distributions. We find that such nuclear physics uncertainties typically generate at least one order of magnitude uncertainty in key quantities such as the nuclear heating (one and a half orders of magnitude at one day post-merger), the bolometric luminosity (one order of magnitude at five days post-merger), and the inferred mass of material from the bolometric luminosity (factor of eight when considering the eight to ten days region). Since particular nuclear processes are critical for determining the electromagnetic signal, we provide tables of key nuclei undergoing $β$-decay, $α$-decay, and spontaneous fission important for heating at different times, identifying decays that are common among the many nuclear input combinations.
description: 29 pages, 17 figures, 4 tables
Atom interferometry gravity-gradiometer for the determination of the Newtonian gravitational constant G
Creators: name: Bertoldi, A.
name: Lamporesi, G.
name: Cacciapuoti, L.
name: de Angelis, M.
name: Fattori, M.
name: Petelski, T.
name: Peters, A.
name: prevedelli, M.
name: Stuhler, J.
name: Tino, G. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We developed a gravity-gradiometer based on atom interferometry for the determination of the Newtonian gravitational constant \textit{G}. The apparatus, combining a Rb fountain, Raman interferometry and a juggling scheme for fast launch of two atomic clouds, was specifically designed to reduce possible systematic effects. We present instrument performances and show that the sensor is able to detect the gravitational field induced by source masses. A discussion of projected accuracy for \textit{G} measurement using this new scheme shows that the results of the experiment will be significant to discriminate between previous inconsistent values.
description: 9 pages,9 figures, Submitted
Probing accretion variability in CR Cha with TESS and high-resolution spectroscopy
Creators: name: Zsidi, Gabriella
name: Hussain, Gaitee
name: Manara, Carlo
name: Ábrahám, Péter
name: Kóspál, Ágnes
Publisher: name: Zenodo
Year: 2021
Subjects: Young Stars

description: Young stellar objects are still surrounded by a circumstellar disk, from which material is accreting onto the stellar surface. This mass accretion process is essential in the formation and evolution of Sun-like stars. Although usually described with simple and static models, the accretion process is inherently time variable. Here, we present a multi-epoch analysis of CR Cha, a low-mass young stellar object with the age of 1-3 Myr. The aim of our work is to characterize the geometry and variability of the accretion process over a wide range of timescales in several accretion tracers using high-cadence photometric and high-resolution spectroscopic data. We analyse high-precision optical photometry obtained by the TESS space telescope, contemporaneous IJHK-band photometric measurements obtained by the SMARTS telescope, and combine these with high-resolution spectroscopic monitoring with the VLT/ESPRESSO and the 2.2m/FEROS spectrographs. Our extensive dataset allows us to examine the amplitude, timescale and pattern of variability in tracers which carry information on the distribution and the kinematics of the accreting material, the density structure of the inner disk, stellar activity, and the presence of outflows or jets. Where we have contemporaneous photometry and spectroscopy we link the photometric variability to spectroscopic variations. We complemented our data with spectropolarimetric observations from earlier years, which allow us to examine the role the large scale stellar magnetic field plays in the accretion process and to study spectroscopic variations over decadal timescales.
description: {"references": ["Hussain et al. (2009)", "Costigan et al. (2014)", "Bouvier et al. (1986)", "Carpenter et al. (2001)"]}
Direct experimental certification of quantum non-Gaussian character and Wigner function negativity of single-photon detectors
Creators: name: Hloušek, Josef
name: Ježek, Miroslav
name: Fiurášek, Jaromír
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Highly nonclassical character of optical quantum detectors, such as single-photon detectors, is essential for preparation of quantum states of light and a vast majority of applications in quantum metrology and quantum information processing. Therefore, it is both fundamentally interesting and practically relevant to investigate the nonclassical features of optical quantum measurements. Here we propose and experimentally demonstrate a procedure for direct certification of quantum non-Gaussianity and Wigner function negativity, two crucial nonclassicality levels, of photonic quantum detectors. Remarkably, we characterize the highly nonclassical properties of the detector by probing it with only two classical thermal states and a vacuum state. We experimentally demonstrate the quantum non-Gaussianity of single-photon avalanche diode even under the presence of background noise, and we also certify the negativity of the Wigner function of this detector. Our results open the way for direct benchmarking of photonic quantum detectors with a few measurements on classical states.
