cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dirac Cosmology and the Acceleration of the Contemporary Universe
Creators: name: Shao, Cheng-Gang
name: Shen, Jianyong
name: Wang, Bin
name: Su, Ru-Keng
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A model is suggested to unify the Einstein GR and Dirac Cosmology. There is one adjusted parameter $b_2$ in our model. After adjusting the parameter $b_2$ in the model by using the supernova data, we have calculated the gravitational constant $\bar G$ and the physical quantities of $a(t)$, $q(t)$ and $ρ_r(t)/ ρ_b(t)$ by using the present day quantities as the initial conditions and found that the equation of state parameter $w_θ$ equals to -0.83, the ratio of the density of the addition creation $Ω_Λ=0.8$ and the ratio of the density of the matter including multiplication creation, radiation and normal matter $Ω_m =0.2$ at present. The results are self-consistent and in good agreement with present knowledge in cosmology. These results suggest that the addition creation and multiplication creation in Dirac cosmology play the role of the dark energy and dark matter.
description: 13 pages, 8 figures
A model for reactive porous transport during re-wetting of hardened concrete
Creators: name: Chapwanya, Michael
name: Liu, Wentao
name: Stockie, John M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: A mathematical model is developed that captures the transport of liquid water in hardened concrete, as well as the chemical reactions that occur between the imbibed water and the residual calcium silicate compounds residing in the porous concrete matrix. The main hypothesis in this model is that the reaction product -- calcium silicate hydrate gel -- clogs the pores within the concrete thereby hindering water transport. Numerical simulations are employed to determine the sensitivity of the model solution to changes in various physical parameters, and compare to experimental results available in the literature.
description: 30 pages
bHROS high spectral resolution observations of PN forbidden and recombination line profiles
Creators: name: Barlow, M. J.
name: Hales, A. S.
name: Storey, P. J.
name: Liu, X. -W.
name: Tsamis, Y. G.
name: Aderin, M. E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have acquired high spectral resolution observations (R=150,000) of the planetary nebulae NGC 7009 and NGC 6153, using bHROS on Gemini South. Observations of this type may provide a key to understanding why optical recombination lines (ORLs) yield systematically higher heavy element abundances for photoionized nebulae than do the classical forbidden collisionally excited lines (CELs) emitted by the same ions; NGC 7009 and NGC 6153 have notably high ORL/CEL abundance discrepancy factors (ADFs) of 5 and 10, respectively. Due to the opposite temperature dependences of ORLs and CELs, ORLs should be preferentially emitted by colder plasma. Our bHROS observations of NGC 7009 reveal that the [O III] 4363A CEL has a FWHM linewidth that is 1.5 times larger than that shown by O II ORLs in the same spectrum, despite the fact that all of these lines are emitted by the O2+ ion. The bHROS spectra of NGC 6153 also show that its O II ORLs have significantly narrower linewidths than do the [O III] 4363A and 5007A lines but, in addition, the [O III] 4363A and 5007A lines show very different velocity profiles, implying the presence of large temperature variations in the nebula.
description: 2 pages, 1 figure, for Proceedings of IAU Symposium No. 234, `Planetary Nebulae in our Galaxy and Beyond'
Electric field control and optical signature of entanglement in quantum dot molecules
Creators: name: Bester, Gabriel
name: Zunger, Alex
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The degree of entanglement of an electron with a hole in a vertically coupled self-assembled dot molecule is shown to be tunable by an external electric field. Using atomistic pseudopotential calculations followed by a configuration interaction many-body treatment of correlations, we calculate the electronic states, degree of entanglement and optical absorption. We offer a novel way to spectroscopically detect the magnitude of electric field needed to maximize the entanglement.
description: 4 pages, 6 figures
Exponential functions in prime characteristic
Creators: name: Mattarei, Sandro
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 39B50

description: In this note we determine all power series $F(X)\in 1+X\F_p[[X]]$ such that $(F(X+Y))^{-1} F(X)F(Y)$ has only terms of total degree a multiple of $p$. Up to a scalar factor, they are all the series of the form $F(X)=E_p(cX)\cdot G(X^p)$ for some $c\in\F_p$ and $G(X)\in 1+X\F_p[[X]]$, where $E_p(X)=\exp\big(\sum_{i=0}^{\infty}X^{p^i}/p^i\big)$ is the Artin-Hasse exponential.
description: 6 pages, to be published in Aequationes Math
UIT-HSE at WNUT-2020 Task 2: Exploiting CT-BERT for Identifying COVID-19 Information on the Twitter Social Network
Creators: name: Tran, Khiem Vinh
name: Phan, Hao Phu
name: Van Nguyen, Kiet
name: Nguyen, Ngan Luu-Thuy
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Recently, COVID-19 has affected a variety of real-life aspects of the world and led to dreadful consequences. More and more tweets about COVID-19 has been shared publicly on Twitter. However, the plurality of those Tweets are uninformative, which is challenging to build automatic systems to detect the informative ones for useful AI applications. In this paper, we present our results at the W-NUT 2020 Shared Task 2: Identification of Informative COVID-19 English Tweets. In particular, we propose our simple but effective approach using the transformer-based models based on COVID-Twitter-BERT (CT-BERT) with different fine-tuning techniques. As a result, we achieve the F1-Score of 90.94\% with the third place on the leaderboard of this task which attracted 56 submitted teams in total.
