cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Direct measurement of quantum phase gradients in superfluid 4He flow
Creators: name: Sato, Yuki
name: Joshi, Aditya
name: Packard, Richard
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report a new kind of experiment in which we generate a known superfluid velocity in a straight tube and directly determine the phase difference across the tube's ends using a superfluid matter wave interferometer. By so doing, we quantitatively verify the relation between the superfluid velocity and the phase gradient of the condensate macroscopic wave function. Within the systematic error of the measurement (~10%) we find v_s=(hbar/m_4)*(grad phi).
title: Recherche et évaluation d’applications numériques intégrées dans l’enseignement de l’économie au secondaire 1
title: Recherche et évaluation d’applications numériques intégrées dans l’enseignement de l’économie au secondaire 1
titleType: AlternativeTitle
Creators: name: Santoro, Giovanni
name: Trieu, Raimond
Publisher: name: Unknown
Year: 0
Subjects: subject: application numérique
subject: utilité
subject: utilisabilité
subject: acceptabilité
subject: typologie
subject: économie

description: Ce travail est né de notre parcours atypique à la HEP Vaud dû au confinement et aux questionnements relatifs au numérique dans l’enseignement. Nous avons constaté que cette situation a mis en évidence des lacunes dans notre système face à de tels événements mais aussi le potentiel des TIC pour compléter et instrumentaliser l’enseignement. L’épidémie a accentué l’utilisation du numérique et par conséquent son usage dans nos pratiques d’enseignement. Au travers de ces constatations, ce mémoire de Master consiste, premièrement, à établir un inventaire des applications numériques dans l’enseignement de l’économie au secondaire 1 par le biais d’une typologie. Deuxièmement, à élaborer un outil d’analyse permettant de déterminer la pertinence d’intégration d’une application numérique dans une séquence d’enseignement en présentiel. Finalement, notre objectif est de développer notre regard critique sur nos pratiques d’enseignement afin d’élaborer nos futures séquences pédagogiques en utilisant les moyens et méthodes les plus appropriés selon l’environnement d’apprentissage. Notre manière de procéder afin de répondre à notre problématique a consisté à nous appuyer sur notre cadre théorique pour premièrement faire un inventaire des pratiques et usages du numérique auprès d’enseignants en économie et droit actuellement en poste dans le canton de Vaud. Cet inventaire nous a permis de compléter notre typologie en y amenant des informations qualitatives sur les différentes applications qu’ils ont pu mettre en pratique durant l’année scolaire. Dans un second temps, nous avons sélectionné 4 applications que nous avons expérimentées lors de séquences dans le cadre de nos stages respectifs avec nos élèves. Pour finir, les résultats d’enquêtes de nos élèves et de notre propre expérience sur l'application numérique mise en pratique dans une séquence d'enseignement sont présentés.
Generalized information theoretic measure to discern the quantumness of correlations
Creators: name: Devi, A. R. Usha
name: Rajagopal, A. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A novel measure, quantumness of correlations is introduced here for bipartite states, by incorporating the required measurement scheme crucial in defining any such quantity. Quantumness coincides with the previously proposed measures in special cases and it vanishes for separable states - a feature not captured by the measures proposed earlier. It is found that an optimal generalized measurement on one of the parts leaves the overall state in its closest separable form, which shares the same marginal for the other part, implying that quantumness is non-zero for all entangled bipartite states and it serves as an upper bound to the relative entropy of entanglement.
description: 5 pages, no figures, Revtex, Minor changes; Accepted for publication in Physical Review Letters
The single-particle density matrix and the momentum distribution of dark "solitons" in a Tonks-Girardeau gas
Creators: name: Buljan, H.
name: Lelas, K.
name: Pezer, R.
name: Jablan, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the reduced single-particle density matrix (RSPDM), the momentum distribution, natural orbitals and their occupancies, of dark "soliton" (DS) states in a Tonks-Girardeau gas. DS states are specially tailored excited many-body eigenstates, which have a dark solitonic notch in their single-particle density. The momentum distribution of DS states has a characteristic shape with two sharp spikes. We find that the two spikes arise due to the high degree of correlation observed within the RSPDM between the mirror points ($x$ and $-x$) with respect to the dark notch at $x=0$; the correlations oscillate rather than decay as the points $x$ and $-x$ are being separated.
description: 9 pages, 8 figures
Stirring the Embers: High Sensitivity VLBI Observations of GRB030329
Creators: name: Pihlström, Y. M.
name: Taylor, G. B.
name: Granot, J.
name: Doeleman, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present high sensitivity Very Long Baseline Interferometry (VLBI) observations 806 days after the gamma-ray burst of 2003 March 29 (GRB030329). The angular diameter of the radio afterglow is measured to be 0.347 +- 0.09 mas, corresponding to 0.99 +- 0.26 pc at the redshift of GRB030329 (z = 0.1685). The evolution of the image size favors a uniform external density over an R^-2 wind-like density profile (at distances of R >~10^18 cm from the source), although the latter cannot be ruled out yet. The current apparent expansion velocity of the image size is only mildly relativistic, suggesting a non-relativistic transition time of t_NR ~ 1 yr. A rebrightening, or at least a significant flattening in the flux decay, is expected within the next several years as the counter-jet becomes visible (this has not yet been observed). An upper limit of <1.9c is set on the proper motion of the flux centroid.
