cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Extreme nonreciprocity in metasurfaces based on bound states in the continuum
Creators: name: Máñez-Espina, Luis Manuel
name: Faniayeu, Ihar
name: Asadchy, Viktar
name: Díaz-Rubio, Ana
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Nonreciprocal devices, including optical isolators, phase shifters, and amplifiers, are pivotal for advanced optical systems. However, exploiting natural materials is challenging due to their weak magneto-optical effects, requiring substantial thickness to construct effective optical devices. In this study, we demonstrate that subwavelength metasurfaces supporting bound states in the continuum and made of conventional magnetic ferrite can exhibit extreme nonreciprocity in the Faraday configuration and near-unity magnetic circular dichroism. These metasurfaces enhance the magneto-optical effect by 3--4 orders of magnitude compared to a continuous film of the same material. This significant enhancement is achieved by leveraging Huygens' condition in the metasurface whose structural units support paired electric and magnetic dipole resonances. We develop the multi-mode temporal coupled-mode theory for the observed enhancement of the magneto-optical effect and confirm our findings with the full-wave simulations.
Supplementary document for High extinction ratio and ultra-broadband polarization beam splitter in silicon Integrated photonics by employing all-dielectric metamaterial cladding - 6124327.pdf
Creators: name: Debevc, Andraz
name: Topic, Marko
name: Krc, Janez
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: Uncategorized

description: Supplemental document
Determination of an organophosphate pesticide using antibody immobilised hybrid nanocomposites
Creators: name: Kaur, Navpreet
name: Bhatnagar, Archana
name: Bhalla, Aman
name: Prabhakar, Nirmal
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Space Science
subject: Medicine
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Plant Biology

description: In this study, the malathion specific polyclonal antibodies (Abs) were raised for the fabrication of an electrochemical immunosensor using poly (3,4-ethylenedioxythiophene) (PEDOT) and carboxylated multiwalled carbon nanotubes (c-MWCNTs) nanocomposites. The conjugation of hapten (malathion diacid) with bovine serum albumin (BSA) through N-hydroxysuccinimide (NHS) ester method was optimised for the generation of Abs. New Zealand White (NZW) male rabbits were immunised subcutaneously for the development of Abs followed by characterisation and purification. The purified Abs were covalently immobilised on nanocomposites deposited onto fluorine tin oxide (FTO). Based on immunoreaction between malathion and anti-malathion Abs, the DPV peak current was found to be inversely proportional to increase in malathion concentration. The detection limit was 1.1 fM under all the optimised experimental parameters. The immunosensor was found to be specific as low current response was observed for malathion only in comparison to other interferents. Malathion recoveries from the spiked sample were found to be superior via immunosensor than HPLC.
Serre weights for locally reducible two-dimensional Galois representations
Creators: name: Diamond, Fred
name: Savitt, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F80

description: Let F be a totally real field, and v a place of F dividing an odd prime p. We study the weight part of Serre's conjecture for continuous, totally odd, two-dimensional mod p representations rhobar of the absolute Galois group of F that are reducible locally at v. Let W be the set of predicted Serre weights for the semisimplification of rhobar restricted to the decomposition group at v. We prove that when the local representation is generic, the Serre weights in W for which rhobar is modular are exactly the ones that are predicted (assuming that rhobar is modular). We also determine precisely which subsets of W arise as predicted weights when the local representation varies with fixed generic semisimplification.
description: 30 pages, to appear in Journal of the Institute of Mathematics of Jussieu
Open Problem: Learning with Variational Objectives on Measures
Creators: name: Cabannes, Vivien
name: Domingo-Enrich, Carles
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: I.2.6; F.2.2; G.3
subject: 68T05

description: The theory of statistical learning has focused on variational objectives expressed on functions. In this note, we discuss motivations to write similar objectives on measures, in particular to discuss out-of-distribution generalization and weakly-supervised learning. It raises a natural question: can one cast usual statistical learning results to objectives expressed on measures? Does the resulting construction lead to new algorithms of practical interest?
[Gymnasium 105,1998, Heft 2 / Mitteilungsblatt des Landesverbands NRW (46,1998, Heft 1) / SCRINIUM. Alte Sprachen in Rheinland-Pfalz und im Saarland (Doppelheft 42,1997, Heft 3/ 43, 1998, Heft 1) …]
Creators: name: Rabl, Josef
Publisher: name: Forum Classicum
Year: 2017

description: -
description: Forum Classicum, Nr. 2 (1998): Forum Classicum
Preparation and characterisation of polypyrrole – carbon nanomaterial composite solid-phase microextraction fibres and their applications to the determination of fungicide residues in grape juice samples
Creators: name: Kirlangiç, Irem Aydin
name: Afacan, Imran Güney
name: Pelit, Levent
name: Ertaş, Hasan
name: Ertaş, F. Nil
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified

