cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: 03_0616
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/
Supplementary Materials from The genetic basis and potential molecular mechanism of yellow-albino Northern snakehead (Channa argus)
Creators: name: Sun, Donglei
name: Qi, Xin
name: Wen, Haishen
name: Li, Chao
name: Li, Jianlong
name: Chen, Jiwei
name: Tao, Zexin
name: Zhu, Mingxin
name: Zhang, Xiaoyan
name: Li, Yun
Publisher: name: The Royal Society
Year: 2023

description: Body colour is an important economic trait for commercial fishes. Recently, a new colour morph displaying market-favoured yellow skin (termed as yellow-mutant, YM) of Northern snakehead (Channa argus) was discovered in China. We confirmed that YM snakehead is an albino with complete loss of melanin in the skin and eyes by histological and ultrastructural observations, and inherited as a recessive Mendelian trait. By applying genomic analysis approaches, in combination with gene knockdown and rescue experiments, we suggested a non-sense mutation in slc45a2 (c.383G > A) is the causation for the YM snakehead. Notably, significantly higher levels of key melanogenesis genes (tyr, tyrp1, dct and pmel) and phospho-MITF protein were detected in YM snakehead than those in wide-type individuals, and the underlying mechanism was further investigated by comparative transcriptomic analysis. Results revealed that differential expressed genes involved in pathways like MAPK, WNT and calcium signalling were significantly induced in YM snakehead, which might account for the increased amount of melanogenesis elements, and presumably be stimulated by fibroblast-derived melanogenic factors in a paracrine manner. Our study clarified the genetic basis of colour variation in C. argus and provided the preliminary clue indicating the potential involvement of fibroblasts in pigmentation in fish.
Spintronic THz emitters based on transition metals and semi-metals/Pt multilayers
Creators: name: Hawecker, J.
name: Rongione, E.
name: Markou, A.
name: Krishnia, S.
name: Godel, F.
name: Collin, S.
name: Lebrun, R.
name: Tignon, J.
name: Mangeney, J.
name: Boulier, T.
name: George, J. -M.
name: Felser, C.
name: Jaffrès, H.
name: Dhillon, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spintronic terahertz (THz) emitters (STE) based on the inverse spin Hall effect in ferromagnetic/heavy metal (FM/HM) heterostructures have become important sources for THz pulse generation. The design, materials and control of these interfaces at the nanometer level has become vital to engineer their THz emission properties.In this work, we present studies of the optimization of such structures through a multi-pronged approach, taking advantage of material and interface engineering to enhance the THz spintronic emission. This includes: the application of multi-stacks of HM/FM junctions and their application to trilayer structures, the use of spin-sinks to simultaneously enhance the THz emitted fields and reduce the use of thick Pt layers to reduce optical absorption, and the use of semi-metals to increase the spin polarization and thus the THz emission. Through these approaches, significant enhancements of the THz field can be achieved. Importantly, taking into account the optical absorption permits to elucidate novel phenomena such as the relation between the spin diffusion length and the spin-sink using THz spectroscopy, as well as possibly distinguishing between self and interface spin-to-charge conversion in semi-metals.
description: submitted to Applied Physics Letters (2022)
A Social Identity Understanding of Depression: Implications for Onset, Maintenance and Recovery
Creators: name: Novelli, David
Publisher: name: UH Research Archive
Year: 2016
Subjects: social identity
group processes
depression
social support
optimism
psychological therapy

description: The literature on depression is dominated by theories which focus on individualistic variables, including biological differences, personality, and individual cognition. Whilst the importance of social variables for depression risk and recovery has also been recognised, there has been a notable absence of a unifying theory explaining, how, when, and why they might impact on depression. In recent years, the Social Identity Approach (SIA) – a theoretical framework with roots in social psychology – has been used to provide a new understanding of the role of group processes in depression. The aim of this thesis was to add to a growing body of evidence in support of the SIA to depression by replicating previous findings using a sample, who on average, scored high on a measure of depression symptomology, and by identifying additional mediators of the relationship between social identity processes and depression. Specifically, it was theorised that optimism – a personality variable associated with depression, but traditionally conceptualised as a fixed trait – would vary along with group memberships and mediate the effect of social identity processes on depression. Participants who had experienced depression (N = 288) completed an online survey. It was found that in support of previous research, an increase in group involvement predicted lower depression scores. However, this relationship was mediated by increased optimism. Similarly, identifying more strongly with a specific group predicted depression indirectly through an increase in perceived social support, and increased optimism. For a sub-sample of participants with experience of psychological therapy (N = 135), the negative association between a good therapeutic alliance and depression was serially mediated by increased identification with the therapist, internalisation of the therapist identity between sessions, and increased optimism. The extent to which the therapist was perceived as prototypical of therapists in general also indirectly reduced depression via increased identification with the therapist category, and increased optimism. These findings are discussed in relation to the further development of the social identity approach to depression, with consideration of their implications for onset, maintenance and recovery.
