cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Planetary Nebulae with Ultra-Violet Imaging Telescope (UVIT): Far Ultra-violet halo around the Bow Tie nebula (NGC 40)
Creators: name: Rao, N. Kameswara
name: Sutaria, F.
name: Murthy, J.
name: Krishna, S.
name: Mohan, R.
name: Ray, A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. NGC 40 is a planetary nebula with diffuse X-ray emission, suggesting an interaction of the high speed wind from WC8 central star (CS) with the nebula. It shows strong Civ 1550 Å emission that cannot be explained by thermal processes alone. We present here the first map of this nebula in C IV emission, using broad band filters on the UVIT. Aims. To map the hot C IV emitting gas and its correspondence with soft X-ray (0.3-8 keV) emitting regions, in order to study the shock interaction with the nebula and the ISM. This also illustrates the potential of UVIT for nebular studies. Methods. Morphological study of images of the nebula obtained at an angular resolution of about 1.3" in four UVIT filter bands that include C IV 1550 Å and C II] 2326 Å lines and UV continuum. Comparisons with X-ray, optical, and IR images from literature. Results. The C II] 2326 Å images show the core of the nebula with two lobes on either side of CS similar to [N II]. The C IV emission in the core shows similar morphology and extant as that of diffuse X-ray emission concentrated in nebular condensations. A surprising UVIT discovery is the presence of a large faint FUV halo in FUV Filter with λeff of 1608 Å. The UV halo is not present in any other UV filter. FUV halo is most likely due to UV fluorescence emission from the Lyman bands of H2 molecules. Unlike the optical and IR halo, FUV halo trails predominantly towards south-east side of the nebular core, opposite to the CS's proper motion direction. Conclusions. Morphological similarity of C IV 1550 Å and X-ray emission in the core suggests that it results mostly from interaction of strong CS wind with the nebula. The FUV halo in NGC 40 highlights the existence of H2 molecules extensively in the regions even beyond the optical and IR halos.
description: 4 pages, 5 figures, accepted for publication as a letter in Astronomy & Astrophysics
Coexisting synchronous and asynchronous states in locally coupled array of oscillators by partial self-feedback control
Creators: name: Bera, Bidesh K.
name: Ghosh, Dibakar
name: Parmananda, Punit
name: Osipov, G. V.
name: Dana, Syamal K.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We report the emergence of coexisting synchronous and asynchronous subpopulations of oscillators in one dimensional arrays of identical oscillators by applying a self-feedback control. When a self-feedback is applied to a subpopulation of the array, similar to chimera states, it splits into two/more sub-subpopulations coexisting in coherent and incoherent states for a range of self-feedback strength. By tuning the coupling between the nearest neighbors and the amount of self-feedback in the perturbed subpopulation, the size of the coherent and the incoherent sub-subpopulations in the array can be controlled, although the exact size of them is unpredictable. We present numerical evidence using the Landau-Stuart (LS) system and the Kuramoto-Sakaguchi (KS) phase model.
description: 13 pages, 13 figures, accepted for publication in CHAOS (July 2017)
Universality in the Random Walk Structure Function of Luminous Quasi-Stellar Objects
Creators: name: Tang, Ji-Jia
name: Wolf, Christian
name: Tonry, John
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Rapidly growing black holes are surrounded by accretion disks that make them the brightest objects in the Universe. Their brightness is known to be variable, but the causes of this are not implied by simple disk models and still debated. Due to the small size of accretion disks and their great distance, there are no resolved images addressing the puzzle. In this work, we study the dependence of their variability on luminosity, wavelength and orbital/thermal timescale. We use over 5,000 of the most luminous such objects with light curves of almost nightly cadence from $>5$ years of observations by the NASA/ATLAS project, which provides 2 billion magnitude pairs for a structure function analysis. When time is expressed in units of orbital or thermal time scale in thin-disk models, we find a universal structure function, independent of luminosity and wavelength, supporting the model of magneto-rotational instabilities as a main cause. Over a $>1$~dex range in time, the fractional variability amplitude follows $\log (A/A_0) \simeq 1/2 \times \log (Δt/t_{\rm th})$. Deviations from the universality may hold clues on the structure and orientation of disks.
description: 21 pages, 5 figures
The GZK Feature in our Neighborhood of the Universe
Creators: name: Blanton, Michael
name: Blasi, Pasquale
name: Olinto, Angela V.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We calculate numerically the spectrum of ultra-high energy cosmic rays on Earth assuming that their sources are distributed in space like the observed galaxies. We use the CfA2 and the PSCz galaxy redshift surveys to model the local galaxy distribution, properly taking into account the galaxy selection functions for each survey. When the survey selection effects are included, we find that the local overdensity is only a factor of two, an order of magnitude less than used in some earlier studies. An overdensity of two is not enough to bridge the gap between the predicted number of events above $10^{20}$ eV and the measured flux at these highest energies. This conclusion is particularly strong for soft injection spectra ($\propto E^{-3}$) where the observed number of events is 6 $σ$ higher than the expected one. However, if the injection spectrum is hard ($\propto E^{-2}$), the small local overdensity helps bring the present data within 2$σ$ of the low number of events predicted above $10^{20}$ eV. In this case, the Greisen-Zatzepin-Kuzmin cutoff is not a {\it cutoff} but rather a {\it feature} in the cosmic ray spectrum.
description: 17 pages, 8 figures
Aeronomy of Mars: An observational study of the dynamic martian upper atmosphere
Creators: name: Siddle, Alexander
Publisher: name: Imperial College London
Year: 2020

