cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stabilizing Spherical Energy Shells with Angular Momentum in Gravitational Backgrounds
Creators: name: Antoniou, I.
name: Kazanas, D.
name: Papadopoulos, D.
name: Perivolaropoulos, L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Spherical energy shells in General Relativity tend to collapse due to gravitational effects and/or due to tension effects. Shell stabilization may be achieved by modifying the gravitational properties of the background spacetime. Thus, gravastars consist of stiff matter shells with an interior deSitter space and an exterior Schwarzshild spacetime whose attractive gravity balances the interior repulsive gravity of the interior deSitter spacetime leading to a stable stiff matter shell. Similar stabilization effects may be achieved by considering rotating shells. Here we study the stability of slowly rotating fluid shells. We show that the angular velocity of the shell has stabilizing properties analogous to the repulsive deSitter gravity of the interior of a gravastar. We thus use the Israel junction conditions and the fluid equation of state of the rotating shell to construct the dynamical equations that determine the evolution of the rotating shell radius. These dynamical equations depend on the parameters of the background spacetime and on the angular velocity of the shell. Assuming a rotating interior and a Schwarzschild exterior spacetime we show that the angular velocity of the shell has interesting stabilizing properties on the evolution of its radius R. Thus rotating matter (or vacuum) shells can imitate black holes while avoiding the presence of a singularity and without the presence of an interior deSitter space.
description: 19 pages, 2 figures. Accepted for publication in International Journal of Modern Physics D (to appear)
Radiative distortion of kinematic edges in cascade decays
Creators: name: Beneke, Martin
name: Jenniches, Laura
name: Mück, Alexander
name: Ubiali, Maria
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Kinematic edges of cascade decays of new particles produced in high-energy collisions may provide important constraints on the involved particles' masses. For the exemplary case of gluino decay $\tilde{g}\to q\bar q \tildeχ$ into a pair of quarks and a neutralino through a squark resonance, we study the hadronic invariant mass distribution in the vicinity of the kinematic edge. We perform a next-to-leading order calculation in the strong coupling $α_s$ and the ratio of squark width and squark mass $Γ_\tilde{q}/m_\tilde{q}$, based on a systematic expansion in $Γ_\tilde{q}/m_\tilde{q}$. The separation into hard, collinear and soft contributions elucidates the process dependent and universal features of distributions in the edge region, represented by on-shell decay matrix elements, universal jet functions and a soft function that depends on the resonance propagator and soft Wilson lines.
description: 15 pages, 5 figures
The structure, fluid flow and stable isotope geology of the northern Shinfield Zone, Mary Kathleen Fold Belt, northwest Queensland
Creators: name: Rawling, Timothy John.
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.
Higgs boson couplings in multi-doublet models with natural flavour conservation
Creators: name: Yagyu, Kei
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the deviation in the couplings of the standard model (SM) like Higgs boson ($h$) with a mass of 125 GeV from the prediction of the SM in multi-doublet models within the framework where flavour changing neutral currents at the tree level are naturally forbidden. After we present the general expressions for the modified gauge and Yukawa couplings for $h$, we show the correlation between the deviation in the Yukawa coupling for the tau lepton $hτ^+τ^-$ and that for the bottom quark $hb\bar{b}$ under the assumption of a non-zero deviation in the $hVV$ $(V=W,Z)$ couplings in two Higgs doublet models (2HDMs) and three Higgs doublet models (3HDMs) as simple examples. We clarify the possible allowed prediction of the deviations in the 3HDMs which cannot be explained in the 2HDMs even taking into account the one-loop electroweak corrections to the Yukawa coupling.
description: Version accepted in PLB
Ferroelectric nematic liquid crystalline phases
Creators: name: Sebastián, Nerea
name: Čopič, Martin
name: Mertelj, Alenka
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Recent experimental realization of ferroelectric nematic liquid crystalline phases stimulated material development and numerous experimental studies of these new phases, guided by their fundamental and applicative interest. In this Perspective, we give an overview of this emerging field by linking history and theoretical predictions to a general outlook of the development and properties of the materials exhibiting ferroelectric nematic phases. We will highlight the most relevant observations up-to-date, e.g., giant dielectric permittivity values, polarization values an order of magnitude larger than in classical ferroelectric liquid crystals, and nonlinear optical coefficients comparable to several ferroelectric solid materials. Key observations of anchoring and electro-optic behavior will also be examined. The collected contributions lead to a final discussion on open challenges in materials development, theoretical description, experimental explorations, and possible applications of the ferroelectric phases.
