cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Engineering vortex rings and systems for controlled studies of vortex interactions in Bose-Einstein condensates
Creators: name: Ruostekoski, J.
name: Dutton, Z.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study controlled methods of preparing vortex configurations in atomic Bose-Einstein condensates and their use in the studies of fundamental vortex scattering, reconnection processes and superfluid sound emission. We explore techniques of imprinting closed vortex rings by means of coherently driving internal atomic transitions with electromagnetic fields which exhibit singular phase profiles. In particular, we show that a vortex ring can be prepared in a controlled way by two focused co-propagating Gaussian laser beams. More complex vortex systems may also be imprinted by directly superposing simpler field configurations or by programming their phase profiles on optical holograms. This provides the controlled method of studying vortex reconnections in atomic superfluids. We analyze specific examples of two merging vortex rings in a trapped two-component Rb-87 condensate. We calculate the radiated sound energy in the vortex ring reconnection process and show that the vortex relaxation and the re-distribution of sound energy can be controlled by the imprinting process. The energy is first concentrated towards the trap center and later emitted outwards as sound and transformed to surface excitations. As another such technique, we study creating pairs of 2D point vortices in Bose-Einstein condensates using a 'light roadblock' in ultra-slow light propagation. We show how this can be used to study vortex collisions in compressible superfluids and how these collisions result in energy dissipation via phonons and, sometimes, annihilation of vortex pairs.
description: 14 pages
Additive Manufacturing of Compositionally-Graded AISI 316L to CoCrMo Structures by Directed Energy Deposition
Creators: name: Sommer, Niklas
name: Kluge, Philipp
name: Stredak, Florian
name: Eigler, Sascha
name: Hill, Horst
name: Niendorf, Thomas
name: Böhm, Stefan
Publisher: name: Universität Kassel
Year: 2021
Subjects: subject: additive manufacturing
subject: directed energy deposition
subject: compositionally-graded materials
subject: functionally-graded materials
subject: mechanical properties
subject: microstructural evolution
subject: computational material science
subject: 600
subject: Rapid Prototyping
subject: Direct Energy Deposition
subject: Mechanische Eigenschaft
subject: Funktioneller Gradientenwerkstoff
subject: Mikrostruktur

description: Gefördert durch den Publikationsfonds der Universität Kassel
Anomalous scaling of passive scalar in turbulence and in equilibrium
Creators: name: Falkovich, Gregory
name: Fouxon, Alexander
Publisher: name: arXiv
Year: 2005
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We analyze multi-point correlation functions of a tracer in an incompressible flow at scales far exceeding the scale $L$ at which fluctuations are generated (quasi-equilibrium domain) and compare them with the correlation functions at scales smaller than $L$ (turbulence domain). We demonstrate that the scale invariance can be broken in the equilibrium domain and trace this breakdown to the statistical integrals of motion (zero modes) as has been done before for turbulence. Employing Kraichnan model of short-correlated velocity we identify the new type of zero modes, which break scale invariance and determine an anomalously slow decay of correlations at large scales.
FEATURES OF IMPROVING THE PROFESSIONAL COMPETENCE OF PRE-SCHOOL EDUCATIONAL ORGANIZATION LEADERS
Creators: name: Kurbanov, Ibratbek
Publisher: name: Zenodo
Year: 2024

description: The article examines the problems of improving the professional competence of the heads of preschool education organizations, and the experience of working on the formation of the professional competence of young heads through the implementation of the methodical support model is presented. The stages of formation of professional competence are disclosed.
Population of closed-channel molecules in trapped Fermi gases with broad Feshbach resonances
Creators: name: Chen, Qijin
name: Levin, K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We compute the fraction of closed-channel molecules in trapped atomic Fermi gases, over the entire range of accessible fields and temperatures. We use a two-channel model of BCS--Bose-Einstein condensation (BEC) crossover theory at general temperature $T$, and show that this fraction provides a measure of the $T$ dependent pairing gap. Our calculations, containing no free parameters, are in good quantitative agreement with recent low $T$ measurements in $^6$Li. We present readily testable predictions for the dependencies of the closed-channel fraction on temperature and Fermi momentum.
description: 4 pages, 3 figures, published in PRL
Efficient one-pot synthesis, molecular docking and in silico ADME prediction of bis-(4-hydroxycoumarin-3-yl) methane derivatives as antileishmanial agents
Creators: name: Zaheer, Zahid
name: Khan, Firoz A. Kalam
name: Sangshetti, Jaiprakash N.
name: Patil, Rajendra H.
Publisher: name: Technische Universität Dortmund
Year: 2015
Subjects: subject: antileishmanial activity
subject: Leishmania donovani promastigotes
subject: molecular docking study
subject: ADME properties
subject: drug likeness
subject: drug score
subject: 610