Inhibitory Synaptic Plasticity and Gain Modulation in Cerebellar Nucleus Neurons
Creators: name: Bampasakis, Dimitris
Publisher: name: UH Research Archive
Year: 2016
Subjects: gain modulation
short term depression
neuronal arithmetic
cerebellum
Purkinje cell
synaptic plasticity
neural coding

description: Neurons can encode information using the rate of their action potentials, making the relation between input rate and output rate a prominent feature of neuronal information processing. This relation, known as I-O function, can rapidly change in response to various factors or neuronal processes. Most noticeably, a neuron can undergo a multiplicative operation, resulting in a change of the slope of its I-O curve, also know as gain change. Gain changes represent multiplicative operations, and they are wide- spread. They have been found to play an important role in the encoding of spatial location and coordinate transformation, to signal amplification, and other neuronal functions. One of the factors found to introduce and control neuronal gain is synaptic Short Term Depression (STD). We use both integrate-and- re and conductance based neuron models to identify the effect of STD in excitatory and inhibitory modulatory input. More specifically, we are interested in the effect of STD at the inhibitory synapse from Purkinje cells to cerebellar nucleus neurons. Using a previously published, biologically realistic model, we find that the presence of STD results in a gain change. Most importantly we identify STD at the inhibitory synapse to enable excitation-mediated gain control. To isolate the mechanism that allows excitation to control gain, even though STD is applied at a different synapse, we first show that the overall effect is mediated by average conductance. Having done this, we find that the effect of STD is based on the non-linearity introduced in the relation between input rate and average conductance. We find this effect to vary, depending on the position of the I-O function on the input rate axis. Modulatory input shifts the I-O curve along the input rate axis, consequently shifting it to a position where STD has a different effect. The gain differences in the STD effects between the two positions enable excitation to perform gain control.
Evolution of Spiking Neural Networks for Temporal Pattern Recognition and Animat Control
Creators: name: Abdelmotaleb, Ahmed Mostafa Othman
Publisher: name: UH Research Archive
Year: 2016
Subjects: Evolving Spiking Neural Networks
Temporal Pattern Recognition
Animat Foraging
Genetic Algorithm
Gene regulatory networks
Leaky integrate and fire
Spinnaker
Evolutionary algorithm

description: I extended an artificial life platform called GReaNs (the name stands for Gene Regulatory evolving artificial Networks) to explore the evolutionary abilities of biologically inspired Spiking Neural Network (SNN) model. The encoding of SNNs in GReaNs was inspired by the encoding of gene regulatory networks. As proof-of-principle, I used GReaNs to evolve SNNs to obtain a network with an output neuron which generates a predefined spike train in response to a specific input. Temporal pattern recognition was one of the main tasks during my studies. It is widely believed that nervous systems of biological organisms use temporal patterns of inputs to encode information. The learning technique used for temporal pattern recognition is not clear yet. I studied the ability to evolve spiking networks with different numbers of interneurons in the absence and the presence of noise to recognize predefined temporal patterns of inputs. Results showed, that in the presence of noise, it was possible to evolve successful networks. However, the networks with only one interneuron were not robust to noise. The foraging behaviour of many small animals depends mainly on their olfactory system. I explored whether it was possible to evolve SNNs able to control an agent to find food particles on 2-dimensional maps. Using ring rate encoding to encode the sensory information in the olfactory input neurons, I managed to obtain SNNs able to control an agent that could detect the position of the food particles and move toward it. Furthermore, I did unsuccessful attempts to use GReaNs to evolve an SNN able to control an agent able to collect sound sources from one type out of several sound types. Each sound type is represented as a pattern of different frequencies. In order to use the computational power of neuromorphic hardware, I integrated GReaNs with the SpiNNaker hardware system. Only the simulation part was carried out using SpiNNaker, but the rest steps of the genetic algorithm were done with GReaNs.