description: 16 pages, 5 figures, accepted for publication in Astrophysical Journal
Mechanical measurement of equilibrium spin currents in the Rashba medium
Creators: name: Sonin, E. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We demonstrate that an equilibrium spin current in a 2D electron gas with Rashba spin-orbit interaction (Rashba medium) results in a mechanical torque on a substrate near an edge of the medium. If the substrate is a cantilever, the mechanical torque displaces the free end of the cantilever. The effect can be enhanced and tuned by a magnetic field. Observation of this displacement would be an effective method to prove existence of equilibrium spin currents. The analysis of edges of the Rashba medium demonstrates the existence of localized edge states. They form a 1D continuum of states. This suggests a new type of quantum wire: spin-orbit quantum wire.
description: 4 pages, 1 figure
Third-order cosmological perturbations of zero-pressure multi-component fluids: Pure general relativistic nonlinear effects
Creators: name: Hwang, J.
name: Noh, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Present expansion stage of the universe is believed to be mainly governed by the cosmological constant, collisionless dark matter and baryonic matter. The latter two components are often modeled as zero-pressure fluids. In our previous work we have shown that to the second-order cosmological perturbations, the relativistic equations of the zero-pressure, irrotational, multi-component fluids in a spatially near flat background effectively coincide with the Newtonian equations. As the Newtonian equations only have quadratic order nonlinearity, it is practically interesting to derive the potential third-order perturbation terms in general relativistic treatment which correspond to pure general relativistic corrections. Here, we present pure general relativistic correction terms appearing in the third-order perturbations of the multi-component zero-pressure fluids. We show that, as in a single component situation, the third-order correction terms are quite small (~ 5 x10^{-5} smaller compared with the relativistic/Newtonian second-order terms) due to the weak level anisotropy of the cosmic microwave background radiation. Still, there do exist pure general relativistic correction terms in third-order perturbations which could potentially become important in future development of precision cosmology. We include the cosmological constant in all our analyses.
description: 20 pages, no figure
Additional file 1 of Construction of machine learning tools to predict threatened miscarriage in the first trimester based on AEA, progesterone and β-hCG in China: a multicentre, observational, case-control study
Creators: name: Huang, Jingying
name: Lv, Ping
name: Lian, Yunzhi
name: Zhang, Meihua
name: Ge, Xin
name: Li, Shuheng
name: Pan, Yingxia
name: Zhao, Jiangman
name: Xu, Yue
name: Tang, Hui
name: Li, Nan
name: Zhang, Zhishan
Publisher: name: figshare
Year: 2022
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Pharmacology
subject: Biotechnology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer

description: Additional file 1: Fig. S1. Construction 6 models to predict inevitable miscarriage. The figure shows the average ROC curves of the 6 models. The mean AUC values with standard deviations of the different prediction models are shown in the box.
Στερεοεκλεκτική σύνθεση δραστικών φαρμακευτικών ενώσεων και αναλόγων τους
Creators: name: Γιώτη, Ευθυμία Γ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Δραστικές φαρμακευτικές ενώσεις
Καϊνικό οξύ
γ-αμινοβουτυρικό οξύ
Active pharmaceutical ingredients
Kainic acid
γ-aminobutyric acid

description: Βασικός στόχος της παρούσας διατριβής είναι η σύνθεση μορίων που παρουσιάζουν σημαντικές φαρμακολογικές ιδιότητες, μέσω μιας συνθετικής πορείας οικονομικής και ικανής να εφαρμοσθεί στη βιομηχανική σύνθεση του κάθε μορίου. Συγκεκριμένα, αναφέρεται η προσπάθεια σύνθεσης του pregabalin (1) [(S)-3-(αμινομεθυλο)-5-μεθυλεξανοϊκό οξύ], ενός αναλόγου του γ-αμινοβουτυρικού οξέος. Επίσης, παρουσιάζεται η προσπάθεια σύνθεσης του (-)-α-καϊνικού οξέος (2) [(2S,3S,4S)-3-(καρβοξυμεθυλο)-4-(προπ-1-εν-2-υλ)πυρρολιδινο-2-καρβοξυλικό οξύ], το οποίο είναι ένα φυσικό οξύ. Τέλος, παρουσιάζεται η ολική σύνθεση του entecavir (3) (2-αμινο-9-[(1S,3R,4S)-4-υδροξυ-3-(υδροξυμεθυλο)-2-μεθυλιδενoκυκλοπεντυλ]-6,9,-διυδρο-3Η-πουριν-6-όνη), το οποίο είναι ένα από του στόματος χορηγούμενο αντιικό φάρμακο που χρησιμοποιείται για τη θεραπεία του ιού της ηπατίτιδας Β (HBV).
description: The main objective of this thesis is the composition of molecules that exhibit significant pharmacological properties, through a synthetic track economic and capable applied in industrial composition of each molecule. Specifically, it refers at the synthesis of pregabalin (1) [(S)-3-(aminomethyl)-5-methylexanoic acid], an analogue of gamma-aminobutyric acid. Also it refers at the effort of synthesis of (-)-α-kainic acid (2) (2S,3S,4S)-3-(carboxymethyl)-4-prop-1-en-2-ylpyrrolidine-2-carboxylic acid], which is a natural acid. Finally, it includes the total synthesis of entecavir (3) [2-amino-9-[(1S,3R,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylidenecyclopentyl]-6,9-dihydro-3H-purin-6-one], which is an oral issued antiviral drug used to treat hepatitis B virus (HBV).
