cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Monolithic Radiation-Pressure Driven, Low Phase Noise Silicon Nitride Opto-Mechanical Oscillator
Creators: name: Tallur, Siddharth
name: Sridaran, Suresh
name: Bhave, Sunil A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Cavity opto-mechanics enabled radiation pressure (RP) driven oscillators shown in the past offer an all optical Radio Frequency (RF) source without the need for external electrical feedback. However these oscillators require external tapered fiber or prism coupling and non-standard fabrication processes. In this work, we present a CMOS compatible fabrication process to design high optical quality factor opto-mechanical resonators in silicon nitride. The ring resonators designed in this process demonstrate low phase noise RP driven oscillations. Using integrated grating couplers and waveguide to couple light to the micro-resonator eliminates 1/f^3 and other higher order phase noise slopes at close-to-carrier frequencies present in previous demonstrations. We present an RP driven OMO operating at 41.97MHz with a signal power of -11dBm and phase noise of -85dBc/Hz at 1kHz offset with only 1/f^2 noise down to 10Hz offset from carrier.
High-precision CTE measurement of hybrid C/SiC composite for cryogenic space telescopes
Creators: name: Enya, K.
name: Yamada, N.
name: Imai, T.
name: Tange, Y.
name: Kaneda, H.
name: Katayama, H.
name: Kotani, M.
name: Maruyama, K.
name: Naitoh, M.
name: Nakagawa, T.
name: Onaka, T.
name: Suganuma, M.
name: Ozaki, T.
name: Kume, M.
name: Krodel, M. R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: This paper presents highly precise measurements of thermal expansion of a "hybrid" carbon-fiber reinforced silicon carbide composite, HB-Cesic\textregistered - a trademark of ECM, in the temperature region of \sim310-10K. Whilst C/SiC composites have been considered to be promising for the mirrors and other structures of space-borne cryogenic telescopes, the anisotropic thermal expansion has been a potential disadvantage of this material. HB-Cesic\textregistered is a newly developed composite using a mixture of different types of chopped, short carbon-fiber, in which one of the important aims of the development was to reduce the anisotropy. The measurements indicate that the anisotropy was much reduced down to 4% as a result of hybridization. The thermal expansion data obtained are presented as functions of temperature using eighth-order polynomials separately for the horizontal (XY-) and vertical (Z-) directions of the fabrication process. The average CTEs and their dispersion (1σ) in the range 293-10K derived from the data for the XY- and Z-directions were 0.805$\pm$0.003\times10$^{-6}$ K$^{-1}$ and 0.837\pm0.001\times10$^{-6}$ K$^{-1}$, respectively. The absolute accuracy and the reproducibility of the present measurements are suggested to be better than 0.01\times10$^{-6}$ K$^{-1}$ and 0.001\times(10)^{-6} K^{-1}, respectively. The residual anisotropy of the thermal expansion was consistent with our previous speculation regarding carbon-fiber, in which the residual anisotropy tended to lie mainly in the horizontal plane.
description: Accepted by Cryogeincs. 12 pages, 3 figures, 1 tablle
Fractional dynamics from the ordinary Langevin equation
Creators: name: Stanislavsky, Aleksander
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider the usual Langevin equation depending on an internal time. This parameter is substituted by a first passage time of a self-similar Markov process. Then the Gaussian process is parent, and the hitting time process is directing. The probability to find the resulting process at the real time is defined by the integral relationship between the probability densities of the parent and directing processes. The corresponding master equation becomes the fractional Fokker-Planck equation. We show that the resulting process has non-Markovian properties, all its moments are finite, the fluctuation-dissipation relation and the H-theorem hold.
description: 6 pages, 2 figures
Interferometry As A Tool To Calibrate Evolutionary Tracks
Creators: name: Cusano, Felice
Publisher: name: Zenodo
Year: 2012
Subjects: interferometry
giant stars
pre-main sequence binary system
evolutionary tracks

description: Up to now, the only way to determine the masses of single stars at different ages was to use the evolutionary tracks. Depending on the authors the evolutionary tracks for stars of the same masses are different. It is therefore important to test which models better predict the observations. In this PhD-thesis I present methods to determine physical parameters of young and evolved stars, combining spectroscopy with optical interferometry. The first part of the thesis discuss PMS stars, while the second part giant stars. Combining optical interferometry with spectroscopy it is possible to measure the dynamical masses of stars in binary systems. In the case of PMS stars I performed a spectroscopic survey to search for young binaries. The result was the collection of a sample of 13 young spectroscopic binary (SB). For these, I determined the orbital parameters and in two cases the mass ratios. For HD113449 I obtained interferometric observations with AMBER@VLTI. Combing these data with the spectroscopy, I determined the masses of the components of HD113449. Comparing these mass values and the mass ratios of the two SBs with different set of evolutionary tracks, I found that the Baraffe et al. (1998) tracks fit the observations best. In the case of the test of evolutionary tracks of giant stars, I measured the diameters of 30 giant stars using AMBER@VLTI and the CHARA array. A test was done comparing the diameters estimated from different set of evolutionary tracks with the interferometrically measured ones. This test showed that the Salasnich et al. (2000) models are the ones best fitting the observations. In the case of HD170693, I also obtained time series observations with the high resolution spectrograph at the TLS Tautenburg, deriving the oscillation frequencies from the measured radial velocities. Combining these informations with the interferometric diameter, I obtained the mass of this giant, which is in good agreement with the one from the models.
title: Dokumentation des Holocaust
title: Die Quellenedition zur Verfolgung und Ermordung der europäischen Juden
titleType: Subtitle
Creators: name: Wildt, Michael
Publisher: name: Humboldt-Universität zu Berlin
Year: 2013
Subjects: subject: 900 Geschichte, Geografie und Hilfswissenschaften

