cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Thermodynamics of acoustic black holes in two dimensions
Creators: name: Zhang, Baocheng
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is well-known that the thermal Hawking-like radiation can be emitted from the acoustic horizon, but the thermodynamic-like understanding for acoustic black holes was rarely made. In this paper, we will show that the kinematic connection can lead to the dynamic connection at the horizon between the fluid and gravitational models in two dimension, which implies that there exists the thermodynamic-like description for acoustic black holes. Then, we discuss the first law of thermodynamics for the acoustic black hole via an intriguing connection between the gravitational-like dynamics of the acoustic horizon and thermodynamics. We obtain a universal form for the entropy of acoustic black holes, which has an interpretation similar to the entropic gravity. We also discuss the specific heat, and find that the derivative of the velocity of background fluid can be regarded as a novel acoustic analogue of the two-dimensional dilaton potential, which interprets why the two-dimensional fluid dynamics can be connected to the gravitational dynamics but difficult for four-dimensional case. In particular, when a constraint is added for the fluid, the analogue of a Schwarzschild black hole can be realized.
A New Emulated Monte Carlo Radiative Transfer Disk-Wind Model: X-Ray Accretion Disk-wind Emulator -- XRADE
Creators: name: Matzeu, G. A.
name: Lieu, M.
name: Costa, M. T.
name: Reeves, J. N.
name: Braito, V.
name: Dadina, M.
name: Nardini, E.
name: Boorman, P. G.
name: Parker, M. L.
name: Sim, S. A.
name: Barret, D.
name: Kammoun, E.
name: Middei, R.
name: Giustini, M.
name: Brusa, M.
name: Cabrera, J. Pérez
name: Marchesi, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a new X-Ray Accretion Disk-wind Emulator (\textsc{xrade}) based on the 2.5D Monte Carlo radiative transfer code which provides a physically-motivated, self-consistent treatment of both absorption and emission from a disk-wind by computing the local ionization state and velocity field within the flow. \textsc{xrade} is then implemented through a process that combines X-ray tracing with supervised machine learning. We develop a novel emulation method consisting in training, validating, and testing the simulated disk-wind spectra into a purposely built artificial neural network. The trained emulator can generate a single synthetic spectrum for a particular parameter set in a fraction of a second, in contrast to the few hours required by a standard Monte Carlo radiative transfer pipeline. The emulator does not suffer from interpolation issues with multi-dimensional spaces that are typically faced by traditional X-ray fitting packages such as \textsc{xspec}. \textsc{xrade} will be suitable to a wide number of sources across the black-hole mass, ionizing luminosity, and accretion rate scales. As an example, we demonstrate the applicability of \textsc{xrade} to the physical interpretation of the X-ray spectra of the bright quasar PDS 456, which hosts the best-established accretion-disk wind observed to date. We anticipate that our emulation method will be an indispensable tool for the development of high-resolution theoretical models, with the necessary flexibility to be optimized for the next generation micro-calorimeters on board future missions, like \textit{XRISM/resolve} and \textit{Athena/X-IFU}. This tool can also be implemented across a wide variety of X-ray spectral models and beyond.
description: 20 pages, 17 figures, MNRAS accepted for publication
title: Low-frequency spin dynamics as probed by ⁶³Cu and ¹⁹⁹Hg NMR in HgBa₂CuO₄₊δ superconductors with different oxygen content
Creators: name: Gippius, Andrei Andreevich
name: Antipov, Evgeny V.
name: Hoffmann, W.
name: Lüders, Klaus
name: Buntkowsky, Gerd
Publisher: name: American Physical Society
Year: 2023

description: ⁶³Cu and ¹⁹⁹Hg nuclear magnetic resonance was performed on a series of powder HgBa₂CuO₄₊δ samples with different oxygen content δ in order to study the influence of oxygen doping on the spin dynamics in the normal and superconducting state. The spin-lattice relaxation time T₁ of ¹⁹⁹Hg and ⁶³Cu nuclei were measured over a wide range of temperature at different orientations of the crystallites with respect to the magnetic field. For the optimally doped sample (Tc=96 K) we compared our experimental results to numerical calculations of the spin-lattice relaxation rate as a function of temperature below Tc for several types of the order parameter symmetry: isotropic s wave, anisotropic s wave without nodes, s wave with nodes, and d wave, using the different values of the gap parameter 2Δ/kBTc within the AF fluctuation model. The comparison with our experimental relaxation data shows that for ¹⁹⁹Hg nuclei in the orientation B₀∥(a,b) plane as well as for ⁶³Cu nuclei in both orientations, B₀∥(a,b) plane and B₀∥c axis, the experimental results are in coincidence with the dx2₋y2-wave symmetry with the gap parameter 2Δ/kBTc=7.02.
