cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Energy-momentum tensors in linearized Einstein's theory and massive gravity: The question of uniqueness
Creators: name: Bičák, Jiří
name: Schmidt, Josef
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The question of the uniqueness of energy-momentum tensors in the linearized general relativity and in the linear massive gravity is analyzed without using variational techniques. We start from a natural ansatz for the form of the tensor (for example, that it is a linear combination of the terms quadratic in the first derivatives), and require it to be conserved as a consequence of field equations. In the case of the linear gravity in a general gauge we find a four-parametric system of conserved second-rank tensors which contains a unique symmetric tensor. This turns out to be the linearized Landau-Lifshitz pseudotensor employed often in full general relativity. We elucidate the relation of the four-parametric system to the expression proposed recently by Butcher et al. "on physical grounds" in harmonic gauge, and we show that the results coincide in the case of high-frequency waves in vacuum after a suitable averaging. In the massive gravity we show how one can arrive at the expression which coincides with the "generalized linear symmetric Landau-Lifshitz" tensor. However, there exists another uniquely given simpler symmetric tensor which can be obtained by adding the divergence of a suitable superpotential to the canonical energy-momentum tensor following from the Fierz-Pauli action. In contrast to the symmetric tensor derived by the Belinfante procedure which involves the second derivatives of the field variables, this expression contains only the field and its first derivatives. It is simpler than the generalized Landau-Lifshitz tensor but both yield the same total quantities since they differ by the divergence of a superpotential. We also discuss the role of the gauge conditions in the proofs of the uniqueness. In the Appendix, the use of the symbolic tensor manipulation software Cadabra is briefly described.
description: 13 pages
Exclusive production of a pair of high transverse momentum photons in pion-nucleon collisions for extracting generalized parton distributions
Creators: name: Qiu, Jian-Wei
name: Yu, Zhite
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We show that exclusive production of a pair of high transverse momentum photons in pion-nucleon collisions can be systematically studied in QCD factorization approach if the photon's transverse momentum $q_T$ with respect to the colliding pion is much greater than $Λ_{\rm QCD}$. We demonstrate that the leading power non-perturbative contributions to the scattering amplitudes of this exclusive process are process-independent and can be systematically factorized into universal pion's distribution amplitudes (DAs) and nucleon's generalized parton distributions (GPDs), which are convoluted with corresponding infrared safe and perturbatively calculable short-distance hard parts. The correction to this factorized expression is suppressed by powers of $1/q_T$. We demonstrate quantitatively that this new type of exclusive processes is not only complementary to existing processes for extracting GPDs, but also capable of providing an enhanced sensitivity to the dependence of both DAs and GPDs on the active parton's momentum fraction $x$. We also introduce additional, but the same type of exclusive observables to enhance our capability to explore GPDs, in particular, their $x$-dependence.
description: 60 pages, 28 figures; extended reference and some discussions, with the main results unchanged
Modulation of activin action in the prostate
Creators: name: Mellor., Sally
Publisher: name: Monash University
Year: 2021

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.
Plasmoids in relativistic reconnection, from birth to adulthood: first they grow, then they go
Creators: name: Sironi, L.
name: Giannios, D.
name: Petropoulou, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Blobs, or quasi-spherical emission regions containing relativistic particles and magnetic fields, are often assumed ad hoc in emission models of relativistic astrophysical jets, yet their physical origin is still not well understood. Here, we employ a suite of large-scale two-dimensional particle-in-cell simulations in electron-positron plasmas to demonstrate that relativistic magnetic reconnection can naturally account for the formation of quasi-spherical plasmoids filled with high-energy particles and magnetic fields. Our simulations extend to unprecedentedly long temporal and spatial scales, so we can capture the asymptotic physics independently of the initial setup. We characterize the properties of the plasmoids that are continuously generated as a self-consistent by-product of the reconnection process: they are in rough energy equipartition between particles and magnetic fields; the upper energy cutoff of the plasmoid particle spectrum is proportional to the plasmoid width w, corresponding to a Larmor radius ~0.2 w; the plasmoids grow in size at ~0.1 of the speed of light, with most of the growth happening while they are still non-relativistic (first they grow); their growth is suppressed once they get accelerated to relativistic speeds by the field line tension, up to the Alfven speed (then they go). The largest plasmoids, whose typical recurrence interval is ~2.5 L/c, reach a characteristic size w ~ 0.2 L independently of the system length L, they have nearly isotropic particle distributions and they contain the highest energy particles, whose Larmor radius is ~0.03 L. The latter can be regarded as the Hillas criterion for relativistic reconnection. We briefly discuss the implications of our results for the high-energy emission from relativistic jets and pulsar winds.