Generation of polarized positron beams via collisions of ultrarelativistic electron beams
Creators: name: Song, Huai-Hang
name: Wang, Wei-Min
name: Li, Yu-Tong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A novel scheme is proposed for generating a polarized positron beam via multiphoton Breit-Wheeler process during the collision of a 10 GeV, pC seeding electron beam with the other 1 GeV, nC driving electron beam. The driving beam provides the strong self-generated field, and a suitable transverse deviation distance between two beams enables the field experienced by the seeding beam to be unipolar, which is crucial for realizing the positron polarization. We employ the particle simulation with a Monte-Carlo method to calculate the spin- and polarization-resolved photon emission and electron-positron pair production in the local constant field approximation. Our simulation results show that a highly polarized positron beam with polarization above $40\%$ can be generated in several femtoseconds, which is robust with respect to parameters of two electron beams. Based on an analysis of the influence of $γ$-photon polarization on the polarized pair production, we find that a polarized seeding beam of the proper initial polarization can further improve the positron polarization to $60\%$.
description: 8 pages, 6 figures
Muti-instanton Amplitudes in Type IIB String Theory
Creators: name: Sen, Ashoke
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We compute the normalization of the multiple D-instanton amplitudes in type IIB string theory and show that the result agrees with the prediction of S-duality due to Green and Gutperle.
description: LaTeX file, 7 pages; v2: minor clarifications added; v3: some signs corrected at intermediate steps
Classification of Urban Morphology with Deep Learning: Application on Urban Vitality
Creators: name: Chen, Wangyang
name: Wu, Abraham Noah
name: Biljecki, Filip
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Computers and Society (cs.CY)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: There is a prevailing trend to study urban morphology quantitatively thanks to the growing accessibility to various forms of spatial big data, increasing computing power, and use cases benefiting from such information. The methods developed up to now measure urban morphology with numerical indices describing density, proportion, and mixture, but they do not directly represent morphological features from the human's visual and intuitive perspective. We take the first step to bridge the gap by proposing a deep learning-based technique to automatically classify road networks into four classes on a visual basis. The method is implemented by generating an image of the street network (Colored Road Hierarchy Diagram), which we introduce in this paper, and classifying it using a deep convolutional neural network (ResNet-34). The model achieves an overall classification accuracy of 0.875. Nine cities around the world are selected as the study areas with their road networks acquired from OpenStreetMap. Latent subgroups among the cities are uncovered through clustering on the percentage of each road network category. In the subsequent part of the paper, we focus on the usability of such classification: we apply our method in a case study of urban vitality prediction. An advanced tree-based regression model (LightGBM) is for the first time designated to establish the relationship between morphological indices and vitality indicators. The effect of road network classification is found to be small but positively associated with urban vitality. This work expands the toolkit of quantitative urban morphology study with new techniques, supporting further studies in the future.
Η διδασκαλία των Λατινικών στη Μέση Εκπαίδευση
Creators: name: Ζιώγα, Ιωάννα Γ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Διδασκαλία
Λατινικά
Μέση Εκπαίδευση
Teaching
Latin
Secondary education

description: Στόχος της διατριβής ήταν η αποτύπωση των βασικών χαρακτηριστικών της διδασκαλίας του μαθήματος των Λατινικών στη Μέση Εκπαίδευση αλλά και η διατύπωση προτάσεων για την έξοδο του μαθήματος από την κρίση την οποία διέρχεται σήμερα. Παρουσιάσαμε τη διαδρομή του μαθήματος των Λατινικών στη νεοελληνική εκπαίδευση και στη συνέχεια επιχειρήσαμε να δούμε τι συνέβη στη δευτεροβάθμια εκπαίδευση της Γερμανίας, της Μ. Βρετανίας και της Ιταλίας σε σχέση με τη διδασκαλία των Λατινικών. Ακόμη προσπαθήσαμε να αποτυπώσουμε μια όσο το δυνατόν σαφή και πλήρη εικόνα αναφορικά με τη διδασκαλία των Λατινικών και τα προβλήματα που αντιμετωπίζει σήμερα βασιζόμενοι σε έρευνα μέσω ερωτηματολογίων. Στο τελευταίο μέρος της εργασίας, επιχειρήσαμε να αναδείξουμε λόγους που θα μπορούσαν να καταστήσουν το μάθημα ελκυστικό, ενδιαφέρον και χρήσιμο και προτείναμε ένα ενδεικτικό νέο Διαθεματικό Ενιαίο Πλαίσιο Προγράμματος Σπουδών για το μάθημα των Λατινικών, όπως και συγκεκριμένες παρεμβάσεις στο υπάρχον Αναλυτικό Πρόγραμμα Σπουδών. Τέλος, μετά από μια σύντομη θεωρητική αναφορά σε θέματα διδακτικής μεθοδολογίας, παρουσιάζουμε τέσσερα ενδεικτικά Σχέδια Διδασκαλίας του μαθήματος των Λατινικών, προσπαθώντας να εφαρμόσουμε στην πράξη όσα προηγουμένως προτείναμε θεωρητικά.
description: This dissertation will examine Latin teaching in the Greek secondary education system. While it's ultimate goal is to genuinely present the basic characteristics of Latin teaching as it stands in the Greek school system today, it also aims to make suggestions towards helping Latin come out of the crisis it is going through today. We presented the history of Latin in Greek education and briefly considered Latin teaching in Germany, Great Britain and Italy. Then we tried to give a clearer picture of Latin teaching in greek school system today, by way of original research (questionnaire). In the last chapter -looking toward the future- we attempted to point out the reasons that make learning Latin attractive, interesting and useful and suggested specific interventions for the existing curriculum, in the hopes of creating a more active and meaningful approach for the subject. Finally, this chapter provides a brief theoretical reference to teaching methodology, and closes with four lesson plans, which are aimed at moving theories discussed in this paper to practical classroom application.
eta Chameleontis: abnormal initial mass function or dynamical evolution?
