cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multivariate Analysis of Globular Cluster's Horizontal Branch Morphology: searching for the second parameter
Creators: name: Recio-Blanco, A.
name: Aparicio, A.
name: Piotto, G.
name: De Angeli, F.
name: Djorgovski, S. G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The interpretation of globular cluster horizontal branch (HB) morphology is a classical problem that can significantly blur our understanding of stellar populations. In this paper, we present a new multivariate analysis connecting the effective temperature extent of the HB with other cluster parameters. The work is based on Hubble Space Telescope photometry of 54 Galactic globular clusters. The present study reveals an important role of the total mass of the globular cluster on its HB morphology. More massive clusters tend to have HBs more extended to higher temperatures. For a set of three input variables including the temperature extension of the HB, [Fe/H] and M_V, the first two eigenvectors account for the 90% of the total sample variance. Possible effects of cluster self-pollution on HB morphology, eventually stronger in more massive clusters, could explain the results here derived.
description: Accepted for publication in Astronomy & Astrophysics
Long-term monitoring of bright blazars in the multi-GeV to TeV range with FACT
Creators: name: Temme, Fabian
name: Adam, Jan
name: Ahnen, Max L.
name: Baack, Dominik
name: Balbo, Matteo
name: Bergmann, Matthias
name: Biland, Adrian
name: Blank, Michael
name: Bretz, Thomas
name: Brügge, Kai A.
name: Buss, Jens
name: Dmytriiev, Anton
name: Dorner, Daniela
name: Einecke, Sabrina
name: Hempfling, Christina
name: Hildebrand, Dorothee
name: Hughes, Gareth
name: Linhoff, Lena
name: Mannheim, Karl
name: Müller, Sebastian
name: Neise, Dominik
name: Neronov, Andrii
name: Nöthe, Max
name: Paravac, Aleksander
name: Pauss, Felicitas
name: Rhode, Wolfgang
name: Shukla, Amit
name: Thaele, Julia
name: Walter, Roland
Publisher: name: Technische Universität Dortmund
Year: 2017
Subjects: subject: Imaging Air Cherenkov Telescope
subject: First G-APD Cherenkov Telescope
subject: Very high energy gamma rays
subject: Long-term monitoring
subject: Silicon photo multiplier
subject: 530

description: Blazars like Markarian 421 or Markarian 501 are active galactic nuclei (AGN), with their jets orientated towards the observer. They are among the brightest objects in the very high energy (VHE) gamma ray regime (>100 GeV). Their emitted gamma-ray fluxes are extremely variable, with changing activity levels on timescales between minutes, months, and even years. Several questions are part of the current research, such as the question of the emission regions or the engine of the AGN and the particle acceleration. A dedicated longterm monitoring program is necessary to investigate the properties of blazars in detail. A densely sampled and unbiased light curve allows for observation of both high and low states of the sources, and the combination with multi-wavelength observation could contribute to the answer of several questions mentioned above. FACT (First G-APD Cherenkov Telescope) is the first operational telescope using silicon photomultiplier (SiPM, also known as Geigermode—Avalanche Photo Diode, G-APD) as photon detectors. SiPM have a very homogenous and stable longterm performance, and allow operation even during full moon without any filter, leading to a maximal duty cycle for an Imaging Air Cherenkov Telescope (IACT). Hence, FACT is an ideal device for such a longterm monitoring of bright blazars. A small set of sources (e.g., Markarian 421, Markarian 501, 1ES 1959+650, and 1ES 2344+51.4) is currently being monitored. In this contribution, the FACT telescope and the concept of longterm monitoring of bright blazars will be introduced. The results of the monitoring program will be shown, and the advantages of densely sampled and unbiased light curves will be discussed.
description: Galaxies;5(1)
DIE BEWERTUNG DES INTERNATIONAL FOOD STANDARD DURCH UNTERNEHMEN DER ERNAHRUNGSINDUSTRIE: ERGEBNISSE EINER EMPIRISCHEN UNTERSUCHUNG
Creators: name: Gawron, Jana-Christina
name: Theuvsen, Ludwig
name: Gawron, Jana-Christina
name: Theuvsen, Ludwig
Publisher: name: Unknown
Year: 2006
Subjects: Agribusiness

description: In der Agrar- und Ernährungswirtschaft haben sich Zertifizierungsstandards sehr weitgehend durchgesetzt. Zu den bedeutsamsten Systemen zählt der International Food Standard (IFS). Ge-stützt auf eine telefonische Befragung von 65 IFS-zertifizierten Unternehmen werden die Vor- und Nachteile des IFS aus Sicht der Ernährungsindustrie dargestellt. In einer Clusteranalyse werden drei Gruppen von Unternehmen mit jeweils sehr unterschiedlichen Auffassungen zum IFS erkennbar. Einige Überlegungen zur Nutzung und Weiterentwicklung des Standards be-schließen den Beitrag.
Virtual Braids and the L--Move
Creators: name: Kauffman, Louis H.
name: Lambropoulou, Sofia
Publisher: name: arXiv
Year: 2005
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25

description: In this paper we prove a Markov Theorem for virtual braids and for some analogs of this structure. The virtual braid group is the natural companion in the category of virtual knots, just as the Artin braid group is the natural companion to classical knots and links. In this paper we follow the L--move methods to prove the Virtual Markov Theorem. One benefit of this approach is a fully local algebraic formulation of the Theorem.
description: 42 pages, 42 figures, LaTeX document
KONSEQUENZEN DER WELTWEIT ZUNEHMENDEN VERBREITUNG GENTECHNISCH VERÄNDERTER PFLANZEN IN DER LEBENS- UND FUTTERMITTELPRODUKTION IN DEUTSCHLAND
Creators: name: Hirzinger, Tobias
name: Menrad, Klaus
name: Hirzinger, Tobias
name: Menrad, Klaus
Publisher: name: Unknown
Year: 2006
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: Genetic Modification
subject: Law
subject: FOS: Law
subject: Food
subject: Feed
subject: GMO
subject: Coexistence
subject: Labelling
subject: Traceability

