cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ασκησιογενείς και μετα-ασκησιογενείς μεταβολές της στάθμης της γαστρίνης, σωματοστατίνης και κορτιζόλης του ορού υγιών αγύμναστων ανδρών και αθλητών αγωνισμάτων αντοχής με ή χωρίς την παρουσία του εληκοβακτηρίδιου του πυλωρού
Creators: name: Πατσανάς, Θωμάς
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Γαστρίνη
Σωματοστατίνη
Κορτιζόλη
Gastrin
Somatostatin
Cortisol

description: Βασικός σκοπός της εργασίας ήταν να μελετήσει την επίδραση μιας δοκιμασίας αερόβιας άσκησης στις ασκησιογενείς και μετα-ασκησιογενείς μεταβολές της γαστρίνης, σωματοστατίνης και κορτιζόλης του ορού 4 ομάδων με ή χωρίς την παρουσία του Ελικοβακτηριδίου του πυλωρού (H. pylori). Αιμοληψίες έγιναν προασκησιακά, στο τέλος της ασκησιακή φάσης και μετα-ασκησιακά κατά την περίοδο αποκατάστασης. Στα ληφθέντα δείγματα φλεβικού αίματος προσδιορίστηκε η συγκέντρωση της γαστρίνης της σωματοστατίνης και κορτιζόλης του ορού. Το ενδιαφέρον στην αξιολόγηση ήταν τα αποτελέσματα των προασκησιακών συγκεντρώσεων της γαστρίνης των εξετασθέντων αθλητών και αγύμναστων ατόμων με H. pylori σε σύγκριση με τους αθλητές και αγύμναστους χωρίς H.pylori. Επίσης, οι μεταβολές των ασκησιογενών μετα-ασκησιακών συγκεντρώσεων της γαστρίνης κατά την διάρκεια της περιόδου αποκατάστασης. Κατά την αξιολόγηση και σχολιασμό των αποτελεσμάτων διαπιστώθηκαν απόψεις που αφορούν πιθανούς λειτουργικούς μηχανισμούς, που θα μπορούσαν να ερμηνεύσουν τις προκύπτουσες προασκησιακές διαφορές καθώς και τις ασκησιογενείς και μετα-ασκησιακές διαφορές των ορμονών του ορού. Συμπερασματικά, η παρουσία του H. pylori και η αύξηση της βασικής έκκρισης της γαστρίνης-μέσω της προσκαλούμενης παθοφυσιολογικής διαταραχής που δημιουργεί-υπό την επίδραση παρατεταμένης υπομέγιστης άσκησης θα μπορούσε να θεωρηθεί ένας δυνητικός παθολογικός παράγοντας ιδιαίτερα σε άτομα-αθλητές που εμφανίζουν H.pylori και πεπτικό έλκος
description: The aim of this study was to evaluate the effect of an aerobic physical exercise onto the changes induced pre-exercise, after the exercise period and during the post-exercise recovered period, in the average concentration levels of gastrin, somatostatin, and cortisol in serum of four experimental groups, with or without the presence of Helicobacter pylori(H.pylori). Blood samples were taken pre-exercise, after the end of exercise and post-exercise during of recover period. In the vein-blood samples obtained, the concentrations levels of hormones were estimated. The interesting was focused on the pre-exercise concentration of gastrin between the groups of athletes and unstrained men with and without H. pylori. Furthermore, exercise and post-exercise changes of gastrin, at the same groups were interested too. At last, certain views with regard to the possible underling functional mechanisms might be able to interpret the pre-exercise, as well as the exercise and post exercise changes of serum hormones were discussed. In conclusions, the exercise-included increase of gastrin plus the presence of H.pylori-by the phathophysiological factor for patients-athletes with peptic ulcer and H.pylori
Collaborative Label Correction via Entropy Thresholding
Creators: name: Wu, Hao
name: Yao, Jiangchao
name: Wang, Jiajie
name: Chen, Yinru
name: Zhang, Ya
name: Wang, Yanfeng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Deep neural networks (DNNs) have the capacity to fit extremely noisy labels nonetheless they tend to learn data with clean labels first and then memorize those with noisy labels. We examine this behavior in light of the Shannon entropy of the predictions and demonstrate the low entropy predictions determined by a given threshold are much more reliable as the supervision than the original noisy labels. It also shows the advantage in maintaining more training samples than previous methods. Then, we power this entropy criterion with the Collaborative Label Correction (CLC) framework to further avoid undesired local minimums of the single network. A range of experiments have been conducted on multiple benchmarks with both synthetic and real-world settings. Extensive results indicate that our CLC outperforms several state-of-the-art methods.
description: ICDM 2019
Bound-State Variational Wave Equation For Fermion Systems In QED
Creators: name: Terekidi, Andrei G.
name: Darewych, Jurij W.
name: Horbatsch, Marko
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a formulation of the Hamiltonian variational method for QED which enables the derivation of relativistic few-fermion wave equation that can account, at least in principle, for interactions to any order of the coupling constant. We derive a relativistic two-fermion wave equation using this approach. The interaction kernel of the equation is shown to be the generalized invariant M-matrix including all orders of Feynman diagrams. The result is obtained rigorously from the underlying QFT for arbitrary mass ratio of the two fermions. Our approach is based on three key points: a reformulation of QED, the variational method, and adiabatic hypothesis. As an application we calculate the one-loop contribution of radiative corrections to the two-fermion binding energy for singlet states with arbitrary principal quantum number $n$, and $l =J=0$. Our calculations are carried out in the explicitly covariant Feynman gauge.
description: 26 pages
Are the distances of galactic microquasars reliable?
