cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Topology and confinement at T \neq 0 : calorons with non-trivial holonomy
Creators: name: Gerhold, P.
name: Ilgenfritz, E. -M.
name: Müller-Preussker, M.
name: Martemyanov, B. V.
name: Veselov, A. I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In this talk, relying on experience with various lattice filter techniques, we argue that the semiclassical structure of finite temperature gauge fields for T < T_c is dominated by calorons with non-trivial holonomy. By simulating a dilute gas of calorons with identical holonomy, superposed in the algebraic gauge, we are able to reproduce the confining properties below T_c up to distances r = O(4 fm} >> ρ(the caloron size). We compute Polyakov loop correlators as well as space-like Wilson loops for the fundamental and adjoint representation. The model parameters, including the holonomy, can be inferred from lattice results as functions of the temperature.
description: Talk by M. M\"uller-Preussker at "Quark Confinement and Hadron Structure VII", Ponta Delgada, Azores, Portugal, September 2 - 7, 2006, 4 pages, 2 figures, to appear in the Proceedings
Investigation of the orientation relationship between nano-sized G-phase precipitates and austenite with scanning nano-beam electron diffraction using a pixelated detector
Creators: name: Cautaerts, Niels
name: Rauch, Edgar F.
name: Jeong, Jiwon
name: Dehm, Gerhard
name: Liebscher, Christian H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Scanning nano-beam electron diffraction with a pixelated detector was employed to investigate the orientation relationship of nanometer sized, irradiation induced G-phase (M$_6$Ni$_{16}$Si$_{7}$) precipitates in an austenite matrix. Using this detector, the faint diffraction spots originating from the small G-phase particles could be resolved simultaneously as the intense matrix reflections. The diffraction patterns were analyzed using a two-stage template matching scheme, whereby the matrix is indexed first and the precipitates are indexed second after subtraction of the matrix contribution to the diffraction patterns. The results show that G-phase forms with orientation relationships relative to austenite that are characteristic of face-centered cubic (FCC) to body-centered cubic (BCC) transformations. This work demonstrates that nano-beam electron diffraction with a pixelated detector is a promising technique to investigate orientation relationships of nano-sized precipitates with complex crystal structures in other material systems with relative ease.
description: 12 pages double spaced text, 4 figures, accepted manuscript in Scripta Materialia
Additional file 1: of The epigenetically downregulated factor CYGB suppresses breast cancer through inhibition of glucose metabolism
Creators: name: Feng, Yixiao
name: Wu, Mingjun
name: Li, Shuman
name: He, Xiaoqian
name: Tang, Jun
name: Peng, Weiyan
name: Zeng, Beilei
name: Deng, Chuxia
name: Ren, Guosheng
name: Xiang, Tingxiu
Publisher: name: figshare
Year: 2018
Subjects: subject: Biochemistry
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer

description: Detailed description of the GC-MS metabolomics assay method. (DOC 36 kb)
title: Voice through silence algorithmic visibility, ordinary civic voices and bottom-up authoritarianism in the Brazilian crisis
Creators: name: Magalhães, João Carlos Vieira
Publisher: name: London School of Economics and Political Science (LSE)
Year: 2019

description: From 2013 to 2018, Brazil was encapsulated in a multisited crisis that unsettled its political order. Unlike other turmoil in the country’s history, this one was strongly influenced by ordinary Brazilians who found a space to express themselves politically on digital platforms. This thesis aims to understand how the datafied government of users’ visibility by Facebook (Brazil’s most popular platform) can be understood to have structured these everyday experiences and, in so doing, to have prompted these individuals to (re)constitute the ways they act and comprehend themselves as citizens. To investigate these processes of civic becoming, the thesis develops a conceptual framework that uses elements of social practices theory to bridge critical notions of citizenship, recognition, datafication, and visibility. It is proposed that one of Facebook’s primary power techniques is the attempt to direct how the algorithmic visibility regime that supports its business model is imagined by users so as to try to prefigure these users’ actions. A thematic analysis of interviews with 47 users suggests that the ambiguous knowability of the platform’s machine learning algorithms gives rise to three sociomaterial imaginaries of its algorithmic visibility regime. Combined with assumptions about Brazil’s troubled democracy, these imaginaries (and the imagined others that populate them) are found to generate a paradoxical understanding of how civic worth is granted on Facebook, according to which being heard often depends on silencing others and oneself – a phenomenon theorised as bottom-up authoritarianism.
Peierls distorted chain as a quantum data bus for quantum state transfer
Creators: name: Huo, M. X.
name: Li, Ying
name: Song, Z.
name: Sun, C. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We systematically study the transfer of quantum state of electron spin as the flying qubit along a half-filled Peierls distorted tight-binding chain described by the Su-Schrieffer-Heeger (SSH) model, which behaves as a quantum data bus. This enables a novel physical mechanism for quantum communication with always-on interaction: the effective hopping of the spin carrier between sites $A$ and $B$ connected to two sites in this SSH chain can be induced by the quasi-excitations of the SSH model. As we prove, it is the Peierls energy gap of the SSH quasi-excitations that plays a crucial role to protect the robustness of the quantum state transfer process. Moreover, our observation also indicates that such a scheme can also be employed to explore the intrinsic property of the quantum system.
