cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Computational Challenges in Global Environmental Research Infrastructures
Creators: name: Martin, Paul
name: Chen, Yin
name: Hardisty, Alex
name: Jeffery, Keith
name: Zhao, Zhiming
Publisher: name: Zenodo
Year: 2017
Subjects: Research infrastructure
Environmental and earth sciences
data management
ENVRI

description: Environmental science research is increasingly dependent on the collection and analysis of large volumes of data gathered via wide-scale deployments of sensors and other observation sources. Meanwhile researchers are being called upon to address global societal challenges that are inextricably tied to the stability of our native ecosystems. These challenges are intrinsically interdisciplinary in nature, forcing scientists to collaborate across traditional disciplinary boundaries. The role of research infrastructure in this context is to support researchers in their interactions with a host of different data sources and analytical tools, as well as with each other, but no single environmental research infrastructure can hope to fully encompass the entire research ecosystem that has arisen to support the study of environmental science. The challenge therefore is for new environmental research infrastructures to exhibit sufficient technical interoperability between the different services they offer so as to permit researchers to freely and effectively interact with the full range of research assets potentially available to them, allowing them to collaborate and conduct innovative interdisciplinary research regardless of the particular research community to which they belong. Realising this ideal however requires a broad understanding of the fundamental commonalities of environmental science research infrastructure services as well as the development and wide adoption of common foundational services. It also requires a pragmatic bridging between the different standards and controlled vocabularies currently in use or preparation by different scientific communities, a process that can be expedited by the use of a standard reference model and the use of a formal framework for semantically linking similar concepts in different contexts.
The trickster shift : a new paradigm in contemporary Canadian Native art
Creators: name: Ryan, Allan J.
Publisher: name: University of British Columbia
Year: 2009

description: Over the last fifteen years a select group of professionally trained and politically astute Canadian artists of Native ancestry has produced a compelling body of work that owes much of its power to a wry and ironic sense of humour rooted firmly in oral tradition. More than a critical/political strategy, such humour reflects a widespread cultural and communal sensibility embodied in the mythical Native American Trickster. The present study explores the influence of this comic spirit on the practice of several artists through the presentation of a "Trickster discourse," that is, a body of overlapping and interrelated verbal and visual narratives by tricksters and about trickster practice. Most of the research for this project took place between January 1990 and November 1991 and involved extended conversations with artists, elders, actors, writers, linguists, curators and art historians in six Canadian provinces. Over 80 hours of interviews were amassed along with several hundred slides and photographs of artists' work. From this body of material 140 images were selected for analysis with well over 100 commentaries and reflections on practice excerpted from the interviews. These verbal and visual narratives have been gathered together under the broad headings of self-identity, representation, political control and global presence. In light of the highly eclectic and hybrid nature of these narratives, an eclectic and hybrid conceptual framework has been constructed to consider them. Accordingly, a multiplicity of theoretical concepts has been braided together and interwoven throughout the chapters to reflect the complexity, density and interconnectedness of the material. To convey the sense of raultilayered communication and simultaneous conversation, quotation and footnote have been used extensively as parallel and overlapping texts. In this they constitute a form of hypertext or hypermedia. More importantly, the text honours and participates in a non-linear process of representation shared by many of the artists.
Critical polynomials in the nonplanar and continuum percolation models
Creators: name: Xu, Wenhui
name: Wang, Junfeng
name: Hu, Hao
name: Deng, Youjin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Exact or precise thresholds have been intensively studied since the introduction of the percolation model. Recently the critical polynomial $P_{\rm B}(p,L)$ was introduced for planar-lattice percolation models, where $p$ is the occupation probability and $L$ is the linear system size. The solution of $P_{\rm B} = 0$ can reproduce all known exact thresholds and leads to unprecedented estimates for thresholds of unsolved planar-lattice models. In two dimensions, assuming the universality of $P_{\rm B}$, we use it to study a nonplanar lattice model, i.e., the equivalent-neighbor lattice bond percolation, and the continuum percolation of identical penetrable disks, by Monte Carlo simulations and finite-size scaling analysis. It is found that, in comparison with other quantities, $P_{\rm B}$ suffers much less from finite-size corrections. As a result, we obtain a series of high-precision thresholds $p_c(z)$ as a function of coordination number $z$ for equivalent-neighbor percolation with $z$ up to O$(10^5)$, and clearly confirm the asymptotic behavior $zp_c-1 \sim 1/\sqrt{z}$ for $z \rightarrow \infty$. For the continuum percolation model, we surprisingly observe that the finite-size correction in $P_{\rm B}$ is unobservable within uncertainty O$(10^{-5})$ as long as $L \geq 3$. The estimated threshold number density of disks is $ρ_c = 1.436 325 05(10)$, slightly below the most recent result $ρ_c = 1.436 325 45(8)$ of Mertens and Moore obtained by other means. Our work suggests that the critical polynomial method can be a powerful tool for studying nonplanar and continuum systems in statistical mechanics.
description: 12 pages, 12 figures
Boundary hopping and the mobility edge in the Anderson model in three dimensions
Creators: name: Cerovski, Viktor Z.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It is shown, using high-precision numerical simulations, that the mobility edge of the 3d Anderson model depends on the boundary hopping term t in the infinite size limit. The critical exponent is independent of it. The renormalized localization length at the critical point is also found to depend on t but not on the distribution of on-site energies for box and Lorentzian distributions. Implications of results for the description of the transition in terms of a local order-parameter are discussed.
