cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Βέλτιστη χωροθέτηση οχημάτων άμεσης επέμβασης στο Πολεοδομικό Συγκρότημα Θεσσαλονίκης: προσέγγιση βάσει γενετικού αλγόριθμου
Creators: name: Κωνσταντινίδου, Μαρία Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Πρότυπα χωροθέτησης μέγιστης κάλυψης
Γενετικοί αλγόριθμοι
Οχήματα άμεσης επέμβασης
Location models
Emergency vehicles
Maximal covering location problem
Genetic algorithms

description: Είναι γεγονός πως η πολυπλοκότητα του σύγχρονου αστικού περιβάλλοντος αποτελεί αιτία πρόκλησης μεγάλου αριθμού ατυχημάτων. Η αναγκαιότητα ταχείας επέμβασης σε τέτοιες περιπτώσεις προκύπτει από την επιθυμία περιορισμού των δυσμενών συνεπειών που αυτά συνεπάγονται ενώ ορισμένες φορές μπορεί να σηματοδοτήσει τη διαφορά μεταξύ ζωής και θανάτου. Κλειδί για την επίτευξη του παραπάνω στόχου αποτελεί η λειτουργία ενός δομημένου συστήματος άμεσης επέμβασης με κατάλληλη χωρική κατανομή. Σε αυτό το πλαίσιο, στην παρούσα διπλωματική εργασία εξετάζεται η χωροθέτηση οχημάτων άμεσης επέμβασης στο Πολεοδομικό Συγκρότημα Θεσσαλονίκης. Το πρότυπο που εφαρμόζεται αποτελεί μία ελαφρώς τροποποιημένη διατύπωση του Maximal Covering Location Problem (MCLP) ενώ η επίλυση πραγματοποιείται μέσω γενετικού αλγόριθμου. Μέσω της διαδικασίας επιδιώκεται η διερεύνηση της μεταβολής (αύξησης ή μείωσης) του ποσοστού της καλυπτόμενης ζήτησης ως αποτέλεσμα αλλαγών στις παραμέτρους του προβλήματος. Έτσι, είναι δυνατή η παροχή μιας εποπτικής εικόνας εναλλακτικών καταστάσεων στην εκάστοτε Αρμόδια Αρχή, με στόχο τη διευκόλυνση της λήψης αποφάσεων συναρτήσει τυχών περιορισμών και φυσικά του επιδιωκόμενου στόχου.
description: It is acknowledged that complexity of modern urban environment is the cause of numerous accidents. In such cases, the necessity of quick response derives from the will to reduce the severe consequences these entail and can sometimes make the difference between life and death. The key to the accomplishment of this target is the operation of a properly structured and sited emergency system. In this context, this thesis examines the emergency vehicle location problem in the Urban Complex of Thessaloniki. The model applied is a slightly modified formulation of the Maximal Covering Location Problem (MCLP) and the solution approach used is an embedded Genetic Algorithm. This examination aims to investigate the variance (increase or reduction) the percentage of demand coverage exhibits due to changes in the parameters’ values. In this way, it is possible to provide the Authority an overview of alternative solutions, with the intension of facilitating the decision making procedure, varying with respect to potential constraints and of course the pursued target.
Advertising: between economy and culture
Creators: name: Leslie, Deborah Ann
Publisher: name: University of British Columbia
Year: 2009

description: Advertising is an institution of economic, cultural and spatial regulation. This thesis examines the role of the advertising industry in mediating the geographies of markets and identities. In the same way that Stuart Ewen (1976) links the structure of the advertising industry in the 1920s to its role in the consolidation of national markets, mass consumption patterns and consumer identities congruent with Fordism, I tie the restructuring of the industry in the current period to the new regime of flexible accumulation. There is an increased need for information about consumers and a heightened design-intensity in flexible production. Institutions of power/knowledge such as advertising play an important role in linking production and consumption and in establishing a “just-in-time” consumption. In addition, through the process of “branding”, advertising agencies attach images to goods. Branding involves matching consumer identities with the “identities” of products. An important component of this process encompasses the formation of “brandscapes”, places where the product is sold and consumed. Advertising both responds to the location of consumers and situates consumers in space. At the same time that advertising has grown in importance, I find that the advertising industry is experiencing a crisis in the 1980s and 1990s. This crisis reflects a weakening of the industry’s ability to regulate the formation of markets and identities. The increasingly discontinuous and fluid spatial and temporal nature of consumer identities, combined with “reflexive modernization”, have made it increasingly difficult for advertisers to locate consumers in terms of both identity and space. In response to this crisis and under new conditions of flexible accumulation, U.S. agencies have reoriented both their organizational structure and their methods of operating. In terms of the reorganization of agencies themselves, I focus on two divergent tendencies in the 1980s and 1990s: the concentration! transnationalization of agencies on one hand, and the increased polarization/flexibility of agencies on the other. I draw upon trade journal literature and 55 interviews with employees. With respect to changing methods, I examine the role of agencies in processes of globalization, market segmentation and shifting gender identities. Increasingly sophisticated methods of monitoring consumers’ use of commodities, forms of resistance and places of consumption point to an escalation of surveillance in the current period. My thesis presents a contribution to debates over both flexibility and identity. I argue that the distinction between producer and consumer has become increasingly blurred, and that the two have come closer together at the site of advertising.
