cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Floquet higher-order topological phases in momentum space
Creators: name: Zhou, Longwen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Higher-order topological phases (HOTPs) are characterized by symmetry-protected bound states at the corners or hinges of the system. In this work, we reveal a momentum-space counterpart of HOTPs in time-periodic driven systems, which are demonstrated in a two-dimensional extension of the quantum double-kicked rotor. The found Floquet HOTPs are protected by chiral symmetry and characterized by a pair of topological invariants, which could take arbitrarily large integer values with the increase of kicking strengths. These topological numbers can also be measured from the chiral dynamics of wave packets. Under open boundary conditions, multiple quartets Floquet corner modes with zero and $π$ quasienergies emerge in the system and coexist with delocalized bulk states at the same quasienergies, forming second-order Floquet topological bound states in continuum. The numbers of these corner modes are further counted by the bulk topological invariants according to the relation of bulk-corner correspondence. Our findings thus extend the study HOTPs to momentum-space lattices, and further uncover the richness of HOTPs and corner-localized bound states in continuum in Floquet driven systems.
description: 11 pages, 5 figures
Operator Gauge Symmetry in QED
Creators: name: Khademi, Siamak
name: Nasiri, Sadollah
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper, operator gauge transformation, first introduced by Kobe, is applied to Maxwell's equations and continuity equation in QED. The gauge invariance is satisfied after quantization of electromagnetic fields. Inherent nonlinearity in Maxwell's equations is obtained as a direct result due to the nonlinearity of the operator gauge transformations. The operator gauge invariant Maxwell's equations and corresponding charge conservation are obtained by defining the generalized derivatives of the first and second kinds. Conservation laws for the real and virtual charges are obtained too. The additional terms in the field strength tensor are interpreted as electric and magnetic polarization of the vacuum.
description: Published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Quantum Anomalous Hall Effect in Magnetic Doped Topological Insulators and Ferromagnetic Spin-Gapless Semiconductors -- A Perspective Review
Creators: name: Nadeem, Muhammad
name: Hamilton, Alex R.
name: Fuhrer, Michael S.
name: Wang, Xiaolin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Quantum anomalous Hall effect, with a trademark of dissipationless chiral edge states for electronics/spintronics transport applications, can be realized in materials with large spin-orbit coupling and strong intrinsic magnetization. After Haldane seminal proposal, several models have been presented to control/enhance the spin-orbit coupling and intrinsic magnetic exchange interaction. After brief introduction of Haldane model for spineless fermions, following three fundamental quantum anomalous Hall models are discussed in this perspective review: (i) low-energy effective four band model for magnetic-doped topological insulator (Bi,Sb)2Te3 thin films, (ii) four band tight-binding model for graphene with magnetic adatoms, and (iii) two (three) band spinfull tight-binding model for ferromagnetic spin-gapless semiconductors with honeycomb (kagome) lattice where ground state is intrinsically ferromagnetic. These models cover two-dimensional Dirac materials hosting spinless, spinful and spin-degenerate Dirac points where various mass terms open a band gap and lead to quantum anomalous Hall effect. With emphasize on the topological phase transition driven by ferromagnetic exchange interaction and its interplay with spin-orbit-coupling, we discuss various symmetry constraints on the nature of mass term and the materialization of these models. We hope this study will shed light on the fundamental theoretical perspectives of quantum anomalous Hall materials.
A Quartic Conformally Covariant Differential Operator for Arbitrary Pseudo-Riemannian Manifolds (Summary)
Creators: name: Paneitz, Stephen M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: This is the original manuscript dated March 9th 1983, typeset by the Editors for the Proceedings of the Midwest Geometry Conference 2007 held in memory of Thomas Branson. Stephen Paneitz passed away on September 1st 1983 while attending a conference in Clausthal and the manuscript was never published. For more than 20 years these few pages were circulated informally. In November 2004, as a service to the mathematical community, Tom Branson added a scan of the manuscript to his website. Here we make it available more formally. It is surely one of the most cited unpublished articles. The differential operator defined in this article plays a key role in conformal differential geometry in dimension 4 and is now known as the Paneitz operator.
description: This is a contribution to the Proceedings of the 2007 Midwest Geometry Conference in honor of Thomas P. Branson, published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
ERRATA
Creators: name: Farooq, Mustafa
Publisher: name: History of Radiology
Year: 2024

description: Abstract

Functional magnetic resonance imaging (fMRI) has revolutionized the field of neurosurgery by providing a dynamic method for mapping brain activity, enabling more precise and safer surgical interventions. Unlike traditional MRI, which provides structural images, fMRI captures changes in blood flow, revealing functional regions of the brain in real time. Since its development in the early 1990s, fMRI has had a profound influence on pre-surgical planning and brain mapping, particularly for patients with brain tumors located near critical areas responsible for speech, movement, and vision. fMRI allows neurosurgeons to map essential functional areas, minimizing the risk of postoperative deficits and enhancing surgical precision. Additionally, the integration of fMRI with other imaging techniques, such as diffusion tensor imaging (DTI), has further refined the ability to map neural pathways and critical structures, offering a more comprehensive view of brain connectivity. The use of fMRI during awake craniotomies, where patients remain conscious during tumor resection, has significantly improved outcomes by allowing real-time monitoring of brain function. Despite its advantages, fMRI is not without limitations, including variability in patient responses and indirect measures of brain activity. However, advancements in technology, such as artificial intelligence and high-resolution imaging, promise to enhance the accuracy and reliability of fMRI in neurosurgical applications. This review discusses the historical development of fMRI, its transformative impact on neurosurgical techniques, and future directions for integrating fMRI with emerging technologies to improve patient outcomes.
