cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Non-Hermitian quantum mechanics in non-commutative space
Creators: name: Giri, Pulak Ranjan
name: Roy, P
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study non Hermitian quantum systems in noncommutative space as well as a \cal{PT}-symmetric deformation of this space. Specifically, a \mathcal{PT}-symmetric harmonic oscillator together with iC(x_1+x_2) interaction is discussed in this space and solutions are obtained. It is shown that in the \cal{PT} deformed noncommutative space the Hamiltonian may or may not possess real eigenvalues depending on the choice of the noncommutative parameters. However, it is shown that in standard noncommutative space, the iC(x_1+x_2) interaction generates only real eigenvalues despite the fact that the Hamiltonian is not \mathcal{PT}-symmetric. A complex interacting anisotropic oscillator system has also been discussed.
description: 5 pages, revised version
Thermodynamic Properties of Kagome Antiferromagnets with different Perturbations
Creators: name: Singh, Rajiv R. P.
name: Rigol, Marcos
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss the results of several small perturbations to the thermodynamic properties of Kagome Lattice Heisenberg Model (KLHM) at high and intermediate temperatures, including Curie impurities, dilution, in-plane and out of plane Dzyaloshinski-Moria (DM) anisotropies and exchange anisotropy. We examine the combined role of Curie impurities and dilution in the behavior of uniform susceptibility. We also study the changes in specific heat and entropy with various anisotropies. Their relevance to newly discovered materials ZnCu3(OH)6Cl2 is explored. We find that the magnetic susceptibility is well described by about 6 percent impurity and dilution. We also find that the entropy difference between the material and KLHM is well described by the DM parameter D_z/J~0.1.
description: 6 pages, 3 figures, proceedings of the HFM 2008 Conference
Dynamical electroweak symmetry breaking due to strong Yukawa interactions
Creators: name: Benes, Petr
name: Brauner, Tomas
name: Smetana, Adam
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a new mechanism for electroweak symmetry breaking (EWSB) based on a strong Yukawa dynamics. We consider an SU(2)_L x U(1)_Y gauge invariant model endowed with the usual Standard model fermion multiplets and with two massive scalar doublets. We show that, unlike in the Standard model, EWSB is possible even with vanishing vacuum expectation values of the scalars. Such EWSB is achieved dynamically by means of the (presumably strong) Yukawa couplings and manifests itself by the emergence of fermion and gauge boson masses and scalar mass-splittings, which are expressed in a closed form in terms of the fermion and scalar proper self-energies. The `would-be' Nambu--Goldstone bosons are shown to be composites of both the fermions and the scalars. We demonstrate that the simplest version of the model is compatible with basic experimental constraints.
description: 6 pages, REVTeX4, 3 eps figures; discussion of compatibility with EW precision data added; version published in J. Phys. G
No purification for two copies of a noisy entangled state
Creators: name: Short, Anthony J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider whether two copies of a noisy entangled state can be transformed into a single copy of greater purity using local operations and classical communication. We show that it is never possible to achieve such a purification with certainty when the family of noisy states is twirlable (i.e. when there exists a local transformation that maps all states into the family, yet leaves the family itself invariant). This implies that two copies of a Werner state cannot be deterministically purified. Furthermore, due to the construction of the proof, it will hold not only in quantum theory, but in any generalised probabilistic theory. We use this to show that two copies of a noisy PR-box (a hypothetical device more non-local than is allowed by quantum theory) cannot be purified.
description: 4 pages, 2 figures
Multiple frustration-induced plateaus in a magnetization process of the mixed spin-1/2 and spin-3/2 Ising-Heisenberg diamond chain
Creators: name: Strecka, J.
name: Canova, L.
name: Lucivjansky, T.
name: Jascur, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Magnetization process of the mixed spin-1/2 and spin-3/2 Ising-Heisenberg diamond chain is examined by combining three exact analytical techniques: Kambe projection method, decoration-iteration transformation and transfer-matrix method. Multiple frustration-induced plateaus in a magnetization process of this geometrically frustrated system are found provided that a relative ratio between the antiferromagnetic Heisenberg- and Ising-type interactions exceeds some particular value. By contrast, there is just a single magnetization plateau if the frustrating Heisenberg interaction is sufficiently small compared to the Ising one.
description: 4 pages, 1 figure, presented at International Conference on Highly Frustrated Magnetism (HFM 2008), 7-12 September, 2008, Braunschweig, Germany, to be published in Journal of Physics: Conference Series
title: Front Matter, Table of Contents, Preface, Awards, Conference Organization, External Reviewers
Creators: name: Raz, Ran
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2016
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Awards
subject: Conference Organization
subject: External Reviewers

description: Front Matter, Table of Contents, Preface, Awards, Conference Organization, External Reviewers
description: LIPIcs, Vol. 50, 31st Conference on Computational Complexity (CCC 2016), pages 0:i-0:xvi
SMA CO(2-1) Observations of CG30: A Protostellar Binary System with a High-Velocity Quadrupolar Molecular Outflow
Creators: name: Chen, Xuepeng
name: Bourke, Tyler L.