description: 10 pages, 6 figures
Superradiance in Kerr-like black holes
Creators: name: Franzin, Edgardo
name: Liberati, Stefano
name: Oi, Mauro
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Recent strong-field regime tests of gravity are so far in agreement with general relativity. In particular, astrophysical black holes appear all to be consistent with the Kerr spacetime, but the statistical error on current observations allows for small yet detectable deviations from this description. Here we study superradiance of scalar and electromagnetic test fields around the Kerr-like Konoplya--Zhidenko black hole and we observe that for large values of the deformation parameter superradiance is highly suppressed with respect to the Kerr case. Surprisingly, there exists a range of small values of the deformation parameter for which the maximum amplification factor is larger than the Kerr one. We also provide a first result about the superradiant instability of these non-Kerr spacetimes against massive scalar fields.
description: 10+ pages, 6 figures, data available at https://github.com/efranzin/SuperradianceKZ Minor corrections, accepted in PRD
Parameters of the Free Core Nutation from VLBI Data
Creators: name: Malkin, Z.
name: Terentev, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Several VLBI EOP series were investigated with goal of determination of parameters of the Free Core Nutation (FCN). Both the amplitude and period of the FCN were studied using spectral and wavelet analysis. Our analysis reveals a variability of both the amplitude (known also from other investigations) and the period (or phase) of the FCN nutation. The FCN amplitude varies in the range about 0.1--0.3 mas, and the FCN period -- in the range about 415--490 solar days. The latter may be also explained by changes in the FCN phase. Comparison of time variations of the FCN period and amplitude obtained by different authors and methods shows substantial discrepancies at the edges of the period of observations.
description: 16 pages, 14 figures
Neutral perfect fluids and charged thin shells with electromagnetic mass in general relativity
Creators: name: Varela, Victor
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We build extended sources for the Reissner-Nordström metric. Our models describe a neutral perfect fluid core bounded by a charged thin shell, and feature everywhere positive rest mass density and everywhere non-negative active gravitational mass, as well as classical electron radius and electromagnetic total mass. We contrast our results with previously discussed models featuring similar properties at the expense of including anisotropic pressures within the fluid. Our charged thin shells are restricted by the 2D texture equation of state which causes the continuity of the active gravitational mass, in spite of the singularity of the energy-momentum tensor. We mention possible extensions of this study suggested by modified active mass formulae proposed in the literature.
description: 8 pages
Magnetic field-induced non-trivial electronic topology in Fe3GeTe2
Creators: name: Macy, Juan
name: Ratkovski, Danilo
name: Balakrishnan, Purnima P.
name: Strungaru, Mara
name: Chiu, Yu-Che
name: Flessa, Aikaterini
name: Moon, Alex
name: Zheng, Wenkai
name: Weiland, Ashley
name: McCandless, Gregory T.
name: Chan, Julia Y.
name: Kumar, Govind S.
name: Shatruk, Michael
name: Grutter, Alexander J.
name: Borchers, Julie A.
name: Ratcliff, William D.
name: Choi, Eun Sang
name: Santos, Elton J. G.
name: Balicas, Luis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The anomalous Hall, Nernst and thermal Hall coefficients of Fe$_{3-x}$GeTe$_2$ display several features upon cooling, like a reversal in the Nernst signal below $T = 50$ K pointing to a topological transition (TT) associated to the development of magnetic spin textures. Since the anomalous transport variables are related to the Berry curvature, a possible TT might imply deviations from the Wiedemann-Franz (WF) law. However, the anomalous Hall and thermal Hall coefficients of Fe$_{3-x}$GeTe$_2$ are found, within our experimental accuracy, to satisfy the WF law for magnetic-fields $μ_0H$ applied along its inter-layer direction. Surprisingly, large anomalous transport coefficients are also observed for $μ_0H$ applied along the planar \emph{a}-axis as well as along the gradient of the chemical potential, a configuration that should not lead to their observation due to the absence of Lorentz force. However, as $μ_0H$ $\|$ \emph{a}-axis is increased, magnetization and neutron scattering indicate just the progressive canting of the magnetic moments towards the planes followed by their saturation. These anomalous planar quantities are found to not scale with the component of the planar magnetization ($M_{\|}$), showing instead a sharp decrease beyond $\sim μ_0 H_{\|} = $ 4 T which is the field required to align the magnetic moments along $μ_0 H_{\|}$. We argue that locally chiral spin structures, such as skyrmions, and possibly skyrmion tubes, lead to a field dependent spin-chirality and hence to a novel type of topological anomalous transport. Locally chiral spin-structures are captured by our Monte-Carlo simulations incorporating small Dzyaloshinskii-Moriya and biquadratic exchange interactions.
description: 34 pages, 10 figures, submitted to Applied Physics Reviews
Effect of formulations on in vitro skin permeation of some metals from mineral clays
Creators: name: A. Priprem
name: L. Wankao
Publisher: name: Faculty of Pharmacy, Mahidol University
Year: 2015
Subjects: mineral clay,in vitro skin permeation,Mg2+,Mn2+,Zn2+,Cu2+

description: 1, 42, Mahidol University Journal of Pharmaceutical Sciences
Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
Creators: name: Bulgac, Aurel
name: Drut, Joaquin E.
