cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Structure and magnetism of Cr2BP3O12: Towards the quantum-classical crossover in a spin-3/2 alternating chain
Creators: name: Janson, O.
name: Chen, S.
name: Tsirlin, A. A.
name: Hoffmann, S.
name: Sichelschmidt, J.
name: Huang, Q.
name: Zhang, Z. -J.
name: Tang, M. -B.
name: Zhao, J. -T.
name: Kniep, R.
name: Rosner, H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Magnetic properties of the spin-3/2 Heisenberg system Cr2BP3O12 are investigated by magnetic susceptibility chi(T) measurements, electron spin resonance, neutron diffraction, and density functional theory (DFT) calculations, as well as classical and quantum Monte Carlo (MC) simulations. The broad maximum of chi(T) at 85K and the antiferromagnetic Weiss temperature of 139 K indicate low-dimensional magnetic behavior. Below TN = 28 K, Cr2BP3O12 is antiferromagnetically ordered with the k = 0 propagation vector and an ordered moment of 2.5 muB/Cr. DFT calculations, including DFT+U and hybrid functionals, yield a microscopic model of spin chains with alternating nearest-neighbor couplings J1 and J1' . The chains are coupled by two inequivalent interchain exchanges of similar strength (~1-2 K), but different sign (antiferromagnetic and ferromagnetic). The resulting spin lattice is quasi-one-dimensional and not frustrated. Quantum MC simulations show excellent agreement with the experimental data for the parameters J1 ~= 50 K and J1'/J1 ~= 0.5. Therefore, Cr2BP3O12 is close to the gapless critical point (J1'/J1 = 0.41) of the spin-3/2 bond-alternating Heisenberg chain. The applicability limits of the classical approximation are addressed by quantum and classical MC simulations. Implications for a wide range of low-dimensional S = 3/2 materials are discussed.
description: Published version: 13 pages, 7 figures, 5 tables + Supplementary information
Social cohesion, structural holes, and a tale of two measures
Creators: name: Latora, Vito
name: Nicosia, Vincenzo
name: Panzarasa, Pietro
Publisher: name: arXiv
Year: 2012
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In the social sciences, the debate over the structural foundations of social capital has long vacillated between two positions on the relative benefits associated with two types of social structures: closed structures, rich in third-party relationships, and open structures, rich in structural holes and brokerage opportunities. In this paper, we engage with this debate by focusing on the measures typically used for formalising the two conceptions of social capital: clustering and effective size. We show that these two measures are simply two sides of the same coin, as they can be expressed one in terms of the other through a simple functional relation. Building on this relation, we then attempt to reconcile closed and open structures by proposing a new measure, Simmelian brokerage, that captures opportunities of brokerage between otherwise disconnected cohesive groups of contacts. Implications of our findings for research on social capital and complex networks are discussed.
description: 14 pages, 3 figures
Analysis of an exhaustive search algorithm in random graphs and the n^{c\log n} -asymptotics
Creators: name: Banderier, Cyril
name: Hwang, Hsien-Kuei
name: Ravelomanana, Vlady
name: Zacharovas, Vytas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: Discrete Mathematics (cs.DM)
subject: Data Structures and Algorithms (cs.DS)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05C80, 05C85 (Primary) 65Q30 (Secondary)

description: We analyze the cost used by a naive exhaustive search algorithm for finding a maximum independent set in random graphs under the usual G_{n,p} -model where each possible edge appears independently with the same probability p. The expected cost turns out to be of the less common asymptotic order n^{c\log n}, which we explore from several different perspectives. Also we collect many instances where such an order appears, from algorithmics to analysis, from probability to algebra. The limiting distribution of the cost required by the algorithm under a purely idealized random model is proved to be normal. The approach we develop is of some generality and is amenable for other graph algorithms.
description: 35 pages
Hierarchical Learning Algorithm for the Beta Basis Function Neural Network
Creators: name: Dhahri, Habib
name: Alimi, Mohamed Adel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The paper presents a two-level learning method for the design of the Beta Basis Function Neural Network BBFNN. A Genetic Algorithm is employed at the upper level to construct BBFNN, while the key learning parameters :the width, the centers and the Beta form are optimised using the gradient algorithm at the lower level. In order to demonstrate the effectiveness of this hierarchical learning algorithm HLABBFNN, we need to validate our algorithm for the approximation of non-linear function.
КОРПОРАТИВ ШАРТНОМА ТАРАФЛАРНИНГ ҲУҚУҚЛАРИНИ ҲИМОЯ ҚИЛИШНИ ТАКОМИЛЛАШТИРИШ
Creators: name: Казакбаев, Туелбай
Publisher: name: Zenodo
Year: 2023

description: Мақолада корпоратив шартнома тарафларининг ҳуқуқлари ва уларни ҳимоя қилиш усуллари ҳамда воситалари ҳаққида маълумот берилган, шунингдек корпоратив шартнома тарафларининг ҳуқуқларини химоя қилишни такомиллаштириш масалаларига тохталиб ўтилган.