description: Dieser Beitrag ist mit Zustimmung des Rechteinhabers (De Gruyter) frei zugänglich.
Impact of edge shape on the functionalities of graphene-based single-molecule electronics devices
Creators: name: Carrascal, D.
name: García-Suárez, V. M.
name: Ferrer, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present an ab-initio analysis of the impact of edge shape and graphene-molecule anchor coupling on the electronic and transport functionalities of graphene-based molecular electronics devices. We analyze how Fano-like resonances, spin filtering and negative differential resistance effects may or may not arise by modifying suitably the edge shapes and the terminating groups of simple organic molecules. We show that the spin filtering effect is a consequence of the magnetic behavior of zigzag-terminated edges, which is enhanced by furnishing these with a wedge shape. The negative differential resistance effect is originated by the presence of two degenerate electronic states localized at each of the atoms coupling the molecule to graphene which are strongly affected by a bias voltage. The effect could thus be tailored by a suitable choice of the molecule and contact atoms if edge shape could be controlled with atomic precision.
description: 11 pages, 20 figures
(PI,0) antiferromagnetic spin excitations in superconducting Rb0.82Fe1.68Se2
Creators: name: Wang, Miaoyin
name: Li, Chunhong
name: Abernathy, D. L.
name: Song, Yu
name: Carr, Scott V.
name: Lu, Xingye
name: Li, Shiliang
name: Hu, Jiangping
name: Xiang, Tao
name: Dai, Pengcheng
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We use inelastic neutron scattering to show that superconducting (SC) rubidium iron selenide Rb0.82Fe1.68Se2 exhibits antiferromagnetic (AF) spin excitations near the in-plane wave vector Q = (PI, 0) identical to that for iron arsenide superconductors. Moreover, we find that these excitations change from incommensurate to commensurate with increasing energy, and occur at the expense of spin waves associated with the coexisting sqrt(5)\timessqrt(5) block AF phase. Since angle resolved photoemission experiments reveal no evidence for hole-like Fermi surface at Gamma(0, 0), our results suggest that the Q = (PI, 0) excitations in SC Rb0.82Fe1.68Se2 come from localized moments and may have a similar origin as the hourglass-like spin excitations in copper oxide superconductors.
description: 6 pages, 4 figures
Probability distributions for quantum stress tensors in four dimensions
Creators: name: Fewster, Christopher J.
name: Ford, L. H.
name: Roman, Thomas A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We treat the probability distributions for quadratic quantum fields, averaged with a Lorentzian test function, in four-dimensional Minkowski vacuum. These distributions share some properties with previous results in two-dimensional spacetime. Specifically, there is a lower bound at a finite negative value, but no upper bound. Thus arbitrarily large positive energy density fluctuations are possible. We are not able to give closed form expressions for the probability distribution, but rather use calculations of a finite number of moments to estimate the lower bounds, the asymptotic forms for large positive argument, and possible fits to the intermediate region. The first 65 moments are used for these purposes. All of our results are subject to the caveat that these distributions are not uniquely determined by the moments. However, we also give bounds on the cumulative distribution function that are valid for any distribution fitting these moments.We apply the asymptotic form of the electromagnetic energy density distribution to estimate the nucleation rates of black holes and of Boltzmann brains.
description: 26 pages, 2 figures
Improving The Extragalactic Distance Scale Using Cepheids In M33
Creators: name: Scowcroft, Victoria
Publisher: name: Zenodo
Year: 2010
Subjects: Cepheids
M33
Cosmology
Distance Scale

description: Cepheids have been used as distance indicators for almost a century. Through their well defined period–luminosity relation, their distance can be found from their period of pulsation alone. However, in recent years, an important uncertainty has arisen in its calibration, namely the effect of metallicity on the period–luminosity relation.

It is important that we quantify this effect as Cepheids are used to tie down the base of the extragalactic distance scale. Without an accurate calibration for the nearest distances, the distances we measure for all other objects will be subject to systematic uncertainties. This thesis studies how the chemical composition of a Cepheid affects the zero-point of the period–luminosity relation, and quantifies the resulting change in measured distance modulus.

The first study uses Cepheids in two areas of M33; a sample from the metal–rich central region is compared with the more metal–poor sample from the southern spiral arm. Period–luminosity relations in the reddening–free Wesenheit index Wvi are constructed for the two samples and the measured distance moduli are compared. A significant offset is found between the two samples. Effects such as reddening and blending are ruled out, leaving the change in metallicity as the only possible explanation for the discrepancy.

