cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Inertial particles distribute in turbulence as Poissonian points with random intensity inducing clustering and supervoiding
Creators: name: Schmidt, Lukas
name: Fouxon, Itzhak
name: Holzner, Markus
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: This work considers the distribution of inertial particles in turbulence using the point-particle approximation. We demonstrate that the random point process formed by the positions of particles in space is a Poisson point process with log-normal random intensity ("log Gaussian Cox process" or LGCP). The probability of having a finite number of particles in a small volume is given in terms of the characteristic function of a log-normal distribution. Corrections due to discreteness of the number of particles to the previously derived statistics of particle concentration in the continuum limit are provided. These are relevant for dealing with experimental or numerical data. The probability of having regions without particles, i.e. voids, is larger for inertial particles than for tracer particles where voids are distributed according to Poisson processes. Further, the probability of having large voids decays only log-normally with size. This shows that particles cluster, leaving voids behind. At scales where there is no clustering there can still be an increase of the void probability so that turbulent voiding is stronger than clustering. The demonstrated double stochasticity of the distribution originates in the two-step formation of fluctuations. First, turbulence brings the particles randomly close together which happens with Poisson-type probability. Then, turbulence compresses the particles' volume in the observation volume. We confirm the theory of the statistics of the number of particles in small volumes by numerical observations of inertial particle motion in a chaotic ABC flow. The improved understanding of clustering processes can be applied to predict the long-time survival probability of reacting particles. Our work implies that the particle distribution in weakly compressible flow with finite time correlations is a LGCP, independently of the details of the flow statistics.
Application of standard-setting methods in public examinations
Creators: name: Zoani, Ammon J.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.
Notebook 44 - "There was a Picnic in Grassy Plain"
Creators: name: Seel, Else, 1894-1974
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Literature
valueUri: http://id.worldcat.org/fast/999953
subject: Authors, German
valueUri: http://id.worldcat.org/fast/822051
subject: Authors
valueUri: http://id.worldcat.org/fast/821688

description: A piece of prose composed by Else Seel.
Does Self-Efficacy Contribute to the Retrieval Practice Effect?
Creators: name: Frankenstein, Andrea N.
Publisher: name: University of Illinois at Chicago
Year: 2019
Subjects: Uncategorized

description: The retrieval practice effect is a memory benefit for information that is tested or retrieved one or more times before a final test. This memory improvement is seen when compared to instances when information is simply re-read or re-studied prior to final test. The benefits of retrieval practice are robust, extending to different types of learning materials (e.g., word pairs, text passages, lecture videos) and different settings (e.g., lab, classroom, online). There are several potential explanations for why retrieval practice benefits memory over re-studying, most of which hinge on cognitive mechanisms. However, it is possible that other, social-cognitive factors could also underlie this memory effect. One such factor could be self-efficacy, which has been shown to be positively related to memory performance. This study sought to replicate previous work showing a retrieval practice effect and examined whether a social-cognitive factor, self-efficacy, could partially explain improved performance due to retrieval practice. Final test performance for the retrieval practice and re-study conditions were compared, and self-efficacy scores were analyzed to determine if they mediated the relationship between condition (re-study, retrieval practice) and final test performance. Overall, there was a significant retrieval practice effect, with the retrieval practice group scoring significantly higher on the final test than the re-study group. This finding replicates prior work showing the memory benefits of retrieval practice. Self-efficacy was not a significant mediator of the retrieval practice effect. However, change in self-efficacy was positively related to final test performance: the larger the increase in self-efficacy, the better memory performance on the final test. These findings are in line with previous work showing that higher self-efficacy is associated with better memory. While self-efficacy was not found to be a significant mediator in this study, further research can focus on the effects of direct manipulations of self-efficacy on memory performance.
Notebook 44 - "Ootsa"
Creators: name: Seel, Else, 1894-1974
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Authors, German
valueUri: http://id.worldcat.org/fast/822051
subject: Literature
valueUri: http://id.worldcat.org/fast/999953
subject: Authors
valueUri: http://id.worldcat.org/fast/821688