Prophet inequalities for i.i.d. random variables with random arrival times
Creators: name: Allaart, Pieter C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G40

description: Suppose $X_1,X_2,...$ are i.i.d. nonnegative random variables with finite expectation, and for each $k$, $X_k$ is observed at the $k$-th arrival time $S_k$ of a Poisson process with unit rate which is independent of the sequence $\{X_k\}$. For $t>0$, comparisons are made between the expected maximum $M(t):=\rE[\max_{k\geq 1} X_k \sI(S_k\leq t)]$ and the optimal stopping value $V(t):=\sup_{τ\in\TT}\sE[X_τ\sI(S_τ\leq t)]$, where $\TT$ is the set of all $\NN$-valued random variables $τ$ such that $\{τ=i\}$ is measurable with respect to the $σ$-algebra generated by $(X_1,S_1),...,(X_i,S_i)$. For instance, it is shown that $M(t)/V(t)\leq 1+α_0$, where $α_0\doteq 0.34149$ satisfies $\int_0^1(y-y\ln y+α_0)^{-1} dy=1$; and this bound is asymptotically sharp as $t\to\infty$. Another result is that $M(t)/V(t)<2-(1-e^{-t})/t$, and this bound is asymptotically sharp as $t\downarrow 0$. Upper bounds for the difference $M(t)-V(t)$ are also given, under the additional assumption that the $X_k$ are bounded.
description: 16 pages with 1 figure; submitted to Sequential Analysis in shortened form
Characterizing mixed state entanglement through single-photon interference
Creators: name: Lahiri, Mayukh
name: Lapkiewicz, Radek
name: Hochrainer, Armin
name: Lemos, Gabriela Barreto
name: Zeilinger, Anton
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Entanglement verification and measurement is essential for experimental tests of quantum mechanics and also for quantum communication and information science. Standard methods of verifying entanglement in a bipartite mixed state require detection of both particles and involve coincidence measurement. We present a method that enables us to verify and measure entanglement in a two-photon mixed state without detecting one of the photons, i.e., without performing any coincidence measurement or postselection. We consider two identical sources, each of which can generate the same two-photon mixed state but they never emit simultaneously. We show that one can produce a set of single-photon interference patterns, which contain information about entanglement in the two-photon mixed state. We prove that it is possible to retrieve the information about entanglement from the visibility of the interference patterns. Our method reveals a distinct avenue for verifying and measuring entanglement in mixed states.
description: 10 pages, 3 figures
Essential selfadjointness of the graph-Laplacian
Creators: name: Jorgensen, Palle E. T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81Q15

description: We study the operator theory associated with such infinite graphs $G$ as occur in electrical networks, in fractals, in statistical mechanics, and even in internet search engines. Our emphasis is on the determination of spectral data for a natural Laplace operator associated with the graph in question. This operator $Δ$ will depend not only on $G$, but also on a prescribed positive real valued function $c$ defined on the edges in $G$. In electrical network models, this function $c$ will determine a conductance number for each edge. We show that the corresponding Laplace operator $Δ$ is automatically essential selfadjoint. By this we mean that $Δ$ is defined on the dense subspace $\mathcal{D}$ (of all the real valued functions on the set of vertices $G^{0}$ with finite support) in the Hilbert space $l^{2}% (G^{0})$. The conclusion is that the closure of the operator $Δ$ is selfadjoint in $l^{2}(G^{0})$, and so in particular that it has a unique spectral resolution, determined by a projection valued measure on the Borel subsets of the infinite half-line. We prove that generically our graph Laplace operator $Δ=Δ_{c}$ will have continuous spectrum. For a given infinite graph $G$ with conductance function $c$, we set up a system of finite graphs with periodic boundary conditions such the finite spectra, for an ascending family of finite graphs, will have the Laplace operator for $G$ as its limit.
description: 50 pages with TOC and figures
O'ZBEKISTON RESPUBLIKASI SUD-HUQUQ TIZIMIGA RAQAMLI TEXNOLOGIYALARNI JORIY ETILISHI VA ULARNING IJOBIY TOMONLARI
Creators: name: Tursunov, Davronbek
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolaning maqsadi O‘zbekiston Respublikasi sud tizimiga raqamli texnologiyalarni joriy etish va raqamli qo‘llab-quvvatlash orqali odil sudlovni amalga oshirishni ochib berishdan iborat. Sud-huquq tizimida raqamli texnologiyalarni rivojlantirish sharoitlari va ta’siri tahlil qilinar ekan, raqamli texnologiyalarni joriy etish masalalariga alohida to‘xtalib o‘tildi.