description: 30 pages, 17 Figures
Electron dynamics in small magnetospheres: insights from global fully-kinetic plasma simulations of planet Mercury
Creators: name: Lavorenti, Federico
name: Henri, Pierre
name: Califano, Francesco
name: Deca, Jan
name: Aizawa, Sae
name: André, Nicolas
name: Benkhoff, Johannes
Publisher: name: arXiv
Year: 2022
Subjects: subject: Space Physics (physics.space-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The planet Mercury possesses a small but highly dynamic magnetosphere in which the role and dynamics of electrons are still largely unknown. We aim at modeling the global dynamics of solar wind electrons impinging on Mercury's magnetosphere. Particular relevance is given to local acceleration processes and the global circulation patterns. The goals of this work are pursued by means of three-dimensional, fully kinetic particle-in-cell simulations modeling the interaction of the solar wind with the Hermean magnetosphere. This method allows a self-consistent representation of the plasma dynamics from the large planetary scale down to the electron kinetic scale. Numerical simulations are carried out using two different solar wind conditions: purely northward or purely southward interplanetary magnetic field direction. We find a high plasma current (of the order of few $μ$A/m2) flowing at the magnetospheric boundaries (bow shock and magnetopause) dominated by electrons. This current is driven by the small-scale electron physics resolved in our model. Furthermore, we observe strong electron acceleration up to tens of keV as a consequence of magnetic reconnection when the interplanetary magnetic field is directed southward. Such energetic electrons are partially trapped in the dipolar magnetic field of the planet mainly at nightside. Finally, by studying the distribution of electrons in our simulations along Mariner10 and BepiColombo first-Mercury-flyby trajectories, we propose that both spacecraft observed this energetic quasi-trapped electron population around closest approach.
description: Article submitted to "Astronomy and Astrophysics"
Ring wormholes via duality rotations
Creators: name: Gibbons, Gary W.
name: Volkov, Mikhail S.
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: We apply duality rotations and complex transformations to the Schwarzschild metric to obtain wormhole geometries with two asymptotically flat regions connected by a throat. In the simplest case these are the well-known wormholes supported by phantom scalar field. Further duality rotations remove the scalar field to yield less well known vacuum metrics of the oblate Zipoy-Voorhees-Weyl class, which describe ring wormholes. The ring encircles the wormhole throat and can have any radius, whereas its tension is always negative and should be less than $-c^4/4G$. If the tension reaches the maximal value, the geometry becomes exactly flat, but the topology remains non-trivial and corresponds to two copies of Minkowski space glued together along the disk encircled by the ring. The geodesics are straight lines, and those which traverse the ring get to the other universe. The ring therefore literally produces a hole in space. Such wormholes could perhaps be created by negative energies concentrated in toroidal volumes, for example by vacuum fluctuations.
description: matches the published version
Show your hands — Are you really clever? Reasoning, gesture production, and intelligence
Creators: name: Sassenberg, Uta
name: Foth, Manja
name: Wartenburger, Isabell
name: Van Der Meer, Elke
Publisher: name: Humboldt-Universität zu Berlin
Year: 2011
Subjects: subject: 400 Sprache

description: This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
description: This study investigates the relationship of reasoning and gesture production in individuals differing in fluid and crystallized intelligence. It combines mea-sures of speed and accuracy of processing geometric analogies with analyses of spontaneous hand gestures that accompanied young adults’ subsequent ex-planations of how they solved the geometric analogy task. Individuals with superior fluid intelligence processed the analogies more efficiently than par-ticipants with average fluid intelligence. Additionally, they accompanied their subsequent explanations with more gestures expressing movement in non- egocentric perspective. Furthermore, gesturing (but not speaking) about the most relevant aspect of the task was related to higher fluid intelligence. Within the gestures-as-simulated action framework, the results suggest that i ndividuals with superior fluid intelligence engage more in mental simulation during vi-sual imagery than those with average fluid intelligence. The findings stress the relationship between gesture production and general cognition, such as fluid intelligence, rather than its relationship to language. The role of gesture pro-duction in thinking and learning processes is discussed.
A Randomized Double-Blind Placebo-Controlled Trial Evaluating the Efficacy of Oral Cholecalciferol in Improving Renal and Vascular Functions in Vitamin D-Deficient Patients With Type 2 Diabetes Mellitus
Creators: name: Das, Saibal
name: Selvarajan, Sandhiya
name: Kamalanathan, Sadishkumar
name: Parameswaran, Sreejith
name: Zachariah, Bobby
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Marine Biology
subject: 60506 Virology

description: This study was performed to evaluate the efficacy of cholecalciferol in improving renal and vascular functions in vitamin D-deficient patients with type 2 diabetes mellitus (T2DM) along with chronic kidney disease (CKD). One hundred patients (18 − 65 years), having T2DM along with CKD (stage IIIA and IIIB) and hypovitaminosis D were randomized (1:1) to receive either oral cholecalciferol 60,000 IU (Group A) or placebo (Group B) weekly for 8 weeks along with standard background treatment. They were followed up for another 24 weeks. Various parameters of renal and vascular functions were compared. Except for serum calcium and phosphate levels which were significantly higher in Group A (p < 0.001), there was no significant difference in any of the biochemical or vascular parameters between the two groups at 8 weeks. There were comparable changes in urinary albumin–creatinine ratio and carotid-femoral pulse wave velocity in the two groups at 8 and 24 weeks. There was no improvement in any of the vascular parameters from the corresponding baseline values in the two groups at 8 and 32 weeks. No improvement in renal and vascular functions was observed following treatment with oral cholecalciferol in patients with T2DM and CKD.
