cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Initiation Mechanism of the First On-disk X-Class Flare of Solar Cycle 25
Creators: name: Duan, Aiying
name: Jiang, Chaowei
name: Zhou, ZhenJun
name: Feng, Xueshang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this paper we study the initiation mechanism of the first on-disk X-class eruptive flare in solar cycle 25. Coronal magnetic field reconstructions reveal a magnetic flux rope (MFR) with configuration highly consistent with a filament existing for a long period before the flare, and the eruption of the whole filament indicates that the MFR erupted during the flare. However, quantitative analysis shows that the pre-flare MFR resides in a height too low to trigger a torus instability (TI). The filament experienced a slow rise before the flare onset, for which we estimate evolution of the filament height using a triangulation method by combining the SDO and STEREO observations, and find it is also much lower than the critical height for triggering TI. On the other hand, the pre-flare evolution of the current density shows progressive thinning of a vertical current layer on top of the flare PIL, which suggests that a vertical current sheet forms before the eruption. Meanwhile, there is continuously shearing motion along the PIL under the main branch of the filament, which can drive the coronal field to form such a current sheet. As such, we suggest that the event follows a reconnection-based initiation mechanism as recently established using a high-accuracy MHD simulation, in which an eruption is initiated by reconnection in a current sheet that forms gradually within continuously-sheared magnetic arcade. The eruption should be further driven by TI as the filament quickly rises into the TI domain during the eruption.
A sufficient condition for the existence of plane spanning trees on geometric graphs
Creators: name: Rivera-Campo, Eduardo
name: Urrutia-Galicia, Virginia
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: Computational Geometry (cs.CG)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05C62

description: Let P be a set of n > 2 points in general position in the plane and let G be a geometric graph with vertex set P. If the number of empty triangles uvw in P for which the subgraph of G induced by {u,v,w} is not connected is at most n-3, then G contains a non-self intersecting spanning tree.
description: Accepted for publication in Computational Geometry: Theory and Applications
Parasites as indicators of populations and species of rockfishes: (Sebastes: Scorpaenidae) of the northeastern Pacific Ocean
Creators: name: Sekerak, Aaron Daniel
Publisher: name: University of Calgary
Year: 1975
Subjects: subject: QL 638 S42 S43 1975 Microfiche
subject: Sebastes - Parasites

description: Bibliography: p. 240-251.
description: Parasitological data were used to investigate relationships of various species of rockfishes (Sebastes Cuvier, 1829) in the northeastern Pacific Ocean. Hesults indicated that different stocks of Sebastes alutus (Gilbert, 1890) are present along the continental shelf off the southwestern coast of Vancouver Island, British Columbia; in Queen Charlotte Sound and in the Gulf of Alaska, which can be differentiated through the intensities of infection of certain metazoan parasite species. Differences in the parasite fauna of S. alutus were also correlated with depth of capture and size of the host. Season of capture and sex of the host did not appear to influence the parasite faunas of S. alutus. Eight of the sixteen species of rockfishes obtained from Queen Charlotte Sound appeared to harbour parasites which could be used to differentiate host species. Large differences between the parasites of inshore and offshore rockfishes were observed. Species of inshore rockfishes could also be differentiated through the intensities of infection of their parasites. None of the parasites recovered exhibited strict host specificity; however, specificity to the genus Sebastes appeared to be rather well developed for most copepods and monogeneans. It is postulated that speciation may be occurring in some species of copepods and monogeneans as well as in the genus Sebastes.
Sudden Shock Waves in modified gravity
Creators: name: Antoniadis, Ignatios
name: Cotsakis, Spiros
name: Trachilis, Dimitrios
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a generic asymptotic solution for modified gravity near a sudden singularity. This solution contains a fluid source with no equation of state and is function-counting stable, that is it has eleven independent arbitrary functions of the spatial coordinates as dictated by the Cauchy problem of the theory. We further show that near the sudden singularity the solution has a shock wave character with the same number of free functions in the Jordan and Einstein frame.
description: v2: 14 pages, matches published version
Supplementary Material of Vivienne: Relational Verification of Cryptographic Implementations in WebAssembly
Creators: name: Tsoupidi, Rodothea Myrsini
name: Balliu, Musard
name: Baudry, Benoit
Publisher: name: Zenodo
Year: 2021