Studies on the biology of dinotoperla species (plecoptera: gripopterygidae) in Victoria
Creators: name: Yule, Catherine Mary.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
HI absorption towards low luminosity radio-loud AGNs of different accretion modes and WISE colours
Creators: name: Chandola, Yogesh
name: Saikia, D. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: H{\sc i} absorption studies of active galaxies enable us to probe their circumnuclear regions and the general interstellar medium, and study the supply of gas which may trigger the nuclear activity. In this paper, we investigate the detection rate of H{\sc i} absorption on the nature of radio galaxies based on their emission-line spectra, nature of the host galaxies based on the \textit{WISE} colours and their radio structure, which may help understand the different accretion modes. We find significant difference in distributions of W2$-$W3 colour for sources with H{\sc i} absorption detections and non-detections. We report a high detection rate of H{\sc i} absorption in the galaxies with \textit{WISE} infrared colours W2$-$W3 $>$ 2, which is typical of gas-rich systems, along with a compact radio structure. The H{\sc i} detection rate for low-excitation radio galaxies (LERGs) with W2$-$W3 $>$ 2 and compact radio structure is high (70.6$\pm$20.4 \%). In HERGs, compact radio structure in the nuclear or circumnuclear region could give rise to absorption by gas in the dusty torus in addition to gas in the interstellar medium. However, higher specific star formation rate (sSFR) for the LERGs with W2$-$W3 $>$ 2 suggests that H{\sc i} absorption may be largely due to star-forming gas in their hosts. LERGs with extended radio structure tend to have significantly lower values of W2$-$W3 compared to those with compact structure. Extended radio sources and those with W2$-$W3 $
description: 10 pages, 7 figures, this updated version is accepted for publication in MNRAS
Cemented LL-ILW; EURAD Domain Insight 3.1.3
Creators: name: Begg
name: Lopez-Garcia
name: , Garcia
Publisher: name: Zenodo
Year: 2023
Subjects: long-lived intermediate level waste
LL-ILW
cement
stabilization
retention
radionuclide mobility
sorption
alkaline environments
containment
durability

description: The roadmap describes typical programme goals, activities and capabilities needed against 7 themes, which are each further broken down into sub-themes and domains in what we can call the Goals Breakdown Structure (GBS). This document provides the overall goal for the Cemented LL-ILW domain (Cemented long-lived intermediate level waste), extracted from the EURAD Roadmap goals breakdown structure (GBS). This is supplemented by typical activities, according to phases of implementation, needed to achieve the domain goal. Activities are generic and are common to most regional and geological disposal programmes.
description: Reviewers: Pierre Henocq, Benny De Blochouse
Long-range interactions between membrane inclusions: Electric field induced giant amplification of the pairwise potential
Creators: name: Pikina, E. S.
name: Muratov, A. R.
name: Kats, E. I.
name: Lebedev, V. V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The aim of this work is to revisit the phenomenological theory of the interaction between membrane inclusions, mediated by the membrane fluctuations. We consider the case where the inclusions are separated by distances larger than their characteristic size. Within our macroscopic approach a physical nature of such inclusions is not essential, however we have always in mind two prototypes of such inclusions: proteins and RNA macromolecules. Because the interaction is driven by the membrane fluctuations, and the coupling between inclusions and the membrane, it is possible to change the interaction potential by external actions affecting these factors. As an example of such external action we consider an electric field. Under external electric field (both dc or ac), we propose a new coupling mechanism between inclusions possessing dipole moments (as it is the case for most protein macromolecules) and the membrane. We found, quite unexpected and presumably for the first time, that the new coupling mechanism yields to giant enhancement of the pairwise potential of the inclusions. This result opens up a way to handle purposefully the interaction energy, and as well to test of the theory set forth in our article.
description: 12 pages
Quantized and half-quantized Anomalous Hall effect induced by in-plane magnetic field
Creators: name: Sun, Song
name: Weng, Hongming
name: Dai, Xi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this paper we propose that, quantized and nearly half-quantized intrinsic anomalous Hall effect can be induced by in-plane external magnetic field through the Zeeman coupling in non-magnetic 2D systems with sizeable spin-orbital coupling but without two-fold rotational symmetry. An analytical result is derived for 2D electron gas model with $C_{3v}$ symmetry. Based on the $\boldsymbol{k\cdot p}$ Hamiltonian derived from first principle calculations, we find that quantized and nearly half-quantized conductance can be observed in $\mathrm{Sb_2Te_3}$ thin film in the clean limit with strong in-plane magnetic field $B>20\ \mathrm{T}$ and low temperature $T<100\ \mathrm{mK}$.
