cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Κυκλώματα επεξεργασίας σήματος από αισθητήρες: -Ενισχυτής οργανολογίας, -14-bit Μετατροπέας A/D:
Creators: name: Βουλκίδου, Ανδριάνα Αστρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ενισχυτής οργανολογίας
Μετατροπέας αναλογικού σήματος σε ψηφιακό
Σύστημα θερμοκρασίας
Instrumentation amplifier
Analog to digital converter
Temperature system

description: Το σήμα εξόδου του ενισχυτή οργανολογίας αποτελεί το σήμα εισόδου του μετατροπέα A/D. Τα χαρακτηριστικά του μετατροπέα είναι η υψηλή διακριτική ικανότητα (14-bit) και ο περιορισμένος αριθμός χαμένου κώδικα κατά την επεξεργασία του σήματος έτσι ώστε να διασφαλίζεται η αξιόπιστη μετάφραση του αναλογικού σήματος σε ψηφιακό.Τα αποτελέσματα των προσομοιώσεων επιβεβαιώνουν την λειτουργία των κυκλωμάτων εντός των απαιτούμενων προδιαγραφών και η αξιολόγηση των αποτελεσμάτων δείχνει την επιτακτική ανάγκη της χρησιμοποίησης τεχνικών απαλοιφής της εκτροπής τάσης και του 1/f θορύβου. Τέλος , έγινε η φυσική σχεδίαση του κυκλώματος του ενισχυτή οργανολογίας και τα αποτελέσματα της post-layout προσομοίωσης συγκρίνονται με τα αποτελέσματα της pre-layout προσομοίωσης. Στην συγκεκριμένη εργασία μελετήθηκε ένας ενισχυτή οργανολογίας και ένας μετατροπέας A/D για την ανάγνωση και επεξεργασία σημάτων που προέρχονται από έναν αισθητήρα θερμοκρασίας. Πιο συγκεκριμένα σχεδιάστηκε ένας ενισχυτής οργανολογίας μεγάλης ακρίβειας και ένας μετατροπέας A/D 14-bit αρχιτεκτονικής διπλής κλίσης. Και τα δύο κυκλώματα προσομοιώθηκαν στο περιβάλλον του εργαλείου Cadence σε CMOS τεχνολογία 0.18μm.Για την ανάγνωση του σήματος από τον αισθητήρα θερμοκρασίας και κατόπιν την ενίσχυσή του απαιτείται ένας ακριβής ενισχυτής οργανολογίας. Έτσι στα πλαίσια της διπλωματική αυτής σχεδιάστηκε ένας ενισχυτής ρευματικής λειτουργίας που χρησιμοποιεί τεχνική chopping για να παρέχει αξιόπιστα αποτελέσματα απαλλαγμένα από τις μη ιδανικότητες των ενισχυτών, όπως την εκτροπής τάσης και τον 1/f θόρυβο.
description: In this thesis work, a current mode instrumentation amplifier and a 14-bit Analog to Digital Converter for temperature sensor application have been studied. The circuits are implemented and simulated with Cadence tool in CMOS 0.18μm technology.In temperature sensor, accuracy is the main concern so chopping technique has been implemented in the instrumentation amplifier and a dual slope ADC has been selected. Dual slope ADC is very popular due to its simplicity and its mismatches immunity. In this ADC, there is no need of any DAC which reduces the cost of ADC. The instrumentation amplifier consists of two current conveyors second generation (CCII) and two pairs of choppers, one at the input and the other at the output. The designed dual slope ADC has three main components: integrator, comparator and control logic. The control logic has been designed with the standard cells of the given technology and only the counter has been written in Verilog-A code. Mixed-signal analysis has been performed to simulate the ADC circuit.Layout of the instrumentation amplifier has been designed and post-layout simulation has done successfully.
Temperature dependent photoluminescence of single CdS nanowires
Creators: name: Hoang, Thang Ba
name: Titova, L. V.
name: Jackson, H. E.
name: Smith, L. M.
name: Yarrison-Rice, J. M.
name: Lensch, J. L.
name: Lauhon, L. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Temperature dependent photoluminescence (PL) is used to study the electronic properties of single CdS nanowires. At low temperatures, both near-band edge (NBE) photoluminescence (PL) and spatially-localized defect-related PL are observed in many nanowires. The intensity of the defect states is a sensitive tool to judge the character and structural uniformity of nanowires. As the temperature is raised, the defect states rapidly quench at varying rates leaving the NBE PL which dominates up to room temperature. All PL lines from nanowires follow closely the temperature-dependent band edge, similar to that observed in bulk CdS.
description: 11 pages, 4 figures
Equatorial symmetry/antisymmetry of stationary axisymmetric electrovac spacetimes. II
Creators: name: Ernst, F. J.
name: Manko, V. S.
name: Ruiz, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this second paper devoted to the equatorial symmetry/antisymmetry of stationary axisymmetric electrovac spacetimes we show how two theorems proved in our previous paper (Ernst, Manko and Ruiz 2006 Class. Quantum Grav. 23, 4945) can be utilized to construct exact solutions that are equatorially symmetric or antisymmetric.
description: 11 pages, minor changes to match the published version
Large deviations in the symmetric simple exclusion process with slow boundaries
Creators: name: Derrida, Bernard
name: Hirschberg, Ori
name: Sadhu, Tridib
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We obtain the exact large deviation functions of the density profile and of the current, in the non-equilibrium steady state of a one dimensional symmetric simple exclusion process coupled to boundary reservoirs with slow rates. Compared to earlier results, where rates at the boundaries are comparable to the bulk ones, we show how macroscopic fluctuations are modified when the boundary rates are slower by an order of inverse of the system length.
description: 14 pages, 4 figures
Microscopic Models for Fusion Categories
Creators: name: Wolf, Ramona
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Category Theory (math.CT)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This is a PhD Thesis on the connection between subfactors (more precisely, their corresponding fusion categories) and Conformal Field Theory (CFT). Besides being a mathematically interesting topic on its own, subfactors have also attracted the attention of physicists, since there is a conjectured correspondence between these and CFTs. Although there is quite a persuasive body of evidence for this conjecture, there are some gaps: there exists a set of exceptional subfactors with no known counterpart CFT. Hence, it is necessary to develop new techniques for building a CFT from a subfactor. Here, it is useful to study the underlying mathematical structure in more detail: The even parts of every subfactor give rise to two Unitary Fusion Categories (UFCs), and it is a promising direction to study quantum spin systems constructed from these categories to find a connection to CFTs. The simplest example that requires new techniques for building a CFT is the Haagerup subfactor, since it is the smallest subfactor with index larger than 4. In this thesis, we investigate the question whether there is a CFT corresponding to the Haagerup subfactor via lattice models in one and two dimensions. The first task here is to find the F-symbols of the fusion category since these are crucial ingredients for the construction of a physical model in all of the models we consider in this thesis. We then investigate microscopic models such as the golden chain model and the Levin-Wen model in order to find evidence for a corresponding CFT. We find that there is no evidence for a corresponding CFT from the investigation of the UFCs directly and it is necessary to expand these studies to the corresponding unitary modular tensor category, which can, for instance, be obtained via the excitations of the Levin-Wen model.
description: PhD Thesis, Leibniz Universit\"at Hannover (2020)
X-ray reflection in the nearby Seyfert 2 galaxy NGC 1068
Creators: name: Pounds, K.
name: Vaughan, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use the full broad-band XMM-Newton EPIC data to examine the X-ray spectrum of the nearby Seyfert 2 galaxy NGC 1068, previously shown to be complex with the X-ray continuum being a sum of components reflected/scattered from cold (neutral) and warm (ionised) matter, together with associated emission line spectra. We quantify the neutral and ionised reflectors in terms of the luminosity of the hidden nucleus. Both are relatively weak, a result we interpret on the Unified Seyfert Model by a near side-on view to the putative torus, reducing the visibility of the illuminated inner surface of the torus (the cold reflector), and part of the ionised outflow. A high inclination in NGC 1068 also provides a natural explanation for the large (Compton-thick) absorbing column in the line-of-sight to the nucleus. The emission line fluxes are consistent with the strength of the neutral and ionised continuum components, supporting the robustness of the spectral model.
description: 8 pages. 7 figures. Accepted for publication in MNRAS
Lifespan of solutions to the Strauss type wave system on asymptotically flat space-times
Creators: name: Dai, Wei
name: Fang, Daoyuan
name: Wang, Chengbo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35L05, 35L15, 35L70, 35B33