description: Supplemental material for the paper "Vivienne: Relational Verification of Cryptographic Implementations in WebAssembly".
Effect of the initial mass function on the dynamical SMBH mass estimate in the nucleated early-type galaxy FCC 47
Creators: name: Thater, Sabine
name: Lyubenova, Mariya
name: Fahrion, Katja
name: Martín-Navarro, Ignacio
name: Jethwa, Prashin
name: Nguyen, Dieu D.
name: van de Ven, Glenn
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Supermassive black holes (SMBHs) and nuclear star clusters (NSCs) co-exist in many galaxies. While the formation history of the black hole is essentially lost, NSCs preserve their evolutionary history imprinted onto their stellar populations and kinematics. Studying SMBHs and NSCs in tandem might help us to ultimately reveal the build-up of galaxy centres. In this study, we combine large-scale VLT/MUSE and high-resolution adaptive-optics-assisted VLT/SINFONI observations of the early-type galaxy FCC 47 with the goal being to assess the effect of a spatially (non-)variable initial mass function (IMF) on the determination of the mass of the putative SMBH in this galaxy. We achieve this by performing DYNAMITE Schwarzschild orbit-superposition modelling of the galaxy and its NSC. In order to properly take account of the stellar mass contribution to the galaxy potential, we create mass maps using a varying stellar mass-to-light ratio derived from single stellar population models with fixed and with spatially varying IMFs. Using the two mass maps, we estimate black hole masses of $(7.1^{+0.8}_{-1.1})\times 10^7\,M_{\odot}$ and $(4.4^{+1.2}_{-2.1}) \times 10^7\,M_{\odot}$ at $3σ$ signifance, respectively. Compared to models with constant stellar-mass-to-light ratio, the black hole masses decrease by 15% and 48%, respectively. Therefore, a varying IMF, both in its functional form and spatially across the galaxy, has a non-negligible effect on the SMBH mass estimate. Furthermore, we find that the SMBH in FCC 47 has probably not grown over-massive compared to its very over-massive NSC.
description: 23 pages 19 Figures, accepted for publication in A&A
The eight-vertex model and lattice supersymmetry
Creators: name: Hagendorf, Christian
name: Fendley, Paul
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that the XYZ spin chain along the special line of couplings J_xJ_y+J_xJ_z+J_yJ_z=0 possesses a hidden N=(2,2) supersymmetry. This lattice supersymmetry is non-local and changes the number of sites. It extends to the full transfer matrix of the corresponding eight-vertex model. In particular, it is shown how to derive the supercharges from Baxter's Bethe ansatz. This analysis leads to new conjectures concerning the ground state for chains of odd length. We also discuss a correspondence between the spectrum of this XYZ chain and that of a manifestly supersymmetric staggered fermion chain.
description: 40 pages, 6 figures, TikZ
Evaluation of plastic scintillator for mineral exploration by airborne gamma spectrometry
Creators: name: Schoenaich-Peters, Ralf G.
Publisher: name: University of Calgary
Year: 1973
Subjects: subject: QC 787 C6 S36 1972 Microfilm
subject: Scintillation counters
subject: Gamma ray spectrometry

description: Bibliography: p. 60-62.
Which Component of Solar Magnetic Field Drives the Evolution of Interplanetary Magnetic Field over Solar Cycle?
Creators: name: Yoshida, Minami
name: Shimizu, Toshifumi
name: Toriumi, Shin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The solar magnetic structure changes over the solar cycle. It has a dipole structure during solar minimum, where the open flux extends mainly from the polar regions into the interplanetary space. During maximum, a complex structure is formed with low-latitude active regions and weakened polar fields, resulting in spread open field regions. However, the components of the solar magnetic field that is responsible for long-term variations in the interplanetary magnetic field (IMF) are not clear, and the IMF strength estimated based on the solar magnetic field is known to be underestimated by a factor of 3 to 4 against the actual in-situ observations (the open flux problem). To this end, we decomposed the coronal magnetic field into the components of the spherical harmonic function of degree and order $(\ell, m)$ using the potential field source surface model with synoptic maps from SDO/HMI for 2010 to 2021. As a result, we found that the IMF rapidly increased in December 2014 (seven months after the solar maximum), which coincided with the increase in the equatorial dipole, $(\ell, m)=(1, \pm1)$, corresponding to the diffusion of active regions toward the poles and in the longitudinal direction. The IMF gradually decreased until December 2019 (solar minimum) and its variation corresponded to that of the non-dipole component $\ell\geq2$. Our results suggest that the understanding of the open flux problem may be improved by focusing on the equatorial dipole and the non-dipole component and that the influence of the polar magnetic field is less significant.
description: 19 pages, 9 figures, accepted for publication in ApJ
Two-proton emission and related phenomena
Creators: name: Pfützner, Marek
name: Mukha, Ivan
name: Wang, Simin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: One of characteristic phenomena for nuclei beyond the proton dripline is the simultaneous emission of two protons (2\emph{p}). The current status of our knowledge of this most recently observed and the least known decay mode is presented. First, different approaches to theoretical description of this process, ranging from effective approximations to advanced three-body models are overviewed. Then, after a brief survey of main experimental methods to produce 2\emph{p}-emitting nuclei and techniques to study their decays, experimental findings in this research field are presented and discussed. This review covers decays of short-lived resonances and excited states of unbound nuclei as well as longer-lived, ground-state radioactive decays. In addition, more exotic decays like three- and four-proton emission are addressed. Finally, related few-body topics, like two-neutron and four-neutron radioactivity, and the problem of the tetraneutron are shortly discussed.
description: 109 pages, 62 figures, accepted by Progress in Particle and Nuclear Physics
Soliton surfaces associated with symmetries of ODEs written in Lax representation
Creators: name: Grundland, A. M.
name: Post, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: 35Q53, 35Q58, 53A05

