cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geometric Properties of the Three-Dimensional Ising and XY Models
Creators: name: Winter, Frank
name: Janke, Wolfhard
name: Schakel, Adriaan M. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The fractal structure of high-temperature graphs of the three-dimensional Ising and XY models is investigated by simulating these graphs directly on a cubic lattice and analyzing them with the help of percolation observables. The Ising graphs are shown to percolate right at the Curie critical point. The diverging length scale relevant to the graphs in the vicinity of the percolation threshold is shown to be provided by the spin correlation length. The fractal dimension of the high-temperature graphs at criticality is estimated to be $D = 1.7349(65)$ for the Ising and $D = 1.7626(66)$ for the XY model.
description: 19 pages
Topological Mott transition in a two band model of spinless fermions with on-site Coulomb repulsion
Creators: name: Karnaukhov, Igor N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In the framework of mean field approach, we study topological Mott transition in a two band model of spinless fermions on a square lattice at half filling. We consider the combined effect of the on-site Coulomb repulsion and the spin-orbit Rashba coupling. The ground state phase diagram is calculated as a function of the strength of the spin-orbit Rashba coupling and the Coulomb repulsion. The spin-orbit Rashba coupling leads to a distinct phase of matter, the topological semimetal. We study a new type of phase transition between the non-topological insulator and topological semimetal states. Topological phase state is characterized by the zero energy Majorana states, which there are in defined region of the wave vectors and are localized at the boundaries of the sample. The region of existence of the zero energy Majorana states tends to zero at the point of the Mott phase transition. The zero energy Majorana states are dispersionless (they can be considered as flat bands), the Chern number and Hall conductance are equal to zero (note in two dimensional model
description: 12 pages, 5 figures
Enhanced Thermoelectric Performance of Polycrystalline Si0.8Ge0.2 Alloys through the Addition of Nanoscale Porosity
Creators: name: Hosseini
name: Aria, S.
name: Romano
name: Giuseppe
name: Greaney
name: Alex, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Engineering materials to include nanoscale porosity or other nanoscale structures has become a well-established strategy for enhancing the thermoelectric performance of dielectrics. However, the approach is only considered beneficial for materials where the intrinsic phonon mean-free path is much longer than that of the charge carriers. As such, the approach would not be expected to provide significant performance gains in polycrystalline semiconducting alloys, such as SixGe1-x, where mass disorder and grains provide strong phonon scattering. In this manuscript, we demonstrate that the addition of nanoscale porosity to even ultrafine-grained Si0.8Ge0.2 may be worthwhile. The semiclassical Boltzmann transport equation was used to model electrical and phonon transport in polycrystalline Si0.8Ge0.2 containing prismatic pores perpendicular to the transport current. The models are free of tuning parameters and were validated against experimental data. The models reveal that a combination of pores and grain boundaries suppresses phonon conductivity to a magnitude comparable with the electronic thermal conductivity. In this regime, ZT can be further enhanced by reducing carrier concentration to the electrical and electronic thermal conductivity and simultaneously increasing thermopower. Although increases in ZT are modest, the optimal carrier concentration is significantly lowered, meaning semiconductors need not be so strongly supersaturated with dopants.
Design of two psychoacoustic models for real time implementation of a wideband audio codec
Creators: name: Koch, Anthony C.
Publisher: name: University of British Columbia
Year: 2009

description: Implementation of an audio codec (coder/decoder) is sought which meets a new standard proposed by the ISO/MPEG (International Standards Organization / Moving Pictures Experts Group) committee. The standard aims to encode wideband audio signals, achieving data compression by employing psychoacoustic modelling. By exploiting the properties of the human auditory system, psychoacoustic modelling shapes quantization noise spectrally to render it inaudible. This thesis provides the design of two new psychoacoustic models used to effect the real time implementation of the new ISO/MPEG audio codec on an existing hardware platform at MPR Teltech, a subsidiary of the British Columbia Telephone Co. The two new models are named: spreading function model and attenuation model. Both models overcome real time implementation problems of existing psychoacoustic models found in the literature by introducing new methods of calculating the global masking threshold and signal to mask ratios. Listening tests and simulation analyses show that while both models attain very high audio coding quality, the attenuation model is superior to the spreading function model, and is considered for implementation in the new ISO/MPEG codec on the existing hardware platform.
