cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Imaging evidence for solar wind outflows originating from a CME footpoint
Creators: name: Lörinčík, Juraj
name: Dudík, Jaroslav
name: Aulanier, Guillaume
name: Schmieder, Brigitte
name: Golub, Leon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report on the Atmospheric Imaging Assembly (AIA) observations of plasma outflows originating in a coronal dimming during the 2015 April 28th filament eruption. After the filament started to erupt, two flare ribbons formed, one of which had a well-visible hook enclosing a core (twin) dimming region. Along multiple funnels located in this dimming, a motion of plasma directed outwards started to be visible in the 171 and 193 filter channels of the instrument. In time-distance diagrams, this motion generated a strip-like pattern, which lasted for more than five hours and which characteristics did not change along the funnel. We therefore suggest the motion to be a signature of outflows corresponding to velocities ranging between $\approx70$ and 140 km s$^{-1}$. Interestingly, the pattern of the outflows as well as their velocities were found to be similar to those we observed in a neighboring ordinary coronal hole. Therefore, the outflows were most likely a signature of a CME-induced slow solar wind flowing along the open-field structures rooted in the dimming region. Further, the evolution of the hook encircling the dimming region was examined in the context of the latest predictions imposed for the three-dimensional magnetic reconnection. The observations indicate that the filament's footpoints were, during their transformation to the dimming region, reconnecting with surrounding canopies. To our knowledge, our observations present the first imaging evidence for outflows of plasma from a dimming region.
Properties and dynamics of meron topological spin textures in the two-dimensional magnet CrCl3
Creators: name: Augustin, Mathias
name: Jenkins, Sarah
name: Evans, Richard F. L.
name: Novoselov, Kostya S.
name: Santos, Elton J. G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Merons are nontrivial topological spin textures highly relevant for many phenomena in solid state physics. Despite their importance, direct observation of such vortex quasiparticles is scarce and has been limited to a few complex materials. Here we show the emergence of merons and antimerons in recently discovered two-dimensional (2D) CrCl3 at zero magnetic field. We show their entire evolution from pair creation, their diffusion over metastable domain walls, and collision leading to large magnetic monodomains. Both quasiparticles are stabilized spontaneously during cooling at regions where in-plane magnetic frustration takes place. Their dynamics is determined by the interplay between the strong in-plane dipolar interactions and the weak out-of-plane magnetic anisotropy stabilising a vortex core within a radius of 8-10 nm. Our results push the boundary to what is currently known about non-trivial spin structures in 2D magnets and open exciting opportunities to control magnetic domains via topological quasiparticles.
description: Nature Communications 12, 185 (2021). Editors' Highlights section
Photometric and Spectroscopic Study of Flares on Ross 15
Creators: name: Bai, Jian-Ying
name: Esamdin, Ali
name: Gao, Xing
name: Yan, Yan
name: Ren, Juan-Juan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We conducted photometric and spectroscopic observations for Ross 15 in order to further study the flare properties of this less observed flare star. A total of 28 B-band flares are detected in 128 hours of photometric observations, leading to a total flare rate of 0.22(+-0.04) hour^-1, more accurate than that provided by previous work. We give the energy range of the B-band flare (10^29.5 - 10^31.5 erg) and the FFD for the star. Within the same energy range, the FFD are lower than that of GJ 1243 (M4) and YZ CMi (M4.5), roughly in the middle of those of three M5-type stars and higher than the average FFDs of spectral types >= M6. We performed, for the first time to Ross 15, simultaneous high-cadence spectroscopic and photometric observations, resulting in detection of the most energetic flare in our sample. The intensity enhancements of the continuum and Balmer lines with significant correlations between them are detected during the flare, which is same with that of the other deeply studied flare stars of the similar spectral type.
description: 11 pages, 6 figures, accepted for publication in Research in Astronomy and Astrophysics (RAA)
Fuzzy 5-spheres and pp-wave Matrix Actions
Creators: name: Lozano, Yolanda
name: Rodriguez-Gomez, Diego
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the action describing N coincident gravitational waves in M-theory we construct a pp-wave Matrix model cointaning a fuzzy 5-sphere giant graviton solution. This fuzzy 5-sphere is constructed as a U(1) fibration over a fuzzy $CP^2$, and has the correct dependence of the radius with the light-cone momentum, $r^4\sim p^+$, to approach the 5-sphere giant graviton solution of Mc.Greevy et al in the large N limit.
description: 15 pages, references added
Measurement of non-axisymmetry in centres of advanced mergers of galaxies
Creators: name: Jog, Chanda J.