description: The main aim of this paper is to discuss recent results on the adaptation of the Fokas-Gel'fand procedure for constructing soliton surfaces in Lie algebras, which was originally derived for PDEs [Grundland, Post 2011], to the case of integrable ODEs admitting Lax representations. We give explicit forms of the $\g$-valued immersion functions based on conformal symmetries involving the spectral parameter, a gauge transformation of the wave function and generalized symmetries of the linear spectral problem. The procedure is applied to a symmetry reduction of the static $ϕ^4$-field equations leading to the Jacobian elliptic equation. As examples, we obtain diverse types of surfaces for different choices of Jacobian elliptic functions for a range of values of parameters.
description: 14 Pages, 2 figures Conference Proceedings for QST7 Prague
The genetics of qualitative and quantitative attributes in control, inbred and selected populations of Tribolium castaneum
Creators: name: Yeh, Francis C. H.
Publisher: name: University of Calgary
Year: 1974
Subjects: subject: QL 596 T2 Y43 1974 Microfiche
subject: Tribolium castaneum

description: Bibliography: p. 93-94.
Broadband study of GRB 091127: a sub-energetic burst at higher redshift?
Creators: name: Troja, E.
name: Sakamoto, T.
name: Guidorzi, C.
name: Norris, J. P.
name: Panaitescu, A.
name: Kobayashi, S.
name: Omodei, N.
name: Brown, J. C.
name: Burrows, D. N.
name: Evans, P. A.
name: Gehrels, N.
name: Marshall, F. E.
name: Mawson, N.
name: Melandri, A.
name: Mundell, C. G.
name: Oates, S. R.
name: Pal'shin, V.
name: Preece, R. D.
name: Racusin, J. L.
name: Steele, I. A.
name: Tanvir, N. R.
name: Vasileiou, V.
name: Wilson-Hodge, C.
name: Yamaoka, K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: GRB 091127 is a bright gamma-ray burst (GRB) detected by Swift at a redshift z=0.49 and associated with SN 2009nz. We present the broadband analysis of the GRB prompt and afterglow emission and study its high-energy properties in the context of the GRB/SN association. While the high luminosity of the prompt emission and standard afterglow behavior are typical of cosmological long GRBs, its low energy release, soft spectrum and unusual spectral lag connect this GRB to the class of sub-energetic bursts. We discuss the suppression of high-energy emission in this burst, and investigate whether this behavior could be connected with the sub-energetic nature of the explosion.
description: 12 pages, 7 figures, submitted to ApJ
Constraints on dark matter models from a Fermi LAT search for high-energy cosmic-ray electrons from the Sun
Creators: name: The Fermi LAT Collaboration
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: During its first year of data taking, the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope has collected a large sample of high-energy cosmic-ray electrons and positrons (CREs). We present the results of a directional analysis of the CRE events, in which we searched for a flux excess correlated with the direction of the Sun. Two different and complementary analysis approaches were implemented, and neither yielded evidence of a significant CRE flux excess from the Sun. We derive upper limits on the CRE flux from the Sun's direction, and use these bounds to constrain two classes of dark matter models which predict a solar CRE flux: (1) models in which dark matter annihilates to CREs via a light intermediate state, and (2) inelastic dark matter models in which dark matter annihilates to CREs.
description: 18 pages, 8 figures, accepted for publication in Physical Review D - contact authors: Francesco Loparco (loparco@ba.infn.it), M. Nicola Mazziotta (mazziotta@ba.infn.it) and Jennifer Siegal-Gaskins (jsg@mps.ohio-state.edu)
PTSD-relevant factors which contribute to mouse-models of fear inhibition: sex, sleep and circadian rhythms
Creators: name: JACOB WILLIAM CLARK
Publisher: name: Monash University
Year: 2020
Subjects: subject: 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology)
subject: FOS: Psychology

description: Posttraumatic stress disorder (PTSD) is a prevalent and debilitating form of psychiatric illness. Inhibition of trauma-associated fear is critical for treatment and recovery from PTSD. However, fear inhibition impairment is a primary feature of this condition and likely contributes to poor treatment outcomes. This thesis examines the effects of factors associated with PTSD (sex differences, circadian disruption and REM sleep modulation) on mouse models of fear inhibition. Results of this thesis provide insight into factors which contribute to a fundamental mechanism of PTSD (fear inhibition) and may have important implications for understanding and treatment of this condition.
Effects of isovaline and ACBC on tonic and acute nociceptive models in rodents
Creators: name: Chung, Cheryl C.W.
Publisher: name: University of British Columbia
Year: 2009