First Stars IV: Summary Talk
Creators: name: Ferrara, Andrea
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The paper contains the summary of the First Stars IV 2012 Conference held in Kyoto, Japan
description: Summary Talk of the First Stars IV 2012 Conference held in Kyoto, Japan
title: Stream sediment geochemistry of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand
Creators: name: Christie, A. B..
name: Carver, R
Publisher: name: GNS Science
Year: 2023

description: Results of mining company stream-sediment geochemical surveys in the Hauraki Goldfield have been compiled in the REGCHEM (Regional Exploration Geochemistry) database, managed by GNS Science. The Hauraki Goldfield dataset contains analyses for 11,127fine-fraction stream sediments, 568 pan concentrates and 1437 BLEG (bulk leach extractible gold) samples from 70 surveys carried out between 1968 and 1991, the main period of modern reconnaissance exploration in the goldfield. The stream-sediment samples were typically analysed for Au and As, and in many cases for other elements, including Ag, Cu, Pb, Zn, Sb and Mo. The BLEG samples were analysed for Au and in some cases also for Ag. The main exploration target was epithermal Au-Ag deposits associated with Miocene to Pliocene volcanism of the Coromandel Volcanic Zone. A secondary target was sub-volcanic porphyry Cu-Au deposits. A large number of geochemical anomalies were identified in this study, and, in particular, there are prominent areas of elevated Cu, Pb and Zn on the western side of the goldfield where there are deeper levels of erosion. This erosion exposes the deep base-metal style of epithermal mineralisation and several porphyry Cu occurrences. Background populations of some elements exhibit different threshold concentrations for the main geological units of greywacke, andesite (and dacite) and rhyolite
The study of quark-gluon matter in high-energy nucleus-nucleus collisions
Creators: name: Andronic, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A short overview is given on the study of hot matter produced in relativistic nucleus-nucleus collisions, with emphasis on recent measurements at the LHC.
description: 10 pages, 5 figures; writeup of a lecture given at the Carpathian Summer School of Physics 2012, Sinaia, Romania
Realization of 2-channel Kondo effect in a junction of three quantum Ising chains
Creators: name: Tsvelik, A. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: It is shown that a junction of three quantum Ising chains ($Δ$-junction) can be described as the 2-channel Kondo model in a box which size is of the order of the Ising model correlation length with spin S=1/2 localized at the junction. The local spin is composed of the zero energy boundary Majorana modes of the Ising models.
description: 3 pages, a rigorous derivation of the link between the Ising chains and the Kondo model is provided
Flux density variations of radio sources in M82 over the last 3 decades
Creators: name: Gendre, M. A.
name: Fenech, D. M.
name: Beswick, R. J.
name: Muxlow, T. W. B.
name: Argo, M. K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: This paper presents the results of the 2009-2010 monitoring sessions of the starburst galaxy M82, obtained with the Multi-Element Radio-Linked Interferometer Network (MERLIN) at 5GHz and e-MERLIN at 6GHz. Combining several 5GHz MERLIN epochs to form a map with 33.0 uJy/bm noise level, 52 discrete sources, mostly supernova remnants and HII regions, are identified. These include three objects which were not detected in the 2002 5GHz MERLIN monitoring session: supernova SN2008iz, the transient source 43.78+59.3, and a new supernova remnant shell. Flux density variations, in the long (1981 to 2010), medium (2002 to 2010) and short (2009 to 2010) term, are investigated. We find that flux densities of SNRs in M82 stay constant in most of the sample (~95%). In addition, aside from SN2008iz and the well-known variable source 41.95+57.5, two sources display short and medium term variations over the period 2009-2010. These sources being among the most compact SNR in M82, these flux density variations could be due to changes in the circumstellar and interstellar medium in which the shocks travel.
description: 15 pages, 10 figures
A method of encoding generalized link diagrams
Creators: name: Musick, Chad
Publisher: name: arXiv
Year: 2012
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25

description: We describe a method of encoding various types of link diagrams, including those with classical, flat, rigid, welded, and virtual crossings. We show that this method may be used to encode link diagrams, up to equivalence, in a notation whose length is a cubic function of the number of 'riser marks'. For classical knots, the minimal number of such marks is twice the bridge index, and a classical knot diagram in minimal bridge form with bridge index $b$ may be encoded in space $\mathcal{O}(b^2)$. A set of moves on the notation is defined. As a demonstration of the utility of the notation we give another proof that the Kishino virtual knot is non-classical.
description: 17 pages, 13 figures; to appear in the Journal of Knot Theory & Its Ramifications
Ion-laser interactions: The most complete solution
Creators: name: Moya-Cessa, Héctor
name: Soto-Eguibar, Francisco
name: Vargas-Martínez, José M.