description: Bis-(4-hydroxycoumarin-3-yl) methane derivatives 3(a-l) were synthesized from 4-hydroxycoumarin and substituted aromatic aldehydes using succinimide-N-sulfonic acid as catalyst and evaluated for their in vitro antileishmanial activity against promastigotes form of Leishmania donovani. Compounds 3a (IC50= 155 μg/mL), 3g (IC50= 157.5 μg/mL) and 3l (IC50= 150 μg/mL) were shown significant antileishmanial activity when compared with standard sodium stibogluconate (IC50= 490 μg/mL). Also, synthesized compounds 3(a-l) did not show cytotoxicity against HeLa cell line upto tested concentrations. Further, molecular docking study against Adenine phosphoribosyltransferase of Leishmania donovani showed good binding interactions. ADME properties were analyzed and showed good oral drug candidate like properties. The synthesized compounds were also shown good drug likeness and drug score values when compared with drugs currently used in therapy. The present study has helped us in identifying a new lead that could be exploited as a potential antileishmanial agent.
description: EXCLI Journal;Vol. 14, 2015
Classification of P-glycoprotein-interacting compounds using machine learning methods
Creators: name: Prachayasittikul, Veda
name: Worachartcheewan, Apilak
name: Shoombuatong, Watshara
name: Prachayasittikul, Virapong
name: Nantasenamat, Chanin
Publisher: name: Technische Universität Dortmund
Year: 2015
Subjects: subject: P-glycoprotein
subject: ADMET
subject: multidrug resistance
subject: QSAR
subject: data mining
subject: 610

description: P-glycoprotein (Pgp) is a drug transporter that plays important roles in multidrug resistance and drug pharmacokinetics. The inhibition of Pgp has become a notable strategy for combating multidrug-resistant cancers and improving therapeutic outcomes. However, the polyspecific nature of Pgp, together with inconsistent results in experimental assays, renders the determination of endpoints for Pgp-interacting compounds a great challenge. In this study, the classification of a large set of 2,477 Pgp-interacting compounds (i.e., 1341 inhibitors, 913 noninhibitors, 197 substrates and 26 non-substrates) was performed using several machine learning methods (i.e., decision tree induction, artificial neural network modelling and support vector machine) as a function of their physicochemical properties. The models provided good predictive performance, producing MCC values in the range of 0.739-1 for internal cross-validation and 0.665-1 for external validation. The study provided simple and interpretable models for important properties that influence the activity of Pgp-interacting compounds, which are potentially beneficial for screening and rational design of Pgp inhibitors that are of clinical importance.
description: EXCLI Journal;Vol. 14, 2015
title: Εισαγωγή στα προσωπικά δεδομένα στον τομέα της υγείας
title: Introduction to personal data in the field of health
titleType: AlternativeTitle
Creators: name: Τσαγκρασούλη, Ελισσάβετ
name: Tsagkrasouli, Elisabeth
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: GDPR
subject: Προσωπικά δεδομένα
subject: Προστασία δεδομένων
subject: Ψηφιακή υγεία

description: Σκοπός της παρούσης μελέτης είναι να διερευνήσει την ηλεκτρονική επεξεργασία των προσωπικών δεδομένων στο χώρο της υγείας. Η μεθοδολογία της εργασίας στηρίχθηκε στη συλλογή δευτερογενών δεδομένων μέσα από βιβλία και άρθρα σε περιοδικά. Η μελέτη κατέληξε στο συμπέρασμα πως οι εξαιρέσεις από την έρευνα στον τομέα της προστασίας δεδομένων θα πρέπει να επιτρέπουν τη δημιουργία ενός κανονιστικού πλαισίου, στο οποίο θα μπορούν να λαμβάνονται υπόψη οι ιδιαιτερότητες της χρήσης των ευαίσθητων προσωπικών δεδομένων στην ιατρική έρευνα. Ωστόσο, απαιτείται περαιτέρω διεπιστημονική έρευνα προκειμένου να καθοριστεί πότε η μετάβαση από τη συγκατάθεση ως νομική βάση είναι απαραίτητη και αναλογική σε ένα πλαίσιο ιατρικής έρευνας εντάσεως δεδομένων και ποια τεχνολογικά και διαχειριστικά μέτρα θα πρέπει να εφαρμοστούν όταν μία τέτοια εξαίρεση από τη συγκατάθεση παρέχεται στην έρευνα.
PiRank: Scalable Learning To Rank via Differentiable Sorting
Creators: name: Swezey, Robin
name: Grover, Aditya
name: Charron, Bruno
name: Ermon, Stefano
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: A key challenge with machine learning approaches for ranking is the gap between the performance metrics of interest and the surrogate loss functions that can be optimized with gradient-based methods. This gap arises because ranking metrics typically involve a sorting operation which is not differentiable w.r.t. the model parameters. Prior works have proposed surrogates that are loosely related to ranking metrics or simple smoothed versions thereof, and often fail to scale to real-world applications. We propose PiRank, a new class of differentiable surrogates for ranking, which employ a continuous, temperature-controlled relaxation to the sorting operator based on NeuralSort [1]. We show that PiRank exactly recovers the desired metrics in the limit of zero temperature and further propose a divide and-conquer extension that scales favorably to large list sizes, both in theory and practice. Empirically, we demonstrate the role of larger list sizes during training and show that PiRank significantly improves over comparable approaches on publicly available internet-scale learning-to-rank benchmarks.
Tidal disruption of dark matter halos around proto-globular clusters
Creators: name: Saitoh, Takayuki R.
name: Koda, Jin
name: Okamoto, Takashi
name: Wada, Keiichi
name: Habe, Asao
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Tidal disruption of dark matter halos around proto-globular clusters in a halo of a small galaxy is studied in the context of the hierarchical clustering scenario by using semi-cosmological N-body/SPH simulations assuming the standard cold dark matter model ($Ω_0 = 1$). Our analysis on formation and evolution of the galaxy and its substructures archives until $z = 2.0$. In such a high-redshift universe, the Einstein-de Sitter universe is still a good approximation for a recently favored $Λ$-dominated universe, and then our results does not depend on the choice of cosmology. In order to resolve small gravitationally-bound clumps around galaxies and consider radiative cooling below $T = 10^4 K$, we adopt a fine mass resolution ($m_{\rm SPH} = 1.12 \times 10^3 \Msun$). Because of the cooling, each clump immediately forms a `core-halo' structure which consists of a baryonic core and a dark matter halo. The tidal force from the host galaxy mainly strips the dark matter halo from clumps and, as a result, theses clumps get dominated by baryons. Once a clump is captured by the host halo, its mass drastically decreases each pericenter passage. At $z = 2$, more than half of the clumps become baryon dominated systems (baryon mass/total mass $> 0.5$). Our results support the tidal evolution scenario of the formation of globular clusters and baryon dominated dwarf galaxies in the context of the cold dark matter universe.
description: 9page, 13 figures. Accepted for publication in ApJ. A high-resolution PDF of the paper can be obtained from http://th.nao.ac.jp/~takayuki/ApJ05/
Chemical profile and antioxidant capacity verification of Psidium guajava (Myrtaceae) fruits at different stages of maturation
Creators: name: Araújo, Heverton M.
name: Rodrigues, Fabíola F. G.
name: Costa, Wégila D.
name: Nonato, Carla De F. A.
name: Rodrigues, Fábio F. G.
name: Boligon, Aline A.
name: Athayde, Margareth L.
name: Costa, José G. M.
Publisher: name: Technische Universität Dortmund
Year: 2015
Subjects: subject: Psidium guajava
subject: flavonoids
subject: phenolic compounds
subject: antioxidant activity
subject: HPLC
subject: 610