name: Launhardt, Ralf
name: Henning, Thomas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present interferometric observations in the 12CO (2-1) line and at 1.3 mm dust continuum of the low-mass protostellar binary system in the cometary globule CG30, using the Submillimeter Array. The dust continuum images resolve two compact sources (CG30N and CG30S), with a linear separation of ~8700 AU and total gas masses of ~1.4 and ~0.6 M_sun, respectively. With the CO images, we discover two high-velocity bipolar molecular outflows, driven by the two sources. The two outflows are nearly perpendicular to each other, showing a quadrupolar morphology. The northern bipolar outflow extends along the southeast (redshifted, with a velocity up to ~23 km/s) and northwest (blueshifted, velocity up to ~30 km/s) directions, while the southern pair has an orientation from southwest (blueshifted, velocity up to 13 km/s) to northeast (redshifted, velocity up to ~41 km/s). The outflow mass of the northern pair, driven by the higher mass source CG30N, is ~9 times larger than that of the southern pair. The discovery of the quadrupolar molecular outflow in the CG30 protobinary system, as well as the presence of other quadrupolar outflows associated with binary systems, demonstrate that the disks in (wide) binary systems are not necessarily co-aligned after fragmentation.
description: 12 pages, 3 figures, to be published by ApJL in October 2008
From Dust to Planets I: Planetesimal and Embryo Formation
Creators: name: Coleman, Gavin A. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Planet formation models begin with proto-embryos and planetesimals already fully formed, missing out a crucial step, the formation of planetesimals/proto-embryos. In this work, we include prescriptions for planetesimal and proto-embryo formation arising from pebbles becoming trapped in short-lived pressure bumps, in thermally evolving viscous discs to examine the sizes and distributions of proto-embryos and planetesimals throughout the disc. We find that planetesimal sizes increase with orbital distance, from ~10 km close to the star to hundreds of kilometres further away. Proto-embryo masses are also found to increase with orbital radius, ranging from $10^{-6} M_{\rm \oplus}$ around the iceline, to $10^{-3} M_{\rm \oplus}$ near the orbit of Pluto. We include prescriptions for pebble and planetesimal accretion to examine the masses that proto-embryos can attain. Close to the star, planetesimal accretion is efficient due to small planetesimals, whilst pebble accretion is efficient where pebble sizes are fragmentation limited, but inefficient when drift dominated due to low accretion rates before the pebble supply diminishes. Exterior to the iceline, planetesimal accretion becomes inefficient due to increasing planetesimal eccentricities, whilst pebble accretion becomes more efficient as the initial proto-embryo masses increase, allowing them to significantly grow before the pebble supply is depleted. Combining both scenarios allows for more massive proto-embryos at larger distances, since the accretion of planetesimals allows pebble accretion to become more efficient, allowing giant planet cores to form at distances upto 10 au. By including more realistic initial proto-embryo and planetesimal sizes, as well as combined accretion scenarios, should allow for a more complete understanding in the beginning to end process of how planets and planetary systems form.
description: Accepted for publication in MNRAS. 21 Pages, 15 Figures
Spontaneous order in the highly frustrated spin-1/2 Ising-Heisenberg model on the triangulated Kagome lattice due to the Dzyaloshinskii-Moriya anisotropy
Creators: name: Strecka, Jozef
name: Canova, Lucia
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The spin-1/2 Ising-Heisenberg model on the triangulated Kagome (triangles-in-triangles) lattice is exactly solved by establishing a precise mapping correspondence to the simple spin-1/2 Ising model on Kagome lattice. It is shown that the disordered spin liquid state, which otherwise occurs in the ground state of this frustrated spin system on assumption that there is a sufficiently strong antiferromagnetic intra-trimer interaction, is eliminated from the ground state by arbitrary but non-zero Dzyaloshinskii-Moriya anisotropy.
description: 4 pages, 3 figures, to be presented at conference Highly Frustrated Magnetism, 7-12 September 2008, Braunschweig, Germany
title: La méthode Impact-Echo appliquée à l’auscultation des ponts en maçonnerie : étude préliminaire
Creators: name: Rezgui Chaabouni, Hajer
name: Yotte, Sylvie
name: Takarli, Mokhfi
Publisher: name: Academic Journal of Civil Engineering
Year: 2019

description: L’Impact Echo est une méthode de contrôle non destructif qui a fait l’objet de nombreux travaux, notamment sur les ouvrages en béton. Cette étude préliminaire, se situe dans le cadre de l’auscultation non destructive des ponts en maçonnerie. Pour pouvoir identifier d’éventuels défauts dans la maçonnerie, il faut pouvoir les différencier des éléments constitutifs de l’ouvrage (pierre, joint, remplissage). Pour cela on a recours à une simulation numérique nous permettant d’introduire dans la géométrie de façon progressive ces éléments constitutifs et enfin les défauts. Cette simulation permet de mettre en évidence des conditions géométriques et mécaniques conduisant à l’identification ou non des défauts.
