cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Statistical properties of sampled networks by random walks
Creators: name: Yoon, Sooyeon
name: Lee, Sungmin
name: Yook, Soon-Hyung
name: Kim, Yup
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We study the statistical properties of the sampled networks by a random walker. We compare topological properties of the sampled networks such as degree distribution, degree-degree correlation, and clustering coefficient with those of the original networks. From the numerical results, we find that most of topological properties of the sampled networks are almost the same as those of the original networks for $γ\lesssim 3$. In contrast, we find that the degree distribution exponent of the sampled networks for $γ>3$ somewhat deviates from that of the original networks when the ratio of the sampled network size to the original network size becomes smaller. We also apply the sampling method to various real networks such as collaboration of movie actor, world wide web, and peer-to-peer networks. All topological properties of the sampled networks show the essentially same as the original real networks.
description: 5 pages, 4 figures
Sejong Face Database: A Multi-Modal Disguise Face Database
Creators: name: Cheema, Usman
name: Moon, Seungbin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Commercial application of facial recognition demands robustness to a variety of challenges such as illumination, occlusion, spoofing, disguise, etc. Disguised face recognition is one of the emerging issues for access control systems, such as security checkpoints at the borders. However, the lack of availability of face databases with a variety of disguise addons limits the development of academic research in the area. In this paper, we present a multimodal disguised face dataset to facilitate the disguised face recognition research. The presented database contains 8 facial add-ons and 7 additional combinations of these add-ons to create a variety of disguised face images. Each facial image is captured in visible, visible plus infrared, infrared, and thermal spectra. Specifically, the database contains 100 subjects divided into subset-A (30 subjects, 1 image per modality) and subset-B (70 subjects, 5 plus images per modality). We also present baseline face detection results performed on the proposed database to provide reference results and compare the performance in different modalities. Qualitative and quantitative analysis is performed to evaluate the challenging nature of disguise addons. The dataset will be publicly available with the acceptance of the research article. The database is available at: https://github.com/usmancheema89/SejongFaceDatabase.
description: Database Access Link: https://github.com/usmancheema89/SejongFaceDatabase
Electron transport in armchair single-wall carbon nanotubes
Creators: name: Pozdnyakov, Dmitry
name: Galenchik, Vadim
name: Komarov, Fadei
name: Borzdov, Vladimir
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The rates of electron scattering via phonons in the armchair single-wall carbon nanotubes were calculated by using the improved scattering theory within the tight-binding approximation. Therefore, the problem connected with the discrepancy of the scattering rates calculated in the framework of the classical scattering theory and ones predicted by experimental data was clarified. Then these results were used for the solving of the kinetic Boltzmann equation to describe electron transport properties of the nanotubes. The equation was solved numerically by using both the finite difference approach and the Monte Carlo simulation procedure.
description: 10 pages, 4 figures, accepted for publication in Physica E: Low-Dim. Syst. Nanostr
Analyticity of the SRB measure for a class of simple Anosov flows
Creators: name: Amaricci, A.
name: Bonetto, F.
name: Falco, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We consider perturbations of the Hamiltonian flow associated with the geodesic flow on a surface of constant negative curvature. We prove that, under a small perturbation, not necessarely of Hamiltonian character, the SRB measure associated to the flow exists and is analytic in the strength of the perturbation. An explicit example of "thermostatted" dissipative dynamics is constructed.
description: 23 pages, corrected typos
Bingham Fluid Flow through Oscillatory Porous Plate with Ion-Slip and Hall Current
Creators: name: Mollah, Md. Tusher
name: Islam, Muhammad Minarul
name: Ferdows, Mohammad
name: Alam, Md. Mahmud
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The numerical approach has been performed to study the Bingham fluid flow through an oscillatory porous plate with Ion-Slip and Hall current. Initially, at time; t = 0 both the fluid and the upper plate are at rest. At time; t > 0 the upper plate begins to oscillate in its own plane while the lower plate is stationary. The lower plate temperature is constant while the upper plate temperature has oscillated. A uniform magnetic field is applied perpendicular to the plates. To obtain the dimensionless equations from the governing non-linear partial differential equations, the usual transformations have been used. The explicit finite difference technique has been applied to solve the obtained dimensionless equations. The MATLAB R2015a has been used for numerical simulation. For the accuracy of the numerical technique, the stability and convergence criteria have been discussed and the system has found to be converged for P_r>=0.08, Beta_i>=2, H_a<=20, K_o<=8 (k~=2) and R_e>=0.011 with Beta_e=0.10, E_c=0.10, Delta(Y)=0.05 and Delta(Tau)=0.0001. The steady-state solution has achieved at the dimensionless time=2.00. At the steady-state time, the effect of several parameters on the flow patterns, local shear stress and the Nusselt number have been shown graphically.