description: Present study describes the use of a lab-made polypyrrole (PPy) coated solid phase microextraction (SPME) fibres modified with carbonaceous nanomaterials for effective adsorption of volatile fungicides used in vineyards for subsequent determination by gas chromatography coupled with a mass spectrometer. The SPME fibres were fabricated electrochemically by dipping a stainless steel wire in a cell containing pyrrole monomer where the polymeric film was coated on the wire by cycling the potential between −0.5 and 2.0 V at a rate of 50 mV s−1. Then, the procedure was repeated in the presence of multi-walled carbon nanotubes (MWCNTs) or graphene (Gr) nanoplates dispersed in tartrate solution. The coated fibres were attached to a holder for subsequent headspace extraction of volatile fungicides in grape juice samples. Initial studies were conducted with commercial fibres adoptable to a fully automated system and optimal conditions were studied by using an 85 µm PA fibre. Then, the fabricated fibres have been tested manually under optimised conditions for unbiased comparison. Overall results have suggested that PPy-MWCNT-SPME and PPy-Gr-SPME have given the comparable results with commercial fibres in the concentration range of 1.0–50 ng mL−1 by allowing the determination of these fungicides at LOQ levels varied in the range of 0.55–6.94 ng mL−1 ranges. In comparison to the literature values, more results that are sensitive were obtained with these two fibres with satisfactory recovery values without any solvent consumption or labour-intensive pre-treatment processes.
State Preparation in a Jaynes-Cummings Lattice with Quantum Optimal Control
Creators: name: Parajuli, Prabin
name: Govindarajan, Anuvetha
name: Tian, Lin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: High-fidelity preparation of quantum states in an interacting many-body system is often hindered by the lack of knowledge of such states and by limited decoherence times. Here we study a quantum optimal control (QOC) approach for fast generation of quantum ground states in a finite-sized Jaynes-Cummings lattice with unit filling. Our result shows that the QOC approach can generate quantum many-body states with high fidelity when the evolution time is above a threshold time, and it can significantly outperform the adiabatic approach. We study the dependence of the threshold time on the parameter constraints and the connection of the threshold time with the quantum speed limit. We also show that the QOC approach can be robust against control errors. Our result can lead to advances in the application of the QOC for many-body state preparation.
description: 10 pages, 6 figures, published
Residual-Based Error Corrector Operator to Enhance Accuracy and Reliability of Neural Operator Surrogates of Nonlinear Variational Boundary-Value Problems
Creators: name: Jha, Prashant K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: Machine Learning (cs.LG)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 65N22, 65N30, 62M45

description: This work focuses on developing methods for approximating the solution operators of a class of parametric partial differential equations via neural operators. Neural operators have several challenges, including the issue of generating appropriate training data, cost-accuracy trade-offs, and nontrivial hyperparameter tuning. The unpredictability of the accuracy of neural operators impacts their applications in downstream problems of inference, optimization, and control. A framework based on the linear variational problem that gives the correction to the prediction furnished by neural operators is considered based on earlier work in JCP 486 (2023) 112104. The operator, called Residual-based Error Corrector Operator or simply Corrector Operator, associated with the corrector problem is analyzed further. Numerical results involving a nonlinear reaction-diffusion model in two dimensions with PCANet-type neural operators show almost two orders of increase in the accuracy of approximations when neural operators are corrected using the correction scheme. Further, topology optimization involving a nonlinear reaction-diffusion model is considered to highlight the limitations of neural operators and the efficacy of the correction scheme. Optimizers with neural operator surrogates are seen to make significant errors (as high as 80 percent). However, the errors are much lower (below 7 percent) when neural operators are corrected.
description: 36 pages, 14 figures, 3 tables
Neblung, Dagmar: Die Gestalt der Kassandra in der antiken Literatur
Creators: name: Wölke, Hansjörg
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Neblung, Dagmar: Die Gestalt der Kassandra in der antiken Literatur. Stuttgart u. Leipzig: Teubner 1997 (Beiträge zur Altertumskunde. Bd 97). IX, 271 S., 98,00 DM (ISBN3-519-07646-2).
description: Forum Classicum, Nr. 2 (1998): Forum Classicum
Rigorous derivation of the Efimov effect in a simple model
Creators: name: Fermi, Davide
name: Ferretti, Daniele
name: Teta, Alessandro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 81Q10, 81Q15, 70F07, 46N50

description: We consider a system of three identical bosons in $\mathbb{R}^3$ with two-body zero-range interactions and a three-body hard-core repulsion of a given radius $a>0$. Using a quadratic form approach we prove that the corresponding Hamiltonian is self-adjoint and bounded from below for any value of $a$. In particular this means that the hard-core repulsion is sufficient to prevent the fall to the center phenomenon found by Minlos and Faddeev in their seminal work on the three-body problem in 1961. Furthermore, in the case of infinite two-body scattering length, also known as unitary limit, we prove the Efimov effect, \emph{i.e.}, we show that the Hamiltonian has an infinite sequence of negative eigenvalues $E_n$ accumulating at zero and fulfilling the asymptotic geometrical law $\;E_{n+1} / E_n \; \to \; e^{-\frac{2π}{s_0}}\,\; \,\text{for} \,\; n\to +\infty$ holds, where $s_0\approx 1.00624$.
description: 27 pages
Hyperscaling violation in the 2D 8-state Potts model with long-range correlated disorder
Creators: name: Chatelain, Christophe
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The first-order phase transition of the two-dimensional eight-state Potts model is shown to be rounded when long-range correlated disorder is coupled to energy density. Critical exponents are estimated by means of large-scale Monte Carlo simulations. In contrast to uncorrelated disorder, a violation of the hyperscaling relation $γ/ν=d-2x_σ$ is observed. Even though the system is not frustrated, disorder fluctuations are strong enough to cause this violation in the very same way as in the 3D random-field Ising model. In the thermal sector too, evidence is given for such violation in the two hyperscaling relations $α/ν=d-2x_\varepsilon$ and $1/ν=d-x_\varepsilon$. In contrast to the random field Ising model, at least two hyperscaling violation exponents are needed. The scaling dimension of energy is conjectured to be $x_\varepsilon=a/2$, where $a$ is the exponent of the algebraic decay of disorder correlations.
description: 6 pages, 6 figures. Published version
title: Χαρτογράφηση των χωρικών μεταβολών των εντάσεων της οπισθοσκεδασμένης ακτινοβολίας ως νέο διαγνωστικό κριτήριο για την ανίχνευση της επιθηλιακής νεοπλασίας
Creators: name: Πολογιώργη Ιφιγένεια
Publisher: name: Technical University of Crete
Year: 2010

