cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Empirical Testing Of Solar Coronal And Solar Wind Models
Creators: name: Woolsey, Lauren
Publisher: name: Zenodo
Year: 2014
Subjects: Solar physics
Solar wind

description: Final presentations of the Center for Astrophysics HEA/SSP Solar Summer Intern Program.
description: {"references": ["Akinari, N. (2007). Broadening of resonantly scattered ultraviolet emission lines by coronal hole outflows. ApJ, 660: 1660-1673.", "Cranmer et al. (1999). An empirical model of a polar coronal hole at solar minimum. ApJ, 511: 481.", "Jacques, S.A. (1977). Momentum and energy transport by waves in the solar atmosphere and solar wind. ApJ, 215: 942-951.", "Kohl et al. (1995). The Ultraviolet Coronagraph Spectrometer for the Solar and Heliospheric Observatory. Solar Physics, 162(1-2): 313-356.", "Landi, E. and Cranmer, S.R. (2009). Ion temperatures in the low solar corona: Polar coronal holes at solar minimum. ApJ, 691: 794-805.", "Lionello, R., J.A. Linker, and Z. Miki\u0107 (2009). Multispectral emission of the Sun during the first whole Sun month: Magnetohydrodynamics simulations. ApJ, 690: 902-912.", "Ong et al. (1997). Self-consistent and time-dependent solar wind models. ApJ, 474: L143-L145.", "Withbroe, G.L., J.L. Kohl, and H. Weiser (1982). Probing the solar wind acceleration region using spectroscopic techniques. Space Science Reviews, 33: 17-52."]}
Optical Absorption Measurements on Crystalline Silicon at 1550nm
Creators: name: Steinlechner, Jessica
name: Krüger, Christoph
name: Lastzka, Nico
name: Steinlechner, Sebastian
name: Khalaidovski, Alexander
name: Schnabel, Roman
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Crystalline silicon is currently being discussed as test-mass material for future generations of gravitational wave detectors that will operate at cryogenic temperatures. We present optical absorption measurements on a large-dimension sample of crystalline silicon at a wavelength of 1550nm at room temperature. The absorption was measured in a monolithic cavity setup using the photo-thermal self-phase modulation technique. The result for the absorption coefficient of this float-zone sample with a specific resistivity of 11kOhm cm was measured to be α_A=(264 +/- 39)ppm/cm.
description: 11 pages, 6 figures, 1 table
Les banques centrales savent-elles gérer la crise ?
Creators: name: TIOUMAGNENG, André
name: TCHOMGOUO, Gédéon
name: FOTSING, Rocard
Publisher: name: Zenodo
Year: 2023
Subjects: Crise ; décision ; dividendes ; banques commerciales ; banques centrales.

description: Nombre de banques centrales dans le monde, à l'orée de l'internationalisation de la Covid-19, ont stratégiquement enjoints les banques commerciales (banques) à suspendre la distribution des dividendes. Cet article traite de cette décision de gestion de crise polémique, passée sous silence dans le débat académique, dans une perspective d'évaluation critique en se proposant de montrer son impertinence. L'approche est essentiellement conceptuelle et articule, entre autres grilles de lecture, les théories financières, de la décision organisationnelle, de la gouvernance d'entreprise et des choix publics. L'analyse est attentive au contexte particulier de l'Afrique. Elle met en lumière le caractère problématique de la décision étudiée, compte tenu des critères d'efficience et d'efficacité, en considération du déficit budgétaire qu'induit son exécution et de son caractère néocolonialiste. L'implication managériale de l'étude réside dans l'enjeu qu'a la banque centrale de veiller autant à la consensualité de ses décisions, dans son rapport aux banques, qu'à leur sensibilité contextuelle. Les auteurs appellent, en termes de perspective épistémologique, à une approche gestionnaire et l'exploration des décisions de la banque centrale suivant une perspective intra-organisationnelle pour en maîtriser les rationalités sous-jacentes.
On using Extreme Values to detect global stability thresholds in multi-stable systems: The case of transitional plane Couette flow
Creators: name: Faranda, Davide
name: Lucarini, Valerio
name: Manneville, Paul
name: Wouters, Jeroen
Publisher: name: arXiv
Year: 2012
Subjects: subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: Geophysics (physics.geo-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Extreme Value Theory (EVT) is exploited to determine the global stability threshold $R_g$ of plane Couette flow --the flow of a viscous fluid in the space between two parallel plates-- whose laminar or turbulent behavior depends on the Reynolds number R. Even if the existence of a global stability threshold has been detected in simulations and experiments, its numerical value has not been unequivocally defined. $R_g$ is the value such that for $R > R_g$ turbulence is sustained, whereas for $R < R_g$ it is transient and eventually decays. We address the problem of determining $R_g$ by using the extremes - maxima and minima - of the perturbation energy fluctuations. When $R_g$, both the positive and negative extremes are bounded. As the critical Reynolds number is approached from above, the probability of observing a very low minimum increases causing asymmetries in the distributions of maxima and minima. On the other hand, the maxima distribution is unaffected as the fluctuations towards higher values of the perturbation energy remain bounded. This tipping point can be detected by fitting the data to the Generalized Extreme Value (GEV) distribution and by identifying $R_g$ as the value of $R$ such that the shape parameter of the GEV for the minima changes sign from negative to positive. The results are supported by the analysis of theoretical models which feature a bistable behavior.
description: 20 pages, 4 figures. Chaos Solitons and Fractals 2014
Betti diagrams from graphs
Creators: name: Engström, Alexander
name: Stamps, Matthew T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: The emergence of Boij-Söderberg theory has given rise to new connections between combinatorics and commutative algebra. Herzog, Sharifan, and Varbaro recently showed that every Betti diagram of an ideal with a k-linear minimal resolution arises from that of the Stanley-Reisner ideal of a simplicial complex. In this paper, we extend their result for the special case of 2-linear resolutions using purely combinatorial methods. Specifically, we show bijective correspondences between Betti diagrams of ideals with 2-linear resolutions, threshold graphs, and anti-lecture hall compositions. Moreover, we prove that any Betti diagram of a module with a 2-linear resolution is realized by a direct sum of Stanley-Reisner rings associated to threshold graphs. Our key observation is that these objects are the lattice points in a normal reflexive lattice polytope.
description: To appear in Algebra and Number Theory, 15 pages, 7 figures
Tachyon Vacuum of Bosonic Open String Field Theory in Marginally Deformed Backgrounds
Creators: name: Inatomi, Shoko
name: Kishimoto, Isao
name: Takahashi, Tomohiko
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider bosonic open string field theory in marginally deformed backgrounds, which is obtained by expanding the string field around the identity-based solutions associated with marginal deformations. We find a new set of string fields which satisfies the KBc algebra, but the nilpotent kinetic operator is that of the theory expanded around the identity-based marginal solution. By use of these string fields, we construct the tachyon vaccum solution in marginally deformed backgrounds. The vacuum energy density is equivalent to that of the tachyon vacuum without marginal deformations. The gauge invariant overlap is changed according to the effect of marginal deformations, as expected from known results in CFT. These results suggest that the vacuum energy is zero for the identity-based marginal solutions in the original theory.
description: 19 pages, LaTeX with PTPTeX.cls; v2: minor corrections, references added
Gentrification Prediction with Modern Techniques
Creators: name: Gong, Yuqian
Publisher: name: University of Chicago
Year: 2021