name: Maybhate, Aparna
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We measure the non-axisymmetry in the luminosity distribution in the inner few kpc of the remnants of advanced mergers of galaxies with a view to understand the relaxation in the central regions. For this, we analyze the images from the 2MASS archival data for a selected sample of 12 merging galaxies, which show signs of interaction but have a single nucleus. The central regions are fitted by elliptical isophotes whose centres are allowed to vary to get the best fit. The centres of isophotes show a striking sloshing pattern with a spatial variation of up to 20-30 % within the central 1 kpc. This indicates mass asymmetry and a dynamically unrelaxed behaviour. Next, we Fourier-analyze the galaxy images while keeping the centre constant and measure the deviation from axisymmetry in terms of the fractional Fourier amplitudes (A_1, A_2 etc) as a function of radius. All mergers show a high value of lopsidedness (upto A_1 ~ 0.2) in the central 5 kpc. The m=2 asymmetry is even stronger, with values of A_2 upto ~ 0.3, and in three cases these are shown to represent bars. The corresponding values denoting non-axisymmetry in inner regions of a control sample of eight non-merger galaxies are found to be several times smaller. Surprisingly, this central asymmetry is seen even in mergers where the outer regions have relaxed into a smooth elliptical-like r^{1/4} profile or a spiral-like exponential profile. Thus the central asymmetry is long-lived, estimated to be ~ 1 Gyr, and hence lasts for over 100 local dynamical timescales. These central asymmetries are expected to play a key role in the future dynamical evolution of the central region of a merger, and can help in feeding a central AGN.
description: 14 pages, 3 figures, accepted for publication in MNRAS
Geometry and the anomalous Hall effet in ferromagnets
Creators: name: Ong, N. P.
name: Lee, Wei-Li
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The geometric ideas underlying the Berry phase and the modern viewpoint of Karplus and Luttinger's theory of the anomalous Hall effect are discussed in an elementary way. We briefly review recent Hall and Nernst experiments which support the dominant role of the KL velocity term in ferromagnets.
description: 6 pages, 4 figures, conference proceedings, tutorial review
The role of chromatin in T cell gene transcription
Creators: name: Lim, Pek Siew Chloe
Publisher: name: The Australian National University
Year: 2010
Subjects: subject: QH599 .L56 2010
subject: Chromatin
subject: Genetic transcription
subject: T cells

description: Specific chromatin characteristics, especially the modification status of the core histone proteins, are associated with active and inactive genes. There is also growing evidence that genes that respond to environmental or developmental signals may possess distinct chromatin marks. Using two approaches, mining of ChIP-seq data and ChIP-qPCR for individual genes, this thesis sought to define the chromatin signature of inducible genes in T cells. Inducible genes with low basal expression, especially rapidly induced primary response genes (genes that do not need new protein synthesis), are more likely to display the histone modifications of active genes than their non-responsive counterparts. In addition, the majority of inducible, low basal expression genes with an active chromatin signature also have RNA polymerase II (Pol II) at their promoters suggesting a close link between Pol II recruitment and the presence of active chromatin marks. In tum, the majority of these genes show evidence of ongoing elongation as measured by the presence of H3K36me3, a mark of elongation, in the gene body. In contrast, genes with slower kinetics of expression (secondary response genes that need new protein synthesis) have less active chromatin marks and Pol II at the promoter. Following T cell activation, there was little evidence for a major shift in the active chromatin signature around inducible gene promoters but many genes recruit more Pol II and show increased evidence of elongation. These results suggest that the majority of inducible genes are primed for activation by having an active chromatin signature and a basal level of Pol II activity. Ultimately, these studies contribute to the growing knowledge of the epigenetic landscape and highlight the importance of chromatin regulation ofinducible gene expression in the immune response of a complex organism.
Density-induced suppression of the alpha-particle condensate in nuclear matter and the structure of alpha cluster states in nuclei
Creators: name: Funaki, Y.
name: Horiuchi, H.
name: Röpke, G.
name: Schuck, P.
name: Tohsaki, A.
name: Yamada, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: At low densities, with decreasing temperatures, in symmetric nuclear matter alpha-particles are formed, which eventually give raise to a quantum condensate with four-nucleon alpha-like correlations (quartetting). Starting with a model of alpha-matter, where undistorted alpha particles interact via an effective interaction such as the Ali-Bodmer potential, the suppression of the condensate fraction at zero temperature with increasing density is considered. Using a Jastrow-Feenberg approach, it is found that the condensate fraction vanishes near saturation density. Additionally, the modification of the internal state of the alpha particle due to medium effects will further reduce the condensate. In finite systems, an enhancement of the S state wave function of the c.o.m. orbital of alpha particle motion is considered as the correspondence to the condensate. Wave functions have been constructed for self-conjugate 4n nuclei which describe the condensate state, but are fully antisymmetrized on the nucleonic level. These condensate-like cluster wave functions have been successfully applied to describe properties of low-density states near the n alpha threshold. Comparison with OCM calculations in 12C and 16O shows strong enhancement of the occupation of the S-state c.o.m. orbital of the alpha-particles. This enhancement is decreasing if the baryon density increases, similar to the density-induced suppression of the condensate fraction in alpha matter. The ground states of 12C and 16O show no enhancement at all, thus a quartetting condensate cannot be formed at saturation densities.
