cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The FUor star V2493 Cyg (HBC 722) -- eleven years at maximum brightness
Creators: name: Semkov, Evgeni
name: Ibryamov, Sunay
name: Peneva, Stoyanka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: At the time of stellar evolution, young stellar objects go through processes of increased activity and instability. Star formation takes place in several stages during which the star accumulates enough mass to initiate thermonuclear reactions in the nucleus. A significant percentage of the mass of Sun-like stars accumulates during periods of increased accretion known as FUor outbursts. Since we know only about two dozen stars of this type, the study of each new object is very important for our knowledge. In this paper, we present data from photometric monitoring on a FUor object V2493 Cyg discovered in 2010. Our data were obtained in the optical region with BVRI Johnson-Cousins set of filters during the period from November 2016 to February 2021. The results of our observations show that during this period no significant changes in the brightness of the star were registered. We only detect variations with a small amplitude around the maximum brightness value. Thus, since 2013 V2493 Cyg remains at its maximum brightness, without a decrease in brightness. Such photometric behavior is not typical of other stars from FUor type. Usually the light curves of FUors are asymmetrical, with a very rapid rise and gradual decline of the brightness. V2493 Cyg remains unique in this respect with a very rapid rise in brightness and prolonged retention in maximum light. Our period analysis made for the interval February 2013 - February 2021 reveals a well-defined period of 914+/-10 days. Such periodicity can be explained by dust structures remaining from star formation in orbit around the star.
description: 12 pages, 5 figures, Published in Symmetry, 2021, 13(12), 2433
The effect of neonatal testosterone propionate (TP) injections in male rats on active and passive avoidance tasks during the prepubescent and adult periods of life
Creators: name: Deol, Gurcharn Singh
Publisher: name: University of British Columbia
Year: 2010

description: The effect of neonatal testosterone propionate (TP) (100 ug/day for the first 5 days of life or 1.25 mg. on day 1 of birth) injections on the acquisition of both active and passive avoidance was studied. Testing was initiated during both the prepubescent and adult periods of life. Neonatal TP injections facilitated the acquisition of active avoidance responding prior to puberty and also in adulthood. Neonatal TP injections had no effect on passive avoidance responding. A number of physiological (body, gonadal and adrenal weights) and behavioural (activity, shock sensitivity) measures were also studied to investigate their possible role in influencing our results. The TP injections led to significantly lower gonadal weights in the TP-injected group. Prior to puberty the TP-injected animals also possessed heavier adrenal glands, and were more active than the control group. The TP-injected group also had lower shock thresholds than the control group. The results suggest that excess neonatal TP injections affect an organism's ability to acquire an active avoidance response. The exact mechanism by which TP injections have their effect is unknown at this time. Future research would help to clarify whether the effect of excess neonatal TP is directly on the associative process or indirectly through a number of other factors, investigated in this article. Paradoxically, increased activity would be expected to interfere with the acquisition of passive avoidance behaviour, but this did not prove to be the case as TP injected animals acquired this response just as well or slightly better than controls. The observed differences between groups on shock reactivity measures suggest another plausible explanation of the results. Neonatal TP injections could facilitate acquisition of an active avoidance response by increasing sensitivity to the motivational stimulus. This possibility becomes even more tenable when we consider that other investigators have found a positive correlation between shock sensitivity and learning an active avoidance response (Beatty et. al. 1970, Pare, 1969). Specifically, these investigators have found that females acquire an active avoidance response faster than males and also have lower reactivity thresholds to footshock than males. Our finding of lowered shock sensitivity following neonatal TP injections would appear to parallel these observations and suggests shock sensitivity may be making an important contribution to the active avoidance data.
Écouter la musique
Creators: name: Teruggi, Daniel
Publisher: name: Musica/Tecnologia
Year: 2010

description: Daniel Teruggi, after an analysis of the modalities of listening in relation to the multiple factors that determine it – including the different categorizations attributable to human perception of sound phenomenon, the reference context, the properties of the sound source – takes into account the changes made in the reception of the musical phenomenon by an acousmatic listening where, starting from a concept that is independent from the visual perception of the source, we define a framework in which our auditory imagination constructs images and sound forms from what music suggests.
description: Musica/Tecnologia, IV (2010)
Parameter estimation for computationally intensive nonlinear regression with an application to climate modeling
Creators: name: Drignei, Dorin
name: Forest, Chris E.
name: Nychka, Doug
Publisher: name: arXiv
Year: 2009
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Nonlinear regression is a useful statistical tool, relating observed data and a nonlinear function of unknown parameters. When the parameter-dependent nonlinear function is computationally intensive, a straightforward regression analysis by maximum likelihood is not feasible. The method presented in this paper proposes to construct a faster running surrogate for such a computationally intensive nonlinear function, and to use it in a related nonlinear statistical model that accounts for the uncertainty associated with this surrogate. A pivotal quantity in the Earth's climate system is the climate sensitivity: the change in global temperature due to doubling of atmospheric $\mathrm{CO}_2$ concentrations. This, along with other climate parameters, are estimated by applying the statistical method developed in this paper, where the computationally intensive nonlinear function is the MIT 2D climate model.
description: Published in at http://dx.doi.org/10.1214/08-AOAS210 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Souvenirs d’un auditeur pour un avenir des musiques électroacoustiques?
Creators: name: Decroupet, Pascal
Publisher: name: Musica/Tecnologia
Year: 2011