The second study presented covers the whole of M33. Here, a sample of around 600 Cepheids is used, and the effect of metallicity on Wgi and Wri is measured. The same conclusion is found; the change in composition significantly affects the measured distance modulus of the Cepheid and the period–luminosity relation must be changed to take this into account.

In addition, the Sloan band period–luminosity relations are derived empirically for the first time.

The metallicity gradient of M33 is also assessed. It is found that the slope must be steep, at least in the central few kpc of the galaxy, but may flatten off at larger radial distances.
Pressure of thermal excitations in superfluid helium
Creators: name: Adamenko, I. N.
name: Nemchenko, K. E.
name: Tanatarov, I. V.
name: Wyatt, A. F. G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We find the pressure, due to the thermal excitations of superfluid helium, at the interface with a solid. The separate contributions of phonons, $R^-$ rotons and $R^+$ rotons are derived. The pressure due to $R^-$ rotons is shown to be negative and partially compensates the positive contribution of $R^+$ rotons, so the total roton pressure is positive but several times less than the separate $R^-$ and $R^+$ roton contributions. The pressure of the quasiparticle gas is shown to account for the fountain effect in $HeI I$. An experiment is proposed to observe the negative pressure due to $R^-$ rotons.
description: 14 pages, 4 figures
Molecular Gas In Early-Type Galaxies
Creators: name: Alatalo, Katherine
Publisher: name: Zenodo
Year: 2012

description: This thesis explores the relationship between molecular gas and early-type galaxies (ETGs). Specifically, I explore how molecular gas behaves and is con gured in a complete sample of morphologically selected elliptical and lenticular galaxies. I also highlight a case study where molecular gas is being expelled and its host is rapidly transitioning from starforming to quiescent.

I first present the Combined Array for Research for Millimeter Astronomy (CARMA) ATLAS3D CO imaging survey of 30 nearby CO-rich ETGs which, when combined with archival data, creates a catalog of 40 ETGs with available CO imaging within the context of the ATLAS3D survey. I examine the distribution of the morphologies of the molecular gas within these systems, and correlate them with other properties of the host galaxy, such as color and environment membership.

Following the molecular gas observations from both CARMA and the Submillimeter Array, I present molecular gas data for nearby eld galaxy NGC 1266, which hosts a massive molecular out ow that is being driven by a central AGN. I present the properties and energetics associated with the system, and hypothesize about the driving mechanism.  I compare the out ow in NGC 1266 to other known out owing molecular systems and argue why NGC 1266 is unique.

From photometric observations from the Hubble Space Telescope as well as radio continuum observations from the Very Long Baseline Array, I present evidence that NGC 1266 is in a special phase of evolution, likely in a key part of the transition from being a blue starforming galaxy to a quiescent, red sequence galaxy. I argue that NGC 1266 should be considered a poststarburst galaxy, and explain why it is essential that searches for such transition objects and NGC 1266 analogs.
Vorhaltung Von Forschungsinformationen Gemäß Des Standards “Kerndatensatz Forschung” - Nutzen Und Herausforderungen Für Hochschul – Und Forschungsbibliotheken
Creators: name: Riechert, Mathias
Publisher: name: Zenodo
Year: 2016
Subjects: reseach information systems
research information
libraries
research core dataset