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Stuart (Barque)
Creators: name: Meherzi, Liz
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Stuart (barque) was built in Dundee in 1877 and registered in Liverpool. From online sources the ship sailed from the UK to the West Coast of North and South America, UK to Asia, Asia to South America and UK to Australia/New Zealand. On Apr 6th 1901 while sailing from Liverpool to New Zealand the Stuart ran aground at Porth Ty-Mawr, Porth Colmon, Caernarfonshire. The ship could not be refloated and remains a wreck on the coast to this today.
BADIIY MATNNING KONSEPTUAL STRUKTURASI
Creators: name: Ulugova Shoxida Shoxruxovna, Ispan va italyan tillari kafedrasi dotsenti Samarqand davlat chet tillar instituti
Publisher: name: Zenodo
Year: 2024

description: Mazkur maqolada badiiy matnning kognitiv xususiyatlarini aniqlashda muhim o‘rin tutgan konseptual strukturalar haqida so‘z yuritiladi. Bir qator olimlar, jumladan, R. Zwaan, T. van Deyk, M. Jonson, L. Talmy, M. Terner, D. Ashurova, Sh. Safarov, M. Galeeva va boshqalar konseptual strukturalar va ularning xususiyatlari yuzasidan izlanishlar olib borganlar.

Kalit so‘zlar:  tasviriy sxema, geshtalt, makon va zamon, konseptual tizim makrostruktura.
The XMM-Newton RGS spectrum of the high luminosity Seyfert 1 galaxy Markarian 509
Creators: name: Smith, R. A. N.
name: Page, M. J.
name: Branduardi-Raymont, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a detailed analysis of the soft X-ray spectrum of the Seyfert 1 galaxy Markarian 509 taken with the XMM-Newton Reflection Grating Spectrometer. An underlying power-law continuum and three warm absorber phases provide a good fit to the data along with a number of broad and narrow emission lines. Our three warm absorber phases each have different ionization parameters and column densities. We identify a low ionization, log xi=0.89, high outflow velocity phase producing an Fe M-shell UTA feature along with absorption from O VI and N VI. There is an intermediate phase, log xi=2.14, showing absorption from H-like carbon and nitrogen and He-like neon and oxygen. The third, high ionization, log xi=3.26, low outflow velocity phase contains absorption from O VIII, Ne X and highly ionized iron. All phases are blueshifted with respect to the systemic velocity with flow velocities ranging from -60km/s to -510km/s. The observed broad emission features have an RMS velocity of ~8000km/s for the C VI and O VII lines.
description: 10 pages, 7 figures. To be published in Astronomy and Astrophysics journal
Literacy, identity, and power: the experience of adult El Salvadoran refugees in Canadian government-sponsored ESL and job-training programs
Creators: name: MacLean, Ian B.
Publisher: name: University of British Columbia
Year: 2009

description: This study addresses a concern for the experience of participants in Canadian Government sponsored language and job-training programs for recent immigrants, specifically El Salvadoran refugees. The research has sought to uncover, through interviews with two former students, some of their impressions and insights concerning their participation in a Canadian government sponsored language and job-training program. The interviews were structured to account for historical, cultural, political, ideological and educational events and influences in El Salvador and Canada that contributed to the formation of their subjective experience within the context of the Canadian programs in which they participated. Analysis of the interview transcripts and notes made during and after the interviews revealed several emergent themes. These were: political activity and war, teachers as leaders, religion, what is good teaching, adjustment to Canada, values and hopes, and the need for ESL and job-training programs. In the views of the two informants, the teacher-student relationship, based on awareness, communication and respect emerged as a very important feature of successful pedagogy . The findings are related and discussed in relation to Canadian society. The instructional implications are discussed with reference to relevant pedagogical approaches.
Tensor and vector formulations of resonance effective theory
Creators: name: Kampf, Karol
name: Novotny, Jiri
name: Trnka, Jaroslav
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The main idea of the first order formalism is demonstrated on a toy example of spin-0 particle. The full formalism for spin-1 is applied to the vector formfactor of the pion and its high-energy behaviour is studied.
description: 6 pages, 1 figure; presented by K.K. at Final Euridice Meeting
Λογοτεχνία και Διαδίκτυο: Ελληνικές ιστοσελίδες και ιστολόγια για την ποίηση.