description: 27 pages, 14 figures, 2 appendices, submitted to MNRAS
title: Extending and Evaluating CSPOT Type Constructors
Creators: name: Brand, Lukas
Publisher: name: Hochschule für Angewandte Wissenschaften Landshut
Year: 2023

description: Serverless computing gained popularity as a programming model for cloud applications. It promises the elimination of operational tasks and infrastructure management, fast development times due to broad language support with simple APIs along with several other advantages such as cost optimization, high availability, and automatic scaling. Serverless runtimes offer an event-driven, decoupled, and modular architecture. "Internet of Things" (IoT) applications profit from the serverless programming model in that they are event-driven out-of-the-box and thus can be easily implemented. However, current serverless offerings lack support for distributed computation and unified abstractions from "end-to-end", i.e. the same programming model for IoT devices, edge devices as well as cloud data centers to implement IoT applications. CSPOT, a serverless platform of things is an ongoing research project that promises to solve the current limitations of existing IoT serverless solutions. This thesis focuses on a type and operation system that is part of Laminar, a runtime system built on top of CSPOT. Laminar provides a functional dataflow program representation for building distributed IoT applications. It improves the development experience for CSPOT applications and establishes the foundation for further programming abstractions and language implementations.
Test of the $X(3872)$ Structure in Antiproton-Nucleus Collisions
Creators: name: Larionov, Alexei
name: Strikman, Mark
name: Bleicher, Marcus
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The present day experimental data on the $X(3872)$ decays do not allow to make clear conclusions on the dominating structure of this state. We discuss here an alternative way to study its structure by means of the two-step $\bar D^*$ (or $D$) production in $\bar p A$ reactions. If this process is mediated by $X(3872)$, the characteristic narrow peaks of the $\bar D^*$ (or $D$) distributions in the light cone momentum fraction at small transverse momenta will appear. This would unambiguously signal the $D \bar D^*$ + c.c. molecular composition of the $X(3872)$ state.
description: Proceedings of the XVI International Conference on Hadron Spectroscopy, 13-18.09.2015, Newport News, USA
Ανάκτηση βλαστικών κυττάρων με μεθόδους μηχανικής μάθησης
Creators: name: Μαδίκας, Θωμάς Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2022
Subjects: Βλαστικά κύτταρα
Ανάκτηση
Μηχανική Μάθηση
Stem cells
Recovery
Machine Learning

description: Η τεχνολογία των βλαστικών κυττάρων αποτελεί μία τεχνολογία αιχμής στη σύγχρονη εποχή. Όλο και περισσότερα δεδομένα προκύπτουν και συλλέγονται ως προς τις ιδιότητες και τους μηχανισμούς αυτών των πολύπλοκων κυτταρικών δομών, με τελικό στόχο την διαφορετική προσέγγιση ασθενειών που μέχρι σήμερα ήταν δύσκολο εώς αδύνατο να θεραπευθούν με τις κλασσικές μεθόδους θεραπείας. Από την άλλη η Mηχανική Mάθηση, ένας ραγδαία αυξανόμενος χώρος της Τεχνητής Νοημοσύνης, τα τελευταία χρόνια, ενώνεται με τις βιολογικές επιστήμες με σκοπό την ανάλυση των χαοτικών δεδομένων στις βάσεις δεδομένων και την εξαγωγή χρήσιμων συμπερασμάτων ή την κατασκευή πρότυπων μοντέλων πρόβλεψης. Στη παρούσα μελέτη αξιοποιήθηκε η τεχνολογία της μηχανικής μάθησης σε έναν ικανοποιητικό αριθμό δεδομένων για την κατασκευή μοντέλων πρόβλεψης σχετικά με την ανάκτηση βλαστικών κυττάρων.
description: Stem cell technοlοgy is a cutting-edge technοlοgy in mοdern times. Mοre and mοre data are emerging and being cοllected regarding the prοperties and mechanisms οf these cοmplex cellular structures. The main purpοse οf this biοtechnοlοgy is tο apprοach diseases in a different way than the cοnventiοnal methοds. Οn the οther hand, Machine Learning, a rapidly grοwing field οf Artificial Intelligence, has been integrated with the biοlοgical sciences in οrder tο analyze chaοtic data in biοlοgical databases and tο cοme up with useful cοnclusiοns οr tο build predictiοn mοdels. In the present study, the technοlοgy οf Machine Learning was utilized in a sufficient number οf data fοr the cοnstructiοn οf predictiοn mοdels regarding the recοvery οf these stem cells.
