cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum refrigerators in finite-time cycle duration
Creators: name: Jiao, Guangqian
name: Zhu, Shoubao
name: He, Jizhou
name: Ma, Yongli
name: Wang, Jianhui
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We derive cooling rate and coefficient of performance as well as their variances for a quantum Otto engine proceeding in finite-time cycle period. This machine consists of two driven strokes, where the system isolated from the heat reservoir undergoes finite-time unitary transformation, and two isochoric steps, where the finite-time system-bath interaction durations take the system away from the equilibrium even at the respective ends of the two stages. We explicitly calculate the statistics of cooling rate and coefficient of performance for the machine operating with an analytically solvable two-level system. We clarify the role of finite-time durations of four processes on the machine performance. We show that there is the trade-off between the performance parameter and its corresponding variance, thereby indicating that the cooling rate or coefficient of performance can be enhanced, but at the cost of increasing the corresponding fluctuations.
On the relation between tensor and scalar perturbation modes in Friedmann cosmology
Creators: name: Lukash, V. N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: An elementary derivation of the fundamental relation $T/S=4γ$ between the tensor and scalar modes of cosmological perturbations in the early universe is given. Statements by L.P.Grishchuk on this problem are commented on.
description: An extended version of the paper published in Usp. Fiz. Nauk 176, 113 (2006) [Phys. Usp. V.49, P.103 (2006)]; 8 pages
Litonotus fasciola Ehrenberg 1870
Creators: name: Durán-Ramírez, Carlos Alberto
name: Dias, Roberto Júnio Pedroso
name: Estrada, Rosaura Mayén-
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Chromista
Ciliophora
Gymnostomatea
Pleurostomatida
Litonotidae
Litonotus
Litonotus fasciola

description: Litonotus fasciola Ehrenberg, 1870
Distribution. COLOMBIA: Lloró (Paz 1980), (Gs).
description: Published as part of Durán-Ramírez, Carlos Alberto, Dias, Roberto Júnio Pedroso & Estrada, Rosaura Mayén-, 2020, Checklist of ciliates (Alveolata: Ciliophora) that inhabit in bromeliads from the Neotropical Region, pp. 1-36 in Zootaxa 4895 (1) on page 17, DOI: 10.11646/zootaxa.4895.1.1, http://zenodo.org/record/4321437
Evidence for 3D-xy critical properties in underdoped YBa2Cu3O7+x
Creators: name: Schneider, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We perform a detailed analysis of the irreversible magnetization data of Salem-Sugui et al. and Babis et al. of underdoped and optimally doped YBa2Cu3O7+x single crystals. Near the zero field transition temperature we observe extended consistency with the properties of the 3D-xy universality class, even though the attained critical regime is limited by an inhomogeneity induced finite size effect. Nevertheless, as Tc falls from 93.5 to 41.5 K the critical amplitude of the in-plane correlation length gsiab0, the anisotropy amma=gsiab0/gsic0 and the critical amplitude of the in-plane penetration depth Lamdaab0 increase substantially, while the critical amplitude of the c-axis correlation length gsic0 does not change much. As a consequence, the correlation volume Vcorr increases and the ritical amplitude of the specific heat singularity A decreases dramatically, while the rise of gsiab0 reflects the behavior of the zero temperature counterpart. Conversely, although gsiab0 and lamdaab0 increase with reduced Tc, the Ginzburg-Landau parameter decreases substantially and YBa2Cu3O7+x crosses over from an extreme to a weak type-II superconductor.
description: 11 pages, 11 figures
High-quality Tailored-edge Cleaving Using Aberration-corrected Bessel-like Beams
Creators: name: Jenne, Michael
name: Flamm, Daniel
name: Ouaj, Taofiq
name: Hellstern, Julian
name: Kleiner, Jonas
name: Grossmann, Daniel
name: Koschig, Maximilian
name: Kaiser, Myriam
name: Kumkar, Malte
name: Nolte, Stefan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We report on the usage of ultrashort laser pulses in form of aberration-corrected Bessel-like beams for laser cutting of glass with bevels. Our approach foresees to incline the material's entrance surface with respect to the processing optics. The detailed analysis of phase distortions caused by the beam transition through the tilted glass surface allows to pre-compensate occurring aberrations using digital holography. We verify theoretical considerations by means of pump-probe microscopy and present high-quality edges in non-strengthened silicate glass.
description: Accepted Manuscript by Optics Letters, 4 pages, 5 figures and 3 visualizations, see DOI
Additional file 1 of Improvement of renal function after transcatheter aortic valve replacement and its impact on survival
Creators: name: Kylies, Dominik
name: Freitag-Wolf, Sandra
name: Fulisch, Florian
name: Seoudy, Hatim
name: Kuhn, Christian
name: Kihm, Lars Philipp
name: Pühler, Thomas
name: Lutter, Georg
name: Dempfle, Astrid
name: Frey, Norbert
name: Feldkamp, Thorsten
name: Frank, Derk
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Marine Biology
subject: Cancer

