cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Particulate organic matter in artificial soils
Creators: name: Levers, Oliver
Publisher: name: Imperial College London
Year: 2019

description: It is estimated that around 2 ×109 hectares of land (15% of global land area) has been degraded by human activity, and rates of soil degradation are increasing. Soil is a precious resource, it sustains almost all terrestrial life and provides 90% of the food that feeds humanity. New methods are needed to improve degraded soils and recover desertified soils, particularly in higher risk areas such as deforested areas in the tropics. Waste products of industrial bio-refining may provide a convenient and abundant material for use as a soil amendment, with the added benefit of increasing the carbon sequestration potential of bio-based products. Unfortunately, knowledge of how soils can be restored in a targeted manner are missing. This thesis aims to determine the key inter-particulate interactions which promote the formation of stable aggregates, with a focus on bio-refinery products as soil amendments. New methodologies are established in order to explore particulate interactions in the context of soils, and tested on artificial soils and aggregates with defined compositions. Abiotic artificial soils are studied, to identify the physical and chemical aggregate forming processes separately of biological processes. Particulate - clay interactions are found to be complex, and the mechanical properties of the aggregate are found not only to be dependent on surface chemistry but also on the fabric morphology, pore space and particle shape. Organosolv lignin, a biorefinery waste product, was shown to bind to the silica face of kaolinite, driven by hydrophobic interactions in suspension, and were found to strengthen kaolinite aggregates up to a percolation threshold. Video image analysis is used to determine slaking kinetics of aggregates submerged in a flow cell. The role of these interactions for soil development is also investigated, in order to determine if aggregates form by accumulating stable organo-mineral interactions over repeated wet/dry cycles. The nature of lignin-kaolinite interactions are investigated using solid-state magic angle spinning NMR and T1 relaxation NMR. Finally, a soil microcosm experiment was carried out, in order to determine the microbial response to the addition of lignin, which present a challenging substrate for ecosystems of degraded soils. These experiments illustrate the importance of particulate interactions for forming stable soil aggregates and soil structure, and the results provide insights into how particulates may be engineered to improve soils with a targeted approach.
Unconventional Superconducting Symmetry in a Checkerboard Antiferromagnet
Creators: name: Huang, Huai-Xiang
name: Li, You-Quan
name: Gan, Jing-Yu
name: Chen, Yan
name: Zhang, Fu-Chun
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use a renormalized mean field theory to study the Gutzwiller projected BCS states of the extended Hubbard model in the large $U$ limit, or the $t$-$t'$-$J$-$J'$ model on a two-dimensional checkerboard lattice. At small $t'/t$, the frustration due to the diagonal terms of $t'$ and $J'$ does not alter the $d_{x^2-y^2}$-wave pairing symmetry, and the negative (positive) $t'/t$ enhances (suppresses) the pairing order parameter. At large $t'/t$, the ground state has an extended s-wave symmetry. At the intermediate $t'/t$, the ground state is $d+id$ or $d+is$-wave with time reversal symmetry broken.
description: 6 pages, 6 figures
Ανάπτυξη ενισχυτικού υλικού για την εκμάθηση της Γαλλικής γλώσσας στην Πρωτοβάθμια εκπαίδευση, μέσω ασύγχρονης τηλεκπαίδευσης:
Creators: name: Θάνου, Ζωή Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Γαλλική Γλώσσα
Πρωτοβάθμια Εκπαίδευση
Πλατφόρμα Moodle
French language
Primary education
Moodle platform

description: Το θέμα της παρούσας εργασίας είναι η διδασκαλία και η εκμάθηση της γαλλικής γλώσσας στην Πρωτοβάθμια εκπαίδευση, συγκεκριμένα στην ΣΤ΄ τάξη Δημοτικού, μέσα από την ανάπτυξη μαθημάτων στην πλατφόρμα Moodle. Σκοπός της διατριβής ήταν είναι να συνδράμει στην καλύτερη κατανόηση των ωφελειών της ασύγχρονης τηλεκπαίδευσης, ενώ με τη δημιουργία των μαθημάτων στο Moodle, να παρέχει ιδέες για μια καλύτερη προοπτική στην εκμάθηση της ξένης γλώσσας. Εξετάσαμε τις γνωστικές θεωρίες μάθησης, τις θεωρίες σχετικά με τη διδασκαλία ξένης γλώσσας σε κοινό Πρωτοβάθμιας εκπαίδευσης, τις κοινωνικο-πολιτιστικές θεωρίες μάθησης, τον κοινωνικό εποικοδομισμό και την υδριβική μάθηση (blended learning). Στη συνέχεια παρουσιάσαμε αναλυτικά τις διάφορες κατηγορίες συστημάτων Ασύγχρονης Τηλεκπαίδευσης και περιγράφονται οι δυνατότητες τους. Επίσης, παρουσιάζεται αναλυτικά το Moodle, καθώς είναι το σύστημα στο οποίο αναπτύχθηκε το ενισχυτικό υλικό της εργασίας. Στο πρακτικό μέρος της παρούσας μελέτης, γίνεται η παρουσίαση του ενισχυτικού υλικού και παρουσιάζεται η ανάπτυξη μαθημάτων στην πλατφόρμα. Η θεματολογία των μαθημάτων αντιστοιχεί στο δεύτερο επίπεδο γλωσσομάθειας (Α2), όπως αυτό ορίζεται από το Κοινό Ευρωπαϊκό Πλαίσιο Αναφοράς για τις Γλώσσες (ΚΕΠΑ). Τέλος, καταγράφονται τα γενικά συμπεράσματα που πρόεκυψαν από την έρευνα.
description: The subject of this thesis is the teaching and learning of the French language in primary education, particularly in the sixth grade of primary school, through the development of courses on Moodle platform. The aim was to contribute to a better understanding of the benefits of asynchronous learning while the creation of courses on Moodle provide ideas for a better perspective on the learning of a foreign language. We examined the cognitive learning theories, theories on language teaching in primary education subjects, socio - cultural theories of learning, social constructivism and blended learning. In addition we presented in detail the various categories of asynchronous learning and described their potential. Next, Moodle platform is presented in detail, as it is the system in which the reinforcing material was developed. In the practical part of this thesis, we present the reinforcing material and the course development on the platform. The topics of the course correspond to the second level of proficiency (A2), as defined by the Common European Framework of Reference for Languages (CEFR). Finally, the general conclusions from the research are drawn.
Percolation on dual lattices with k-fold symmetry
Creators: name: Bollobas, Bela
name: Riordan, Oliver
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 60K35; 82B43

