cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Are high velocity peaks in the Milky Way bulge due to the bar?
Creators: name: Li, Zhao-Yu
name: Shen, Juntai
name: Rich, R. Michael
name: Kunder, Andrea
name: Mao, Shude
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recently the commissioning APOGEE observations of the Galactic bulge reported that a significant fraction of stars ($\sim10%$) are in a cold ($σ_{\rm V} \approx 30$ km/s) high velocity peak (Galactocentric radial velocity $\approx 200$ km/s). These stars are speculated to reflect the stellar orbits in the Galactic bar. In this study, we use two $N$-body models of the Milky Way-like disk galaxy with different bar strengths to critically examine this possibility. The general trends of the Galactocentric radial velocity distribution in observations and simulations are similar, but neither our models nor the BRAVA data reveal a statistically significant cold high velocity peak. A Monte Carlo test further suggests that it is possible for a spurious high velocity peak to appear if there are only a limited number of stars observed. Thus, the reported cold high velocity peak, even if it is real, is unlikely due to stars on the bar-supporting orbits. Our models do predict an excess of stars with high radial velocity, but not in a distinct peak. In the distance--velocity diagram, the high velocity particles in different fields exist at a similar distance $\sim8.5 \pm 1$ kpc away from the Sun. This result may be explained with geometric intersections between the line-of-sight and the particle orbits; high velocity stars naturally exist approximately at the tangent point, without constituting a distinct peak. We further demonstrate that even without the presence of a bar structure, particle motions in an axisymmetric disk can also exhibit an excess of high velocity stars.
description: Accepted to publish in ApJL. Extra discussion and new Figure 2 were added to discuss a possible false peak due to small number statistics. Main conclusions remain unchanged
Sonnenfleckenzeichnung Nr. 28099.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 16.01.1990, erstellt von Hans Ulrich Keller
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Zeiss Coudé-Refraktor (150/2250 mm).
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
Quantum entanglement of masses with non-local gravitational interaction
Creators: name: Vinckers, Ulrich K. Beckering
name: de la Cruz-Dombriz, Álvaro
name: Mazumdar, Anupam
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We examine the quantum gravitational entanglement of two test masses in the context of linearized General Relativity with specific non-local interaction with matter. To accomplish this, we consider an energy-momentum tensor describing two test particles of equal mass with each possessing some non-zero momentum. After discussing the quantization of the linearized theory, we compute the gravitational energy shift which is operator-valued in this case. As compared to the local gravitational interaction, we find that the change in the gravitational energy due to the self-interaction terms is finite. We then move on to study the quantum gravity induced entanglement of masses for two different scenarios. The first scenario involves treating the two test masses as harmonic oscillators with an interaction Hamiltonian given by the aforesaid gravitational energy shift. In the second scenario, each of the test masses is placed in a quantum spatial superposition of two locations, based on their respective spin states, and their entanglement being induced by the gravitational interaction and the shift in the vacuum energy. For these two scenarios, we compute both the concurrence and the von Neumann entropy; showing that an increase in the non-locality of the gravitational interaction results in a decrease in both of these quantities.
description: 12 pages, 3 figures, version published in PRD
A multiwavelength analysis of BL Hers: Models vs Observations
Creators: name: Das, Susmita
Publisher: name: Zenodo
Year: 2023

description: We present new theoretical period-luminosity (PL), period-Wesenheit (PW) amd period-radius (PR) relations at multiple wavelengths (Johnson-Cousin-Glass bands UBVRIJHKLL'M and Gaia passbands GG BP G RP ) for a fine grid of convective BL Herculis models computed using the non-linear radial stellar pulsation tool MESA-RSP. The non-linear models were computed for periods typical for BL Her stars, i.e. 1≤P (days)≤4 covering a wide range of input parameters: metallicity (-2.0 dex≤ [Fe/H]≤ 0.0 dex), stellar mass (0.5M ⊙ -0.8M ⊙ ), luminosity (50L ⊙ -300L ⊙ ) and effective temperature (full extent of the instability strip; in steps of 50K). We investigate the impact of four sets of different convection parameters on multi-wavelength properties. Most empirical relations match well with the theoretical PL, PW and PR relations from the BL Her models computed using the four sets of convection parameters. However, PL slopes of the models with radiative cooling provide a better match to empirical relations for BL Her stars in the LMC in the G-band and the HK S bands. No significant metallicity effects are seen in the PR relations. Another important result from our grid of BL Her models is that it supports the equivalence of the PL relations of RR Lyrae and T2Cs, thereby providing us the opportunity of adopting RRLs + T2Cs together as an alternative to classical Cepheids for the extragalactic distance scale calibration.