Development of an electron impact ion source with high ionization efficiency for future planetary missions
Creators: name: Kawashima, Oya
name: Yanase, Naho
name: Okitsu, Yoshihisa
name: Hirahara, Masafumi
name: Saito, Yoshifumi
name: Karouji, Yuzuru
name: Yamamoto, Naoki
name: Yokota, Shoichiro
name: Kasahara, Satoshi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Ion sources using electron impact ionization (EI) methods have been widely accepted in mass spectrometry for planetary exploration missions because of their simplicity. Previous space-borne mass spectrometers were primarily designed with the EI method using rhenium tungsten alloy filaments, enabling up to 200 uA emission in typical cases. The emission level is desired to be enhanced because the sensitivity of mass spectrometers is a critical requirement for the future in situ mass spectrometry related to the measurement of trace components in planetary samples. In this study, we developed a new high-emission EI ion source using a Y2O3-coated iridium filament, which has a lower work function than rhenium tungsten alloy. The size of the ion source was 30 mm * 26 mm * 70 mm, and its weight was 70 g. We confirmed that when consuming 3.0 W power, the ion source emits more than 2 mA electrons, which is 10 times greater than the previous models electron emission level. Ionization efficiency of the EI ion source is proportional to the amount of electron emission, which implies our new model increased the ionization efficiency 10 times. We conducted performance tests on the prototype with the 3.0 W heating condition, confirming a high ionization efficiency (10^4 nA/Pa). In addition, we conducted endurance tests of the ion source and demonstrated the persistence of the ionization efficiency for 30 min * 100 cycles.
description: 25 pages, 8 figures, submitted to Planetary and Space Science
Modelling electrical properties of arterioles
Creators: name: Murray-Hogeboom, Karen.
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.
Systematic lowering of the scaling of Monte Carlo calculations by partitioning andsubsampling
Creators: name: Bienvenu, Antoine
name: Feldt, Jonas
name: Toulouse, Julien
name: Assaraf, Roland
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We propose to compute physical properties by Monte Carlo calculations using conditional expectation values. The latter are obtained on top of the usual Monte Carlo sampling by partitioning the physical space in several subspaces or fragments, and subsampling each fragment (i.e., performing side walks) while freezing the environment. No bias is introduced and a zero-variance principle holds in the limit of separability, i.e. when the fragments are independent. In practice, the usual bottleneck of Monte Carlo calculations -- the scaling of the statistical fluctuations as a function of the number of particles N -- is relieved for extensive observables. We illustrate the method in variational Monte Carlo on the 2D Hubbard model and on metallic hydrogen chains using Jastrow-Slater wave functions. A factor O(N) is gained in numerical efficiency.
Radiative transfer of acoustic waves in continuous complex media: Beyond the Helmholtz equation
Creators: name: Baydoun, Ibrahim
name: Baresch, Diego
name: Pierrat, Romain
name: Derode, Arnaud
Publisher: name: arXiv
Year: 2016
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Heterogeneity can be accounted for by a random potential in the wave equation. For acoustic waves in a fluid with fluctuations of both density and compressibility (as well as for electromagnetic waves in a medium with fluctuation of both permittivity and permeability) the random potential entails a scalar and an operator contribution. For simplicity, the latter is usually overlooked in multiple scattering theory: whatever the type of waves, this simplification amounts to considering the Helmholtz equation with a sound speed $c$ depending on position $\mathbf{r}$. In this work, a radiative transfer equation is derived from the wave equation, in order to study energy transport through a multiple scattering medium. In particular, the influence of the operator term on various transport parameters is studied, based on the diagrammatic approach of multiple scattering. Analytical results are obtained for fundamental quantities of transport theory such as the transport mean-free path $\ell^*$, scattering phase function $f$ and anisotropy factor $g$. Discarding the operator term in the wave equation is shown to have a significant impact on $f$ and $g$, yet limited to the low-frequency regime i.e., when the correlation length of the disorder $\ell_c$ is smaller than or comparable to the wavelength $λ$. More surprisingly, discarding the operator part has a significant impact on the transport mean-free path $\ell^*$ whatever the frequency regime. When the scalar and operator terms have identical amplitudes, the discrepancy on the transport mean-free path is around $300\,\%$ in the low-frequency regime, and still above $30\,\%$ for $\ell_c/λ=10^3$ no matter how weak fluctuations of the disorder are. Analytical results are supported by numerical simulations of the wave equation and Monte Carlo simulations.