name: Magierski, Piotr
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The Quantum Monte Carlo method for spin 1/2 fermions at finite temperature is formulated for dilute systems with an s-wave interaction. The motivation and the formalism are discussed along with descriptions of the algorithm and various numerical issues. We report on results for the energy, entropy and chemical potential as a function of temperature. We give upper bounds on the critical temperature T_c for the onset of superfluidity, obtained by studying the finite size scaling of the condensate fraction. All of these quantities were computed for couplings around the unitary regime in the range -0.5 \le (k_F a)^{-1} \le 0.2, where a is the s-wave scattering length and k_F is the Fermi momentum of a non-interacting gas at the same density. In all cases our data is consistent with normal Fermi gas behavior above a characteristic temperature T_0 > T_c, which depends on the coupling and is obtained by studying the deviation of the caloric curve from that of a free Fermi gas. For T_c < T < T_0 we find deviations from normal Fermi gas behavior that can be attributed to pairing effects. Low temperature results for the energy and the pairing gap are shown and compared with Green Function Monte Carlo results by other groups.
description: 24 pages, 20 figures, published version, additional material and figures
Unit cost analysis of Thai massage: Case study from Huayploo Hospital, Thailand
Creators: name: R. Chalongsuk
name: W. Patomsirisakun
name: S. Kiddee
name: S. Doltrakan
name: S. Pherm-Ariyasap
Publisher: name: Faculty of Pharmacy, Mahidol University
Year: 2015
Subjects: Unit cost,Thai massage,activity-based costing

description: 1, 42, Mahidol University Journal of Pharmaceutical Sciences
Evaluation of antidepressant like activity in Amaranthus caudatus
Creators: name: B.S. Ashok Kumar
name: K. Lakshman
name: Saleemullakhan
name: C. Velmurugan
name: E.R. Vishwanath
name: S. Gopisetty
Publisher: name: Faculty of Pharmacy, Mahidol University
Year: 2015
Subjects: Amaranthus caudatus,Antidepressant activity,Tail suspension test,Forced swimming test

description: 1, 42, Mahidol University Journal of Pharmaceutical Sciences
High Energy Behaviour of Light Meson Photoproduction
Creators: name: Amaryan, Moskov J.
name: Briscoe, William J.
name: Ryskin, Michael G.
name: Strakovsky, Igor I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We evaluated recent CLAS Collaboration measurements for the $90^\circ$ meson photoproduction off the nucleon using a tagged photon beam spanning the energy interval $s = 3 - 11$ GeV$^2$. The results are compared with the "Quark Counting Rules" predictions.
description: 9 pages, 5 figures, 1 table, revised version
Gravitational back-reaction from colliding travelling waves on a cosmic string
Creators: name: Wells, R. Glenn
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis, I investigate the effects of the gravitational back-reaction force on two colliding triangular pulses travelling along an infinite cosmic string. The force is deter mined using a perturbative approach in the Lorentz gauge. This gauge choice is found to be reasonable in several aspects. Firstly, there is no gravitational back-reaction force on a single travelling wave. Secondly, the energy emitted by the string as gravitational radiation is the same as that lost by the string due to the back-reaction. Finally, the force can be made perpendicular to the string such that the perturbed string trajectory con tinues to satisfy the equations of motion. Unfortunately, the force equations contain an arbitrary gauge freedom making it difficult to form definite statements about the effects of the back-reaction force. However, choosing a reasonable value for the gauge parameter results in the two wave pulses being flattened out and having their sharp kinks rounded off.
Systematic experimental comparison of particle filtration efficiency test methods for commercial respirators and face masks
Creators: name: Corbin, Joel C.
name: Smallwood, Greg J.
name: Leroux, Ian
name: Oliaee, Jalal Norooz
name: Liu, Fengshan
name: Sipkens, Timothy A.
name: Green, Richard G.
name: Murnaghan, Nathan F.
name: Koukoulas, Triantafillos
name: Lobo, Prem
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Respirators, medical masks, and barrier face coverings all filter airborne particles using similar physical principles. However, they are tested for certification using a variety of standardized test methods, creating challenges for the comparison of differently certified products. We have performed systematic experiments to quantify and understand the differences between standardized test methods for N95 respirators (NIOSH TEB-APR-STP-0059 under US 42 CFR 84), medical face masks (ASTM F2299/F2100), and COVID-19-related barrier face coverings (ASTM F3502-21). Our experiments demonstrate the role of face velocity, particle properties (mean size, size variability, electric charge, density, and shape), measurement techniques, and environmental preconditioning. The measured filtration efficiency was most sensitive to changes in face velocity and particle charge. Relative to the NIOSH method, users of the ASTM F2299/F2100 method have commonly used non-neutralized (highly charged) aerosols as well as smaller face velocities, each of which may result in approximately 10% higher measured filtration efficiencies. In the NIOSH method, environmental conditioning at elevated humidity increased filtration efficiency in some commercial samples while decreasing it in others, indicating that measurement should be performed both with and without conditioning. More generally, our results provide an experimental basis for the comparison of respirators certified under various international methods, including FFP2, KN95, P2, Korea 1st Class, and DS2.