Sonnenfleckenzeichnung Nr. 28185.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 12.07.1990, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Sonnenturm
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Coelostat/Teleskop: Das Sonnenlicht wurde über einen Coelostat in eine Vertikalachse, anschliessend von einem Umlenkungsspiegel durch ein Horizontalteleskop gelenkt, und von dessen Okular auf das vertikal fixierte "Sonnenblatt" projiziert.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
Chemical evolution in the early phases of massive star formation. I
Creators: name: Gerner, T.
name: Beuther, H.
name: Semenov, D.
name: Linz, H.
name: Vasyunina, T.
name: Bihr, S.
name: Shirley, Y. L.
name: Henning, Th.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Understanding the chemical evolution of young (high-mass) star-forming regions is a central topic in star formation research. Chemistry is employed as a unique tool 1) to investigate the underlying physical processes and 2) to characterize the evolution of the chemical composition. We observed a sample of 59 high-mass star-forming regions at different evolutionary stages varying from the early starless phase of infrared dark clouds to high-mass protostellar objects to hot molecular cores and, finally, ultra-compact HII regions at 1mm and 3mm with the IRAM 30m telescope. We determined their large-scale chemical abundances and found that the chemical composition evolves along with the evolutionary stages. On average, the molecular abundances increase with time. We modeled the chemical evolution, using a 1D physical model where density and temperature vary from stage to stage coupled with an advanced gas-grain chemical model and derived the best-fit chi^2 values of all relevant parameters. A satisfying overall agreement between observed and modeled column densities for most of the molecules was obtained. With the best-fit model we also derived a chemical age for each stage, which gives the timescales for the transformation between two consecutive stages. The best-fit chemical ages are ~10,000 years for the IRDC stage, ~60,000 years for the HMPO stage, ~40,000 years for the HMC stage, and ~10,000 years for the UCHII stage. The total chemical timescale for the entire evolutionary sequence of the high-mass star formation process is on the order of 10^5 years, which is consistent with theoretical estimates. Furthermore, based on the approach of a multiple-line survey of unresolved data, we were able to constrain an intuitive and reasonable physical and chemical model. The results of this study can be used as chemical templates for the different evolutionary stages in high-mass star formation.
description: 31 pages, 11 figures, 21 tables, accepted by A&A; typos added
Project "Vulnerable Languages and Linguistic Varieties in Serbia" – linguacultural aspects of the questionnaires*
Creators: name: Sokolović, Dalibor
name: Paunović Rodić, Stefana
Publisher: name: Zenodo
Year: 2022
Subjects: vulnerable languages
vulnerable varieties
questionnaire

description: The presentation is about the linguacultural aspects of the questionnaire designed within the project "Vulnerable Languages and Linguistic Varieties in Serbia“, funded by the Science Fund of the Republic of Serbia.
Reducing inequities in children’s reading skills. Research snapshot #3.
Creators: name: Goldfeld, Sharon
name: O'Connor, Elodie
name: Guo, Shuaijun
name: Pham, Cindy
name: Gray, Sarah
Publisher: name: Murdoch Childrens Research Institute
Year: 2023
Subjects: Health Sciences

description: This research snapshot explores what happens to children’s risk of poor reading skills if all children were provided with the same rates of home reading and preschool attendance as children not experiencing disadvantage.