description: 11 pages, 4 figures
Unusual stereochemical effects in reactions of steroids and model compounds
Creators: name: Probert, Michael Keith Stewart.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Numerical Simulations of Early-Stage Dynamics of Electron Bunches Emitted from Plasmonic Photocathodes
Creators: name: Lueangaramwong, Anusorn
name: Mihalcea, Daniel
name: Andonian, Gerard
name: Piot, Philippe
Publisher: name: arXiv
Year: 2016
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: High-brightness electron sources are a key ingredient to the development of compact accelerator-based light sources. The electron sources are commonly based on (linear) photoemission process where a laser pulse with proper wavelength impinges on the surface of a metallic or semiconductor photocathode. Very recently, the use of plasmonic cathodes - cathodes with a nano-patterned surface - have demonstrated great enhancement in quantum efficiencies (Li et al., 2013 [1]). Alternatively, this type of photocathodes could support the formation of structured beams composed of transversely-separated beamlets. In this paper we discuss numerical simulations of the early-stage beam dynamics of the emission process from plasmonic cathodes carried out using the Warp (Friedman et al., 2014 [2]) framework. The model is used to investigate the properties of beams emitted from these photocathode and subsequently combined with particle-in-cell simulations to explore the imaging of cathode pattern after acceleration in a radiofrequency gun.
Simulating Araponga -- The High-Resolution Diffractometer of Brazilian Multipurpose Reactor
Creators: name: Souza, Alexandre P. S.
name: de Oliveira, Luiz P.
name: Genezini, Frederico A.
name: Santos, Adimir dos
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The Brazilian Multipurpose Reactor (RMB) is a fundamental project that aims to turn Brazil into a self-sufficient country in the production of radioisotopes and radiopharmaceuticals to supply the Unified Health System (SUS) as much as the private institutions. In addition, the RMB project describes other applications as irradiation and testing of nuclear fuels and structural material analysis, for instance. There are many techniques in the project to study structural aspects of materials, where neutron diffraction represents one of the priorities for implementation. This technique will take place mainly on two diffractometers on Thermal Neutron Guide 1 (TG1), namely Araponga, a high-resolution diffractometer, and Flautim, a high-intensity diffractometer. In this work, we study the performance of the Araponga diffractometer through McStas simulations with input produced by the MCNP code of the RMB core. We investigate the neutron flux values considering a state-of-art high-resolution diffractometer, and the results are promising since some simulated scenarios present values compatible with high-intensity devices.
description: 10 pages, 2 figures
V410 Puppis: A useful laboratory for early stellar evolution
Creators: name: Erdem, Ahmet
name: Surgit, Derya
name: Ozkardes, Burcu
name: Hadrava, Petr
name: Rhodes, Micheal D.
name: Love, Tom
name: Blackford, Mark G.
name: Banks, Timothy S.
name: Budding, Edwin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: New spectrometric (HERCULES) and ground-based multi-colour photometric data on the multiple star V410 Puppis are combined with satellite photometry (HIPPARCOS and TESS), as well as historic astrometric observations. Absolute parameters for V410 Pup Aab are derived: $M_{Aa}$ = $3.15 \pm 0.10$, $M_{Ab}$ = $1.83 \pm 0.08$ (M$_{\odot}$); $R_{Aa}$ = $2.12 \pm 0.10$, $R_{Ab}$ = $1.52 \pm 0.08$ (R$_\odot$); $a$ = $6.57 \pm 0.04$ R$_\odot$; $T_{Aa}$ = $12500 \pm 1000$, $T_{Ab}$ = $9070 \pm 800$ (K), and photometric distance $350 \pm 10$ (pc). We report the discovery of a low-amplitude SPB variation in the light curve and also indications of an accretion structure around V410 Pup B as well as emission cores in V410 Pup C. We argue that V410 Pup is probably a young formation connected with the Vela 2 OB Association. The combined evidence allows an age in the range 7-25 Myr from comparisons with standard stellar evolution modelling.