description: Seit der ersten Aussaat 1996 in den USA nimmt die Anbaufläche transgener Pflanzen jährlich stetig zu und 2005 wurden weltweit auf 90 Mio. ha transgene Pflanzen angebaut. In der EU wurden in den letzten Jahren umfangreiche gesetzliche Regelungen erlassen, welche die Zulassung, die Kennzeichnung und das Monitoring gentechnisch veränderter Organismen (GVO) regeln. In der vorliegenden Studie wurde untersucht, welche Konsequenzen der weltweite Anbau gentechnisch veränderter Pflanzen, unter Beachtung der europäischen Gentechnikgesetzgebung, für die Lebens- und Futtermittelindustrie in Deutschland hat. Empirische Grundlage ist eine umfassende schriftliche Befragung, die 2005 durchgeführt wurde. Das Ergebnis dieser Studie zeigt, dass vor allem Rohstoffimporte aus Nord- und Südamerika das Risiko einer ungewollten GVO-Beimischung bergen, da in diesen Ländern transgene Sorten, insbesondere bei Sojabohnen, schon weit verbreitet sind. In der Umfrage gaben 64% der Futtermittelhersteller an, GVO zu verwenden, wobei dies überwiegend Importe transgener Sojabohnen sind. Im Gegensatz dazu vermeiden die Lebensmittelhersteller zu 100% kennzeichnungspflichtige GVO. Nicht kennzeichnungspflichtige "GVO-freie" Produkte herzustellen (dabei muss der GVO-Anteil unter dem Schwellenwert von 0,9% liegen) ist mit zusätzlichem Aufwand verbunden, der sich überwiegend in höherem Personalaufwand, höheren Rohstoffkosten und zusätzlichen GVO-Analytikkosten äußert, die zusammen bis zu 2,3 % vom Umsatz betragen können. Bisher scheinen die Maßnahmen der Lebens- und Futtermittelhersteller erfolgreich zu sein, da laut der amtlichen Lebensmittelüberwachung in Deutschland die GVO-Kennzeichnungsvorgaben für Lebens- und Futtermittel fast durchgängig eingehalten werden.
Magnon and Hole Excitations in the Two-Dimensional Half-filled Hubbard Model
Creators: name: Zheng, Weihong
name: Singh, Rajiv R. P.
name: Oitmaa, J.
name: Sushkov, O. P.
name: Hamer, C. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Spin and hole excitation spectra and spectral weights are calculated for the half-filled Hubbard model, as a function of $t/U$. We find that the high energy spin spectra are sensitive to charge fluctuations. The energy difference $Δ(π,0)- Δ(π/2,π/2)$, which is negative for the Heisenberg model, changes sign at a fairly small $t/U\approx 0.053(5)$. The hole bandwidth is proportional to $J$, and considerably larger than in the t-J models. It has a minimum at ($π/2,π/2$) and a very weak dispersion along the antiferromagnetic zone boundary. A good fit to the measured spin spectra in La$_2$CuO$_4$ at $T=10K$ is obtained with the parameter values $U=3.1{\rm eV}$, $t=0.35{\rm eV}$.
description: 4 pages, 5 figures
Κρίνοντας την αξιοπιστία των stress tests των ευρωπαϊκών τραπεζών. Διερεύνηση με χρήση των αποδόσεων των δανείων μειωμένης εξασφαλίσεως
Creators: name: Τσέκου, Ελένη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Stress-testing
subject: Ευρωπαϊκή Ένωση
subject: Απόδοση των δανείων μειωμένης εξασφάλισης
subject: Τραπεζική λογιστική

description: Η έρευνα αυτή έχει στόχο να αναδείξει την επίδραση που είχε η ανακοίνωση των αποτελεσμάτων των stress tests του 2016 στην ευρωπαϊκή ένωση, στην απόδοση των δανείων μειωμένης εξασφάλισης. Εξετάστηκαν οι τράπεζες που συμμετείχαν στα stress tests αυτά και επιλέχθηκε ως χρονικός ορίζοντα της έρευνας οι επόμενοι μήνες από την ανακοίνωση των αποτελεσμάτων έως το τέλος του 2016, μέσω της μεθόδου της διαστρωματικής παλινδρόμησης. Η έρευνα καταλήγει στο συμπέρασμα ότι η απόδοση των δανείων μειωμένης εξασφάλισης δεν επηρεάστηκε από την ανακοίνωση των αποτελεσμάτων.
Do Platform Migrations Compromise Content Moderation? Evidence from r/The_Donald and r/Incels
Creators: name: Ribeiro, Manoel Horta
name: Jhaver, Shagun
name: Zannettou, Savvas
name: Blackburn, Jeremy
name: De Cristofaro, Emiliano
name: Stringhini, Gianluca
name: West, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: When toxic online communities on mainstream platforms face moderation measures, such as bans, they may migrate to other platforms with laxer policies or set up their own dedicated websites. Previous work suggests that within mainstream platforms, community-level moderation is effective in mitigating the harm caused by the moderated communities. It is, however, unclear whether these results also hold when considering the broader Web ecosystem. Do toxic communities continue to grow in terms of their user base and activity on the new platforms? Do their members become more toxic and ideologically radicalized? In this paper, we report the results of a large-scale observational study of how problematic online communities progress following community-level moderation measures. We analyze data from r/The_Donald and r/Incels, two communities that were banned from Reddit and subsequently migrated to their own standalone websites. Our results suggest that, in both cases, moderation measures significantly decreased posting activity on the new platform, reducing the number of posts, active users, and newcomers. In spite of that, users in one of the studied communities (r/The_Donald) showed increases in signals associated with toxicity and radicalization, which justifies concerns that the reduction in activity may come at the expense of a more toxic and radical community. Overall, our results paint a nuanced portrait of the consequences of community-level moderation and can inform their design and deployment.
description: This paper has been accepted at CSCW 2021, please cite accordingly
Chandra Observation of the Interaction between the Hot Plasma Nebula RCW89 and the Pulsar Jet of PSR B1509-58
Creators: name: Yatsu, Y.
name: Kataoka, J.
name: Kawai, N.
name: Kotani, T.
name: Tamura, K.
name: Brinkmann, W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a Chandra observation of the H II region RCW89. The nebula lies on 10' north from the central pulsar PSR B1509-58, and it has been suggested that the nebula is irradiated by the pulsar jet. We performed a spectral analysis of the seven brightest emitting regions aligned in a ``horse-shoe'' shape, and found that the temperature of the knots increases along the ``horse-shoe'' in the clockwise direction, while, in contrast, the ionization parameter decreases. This strongly supports a picture of energy transfer via the precessing pulsar jet. We examined the energy budget assuming that RCW89 is powered by the pulsar jet, and confirmed that the pulsar rotational energy loss is sufficient to drive the nebula. The rate of energy injection into RCW89 by the jet was estimated from the synchrotron radiation flux. We obtained a heating time-scale of 1400 yr, which is consistent with the pulsar characteristic age of 1700 yr. To explain the temperature gradient, we discuss the cooling process for plasma clouds in RCW89. We argue that the plasma clouds can be cooled down by the adiabatic expansion within 70 yr, and form the temperature gradient reflecting the sequential heating by the precessing pulsar jet. We also determined the velocities of the individual plasma clouds by spectral fitting. The plasma clouds in RCW89 are moving away at 240 ~ 860 km/s, which constrains the inclination angle of the pulsar spin axis i > 50 degree and the expanding velocity of the shell as v > 1100 km/s.
description: 15 pages, 8 figures, accepted in ApJ
How is a data-driven approach better than random choice in label space division for multi-label classification?
Creators: name: Szymanski, Piotr
name: Kajdanowicz, Tomasz
name: Kersting, Kristian
Publisher: name: Technische Universität Dortmund
Year: 2016
Subjects: subject: Label space clustering
subject: Label co-occurence
subject: Label grouping
subject: Multi-label classification
subject: Clustering
subject: Machine learning
subject: Random k-label sets
subject: Ensemble classification
subject: 004