description: By assuming certain local energy estimates on $(1+3)$-dimensional asymptotically flat space-time, we study the existence portion of the \emph{Strauss} type wave system. Firstly we give a kind of space-time estimates which are related to the local energy norm that appeared in \cite{MR2944027}. These estimates can be used to prove a series of weighted \emph{Strichartz} and \emph{KSS} type estimates, for wave equations on asymptotically flat space-time. Then we apply the space-time estimates to obtain the lower bound of the lifespan when the nonlinear exponents $p$ and $q\ge 2$. In particular, our bound for the subcritical case is sharp in general and we extend the known region of $(p,q)$ to admit global solutions. In addition, the initial data are not required to be compactly supported, when $p, q>2$.
description: Final version, to appear in Discrete and Continuous Dynamical System, 16 pages, 0 figure
Από το πέτρωμα στο έδαφος: Ο ρόλος της βιολογικής αποσάθρωσης στο σχηματισμό του εδάφους:
Creators: name: Παπαλεξανδρής, Χαράλαμπος Πασχάλη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Εδαφογέννεση
Βιολογική αποσάθρωση
Λειχήνες, Βρύα
Soil formation
Biological weathering
Lichen, Mosses

description: Στην παρούσα εργασία επιχειρήθηκε να αναλυθεί ο ρόλος της βιολογικής αποσάθρωσης στο σχηματισμό του εδάφους. Επιλέχτηκαν πέντε διαφορετικά πετρώματα από διάφορες περιοχές της Β. Ελλάδος ( γρανίτης, ρυόλιθος, σχιστόλιθος, ασβεστόλιθος και φλύσχης). Σε καθένα από αυτά ελήφθησαν εδαφικά δείγματα από τα στάδια διαδοχής εγκατάστασης της βλάστησης στα πετρώματα ( λειχήνες, βρύα, ποώδη φυτά). Συνολικά ελήφθησαν 90 δείγματα. Μετρήθηκαν κατόπιν τα εξής χημικά στοιχεία: το οργανικό άζωτο με τη μέθοδο Kjeldahl, η οργανική ουσία με τη μέθοδο της υγρής οξείδωσης, ο εκχυλίσιμος φώσφορος με τη μέθοδο Olsen, οι συγκεντρώσεις των ανταλλάξιμων κατιόντων Ca, Mg, K, Na και τέλος οι συγκεντρώσεις των στοιχείων Fe, Cu, Zn, Mn με διάλυμα DTPA, με τη μέθοδο της φασματοφωτομετρικής ατομικής απορρόφησης. Τα δεδομένα επεξεργάστηκαν με το στατιστικό πακέτο S.P.S.S. με τη μέθοδο της AN.O.VA. Τα αποτελέσματα καταδεικνύουν ότι ο ρόλος της βιολογικής αποσάθρωσης στο σχηματισμό του εδάφους είναι σημαντικός. Επίσης, ότι υπάρχει στατιστικά σημαντική διαφοροποίηση της οργανικής ουσίας με την εναλλαγή της βλάστησης και του πετρώματος. Τέλος, γίνονται προτάσεις για μελλοντική έρευνα.
description: In the present study it was attempted to analyze the role of biological weathering in the soil formation. It was selected five different rock types from different regions of Northern Greece (granite, rhyolites, slate, limestone and flysch). In each of these soil samples were taken from the plant successional stages of vegetation on the rocks (lichens, mosses, herbaceous plants). Altogether 90 samples were taken. Then it was measured the following chemical elements: organic nitrogen by Kjeldahl method, the organic substance by the method of wet oxidation extractable phosphorus method (Olsen), the concentrations of exchangeable cations Ca, Mg, K, Na, and finally the concentrations of elements Fe, Cu, Zn, Mn solution with DTPA, using the atomic absorption spectrophotometric. The data processed with the SPSS statistical package using the AN.O.VA. The results show that the role of biological weathering in soil formation is important. Also, there is a statistically significant difference in organic matter with the alternation of vegetation and rock. Finally, suggestions are made for future research.
On Primes in Quadratic Progressions
Creators: name: Baier, Stephan
name: Zhao, Liangyi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11L07, 11L20, 11L40, 11N13, 11N32, 11N37

description: We verify the Hardy-Littlewood conjecture on primes in quadratic progressions on average. The results in the present paper significantly improve those of a previous paper of the authors(arXiv:math.NT/0605563).
description: Fourteen(14) pages, minor changes were made and a longer instruction was given
Twisted D-branes of the SU(N)_K WZW model and level-rank duality
Creators: name: Naculich, Stephen G.
name: Schnitzer, Howard J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the level-rank duality of omega_c-twisted D-branes of SU(N)_K (when N and K>2). When N or K is even, the duality map involves Z_2-cominimal equivalence classes of twisted D-branes. We prove the duality of the spectrum of an open string stretched between omega_c-twisted D-branes, and ascertain the relation between the charges of level-rank-dual omega_c-twisted D-branes.
description: 24 pages. v2: reference added
Conceptions of teaching mathematics: the ideas of six pre-service secondary mathematics teachers
Creators: name: Lee, Rosalind Chui Mei
Publisher: name: University of British Columbia
Year: 2009

description: "I am a math teacher." This simple statement evokes a plethora of images. Elucidating pre-service teachers' personal meanings for this statement adds to the knowledge base for teacher education. Knowing their own beliefs and ideas about teaching also provides teacher candidates a basis from which to consider alternative conceptions. In this investigation, six pre-service teachers of secondary- mathematics were interviewed about their ideas of teaching mathematics at the conclusion of their extended practicum. Al l had bachelor's degrees with a mathematics specialty; three had pursued graduate study in pure or applied mathematics. Results show all six teacher candidates had different conceptions of teaching mathematics. Some emphasized the content of mathematics; others emphasized mathematical processes. Some gave priority in their teaching perspective to student development and cognitive skills. Those who had studied graduate level mathematics expressed a desire to make math interesting and stimulating for students. Results support the constructivist ideas that conceptions are personally formed and past experiences are influential in shaping them.
Πιλοτική χρήση Λογισμικού Ανοικτού Κώδικα Πληροφοριακών Συστημάτων Διαχείρισης Επιχειρησιακών Πόρων:
Creators: name: Ζάχου, Ελευθερία Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Συστήματα ERP
Λογισμικό ανοικτού κώδικα
Openbravo ERP
ERP systems
Open source software

description: Τα Πληροφοριακά Συστήματα Διαχείρισης Επιχειρησιακών Πόρων (Enterprise Resource Planning Systems – ERP systems) χαρακτηρίζονται ως μία επιχειρηματική λύση η οποία επηρεάζει σχεδόν κάθε πτυχή της επιχείρησης, όπως την δομή, τις διαδικασίες, τον έλεγχο, τους εργαζόμενους. Αποτελούνται από ένα σύνολο υποσυστημάτων (modules) τα οποία διαχειρίζονται μία συγκεκριμένη λειτουργία της επιχείρησης. Αντικειμενικός σκοπός της παρούσας διπλωματικής εργασίας είναι η εφαρμογή ενός Λογισμικού Ανοικτού Κώδικα Διαχείρισης Επιχειρησιακών Πόρων. Συγκεκριμένα, διεξάχθηκε μία συγκριτική μελέτη για την επιλογή του λογισμικού που θα χρησιμοποιηθεί στην διπλωματική αυτή εργασία. Τα λογισμικά τα οποία συμπεριλήφθησαν στην συγκριτική μελέτη είναι ελεύθερα και ανοικτού κώδικα και αυτό που τελικώς επιλέχθηκε για τη διεξαγωγή της είναι το Openbravo ERP. Μέσω της μελέτης περίπτωσης εξετάζεται η ολοκλήρωση και η ενοποίηση των λειτουργιών και πληροφοριών της επιχείρησης που παρέχονται από το σύστημα, καθώς επίσης και οι δυνατότητες και τα οφέλη που απορρέουν από την εφαρμογή του λογισμικού προγράμματος στο σύνολο της εταιρίας. Επιπλέον, εξετάζονται οι αρνητικές επιπτώσεις καθώς και τα μειονεκτήματα του συστήματος ενώ προκύπτουν ιδιαιτέρως σημαντικά συμπεράσματα από την διεξαγωγή της εφαρμογής.
description: Enterprise Resource Planning Systems (ERP systems) are characterized as a business solution which affects almost every aspect of the business, such as the structure, the procedures, the control, the employees. They are consisted of a set of subsystems (modules) which manage a specific business operation. The objective of this thesis is to implement an open source Enterprise Resource Planning System. Specifically, a comparative study for the selection of the software was conducted in order to be used in this thesis. The software which were included in the survey are free and open source and the one that was selected to conduct this thesis is the Openbravo ERP. Through the case study are examined the integration and the consolidation of functions and information of business which are provided by the system as well as the potentials and the benefits of the software application program throughout the company. The negative effects and the disadvantages of the system are also examined while very important conclusions are generated from the conduct of the application.
Resilience and Charge-Dependent Fibrillation of Functional Amyloids: Interactions of Pseudomonas Biofilm-Associated FapB and FapC
Creators: name: Golan, Nimrod
name: Parizat, Amit
name: Tabachnikov, Orly
name: Barnea, Eilon
name: Olsen, William P.
name: Otzen, Daniel E.
name: Landau, Meytal
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2024