description: Academic Journal of Civil Engineering, Vol 36 No 1 (2018): Special Issue - RUGC 2018 St Etienne
Decision-making Oriented Clustering: Application to Pricing and Power Consumption Scheduling
Creators: name: Zhang, Chao
name: Lasaulce, Samson
name: Hennebel, Martin
name: Saludjian, Lucas
name: Panciatici, Patrick
name: Poor, H. Vincent
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Data clustering is an instrumental tool in the area of energy resource management. One problem with conventional clustering is that it does not take the final use of the clustered data into account, which may lead to a very suboptimal use of energy or computational resources. When clustered data are used by a decision-making entity, it turns out that significant gains can be obtained by tailoring the clustering scheme to the final task performed by the decision-making entity. The key to having good final performance is to automatically extract the important attributes of the data space that are inherently relevant to the subsequent decision-making entity, and partition the data space based on these attributes instead of partitioning the data space based on predefined conventional metrics. For this purpose, we formulate the framework of decision-making oriented clustering and propose an algorithm providing a decision-based partition of the data space and good representative decisions. By applying this novel framework and algorithm to a typical problem of real-time pricing and that of power consumption scheduling, we obtain several insightful analytical results such as the expression of the best representative price profiles for real-time pricing and a very significant reduction in terms of required clusters to perform power consumption scheduling as shown by our simulations.
description: Published in Applied Energy
Optimal investment and consumption in a Black--Scholes market with Lévy-driven stochastic coefficients
Creators: name: Delong, Łukasz
name: Klüppelberg, Claudia
Publisher: name: arXiv
Year: 2008
Subjects: subject: Pricing of Securities (q-fin.PR)
subject: Probability (math.PR)
subject: FOS: Economics and business
subject: FOS: Mathematics
subject: 93E20, 91B28 (Primary) 60H30, 60J75 (Secondary)

description: In this paper, we investigate an optimal investment and consumption problem for an investor who trades in a Black--Scholes financial market with stochastic coefficients driven by a non-Gaussian Ornstein--Uhlenbeck process. We assume that an agent makes investment and consumption decisions based on a power utility function. By applying the usual separation method in the variables, we are faced with the problem of solving a nonlinear (semilinear) first-order partial integro-differential equation. A candidate solution is derived via the Feynman--Kac representation. By using the properties of an operator defined in a suitable function space, we prove uniqueness and smoothness of the solution. Optimality is verified by applying a classical verification theorem.
description: Published in at http://dx.doi.org/10.1214/07-AAP475 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Reductive precipitation of molybdenum oxides for recovery of molybdenum from hypochlorite leach solutions
Creators: name: Reid, Duncan Craig
Publisher: name: University of British Columbia
Year: 2010

description: The feasibility of reductive precipitation of molybdenum oxides as the molybdenum recovery stage of a hypochlorite leach of Cu-Mo rougher concentrates has been investigated. Hydrogen gas at elevated temperature and pressure and hydrazine at moderate temperature and atmospheric pressure were used as reductants. Reduction was performed on solutions containing 5 to 17 g/l Mo as sodium molybdate. Hydrogen reduction was successful only in the presence of a Pt catalyst, temperature = 200°C, pressure = 30 atm of H₂, and initial acidification to pH = 2. Ten hours was required to obtain 90% recovery of molybdenum as MoO₂. Reduction with hydrazine yielded an MoO(OH)₃ precipitate with 90% recovery obtained in 40 minutes at 50°C, pH = 4.5, and initial mole ratio of hydrazine to molybdenum of 4:1. Precipitation under the same conditions in the presence of 3 M NaCl gave only 70% recovery in 4 hours and the precipitate contained 3.3% sodium. The effect of NaCl is explained in terms of stabilization of mixed valent ionic molybdenum species in the presence of NaCl.
