cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Mary Beard – John North – Simon Price, Religions of Rome. Vol. 1: A history. Vol. 2: A sourcebook
Creators: name: Burkard, Thorsten
name: Riedlberger, Peter
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Mary Beard – John North – Simon Price, Religions of Rome. Vol. 1: A history. Vol. 2: A sourcebook, Cambridge: University Press 1998. XXIV + 454 sowie XIV + 416 Seiten.
description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Οικολογική μελέτη του σπαρακιού(Lemonis gibbosus[L]) στη λίμνη Κερκίνη
Creators: name: Γιαπής, Αλέξανδρος-Ιωάννης
Publisher: name: Aristotle University of Thessaloniki
Year: 2003

description: Η μελέτη αναφέρεται στην οικολογία του σπαρακιού(Lepomis gibbosus[L]) στην τεχνιτή λίμνη Κερκίνη. Μελετήθηκαν τα φυσικοχημικά χαρακτηριστικά, το ζωοπλαγκτό, το βένθος και οι παράγοντες που τα επηρρεάζουν. Στα 1095 άτομα σπαρακιού που συλλέχθηκαν μελετήθηκαν η ηλικία και η αύξηση, η αναπαραγωγή και η διατροφή. Η μέγιστη ηλικία προσδιορίστηκε στα 8 έτη. Η αύξηση σε μήκος και σε βάρος των αρσενικών είναι μεγαλύτερη από των θηλυκών. Το άπειρο μήκος υπολογίστηκε στα 193,73 mn. Ο δείκτης ευρωστίας των θηλυκών είναι μεγαλύτερος από των αρσενικών. Το μήκος των πλευρικών πτερυγίων των αρσενικών βρέθηκε μεγαλύτερο από των θηλυκών. Η ηλικία πρώτης ωριμότητας υπολογίστηκε στα 2,53 χρόνια και η αναπαραγωγική περίοδος διαρκεί από τον Μάιο έως τον Αύγουστο. Η μέση τιμή της απόλυτης γονιμότητας υπολογίστηκε σε 1952 αβγά και της σχετικής γονιμότητας σε 260 αβγά ανά γραμμάριο σωματικού βάρους, ο αριθμός των ειδών τροφής στο διαιτολόγιο του σπαρακιού ήταν 11 είδη. Τα νεαρά άτομα τρέφονται με ζωοπλαγκτικούς οργανισμούς και τα μεγαλύτερα σχεδόν αποκλειστικά με προνύμφες και νύμφες εντόμων
description: The study refers to the ecology of Pumpkinseed(Lepomis gibbosus[L]) at the artificial lake kerkini. The phisicochemical characteristics, the structure of zooplankton and benthos community as well as the factors that effects them were studied. Age and growth, feeding and reproduction of pumbkinseed were studied at 1095 speciments. The maximum age found to be 8 years. It was found out that males overcome female's growth in length and weigth. Asymptotic length was found to be 193,73 mm. Females' condition factor values were higher than the males' pelvic fins were bigger than females'. Age at first maturity was calculated to be 2,53 years and the reproduction period lasts from May to August. Mean absolute fecundity was calculated to be 1,952 eggs and relative fecundity to 260 eggs/g of body weight. The total food species number that concluted to comprise pumpkinseed's diet were eleven. Younger individuals are fed with zooplankton and biggest's diet is based almost completely on larvag and pupae of water insects
Notizie bibliografiche empedoclee: Renato Laurenti, Empedocle / Alain Martin – Oliver Primavesi, L' Empédocle de Strasbourg
Creators: name: Angiò, Francesca
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Renato Laurenti, Empedocle. Storie e Testi 10. M. D'Auria editore, Napoli 1999, pp. 502. Rezension zu: Alain Martin – Oliver Primavesi, L' Empédocle de Strasbourg (P. Strasb. gr. Inv. 1665-1666); introduction, édition et commentaire; with an English Summary. B.N.U.S., Bibliothèque Nationale et Universitaire de Strasbourg. W. de Gruyter, Berlin–New York 1999, pp. 396.
description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Stanley E. Porter (ed.), Classical Rhetoric in the Hellenistic Period 330 B.C. – A.D. 400
Creators: name: Classen, Carl Joachim
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Stanley E. Porter (ed.), Classical Rhetoric in the Hellenistic Period 330 B.C. – A.D. 400, Leiden, New York, Köln 1997, Brill, XV und 901 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Separability of multi-charge black holes in supergravity
Creators: name: Davis, Paul
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper, we show that some five-dimensional rotating black hole solutions of both gauged and ungauged supergravity, with independent rotation parameters and three charges admit separable solutions to the massless Hamilton-Jacobi and Klein-Gordon equations. This allows us to write down a conformal Killing tensor for the spacetime. Conformal Killing tensors obey an equation involving a co-vector field. We find this co-vector field in three specific examples, and also give a general formula for it.
description: 18 pages, Latex. v2: One reference added, minor typos corrected and repeated equation removed. Published version
Peter Funke, Athen in klassischer Zeit
Creators: name: Huttner, Ulrich
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Peter Funke, Athen in klassischer Zeit, München (C.H. Beck) 1999, 128 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Persistent and Transient Blank Field Sources
Creators: name: Treves, A.
name: Campana, S.
name: Chieregato, M.
name: Moretti, A.