description: 7 pages, 3 figure, submitted to Phys. Rev. C
The G_2 spinorial geometry of supersymmetric IIB backgrounds
Creators: name: Gran, U.
name: Gutowski, J.
name: Papadopoulos, G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We solve the Killing spinor equations of supersymmetric IIB backgrounds which admit one supersymmetry and the Killing spinor has stability subgroup G_2 in Spin(9,1) x U(1). We find that such backgrounds admit a time-like Killing vector field and the geometric structure of the spacetime reduces from Spin(9,1) x U(1) to G_2. We determine the type of G_2 structure that the spacetime admits by computing the covariant derivatives of the spacetime forms associated with the Killing spinor bilinears. We also solve the Killing spinor equations of backgrounds with two supersymmetries and Spin(7)\ltimes R^8-invariant spinors, and four supersymmetries with SU(4)\ltimes R^8- and with G_2-invariant spinors. We show that the Killing spinor equations factorize in two sets, one involving the geometry and the five-form flux, and the other the three-form flux and the scalars. In the Spin(7)\ltimes R^8 and SU(4)\ltimes R^8 cases, the spacetime admits a parallel null vector field and so the spacetime metric can be locally described in terms of Penrose coordinates adapted to the associated rotation free, null, geodesic congruence. The transverse space of the congruence is a Spin(7) and a SU(4) holonomy manifold, respectively. In the G_2 case, all the fluxes vanish and the spacetime is the product of a three-dimensional Minkowski space with a holonomy G_2 manifold.
description: 72 pages
Local-field correction to the spontaneous decay rate of atoms embedded in bodies of finite size
Creators: name: Dung, Ho Trung
name: Buhmann, Stefan Yoshi
name: Welsch, Dirk-Gunnar
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The influence of the size and shape of a dispersing and absorbing dielectric body on the local-field corrected spontaneous-decay of an excited atom embedded in the body is studied on the basis of the real-cavity model. By means of a Born expansion of the Green tensor of the system it is shown that to linear order in the susceptibility of the body the decay rate exactly follows Tomas's formula found for the special case of an atom at the center of a homogeneous dielectric sphere [Phys. Rev. A 63, 053811 (2001)]. It is further shown that for an atom situated at the interior of an arbitrary dielectric body this formula remains valid beyond the linear order. The case of an atom embedded in a weakly polarizable sphere is discussed in detail.
description: 12 pages, 6 figures, minor additions
Two-dimensional model of a high-Tc superconducting dynamo
Creators: name: Prigozhin, Leonid
name: Sokolovsky, Vladimir
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences
subject: 65N30, 65T50

description: High temperature superconducting dynamos are capable of low loss contactless pumping large dc currents into superconducting magnet coils. We present a model of such devices and use efficient numerical methods for computing the two-dimensional loop currents and electric fields induced in the thin superconducting stator strip by a dynamo rotor mounted permanent magnet. We find also the voltages generated in the stator under the open circuit conditions. It is shown that if the length of a permanent magnet is comparable to or smaller than the strip width, the one-dimensional model employed in the previous works can be inaccurate.
description: to appear in IEEE TAS
The kinematical structure of gravitationally lensed arcs
Creators: name: Moeller, Ole
name: Noordermeer, Edo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper the expected properties of the velocity fields of strongly lensed arcs behind galaxy clusters are investigated. The velocity profile along typical lensed arcs is determined by ray tracing light rays from a model source galaxy through parametric cluster toy-models consisting of individual galaxies embedded in a dark cluster halo. We find that strongly lensed arcs of high redshift galaxies show complex velocity structures that are sensitive to the details of the mass distribution within the cluster, in particular at small scales. From fits to the simulated imaging and kinematic data we demonstrate that reconstruction of the source velocity field is in principle feasible: two dimensional kinematic information obtained with Integral Field Units (IFU's) on large ground based telescopes in combination with adaptive optics will allow the reconstruction of rotation curves of lensed high redshift galaxies. This makes it possible to determine the mass-to-light ratios of galaxies at redshifts z>1 out to about 2-3 scale lengths with better than about 20% accuracy. We also discuss the possibilities of using two dimensional kinematic information along the arcs to give additional constraints on the cluster lens mass models.
description: 15 pages, 12 figures, 2 tables. Accepted for publication in MNRAS
Text: Poaching
Creators: name: Quenamá Lucitante, Abrahan Geovany
name: Dabkowski, Maksymilian
name: Quenamá, Leidy
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: con

description: Before, his grandparents lived in Sinangoé, but later the mestizos came and they started hunting animals illegally. But today's youth now protects the forests so that the mestizos do not poach, and they are fighting for their territory in Sinangoé.