description: 34 pages, 8 figures, 3 tables
Bioequivalence study of torsemide 10 mg tablets in healthy Thai volunteers
Creators: name: P. Teerawonganan
name: E. Yoosakul
name: P. Ratnatilaka Na Bhuket
name: B. Chuasuwan
name: I. Techatanawat
name: P. Narakorn
name: A. Rojanawiwat
name: A. Eksaengsri
Publisher: name: Faculty of Pharmacy, Mahidol University
Year: 2015
Subjects: Torsemide,Pharmacokinetics,Bioequivalence,Liquid chromatography tandem mass spectrometry

description: 1, 42, Mahidol University Journal of Pharmaceutical Sciences
Violation of the fluctuation-dissipation theorem in a protein system
Creators: name: Hayashi, Kumiko
name: Takano, Mitsunori
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We report the results of molecular dynamics simulations of the protein myosin carried out with an elastic network model. Quenching the system, we observe glassy behavior of a density correlation function and a density response function that are often investigated in structure glasses and spin glasses. In the equilibrium, the fluctuation-response relation, a representative relation of the fluctuation-dissipation theorem, holds that the ratio of the density correlation function to the density response function is equal to the temperature of the environment. We show that in the quenched system that we study, this relation can be violated. In the case that this relation does not hold, this ratio can be regarded as an effective temperature. We find that this effective temperature of myosin is higher than the temperature of the environment. We discuss the relation between this effective temperature and energy transduction that occurs after ATP hydrolysis in the myosin molecule.
description: 8 pages, to appear in Biophys. J
Anharmonic Infrared Spectra of Thermally Excited Pyrene(C$_{16}$H$_{10}$): the combined view of DFT-based GVPT2 with AnharmonicCaOs and approximate DFT molecular dynamics with DemonNano
Creators: name: Chakraborty, Shubhadip
name: Mulas, Giacomo
name: Rapacioli, Mathias
name: Joblin, Christine
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The study of the Aromatic Infrared Bands (AIBs) in astronomical environments has opened interesting spectroscopic questions on the effect of anharmonicity on the infrared (IR) spectrum of hot polycyclic aromatic hydrocarbons (PAHs) and related species in isolated conditions. The forthcoming James Webb Space Telescope will unveil unprecedented spatial and spectral details in the AIB spectrum; significant advancement is thus necessary now to model the infrared emission of PAHs, their presumed carriers, with enough detail to exploit the information content of the AIBs. This requires including anharmonicity in such models, and to do so systematically for all species included, requiring a difficult compromise between accuracy and efficiency. We performed a benchmark study to compare the performances of two methods in calculating anharmonic spectra, comparing them to available experimental data. One is a full quantum method, AnharmoniCaOs, relying on an ab initio potential, and the other relies on Molecular Dynamics simulations using a Density Functional based Tight Binding potential. The first one is found to be very accurate and detailed, but it becomes computationally very expensive for increasing temperature; the second is faster and can be used for arbitrarily high temperatures, but is less accurate. Still, its results can be used to model the evolution with temperature of isolated bands. We propose a new recipe to model anharmonic AIB emission using minimal assumptions on the general behaviour of band positions and widths with temperature, which can be defined by a small number of empirical parameters. Modelling accuracy will depend critically on these empirical parameters, allowing for an incremental improvement in model results, as better estimates become gradually available.
description: accepted for publication on the Journal of Molecular Spectroscopy
Improving inventory control efficiency in the wholesale industry by using analytical and simulation methods
Creators: name: Αφεντούλης, Χρήστος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Διαχείριση αποθεμάτων
Προσομοίωση συστημάτων εφοδιασμού
Διοίκηση αλυσίδας εφοδιασμού
Inventory management
Simulation of supply and production systems
Logistics and supply chain management

description: The purpose of this research is to further examine the ways that contemporary SMEs (Small-Medium Enterprises) in the supply chain can follow to deal with demand uncertainty, minimize costs and at the same time maximize customer satisfaction. Though this paper we developed and applied a single SKU simulation model in the procurement reality of Periferiaki Tires S.A. After reviewing academic literature on product ABC analysis, forecasting methods, MRP techniques and simulation knowledge, we further analyzed the existing inventory management of the firm. In addition, the results were statistically analyzed, and it was proved that the newly proposed inventory replenishment policies are offering minimization of total annual cost and elimination of stock-out events. Generally, the managers in the wholesale industry have to deeply understand that investing more in procurement could aid companies to stand against competition in the global markets. Concluding with the research, we support academics to focus on further development of simulation models that can be integrated in ERP (Enterprise Resource Planning) systems and automatically update data through the RFID (Radio-Frequency Identification) technologies.
description: Σκοπός της παρούσας έρευνας είναι να εξετάσει περαιτέρω τους τρόπους που μπορούν να ακολουθήσουν οι σύγχρονες ΜΜΕ στην εφοδιαστική αλυσίδα για να αντιμετωπίσουν την αβεβαιότητα της ζήτησης, να ελαχιστοποιήσουν το κόστος και ταυτόχρονα να μεγιστοποιήσουν την ικανοποίηση των πελατών. Στο παρόν έγγραφο αναπτύξαμε και εφαρμόσαμε ένα ενιαίο μοντέλο προσομοίωσης ενός προϊόντος που συμπεριλαμβάνεται στις προπαραγγελίες της εταιρείας Περιφερειακή Ελαστικά Α.Ε. προς τον κύριο προμηθευτή της. Μετά την ανασκόπηση της ακαδημαϊκής βιβλιογραφίας για την ανάλυση προϊόντων ABC, μεθόδους πρόβλεψης, τεχνικές MRP και μεθόδους προσομοίωσης, αναλύσαμε περαιτέρω την υπάρχουσα διαχείριση αποθεμάτων της εταιρείας. Επιπλέον, τα αποτελέσματα αναλύθηκαν στατιστικά και αποδείχθηκε ότι οι προτεινόμενες πολιτικές αναπλήρωσης αποθεμάτων παρέχουν την ελαχιστοποίηση του συνολικού ετήσιου κόστους και την εξάλειψη των ελλείψεων στα αποθέματα. Γενικά, τα στελέχη που διοικούν εταιρείες που ασχολούνται με τη χονδρική είναι απαραίτητο να κατανοήσουν ότι για να αντιμετωπίσουν τον ανταγωνισμό στις παγκόσμιες αγορές κρίνεται αναγκαία η αύξηση των επενδύσεων για την ενίσχυση της διαδικασίας αγορών. Τελειώνοντας με την έρευνα, υποστηρίζουμε τους ακαδημαϊκούς να επικεντρωθούν στην περαιτέρω ανάπτυξη μοντέλων προσομοίωσης που μπορούν να ενσωματωθούν στα συστήματα ERP (Enterprise Resource Planning) και να ενημερώσουν αυτόματα τα δεδομένα μέσω των τεχνολογιών RFID (Radio-Frequency Identification).
