cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Resilient Dynamic State Estimation for Power System Using Cauchy-Kernel-Based Maximum Correntropy Cubature Kalman Filter
Creators: Y. Wang, Z. Yang, Y. Wang, Z. Li, V. Dinavahi, J. Liang
Publisher: name: University of Alberta Library
Year: 2023

Accurate estimation of dynamic states is the key to monitoring power system operating conditions and controlling transient stability. However, the inevitable non-Gaussian noise and randomly occurring denial-of-service (DoS) attacks may deteriorate the performance of standard filters seriously. To deal with these issues, a novel resilient cubature Kalman filter based on the Cauchy kernel maximum correntropy optimal criterion approach (termed CKMC-CKF) is developed, in which the Cauchy kernel function is utilized to describe the distance between vectors. Specifically, the errors of state and

measurement in the cost function are unified by a statistical linearization technique, and the optimal estimated state is acquired by the fixed-point iteration method. Due to the salient thick-tailed feature and the insensitivity to the kernel bandwidth of Cauchy kernel function, the proposed CKMC-CKF can effectively mitigate the adverse effect of non-Gaussian noise and DoS attacks with a better numerical stability. Finally, the efficacy of the proposed method is demonstrated on the standard IEEE 39-bus system under various abnormal conditions. Compared with standard cubature Kalman filter (CKF) and maximum correntropy criterion CKF (MCC-CKF), the proposed algorithm reveals better estimation accuracy and stronger resilience.
The behavioural traits and characteristics of high and low expectation/growth entrepreneurs: is there a difference?
Creators: name: Birdthistle, Naomi
name: Hynes, Briga
name: Costin, Yvonne
name: Lucey, S.
Publisher: name: University of Limerick
Year: 2023

description: Purpose: This exploratory study examines the behavioural traits and characteristics of entrepreneurs of high and low-expectation/growth companies in Ireland. In particular an emphasis is placed on: the demographic profile of the entrepreneur and their business; occupational background; educational attainment; and the motivational factors influencing new venture creation.
Approach: The research involves a two-stage study with the first phase focusing on an extensive literature review of the key sources of secondary research including reports, articles, and publications. The second stage of the exploratory study involves surveying owner-managers of high and low-expectation/growth businesses. The scales in the questionnaire were developed in a theory-driven manner.
Results: The results indicate that there are a number of key differences between high expectation/growth and low expectation/growth entrepreneurs. The most consistent differences relate to their education, the industry sector they are operating in and the procedures behind planning for the business. Furthermore, the study identifies different financing methods adopted by the entrepreneurs on starting and growing the business.
Topological Order at Non-zero Temperature
Creators: name: Hastings, M. B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a definition for topological order at nonzero temperature in analogy to the usual zero temperature definition that a state is topologically ordered, or "nontrivial", if it cannot be transformed into a product state (or a state close to a product state) using a local (or approximately local) quantum circuit. We prove that any two dimensional Hamiltonian which is a sum of commuting local terms is not topologically ordered at $T>0$. We show that such trivial states cannot be used to store quantum information using certain stringlike operators. This definition is not too restrictive, however, as the four dimensional toric code does have a nontrivial phase at nonzero temperature.
description: 4 pages, 1 figure; added appendix describing toy example and also showing triviality of three dimensional toric code at T>0
Circle Decompositions of Surfaces
Creators: name: Moussong, Gábor
name: Simányi, Nándor
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Topology (math.GN)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57N05, 54F99