A low-noise ferrite magnetic shield
Creators: name: Kornack, T. W.
name: Smullin, S. J.
name: Lee, S. -K.
name: Romalis, M. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Ferrite materials provide magnetic shielding performance similar to commonly used high permeability metals but have lower intrinsic magnetic noise generated by thermal Johnson currents due to their high electrical resistivity. Measurements inside a ferrite shield with a spin-exchange relaxation-free atomic magnetometer reveal a noise level of 0.75 fT Hz^(-1/2), 25 times lower than what would be expected in a comparable mu-metal shield. The authors identify a 1/f component of the magnetic noise due to magnetization fluctuations and derive general relationships for the Johnson current noise and magnetization noise in cylindrical ferromagnetic shields in terms of their conductivity and complex magnetic permeability.
description: 4 pages, 3 figures. Published in Appl. Phys. Lett.; replacement reflects published work
On the Singularities of the Magnon S-matrix
Creators: name: Dorey, Nick
name: Hofman, Diego M.
name: Maldacena, Juan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the analytic structure of the magnon S-matrix in the spin-chain description of planar ${\cal N}=4$ SUSY Yang-Mills/$AdS_{5}\times S^{5}$ strings. Semiclassical analysis suggests that the exact S-matrix must have a large family of poles near the real axis in momentum space. In this article we show that these are double poles corresponding to the exchange of pairs of BPS magnons. Their locations in the complex plane are uniquely fixed by the known dispersion relation for the BPS particles. The locations precisely agree with the recent conjecture for the $S$ matrix by Beisert, Hernandez, Lopez, Eden and Staudacher (hep-th/0609044 and hep-th/0610251). These poles do not signal the presence of new bound states. In fact, a certain non-BPS localized classical solution, which was thought to give rise to new bound states, can actually decay into a pair of BPS magnons.
description: 40 pages, 14 figures; typos corrected, references added
Differential Forms and the Wodzicki Residue for Manifolds with Boundary
Creators: name: Wang, Yong
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In [3], Connes found a conformal invariant using Wodzicki's 1-density and computed it in the case of 4-dimensional manifold without boundary. In [14], Ugalde generalized the Connes' result to $n$-dimensional manifold without boundary. In this paper, we generalize the results of [3] and [14] to the case of manifolds with boundary.
BlocklyQuestionInterfaceWithUserStudy
Creators: name: Xu, Haiqi
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 401302
subject: Geospatial information systems and geospatial data modelling
classificationCode: 460508
subject: Information retrieval and web search
classificationCode: 460208
subject: Natural language processing
classificationCode: 490508
subject: Statistical data science

description: QuestionFormulationInterface includes the HTML and Javascript codes for the Blockly-based interface for geo-analytical question formulation.GeoAnalyticParser interprets geo-analytical questions as concept transformations, calculates question similarities, and calculates information retrieval metrics.UserStudy includes input data collected from the Use study for the Blockly-based question formulation interface, R codes for analyzing data, and output figures and data.
Distribution of magnetic domain pinning fields in GaMnAs ferromagnetic films
Creators: name: Kim, Jungtaek
name: Shin, D. Y.
name: Lee, Sanghoon
name: Liu, X.
name: Furdyna, J. K.
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: Using the angular dependence of the planar Hall effect in GaMnAs ferromagnetic films, we were able to determine the distribution of magnetic domain pinning fields in this material. Interestingly, there is a major difference between the pinning field distribution in as-grown and in annealed films, the former showing a strikingly narrower distribution than the latter. This conspicuous difference can be attributed to the degree of non-uniformity of magnetic anisotropy in both types of films. This finding provides a better understanding of the magnetic domain landscape in GaMnAs that has been the subject of intense debate.
A model study of longshore transport rate
Creators: name: Ametepe, Joseph Kwaku
Publisher: name: University of British Columbia
Year: 2010

description: Theory for across-shore transport as a function of beach slope and sediment size is extended to longshore transport. To test the theory, experimental measurements of longshore transport are required for a range of beach slopes and sediment sizes. Measurements were made of the sand transport caused by waves of different characteristics approaching the toe of an inclined model test beach of variable slope. The initial beach slope was 1 on 9. Three different tests sands of median diameters 0.50mm, 0.85mm and 2.0mm were used as beach material to investigate the probable influence of grain size on the longshore transport rate. Long crested waves generated in a constant depth of water travelled over the beach, shoaled and were refracted before breaking near the shoreline. The breaking action caused the sand to be transported along the shore in the direction of the longshore component of the wave energy flux. The laboratory measurements of the longshore transport are described, and it is shown that, for a given wave energy, transport increases with beach slope. Also, the distribution of the longshore sediment transport across the beach face is shown to be a function of beach slope and sediment size as higher transport rates were recorded for the coarser sands in zones of maximum wave energy dissipation. Based on the streampower approach and the radiation stress concepts, a theoretical model is developed for the estimation of the longshore transport as a function of incident wave height and direction, sediment characteristics and beach slope. The predictions of this model are shown to be in agreement with the experimental measurements.
