cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Διερεύνηση των απόψεων στελεχών στο πλαίσιο του Ευρωπαϊκού Έργου MA.R.CH
Creators: name: Παπαδημητρίου, Σοφία Θ.
name: Παπαπαναγιώτου, Γεράσιμος
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: Το έργο MA.R.CH (Making Science Real at Schools) στοχεύει στην ανάπτυξη ενός δικτύου για την προώθηση των Θετικών Επιστημών στην Ευρώπη με έμφαση στη σύνδεσή τους με την καθημερινή ζωή και την ενεργό συμμετοχή των μαθητών. Στο πλαίσιο του έργου αρχικά διερευνήθηκαν οι απόψεις εμπειρογνωμόνων και στελεχών των φορέων χάραξης πολιτικής των Θετικών Επιστημών για τις προκλήσεις, την υπάρχουσα κατάσταση, τα πλεονεκτήματα και τους προβληματισμούς τους από τη διδασκαλία των Θετικών Επιστημών στις χώρες τους. Στο άρθρο, παρουσιάζονται οι απόψεις από τις συνεντεύξεις που έγιναν στην Ελλάδα και αναδεικνύονται η αναγκαιότητα επαναπροσδιορισμού των προγραμμάτων σπουδών, των διδακτικών προσεγγίσεων και διατυπώνονται προτάσεις βιωματικής και ανακαλυπτικής/ διερευνητικής μάθησης, το μαθητο-κεντρικό μοντέλο διδασκαλίας, η ανάγκη σύνδεσης του εκπαιδευτικού περιεχομένου με την «πραγματική» ζωή και η ενσωμάτωση των μεθόδων STEM και STEAM.
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
Stability of equilibrium under constraints: Role of second-order constrained derivatives
Creators: name: Gal, Tamas
Publisher: name: arXiv
Year: 2007
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In the stability analysis of an equilibrium, given by a stationary point of a functional F[n] (free energy functional, e.g.), the second derivative of F[n] plays the essential role. If the system in equilibrium is subject to the conservation constraint of some extensive property (e.g. volume, material, or energy conservation), the Euler equation determining the stationary point corresponding to the equilibrium alters according to the method of Lagrange multipliers. Here, the question as to how the effects of constraints can be taken into account in a stability analysis based on second functional derivatives is examined. It is shown that the concept of constrained second derivatives incorporates all the effects due to constraints; therefore constrained second derivatives provide the proper tool for the stability analysis of equilibria under constraints. For a physically important type of constraints, it is demonstrated how the presented theory works. Further, the rigorous derivation of a recently obtained stability condition for a special case of equilibrium of ultrathin-film binary mixtures is given, presenting a guide for similar analyses. [For details on constrained derivatives, see also math-ph/0603027, physics/0603129, physics/0701145.]
description: 40 pages; presentation of Secs.II and IV made much clearer (both divided into two subsections), Appendix added
Radiative Losses in Plasma Accelerators
Creators: name: Kostyukov, I.
name: Nerush, E.
name: Pukhov, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We investigate the dynamics of a relativistic electron in a strongly nonlinear plasma wave in terms of classical mechanics by taking into account the action of the radiative reaction force. The two limiting cases are considered. In the first case where the energy of the accelerated electrons is low, the electron makes many betatron oscillations during the acceleration. In the second case where the energy of the accelerated electrons is high, the betatron oscillation period is longer than the electron residence time in the accelerating phase. We show that the force of radiative friction can severely limit the rate of electron acceleration in a plasma accelerator.
description: 17 pages, 5 figures
Magnetoelectric torque and edge currents in spin-orbit coupled graphene nanoribbons
Creators: name: de Sousa, Matheus S. M.
name: Sigrist, Manfred
name: Chen, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: For graphene nanoribbons with Rashba spin-orbit coupling, the peculiar magnetic response due to the presence of a magnetization and geometric confinement are analyzed within a tight-binding model. We observe a sizable transverse susceptibility that can be considered as a gate voltage-induced magnetoelectric torque without the need of a bias voltage, with different directions for zigzag and armchair ribbons. The local torque generates non-collinear spin polarization between the two edges and/or along the ribbon, and the net torque averages to zero if the magnetization is homogeneous. Nevertheless, a nonzero net torque can appear in partially magnetized nanoribbons or in nanoflakes of irregular shapes. The equilibrium spin current produced by the spin-orbit coupling also appears in nanoribbons, but the component flowing in the direction of confinement is strongly suppressed. Even without the magnetization, an out-of-plane polarized chiral edge spin current is produced, resembling that in the quantum spin Hall effect. Moreover, a magnetization pointing perpendicular to the edge produces a laminar flow of edge charge currents, whose flow direction is symmetric (non chiral) or antisymmetric (chiral) between the two edges depends on whether the magnetization points in-plane or out-of-plane.
description: 10 pages, 5 figures
Aligned or Misaligned? Student Perspectives about Team Based Learning (TBL)
Creators: name: Lin, Amy Y.
Publisher: name: University of Illinois at Chicago
Year: 2024

description: Introduction: Most studies about team-based learning (TBL) focus on whether it was better than another learning method, such as lecture, at achieving particular outcomes (e.g., exam performance, engagement in class, retention of knowledge, etc.) There is limited information on how TBL works to achieve these outcomes. This study aimed to understand how TBL works by obtaining student perspectives on how they learned in TBL.
Methods: This study used exploratory qualitative research. A total of four focus group sessions were conducted, in which each group consisted of either all first-year (M1) or all second-year (M2) medical students. Participants were asked about how they learn in TBL as compared to lectures using semi-structured interviews. Sessions were transcribed and thematic analysis of student responses was completed.
Results: A total of 21 M1 and M2 students participated in the focus groups. The overarching theme identified in their comments was misalignment, which encompassed five areas: 1) misalignment between TBLs and sequencing of the overall course; 2) misalignment between TBLs and course exams; 3) misalignment between components of TBLs; 4) misalignment between student and faculty goals of TBL and 5) misalignment between students and members of their TBL team.
Conclusion: Misalignment in the design and implementation of TBL impeded optimal learning and had larger implications for curriculum design and interpersonal relationships.
A solution for global hygienic challenges regarding the application of heater-cooler systems in cardiac surgery
Creators: name: Foltan, Maik
name: Nikisch, Andre
name: Dembianny, Jan
name: Miano, Anna-Lena
name: Heinze, Johannes
name: Klar, Dennis
name: Göbölös, Laszlo
name: Lehle, Karla
name: Schmid, Christof
Publisher: name: Universität Regensburg
Year: 2021
Subjects: subject: heater-cooler unit, Mycobacterium chimaera, cardiac surgery, extracorporeal circulation, Pseudomonas aeruginosa, Legionellae, cardiopulmonary bypass
subject: 610 Medizin