description: The Martian upper atmosphere is highly dynamic over both short and long temporal and spatial scales. Our understanding of this region primarily stems from a wealth of data gathered both in-situ and remotely from spacecraft orbiting the Red Planet. In 2014 NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft began orbiting Mars with the primary objective to probe and characterise the upper atmosphere using composition data. Data from the Neutral Gas and Ion Mass Spectrometer (NGIMS) on board MAVEN has been utilised throughout this thesis. Daily, monthly and seasonal density and temperature variations have been explored. An apparent day-night asymmetry is observed in temperature with the dayside typically 50-100 K warmer due to solar-EUV heating. Seasonal analysis has found densities to be significantly enhanced around perihelion compared to other times throughout a Martian year. Perturbations in density and temperature profiles have been interpreted as vertically propagating gravity waves. Diurnal and seasonal variations of gravity wave characteristics have been examined with enhanced activity on the nightside. Fully understanding these features is required if the complexities of the upper atmosphere are to be fully grasped. The Martian science community was fortunate to have a plethora of spacecraft at Mars during the June 2018 global dust storm. This thesis has examined the response of the upper atmosphere to such an important and rare event. A notable expansion of the atmosphere is observed whereby the upper atmosphere is raised by several kilometres, due to heating in the lower atmosphere. It is hoped that results can inform efforts made to model and predict the effects of a dust storm. For the first time, gravity waves at Mars during a global dust storm have been studied. Atmospheric perturbations are found to be significantly enhanced during the dust storm event. During 2017/2018, ESA's Trace Gas Orbiter (TGO) undertook its aerobraking phase to circularise itself into its science orbit. During this period, density data were able to be retrieved in the lower thermosphere from accelerometer measurements. The retrieval process was not part of this thesis; however, these data are used for the first time. Standalone analyses are performed with these data but are also combined with results from MAVEN owing to the two spacecraft sampling similar regions concurrently. This overlapping period is exploited, and densities are hydrostatically connected to understand the entire thermosphere structure. By combining wave data, it has been inferred that shorter wavelengths are saturated within the thermosphere, whereas larger wavelengths continue to grow with height.
Flavonoids from Lemon & Tea as Effective Inhibitors against Carcinogenesis
Creators: name: HK Garg
name: A. Choudhary
name: Shrivatava, Ashish
Publisher: name: figshare
Year: 2018
Subjects: Biotechnology