Sonnenfleckenzeichnung Nr. 28171.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 20.06.1990, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Sonnenturm
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Coelostat/Teleskop: Das Sonnenlicht wurde über einen Coelostat in eine Vertikalachse, anschliessend von einem Umlenkungsspiegel durch ein Horizontalteleskop gelenkt, und von dessen Okular auf das vertikal fixierte "Sonnenblatt" projiziert.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
Sonnenfleckenzeichnung Nr. 28233.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 19.10.1990, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Sonnenturm
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Coelostat/Teleskop: Das Sonnenlicht wurde über einen Coelostat in eine Vertikalachse, anschliessend von einem Umlenkungsspiegel durch ein Horizontalteleskop gelenkt, und von dessen Okular auf das vertikal fixierte "Sonnenblatt" projiziert.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
The temperature of the diffuse HI in the Milky Way II: Gaussian decomposition of the HI 21 cm absorption spectra
Creators: name: Roy, Nirupam
name: Kanekar, Nissim
name: Chengalur, Jayaram N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We discuss physical conditions in Galactic neutral hydrogen based on deep, high velocity resolution interferometric HI 21 cm absorption spectroscopy towards 33 compact extra-galactic radio sources. The HI 21 cm optical depth spectra have root-mean-square noise values \lesssim 10^{-3} per 1 km/s velocity channel, i.e., sufficiently sensitive to detect HI 21 cm absorption by the warm neutral medium (WNM). Comparing these spectra with HI 21 cm emission spectra from the Leiden-Argentine-Bonn (LAB) survey, we show that some of the absorption detected on most sightlines must arise in gas with temperatures higher than that in the stable cold neutral medium (CNM). A multi-Gaussian decomposition of 30 of the HI 21 cm absorption spectra yielded very few components with line widths in the temperature range of stable WNM, with no such WNM components detected for sixteen of the thirty sightlines. We find that some of the detected HI 21 cm absorption along thirteen of these sightlines must arise in gas with spin temperatures larger than the CNM range. For these sightlines, we use very conservative estimates of the CNM spin temperature and the non-thermal broadening to derive strict upper limits to the gas column densities in the CNM and WNM phases. Comparing these upper limits to the total HI column density, we find that typically at least 28% of the gas must have temperatures in the thermally unstable range (200-5000 K). Our observations hence robustly indicate that a significant fraction of the gas in the Galactic interstellar medium has temperatures outside the ranges expected for thermally stable gas in two-phase models.
description: 18 pages, 8 figures. Accepted for publication in MNRAS. The definitive version will be available at http://mnras.oxfordjournals.org/
Sonnenfleckenzeichnung Nr. 28239.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 07.11.1990, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Sonnenturm
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Coelostat/Teleskop: Das Sonnenlicht wurde über einen Coelostat in eine Vertikalachse, anschliessend von einem Umlenkungsspiegel durch ein Horizontalteleskop gelenkt, und von dessen Okular auf das vertikal fixierte "Sonnenblatt" projiziert.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
title: Der Bluthund; [1848]
title: Melodie: "Prinz Eugen der edle Ritter."
titleType: Subtitle
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Kopftitel. - Textanfang: Windischgrätz, der schuft'ge Ritter Wollt dem Kaiser wied'rum kriegen Seine schöen Hauptstadt Wien; ließ marschieren die Kroaten ... - Enth. außerdem: Herbstgedanken / T....y. - Gedichte. - Vorlageform des Erscheinungsvermerks: Gedruckt und zu haben bei August Stritt in Frankfurt a. M. Rosengasse No. 3
Weak Antilocalization and Linear Magnetoresistance in The Surface State of SmB6
Creators: name: Thomas, S.
name: Kim, D. J.
name: Chung, S. B.
name: Grant, T.
name: Fisk, Z.
name: Xia, Jing
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Strongly correlated Kondo insulator SmB6 is known for its peculiar low temperature residual conduction, which has recently been demonstrated to arise from a robust metallic surface state, as predicted by the theory of topological Kondo insulator (TKI). Photoemission, quantum oscillation and magnetic doping experiments have provided evidence for the Dirac-like dispersion and topological protection. Questions arise as whether signatures of spin-momentum locking and electron interaction could be resolved in transport measurements. Here we report metallic conduction of surface state down to mK temperatures with saturation behaviors suggestive of Kondo effect. We observe in the surface state the weak-antilocalization (WAL) effect that is in agreement with a spin-momentum locked metallic surface. At larger perpendicular magnetic fields, the surface state exhibits an unusual linear magnetoresistance similar to those found in Bi-based topological insulators and in graphene. (Correspondence to: xia.jing@uci.edu)
Spectral ageing in the lobes of FR-II radio galaxies: New methods of analysis for broadband radio data
Creators: name: Harwood, Jeremy
name: Hardcastle, Martin
name: Croston, Judith
name: Goodger, Joanna
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The broad-bandwidth capabilities of next generation telescopes such as the JVLA mean that the spectrum of any given source varies significantly within the bandwidth of any given observation. Detailed spectral analysis taking this variation into account is set to become standard practice when dealing with any new broadband radio observations; it is therefore vital that methods are developed to handle this new type of data. In this paper, we present the Broadband Radio Astronomy ToolS (BRATS) software package and, use it to carry out detailed analysis of JVLA observations of three powerful radio galaxies. We compare two of the most widely used models of spectral ageing, the Kardashev-Pacholczyk and Jaffe-Perola models and also results of the more complex, but potentially more realistic, Tribble model. We find that the Tribble model provides both a good fit to observations as well as providing a physically realistic description of the source. We present the first high-resolution spectral maps of our sources and find that the best-fitting injection indices across all models take higher values than has previously been assumed. We present characteristic hot spot advance speeds and make comparison to those derived from dynamical ages, confirming the previously known discrepancy in speed remains present when determined at high spectral resolutions. We show that some previously common assumptions made in determining spectral ages with narrow-band radio telescopes may not always hold and strongly suggest these are accounted for in future investigations.