description: Zhang found a simple, elegant argument deducing the non-existence of an infinite open cluster in certain lattice percolation models (for example, p=1/2 bond percolation on the square lattice) from general results on the uniqueness of an infinite open cluster when it exists; this argument requires some symmetry. Here we show that a simple modification of Zhang's argument requires only 2-fold (or 3-fold) symmetry, proving that the critical probabilities for percolation on dual planar lattices with such symmetry sum to 1. Like Zhang's argument, our extension applies in many contexts; in particular, it enables us to answer a question of Grimmett concerning the anisotropic random cluster model on the triangular lattice.
description: 11 pages, 1 figure. Revised with applications added; to appear in Random Structures and Algorithms
The role of the DSB system in antimicrobial resistance
Creators: name: Kaderabkova, Nikol
Publisher: name: Imperial College London
Year: 2020

description: Extensive use of antibiotics in medicine and agriculture has led to increasing emergence of antimicrobial resistance in bacterial populations. Dwindling resources in the discovery of novel active compound leads and the increasing demands for safety and efficacy of new drugs mean that we are now faced with treatment failures due to multi-drug resistant pathogens. In the quest for new targets that will enable us to counter antibiotic resistance, it is often ignored that many resistance mechanisms precede the clinical use of antibiotics. Instead, the ability to adapt, survive and bypass the toxicity of many chemical compounds is wired within the bacterial genome. Continuous inter-strain and inter-species competition have given microorganisms tools to thrive under conditions of chemical warfare. Recognising this is important when characterising mechanisms underpinning bacterial antimicrobial resistance, as it can lead to novel strategies that can help us bypass it. The work described here explores the connection between the disulfide bond formation system, a key oxidative protein folding pathway in the cell envelope of Gram-negative bacteria, and two widespread antimicrobial resistance mechanisms, b-lactamase catalysed hydrolysis of b-lactam antibiotics and efflux-mediated drug expulsion. It is demonstrated that oxidative-protein-folding-mediated proteostasis is crucial for both resistance mechanisms, and its inhibition can sensitise multidrug-resistant pathogens to existing antibiotics. Preliminary results from an experimental evolution approach, set the scene for future exploration of the importance of disulfide linkages for the capacity of b-lactamase enzymes to evolve under selective pressure. Together, these findings aim to address the mechanistic basis of a new avenue for antibiotic adjuvant therapy, whereby targeting a non-essential process would allow us to potentiate existing antibiotics towards previously resistant bacterial strains. With novel essential targets against bacteria being scarce, adjuvant approaches like this one could prolong the use and efficacy of existing drugs against some of the most resistant Gram-negative pathogens.
Hydrologic modelling with variable fluid properties : a liquid sulfur aquifer beneath the surface of Io
Creators: name: Wijns, Christopher P.
Publisher: name: University of British Columbia
Year: 2009

description: The return of the first Voyager images of Io in 1979 provoked a controversy over the importance of sulfur versus silicate volcanism in resurfacing the satellite. The debate involves both the strength of crustal material as well as the mode of mass and heat transport to the surface of Io. The dynamics of sulfur magma transport will depend upon the properties of liquid sulfur. Unlike the Newtonian behaviour of silicate magmas, molten sulfur has anomalies in the heat capacity (a A-like transistion at 432 K) and in the viscosity (a maximum at 460 K) due to a polymerization reaction. Numerical modelling of a pure liquid sulfur supply region at depth in a porous crust shows that the fluid supply rate from such a magma reservoir is about seven orders of magnitude less than the observed mass and heat fluxes at the surface of Io. This requires accumulation of magma in a reservoir prior to eruption at the surface, but the accumulation time on the order of tens of thousands of years is much longer than would be consistent with the level of volcanic activity observed on Io. Low sulfur magma supply rates suggest that sulfur is not the dominant resurfacing material for the satellite. This is consistent with calculations performed for the viscous relaxation of topography on Io. Surface features of a largely sulfur crust would disappear within months because of material weakness. Significant topographic highs and steep slopes on Io provide evidence for a crust with stronger mechanical properties. Sulfur convection in the crust can still provide a large fraction of the global heat flow, within certain conditions on the permeability. Previous estimates of resurfacing rates have equated the cooling of erupted material to the entire global energy budget. Significant convective transfer of heat by liquid sulfur may call for a downward revision of resurfacing rates.
Cerenkov radiation from moving straight strings
Creators: name: Gal'tsov, D. V.
name: Melkumova, E. Yu.
name: Salehi, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study Cerenkov radiation from moving straight strings which glisse with respect to each other in such a way that the projected intersection point moves faster than light. To calculate this effect we develop classical perturbation theory for the system of Nambu-Goto strings interacting with dilaton, two-form and gravity. In the first order one encounters divergent self-action terms which are eliminated by classical renormalization of the string tension. Cerenkov radiation arises in the second order. It is generated by an effective source which contains contributions localized on the strings world-sheets and bulk contributions quadratic in the first order fields. In the ultra-relativistic limit radiation exhibits angular peaking on the Cerenkov cone in the forward direction of the fast string in the rest frame of another. The radiation spectrum then extends up to high frequencies proportional to square of the Lorentz-factor of the relative velocity. Gravitational radiation is absent since the 1+2 space-time transverse to the straight string does not allow for gravitons. A rough estimate of the Cerenkov radiation in the cosmological cosmic strings network is presented.
description: 30 pages, 12 figures
Η σκοτεινή πλευρά της ηγεσίας. Ο Μακιαβελιστής ηγέτης.:
Creators: name: Κρουκλίδου, Θεοδώρα Σάββα
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ηγεσία
Σκοτεινή
Μακιαβέλλι
Leadership
Dark
Machiavelli