name: Juárez-Amaro, Raúl
name: Zúñiga-Segundo, Arturo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Trapped ions are considered one of the best candidates to perform quantum information processing. By interacting them with laser beams they are, somehow, easy to manipulate, which makes them an excellent choice for the production of nonclassical states of their vibrational motion, the reconstruction of quasiprobability distribution functions, the production of quantum gates, etc. However, most of these effects have been produced in the so-called low intensity regime, this is, when the Rabi frequency is much smaller than the trap frequency. Because of the possibility to produce faster quantum gates in other regimes it is of importance to study this system in a more complete manner, which is the motivation for this contribution. We start by studying the way ions are trapped in Paul traps in and review the basic mechanisms of trapping. Then we show how the problem may be completely solved for trapping states; i.e., we find eigenstates of the full Hamiltonian. We show how in the low intensity regime Jaynes-Cummings and anti-Jaynes-Cummings interactions may be obtained, without using the rotating wave approximation and analyze the medium and high intensity regimes were dispersive Hamiltonians are produced. The traditional approach is also studied and used for the generation of non-classical states of the vibrational of the vibrational wavefunction. In particular, we show how to add and subtract vibrational quanta to an initial state, how to produce specific superpositions of number states and how to generate NOON states for the two-dimensional vibration of the ion. It is also shown how squeezing may be measured. The time dependent problem is studied by using Lewis-Ermakov methods, we give a solution to the problem when the time dependence of the trap is considered and also analyze an specific time dependence that produces squeezing of the initial vibrational wave function.
description: 42 pages, 15 figures
Reconstructing three-dimensional parameters of galaxy clusters via multifrequency SZ observations
Creators: name: Morandi, Andrea
name: Nagai, Daisuke
name: Cui, Wei
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Sunyaev-Zeldovich (SZ) effect is a promising tool to study physical properties of the hot X-ray emitting intracluster medium (ICM) in galaxy clusters. To date, most SZ observations have been interpreted in combination with X-ray follow-up measurements in order to determine the ICM temperature and estimate the cluster mass. Future high-resolution, multifrequency SZ observations promise to enable detailed studies of the ICM structures, by measuring the ICM temperature through the temperature-dependent relativistic corrections. In this work we develop a non-parametric method to derive three-dimensional physical quantities, including temperature, pressure, total mass, and peculiar velocities, of galaxy clusters from SZ observations alone. We test the performance of this method using hydrodynamical simulations of galaxy clusters, in order to assess systematic uncertainties in the reconstructed physical parameters. In particular, we analyze mock Cerro Chajnantor Atacama Telescope (CCAT) SZ observations, taking into account various sources of systematic uncertainties associated with instrumental effects and astrophysical foregrounds. We show that our method enables accurate reconstruction of the three-dimensional ICM profiles, while retaining full information about the gas distribution. We discuss the application of this technique for ongoing and future multifrequency SZ observations.
description: MNRAS in press
Fusion excitation function revisited
Creators: name: Eudes, Ph.
name: Basrak, Z.
name: Sébille, F.
name: de la Mota, V.
name: Royer, G.
name: Zorić, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report on a comprehensive systematics of fusion-evaporation and/or fusion-fission cross sections for a very large variety of systems over an energy range 4-155 A.MeV. Scaled by the reaction cross sections, fusion cross sections do not show a universal behavior valid for all systems although a high degree of correlation is present when data are ordered by the system mass asymmetry.For the rather light and close to mass-symmetric systems the main characteristics of the complete and incomplete fusion excitation functions can be precisely determined. Despite an evident lack of data above 15A.MeV for all heavy systems the available data suggests that geometrical effects could explain the persistence of incomplete fusion at incident energies as high as 155A.MeV.
description: 8 pages, 5 figures, contribution to the NN2012 Proceedings
Search for supersymmetry in events with b-quark jets and missing transverse energy in pp collisions at 7 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Results are presented from a search for physics beyond the standard model based on events with large missing transverse energy, at least three jets, and at least one, two, or three b-quark jets. The study is performed using a sample of proton-proton collision data collected at sqrt(s) = 7 TeV with the CMS detector at the LHC in 2011. The integrated luminosity of the sample is 4.98 inverse femtobarns. The observed number of events is found to be consistent with the standard model expectation, which is evaluated using control samples in the data. The results are used to constrain cross sections for the production of supersymmetric particles decaying to b-quark-enriched final states in the context of simplified model spectra.