description: Chronic pain is a prevalent problem in society and is inadequately managed using current analgesics. Central disinhibition, produced by dysregulation of excitatory or inhibitory signaling, is responsible for most, if not all, chronic pain states. In particular, an impairment of glycinergic and GABAergic pathways is associated with hypersensitivity and allodynia. Selectively restoration of such inhibitory signaling will likely be of therapeutic value. We explored this hypothesis by characterizing in vivo effects of novel analgesics isovaline and 1-amino-cyclobutane carboxylic acid (ACBC), using a broad spectrum of acute, tonic and chronic pain models. At all doses tested, neither isovaline nor ACBC have appreciable effects on heart rate, breathing rate or behaviour in rodents. They decreased both formalin-induced phase I and II paw licking response. The effect of isovaline and ACBC on monosodium iodoacetate- (MIA-) induced osteoarthritis in rats could not be evaluated due to large interanimal variability. However, behavioural assays for mouse osteoarthritis were examined; of these, the inverted wire mesh was the most promising. A substantial decrease of hind paw grip duration was observed in MIA-treated animals which lasted for over 21 days. The grip impairment was reversed by morphine, but not diclofenac, on day 14 only. Isovaline and ACBC are effective in heat-induced acute nociceptive models in mice. Both compounds increased tail flick latency in the hot water tail immersion assay with a non-sigmoidal dose-response relationship, in which middle, but not higher doses were efficacious. A similar pattern of dose-response was observed in the hotplate model for ACBC. High dose isovaline did not change latency to paw licking on the hotplate. The effects of intraplantar administration of glutamate in mice have also been examined. Peripheral glutamate elicited paw licking and allodynia in a dose-dependent fashion. Paw licking response was blocked by co-administration of ACBC, while isovaline was not effective. These results indicate both compounds have antinociceptive properties without obvious side effects. They likely have mixed effects on different receptor systems. Further exploration is required to elucidate their mechanisms of action. However restoration of central inhibition appears to be a route for the discovery of new analgesics.
On Sequential Single-Pion Production in Double-Pionic Fusion
Creators: name: Bashkanov, M.
name: Clement, H.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Recently a two-step process has been proposed for the double-pionic fusion to deuterium $pn (I=0) \to dπ^+π^-$. Its calculation is solely based on total cross section data for the two sequential single-pion production steps $pn (I=0)\to ppπ^-$ followed by $pp \to dπ^+$. Though this sequential process was aimed to explain the dibaryon resonance $d^*(2380)$ peak in double-pionic fusion, we demonstrate that this is not the case. It rather fits to a possible broad bump at 2.31 GeV in the energy dependence of the $pn \to dπ^0π^0$ reaction, which was recently interpreted as a consequence of dibaryonic excitations in isoscalar single-pion production.
Study Of Energy Requirement For Maize Cultivation In Panchmahal District Of Middle Gujarat
Creators: name: Parth G. Patel*, Akhil C. Bhut
Publisher: name: Zenodo
Year: 2016