description: Σκοπός της διατριβής ήταν η μελέτη της σκοτεινής πλευράς της ηγεσίας και συγκεκριμένα η μελέτη του Μακιαβελιστή ηγέτη. Εξετάσαμε τον όρο «σκοτεινή πλευρά» της ηγεσίας και τις επιπτώσεις αυτής στην επαγγελματική ζωή αλλά και στην ίδια την κοινωνία. Στη συνέχεια παρουσιάσαμε αναλυτικά τα χαρακτηριστικά του Μακιαβελιστή ηγέτη, δηλαδή αυτού του ηγέτη ο οποίος ενστερνίζεται και πράττει σύμφωνα με τις αρχές που δίδαξε ο Μακιαβέλλι τα χρόνια του Μεσαίωνα. Στην συνέχεια συνδέσαμε τον Μακιαβελισμό με διάφορα οργανωσιακά κριτήρια, όπως είναι οι τακτικές επιρροής, η επαγγελματική ικανοποίηση κτλ. Ακόμη αναφερθήκαμε αναλυτικά μέσα από εμπειρική έρευνα στις επιπτώσεις του Μακιαβελισμού σε έναν οργανισμό. Επιπλέον μέσα από την έρευνά μας δείξαμε ότι ο Μακιαβελισμός μέσα σε έναν οργανισμό συνδέεται άμεσα με τον οργανωσιακό κυνισμό και την συναισθηματική εξάντληση των εργαζομένων. Μεγάλα ποσοστά Μακιαβελιστικών συμπεριφορών αυξάνουν εκθετικά το αίσθημα του οργανωσιακού κυνισμού καθώς και την συναισθηματική εξάντληση των εργαζομένων.
description: The aim of the present thesis was the study of the dark side of leadership and specifically the Machiavellian leader. We examined the term “dark side” of leadership and its consequences in professional life and αmid all the society. Then we presented in detail the features of Machiavellian leader, this leader who espouses and acts in accordance with the principles that Machiavelli taught in the Middle Ages. Then we connected the Machiavellianism with several of organizational criteria, such as influence, job satisfaction etc. Also we elaborated through empirical research on the effects of Machiavellianism in an organization. Furthermore through our research we showed that Machiavellianism is directly related to organizational cynicism and the emotional exhaustion of employees. Machiavellianism behaviors exponentially increase the organizational cynicism and the emotional exhaustion of employees.
Self-Organized Formation of Fractal and Regular Pores in Semiconductors
Creators: name: Claussen, Jens Christian
name: Carstensen, Jürgen
name: Christophersen, Marc
name: Langa, Sergiu
name: Föll, Helmut
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Electrochemical etching of semiconductors, beside technical applications, provides an interesting experimental setup for self-organized structure formation capable of regular, diameter-modulated, and branching pores. The underlying dynamical processes governing current transfer and structure formation are described by the Current-Burst-Model: all dissolution processes are assumed to occur inhomogeneously in time and space as a Current Burst (CB); properties and interactions between CB's are described by a number of material- and chemistry- dependent ingredients, like passivation and aging of surfaces in different crystallographic orientations, giving a qualitative understanding of resulting pore morphologies.
description: 6 pages, 10 figures (reduced resolution)
Ανάπτυξη εφαρμογής έξυπνων συσκευών λειτουργικού συστήματος Android για την αγορά ηλεκτρονικού εισιτηρίου αστικών λεωφορείων του Οργανισμού Αστικών Συγκοινωνιών Θεσσαλονίκης (ΟΑΣΘ).:
Creators: name: Παπάζογλου, Ευαγγελία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Κινητό εμπόριο
Ηλεκτρονικό εισιτήριο
Έξυπνες συσκευές
Mobile Commerce
Electronic Ticket
Smart devices