title: Εργαστηριακή μελέτη καθαρισμού στερεών πετρελαϊκών αποβλήτων
title: Experimental study of refinery solid wastes treatment
Creators: name: Σκληρης Δημητριος
Publisher: name: Technical University of Crete
Year: 2024

description: Η παρούσα εργασία έχει ως αντικείμενο μελέτης τα στερεά πετρελαϊκά απόβλητα και πώς
αυτά μπορούν να επεξεργαστούν με διαλύτες για την ανάκτηση επιπρόσθετων
πετρελαϊκών προϊόντων. Για το σκοπό αυτό δείγματα πετρελαϊκής ιλύος εκχυλίστηκαν με
υγρούς διαλύτες, υγροποιημένους καθώς και με μείγματα διαλυτών ώστε να βρεθεί ο
κατάλληλος διαλύτης εκχύλισης ο οποίος θα δώσει το μεγαλύτερο ποσοστό ανάκτησης
πετρελαϊκών κλασμάτων.
Αποτύπωση τμήματος των τειχών της Θεσσαλονίκης με laser scanner και σύγκριση με φωτογραμμετρική μέθοδο αποτύπωσης:
Creators: name: Παυλίδης, Μιλτιάδης Παύλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: λέϊζερ σάρωση
τείχη Θεσσαλονίκης
φωτογραμμετρία
laser scanner
walls of Thessaloniki
photogrammetry

description: Σκοπός της παρούσας εργασίας είναι η αποτύπωση τμήματος των τειχών της Θεσσαλονίκης με μια από τις πλέον σύγχρονες μεθόδους αποτύπωσης. Η μέθοδος αυτή είναι της σάρωσης η οποία βρίσκει τα τελευταία χρόνια όλο και περισσότερες εφαρμογές λόγω της βελτίωσης των αντίστοιχων τοπογραφικών οργάνων σάρωσης, τα γνωστά και ως Laser Scanners. Επίσης γίνεται αναφορά στην εξέλιξη τόσο των οργάνων σάρωσης όσο και των αντίστοιχων λογισμικών που τα συνοδεύουν. Στη συνέχεια λόγω της ύπαρξης προγενέστερης διπλωματικής εργασίας κατά την οποία μετρήθηκε το ίδιο τμήμα των τειχών της Θεσσαλονίκης με την φωτογραμμετρική μέθοδο κρίθηκε σκόπιμη η σύγκριση των αποτελεσμάτων των δύο μεθόδων. Για κάθε μέθοδο παρουσιάζονται αναλυτικά οι διαδικασίες συλλογής και επεξεργασίας των δεδομένων καθώς και η απόδοση των αποτελεσμάτων με τις αντίστοιχες ακρίβειές τους και τα συμπεράσματα που προκύπτουν.
description: This study is about mapping part of the ancient walls of Thessaloniki with a modern mapping method. This method is called “laser scanning” which is used very often in mapping projects recently due to the improvement of the laser scanners. Also, the improvement of the equipment and the respective software has been studied. Furthermore the results of the laser scanner method compared to the results of the photogrammetric method, which applied to the same part of the walls in a previous study. For each method there is a detailed presentation of the collecting and processing methods and a analysis of the accuracy of the results and finally the conclusions.
Quasinormal Modes and Stability Criterion of Dilatonic Black Hole in 1+1 and 4+1 Dimensions
Creators: name: Becar, Ramón
name: Lepe, Samuel
name: Saavedra, Joel
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the stability of black holes that are solutions of the dilaton gravity derived from string-theoretical models in two and five dimensions against to scalar field perturbations, using the Quasinormal Modes (QNMs) approach. In order to find the QNMs corresponding to a black hole geometry, we consider perturbations described by a massive scalar field non-minimally coupled to gravity. We find that the QNM's frequencies turn out to be pure imaginary leading to purely damped modes, that is in agreement with the literature of dilatonic black holes. Our result exhibits the unstable behavior of the considered geometry against the scalar perturbations. We consider both the minimal coupling case, i.e., for which the coupling parameter $ζ$ vanishes, and the case $ζ={1/4}$.
description: sevarl changes, some reference was added, 10 pages, 4 figures
title: Spatiotemporal overlap of oil spills and early life stages of fish - an important consideration for marine spatial planning?