description: Gentrification has become a critical issue in urban planning during the past half century. Ruth Glass first coined the term ‘gentrification’ in 1964 to describe the phenomenon that wealthier class replace lower-class in certain neighborhoods in cities. Often gentrification is portrayed as a tool of revitalization for those declining urban areas. It was not until 1979 when the negative consequences of gentrification, known as displacement, was fully understood. The negative socio-economic consequences of displacement including income inequalities and injustices were further investigated and evaluated in modern literature. Governments and non-profit organizations have taken efforts to actively intervene when displacement occurs through various policy responses including job training, apprenticeships, subsidized and transitional employment programs, equal opportunity laws, community reinvestment strategies and more. Besides all the efforts taken by the government after gentrification is detected, successful prediction of gentrification can help identify displacement at an early time and guide policy interventions before they become more costly and less effective. Traditional statistical methods have been applied to forecast gentrification when the negative outputs of gentrification were first noticed and came to social scientists’ attention. In 1980s and 1990s, integrating data from various sources, neighborhood early warning systems were established in big cities, including Chicago Neighborhood Early Warning System, Neighborhood Knowledge Los Angeles, the Philadelphia Neighborhood Information System and so on. Modeling methods take advantage of these systems to provide predictive analysis mainly for municipal agencies. For instance, logistic regression is used to “analyze data from the Philadelphia Neighborhood Information System in order to determine which properties were most likely to become imminently dangerous”. Multivariate regression is also a simple while commonly used method to identify key factors that make a neighborhood to gentrify. These traditional techniques often perform poorly as common measurements of gentrification such as property value cannot be modeled linearly with other features using traditional methods. Some models also fail due to high correlations among variables or autocorrelations in residuals. Therefore, it is necessary to explore innovative predicting algorithms and evaluate their performances. Some studies have sought to employ new algorithms and have found out that techniques like machine learning usually outperform those traditional ones. This project explores how well a range of machine learning models perform on predicting neighborhood gentrification with socio-economic data rather than applying traditional statistical models.
Chandra View of the Warm-Hot IGM toward 1ES 1553+113: Absorption Line Detections and Identifications (Paper I)
Creators: name: Nicastro, F.
name: Elvis, M.
name: Krongold, Y.
name: Mathur, S.
name: Gupta, A.
name: Danforth, C.
name: Barcons, X.
name: Borgani, S.
name: Branchini, E.
name: Cen, R.
name: Davé, R.
name: Kaastra, J.
name: Paerels, F.
name: Piro, L.
name: Shull, J. M.
name: Takei, Y.
name: Zappacosta, L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the first results from our pilot 500 ks Chandra-LETG Large Program observation of the soft X-ray brightest source in the z>=0.4 sky, the blazar 1ES 1553+113, aimed to secure the first uncontroversial detections of the missing baryons in the X-rays. We identify a total of 11 possible absorption lines, with single-line statistical significances between 2.2-4.1σ. Six of these lines are detected at high single-line statistical significance (3.6 <= sigma <= 4.1), while the remaining five are regarded as marginal detections in association with either other X-ray lines detected at higher significance and/or Far-Ultraviolet (FUV) signposts. In particular, five of these possible intervening absorption lines, are identified as CV and CVI Kαabsorbers belonging to three WHIM systems at z_X = 0.312, z_X = 0.237 and = 0.133, which also produce broad HI (and OVI for the z_X = 0.312 system) absorption in the FUV. For two of these systems (z_X = 0.312 and 0.237), the Chandra X-ray data led the a-posteriori discovery of physically consistent broad HI associations in the FUV, so confirming the power of the X-ray-FUV synergy for WHIM studies. The true statistical significances of these three X-ray absorption systems, after properly accounting for the number of redshift trials, are 5.8 sigma (z_X = 0.312; 6.3 sigma if the low-significance OV and CV K-beta associations are considered), 3.9 sigma (z_X = 0.237), and 3.8 sigma (\langle z_X \rangle = 0.133), respectively.
description: 27 pages, 9 figures, Accepted for publication by the ApJ
Health care providers payment reforms in African states of the Commonwealth of Nations
Creators: name: Ndayishimiye, Costase
name: Tambor, Marzena
name: Dubas-Jakóbczyk, Katarzyna
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Public Health
subject: Public Affairs, Public Policy and Public Administration
subject: Social and Behavioral Sciences
subject: Health Policy
subject: Medicine and Health Sciences
subject: strategic purchasing
subject: health care provider
subject: African countries
subject: health care reform
subject: payment reform