Creators: name: Moraux, E.
name: Lawson, W.
name: Clarke, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Eta Chamaeleontis is a unique young (~9 Myr) association with 18 systems concentrated in a radius of ~35 arcmin, i.e. 1pc at the cluster distance of 97pc. No other members have been found up to 1.5 degrees from the cluster centre. The cluster mass function is consistent with the IMF of other rich young open clusters in the higher mass range but shows a clear deficit of low mass stars and brown dwarfs with no objects below 0.1Msun. The aim of this paper is to test whether this peculiar mass function could result from dynamical evolution despite the young age of the cluster. We performed N-body numerical calculations starting with a log-normal IMF and different initial conditions in terms of number of systems and cluster radius using the code NBODY3. We simulated the cluster dynamical evolution over 10 Myr and compared the results to the observations. We found that it is possible to reproduce eta Cha when starting with a very compact configuration (with Ninit=40 and R0=0.005pc) which suggests that the IMF of the association might not be abnormal. The high initial density might also explain the deficit of wide binaries that is observed in the cluster.
description: 10 pages, 5 figures, accepted by A&A
Η συγκέντρωση των λόγων ανακοπής στην αναγκαστική εκτέλεση: 'Αρθρο 935 ΚΠολΔ
Creators: name: Παπαδοπούλου, Αναστασία Λ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Συγκέντρωση ισχυρισμών
Ανακοπή του αρ. 933 ΚΠολΔ
Άρθρο 935 ΚΠολΔ
Concentrations of claims
Opposition of art. 933 Civil Procedure Code
Article 935 Civil Procedure Code
Civil enforcement procedure

description: Σκοπός της διατριβής ήταν η μελέτη της συγκέντρωσης των λόγων ανακοπής στην αναγκαστική εκτέλεση κατά το άρθρο 935 ΚΠολΔ. Εξετάστηκε αρχικά η δογματική θεώρηση της αρχής συγκέντρωσης στην αναγκαστική εκτέλεση, με αφετηρία την εννοιολογική και λειτουργική προσέγγιση της ίδιας αρχής στην εν γένει πολιτική δίκη και με έμφαση ιδίως στον ειδικό δικαιολογητικό λόγο καθιέρωσής της στη διαδικασία της αναγκαστικής εκτέλεσης. Παρουσιάστηκαν στη συνέχεια διεξοδικά οι κατ’ ιδίαν προϋποθέσεις εφαρμογής του άρθρου 935 ΚΠολΔ στην εκτελεστική διαδικασία, όπως και η εφαρμογή του στο πλαίσιο άλλων διαδικασιών. Επιχειρήθηκε ακόμη, η οριοθέτηση του πεδίου εφαρμογής του άρθρου 935 ΚΠολΔ σε σχέση με τους λοιπούς περιορισμούς που εμποδίζουν την άσκηση της ανακοπής κατά της εκτέλεσης του άρθρου 933 ΚΠολΔ. Τέλος, εκτέθηκαν οι έννομες συνέπειες εφαρμογής του ίδιου πάντοτε άρθρου στην αναγκαστική εκτέλεση και ο έλεγχος της ορθής εφαρμογής του με ένδικα μέσα.
description: The aim of the present thesis was the study of the concentration of opposition grounds in the civil enforcement procedure according to Art. 935 of the Civil Procedure Code. Initially, we examined the dogmatic framework of the concentration of claims principle in the civil procedure, beginning with the conceptual and also functional approach of this principle in the civil trial in general and giving emphasis mainly to the specific justification for its establishment in the civil enforcement procedure. Furthermore, we presented thoroughly the legal requirements demanded for the application of Art. 935 in the civil enforcement procedure as well as we introduced its application within the scope of other procedures. Moreover, we attempted to set the limits of the application area of the aforementioned Art. 935 in relation to other legal limitations acting as a burden while exerting an opposition to the enforcement procedure according to Art. 933 of the Civil Procedure Code. Lastly, we analyzed the legal consequences that arise from the application of Art. 935 in the civil enforcement procedure as well as we examined the review of its legitimate application via legal remedies.
The SLOCC invariant and the residual entanglement for n-qubits
Creators: name: Li, D.
name: Li, X.
name: Huang, H.
name: Li, X.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we find the invariant for $n$-qubits and propose the residual entanglement for $n$-qubits by means of the invariant. Thus, we establish a relation between SLOCC entanglement and the residual entanglement. The invariant and the residual entanglement can be used for SLOCC entanglement classification for $n$-qubits.