description: The Belgian musicologist examines some aspects of the use of technology in the field of contemporary music production, from the fruition point of view. He consid- ers the revolution that their impact caused by creating a hierarchy of the ‘acoustic dimension’ that differs profoundly from that inherited from history. By comparing the ‘acoustic’ sounds with the ‘electroacoustic’ ones, the author assesses the differ- ent implications of the ‘musical sense’ of the latter, in relation to their use and their production, stressing the need for a contextualization of their expressive values inside musical composing.
description: Musica/Tecnologia, V (2011)
Kohn anomaly and interplay of electron-electron and electron-phonon interactions in epitaxial graphene
Creators: name: Zhou, S. Y.
name: Siegel, D. A.
name: Fedorov, A. V.
name: Lanzara, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The interplay of electron-phonon (el-ph) and electron-electron (el-el) interactions in epitaxial graphene is studied by directly probing its electronic structure. We found a strong coupling of electrons to the soft part of the A1g phonon evident by a kink at 150+/-15 meV, while the coupling of electrons to another expected phonon E2g at 195 meV can only be barely detected. The possible role of the el-el interaction to account for the enhanced coupling of electrons to the A1g phonon, and the contribution of el-ph interaction to the linear imaginary part of the self energy at high binding energy are also discussed. Our results reveal the dominant role of the A1g phonon in the el-ph interaction in graphene, and highlight the important interplay of el-el and el-ph interactions in the self energy of graphene.
description: accepted to Phys. Rev. B
Host galaxy morphologies of X-ray selected AGN: assessing the significance of different black hole fueling mechanisms to the accretion density of the Universe at z~1
Creators: name: Georgakakis, A.
name: Coil, A. L.
name: Laird, E. S.
name: Griffith, R. L.
name: Nandra, K.
name: Lotz, J. M.
name: Pierce, C. M.
name: Cooper, M. C.
name: Newman, J. A.
name: Koekemoer, A. M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We use morphological information of X-ray selected AGN hosts to set limits on the fraction of the accretion density of the Universe at z~1 that is not likely to be associated with major mergers. Deep X-ray observations are combined with high resolution optical data from the Hubble Space Telescope in the AEGIS, GOODS North and GOODS South fields to explore the morphological breakdown of X-ray sources in the redshift interval 0.51e44 erg/s) compared to predictions for the stochastic fueling of massive black holes in disk galaxies.
description: Accepted for publication in MNRAS
Stochastic 0-dimensional Biogeochemical Flux Model: Effect of temperature fluctuations on the dynamics of the biogeochemical properties in a marine ecosystem
Creators: name: Lazzari, Paolo
name: Grimaudo, Roberto
name: Solidoro, Cosimo
name: Valenti, Davide
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a new stochastic model, based on a 0-dimensional version of the well known biogeochemical flux model (BFM), which allows to take into account the temperature random fluctuations present in natural systems and therefore to describe more realistically the dynamics of real marine ecosystems. The study presents a detailed analysis of the effects of randomly varying temperature on the lower trophic levels of the food web and ocean biogeochemical processes. More in detail, the temperature is described as a stochastic process driven by an additive self-correlated Gaussian noise. Varying both correlation time and intensity of the noise source, the predominance of different plankton populations is observed, with regimes shifted towards the coexistence or the exclusion of some populations. Finally a Fourier analysis carried out on the time series of the plankton populations shows how the ecosystem responds to the seasonal driving for different values of the noise intensity.
Quasiplurisubharmonic Green functions
Creators: name: Coman, Dan
name: Guedj, Vincent
Publisher: name: arXiv
Year: 2009
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 32U35; 32W20; 32Q15