description: Psidium guajava (Myrtaceae), a common plant in Cariri region, Ceara, Brazil, as well as in various parts of the world, contains high concentrations of bioactive compounds and in many communities its parts are used for therapeutic purposes. Studies describe antioxidant, antimicrobial and anti-diarrheal actions from extracts obtained from leaves, but information about the activities of the fruits and comparison of these at different maturity stages (immature, partially mature and mature) are scarce. This study aims to evaluate the antioxidant properties by quantifying the levels of phenolic and flavonoid compounds, carotenoids and vitamin C of P. guajava fruits at different stages of maturation. The content of phenolic compounds for the immature fruit, partially mature and mature were: 22.41; 34.61 and 32.92 mg of AG/g fraction. The flavonoid content for immature fruits, intermediate and mature were: 2.83; 5.10 and 5.65 mg RUT/g fraction, respectively. Following the same standards of maturation stages, the ascorbic acid content was determined with values of 0.48; 0.38 and 0.21 mg AA/g fraction, respectively. HPLC analysis identified and quantified the presence of gallic acid, catechin, chlorogenic acid, caffeic acid, epicatechin, rutin, quercitrin, isoquercitrin, quercetin, kaempferol, glycosylated campeferol, tocopherol, β-carotene and lycopene. The antioxidant activity carried out by DPPH method showed the mature fruits bearing the best results, whereas chelation of Fe2+ ions showed higher percentage for the immature fruit. The results obtained by lipidic peroxidation were not satisfactory.
description: EXCLI Journal;Vol. 14, 2015
Quantum simulation of a three-mode optomechanical system based on the Fredkin-type interaction
Creators: name: Liu, Jin
name: Zhou, Yue-Hui
name: Huang, Jian
name: Huang, Jin-Feng
name: Liao, Jie-Qiao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The realization of multimode optomechanical interactions in the single-photon strong-coupling regime is a desired task in cavity optomechanics, but it remains a challenge in realistic physical systems. In this work, we propose a reliable scheme to simulate a three-mode optomechanical system working in the single-photon strong-coupling regime based on the Fredkin-type interaction. This is achieved by utilizing two strong drivings to the two exchangly-coupled modes in the Fredkin-type coupling involving one optical mode and two mechanical-like modes. As an application of this enhanced three-mode nonlinear optomechanical coupling, we show how to generate entangled-cat states of the mechanical-like modes using the conditional displacement mechanism. The quantum coherence effects in the generated states are investigated by calculating two-mode joint Wigner function and quantum entanglement. The influence of the dissipation effect on the state generation is considered in the open-system case.
description: 11 pages, 8 figures
BANKING ON EXTINCTION: IVORY STORAGE AND ELEPHANT CONSERVATION
Creators: name: Bulte, Erwin H.
name: Horan, Richard D.
name: Shogren, Jason F.
name: Bulte, Erwin H.
name: Horan, Richard D.
name: Shogren, Jason F.
Publisher: name: Unknown
Year: 2001
Subjects: Resource /Energy Economics and Policy

description: Ivory poachers threaten the half million remaining African elephants. In response, Kremer and Morcom (2000) offer a novel solution to reduce the risk of extinction -- a local government can stockpile ivory and threaten to dump it on the market if the elephant population falls too low lowering the expected returns from ivory sales and driving poachers out of business). We show that ivory stockpiling could be detrimental to elephant conservation because large stocks create strong incentives for strategic extinction by African governments. This result suggests an alternative strategy to enhance the viability of African elephant stocks -- international conservation organizations rather than governments should hold the stockpiles.
Dark continents : postcolonial encounters with psychoanalysis
Creators: name: McInturff, Kate
Publisher: name: University of British Columbia
Year: 2009