description: A piece of prose composed by Else Seel.
Solar system dynamics in general relativity
Creators: name: Battista, Emmanuele
name: Dell'Agnello, Simone
name: Esposito, Giampiero
name: Di Fiore, Luciano
name: Simo, Jules
name: Grado, Aniello
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recent work in the literature has advocated using the Earth-Moon-planetoid Lagrangian points as observables, in order to test general relativity and effective field theories of gravity in the solar system. However, since the three-body problem of classical celestial mechanics is just an approximation of a much more complicated setting, where all celestial bodies in the solar system are subject to their mutual gravitational interactions, while solar radiation pressure and other sources of nongravitational perturbations also affect the dynamics, it is conceptually desirable to improve the current understanding of solar system dynamics in general relativity, as a first step towards a more accurate theoretical study of orbital motion in the weak-gravity regime. For this purpose, starting from the Einstein equations in the de Donder-Lanczos gauge, this paper arrives first at the Levi-Civita Lagrangian for the geodesic motion of celestial bodies, showing in detail under which conditions the effects of internal structure and finite extension get cancelled in general relativity to first post-Newtonian order. The resulting nonlinear ordinary differential equations for the motion of planets and satellites are solved for the Earth's orbit about the Sun, written down in detail for the Sun-Earth-Moon system, and investigated for the case of planar motion of a body immersed in the gravitational field produced by the other bodies (e.g. planets with their satellites). At this stage, we prove an exact property, according to which the fourth-order time derivative of the original system leads to a linear system of ordinary differential equations. This opens an interesting perspective on forthcoming research on planetary motions in general relativity within the solar system, although the resulting equations remain a challenge for numerical and qualitative studies.
description: 26 pages, 3 figures
The Optics of Refractive Substructure
Creators: name: Johnson, Michael D.
name: Narayan, Ramesh
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Newly recognized effects of refractive scattering in the ionized interstellar medium have broad implications for very long baseline interferometry (VLBI) at extreme angular resolutions. Building upon work by Blandford & Narayan (1985), we present a simplified, geometrical optics framework, which enables rapid, semi-analytic estimates of refractive scattering effects. We show that these estimates exactly reproduce previous results based on a more rigorous statistical formulation. We then derive new expressions for the scattering-induced fluctuations of VLBI observables such as closure phase, and we demonstrate how to calculate the fluctuations for arbitrary quantities of interest using a Monte Carlo technique.
description: 11 Pages, 4 Figures, Accepted for publication in ApJ
Stability of Universal Constructions for Persistent Homology
Creators: name: Lazovskis, Janis
Publisher: name: University of Illinois at Chicago
Year: 2019
Subjects: Uncategorized

description: In this thesis I describe poset stratifications of the product of the Ran space and the nonnegative real numbers, as a universal space for the Cech construction of simplicial complexes. This leads to a cosheaf valued in diagrams of simplicial complexes for which every restriction to a finite collection recovers the persistent homology of the collection. For the stratification, I describe a partial order on isomorphism classes of abstract simplicial complexes, which allows spaces stratified by them to have entrance paths uniquely interpreted as simplicial maps. Decomposing entrance paths gives a sheaf structure, which has higher information that the cosheaf does not capture.
Evolution not revolution : an examination of the uses of computers in Australian educational settings
Creators: name: Zammit, Susan A.
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.
Tahtsa River
Creators: name: Seel, Else, 1894-1974
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Authors, German
valueUri: http://id.worldcat.org/fast/822051

description: A piece of prose by Else Seel. Verso of page 9 contains a holograph poem "Der Heron".
Confinement from Center Vortices: A review of old and new results
Creators: name: Greensite, Jeff
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: I briefly review the numerical evidence, some old and some quite recent, in favor of the center vortex theory of confinement.
description: Invited talk at the Confinement 12 meeting, Thessaloniki, Greece, Aug. 2016. 12 pages, 8 figures
Addressing the Gap Between Recommended Infant Care Practices and Reality Using the Ecological Framework
Creators: name: Rowe, Hillary Louise
Publisher: name: University of Illinois at Chicago
Year: 2019
Subjects: Uncategorized