Variations of helioseismic parameters due to magnetic field generated by a flux transport model
Creators: name: Bi, Shaolan
name: Li, Tanda
name: Liu, Kang
name: Jiang, Jie
name: Li, Yaguang
name: Zhang, Jinghua
name: Zhang, Xianfei
name: Wu, Yaqian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The change of sound speed has been found at the base of the convection during the solar cycles, which can be used to constrain the solar internal magnetic field. We aim to check whether the magnetic field generated by the solar dynamo can lead to the cyclic variation of the sound speed detected through helioseismology. The basic configuration of magnetic field in the solar interior was obtained by using a Babcock-Leighton (BL) type flux transport dynamo. We reconstructed one-dimensional solar models by assimilating magnetic field generated by an established dynamo and examined their influences on the structural variables. The results show that magnetic field generated by the dynamo is able to cause noticeable change of the sound speed profile at the base of the convective zone during a solar cycle. Detailed features of this theoretical prediction are also similar to those of the helioseismic results in solar cycle 23 by adjusting the free parameters of the dynamo model.
description: accepted for publication in RAA (Res. Astron. Astrophys.)
Developing the GOTO telescope control system
Creators: name: Dyer, Martin J.
name: Dhillon, Vik S.
name: Littlefair, Stuart
name: Steeghs, Danny
name: Ulaczyk, Krzysztof
name: Chote, Paul
name: Lyman, Joseph
name: Galloway, Duncan K.
name: Ackley, Kendall
name: Mong, Yik Lun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Gravitational-wave Optical Transient Observer (GOTO) is a wide-field telescope project focused on detecting optical counterparts to gravitational-wave sources. The GOTO Telescope Control System (G-TeCS) is a custom robotic control system which autonomously manages the GOTO telescope hardware and nightly operations. Since the commissioning the GOTO prototype on La Palma in 2017, development of the control system has focused on the alert handling and scheduling systems. These allow GOTO to receive and process transient alerts and then schedule and carry out observations, all without the need for human involvement. GOTO is ultimately anticipated to include multiple telescope arrays on independent mounts, both on La Palma and at a southern site in Australia. When complete these mounts will be linked to form a single multi-site observatory, requiring more advanced scheduling systems to best optimise survey and follow-up observations.
description: 12 pages, 6 figures, 2 tables, submitted to SPIE Astronomical Telescopes + Instrumentation 2020
Recovering high-quality FODs from a reduced number of diffusion-weighted images using a model-driven deep learning architecture
Creators: name: Bartlett, J
name: Davey, C E
name: Johnston, L A
name: Duan, J
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Fibre orientation distribution (FOD) reconstruction using deep learning has the potential to produce accurate FODs from a reduced number of diffusion-weighted images (DWIs), decreasing total imaging time. Diffusion acquisition invariant representations of the DWI signals are typically used as input to these methods to ensure that they can be applied flexibly to data with different b-vectors and b-values; however, this means the network cannot condition its output directly on the DWI signal. In this work, we propose a spherical deconvolution network, a model-driven deep learning FOD reconstruction architecture, that ensures intermediate and output FODs produced by the network are consistent with the input DWI signals. Furthermore, we implement a fixel classification penalty within our loss function, encouraging the network to produce FODs that can subsequently be segmented into the correct number of fixels and improve downstream fixel-based analysis. Our results show that the model-based deep learning architecture achieves competitive performance compared to a state-of-the-art FOD super-resolution network, FOD-Net. Moreover, we show that the fixel classification penalty can be tuned to offer improved performance with respect to metrics that rely on accurately segmented of FODs. Our code is publicly available at https://github.com/Jbartlett6/SDNet .
description: 10 pages, 7 figures, This work has been submitted to the IEEE for possible publication
Investigating the Effect of Galaxy Interactions on AGN Enhancement at $0.5
Creators: name: Shah, Ekta A.
name: Kartaltepe, Jeyhan S.
name: Magagnoli, Christina T.
name: Cox, Isabella G.
name: Wetherell, Caleb T.
name: Vanderhoof, Brittany N.
name: Calabro, Antonello
name: Chartab, Nima
name: Conselice, Christopher J.
name: Croton, Darren J.
name: Donley, Jennifer
name: de Groot, Laura
name: de la Vega, Alexander
name: Hathi, Nimish P.
name: Ilbert, Olivier
name: Inami, Hanae
name: Kocevski, Dale D.
name: Koekemoer, Anton M.
name: Lemaux, Brian C.
name: Mantha, Kameswara Bharadwaj
name: Marchesi, Stefano
name: Martig, Marie
name: Masters, Daniel C.
name: McGrath, Elizabeth J.
name: McIntosh, Daniel H.
name: Moreno, Jorge
name: Nayyeri, Hooshang
name: Pampliega, Belen Alcalde
name: Salvato, Mara
name: Snyder, Gregory F.
name: Straughn, Amber N.
name: Treister, Ezequiel
name: Weston, Madalyn E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galaxy interactions and mergers are thought to play an important role in the evolution of galaxies. Studies in the nearby universe show a higher AGN fraction in interacting and merging galaxies than their isolated counterparts, indicating that such interactions are important contributors to black hole growth. To investigate the evolution of this role at higher redshifts, we have compiled the largest known sample of major spectroscopic galaxy pairs (2381 with $ΔV <5000$ km s$^{-1}$) at $0.5
description: Accepted for publication in ApJ, 28 pages, 15 figures
VIRTUAL MAKON VA UNING SHAXSDAGI TOBELIK XUSUSIYATLARI
Creators: name: O'zMU tayanch doktoranti Sayitova Umida Hikmatillo qizi
Publisher: name: Zenodo
Year: 2024

description: Yangi dunyoda texnologiyalar juda katta tezlik bilan rivojlanmoqda, telefon va kompyuterlarni oddiy, hatto zarur narsalarga aylanib bormoqda. Internetning afzalliklari haqida hamma biladi, aksariyat odamlar undan nafaqat ma’lumot qidirish, balki virtual olamga real muhitdan qochish uchun ham foydalanadilar. Virtual borliq - bu inson tomonidan telefon va kompyuter texnologiyalaridan foydalangan holda yaratilgan dunyo. Ular sizga haqiqiy hayotdan butunlay uzoqlashishga imkon beradi va o’ziga tobe qilib qoyadi va insonlar virtual dunyoning psixologik ta’siri xavfli bo‘lishi mumkinligini unutishadi. Bugungi kunda hayot muammolaridan qochib, boshqa dunyoga tushib ketishingizga imkon beradigan ko‘plab qurilmalar mavjud. Virtual dunyo tizimining rivojlanishi shu darajaga yetdiki, odam tom ma’noda ikkinchi dunyoda yashaydi, o‘zini virtual olamga to‘liq singdiradi. Virtual borliq bizga boshqa dunyoga tashrif buyurish, dam olish va muammolardan tanaffus qilish, shuningdek yangi hissiyotlarni olish imkoniyatini beradi, ammo uning salbiy tomonlari ham bor.