description: This work examines the use of psychoanalytic terms and concepts in postcolonial theory, with attention to the social and historical contexts in which those terms and models originated. The thesis provides an overview of the different academic and political contexts out of which postcolonial theory evolved, focusing on how identity came to be a central term within postcolonial debates. Drawing on the work of scholars such as Anne McClintock, it critiques the current use of psychoanalytic models by postcolonial theorists, arguing that psychoanalysis is itself implicated in the history of European imperialism and brings with it concomitant assumptions about the nature of race, class, gender, and sexuality. The thesis provides an overview of the work of Charcot, Freud and Lacan. It takes up some of their major contributions to psychoanalysis, and discusses the social and political contexts in which those works were developed. The thesis goes on to provide a detailed analysis of the intersection of postcolonial theory and psychoanalysis in the work of Frantz Fanon, Edward Said, Homi Bhabha and Helene Cixous. The thesis concludes by discussing what I view as the two major ethical and intellectual problems that arise from the use of psychoanalysis in postcolonial theory. I argue, first, that psychoanalysis developed within the same cultural and political context as European colonialism. In spite of its moments of self-consciousness, psychoanalysis, nonetheless, reproduces some of the models of identity that supported European imperialism, both in Europe and abroad. Secondly, I argue that psychoanalysis takes, at root, a pessimistic view of human nature and this pessimism is fundamentally at odds with the emancipatory motives of postcolonial theory.
title: Banking digital transformation
title: Ψηφιακός μετασχηματισμός στον τραπεζικό κλάδο
titleType: AlternativeTitle
Creators: name: Παπαδοπούλου, Μαρία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Digital transformation
subject: Banking digital transformation

description: Στην εποχή που διανύουμε παρατηρούμε μια συνεχή πρόοδο της τεχνολογίας που λαμβάνει χώρα σε όλο και περισσότερους τομείς της οικονομίας μας. Σε αυτή την εξέλιξη δεν μπορεί να μην συμμετέχει και να μεταβάλλεται το τραπεζικό και οικονομικό σύστημα. Η παροχή τραπεζικών υπηρεσιών μέσα από το διαδίκτυο αποτελεί ένα σημαντικό κομμάτι αυτής της μεταβολής (e-Banking). Ορισμένα βασικά χαρακτηριστικά της σταδιακής αλλαγής είναι η μετατροπή του φυσικού τραπεζικού καταστήματος από κέντρο συναλλαγών σε συμβουλευτικό κέντρο, η ενθάρρυνση των πελατών στην χρήση του ταχύτερου και οικονομικότερου καναλιού και η αύξησης της κερδοφορίας μειώνοντας ταυτόχρονα τα λειτουργικά έξοδα. To e-Banking αποτελεί πλέον αναπόσπαστο κομμάτι εξυπηρέτησης για όλα τα τραπεζικά ιδρύματα. Στην παρούσα διπλωματική εργασία, στόχος είναι να εξετάσει την λειτουργία του e-Banking και των νέων τεχνολογιών τόσο σε θεωρητικό όσο και σε ερευνητικό επίπεδο. Η θεωρητική ανάλυση αφορά την έννοια, τις δυνατότητες, τις προκλήσεις αλλά και τα οφέλη του νέου ψηφιακού καναλιού. Η ερευνητική προσέγγιση εξετάζει κατά κύριο λόγο στην αποτύπωση της εικόνας σχετικά με την ικανοποίηση χρήσης των πελατών (χρησιμότητα, ευκολία χρήσης, αυτό-αποτελεσματικότητα) και πως αυτή επηρεάζει την πρόθεση χρήσης του e-Banking από την μεριά του πελάτη.
A comparative study of natural immune responses against Plasmodium vivax C-terminal merozoite surface protein-1 (PvMSP-1) and apical membrane antigen-1 (PvAMA-1) in two endemic settings
Creators: name: Xia, Hui
name: Fang, Qiang
name: Jangpatarapongsa, Kulachart
name: Zhiyong, Tao
name: Cui, Liwang
name: Li, Baiqing
name: Udomsangpetch, Rachanee
Publisher: name: Technische Universität Dortmund
Year: 2015
Subjects: subject: malaria immunity
subject: Plasmodium vivax
subject: Plasmodium falciparum
subject: antibody to malaria
subject: 610

description: The mechanisms of cellular and humoral immune responses against P. vivax parasite remain poorly understood. Several malaria immunological studies have been conducted in endemic regions where both P. falciparum and P. vivax parasites co-exist. In this study, a comparative analysis of immunity to Plasmodium vivax antigens in different geography and incidence of Plasmodium spp. infection was performed. We characterised antibodies against two P. vivax antigens, PvMSP-1 and PvAMA-1, and the cross-reactivity between these antigens using plasma from acute malaria infected patients living in the central region of China and in the western border of Thailand. P. vivax endemicity is found in central China whereas both P. vivax and P. falciparum are endemic in Thailand. There was an increased level of anti-PvMSP-1/anti-PvAMA-1 in both populations. An elevated level of antibodies to total P. vivax proteins and low level of antibodies to total P. falciparum proteins was found in acute P. vivax infected Chinese, suggesting antibody cross-reactivity between the two species. P. vivax infected Thai patients had both anti-P. vivax and anti-P. falciparum antibodies as expected since both species are present in Thailand. More information on humoral and cell mediated immunity during acute P. vivax-infection in the area where only single P. vivax species existed is of great interest in the relation of building up anti-disease severity caused by P. falciparum. This knowledge will support vaccine development in the future.
description: EXCLI Journal;Vol. 14, 2015
title: Άμεση ξένη επένδυση: η περίπτωση της Jumbo στην Κύπρο και στην Βουλγαρία
title: Foreign direct investment: the case of Jumbo in Cyprus and Bulgaria
titleType: AlternativeTitle
Creators: name: Αθανασόπουλος, Κωνσταντίνος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Άμεσες ξένες επενδύσεις
subject: Κύπρος
subject: Βουλγαρία
subject: Jumbo