Creators: name: Φουρκιώτη, Μαρία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Λογοτεχνία
Ποίηση
Διαδίκτυο
Literature
Poetry
Internet

description: Με δεδομένο ότι, διεθνώς, η ποίηση εμφανίζει σταθερά αυξανόμενη και ιδιαίτερα δυναμική παρουσία στο Διαδίκτυο, αξιοποιώντας δημιουργικά τις δυνατότητες του μέσου, η παρούσα διπλωματική εστιάζει στην ελληνική περίπτωση, σε μια απόπειρα να καταγράψει, να ταξινομήσει και να αξιολογήσει ιστοσελίδες και ιστολόγια που αφορούν την ποιητική τέχνη. Αρχικά, αναπτύσσεται το θεωρητικό πλαίσιο της θεματικής με βάση την εγχώρια και τη διεθνή βιβλιογραφία και στη συνέχεια παρατίθενται τα αποτελέσματα της έρευνάς μας: γίνεται προσπάθεια τυπολογικής κατηγοριοποίησης του διαδικτυακού υλικού, περιγραφή των χαρακτηριστικών του τόσο σε επίπεδο θεματολογίας όσο και δομής και, βέβαια, αξιολόγηση των ποιητικών ιστοσελίδων και ιστολογίων.
description: Taking as granted that, poetry, in a worldwide level, displays a steadily increasing and especially dynamic presence on the Internet, by exploiting in a creative way the possibilities of the mean, the present dissertation, focuses, in the case of Greece, on the attempt to record, classify and evaluate websites and blogs, which are relevant with poetic art. Initially, the theoretical framework of the thematic based on the native and universal bibliography unfolds , and subsequently, the results of our disquisition are cited: An attempt for typological categorization of the online material takes place, as also as a description of its features both in a thematological and structural level, and of course, evaluation of the poetic websites and blogs.
A Framework for Reasoning on Probabilistic Description Logics
Creators: name: Cota, Giuseppe
name: Zese, Riccardo
name: Bellodi, Elena
name: Lamma, Evelina
name: Riguzzi, Fabrizio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: While there exist several reasoners for Description Logics, very few of them can cope with uncertainty. BUNDLE is an inference framework that can exploit several OWL (non-probabilistic) reasoners to perform inference over Probabilistic Description Logics. In this chapter, we report the latest advances implemented in BUNDLE. In particular, BUNDLE can now interface with the reasoners of the TRILL system, thus providing a uniform method to execute probabilistic queries using different settings. BUNDLE can be easily extended and can be used either as a standalone desktop application or as a library in OWL API-based applications that need to reason over Probabilistic Description Logics. The reasoning performance heavily depends on the reasoner and method used to compute the probability. We provide a comparison of the different reasoning settings on several datasets.
SAR Tomography via Nonlinear Blind Scatterer Separation
Creators: name: Wang, Yuanyuan
name: Zhu, Xiao Xiang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Layover separation has been fundamental to many synthetic aperture radar applications, such as building reconstruction and biomass estimation. Retrieving the scattering profile along the mixed dimension (elevation) is typically solved by inversion of the SAR imaging model, a process known as SAR tomography. This paper proposes a nonlinear blind scatterer separation method to retrieve the phase centers of the layovered scatterers, avoiding the computationally expensive tomographic inversion. We demonstrate that conventional linear separation methods, e.g., principle component analysis (PCA), can only partially separate the scatterers under good conditions. These methods produce systematic phase bias in the retrieved scatterers due to the nonorthogonality of the scatterers' steering vectors, especially when the intensities of the sources are similar or the number of images is low. The proposed method artificially increases the dimensionality of the data using kernel PCA, hence mitigating the aforementioned limitations. In the processing, the proposed method sequentially deflates the covariance matrix using the estimate of the brightest scatterer from kernel PCA. Simulations demonstrate the superior performance of the proposed method over conventional PCA-based methods in various respects. Experiments using TerraSAR-X data show an improvement in height reconstruction accuracy by a factor of one to three, depending on the used number of looks.
description: This work has been accepted by IEEE TGRS for publication
On Sequential Estimation and Prediction for Discrete Time Series
Creators: name: Morvai, G.
name: Weiss, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Information Theory (cs.IT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: The problem of extracting as much information as possible from a sequence of observations of a stationary stochastic process $X_0,X_1,...X_n$ has been considered by many authors from different points of view. It has long been known through the work of D. Bailey that no universal estimator for $\textbf{P}(X_{n+1}|X_0,X_1,...X_n)$ can be found which converges to the true estimator almost surely. Despite this result, for restricted classes of processes, or for sequences of estimators along stopping times, universal estimators can be found. We present here a survey of some of the recent work that has been done along these lines.