description: 22 pages, no figure, lemma 4 and corollary 3 and the conjecture for odd n-qubits in the previous version were deleted because they are not always true
Observational constraints on the braneworld model with brane-bulk energy exchange
Creators: name: Movahed, M. Sadegh
name: Sheykhi, Ahmad
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the viability of the braneworld model with energy exchange between the brane and bulk, by using the most recent observational data related to the background evolution. We show that this energy exchange behaves like a source of dark energy and can alter the profile of the cosmic expansion. The new Supernova Type Ia (SNIa) Gold sample, Supernova Legacy Survey (SNLS) data, the position of the acoustic peak at the last scattering surface from the Wilkinson Microwave Anisotropy Probe (WMAP) observations and the baryon acoustic oscillation peak found in the Sloan Digital Sky Survey (SDSS) are used to constrain the free parameters of this model. To infer its consistency with the age of the Universe, we compare the age of old cosmological objects with what computed using the best fit values for the model parameters. At 68% level of confidence, the combination of Gold sample SNIa, Cosmic Microwave Background (CMB) shift parameter and SDSS databases provide $Ω_m=0.29_{-0.02}^{+0.03}$, $Ω_{A}=-0.71_{-0.03}^{+0.03}$ and $μ=-0.40_{-0.26}^{+0.28}$, hence a spatially flat Universe with $Ω_K=0.00_{-0.04}^{+0.04}$. The same combination with SNLS supernova observation give $Ω_m=0.27_{-0.02}^{+0.02}$, $Ω_{A}=-0.74_{-0.02}^{+0.04}$ and $μ=0.00_{-0.30}^{+0.30}$ consequently provides a spatially flat Universe $Ω_K=-0.01_{-0.03}^{+0.04}$. These results obviously seem to be compatible with the most recent WMAP results indicating a flat Universe.
description: 17 pages and 18 figures, V2: Added comments, references, explained some topics related to the matter power spectrum as a robust constraint, accepted for publication in Mon. Not. R. Astron. Soc
Vacuum birefringence at x-ray free-electron lasers
Creators: name: Karbstein, Felix
name: Sundqvist, Chantal
name: Schulze, Kai S.
name: Uschmann, Ingo
name: Gies, Holger
name: Paulus, Gerhard G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the perspectives of measuring the phenomenon of vacuum birefringence predicted by quantum electrodynamics using an x-ray free-electron laser (XFEL) alone. We devise an experimental scheme allowing the XFEL beam to collide with itself under a finite angle, and thus act as both pump and probe field for the effect. The signature of vacuum birefringence is encoded in polarization-flipped signal photons to be detected with high-purity x-ray polarimetry. Our findings for idealized scenarios underline that the discovery potential of solely XFEL-based setups can be comparable to those involving optical high-intensity lasers. For currently achievable scenarios, we identify several key details of the x-ray optical ingredients that exert a strong influence on the magnitude of the desired signatures.
description: 26 pages, 2 figures; matches journal version
Ο Αρχιμανδρίτης Κλεώπας Ηλίας, κήρυκας και διδάσκαλος του Ευαγγελίου
Creators: name: Natu, Gheorghe,
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Αρχές της Επικοινωνίας
Ευαγγέλιο
Κήρυγμα
Πνευματικός Πατέρας
Principles of Communication
Gospel
Homily
Spiritual Father

description: Ο π. Κλεόπας Ηλίε, υπήρξε ένας επιφανής πνευματικός διδάσκαλος του ρουμανικού λαού στο δεύτερο μισό του 20ου αιώνα, στη διάρκεια των διωγμών του ολοκληρωτικού καθεστώτος. Στην παρούσα διδακτορική παρουσιάζεται η προσωπικότητά του: η παιδεία του, η μοναχική του πολιτεία, το μοναστικό περιβάλλον μέσα στο οποίο έζησε και διαμορφώθηκε πνευματικά, η ηγουμενία του, η αποδοχή του από τον πιστό λαό. Στη συνέχεια καταγράφεται το ομιλητικό του έργο του και οι βιβλιογραφικές ενδείξεις των εκδόσεών των έργων του μαζί με τον κατάλογο των ηχογραφημένων. Τέλος αναλύονται κηρύγματα του π. Κλεόπα που μεταφράστηκαν στα Ελληνικά ως προς τα εξής χαρακτηριστικά: η χρονική διάρκεια, τα βιβλικά, λειτουργικά και πατερικά χωρία, οι θεολογικές και οι ποιμαντικές θέσεις του ομιλητή, καθώς επίσης και τα εκφραστικά τους χαρακτηριστικά. Ο συγγραφέας ακολουθεί την ερμηνευτική παράδοση των μεγάλων Πατέρων της Εκκλησίας, ενώ οι ομιλίες τους στοχεύουν στην πνευματική οικοδομή των ακροατών του και στην εξοικείωσή τους με τη διδασκαλία της Γραφής και των μεγάλων Διδασκάλων της Εκκλησίας, στην οποία ο ίδιος είχε εντρυφήσει.
description: Kleopas Ilie was an eminent spiritual teacher of the Romanian people in the second half of the 20th century during the persecutions carried out by the totalitarian regime.The following doctoral dissertation delves into his personality, his education, his monastic life along with the monastic environment in which he lived, developed spiritually and came to be accepted by his faithful followers.Also his speeches and the bibliographical references of his publications are listed together with a directory of the recorded ones.To conclude his lectures which were translated into greek are thoroughly analysed in connection with the time period, the biblical quotes, his theological and pastoral perspective as well as their expressive characteristics.The writer follows the traditional interpretation of the most important Church Fathers whose speeches aim at the spiritual awakening of the listeners and their familiarity with the writings of the Bible he had so meticulously studied.