name: Nelson, T.
name: Orio, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Blank field sources (BFS) are good candidates for hosting dim isolated neutron stars (DINS). The results of a search of BFS in the ROSAT HRI images are revised. We then focus on transient BFS, arguing that they belong to a rather large population. The perspectives of future research on DINS are then discussed.
description: 3 pages, 0 figures. Paper presented at the Conference "Isolated Neutron Stars: from the interior to the surface", London, April 2006. Astrophysics and Space Science, in press
Solving the Hubble tension without spoiling Big Bang Nucleosynthesis
Creators: name: Huang, Guo-yuan
name: Rodejohann, Werner
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Hubble parameter inferred from cosmic microwave background observations is consistently lower than that from local measurements, which could hint towards new physics. Solutions to the Hubble tension typically require a sizable amount of extra radiation $ΔN^{}_{\rm eff}$ during recombination. However, the amount of $ΔN^{}_{\rm eff}$ in the early Universe is unavoidably constrained by Big Bang Nucleosynthesis (BBN), which causes problems for such solutions. We present a possibility to evade this problem by introducing neutrino self-interactions via a simple Majoron-like coupling. The scalar is slightly heavier than $1~{\rm MeV}$ and allowed to be fully thermalized throughout the BBN era. The rise of neutrino temperature due to the entropy transfer via $ϕ\to ν\overlineν$ reactions compensates the effect of a large $ΔN^{}_{\rm eff}$ on BBN. Values of $ΔN^{}_{\rm eff}$ as large as $0.7$ are in this case compatible with BBN. We perform a fit to the parameter space of the model.
description: 9 pages, 4 figures
Non-hermitian time evolution: from static to parametric instability
Creators: name: Bossart, Aleksi
name: Fleury, Romain
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Eigenmode coalescence imparts remarkable properties to non-hermitian time evolution, culminating in a purely non-hermitian spectral degeneracy known as an exceptional point (EP). Here, we revisit time evolution at the EP and classify two-level non-hermitian Hamiltonians in terms of the Möbius group. We then leverage that classification to study dynamical EP encircling, by applying it to periodically-modulated (Floquet) Hamiltonians. This reveals that Floquet non-hermitian systems exhibit rich physics whose complexity is not captured by an EP-encircling rule. For example, Floquet EPs can occur without encircling and vice-versa. Instead, we show that the elaborate interplay between non-hermitian and modulation instabilities is better understood through the lens of parametric resonance.
New formulas for Stirling-like numbers and Dobinski-like formulas
Creators: name: Kwasniewski, A. K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05A40, 11B73, 81S99

description: Extensions of the $Stirling$ numbers of the second kind and $Dobinski$ -like formulas are proposed in a series of exercises for graduates. Some of these new formulas recently discovered by me are to be found in the source paper $ [1]$. These extensions naturally encompass the well known $q$- extensions. The indicatory references are to point at a part of the vast domain of the foundations of computer science in arxiv affiliation.
description: 9 pages, presented at the Gian-Carlo Rota Polish Seminar, http://ii.uwb.edu.pl/akk/sem/sem_rota.htm
Petra Haß, Der 'locus amoenus' in der antiken Literatur: Zu Theorie und Geschichte eines literarischen Motivs
Creators: name: Kledt, Annette
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Petra Haß, Der 'locus amoenus' in der antiken Literatur: Zu Theorie und Geschichte eines literarischen Motivs, Bamberg (Wissenschaftlicher Verlag Bamberg) 1998. 166 Seiten.
description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Stierdionysos oder Sohn des Poseidon: Zu den Hörnern des Demetrios Poliorketes
Creators: name: Ehling, Kay
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
The fundamental scale of QCD
Creators: name: Simonov, Yu. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: There are several scales in the QCD as the theory of strong interaction: the vacuum gluonic condensate (as the divergence of the dilatation current), the nucleon mass as the basic mass scale in our universe, which is connected to the string tension $σ$, and the perturbative QCD scale $Λ_{\rm QCD}$, which defines the scale of the renormalized perturbative expansions. In this paper we connect all these scales to the vacuum condensate, using the field correlator method, where the string tension is expressed in terms of nonlocal field correlators, which are connected to the local condensates, while the perturbative $Λ_V$ is connected to $σ$ in the framework of the Background Perturbation Theory (BPT). We also demonstrate how the IR singularities and IR renormalons disappear in BPT making the resulting theory internally consistent.
description: 17 pages,3 figures
Unrecht tun ist schlimmer als Unrecht leiden (Sokrates bei Platon, Gorg. 473a)
Creators: name: Sprute, Jürgen
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Quantum Mechanical Relations for the Energy, Momentum and Velocity of Single Photons in Dispersive Media
Creators: name: Buenker, Robert J.
name: Muino, Pedro L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Attempts to explain the refraction of light in dispersive media in terms of a photon or "corpuscular" model have heretofore been unable to account for the observed decrease in the speed of light as it passes from air into a region of higher refractive index n such as water or glass. In the present work it is argued on the basis of the quantum mechanical relations p = k and E = h omega that the energy of photons satisfies the equation E = pc/n. It is possible to obtain an exact prediction of the observed speed of the photons in a given medium by application of Hamilton's equations of motion to the above formula, but at the same time to conclude, in agreement with the arguments of Newton and other classical physicists, that the photon momentum increases in direct proportion to n, thereby producing the well-known bending of light rays toward the normal when entering water from air. The corresponding relativistic particle theory of light indicates that the potential V encountered by the photons in a given medium is attractive for n > 1 and is momentum-dependent, which suggests the microscopic interactions responsible for the refraction of light are non-Coulombic in nature and are instead akin to the spin-orbit and orbit-orbit terms in the Breit-Pauli Hamiltonian for electrons moving in an external field. The present theory concludes that the reason photons are slowed down upon entering water from air is that their relativistic mass p/v increases faster with n than does their momentum, which in turn requires that Einstein's famous E = mc^2 formula does not hold for light dispersion because the energy of the photons is expected to be the same in both media.