Electric field control of deterministic current-induced magnetization switching in a hybrid ferromagnetic/ferroelectric structure
Creators: name: Cai, Kaiming
name: Yang, Meiyin
name: Ju, Hailang
name: Edmonds, Kevin William
name: Li, Baohe
name: Sheng, Yu
name: Zhang, Bao
name: Zhang, Nan
name: Liu, Shuai
name: Ji, Yang
name: Zheng, Houzhi
name: Wang, Kaiyou
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: All-electrical and programmable manipulations of ferromagnetic bits are highly pursued for the aim of high integration and low energy consumption in modern information technology. Methods based on the spin-orbit torque switching in heavy metal/ferromagnet structures have been proposed with magnetic field, and recently are heading toward deterministic switching without external magnetic field. Here we demonstrate that an in-plane effective magnetic field can be induced by an electric field without breaking the symmetry of the structure of the thin film, and realize the deterministic magnetization switching in a hybrid ferromagnetic/ferroelectric structure with Pt/Co/Ni/Co/Pt layers on PMN-PT substrate. The effective magnetic field can be reversed by changing the direction of the applied electric field on the PMN-PT substrate, which fully replaces the controllability function of the external magnetic field. The electric field is found to generate an additional spin-orbit torque on the CoNiCo magnets, which is confirmed by macrospin calculations.
description: 15 pages, 4 figures
The specific heat of astro-materials: Review of theoretical concepts, materials and techniques
Creators: name: Biele, Jens
name: Grott, Matthias
name: Zolensky, Michael E.
name: Benisek, Artur
name: Dachs, Edgar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Classical Physics (physics.class-ph)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We provide detailed background, theoretical and practical, on the specific heat cp of minerals and mixtures thereof, 'astro-materials', as well as background information on common minerals and other relevant solid substances found on the surfaces of solar system bodies. Furthermore, we demonstrate how to use specific heat and composition data for lunar samples and meteorites as well as a new database of endmember mineral heat capacities (the result of an extensive literature review) to construct reference models for the isobaric specific heat cP as a function of temperature for common solar system materials. Using a (generally linear) mixing model for the specific heat of minerals allows extrapolation of the available data to very low and very high temperatures, such that models cover the temperature range between 10 and 1000 K at least (and pressures from zero up to several kbars). We describe a procedure to estimate cp(T) for virtually any solid solar system material with a known mineral composition, e.g., model specific heat as a function of temperature for a number of typical meteorite classes with known mineralogical compositions. We present, as examples, the cp(T) curves of a number of well-described laboratory regolith analogues, as well as for planetary ices and 'tholins' in the outer solar system. Part II will review and present the heat capacity database for minerals and compounds and part III is going to cover applications, standard reference compositions, cp(T) curves and a comparison with new and literature experimental data.
description: submitted to Special Issue for International Journal of Thermophysics 'Thermophysics of Advanced Spacecraft Materials and Extraterrestrial Samples' Part II to be submitted still in 2022
A proposed network of Gamma-ray Burst detectors on the Global Navigation Satellite System Galileo G2
Creators: name: Greiner, J.
name: Hugentobler, U.
name: Burgess, J. M.
name: Berlato, F.
name: Rott, M.
name: Tsvetkova, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The accurate localization of gamma-ray bursts remains a crucial task. While historically, improved localization have led to the discovery of afterglow emission and the realization of their cosmological distribution via redshift measurements, a more recent requirement comes with the potential of studying the kilonovae of neutron star mergers. Gravitational wave detectors are expected to provide locations to not better than 10 square degrees over the next decade. With their increasing horizon for merger detections also the intensity of the gamma-ray and kilonova emission drops, making their identification in large error boxes a challenge. Thus, a localization via the gamma-ray emission seems to be the best chance to mitigate this problem. Here we propose to equip some of the second generation Galileo satellites with dedicated GRB detectors. This saves costs for launches and satellites for a dedicated GRB network, the large orbital radius is beneficial for triangulation, and perfect positional and timing accuracy come for free. We present simulations of the triangulation accuracy, demonstrating that short GRBs as faint as GRB 170817A can be localized to 1 degree radius (1 sigma).
description: A&A (accepted); 25 pages, 108 figures
The control of prostaglandin synthesis during the oestrous cycle and throughout pregnancy in sheep
Creators: name: Meier., Susanne
Publisher: name: Monash University
Year: 2021

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.
Tucana B: A Potentially Isolated and Quenched Ultra-faint Dwarf Galaxy at D$\approx$1.4 Mpc
Creators: name: Sand, D. J.
name: Mutlu-Pakdil, B.
name: Jones, M. G.
name: Karunakaran, A.
name: Wang, F.
name: Yang, J.
name: Chiti, A.
name: Bennet, P.
name: Crnojević, D.