description: 71.759 surgical procedures were performed in 2019 with the aid of cardiopulmonary bypass in Germany. To adjust the patient’s body temperature on extracorporeal circulation, the application of a heater-cooler unit (HCU) is mandatory. However, in case of insufficient sanitisation of HCU, life-threatening infections can be transmitted by the device to the patients, including Legionella bacteria, Mycobacterium chimaera, Pseudomonas aeruginosa. To avoid disease transmission, as a requirement for safe medical practice established by regulatory authorities, HCUs must be regularly disinfected by hazardous chemicals posing a danger for both handling humans and the environment. Therefore, to comply with regulations, HCU manufacturers have introduced both timely and financially extensive sanitisation procedures. Our paper describes a novel, effective and easy to handle disinfection method for the above problematics without utilising hazardous chemicals. The method’s technical principle is electrolysis, resulting in drinking water quality regarding the analysed germs in the worldwide most commonly utilised heater-cooler device. The main aim of the study was to prove the efficacy and reliability of the device cleansing process. Furthermore, the economic impact of the novel method was evaluated. Therefore, we have undertaken 60 microbiological sampling series between December 2019 and November 2020 from a conventional HCU (3T LivaNova, Germany). During the total investigational period, no contamination with Pseudomonas aeruginosa or Legionellae could have been demonstrated in the HCU. The extreme slow-growing nontuberculous M. chimaera was detected only in one sample obtained from diamond electrode cleansed HCU water, and source of contamination was promptly eliminated by a simple technical modification of the device test-site. Additionally, the diamond electrode application is beneficial for eliminating potentially hazardous cleansing material from the process, which may affect otherwise both patients operated on cardiopulmonary bypass and the perfusionists.
Possible connections between whiskered categories and groupoids, many object Leibniz algebras, automorphism structures and local-to-global questions
Creators: name: Brown, Ronald
Publisher: name: arXiv
Year: 2007
Subjects: subject: Category Theory (math.CT)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 18D05, 18D10, 18G50, 55J99, 57R30

description: We define the notion of whiskered categories and groupoids, showing that whiskered groupoids have a commutator theory. So also do whiskered $R$-categories, thus answering questions of what might be `commutative versions' of these theories. We relate these ideas to the theory of Leibniz algebras, but the commutator theory here does not satisfy the Leibniz identity. We also discuss potential applications and extensions, for example to resolutions of monoids.
description: 9 pages v.2 correction made to the first definition to omit m_{1,1}. Some references modified or added v.3 considerable revision and extension of definitions and more results, including the additive case
Το μάθημα «Ευρωπαϊκός Πολιτισμός» στο γενικό λύκειο
Creators: name: Τζάμου, Αικατερίνη
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: Στο συγκεκριμένο άρθρο θα παρουσιάσουμε το σκεπτικό, τη σκοποθεσία και τους στόχους του Αναλυτικού Προγραμμάτος Σπουδών για το μάθημα επιλογής της Α΄ λυκείου «Ελληνικός και Ευρωπαϊκός Πολιτισμός» το οποίο δημοσιεύτηκε σε ΦΕΚ (ΦΕΚ αρ. 185/23-1-2015), «πάγωσε» κατά την περίοδο 2015-2019, μαζί με τα υπόλοιπα νέα ΑΠΣ που είχαν δημοσιευθεί στο ίδιο ΦΕΚ και, τελικά, δεν εφαρμόστηκε ποτέ, καθώς ο νόμος 4823/21 κατήργησε όλα τα μαθήματα επιλογής στο γενικό λύκειο. Θα διερευνήσουμε τους παράγοντες που διαμόρφωσαν την συγκεκριμένη θεματική ως διακριτό διδακτικό αντικείμενο μέσα στο πλαίσιο της Ενωμένης Ευρώπης και την εξέλιξή του στη διάρκεια των δεκαετιών, σε συσχετισμό με τις πολιτικές που διαμορφώθηκαν διεθνώς γύρω από την ευρωπαϊκή Ιδέα.
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
Και πάλι περί Διάχυσης και Αντίκτυπου των προγραμμάτων Erasmus+ ΚΑ1 και ΚΑ2: Θεωρητικά ζητήματα
Creators: name: Παπαδημητρίου, Γιώτα
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: Οι δράσεις KA1 και KA2 των προγραμμάτων Erasmus+ της Ευρωπαϊκής Ένωσης αφορούν επιμορφώσεις εκπαιδευτικών όλων των βαθμίδων σε διάφορες ευρωπαϊκές χώρες και διακρατικές στρατηγικές συμπράξεις σχολείων. Για να θεωρηθούν ολοκληρωμένες και επιτυχημένες οι ιδιαίτερα δημοφιλείς αυτές δράσεις προϋποτίθεται και απαιτείται η διάχυση και ο αντίκτυπος των σχεδίων κινητικότητας που περιλαμβάνουν. Στο παρόν κείμενο, αναπτύσσουμε θεωρητικά ζητήματα σχετικά με τα δύο αυτά βασικά ζητούμενα, τη διάχυση και τον αντίκτυπο, των προγραμμάτων Erasmus+, θέμα –παρότι πολυσυζητημένο– ελάχιστα αναπτυγμένο επιστημονικά, τουλάχιστον σε ό,τι αφορά την ελληνική πραγματικότητα. Με αυτήν την οπτική θεωρούμε ότι καταθέτουμε από αυτό εδώ το βήμα στην κρίση της επιστημονικής κοινότητας την άποψή μας, δίνοντας έτσι το έναυσμα για έναν εποικοδομητικό διάλογο πάνω σε μια θεματική που απασχολεί μεγάλη μερίδα του εκπαιδευτικού κόσμου.
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
A combination of soluble helper factors bypasses the requirement for stimulator cells and induces nonspecific cytotoxic T cell responses
Creators: name: Männel, D. N.
name: Dröge, W.
name: Falk, Werner
Publisher: name: Universität Regensburg
Year: 1985
Subjects: subject: 610 Medizin
subject: Animals
subject: Antigen-Presenting Cells/immunology
subject: Epitopes
subject: Interleukin-2/immunology
subject: Isoantigens/immunology
subject: Mice
subject: Mice, Inbred Strains
subject: T-Lymphocytes, Cytotoxic/immunology
subject: T-Lymphocytes, Helper-Inducer/immunology