DBIS – Eine erfolgreiche Kooperation in die Zukunft führen
Creators: name: Moßburger, Luis
name: Riedl, Felix
name: Lehenmeier, Constantin
name: Doß, Brigitte
Publisher: name: Universität Regensburg
Year: 2021
Subjects: subject: DBIS, User Experience, Informationsinfrastruktur
subject: 020 Bibliotheks- und Informationswissenschaft

description: Zusammenfassung:
Mit dem Datenbank-Infosystem (DBIS) arbeiten kooperativ weit über 300 Bibliotheken. DBIS stellt somit einen wichtigen Teil der deutschsprachigen wissenschaftlichen Informationsinfrastruktur dar. Diese Infrastruktur wird immer internationaler und moderner, was neue Anforderungen an DBIS mit sich bringt. In einem von der DFG geförderten Projekt soll DBIS daher umfassend modernisiert werden. Dafür wurden an der Universitätsbibliothek Regensburg zunächst verschiedene Formen des User Experience (UX) Research, also der Forschung zu Erfahrungen mit DBIS und zur Nutzung der Plattform, durchgeführt. Dieser Artikel stellt insbesondere die Methodik des UX Research vor und stellt diese in den Zusammenhang des DBIS-Projekts und dessen Weg in die Zukunft.
Summary:
The Database Information System (DBIS) is used by well over 300 institutions. It is therefore an important part of the German information infrastructure. This infrastructure is becoming more and more international and modern, which brings new requirements for DBIS. Therefore, DBIS will be comprehensively modernized in a project funded by the DFG. To this end, various forms of user experience (UX) research, i.e., research on experiences with DBIS and on the use of the platform, were conducted at Regensburg University Library. This article introduces the UX research methodology in particular, and places it in the context of the DBIS project and its plans for its future.
Desafíos virtuales y digitales de las bibliotecas universitarias ante el COVID-19
Creators: name: Gutiérrez, Fernando Gabriel
Publisher: name: Zenodo
Year: 2020
Subjects: COVID-19
Bibliotecas universitarias
Academic libraries
Pandemic

description: Ante la situación inesperada de aislamiento por COVID-19, los escenarios digitales y virtuales se han potenciado y la presencialidad ha dejado la modalidad “normal” de las bibliotecas. En este contexto, las bibliotecas universitarias tienen el desafío de seguir ideando y repensando los servicios digitales para su adaptación ante una ¿nueva? modalidad. En esta charla se reflexionarr ante este panorama de pandemia, se propondrán ideas y líneas de acción ante esta situación difícil.
Effectiveness of Tinnitan Duo® in Subjective Tinnitus with Emotional Affectation: A Prospective, Interventional Study
Creators: name: Knäpper, Jennifer
name: Girauta, M. Victoria
name: Coromina, Jordi
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Molecular Biology
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: To assess the effectiveness of a food supplement (Tinnitan Duo®) containing 5-hydroxytryptophan, Ginkgo biloba, magnesium, melatonin, vitamin B5 and B6, and zinc at improving tinnitus response and intensity. Prospective, single-center interventional study including patients with subjective tinnitus and emotional affectation. The primary endpoint was the change in the Tinnitus Handicap Inventory (THI) total score and the emotional subscale after 3 months of treatment. Secondary endpoints were the change from baseline to month 3 in (1) the Tinnitus Distress Rating (TDR) scale, and (2) in hearing status, and the safety profile of patients throughout the study. Sixty-one patients were included, and 29 completed the study. The THI total score was significantly reduced after 3 months of treatment in the per-protocol (PP, all the patients with no major protocol deviations) and intention-to-treat (ITT) populations (−15.7 and −7.5, respectively; p = 0.001). The emotional subscale score significantly decreased after 3 months of treatment by −5.6 in the PP (p = 0.001) and by −2.6 in the ITT populations (p = 0.001). Perceived tinnitus loudness significantly decreased after 3 months of treatment (p = 0.001). The audiogram showed no significant changes in hearing status after 3 months of treatment. Of the five adverse events (AEs) reported, all were mild or moderate, and three were related to the study treatment (two headaches and one dizziness). This new food supplement was associated with an improved tinnitus-related emotional affectation and with a good safety profile.
