cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Comparison of cosmic string and superstring models to NANOGrav 12.5-year results
Creators: name: Blanco-Pillado, Jose J.
name: Olum, Ken D.
name: Wachter, Jeremy M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compare the spectrum of the stochastic gravitational wave background produced in several models of cosmic strings with the common-spectrum process recently reported by NANOGrav. We discuss theoretical uncertainties in computing such a background, and show that despite such uncertainties, cosmic strings remain a good explanation for the potential signal, but the consequences for cosmic string parameters depend on the model. Superstrings could also explain the signal, but only in a restricted parameter space where their network behavior is effectively identical to that of ordinary cosmic strings.
description: 15 pages, RevTex
The effects of carbachol on cAMP and protein kinase A activity in rat ventricles
Creators: name: Zhang, Jack Zhen
Publisher: name: University of British Columbia
Year: 2009

description: It has been shown that (CCH) antagonizes the positive inotropic response to forskolin (FSK) in rabbit ventricles without decreasing total cAMP levels elevated by FSK. Further reports proposed that only cAMP (Cyclic AMP) in the particulate fraction of myocardium determines the inotropic state and Ca2+ transients of the cell in the presence of cAMP elevating agents. In this investigation, we studied the effects of CCH on compartmental cAMP and PKA (protein kinase A) activity changed by cAMP-generating agents in rat ventricles. The elevation of particulate cAMP content was correlated with the LVP (left ventricle pressure) increased by isoproterenol (ISO) (10-7 M), and FSK (10-6 M) (r=0.90). Although PGE1 (prostaglandin E-\, 3x10-5 M) increased the total cAMP content and soluble PKA activity, it neither significantly affected the particulate cAMP content and PKA activity nor the LVP. Pre-perfusion with CCH (3x10-6 M) for 1 min, in addition to antagonizing the LVP elevated by ISO (122.8 ± 12.4 to 60.3 ± 8.4 mm Hg), decreased the total and particulate cAMP (26.8 ± 1.3 to 18.2 ± 1.6 and 16.4 ± 1.2 to 12.1 ± 0.8 pmol/mg protein respectively), lowered the soluble PKA ratio (0.60 ± 0.02 to 0.42 ± 0.03) and increased the percentage of particulate PKA (19.46 ±1.15 to 26.22 ± 0.54 %). CCH had no effect on either total and particulate cAMP levels or soluble and particulate PKA activity in the presence of FSK although the positive inotropic response to FSK was abolished by CCH (93.1 ±8.1 to 54.2 ± 8.5 mm Hg). The results support the hypothesis that particulate cAMP and PKA may determine the inotropic state of myocardium after cAMP-generating agent stimulation. However, the ability of CCH to antagonize the positive inotropic effect of FSK does not appear to be associated with a reduction in particulate cAMP or PKA activity.
Data-driven methodologies for cuff-less blood pressure estimation
Creators: name: Wang, Weinan
Publisher: name: No Publisher Supplied
Year: 2021

description: Cuff-less blood pressure (BP) estimation methods are the highly-desired replacement for conventional cuff-based methods, as they enable long-term and continuous monitoring of the BP with limited disturbance or need for manual operation. Cuff-less BP estimation methods can be generally classified into model-driven and data-driven methods. Both methods often utilize photoplethysmogram (PPG) or electrocardiogram (ECG), which can be continuously and non-invasively acquired. Model-driven methods are based on the pulse wave transition theory, which relates the pulse transit time (PTT) to the blood pressure. An advantage that model-driven methods offer is that very few parameters have to be learned from the training set, thereby, making them efficient and computationally inexpensive. However, these methods require individual calibration, their accuracy decreases over time, and they generally require recordings of both ECG and PPG, which is hard to maintain over long periods. On the other hand, in data-driven methods, the need for subject-specific calibration and the requirement of using two or more physiological recordings are released. However, these methods typically require high computational budget and massive training datasets for learning a much larger quantity of parameters.In this thesis, we first provide a comprehensive review of seven models that have been utilized in model-driven BP estimation methods, and discuss their advantages and limitations. We then present an overview of existing data-driven methods that have used ECG alone, PPG alone, or both signals for BP estimation. Motivated by the notable performance of PPG-based data-driven BP estimation methods, we then present a novel transfer learning-based blood pressure estimation algorithm that utilizes visibility graph to form images from PPG recordings. The proposed method provides accurate BP estimation with only one PPG beat, while being computationally efficient requiring training of only one dense layer. Experimental results demonstrate that the proposed method offers comparable or better BP estimation accuracy compared to other data-driven methods with higher computational complexity, making it a suitable candidate for continuous BP monitoring applications.
Veranstaltungen
Creators: name: IZGOnZeit, Redaktion
Publisher: name: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG)
Year: 2009