description: The specificity of cytotoxic T lymphocyte (CTL) responses generated in the presence of lymphokines was studied. Thymic responder cells were activated in the presence of stimulator cells that differed in their metabolic activity. After 5 days of culture, the cytotoxic response was estimated in a 4-h 51Cr-release test. Coculture of thymic responders with irradiated splenic stimulator cells in the presence of interleukin 2(IL 2) led to preferential cytolysis of target cells that expressed the same histocompatibility antigens as the cells used for sensitization. Addition of T cell cytotoxicity-inducing factor 1 (TCF1), however, to those cultures made the presence of stimulator cells unnecessary and induced cytotoxic responses against all target cells tested, including target cells syngeneic to the responder cells. This activation was neither due to contaminating mitogen nor to the effect of heterologous serum in the assay system. The conclusion of these findings was that either polyclonal activation of CTL was induced by TCF1 or that some specific CTL clones differentiated into unrestricted killer cells under the influence of TCF1.
Towards an objective measure of speakers' intelligibility derived from the speech wave envelope
Creators: name: Hoek, Dorothy Christine
Publisher: name: University of British Columbia
Year: 2010

description: This study investigates the possibility of a relationship between amplitude modulation in the speech envelope and a speaker's intelligibility or articulatory clarity. It aims at developing an intelligibility measure called the Modulation Index (MI). Speech samples from several English speakers and one French speaker were recorded and digitized. Speakers were asked to produce speech under three articulatory conditions: Underarticulated, Normally Articulated, and Overarticulated. A computer program was developed for calculation of MI, based on the amount of amplitude modulation depth in the envelope of each digitized speech sample. The MI values so obtained were compared with the corresponding ratings from English-speaking listeners who judged the articulatory clarity of the recorded utterances. Results indicate that the relationship between the perceptual data and the Modulation Index in its present form is weak and non-monotonic. Several factors may have affected the results of the comparison between the MI values and the perceptual data. There are indications that speakers were not always successful in producing the intended articulatory conditions. Also, despite precautions, there were some differences in intensity and duration between utterances from the three conditions. It is concluded that there is some correlation between amplitude modulation in speech envelopes and speakers' intelligibility or articulatory clarity. However, the Modulation Index will require modification before it can become a useful tool. Some modifications were briefly explored, and possible further modifications to both the Modulation Index and the experimental design are suggested for future investigations.
Foreign Ownership of U.S. Agricultural Land: February 1, 1979, through December 31, 1980
Creators: name: DeBraal, J. Peter
name: Majchrowicz, T. Alexander
name: DeBraal, J. Peter
name: Majchrowicz, T. Alexander
Publisher: name: Unknown
Year: 1981
Subjects: subject: Agricultural and Food Policy
subject: Farm Management
subject: Land Economics/Use
subject: Agricultural land
subject: foreign landownership
subject: land holdings
subject: land acquisitions
subject: land dispositions

description: Foreigners owned 7.8 million acres of U.S. agricultural land as of December 31, 1980. This is 0.6 percent of all privately held agricultural land and 0.35 percent of all land in the United States. This share is too small to measure the impact on agriculture at the national level. However, some communities in areas of heaviest concentration could be adversely affected. These findings are based on an analysis of reports submitted in compliance with the Agricultural Foreign Investment Disclosure Act of 1978.
title: Besondere Bestimmungen der Prüfungsordnung für den Bachelorstudiengang Medienwissenschaften der Fakultät für Kulturwissenschaften an der Universität Paderborn
title: vom 14. Juni 2019
titleType: Subtitle
Creators: name: Universität Paderborn
Publisher: name: UB-PAD - Paderborn University Library
Year: 2019

description: Amtliche Mitteilungen / Universität Paderborn
Immersed Turnovers In Hyperbolic 3-Orbifolds
Creators: name: Rafalski, Shawn
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M50