name: Spekkens, K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the discovery of Tucana B, an isolated ultra-faint dwarf galaxy at a distance of D=1.4 Mpc. Tucana B was found during a search for ultra-faint satellite companions to the known dwarfs in the outskirts of the Local Group, although its sky position and distance indicate the nearest galaxy to be $\sim$500 kpc distant. Deep ground-based imaging resolves Tucana B into stars, and it displays a sparse red giant branch consistent with an old, metal poor stellar population analogous to that seen in the ultra-faint dwarf galaxies of the Milky Way, albeit at fainter apparent magnitudes. Tucana B has a half-light radius of 80$\pm$40 pc, and an absolute magnitude of $M_V$=$-$6.9$^{+0.5}_{-0.6}$ mag ($L_V$=$(5^{+4}_{-2})\times$10$^4$ $L_{\odot}$), which is again comparable to the Milky Way's ultra-faint satellites. There is no evidence for a population of young stars, either in the optical color magnitude diagram or in GALEX archival ultraviolet imaging, with the GALEX data indicating $\log (\mathrm{SFR_{NUV}/M_\odot \, yr^{-1}}) < -5.4$ for star formation on $\lesssim$100 Myr time scales. Given its isolation and physical properties, Tucana B may be a definitive example of an ultra-faint dwarf that has been quenched by reionization, providing strong confirmation of a key driver of galaxy formation and evolution at the lowest mass scales. It also signals a new era of ultra-faint dwarf galaxy discovery at the extreme edges of the Local Group.
description: 11 pages, 4 figures, ApJ Letters accepted
Alternative Authentication in the Wild
Creators: name: Maguire, Joseph
name: Renaud, Karen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Alphanumeric authentication routinely fails to regulate access to resources with the required stringency, primarily due to usability issues. Initial deployment did not reveal the problems of passwords, deep and profound flaws only emerged once passwords were deployed in the wild. The need for a replacement is widely acknowledged yet despite over a decade of research into knowledge-based alternatives, few, if any, have been adopted by industry. Alternatives are unconvincing for three primary reasons. The first is that alternatives are rarely investigated beyond the initial proposal, with only the results from a constrained lab test provided to convince adopters of their viability. The second is that alternatives are seldom tested realistically where the authenticator mediates access to something of value. The third is that the testing rarely varies the device or context beyond that initially targeted. In the modern world different devices are used across a variety of contexts. What works well in one context may easily fail in another. Consequently, the contribution of this paper is an "in the wild" evaluation of an alternative authentication mechanism that had demonstrated promise in its lab evaluation. In the field test the mechanism was deployed to actual users to regulate access to an application in a context beyond that initially proposed. The performance of the mechanism is reported and discussed. We conclude by reflecting on the value of field evaluations of alternative authentication mechanisms.
Effects of the environment and feedback physics on the initial mass function of stars in the STARFORGE simulations
Creators: name: Guszejnov, Dávid
name: Grudić, Michael Y.
name: Offner, Stella S. R.
name: Faucher-Giguère, Claude-André
name: Hopkins, Philip F.
name: Rosen, Anna L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: One of the key mysteries of star formation is the origin of the stellar initial mass function (IMF). The IMF is observed to be nearly universal in the Milky Way and its satellites, and significant variations are only inferred in extreme environments, such as the cores of massive elliptical galaxies. In this work we present simulations from the STARFORGE project that are the first cloud-scale RMHD simulations that follow individual stars and include all relevant physical processes. The simulations include detailed gas thermodynamics, as well as stellar feedback in the form of protostellar jets, stellar radiation, winds and supernovae. In this work we focus on how stellar radiation, winds and supernovae impact star-forming clouds. Radiative feedback plays a major role in quenching star formation and disrupting the cloud, however the IMF peak is predominantly set by protostellar jet physics. We find the effect of stellar winds is minor, and supernovae occur too late}to affect the IMF or quench star formation. We also investigate the effects of initial conditions on the IMF. The IMF is insensitive to the initial turbulence, cloud mass and cloud surface density, even though these parameters significantly shape the star formation history of the cloud, including the final star formation efficiency. The characteristic stellar mass depends weakly on metallicity and the interstellar radiation field. Finally, while turbulent driving and the level of magnetization strongly influences the star formation history, they only influence the high-mass slope of the IMF.
description: 24 pages, 20 figures, extra figures at https://github.com/guszejnovdavid/STARFORGE_IMF_paper_extra_plots
Conceptions of Space in Global History –
Creators: name: Sachsenmaier, Dominic
Publisher: name: Leipziger Universitätsverlag
Year: 2010

description: Raumkonzepte in der Globalgeschichte – Ein kurzer Überblick zur Forschung in den USA und in China Der Aufsatz betrachtet neuere Entwicklungen in der Diskussion um Welt- und Globalgeschichte und verändert dabei gegenüber vielen westlichen Überblicken die Perspektive, indem er neben amerikanischen auch chinesische Beiträge zu dieser Debatte näher analysiert und zum Ausgangspunkt einer Erörterung der zugrunde liegenden Raumkonzete macht, die nicht nur den historischen Gegenstand sondern auch die historiografische Praxis in einem neuen Licht erscheinen lassen.
description: Comparativ, Vol 20 No 6 (2010): Die Verwandlung der Weltgeschichtsschreibung
Mixture of entangled pure states with maximally mixed one-qudit reduced density matrices
Creators: name: Flores, Marvin M.
name: Galapon, Eric A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the conditions when mixtures of entangled pure states with maximally mixed one-qudit reduced density matrices remain entangled. We found that the resulting mixed state remains entangled when the number of entangled pure states to be mixed is less than or equal to the dimension of the pure states. For the latter case of mixing a number of pure states equal to their dimension, we found that the mixed state is entangled provided that the entangled pure states to be mixed are not equally weighted. We also found that one can restrict the set of pure states that one can mix from in order to ensure that the resulting mixed state is genuinely entangled.