description: Accepted by 2020 The 6th Workshop on Noisy User-generated Text (W-NUT) - EMNLP 2020
Inverse hyperbolic problems with time-dependent coefficients
Creators: name: Eskin, Gregory
Publisher: name: arXiv
Year: 2005
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We consider the inverse problem for the second order self-adjoint hyperbolic equation in a bounded domain in $\R^n$ with lower order terms depending analytically on the time variable. We prove that, assuming the BLR condition, the time-dependent Dirichlet-to-Neumann operator prescribed on a part of the boundary uniquely determines the coefficients of the hyperbolic equation up to a diffeomorphism and a gauge transformation. As a by-product we prove a similar result for the nonself-adjoint hyperbolic operator with time-independent coefficients.
description: The main change is the use of BLR-condition to fill the gap in the proof of the main theorem
Exploring the operation of a tiny heat engine
Creators: name: Asfaw, Mesfin
name: Bekele, Mulugeta
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We model a tiny heat engine as a Brownian particle that moves in a viscous medium in a sawtooth potential (with or without load) assisted by $\it {alternately}$ placed hot and cold heat baths along its path. We find closed form expression for the steady state current as a function of the model parameters. This enables us to deal with the energetics of the model and evaluate either its efficiency or its coefficient of performance depending upon whether the model functions either as a heat engine or as a refrigerator, respectively. We also study the way current changes with changes in parameters of interest. When we plot the phase diagrams showing the way the model operates, we not only find regions where it functions as a heat engine and as a refrigerator but we also identify a region where the model functions as neither of the two.
description: 8 pages and 13 figures
NeXSPheRIO results on elliptic flow at RHIC and connection with thermalization
Creators: name: Andrade, R.
name: Grassi, F.
name: Hama, Y.
name: Kodama, T.
name: Socolowski, O.
name: Tavares, B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Elliptic flow at RHIC is computed event-by-event with NeXSPheRIO. Reasonable agreement with experimental results on $v_2(η)$ is obtained. Various effects are studied as well: reconstruction of impact parameter direction, freeze out temperature, equation of state (with or without crossover), emission mecanism.
description: Contribution to the Proceedings of the Quark-Gluon Plasma Thermalization workshop. Content slightly increased
Application of The Wind-Driven Model to A Sample of Tidal Disruption Events
Creators: name: Uno, Kohki
name: Maeda, Keiichi
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: An origin of the Optical/UV radiation from tidal disruption events (TDEs) has recently been discussed for different scenarios, but observational support is generally missing. In this Letter, we test applicability of the `Wind-Driven model' (Uno & Maeda 2020) to a sample of UV/Optical TDEs. With the model, we aim to derive the physical properties of the Optical/UV TDEs, such as mass-loss rates and characteristic radii. The model assumes optically thick continuous outflows like stellar winds, and one key question is how the wind-launched radius is connected to physical processes in TDEs. As one possibility, through a comparison between the escape velocities estimated from their black-hole masses and the wind velocities estimated from observed line widths, we propose that the outflow is launched from the self-interaction radius ($R_{\rm SI}$) where the stellar debris stretched by the tidal force intersects; we show that the escape velocities at $R_{\rm SI}$ are roughly consistent with the wind velocities. By applying the model to a sample of Optical/UV TDE candidates, we find that explosive mass ejections ($\gtrsim 10 ~M_{\odot}{\rm yr^{-1}}$) from $R_{\rm SI}$ ($\sim 10^{14}{\rm ~cm}$) can explain the observed properties of TDEs around peak luminosity. We also apply the same framework to a peculiar transient, AT2018cow. The model suggests that AT2018cow is likely a TDE induced by an intermediate-mass black hole ($M_{\rm BH} \sim 10^{4}~M_{\odot}$).
