cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Weak Energy Condition and the Expansion History of the Universe
Creators: name: Sen, A. A.
name: Scherrer, Robert J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We examine flat models containing a dark matter component and an arbitrary dark energy component, subject only to the constraint that the dark energy satisfies the weak energy condition. We determine the constraints that these conditions place on the evolution of the Hubble parameter with redshift, H(z), and on the scaling of the coordinate distance with redshift, r(z). Observational constraints on H(z) are used to derive an upper bound on the current matter density. We demonstrate how the weak energy condition constrains fitting functions for r(z).
description: 5 pages, 3 figures, references and discussion added
Brief an Bonifacius Amerbach
Creators: name: Amerbach, Basilius
Publisher: name: [s.n.]
Year: 1523

description: von [Basilius Amerbach]
description: Lateinisch
description: Verzeichnung=Description=Inventaire August 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Thermal state entanglement in harmonic lattices
Creators: name: Anders, Janet
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the entanglement properties of thermal states of the harmonic lattice in one, two and three dimensions. We establish the value of the critical temperature for entanglement between neighbouring sites and give physical reasons. Further sites are shown to be entangled only due to boundary effects. Other forms of entanglement are addressed in the second part of the paper by using the energy as witness of entanglement. We close with a comprehensive diagram showing the different phases of entanglement versus complete separability and propose techniques to swap and tune entanglement experimentally.
description: 9 pages, 4 figures
Προγραμματισμός των αρδεύσεων με εφαρμογή μαθηματικών μοντέλων και συστήματα γεωγραφικών πληροφοριών
Creators: name: Γεωργούσης, Χαράλαμπος
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Irrigation scheduling
Richards equation
SWBACROS
Προγραμματισμός αρδεύσεων

description: Σε αυτή τη διατριβή παρουσιάζεται ένα λογισμικό που δίνει τη δυνατότητα στους διαχειριστές ενός αρδευτικού δικτύου να προβλέπουν τις αρδευτικές ανάγκες των καλλιεργειών. Ο πυρήνας τους είναι το μαθηματικό μοντέλο SWBARCOS για τη λύση της εξίσωσης RICHARDS. Η χωρική μεταβλητότητα των υδραυλικών παραμέτρων του εδάφους λαμβάνεται υπόψη με τη βοήθεια της θεωρίας της κλιμάκωσης. Το μαθηματικό μοντέλο ενσωματώνεται με τη βοήθεια κώδιακ σε VB6 και VBA στο περιβάλλον του ESRI ARCMAP Q.X. Η ενσωμάτωση αυτή δίνει στο χρήστη τη δυνατότητα να παρακολουθεί τόσο τις μεταβολές της εδαφικής υγρασίας όσο και των αρδευτικών αναγκών μέσα από ένα φιλικό περιβάλλον. Τα αποτελέσματα δείχνουν πως το λογισμικό μπορεί να αποτελέσει ένα περιβαλλοντικό εργαλείο ώστε οι διαχειριστές ενός αρδευτικού δικτύου(α) να κατανέμουν το νερό του δικτύου πιο αποδοτικά και (β) να παρέχουν σαφείς οδηγίες προς τους παραγωγούς πάνω στο πότε και πόσο να αρδεύσουν
description: A software that provides to irrigation network managers the ability to predict the crops' irrigation needs is presented in this thesis. Its core is the model SWBACROS which solves the RICHARDS equation soil hydraulic parameters' spatial variability is considered using the scaling theory. Finally the mathematical model is intergrated in ESRI ARCMAP 9.x using VB6 and VBA parts of code. This integration enables the analysis of soil hydraulic parameters and offers to the user the ability to monitor changes of both soil water and irrigation needs through a user frienly environment. The results show that this software can serve as an environmental tool that can assist irrigation network managers to (a) distribute the network's water more efficiently and (b) provide clear irrigation advice to farmers on when and how much to irrigate
Brief an Bonifacius Amerbach
Creators: name: Amerbach, Bruno
Publisher: name: [s.n.]
Year: 1519

description: von Bruno Amerbach
description: Lateinisch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. II. Band. - Basel : Verl. der Universitätsbibliothek, 1943, Nr. 654
description: Verzeichnung=Description=Inventaire August 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Ταφικές πρακτικές και κοινωνίες της εποχής του Χαλκού στη Δυτική Μακεδονία: τα νεκροταφεία στην κοιλάδα και στις Γούλες Κοζάνης
Creators: name: Ζιώτα, Χριστίνα Κ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Πολιτισμικοί κανόνες
Τελετουργική πρακτική
Ατομικότητα/συλλογική ταυτότητα
Cultural rules
Ritual practice
Individuality/Communal identity