description: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG), IFFOnZeit Nr. 1 (2009)
New Ekpyrotic Cosmology
Creators: name: Buchbinder, Evgeny I.
name: Khoury, Justin
name: Ovrut, Burt A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, we present a new scenario of the early Universe that contains a pre big bang Ekpyrotic phase. By combining this with a ghost condensate, the theory explicitly violates the null energy condition without developing any ghost-like instabilities. Thus the contracting universe goes through a non-singular bounce and evolves smoothly into the expanding post big bang phase. The curvature perturbation acquires a scale-invariant spectrum well before the bounce in this scenario. It is sourced by the scale-invariant entropy perturbation engendered by two ekpyrotic scalar fields, a mechanism recently proposed by Lehners et al. Since the background geometry is non-singular at all times, the curvature perturbation remains nearly constant on super horizon scales. It emerges from the bounce unscathed and imprints a scale-invariant spectrum of density fluctuations in the matter-radiation fluid at the onset of the hot big bang phase. The ekpyrotic potential can be chosen so that the spectrum has a ``red'' tilt, in accordance with the recent data from WMAP. As in the original Ekpyrotic scenario, the model predicts a negligible gravity wave signal on all observable scales. As such ``New Ekpyrotic Cosmology" provides a consistent and distinguishable alternative to inflation to account for the origin of the seeds of large scale structure.
description: 41 pages, 4 figures. v2: minor corrections, references added. v3: small modifications in bounce section, references added. v4: version published in PRD
Neuerscheinungen
Creators: name: IZGOnZeit, Redaktion
Publisher: name: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG)
Year: 2009

description: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG), IFFOnZeit Nr. 1 (2009)
Ευστοχία ρίψης και ισομετρική σταθερότητα των καμπτήρων μυών του καρπού
Creators: name: Γηρούση, Φωτεινή Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ευστοχία ρίψης
Ισομετρική σταθερότητα
Καμπτήρες του καρπού
Throwing accuracy
Isometric force
Wrist flexors

description: Ο σκοπός της έρευνας ήταν να μελετήσει τη σχέση μεταξύ της ευστοχίας κατά τη ρίψη, που εκτελείται αποκλειστικά από τους καμπτήρες του καρπού, και της σταθερής εφαρμογής ισομετρικής δύναμης από τους ίδιους μύες στην ίδια θέση. Δεκαοκτώ απροπόνητοι νέοι και νέες εκτέλεσαν 100 βολές (10 σετ από 10 βολές) ο καθένας σε ειδικά κατασκευασμένο στόχο. Οι ίδιοι νέοι εκτέλεσαν υπομέγιστες ισομετρικές συστολές των καμπτήρων του καρπού στο 5, 10, 20, 35 και 50% της Μέγιστης Εκούσιας Συστολής (ΜΕΣ) από την ίδια θέση. Αξιολογήθηκε η ευστοχία, η ισομετρική σταθερότητα και καταγράφηκε η ηλεκτρομυογραφική δραστηριότητα του αγωνιστή Ωλένιου Καμπτήρα του Καρπού (ΩΚΚ), του ανταγωνιστή Κοινού Εκτείνοντα των Δακτύλων (ΚΕΔ) και του σταθεροποιητή Δελτοειδή (ΔΕΛ) κατά τη διάρκεια των βολών και των ισομετρικών συστολών. Η ανάλυση ανέδειξε ότι δεν υπήρξε καμία συσχέτιση μεταξύ της ευστοχίας και της σταθερής εφαρμογής δύναμης. Αναπάντεχα όμως, ανέδειξε μια διαφορά στην έναρξη της ενεργοποίησης του ΩΚΚ κατά την εκτέλεση των εύστοχων βολών σε σχέση με τις άστοχες, αποτέλεσμα που δείχνει σημαντικά μικρότερη διάρκεια ενεργοποίησης του αγωνιστή μυός κατά τις εύστοχες βολές. Το τελικό συμπέρασμα της μελέτης είναι ότι η ευστοχία κατά τη ρίψη, που οφείλεται αποκλειστικά στη σύγκεντρη λετουργία των καμπτήρων μυών του καρπού, δεν σχετίζεται με την ισομετρική σταθερότητα των μυών αυτών. Η επονομαζόμενη «αργοπορημένη ενεργοποίηση» των αγωνιστών, που χαρακτηρίζει τις εύστοχες βολές, μοιάζει να επιβεβαιώνει τη σημαντικότητά της.
description: The aim of this research was to evaluate the relationship between throwing accuracy involving only the wrist flexors and a higher ability to sustain a constant application of force from the same muscles at the same position. Eighteen sedentary young adults performed 100 throwing trials (10 sets of 10 throws) on a specific target. They also performed submaximal isometric wrist flexions at 5, 10, 20, 35 and 50% of MVC on the same position. The throwing accuracy and the isometric force were assessed and the electromyographic (EMG) activation of the agonist Flexor Carpi Ulnaris (FCU), antagonist Extensor Digitorum (ED) and Deltoid (DEL) muscle was recorded during both throws and isometric actions. Analysis showed no correlation between the accuracy scores and the steadiness during isometric actions. However, a difference in activation onset for FCU during the accurate throws compared to the non-accurate was observed. These results indicate a significant shorter muscle activation of agonist during accurate throws. It is concluded that throwing accuracy, originated from concentric action of wrist flexors, is not associated with isometric steadiness. The so-called “late activation” pattern characterising accurate throws is requested.
Homogeneity in generalized function algebras
Creators: name: Hanel, Clemens
name: Mayerhofer, Eberhard
name: Pilipovic, Stevan
name: Vernaeve, Hans
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 46F30