Εκπαιδευτική τεχνολογία :: σχεδίαση και ανάπτυξη εκπαιδευτικών συστημάτων προσαρμοστικών υπερμέσων βασισμένων στο γνωστικό στυλ των εκπαιδευομένων
Creators: name: Τριανταφύλλου, Ευάγγελος
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Προσαρμοστικά εκπαιδευτικά περιβάλλοντα
Προσαρμοστικά υπερμέσα
Γνωστικό στυλ
Adaptive educational systems
Adaptive hypermedia
Cognitive style

description: Η διατριβή μελετά διεξοδικά τα εκπαιδευτικά συστήματα υπερμέσων και προτείνει μια νέα διάσταση προσαρμοστικότητας με βάση τα ιδιαίτερα χαρακτηριστικά του εκπαιδευόμενου. Συγκεκριμένα προτείνεται η σχεδίαση και ανάπτυξη ενός εκπαιδευτικού συστήματος προσαρμοστικών υπερμέσων το οποίο περιλαμβάνει προσαρμογές τόσο στο γνωστικό επίπεδο όσο και στο γνωστικό στυλ του εκπαιδευόμενου με στόχο τη βελτίωση των μαθηματικών αλληλεπιδράσεων και αποτελεσμάτων
description: This Thesis deals with adaptive educational systems amd suggests a new dimension for adaptivity based on individual characteristics of students. Specifically, this thesis describes the design and development of an adaptive educational system that includes accomodations for cognitive styles in order ti improve student interactions and learning outcomes
Laves phase crystal analysis (LaCA): Atomistic identification of lattice defects in C14 and C15 topologically close-packed phases
Creators: name: Xie, Zhuocheng
name: Chauraud, Dimitri
name: Bitzek, Erik
name: Korte-Kerzel, Sandra
name: Guénolé, Julien
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The identification of defects in crystal structures is crucial for the analysis of atomistic simulations. Many methods to characterize defects that are based on the classification of local atomic arrangement are available for simple crystalline structures. However, there is currently no method to identify both, the crystal structures and internal defects of topologically close-packed (TCP) phases such as Laves phases. We propose a new method, Laves phase Crystal Analysis (LaCA), to characterize the atomic arrangement in Laves crystals by interweaving existing structural analysis algorithms. The new method can identify the polytypes C14 and C15 of Laves phases, typical crystallographic defects in these phases, and common deformation mechanisms such as synchroshear and non-basal dislocations. Defects in the C36 Laves phase are detectable through deviations from the periodic arrangement of the C14 and C15 structures that make up this phase. LaCA is robust and extendable to other TCP phases.
description: 24 pages, 8 figures, 1 table, supplementary material
Characterization of mammographic masses using a gradient-based segmentation algorithm and a neural classifier
Creators: name: Delogu, P.
name: Fantacci, M. E.
name: Kasae, P.
name: Retico, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: The computer-aided diagnosis system we developed for the mass characterization is mainly based on a segmentation algorithm and on the neural classification of several features computed on the segmented mass. Mass segmentation plays a key role in most computerized systems. Our technique is a gradient-based one, showing the main characteristic that no free parameters have been evaluated on the dataset used in this analysis, thus it can directly be applied to datasets acquired in different conditions without any ad-hoc modification. A dataset of 226 masses (109 malignant and 117 benign) has been used in this study. The segmentation algorithm works with a comparable efficiency both on malignant and benign masses. Sixteen features based on shape, size and intensity of the segmented masses are analyzed by a multi-layered perceptron neural network. A feature selection procedure has been carried out on the basis of the feature discriminating power and of the linear correlations interplaying among them. The comparison of the areas under the ROC curves obtained by varying the number of features to be classified has shown that 12 selected features out of the 16 computed ones are powerful enough to achieve the best classifier performances. The radiologist assigned the segmented masses to three different categories: correctly-, acceptably- and non-acceptably-segmented masses. We initially estimated the area under ROC curve only on the first category of segmented masses (the 88.5% of the dataset), then extending the dataset to the second sub-class (reaching the 97.8% of the dataset) and finally to the whole dataset, obtaining Az = 0.805+-0.030, 0.787+-0.024 and 0.780+-0.023, respectively.
description: 18 pages, 7 figures
Zur Skulpturenausstattung einer Hotellobby in Sousse (Tunesien)
Creators: name: Schmid, Stephan G.
