cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Influence of Lorentz-violating terms on a two-level system
Creators: name: Ferreira, Manoel M.
name: Gomes, Adalto R.
name: Lopes, Rafael C. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The influence of Lorentz- and CPT-violating terms of the extended Standard Model on a semi-classical two-level system is analyzed. It is shown that the Lorentz-violating background (when coupled with the fermion sector in a vector way) is able to induce modifications on the Rabi oscillation pattern, promoting sensitive modulations on the usual oscillations. As for the term involving the coefficient coupled in an axial vector way, it brings about oscillations both on energy states and on the spin states (implied by the background). It is also seen that such backgrounds are able to yield state oscillations even in the absence of the electromagnetic field. The foreseen effects are used to establish upper bounds on the Lorentz-violating coefficients.
description: 13 pages, 6 figures, revtex styles
Photon–electron coincidence experiments at synchrotron radiation facilities with arbitrary bunch modes
Creators: name: Ozga, Christian
name: Honisch, Carolin
name: Schmidt, Philipp
name: Holzapfel, Xaver
name: Zindel, Christina
name: Küstner-Wetekam, Catmarna
name: Richter, Clemens
name: Hergenhahn, Uwe
name: Ehresmann, Arno
name: Knie, André
name: Hans, Andreas
Publisher: name: Universität Kassel
Year: 2021
Subjects: subject: coincidence counting
subject: data acquisition
subject: luminescence
subject: photoionization
subject: auger effect
subject: synchrotron radiation
subject: 530
subject: Datenerfassung
subject: Lumineszenz
subject: Fotoionisation
subject: Auger-Effekt
subject: Synchrotronstrahlung

description: Gefördert im Rahmen eines Open-Access-Transformationsvertrags mit dem Verlag
The AMIGA sample of isolated galaxies. VII. Far-infrared and radio continuum study of nuclear activity
Creators: name: Sabater, J.
name: Leon, S.
name: Verdes-Montenegro, L.
name: Lisenfeld, U.
name: Sulentic, J.
name: Verley, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a study of the nuclear activity in a well-defined sample of the most isolated galaxies in the local Universe traced by their far-infrared (FIR) and radio continuum emission. We use the well-known radio continuum-FIR correlation to select radio-excess galaxies that are candidates to host an active galactic nucleus (AGN), as well as the FIR colours to find obscured AGN candidates. The existing information on nuclear activity in the Véron-Cetty catalogue and in the NASA Extragalactic Database are also used. A final catalogue of AGN-candidate galaxies has been produced. It contains 89 AGN candidates and is publicly available on the AMIGA web page (http://www.iaa.csic.es/AMIGA.html). At most ~ 1.5 % of the galaxies shows a radio-excess with respect to the radio-FIR correlation, and this fraction even goes down to less than 0.8 % after rejection of back/foreground sources. We find that the fraction of FIR colour selected AGN-candidates is ~ 28 % with a lower limit of ~ 7 %. A comparison with the results from the literature shows that the AMIGA sample has the lowest ratio of AGN candidates, both globally and separated into early and late types. Field galaxies as well as poor cluster and group environments show intermediate values, while the highest rates of AGN candidates are found in the central parts of clusters and in pair/merger dominated samples. We conclude that the environment plays a crucial and direct role in triggering radio nuclear activity and not only via the density-morphology relation. Isolated, early-type galaxies show a particularly low level of activity at radio wavelengths hence constituting the most nurture-free population of luminous early-type galaxies.
description: 12 pages, 5 figures, accepted for publication in A&A. v2: language corrections
Dynamical stability of K-essence field interacting non-minimally with a perfect fluid
Creators: name: Chatterjee, Anirban
name: Hussain, Saddam
name: Bhattacharya, Kaushik
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study models of non-minimally coupled relativistic fluid and $k$-essence scalar field in the background of a flat Friedmann-Lemaitre-Robertson-Walker universe. The non-minimal coupling term is introduced in the Lagrangian level. We employ the variational approach with respect to independent variables that produce modified $k-$essence field equations and the Friedmann equations. We have analyzed the coupled field-fluid framework explicitly using the dynamical system technique considering two different models based on inverse power-law potential. After examining these models it is seen that both models are capable of producing accelerating attractor solutions satisfying adiabatic sound speed conditions.
description: Some figures are modified and some text changed. Has 27 pages, 10 figures. This version has been accepted for publication in Physical Review D
Estimation of Quasi-Rational DSGE Models
Creators: name: Angelini, Giovanni <1986>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: SECS-P/05 Econometria

description: Small-scale dynamic stochastic general equilibrium have been treated as the benchmark of much of the monetary policy literature, given their ability to explain the impact of monetary policy on output, inflation and financial markets. One cause of the empirical failure of New Keynesian models is partially due to the Rational Expectations (RE) paradigm, which entails a tight structure on the dynamics of the system. Under this hypothesis, the agents are assumed to know the data genereting process. In this paper, we propose the econometric analysis of New Keynesian DSGE models under an alternative expectations generating paradigm, which can be regarded as an intermediate position between rational expectations and learning, nameley an adapted version of the "Quasi-Rational" Expectatations (QRE) hypothesis. Given the agents' statistical model, we build a pseudo-structural form from the baseline system of Euler equations, imposing that the length of the reduced form is the same as in the `best' statistical model.