description: We investigate homogeneity in the special Colombeau algebra. It is shown that strongly scaling invariant functions on the d-dimensional space are simply the constants. On the pierced space, strongly homogeneous functions admit tempered representatives, whereas on the whole space, such functions are polynomials with generalized coefficients. We also introduce weak notions of homogeneity and show that these are consistent with the classical notion on the distributional level. Moreover, we investigate the relation between generalized solutions of the Euler differential equation and homogeneity.
description: 24 pages, reorganized, extended introduction
Early Gas Stripping as the Origin of the Darkest Galaxies in the Universe
Creators: name: Mayer, Lucio
name: Kazantzidis, Stelios
name: Mastropietro, Chiara
name: Wadsley, James
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The known galaxies most dominated by dark matter (Draco, Ursa Minor and Andromeda IX) are satellites of the Milky Way and the Andromeda galaxies. They are members of a class of faint galaxies, devoid of gas, known as dwarf spheroidals, and have by far the highest ratio of dark to luminous matter. None of the models proposed to unravel their origin can simultaneously explain their exceptional dark matter content and their proximity to a much larger galaxy. Here we report simulations showing that the progenitors of these galaxies were probably gas-dominated dwarf galaxies that became satellites of a larger galaxy earlier than the other dwarf spheroidals. We find that a combination of tidal shocks and ram pressure swept away the entire gas content of such progenitors about ten billion years ago because heating by the cosmic ultraviolet background kept the gas loosely bound: a tiny stellar component embedded in a relatively massive dark halo survived until today. All luminous galaxies should be surrounded by a few extremely dark-matter-dominated dwarf spheroidal satellites, and these should have the shortest orbital periods among dwarf spheroidals because they were accreted early.
description: Published in Nature (15 February 2007), 28 pages, 8 figures, Supplementary Information included
Verschiedenes
Creators: name: IZGOnZeit, Redaktion
Publisher: name: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG)
Year: 2009

description: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG), IFFOnZeit Nr. 1 (2009)
Η χρήση της πλατφόρμας MOODLE για την υποστήριξη της διδασκαλίας της Ισπανικής γλώσσας στην Α΄ τάξη γυμνασίου
Creators: name: Τζαφέρη, Ευφραξία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Moodle
Μοντέλο Μικτής Ενσωμάτωσης
Ισπανικά
Blended learning
Spanish

description: Η εκπαίδευση, στις μέρες μας, διανύει της εποχή της Τεχνολογίας της Πληροφορίας. Ο παράγοντας αυτός συνετέλεσε στην αλλαγή του παραδοσιακού μοντέλου της διδασκαλίας και την εισαγωγή της online εκπαίδευσης στη σύγχρονη διδασκαλία. Η μεγάλη απήχηση της Ισπανικής και Λατινοαμερικάνικης Κουλτούρας στην Ελλάδα του σήμερα, αλλά και η εισαγωγή της διδασκαλίας της Ισπανικής στην δευτεροβάθμια δημιούργησε την ανάγκη προσαρμογής αντίστοιχου εκπαιδευτικού υλικού στην ψηφιακή τεχνολογία. Στην εργασία αυτή παρουσιάζονται δεδομένα που αφορούν την εκμάθηση της Ισπανικής γλώσσας στην Ελλάδα, και γίνεται αναφορά στην online εκπαίδευση και, ειδικότερα στα Συστήματα Διαχείρισης Μάθησης. Καθώς η εκπαιδευτική πλατφόρμα Moodle αποτελεί αναμφισβήτητα ένα δυνατό εργαλείο στα χέρια του εκπαιδευτικού, προτείνεται ένας τρόπος αξιοποίησής της, ως εργαλείο διδασκαλίας ξένων γλωσσών. Στην εργασία προτείνεται ένα μάθημα ισπανικής, με εκπαιδευτικό – ενισχυτικό υλικό για το επίπεδο της Α’ Γυμνασίου.
description: Nowadays, education is characterized as a part of the era of The technology of Information. This factor played a crucial role in the modification of the traditional model of construction and the incorporation of on-line education in the modern way of teaching. The perennial appeal that Spanish and Latin culture have on Greece these days in association with the integration of Spanish as a teaching language in the secondary education provoked to customize the tutorial in the digital technology. The particular project aims to present data that concern to the teaching of Spanish in Greece and refer to the on-line education and mostly in Learning Management Systems. Since Moodle as a learning platform forms a drastic tool for teacher, it is proposed a way of optimizing it in the construction of foreign languages. This project suggests a lesson of Spanish with activities for reinforcement addressing to the students of the first class of high school.
The multi-phase gaseous halos of star forming late-type galaxies - II. Statistical analysis of key parameters
Creators: name: Tuellmann, R.
name: Breitschwerdt, D.
name: Rossa, J.
name: Pietsch, W.
name: Dettmar, R. -J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In Paper I we showed that multi-phase gaseous halos of late-type spiral galaxies, detected in the radio continuum, in Halpha, and in X-rays, are remarkably well correlated regarding their morphology and spatial extent. In this work we present new results from a statistical analysis in order to specify and quantify these phenomenological relations. This is accomplished by investigating soft X-ray (0.3-2.0keV) luminosities, FIR, radio continuum, Halpha, B-band, and UV luminosities for a sample of 23 edge-on late-type spiral galaxies. Typical star formation indicators, such as SFRs, are determined and a statistical correlation analysis is carried out. We find strong linear correlations, covering at least two orders of magnitude, between star formation indicators and integrated (disk+halo) luminosities in all covered wavebands. In addition to the well established L_FIR/L_1.4GHz-relation, we show new and highly significant linear dependencies between integrated soft X-ray luminosities and FIR, radio continuum, Halpha, B-band, and UV luminosities. Moreover, integrated soft X-ray luminosities correlate well with SFRs and the energy input into the ISM by SNe. The same holds if these quantities are plotted against soft halo X-ray luminosities. Only a weak correlation exists between the dust mass of a galaxy and the corresponding X-ray luminosity. Among soft X-ray luminosities, baryonic, and HI-gas masses, no significant correlations are found. There seems to exist a critical input energy by SNe into the ISM or a SFR threshold for multi-phase halos to show up. It is still not clear whether this threshold is a physical or an instrument dependent sensitivity limit. These findings strongly support our previous results, but conflict with the concept of halos being due to infalling gas from the IGM.
description: 8 pages, 3 figures, 1 table, accepted for publication in A&A
Non-local amplification of intense vorticity in turbulent flows
Creators: name: Buaria, Dhawal
name: Pumir, Alain
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The nonlinear and nonlocal coupling of vorticity and strain-rate constitutes a major hindrance in understanding the self-amplification of velocity gradients in turbulent fluid flows. Utilizing highly-resolved direct numerical simulations of isotropic turbulence in periodic domains of up to $12288^3$ grid points, and Taylor-scale Reynolds number $R_λ$ in the range $140-1300$, we investigate this non-locality by decomposing the strain-rate tensor into local and non-local contributions obtained through Biot-Savart integration of vorticity in a sphere of radius $R$. We find that vorticity is predominantly amplified by the non-local strain coming beyond a characteristic scale size, which varies as a simple power-law of vorticity magnitude. The underlying dynamics preferentially align vorticity with the most extensive eigenvector of non-local strain. The remaining local strain aligns vorticity with the intermediate eigenvector and does not contribute significantly to amplification; instead it surprisingly attenuates intense vorticity, leading to breakdown of the observed power-law and ultimately also the scale-invariance of vorticity amplification, with important implications for prevailing intermittency theories.
description: 6 pages, 6 figures
Η άμεση επίδραση των στατικών και δυναμικών διατάσεων στη δρομική ταχύτητα και στο κάθετο άλμα εφήβων καλαθοσφαιριστών
Creators: name: Κούρτης – Δουλκερίδης, Αθανάσιος
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Στατικές διατάσεις
Δυναμικές διατάσεις
Καλαθοσφαιριστές
Static stretching
Dynamic stretching
Basketball players