description: We determine which connected surfaces can be partitioned into topological circles. There are exactly seven such surfaces up to homeomorphism: those of finite type, of Euler characteristic zero, and with compact boundary components. As a byproduct, we get that any circle decomposition of a surface is upper semicontinuous.
description: 9 pages, final version, to appear in Topology and its Applications (2010). A few missprints have been corrected
Nuclear corrections in neutrino-nucleus DIS and their compatibility with global NPDF analyses
Creators: name: Kovarik, K.
name: Schienbein, I.
name: Olness, F.
name: Yu, J. Y.
name: Keppel, C.
name: Morfin, J. G.
name: Owens, J. F.
name: Stavreva, T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We perform a global chi^2-analysis of nuclear parton distribution functions using data from charged current neutrino-nucleus deep-inelastic scattering (DIS), charged-lepton-nucleus DIS, and the Drell-Yan (DY) process. We show that the nuclear corrections in nu-A DIS are not compatible with the predictions derived from l^+A DIS and DY data. We quantify this result using a hypothesis-testing criterion based on the chi^2 distribution which we apply to the total chi^2 as well as to the chi^2 of the individual data sets. We find that it is not possible to accommodate the data from nu-A and l^+A DIS by an acceptable combined fit. Our result has strong implications for the extraction of both nuclear and proton parton distribution functions using combined neutrino and charged-lepton data sets.
description: 5 pages
Lower-dimensional Horava-Lifshitz gravity
Creators: name: Sotiriou, Thomas P.
name: Visser, Matt
name: Weinfurtner, Silke
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider Horava-Lifshitz gravity in both 1+1 and 2+1 dimensions. These lower-dimensional versions of Horava-Lifshitz gravity are simple enough to be explicitly tractable, but still complex enough to be interesting. We write the most general (non-projectable) action for each case and discuss the resulting dynamics. In the 1+1 case we utilize the equivalence with 2-dimensional Einstein-aether theory to argue that, even though non-trivial, the theory does not have any local degrees of freedom. In the 2+1 case we show that the only dynamical degree of freedom is a scalar, which qualitatively has the same dynamical behaviour as the scalar mode in (non-projectable) Horava-Lifshitz gravity in 3+1 dimensions. We discuss the suitability of these lower-dimensional theories as simpler playgrounds that could help us gain insight into the 3+1 theory. As special cases we also discuss the projectable limit of these theories. Finally, we present an algorithm that extends the equivalence with (higher order) Einstein-aether theory to full Horava-Lifshitz gravity (instead of just the low energy limit), and we use this extension to comment on the apparent naturalness of the covariant formulation of the latter.
description: v2: 9 pages, discussion about projectable version as a limiting case added; v3: minor changes to match published version
Species assembly in model ecosystems, II: Results of the assembly process
Creators: name: Capitan, Jose A.
name: Cuesta, Jose A.
name: Bascompte, Jordi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: In the companion paper of this set (Capitan and Cuesta, 2010) we have developed a full analytical treatment of the model of species assembly introduced in Capitan et al. (2009). This model is based on the construction of an assembly graph containing all viable configurations of the community, and the definition of a Markov chain whose transitions are the transformations of communities by new species invasions. In the present paper we provide an exhaustive numerical analysis of the model, describing the average time to the recurrent state, the statistics of avalanches, and the dependence of the results on the amount of available resource. Our results are based on the fact that the Markov chain provides an asymptotic probability distribution for the recurrent states, which can be used to obtain averages of observables as well as the time variation of these magnitudes during succession, in an exact manner. Since the absorption times into the recurrent set are found to be comparable to the size of the system, the end state is quickly reached (in units of the invasion time). Thus, the final ecosystem can be regarded as a fluctuating complex system where species are continually replaced by newcomers without ever leaving the set of recurrent patterns. The assembly graph is dominated by pathways in which most invasions are accepted, triggering small extinction avalanches. Through the assembly process, communities become less resilient (e.g., have a higher return time to equilibrium) but become more robust in terms of resistance against new invasions.
description: 14 pages, 13 figures. Revised version
Οι Δοξολογίες κατά το 1750-1850 μέσα από τους χειρόγραφους κώδικες του Αγίου Όρους
Creators: name: Μαμάτσιος, Δημήτριος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Αγιορείτικη Ψαλτική Παράδοση
Μελουργία
Δοξολογίες
Chanting Tradition of Holy Mount
Melody Composition
Doxologies

description: Η εργασία παρουσιάζει τη μελοποίηση των Δοξολογιών κατά τα έτη 1750-1850, όπως αυτή εμφανίζεται στους χειρόγραφους κώδικες του Αγίου Όρους. Παρουσιάζεται το υμνογραφικό είδος της Δοξολογίας καθώς και οι πολλαπλές μελοποιητικές εκδοχές της στα αθωνικά χειρόγραφα. Η εργασία συνοδεύεται και από σύντομα βιο-εργογραφικά στοιχεία των μελοποιών των εν λόγω Δοξολογιών. Όπου είναι εφικτό, ανιχνεύονται κοινές θέσεις κι επισημαίνονται διαφοροποιήσεις.
description: This current thesis presents the composition of Doxologies during the years 1750-1850, as it appears in the manuscript codices of Mount Athos. The hymnographic genre of Doxology is examined as well as its multiple melodic versions as they can be found in the Athonite manuscripts. The thesis is also accompanied by brief bio-ergographic data of the composers of the Doxologies in question. Where possible, common positions are detected and differences highlighted.
Swansea Blitz: latest research into bombing, targets, and using GIS as a research tool
Creators: name: Robins, Nigel A
Publisher: name: Zenodo
Year: 2021
Subjects: Swansea Blitz, Luftwaffe, GIS, Incendiaries, Economic warfare, bomb disposal,

description: A slides and notes copy of a talk about by 1940s air war research as part of commemorations of the anniversary of the 1941 air attacks on Swansea. This set concentrates more on wider aspects of the air war and understanding of the nature of 1940s air attacks. Techniques discussed were primary sources, archives, open source intelligence and using modern GIS as a research tool.
Physical characterisation of urban cyclists for advanced bicycle travel models
Creators: name: Tengattini, Simone
Publisher: name: University of British Columbia
Year: 2018

description: Urban cyclist’s physical characteristics are important for advanced modelling of bicycle speed and energy expenditure, with applications including infrastructure design, network analysis, and health and safety assessments. However, representative values for diverse urban travellers have not been established. This study investigates the physical characteristics of real-world urban cyclists, including rolling and drag resistance parameters, and bicycle and cargo masses. Relationships among physical characteristics socio-demographics and travel behaviour are also analysed, and a bicycle cruising speed model is derived to illustrate usefulness of the sought parameters. Firstly, a 12-sensor, 100-meter coast-down test setup is developed and indoor and outdoor validation tests are performed. Outdoor validation tests generate rolling resistance coefficient estimates of 0.0064 ±0.0013 and effective frontal area estimates of 0.63 ±0.11 m². Secondly, resistance parameters were measured utilizing the novel coast-down test for 557 intercepted cyclists in Vancouver, Canada.. The average (standard deviation) of coefficient of rolling resistance (𝐶𝑟), effective frontal area (𝐴𝑓𝐶𝑑), bicycle plus cargo mass, and bicycle-only mass were 0.0077 (0.0036), 0.559 (0.170) m², 18.3 (4.1) kg, and 13.7 (3.3) kg, respectively. The range of measured values is wider and higher than suggested in the literature. Thirdly, the sample of intercepted cyclists is categorised based on observed physical attributes of the bicycle and rider. Three typologies defined through cluster analysis were identified as Road (R), Hybrid (H) and Mountain (M) style urban cyclists. The analysis indicates that cycling efficiency, perceptions, preferences, and habits are related to physical typology in a complex but consistent manner. M, H, and R cyclists are, in that order, increasingly more efficient, more comfortable in mixed traffic, more II consistently year-round cyclists, self-reportedly faster, and engage in more physical activity. Physical typologies might help unveil new motivations in active travel behaviour and encourage urban cycling by a wider range of people. Finally, a mathematical framework is derived from first principles to determine speed from cyclist characteristics (power output, gearing, resistance parameters) and roadway attributes. Application of the speed estimation framework to the problem of traffic signal clearance interval timing illustrates the utility for probabilistic, context- sensitive roadway design.
Equality Saturation: A New Approach to Optimization
Creators: name: Tate, Ross
name: Stepp, Michael
name: Tatlock, Zachary
name: Lerner, Sorin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences
subject: D.3.4