description: Μη διαθέσιμο
Variational principle to regularize machine-learned density functionals: the non-interacting kinetic-energy functional
Creators: name: del Mazo-Sevillano, P.
name: Hermann, J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Machine Learning (cs.LG)
subject: Computational Physics (physics.comp-ph)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Practical density functional theory (DFT) owes its success to the groundbreaking work of Kohn and Sham that introduced the exact calculation of the non-interacting kinetic energy of the electrons using an auxiliary mean-field system. However, the full power of DFT will not be unleashed until the exact relationship between the electron density and the non-interacting kinetic energy is found. Various attempts have been made to approximate this functional, similar to the exchange--correlation functional, with much less success due to the larger contribution of kinetic energy and its more non-local nature. In this work we propose a new and efficient regularization method to train density functionals based on deep neural networks, with particular interest in the kinetic-energy functional. The method is tested on (effectively) one-dimensional systems, including the hydrogen chain, non-interacting electrons, and atoms of the first two periods, with excellent results. For the atomic systems, the generalizability of the regularization method is demonstrated by training also an exchange--correlation functional, and the contrasting nature of the two functionals is discussed from a machine-learning perspective.
Scalar induced gravitational waves in light of Pulsar Timing Array data
Creators: name: Yi, Zhu
name: Gao, Qing
name: Gong, Yungui
name: Wang, Yue
name: Zhang, Fengge
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The power-law parametrization for the energy density spectrum of gravitational wave (GW) background is a useful tool to study its physics and origin. While scalar induced secondary gravitational waves (SIGWs) from some particular models fit the signal detected by NANOGrav, Parkers Pulsar Timing Array, European Pulsar Timing Array, and Chinese Pulsar Timing Array collaborations better than GWs from supermassive black hole binaries (SMBHBs), we test the consistency of the data with the infrared part of SIGWs which is somewhat independent of models. Through Bayesian analysis, we show that the infrared parts of SIGWs fit the data better than GW background from SMBHBs. The results give tentative evidence for SIGWs.
description: 28 pages, 4 figures, Updated to match published version
Supplementary document for Photo-induced Temperature in Optical Interference Coatings - 6126139.pdf
Creators: name: Rouquette, Paul
name: Amra, Claude
name: Zerrad, Myriam
name: GREZES-BESSET, Catherine
name: KROL, Hélène
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: Uncategorized