description: Given a compact Kähler manifold $X$, a quasiplurisubharmonic function is called a Green function with pole at $p\in X$ if its Monge-Ampère measure is supported at $p$. We study in this paper the existence and properties of such functions, in connection to their singularity at $p$. A full characterization is obtained in concrete cases, such as (multi)projective spaces.
description: 23 pages; to appear in Journal de Mathematiques Pures et Appliquees
Baryon Binding Energy in Sakai-Sugimoto Model
Creators: name: Sadeghi, J.
name: Pahlavani, M. R.
name: Heshmatian, S.
name: Morad, R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The binding energy of baryon has been studied in the dual $AdS_5\times S^5$ string theory with a black hole interior. In this picture baryon is constructed of a $D_5$ brane vertex wrapping on $S^5$ and $N_c$ fundamental strings connected to it. Here, we calculate the baryon binding energy in Sakai-Sugimoto model with a $D_4/D_8/\bar{D_8}$ in which the supersymmetry is completely broken. Also we check the $T$ dependence of the baryon binding energy. We believe that this model represents an accurate description of baryons due to the existence of Chern-Simones coupling with the gauge field on the brane. We obtain an analytical expression for the baryon binding energy . In that case we plot the baryon binding energy in terms of radial coordinate. Then by using the binding energy diagram, we determine the stability range for baryon configuration. And also the position and energy of the stable equilibrium point is obtained by the corresponding diagram. Also we plot the baryon binding energy in terms of temperature and estimate a critical temperature in which the baryon would be dissociated.
description: 14 pages, 1 fig
Theory of electromagnon in the multiferroic Mn perovskites: Vital role of higher harmonic components of the spiral spin order
Creators: name: Mochizuki, Masahito
name: Furukawa, Nobuo
name: Nagaosa, Naoto
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study theoretically the electromagnon and its optical spectrum (OS) of the terahertz-frequency regime in the magnetic-spiral-induced multiferroic phases of the rare-earth (R) Mn perovskites, RMnO3, taking into account the elliptical deformation or the higher harmonics of the spiral spin configuration, which has been missed so far. A realistic spin Hamiltonian, which gives phase diagrams in agreement with experiments, resolves a long standing puzzle, i.e., the double-peak structure of the OS with a larger low-energy peak originating from magnon modes hybridized with the zone-edge state. We also predict the magnon branches associated with the electromagnon, which can be tested by neutron-scattering experiment.
description: 5 pages, 4 figures
Non-compact Mirror Bundles and (0,2) Liouville Theories
Creators: name: Nakayama, Yu
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study (0,2) deformations of N=2 Liouville field theory and its mirror duality. A gauged linear sigma model construction of the ultraviolet theory connects (0,2) deformations of Liouville field theory and (0,2) deformations of N=2 SL(2,R)/U(1) coset model as a mirror duality. Our duality proposal from the gauged linear sigma model completely agrees with the exact CFT analysis. In the context of heterotic string compactifications, the deformation corresponds to the introduction of a non-trivial gauge bundle. This non-compact Landau-Ginzburg construction yields a novel way to study the gauge bundle moduli for non-compact Calabi-Yau manifolds.
description: 34 pages
CNO abundances of HdC and RCB stars: a view of the nucleosynthesis in a white dwarf merger
Creators: name: Garcia-Hernandez, D. A.
name: Hinkle, K. H.
name: Lambert, David. L.
name: Eriksson, K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present high-resolution (R~50,000) observations of near-IR transitions of CO and CN of the five known hydrogen-deficient carbon (HdC) stars and four R Coronae Borealis (RCB) stars. We perform an abundance analysis of these stars by using spectrum synthesis and state-of-the-art MARCS model atmospheres for cool hydrogen-deficient stars. Our analysis confirms reports by Clayton and colleagues that those HdC stars exhibiting CO lines in their spectrum and the cool RCB star S Aps are strongly enriched in 18O (with 16O/18O ratios ranging from 0.3 to 16). Nitrogen and carbon are in the form of 14N and 12C, respectively. Elemental abundances for CNO are obtained from CI, C2, CN, and CO lines. Difficulties in deriving the carbon abundance are discussed. Abundances of Na from NaI lines and S from SI lines are obtained. Elemental and isotopic CNO abundances suggest that HdC and RCB stars may be related objects and that they probably formed from a merger of a He white dwarf with a C-O white dwarf.
description: accepted for publication in The Astrophysical Journal (42 pages, 24 figures and 3 Tables)
Los Secretos de CCEGA: Lo Revelado y lo que está por Venir"
Creators: name: López Sánchez, Marc
Publisher: name: Zenodo
Year: 2025

description:  Este trabajo:

- Combina rigor científico con reflexión filosófica  

   - Presenta 10 principios verificados y 8 hipótesis por comprobar  

   - Estilo literario con elementos poéticos  

 

. **Estructura**:  

   - Resumen conceptual  

   - 2 secciones principales (Revelaciones/Secretos)  

   - 18 subsecciones numeradas  

   - Epílogo filosófico  

 

 **Notas de estilo**:  

    - Uso de notación matemática estándar ($\phi$, $V(\phi,R)$)  