description: 14 pages, 15 figures, 12 tables. MNRAS (accepted)
title: Farmer participation in England’s Facilitation Funds
Creators: name: Jackson, Cath
Publisher: name: University of Reading
Year: 2023

description: Participatory processes are relevant to large-scale environmental projects, which require knowledge sharing, decision making and action from a range of stakeholders including farmers, who are the focus of this research. A review of participatory models is used to build a conceptual framework which disaggregates key components of the process: the organisational driver, facilitators’ role and nature of farmers’ participation. Two English initiatives are analysed using primary and secondary data: large-scale environmental projects and the Facilitation Fund scheme (government-resourced farmer groups). Since 2010, non-governmental organisations (NGOs) have dominated the delivery of large-scale environmental projects. Farmers were generally framed as the subjects of the project interventions rather than active participants within it. Facilitation Funds provide an opportunity for farmer group creation, but are related to England’s current AES, over which groups have no control. The affiliation of the facilitator (organisationemployed or independent farm advisor) has an impact on farmers’ participation which may be related to group size. There was a spectrum of farmer participation: 17% of members did not attend any events and 57% attended less than a quarter of events. Generally, farmers were not motivated to join the group by environmental aims. Most did not change their farming practice as a result of group membership because of practical barriers, such as the cost of new equipment. A revised conceptual framework is proposed for future research into farmer participation with a focus on ensuring transparency within project initiation and resourcing, and an emphasis on individuals within the process. Further research is suggested to investigate the proposed link between participation in pro-environmental action and the influence of farmers’ agency and socioeconomic position. Lastly this research reinforces the importance of collaborative action within large-scale environmental projects, and, related to this, codesign of AES.
Anomalous lineshapes in EPR
Creators: name: Sinclair, G. R. .
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
WIMP capture and annihilation in the Earth in effective theories
Creators: name: Catena, Riccardo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I calculate the rate of WIMP capture and annihilation in the Earth in the non-relativistic effective theory of dark matter-nucleon interactions. Neglecting operator interference, I consider all Galilean invariant interaction operators that can arise from the exchange of a heavy particle of spin less than or equal to one when WIMPs have spin 0, 1/2 or 1. I compute position and shape of the expected resonances in the mass - capture rate plane and show that Iron is not the most important element in the capture process for many currently ignored interaction operators. I compare these predictions with the recent results of an Earth WIMP analysis of IceCube in the 86-string configuration and set limits on all isoscalar and isovector coupling constants of the effective theory of dark matter-nucleon interactions. For certain interaction operators and for a dark matter particle mass of about 50 GeV, I find that these limits are stronger than those I have previously derived in an analysis of the solar WIMP search performed at IceCube in the 79-string configuration.
description: 28 pages, 12 figures. In all calculations, $^{59}$Ni replaced by $^{58}$Ni. Main results unchanged
Validating continuous gravitational-wave candidates from a semicoherent search using Doppler modulation and an effective point spread function
Creators: name: Jones, Dana
name: Sun, Ling
name: Carlin, Julian
name: Dunn, Liam
name: Millhouse, Meg
name: Middleton, Hannah
name: Meyers, Patrick
name: Clearwater, Patrick
name: Beniwal, Deeksha
name: Strang, Lucy
name: Vargas, Andrés
name: Melatos, Andrew
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Following up large numbers of candidates in continuous gravitational wave searches presents a challenge, particularly in regard to computational power and the time required to manually scrutinize each of the candidates. It is important to design and test good follow-up procedures that are safe (i.e., minimize false dismissals) and computationally efficient across many search configurations. We investigate two follow-up procedures, or "vetoes," both of which exploit the Doppler modulation predicted in astrophysical signals. In particular, we introduce the concept of using an effective point spread function as part of our veto criteria. We take advantage of a well-established semicoherent search algorithm based on a hidden Markov model to study various search configurations and to generalize the veto criteria by considering the overall veto performance in terms of efficiency and safety. The results can serve as a guideline for follow-up studies in future continuous gravitational wave searches using a hidden Markov model algorithm. The results also apply qualitatively to other semicoherent search algorithms.
description: 24 pages, 15 figures
Towards a better understanding of ice mantle desorption by cosmic rays
Creators: name: Rawlings, Jonathan M. C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The standard model of cosmic ray heating-induced desorption of interstellar ices is based on a continuous representation of the sporadic desorption of ice mantle components from classical (0.1 micron) dust grains. This has been re-evaluated and developed to include tracking the desorption through (extended) grain cooling profiles, consideration of grain size-dependencies and constraints to the efficiencies. A model was then constructed to study the true, sporadic, nature of the process with possible allowances from species co-desorption and whole mantle desorption from very small grains. The key results from the study are that the desorption rates are highly uncertain, but almost certainly significantly larger than have been previously determined. For typical interstellar grain size distributions it is found that the desorption is dominated by the contributions from the smallest grains. The sporadic desorption model shows that, if the interval between cosmic ray impacts is comparable to, or less than, the freeze-out timescale, the continuous representation is inapplicable; chemical changes may occur on very long timescales, resulting in strong gas phase chemical enrichments that have very non-linear dependences on the cosmic ray flux. The inclusion of even limited levels of species co-desorption and/or the contribution from very small grains further enhances the rates, especially for species such as H2O. In general we find that cosmic-ray heating is the dominant desorption mechanism in dark environments. These results may have important chemical implications for protostellar and protoplanetary environments.