Flavour mixing transport theory and resonant leptogenesis
Creators: name: Jukkala, Henri
name: Kainulainen, Kimmo
name: Rahkila, Pyry M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive non-equilibrium quantum transport equations for flavour-mixing fermions. We develop the formalism mostly in the context of resonant leptogenesis with two mixing Majorana fermions and one lepton flavour, but our master equations are valid more generally in homogeneous and isotropic systems. We give a hierarchy of quantum kinetic equations, valid at different approximations, that can accommodate helicity and arbitrary mass differences. In the mass-degenerate limit the equations take the familiar form of density matrix equations. We also derive the semiclassical Boltzmann limit of our equations, including the CP-violating source, whose regulator corresponds to the flavour coherence damping rate. Boltzmann equations are accurate and insensitive to the particular form of the regulator in the weakly resonant case $Δm \gg Γ$, but for $Δm \lesssim Γ$ they are qualitatively correct at best, and their accuracy crucially depends on the form of the CP-violating source.
description: 68 pages, 12 figures; (v2) updated to match published version. Code package available at https://doi.org/10.5281/zenodo.5025929
Additional file 1 of A non-invasive nanoparticles for multimodal imaging of ischemic myocardium in rats
Creators: name: Chen, Xiajing
name: Zhang, Yanan
name: Zhang, Hui
name: Zhang, Liang
name: Liu, Lingjuan
name: Cao, Yang
name: Ran, Haitao
name: Tian, Jie
Publisher: name: figshare
Year: 2021
Subjects: Space Science
Medicine
Chemical Sciences not elsewhere classified
Information Systems not elsewhere classified
Mathematical Sciences not elsewhere classified

description: Additional file 1: Figure S1. The size changes of IMTP-Fe3O4-PFH NPs for different days. Figure S2. The iron standard curves by atomic absorption spectroscopy. Figure S3. The routine blood indexes in the control group and the experimental groups. Figure S4. Morphology of normal H9C2 cells and cells treated with hypoxia for 24 h and 5 µmol/l of H2O2. Figure S5. Cell viability of H9C2 cells after treated with hypoxia for different duration and co-incubation with different concentrations of H2O2. Figure S6. Intra-operation and post-operation verification of ischemic myocardial model in rats. Figure S7. ADV and US imaging of IMTP-Fe3O4 NPs at different intensities of LIFU irritation and different time in vitro. Figure S8. The PA signal changes of IMTP-Fe3O4-PFH NPs irradiated by a laser at full spectrum ranging from 680 to 950 nm.
Gustav Adolf Lehmann – Rainer Wiegels (Hgg.), „Über die Alpen und über den Rhein …“. Beiträge zu den Anfängen und zum Verlauf der römischen Expansion nach Mitteleuropa
Creators: name: Schipp, Oliver
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Gustav Adolf Lehmann – Rainer Wiegels (Hgg.), „Über die Alpen und über den Rhein …“. Beiträge zu den Anfängen und zum Verlauf der römischen Expansion nach Mitteleuropa. Abhandlungen der Akademie der Wissenschaften zu Göttingen, Neue Folge Bd. 37. Berlin/Boston: De Gruyter 2015, 430 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft
Inflation connected to the origin of $CP$ violation
Creators: name: Hashimoto, Tsuyoshi
name: Risdianto, Norma Sidik
name: Suematsu, Daijiro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider a simple extension of the standard model, which could give a solution for its $CP$ issues such as the origin of both CKM and PMNS phases and the strong $CP$ problem. The model is extended with singlet scalars which could cause spontaneous $CP$ violation to result in these phases at low energy regions. The singlet scalars could give a good inflaton candidate if they have a suitable nonminimal coupling with the Ricci scalar. $CP$ issues and inflation could be closely related through these singlet scalars in a natural way. In a case where inflaton is a mixture of the singlet scalars, we study reheating and leptogenesis as notable phenomena affected by the fields introduced in this extension.
description: 41 pages, 6 figures, several clarifications, one figure and references are added, a version accepted for publication
Trust
Creators: name: Söllner, Matthias
name: Benbasat, Izak
name: Gefen, David
name: Leimeister, Jan Marco
name: Pavlou, Paul A.