Interplay between nematicity and Bardasis-Schrieffer modes in the short-time dynamics of unconventional superconductors
Creators: name: Müller, Marvin A.
name: Volkov, Pavel A.
name: Paul, Indranil
name: Eremin, Ilya M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by the recent experiments suggesting the importance of nematicity in the phase diagrams of ironbased and cuprate high-Tc superconductors, we study the influence of nematicity on the collective modes inside the superconducting state in a non-equilibrium. In particular, we consider the signatures of collective modes in short-time dynamics of a system with competing nematic and s- and d-wave superconducting orders. In the rotationally symmetric state, we show that the Bardasis-Schrieffer mode, corresponding to the subdominant pairing, hybridizes with the nematic collective mode and merges into a single in-gap mode, with the mixing vanishing only close to the phase boundaries. For the d-wave ground state, we find that nematic interaction suppresses the damping of the collective oscillations in the short-time dynamics. Additionally, we find that even inside the nematic s+d-wave superconducting state, a Bardasis-Schrieffer-like mode leads to order parameter oscillations that strongly depend on the competition between the two pairing symmetries. We discuss the connection of our results to the recent pump-probe experiments on high-Tc superconductors.
description: 12 pages, 8 figures
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Surpass
Creators: name: Perks, Graeme
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Surpass was built by Bernard Sherris on Scilly in 1846 and he was the first master. The Surpass sailed to the Mediterranean, South and North America, southern Africa and Mauritius. Edwin Sherris was the master of the Surpass from about 1852 until her sale in 1867. The registration of the Surpass was then moved from Falmouth to Grangemouth and the Surpass sailed between Scotland, Northeast England, London and Europe. The Surpass was sold again in 1873 and then sailed mainly between Liverpool, Europe, Wales and Ireland. In June 1876 on arriving at Porthmadog in ballast from Waterford the Surpass failed to answer the helm crossing the bar, went aground and sank. The crew used the ship's boat to reach the shore safely. The Surpass started to break up and was dismantled and sold.
Filamin cross-linked semiflexible networks: Fragility under strain
Creators: name: DiDonna, B. A.
name: Levine, Alex J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The semiflexible F-actin network of the cytoskeleton is cross-linked by a variety of proteins including filamin, which contain Ig-domains that unfold under applied tension. We examine a simple semiflexible network model cross-linked by such unfolding linkers that captures the main mechanical features of F-actin networks cross-linked by filamin proteins and show that under sufficiently high strain the network spontaneously self-organizes so that an appreciable fraction of the filamin cross-linkers are at the threshold of domain unfolding. We propose an explanation of this organization based on a mean-field model and suggest a qualitative experimental signature of this type of network reorganization under applied strain that may be observable in intracellular microrheology experiments of Crocker et al.
description: 4 Pages, 3 figures, Revtex4, submitted to PRL
Determining a vibrational distribution with a broadband optical source
Creators: name: Courageux, T.
name: Cournol, A.
name: Comparat, D.
name: de Lesegno, B. Viaris
name: Lignier, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: This work presents an experimental protocol conceived to determine the vibrational distribution of barium monofluoride molecules seeded in a supersonic beam of argon. Here, as in many cases, the detection signal is related to the number of molecules by an efficiency involving several parameters that may be difficult to determine properly. In particular, this efficiency depends on the vibrational level of the detected molecules. Our approach avoids these complications by comparing different detection signals generated by different vibrational excitations. Such an excitation is made possible by the use of a broadband optical source that depletes a specific vibrational level whose population is redistributed in the other levels.
description: 6 pages, 4 figures
Effect of dipolar moments in domain sizes of lipid bilayers and monolayers
Creators: name: Travesset, Alex
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Lipid domains are found in systems such as multi-component bilayer membranes and single component monolayers at the air-water interface. It was shown by Andelman et al. (Comptes Rendus 301, 675 (1985)) and McConnell et al. (Phys. Chem. {\bf 91}, 6417 (1987)) that in monolayers, the size of the domains results from balancing the line tension, which favors the formation of a large single circular domain, against the electrostatic cost of assembling the dipolar moments of the lipids. In this paper, we present an exact analytical expression for the electric potential, ion distribution and electrostatic free energy for different problems consisting of three different slabs with different dielectric constants and Debye lengths, with a circular homogeneous dipolar density in the middle slab. From these solutions, we extend the calculation of domain sizes for monolayers to include the effects of finite ionic strength, dielectric discontinuities (or image charges) and the polarizability of the dipoles and further generalize the calculations to account for domains in lipid bilayers. In monolayers, the size of the domains is dependent on the different dielectric constants but independent of ionic strength. In asymmetric bilayers, where the inner and outer leaflets have different dipolar densities, domains show a strong size dependence with ionic strength, with molecular-sized domains that grow to macroscopic phase separation with increasing ionic strength. We discuss the implications of the results for experiments and briefly consider their relation to other two dimensional systems such as Wigner crystals or heteroepitaxial growth.
description: 13 pages, 5 figues in eps Replaced with new version, one citation added and a few statements corrected. The results of the paper are unchanged
Restoration of Lorentz Invariance of 't Hooft-Polyakov Monopole Field
Creators: name: Qandalji, Khaled R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Lorentz invariance is broken for the non-Abelian monopoles. Here we will consider the case of 't Hooft-Polyakov monopole and show that the Lorentz invariance of its field will be restored using Dirac quantization.