Exact longitudinal plasmon dispersion relations for one and two dimensional Wigner crystals
Creators: name: Akhanjee, Shimul
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We derive the exact longitudinal plasmon dispersion relations, $ω(k)$ of classical one and two dimensional Wigner crystals at T=0 from the real space equations of motion, of which properly accounts for the full unscreened Coulomb interactions. We make use of the polylogarithm function in order to evaluate the infinite lattice sums of the electrostatic force constants. From our exact results we recover the correct long-wavelength behavior of previous approximate methods. In 1D, $ω(k) \sim | k |\log ^{1/2} (1/k)$, validating the known RPA and bosonization form. In 2D $ω(k) \sim \sqrt k$, agreeing remarkably with the celebrated Ewald summation result. Additionally, we extend this analysis to calculate the band structure of tight-binding models of non-interacting electrons with arbitrary power law hopping.
description: 4 pages, 1 figure. Important typos and errors fixed, 2D dispersion added
Influence of spin filtering and spin mixing on the subgap structure of I-V characteristics in superconducting quantum point contact
Creators: name: Bobkova, I. V.
name: Bobkov, A. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The effect of spin filtering and spin mixing on the dc electric current for voltage biased magnetic quantum point contact with superconducting leads is theoretically studied. The I-V characteristics are calculated for the whole range of spin filtering and spin mixing parameters. It is found that with increasing of spin filtering the subharmonic step structure of the dc electric current, typical for low-transparency junction and junction without considerable spin filtering qualitatively changes. In the lower voltage region and for small enough spin mixing the peak structure arises. When spin mixing increases the peak subgap structure evolves to the step structure. The voltages where subharmonic gap features are located are found to be sensitive to the value of spin filtering. The positions of peaks and steps are calculated analytically and the evolution of the subgap structure from well-known tunnel limit to the large spin filtering case is explained in terms of multiple Andreev reflection (MAR) processes. In particular, it is found that for large spin filtering the subgap feature at $eV_k$ arises from $2k^{\rm th}$ and $(2k\pm 1)^{\rm th}$ order MAR processes, while in the tunnel limit the step at $eV_n$ is known to result from $n^{\rm th}$ order MAR process.
description: 9 pages, 3 figures
Cocycles and Mañe sequences with an application to ideal fluids
Creators: name: Shvydkoy, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: Exponential dichotomy of a strongly continuous cocycle $\bFi$ is proved to be equivalent to existence of a Mañe sequence either for $\bFi$ or for its adjoint. As a consequence we extend some of the classical results to general Banach bundles. The dynamical spectrum of a product of two cocycles, one of which is scalar, is investigated and applied to describe the essential spectrum of the Euler equation in an arbitrary spacial dimension.
description: 14 pages
Πειραματική και υπολογιστική διερεύνηση της επίπτωσης του Θείου στη λειτουργία παγίδων ΝOx
Creators: name: Μανέτας-Βιολέτας, Χρήστος Σ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Αντιρρύπανση κινητήρων
Παγίδα NOx
Μοντελοποίηση καταλυτικού μετατροπέα
Θείο
Engines emissions control
Lean NOx trap
Catalytic converter modeling
Sulfur

description: Αντικείμενο της διδακτορικής διατριβής είναι η πειραματική και υπολογιστική διερεύνηση των φαινομένων θείωσης και αποθείωσης σε παγίδες οξειδίων του Αζώτου (NOx) κινητήρων Diesel. Η βασική πειραματική μελέτη πραγματοποιήθηκε σε διάταξη συνθετικού καυσαερίου και οδήγησε στην ανάπτυξη ενός μοντέλου το οποίο μπορεί να περιγράψει και να προβλέψει τη λειτουργία της παγίδας NOx καθώς και την επίπτωση του Θείου. Ειδικότερα, προτείνονται μηχανισμοί αντιδράσεων οι οποίοι προβλέπουν τη συμπεριφορά της παγίδας ΝOx, υπό κανονικές συνθήκες λειτουργίας του κινητήρα Diesel κατά τη διάρκεια της οποίας αποθηκεύονται ανταγωνιστικά τα οξείδια του Αζώτου και του Θείου, υπό πλούσιες συνθήκες μείγματος για την αναγέννηση της παγίδας NOx, καθώς και υπό συνθήκες κύκλων φτωχού/πλούσιου μείγματος σε υψηλή θερμοκρασία με στόχο την αποθείωση της παγίδας ΝΟx. Τα παραπάνω ενσωματώθηκαν σε ένα εμπορικό λογισμικό προσομοίωσης μονολιθικού καταλυτικού μετατροπέα, με αποτέλεσμα την ανάπτυξη ενός ολοκληρωμένου μοντέλου παγίδας ΝΟx. Τέλος, το μοντέλο πιστοποιήθηκε σε μια σειρά πειραμάτων θείωσης/αποθείωσης και κύκλων οδήγησης, τα οποία πραγματοποιήθηκαν σε πέδη κινητήρα Diesel αποδεικνύοντας την δυνατότητα χρήσης του μοντέλου σε πρακτικές εφαρμογές.
description: The objective of the doctoral thesis is the experimental and computational investigation of the sulfation and desulaftion phenomena taking place in lean NOx traps, employed in Diesel engines. The basic experimental study was performed on a synthetic gas bench facility and led to the development of a model able to describe and predict the operation of a lean NOx trap and the effect of Sulfur. More specifically, reaction mechanisms were proposed capable of predicting the behavior of the lean NOx trap under normal Diesel engine operation which is characterized by the competitive NOx and Sulfur storage, under rich mode for regenerating the lean NOx trap as well as under lean/rich cycling at high temperature in order to desulfate the lean NOx trap. The reaction mechanisms were coupled with a commercial software able to simulate a monolithic catalytic converter, resulting in the development of a complete lean NOx trap model. Finally, the lean NOx trap model was validated on a series of sulfation/desulfation and driving cycles tests, carried out on a Diesel engine test bench demonstrating the capability of the model towards practical applications.