description: Scoping literature review
Dielectric study of the glass transition of PET/PEN blends
Creators: name: Sellares, J.
name: Diego, J. A.
name: Canadas, J. C.
name: Mudarra, M.
name: Belana, J.
name: Colomer, P.
name: Roman, F.
name: Calventus, Y.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: An analysis of the glass transition of four materials with similar chemical structures is performed: PET, PEN and two PET/PEN blends (90/10 and 70/30 w/w). During the melt processing of the blends transesterification reactions yield block and random PET/PEN copolymers that act as compatibilizers. The blends obtained in this way have been characterized by 1H-NMR and DSC. A degree of randomness of 0.38 and 0.26 has been found for the 90/10 and 70/30 copolymers. It is shown by DSC that this copolimerization is enough to compatibilize the blends. The alpha relaxation, the dielectric manifestation of the glass transition, has been studied by thermally stimulated depolarization currents (TSDC). The relaxation has been analyzed into its elementary modes by means of a relaxation map analysis. The activation energies of the modes of the glass transition do not change significantly between the four materials: in all cases the modes with a larger contribution have around 3 eV and modes with less than 1 eV are not detected. The change in the pre-exponential factor accounts entirely for the relaxation time change from material to material, that is larger as the PEN content increases. The compensation law is fulfilled and compensation plots converge for high-frequency modes. The polarizability decreases as the PEN content increases due to the increased stiffness of the polymer backbone. An analysis of the cooperativity shows that the central modes of the distribution are the most cooperative while high-frequency modes tend to behave more as Arrhenius. The low-frequency modes are difficult to study due to the asymmetry of the distribution of relaxation times. PEN turns out to be the less cooperative material. It is demonstrated how the parameters obtained from the dielectric study are able to reproduce calorimetric data from DSC scans and are, therefore, a valid description of the glass transition.
description: 22 pages, 13 figures
Chelodina rugosa Daly River, NT
Creators: name: Georges, Arthur
name: Adams, Mark
name: McCORD, William
Publisher: name: Zenodo
Year: 2002
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Reptilia
Testudines
Chelidae
Chelodina
Chelodina rugosa

description: Chelodina rugosa:
Daly River, NT [14°05'S 131°13'E, N = 11]; Darwin Region, NT [12°27'S 130°50'E, N = 20]; Gilbert River, QLD [18°17'S 143°33'E, N = 3]; Jardine River, Qld [10°47'S 142°27'E, N = 1]; Mitchell River, Qld [N = 1]; Robinson River, NT [16°13'S 137°02'E, N = 4]; South Alligator River, NT [12°28'S 132°30'E, N = 5]; Vouchers: NTM R16334, R13430, R13434-5, R13437, R13439.
description: Published as part of Georges, Arthur, Adams, Mark & McCORD, William, 2002, Electrophoretic delineation of species boundaries within the genus Chelodina (Testudines: Chelidae) of Australia, New Guinea and Indonesia, pp. 401-421 in Zoological Journal of the Linnean Society 134 (4) on page 407, DOI: 10.1046/j.1096-3642.2002.00007.x, http://zenodo.org/record/5434026
A note on p-values interpreted as plausibilities
Creators: name: Martin, Ryan
name: Liu, Chuanhai
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: Methodology (stat.ME)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: P-values are a mainstay in statistics but are often misinterpreted. We propose a new interpretation of p-value as a meaningful plausibility, where this is to be interpreted formally within the inferential model framework. We show that, for most practical hypothesis testing problems, there exists an inferential model such that the corresponding plausibility function, evaluated at the null hypothesis, is exactly the p-value. The advantages of this representation are that the notion of plausibility is consistent with the way practitioners use and interpret p-values, and the plausibility calculation avoids the troublesome conditioning on the truthfulness of the null. This connection with plausibilities also reveals a shortcoming of standard p-values in problems with non-trivial parameter constraints.
description: 13 pages, 1 figure
Forschungsdatengesetz – Ein Gesetz für die Forschung? Ein Gesetz zum Schutz der Forschung? Ein Gesetz zum Schutz der Forschungsfreiheit?
Creators: name: Jungbauer-Gans, Monika
Publisher: name: Zenodo
Year: 2023
Subjects: SaxFDM
SaxFDM-Tagung 2023
FDM
Forschungsdatengesetz
RatSWD
RDM