description: Energy analysis of crop production is essential to find out the current energy requirement as well as the future demand of energy in crop cultivation. A survey was conducted through structured questionnaire to 93 randomly selected farmers in four villages (Jakhripura, Kandach, Kankanpur and Ganagata) of talukas Godhra, Khanpur and Kalol. The raw data obtained were analyzed after converting data into energy equivalents. It was concluded that fertilizer application consumed maximum operation wise energy with a value of 7010.55 MJ/ha followed by seed bed preparation with the value of 3684.72 MJ/ha. According to source wise, chemical fertilizer consumed maximum energy, about 36.09 % of total energy consumption and then after fuel energy 22.62 % of total energy consumption. The total input energy requirement for maize production in Panchmahals district 18831.07 MJ/ha. Total output energy for   maize cultivation was 83894.62  MJ/ha. Energy productivity of maize in the study area was found to be 0.25 kg/MJ. The net energy return from the cultivation of maize in Panchmahal district is 65063.55 MJ/ha
Numerical study of hot strongly interacting matter
Creators: name: Petreczky, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: I review recent progress in study of strongly interacting matter at high temperatures using Monte-Carlo simulations in lattice QCD.
description: Talk presented at Conference on Computational Physics, Oct. 30 - Nov. 3, 2011, Gatlinburg TN, LaTeX uses jpconf11.clo, jpconf.cls
A Mean-field Approach for an Intercarrier Interference Canceller for OFDM
Creators: name: Sakata, Ayaka
name: Kabashima, Yoshiyuki
name: Peleg, Yitzhak
Publisher: name: arXiv
Year: 2012
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The similarity of the mathematical description of random-field spin systems to orthogonal frequency-division multiplexing (OFDM) scheme for wireless communication is exploited in an intercarrier-interference (ICI) canceller used in the demodulation of OFDM. The translational symmetry in the Fourier domain generically concentrates the major contribution of ICI from each subcarrier in the subcarrier's neighborhood. This observation in conjunction with mean field approach leads to a development of an ICI canceller whose necessary cost of computation scales linearly with respect to the number of subcarriers. It is also shown that the dynamics of the mean-field canceller are well captured by a discrete map of a single macroscopic variable, without taking the spatial and time correlations of estimated variables into account.
description: 7pages, 3figures
X-ray Polarimetry of the accreting pulsar 1A~0535+262 in the supercritical state with PolarLight
Creators: name: Long, Xiangyun
name: Feng, Hua
name: Li, Hong
name: Kong, Ling-Da
name: Heyl, Jeremy
name: Ji, Long
name: Tao, Lian
name: Muleri, Fabio
name: Wu, Qiong
name: Zhu, Jiahuan
name: Huang, Jiahui
name: Minuti, Massimo
name: Jiang, Weichun
name: Citraro, Saverio
name: Nasimi, Hikmat
name: Yu, Jiandong
name: Jin, Ge
name: Zeng, Ming
name: An, Peng
name: Baldini, Luca
name: Bellazzini, Ronaldo
name: Brez, Alessandro
name: Latronico, Luca
name: Sgrò, Carmelo
name: Spandre, Gloria
name: Pinchera, Michele
name: Soffitta, Paolo
name: Costa, Enrico
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The X-ray pulsar 1A 0535+262 exhibited a giant outburst in 2020, offering us a unique opportunity for X-ray polarimetry of an accreting pulsar in the supercritical state. Measurement with PolarLight yielded a non-detection in 3-8 keV; the 99% upper limit of the polarization fraction (PF) is found to be 0.34 averaged over spin phases, or 0.51 based on the rotating vector model. No useful constraint can be placed with phase resolved polarimetry. These upper limits are lower than a previous theoretical prediction of 0.6-0.8, but consistent with those found in other accreting pulsars, like Her X-1, Cen X-3, 4U 1626-67, and GRO J1008-57, which were in the subcritical state, or at least not confidently in the supercritical state, during the polarization measurements. Our results suggest that the relatively low PF seen in accreting pulsars cannot be attributed to the source not being in the supercritical state, but could be a general feature.
description: accepted for publication in ApJ
An enigma of Przybylski's star: is there promethium on its surface?
Creators: name: Andrievsky, Sergei M.
name: Korotin, Sergey A.
name: Werner, Klaus
name: Kovtyukh, Valery V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We carried out a new attempt to check for the presence promethium lines in the spectrum of HD101065 (Przybylski's star). The neutron capture element promethium does not have stable isotopes and the maximum half-life time is about 18 years. Thus its presence in this peculiar star would indicate an ongoing process of irradiation of its surface layers with free neutrons. Unfortunately, almost all promethium lines are heavily blended with lines of other neutron capture elements and other species. We selected and analysed three lines of promethium (Pm I and Pm II) and came to the conclusion that at present it is impossible to definitely claim the presence of this element in Przybylski's star atmosphere.
description: Accepted for publication in Astronomische Nachrichten
The Laplace equation for the exterior of the Hankel contour and novel identities for hypergeometric functions
Creators: name: Fokas, A. S.
name: Glasser, M. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 31A25, 33c20

description: By employing conformal mappings, it is possible to express the solution of certain boundary value problems for the Laplace equation in terms of a single integral involving the given boundary data. We show that such explicit formulae can be used to obtain novel identities for special functions. A convenient tool for deriving this type of identities is the so-called \emph{global relation}, which has appeared recently in a wide range of boundary value problems. As a concrete application, we analyze the Neumann boundary value problem for the Laplace equation in the exterior of the so-called Hankel contour, which is the contour that appears in the definition of both the gamma and the Riemann zeta functions. By utilizing the explicit solution of this problem, we derive a plethora of novel identities involving the hypergeometric function.
Learning Analytics Dashboards for Advisors -- A Systematic Literature Review
Creators: name: Vemula, Suchith Reddy
name: Moraes, Marcia
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Learning Analytics Dashboard for Advisors is designed to provide data-driven insights and visualizations to support advisors in their decision-making regarding student academic progress, engagement, targeted support, and overall success. This study explores the current state of the art in learning analytics dashboards, focusing on specific requirements for advisors. By examining existing literature and case studies, this research investigates the key features and functionalities essential for an effective learning analytics dashboard tailored to advisor needs. This study also aims to provide a comprehensive understanding of the landscape of learning analytics dashboards for advisors, offering insights into the advancements, opportunities, and challenges in their development by synthesizing the current trends from a total of 21 research papers used for analysis. The findings will contribute to the design and implementation of new features in learning analytics dashboards that empower advisors to provide proactive and individualized support, ultimately fostering student retention and academic success.
Prerequisite Structure Discovery in Intelligent Tutoring Systems
Creators: name: Annabi, Louis
name: Nguyen, Sao Mai
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This paper addresses the importance of Knowledge Structure (KS) and Knowledge Tracing (KT) in improving the recommendation of educational content in intelligent tutoring systems. The KS represents the relations between different Knowledge Components (KCs), while KT predicts a learner's success based on her past history. The contribution of this research includes proposing a KT model that incorporates the KS as a learnable parameter, enabling the discovery of the underlying KS from learner trajectories. The quality of the uncovered KS is assessed by using it to recommend content and evaluating the recommendation algorithm with simulated students.
James Boswell's A letter to the people of Scotland, 1785 - an anotated and critical edition
Creators: name: Brunner, Dana E.
Publisher: name: University of Calgary
Year: 1975
Subjects: subject: DA 811 B66 1975 Microfiche
subject: Scotland. Court of Session