Contexts in quantum, classical and partition logic
Creators: name: Svozil, Karl
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Contexts are maximal collections of co-measurable observables "bundled together" to form a "quasi-classical mini-universe." Different notions of contexts are discussed for classical, quantum and generalized urn-automaton systems.
description: Invited contribution to Handbook of Quantum Logic, edited by Kurt Engesser et al
Διαχείριση Δεξιοτήτων Εργαζομένων: Ανάπτυξη Διαδικτυακής Εφαρμογής και Πειραματική Ανάλυση Αλγορίθμου Κατάταξης
Creators: name: Χρόνη, Βασιλική Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Διαχείριση Δεξιοτήτων
Ανάπτυξη Διαδικτυακής Εφαρμογής
Ανάλυση Αλγορίθμου Κατάταξης
Competency Management
Development of Web Application
Analysis of Clustering Algorithm

description: Τα τελευταία χρόνια έχει γίνει μεγάλη προσπάθεια για την δημιουργία ενός υψηλού επιπέδου γνώσεων, την απόκτηση δεξιοτήτων και ικανοτήτων τα οποία θεωρούνται απαραίτητη προϋπόθεση για την συμμετοχή του ατόμου σε όλες τις πτυχές αυτής της σύγχρονης κοινωνίας όπως είναι η επαγγελματική ένταξη, ανταγωνιστικότητα και παραγωγικότητα. Ένα σημαντικό θέμα είναι ότι οι επιχειρήσεις χρειάζονται εργαζομένους με υψηλά επίπεδα δεξιοτήτων ώστε να μπορούν να είναι κερδοφόρες. Για να το επιτύχουν αυτό πολλές επιχειρήσεις και οργανισμοί ανέπτυξαν συστήματα Διαχείρισης Δεξιοτήτων (Competency Management Systems). Η παρούσα εργασία ασχολείται με την ανάπτυξη διαδικτυακής εφαρμογής αξιολόγησης δεξιοτήτων των εργαζομένων με βάση τις ζητούμενες δεξιότητες και τις πραγματικές δεξιότητες του κάθε εργαζομένου καθώς και με την ανάλυση ευαισθησίας του αλγορίθμου κατάταξης με πειραματικό τρόπο. Η δημιουργία της διαδικτυακής εφαρμογής που βασίζεται στη στατιστική γλώσσα R και η πειραματική ανάλυση στηρίχθηκαν στο θεωρητικό πλαίσιο και στα αποτελέσματα του Ευρωπαϊκού Ερευνητικού Έργου ComProfiTS (Competence Profiling Framework for IT Sector in Spain).
description: In recent years there has been much effort to create a high level of knowledge, skills and competence acquisition, in order a person to be able to participate in all aspects of modern society such as employability, competitiveness and productivity. An important issue that has emerged is that companies need employees with high levels of skills in order to be profitable. Towards this demand a lot of companies and organizations developed Competency Management Systems. The thesis presents the development of a web application for the competency assessment of employees based on the acquired and real competencies of every employee. Furthermore, we experimentally evaluate the sensitivity analysis of the clustering algorithm. The web application developed by using the R programming language for statistical computing. The development of the web applicational and the experimental analysis, are based on the theoretical framework and the results of the European Scientific Project ComProfiTS (Competence Profiling Framework for IT Sector in Spain).
One-loop corrections to the instanton transition in the Abelian Higgs model: Gel'fand-Yaglom and Green's function methods
Creators: name: Baacke, Jurgen
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The fluctuation determinant, the preexponential factor for the instanton transition, has been computed several years ago in the Abelian Higgs model, using a method based on integrating the Euclidean Green' function. A more elegant method for computing functional determinants, using the Gel'fand-Yaglom theorem, has been applied recently to a variety of systems. This method runs into difficulties if the background field has nontrivial topology, as is the case for the instanton in the Abelian Higgs model. A shift in thre effective centrifugal barriers makes the s-wave contribution infinite, an infinity that is compensated by the summation over the other partial waves. This requires some modifications of the Gel'fand-Yaglom method which are the main subject of this work. We present here both, the Green' s function and the Gel'fand-Yaglom method and compare the numerical results in detail.
description: 34 pages, 5 figures
The key to the grail is teaching with compassion
Creators: name: Sinclair, Tara
Publisher: name: University of British Columbia
Year: 2009

description: My purpose in undertaking this thesis was to explore, determine, and articulate my unexamined belief in the ontological humanity of compassion and thus its necessity for pedagogy. I read what authorities have written on the importance of being human in the world, personally, professionally, and pedagogically. These authoritiesnovelists, poets, researchers—are situated in the concreteness of lived subjectivity, lived intersubjectivity, and evoke a phenomenological description of being human in lived experience. I abstracted and re-lived, then self-consciously and concretely reflected upon, analyzed, wrote, and re-wrote poignant moments from my own life story as a teacher~in a dialectical process of separating, decontextualizing, confronting myself, as a teacher, in order to engage, involve, and ground myself as a compassionate teacher. I learned that compassion is the physical manifestation of the realization that we share the same Being; and thus it is part of all authentic human interaction. Without compassion, students cannot experience the feelings of acceptance necessary for self-esteem, necessary for realizing their best selves, as learners and as human beings. Without compassion, teachers cannot realize their best selves as human beings, to be their best selves as teachers. During my reading and writing, vivid experiential themes emerged that raised my consciousness from knowing the truth of the importance and significance of compassion in all human interaction intellectually to feeling the truth of it emotionally, spiritually, substantially. "And the end of all [my] exploring [Was] to arrive where [I] started And know the place for the first time." (Eliot, 1987, p. 2535) From authoring these reflections on my lived experience with my students, I realize profoundly my authorship in these and all such experiences. My lifeworld, now mediated by this realization, is deeply and forever enhanced and clarified by this realization. Henceforth, for me to live authentically, for my life to have meaning, I must be animated by and grounded in compassion in the life I live, and especially in the life I live with my students.