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Extended space and time correlations in strongly magnetized plasmas
Creators: name: Vidal, Keith R.
name: Baalrud, Scott D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Molecular dynamics simulations are used to show that strong magnetization significantly increases the space and time scales associated with interparticle correlations. The physical mechanism responsible is a channeling effect whereby particles are confined to move along narrow cylinders with a width characterized by the gyroradius and a length characterized by the collision mean free path. The predominant interaction is $180^\circ$ collisions at the ends of the collision cylinders, resulting in a long-range correlation parallel to the magnetic field. Its influence is demonstrated via the dependence of the velocity autocorrelation functions and self-diffusion coefficients on the domain size and run time in simulations of the one-component plasma. A very large number of particles, and therefore domain size, must be used to resolve the long-range correlations, suggesting that the number of charged particles in the collection must increase in order to constitute a plasma. Correspondingly, this effect significantly delays the time it takes to reach a diffusive regime, in which the mean square displacement of particles increases linearly in time. This result presents challenges for connecting measurements in non-neutral and ultracold neutral plasma experiments, as well as molecular dynamics simulations, with fluid transport properties due to their finite size.
description: 14 pages, 11 figures
A $p$-arton Model for Modular Cusp Forms
Creators: name: Dutta, Parikshit
name: Ghoshal, Debashis
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Mathematics (math.GM)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 11M99, 11Z05, 11F11, 11F37

description: We propose to associate to a modular form (an infinite number of) complex valued functions on the $p$-adic numbers $\mathbb{Q}_p$ for each prime $p$. We elaborate on the correspondence and study its consequence in terms of the Mellin transforms and the $L$-functions related to the forms. Further we discuss the case of products of Dirichlet $L$-functions and their Mellin duals, which are convolution products of $\vartheta$-series. The latter are intriguingly similar to non-holomorphic Maass forms of weight zero as suggested by their Fourier coefficients.
description: 1+23 pages, 1 appendix, v2: typos corrected, references added
Φλεγμαίνοντα ὀνόματα und kein Impetus
Creators: name: Schmitt, Tassilo
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Die Datenbank der attischen Grabreliefs – Ein neues Hilfsmittel für ikonographische und sozialgeschichtliche Forschungen
Creators: name: Bergemann, Johannes
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
Binarity as the Origin of Long Secondary Periods in Red Giant Stars
Creators: name: Soszyński, I.
name: Olechowska, A.
name: Ratajczak, M.
name: Iwanek, P.
name: Skowron, D. M.
name: Mróz, P.
name: Pietrukowicz, P.
name: Udalski, A.
name: Szymański, M. K.
name: Skowron, J.
name: Gromadzki, M.
name: Poleski, R.
name: Kozłowski, S.
name: Wrona, M.
name: Ulaczyk, K.
name: Rybicki, K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Long secondary periods (LSPs), observed in a third of pulsating red giant stars, are the only unexplained type of large-amplitude stellar variability known at this time. Here we show that this phenomenon is a manifestation of a substellar or stellar companion orbiting the red giant star. Our investigation is based on a sample of about 16,000 well-defined LSP variables detected in the long-term OGLE photometric database of the Milky Way and Magellanic Clouds, combined with the mid-infrared data extracted from the NEOWISE-R archive. From this collection, we selected about 700 objects with stable, large-amplitude, well-sampled infrared light curves and found that about half of them exhibit secondary eclipses, thus presenting an important piece of evidence that the physical mechanism responsible for LSPs is binarity. Namely, the LSP light changes are due to the presence of a dusty cloud orbiting the red giant together with the companion and obscuring the star once per orbit. The secondary eclipses, visible only in the infrared wavelength, occur when the cloud is hidden behind the giant. In this scenario, the low-mass companion is a former planet that has accreted a significant amount of mass from the envelope of its host star and grown into a brown dwarf.
description: 9 pages, 4 figures
Nonextensivity in Geological Faults?
Creators: name: França, G. S.
name: Vilar, C. S.
name: Silva, R.
name: Alcaniz, J. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Geological fault systems, as the San Andreas fault (SAF) in USA, constitute typical examples of self-organizing systems in nature. In this paper, we have considered some geophysical properties of the SAF system to test the viability of the nonextensive models for earthquakes developed in [Phys. Rev. E {\bf 73}, 026102, 2006]. To this end, we have used 6188 earthquakes events ranging in the magnitude interval $2 < m < 8$ that were taken from the Network Earthquake International Center catalogs (NEIC, 2004-2006) and the Bulletin of the International Seismological Centre (ISC, 1964-2003). For values of the Tsallis nonextensive parameter $q \simeq 1.68$, it is shown that the energy distribution function deduced in above reference provides an excellent fit to the NEIC and ISC SAF data.