Constrains on optical emission of FAST-detected FRB 20181130B with GWAC synchronized observations
Creators: name: Xin, L. P.
name: Li, H. L.
name: Wang, J.
name: Han, X. H.
name: Qiu, Y. L.
name: Cai, H. B.
name: Niu, C. H.
name: Lu, X. M.
name: Liang, E. W.
name: Dai, Z. G.
name: Wang, X. G.
name: Wang, X. Y.
name: Huang, L.
name: Wu, C.
name: Li, G. W.
name: Feng, Q. C.
name: Deng, J. S.
name: Sun, S. S.
name: Yang, Y. G.
name: Wei, J. Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Multi-wavelength simultaneous observations are essential to the constraints on the origin of fast radio bursts (FRBs). However, it is a significant observational challenge due to the nature of FRBs as transients with a radio millisecond duration, which occur randomly in the sky regardless of time and position. Here, we report the search for short-time fast optical bursts in the GWAC archived data associated with FRB 20181130B, which were detected by the Five Hundred Meter Spherical Radio Telescope (FAST) and recently reported. No new credible sources were detected in all single GWAC images with an exposure time of 10 s, including image with coverage of the expected arrival time in optical wavelength by taking the high dispersion measurements into account. Our results provide a limiting magnitude of 15.43$\pm0.04$ mag in R band, corresponding to a flux density of 1.66 Jy or 8.35 mag in AB system by assuming that the duration of the optical band is similar to that of the radio band of about 10 ms. This limiting magnitude makes the spectral index of $α<0.367$ from optical to radio wavelength. The possible existence of longer duration optical emission was also investigated with an upper limits of 0.33 Jy (10.10 mag), 1.74 mJy (15.80 mag) and 0.16 mJy (18.39 mag) for the duration of 50 ms, 10 s and 6060 s, respectively. This undetected scenario could be partially attributed to the shallow detection capability, as well as the high inferred distance of FRB 20181130B and the low fluence in radio wavelength. The future detectability of optical flashes associated with nearby and bright FRBs are also discussed in this paper.
description: Accepted by ApJ
Revisiting Event Horizon Finders
Creators: name: Cohen, Michael I.
name: Pfeiffer, Harald P.
name: Scheel, Mark A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Event horizons are the defining physical features of black hole spacetimes, and are of considerable interest in studying black hole dynamics. Here, we reconsider three techniques to localise event horizons in numerical spacetimes: integrating geodesics, integrating a surface, and integrating a level-set of surfaces over a volume. We implement the first two techniques and find that straightforward integration of geodesics backward in time to be most robust. We find that the exponential rate of approach of a null surface towards the event horizon of a spinning black hole equals the surface gravity of the black hole. In head-on mergers we are able to track quasi-normal ringing of the merged black hole through seven oscillations, covering a dynamic range of about 10^5. Both at late times (when the final black hole has settled down) and at early times (before the merger), the apparent horizon is found to be an excellent approximation of the event horizon. In the head-on binary black hole merger, only {\em some} of the future null generators of the horizon are found to start from past null infinity; the others approach the event horizons of the individual black holes at times far before merger.
description: 30 pages, 15 figures, revision 2
Validity of the relativistic impulse approximation for elastic proton-nucleus scattering at energies lower than 200 MeV
Creators: name: Li, Z. P.
name: Hillhouse, G. C.
name: Meng, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present the first study to examine the validity of the relativistic impulse approximation (RIA) for describing elastic proton-nucleus scattering at incident laboratory kinetic energies lower than 200 MeV. For simplicity we choose a $^{208}$Pb target, which is a spin-saturated spherical nucleus for which reliable nuclear structure models exist. Microscopic scalar and vector optical potentials are generated by folding invariant scalar and vector scattering nucleon-nucleon (NN) amplitudes, based on our recently developed relativistic meson-exchange model, with Lorentz scalar and vector densities resulting from the accurately calibrated PK1 relativistic mean field model of nuclear structure. It is seen that phenomenological Pauli blocking (PB) effects and density-dependent corrections to $σ$N and $ω$N meson-nucleon coupling constants modify the RIA microscopic scalar and vector optical potentials so as to provide a consistent and quantitative description of all elastic scattering observables, namely total reaction cross sections, differential cross sections, analyzing powers and spin rotation functions. In particular, the effect of PB becomes more significant at energies lower than 200 MeV, whereas phenomenological density-dependent corrections to the NN interaction {\it also} play an increasingly important role at energies lower than 100 MeV.
description: 25 pages, 10 figures, accepted for publication in Phys. Rev. C
Use of the online platform Moodle in the reformed teaching within the Department of Neohellenistic Studies at the Faculty of Philology, University of Belgrade
Creators: name: Ljudmila, Petkovic
Publisher: name: Zenodo
Year: 2018
Subjects: hybrid learning, Moodle, modern Greek language, literature, university teaching

description: This paper deals with the Modern Greek language and literature learning using the Moodle electronic platform within the hybrid and online learning model. The subject of the discussion will be the main features of this teaching method, as well as the application of Moodle in working with the first-year undergraduate students of the Department of Neohellenistic Studies at the Faculty of Philology, University of Belgrade. We will examine the effectiveness of the mixed-mode learning by presenting the electronic contents that are available on the online courses Contemporary Greek Language G-1 and G-2, Greek Literature 1 and Practicum in Neohellenistics 2. Special attention will be devoted to the analysis of the course interactivity, multimediality, and flexibility. Finally, we will also expose the results of the accompanying empirical research, which lead to the conclusion that the implementation of Moodle in teaching significantly helps students in learning.