description: doi:10.1101/2024.02.14.580233
description: FapC and FapB are biofilm-associated amyloids involved in the virulence of Pseudomonas and other bacteria. We herein demonstrate their exceptional thermal and chemical resilience, suggesting that biofilm structures might withstand standard sterilization, thereby contributing to the persistence of P. aeruginosa infections. Our findings also underscore the impact of environmental factors on Fap proteins, suggesting that orthologs in different Pseudomonas strains adapt to specific environments and roles. Challenging previous assumptions about a simple nucleation role for FapB in promoting FapC aggregation, the study shows a significant influence of FapC on FapB aggregation. The interaction between FapB and FapC is intricate: FapB stabilizes FapC fibrils, while FapC slows down FapB fibrillation but can still serve as a cross-seeding template. This complex interplay is key to understanding their roles in bacterial biofilms. Furthermore, the study highlights distinct differences between Fap and E. coli’s curli CsgA amyloid, where CsgB assumes a simple unidirectional role in nucleating CsgA fibrillation, emphasizing the importance of a comprehensive understanding of various amyloid systems. This knowledge is vital for developing effective intervention strategies against bacterial infections and leveraging the unique properties of these amyloids in technological applications such as novel bio-nanomaterials or protective coatings.
The Implementation of the ASEAN Agreement on Transboundary Haze Pollution within the of Law: Framework Indonesian Comparative Study Malaysia and Singapore
Creators: name: Tarigas, Paulina
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 480203
subject: Environmental law

description: This research analyses the legal framework concerning the environmental law in Indonesia, Malaysia and also Singapore specifically focusing on transboundary haze pollution within the ASEAN Agreement.
On several problems about automorphisms of the free group of rank two
Creators: name: Lee, Donghi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20E36, 20F05, 20F10, 20F28

description: Let $F_n$ be a free group of rank $n$. In this paper we discuss three algorithmic problems related to automorphisms of $F_2$. A word $u$ of $F_n$ is called positive if $u$ does not have negative exponents. A word $u$ in $F_n$ is called potentially positive if $ϕ(u)$ is positive for some automorphism $ϕ$ of $F_n$. We prove that there is an algorithm to decide whether or not a given word in $F_2$ is potentially positive, which gives an affirmative solution to problem F34a in [1] for the case of $F_2$. Two elements $u$ and $v$ in $F_n$ are said to be boundedly translation equivalent if the ratio of the cyclic lengths of $ϕ(u)$ and $ϕ(v)$ is bounded away from 0 and from $\infty$ for every automorphism $ϕ$ of $F_n$. We provide an algorithm to determine whether or not two given elements of $F_2$ are boundedly translation equivalent, thus answering question F38c in the online version of [1] for the case of $F_2$. We further prove that there exists an algorithm to decide whether or not a given finitely generated subgroup of $F_2$ is the fixed point group of some automorphism of $F_2$, which settles problem F1b in [1] in the affirmative for the case of $F_2$.
description: 30 pages
The influence of environment – natural and human constructed – on the productivity of regional innovation systems:
Creators: name: Μίχου, Βασιλική Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Περιφερειακό Σύστημα Καινοτομίας
Περιβάλλον
Καινοτομική διαδικασία
Regional Innovation System
Environment
Innovation process