MAMLAKATIMIZDA MUQOBIL ENERGIYA MANBALARIDAN FOYDALANISHNING XOZIRGI KUNDAGI O'RNI VA ISTIQBOLLARI.
Creators: name: Ermatov, V.A.
name: Batirov, B.K.
name: Zhong, Weizhou
name: Yang, Xueji
name: Guo, Fei
Publisher: name: Zenodo
Year: 2025

description: Maqolada bugungi kunda muqobil energiya manbalaridan foydalinish bo‘yicha dunyo amaliyoti va bu borada olib borilayotgan ilmiy izlanishlar katta ahamiyatga ega ekanligi, tabiiy resurslarning dunyo bo‘yicha zaxiralarining kamaiyb borayotganligi, shuningdek respublikamizda energiya samaradorligiga erishish maqsadida olib borilayotgan ilmiy izlanishlar, jumladan qayta tiklanuvchi energiya manbalaridan foydalanish bo‘yicha tavsiyalar berilgan.
Οι φιλικές σχέσεις ατόμων με υψηλής λειτουργικότητας Διαταραχή Αυτιστικού Φάσματος στο σχολικό πλαίσιο: Μία μελέτη περίπτωσης
Creators: name: Χατζής, Κωνσταντίνος Μιλτιάδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Φιλικές σχέσεις-αυτιστικοί
Διαταραχή Αυτιστικού Φάσματος
Σχολικό Περιβάλλον
Friendships-Autistic people
Autism Spectrum Disorder
School environment

description: Η εξέχουσα δυσκολία των ατόμων με Διαταραχή Αυτιστικού Φάσματος (ΔΑΦ) παρατηρείται στις κοινωνικές δεξιότητες. Οι φιλικές σχέσεις αποτελούν μία από τις προεκτάσεις των κοινωνικών δεξιοτήτων. Τόσο βιβλιογραφικά όσο και εμπειρικά επισημαίνεται μία έντονη δυσκολία στην σύναψη και διατήρηση φιλικών σχέσεων ανάμεσα σε άτομα με ΔΑΦ και τυπικά αναπτυσσόμενους συνομηλίκους. Η παρούσα εργασία αποτελεί την μελέτη περίπτωσης του Α., ενός εφήβου με υψηλής λειτουργικότητας ΔΑΦ στο περιβάλλον του σχολείου κατά το σχολικό έτος 2016 - 2017. Διερευνώνται σε βάθος οι κοινωνικές / φιλικές σχέσεις του με τους τυπικά αναπτυσσόμενους συνομηλίκους του καθώς και ο τρόπος με τον οποίο ο Α. αντιλαμβάνεται την φιλία. Από τα αποτελέσματα της έρευνας προκύπτει ότι ο Α. είναι σε θέση να δημιουργήσει φιλικές σχέσεις με τους συμμαθητές του ύστερα από ένα δομημένο πρόγραμμα παρέμβασης ενώ παράλληλα διακρίνεται ότι αντιλαμβάνεται την έννοια της φιλίας και την συνδέει με τις έννοιες της υποστήριξης και της συντροφικότητας.
description: People with Autism Spectrum Disorder show an extensive difficulty in their social skills. Knowledge gained from literature review combined with clinical practice highlights that their lack of social skills influences their ability to form and maintain long term friendships with typically developing peers. The thesis analyses the case study of A., a high functional adolescent diagnosed with Autism Spectrum Disorder (ASD), in his school environment in the school year of 2016 - 2017. The study focuses in two variables. Firstly, it investigates the social skills and the friendship between A. and his typically developing peers and secondly the way that A. perceives friendship. Research’s results show that A. is able to form friendships with his classmates and that he associates friendship quality with moral support and companionship.