Publisher: name: Universität Kassel
Year: 2016
Subjects: subject: 004
subject: Vertrauen
subject: Informationstechnik
subject: Akzeptanz
subject: Technischer Fortschritt

description: MIS Quarterly Research Curations are edited by Ashley Bush and Arun Rai.
Michael Featherstone – Jean-Michel Spieser – Gülru Tanman – Ulrike Wulf-Rheidt (Hgg.), The Emperor’s House. Palaces from Augustus to the Age of Absolutism
Creators: name: Rollinger, Christian
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Michael Featherstone – Jean-Michel Spieser – Gülru Tanman – Ulrike Wulf-Rheidt (Hgg.), The Emperor’s House. Palaces from Augustus to the Age of Absolutism. Urban Spaces Bd. 4. Berlin/Boston: De Gruyter 2015, VIII + 424 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft
Effect of Blended Learning on Academic Achievement of Student Teachers in Bijnor
Creators: name: Joshi, Sunil Kumar
name: Khan, Nida
Publisher: name: Zenodo
Year: 2024

description: Scientific and technological advancements will be shifting the focus of the learning system from instructors to learners. Scientific advancements have significantly transformed the learning system by introducing innovative technologies and tools that enhance educational experiences. These developments not only make learning more interactive and engaging but also support individualized education tailored to each student's needs. Thus, the purpose of this study is to analyse the impact of blended learning on the academic performance of B.Ed. students. The researchers selected 200 students studying in six different B.Ed. colleges of Bijnor using purposive sampling. According to the study's findings, blended learning is preferred since there are notable distinctions between the instructional approaches in terms of achievement test scores. This suggests that students who experienced blended learning performed better on the achievement test compared to those who did not. Blended learning is a teaching strategy that merges conventional classroom instruction with online learning elements. Usually, it combines online exercises like interactive modules, multimedia presentations, and virtual discussions with traditional classroom Instructions. The combination of these methods allows for flexibility, personalized learning experiences, and increased student engagement. The findings suggest that implementing blended learning in B.Ed. programs can positively impact students' achievement. It may be beneficial for educators and institutions to consider incorporating blended learning approaches into their teaching practices to enhance student outcomes and foster positive attitudes towards learning.
Applying the Gibbs stability criterion to relativistic hydrodynamics
Creators: name: Gavassino, Lorenzo
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The stability of the equilibrium state is one of the crucial tests a hydrodynamic theory needs to pass. A widespread technique to study this property consists of searching for a Lyapunov function of the linearised theory, in the form of a quadratic energy-like functional. For relativistic fluids, the explicit expression of such a functional is often found by guessing and lacks a clear physical interpretation. We present a quick, rigorous and systematic technique for constructing the functional of a generic relativistic fluid theory, based on the maximum entropy principle. The method gives the expected result in those cases in which the functional was already known. For the method to be applicable, there must be an entropy current with non-negative four-divergence. This result is an important step towards a definitive resolution of the major open problems connected with relativistic dissipation.
description: Main article (7 pages, 1 figure) + Supplementary material (11 pages, 0 figures); published on Classical and Quantum Gravity Letters, see https://iopscience.iop.org/article/10.1088/1361-6382/ac2b0e
On the critical exponent in an isoperimetric inequality for chords
Creators: name: Exner, Pavel
name: Fraas, Martin
name: Harrell, Evans M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Commutative Algebra (math.AC)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The problem of maximizing the $L^p$ norms of chords connecting points on a closed curve separated by arclength $u$ arises in electrostatic and quantum--mechanical problems. It is known that among all closed curves of fixed length, the unique maximizing shape is the circle for $1 \le p \le 2$, but this is not the case for sufficiently large values of $p$. Here we determine the critical value $p_c(u)$ of $p$ above which the circle is not a local maximizer finding, in particular, that $p_c(\frac12 L)=\frac52$. This corrects a claim made in \cite{EHL}.
description: LaTeX, 12 pages, with 1 eps figure
Anomalous translational velocity of vortex ring with finite-amplitude Kelvin waves
Creators: name: Barenghi, C. F.
name: Hänninen, R.
name: Tsubota, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We consider finite-amplitude Kelvin waves on an inviscid vortex assuming that the vortex core has infinitesimal thickness. By numerically solving the governing Biot-Savart equation of motion, we study how the frequency of the Kelvin waves and the velocity of the perturbed ring depend on the Kelvin wave amplitude. In particular, we show that, if the amplitude of the Kelvin waves is sufficiently large, the perturbed vortex ring moves backwards.
