cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Maxwell-Bloch modeling of an x-ray pulse amplification in a 1D photonic crystal
Creators: name: Peyrusse, O.
name: Jonnard, P.
name: André, J. -M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present an implementation of the Maxwell-Bloch (MB) formalism for the study of x-ray emission dynamics from periodic multilayer materials whether they are artificial or natural. The treatment is based on a direct Finite-Difference-Time-Domain (FDTD) solution of Maxwell equations combined with Bloch equations incorporating a random spontaneous emission noise. Besides periodicity of the material, the treatment distinguishes between two kinds of layers, those being active (or resonant) and those being off-resonance. The numerical model is applied to the problem of $Kα$ emission in multilayer materials where the population inversion could be created by fast inner-shell photoionization by an x-ray free-electron-laser (XFEL). Specificities of the resulting amplified fluorescence in conditions of Bragg diffraction is illustrated by numerical simulations. The corresponding pulses could be used for specific investigations of non-linear interaction of x-rays with matter.
Dodecahedral Structures with Mosseri-Sadoc Tiles
Creators: name: Koca, Nazife Ozdes
name: Koc, Ramazan
name: Koca, Mehmet
name: Al-Siyabi, Abeer
Publisher: name: arXiv
Year: 2020
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 52B10, 52B11, 52B15

description: 3D-facets of the Delone cells representing the deep and shallow holes of the root lattice D6 which tile the six-dimensional Euclidean space in an alternating order are projected into three-dimensional space. They are classified into six Mosseri-Sadoc tetrahedral tiles of edge lengths 1 and golden ratio (tau) with faces normal to the 5-fold and 3-fold axes. The icosahedron, dodecahedron and icosidodecahedron whose vertices are obtained from the fundamental weights of the icosahedral group are dissected in terms of six tetrahedra. A set of four tiles are composed out of six fundamental tiles, faces of which, are normal to the 5-fold axes of the icosahedral group. It is shown that the 3D-Euclidean space can be tiled face-to-face with maximal face coverage by the composite tiles with an inflation factor tau generated by an inflation matrix. We note that dodecahedra with edge lengths of 1 and tau naturally occur already in the second and third order of the inflations. The 3D patches displaying 5-fold, 3-fold and 2-fold symmetries are obtained in the inflated dodecahedral structures with edge lengths tau to the power n with n equals 3 or greater than 3. The planar tiling of the faces of the composite tiles follow the edge-to-edge matching of the Robinson triangles.
description: 21 pages, 9 figures, 2 tables. arXiv admin note: text overlap with arXiv:2008.00862 -Omitted reference is included
Revue Verlaine. 2015, n° 13
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2015
Subjects: subject: Paul Verlaine
subject: Littérature
subject: XIXe siècle
subject: Littérature française du XIXe siècle
subject: Poésie

description: Contributeurs : Sophie Angot, Arnaud Bernadet, Eddie Breuil, Brigitte Buffard-Moret, Nelson Charest, Alain Chevrier, Benoît de Cornulier, Romain Courapied, Solenn Dupas, Yann Frémy, Christian Hervé, Geneviève Hodin, Kensaku Kurakata, Roland Le Huenen, Solène Thomas, Giorgio Villani et Colette Windish.
title: Traffic Accident Rates in Kentucky
title: (1982)
titleType: Subtitle
Creators: name: Agent, Kenneth R.
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1984
Subjects: subject: Transportation Engineering

description: The primary objective of this study was to determine average accident statistics in Kentucky for 1982. These statistics could then be used in Kentucky's high-accident location identification program. The 1982 data were combined with 1980 and 1981 data to calculate more long-term accident statistics. Average accident rates were calculated using several methods of classifying highways. A series of tables was prepared giving criteria that could be used to determine if specific locations have accident problems.
Local well-posedness of skew mean curvature flow for small data in $d\geq 4$ dimensions
Creators: name: Huang, Jiaxi
name: Tataru, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: The skew mean curvature flow is an evolution equation for $d$ dimensional manifolds embedded in $\mathbb{R}^{d+2}$ (or more generally, in a Riemannian manifold). It can be viewed as a Schrödinger analogue of the mean curvature flow, or alternatively as a quasilinear version of the Schrödinger Map equation. In this article, we prove small data local well-posedness in low-regularity Sobolev spaces for the skew mean curvature flow in dimension $d\geq 4$.
Is there a higher-order Mode Coupling transition in polymer blends?