description: Optimizations in a traditional compiler are applied sequentially, with each optimization destructively modifying the program to produce a transformed program that is then passed to the next optimization. We present a new approach for structuring the optimization phase of a compiler. In our approach, optimizations take the form of equality analyses that add equality information to a common intermediate representation. The optimizer works by repeatedly applying these analyses to infer equivalences between program fragments, thus saturating the intermediate representation with equalities. Once saturated, the intermediate representation encodes multiple optimized versions of the input program. At this point, a profitability heuristic picks the final optimized program from the various programs represented in the saturated representation. Our proposed way of structuring optimizers has a variety of benefits over previous approaches: our approach obviates the need to worry about optimization ordering, enables the use of a global optimization heuristic that selects among fully optimized programs, and can be used to perform translation validation, even on compilers other than our own. We present our approach, formalize it, and describe our choice of intermediate representation. We also present experimental results showing that our approach is practical in terms of time and space overhead, is effective at discovering intricate optimization opportunities, and is effective at performing translation validation for a realistic optimizer.
description: 80 pages, 39 figures
Modellerstellung für die Rohrdekontamination mittels hochfrequenter Schlagwirkung
Creators: name: Aminy, Akramullah
Publisher: name: Karlsruhe
Year: 2014

description: Diese Arbeit befasst sich mit der Entwicklung eines neuen Abtragverfahrens für Rohrablagerungen. Der Wirkmechanismus dieses Verfahrens basiert auf der Einbringung einer hochfrequenten Schlagbeanspruchung mittels eines geometrisch bestimmten Werkzeugs. Mithilfe der deskriptiven Statistik wird die hochdynamische Beanspruchung beschrieben und in einem Beanspruchungsmodell zusammengefasst. Zum Schluss wird die Effektivität des Abtragverfahrens unter verschiedenen Randbedingungen aufgezeigt.
Gemeinsam in die Zukunft? Publikationsrepositorien und Forschungsinformationssysteme an Universitäten
Creators: name: Tobias, Regine
name: Müller, Uwe
name: Scholze, Frank
Publisher: name: Karlsruhe
Year: 2014
Subjects: Dokumentenserver
Open Access
Schnittstelle

description: Institutionelle Repositorien und Forschungsinformationssysteme (FIS) sind wichtige Bestandteile der universitären Informationsinfrastruktur. Während Repositorien und die dazugehörigen Dienste auf die wissenschaftlichen Publikationen und damit die publizierten Forschungsergebnisse fokussiert sind, nehmen FIS den Forschungsprozess als Ganzes und insbesondere aus Administrations-, Dokumentations- und Evaluationsperspektive in den Blick. Auch wenn die inhaltlichen Überschneidungen beider Bereiche auf der Hand liegen und die Potentiale einer Verzahnung vielfältig sind, stecken die Aktivitäten hinsichtlich einer tatsächlichen Integration noch in den Kinderschuhen. Die Ursachen reichen von einer oftmals verteilten Zuständigkeit innerhalb der Universitäten über die Tatsache, dass Repositorien nur Publikationen mit elektronischen Volltexten nachweisen während FIS auf die Vollständigkeit der Daten (zumeist in Form bibliografischer Angaben) angewiesen sind, bis hin zu unterschiedlichen Datenformaten und technischen Inkompatibilitäten. Zudem ist die Verbreitung von FIS noch sehr gering.
Der Workshop gibt einen Aufriss der Problemlage und zeigt anhand konzeptioneller Überlegungen und ausgewählter Best-Practice-Beispiele aus Deutschland sowie aus dem europäischen Ausland Lösungsmöglichkeiten für eine stärkere organisatorische und technische Integration von Repositorien und FIS auf. Einen weiteren Schwerpunkt bilden mögliche technische Schnittstellen für den Datenaustausch zwischen den unterschiedlichen Systemen. Schließlich soll es um die Frage gehen, wie ein Kriterien- und Anforderungskatalog für FIS entwickelt werden kann, wie er für Repositorien in Form des DINI-Zertifikats seit zehn Jahren existiert, und wie das DINI-Zertifikat selbst um Aspekte der Interoperabilität mit FIS erweitert werden kann.
Die Veranstaltung wird von den beiden DINI-Arbeitsgruppen „Forschungsinformationssysteme“ und „Elektronisches Publizieren“ organisiert, die seit einiger Zeit eng zusammenarbeiten.
Führungskompetenzen der Zukunft: Eine qualitative Untersuchung zur Personalführung im dynamischen Umfeld von Sozialdiensten
Creators: name: Bieri, Anna-Maria
Publisher: name: Zenodo
Year: 2021