description: Στο πλαίσιο της παρούσας διπλωματικής εργασίας αναπτύχθηκε μια εφαρμογή κινητού εμπορίου για έξυπνα κινητά με λειτουργικό Android. Το αντικείμενο που εμπορεύεται η συγκεκριμένη εφαρμογή είναι εισιτήρια για τα αστικά λεωφορεία του Οργανισμού Αστικών Συγκοινωνιών Θεσσαλονίκης (ΟΑΣΘ). Αρχικά, η εφαρμογή απαιτεί από το χρήστη να δημιουργήσει το δικό του λογαριασμό (Registration) και στην συνέχεια να εισέλθει στο κυρίως κομμάτι της εφαρμογής (Login), το οποίο περιλαμβάνει και την αγορά των εισιτηρίων. Η εφαρμογή αλληλεπιδρά με έναν εξυπηρετητή (server), μια βάση δεδομένων (MySQL) και με ένα σύστημα πληρωμών ηλεκτρονικού και κινητού εμπορίου (PayPal). Μέσω της επικοινωνίας και της αλληλεπίδρασης των προαναφερθέντων εργαλείων και συστημάτων επιτυγχάνεται η αγορά ενός ηλεκτρονικού εισιτηρίου. Ο χρήστης έχει την δυνατότητα να διαγράψει τα εισιτήρια που δεν του είναι χρήσιμα πλέον και να επικυρώσει για δεύτερη φορά τα εισιτήρια δυο διαδρομών. Στόχος της εφαρμογής είναι να διευκολύνει τους επιβάτες των αστικών λεωφορείων της Θεσσαλονίκης, παρέχοντας τους δυνατότητες γρήγορης και εύκολης αγοράς ηλεκτρονικών εισιτηρίων.
description: The main purpose of this diploma thesis is the implementation of a mobile commerce application for smartphones with Android operating system. The item that this application commercializes is tickets for the city buses of Thessaloniki. Initially, the application requires from the user to create an account (Registration) and then to log in to the main part of the application (Login), which includes the purchase of tickets. The application interacts with a server, a database (MySQL) and a system of electronic and mobile payments (PayPal). Through the communication and the interaction of these tools and systems, an electronic ticket can be purchased. The user has the option to delete the tickets, that they are no longer useful, and to validate for second time the tickets of two routes. The aim of the application is to facilitate the passengers of the city buses of Thessaloniki, providing capabilities for a quick and easy purchase of an electronic ticket.
Non-thermal Production of Dark Matter from Late-Decaying Scalar Field at Intermediate Scale
Creators: name: Endo, Motoi
name: Takahashi, Fuminobu
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine non-thermal dark matter production from a late-decaying scalar field, with a particular attention on non-renormalizable operators of D=5 through which the scalar field decays into the standard model particles and their superpartners. We show that almost the same number of superparticles as that of particles are generally produced from the decay. To avoid the gravitino overproduction problem, the decay is favored to proceed via interactions with an intermediate cut-off scale M << M_P. This should be contrasted to the conventional scenario using the modulus decay. The bosonic supersymmetry partner of the axion, i.e., saxion, is proposed as a natural candidate for such late-decaying scalar fields. We find that a right amount of the wino/higgsino dark matter with a mass of O(100) GeV is obtained for the saxion mass around the weak scale and axion decay constant, F_A = O(10^{9-12}) GeV.
description: 22 pages, 1 figure; minor changes
Boundary one-point function, Casimir energy and boundary state formalism in D+1 dimensional QFT
Creators: name: Bajnok, Z.
name: Palla, L.
name: Takacs, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider quantum field theories with boundary on a codimension one hyperplane. Using 1+1 dimensional examples, we clarify the relation between three parameters characterising one-point functions, finite size corrections to the ground state energy and the singularity structure of scattering amplitudes, respectively. We then develop the formalism of boundary states in general D+1 spacetime dimensions and relate the cluster expansion of the boundary state to the correlation functions using reduction formulae. This allows us to derive the cluster expansion in terms of the boundary scattering amplitudes, and to give a derivation of the conjectured relations between the parameters in 1+1 dimensions, and their generalization to D+1 dimensions. We use these results to express the large volume asymptotics of the Casimir effect in terms of the one-point functions or alternatively the singularity structure of the one-particle reflection factor, and for the case of vanishing one-particle couplings we give a complete proof of our previous result for the leading behaviour.
description: 32 pages, 1 eps figures
title: Geschraubte, gleitfest vorgespannte Verbindungen an feuerverzinkten Brückenbauteilen unter zyklischen Beanspruchungen
Creators: name: Kraemer, A.‐K.
name: Klein, M.
name: Oechsner, M.
name: Grote, J.
name: Ungermann, D.
Publisher: name: Wiley-VCH
Year: 2024

description: Feuerverzinkte Stahlbauten haben sich im Hochbau etabliert und gehören zum Stand der Technik. Sie erreichen Korrosionsschutzdauern in der Größenordnung der Lebensdauer des Bauwerks (≥100 Jahre). Die Anwendung dieses Korrosionsschutzsystems hätte auch im Brückenbau ein großes Potenzial. Wirtschaftlichkeit und Nachhaltigkeit im Brückenbau sind neben den Neubaukosten insbesondere von den während der Lebensdauer anfallenden Unterhaltungskosten bestimmt. Ein erfolgreich abgeschlossenes Forschungsvorhaben zeigt, dass die Feuerverzinkung als Korrosionsschutz grundlegend und vorteilhaft einsetzbar ist. Die Ermüdungsfestigkeit feuerverzinkter Bauteile hat nur geringe Einbußen gegenüber nicht verzinkten Stahlbauteile zu vermerken. Große Brückenkonstruktionen müssen mit Montagestößen ausgeführt werden. Geschweißte, feuerverzinkte Bauteile ziehen eine aufwändige Vor‐ und Nachbearbeitung des Korrosionsschutzes mit sich. Der nachträglich aufgebrachte Korrosionsschutz erreicht bei weitem nicht die Schutzdauer einer Feuerverzinkung. Diese technologische Einschränkung kann vermieden werden, wenn die Ausführung der Montagestöße durch feuerverzinkte, geschraubte Anschlüsse erfolgt. Im Stahlbrückenbau hat sich der Einsatz von gleitfest vorgespannten (GV) Verbindungen bewährt. Für eine Anwendung von gleitfest vorgespannten Verbindungen bei feuerverzinkten Montagestößen fehlten bislang wesentliche wissenschaftliche Untersuchungen. Technische und wissenschaftliche Grundlagen zum Einsatz von feuerverzinkten Schraubanschlüssen im zyklisch beanspruchten Stahl‐ und Verbundbrückenbau auf Basis des Eurocode 3 wurden erarbeitet und Berechnungsnachweise sowie Konstruktionsempfehlungen bereitgestellt.
Giants On Deformed Backgrounds
Creators: name: Pirrone, Marco
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study giant graviton probes in the framework of the three--parameter deformation of the AdS_5 x S^5 background. We examine both the case when the brane expands in the deformed part of the geometry and the case when it blows up into AdS. Performing a detailed analysis of small fluctuations around the giants, the configurations turn out to be stable. Our results hold even for the supersymmetric Lunin-Maldacena deformation.
description: LaTex, 28 pages, uses JHEP3; v2: minor corrections, references added; v3: final version accepted for publication in JHEP
Αξιοποίηση των τεχνολογιών του Σημασιολογικού Ιστού για τη Σχεδίαση και Υλοποίηση της τοποκεντρικής εφαρμογής κινητών συσκευών υποστήριξης της ανακύκλωσης, "Θησαυροί στην πόλη":
Creators: name: Βικτωράτος, Βασίλειος Σπυρίδωνος
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Εφαρμογή για έξυπνες κινητές συσκευές
Σημασιολογικός Ιστός
Τοποκεντρική εφαρμογή
Mobile application
Semantic Web
Location - based services (LBS)