Drone Control based on Mental Commands and Facial Expressions
Creators: name: Marin, Iuliana
name: Al-Battbootti, Myssar Jabbar Hammood
name: Goga, Nicolae
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: When it is tried to control drones, there are many different ways through various devices, using either motions like facial motion, special gloves with sensors, red, green, blue cameras on the laptop or even using smartwatches by performing gestures that are picked up by motion sensors. The paper proposes a work on how drones could be controlled using brainwaves without any of those devices. The drone control system of the current research was developed using electroencephalogram signals took by an Emotiv Insight headset. The electroencephalogram signals are collected from the users brain. The processed signal is then sent to the computer via Bluetooth. The headset employs Bluetooth Low Energy for wireless transmission. The brain of the user is trained in order to use the generated electroencephalogram data. The final signal is transmitted to Raspberry Pi zero via the MQTT messaging protocol. The Raspberry Pi controls the movement of the drone through the incoming signal from the headset. After years, brain control can replace many normal input sources like keyboards, touch screens or other traditional ways, so it enhances interactive experiences and provides new ways for disabled people to engage with their surroundings.
Corfu 05 lectures - part I: Strings on curved backgrounds
Creators: name: Orlando, Domenico
name: Petropoulos, P. Marios
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In these introductory lectures we summarize some basic facts and techniques about perturbative string theory (sections 1 to 6). These are further developed (sections 7 and 8) for describing string propagation in the presence of gravitational or gauge fields. We also remind some solutions of the string equations of motion, which correspond to remarkable (NS or D) brane configurations. A part II by Emilian Dudas will be devoted to orientifold constructions and applications to string model building.
Three-dimensional magnetic reconnection in particle-in-cell simulations of anisotropic plasma turbulence
Creators: name: Rueda, Jeffersson A. Agudelo
name: Verscharen, Daniel
name: Wicks, Robert T.
name: Owen, Christopher J.
name: Nicolaou, Georgios
name: Walsh, Andrew P.
name: Zouganelis, Ioannis
name: Germaschewski, Kai
name: Domínguez, Santiago Vargas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Space Physics (physics.space-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We use 3D fully kinetic particle-in-cell simulations to study the occurrence of magnetic reconnection in a simulation of decaying turbulence created by anisotropic counter-propagating low-frequency Alfvén waves consistent with critical-balance theory. We observe the formation of small-scale current-density structures such as current filaments and current sheets as well as the formation of magnetic flux ropes as part of the turbulent cascade. The large magnetic structures present in the simulation domain retain the initial anisotropy while the small-scale structures produced by the turbulent cascade are less anisotropic. To quantify the occurrence of reconnection in our simulation domain, we develop a new set of indicators based on intensity thresholds to identify reconnection events in which both ions and electrons are heated and accelerated in 3D particle-in-cell simulations. According to the application of these indicators, we identify the occurrence of reconnection events in the simulation domain and analyse one of these events in detail. The event is related to the reconnection of two flux ropes, and the associated ion and electron exhausts exhibit a complex three-dimensional structure. We study the profiles of plasma and magnetic-field fluctuations recorded along artificial-spacecraft trajectories passing near and through the reconnection region. Our results suggest the presence of particle heating and acceleration related to small-scale reconnection events within magnetic flux ropes produced by the anisotropic Alfvénic turbulent cascade in the solar wind. These events are related to current structures of order a few ion inertial lengths in size.
description: Accepted for publication in J. Plasma Phys
The Kepler problem on 3D spaces of variable and constant curvature from quantum algebras
Creators: name: Ballesteros, Angel
name: Herranz, Francisco J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 37J35; 17B37

description: A quantum sl(2,R) coalgebra (with deformation parameter z) is shown to underly the construction of superintegrable Kepler potentials on 3D spaces of variable and constant curvature, that include the classical spherical, hyperbolic and (anti-)de Sitter spaces as well as their non-constant curvature analogues. In this context, the non-deformed limit z = 0 is identified with the flat contraction leading to the proper Euclidean and Minkowskian spaces/potentials. The corresponding Hamiltonians admit three constants of the motion coming from the coalgebra structure. Furthermore, maximal superintegrability of the Kepler potential on the spaces of constant curvature is explicitly shown by finding an additional constant of the motion coming from an additional symmetry that cannot be deduced from the quantum algebra. In this way, the Laplace-Runge-Lenz vector for such spaces is deduced and its algebraic properties are analysed.
description: 12 pages. Communication presented at the Workshop in honour of Prof. Jose F. Carinena, "Groups, Geometry and Physics", December 9-10, 2005, Zaragoza (Spain)
Effective screening of medium-assisted Van der Waals interactions between embedded particles
Creators: name: Fiedler, Johannes
name: Walter, Michael
name: Buhmann, Stefan Yoshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The effect of an implicit medium on dispersive interactions of particle pairs is discussed and simple expressions for the correction relative to vacuum are derived. We show that a single point Gauss quadrature leads to the intuitive result that the vacuum van der Waals $C_6$ coefficient is screened by the permittivity squared of the environment evaluated near to the resonance frequencies of the interacting particles. This approximation should be particularly relevant if the medium is transparent at these frequencies. In the manuscript, we provide simple models and sets of parameters for commonly used solvents, atoms and small molecules.