description: 24 Pages, 13 Figures, 7 Tables, Accepted by MNRAS
Eccentricity Growth of Massive Planets inside Cavities of Protoplanetary Discs
Creators: name: Romanova, Marina M.
name: Koldoba, Alexander V.
name: Ustyugova, Galina V.
name: Lai, Dong
name: Lovelace, Richard V. E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We carry out hydrodynamical simulations to study the eccentricity growth of a 1-30 Jupiter mass planet located inside the fixed cavity of a protoplanetary disc. The planet exchanges energy and angular momentum with the disc at resonant locations, and its eccentricity grows due to Lindblad resonances. We observe several phases of eccentricity growth where different eccentric Lindblad resonances dominate from 1:3 up to 3:5. The maximum values of eccentricity reached in our simulations are 0.65-0.75. We calculate the eccentricity growth rate for different planet masses and disc parameters and derive analytical dependencies on these parameters. We observe that the growth rate is proportional to both the planet's mass and the characteristic disc mass for a wide range of parameters. In a separate set of simulations, we derived the width of the 1:3 Lindblad resonance.
description: 19 pages, 18 figures, accepted by MNRAS
Novel quantitative trait locus is mapped to chromosome 12p11 for left ventricular mass in Dominican families: the Family Study of Stroke Risk and Carotid Atherosclerosis
Creators: name: Wang, Liyong
name: Beecham, Ashley
name: Di Tullio, Marco R.
name: Slifer, Susan
name: Blanton, Susan
name: Rundek, Tatjana
name: Sacco, Ralph
Publisher: name: Columbia University
Year: 2009
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Medicine

description: Left ventricular mass (LVM) is an important risk factor for stroke and vascular disease. The genetic basis of LVM is unclear although a high heritability has been suggested. We sought to map quantitative trait loci (QTL) for LVM using large Dominican families. Probands were selected from Dominican subjects of the population-based Northern Manhattan Study (NOMAS). LVM was measured by transthoracic echocardiography. A set of 405 microsatellite markers was used to screen the whole genome among 1360 subjects from 100 Dominican families who had complete phenotype data and DNA available. A polygenic covariate screening was run to identify the significant covariates. Variance components analysis was used to estimate heritability and to detect evidence for linkage, after adjusting for significant risk factors. Ordered-subset Analysis (OSA) was conducted to identify a more homogeneous subset for stratification analysis. LVM had a heritability of 0.58 in the studied population (p < 0.0001). The most significant evidence for linkage was found at chromosome 12p11 (MLOD = 3.11, empirical p = 0.0003) with peak marker at D12S1042. This linkage was significantly increased in a subset of families with the high average waist circumference (MLOD = 4.45, p = 0.0045 for increase in evidence for linkage). We mapped a novel QTL near D12S1042 for LVM in Dominicans. Enhanced linkage evidence in families with larger waist circumference suggests that gene(s) residing within the QTL interact(s) with abdominal obesity to contribute to phenotypic variation of LVM. Suggestive evidence for linkage (LOD = 1.99) has been reported at the same peak marker for left ventricular geometry in a White population from the HyperGEN study, underscoring the importance of this QTL for left ventricular phenotype. Further fine mapping and validation studies are warranted to identify the underpinning genes.