Βιοαποικοδομήσιμα Πολυμερικά Υλικά
Creators: name: Τριανταφυλλοπούλου, Σταυρούλα Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Βιοαποικοδομήσιμα υλικά
Πολυμερικά υλικά
Biodegradable materials
Polymeric materials

description: Η εύρεση υλικών φιλικών προς το περιβάλλον είναι αδιαμφισβήτητα κύριο μέλημα της πορείας της επιστήμης και τεχνολογίας των υλικών. Στην παρούσα εργασία ο βασικός σκοπός είναι μια βιβλιογραφική παρουσίαση των ιδιοτήτων και των εφαρμογών των βιοαποικοδομήσιμων πολυμερών. Σε ένα αρχικό στάδιο γίνεται μια γενική παρουσίαση των πολυμερών ως προς τη δομή, τις ιδιότητες, την ταξινόμηση και τις εφαρμογές τους και στη συνέχεια ακολουθεί αυτή η προσέγγιση και για τα βιοδιασπώμενα πολυμερή. Στα επόμενα κεφάλαια της εργασίας, πραγματοποιείται μια αναλυτική παράθεση των φυσικών βιοδιασπώμενων πολυμερών καθώς και των συνθετικών, ενώ στο τελευταίο κεφάλαιο τονίζεται η ευρεία εφαρμογή των βιοαποικοδομήσιμων υλικών σε διάφορους τομείς. Συγκεκριμένα, δίνεται έμφαση στις ιατρικές εφαρμογές, τον αγροτικό τομέα και την υφαντουργία, την συσκευασία αλλά και την αυτοκινητοβιομηχανία. Παράλληλα, συμπεριλαμβάνονται τα συμπεράσματα που προκύπτουν από τη μελέτη των βιοδιασπώμενων υλικών
description: Finding environmentally friendly materials is undoubtedly a major concern of materials science and technology. The main purpose of the present work is a bibliographic presentation of the properties and applications of biodegradable polymers. At an early stage a general overview of polymers is made regarding their structure, properties, classification and applications, followed by this approach for biodegradable polymers. In the following chapters, a detailed overview of natural biodegradable polymers as well as synthetic materials is presented, while the last chapter highlights the widespread application of biodegradable materials in various fields. Particular emphasis is placed on medical applications, the agricultural and textile sectors, packaging and the automotive industry. At the same time, the conclusions drawn from the study of biodegradable materials are included
Measurement of Stochastic Entropy Production
Creators: name: Tietz, C.
name: Schuler, S.
name: Speck, T.
name: Seifert, U.
name: Wrachtrup, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using fluorescence spectroscopy we directly measure entropy production of a single two-level system realized experimentally as an optically driven defect center in diamond. We exploit a recent suggestion to define entropy on the level of a single stochastic trajectory (Seifert, Phys. Rev. Lett. {\bf 95}, 040602 (2005)). Entropy production can then be split into one of the system itself and one of the surrounding medium. We demonstrate that the total entropy production obeys various exact relations for finite time trajectories.
description: Phys. Rev. Lett., in press
Generalization of spectral bulk-boundary correspondence
Creators: name: Tamura, Shun
name: Hoshino, Shintaro
name: Tanaka, Yukio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The bulk-boundary correspondence in one dimension asserts that the physical quantities defined in the bulk and at the edge are connected, as well established in the argument for electric polarization. Recently, a spectral bulk-boundary correspondence (SBBC), an extended version of the conventional bulk-boundary correspondence to energy-dependent spectral functions, such as Green's functions, has been proposed in chiral symmetric systems, in which the chiral operator anticommutes with the Hamiltonian. In this study, we extend the SBBC to a system with impurity scattering and dynamical self-energies, regardless of the presence or absence of a gap in the energy spectrum. Moreover, the SBBC is observed to hold even in a system without chiral symmetry, which substantially generalizes its concept. The SBBC is demonstrated with concrete models, such as superconducting nanowires and a Su-Schrieffer-Heeger model. Its potential applications and certain remaining issues are also discussed.
description: 16 pages, 12 figures
Linear "ship waves" generated in stationary flow of a Bose-Einstein condensate past an obstacle
Creators: name: Gladush, Yu. G.
name: El, G. A.
name: Gammal, A.
name: Kamchatnov, A. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Using stationary solutions of the linearized two-dimensional Gross-Pitaevskii equation, we describe the ``ship wave'' pattern occurring in the supersonic flow of a Bose-Einstein condensate past an obstacle. It is shown that these ``ship waves'' are generated outside the Mach cone. The developed analytical theory is confirmed by numerical simulations of the flow past body problem in the frame of the full non-stationary Gross-Pitaevskii equation.
description: 5 pages, 4 figures
Thermodynamic evolution of the $z=1.75$ galaxy cluster IDCS J1426.5+3508
Creators: name: Andreon, S.
name: Romero, C.
name: Castagna, F.
name: Ragagnin, A.
name: Devlin, M.
name: Dicker, S.
name: Mason, B.
name: Mroczkowski, T.
name: Sarazin, C.
name: Sievers, J.
name: Stanchfield, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present resolved thermodynamic profiles out to 500 kpc, about $r_{500}$, of the $z=1.75$ galaxy cluster IDCS J1426.5+3508 with 40 kpc resolution. Thanks to the combination of Sunyaev-Zel'dovich and X-ray datasets, IDCS J1426.5+3508 becomes the most distant cluster with resolved thermodynamic profiles. These are derived assuming a non-parametric pressure profile and a very flexible model for the electron density profile. The shape of the pressure profile is flatter than the universal pressure profile. The IDCS J1426.5+3508 temperature profile is increasing radially out to 500 kpc. To identify the possible future evolution of IDCS J1426.5+3508 , we compared it with its local descendants that numerical simulations show to be $0.65\pm0.12$ dex more massive. We found no evolution at 30 kpc, indicating a fine tuning between cooling and heating at small radii. At $30
description: MNRAS, in press. In v2 we only corrected author affiliations and spelling
Generation reliability modeling and analysis of wind power plants
Creators: name: D'Annunzio, Claudine
Publisher: name: The University of Texas at Austin
Year: 2004
Subjects: Wind generation
Capacity credit
Reliability modeling

description: The reliability impact of wind generation is evaluated using a set of reliability modeling and analysis tools implemented with MATLAB. As expected, the addition of wind generation increases the reliability of a power system. However, the extent to which the reliability is increase varies with the wind farm's penetration level. Using the LOLE, it is shown that as more wind generation is added to a power system the increase in reliability diminishes. Nonetheless, wind generators improved the reliability of a power system and deserve to be granted capacity credits. The ELCC method is used to calculate the capacity credit of wind generators. Capacity credits values between 16% and 32% were computed and correlate with the results of comparable studies. Capacity credit of wind farms also diminished with increasing penetration level.