description: Additional file 1: Supplementary table 1. Variables included in the propensity score with their ORs from coefficients of multiple logistic regression model with outcome renal improvement. Fitted values of this logistic model were used to calculate the propensity score for each patient. Supplementary table 2. Multiple Cox model of two-year survival after TAVI. Supplementary table 3. Sensitivity analyses using different definitions of RI, based on improvement thresholds of serum creatinine or eGFR.
A physiological model to predict xenobiotic concentrations in fishes
Creators: name: Yang, Rong
Publisher: name: University of British Columbia
Year: 2009

description: A physiological model was developed to estimate fish body toxicant load based on information regarding the chemical exposure regime, fish body weight, lipid content and oxygen uptake. Three organic compounds of different hydrophobicity, 1,2,4,5- tetrachlorobenzene (TeCB), 3,4,5,6-tetrachloroguaiacol (TeCG) and 4,6-dichlorobenzenediol (DBD), were chosen as the test chemicals to carry out a series of investigations before an overall model was assembled. The primary focus of the model was to incorporate physiological components into traditional compartmental models in order to avoid the difficulties associated with complex conventional physiological models. The approach taken was to predict rate constants based on fish oxygen consumption, a parameter speculated, and subsequently shown, to be closely correlated to toxicant transfer in fish. A significant correlation was found between the toxicant uptake process, as characterized by the uptake rate constant (k1), and fish oxygen consumption, regardless of fish size and species. Moreover, the correlation was improved when fish toxicant body load was expressed on a percent body lipid basis. Similarly, fish toxicant depuration tests showed that there also existed a significant relationship between the toxicant depuration rate constant (k2) and fish oxygen uptake regardless of the differences in the chemical octanol/water partition coefficients (Kow ) . The finding that the chosen test compounds did not interfere with fish oxygen consumption after prolonged sublethal exposure justified the use of oxygen uptake as an indicator for fish toxicant transfer and, as equally important, the utilization of a large fish oxygen consumption database (OXYREF) in the proposed chemical modeling. A series of feeding experiments were also carried out and it was concluded that fish toxicant transfer across the gills plays a dominant role in the toxicant accumulation and depuration of non-metabolized chemicals in fish. Uptake of these toxicants in the food was negligible in determining body burden. In view of the above findings a general model was tested in which OXYREF was used to predict fish toxicant body burden. Based on the quantitative analysis, it was shown that the model was reliable and accurate in estimating fish body burden of a number of non-metabolized aquatic toxicants. Values calculated using this model agreed with most determinations reported in the literature. Despite the restrictions and preconditions associated with this physiological model, its main advantage over other compartmental or physiological models lies in the fact that the prediction is based on the actual physiological processes, and fish oxygen consumption rate is far easier and accurate to measure than other physiological parameters even in the absence of the OXYREF. This modified model possesses some functional reality which enables more realistic predictions, making it useful for aquatic environmental risk assessment.
ANALYSE DE L'INFLUENCE DE LA DIVERSITÉ SUR LA PERFORMANCE SOCIALE DES ENTREPRISES  MULTINATIONALES AU BÉNIN
Creators: name: ADISSA Jules
name: SIMEN Francis Serge
Publisher: name: Zenodo
Year: 2024

description: L'objectif de cet article est d'analyser l'influence de la diversité en termes de culture, d’ethnie et de religion sur la performance sociale des firmes multinationales au Bénin. Pour ce faire, une étude a été menée dans le contexte des multinationales du secteur bancaire et de l’assurance en adoptant une approche quantitative. Les données recueillies auprès de deux cent trois cadres de banques et de sociétés d'assurances ont été soumises à un traitement statistique dans le logiciel SPSS.21. Les résultats indiquent que la diversité, en termes de culture, de religion et d'ethnie, exerce une influence positive et significative sur la performance sociale des multinationales. Cela met en évidence un effet bénéfique de la diversité sur la performance sociale de ces entreprises. Ainsi, cette étude contribue à une meilleure compréhension de l'effet de la diversité en milieu de travail sur la performance sociale des firmes multinationales au Bénin.
Magnetic confinement of massless Dirac fermions in graphene
Creators: name: De Martino, A.
name: Dell'Anna, L.
name: Egger, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Due to Klein tunneling, electrostatic potentials are unable to confine Dirac electrons. We show that it is possible to confine massless Dirac fermions in a monolayer graphene sheet by inhomogeneous magnetic fields. This allows one to design mesoscopic structures in graphene by magnetic barriers, e.g. quantum dots or quantum point contacts.
description: 4 pages, 3 figures, version to appear in PRL
Internal absorption of gamma-rays in relativistic blobs of active galactic nuclei
Creators: name: Sitarek, Julian
name: Bednarek, Wlodek
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the production of gamma-rays in the inverse Compton (IC) scattering process by leptons accelerated inside relativistic blobs in jets of active galactic nuclei. Leptons are injected homogeneously inside the spherical blob and initiate IC $e^\pm$ pair cascade in the synchrotron radiation (produced by the same population of leptons, SSC model), provided that the optical depth for gamma-rays is larger than unity. It is shown that for likely parameters internal absorption of gamma-rays has to be important. We suggest that new type of blazars might be discovered by the future simultaneous X-ray and $γ$-ray observations, showing peak emissions in the hard X-rays, and in the GeV $γ$-rays. Moreover, the considered scenario might be also responsible for the orphan X-ray flares recently reported from BL Lac type active galaxies.
description: 4 pages, 3 figures, Proc of The Multi-Messenger Approach To High-Energy Gamma-Ray Sources
Black Holes without Event Horizons
Creators: name: Nielsen, Alex B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We discuss some of the drawbacks of using event horizons to define black holes. The reasons are both practical, physical and theoretical. We argue that locally defined trapping horizons can remedy many of these drawbacks. We examine of the question of whether black hole thermodynamics should be associated with event horizons or trapping horizons. To this end we discuss what role trapping horizons may play in black hole thermodynamics. In addition, we show how trapping horizons may give rise to Hawking radiation and discuss the issue of gravitational entropy.
description: Talk at APCTP Winter School, Daejeon, Korea, 2008. 7 pages, no figures
A systematic review of interventions targeting modifiable factors that impact dietary intake in athletes
Creators: name: Janiczak, Amy
name: Alcock, Rebekah
name: Forsyth, Adrienne
name: Trakman, Gina
Publisher: name: La Trobe
Year: 2024
Subjects: classificationCode: 3210
subject: Nutrition and dietetics
classificationCode: 3006
subject: Food sciences