description: Supplement 1
β-function for the Higgs self-interaction in the Standard Model at three-loop level
Creators: name: Chetyrkin, K. G.
name: Zoller, M. F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analytically compute the QCD, electroweak, Higgs and third generation Yukawa contributions to the β-function for the Higgs self-coupling as well as for the Higgs mass parameter in the unbroken phase of the Standard Model at three-loop level.
description: v2: minor improvements, references added v3: A bug in the numerical analysis is corrected, which changes some terms in Eqs. (3.6), (3.7), (3.9) and (3.10). The overall effect of these terms to the evolution of the Higgs quartic coupling at large scales remains small. The analytical results stay untouched. Three figures are added
Modeling language ideologies for the dynamics of languages in contact
Creators: name: Rosillo-Rodes, Pablo
name: Miguel, Maxi San
name: Sanchez, David
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In multilingual societies, it is common to encounter different language varieties. Various approaches have been proposed to discuss different mechanisms of language shift. However, current models exploring language shift in languages in contact often overlook the influence of language ideologies. Language ideologies play a crucial role in understanding language usage within a cultural community, encompassing shared beliefs, assumptions, and feelings towards specific language forms. These ideologies shed light on the social perceptions of different language varieties expressed as language attitudes. In this study, we introduce an approach that incorporates language ideologies into a model for contact varieties by considering speaker preferences as a parameter. Our findings highlight the significance of preference in language shift, which can even outweigh the influence of language prestige associated, for example, with a standard variety. Furthermore, we investigate the impact of the degree of interaction between individuals holding opposing preferences on the language shift process. Quite expectedly, our results indicate that when communities with different preferences mix, the coexistence of language varieties becomes less likely. However, variations in the degree of interaction between individuals with contrary preferences notably lead to non-trivial transitions from states of coexistence of varieties to the extinction of a given variety, followed by a return to coexistence, ultimately culminating in the dominance of the previously extinct variety. By studying finite-size effects, we observe that the duration of coexistence states increases exponentially with network size. Ultimately, our work constitutes a quantitative approach to the study of language ideologies in sociolinguistics.
description: 18 pages, 15 figures
Anna Elissa Radke: Ars paedagogica - Erziehungskunst, lateinisch-deutsche Gedichte und Prosatexte für Schüler, Lehrer und Unterricht
Creators: name: Fritsch, Andreas
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Anna Elissa Radke: Ars paedagogica - Erziehungskunst, lateinisch-deutsche Gedichte und Prosatexte für Schüler, Lehrer und Unterricht. Würzburg: Verlag Königshausen & Neumann. 280 Seiten. ISBN 3-8260-1534-7.
description: Forum Classicum, Nr. 2 (1998): Forum Classicum
First-order Phase Transition interpretation of PTA signal produces solar-mass Black Holes
Creators: name: Gouttenoire, Yann
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We perform a Bayesian analysis of NANOGrav 15yr and IPTA DR2 pulsar timing residuals and show that the recently detected stochastic gravitational-wave background (SGWB) is compatible with a SGWB produced by bubble dynamics during a cosmological first-order phase transition. The timing data suggests that the phase transition would occur around QCD confinement temperature and would have a slow rate of completion. This scenario can naturally lead to the abundant production of primordial black holes (PBHs) with solar masses. These PBHs can potentially be detected by current and advanced gravitational wave detectors LIGO-Virgo-Kagra, Einstein Telescope, Cosmic Explorer, by astrometry with GAIA and by 21-cm survey.
description: Published in PRL
Physicochemical and spectral evaluation of the interactional behavior of nicotinic acid (vitamin B3) with mixed [sodium deoxycholate (bile salt) + cetyltrimethylammonium bromide] surfactants
Creators: name: Banipal, Parampaul K.
name: Sohal, Pallavi
name: Banipal, Tarlok S.
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine

description: Aggregation behavior of anionic bio-surfactant; sodium deoxycholate (SDC) and cationic surfactant; cetyltrimethylammonium bromide (CTAB) and their mixtures at different mole fractions, αSDC = (0.90026, 0.88416, and 0.69438) has been examined in water as well as in aqueous solutions of nicotinic acid at (298.15, 308.15, and 318.15) K by employing various techniques such as conductivity, density, sound velocity, UV–visible spectroscopy, and dynamic light scattering (DLS) studies. From the critical micelle concentration (CMC) and the degree of ionization (α) of micelle, thermodynamic parameters {standard Gibbs free energy (ΔGm°), enthalpy (ΔHm°), and entropy (ΔSm°) of micellization} have been evaluated and analyzed for surfactants studied in water and in (1, 2, and 3) × 10−4 mol kg−1 nicotinic acid(aq) solutions at (298.15, 308.15, and 318.15) K. The CMC values for both the pure and mixed (SDC + CTAB) surfactants were found to increase with increase in concentration of nicotinic acid. The partial specific volume (φv), isentropic compressibility (κs), and partial specific isentropic compressibility (φκ) were estimated from density and speed of sound data. UV–vis absorption spectra of 1 × 10−4 mol kg−1 nicotinic acid(aq) solutions were also recorded in presence of surfactants studied at αSDC = (0.90026, 0.88416, 0.69438) and T = 298.15 K. Hydrodynamic diameters (Dh) of micellar aggregates for both pure and mixed surfactants were analyzed through the DLS studies performed at 298.15 K. The results from all the studies suggest the supremacy of both hydrophobic and electrostatic interactions between the nicotinic acid and the mixed micellar aggregates.
Folding defect affine Toda field theories
Creators: name: Robertson, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A folding process is applied to fused a^(1)_r defects to construct defects for the non-simply laced affine Toda field theories of c^(1)_n, d^(2)_n and a^(2)_2n at the classical level. Support for the hypothesis that these defects are integrable in the folded theories is provided by the observation that transmitted solitons retain their form. Further support is given by the demonstration that energy and momentum are conserved.
description: Shortened. 5 figures, 1 table. References added
Christoph Lüth, Rudolf W. Keck und Erhard Wiersing (Hg.): Der Umgang mit dem Fremden in der Vormoderne. Studien zur Akkulturation in bildungstheoretischer Sicht
Creators: name: Fritsch, Andreas
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Christoph Lüth, Rudolf W. Keck und Erhard Wiersing (Hg.): Der Umgang mit dem Fremden in der Vormoderne. Studien zur Akkulturation in bildungstheoretischer Sicht. Böhlau Verlag Köln, Weimar, Wien 1997 (Beiträge zur Historischen Bildungsforschung, Bd. 17), 293 Seiten, DM 68,- (ISBN 3-412-07396-2).
description: Forum Classicum, Nr. 2 (1998): Forum Classicum
title: Ανάπτυξη ηλεκτρονικού συστήματος διαχείρισης ενέργειας διάφανων φωτοβολταϊκών πλαισίων
title: Development of an electronic energy management system for transparent photovoltaic modules
Creators: name: Κιτσακης Δημητριος
Publisher: name: Technical University of Crete
Year: 2017