description: Cancer is an anomalous proliferation of cells that manifests as pain, deformity and damage to the entire physiological device of the patient. Cancer can occur at any time, at any age and in any part of the body due to an intricate, partially understood chemistry between genes and the environmental factors. It continues to represent the largest cause of mortality claiming ≥3500 lives per million per annum around the world. A number of chemo-preventive agents are being used to treat cancer; ˃1500 anticancer drugs are under development and more than 500 drugs are under clinical trials. However, a safe and effective drug, against the deadly disease, is still miles away from our reach.Medicinal plants serve as natural therapeutic agent against cancer. They stimulate host resistance against septicity by re-stabilizing body equilibrium and acclimatizing the body tissues. Camellia sinensis (Tea) is one of the most prevalent beverages in the world. Tea reduces the probability of cancers in ovary, oral cavity, colon, stomach and prostrate owing to the presence of catechins (flavonoids). Catechin work as a strong antioxidant, impedes cell proliferation and modulates carcinogenic metabolism. Similarly, Citrus limona (lemon fruit) holds flavonoid, limonoid, nobiletin and tangeretin. The flavonoid, nobiletin and tangeretin are strong inhibitors of lump progression and trigger the detoxifying P450 enzyme system.Antioxidants, viz. vitamins (A,C,E), carotene, enzymes (superoxidase dismutase, catalase and glutathion peroxidase), minerals (Cu, Mn, Se and Zn), polysaccharides, polyphenols, flavonoids (quercetin, anthocyanins, catechins, flavones, flavonones and isoflavones), lignins, xanthones, etc., thus play a substantial role in inhibition of carcinogenesis. Efforts are underway to combine the bioactive components of these plants to deduce their synergistic effects.
Influence of simultaneous doping of Sb & Pb on phase formation, superconducting and microstructural characteristics of HgBa2Ca2Cu3O8+δ
Creators: name: Giri, Rajiv
name: Tiwari, R. S.
name: Srivastava, O. N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report systematic studies of structural, microstructural and transport properties of (Hg_0.80 Sb_0.2-x Pb_x)Ba_2 Ca_2 Cu_3O_8+δ(where x = 0.0, 0.05, 0.1, 0.15, 0.2) compounds. Bulk polycrystalline samples have been prepared by two-step solid-state reaction route at ambient pressure. It has been observed that simultaneous substitution of Sb and Pb at Hg site in oxygen deficient HgO_δlayer of HgBa2Ca2Cu3O8+δcuprate high-Tc superconductor leads to the formation of Hg-1223 as the dominant phase. Microstructural investigations of the as grown samples employing scanning electron microscopy reveal single crystal like large grains embodying spiral like features. Superconducting properties particularly transport current density (Jct) have been found to be sensitive to these microstructural features. As for example (Hg0.80Sb0.05Pb0.15)Ba2Ca2Cu3O8+δcompound which exhibits single crystal like large grains (~ 50 micrometer) and appears to result through spiral growth mechanism, shows highest Jct (~ 1.85 x 103 A/cm2) at 77K. A possible mechanism for the generation of spiral like features and correlation between microstructural features and superconducting properties have been put forward.
description: 16 pages, 6 figures. Accepted in Physica C
FedDebug: Systematic Debugging for Federated Learning Applications
Creators: name: Gill, Waris
name: Anwar, Ali
name: Gulzar, Muhammad Ali
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In Federated Learning (FL), clients independently train local models and share them with a central aggregator to build a global model. Impermissibility to access clients' data and collaborative training make FL appealing for applications with data-privacy concerns, such as medical imaging. However, these FL characteristics pose unprecedented challenges for debugging. When a global model's performance deteriorates, identifying the responsible rounds and clients is a major pain point. Developers resort to trial-and-error debugging with subsets of clients, hoping to increase the global model's accuracy or let future FL rounds retune the model, which are time-consuming and costly.
 We design a systematic fault localization framework, FedDebug, that advances the FL debugging on two novel fronts. First, FedDebug enables interactive debugging of realtime collaborative training in FL by leveraging record and replay techniques to construct a simulation that mirrors live FL. FedDebug's breakpoint can help inspect an FL state (round, client, and global model) and move between rounds and clients' models seamlessly, enabling a fine-grained step-by-step inspection. Second, FedDebug automatically identifies the client(s) responsible for lowering the global model's performance without any testing data and labels--both are essential for existing debugging techniques. FedDebug's strengths come from adapting differential testing in conjunction with neuron activations to determine the client(s) deviating from normal behavior. FedDebug achieves 100% accuracy in finding a single faulty client and 90.3% accuracy in finding multiple faulty clients. FedDebug's interactive debugging incurs 1.2% overhead during training, while it localizes a faulty client in only 2.1% of a round's training time.
description: Published at ICSE 2023. Link https://ieeexplore.ieee.org/document/10172839
Modeling and control of power electronic converters in power systems
Creators: name: Li, Yitong
Publisher: name: Imperial College London
Year: 2020