The Experience of Feeling Fat for Women with an Anorexia Nervosa Diagnosis: an Interpretative Phenomenological Analysis
Creators: name: Major, Laura
Publisher: name: UH Research Archive
Year: 2016

description: Aim: The experience of feeling fat has been implicated as a maintenance factor in Anorexia Nervosa (AN); however, little research has been conducted into the experience. The present study aimed to explore the experience of feeling fat for women with an AN diagnosis. It was hoped that this would provide an insight into the experience of feeling fat and the ways it could be addressed within therapeutic interventions for AN. Methodology: Semi-structured interviews were conducted with seven women with an AN diagnosis. All participants were receiving therapy at the time of their interview. The verbatim transcripts from these interviews were analysed using Interpretative Phenomenological Analysis (IPA) in order to explore the lived experience of feeling fat for women with an AN diagnosis. Results: Four superordinate themes emerged from the analysis, these were: negative sense of self; feeling out of control; coping with feeling fat and the complex notion of feeling fat. These superordinate themes and corresponding subordinate themes are discussed. Implications: Feeling fat was found to be a significant experience for the adult women who participated within this study. This research highlights the importance of addressing the experience of feeling fat within therapeutic interventions for adult women with an AN diagnosis. The clinical relevance of these findings are explored.
Designing Motivational Games for Robot-Mediated Stroke Rehabilitation
Creators: name: Shah, Nauman
Publisher: name: UH Research Archive
Year: 2016
Subjects: Serious Games
Stroke
Rehabilitation
Motivation
Rehabilitation Robotics
Game Design
Hemiparesis
Robotic Glove

description: The repetitive and sometimes mundane nature of conventional rehabilitation therapy provides an ideal opportunity for development of interactive and challenging therapeutic games that have the potential to engage and motivate the players. Different game design techniques can be used to design rehabilitation games that work alongside robotics to provide an augmentative therapy to stroke patients in order to increase their compliance and motivation towards therapy. The strategy we followed to develop such a system was to (i) identify the key design parameters that can influence compliance, prolonged activity, active participation and patient motivation, (ii) use these parameters to design rehabilitation games for robot-mediated stroke-rehabilitation, (iii) investigate the effects of these parameters on motivation and performance of patients undergoing home-based rehabilitation therapy. Three main studies were conducted with healthy subjects and stroke subjects. The first study identified the effects of the design parameters on healthy players‘ motivation. Using the results from this study, we incorporated the parameters into rehabilitation games, following player-centric iterative design process, which were formatively evaluated during the second study with healthy subjects, stroke patients, and health-care professionals. The final study investigated the research outcomes from use of these games in three patient‘s homes during a 6 weeks clinical evaluation. In summary, the research undertaken during this PhD successfully identified the design techniques influencing patient motivation and adherence as well as highlighted further important elements that contribute to maintaining therapeutic interaction between patients and the therapy medium, mainly the technological usability and reliability of the system.
The synchronised dance of the Magellanic Clouds' star formation history
Creators: name: Massana, P.
name: Ruiz-Lara, T.
name: Noël, N. E. D.
name: Gallart, C.
name: Nidever, D. L.
name: Choi, Y.
name: Sakowska, J. D.
name: Besla, G.
name: Olsen, K. A. G.
name: Monelli, M.
name: Dorta, A.
name: Stringfellow, G. S.
name: Cassisi, S.
name: Bernard, E. J.
name: Zaritsky, D.
name: Cioni, M. -R. L.
name: Monachesi, A.
name: van der Marel, R. P.
name: de Boer, T. J. L.
name: Walker, A. R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use the SMASH survey to obtain unprecedented deep photometry reaching down to the oldest main sequence turn-offs in the colour-magnitude diagrams (CMDs) of the Small Magellanic Cloud (SMC) and quantitatively derive its star formation history (SFH) using CMD fitting techniques. We identify five distinctive peaks of star formation in the last 3.5 Gyr, at $\sim $3, $\sim$2, $\sim$1.1, $\sim $0.45 Gyr ago, and one presently. We compare these to the SFH of the Large Magellanic Cloud (LMC) finding unequivocal synchronicity, with both galaxies displaying similar periods of enhanced star formation over the past $\sim$3.5 Gyr. The parallelism between their SFHs indicates that tidal interactions between the MCs have recurrently played an important role in their evolution for at least the last $\sim$3.5 Gyr, tidally truncating the SMC and shaping the LMC's spiral arm. We show, for the first time, an SMC-LMC correlated SFH at recent times in which enhancements of star formation are localised in the northern spiral arm of the LMC, and globally across the SMC. These novel findings should be used to constrain not only the orbital history of the MCs but also how star formation should be treated in simulations.
description: 6 pages, 4 figures. Accepted for publication to MNRAS Letters
Supplementary Material for: Two-Thirds of Survey Respondents in Southern Sweden Used Complementary or Alternative Medicine in 2015
Creators: name: Wemrell, M.
name: Merlo, J.
name: Mulinari, S.
name: Hornborg, A.C.