description: Der Wert von datenbasierten wissenschaftlichen Analysen ist in Zeiten von Krisen besonders offensichtlich. Umso gravierender machen sich Defizite in der deutschen Datenlandschaft bemerkbar, wenn erforderliche Daten nicht zugänglich oder erst gar nicht vorhanden sind. Dies erschwert nicht nur eine evidenzbasierte Politikberatung, sondern birgt große Nachteile für den Wissenschaftsstandort Deutschland. Das nun geplante Forschungsdatengesetz soll daher Abhilfe schaffen. Bereits im Juni 2022 formulierte der Rat für Sozial- und Wirtschaftsdaten (RatSWD) in einem Positionspapier Eckpunkte für das geplante Forschungsdatengesetz. Darin fordert der RatSWD insbesondere einen diskriminierungsfreien Zugang zu Daten für die Wissenschaft sowie Vertraulichkeit von Forschungsdaten. Was jetzt für die Umsetzung des Gesetzes zentral ist, um eine ganzheitliche Verbesserung für die Wissenschaft zu erreichen, beleuchtete Prof. Dr. Monika Jungbauer-Gans in ihrem Vortrag.
Der RatSWD berät seit 2004 die Bundesregierung und die Regierungen der Länder in Fragen der Forschungsdateninfrastruktur für die empirischen Sozial-, Verhaltens- und Wirtschaftswissenschaften. Der RatSWD ist Teil des Konsortiums für die Sozial-, Verhaltens-, Bildungs- und Wirtschaftswissenschaften (KonsortSWD) in der Nationalen Forschungsdateninfrastruktur (NFDI). Er versteht sich als institutionalisiertes Forum des Dialoges zwischen Wissenschaft und Datenproduzenten und erarbeitet Empfehlungen und Stellungnahmen. Dabei engagiert er sich für eine Infrastruktur, die der Wissenschaft einen breiten, flexiblen und sicheren Datenzugang ermöglicht. Diese Daten werden von staatlichen, wissenschaftsgetragenen und privatwirtschaftlichen Akteuren bereitgestellt. Derzeit hat der RatSWD 42 Forschungsdatenzentren (Stand: September 2023) akkreditiert und fördert deren Kooperation.
The model muddle: in search of tumour growth laws
Creators: name: Gerlee, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Tissues and Organs (q-bio.TO)
subject: FOS: Biological sciences