Magnetic field dependence of charge stripe order in La2-xBaxCuO4 (x~1/8)
Creators: name: Kim, Jungho
name: Kagedan, A.
name: Gu, G. D.
name: Nelson, C. S.
name: Gog, T.
name: Casa, D.
name: Kim, Young-June
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have carried out a detailed investigation of the magnetic field dependence of charge ordering in La2-xBaxCuO4 (x~1/8) utilizing high-resolution x-ray scattering. We find that the charge order correlation length increases as the magnetic field greater than ~5T is applied in the superconducting phase (T=2K). The observed unusual field dependence of the charge order correlation length suggests that the static charge stripe order competes with the superconducting ground state in this sample.
description: 4 pages, 4 figures
Non-universal gauge boson $Z'$ and the spin correlation of top quark pair production at $e^{-}e^{+}$ colliders
Creators: name: Yue, Chong-Xing
name: Wang, Li-Na
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the off-diagonal basis, we discuss the contributions of the non-universal gauge boson $Z'$ predicted by the topcolor-assisted technicolor ($TC2$) model to the spin configurations and the spin correlation observable of the top quark pair production via the process $e^{-}e^{+}\to t\bar{t}$. Our numerical results show that the production cross sections for the like-spin states, which vanish in the standard model, can be significantly large as $M_{Z'}\approx \sqrt{S}$. With reasonable values of the $Z'$ mass $M_{Z'}$ and the coupling parameter $k_{1}$, $Z'$ exchange can generate large corrections to the spin correlation observable.
description: 16 pages, 5 figures
Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission
Creators: name: Gold, B.
name: Bennett, C. L.
name: Hill, R. S.
name: Hinshaw, G.
name: Odegard, N.
name: Page, L.
name: Spergel, D. N.
name: Weiland, J. L.
name: Dunkley, J.
name: Halpern, M.
name: Jarosik, N.
name: Kogut, A.
name: Komatsu, E.
name: Larson, D.
name: Meyer, S. S.
name: Nolta, M. R.
name: Wollack, E.
name: Wright, E. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new estimate of foreground emission in the WMAP data, using a Markov chain Monte Carlo (MCMC) method. The new technique delivers maps of each foreground component for a variety of foreground models, error estimates of the uncertainty of each foreground component, and provides an overall goodness-of-fit measurement. The resulting foreground maps are in broad agreement with those from previous techniques used both within the collaboration and by other authors. We find that for WMAP data, a simple model with power-law synchrotron, free-free, and thermal dust components fits 90% of the sky with a reduced chi-squared of 1.14. However, the model does not work well inside the Galactic plane. The addition of either synchrotron steepening or a modified spinning dust model improves the fit. This component may account for up to 14% of the total flux at Ka-band (33 GHz). We find no evidence for foreground contamination of the CMB temperature map in the 85% of the sky used for cosmological analysis.
description: accepted by ApJS, 49 pages, 4 tables, 21 figures. PS and PDF versions with high-resolution figures available at http://lambda.gsfc.nasa.gov/product/map/dr3/map_bibliography.cfm
Welding information system : design, operations, methods
Creators: name: Jennings, Daniel Blair
Publisher: name: University of British Columbia
Year: 2010

description: This thesis encompasses a Welding Information System for Design, Operations, and Methods (WISDOM). In essence, the WISDOM project aimed at research and development of an innovative and comprehensive information collection on welding in close cooperation with industry utilizing modern micro-computer techniques of information review, retrieval, storage, updating, and transfer. Emphasis is placed on new and more efficient methods of knowledge communication, pursuing the idea of exploring knowledge (in contrast to rehearsing recipes). The development of this project concentrated on the following three main topics: 1. Background information on steel metallurgy and welding 2. Analysis and Design Methods for Welded Connections 3. Code Requirements of Welds Preliminary research on the WISDOM project involved communications with industry to determine primary objectives. The need for an information system on welding was unquestionably apparent. The knowledge base is supplemented with graphic images and analysis and design programs. It is hoped that the information in this system will be delivered to the engineer in an efficient and useful manner. The priority here is to raise welding awareness while promoting efficient welded design. In addition, we hope that the WISDOM system will close the ever widening gap between the design engineer and the fabricator. In the most general sense, the primary objective of the WISDOM project was to produce an integrated self-paced teaching tool for both engineering professional and student alike. The versatility of the system is maintained by presenting the information in modular form. Screen graphics oriented learning modules encourage the user to become more involved in the learning process than more conventional teaching methods allow. Analysis and design modules promote rapid and efficient connection design in a more consistent and professional manner. A smooth transition from the learning environment to engineering practice is envisioned by providing realistic design tools with a transparent background.