description: Der Alltag von Führungspersonen ist zunehmend geprägt von schnellen Veränderungen, unvorhersehbaren Ereignissen sowie komplexen und multipel deutbaren Ausgangslagen. Führungspersonen öffentlicher Sozialdienste sind bereits heute aufgrund verschiedener Stakeholder des Öfteren gefordert, Anpassungsleitungen zu vollziehen. Die vorliegende Master-Thesis geht der These nach, dass in Zukunft noch grössere Anpassungsleistungen gefordert werden, für die andere Führungskompetenzen im Fokus stehen als bisher. Konkret befasst sie sich mit notwendigen Kompetenzen von Personalführenden, um zukünftig in diesen fordernden Situationen handlungsfähig zu bleiben. Im Speziellen wird ein Blick auf die Covid-19-Pandemie geworfen. Sie stellte eine aussergewöhnliche Situation dar, in der unkonventionelle Reaktionen und Massnahmen gefordert waren. Empirisch basiert die Analyse auf fünf Expert*inneninterviews mit Führungspersonen öffentlicher Sozialdienste. Die Auswertung mittels einer Inhaltsanalyse hat in Übereinstimmung mit bestehenden Untersuchungen gezeigt, dass Kompetenzen in den Kategorien Sozial- und Personalkompetenzen zentral für Führungspersonen sind. Hervorgehoben wird an dieser Stelle die Kommunikationskompetenz. Im Vergleich zu den bekannten Führungskompetenzen zeigen die Ergebnisse auf, dass für die Zukunft die Kompetenzen Entscheidungsfähigkeit und Ambiguitätstoleranz für die Personalführung am relevantesten erachtet werden. In Anbetracht der Trends, wie der Digitalisierung, braucht es eine vertiefte Auseinandersetzung mit den dafür erforderlichen Kompetenzen in der Praxis und der Lehre der Sozialen Arbeit. Geeignete Personen müssen befähigt werden, um soziale Organisationen zukunftsfähig gestalten zu können.
description: + Code Diss LU: hslusa masa + Fussnote: Master of Science in Sozialer Arbeit, Bern, Luzern, St. Gallen, 2021 + NL-Code: NLLUHSA202109
Positive Solutions for the Discrete Nonlinear Schrödinger Equation: A Priori Estimates and Convergence
Creators: name: Verbitsky, Anton
Publisher: name: Karlsruhe
Year: 2014

description: We consider the discrete nonlinear stationary Schrödinger equation on a bounded n-dimensional box and on the whole space. In the first case we derive the existence of a positive classical solution of the corresponding continuous problem from a uniform a priori bound on positive discrete solutions for a general right hand side. In the second case we derive a uniform a priori bound on positive discrete solutions for the Schrödinger-type nonlinearity.
The effect of primordial non-Gaussianity on the skeleton of cosmic shear maps
Creators: name: Fedeli, C.
name: Pace, F.
name: Moscardini, L.
name: Grossi, M.
name: Dolag, K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: (abridged) We explore the imprints of deviations from Gaussian primordial density fluctuations on the skeleton of the large-scale matter distribution as mapped through cosmological weak lensing. We computed the skeleton length of simulated effective convergence maps covering $\sim 35$ sq. deg each, extracted from a suite of cosmological $n-$body runs with different levels of local primordial non-Gaussianity. The latter is expected to alter the structure formation process with respect to the fiducial Gaussian scenario, and thus to leave a signature on the cosmic web. We found that alterations of the initial conditions consistently modify both the cumulative and the differential skeleton length, although the effect is generically smaller than the cosmic variance and depends on the smoothing of the map prior to the skeleton computation. Nevertheless, the qualitative shape of these deviations is rather similar to their primordial counterparts, implying that skeleton statistics retain good memory of the initial conditions. We performed a statistical analysis in order to find out at what Confidence Level primordial non-Gaussianity could be constrained by the skeleton test on cosmic shear maps of the size we adopted. At 68.3% Confidence Level we found an error on the measured level of primordial non-Gaussianity of $Δf_\mathrm{NL}\sim 300$, while at 90% Confidence Level it is of $Δf_\mathrm{NL}\sim 500$. While these values by themselves are not competitive with the current constraints, weak lensing maps larger than those used here would have a smaller field-to-field variance, and thus would likely lead to tighter constraints. A rough estimate indicates $Δf_\mathrm{NL} \sim$ a few tens at 68.3% Confidence Level for an all-sky weak lensing survey.
description: 11 pages, 9 figures. Accepted for publication on MNRAS
Der Decal-Prozess zur Herstellung katalysatorbeschichteter Membranen für PEM-Brennstoffzellen
Creators: name: Frölich, Konstantin
Publisher: name: Karlsruhe
Year: 2014
Subjects: Brennstoffzelle
Catalyst Coated Membrane
Decal-Prozess
Haftung
Struktureigenschaften