description: Σκοπός της παρούσας εργασίας είναι να τονίσει την σημαντικότητα των περιβαλλοντικών παραγόντων στη διαδικασία της καινοτομικής δραστηριότητας. Η έννοια του περιβάλλοντος εξετάζεται σαν ένα πολυδιάστατο φαινόμενο που λαμβάνει υπόψη τις δυνατότητες κάθε περιοχής. Οι τρεις όψεις του περιβάλλοντος που εξετάζονται είναι οι εξής: το ανθρωπογενές περιβάλλον (υποδομές μεταφορών), το φυσικό περιβάλλον συμπεριλαμβανομένων των κλιματικών συνθηκών και το θεσμικό περιβάλλον με την έννοια του ασφαλούς περιβάλλοντος (επίδραση της εγκληματικότητας στην οικονομική δραστηριότητα). Η ανάλυση πραγματοποιείται σε περιφερειακό επίπεδο χρησιμοποιώντας δεδομένα πάνελ για τις 168 περιφέρειες των πέντε μεγαλύτερων χωρών της Ευρωπαϊκής Ένωσης (Γερμανία, Γαλλία, Ισπανία, Ιταλία, Ηνωμένο Βασίλειο) για την περίοδο 1995-2007. Τα αποτελέσματα της ανάλυσής μας υποστηρίζουν σε γενικές γραμμές τις υποθέσεις που κάναμε. Το σημαντικότερο αποτέλεσμα προέρχεται από την υπόθεση για το φυσικό περιβάλλον, όπου βρήκαμε ότι ο αριθμός των ημερών βροχής σε μια περιοχή επηρεάζει αρνητικά την παραγωγικότητα των ερευνητών. Καταλήξαμε επίσης στο συμπέρασμα ότι η παραγωγικότητα των ερευνητών επηρεάζεται σημαντικά από την ποιότητα των μεταφορικών υποδομών και λιγότερο από την εγκληματικότητα.
description: The objective of this paper is to outline the importance of environmental factors in the innovation process. Environment is examined under a multidimensional scope taking into consideration the regional capabilities. We analyze three aspects of the environment: the human constructed environment and more specifically the transportation infrastructure, the natural environment, including climatic conditions, and the safe environment that stands for various forms of crime affecting economic performance. The analysis is conducted at regional level using panel data for the 168 regions (NUTS II classification) of the five largest countries of European Union (Germany, France, Spain, Italy, United Kingdom) for the period 1995-2007. The results of our analysis are in general supportive of the hypotheses being made with the strongest evidence coming from the natural environment and more specifically from the weather conditions. We found that the number of days of rain in a region affects negatively the researchers’ productivity. Also, we concluded that the better the transportation infrastructure the higher the researchers’ productivity but we found little evidence that supports that criminality is a negative factor affecting economic activity.
The internal kinematics of dwarf spheroidal galaxies
Creators: name: Wilkinson, M. I.
name: Kleyna, J. T.
name: Evans, N. W.
name: Gilmore, G. F.
name: Read, J. I.
name: Koch, A.
name: Grebel, E. K.
name: Irwin, M. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The status of kinematic observations in Local Group dwarf spheroidal galaxies (dSphs) is reviewed. Various approaches to the dynamical modelling of these data are discussed and some general features of dSph dark matter haloes based on simple mass models are presented.
description: 8 pages, 5 figs. Invited review in Proceedings of XXIst IAP Colloquium, "Mass Profiles & Shapes of Cosmological Structures" (Paris, 4-9 July 2005), eds G.A. Mamon, F. Combes, C. Deffayet, B. Fort (Paris: EDP Sciences)
Quantum-classical nonadiabatic dynamics of Floquet driven systems
Creators: name: Schirò, Marco
name: Eich, Florian G.
name: Agostini, Federica
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We develop a trajectory-based approach for excited-state molecular dynamics simulations of systems subject to an external periodic drive. We combine the exact-factorization formalism, allowing to treat electron-nuclear systems in nonadiabatic regimes, with the Floquet formalism for time-periodic processes. The theory is developed starting with the molecular time-dependent Schroedinger equation with inclusion of an external periodic drive that couples to the system dipole moment. With the support of the Floquet formalism, quantum dynamics is approximated by combining classical-like, trajectory-based, nuclear evolution with electronic dynamics represented in the Floquet basis. The resulting algorithm, which is an extension of the coupled-trajectory mixed quantum-classical scheme for periodically driven systems, is applied to a model study, exactly solvable, with different field intensities.
Dark matter maps reveal cosmic scaffolding
Creators: name: Massey, Richard
name: Rhodes, Jason
name: Ellis, Richard
name: Scoville, Nick
name: Leauthaud, Alexie
name: Finoguenov, Alexis
name: Capak, Peter
name: Bacon, David
name: Aussel, Herve
name: Kneib, Jean-Paul
name: Koekemoer, Anton
name: McCracken, Henry
name: Mobasher, Bahram
name: Pires, Sandrine
name: Refregier, Alexandre
name: Sasaki, Shunji
name: Starck, Jean-Luc
name: Taniguchi, Yoshi
name: Taylor, Andy
name: Taylor, James