description: Στο πλαίσιο της παρούσας εργασίας σχεδιάστηκε και αναπτύχθηκε μια πρότυπη τοποκεντρική εφαρμογή με τίτλο "Θησαυροί στην πόλη" που αξιοποιεί τις τεχνολογίες του σημασιολογικού ιστού και εκτελείται σε κινητές συσκευές με το λειτουργικό σύστημα Android 2.1 και πάνω. Αρχικά, παρουσιάζονται οι κινητές συσκευές και τα διάφορα λειτουργικά συστήματα που υπάρχουν. Έπειτα, αναλύεται ο όρος κινητή εφαρμογή και τα είδη που την αποτελούν. Τέλος, γίνεται αναφορά στις τοποκεντρικές εφαρμογές αλλά και στο Σημασιολογικό Ιστό και πως μπορούν αυτές οι δύο τεχνολογίες να συσχετιστούν. Στη συνέχεια, γίνεται μια ανάλυση σκοπιμότητας της εφαρμογής. Αναφέρεται το πρόβλημα που καλείται η εφαρμογή να λύσει, οι παραπλήσιες εφαρμογές που υπάρχουν στο χώρο και πώς σχεδιάστηκε και με ποία εργαλεία και τεχνικές υλοποιήθηκε η παρούσα εφαρμογή. Κλείνοντας, παρουσιάζεται η λειτουργικότητα της εφαρμογής με την αναφορά σεναρίων χρήσης.
description: The main goal of this thesis is the design and implementation of a location - based application entitled "City's Treasures", which uses the technologies of semantic web and running on smart mobile devices with the android OS 2.1 and above. Initially, there is an introduction to the variety of mobile devices and the different operating systems available. Then, we the term mobile application and the different types that compose it, is discussed. Finally, reference is made to Location - based services and Semantic Web and how these two technologies can be related. Moreover, a feasibility analysis of the application is made and indicated the problem which, application tries to solve. Then, we display the similar applications existed and what tools and techniques are used for the implementation of the application. Concluding, the application's functionality is presented by reference different use case scenarios.
title: The American Samoa Longline Limited-entry Fishery Quarterly Report 1 January–31 March 2023
Creators: name: Pacific Islands Fisheries Science Center (U.S.). Fisheries Research and Monitoring Division
Publisher: name: NOAA National Marine Fisheries Service Pacific Islands Fisheries Science Center
publisherIdentifier: https://ror.org/02apffz65
publisherIdentifierScheme: ROR
Year: 2024

description: PIFSC data report ; DR-24-20
description: Effort and catch statistics for the American Samoa longline limited-entry fishery reported by fishers on electronic and paper logs are summarized for the first quarter of 2023 (1 January–31 March; PIFSC, 2024).
Magnification Laws of Winner-Relaxing and Winner-Enhancing Kohonen Feature Maps
Creators: name: Claussen, Jens Christian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Self-Organizing Maps are models for unsupervised representation formation of cortical receptor fields by stimuli-driven self-organization in laterally coupled winner-take-all feedforward structures. This paper discusses modifications of the original Kohonen model that were motivated by a potential function, in their ability to set up a neural mapping of maximal mutual information. Enhancing the winner update, instead of relaxing it, results in an algorithm that generates an infomax map corresponding to magnification exponent of one. Despite there may be more than one algorithm showing the same magnification exponent, the magnification law is an experimentally accessible quantity and therefore suitable for quantitative description of neural optimization principles.
description: 6 pages, 3 figures. ESMTB 2002 Milano. For the extended journal version see cond-mat/0208414
Finite Size Giant Magnon
Creators: name: Ramadanovic, Bojan
name: Semenoff, Gordon W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The quantization of the giant magnon away from the infinite size limit is discussed. We argue that this quantization inevitably leads to string theory on a Z_M-orbifold of S^5. This is shown explicitly and examined in detail in the near plane-wave limit.
The spatial filtering from core-scale conductivity to the conductivity measured by a slug test
Creators: name: Wang, Bin
Publisher: name: University of British Columbia
Year: 2009