The rigidity of crystalline color superconducting quark matter
Creators: name: Mannarelli, Massimo
name: Rajagopal, Krishna
name: Sharma, Rishi
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate the shear modulus of crystalline color superconducting quark matter, showing that this phase of dense, but not asymptotically dense, three-flavor quark matter responds to shear stress like a very rigid solid. To evaluate the shear modulus, we derive the low energy effective Lagrangian that describes the phonons that originate from the spontaneous breaking of translation invariance by the spatial modulation of the gap parameter $Δ$. These massless bosons describe space- and time-dependent fluctuations of the crystal structure and are analogous to the phonons in ordinary crystals. The coefficients of the spatial derivative terms of the phonon effective Lagrangian are related to the elastic moduli of the crystal; the coefficients that encode the linear response of the crystal to a shearing stress define the shear modulus. We analyze the two particular crystal structures which are energetically favored over a wide range of densities, in each case evaluating the phonon effective action and the shear modulus up to order $Δ^2$ in a Ginzburg-Landau expansion, finding shear moduli which are 20 to 1000 times larger than those of neutron star crusts. The crystalline color superconducting phase has long been known to be a superfluid -- by picking a phase its order parameter breaks the quark-number $U(1)_B$ symmetry spontaneously. Our results demonstrate that this superfluid phase of matter is at the same time a rigid solid. We close with a rough estimate of the pinning force on the rotational vortices which would be formed embedded within this rigid superfluid upon rotation. Our results raise the possibility that (some) pulsar glitches could originate within a quark matter core deep within a neutron star.
description: 38 pages, 5 figures. v3. Two new paragraphs in Section V (Conclusion); some additional small changes. A paragraph discussing supercurrents added in Section I (Introduction). Version to appear in Phys. Rev. D
SkyQuery: An Aerial Drone Video Sensing Platform
Creators: name: Bastani, Favyen
name: He, Songtao
name: Jiang, Ziwen
name: Bastani, Osbert
name: Madden, Sam
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Video-based sensing from aerial drones, especially small multirotor drones, can provide rich data for numerous applications, including traffic analysis (computing traffic flow volumes), precision agriculture (periodically evaluating plant health), and wildlife population management (estimating population sizes). However, aerial drone video sensing applications must handle a surprisingly wide range of tasks: video frames must be aligned so that we can equate coordinates of objects that appear in different frames, video data must be analyzed to extract application-specific insights, and drone routes must be computed that maximize the value of newly captured video. To address these challenges, we built SkyQuery, a novel aerial drone video sensing platform that provides an expressive, high-level programming language to make it straightforward for users to develop complex long-running sensing applications. SkyQuery combines novel methods for fast video frame alignment and detection of small objects in top-down aerial drone video to efficiently execute applications with diverse video analysis workflows and data distributions, thereby allowing application developers to focus on the unique qualities of their particular application rather than general video processing, data analysis, and drone routing tasks. We conduct diverse case studies using SkyQuery in parking monitoring, pedestrian activity mapping, and traffic hazard detection scenarios to demonstrate the generalizability and effectiveness of our system.
description: Onward! 2021
Συστήματα οφθαλμικής χορήγησης φαρμάκων
Creators: name: Τάκα, Ελισσάβετ Μιλτιάδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Χορήγηση
Μάτι
Φάρμακο
Delivery
Eye
Drug

description: Το αυτοσυναρμολογούμενο πεπτιδικό διάλυμα Ac-(RADA)4-CONH2, το οποίο μετατρέπεται σε υδρογέλη υπό φυσιολογικές συνθήκες, αξιολογήθηκε ως φορέας για την οφθαλμική συγχορήγηση του β- αναστολέα μηλεϊνική τιμολόλη και του α-αγωνιστή τρυγική βριμονιδίνη. Οι ρεολογικές μελέτες απέδειξαν ότι η προσθήκη των δύο φαρμάκων ενισχύει την ταχύτητα πήξης της πεπτιδικής υδροπηκτής και μειώνει την ισχύ της, γεγονός που επιβεβαιώθηκε και από τη μορφολογική αξιολόγησή της με τη χρήση ατομικής μικροσκοπίας δύναμης. Οι μελέτες της in vitro απελευθέρωσης των δύο δραστικών από την πεπτιδική υδροπηκτή κατέδειξαν την ταχεία και πλήρη αποδέσμευση και των δύο δραστικών, ενώ η ex vivo μελέτη διαπερατότητας απέδειξε την ενίσχυση της διαπέρασής τους δια μέσω κερατοειδή χιτώνα χοίρου σε σχέση με το διάλυμα των δύο δραστικών ενώσεων. Οι ιστολογικές μελέτες αποκάλυψαν καλή οφθαλμική ανεκτικότητα κατά την εφαρμογή της σύνθεσης, υποδεικνύοντας ότι οι αυτοσυναρμολογούμενες πεπτιδικές υδρογέλες είναι πολλά υποσχόμενα συστήματα παρατεταμένης οφθαλμικής χορήγησης φαρμάκων.