Scattering by PT-symmetric non-local potentials
Creators: name: Cannata, Francesco
name: Ventura, Alberto
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A general formalism is worked out for the description of one-dimensional scattering by non-local separable potentials and constraints on transmission and reflection coefficients are derived in the cases of P, T, or PT invariance of the Hamiltonian. The case of a solvable Yamaguchi potential is discussed in detail.
description: 11 pages
Open String Descriptions of Space-like Singularities in Two Dimensional String Theory
Creators: name: Das, Sumit R.
name: Santos, Luiz H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The matrix model formulation of two dimensional string theory has been shown to admit time dependent classical solutions whose closed string duals are geodesically incomplete space-times with space-like boundaries. We investigate some aspects of the dynamics of fermions in one such background. We show that even though the background solution appears pathological, the time evolution of the system is smooth in terms of open string degrees of freedom, viz. the fermions. In particular, an initial state of fermions evolves smoothly into a well defined final state over an infinite open string time interval, while the time perceived by closed strings appears to end abruptly. We outline a method of calculating fermion correlators exactly using symmetry properties. The result for the two point function is consistent with the semiclassical picture.
description: LaTeX 8 eps figures, referenced added
The Casimir Effect for Parallel Plates Revisited
Creators: name: Kawakami, N. A.
name: Nemes, M. C.
name: Wreszinski, W. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Casimir effect for a massless scalar field with Dirichlet and periodic boundary conditions (b.c.) on infinite parallel plates is revisited in the local quantum field theory (lqft) framework introduced by B.Kay. The model displays a number of more realistic features than the ones he treated. In addition to local observables, as the energy density, we propose to consider intensive variables, such as the energy per unit area $ε$, as fundamental observables. Adopting this view, lqft rejects Dirichlet (the same result may be proved for Neumann or mixed) b.c., and accepts periodic b.c.: in the former case $ε$ diverges, in the latter it is finite, as is shown by an expression for the local energy density obtained from lqft through the use of the Poisson summation formula. Another way to see this uses methods from the Euler summation formula: in the proof of regularization independence of the energy per unit area, a regularization-dependent surface term arises upon use of Dirichlet b.c. but not periodic b.c.. For the conformally invariant scalar quantum field, this surface term is absent, due to the condition of zero trace of the energy momentum tensor, as remarked by B.De Witt. The latter property does not hold in tha application to the dark energy problem in Cosmology, in which we argue that periodic b.c. might play a distinguished role.
description: 25 pages, no figures, latex
Fractional Dynamics of Systems with Long-Range Space Interaction and Temporal Memory
Creators: name: Tarasov, Vasily E.
name: Zaslavsky, George M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Field equations with time and coordinates derivatives of noninteger order are derived from stationary action principle for the cases of power-law memory function and long-range interaction in systems. The method is applied to obtain a fractional generalization of the Ginzburg-Landau and nonlinear Schrodinger equations. As another example, dynamical equations for particles chain with power-law interaction and memory are considered in the continuous limit. The obtained fractional equations can be applied to complex media with/without random parameters or processes.
description: 30 pages, LaTeX
Theory of Bose-Einstein condensation and superfluidity of two-dimensional polaritons in an in-plane harmonic potential
Creators: name: Berman, Oleg L.
name: Lozovik, Yurii E.
name: Snoke, David W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent experiments have shown that it is possible to create an in-plane harmonic potential trap for a two-dimensional (2D) gas of exciton-polaritons in a microcavity structure, and evidence has been reported of Bose-Einstein condensation of polaritons accumulated in this type of trap. We present here the theory of Bose-Einstein condensation (BEC) and superfluidity of the exciton polaritons in a harmonic potential trap. Along the way, we determine a general method for defining the superfluid fraction in a 2D trap, in terms of angular momentum representation. We show that in the continuum limit, as the trap becomes shallower the superfluid fraction approaches the 2D Kosterlitz-Thouless limit, while the condensate fraction approaches zero, as expected.
description: 14 pages, 5 figures. Accepted for publication by Physical review B
Διερεύνηση των παραγόντων ικανοποίησης και δυσαρέσκειας των πελατών στον τομέα των τηλεπικοινωνιών
Creators: name: Δήμου, Νικόλαος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: πελατειακή ικανοποίηση
πελατειακή δυσαρέσκεια
πελατειακή πίστη
τηλεπικοινωνίες
παράγοντες ικανοποίησης/ δυσαρέσκειας
customer satisfaction
customer dissatisfaction
customer loyalty
telecommunications
satisfaction / dissatisfaction factors

description: Στην παρούσα διπλωματική εργασία διερευνήθηκε η ικανοποίηση και η δυσαρέσκεια των πελατών των τηλεπικοινωνιακών παρόχων και η επίδραση που έχουν στην πελατειακή πίστη. Ο μεγάλος αριθμός συνδρομητών σταθερής τηλεφωνίας και ίντερνετ και παράλληλα ο ολοένα και μειούμενος αριθμός των τηλεπικοινωνιακών παρόχων καθιστούν απαραίτητη την περαιτέρω διερεύνηση των χαρακτηριστικών των πελατών και την αποκρυπτογράφηση των επιθυμιών τους. Ως εκ τούτου για την ικανοποίηση αυτού του σκοπού διεξήχθη μια διαδικτυακή έρευνα με στόχο την ανεύρεση εκείνων των χαρακτηριστικών των πελατών των τηλεπικοινωνιακών παρόχων που επηρεάζουν την ικανοποίηση και την δυσαρέσκειά τους. Τα αποτελέσματα της έρευνας υπέδειξαν ότι οι παράγοντες υγιεινής, οι δισθενείς και οι παρακινητικοί παράγοντες επηρεάζουν την λειτουργική και την παρακινητική αντίληψη των πελατών και αυτοί με τη σειρά τους επηρεάζουν την ικανοποίηση και την δυσαρέσκειά τους. Η παρούσα εργασία δίνει την δυνατότητα στους ερευνητές και στα στελέχη των επιχειρήσεων που ασχολούνται με τον τηλεπικοινωνιακό τομέα να αναγνωρίσουν τα χαρακτηριστικά των τηλεπικοινωνιακών υπηρεσιών που οδηγούν στην ικανοποίηση και στην δυσαρέσκεια των πελατών και να παρατηρήσουν τον τρόπο που επηρεάζουν την πελατειακή πίστη.