description: Forschungsinformationen und Forschungsinformationssysteme gewinnen für Hochschul- und Forschungsbibliotheken an Bedeutung. Der Beitrag diskutiert Potenziale und Herausforderungen der Standardisierung von Forschungsinformationen und die Rolle von Bibliotheken bei der Vorhaltung von Forschungsinformationen.
Effect of temperature on resonant electron transport through stochastic conduction channels in superlattices
Creators: name: Selskii, A. O.
name: Koronovskii, A. A.
name: Hramov, A. E.
name: Moskalenko, O. I.
name: Alekseev, K. N.
name: Greenaway, M. T.
name: Fromhold, T. M.
name: Shorokhov, A. V.
name: Khvastunov, N. N.
name: Balanov, A. G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We show that resonant electron transport in semiconductor superlattices with an applied electric and tilted magnetic field can, surprisingly, become more pronounced as the lattice and conduction electron temperature increases from 4.2 K to room temperature and beyond. It has previously been demonstrated that at certain critical field parameters, the semiclassical trajectories of electrons in the lowest miniband of the superlattice change abruptly from fully localised to completely unbounded. The unbounded electron orbits propagate through intricate web patterns, known as stochastic webs, in phase space, which act as conduction channels for the electrons and produce a series of resonant peaks in the electron drift velocity versus electric field curves. Here, we show that increasing the lattice temperature strengthens these resonant peaks due to a subtle interplay between thermal population of the conduction channels and transport along them. This enhances both the electron drift velocity and the influence of the stochastic webs on the current-voltage characteristics, which we calculate by making self-consistent solutions of the coupled electron transport and Poisson equations throughout the superlattice. These solutions reveal that increasing the temperature also transforms the collective electron dynamics by changing both the threshold voltage required for the onset of self-sustained current oscillations, produced by propagating charge domains, and the oscillation frequency.
description: 8 figures, 12 pages
High-Field Fermi Surface Properties in the Low Carrier Heavy Fermion Compound URu2Si2
Creators: name: Aoki, Dai
name: Knebel, Georg
name: Sheikin, Ilya
name: Hassinger, Elena
name: Malone, Liam
name: Matsuda, Tatsuma D.
name: Flouquet, Jacques
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We performed the Shubnikov-de Haas (SdH) experiments of the low carrier heavy fermion compound URu2Si2 at high fields up to 34T and at low temperatures down to 30mK. All main SdH branches named alpha, beta and gamma were observed for all the measured field-directions (H // [001] -> [100], [100] -> [110] and [001] -> [110]), indicating that these are attributed to the closed Fermi surfaces with nearly spherical shapes. Anomalous split of branch alpha was detected for the field along the basal plane, and the split immediately disappears by tilting the field to [001] direction, implying a fingerprint of the hidden order state. High field experiments reveal the complicated field-dependence of the SdH frequencies and the cyclotron masses due to the Zeeman spin-splitting associated with the Fermi surface reconstruction in the hidden order state with small carrier numbers. A new SdH branch named omega with large cyclotron mass of 25m0 was detected at high fields above 23T close to the hidden order instabilities.
description: 6 pages, 7 figures, accepted for publication in J. Phys. Soc. Jpn
A high dynamic-range instrument for SPICA for coronagraphic observation of exoplanets and monitoring of transiting exoplanets
Creators: name: Enya, K.
name: Abe, L.
name: Takeuchi, S.
name: Kotani, T.
name: Yamamuro, T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: This paper, first, presents introductory reviews of the Space Infrared Telescope for Cosmology and Astrophysics (SPICA) mission and the SPICA Coronagraph Instrument (SCI). SPICA will realize a 3m class telescope cooled to 6K in orbit. The launch of SPICA is planned to take place in FY2018. The SPICA mission provides us with a unique opportunity to make high dynamic-range observations because of its large telescope aperture, high stability, and the capability for making infrared observations from deep space. The SCI is a high dynamic-range instrument proposed for SPICA. The primary objectives for the SCI are the direct coronagraphic detection and spectroscopy of Jovian exoplanets in the infrared region, while the monitoring of transiting planets is another important target owing to the non-coronagraphic mode of the SCI. Then, recent technical progress and ideas in conceptual studies are presented, which can potentially enhance the performance of the instrument: the designs of an integral 1-dimensional binary-shaped pupil mask coronagraph with general darkness constraints, a concentric ring mask considering the obscured pupil for surveying a wide field, and a spectral disperser for simultaneous wide wavelength coverage, and the first results of tests of the toughness of MEMS deformable mirrors for the rocket launch are introduced, together with a description of a passive wavefront correction mirror using no actuator.
description: 15 pages, 10 figures, 2 tables
Band Symmetries and Singularities in Twisted Multilayer Graphene
Creators: name: Mele, E. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electronic spectra of rotationally faulted graphene bilayers are calculated using a continuum formulation for small fault angles that identifies two distinct electronic states of the coupled system. The low energy spectra of one state features a Fermi velocity reduction which ultimately leads to pairwise annihilation and regeneration of its low energy Dirac nodes. The physics in the complementary state is controlled by pseudospin selection rules that prevent a Fermi velocity renormalization and produce second generation symmetry-protected Dirac singularities in the spectrum. These results are compared with previous theoretical analyses and with experimental data.
description: 5 pages, 3 figures
Zwischen Heidetränke und Heidengraben
Creators: name: Stähler, Carmen Maria
Publisher: name: Fundberichte Hessen Digital
Year: 2020