description: Submitted to Physical Review D
High-dynamic-range extinction mapping of infrared dark clouds: Dependence of density variance with sonic Mach number in molecular clouds
Creators: name: Kainulainen, Jouni
name: Tan, Jonathan C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Measuring the mass distribution of infrared dark clouds (IRDCs) over the wide dynamic range of their column densities is a fundamental obstacle in determining the initial conditions of high-mass star formation and star cluster formation. We present a new technique to derive high-dynamic-range, arcsecond-scale resolution column density data for IRDCs and demonstrate the potential of such data in measuring the density variance - sonic Mach number relation in molecular clouds. We combine near-infrared data from the UKIDSS/Galactic Plane Survey with mid-infrared data from the Spitzer/GLIMPSE survey to derive dust extinction maps for a sample of ten IRDCs. We then examine the linewidths of the IRDCs using 13CO line emission data from the FCRAO/Galactic Ring Survey and derive a column density - sonic Mach number relation for them. For comparison, we also examine the relation in a sample of nearby molecular clouds. The presented column density mapping technique provides a very capable, temperature independent tool for mapping IRDCs over the column density range equivalent to A_V=1-100 mag at a resolution of 2". Using the data provided by the technique, we present the first direct measurement of the relationship between the column density dispersion, σ_{N/}, and sonic Mach number, M_s, in molecular clouds. We detect correlation between the variables with about 3-sigma confidence. We derive the relation σ_{N/} = (0.047 \pm 0.016) Ms, which is suggestive of the correlation coefficient between the volume density and sonic Mach number, σ_{ρ/} = (0.20^{+0.37}_{-0.22}) Ms, in which the quoted uncertainties indicate the 3-sigma range. When coupled with the results of recent numerical works, the existence of the correlation supports the picture of weak correlation between the magnetic field strength and density in molecular clouds (i.e., B ~ ρ^{0.5}).
description: Accepted for publication in A&A. 29 pages. Download the version with full-resolution figures from http://www.mpia-hd.mpg.de/homes/jtkainul/NexusI/PaperII_arxiv.pdf.gz
Properties of branching exponential flights in bounded domains
Creators: name: Zoia, Andrea
name: Dumonteil, Eric
name: Mazzolo, Alain
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Branching random flights are key to describing the evolution of many physical and biological systems, ranging from neutron multiplication to gene mutations. When their paths evolve in bounded regions, we establish a relation between the properties of trajectories starting on the boundary and those starting inside the domain. Within this context, we show that the total length travelled by the walker and the number of performed collisions in bounded volumes can be assessed by resorting to the Feynman-Kac formalism. Other physical observables related to the branching trajectories, such as the survival and escape probability, are derived as well.
description: 5 pages, 2 figures
Theories of Linear Response in BCS Superfluids and How They Meet Fundamental Constraints
Creators: name: Guo, Hao
name: Chien, Chih-Chun
name: He, Yan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We address the importance of symmetry and symmetry breaking on linear response theories of fermionic BCS superfluids. The linear theory of a noninteracting Fermi gas is reviewed and several consistency constraints are verified. The challenge to formulate linear response theories of BCS superfluids consistent with density and spin conservation laws comes from the presence of a broken U(1)$_{\textrm{EM}}$ symmetry associated with electromagnetism (EM) and we discuss two routes for circumventing this. The first route follows Nambu's integral-equation approach for the EM vertex function, but this method is not specific for BCS superfluids. We focus on the second route based on a consistent-fluctuation-of-the order-parameter (CFOP) approach where the gauge transformation and the fluctuations of the order parameter are treated on equal footing. The CFOP approach allows one to explicitly verify several important constraints: The EM vertex satisfies not only a Ward identity which guarantees charge conservation but also a $Q$-limit Ward identity associated with the compressibility sum rule. In contrast, the spin degrees of freedom associated with another U(1)$_z$ symmetry are not affected by the Cooper-pair condensation that breaks only the U(1)$_{\textrm{EM}}$ symmetry. As a consequence the collective modes from the fluctuations of the order parameter only couple to the density response function but decouple from the spin response function, which reflects the different fates of the two U(1) symmetries in the superfluid phase. Our formulation lays the ground work for application to more general theories of BCS-Bose Einstein Condensation crossover both above and below $T_c$.
description: Review on gauge invariance and charge-spin difference of BCS theory. 27 pages, 1 figure. Some typos have been corrected
Ground state solutions for nonlinear fractional Schrödinger equations in $\mathbb{R}^N$
Creators: name: Secchi, Simone
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q55, 35A15, 35J20

description: We construct solutions to a class of Schrödinger equations involving the fractional laplacian. Our approach is variational in nature, and based on minimization on the Nehari manifold.
description: 17 pages
Vulnerability Management for an Enterprise Resource Planning System
Creators: name: Goel, Shivani
name: Kiran, Ravi
name: Garg, Deepak
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: Enterprise resource planning (ERP) systems are commonly used in technical educational institutions(TEIs). ERP systems should continue providing services to its users irrespective of the level of failure. There could be many types of failures in the ERP systems. There are different types of measures or characteristics that can be defined for ERP systems to handle the levels of failure. Here in this paper, various types of failure levels are identified along with various characteristics which are concerned with those failures. The relation between all these is summarized. The disruptions causing vulnerabilities in TEIs are identified .A vulnerability management cycle has been suggested along with many commercial and open source vulnerability management tools. The paper also highlights the importance of resiliency in ERP systems in TEIs.