description: In this article we shall trace the historical development of tumour growth laws, which in a quantitative fashion describe the increase in tumour mass/volume over time. These models are usually formulated in terms of differential equations that relate the growth rate of the tumour to its current state, and range from the simple one-parameter exponential growth model, to more advanced models that contain a large number of parameters. Understanding the assumptions and consequences of such models is important, since they often underpin more complex models of tumour growth. The conclusion of this brief survey is that although much improvement has occurred over the last century, more effort and new models are required if we are to understand the intricacies of tumour growth.
Impurity model for non-equilibrium steady states
Creators: name: Aron, Camille
name: Weber, Cedric
name: Kotliar, Gabriel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose an out-of-equilibrium impurity model for the dynamical mean-field description of the Hubbard model driven by a finite electric field. The out-of-equilibrium impurity environment is represented by a collection of equilibrium reservoirs at different chemical potentials. We discuss the validity of the impurity model and propose a non-perturbative method, based on a quantum Monte Carlo solver, which provides the steady-state solutions of the impurity and original lattice problems. We discuss the relevance of this approach to other non-equilibrium steady-state contexts.
description: 5 pages, 4 figures
The VIMOS Public Extragalactic Redshift Survey (VIPERS): spectral classification through Principal Component Analysis
Creators: name: Marchetti, A.
name: Granett, B. R.
name: Guzzo, L.
name: Fritz, A.
name: Garilli, B.
name: Scodeggio, M.
name: Abbas, U.
name: Adami, C.
name: Arnouts, S.
name: Bolzonella, M.
name: Bottini, D.
name: Cappi, A.
name: Coupon, J.
name: Cucciati, O.
name: De Lucia, G.
name: de la Torre, S.
name: Franzetti, P.
name: Fumana, M.
name: Ilbert, O.
name: Iovino, A.
name: Krywult, J.
name: Brun, V. Le
name: Fevre, O. Le
name: Maccagni, D.
name: Malek, K.
name: Marulli, F.
name: McCracken, H. J.
name: Meneux, B.
name: Paioro, L.
name: Polletta, M.
name: Pollo, A.
name: Schlagenhaufer, H.
name: Tasca, L.
name: Tojeiro, R.
name: Vergani, D.
name: Zanichelli, A.
name: Bel, J.
name: Bersanelli, M.
name: Blaizot, J.
name: Branchini, E.
name: Burden, A.
name: Davidzon, I.
name: Di Porto, C.
name: Guennou, L.
name: Marinoni, C.
name: Mellier, Y.
name: Moscardini, L.
name: Nichol, R. C.
name: Peacock, J. A.
name: Percival, W. J.
name: Phleps, S.
name: Schimd, C.
name: Wolk, M.
name: Zamorani, G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We develop a Principal Component Analysis aimed at classifying a sub-set of 27,350 spectra of galaxies in the range 0.4 < z < 1.0 collected by the VIMOS Public Extragalactic Redshift Survey (VIPERS). We apply an iterative algorithm to simultaneously repair parts of spectra affected by noise and/or sky residuals, and reconstruct gaps due to rest-frame transformation, and obtain a set of orthogonal spectral templates that span the diversity of galaxy types. By taking the three most significant components, we find that we can describe the whole sample without contamination from noise. We produce a catalogue of eigen-coefficients and template spectra that will be part of future VIPERS data releases. Our templates effectively condense the spectral information into two coefficients that can be related to the age and star formation rate of the galaxies. We examine the spectrophotometric types in this space and identify early, intermediate, late and starburst galaxies.
description: 15 pages, 20 images, accepted for publication in MNRAS: MN-12-1739-MJ.R1
Adiabatic pumping through an interacting quantum dot with spin-orbit coupling
Creators: name: Rojek, Stephan
name: König, Jürgen
name: Shnirman, Alexander
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study adiabatic pumping through a two-level quantum dot with spin-orbit coupling. Using a diagrammatic real-time approach, we calculate both the pumped charge and spin for a periodic variation of the dot's energy levels in the limit of weak tunnel coupling. Thereby, we compare the two limits of vanishing and infinitely large charging energy on the quantum dot. We discuss the dependence of the pumped charge and pumped spin on gate voltages, the symmetry in the tunnel-matrix elements and spin-orbit coupling strength. We identify the possibility to generate pure spin currents in the absence of charge currents.
On the compactness of the set of invariant Einstein metrics
Creators: name: Graev, Michail M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C30