description: We propose using five data-driven community detection approaches from social networks to partition the label space in the task of multi-label classification as an alternative to random partitioning into equal subsets as performed by RAkELd. We evaluate modularity-maximizing using fast greedy and leading eigenvector approximations, infomap, walktrap and label propagation algorithms. For this purpose, we propose to construct a label co-occurrence graph (both weighted and unweighted versions) based on training data and perform community detection to partition the label set. Then, each partition constitutes a label space for separate multi-label classification sub-problems. As a result, we obtain an ensemble of multi-label classifiers that jointly covers the whole label space. Based on the binary relevance and label powerset classification methods, we compare community detection methods to label space divisions against random baselines on 12 benchmark datasets over five evaluation measures. We discover that data-driven approaches are more efficient and more likely to outperform RAkELd than binary relevance or label powerset is, in every evaluated measure. For all measures, apart from Hamming loss, data-driven approaches are significantly better than RAkELd ( α=0.05 ), and at least one data-driven approach is more likely to outperform RAkELd than a priori methods in the case of RAkELd’s best performance. This is the largest RAkELd evaluation published to date with 250 samplings per value for 10 values of RAkELd parameter k on 12 datasets published to date.
description: Entropy;18(8)
Principal Component Analysis of Weak Lensing Surveys
Creators: name: Munshi, Dipak
name: Kilbinger, Martin
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study degeneracies between cosmological parameters and measurement errors from cosmic shear surveys using a principal component analysis of the Fisher matrix. We simulate realistic survey topologies with non-uniform sky coverage, and quantify the effect of survey geometry, depth and noise from intrinsic galaxy ellipticities on the parameter errors. This analysis allows us to optimise the survey geometry. Using the shear two-point correlation functions and the aperture mass dispersion, we study various degeneracy directions in a multi-dimensional parameter space spanned by Omega_m, Omega_Lambda, sigma_8, the shape parameter Gamma, the spectral index n_s, along with parameters that specify the distribution of source galaxies. If only three parameters are to be obtained from weak lensing data, a single principal component is dominant and contains all information about the main parameter degeneracies and their errors. The variance of the dominant principal component of the Fisher matrix shows a minimum for survey strategies which have small cosmic variance and measure the shear correlation up to several degrees [abridged].
description: 13 pages, 17 figures. A&A in press, matches the version to be published
DER EUROPAISCHE MILCHMARKT ZWISCHEN REFORM UND LIBERALISIERUNG
Creators: name: Salamon, Petra
name: Ledebur, Oliver Von
name: Salamon, Petra
name: Ledebur, Oliver Von
Publisher: name: Unknown
Year: 2006

description: Im Beitrag werden die Auswirkungen der Implementierung des MTR und der Abschaffung aller Exportsubventionen im Rahmen der Doha-Runde der WTO mit einem besonderen Augenmerk auf die Effekte im Milchsektor untersucht. Dazu werden Simulationen mit einem partiellen Marktmodell durchgeführt. Alle Milchprodukte einschließlich Rohmilch erfahren Preissenkungen, teilweise deutlich. Erwartungsgemäß sind die Auswirkungen der kombinierten Simulation von MTR und partieller Liberalisierung ausgeprägter als eine reine MTR Simulation. Variationsrechnungen bei dem besonders betroffenen Marktprodukt Butter verdeutlichen, dass bei zusätzlichen hohen Zollkürzungen der Nettoimport steigt.
Analysis of the influence of fibers on the formability of metal blanks in manufacturing processes for fiber metal laminates
Creators: name: Mennecart, Thomas
name: Gies, Soeren
name: Ben Khalifa, Nooman
name: Tekkaya, A. Erman
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Fiber metal laminates
subject: Deep drawing
subject: Formability
subject: 620
subject: 670