Effects of dimethyl sulfoxide on surface water near phospholipid bilayers
Creators: name: Lee, Yuno
name: Pincus, Philip A.
name: Hyeon, Changbong
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Despite much effort to probe the properties of dimethyl sulfoxide (DMSO) solution, effects of DMSO on water, especially near plasma membrane surfaces still remain elusive. By performing molecular dynamics (MD) simulations at varying DMSO concentrations ($X_{\text{DMSO}}$), we study how DMSO affects structural and dynamical properties of water in the vicinity of phospholipid bilayers. As proposed by a number of experiments, our simulations confirm that DMSO induces dehydration from bilayer surfaces and disrupts the H-bond structure of water. However, DMSO enhanced water diffusivity at solvent-bilayer interfaces, an intriguing discovery reported by a spin-label measurement, is not confirmed in our simulations. In order to resolve this discrepancy, we examine the location of the spin-label (Tempo), relative to the solvent-bilayer interface. In accord with the evidence in the literature, our simulations, which explicitly model Tempo-PC, find that the Tempo moiety is equilibrated at $\sim 8-10$ Å \emph{below} the bilayer surface. Furthermore, the DMSO-enhanced surface water diffusion is confirmed only when water diffusion is analyzed around the Tempo moiety that is immersed below the bilayer surface, which implies that the experimentally detected signal of water using Tempo stems from the interior of bilayers, not from the interface. Our analysis finds that the increase of water diffusion below the bilayer surface is coupled to the increase of area per lipid with an increasing $X_{\text{DMSO}}$ $(\lesssim 10\text{ mol\%})$. Underscoring the hydrophobic nature of Tempo moiety, our study calls for careful re-evaluation of the use of Tempo in the measurement on lipid bilayer surfaces.
description: 18 pages, 16 figures
The design and analysis of cross-over designs with categorical responses
Creators: name: Liew, 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.
Phonon anharmonicity, lifetimes and thermal transport in CH$_3$NH$_3$PbI$_3$ from many-body perturbation theory
Creators: name: Whalley, Lucy D.
name: Skelton, Jonathan M.
name: Frost, Jarvist M.
name: Walsh, Aron
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Lattice vibrations in CH$_3$NH$_3$PbI$_3$ are strongly interacting, with double well instabilities present at the Brillouin zone boundary. Analysis within a first-principles lattice dynamics framework reveals anharmonic potentials with short phonon quasi-particle lifetimes and mean-free paths. The phonon behaviour is distinct from the inorganic semiconductors GaAs and CdTe where three-phonon interaction strengths are three orders of magnitude smaller. The implications for the applications of hybrid halide perovskites arising from thermal conductivity, band-gap deformation, and charge-carrier scattering through electron-phonon coupling, are presented.
การสื่อสารการตลาดดิจิทัลสำหรับร้านขนมไทยในยุคปกติวิถีใหม่
Creators: name: วิศนันท์  อุปรมัย
Publisher: name: Kasem bundit University
Year: 2023
Subjects: การสื่อสารการตลาดดิจิทัล
ขนมไทย,ยุคปกติวิถีใหม่

description: Kasem Bundit Journal, 24, 1, 1-17
Relativistic magnetic explosions
Creators: name: Barkov, Maxim V.
name: Sharma, Praveen
name: Gourgouliatos, Konstantinos N.
name: Lyutikov, Maxim
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Many explosive astrophysical events, like magnetars' bursts and flares, are magnetically driven. We consider dynamics of such magnetic explosions - relativistic expansion of highly magnetized and highly magnetically over-pressurized clouds. The corresponding dynamics is qualitatively different from fluid explosions due to the topological constraint of the conservation of the magnetic flux. Using analytical, relativistic MHD as well as force-free calculations, we find that the creation of a relativistically expanding, causally disconnected flow obeys a threshold condition: it requires sufficiently high initial over-pressure and sufficiently quick decrease of the pressure in the external medium (the pre-explosion wind). In the subcritical case the magnetic cloud just "puffs-up" and quietly expands with the pre-flare wind. We also find a compact analytical solution to the Prendergast's problem - expansion of force-free plasma into vacuum.
description: 31 pages, 23 figures, submitted to ApJ
Pinning of fermionic occupation numbers: Higher spatial dimensions and spin
Creators: name: Tennie, Felix
name: Vedral, Vlatko
name: Schilling, Christian
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The role of the generalized Pauli constraints (GPCs) in higher spatial dimensions and by incorporating spin degrees of freedom is systematically explored for a system of interacting fermions confined by a harmonic trap. Physical relevance of the GPCs is confirmed by analytical means for the ground state in the regime of weak couplings by finding its vector of natural occupation numbers close to the boundary of the allowed region. Such quasipinning is found to become weaker in the intermediate and strong coupling regime. The study of crossovers between different spatial dimensions by detuning the harmonic trap frequencies suggests that quasipinning is essentially an effect for systems with reduced spatial dimensionality. In addition, we find that quasipinning becomes stronger by increasing the degree of spin-polarization. Consequently, the number of states available around the Fermi level plays a key role for the occurrence of quasipinning. This suggests that quasipinning emerges from the conflict between energy minimization and fermionic exchange symmetry.
description: published version
Dark sector domain walls could explain the observed planes of satellites
Creators: name: Naik, Aneesh P.