Creators: name: Moreno, Angel J.
name: Colmenero, Juan
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present simulations on a binary blend of bead-spring polymer chains. The introduction of monomer size disparity yields very different relaxation times for each component of the blend. Competition between two different arrest mechanisms, namely bulk-like dynamics and confinement, leads to an anomalous relaxation scenario for the fast component, characterized by sublinear time dependence for mean squared displacements, or logarithmic decay and convex-to-concave crossover for density-density correlators. These anomalous dynamic features, which are observed over time intervals extending up to four decades, strongly resemble predictions of Mode Coupling Theory for nearby higher-order transitions. Chain connectivity extends anomalous relaxation over a wide range of blend compositions.
description: Published in Journal of Chemical Physics 124 (2006) 184906
Oxygen vacancy induced site-selective mott transition in lanio3
Creators: name: Liao, Xingyu
name: Singh, Vijay
name: Park, Hyowon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: While defects such as oxygen vacancies in correlated materials can modify their electronic properties dramatically, understanding the microscopic origin of electronic correlations in materials with defects has been elusive. Lanthanum nickelate with oxygen vacancies, LaNiO$_{3-x}$, exhibits the metal-to-insulator transition as the oxygen vacancy level $x$ increases from the stoichiometric LaNiO$_3$. In particular, LaNiO$_{2.5}$ exhibits a paramagnetic insulating phase, also stabilizing an antiferromagnetic state below $T_N\simeq152$K. Here, we study the electronic structure and energetics of LaNiO$_{3-x}$ using first-principles. We find that LaNiO$_{2.5}$ stabilizes a vacancy-ordered structure with an insulating ground state and the nature of the insulating phase is a "site-selective" paramagnetic Mott state as obtained using density functional theory plus dynamical mean field theory (DFT+DMFT). The Ni octahedron site develops a Mott insulating state with strong correlations as the Ni $e_g$ orbital is half-filled while the Ni square-planar site with apical oxygen vacancies becomes a band insulator. Our oxygen vacancy results can not be explained by the pure change of the Ni oxidation state alone within the rigid band shift approximation. Our DFT+DMFT density of states explains that the peak splitting of unoccupied states in LaNiO$_{3-x}$ measured by the experimental X-ray absorption spectra originates from two nonequivalent Ni ions in the vacancy-ordered structure.
de Gruchy, John, Villa-Vicencio, Charles: Wenn wir wie Brüder beeinander wohnten... von der Apartheid zur bekennenden Kirche - Stellungnahmen südafrikanischer Theologen
Creators: name: Becken, Hans-Jürgen
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 34 Nr. 3 (1985): Ökumenische Rundschau, Band 34, Heft 3
X-rays from Alpha Centauri - The darkening of the solar twin
Creators: name: Robrade, J.
name: Schmitt, J. H. M. M.
name: Favata, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present first results from five XMM-Newton observations of the binary system Alpha Centauri, which has been observed in snapshot like exposures of roughly two hours each during the last two years. In all our observations the X-ray emission of the system is dominated by Alpha Cen B, a K1 star. The derived light curves of the individual components reveal variability on short timescales and a flare was discovered on Alpha Cen B during one observation. A PSF fitting algorithm is applied to the event distribution to determine the brightness of each component during the observations. We perform a spectral analysis with multi-temperature models to calculate the X-ray luminosities.We investigate long term variability and possible activity cycles of both stars and find the optically brighter component Alpha Cen A, a G2 star very similar to our Sun, to have fainted in X-rays by at least an order of magnitude during the observation program, a behaviour never observed before on Alpha Cen A, but rather similar to the X-ray behaviour observed with XMM-Newton on HD 81809. We also compare our data with earlier spatially resolved observations performed over the last 25 years.
description: 7 pages, 11 figures, accepted by A&A
Project-based instruction in a Canadian secondary school's ESL classes : goals and evaluations
Creators: name: Beckett, Gulbahar Huxur
Publisher: name: University of British Columbia
Year: 2009

description: Research on project-based instruction is common in mainstream education. It conceives the activity broadly, but omits language. It is rare in English as a Second Language (ESL) education, and Second Language Acquisition (SLA) theory conceives it narrowly, omitting a functional view of language. The present study examines the implementation of project-based instruction in ESL classes in a Canadian secondary school through interviews with Canadian ESL teachers and Chinese ESL students, observations of two projects in action, and examination of students' written work, and school, school board and Ministry of Education documents. Results indicate that the teachers held and implemented a broad, integrated conception of project-based instruction that includes a functional view of language. They have many more goals than those stressed for project-based instruction in the SLA literature, and have goals that are not included even in the mainstream literature. The teachers evaluated project-based instruction positively, and the researcher's observations support the teachers' evaluations. However, despite teacher's and students' successes, a number of students evaluated project-based instruction negatively. This discrepancy is discussed using three explanatory models (philosophical, cultural, and linguistic) that the participants may have been using when interpreting project-based instruction. The study points to the need to develop a rationale which adequately addresses project-based instruction as a functional language learning activity in the context of academic subject matter learning. It identifies problems of cross-cultural interpretation of and communication about projects, and notes difficulties of resolving them. It points out the necessity for an examination of the processes of project-based instruction, noting places of difficulty and success, and considering promising strategies.
