cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tendency to occupy a statistically dominant spatial state of the flow as a driving force for turbulent transition
Creators: name: Chekmarev, Sergei F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The transition from laminar to turbulent fluid motion occurring at large Reynolds numbers is generally associated with the instability of the laminar flow. On the other hand, since the turbulent flow characteristically appears in the form of spatially localized structures (e.g., eddies) filling the flow field, a tendency to occupy such a structured state of the flow cannot be ruled out as a driving force for turbulent transition. To examine this possibility, we propose a simple analytical model that treats the flow as a collection of localized spatial structures, each of which consists of elementary cells in which the behavior of the particles (atoms or molecules) is uncorrelated. This allows us to introduce the Reynolds number, associating it with the ratio between the total phase volume for the system and that for the elementary cell. Using the principle of maximum entropy to calculate the most probable size distribution of the localized structures, we show that as the Reynolds number increases, the elementary cells group into the localized structures, which successfully explains turbulent transition and some other general properties of turbulent flows. We show that the basic assumptions underlying the model, i.e. that the particles are indistinguishable and elementary volumes of phase space exist in which the state of the particles is uncertain, are involved in the derivation of the Navier-Stokes equation. Taking into account that the model captures essential features of turbulent flows, this suggests that the driving force for the turbulent transition is basically the same as in the present model, i.e. the tendency of the system to occupy a statistically dominant state plays a key role. The instability of the flow at high Reynolds numbers can then be a mechanism to initiate structural rearrangement of the flow to find this state.
description: 9 pages, 6 figures; the text of the paper as it is published in Chaos 23 (2013) 013144
Application of the Time Method for Studying Linear Reproducing Systems for Assessing the Dynamic Accuracy of Devices Based on Magnetoelectric Systems
Creators: name: Sytnik, Oleksandr
name: Sagatov, Miraziz
name: Klyuchka, Konstantin
name: Protasov, Sergey
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: 004

description: For the successful use of magnetoelectric measuring systems, an important point is the possibility of assessing their accuracy in a dynamic mode of operation. To obtain such estimates, methods based on frequency transformations and, accordingly, analysis of the composition of the spectral components of the currents of the interacting circuit and the magnetic field are traditionally used. At the same time, frequency methods have a number of limitations, in particular, due to the finiteness of the number of terms of the Fourier series in the analysis of periodic functions of time, as well as some other limitations when using the Fourier integral for non-periodic functions. In addition, there are certain limitations when using the well-known complex-spectral method and the method of typical effects. In the presented article, in addition to the indicated methods, it is proposed to consider the possibility of using a temporary research method to assess the dynamic properties of magnetoelectric systems. Also, as an example, the article presents an analysis of the dynamic properties of a magnetoelectric measuring system with electromagnetic damping, which can be extended to more complex measuring systems of this type.
Capitulares. El Arte en letras
Creators: name: López Pérez, Alexandra
Publisher: name: CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI)
Year: 2019
Subjects: Patrimonio
Divulgación
Digitalización
Archivos
Bibliotecas
Simurg

description: Trabajo que aúna, bajo un mismo marco temático, obras diversas para crear, en relación con la visión museística de los fondos, exposiciones temporales virtuales en el portal Simurg sobre el acervo patrimonial que poseen las Bibliotecas y los Archivos del CSIC.
description: Tal vez nada llame tanto la atención de algunos documentos, ya sean manuscritos o impresos, como las hermosas letras de comienzo de capítulo o sección, llamadas Capitulares. Sin embargo, estas letras, ricamente decoradas e iluminadas, más allá del fin estético que alcanzaron, pretendían servir, fundamentalmente, como apoyo a la lectura.
Evaluation of LoRaWAN’s Static and Dynamic Capabilities and its Limitations for IoT Applications
Creators: name: Trendov, Simeon
name: Zadoienko, Bohdan
name: Siemens, Eduard
name: Kachan, Dmitry
name: Kalendar, Marija
name: Gering, Maksim
name: Maksymov, Sergii
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: DDC::0** Informatik, Informationswissenschaft, allgemeine Werke::00* Informatik, Wissen, Systeme::004 Datenverarbeitung; Informatik