description: Στόχος της εργασίας είναι να παρουσιάσει τα αποτελέσματα της ανασκαφικής έρευνας σε δύο οργανωμένα προϊστορικά νεκροταφεία της ύστερης πρώιμης και της μέσης εποχής Χαλκού στο νομό Κοζάνης. Δεν αποτελεί αναλυτική δημοσίευση του υλικού, αλλά επικεντρώνεται στις ταφικές πρακτικές και κοινωνικές συνιστώσες, που επηρεάζουν τη μεταχείριση των νεκρών. Η μελέτη των 256 συνολικά τάφων επιχειρεί να αναδείξει τις βασικές αρχές, που διέπουν την κοινωνικά αποδεκτή αντιμετώπιση του θανάτου σε κάθε νεκροταφείο. Δεν φιλοδοξεί να ανασυστήσει τη δομή των αντίστοιχων κοινωνιών, αλλά να σκιαγραφήσει την ιδιαίτερη εκδοχή κάθε κοινωνίας, όπως προβάλλεται στο τελετουργικό πλαίσιο της ταφής. Διερευνά επίσης το ενδεχόμενο να ενεργοποιούνται ποικίλες στρατηγικές με στόχο τον επαναπροσδιορισμό ρόλων και σχέσεων στην κοινωνική πραγματικότητα. Καταλήγει με την ιστορική θεώρηση των προϊστορικών ταφικών πρακτικών στη Δ. Μακεδονία
description: The aim of this thesis is to present the results of an excavation at two organized prehistoric cemeteries of the early and middle Bronze Age in the prefecture of Kozani. It is not a detailed publication of the finds but rather it focuses on the burial practices and the social formations which determine the treatment of the dead. The study of a total of 256 tombs attempts to present the basic principles which rule the socially accepted treatment of death in each cemetery. It does not mean to recreate the structure of each respective sociaty, but to outline the different interpretation of each society as it appears in the context of the burial rituals. Furthermore it examines the likelihood that a variety of social strategies are used to redefine the roles and relations in the social reality. It ends with the historical considerations of the prehistoric burial practices in W. Macedonia
Ghosts, Instabilities, and Superluminal Propagation in Modified Gravity Models
Creators: name: De Felice, Antonio
name: Hindmarsh, Mark
name: Trodden, Mark
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider Modified Gravity models involving inverse powers of fourth-order curvature invariants. Using these models' equivalence to the theory of a scalar field coupled to a linear combination of the invariants, we investigate the properties of the propagating modes. Even in the case for which the fourth derivative terms in the field equations vanish, we find that the second derivative terms can give rise to ghosts, instabilities, and superluminal propagation speeds. We establish the conditions which the theories must satisfy in order to avoid these problems in Friedmann backgrounds, and show that the late-time attractor solutions are generically afflicted by superluminally propagating tensor or scalar modes.
description: 17 pages, 1 figure, uses RevTeX. Added a few comments. Changed the figure
Supersymmetric Bethe Ansatz and Baxter Equations from Discrete Hirota Dynamics
Creators: name: Kazakov, Vladimir
name: Sorin, Alexander
name: Zabrodin, Anton
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We show that eigenvalues of the family of Baxter Q-operators for supersymmetric integrable spin chains constructed with the gl(K|M)-invariant $R$-matrix obey the Hirota bilinear difference equation. The nested Bethe ansatz for super spin chains, with any choice of simple root system, is then treated as a discrete dynamical system for zeros of polynomial solutions to the Hirota equation. Our basic tool is a chain of Backlund transformations for the Hirota equation connecting quantum transfer matrices. This approach also provides a systematic way to derive the complete set of generalized Baxter equations for super spin chains.
description: Minor changes: misprints fixed, references added
Brief an Bonifacius Amerbach
Creators: name: Rechberger, Jacob
Publisher: name: [s.n.]
Year: 1515

description: von Jacob Rechberger
description: Deutsch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. II. Band. - Basel : Verl. der Universitätsbibliothek, 1943, Nr. 517
description: Verzeichnung=Description=Inventaire August 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
The Interstellar N/O Abundance Ratio: Evidence for Local Infall?
Creators: name: Knauth, David C.
name: Lauroesch, James T.
name: Meyer, David M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Sensitive measurements of the interstellar gas-phase oxygen abundance have revealed a slight oxygen deficiency ($\sim$ 15%) toward stars within 500 pc of the Sun as compared to more distant sightlines. Recent $FUSE$ observations of the interstellar gas-phase nitrogen abundance indicate larger variations, but no trends with distance were reported due to the significant measurement uncertainties for many sightlines. By considering only the highest quality ($\geq$ 5 $σ$) N/O abundance measurements, we find an intriguing trend in the interstellar N/O ratio with distance. Toward the seven stars within $\sim$ 500 pc of the Sun, the weighted mean N/O ratio is 0.217 $\pm$ 0.011, while for the six stars further away the weighted mean value (N/O = 0.142 $\pm$ 0.008) is curiously consistent with the current Solar value (N/O = 0.138$^{+0.20}_{-0.18}$). It is difficult to imagine a scenario invoking environmental (e.g., dust depletion, ionization, etc.) variations alone that explains this abundance anomaly. Is the enhanced nitrogen abundance localized to the Solar neighborhood or evidence of a more widespread phenomenon? If it is localized, then recent infall of low metallicity gas in the Solar neighborhood may be the best explanation. Otherwise, the N/O variations may be best explained by large-scale differences in the interstellar mixing processes for AGB stars and Type II supernovae.
description: accepted for publication in the Astrophysical Journal Letters
Empirical Color Transformations Between SDSS Photometry and Other Photometric Systems
Creators: name: Jordi, Katrin
name: Grebel, Eva K.
name: Ammon, Karin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present empirical color transformations between the Sloan Digital Sky Survey (SDSS) ugriz photometry and Johnson-Cousins UBVRI system and Becker's RGU system, respectively. Owing to the magnitude of data that is becoming available in the SDSS photometric system it is particularly important to be able to convert between this new system and traditional photometric systems. Unlike earlier published transformations we based our calculations on stars actually measured by the SDSS with the SDSS 2.5-m telescope. The photometric database of the SDSS provides in a sense a single-epoch set of 'tertiary standards' covering more than one quarter of the sky. Our transformations should facilitate their use to easily and reliably derive the corresponding approximate Johnson-Cousins or RGU magnitudes. The SDSS survey covers a number of areas that were previously established as standard fields in the Johnson-Cousins system, in particular, fields established by Landolt and by Stetson. We used these overlapping fields to create well-photometered star samples on which our calculated transformations are based. For the RGU photometry we used fields observed in the framework of the new Basel high-latitude field star survey. We calculated empirical color transformations between SDSS photometry and Johnson-Cousins UBVRI and Becker's RGU system. For all transformations we found linear relations to be sufficient. Furthermore we showed that the transformations between the Johnson-Cousins and the SDSS system have a slight dependence on metallicity.
description: 11 pages, 7 figures, Accepted for publication in A&A
Brief an Bonifacius Amerbach
Creators: name: Amerbach, Bruno
Publisher: name: [s.n.]
Year: 1519