D3.10 Sustainable certification, conformity criteria and evaluation
Creators: name: Yeon Koo, Kwi
name: Tannum, Marius
Publisher: name: Zenodo
Year: 2023
Subjects: Certification
Test
Accreditation
ITSEF
Standarization

description: The certification and evaluation scheme of equipment for SAR and disaster response can be complicated, time consume and even hindering the development and adaption of new solutions. This deliverable will give an overview of the standards and certification scheme for SAR and emergency response related products and systems.
Regulation of cell fate decisions in the postnatal rodent testis
Creators: name: Meehan., Terri
Publisher: name: Monash University
Year: 2021

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 of tunable GHz-frequency optomechanical crystal resonators
Creators: name: Pfeifer, Hannes
name: Paraiso, Taofiq
name: Zang, Leyun
name: Painter, Oskar
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a silicon optomechanical nanobeam design with a dynamically tunable acoustic mode at 10.2 GHz. The resonance frequency can be shifted by 90 kHz/V^2 with an on-chip capacitor that was optimized to exert forces up to 1 $μ$N at 10 V operation voltage. Optical resonance frequencies around 190 THz with Q factors up to $2.2 \times 10^6$ place the structure in the well-resolved sideband regime with vacuum optomechanical coupling rates up to $g_0/2π= 353$ kHz. Tuning can be used, for instance, to overcome variation in the device-to-device acoustic resonance frequency due to fabrication errors, paving the way for optomechanical circuits consisting of arrays of optomechanical cavities.
description: 13 pages, 5 figures
Black Hole Phase Transitions and the Chemical Potential
Creators: name: Maity, Reevu
name: Roy, Pratim
name: Sarkar, Tapobrata
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In the context of extended phase space thermodynamics and the AdS-CFT correspondence, we consider the chemical potential ($μ$) dual to the number of colours ($N$) of the boundary gauge theory, in the grand canonical ensemble. By appropriately defining $μ$ via densities of thermodynamic quantities, we show that it changes sign precisely at the Hawking-Page transition for AdS-Schwarzschild and RN-AdS black holes in five dimensions, signalling the onset of quantum effects at the transition point. Such behaviour is absent for non-rotating black holes in four dimensions. For Kerr-AdS black holes in four and five dimensions, our analysis points to the fact that $μ$ can change sign in the stable black hole region, i.e above the Hawking-Page transition temperature, for a range of angular frequencies. We also analyse AdS black holes in five dimensional Gauss-Bonnet gravity, and find similar features for $μ$ as in the Kerr-AdS case.
description: 1 + 14 Pages, LaTeX, 6 .eps figures
Band Gaps in Jagged and Straight Graphene Nanoribbons Tunable by an External Electric Field
Creators: name: Saroka, V. A.
name: Batrakov, K. G.
name: Demin, V. A.
name: Chernozatonskii, L. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Band gap control by an external field is useful in various optical, infrared and THz applications. However, widely tunable band gaps are still not practical due to variety of reasons. Using the orthogonal tight-binding method for $π$-electrons, we have investigated the effect of the external electric field on a subclass of monolayer chevron-type graphene nanoribbons that can be referred to as jagged graphene nanoribbons. A classification of such ribbons was proposed and band gaps for applied fields up to the SiO$_2$ breakdown strength ($1$ V/nm) were calculated. According to the tight-binding model, band gap opening (or closing) takes place for some type of jagged graphene nanoribbons in the external electric field that lays in the plane of the structure and perpendicular to its longitudinal axis. Tunability of the band gap up to $0.6$ eV is attainable for narrow ribbons. In the case of jagged ribbons with armchair edges larger jags forming a chevron pattern of the ribbon enhance the controllability of the band gap. For jagged ribbons with zigzag and armchair edges regions of linear and quadratic dependence of the band gap on the external electric field can be found that are useful in devices with controllable modulation of the band gap.
description: 15 pages, 12 pdf figures
Accounting for stellar activity signals in radial-velocity data by using Change Point Detection techniques
Creators: name: Simola, U.
name: Bonfanti, A.
name: Dumusque, X.
name: Cisewski-Kehe, J.
name: Kaski, S.