Creators: name: Foellmi, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We review some specific and quantitative issues in popular methods used to determine the distance of galactic objects, in the context of the microquasars GRO J1655-40 and 1A 0620-00. In particular, we discuss the domain of validity of the relationship between the Sodium lines and the color excess, and the supposedly systematic overestimation of optical absorption from X-ray data. Both problems imply a possible underestimation of the absorption toward GRO J1655-40. We also discuss the main issue concerning the absolute magnitude of the secondary star in our own maximum-distance method, that has been used on GRO J1655-40. We show in this respect that the dynamical parameters of this microquasar are not definitive, and that the mean properties of the secondary star is not so much different from that of a normal single star of same spectral type. Following the possibility that GRO J1655-40 is located at about 1.0 kpc, associated with the open cluster NGC 6242, we rise the question: which black-hole is the closest to the Sun? In that context, we quickly discuss the situation of the microquasar 1A 0620-00, by addressing the specific point of its 30-years-old extinction value. Finally, we present some details about a possible new distance method, using the surface properties of the stars, based on the cross-correlation function bisector, and that is now accessible thanks to the advent of a high-resolution echelle spectrograph called CRIRES at the VLT. We quickly discuss the strengths and weaknesses of this method, and how it possibly address the caveats of the other methods.
description: 10 pages, no figures, Accepted for publication in the proceedings of Microquasar '06 conference (Como, Italy), eds: T. Belloni et al. (2006)
Free-space optical neural network based on thermal atomic nonlinearity
Creators: name: Ryou, Albert
name: Whitehead, James
name: Zhelyeznyakov, Maksym
name: Anderson, Paul
name: Keskin, Cem
name: Bajcsy, Michal
name: Majumdar, Arka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Emerging Technologies (cs.ET)
subject: Optics (physics.optics)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: As artificial neural networks (ANNs) continue to make strides in wide-ranging and diverse fields of technology, the search for more efficient hardware implementations beyond conventional electronics is gaining traction. In particular, optical implementations potentially offer extraordinary gains in terms of speed and reduced energy consumption due to intrinsic parallelism of free-space optics. At the same time, a physical nonlinearity, a crucial ingredient of an ANN, is not easy to realize in free-space optics, which restricts the potential of this platform. This problem is further exacerbated by the need to perform the nonlinear activation also in parallel for each data point to preserve the benefit of linear free-space optics. Here, we present a free-space optical ANN with diffraction-based linear weight summation and nonlinear activation enabled by the saturable absorption of thermal atoms. We demonstrate, via both simulation and experiment, image classification of handwritten digits using only a single layer and observed 6-percent improvement in classification accuracy due to the optical nonlinearity compared to a linear model. Our platform preserves the massive parallelism of free-space optics even with physical nonlinearity, and thus opens the way for novel designs and wider deployment of optical ANNs.
Physical Significance of q Deformation and Many-Body Interactions in Nuclei
Creators: name: Sviratcheva, K. D.
name: Bahri, C.
name: Georgieva, A. I.
name: Draayer, J. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The quantum deformation concept is applied to a study of pairing correlations in nuclei with mass 40
description: 4 pages, 3 figures
Hybrid Reasoning and the Future of Iconic Representations
Creators: name: Recanati, Catherine
Publisher: name: arXiv
Year: 2008
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: We give a brief overview of the main characteristics of diagrammatic reasoning, analyze a case of human reasoning in a mastermind game, and explain why hybrid representation systems (HRS) are particularly attractive and promising for Artificial General Intelligence and Computer Science in general.
description: pp. 299-310
Μορφολογική, ιστοχημική και ανοσοκυτταροχημηκή μελέτη της επίδρασης θερμικού shock στη λεπτή δομή προνυμφικών σιαλογόνων αδένων της Drosophila auraria
Creators: name: Δημοπούλου, Αικατερίνη
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Θερμικό shock
Κυτταρικά οργανίδια
Drosophila auraria
Σιαλογόνοι αδένες
Ηλεκτρονικό μικροσκόπιο
Λεπτή δομή
Heat shock
Cell organelles
Salivary glands
Electron microscope
Fine structure

description: Στην παρούσα εργασία επιχειρήθηκε να εξεταστεί η επίδραση θερμικού shock στους σιαλογόνους αδένες του τρίτου προνυμφικού σταδίου ανάπτυξης της Drosophila auraria. Η επίδραση του θερμικού shock μελετήθηκε στο επίπεδο της λεπτής δομής των κυττάρων και τα αποτελέσματα ήταν σαφείς αλλαγές στη μορφολογική εμφάνιση των περισσότερων οργανιδίων του κυττάρου, οι οποίες εντείνονται, όσο αυξάνει η διάρκεια και η ένταση του θερμικού shock. Πιο συγκεκριμένα, οι αλλαγές που παρατηρήθηκαν και μπορούν να αποδοθούν στην επίδραση του θερμικού shock είναι οι εξής: (Ολόκληρη η περίληψη περιλαμβάνεται στο πλήρες κείμενο της διατριβής)
description: In the present study, an attempt was made to investigate the effect of heat shock treatment on salivary gland cells of Drosophila auraria third instar larvae. Heat shock treatment was studied at the ultrastructural level and the results were alterations on the morphology of most cellular organelles, which were more intense as the duration and/or intensity of heat shock was increased. More specifically, the alterations observed, that can be ascribed to heat shock, are: (The hole abstract is cοntained in the full text of the dissertation)
Σύνθεση και μελέτη ιδιοτήτων πολυεστέρων της 1,3-προπανοδιόλης με διάφορα αρωματικά δικαρβοξυλικά οξέα
Creators: name: Ρουπακιάς, Χρήστος
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: 1,3-προπανοδιόλη
Αρωματικά δικαρβοξυλικά οξέα
Απευθείας εστεροποίηση
Θερμοπλαστικοί πολυεστέρες
Πολυ(τερεφθαλικός προπυλενεστέρας)
1,3-propanediol
Aromatic dicarboxylic acids
Direct esterification
Thermoplastic polyesters
Poly(propylene terephthalate)

description: Σκοπός αυτής της εργασίας ήταν η σύνθεση των πολυεστέρων της 1,3-προπανοδιόλης με διάφορα αρωματικά δικαρβοξυλικά οξέα. Η σύνθεση πραγματοποιήθηκε με τη μέθοδο της απευθείας εστεροποίησης και την τεχνική του πολυμερισμού τήγματος. Το επόμενο στάδιο ήταν ο χαρακτηρισμός των πολυεστέρων με διάφορες μεθόδους. Επιπλέον, πραγματοποιήθηκε μια κινητική μελέτη διαφόρων καταλυτικών συστημάτων για τη σύνθεση των πολυεστέρων, προσπαθώντας να επιλέξουμε το πιο αποτελεσματικό.