description: The self-assembling peptide Ac-(RADA)4-CONH2, which forms hydrogels in physiological conditions, was evaluated as carrier for the ocular co-delivery of the β-blocker timolol maleate and the α-agonist brimonidine tartrate. Rheological studies showed that the addition of the two drugs enhanced the rate of gelation of the peptide hydrogel and reduced its rigidity, observation that was further confirmed by the morphology study of the hydrogel using Atomic Force Microscopy. The in vitro release study of the two actives showed rapid and complete release of both compounds, while ex vivo permeation studies demonstrated the permeation enhancement of both drug across porcine cornea when loaded in the peptide hydrogel, compared to the drugs’ Histological studies revealed good ocular tolerability upon application of the formulation, suggesting that self-assempling peptide hydrogels are promising systems for sustained ocular drug delivery
Cu $K$-edge Resonant Inelastic X-Ray Scattering in Edge-Sharing Cuprates
Creators: name: Vernay, F.
name: Moritz, B.
name: Elfimov, I.
name: Geck, J.
name: Hawthorn, D.
name: Devereaux, T. P.
name: Sawatzky, G. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present calculations for resonant inelastic x-ray scattering (RIXS) in edge-shared copper oxide systems, such as CuGeO$_{3}$ and Li$_{2}$CuO$_{2}$, appropriate for hard x-ray scattering where the photoexcited electron lies above oxygen 2p and copper 3d orbital energies. We perform exact diagonalizations of the multi-band Hubbard and determine the energies, orbital character and resonance profiles of excitations which can be probed via RIXS. We find excellent agreement with recent results on Li$_{2}$CuO$_{2}$ and CuGeO$_{3}$ in the 2-7 eV photon energy loss range.
description: Updated with new data, expanded 9 pages, 9 figures
Observer based velocity and environment force estimation for rigid body control
Creators: name: Hacksel, Peter J.
Publisher: name: University of British Columbia
Year: 2008

description: Issues pertaining to the control of a rigid body are considered in this work. A magnetically levitated robotic wrist is here modelled as a rigid body subjected to both control and environment forces. All the algorithms presented here were implemented on the Maglev wrist for experimental verification. A good inertial model of the rigid body was needed for the estimation and control work in this work; a least squares identification procedure, found in the literature, was implemented for this purpose. Algorithms are developed for obtaining dynamic environment force and torque estimates from position errors in a velocity observer. Obtaining torque estimates from a nonlinear velocity observer is achieved by using the linear force observer as an analogue. Stability of the torque observer to a constant environment torque is proven for the one dimensional case only. Simulation and experiments are used to verify the stability in the three dimensional case. Environment force/torque measurements, alone useful for control purposes, are also used to correct a velocity observer. The resulting corrected observer design gives low noise velocity estimates and is robust in that it is not sensitive to errors caused by interaction with the environment. As a demonstration of the merit of the observer based work, a remote center of compliance controller is implemented. An inertial model is needed to provide feedforward that linearizes the dynamics to a. second order system. Corrected observer velocities are used in the feedforward and the derivative component of the control law. The linear dynamics about a remote center is verified by comparing the environment forces measured with the velocities observed.
Finding Phish in a Haystack: A Pipeline for Phishing Classification on Certificate Transparency Logs
Creators: name: Drichel, Arthur
name: Drury, Vincent
name: von Brandt, Justus
name: Meyer, Ulrike
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Current popular phishing prevention techniques mainly utilize reactive blocklists, which leave a ``window of opportunity'' for attackers during which victims are unprotected. One possible approach to shorten this window aims to detect phishing attacks earlier, during website preparation, by monitoring Certificate Transparency (CT) logs. Previous attempts to work with CT log data for phishing classification exist, however they lack evaluations on actual CT log data. In this paper, we present a pipeline that facilitates such evaluations by addressing a number of problems when working with CT log data. The pipeline includes dataset creation, training, and past or live classification of CT logs. Its modular structure makes it possible to easily exchange classifiers or verification sources to support ground truth labeling efforts and classifier comparisons. We test the pipeline on a number of new and existing classifiers, and find a general potential to improve classifiers for this scenario in the future. We publish the source code of the pipeline and the used datasets along with this paper (https://gitlab.com/rwth-itsec/ctl-pipeline), thus making future research in this direction more accessible.
description: Accepted at The 16th International Conference on Availability, Reliability and Security (ARES 2021)
RECONSTRUCTION AND ANALYSIS OF CANCERSPECIFIC GENE REGULATORY NETWORKS FROM GENE EXPRESSION PROFILES
Creators: name: Wireilla Scientific Publications (Australia)
Publisher: name: Zenodo
Year: 2025

description: The main goal of Systems Biology research is to reconstruct biological networks for its topologicalanalysis so that reconstructed networks can be used for the identification of various kinds of disease. Theavailability of high-throughput data generated by microarray experiments fuelled researchers to usewhole-genome gene expression profiles to understand cancer and to reconstruct key cancer-specific generegulatory network. Now, the researchers are taking a keen interest in the development of algorithm forthe reconstruction of gene regulatory network from whole genome expression profiles. In this study, acancer-specific gene regulatory network (prostate cancer) has been constructed using a simple and novelstatistics based approach. First, significant genes differentially expressing them self in the diseasecondition has been identified using a two-stage filtering approach t-test and fold-change measure. Next,regulatory relationships between the identified genes has been computed using Pearson correlationcoefficient. The obtained results has been validated with the available databases and literatures. Weobtained a cancer-specific regulatory network of 29 genes with a total of 55 regulatory relations in whichsome of the genes has been identified as hub genes that can act as drug target for the cancer diagnosis.