Efficient emulator for solving three-nucleon continuum Faddeev equations with chiral three-nucleon force comprising any number of contact terms
Creators: name: Witała, H.
name: Golak, J.
name: Skibiński, R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We demonstrate a computational scheme which drastically decreases the required time to get theoretical predictions based on chiral two- and three-nucleon forces for observables in three-nucleon continuum. For a three-nucleon force containing N short-range terms all workload is reduced to solving N+1 Faddeev-type integral equations. That done, computation of observables for any combination of strengths of the contact terms is done in a flash. We demonstrate on example of the elastic nucleon-deuteron scattering observables the high precision of the proposed emulator and its capability to reproduce exact results.
description: 13 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:2102.13408
Are the energy and virial routes to thermodynamics equivalent for hard spheres?
Creators: name: Santos, Andres
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The internal energy of hard spheres (HS) is the same as that of an ideal gas, so that the energy route to thermodynamics becomes useless. This problem can be avoided by taking an interaction potential that reduces to the HS one in certain limits. In this paper the square-shoulder (SS) potential characterized by a hard-core diameter $σ'$, a soft-core diameter $σ>σ'$ and a shoulder height $ε$ is considered. The SS potential becomes the HS one if (i) $ε\to 0$, or (ii) $ε\to\infty$, or (iii) $σ'\toσ$ or (iv) $σ'\to 0$ and $ε\to\infty$. The energy-route equation of state for the HS fluid is obtained in terms of the radial distribution function for the SS fluid by taking the limits (i) and (ii). This equation of state is shown to exhibit, in general, an artificial dependence on the diameter ratio $σ'/σ$. If furthermore the limit $σ'/σ\to 1$ is taken, the resulting equation of state for HS coincides with that obtained through the virial route. The necessary and sufficient condition to get thermodynamic consistency between both routes for arbitrary $σ'/σ$ is derived.
description: 10 pages, 4 figures; v2: minor changes; to be published in the special issue of Molecular Physics dedicated to the Seventh Liblice Conference on the Statistical Mechanics of Liquids (Lednice, Czech Republic, June 11-16, 2006)
Pulsar Nulling and Mode Changing
Creators: name: Wang, N.
name: Manchester, R. N.
name: Johnston, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: With its relatively long observation time per pointing, the Parkes multibeam survey was effective in detecting nulling pulsars. We have made 2-hour observations of 23 pulsars which showed evidence for pulse nulling or mode changing in the survey data. Because of the low flux density of these pulsars, in most cases averaging times of between 10 s and 60 s were necessary and so this analysis is insensitive to very short nulls. Seven of the pulsars had null fractions of more than 40% with the largest having a lower limit of 95%. Mode changes were observed in six pulsars with clear relationships between nulling and mode changing in some cases. Combined with earlier results, the data suggest that large null fractions are more related to large characteristic age than to long pulse period. The observations suggest that nulling and mode changing are different manifestations of the same phenomenon.
description: 11 pages, 8 figures, accepted by MNRAS
First Order Plus Fractional Diffusive Delay Modeling: interconnected discrete systems
Creators: name: Juchem, Jasper
name: Chevalier, Amélie
name: Dekemele, Kevin
name: Loccufier, Mia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: 93B30, 26A33, 93A15, 93B11

description: This paper presents a novel First Order Plus Fractional Diffusive Delay (FOPFDD) model, capable of modeling delay dominant systems with high accuracy. The novelty of the FOPFDD is the Fractional Diffusive Delay (FDD) term, an exponential delay of non-integer order $α$, i.e. $e^{-(Ls)^α}$ in Laplace domain. The special cases of $α= 0.5$ and $α= 1$ have already been investigated thoroughly. In this work $α$ is generalized to any real number in the interval $]0,1[$. For $α=0.5$, this term appears in the solution of distributed diffusion systems, which will serve as a source of inspiration for this work. Both frequency and time domain are investigated. However, regarding the latter, no closed-form expression of the inverse Laplace transform of the FDD can be found for all $α$, so numerical tools are used to obtain an impulse response of the FDD. To establish the algorithm, several properties of the FDD term have been proven: firstly, existence of the term, secondly, invariance of the time integral of the impulse response, and thirdly, dependency of the impulse response's energy on $α$. To conclude, the FOPFDD model is fitted to several delay-dominant, diffusive-like resistors-capacitors (RC) circuits to show the increased modeling accuracy compared to other state-of-the-art models found in literature. The FOPFDD model outperforms the other approximation models in accurately tracking frequency response functions as well as in mimicing the peculiar delay/diffusive-like time responses, coming from the interconnection of a large number of discrete subsystems. The fractional character of the FOPFDD makes it an ideal candidate for an approximate model to these large and complex systems with only a few parameters.