description: Ένας πρόσφατος προσανατολισμός της φωτοβολταϊκής τεχνολογίας είναι η ανάπτυξη διάφανων φωτοβολταϊκών στοιχείων που μπορούν να χρησιμοποιηθούν ως δομικά στοιχεία σε κτίρια, αντικαθιστώντας γυάλινες ή άλλες διάφανες επιφάνειες. Σε αυτή τη διπλωματική εργασία μελετήθηκε η λειτουργία ενός εμπορικά διαθέσιμου διάφανου φωτοβολταϊκού πλαισίου τύπου Dye-Sensitized. Σκοπός της εργασίας ήταν η ανάλυση της λειτουργίας αυτού του πλαισίου σε διάφορες συνθήκες προσπίπτουσας ηλιακής ακτινοβολίας, σκίασης και θερμοκρασίας, καθώς και η ανάπτυξη ενός ηλεκτρονικού συστήματος που θα το οδηγεί στη βέλτιστη ενεργειακή απόδοση. Το τελικό σύστημα αποτελείται από έναν μετατροπέα DC/DC και έναν μικροελεγκτή. Επίσης, υλοποιήθηκαν δύο εναλλακτικοί αλγόριθμοι ελέγχου λειτουργίας του φωτοβολταϊκού πλαισίου, που το οδηγούν στο σημείο μέγιστης παραγωγής ισχύος. Τα πειραματικά αποτελέσματα επιβεβαίωσαν ότι με το σύστημα που αναπτύχθηκε μεγιστοποιείται η παραγωγή ενέργειας του Dye-Sensitized φωτοβολταϊκού πλαισίου τόσο κατά την ομοιόμορφη πρόσπτωση ηλιακής ακτινοβολίας, όσο και σε συνθήκες μερικής σκίασης.
Atmospheric muons at PeV energies in radio neutrino detectors
Creators: name: Pyras, Lilly
name: Glaser, Christian
name: Hallmann, Steffen
name: Nelles, Anna
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Experiments seeking to detect radio emission stemming from neutrino interactions will soon reach sensitivities that bring a detection within reach. Since experiments like RNO-G or the future IceCube-Gen2 target more than an order of magnitude more effective volume than existing experiments, the renewed and detailed study of rare backgrounds is needed. In this paper, we study the potential background from energy losses of highly energetic atmospheric muons. Due to both limited experimental measurements and limited modeling in hadronic interaction models, the expected event rate is subject to large uncertainties. Here, we estimate rate predictions and their uncertainties for different models and instrumental parameters. We also study possible routes towards mitigation of the muon background, such as parent air shower detection, and illustrate what is needed to make the first measurement of the prompt muon flux at energies above 10 PeV.
description: 19 pages, 14 figures plus references and appendix, v3 includes minor changes requested by peer review
title: Υλοποίηση DIFT στον επεξεργαστή MIPS για την αντιμετώπιση κακόβουλων επιθέσεων
title: DIFT implementation in MIPS processor to prevent malicious attacks
Creators: name: Κουκουνας Αγγελος-Παναγιωτης
Publisher: name: Technical University of Crete
Year: 2018

description: Ο τομέας της ασφάλειας των υπολογιστικών συστημάτων αποτελεί έναν ιδιαίτερα ευαίσθητο και σημαντικό τομέα και είναι αναγκαία η συστηματική μελέτη του, προκειμένου να επιτευχθεί η προστασία του συστήματος και των δεδομένων που μεταφέρονται. Τα ‘τρωτά’ σημεία του λογισμικού, εκμεταλλευόμενα κατάλληλα από έναν επιτιθέμενο, μπορούν να οδηγήσουν σε μη εξουσιοδοτημένες ενέργειες, στην τροποποίηση της διάρθρωσης του συστήματος και τελικά στην πλήρη πρόσβαση σε αυτό. Για το λόγο αυτό, αναπτύσσονται συνεχώς τεχνικές που αποσκοπούν στην πρόληψη, ανίχνευση και αντιμετώπιση των κακόβουλων ενεργειών.

    Μία σχετικά πρόσφατη τεχνική είναι και αυτή του Dynamic Information Flow Tracking (DIFT) που αποτελεί έναν μηχανισμό, ο οποίος στηρίζεται στην παρακολούθηση της ροής δεδομένων που προέρχονται από μη έμπιστες πηγές. Ο μηχανισμός λειτουργεί κατά την διάρκεια εκτέλεσης του προγράμματος και η παρακολούθηση επιτυγχάνεται με την προσθήκη extra bits, επεκτείνοντας τους καταχωρητές και την μνήμη έτσι ώστε να αποθηκεύουν την παραπάνω πληροφορία. Η παραγωγή των επιπρόσθετων bits, το καθένα από τα οποία έχει και μία συγκεκριμένη λειτουργία, διέπεται από κανόνες για τον εκάστοτε τύπο εντολής που εκτελείται.