description: In the one-step manufacturing process for fiber metal laminate parts, the so-called in situ hybridization process, the fabrics are interacting with metal blanks. During deep drawing, the liquid matrix is injected between the metal sheets through the woven fiber layers. The metal blanks can be in contact with dry or with infiltrated fibers. The formability of the blanks is influenced by the variation of the starting time of injection. The reason for that is that, due to high contact forces, the fibers are able to deform the metal surface locally, so that movement and the strain of the blanks is inhibited. To investigate the influence of different fibers on the formability of metals, Nakazima tests are performed. In these tests, two metal blanks are formed with an interlayer of fibers. The results are compared with the formability of two blanks without any interlayer. It is shown that in with fibers between sheets, the formability decreases compared to the formability of two metal blanks without interlayers. Based on a simplified numerical model for different types of fibers, the interactions of the fibers with the metal blank are analyzed. It could be shown that the friction due to contact has more influence than the friction due to the form fit caused by the imprints.
description: Journal of manufacturing and materials processing;Jg. 3, Heft 1. S. 2-1-2-15
Η διαχείριση κρίσεων σε μικρές επιχειρήσεις, μια εμπειρική μελέτη
Creators: name: Παπακυριάκου, Ευθυμία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Κρίση
subject: Διαχείριση κρίσεων
subject: Επιχειρησιακές κρίσεις
subject: Στάδια κρίσεων

description: Η κρίση είναι μια απρόβλεπτη κατάσταση που εμφανίζεται, ως επί το πλείστον, ξαφνικά και ενδέχεται να προκαλέσει αστάθεια και αλλαγές σε ποικίλους τομείς της επιχείρησης ή του οργανισμού. Στη συγκεκριμένη μελέτη έγινε μια προσπάθεια να διερευνηθεί βιβλιογραφικά, σε πρώτη η φάση, η φύση της κρίσης και τα στάδια από τα οποία διέπεται. Εν συνεχεία αναλύεται η διαχείριση κρίσεων η οποία είναι μια προσπάθεια αντιμετώπισης των κρίσεων που ανακύπτουν. Ως διαδικασία συμπεριλαμβάνει, πέρα από το βασικό στάδιο της αντιμετώπισης, την πρόληψη και προετοιμασία της κρίσης η οποία στοχεύει στην αποδυνάμωση των ήδη γνωστών κινδύνων που ενδέχεται να απειλήσουν την επιχείρηση. Επιπρόσθετα, εμπεριέχει το στάδιο της μάθησης που είναι μια διαδικασία αξιολόγησης του συνολικού τρόπου αντιμετώπισης και προκύπτει με το πέρας της κρίσης. Στην έρευνα που πραγματοποιήθηκε ερευνήθηκαν οι τρόποι με τους οποίους οι επιχειρήσεις επέλεξαν να διαχειριστούν την εκάστοτε κρίση και οι απόψεις των επιχειρηματιών και οι επιπτώσεις που επέφερε ο COVID-19 σε επιχειρήσεις. Στην έρευνα συμμετείχαν 10 επιχειρηματίες οι οποίοι δραστηριοποιούνται σε διαφορετικούς τομείς μεταξύ τους. Το εργαλείο έρευνας που χρησιμοποιήθηκε είναι οι ημιδομημένες συνεντεύξεις και η ανάλυση των δεδομένων έγινε με τη μέθοδο της θεματικής ανάλυσης και τη χρήση γραφημάτων. Τα συμπεράσματα της έρευνας δείχνουν ότι οι επιχειρήσεις διαχειρίστηκαν τις κρίσεις υιοθετώντας διαφορετικούς τρόπους. Το στάδιο της πρόληψης δεν αξιοποιήθηκε από κάποια επιχείρηση ωστόσο η αντιμετώπιση και η μάθηση πράγματι ήταν μέρος της διαχείρισης των κρίσεων.
Measurement invariance of a direct behavior rating multi item scale across occasions
Creators: name: Gebhardt, Markus
name: DeVries, Jeffrey M.
name: Jungjohann, Jana
name: Casale, Gino
name: Gegenfurtner, Andreas
name: Kuhn, Jörg-Tobias
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Direct behavior rating
subject: Test
subject: Sensitivity over time
subject: Rating
subject: School
subject: Classroom
subject: Behavior
subject: Progress monitoring
subject: 370