description: We show that any immersion, which is not a covering of an embedded 2-orbifold, of a totally geodesic hyperbolic turnover in a complete orientable hyperbolic 3-orbifold is contained in a hyperbolic 3-suborbifold with totally geodesic boundary, called the "turnover core,'' whose volume is bounded from above by a function depending only on the area of the given turnover. Furthermore, we show that, for a given type of turnover, there are only finitely many possibilities for the turnover core. As a corollary, if the volume of a complete orientable hyperbolic 3-orbifold is at least 2πand if the fundamental group of the orbifold contains the fundamental group of a hyperbolic turnover (i.e., a triangle group), then the orbifold contains an embedded hyperbolic turnover.
description: 52 pages, 22 figures. Incorporates comments from the referee
Και πάλι περί Διάχυσης και Αντίκτυπου των προγραμμάτων Erasmus+ ΚΑ1 και ΚΑ2: Ευρωπαϊκές πηγές
Creators: name: Παπαδημητρίου, Γιώτα
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: Στο κείμενο που ακολουθεί παρουσιάζουμε μερικές από τις σημαντικότερες ευρωπαϊκές πηγές στις οποίες μπορεί να ανατρέξει ένας ενδιαφερόμενος, προκειμένου να αντλήσει χρήσιμες πληροφορίες σχετικά με τη διάχυση και τον αντίκτυπο των δράσεων ΚΑ1 και ΚΑ2 των προγραμμάτων Erasmus+ της Ευρωπαϊκής Ένωσης
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
Endotoxic activities of tumor necrosis factor independent of IL1 secretion by macrophages/monocytes
Creators: name: Männel, D. N.
name: Falk, Werner
name: Northoff, H.
Publisher: name: Universität Regensburg
Year: 1987
Subjects: subject: 610 Medizin
subject: Animals
subject: Cells, Cultured
subject: Endotoxins
subject: Glycoproteins/toxicity
subject: Humans
subject: Hypothermia/chemically induced
subject: Interferon-gamma/pharmacology
subject: Interleukin-1/secretion
subject: Macrophages/physiology
subject: Male
subject: Mice
subject: Mice, Inbred C3H
subject: Monocytes/physiology
subject: Recombinant Proteins/toxicity
subject: Tumor Necrosis Factor-alpha

description: Recombinant tumor necrosis factor (TNF) had hypothermic activity in vivo. Intravenous injection of TNF resulted in a hypothermic reaction of mice within 3 to 6 hours. This reaction was not the result of interleukin 1 (IL1) release from macrophages/monocytes. Peritoneal exudate cell cultures from endotoxin low responder mice or human peripheral mononuclear leukocyte cultures did not generate IL1 activity in the supernatant after exposure to TNF. The addition of interferon-gamma (IFN-gamma) or preexposure to IFN-gamma and then stimulation with TNF did also not result in IL1 secretion. No IL1 inhibitor was generated and TNF did not interfere with the IL1 test systems. Therefore, we conclude that the hypothermic activity of TNF is not mediated via the induction of IL1 production by mononuclear phagocytes.
Σύνδεση της μουσικής με την ταυτότητα του Ευρωπαίου πολίτη
Creators: name: Σκαρλάτου, Χρύσα
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: Το παρόν σενάριο διαπνέεται από την οπτική του νέου προγράμματος σπουδών (2021) του Ινστιτούτου Εκπαιδευτικής Πολιτικής για το μάθημα της μουσικής γυμνασίου και προτείνεται για την Α’ τάξη. Βασική επιδίωξη του συγκεκριμένου σεναρίου είναι να μάθουν οι μαθητές/-ήτριες τις νότες στο κλειδί του σολ από το κεντρικό ντο ως τη νότα σολ στη δεύτερη γραμμή του πενταγράμμου, μέσα από δραστηριότητες που καλλιεργούν τις μουσικές δεξιότητες, τη δημιουργικότητα και τη συνεργασία. Οι μαθητές/-ήτριες βρίσκουν ενδιαφέρουσα την σύνδεση της τέχνης με τη ζωή και με έννοιες που τους/τις αφορούν. Η σύνδεση των πέντε νοτών που αναφέρθηκαν με το χορωδιακό άσμα «Ωδή στη χαρά» («An die Freude»), που ενέταξε ο Λούντβιχ βαν Μπετόβεν (Ludwig van Beethoven) στο 4ο μέρος της 9ης Συμφωνίας του, κάνει τη συγκεκριμένη μουσική σύνθεση πιο προσιτή στους/στις μαθητές/-ήτριες. Τέλος, το γεγονός πως η μελωδία του «An die Freude» έχει επιλεχθεί να είναι και ο ύμνος της Ευρωπαϊκής Ένωσης, στην οποία ανήκει και η χώρα μας, υπενθυμίζει στους/στις μαθητές/-ήτριες το γεγονός πως φέρουν την ταυτότητα του/της Ευρωπαίου/-ας πολίτη/-ιδος, συνδέοντας αυτή την ταυτότητα τη συγκεκριμένη μελωδία. Ο σχεδιασμός του παρόντος διδακτικού σεναρίου στηρίζεται στην ενεργητική-συμμετοχική μάθηση, με αξιοποίηση της ομαδοσυνεργατικής μεθόδου, της βιωματικής προσέγγισης και του εποικοδομητικού μοντέλου διδασκαλίας. Υπηρετεί τον 1ο («Προσεγγίζω και κατανοώ τις έννοιες και τα βασικά στοιχεία της μουσικής»), τον 2ο («Γνωρίζω τα είδη της μουσικής συγχρονικά, διαχρονικά και γεωγραφικά»), τον 3ο («Συνδέω τη μουσική με άλλες τέχνες, μέσα και επιστήμες») και τον 4ο («Η μουσική εντός και εκτός σχολείου») Θεματικό Οργανωτή του Νέου Προγράμματος Σπουδών, ενώ προβλέπεται, επίσης, η ενσωμάτωση του τριπτύχου μουσικών δραστηριοτήτων (δραστηριότητες ενεργητικής ακρόασης, μουσικής δημιουργίας, φωνητικής και οργανικής εκτέλεσης). Το συγκεκριμένο σενάριο αξιοποιεί, επίσης, τις νέες τεχνολογίες για την παραγωγή μουσικών αποτελεσμάτων.
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
Zur Einführung: Das Ruhrgebiet als religiöse Landschaft
Creators: name: Hölscher, Lucian
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Zur Einführung: Das Ruhrgebiet als religiöse Landschaft" of MTS 26 (2001).
description: Moving the Social, Vol 26 (2001): Forschungen und Forschungsberichte
Consuming Cheese After Sugar Challenge Prevents Further Plaque pH Drop
Creators: name: Cortez, Kristina Elizabeth
Publisher: name: University of Illinois at Chicago
Year: 2024

description: There have been previous studies stating that drinking milk after a sugary challenge prevented in vivo dental plaque pH drop and may reduce caries risk. We hypothesized that consuming dairy products such as cheese has a similar positive effect on dental plaque pH after consuming sugary foods. This study examined the effect of chewing and consuming cheese on in vivo dental plaque pH after a sugary challenge.