description: Ziel der Arbeit ist die umfassende Untersuchung des Decal-Prozesses zur Herstellung katalysatorbeschichteter Membranen. Dabei werden sowohl das Prozessfenster zum Transfer der Elektroden von Decal-Folie auf Membran, als auch die Auswirkung der Prozessparameter im Tinten- und Transferprozess auf Struktur und Funktion der Materialien wie auch die Reproduzierbarkeit des Prozesses betrachtet. Wesentlicher Bestandteil ist die Auswahl, Implementation und Bewertung von Charakterisierungsmethoden.
Νοηματικός Μουσειολογικός Προγραμματισμός και Σχεδιασμός της περιοδικής έκθεσης: «Εν {θύμησες} Μικρασία: σκιές Μελάνης και Φακού»
Creators: name: Μαριάδης, Χριστόφορος Αβραάμ
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Νοηματικός Μουσειολογικός Προγραμματισμός
Νοηματικός Μουσειολογικός Σχεδιασμός
Περιοδική έκθεση
Μικρασιατική Εκστρατεία
Μικρασιατική Καταστροφή
Εθνικό φαντασιακό
Μελάνη
Φακός
Conceptual Exhibition Planning
Conceptual Exhibition Design
temporary exhibition
Asia Minor Campaign
Asia Minor Catastrophe
Greco-Turkish war (1919-1922)
National imaginary
Ink
Lens

description: Στην παρούσα διπλωματική εργασία παρουσιάζεται και αναλύεται ο Νοηματικός Μουσειολογικός Προγραμματισμός και Σχεδιασμός μιας προτεινόμενης περιοδικής έκθεσης, που φέρει τον τίτλο «Εν {θύμησες} Μικρασία: σκιές Μελάνης και Φακού» και προγραμματίζεται να φιλοξενηθεί στο κτίριο του πρώην Βρεφονηπιακού Σταθμού, στην Προβλήτα Α΄ στο Λιμάνι της Θεσσαλονίκης. Στο στάδιο του Προγραμματισμού παρουσιάζονται τα δεδομένα του προβλήματος με τη σκιαγράφηση των χαρακτηριστικών της Συλλογής, του Κυρίου του Έργου, του Χώρου, του Κοινού, καθώς και του Περιβάλλοντος, στο οποίο θα λάβει χώρα η έκθεση. Η λύση του προβλήματος και η αναλυτική παρουσίαση του μουσειολογικού αφηγήματος, αποτελούν το αντικείμενο του Νοηματικού Μουσειολογικού Σχεδιασμού. Η περιοδική έκθεση επιχειρεί να φωτίσει το δίπολο ανάδειξης-αποσιώπησης συγκεκριμένων πτυχών της Μικρασιατικής Εκστρατείας και Καταστροφής στο πλαίσιο της καλλιέργειας του εθνικού φαντασιακού.
description: The present diploma thesis presents and analyzes the Conceptual Exhibition Planning and Design of a proposed temporary exhibition entitled “In {remembrance of} Asia Minor: shadows of Ink and Lens”, which is planned to be hosted in the building of the former Nursery School, at the Pier No 1, at the Port of Thessaloniki. In the phase of Conceptual Exhibition Planning the data of the problem are presented by outlining the characteristics of the Collection, the Project Owner, the Space, the Public and the Cultural Environment, in which the exhibition will take place. The solution of the problem and the detailed presentation of the exhibition narration are presented in the phase of Conceptual Exhibition Design. The temporary exhibition attempts to shed light on the dipole of highlighting and concealing specific aspects of the Asia Minor Campaign and Catastrophe in the context of the construction of the national imaginary.
description: Σε συνεργασία με: Παιδαγωγικό Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)
69944: The Pitt Rivers Trails App
Creators: name: Project Team, Oxford At War
Publisher: name: University of Oxford
Year: 2023
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: Visit the Pitt Rivers Museum and use this app to find and learn about twelve artefacts related to the First World War. The free app is available for both Android and iPhone devices. It can be downloaded from the App store or Google Play (links on https://www.prm.ox.ac.uk/app )
Strategies to reduce friction losses and their implications for the energy efficient design of internal flow domains
Creators: name: Daschiel, Gertraud Maria
Publisher: name: Karlsruhe
Year: 2014
Subjects: passive flow control
laminar flow
turbulent flow
transition
DNS

description: This work aims at developing a strategy how the energy which has to be applied to transport incompressible and Newtonian fluids through straight ducts can be reduced. Based on the physical properties of laminar and turbulent flow, models are derived which theoretically lead to the reduction of the dissipated energy. The possibility to implement the proposed state due to appropriate design aspects in the cross section shape of the duct is investigated based on numerical simulations of the flow.
title: Возрастные и гендерные характеристики больных Covid-19, проходящих амбулаторное лечение
Creators: name: Егорова, Евгения
name: Андрияшина, Вероника
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2021

description: Тема COVID-19 является одной из самых обсуждаемых в повседневной жизни и сфере здравоохранения. Это связано с высокой заболеваемостью и смертностью людей, а также быстрым распространением инфекции. В данной работе представлены возрастные и гендерные характеристики больных COVID-19, проходивших амбулаторное лечение. Рассмотрена степень влияния возраста пациента на продолжительность лечения и
количество посещений врача.
The flavor puzzle in multi-Higgs models
Creators: name: Blechman, Andrew E.
name: Petrov, Alexey A.
name: Yeghiyan, Gagik
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We reconsider the flavor problem in the models with two Higgs doublets. By studying two generation toy models, we look for flavor basis independent constraints on Yukawa couplings that will give us the mass hierarchy while keeping all Yukawa couplings of the same order. We then generalize our findings to the full three generation Standard Model. We find that we need two constraints on the Yukawa couplings to generate the observed mass hierarchy, and a slight tuning of Yukawa couplings of order 10%, much less than the Standard Model. We briefly study how these constraints can be realized, and show how flavor changing currents are under control for $K-\bar{K}$ mixing in the near-decoupling limit.
description: 26 pages, typos are corrected, references are added, the final version
Finiteness of outer automorphism groups of random right-angled Artin groups
Creators: name: Day, Matthew B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F05, 20F28, 05C80