description: Σκοπός της παρούσας έρευνας ήταν να εξεταστεί η άμεση επίδραση των στατικών και δυναμικών διατάσεων, καθώς και ο ρυθμός εκτέλεσης αυτών, στο κατακόρυφο άλμα και τη δρομική ταχύτητα εφήβων καλαθοσφαιριστών. Στην έρευνα συμμετείχαν δεκαπέντε έφηβοι καλαθοσφαιριστές (n=15) ηλικίας (μέση τιμή 13,4 ± 0,5 έτη), ακολουθώντας γενική προθέρμανση έξι λεπτών και τρία πρωτόκολλα διατάσεων για κάθε μυ διάρκειας τριάντα δευτερολέπτων (3x10΄΄) στατικών διατάσεων (ΣΣ), δυναμικών με αργό ρυθμό εκτέλεσης (ΔΔ - 50 χτύποι μετρονόμου/λεπτό) και δυναμικών με γρήγορο ρυθμό εκτέλεσης (Βαλλιστικές – BB - 100 χτύποι μετρονόμου/λεπτό), με τυχαία σειρά σε τρείς διαφορετικές ημέρες που απείχαν μεταξύ τους μία εβδομάδα. Ακολούθως, οι αθλητές αξιολογήθηκαν στο κατακόρυφο άλμα με αιώρηση των χεριών και στη δρομική ταχύτητα 20 μ.. Η ανάλυση διακύμανσης (One Way Anova) έδειξε στατιστικά σημαντικά καλύτερες τιμές στο ύψος του κατακόρυφου άλματος και στη δρομική ταχύτητα μετά από την εφαρμογή των ΔΔ (p=0.047) και ΒΒ (p=0.018) συγκριτικά με τις ΣΣ. Συμπερασματικά, οι αθλητές και προπονητές είναι προτιμότερο να συμπεριλαμβάνουν στην προθέρμανση τους δυναμικού τύπου διατατικές ασκήσεις, όταν ακολουθούν δραστηριότητες ισχύος.
description: The purpose of the present study was to examine the acute effects of static and dynamic stretching, and their different stretching velocities on vertical jump and sprint performance in adolescent basketball players. Fifteen males (n=15) (aged mean 13,4±0,5 years) performed six minutes general warm-up followed by three stretching protocols (3x10΄΄) for every muscle, static stretching (SS), slow dynamic stretching (DD - 50 b/min) and fast dynamic stretching (Ballistic – BB - 100 b/min) which performed in random order and completed in three different days with one week rest between each measure. Post-warm-up sprint and countermovement jump were performed. One Way Anova indicated significantly greater jump height and sprinting performance after DD (p=0.047) and BB (p=0.018) compared to SS. In conclusion, athletes and coaches may be better to include in warm up dynamic stretching exercises before activities that require high levels of force.
The ACS Virgo Cluster Survey. XII. The Luminosity Function of Globular Clusters in Early Type Galaxies
Creators: name: Jordan, Andres
name: McLaughlin, Dean E.
name: Cote, Patrick
name: Ferrarese, Laura
name: Peng, Eric W.
name: Mei, Simona
name: Villegas, Daniela
name: Merritt, David
name: Tonry, John L.
name: West, Michael J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze the luminosity function of the globular clusters (GCs) belonging to the early-type galaxies observed in the ACS Virgo Cluster Survey. We have obtained estimates for a Gaussian representation of the GC luminosity function (GCLF) for 89 galaxies. We have also fit the GCLFs with an "evolved Schechter function", which is meant to reflect the preferential depletion of low-mass GCs, primarily by evaporation due to two-body relaxation, from an initial Schechter mass function similar to that of young massive clusters. We find a significant trend of the GCLF dispersion with galaxy luminosity, in the sense that smaller galaxies have narrower GCLFs. We show that this narrowing of the GCLF in a Gaussian description is driven by a steepening of the GC mass function above the turnover mass, as one moves to smaller host galaxies. We argue that this behavior at the high-mass end of the GC mass function is most likely a consequence of systematic variations of the initial cluster mass function. The GCLF turnover mass M_TO is roughly constant, at ~ 2.2 x 10^5 M_sun in bright galaxies, but it decreases slightly in dwarfs with M_B >~ -18. We show that part of the variation could arise from the shorter dynamical friction timescales in smaller galaxies. We probe the variation of the GCLF to projected galactocentric radii of 20-35 kpc in the Virgo giants M49 and M87, finding that M_TO is essentially constant over these spatial scales. Our fits of evolved Schechter functions imply average dynamical mass losses (Delta) over a Hubble time that fall in the range 2 x 10^5
description: 46 pages, 20 figures, 6 tables. Accepted for publication in ApJS. Also available at http://www1.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/community/ACSVCS/publications.html
General dispersion properties of magnetized plasmas with drifting bi-Kappa distributions. DIS-K: DIspersion Solver for Kappa plasmas
Creators: name: López, R. A.
name: Shaaban, S. M.
name: Lazar, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Space plasmas are known to be out of (local) thermodynamic equilibrium, as observations show direct or indirect evidences of non-thermal velocity distributions of plasma particles. Prominent are the anisotropies relative to the magnetic field, anisotropic temperatures, field-aligned beams or drifting populations, but also, the suprathermal populations enhancing the high-energy tails of the observed distributions. Drifting bi-Kappa distribution functions can provide a good representation of these features and enable for a kinetic fundamental description of the dispersion and stability of these collision-poor plasmas, where particle-particle collisions are rare but wave-particle interactions appears to play a dominant role in the dynamic. In the present paper we derive the full set of components of the dispersion tensor for magnetized plasma populations modeled by drifting bi-Kappa distributions. A new solver called DIS-K (DIspersion Solver for Kappa plasmas) is proposed to solve numerically the dispersion relations of high complexity. The solver is validated by comparing to the damped and unstable wave solutions obtained with other codes, operating in the limits of drifting Maxwellian and non-drifting Kappa models. These new theoretical tools enable more realistic characterizations, both analytical and numerical, of wave fluctuations and instabilities in complex kinetic configurations measured in-situ in space plasmas.
description: Accepted for publication in Journal of Plasma Physics
Μελέτη της οξείδωσης του αντιβιοτικού σουλφαμεθοξαζόλη σε πρότυπο ηλεκτροχημικό κελί Electro – Fenton
Creators: name: Χατζής, Βασίλειος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Προηγμένες Ηλεκτροχημικές Μέθοδοι Οξείδωσης
Διεργασία Electro – Fenton
Σουλφαμεθοξαζόλη
Electrochemical Advanced Oxidation Processes
Electro – Fenton Process
Sulfamethoxazole