Creators: name: Vikebø, Frode B.
name: Rønningen, Petter
name: Lien, Vidar S.
name: Meier, Sonnich
name: Reed, Mark
name: Ådlandsvik, Bjørn
name: kristiansen, Trond
Publisher: name: ASC 2013 - Theme session I
Year: 2024
Subjects: Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Oil exploration in the Lofoten and Vesterålen may provide valuable income to Norway and the local communities if allowed. However, the area is also of particular importance for multiple fish stocks , such as the Northeast Arctic cod. Can oil and fisheries activities coexist in these pristice waters or do we have to choose between short term or long term profits?
Omnidirectional field enhancements drive giant nonlinearities in epsilon-near-zero waveguides
Creators: name: Li, Gordon H. Y.
name: de Sterke, C. Martijn
name: Tuniz, Alessandro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Bulk materials possessing a relative electric permittivity $\varepsilon$ close to zero exhibit giant Kerr nonlinearities. However, harnessing this response in guided-wave geometries is not straightforward, due to the extreme and counter-intuitive properties of epsilon-near-zero materials. Here we investigate, through rigorous calculations of the Kerr nonlinear coefficient, how the remarkable nonlinear properties of such materials can be exploited in several different types of structures, including bulk films, plasmonic nanowires, and metal nanoapertures. We find the largest Kerr nonlinear response when both the modal area and the group velocity are simultaneously minimized, corresponding to omnidirectional field enhancement. The physical insights developed will be key for understanding and engineering nonlinear nanophotonic systems with extreme nonlinearities and point to new design paradigms.
Η έννοια της συζυγίας στα περί γάμου συγγράμματα του ιερού Αυγουστίνου:
Creators: name: Μπάτσιου, Χρυσάνθη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Γάμος
Αυγουστίνος
Συζυγία
Marriage
Augustine
Conjuction

description: Στην παρούσα εργασία προσπαθήσαμε να μελετήσουμε την έννοια της συζυγίας όπως αυτή παρουσιάζεται στα έργα του Ιερού Πατέρα, Αυγουστίνου. Μελετώντας λοιπόν τα έργα του Αυγουστίνου καταλήγουμε στο συμπέρασμα πως ο Ιερός Πατέρας δεν κατακρίνει τον γάμο από τη μια αλλά ούτε και τον ενθαρρύνει. Γι αυτόν ύψιστο αγαθό είναι η παρθενία και η ολοκληρωτική αφοσίωση στην πίστη του Χριστού την οποία πρέπει να φροντίζουμε και να διατηρούμε σε όλη μας τη ζωή. Γιατί όπως υποστηρίζει ένας έγγαμος πρώτα θα σκεφτεί τον-την σύζυγο του και μετά τα της πίστης. Ο Αυγουστίνος θεωρεί αδυναμία τον γάμο και πιστεύει ότι ο μόνος λόγος για τον οποίο θα πρέπει να τελείται είναι η τεκνοποίηση. Όσον αφορά τη σεξουαλικότητα και τη σεξουαλική επιθυμία τη θεωρεί αμαρτία και είναι αμαρτωλός όποιος υποκύπτει στις αδυναμίες της σάρκας και αναζητά τις απολαύσεις. Τις απόψεις του Αυγουστίνου ενστερνίζονται πολλοί σύγχρονοί του αλλά και νεώτεροι θεολόγοι επηρεάστηκαν από αυτές. Μέσω αυτής της εργασίας παρουσιάστηκαν οι βασικές θέσεις του Λατίνου Πατέρα αναφορικά με το γάμο και οι απόψεις του για το ποια θα πρέπει να είναι η συμπεριφορά του ανθρώπου σε θέματα γάμου, αφοσίωσης και της σεξουαλικότητας στη ζωή των ανθρώπων.
description: In the present work we tried to study the significance marriage as it is presented in the work of Holy Father, Augustin. Studying therefore the work of Augustine we are lead to the conclusion that the Holy Father neither blames the marriage nor encourages it. In his opinion paramount good is the virginity and the absolute devotion in the faith of Christ which we should attend to and maintain in all of our life, because, as he claims, one married man will think him-his spouse first and afterwards the faith. Augustine considers of marriage to be a weakness and he believes that the only reason for which it should be taken place is the procreation. With regard to the sexuality and the sexual desire he considers it to be a sin and everyone, who succumbs in weaknesses of flesh and seeks the enjoyments, is sinful. The opinion of Augustin is adopted by a lot of his moderns but also newer theologians were influenced by him. Via this work are presented the basic places of the Latin Father in regard to the marriage and his opinions about the behaviour of people on issues of marriage, devotion and sexuality in their life.