description: Power grids are undergoing a dominant transformation due to the increasing number of power electronic devices installed in generation, transmission, distribution, and demand, etc. Compared with traditional power systems dominated by synchronous generators, the growth of power electronics induces new behaviour of power network dynamics, physical constraints, running costs, etc, which urgently calls for a new framework of modeling, control, and stability analysis. This thesis first focuses on the impedance method for modeling ac-dc power converters in power systems, designing the controllers, and analyzing the stability. A tool called Impedance circuit model is proposed to intuitively derive the impedance model of a grid-connected power converter. Compared with the conventional all-in-one impedance model, the proposed tool maps the control parameters explicitly to discrete virtual impedances in an impedance circuit and meanwhile captures the multi-control-loop interaction and coupling of a converter. Another tool named frame-dynamics-embedding impedance model is also proposed to systematically embed the frame dynamics (grid synchronization) of a power converter into its impedance model. This tool also enables the impedance model of power networks by making the reference frames of different devices consistent. The frame-transformation impedance model is finally proposed to reveal the relationship of impedance models in synchronous dq and stationary alpha/beta frames. These proposed tools make up an impedance modeling framework, which are applied to the most fundamental and widely-used converters in power systems [i.e., the voltage-source inverters (VSIs)] as examples in this thesis. Both simulation and experiment tests are conducted to validate the corresponding theoretical analysis. VSIs are the widely-used ac-dc converters which integrate sources or loads to the utility ac grids. But with the increasing use of dc in the ac-dominated power systems, an ac-dc converter is also required to perform as an interlinking converter, which links dc networks and the utility ac grids. It forms hybrid ac-dc grids and brings more integration and control problems. Hence, in addition to conventional VSIs, this thesis also explores novel topologies and control algorithms of ac-dc converters with advanced features to connect dc networks to ac grids. They are able to improve the grid integration and enhance the grid reliability (e.g., bidirectional voltage stiffness transfer, bipolar-dc-imbalance handling, dc-side fault blocking, high-frequency galvanic isolation, etc). Down-scaled prototypes for them are built and tested to validate the corresponding theoretical analysis and the proposed control algorithms. It is expected that the work in this thesis can inspire not only the fundamental framework of modeling and control analysis, but also the advanced development of converter topologies and control methods of power converters in power system applications.
Constraints on the hadronic spectrum from Lattice QCD
Creators: name: Parotto, Paolo
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The spectrum of hadronic resonances continually receives updates from the Particle Data Group, which lists every state with a status representing how established the state is. Moreover, the existence of additional states is predicted by relativistic quark models. It has been suggested that further states might need to be included in the hadronic spectrum in order to improve the agreement between the hadron resonance gas model predictions and lattice QCD data. Such an inclusion would also affect the results of many areas of heavy-ion collision physics that make use of hadronic degrees of freedom, such as hydrodynamical simulations afterburners. However, for some selected observables, the inclusion of further states worsens the agreement with the lattice results. We propose new observables, sensitive to the spectrum content divided by quantum numbers, which allow us to gauge the contribution of additional states. The comparison of Lattice QCD results and predictions from the Hadron Resonance Gas model for these observables, helps to clarify the situation and determine how many, and which new states are needed.
description: 5 pages, 4 figures, contribution to the proceedings of FAIRness 2017 conference in Sitges, Spain
title: 01_1022
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
A comparison of in-person and telehealth treatment modalities using the speechvive device
Creators: name: Covert, Renee M
Publisher: name: Purdue University Graduate School
Year: 2025
Subjects: classificationCode: 420110
subject: Speech pathology

description: Telehealth is an increasingly popular treatment option for people with Parkinson disease (PD). The SpeechVive device is a wearable device that uses the Lombard effect to help patients speak more loudly, slowly, and clearly. This study sought to examine the effectiveness of the device to improve communication in people with PD, delivered in-person and over a telehealth modality using an implementation science design. Sixty-six (66) people with PD were enrolled for twelve (12) weeks with thirty-four (34) choosing the in-person group and thirty-two (32) in the telehealth group. Participants were assessed pre-, mid-, and post-treatment. Participants produced continuous speech samples with and without the device at each timepoint. Sound pressure level (SPL), utterance length, pause frequency, and total pause duration were measured. Psychosocial questionnaires were administered to evaluate the effects of treatment on depression, self-efficacy, and participation. The in-person group increased SPL when wearing the device while the telehealth group did not. Both groups paused less often while wearing the device. Utterance length increased post-treatment for the telehealth group, but not for the in-person group. An increase in communication participation ratings in the telehealth group, but not the in-person group, was the only significant change in the psychosocial metrics. The in-person group showed similar treatment effects as previous studies. The device had less effect on intensity in the telehealth group but improved comminicative participation ratings more, as compared to in-person. One limitation was data loss due to recording issues that impacted the telehealth group more than the in-person group.
title: ADCO, Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome IV, Cart. 188 (11 H 73), f. 0155v
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire

description: Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome IV, Archives départementales de la Côte-d'Or, Cart. 188 (11 H 73), f. 0155v, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome IV, Archives départementales de la Côte-d'Or, Cart. 188 (11 H 73), f. 0155v, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
Presenting the idea behind SciDir - A scientific software distribution repository for bringing reproducible software containers securely to HPCs in Australia
Creators: name: Bollmann, Steffen
Publisher: name: Zenodo
Year: 2023

description: Situation: The analysis of scientific data requires specialised scientific software and processing pipelines. However, researchers often spend inordinate amounts of time compiling the requisite software and troubleshooting dependency conflicts. Furthermore, research results are often difficult to reproduce due to system dependency differences, even when given the original data and analysis code.