The anomalous $Zb\bar{b}$ couplings: From LEP to LHC
Creators: name: Yan, Bin
name: Yuan, C. -P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The bottom quark forward-backward asymmetry ($A_{FB}^b$) data at LEP exhibits a long-standing discrepancy with the standard model prediction. We propose a novel method to probe the $Zb\bar{b}$ interactions through $gg\to Zh$ production at the LHC, which is sensitive to the axial-vector component of the $Zb\bar{b}$ couplings. We demonstrate that the $Zh$ data collected at the 13 TeV LHC can already resolve the apparent degeneracy of the anomalous $Zb\bar{b}$ couplings implied by the LEP precision electroweak measurements, with a strong dependence on the observed distribution of the $Z$ boson transverse momentum. We also show the potential of the HL-LHC to either verify or exclude the anomalous $Zb\bar{b}$ couplings observed at LEP through measuring the $Zh$ production rate at the HL-LHC, and this conclusion is not sensitive to possible new physics contribution induced by top quark or Higgs boson anomalous couplings in the loop.
description: 6 pages, 6 figurs, matches version published in PRL
Human neurospheres on microelectrode arrays: a model to investigate ionizing radiation effects on neuronal network communication
Creators: name: Mayer, M.
name: Müller, B.
name: Kadereit, S.
name: Ritter, S.
name: Thielemann, C.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
Quantum Correction to Conductivity Close to Ferromagnetic Quantum Critical Point in Two Dimensions
Creators: name: Paul, I.
name: Pépin, C.
name: Narozhny, B. N.
name: Maslov, D. L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the temperature dependence of the conductivity due to quantum interference processes for a two-dimensional disordered itinerant electron system close to a ferromagnetic quantum critical point. Near the quantum critical point, the cross-over between diffusive and ballistic regimes of quantum interference effects occurs at a temperature $ T^{\ast}=1/τγ(E_{F}τ)^{2}$, where $γ$ is the parameter associated with the Landau damping of the spin fluctuations, $τ$ is the impurity scattering time, and $E_{F}$ is the Fermi energy. For a generic choice of parameters, $T^{\ast}$ is smaller than the nominal crossover scale $1/τ$. In the ballistic quantum critical regime, the conductivity behaves as $T^{1/3}$.
description: 5 pages, 1 figure
The operator product expansion for perturbative quantum field theory in curved spacetime
Creators: name: Hollands, Stefan
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present an algorithm for constructing the Wilson operator product expansion (OPE) for perturbative interacting quantum field theory in general Lorentzian curved spacetimes, to arbitrary orders in perturbation theory. The remainder in this expansion is shown to go to zero at short distances in the sense of expectation values in arbitrary Hadamard states. We also establish a number of general properties of the OPE coefficients: (a) they only depend (locally and covariantly) upon the spacetime metric and coupling constants, (b) they satisfy an associativity property, (c) they satisfy a renormalization group equation, (d) they satisfy a certain microlocal wave front set condition, (e) they possess a ``scaling expansion''. The latter means that each OPE coefficient can be written as a sum of terms, each of which is the product of a curvature polynomial at a spacetime point, times a Lorentz invariant Minkowski distribution in the tangent space of that point. The algorithm is illustrated in an example.
description: 45 pages, Latex, 4 figures
Two-variable logic has weak, but not strong, Beth definability
Creators: name: Andréka, H.
name: Németi, I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03C40 (Primary) 03B20, 03Cxx, 03C95 (Secondary)

description: We prove that the two-variable fragment of first-order logic has the weak Beth definability property. This makes the two-variable fragment a natural logic separating the weak and the strong Beth properties since it does not have the strong Beth definability property.
Characterizing Political Campaigning with Lexical Mutants on Indian Social Media
Creators: name: Phadke, Shruti
name: Mitra, Tanushree
Publisher: name: arXiv
Year: 2024
Subjects: subject: Social and Information Networks (cs.SI)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Increasingly online platforms are becoming popular arenas of political amplification in India. With known instances of pre-organized coordinated operations, researchers are questioning the legitimacy of political expression and its consequences on the democratic processes in India. In this paper, we study an evolved form of political amplification by first identifying and then characterizing political campaigns with lexical mutations. By lexical mutation, we mean content that is reframed, paraphrased, or altered while preserving the same underlying message. Using multilingual embeddings and network analysis, we detect over 3.8K political campaigns with text mutations spanning multiple languages and social media platforms in India. By further assessing the political leanings of accounts repeatedly involved in such amplification campaigns, we contribute a broader understanding of how political amplification is used across various political parties in India. Moreover, our temporal analysis of the largest amplification campaigns suggests that political campaigning can evolve as temporally ordered arguments and counter-arguments between groups with competing political interests. Overall, our work contributes insights into how lexical mutations can be leveraged to bypass the platform manipulation policies and how such competing campaigning can provide an exaggerated sense of political divide on Indian social media.