name: Corander, J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Applications (stat.AP)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Active regions on the photosphere of a star have been the major obstacle for detecting Earth-like exoplanets using the radial velocity (RV) method. A commonly employed solution for addressing stellar activity is to assume a linear relationship between the RV observations and the activity indicators along the entire time series, and then remove the estimated contribution of activity from the variation in RV data (overall correction method). However, since active regions evolve on the photosphere over time, correlations between the RV observations and the activity indicators will correspondingly be anisotropic. We present an approach that recognizes the RV locations where the correlations between the RV and the activity indicators significantly change in order to better account for variations in RV caused by stellar activity. The proposed approach uses a general family of statistical breakpoint methods, often referred to as change point detection (CPD) algorithms; several implementations of which are available in R and python. A thorough comparison is made between the breakpoint-based approach and the overall correction method. To ensure wide representativity, we use measurements from real stars that have different levels of stellar activity and whose spectra have different signal-to-noise ratios. When the corrections for stellar activity are applied separately to each temporal segment identified by the breakpoint method, the corresponding residuals in the RV time series are typically much smaller than those obtained by the overall correction method. Consequently, the generalized Lomb-Scargle periodogram contains a smaller number of peaks caused by active regions. The CPD algorithm is particularly effective when focusing on active stars with long time series, such as alpha Cen B.
description: 31 pages, 18 Figures
Learning Long-Horizon Robot Exploration Strategies for Multi-Object Search in Continuous Action Spaces
Creators: name: Schmalstieg, Fabian
name: Honerkamp, Daniel
name: Welschehold, Tim
name: Valada, Abhinav
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Recent advances in vision-based navigation and exploration have shown impressive capabilities in photorealistic indoor environments. However, these methods still struggle with long-horizon tasks and require large amounts of data to generalize to unseen environments. In this work, we present a novel reinforcement learning approach for multi-object search that combines short-term and long-term reasoning in a single model while avoiding the complexities arising from hierarchical structures. In contrast to existing multi-object search methods that act in granular discrete action spaces, our approach achieves exceptional performance in continuous action spaces. We perform extensive experiments and show that it generalizes to unseen apartment environments with limited data. Furthermore, we demonstrate zero-shot transfer of the learned policies to an office environment in real world experiments.
Implications of the Zero 1-3 Flavour Mixing Hypothesis: Predictions for $θ_{23}^\mathrm{PMNS}$ and $δ^\mathrm{PMNS}$
Creators: name: Antusch, Stefan
name: Hinze, Kevin
name: Saad, Shaikh
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We revisit mixing sum rule relations in the lepton and quark sectors under the assumption that the 1-3 elements of the flavour mixing matrices ($V^u_L,V^d_L,V^e_L,V^ν_L$) are zero in the flavour basis. We consider the exact relations resulting from the validity of this "zero 1-3 flavour mixing hypothesis" and analyse their implications based on the current experimental data, including effects from RG running. In particular, we analyse how the existing precise measurement of $θ_{13}^\mathrm{PMNS}$ allows to derive predictions for $θ_{23}^\mathrm{PMNS}$ in models with constrained $θ_{12}^\mathrm{e}$. As examples, we calculate the predictions for $θ_{23}^\mathrm{PMNS}$ which arise in classes of Pati-Salam models and SU(5) GUTs that relate $θ_{12}^\mathrm{e}$ to $θ_{12}^\mathrm{d}$. We also derive a novel "lepton phase sum rule", valid under the additional assumption of small charged lepton mixing contributions. We furthermore point out that, in the context of GUT flavour models, the quark and lepton CP violating phases $δ^\mathrm{CKM}$ and $δ^\mathrm{PMNS}$ can both be predicted from a single imaginary element in the mass matrices.
description: 10 pages + references, 4 figures
Apparent minification in an imaging display
Creators: name: Meehan., James W. R.
Publisher: name: Monash University
Year: 2021

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.
Do we know what the temperature is?
Creators: name: Mares, Jiri J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Classical Physics (physics.class-ph)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: Temperature, the central concept of thermal physics, is one of the most frequently employed physical quantities in common practice. Even though the operative methods of the temperature measurement are described in detail in various practical instructions and textbooks, the rigorous treatment of this concept is almost lacking in the current literature. As a result, the answer to a simple question of "what the temperature is" is by no means trivial and unambiguous. There is especially an appreciable gap between the temperature as introduced in the frame of statistical theory and the only experimentally observable quantity related to this concept, phenomenological temperature. Just the logical and epistemological analysis of the present concept of phenomenological temperature is the kernel of the contribution.