description: This paper is a study of connection parameters of Long Range Wide Area Networks (LoRaWAN) for reliable and robust data communication. It also seeks to highlight the limitations and shortcomings of the LoRaWAN technology, with the goal of identifying areas for improvement. The primary goal is to investigate how particular network parameters affect communication and message transmission. The experimental setup consists of a gateway and two end nodes. The maximum range between the end device and the gateway was tested in a free field in which a stable communication is possible. Furthermore, the connection between the gateway and the endpoints was evaluated at various movement speeds. Additionally examined in a laboratory environment were the roundtrip time, the uplink, delay and downlink, and the received signal strength indicator according to the used transmission power, packet size and the spreading factor. The maximum packet sizes for each spreading factor were also tested.
The application of multivariate statistical methods in ecotoxicology and environmental biochemistry
Creators: name: Falfushynska, Halina
name: Lushchak, Oleg
name: Siemens, Eduard
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2022
Subjects: subject: 004

description: Pesticide pollution of surface- and groundwater are a subject of national importance indeed. However, far too little attention has been paid to find out suitable protocols and algorithms for ecotoxicological data analysis and generalisation. The aim of the present study was to implement Multivariate statistical analysis techniques for prediction of toxicity level of widely-used organophosphate pesticides to living organisms and find out the most appropriate statistical technique out of implemented to integrate biological data. The generalization of the results of biochemical and physiological easurements in zebrafish, Daphnia and Drosophila exposed to widely-used pesticides namely chlorpyrifos, roundup, and malathion have been done using principal component analysis, linear discriminant analysis and classification and regression tree analysis. All of three applied multivariate statistical techniques claimed chlorpyrifos to be the most toxic pesticides out of tested based on responses of living organisms. The importance of battery of biomarkers for risk assessment when compare to individual indices was proved using classification and regression tree analysis and discriminant analysis and daphnia’s protein carbonyls level and zebrafish’s lactate dehydrogenase activity pertain to the most sensitive indices for group distinguishing. We propose to combine the most widely used in life sciences Principal Component Analysis with classification and regression tree analysis and discriminant analysis to better highlight the important biological entities and reveal insightful patterns in the data.
Deterministic remote entanglement of superconducting circuits through microwave two-photon transitions
Creators: name: Campagne-Ibarcq, P.
name: Zalys-Geller, E.
name: Narla, A.
name: Shankar, S.
name: Reinhold, P.
name: Burkhart, L. D.
name: Axline, C. J.
name: Pfaff, W.
name: Frunzio, L.
name: Schoelkopf, R. J.
name: Devoret, M. H.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Large-scale quantum information processing networks will most probably require the entanglement of distant systems that do not interact directly. This can be done by performing entangling gates between standing information carriers, used as memories or local computational resources, and flying ones, acting as quantum buses. We report the deterministic entanglement of two remote transmon qubits by Raman stimulated emission and absorption of a traveling photon wavepacket. We achieve a Bell state fidelity of 73 %, well explained by losses in the transmission line and decoherence of each qubit.
Julio Cortázar ou les Labyrinthes pour Manuel
Creators: name: Jacques, Bourlez
name: Bourlez, Jacques
name: Bauduin, Jacques
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2021
Subjects: Literatura argentina
Pensamiento político
Biografía
Creación
Escritura
Lenguaje
Revolución cubana
"El libro de Manuel"
"Los Premios"
"Rayuela"
"62 Modelo para armar"