IVACS: Intelligent Voice Assistant for Coronavirus Disease (COVID-19) Self-Assessment
Creators: name: Dhakal, Parashar
name: Damacharla, Praveen
name: Javaid, Ahmad Y.
name: Vege, Hari K.
name: Devabhaktuni, Vijay K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: At the time of writing this paper, the world has around eleven million cases of COVID-19, scientifically known as severe acute respiratory syndrome corona-virus 2 (SARS-COV-2). One of the popular critical steps various health organizations are advocating to prevent the spread of this contagious disease is self-assessment of symptoms. Multiple organizations have already pioneered mobile and web-based applications for self-assessment of COVID-19 to reduce this global pandemic's spread. We propose an intelligent voice-based assistant for COVID-19 self-assessment (IVACS). This interactive assistant has been built to diagnose the symptoms related to COVID-19 using the guidelines provided by the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO). The empirical testing of the application has been performed with 22 human subjects, all volunteers, using the NASA Task Load Index (TLX), and subjects performance accuracy has been measured. The results indicate that the IVACS is beneficial to users. However, it still needs additional research and development to promote its widespread application.
Dynamical and gravitational lensing properties of a new phenomenological model of elliptical galaxies
Creators: name: Tortora, C.
name: Cardone, V. F.
name: Piedipalumbo, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent observations of the line of sight velocity profile of elliptical galaxies have furnished controversial results with some works favouring the presence of a large amount of dark matter in the outer regions and others arguing in favour of no dark matter at all. In order to shed new light on this controversy, we propose here a new phenomenological description of the total mass profile of galaxies. Under the hypothesis of spherical symmetry, we assume a double power-law expression for the global M/L ratio Upsilon(r)= Upsilon_0(r/r_0) ^{alpha}(1+r/r_0)^{beta}. In particular, Upsilon propto r^{alpha} for r/r_0<<1 so that alpha=0 mimics a constant M/L ratio in the inner regions, while, for (r/r_0>>1), Upsilon propto r^{alpha+beta} thus showing that models with alpha+beta=0 have an asymptotically constant M/L ratio. A wide range of possibilities is obtained by varying the slope parameters in the range we determine on the basis of physical considerations. Choosing a general expression for the luminosity density profile j(r), we work out an effective galaxy model that accounts for all the phenomenology observed in real elliptical galaxies. We derive the main dynamics and lensing properties of such an effective model. We analyze a general class of models, able to take into account different dynamical trends. We are able to obtain analytical expressions for the main dynamical and lensing quantities. We show that constraining the values of alpha+beta makes it possible to analyze the problem of the dark matter in elliptical galaxies. Indeed, positive values of alpha+beta would be a strong evidence for dark matter. Finally we indicate possible future approaches in order to face the observational data, in particular using velocity dispersion profiles and lensed quasar events.
description: 17 pages, 8 figures, accepted for publication on A&A
i-process nucleosynthesis: observational evidences from CEMP stars
Creators: name: Goswami, Partha Pratim
name: Goswami, Aruna
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The surface chemical compositions of a large fraction of Carbon-Enhanced Metal-Poor (CEMP) stars, the so-called CEMP-r/s stars, are known to exhibit enhancement of both s- and r-process elements. For these stars, the heavy element abundances cannot be explained either by s-process or r-process nucleosynthesis alone, as the production sites of s- and r-process elements are very different, and these two processes produce distinct abundance patterns. Thus, the observational evidence of the double enhancement seen in CEMP-r/s stars remains a puzzle as far as the origin of the elements is concerned. In this work, we have critically analysed the observed abundances of heavy elements in a sample of eight CEMP-r/s stars from literature, to trace the origin of the observed double enhancement. Towards this, we have conducted a parametric-model based analysis to delineate the contributions of s- and r-process nucleosynthesis to the observed elemental abundances. We have further examined if the i-process (intermediate process) nucleosynthesis, that occurs at a high neutron-density (n$\sim$10$^{15}$ cm$^{-3}$ ) produced during proton-ingestion from a H-rich envelope to the intershell region of an AGB star, that is capable of producing both r- and s-process elements in a single stellar site, could explain the observed abundance patterns of the sample stars. Our analysis shows that the observed abundance patterns of the selected sample of CEMP-r/s stars could be fairly well reproduced using the i-process model yields.
description: 8 pages, 2 figures, accepted for publication in Journal of Astrophysics and Astronomy (JAA)
Periodic orbit bifurcations and scattering time delay fluctuations
Creators: name: Keating, J. P.
name: de Almeida, A. M. Ozorio
name: Prado, S. D.
name: Sieber, M.