Energy eigenfunctions of the 1D Gross-Pitaevskii equation
Creators: name: Marojević, Želimir
name: Göklü, Ertan
name: Lämmerzahl, Claus
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We developed a new and powerful algorithm by which numerical solutions for excited states in a gravito optical surface trap have been obtained. They represent solutions in the regime of strong nonlinearities of the Gross--Pitaevskii equation. In this context we also shortly review several approaches which allow, in principle, for calculating excited state solutions. It turns out that without modifications these are not applicable to strongly nonlinear Gross-Pitaevskii equations. The importance of studying excited states of Bose-Einstein condensates is also underlined by a recent experiment of Bücker et al in which vibrational state inversion of a Bose-Einstein condensate has been achieved by transferring the entire population of the condensate to the first excited state. Here, we focus on demonstrating the applicability of our algorithm for three different potentials by means of numerical results for the energy eigenstates and eigenvalues of the 1D Grosss-Pitaevskii-equation. We compare the numerically found solutions and find out that they completely agree with the case of known analytical solutions.
description: 18 pages, 11 figures
T-Cyg1-12664: A low-mass chromospherically active eclipsing binary in the Kepler field
Creators: name: Cakirli, O.
name: Ibanoglu, C.
name: Sipahi, E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The eclipsing binary T-Cyg1-12664 was observed both spectroscopically and photometrically. Radial velocities of both components and ground-based VRI light curves were obtained. The Kepler's R-data and radial velocities for the system were analysed simultaneously. Masses and radii were obtained as 0.680$\pm$0.021 M$_{\odot}$ and 0.613$\pm$0.007 R$_{\odot}$for the primary and 0.341$\pm$0.012M$_{\odot}$ and 0.897$\pm$0.012R$_{\odot}$ for the secondary star. The distance to the system was estimated as 127$\pm$14 pc. The observed wave-like distortion at out-of-eclipse is modeled with two separate spots on the more massive star, which is also confirmed by the Ca {\sc ii} K and H emission lines in its spectra. Locations of the components in the mass-radius and mass-effective temperature planes were compared with the well-determined eclipsing binaries' low-mass components as well as with the theoretical models. While the primary star's radius is consistent with the main-sequence stars, the radius of the less massive component appears to be 2.8 times larger than that of the main-sequence models. Comparison of the radii of low-mass stars with the models reveals that the observationally determined radii begin to deviate from the models with a mass of 0.27 \Msun and suddenly reaches to maximum deviation at a mass of 0.34 \Msun. Then, the deviations begin to decrease up to the solar mass. The maximum deviation seen at a mass of about 0.34 \Msun is very close to the mass of fully convective stars as suggested by theoretical studies. A third star in the direction of the eclipsing pair has been detected from our VRI images. The observed infrared excess of the binary is most probably arisen from this star which may be radiated mostly in the infrared bands.
description: Accepted in MNRAS, 25 pages, 10 figures. arXiv admin note: text overlap with arXiv:1007.5138
Klaus Malettke, Frankreich, Deutschland und Europa im 17. und 18. Jahrhundert. Beiträge zum Einfluß französischer politischer Theorie, Verfassung und Außenpolitik in der Frühen Neuzeit, 1994
Creators: name: Bély, Lucien
Publisher: name: Francia
Year: 2019

description: -
description: Francia, Bd. 25 Nr. 2 (1998)
Titelei
Creators: name: Redaktion, Die
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: -
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 67 Nr. 2 (1989)
Komplizierte Klangkörper
Creators: name: Opel, Sophia
Publisher: name: KulturGut : aus der Forschung des Germanischen Nationalmuseums
Year: 2019

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 61 (2019): KulturGut: aus der Forschung des Germanischen Nationalmuseums
Ein Kerzenbaum
Creators: name: Becker, Kristin
Publisher: name: KulturGut : aus der Forschung des Germanischen Nationalmuseums
Year: 2019

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 61 (2019): KulturGut: aus der Forschung des Germanischen Nationalmuseums
Estimation of the Efficiency of Material Injection into the Reflex Discharge by Sputtering the Cathode Material
Creators: name: Kovtun, Yu. V.
name: Skibenko, E. I.
name: Skibenko, A. I.
name: Yuferov, V. B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The processes of injection of a sputtered-and-ionized working material into the pulsed reflex discharge plasma have been considered at the initial stage of dense gas-metal plasma formation. A calculation model has been proposed to estimate the parameters of the sputtering mechanism for the required working material to be injected into the discharge. The data obtained are in good accordance with experimental results.