description: 19 pages with 3 figures, MNRAS accepted 28 July 2022
Phase Properties of Interacting Bosons in Presence of Quasiperiodic and Random Disorder
Creators: name: Nabi, Sk Noor
name: Roy, Shilpi
name: Basu, Saurabh
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Motivated by two different types of disorder that occur in quantum systems with ubiquity, namely, the random and the quasiperiodic (QP) disorder, we have performed a systematic comparison of the emerging phase properties corresponding to these two cases for a system of interacting bosons in a two dimensional square lattice. Such a comparison is imperative as a random disorder at each lattice is completely uncorrelated, while a quasiperiodic disorder is deterministic in nature. Using a site decoupled mean-field approximation followed by a percolation analysis on a BoseHubbard model, several different phases are realized, such as the familiar Bose-glass (BG), Mott insulator (MI), superfluid (SF) phases, and, additionally, we observe a mixed phase, specific to the QP disorder, which we call as a QM phase. Incidentally, the QP disorder stabilizes the BG phase more efficiently than the case of random disorder. Further, we have employed a finite-size scaling analysis to characterize various phase transitions via computing the critical transition points and the corresponding critical exponents. The results show that for both types of disorder, the transition from the BG phase to the SF phase belongs to the same universality class. However, the QM to the SF transition for the QP disorder comprises of different critical exponents, thereby hinting at the involvement of a different universality class therein. The critical exponents that depict all the various phase transitions occurring as a function of the disorder strength are found to be in good agreement with the quantum Monte-Carlo results available in the literature.
Investigating star-formation activity towards the southern HII region RCW 42
Creators: name: Kumar, Vipin
name: Vig, S.
name: Veena, V. S.
name: Mohan, S.
name: Ghosh, S. K.
name: Tej, A.
name: Ojha, D. K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The star-forming activity in the HII region RCW 42 is investigated using multiple wavebands, from near-infrared to radio wavelengths. Located at a distance of 5.8 kpc, this southern region has a bolometric luminosity of 1.8 $\times$ 10$^6$ L$_{\odot}$. The ionized gas emission has been imaged at low radio frequencies of 610 and 1280 MHz using the Giant Metrewave Radio Telescope, India and shows a large expanse of the HII region, spanning $20\times 15$ pc$^2$. The average electron number density in the region is estimated to be $\sim70$ cm$^{-3}$, which suggests an average ionization fraction of the cloud to be $11\%$. An extended green object EGO G274.0649-01.1460 and several young stellar objects have been identified in the region using data from the 2MASS and Spitzer surveys. The dust emission from the associated molecular cloud is probed using Herschel Space Telescope, which reveals the presence of 5 clumps, C1-C5, in this region. Two millimetre emission cores of masses 380 and 390 M$_{\odot}$ towards the radio emission peak have been identified towards C1 from the ALMA map at 1.4 mm. The clumps are investigated for their evolutionary stages based on association with various star-formation tracers, and we find that all the clumps are in active/evolved stage.
description: 14 pages, 13 figures, 3 tables, Accepted by MNRAS
Configurable Application for Measurements, Experiments and Laboratory Systems
Creators: name: Fuchs, Alexander D.
name: Lehmeyer, Johannes A. F.
name: Oppermann, Patrick
name: Junkes, Heinz
name: Weber, Heiko B.
name: Krieger, Michael
Publisher: name: Zenodo
Year: 2023
Subjects: Research Data Management
RDM
FAIR
NFDI
Metadata

description: We are developing a configurable measurement software (CAMELS) [1], targeted towards the requirements of experimental solid-state physics. Here many experiments utilize a multitude of measurement devices used in dynamically changing setups. [1] https://github.com/FAU-LAP/NOMAD-CAMELS
4 ans déjà ! Explorer paprika.idref.fr : approfondissement autour du contrôle qualité des liens entre notices bibliographiques Sudoc et notices d'autorité IdRef
Creators: name: Melzac, Carole
name: Cordaro, Myriam
name: Siberchicot, Clément
Publisher: name: Zenodo
Year: 2023
Subjects: Sudoc
IdRef
Qualité des notices

description: Session parallèle proposée dans le parcours Qualité
 Quatre ans après son ouverture, venez découvrir ou redécouvrir l’application Paprika et approfondir vos connaissances. Deux fonctionnalités clés seront à l’honneur : la recherche initiale et l’outil d’aide à la décision Qualinka. Ensuite, à travers un retour d’expérience, nous chercherons à répondre à la question : que peut m’apporter Paprika dans mon travail et comment cet outil peut-il s’insérer dans mon contexte particulier ? Vous êtes Coordinateur, Correspondant Autorités ou Catalogage, Catalogueur? Vous voulez des informations pratiques sur cet outil encore récent ? Que vous soyez utilisateur averti ou novice, cette session est pour vous !