Spin-Current Shot Noise in Mesoscopic Conductors
Creators: name: He, Yuhui
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this paper, we present a method to investigate the spin-current shot noise in mesoscopic conductors, by using scattering matrix theory and Green's function technique. We first derive a general expression for the spin-current noise at zero-frequency limit, and extract the shot-noise component by discussing it at zero-temperature limit. The expression indicates that the spin-current shot noise in one lead is caused by the transmissions to the spin-resolved states in this lead and the interferences of these transmissions. As an application, we simulate the spin-current shot noise in a spin transistor, and discuss its dependence on the device parameters and the bias voltages applied to the transistor. The knowledge we gain from this study will help researchers to evaluate the spin-current shot noise in the future spintronic devices.
description: 6 figures
Αποτύπωση οδικού δικτύου δασικού συμπλέγματος Μαριών-Λιμεναρίων με σύγχρονα μέσα
Creators: name: Στάλιογλου, Θεοδώρα Σταύρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αποτύπωση
Δασικό οδικό δίκτυο
GPS-GNSS
Imprint
Forest road network

description: Η ολοένα αυξανόμενη ανάγκη για ακρίβεια στον προσδιορισμό θέσης οδήγησε στην εξέλιξη μεθόδων, αλλά και αντίστοιχων εργαλείων. Έτσι από το 1985 το GPS αρχίζει να καθιερώνεται ως καταγραφικό σύστημα εντοπισμού θέσης, η χρήση του οποίου στον τομέα της Δασολογίας διαδραματίζει ένα πολύ σημαντικό ρόλο, καθώς αποτελεί ένα χρήσιμο εργαλείο για την συλλογή δεδομένων, συνδυαστικά και με την χρήση των Γεωγραφικών Συστημάτων Πληροφοριών (GIS). Λόγω της έλλειψης ψηφιακής αποτύπωσης δασικού οδικού δικτύου, αποφασίστηκε η διεκπεραίωση της αποτύπωσης του οδικού δικτύου του δημόσιου δασικού συμπλέγματος Μαριών-Λιμεναρίων Θάσου με σύγχρονα μέσα. Για την επίτευξη αυτής της διαδικασίας χρησιμοποιήθηκε το GPS Leica CS10 GSSENSORS, χρησιμοποιώντας την μέθοδο εκκίνησης ροής (RTK=Real Time Kinematic) αποτυπώθηκε το δασικό οδικό δίκτυο του δασικού συμπλέγματος Μαριών-Λιμεναρίων Θάσου με την χρήση των δικτύων μόνιμων σταθμών (GNSS) της εταιρείας Metrica. Με τα δεδομένα που συλλέχθηκαν έγινε σύγκριση των υψομέτρων των μετρήσεων του GPS με τα υπάρχοντα DEM από ΓΥΣ, EUDEM, ALOSDEM, και από DEM της Διεύθυνσης Δασών Καβάλας. Έπειτα έγινε ο υπολογισμός της κατά μήκος κλίσης του δασικού οδικού δικτύου και ο εντοπισμός των τμημάτων που χρήζουν βελτίωσης. Τέλος γίνεται ο υπολογισμός των σημείων ορατότητας των Δημόσιων Δασών Θάσου από το συγκεκριμένο τμήμα του δασικού οδικού δικτύου.
description: The growing need for precision positioning has led to the development of methods and tools. Thus, in 1985 GPS began to be introduced as a location tracking system, whose use in forestry plays a very important role, as it is a useful tool for collecting data, both in combination with the use of Geographic Information Systems (GIS). Due to the lack of digital forest road network mapping, it was decided to carry out the mapping of the road network of the Maries-Limenaria Thassos public forest complex by modern means. To accomplish this process GPS Leica CS10 GSSENSORS was used by implementing the Real Time Kinematic (RTK) method using the Networks (GNSS) of the existing Metrica Station. The data collected were compared to the altitudes of the GPS measurements with the existing DEMs from EU DEM, ALOS DEM, Geographical Military Service and from the DEM of the Kavala Forestry Department. Then the longitudinal slope of the forest road network was calculated and the sections in need of improvement were identified. Finally the visibility points of Thasos Public Forests are calculated from this section of the forest road network.