name: Vallejos, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We study fluctuations of the Wigner time delay for open (scattering) systems which exhibit mixed dynamics in the classical limit. It is shown that in the semiclassical limit the time delay fluctuations have a distribution that differs markedly from those which describe fully chaotic (or strongly disordered) systems: their moments have a power law dependence on a semiclassical parameter, with exponents that are rational fractions. These exponents are obtained from bifurcating periodic orbits trapped in the system. They are universal in situations where sufficiently long orbits contribute. We illustrate the influence of bifurcations on the time delay numerically using an open quantum map.
description: 9 pages, 3 figures, contribution to QMC2006
Monte-Carlo προσομοιώσεις με τη μέθοδο του Explosive percolation σε δίκτυα Erdos-Renyi:
Creators: name: Γιαζιτζίδης, Παρασκευάς Δαμιανού
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Διήθηση
Γράφος
Προσομοιώσεις
Percolation
Erdos-Renyi
Simulations

description: Η θεωρία του Percolation είναι ένα πολύ χρήσιμο μοντέλο για την μελέτη κρίσιμων φαινομένων, κατά το οποίο ένα σύστημα αποτελείται από δύο συστατικά τα οποία είναι τυχαία κατανεμημένα στον χώρο. Αυτή η τυχαία κατανομή δημιουργεί νησίδες του ενός συστατικού και το σύστημα υπόκειται σε αλλαγή φάσης, όταν η πυκνότητα του ενός συστατικού αυξηθεί. Στο κρίσιμο αυτό σημείο οι μικρές νησίδες ενώνονται και δημιουργούν μία η οποία διατρέχει το όλο το σύστημα. Εφαρμογές αυτής της θεωρίας μπορούμε να συναντήσουμε σε πορώδη ή μαγνητικά υλικά, αλλά και σε κοινωνικά δίκτυα, δίκτυα μεταφορών και στο internet. Το 2009, οι Achlioptas et al. πρότειναν μία νέα παραλλαγή της διαδικασίας, γνωστής ως ‘Achlioptas processes’, η οποία εισαγάγει έναν εναλλακτικό τρόπο συγκρότισης των νισήδων που βασίζεται σε έναν κανόνα που οδήγει σε ασυνεχείς μεταβάσεις. Στην παρούσα εργασία έγιναν Monte Carlo προσομοιώσεις σε δίκτυα με διάφορα μεγέθη (102 – 106 κόμβους) τόσο για το κλασσικό Percolation όσο και για τις ‘Achlioptas processes’ με σκοπό να συγκριθούν οι δύο διαφορατικού τύπου μεταβάσεις, και να διαχωριστούν με βάση συγκεκριμένα στατιστικά και μαθηματικά κριτήρια. Τα συμπεράσματα που εξήχθησαν θα συμβάλλουν στην εξέλιξη του μοντέλου, αλλά και στην περαιτέρω ανάπτυξη του πεδίου.
description: Percolation theory is a model that is very useful for studying critical phenomena. A percolating system is made of two components in a fixed specified ratio, which are randomly distributed in space. This random distribution generates nanoclusters whose size and frequency depend on a control parameter p, which is the concentration of one of the two components (obviously, the other one has concentration of 1-p). As p increases, the system undergoes through a phase transition characterized by the critical value of this control parameter, pc. At this point, the small nanoclusters merge to form a giant infinite cluster spanning the entire system from one end to the other. Recently it has been proposed by Achlioptas et al. a new type of percolation processes, known as Achlioptas processes. This new type is performed according to a product rule in a way that the spanning cluster formation is delayed, leading to an “explosive” rather than a smooth transition of the system at the critical point. In order to distinguish between the two types of transition, several ways are proposed. In this work, we used Monte Carlo simulations of networks with sizes from 102 to 106 and we apply the criteria proposed by Achlioptas et al. on Random Networks, and draw useful conclusions about their applicability. However, there are other possible ways for discriminating between the first and second-order transitions. Such is the criterion which uses the susceptibility of the size of the maximum cluster.
Ochre decor and Cinnabar Residues in Neolithic Pottery from Vinuca, Serbia
Creators: name: Mioc, Ubaska B.
name: Colomban, Philippe
name: Sagon, Gérard
name: Stojanovic, M.
name: Rosic, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The prehistoric site of Vinuca, on the right bank of the River Danube, the territory of the City of Belgrade, first excavated by Dr Miloje Vasić; (1931-1934) provides Neolithic pottery dating back to 5200 - 4200 B.C. Shards excavated in 1998 (Serbian Academy of Sciences and Arts) have a yellow coating on the external (convex) and red deposit on the internal (concave) side. Raman, IR and X-ray identification prove that yellow-to-red decor deposited on the external faces of pottery is made of ochre, a mixture of hematite, quartz and phyllosilicates. Red deposit, found on some internal surfaces of a pottery, consists of cinnabar (HgS) with some quartz and phyllosilicates. This indicates that cinnabar was not used for decor but for some other purposes, preparations made in ceramic utensils. A comparison is made with the mercury ore from a Suplja Stena mine located ~ 20 km from the Vinuca village.