    - Lenguaje metafórico controlado  

    - Citas poéticas como separadores  

 

. **Declaración de originalidad**:  

    "Este documento presenta por primera vez una síntesis completa de la teoría CCEGA, combinando resultados establecidos con fronteras especulativas de investigación."
Role of the radiative stage for cosmic ray acceleration in SNRs
Creators: name: Zirakashvili, V. N.
name: Ptuskin, V. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We consider diffusive shock acceleration in supernova remnants throughout their evolution including a radiative stage. It is found that a more efficient acceleration and fast exit of particles at the radiative stage results in the hardening of the source cosmic ray proton and electron spectra at energies $\sim 100-500$ GeV. The effect is stronger for cosmic ray electrons.
description: 8 pages, 8 figures, accepted to MNRAS. arXiv admin note: text overlap with arXiv:1701.00844
Measurements of the Cross-Section for the $t\bar{t}$ + Heavy-Flavor Production at the LHC
Creators: name: D'Hondt, Jorgen
name: Kim, Tae Jeong
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: At the LHC, the process of a Higgs boson decaying into bottom or charm quarks produced in association with a pair of top quarks, ttbarH , allows for an empirical exploration of the heavy-flavor quark Yukawa couplings to the Higgs boson. Accordingly, the cross-sections for the $t\bar{t}$ + heavy-flavor production without the appearance of the Higgs boson have been measured at the LHC in various phase spaces using data samples collected in pp collisions at $\sqrt{s}$ = 7, 8 and 13 TeV with the ATLAS and CMS experiments. Flavor ratios of cross-sections of $t\bar{t}$ + heavy-flavors to $t\bar{t}$ + additional jets processes are also measured. In this paper, the measured cross-sections and ratios are reviewed and the prospects with more data are presented.
description: 20 pages, 13 figures
In meiner eigenen Erfahrung
Creators: name: Koenig, Gottfried Michael
Publisher: name: Musica/Tecnologia
Year: 2010

description: Gottfried Michael Koenig goes over the terms of the relationship with the technology in relation to his experience, considering the fundamental steps with the objective of establishing some steady points. These considerations lead him to reaffirm the primacy of the compositional idea on the technological means, a principle which he considers even more valid today, where technology certainly can be used, but to which any moral authority cannot be delegated.
description: Musica/Tecnologia, IV (2010)
ZAMONAVIY TA'LIMDA KOMILJON OTANIYOZOV IJODI VOSITASIDA MA'NAVIY-MA'RIFIY TARBIYA MASALALARI
Creators: name: Yo'ldoshev, Sarvarbek
Publisher: name: Zenodo
Year: 2025

description: Mazkur tezisda Komiljon Otaniyozovning boy ijodiy merosi zamonaviy ta’lim tizimida ma’naviy-ma’rifiy tarbiyani shakllantirishda qanday pedagogik imkoniyatlarga ega ekani tahlil etiladi. Xalq og‘zaki ijodiyoti, milliy qo‘shiqlar va dostonlar orqali yoshlarda Vatanga muhabbat, yuksak axloqiy fazilatlar, tarixiy xotiraga hurmat singari qadriyatlarni shakllantirish masalalari ochib beriladi.
Spontaneous mechanical oscillation of a DC driven single crystal
Creators: name: Phan, Kim L.
name: Steeneken, Peter G.
name: Goossens, Martijn J.
name: Koops, Gerhard E. J.
name: Verheijden, Greja J. A. M.
name: van Beek, Joost T. M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: There is a large interest to decrease the size of mechanical oscillators since this can lead to miniaturization of timing and frequency referencing devices, but also because of the potential of small mechanical oscillators as extremely sensitive sensors. Here we show that a single crystal silicon resonator structure spontaneously starts to oscillate when driven by a constant direct current (DC). The mechanical oscillation is sustained by an electrothermomechanical feedback effect in a nanobeam, which operates as a mechanical displacement amplifier. The displacement of the resonator mass is amplified, because it modulates the resistive heating power in the nanobeam via the piezoresistive effect, which results in a temperature variation that causes a thermal expansion feedback-force from the nanobeam on the resonator mass. This self-amplification effect can occur in almost any conducting material, but is particularly effective when the current density and mechanical stress are concentrated in beams of nano-scale dimensions.
SiamTrans: Zero-Shot Multi-Frame Image Restoration with Pre-Trained Siamese Transformers
Creators: name: Liu, Lin
name: Yuan, Shanxin
name: Liu, Jianzhuang
name: Guo, Xin
name: Yan, Youliang
name: Tian, Qi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We propose a novel zero-shot multi-frame image restoration method for removing unwanted obstruction elements (such as rains, snow, and moire patterns) that vary in successive frames. It has three stages: transformer pre-training, zero-shot restoration, and hard patch refinement. Using the pre-trained transformers, our model is able to tell the motion difference between the true image information and the obstructing elements. For zero-shot image restoration, we design a novel model, termed SiamTrans, which is constructed by Siamese transformers, encoders, and decoders. Each transformer has a temporal attention layer and several self-attention layers, to capture both temporal and spatial information of multiple frames. Only pre-trained (self-supervised) on the denoising task, SiamTrans is tested on three different low-level vision tasks (deraining, demoireing, and desnowing). Compared with related methods, ours achieves the best performances, even outperforming those with supervised learning.
Spaces used by community theatre groups in British Columbia
Creators: name: Long, Gordon Arthur
Publisher: name: University of British Columbia
Year: 2010