Limits on Intrinsic Charm Production from the SeaQuest Experiment
Creators: name: Vogt, R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Background: A nonperturbative charm production contribution, known as intrinsic charm, has long been speculated but has never been satisfactorily proven. The SeaQuest experiment at FNAL is in an ideal kinematic region to provide evidence of $J/ψ$ production by intrinsic charm. Purpose: $J/ψ$ production in the SeaQuest kinematics is calculated with a combination of perturbative QCD and intrinsic charm to see whether the SeaQuest data can put limits on an intrinsic charm contribution. Methods: $J/ψ$ production in perturbative QCD is calculated to next-to-leading order in the cross section. Cold nuclear matter effects include nuclear modification of the parton densities, absorption by nucleons, and $p_T$ broadening by multiple scattering. The $J/ψ$ contribution from intrinsic charm is calculated assuming production from a $|uud c \overline c \rangle$ Fock state. Results: The nuclear modification factor, $R_{pA}$, is calculated as a function of $x_F$ and $p_T$ for $p+$C, $p+$Fe, and $p+$W interactions relative to $p+$d. Conclusions: The SeaQuest kinematic acceptance is ideal for testing the limits on intrinsic charm in the proton.
description: 21 pages, 12 figures
Διερεύνηση του πεδίου εφαρμογών της δοκιμής αποχρωματισμού της κροκίνης με σκοπό τη μελέτη σχέσης δομής-αντιοξειδωτικής δράσης:
Creators: name: Μπουντουγκίδου, Ολγα Γκανιμπάλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Δοκιμή αποχρωματισμού της κροκίνης
Αρωματικές αλδεΰδες
Ελεύθερες ρίζες
Φυσικά αντιοξειδωτικά
On line μέθοδοι
In vitro
Crocin bleaching assay
CBA
Aromatic aldehydes
On line method
Free radicals
Natural antioxidants

description: Μελετήθηκε η δυνατότητα διεύρυνσης του πεδίου εφαρμογών της δοκιμής αποχρωματισμού της κροκίνης (CBA) στην εξέταση δομικά συγγενών φαινολικών ενώσεων ή/και πολύπλοκων μιγμάτων. Συγκεκριμένα, εξετάσθηκε η ικανότητα δέσμευσης ελευθέρων ριζών από μια σειρά υδροξυβενζαλδεϋδών και των αντίστοιχων οξέων τόσο με τη βοήθεια της CBA όσο και άλλων δοκιμών (DPPH•, ABTS•+, Rancimat) προκειμένου να αξιολογηθεί η δυνατότητα εκτίμησης σχέσεων δομής-αντιοξειδωτικής δράσης (SARs). Βρέθηκε ότι η άμεση υποκατάσταση του φαινολικού δακτυλίου με αλδεΰδο- αντί της καρβοξυλικής ομάδας επιφέρει μεταβολές στην δραστικότητα της ένωσης. Παράλληλα, πραγματοποιήθηκε μια πρώτη προσπάθεια on-line σύζευξης της CBA με μια διαχωριστική τεχνική (HPLC) ώστε να είναι δυνατή η εξέταση πολύπλοκων μιγμάτων φυσικών προϊόντων ή/και βιολογικών υγρών. Τα πειραματικά αποτελέσματα ήταν ενθαρρυντικά ως προς την κατεύθυνση αυτή.
description: Broadening the field of the Crocin Bleaching Assay (CBA) applications with respect to structure-activity relationships (SARs) among structurally related phenolic compounds and/or complex mixtures was studied. Concretely, structure-radical scavenging activity relationships among five hydroxybenzaldehydes and related acids were evaluated using CBA and other assays (DPPH•, ABTS•+, Rancimat). The direct replacement of an ionizable –COOH group of phenolic ring with –CHO group affected the antioxidant activity of the test compounds by all methods. Furthermore, some first experiments were carried out for the on-line HPLC-CBA assessment of radical scavenging activity of complex mixtures of natural products and/or biological fluids. The results are promising but further optimizing experiments should be held.
Οι Μητροπολίτες Καστοριάς (1836- 1958) με βάση τα υπομνήματα εκλογής τους.:
Creators: name: Γεωργιάδου, Αικατερίνη Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Καστοριά
Μητροπολίτες Καστοριάς
Μητρόπολη Καστοριάς
Kastoria
Metropolitan of Kastoria
Bishops of Kastoria

description: Το αντικείμενο της μεταπτυχιακής μου εργασίας αφορά στους μητροπολίτες Καστοριάς (1836-1958) με βάση τα υπομνήματα εκλογής τους. Στο 1ο κεφάλαιο μελετούμε τη γεωγραφική θέση, την ονομασία και την ιστορική πορεία της πόλεως. Στο 2ο κεφάλαιο εξετάζουμε την εκκλησιαστική ιστορία της μητροπόλεως της Καστοριάς. Τα πρώτα χρόνια η επισκοπή της Καστοριάς υπαγόταν στη μητρόπολη Θεσσαλονίκης. Από τις αρχές του 11ου αιώνα μέχρι το 1767 υπάγεται στην Αυτοκέφαλη Αρχιεπισκοπή Αχρίδας. Τέλος από το 1928 υπάγεται πνευματικά στο οικουμενικό πατριαρχείο και διοικητικά βρίσκεται υπό τη δικαιοδοσία της Αυτοκέφαλης Εκκλησίας της Ελλάδας . Στο 3ο κεφάλαιο παρουσιάζουμε τα βιογραφικά στοιχεία των μητροπολιτών, δίνοντας έμφαση στην εκλογή τους και στην ποιμαντική τους δραστηριότητα. Την περίοδο αυτή οι μητροπολίτες Καστοριάς διακρίθηκαν για τη σημαντική τους συμβολή στα εθνικά και στα εκπαιδευτικά ζητήματα. Τα υπομνήματα εκλογής τους και τα άρθρα των τοπικών εφημερίδων υπήρξαν οι βασικές μας πηγές, οι οποίες μας δίνουν πληροφορίες για τον ακριβή χρόνο εκλογής τους και για τους συνυποψήφιους τους. Κατά την διάρκεια αυτών των χρόνων υπηρέτησαν τη μητρόπολη Καστοριάς 12 μητροπολίτες, αξίζει να σημειώσουμε ότι από το 1931 έως το 1936 ο μητροπολιτικός θρόνος της Καστοριάς έμεινε κενός. Εν κατακλείδι χάρη στη μελέτη των υπομνημάτων εκλογής των μητροπολιτών της Καστοριάς, πετύχαμε την αποκατάσταση του επισκοπικού καταλόγου.