Moduli stabilization with non-geometric fluxes -- comments on tadpole contributions and de-Sitter vacua
Creators: name: Plauschinn, Erik
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study moduli stabilization for type IIB orientifold compactifications on Calabi-Yau three-folds with (non-)geometric fluxes. For this setting it is possible to stabilize all closed-string moduli classically without the need for non-perturbative contributions, and examples of stable de-Sitter constructions can be found in the literature which violate a prominent swampland conjecture. In this paper we derive general properties of non-geometric flux-compactifications, we argue that the contribution of fluxes to the tadpole cancellation conditions should be similar to D-branes (and not anti-D-branes), and we exclude supersymmetric Minkowski vacua for certain cases. We also reassess known stable de-Sitter constructions with (non-)geometric H-, F-, Q- and R-fluxes and argue that these are not consistent in string theory.
description: 37 pages; v2: references added, discussion in section 3 extended, published version
Aplicação de critérios de durabilidade no desenvolvimento de protótipos de mobiliários públicos utilizando madeira serrada de reflorestamento
Creators: name: Tomiatti, Marina
Publisher: name: figshare
Year: 2021
Subjects: subject: 120305 Industrial Design
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: 120508 Urban Design
subject: FOS: Social and economic geography
subject: 120302 Design Innovation

description: Considerando que uma das atuais demandas da sociedade é a produção e o consumo responsável de produtos que incorporem conceitos de sustentabilidade no seu ciclo de vida, este projeto de pesquisa objetiva desenvolver estudos sobre durabilidade utilizando a madeira de reflorestamento da espécie Corymbia citriodora e sua aplicação em projetos de mobiliário público. É uma espécie abundante na região de central do Estado de São Paulo, mas ainda é pouco utilizada na indústria moveleira por carregar estigmas associados à sua qualidade, tornando necessário estudos mais aprofundados de suas características para a geração de produtos com design aplicado que possua elevada durabilidade e baixo impacto ambiental durante o processo produtivo. A metodologia a ser adotada neste trabalho pode ser classificada como pesquisa aplicada porque almeja a geração de novos produtos e conhecimentos utilizando a análise e problematização de questões específicas do design de mobiliários. Se organiza em três grupos: caracterização da madeira; estabelecimento de diretrizes de durabilidade; e projeto e produção. Os resultados esperados deste estudo são: aplicação das diretrizes de durabilidade estabelecidas a partir do material teórico estudado, desenvolvimento de peças gráficas e protótipos físicos e a análise dos dados coletados nas etapas de produção
title: Archipelagic poetics: ecology in modern Scottish and Irish poetry
Creators: name: Campbell, Alexandra
Publisher: name: University of Glasgow
Year: 2018
Subjects: subject: Ecopoetry, ecocriticism, archipelagic studies, Scottish and Irish studies, blue humanities.

description: This thesis examines a range of poets from Ireland, Northern Ireland and Scotland from the Modernist period to the present day, who take the relationship between humans, poetry and the natural world as a primary point of concern. Through precise, materially attentive engagements with the coastal, littoral, and oceanic dimensions of place, Louis MacNeice, Hugh MacDiarmid, Derek Mahon, Michael Longley, Kathleen Jamie, John Burnside, Moya Cannon, Mary O’Malley and Jen Hadfield, respectively turn towards the vibrant space of the Atlantic archipelago in order to contemplate new modes of relation that are able to contend with the ecological and political questions engendered by environmental crises. Across their works, the archipelago emerges as a physical and critical site of poetic relation through which poets consider new pluralised, devolved, and ‘entangled’ relationships with place. Derived from the geographic term for ‘[a]ny sea, or sheet of water, in which there are numerous islands’, the concept of the ‘archipelago’ has recently gained critical attention within Scottish and Irish studies due to its ability to re-orientate the critical axis away from purely Anglocentric discourses. Encompassing a range of spatial frames from bioregion to biosphere, islands to oceans, and temporal scales from deep pasts to deep futures, the poets considered here turn to the archipelago as a means of reckoning with the fundamental questions that the Anthropocene poses about the relationships between humans and the environment. Crucially, through a series of comparative readings, the project presents fresh advancements in ecocritical scholarship, with regards to the rise of material ecocriticism, postcolonial ecocriticism, and the ‘Blue Humanities’.