Discrete quantum Fourier transform in coupled semiconductor double quantum dot molecules
Creators: name: Dong, Ping
name: Yang, Ming
name: Cao, Zhuo-Liang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this Letter, we present a physical scheme for implementing the discrete quantum Fourier transform in a coupled semiconductor double quantum dot system. The main controlled-R gate operation can be decomposed into many simple and feasible unitary transformations. The current scheme would be a useful step towards the realization of complex quantum algorithms in the quantum dot system.
description: 3 pages,2 figures
‘’Εικόν’ αχειροποίητη…’’: η ατέρμονη αναζήτηση του έρωτα και της αγάπης στο έργο του Αλέξανδρου Παπαδιαμάντη
Creators: name: Μπαλούση, Στυλιανή Β.
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Έρωτας
Αγάπη
Φιλοκαλία
Πειρασμός
Eros
Agape
Philokalia
Temptation

description: Ο στόχος της παρούσης διδακτορικής διατριβής είναι η ανάδειξη της βαθύτερης, της πνευματικής διάστασης που έχουν ο έρωτας και η αγάπη στο έργο του Α. Παπαδιαμάντη, φωτισμένη, όπου αυτό είναι εφικτό, από τη διδασκαλία των νηπτικών Πατέρων για το επικίνδυνο «παίγνιο των λογισμών», τον αγώνα κατά των παθών και την καλλιέργεια των θεάρεστων αρετών. Η εργασία απαρτίζεται από δύο εκτεταμένα κεφάλαια. Στο πρώτο, προσεγγίζεται το πολύπλευρο θέμα του έρωτα στα μυθιστορήματα και τα διηγήματα του Αλέξανδρου Παπαδιαμάντη ως ενός διαρκούς και αιμάσσοντος αγώνος κατά των πολύμορφων έξωθεν και έσωθεν πειρασμών και των προσωπικών παθών. Το δεύτερο κεφάλαιο σκοπό έχει να αναδείξει την αγάπη προς τον πλησίον εντός και εκτός του στενού κύκλου της οικογένειας, ως το πλήρωμα των εντολών του Θεού. Η εργασία ολοκληρώνεται με την καταγραφή των συμπερασμάτων που προκύπτουν από την επιμέρους ανάλυση των δύο κεφαλαίων και τα οποία αναδεικνύουν το σημαίνοντα ρόλο και την πνευματική διάσταση του έρωτα και της αγάπης στο παπαδιαμαντικό έργο, όπως επίσης και τη διαλεκτική του σχέση με τη Φιλοκαλία τῶν ἱερῶν Νηπτικῶν.
description: The aim of this doctoral dissertation is to discuss, analyze and evaluate the deep, spiritual dimension of the two main types of love, eros and agape, as depicted in A. Papadiamantis’ work. The role of eros and love throughout his work are enlightened, where possible, by the Neptic Fathers’ teaching on the dangerous “game of thoughts’’, the struggle against human passions and the development of virtues. This thesis consists of two extensive parts. In the first part, the multilateral subject of eros in Papadiamantis’ novels and short stories is discussed as an endless, difficult struggle against the varied external and internal temptations and personal passions. In the second part of the doctoral dissertation, love for fellow man both inside and outside the closer family is emphasized. Model of this love, which embellishes many works of A. Papadiamantis, is the sacrificing love of Jesus Christ for all human beings. The dissertation finishes with the points of conclusion reached through the detailed analysis of the two main parts. These conclusions bring into prominence the significant role of the spiritual dimension of eros and love in Papadiamantis’ work, as well as its dialectical relation to the Philokalia of the Neptic Fathers.
On influence of experimental resolution on the statistical significance of a signal: implication for pentaquark searches
Creators: name: Chekanov, S. V.
name: Levchenko, B. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: An analytical relationship between the statistical significance of an observed signal and the signal width in case of a large background was obtained. It can help to explain why high-energy experiments may have different conclusions on the existence of new particles. We illustrate our approach using the experimental data on searches for the Theta+(1530) pentaquark state. The obtained relationship is also useful for planning of future experiments designed to search for signals of new particles in invariant-mass distributions.
description: 12 pages, 3 eps figures, 2 tables
A Note on the Inapproximability of Correlation Clustering
Creators: name: Tan, Jinsong
Publisher: name: arXiv
Year: 2007
Subjects: subject: Machine Learning (cs.LG)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences
subject: F.2.0

description: We consider inapproximability of the correlation clustering problem defined as follows: Given a graph $G = (V,E)$ where each edge is labeled either "+" (similar) or "-" (dissimilar), correlation clustering seeks to partition the vertices into clusters so that the number of pairs correctly (resp. incorrectly) classified with respect to the labels is maximized (resp. minimized). The two complementary problems are called MaxAgree and MinDisagree, respectively, and have been studied on complete graphs, where every edge is labeled, and general graphs, where some edge might not have been labeled. Natural edge-weighted versions of both problems have been studied as well. Let S-MaxAgree denote the weighted problem where all weights are taken from set S, we show that S-MaxAgree with weights bounded by $O(|V|^{1/2-δ})$ essentially belongs to the same hardness class in the following sense: if there is a polynomial time algorithm that approximates S-MaxAgree within a factor of $λ= O(\log{|V|})$ with high probability, then for any choice of S', S'-MaxAgree can be approximated in polynomial time within a factor of $(λ+ ε)$, where $ε> 0$ can be arbitrarily small, with high probability. A similar statement also holds for $S-MinDisagree. This result implies it is hard (assuming $NP \neq RP$) to approximate unweighted MaxAgree within a factor of $80/79-ε$, improving upon a previous known factor of $116/115-ε$ by Charikar et. al. \cite{Chari05}.