description: 9 pages, 1 figure, standard LaTeX file
Shock and shear layer interaction in a confined supersonic cavity flow
Creators: name: Karthick, S. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The impinging shock of varying strengths on the free shear layer in a confined supersonic cavity flow is studied numerically using the detached-eddy simulation. The resulting spatiotemporal variations are analyzed between the different cases using unsteady statistics, $x-t$ diagrams, spectral analysis, and modal decomposition. A cavity of length to depth ratio $[L/D]=2$ at a freestream Mach number of $M_\infty = 1.71$ is considered to be in a confined passage. Impinging shock strength is controlled by changing the ramp angle ($θ$) on the top-wall. The static pressure ratio across the impinging shock ($p_2/p_1$) is used to quantify the impinging shock strength. Five different impinging shock strengths are studied by changing the pressure ratio: $1.0,1.2,1.5,1.7$ and $2.0$. As the pressure ratio increases from 1.0 to 2.0, the cavity wall experiences a maximum pressure of 25% due to shock loading. At [$p_2/p_1]=1.5$, fundamental fluidic mode or Rossiter's frequency corresponding to $n=1$ mode vanishes whereas frequencies correspond to higher modes ($n=2$ and $4$) resonate. Wavefronts interaction from the longitudinal reflections inside the cavity with the transverse disturbances from the shock-shear layer interactions is identified to drive the strong resonant behavior. Due to Mach-reflections inside the confined passage at $[p_2/p_1]=2.0$, shock-cavity resonance is lost. Based on the present findings, an idea to use a shock-laden confined cavity flow in an enclosed supersonic wall-jet configuration as passive flow control or a fluidic device is also demonstrated.
description: 16 Figures. Relevant multimedia views and supplementary videos are embedded in the pdf itself. Article yet to be submitted to a journal
Problems and hopes in nonsymmetric gravity
Creators: name: Janssen, Tomas
name: Prokopec, Tomislav
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the linearized nonsymmetric theory of gravitation (NGT) within the background of an expanding universe and near a Schwarzschild mass. We show that the theory always develops instabilities unless the linearized nonsymmetric lagrangian reduces to a particular simple form. This form contains a gauge invariant kinetic term, a mass term for the antisymmetric metric-field and a coupling with the Ricci curvature scalar. This form cannot be obtained within NGT. Based on the linearized lagrangian we know to be stable, we consider the generation and evolution of quantum fluctuations of the antisymmetric gravitational field (B-field) from inflation up to the present day. We find that a B-field with a mass m ~ 0.03(H_I/10^(13)GeV)^4 eV is an excellent dark matter candidate.
description: 9 pages, 1 figure. Based on two talks by the authors at the 2nd International Conference on Quantum Theories and Renormalization Group in Gravity and Cosmology (IRGAC) 2006, Barcelona
Neues zur Überlieferung der Synagoge des Symeon (Paris. gr. 2552, Paris. Suppl. gr. 1238, Vatic. gr. 2226)
Creators: name: Nickau, Klaus
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 3 (2000): Göttinger Forum für Altertumswissenschaft
On the small maximal flows in first passage percolation
Creators: name: Théret, Marie
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K35

description: We consider the standard first passage percolation on $\mathbb{Z}^{d}$: with each edge of the lattice we associate a random capacity. We are interested in the maximal flow through a cylinder in this graph. Under some assumptions Kesten proved in 1987 a law of large numbers for the rescaled flow. Chayes and Chayes established that the large deviations far away below its typical value are of surface order, at least for the Bernoulli percolation and cylinders of certain height. Thanks to another approach we extend here their result to higher cylinders, and we transport this result to the model of first passage percolation.
description: 11 pages, 2 figure; added references, changes on part 4.1
Persistence of periodic traveling waves and Abelian integrals
Creators: name: Gasull, Armengol
name: Geyer, Anna
name: Mañosa, Víctor
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: Primary: 35C07, 34CO8. Secondary: 34C23, 34C25, 37C27

description: It is well known that the existence of traveling wave solutions (TWS) for many partial differential equations (PDE) is a consequence of the fact that an associated planar ordinary differential equation (ODE) has certain types of solutions defined for all time. In this paper we address the problem of persistence of TWS of a given PDE under small perturbations. Our main results deal with the situation where the associated ODE has a center and, as a consequence, the original PDE has a continuum of periodic traveling wave solutions. We prove that the TWS that persist are controlled by the zeroes of some Abelian integrals. We apply our results to several famous PDE, like the Ostrovsky, Klein-Gordon, sine-Gordon, Korteweg-de Vries, Rosenau-Hyman, Camassa-Holm, and Boussinesq equations.
description: 20 pages
Η αρχιεπισκοπή Πρώτης Ιουστινιανής: (συμβουλή στη διερεύνηση του προβλήματος)
Creators: name: Κωνσταντίνου ή Τέγου-Στεργιάδου, Ευανθία
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Ιλλυρικό
Επαρχότητα, Βικαριάτο Θεσ/νικης
Διπλωματική ανάλυση Χρυσοβούλλου
Ψευδοϊουστινιάνειο Χρυσόβουλλο
Ελληνικός κώδικας του Εσκοριάλ-Ισπανία
Illyricum
Bizantinische Diplomatik
Luge Justinian Chisobulle
Griechische codex von Escorial Spain

description: Η δημιουργία της αρχιεπισκοπής της Πρώτης Ιουστινιανής πρέπει να συσχετιστεί με τη βυζαντινή πολιτική η οποία είχε επιδράσεις στη διαμόρφωση των εκκλησιαστικών δομλών και στη θέσπιση διατάξεων, που καθόριζαν κάθε φορά το χάρτη της Νοτιανατολικής Ευρώπης. Η πρώτη Ιουστινιανλη υπήρξε πολύ βραχύβια πρωτεύουσα του Ιλλυρικού ή η μεταφορά της δεν πραγματοποιήθηκε ποτέ. Ο τίτλος Αρχιεπισκοπή Αχριδίου Πρώτης Ιουστινιανής και πάσης Βουλγαρίας άρχισε να ακμάζει τον ΙΑ αιώνα όταν αρχιεπίσκοπος της ήταν ο Θεοφύλακτος. Κορυφώθηκε στο τέλος του ΙΒ' με αρχές ΙΓ' αιώνα όταν αρχιεπίσκοπός της ήταν ο Δ. Χωματιανός και συντηρήθηκε μέχρι τον 17ο και 18ο αιώνα, όταν αρχιεπίσκοπό της ήταν οι Ζωσιμάς(1686), Ιωάσαφ(1746), Διονύσιος(1753) και καταργήθηκε το 1767, έτος συνένωσή της αρχιεπισκοπής Αχρίδος με το Οικουμενικό Πατριαρχείο.