description: von Bruno Amerbach
description: Lateinisch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. II. Band. - Basel : Verl. der Universitätsbibliothek, 1943, Nr. 651
description: Verzeichnung=Description=Inventaire August 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
MCMC analysis of WMAP3 and SDSS data points to broken symmetry inflaton potentials and provides a lower bound on the tensor to scalar ratio
Creators: name: Destri, C.
name: de Vega, H. J.
name: Sanchez, N. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We perform a MCMC (Monte Carlo Markov Chains) analysis of the available CMB and LSS data (including the three years WMAP data) with single field slow-roll new inflation and chaotic inflation models. We do this within our approach to inflation as an effective field theory in the GinsburgLandau spirit with fourth degree trinomial potentials in the inflaton field phi.We derive explicit formu- lae and study in detail the spectral index ns of the adiabatic fluctuations the ratio r of tensor to scalar fluctuations and the running index dn_s/dln k. We use these analytic formulas as hard constraints on n_s and r in the MCMC analysis.Our analysis differs in this crucial aspect from previous MCMC studies in the literature involving the WMAP3 data. Our results are as follow: (i) The data strongly indicate the breaking (whether spontaneous or explicit) of the phi -> -phi symmetry of the inflaton potentials both for new and for chaotic inflation.(ii)Trinomial new inflation naturally satisfies this requirement and provides an excellent fit to the data.(iii)Trinomial chaotic inflation produces the best fit in a very narrow corner of the parameter space.(iv) The chaotic symmetric trinomial potential is almost certainly ruled out(at 95% CL).In tri- nomial chaotic inflation the MCMC runs go towards a potential in the boundary of the parameter space and which ressembles a spontaneously symmetry broken potential of new inflation. (v) The above results and further physical analysis here lead us to conclude that new inflation gives the best description of the data.(vi) We find a lower bound for r within trinomial new inflation potentials r > 0.016 (95% CL) and r > 0.049 (68% CL). (vii) The preferred new inflation trinomial potential is a double well, even function of the field yielding as most probable values: n_s ~ 0.958, r ~ 0.055. Such r could be observed soon.
description: 26 pages, 9 figures. Expanded and improved version to appear in Phys. Rev. D
Strong electron-phonon interaction in multiband superconductors
Creators: name: Dolgov, O. V.
name: Golubov, A. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss the effects of anisotropy on superconducting critical temperature and order parameter in a strongly coupled regime. The multiband representation is used as a model for anisotropy. We show that strong coupling effects in multiband superconductors lead to pair-breaking due to interband coupling because soft phonon modes play the same role as usual impurities. This effect makes the order parameters in different bands equal to each other and limits the upper bound on critical temperature.
description: 5 pages, 1 figure
Brief an Bonifacius Amerbach
Creators: name: Amerbach, Bruno
Publisher: name: [s.n.]
Year: 1516

description: von Bruno Amerbach
description: Lateinisch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. II. Band. - Basel : Verl. der Universitätsbibliothek, 1943, Nr. 570
description: Verzeichnung=Description=Inventaire August 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Φυσικές επιστήμες για την εκπαίδευση κριτικά σκεπτόμενων & ενεργών πολιτών
Creators: name: Καρύδας, Απόστολος Κ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Αναλυτικά προγράμματα
Κριτική/δημιουργική σκέψη
Curriculum
Critical, reflective, creative thought