Publisher: name: Karger Publishers
Year: 2017
Subjects: Medicine

description: Background: Research has long suggested that a large and possibly growing number of people use complementary or alternative medicine (CAM). However, in many countries, such as Sweden, national and regional research on CAM use is still very limited. Existing prevalence studies are few and characterized by low comparability. This study aims to contribute towards addressing this knowledge gap. Methods: A web-based survey measured the use of and attitude towards CAM and conventional medicine in the southernmost Swedish province of Scania, while taking part in the development of a measurement tool for the standardized study of CAM use within the European Union (EU; I-CAM-Q). Results: 71% of the respondents (n = 1,534) reported having used some form of CAM in the past year. CAM consumption here includes visits to CAM providers, use of natural remedies, and use of selfhelp methods. Reported use was more common among women, younger age groups, and people with tertiary education. 69% of the respondents stated that collaboration between conventional medicine and complementary medicine should increase. The survey’s response rate was 31%. Conclusions: The study confirms that CAM forms a considerable part of the health care offered to and used by the population. In the face of the existing lack of national and regional data on CAM usage, it affirms the importance of furthered investigation of CAM consumption, policy, practice, regulation, and education.
Uniaxial Pressure Induced Stripe Order Rotation in La$_{1.88}$Sr$_{0.12}$CuO$_4$
Creators: name: Wang, Qisi
name: von Arx, K.
name: Mazzone, D. G.
name: Mustafi, S.
name: Horio, M.
name: Küspert, J.
name: Choi, J.
name: Bucher, D.
name: Wo, H.
name: Zhao, J.
name: Zhang, W.
name: Asmara, T. C.
name: Sassa, Y.
name: Månsson, M.
name: Christensen, N. B.
name: Janoschek, M.
name: Kurosawa, T.
name: Momono, N.
name: Oda, M.
name: Fischer, M. H.
name: Schmitt, T.
name: Chang, J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Static stripe order is detrimental to superconductivity. Yet, it has been proposed that transverse stripe fluctuations may enhance the inter-stripe Josephson coupling and thus promote superconductivity. Direct experimental studies of stripe dynamics, however, remain difficult. From a strong-coupling perspective, transverse stripe fluctuations are realized in the form of dynamic "kinks" -- sideways shifting stripe sections. Here, we show how modest uniaxial pressure tuning reorganizes directional kink alignment. Our starting point is La$_{1.88}$Sr$_{0.12}$CuO$_4$, where transverse kink ordering results in a rotation of stripe order away from the crystal axis. Application of mild uniaxial pressure changes the ordering pattern and pins the stripe order to the crystal axis. This reordering occurs at a much weaker pressure than that to detwin the stripe domains and suggests a rather weak transverse stripe stiffness. Weak spatial stiffness and transverse quantum fluctuations are likely key prerequisites for stripes to coexist with superconductivity.
description: Accepted in Nature Communications
Characterising the Quality Journey of Total Quality Management in Relation to the Financial Performance of SMEs Under Crisis Conditions: the Case for Greece
Creators: name: Sainis, George
Publisher: name: UH Research Archive
Year: 2018
Subjects: Total Quality Management
SME’s
Quality elements
ISO
Quality Certification
Quality Performance
Quality tools and techniques
Quality Culture
Financial Performance
Ratio Analysis
Quality Appraisal Systems

description: During the last few years Greece is coping with severe economic and financial crisis conditions. Since the Greek SME are the largest productive and economic sector in the Greek economy, they bear the brunt of consequences for these adverse conditions. This thesis investigates the role of the total quality elements in improving or otherwise the financial performance of those SME. Ratio analysis is used as a mean of measuring the SME financial performance and specifically the level of their liquidity, profitability, efficiency and solvency. Furthermore the thesis tries to identify the role that each quality element and quality as a whole, have on different size SME and their financial performance. A data-triangulation methodology was developed to examine the influence of the above factors (use of a questionnaire and a set of semi-structured interviews) and the results and the conclusions derived have shown that:- - All the Greek SME have the intention to continue their quality journey to TQM. - Small SME give more emphasis in implementing the TQM elements, followed by the micro and the medium size SME respectively. However each group of SME prioritises differently the various quality elements. - The ratio analysis revealed that the group with the mostly improved financial performance was the micro SME followed by the small and the medium SME. - The worst financial performance of all the SME occurred between 2008 and 2010. - Amongst the SME that have managed to continue to operate, the ones characterised as TQM SME have shown an improved financial performance. Measuring the SME financial performance, efficiency and solvency were revealed as the most significant variables. The smaller in size the SME were, they pay a greater attention to efficiency while the larger SME pay more attention to solvency. - Utilising the Z-score rate as a criterion, the largest number of transitions among different levels of financial sustainability was revealed from the micro SME. Lower variability was identified from the TQM SME group in comparison with the other two groups of SME (ISO+ and ISO) that have also shown a very similar behaviour. In conclusion SME’s that have followed the ISO to TQM journey during the harsh financial conditions they were facing, they have managed to harbour themselves better in conditions of financial crisis.