Η Εκκοσμίκευση και η Εκκλησία κατά τον π. Αλέξανδρο Σμέμαν:
Creators: name: Hawk, Moses Richard (Μωυσής Χωκ)
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Σμέμαν
Εκκοσμίκευση
Λειτουργία
Schmemann
Secularism
Liturgy

description: Η παρούσα εργασία εξυπηρετεί δύο σκοπούς. Ο ένας είναι η απόπειρα να χυθεί φως στο πρόσωπο του πατρός Αλεξάνδρου Σμέμαν, του ορθοδόξου θεολόγου και αναμφισβήτητα ενός από τους πιο σημαντικούς θεολόγους του αγγλόφωνου κόσμου. Ο δεύτερος και πιο ωφέλιμος σκοπός είναι να αναλυθούν οι σκέψεις και οι διδασκαλίες του για την εκκοσμίκευση, ένα θέμα που συζητήθηκε επανειλημμένα στα έργα του και πιθανόν το μοναδικό πιο συνηθισμένο θέμα στην ποιμαντική θεολογία του. Ωστόσο, ο Σμέμαν δε «συζητά» απλώς το θέμα ούτε η παρούσα εργασία το αγγίζει επιφανειακά. Πίστευε ότι δεν ωφελεί η απλή συζήτηση για το θέμα αν δεν υπήρχε μία σχετική απάντηση ή λύση. Επιπρόσθετα, στην παρούσα θα καταγραφεί η απάντηση του Σμέμαν στην εκκοσμίκευση, δηλαδή, πώς ο χριστιανός μπορεί να ξεπεράσει αυτό το μεγάλο κακό αντί να το αγνοήσει απλώς, κάτι που, όπως θα συζητήσουμε παρακάτω, αποτελεί μεγάλη ζημιά για τη χριστιανική ζωή.
description: There are two purposes to this thesis. One is to try and shed some light on the person of Fr. Alexander Schmemann, the Orthodox theologian, and arguably one of the most influential theologians of the English-speaking world. The second, and more beneficial, is to analyze his thoughts and teachings about secularism, a topic that is repeatedly discussed in his works and likely the single most common theme in his pastoral theology. However, Schmemann does not simply “discuss” the topic, nor will this paper do such. He believed it to be of no benefit to simply talk about the matter if there were not an answer or cure at hand. Here too will be presented Schmemann’s answer to secularism, that is, how the Christian can overcome this great evil instead of simply ignoring it, which – as will be discussed – is of great detriment to the Christian life.
The strongly driven Fermi polaron
Creators: name: Vivanco, Franklin J.
name: Schuckert, Alexander
name: Huang, Songtao
name: Schumacher, Grant L.
name: Assumpção, Gabriel G. T.
name: Ji, Yunpeng
name: Chen, Jianyi
name: Knap, Michael
name: Navon, Nir
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quasiparticles are emergent excitations of matter that underlie much of our understanding of quantum many-body systems. Therefore, the prospect of manipulating their properties with external fields -- or even destroying them -- has both fundamental and practical implications. However, in solid-state materials it is often challenging to understand how quasiparticles are modified by external fields owing to their complex interplay with other collective excitations, such as phonons. Here, we take advantage of the clean setting of homogeneous quantum gases and fast radio-frequency control to manipulate Fermi polarons -- quasiparticles formed by impurities interacting with a non-interacting Fermi gas -- from weak to ultrastrong drives. Exploiting two internal states of the impurity species, we develop a steady-state spectroscopy, from which we extract the energy of the driven polaron. We measure the decay rate and the quasiparticle residue of the driven polaron from the Rabi oscillations between the two internal states. At large drive strengths, the so-extracted quasiparticle residue exceeds unity, raising intriguing questions on the relationship between the Rabi oscillations and the impurity's spectral functions. Our experiment establishes the driven Fermi polaron as a promising platform for studying controllable quasiparticles in strongly driven quantum matter.
Cooling to the Ground State of Axial Motion for One Atom Strongly Coupled to an Optical Cavity
Creators: name: Boozer, A. D.
name: Boca, A.
name: Miller, R.
name: Northup, T. E.
name: Kimble, H. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Localization to the ground state of axial motion is demonstrated for a single, trapped atom strongly coupled to the field of a high finesse optical resonator. The axial atomic motion is cooled by way of coherent Raman transitions on the red vibrational sideband. An efficient state detection scheme enabled by strong coupling in cavity QED is used to record the Raman spectrum, from which the state of atomic motion is inferred. We find that the lowest vibrational level of the axial potential with zero-point energy 13uK is occupied with probability P0~0.95.
description: 5 pages, 4 figures
Study of medium modified jet shape observables in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV using EPOS and JEWEL event generators
Creators: name: Saha, Sumit Kumar
name: Sarkar, Debojit
name: Chattopadhyay, Subhasis
name: Sheikh, Ashik Ikbal
name: Prasad, Sidharth Kumar
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The jet-medium interaction in high energy heavy ion collisions is an important phenomena to characterize the hot and dense medium produced in such collisions. The study of medium-induced modifications to the substructure of inclusive charged jets indicates a redistribution of energy inside the jet cone and provides insight into the energy loss mechanisms of jets in the medium. We investigate the in-medium modification to two jet shape observables i.e., the differential jet shape ($ρ$(r)) and the angularity (g) in the most central $Pb-Pb$ collisions at $\sqrt{s_{NN}} ~=~ 2.76 $ TeV using two commonly used event generators i.e., JEWEL (recoil OFF) and EPOS-3 in the jet-p$_T$ range of 20-40 GeV/c. JEWEL with recoil OFF has been used primarily as a reference system as that has been found to explain the global jet observables satisfactorily but lacks in jet-shape variables at higher jet-radii. EPOS-3 that explains the bulk properties in such collisions quite well takes into account a hydrodynamically evolving bulk matter, jets and hard-soft interactions. A comparison between the results from these models shows that while JEWEL (recoil OFF) does not explain the distribution of lost energy at higher radii with respect to the jet-axis, EPOS-3 explains the effect quite well. However, in EPOS-3, the partonic energy loss mechanism and secondary hard-soft interactions during hadronization and hadronic cascade phase are different from the conventional jet energy loss models. The current study can, therefore, provide important new insights on mechanisms regarding the modeling of the medium and hard-soft interactions in heavy ion collisions.