description: Die Hohe Mark bei Oberursel beschreibt grob das bewaldete Gebiet zwischen Wall-Graben-Anlage Heidengraben und den Bächen Maßenborn und Schellbach. Die Untersuchung archäologischer Maßnahmen seit den 1950er-Jahren bis 2004 außerhalb der Wallanlagen Altenhöfe und Goldgrube (Heidetränke) sowie des Heidengrabens bestätigen eine zeitgleiche Datierung der beiden Bodendenkmäler. Die Funde beweisen eine Lt C2/D1- bis LT D1-zeitliche Nutzung der Hohe Mark mit Siedlungs-, Bestattungs- und Handwerkstätigkeiten. Somit vergrößert sich die Fläche des Heidetränk-Oppidums auf circa 380 ha, das nun in eine Akropolis (Zentrum der Goldgrube), eine Oberstadt im Bereich der Podien am Hang und eine Unterstadt (Urseltal bis Heidengraben) gegliedert werden kann.
description: Fundberichte Hessen Digital, Bd. 1: Fundberichte Hessen Digital 2019/2020
Transmission and reflection of phonons and rotons at the superfluid helium-solid interface
Creators: name: Adamenko, I. N.
name: Nemchenko, K. E.
name: Tanatarov, I. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We solve the problem of the transmission and reflection of phonons and rotons at the interface between superfluid helium and a solid, for all angles of incidence and in both directions. A consistent solution of the problem is presented which allows us to rigorously describe the simultaneous creation of phonons, $R^-$, and $R^+$ rotons in helium by either a phonon from the solid or a helium quasiparticle incident on the interface. The interaction of all $HeII$ quasiparticles with the interface, and their transmission, reflection and conversion into each other, is described in a unified way. The angles of propagation and the probabilities of creating quasiparticles are obtained for all cases. Andreev reflection of helium phonons and rotons is predicted. The energy flows through the interface due to phonons, $R^-$, and $R^+$ rotons are derived. The small contribution of the $R^-$ rotons is due to the small probability of an $R^-$ roton being created by a phonon in the solid, and vice versa. This explains the failure to directly create beams of $R^-$ rotons prior to the experiments of Tucker and Wyatt in 1999. New experiments for creating $R^-$ rotons, by beams of high-energy phonons (h-phonons), are suggested.
description: 12 pages, 9 figures
Philippe de Mézières, Rhétorique et poétique. Édité par Joël Blanchard, avec la collaboration de Renate Blumenfeld-Kosinski et Antoine Calvet, Genève (Librairie Droz) 2018
Creators: name: Pörnbacher, Mechthild
Publisher: name: Francia-Recensio
Year: 2020

description: Philippe de Mézières, Rhétorique et poétique. Édité par Joël Blanchard, avec la collaboration de Renate Blumenfeld-Kosinski et Antoine Calvet, Genève (Librairie Droz) 2018, 325 p. (Cahiers d’Humanisme et Renaissance, 157), ISBN 978-2-600-05962-6, EUR 39,00.
description: Francia-Recensio, 2020/2
Elina Screen, Charles West (ed.), Writing the Early Medieval West. Studies in Honour of Rosamond McKitterick, Cambridge (Cambridge University Press) 2018
Creators: name: Gantner, Clemens
Publisher: name: Francia-Recensio
Year: 2020

description: Elina Screen, Charles West (ed.), Writing the Early Medieval West. Studies in Honour of Rosamond McKitterick, Cambridge (Cambridge University Press) 2018, XVI–316 p., 8 fig., 6 tab., ISBN 978-1-107-19839-5, EUR 75,00.
description: Francia-Recensio, 2020/2
Dominique Barthélemy, Isabelle Guyot-Bachy, Frédérique Lachaud, Jean-Marie Moeglin (dir.), Communitas regni. La »communauté de royaume« de la fin du Xe siècle au début du XIVe siècle (Angleterre, Écosse, France, Empire, Scandinavie), Paris (Sorbonne Université Presses) 2020
Creators: name: Bachrach, David S.
Publisher: name: Francia-Recensio
Year: 2020

description: Dominique Barthélemy, Isabelle Guyot-Bachy, Frédérique Lachaud, Jean-Marie Moeglin (dir.), Communitas regni. La »communauté de royaume« de la fin du Xe siècle au début du XIVe siècle (Angleterre, Écosse, France, Empire, Scandinavie), Paris (Sorbonne Université Presses) 2020, 352 p., 5 ill. (Cultures et civilisations médiévales, 72), ISBN 979-10-231-0631-8, EUR 34,00.
description: Francia-Recensio, 2020/3
Revealing the grain structure of graphene grown by chemical vapor deposition
Creators: name: Incze, Péter Nemes -
name: Yoo, Kwon Jae
name: Tapasztó, Levente
name: Dobrik, Gergely
name: Lábár, János
name: Horváth, Zsolt E.
name: Hwang, Chanyong
name: Biró, László Péter
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The physical processes occurring in the presence of disorder: point defects, grain boundaries, etc. may have detrimental effects on the electronic properties of graphene. Here we present an approach to reveal the grain structure of graphene by the selective oxidation of defects and subsequent atomic force microscopy analysis. This technique offers a quick and easy alternative to different electron microscopy and diffraction methods and may be used to give quick feedback on the quality of graphene samples grown by chemical vapor deposition.
Untersuchungen zur Baukonstruktion der Venusgrotte
Creators: name: Kayser, Christian
name: Barthel, Rainer
Publisher: name: ICOMOS – Hefte des Deutschen Nationalkomitees
Year: 2020

description: ICOMOS – Hefte des Deutschen Nationalkomitees, Bd. 70 (2019): ICOMOS – Hefte des Deutschen Nationalkomitees
Rekonstruktion künstlicher Felsen und moderne Bauvorschriften
Creators: name: Schmickl, Armin
name: Umminger, Elke
Publisher: name: ICOMOS – Hefte des Deutschen Nationalkomitees
Year: 2020