Οι ηθικές αρετές στον Αριστοτέλη
Creators: name: Χατζηκύρκου, Μαρία Ευάγγελου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ηθικές αρετές
Μεσότητα
Ψυχή
Moral virtues
Observance
Soul

description: Σκοπός της παρούσας εργασίας ήταν η μελέτη των αριστοτελικών αρετών στο πλαίσιο της αποκαλούμενης «μεσότητας». Εξετάσαμε τη σχέση της ηθικής και της πολιτικής, σύμφωνα με τον Αριστοτέλη, καθώς και την έννοια των αξιών, όπως την εννοεί ο φιλόσοφος. Στο κύριο μέρος της εργασίας παρουσιάσαμε αναλυτικά τα μέρη της ψυχής και την έννοια της αρετής. Ακόμη αναφερθήκαμε διεξοδικά στα δυο είδη των αρετών, στις διανοητικές και στις ηθικές. Ασχοληθήκαμε επιπλέον με την κάθε ηθική αρετή ξεχωριστά αφού περιγράψαμε τα βασικά χαρακτηριστικά της. Συγκεκριμένα, αναλύσαμε την ανδρεία, τη σωφροσύνη, την πραότητα, την ελευθεριότητα, τη μεγαλοπρέπεια, τη μεγαλοψυχία, την αρετή μεταξύ φιλοτιμίας-αφιλοτιμίας, την αλήθεια, την ευτραπελία, τη φιλία, την αιδώ, τη νέμεση και τη δικαιοσύνη.
description: The aim of the present thesis was the study of Aristotel’s virtue in the area of what is known as “observance”. We examined the relation between ethics and politics, according to Aristoteles, as well as the mean of values. In the main part of this thesis we presented in detail the parts of soul and the meaning of virtue. In addition, we examined the two kinds of virtue, the mental and moral virtue. Finally, we analysed each moral virtue thoroughly, after we described its main characteristics – features in every detail. In particular, we analysed courage, temperance, gentlessness ( or good temper ), liberality, magnificence, greatness of soul, virtue between ambition and unambitiousness, truthfulness, wittiness, friendship, modesty, nemesis and justice.
A Continuum Manipulator for Open-Source Surgical Robotics Research and Shared Development
Creators: name: Clark, Angus B.
name: Mathivannan, Visakan
name: Rojas, Nicolas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Many have explored the application of continuum robot manipulators for minimally invasive surgery, and have successfully demonstrated the advantages their flexible design provides -- with some solutions having reached commercialisation and clinical practice. However, the usual high complexity and closed-nature of such designs has traditionally restricted the shared development of continuum robots across the research area, thus impacting further progress and the solution of open challenges. In order to close this gap, this paper introduces ENDO, an open-source 3-segment continuum robot manipulator with control and actuation mechanism, whose focus is on simplicity, affordability, and accessibility. This robotic system is fabricated from low cost off-the-shelf components and rapid prototyping methods, and its information for implementation (and that of future iterations), including CAD files and source code, is available to the public on the Open Source Medical Robots initiative's repository on GitHub (https://github.com/OpenSourceMedicalRobots), with the control library also available directly from Arduino. Herein, we present details of the robot design and control, validate functionality by experimentally evaluating its workspace, and discuss possible paths for future development.
description: 4 pages, 6 figures
МОЛЧАНИЕ ‒ ПРАГМАЛИГВИСТИЧЕСКИЙ ФЕНОМЕН
Creators: name: Дилрабо Келдиёровна Бахронова, профессор Узбекского государственного университета мировых языков, доктор филологических наук
name: Дилором Нигматовна Юлдашева, профессор кафедры узбекского языкознания и журналистики Бухарского государственного университета, кандидат педагогических наук
Publisher: name: Zenodo
Year: 2024

description: Лингвокогнитология как относительно новое направление современного языкознания стала изучать когнитивные свойства языковых и неязыковых единиц. Исходя из общности национального языка и национального мышления, рассмотрение когнитивных, экспрессивных, аккумулятивных сторон каждого языкового явления считается одной из основных задач этого направления. Ведь важно анализировать каждый язык в совокупности таких факторов, как социальная среда, национальный менталитет, национальный этикет, а также речь и культура носителя этого языка. В данной статье анализируется вопрос подхода к феномену молчания, являющемуся компонентом дискурса, как единице действия внутренней и внешней речи в процессе речевого общения.