description: This thesis comprises a description and analysis of selected theatre spaces used by community theatre groups in British Columbia. Following preliminary research, sixteen examples were chosen from the approximately one hundred spaces used by these groups, as being a typical cross-section of the available facilities. These examples were surveyed by the author and, where possible, interviews were conducted with those people responsible for their design and/or operation. For purposes of analysis, theatre spaces were divided into five classifications: 1) found space, 2) conversion, 3) gymnasium box, 4) multi-purpose auditorium, and 5) buildings designed exclusively for theatrical production. In the final stage of investigation one example was chosen from each category for a more intensive survey. These five spaces were then analyzed as to their suitability for amateur production. The method used was comparison of the data was surveyed with criteria established by: 1) literature on theatre architecture, 2) professional theatre personnel, and 3) community theatre personnel who had worked in the sample building. It was possible to reach, from this research, some general conclusions regarding spaces used by community theatre groups. The general conclusion was that, in most cases, the spaces used were not suitable for theatrical production. This problem was attributed to a lack of funds and to a lack of theatrical knowledge on the part of designers of these spaces. A corresponding factor which was found to influence the quality of community theatre production was the improper use of the spaces available. Again the problem could be traced to lack of knowledge of alternatives. From the information gathered, it was possible to make general recommendations for those wishing to improve their theatre space or to construct a new building, and also for government agencies wishing to be of assistance to community theatre groups.
La scrittura delle carte bresciane del secolo XII
Creators: name: Pantarotto, Martina
Publisher: name: Scrineum Rivista
Year: 2013
Subjects: paleography; Brescia; notaries’ script

description: Generally considered as the period in which a lot of factors (both within and outside the notarial practice) made the gap between books and documents handwriting become narrower, and the influence of the former increased on the latter, 12th century was characterized also in Brescia by a shared adaptation of notaries' script to the ancient and prestigious model of littera antiqua. The new 'diplomatic minuscule', documented since the very first years of the century by excellent (though isolated) cases (like the graphic experiences of iudex Ebezo and Rodulfus), became a widespread legacy among Brescia notaries in the mid-1150's. The papers aims at analyzing these graphical processes till to the resumption of a more cursive writing and the introduction of 'secondary' ligatures, that frankly foreshadow the most typical 13th century documentary script.
description: Scrineum Rivista, 3 (2005)
Implementacje strategii zmiany. Próba bilansu
Creators: name: Jach, Anna
Publisher: name: Zenodo
Year: 2017
Subjects: rewolucja
rosja
zmiana
ngo
demokracja