New Parameterization in Muon Decay and the Type of Emitted Neutrino. II
Creators: name: Doi, Masaru
name: Kotani, Tsuneyuki
name: Nishiura, Hiroyuki
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In a previous paper, new sets of parameters to replace the Michel parameters were proposed to analyze data for the muon decay $μ^{+} \to e^{+}ν_{e}\bar{ν_μ}$. Both $(V-A)$ and $(V+A)$ charged currents with finite neutrino mass have been used to study this decay. In the present paper, this parameterization is extended to a more general form, and a method for data analysis (least squares) is discussed for the propose of determining the rate of contribution from the $(V+A)$ current. We find that there is a simple form in which the set of parameters is related primitively to the physical quantities. It is shown that the Michel parameters are one of the other sets that are obtained from this simple form by rearranging one term. We derive the condition to obtain the same information regarding unknown physical quantities in the case that the data are analyzed using these simple and rearranged forms separately. We find that there is some possibility to get different results from these analyses, because the equivalent condition is very delicate and the QED radiative corrections should be treated carefully. We propose a consistent formula for data analysis. It is useful to compare the value obtained in the least squares fit using the simple form with that obtained using the prediction of the standard model, because a large difference is not expected, especially in the case of the Majorana neutrino. Finally, we point out that the method we proposed to determine the type of neutrino in the previous paper is incorrect.
description: 21 pages
Reduction of static field equation of Faddeev model
Creators: name: Hirayama, Minoru
name: Shi, Chang-Guang
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A method to solve the static field equation of the Faddeev model is presented. For an special combination of the concerned field, we adopt a form which is compatible with the field equation and involves two arbitrary complex functions. As a result, the static field equation is reduced to a set of first order partial differential equations.
description: 8 pages
Effects of a pre-inflation radiation-dominated epoch to CMB anisotropy
Creators: name: Wang, I-Chin
name: Ng, Kin-Wang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider that the pre-inflation era is radiation-dominated, transiting smoothly to the inflationary era. We work out in detail the dynamics of inflaton fluctuations across the phase transition and the proper choices of initial vacuum states. It is found that this phase transition can suppress long-wavelength quantum fluctuations of inflaton. This may attribute to the large-scale CMB anisotropy a lower power than predicted in the standard $Λ$CDM model. In constraining this transitional effect by WMAP anisotropy data, we use the WMAP best-fit scale-invariant $Λ$CDM model with the density power spectrum replaced by the one found in this work. We find that the transition occurs at least about 10 e-folds before the comoving scales comparable to our present horizon size cross the Hubble radius during inflation.
description: paper revised,a new figure is added and new references added
OpenDSS: Where it came from and where it is going (Slides)
Creators: Roger C. Dugan
Publisher: name: IEEE
Year: 2023

The OpenDSS program was created in 1997 when the Distribution Planning problem became more complicated due largely to the introduction of distributed generation into the distribution system. Through the 1990?s it became apparent that engineers were going to have to include more than the radial MV feeders to get the right answer. The sub-transmission (HV) system was added, requiring a meshed system solver ? so we adapted methods from a harmonics solver capable of modeling very detailed multiphase power systems. Then we learned that the answer was still not right: the load and generation had to move to account for the coincidence between them. Static power flows gave way to 8760-hour simulations. EPRI made the program open source in 2008 to make its features available to many more researchers and to train the next generation of distribution engineers. In the last 15 years, there have been over 160,000 downloads worldwide. There are no doubt thousands of BS, MS, and Ph.D. students whose projects have been made possible by OpenDSS.

Many features have been added including built-in parallel processing and other support for modern computing architectures. Moving forward, there will be more emphasis on such things as dynamics for microgrid simulations, modern DER and grid conditioning devices, advanced protection/coordination capabilities and better means of accommodating user customization. A tighter connection to the popular Python language and more cross-platform implementations are quite likely.
The OpenDSS program was created in 1997 when the Distribution Planning problem became more complicated due largely to the introduction of distributed generation into the distribution system. Through the 1990?s it became apparent that engineers were going to have to include more than the radial MV feeders to get the right answer. The sub-transmission (HV) system was added, requiring a meshed system solver ? so we adapted methods from a harmonics solver capable of modeling very detailed multiphase power systems. Then we learned that the answer was still not right: the load and generation had to move to account for the coincidence between them. Static power flows gave way to 8760-hour simulations. EPRI made the program open source in 2008 to make its features available to many more researchers and to train the next generation of distribution engineers. In the last 15 years, there have been over 160,000 downloads worldwide. There are no doubt thousands of BS, MS, and Ph.D. students whose projects have been made possible by OpenDSS.

Many features have been added including built-in parallel processing and other support for modern computing architectures. Moving forward, there will be more emphasis on such things as dynamics for microgrid simulations, modern DER and grid conditioning devices, advanced protection/coordination capabilities and better means of accommodating user customization. A tighter connection to the popular Python language and more cross-platform implementations are quite likely.