description: Αντικείμενο της εργασίας είναι η βελτιστοποίηση της απόδοσης ενός πρότυπου ηλεκτροχημικού κελιού ως προς τη συνεχή και επιτόπια παραγωγή υπεροξειδίου του υδρογόνου [H2O2] με σκοπό την αποτελεσματική απομάκρυνση από το πόσιμο νερό των οργανικών μικρορύπων που μπορεί να ενέχουν σημαντικές επιπτώσεις για την ανθρώπινη υγεία, μέσω αντιδράσεων Fenton. Σε πιλοτικές δοκιμές με κελί αποτελούμενου από τρία ζεύγη ηλεκτροδίων τσόχας άνθρακα, συνολικής μάζας 4.5 g και ενεργού όγκου ~ 49 cm3, προσδιορίστηκε παραγωγή ~ 1900 μg/L Η2Ο2 σε μόνιμες συνθήκες συνεχούς λειτουργίας, κατά την εφαρμογή τάσης 1.70 Volt και παροχή νερού βρύσης 100 mL/min. Πειράματα με το αντιβιοτικό σουλφαμεθοξαζόλη (SMX), σε βέλτιστες συνθήκες λειτουργίας του κελιού, οδήγησαν αρχικά σε ταχεία ρόφηση της ουσίας στα ηλεκτρόδια άνθρακα του κελιού (~ 96 % στα πρώτα 20 min). Επακολούθησε οξείδωση του προσροφημένου SMX από τα οξειδωτικά μέσα που παρήχθησαν κατά την αντίδραση του Η2Ο2 με τα ενσωματωμένα στα ηλεκτρόδια της καθόδου καταλυτικά νανοσωματίδια σιδήρου [Fe3O4] (αντιδράσεις τύπου Fenton). Από αναλύσεις LC/MS προσδιορίστηκαν παραπροϊόντα οξείδωσης του SMX, τα οποία επέτρεψαν τεκμηριωμένες εκτιμήσεις του μηχανισμού οξείδωσης του SMX στο προαναφερόμενο κελί Electro – Fenton.
description: This study aims at optimizing the operational efficiency of a novel electrochemical cell/device for the in-situ production of hydrogen peroxide and the successful elimination of organic micropollutants from drinking water sources by Fenton reactions. Pilot studies with a cell comprising three pairs of carbon-felt electrodes, of total mass 4.5 g and effective cell volume of ~ 49 cm3, led to the in-situ electrosynthesis of ~ 1900 μg/L H2O2 under the following optimal conditions: 1.70 Volt and 100 mL/min of applied electric potential and feed flow rate, respectively. Under these conditions, the electro-Fenton cell exhibited a rapid removal of the antibiotic sulfamethoxazole (SMX) due to sorption on the carbon electrodes (~ 96 % within the first 20 min), followed by oxidation reactions between the adsorbed SMX and the oxidants formed during the Fenton reactions in the cell (i.e. reaction of the produced H2O2 with the impregnated with iron nanoparticles-Fe3O4 cathodes). LC/MS analyses revealed the formation of SMX transformation products which in turn allowed the determination of a tentative transformation pathway.
Como os bixos cantavam
Creators: name: Mỹky, Kiwuxi
name: Rondon Amarante, Elizabeth
name: Bardagil Mas, Bernat
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2024
Subjects: subject: irn