 Ten adults (18-64 years) participated in this randomized controlled crossover study. Participants refrained from oral hygiene and eating the night before and morning of the testing. A base line in vivo plaque pH was first determined using a touch microelectrode at the interproximal space between the maxillary premolars (or primary molars) on both sides. The participants then consumed one of the four combinations of foods at each visit: 20 grams of dry ready-to-eat sugar added Froot Loops cereal (FL); or FL followed by low fat Swiss cheese (5g; FL/Cheese); two pieces of Haribo Gummi-Bears (FL/Gummi-Bears); or non-flavored Gum Base (FL/GB, Control) 5min after FL. A 10ml of 10% sucrose or sorbitol solution served as controls. Plaque pH were measured at 2 and 5 minutes after FL consumption and at 2 up to 30 minutes after consuming cheese, Gummi-Bears or chewing GB. There was a two-day washout between visits. SPSS version 28 and excel were used for statistical analysis.

Consumption of FL reduced plaque pH to 5.48 ± 0.42 at 15 minutes. The lowest pH value was seen in the test food group of FL/ Gummi Bear with a pH value of 5.62 ± 0.56 at the 15 minute mark. This pH value was lower when compared to the other two test food groups experienced while at their lowest pH. Gum base and cheese displayed pH values of 5.93 ± 0.57 and 6.09 ±0.58, respectively. The test food group of cheese showed the least acidic pH drop than any other food group. In fact, cheese was the most effective at reducing plaque the pH drop and was the only test food group to recover past initial baseline pH besides sorbitol control.

 Thus, chewing and consuming cheese after a sugar challenge reduced the drop in plaque pH caused by sugar consumption. Cheese, like milk, represents a healthy food and benefits human dental health if sequenced appropriately between or after sugary snacks.
title: Peddling a Distinguishable Female Form: Late Nineteenth-Century Advertising of Cosmetics Hair Products and Corsets in British Women's Magazines
Creators: name: Rhodes, Cathleen A.
Publisher: name: Old Dominion University
publisherIdentifier: https://ror.org/04zjtrb98
publisherIdentifierScheme: ROR
Year: 2007

description: This project examines advertisements for cosmetics, hair products, corsets, and various other mechanical and chemical body alteration devices to uncover an emphasis, manifested through the female body, on gendered differences. Beauty products accentuated feminine physical attributes in order to emphasize differences that were much subtler than the discourse on gender would suggest. In essence, to make the bodily difference closer to the differences the discourse on gender proclaimed.

Primary source material includes visual and textual advertisements from women's periodicals from 1870 — 1900. Periodicals have been chosen for popularity in their respective time periods as well as for their varied audiences (moderate feminists, those desiring fashion advice, and readers interested in political and social reform). This project relies heavily on ads from Woman, The Women's Penny Paper, and Myra's Journal of Dress and Fashion with occasional ads from other periodicals as well.