Spin Topological Field Theory and Fermionic Matrix Product States
Creators: name: Kapustin, Anton
name: Turzillo, Alex
name: You, Minyoung
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study state-sum constructions of G-equivariant spin-TQFTs and their relationship to Matrix Product States. We show that in the Neveu-Schwarz, Ramond, and twisted sectors, the states of the theory are generalized Matrix Product States. We apply our results to revisit the classification of fermionic Short-Range-Entangled phases with a unitary symmetry G and determine the group law on the set of such phases. Interesting subtleties appear when the total symmetry group is a nontrivial extension of G by fermion parity.
Stabilized Neural Ordinary Differential Equations for Long-Time Forecasting of Dynamical Systems
Creators: name: Linot, Alec J.
name: Burby, Joshua W.
name: Tang, Qi
name: Balaprakash, Prasanna
name: Graham, Michael D.
name: Maulik, Romit
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In data-driven modeling of spatiotemporal phenomena careful consideration often needs to be made in capturing the dynamics of the high wavenumbers. This problem becomes especially challenging when the system of interest exhibits shocks or chaotic dynamics. We present a data-driven modeling method that accurately captures shocks and chaotic dynamics by proposing a novel architecture, stabilized neural ordinary differential equation (ODE). In our proposed architecture, we learn the right-hand-side (RHS) of an ODE by adding the outputs of two NN together where one learns a linear term and the other a nonlinear term. Specifically, we implement this by training a sparse linear convolutional NN to learn the linear term and a dense fully-connected nonlinear NN to learn the nonlinear term. This is in contrast with the standard neural ODE which involves training only a single NN for learning the RHS. We apply this setup to the viscous Burgers equation, which exhibits shocked behavior, and show better short-time tracking and prediction of the energy spectrum at high wavenumbers than a standard neural ODE. We also find that the stabilized neural ODE models are much more robust to noisy initial conditions than the standard neural ODE approach. We also apply this method to chaotic trajectories of the Kuramoto-Sivashinsky equation. In this case, stabilized neural ODEs keep long-time trajectories on the attractor, and are highly robust to noisy initial conditions, while standard neural ODEs fail at achieving either of these results. We conclude by demonstrating how stabilizing neural ODEs provide a natural extension for use in reduced-order modeling by projecting the dynamics onto the eigenvectors of the learned linear term.
Band Alignment in Black Phosphorus/Transition Metal Dichalcogenide Heterolayers: Impact of Charge Redistribution, Electric Field, Strain and Layer Engineering
Creators: name: Navlakha, Nupur
name: Jadaun, Priyamvada
name: Register, Leonard F.
name: Banerjee, Sanjay K.
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: The objective of this work is to study the effects of charge redistribution, applied layer-normal electric fields, applied strain, and layer engineering on the band alignment of Black Phosphorus (BP)/Molybdenum disulphide (MoS2) heterostructure through Density Functional Theory (DFT) simulations. Black phosphorus works as a p-type material with high mobility, mechanical flexibility, and sensitivity to number of layers. Combining it with the more electronegative material, MoS2 results in strong carrier confinement and a Type II heterostructure. Charge redistribution among the layers shifts the band alignment expected from the Electron Affinity Rule. Applied external fields, strain and multiple BP layers provide band-alignment tunability within the Type II range and/or, transition to Type I and Type III heterostructures. The tunability in BP/MoS2 heterostructure may be useful as tunnel field effect transistors, rectifier diodes with tunable barrier height, reconfigurable FETs, and electro-optical modulators. Furthermore, considering heterostructures of monolayer BP with other monolayer Transitional Metal Dichalcogenides (TMD) suggests the ability to achieve different band alignment types. In our simulations, a Type I alignment is found with Tungsten diselenide (WSe2), Molybdenum diselenide (MoSe2), and Tungsten disulphide (WS2), and a Type III for Hafnium disulphide (HfS2) and Hafnium diselenide (HfSe2).