description: The estabilichment of the archbishopic of Prim a Justiniana should be correlated with the Byzantine policy that had affected the zelinement of the ecclesiastic structures and the enacting of dispositions that each time determined the map of south eastern europe. Prim a Justiniana was the most chort-livel capital of the Illyric or her transfer never took place. The little Prima Justiniana Archbishopric of Achrida and All Bulgaria begun to flourish in the 11th century when Archbishop was Theophylactos. It reached the highest pitch in the end of the 12th and at the begging of the 13th century, when Archbishop was Dimitrios Chomatianos and it maintained until the 18th century when Archbishops were, Zosimas(1686), Joasaph(1746) und Dionysos(1753) and Prima Justiniana was a brogated in 1767 the year that the Archbishopic of Achrida was united with the ecumenical Patriarchate.
Epitaxial growth and magnetic characterization of EuSe thin films with various crystalline orientations
Creators: name: Wang, Ying
name: Liu, Xinyu
name: Bac, Seul-Ki
name: Furdyna, Jacek K.
name: Assaf, Badih A.
name: Zhukovskyi, Maksym
name: Orlova, Tatyana
name: Dilley, Neil R
name: Rokhinson, Leonid P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report different growth modes and corresponding magnetic properties of thin EuSe films grown by molecular beam epitaxy on BaF2, Pb1-xEuxSe, GaAs, and Bi2Se3 substrates. We show that EuSe growth predominantly in (001) orientation on GaAs(111) and Bi2Se3, but along (111) crystallographic direction on BaF2 (111) and Pb1-xEuxSe (111). High-resolution transmission electron microscopy measurements reveal an abrupt and highly crystalline interface for both (001) and (111) EuSe films. In agreement with previous studies, ordered magnetic phases include antiferromagnetic, ferrimagnetic, and ferromagnetic phases. In contrast to previous studies, we found strong hysteresis for the antiferromagnetic-ferrimagnetic transition. An ability to grow epitaxial films of EuSe on Bi2Se3 and of Bi2Se3 on EuSe enables further investigation of interfacial exchange interactions between various phases of an insulating metamagnetic material and a topological insulator.
description: 19pages,13 figures
Kinetics of leaching galena concentrates with ferric fluosilicate solution
Creators: name: Chen, Alan Airong
Publisher: name: University of British Columbia
Year: 2008

description: A new hydrometallurgical leaching process, which dissolves galena concentrates with acidified ferric fluosilicate solution, has been investigated for the selective extraction of lead and zinc from the galena concentrates. The process of leaching galena concentrates avoids the generation of sulfur dioxide and lead dust emissions and is capable of treating complex sulfide and low-grade flotation concentrates. The leaching of Pine Point galena concentrates by ferric fluosilicate solutions was studied under various experimental conditions in the temperature range 20 to 95°C. Temperature had a pronounced effect on the dissolution of the concentrates. The rates of lead leaching are very rapid over the temperature range 38 to 95°C. The reaction rates for the dissolution of galena were found to be controlled by surface chemical reaction. The apparent activation energy of the leaching reaction was calculated to be equal to 62.1 kJ/mole which is consistent with a chemical reaction control mechanism. The SEM micrographs show that the elemental sulfur reaction product formed in the leaching of the galena concentrate is fairly rough and appears to be quite porous on the particle surface. It is a non-protective product layer. The fluosilicate lixiviant may dissociate at high temperatures. Some white precipitates were found in the leached residue which were generated in the course of reactions at above 65°C. The initial contents of Pb2+, H+, and Fe3+ in the lixiviant do not have a significant effect on the lead extraction under the experimental conditions in the study. The insensitivity of the leaching rates to the leaching variables probably arises from an electrochemical mechanism involving adsorption of ferric ions on cathodic sites, isolated from anodic sites where the leaching takes place. During the course of the galena leaching, zinc extraction is much lower than lead extraction, especially at temperatures below 65°C. Separation of lead and zinc by selective leaching seems to be feasible and effective. Therefore, the ferric fluosilicate leaching system appears to have great potential to treat both conventional lead sulfide concentrates and complex sulfide concentrates, such as the McArthur River concentrates. The solubility of lead salt in fluosilicate medium is relatively high, and easily meets the concentration requirement for the subsequent aqueous electrolysis operation.