description: The aim of the present thesis was the synthesis and the study of a number of properties of the polyesters of 1,3-Propanediol with several aromatic dicarboxylic acids. The synthesis of polyesters took place using the method of the direct esterification and the techique of the melt polymerization. The following step was the characterization of the polyesters with a number of methods. In addition, we moved to a kinetic study for the synthesis of the polyesters, testing several catalytic systems trying to find the most effective one.
Effect of magnetic pair breaking on Andreev bound states and resonant supercurrent in quantum dot Josephson junctions
Creators: name: Tkachov, Grygoriy
name: Richter, Klaus
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We propose a model for resonant Josephson tunneling through quantum dots that accounts for Cooper pair-breaking processes in the superconducting leads caused by a magnetic field or spin-flip scattering. The pair-breaking effect on the critical supercurrent $I_c$ and the Josephson current-phase relation $I(ϕ)$ is largely due to the modification of the spectrum of Andreev bound states below the reduced (Abrikosov-Gorkov) quasiparticle gap. For a quantum dot formed in a quasi-one-dimensional channel, both $I_c$ and $I(ϕ)$ can show a significant magnetic field dependence induced by pair breaking despite the suppression of the orbital magnetic field effect in the channel. This case is relevant to recent experiments on quantum dot Josephson junctions in carbon nanotubes. Pair-breaking processes are taken into account via the relation between the Andreev scattering matrix and the quasiclassical Green functions of the superconductors in the Usadel limit.
description: 5 pages, 6 eps figures, new results added
Bekenstein-Hod Universal Bound on Information Emission Rate Is Obeyed by LIGO-Virgo Binary Black Hole Remnants
Creators: name: Carullo, Gregorio
name: Laghi, Danny
name: Veitch, John
name: Del Pozzo, Walter
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Causality and the generalized laws of black hole thermodynamics imply a bound, known as the \textit{Bekenstein--Hod universal bound}, on the information emission rate of a perturbed system. Using a time-domain ringdown analysis, we investigate whether remnant black holes produced by the coalescences observed by Advanced LIGO and Advanced Virgo obey this bound. We find that the bound is verified by the astrophysical black hole population with $94\%$ probability, providing a first confirmation of the Bekenstein--Hod bound from black hole systems.
description: 7 pages, 2 figures, 1 Table
Μελέτη συστημάτων σύμμορφων στοιχειοκεραιών
Creators: name: Κάιφας, Θεόδωρος Ν.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Σύμμορφες στοιχειοκεραίες
Υπολογιστικός ηλεκτρομαγνητισμός
Conformal arrays
Computational electromagnetics

description: Η διατριβή αναλύει το πρόβλημα σύνθεσης των σύμμορφων στοιχειοκεραιών και περιγράφει τις μεθόδους που χρησιμοποιούνται. Η εργασία επικεντρώνεται σε τρείς διαφορετικές γεωμετρίες. Η πρώτη αναφέρεται στον κυκλικό κύλινδρο όπου με τη χρήση της συνάρτησης Green αναλύεται το κοντινό πεδίο μικροταινιακών στοιχειοκεραιών. Ενα σύνολο από πρακτικά αριθμητικά παραδείγματα ανάλυσης δείχνει τη δυνατότητα αριθμητικής επεξεργασίας με την ακολουθούμενη τεχνική. Η σύνθεση γίνεται με τη χρήση της ορθογωνικής μεθόδου όπου αναπτύσσονται συγκεκριμένα παραδείγματα. Η δεύτερη γεωμετρία αφορά σε μεταλλικό ελλειπτικό κώνο όπου εγκαθίστανται σχισμοκεραίες. Το πρόβλημα επιλύεται με τη χρήση της δυαδικής συνάρτησης Green και της ορθογωνικής μεθόδου. Τα αριθμητικά παραδείγματα που δίνονται εξηγούν τη δυνατότητα εφαρμογής της μεθόδου. Η τρίτη γεωμετρία αφορά σε μεταλλικό παραβολοειδές με συστοιχία σχισμοκεραιών. Εδώ χρησιμοποιείται η γεωμετρική θεωρία της περιθλάσεως μαζί με την ορθογωνική μέθοδο. Τα παραδείγματα δείχνουν ενδιαφέροντα από πρακτικής πλευράς αποτελέσματα και δείχνουν τη δυνατότητα εφαρμογής της ίδιας μεθοδολογίας σε γενικευμένες γεωμετρίες. Συμπερασματικά η διατριβή καλύπτει ένα σύνολο από σύμμορφες συστοιχίες χρήσιμες στις τηλεπικοινωνιακές εφαρμογές
description: The thesis study the problem of design conformal arrays and addresses the methods used for this purpose. The first one uses a circular cylinder where the Green's function is used to analyze the near and far field of microstrip arrays. To design the array the Orthogonal Method is employed. Various examples validate the adopted approach. The second geometry is that of slot arrays positioned on a conducting elliptic cone. The problem is solved using the dyadic Green function together with the Orthogonal Method. The presented numerical results prove the applicability of the method. The third geometry is that of a conducting paraboloid. Various slot array configurations are studied. Here the Orthogonal MEthod is employed after the Geometrical Theory of Diffraction, which provides the system's response. Presented results prompt the applicability of the method for generalized geometries. This work covers a board set of conformal arrays for telecommunication applications
Coadded Spectroscopic Stellar Parameters and Abundances from the LAMOST Low Resolution Survey
Creators: name: Hamer, Jacob H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: I combine duplicate spectroscopic stellar parameter estimates in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 6 Low Resolution Spectral Survey A, F, G, and K Type stellar parameter catalog. Combining repeat measurements results in a factor of two improvement in the precision of the spectroscopic stellar parameter estimates. Moreover, this trivializes the process of performing coordinate-based cross-matching with other catalogs. Similarly, I combine duplicate stellar abundance estimates for the Xiang et al. catalog which was produced using LAMOST Data Release 5 Low Resolution Spectral Survey data. These data have numerous applications in stellar, galactic, and exoplanet astronomy. The catalogs I produce are available as machine-readable tables at https://doi.org/10.7281/T1/QISGRU .