Task: In this project, we aim to develop an open-source, community-oriented project that addresses the issues of accessibility and reproducibility of scientific software. In this session, we would like to present the idea, receive feedback from the community and plan how we can work together toward an implementation.

Action: We are proposing to build on previous work around containers on CVMFS in the Neurodesk project and BioCommons to develop a secure scientific software distribution system. The proposed platform consists of a software container build system, where the scientific community proposes software applications and reference datasets. These artefacts are built, packaged in software containers, and scanned for vulnerabilities before being uploaded to a container registry. The software container metadata is stored in a database for fast and transparent tool discovery. A flexible distribution mechanism will enable this software to be used on various computing endpoints.

Result: Our approach would accelerate progress in all scientific disciplines dealing with the processing of data on high-performance computers. It would enable the flexible processing of scientific data across different computing platforms and the portability of analyses between them.
Thermodynamic correlation inequality
Creators: name: Hasegawa, Yoshihiko
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Trade-off relations place fundamental limits on the operations that physical systems can perform. This Letter presents a trade-off relation that bounds the correlation function, which measures the relationship between a system's current and future states, in Markov processes. The obtained bound, referred to as the thermodynamic correlation inequality, states that the change in the correlation function has an upper bound comprising the dynamical activity, a thermodynamic measure of the activity of a Markov process. Moreover, by applying the obtained relation to the linear response function, it is demonstrated that the effect of perturbation can be bounded from above by the dynamical activity.
description: 7 pages, 3 figure; 10 pages of supplemental material with 1 figure
Abundance analyses of the new R Coronae Borealis stars: ASAS-RCB-8 and ASAS-RCB-10
Creators: name: Hema, B. P.
name: Pandey, Gajendra
name: Kamath, Devika
name: Rao, N. Kameswara
name: Lambert, David
name: Woolf, Vincent M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Abundance analyses of the two newly discovered R Coronae Borealis (RCB) stars ASAS-RCB-8 and ASAS-RCB-10 were conducted using high-resolution optical spectra and model atmospheres. Their chemical compositions place the pair among the majority class of RCBs. ASAS-RCB-10 is one of the most N-poor majority RCBs with an above average O abundance. Relative to ASAS-RCB-10, ASAS-RCB-8 is H poor by 1.6 dex, O-poor by 0.7 dex but N-rich by 0.8 dex suggesting a higher contamination by CNO-cycled material.
description: Accepted for publication in PASP
title: Semi-automated regional scale debris-flow and debris-flood susceptibility mapping based on digital elevation model metrics and Flow-R software
Creators: name: Sturzenegger, Matthieu
name: Holm, Kris
name: Lau, Carie-Ann
name: Jakob, Matthias
Publisher: name: Mountain Scholar
Year: 2019
Subjects: debris flow
debris flood
susceptibility mapping
digital elevation model
Flow-R
risk assessment

description: Regional scale debris-flow or debris-flood susceptibility mapping based on terrain analysis is limited by a high degree of effort and the availability of surface evidence for past events, which may be obfuscated by development or obscured by repeat erosion or debris inundation. This paper presents a semi-automated methodology for debris-flow and debris-flood susceptibility mapping at regional scale based on a combination of digital elevation model (DEM) metrics to identify potential source zones, and flow propagation simulations using the Flow-R code. The DEM metrics allow identification and preliminary, process-based classification of streams prone to debris flow and debris flood, respectively. Flow-R simulations are based on a combination of spreading and runout algorithms considering DEM topography and empirical runout parameters. The methodology was first tested in a region of the Canadian Rocky Mountains, where detailed debris-flood hazard assessments had been previously undertaken based on both field mapping and numerical modeling. It was then applied over two regions, with 22,000 km2 and 55,000 km2 areas, respectively, in central British Columbia, Canada. One important advantage of the presented methodology is the limited amount of data required to generate a preliminary susceptibility map over a large region. Once incorporated in a risk assessment framework, this map can be used to prioritize more detailed assessments. The methodology was also applied at a higher level of detail to an approximately 30 km long roadway corridor in Southwestern British Columbia. At the assessment level of this project, the methodology allowed generation of a susceptibility map which considered the cumulative contribution of several potential source zones within each debris-flow and debris-flood watershed. This map allowed risk-based prioritization and supported debris-flow risk reduction decision making.
title: Transcription d'un entretien auprès d’une femme âgée de 34 ans, mère de quatre enfants dans le sud du Maroc
Creators: name: Gélard, Marie-Luce
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2017