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Ordinary baryonic particles (such as protons and neutrons) account for only one-sixth of the total matter in the Universe. The remainder is a mysterious "dark matter" component, which does not interact via electromagnetism and thus neither emits nor reflects light. As dark matter cannot be seen directly using traditional observations, very little is currently known about its properties. It does interact via gravity, and is most effectively probed through gravitational lensing: the deflection of light from distant galaxies by the gravitational attraction of foreground mass concentrations. This is a purely geometrical effect that is free of astrophysical assumptions and sensitive to all matter -- whether baryonic or dark. Here we show high fidelity maps of the large-scale distribution of dark matter, resolved in both angle and depth. We find a loose network of filaments, growing over time, which intersect in massive structures at the locations of clusters of galaxies. Our results are consistent with predictions of gravitationally induced structure formation, in which the initial, smooth distribution of dark matter collapses into filaments then into clusters, forming a gravitational scaffold into which gas can accumulate, and stars can be built.
description: 10 pages, 5 figures... plus 6 pages, 7 figures of supplementary information. An officially typset version is available from the Nature website at http://www.nature.com/nature/journal/v445/n7125/abs/nature05497.html and the front cover of Nature featuring the mass map is available in PDF format from http://www.astro.caltech.edu/~rjm/publicity/Nature180107_cover.pdf
Phase sensitivity approaching quantum Cramer-Rao bound in a modified SU(1,1) interferometer
Creators: name: Zhang, Jian-Dong
name: You, Chenglong
name: Li, Chuang
name: Wang, Shuai
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: SU(1,1) interferometers, based on the usage of nonlinear elements, are superior to passive interferometers in phase sensitivity. However, the SU(1,1) interferometer cannot make full use of photons carrying phase information as the second nonlinear element annihilates some of the photons inside. Here, we focus on improving phase sensitivity and propose a new protocol based on a modified SU(1,1) interferometer, where the second nonlinear element is replaced by a beam splitter. We utilize two coherent states as inputs and implement balanced homodyne measurement at the output. Our analysis suggests that the protocol we propose can achieve sub-shot-noise-limited phase sensitivity and is robust against photon loss and background noise. Our work is important for practical quantum metrology using SU(1,1) interferometers.
Chandra X-ray counterpart of KS 1741-293
Creators: name: Marti, J.
name: Combi, J. A.
name: Perez-Ramirez, D.
name: Garrido, J. L.
name: Luque-Escamilla, P.
name: Munoz-Arjonilla, A. J.
name: Sanchez-Sutil, J. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We aim to investigate the nature of the high energy source KS 1741-293 by revisiting the radio and infrared associations proposed in the early 1990s. Our work is mostly based on the analysis of modern survey and archive data, including the NRAO, MSX, 2MASS and Chandra archives, and catalogues. We also have obtained deep CCD optical observations by ourselves. The coincidence of KS 1741-293 with an extended radio and far-infrared source, tentatively suggested in 1994, is no longer supported by modern observational data. Instead, a Chandra source is the only peculiar object found to be consistent with all high-energy error circles of KS 1741-293 and we propose it to be its most likely X-ray counterpart. We also report the existence of a non-thermal radio nebula in the vicinity of the KS 1741-293 position with the appearance of a supernova remnant. The possibility of being associated to this X-ray binary is discussed.
description: 5 pages, 4 figures, 2 tables. Accepted for publication in Astronomy & Astrophysics
The many origins of charge inversion in electrolyte solutions: effects of discrete interfacial charges
Creators: name: Faraudo, J.
name: Travesset, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that charge inversion, i.e. interfacial charges attracting counterions in excess of their own nominal charge, is a general effect that takes place in most charged systems next to aqueous solutions with multivalent ions and identify three different electrostatic origins for this effect 1) counterion-counterion correlations, 2) correlations between counterions and interfacial charges and 3) complexation. We briefly describe the first two regimes and provide a detailed characterization of the complexation regime from united atom molecular dynamics simulation of a phospholipid domain in contact with an aqueous solution. We examine the expected conditions where each regime should apply and describe a representative experimental example to illustrate each case. We point out that our results provide a characterization of ionic distributions irrespectively of whether charge inversion takes place and show that processes such as proton release and transfer are also linked to ionic correlations. We conclude with a discussion of further experimental and theoretical implications.
description: 22 pages, 7 figures
Large Deviations for the Stochastic Shell Model of Turbulence
Creators: name: Manna, U.
name: Sritharan, S. S.
name: Sundar, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60F10, 60H15, 76D03, 76D06