description: The Theory of Planned Behavior (TPB; Ajzen, 1991) has been applied to breastfeeding and infant safe sleep practices to understand why some parents do not follow the American Academy of Pediatrics recommendations. This theory has limited usefulness for these behaviors, however, because it does not account for the dynamic nature of these behaviors over time. The current study addressed this limitation by assessing the TPB constructs and then applying principles from the Ecological Framework (Trickett, Kelly, & Vincent, 1985) to the contexts in which women perform these behaviors over the first 3 months postpartum. Eight women who were pregnant with their first child were interviewed using qualitative semi-structured interview guides during their third trimester of pregnancy to assess their plans and intentions, and at 10-14 weeks postpartum to assess their behaviors over time. Women also completed up to five phone interviews between delivery and the follow-up interview to collect data on their current feeding and sleep practices. Results from the TPB analyses replicated several findings from previous research. Analyses also identified previously unreported factors that affect women’s attitudes and perceived behavioral control over the behaviors of interest, most notably how women’s behavioral intentions are influenced by considerations for the mother-infant dyad, and not just the needs of the infant. Results from the ecological assessment identified several contextual factors for which the TPB does not account, including accessibility and use of resources (e.g., medical advice or support, familial support, and products to support breastfeeding and infant sleep) and coping strategies and adaptive behaviors used to address challenges, and the interdependence of feeding and infant sleep behaviors over time. Findings from this study expand our understanding of dynamic and complex nature of breastfeeding and infant sleep during the early postpartum months. Future interventions, programs, and policy statements to promote breastfeeding and infant safe sleep will be more effective when they address the needs of the mother-infant dyad and consider contextual factors that help or hinder women’s ability to perform these behaviors.
Entangled two photon absorption cross section on the 808 nm region for the common dyes Zinc tetraphenylporphyrin and Rhodamine B
Creators: name: Villabona-Monsalve, Juan. P.
name: Calderón-Losada, Omar
name: Portela, Mayerlin Nuñez
name: Valencia, Alejandra
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report the measurement of the entangled two photon absorption cross section, $σ_E$, at 808 nm on organic chromophores in solution in a low photon flux regime. We performed measurements on Zinc tetraphenylporphyrin (ZnTPP) in Toluene and Rhodamine B (RhB) in Methanol. This is, to the best of our knowledge, the first time that $σ_E$ is measured for RhB. Additionally, we report a systematic study of the dependence of $σ_E$ on the molecular concentration for both molecular systems. In contrast to previous experiments, our measurements are based on detecting the pairs of photons that are transmitted by the molecular system. By using a coincidence count circuit it was possible to improve the signal to noise ratio. This type of work is important for the development of spectroscopic and microscopic techniques using entangled photons.
description: 6 pages, double columm, 4 figures
The Look of Silence: Rape and the Art of Diane Arbus, Adrian Piper, and Ana Mendieta
Creators: name: Davis, Sarah R.
Publisher: name: University of Illinois at Chicago
Year: 2019
Subjects: Uncategorized

description: Rape Culture is complicated; it’s about as much as what is not said and imagined as it is about what is said. It thrives in the silence–the silence of survivors, the silence of people denying its existence, and the silence of people who don’t know how to handle this sensitive topic. It is imagined in what is said; the pervasive behavior of victim blaming, slut-shaming, sexual objectification, or trivializing rape. Each engagement continues to normalize our societal attitudes about gender and sexuality, and Art History is complicit in that normalization. We continue to reproduce rape images through movements like the Renaissance, Rococo, Baroque, Modern, and Contemporary art, which in turns pushes survivors into isolation or risk silencing them forever. This thesis will navigate three women artists, Diane Arbus, Adrian Piper, and Ana Mendieta, to analyze how rape has affected the work of each of these artists. Most importantly, to demonstrate how engrained rape culture is in our society, and how representing images of rape accurately can start a necessary dialogue to combatting rape culture. Diane Arbus was sexually assaulted from the time she was a young child until a few weeks before she committed suicide, Adrian Piper’s work deals with the objectification of violence against White women, and Ana Mendieta depicts explicitly violent rape images. Each artist was silenced in their own way, and I hope to alleviate that silence through this paper; to undermine Art History’s contribution to rape culture and think critically of the depiction of rape. I will argue that images of rape deserve a place in Art History, considering that Art should reflect the world, but it must be done sensitively and accurately. No more objectification or trivializing rape through images–rather, holding Art History accountable for our current state of rape culture, and how we should rectify the wrongdoings of the past.
On the characterization of vector rogue waves in two-dimensional two coupled nonlinear Schrödinger equations with distributed coefficients
Creators: name: Manikandan, K.
name: Senthilvelan, M.
name: Kraenkel, R. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We construct vector rogue wave solutions of the two-dimensional two coupled nonlinear Schrödinger equations with distributed coefficients, namely diffraction, nonlinearity and gain parameters through similarity transformation technique. We transform the two-dimensional two coupled variable coefficients nonlinear Schrödinger equations into Manakov equation with a constraint that connects diffraction and gain parameters with nonlinearity parameter. We investigate the characteristics of the constructed vector rogue wave solutions with four different forms of diffraction parameters. We report some interesting patterns that occur in the rogue wave structures. Further, we construct vector dark rogue wave solutions of the two-dimensional two coupled nonlinear Schrödinger equations with distributed coefficients and report some novel characteristics that we observe in the vector dark rogue wave solutions.
description: Accepted for publication in The European Physical Journal B
"A Jackpot for a Life" by Jim Clark
Creators: name: Clark, Jim
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Ranchers
valueUri: http://id.worldcat.org/fast/1089749
subject: Poker
valueUri: http://id.worldcat.org/fast/1068219
subject: Indigenous peoples
valueUri: http://id.worldcat.org/fast/970213
subject: Colonists
valueUri: http://id.worldcat.org/fast/868479