Soggettività e oggettività nel paesaggio simmeliano
Creators: name: Vargiu, Luca
Publisher: name: Zenodo
Year: 2022
Subjects: objectivity
subjectivity
Georg Simmel
philosophy of landscape

description: Seminario La linea sottile fra soggettività ed oggettività. Università degli Studi di Cagliari, rappresentanza studentesca delle lauree in Filosofia e in Filosofia e Teorie della Comunicazione. Cagliari, 28 e 30 novembre 2022.
UB CCD photometry of the old, metal rich, open clusters NGC 6791, NGC 6819 and NGC 7142
Creators: name: Carraro, G.
name: Buzzoni, A.
name: Bertone, E.
name: Buson, L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report on a UV-oriented imaging survey in the fields of the old, metal-rich open clusters, NGC 6791, NGC 6819 and NGC 7142. These three clusters represent both very near and ideal stellar aggregates to match the distinctive properties of the evolved stellar populations, as in elliptical galaxies and bulges of spirals. The CMD of the three clusters is analyzed in detail, with special emphasis to the hot stellar component. We report, in this regard, one new extreme horizontal-branch star candidate in NGC 6791. For NGC 6819 and 7142, the stellar luminosity function points to a looser radial distribution of faint lower Main Sequence stars, either as a consequence of cluster dynamical interaction with the Galaxy or as an effect of an increasing fraction of binary stars toward the cluster core, as actually observed in NGC 6791 too.
description: 12 pages with 15 Figures & 5 Tables. To appear in the Astronomical Journal
Dynamics of central and peripheral immunomodulation in a murine glioma model
Creators: name: Kennedy, Benjamin C.
name: Maier, Lisa
name: D'Amico, Randy
name: Mandigo, Christopher E.
name: Fontana, Elizabeth
name: Waziri, Allen
name: Assanah, Marcela
name: Canoll, Peter D.
name: Anderson, Richard
name: Anderson, David C. E.
name: Bruce, Jeffrey N.
Publisher: name: Columbia University
Year: 2009
Subjects: Pathology

description: Immunosuppression by gliomas contributes to tumor progression and treatment resistance. It is not known when immunosuppression occurs during tumor development but it likely involves cross-talk among tumor cells, tumor-associated macrophages and microglia (TAMs), and peripheral as well as tumor-infiltrating lymphocytes (TILs). We have performed a kinetic study of this immunomodulation, assessing the dynamics of immune infiltration and function, within the central nervous system (CNS) and peripherally. PDGF-driven murine glioma cells were injected into the white matter of 13 mice. Four mice were sacrificed 13 days post-injection (dpi), four mice at 26 dpi, and five mice at 40 dpi. Using multiparameter flow cytometry, splenic T cells were assessed for FoxP3 expression to identify regulatory T cells (Tregs) and production of IFN-γ and IL-10 after stimulation with PMA/ionomycin; within the CNS, CD4+ TILs were quantified, and TAMs were quantified and assessed for TNF-α and IL-10 production after stimulation with LPS. Peripheral changes associated with tumor development were noted prior to effects within the CNS. The percentage of FoxP3+ regulatory T cells (Tregs) increased by day 26, with elevated frequencies throughout the duration of the study. This early increase in Tregs was paralleled by an increase in IL-10 production from Tregs. At the final time points examined (tumor morbidity or 40 dpi), there was an increase in the frequency of TAMs with decreased capacity to secrete TNF-α. An increase in TIL frequency was also observed at these final time points. These data provide insight into the kinetics of the immunosuppressive state associated with tumor growth in a murine model of human gliomas. Functional impairment of TAMs occurs relatively late in the course of GBM tumor growth, potentially providing a window of opportunity for therapeutic strategies directed towards preventing their functional impairment.