Unconventional hysteretic transition in a charge density wave
Creators: name: Lv, B. Q.
name: Zong, Alfred
name: Wu, D.
name: Rozhkov, A. V.
name: Fine, Boris V.
name: Chen, Su-Di
name: Hashimoto, Makoto
name: Lu, Dong-Hui
name: Li, M.
name: Huang, Y. -B.
name: Ruff, Jacob P. C.
name: Walko, Donald A.
name: Chen, Z. H.
name: Hwang, Inhui
name: Su, Yifan
name: Shen, Xiaozhe
name: Wang, Xirui
name: Han, Fei
name: Po, Hoi Chun
name: Wang, Yao
name: Jarillo-Herrero, Pablo
name: Wang, Xijie
name: Zhou, Hua
name: Sun, Cheng-Jun
name: Wen, Haidan
name: Shen, Zhi-Xun
name: Wang, N. L.
name: Gedik, Nuh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Hysteresis underlies a large number of phase transitions in solids, giving rise to exotic metastable states that are otherwise inaccessible. Here, we report an unconventional hysteretic transition in a quasi-2D material, EuTe4. By combining transport, photoemission, diffraction, and x-ray absorption measurements, we observed that the hysteresis loop has a temperature width of more than 400 K, setting a record among crystalline solids. The transition has an origin distinct from known mechanisms, lying entirely within the incommensurate charge-density-wave (CDW) phase of EuTe4 with no change in the CDW modulation periodicity. We interpret the hysteresis as an unusual switching of the relative CDW phases in different layers, a phenomenon unique to quasi-2D compounds that is not present in either purely 2D or strongly-coupled 3D systems. Our findings challenge the established theories on metastable states in density wave systems, pushing the boundary of understanding hysteretic transitions in a broken-symmetry state.
Quantum learning by measurement and feedback
Creators: name: Gammelmark, Soren
name: Molmer, Klaus
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose an approach to quantum computing in which quantum gate strengths are parametrized by quantum degrees of freedom, and the capability of the quantum computer to perform desired tasks is monitored and gradually improved by successive feedback modifications of the coupling strength parameters. Our proposal aims at experimental implementation, scalable to computational problems too large to be simulated theoretically, and we demonstrate feasibility of our proposal with simulations on search and factoring algorithms.
description: 6 pages, 5 figures
Ανάλυση δομής, σταθμολογικές απιτήσεις και δυνατότητες αξιοποίησης του πλάτανου(Platanus orientalis)
Creators: name: Πιπίνης, Ηλίας Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Παραποτάμια δάση
Αλλουβιακά εδάφη
Riparian forests
Alluvial soils

description: Ο Platanus orientalis είναι ένα άριστο πρόσκοπο είδος που καταλαμβάνει αλλουβιανά εδάφη και κυρίως τους κώνους απόθεσης των ρευμάτων. Οι γνώσεις μας για τα παραποτάμια δάση που σχηματίζει στην Ελλάδα είναι περιορισμένες. Αντικείμενο της παρούσας εργασίας είναι η μελέτη της δομής των δασών αυτών, των παραγόντων που την καθορίζουν καθώς και η εκτίμηση της ποικιλότητας ως προς την αύξηση σε ύψος μεταξύ φυσικών πληθυσμών του. Ως περιοχή έρευνας επιλέχθηκαν οι πλατανεώνες της Δυτικής Κεντρικής Ελλάδας. Τα αποτελέσματα της έρευνας έδειξαν πως πρόκειται για ένα ταχυαυξές είδος που σχηματίζει κυρίως συστάδες ομήλικες δομής. Εμφανίζεται σς αλλουβιακά εδάφη με ελαφρά μηχανική σύσταση και αλκαλική αντίδραση. Γενικά είναι εδάφη φτωχά. Η περιεκτικότητά τους σε οργανική ουσία και η μηχανική σύσταση εξαρτιούνται από την απόσταση και την υψομετρική διαφορά από την κοίτη. Η παραγωγική δυνατότητα των συστάδων του εξαρτάται από το βάθος της υπόγειας στάθμης νερού και από την κοκκομετρική σύσταση του εδάφους. Από το πείραμα δοκιμής πληθυσμών σε κοινό περιβάλλον διαπιστώθηκε ότι υπάρχει γενετική ποικιλότητα για τον χαρακτήρα "ύψος" σε επίπεδο προέλευσης, συστάδων και ατόμων
description: Platanus orientalis is an excellent pioneer species that occupies olluvial soils and mainly alluvial fans of streams. The knowledge about the riparian forests that it forms in Greece is limited. The objective of this research was to study the structure of these forests, the factors of the site that determine it and moreover the evaluation of genetic variation between natural populations. The study was carried out in riparian forests of central Greece. The results showed that Pl. orientalis is a fast-growing species and the most stands that forms are even-aged. It occupies alluvial soils with soils with light texture and alkaline reaction. The content of organic matter and texture of these soils depend on the distance and elevation above the channel bed. Productivity of Pl. orientalis stands depends on the level of ground water and the texture of soil. The results of the tested populations in the same environment exhitited genetin variation for the character "height" in level provenance, stands and families
Quantum spin compass models in 2D electronic topological metasurfaces
Creators: name: Nigmatulin, Fedor
name: Shelykh, Ivan
name: Iorsh, Ivan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider a metasurface consisting of a square lattice of cylindrical antidots in a two-dimensional topological insulator (2DTI). Each antidot supports a degenerate Kramer's pair of eigenstates formed by the helical topological edge states. We show that the on-site Coulomb repulsion leads to the onset of the Mott insulator phase in the system in a certain range of experimentally relevant parameters. Intrinsic strong spin-orbit coupling characteristic for the 2DTI supports a rich class of the emerging low-energy spin Hamiltonians which can be emulated in the considered system, which makes it an appealing solid state platform for quantum simulations of strongly correlated electron systems.