description: Η παγκοσμιοποίηση είναι μια συνεχής διαδικασία ενδυνάμωσης του βαθμού αλληλεξάρτησης και αλληλεπίδρασης των αγορών όλου του κόσμου. Συνιστά μια περισσότερη σύνθετη μορφή διεθνοποίησης που περιλαμβάνει και κάποιο βαθμό λειτουργικής ενσωμάτωσης διεθνώς διασκορπισμένων οικονομικών δραστηριοτήτων. Ο βαθμός διεθνοποίησης των δραστηριοτήτων μιας επιχείρησης εξαρτάται από την αναλογία των εγχώριων και των διεθνών δραστηριοτήτων της, ενώ, ως προς τις τελευταίες, σημαντικότατος είναι οι ρόλος των Άμεσων Ξένων Επενδύσεων. Από την άλλη πλευρά, οι Άμεσες Ξένες Επενδύσεις (ΑΞΕ) αντιμετωπίζονται ως ένα σπουδαίο εργαλείο στην πορεία της παγκοσμιοποίησης και έχουν έναν σημαντικό ρόλο στην οικονομική ανάπτυξη πολλών χωρών, μέσω της ποιοτικής αναβάθμισης της υποδομής τους, της βελτίωσης των τεχνικών δεξιοτήτων, των ικανοτήτων των επιχειρηματιών και των οικονομικών πόρων, σε σχέση με τα έσοδα της χώρας της επένδυσης και το ξένο συνάλλαγμα. Στην παρούσα εργασία, αφού παρουσιαστεί και αναλυθεί εισαγωγικά με περιεκτικό και σχετικά ευσύνοπτο τρόπο το θεωρητικό περίγραμμα των Άμεσων Ξένων Επενδύσεων, θα σκιαγραφήσουμε στην επόμενη ενότητα τα βασικά στοιχεία που αφορούν την ιστορική διαδρομή, τη δομή, το οργανόγραμμα και τα βασικά οικονομικά στοιχεία της εταιρείας JUMBO. Κατόπιν, και μετά από μια γενική παρουσίαση του πολιτικού πλαισίου και του οικονομικού, επιχειρηματικού και επενδυτικού περιβάλλοντος της Κύπρου, θα επιχειρήσουμε να παρουσιάσουμε τα οικονομικά δεδομένα της παρουσίας της JUMBO στην Κύπρο καταλήγοντας και σε μια λεπτομερή SWOT ανάλυση για μια ολιστική κριτική προσέγγιση του επενδυτικού εγχειρήματος. Κινούμενοι αναλογικά, αφού παρατεθούν στοιχεία που αφορούν το πολιτικό πλαίσιο, το οικονομικό περιβάλλον και την παρουσία ελληνικών επιχειρήσεων στη Βουλγαρία, θα υπεισέλθουμε αναλυτικά στην παρουσίαση των οικονομικών στοιχείων της επενδυτικής παρουσίας της JUMBO στη Βουλγαρία κατευθυνόμενοι και πάλι τελικά σε μια πλήρη SWOT ανάλυση. Κλείνοντας, θα παρουσιάσουμε σε συνεκτική βάση τα συμπεράσματά μας για τις επενδύσεις της JUMBO σε αυτές τις δύο χώρες, επιχειρώντας να αποκτήσουμε μια πανοραμική επισκόπηση της επενδυτικής φιλοσοφίας της εταιρείας εν γένει.
MOCCA: Multi-Layer One-Class ClassificAtion for Anomaly Detection
Creators: name: Massoli, Fabio Valerio
name: Falchi, Fabrizio
name: Kantarci, Alperen
name: Akti, Şeymanur
name: Ekenel, Hazim Kemal
name: Amato, Giuseppe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.5
subject: 68-XX