description: Let $M = G/H$ be a connected simply connected homogeneous manifold of a compact, not necessarily connected Lie group $G$. We will assume that the isotropy $H$-module $\mathfrak {g/h}$ has a simple spectrum, i.e. irreducible submodules are mutually non-equivalent. There exists a convex Newton polytope $N=N(G,H)$, which was used for the estimation of the number of isolated complex solutions of the algebraic Einstein equation for invariant metrics on $G/H$ (up to scaling). Using the moment map, we identify the space $\mathcal{M}_1$ of invariant Riemannian metrics of volume 1 on $G/H$ with the interior of this polytope $N$. We associate with a point ${x \in \partial N}$ of the boundary a homogeneous Riemannian space (in general, only local) and we extend the Einstein equation to $\bar{\mathcal{M}_1}= N$. As an application of the Aleksevsky--Kimel'fel'd theorem, we prove that all solutions of the Einstein equation associated with points of the boundary are locally Euclidean. We describe explicitly the set $T\subset \partial N$ of solutions at the boundary together with its natural triangulation. Investigating the compactification $\bar{\mathcal{M}_1} $ of $\mathcal{M}_1$, we get an algebraic proof of the deep result by Böhm, Wang and Ziller about the compactness of the set $ \mathcal{E}_1 \subset \mathcal{M}_1$ of Einstein metrics. The original proof by Böhm, Wang and Ziller was based on a different approach and did not use the simplicity of the spectrum. In Appendix we consider the non-symmetric Kähler homogeneous spaces $G/H$ with the second Betti number $b_2=1$. We write the normalized volumes $2,6,20,82,344$ of the corresponding Newton polytopes and discuss the number of complex solutions of the algebraic Einstein equation and the finiteness problem.
description: 25 pages, 4 figures. Some proofs, 3 references, and Appendix added
Reconstruction of Gaussian and log-normal fields with spectral smoothness
Creators: name: Oppermann, Niels
name: Selig, Marco
name: Bell, Michael R.
name: Enßlin, Torsten A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Methodology (stat.ME)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We develop a method to infer log-normal random fields from measurement data affected by Gaussian noise. The log-normal model is well suited to describe strictly positive signals with fluctuations whose amplitude varies over several orders of magnitude. We use the formalism of minimum Gibbs free energy to derive an algorithm that uses the signal's correlation structure to regularize the reconstruction. The correlation structure, described by the signal's power spectrum, is thereby reconstructed from the same data set. We show that the minimization of the Gibbs free energy, corresponding to a Gaussian approximation to the posterior marginalized over the power spectrum, is equivalent to the empirical Bayes ansatz, in which the power spectrum is fixed to its maximum a posteriori value. We further introduce a prior for the power spectrum that enforces spectral smoothness. The appropriateness of this prior in different scenarios is discussed and its effects on the reconstruction's results are demonstrated. We validate the performance of our reconstruction algorithm in a series of one- and two-dimensional test cases with varying degrees of non-linearity and different noise levels.
description: 18 pages, 12 figures
Radio Galaxy Zoo EMU: Towards a Semantic Radio Galaxy Morphology Taxonomy
Creators: name: Bowles, Micah
name: Tang, Hongming
name: Vardoulaki, Eleni
name: Alexander, Emma L.
name: Luo, Yan
name: Rudnick, Lawrence
name: Walmsley, Mike
name: Porter, Fiona
name: Scaife, Anna M. M.
name: Slijepcevic, Inigo Val
name: Adams, Elizabeth A. K.
name: Drabent, Alexander
name: Dugdale, Thomas
name: Gürkan, Gülay
name: Hopkins, Andrew M.
name: Jimenez-Andrade, Eric F.
name: Leahy, Denis A.
name: Norris, Ray P.
name: Rahman, Syed Faisal ur
name: Ouyang, Xichang
name: Segal, Gary
name: Shabala, Stanislav S.
name: Wong, O. Ivy
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a novel natural language processing (NLP) approach to deriving plain English descriptors for science cases otherwise restricted by obfuscating technical terminology. We address the limitations of common radio galaxy morphology classifications by applying this approach. We experimentally derive a set of semantic tags for the Radio Galaxy Zoo EMU (Evolutionary Map of the Universe) project and the wider astronomical community. We collect 8,486 plain English annotations of radio galaxy morphology, from which we derive a taxonomy of tags. The tags are plain English. The result is an extensible framework which is more flexible, more easily communicated, and more sensitive to rare feature combinations which are indescribable using the current framework of radio astronomy classifications.
description: 17 pages, 11 Figures, Accepted at MNRAS
Degrees of Freedom of the 3-User Rank-Deficient MIMO Interference Channel
Creators: name: Zeng, Yong
name: Xu, Xiaoli
name: Guan, Yong Liang
name: Gunawan, Erry
name: Wang, Chenwei
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We provide the degrees of freedom (DoF) characterization for the $3$-user $M_T\times M_R$ multiple-input multiple-output (MIMO) interference channel (IC) with \emph{rank-deficient} channel matrices, where each transmitter is equipped with $M_T$ antennas and each receiver with $M_R$ antennas, and the interfering channel matrices from each transmitter to the other two receivers are of ranks $D_1$ and $D_2$, respectively. One important intermediate step for both the converse and achievability arguments is to convert the fully-connected rank-deficient channel into an equivalent partially-connected full-rank MIMO-IC by invertible linear transformations. As such, existing techniques developed for full-rank MIMO-IC can be incorporated to derive the DoF outer and inner bounds for the rank-deficient case. Our result shows that when the interfering links are weak in terms of the channel ranks, i.e., $D_1+D_2\leq \min(M_T, M_R)$, zero forcing is sufficient to achieve the optimal DoF. On the other hand, when $D_1+D_2> \min(M_T, M_R)$, a combination of zero forcing and interference alignment is in general required for DoF optimality. The DoF characterization obtained in this paper unifies several existing results in the literature.
description: 28 pages, 7 figures. To appear in IEEE transactions on wireless communications
Ion chains in high-finesse cavities
Creators: name: Cormick, Cecilia
name: Morigi, Giovanna
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We analyze the dynamics of a chain of singly-charged ions confined in a linear Paul trap and which couple with the mode of a high-finesse optical resonator. In these settings the ions interact via the Coulomb repulsion and are subject to the mechanical forces due to scattering of cavity photons. We show that the interplay of these interactions can give rise to bistable equilibrium configurations, into which the chain can be cooled by cavity-enhanced photon scattering. We characterize the resulting equilibrium structures by determining the stationary state in the semiclassical limit for both cavity field and crystal motion. The mean occupation of the vibrational modes at steady state is evaluated, showing that the vibrational modes coupled to the cavity can be simultaneously cooled to low occupation numbers. It is also found that at steady state the vibrations are entangled with the cavity field fluctuations. The entanglement is quantified by means of the logarithmic negativity. The spectrum of the light at the cavity output is evaluated and the features signaling entanglement are here identified.
description: 14 pages, 8 figures. Minor changes, matches the published version
Domination game played on trees and spanning subgraphs
Creators: name: Bresar, Bostjan
name: Klavzar, Sandi
name: Rall, Douglas F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C57 (Primary) 91A43, 05C69 (Secondary)