Sonnenfleckenzeichnung Nr. 28196.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 25.07.1990, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Sonnenturm
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Coelostat/Teleskop: Das Sonnenlicht wurde über einen Coelostat in eine Vertikalachse, anschliessend von einem Umlenkungsspiegel durch ein Horizontalteleskop gelenkt, und von dessen Okular auf das vertikal fixierte "Sonnenblatt" projiziert.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
Absence of phase transition in the XY-model on Menger sponge
Creators: name: Przedborski, M. A.
name: Mitrovic, B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Superconductivity (cond-mat.supr-con)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We have performed a Monte Carlo study of the classical XY-model on a Menger sponge with the Wolff cluster algorithm (U. Wolff, 1989). The Menger sponge is a fractal object with infinite order of ramification and fractal dimension D = log(20)/log(3) = 2.7268. From the dependence of the helicity modulus on system size and on boundary conditions, we conclude that there is no phase transition in the system at any finite temperature.
description: 16 pages, 8 figures, accepted for publication in Physica A
Sonnenfleckenzeichnung Nr. 28214.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 05.09.1990, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Sonnenturm
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Coelostat/Teleskop: Das Sonnenlicht wurde über einen Coelostat in eine Vertikalachse, anschliessend von einem Umlenkungsspiegel durch ein Horizontalteleskop gelenkt, und von dessen Okular auf das vertikal fixierte "Sonnenblatt" projiziert.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
Users' guides to the medical literature: how to use an article about mortality in a humanitarian emergency
Creators: name: Mills, Edward
name: Checchi, Francesco
name: Orbinski, James
name: Schull, Michael
name: Burkle, Frederick
name: Beyrer, Chris
name: Cooper, Curtis
name: Hardy, Colleen
name: Singh, Sonal
name: Garfield, Richard M.
name: Woodruff, Bradley
name: Guyatt, Gordon
Publisher: name: Columbia University
Year: 2008
Subjects: Medical sciences
Public health

description: The accurate interpretation of mortality surveys in humanitarian crises is useful for both public health responses and security responses. Recent examples suggest that few medical personnel and researchers can accurately interpret the validity of a mortality survey in these settings. Using an example of a mortality survey from the Democratic Republic of Congo (DRC), we demonstrate important methodological considerations that readers should keep in mind when reading a mortality survey to determine the validity of the study and the applicability of the findings to their settings.
Multi-campaign Asteroseismic Analysis of eight Solar-like pulsating stars observed by the K2 mission
Creators: name: González-Cuesta, L.
name: Mathur, S.
name: García, R. A.
name: Hernández, F. Pérez
name: Delsanti, V.
name: Breton, S. N.
name: Hedges, C.
name: Jiménez, A.
name: Della Gaspera, A.
name: El-Issami, M.
name: Fox, V.
name: Godoy-Rivera, D.
name: Pitot, S.
name: Proust, N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The NASA K2 mission that succeeded the nominal Kepler mission observed several hundreds of thousands of stars during its operations. While most of the stars were observed in single campaigns of 80 days, some of them were targeted for more than one campaign. We perform an asteroseismic study of a sample of eight solar-like stars observed during K2 Campaigns 6 and 17. We first extract the light curves for the two campaigns using two different pipelines, EVEREST and Lightkurve. The seismic analysis is done on the combined light curve of C6 and C17 where the gap between them was removed and the two campaigns were stitched together. We determine the global seismic parameters of the solar-like oscillations using two different methods (A2Z pipeline and the apollinaire code). We perform the peak-bagging of the modes to characterize their individual frequencies. By combining the frequencies with the Gaia DR2 effective temperature and luminosity, and metallicity for five of the targets, we determine the fundamental parameters of the targets using the IACgrids based on the MESA code. While the masses and radii of our targets probe a similar parameter space compared to the Kepler solar-like stars with detailed modeling, we find that for a given mass our more evolved stars seem to be older compared to previous seismic stellar ensembles. We calculate the stellar parameters using two different grids of models, incorporating and excluding the treatment of diffusion, and find that the results agree generally within the uncertainties, except for the ages. The seismic radii and the Gaia DR2 radii present an average difference of 4% with a dispersion of 5%. Although the agreement is quite good, the seismic radii are slightly underestimated compared to Gaia DR2 for our stars, the disagreement being greater for the more evolved ones.
description: 10 pages (without annexes), 13 figures. Accepted for publication in A&A
Sonnenfleckenzeichnung Nr. 28199.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 28.07.1990, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Sonnenturm
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Coelostat/Teleskop: Das Sonnenlicht wurde über einen Coelostat in eine Vertikalachse, anschliessend von einem Umlenkungsspiegel durch ein Horizontalteleskop gelenkt, und von dessen Okular auf das vertikal fixierte "Sonnenblatt" projiziert.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
Sonnenfleckenzeichnung Nr. 28228.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 11.10.1990, erstellt von Hans Ulrich Keller.