Comprehensive Quantum Framework for Describing Retarded and Non-Retarded Molecular Interactions in External Electric Fields
Creators: name: Karimpour, Mohammad Reza
name: Fedorov, Dmitry V.
name: Tkatchenko, Alexandre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We employ various quantum-mechanical approaches for studying the impact of electric fields on both nonretarded and retarded noncovalent interactions between atoms or molecules. To this end, we apply perturbative and non-perturbative methods within the frameworks of quantum mechanics (QM) as well as quantum electrodynamics (QED). In addition, to provide a transparent physical picture of the different types of resulting interactions, we employ a stochastic electrodynamic approach based on the zero-point fluctuating field. Atomic response properties are described via harmonic Drude oscillators - an efficient model system that permits an analytical solution and has been convincingly shown to yield accurate results when modeling non-retarded intermolecular interactions. The obtained intermolecular energy contributions are classified as field-induced (FI) electrostatics, FI polarization, and dispersion interactions. The interplay between these three types of interactions enables the manipulation of molecular dimer conformations by applying transversal or longitudinal electric fields along the intermolecular axis. Our framework combining four complementary theoretical approaches paves the way toward a systematic description and improved understanding of molecular interactions when molecules are subject to both external and vacuum fields.
description: 23 pages, 10 figures; some slight improvement in comparison to the preceding version
Infrared Transmission Spectra for Extrasolar Giant Planets
Creators: name: Tinetti, G.
name: Liang, M. C.
name: Vidal-Madjar, A.
name: Ehrenreich, D.
name: Etangs, A. Lecavelier des
name: Yung, Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Among the hot Jupiters that transit their parent stars known to date, the two best candidates to be observed with transmission spectroscopy in the mid-infrared (MIR) are HD189733b and HD209458b, due to their combined characteristics of planetary density, orbital parameters and parent star distance and brightness. Here we simulate transmission spectra of these two planets during their primary eclipse in the MIR, and we present sensitivity studies of the spectra to the changes of atmospheric thermal properties, molecular abundances and C/O ratios. Our model predicts that the dominant species absorbing in the MIR on hot Jupiters are water vapor and carbon monoxide, and their relative abundances are determined by the C/O ratio. Since the temperature profile plays a secondary role in the transmission spectra of hot Jupiters compared to molecular abundances, future primary eclipse observations in the MIR of those objects might give an insight on EGP atmospheric chemistry. We find here that the absorption features caused by water vapor and carbon monoxide in a cloud-free atmosphere, are deep enough to be observable by the present and future generation of space-based observatories, such as Spitzer Space Telescope and James Webb Space Telescope. We discuss our results in light of the capabilities of these telescopes.
description: 12 pages, 6 figures, ApJ accepted
Simultaneous Perturbation Stochastic Approximation of the Quantum Fisher Information
Creators: name: Gacon, Julien
name: Zoufal, Christa
name: Carleo, Giuseppe
name: Woerner, Stefan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Quantum Fisher Information matrix (QFIM) is a central metric in promising algorithms, such as Quantum Natural Gradient Descent and Variational Quantum Imaginary Time Evolution. Computing the full QFIM for a model with $d$ parameters, however, is computationally expensive and generally requires $\mathcal{O}(d^2)$ function evaluations. To remedy these increasing costs in high-dimensional parameter spaces, we propose using simultaneous perturbation stochastic approximation techniques to approximate the QFIM at a constant cost. We present the resulting algorithm and successfully apply it to prepare Hamiltonian ground states and train Variational Quantum Boltzmann Machines.
Μοντερνισμός και Παράδοση στο έργο του Νίκου Καββαδία
Creators: name: Παρασκευά, Βασιλική Αργύριου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Νίκος Καββαδίας
Μοντερνισμός
Δημοτικό τραγούδι
Nikos Kavvadias
Modernism
Greek folk song

description: Η παρούσα εργασία εξετάζει τα ποιήματα του Νίκου Καββαδία στο εύρος και των τριών συλλογών του και κατά πόσο υπάρχουν στοιχεία μοντερνισμού στην ποίησή του, όσο και στοιχεία της ελληνικής δημοτικής παράδοσης. Στο πρώτο κεφάλαιο παρουσιάζονται τα κύρια λογοτεχνικά ρεύματα τα οποία έχουν επηρεάσει τον ποιητή και αποτελούν χρήσιμα εργαλεία για τη διερεύνηση της ποίησής του, καθώς και κάποιοι βασικοί όροι που χρησιμοποιούνται ως ορολογία της εργασίας και τα βιοεργογραφικά στοιχεία του ποιητή. Στο δεύτερο κεφάλαιο παρουσιάζεται η κριτική υποδοχή και η γραμματολογική κατάταξη του ποιητή και στη συνέχεια γίνεται προσπάθεια να καταδειχθούν μέσα από αναλύσεις των ποιημάτων του τα διάφορα στοιχεία που αποδεικνύουν πως η ποίηση του Ν. Καββαδία ιδιαίτερα στη δεύτερη και τρίτη συλλογή του είναι μια ποίηση μοντέρνα παρά το παραδοσιακό στιχουργικό περίβλημά της. Στο τρίτο κεφάλαιο αφού αναφερθούν τα βασικά δομικά στοιχεία του δημοτικού τραγουδιού καταγράφονται έτσι όπως εντοπίστηκαν μέσα στο έργο του ποιητή και διαπιστώνεται πως η περίπτωση του Ν. Καββαδία αποτελεί μοναδικό παράδειγμα ποιητή που στο έργο του συμφύρονται μοντερνιστικά γνωρίσματα και υπερρεαλιστικοί τρόποι γραφής μαζί με γνωρίσματα από την ελληνική δημοτική παράδοση και όλα αυτά δοσμένα σε έμμετρη στιχουργική μορφή.