description: 8 pages, 1 table, 4 figures, accepted for publication in the ApJL
Interpretation of Light Scattering Spectra in Terms of Particle Displacements
Creators: name: Phillies, George D. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Quasi-elastic light scattering spectroscopy of dilute solutions of diffusing mesoscopic probe particles is regularly used to examine the dynamics of the fluid through which the probe particles are moving. For probes in a simple liquid, the light scattering spectrum is a simple exponential; the field correlation function $g^{(1)}_{P}(q,τ)$ of the scattering particles is related to their mean-square displacements $\bar{X^{2}} \equiv < (Δx(τ))^{2}>$ during $τ$ via $g^{(1)}(q,τ) = \exp(- {1/2} q^{2} \bar{X^{2}})$. However, historical demonstrations of this expression refer only to ideal Brownian particles in simple liquids, and show that if the form is correct then it is also true that $g^{(1)}(q,τ) = \exp(- Γτ)$, a pure exponential in $τ$. In general, $g^{(1)}_{P}(q,τ)$ is not a single exponential in time. $g^{(1)}_{P}(q,τ)$ reflects not only the mean-square particle displacements but also all higher-order mean displacement moments $\bar{X^{2n}}$. A correct general form for $g^{(1)}(q,τ)$, replacing the generally-incorrect $\exp(- {1/2} q^{2} \bar{X^{2}})$, is obtained. A simple experimental diagnostic determining when the field correlation function gives the mean-square displacements is identified, namely $g^{(1)}(q,τ)$ reveals $\bar{X^{2}}$ if $g^{(1)}(q,τ)$ is exponential in $τ$.
description: Now 19 pages, no figures, accepted by Journal of Chemical Physics Revision: Add New Section V Spectrum of a Bidisperse System giving a concrete example of issues raised, and did minor rewrites
The role of atmospheric outflows in the migration of hot Jupiters
Creators: name: Kurbatov, Evgeny P.
name: Bisikalo, Dmitri V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Many of observed hot Jupiters are subject to atmospheric outflows. Numerical simulations have shown that the matter escaping from the atmosphere can accumulate outside the orbit of the planet, forming a torus. In a few 10^8 yr, the mass of the torus can become large enough to exert a significant gravitational effect on the planet. Accumulation of mass, in its own turn, is hindered by the activity of the star, which leads to the photoevaporation of the torus matter. We explore the role of these and other factors in the planet's migration in the epoch when the protoplanetary disk has already disappeared. Using HD209458 system as an example, we show that the gravitational interaction with the torus leads to the possibility of migration of the planet to its observable position, starting from an orbit >= 0.3 AU.
description: Accepted in MNRAS
Nonuniform phases in the geometrically frustrated dissipative XYZ model
Creators: name: Li, Xingli
name: Jin, Jiasen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the steady-state phase diagram of the dissipative spin-1/2 XYZ model on a two-dimensional triangular lattice, in which each site is coupled to a local environment. By means of cluster mean-field approximation, we find that the steady-state phases of the system are rather rich, in particular there exist various types of nonuniform antiferromagnetic phases due to the geometrical frustration. As the short-range correlations included in the analysis, the numerical results show that the oscillatory phase disappears while the triantiferromagnetic and biantiferromagnetic phases remain to exist in the thermodynamic limit. Moreover, the existence of the spin-density-wave phase, which is missed by the single-site mean-field analysis, is also revealed by the spin-structure factor.
description: 8 pages, 7 figures
Fractionalized fermionic quantum criticality in spin-orbital Mott insulators
Creators: name: Seifert, Urban F. P.
name: Dong, Xiao-Yu
name: Chulliparambil, Sreejith
name: Vojta, Matthias
name: Tu, Hong-Hao
name: Janssen, Lukas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study transitions between topological phases featuring emergent fractionalized excitations in two-dimensional models for Mott insulators with spin and orbital degrees of freedom. The models realize fermionic quantum critical points in fractionalized Gross-Neveu$^\ast$ universality classes in (2+1) dimensions. They are characterized by the same set of critical exponents as their ordinary Gross-Neveu counterparts, but feature a different energy spectrum, reflecting the nontrivial topology of the adjacent phases. We exemplify this in a square-lattice model, for which an exact mapping to a $t$-$V$ model of spinless fermions allows us to make use of large-scale numerical results, as well as in a honeycomb-lattice model, for which we employ $ε$-expansion and large-$N$ methods to estimate the critical behavior. Our results are potentially relevant for Mott insulators with $d^1$ electronic configurations and strong spin-orbit coupling, or for twisted bilayer structures of Kitaev materials.
description: 6+6 pages, 2+3 figures; v3 (minor changes, discussion on strong-coupling limit)
Chaplygin gas dominated anisotropic brane world cosmological models
Creators: name: Mak, M. K.
name: Harko, T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present exact solutions of the gravitational field equations in the generalized Randall-Sundrum model for an anisotropic brane with Bianchi type I geometry, with a generalized Chaplygin gas as matter source. The generalized Chaplygin gas, which interpolates between a high density relativistic era and a non-relativistic matter phase, is a popular dark energy candidate. For a Bianchi type I space-time brane filled with a cosmological fluid obeying the generalized Chaplygin equation of state the general solution of the gravitational field equations can be expressed in an exact parametric form, with the comoving volume taken as parameter. In the limiting cases of a stiff cosmological fluid, with pressure equal to the energy density, and for a pressureless fluid, the solution of the field equations can be expressed in an exact analytical form. The evolution of the scalar field associated to the Chaplygin fluid is also considered and the corresponding potential is obtained. The behavior of the observationally important parameters like shear, anisotropy and deceleration parameter is considered in detail.