description: A short story by Jim Clark about conflict between a group of settlers and Indigenous peoples. A game of poker is played by the settlers to determine which one of them will serve as a distraction to save the lives of the other settlers.
On-sky tests of sky-subtraction methods for fiber-fed spectrographs
Creators: name: Rodrigues, Myriam
name: Cirasuolo, Michele
name: Hammer, Francois
name: Royer, Frederic
name: Evans, C. J.
name: Puech, Mathieu
name: Flores, Hector
name: Guinouard, Isabelle
name: Causi, Gianluca Li
name: Disseau, Karen
name: Yang, Yanbin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present preliminary results on on-sky test of sky subtraction methods for fiber-fed spectrograph. Using dedicated observation with FLAMES/VLT in I-band, we have tested the accuracy of the sky subtraction for 4 sky subtraction methods: mean sky, closest sky, dual stare and cross-beam switching. The cross beam-switching and dual stare method reach accuracy and precision of the sky subtraction under 1%. In contrast to the commonly held view in the literature, this result points out that fiber-fed spectrographs are adapted for the observations of faint targets.
Benjamin-Feir instabilities on directed networks
Creators: name: Di Patti, Francesca
name: Fanelli, Duccio
name: Miele, Filippo
name: Carletti, Timoteo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The Complex Ginzburg-Landau equation is studied assuming a directed network of coupled oscillators. The asymmetry makes the spectrum of the Laplacian operator complex, and it is ultimately responsible for the onset of a generalized class of topological instability, reminiscent of the Benjamin-Feir type. The analysis is initially carried out for a specific class of networks, characterized by a circulant adjacency matrix. This allows us to delineate analytically the domain in the parameter space for which the generalized instability occurs. We then move forward to considering the family of non linear oscillators coupled via a generic direct, though balanced, graph. The characteristics of the emerging patterns are discussed within a self-consistent theoretical framework.
The arts and education for justice : theory and practice
Creators: name: Woodward, Margaret
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.
Notebook 23 - [Diary, prose, draft letters 1928-34]
Creators: name: Seel, Else, 1894-1974
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Norddeutscher Lloyd
valueUri: http://id.worldcat.org/fast/552899
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Literature
valueUri: http://id.worldcat.org/fast/999953
subject: Authors, German
valueUri: http://id.worldcat.org/fast/822051
subject: Voyages and travels
valueUri: http://id.worldcat.org/fast/1169308

description: Contents: Ausflug zum Pacific (July 27, 1928) Hazelton [Draft letter to Norddeutscher Lloyd] (March 07, 1929) Tahtsa River [Diary] (September, 19-23, 1933) Draft letters to [Joseph Maria Funk] (September, 18, 1934; November 10, 1934; November 16, 1934; November 18, 1934)
Mongoose dual stressors SM_final from The combined effects of elevated predation risk and anthropogenic noise on dwarf mongoose vigilance behaviour
Creators: name: Westover, Lucy
name: Morris-Drake, Amy
name: Layton, Megan
name: Kern, Julie
name: Arbon, Josh James
name: Radford, Andrew N
Publisher: name: The Royal Society
Year: 2025
Subjects: classificationCode: 310901
subject: Animal behaviour