description: Appropriate dietary intake has been found to positively impact athletes' performance, body composition, and recovery from exercise. Strategies to optimise dietary intake often involve targeting one or more of the many factors that are known to influence dietary intake. This review aims to investigate the types and effectiveness of interventions used to impact modifiable factors of dietary intake in athletes. MEDLINE, CINAHL, SPORTDiscus, and Web of Science were searched from inception to May 2022 for intervention studies that measured dietary intake with a quantitative tool and explored at least one factor thought to influence the dietary intake of adult athletes. Study quality was assessed using the ADA Quality Criteria Checklist: Primary Research. Twenty-four studies were included. The most common interventions focused on nutrition education (n=10), macronutrient adjustment (n=7), and physical activity (n=5). The three most common factors thought to influence dietary intake addressed were nutrition knowledge (n=12), hunger and appetite (n=8), and body composition (n=4). Significant changes in dietary intake were found in 16 studies, with nutrition education interventions returning significant results in the largest proportion of studies (n=8). Study quality within this review was mostly average (n=4 < 50%, n=19 50-80%, n=1 >80%). As studies included were published between 1992 and 2021, interventions and factors explored in older studies may require up-to-date research to investigate possible differences in results due to time-related confounders.
VBSCan Thessaloniki 2018 Workshop Summary
Creators: name: Bellan, Riccardo
name: Beyer, Jakob
name: Bittrich, Carsten
name: Boldrini, Giacomo
name: Brivio, Ilaria
name: Bruni, Lucrezia Stella
name: Buarque Franzosi, Diogo
name: Charlot, Claude
name: Ciulli, Vitaliano
name: Covarelli, Roberto
name: Giljanovic, Duje
name: Gonella, Giulia
name: Govoni, Pietro
name: Gras, Philippe
name: Grossi, Michele
name: Herrmann, Tim
name: Kalinowski, Jan
name: Karlberg, Alexander
name: Kallonen, Kimmo
name: Kasimi, Eirini
name: Kayis Topaksu, Aysel
name: Kersevan, Borut
name: Kirschenmann, Henning
name: Kobel, Michael
name: Kordas, Konstantinos
name: Leisos, Antonios
name: Lelas, Damir
name: Lenzi, Piergiulio
name: Li, Ang
name: Lohwasser, Kristin
name: Lorenzo-Martinez, Narei
name: Manjarres, Joany
name: Mapelli, Dario
name: Marantis, Alexandros
name: Marchegiani, Matteo
name: Mascellani, Anna
name: Maznas, Ioannis
name: Mildner, Hannes
name: Mozer, Matthias Ulrich
name: Neukum, Max
name: Novak, Jakob
name: Ortona, Giacomo
name: Ozdemir, Kadri
name: Pellen, Mathieu
name: Pelliccioli, Giovanni
name: Petridou, Chariclia
name: Plätzer, Simon
name: Quaggio, Christian
name: Rauch, Michael
name: Rebuzzi, Daniela
name: Reuter, Jürgen
name: Sampsonidou, Despoina
name: Schramm, Steven
name: Siodmok, Andrzej
name: Slawinska, Magdalena
name: Szleper, Michał
name: Tarabini, Alessandro
name: Thorburn, Connor Innes
name: Todt, Stefanie
name: Tzamarias, Spyridon E.
name: Tsirigotis, Apostolos
name: Valsecchi, Davide
name: Wuest, Lilly
name: Zaro, Marco
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019
Subjects: vector boson: scattering
network

description: This document reports the first year of activity of the VBSCan COST Action network, as summarised by the talks and discussions happened during the VBSCan Thessaloniki 2018 workshop. The VBSCan COST action is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders.
Dynamical Emergence of Scalaron in Higgs Inflation
Creators: name: Ema, Yohei
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019