The Raychaudhuri equations: a brief review
Creators: name: Kar, Sayan
name: SenGupta, Soumitra
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a brief review on the Raychaudhuri equations. Beginning with a summary of the essential features of the original article by Raychaudhuri and subsequent work of numerous authors, we move on to a discussion of the equations in the context of alternate non--Riemannian spacetimes as well as other theories of gravity, with a special mention on the equations in spacetimes with torsion (Einstein--Cartan--Sciama--Kibble theory). Finally, we give an overview of some recent applications of these equations in General Relativity, Quantum Field Theory, String Theory and the theory of relativisitic membranes. We conclude with a summary and provide our own perspectives on directions of future research.
description: 35 pages, two figures, to appear in the special issue of Pramana dedicated to the memory of A. K. Raychaudhuri
Exploring the planetary-mass population in the Upper Scorpius association
Creators: name: Lodieu, Nicolas
name: Hambly, Nigel
name: Cross, Nicholas
Publisher: name: Zenodo
Year: 2021
Subjects: Stellar systems, clusters, and associations

description: We aim at identifying very low-mass isolated planetary-mass member candidates in the nearest OB association to the Sun, Upper Scorpius (145 pc; 5-10 Myr), to constrain the form and shape of the luminosity function and mass spectrum in this regime. We conducted a deep multi-band (Y=21.2, J=20.5, Z=22.0 mag) photometric survey of six square degrees in the central region of Upper Scorpius. We extend the current sequence of astrometric and spectroscopic members by about two magnitudes in Y and one magnitude in J, reaching potentially T-type free-floating members in the association with predicted masses below 5 Jupiter masses, well into the planetary-mass regime. We extracted a sample of 57 candidates in this area and present infrared spectroscopy confirming two of them as young L-type members with characteristic spectral features of 10 Myr-old brown dwarfs. Among the 57 candidates, we highlight 10 new candidates fainter than the coolest members previously confirmed spectroscopically. We do not see any obvious sign of decrease in the mass spectrum of the association, suggesting that star processes can form substellar objects with masses down to 4-5 Jupiter masses.
description: Young stars, brown dwarfs, planetary-mass objects, Upper Scorpius association
Karl Marx – David Ricardo : Η διαφορά στη δόμηση της πολιτικής οικονομίας:
Creators: name: Δαδούδης, Παναγιώτης Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Μαρξ
Ρικάρντο
Πολιτική Οικονομία
Marx
Ricardo
Political Economy

description: Στην παρούσα εργασία έγινε μία προσπάθεια να αναγνωριστούν και να αναλυθούν οι βασικές αρχές της Πολιτικής Οικονομίας, όπως αυτές έχουν παρουσιαστεί από τους δύο πιο ισχυρούς μελετητές αυτού του τομέα της Οικονομίας. Περισσότερο αναλυτικά, η έμφαση δίνεται στις διαφορές στη σκέψη και τη θεωρία όσον αφορά τα ζητήματα και τα θέματα της Πολιτικής Οικονομίας μεταξύ του Ντέιβιντ Ρικάρντο και του Κάρλ Μαρξ. Η Πολιτική Οικονομία αφορά τον κλάδο των Πολιτικών Επιστημών ο οποίος έχει ως βασικό αντικείμενο μελέτης τη σχέση και τη σύνδεση ανάμεσα στα πολιτικά και οικονομικά θέματα, καθώς και τις μεταξύ τους διαδικασίες. Οι πιο σημαντικοί σκεπτικιστές της Πολιτικής Οικονομίας θεωρούνται ο Άνταμ Σμιθ, ο Ντέιβιντ Ρικάρντο και ο Κάρλ Μαρξ, γεγονός που δικαιολογεί την επιλογή του μελετητή της συγκεκριμένης μεταπτυχιακής εργασίας να επικεντρωθεί στη δουλειά και το έργο των δύο τελευταίων. Το έργο του Ρικάρντο και του Μαρξ έχει επηρεάσει τη σκέψη όλων των μεταγενέστερων οικονομολόγων και από πολλούς θεωρείται ως η βάση των ζητημάτων τα οποία πραγματεύεται η Πολιτική Οικονομία, όπως η εργασία, το κεφάλαιο, η αξία, το εισόδημα, η πρόσοδος και άλλα. Στο πρώτο μέρος της μελέτης παρουσιάζεται περιληπτικά το σύγγραμμα του Ρικάρντο και οι βασικές του αρχές και θεωρίες και στο δεύτερο μέρος τα γραπτά κείμενα και οι σκέψεις του Μαρξ προκειμένου να εντοπιστούν οι διαφορές και ταυτόχρονα οι ομοιότητες μεταξύ των δύο οικονομολόγων. Σε τελικό επίπεδο, στο τρίτο μέρος παρουσιάζονται τα συμπεράσματα της εν λόγω σύγκρισης που αποτελούν και το κύριο αντικείμενο της εργασίας.