description: Síntesis del programa “Rencontre”, producido por Jacques Bourlez y realizado por Jacques Bauduin, dedicado a Julio Cortázar, emitido el 18 de enero de 1975. Programa de la Radio Diffusion Télévision Belge – Institut des Emissions Françaises – Centre de Production du Hainaut (Radio Difusión Televisión Belga – Instituto de las Emisiones Francesas – Centro de Producción del Henao).
description: Notas: Dos ejemplares conservados.
description: Source: Num.Ref. : JC-CAR-35.004
description: Source: Localización del archivo: Centre de Recherches Latino-Américaines (CRLA–Archivos, ITEM UMR8132). MSHS - Bât. A5, 1er étage 5 rue Théodore Lefebvre - TSA21103. 86073 Poitiers cedex 9.
Perturbations In A Non-Uniform Dark Energy Fluid: Equations Reveal Effects of Modified Gravity and Dark Matter
Creators: name: Halle, Anaelle
name: Zhao, HongSheng
name: Li, Baojiu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a unified single-field description of the galactic Dark Matter and various uniform scalar fields for the inflation and cosmological constant. The two types of effects could originate from a fluid of both spatially and temporally varying Vacuum Energy if the vacuum has an uneven pressure caused by a photon-like vector field (of perhaps an unstable massive boson). We propose a most general Lagrangian with a {\bf N}on-{\bf u}niform Cosmological Constant for this vacuum fluid (dubbed as a Nu-Lambda fluid), working within the framework of Einsteinian gravity. This theory includes a continuous spectrum of plausible dark energy theories and gravity theories, e.g., inflation, quintessence, k-essence, f(R), Generalized Einstein-Aether f(K), MOND, TeVeS, BSTV etc. theories. It also suggests new models such as a certain f(K+R) model, which suggests intriguing corrections to MOND depending of redshift and density. Some specific constructions of the Nu-Lambda fluid (e.g., Zhao's V-$Λ$ model) closely resemble the $Λ$CDM cosmology on large scale, but fit galaxy rotation curves as good as MOND. Perturbed Einstein Equations in a simple $f(K_4)$ model are solvable and show effects of a DM coupled to DE. Incorporating the perturbation equations here into standard simulations for cosmological structure growth offers a chance to falsify examples of the Nu-Lambda theories.
description: typos corrected and expanded to 25p, added DM-DE coupling effects in f(K4) model. ApJ Supplement accepted
TOI-1431b/MASCARA-5b: An Ultra-hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars
Creators: name: Addison, Brett
name: Knudstrup, Emil
name: Wong, Ian
name: Hebrard, Guillaume
name: Dorval, Patrick
name: Snellen, Ignas
name: Albrecht, Simon
name: Almenara, Jose-Manuel
name: Boisse, Isabelle
name: Bonfils, Xavier
Publisher: name: Zenodo
Year: 2021
Subjects: Exoplanets
Ultra-hot Jupiter
Phase curve
Radial velocity
secondary eclipse
Thermal emissions

description: Here I present the discovery of an ultra-hot Jupiter, TOI-1431b/MASCARA-5b, detected by TESS and MASCARA. Radial velocity measurements with SONG, SOPHIE, FIES, NRES, and EXPRES confirms the planet candidate with a reflex motion of K=294.1±1.1m/s. A joint analysis of the photometry and RVs gives TOI-1431b a mass of Mp=3.14±0.19MJ, an inflated radius of Rp=1.51±0.06RJ (16.9±0.7Re), and an orbital period of P~2.65d. The planet orbits a bright (V=8.05mag), young (~290Myr), and hot (Teff~7700K) Am type star. Using TESS photometry, we were able to measure the planet's thermal emissions in the red-optical from the full phase curve and secondary eclipse, allowing us to determine the dayside and nightside temperature of its atmosphere as Tday=2983±68K and Tnight=2556±65K. The planet's low day/night temperature contrast (~400K) suggests very efficient heat transport between the dayside and nightside hemispheres. Given the host star brightness, the planet is ideal for intensive atmospheric characterization through transmission and emission spectroscopy from space missions such as JWST and ARIEL.
description: {"references": ["Addison, B. C., et al. 2021, arXiv:2104.12078", "Parmentier, V., et al. 2018, A&A, 617, 110", "Talens, G. J. J., et al. 2017, A&A, 601, 11", "Ricker, G. R., et al. 2015, JATIS, 1, 014003", "Gunther, M. N. & Daylan, T., 2021, ApJS, 254, 13", "Eastman, J. D., et al. 2019, arXiv:1907.09480", "Renson, P. & Manfroid, J., 2009, A&A, 498, 961", "Stangret, M., et al. 2021, arXiv:2104.12414"]}
Supersymmetric Runge-Lenz-Pauli vector for Dirac vortex in topological insulators and graphene
Creators: name: Lu, Chi-Ken
name: Herbut, Igor F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Dirac mass-vortex at the surface of a topological insulator or in graphene is considered. Within the linear approximation for the vortex amplitude's radial dependence, the spectrum is a series of degenerate bound states, which can be classified by a set of accidental SU(2) and supersymmetry generators (I. F. Herbut and C.-K. Lu, Phys. Rev. B 83 125412 (2011)). Here we discuss further the properties and manifestations of the supersymmetry of the vortex Hamiltonian, and point out some interesting analogies to the Runge-Lenz-Pauli vector in the non-relativistic hydrogen atom. Symmetry breaking effects due to a finite chemical potential, and the Zeeman field are also analyzed. We find that a residual accidental degeneracy remains only in the special case of equal magnitudes of both terms, whereas otherwise it becomes removed entirely.
description: revised version with added reference and a new paragraph on interpretation of two-velocity Weyl fermions realized in 2D optical lattice; to appear in J Phys A
MPEC 2024-N68 : 2024 NG1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 NG1