description: Η διατριβή αποτελείται από δύο μέρη. Στο πρώτο μέρος: (α) κατασκευάσαμε ένα ερευνητικό πλαίσιο, το ICMAS, κατάλληλο για τη μελέτη εκπαιδευτικών προγραμμάτων Φυσικών Επιστημών (ΦΕ), (β) διερευνήσαμε τη σχέση της Κοινωνικής Θεωρίας με την εκπαίδευση των ΦΕ και (γ) παρουσιάσαμε τα βασικά χαρακτηριστικά της νεοφιλελεύθερης – νεοσυντηρητικής πολιτικής στην εκπαίδευση. Τις τρεις αυτές εργασίες τις χρησιμοποιήσαμε, ακολούθως, για να αναλύσουμε ορισμένα διεθνή προγράμματα Επιστημονικού και Τεχνολογικού Αλφαβητισμού, με σκοπό να αναδείξουμε τις κοινωνικές, ιδεολογικές και παιδαγωγικές τους προθέσεις. Στο δεύτερο μέρος της διατριβής αναπτύξαμε μία εναλλακτική πρόταση αλφαβητισμού στις ΦΕ και την τεχνολογία, για το σχεδιασμό της οποίας υιοθετήσαμε βασικές αρχές της Κριτικής Κοινωνικής Θεωρίας και Οικολογίας, καθώς και ιδέες της Προοδευτικής Παιδαγωγικής και της Παιδαγωγικής της Ανθρώπινης Δράσης
description: The dissertation consists of two parts. The first part deals with the following tasks׃ (a) the design of a research model, ICMAS, suitable for the analysis of Science Education programs, (b) the investigation of the relation between Science Education and Social Theory and (c) the indication of the basic characteristics of the, so called, neoliberal- neoconservative politics in Science education. The above works permitted, subsequently, the critical analysis of several international Science & Technology Literacy Programs, whose conclusions led to the demonstration of the social, ideological and educational orientations of the specific programs. In the second part of the dissertation we expounded an alternative Science and Technology Literacy proposal for the design of which, we adopted basic principles of the Critical Social Theory and Ecology along with the basic ideas of the Progressive Pedagogy and Human Action Pedagogy as well
Brief an Bonifacius Amerbach
Creators: name: Amerbach, Bruno
Publisher: name: [s.n.]
Year: 1516

description: von Bruno Amerbach
description: Lateinisch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. II. Band. - Basel : Verl. der Universitätsbibliothek, 1943, Nr. 571
description: Verzeichnung=Description=Inventaire August 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Halo Shapes, Dynamics and Environment
Creators: name: Plionis, Manolis
name: Ragone, Cinthia
name: Basilakos, Spyros
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the hierarchical structure formation model cosmic halos are supposed to form by accretion of smaller units along anisotropic direction, defined by large-scale filamentary structures. After the epoch of primary mass aggregation (which depend on the cosmological model), violent relaxation processes will tend to alter the halo phase-space configuration producing quasi-spherical halos with a relatively smooth density profiles. Here we attempt to investigate the relation between halos shapes, their environment and their dynamical state. To this end we have run a large ($L=500 h^{-1}$ Mpc, $N_{p}=512^3$ particles) N-body simulation of a flat low-density cold dark matter model with a matter density $Ω_{\rm m}=1-Ω_Λ=0.3$, Hubble constant $H_{\circ}=70$ km s$^{-1}$ Mpc$^{-1}$ and a normalization parameter of $σ_{8}=0.9$. The particle mass is $m_{\rm p}\ge 7.7\times 10^{10} h^{-1} M_{\odot}$ comparable to the mass of one single galaxy. The halos are defined using a friends-of-friend algorithm with a linking length given by $l=0.17\barν$ where $\barν$ is the mean density. This linking length corresponds to an overdensity $ρ/ρ_{\rm mean}\simeq 200$ at the present epoch ($z=0$) and the total number of halos with more than 130 particles ($M>3 \times 10^{13} h^{-1} M_{\odot}$) is 57524.
description: To be published in "Groups Of Galaxies In The Nearby Universe", held in Chile, December 2005, edited by I.Saviane, V.Ivanov and J.Borissova. Springer-Verlag series "ESO Astrophysics Symposia"
Cassini States with Dissipation: Why Obliquity Tides Cannot Inflate Hot Jupiters
Creators: name: Fabrycky, Daniel C.
name: Johnson, Eric T.
name: Goodman, Jeremy
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Some short-period exoplanets (hot Jupiters) are observed by their transits to have anomalously large radii. It has been suggested that these planets are in a resonance involving persistent misalignment and synchronous precession of their spin and orbital angular momenta, a Cassini state, and that the attendant tidal heating inflates the planet. We argue against this. Using explicit tidal integrations, we show that although an oblique Cassini state can dissipate many times the rotational energy of the planet, the rate of dissipation must be much less than hypothesized. Dissipation causes the planetary spin to lie at an angle to the plane containing the orbital and total angular momenta. If dissipation is too rapid, this angle becomes so large that Cassini equilibrium is lost. A separate consideration limits the total energy that can be extracted from the orbit. The source of the torque on the orbit, either an oblique parent star or an inclined third body, aligns with the orbit as it absorbs the angular momentum shed by the planet. Alignment removes the orbital precession required by the Cassini state. In combination with observational bounds on the mass and semimajor axis of a possible second planet and with bounds on the stellar rotation and obliquity, these constraints make it very unlikely that obliquity tides can be the explanation for inflated hot Jupiters, especially HD 209458b.
description: Submitted to ApJ. 33 pages in preprint format
Identification of the Infrared Counterpart to a Newly Discovered X-ray Source in the Galactic Center
Creators: name: Mikles, V. J.
name: Eikenberry, S. S.
name: Muno, M. P.
name: Bandyopadhyay, R. M.
name: Patel, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present first results of a campaign to find and identify new compact objects in the Galactic Center. Selecting candidates from a combination of Chandra and 2MASS survey data, we search for accretion disk signatures via infrared spectroscopy. We have found the infrared counterpart to the Chandra source CXO J174536.1-285638, the spectrum of which has strong Br-gamma and HeI emission. The presence of CIII, NIII, and HeII indicate a binary system. We suspect that the system is some form of high-mass binary system, either a high-mass X-ray binary or a colliding wind binary.
description: 11 pages, 6 figures, ApJ accepted, 2006
The Dust Properties of Eight Debris Disk Candidates as Determined by Submillimeter Photometry
Creators: name: Williams, Jonathan P.
name: Andrews, Sean M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The nature of far-infrared dust emission toward main sequence stars, whether interstellar or circumstellar, can be deduced from submillimeter photometry. We present JCMT/SCUBA flux measurements at 850 microns toward 8 stars with large photospheric excesses at 60-100 microns. 5 sources were detected at 3-sigma or greater significance and one was marginally detected at 2.5-sigma. The inferred dust masses and temperatures range from 0.033 to 0.24 Earth masses and 43-65 K respectively. The frequency behavior of the opacity, tau_nu ~ nu^beta, is relatively shallow, beta < 1. These dust properties are characteristic of circumstellar material, most likely the debris from planetesimal collisions. The 2 non-detections have lower temperatures, 35-38 K and steeper opacity indices, beta > 1.5, that are more typical of interstellar cirrus. The confirmed disks all have inferred diameters > 2'', most lie near the upper envelope of the debris disk mass distribution, and 4 are bright enough to be feasible for high resolution imaging.
description: accepted by ApJ
Brief an Bonifacius Amerbach
Creators: name: Amerbach, Bruno
Publisher: name: [s.n.]
Year: 1518