name: Burrage, Clare
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The observed `planes of satellites' around the Milky Way and other nearby galaxies are notoriously difficult to explain under the $Λ$CDM paradigm. Here, we propose an alternative solution: domain walls arising in theories with symmetry-breaking scalar fields coupled to matter. Because of the matter coupling, satellite galaxies experience fifth forces as they pass through domain walls, leading to a subset of satellites with orbits confined to the domain wall plane. We demonstrate this effect using simple simulations of a toy model comprising point-like satellites and an infinite domain wall, and explore the efficacy of various planarity metrics in detecting this effect. We believe this is the first potential `new physics' explanation for the observed planes of satellites which does not do away with dark matter.
description: Updated to match version accepted by JCAP. All code and plotting scripts available at https://github.com/aneeshnaik/PoSDomainWalls
Gravity wave detection using routine operational radiosonde and radar data
Creators: name: Adams, Neil David.
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.
Absence of Many-Body Localization in a Single Landau Level
Creators: name: Geraedts, Scott D.
name: Bhatt, R. N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The dynamics of the highly excited states of a system projected into a single Landau level are analyzed. An analysis of level spacing ratios for finite size systems shows a clear crossover from extend (GUE) to localized (Poisson) statistics, indicating a many body localization transition. However, the location of this transition depends very strongly on system size, and appears to scale to infinite disorder in the thermodynamic limit. This result does not depend on the properties of the ground state (such as whether the ground state exhibits topological order), as expected for a transition of highly-excited eigenstates. We therefore conclude that many body localization does not exist in these systems. Our results demonstrate that a sub-thermodynamic number of single particle effectively extended states is sufficient to cause all many body states to become extended.
Observational Signatures of High-Redshift Quasars and Local Relics of Black Hole Seeds
Creators: name: Reines, Amy
name: Comastri, Andrea
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Observational constraints on the birth and early evolution of massive black holes (BHs) come from two extreme regimes. At high redshift, quasars signal the rapid growth of billion-solar-mass BHs and indicate that these objects began remarkably heavy and/or accreted mass at rates above the Eddington limit. At low redshift, the smallest nuclear BHs known are found in dwarf galaxies and provide the most concrete limits on the mass of BH seeds. Here we review current observational work in these fields that together are critical for our understanding of the origin of massive BHs in the Universe.
description: Invited review accepted for publication in PASA as part of the special issue on high-redshift black holes (23 pages, 18 figures, 2 tables). Table 1 and Figure 2 have been updated in version 2
Fundamental forces and their dynamics
Creators: name: Dadhich, Naresh
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this essay, we wish to propose a general principle: \it{the equation of motion or dynamics of a fundamental force should not be prescribed but instead be entirely driven by geometry of the appropriate spacetime manifold, and the equation is then obtained by employing only the geometric property without appeal to an action.} The motivation for this pronouncement comes from the fact that the equation of motion of general relativity follows from the geometry of Riemannian spacetime manifold without appeal to anything else from outside. The driving differential geometric property is the Bianchi identity satisfied by the Riemann curvature tensor. Similarly it is geometry of the principal tangent bundle of fibre spacetime manifold that may account for dynamics of the gauge vector fields. It is the classical electric force for the Abelian gauge symmetry group while the non-Abelian symmetry leads to the non-Abelian forces, the weak and the strong. We shall also reflect on a unified picture of the basic forces, and the duality correspondences it may inspire.
description: Revamped and published version, Contribution to Professor T. Padmanabhan memorial volume, GRG Journal
Scattering-assisted and logic-controllable WGM laser in liquid crystal micropillar
Creators: name: Zhang, Jin Chuan
name: Zhu, Hong Yang
name: Zhu, Xiao Mei
name: Zhang, Yan Li
name: Wang, Zhao
name: Chen, Fei Liang
name: Li, Ke
name: Li, Xiao Feng
name: Zhang, Wei Li
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Whispering gallery mode (WGM) microcavities can efficiently store and manipulate light with strong light confinement and long photon lifetime, while coupling light into and from WGMs is intrinsically hindered by their unique feature of rotational symmetry. Here, a scattering-assisted liquid crystal (LC) micropillar WGM laser is proposed. WGM lasing at the surface of the micropillar is obviously enhanced by fluorescence scattering in the core of the micropillar. Besides, weak scattering of LC molecules also builds efficient coupling channels between the laser modes and the axial transmission modes of the micropillar-based waveguide, providing an all-in-one liquid WGM laser with functions of self-seeding and self-guiding. Furthermore, based on the hysteresis characteristics of the electrically anchored LC molecules under the interaction of thermal force, an erasable read-write liquid memory device is proposed, paving the way for the application of logic-controllable WGM lasers in optical storage and optical control.