description: 13 pages, 6 figures, accepted for publication in PRD
Bases for certain cohomology representations of the symmetric group
Creators: name: Henderson, Anthony
Publisher: name: arXiv
Year: 2005
Subjects: subject: Representation Theory (math.RT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 20C30 (Primary); 58A10

description: We give a combinatorial description (including explicit differential-form bases) for the cohomology groups of the space of n distinct nonzero complex numbers, with coefficients in rank-one local systems which are of finite monodromy around the coordinate hyperplanes and trivial monodromy around all other hyperplanes. In the case where the local system is equivariant for the symmetric group, we write the cohomology groups as direct sums of inductions of one-dimensional characters of subgroups. This relies on an equivariant description of the Orlik-Solomon algebras of full monomial reflection groups (wreath products of the symmetric group with a cyclic group). The combinatorial models involved are certain representations of these wreath products which possess bases indexed by labelled trees.
description: 30 pages; in third version, more references are added, making further connections with general theory of cohomology of local systems on hyperplane complements; also the consequences of the main result for cohomology dimensions and module generators are stated more explicitly
Human Heuristics for Autonomous Agents
Creators: name: Bagnoli, Franco
name: Guazzini, Andrea
name: Lio', Pietro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Multiagent Systems (cs.MA)
subject: Human-Computer Interaction (cs.HC)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: We investigate the problem of autonomous agents processing pieces of information that may be corrupted (tainted). Agents have the option of contacting a central database for a reliable check of the status of the message, but this procedure is costly and therefore should be used with parsimony. Agents have to evaluate the risk of being infected, and decide if and when communicating partners are affordable. Trustability is implemented as a personal (one-to-one) record of past contacts among agents, and as a mean-field monitoring of the level of message corruption. Moreover, this information is slowly forgotten in time, so that at the end everybody is checked against the database. We explore the behavior of a homogeneous system in the case of a fixed pool of spreaders of corrupted messages, and in the case of spontaneous appearance of corrupted messages.
description: 12 pages
Quantum Corrections in 2D SUSY CP^{N-1} Sigma Model on Noncommutative Superspace
Creators: name: Araki, Kazutoshi
name: Inami, Takeo
name: Nakajima, Hiroaki
name: Saito, Yorinori
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate quantum corrections in two-dimensional CP^{N-1} supersymmetric nonlinear sigma model on noncommutative superspace. We show that this model is renormalizable, the N=2 SUSY sector is not affected by the C-deformation and that the non(anti)commutativity parameter C receives infinite renormalization at one-loop order. And it is the renormalizability of the model at one-loop order.
description: 11 pages, 1 figure
A precise asteroseismic age and metallicity for HD 139614: a pre-main-sequence star with a protoplanetary disc in Upper-Centaurus Lupus
Creators: name: Murphy, Simon J.
name: Joyce, Meridith
name: Bedding, Timothy R.
name: White, Timothy R.
name: Kama, Mihkel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: HD\,139614 is known to be a $\sim$14-Myr-old, possibly pre-main-sequence star in the Sco-Cen OB association in the Upper Centaurus-Lupus subgroup, with a slightly warped circumstellar disc containing ring structures hinting at one or more planets. The star's chemical abundance pattern is metal-deficient except for volatile elements, which places it in the $λ$ Boo class and suggests it has recently accreted gas-rich but dust-poor material. We identify seven dipole and four radial pulsation modes among its $δ$ Sct pulsations using the TESS light curve and an échelle diagram. Precision modelling with the MESA stellar evolution and GYRE stellar oscillation programs confirms it is on the pre-main sequence. Asteroseismic, grid-based modelling suggests an age of $10.75\pm0.77$ Myr, a mass of $1.52\pm0.02$ M$_{\odot}$, and a global metal abundance of $Z=0.0100\pm0.0010$. This represents the first asteroseismic determination of the bulk metallicity of a $λ$ Boo star. The precise age and metallicity offer a benchmark for age estimates in Upper Centaurus--Lupus, and for understanding disc retention and planet formation around intermediate-mass stars.