description: Direct Behavior Rating (DBR) as a behavioral progress monitoring tool can be designed as longitudinal assessment with only short intervals between measurement points. The reliability of these instruments has been mostly evaluated in observational studies with small samples based on generalizability theory. However, for a standardized use in the pedagogical field, a larger and broader sample is required in order to assess measurement invariance between different participant groups and over time. Therefore, we constructed a DBR, the Questionnaire for Monitoring Behavior in Schools (QMBS) with multiple items to measure the occurrence of specific externalizing and internalizing student classroom behaviors on a Likert scale (1 = never to 7 = always). In a pilot study, two trained raters observed 16 primary education students and rated the student behavior over all items with a satisfactory reliability. In the main study, 108 regular primary school students, 97 regular secondary students, and 14 students in a clinical setting were rated daily over one week (five measurement points). Item response theory (IRT) analyses confirmed the technical adequacy of the instrument and latent growth models demonstrated the instrument’s stability over time. Further development of the instrument and study designs to implement DBRs is discussed.
description: Social Sciences;Jg. 8, Heft 2. S. 46-1-46-14
Evidence for Correlated Titanium and Deuterium Depletion in the Galactic ISM
Creators: name: Prochaska, Jason X.
name: Tripp, Todd M.
name: Howk, J. Christopher
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Current measurements indicate that the deuterium abundance in diffuse interstellar gas varies spatially by a factor of ~4 among sightlines extending beyond the Local Bubble. One plausible explanation for the scatter is the variable depletion of D onto dust grains. To test this scenario, we have obtained high signal-to-noise, high resolution profiles of the refractory ion TiII along seven Galactic sightlines with D/H ranging from 0.65 to 2.1x10^-5. These measurements, acquired with the recently upgraded Keck/HIRES spectrometer, indicate a correlation between Ti/H and D/H at the >95% c.l. Therefore, our observations support the interpretation that D/H scatter is associated with differential depletion. We note, however, that Ti/H values taken from the literature do not uniformly show the correlation. Finally, we identify significant component-to-component variations in the depletion levels among individual sightlines and discuss complications arising from this behavior.
description: 4 pages; Accepted to Astrophysical Journal Letters
Resolved Multi-element Stellar Chemical Abundances in the Brightest Quiescent Galaxy at z $\sim$ 2
Creators: name: Jafariyazani, Marziye
name: Newman, Andrew B.
name: Mobasher, Bahram
name: Belli, Sirio
name: Ellis, Richard S.
name: Patel, Shannon G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Measuring the chemical composition of galaxies is crucial to our understanding of galaxy formation and evolution models. However, such measurements are extremely challenging for quiescent galaxies at high redshifts, which have faint stellar continua and compact sizes, making it difficult to detect absorption lines and nearly impossible to spatially resolve them. Gravitational lensing offers the opportunity to study these galaxies with detailed spectroscopy that can be spatially resolved. In this work, we analyze deep spectra of MRG-M0138, a lensed quiescent galaxy at z = 1.98 which is the brightest of its kind, with an H-band magnitude of 17.1. Taking advantage of full spectral fitting, we measure $[{\rm Mg/Fe}]=0.51\pm0.05$, $[\rm{Fe/H}]=0.26\pm0.04$, and, for the first time, the stellar abundances of 6 other elements in this galaxy. We further constrained, also for the first time in a $z\sim2$ galaxy, radial gradients in stellar age, [Fe/H], and [Mg/Fe]. We detect no gradient in age or [Mg/Fe] and a slightly negative gradient in [Fe/H], which has a slope comparable to that seen in local early-type galaxies. Our measurements show that not only is MRG-M0138 very Mg-enhanced compared to the centers of local massive early-type galaxies, it is also very iron rich. These dissimilar abundances suggest that even the inner regions of massive galaxies have experienced significant mixing of stars in mergers, in contrast to a purely inside-out growth model. The abundance pattern observed in MRG-M0138 challenges simple galactic chemical evolution models that vary only the star formation timescale and shows the need for more elaborate models.
description: Accepted for publication in ApJ Letters
Κουλτούρα και χρηματοπιστωτικό σύστημα
Creators: name: Τσατάλμπαση, Μαρία-Άννα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Κουλτούρα
subject: Χρηματοπιστωτικό σύστημα
subject: Θρησκεία
subject: Χρηματοπιστωτικά ιδρύματα

description: Σκοπός της παρούσας έρευνας είναι να εξετάσουμε τον τρόπο με τον οποίο η κουλτούρα μπήκε στον οικονομικό λόγο. Θα δούμε την άποψη οικονομολόγων αλλά και πολιτικών επιστημόνων, για το αν πρέπει ή όχι να περιλαμβάνεται η κουλτούρα μέσα σε μια οικονομική ανάλυση. Αν και σε γενικές γραμμές η κουλτούρα είναι δύσκολο να οριστεί καθώς διαφέρει ανά την υφήλιο, στην οικονομία είναι αποδεκτό πως έχει την έννοια της εμπιστοσύνης. Η κουλτούρα επηρεάζει τα ατομικά χαρακτηριστικά συνεπώς έχει αντίκτυπο στη διαδικασία λήψης αποφάσεων. Έτσι, τα οικονομικά αποτελέσματα επηρεάζονται μέσω διάφορων μηχανισμών εμπιστοσύνης. Στη συνέχεια παρουσιάζονται μελέτες πάνω σε αυτή τη θεωρία αλλά και νέα στοιχεία τα οποία διακρίνουν σε δύο κατηγορίες τον τρόπο που επηρεάζονται τα οικονομικά αποτελέσματα: πεποιθήσεις και προτιμήσεις. Θα δούμε τη σύγχρονη, την παραδοσιακή και τη νομική θεωρία για τη χρηματοπιστωτική ανάπτυξη των χωρών αλλά και τον ρόλο που έχουν οι ενδιάμεσοι μέσα σε αυτή. Στη μελέτη θα εξεταστεί το πώς η κουλτούρα ενός λαού με βάση τα δεδομένα τα οποία την πλαισιώνουν όπως είναι η θρησκεία επηρεάζουν τις χρηματοπιστωτικές αποφάσεις και γενικά τη λειτουργία των σχετικών ιδρυμάτων τα οποία καλούνται να προσαρμοστούν στις ανάγκες των καταναλωτών ανάλογα με τη κουλτούρα τους. Όπως αναφέρθηκε ο βασικός παράγον ανάπτυξης σχέσεων εμπιστοσύνης μεταξύ καταναλωτών και χρηματοπιστωτικών ιδρυμάτων έχει να κάνει με τη κουλτούρα μιας χώρας η οποία καθορίζει την άνωθεν σχέση. Στα κεφάλαια που ακολουθούν θα γίνει η μελέτη των σχέσεων αυτών βάση της κουλτούρας μιας χώρας ώστε να γίνει κατανοητή η σχέση καταναλωτών και χρηματοπιστωτικών ιδρυμάτων.
Molecular polaritonics in dense mesoscopic disordered ensembles
Creators: name: Sommer, Christian
name: Reitz, Michael
name: Mineo, Francesca
name: Genes, Claudiu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the dependence of the vacuum Rabi splitting (VRS) on frequency disorder, vibrations, near-field effects and density in molecular polaritonics. In the mesoscopic limit, static frequency disorder alone can already introduce a loss mechanism from polaritonic states into a dark state reservoir, which we quantitatively describe, providing an analytical scaling of the VRS with the level of disorder. Disorder additionally can split a molecular ensemble into donor-type and acceptor-type molecules and the combination of vibronic coupling, dipole-dipole interactions and vibrational relaxation induces an incoherent FRET (Förster resonance energy transfer) migration of excitations within the collective molecular state. This is equivalent to a dissipative disorder and has the effect of saturating and even reducing the VRS in the mesoscopic, high-density limit. Overall, this analysis allows to quantify the crucial role played by dark states in cavity quantum electrodynamics with mesoscopic, disordered ensembles.
Prospects for Low-Energy Antiproton Physics at Fermilab
Creators: name: Kaplan, Daniel M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Fermilab has long had the world's most intense antiproton source. Despite this, opportunities for low-energy antiproton physics at Fermilab have in the past been limited and--with the antiproton source now exclusively dedicated to serving the needs of the Tevatron Collider--are currently nonexistent. While the future of antiproton physics at Fermilab is uncertain, the anticipated shutdown of the Tevatron in about 2009 presents the opportunity for a world-leading low-energy antiproton program. We summarize the current status of the Fermilab antiproton facility and review some current topics in hyperon physics as examples of what might be achievable.
description: 6 pages, 1 figure, submitted to proceedings of the International conference on Low Energy Antiproton Physics (LEAP '05)
Στρατηγικό μάνατζμεντ και διοίκηση ολικής ποιότητας - Ο κλάδος της παραγωγής ηλεκτρικής ενέργειας: μελέτη περίπτωσης
Creators: name: Κατσίκα, Ελένη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Στρατηγικό μάνατζμεντ
subject: Διοίκηση ολικής ποιότητας
subject: Παραγωγή ηλεκτρικής ενέργειας
subject: ΔΕΗ Α.Ε.