Testing single-photon wave packets by Hong-Ou-Mandel interference
Creators: name: Kolenderski, Piotr
name: Banaszek, Konrad
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss characterization of single-photon wave packets by measuring Hong-Ou-Mandel interference with a weak coherent pulse. A complete multimode calculation is presented and effects of multiphoton terms in the coherent field as well as the impact of source and detection imperfections are discussed.
description: Submitted to IEEE conference proceedings: National Conference on Telecommunication Technologies and Malaysia Conference on Photonics 2008
Pulsating White Dwarf Stars and Precision Asteroseismology
Creators: name: Winget, D. E.
name: Kepler, S. O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Galactic history is written in the white dwarf stars. Their surface properties hint at interiors composed of matter under extreme conditions. In the forty years since their discovery, pulsating white dwarf stars have moved from side-show curiosities to center stage as important tools for unraveling the deep mysteries of the Universe. Innovative observational techniques and theoretical modeling tools have breathed life into precision asteroseismology. We are just learning to use this powerful tool, confronting theoretical models with observed frequencies and their time rate-of-change. With this tool, we calibrate white dwarf cosmochronology; we explore equations of state; we measure stellar masses, rotation rates, and nuclear reaction rates; we explore the physics of interior crystallization; we study the structure of the progenitors of Type Ia supernovae, and we test models of dark matter. The white dwarf pulsations are at once the heartbeat of galactic history and a window into unexplored and exotic physics.
description: 70 pages, 11 figures, to be published in Annual Review of Astronomy and Astrophysics 2008
Two-electron ionization in strong laser fields below intensity threshold: signatures of attosecond timing in correlated spectra
Creators: name: Bondar, Denys I.
name: Liu, Wing-Ki
name: Ivanov, Misha Yu.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We develop an analytical model of correlated two-electron ionization in strong infrared laser fields. The model includes all relevant interactions between the electrons, the laser field, and the ionic core nonperturbatively. We focus on the deeply quantum regime, where the energy of the active electron driven by the laser field is insufficient to collisionally ionize the parent ion, and the assistance of the laser field is required to create a doubly charged ion. In this regime, the electron-electron and the electron-ion interactions leave distinct footprints in the correlated two-electron spectra, recording the mutual dynamics of the escaping electrons.
description: 25 pages and 4 figures
title: Теория вероятностей и математическая статистика. Вероятностные модели, основы статистического анализа данных
title: конспект лекций
titleType: Subtitle
Creators: name: Положинцев, Борис
Publisher: name: Изд-во Политехн. ун-та
Year: 2018
Subjects: Математическая статистика
Статистический анализ

description: Курс является базовым по отношению непосредственно к следующим за ним курсам "Общая теория связи" и "Введение в статистическую радиотехнику”. Конспект лекций по курсу "Теория вероятностей и математическая статистика: вероятностные модели, основы статистического анализа данных” предназначен студентам, обучающимся по направлениям 11.03.01 "Радиотехника" и 11.03.02 "Инфокоммуникационные технологии и системы связи".
Effect of edge removal on topological and functional robustness of complex networks
Creators: name: He, Shan
name: Li, Sheng
name: Ma, Hongru
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We study the robustness of complex networks subject to edge removal. Several network models and removing strategies are simulated. Rather than the existence of the giant component, we use total connectedness as the criterion of breakdown. The network topologies are introduced a simple traffic dynamics and the total connectedness is interpreted not only in the sense of topology but also in the sense of function. We define the topological robustness and the functional robustness, investigate their combined effect and compare their relative importance to each other. The results of our study provide an alternative view of the overall robustness and highlight efficient ways to improve the robustness of the network models.
description: 21 pages, 9 figures
title: Front Matter, Table of Contents, Foreword, Conference Organization, External Reviewers, Sponsors
Creators: name: Fekete, Sándor
name: Lubiw, Anna
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2016
Subjects: subject: Front Matter
subject: Table of Contents
subject: Foreword
subject: Conference Organization
subject: External Reviewers
subject: Sponsors

description: Front Matter, Table of Contents, Foreword, Conference Organization, External Reviewers, Sponsors
description: LIPIcs, Vol. 51, 32nd International Symposium on Computational Geometry (SoCG 2016), pages 0:i-0:xviii
The HI Column Density Distribution of the Galactic Disk and Halo
Creators: name: French, David M.
name: Fox, Andrew J.
name: Wakker, Bart P.
name: Norman, Colin
name: Lehner, Nicolas
name: Howk, J. Christopher
name: Savage, Blair D.