description: 17 pages
Φορητή μάθηση και διερεύνηση δυνατοτήτων ανάπτυξης εφαρμογών γλωσσικής εκπαίδευσης στην Πρωτοβάθμια Εκπαίδευση
Creators: name: Στεργίου, Αδαμαντία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Φορητή Μάθηση
Εφαρμογές μάθησης
Σύστημα android
Mobile learning
Learning apps
Android system

description: Η προσπάθεια ένταξης της φορητής μάθησης (m-learning), στην ελληνική σχολική κοινότητα, με την αξιοποίηση των ποικίλων εκπαιδευτικών λογισμικών και ψηφιακών εφαρμογών που προσφέρονται μέσω των κινητών συσκευών έχει αρχίσει να δημιουργεί νέες προοπτικές εξέλιξης στην εκπαιδευτική διαδικασία, όπως την γνωρίζουμε. Οι δυνατότητα σχεδιασμού και αξιοποίησης μιας εκπαιδευτικής εφαρμογής που να στηρίζεται στο Αναλυτικό Πρόγραμμα ανα σχολική βαθμίδα και τάξη ξεδιπλώνεται ολοένα και περισσότερο από επαγγελματίες και ερασιτέχνες δημιουργούς εκπαιδευτικούς ή μη, με αποτέλεσμα να αναπτύσσεται ένα διευρυμένο δίκτυο μάθησης, το οποίο γίνεται προσβάσιμο σε όλους μέσω της φορητότητας των κινητών συσκευών και του λογισμικού Android, που η πλειοψηφία των χρηστών προτιμά. Συγκεκριμένα στην εν λόγω διπλωματική παρουσιάζεται ένα σύνολο εφαρμογών, στα πλαίσια της διδασκαλίας του μαθήματος της γλώσσας στην Πρωτοβάθμια Εκπαίδευση, καθώς και μια εφαρμογή υποστήριξης της διδασκαλίας της γλώσσας για την Ε Δημοτικού, που μπορεί να χρησιμοποιείται συνδυαστικά και με το περιβάλλον της αντίστοιχης σχολικής τάξης.
description: The effort of integration for mobile learning, in the Greek school community, by using the plethora of educational software and digital applications provided by the mobile devices has provided the opening for new development perspectives on the commonly known educational system. The capability of designing and utilizing an educational application based on the exact schedule by school ranking and class unfolds increasingly both by field professionals and amateur app creators, teachers or not. The direct outcome of this progress is an ever-growing educational network, which is becoming largely accessible by everyone through the mobile devices and the Android software, which is preferred among others by the majority of users. In this particular diploma a variety of applications is presented, focusing on teaching the subject of greek Language in the Primary Education Level as well as an application which supports Greek Language in the 5th class of elementary school, that can be used combinary with the corresponding class environment.
Information content of BP/RP spectra in Gaia DR3
Creators: name: Witten, Callum E. C.
name: Aguado, David S.
name: Sanders, Jason L.
name: Belokurov, Vasily
name: Evans, N. Wyn
name: Koposov, Sergey E.
name: Prieto, Carlos Allende
name: De Angeli, Francesca
name: Irwin, Mike 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: Gaia Data Release 3 has provided the astronomical community with the largest stellar spectroscopic survey to date ($>$ 220 million sources). The low resolution (R$\sim$50) blue photometer (BP) and red photometer (RP) spectra will allow for the estimation of stellar atmospheric parameters such as effective temperature, surface gravity and metallicity. We create mock Gaia BP/RP spectra and use Fisher information matrices to probe the resolution limit of stellar parameter measurements using BP/RP spectra. The best-case scenario uncertainties that this analysis provides are then used to produce a mock-observed stellar population in order to evaluate the false positive rate (FPR) of identifying extremely metal-poor (EMP) stars. We conclude that the community will be able to confidently identify metal-poor stars at magnitudes brighter than $G = 16$ using BP/RP spectra. At fainter magnitudes true detections will start to be overwhelmed by false positives. When adopting the commonly-used $G < 14$ limit for metal-poor star searches, we find a FPR for the low-metallicity regimes [Fe/H] $<$ -2, -2.5 and -3 of just 14$\%$, 33$\%$ and 56$\%$ respectively, offering the potential for significant improvements on previous targeting campaigns. Additionally, we explore the chemical sensitivity obtainable directly from BP/RP spectra for Carbon and $α$-elements. We find an absolute Carbon abundance uncertainty of $σ_{A(C)} < 1$ dex for Carbon-enriched metal-poor (CEMP) stars, indicating the potential to identify a CEMP stellar population for follow-up confirmation with higher resolution spectroscopy. Finally, we find that large uncertainties in $α$-element abundance measurements using BP/RP spectra means that efficiently obtaining these abundances will be challenging.
description: 12 pages, 9 figures, 1 table. Accepted for publication in MNRAS
A structure function analysis of VST-COSMOS AGN
Creators: name: De Cicco, D.
name: Bauer, F. E.
name: Paolillo, M.
name: Sánchez-Sáez, P.
name: Brandt, W. N.
name: Vagnetti, F.
name: Pignata, G.
name: Radovich, M.