description: We point out that a light scalaron dynamically emerges if scalar fields have a sizable non-minimal coupling to the Ricci scalar as in the Higgs inflation model. We support this claim in two ways. One is based on the renormalization group equation; the non-minimal coupling inevitably induces a Ricci scalar quadratic term due to the renormalization group running. The other is based on scattering amplitudes; a scalar four-point amplitude develops a pole after summing over a certain class of diagrams, which we identify as the scalaron. Our result implies that the Higgs inflation is actually a two-field inflationary model. Another implication is that the Higgs inflation does not suffer from the unitarity issue since the scalaron pushes up the cut-off scale to the Planck scale.
Correlations in the properties of static and rapidly rotating compact stars
Creators: name: Agrawal, B. K.
name: Kumar, Raj
name: Dhiman, S. K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Correlations in the properties of the static compact stars (CSs) and the ones rotating with the highest observed frequency of 1122Hz are studied using a large set of equations of state (EOSs). These EOSs span various approaches and their chemical composition vary from the nucleons to hyperons and quarks in $β$-equilibrium. It is found that the properties of static CS, like, the maximum gravitational mass $M_{\rm max}^{\rm stat}$ and radius $R_{1.4}^{\rm stat}$ corresponding to t he canonical mass and supramassive or non-supramassive nature of the CS rotating at 1122 Hz are strongly correlated. In particular, only those EOSs yield the CS rotating at 1122Hz to be non-supramassive for which $\left (\frac{M_{\rm max}^{\rm stat}}{M_\odot}\right )^{1/2} \left (\frac{10{\rm km}}{R_{1.4}^{\rm stat}})^{3/2} $ is greater than unity. Suitable parametric form which can be used to split the $M_{\rm max}^{\rm stat}$ $-$ $R_{1.4}^{\rm stat}$ plane into the regions of different supramassive nature of the CS rotating at 1122Hz is presented. Currently measured maximum gravitational mass 1.76$M_\odot$ of PSR J0437-4715 suggests that the CS rotating at 1122Hz can be non-supramassive provided $R_{1.4}^{\rm stat} \leqslant 12.4$ km.
description: 13 pages, 4 figures, Appearing in Phys. Rev. D
Space of chord diagrams on spherical curves
Creators: name: Ito, Noboru
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: In this paper, we give a definition of $\mathbb{Z}$-valued functions from the ambient isotopy classes of spherical/plane curves derived from chord diagrams, denoted by $\sum_i α_i x_i$. Then, we introduce certain elements of the free $\mathbb{Z}$-module generated by the chord diagrams with at most $l$ chords, called relators of Type (I) ((SII), (WII), (SIII), or (WIII), resp.), and introduce another function $\sum_i α_i \tilde{x}_i$ derived from $\sum_i α_i x_i$. The main result (Theorem~1) shows that if $\sum_i α_i \tilde{x}_i$ vanishes for the relators of Type (I) ((SII), (WII), (SIII), or (WIII), resp.), then $\sum_i α_i x_i$ is invariant under the Reidemeister move of type RI (strong RII, weak RII, strong RIII, or weak RIII, resp.) that is defined in [Ito-Takimura (2013), J. Knot Theory Ramifications].
description: 21 pages, 12 figures, 1 table. arXiv admin note: text overlap with arXiv:1908.06085
The Development of Finite Element and Neural Network Based Tools for Early-Stage Thermal-Mechanical Design of Semiconductor Packages
Creators: name: Smith, Michael Joseph
Publisher: name: Purdue University Graduate School
Year: 2024
Subjects: classificationCode: 460207
subject: Modelling and simulation
classificationCode: 401706
subject: Numerical modelling and mechanical characterisation
classificationCode: 401707
subject: Solid mechanics
classificationCode: 461104
subject: Neural networks