description: L’enquête débute par le récit de l'informatrice sur la première fois où elle a donné le sein. L’informatrice rapporte qu’elle n’avait pas les tétons assez développés. L’informatrice raconte la durée de la période d’allaitement pour ses trois enfants. L’enquêtrice pose ensuite des questions sur la séparation de l’enfant de la mère à la naissance. L’informatrice raconte que l’enfant est mis à coté de la mère après la naissance. Elle explique qu’une fois les premiers soins de l’enfant achevés, on donne à l’enfant du jus de datte, du beurre frais ou encore de l’huile. L’enquêtrice aborde ensuite les questions sur le colostrum. L’informatrice explique que le colostrum ressemble à de l’eau avant de se transformer en lait. Elle précise également que le colostrum est plus nourrissant que le lait car il est plus épais. Elle ajoute qu’il dure environ sept jours mais elle ignore comment il est produit. L’informatrice explique que les préceptes coraniques conseillent l’allaitement sur une durée de deux ans mais elle n’est pas certaine de son propos. L’informatrice évoque ensuite la manière dont elle donne les tétées et explique que des enfants peuvent devenir frères de lait en tétant le colostrum. L’informatrice énumère les aliments et les préparations qu’elle a consommés pour favoriser la montée de lait. Elle décrit également les différentes étapes des premiers soins qui sont donnés à l’enfant. L’informatrice explique ensuite que la mère ne peut pas avoir de rapports sexuels avec son mari durant quarante jours après la naissance et pendant la période d’allaitement. A la fin de l’enquête, l'informatrice explique que le colostrum de chèvre ne peut pas être donné aux enfants, en revanche, on peut leur donner du lait de chèvre.
Pair production of heavy quarkonia in the color evaporation model
Creators: name: Chernyshev, Alexey
name: Saleev, Vladimir
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the article, we study pair production of heavy quarkonia $(J/ψJ/ψ, ΥΥ, ΥJ/ψ)$ in the improved color evaporation model via the parton Reggeization approach. The last one is based on high-energy factorization of hard processes in multi-Regge kinematics, the Kimber-Martin-Ryskin-Watt model for unintegrated parton distribution functions, and the Lipatov effective field theory of Reggezied gluons and quarks. We compare contributions from the single and double parton scattering mechanisms in the pair production of heavy quarkonia. The numerical calculations are performed with the Monte-Carlo event generator KaTie.
description: 13 pages, 6 figures, Talk at the 6th International Conference on Particle Physics and Astrophysics, 29 November, 2022, Moscow
Effect of Stress on Glucose Metabolism
Creators: name: HK Garg
Publisher: name: figshare
Year: 2018
Subjects: Biotechnology

description: Diabetes mellitus is a set of disorders that share common insufficiency in the regulation of carbohydrate metabolism. The term diabetes mellitus refers to the sweet tang urine of patients with the disease, a symptom first described by Areteus over 2000 years ago. Stress has long been suspected as a prime cause of metabolic disarray. Stress impairs glucose metabolism by discharging a host of ‘counter-regulatory’ hormones that result in declined insulin activity and elevated blood glucose levels.Stress has an energy mobilizing effect on a healthy organism. However, in patients suffering from diabetes, due to relative or absolute lack of insulin, stress provoked high blood glucose cannot be adequately metabolized. Thus, stress is a potential contributor to chronic hyperglycemia in diabetes. Bjorntorp (1991) suggested that this mechanism may lead to both central obesity and a predisposition to diabetes. Stress initiated discharge of growth hormone and beta-endorphin can also reduce glucose uptake, restrain insulin secretion and raise glucose levels. There are vagal afferents form the liver to the central nervous system and brain receptors for numerous peptide hormones originally found in gut. The adaptive benefit of the mechanism of stress-induced energy mobilization in healthy individuals is evident, but in diabetic individuals, where glucose metabolism is on stake, the mechanism may be complicated.
Existence of unimodular element in a projective module over symbolic Rees algebras
Creators: name: Bhaumik, Chandan
name: Sarwar, Husney Parvez
Publisher: name: arXiv
Year: 2023
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: Let $A$ be a symbolic (or an extended symbolic) Rees algebra (need not be Noetherian) of dimension $d$. Let $P$ be a finitely generated projective $A$-module of rank $\geq$ $d$. Then P has a unimodular element. This improves the classical result of Serre for the mentioned class of algebras.
NeSI's Flexible HPC – A programmable infrastructure for advanced research solutions
Creators: name: Huh, Jun
Publisher: name: Zenodo
Year: 2023

description: Background

In 2021 the New Zealand eScience Infrastructure (NeSI) procured and integrated a new high-performance community cloud platform called Flexible HPC. This talk will cover some of the motivations and early use-cases for the new platform, alongside a view of the value proposition, key partnerships, and patterns of use.