description: 2 pages, data available at https://doi.org/10.7281/T1/QISGRU
Study of the threshold behavior of the $η$N scattering amplitude through the associated photoproduction of $ϕ$- and $η$-mesons
Creators: name: Soyeur, Madeleine
name: Lutz, Matthias F. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We suggest that the $γp \to ϕηp$ reaction cross section, in the kinematics where the $ηp$ invariant mass in the final state lies between the threshold value (m$_p$+m$_η$) and the N*(1535) resonance mass, is largely determined by the $ηN$ scattering amplitude close to threshold. The initial photon energy is chosen in the range $4 < E_γ^{Lab} < 5$ GeV, in order to reach low (absolute) values of the squared 4-momentum transfer from the initial photon to the final $ϕ$-meson. In these conditions, we expect the t-channel $π^0$- and $η$-meson exchanges to drive the dynamics underlying the $γp \to ϕηp$ process. We show that the $η$-exchange is the dominating contribution to the cross section while the $π^0$-exchange is negligible. The $η$-$π^0$ interference is of the order of $20 - 30 %$. The sign of this term is not known and alters significantly our results. Data on the $γp \to ϕηp$ process would be therefore very useful to help unravelling the behavior of the $ηp$ scattering amplitude close to threshold and assessing the possibility of producing $η$-nucleus bound states.
description: 8 pages, 6 figures, Invited talk at MESON 2006, June 9th-13th, 2006, Cracow (Poland)
title: Z wie Zürich
Creators: name: Schlachetzki, Sarah M.
Publisher: name: Zentralbibliothek Zürich
Year: 2021
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::650 Management, Öffentlichkeitsarbeit::659 Werbung, Öffentlichkeitsarbeit
subject: 900 Geschichte und Geografie::940 Geschichte Europas::949 Geschichte anderer Teile Europas
subject: Zürich
subject: Kongresshaus Zürich
subject: Neuzeit
subject: Denkmalpflege
subject: Geschichte
subject: Kulturgeschichte
subject: Bauen

description: Zeitgeistig, ziemlich zahm, aber nicht zentriert. Als sie das Zürcher Kongresshaus planten, entwarfen die Architekten Haefeli, Moser und Steiger gleich ein leuchtendes Z mit dazu. Von Weitem sichtbar, sollte es auf der Fassade zum See hin prangen.
Seeking celestial Positronium with an OH-suppressed diffraction-limited spectrograph
Creators: name: Robertson, J. Gordon
name: Ellis, Simon
name: Yu, Qingshan
name: Bland-Hawthorn, Joss
name: Betters, Christopher
name: Roth, Martin
name: Leon-Saval, Sergio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Celestially, Positronium (Ps), has only been observed through gamma-ray emission produced by its annihilation. However, in its triplet state, a Ps atom has a mean lifetime long enough for electronic transitions to occur between quantum states. This produces a recombination spectrum observable in principle at near IR wavelengths, where angular resolution greatly exceeding that of the gamma-ray observations is possible. However, the background in the NIR is dominated by extremely bright atmospheric hydroxyl (OH) emission lines. In this paper we present the design of a diffraction-limited spectroscopic system using novel photonic components - a photonic lantern, OH Fiber Bragg Grating filters, and a photonic TIGER 2-dimensional pseudo-slit - to observe the Ps Balmer alpha line at 1.3122 microns for the first time.
description: 6 pages, 9 Figures, 2 Tables. Accepted to Applied Optics feature issue on Astrophotonics
From Formation to Disruption: Observing the Multiphase Evolution of a Solar Flare Current Sheet
Creators: name: Chitta, L. P.
name: Priest, E. R.
name: Cheng, X.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: A current sheet, where magnetic energy is liberated through reconnection and is converted to other forms, is thought to play the central role in solar flares, the most intense explosions in the heliosphere. However, the evolution of a current sheet and its subsequent role in flare-related phenomena such as particle acceleration is poorly understood. Here we report observations obtained with NASA's Solar Dynamics Observatory that reveal a multiphase evolution of a current sheet in the early stages of a solar flare, from its formation to quasi-stable evolution and disruption. Our observations have implications for the understanding of the onset and evolution of reconnection in the early stages of eruptive solar flares.