description: 8 pages, 7 figures
Inhalt II. Quartal 2019 / Aktuelle Ausstellungen / Impressum
Creators: name: Redaktion, Die
Publisher: name: KulturGut : aus der Forschung des Germanischen Nationalmuseums
Year: 2019

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 61 (2019): KulturGut: aus der Forschung des Germanischen Nationalmuseums
Polymer quantization and Symmetries
Creators: name: Date, Ghanashyam
name: Kajuri, Nirmalya
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Polymer quantization was discovered during the construction of Loop Quantum Cosmology. For the simplest quantum theory of one degree of freedom, the implications for dynamics were studied for the harmonic oscillator as well as some other potentials. For more degrees of freedom, the possibility of continuous, kinematic symmetries arises. While these are realised on the Hilbert space of polymer quantum mechanics, their infinitesimal versions are not supported. For an invariant Hamiltonian, these symmetry realizations imply infinite degeneracy suggesting that the symmetry should be spontaneously or explicitly broken. The estimation of symmetry violations in some cases have been analysed before. Here we explore the alternative of shifting the arena to the distributional states. We discuss both the polymer quantum mechanics case as well as polymer quantized scalar field.
description: 20 pages, version 2, added further explanations and references. Results and conclusions unchanged. Version to appear in CQG
Ein spätbronzezeitlicher Bildstein in Gerkenhof, Gem. Schafwinkel, Kr. Verden?
Creators: name: Schünemann, Detlef
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 35 (1966): Nachrichten aus Niedersachsens Urgeschichte
One-loop four-graviton amplitudes in N=4 supergravity models
Creators: name: Tourkine, Piotr
name: Vanhove, Pierre
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We evaluate in great detail one-loop four-graviton field theory amplitudes in pure N=4 D=4 supergravity. The expressions are obtained by taking the field theory limits of (4,0) and (2,2) space-time supersymmetric string theory models. For each model we extract the contributions of the spin-1 and spin-2 N=4 supermultiplets running in the loop. We show that all of those constructions lead to the same four-dimensional result for the four-graviton amplitudes in pure supergravity even though they come from different string theory models.
description: 46 pages. One figure. v2: minor corrections and clarifications. References added. v3: (2,2) analysis corrected, four-graviton amplitudes found to be indentical in all models. Various clarifications and precisions added. References list updated. v4: Assorted spelling and grammar corrections. Version to be published
Small-scale structure in the interstellar medium: time-varying interstellar absorption towards κ Velorum
Creators: name: Smith, Keith T.
name: Fossey, Stephen J.
name: Cordiner, Martin A.
name: Sarre, Peter J.
name: Smith, Arfon M.
name: Bell, Tom A.
name: Viti, Serena
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Ultra-high spectral resolution observations of time-varying interstellar absorption towards κ Vel are reported, using the Ultra-High Resolution Facility on the Anglo-Australian Telescope. Detections of interstellar Ca I, Ca II, K I, Na I and CH are obtained, whilst an upper limit on the column density is reported for C_2. The results show continued increases in column densities of K I and Ca I since observations ~ 4 yr earlier, as the transverse motion of the star carried it ~ 10 AU perpendicular to the line of sight. Line profile models are fitted to the spectra and two main narrow components (A & B) are identified for all species except CH. The column density N(K I) is found to have increased by 82 +10-9 % between 1994 and 2006, whilst N(Ca I) is found to have increased by 32 +- 5 % over the shorter period of 2002-2006. The line widths are used to constrain the kinetic temperature to T_k,A < 671 +18-17 K and T_k,B < 114 +15-14 K. Electron densities are determined from the Ca I / Ca II ratio, which in turn place lower limits on the total number density of n_A > 7 * 10^3 cm^-3 and n_B > 2 * 10^4 cm^-3. Calcium depletions are estimated from the Ca I / K I ratio. Comparison with the chemical models of Bell et al. (2005) confirms the high number density, with n = 5 * 10^4 cm^-3 for the best-fitting model. The first measurements of diffuse interstellar bands (DIBs) towards this star are made at two epochs, but only an upper limit of < 40 % is placed on their variation over ~ 9 years. The DIBs are unusually weak for the measured E(B-V) and appear to exhibit similar behaviour to that seen in Orion. The ratio of equivalent widths of the λ5780 to λ5797 DIBs is amongst the highest known, which may indicate that the carrier of λ5797 is more sensitive to UV radiation than to local density.
description: 17 pages, 11 figures, 4 tables. Accepted for publication in MNRAS
Probing nuclear matter with jets
Creators: name: Zhang, Ben-Wei
name: He, Yuncun
name: Neufeld, R. B.