description: We consider the outer automorphism group Out(A_Gamma) of the right-angled Artin group A_Gamma of a random graph Gamma on n vertices in the Erdos--Renyi model. We show that the functions (log(n)+log(log(n)))/n and 1-(log(n)+log(log(n)))/n bound the range of edge probability functions for which Out(A_Gamma) is finite: if the probability of an edge in Gamma is strictly between these functions as n grows, then asymptotically Out(A_Gamma) is almost surely finite, and if the edge probability is strictly outside of both of these functions, then asymptotically Out(A_Gamma) is almost surely infinite. This sharpens results of Ruth Charney and Michael Farber from their preprint "Random groups arising as graph products", arXiv:1006.3378v1.
description: 29 pages. Mostly rewritten, results tightened, statements corrected, gaps filled
Mass and Angular momentum of Black Holes in New Massive Gravity
Creators: name: Nam, Soonkeon
name: Park, Jong-Dae
name: Yi, Sang-Heon
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We obtain mass and angular momentum of black holes as conserved charges in three dimensional new massive gravity, after presenting the explicit expression for the potential of the conserved charges. This confirms the expression of those charges obtained in several ways, in particular through AdS/CFT correspondence, and shows us that the first law of black hole thermodynamics is valid in these black holes. We also comment about conserved charges in new type black holes with the emphasis on the AdS/CFT correspondence as guiding principle.
description: minor corrections, added conclusion, accepted in PRD
Διαχείριση κρίσεων και Επικοινωνία: Η περίπτωση του Εθνικού Παρατηρητηρίου Δασικών Πυρκαγιών
Creators: name: Μάρκου, Σπυριδούλα Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Διαχείριση κρίσεων
Επικοινωνία
Φυσικές καταστροφές
Δασικές πυρκαγές
ΕΠαΔαΠ
Crisis management
Communication
Natural disasters
Forest fires
NOFFi

description: Κάθε χρόνο καταστρέφονται στην Ελλάδα χιλιάδες στρέμματα δασών εξαιτίας των πυρκαγιών. Η αποψίλωση δημόσιων και ιδιωτικών εκτάσεων μπορεί να οφείλεται σε ανθρωπογενείς ή φυσικούς παράγοντες. Αν και τα αίτια της δεύτερης κατηγορίας (πχ πρόκληση φωτιάς από κεραυνό) δεν μπορούν να προληφθούν σε μεγάλο βαθμό, εν τούτοις αυτά που άπτονται στην πρώτη κατηγορία μπορούν να προβλεφθούν και να αποσοβηθούν. Η ερευνητική μελέτη του τρόπου επικοινωνιακής διαχείρισης των πυρκαγιών και των καταστροφών που προκαλούνται ως επακόλουθο, καθίσταται σημαντική τα τελευταία χρόνια. Τη χαρτογράφηση των κατεστραμμένων από τις πυρκαγιές περιοχών στην Ελλάδα έχει αναλάβει το Εθνικό Παρατηρητήριο Δασικών Πυρκαγιών (ΕΠαΔαΠ). Το ΕΠαΔαΠ ιδρύθηκε από το Εργαστήριο Δασικής Διαχειριστικής και Τηλεπισκόπησης του Αριστοτελείου Πανεπιστημίου, σε συνεργασία με το υπουργείο Περιβάλλοντος. Το Παρατηρητήριο είναι υπεύθυνο για την ενημέρωση πληθώρας φορέων (δημοσίων και μη), ενώ έχει αναγνωριστεί σε εθνικό, πανευρωπαϊκό και παγκόσμιο επίπεδο. Η παρούσα εργασία θα επικεντρωθεί στην ανάλυση των παρεχόμενων από το ΕΠαΔαΠ πληροφοριών και τον τρόπο που τα δεδομένα αυτά αξιοποιούνται από τους δημοσιογράφους για την ενημέρωση του κοινού. Θα εξετασθεί η σημασία της επικοινωνίας τόσο πριν όσο και μετά την κρίση. Στόχος να αναδειχθούν ζητήματα του πως οι δημοσιογράφοι αξιοποιούν και αναδεικνύουν τη σχετική πληροφόρηση αλλά και το επικοινωνιακό πλάισιο μέσα στο οποίο εξελίσσονται οι κρίσεις.
description: Every year thousands of acres of forests are destroyed in Greece due to fires. Deforestation of public and private land can be caused by anthropogenic or natural factors. Although the causes of the second category (e.g. fire caused by lightning) cannot be largely prevented, those related to the first category can be predicted and prevented. The research study of how to communicate the management of fires and the disasters caused as a result, has become important in recent years. The mapping of areas destroyed by fires in Greece has been undertaken by the National Forest Fire Observatory (NOFFi). NOFFi was founded by the Laboratory of Forest Management and Remote Sensing of the Aristotle University, in collaboration with the Ministry of Environment. The Observatory is responsible for informing a variety of bodies (public and non-public) and has been recognized at national, pan-European and global level. This thesis will focus on the analysis of the information provided by the EPadap and the way these data are used by journalists to inform the public. The importance of communication both before and after the crisis will be addressed. The aim is to highlight issues of how journalists utilize and highlight relevant information and the communication context in which crises unfold.
Topological Defects and Gapless Modes in Insulators and Superconductors
Creators: name: Teo, Jeffrey C. Y.
name: Kane, C. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We develop a unified framework to classify topological defects in insulators and superconductors described by spatially modulated Bloch and Bogoliubov de Gennes Hamiltonians. We consider Hamiltonians H(k,r) that vary slowly with adiabatic parameters r surrounding the defect and belong to any of the ten symmetry classes defined by time reversal symmetry and particle-hole symmetry. The topological classes for such defects are identified, and explicit formulas for the topological invariants are presented. We introduce a generalization of the bulk-boundary correspondence that relates the topological classes to defect Hamiltonians to the presence of protected gapless modes at the defect. Many examples of line and point defects in three dimensional systems will be discussed. These can host one dimensional chiral Dirac fermions, helical Dirac fermions, chiral Majorana fermions and helical Majorana fermions, as well as zero dimensional chiral and Majorana zero modes. This approach can also be used to classify temporal pumping cycles, such as the Thouless charge pump, as well as a fermion parity pump, which is related to the Ising non-Abelian statistics of defects that support Majorana zero modes.
description: 27 pages, 15 figures, Published version
Constraints on Flows in Horava-Lifshitz Gravity by Classical Solutions
Creators: name: Kim, Taekyung
name: Kim, Yoonbai
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We find exact static stringy solutions of Horava-Lifshitz gravity with the projectability condition but imposing the detailed balance condition near the UV fixed point, and propose a method on constraining the possible pattern of flows in Horava-Lifshitz gravity by using the obtained classical solutions. In the obtained vacuum solutions, the parameters related to the speed of the graviton and the coefficients of quartic spatial derivative terms lead to intriguing effects: the change of graviton speed yields a surplus angle and the quartic derivatives make the square of effective electric charge negative. The result of a few tests based on the geometries of a cone, an excess cone, a black string, and a charged (black) string seems suggestive. For example, the flow of constant graviton speed and variable Newton's coupling can be favored in the vicinity of IR fixed point, but the conclusion is indistinct and far from definite yet. Together with the numerous classical solutions, static or time-dependent, which have already been found, the accumulated data from various future tests will give some hints in constraining the flow patterns more deterministic.
description: 27 pages, 3 figures, version to appear in PRD
Κβαντική Διανομή Κλειδιού: Βασικά Πρωτόκολλα και Επιθέσεις
Creators: name: Μηλούση, Κωνσταντίνα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Κβαντική διανομή κλειδιού
Κρυπτογραφία
Πρωτόκολλο
Quantum key distribution
Cryptography
Protocol