description: 2 arquivos WAV. Lado B: canções de crianças, aos 16:20 história não identificada. Digitalizado pela pesquisadora no Brasil.
Bulk geometry in gauge/gravity duality and color degrees of freedom
Creators: name: Hanada, Masanori
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: U($N$) supersymmetric Yang-Mills theory naturally appears as the low-energy effective theory of a system of $N$ D-branes and open strings between them. Transverse spatial directions emerge from scalar fields, which are $N\times N$ matrices with color indices; roughly speaking, the eigenvalues are the locations of D-branes. In the past, it was argued that this simple 'emergent space' picture cannot be used in the context of gauge/gravity duality, because the ground-state wave function delocalizes at large $N$, leading to a conflict with the locality in the bulk geometry. In this paper we show that this conventional wisdom is not correct: the ground-state wave function does not delocalize, and there is no conflict with the locality of the bulk geometry. This conclusion is obtained by clarifying the meaning of the 'diagonalization of a matrix' in Yang-Mills theory, which is not as obvious as one might think. This observation opens up the prospect of characterizing the bulk geometry via the color degrees of freedom in Yang-Mills theory, all the way down to the center of the bulk.
description: 26 pages, 2 figures. V2: a version accepted for publication in Phys. Rev. D. V3: Minor typos fixed, the published version
Chiral Corrections and the Axial Charge of the Delta
Creators: name: Jiang, Fu-Jiun
name: Tiburzi, Brian C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Chiral corrections to the delta axial charge are determined using heavy baryon chiral perturbation theory. Knowledge of this axial coupling is necessary to assess virtual-delta contributions to nucleon and delta observables. We give isospin relations useful for a lattice determination of the axial coupling. Furthermore we detail partially quenched chiral corrections, which are relevant to address partial quenching and/or mixed action errors in lattice calculations of the delta axial charge.
description: 4 pages, 3 figures, brief report
Το ιδιωτικό κόστος της ανάπτυξης του ανθρώπινου δυναμικού της εκπαίδευσης
Creators: name: Σιούτη, Καλλιόπη Σπυρίδωνος
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Επιμόρφωση
Εκπαίδευση ανθρώπινου δυναμικού
Ιδιωτικό κόστος
Education
Education of human resource
Private cost

description: Το κόστος της επιμόρφωσης των εκπαιδευτικών είναι ένα ζήτημα, το οποίο έχει μελετηθεί από διάφορους ερευνητές τόσο σε εθνικό όσο και σε παγκόσμιο επίπεδο. Ωστόσο, οι περισσότερες έρευνες που έχουν πραγματοποιηθεί δεν έχουν εξάγει ασφαλή συμπεράσματα αφενός μεν λόγω της δυσκολίας της έρευνας και αφετέρου λόγω των πολλών παραμέτρων που είναι αναγκαίο να ληφθούν. Η παρούσα έρευνα έχει σκοπό να εμπλουτίσει το ερευνητικό πεδίο διερευνώντας το ιδιωτικό κόστος των εκπαιδευτικών που εργάζονται στον δημόσιο και ιδιωτικό τομέα, αλλά και τις απόψεις των εκπαιδευτικών σε θέματα που αφορούν την επιμόρφωση. Τα αποτελέσματα της έρευνας έδειξαν ότι οι εκπαιδευτικοί δαπανούν χρήματα για την επιμόρφωσή τους και πιο συγκεκριμένα αυτοί που ανήκουν στον ιδιωτικό τομέα να έχουν διαθέσει περισσότερα, όμως με μικρή διαφορά. Τέλος, οι εκπαιδευτικοί θεωρούν ότι το κόστος των προγραμμάτων είναι αναγκαίο να το καλύπτουν το κράτος και οι εργοδότες
description: The cost of teachers education is an issue that has been studied by several researchers both nationally and globally. However, most studies have been conducted not draw firm conclusions on the one hand because of the difficulty of the investigation and also because of the many parameters that need to be taken. The present research aims to enrich the research field by investigating the private costs of teachers working in the public and private sectors as well as teachers' views on training issues. The results of the survey showed that teachers spend money for their training and more specifically those that work in the private sector have spend more, but with little difference. Finally, teachers consider that the cost of the programs is necessary to be covered by the state and employers
Guess who’s coming to dinner now?: perspectives on interracial relationships
Creators: name: Johl, Valgeet
Publisher: name: University of British Columbia
Year: 2009