Secondary sources demonstrate an increasing attention to the female body as well as changes in the way that the body, both female and male, was conceptualized. This study particularly draws from the work of Thomas Laqueur who uses scientific drawings of human anatomy and writing concerned with the body and reproductive processes to identify a shift in how people thought about female and male bodies. A wide variety of scholars interested in the Victorians' use of beauty products are also consulted.
Precision polarimetry with real-time mitigation of optical-window birefringence
Creators: name: Park, B. K.
name: Sushkov, A. O.
name: Budker, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Optical-window birefringence is frequently a major obstacle in experiments measuring changes in the polarization state of light traversing a sample under investigation. It can contribute a signal indistinguishable from that due to the sample and complicate the analysis. Here, we explore a method to measure and compensate for the birefringence of an optical window using the reflection from the last optical surface before the sample. We demonstrate that this arrangement can cancel out false signals due to the optical-window birefringence-induced ellipticity drift to about 1%, for the values of total ellipticity less than 0.25 rad.
Αξιοποίηση των ευρωπαϊκών προγραμμάτων στην εκπαίδευση Παραδείγματα εφαρμογής project μέσω του προγράμματος eTwinning
Creators: name: Χριστοδούλου, Αντριανή
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: O Killpatrick, επηρεασμένος από τις παιδαγωγικές θεωρίες του Dewey, παρουσιάζει για πρώτη φορά στο έργο του «The Project Method» (1918) μια νέα για την εποχή παιδαγωγική μέθοδο, στην οποία προτείνει ουσιαστικά στους μαθητές να ανακαλύπτουν λύσεις σε προβλήματα, μαθαίνοντας από την πορεία αυτή. Σύμφωνα με τον Killpatrick, μαθαίνουμε ό,τι εφαρμόζουμε. Δε μαθαίνουμε ότι δεν εφαρμόζουμε», αναφέρει ο ίδιος στο έργο του «How we learn». Βασικές αρχές της μεθόδου είναι ο βιωματικός χαρακτήρας, η αυτενέργεια του παιδιού και η συνεργασία ανάμεσα στα παιδιά και στους εκπαιδευτικούς. Ένα τέτοιο παράδειγμα πρακτικής εφαρμογής της μεθόδου, είναι το project «Τα σχολεία χτίζουν γέφυρες φιλία», το οποίο έχει διεξαχθεί μέσω του ευρωπαϊκού προγράμματος eTwinning. Μελετήσαμε την ιστορία, τον τρόπο κατασκευής και την προσφορά των παλιών πέτρινων γεφυριών, αλλά και των σύγχρονων γεφυρών. Προσεγγίσαμε τις γέφυρες μέσω STEAM, αλλά και μάθαμε γιατί οι άνθρωποι χτίζουν γέφυρες όταν έχουμε ειρήνη και γιατί τις γκρεμίζουν κατά τη διάρκεια του πολέμου. Επίσης, μάθαμε για το ρόλο των γεφυρών στις μεταφορές και την επικοινωνία μεταξύ των ανθρώπων και την ανάπτυξη του πολιτισμού σε μια περιοχή. Τελικός στόχος μας ήταν να κάνουμε ηλεκτρονικές γέφυρες φιλίας μεταξύ των σχολείων που συμμετείχαν στο έργο. Τα συνεργαζόμενα σχολεία, αφού επικοινώνησαν μεταξύ τους, μοίρασαν αρμοδιότητες και όρισαν χρονοδιάγραμμα. Τα παιδιά κατέκτησαν τους στόχους μέσα από ατομικές και ομαδικές εργασίες που είχαν τη μορφή έρευνας. Δημιούργησαν παρουσιάσεις και αφίσες, συμμετείχαν στη συγγραφή ομαδικής ιστορίας και παραμυθιού με τα συνεργαζόμενα σχολεία, εικονογράφησαν συνεργατικό παραμύθι, δημιούργησαν βίντεο. Την τελευταία εβδομάδα, μαθητές, μαθήτριες και οι εκπαιδευτικοί προχώρησαν σε αξιολόγηση της διαδικασίας υλοποίησης του έργου και κοινοποίησαν τα συμπεράσματά τους στη σχολική κοινότητα και την τοπική κοινωνία. Στη συνέχεια θα παρουσιαστεί αυτή η προσπάθεια, αλλά και εκφράσεις της ευρωπαϊκής διάστασης στην εκπαίδευση και στον πολιτισμό
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
Efficient Divide-and-Conquer Implementations Of Symmetric FSAs
Creators: name: Pritchard, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: A deterministic finite-state automaton (FSA) is an abstract sequential machine that reads the symbols comprising an input word one at a time. An FSA is symmetric if its output is independent of the order in which the input symbols are read, i.e., if the output is invariant under permutations of the input. We show how to convert a symmetric FSA A into an automaton-like divide-and-conquer process whose intermediate results are no larger than the size of A's memory. In comparison, a similar result for general FSA's has been long known via functional composition, but entails an exponential increase in memory size. The new result has applications to parallel processing and symmetric FSA networks.
Τα «Κρυμμένα Μνημεία» Γνωρίζω και συστήνω τα «άγνωστα» μνημεία της πόλης μου Ένα eTwinning πρόγραμμα
Creators: name: Κούντη, Μαρία
name: Λαλαγιάννη, Αικατερίνη
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: Η εργασία παρουσιάζει ένα eTwinning πρόγραμμα που επικεντρώθηκε στα αφανή, στα λιγότερο γνωστά, μνημεία της πόλης της Θεσσαλονίκης. Η πόλη της Θεσσαλονίκης είναι γεμάτη μνημεία, όπως η Αγία Σοφία, ο Άγιος Δημήτριος, η Ροτόντα, η Αψίδα του Γαλερίου, ο Λευκός Πύργος, τα Βυζαντινά Τείχη και πολλά άλλα. Δίπλα, όμως, σ’ αυτούς τους «διάσημους τόπους» κρύβονται ταπεινοί και άγνωστοι ιστορικοί θησαυροί. Αυτούς τους «παραμελημένους τόπους» κλήθηκαν οι εμπλεκόμενοι μαθητές/ τριες να αναζητήσουν, να ανακαλύψουν, να γνωρίσουν βιωματικά και εμπειρικά. Κλήθηκαν, εν τέλει, ως μικροί «πρεσβευτές», να περιγράψουν, να συστήσουν και να γνωστοποιήσουν την «Άγνωστη Θεσσαλονίκη» με τα «Κρυμμένα Μνημεία» της στους συνομήλικους εταίρους τους, στους μαθητές/ τριες ενός σχολείου στην Κύπρο.
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
Genetic Improvement of Routing Protocols for Delay Tolerant Networks
Creators: name: Lorandi, Michela
name: Custode, Leonardo Lucio
name: Iacca, Giovanni
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Routing plays a fundamental role in network applications, but it is especially challenging in Delay Tolerant Networks (DTNs). These are a kind of mobile ad hoc networks made of e.g. (possibly, unmanned) vehicles and humans where, despite a lack of continuous connectivity, data must be transmitted while the network conditions change due to the nodes' mobility. In these contexts, routing is NP-hard and is usually solved by heuristic "store and forward" replication-based approaches, where multiple copies of the same message are moved and stored across nodes in the hope that at least one will reach its destination. Still, the existing routing protocols produce relatively low delivery probabilities. Here, we genetically improve two routing protocols widely adopted in DTNs, namely Epidemic and PRoPHET, in the attempt to optimize their delivery probability. First, we dissect them into their fundamental components, i.e., functionalities such as checking if a node can transfer data, or sending messages to all connections. Then, we apply Genetic Improvement (GI) to manipulate these components as terminal nodes of evolving trees. We apply this methodology, in silico, to six test cases of urban networks made of hundreds of nodes, and find that GI produces consistent gains in delivery probability in four cases. We then verify if this improvement entails a worsening of other relevant network metrics, such as latency and buffer time. Finally, we compare the logics of the best evolved protocols with those of the baseline protocols, and we discuss the generalizability of the results across test cases.
description: To be published in ACM Transactions on Evolutionary Learning and Optimization
Nonlinear Realization of the Local Conform-Affine Symmetry Group for Gravity in the Composite Fiber Bundle Formalism
Creators: name: Ali, S. A.
name: Capozziello, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A gauge theory of gravity based on a nonlinear realization (NLR) of the local Conform-Affine (CA) group of symmetry transformations is presented. The coframe fields and gauge connections of the theory are obtained. The tetrads and Lorentz group metric are used to induce a spacetime metric. The inhomogenously transforming (under the Lorentz group) connection coefficients serve as gravitational gauge potentials used to define covariant derivatives accommodating minimal coupling of matter and gauge fields. On the other hand, the tensor valued connection forms serve as auxillary dynamical fields associated with the dilation, special conformal and deformational (shear) degrees of freedom inherent in the bundle manifold. The bundle curvature of the theory is determined. Boundary topological invariants are constructed. They serve as a prototype (source free) gravitational Lagrangian. The Bianchi identities, covariant field equations and gauge currents are obtained.
description: 24 pages. to appear in IJGMMP
Το Νηπιαγωγείο ταξιδεύει στην Ευρώπη Μια συνεργατική δράση στα πλαίσια Ε-ΤWINNING
Creators: name: Κρανιά, Βάνα
name: Κωτσιοπούλου, Δήμητρα
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: Στο παρόν άρθρο παρουσιάζεται μια συνεργατική δράση μέσω του e-Twinning έργου «Preschool travelling to Europe». Το έργο υλοποιήθηκε κατά τη σχολική χρονιά 2020-2021 με μαθητές προσχολικής αγωγής. Το έργο αφορά ένα ξεχωριστό ταξίδι, όπου 4 διαφορετικά σχολεία, 14 νηπιαγωγοί και 200 παιδιά, αποφάσισαν να γίνουν συνταξιδιώτες σε ένα διαδικτυακό ταξίδι με όχημα τη φαντασία και την όμορφη διάθεση. Το πρόγραμμα ξεκίνησε αρχικά μέσω δια ζώσης διδασκαλίας τον Οκτώβρη του 2020 και συνεχίστηκε μέσω εξ αποστάσεως διδασκαλίας εξαιτίας των συνθηκών της πανδημίας. Εν τέλει, ολοκληρώθηκε μέσω δια ζώσης διδασκαλίας τον Ιούνιο του 2021. Σκοπός του προγράμματος ήταν οι μαθητές μας να συνεργαστούν, να συναισθανθούν, να βιώσουν τη χαρά της συνύπαρξης καθώς επίσης να γνωρίσουν, να εξερευνήσουν, να ανακαλύψουν μνημεία σε διάφορες Ευρωπαϊκές πόλεις, και εν τέλει να μπορέσουν να ταξιδέψουν έξω από τα φυσικά σύνορα της σχολικής τάξης με τη βοήθεια της τεχνολογίας. Ο αρχικός σχεδιασμός περιλάμβανε στρατηγικές και διδακτικά μέσα διαφοροποιημένης διδασκαλίας ο οποίος ακολουθήθηκε και στην εξ΄ αποστάσεως διδασκαλία.
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
Additional file 2 of Haplotype-resolved genomes of two buckwheat crops provide insights into their contrasted rutin concentrations and reproductive systems
Creators: name: Lin, Hao
name: Yao, Yingjun
name: Sun, Pengchuan
name: Feng, Landi
name: Wang, Shuo
name: Ren, Yumeng
name: Yu, Xi
name: Xi, Zhengxiang
name: Liu, Jianquan
Publisher: name: figshare
Year: 2023
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 2: Fig. S11. Syntenic block dotplot within F. esculentum genome. Fig. S12. Syntenic block dotplot between F. esculentum and S. oleracea genomes. Fig. S13. Gene ontology (GO) enrichment analysis of the expanded gene families in F. tataricum. Fig. S14. GO enrichment analysis of the expanded gene families in F. esculentum. Fig. S15. Overview of the rutin biosynthetic pathway in F. tataricum and F. esculentum with expression profiles of key enzyme genes. Fig. S16. Multiple sequence alignment of the UGT2 proteins for the 4 assemblies. Red box indicates the position of UDP-glycosyltransferase functional domian (PF00201). Fig. S17. Sequence alignment of UGT2 promoter sequences in F. tataricum and F. esculentum haplotyped genomes. Fig. S18. Gene collinear relationship between F. tataricum (n=8) and F. esculentum (n=8) genomes. Red lines indicate S-RNase genes loci while blue lines indicate SLF genes loci. Fig. S19 Multiple sequence alignment of the S-RNase proteins for the 2 assemblies. Fig. S20 Sequence alignment of S-RNase promoter sequences in F. tataricum and F. esculentum genomes. Fig. S21. The number of different families within the Copia (a) and Gypsy (b) superfamilies. Fig. S22. The genome comparison between the 2 Mb to 3 Mb interval of Chromosome 8 of Fe-haplotype 1 and FES_r1.0.
Evaluating Contrastive Models for Instance-based Image Retrieval
Creators: name: Krishna, Tarun
name: McGuinness, Kevin
name: O'Connor, Noel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In this work, we evaluate contrastive models for the task of image retrieval. We hypothesise that models that are learned to encode semantic similarity among instances via discriminative learning should perform well on the task of image retrieval, where relevancy is defined in terms of instances of the same object. Through our extensive evaluation, we find that representations from models trained using contrastive methods perform on-par with (and outperforms) a pre-trained supervised baseline trained on the ImageNet labels in retrieval tasks under various configurations. This is remarkable given that the contrastive models require no explicit supervision. Thus, we conclude that these models can be used to bootstrap base models to build more robust image retrieval engines.
description: Accepted In Proceedings of the 2021 International Conference on Multimedia Retrieval (ICMR 21)
«STEAM στο Θέατρο Σκιών»: Διδακτική προσέγγιση με αξιοποίηση του θεάτρου σκιών σε πρόγραμμα e-Twinning εθνικού επιπέδου
Creators: name: Μαστοράκη, Μαρία
Publisher: name: Culture - Journal of Culture in Tourism, Art & Education
Year: 2023