description: Η παρούσα διπλωματική εργασία εστιάζει στον κλάδο της παραγωγής ηλεκτρικής ενέργειας στην Ελλάδα. Σημειώνεται ότι, στον εν λόγω κλάδο στην Ελλάδα αναμένονται διαρθρωτικές αλλαγές λόγω της αλλαγής του νομοθετικού πλαισίου για την απελευθέρωση της αγοράς ηλεκτρικής ενέργειας, των αυστηρότερων ορίων στις εκπομπές ρύπων, λόγω της κλιματικής αλλαγής, με συνέπεια την επέκταση της χρήσης «καθαρών» πηγών Ενέργειας (ΑΠΕ) και των απαιτήσεων της αγοράς για «φθηνότερη» ενέργεια, σε συνδυασμό με μεγαλύτερες παροχές, συνεπώς περισσότερα οφέλη για τον καταναλωτή. Στα παραπάνω πρέπει να προστεθεί και η ασταθής χρηματοοικονομική κατάσταση της μεγαλύτερης εταιρείας παραγωγής, διανομής και εμπορίας ηλεκτρικής ενέργειας στη χώρα της ΔΕΗ Α.Ε. Στόχος της διπλωματικής εργασίας είναι η διερεύνηση του κλάδου της παραγωγής ηλεκτρικής ενέργειας στην παρούσα χρονική περίοδο, καθώς χρήζει αναδιαμόρφωση το Στρατηγικό Μάνατζμεντ των Επιχειρήσεων, που δραστηριοποιούνται στον κλάδο, λόγω των προαναφερόμενων αλλαγών του περιβάλλοντος. Σύμφωνα με τα αποτελέσματα της διπλωματικής οι συνθήκες της αγοράς ευνοούν για την είσοδο νέων επιχειρήσεων στον κλάδο, ο οποίος βρίσκεται σε θετικό ρυθμό ανάπτυξης. Επιπλέον, ευνοούνται οι νέες επενδύσεις σε ΑΠΕ και σταθμούς παραγωγής με φυσικό αέριο, με στόχο την απαγκίστρωση των επιχειρήσεων του κλάδου από την προμήθεια των ακριβών καυσίμων και τη μείωση του τελικού κόστους παραγωγής ενέργειας. Στην μελέτη περίπτωσης εξετάστηκε η ΔΕΗ Α.Ε., η οποία βρίσκεται σε νέα φάση ανάταξης και μετασχηματισμού, με στόχο τη δημιουργία ενός σύγχρονου παρόχου ηλεκτρικής ενέργειας, με σεβασμό στον πολίτη/πελάτη, στους εργαζομένους και στους μετόχους. Η εταιρεία στοχεύει στην επιχειρησιακή στρατηγική της ανάπτυξης και στην επιχειρηματική στρατηγική της ηγεσίας με βάση το κόστος. Εν κατακλείδι, και σύμφωνα με τα αποτελέσματα της παρούσας μεταπτυχιακής εργασίας το Στρατηγικό Μάνατζμεντ δύναται να συνδράμει στον μετασχηματιζόμενο κλάδο της παραγωγής ηλεκτρικής ενέργειας με τη χρήση των εργαλείων της Διοίκηση Ολικής Ποιότητας.
High-Throughput Screening for Band gap Engineering by Sublattice Mixing of Cs$_2$AgBiCl$_6$ from First-Principles
Creators: name: Gill, Deepika
name: Bhumla, Preeti
name: Kumar, Manish
name: Bhattacharya, Saswata
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The lead-free double perovskite material (viz. Cs$_2$AgBiCl$_6$) has emerged as an efficient and environmentally friendly alternative to lead halide perovskites. To make Cs$_2$AgBiCl$_6$ optically active in the visible region of solar spectrum, band gap engineering approach has been undertaken. Using Cs$_2$AgBiCl$_6$ as a host, band gap and optical properties of Cs$_2$AgBiCl$_6$ have been modulated by alloying with M(I), M(II), and M(III) cations at Ag-/Bi-sites. Here, we have employed density functional theory (DFT) with suitable exchange-correlation functionals in light of spin-orbit coupling (SOC) to determine the stability, band gap and optical properties of different compositions, that are obtained on Ag-Cl and Bi-Cl sublattices mixing. On analyzing the 64 combinations within Cs$_2$AgBiCl$_6$, we have identified 19 promising configurations having band gap sensitive to solar cell applications. The most suitable configurations with Ge(II) and Sn(II) substitutions have spectroscopic limited maximum efficiency (SLME) of 32.08% and 30.91%, respectively, which are apt for solar cell absorber.
Two-Dimensional Compact N=(2,2) Lattice Super Yang-Mills Theory with Exact Supersymmetry
Creators: name: Sugino, Fumihiko
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct two-dimensional N=(2,2) lattice super Yang-Mills theory, where the gauge and Higgs fields are all represented by U(N) compact variables, with keeping one exact supercharge along the line of the papers [1,2,3]. Interestingly, requirements of the exact supersymmetry as well as of the compact gauge and Higgs fields lead to the gauge group U(N) rather than SU(N). As a result of the perturbative renormalization argument, the model is shown to flow to the target continuum theory without any fine-tuning. Different from the case of noncompact Higgs fields, the path integral along the flat directions is well-defined in this model.
description: 17 pages, no figure, LaTeX; v2:reference added, v3:minor corrections, v4:version to be published to Physics Letters B
Multiwavelength picture of the blazar S5 0716+714 during its brightest outburst
Creators: name: Manganaro, Marina
name: Pedaletti, Giovanna
name: Doert, Marlene
name: Bastieri, Denis
name: Ramazani, Vandad Fallah
name: Gasparrini, Dario
name: Lindfors, Elina
name: Lott, Benoit
name: Nievas, Mireia
name: Rani, Bindu
name: Thompson, David J.
name: Angelakis, Emmanouil
name: Borman, George
name: Gurwell, Mark
name: Hovatta, Talvikki
name: Itoh, Ryosuke
name: Jorstad, Svetlana
name: Kraus, Alex
name: Krichbaum, Thomas P.
name: Kuin, Paul
name: Lähteenmäki, Anne
name: Larionov, Valeri
name: Lien, Amy Yarleen
name: Myserlis, Ioannis
name: Tornikoski, Merja
name: Troitsky, Ivan
name: Zensus, J. Anton
Publisher: name: Technische Universität Dortmund
Year: 2016
Subjects: subject: BL Lacertae objects: individual: S5 0716+714
subject: Galaxies: active
subject: Gamma-rays: galaxies
subject: 530