    Στην δική μας προσέγγιση, με την τροποποίηση του MIPS για την εφαρμογή του μηχανισμού DIFT, επεκτείνουμε τον επεξεργαστή κατάλληλα, με αποτέλεσμα να προστατεύει από μια ενδεχόμενη BOF επίθεση.
Internal parametricity, without an interval
Creators: name: Altenkirch, Thorsten
name: Chamoun, Yorgo
name: Kaposi, Ambrus
name: Shulman, Michael
Publisher: name: arXiv
Year: 2023
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Parametricity is a property of the syntax of type theory implying, e.g., that there is only one function having the type of the polymorphic identity function. Parametricity is usually proven externally, and does not hold internally. Internalising it is difficult because once there is a term witnessing parametricity, it also has to be parametric itself and this results in the appearance of higher dimensional cubes. In previous theories with internal parametricity, either an explicit syntax for higher cubes is present or the theory is extended with a new sort for the interval. In this paper we present a type theory with internal parametricity which is a simple extension of Martin-Löf type theory: there are a few new type formers, term formers and equations. Geometry is not explicit in this syntax, but emergent: the new operations and equations only refer to objects up to dimension 3. We show that this theory is modelled by presheaves over the BCH cube category. Fibrancy conditions are not needed because we use span-based rather than relational parametricity. We define a gluing model for this theory implying that external parametricity and canonicity hold. The theory can be seen as a special case of a new kind of modal type theory, and it is the simplest setting in which the computational properties of higher observational type theory can be demonstrated.
Dark Two Higgs Doublet Model
Creators: name: Lee, Hye-Sung
name: Sher, Marc
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We perform a detailed study of a specific Two Higgs Doublet Model (2HDM) with a U(1) gauge symmetry, instead of a typical Z2 discrete symmetry, containing a very light gauge boson Z' (GeV scale or below). The Standard Model (SM) fermions do not carry U(1) charges, but induced couplings to the Z' (called the dark Z) are generated through mixing with the SM neutral gauge bosons. Such a light Z' could explain some astrophysical anomalies as well as the muon g-2 deviation, and has been the subject of great experimental interest. We consider the scenario in which the 125 GeV SM-like Higgs (H) is the heavier scalar state, and focus on the lighter neutral state (h) as well as charged Higgs. We analyze the constraints on the model from various experiments and predict novel channels to search for these Higgs scalars at the LHC. In particular, experiments looking for lepton-jets are among potentially important searches.
description: Version published in Phys. Rev. D
Photon rings as tests for alternative spherically symmetric geometries with thin accretion disks
Creators: name: da Silva, Luís F. Dias
name: Lobo, Francisco S. N.
name: Olmo, Gonzalo J.
name: Rubiera-Garcia, Diego
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The imaging by the Event Horizon Telescope (EHT) of the supermassive central objects at the heart of the M87 and Milky Way (Sgr A$^\star$) galaxies, has marked the first step into peering at the photon rings and central brightness depression that characterize the optical appearance of black holes surrounded by an accretion disk. Recently, Vagnozzi et. al. [S.~Vagnozzi, \textit{et al.} arXiv:2205.07787 [gr-qc]] used the claim by the EHT that the size of the {\it shadow} of Sgr A$^\star$ can be inferred by calibrated measurements of the bright ring enclosing it, to constrain a large number of spherically symmetric space-time geometries. In this work we use this result to study some features of the first and second photon rings of a restricted pool of such geometries in thin accretion disk settings. The emission profile of the latter is described by calling upon three analytic samples belonging to the family introduced by Gralla, Lupsasca and Marrone, in order to characterize such photon rings using the Lyapunov exponent of nearly bound orbits and discuss its correlation with the luminosity extinction rate between the first and second photon rings. We finally elaborate on the chances of using such photon rings as observational discriminators of alternative black hole geometries using very long baseline interferometry.
description: 17 pages, 58 figures/images; v2: many comments and additions, version accepted for publication in Physical Review D
Supplementary document for Evaluation and Analysis of Optically Injection-locked Semiconductor Laser Characteristics for Optical Complex Signal Generation - 6091766.pdf
Creators: name: Talebzadeh, Seyyedeh Ladan
name: Yadipour, Reza
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: subject: 20502 Lasers and Quantum Electronics
subject: FOS: Physical sciences
subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: MATLAB codes which are used in the manuscript.
Apparatus-dependent sol-gel synthesis of TiO2 nanoparticles for dye-sensitized solar cells
Creators: name: Bansal, Jyoti
name: Swami, Sanjay Kumar
name: Singh, Akanksha
name: Sarao, Tarnija
name: Dutta, Viresh
name: Hafiz, A. K.
name: Sharma, Shailesh Narain
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences

description: Synthesis of titanium dioxide nanoparticles (TiO2 NPs) has been done by sol-gel-hydrothermal colloidal route in two different apparatus; one being simple stainless steel (named as TiO2-B) and other being at constant temperature and pressure autoclave (named as TiO2-W). These TiO2 NPs were investigated by various characterization techniques such as scanning electron microscope (SEM), X-ray diffractometer (XRD), and photoluminescence spectrophotometer. Also, it was observed that the quality of the synthesized TiO2-W NPs is comparable with the commercial TiO2 NPs (TiO2-C), whereas the cost of synthesis is almost reduced to half. The synthesized TiO2 NPs are used as the photoanode in dye-sensitized solar cell (DSSC). DSSC with TiO2-W showed better power conversion efficiency as compared to DSSC with TiO2-B.
Opus Caementitium. Neue Bautechnik der Römer. Multimedia CD-ROM, Konzeption: Dr. Ing. Heinz Otto Lamprecht, Idee und Gestaltung: Joachim Weiss
Creators: name: Rabl, Josef
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Opus Caementitium. Neue Bautechnik der Römer. Multimedia CD-ROM, Konzeption: Dr. Ing. Heinz Otto Lamprecht, Idee und Gestaltung: Joachim Weiss. Eine Produktion im Auftrag der Südwest Zement GmbH, Leonberger Straße 45, 71229 Leonberg, 1997, DM 39.00, ISBN: 3-931871-05-3.
description: Forum Classicum, Nr. 2 (1998): Forum Classicum
Correlation-aware Spatial-Temporal Graph Learning for Multivariate Time-series Anomaly Detection
Creators: name: Zheng, Yu
name: Koh, Huan Yee
name: Jin, Ming
name: Chi, Lianhua
name: Phan, Khoa T.
name: Pan, Shirui
name: Chen, Yi-Ping Phoebe
name: Xiang, Wei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Multivariate time-series anomaly detection is critically important in many applications, including retail, transportation, power grid, and water treatment plants. Existing approaches for this problem mostly employ either statistical models which cannot capture the non-linear relations well or conventional deep learning models (e.g., CNN and LSTM) that do not explicitly learn the pairwise correlations among variables. To overcome these limitations, we propose a novel method, correlation-aware spatial-temporal graph learning (termed CST-GL), for time series anomaly detection. CST-GL explicitly captures the pairwise correlations via a multivariate time series correlation learning module based on which a spatial-temporal graph neural network (STGNN) can be developed. Then, by employing a graph convolution network that exploits one- and multi-hop neighbor information, our STGNN component can encode rich spatial information from complex pairwise dependencies between variables. With a temporal module that consists of dilated convolutional functions, the STGNN can further capture long-range dependence over time. A novel anomaly scoring component is further integrated into CST-GL to estimate the degree of an anomaly in a purely unsupervised manner. Experimental results demonstrate that CST-GL can detect anomalies effectively in general settings as well as enable early detection across different time delays.
description: 17 pages, double columns, 10 tables, 3 figures. Accepted to IEEE Transactions on Neural Networks and Learning Systems (TNNLS)
title: A device-to-device caching approach for the alleviation of the fronthaul link traffic in Centralized Radio Access Networks
title: Χρήση τεχνικών αποθήκευσης προσωρινής μνήμης στις συσκευές των χρηστών για την ελάφρυνση φορτίου τελικής ζεύξης σε δίκτυα αρχιτεκτονικής C-RAN
Creators: name: Σοφικιτης Εμμανουηλ
Publisher: name: Technical University of Crete
Year: 2018

description: The proliferation of modern mobile devices and the ease of access they offer to the Internet, has led to a burst of traffic through the cellular network. This fact leads to the need and creates the motivation for the evolution of Radio Access Networks. Many researchers and organizations suggest the Centralized Radio Access Network architecture as the successor of the current deployment, even though efforts are still ongoing in order to facilitate such architecture, regarding the alleviation of the huge load that would burden the link between the centralized network processors and the antennas deployed throughout the cellular network. This link is referred to as the fronthaul. Considering the ever-growing demand of multimedia services, users’ device level caching appears to be a very promising technique to leverage the traffic offloading of the fronthaul link, while Device-to-Device technology offers the services and functions which facilitate a distribution network between cellular devices. In this thesis, we propose a Device-to-Device caching approach integrated into the Centralized Radio Access Network. According to the proposed approach, some users are storing video files in the local memory of their cellular devices in order to serve video file requests of nearby users. We first describe the main characteristics of the Device-to-Device caching network we consider and we present a system model along with its most important specifications and parameters. Then, we present four case models that we design by gradually relaxing our simplifying system model assumptions and progressively employing improved algorithmic techniques. The performance metric adopted is video hit ratio, since it provides a direct measure of the degree of fronthaul link offloading. Finally, we evaluate and discuss the performance of the above four case models obtained via simulation.
Bond order in two-dimensional metals with antiferromagnetic exchange interactions
Creators: name: Sachdev, Subir
name: La Placa, Rolando
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present an unrestricted Hartree-Fock computation of charge-ordering instabilities of two-dimensional metals with antiferromagnetic exchange interactions, allowing for arbitrary ordering wavevectors and internal wavefunctions of the particle-hole pair condensate. We find that the ordering has a dominant d symmetry of rotations about lattice points for a range of ordering wavevectors, including those observed in recent experiments at low temperatures on YBCO. This d symmetry implies the charge ordering is primarily on the bonds of the Cu lattice, and we propose incommensurate bond order parameters for the underdoped cuprates. The field theory for the onset of Neel order in a metal has an emergent pseudospin symmetry which `rotates' d-wave Cooper pairs to particle-hole pairs (Metlitski et al. arXiv:1005.1288): our results show that this symmetry has consequences even when the spin correlations are short-ranged and incommensurate.
description: 17 pages, 10 figures; (v2) added refs and clarifications; (v3) significant rewrite, and a new figure; (v4) added supplement with new figures; (v5) small final corrections
Lohmann, Dieter: Kalypso bei Homer und James Joyce. Eine vergleichende Untersuchung des 1. und 5. Buches der Odyssee und der 4. Episode (Calypso) im Ulysses von James Joyce
Creators: name: Klaus, Rüdiger
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Lohmann, Dieter: Kalypso bei Homer und James Joyce. Eine vergleichende Untersuchung des 1. und 5. Buches der Odyssee und der 4. Episode (Calypso) im Ulysses von James Joyce. Tübingen: Stauffenburg 1998. XV, 178 S., 48,00 DM (Ad Fontes. Bd 5; ISBN3-86057-184-2).
description: Forum Classicum, Nr. 3 (1998): Forum Classicum
Gemma Bellincioni
Creators: name: Festinese, Valeria
Publisher: name: Columbia University
Year: 2020
Subjects: Women in the motion picture industry
Motion pictures
Silent films