description: Publication in the Astrophysical Journal
Χαρακτηρισμός και μελέτη της κινάσης πρωτεϊνών που φωσφορυλιώνει τις επαναλαμβανόμενες αλληλουχίες αργινίνης/σερίνης του αμινοτελικού άκρου του υποδοχέα της λαμίνης Β
Creators: name: Μυλωνής, Ηλίας Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: LBR
SRPK1
RS domain

description: Σκοπός της εργασίας ήταν η μελέτη μιας δραστικότητας κινάσης πρωτεϊνών που φωσφορυλιώνει την ακολουθία αργινίνης/σερίνης που περιέχεται στο αμινοτελικό άκρο του υποδοχέα της λαμίνης Β. Προκειμένου να επιτευχθεί ο συγκεκριμένος στόχος χρησιμοποιήθηκαν χρωματογραφικές τεχνικές για τον καθαρισμό της δραστικότητας από κυτταρόπλασμα όρχεων αρουραίου. Ακολούθως η δραστικότητα χαρακτηρίστηκε με βάση τεχνικές ανοσοανίχνευσης, συγκατακρίμνησης και χαρτών φωσφοπεπτιδίων. Μελέτη του ρόλου της φωσφορυλίωσης έγινε με τεχνικές συγκατακρίμνησης, in situ υβριδισμού σε τομές όρχεων ποντικού και ανοσοφθορισμό. Ακολουθώντας την ίδια μεθοδολογία μελετήθηκε η ρύθμιση της δραστικότητας της SRPK1 κινάσης πρωτεϊνών από την CK2. Με βάση τις παραπάνω τεχνικές βρέθηκε ότι υπεύθυνη για την φωσφορυλίωση του υποδοχέα της λαμίνης Β είναι η SRPK1 κινάση πρωτεϊνών και η φωσφορυλίωση αυτή ρυθμίζει πρωτεϊνικές αλληλεπιδράσεις στο σύμπλοκο που σχηματίζει ο υποδοχέας της λαμίνης Β. Επίσης η φωσφορυλίωση της SRPK1 από την CK2 κινάση πρωτεϊνών έχει ως αποτέλεσμα την αύξηση της δραστικότητας του ενζύμου.
description: The present thesis examines a protein kinase activity that phosphorylates the N-terminal domain of LBR inside its rs motif. This phosphorylating activity was purified from rat testis cytosol using chromatographic techniques. In a following step the purified activity was characterized using western blotting analysis, GST pull down assays, phosphopeptide mapping and in vitro phosphorylation of RS domain containing substrates. In addition it was examined the role of this phosphorylation using GST pull down assays, in situ hybridization on mouse testis and immunofluorescence microscopy. Following the same approach it was examined the potential role of CK2 phosphorylation on the SRPK1 molecule. It was shown that SRPK1 is responsible for the phosphorylating activity on LBR and this phosphorylation is regulating protein-protein interactions between the LBR complex members. It was also found that CK2 activates SRPK1 by phosphorylating two serine residues.
Μελέτη της έλλειψης Fe στη ροδακινιά
Creators: name: Μολασιώτης, Αθανάσιος Ν.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Σίδηρος(fe)
Υποκείμενα ροδακινιάς
Iron(fe)
Peach rootstocks

description: Καταβλήθηκε προσπάθεια ώστε να διερευνηθεί εαν η έλλειψη Fe και οι σχετικοί μηχανισμοί ανθεκτικότητας εκφράζονται με διαφορετικό τρόπο στις ρίζες πέντε υποκειμένων ροδακινιάς. Η έλλειψη Fe προκλήθηκε με την αφαίρεση Fe(-fe) ή με την προσθήκη NaHCO3 (5,10 και 20mm) στο θρεπτικό διάλυμα Hoaglond για 4 μήνες. Στις ρίζες των φυτών που καλλιεργήθηκαν χωρίς Fe(-fe) και ιδιαίτερα στην πείπτωση των NaHCO3 παρατηρήθηκε μείωση του ξηρού βάρους, των συγκεντρώσεων ολικού και ενεργού Fe όπως επίσης και αλλαγές στις συγκεντρώσεις Mn, Zn και K. Σε συνθήκες -Fe παρατηρήθηκε αύξηση της δράσης Fe- (FCR) στις ρίζες των υποκειμένων. Αντίθετα με εξαίρεση και το ανθεκτικό υποκείμενο GF-677 στην έλλειψη fe, η δράση της FCR μειώθηκε στην περίπτωση των 20mm NaHCO3. Τα παραπάνω αποτελέσματα επιβεβαιώθηκαν με τον προσδιορισμό της δράσης της FCR. Επίσης απελευθερώνοντας H+ παρατηρήθηκε στις ρίζες του GF-677 που καλλιεργήθηκαν χωρίς Fe(-fe). Σε συνθήκες έλλειψης Fe, γενοτυπικές αντιοξειδωτικές αντιδράσεις ως αλλαγές στη δράση της υπεροξείδωσης, των μηενζυμικών αντιοξειδωτικών καταγράφηκαν στις ρίζες των υποκειμένων. Εκτός Gf-677, ένα ισο ένζυμο της υπεροξειδάσης δεν ανιχνεύτηκε στις ρίζες των υποκειμένων που αναπτύχθηκαν σε συνθήκες έλλειψης fe
description: An attepmt was made to investigate whether fe deficiency and related mechanismus were expressed differantly in roots of five peach rootstocks. Fe deficiency was imposed by omission of fe(-fe) or by inclusion of bicarbonate(supplied as 5,10 and 20mm NaHCO3) in the Hoaglond nutrient solution for four months. In the fe-deprivated roots and especially those treated with bicarbonate a decrease in dry weight, total and active fe concentrations, as well as changes in Mn, Zn and K concentrations were recorded. Omission of fe resulted in an increase of root fe-chelate reductase(FCR). By contrast, FCR activity was depressed in the 20mM NaHCO3-treated roots, except for the tolerant to fe assay confirmed by an agarose-based staining technique used to localize FCR activity. Also, an ag ar-pH-test revealed that the (fe-)-treated roots of GF-677 induced proton extrusion. Genotype depended antioxidant responses in the fe-deprived roots were detected by monitoring changes in the activities of peroxidage, cataloge and the non-enzymatre antioxidant. A part from the GF-677 rootstock, a peroxidage isoenzyme was not detected in fe-deprived roots
Improving $z\sim7-11$ Galaxy Property Estimates with JWST/NIRCam Medium-Band Photometry
Creators: name: Roberts-Borsani, Guido
name: Treu, Tommaso
name: Mason, Charlotte
name: Schmidt, Kasper B.