description: Bibliography: p. 105-109.
description: This work is an attempt to make available, in a scholarly and critical edition, a minor text of James Boswell, A Letter to the People of Scotland on the Alarming Attempt to Infringe the Articles of the Union, and Introduce a most Pernicious Innovation, by Diminishing the Number of the Lords of Session, 1785, which has not been republished since the original edition, and which is not easily available to readers outside major research centres. I have endeavoured to give footnotes to the dramatis personae of the work, and also to provide the major historical data necessary to understand the political and social setting of the Letter. An introduction outlining this setting and giving the pertinent bibliographical data has been included. This work was edited with reference to the Manuscript of the Letter, in the Mary Hyde collection, and I have included a Table of Variants in which is listed the changes from the manuscript to the text.
Probing the density dependence of symmetry energy via multifragmentation at sub-saturation densities
Creators: name: Kumar, Sanjeev
name: Ma, Y. G.
name: Zhang, G. Q.
name: Zhou, C. L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Symmetry energy for asymmetric nuclear matter at subsaturation densitieswas investigated in the framework of an isospin-dependent quantum molecular dynamics model.Asingle ratio of neutrons and protons is comparedwith the experimental data of Famiano et al. [Phys. Rev. Lett. 97, 052701 (2006)]. We have also performed a comparison for the double ratio with experimental as well as different theoretical results of Boltzmann-Uehling-Uhlenbeck in 1997, Isospin-dependent Boltzmann-Uehling-Uhlenbeck in 2004, Boltzmann-Nordeim-Vlasov, and Improved QuantumMolecular Dynamics models. It is found that the double ratio predicts the softness of symmetry energy, which is a little underestimated in the single ratio. Furthermore, the study of the single ratio is extended for different kinds of fragments, while the double ratio is extended for different neutron-rich isotopes of Sn.
description: 9 pages, 6 figures
Large-scale clustering of buried X-ray AGN: Trends in AGN obscuration and redshift evolution
Creators: name: Viitanen, Akke
name: Allevato, Viola
name: Finoguenov, Alexis
name: Shankar, Francesco
name: Gilli, Roberto
name: Lanzuisi, Giorgio
name: Vito, Fabio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In order to test active galactic nucleus (AGN) unification and evolutionary models, we measured the AGN clustering properties as a function of AGN obscuration defined in terms of hydrogen column density, $N_{\rm H}$. In addition to measuring the clustering of unobscured ($N_{\rm H} < 10^{22}\,{\rm cm}^{-2}$) and moderately obscured ($10^{22} \leq N_{\rm H} < 10^{23.5}$) AGNs, we also targeted highly obscured sources ($N_{\rm H}\geq 10^{23.5}$) up to redshifts of $z=3$. We have compiled one of the largest samples of X-ray-selected AGNs from a total of eight deep XMM/Chandra surveys. We measured the clustering as a function of both AGN obscuration and redshift using the projected two-point correlation function, $w_{\rm p}(r_{\rm p})$. We modeled the large-scale clustering signal, measured the AGN bias, $b(z, N_{\rm H})$, and interpreted it in terms of the typical AGN host dark matter halo, $M_{\rm halo}(z, N_{\rm H}$). We find no significant dependence of AGN clustering on obscuration, suggesting similar typical masses of the hosting halos as a function of $N_{\rm H}$. This result matches expectations of AGN unification models, in which AGN obscuration depends mainly on the viewing angle of the obscuring torus. We measured, for the first time, the clustering of highly obscured AGNs and find that these objects reside in halos with typical mass $\log M_{\rm halo} = 12.98_{-0.22}^{+0.17} [h^{-1} M_\odot]$ ($12.28_{-0.19}^{+0.13}$) at low $z \sim 0.7$ (high $z \sim 1.8$) redshifts. We find that irrespective of obscuration, an increase in AGN bias with redshift is slower than the expectation for a constant halo mass and instead follows the growth rate of halos, known as the passive evolution track. This implies that for those AGNs the clustering is mainly driven by the mass growth rate of the hosting halos and galaxies across cosmic time.
description: 13 pages, 6 figures, accepted for publication in Astronomy & Astrophysics
Legal and ethical implications of applications based on agreement technologies: the case of auction-based road intersections
Creators: name: Santos, José-Antonio
name: Fernández, Alberto
name: Moreno-Rebato, Mar
name: Billhardt, Holger
name: Rodríguez-García, José-A.
name: Ossowski, Sascha
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2.1