description: von Bruno Amerbach
description: Lateinisch
description: Druck: Ulrich Zasius : ein Beitrag zur Geschichte der Rechtswissenschaft im Zeitalter der Reformation / Roderich von Stintzing. - Basel : Schweighauser, 1857, S.368
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. II. Band. - Basel : Verl. der Universitätsbibliothek, 1943, Nr. 625
description: Verzeichnung=Description=Inventaire August 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
D-branes in Unoriented Non-critical Strings and Duality in SO(N) and Sp(N) Gauge Theories
Creators: name: Ashok, Sujay K.
name: Murthy, Sameer
name: Troost, Jan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We exhibit exact conformal field theory descriptions of SO(N) and Sp(N) pairs of Seiberg-dual gauge theories within string theory. The N=1 gauge theories with flavour are realized as low energy limits of the worldvolume theories on D-branes in unoriented non-critical superstring backgrounds. These unoriented backgrounds are obtained by constructing exact crosscap states in the SL(2,R)/U(1) coset conformal field theory using the modular bootstrap method. Seiberg duality is understood by studying the behaviour of the boundary and crosscap states under monodromy in the closed string parameter space.
description: 23 pages, 2 figures
Search for gravitational wave radiation associated with the pulsating tail of the SGR 1806-20 hyperflare of 27 December 2004 using LIGO
Creators: name: The LIGO Scientific Collaboration
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have searched for Gravitational Waves (GWs) associated with the SGR 1806-20 hyperflare of 27 December 2004. This event, originating from a Galactic neutron star, displayed exceptional energetics. Recent investigations of the X-ray light curve's pulsating tail revealed the presence of Quasi-Periodic Oscillations (QPOs) in the 30 - 2000 Hz frequency range, most of which coincides with the bandwidth of the LIGO detectors. These QPOs, with well-characterized frequencies, can plausibly be attributed to seismic modes of the neutron star which could emit GWs. Our search targeted potential quasi-monochromatic GWs lasting for tens of seconds and emitted at the QPO frequencies. We have observed no candidate signals above a pre-determined threshold and our lowest upper limit was set by the 92.5 Hz QPO observed in the interval from 150 s to 260 s after the start of the flare. This bound corresponds to a (90% confidence) root-sum-squared amplitude h_rssdet^90% = 4.5e-22 strain Hz^-1/2 on the GW waveform strength in the detectable polarization state reaching our Hanford (WA) 4 km detector. We illustrate the astrophysical significance of the result via an estimated characteristic energy in GW emission that we would expect to be able to detect. The above result corresponds to 7.7e46 erg (= 4.3e-8 M_sun c^2), which is of the same order as the total (isotropic) energy emitted in the electromagnetic spectrum. This result provides a means to probe the energy reservoir of the source with the best upper limit on the GW waveform strength published and represents the first broadband asteroseismology measurement using a GW detector.
description: 13 pages, 2 tables, 3 figures, submitted to Phys. Rev. D
Brief an Johannes Amerbach
Creators: name: Amerbach, Bonifacius
Publisher: name: [s.n.]
Year: 1507