description: 6 pages, 5 figures, v2: minor changes, v3: typos corrected
Philipp Niewöhner, Die byzantinischen Basiliken von Milet. Nach Vorarbeiten von Theodor Wiegand, Hubert Knackfuß, Karl Wulzinger, Wolfgang Müller-Wiener und Otto Feld
Creators: name: Westphalen, Stephan
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Philipp Niewöhner, Die byzantinischen Basiliken von Milet. Nach Vorarbeiten von Theodor Wiegand, Hubert Knackfuß, Karl Wulzinger, Wolfgang Müller-Wiener und Otto Feld. Mit Beiträgen von Johannes Becker, Ercan Erkul, Stefan Giese, Joachim Gorecki, Manfred Kunter, Heike Möller, Henriette Obermaier, Nadja Pöllath und Walter Prochaska. Milet, Bauwerke in Milet Bd. I,11, hg. von Volkmar von Graeve. Berlin/Boston: De Gruyter 2016, XVII + 411 S., 552 Abb., 21 Pläne (davon 6 Faltpläne), 3 Beilagen
description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft
Additional file 1 of Improving cause of death certification in the Philippines: implementation of an electronic verbal autopsy decision support tool (SmartVA auto-analyse) to aid physician diagnoses of out-of-facility deaths
Creators: name: Joshi, Rohina
name: Hazard, R. H.
name: Mahesh, Pasyodun Koralage Buddhika
name: Mikkelsen, L.
name: Avelino, F.
name: Sarmiento, Carmina
name: Segarra, A.
name: Timbang, T.
name: Sinson, F.
name: Diango, Patrick
name: Riley, I.
name: Chowdhury, H.
name: Asuncion, Irma L.
name: Khanom, G.
name: Lopez, Alan D.
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy

description: Additional file 1.
Quasi-static non-linear characteristics of double-reed instruments
Creators: name: Almeida, Andre
name: Vergez, Christophe
name: Caussé, René
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: This article proposes a characterisation of the double-reed in quasi-static regimes. The non-linear relation between the pressure drop $Δp$ in the double-reed and the volume flow crossing it $q$ is measured for slow variations of these variables. The volume flow is determined from the pressure drop in a diaphragm replacing the instrument's bore. Measurements are compared to other experimental results on reed instrument exciters and to physical models, revealing that clarinet, oboe and bassoon quasi-static behavior relies on similar working principles. Differences in the experimental results are interpreted in terms of pressure recovery due to the conical diffuser role of the downstream part of double-reed mouthpieces (the staple).
Periodontal Tissues After Level and Align Lower Anterior Teeth in Nonextraction Orthodontic Treatment
Creators: name: Theerasopon, Pornpat
Publisher: name: The Dental Association of Thailand
Year: 2019
Subjects: bony dehiscence
Curve of Spee
crowding
mandibular incisor
gingival recession

description: Journal of The Dental Association of Thailand, 69, 3, 260-270
Alexander Heinemann, Der Gott des Gelages. Dionysos, Satyrn und Mänaden auf attischem Trinkgeschirr des 5. Jahrhunderts v. Chr.
Creators: name: Räuchle, Viktoria
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Alexander Heinemann, Der Gott des Gelages. Dionysos, Satyrn und Mänaden auf attischem Trinkgeschirr des 5. Jahrhunderts v. Chr. Berlin/Boston: De Gruyter 2016, 787 S., 352 s/w-Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft
On Dirac-like Monopoles in a Lorentz- and CPT-violating Electrodynamics
Creators: name: Barraz, N. M.
name: Fonseca, J. M.
name: Moura-Melo, W. A.
name: Helayël-Neto, J. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study magnetic monopoles in a Lorentz- and CPT-odd electrodynamical framework in (3+1) dimensions. This is the standard Maxwell model extended by means of a Chern-Simons-like term, $b_μ\tilde{F}^{μν}A_ν$ ($b_μ$ constant), which respects gauge invariance but violates both Lorentz and CPT symmetries (as a consequence, duality is also lost). Our main interest concerns the analysis of the model in the presence of Dirac monopoles, so that the Bianchi identity no longer holds, which naively yields the non-conservation of electric charge. Since gauge symmetry is respected, the issue of charge conservation is more involved. Actually, the inconsistency may be circumvented, if we assume that the appearance of a monopole induces an extra electric current. The reduction of the model to (2+1) dimensions in the presence of both the magnetic sources and Lorentz-violating terms is presented. There, a quantization condition involving the scalar remnant of $b_μ$, say, the mass parameter, is obtained. We also point out that the breaking of duality may be associated with an asymmetry between electric and magnetic sources in this background, so that the electromagnetic force experienced by a magnetic pole is supplemented by an extra term proportional to $b_μ$, whenever compared to the one acting on an electric charge.