description: Στόχος της εργασίας είναι η μελέτη και περιγραφή κάποιων από τα γνωστότερα συστήματα κβαντικής διανομής κλειδιού, όπως το πρωτόκολλο των Charles Bennett και Gilles Brassard, ΒΒ84, το μεταγενέστερο πρωτόκολλο του Charles Bennett, B92, και τέλος το πρωτόκολλο του Artur Ekert, E91, το οποίο αποτελεί το πρώτο πρωτόκολλο που βασίζεται στο φαινόμενο της κβαντικής διεμπλοκής για την μετάδοση της πληροφορίας. Στο πρώτο κεφάλαιο της εργασίας περιγράφεται η διαδικασία λειτουργίας ενός συστήματος κβαντικής διανομής κλειδιού. Στο δεύτερο κεφάλαιο ακολουθεί η περιγραφή της λειτουργίας του πρωτοκόλλου BB84, μελετώνται κάποιες από τις κυριότερες μορφές επιθέσεων στο πρωτόκολλο αυτό και τέλος αποδεικνύεται η ασφάλεια του πρωτοκόλλου. Στην συνέχεια, με ανάλογο τρόπο, στο τρίτο κεφάλαιο αναπτύσσεται η περιγραφή του πρωτοκόλλου B92, αναλύονται οι επιθέσεις στο πρωτόκολλο αυτό και τελικά αποδεικνύεται η ασφάλειά του. Το τέταρτο κεφάλαιο αφορά, ακριβώς ανάλογα, την περιγραφή του πρωτοκόλλου E91, τις επιθέσεις που διεξάγονται σε ένα πρωτόκολλο βασιζόμενο στο φαινόμενο της κβαντικής διεμπλοκής όπως το E91 και τέλος αποδεικνύεται και πάλι η ασφάλεια του πρωτοκόλλου. Το πέμπτο και τελευταίο κεφάλαιο της εργασίας εστιάζει στην σύγχρονη κατάσταση της κβαντικής διανομής κλειδιού και στις προκλήσεις που αυτή αντιμετωπίζει ακόμα και σήμερα.
description: The aim of the thesis is the study and description of some of the best-known quantum key distribution systems, such as the protocol of Charles Bennett and Gilles Brassard, BB84, the later protocol of Charles Bennett, B92, and finally the protocol of Artur Ekert, E91, which is the first protocol based on the phenomenon of quantum entanglement for the transmission of information. In the first chapter of the thesis, the operation process of a quantum key distribution system is described.. In the second chapter follows the description of the operation of the BB84 protocol, some of the main forms of attacks in this protocol are studied and finally the security of the protocol is demonstrated. Then, in a similar way, the third chapter develops the description of the B92 protocol, attacks on this protocol are analysed and finally its security is proven. The fourth chapter deals, exactly accordingly, with the description of the E91 protocol, the attacks carried out on a protocol based on the quantum entanglement phenomenon such as E91 and finally the security of the protocol is proven once again. The fifth and final chapter of the thesis focuses on the current state of quantum key distribution and the challenges it still faces today.
Toric CFTs, Permutation Triples, and Belyi Pairs
Creators: name: Jejjala, Vishnu
name: Ramgoolam, Sanjaye
name: Rodriguez-Gomez, Diego
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Four-dimensional CFTs dual to branes transverse to toric Calabi-Yau threefolds have been described by bipartite graphs on a torus (dimer models). We use the theory of dessins d'enfants to describe these in terms of triples of permutations which multiply to one. These permutations yield an elegant description of zig-zag paths, which have appeared in characterizing the toroidal dimers that lead to consistent SCFTs. The dessins are also related to Belyi pairs, consisting of a curve equipped with a map to P^1, branched over three points on the P^1. We construct explicit examples of Belyi pairs associated to some CFTs, including C^3 and the conifold. Permutation symmetries of the superpotential are related to the geometry of the Belyi pair. The Artin braid group action and a variation thereof play an interesting role. We make a conjecture relating the complex structure of the Belyi curve to R-charges in the conformal field theory.
description: 64 pages, 16 figures, LaTeX; version 2: minor typo corrections, slight editing of text; version 3: minor typo corrections, version published in JHEP
Effects of edge magnetism and external electric field on energy gaps in multilayer graphene nanoribbons
Creators: name: Sahu, Bhagawan
name: Min, Hongki