description: In the thesis, I investigate the measurement process of the slug test, an important and efficient engineering technique employed to probe aquifer properties. The objective is to determine the scale at which a slug test 'measures' hydraulic conductivity. To determine the scale, I conceptualize slug test measurement process in a system and filtering framework. I quantify, through numeric experiments, the spatial filtering effect of the slug test upon the core-scale hydraulic conductivity field. I examine the role of specific storage on this filtering effect. I develop two approaches to identify the system filter that epitomizes the filtering system — measurement process: spectral analysis with Wiener filtering and numerical perturbation. In heterogeneous media, system linearity is analyzed and the inverse estimation of the system output is evaluated. With the spectral approach, I optimally estimate the system filter in the presence of measurement noise. In homogeneous media where the spectral approach cannot be used, I apply the numerical perturbation approach. The spectral analysis and numerical perturbation are two conceptually different but complementary approaches. I analyze the nonparametric form of the system filter in heterogeneous media of various spatial variability and specific storage values. I determine the empirical parametric expression of equivalent filter width versus specific storage in homogeneous media. It is found that: 1. In both heterogeneous and homogeneous media, the equivalent filter width increases linearly with respect to log [mathematical formula which cannot be reproduced here; see pdf] 2. In homogeneous media, the filter amplitude decreases away from the wellbore by an approximate [mathematical formula which cannot be reproduced here; see pdf]. 3. A preliminary analysis of the role of heterogeneity characteristics upon the slugtest filtering was undertaken. The slug-test filtering was not strongly influenced by heterogeneity characteristics for log-conductivity variances less than 0.7. At variances less than 0.3, anisotropy in the conductivity field caused anisotropy in the slug-test filtering. These effects were not quantified in this thesis. In the end, I discuss the possible engineering and theoretical applications of the spatial filtering approach and make recommendations for future work.
Electron mobility on a surface of dielectric media: influence of surface level atoms
Creators: name: Grigoriev, P. D.
name: Dyugaev, A. M.
name: Lebedeva, E. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate the contribution to the electron scattering rate from the surface level atoms (SLA), proposed in [A.M. Dyugaev, P.D. Grigoriev, JETP Lett. 78, 466 (2003)]. The inclusion of these states into account was sufficient to explain the long-standing puzzles in the temperature dependence of the surface tension of both He isotopes and to reach a very good agreement between theory and experiment. We calculate the contribution from these SLA to the surface electron scattering rate and explain some features in the temperature dependence of the surface electron mobility. This contribution is essential at low temperature $T<0.5$ when the He vapor concentration is exponentially small. For an accurate calculation of the electron mobility one also needs to consider the influence of the clamping electric field on the surface electron wave function and the temperature dependence of the He3 chemical potential.
description: 6 pages, 1 figure
Development of a social networking application for analyzing technical designs.:
Creators: name: Γαλανάκης, Γεώργιος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Εξόρυξη δεδομένων
Κοινωνικά δίκτυα
Τεχνικά σχέδια
Data mining
Social networks
CAD

description: Ελληνική Περίληψη Σκοπός της διατριβής ήταν η ανάπτυξη μιας εφαρμογής κοινωνικής δικτύωσης για την ανάλυση τεχνικών σχεδίων που προκύπτουν από σχεδιαστικά εργαλεία CAD. Οι νέες τάσεις στα προγράμματα που χρησιμοποιούνται για εκπονήσεις τεχνικών μελετών από μηχανικούς ευνοούν την αλληλεπίδραση μεταξύ των χρηστών σε πραγματικό χρόνο. Κατά τη στιγμή της σχεδίασης είναι σημαντικό να υπάρχουν γνώμες και κριτικές από άλλους χρήστες είτε είναι εξειδικευμένοι είτε όχι με σκοπό την παρουσίαση του καλύτερου δυνατού αποτελέσματος. Η χρήση των μέσων κοινωνικής δικτύωσης συμβάλλει με τον καλύτερο δυνατό τρόπο προς αυτή την κατεύθυνση. Στην εργασία παρουσιάζονται οι τεχνικές οι οποίες χρησιμοποιούνται στα μέσα με σκοπό την ανάλυση δεδομένων που προέρχονται από την αλληλεπίδραση των χρηστών και την εξαγωγή συμπερασμάτων.
description: Social networks can be used to improve the design part of a big company in which all employees that are relevant to the design process would share their opinion at the others in order to reach a quick and optimal result. In our application we present different data mining tasks over technical designs, in conjunction with natural processing language, to extract knowledge from people that using Twitter. Our goal is to highlight this particular process that will provide the best result for design.
The Interstellar Medium of IRAS 08572+3915 NW: H3+ and Warm High Velocity CO
Creators: name: Geballe, T. R.
name: Goto, M.
name: Usuda, T.
name: Oka, T.
name: McCall, B. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We confirm the first detection of the molecular ion H3+ in an extragalactic object, the highly obscured ultraluminous galaxy IRAS 08572+3915 NW. We also have detected absorption lines of the fundamental band of CO in this galaxy. The CO absorption consists of a cold component close to the systemic velocity and warm, highly blueshifted and redshifted components. The warm blueshifted component is remarkably strong and broad and extends at least to -350 km/s. Some analogies can be drawn between the H3+ and cold CO in IRAS08572+3915 NW and the same species seen toward the Galactic center. The profiles of the warm CO components are not those expected from a dusty torus of the type thought to obscure active galactic nuclei. They are probably formed close to the dust continuum surface near the buried and active nucleus and are probably associated with an unusual and energetic event there.
description: 21 pages, 4 postscript figures, accepted by ApJ
Radiation reaction in curved space-time: local method
Creators: name: Gal'tsov, Dmitri
name: Spirin, Pavel
name: Staub, Simona
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Although consensus seems to exist about the validity of equations accounting for radiation reaction in curved space-time, their previous derivations were criticized recently as not fully satisfactory: some ambiguities were noticed in the procedure of integration of the field momentum over the tube surrounding the world-line. To avoid these problems we suggest a purely local derivation dealing with the field quantities defined only {\em on the world-line}. We consider point particle interacting with scalar, vector (electromagnetic) and linearized gravitational fields in the (generally non-vacuum) curved space-time. To properly renormalize the self-action in the gravitational case, we use a manifestly reparameterization-invariant formulation of the theory. Scalar and vector divergences are shown to cancel for a certain ratio of the corresponding charges. We also report on a modest progress in extending the results for the gravitational radiation reaction to the case of non-vacuum background.
description: 10 pages, ws-procs9x6, published in "Gravitation and Astrophysics", Proceedings of the VII Asia-Pacific International Conference National Central University, Taiwan 23 - 26 November 2005, ed. J.M. Nester, C.-M. Chen, J.-P. Hsu. World Scientific, 2006, pp. 345-354
Στατιστική ανάλυση ανοιχτών δεδομένων πληρωμών από κυβερνήσεις προς εταιρείες:
Creators: name: Ψαρράς, Λάζαρος Ηρακλή
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: ανοιχτά δεδομένα επιχειρήσεων
στατιστική ανάλυση ανοιχτών δεδομένων
ανάλυση δημοσίων δαπανών
business open data
statistical analysis open data
public spending analysis