description: In this work we first prove the existence and uniqueness of a strong solution to stochastic GOY model of turbulence with a small multiplicative noise. Then using the weak convergence approach, Laplace principle for so- lutions of the stochastic GOY model is established in certain Polish space. Thus a Wentzell-Freidlin type large deviation principle is established utilizing certain results by Varadhan and Bryc.
description: 21 pages, submitted for publication
Buckling bars in nearly face-on galaxies observed with MaNGA
Creators: name: Xiang, K. M.
name: Nataf, D. M.
name: Athanassoula, E.
name: Zakamska, N. L.
name: Rowlands, K.
name: Masters, K.
name: Fraser-McKelvie, A.
name: Drory, N.
name: Kraljic, K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Over half of disk galaxies are barred, yet the mechanisms for bar formation and the life-time of bar buckling remain poorly understood. In simulations, a thin bar undergoes a rapid (<1 Gyr) event called "buckling," during which the inner part of the bar is asymmetrically bent out of the galaxy plane and eventually thickens, developing a peanut/X-shaped profile when viewed side-on. Through analyzing stellar kinematics of N-body model snapshots of a galaxy before, during, and after the buckling phase, we confirm a distinct quadrupolar pattern of out-of-plane stellar velocities in nearly face-on galaxies. This kinematic signature of buckling allows us to identify five candidates of currently buckling bars among 434 barred galaxies in the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) Survey, an integral field unit (IFU) spectroscopic survey that measures the composition and kinematic structure of nearby galaxies. The frequency of buckling events detected is consistent with the 0.5-1 Gyr timescale predicted by simulations. The five candidates we present more than double the total number of candidate buckling bars, and are the only ones found using the kinematic signature.
description: 22 pages, 12 figures. Accepted for publication in ApJ
The index of the overlap Dirac operator on a discretized 2d non-commutative torus
Creators: name: Aoki, Hajime
name: Nishimura, Jun
name: Susaki, Yoshiaki
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The index, which is given in terms of the number of zero modes of the Dirac operator with definite chirality, plays a central role in various topological aspects of gauge theories. We investigate its properties in non-commutative geometry. As a simple example, we consider the U(1) gauge theory on a discretized 2d non-commutative torus, in which general classical solutions are known. For such backgrounds we calculate the index of the overlap Dirac operator satisfying the Ginsparg-Wilson relation. When the action is small, the topological charge defined by a naive discretization takes approximately integer values, and it agrees with the index as suggested by the index theorem. Under the same condition, the value of the index turns out to be a multiple of N, the size of the 2d lattice. By interpolating the classical solutions, we construct explicit configurations, for which the index is of order 1, but the action becomes of order N. Our results suggest that the probability of obtaining a non-zero index vanishes in the continuum limit, unlike the corresponding results in the commutative space.
description: 22 pages, 8 figures, LaTeX, JHEP3.cls. v3:figures 1 and 2 improved (all the solutions included),version published in JHEP
Συγκριτική μελέτη γεωμετρικού περιεχομένου και τοπωνυμίων στη Generalkarte: εφαρμογή στα φύλλα χάρτη που καλύπτουν το Ν. Θεσσαλονίκης
Creators: name: Ράντη, Ελένη Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Φύλλα χάρτη Generalkarte
Συγκριτική μελέτη
Μελέτη γεωμετρικού περιεχομένου και τοπωνυμίων
Φύλλα χάρτη Generalkarte που καλύπτουν το νομό Θεσσαλονίκης
Generalkarte map sheets
Comparative study
Study of geometric content and toponyms
Generalkarte map sheets covering the Prefecture of Thessaloniki