description: von Bonifacius Amerbach
description: Lateinisch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. I. Band. - Basel : Verl. der Universitätsbibliothek, 1942, Nr. 350
description: Verzeichnung=Description=Inventaire September 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Brief an Johannes Amerbach
Creators: name: Amerbach, Bonifacius
Publisher: name: [s.n.]
Year: 1507

description: von Bonifacius Amerbach
description: Lateinisch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. I. Band. - Basel : Verl. der Universitätsbibliothek, 1942, Nr. 351
description: Verzeichnung=Description=Inventaire September 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Brief an Basilius Amerbach
Creators: name: Amerbach, Bonifacius
Publisher: name: [s.n.]
Year: 1534

description: von Bonifacius Amerbach
description: Lateinisch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. IV. Band. - Basel : Verl. der Universitätsbibliothek, 1953, Nr. 1801
description: Verzeichnung=Description=Inventaire September 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
On the consistency of the peculiar GRBs 060218 and 060614 with the Ep,i - Eiso correlation
Creators: name: Amati, L.
name: Della Valle, M.
name: Frontera, F.
name: Malesani, D.
name: Guidorzi, C.
name: Montanari, E.
name: Pian, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze and discuss the position of GRB 060218 and GRB 060614 in the Ep,i - Eiso plane. GRB 060218 is important because of its similarity with GRB 980425, the proto-type event of the GRB-SN connection. While GRB 980425 is an outlier of the Ep,i - Eiso correlation, we find that GRB 060218 is fully consistent with it. This evidence, combined with the `chromatic' behavior of the afterglow light curves, is at odds with the hypothesis that GRB 060218 was a `standard' GRB seen off-axis and supports the existence of a class of truly sub--energetic GRBs. GRB 060614 is a peculiar event not accompanied by a bright Supernova. Based on published spectral information, we find that also this event is consistent with the Ep,i - Eiso correlation. We discuss the implications of our results for the rate of sub--energetic GRBs, the GRB/SN connection and the properties of the newly discovered sub-class of long GRBs not associated with bright Supernovae. We have included in our analysis other recent GRBs with clear evidence (or clear no evidence) of associated SNe.
description: 9 pages, 4 figures, FINAL REVISED VERSION (added Figure 4 and short GRBs in Figure 1; minor changes and style corrections applied; references updated), submitted to A&A on November 25, 2006
Constructing 5-chromatic unit distance graphs embedded in the Euclidean plane and two-dimensional spheres
Creators: name: Voronov, Vsevolod
name: Neopryatnaya, Anna
name: Dergachev, Eugene
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: This paper is devoted to the development of algorithms for finding unit distance graphs with chromatic number greater than 4, embedded in a two-dimensional sphere or plane. Such graphs provide a lower bound for the Nelson-Hadwiger problem on the chromatic number of the plane and its generalizations to the case of the sphere. A series of 5-chromatic unit distance graphs on 64513 vertices embedded into the plane is constructed. Unlike previously known examples, these graphs do not contain the Moser spindle as a subgraph. The construction of 5-chromatic graphs embedded in a sphere at two values of the radius is given. Namely, the 5-chromatic unit distance graph on 372 vertices embedded into the circumsphere of an icosahedron with a unit edge length, and the 5-chromatic graph on 972 vertices embedded into the circumsphere of a great icosahedron are constructed.
description: 20 pages, 12 figures. Fixed a few minor mistakes. Changes suggested by the reviewers have been made. Simplified some formulas
Evidence of spatial inhomogeneity near the onset of magnetically induced insulating state in superconducting thin films
Creators: name: Vicente, C. L.
name: Qin, Yongguang
name: Yoon, Jongsoo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Non-monotonic differential resistance (dV/dI) is observed in magnetically induced insulating films which exhibit apparent superconductor-metal-insulator transitions in the low temperature limit; at low bias currents the nonlinear transport is insulator-like while at high bias currents it is characteristic of metallic phase. The non-monotonic dV/dI may be evidence that the insulating state consists of metallic domains connected by point contacts (insulating gaps), implying that spatial inhomogeneities play a dominant role in determining the nature of the apparent metal-insulator transition.
description: 4 pages, 3 figures
Pogonatum inflexum Sande Lac.
Creators: name: Zhao, Wei
name: Wang, Zhaoming
name: Zheng, Lina
name: Naren, Gaowa
name: He, Qiang
name: Han, Wei
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Plantae
Bryophyta
Bryopsida
Polytrichales
Polytrichaceae
Pogonatum
Pogonatum inflexum