Inverse participation ratios in the XXZ spin chain
Creators: name: Misguich, Grégoire
name: Pasquier, Vincent
name: Luck, Jean-Marc
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate numerically the inverse participation ratios in a spin-1/2 XXZ chain, computed in the "Ising" basis (i.e., eigenstates of $σ^z_i$). We consider in particular a quantity $T$, defined by summing the inverse participation ratios of all the eigenstates in the zero magnetization sector of a finite chain of length $N$, with open boundary conditions. From a dynamical point of view, $T$ is proportional to the stationary return probability to an initial basis state, averaged over all the basis states (initial conditions). We find that $T$ exhibits an exponential growth, $T\sim\exp(aN)$, in the gapped phase of the model and a linear scaling, $T\sim N$, in the gapless phase. These two different behaviors are analyzed in terms of the distribution of the participation ratios of individual eigenstates. We also investigate the effect of next-nearest-neighbor interactions, which break the integrability of the model. Although the massive phase of the non-integrable model also has $T\sim\exp(aN)$, in the gapless phase $T$ appears to saturate to a constant value.
description: 8 pages, 7 figures. v2: published version (one figure and 3 references added, several minor changes)
In-situ measurements of twist and bend elastic constants in oblique helicoidal cholesteric
Creators: name: Iadlovska, Olena S.
name: Thapa, Kamal
name: Rajabi, Mojtaba
name: Shiyanovskii, Sergij V.
name: Lavrentovich, Oleg D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Unique electro-optical properties of the oblique helicoidal cholesteric (ChOH) stem from its heliconical director structure. An applied electric field preserves the single harmonic modulation of the director while tuning the ChOH period and the corresponding Bragg peak wavelength within a broad spectral range. We use the response of ChOH to the electric field to measure the elastic constants of twist K22 and bend K33 directly in the cholesteric phase. The temperature dependencies of K22 and K33 allow us to determine the range of the electric tunability of the ChOH pitch and the heliconical angle. The data are important for understanding how molecular composition and chirality influence macroscopic elastic properties of the chiral liquid crystals and for the development of ChOH-based optical devices.
description: 19 pages, 10 figures
Optimization of detector modules for measuring gamma-ray polarization in Positron Emission Tomography
Creators: name: Parashari, Siddharth
name: Makek, Mihael
name: Bokulić, Tomislav
name: Bosnar, Damir
name: Kožuljević, Ana Marija
name: Kuncic, Zdenka
name: Žugec, Petar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Detection of $γ$-ray polarization in Positron Emission Tomography (PET) is as yet an unexploited feature that could be used as an additional handle to improve signal-to-background ratio in this imaging modality. The $γ$ polarization is related to the azimuthal angle in the Compton scattering process, so the initial correlation of polarizations of the annihilation quanta translates to the correlation of the azimuthal angles in events where both annihilation photons undergo Compton scattering. This results in a modulated distribution of the azimuthal angle difference for true events, while this modulation is lacking for the background events. We present a comprehensive experimental study of five detector configurations based on scintillator matrices and silicon photomultipliers, suitable for measuring the azimuthal modulation. The modules consist of either GaGG:Ce or LYSO:Ce pixels with sizes varying from 1.9x1.9x20 $\mathrm{mm^3}$ to 3x3x20 $\mathrm{mm^3}$. The distinctive feature of the modules is that they can reconstruct the Compton scattering by detecting the recoil electron and the scattered gamma in a single detector layer, which simplifies extension to larger systems. The amplitude modulation of the azimuthal angles' difference is clearly observable in all configurations ranging from $0.26\pm0.01$ to $0.34\pm 0.02$ depending on the event selection criteria. The results suggest that finer detector segmentation plays a leading role in achieving higher modulation factors.
Optical designs for the Maunakea Spectroscopic Explorer Telescope
Creators: name: Saunders, Will
name: Gillingham, Peter
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Optical designs are presented for the Maunakea Spectroscopic Explorer (MSE) telescope. The adopted baseline design is a prime focus telescope with a segmented primary of 11.25m aperture, with speed f/1.93 and 1.52deg field-of-view, optimized for wavelengths 360-1800nm. The Wide-Field Corrector (WFC) has five aspheric lenses, mostly of fused silica, with largest element 1.33m diameter and total glass mass 788kg. The Atmospheric Dispersion Corrector (ADC) is of the compensating lateral type, combining a motion of the entire WFC via the hexapod, with a restoring motion for a single lens. There is a modest amount of vignetting (average 5% over the hexagonal field); this greatly improves image quality, and allows the design to be effectively pupil-centric. The polychromatic image quality is d80<0.225"/0.445" at ZD 0/60deg over more than 95% of the hexagonal field-of-view. The ADC action allows adjustment of the plate-scale with zenith distance, which is used to halve the image motions caused by differential refraction. A simple design is presented for achieving the required ADC lens shifts and tilts. A two-mirror design was also undertaken for MSE, but was not selected. This is a 12.3m F/2.69 forward Cassegrain design, with a 2.75m diameter M2, and three silica lenses, of largest diameter 1.33m. The field-of-view is again 1.52deg. The f/0.95 primary makes the design remarkably compact, being under 10m long. The ADC action involves a small motion of M2 (again via a hexapod), and shifts and tilts of a single lens. The design is effectively pupil-centric, with modest vignetting (5.9% average). The image quality is virtually identical to the prime focus design.
description: 12 pages, SPIE 2016
The Currawong Zn-Cu-Pb(-Au) massive sulphide deposit, Benambra, northeastern Victoria
Creators: name: Bodon, Stephen B. .