description: An opera singer turned film actress, screenwriter, director, and producer, Gemma Bellincioni wasborn in the Italian city of Monza on August 18, 1864. Both of her parents were opera singers, andBellincioni made her own theatrical debut at age six (Baccioni 4). Her first leading role was inCarlo Pedrotti’s opera “Tutti in maschera,” which opened in Naples in November 1880. Criticswere immediately impressed by her stage presence. Following this performance, Bellincioni begantouring around Italy and the world, appearing in many different operas.
Scalar-field theory of dark matter
Creators: name: Huang, Kerson
name: Xiong, Chi
name: Zhao, Xiaofei
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We develop a theory of dark matter based on a previously proposed picture, in which a complex vacuum scalar field makes the universe a superfluid, with the energy density of the superfluid giving rise to dark energy, and variations from vacuum density giving rise to dark matter. We formulate a nonlinear Klein-Gordon equation to describe the superfluid, treating galaxies as external sources. We study the response of the superfluid to the galaxies, in particular, the emergence of the dark-matter galactic halo, contortions during galaxy collisions, and the creation of vortices due to galactic rotation.
description: 25 pages, 9 figures. A new section "Long-ranged force induced by the scalar field" is added, plus a few clarifications in the paper. References updated. To appear in International Journal of Modern Physics A
title: Ηλεκτρονικό σύστημα μεγιστοποίησης του βαθμού απόδοσης Φ/Β μετατροπέων DC-DC
title: Electronic system for maximizing the efficiency of PV DC-DC converters
Creators: name: Σασων Νεκταριος
Publisher: name: Technical University of Crete
Year: 2018

description: Σε αυτή τη διπλωματική εργασία υλοποιήθηκε ένα σύστημα το οποίο έχει τη δυνατότητα, για μία δεδομένη λαμβάνουσα ενέργεια από μία φωτοβολταϊκή διάταξη, να αυξήσει την ενέργεια που τελικά αποθηκεύεται σε συστοιχίες συσσωρευτών. Πιο συγκεκριμένα, χρησιμοποιήθηκε ένας μετατροπέας DC/DC για τη μετατροπή της τάσης της φωτοβολταϊκής διάταξης σε τάση ικανή να φορτίζει τις συστοιχίες των συσσωρευτών. H λειτουργία του μετατροπέα DC/DCελέγχεται από ένα μικροελεγκτή στον οποίο εκτελούνται τρεις εναλλακτικοί αλγόριθμοι που υλοποιήθηκαν. Οι αλγόριθμοι αυτοί επιτυγχάνουν τη μέγιστη δυνατή αποθήκευση ενέργειας στους συσσωρευτές για ομοιόμορφη και μη-ομοιόμορφη πρόσπτωση ηλιακής ακτινοβολίας στη φωτοβολταϊκή διάταξη. Η λειτουργία των αλγορίθμων που αναπτύχθηκαν, βασίζεται στον έλεγχο του κύκλου λειτουργίας (duty cycle) και τη συχνότητα διακοπτισμού (switching frequency) του μετατροπέα DC/DC σε πραγματικό χρόνο. Τα πειραματικά αποτελέσματα έδειξαν ότι με το σύστημα που αναπτύχθηκε, μπορεί να αυξηθεί σημαντικά η ισχύς που μεταφέρεται από τη φωτοβολταϊκή διάταξη στους συσσωρευτές σε σύγκριση με την ισχύ που μεταφέρεται στην περίπτωση μη-βελτιστοποιημένης λειτουργίας του μετατροπέα DC/DC.
title: Remote healthcare system exploiting mobile and wearable devices
title: Σύστημα απομακρυσμένης φροντίδας μέσω κινητών και φορετών συσκευών
Creators: name: Βολτσης Ευαγγελος
Publisher: name: Technical University of Crete
Year: 2018

description: In this thesis we discuss the design and implementation of a platform that would be able to simplify and improve the life of people with special needs (caretakers). This platform will also help their families as well as professionals that have many patients under their supervision. More specifically, we present a web application supporting the creation and management of some specific events. With these events, the person that takes care of the caretaker, (caregiver) will be able to monitor him and get informed in case of an emergency. The web application is compatible with most state-of-the-art mobile devices and computers and is able to monitor more than one caretaker. We also have created an android application for smart watches. This android application will run on the smart watch that the caretaker will wear, so that the caregiver can monitor him through the web application. Finally, it is worth mentioning that the applications have been evaluated for their usability by professionals and nonprofessionals users.