description: Figures make use of colour. Accepted in MNRAS
Efficient Parallel Simulations of Asynchronous Cellular Arrays
Creators: name: Lubachevsky, Boris D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: D.1.3; D.4.1; D.4.8; I.6.8

description: A definition for a class of asynchronous cellular arrays is proposed. An example of such asynchrony would be independent Poisson arrivals of cell iterations. The Ising model in the continuous time formulation of Glauber falls into this class. Also proposed are efficient parallel algorithms for simulating these asynchronous cellular arrays. In the algorithms, one or several cells are assigned to a processing element (PE), local times for different PEs can be different. Although the standard serial algorithm by Metropolis, Rosenbluth, Rosenbluth, Teller, and Teller can simulate such arrays, it is usually believed to be without an efficient parallel counterpart. However, the proposed parallel algorithms contradict this belief proving to be both efficient and able to perform the same task as the standard algorithm. The results of experiments with the new algorithms are encouraging: the speed-up is greater than 16 using 25 PEs on a shared memory MIMD bus computer, and greater than 1900 using 2**14 PEs on a SIMD computer. The algorithm by Bortz, Kalos, and Lebowitz can be incorporated in the proposed parallel algorithms, further contributing to speed-up. [In this paper I invented the update-cites-of-local-time-minima parallel simulation scheme. Now the scheme is becoming popular. Many misprints of the original 1987 Complex Systems publication are corrected here.-B.L.]
description: 26 pages, 10 figures
A Two-Level Simulation-Assisted Sequential Distribution System Restoration Model With Frequency Dynamics Constraints
Creators: name: Zhang, Qianzhi
name: Ma, Zixiao
name: Zhu, Yongli
name: Wang, Zhaoyu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper proposes a service restoration model for unbalanced distribution systems and inverter-dominated microgrids (MGs), in which frequency dynamics constraints are developed to optimize the amount of load restoration and guarantee the dynamic performance of system frequency response during the restoration process. After extreme events, the damaged distribution systems can be sectionalized into several isolated MGs to restore critical loads and tripped non-black start distributed generations (DGs) by black start DGs. However, the high penetration of inverter-based DGs reduces the system inertia, which results in low-inertia issues and large frequency fluctuation during the restoration process. To address this challenge, we propose a two-level simulation-assisted sequential service restoration model, which includes a mixed integer linear programming (MILP)-based optimization model and a transient simulation model. The proposed MILP model explicitly incorporates the frequency response into constraints, by interfacing with transient simulation of inverter-dominated MGs. Numerical results on a modified IEEE 123-bus system have validated that the frequency dynamic performance of the proposed service restoration model are indeed improved.
description: Accepted by IEEE Transactions on Smart Grid
The trigger slow control system of the Belle II experiment
Creators: name: Kim, C. -H.
name: Unno, Y.
name: Cheon, B. G.
name: Kim, S. H.
name: Lee, I. S.
name: Koga, T.
name: Lai, Y. -T.
name: Iwasaki, Y.
name: Yamada, S.
name: Nakao, M.
name: Nakazawa, H.
name: Jang, E. -J.
name: Choi, S. -K.
name: Konno, T.
name: Liventsev, D.
name: Park, S. -H.
name: Kwon, Y. -J.
name: Hartbrich, O.
name: Ritzert, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The Belle II experiment at the SuperKEKB $e^{+}e^{-}$ collider in KEK, Japan, started physics data-taking with a complete detector from early 2019 with the primary physics goal of probing new physics in heavy quark and lepton decays. An online trigger system is indispensable for the Belle II experiment to reduce the beam background events associated with high electron and positron beam currents without sacrificing the target physics-oriented events. During the Belle II operation upon beam collision, the trigger system must be consistently controlled and its status must be carefully monitored in the process of data acquisition against unexpected situations. For this purpose, we have developed a slow control system for the Belle II trigger system. Around seventy thousand configuration parameters are saved in the Belle II central database server for every run when a run starts and stops. These parameters play an essential role in offline validation of the quality of runs. Around three thousand real-time variables are stored in the Belle II main archiving server, and the trend of some of these variables are regularly used for online and offline monitoring purposes. Various operator interface tools have been prepared and used. When the configuration parameters are not correctly applied, or some of the processes are unexpectedly terminated, the slow control system detects it, stops the data-taking process, and generates an alarm. In this article, we report how we constructed the Belle II trigger slow control system, and how we successfully managed to operate during its initial stage.
Dissemination and Communication Report - IntelComp
Creators: name: Bethe, Thorben
name: Perez, Sofia
name: Sanmartin, Joseba
name: Soberon, Gonzalo
Publisher: name: Zenodo
Year: 2024

description: This document is the final monitoring report on the execution of the Dissemination and Communication Plan  of the IntelComp project. It describes the channels and materials developed to reach the main target groups of the Plan: Public Administration, Society, Industry and Academia. It also takes stock of the specific actions and events carried out during the project to accomplish the Plan’s objectives: raise awareness of the project; disseminate its results; and initiate the engagement and support of external actors to IntelComp.