name: Jones, Tucker
name: Fontana, Adriano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The past decade has seen impressive progress in the detection of $z>7$ galaxies with the Hubble Space Telescope, however little is known about their properties. The James Webb Space Telescope will revolutionise the high-$z$ field by providing NIR (i.e., rest-frame optical) data of unprecedented depth and spatial resolution. Measuring galaxy quantities such as resolved stellar ages or gas metallicity gradients traditionally requires spectroscopy, as broad-band imaging filters are generally too coarse to fully isolate diagnostics such as the 4000 Å (rest-frame) break, continuum emission from aged stars, and key emission lines (e.g., [OII], [OIII], H$β$). However, in this paper, we show that adding NIRCam images through a strategically chosen medium-band filter to common wide-band filters sets adopted by ERS and GTO programs delivers tighter constraints on these galactic properties. To constrain the choice of filter, we perform a systematic investigation of which combinations of wide-band filters from ERS and GTO programs and single medium-band filters offer the tightest constraints on several galaxy properties at redshifts $z\sim7-11$. We employ the JAGUAR extragalactic catalogs to construct statistical samples of physically-motivated mock photometry and conduct SED-fitting procedures to evaluate the accuracy of galaxy property (and photo-$z$) recovery with a simple star-formation history model. We find that adding $>4.1 μ$m medium filters at comparable depth to the broad-band filters can significantly improve photo-$z$s and yield close to order-of-magnitude improvements in the determination of quantities such as stellar ages, metallicities, SF-related quantities and emission line fluxes at $z\sim8$. For resolved sources, the proposed approach enables spatially-resolved determination of these quantities that would be prohibitive with slit spectroscopy.
description: 13 pages, 7 figures. Accepted for publication in ApJ
Phase front analysis of laminar vortex streets
Creators: name: Lefrançois, Marcel
Publisher: name: University of British Columbia
Year: 2008

description: The continuous formation and development of a laminar vortex street behind a circular cylinder has been modelled as a Huygens-type wave process. The phase of a point next to the cylinder is defined by the amplitude and phase of secondary wavelet centres along the preceding vortexin the near wake. Vortices are located at places where the phase in each cycle is 0 or n. The phase is defined from a Kirchhoff-type phase-amplitude integral which is derived from the Biot-Savart law. Model predictions agree with reported experimental results on cylinders with steps and tapers, and with our own tapered cylinder experiments. To test the predictive power of the model, with regards to preset phase, experiments were performed with new experimental techniques that allow us to set the start-up phase of vortex shedding. The experiments yield known starting conditions, which, when introduced into the phase front model, yield predictions of the street in good agreement with the experiments with regard to the shape and position of the shed vortices in the wake.
Planets Formed in Habitable Zones of M Dwarf Stars Probably are Deficient in Volatiles
Creators: name: Lissauer, Jack J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Dynamical considerations, presented herein via analytic scalings and numerical experiments, imply that Earth-mass planets accreting in regions that become habitable zones of M dwarf stars form within several million years. Temperatures in these regions during planetary accretion are higher than those encountered by the material that formed the Earth. Collision velocities during and after the prime accretionary epoch are larger than for Earth. These factors suggest that planets orbiting low mass main sequence stars are likely to be either too distant (and thus too cold) for carbon/water based life on their surfaces or have abundances of the required volatiles that are substantially less than on Earth.
description: 11 pages, 1 figure, Astrophysical Journal Letters, in press
Διαρθρωτικές αλλαγές σε αγροτική περιφέρεια: μια εφαρμογή εισροών-εκροών
Creators: name: Ciobanu, Claudia
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Ανατολική Μακεδονία και Θράκη
Διαρθρωτικές αλλαγές
Περιφέρεια
Δείκτες
East Macedonia and Thrace
Structural changes
Region
Indicators

description: Γενικά, η διαρθρωτική αλλαγή σχετίζεται με την συστηματική έρευνα στις μεταβολές των απαιτήσεων εισροών, στην παραγωγή νέων προϊόντων και στο σχετικό μέγεθος των κλάδων μιας οικονομίας, σε μια συγκεκριμένη περίοδο. Αυτή η διαδικασία επιτρέπει την εξέταση του υποδείγματος των διακλαδικών συναλλαγών, δίνοντας έτσι ένα συγκριτικό και σταθερό πλαίσιο για τον προγραμματισμό και την ανάλυση της αναπτυξιακής πολιτικής. Σύμφωνα με τα παραπάνω, η παρούσα έρευνα συνιστάται στην εφαρμογή του υποδείγματος εισροών-εκροών προκειμένου να εξετάσει τις διαρθρωτικές αλλαγές σε μια διάρκεια δεκαεπτά ετών στην οικονομία της περιφέρειας της Ανατολικής Μακεδονίας και Θράκης, μια περιφέρεια που παρουσίασε σημαντικές μεταβολές μετά την ένταξη της Ελλάδας στην Ευρωπαϊκή Ενωση το 1981. Η μέθοδος περιφεροποίησης GRIT (Generation of Regional Input-Output Tables) χρησιμοποιήθηκε για την κατασκευή του σχετικού περιφερειακού υποδείγματος εισροών-εκροών. Στην συνέχεια οι μεταβολές στην διάρθρωση της περιφερειακής οικονομίας εκτιμούνται με διάφορους δείκτες. Τα αποτελέσματα δείχνουν ότι μεταξύ 1980 και 1997, η οικονομία της περιφέρειας παρουσίασε σημαντικές αλλαγές οι οποίες επηρέασαν όχι μόνο τους κλάδους της παραγωγής αλλά και της κατανάλωσης. Επιπλέον, τα αποτελέσματα σκιαγραφούν τις πιθανές αλλαγές στην διάρθρωση της περιφερειακής οικονομίας.