description: The object of this postgraduate thesis concerns the Bishops of Kastoria during the period 1836 - 1958, based on the memoranda of their election. In the first chapter, we study the geographical position, the name and the history of this town. In the second chapter, we examine the ecclesiastical history of Kastoria’s Metropolis. In the past, Kastoria’s Bishopric belonged to Thessaloniki’s Metropolis but from the beginning of the 11th century until 1767, Kastoria’s Bishopric belonged to the Autonomous Archbishopric of Achrida (Ohrid). Finally, since1928 it has been spiritually under the jurisdiction of the Ecumenical Patriarchate but administratively of the Autonomous Greek Church. In the third chapter, we present the biographical notes of Kastoria’s Bishops, emphasizing their election and their work. In this period, Kastoria’s Bishops became distinguished in national and in educational matters. The memoranda of their election and the articles of the local newspapers have been the main sources of this thesis, which give us information about the exact time of their election as well as the other candidates. During those years, 12 Bishops served Kastoria’s Metropolis. We should also mention that from 1931 till 1936 Kastoria’s Metropolis remained vacant. In the end, thanks to the study of the memoranda of the election of Kastoria’s Bishops, we succeeded in restoring the Episcopal list.
Solute transport due to Periodic Loading in a Soft Porous Material
Creators: name: Fiori, Matilde
name: Pramanik, Satyajit
name: MacMinn, Christopher W.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In soft porous media, deformation drives solute transport via the intrinsic coupling between flow of the fluid and rearrangement of the pore structure. Solute transport driven by periodic loading, in particular, can be of great relevance in applications including the geomechanics of contaminants in the subsurface and the biomechanics of nutrient transport in living tissues and scaffolds for tissue engineering. However, the basic features of this process have not previously been systematically investigated. Here, we fill this hole in the context of a 1D model problem. We do so by expanding the results from a companion study, in which we explored the poromechanics of periodic deformations, by introducing and analysing the impact of the resulting fluid and solid motion on solute transport. We first characterise the independent roles of the three main mechanisms of solute transport in porous media -- advection, molecular diffusion, and hydrodynamic dispersion -- by examining their impacts on the solute concentration profile during one loading cycle. We next explore the impact of the transport parameters, showing how these alter the relative importance of diffusion and dispersion. We then explore the loading parameters by considering a range of loading periods -- from slow to fast, relative to the poroelastic timescale -- and amplitudes -- from infinitesimal to large. We show that solute spreading over several loading cycle increases monotonically with amplitude, but is maximised for intermediate periods because of the increasing poromechanical localisation of the flow and deformation near the permeable boundary as the period decreases.
Augmenting Organizational Decision-Making with Deep Learning Algorithms: Principles, Promises, and Challenges
Creators: name: Shrestha, Yash Raj
name: Krishna, Vaibhav
name: von Krogh, Georg
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The current expansion of theory and research on artificial intelligence in management and organization studies has revitalized the theory and research on decision-making in organizations. In particular, recent advances in deep learning (DL) algorithms promise benefits for decision-making within organizations, such as assisting employees with information processing, thereby augment their analytical capabilities and perhaps help their transition to more creative work.
Η διαδικασία λήψης αποφάσεων μη υποχρεωτικώς συνταγογραφούμενων φαρμάκων:
Creators: name: Χαλδαιοπούλου, Νεραντζία Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Διαδικασία λήψης αποφάσεων
Μη υποχρεωτικώς συνταγογραφούμενα φάρμακα
Ποιοτική έρευνα
decision making process
OTC drugs
Qualitative research

description: Σκοπός της εργασίας είναι να διερευνήσει και να παρουσιάσει τη συμπεριφορά του καταναλωτή κατά τη διαδικασία λήψης αποφάσεων για την αγορά παραφαρμακευτικών προϊόντων (OTC products) σε ένα φαρμακείο. Εξετάσαμε τη συμπεριφορά των καταναλωτών στις αυθόρμητες αγορές (impulse purchases) αλλά και τους παράγοντες που τους επηρεάζουν. Στην παρούσα έρευνα τονίζεται ο ρόλος του merchandising στο χώρο του φαρμακείου και παρουσιάζονται τα βασικά εργαλεία του, ώστε το merchandising να γίνει ακόμα πιο αποτελεσματικό. Στη συνέχεια αναφερόμαστε στις κατηγορίες και στα βασικά χαρακτηριστικά των παραφαρμακευτικών προϊόντων (OTC products) καθώς και στους παράγοντες αλληλεπίδρασης μεταξύ φαρμακοποιού, καταναλωτών και παραφαρμακευτικών προϊόντων (OTC products). Για να ικανοποιηθούν οι στόχοι της έρευνας χρησιμοποιήθηκε η μέθοδος της ποιοτικής έρευνας και πιο συγκεκριμένα της προσωπικής συνέντευξης (interviewing). Οι ερωτώμενοι της έρευνας κλήθηκαν να απαντήσουν σε ερωτήσεις ανοιχτού τύπου σε φαρμακεία της Βόρειας Ελλάδας, για να καλυφθούν όλα τα ερωτήματα που τέθηκαν στους ερευνητικούς στόχους. Η διερεύνηση των παραγόντων που επηρεάζουν τη διαδικασία λήψης αποφάσεων, μας έδωσαν δεδομένα, από την επεξεργασία των οποίων προκύπτουν πολύτιμα συμπεράσματα, για το βαθμό στον οποίο οι καταναλωτές είναι επιρρεπείς σε αυθόρμητες αγορές και για τη σημαντικότητα του ρόλου του σωστού merchandising στην ικανοποίηση των πελατών όσο και στην επίτευξη των εμπορικών στόχων των φαρμακοποιών.