Direct radio discovery of a cold brown dwarf
Creators: name: Vedantham, H. K.
name: Callingham, J. R.
name: Shimwell, T. W.
name: Dupuy, T.
name: Best, William M. J.
name: Liu, Michael C.
name: Zhang, Zhoujian
name: De, K.
name: Lamy, L.
name: Zarka, P.
name: Rottgering, H. J. A.
name: Shulevski, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Magnetospheric processes seen in gas-giants such as aurorae and circularly-polarized cyclotron maser radio emission have been detected from some brown dwarfs. However, previous radio observations targeted known brown dwarfs discovered via their infrared emission. Here we report the discovery of BDR J1750+3809, a circularly polarized radio source detected around 144 MHz with the LOFAR telescope. Follow-up near-infrared photometry and spectroscopy show that BDR J1750+3809 is a cold methane dwarf of spectral type T$6.5\pm 1$ at a distance of $65^{+9}_{-8}\,{\rm pc}$. The quasi-quiescent radio spectral luminosity of BDR J1750+3809 is $\approx 5\times 10^{15}\,{\rm erg}\,{\rm s}^{-1}\,{\rm Hz}^{-1}$ which is over two orders of magnitude larger than that of the known population of comparable spectral type. This could be due to a preferential geometric alignment or an electrodynamic interaction with a close companion. In addition, as the emission is expected to occur close to the electron gyro-frequency, the magnetic field strength at the emitter site in BDR J1750+3809 is $B\gtrsim 25\,{\rm G}$, which is comparable to planetary-scale magnetic fields. Our discovery suggests that low-frequency radio surveys can be employed to discover sub-stellar objects that are too cold to be detected in infrared surveys.
description: Accepted for publication in ApJL
Spectroscopy in ep collisions at HERA
Creators: name: Ozerov, Dmitry
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Recent spectroscopy studies performed in high energy ep collisions by the H1 and ZEUS Collaborations are described. The status of the searches for the strange pentaquark, the Theta+, is presented as well as results on searches for further exotic states such as the Sigma--. The evidence for the observation of a pentaquark state containing the charmed quark, the Theta_c, is discussed and the result is given on searches for glueball candidates at HERA.
description: 4 pages, 6 figures, Presented at the Baryons04 Conference, October 25-29, 2004, Palaiseau, France. To be published with the conference proceedings in Nuclear Physics A
Monopole confinement by flux tube
Creators: name: Chatterjee, Chandrasekhar
name: Lahiri, Amitabha
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit Nambu's model of quark confinement by a tube of magnetic flux, with two additional features. The quarks are taken to be magnetic monopoles external to the tube, which seal the ends, and are also taken to be fermions. This ensures that the model is inconsistent unless there are at least two species of fermions being confined.
description: 7pp; brief additions relating monopole strength to winding number, and discussion on length of stable flux tube; one reference added
Beam Test Performance and Simulation of Prototypes for the ALICE Silicon Pixel Detector
Creators: name: Conrad, Jan
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The silicon pixel detector (SPD) of the ALICE experiment in preparation at the Large Hadron Collider (LHC) at CERN is designed to provide the precise vertex reconstruction needed for measuring heavy flavor production in heavy ion collisions at very high energies and high multiplicity. The SPD forms the innermost part of the Inner Tracking System (ITS) which also includes silicon drift and silicon strip detectors. Single assembly prototypes of the ALICE SPD have been tested at the CERN SPS using high energy proton/pion beams in 2002 and 2003. We report on the experimental determination of the spatial precision. We also report on the first combined beam test with prototypes of the other ITS silicon detector technologies at the CERN SPS in November 2004. The issue of SPD simulation is briefly discussed.
description: 4 pages, 5 figures, prepared for proceedings of 7th International Position Sensitive Detectors Conference, Liverpool, Sept. 2005
CR-submanifolds. A class of examples
Creators: name: Ornea, Liviu
Publisher: name: arXiv
Year: 2005
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C55, 53C40, 53C25

description: I present a class of examples of \CR-submanifolds of manifolds endowed with different structures, obtained as level sets of momentum maps associated to specific Hamiltonian actions.
Dynamics of sliding drops on superhydrophobic surfaces
Creators: name: Dupuis, A.
name: Yeomans, J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We use a free energy lattice Boltzmann approach to investigate numerically the dynamics of drops moving across superhydrophobic surfaces. The surfaces comprise a regular array of posts small compared to the drop size. For drops suspended on the posts the velocity increases as the number of posts decreases. We show that this is because the velocity is primarily determined by the contact angle which, in turn, depends on the area covered by posts. Collapsed drops, which fill the interstices between the posts, behave in a very different way. The posts now impede the drop behaviour and the velocity falls as their density increases.