name: Richter, Philipp
name: O'Meara, John
name: Borthakur, Sanchayeeta
name: Heckman, Timoth
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a census of neutral gas in the Milky Way disk and halo down to limiting column densities of $N$(HI)$\sim10^{14}$ cm$^{-2}$ using measurements of HI Lyman-series absorption from the Far Ultraviolet Spectroscopic Explorer (FUSE). Our results are drawn from an analysis of 25 AGN sightlines spread evenly across the sky with Galactic latitude |b|$\gtrsim 20^{\circ}$. By simultaneously fitting multi-component Voigt profiles to 11 Lyman-series absorption transitions covered by FUSE (Ly$β$-Ly$μ$) plus HST measurements of Ly$α$, we derive the kinematics and column densities of a sample of 152 HI absorption components. While saturation prevents accurate measurements of many components with column densities 17$\lesssim$log$N$(HI)$\lesssim$19, we derive robust measurements at log$N$(HI)$\lesssim$17 and log$N$(HI)$\gtrsim$19. We derive the first ultraviolet HI column density distribution function (CDDF) of the Milky Way, both globally and for low-velocity (ISM), intermediate-velocity clouds (IVCs), and high-velocity clouds (HVCs). We find that IVCs and HVCs show statistically indistinguishable CDDF slopes, with $β_{\rm IVC}=$ $-1.01_{-0.14}^{+0.15}$ and $β_{\rm HVC}=$ $-1.05_{-0.06}^{+0.07}$. Overall, the CDDF of the Galactic disk and halo appears shallower than that found by comparable extragalactic surveys, suggesting a relative abundance of high-column density gas in the Galactic halo. We derive the sky covering fractions as a function of HI column density, finding an enhancement of IVC gas in the northern hemisphere compared to the south. We also find evidence for an excess of inflowing HI over outflowing HI, with $-$0.88$\pm$0.40 M$_\odot$ yr$^{-1}$ of HVC inflow versus 0.20$\pm$0.10 M$_\odot$ yr$^{-1}$ of HVC outflow, confirming an excess of inflowing HVCs seen in UV metal lines.
description: Accepted for publication in ApJ. 55 pages, 42 figures, 4 tables
First stars and the extragalactic background light: How recent gamma-ray observations constrain the early universe
Creators: name: Raue, M.
name: Kneiske, T.
name: Mazin, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The formation of the first stars (Population III; PopIII) marks the end of the dark ages of the universe, a subject of lively scientific debate. Not (yet) accessible to direct observations, this early stage of the universe is mostly studied via theoretical calculations and numerical simulations. An indirect window is provided by integrated present day observables such as the metal abundance or the diffuse extragalactic photon fields. We aim to derive constraints on the properties of the PopIII and low metallicity Population II (LM PopII) stars utilizing limits on the density of the extragalactic background light (EBL), recently derived from very-high-energy (E > 100 GeV; VHE) observations. A model calculation for the evolving EBL density produced by PopIII/LM PopII stars is presented. The model utilizes stellar population spectra (SPS) for zero and low metallicity stars and accounts for the changing emission of an aging stellar population. Emission from the dense HII regions surrounding the stars (nebula) is included. The resulting EBL density for different scenarios (metallicity, star formation rate, initial mass function) is compared to the limit on the EBL density. The potential for detecting a cut-off in HE/VHE spectra is discussed. Assuming a maximum contribution from PopIII/LM PopII stars to the EBL density of 5 nW m^-2 s-1 at 2 micrometer a limit on the star formation rate (SFR) of the first stars of 0.3 to 3 M_solar Mpc^-3 yr^-1 in the redshift range 7 - 14 is derived. The limit depends on the assumed shape of the SFR and metallicity.
description: 11 pages, 11 figures, accepted for publication in A&A, v2: references added, discussion extended, conclusions unchanged
Estimating radiative momentum transfer through a thermal analysis of the Pioneer Anomaly
Creators: name: Bertolami, O.
name: Francisco, F.
name: Gil, P. J. S.
name: Páramos, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Space Physics (physics.space-ph)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A methodology based on point-like sources is discussed, enabling a reliable estimate of the acceleration of the Pioneer 10 and 11 probes caused by thermal effects. A sensitivity analysis of the several parameters of the model allows for a clear indication of the possible thermal origin of the so-called Pioneer anomaly.
description: 16 pages, 7 figures, 5 tables; talk delivered by one of us (JP) on the workshop "Satellite dynamics Modelling, In-Orbit Calibration and Data Processing", May 21 - 23, 2008, ZARM, University of Bremen, Germany
Continuum elastic modeling of graphene resonators
Creators: name: Atalaya, Juan
name: Isacsson, Andreas
name: Kinaret, Jari M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Starting from an atomistic approach we have derived a hierarchy of successively more simplified continuum elasticity descriptions for modeling the mechanical properties of suspended graphene sheets. The descriptions are validated by applying them to square graphene-based resonators with clamped edges and studying numerically their mechanical responses. Both static and dynamic responses are treated. We find that already for deflections of the order of 0.5Å a theory that correctly accounts for nonlinearities is necessary and that for many purposes a set of coupled Duffing-type equations may be used to accurately describe the dynamics of graphene membranes.