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Forecasting Solar Flares Using Magnetogram-based Predictors and Machine Learning
Creators: name: Florios, Kostas
name: Kontogiannis, Ioannis
name: Park, Sung-Hong
name: Guerra, Jordan A.
name: Benvenuto, Federico
name: Bloomfield, D. Shaun
name: Georgoulis, Manolis K.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We propose a forecasting approach for solar flares based on data from Solar Cycle 24, taken by the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) mission. In particular, we use the Space-weather HMI Active Region Patches (SHARP) product that facilitates cut-out magnetograms of solar active regions (AR) in the Sun in near-real-time (NRT), taken over a five-year interval (2012 - 2016). Our approach utilizes a set of thirteen predictors, which are not included in the SHARP metadata, extracted from line-of-sight and vector photospheric magnetograms. We exploit several Machine Learning (ML) and Conventional Statistics techniques to predict flares of peak magnitude >M1 and >C1, within a 24 h forecast window. The ML methods used are multi-layer perceptrons (MLP), support vector machines (SVM) and random forests (RF). We conclude that random forests could be the prediction technique of choice for our sample, with the second best method being multi-layer perceptrons, subject to an entropy objective function. A Monte Carlo simulation showed that the best performing method gives accuracy ACC=0.93(0.00), true skill statistic TSS=0.74(0.02) and Heidke skill score HSS=0.49(0.01) for >M1 flare prediction with probability threshold 15% and ACC=0.84(0.00), TSS=0.60(0.01) and HSS=0.59(0.01) for >C1 flare prediction with probability threshold 35%.
description: Accepted for publication by Solar Physics
Autonomous Solar Power Plant for Individual use Simulation in LTspice Software Package Booster Voltage Converter
Creators: name: Zikrillayev, Nurullo
name: Saitov, Elyor
name: Toshov, Javokhir
name: Akhmedov, Usmonjon
name: Muradov, Batir
name: Muxtorov, Doston
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: 004

description: This work discusses the development of portable and inexpensive solar stations with low power, which are of great interest to farmers, summer residents, geologists, and travelers. The main focus is to ensure the reliability of the installations during transportation in various conditions, convenience and ease of operation, as well as ensuring the minimum size, weight, and reasonable price. The widespread use of alternative energy sources, particularly solar power plants, can save natural resources, improve the ecology of the habitat, reduce carbon dioxide emissions, and stimulate the training of specialists in the field of alternative energy sources. The purpose of this work is the development of portable solar stations that provide lighting for at least 8 hours, charging cell phones, and which are convenient for transportation. The work discusses the use of a DC voltage converter as an intermediate link between the solar battery and the autonomous voltage inverter, which provides high efficiency with a minimum of power elements and minimized weight and size.
A central circuit of the mind
Creators: name: Anderson, John R.
name: Fincham, Jon
name: Yulin  Qin
name: Stocco, Andrea
Publisher: name: Carnegie Mellon University
Year: 2008
Subjects: subject: 170199 Psychology not elsewhere classified
subject: FOS: Psychology

description: The methodologies of cognitive architectures and functional magnetic resonance imaging can mutually inform each other. For example, four modules of the ACT-R (adaptive control of thought – rational) cognitive architecture have been associated with four brain regions that are active in complex tasks. Activity in a lateral inferior prefrontal region reflects retrieval of information in a declarative module; activity in a posterior parietal region reflects changes to problem representations in an imaginal module; activity in the anterior cingulate cortex reflects the updates of control information in a goal module; and activity in the caudate nucleus reflects execution of productions in a procedural module. Differential patterns of activation in such central regions can reveal the time course of different components of complex cognition.
Boltzmann limit and quasifreeness for a homogenous Fermi gas in a weakly disordered random medium
Creators: name: Chen, Thomas
name: Sasaki, Itaru
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81T08, 81T18, 82C10,82C44

description: We discuss some basic aspects of the dynamics of a homogenous Fermi gas in a weak random potential, under negligence of the particle pair interactions. We derive the kinetic scaling limit for the momentum distribution function with a translation invariant initial state and prove that it is determined by a linear Boltzmann equation. Moreover, we prove that if the initial state is quasifree, then the time evolved state, averaged over the randomness, has a quasifree kinetic limit. We show that the momentum distributions determined by the Gibbs states of a free fermion field are stationary solutions of the linear Boltzmann equation; this includes the limit of zero temperature.
description: AMS Latex, 26 pages. 2 figures. References added, minor typos corrected
Additional file 8 of Evolution of PHAS loci in the young spike of Allohexaploid wheat
Creators: name: Zhang, Rongzhi
name: Huang, Siyuan
name: Li, Shiming
name: Song, Guoqi
name: Li, Yulian
name: Li, Wei
name: Li, Jihu
name: Gao, Jie
name: Gu, Tiantian
name: Li, Dandan
name: Zhang, Shujuan
name: Li, Genying
Publisher: name: figshare
Year: 2020
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Environmental Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Developmental Biology
subject: Marine Biology
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional file 8: Supplementary Figure 8. The distribution of miR2118 (red lines) and miR2275 (blue lines) in the AA (A) and DD (B) genomes.
Breves notas históricas sobre la transformación en los hábitos de lectura y en la concepción bibliotecaria
Creators: name: López Pérez, Alexandra
Publisher: name: CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI)
Year: 2019
Subjects: Patrimonio
Divulgación
Digitalización
Archivos
Bibliotecas
Simurg