description: This paper examines the poems of Nikos Kavvadias in the range of all three of his collections, and whether there is evidence of modernism in his poetry, as well as elements of the Greek folklore tradition. Noting an obvious evolution in his poetry from the first collection to the last, this paper tries to outline how the poet goes through a symbolic poetry in a completely modern and in what ways this transition is realized. The aim of this thesis is to detect modernistic and surrealistic traits through the close reading of the poems and then trace and catalogue elements of folk songs that exist in his poetry. The first chapter presents the main literary movements that have influenced the poet and are useful tools for analyze his poetry, as well as some basic terms used as terminology of the paper and information about poet’s work and life. In the second chapter is presented the critical reception and classification of the poet and then an attempt is made to demonstrate through analyses of his poems the various elements that prove how the poetry of N. Kavvadias, particularly in his second and third collection, is a modern poetry despite its traditional lyricizing case. In the third chapter, after mentioning the basic building blocks of the folk song are catalogued as identified in the work of the poet and it is noted that the case of N. Kavvadias is a unique example of a poet who in his work modernist features and surrealistic ways of writing are entwined, along with traits from the Greek folk tradition and all these are given in verse lyrical form.
Resilient Machine Learning for Networked Cyber Physical Systems: A Survey for Machine Learning Security to Securing Machine Learning for CPS
Creators: name: Olowononi, Felix
name: Rawat, Danda B.
name: Liu, Chunmei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Cyber Physical Systems (CPS) are characterized by their ability to integrate the physical and information or cyber worlds. Their deployment in critical infrastructure have demonstrated a potential to transform the world. However, harnessing this potential is limited by their critical nature and the far reaching effects of cyber attacks on human, infrastructure and the environment. An attraction for cyber concerns in CPS rises from the process of sending information from sensors to actuators over the wireless communication medium, thereby widening the attack surface. Traditionally, CPS security has been investigated from the perspective of preventing intruders from gaining access to the system using cryptography and other access control techniques. Most research work have therefore focused on the detection of attacks in CPS. However, in a world of increasing adversaries, it is becoming more difficult to totally prevent CPS from adversarial attacks, hence the need to focus on making CPS resilient. Resilient CPS are designed to withstand disruptions and remain functional despite the operation of adversaries. One of the dominant methodologies explored for building resilient CPS is dependent on machine learning (ML) algorithms. However, rising from recent research in adversarial ML, we posit that ML algorithms for securing CPS must themselves be resilient. This paper is therefore aimed at comprehensively surveying the interactions between resilient CPS using ML and resilient ML when applied in CPS. The paper concludes with a number of research trends and promising future research directions. Furthermore, with this paper, readers can have a thorough understanding of recent advances on ML-based security and securing ML for CPS and countermeasures, as well as research trends in this active research area.
Complexity for Conformal Field Theories in General Dimensions
Creators: name: Chagnet, Nicolas
name: Chapman, Shira
name: de Boer, Jan
name: Zukowski, Claire
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study circuit complexity for conformal field theory states in arbitrary dimensions. Our circuits start from a primary state and move along a unitary representation of the Lorentzian conformal group. Different choices of distance functions can be understood in terms of the geometry of coadjoint orbits of the conformal group. We explicitly relate our circuits to timelike geodesics in anti-de Sitter space and the complexity metric to distances between these geodesics. We extend our method to circuits in other symmetry groups using a group theoretic generalization of the notion of coherent states.
description: 5+18 pages, 2 figures; v2: substantial new results about geodesics in the complexity metric and the relation to holography
Photon propagation in magnetic and electric fields with scalar/pseudoscalar couplings: a new look
Creators: name: Gabrielli, E.
name: Huitu, K.
name: Roy, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the minimal coupling of two photons to neutral scalar and pseudoscalar fields, as for instance in the case of the Higgs boson and axion, respectively. In this framework, we analyze the photon dispersion relations in the presence of static and homogeneous external magnetic and electric fields, by taking into account the contribution of the imaginary part of the scalar/pseudoscalar self-energy. We show that this contribution cannot be neglected when it is of the same order as the photon-scalar/pseudoscalar mixing term. In addition to the usual light-like photon propagation mode, with a refraction index n > 1, a massive mode with mass of the order of the coupled boson mass can be induced, provided that the external field is above a particular critical value. Depending on the values of the external field, photon energy, and mass of the scalar/pseudoscalar particle, the scalar/pseudoscalar width could induce a sizeable rate of photon splitting in two photons due to a strong resonant phenomenon. This effect has no practical laboratory applications for the Higgs physics due to the very large critical external magnetic or electric fields involved, for a photon energy of the order of a TeV. However, it can have relevant consequences in the axion physics or in any other scenario where light neutral scalar/pseudoscalar fields have minimal coupling with two photons.
description: 40 pages, LaTeX, 5.eps Figures, new appendix and results included, misprints corrected, conclusions unchanged. Version to appear on Phys. Rev. D
Routing algorithms as tools for integrating social distancing with emergency evacuation
Creators: name: Tsai, Yi-Lin
name: Rastogi, Chetanya
name: Kitanidis, Peter K.