description: 10 pages, no figures, typed in tex
Hidden Killing Fields, Geometric Symmetries and Black Hole Mergers
Creators: name: Huber, Albert
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the present work, using the recently introduced framework of local geometric deformations, special types of vector fields - so-called hidden Killing vector fields - are constructed, which solve the Killing equation not globally, but only locally, i.e. in local subregions of spacetime. Taking advantage of the fact that the vector fields coincide locally with Killing fields and therefore allow the consideration of integral laws that convert into exact physical conservation laws on local scales, balance laws in dynamical systems without global Killing symmetries are derived that mimic as closely as possible the conservation laws for energy and angular momentum of highly symmetric models. The utility of said balance laws is demonstrated by a concrete geometric example, namely a toy model for the binary merger of two extremal Reissner-Nordström black holes.
description: 22 pages, 1 figure; section one extended, results unchanged; matches published version
Compelling moments of collaboration : a reading of the works by Fukazawa Shichiro
Creators: name: Kanada, Chizu
Publisher: name: University of British Columbia
Year: 2010

description: This thesis is a study of the narrative strategies in the fiction of Fukazawa Shichirō (1914-87) and the ways in which these strategies work to solicit involvement in a compelling reading experience. The role of the narrator in each of the stories I discuss proves to be critical in the establishment of this relationship. And while I examine the thematic implications further enhanced by this solicitation, I have chosen to focus on how each story through its narrator produces those thematic messages. My emphasis on each work's technical aspect is also a deliberate, compensatory move, a reaction against the tendency of Japanese critics who slight the process of reading as a determining factor in their evaluation of Fukazawa's works. Little effort has been made to account for the construction of each work, and thus credit is rarely given for an immediate or enjoyable experience while reading. Thus, I have explored the neglected aspect of Fukazawa's fiction which, I believe, is one of the most commendable of his writings' achievements. I have primarily dealt with one story per chapter, although I have frequent recourse to other works by Fukazawa and other writers, and have selected four stories which I believe best capture the essence of Fukazawa's narrative craftsmanship. Each story's center of consciousness--the third person narrators in the subjects of study of Chapters One and Two, respectively, "On the Melodies of Oak Mountain" and The Fuefuki River, and the first person narrator-protagonists of "A Dream Tale (Chapter Three) and "The Dolls of Michinoku" (Chapter Four)--asks its reader to participate in a complex and distinct negotiation. And yet, despite all the variety one expects and finds in works spanning a thirty year writing career, I will contend that in each of the four stories above certain strategies are consistently used to initiate reader involvement and thus invite us to co-produce those compelling moments that Fukazawa would have us enjoy.
lattice-symmetries: A package for working with quantum many-body bases
Creators: name: Westerhout, Tom
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Exact diagonalization (ED) is one of the most reliable and established numerical methods of quantum many-body theory. The main limiting factor of the method is the exponential scaling of Hilbert space dimension with system size. Fortunately, by symmetry considerations the effective dimension can be reduced by multiple orders of magnitude. Here, we present lattice-symmetries, a package for working with such symmetry-adapted quantum many-body bases and operators. It supports bases for spin-1/2 particles with arbitrary user-defined symmetries and generic 1-, 2-, 3-, and 4-point operators. As an example application we discuss SpinED program which allows to easily diagonalize clusters of at least 42 sites on a single node thus making large-scale ED easily accessible to people with no background in numerical methods and computational physics.
description: v2: submitted version, published in Journal of Open Source Software; extended discussion of similar software, added a note on architecture limitations, minor grammar corrections; v1: 4 pages, 1 figure
Diana Scarisbrick – Claudia Wagner – John Boardman, The Beverly Collection of Gems at Alnwick Castle
Creators: name: Gołyźniak, Paweł
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Diana Scarisbrick – Claudia Wagner – John Boardman, The Beverly Collection of Gems at Alnwick Castle. The Philip Wilson Gems and Jewellery Series Bd. 2. London/New York: Philip Wilson Publishers 2016, 320 S., 480 farb. Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft
Electron and phonon Cooling in a Superconductor - Normal Metal - Superconductor Tunnel Junction
Creators: name: Rajauria, Sukumar
name: Luo, P. S.
name: Fournier, T.
name: Hekking, F. W. J.
name: Courtois, H.
name: Pannetier, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present evidence for the cooling of normal metal phonons by electron tunneling in a Superconductor - Normal metal - Superconductor tunnel junction. The normal metal electron temperature is extracted by comparing the device current-voltage characteristics to the theoretical prediction. We use a quantitative model for the phonon cooling that includes the electron-phonon coupling in the normal metal and the Kapitza resistance between the substrate and the metal. It gives an excellent fit to the data and enables us to extract an effective phonon temperature in the normal metal.
description: 4 pages, 5 figures
Ein Brief (1918) Eduard Fraenkels (1888-1970) an Walther Kranz (1884-1960) über Tycho von Wilamowitz’ (1885-1914) Sophoklesbuch
Creators: name: Dräger, Paul
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft
Tibull. 1,1,48: tracce di 'deperditi' in semionciale?