description: Published in Nuclear Physics A
Στοχαστικά και προσδιοριστικά επιδημικά μοντέλα:
Creators: name: Λύτρα, Ελένη Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Επιδημικά μοντέλα
Μετανάστευση
Epidemic models
Immigration

description: Οι επιδημίες είναι εξάρσεις μολυσματικών ή μεταδοτικών ασθενειών που εμφανίζονται σε έναν ανθρώπινο πληθυσμό και δεδομένη χρονική περίοδο σε βαθμό μεγαλύτερου του αναμενόμενου. Τα τελευταία χρόνια υπάρχει ένα αυξανόμενο ενδιαφέρον τόσο στην ανάπτυξη όσο και στη χρήση επιδημικών μοντέλων.Στην εργασία αυτή επικεντρωνόμαστε στη μελέτη των στοχαστικών και των προσδιοριστικών επιδημικών μαθηματικών προτύπων. Αναλύεται το μαθηματικό μοντέλο της ευαισθησίας και διατυπώνεται ο βασικός αριθμός αναπαραγωγής. Με βάση το απλό επιδημικό SI μοντέλο παρουσιάζουμε έντεκα ακόμα είδη επιδημικών αιτιοκρατικών μοντέλων. Στο δεύτερο κεφάλαιο αναπτύσσεται ο ρόλος του εμβολιασμού και της μετανάστευσης στη δυναμική των ασθενειών.Εστιάζουμε στα πρότυπα SIS και SIR με μια εμβολιασμένη τάξη. Για το στοχαστικό απλό επιδημικό SI μοντέλο παράγουμε πιθανογεννήτριες και χρησιμοποιούμε διαφορικές εξισώσεις με μερικές παραγώγους. Τέλος προσθέτουμε στην διαδικασία αυτή μια προληπτική καραντίνα. Στο τρίτο κεφάλαιο διατυπώνονται τρεις τύποι στοχαστικών προτύπων. Οι διαδικασίες αυτές διαφέρουν στις υποθέσεις ως προς το χρόνο και την κατάσταση των μεταβλητών. Το κεφάλαιο τελειώνει με δύο άλλους τύπους επιδημικών προτύπων, τα διωνυμικά μοντέλα και τις κλαδωτές διαδικασίες.Στο τέταρτο και τελευταίο κεφάλαιο παρουσιάζονται τρεις εφαρμογές στο πρόγραμμα Matlab για να παράγουμε δειγματικά μονοπάτια και την πιθανότητα κατανομής για το στοχαστικό SIS επιδημικό μοντέλο.
description: Epidemics are elations of contagious or contagious diseases that are presented in a human population and given time period in degree bigger than the expected. In the past few years, there has been an increasing interest not only in the field of growth but also in the use of epidemic models.In this work we are focused in the study of the stochastic and deterministic epidemic mathematical models. The mathematic model of sensitivity is analyzed and the basic number of reproduction is formulated. Based on the simple epidemic SI model we present eleven other types of deterministic epidemic models. In the second chapter, the role of vaccination and immigration of disease dynamics is developed. We focus on SIS and SIR models with a vaccinated class. For the stochastic simple epidemic SI model we produce probability generating functions and we use partial differential equations. Finally we add in this process a preventive quarantine. In the third chapter, three types of stochastic models are formulated. These processes differ in the underlying assumptions regarding the time and the state variables. The capital finishes with two other types of epidemic models, the chain binomial models and the branching processes.In the fourth and last chapter we use Matlab program to generate three sample paths and the probability distribution associated with the stochastic SIS epidemic model.
Pion production and absorption in heavy-ion collisions
Creators: name: Gao, Yuan
name: Zhang, Lei
name: Yong, Gao-Chan
name: Liu, Zi-Yu
name: Zuo, Wei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Based on the isospin dependent transport model IBUU, the pion production and its absorption are thoroughly studied in the central collision of $Au+Au$ at a beam energy of 400 MeV/nucleon. It is found that the pions are firstly produced by the hard $Δ$ decay at the average density around $1.75ρ_{0}$, whereas about 18\% of them are absorbed absolutely in the subsequent inelastic collisions. For the free pions observed, more than half of them have been scattered for one or more times before they are free from matter. And the more scattering numbers of pions, the higher the momentum they possess. These pions, due to longer time of their existence in high density nuclear matter, carry more information about the symmetry energy of the nuclear matter at high densities.
description: 6 pages, 8 figures
EDGE: Two routes to dark matter core formation in ultra-faint dwarfs
Creators: name: Orkney, Matthew D. A.
name: Read, Justin I.
name: Rey, Martin P.
name: Nasim, Imran
name: Pontzen, Andrew
name: Agertz, Oscar
name: Kim, Stacy Y.
name: Delorme, Maxime
name: Dehnen, Walter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In the standard Lambda cold dark matter paradigm, pure dark matter simulations predict dwarf galaxies should inhabit dark matter haloes with a centrally diverging density `cusp'. This is in conflict with observations that typically favour a constant density `core'. We investigate this `cusp-core problem' in `ultra-faint' dwarf galaxies simulated as part of the `Engineering Dwarfs at Galaxy formation's Edge' (EDGE) project. We find, similarly to previous work, that gravitational potential fluctuations within the central region of the simulated dwarfs kinematically heat the dark matter particles, lowering the dwarfs' central dark matter density. However, these fluctuations are not exclusively caused by gas inflow/outflow, but also by impulsive heating from minor mergers. We use the genetic modification approach on one of our dwarf's initial conditions to show how a delayed assembly history leads to more late minor mergers and, correspondingly, more dark matter heating. This provides a mechanism by which even ultra-faint dwarfs ($M_* < 10^5\,\text{M}_{\odot}$), in which star formation was fully quenched at high redshift, can have their central dark matter density lowered over time. In contrast, we find that late major mergers can regenerate a central dark matter cusp, if the merging galaxy had sufficiently little star formation. The combination of these effects leads us to predict significant stochasticity in the central dark matter density slopes of the smallest dwarfs, driven by their unique star formation and mass assembly histories.