The effect of chemical composition on liquefaction characteristics of Australian coals
Creators: name: Redlich, Peter Joseph.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Design, fabrication, and tuning of a THz-driven electron gun
Creators: name: Lewis, Samantha M.
name: Merrick, Julian
name: Othman, Mohamed A. K.
name: Haase, Andrew
name: Tantawi, Sami
name: Nanni, Emilio A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: We present the design, fabrication, and low power testing of a THz-driven field emission electron gun. The two cell standing-wave gun is designed to be powered by a 110 GHz gyrotron and produce 360 keV electrons with 500 kW of input power. Several gun structures were fabricated using a high precision diamond turned mandrel and copper electroforming. The field emission source is a copper tip with a 50 $μ$m radius inserted halfway into first cell. The frequencies of the cavity resonances were mechanically tuned using azimuthal compression. This work presents electromagnetic and particle simulations of the design and cold test measurements of the fabricated structures.
description: 8 pages, 13 figures
Nature of the MHD and kinetic scale turbulence in the magnetosheath of Saturn: Cassini observations
Creators: name: Hadid, L. Z.
name: Sahraoui, F.
name: Kiyani, K. H.
name: Retinò, A.
name: Modolo, R.
name: Canu, P.
name: Masters, A.
name: Dougherty, M. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Space Physics (physics.space-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Low frequency turbulence in Saturn's magnetosheath is investigated using in-situ measurements of the Cassini spacecraft. Focus is put on the magnetic energy spectra computed in the frequency range $\sim[10^{-4}, 1]$Hz. A set of 42 time intervals in the magnetosheath were analyzed and three main results that contrast with known features of solar wind turbulence are reported: 1) The magnetic energy spectra showed a $\sim f^{-1}$ scaling at MHD scales followed by an $\sim f^{-2.6}$ scaling at the sub-ion scales without forming the so-called inertial range; 2) The magnetic compressibility and the cross-correlation between the parallel component of the magnetic field and density fluctuations $ C(δn,δB_{||}) $ indicates the dominance of the compressible magnetosonic slow-like modes at MHD scales rather than the Alfvén mode; 3) Higher order statistics revealed a monofractal (resp. multifractal) behaviour of the turbulent flow downstream of a quasi-perpendicular (resp. quasi-parallel) shock at the sub-ion scales. Implications of these results on theoretical modeling of space plasma turbulence are discussed.
Discovery and origin of the radio emission from the multiple stellar system KQVel
Creators: name: Leto, P.
name: Oskinova, L. M.
name: Buemi, C. S.
name: Shultz, M. E.
name: Cavallaro, F.
name: Trigilio, C.
name: Umana, G.
name: Fossati, L.
name: Pillitteri, I.
name: Krticka, J.
name: Ignace, R.
name: Bordiu, C.
name: Bufano, F.
name: Catanzaro, G.
name: Cerrigone, L.
name: Giarrusso, M.
name: Ingallinera, A.
name: Loru, S.
name: Owocki, S. P.
name: Postnov, K. A.
name: Riggi, S.
name: Robrade, J.
name: Leone, F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: KQVel is a binary system composed of a slowly rotating magnetic Ap star with a companion of unknown nature. In this paper, we report the detection of its radio emission. We conducted a multi-frequency radio campaign using the ATCA interferometer (band-names: 16cm, 4cm, and 15mm). The target was detected in all bands. The most obvious explanation for the radio emission is that it originates in the magnetosphere of the Ap star, but this is shown unfeasible. The known stellar parameters of the Ap star enable us to exploit the scaling relationship for non-thermal gyro-synchrotron emission from early-type magnetic stars. This is a general relation demonstrating how radio emission from stars with centrifugal magnetospheres is supported by rotation. Using KQVel's parameters the predicted radio luminosity is more than five orders of magnitudes lower than the measured one. The extremely long rotation period rules out the Ap star as the source of the observed radio emission. Other possible explanations for the radio emission from KQVel, involving its unknown companion, have been explored. A scenario that matches the observed features (i.e. radio luminosity and spectrum, correlation to X-rays) is a hierarchical stellar system, where the possible companion of the magnetic star is a close binary (possibly of RSCVn type) with at least one magnetically active late-type star. To be compatible with the total mass of the system, the last scenario places strong constraints on the orbital inclination of the KQVel stellar system.