description: Ethnomethodological studies have analyzed everyday activities with an intent to make those activities “visibly-rational-and-reportable-for-all-practical-purposes” (Garfinkel: 1 967). In that tradition, the current study offers an analysis of a seemingly unconventional pattern in mate selection that is based upon data collected through participant observation of, and unstructured interviews with interracial couples. The research suggests that greater frequency of contact between individuals of different racial backgrounds is likely to generate larger numbers of interracial relationships. This is in large part due to the fact that under such circumstances individuals become more aware of their similarities, and less conscious of the differences between them. The findings also suggest that the variables of age, geographic location of the couple, the relative socio-economic status of the couple and their family and friends, as well as the degree to which the individuals and their families have assimilated to Western traditions affect not only the success or failure of interracial relationships, but also the nature of the reactions that their relationship is likely to elicit. In the process of presenting and illuminating the findings the study incorporates discussion on the topics of mate selection options, actual choices, the couples’ interactions interpersonally, as well as with family, friends and the larger community, and portraits of interracial couples in various forms of media. In addition, a series of appendices are provided, listing specific media portraits of these couples, existing support groups serving this community, and an account of the researcher’s personal relationship to the field.
Telecommunication-wavelength two-dimensional photonic crystal cavities in a thin single-crystal diamond membrane
Creators: name: Kuruma, Kazuhiro
name: Piracha, Afaq Habib
name: Renaud, Dylan
name: Chia, Cleaven
name: Sinclair, Neil
name: Nadarajah, Athavan
name: Stacey, Alastair
name: Prawer, Steven
name: Lončar, Marko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We demonstrate two-dimensional photonic crystal cavities operating at telecommunication wavelengths in a single-crystal diamond membrane. We use a high-optical-quality and thin (~ 300 nm) diamond membrane, supported by a polycrystalline diamond frame, to realize fully suspended two-dimensional photonic crystal cavities with a high theoretical quality factor of ~ $8\times10^6$ and a relatively small mode volume of ~2$(λ/n)^3$. The cavities are fabricated in the membrane using electron-beam lithography and vertical dry etching. We observe cavity resonances over a wide wavelength range spanning the telecommunication O- and S-bands (1360 nm-1470 nm) with Q factors of up to ~1800. Our method offers a new direction for on-chip diamond nanophotonic applications in the telecommunication-wavelength range.
The signature of local cosmic structures on the ultra-high energy cosmic ray anisotropies
Creators: name: Cuoco, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Current experiments collecting high statistics in ultra-high energy cosmic rays (UHECRs) are opening a new window on the universe facing the possibility to perform UHECR astronomy. Here we discuss a large scale structure (LSS) model for the UHECR origin for which we evaluate the expected large scale anisotropy in the UHECR arrival distribution. Employing the IRAS PSCz catalogue as tracer of the LSS, we derive the minimum statistics needed to reject or assess the correlation of the UHECRs with the baryonic distribution in the universe, in particular providing a forecast for the Auger experiment.
description: 8 pages, 6 figures, contribution to the CRIS06 proceedings (Catania, Italy, May 29 - June 2, 2006)
Relatos de Cuiabá e kayabi
Creators: name: Mỹky, Kiwuxi
name: Rondon Amarante, Elizabeth
name: Bardagil Mas, Bernat
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2024
Subjects: subject: irn

description: 2 arquivos WAV. Digitalizado pela pesquisadora no Brasil.
Reform, Revision, Radikalisierung – Über die Krise gegenwärtiger Gleichstellungspolitik
Creators: name: Harzer, Regina
Publisher: name: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG)
Year: 2009

description: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG), IFFOnZeit Nr. 1 (2009)
Vesicle shape transformations driven by confined active filaments
Creators: name: Peterson, Matthew S. E.
name: Baskaran, Aparna
name: Hagan, Michael F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In active matter systems, deformable boundaries provide a mechanism to organize internal active stresses and perform work on the external environment. To study a minimal model of such a system, we perform particle-based simulations of an elastic vesicle containing a collection of polar active filaments. The interplay between the active stress organization due to interparticle interactions and that due to the deformability of the confinement leads to a variety of filament spatiotemporal organizations that have not been observed in bulk systems or under rigid confinement, including highly-aligned rings and caps. In turn, these filament assemblies drive dramatic and tunable transformations of the vesicle shape and its dynamics. We present simple scaling models that reveal the mechanisms underlying these emergent behaviors and yield design principles for engineering active materials with targeted shape dynamics.
description: Main text: 8 pages, 6 figures; Supplemental: 11 pages, 3 figures, 6 movies Changes: Added additional figures and discussion. Results are unchanged
Multidimensional integrable systems and deformations of Lie algebra homomorphisms
Creators: name: Dunajski, Maciej
name: Grant, James D. E.
name: Strachan, Ian A. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We use deformations of Lie algebra homomorphisms to construct deformations of dispersionless integrable systems arising as symmetry reductions of anti--self--dual Yang--Mills equations with a gauge group Diff$(S^1)$.
description: 14 pages. An example of a reduction to the Beltrami equation added. New title. Final version, published in JMP
NATO’s public diplomacy: Policies, structures, prospects and limitations
Creators: name: Ρουμελιώτης, Σωτήριος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ήπια δύναμη του ΝΑΤΟ
Στρατηγική δημόσια διπλωματία
Εξωτερική πολιτική
NATO’s soft power
Strategic discursive public diplomacy
Foreign policy