description: The adoption of Heterogeneous Integration (HI) technologies in semiconductor packaging to build 2.5D/3D structures has led to increased power densities and material heterogeneity. These structures place a new burden on thermal and mechanical design. Additionally, these structures allow for significantly increased physical design freedom. With more possible layout options as well as tougher thermal constraints, new specialized tools are required to accelerate this type of design.To address this problem using traditional finite element analysis Stack3D is presented. Stack3D is a steady-state thermal-mechanical geometry modeling and analysis platform for advanced packaging early design exploration. It is a finite element simulator developed from scratch in Matlab complete with symbolic geometry representation, automatic meshing, chip power map support, and sparse matrix acceleration.After the development of Stack3D, methods for further accelerating the simulation process at the cost of solution accuracy were examined. Neural networks were selected as an engine for this task based on their millisecond evaluation time. In order to choose between the training paradigms of Physics Informed and Data Driven neural networks, a series of benchmarks were run to identify Data Driven networks as ideal candidates for steady state heat conduction.Last, the first neural network model for fully generalized steady state heat conduction of 3D packages is developed. This is made possible by using the solution to the partial differential equation governing steady state heat conduction and casting the problem into an image-to-image translation framework. After accounting for the third spatial dimension, this allows the use of cutting edge image processing network for the heat conduction problem. After training, the network was able to run tens of thousands of simulations with an average of 0.53\% error and 0.0035 seconds per simulation.
Property of Tsallis entropy and principle of entropy increase
Creators: name: Du, Jiulin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The property of Tsallis entropy is examined when considering tow systems with different temperatures to be in contact with each other and to reach the thermal equilibrium. It is verified that the total Tsallis entropy of the two systems cannot decrease after the contact of the systems. We derived an inequality for the change of Tsallis entropy in such an example, which leads to a generalization of the principle of entropy increase in the framework of nonextensive statistical mechanics.
description: 8 pages,11 references; The 2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science, Nov.27-Dec.1, 2006, Bangalore, India
Rough translation of file 026_A (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-281214-01: Rough translation (in approximately 30 second segments) of file 026_A (tape 026, side A) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 29:57 to the end of the file; no transcription in this session, translation only. Segments were recorded separately then joined into one file after the session. Recorded directly on a MacBook Pro laptop computer, affecting audio quality. Due to re-numbering, tape 026_A has been assigned to the CLA item number LA256.026, audio file LA256.026A.
Charmonium dissociation by mesons in heavy-ion collisions
Creators: name: Lykasov, Gennady I.
name: Cassing, Wolfgang
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The charmonium dissociation by mesons in relativistic heavy-ion reactions is analyzed within the Regge approach. It is shown that the inclusion of the initial and final state interactions in the dissociation of J/Psi to bar{D}* D* close to threshold increases the cross section significantly and can not be neglected in comparison to the total dissociation rate. This is due to resonant bar{D}*-D* interactions in sqrt{s} close to the masses of the Psi(4.04) and Psi(4.16) mesons. We also investigate thermal effects of the (c bar{c}) width for such processes in the medium. All these effects change both the magnitude and the shape of the cross section as a function of sqrt{s}. The results obtained should be applied in the analysis of open and hidden charm production in heavy-ion collisions.
description: 4 pages, 2 figures; Talk given at ICTP 5th International Conference on Perspectives in Hadronic Physics, Trieste, Italy, 22-26 May 2006
Estimating fast transient detection pipeline efficiencies at UTMOST via real-time injection of mock FRBs
Creators: name: Gupta, Vivek
name: Flynn, Chris
name: Farah, Wael
name: Jameson, Andrew
name: Krishnan, Vivek Venkatraman
name: Bailes, Matthew
name: Bateman, Timothy
name: Deller, Adam T.
name: Mandlik, Ayushi
name: Sutherland, Angus
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Dedicated surveys using different detection pipelines are being carried out at multiple observatories to find more Fast Radio Bursts (FRBs). Understanding the efficiency of detection algorithms and the survey completeness function is important to enable unbiased estimation of the underlying FRB population properties. One method to achieve end-to-end testing of the system is by injecting mock FRBs in the live data-stream and searching for them blindly. Mock FRB injection is particularly effective for machine-learning-based classifiers, for which analytic characterisation is impractical. We describe a first-of-its-kind implementation of a real-time mock FRB injection system at the upgraded Molonglo Observatory Synthesis Telescope (UTMOST) and present our results for a set of 20,000 mock FRB injections. The injections have yielded clear insight into the detection efficiencies and have provided a survey completeness function for pulse width, fluence and DM. Mock FRBs are recovered with uniform efficiency over the full range of injected DMs, however the recovery fraction is found to be a strong function of the width and Signal-to-Noise (SNR). For low widths ($\lesssim 20$ ms) and high SNR ($\gtrsim$ 9) the recovery is highly effective with recovery fractions exceeding 90%. We find that the presence of radio frequency interference causes the recovered SNR values to be systematically lower by up to 20% compared to the injected values. We find that wider FRBs become increasingly hard to recover for the machine-learning-based classifier employed at UTMOST. We encourage other observatories to implement live injection set-ups for similar testing of their surveys.
description: 12 pages, 9 figures. Accepted for publication in MNRAS
Barrow black hole corrected-entropy model and Tsallis nonextensivity
Creators: name: Abreu, Everton M. C.
name: Neto, Jorge Ananias
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The quantum scenario concerning Hawking radiation, gives us a precious clue that a black hole has its temperature directly connected to its area gravity and that its entropy is proportional to the horizon area. These results have shown that there exist a deep association between thermodynamics and gravity. The recently introduced Barrow formulation of back holes entropy, influenced by the spacetime geometry, shows the quantum fluctuations effects through Barrow exponent, $Δ$, where $Δ=0$ represents the usual spacetime and its maximum value, $Δ=1$, characterizes a fractal spacetime. The quantum fluctuations are responsible for such fractality. Loop quantum gravity approach provided the logarithmic corrections to the entropy. This correction arises from quantum and thermal equilibrium fluctuations. In this paper we have analyzed the nonextensive thermodynamical effects of the quantum fluctuations upon the geometry of a Barrow black hole. We discussed the Tsallis' formulation of this logarithmically corrected Barrow entropy to construct the equipartition law. Besides, we obtained a master equation that provides the equipartition law for any value of the Tsallis $q$-parameter and we analyzed several different scenarios. After that, the heat capacity were calculated and the thermal stability analysis was carried out as a function of the main parameters, namely, one of the so-called pre-factors, $q$ and $Δ$.
description: 10 pages. To be published in PLB
A distributed control problem for a fractional tumor growth model
Creators: name: Colli, Pierluigi
name: Gilardi, Gianni
name: Sprekels, Jürgen
Publisher: name: Weierstrass Institute
Year: 2019
Subjects: subject: Fractional operators
subject: Cahn--Hilliard systems
subject: well-posedness
subject: regularity
subject: optimal control
subject: necessary optimality conditions
subject: 35K55
subject: 35Q92
subject: 49J20
subject: 92C50