description: Trabajo que aúna, bajo un mismo marco temático, obras diversas para crear, en relación con la visión museística de los fondos, exposiciones temporales virtuales en el portal Simurg sobre el acervo patrimonial que poseen las Bibliotecas y los Archivos del CSIC.
description: Las salas de lectura no siempre han sido lugares de recogimiento y lectura intimista e individual. De hecho, ha habido tiempos en que existieron bibliotecas sin salas de lectura; o la consulta de libros se realizó sobre pupitres y atriles dispuestos en estanterías con el fin de permitir la lectura… de pie.
MINERVA-Australis: Two years of TESS follow-up
Creators: name: Wittenmyer, Robert
name: Zhou, George
name: Huang, Chelsea
name: Horner, Jonathan
name: Ballard, Sarah
name: Bedding, Tim
name: Bowler, Brendan
name: Kane, Stephen
name: Kielkopf, John
name: Liu, Huigen
name: Plavchan, Peter
name: Shporer, Avi
name: Tinney, C.G.
name: Zhang, Hui
name: Wright, Duncan
Publisher: name: Zenodo
Year: 2021
Subjects: Exoplanets
Radial Velocity
Photometry
Memes

description: MINERVA-Australis at the University of Southern Queensland's Mount Kent
 Observatory is the only southern hemisphere precise radial velocity
 facility wholly dedicated to follow-up of TESS planets.
 MINERVA-Australis is a partnership between MIT, UNSW Sydney, George
 Mason University, University of Louisville, Nanjing University,
 UC-Riverside, University of Texas, and the University of Florida.
 Observing time is also available to the US community via NSF NOIRLab
 proposal calls. Being fully robotic, we have been unaffected by
 Covid-19 closures. We have contributed data to the validation of 23
 TESS planets. I give an overview and update of operations, highlighting
 our recent mass measurements for TOI-778 and TOI-1842. I also describe
 our new photometric capabilities, aiming to validate small TESS planets
 and to rescue planets from ephemeris erosion.
Late-time Kerr tails revisited
Creators: name: Burko, Lior M.
name: Khanna, Gaurav
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The decay rate of late time tails in the Kerr spacetime have been the cause of numerous conflicting results, both analytical and numerical. In particular, there is much disagreement on whether the decay rate of an initially pure multipole moment ${\ell}$ is according to $t^{-(2{\bar\ell}+3)}$, where ${\bar\ell}$ is the least multipole moment whose excitation is not disallowed, or whether the decay rate is according to $t^{-n}$, where $n=n({\ell})$. We do careful 2+1D numerical simulations, and explain the various results. In particular, we show that pure multipole outgoing initial data in either Boyer--Lindquist on ingoing Kerr coordinates on the corresponding slices lead to the same late time tail behavior. We also show that similar initial data specified in terms of the Poisson spherical coordinates lead to the simpler $t^{-(2{\bar\ell}+3)}$ late time tail. We generalize the rule $n=n({\ell})$ to subdominant modes, and also study the behavior of non--axisymmetric initial data. We discuss some of the causes for possible errors in 2+1D simulations, demonstrate that our simulations are free of those errors, and argue that some conflicting past results may be attributed to them.
description: 16 pages, 26 figures, 2 tables; Many changes compared with previous version
Permeability of porous foamy materials
Creators: name: Langlois, V.
name: Trinh, V. H.
name: Lusso, C.
name: Perrot, C.
name: Chateau, X.
name: Khidas, Y.
name: Pitois, O.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In this paper, we study the effects of both the amount of open cell walls and their aperture sizes on solid foams permeability. FEM flow simulations are performed at both pore and macroscopic scales. For foams with fully interconnected pores, we obtain a robust power-law relationship between permeability and membrane aperture size. This result owns to the local pressure drop mechanism through the membrane aperture as described by Sampson for fluid flow through a circular orifice in a thin plate. Based on this local law, pore-network simulation of simple flow is used and is shown to reproduce successfully FEM results. This low computational cost method allowed to study in detail the effects of the open wall amount on percolation, percolating porosity and permeability. A model of effective permeability is proposed and shows ability to reproduce the results of network simulations. Finally, an experimental validation of the theoretical model on well controlled solid foam is presented.
description: 26 pages, 15 figures
Infinitesimal propagation equation for decoherence of an OAM entangled biphoton in atmospheric turbulence
Creators: name: Roux, Filippus S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive a first order differential equation for the decoherence of an orbital angular momentum entangled biphoton state propagating through a turbulent atmosphere. The derivation is based on the distortion that orbital angular momentum states experience due to propagation through a thin sheet of turbulent atmosphere. This distortion is treated as an infinitesimal transformation leading to a first order differential equation, which we call an infinitesimal propagation equation. The equation is applied to a simple qubit case to show how the entanglement decays.
description: 12 pages, 3 figures, expanded version of arXiv:1009.1956. Minor corrections to improve clarity
title: ADCO, Grènetier de Cîteaux : comptes (1497-1504) (11 H 1172), f. 00375
Creators: name: de la Côte-d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CBMA/CG21/F.PETOT/2019
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: comptes