description: 14 pages, 13 figures, submitted to MNRAS
Ferrimagnetism Induced by Off-Site Coulomb Interaction in an Itinerant Electron System
Creators: name: Aizawa, Hirohito
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by weak ferromagnetism (FM) in a $τ$-type molecular conductor ($τ$-MC), we examine its mechanism using a two-band extended Hubbard model. Applying the random phase approximation, we elucidate the uniform spin and charge fluctuations between unit cells in the presence of on-site and off-site interactions. Applying the mean-field approximation, we find the ordered state mixing with antiferromagnetism (AFM), weak FM, and charge ordering (CO) components in each unit cell: we classify this state as ferrimagnetism (FIM). We reveal the phase diagrams in the interaction and interaction-temperature spaces. The former shows that the off-site interaction induces FIM from pure AFM and the latter shows that lowering the temperature stabilizes FIM. To clarify the stabilization mechanism of the phases, we focus on the microscopic nature of the ordered states, including the band structure, Fermi surface, and density of states. We find that the FIM state is obtained from mixing features of AFM, CO, and FM; therefore, the emergence of FIM requires both the on-site and off-site interactions. Then, we discuss the effect of lowering the temperature and predict that the AFM gap assists the emergence of FIM based on AFM. This FIM state is possibly related to the observation of the weak FM in $τ$-MC.
description: 7 pages, 7 figures, accepted for publication in Journal of the Physical Society of Japan
Η Συμβολή της τρισδιάστατης απεικόνισης (3D) στην Εκτίμηση και Διαχείριση Εμπορικών Ακινήτων:
Creators: name: Γιαννουλάκης, Στέφανος Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Τρισδιάστατη απεικόνιση
Εκτίμηση και διαχείριση εμπορικών ακινήτων
Ταμειακές ροές
3d visualization
Commercial real estate valuation and management
Cash flows

description: Η παρούσα Διπλωματική Εργασία με τίτλο «Η Συμβολή της τρισδιάστατης απεικόνισης (3D) στην Εκτίμηση και Διαχείριση Εμπορικών Ακινήτων» εκπονήθηκε στα πλαίσια του προγράμματος μεταπτυχιακών σπουδών με τίτλο «Κτηματολόγιο & Διαχείριση Χωρικών Δεδομένων» της κατεύθυνσης «Τεχνικές και Μέθοδοι στην Ανάλυση, Σχεδίαση & Διαχείριση του Χώρου» του Τμήματος Αγρονόμων και Τοπογράφων Μηχανικών, της Πολυτεχνικής Σχολής, του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης.Σκοπός της συγκεκριμένης μεταπτυχιακής διατριβής, είναι η τρισδιάστατη ανάλυση, εκτίμηση και διαχείριση εμπορικών ακινήτων με τη χρήση ενός μοντέλου προσομοίωσης σε τρισδιάστατο περιβάλλον, ενσωματώνοντας σύγχρονες εκτιμητικές μεθόδους, και κάποια από τα πλεονεκτήματα που απορρέουν από τις υπηρεσίες Geomarketing και GIS. Απώτερος στόχος της ερευνητικής μελέτης είναι η κατανόηση σύγχρονων εργαλείων προς αρωγή στον σχεδιασμό, ανάλυση και αναπαράσταση του χώρου, με απώτερο σκοπό μιας πιο ολοκληρωμένης περιγραφής και ολιστικής προσέγγισης του χώρου στο αντικείμενο του real estate. Τα εργαλεία αυτά, έρχονται να καλύψουν τις ανάγκες του εκτιμητή μηχανικού και να απαντήσουν στα προβλήματα που θέτει η σύγχρονη επιστήμη και η ραγδαία ανάπτυξη του χώρου των ακινήτων, της εκτίμησης αξιών γης και των επενδύσεων, καθώς και να δημιουργήσουν μια συμπληρωματική γωνία θέασης και προσέγγισης ως προς τον την χωρική αντίληψη, ανάλυση και εκτίμηση.
description: The present Diploma Thesis titled as “The Contribution of 3D visualization in Commercial Real Estate Valuation and Management” was worked out in the frames of the curriculum of postgraduate studies on “Cadastre and Spatial Analysis”, in the department of “Techniques and Methods in Spatial Analysis, Planning and Management”, in the School of Rural and Surveying Engineering (RSE) in Polytechnic Faculty, of Aristotle University of Thessaloniki. Aim of this diploma thesis, is the three-dimensional analysis, appraisal and management of commercial real estate, with the use of simulation model in three-dimensional environment, by incorporating modern valuation techniques and some of the advantages that derive from the services through Geomarketing and GIS. Main objective of the inquiring study is the comprehension of modern tools which contribute in the planning, analysis and representation of space, with final aim the most completed description and precise approach of real estate. These scientific tools, not only are able to cover the needs of valuation and development and give effective answers to problems that science and the rapid real estate development face with, but also may create an additional perspective and approach in spatial perception, analysis and valuation.
A quantum violation of the second law?
Creators: name: Ford, G. W.
name: O'Connell, R. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An apparent violation of the second law of thermodynamics occurs when an atom coupled to a zero-temperature bath, being necessarily in an excited state, is used to extract work from the bath. Here the fallacy is that it takes work to couple the atom to the bath and this work must exceed that obtained from the atom. For the example of an oscillator coupled to a bath described by the single relaxation time model, the mean oscillator energy and the minimum work required to couple the oscillator to the bath are both calculated explicitly and in closed form. It is shown that the minimum work always exceeds the mean oscillator energy, so there is no violation of the second law.