description: Τις τελευταίες δύο δεκαετίες, η Δύση έχει αναλάβει μια προσπάθεια να ανοικοδομήσει νέα έθνη με βάση τις αρχές της δημοκρατίας, της ελευθερίας και των ανθρωπίνων δικαιωμάτων. Ωστόσο, με εξαίρεση τις χώρες της Ανατολικής Ευρώπης που ενσωμάτωσαν τις Δυτικές αρχές, αυτές οι προσπάθειες έχουν βιώσει σημαντικές αποτυχίες από τα Βαλκάνια στις περιπτώσεις του Αφγανιστάν και του Ιράκ. Η κύρια αιτία της αποτυχίας είναι η απουσία ουσιαστικής επικοινωνίας με τους πολίτες σχετικά με τα εγχώρια και παγκόσμια ζητήματα, αγνοώντας την κοινωνική εξουσία. Η εφαρμογή αποσυνδεδεμένων πολιτικών με μια προσέγγιση από την κορυφή προς τα κάτω του Δυτικού κόσμου, αλληλεπιδρώντας με τις παγκόσμιες ελίτ και όχι με την κοινωνία, με στόχο την επιβολή της δομής του δυτικού τύπου σε έθνη με διαφορετική ιστορία, παράδοση, αξίες, είναι καταδικασμένες να αποτύχουν. Μια προσέγγιση από τη βάση προς την κορυφή θα ανοίξει διάλογο με το κοινό και θα προσπαθήσει να εισάγει αξίες και αρχές στην κοινωνία. Το ΝΑΤΟ είναι το μόνο στρατιωτικό εργαλείο μιας Συμμαχίας που αντιπροσωπεύει τις πολιτικές αποφάσεις της Δύσης παγκοσμίως και βρίσκεται υπό συνεχή αμφισβήτηση από την ίδρυσή του. Ο οργανισμός πρέπει να ακολουθήσει μια νέα ροή στρατηγικής διαλογικής δημόσιας διπλωματίας με βάση την προώθηση της παγκόσμιας ειρήνης, εφαρμόζοντας μια νέα εξωτερική πολιτική προσέγγισης για τα παγκόσμια δημόσια αγαθά.
description: During the last two decades, the West has been engaged in an effort to rebuild new nations upon the principles of democracy, liberty and human rights. However, with the exception of the Eastern European countries that integrated the Western principles, these efforts have experienced significant failures from the Balkans to the cases of Afghanistan and Iraq. The main cause of failure is the absence of substantive communication with the citizens over domestic and global issues, ignoring social power. Implementing disconnected policies with a top-down approach of the Western world, interacting with the world elites and not with society, aiming to impose the Western-style structure on nations with different history, tradition, values are doomed to fail. A bottom-up approach would open up a dialogue with the public and try to infuse values and principles into the society. NATO being the only military tool of an Alliance which represents the political decisions of the West globally is in the forefront of the critics, since its establishment. Instead of NATO professing image cultivation and branding campaigns, I argue that the organization must follow a new strategic discursive public diplomacy stream based upon a new peace narrative, implementing a new proactive foreign policy over global public goods.
Vereinbarkeit von Beruf und Familie – neue Problemlagen und Herausforderungen
Creators: name: Oechsle-Grauvogel, Mechtild
Publisher: name: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG)
Year: 2009

description: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG), IFFOnZeit Nr. 1 (2009)
Intrinsic nonlinear Hall effect in antiferromagnetic tetragonal CuMnAs
Creators: name: Wang, Chong
name: Gao, Yang
name: Xiao, Di
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Detecting the orientation of the Néel vector is a major research topic in antiferromagnetic spintronics. Here we recognize the intrinsic nonlinear Hall effect, which is independent of the relaxation time, as a prominent contribution to the time-reversal-odd second order conductivity and can be used to detect the flipping of the Néel vector. In contrast, the Berry-curvature-dipole-induced nonlinear Hall effect depends linear on relaxation time and is time-reversal-even. We study the intrinsic nonlinear Hall effect in an antiferromagnetic metal: tetragonal CuMnAs, and show that its nonlinear Hall conductivity can reach the order of mA/V$^2$. The dependence on the chemical potential of such nonlinear Hall conductivity can be qualitatively explained by a tilted massive Dirac model. Moreover, we demonstrate its strong temperature dependence and briefly discuss its competition with the second order Drude conductivity. Finally, a complete survey of magnetic point groups are presented, providing guidelines for finding more antiferromagnetic materials with the intrinsic nonlinear Hall effect.
The milliarcsecond-scale jet of PKS 0735+178 during quiescence
Creators: name: Agudo, I.
name: Gomez, J. L.
name: Gabuzda, D. C.
name: Marscher, A. P.
name: Jorstad, S. G.
name: Alberdi, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present polarimetric 5 GHz to 43 GHz VLBI observations of the BL Lacertae object PKS 0735+178, spanning March 1996 to May 2000. Comparison with previous and later observations suggests that the overall kinematic and structural properties of the jet are greatly influenced by its activity. Time intervals of enhanced activity, as reported before 1993 and after 2000 by other studies, are followed by highly superluminal motion along a rectilinear jet. In contrast the less active state in which we performed our observations, shows subluminal or slow superluminal jet features propagating through a twisted jet with two sharp bends of about 90 deg. within the innermost three-milliarcsecond jet structure. Proper motion estimates from the data presented here allow us to constrain the jet viewing angle to values < 9 deg., and the bulk Lorentz factor to be between 2 and 4.
description: 11 pages, 12 figures. Accepted for publication in A&A
Vermittlung von Genderkompetenz an der Universität Bielefeld: Der Studiengang MA Gender Studies – Ein Zwischenbericht
Creators: name: Banihaschemi, Susan
Publisher: name: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG)
Year: 2009

description: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG), IFFOnZeit Nr. 1 (2009)