description: Σκοπός της διπλωματικής αυτής εργασίας ήταν η μελέτη και στατιστική ανάλυση ανοιχτών δεδομένων πληρωμών κυβερνήσεων προς επιχειρήσεις. Για την τριετία 2010-12 εξετάσαμε την οικονομική πολιτική επτά χωρών-κυβερνήσεων, μελετώντας τις δαπάνες τους απέναντι σε 24 ιδιωτικές εταιρείες. Επίσης, συνδυάσαμε τα ανοιχτά δεδομένα των πληρωμών των κυβερνήσεων, με στοιχεία των ισολογισμών των εταιρειών οι οποίες δέχθηκαν τις πληρωμές αυτές και προσπαθήσαμε να βρούμε συσχετίσεις. Επιπρόσθετα, αποπειραθήκαμε να κάνουμε μια ομαδοποίηση των εξόδων της κάθε κυβέρνησης στους διάφορους τομείς της οικονομίας, βασιζόμενοι αποκλειστικά σε μεμονωμένες πληρωμές από ανοιχτά δεδομένα. Ακόμα έχοντας ως δείκτη ευημερίας της κάθε επιχείρησης την κατάταξη της στη λίστα Forbes 2000 της αντίστοιχης χρονιάς, διαπιστώσαμε τη μη ύπαρξη συσχέτισης της προόδου της, με τις κυβερνητικές πληρωμές τις οποίες δέχθηκε στο διάστημα που μελετήθηκε.
description: The aim of the present thesis was to study and analyze a dataset of open data, concerning government payments spent to companies . For the three years 2010-12, we examined the economic policy of seven countries – governments, by studying their spending across a sample of 24 private companies. Furthermore, we combined the open data of payments of governments, with elements of the balance sheets of the companies that received these payments and tried to find correlations. In addition, we attempted to do a grouping of expenses of every government in the various sectors of the economy, based solely on individual payments of open data . Finally, by having the ranking in Forbes 2000 list of the corresponding year as a welfare indicator of each firm, we found the lack of correlation between the progress of the company and the sum of payments it accepted in the period we studied.
Das Modell der didaktischen Rekonstruktion in der Ausbildung von Geographie-lehrkräften – ein Lehr- und Lernangebot zur vertieften Auseinandersetzung mit Un-terrichtsplanung und -reflexion
Creators: name: Reinfried, Sibylle
Publisher: name: Herausforderung Lehrer*innenbildung - Zeitschrift zur Konzeption, Gestaltung und Diskussion
Year: 2021

description: Dieser Beitrag ist ein Werkstattbericht über ein Seminar an Pädagogischen Hochschulen in der Fachdidaktik Geographie, in dem Lehramtsstudierende für die Sekundarstufe I ausgebildet wurden. Mit dem Seminar sollte ein professioneller Reflexionsrahmen geschaffen werden, in dem das Modells der didaktischen Rekonstruktion (Kattmann, Duit, Gropengießer, & Komorek, 1997) in seinen Bezügen zur Unterrichtspraxis diskutiert wird. Die Lernziele des Seminars bestanden darin, das Modell als Forschungs- und Entwicklungsrahmen für Unterricht kennenzulernen, sich detailliert mit dem Modell auseinanderzusetzen und Leitideen und Strategien für lernförderliche Lehr-Lernangebote zu entwickeln. Im Beitrag wird das Konzept des Seminars vorgestellt und ein didaktisch rekonstruierter Unterrichtsvorschlag, der im Seminar entstanden ist, präsentiert. Es wird diskutiert, welche Lernfortschritte die Studierenden im Seminar erzielen konnten und mit welchen Lernschwierigkeiten sie zu kämpfen hatten. Die Problematik, die sich daraus ergibt, dass das Modell für die Geographie, ein Fach mit natur- und sozialwissenschaftlichen Themen, genutzt werden soll, wird dargestellt.
description: Herausforderung Lehrer*innenbildung - Zeitschrift zur Konzeption, Gestaltung und Diskussion, Bd. 4 Nr. 2 (2021): Das Modell der Didaktischen Rekonstruktion – Rahmen und Impulsgeber für die Entwicklung von Fachdidaktik und Unterricht
Erträge didaktischer Rekonstruktion für Forschung und Unterricht am Beispiel von Lernaufgaben zum experimentellen Denken und Arbeiten
Creators: name: Vorholzer, Andreas
Publisher: name: Herausforderung Lehrer*innenbildung - Zeitschrift zur Konzeption, Gestaltung und Diskussion
Year: 2021