description: Agreement Technologies refer to a novel paradigm for the construction of distributed intelligent systems, where autonomous software agents negotiate to reach agreements on behalf of their human users. Smart Cities are a key application domain for Agreement Technologies. While several proofs of concept and prototypes exist, such systems are still far from ready for being deployed in the real-world. In this paper we focus on a novel method for managing elements of smart road infrastructures of the future, namely the case of auction-based road intersections. We show that, even though the key technological elements for such methods are already available, there are multiple non-technical issues that need to be tackled before they can be applied in practice. For this purpose, we analyse legal and ethical implications of auction-based road intersections in the context of international regulations and from the standpoint of the Spanish legislation. From this exercise, we extract a set of required modifications, of both technical and legal nature, which need to be addressed so as to pave the way for the potential real-world deployment of such systems in a future that may not be too far away.
First-Principles Modeling of Pt/LaAlO3/SrTiO3 Capacitors Under an External Bias Potential
Creators: name: Cazorla, Claudio
name: Stengel, Massimiliano
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the electrical properties of Pt/LaAlO3/SrTiO3 capacitors under the action of an external bias potential, using first-principles simulations performed at constrained electric displacement field. A complete set of band diagrams, together with the relevant electrical characteristics (capacitance and built-in fields), are determined as a function of LaAlO3 thickness and the applied potential.We find that the internal field in LaAlO3 monotonically decreases with increasing thickness; hence, the occurrence of spontaneous Zener tunneling is ruled out in this system.We discuss the implications of our results in the light of recent experimental observations on biased LaAlO3/SrTiO3 junctions involving metallic top electrodes.
description: 5 pages, 4 figures
Ukudu: tejiendo mundos. Una mirada sobre la vida y el conocimiento medico de un abuelo Okaina
Creators: name: Fanciotti, Tommaso
Publisher: name: Zenodo
Year: 2020
Subjects: Murui
conocimiento tradicional
río Igaraparaná
Ocaina

description: Esta tesis representa el intento de poner un orden a la larga serie de conversaciones entre José Estrella Candre (Ukudu), ocaina-murui del río Igaraparaná (Colombia) y yo sobre la medicina tradicional de su pueblo. Aunque traten de medicina, el objetivo que persigo en estas páginas no es el de dar cuenta de manera exhaustiva del sistema terapéutico local, sus categorías etiológicas, sus medios diagnósticos, su concepción global de la enfermedad y de la cura —lo que sería fácilmente criticable en un trabajo con base en datos sacado de una sola persona— sino el restituir un punto de vista particular —el de Ukudu— sobre éste mismo. Mi interés es explorar su práctica individual, su manera personal de relacionarse con este conjunto de conocimientos: lo que toma la forma, hoy, de un intento, un esfuerzo de comparar la Biblia con su tradición, de traducir la primera en los términos de la segunda.
Constraining mass transfer and common-envelope physics with post-supernova companion monitoring
Creators: name: Hirai, Ryosuke
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present an analytical model that describes the response of companion stars after being impacted by a supernova in a close binary system. This model captures key properties of the luminosity evolution obtained from 1D stellar evolution calculations fairly well: a high-luminosity plateau phase and a decaying tail phase. It can be used to constrain the pre-supernova binary properties from the observed photometry of the companion star several years after the explosion in a relatively simple manner. The derived binary parameters are useful in constraining the evolutionary scenario for the progenitors and the physics of binary interactions. We apply our model to some known stripped-envelope supernova companions (SN1993J, SN2001ig, SN2006jc, SN2011dh, SN2013ge). Combined with other observational constraints such as the pre-supernova progenitor photometry, we find that SN1993J and SN2011dh likely had relatively massive companions on wide orbits, while SN2006jc may have had a relatively low-mass companion on a tight orbit. This trend suggests that type IIb supernova progenitors evolved from stable mass transfer channels and type Ibc progenitors may have formed from common-envelope channels. The constraints on orbital separation helps us probe the highly uncertain common-envelope physics for massive stars, especially with multiple epochs of companion observations. We also highlight possible limitations of our model due to the assumptions made in the underlying 1D models.
description: 9 pages, 9 figures. Accepted for publication in MNRAS
A Survey of the metazoan parasites of Sebastes alutus Gilbert
Creators: name: Sekerak, Aaron Daniel
Publisher: name: University of Calgary
Year: 1970
Subjects: subject: QL 392 S43 1970
subject: Fishes - Parasites
subject: Copepoda
subject: Worms, Intestinal and parasitic
subject: Perch