description: The domination game is played on a graph G. Vertices are chosen, one at a time, by two players Dominator and Staller. Each chosen vertex must enlarge the set of vertices of G dominated to that point in the game. Both players use an optimal strategy---Dominator plays so as to end the game as quickly as possible while Staller plays in such a way that the game lasts as many steps as possible. The game domination number of G is the number of vertices chosen when Dominator starts the game and the Staller-start game domination number of G when Staller starts the game. In this paper these two games are studied when played on trees and spanning subgraphs. A lower bound for the game domination number of a tree in terms of the order and maximum degree is proved and shown to be asymptotically tight. It is shown that for every k, there is a tree T with game domination number k and Staller-start game domination number k+1, and it is conjectured that there is no tree with game domination number k and Staller-start game domination number k-1. A relation between the game domination number of a graph and its spanning subgraphs is considered. It is proved that for any positive integer n, there exists a graph G and its spanning tree T such that the game domination number of G is at least n more than the game domination number of T. Moreover, there exist 3-connected graphs G having a spanning subgraph such that the game domination number of the spanning subgraph is arbitrarily smaller than that of G.
description: 16 pages, 9 figures
The Night Shift: Understanding Performance Variability of Cloud Serverless Platforms
Creators: name: Schirmer, Trever
name: Japke, Nils
name: Greten, Sofia
name: Pfandzelter, Tobias
name: Bermbach, David
Publisher: name: arXiv
Year: 2023
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Function-as-a-Service is a popular cloud programming model that supports developers by abstracting away most operational concerns with automatic deployment and scaling of applications. Due to the high level of abstraction, developers rely on the cloud platform to offer a consistent service level, as decreased performance leads to higher latency and higher cost given the pay-per-use model. In this paper, we measure performance variability of Google Cloud Functions over multiple months. Our results show that diurnal patterns can lead to performance differences of up to 15%, and that the frequency of unexpected cold starts increases threefold during the start of the week. This behavior can negatively impact researchers that conduct performance studies on cloud platforms and practitioners that run cloud applications.
description: Author's copy of paper accepted at the 1st Workshop on SErverless Systems, Applications and MEthodologies (SESAME '23)
Projective bundles over toric surfaces
Creators: name: Choi, Suyoung
name: Park, Seonjeong
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 57S25, 57R19, 57R20 (Primary) 14M25 (Secondary)

description: Let $E$ be the Whitney sum of complex line bundles over a topological space $X$. Then, the projectivization $P(E)$ of $E$ is called a \emph{projective bundle} over $X$. If $X$ is a non-singular complete toric variety, so is $P(E)$. In this paper, we show that the cohomology ring of a non-singular projective toric variety $M$ determines whether it admits a projective bundle structure over a non-singular complete toric surface. In addition, we show that two 6-dimensional projective bundles over 4-dimensional quasitoric manifolds are diffeomorphic if their cohomology rings are isomorphic as graded rings. Furthermore, we study the smooth classification of higher dimensional projective bundles over 4-dimensional quasitoric manifolds.
description: 24 pages
Demonstration of quantum entanglement between a single electron spin confined to an InAs quantum dot and a photon
Creators: name: Schaibley, J. R.
name: Burgers, A. P.
name: McCracken, G. A.
name: Duan, L. -M.
name: Berman, P. R.
name: Steel, D. G.
name: Bracker, A. S.
name: Gammon, D.
name: Sham, L. J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electron spin state of a singly charged semiconductor quantum dot has been shown to form a suitable single qubit for quantum computing architectures with fast gate times. A key challenge in realizing a useful quantum dot quantum computing architecture lies in demonstrating the ability to scale the system to many qubits. In this letter, we report an all optical experimental demonstration of quantum entanglement between a single electron spin confined to single charged semiconductor quantum dot and the polarization state of a photon spontaneously emitted from the quantum dot's excited state. We obtain a lower bound on the fidelity of entanglement of 0.59, which is 84% of the maximum achievable given the timing resolution of available single photon detectors. In future applications, such as measurement based spin-spin entanglement which does not require sub-nanosecond timing resolution, we estimate that this system would enable near ideal performance. The inferred (usable) entanglement generation rate is 3 x 10^3 s^-1. This spin-photon entanglement is the first step to a scalable quantum dot quantum computing architecture relying on photon (flying) qubits to mediate entanglement between distant nodes of a quantum dot network.
Bures and Hilbert-Schmidt 2 x 2 Determinantal Moments
Creators: name: Slater, Paul B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We seek to gain insight into the nature of the determinantal moments of generic (9-dimensional) two-rebit and (15-dimensional) two-qubit systems (rho). Such information-as it has proved to be in the Hilbert-Schmidt counterpart--should be useful, employing probability-distribution reconstruction (inverse) procedures, in obtaining improved, or possibly even exact Bures 2 x 2 separability probabilities for such systems. The (regularizing) strategy we first adopt is to plot the ratio of numerically-generated (Ginibre ensemble) estimates of the Bures moments to the corresponding (apparently) exactly-known Hilbert-Schmidt moments (J. Phys. A, 45, 095305 [2012]). Then, through a combination of symbolic and numerical computations, we obtain strong evidence as to the exact values (and underlying patterns) of certain Bures moments. In particular, the first moment (average) of |rho^{PT}| (where |rho^{PT}| in [-1/16, 1/256]), PT denoting partial transpose, for the two-qubit systems is, remarkably, -1 / 256. The analogous value for the two-rebit systems is -2663/(2^(13) x 3 x 5 x 7) approx -0.00309594. While, an important function in the Hilbert-Schmidt case is the ratio of 3n-degree polynomials, it appears to be the ratio of 5n-degree polynomials in the Bures case.
description: 14 pages, 7 figures, expanded introduction, to appear in J. Phys. A
Linearized Gravitational Waves in Nonlocal General Relativity
Creators: name: Chicone, C.
name: Mashhoon, B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate gravitational radiation in the linear approximation within the framework of the recent nonlocal generalization of Einstein's theory of gravitation. In this theory, nonlocality can simulate dark matter; in fact, in the Newtonian regime, we recover the phenomenological Tohline-Kuhn approach to modified gravity. To account for the observational data regarding the rotation curves of spiral galaxies, nonlocality is associated with a characteristic length scale of order λ_0 = 10 kpc. It follows that in nonlocal gravity, the treatment of extremely low-frequency (~ 10^{-12} Hz) gravitational waves with wavelengths of order λ_0 would be quite different than in general relativity. However, for radiation of frequency > 10^{-8} Hz, which is the frequency range that is the focus of current observational searches, the corresponding wavelengths are very small compared to λ_0. We find that in this frequency regime the nonlocal deviations from general relativity essentially average out and can be safely neglected in practice.
description: 30 pages, 1 figure; v2: slightly expanded and improved version
Homology of Littlewood complexes
Creators: name: Sam, Steven V
name: Snowden, Andrew
name: Weyman, Jerzy
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: Commutative Algebra (math.AC)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05E10, 13D02, 15A72, 20G05