description: Rewolucja rosyjska. Spuścizna. „Implementacje strategii” zmiany, 2017 „Implementacje strategii” zmiany. Próba bilansu, [w: ] Rewolucja rosyjska. Spuścizna. „Implementacje strategii” zmiany, red. A. Jach, Wydawnictwo Księgarnia Akademicka, Kraków 2017; seria wydawnicza Rosja. Wczoraj, dziś, jutro. Polityka - kultura – religia - gospodarka, red. J. Diec, A. Jach, M. Kuryłowicz, t. 21, ss. 205 – 216.
Dynamical dark energy can amplify the expansion rate of the Universe
Creators: name: Zhang, Hai-Chao
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: By adding a matter-coupled dark energy field to Einstein's General Relativity (GR), this paper proves that the dynamical dark energy field can change the frequency of photons from distant galaxies as well as from background radiation of remote Universe. Therefore, when the observed frequency-shift of the photons is entirely attributed to the temporal variation of the cosmic scale factor, the calculated expansion rate of the Universe will be slightly greater than its actual value. The predicted values of the temperature of the cosmic blackbody radiation in the past (future) of the Universe are slightly larger (gradually smaller and smaller) than those in the standard cosmology. Since the blackbody radiation becomes the present cosmic microwave background (CMB) and its present-day temperature is directly estimated according to the Planck's law of blackbody radiation, the measured value of the CMB temperature is independent of whether to consider the scalar field or not.
description: 15 pages,4 figures
Leading edge bluntness effects on the hypersonic flow over the double-wedge at multiple aft-wedge angles
Creators: name: Ray, Anurag Adityanarayan
name: De, Ashoke
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The present numerical investigation focuses on the leading edge bluntness effects on the double-wedge with varied aft-wedge angles exposed to low enthalpy hypersonic free stream conditions. The bluntness ratio in this study varies, ranging from R/L1 = 0 (sharp leading edge) to R/L1 = 0.577 (maximum allowable bluntness), along with the aft-wedge angle varying between θ2 = 450 and 600. Noticeably, even a small bluntness ratio can completely change the shock interaction pattern compared to its sharp geometrical counterpart due to a detached leading edge shock, enlarged separation bubble, and location of various shock-waves concerning it. Critical bluntness ratios exist for the low aft-wedge θ2 = 450 angle, but increasing the aft-wedge angle makes the flow field highly unsteady for some bluntness ratios. Nevertheless, these bluntness ratios for such double-wedge configurations are reported using the mean of separation bubble size. Moreover, this work unravels the cause of such unsteadiness for the unsteady flow-fields using the spatial-temporal evolution of the wall pressure distribution, Fast Fourier Transform (FFT) of the pressure fluctuation signal at the compression corner and supports the deduced observation with the help of energy-based Proper Orthogonal Decomposition (POD). The increased shock-boundary layer interaction strength moves the separation point upstream beyond the junction of cylindrical bluntness and inclined fore-wedge surface, accompanying sudden change in its direction of motion that perturb the shear layer that set to a self-sustained, highly unsteady flow field.
Comment: Citation Statistics
Creators: name: Spiegelhalter, David
name: Goldstein, Harvey
Publisher: name: arXiv
Year: 2009
Subjects: subject: Methodology (stat.ME)
subject: Digital Libraries (cs.DL)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Comment on "Citation Statistics" [arXiv:0910.3529]
description: Published in at http://dx.doi.org/10.1214/09-STS285C the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A Review for Japanese auroral records on the three extreme space weather events around the International Geophysical Year (1957 -- 1958)
Creators: name: Hayakawa, Hisashi
name: Ebihara, Yusuke
name: Hata, Hidetoshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Solar Cycle 19 was probably the greatest solar cycle over the last four centuries and significantly disrupted the solar-terrestrial environments with a number of solar eruptions and resultant geomagnetic storms. At its peak, the International Geophysical Year (IGY: 1957 -- 1958) was organised by international collaborations and benefitted scientific developments, capturing multiple unique extreme space weather events including the third and fourth greatest geomagnetic storms in the space age. In this article, we review and analyse original records of Japanese auroral observations around the IGY. These observations were organised by Masaaki Huruhata in collaboration with professional observatories and citizen contributors. We have digitised and documented these source documents, which comprise significant auroral displays in March 1957 (minimum Dst = -255 nT), September 1957 (minimum Dst = -427 nT), and February 1958 (minimum Dst = -426 nT). These records allow us to visualise temporal and spatial evolutions of these auroral displays, reconstruct their equatorward auroral boundaries down to 41.4°, 38.3°, and 33.3° in invariant latitudes, and contextualise their occurrences following contemporary geomagnetic disturbances. Our results have been compared with significant auroral displays during other extreme space weather events. These aurorae generally showed reddish colourations occasionally with yellowish rays. Their colourations are attributed to reddish oxygen emission and its mixture with greenish oxygen emission. Overall, these archival records provide the references for future discussions on the auroral activities during the uniquely intense and extreme space weather events.
description: 29 pages, 15 figures, and 1 table; accepted for publication in Geoscience Data Journal
18 Million Links in Commit Messages: Purpose, Evolution, and Decay
Creators: name: Xiao, Tao
name: Baltes, Sebastian
name: Hata, Hideaki
name: Treude, Christoph
name: Kula, Raula Gaikovina
name: Ishio, Takashi