description: ICOMOS – Hefte des Deutschen Nationalkomitees, Bd. 70 (2019): ICOMOS – Hefte des Deutschen Nationalkomitees
Deterministic design of wavelength scale, ultra-high Q photonic crystal nanobeam cavities
Creators: name: Quan, Qimin
name: Loncar, Marko
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Photonic crystal nanobeam cavities are versatile platforms of interest for optical communications, optomechanics, optofluidics, cavity QED, etc. In a previous work \cite{quan10}, we proposed a deterministic method to achieve ultrahigh \emph{Q} cavities. This follow-up work provides systematic analysis and verifications of the deterministic design recipe and further extends the discussion to air-mode cavities. We demonstrate designs of dielectric-mode and air-mode cavities with $Q>10^9$, as well as cavities with both high-\emph{Q} ($>10^7$) and high on-resonance transmissions ($T>95%$).
Discerning history through archaeology: the Custer battle
Creators: name: Fox, Richard A.
Publisher: name: University of Calgary
Year: 1988
Subjects: subject: E 83.876 F69 1988
subject: Little Big Horn, Battle of the, 1876
subject: Dakota Indians - Wars
subject: Indians of North America - Wars

description: Bibliography: p. 409-419.
description: Archaeology is a valuable tool for studying historic battles. The nature of a battle can be deduced from material remains using archaeological methods and reasoning, and without recourse to non-archaeological evidences. The spatial application of firearm identification analyses allows identification of individual movements and positions on the battlefield. Traditional analytical methods provide supporting data. Methodological analyses are focused within the parameters of a tactical stability/disintegration model. The results allow recognition of the temporal, spatial and behavioral aspects of a battle. Results of archaeological analyses are indispensable in evaluating documentary sources, since historical accounts of a battle can be expected to be incomplete, confusing and contradictory. The Custer battle provides an example. The malleable documentary base has allowed many differing interpretations of the battle. Analyses of material remains suggests that the Custer battalion disintegrated, that disintegration developed in the initial stages of fighting, and that thereafter there was little resistance to the Indian attack. Analytical results find confirmation in documentary sources which are deeply embedded in a confusing historical record. Contradictory written sources are rejected. The historical-archaeological construction of the battle indicates the Custer battalion delayed prior to attacking. Fighting during the delay was low-key. Poor judgment in assessing the tactical situation while delaying resulted in disintegration. Historical constructions of the battle which portray hapless soldiers driven, while on the defensive, to Custer Ridge and overwhelmed, plus Indian accounts which leave this impression, may be rejected. In fact, the historical-archaeological construction indicates the Custer battalion prior to disintegration was on the offensive. This construction provides insights into the strategy utilized during earlier stages of fighting which occurred outside of the archaeological study area. Such insights are not available from either material or documentary sources alone. Results of the Custer battle studies demonstrate the utility of archaeology in battlefield studies. Methods and modeling developed here may be used in historical analyses of other battles dating from the period of modern warfare. Results also demonstrate that the application of archaeology to the study of the past complements historical analyses. Both disciplines share common goals and are equal partners in historical studies. The process of amalgamating history and archaeology results in more complete and satisfying constructions of past reality.
The Error is the Message: Extracting Insights from Deceptive Data for Nazi-looted art
Creators: name: Zuckerman, Laurel
Publisher: name: Zenodo
Year: 2023
Subjects: Nazi-looted art
knowledge graph
disinformation tracking
digital art history
provenance research
Wikidata
business use case

description: Powerpoint presentation for the Knowledge Graph Conference 2023 The Error is the Message: Extracting Insights from Deceptive Data for Nazi looted art Turning dross into gold. Knowledge graphs, with their capacity for surfacing vast hidden networks, can help detect looted art from the ownership history – or provenance – of artworks. The cultural heritage sector and art industry have explored named entity recognition with an event-based approach using CIDOC-CRM. However, Nazi-looted art poses a particular challenge, in part due to the passage of time, and in part due to unreliable data, as attempts to conceal and distort information which began in the Nazi era continue into the digital age. Missing, confusing or badly coded entities, false dates, names, events, places, the mixing of speculation and fact occur with such frequency in Nazi-looted art that it is useful to view errors, not as anomalies to be cleansed from the dataset, but as primary features to be analyzed. This presentation focuses on strategies and methods to quantify, classify, code and exploit this unreliable information in order to detect looted art and the patterns and networks which underly its commercialisation.
The Energy gap: women, seasonal work and water in the upper region of Ghana
Creators: name: Francisco, Jim
Publisher: name: Environmental Design
Year: 1988
Subjects: subject: HD 6218.3 F73 1988
subject: Women - Employment - Ghana
subject: Subsistence economy - Ghana
subject: Ghana - Economic conditions
subject: Agriculture - Economic aspects - Ghana

description: Bibliography: p. 179-196.
Sesiunea internațională de la Berlin din decembrie 1990, ocazionată de implinirea a 100 de ani de la moartea lui Heinrich Schliemannț
Creators: name: Petrescu-Dîmbovița, Mircea
Publisher: name: Arheologia Moldovei
Year: 2020

description: Session de Berlin (1990) dédiée à Heinrich Schliemann
description: Arheologia Moldovei, Bd. 15 (1992): Arheologia Moldovei
The Error is the Message: Extracting Insights from Deceptive Data for Nazi-looted art
Creators: name: Zuckerman, Laurel
Publisher: name: Zenodo
Year: 2023
Subjects: Nazi-looted art
knowledge graph
disinformation tracking
digital art history
provenance research
Wikidata
business use case