name: Vitev, Ivan
name: Wang, Enke
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Jet physics in relativistic heavy ion collisions, which combines perturbative QCD jet production with quark and gluon energy loss and in-medium parton shower modification, has emerged as a powerful tool to probe the properties of strongly-interacting matter formed in high-energy nuclear reactions. We present selected results for the modification of jet cross sections and related observables in the ambiance of hot and/or dense nuclear medium. We focus on the inclusive jet spectrum and dijets [${\cal O}(α_s^3) $], and $Z^0/γ^*$ tagged jets [${\cal O}(G_Fα_s^2) $] in the framework of perturbative QCD.
description: talk given at the 5th international conference on Hard and Electromagnetic Probes of High Energy nuclear Collisions (Hard Probes 2012), May 27th - June 1st, Caglirai (Italy), 4 pages, 4 figures
Comparative Analysis of dynamic graph techniques and data strucutre
Creators: name: Tyagi, Megha
name: Garg, Deepak
Publisher: name: arXiv
Year: 2012
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: Dynamically changing graphs are used in many applications of graph algorithms. The scope of these graphs are in graphics, communication networks and in VLSI designs where graphs are subjected to change, such as addition and deletion of edges and vertices. There is a rich body of the algorithms and data structures used for dynamic graphs. The paper overview the techniques and data structures used in various dynamic algorithms. The effort is tried to find out the comparison in these techniques namely the hierarchical decomposition of graphs and highlighting the ingenuity used in designing these algorithms.
Chaos-driven dynamics in spin-orbit coupled atomic gases
Creators: name: Larson, Jonas
name: Anderson, Brandon
name: Altland, Alexander
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: The dynamics, appearing after a quantum quench, of a trapped, spin-orbit coupled, dilute atomic gas is studied. The characteristics of the evolution is greatly influenced by the symmetries of the system, and we especially compare evolution for an isotropic Rashba coupling and for an anisotropic spin-orbit coupling. As we make the spin-orbit coupling anisotropic, we break the rotational symmetry and the underlying classical model becomes chaotic; the quantum dynamics is affected accordingly. Within experimentally relevant time-scales and parameters, the system thermalizes in a quantum sense. The corresponding equilibration time is found to agree with the Ehrenfest time, i.e. we numerically verify a ~log(1/h) scaling. Upon thermalization, we find the equilibrated distributions show examples of quantum scars distinguished by accumulation of atomic density for certain energies. At shorter time-scales we discuss non-adiabatic effects deriving from the spin-orbit coupled induced Dirac point. In the vicinity of the Dirac point, spin fluctuations are large and, even at short times, a semi-classical analysis fails.
description: 11 pages, 10 figures
On multidimensional generalized Cramér-Rao inequalities, uncertainty relations and characterizations of generalized $q$-Gaussian distributions
Creators: name: Bercher, J. -F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: 28D20, 94A17, 62B10, 39B62

description: In the present work, we show how the generalized Cramér-Rao inequality for the estimation of a parameter, presented in a recent paper, can be extended to the mutidimensional case with general norms on $\mathbb{R}^{n}$, and to a wider context. As a particular case, we obtain a new multidimensional Cramér-Rao inequality which is saturated by generalized $q$-Gaussian distributions. We also give another related Cramér-Rao inequality, for a general norm, which is saturated as well by these distributions. Finally, we derive uncertainty relations from these Cramér-Rao inequalities. These uncertainty relations involve moments computed with respect to escort distributions, and we show that some of these relations are saturated by generalized $q$-Gaussian distributions. These results introduce extended versions of Fisher information, new Cramér-Rao inequalities, and new characterizations of generalized $q$-Gaussian distributions which are important in several areas of physics and mathematics.
New photometric investigation of the double ringed galaxy ESO474-G26. Unveiling the formation scenario
Creators: name: Spavone, M.
name: Iodice, E.
name: Bettoni, D.
name: Galletta, G.
name: Mazzei, P.
name: Reshetnikov, V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a detailed photometric study of the peculiar double ringed galaxy ESO474-G26. Near-Infrared (NIR) and optical data have been used, with the main goal to constrain the formation history of ESO474-G26. NIR photometry is fundamental in this kind of study, because gives better constraints on the Spectral Energy Distribution (SED) and well traces the older stellar population of the galaxy. This galaxy presents a very complex structure, with two almost orthogonal rings, one in the equatorial and another in the polar plane, around an elliptical-like object. Due to the peculiar morphology of ESO474-G26, we used both NIR images (J and K bands) to derive accurate analysis of the stellar light distribution, and optical images (in the B, V and R bands) to derive color profiles and color maps to study the structure of the rings. The observational characteristic of ESO474-G26 are typical of galaxies which have experienced some kind of interactions during their evolution. We investigated two alternatives: a merging process and an accretion event.