Creators: name: Portuese, Orazio
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft
Spectroscopic evidence for a new type of surface resonance at noble metal surfaces
Creators: name: Eul, Tobias
name: Braun, Jürgen
name: Stadtmüller, Benjamin
name: Ebert, Hubert
name: Aeschlimann, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate the surface- and bulk-like properties of the pristine (110)-surface of silver using threshold photoemission by excitation with light of 5.9 eV. Using a momentum microscope, we identified two distinct transitions along the $\overlineΓ\,\overline{\textrm{Y}}$-direction of the crystal. The first one is a so far unknown surface resonance for the (110) noble metal surface, exhibiting an exceptionally large bulk character, that has so far been elusive in surface sensitive experiments. The second one stems from the well known bulk-like Mahan cone oriented along the $ΓL$-direction inside the crystal but projected onto the (110)-surface cut. The existence of the new state is confirmed by photocurrent calculations and its character analyzed.
Plano Nacional de Educação: aspectos da política educacional e contexto histórico
Creators: name: Mota Júnior, Antônio de Macêdo
Publisher: name: figshare
Year: 2021
Subjects: subject: 130304 Educational Administration, Management and Leadership
subject: FOS: Educational sciences

description: Este artigo aborda o tema da política educacional brasileira, no que se refere à contextualização histórica da ideia de elaboração de um Plano Nacional de Educação (PNE). Por meio de uma abordagem exploratória e descritiva, utilizando-se da pesquisa documental e bibliográfica, este trabalho ainda caracteriza conceitos de políticas públicas e aborda aspectos normativos balizadores da política educacional do país. Os resultados demonstram que a ideia de construção de um PNE remonta da década de 1930, a partir do Manifesto dos Pioneiros da Educação Nacional. Além disso, o trabalho destaca a importância desse documento-referência da educação nacional, como um importante instrumento de efetivação da política educacional brasileira.
HI content in galaxies in loose groups
Creators: name: Sengupta, Chandreyee
name: Balasubramanyam, Ramesh
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Gas deficiency in cluster spirals is well known and ram-pressure stripping is considered the main gas removal mechanism. In some compact groups too gas deficiency is reported. However, gas deficiency in loose groups is not yet well established. Lower dispersion of the member velocities and the lower density of the intra-group medium in small loose groups favour tidal stripping as the main gas removal process in them. Recent releases of data from HI Parkes all sky survey (HIPASS) and catalogues of nearby loose groups with associated diffuse X-ray emission have allowed us to test this notion. In this paper, we address the following questions: (a) do galaxies in groups with diffuse X-ray emission statistically have lower gas content compared to the ones in groups without diffuse X-ray emission? (b) does HI deficiency vary with the X-ray luminosity of the loose group in a systematic way? We find that (a) galaxies in groups with diffuse X-ray emission, on average, are HI deficient, and have lost more gas compared to those in groups without X-ray emission; the later are found not to have significant HI deficiency; (b) no systematic dependence of the HI deficiency with X-ray luminosity is found. Ram pressure assisted tidal stripping and evaporation by thermal conduction are the two possible mechanisms to account for this excess gas loss.
description: 9 pages, 4 figures, accepted in MNRAS
Forschungen über die rechtlichen Grundlagen der römischen Außenbeziehungen während der Republik bis zum Beginn des Prinzipats
Creators: name: Zack, Andreas
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft
Methods for Jet Studies and Search for Conical Emission with Three-Particle Correlations
Creators: name: Pruneau, Claude
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present a method based on three-particle azimuthal correlation cumulants for the study of the interaction of jets with the medium produced in heavy ion collisions at RHIC and LHC usable whenever jets cannot be reconstructed on an event-by-event basis with conventional jet finding algorithms. The method yields a model independent correlation function which may be used to study jet structure or search for new phenomena such as conical emission.