description: Powerpoint presentation (draft) for the Knowledge Graph Conference 2023 The Error is the Message: Extracting Insights from Deceptive Data for Nazi looted art Turning dross into gold. Knowledge graphs, with their capacity for surfacing vast hidden networks, can help detect looted art from the ownership history – or provenance – of artworks. The cultural heritage sector and art industry have explored named entity recognition with an event-based approach using CIDOC-CRM. However, Nazi-looted art poses a particular challenge, in part due to the passage of time, and in part due to unreliable data, as attempts to conceal and distort information which began in the Nazi era continue into the digital age. Missing, confusing or badly coded entities, false dates, names, events, places, the mixing of speculation and fact occur with such frequency in Nazi-looted art that it is useful to view errors, not as anomalies to be cleansed from the dataset, but as primary features to be analyzed. This presentation focuses on strategies and methods to quantify, classify, code and exploit this unreliable information in order to detect looted art and the patterns and networks which underly its commercialisation.
Rheinische Grabsteine der Merowingerzeit
Creators: name: Egger, Rudolf
Publisher: name: Bonner Jahrbücher
Year: 2020

description: Bonner Jahrbücher, Bd. 154 (1954): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
The Radio - X-ray relation as a star formation indicator: Results from the VLA--E-CDFS Survey
Creators: name: Vattakunnel, S.
name: Tozzi, P.
name: Matteucci, F.
name: Padovani, P.
name: Miller, N.
name: Bonzini, M.
name: Mainieri, V.
name: Paolillo, M.
name: Vincoletto, L.
name: Brandt, W. N.
name: Luo, B.
name: Kellermann, K. I.
name: Xue, Y. Q.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In order to trace the instantaneous star formation rate at high redshift, and hence help understanding the relation between the different emission mechanisms related to star formation, we combine the recent 4 Ms Chandra X-ray data and the deep VLA radio data in the Extended Chandra Deep Field South region. We find 268 sources detected both in the X-ray and radio band. The availability of redshifts for $\sim 95$ of the sources in our sample allows us to derive reliable luminosity estimates and the intrinsic properties from X-ray analysis for the majority of the objects. With the aim of selecting sources powered by star formation in both bands, we adopt classification criteria based on X-ray and radio data, exploiting the X-ray spectral features and time variability, taking advantage of observations scattered across more than ten years. We identify 43 objects consistent with being powered by star formation. We also add another 111 and 70 star forming candidates detected only in the radio or X-ray band, respectively. We find a clear linear correlation between radio and X-ray luminosity in star forming galaxies over three orders of magnitude and up to $z \sim 1.5$. We also measure a significant scatter of the order of 0.4 dex, higher than that observed at low redshift, implying an intrinsic scatter component. The correlation is consistent with that measured locally, and no evolution with redshift is observed. Using a locally calibrated relation between the SFR and the radio luminosity, we investigate the L_X(2-10keV)-SFR relation at high redshift. The comparison of the star formation rate measured in our sample with some theoretical models for the Milky Way and M31, two typical spiral galaxies, indicates that, with current data, we can trace typical spirals only at z<0.2, and strong starburst galaxies with star-formation rates as high as $\sim 100 M_\odot yr^{-1}$, up to $z\sim 1.5$.
description: 21 pages, 10 figures, 5 tables
Measurements of Quasiparticle Tunneling Dynamics in a Bandgap-Engineered Transmon Qubit
Creators: name: Sun, L.
name: DiCarlo, L.
name: Reed, M. D.
name: Catelani, G.
name: Bishop, Lev S.
name: Schuster, D. I.
name: Johnson, B. R.
name: Yang, Ge A.
name: Frunzio, L.
name: Glazman, L. I.
name: Devoret, M. H.
name: Schoelkopf, R. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We have engineered the bandgap profile of transmon qubits by combining oxygen-doped Al for tunnel junction electrodes and clean Al as quasiparticle traps to investigate energy relaxation due to quasiparticle tunneling. The relaxation time $T_1$ of the qubits is shown to be insensitive to this bandgap engineering. Operating at relatively low $E_J/E_C$ makes the transmon transition frequency distinctly dependent on the charge parity, allowing us to detect the quasiparticles tunneling across the qubit junction. Quasiparticle kinetics have been studied by monitoring the frequency switching due to even/odd parity change in real time. It shows the switching time is faster than 10 $μ$s, indicating quasiparticle-induced relaxation has to be reduced to achieve $T_1$ much longer than 100 $μ$s.
description: 11 pages, 8 figures
On number fields with nontrivial subfields
Creators: name: Widmer, Martin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11R04 (Primary) 11G50, 11G35 (Secondary)