description: The aim of the present thesis is to study and present the consumer’s behaviour on the decision making process during the purchase of OTC drugs in a pharmacy. We examined not only, consumer’s behaviour on impulse purchases but also the affective factors. On the present research worths to be highlighted the role of merchandising on the pharmacy area, and to be introduced the basic tools, so as the merchandising to be more effective. Furthermore, we present the categories and the fundamental characteristic of OTC drugs and the interaction’s elements among the pharmacist, the consumers and the OTC drugs. In order, the targets of this research to be satisfied, we used the method of qualitative search and specifically, of personal interviewing. The study’s interviewers were asked to answer open-ended questions in pharmacies of North Greece, in order to be covered all the research objectives. The examination of the affective factors, gave out facts, which after being elaborated, helped us come to a conclusion about the degree of the consumer’s being prone to impulsive purchases and the importance of the merchandising’s role, not only in consumer’s satisfaction but also in the attainment of the commercial targets of pharmacists.
Προστασία προσωπικών δεδομένων στα κοινωνικά δίκτυα:
Creators: name: Λιούπα, Αννα Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Ιστοσελίδες κοινωνικής δικτύωσης
Facebook
Ιδιωτικότητα
Προσωπικά Δεδομένα
Social Networking
Privacy
Personal Data

description: Η μελέτη αυτή έχει ως σκοπό να ελέγξει εάν προστατεύονται τα προσωπικά δεδομένα των χρηστών των υπηρεσιών των κοινωνικών ιστοσελίδων. Στην αρχή γίνεται ανάλυση του ορισμού της έννοιας της κοινωνίας της πληροφορίας, της αξίας της πληροφορίας. Στην συνέχεια γίνεται μια αναφορά στο ιστορικό των υπηρεσιών αυτών και οι λόγοι της επιτυχίας τους. Γίνεται μετά μια παρουσίαση της ιστοσελίδας Facebook γιατί αποτελεί φαινόμενο στο είδος του στην εποχή μας. Επίσης, ελέγχθηκε η χρήση των ιστοσελίδων αυτών ως προς την πρόοδο άλλων επιστημών και η προστασία της ιδιωτικότητας των χρηστών όπως ορίζει η νομοθεσία στην Ελλάδα, στην Ευρώπη και στην Αμερική. Τέλος δίνονται αποτελέσματα της χρήσης τους, αλλά και μια σειρά μέτρων από την πλευρά της νομοθεσίας αλλά και της πληροφορικής.
description: This study has as aim to check the personal data of users of services of social web pages are protected. In the beginning becomes analysis of definition of significance of society of information, value of information. Then become a report in the background of these services and the reasons of their success. Becomes afterwards a presentation of web page Facebook because it constitutes phenomenon in his type in our season. Also, were checked the use of this web pages as for the progress of other sciences and the protection of privacy of users as fixes the legislation in Greece, in Europe and in America. Finally are given results of their use, but also a line of mesures from the side of legislation of but also information technology.
On the linear representations of the symmetry groups of single-wall carbon nanotubes
Creators: name: Cotfas, Nicolae
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Group Theory (math.GR)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 20C35; 81V55

description: The positions of atoms forming a carbon nanotube are usually described by using a system of generators of the symmetry group. Each atomic position corresponds to an element of the set Z x {0,1,...,n} x {0,1}, where n depends on the considered nanotube. We obtain an alternate rather different description by starting from a three-axes description of the honeycomb lattice. In our mathematical model, which is a factor space defined by an equivalence relation in the set {(v_0,v_1,v_2)\in Z^3 | v_0+v_1+v_2\in {0,1}}, the neighbours of an atomic position can be described in a simpler way, and the mathematical objects with geometric or physical significance have a simpler and more symmetric form. We present some results concerning the linear representations of single-wall carbon nanotubes in order to illustrate the proposed approach.