An Ultraluminous Supersoft Source in a Dwarf Galaxy of Abell 85: An Intermediate-Mass Black Hole Candidate
Creators: name: Mićić, Marko
name: Irwin, Jimmy A.
name: Lin, Dacheng
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study a large sample of dwarf galaxies using archival Chandra X-ray observations, with the aim of detecting accreting intermediate-mass black holes (IMBHs). IMBHs are expected to inhabit dwarf galaxies and to produce specific signatures in terms of luminosity and X-ray spectra. We report the discovery of an X-ray source associated with an Abell 85 dwarf galaxy that fits the IMBH description. The stellar mass of the host galaxy is estimated to be 2 $\times$ 10$^8$ $M_\odot$, which makes it one of the least massive galaxies to potentially host an accreting black hole. The source is detected in the soft band, under 1 keV, while undetected at higher energies. The X-ray luminosity is $\approx$ 10$^{41}$ erg s$^{-1}$, making it almost three orders of magnitude more luminous than the most luminous stellar-mass supersoft emitters. From the galaxy stellar mass vs. black hole mass relation, we estimate the mass to be within the intermediate regime. Another method that resulted in an intermediate mass relies on the fact that supersoft emission is expected to be associated with high accretion rates, approaching the Eddington limit. We suggest that the observed offset of the X-ray source from the galactic center ($\approx$ 1.8 kpc) is due to galaxy interactions, and we present evidence from the literature that supports the relation between black hole activity and galaxy interactions.
description: Accepted for publication in ApJ
Intensity $g^{(2)}$-correlations in random fiber lasers: A random matrix theory approach
Creators: name: Raposo, Ernesto P.
name: Gonzáles, Iván R. R.
name: Coronel, Edwin D.
name: Macêdo, Antônio M. S.
name: Menezes, Leonardo de S.
name: Kashyap, Raman
name: Gomes, Anderson S. L.
name: Kaiser, Robin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We propose a new approach based on random matrix theory to calculate the temporal second-order intensity correlation function $g^{(2)}(t)$ of the radiation emitted by random lasers and random fiber lasers. The multimode character of these systems, with a relevant degree of disorder in the active medium, and large number of random scattering centers substantially hinder the calculation of $g^{(2)}(t)$. Here we apply for the first time in a photonic system the universal statistical properties of Ginibre's non-Hermitian random matrix ensemble to obtain $g^{(2)}(t)$. Excellent agreement is found with time-resolved measurements for several excitation powers of an erbium-based random fiber laser. We also discuss the extension of the random matrix approach to address the statistical properties of general disordered photonic systems with various Hamiltonian symmetries.
description: 5 pages, 4 figures
Absorption Variability of the Highly Obscured Active Galactic Nucleus NGC 4507
Creators: name: Jana, Arghajit
name: Ricci, Claudio
name: Naik, Sachindra
name: Tanimoto, Atsushi
name: Kumari, Neeraj
name: Chang, Hsiang-Kuang
name: Nandi, Prantik
name: Chatterjee, Arka
name: Safi-Harb, Samar
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a detailed study of the highly obscured active galaxy NGC 4507, performed using four Nuclear Spectroscopic Telescope Array (NuSTAR) observations carried out between May and August in 2015 (~ 130 ks in total). Using various phenomenological and physically motivated torus models, we explore the properties of the X-ray source and those of the obscuring material. The primary X-ray emission is found to be non-variable, indicating a stable accretion during the period of the observations. We find the equatorial column density of the obscuring materials to be ~ 2 x 10^24 cm^-2 while the line of sight column density to be ~ 7 - 8 x 10^23 cm^-22. The source is found to be deeply buried with the torus covering factor ~ 0.85. We observe variability in the line-of-sight column density on a timescale of < 35 days. The covering factor of the Compton-Thick material is found to be ~ 0.35, in agreement with the results of recent X-ray surveys. From the variability of the line-of-sight column density, we estimate that the variable absorbing material is likely located either in the BLR or in the torus.