description: 16 pages, 9 figures, under review
Spectral functions and optical conductivity of spinless fermions on a checkerboard lattice
Creators: name: Pollmann, F.
name: Fulde, P.
name: Runge, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the dynamical properties of spinless fermions on the checkerboard lattice. Our main interest is the limit of large nearest-neighbor repulsion $V$ as compared with hopping $|t|$. The spectral functions show broad low-energy excitation which are due to the dynamics of fractionally charged excitations. Furthermore, it is shown that the fractional charges contribute to the electrical current density.
description: 9 Pages, 9 Figures
Phase Space Structure in the Solar Neighbourhood
Creators: name: Chakrabarty, Dalia
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the idea that dynamical parameters can be estimated by identifying locations in the solar neighbourhood where simulated velocity distributions match the observed local distribution. Here, the dynamical influence of both the Galactic bar and the outer spiral pattern are taken into account. The Milky Way disc is stirred by analytical potentials that are chosen to represent the two perturbations, the ratio of pattern speeds of which is explored, rather than held constant. The velocity structure of the final configuration is presented as heliocentric velocity distributions at different locations. These model velocity distributions are compared to the observed distribution in terms of a goodness-of-fit parameter that has been formulated here. We monitor the spatial distribution of the maximal value of this parameter, in order to constrain the solar position from a model. Efficiency of a model is based on a study of this distribution as well as on other independent dynamical considerations. We reject the bar only and spiral only models and arrive at the following bar parameters from the bar+spiral simulations: bar pattern speed of 57.4^{+2.8}_{-3.3} km/s/kpc and a bar angle in [0^\circ$, 30^\circ$]. However, extracting information in this way is no longer viable when the dynamical influence of the spiral pattern does not succumb to that of the bar. Orbital analysis indicates that even though the basic bimodality in the local velocity distribution can be attributed to scattering off the Outer Lindblad Resonance of the bar, it is the interaction of irregular orbits and orbits of other resonant families, that is responsible for the other moving groups; it is realised that such interaction increases with the warmth of the background disk.
description: 23 pages, 17 figures, accepted for publication in A&A
Directed diffusion of reconstituting dimers
Creators: name: Barma, Mustansir
name: Grynberg, Marcelo D.
name: Stinchcombe, Robin B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss dynamical aspects of an asymmetric version of assisted diffusion of hard core particles on a ring studied by G. I. Menon {\it et al.} in J. Stat Phys. {\bf 86}, 1237 (1997). The asymmetry brings in phenomena like kinematic waves and effects of the Kardar-Parisi-Zhang nonlinearity, which combine with the feature of strongly broken ergodicity, a characteristic of the model. A central role is played by a single nonlocal invariant, the irreducible string, whose interplay with the driven motion of reconstituting dimers, arising from the assisted hopping, determines the asymptotic dynamics and scaling regimes. These are investigated both analytically and numerically through sector-dependent mappings to the asymmetric simple exclusion process.
description: 10 pages, 6 figures. Slight corrections, one added reference. To appear in J. Phys. Cond. Matt. (2007). Special issue on chemical kinetics
Discrete holomorphic geometry I. Darboux transformations and spectral curves
Creators: name: Bohle, Christoph
name: Pedit, Franz
name: Pinkall, Ulrich
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: Finding appropriate notions of discrete holomorphic maps and, more generally, conformal immersions of discrete Riemann surfaces into 3-space is an important problem of discrete differential geometry and computer visualization. We propose an approach to discrete conformality that is based on the concept of holomorphic line bundles over "discrete surfaces", by which we mean the vertex sets of triangulated surfaces with bi-colored set of faces. The resulting theory of discrete conformality is simultaneously Moebius invariant and based on linear equations. In the special case of maps into the 2-sphere we obtain a reinterpretation of the theory of complex holomorphic functions on discrete surfaces introduced by Dynnikov and Novikov. As an application of our theory we introduce a Darboux transformation for discrete surfaces in the conformal 4-sphere. This Darboux transformation can be interpreted as the space- and time-discrete Davey-Stewartson flow of Konopelchenko and Schief.