description: 7 pages, 5 figures
Data-driven model predictive control: closed-loop guarantees and experimental results
Creators: name: Berberich, Julian
name: Köhler, Johannes
name: Müller, Matthias A.
name: Allgöwer, Frank
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: We provide a comprehensive review and practical implementation of a recently developed model predictive control (MPC) framework for controlling unknown systems using only measured data and no explicit model knowledge. Our approach relies on an implicit system parametrization from behavioral systems theory based on one measured input-output trajectory. The presented MPC schemes guarantee closed-loop stability for unknown linear time-invariant (LTI) systems, even if the data are affected by noise. Further, we extend this MPC framework to control unknown nonlinear systems by continuously updating the data-driven system representation using new measurements. The simple and intuitive applicability of our approach is demonstrated with a nonlinear four-tank system in simulation and in an experiment.
FRBs Lensed by Point Masses II. The multi-peaked FRBs from the point view of microlensing
Creators: name: Chen, Xuechun
name: Shu, Yiping
name: Li, Guoliang
name: Zheng, Wenwen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The microlensing effect has developed into a powerful technique for a diverse range of applications including exoplanet discoveries, structure of the Milky Way, constraints on MAssive Compact Halo Objects, and measurements of the size and profile of quasar accretion discs. In this paper, we consider a special type of microlensing events where the sources are fast radio bursts with $\sim$milliseconds (ms) durations for which the relative motion between the lens and source is negligible. In this scenario, it is possible to temporally resolve the individual microimages. As a result, a method beyond the inverse ray shooting (IRS) method, which only evaluates the total magnification of all microimages, is needed. We therefore implement an algorithm for identifying individual microimages and computing their magnifications and relative time delays. We validate our algorithm by comparing to analytical predictions for a single microlens case and find excellent agreement. We show that the superposition of pulses from individual microimages produces a light curve that appears as multi-peaked FRBs. The relative time delays between pulses can reach 0.1--1 ms for stellar-mass lenses and hence can already be resolved temporally by current facilities. Although not yet discovered, microlensing of FRBs will become regular events and surpass the number of quasar microlensing events in the near future when $10^{4-5}$ FRBs are expected to be discovered on a daily basis. Our algorithm provides a way of generating the microlensing light curve that can be used for constraining stellar mass distribution in distant galaxies.
description: 14 pages, 6 figures, accepted for publication in ApJ
Density dependence of spin relaxation in GaAs quantum well at room temperature
Creators: name: Teng, L. H.
name: Zhang, P.
name: Lai, T. S.
name: Wu, M. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Carrier density dependence of electron spin relaxation in an intrinsic GaAs quantum well is investigated at room temperature using time-resolved circularly polarized pump-probe spectroscopy. It is revealed that the spin relaxation time first increases with density in the relatively low density regime where the linear D'yakonov-Perel' spin-orbit coupling terms are dominant, and then tends to decrease when the density is large and the cubic D'yakonov-Perel' spin-orbit coupling terms become important. These features are in good agreement with theoritical predictions by Lü {\em et al.} [Phys. Rev. B {\bf 73}, 125314 (2006)]. A fully microscopic calculation based on numerically solving the kinetic spin Bloch equations with both the D'yakonov-Perel' and the Bir-Aronov-Pikus mechanisms included, reproduces the density dependence of spin relaxation very well.
description: 4 pages, 2 figures, Europhys. Lett., in press
Complex Replica Zeros of $\pm J$ Ising Spin Glass at Zero Temperature
Creators: name: Obuchi, Tomoyuki
name: Kabashima, Yoshiyuki
name: Nishimori, Hidetoshi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Zeros of the $n$th moment of the partition function $[Z^n]$ are investigated in a vanishing temperature limit $β\to \infty$, $n \to 0$ keeping $y=βn \sim O(1)$. In this limit, the moment parameterized by $y$ characterizes the distribution of the ground-state energy. We numerically investigate the zeros for $\pm J$ Ising spin glass models with several ladder and tree systems, which can be carried out with a feasible computational cost by a symbolic operation based on the Bethe--Peierls method. For several tree systems we find that the zeros tend to approach the real axis of $y$ in the thermodynamic limit implying that the moment cannot be described by a single analytic function of $y$ as the system size tends to infinity, which may be associated with breaking of the replica symmetry. However, examination of the analytical properties of the moment function and assessment of the spin-glass susceptibility indicate that the breaking of analyticity is relevant to neither one-step or full replica symmetry breaking.