The evolving eResearch landscape in Aotearoa New Zealand has highlighted needs for diverse solutions. The Flexible HPC platform responds by supporting multiple research sector customer segments and tenancy models, enabling a wider variety of use cases beyond a traditional HPC service offering. This includes contemporary on-demand access to shared services alongside research institution' or group' private eResearch platforms with tight institutional integration and joint service delivery.

Actions

Past two years, NeSI has collaborated on a variety of lead projects to co-design and deliver advanced eResearch solutions hosted on Flexible HPC, including support for M?ori data sovereignty, enabling tight institutional integration, and uniting devops approaches with research software engineering on research discipline or community specific platforms.

NeSI is taking a deliberate growth approach to evolving Flexible HPC supported by a catalogue of solution blueprints and patterns as new sector needs are identified and opportunities for novel collaboration and co-design arise.

Results

Five early use cases will be examined across three tenancy models to highlight key learnings in this presentation. It is envisaged that NeSI's FlexiHPC will provide the sector with a programmable platform for collaboration around science data and support a scalable approach to mid-tier HPC with national expertise complementing localised integration.
The Gaia-ESO Survey: open clusters in Gaia-DR1 - a way forward to stellar age calibration
Creators: name: Randich, S.
name: Tognelli, E.
name: Jackson, R.
name: Jeffries, R. D.
name: Degl'Innocenti, S.
name: Pancino, E.
name: Fiorentin, P. Re
name: Spagna, A.
name: Sacco, G.
name: Bragaglia, A.
name: Magrini, L.
name: Moroni, P. G. Prada
name: Alfaro, E.
name: Franciosini, E.
name: Morbidelli, L.
name: Roccatagliata, V.
name: Bouy, H.
name: Bravi, L.
name: Jiménez-Esteban, F. M.
name: Jordi, C.
name: Zari, E.
name: Tautvaišiene, G.
name: Drazdauskas, A.
name: Mikolaitis, S.
name: Gilmore, G.
name: Feltzing, S.
name: Vallenari, A.
name: Bensby, T.
name: Koposov, S.
name: Korn, A.
name: Lanzafame, A.
name: Smiljanic, R.
name: Bayo, A.
name: Carraro, G.
name: Costado, M. T.
name: Heiter, U.
name: Hourihane, A.
name: Jofré, P.
name: Lewis, J.
name: Monaco, L.
name: Prisinzano, L.
name: Sbordone, L.
name: Sousa, S. G.
name: Worley, C. C.
name: Zaggia, S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We describe the methodologies that, taking advantage of Gaia-DR1 and the Gaia-ESO Survey data, enable the comparison of observed open star cluster sequences with stellar evolutionary models. The final, long-term goal is the exploitation of open clusters as age calibrators. We perform a homogeneous analysis of eight open clusters using the Gaia-DR1 TGAS catalogue for bright members, and information from the Gaia-ESO Survey for fainter stars. Cluster membership probabilities for the Gaia-ESO Survey targets are derived based on several spectroscopic tracers. The Gaia-ESO Survey also provides the cluster chemical composition. We obtain cluster parallaxes using two methods. The first one relies on the astrometric selection of a sample of bona fide members, while the other one fits the parallax distribution of a larger sample of TGAS sources. Ages and reddening values are recovered through a Bayesian analysis using the 2MASS magnitudes and three sets of standard models. Lithium depletion boundary (LDB) ages are also determined using literature observations and the same models employed for the Bayesian analysis. For all but one cluster, parallaxes derived by us agree with those presented in Gaia Collaboration et al. (2017), while a discrepancy is found for NGC 2516; we provide evidence supporting our own determination. Inferred cluster ages are robust against models and are generally consistent with literature values. The systematic parallax errors inherent in the Gaia DR1 data presently limit the precision of our results. Nevertheless, we have been able to place these eight clusters onto the same age scale for the first time, with good agreement between isochronal and LDB ages where there is overlap. Our approach appears promising and demonstrates the potential of combining Gaia and ground-based spectroscopic datasets.
description: Accepted for publication by A&A. 22 pages main text plus 8 pages appendices, 12 figures main text, 7 figures appendices
Effect of mesonic off-shell correlations in the PNJL equation of state
Creators: name: Maslov, Konstantin
name: Blaschke, David
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the meson contribution to the equation of state of the 2-flavor PNJL model, including the full momentum dependence of the meson polarization loops. Within the Beth-Uhlenbeck approach, we demonstrate that the contribution from the quark-antiquark continuum excitations in the spacelike region $ω^2 - q^2 < 0$, i.e. the Landau damping, leads to an increase of the pressure for temperatures $\gtrsim 0.8\,T_c^χ$ and a significant meson momentum cut-off dependence in the mesonic pressure and the QCD trace anomaly. We investigate the dependence of the results on the choice of the Polyakov-loop potential parameter $T_0$. From the dependence of the mesonic pressure on the current quark mass, by means of the Feynman-Hellmann theorem, we evaluate the contribution of the pion quasiparticle gas and Landau damping to the chiral condensate.