description: In this paper, we study the distributed optimal control of a system of three evolutionary equations involving fractional powers of three selfadjoint, monotone, unbounded linear operators having compact resolvents. The system is a generalization of a Cahn--Hilliard type phase field system modeling tumor growth that goes back to Hawkins-Daarud et al. (Int. J. Numer. Math. Biomed. Eng. 28 (2012), 3--24.) The aim of the control process, which could be realized by either administering a drug or monitoring the nutrition, is to keep the tumor cell fraction under control while avoiding possible harm for the patient. In contrast to previous studies, in which the occurring unbounded operators governing the diffusional regimes were all given by the Laplacian with zero Neumann boundary conditions, the operators may in our case be different; more generally, we consider systems with fractional powers of the type that were studied in the recent work Adv. Math. Sci. Appl. 28 (2019), 343--375  by the present authors. In our analysis, we show the Fréchet differentiability of the associated control-to-state operator, establish the existence of solutions to the associated adjoint system, and derive the first-order necessary conditions of optimality for a cost functional of tracking type.
Gamma-Ray Bursts in $1.8 < z < 5.6$ Suggest that the Time Variation of the Dark Energy is Small
Creators: name: Kodama, Yoshiki
name: Yonetoku, Daisuke
name: Murakami, Toshio
name: Tanabe, Sachiko
name: Tsutsui, Ryo
name: Nakamura, Takashi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calibrated the peak energy-peak luminosity relation of GRBs (so called Yonetoku relation) using 33 events with the redshift $z < 1.62$ without assuming any cosmological models. The luminosity distances to GRBs are estimated from those of large amount of Type Ia supernovae with $z<1.755$. This calibrated Yonetoku relation can be used as a new cosmic distance ladder toward higher redshifts. We determined the luminosity distances of 30 GRBs in $1.8 < z < 5.6$ using the calibrated relation and plotted the likelihood contour in $(Ω_m,Ω_Λ)$ plane. We obtained $(Ω_m, Ω_Λ)= (0.37^{+0.14}_{-0.11}, 0.63^{+0.11}_{-0.14})$ for a flat universe. Since our method is free from the circularity problem, we can say that our universe in $1.8 < z < 5.6$ is compatible with the so called concordance cosmological model derived for $z < 1.8$. This suggests that the time variation of the dark energy is small or zero up to $z\sim 6$.
description: 4 pages, 4 figures, accepted to MNRAS
Supersymmetric gyratons in five dimensions
Creators: name: Caldarelli, Marco M.
name: Klemm, Dietmar
name: Zorzan, Emanuele
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We obtain the gravitational and electromagnetic field of a spinning radiation beam-pulse (a gyraton) in minimal five-dimensional gauged supergravity and show under which conditions the solution preserves part of the supersymmetry. The configurations represent generalizations of Lobatchevski waves on AdS with nonzero angular momentum, and possess a Siklos-Virasoro reparametrization invariance. We compute the holographic stress-energy tensor of the solutions and show that it transforms without anomaly under these reparametrizations. Furthermore, we present supersymmetric gyratons both in gauged and ungauged five-dimensional supergravity coupled to an arbitrary number of vector supermultiplets, which include gyratons on domain walls.
description: 25 pages, no figures, uses JHEP3.cls. Final version to appear in CQG
Research Data Management: Policy, Implementation, Monitoring
Creators: name: Guzman-Ramirez, Lizette
Publisher: name: Zenodo
Year: 2024
Subjects: Research Data Management
Open Science
Policy

description: In this presentation we will dive into the Dutch context of research data management and open science. We will use the university of technology of Eindhoven as a use case in how to draft a policy, with the most important parts, how to plan the implementation of such policy, and finally how to monitor its uptake.