description: 7 pages, 4 figures, accepted for publication in Europhys. Lett
Radiative decays of charged leptons as constraints of unitarity polygons for active-sterile neutrino mixing and CP violation
Creators: name: Xing, Zhi-zhong
name: Zhang, Di
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We calculate the rates of radiative $β^- \to α^- + γ$ decays for $(α, β) = (e, μ)$, $(e, τ)$ and $(μ, τ)$ by taking the {\it unitary} gauge in the $(3+n)$ active-sterile neutrino mixing scheme, and make it clear that constraints on the unitarity of the $3\times 3$ Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix $U$ extracted from $β^- \to α^- + γ$ decays in the {\it minimal unitarity violation} scheme differ from those obtained in the canonical seesaw mechanism with $n$ heavy Majorana neutrinos by a factor $5/3$. In such a natural seesaw case we show that the rates of $β^- \to α^- + γ$ can be used to cleanly and strongly constrain the effective apex of a unitarity polygon, and compare its geometry with the geometry of its three sub-triangles formed by two vectors $U^{}_{αi} U^*_{βi}$ and $U^{}_{αj} U^*_{βj}$ (for $i \neq j$) in the complex plane. We find that the areas of such sub-triangles can be described in terms of the Jarlskog-like invariants of CP violation ${\cal J}^{ij}_{αβ}$, and their small differences signify slight unitarity violation of the PMNS matrix $U$.
description: 26 pages, 5 figures, and the version accepted for publication in EPJC
A Multistep Algorithm for the Radiation Hydrodynamical Transport of Cosmological Ionization Fronts and Ionized Flows
Creators: name: Whalen, Daniel J.
name: Norman, Michael L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Radiation hydrodynamical transport of ionization fronts in the next generation of cosmological reionization simulations holds the promise of predicting UV escape fractions from first principles as well as investigating the role of photoionization in feedback processes and structure formation. We present a multistep integration scheme for radiative transfer and hydrodynamics for accurate propagation of I-fronts and ionized flows from a point source in cosmological simulations. The algorithm is a photon-conserving method which correctly tracks the position of I-fronts at much lower resolutions than non-conservative techniques. The method applies direct hierarchical updates to the ionic species, bypassing the need for the costly matrix solutions required by implicit methods while retaining sufficient accuracy to capture the true evolution of the fronts. We review the physics of ionization fronts in power-law density gradients, whose analytical solutions provide excellent validation tests for radiation coupling schemes. The advantages and potential drawbacks of direct and implicit schemes are also considered, with particular focus on problem timestepping which if not properly implemented can lead to morphologically plausible I-front behavior that nonetheless departs from theory. We also examine the effect of radiation pressure from very luminous central sources on the evolution of I-fronts and flows.
description: 25 pages, 16 figures, accepted to ApJ. Minor revisions included. Full resolution PDF available at http://cosmos.ucsd.edu/~dwhalen/downloads/dwhalen_zeusmp_method.pdf
Collective atomic correlations in absorptive optical bistability without adiabatic elimination: exemplifying nonclassicality from a linearized treatment of fluctuations
Creators: name: Mavrogordatos, Th. K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We determine the incoherent spectrum, squeezing properties and second-order correlation function of the collective atomic degrees of freedom in absorptive optical bistability. This is accomplished via a linearized Fokker-Planck equation in the positive P representation, guided by the analysis of [H. J. Carmichael, Phys. Rev. A 33, 3262 (1986)] which does not resort to adiabatic elimination. We focus on the regimes of weak and strong intracavity excitation, addressing the good-cavity and bad-cavity limits as well as the limit of collective strong coupling. Adiabatic elimination of the intracavity field sustained by an auxiliary resonator coupled to the ensemble is used to probe the atomic correlations via the formation of a collective emission channel. We compare to the corresponding expressions for the forwards-scattered light with reference to experimental results, discussing key differences between the lower and upper branch of the steady-state semiclassical bistability curve. Our analysis is carried out around the stable states situated far away from the turning points, where analytical expressions can be obtained self-consistently, demonstrating a clear departure from classical behavior.
description: 16 pages, 3 figures, 59 references, with minor modifications and corrected typos (especially in Sec. VI), following the published version
First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
Creators: name: NA60 Collaboration
name: Arnaldi, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium collisions at the CERN SPS. A significant excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of 360 000 dimuons and the good mass resolution of about 2% allow us to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum is consistent with a dominant contribution from pi+pi-->rho-->mu+mu- annihilation. The associated space-time averaged rho spectral function shows a strong broadening, but essentially no shift in mass. This may rule out theoretical models linking hadron masses
Pulsed-gate spectroscopy of single-electron spin states in bilayer graphene quantum dots
Creators: name: Banszerus, Luca
name: Hecker, Katrin
name: Icking, Eike
name: Trellenkamp, Stefan
name: Lentz, Florian
name: Neumaier, Daniel
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Volk, Christian
name: Stampfer, Christoph
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Graphene and bilayer graphene quantum dots are promising hosts for spin qubits with long coherence times. Although recent technological improvements make it possible to confine single electrons electrostatically in bilayer graphene quantum dots, and their spin and valley texture of the single particle spectrum has been studied in detail, their relaxation dynamics remains still unexplored. Here, we report on transport through a high-frequency gate controlled single-electron bilayer graphene quantum dot. By transient current spectroscopy of single-electron spin states, we extract a lower bound of the spin relaxation time of 0.5~$μ$s. This result represents an important step towards the investigation of spin coherence times in graphene-based quantum dots and the implementation of spin-qubits.