description: Let V be a symplectic vector space of dimension 2n. Given a partition λwith at most n parts, there is an associated irreducible representation S_{[λ]}(V) of Sp(V). This representation admits a resolution by a natural complex L^λ, which we call the Littlewood complex, whose terms are restrictions of representations of GL(V). When λhas more than n parts, the representation S_{[λ]}(V) is not defined, but the Littlewood complex L^λstill makes sense. The purpose of this paper is to compute its homology. We find that either L^λis acyclic or that it has a unique non-zero homology group, which forms an irreducible representation of Sp(V). The non-zero homology group, if it exists, can be computed by a rule reminiscent of that occurring in the Borel-Weil-Bott theorem. This result can be interpreted as the computation of the "derived specialization" of irreducible representations of Sp(\infty), and as such categorifies earlier results of Koike-Terada on universal character rings. We prove analogous results for orthogonal and general linear groups. Along the way, we will see two topics from commutative algebra: the minimal free resolutions of determinantal ideals and Koszul homology.
description: 32 pages; v2: corrected minor typos and changed theorem/equation numbering
Die alamannische Besiedlung des Geislinger Talkessels (Markungen Altenstadt und Geislingen, Stadt Geislingen a. d. Steige, Lkr. Göppingen)
Creators: name: Schreg, Rainer
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2019

description: Fundberichte aus Baden-Württemberg, Bd. 23 (1999): Fundberichte aus Baden-Württemberg
Inner products of Bethe states as partial domain wall partition functions
Creators: name: Kostov, Ivan
name: Matsuo, Yutaka
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the inner product of Bethe states in the inhomogeneous periodic XXX spin-1/2 chain of length L, which is given by the Slavnov determinant formula. We show that the inner product of an on-shell M-magnon state with a generic M-magnon state is given by the same expression as the inner product of a 2M-magnon state with a vacuum descendent. The second inner product is proportional to the partition function of the six-vertex model on a rectangular Lx2M grid, with partial domain-wall boundary conditions.
description: 14 pages, 6 figures, typos corrected and a reference added
R. Brosig, Die Verfassung des Saarlandes. Entstehung und Entwicklung, 2001
Creators: name: Elzer, Herbert
Publisher: name: Francia
Year: 2019

description: R. Brosig, Die Verfassung des Saarlandes. Entstehung und Entwicklung, 2001 (H. Elzer)
description: Francia, Bd. 30 Nr. 3 (2003)
Chelodina seibenrocki Binaturi River
Creators: name: Georges, Arthur
name: Adams, Mark
name: McCORD, William
Publisher: name: Zenodo
Year: 2002
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Reptilia
Testudines
Chelidae
Chelodina
Chelodina seibenrocki

description: Chelodina seibenrocki:
Binaturi River, PNG [N = 2]; Merauke River, West Irian [c. 8°28'S 140°20'E, N = 10].
description: Published as part of Georges, Arthur, Adams, Mark & McCORD, William, 2002, Electrophoretic delineation of species boundaries within the genus Chelodina (Testudines: Chelidae) of Australia, New Guinea and Indonesia, pp. 401-421 in Zoological Journal of the Linnean Society 134 (4) on page 407, DOI: 10.1046/j.1096-3642.2002.00007.x, http://zenodo.org/record/5434026
G.-H. Soutou, La guerre de Cinquante Ans. Les relations Est-Ouest 1943-1990, 2001
Creators: name: Dülffer, Jost
Publisher: name: Francia
Year: 2019

description: G.-H. Soutou, La guerre de Cinquante Ans. Les relations Est-Ouest 1943-1990, 2001 (J. Dülffer)
description: Francia, Bd. 30 Nr. 3 (2003)