Zusätzlich ist vermerkt: Sonnenturm
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Coelostat/Teleskop: Das Sonnenlicht wurde über einen Coelostat in eine Vertikalachse, anschliessend von einem Umlenkungsspiegel durch ein Horizontalteleskop gelenkt, und von dessen Okular auf das vertikal fixierte "Sonnenblatt" projiziert.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
Collaborative Conference Reflections: A Visual Journey
Creators: name: Irving-Bell, Dawne
name: Wright, Sarah
Publisher: name: The Journal of Social Media for Learning
Year: 2020

description: Using imagery from social media in this short piece we present a ‘visual feast’ of fond memories from the Social Media for Learning in Higher Education Conference held on 19th December at Edge Hill University 2019.
description: The Journal of Social Media for Learning, Vol 1 No 1 (2020): 2019 SocMedHE Conference Edition
Social Media for Learning: Advancing Theoretical Frameworks to Understand Complex Learning Environments
Creators: name: Hartley, Alison
name: Farnsworth, Valerie
name: Bradbury, Helen
Publisher: name: The Journal of Social Media for Learning
Year: 2020

description: Students in higher education are driving the informal use of social media to support their cognitive and socio-emotional learning experiences during their undergraduate studies, with a growing literature base supporting the use of such technologies. This paper highlights a need to take a longitudinal approach to explore how students’ use of social media tools may change over time and promotes the use of social learning theories as a useful lens through which to explain this complex and situated learning of a given community of practice. It argues that to enhance social media pedagogies the research community needs to explore more explicitly ways that innovative pedagogy can inform theory development within the field, and equally how a greater maturity in understanding those theories can enhance our pedagogical practices. The potential for cultural historical activity theory (CHAT) as a framework for researching the multi-dimensional, or dialectical, interactions that may occur in the social media space is examined. CHAT is promoted as a useful theory for introducing a greater focus on the role of the social media tool itself in mediating learning. The paper concludes by proposing that that whilst existing social learning theories provide useful starting points for making sense of how social media can support learning, there may also be a need for the advancement of such theoretical frameworks to ensure that we develop theory capable of exploring the complexity of learning that could take place in social media spaces.
description: The Journal of Social Media for Learning, Vol 1 No 1 (2020): 2019 SocMedHE Conference Edition
Effect of the resonant ac-drive on the spin-dependent recombination of polaron pairs: Relation to organic magnetoresistance
Creators: name: Raikh, M. E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The origin of magnetoresistance is bipolar organic materials is the influence of magnetic field on the dynamics of recombination within localized electron-hole pairs. Recombination from the $S$ spin-state of the pair in preceded by the beatings between the states $S$ and $T_0$. Period of the beating is set by the the random hyperfine field. For the case when recombination time from $S$ is shorter than the period, we demonstrate that a {\em weak} resonant ac drive, which couples $T_0$ to $T_+$ and $T_{-}$ affects dramatically the recombination dynamics and, thus, the current A distinctive characteristics of the effect is that the current versus the drive amplitude exhibits a {\em maximum}.
description: 5 Pages, 2 figures
Emergence of the Kennicutt-Schmidt Relation from the Small-Scale SFR-Density Relation
Creators: name: Gnedin, Nickolay Y.
name: Tasker, Elizabeth J.
name: Fujimoto, Yusuke
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use simulations of isolated galaxies with a few parsec resolution to explore the connection between the small-scale star formation rate - gas density relation and the induced large-scale correlation between the star formation rate surface density and the surface density of the molecular gas (the Kennicutt-Schmidt relation). We find that, in the simulations, a power-law small-scale "star formation law" directly translates into an identical power-law Kennicutt-Schmidt relation. If this conclusion holds in the reality as well, it implies that the observed approximately linear Kennicutt-Schmidt relation must reflect the approximately linear small-scale "star formation law".
description: Replaced with the accepted version
Sonnenfleckenzeichnung Nr. 28126.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 25.02.1990, erstellt von Hans Ulrich Keller
Creators: name: Eidgenössische Sternwarte in Zürich (ETH Zürich bzw. vor 1911 Polytechnikum)
Publisher: name: [s.n.]
Year: 1990

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der ehem. Eidgenössischen Sternwarte Zürich. Instrument: Zeiss Coudé-Refraktor (150/2250 mm).