description: 6 Pages, 4 Figures
A Clepsis dumicolana (Zeller, 1847) új faj Magyarországon és földrajzi elterjedése Európában (Lepidoptera: Tortricidae)
Creators: name: Fazekas, Imre
name: Halász, Antal
Publisher: name: Pannon Intézet
Year: 2020

description: microlepidoptera.hu. ISSN 2062-6738. Tom. 16. (2020)
Magdalena Gybas, Das Theater in der Stadt und die Stadt im Theater. Urbanistischer Kontext und Funktionen von Theatern im kaiserzeitlichen Kleinasien
Creators: name: Poulsen, Birte
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Magdalena Gybas, Das Theater in der Stadt und die Stadt im Theater. Ur­banistischer Kontext und Funktionen von Theatern im kaiserzeitlichen Klein­asien. Hamburg: Verlag Dr. Kovač 2018. 422 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 23 (2020): Göttinger Forum für Altertumswissenschaft
VietnamChina Trade Relations in the Feudal Period: From the Early 10th to the Late 19th Century
Creators: name: Nguyen Thi My Hanh
Publisher: name: Center for Research on Plurality in the Mekong Region (CERP)
Year: 2015
Subjects: Vietnam, China, relations, trade, feudal

description: 3, 11, Journal of Mekong Societies
Coleophora grotenfelti Tabell Kosorín, a new species belonging to the C. dianthi species complex (Lepidoptera: Coleophoridae)
Creators: name: Tabell, Jukka
name: Kosorín, František
Publisher: name: Pannon Intézet
Year: 2020

description: microlepidoptera.hu. ISSN 2062-6738. Tom. 16. (2020)
title: Selbstreguliertes Lernen im Mathematikunterricht der Sekundarstufe
Creators: name: Rusznak, Sophie
Year: 2023

description: Die vorliegende Masterarbeit widmet sich dem Thema „Selbstreguliertes Lernen in der Sekundarstufe" und untersucht verschiedene Gesichtspunkte dieses pädagogischen Ansatzes. Die Forschungsfragen konzentrieren sich auf Methoden zur Förderung des selbstregulierten Lernens, die Einschätzung von Lehrpersonen zu den Möglichkeiten und Grenzen im Mathematikunterricht sowie die Analyse eingesetzter Unterrichtsformen. Der theoretische Teil der Arbeit behandelt das Konzept des selbstregulierten Lernens unter Berücksichtigung von Selbst, Regulation und Lernen. Schlüsselbegriffe wie Metakognition und Fremdregulation werden erörtert, wobei dabei die Rolle des Lehrenden beschrieben wird. Modelle des selbstregulierten Lernens nach Schreiber (1998) und Boekaerts (1999) werden vorgestellt, woraus eine Auseinandersetzung mit Lernstrategien und der Einsatz von Problemlöse- und Modellierungsaufgaben resultiert. Der zweite Teil beinhaltet die Auswertung eines Fragebogens, den 52 Lehrkräfte der Sekundarstufe I und II ausgefüllt haben. Die qualitative Analyse der Umfrageergebnisse ermöglicht Einblicke in die praktische Anwendung und Einschätzung des selbstregulierten Lernens aus Sicht der Lehrenden. Subkategorien, die anhand der qualitativen Inhaltsanalyse nach Kuckartz und Rädiker (2022) identifiziert wurden, beleuchten Voraussetzungen, Schwierigkeiten und die konkrete Umsetzung im Mathematikunterricht. Zusammenfassend lässt sich feststellen, dass ein Großteil der befragten Lehrpersonen selbstregulative Prozesse im Unterricht einsetzt, jedoch Schwierigkeiten bei den Lernenden, den Rahmenbedingungen und der dafür benötigten Zeit verorten. Ein weiteres Ergebnis der Auswertung des Fragebogens ist, dass der Einsatz selbstregulativer Lernprozesse augenscheinlich von unterschiedlichen Faktoren wie Geschlecht, Dienstalter oder Schulform beeinflusst wird.
On the intensity and spatial morphology of the 511 keV emission in the Milky Way
Creators: name: Prantzos, Nikos
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The positron emissivity of the Galactic bulge and disk, resulting from radioactivity of SNIa, is reassessed in the light of a recent evaluation of the SNIa rate. It is found that the disk may supply more positrons than required by recent SPI/INTEGRAL observations, but the bulge (where the characteristic positron annihilation line at 511 keV is in fact observed) only about 10%. It is argued that a large fraction of the disk positrons may be transported via the regular magnetic field of the Galaxy into the bulge, where they annihilate. This would increase both the bulge emissivity and the bulge/disk ratio, alleviating considerably the constraints imposed by INTEGRAL data analysis. We argue that the bulge/disk positron emissivity ratio can be considerably smaller than the values derived by the recent analysis of Knoedlseder et al. (2005), if the disk positrons diffuse sufficiently away from their sources, as required by our model; this possibility could be tested in the future, as data are accumulated in the SPI detectors. The success of the proposed scenario depends critically upon the, very poorly known at present, properties of the galactic magnetic field and of the propagation of low energy positrons in it.