description: Αντικείμενο της μεταπτυχιακής εργασίας αποτέλεσε αρχικά, η ανάλυση της σπουδαίας σειράς χαρτών Generalkarte και των αντίστοιχων ελληνικών παράγωγών της ως προς τη γεωμετρική υποδομή και το γεωμετρικό περιεχόμενό τους. Σε επόμενο στάδιο, επιτεύχθηκε η σύγκριση τόσο μεταξύ αυτών των χαρτών όσο και σε σχέση με σύγχρονους χάρτες της Γεωγραφικής Υπηρεσίας Στρατού, ως προς το γεωμετρικό περιεχόμενο και τα τοπωνύμια. Η ανάλυση των χαρτών και οι συγκρίσεις αυτών αναφέρονται σε επίπεδο νομού. Ειδικότερα, την περιοχή μελέτης αποτελεί ο νομός Θεσσαλονίκης, για τον οποίο σημειώνονται οι ομοιότητες και οι διαφοροποιήσεις στα δίκτυα υποδομής, στα τοπωνύμια, στα ποτάμια και σε άλλα γεωμετρικά στοιχεία στους υπό σύγκριση χάρτες. Τέλος, αναδεικνύεται η σπουδαιότητα της σύγκρισης των ιστορικών χαρτών μέσω του μετασχηματισμού τους σε ψηφιακή μορφή, για την μελέτη όχι μόνο των γεωγραφικών μεταβολών αλλά και για τις αλλαγές στις χαρτογραφικές τεχνικές της αναπαράστασης που σημειώνονται κατά την πρώτη δεκαετία του 20ου αιώνα.
description: The subject of this master thesis was initially, the analysis of the geometric structure and the geometric content of the famous series of Generalkarte and their relevant Greek map sheets. The next step was the comparison between these maps and the modern maps constructed by the Hellenic Military Geographical Service, regarding the geometric content and toponyms. The comparisons and the analysis of these maps refer to an administrative level of a prefecture. In particular, the study area is the prefecture of Thessaloniki and all the maps are put in comparison in order to indicate the similarities and the differences regarding networks, toponyms, rivers and other geometric elements. Finally, it is very important to compare historical maps by transforming them into digital form, in order to study not only the geographic alterations which occurred in the first decades of the 20th century but also the changes in the cartographic representation techniques.
Decreasing the Surgical Errors by Neurostimulation of Primary Motor Cortex and the Associated Brain Activation via Neuroimaging
Creators: name: Gao, Yuanyuan
name: Cavuoto, Lora
name: Dutta, Anirban
name: Kruger, Uwe
name: Yan, Pingkun
name: Nemani, Arun
name: Norfleet, Jack E.
name: Makled, Basiel A.
name: Silvestri, Jessica
name: Schwaitzberg, Steven
name: Intes, Xavier
name: De, Suvranu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences
subject: 92-05

description: Acquisition of fine motor skills is a time-consuming process as it requires frequent repetitions. Transcranial electrical stimulation is a promising means of enhancing simple motor skill development via neuromodulatory mechanisms. Here, we report that non-invasive neurostimulation facilitates the learning of complex fine bimanual motor skills associated with a surgical task. During the training of 17 medical students on the Fundamentals of Laparoscopic Surgery (FLS) pattern cutting task over a period of 12 days, we observed that transcranial direct current stimulation (tDCS) decreased the error level and the variability in performance, compared to the Sham group. By concurrently monitoring the cortical activations of the subjects via functional near-infrared spectroscopy (fNIRS), our study showed that the cortical activation significantly stimulated by tDCS. The lowered performance error and the increased brain activation were retained after one-month post-training. This work supports the use of tDCS to enhance performance accuracy in fine bimanual motor tasks.
description: 5 figures
Mesonic Chiral Rings in Calabi-Yau Cones from Field Theory
Creators: name: Grant, Lars
name: Narayan, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the half-BPS mesonic chiral ring of the N=1 superconformal quiver theories arising from N D3-branes stacked at Y^pq and L^abc Calabi-Yau conical singularities. We map each gauge invariant operator represented on the quiver as an irreducible loop adjoint at some node, to an invariant monomial, modulo relations, in the gauged linear sigma model describing the corresponding bulk geometry. This map enables us to write a partition function at finite N over mesonic half-BPS states. It agrees with the bulk gravity interpretation of chiral ring states as cohomologically trivial giant gravitons. The quiver theories for L^aba, which have singular base geometries, contain extra operators not counted by the naive bulk partition function. These extra operators have a natural interpretation in terms of twisted states localized at the orbifold-like singularities in the bulk.
description: Latex, 25pgs, 12 figs, v2: minor clarifications
Μορφολογικές παρατηρήσεις στο ιστορικό ποίημα του Σταυρινού Βιστιάρη:
Creators: name: Σαλιακούρα, Ευαγγελία Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Μορφολογία
Ονοματικό σύστημα
Ρηματικό σύστημα
Αντωνυμικό σύστημα
Νεοελληνική διαλεκτολογία
Morphology
Nominal system
Verbal system
Modern Greek dialectology