Brocke, Edna, Seim, Jürgen: Gottes Augapfel
Creators: name: Hammerstein, Franz Von
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 36 Nr. 2 (1987): Ökumenische Rundschau, Band 36, Heft 2
Inertial range statistics of the Entropic Lattice Boltzmann in 3D turbulence
Creators: name: Buzzicotti, Michele
name: Tauzin, Guillaume
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We present a quantitative analysis of the inertial range statistics produced by Entropic Lattice Boltzmann Method (ELBM) in the context of 3d homogeneous and isotropic turbulence. ELBM is a promising mesoscopic model particularly interesting for the study of fully developed turbulent flows because of its intrinsic scalability and its unconditional stability. In the hydrodynamic limit, the ELBM is equivalent to the Navier-Stokes equations with an extra eddy viscosity term [1]. From this macroscopic formulation, we have derived a new hydrodynamical model that can be implemented as a Large-Eddy Simulation (LES) closure. This model is not positive definite, hence, able to reproduce backscatter events of energy transferred from the subgrid to the resolved scales. A statistical comparison of both mesoscopic and macroscopic entropic models based on the ELBM approach is presented and validated against fully resolved Direct Numerical Simulations (DNS). Besides, we provide a second comparison of the ELBM with respect to the well known Smagorinsky closure. We found that ELBM is able to extend the energy spectrum scaling range preserving at the same time the simulation stability. Concerning the statistics of higher order, inertial range observables, ELBM accuracy is shown to be comparable with other approaches such as Smagorinsky model.
Measurement and Control of Main Spatio-Temporal Couplings in a CPA Laser Chain
Creators: name: Kabacinski, Adeline
name: Oubrerie, Kosta
name: Goddet, Jean-Philippe
name: Gautier, Julien
name: Tissandier, Fabien
name: Kononenko, Olena
name: Tafzi, Amar
name: Leblanc, Adrien
name: Sebban, Stéphane
name: Thaury, Cédric
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report a straightforward method to control main spatio-temporal couplings in a CPA laser chain system using a specially designed chromatic doublet in a divergent beam configuration. The centering of the doublet allows for the control of the spatial chirp of the CPA laser chain, while its longitudinal position in the divergent beam enables the control of the amount of longitudinal chromatism in a wide dynamic range. The performance of this technique is evaluated by measuring main spatio-temporal couplings with a simple method, based on an ultrafast pulse shaper, which allows for a selection of narrow windows of the spectrum.
description: 9 pages, 5 figures 1 supplemental document : 2 pages, 2 figures
Role of an additional interfacial spin-transfer torque for current-driven skyrmion dynamics in chiral magnetic layers
Creators: name: MacKinnon, C. R.
name: Lepadatu, S.
name: Mercer, T.
name: Bissell, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Skyrmions can be driven by spin-orbit torques as a result of the spin Hall effect. Here we model an additional contribution in ultra-thin multilayers, arising from the spin accumulation at heavy metal / ferromagnetic interfaces and observe the effects on a large range of skyrmion diameters. The combination of the interfacial spin-transfer torque and the spin-orbit torque results in skyrmion motion which helps to explain the observation of small skyrmion Hall angles for skyrmion diameters less than 100 nm. We show that this additional term has a significant effect on the skyrmion dynamics and leads to rapidly decreasing skyrmion Hall angles for small skyrmion diameters, as well as a skyrmion Hall angle versus skyrmion velocity dependence nearly independent of the surface roughness characteristics. Also, the effect of various disordered energy landscapes, in the form of surface roughness, on the skyrmion Hall angle and velocity is shown to be largely drive-dependent. Our results show good agreement with those found in experiments thus concluding that the interfacial spin-transfer torque should be included in micromagnetics simulations for the reproduction of experimental results.
description: 28 pages, 9 figures, 1 table
XMM-Newton View of PKS 2155-304: Characterizing the X-ray Variability Properties with EPIC-PN
Creators: name: Zhang, Y. H.
name: Treves, A.
name: Celotti, A.
name: Qin, Y. P.
name: Bai, J. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Starting from XMM-Newton EPIC-PN data, we present the X-ray variability characteristics of PKS 2155-304 using a simple analysis of the excess variance, \xs, and of the fractional rms variability amplitude, fvar. The scatter in \xs\ and \fvar, calculated using 500 s long segments of the light curves, is smaller than the scatter expected for red noise variability. This alone does not imply that the underlying process responsible for the variability of the source is stationary, since the real changes of the individual variance estimates are possibly smaller than the large scatters expected for a red noise process. In fact the averaged \xs and \fvar, reducing the fluctuations of the individual variances, chang e with time, indicating non-stationary variability. Moreover, both the averaged \sqxs (absolute rms variability amplitude) and \fvar show linear correlation with source flux but in an opposite sense: \sqxs correlates with flux, but \fvar anti-correlates with flux. These correlations suggest that the variability process of the source is strongly non-stationary as random scatters of variances should not yield any correlation. \fvar spectra were constructed to compare variability amplitudes in different energy bands. We found that the fractional rms variability amplitude of the source, when significant variability is observed, increases logarithmically with the photon energy, indicating significant spectral variability. The point-to-point variability amplitude may also track this trend, suggesting that the slopes of the power spectral density of the source are energy-independent. Using the normalized excess variance the black hole mass of \pks was estimated to be about $1.45 \times 10^8 M_{\bigodot}$. This is compared and contrasted with the estimates derived from measurements of the host galaxies.
description: Accepted for publication in The Astrophysical Journal
Evaluation of non-structural earthquake damage to buildings in southwestern B.C.