description: Bibliography: p. 61-68.
Towards Maximum Spanning Tree Model in Web 3.0 Design and Development for Students using Discriminant Analysis
Creators: name: Padma, S.
name: Seshasaayee, Ananthi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: Web 3.0 is an evolving extension of the web 2.0 scenario. The perceptions regarding web 3.0 is different from person to person . Web 3.0 Architecture supports ubiquitous connectivity, network computing, open identity, intelligent web, distributed databases and intelligent applications. Some of the technologies which lead to the design and development of web 3.0 applications are Artificial intelligence, Automated reasoning, Cognitive architecture, Semantic web . An attempt is made to capture the requirements of Students inline with web 3.0 so as to bridge the gap between the design and development of web 3.0 applications and requirements among Students. Maximum Spanning Tree modeling of the requirements facilitate the identification of key areas and key attributes in the design and development of software products for Students in Web 3.0 using Discriminant analysis. Keywords : Web 3.0, Discriminant analysis, Design and Development, Model, Maximum Spanning Tree 1.
description: ISSN (Online): 1694-0814 http://www.IJCSI.org
Mullite-mullite environmental barrier coatings on silicon nitride by composite sol-gel
Creators: name: Wong, Frankie
Publisher: name: University of British Columbia
Year: 2009

description: Silicon nitride is susceptible to paralinear oxidation in applications exposed to combustion environments, such as glow plugs in direct injection natural gas engines. The oxide layer may become volatile in moist high-temperature environments. To protect Si₃N₄, environmental barrier coatings (EBC) maybe used. Mullite has high corrosion resistance, high temperature strength, and its thermal expansion (CTE=4.5-6 x 10⁻⁶ /°C), is relatively close to that of Si₃N₄ (CTE=3.3 x 10⁻⁶ /°C). However, the CTEs still differ by a factor of 1.4-2, thus it is difficult to produce crack free EBCs >1 µm thick. To address this, it is proposed that a mullite-mullite EBC be applied by composite sol gel. The addition of calcined powder should reduce the overall shrinkage of the sol, making deposition of thicker (1-5µm) coatings possible. Processing methods to produce mullite-mullite EBC by composite sol gel were studied. Sol gel (SG) mullite precursors were prepared by combining silica-precursor sol with AlOOH sol. Commercially available calcined mullite (CM) was dispersed in the sol, with a solid loading of 36%. Gelation of these sols was studied and it was found that using AlOOH sols at a pH of 2.5 gave the best balance of gelation rate and CM sedimentation rate. Mullite sols were prepared and fired at different temperatures and times. It was determined that mullitizatoin of SG samples required 20min at 1300°C, however, CM addition allowed a similar extent of mullitization at 1250°C. It is hypothesized that the CM acted as seeds, shortening the nucleation step during mullite formation. Calcined samples had a density of 3.01g/cm³, with a total porosity of 9.4%. Glow plugs were dip coated. Final dipping parameters were sol viscosity of 40cps and withdrawal speed of 0.1mm/s. Calcined coatings with CM were relatively crack free with thicknesses of ~3μm. A coated glow plug was tested on an electric rig for effectiveness against oxidation. After 100hrs at 1300°C, the corrosion products layer on the coated glow plug was about one fourth as compared to the as received glow plugs. In conclusion, the composite sol-gel mullite EBC appears to provide significant oxidation protection to the silicon nitride glow plugs.
Internal calibration of LAMOST and Gaia DR3 GSP-Spec stellar abundances
Creators: name: Niu, Zexi
name: Yuan, Haibo
name: Liu, Jifeng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Stellar chemical abundances are crucial and fundamental in astrophysics. However, they could suffer from substantial systematic errors according to several investigations but still lack calibrations in bulk. By using Gaia wide binaries, we find the temperature-dependent bias between the two binary components for [Fe/H] and [alpha/Fe] measurements from the LAMOST low-resolution spectra and Gaia RVS spectra. At Teff=4000 K, the LAMOST [Fe/H] is significantly underestimated by approximately 0.4 dex, compared with its typical uncertainty of 0.1 dex. Its [alpha/Fe] is overestimated by about 0.2 dex. For Gaia, the underestimation of [M/H] and overestimation of [alpha/Fe] becomes pronounced near 7000 K with smaller magnitudes. We perform an internal calibration by minimizing the differences between binary components and provide the correction curves. After corrections, the standard deviations of the residuals compared to the PASTEL catalog decrease from about 0.045/0.1 to 0.02/0.043 for LAMOST and Gaia, respectively. The chemical homogeneity of the open cluster M 44 is also improved by a factor of two. We stress that the underestimation of [Fe/H] could lead to an overestimation of binary fractions when selecting binary stars by the excess of luminosity. The method of this work could be applied to other data-sets in the future. Our results will benefit statistic studies that use LAMOST and Gaia samples with a wide temperature range.
description: 13 pages, 7 figure, ApJ accepted, comments are welcome