Hierarchical Mass Structure of Fermions in Warped Extra Dimension
Creators: name: Chang, Sanghyeon
name: Kim, C. S.
name: Yamaguchi, Masahiro
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The warped bulk standard model has been studied in the Randall-Sundrum background on $S^1/\Z\times\Z'$ interval with the bulk gauge symmetry $SU(3)\times SU(2)_L\times SU(2)_R\times U(1)_{B-L}$. With the assumption of no large cancellation between the fermion flavor mixing matrices, we present a simple analytic method to determine the bulk masses of standard model fermions in the almost universal bulk Yukawa coupling model. We also predict $U_{e3}$ element of MNS matrix to be near the experimental upper bound when the neutrino masses are of Dirac type.
description: 16 pages
Observational Gamma-ray Cosmology
Creators: name: Primack, Joel R.
name: Bullock, James S.
name: Somerville, Rachel S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss how measurements of the absorption of gamma-rays from GeV to TeV energies via pair production on the extragalactic background light (EBL) can probe important issues in galaxy formation. Semi-analytic models (SAMs) of galaxy formation, based on the flat LCDM hierarchical structure formation scenario, are used to make predictions of the EBL from 0.1 to 1000 microns. SAMs incorporate simplified physical treatments of the key processes of galaxy formation -- including gravitational collapse and merging of dark matter halos, gas cooling and dissipation, star formation, supernova feedback and metal production. We will summarize SAM successes and failures in accounting for observations at low and high redshift. New ground- and space-based gamma ray telescopes will help to determine the EBL, and also help to explain its origin by constraining some of the most uncertain features of galaxy formation theory, including the stellar initial mass function, the history of star formation, and the reprocessing of light by dust. On a separate topic concerning gamma ray cosmology, we discuss a new theoretical insight into the distribution of dark matter at the center of the Milky Way, and its implications concerning the high energy gamma rays observed from the Galactic center.
description: 11 pages, 7 figures, to appear in the proceedings of the Gamma 2004 Symposium on High Energy Gamma Ray Astronomy, Heidelberg, July 2004 (AIP Proceedings Series)
Microenvironment adapted treatment planning for ion beams
Creators: name: Emanuele, S.
name: Tinganelli, W.
name: Durante, M.
name: Kraft-Weyrather, W.
name: Maier, A.
name: Sokol, O.
name: Krämer, M.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
Signatures of Jackiw-Rebbi resonance in the thermal conductance of topological Josephson junctions with magnetic islands
Creators: name: Gresta, Daniel
name: Blasi, Gianmichele
name: Taddei, Fabio
name: Carrega, Matteo
name: Braggio, Alessandro
name: Arrachea, Liliana
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Josephson junctions in two-dimensional topological insulators with embedded magnetic domains can host a number of topological phases, in particular, Jackiw-Rebbi solitons and Majorana zero modes. These different non-trivial phases appear in such junctions for multiple-domain magnetic islands, showing a rich multi-gap structure. Features related to the interplay between superconductivity and magnetism in these systems cannot be easily discerned looking at behavior of the Andreev spectrum and the concomitant dc Josephson effect. Instead, the thermal conductance is very sensitive to the nature of the junction and the domain structure of the magnetic island. We present a detailed analysis of these properties in the case of a topological Josephson junction with a single and two-domain magnetic island. Configurations hosting soliton magnetic modes lead to a peculiar behavior of the thermal conductance relative to the thermal quantum, characterized by a negative slope as a function of the temperature, just above the superconducting critical temperature. At low temperatures, these junctions also show characteristic coherence patters in the behavior of the thermal conductance as function of the Josephson phase bias and the angle between the magnetizations of the domains.
description: 13 pages with references, 11 figures, second version
Radon solubility in different types of tissue
Creators: name: Maier, A.
name: Van Beek, P.
name: Durante, M.
name: Fournier, C.
name: Hellmund, J.
name: Kraft, G.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
A note on Positivity of the CM line bundle
Creators: name: Fine, J.
name: Ross, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J10 (Primary) 14L24, 32Q20, 53C21 (Secondary)

description: We show that positivity of the CM line associated to a family of polarised varieties is intimately related to the stability of its members. We prove that the CM line is nef on any curve which meets the stable locus, and that it is pseudoeffective (i.e. in the closure of the effective cone) as long as there is at least one stable fibre. We give examples showing that the CM line can be strictly negative or strictly positive on curves in the unstable locus.
description: 10 pages; To appear in IMRN. Corrected typos and the statement of Thoerem 4.2 following referee's comments
Biodosimetry of alpha-particle-induced DNA double-strand breaks in murine bones and soft tissues
Creators: name: Steinlage, M.
name: Mirsch, J.
name: Schäfer, R.
name: Fournier, C.