description: Pogonatum inflexum (Lindb.) Sande Lac.
Distribution
China, North Korea and Japan (Wu and Jia 2004).
description: Published as part of Zhao, Wei, Wang, Zhaoming, Zheng, Lina, Naren, Gaowa, He, Qiang & Han, Wei, 2024, A step forward in botanical exploration with three new Polytrichaceae records from Tibet, China, pp. e 133971 in Biodiversity Data Journal 12 on page e133971, DOI: 10.3897/BDJ.12.e133971
Jitter radiation in gamma-ray bursts and their afterglows: emission and self-absorption
Creators: name: Workman, Jared
name: Morsony, Brian
name: Lazzati, Davide
name: Medvedev, Mikhail
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Relativistic electrons moving into a highly tangled magnetic field emit jitter radiation. We present a detailed computation of the jitter radiation spectrum, including self-absorption, for electrons inside Weibel-like shock generated magnetic fields. We apply our results to the case of the prompt and afterglow emission of gamma-ray bursts. We show that jitter emission can reproduce most of the observed features with some important differences with respect to standard synchrotron, especially in the frequency range between the self-absorption and the peak frequency. We discuss the similarities and differences between jitter and synchrotron and discuss experiments that can disentangle the two mechanisms.
description: 12 pages, 7 postscript figures. Figures, discussion, and references updated. Accepted for publication in MNRAS
Exact expression for Drude conductivity in one-dimension with an arbitrary potential
Creators: name: Schulz, Michael
name: Trimper, Steffen
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: An exact expression for the Drude conductivity in one dimension is derived under the presence of an arbitrary potential. In getting the conductivity the influence of the electric field on the crystal potential is taken into account. This coupling leads to a systematic deformation of the potential and consequently to a significant modification of the charge transport. The corrections to the conventional Drude conductivity are determined by the configurational part of the partition function. The activation energy for the conductivity process is expressed by a combination of the free energy of the underlying equilibrium system. The electric current is calculated in the linear response regime by solving the Smoluchowski equation. The steady state solution differs significantly from the equilibrium distribution. In case of a tight binding potential the conductivity offers corrections depending on the amplitude of the potential. As a further application we discuss nanocontacts with piecewise constant potentials. The electric conductivity is corrected by the potential height.
description: 12 pages, 3 figures
How Do Government Programs and Policies Influence Consumers' Food Choices?
Creators: name: Zellner, James A.
name: Morrison, Rosanna Mentzer
name: Zellner, James A.
name: Morrison, Rosanna Mentzer
Publisher: name: Unknown
Year: 1988
Subjects: Agricultural and Food Policy
Food Consumption/Nutrition/Food Safety

description: Federal economic and regulatory policies and programs affect food choices by influencing the supply and demand for food as well as by giving food to needy consumers. Food assistance programs aim to improve the diets of the poor. Farm commodity programs indirectly affect nutrient consumption by influencing the availability or price of food. Still other policies control information about food, whether through advertising, research, or public education, thus influencing consumers' perceptions about food and their nutrition. This report presents an overview of some of the Federal programs that affect food choices and hence nutrition, including food and income assistance, farm commodity programs, and food safety and quality regulations.
Modele d'evaluation des dispositifs et des techniques d'evaluation certificative en langues etrangeres
Creators: name: Delhaye, Olivier P.
Publisher: name: Aristotle University of Thessaloniki
Year: 2006
Subjects: Διδακτική
Πιστοποίηση
Δεξιότητες επικοινωνίας
Didactics
Certification
Competences of communication

description: Η έρευνα έχει σκοπό την ανάπτυξη συστήματος κριτηρίων για την αξιολόγηση των συστημάτων πιστοποίησης γλωσσομάθειας. Ως γνωστόν αυτά τα συστήματα δεν ακολουθούν ορισμένη νόρμα ούτε ως προς τον αριθμό των πιστοποιουμένων γλωσσών, ούτε ως προς τις ελεγχόμενες δεξιότητες, ούτε ως προς την οργάνωσή τους, ούτε ως προς τα κριτήρια πιστοποίησης, ούτε ως προς τη μορφή και την τυπολογία των δοκιμασιών τους. Ωστόσο, η αντιμετώπισή τους από τα αρμόδια για την αναγνώρισή τους όργανα δεν ποικίλει, με αποτέλεσμα να μην πληρούνται οι όροι της διαφάνειας, πολύ λιγότερο της διασφάλισης ποιότητας. Στην εργασία του, ο διδάκτωρ, αφού κατ\' αρχήν εκθέτει γενικά θεωρητικά κριτήρια για την αξιολόγηση, εξετάζει κριτικά τα χαρακτηριστικά συστημάτων πιστοποίησης. Επιχειρεί με διαγράμματα να τυποποιήσει τη διαδικασία της πιστοποίησης και προτείνει σειρά ταξινομικών πινάκων προκειμένου να συστηματοποιήσει τα κριτήρια των επι μέρους συνιστωσών της διαδικασίας πιστοποίησης της γλωσσομάθειας. Τελικά προτείνει ένα ταξινομικό μοντέλο χαρακτηριστικών που προϋποτίθενται και που αποτελούν όρους τους οποίους αναμένεται να πληροί ένα σύστημα πιστοποίησης γλωσσομάθειας
description: Le but de cette recherche est la sélection et l'organisation de critères permettant l'évaluation de dispositifs de certification en langues étrangères. Ces dispositifs n'obéissent souvent à aucune norme tant au plan du nombre des langues dont la connaissance est certifiée qu'à ceux des compétences mesurées, de leur organisation, des critères de certification, ainsi que de la forme et de la typologie des épreuves. Par ailleurs, l'appréhension des dispositifs, par les autorités responsables de leur reconnaissance, ne varie pas, ce qui fait que les normes de transparences ne sont pas respectées, et encore moins la garantie de la qualité. Après avoir exposé des critères généraux d'évaluation, l'auteur opère l'examen critique des caractéristiques des systèmes d'évaluation. Il tente de représenter la complexité du processus de certification par des diagrammes et il propose une collection de tableaux permettant d'ordonner les critères correspondant aux composantes du processus de certification en langues. Enfin, il propose un modèle taxonomique des caractéristiques qui devraient constituer les conditions minimales attendues d'un système de certification en langues.
Brief an Bonifacius Amerbach
Creators: name: Amerbach, Basilius
Publisher: name: [s.n.]
Year: 1535