description: Grènetier de Cîteaux : comptes (1497-1504), Archives départementales de la Côte-d'Or, (11 H 1172). Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Grènetier de Cîteaux : comptes (1497-1504), Archives départementales de la Côte-d'Or, (11 H 1172), f. 00375, in Projet CBMA - Corpus Burgundiae Medii Aevi \[Ressource en ligne\], https:// manuscrits.cbma-project.eu/
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
Comparative Analysis of Machine Learning Models for Diabetes Prediction
Creators: name: Stojanoski, Zoran
name: Kalendar, Marija
name: Gjoreski, Hristijan
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: 004

description: This paper focuses on analyzing the benchmark Diabetes dataset which consists of eight commonly measured characteristics. The goal of the study is to present comparative analysis of six machine learning models that predict diabetes, as well as various preprocessing techniques (under-over sampling, feature standardization). The study investigates various approaches and presents results demonstrating that machine learning algorithms can achieve high accuracy results for diabetes prediction, enabling early detection and better outcomes for patients. The paper shows that ensemble learning methods, such as Extra Trees Classifier and Random Forest Classifier, along with appropriate data pre-processing techniques, can lead to 86% accuracy in diabetes prediction classification problems. The paper highlights the potential for machine learning to play a valuable role in the prediction and management of diabetes, leading to improved quality of life and health outcomes for patients.
Perturbative QCD Calculations of Elliptic Flow and Shear Viscosity in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV
Creators: name: Xu, Zhe
name: Greiner, Carsten
name: Stoecker, Horst
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The elliptic flow $v_2$ and the ratio of the shear viscosity over the entropy density, $η/s$, of gluon matter are calculated from the perturbative QCD (pQCD) based parton cascade Boltzmann approach of multiparton scatterings. For Au+Au collisions at $\sqrt{s}=200$A GeV the gluon plasma generates large $v_2$ values measured at the BNL Relativistic Heavy Ion Collider. Standard pQCD yields $η/s\approx 0.08-0.15$ as small as the lower bound found from the anti-de Sitter/conformal field theory conjecture.
description: 4 pages, 6 figures, new results added in Figs 1, 2, and 3, version published in PRL
Picturing a home: A new perspective on home-making through photo-elicitation
Creators: Alexandra Stout
Damian Collins
Publisher: name: University of Alberta Library
Year: 2024

The photo-elicitation method can provide rich insights into homemaking – the process whereby residents use, modify and personalize domestic space. However, previous studies have prioritized the words of participants, gathered in follow-up interviews, over photographs themselves. This paper presents an alternative methodological approach. Specifically, we approach photographs as primary sources, with a focus on their composition. First, we demonstrate how formal elements of photographs can be identified, and their meanings analysed. We show that domestic photographs speak to people’s relationships with their homes, and identify empirical insights into scale, light and absences. Second, we combine data from follow-up interviews with formal analysis of images to confirm these insights, and generate additional findings – e.g., regarding the negotiation of domestic architecture and the meanings of possessions. We conclude that photo-elicitation studies of homemaking benefit from both visual and narrative insights into participants’ homes, and that both types of data merit serious analysis.
Cross-spectrum of signals of vibrations and their application for determination of the technical condition of dynamic equipment
Creators: name: Mylnikov, Leonid
name: Efimov, Nikita
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2022
Subjects: subject: 004