description: S5 0716+714 is a well known BL Lac object, and one of the brightest and most active blazars. The discovery in the Very High Energy band (VHE, E > 100 GeV) by MAGIC happened in 2008. In January 2015, the source went through the brightest optical state ever observed, triggering MAGIC follow-up and a VHE detection with ∼ 13σ significance (ATel ♯6999 ). Rich multiwavelength coverage of the flare allowed us to construct the broad-band spectral energy distribution of S5 0716+714 during its brightest outburst. In this work, we will present the preliminary analysis of MAGIC and Fermi-LAT data of the flaring activity in January and February 2015 for the HE (0.1 < HE < 300 GeV) and VHE band, together with radio (Metsähovi, OVRO, VLBA, Effelsberg), sub-millimeter (SMA), optical (Tuorla, Perkins, Steward, AZT-8+ST7, LX-200, Kanata), X-ray and UV (Swift-XRT and UVOT), in the same time-window and discuss the time variability of the multiwavelength light curves during this impressive outburst.
description: Galaxies;4(4)
Recognizing and acknowledging worldview diversity in the inclusive classroom
Creators: name: Bartz, Janieta
name: Bartz, Thomas
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: Inclusion
subject: Worldview education
subject: Universal design for learning
subject: Learning in the presence of the other
subject: Reflexive inclusion
subject: 360
subject: 370
subject: Inklusive Schule |
subject: Lernen |
subject: Weltbild |

description: In the context of the increasing migration into Germany that has taken place in recent years and German efforts to establish an inclusive school system, which enables learners from different religious, ethnic, language and social backgrounds with and without disabilities to participate, religious education has become a key topic for interdisciplinary discourse between theology, philosophy, and pedagogy in German schools. The following questions are of special interest: How can we manage diversity in inclusive classroom settings in general, and specifically: how can we do so with regard to worldview diversity? Does worldview diversity in schools exist, and if so, how can we recognize it in its plurality and complexity? How can we acknowledge different worldviews in the context of a changing inclusive school system? In this article, we would like to present the theoretical foundation, the research setting and the first findings of our ongoing pilot studies of worldview education at an inclusive German school. The experiments are part of a larger project context that is also described. The case study presented in this article, in which innovative language and machine learning technology was used for data analysis, illustrates the potential of inclusive methods and didactic concepts such as Universal Design for Learning, Learning in the Presence of the Other, and Reflexive Inclusion for inclusive worldview education in the context of a religiously pluralized and secularized society.
description: Education Sciences;Jg.: 8, Heft: 4 | S. 196-1-196-13
Degassing rhythms and fluctuations of geogenic gases in a red wood-ant nest and in soil in the Neuwied Basin (East Eifel Volcanic Field, Germany)
Creators: name: Berberich, Gabriele M.
name: Berberich, Martin B.
name: Ellison, Aaron M.
name: Wöhler, Christian
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: 620
subject: Erdbebenvorhersage
subject: Vulkaneifel
subject: Seismologie
subject: Gasanalyse
subject: Formica polyctena