description: Das Modell der Didaktischen Rekonstruktion wird seit über 20 Jahren in der Naturwissenschaftsdidaktik und darüber hinaus als theoretischer Rahmen für fachdidaktische Forschung und für die Entwicklung von Lernangeboten genutzt. Im Fokus der drei mit der didaktischen Rekonstruktion verbundenen Untersuchungsaufgaben – fachliche Klärung, Erfassung der Schüler*innenper-spektive, didaktische Strukturierung – stehen dabei in der Regel fachinhaltliche Lerngegenstände (z.B. Evolution, Chaostheorie oder Klimawandel). Im Gegensatz dazu liegen bisher kaum forschungs- oder entwicklungsorientierte Arbeiten vor, in denen das Modell auf prozessbezogene Lerngegenstände (z.B. aus den Kompetenzbereichen Erkenntnisgewinnung oder Kommunikation) bezogen wird. Dem Beitrag liegt eine Interventionsstudie zugrunde, in der das Modell der didaktischen Rekonstruktion zur Entwicklung eines mehrere Schulstunden umfassenden Lernangebots genutzt wurde, welches auf den Aufbau experimenteller Denk- und Ar-beitsweisen ausgerichtet ist. Anhand des Beispiels der vorgestellten Studie wird im Beitrag zum einen dargestellt, wie die Untersuchungsaufgaben des Modells auf einen prozessbezogenen Lerngegenstand bezogen sowie welche Prinzipien für die Entwicklung eines solchen Lernangebots aus Überlegungen zu diesen Aufgaben abgeleitet werden können. Ergänzend werden empirische Befunde eines Prä-Post-Vergleichs mit N = 222 Schüler*innen vorgestellt, die Evidenz für die Wirksamkeit des entlang dieser Prinzipien angelegten Lernangebots liefern. Zum anderen wird aus methodischer Perspektive diskutiert, welche Erträge der Einsatz des Modells der Didaktischen Rekonstruktion für Forschungsarbeiten liefern kann, in denen die Wirkung eines Lernangebots oder eines bestimmten Instruktionsmerkmals empirisch und unter möglichst kontrollierten Bedingungen untersucht werden soll.
description: Herausforderung Lehrer*innenbildung - Zeitschrift zur Konzeption, Gestaltung und Diskussion, Bd. 4 Nr. 2 (2021): Das Modell der Didaktischen Rekonstruktion – Rahmen und Impulsgeber für die Entwicklung von Fachdidaktik und Unterricht
High energy pA collisions in the Color Glass Condensate approach
Creators: name: Tuchin, Kirill
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a brief review of phenomenological applications of the gluon saturation approach to the proton-nucleus collisions at high energies.
description: To appear in the proceedings of 2nd International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions June 9-16, 2006, Asilomar Conference Grounds, Pacific Grove, California
Chimera of Borrelia miyamotoi and Borrelia burgdorferi – a pathogen in a case of Alzheimer's Disease
Creators: name: MacDonald, Alan
Publisher: name: F1000Research
Year: 2015

description: Chronic infection of deep brain sites over many years may result in Alzheimer's disease. Biofilm communities of Borrelia miyamotoi and additional simultaneous biofilms of Borrelia burgdorferi are presented elsewhere on F1000Research.  Briefly, DNA probes ( Molecular Beacons) absolutely specific for gene equivalents ( Open reading Frames) of Borrelia named species are designed, purified, and validated for their specificity by Borrelia research laboratories in the USA and In Europe.  Validated Molecular Beacon DNA probes for Borrelia miyamotoi and for Borrelia burgdorferi are simultaneously hybridized with unstained sections from Braak VI Alzheimer's Hippocampus tissues. The sections are then examined by epifluorescence microscopy. Spirochetes containing the  Targeted DNA carried by the probes produce fluorescence, when exposed to monochromatic light which is specific for the fluorochromes which  are attached to the Bound Probes. Photomicrographs of the fluorescing microbes in human Alzheimer's brain tissues are obtained to document the successful FISH DNA Probe Hybridizations.

This is the very first report of the identification of chimeric Borrelia formed by union of the genomes of Borrelia miyamotoi ( a member of the Relapsing Fever Group of Borrelia spirochetes) - and genomes of Borrelia burgdorferi group (SL) - which is a family of named species of Borrelia including the Lyme disease spirochete Borrelia burgdorferi (ss) - ATCC accession 35210.

Chimeras of Borrelia, with present technology, are impossible to identify with serology (antibody) testing, because there is no current method available to mass produce chimeric proteins from such unique and heretofore completely unimagined novel Borrelia species. Chimeric Borrelia (miyamotoi/burgdorferi)  have been identified Inside of biofilm communities dwelling inside of amyloid Alzheimer's plaques. These data will be presented in a subsequent F1000 Poster.
High-Energy Aspects of Astrophysical Jets
Creators: name: Levinson, Amir
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Various aspects of the high-energy emission from relativistic jets associated wi th compact astrophysical systems are reviewed. The main leptonic and hadronic processes responsible for the production of high-energy $γ$-rays, very-high energy neutrinos and ultra-high energy cosmic rays are discussed. Relations between the $γγ$ pair production and photomeson production opacities are derived, and their consequences for the relative emission of $γ$-rays and neutrinos are examined. The scaling of the size and location of the various emission zones and other quantities with black hole mass and dimensionless luminosity is elucidated. The results are applied to individual classes of objects, including blazars, microquasars and gamma-ray bursts. It is concluded that if baryons are present in the jet at sufficient quantities, then under optimal conditions most systems exhibiting relativistic jets may be detectable by upcoming neutrino telescopes. An exception is the class of TeV blazars, for which $γ$-ray observations imply neutrino yields well below detection limit.
description: Invited review, references added, typos corrected, some changes made