description: Major change of content. More details will be available at http://fpcm5.fizica.unibuc.ro/~ncotfas
Η εφαρμογή του πλαισίου της Βασιλείας ΙΙ ως προς τα χρηματοπιστωτικά ιδρύματα:
Creators: name: Βαφείδου, Ολγα Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Πιστωτικός Κίνδυνος
Πυλώνες
Κεφαλαιακή Επάρκεια
Τυποποιημένη Προσέγγιση
Προσέγγιση Εσωτερικών Διαβαθμίσεων (ΠΕΔ)
Credit Risk
Pillars
Capital Adequacy
Standardized Approach
Internal Ratings Based Approach (IRB)

description: Σκοπός της διπλωματικής, η σφαιρική μελέτη του βαθμού υιοθέτησης των υποδείξεων του συμφώνου της Βασιλείας ΙΙ από τα ελληνικά χρηματοπιστωτικά ιδρύματα, για την προάσπισή τους, κυρίως από τον πιστωτικό κίνδυνο. Συλλέχθηκαν και συγκρίθηκαν οι δημοσιοποιήσεις των ελληνικών τραπεζών της περιόδου 2008 – 2009, οι οποίες κατηγοριοποιήθηκαν σε μεγάλες και μικρομεσαίες, καθώς και ορισμένων τραπεζών της Ευρωπαϊκής Ένωσης. Τα αποτελέσματα τμηματοποιήθηκαν σε δύο ενότητες. Η πρώτη περιλαμβάνει την γενική εικόνα των ιδρυμάτων σχετικά με την κεφαλαιακή τους επάρκεια και τις ελάχιστες κεφαλαιακές απαιτήσεις ανά κίνδυνο αλλά κυρίως του πιστωτικού κινδύνου, όπως ορίζει ο Πυλώνας I. Η δεύτερη άπτεται της διαχείρισης του πιστωτικού κινδύνου, τις πολιτικές προβλέψεών του, τις τεχνικές μείωσης κλπ. όπως προτάσσει ο Πυλώνας II. Τα αποτελέσματα της έρευνας έδειξαν πως τα ελληνικά ιδρύματα προσαρμόστηκαν στα όσα ορίζει το σύμφωνο ταχύτατα. Δυστυχώς όμως, για την αξιολόγηση του πιστωτικού κινδύνου εφαρμόζουν μόνο την τυποποιημένη προσέγγιση, κάτι που δεικνύει πως συμπεριφέρονται συντηρητικά και κατά συνέπεια δεν καθίστανται ανταγωνιστικά, παρόλο που η τάση των μεγάλων χρηματοδοτικών ανοιγμάτων τους, δεν διαφέρει με την τάση των ευρωπαϊκών ιδρυμάτων. Επιπρόσθετα, εγείρεται και πάλι το θέμα της συγχώνευσης των ελληνικών τραπεζών που είναι δυσανάλογα του πληθυσμού της χώρας
description: The purpose of this thesis is to study how Greek financial institutions adopted the Basel Accord II in order to protect themselves from credit risk. Disclosures of Greek banks and some European institutions were collected for period 2008-2009, a comparison was made and banks were categorized as large and small/medium. Results were distributed into two groups. The first group depicts a general image of the institutions’ capital adequacy and their minimum capital requirements of risks but mainly of credit risk, as defined by Pillar I. The second group is about credit risk management, as suggested by Pillar II. The results from the research show that Greek institutions implemented the Accord swiftly. But they only use the standardized approach to assess credit risk which is an indication of conservative behavior and makes them less competitive than the European institutions. Another issue which is raised is that of the potential merging of institutions, as their number is disproportionate to the country’s population.
Disturbance Observer
Creators: name: Shim, Hyungbo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Disturbance observer is an inner-loop output-feedback controller whose role is to reject external disturbances and to make the outer-loop baseline controller robust against plant's uncertainties. Therefore, the closed-loop system with the DOB approximates the nominal closed-loop by the baseline controller and the nominal plant model with no disturbances. This article presents how the disturbance observer works under what conditions, and how one can design a disturbance observer to guarantee robust stability and to recover the nominal performance not only in the steady-state but also for the transient response under large uncertainty and disturbance.
High quality Nelson-Barr solution to the strong CP problem with $θ=π$
Creators: name: Perez, Gilad
name: Shalit, Aviv
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss composite UV completions of the Nelson-Barr(NB) solution to the strong CP problem. In our construction, the CP symmetry is broken spontaneously by the dynamics of a hidden QCD at $θ=π$. We focus on the minimal implementation of the NB construction where the visible sector contains one extra pair of vector-like up/down quarks. We show that the minimal NB theory suffers from a quality problem, and discuss how composite UV completions may resolve it. We present a simple calculable scheme, free of a quality problem, where dynamical CP violation in the hidden sector is mediated through a scalar portal to the visible sector, which successfully realizes the NB construction.
description: 28 pages, 6 Figures
Lifshitz tails for a class of Schrödinger operators with random breather-type potential
Creators: name: Kirsch, Werner
name: Veselic', Ivan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35J10, 82B44

description: We derive bounds on the integrated density of states for a class of Schrödinger operators with a random potential. The potential depends on a sequence of random variables, not necessarily in a linear way. An example of such a random Schrödinger operator is the breather model, as introduced by Combes, Hislop and Mourre. For these models we show that the integrated density of states near the bottom of the spectrum behaves according to the so called Lifshitz asymptotics. This result can be used to prove Anderson localization in certain energy/disorder regimes.