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Zusätzlich notiert: Tabelle mit den statistischen Angaben, für die Werte g, f und mit einer Spalte für A: von blossem Auge sichtbare Flecken, beobachtet mit Hilfe eines korrekt-reduzierenden optischen Filters (naked eye sunspots).
Beobachtungstätigkeit am erwähnten Ort im Auftrag des Schweizerischen Militärdepartements, Bundesamt für Übermittlungstruppen (BAUEM): Zählungen am Fraunhoferschen Normalrefraktor und Zeichnungen am Zeiss-Coudé-Refraktor
A Comparison of the Five Monochords of Guido of Arezzo
Creators: name: Brockett, Clyde W.
Publisher: name: Columbia University
Year: 1981
Subjects: Music

description: Arezzo closes his Epistola Michaeli Monacho ("Letter to Brother Michael"), advocating recourse to the already-published doctrines of Enchiridion by Abbotado (which probably refers to the French theory cycle Musica enchiriadis), and Boethius' treatise.' Guido, in addition to commending his own earlier works, claims that his Epistola, his last work, is essentially a simplification of ideas already in circulation. On the contrary, it includes a remarkable innovation: solmization interpreted through ut, re, mi, fa, sol, lao When Oliver Strunk translated Guido's procedure, he brought to a wide readership the origin and language of a paradigm for singing, "do-remi," which has become both facile and ubiquitous. However, Strunk did not translate all of Guido's Epistola; he left out the portion on the monochord, " which represents another way of facilitating singing. It is not surprising that Guido's monochords have made little impression upon scholars and have engendered little separate comment. Perhaps one cannot fully appreciate the intentions of such a renowned theorist as Guido until having dissected and compared the anatomies of the monochords, as we have essayed. Nor can one, I believe, reconstruct these tabletop instruments, either on paper or sounding, without a deep satisfaction, which Guido, or for that matter, Euclid, long before him, must also have felt at the rediscovery of the laws of Nature. One cannot thereby help but be astounded at the simultaneous complexity and simplicity of these laws.
A Student approach to using Educational Memes as an outlet to enhance learning.
Creators: name: Worswick Irving-Bell, Jennifer Louise
Publisher: name: The Journal of Social Media for Learning
Year: 2020

description: Memes are visual images, or video clips, often humorous in nature that can be easily (and rapidly) shared via social media. Having defined memes and their potential within the context of learning environments, this submission is developed from a ‘snap shot’ presentation at the Social Media for learning in Higher education Conference (2019) at Edge Hill University. The work presents a reflective account of the lived experiences of an ex-sixth form (now a first year undergraduate) student on the educational use of ‘memes’ to engage learners and enhance learning.
description: The Journal of Social Media for Learning, Vol 1 No 1 (2020): 2019 SocMedHE Conference Edition
Spectroscopy of blue horizontal branch stars in NGC 6656 (M22)
Creators: name: Salgado, C.
name: Bidin, C. Moni
name: Villanova, S.
name: Geisler, D.
name: Catelan, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Recent investigations revealed very peculiar properties of blue horizontal branch (HB) stars in ωCentauri, which show anomalously low surface gravity and mass compared to other clusters and to theoretical models. ωCentauri, however, is a very unusual object, hosting a complex mix of multiple stellar populations with different metallicity and chemical abundances. We measured the fundamental parameters (temperature, gravity, and surface helium abundance) of a sample of 71 blue HB stars in M22, with the aim of clarifying if the peculiar results found in ωCen are unique to this cluster. M22 also hosts multiple sub-populations of stars with a spread in metallicity, analogous to ωCen. The stellar parameters were measured on low-resolution spectra fitting the Balmer and helium lines with a grid of synthetic spectra. From these parameters, the mass and reddening were estimated. Our results on the gravities and masses agree well with theoretical expectations, matching the previous measurements in three "normal" clusters. The anomalies found in ωCen are not observed among our stars. A mild mass underestimate is found for stars hotter than 14\,000 K, but an exact analogy with ωCen cannot be drawn. We measured the reddening in the direction of M22 with two independent methods, finding E(B-V)=0.35 \pm 0.02 mag, with semi-amplitude of the maximum variation Δ(E(B-V))=0.06 mag, and an rms intrinsic dispersion of σ(E(B-V))=0.03 mag.
description: 11 pages, 9 Postscript figures