Neutron Skin Thickness of 90Zr Determined By Charge Exchange Reactions
Creators: name: Yako, K.
name: Sagawa, H.
name: Sakai, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Charge exchange spin-dipole (SD) excitations of 90Zr are studied by the 90Zr(p,n) and 90Zr(n,p) reactions at 300 MeV. A multipole decomposition technique is employed to obtain the SD strength distributions in the cross section spectra. For the first time, a model-independent SD sum rule value is obtained: 148+/-12 fm^2. The neutron skin thickness of 90Zr is determined to be 0.07+/-0.04 fm from the SD sum rule value.
description: 4 pages, 2 figures, submitted to Phys. Rev. C
The Large and Small Scale Structures of Dust in the Star-Forming Perseus Molecular Cloud
Creators: name: Kirk, Helen
name: Johnstone, Doug
name: Di Francesco, James
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an analysis of ~3.5 square degrees of submillimetre continuum and extinction data of the Perseus molecular cloud. We identify 58 clumps in the submillimetre map and we identify 39 structures (`cores') and 11 associations of structures (`super cores') in the extinction map. The cumulative mass distributions of the submillimetre clumps and extinction cores have steep slopes (alpha ~ 2 and 1.5 - 2 respectively), steeper than the Salpeter IMF (alpha = 1.35), while the distribution of extinction super cores has a shallow slope (alpha ~ 1). Most of the submillimetre clumps are well fit by stable Bonnor-Ebert spheres with 10K < T < 19K and 5.5 < log_10(P_ext/k) < 6.0. The clumps are found only in the highest column density regions (A_V > 5 - 7 mag), although Bonnor-Ebert models suggest that we should have been able to detect them at lower column densities if they exist. These observations provide a stronger case for an extinction threshold than that found in analysis of less sensitive observations of the Ophiuchus molecular cloud. The relationship between submillimetre clumps and their parent extinction core has been analyzed. The submillimetre clumps tend to lie offset from the larger extinction peaks, suggesting the clumps formed via an external triggering event, consistent with previous observations.
description: 38 pages, 12 figures, accepted by Astrophysical Journal slight changes to original due to a slight 3" error in the coordinates of the SCUBA map
On meta-stable SQCD with adjoint matter and gauge mediation
Creators: name: Amariti, A.
name: Girardello, L.
name: Mariotti, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We briefly review our analysis of a model with non supersymmetric vacua in N=1 gauge theories with adjoint matter and no R-symmetry. We show here that this model without any modification fits into a direct gauge mediation scenario and leads to massive gauginos.
description: 8 pages, minor comments and references added
title: Ð¡Ð¾Ð²ÑÐµÐ¼ÐµÐ½Ð½Ð¾Ðµ Ð¾Ð±ÑÐµÑÑÐ²Ð¾ â ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ðµ, Ð¿ÑÐ¾Ð³Ð½Ð¾Ð·Ñ Ð¸ Ð¿ÐµÑÑÐ¿ÐµÐºÑÐ¸Ð²Ñ (ÑÑÑÐ¸Ñ Ð¸ Ðº Ð¼ÐµÐ³Ð°ÑÑÐµÐ½Ð´Ð°Ð¼ 2020-Ñ )
title: Modern society â state, forecasts and prospects (touches to the megatrends of the 2020s)
Creators: name: ÐÐµÐ»Ð¸ÑÐºÐ¾, ÐÐ°Ð²ÐµÐ»
name: ÐÐµÐ»Ð¸ÑÐºÐ¾, ÐÐ»Ð¸Ð·Ð°Ð²ÐµÑÐ°
name: "Ð¡Ð¸ÑÑÐµÐ¼Ð½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð· Ð² Ð¿ÑÐ¾ÐµÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ð¸ Ð¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ð¸", Ð¼ÐµÐ¶Ð´ÑÐ½Ð°ÑÐ¾Ð´Ð½Ð°Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ°Ñ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ñ (27; 2023; Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³)
Publisher: name: ÐÐÐÐÐ¢ÐÐ¥-ÐÐ ÐÐ¡Ð¡
Year: 2024
Subjects: ÐÑÐºÑÑÑÑÐ²ÐµÐ½Ð½ÑÐ¹ Ð¸Ð½ÑÐµÐ»Ð»ÐµÐºÑ
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Ð¼ÐµÐ³Ð°ÑÑÐµÐ½Ð´Ñ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ñ Ð¾Ð±ÑÐµÑÑÐ²Ð°
multipolar world
resources
security
currencies
technologies
megatrends of society development

description: Ð ÑÑÐ°ÑÑÐµ Ð¿ÑÐ¾Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ñ ÑÐ°ÐºÑÐ¾ÑÑ, ÑÐ¾ÑÐ¼Ð¸ÑÑÑÑÐ¸Ðµ Ð¼ÐµÐ³Ð°ÑÑÐµÐ½Ð´Ñ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ñ ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð¾Ð±ÑÐµÑÑÐ²Ð°. ÐÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ð° ÐºÐ¾Ð³Ð½Ð¸ÑÐ¸Ð²Ð½Ð°Ñ ÐºÐ°ÑÑÐ°, Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÑÑÑÐ°Ñ Ð²Ð·Ð°Ð¸Ð¼Ð¾ÑÐ²ÑÐ·Ð¸ Ð¼ÐµÐ¶Ð´Ñ Ð²ÑÐ´ÐµÐ»ÐµÐ½Ð½ÑÐ¼Ð¸ ÑÐ°ÐºÑÐ¾ÑÐ°Ð¼Ð¸.
description: The article analyzes the factors that form the megatrends of the development of modern society. A cognitive map representing the interrelationships between the selected factors is proposed.