 I hope to give you practical tips and experiences that can be applied to other universities.
Camera motion estimation through planar deformation determination
Creators: name: Jonchery, Claire
name: Dibos, Françoise
name: Koepfler, Georges
Publisher: name: arXiv
Year: 2006
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In this paper, we propose a global method for estimating the motion of a camera which films a static scene. Our approach is direct, fast and robust, and deals with adjacent frames of a sequence. It is based on a quadratic approximation of the deformation between two images, in the case of a scene with constant depth in the camera coordinate system. This condition is very restrictive but we show that provided translation and depth inverse variations are small enough, the error on optical flow involved by the approximation of depths by a constant is small. In this context, we propose a new model of camera motion, that allows to separate the image deformation in a similarity and a ``purely'' projective application, due to change of optical axis direction. This model leads to a quadratic approximation of image deformation that we estimate with an M-estimator; we can immediatly deduce camera motion parameters.
description: 21 pages, version modifi\'ee accept\'e le 20 mars 2008
Letter from J. L. Logie to "Sir" [E. C. Maile], April 20, 1926
Creators: name: Logie, J. L.
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to "Sir" [E. C. Maile] from J. L. Logie, dated April 20, 1926, regarding the history of the proposition and the land and irrigation system in question.
Effective Potential of Higgs Field in Warped Gauge-Higgs Unification
Creators: name: Haba, Naoyuki
name: Matsumoto, Shigeki
name: Okada, Nobuchika
name: Yamashita, Toshifumi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The gauge-Higgs unification is one of influential scenarios to solve the hierarchy problem in the Standard Model. Recently, the scenario on the warped background attracts many attentions due to a large possibility to construct a realistic model naturally in this framework. It is, however, well known that the effective potential for the Higgs field, which is the most important prediction of the scenario, is not easy to calculate on the warped background, because masses of Kaluza-Klein particles are not obtained analytically. In this article, we derive useful formulae for the effective potential. The formulae allow us to calculate the Higgs mass easily, thus to construct a realistic model in the gauge-Higgs unification scenario on the warped background. Using obtained formulae, we calculate contributions from bulk fermions with several boundary conditions. We also show bulk fermions, which have boundary conditions not allowed in the orbifold picture, do not contribute to the effective potential.
description: 28 pages, 6 figures
Dynamics of Sunspot Shock Waves in the Chromosphere and Transition Region
Creators: name: Kayshap, Pradeep
name: Tripathi, Durgesh
name: Jelinek, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study the dynamics of shock waves observed in the umbra of a sunspot using the spectroscopic observations from the Interface Region Imaging Spectrometer (IRIS). The presence of the shock significantly deforms the shape of the spectral lines of Mg II , C II , and Si IV . We found that C II 1335.66 Å and Si IV 1393.75 Å show double-peaked profiles that change to a single peak later on. However, the Mg II h 2803.53 Å line first shows flat-top profiles that change into double-peaked followed by the single peak. To study the shock dynamics, we isolate the shock component from the spectra by fitting two Gaussians. We find that the lifetime of the shock is largest in Mg II h 2803.53 Å line. Moreover, the plasma motion shows both acceleration and deceleration phase of the shock. Yet, in C II 1335.66 Å and Si IV 1393.75 Å, only deceleration phase is observed. We observe a strong correlation between the largest blueshift of the shock and deceleration for all three spectral lines. We find a positive (negative) correlation between intensities contributed due to the shocks in Mg II and C II (Si IV ). This is suggestive that the shocks are first amplified in C II , followed by a decline in the height range corresponding to Si IV . These results may indicate the dissipation of shocks above the formation height of C II , and the shocks may have important roles in the dynamics of the upper chromosphere and transition region above sunspots.
description: 20 Pages, 9 Figure, Accepted for Publication in ApJ
A VISÃO E CONCLUSÕES DE PAULO FREIRE SOBRE AS CONCEPÇÕES TEÓRICAS DA APRENDIZAGEM
Creators: name: Jocirley de OLIVEIRA
name: Thatiany Milhomem Timóteo de OLIVEIRA
Publisher: name: Zenodo
Year: 2024
Subjects: Paulo Freie
Concepções
Teoria
Aprendizagem

description: RESUMO

Paulo Freire, um dos mais importantes educadores brasileiros, tinha uma visão crítica e transformadora sobre a educação e a aprendizagem. Para ele, a educação não deveria ser apenas um processo de transmissão de conhecimentos, mas sim um ato político, que promove a emancipação e a libertação das pessoas.   Em suas obras, Freire discute diversas teorias da aprendizagem, como o behaviorismo, o cognitivismo e o construtivismo, e critica a ideia de que a aprendizagem seja um processo neutro e objetivo, que ocorre apenas na mente do indivíduo. Para ele, a aprendizagem é um processo social e cultural, que ocorre em interação com o mundo e com os outros indivíduos. Nesse sentido, o objetivo deste artigo é apresentar a visão e conclusões de Paulo Freire sobre as concepções teóricas da aprendizagem. Assim, Freire propõe uma abordagem pedagógica crítica e dialógica, que valorize a experiência e a participação dos alunos na construção do conhecimento. Essa abordagem é baseada na ideia de que a aprendizagem é um processo ativo, em que os alunos devem ser sujeitos de sua própria educação, e não apenas objetos passivos do ensino. As concepções e teorias da aprendizagem propostas por Paulo Freire têm sido amplamente estudadas e aplicadas em diversos contextos educacionais, como a educação popular, a educação de jovens e adultos, a educação infantil e a formação de professores. A pesquisa foi de cunho bibliográfico e a abordagem qualitativa. Os resultados da pesquisa nos levam a compreensão de que suas ideias têm inspirado educadores e pesquisadores em todo o mundo a repensar a educação e a buscar uma prática pedagógica mais crítica e transformadora.
Litonotus varsaviensis Wrzesniowski 1870
Creators: name: Durán-Ramírez, Carlos Alberto
name: Dias, Roberto Júnio Pedroso
name: Estrada, Rosaura Mayén-
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Chromista
Ciliophora
Gymnostomatea
Pleurostomatida
Litonotidae
Litonotus
Litonotus varsaviensis