name: Matsumoto, Kenichi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Commit messages contain diverse and valuable types of knowledge in all aspects of software maintenance and evolution. Links are an example of such knowledge. Previous work on "9.6 million links in source code comments" showed that links are prone to decay, become outdated, and lack bidirectional traceability. We conducted a large-scale study of 18,201,165 links from commits in 23,110 GitHub repositories to investigate whether they suffer the same fate. Results show that referencing external resources is prevalent and that the most frequent domains other than github.com are the external domains of Stack Overflow and Google Code. Similarly, links serve as source code context to commit messages, with inaccessible links being frequent. Although repeatedly referencing links is rare (4%), 14% of links that are prone to evolve become unavailable over time; e.g., tutorials or articles and software homepages become unavailable over time. Furthermore, we find that 70% of the distinct links suffer from decay; the domains that occur the most frequently are related to Subversion repositories. We summarize that links in commits share the same fate as links in code, opening up avenues for future work.
Probing the Peculiar Behavior of GRS 1915+105 at Near-Eddington Luminosity
Creators: name: Vierdayanti, K.
name: Mineshige, S.
name: Ueda, Y.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: To understand the nature of supercritical accretion, we systematically analyze the {\it RXTE}/PCA data of GRS 1915+105 in its quasi-steady states, by choosing data with small variability during 1999 -- 2000. We apply a multicolor disk plus a thermal Comptonization model and take into consideration accurate interstellar absorption, a reflection component, and absorption features from the disk wind self-consistently. There is a strong correlation between the inner disk temperature and the fraction of the disk component. Most of the Comptonization-dominated spectra show $T_{\rm in} \sim 1$ keV with a high electron temperature of $>10$ keV, which may correspond to the very high state in canonical black hole X-ray binaries (BHBs). By contrast, the disk-dominated spectra have $T_{\rm in} \sim 2$ keV with a low temperature ($<10$ keV) and optically thick Comptonization, and show two separate branches in the ($L$ -- $T_{\rm in}$) diagram. The lower branch clearly follows the $L \propto T_{\rm in}^4$-track. Furthermore, applying the extended disk blackbody model, we find that 9 out of 12 datasets with disk luminosity above $0.3 L_{\rm E}$ prefer a flatter temperature gradient than that in the standard disk ($p < 0.7$). We interpret that, in the lower branch, the disk extends down to the innermost stable circular orbit, and is most probably in the slim disk state. A rapidly spinning black hole can explain both the lack of the $L \propto T_{\rm in}^2$-track and a high value of spectral hardening factor ($\sim 4$) that would be required for a non-rotating black hole. The spectra in the upper branch are consistent with the picture of a truncated disk with low temperature Comptonization. This state is uniquely observed from GRS 1915+105 among BHBs, which may be present at near-Eddington luminosity.
description: 17 pages, 12 figures, 4 tables, accepted for publication in PASJ
Product Information Browsing Support System Using Analytic Hierarchy Process
Creators: name: Li, Weijian
name: Kikuchi, Masato
name: Ozono, Tadachika
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Large-scale e-commerce sites can collect and analyze a large number of user preferences and behaviors, and thus can recommend highly trusted products to users. However, it is very difficult for individuals or non-corporate groups to obtain large-scale user data. Therefore, we consider whether knowledge of the decision-making domain can be used to obtain user preferences and combine it with content-based filtering to design an information retrieval system. This study describes the process of building a product information browsing support system with high satisfaction based on product similarity and multiple other perspectives about products on the Internet. We present the architecture of the proposed system and explain the working principle of its constituent modules. Finally, we demonstrate the effectiveness of the proposed system through an evaluation experiment and a questionnaire.
description: 6 pages, 5 figures, IEEE/WIC/ACM International Conference on Web Intelligence (WI-IAT'21)
Topological crossovers in the forced folding of self-avoiding matter
Creators: name: Balankin, Alexander S.
name: Matamoros, Daniel Morales
name: Leon, Ernesto Pineda
name: Rangel, Antonio Horta
name: Cruz, Miguel Angel Martinez
name: Ochoa, Didier Samayoa
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the scaling properties of forced folding of thin materials of different geometry. The scaling relations implying the topological crossovers from the folding of threedimensional plates to the folding of two-dimensional sheets, and further to the packing of one-dimensional strings, are derived for elastic and plastic manifolds. These topological crossovers in the folding of plastic manifolds were observed in experiments with predominantly plastic aluminum strips of different geometry. Elasto-plastic materials, such as paper sheets during the (fast) folding under increasing confinement force, are expected to obey the scaling force-diameter relation derived for elastic manifolds. However, in experiments with paper strips of different geometry, we observed the crossover from packing of one-dimensional strings to folding two dimensional sheets only, because the fractal dimension of the set of folded elasto-plastic sheets is the thickness dependent due to the strain relaxation after a confinement force is withdrawn.
description: 39 pages, 6 figures
Pieriestrojka - reformowanie spuścizny rewolucji
Creators: name: Jach, Anna
Publisher: name: Zenodo
Year: 2017
Subjects: pieriestrojka
reolucja
rosja
demokracja