description: The aim of the paper is to develop ranking techniques for dynamic equipment based on its technical conditions, the estimation of recovered resource value and the determination of critical points of time after which equipment operation has to be terminated. Accelerometer data, cross-spectrum for wave analysis and a TOPSIS-based method have been used to achieve the goal. The most significant result of the work is a method of estimating the technical condition of the equipment, which allows: 1) to perform the transition to condition-based equipment maintenance by predicting non-normative work time; 2) to plan preventive repairs; 3) to select performers for repairs and maintenance of equipment based on objective estimates of work quality. The importance of the results is as follows: 1) the application of multi-criteria ranking method allowed to make ranking according to the technical condition of the equipment units for which condition monitoring groups of sensors are used; 2) it is shown that equipment condition changing is non-linear and there are areas of accelerated degradation; when the latter ones are reached, an accelerated condition deterioration is encountered; 3) the application of the technique on the data simultaneously taken from four sensors has shown its ability to conduct a comprehensive estimation without reference to a specific type of failure in conditions when the data from individual accelerometers give different information about the failure due to the different distance from the problem area. The verification of the proposed theoretical results is carried out on the basis of operating time data before a bearing failure, as well as monitoring data on the operation of wind turbine gearboxes.
Fast Generation of Covariance Matrices for Weak Lensing
Creators: name: Sgier, Raphael
name: Réfrégier, Alexandre
name: Amara, Adam
name: Nicola, Andrina
Publisher: name: arXiv
Year: 2018
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Upcoming weak lensing surveys will probe large fractions of the sky with unprecedented accuracy. To infer cosmological constraints, a large ensemble of survey simulations are required to accurately model cosmological observables and their covariances. We develop a parallelized multi-lens-plane pipeline called UFalcon, designed to generate full-sky weak lensing maps from lightcones within a minimal runtime. It makes use of L-PICOLA, an approximate numerical code, which provides a fast and accurate alternative to cosmological $N$-Body simulations. The UFalcon maps are constructed by nesting 2 simulations covering a redshift-range from $z=0.1$ to $1.5$ without replicating the simulation volume. We compute the convergence and projected overdensity maps for L-PICOLA in the lightcone or snapshot mode. The generation of such a map, including the L-PICOLA simulation, takes about 3 hours walltime on 220 cores. We use the maps to calculate the spherical harmonic power spectra, which we compare to theoretical predictions and to UFalcon results generated using the full $N$-Body code GADGET-2. We then compute the covariance matrix of the full-sky spherical harmonic power spectra using 150 UFalcon maps based on L-PICOLA in lightcone mode. We consider the PDF, the higher-order moments and the variance of the smoothed field variance to quantify the accuracy of the covariance matrix, which we find to be a few percent for scales $\ell \sim 10^2$ to $10^3$. We test the impact of this level of accuracy on cosmological constraints using an optimistic survey configuration, and find that the final results are robust to this level of uncertainty. The speed and accuracy of our developed pipeline provides a basis to also include further important features such as masking, varying noise and will allow us to compute covariance matrices for models beyond $Λ$CDM. [abridged]
description: 20 pages, 7 figures
Dense Stellar Matter with Strange Quark Matter Driven by Kaon Condensation
Creators: name: Kim, Kyungmin
name: Lee, Hyun Kyu
name: Rho, Mannque
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The core of neutron-star matter is supposed to be at a much higher density than the normal nuclear matter density for which various possibilities have been suggested such as, for example, meson or hyperon condensation and/or deconfined quark or color-superconducting matter. In this work, we explore the implication on hadron physics of a dense compact object that has three "phases", nuclear matter at the outer layer, kaon condensed nuclear matter in the middle and strange quark matter at the core. Using a drastically simplified but not unreasonable model, we develop the scenario where the different phases are smoothly connected with the kaon condensed matter playing a role of "doorway" to a quark core, the equation of state (EoS) of which with parameters restricted within the range allowed by nature could be made compatible with the mass vs. radius constraint given by the 1.97-solar mass object PSR J1614-2230 recently observed.
description: 18 pages, 18 figures
title: 01_1322
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
WACSF - Weighted Atom-Centered Symmetry Functions as Descriptors in Machine Learning Potentials
Creators: name: Gastegger, Michael
name: Schwiedrzik, Ludwig
name: Bittermann, Marius
name: Berzsenyi, Florian
name: Marquetand, Philipp
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We introduce weighted atom-centered symmetry functions (wACSFs) as descriptors of a chemical system's geometry for use in the prediction of chemical properties such as enthalpies or potential energies via machine learning. The wACSFs are based on conventional atom-centered symmetry functions (ACSFs) but overcome the undesirable scaling of the latter with increasing number of different elements in a chemical system. The performance of these two descriptors is compared using them as inputs in high-dimensional neural network potentials (HDNNPs), employing the molecular structures and associated enthalpies of the 133855 molecules containing up to five different elements reported in the QM9 database as reference data. A substantially smaller number of wACSFs than ACSFs is needed to obtain a comparable spatial resolution of the molecular structures. At the same time, this smaller set of wACSFs leads to significantly better generalization performance in the machine learning potential than the large set of conventional ACSFs. Furthermore, we show that the intrinsic parameters of the descriptors can in principle be optimized with a genetic algorithm in a highly automated manner. For the wACSFs employed here, we find however that using a simple empirical parametrization scheme is sufficient in order to obtain HDNNPs with high accuracy.
Mathematical description of control problems in SDN networks
Creators: name: Romanov, Oleksandr
name: Siemens, Eduard
name: Nesterenko, Mikola
name: Mankivskyi, Volodymyr
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2021
Subjects: subject: 004