description: Proceedings for Poster presented at Quark Matter 2006, 5 pages 3 figures
Radiative heat transfer in gallium arsenide lec crystal pullers
Creators: name: Bakeer, Muna
Publisher: name: University of British Columbia
Year: 2010

description: A numerical analysis of radiative heat transfer in a liquid encapsulant Czochralski gallium arsenide crystal puller is developed. The heat transfer and equivilent ambient temperature of each surface element are calculated using the Gebhart radiative model. The effective ambient temperature, to which each surface element is radiating, is found to vary indicating that assuming a constant ambient temperature for all surfaces (simplified radiative model) is incorrect. The importance of including the middle and top cylinders of the growth chamber in numerical analysis of radiative heat transfer in the system is evaluated in the study. The upper section could be replaced by one isothermal surface without significant change of the effective ambient temperature distribution. Fluid flow and heat transfer in the GaAs melt, crystal and encapsulant are calculated using a three dimensional axisymmetric finite difference code which includes the detailed radiative model. The mathematical modelling of the fluid and heat flow describes steady state transport phenomena in a three dimensional solution domain with latent heat release at the liquid/solid interface. The predicted flow and temperature fields using the detailed radiative model differ considerably from the predicted fields using the simplified model. The simplified model shows high axial and low radial temperature gradients in the crystal near the encapsulant region; the axial gradient decreases and the radial gradient increases with increasing distance from the encapsulant top. The detailed model shows a high radial temperature gradient in the crystal near the crystal-encapsulant-ambient junction and nearly flat isotherms in the top half of the crystal.
Statistical Description of a Magnetized Corona above a Turbulent Accretion Disk
Creators: name: Uzdensky, Dmitri
name: Goodman, Jeremy
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We present a physics-based statistical theory of a force-free magnetic field in the corona above a turbulent accretion disk. The field is represented by a statistical ensemble of loops tied to the disk. Each loop evolves under several physical processes: Keplerian shear, turbulent random walk of the disk footpoints, and reconnection with other loops. To build a statistical description, we introduce the distribution function of loops over their sizes and construct a kinetic equation that governs its evolution. This loop kinetic equation is formally analogous to Boltzmann's kinetic equation, with loop-loop reconnection described by a binary collision integral. A dimensionless parameter is introduced to scale the (unknown) overall rate of reconnection relative to Keplerian shear. After solving for the loop distribution function numerically, we calculate self-consistently the distribution of the mean magnetic pressure and dissipation rate with height, and the equilibrium shapes of loops of different sizes. We also compute the energy and torque associated with a given loop, as well as the total magnetic energy and torque in the corona. We explore the dependence of these quantities on the reconnection parameter and find that they can be greatly enhanced if reconnection between loops is suppressed.
description: 22 pages, 15 figures. Submitted to the Astrophysical Journal
Lees-Edwards boundary conditions for translation invariant shear flow: implementation and transport properties
Creators: name: Bindgen, Sebastian
name: Weik, Florian
name: Weeber, Rudolf
name: Koos, Erin
name: de Buyl, Pierre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Molecular dynamics (MD) simulations represent a powerful investigation tool in the field of soft matter. By using shear flows, one can probe the bulk rheology of complex fluids, also beyond the linear response regime, in a way that imitates laboratory experiments. One solution to impose a shear flow in particle-based simulations is the Lees-Edwards technique which ensures that particles experience shear by imposing rules for motion and interactions across the boundary in the direction of the shear plane. Despite their presentation in 1972, a readily available public implementation of Lees-Edwards boundary conditions has been missing from MD simulation codes. In this article, we present our implementation of the Lees-Edwards technique and discuss the relevant technical choices. We used ESPResSo, the extensible simulation package for research on soft matter, for molecular dynamics simulations which can be used as a reference for other implementers. We illustrate our implementation using bulk dissipative particle dynamics fluids, compare different viscosity measurement techniques, and observe the anomalous diffusion in our samples during continuous and oscillatory shear, in good comparison to theoretical estimates.
description: 32 pages, 8 figures
Magnetic vortex-like excitations on a sphere
Creators: name: Milagre, G. S.
name: Moura-Melo, Winder A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study magnetic vortex-like solutions lying on the spherical surface. The simplest cylindrically symmetric vortex presents two cores (instead of one, like in open surfaces) with same charge, so repealing each other. However, the net vorticity is computed to vanish in accordance with Gauss theorem. We also address the problem of a flat plane in which a conical, a pseudospherical and a hemispherical segments were incorporated. In this case, if we allow the vortex to move without appreciable deformation in this support, then it is attracted by the conical apex and by the pseudosphere as well, while it is repealed by the hemisphere. This suggests that such surfaces could be viewed as pinning and depinning geometries for those excitations. Spherical harmonics coreless solutions are discussed within some details.