description: This diploma thesis investigated the satisfaction and dissatisfaction of the customers of the telecommunications providers and their impact on customer loyalty. The large number of fixed telephony and internet subscribers and the ever-decreasing number of telecommunications providers make it necessary to further explore the characteristics of customers and decrypt their desires. Therefore, in order to meet this goal, an online survey was conducted to find out the characteristics of the customers of the telecommunications providers that affect their satisfaction and dissatisfaction. The results of our research have suggested that hygiene factors, bivalent factors and motivating factors affect the functional and motivational perception of clients and they in turn affect their satisfaction and dissatisfaction. This paper enables researchers and business executives involved in the telecommunication sector to recognize the characteristics of telecommunications services that lead to customer satisfaction and dissatisfaction and to observe how they affect customer loyalty.
Osteosynthesis metal plate system for bone fixation using bicortical screws: numerical modelling
Creators: name: Olmos, Andrea
name: Fertuzinhos A
name: Dias, I.
name: Pereira, Fábio
name: Moura, Marcelo De
name: Zille, Andrea
name: Dourado, Nuno
Publisher: name: figshare
Year: 2021
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering
subject: 91307 Numerical Modelling and Mechanical Characterisation

description: This work describes the numerical modelling of an immobilization system currently used to repair long bone fractures. The referred system was employed to ensure the mechanical stabilization of an oblique bone fracture by means of a dynamic compression plate (DCP) and bicortical screws. The numerical characterization of the fixation system was performed to obtain stress and strain fields in cortical bone tissue. The validation of the numerical model was performed using experimental data previously obtained in other work. Since the experimental characterization indorsed the visualization of the screw pull-out phenomenon during the loading process, damage parameters (trapezoidal law) were measured experimentally in this region. These parameters were introduced in the finite element model (FEM) to simulate the initiation and propagation of damage in bone tissue. A mixed-mode (I+II) damage law was used to mimic the mechanical behaviour of the bone fracture and the screw-bone interface.
Πρόβλεψη Τιμών στη Λιανική
Creators: name: Μάνθος, Κωνσταντίνος Σωκράτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Πρόβλεψη τιμών στη λιανική
Επιχειρηματική ευφυΐα
Μηχανική μάθηση
Price predictions in retail
Business intelligence
Machine learning

description: Η διπλωματική εργασία αυτή έγινε στα πλαίσια του Διατμηματικού Μεταπτυχιακού «Πληροφορικής και Διοίκησης» των τμημάτων Πληροφορικής και Οικονομικών του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης. Επιδίωξη αυτής της διπλωματική εργασίας είναι να φωτιστούν οι διάφορες πτυχές Επιχειρηματικής Ευφυΐας ειδικότερα στις προβλέψεις τιμών. Σημαντική συνεισφορά αυτής της διπλωματικής εργασίας αποτελεί η ανάπτυξη ενός Εργαλείου - Διαδικασίας αποτελεσματικής πρόβλεψης τιμών με στοιχεία βελτιστοποίησης και ανάλυσης συναισθήματος. Συνδυάζοντας τα βασικά της ανάλυσης χρονοσειρών και εργαλείων μηχανικής μάθησης στην R το προτεινόμενο Εργαλείο – Διαδικασία αποτελεί ουσιαστικά μια αυτοματοποιημένη διαδικασία τιμολόγησης εμπορευμάτων λιανεμπορίου είτε στο γενικό λιανεμπόριο είτε σε on line κατάστημα για “flash sales”. Το πειραματικό μέρος έδειξε πως λειτουργεί αυτό το εργαλείο – διαδικασία και τα δεδομένα που χρησιμοποιήθηκαν έδωσαν αρκετά χρήσιμα συμπεράσματα.
description: This diploma thesis took place within the Interdepartmental Postgraduate "Informatics and Management" of the departments of Informatics and Economics of the Aristotle University of Thessaloniki. The aim of this diploma thesis is to highlight the various aspects of Business Intelligence in particular in price forecasts. An important contribution of this diploma thesis is the development of an Effective Price Predicting Tool - Estimation and Emotional Analysis. By combining the basics of time series and engineering learning tools with R, the proposed Tool-Process is essentially an automated retail merchant pricing process in either the general retailer or an on-line shop for "flash sales". The experimental part showed how this tool works - the process and the data used gave quite useful conclusions.
A physics-inspired alternative to spatial filtering for large-eddy simulations of turbulent flows
Creators: name: Johnson, Perry L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Large-eddy simulations (LES) are widely-used for computing high Reynolds number turbulent flows. Spatial filtering theory for LES is not without its shortcomings, including how to define filtering for wall-bounded flows, commutation errors for non-uniform filters, and extensibility to flows with additional complexity, such as multiphase flows. In this paper, the theory for LES is reimagined using a coarsening procedure that imitates nature. This physics-inspired approach is equivalent to Gaussian filtering for single-phase wall-free flows but opens up new insights for modeling even in that simple case. Boundaries and nonuniform resolution can be treated seemlessly in this framework without commutation errors, and the divergence-free condition is retained for incompressible flows. An alternative to the Germano identity is introduced and used to define a dynamic procedure without the need for a test filter. Potential extensions to more complex physics are briefly discussed.