description: Accepted to MNRAS; 16 pages, 9 figures
Brecht, Martin (Hrsg.);de Boor, Friedrich; Deppermann, Klaus; Lehmann, Hartmut; Lindt, Andreas; Wallmann, Johannes: Pietismus und Neuzeit
Creators: name: Beyreuther, Erich
Publisher: name: Unitas Fratrum
Year: 1970

description: Unitas Fratrum, Bd. 18 (1986): Unitas Fratrum, Band 18
Constraining a halo model for cosmological neutral hydrogen
Creators: name: Padmanabhan, Hamsa
name: Refregier, Alexandre
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We describe a combined halo model to constrain the distribution of neutral hydrogen (HI) in the post-reionization universe. We combine constraints from the various probes of HI at different redshifts: the low-redshift 21-cm emission line surveys, intensity mapping experiments at intermediate redshifts, and the Damped Lyman-Alpha (DLA) observations at higher redshifts. We use a Markov Chain Monte Carlo (MCMC) approach to combine the observations and place constraints on the free parameters in the model. Our best-fit model involves a relation between neutral hydrogen mass $M_{\rm HI}$ and halo mass $M$ with a non-unit slope, and an upper and a lower cutoff. We find that the model fits all the observables but leads to an underprediction of the bias parameter of DLAs at $z \sim 2.3$. We also find indications of a possible tension between the HI column density distribution and the mass function of HI-selected galaxies at $z\sim 0$. We provide the central values of the parameters of the best-fit model so derived. We also provide a fitting form for the derived evolution of the concentration parameter of HI in dark matter haloes, and discuss the implications for the redshift evolution of the HI-halo mass relation.
description: 10 pages, 9 figures, 2 tables; version accepted for publication in MNRAS
Exceptional fracture toughness of CrCoNi-based medium- and high-entropy alloys close to liquid helium temperatures
Creators: name: Liu, Dong
name: Yu, Qin
name: Kabra, Saurabh
name: Jiang, Ming
name: Forna-Kreutzer, Paul
name: Zhang, Ruopeng
name: Payne, Madelyn
name: Walsh, Flynn
name: Gludovatz, Bernd
name: Asta, Mark
name: Minor, Andrew M.
name: George, Easo P.
name: Ritchie, Robert O.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Medium- and high-entropy alloys based on the CrCoNi-system have been shown to display outstanding strength, tensile ductility and fracture toughness (damage-tolerance properties), especially at cryogenic temperatures. Here we examine the JIc and (back-calculated) KJIc fracture toughness values of the face-centered cubic, equiatomic CrCoNi and CrMnFeCoNi alloys at 20 K. At flow stress values of ~1.5 GPa, crack-initiation KJIc toughnesses were found to be exceptionally high, respectively 235 and 415 MPa(square-root)m for CrMnFeCoNi and CrCoNi, with the latter displaying a crack-growth toughness Kss exceeding 540 MPa(square-root)m after 2.25 mm of stable cracking, which to our knowledge is the highest such value ever reported. Characterization of the crack-tip regions in CrCoNi by scanning electron and transmission electron microscopy reveal deformation structures at 20 K that are quite distinct from those at higher temperatures and involve heterogeneous nucleation, but restricted growth, of stacking faults and fine nano-twins, together with transformation to the hexagonal closed-packed phase. The coherent interfaces of these features can promote both the arrest and transmission of dislocations to generate respectively strength and ductility which strongly contributes to sustained strain hardening. Indeed, we believe that these nominally single-phase, concentrated solid-solution alloys develop their fracture resistance through a progressive synergy of deformation mechanisms, including dislocation glide, stacking-fault formation, nano-twinning and eventually in situ phase transformation, all of which serve to extend continuous strain hardening which simultaneously elevates strength and ductility (by delaying plastic instability), leading to truly exceptional resistance to fracture.
description: 31 pages, 10 figures, including Supplementary Information
The food and feeding ecology of the little penguin (Eudyptula minor) at Phillip Island, Victoria, Australia
Creators: name: Montague, T. L. .
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Strain fields and defects in silicon wafers induced by nanoindentation studied by X-ray microdiffraction imaging
Creators: name: Li, Zhi Juan
Publisher: name: Universität Freiburg
Year: 2011

description: Damage in silicon wafers from handling and processing is a severe problem in device production. A high resolution X-ray method is developed to characterize and to quantify the damage in the crystal. For this reason, a series of silicon (001) wafers treated with various loads of nanoindentation (from 200 mN to 2 N) were investigated by the X-ray Micro-diffraction Imaging method. By combining single crystal diffraction and diffuse scattering with high resolution imaging, detailed information on micro-structural defects and local strain field in the indented silicon wafers were obtained. The integrated intensity, width and position shift, diffuse scattering components were extracted from the measured diffraction profile in the image data, and spatially resolving mapping of these parameters were presented. The strain field and defect distribution, as revealed by the two or three dimensional maps, obtained at 004 and 220 diffractions, are dependent on the indentation load, crystal anisotropy and annealing treatment. The indentations generate strain fields extending to a domain much larger and deeper than the plastically deformed zones around the indenter impression. The plastic deformation and extensive compressive, tensile fields produce also diffuse scattering and from which defects can be characterized. The analysis of diffuse scattering indicated an elastic character for the strain field.