Constraining alternatives to the Kerr black hole
Creators: name: Shaikh, Rajibul
name: Pal, Kunal
name: Pal, Kuntal
name: Sarkar, Tapobrata
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The recent observation of the shadow of the supermassive compact object M87$^*$ by the Event Horizon Telescope (EHT) collaboration has opened up a new window to probe the strong gravity regime. In this paper, we study shadows cast by two viable alternatives to the Kerr black hole, and compare them with the shadow of M87$^{*}$. The first alternative is a horizonless compact object (HCO) having radius $r_0$ and exterior Kerr geometry. The second one is a rotating generalisation of the recently obtained one parameter ($r_0$) static metric by Simpson and Visser. This latter metric, constructed by using the Newman-Janis algorithm, is a special case of a parametrised rotating non-Kerr geometry obtained by Johannsen. Here, we constrain the parameter $r_0$ of these alternatives using the results from M87$^{*}$ observation. We find that, for the mass, inclination angle and the angular diameter of the shadow of M87$^{*}$ reported by the EHT collaboration, the maximum value of the parameter $r_0$ must be in the range $2.54r_{+}\leq r_{0,max}\leq 3.51r_{+}$ for the dimensionless spin range $0.5\leq a_{*}\leq 0.94$, with $r_{+}$ being the outer horizon radius of the Kerr black hole at the corresponding spin value. We conclude that these black hole alternatives having $r_0$ below this maximum range (i.e. $r_0\leq r_{0,max}$) is consistent with the size and deviation from circularity of the observed shadow of M87$^{*}$.
description: 16 Pages, LaTeX
Biomarkers in disk-averaged near-UV to near-IR Earth spectra using Earthshine observations
Creators: name: Hamdani, Slim
name: Arnold, Luc
name: Foellmi, C.
name: Berthier, J.
name: Billeres, M.
name: Briot, D.
name: François, P.
name: Riaud, P.
name: Schneider, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyse the detectability of vegetation on a global scale on Earth's surface. Considering its specific reflectance spectrum showing a sharp edge around 700 nm, vegetation can be considered as a potential global biomarker. This work, based on observational data, aims to characterise and to quantify this signature in the disk-averaged Earth's spectrum. Earthshine spectra have been used to test the detectability of the "Vegetation Red Edge" (VRE) in the Earth spectrum. We obtained reflectance spectra from near UV (320 nm) to near IR (1020 nm) for different Earth phases (continents or oceans seen from the Moon) with EMMI on the NTT at ESO/La Silla, Chile. We accurately correct the sky background and take into account the phase-dependent colour of the Moon. VRE measurements require a correction of the ozone Chappuis absorption band and Rayleigh plus aerosol scattering. Results : The near-UV spectrum shows a dark Earth below 350 nm due to the ozone absorption. The Vegetation Red Edge is observed when forests are present (4.0% for Africa and Europe), and is lower when clouds and oceans are mainly visible (1.3% for the Pacific Ocean). Errors are typically $\pm0.5$, and $\pm1.5$ in the worst case. We discuss the different sources of errors and bias and suggest possible improvements. We showed that measuring the VRE or an analog on an Earth-like planet remains very difficult (photometric relative accuracy of 1% or better). It remains a small feature compared to atmospheric absorption lines. A direct monitoring from space of the global (disk-averaged) Earth's spectrum would provide the best VRE follow-up.
description: Accepted for publication in A&A. 9 pages, 8 figures
Lukian von Samosata: Alexandros oder der Lügenprophet. Eingel., hrsg., übers. u. erkl. v. Ulrich Victor
Creators: name: Oesterheld, Christian
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Lukian von Samosata: Alexandros oder der Lügenprophet. Eingel., hrsg., übers. u. erkl. v. Ulrich Victor. Religions in the Graeco-Roman World 132. Leiden usw.: Brill, 1997. VIII, 180 S., 3 Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 4 (2001): Göttinger Forum für Altertumswissenschaft
Towards a Nonperturbative Foundation of the Dipole Picture: II. High Energy Limit
Creators: name: Ewerz, Carlo
name: Nachtmann, Otto
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This is the second of two papers in which we study real and virtual photon-proton scattering in a nonperturbative framework. In the first paper we have identified the leading contributions to this process at high energies and have derived expressions for them which take into account the renormalisation of the photon-quark-antiquark vertex. In the present paper we investigate the approximations and assumptions that are necessary to obtain the dipole model of high energy scattering from the results derived in the first paper. We discuss the gauge invariance of different contributions to the scattering amplitude and point out some subtleties related to gauge invariance in the correct definition of a perturbative photon wave function. As a phenomenological consequence of the dipole picture we derive a bound on the ratio of the cross sections for longitudinally and transversely polarised photons. This bound is independent of any particular model for the dipole-proton cross section and allows one to test the validity of the assumptions leading to the dipole picture in particular at low photon virtualities. We conclude that the naive dipole model formula should be supplemented by two additional terms which can potentially become large at small photon virtualities.
description: 59 pages, 14 figures; v2: minor changes, reference added, matches journal version