description: 20 pages, 15 figures, 8 tables, accepted for publication in MNRAS
Grid of pseudo-2D chemistry models for tidally locked exoplanets -- II. The role of photochemistry
Creators: name: Baeyens, Robin
name: Konings, Thomas
name: Venot, Olivia
name: Carone, Ludmila
name: Decin, Leen
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Photochemistry is expected to change the chemical composition of the upper atmospheres of irradiated exoplanets through the dissociation of species, such as methane and ammonia, and the association of others, such as hydrogen cyanide. Although primarily the high altitude day side should be affected by photochemistry, it is still unclear how dynamical processes transport photochemical species throughout the atmosphere, and how these chemical disequilibrium effects scale with different parameters. In this work we investigate the influence of photochemistry in a two-dimensional context, by synthesizing a grid of photochemical models across a large range of temperatures. We find that photochemistry can strongly change the atmospheric composition, even up to depths of several bar in cool exoplanets. We further identify a sweet spot for the photochemical production of hydrogen cyanide and acetylene, two important haze precursors, between effective temperatures of 800 and 1400 K. The night sides of most cool planets (effective temperature < 1800 K) are shown to host photochemistry products, transported from the day side by horizontal advection. Synthetic transmission spectra are only marginally affected by photochemistry, but we suggest that observational studies probing higher altitudes, such as high-resolution spectroscopy, take photochemistry into account.
description: 16 pages, 9 figures, accepted for publication in MNRAS
Incidence, distribution and genetic diversity of Grapevine red blotch virus in British Columbia
Creators: name: S. Poojari
name: D. T. Lowery
name: M. Rott
name: A. M. Schmidt
name: J. R. Úrbez-Torres
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Biotechnology
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: 60506 Virology

description: Grapevine red blotch virus (GRBV) is a recently identified virus reported mainly from several grape-growing regions in the USA. To date, no information about the occurrence of GRBV is available in British Columbia (BC). Accordingly, a large-scale survey was conducted across all grape-growing regions of BC to determine the incidence and distribution of GRBV. A total of 2000 composite samples representing nine white and eight red Vitis vinifera cultivars from 128 vineyard blocks were tested for GRBV by PCR using virus-specific primers. The results showed that 32 out of 2000 (1.6%) composite samples were positive for GRBV, indicating a low incidence of this virus in BC vineyards. An analysis of the vineyard blocks positive for GRBV revealed that they were established between 2011 and 2014, suggesting a recent introduction of GRBV into BC, probably through infected plant material. Complete genome characterization and phylogenetic analysis of 29 representative GRBV isolates from BC grouped 15 isolates into clade I, sharing less than 95% identity at the nucleotide level, whereas 14 isolates grouped into clade II, sharing more than 95% identity at the nucleotide level. This result was consistent with the presence of both genetic variants in BC vineyards. Putative recombination events were detected among aligned complete genome sequences of BC isolates of GRBV and global isolates of the virus. These findings underscore the need for domestic clean plant propagation programmes and development of long-term management strategies to minimize GRBV spread in BC.
Role of 6-Mercaptopurine in the potential therapeutic targets DNA base pairs and G-quadruplex DNA: insights from quantum chemical and molecular dynamics simulations
Creators: name: R. Radhika
name: R. Shankar
name: S. Vijayakumar
name: P. Kolandaivel
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Molecular Biology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Computational Biology

description: The theoretical studies on DNA with the anticancer drug 6-Mercaptopurine (6-MP) are investigated using theoretical methods to shed light on drug designing. Among the DNA base pairs considered, 6-MP is stacked with GC with the highest interaction energy of –46.19 kcal/mol. Structural parameters revealed that structure of the DNA base pairs is deviated from the planarity of the equilibrium position due to the formation of hydrogen bonds and stacking interactions with 6-MP. These deviations are verified through the systematic comparison between X–H bond contraction and elongation and the associated blue shift and red shift values by both NBO analysis and vibrational analysis. Bent’s rule is verified for the C–H bond contraction in the 6-MP interacted base pairs. The AIM results disclose that the higher values of electron density (ρ) and Laplacian of electron density (∇2ρ) indicate the increased overlap between the orbitals that represent the strong interaction and positive values of the total electron density show the closed-shell interaction. The relative sensitivity of the chemical shift values for the DNA base pairs with 6-MP is investigated to confirm the hydrogen bond strength. Molecular dynamics simulation studies of G-quadruplex DNA d(TGGGGT)4 with 6-MP revealed that the incorporation of 6-MP appears to cause local distortions and destabilize the G-quadruplex DNA.