description: 19 pages, 20 figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS)
Palladium catalysed C(sp3)–H functionalisation of aldehydes and amines using transient imine directing groups
Creators: name: St John-Campbell, Sahra
Publisher: name: Imperial College London
Year: 2018

description: Transition metal catalysed C–H functionalisation can enable more straightforward routes to small molecules by installing new C–C or C–X bonds in place of existing C–H bonds. C(sp3)⁠ H functionalisation is a particular challenge, and typically requires the presence of amide bound directing groups with distinct installation and removal steps, reducing efficiency. Transient directing groups bind to the substrate reversibly, facilitating directing group installation, C–H functionalisation and directing group removal, tracelessly and in one-pot. This thesis will describe the development of novel transient imine directing groups for the functionalisation of both aldehydes and amines. Section 3.1 describes the development of a direct β-C(sp3)–H arylation of tertiary aldehydes. Catalytic N-tosylethylenediamine was the optimal transient directing group for the arylation, however a large range of alternative amines were explored. Numerous aryl iodides and aldehydes could be used to form the products in good yields. The transient imine mechanism was supported through NMR studies and the isolation of an underivatised palladacycle. Section 3.2 explains methylene C–H arylation of secondary aliphatic aldehydes. Milder reaction conditions and β-aniline amide directing groups, which provided chelation through the carbonyl oxygen in a 6-membered palladacycle, provided the best results. The structures of the transient imino-amide directing groups were explored and compared with the parent acid. In Section 3.3, the first transient directing group promoted intramolecular C(sp3)–H annulation reaction was developed, using an amino-ether TDG. This is the only example of oxidative addition of a less reactive C–Br bond (vs C–I) using this approach. Section 3.4 describes applying ‘reverse’ transient imines for amine functionalisation. A simple aliphatic aldehyde was designed and developed, derived from an acetal precursor, that promotes selective γ-C(sp3)–H arylation of unprotected primary amines. Detailed mechanistic studies have been conducted to provide insight on the dual catalytic cycle.
Inner Ideals of Simple Locally Finite Lie Algebras
Creators: name: Baranov, Alexander
name: Rowley, Jamie
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 17B65

description: Inner ideals of simple locally finite dimensional Lie algebras over an algebraically closed field of characteristic 0 are described. In particular, it is shown that a simple locally finite dimensional Lie algebra has a non-zero proper inner ideal if and only if it is of diagonal type. Regular inner ideals of diagonal type Lie algebras are characterized in terms of left and right ideals of the enveloping algebra. Regular inner ideals of finitary simple Lie algebras are described.
Non-linear (loop) quantum cosmology
Creators: name: Bojowald, Martin
name: Chinchilli, Alexander L.
name: Dantas, Christine C.
name: Jaffe, Matthew
name: Simpson, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Inhomogeneous quantum cosmology is modeled as a dynamical system of discrete patches, whose interacting many-body equations can be mapped to a non-linear minisuperspace equation by methods analogous to Bose-Einstein condensation. Complicated gravitational dynamics can therefore be described by more-manageable equations for finitely many degrees of freedom, for which powerful solution procedures are available, including effective equations. The specific form of non-linear and non-local equations suggests new questions for mathematical and computational investigations, and general properties of non-linear wave equations lead to several new options for physical effects and tests of the consistency of loop quantum gravity. In particular, our quantum cosmological methods show how sizeable quantum corrections in a low-curvature universe can arise from tiny local contributions adding up coherently in large regions.
description: 20 pages
The origin of Raman D Band: Bonding and Antibonding Orbitals in Graphene
Creators: name: Sasaki, Ken-ichi
name: Tokura, Yasuhiro
name: Sogawa, Tetsuomi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In Raman spectroscopy of graphite and graphene, the $D$ band at $\sim 1355$cm$^{-1}$ is used as the indication of the dirtiness of a sample. However, our analysis suggests that the physics behind the $D$ band is closely related to a very clear idea for describing a molecule, namely bonding and antibonding orbitals in graphene. In this paper, we review our recent work on the mechanism for activating the $D$ band at a graphene edge.
description: 21 pages, 7 figures
Phenomenology of the Interplay between IR-Improved DGLAP-CS Theory and NLO ME Matched Parton Shower MC Precision
Creators: name: Majhi, S. K.
name: Mukhopadhyay, A.
name: Ward, B. F. L.
name: Yost, S. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present the current status of the application of our approach of {\it exact} amplitude-based resummation in quantum field theory to precision QCD calculations, by realistic MC event generator methods, as needed for precision LHC physics.In this ongoing program of research, we discuss recent results as they relate to the interplay of the attendant IR-Improved DGLAP-CS theory of one of us and the precision of exact NLO matrix element matched parton shower MC's in the Herwig6.5 environment in relation to recent LHC experimental observations. There continues to be reason for optimism in the attendant comparison of theory and experiment.
description: 11 pages, 3 figures; now 12 pages, 4 figures -- explanatory material added and title changed for publication in Phys. Lett. B