Creators: name: Cook, Shane Edmond
Publisher: name: University of British Columbia
Year: 2009

description: The damage to non-structural building components and contents can constitute a significant portion of the total damage and risk to life due to an earthquake. Despite this, structural effects have been the measure of risk in the majority of regional damage assessment studies. It is the purpose of this thesis to develop a methodology for the evaluation of damages to non-structural building components and contents, that is applicable to southwestern British Columbia, and apply this methodology to a case study region. Existing methodologies that have been developed for use in other regions are reviewed and the methodology to be used in this study is outlined. A classification scheme for non-structural components and building contents is presented as well as damage functions for each nonstructural component class. The damage functions used to perform the assessment are Damage Probability Matrices that relate non-structural damages to earthquake intensities. The nonstructural damages are presented as percentages replacement costs and ground motion intensities are measured in the Modified Mercalli Intensity scale. Lastly, a case study is performed on a building inventory consisting of over 8000 buildings located in the City of New Westminster.
A unified and automated approach to attractor reconstruction
Creators: name: Krämer, K. H.
name: Datseris, G.
name: Kurths, J.
name: Kiss, I. Z.
name: Ocampo-Espindola, J. L.
name: Marwan, N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present a fully automated method for the optimal state space reconstruction from univariate and multivariate time series. The proposed methodology generalizes the time delay embedding procedure by unifying two promising ideas in a symbiotic fashion. Using non-uniform delays allows the successful reconstruction of systems inheriting different time scales. In contrast to the established methods, the minimization of an appropriate cost function determines the embedding dimension without using a threshold parameter. Moreover, the method is capable of detecting stochastic time series and, thus, can handle noise contaminated input without adjusting parameters. The superiority of the proposed method is shown on some paradigmatic models and experimental data from chaotic chemical oscillators.
description: 37 pages, 12 figures
Percolation quantum phase transitions in diluted magnets
Creators: name: Vojta, Thomas
name: Schmalian, Joerg
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that the interplay of geometric criticality and quantum fluctuations leads to a novel universality class for the percolation quantum phase transition in diluted magnets. All critical exponents involving dynamical correlations are different from the classical percolation values, but in two dimensions they can nonetheless be determined exactly. We develop a complete scaling theory of this transition, and we relate it to recent experiments in La$_{2}$Cu$_{1-p}$(Zn,Mg)$_{p}$O$_{4}$. Our results are also relevant for disordered interacting boson systems.
description: 4 pages, 3 eps figures, final version, as published
Spatial-Spectral Joint Detection for Wideband Spectrum Sensing in Cognitive Radio Networks
Creators: name: Quan, Zhi
name: Cui, Shuguang
name: Sayed, Ali. H.
name: Poor, H. Vincent
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Spectrum sensing is an essential functionality that enables cognitive radios to detect spectral holes and opportunistically use under-utilized frequency bands without causing harmful interference to primary networks. Since individual cognitive radios might not be able to reliably detect weak primary signals due to channel fading/shadowing, this paper proposes a cooperative wideband spectrum sensing scheme, referred to as spatial-spectral joint detection, which is based on a linear combination of the local statistics from spatially distributed multiple cognitive radios. The cooperative sensing problem is formulated into an optimization problem, for which suboptimal but efficient solutions can be obtained through mathematical transformation under practical conditions.
description: To appear in the Proceedings of the 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March 30-April 4, 2008
Phrasebook editing: "fishing" through "currents and tides"
Creators: name: Gideon, Sigfrit
name: Rudolph, Johnny (Soni)
name: Drummond, Emily
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: nkr

description: Elicitation to edit a Nukuoro phrasebook, including sections on fishing, sailing and paddling, and currents and tides. Corresponds to pages 102-105 in Notebook 3.