Effect of the sulphur atom on geometry and spectra of the biomolecule 2-thiouracil and in the WC base pair 2-thiouridine-adenosine. Influence of water in the first hydration shell
Creators: name: M. Alcolea Palafox
name: V.K. Rastogi
name: S.P. Singh
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Molecular Biology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Inorganic Chemistry

description: The effect of the sulphur atom on 2-thiouracil (2TU) and 2-thiouridine molecules, as compared with uracil and uridine molecules, respectively, was carried out in several environments. The predicted IR spectrum of 2TU in the isolated state was compared with that obtained for uracil molecule and with those reported experimentally in matrix isolation. Its crystal unit cell in the solid state was simulated through a tetramer form using DFT methods for the first time. The calculated Raman spectrum was compared to the experimental ones in the solid state. A linear scaling procedure was used for this task. The first hydration shell was simulated by explicit number of water molecules surrounding 2TU up to 30 and was compared with that obtained in uracil molecule. Water molecules ‘distributed’ around 2TU was preferred over that ‘clustering’, because it can better reproduce the hydration and their effects on different parameters of the molecular structure of 2TU and uracil. The total atomic charges and several calculated thermodynamic parameters were discussed. The effect of the sulphur atom on the Watson-Crick (WC) and reverse WC base pair uridine-adenosine was estimated, and the CP corrected interaction energies were calculated. 2-thiouridine has a weaker WC pair than that with uridine, although its slight higher dipole moment (μ) facilitates the interaction with the water molecules. Several helical parameters were determined.
Wide-Band Spectral Variability of Peaked Spectrum Sources
Creators: name: Ross, K.
name: Hurley-Walker, N.
name: Seymour, N.
name: Callingham, J. R.
name: Galvin, T. J.
name: Johnston-Hollitt, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Characterising spectral variability of radio sources is a technique that offers the ability to determine the astrophysics of the intervening media, source structure, emission and absorption processes. We present broadband (0.072--10 GHz) spectral variability of 15 peaked-spectrum (PS) sources with the Australia Telescope Compact Array (ATCA) and the Murchison Widefield Array (MWA). These 15 PS sources were observed quasi-contemporaneously with ATCA and the MWA four to six times during 2020 with approximately a monthly cadence. Variability was not detected at 1--10GHz frequencies but 13 of the 15 targets show significant variability with the MWA at megahertz frequencies. We conclude the majority of variability seen at megahertz frequencies is due to refractive interstellar scintillation of a compact component ~25 mas across. We also identify four PS sources that show a change in their spectral shape at megahertz frequencies. Three of these sources are consistent with a variable optical depth from an inhomogeneous free-free absorbing cloud around the source. One PS source with a variable spectral shape at megahertz frequencies is consistent with an ejection travelling along the jet. We present spectral variability as a method for determining the physical origins of observed variability and for providing further evidence to support absorption models for PS sources where spectral modelling alone is insufficient.
description: Accepted for publication in MNRAS. 17 pages, 10 figures
The OmegaWhite Survey for Short Period Variable Stars VI. Open Clusters
Creators: name: Toma, R.
name: Ramsay, G.
name: Jeffery, C. S.
name: Macfarlane, S. A.
name: Woudt, P.
name: Groot, P. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using light curves with $\sim$3 min cadence and a duration of 2 hrs made using the OmegaWhite survey, we present the results of a search for short-period variable stars in the field of 20 open clusters. We identified 92 variable stars in these fields. Using a range of cluster member catalogues and Gaia EDR3 data, we have determined that 10 are cluster members and 2 more are probable members. Based on their position on the Gaia HRD and their photometric periods, we find that most of these are $δ$ Sct stars. We obtained low-resolution optical spectroscopy of some of these cluster members and field stars. We discuss the cluster variable stars in the context of $δ$ Sct stars in other open clusters.
description: Accepted for publication in MNRAS. 20 pages, 14 figures
Automatic Detection of Accretion Bursts in Young Stellar Objects: a New Algorithm for Long--Term Sky Surveys
Creators: name: Strafella, F.
name: Altavilla, G.
name: Giannini, T.
name: Giunta, A.
name: Lorenzetti, D.
name: Nucita, A.
name: Franco, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Young stellar objects in their pre-main sequence phase are characterized by irregular changes in brightness, generally attributed to an increase of the mass accretion rate due to various kind of instabilities occurring in the circumstellar disk. In the era of large surveys aimed to monitor the sky, we present a pipeline to detect irregular bursts, in particular EXors-like ( EX Lupi type eruptive variables), in the light curves. The procedure follows a heuristic approach and is tested against the light curves already collected for a few objects presently recognized as bona fide or candidate EXors.
description: 19 pages, 5 figures. In press in New Astronomy
A Bayesian Approach for Shaft Centre Localisation in Journal Bearings
Creators: name: Lindley, Christopher A.