description: Anomalies are ubiquitous in all scientific fields and can express an unexpected event due to incomplete knowledge about the data distribution or an unknown process that suddenly comes into play and distorts observations. Due to such events' rarity, to train deep learning models on the Anomaly Detection (AD) task, scientists only rely on "normal" data, i.e., non-anomalous samples. Thus, letting the neural network infer the distribution beneath the input data. In such a context, we propose a novel framework, named Multi-layer One-Class ClassificAtion (MOCCA),to train and test deep learning models on the AD task. Specifically, we applied it to autoencoders. A key novelty in our work stems from the explicit optimization of intermediate representations for the AD task. Indeed, differently from commonly used approaches that consider a neural network as a single computational block, i.e., using the output of the last layer only, MOCCA explicitly leverages the multi-layer structure of deep architectures. Each layer's feature space is optimized for AD during training, while in the test phase, the deep representations extracted from the trained layers are combined to detect anomalies. With MOCCA, we split the training process into two steps. First, the autoencoder is trained on the reconstruction task only. Then, we only retain the encoder tasked with minimizing the L_2 distance between the output representation and a reference point, the anomaly-free training data centroid, at each considered layer. Subsequently, we combine the deep features extracted at the various trained layers of the encoder model to detect anomalies at inference time. To assess the performance of the models trained with MOCCA, we conduct extensive experiments on publicly available datasets. We show that our proposed method reaches comparable or superior performance to state-of-the-art approaches available in the literature.
description: The paper has been accepted for publication in the IEEE Transactions on Neural Networks and Learning Systems, Special Issue on Deep Learning for Anomaly Detection
Big Bang nucleosynthesis in scalar tensor gravity: the key problem of the $^7$Li abundance
Creators: name: Larena, Julien
name: Alimi, Jean-Michel
name: Serna, Arturo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Combined with other CMB experiments, the WMAP survey provides an accurate estimate of the baryon density of the Universe. In the framework of the standard Big Bang Nucleosynthesis (BBN), such a baryon density leads to predictions for the primordial abundances of $^{4}$He and D in good agreement with observations. However, it also leads to a significant discrepancy between the predicted and observed primordial abundance of $^{7}$Li. Such a discrepancy is often termed as 'the lithium problem'. In this paper, we analyze this problem in the framework of scalar-tensor theories of gravity. It is shown that an expansion of the Universe slightly slower than in General Relativity before BBN, but faster during BBN, solves the lithium problem and leads to $^4$He and D primordial abundances consistent with the observational constraints. This kind of behavior is obtained in numerous scalar-tensor models, both with and without a self-interaction potential for the scalar field. In models with a self-interacting scalar field, the convergence towards General Relativity is ensured without any condition, thanks to an attraction mechanism which starts to work during the radiation-dominated epoch.
description: Revised version. CMB and matter power spectrum constraints added. Accepted for publication in ApJ
Separation of glycine-rich proteins from sea hare eggs and their anti-cancer activity against U937 leukemia cell line
Creators: name: Lee, WonWoo
name: Kim, Won-Suck
name: Ahn, Ginnae
name: Kim, Kil-Nam
name: Heo, Soo-Jin
name: Cho, Moonjae
name: Fernando, I. P. Shanura
name: Kang, Nalae
name: Jeon, You-Jin
Publisher: name: Technische Universität Dortmund
Year: 2016
Subjects: subject: sea hare egg (SE)
subject: glycine-rich protein
subject: anti-cancer effect
subject: apoptosis
subject: mitochondrial pathway
subject: 610

description: The present study was designed to investigate the anti-cancer effects of Sea hare eggs (SE) in U937 cells and its major active components. The aqueous extract of SE (ASE), which contained the highest protein content, dosedependently inhibited the cancer cell’s growth (IC50 value, 10.42 ± 0.5 μg/mL). Additionally, ASE markedly caused DNA damage by inducing apoptotic body formation, DNA fragmentation, and accumulation of sub-G1 DNA contents. ASE induced apoptosis by activating caspase-3 and 9 and poly (ADP-ribose) polymerase (PARP) by regulating the expression of Bcl-2/Bax. Moreover, among its molecular weight fractions, the > 30 kDa fraction showed the highest cell-growth-inhibitory effects, which was inhibited by heat treatment. Furthermore, the > 30 kDa fraction had markedly higher glycine content than the ASE. The presence of two protein bands at around 16 and 32 kDa was identified. In addition, two fractions, F1 and F2, were obtained using anion-exchange chromatography, with the F1 having an improved cell-growth-inhibitory effect than the > 30 kDa fraction. Taken together, these results suggest that the ASE contains glycine-rich proteins, including the active 16 and 32 kDa proteins, which account for its anti-cancer effects by inducing apoptosis via regulation of the mitochondrial pathway.
description: EXCLI Journal;Vol. 15, 2016
Microscopic origin of the second law of thermodynamics
Creators: name: Feng, You-gang
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We proved when random-variable fluctuations obey the central limit theorem the equality of the uncertainty relation corresponds to the thermodynamic equilibrium state. The inequality corresponds to the thermodynamic non-equilibrium state. The uncertainty relation is a quantum-mechanics expression of the second law of thermodynamics originated in wave-particle duality. Formulas of mean square-deviations changes adjusted by random fluctuations under the minimal uncertainty relation are obtained. Finally, an assumption is made which is waiting for examination. We except phase transitions in our discussion.
description: 8 pages
A search for Interstellar absorptions towards Sgr dSph
Creators: name: Monai, S.
name: Bonifacio, P.
name: Sbordone, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We searched for Na I D1,D2 interstellar absorption lines towards 12 giant stars of the Sgr dwarf spheroidal and 3 stars of the associated globular cluster Terzan 7, observed at high resolution with the UVES spectrograph at the 8.2 m Kueyen VLT telescope. These stars are not an ideal background source for the analysis of interstellar (IS) absorption lines since they have been observed in the framework of a stellar abundances study. However they are sufficiently luminous to allow a decent S/N ratio at a resolution of about 43000, i.e. ~7 km/s, which allows an exploratory study. We detected two distinct groups of IS absorptions, a ``local'' group, with radial velocities ranging from -43 km/s to 50 km/s, and a high velocity group with radial velocities ranging from 150 km/s to 165 km/s. Likely the high velocity components are due to gas falling on the Sgr dSph since have been observed only in 2 stars which are separated by only 1.5' in the sky. We argue that the observations suggest a stripping of gas due to the passage of Sgr through the Galactic disc.
description: accepted by Astronomy & Astrophysics
Noise-driven Topological Changes in Chaotic Dynamics
Creators: name: Charó, Gisela D.
name: Chekroun, Mickaël D.
name: Sciamarella, Denisse
name: Ghil, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Noise modifies the behavior of chaotic systems in both quantitative and qualitative ways. To study these modifications, the present work compares the topological structure of the deterministic Lorenz (1963) attractor with its stochastically perturbed version. The deterministic attractor is well known to be "strange" but it is frozen in time. When driven by multiplicative noise, the Lorenz model's random attractor (LORA) evolves in time. Algebraic topology sheds light on the most striking effects involved in such an evolution. In order to examine the topological structure of the snapshots that approximate LORA, we use Branched Manifold Analysis through Homologies (BraMAH) -- a technique originally introduced to characterize the topological structure of deterministically chaotic flows -- which is being extended herein to nonlinear noise-driven systems. The analysis is performed for a fixed realization of the driving noise at different time instants in time. The results suggest that LORA's evolution includes sharp transitions that appear as topological tipping points.
description: 12 pages and 4 figures
Production of cold molecules via magnetically tunable Feshbach resonances
Creators: name: Koehler, Thorsten
name: Goral, Krzysztof
name: Julienne, Paul S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Magnetically tunable Feshbach resonances were employed to associate cold diatomic molecules in a series of experiments involving both atomic Bose as well as two spin component Fermi gases. This review illustrates theoretical concepts of both the particular nature of the highly excited Feshbach molecules produced and the techniques for their association from unbound atom pairs. Coupled channels theory provides the rigorous formulation of the microscopic physics of Feshbach resonances in cold gases. Concepts of dressed versus bare energy states, universal properties of Feshbach molecules, as well as the classification in terms of entrance- and closed-channel dominated resonances are introduced on the basis of practical two-channel approaches. Their significance is illustrated for several experimental observations, such as binding energies and lifetimes with respect to collisional relaxation. Molecular association and dissociation are discussed in the context of techniques involving linear magnetic field sweeps in cold Bose and Fermi gases as well as pulse sequences leading to Ramsey-type interference fringes. Their descriptions in terms of Landau-Zener, two-level mean field as well as beyond mean field approaches are reviewed in detail, including the associated ranges of validity.
description: 50 pages, 26 figures, to be published in Reviews of Modern Physics, final version with updated references
Transfer learning In recommender systems
Creators: name: Zografou, Christina
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2019
Subjects: subject: Transfer learning
subject: Recommendation systems