Ключевые слова: антропоцентрическая парадигма, речевое общение, внутренняя речь, внешняя речь, невербальные средства, молчание в речевом общении
Good product expansions for tame elements of reductive p-adic groups
Creators: name: Adler, Jeffrey D.
name: Spice, Loren
Publisher: name: arXiv
Year: 2006
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 20G25, 22E35 (Primary) 22E50 (Secondary)

description: We show that, under fairly general conditions, many elements of a p-adic group can be well approximated by a product whose factors have properties that are helpful in performing explicit character computations.
description: 88 pages; minor errors corrected; results renumbered to match published version
Gravity Dual of Gauge Theory on S^2 x S^1 x R
Creators: name: Copsey, Keith
name: Horowitz, Gary T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We (numerically) construct new static, asymptotically AdS solutions where the conformal infinity is the product of time and S^2 x S^1. There always exist a family of solutions in which the S^1 is not contractible and, for small S^1, there are two additional families of solutions in which the S^1 smoothly pinches off. This shows that (when fermions are antiperiodic around the S^1) there is a quantum phase transition in the gauge theory as one decreases the radius of the S^1 relative to the S^2. We also compare the masses of our solutions and argue that the one with lowest mass should minimize the energy among all solutions with conformal boundary S^2 x S^1 x R. This provides a new positive energy conjecture for asymptotically locally AdS metrics. A simple analytic continuation produces AdS black holes with topology S^2 x S^1.
description: 17 pages, 4 figures, v2: minor changes, added references
Αντιρατσιστική νομοθεσία στην Ελλάδα: Ν 927/1979 και η αντικατάστασή του από το Ν 4285/2014
Creators: name: Γκαμπέτα, Ελένη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ρατσισμός
Ξενοφοβία
Αντιρατσιστική νομοθεσία
Racism
Xenophobia
Antiracist Legislation

description: Η παρούσα εργασία πραγματεύεται τα νομικά εργαλεία της Ελλάδος απέναντι στον ρατσισμό και στην ξενοφοβία. Αρχικά, για την καλύτερη κατανόηση του φαινομένου και των διαστάσεων που αυτό έχει πάρει, ερμηνεύονται βασικές έννοιες που συγκροτούν τον ρατσισμό και γίνεται μια σύντομη ιστορικοκοινωνική ανάλυσή του. Σε επίπεδο νομοθεσίας, ύστερα από την αναφορά σε νομοθετικά μέτρα που έχουν επιστρατευτεί για την αντιμετώπισή του σε διεθνές και ευρωπαϊκό επίπεδο, καθώς και σε νομοθετήματα ξένων χωρών που από νωρίς κινήθηκαν προς αυτήν την κατεύθυνση, λαμβάνει χώρα στο κύριο μέρος της εργασίας το νομικό οπλοστάσιο της Ελλάδας απέναντι στον ρατσισμό και στην ξενοφοβία. Συγκεκριμένα, την παράθεση των σημαντικότερων ελληνικών αντιρατσιστικών νομοθετικών κειμένων ακολουθεί μια εκτενής ανάλυση του Ν 927/1979 και των περιπτώσεως που αυτός έτυχε εφαρμογής. Σημαντικό μέρος της εργασίας αποτελούν και οι προβληματισμοί για τη σύγκρουση αυτού του νόμου με συνταγματικά κατοχυρωμένες ελευθερίες, όπως την ελευθερία της έκφρασης και παράλληλα προτείνονται τρόποι άρσης της σύγκρουσης. Περεταίρω, αναφέρεται ιδιαιτέρως ο νόμος 3304/2005 και η επιβαρυντική περίσταση του α. 79ΠΚ, ενώ στο τέλος εξετάζεται η Απόφαση Πλαίσιο 2008/913 του Συμβουλίου και πως αυτή μπορεί να ενσωματωθεί στο ελληνικό δίκαιο. Μετά την ολοκλήρωση συγγραφής της εργασίας ψηφίστηκε από τη Βουλή ο Ν 4285/2014, ο οποίος αντικατέστησε τον Ν 927/1979. Ως εκ τούτου για λόγους συμμόρφωσης με την επικαιρότητα προστέθηκε ειδικό κεφάλαιο, στο οποίο αναλύεται ο νέος νόμος και αντιπαραβάλλεται με το παλαιό καθεστώς.
description: The present study deals with the legal tools of Greece against racism and xenophobia. Firstly, I have interpreted key concepts, that constitute racism, and a short historical and social analysis is carried out for a better understanding of the dimensions of this phenomenon. As regards legislation, following the reference to legislative measures against racism at international and European level as well as in foreign countries legislation that early initiated in this direction, I examined in the main part of this study the legal “arsenal” of Greece against racism and xenophobia. Specifically, the major Greek anti-racist legislation follows a comprehensive analysis of Law 927/1979 and the case that it was applied. The conflict between this law and constitutional freedom, such as freedom of expression, is an important part of this study. Further, it is the Law 3304/2005 and the aggravating circumstance of a. 79 of Penal Code, that are particularly referred, while at the end I analyzed the Framework Decision 2008/913 Council and how it can be incorporated into Greek law. When this study has been ready, the L. 4285/2014 was voted by Greek Parliament, which replaced the Law 927/1979 and therefore I added a chapter and analyzed the new law in contrast with the old law.