name: Beamish, Scott
name: Dwyer-Joyce, Rob
name: Dervilis, Nikolaos
name: Worden, Keith
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: It has been shown that ultrasonic techniques work well for online measuring of circumferential oil film thickness profile in journal bearings; unfortunately, they can be limited by their measuring range and unable to capture details of the film all around the bearing circumference. Attempts to model the film thickness over the full range of the bearing rely on deterministic approaches, which assume the observations to be true with absolute certainty. Unaccounted uncertainties of the film thickness may lead to a cascade of inaccurate predictions for subsequent calculations of hydrodynamic parameters. In the present work, a probabilistic framework is proposed to model the film thickness with Gaussian Processes. The results are then used to estimate the location of the bearing shaft under various operational conditions. A further step in the process involves using the newly-constructed dataset to generate likelihood maps displaying the probable location of the shaft centre, given the bearing rotational speed and applied static load. The results offer the possibility to visualise the confidence of the predictions and allow the true location to be found within an area of high probability within the bearing's bore.
Supervised and Unsupervised Machine Learning of Structural Phases of Polymers Adsorbed to Nanowires
Creators: name: Parker, Quinn
name: Perera, Dilina
name: Li, Ying Wai
name: Vogel, Thomas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We identify configurational phases and structural transitions in a polymer nanotube composite by means of machine learning. We employ various unsupervised dimensionality reduction methods, conventional neural networks, as well as the confusion method, an unsupervised neural-network-based approach. We find neural networks are able to reliably recognize all configurational phases that have been found previously in experiment and simulation. Furthermore, we locate the boundaries between configurational phases in a way that removes human intuition or bias. This could be done before only by relying on preconceived, ad-hoc order parameters.
Cosmological Simulations with AGN Feedback
Creators: name: Taylor, Philip
Publisher: name: UH Research Archive
Year: 2016
Subjects: black holes
AGN
numerical simulations

description: We implement a model for, and study the effects of, AGN feedback in cosmological hydrodynamical simulations. In our model, black holes form high-density, primordial gas, to imitate the likely channels of black hole formation in the early Universe. We find that a black hole seed mass of 102−3h−1M⊙ is required to produce simulations that match the cosmic star formation rate density, and present-day black hole mass – velocity dispersion and galaxy size – velocity dispersion relations. We therefore suggest that Population iii stars can be the progenitors of the super-massive black holes seen today. Using our fiducial model, we run two large simulations ((25h−1 Mpc)3), one with and one without AGN feedback. With these, we follow the population of galaxies that forms across cosmic time, and find that the inclusion of AGN feedback improves the agreement of simulated and observed galaxy properties, such as the mass and luminosity functions. This agreement is best at z = 0, and fairly good out to z = 2−3. Evidence for downsizing in the evolution of galaxies is found, both in the present-day colour–magnitude and [α/Fe]–velocity dispersion relations, and by the fact that high-mass galaxies attain their present-day metallicity earlier and faster than do low-mass ones. With our hydrodynamical simulations, we can also investigate the internal structure of galaxies, and look at the effects of galaxy mergers and AGN feedback on the stellar and gas-phase metallicity gradients of galaxies. Stellar metallicity gradients are found to be sensitive to galaxy mergers, while gas-phase metallicity gradients are more affected by AGN activity. This suggests that simultaneous measurements of these two quantities can help disentangle the actions of mergers and AGN feedback on a galaxy’s history. Finally, we develop a new method to identify massive AGN-driven outflows from the most massive simulated galaxy. These events cause the intra-cluster medium to be hotter and more chemically enriched compared to the simulation without AGN feedback, and therefore AGN feedback may be required in order to attain the metallicities observed in clusters.
Probing the shot behaviour in Cygnus X-1 using simultaneous AstroSat-NICER observation
Creators: name: Bhargava, Yash
name: Hazra, Nandini
name: Rao, A. R.
name: Misra, Ranjeev
name: Bhattacharya, Dipankar
name: Roy, Jayashree
name: Alam, Md. Shah
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We analyse the aperiodic flaring features, also known as shots, observed in Cyg X-1 in the 0.1-80 keV energy band using a 6.39 ks simultaneous observation with AstroSat and NICER. We detect 49 simultaneous shots in the soft and hard X-ray bands with NICER and AstroSat-LAXPC, respectively. We observe the shot profile for the first time in soft X-rays (0.1-3 keV), which shows a spectral peak at $\sim$2 keV. Using time-averaged spectroscopy, we measured the truncation of the inner accretion disk at $6.7\pm0.2$ gravitational radii. The shot-phase resolved spectroscopy allowed us to identify the origin of some of the brightest aperiodic peaks in the soft X-rays. We find that the accretion rate is consistent with a constant during the shots while the inner edge of the accretion disk moves inwards/outwards as these shots rise/decay. We discuss the possible mechanisms causing the swing in the inner radius.
description: 12 pages, 7 figures, Accepted for publication in MNRAS