Aluminum lactate role in improving hydration and drying behavior of MgO-bonded refractory castables
Creators: name: Fini, D. S.
name: Miguel, V. C.
name: Pinto, V. S.
name: Pandolfelli, V. C.
name: Moreira, M. H.
name: Luz, A. P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Developing MgO-bonded castables is still an important subject for refractory producers and end-users based on the expansive character of the in-situ Mg(OH)2 formation. Considering that magnesia undergoes hydration when exposed to water and the generated hydrated phase needs to be properly accommodated in the resulting microstructure to inhibit the generation of cracks, it is very important to find out alternatives to control the MgO hydration reaction rate. This research investigated the use of aluminum lactate (AL) as a likely additive to change the hydration and drying behavior of vibratable castables bonded with different MgO sources (dead burnt, caustic or fumed one). Firstly, XRD, TG and DSC measurements of magnesia-based aqueous suspensions were evaluated to identify the AL effect on changing the hydration reaction products during the curing and drying steps. After that, Al2O3-MgO refractories were prepared and their flowability, curing behavior, cold flexural strength, apparent porosity, permeability and explosion resistance were evaluated. The results indicated that, instead of Mg(OH)2, Mg6Al2(OH)16(OH)2.4.5H2O/ Mg6Al2(OH)16(CO3).4H2O was the main hydrated phase identified in the AL-containing compositions. Due to this change in the hydration behavior of the refractories, the mixtures prepared with dead-burnt or magnesia fumes plus organic salt presented a longer setting time. Besides that, crack-free samples with improved permeability and green mechanical strength could be obtained when adding 0.5 wt.% or 1.0 wt.% of aluminum lactate to the tested castable compositions. Consequently, 1.0 wt.% of the selected additive favored the design of refractories with enhanced properties and greater spalling resistance, as no explosion could be observed even when subjecting the prepared samples to severe heating conditions (20C/min).
Decaying dark matter in dwarf spheroidal galaxies: Prospects for X-ray and gamma-ray telescopes
Creators: name: Ando, Shin'ichiro
name: Barik, Suvendu K.
name: Feng, Zhuoran
name: Finetti, Marco
name: Chaves, Andreas Guerra
name: Kanuri, Sahaja
name: Kleverlaan, Jorinde
name: Ma, Yixuan
name: Di Serracapriola, Nicolo Maresca
name: Meinema, Matthew S. P.
name: Martinez, Imanol Navarro
name: Ng, Kenny C. Y.
name: Peerbooms, Ebo
name: van Veen, Casper A.
name: Zimmer, Fabian
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Dwarf spheroidal galaxies are dark matter dominated systems, and as such, ideal for indirect dark matter searches. If dark matter decays into high-energy photons in the dwarf galaxies, they will be a good target for current and future generations of X-ray and gamma-ray telescopes. By adopting the latest estimates of density profiles of dwarf galaxies in the Milky Way, we revise the estimates dark matter decay rates in dwarf galaxies; our results are more robust, but weaker than previous estimates. Applying these results, we study the detectability of dark matter decays with X-ray and very-high-energy gamma-ray telescopes, such as eROSITA, XRISM, Athena, HAWC, and CTA. Our projection shows that all of these X-ray telescopes will be able to critically assess the claim of the 7 keV sterile neutrino decays from stacked galaxy clusters and nearby galaxies. For TeV decaying dark matter, we can constrain its lifetime to be longer than $\sim$10$^{27}$-10$^{28}$ s. We also make projections for future dwarf galaxies that would be newly discovered with the Vera Rubin Observatory Legacy Survey of Space and Time, which will further improve the expected sensitivity to dark matter decays both in the keV and PeV mass ranges.
description: 18 pages, 15 figures; comments welcome
[Lord's Prayer in Suisun]
Creators: name: Vallejo, Dr. Platon M.G.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2015
Subjects: subject: pwi
subject: Suisun Patwin language

description: Undated verifax copy of the Lord's Prayer and vocabulary in Suisun. Original dated 1890s and donated to the California Department of Natural Resources in 1953. Includes undated note from Francis A. Riddell to Mary Haas.
SN 2004aw: Confirming Diversity of Type Ic Supernovae
Creators: name: Taubenberger, S.
name: Pastorello, A.
name: Mazzali, P. A.
name: Valenti, S.
name: Pignata, G.
name: Sauer, D. N.
name: Arbey, A.
name: Bärnbantner, O.
name: Benetti, S.
name: Della Valle, A.
name: Deng, J.
name: Elias-Rosa, N.
name: Filippenko, A. V.
name: Foley, R. J.
name: Goobar, A.
name: Kotak, R.
name: Li, W.
name: Meikle, P.
name: Mendez, J.
name: Patat, F.
name: Pian, E.
name: Ries, C.
name: Ruiz-Lapuente, P.
name: Salvo, M.
name: Stanishev, V.
name: Turatto, M.