description: von [Basilius I Amerbach]
description: Lateinisch
description: Verzeichnung=Description=Inventaire September 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Μελέτη των χαρακτηριστικών της δέσμης νετρονίων και προσδιορισμός παραμέτρων συντονισμού τηςσύλληψης νετρονίων στο 234U με την μέθοδο της ολικής απορρόφησης, στην περαματική διάταξη n_TOF του CERN
Creators: name: Λαμπούδης, Χρίστος Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Χρόνος πτήσης
Παράμετροι συντονισμού
Σύλληψη νετρονίου
Time of flight
Resonance parameters
Neutron capture

description: Ο κλάδος της πυρηνικής φυσικής και πιο συγκεκριμένα οι εφαρμογές της, συνοδεύονται σε διεθνές επίπεδο από διάφορα ζητήματα, όπως: η διαχείριση των πυρηνικών αποβλήτων, ο σχεδιασμός νέων πυρηνικών αντιδραστήρων, η θέσπιση νέων κανόνων ασφαλείας κλπ. Τα παραπάνω δημιούργησαν την ανάγκη κατασκευής εξελιγμένων συστημάτων και ενίσχυσαν την προσπάθεια επέκτασης και βελτίωσης των βιβλιοθηκών δεδομένων πυρηνικής φυσικής, όπως για παράδειγμα αυτά που σχετίζονται με τις αντιδράσεις σύλληψης νετρονίων σε διάφορα ισότοπα που συμμετέχουν στον κύκλο του Θορίου. Το παρόν περιλαμβάνει και παρουσιάζει τα αποτελέσματα των μετρήσεων της αντίδρασης (n,γ) στο 234U, που πραγματοποιήθηκαν στην πειραματική διάταξη n_TOF του CERN. Περιγράφεται με λεπτομέρεια η διάταξη και το βασικό σύστημα ανίχνευσης, ενώ τα αποτελέσματα δίνονται στη μορφή παραμέτρων συντονισμού της θεωρίας R - matrix και συγκρίνονται με τις υπάρχουσες βιβλιοθήκες δεδομένων
description: At an international level several issues accompany the long-term development of nuclear science and its applications: nuclear waste management, new reactor design, increasingly safety requirements, public acceptance etc. This has triggered many sophisticated R&D activities, such as Accelerator Driven Systems or next generation reactor concepts and enhanced the ongoing effort to expand and improve the existing nuclear data. Among other measurements of special interest, is the neutron capture cross section determination for several isotopes related to the nuclear fuel cycle. This text mainly presents the obtained results from the (n,γ) cross section measurement of 234U that was performed at n_TOF facility (CERN). In detail we describe the main features of the facility, the TAC (Total Absorption Calorimeter) detection arrangement and its performance under specific experimental conditions. Results in the form of R-matrix resonance parameters and cross sections are discussed in parallel with the existing ENDF data
Brief an Bruno und Basilius [I] Amerbach
Creators: name: Rechberger-Amerbach, Margaretha
Publisher: name: [s.n.]
Year: 1504

description: von Margaretha Amerbach
description: Deutsch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. I. Band. - Basel : Verl. der Universitätsbibliothek, 1942, Nr. 228
description: Verzeichnung=Description=Inventaire September 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Sensitive polarimetric search for relativity violations in gamma-ray bursts
Creators: name: Kostelecky, Alan
name: Mewes, Matthew
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that the recent measurements of linear polarization in gamma rays from GRB 930131 and GRB 960924 constrain certain types of relativity violations in photons to less than parts in 10^{37}, representing an improvement in sensitivity by a factor of 100,000.
description: 10 pages
Brief an Bonifacius Amerbach
Creators: name: Rechberger-Amerbach, Margaretha
Publisher: name: [s.n.]
Year: 1521

description: von Margaretha Rechberger
description: Deutsch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. II. Band. - Basel : Verl. der Universitätsbibliothek, 1943, Nr. 762
description: Verzeichnung=Description=Inventaire September 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog
Brief an Bonifacius Amerbach
Creators: name: Rechberger-Amerbach, Margaretha
Publisher: name: [s.n.]
Year: 1514

description: von Margaretha Rechberger
description: Deutsch
description: Druck: Die Amerbachkorrespondenz / bearb. und hrsg. von Alfred Hartmann. II. Band. - Basel : Verl. der Universitätsbibliothek, 1943, Nr. 502
description: Verzeichnung=Description=Inventaire September 2012 Vollständige Rekatalogisierung nach Standortverzeichnis G II 1 - G II 33 und Briefkatalog