description: Litonotus varsaviensis (Wrześniowski, 1866) Wrześniowski, 1870
Distribution. BRAZIL: Paraná River between the Nupelia’s Field Station and the district of Porto São José, São Pedro do Paraná (Buosi et al. 2014 b, 2015), (Ad).
description: Published as part of Durán-Ramírez, Carlos Alberto, Dias, Roberto Júnio Pedroso & Estrada, Rosaura Mayén-, 2020, Checklist of ciliates (Alveolata: Ciliophora) that inhabit in bromeliads from the Neotropical Region, pp. 1-36 in Zootaxa 4895 (1) on page 17, DOI: 10.11646/zootaxa.4895.1.1, http://zenodo.org/record/4321437
Collective Resonances in the Soliton Model Approach to Meson--Baryon Scattering
Creators: name: Weigel, H
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The proper description of hadronic decays of baryon resonances has been a long standing problem in soliton models for baryons. In this talk I present a solution to this problem in the three flavor Skyrme model that is consistent with large-Nc consistency conditions. As an application I discuss hadronic pentaquark decays and show that predictions based on axial current matrix elements are erroneous.
description: Contribution to QNP06 (Madrid, June 2006), 3 pages epja style
Tunable plasma wave resonant detection of optical beating in high electron mobility transistor
Creators: name: Torres, Jérémi
name: Nouvel, P.
name: Akwoue-Ondo, A.
name: Chusseau, L.
name: Teppe, F.
name: Shchepetov, A.
name: Bollaert, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report on tunable terahertz resonant detection of two 1.55 µm cw-lasers beating by plasma waves in AlGaAs/InGaAs/InP high-electron-mobility transistor. We show that the fundamental plasma resonant frequency and its odd harmonics can be tuned with the applied gate-voltage in the range 75-490 GHz. The observed frequency dependence on gate-bias is found to be in good agreement with the theoretical plasma waves dispersion law.
description: Applied Physics Letters to be published (2006) --
Simulation of the orbit and spin period evolution of the double pulsars PSR J0737-3039 from their birth to coalescence induced by the gravitational wave radiation
Creators: name: Liu, Peng
name: Yang, Yi-Yan
name: Zhang, Jian-Wei
name: Rah, Maria
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The complete orbital and sin period evolutions of the double neutron star (NS) system PSR J0737-3039 are simulated from the birth to coalescence, which include the two observed radio pulsars classified as primary NS PSR J0737-3039A and companion NS PSR J0737-3039B. By employing the characteristic age of PSR J0737-3039B to constrain the true age of the double pulsar system, the initial orbital period and initial binary separation are obtained as 2.89 hrs and $1.44 \times 10^{6}$ km, respectively, and the coalescence age or the lifetime from the birth to merger of PSR J0737-3039 is obtained to be $1.38 \times 10^{8}$ yr. At the last minute of coalescence, corresponding to that the gravitational wave frequency changes from 20 Hz to 1180 Hz, we present the binary separation of PSR J0737-3039 to be from 442 km to 30 km, while the spin periods of PSR J0737-3039A and PSR J0737-3039B are 27.10 ms and 4.63 s, respectively. From the standard radio pulsar emission model, before the system merged, the primary NS could still be observed by the radio telescope, while the companion NS has crossed the death line in the pulsar magnetic-field versus period ($B-P$) diagram which is usually considered to cease the life as a pulsar. It is for the first time that the whole life evolutionary simulation of the orbit and spin periods for double NS system is presented, which provides the useful information for observing the primary NS at the coalescence stage.
Controlled Single-Photon Emission from a Single Trapped Two-Level Atom
Creators: name: Darquié, Benoit
name: Jones, Matthew
name: Dingjan, Jos
name: Beugnon, Jerome
name: Bergamini, Silvia
name: Sortais, Yvan
name: Messin, Gaetan
name: Browaeys, Antoine
name: Grangier, Philippe
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: By illuminating an individual rubidium atom stored in a tight optical tweezer with short resonant light pulses, we create an efficient triggered source of single photons with a well-defined polarization. The measured intensity correlation of the emitted light pulses exhibits almost perfect antibunching. Such a source of high rate, fully controlled single photon pulses has many potential applications for quantum information processing.
Landscape Agroforestry Modeling for a Sufficiency Economy in Huai Raeng-Klong Peed Watershed, Trat Province, Thailand
Creators: name: S. Chaipong
name: C. Wachrinrat
Publisher: name: Environmental Research Institute Chulalongkorn University Press
Year: 2015
Subjects: Agroforestry, landscape agroforestry, sufficiency economy, modeling

description: 3, 37, Applied Environmental Research
Determination of polycyclic aromatic hydrocarbons (PAHs) on selected dumpsites in Abeokuta Metropolis, SW, Nigeria
Creators: name: Olufunmilayo O. Olayinka
name: Oludare H. Adedeji
name: Rotimi A. Ipeaiyeda
Publisher: name: Environmental Research Institute Chulalongkorn University Press
Year: 2015
Subjects: Solid waste, open dumpsite, polycyclic aromatic hydrocarbons, contamination, health risk, toxicity

description: 3, 37, Applied Environmental Research