Realization of a multi-node quantum network of remote solid-state qubits
Creators: name: Pompili, Matteo
name: Hermans, Sophie L. N.
name: Baier, Simon
name: Beukers, Hans K. C.
name: Humphreys, Peter C.
name: Schouten, Raymond N.
name: Vermeulen, Raymond F. L.
name: Tiggelman, Marijn J.
name: Martins, Laura dos Santos
name: Dirkse, Bas
name: Wehner, Stephanie
name: Hanson, Ronald
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The distribution of entangled states across the nodes of a future quantum internet will unlock fundamentally new technologies. Here we report on the experimental realization of a three-node entanglement-based quantum network. We combine remote quantum nodes based on diamond communication qubits into a scalable phase-stabilized architecture, supplemented with a robust memory qubit and local quantum logic. In addition, we achieve real-time communication and feed-forward gate operations across the network. We capitalize on the novel capabilities of this network to realize two canonical protocols without post-selection: the distribution of genuine multipartite entangled states across the three nodes and entanglement swapping through an intermediary node. Our work establishes a key platform for exploring, testing and developing multi-node quantum network protocols and a quantum network control stack.
description: 9 pages, 5 figures, supplementary materials
Effect of VAT rate reduction for fruits and vegetables on prices in Latvia: ex-post analysis
Creators: name: Nipers, Aleksejs
name: Upite, Ilze
name: Pilvere, Irina
name: Stalgiene, Aldona
name: Viira, Ants-Hannes
Publisher: name: Agraarteadus
Year: 2019
Subjects: VAT
reduction
fruits and vegetables
pass-through
article

description: Latvia reduced Value Added Tax (VAT) rate for some fresh fruits and vegetables in 2018. The reduced VAT rate is set at 5%, while the standard VAT rate in the country is 21%. The rate was reduced for a 3-year period, during which it is intended to assess the impacts of the policy and to decide whether to keep the reduced VAT rate after the period ends. This research aims to evaluate whether VAT reduction reduced retail prices of fruits and vegetables. As prices on various fruits and vegetables are quite volatile, we used prices for exactly the same products in neighbouring Estonia and Lithuania as controls. We found that although in the first year after the VAT reduction retail prices decreased considerably, the decrease was smaller than the VAT reduction – the passthrough effect was 88%. However, due to the limited competition in the retail sector, it is important to continue observation in order to draw conclusions about the long-term effect.
Concurrence Percolation in Quantum Networks
Creators: name: Meng, Xiangyi
name: Gao, Jianxi
name: Havlin, Shlomo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Establishing long-distance quantum entanglement, i.e., entanglement transmission, in quantum networks (QN) is a key and timely challenge for developing efficient quantum communication. Traditional comprehension based on classical percolation assumes a necessary condition for successful entanglement transmission between any two infinitely distant nodes: they must be connected by at least a path of perfectly entangled states (singlets). Here, we relax this condition by explicitly showing that one can focus not on optimally converting singlets but on establishing concurrence -- a key measure of bipartite entanglement. We thereby introduce a new statistical theory, concurrence percolation theory (ConPT), remotely analogous to classical percolation but fundamentally different, built by generalizing bond percolation in terms of "sponge-crossing" paths instead of clusters. Inspired by resistance network analysis, we determine the path connectivity by series/parallel rules and approximate higher-order rules via star-mesh transforms. Interestingly, we find that the entanglement transmission threshold predicted by ConPT is lower than the known classical-percolation-based results and is readily achievable on any series-parallel networks such as the Bethe lattice. ConPT promotes our understanding of how well quantum communication can be further systematically improved versus classical statistical predictions under the limitation of QN locality -- a "quantum advantage" that is more general and efficient than expected. ConPT also shows a percolation-like universal critical behavior derived by finite-size analysis on the Bethe lattice and regular two-dimensional lattices, offering new perspectives for a theory of criticality in entanglement statistics.
description: Phys. Rev. Lett. 126, 170501 (2021)
Spitzer IRS spectra of a large sample of Seyfert galaxies: a variety of infrared SEDs in the local AGN population
Creators: name: Buchanan, Catherine L.
name: Gallimore, Jack F.
name: O'Dea, Christopher P.
name: Baum, Stefi A.
name: Axon, David J.