description: 13 pages, 8 figures
Characterization of Marcellus Shale Fracture Properties through Size Effect Tests and Computations
Creators: name: Li, Weixin
name: Jin, Zhefei
name: Cusatis, Gianluca
Publisher: name: arXiv
Year: 2017
Subjects: subject: Geophysics (physics.geo-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Mechanical characterization of shale-like rocks requires understanding the scaling of the measured properties to enable the extrapolation from small scale laboratory tests to field study. In this paper, the size effect of Marcellus shale was analyzed, and the fracture properties were obtained through size effect tests. A number of fracture tests were conducted on Three-Point-Bending (TPB) specimens with increasing size. Test results show that the nominal strength decreases with increasing specimen size, and can be fitted well by Bazant's Size Effect Law (SEL). It is shown that SEL accounts for the effects of both specimen size and geometry, allowing an accurate identification of the initial fracture energy of the material, Gf, and the effective Fracture Process Zone (FPZ) length, cf. The obtained fracture properties were verified by the numerical simulations of the investigated specimens using standard Finite Element technique with cohesive model. Significant anisotropy was observed in the fracture properties determined in three principal notch orientations: arrester, divider, and short-transverse. The size effect of the measured structural strength and apparent fracture toughness was discussed. Neither strength-based criterion which neglects size effect, nor classic LEFM which does not account for the finiteness of the FPZ can predict the reported size effect data, and nonlinear fracture mechanics of the quasibrittle type is instead applicable.
Transitions between topologically non-trivial configurations
Creators: name: Gani, Vakhid A.
name: Kirillov, Alexander A.
name: Rubin, Sergey G.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study formation and evolution of solitons within a model with two real scalar fields with the potential having a saddle point. The set of these configurations can be split into disjoint equivalence classes. We give a simple expression for the winding number of an arbitrary closed loop in the field space and discuss the evolution scenarios that change the winding number. These non-trivial field configurations lead to formation of the domain walls in the three-dimensional physical space.
description: 5 pages, 2 figures; Proceedings of the 3rd International Conference on Particle Physics and Astrophysics, Moscow, 2-5 October 2017
Radiative Particle-in-Cell Simulations of Turbulent Comptonization in Magnetized Black-Hole Coronae
Creators: name: Groselj, Daniel
name: Hakobyan, Hayk
name: Beloborodov, Andrei M.
name: Sironi, Lorenzo
name: Philippov, Alexander
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We report results from the first radiative particle-in-cell simulations of strong Alfvenic turbulence in plasmas of moderate optical depth. The simulations are performed in a local 3D periodic box and self-consistently follow the evolution of radiation as it interacts with a turbulent electron-positron plasma via Compton scattering. We focus on the conditions expected in magnetized coronae of accreting black holes and obtain an emission spectrum consistent with the observed hard state of Cyg X-1. Most of the turbulence power is transferred directly to the photons via bulk Comptonization, shaping the peak of the emission around 100 keV. The rest is released into nonthermal particles, which generate the MeV spectral tail. The method presented here shows promising potential for ab initio modeling of various astrophysical sources and opens a window into a new regime of kinetic plasma turbulence.
description: Accepted for publication in Physical Review Letters
On the stability of renormalizable expansions in three-dimensional gravity
Creators: name: Mizoguchi, Shun'ya
name: Yamamoto, Hisashi
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Preliminary investigations are made for the stability of the $1/N$ expansion in three-dimensional gravity coupled to various matter fields, which are power-counting renormalizable. For unitary matters, a tachyonic pole appears in the spin-2 part of the leading graviton propagator, which implies the unstable flat space-time, unless the higher-derivative terms are introduced. As another possibility to avoid this spin-2 tachyon, we propose Einstein gravity coupled to non-unitary matters. It turns out that a tachyon appears in the spin-0 or -1 part for any linear gauges in this case, but it can be removed if non-minimally coupled scalars are included. We suggest an interesting model which may be stable and possess an ultraviolet fixed point.
description: 32 pages. (A further discussion to avoid tachyons is included. To be Published in Physical Review D.)