description: Τα συστήματα συστάσεων γίνονται ολοένα και πιο σημαντικά στις μέρες μας προσφέροντας μεγάλο πλεονέκτημα στις επιχειρήσεις. Όμως, η ύπαρξη λίγων και αραιών δεδομένων είναι ένα σημαντικό πρόβλημα για τα συστήματα συστάσεων που κάνουν χρήση τεχνικών collaborative filtering (CF), ειδικά σε περιπτώσεις νέων χρηστών ή νέων αντικειμένων, δυσκολεύοντας τη δημιουργία προτάσεων. Εδώ έγκειται η Μεταφορά Γνώσης (Transfer Learning). Σε αυτή τη μελέτη, ο στόχος είναι να βελτιωθεί η ποιότητα των προτάσεων σε ένα σύνολο δεδομένων χρησιμοποιώντας γνώση από ένα άλλο σύνολο δεδομένων. Πιο συγκεκριμένα, ο στόχος είναι να βελτιωθούν οι συστάσεις στον τομέα CDs & Vinyl χρησιμοποιώντας βαθμολογίες από τον τομέα Digital Music. Τα πειραματικά αποτελέσματα δείχνουν ότι οι προτάσεις στον τομέα CDs & Vinyl μπορούν όντως να επωφεληθούν από τη χρήση γνώσης από τον τομέα Digital Music.
In vitro evaluation of the comprehensive antimicrobial and antioxidant properties of Curtisia dentata (Burm.f) C.A. Sm: toxicological effect on the human embryonic kidney (HEK293) and human hepatocellular carcinoma (HepG2) cell lines
Creators: name: Fadipe, VO
name: Mongalo, NI
name: Opoku, AR
Publisher: name: Technische Universität Dortmund
Year: 2015
Subjects: subject: Curtisia dentata
subject: β-sitosterol
subject: ethnomedicine
subject: cytotoxicity
subject: antioxidant
subject: antimicrobial
subject: 610