description: What is the probability for a number field of composite degree $d$ to have a nontrivial subfield? As the reader might expect the answer heavily depends on the interpretation of probability. We show that if the fields are enumerated by the smallest height of their generators the probability is zero, at least if $d>6$. This is in contrast to what one expects when the fields are enumerated by the discriminant. The main result of this article is an estimate for the number of algebraic numbers of degree $d=e n$ and bounded height which generate a field that contains an unspecified subfield of degree $e$. If $n>\max\{e^2+e,10\}$ we get the correct asymptotics as the height tends to infinity.
Research in plains taphonomy: the manipulation of faunal assemblages by scavengers
Creators: name: Garvin, Richard D. (Richard Douglas), 1957-
Publisher: name: University of Calgary
Year: 1987
Subjects: subject: GN 58 C3 G37 1987
subject: Anthropometry - Research - Canada
subject: Scavengers (Zoology)

description: Bibliography: p. 149-165.
Effective Field Theory and the Gamow Shell Model: The 6He Halo Nucleus
Creators: name: Rotureau, J.
name: van Kolck, U.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We combine Halo/Cluster Effective Field Theory (H/CEFT) and the Gamow Shell Model (GSM) to describe the $0^+$ ground state of $\rm{^6He}$ as a three-body halo system. We use two-body interactions for the neutron-alpha particle and two-neutron pairs obtained from H/CEFT at leading order, with parameters determined from scattering in the p$_{3/2}$ and s$_0$ channels, respectively. The three-body dynamics of the system is solved using the GSM formalism, where the continuum states are incorporated in the shell model valence space. We find that in the absence of three-body forces the system collapses, since the binding energy of the ground state diverges as cutoffs are increased. We show that addition at leading order of a three-body force with a single parameter is sufficient for proper renormalization and to fix the binding energy to its experimental value.
Asymmetric Magnetic Reconnection In The Solar Atmosphere
Creators: name: Murphy, Nicholas A.
name: Miralles, Mari Paz
name: Ranquist, Drake
name: Pope, Crystal
name: Raymond, John
name: Lukin, Vyacheslav
name: McKillop, Sean
name: Shen, Chengcai
name: Winter, Henry
name: Reeves, Katharine
name: Lin, Jun
Publisher: name: Zenodo
Year: 2013
Subjects: magnetic reconnection
solar flares
coronal mass ejections

description: Models of solar flares and coronal mass ejections typically predict the development of an elongated current sheet in the wake behind the rising flux rope. In reality, reconnection in these current sheets will be asymmetric along the inflow, outflow, and out-of-plane directions. We perform resistive MHD simulations to investigate the consequences of asymmetry during solar reconnection. We predict several observational signatures of asymmetric reconnection, including flare loops with a skewed candle flame shape, slow drifting of the current sheet into the strong field upstream region, asymmetric footpoint speeds and hard X-ray emission, and rolling motions within the erupting flux rope. There is net plasma flow across the magnetic field null along both the inflow and outflow directions. We compare simulations to SDO/AIA, Hinode/XRT, and STEREO observations of flare loop shapes, current sheet drifting, and rolling motions during prominence eruptions. Simulations of the plasmoid instability with different upstream magnetic fields show that the reconnection rate remains enhanced even during the asymmetric case. The islands preferentially grow into the weak field upstream region. The islands develop net vorticity because the outflow jets impact them obliquely rather than directly. Asymmetric reconnection in the chromosphere occurs when emerging flux interacts with pre-existing overlying flux. We present initial results on asymmetric reconnection in partially ionized chromospheric plasmas. Finally, we discuss how comparisons to observations are necessary to understand the role of three-dimensional effects.
A Straight-Forward Assessment and Analysis of Networking Infrastructures and Fundamental Services
Creators: name: Iqbal, Farhan Nadim
Publisher: name: Zenodo
Year: 2023
Subjects: Information Technology
Network Engineering
Networking Fundamentals
Network
Computer Science and Engineering
Computer Science
IT
Infrastructures
Firewalls
Software
Hardware
Engineering
Internet
Internet Protocols

description: The term networking infrastructures are used to define stacks of fundamental components involved in connecting digital devices to a network and allowing them to communicate with devices inside and outside the network (another network). For this paper, we can classify networking infrastructures into three fundamental categories: Hardware Networking Infrastructure, Software Infrastructure, and Fundamental Network Services.
Nature of the electronic states involved in the chemical bonding and superconductivity at high pressure in SnO
Creators: name: McLeod, J. A.
name: Lukoyanov, A. V.
name: Kurmaev, E. Z.
name: Finkelstein, L. D.
name: Moewes, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have investigated the electronic structure and the Fermi surface of SnO using density functional theory (DFT) calculations within recently proposed exchange-correlation potential (PBE+mBJ) at ambient conditions and high pressures up to 19.3 GPa where superconductivity was observed. It was found that the Sn valence states 5s, 5p, and 5d are strongly hybridized with the O 2p-states, and that our DFT-calculations are in good agreement with O K-edge X-ray spectroscopy measurements for both occupied and empty states. It was demonstrated that the metallic states appearing under pressure in the semiconducting gap stem due to the transformation of the weakly hybridized O 2p-Sn 5sp subband corresponding to the lowest valence state of Sn in SnO. We discuss the nature of the electronic states involved in chemical bonding and formation of the hole and electron pockets with nesting as a possible way to superconductivity.
description: 5 pages, 6 figures