description: Το σύγχρονο σχολείο της συμπερίληψης και της διαπολιτισμικότητας χαρακτηρίζεται από έντονη ανομοιογένεια που εξαρτάται τόσο από την πολιτισμική προέλευση (διαφορετική μητρική γλώσσα, διαφορετική κουλτούρα) όσο και από τις μαθησιακές ανάγκες των μαθητών (μαθησιακή ετοιμότητα, ρυθμός και στυλ μάθησης, ενδιαφέροντα των μαθητών). Γι’ αυτό θα πρέπει να αποτελεί ένα ελκυστικό περιβάλλον μάθησης για όλους τους μαθητές με στόχο τη δημιουργία μελλοντικών ενεργών πολιτών που θα είναι σε θέση να επιλύουν προβλήματα έχοντας αναπτύξει κριτική σκέψη και δεξιότητες συνεργασίας, αποδοχής και διαχείρισης κρίσεων. Σκοπός της παρούσας διδακτικής πρότασης είναι η παρουσίαση μιας διαφοροποιημένης-διαθεματικής διδασκαλίας με αξιοποίηση του Θεάτρου Σκιών σε ένα πρόγραμμα e-Twinning εθνικού επιπέδου εντάσσοντας το στο αναλυτικό ωρολόγιο πρόγραμμα. Η πολυσύνθετη, πολυδιάστατη και πολύπλοκη φύση της τέχνης του Θεάτρου Σκιών έχει τη δυνατότητα να εντάξει μια πληθώρα θεματικών ενοτήτων καλύπτοντας ένα ευρύ φάσμα μαθημάτων, αναδεικνύοντας τη διαθεματική και διεπιστημονική ταυτότητα της. Μέσα από τη διαθεματική αυτή προσέγγιση οι μαθητές απέκτησαν σφαιρική αντίληψη της γνώσης, ήρθαν σε επαφή με τις νέες τεχνολογίες, εκπαιδεύτηκαν σε ψηφιακά εργαλεία και ανέπτυξαν ποικίλες δεξιότητες και στοιχεία της προσωπικότητας τους εργαζόμενοι ατομικά αλλά και σε ομάδες ενδοσχολικές και διασχολικές. Αποτέλεσμα αυτής της προσέγγισης ήταν η παρουσίαση μιας παράστασης Θεάτρου Σκιών (crankie shadow theatre) από τους μαθητές, στην οποία ενσωμάτωσαν την τεχνολογία (λειτουργία με τη βοήθεια του μικροελεγκτή arduino).
description: Culture - Journal of Culture in Tourism, Art & Education, Τόμ. 3, Αρ. 3 (2023): Culture
Konfessionelle Mischehen im Ruhrgebiet
Creators: name: Bendikowski, Tillmann
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Konfessionelle Mischehen im Ruhrgebiet" of MTS 26 (2001).
description: Moving the Social, Vol 26 (2001): Forschungen und Forschungsberichte
"Gründerväter - Bürokraten - Akademiker": Zur Rekrutierung des gewerkschaftlichen Führungspersonals: Einleitung
Creators: name: Schulze, Rainer
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "'Gründerväter - Bürokraten - Akademiker': Zur Rekrutierung des gewerkschaftlichen Führungspersonals: Einleitung" of MTS 9 (1990).
description: Moving the Social, Vol 9 (1990): "Gründerväter - Bürokraten - Akademiker". Zur Rekrutierung des gewerkschaftlichen Führungspersonals
Faster Distributed Graph Algorithms via Continuous Optimization Methods
Creators: name: Ye, Mingquan
Publisher: name: University of Illinois at Chicago
Year: 2024