description: Curtisia dentata is used in African traditional medicine to treat variety of infections. C. dentata leaves were collected from Buffelskloof Nature Reserve, South Africa. The ethanol, chloroform, ethyl acetate and acetone extracts were evaluated for antimicrobial activity using micro dilution assay against Escherichia coli, Pseudomonas aeruginosa, Mycobacterium smegmatis, Mycoplasma hominis, Candida albicans and some clinical isolates of Moraxella catarrhalis, Proteus mirabilis and Staphylococcus aureus isolated from HIV patient. Acetone extract exhibited lowest MIC of 0.01 mg/ml against Candida albicans compared to other extracts. Besides lupeol, betulinic acid and ursolic acid, β-sitosterol was isolated for the first time from C. dentata leaves and exhibited antimicrobial activity with MIC values ranging from 0.20 to 6.25 mg/ml. Furthermore, the ethanol extract and the four isolated compounds revealed microbicidal effect, with MIC index of less than 4. Ethanol extract revealed the best total activity of 2400 ml/g against Mycoplasma hominis. Cytotoxicity of the isolated compounds was further investigated against the Human embryonic kidney (HEK293) and Human hepatocellular carcinoma (HepG2) cell lines using the MTT assay. Ursolic acid exhibited the lowest LD50 of 122.4 μg/ml against HEK293 cell line while lupeol exhibited LD50 of 278.8 and 289.4 μg/ml against HEK293 and HepG2 respectively. Lupeol exhibited low selectivity index. Ethyl acetate and acetone extracts were further investigated for antioxidant activity against 2,2-diphenyl-1-picrylhydrazyl (DPPH). The acetone extract exhibited potent inhibition of DPPH compared to ethyl acetate extract. The findings of the current work validate the use of the plant species in the treatment of various human infections.
description: EXCLI Journal;Vol. 14, 2015
Multi-block simulations in general relativity: high order discretizations, numerical stability, and applications
Creators: name: Lehner, Luis
name: Reula, Oscar
name: Tiglio, Manuel
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The need to smoothly cover a computational domain of interest generically requires the adoption of several grids. To solve the problem of interest under this grid-structure one must ensure the suitable transfer of information among the different grids involved. In this work we discuss a technique that allows one to construct finite difference schemes of arbitrary high order which are guaranteed to satisfy linear numerical and strict stability. The technique relies on the use of difference operators satisfying summation by parts and {\it penalty techniques} to transfer information between the grids. This allows the derivation of semidiscrete energy estimates for problems admitting such estimates at the continuum. We analyze several aspects of this technique when used in conjuction with high order schemes and illustrate its use in one, two and three dimensional numerical relativity model problems with non-trivial topologies, including truly spherical black hole excision.
description: 35 pages
Anti-inflammatory effects of enzymatic hydrolysates of velvet antler in RAW 264.7 cells in vitro and zebrafish model
Creators: name: Lee, Seung-Hong
name: Yang, Hye-Won
name: Ding, Yuling
name: Wang, Yanmei
name: Jeon, You-Jin
name: Moon, Sang-Ho
name: Jeon, Byong-Tae
name: Sung, Si-Heung
Publisher: name: Technische Universität Dortmund
Year: 2015
Subjects: subject: enzymatic hydrolysis
subject: velvet antler
subject: bioactive components
subject: anti-inflammatory effect
subject: 610

description: Enzymatic hydrolysis has been successfully used for the extraction of numerous biologically active components from a wide variety of natural sources. In the present study, velvet antler was subjected to the extraction process using Alcalase protease. We analyzed bioactive components, such as uronic acid, sulfated-glycosaminoglycans (sulfated-GAGs), and sialic acid, present in the velvet antler Alcalase hydrolysate (VAAH) and assessed their anti-inflammatory effects in zebrafish as well as in vitro using cell lines. VAAH mainly contained uronic acid (78.22 mg/g) and sulfated-GAGs (50.47 mg/g), while the amount of sialic acid was negligible (5.55 mg/g). VAAH inhibited the production of nitric oxide (NO) by lipopolysaccharide (LPS)-induced cells in a dosedependent manner and the inhibitory effect of VAAH on NO production was higher than that of hot water extracts. VAAH treatment also reduced the expression of inflammatory mediators such as nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2). Furthermore, we evaluated anti-inflammatory effects of VAAH using LPS-stimulated zebrafish. Treatment with LPS significantly increased cell death, NO, and reactive oxygen species (ROS) levels in zebrafish. Notably, VAAH significantly inhibited the extent of LPS-stimulated cell death and generation of NO and ROS in zebrafish. These results suggest that VAAH alleviated inflammation and cell death by inhibiting the generation of ROS induced by LPS treatment. Thus, VAAH could be used as a potential natural remedy with a trong anti-inflammatory effect. Taken together, we believe that based on our present results, enzymatic hydrolysis of velvet antler may be an effective process to make antler products acceptable as elements of health foods and nutraceutical components with increased biological activity.
description: EXCLI Journal;Vol. 14, 2015
Πειραματική μελέτη συσταδοποίησης δεδομένων με τον αλγόριθμο K-Means στο Spark
Creators: name: Πεφάνης, Νικόλαος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Machine learning
subject: K-Means

description: Στα πλαίσια της παρούσας διπλωματικής γίνεται εισαγωγή στις έννοιες Επιστήμη Δεδομένων και τη Μηχανική Μάθηση. Σκοπός της μελέτης που έγινε είναι μέσα από διαφορετικά σύνολα δεδομένων να παρατηρήσουμε τη συμπεριφορά του δημοφιλούς αλγορίθμου K-Means χρησιμοποιώντας ταυτόχρονα διάφορες τεχνολογίες όπως η γλώσσα προγραμματισμού Python και το Apache Spark.
A Couple of Transcendental Prime-Representing Constants
Creators: name: Varona, Juan L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: Primary 11A41, Secondary 11J81

description: It is well known that the arithmetic nature of Mills' prime-representing constant is uncertain: we do not know if Mills' constant is a rational or irrational number. In the case of other prime-representing constants, irrationality can be proved, but it is not known whether these constants are algebraic or transcendental numbers. By using Liouville or Roth's theorems about approximation by rationals, we find a couple of prime-representing constants that can be proved to be transcendental numbers.
description: 8 pages, Amer. Math. Monthly