description: 15 pages, 8 .eps figures, typed in tex. Version accepted in Physics Letters A (2007), please see DOI #
Simulation techniques for modified gravity
Creators: name: Llinares, Claudio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The standard paradigm of cosmology assumes General Relativity (GR) is a valid theory for gravity at scales in which it has not been properly tested. Developing novel tests of GR and its alternatives is crucial if we want to give strength to the model or find departures from GR in the data. Since alternatives to GR are usually defined through nonlinear equations, designing new tests for these theories implies a jump in complexity and thus, a need for refining the simulation techniques. We summarize existing techniques for dealing with modified gravity (MG) in the context of cosmological simulations. $N$-body codes for MG are usually based on standard gravity codes. We describe the required extensions, classifying the models not according to their original motivation, but by the numerical challenges that must be faced by numericists. MG models usually give rise to elliptic equations, for which multigrid techniques are well suited. Thus, we devote a large fraction of this review to describing this particular technique. Contrary to other reviews on multigrid methods, we focus on the specific techniques that are required to solve MG equations and describe useful tricks. Finally, we describe extensions for going beyond the static approximation and dealing with baryons.
description: 37 pages. Published as part of the IJMPD special issue "Modified Gravity: Progresses and Outlook of Theories, Numerical Techniques and Observational Tests" edited by Baojiu Li and Kazuya Koyama. Submitted to arXiv after end of embargo period
Inclusive production of heavy quarkonium $η_Q$ via $Z$ boson decays within the framework of nonrelativistic QCD
Creators: name: Zheng, Xu-Chang
name: Chang, Chao-Hsi
name: Wu, Xing-Gang
name: Huang, Xu-Dong
name: Wang, Guang-Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the paper, the inclusive production of heavy quarkonium $η_Q$ ($Q=b$ or $c$) via $Z$ boson decays within the framework of nonrelativistic QCD effective theory are studied. The contributions from the leading color-singlet and color-octet Fock states are considered. Total and differential decay widths for the inclusive decays $Z \to η_Q+X$ are presented. It is found that the decays $Z\to η_Q +X$ are dominated by the $^3S_1^{[8]}$ component, so the decays can be inversely adopted to determine the values of the long-distance matrix elements $\langle {\cal O}^{η_{c}}(^{3}S_{1}^{[8]})\rangle$ and $\langle {\cal O}^{η_{b}}(^{3}S_{1}^{[8]})\rangle$, respectively. Our numerical results show that at an $e^+e^-$ collider running at the $Z$ pole with a high luminosity around $10^{35}{\rm cm}^{-2}{\rm s}^{-1}$ (a super $Z$ factory), there are about $4.5\times 10^7$ $η_c$ meson events and $6.1\times 10^5$ $η_b$ meson events to be produced per operation year, and the inclusive decays may be used for clarifying some problems on the heavy quarkonium $η_Q$ and nonrelativistic QCD.
description: 13 pages, 11 figures
Characterizing phage propagation in Bacillus subtilis and Mycobacterium smegmatis bacteriophages
Creators: name: Choi, Ashley
name: Fangkun Li
name: Lyzenga, Benjamin
name: Velez, Miriam
name: Wu, Samuel
name: Ngo, Ryan
name: Freise, Amanda
Publisher: name: F1000 Research Limited
Year: 2019

description: The influx of antibiotic-resistant bacteria has prompted the discovery of alternative anti-bacterial treatments for the future of public health. Isolation and characterization of a wide variety of bacteriophages can facilitate the widespread implementation of phage therapy for various bacterial infection. Novel phages, Frankly and Phreeze were isolated from soil sample and purified through a series of plaque assays in the host Bacillus subtilis and Mycobacterium smegmatis, respectively. A temperature assay and a cation assay were performed to determine optimal lysis conditions and maximize phage propagation. Results demonstrated Frankly yielded larger plaque sizes at lower temperatures, such as 25 °C, and increased phage propagation in the presence of Ca2+. However, genomic DNA isolation ofPhage Frankly yielded a low concentration of nucleic acid leading to a failure in whole-genome sequencing of Frankly. Therefore, Phreeze was sequenced and its lytic cassette was annotated to determine its potential candidate in phage therapy. Comparison of Lysin A through phylogenetic trees and dot plots analysis revealed high synteny among different clusters of Mycobacteriophages, indicating conservation in lysis mechanism. Interestingly, comparative analysis of RuvC-like resolvase suggests it might confer toxicity in the host via DNA incision, but further experimentation is required to fully understand its function. Overall, these results suggested Frankly and Phreeze’s potential applicability for phage therapy. Conservation of Lysin A and putative contribution of RuvC-like resolvase in lysis among Mycobacteriophages could be utilized to target pathogenic strains for phage therapy.
‚Billigkeit‘ in Rechtstheorie und -praxis: klassisches Athen und späte römische Republik
Creators: name: Piepenbrink, Karen
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 20 (2017): Göttinger Forum für Altertumswissenschaft