description: In the present study there has been a try to identify and analyze the basic principles of the Political Economy, as they have been presented by two of the most strong researchers at this field of Economy. Especially, the emphasis is given in the differences in the thought and the theory about all the issues of Political Economy between David Ricardo and Karl Marx. Political Economy is a branch of the Social Sciences that has as main object the relationship and the interaction between the political and economical issues and processes. The most important thinkers of the Political Economy are Adam Smith, David Ricardo and Karl Marx, a fact that justifies the decision of the researcher of this study to concentrate at the work of the two. The work of Ricardo and Marx has affected the thought of all the posterior economists and can be consider as the basis of the issues that Political Economy deals with, such as labor, capital, value, income, revenue and others. At the first part of this study is presented the in brief the writing of Ricardo and his basic theories and at the second part the writings and thoughts of Marx in order to identify the differences and also the similarities between them. Finally, at the third part are presented the conclusions of this comparison which consists and the main object of the study.
Finite-size Effects from Giant Magnons
Creators: name: Arutyunov, Gleb
name: Frolov, Sergey
name: Zamaklar, Marija
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In order to analyze finite-size effects for the gauge-fixed string sigma model on AdS_5 x S^5, we construct one-soliton solutions carrying finite angular momentum J. In the infinite J limit the solutions reduce to the recently constructed one-magnon configuration of Hofman and Maldacena. The solutions do not satisfy the level-matching condition and hence exhibit a dependence on the gauge choice, which however disappears as the size J is taken to infinity. Interestingly, the solutions do not conserve all the global charges of the psu(2,2|4) algebra of the sigma model, implying that the symmetry algebra of the gauge-fixed string sigma model is different from psu(2,2|4) for finite J, once one gives up the level-matching condition. The magnon dispersion relation exhibits exponential corrections with respect to the infinite J solution. We also find a generalisation of our one-magnon configuration to a solution carrying two charges on the sphere. We comment on the possible implications of our findings for the existence of the Bethe ansatz describing the spectrum of strings carrying finite charges.
description: 42 pages, many figures, movies are available at http://www.aei.mpg.de/~peekas/magnons/ ; v2: Additional comments included and references added
Applying formal method in the implementation of the information retrieval protocol Z39.50
Creators: name: Đõ̂, Bình
Publisher: name: University of British Columbia
Year: 2009

description: The success of any today large-scale software depends largely on the techniques applied to different phases of its whole life cycle. Various formal methods arid testing methods are developed to be applied to the specification phase and testing phase. Based on,the author's own experience as a member of a team implemeriting the Information Search and Retrieval Protocol, the Z39.50, this thesis explores application of formal methods and a methodology from a practical point of views.
title: The importance of collaborative research when making government level decisions: an example with top predators and marine renewable energy installations
Creators: name: Waggitt, James J.
name: Allcock, Zoe
name: M.C.Robbins, Alex
name: Wade, Helen
name: Bell, Paul S.
name: Furness, Robert W.
name: Jackson, Angus C.
name: Masden, Elizabeth A.
name: E.Scott, Beth
Publisher: name: ASC 2013 - Theme session I
Year: 2024
Subjects: Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. There is a legal requirement to minimise any negative impacts of tidal stream turbine devices on seabird populations. Most installations will be found within tidal passes in coastal regions These are spatiotemporally complex and dynamic habitats characterised by high habitat diversity. Identifying consistent species associations with either fast (turbine habitats) or slow (non-turbine habitats) habitats within a large sample of tidal passes could help inform government level decisions regarding the locations of devices in others earmarked for installations. Two questions are being asked within 5 different tidal passes: 1. Do species abundances differ between turbine and non-turbine habitats? 2. In turbine habitats, do abundances differ between tidal states suggesting that more individuals will encounter devices during certain times?