description: Graph problems have been widely researched and possess a broad class of applications. The increasing large-scale graphs in various applications have necessitated the development of distributed algorithms. Inspired by the successful applications of continuous optimization methods in improving some combinatorial optimization problems, we adapt the sequential optimization approaches to distributed settings and enhance the current distributed graph problems. As a foundational component of these work, the Laplacian solver plays a vital role. Although the Laplacian solver has undergone comprehensive investigation in both sequential and parallel models, it remains open how to design an efficient distributed Laplacian solver. In this thesis, we close this gap by extending Laplacian paradigm to distributed settings. Firstly, we employ preconditioned conjugate gradient method, and combine a distributed spectral approximation algorithm with a distributed Laplacian solver developed for sparse graphs, achieving an ${O}(n^{1/4 + o(1)} (\sqrt{n} + D))$-round algorithm in the \congest model, where $n$ and $D$ are the number of vertices and the diameter of the communication network, respectively. Then we further improve the round complexity to $O(n^{o(1)} (\sqrt{n}+D))$, which almost matches its lower bound $\wt{\Omega}(\sqrt{n}+D)$, by combining the developed distributed spectral subspace sparsifier with both tree and elimination-based preconditioners. Armed with the distributed Laplacian solver, we obtain the first exact sublinear-round distributed algorithms for maximum flow, min-cost flow, and single-source shortest path (SSSP) on sparse graphs by simulating the existingly sequential algorithms.

The distributed algorithms we have developed above are designed for worst-case scenarios which correspond to a family of pathological networks. However, it is important to note that these worst-case conditions may not be applicable to the majority of networks encountered in practice. As a result, we employ an alternative concept to quantify the round complexity, namely, the optimal round complexity of the correct algorithms on graph $G$. We illustrate the SSSP problem as a concrete example. Our primary technique involves using low-diameter decompositions to construct the first efficient $n^{o(1)}$-competitive linear $\ell_1$-oblivious routing operator, which is much simpler than existing methods. Then combining this $\ell_1$-oblivious routing with boosting property for transshipment, we give the first universally-optimal distributed algorithm for $(1 + \eps)$-approximate SSSP.
Position and velocity space diffusion of test particles in stochastic electromagnetic fields
Creators: name: Perri, Silvia
name: Lepreti, Fabio
name: Carbone, Vincenzo
name: Vulpiani, Angelo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The two--dimensional diffusive dynamics of test particles in a random electromagnetic field is studied. The synthetic electromagnetic fluctuations are generated through randomly placed magnetised ``clouds'' oscillating with a frequency $ω$. We investigate the mean square displacements of particles in both position and velocity spaces. As $ω$ increases the particles undergo standard (Brownian--like) motion, anomalous diffusion and ballistic motion in position space. Although in general the diffusion properties in velocity space are not trivially related to those in position space, we find that energization is present only when particles display anomalous diffusion in position space. The anomalous character of the diffusion is only in the non--standard values of the scaling exponents while the process is Gaussian.
description: 10 pages, 4 figures