name: Löbrich, M.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
Nordholt, Heinz-Hermann: Apartheid und reformierte Kirche
Creators: name: Becken, Hans-Jürgen
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 34 Nr. 3 (1985): Ökumenische Rundschau, Band 34, Heft 3
การประยุกต์ใช้ระบบการรับรองแบบมีส่วนร่วมเพื่อส่งเสริมการเกษตรอินทรีย์ภายในชุมชนเกษตรกรรายย่อย
Creators: name: ดุสิต อธินุวัฒน์
Publisher: name: Thammasat University
Year: 2019
Subjects: PGS organic lover group
Chum Ta Bong
PGS
organic farming folk way
guarantee by the community

description: Thai Journal of Science and Technology, 8, 5, 454-467
A Comprehensive Multi-Period Optimal Power Flow Framework for Smart LV Networks
Creators: name: Avramidis, Iason-Iraklis
name: Capitanescu, Florin
name: Deconinck, Geert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents an extensive multi-period optimal power flow framework, with new modelling elements, for smart LV distribution systems that rely on residential flexibility for combating operational issues. A detailed performance assessment of different setups is performed, including: ZIP flexible loads (FLs), varying degrees of controllability of conventional residential devices, such as electric vehicles (EVs) or photovoltaics (PVs), by the distribution system operator (DSO) (adhering to customer-dependent restrictions) and full exploitation of the capabilities offered by state-of-the-art inverter technologies. A comprehensive model-dependent impact assessment is performed, including phase imbalances, neutral and ground wires and load dependencies. The de-congestion potential of common residential devices is highlighted, analyzing capabilities such as active power redistribution, reactive power support and phase balancing. Said potential is explored on setups where the DSO can make only partial adjustments on customer profiles, rather than (as is common) deciding on the full profiles. The extensive analysis can be used by DSOs and researchers alike to make informed decisions on the required levels of modelling detail, the connected devices and the degrees of controlability. The formulation is computationally efficient, scaling well to medium-size systems, and can serve as an excellent basis for building more tractable or more targeted approaches.
A non-linear regulation of the antioxidative system in endothelial cells contributes to the anti-inflammatory effect of low dose X-irradiation
Creators: name: Large, M.
name: Hehlgans, S.
name: Fournier, C.
name: Rödel, C.
name: Rödel, F.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
Comparative studies on the effect of x-ray and heavy ion irradiation on ROS signalling and K$^+$ channel activation in A549 cells
Creators: name: Roth, B.
name: Gibhardt, C. S.
name: Jakob, B.
name: Fournier, C.
name: Thiel, G.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
The enigmatic B[e]-star Henize 2-90: The non-spherical mass loss history from an analysis of forbidden lines
Creators: name: Kraus, Michaela
name: Fernandes, Marcelo Borges
name: de Araujo, Francisco X.
name: Lamers, Henny J. G. L. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (abridged) We study the optical spectrum of the exciting B[e] star Hen 2-90 based on new high-resolution observations that cover the innermost 2". Our investigation is splitted in two parts, a qualitative study of the presence of the numerous emission lines and the classification of their line profiles which indicate a circumstellar environment of high complexity, and a quantitative analysis of numerous forbidden lines, e.g. [OI], [OII], [OIII], [SII], [SIII], [ArIII], [ClII], [ClIII] and [NII]. We find a correlation between the different ionization states of the elements and the velocities derived from the line profiles: the highly ionized atoms have the highest outflow velocity while the neutral lines have the lowest outflow velocity. The recent HST image of Hen 2-90 reveals a bipolar, highly ionized region, a neutral disk-like structure and an intermediate region of moderate ionization. It seems that a non-spherical stellar wind model is a good option to explain the ionization and spatial distribution of the circumstellar material. We modelled the forbidden lines under the assumption of a non-spherically symmetric wind based on the HST image. We find that in order to fit the observed line luminosities, the mass flux, surface temperature, and terminal wind velocities need to be latitude dependent, which might be explained in terms of a rapidly rotating central star. A rotation speed of 75-80 % of the critical velocity has been derived. The total mass loss rate of the star was determined to be of order 3 10^{-5} M_sun/yr. Such a wind scenario and the fact that compared to solar abundances C, O, and N seem to be underabundant while S, Ar and Cl have solar abundances, might be explained in terms of a rapidly rotating post-AGB star.