name: Banerjee, Sanjay K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using first-principles density-functional theory, we study the electronic structure of multilayer graphene nanoribbons as a function of the ribbon width and the external electric field, applied perpendicular to the ribbon layers. We consider two types of edges (armchair and zigzag), each with two edge alignments (referred to as alpha- and beta-alignments). We show that, as in monolayer and bilayer armchair nanoribbons, multilayer armchair nanoribbons exhibit three classes of energy gaps which decrease with increasing width. Nonmagnetic multilayer zigzag nanoribbons have band structures that are sensitive to the edge alignments and the number of layers, indicating different magnetic properties and resulting energy gaps. We find that energy gaps can be induced in ABC-stacked ribbons with a perpendicular external electric field while in other stacking sequences, the gaps decrease or remain closed as the external electric field increases.
description: 7 pages, 9 figures, text revised, last version before publication
Unparticle contributions to $\Bs$-$\Bsbar$ mixing
Creators: name: Lee, Jong-Phil
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The unparticle effects on the $\Bs$-$\Bsbar$ mixing is revisited. Taking into account the unitarity constraints on the unparticle operators, we find that the contribution of the vector unparticle is very suppressed compared to that of the scalar unparticle. This is due to the fact that the lower bound of the scaling dimension of the vector-unparticle operator is larger. It is also shown that the mixing phase from the scalar unparticle is negative, and unparticles can produce large mixing phase.
description: 9 pages, 2 figures. More discussions, references updated. To appear in PRD
Charged Particle Tracking with the Timepix ASIC
Creators: name: Akiba, Kazuyoshi
name: Artuso, Marina
name: Badman, Ryan
name: Borgia, Alessandra
name: Bates, Richard
name: Bayer, Florian
name: van Beuzekom, Martin
name: Buytaert, Jan
name: Cabruja, Enric
name: Campbell, Michael
name: Collins, Paula
name: Crossley, Michael
name: Dumps, Raphael
name: Eklund, Lars
name: Esperante, Daniel
name: Fleta, Celeste
name: Gallas, Abraham
name: Gandelman, Miriam
name: Garofoli, Justin
name: Gersabeck, Marco
name: Gligorov, Vladimir V.
name: Gordon, Hamish
name: Heijne, Erik H. M.
name: Heijne, Veerle
name: Hynds, Daniel
name: John, Malcolm
name: Leflat, Alexander
name: Llin, Lourdes Ferre
name: Llopart, Xavi
name: Lozano, Manuel
name: Maneuski, Dima
name: Michel, Thilo
name: Nicol, Michelle
name: Needham, Matt
name: Parkes, Chris
name: Pellegrini, Giulio
name: Plackett, Richard
name: Poikela, Tuomas
name: Rodrigues, Eduardo
name: Stewart, Graeme
name: Wang, Jianchun
name: Xing, Zhou
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A prototype particle tracking telescope has been constructed using Timepix and Medipix ASIC hybrid pixel assemblies as the six sensing planes. Each telescope plane consisted of one 1.4 cm2 assembly, providing a 256x256 array of 55 micron square pixels. The telescope achieved a pointing resolution of 2.3 micron at the position of the device under test. During a beam test in 2009 the telescope was used to evaluate in detail the performance of two Timepix hybrid pixel assemblies; a standard planar 300 micron thick sensor, and 285 micron thick double sided 3D sensor. This paper describes a detailed charge calibration study of the pixel devices, which allows the true charge to be extracted, and reports on measurements of the charge collection characteristics and Landau distributions. The planar sensor achieved a best resolution of 4.0 micron for angled tracks, and resolutions of between 4.4 and 11 micron for perpendicular tracks, depending on the applied bias voltage. The double sided 3D sensor, which has significantly less charge sharing, was found to have an optimal resolution of 9.0 micron for angled tracks, and a resolution of 16.0 micron for perpendicular tracks. Based on these studies it is concluded that the Timepix ASIC shows an excellent performance when used as a device for charged particle tracking.
description: 51 pages, 39 figures. Submitted to Nucl. Phys. Meth. A. ; Contact authors: P. Collins and V. V. Gligorov
Typification d'Ophrys exaltata Tenore (Orchidaceae)
Creators: name: Romieg Soca
Publisher: name: Zenodo
Year: 2002
Subjects: Ophrys

description: Soca R., 2002. Typification d'Ophrys exaltata Tenore (Orchidaceae). Monde des Plantes 97(475): 25-29.