Chalcogenide perovskite BaZrS3 thin-film electronic and optoelectronic devices by low temperature processing
Creators: name: Yu, Zhonghai
name: Wei, Xiucheng
name: Zheng, Yixiong
name: Hui, Haolei
name: Bian, Mengying
name: Dhole, Samyak
name: Seo, Jung-Hun
name: Sun, Yi-Yang
name: Jia, Quanxi
name: Zhang, Shengbai
name: Yang, Sen
name: Zeng, Hao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Owing to its superior visible light absorption and high chemical stability, chalcogenide perovskite barium zirconium sulfide has attracted significant attention in the past few years as a potential alternative to hybrid halide perovskites for optoelectronics. However, the high processing temperatures of BaZrS3 thin films at above 1000 C severely limits their potential for device applications. Herein, we report the synthesis of BaZrS3 thin films at temperatures as low as 500 C, by changing the chemical reaction pathway. The single phase BaZrS3 thin film was confirmed by X-ray diffraction and Raman spectroscopies. Atomic force microscopy and scanning electron microscopy show that crystalline size and surface roughness were consistently reduced with decreasing annealing temperature. The lower temperatures further eliminate sulfur vacancies and carbon contaminations associated with high temperature processing. The ability to synthesize chalcogenide perovskite thin films at lower temperatures removes a major hurdle for their device fabrication. The photodetectors demonstrate fast response and an on/off ratio of 80. The fabricated field effect transistors show an ambipolar behavior with electron and hole mobilities of 16.8 cm2/Vs and 2.6 cm2/Vs, respectively.
Auge y crisis de las democracias pactadas
Creators: name: Bautista de Alemán, Paola Rocío
Publisher: name: Universität Rostock
Year: 2019
Subjects: subject: 320 Political science

description: "Auge y crisis de las democracias pactadas: Venezuela, España y Chile" es un estudio de política comparada que analiza el nacimiento y las posibles crisis que pudieran emerger tiempo después de ser inauguradas.La investigadora tomó como casos de estudio las democracias que nacieron en Venezuela (1961), en España (1978) y en Chile (1991). La metodología utilizada para el desarrollo de la investigación fue la histórico-empírica de Dieter Nohlen y sus hallazgos revelan la complejidad de los procesos de democratización.
Low-energy effective theory and symmetry classification of flux phases on Kagome lattice
Creators: name: Feng, Xilin
name: Zhang, Yi
name: Jiang, Kun
name: Hu, Jiangping
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by recent experiments on AV$_3$Sb$_5$ (A=K,Rb,Cs), the chiral flux phase has been proposed to explain time-reversal symmetry breaking. To fully understand the physics behind the chiral flux phase, we construct a low-energy effective theory based on the van-Hove points around the Fermi surface. The possible symmetry-breaking states and their classifications of the low-energy effective theory are completely studied, especially the flux phases on Kagome lattice. In addition, we discuss the relations between the low-energy symmetry breaking orders, the chiral flux and charge bond orders. We find all possible 183 flux phases on Kagome lattice within 2*2 unit cell by brute-force approach and classify them by point group symmetry. Among the 183 phases, we find 3 classes in 1*1 unit cell, 8 classes in 1*2 unit cell and 18 classes in 2*2 unit cell, respectively. These results provide a full picture of the time-reversal symmetry breaking in Kagome lattices.
description: 10 pages, 11 figures
Neutron induced peaks in germanium detectors
Creators: name: Gete, Ermias
Publisher: name: University of British Columbia
Year: 2009

description: Peaks from fast and thermal neutron interactions in a HPGe detector have been studied using neutrons from 2C3f2, the rS21,ui8n() and the B2i(0ir,9n) reactions. In the latter case, it was possible to separate the neutron induced events using the TOF method. The peaks from (n,n’) interactions in the the detector crystal have a peculiar triangular shape of about 40 keV across due to the recoiling nucleus, The two ma jor prominent peaks at 596 and 691 keV corresponding to GTe(n4,n’) and G7e(n2,n’) have been studied for the above three neutron sources. The triangles have have been fitted to an exponential function to compare the peak shapes and a difference of less than 20 % has been observed between the three different cases. In addition, many peaks resulting from (n,-y) and (n,n’) reactions in the mate rials surrounding the detector have been observed and identified. The ‘-y-rays from 2C52f fission fragment isotopes and from the B2i0(79r ,xn) have also been analyzed and identified.
Quantum-based Mechanical Force Realization in Pico-Newton Range
Creators: name: Choi, Jae-Hyuk
name: Kim, Min-Seok
name: Park, Yon-Kyu
name: Choi, Mahn-Soo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose mechanical force realization based on flux quantization in the pico-Newton range. By controlling the number of flux quantum in a superconducting annulus, a force can be created as integer multiples of a constant step. For a 50 nm-thick Nb annulus with the inner and outer radii of 5 $μ$m and 10 $μ$m, respectively, and the field gradient of 10 T/m the force step is estimated to be 184 fN. The stability against thermal fluctuations is also addressed.
description: 5 pages; 4 figures