description: 11 pages, 7 figures, to appear in Astronomy and Astrophysics
Detailed analysis of a pseudoresonant interaction between cellular flames and velocity turbulence
Creators: name: Karlin, V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: This work is dedicated to the analysis of the delicate details of the effect of upstream velocity fluctuations on the flame propagation speed. The investigation was carried out using the Sivashinsky model of cellularisation of hydrodynamically unstable flame fronts. We identified the perturbations of the steadily propagating flames which can be significantly amplified over finite periods of time. These perturbations were used to model the effect of upstream velocity fluctuations on the flame front dynamics and to study a possibility to control the flame propagation speed.
description: 20 pages, 13 figures in 31 EPS files
In Praise and in Criticism of the Model of Continuous Spontaneous Localization of the Wave-Function
Creators: name: Wechsler, Sofia D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Different attempts to solve the measurement problem of the quantum mechanics (QM) by denying the collapse principle, and replacing it with changes in the quantum formalism, failed because the changes in the formalism lead to contradictions with QM predictions. To the difference, Ghirardi, Rimini and Weber took the collapse as a real phenomenon, and proposed a calculus by which the wave-function should undergo a sudden localization. Later on, Ghirardi, Pearle and Rimini came with a change of this calculus into the CSL (continuous spontaneous localization) model of collapse. Both these proposals rely on the experimental fact that the reduction of the wave-function occurs when the microscopic system encounters a macroscopic object and involves a big amount of its particles. Both of them also change the quantum formalism by introducing in the Schrodinger equation additional terms with noisy behavior. However, these terms have practically no influence as long as the studied system contains only one or a few components. Only when the amount of components is very big, these terms become significant and lead to the reduction of the wave-function to one of its components. The present work has two purposes: 1) proving that the collapse postulate is unavoidable; 2) applying the CSL model to the process in a detector and showing step by step the modification of the wave-function, until reduction. As a side detail, it is argued here that the noise cannot originate in some classical field, contrary to the thought/hope of some physicists, because no classical field is tailored by the wave-functions of entanglements.
description: 30 pages, 7 figures. In this version some proofs are simplified with respect to version 1
Text: Story of Kunsiana
Creators: name: Quenamá Lucitante, Graciela
name: Dabkowski, Maksymilian
name: Aguinda, Shen
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: con

description: Many people were killed and their bodies were placed here to rot. Because of this, the Condor Queen came down, a young man won her over, and they had children. At the end, she went back, leaving a daughter behind.
Nostos - Spherical TPCs
Creators: name: Gorodetzky, P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: A new concept, the spherical TPC, presents unique advantages when low energy neutrinos are to be detected. Some of the applications are: a) observation of the e oscillation when emitted by a tritium source ( = 14 keV) in a 10 m radius sphere. This project, baptized NOSTOS, intends to give the mixing angle 13, the Weinberg angle and a much lower limit (< 10-12 ?B) of the neutrino magnetic moment, b) an array of small (radius 2-4 m), cheap spheres scattered around the world would be perfect to monitor extragalactic supernovae, c) detect the spectrum of low energy (pp - 7Be) solar neutrinos.
description: XIII International Symposium on Very High Energy Cosmic Ray Interactions at the NESTOR Institute - Pylos, Grece, 6-12 Septembre 2004
Single-site approximation for reaction-diffusion processes
Creators: name: Canet, L.
name: Hilhorst, H. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider the branching and annihilating random walk $A\to 2A$ and $2A\to 0$ with reaction rates $σ$ and $λ$, respectively, and hopping rate $D$, and study the phase diagram in the $(λ/D,σ/D)$ plane. According to standard mean-field theory, this system is in an active state for all $σ/D>0$, and perturbative renormalization suggests that this mean-field result is valid for $d >2$; however, nonperturbative renormalization predicts that for all $d$ there is a phase transition line to an absorbing state in the $(λ/D,σ/D)$ plane. We show here that a simple single-site approximation reproduces with minimal effort the nonperturbative phase diagram both qualitatively and quantitatively for all dimensions $d>2$. We expect the approach to be useful for other reaction-diffusion processes involving absorbing state transitions.
description: 15 pages, 2 figures, published version
Ein Beitrag zur aktuellen Verbreitung und zur Biologie von Acanthopsyche ecksteini (Lederer, 1855) (Lepidoptera, Psychidae)
Creators: name: Weidlich, Michael
Publisher: name: Pannon Intézet
Year: 2020

description: microlepidoptera.hu. ISSN 2062-6738. Tom. 16. (2020)