name: Vaccari, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present our sixth work in a series dedicated to variability studies of active galactic nuclei (AGN) based on the survey of the COSMOS field by the VLT Survey Telescope (VST). Its 54 r-band visits over 3.3 yr and single-visit depth of 24.6 r-band mag make this dataset a valuable scaled-down version that can help forecast the performance of the Rubin Observatory Legacy Survey of Space and Time (LSST). This work is centered on the analysis of the structure function (SF) of VST-COSMOS AGN, investigating possible differences in its shape and slope related to how the AGN were selected, and explores possible connections between the ensemble variability of AGN and black-hole mass, accretion rate, bolometric luminosity, redshift, and obscuration of the source. Given its features, our dataset opens up the exploration of samples ~2 mag fainter than most of the literature to date. We identify several samples of AGN - 677 in total - obtained by a variety of selection techniques which partly overlap. Our analysis compares results for the various samples. We split each sample in two based on the median of the physical property of interest, and analyze differences in the shape and slope of the SF, and possible causes. While the shape of the SF does not change with depth, it is highly affected by the type of AGN (unobscured/obscured) included in the sample. Where a linear region can be identified, we find that the variability amplitude anticorrelates with accretion rate and bolometric luminosity, consistent with previous literature on the topic, while no dependence on black-hole mass emerges from this study. With its longer baseline and denser and more regular sampling, the LSST will allow an improved characterization of the SF and its dependencies on the mentioned physical properties over much larger AGN samples.
description: 18 pages, 10 figures; accepted for publication in A&A
Global History 2008–2010:
Creators: name: Middell, Matthias
name: Naumann, Katja
Publisher: name: Leipziger Universitätsverlag
Year: 2010

description: Global History 2008–2010: Empirical results, conceptual debates and new synthesis Since the late 1980s world and global history is on its current road to success within the discipline of history and has thus invited for comments, which have been made from different angles. This article continues these accompanying, reflective voiced by both limiting itself and enlarging the perspective. It is confined narrowly since it focuses on the developments of the last three years while it simultaneously takes into consideration a broader spectre of publication compared to other review articles. At its centre is the observation of a double trend: on the one hand a revival of large syntheses takes place, reflecting the interest of a wider audience global interpretation of the past as a preliminary to understand the present (and these including publications designed for teaching at the Bachelor and Master level); on the other hand in terms of research an “empirical turn” has asserted itself, more and more world and global history is published in specialized monographs. Added to that the article notices an increasing number of workshops, multilateral research groups and academic journals with an internationally composed authorship, which reminds that world and global history today is evolving as a transnational practice and in doing so is forerunner in the future course of the academic historiography and neighbouring discipline.
description: Comparativ, Vol 20 No 6 (2010): Die Verwandlung der Weltgeschichtsschreibung
Exceptional contours and band structure design in parity-time symmetric photonic crystals
Creators: name: Cerjan, Alexander
name: Raman, Aaswath
name: Fan, Shanhui
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We investigate the properties of multidimensional parity-time symmetric periodic systems whose non-Hermitian periodicity is an integer multiple of the underlying Hermitian system's periodicity. This creates a natural set of degeneracies which can undergo thresholdless $\mathcal{PT}$ transitions. We derive a $\mathbf{k} \cdot \mathbf{p}$ perturbation theory suited to the continuous eigenvalues of such systems in terms of the modes of the underlying Hermitian system. In photonic crystals, such thresholdless $\mathcal{PT}$ transitions are shown to yield significant control over the band structure of the system, and can result in all-angle supercollimation, a $\mathcal{PT}$-superprism effect, and unidirectional behavior.
description: 5 pages, 3 figures
Data from: Sexual selection, feather wear, and time constraints on the pre-basic molt explain the acquisition of the pre-alternate molt in European passerines
Creators: name: Cuervo, José J.
name: Morales, Judith
name: Soler, Juan J.
name: Moreno, Juan
Publisher: name: Zenodo
Year: 2022

description: Avian feathers need to be replaced periodically to fulfill their functions, with natural, social, and sexual selection presumably driving the evolution of molting strategies. In temperate birds, a common pattern is to molt feathers immediately after the breeding season, the pre-basic molt. However, some species undergo another molt in winter-spring, the pre-alternate molt. Using a sample of 188 European passerine species, Bayesian phylogenetic mixed models, and correlated evolution analyses, we tested whether the occurrence of the pre-alternate molt was positively associated with proxies for sexual selection (sexual selection hypothesis) and non-sexual social selection (social selection hypothesis) and with factors related to feather wear (feather wear hypothesis) and time constraints on the pre-basic molt (time constraints hypothesis). We found that the pre-alternate molt was more frequent in migratory and less gregarious species inhabiting open/xeric habitats and feeding on the wing, and marginally more frequent in species with strong sexual selection and those showing a winter territorial behavior. Moreover, an increase in migratory behavior and sexual selection intensity preceded the acquisition of the pre-alternate molt. These results provide support for the feather wear hypothesis, partial support for the sexual selection and time constraints hypotheses, and no support for the social selection hypothesis.
description: Funding provided by: Spanish Ministry of Economy and Competitiveness, Spanish Ministry of Science and Innovation, European Regional Development Fund*
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Genetic determinants of large artery stiffness : a focus on the extracellular matrix
Creators: name: Medley., Tanya
Publisher: name: Monash University
Year: 2021

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.