description: Geochemical tracers of crustal fluids (CO2, He, Rn) provide a useful tool for the identification of buried fault structures. We acquired geochemical data during 7-months of continual sampling to identify causal processes underlying correlations between ambient air and degassing patterns of three gases (CO2, He, Rn) in a nest of red wood ants (Formica polyctena; “RWA”) and the soil at Goloring in the Neuwied Basin, a part of the East Eifel Volcanic Field (EEVF). We explored whether temporal relations and degassing rhythms in soil and nest gas concentrations could be indicators of hidden faults through which the gases migrate to the surface from depth. In nest gas, the coupled system of CO2-He and He concentrations exceeding atmospheric standards 2-3 fold suggested that RWA nests may be biological indicators of hidden degassing faults and fractures at small scales. Equivalently periodic degassing infradian rhythms in the RWA nest, soil, and three nearby minerals springs suggested NW-SE and NE-SW tectonic linkages. Because volcanic activity in the EEVF is dormant, more detailed information on the EEVF’s tectonic, magmatic, and degassing systems and its active tectonic fault zones are needed. Such data could provide additional insights into earthquake processes that are related to magmatic processes at the lower crust.
description: Insects;Jg.: 9, Heft: 4 | S. 135-1-135-25
Advanced Single Image Resolution Upsurging Using a Generative Adversarial Network
Creators: name: Rahman, Md. Moshiur
name: Dey, Samrat Kumar
name: Shibly, Kabid Hassan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The resolution of an image is a very important criterion for evaluating the quality of the image. A higher resolution of an image is always preferable as images of lower resolution are unsuitable due to fuzzy quality. A higher resolution of an image is important for various fields such as medical imaging; astronomy works and so on as images of lower resolution becomes unclear and indistinct when their sizes are enlarged. In recent times, various research works are performed to generate a higher resolution of an image from its lower resolution. In this paper, we have proposed a technique of generating higher resolution images form lower resolution using Residual in Residual Dense Block network architecture with a deep network. We have also compared our method with other methods to prove that our method provides better visual quality images.
description: 10 pages, 4 figures, 1 Table
Συμπεριφορά των τραπεζών έναντι του επιτοκιακού κινδύνου - Ανάλυση παραμέτρων και διαχείρισης
Creators: name: Μπαρζός, Νικόλαος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Καταθέσεις
subject: Κίνδυνος επιτοκίου
subject: Μετασχηματισμός ληκτότητας
subject: Ευαισθησία αξιογράφων
subject: Τραπεζικά ιδρύματα

description: Στο παρόν έγγραφο αναλύεται με σαφήνεια ο μετασχηματισμός ληκτότητας στον Τραπεζικό Κλάδο και ο δυνητικός κίνδυνος επιτοκίου που συνεπάγεται. Αναδεικνύουμε το ρόλο του Προνομιακού Μηχανισμού Κατάθεσης (Deposit Franchise) και πως αυτός ενεργά αντισταθμίζει πλήρως το Κίνδυνο. Ο Προνομιακός Μηχανισμός κατάθεσης επιτρέπει στις βραχυπρόθεσμες καταθέσεις να συμπεριφέρονται ως μακροχρόνιες υποχρεώσεις στον Ισολογισμό, διευκολύνοντας το μετασχηματισμό ληκτότητας. Αυτό συμβαίνει επειδή το κόστος εξυπηρέτησης των καταθετών (λειτουργικά κόστη τράπεζας) είναι μεν υψηλό αλλά δεν επηρεάζεται από το βραχυπρόθεσμο επιτόκιο δανεισμού της αγοράς ,κάτι που μοιάζει με μακροχρόνια σταθερού-επιτοκίου υποχρέωση. Η μακροχρόνια υποχρέωση χρίζει αντιστοίχισης με επένδυση μακροπρόθεσμης ληκτότητας ανατιμολόγησης. Επιπλέον ο Προνομιακός Μηχανισμός Κατάθεσης συμφέρει μια Τράπεζα καθώς λόγω της δύναμης στα επιτόκια καταθέσεων που αποκομίζει από την de facto ερμηνεία της ως καταθετικό Ίδρυμα (depository institution), της επιτρέπεται να πληρώνει χαμηλό επιτόκιο στους καταθέτες μη-ευαίσθητο στα αγοραία επιτόκια. Προσεγγίζοντας τις πέντε μεγαλύτερες τράπεζες των ΗΠΑ με βάση το εισόδημα, αποδεικνύουμε ότι τράπεζες με πολύ χαμηλή ευαισθησία των εξόδων στις μεταβολές του επιτοκίου βάσης (κάτι που συνεπάγεται ισχυρό Προνομιακό Μηχανισμό κατάθεσης) εμφανίζουν αυξημένη διαφορά μεταξύ της μέσης διάρκειας των (μακροπρόθεσμων) περιουσιακών στοιχείων και της μέσης διάρκειας των (βραχυπρόθεσμων) στοιχείων των υποχρεώσεων. Αποδεικνύοντας την πολύ χαμηλή έκθεση του καθαρού περιθωρίου κέρδους, ως δείκτη κερδοφορίας τους, στις μεταβολές του επιτοκίου βάσης καταλήγουμε ότι δεν φέρουν κίνδυνο επιτοκίου.
Search for high-confidence blazar candidates and their MWL counterparts in the Fermi-LAT catalog using machine learning
Creators: name: Einecke, Sabrina
Publisher: name: Technische Universität Dortmund
Year: 2016
Subjects: subject: Blazars
subject: Fermi-LAT
subject: 3FGL
subject: Swift-XRT
subject: 1SXPS
subject: WISE
subject: ALLWISE
subject: Machine learning
subject: 530

description: A large fraction of the gamma-ray sources presented in the Third Fermi-LAT source catalog (3FGL) is affiliated with counterparts and source types, but 1010 sources remain unassociated and 573 sources are associated with active galaxies of uncertain type. The purpose of this study is to assign blazar classes to these unassociated and uncertain sources, and to link counterparts to the unassociated. A machine learning algorithm is used for the classification, based on properties extracted from the 3FGL, an infrared and an X-ray catalog. To estimate the reliability of the classification, performance measures are considered through validation techniques. The classification yielded purity values around 90% with efficiency values of roughly 50%. The prediction of high-confidence blazar candidates has been conducted successfully, and the possibility to link counterparts in the same procedure has been proven. These findings confirm the relevance of this novel multiwavelength approach.
description: Galaxies;4(3)
Contractibility of deformation spaces of G-trees
Creators: name: Clay, Matt
Publisher: name: arXiv
Year: 2005
Subjects: subject: Group Theory (math.GR)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20E08, 20F65, 20F28

description: Forester has defined spaces of simplicial tree actions for a finitely generated group, called deformation spaces. Culler and Vogtmann's Outer space is an example of a deformation space. Using ideas from Skora's proof of the contractibility of Outer space, we show that under some mild hypotheses deformation spaces are contractible.
description: Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol5/agt-5-59.abs.html