name: Hillebrandt, W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Optical and near-infrared observations of the Type Ic supernova (SN) 2004aw are presented, obtained from day -3 to day +413 with respect to the B-band maximum. The photometric evolution is characterised by a comparatively slow post-maximum decline of the light curves. The peaks in redder bands are significantly delayed relative to the bluer bands, the I-band maximum occurring 8.4 days later than that in B. With an absolute peak magnitude of -18.02 in the V band the SN can be considered fairly bright, but not exceptional. This also holds for the U through I bolometric light curve, where SN 2004aw has a position intermediate between SNe 2002ap and 1998bw. Spectroscopically SN 2004aw provides a link between a normal Type Ic supernova like SN 1994I and the group of broad-lined SNe Ic. The spectral evolution is rather slow, with a spectrum at day +64 being still predominantly photospheric. The shape of the nebular [O I] 6300,6364 line indicates a highly aspherical explosion. Helium cannot be unambiguously identified in the spectra, even in the near-infrared. Using an analytical description of the light curve peak we find that the total mass of the ejecta in SN 2004aw is 3.5-8.0 M_Sun, significantly larger than in SN 1994I, although not as large as in SN 1998bw. The same model suggests that about 0.3 M_Sun of {56}Ni has been synthesised in the explosion. No connection to a GRB can be firmly established.
description: 22 pages, 15 figures, 6tables, LaTeX, MNRAS online-early, references and affiliations updated, style corrections
The organization of cloud-scale gas density structure: high resolution CO vs. 3.6 $μ$m brightness contrasts in nearby galaxies
Creators: name: Meidt, Sharon E.
name: Leroy, Adam K.
name: Querejeta, Miguel
name: Schinnerer, Eva
name: Sun, Jiayi
name: van der Wel, Arjen
name: Emsellem, Eric
name: Henshaw, Jonathan
name: Hughes, Annie
name: Kruijssen, J. M. Diederik
name: Rosolowsky, Erik
name: Schruba, Andreas
name: Barnes, Ashley
name: Bigiel, Frank
name: Blanc, Guillermo A.
name: Chevance, Melanie
name: Cao, Yixian
name: Dale, Daniel A.
name: Faesi, Christopher
name: Glover, Simon C. O.
name: Grasha, Kathryn
name: Groves, Brent
name: Herrera, Cinthya
name: Klessen, Ralf S.
name: Kreckel, Kathryn
name: Liu, Daizhong
name: Pan, Hsi-An
name: Pety, Jerome
name: Saito, Toshiki
name: Usero, Antonio
name: Watkins, Elizabeth
name: Williams, Thomas G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this paper we examine the factors that shape the distribution of molecular gas surface densities on the 150 pc scale across 67 morphologically diverse star-forming galaxies in the PHANGS-ALMA CO (2-1) survey. Dividing each galaxy into radial bins, we measure molecular gas surface density contrasts, defined here as the ratio between a fixed high percentile of the CO distribution and a fixed reference level in each bin. This reference level captures the level of the faint CO floor that extends between bright filamentary features, while the intensity level of the higher percentile probes the structures visually associated with bright, dense ISM features like spiral arms, bars, and filaments. We compare these contrasts to matched percentile-based measurements of the 3.6 $μ$m emission measured using Spitzer/IRAC imaging, which trace the underlying stellar mass density. We find that the logarithms of CO contrasts on 150 pc scales are 3-4 times larger than, and positively correlated with, the logarithms of 3.6 $μ$m contrasts probing smooth non-axisymmetric stellar bar and spiral structures. The correlation appears steeper than linear, consistent with the compression of gas as it flows supersonically in response to large-scale stellar structures, even in the presence of weak or flocculent spiral arms. Stellar dynamical features appear to play an important role in setting the cloud-scale gas density in our galaxies, with gas self-gravity perhaps playing a weaker role in setting the 150 pc-scale distribution of gas densities.
description: Accepted for publication in ApJ, 16 pages, 7 figures
Additional file 8 of A novel method for controlling unobserved confounding using double confounders
Creators: name: Liu, Lu
name: Hou, Lei
name: Yu, Yuanyuan
name: Liu, Xinhui
name: Sun, Xiaoru
name: Yang, Fan
name: Wang, Qing
name: Jing, Ming
name: Xu, Yeping
name: Li, Hongkai
name: Xue, Fuzhong
Publisher: name: figshare
Year: 2020
Subjects: subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Environmental Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Plant Biology

description: Additional file 8 : Figure S5 The Simulation B2 result. Results shows the estimated biases, SE and MSE from the 3 models for varied effects (a) of C1 on X, (b) the interaction effect of C1 and C2 on X, (c) U on X.
Chern-Connes Character for the Invariant Dirac Operator in Odd Dimensions
Creators: name: Wang, Yong
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics

description: In this paper we give a proof of the Lefschetz fixed point formula of Freed$^{\rm [1]}$ for an orientation-reversing involution on an odd dimensional spin manifold by using the direct geometric method introduced in [2] and then we generalize this formula under the noncommutative geometry framework.