A toy model of open membrane field theory in constant 3-form flux
Creators: name: Ho, Pei-Ming
name: Matsuo, Yutaka
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Based on an explicit computation of the scattering amplitude of four open membranes in a constant 3-form background, we construct a toy model of the field theory for open membranes in the large C field limit. It is a generalization of the noncommutative field theories which describe open strings in a constant 2-form flux. The noncommutativity due to the B-field background is now replaced by a nonassociative triplet product. The triplet product satisfies the consistency conditions of lattice 3d gravity, which is inherent in the world-volume theory of open membranes. We show the UV/IR mixing of the toy model by computing some Feynman diagrams. Inclusion of the internal degree of freedom is also possible through the idea of the cubic matrix.
description: 31 pages, latex, 2 eps figures
FUV and X-ray Observations of the Reverse Shock in the SMC SNR 1E 0102.2-7219
Creators: name: Sasaki, Manami
name: Gaetz, Terrance J.
name: Blair, William B.
name: Edgar, Richard J.
name: Morse, Jon A.
name: Plucinsky, Paul P.
name: Smith, Randall K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present FUSE and XMM-Newton data for the reverse shock of the O-rich SNR 1E0102.2-7219 in the SMC. The FUSE observations cover three regions with significantly different optical [O III] intensities, all associated with the relatively bright part of the X-ray ring. Emission lines of O VI 1032, 1038 are clearly detected in the FUSE spectra. By combining this O VI doublet emission with the O VII triplet and O VIII Lyalpha fluxes from the XMM-Newton spectra and assuming a non-equilibrium ionization model with a single ionization timescale for the spectra, we are able to find a narrow range of temperatures and ionization timescales that are consistent with the respective line ratios. However, if we assume a plane-parallel shock model with a distribution of ionization timescales, the O VI emission appears to be inconsistent with O VII and O VIII in X-rays. We also analyze the total XMM-Newton EPIC-MOS 1/2 spectra for the three regions. The X-ray spectra are dominated by strong emission lines of O, Ne, and Mg, however, we detect an emission component that accounts for 14 - 25% of the flux and can be attributed to shocked ISM. We find that there is no consistent set of values for the temperature and ionization timescale which can explain the observed line ratios for O, Ne, and Mg. This would be consistent with a structured distribution of the ejecta as the O, Ne, Mg would have interacted with the reverse shock at different times.
description: 28 pages, 5 figues, Fig. 1 as JPEG. To be published in ApJ (01 May 2006, v. 642, 1 issue)
Spreading of viscoplastic droplets
Creators: name: Jalaal, Maziyar
name: Stoeber, Boris
name: Balmforth, Neil
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The spreading under surface tension and gravity of a droplet of yield-stress fluid over a thin film of the same material is studied. The droplet converges to a final equilibrium shape once the driving stresses inside the droplet fall below the yield stress. Scaling laws are presented for the final radius and complemented with an asymptotic analysis for shallow droplets. Moreover, numerical simulations using the volume-of-fluid method and a regularized constitutive law, and experiments with an aqueous solution of Carbopol are presented.
description: 18 pages, 12 figures
Finite Temperature Phase Diagram of a Two-Component Fermi Gas with Density Imbalance
Creators: name: He, Lianyi
name: Jin, Meng
name: Zhuang, Pengfei
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We investigated possible superfluid phases at finite temperature in a two-component Fermi gas with density imbalance. In the frame of a general four-fermion interaction theory, we solved in the BCS region the gap equations for the pairing gap and pairing momentum under the restriction of fixed number densities, and analyzed the stability of different phases by calculating the superfluid density and number susceptibilities. The homogeneous superfluid is stable only at high temperature and low number asymmetry, the inhomogeneous LOFF survives at low temperature and high number asymmetry, and in between them there exists another possible inhomogeneous phase, that of phase separation. The critical temperatures and the orders of the phase transitions among the superfluid phases and normal phase are calculated analytically and numerically. The phase diagram we obtained in the temperature and number asymmetry plane is quite different from the one in temperature and chemical potential difference plane for a system with fixed chemical potentials.
description: Final published version
A study of a membrane-associated protease of porphyromonas gigngivalis W83
Creators: name: Park, Yoonsuk
Publisher: name: University of British Columbia
Year: 2009

description: A protease gene (tpr) of Porphyromonas gingivalis W83 was cloned and expressed in Escherichia coli. The recombinant protease with an apparent molecular mass of 90 kDa was detected as a proteolytic band on bovine serum albumin (BSA)-substrate zymogram and characterized as a thiol-dependent protease. Western immunoblot analysis and in-vitro translation showed that the tpr gene encodes a 50-kDa polypeptide, suggesting that the 90- kDa active protease may be composed of a subunit having a molecular mass 50 kDa. The recombinant protein was expressed at high levels using a T7 RNA polymerase/promoter system. Antiserum raised to the recombinant protein was reactive to a native P. gingivalis protein with a molecular mass of 80 kDa. A specific protease (Tpr)-deficient isogenic mutant, P. gingivalis W83/PM, was generated by homologous recombination between P. gingivalis W83 chromosomal DNA and a suicide plasmid carrying the inactivated tpr gene in which a portion of the gene was replaced with an erythromycin resistance gene. Gelatin-substrate zymography and Western immunoblot analysis showed that W83/PM did not express the 80-kDa protein seen in the parent strain. Compared with W83, the mutant W83/PM showed a greatly reduced ability to hydrolyze the bacterial collagenase substrate, p-phenylazobenzyloxycarbonyl-L-prolyl-leucyl-glycyl-Lprolyl- D-arginine (Pz-peptide). The enzyme is associated with the cell membrane of W83. The Pz-peptidase activity of P. gingivalis W83 was characterized. No significant differences were found in the ability of W83 or W83/PM to hydrolyze collagen, or in their pathogenicity in a mouse model. To determine the role of Tpr in nutrient uptake by P. gingivalis, W83 and W83/PM were cultivated in media containing limiting amounts of amino acid/peptide nutrients and in the growth limiting media supplemented with BSA or gelatin. The growth of both strains was enhanced by BSA or gelatin. Cells of W83 grown in the nutrient limited media expressed higher levels of Tpr. A complementation study was performed by introducing the recombinant shuttle plasmid pBY3 containing the tpr gene into W83/PM. Expression of Tpr by the complemented strain was observed by gelatin-substrate zymography, Western immunoblot analysis and Pz-peptidase assay.