description: Στόχος της παρούσας εργασίας είναι να γίνουν μορφολογικές παρατηρήσεις της γλώσσας στην οποία είναι γραμμένο το ιστορικό ποίημα του Σταυρινού Βιστιάρη. Δίνεται έμφαση στο ρηματικό και στο ονοματικό σύστημα. Είναι βέβαιο ότι υπάρχουν περιορισμοί από την γραπτή μορφή του υλικού μας, από το είδος στο οποίο ανήκει - είναι ένα λογοτεχνικό κείμενο και μάλιστα ποιητικό με ό,τι αυτό συνεπάγεται για τη γλώσσα του - καθώς και την περιορισμένη έκτασή του, ωστόσο θα γίνει προσπάθεια να εντοπιστούν μορφολογικές ιδιαιτερότητες του ιδιώματος, ενώ θα γίνει και μια απόπειρα σύγκρισης με την κοινή νεοελληνική και με άλλες νεοελληνικές διαλέκτους. Ενδεικτικά θα εξεταστεί η ύπαρξη η όχι απλούστευσης του κλιτικού συστήματος σε σχέση με την κοινή (πολλές φορές τέτοιου είδους απλουστεύσεις οφείλονται στην απουσία επίδρασης της αρχαίας ελληνικής) αλλά και η ύπαρξη ή όχι ιδιαίτερων μορφολογικών τύπων. Στο τέλος θα επιχειρήσουμε να κατατάξουμε τη γλώσσα σε μια από τις ομάδες των νεοελληνικών ιδιωμάτων, αλλά και να ελέγξουμε αν η διαπίστωση του Vincent περί «πανελλήνιας δημοτικής» και της Πηδώνια περί ύπαρξης στοιχείων του κρητικού ιδιώματος ευσταθούν.
description: The purpose of this essay is to make morphological observations about the language in which the historical poem by Stavrinos Vistiaris is written. Emphasis is laid on the verbal and nominal system. It is indisputable that there are restrictions deriving from the written form of our material, from its genre- it is a literary text and more than that it is a poetic one with whatever this entails linguistically- and from its limited size. Nevertheless, an attempt will be made to locate morphological particularities of the dialect. At the same time, a comparison with the colloquial Modern Greek and other Modern Greek dialects will be attempted. Indicatively, there is going to be an examination of whether there are any simplifications of the conjugation system in connection with the colloquial language ( it is often the case that such simplifications are attributed to the absence of any influence of the ancient greek ) and also whether there are any special morphological versions or not. Finally we will attempt to classify the language to one of the groups of Modern Greek dialects and also to verify whether Vincent’ s finding concerning “ a PanHellenic demotic language and Pidonia’ s ascertainment of the existence of elements of the Cretan dialect stand up.
Assessment of the management strategies for learning resources in Vancouver schools
Creators: name: Hannis, E. Marilyn
Publisher: name: University of British Columbia
Year: 2009

description: Significant changes to the British Columbia's educational system have been caused by new curriculums that are based on a resource-based learning and teaching model. The Ministry of Education evaluates learning resources and allocates funding to support the acquisition of learning resources at the district and school level. Learning resources selected for classroom use are to support the Principles of Learning: • learning requires the active participation of the student; • people learn in a variety of ways and at different rates; • learning is both an individual and a group process. The Ministry recommends that schools have a Learning Resource Committee to develop a school vision for learning resources, evaluate current school resources, establish selection priorities, evaluate resources and make recommendations for purchase, and identify learning resource management systems. A survey of Vancouver elementary and secondary schools indicates that 41% of the schools have Learning Resource Committees, but that their activities rarely include all the recommendations of the Ministry. The survey shows that only 25% of the Committees have an established procedure for selecting learning resources. This study includes an analysis of Learning Resources Committees at two secondary and one elementary school where interviews were done with administrators, teacher-librarians, teachers and staff assistants provide a picture of how learning resources are selected and managed and their impact on resource-based learning and teaching. This study found that systems for selecting and managing learning resources are in the developmental stage as teachers move from primarily print formats to a broad range of print and non-print learning resources.
A New Model for the Collective Beam-Beam Interaction
Creators: name: Ellison, J. A.
name: Sobol, A. V.
name: Vogt, M
Publisher: name: arXiv
Year: 2006
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The Collective Beam-Beam interaction is studied in the framework of maps with a ``kick-lattice'' model in the 4-D phase space of the transverse motion. A novel approach to the classical method of averaging is used to derive an approximate map which is equivalent to a flow within the averaging approximation. The flow equation is a continuous-time Vlasov equation which we call the averaged Vlasov equation, the new model of this paper. The power of this approach is evidenced by the fact that the averaged Vlasov equation has exact equilibria and the associated linearized equations have uncoupled azimuthal Fourier modes. The equation for the Fourier modes leads to a Fredholm integral equation of the third kind and the setting is ready-made for the development of a weakly nonlinear theory to study the coupling of the pi and sigma modes. The pi and sigma eigenmodes are calculated from the third kind integral equation. These results are compared with the kick-lattice model using our weighted macroparticle tracking code and a newly developed, density tracking, parallel, Perron-Frobenius code.
description: Submitted to New Journal of Physics