Elastic Cherenkov effects in transversely isotropic soft materials-I: Theoretical analysis, simulations and inverse method
Creators: name: Li, Guo-Yang
name: Zheng, Yang
name: Liu, Yanlin
name: Destrade, Michel
name: Cao, Yanping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A body force concentrated at a point and moving at a high speed can induce shear-wave Mach cones in dusty-plasma crystals or soft materials, as observed experimentally and named the elastic Cherenkov effect (ECE). The ECE in soft materials forms the basis of the supersonic shear imaging (SSI) technique, an ultrasound-based dynamic elastography method applied in clinics in recent years. Previous studies on the ECE in soft materials have focused on isotropic material models. In this paper, we investigate the existence and key features of the ECE in anisotropic soft media, by using both theoretical analysis and finite element (FE) simulations, and we apply the results to the non=invasive and non-destructive characterization of biological soft tissues. We also theoretically study the characteristics of the shear waves induced in a deformed hyperelastic anisotropic soft material by a source moving with high speed, considering that contact between the ultrasound probe and the soft tissue may lead to finite deformation. On the basis of our theoretical analysis and numerical simulations, we propose an inverse approach to infer both the anisotropic and hyperelastic parameters of incompressible transversely isotropic (TI) soft materials. Finally, we investigate the properties of the solutions to the inverse problem by deriving the condition numbers in analytical form and performing numerical experiments. In Part II of the paper, both ex vivo and in vivo experiments are conducted to demonstrate the applicability of the inverse method in practical use.
Optimal control of geometric partial differential equations
Creators: name: Hintermüller, Michael
name: Keil, Tobias
Publisher: name: Weierstrass Institute
Year: 2019
Subjects: subject: Adaptive discretization
subject: constraint degeneracy
subject: diffuse interface model
subject: electro-wetting on dielectric
subject: geometric evolution
subject: mathematical program with equilibrium constraints
subject: multiphase fluids
subject: numerical method
subject: optimal control
subject: sharp interface model
subject: C stationarity conditions
subject: 49J20
subject: 49K20
subject: 35J87
subject: 35Q93
subject: 35Q35
subject: 35R35
subject: 90C33
subject: 90C46
subject: 76D45
subject: 76T10
subject: 65K10
subject: 65K15

description: Optimal control problems for geometric (evolutionary) partial differential inclusions are considered. The focus is on problems which, in addition to the nonlinearity due to geometric evolution, contain optimization theoretic challenges because of non-smoothness. The latter might stem from energies containing non-smooth constituents such as obstacle-type potentials or terms modeling, e.g., pinning phenomena in microfluidics. Several techniques to remedy the resulting constraint degeneracy when deriving stationarity conditions are presented. A particular focus is on Yosida-type mollifications approximating the original degenerate problem by a sequence of nondegenerate nonconvex optimal control problems. This technique is also the starting point for the development of numerical solution schemes. In this context, also dual-weighted residual based error estimates are addressed to facilitate an adaptive mesh refinement. Concerning the underlying state model, sharp and diffuse interface formulations are discussed. While the former always allows for accurately tracing interfacial motion, the latter model may be dictated by the underlying physical phenomenon, where near the interface mixed phases may exist, but it may also be used as an approximate model for (sharp) interface motion. In view of the latter, (sharp interface) limits of diffuse interface models are addressed. For the sake of presentation, this exposition confines itself to phase field type diffuse interface models and, moreover, develops the optimal control of either of the two interface models along model applications. More precisely, electro-wetting on dielectric is used in the sharp interface context, and the control of multiphase fluids involving spinodal decomposition highlights the phase field technique. Mathematically, the former leads to a Hele-Shaw flow with geometric boundary conditions involving a complementarity system due to contact line pinning, and the latter gives rise to a Cahn-Hilliard Navier-Stokes model including a non-smooth obstacle type potential leading to a variational inequality constraint.
Travel time prediction for congested freeways with a dynamic linear model
Creators: name: Kwak, Semin
name: Geroliminis, Nikolas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Accurate prediction of travel time is an essential feature to support Intelligent Transportation Systems (ITS). The non-linearity of traffic states, however, makes this prediction a challenging task. Here we propose to use dynamic linear models (DLMs) to approximate the non-linear traffic states. Unlike a static linear regression model, the DLMs assume that their parameters are changing across time. We design a DLM with model parameters defined at each time unit to describe the spatio-temporal characteristics of time-series traffic data. Based on our DLM and its model parameters analytically trained using historical data, we suggest an optimal linear predictor in the minimum mean square error (MMSE) sense. We compare our prediction accuracy of travel time for freeways in California (I210-E and I5-S) under highly congested traffic conditions with those of other methods: the instantaneous travel time, k-nearest neighbor, support vector regression, and artificial neural network. We show significant improvements in the accuracy, especially for short-term prediction.
description: in IEEE Transactions on Intelligent Transportation Systems, 2020