name: Field, Christopher B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Computers and Society (cs.CY)
subject: Human-Computer Interaction (cs.HC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: One of the lessons from the COVID-19 pandemic is the importance of social distancing, even in challenging circumstances such as pre-hurricane evacuation. To explore the implications of integrating social distancing with evacuation operations, we describe this evacuation process as a Capacitated Vehicle Routing Problem (CVRP) and solve it using a DNN (Deep Neural Network)-based solution (Deep Reinforcement Learning) and a non-DNN solution (Sweep Algorithm). A central question is whether Deep Reinforcement Learning provides sufficient extra routing efficiency to accommodate increased social distancing in a time-constrained evacuation operation. We found that, in comparison to the Sweep Algorithm, Deep Reinforcement Learning can provide decision-makers with more efficient routing. However, the evacuation time saved by Deep Reinforcement Learning does not come close to compensating for the extra time required for social distancing, and its advantage disappears as the emergency vehicle capacity approaches the number of people per household.
Αττικά μελανόμορφα αγγεία και η εικονογραφία τους στη Μακεδονία
Creators: name: Παπαδοπούλου, Ελένη Ιορδάνη
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αττικά ελανόμορφα αγγεία
Εικονογραφία
Μακεδονία
Attic Black Figured Vases
Iconography
Macedonia

description: Σκοπός της παρούσας διπλωματικής εργασίας ήταν η μελέτη των αττικών μελανόμορφων αγγείων και της εικονογραφίας τους στη Μακεδονία. Το εξεταζόμενο υλικό χρονολογείται στην αρχαϊκή περίοδο και προήλθε κυρίως μέσα από τις ανασκαφές των τελευταίων χρόνων σε οικισμούς, νεκροταφεία και ιερά της Μακεδονίας. Η εργασία διαιρείται σε δύο βασικά μέρη. Στο πρώτο μέρος παρουσιάζονται συνοπτικά οι θέσεις της Μακεδονίας στις οποίες εντοπίστηκε αττική μελανόμορφη κεραμική, ενώ στα επόμενα κεφάλαια εξετάζονται λεπτομερώς τα σχήματα, οι αγγειογράφοι και τα εργαστήρια που διακοσμούσαν αττικά μελανόμορφα αγγεία από το α΄ μισό του 6ου αι. π.Χ. έως και το α΄ μισό του 5ου αι. π.Χ. Το δεύτερο μέρος σχετίζεται με την εικονογραφία των αγγείων αυτών, όπου εξετάζονται παραστάσεις με ζώα και μυθικά όντα, μυθολογικές σκηνές και σκηνές καθημερινής ζωής. Στα συμπεράσματα της εργασίας έγινε μία ανακεφαλαίωση των σημαντικότερων δεδομένων της μελέτης, τα οποία εμπλουτίζουν χάρτες και στατιστικά γραφήματα.
description: The aim of the present thesis was the study of the attic black figured vases and their iconography in Macedonia. The material examined dates back to the archaic period and came to light mainly from excavations of recent years in settlements, cemeteries and sanctuaries of Macedonia. The thesis is divided into two main parts. The first part briefly presents the areas where attic black figured pottery was found, while the following chapters examine in detail the shapes, the painters and the workshops that decorated attic black figured vases, dating from the first half of the sixth century B.C. up to the first half of fifth century B.C. The second part is related to the iconography of these vases, where depictions of animals and mythical beings, mythological scenes and scenes of everyday life are examined. At the conclusions of the thesis there is a summary of the most important data of the study which are enriched with maps and statistical charts.
Improved measurement of $ψ(2S)$ decays into $τ^{+}τ^{-}$
Creators: name: BES Collaboration
name: AblikimJ, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using 14M $ψ(2S)$ events collected at BESII, the branching fraction of $ψ(2S)\to τ^{+}τ^{-}$ is measured to be $Br_{ττ}=(3.10\pm 0.21\pm 0.38)\times 10^{-3}$, where the first error is statistical and the second is systematic.
description: 12 pages, 1 figure
Reinforcement Learning for IoT Security: A Comprehensive Survey
Creators: name: Uprety, Aashma
name: Rawat, Danda B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The number of connected smart devices has been increasing exponentially for different Internet-of-Things (IoT) applications. Security has been a long run challenge in the IoT systems which has many attack vectors, security flaws and vulnerabilities. Securing billions of B connected devices in IoT is a must task to realize the full potential of IoT applications. Recently, researchers have proposed many security solutions for IoT. Machine learning has been proposed as one of the emerging solutions for IoT security and Reinforcement learning is gaining more popularity for securing IoT systems. Reinforcement learning, unlike other machine learning techniques, can learn the environment by having minimum information about the parameters to be learned. It solves the optimization problem by interacting with the environment adapting the parameters on the fly. In this paper, we present an comprehensive survey of different types of cyber-attacks against different IoT systems and then we present reinforcement learning and deep reinforcement learning based security solutions to combat those different types of attacks in different IoT systems. Furthermore, we present the Reinforcement learning for securing CPS systems (i.e., IoT with feedback and control) such as smart grid and smart transportation system. The recent important attacks and countermeasures using reinforcement learning B in IoT are also summarized in the form of tables. With this paper, readers can have a more thorough understanding of IoT security attacks and countermeasures using Reinforcement Learning, as well as research trends in this area.