DEATH AND LIFE AFTER ISLAMIC SOURCES
Creators: name: Karadağ, Erdal
Publisher: name: Zenodo
Year: 2024

description: The inherent inability to feel death and the lack of scientific means to test it contribute to the complexity of the matter, thereby giving rise to many hypotheses. To elucidate this matter and resolve any disputes, our research has two primary components. Initially, we conducted a comprehensive analysis of the human population as a whole, as a prerequisite for comprehending the concept of mortality. Next, we elucidate the human's conduct in relation to mortality and their profound vulnerability when confronted with the inevitability of death. Subsequently, we concluded our investigation by scrutinizing the matters pertaining to the demise and the subsequent occurrences. The phenomenon of death has been extensively studied, delineated, and attempted to be comprehended in several scientific disciplines. Across the course of history, many religious beliefs and teachings have given rise to diverse understandings and explanations about the concept of death. The topic of death has been a prominent focus for philosophers and scientists, both in the present century and throughout human history. Individuals' perspectives on mortality differ from one another and might also vary across diverse cultures. Undoubtedly, the Quran's response to the subject of death in Islam has significant importance. Additional components of the thesis will explore the connection between death and related subjects, such as existence in the grave, the apocalypse, judgment, and retribution. Individuals first undergo a condition of disfavor and astonishment when encountering death, but subsequently they acknowledge the circumstances and adjust to their existence. However, without enough expertise and equipment in this field, he may be exposed to mortal danger and experience a decline in his psychological well-being. The Holy Quran cautions individuals about mortality and mentally prepares them for the experience of death and its consequences. Mortality is a formidable challenge; however humanity has been bestowed with the capacity to triumph over this challenge by divine intervention. Initially, our study focused on analyzing the verses in the Quran that introduce and provide descriptions of human beings. In addition, we considered the perspectives of psychologists and sociologists, as well as the methodologies used by Islamic scholars. In the second section, we endeavored to analyze the occurrence of death, the apocalypse, the consequences of the apocalypse, and the depictions of the afterlife as described in the Holy Quran. These investigations will enhance individuals' comprehension of mortality, the purpose of their existence, and their self-perception.
Entropy of shifts on higher-rank graph C*-algebras
Creators: name: Skalski, Adam
name: Zacharias, Joachim
Publisher: name: arXiv
Year: 2006
Subjects: subject: Operator Algebras (math.OA)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 46L55; 37B40

description: Let O_{Lambda} be a higher rank graph C*-algebra of rank r. For every tuple p of non-negative integers there is a canonical completely positive map Phi^p on O_{Lambda} and a subshift T^p on the path space X of the graph. We show that ht(Phi^p)=h(T^p), where ht is Voiculescu's approximation entropy and h the classical topological entropy. For a higher rank Cuntz-Krieger algebra O_M we obtain ht(Phi^p)= log r(M_1^{p_1}M_2^{p_2} ... M_r^{p_r}), r being the spectral radius. This generalises Boca and Goldstein's result for Cuntz-Krieger algebras.
description: 11 pages, revised and corrected version
2023 ICTV/EVBC workshop: virus database overview
Creators: name: Cassman, NA
Publisher: name: Zenodo
Year: 2023

description: Slide deck for the presentation given by Dr. Noriko Cassman on 2 Aug 2023 during the Snakemake workshop portion of the ICTV/EVBC Meeting to Automate Virus Taxonomy in Jena, Germany. The workshop was co-organized by members of the ICTV, EVBC and NFDI4Microbiota.
Growth, strain and spin orbit torques in epitaxial NiMnSb films sputtered on GaAs
Creators: name: Zhao, N.
name: Sud, A.
name: Sukegawa, H.
name: Komori, S.
name: Rogdakis, K.
name: Yamanoi, K.
name: Patchett, J.
name: Robinson, J. W. A.
name: Ciccarelli, C.
name: Kurebayashi, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We report current-induced spin torques in epitaxial NiMnSb films on a commercially available epi-ready GaAs substrate. The NiMnSb was grown by co-sputtering from three targets using optimised parameter. The films were processed into micro-scale bars to perform current-induced spin-torque measurements. Magnetic dynamics were excited by microwave currents and electric voltages along the bars were measured to analyse the symmetry of the current-induced torques. We found that the extracted symmetry of the spin torques matches those expected from spin-orbit interaction in a tetragonally distorted half-Heusler crystal. Both field-like and damping-like torques are observed in all the samples characterised, and the efficiency of the current-induced torques is comparable to that of ferromagnetic metal/heavy metal bilayers.
Trends in Canada's Agricultural Trade and Production, 1959-69: A Statistical Look at Canadian-U.S. Competition
Creators: name: Missiaen, Edmond
name: Missiaen, Edmond
Publisher: name: Unknown
Year: 1970
Subjects: subject: Crop Production/Industries
subject: Food Consumption/Nutrition/Food Safety
subject: International Relations/Trade
subject: Land Economics/Use
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Productivity Analysis
subject: Canada
subject: Prairie Provinces
subject: Wheat
subject: Feed grains
subject: Oilseeds
subject: Tobacco
subject: Agricultural commodities

description: This report provides a statistical review of Canada's role during the past decade as a supplier of agricultural commodities competing with U.S. agricultural commodities. Trade, production, consumption, farm resources and inputs, and grain marketing patterns for relevant agricultural commodities are treated. In 1959-69, wheat and flour dominated Canada's agricultural exports, but tobacco, barley, flaxseed, rapeseed, animal feeds, meat, and live cattle were also important. The Prairie Provinces led in crop production--especially grains and oilseeds.