description: Pieriestrojka – reformowanie spuścizny rewolucji, [w: ] Rewolucja rosyjska. Spuścizna. „Implementacje strategii” zmiany, red. A. Jach, Wydawnictwo Księgarnia Akademicka, Kraków 2017; seria wydawnicza Rosja. Wczoraj, dziś, jutro. Polityka - kultura – religia - gospodarka, red. J. Diec, A. Jach, M. Kuryłowicz, t. 21, ss. 157 – 187.
ML Supported Predictions for SAT Solvers Performance
Creators: name: Leventi-Peetz, A. -M.
name: Peetz, Jörg-Volker
name: Rohde, Martina
Publisher: name: arXiv
Year: 2021
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In order to classify the indeterministic termination behavior of the open source SAT solver CryptoMiniSat in multi-threading mode while processing hard to solve boolean satisfiability problem instances, internal solver runtime parameters have been collected and analyzed. A subset of these parameters has been selected and employed as features vector to successfully create a machine learning model for the binary classification of the solver's termination behavior with any single new solving run of a not yet solved instance. The model can be used for the early estimation of a solving attempt as belonging or not belonging to the class of candidates with good chances for a fast termination. In this context a combination of active profiles of runtime characteristics appear to mirror the influence of the solver's momentary heuristics on the immediate quality of the solver's resolution process. Because runtime parameters of already the first two solving iterations are enough to forecast termination of the attempt with good success scores, the results of the present work deliver a promising basis which can be further developed in order to enrich CryptoMiniSat or generally any modern SAT solver with AI abilities.
description: Presented at the Future Technologies Conference (FTC) 2019
Enhanced stochastic oscillations in autocatalytic reactions
Creators: name: Dauxois, Thierry
name: Di Patti, Francesca
name: Fanelli, Duccio
name: McKane, Alan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a simplified scheme of $k$ coupled autocatalytic reactions, previously introduced by Togashi and Kaneko. The role of stochastic fluctuations is elucidated through the use of the van Kampen system-size expansion and the results compared with direct stochastic simulations. Regular temporal oscillations are predicted to occur for the concentration of the various chemical constituents, with an enhanced amplitude resulting from a resonance which is induced by the intrinsic graininess of the system. The associated power spectra are determined and have a different form depending on the number of chemical constituents, $k$. We make detailed comparisons in the two cases $k=4$ and $k=8$. Agreement between the theoretical and numerical results for the power spectrum are good in both cases. The resulting spectrum is especially interesting in the $k=8$ system, since it has two peaks, which the system-size expansion is still able to reproduce accurately.
description: Submitted to Phys. Rev. E
Nonuniversal dynamic conductance fluctuations in disordered systems
Creators: name: Cherroret, N.
name: Pena, A.
name: Chabanov, A. A.
name: Skipetrov, S. E.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Sample-to-sample fluctuations of the time-dependent conductance of a system with static disorder have been studied by means of diagrammatic theory and microwave pulsed transmission measurements. The fluctuations of time-dependent conductance are not universal, i.e., depend on sample parameters, in contrast to the universal conductance fluctuations in the steady-state regime. The variance of normalized conductance, determined by the infinite-range intensity correlation C_3(t), is found to increase as a third power of delay time from an exciting pulse, t. C_3(t) grows larger than the long-range intensity correlation C_2(t) after a time t_q ~ ^{1/2} t_D (t_D being the diffusion time, being the average dimensionless conductance).
description: Revised version, 6 pages, 5 figures
Emergence of pseudo-time during optimal Monte Carlo sampling and temporal aspects of symmetry breaking and restoration
Creators: name: He, Yang
name: Lubchenko, Vassiliy
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We argue that one can associate a pseudo-time with sequences of configurations generated in the course of classical Monte Carlo simulations for a single-minimum bound state, if the sampling is optimal. Hereby the sampling rates can be, under special circumstances, calibrated against the relaxation rate and frequency of motion of an actual physical system. The latter possibility is linked to the optimal sampling regime being a universal crossover separating two distinct suboptimal sampling regimes analogous to the physical phenomena of diffusion and effusion, respectively. Bound states break symmetry; one may thus regard the pseudo-time as a quantity emerging together with the bound state. Conversely, when transport among distinct bound states takes place -- thus restoring symmetry -- a pseudo-time can no longer be defined. One can still quantify activation barriers, if the latter barriers are smooth, but the simulation becomes impractically slow and pertains to overdamped transport only. Specially designed Monte Carlo moves that bypass activation barriers -- so as to accelerate sampling of the thermodynamics -- amount to effusive transport and lead to severe under-sampling of transition-state configurations that separate distinct bound states while destroying the said universality. Implications of the present findings for simulations of glassy liquids are discussed.
Random walks on networks: cumulative distribution of cover time
Creators: name: Zlatanov, Nikola
name: Kocarev, Ljupco
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We derive an exact closed-form analytical expression for the distribution of the cover time for a random walk over an arbitrary graph. In special case, we derive simplified exact expressions for the distributions of cover time for a complete graph, a cycle graph, and a path graph. An accurate approximation for the cover time distribution, with computational complexity of O(2n), is also presented. The approximation is numerically tested only for graphs with n<=1000 nodes.