description: 16 pages, 13 figures, accepted for publication in A&A. Table 4 is included at the end of the paper. This table will only be available in the online version of the paper and will not appear in the printed version
A dimensionally reduced Gysin sequence for the equivariant Brauer group
Creators: name: Ratnam, Rishni Constantine
Publisher: name: The Australian National University
Year: 2010
Subjects: subject: QA612.R38 2010
subject: Finite groups
subject: Algebraic topology

description: In 2005 Bouwknegt, Hannabuss and Mathai constructed a "dimensionally reduced" Gysin sequence for de Rham cohomology using a Chern-Weil dimensional reduction isomorphism. This sequence was then used to propose a T-dual curvature class of a principal torus bundle equipped with an integral 3 cohomology class, called a H-flux. However, being a sequence for de Rham cohomology, it invariably omitted the phenomena of torsion. Somewhat earlier, in 1996, Packer, Raeburn and Williams, using the theory of group actions on continuous trace algebras, had written an integer cohomology Gysin sequence, that therefore includes torsion. However, this sequence is only able to compute the T-dual curvature class in the case where the projection of the H-flux to the E {u00B9} {u00B2}{u221E} term of the Leray-Serre spectral sequence is trivial. We generalise both of these results by constructing an integer cohomology Gysin sequence that applies to the case where the projection of the H-flux to the E {u2070} {u00B3}{u221E} term of the Leray-Serre spectral sequence is trivial. This subgroup is significant, as it describes precisely those H-fluxes that can be lifted to an element of the equivariant Brauer group. The construction utilises the groupoid cohomology of Tu and dimensional reduction isomorphisms for the equivariant Brauer group and integer {u010C}ech cohomology. From this point of view, the forgetful homomorphism appears as a connecting homomorphism in a long exact sequence.
Electrophysiological response of mouse embryonic stem cell-derived cardiomyocytes after X-ray and C-ion exposure
Creators: name: Helm, A.
name: Frank, S.
name: Frieß, J.
name: Thielemann, C.
name: Durante, M.
name: Ritter, S.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
МУРАККАБ СИНТАКТИК БИРЛИКЛАРНИНГ ТАРКИБИЙ ТУРЛАРИ ТЎҒРИСИДА
Creators: name: Жумаев, О.
Publisher: name: Zenodo
Year: 2024

description: Мураккаб синтактик бирликларнинг таркибий турлари нафақат кўпайиб боради, балки тўлдирилади, белгиланади ва кенгайтирилади. Таркибий турларни ўрнатишда янгидан ва янги тамойиллар ва белгилар қўлланилади. Бу мулоҳазани В.П. Луневанинг “О типологии сложного синтаксического целого”[1] асарини таҳлил қилиш орқали осонгина пайқаш мумкин.
Hyperasymptotic approximation to the plaquette and determination of the gluon condensate
Creators: name: Ayala, Cesar
name: Lobregat, Xabier
name: Pineda, Antonio
Publisher: name: arXiv
Year: 2020
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 give the hyperasymptotic expansion of the plaquette with a precision that includes the terminant associated to the leading renormalon. Subleading effects are also considered. The perturbative series is regulated using the principal value prescription for its Borel integral. We use this analysis to give a determination of the gluon condensate in SU(3) pure gluodynamics that is independent of the scale and renormalization scheme used for the coupling constant: $\langle G^2 \rangle_{\rm PV} (n_f=0)=3.15(18)\; r_0^{-4}$.
description: 20 pages, 9 figure. To meet journal version
Life in the dark : vision and navigation in a nocturnal bull ant
Creators: name: Reid, Samuel Francis
Publisher: name: The Australian National University
Year: 2010
Subjects: subject: QL568.F7 R45 2010
subject: Myrmecia Morphology
subject: Ants Behavior

description: While there are benefits associated with adopting a nocturnal lifestyle, there are also a number of challenges. For central place foragers, that are required to navigate to and from the nest, the challenge is the low light environment at night. As vision plays an essential role in navigation, central place foragers must be able to extract reliable navigational cues despite the extremely low ambient light levels. By studying the night-active bull ant Myrmecia pyriformis in its natural habitat, I show that the adaptations which allow for the transition from a diurnal to a nocturnal lifestyle do not simply involve any one behavioural or physiological characteristic, but are instead shared by every aspect of the ants' biology. The majority of activity to and from the nest is restricted to the dusk and dawn twilight, allowing foragers to navigate to and from the nest in sufficient light conditions. To ensure this occurs, foragers measure ambient light conditions and only begin activity when there is sufficient light. As foragers leave the nest, they are immediately oriented towards nearby Eucalyptus trees. By tracking individuals over many nights, I provide the first evidence that nocturnal ants form idiosyncratic routes. To do so, individuals rely on compass information provided by polarised skylight and the landmark panorama. Landmark guidance appears to be the primary mechanism of navigation, with foragers using landmark information from a variety of sources. As light levels fall, navigation suffers as landmark cues become harder to use; foragers become less directed, take longer to move between the nest and trees, walk more slowly, and stop for longer periods of time. Finally, when compared to day-active bull ants, the visual system of M. pyriformis is adapted to its night-active lifestyle via optical and physiological modifications which work to increase visual reliability in low light. As the majority of information on visual system adaptations to low light levels comes from work on nocturnal flying bees, studying the visual system of a nocturnal walking insect thus provides an interesting comparison which may be able to shed light on some of the fundamental questions relating to the costs and benefits of temporal niche partitioning.