description: To improve the efficiency of networks, fully automate the processes of network management, administration and technological, reduce the time to market for modern services, ensure the introduction of new technologies throughout the network, and not gradually introduce them at individual sites, operators are starting the practical use of software-defined networks with virtualization network functions. The optimality of the decisions made, largely depends on the capabilities of the control plane in the SDN architecture. To obtain optimal solutions, a mathematical formulation of control problems is required, using real indicators of the functioning of telecommunication networks as input data. The paper proposes mathematical models of the process of functioning of the SDN network in the main modes of operation: in the mode of planned changes in the structure of the network, in the mode of normal functioning, when all performance indicators are within the specified values, in the overload mode. The results obtained make it possible to determine the list of required network elements, to distribute functions between the elements of the control system, to develop requirements for the monitoring system to collect the necessary initial data and to determine the interaction algorithm of the elements to obtain optimal solutions in the process of network management.
Multi-Criteria Optimisation for Building it Management Model within a Company
Creators: name: Globa, Larysa
name: Dovgyi, Stanislav
name: Kopiika, Oleh
name: Kozlov, Oleksii
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: 004

description: The paper proposes approaches to multi-criteria optimisation when building an IT management model within a company using modern service-oriented IT solutions. It is proposed to employ a methodology that helps companies achieve appropriate levels of efficiency from IT implementation by maintaining a balance between the realisation of benefits, optimisation of risks and use of resources. The methodology enables administering and managing IT, both in the field of its functional responsibility and business tasks addressed by the company, while considering the IT needs of internal and external stakeholders. At the same time, a specific objective shall be defined, clarified, and specified in line with the balanced scorecard (financial, customer, internal processes, learning and growth). In addition, the task of effective IT implementation related to developmental priorities is fulfilled. In this case, the decision-making problem is characterised by a multi-criteria pattern. Specifically, the article proposes implementing decision-making principles using algorithms or procedures addressing multi-criteria optimisation problems. Almost all known approaches to solving these problems involve their scalarization, where consideration of the benefits is one of the main issues that must be addressed to select the best solution. Under this principle, the methods for solving multi-criteria optimisation problems are classified according to characteristics of information: decision-making under certainty; decision-making when information on the benefit system is unavailable; decision-making with the gradual acquisition of information on the benefit system; decision-making under multi-connectivity, heterogeneity, and multi-criteria information about the benefit system.
Photometric Redshift Error Estimators
Creators: name: Oyaizu, Hiroaki
name: Lima, Marcos
name: Cunha, Carlos E.
name: Lin, Huan
name: Frieman, Joshua
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Photometric redshift (photo-z) estimates are playing an increasingly important role in extragalactic astronomy and cosmology. Crucial to many photo-z applications is the accurate quantification of photometric redshift errors and their distributions, including identification of likely catastrophic failures in photo-z estimates. We consider several methods of estimating photo-z errors and propose new training-set based error estimators based on spectroscopic training set data. Using data from the Sloan Digital Sky Survey and simulations of the Dark Energy Survey as examples, we show that this method provides a robust, relatively unbiased estimate of photo-z errors. We show that culling objects with large, accurately estimated photo-z errors from a sample can reduce the incidence of catastrophic photo-z failures.
description: 10 pages, 11 figures, submitted to ApJ