description: 27 pages, 13 figures. Added references, some comments, and corrections to minor errors
Probing thermal waves on the free surface of various media: Surface Fluctuation Specular Reflection Spectroscopy
Creators: name: Tay, Astrid
name: Thibierge, Caroline
name: Fournier, Danièle
name: Frétigny, Christian
name: Lequeux, François
name: Monteux, Cécile
name: Roger, Jean-Paul
name: Talini, Laurence
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Thermal motion gives rise to fluctuations in free surfaces; the propagation of the thermally excited waves on such surfaces depends on the mechanical properties of the medium. Their measurement can therefore provide information on those properties. We have developed an optical tool to probe the thermally excited waves on free surfaces: Surface Fluctuation Specular Reflection (SFSR) spectroscopy. It consists in measuring the fluctuations in the position of a laser beam, which is specularly reflected onto the free surface of a medium, and is therefore sensitive to the roughness of that surface. We show how the measured signal is related to the medium properties. We also present measurements performed on Newtonian liquids as well as on a viscoelastic solid; we show that, in all cases, there is a very good agreement between experimental and computed spectra. SFSR thus applies to a broad range of materials. It moreover offers a very good temporal resolution and should provide a useful tool for dynamical measurements on complex fluids.
Supplementary Data Archive for the Publication: “Object Detection Based on the Logistic Objects in Context (LOCO) Dataset: an improved dataset split and performance on NVIDIA Jetson Nano”
Creators: name: Tadjine, Chaouki
name: Ouafi, Abdelkrim
name: Taleb Ahmed, Abdelmalik
name: EL HILLALI, yassin
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 460304
subject: Computer vision
classificationCode: 461103
subject: Deep learning
classificationCode: 461199
subject: Machine learning not elsewhere classified
classificationCode: 460205
subject: Intelligent robotics
classificationCode: 350999
subject: Transportation, logistics and supply chains not elsewhere classified

description: This archive contains the supplementary data associated with the research paper, specifically the annotations used for the training and validation of the YOLO models described therein. The annotations are formatted for YOLO-based object detection and include bounding box coordinates along with their corresponding class labels for all annotated objects in the LOCO dataset.The data reflects the balanced dataset splitting introduced in the paper, thereby enabling reproducibility of the experiments and results presented. Researchers utilizing the contents of this archive are kindly requested to cite the original publication: https://doi.org/10.1007/s11554-025-01673-3.
Generalizations of the Nieh-Yan topological invariant
Creators: name: Montesinos, Merced
name: Gonzalez, Diego
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We report new topological invariants in four dimensions that are generalizations of the Nieh-Yan topological invariant. The new topological invariants are obtained through a systematic method along the lines of the one used to get the Nieh-Yan form, but involving an $SO(4,1)$ [$SO(5)$] connection constructed out from an $SO(3,1)$ [$SO(4)$] connection and three $SO(3,1)$ [$SO(4)$] tensor $1$-forms. We give explicit expressions of the new 4-forms that give rise to the new topological invariants for particular choices of these 1-forms and show that the Nieh-Yan form arises as a particular case.
description: It matches published version
Structural trends in clusters of quadrupolar spheres
Creators: name: Miller, Mark A.
name: Shepherd, James J.
name: Wales, David J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The influence of quadrupolar interactions on the structure of small clusters is investigated by adding a point quadrupole of variable strength to the Lennard-Jones potential. Competition arises between sheet-like arrangements of the particles, favoured by the quadrupoles, and compact structures, favoured by the isotropic Lennard-Jones attraction. Putative global potential energy minima are obtained for clusters of up to 25 particles using the basin-hopping algorithm. A number of structural motifs and growth sequences emerge, including star-like structures, tubes, shells and sheets. The results are discussed in the context of colloidal self-assembly.
description: 8 pages, 6 figures
title: Numerical analysis of deformation and stability in the formation for railway tracks
Creators: name: Nawaz Khan, Shah
Publisher: name: Bauhaus-Universität Weimar
Year: 2018
Subjects: subject: Eisenbahnstrecke
subject: 550

description: Over the past few decades, the increasing demands of railways operations in the form of heavy loading and high speed have been noticed. Railway formation and ballast deform progressive under heavy axle cyclic loading, therefore the rail track needs proper design of ballast and formation bed to achieve the desire stiffness and stability for the safe and sound serviceability of the track. For the overall stability of the track on soft formation, the ground is improved by different techniques prior to the construction on that, in order to avoid the failure and differential settlement during the designed trains operation. The numerical analyses illustrate that the total deformation and bearing capacity of the railway tracks mostly depend on the changes in the friction angle and cohesion of the selected soils of the subgrade. To avoid failure in the formation of track under the design loads, the proper selection of types of soils, its layer thickness, well compaction during construction and provision of proper track drainage system are extremely important. For the construction of new railway tracks the soils having greater values of friction angle, cohesion and elastic stiffness with the well graded ballast cushion under the sleepers of designed side slopes can be used to reduce the maintenance cost, considerably increase the life time of the components of the tracks and ultimately give better performance of the tracks.