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.
การออกแบบฟิลเตอร์เอ็นดีจากฟิล์มติดรถยนต์เพื่อใช้การถ่ายภาพ
Creators: name: จักรีรัตน์ ณ ลำพูน
Publisher: name: Kasem bundit University
Year: 2023
Subjects: ฟิลเตอร์เอ็นดี
ฟิล์มติดรถยนต์

description: Kasem Bundit Journal, 24, 1, 18-32
Berkolaborasi dengan Mendeley
Creators: name: Turista, Dora Dayu Rahma
name: Kurniawan, Putu Sukma
Publisher: name: Zenodo
Year: 2020
Subjects: Colaboration
Mendeley

description: Materi ini disampaikan pada acara One Day Mendeley 2: Mendeley Advance pada Sabtu, 20 Juni 2020 Pukul 13.00-16.00
Phonon-modulated-hopping Polarons: X-representation Technique
Creators: name: Prokof'ev, Nikolay V.
name: Svistunov, Boris V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by the problem of polaron effect due to phonon-modulated hopping, we formulate a generic Monte Carlo technique for solving it in the coordinate representation for both the particle and atomic displacements. The method applies to a broad class of models; the only condition is that the hopping amplitude be sign-positive. A dramatic simplification of the scheme, with the corresponding efficiency gain, takes place in models with dispersionless phonons. Our study sheds important light on the nature and universality of the most striking qualitative and quantitative effects demonstrated by the "standard" (Peierls/Su-Schrieffer-Heeger) model based on the linearized displacement-modulated hopping.
description: 5 pages, 6 figures
อิทธิพลของส่วนประสมทางการตลาด ความไว้วางใจ และความพึงพอใจต่อการตัดสินใจซื้อสินค้าแฟชั่นด้วยระบบออนไลน์
Creators: name: รัตนไชย สิงห์ตระหง่าน
Publisher: name: Kasem bundit University
Year: 2023
Subjects: ส่วนประสมทางการตลาด
ความไว้วางใจ
ความพึงพอใจ
การตัดสินใจซื้อ

description: Kasem Bundit Journal, 24, 1, 33-46
Wire and extended ladder model predict THz oscillations in DNA monomers, dimers and trimers
Creators: name: Lambropoulos, K.
name: Kaklamanis, K.
name: Morphis, A.
name: Tassi, M.
name: Lopp, R.
name: Georgiadis, G.
name: Theodorakou, M.
name: Chatzieleftheriou, M.
name: Simserides, C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We call \textit{monomer} a B-DNA base pair and study, analytically and numerically, electron or hole oscillations in \textit{monomers}, \textit{dimers} and \textit{trimers}. We employ two Tight Binding (TB) approaches: (I) at the base-pair level, using the on-site energies of the base pairs and the hopping parameters between successive base pairs i.e. \textit{a wire model}, and (II) at the single-base level, using the on-site energies of the bases and the hopping parameters between neighbouring bases, specifically between (a) two successive bases in the same strand, (b) complementary bases that define a base pair, and (c) diagonally located bases of successive base pairs, i.e. \textit{an extended ladder model} since it also includes the diagonal hoppings (c). For \textit{monomers}, with TB II, we predict periodic carrier oscillations with frequency $f \approx$ 50-550 THz. For \textit{dimers}, with TB I, we predict periodic carrier oscillations with $f \approx$ 0.25-100 THz. For \textit{trimers made of identical monomers}, with TB I, we predict periodic carrier oscillations with $f \approx$ 0.5-33 THz. In other cases, either with TB I or TB II, the oscillations may be not strictly periodic, but Fourier analysis shows similar frequency content. For dimers and trimers, TB I and TB II are successfully compared giving complementary aspects of the oscillations.
description: 32 pages, 10 + 5 = 15 figures
การศึกษาความรับผิดชอบของนักศึกษาระดับปริญญาตรีมหาวิทยาลัยเกษมบัณฑิต
Creators: name: สายใจ ระดมสุข
Publisher: name: Kasem bundit University
Year: 2023
Subjects: ความรับผิดชอบ
นักศึกษาระดับปริญญาตรี

description: Kasem Bundit Journal, 24, 1, 47-64