name: Robinson, Andrew
name: Elitzur, Moshe
name: Elvis, Martin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We are conducting a large observing program with the Spitzer Space Telescope to determine the mid-to-far infrared spectral energy distributions of a well-defined sample of 87 nearby, 12 micron-selected Seyfert galaxies. In this paper we present the results of IRS low-resolution spectroscopy of a statistically representative subsample of 51 of the galaxies (59%), with an analysis of the continuum shapes and a comparison of the Seyfert types. We find that the spectra clearly divide into groups based on their continuum shapes and spectral features. Some spectral features are clearly related to a starburst contribution to the IR spectrum, while the mechanisms producing observed power-law continuum shapes, attributed to an AGN component, may be dust or non-thermal emission. The infrared spectral types appear to be related to the Seyfert types. Principal component analysis results suggest that the relative contribution of starburst emission may be the dominant cause of variance in the observed spectra. We find that Sy 1's have higher ratios of IR/radio emission than Sy 2's, as predicted by the unified model if the torus is optically thick in the mid-IR. However, smooth-density torus models predict a much larger difference between type 1's and 2's than observed in our sample. Our observations may be consistent with clumpy torus models containing a steep radial distribution of optically thick dense clumps. (Abridged)
description: 39 pages, 17 figures, accepted to AJ, version with high-resolution figures available at http://www.cis.rit.edu/~clbsps/papers/buchanan.pdf
Τύποι 1 βέλτιστοι 3m σχεδιασμοί και m1xm2xm3 D-βέλτιστοι κορεσμένοι σχεδιασμοί
Creators: name: Χατζόπουλος, Σταύρος
Publisher: name: Aristotle University of Thessaloniki
Year: 2003

description: Αντικείμενο της παρούσας διατριβής είναι η μελέτη των παραγοντικών σχεδιασμών ως προς κάποια κριτήρια βελτιστοποίησης και η κατασκευή των βέλτιστων σχεδιασμών όπου είναι εφικτό. Αναλυτικότερα : Στα κεφάλαια 2 και 3 αποδεικνύεται ότι ο σχεδιασμός που προκύπτει προσθέτοντας α παρατηρήσεις, 2_
description: The objective of this paper is to study factorial designs under different types of criteria and the construction of optimal designs, where this is feasible. Analytically : in chapters 2 and 3 we prove that the design which arise by adding a specific runs, 2_
PyAutoFit: A Classy Probabilistic Programming Language for Model Composition and Fitting
Creators: name: Nightingale, James. W.
name: Hayes, Richard G.
name: Griffiths, Matthew
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Programming Languages (cs.PL)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: A major trend in academia and data science is the rapid adoption of Bayesian statistics for data analysis and modeling, leading to the development of probabilistic programming languages (PPL). A PPL provides a framework that allows users to easily specify a probabilistic model and perform inference automatically. PyAutoFit is a Python-based PPL which interfaces with all aspects of the modeling (e.g., the model, data, fitting procedure, visualization, results) and therefore provides complete management of every aspect of modeling. This includes composing high-dimensionality models from individual model components, customizing the fitting procedure and performing data augmentation before a model-fit. Advanced features include database tools for analysing large suites of modeling results and exploiting domain-specific knowledge of a problem via non-linear search chaining. Accompanying PyAutoFit is the autofit workspace (see https://github.com/Jammy2211/autofit_workspace), which includes example scripts and the HowToFit lecture series which introduces non-experts to model-fitting and provides a guide on how to begin a project using PyAutoFit. Readers can try PyAutoFit right now by going to the introduction Jupyter notebook on Binder (see https://mybinder.org/v2/gh/Jammy2211/autofit_workspace/HEAD) or checkout our readthedocs(see https://pyautofit.readthedocs.io/en/latest/) for a complete overview of PyAutoFit's features.
description: Published in the Journal of Open Source Software
Remarks on bell-shaped lumps: stability and fermionic modes
Creators: name: Brihaye, Y.
name: Delsate, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider non-topological, "bell-shaped" localized and regular solutions available in some 1+1 dimensional scalar field theories. Several properties of such solutions are studied, namely their stability and the occurence of fermion bound states in the background of a kink and a kink-anti-kink solutions of the sine-Gordon model.
description: 8 pages, 4 figures
Matching tetrads in f(T) gravity
Creators: name: Fiorini, Franco
name: Onetto, Martín
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The procedure underlying the matching of 1-form (tetrad) fields in theories possessing absolute parallelism -- f(T) gravity being within this category -- is addressed and exemplified. We show that the remnant symmetries of the intervening spaces play a central role in the process, because the knowledge of the remnant group of local Lorentz transformations enables one to perform rotations and/or boosts in order to $\mathcal{C}^{1}$-match the corresponding tetrads on the junction surface. This automatically ensures the continuity of the Weitzenböck scalar there, even though this proves to be just a necessary condition in order to obtain a global parallelization of the spacetime.
description: 6 pages, one figure. Final version published in PRD
Exchange bias without directional anisotropy in Permalloy/CoO bilayers
Creators: name: Mitrofanov, Alexander
name: Chen, Guanxiong
name: Kozhanov, Alexander
name: Urazhdin, Sergei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We utilize transverse ac susceptibility measurements to characterize magnetic anisotropy in archetypal exchange-bias bilayers of ferromagnet Permalloy (Py) and antiferromagnet CoO. Unidirectional anisotropy is observed for thin Py, but becomes negligible at larger Py thicknesses, even though the directional asymmetry of the magnetic hysteresis loop remains significant. Additional magnetoelectronic measurements, magneto-optical imaging, as well as micromagnetic simulations show that these surprising behaviors are likely associated with asymmetry of spin flop distribution created in CoO during Py magnetization reversal, which facilitates the rotation of the latter back into its field-cooled direction. Our findings suggest new possibilities for efficient realization of multistable nanomagnetic systems for neuromorphic applications.
description: 12 pages, 8 figures. Comments, including suggestions for relevant citations, are welcome