Quantum Candies and Quantum Cryptography
Creators: name: Lin, Junan
name: Mor, Tal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics Education (physics.ed-ph)
subject: Cryptography and Security (cs.CR)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The field of quantum information is becoming more known to the general public. However, effectively demonstrating the concepts underneath quantum science and technology to the general public can be a challenging job. We investigate, extend, and much expand here "quantum candies" (invented by Jacobs), a pedagogical model for intuitively describing some basic concepts in quantum information, including quantum bits, complementarity, the no-cloning principle, and entanglement. Following Jacob's quantum candies description of the well known quantum key distribution protocol BB84, we explicitly demonstrate various additional quantum cryptography protocols using quantum candies in an approachable manner. The model we investigate can be a valuable tool for science and engineering educators who would like to help the general public to gain more insights about quantum science and technology: most parts of this paper, including many protocols for quantum cryptography, are expected to be easily understandable by a layperson without any previous knowledge of mathematics, physics, or cryptography.
description: To be presented at the 9th International Conference on the Theory and Practice of Natural Computing (TPNC 2020; postponed and merged with TPNC 2021). The final authenticated publication is available online at https://doi.org/10.1007/978-3-030-63000-3_6
Η locatio conductio ως πλαίσιο συμβατικής δέσμευσης στο χώρο των εργασιακών σχέσεων κατά το κλασικό ρωμαϊκό δίκαιο.:
Creators: name: Μαυρομουστάκη, Δέσποινα Παρασκευά
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Κλασικό Ρωμαϊκό Δίκαιο.
Μίσθωση.
Εργασιακές σχέσεις.
Classical Roman Law.
Locatio Conductio.
Employment relationships.

description: Αντικείμενο της παρούσας εργασίας αποτελούν οι συμβατικές εργασιακές σχέσεις, όπως διαμορφώθηκαν στο ιδιωτικό Ρωμαϊκό δίκαιο της κλασικής εποχής, με βάση τις πηγές της εποχής και τις θεωρίες που έχουν αναπτυχθεί από διάφορους μελετητές. Στο κλασικό ρωμαϊκό δίκαιο η παροχή εργασίας με χρηματικό αντάλλαγμα, μπορούσε να συμφωνηθεί υπό δύο συμβατικές μορφές, υπό τη μορφή της locatio conductio operarum, την οποία με σημερινή ορολογία θα χαρακτηρίζαμε ως σύμβαση εξαρτημένης εργασίας και της locatio conductio operis, την οποία θα χαρακτηρίζαμε ως σύμβαση έργου. Για την διεξοδική εξέταση των ανωτέρω δύο συμβάσεων, αρχικά κάναμε μια συνοπτική παρουσίαση του οικονομικού και κοινωνικού πλαισίου της Ρώμης της κλασικής εποχής και των αντιλήψεων των Ρωμαίων για την εργασία, καθώς και μια σύντομη αναφορά στη σύμβαση της locatio conductio στη γενική της μορφή και στη συνέχεια προχωρήσαμε στην ανάλυση των δύο υποκατηγοριών της, που αφορούν στις εργασιακές σχέσεις.
description: The purpose of this study are the contractual employment relationships, as elaborated in the private law of the Roman Classical period, based on contemporary sources and theories developed by various scholars. In classical Roman law, employment with money exchange, could be agreed within two contract forms, in the form of locatio conductio operarum, which in today's terminology would characterize as a contract of employment and locatio conductio operis, which would characterize as a contract work. For a thorough examination of these two agreements, first made a brief presentation of the economic and social framework of the classical period of Rome and Roman perceptions of the work and a brief mention in the contract of locatio conductio in its general form and then proceeded to analyze the two subcategories, which are relevant to employment relationships.
Quaternion Dirac Equation and Supersymmetry
Creators: name: Rawat, Seema
name: Negi, O. P. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Quaternion Dirac equation has been analyzed and its supersymetrization has been discussed consistently. It has been shown that the quaternion Dirac equation automatically describes the spin structure with its spin up and spin down components of two component quaternion Dirac spinors associated with positive and negative energies. It has also been shown that the supersymmetrization of quaternion Dirac equation works well for different cases associated with zero mass, non zero mass, scalar potential and generalized electromagnetic potentials. Accordingly we have discussed the splitting of supersymmetrized Dirac equation in terms of electric and magnetic fields.
On the trace anomaly of Chaudhuri-Choi-Rabinovici model
Creators: name: Nakayama, Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently a non-supersymmetric conformal field theory with an exactly marginal deformation in the large $N$ limit was constructed by Chaudhuri-Choi-Rabinovici. On a non-supersymmetric conformal manifold, $c$ coefficient of the trace anomaly in four dimensions would generically change. In this model, we, however, find that it does not change at the first non-trivial order given by three-loop diagrams.
description: 5 pages, 1 figure