Influence of layer defects on the damping in ferroelectric thin films
Creators: name: Wesselinowa, J. M.
name: Michael, T.
name: Trimper, S.
name: Zabrocki, K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A Green's function technique for a modified Ising model in a transverse field is applied, which allows to calculate the damping of the elementary excitations and the phase transition temperature of ferroelectric thin films with structural defects. Based on an analytical expression for the damping function, we analyze its dependence on temperature, film thickness and interaction strength numerically. The results demonstrate that defect layers in ferroelectric thin films, layers with impurities or vacancies as well as layers with dislocations are able to induce a strong increase of the damping due to different exchange interactions within the defect layers. The results are in good agreement with experimental data for thin ferroelectric films with different thickness.
description: 14 pages, 3 figures
Effect of Fasting on SARS-Cov-2 Infection Rate and Risks
Creators: name: Besharati, Mohammad Reza
name: Izadi, Mohammad
name: Alireza Talebpour
Publisher: name: Zenodo
Year: 2021
Subjects: Fasting, SARS-Cov-2, COVID-19, Iran, Fruits, Vegetables, families

description: Effect of Fasting on SARS-Cov-2 Infection Rate and Risks
Modeling time effects in the incidence of deterministic effects of radiation
Creators: name: Herr, L.
name: Friedrich, T.
name: Durante, M.
name: Scholz, M.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
МУРАККАБ СИНТАКТИК БИРЛИКЛАРНИНГ НАЗАРИЙ ЎЗГАРИШИ
Creators: name: Жумаев, О.
Publisher: name: Zenodo
Year: 2024

description: Мураккаб синтактик бирлик муаммоси кўплаб замонавий тилшунослар учун илмий-назарий жиҳатдан катта қизиқиш уйғотади. Бу қизиқиш, албатта, тасодифий эмас.
Suppression of surface-related loss in a gated semiconductor microcavity
Creators: name: Najer, Daniel
name: Tomm, Natasha
name: Javadi, Alisa
name: Korsch, Alexander R.
name: Petrak, Benjamin
name: Riedel, Daniel
name: Dolique, Vincent
name: Valentin, Sascha R.
name: Schott, Rüdiger
name: Wieck, Andreas D.
name: Ludwig, Arne
name: Warburton, Richard J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a surface passivation method that reduces surface-related losses by almost two orders of magnitude in a highly miniaturized GaAs open microcavity. The microcavity consists of a curved dielectric distributed Bragg reflector (DBR) with radius $\sim 10$ $μ$m paired with a GaAs-based heterostructure. The heterostructure consists of a semiconductor DBR followed by an n-i-p diode with a layer of quantum dots in the intrinsic region. Free-carrier absorption in the highly doped n- and p-layers is minimized by positioning them close to a node of the vacuum electromagnetic-field. The surface, however, resides at an anti-node of the vacuum field and results in significant loss. These losses are much reduced by surface passivation. The strong dependence on wavelength implies that the main effect of the surface passivation is to eliminate the surface electric field, thereby quenching below-bandgap absorption via a Franz-Keldysh-like effect. An additional benefit is that the surface passivation reduces scattering at the GaAs surface. These results are important in other nano-photonic devices which rely on a GaAs-vacuum interface to confine the electromagnetic field.
description: 11 pages, 8 figures
Critical parameters for the disorder-induced metal-insulator transition in FCC and BCC lattices
Creators: name: Eilmes, Andrzej
name: Fischer, Andrea M.
name: Römer, Rudolf A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We use a transfer-matrix method to study the disorder-induced metal-insulator transition. We take isotropic nearest- neighbor hopping and an onsite potential with uniformly distributed disorder. Following previous work done on the simple cubic lattice, we perform numerical calculations for the body centered cubic and face centered cubic lattices, which are more common in nature. We obtain the localization length from calculated Lyapunov exponents for different system sizes. This data is analyzed using finite-size scaling to find the critical parameters. We create an energy-disorder phase diagram for both lattice types, noting that it is symmetric about the band center for the body centered cubic lattice, but not for the face centered cubic lattice. We find a critical exponent of approximately 1.5-1.6 for both lattice types for transitions occurring either at fixed energy or at fixed disorder, agreeing with results previously obtained for other systems belonging to the same orthogonal universality class. We notice an increase in critical disorder with the number of nearest neighbors, which agrees with intuition.
description: 7 RevTex pages, 9 figures with 10 figure files included, submitted to Physical Review B
Graphene on two-dimensional hexagonal BN, AlN, and GaN: Electronic, spin-orbit, and spin relaxation properties
Creators: name: Zollner, Klaus
name: Cummings, Aron W.
name: Roche, Stephan
name: Fabian, Jaroslav
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the electronic structure of graphene on a series of 2D hexagonal nitride insulators hXN, X = B, Al, and Ga, with DFT calculations. A symmetry-based model Hamiltonian is employed to extract orbital parameters and spin-orbit coupling (SOC) from the low-energy Dirac bands of proximitized graphene. While commensurate hBN induces a staggered potential of about 10 meV into the Dirac bands, less lattice-matched hAlN and hGaN disrupt the Dirac point much less, giving a staggered gap below 100 $μ$eV. Proximitized intrinsic SOC surprisingly does not increase much above the pristine graphene value of 12 $μ$eV; it stays in the window of (1-16) $μ$eV, depending strongly on stacking. However, Rashba SOC increases sharply when increasing the atomic number of the boron group, with calculated maximal values of 8, 15, and 65 $μ$eV for B, Al, and Ga-based nitrides, respectively. The individual Rashba couplings also depend strongly on stacking, vanishing in symmetrically-sandwiched structures, and can be tuned by a transverse electric field. The extracted spin-orbit parameters were used as input for spin transport simulations based on Chebyshev expansion of the time-evolution of the spin expectation values, yielding interesting predictions for the electron spin relaxation. Spin lifetime magnitudes and anisotropies depend strongly on the specific (hXN)/graphene/hXN system, and they can be efficiently tuned by an applied external electric field as well as the carrier density in the graphene layer. A particularly interesting case for experiments is graphene/hGaN, in which the giant Rashba coupling is predicted to induce spin lifetimes of 1-10 ns, short enough to dominate over other mechanisms, and lead to the same spin relaxation anisotropy as observed in conventional semiconductor heterostructures: 50\%, meaning that out-of-plane spins relax twice as fast as in-plane spins.
description: 18 Pages, 12 Figures, 2 Tables
JIHP.pdf
Creators: name: Shishu Kesh Kumar
name: Das Ambika Bharti
Publisher: name: figshare
Year: 2021
Subjects: subject: 170106 Health, Clinical and Counselling Psychology
subject: FOS: Psychology
subject: Clinical Psychology
subject: 170103 Educational Psychology
subject: 111714 Mental Health
subject: FOS: Health sciences

description: This study intended to examine the role of proactive coping on psychological wellbeing of healthy youth in India. With General Health Questionnaire-12, 89 youth of age range 19-27 years were screened out as healthy. The final sample (N=89) comprised of 51 male (n1=51) and 38 female (n2=38) UG/PG students. Proactive Coping scale and Psychological Wellbeing assessment were used to assess proactive coping and psychological wellbeing respectively. With correlation and regression analysis the hypotheses of the study were tested. Proactive coping significantly positively associated with autonomy, personal growth, positive relation and purpose in life. Strategic planning significantly positively associated with only purpose in life. Preventive coping significantly positively associated with three dimensions of psychological wellbeing (autonomy, environmental mastery and purpose in life). Instrumental support significantly positively associated with positive relation and purpose in life. Emotional support seeking significantly positively associated with all dimensions of psychological wellbeing except autonomy and self-acceptance. However, avoidance coping significantly negatively associated with environmental mastery, purpose in life and self-acceptance. Proactive coping, emotional support seeking, avoidance coping and preventive coping emerged as significant predictors of various dimensions of psychological wellbeing. Proactive coping significantly associate and predicted various dimensions of psychological wellbeing.
Effects of short-term sub-lethal diazinon® exposure on behavioural patterns and respiratory function in Clarias batrachus: inferences for adaptive capacity in the wild
Creators: name: Saha, Shubhajit
name: Chukwuka, Azubuike V.
name: Mukherjee, Dip
name: Dhara, Kishore
name: Adeogun, Aina O.
name: Saha, Nimai Chandra
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Neuroscience
subject: Physiology
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy
subject: Plant Biology

description: The potentials for neurotoxicity and respiratory distress under 96 h acute diazinon exposures was examined using behavioural indices and opercular movement respectively in walking catfish, Clarias batrachus. Diazinon exposure concentrations were correlated with toxicological (lethal and sublethal) endpoints. The LC50 values and 95% confidence limits at 24, 48, 72 and 96 h, were 21.85 (19.09- 28.199 mg/L), 19.081 (17.15-21.65 mg/L), 16.07 (14.49- 17.86 mg/L) and 12.85 (10.92-14.39 mg/L) respectively. Concentration-dependent mortality and altered behavioural responses including uncoordinated swim movements, excessive mucus secretion, imbalanced and erratic swimming patterns and brief inactivity prior to mortality was observed. The altered behavioural patterns reflecting neurotoxicity, and increased opercular movement indicating respiratory distress in the catfish increased proportionally with elevated levels diazinon and exposure time. The inactive and almost non-motile state prior to death indicates paralysis and muscle seizure typical in the late stages of cholinergic toxicity. The severity of behavioural and respiratory effects on adult C. batrachus, a hardy species, portends catastrophic consequences for less hardy and more susceptible aquatic taxa like fish in the field, including considerable loss of adaptive ability.