description: Additional methods and results tables
Anisotropic Elliott-Yafet Theory and Application to KC$_8$ Potassium Intercalated Graphite
Creators: name: Márkus, Bence G.
name: Szolnoki, Lénárd
name: Iván, Dávid
name: Dóra, Balázs
name: Szirmai, Péter
name: Náfrádi, Bálint
name: Forró, László
name: Simon, Ferenc
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report Electron Spin Resonance (ESR) measurements on stage-I potassium intercalated graphite (KC$_8$). Angular dependent measurements show that the spin-lattice relaxation time is longer when the magnetic field is perpendicular to the graphene layer as compared to when the magnetic field is in the plane. This anisotropy is analyzed in the framework of the Elliott-Yafet theory of spin-relaxation in metals. The analysis considers an anisotropic spin-orbit Hamiltonian and the first order perturbative treatment of Elliott is reproduced for this model Hamiltonian. The result provides an experimental input for the first-principles theories of spin-orbit interaction in layered carbon and thus to a better understanding of spin-relaxation phenomena in graphene and in other layered materials as well.
Using Gaussian processes to model light curves in the presence of flickering: the eclipsing cataclysmic variable ASASSN-14ag
Creators: name: McAllister, M. J.
name: Littlefair, S. P.
name: Dhillon, V. S.
name: Marsh, T. R.
name: Ashley, R. P.
name: Bours, M. C. P.
name: Breedt, E.
name: Hardy, L. K.
name: Hermes, J. J.
name: Kengkriangkrai, S.
name: Kerry, P.
name: Rattanasoon, S.
name: Sahman, D. I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The majority of cataclysmic variable (CV) stars contain a stochastic noise component in their light curves, commonly referred to as flickering. This can significantly affect the morphology of CV eclipses and increases the difficulty in obtaining accurate system parameters with reliable errors through eclipse modelling. Here we introduce a new approach to eclipse modelling, which models CV flickering with the help of Gaussian processes (GPs). A parameterised eclipse model - with an additional GP component - is simultaneously fit to 8 eclipses of the dwarf nova ASASSN-14ag and system parameters determined. We obtain a mass ratio $q$ = 0.149 $\pm$ 0.016 and inclination $i$ = 83.4 $^{+0.9}_{-0.6}$ $^{\circ}$. The white dwarf and donor masses were found to be $M_{w}$ = 0.63 $\pm$ 0.04 $M_{\odot}$ and $M_{d}$ = 0.093 $^{+0.015}_{-0.012}$ $M_{\odot}$, respectively. A white dwarf temperature $T_{w}$ = 14000 $^{+2200}_{-2000}$ K and distance $d$ = 146 $^{+24}_{-20}$ pc were determined through multicolour photometry. We find GPs to be an effective way of modelling flickering in CV light curves and plan to use this new eclipse modelling approach going forward.
description: 13 pages, 7 figures, to be published in Monthly Notices of the Royal Astronomical Society (MNRAS)
Insights into the Southern Oklahoma Aulacogen Using Gravity Model Comparisons of the Reelfoot Rift
Creators: name: Gefeke, Kerri Melisa
Publisher: name: University of Illinois at Chicago
Year: 2019
Subjects: Uncategorized

description: The Southern Oklahoma Aulacogen and Reelfoot Rift are Precambrian continental rifts within North America that formed during the same continental breakup ≈560 Ma. These rifts likely underwent similar rifting processes and post-rift subsidence. Today the Reelfoot Rift has been slightly inverted and has a Bouguer gravity low, whereas the Southern Oklahoma Aulacogen has been inverted by 11 km and has a Bouguer gravity high. This study uses gravity modeling to constrain subsurface rift structures to compare the development of these rifts and determine why their gravity profiles are so different. Initially I investigate the gravity effects of sediment-filled rift basins, rift pillows, rift inversion, and lithology. Results confirm that sedimentary basins produce negative gravity anomalies, rift pillows produce positive gravity anomalies, the thickness of each increases the effect, and rift pillow proximity to the surface as controlled by inversions increases the gravity anomaly. I demonstrate that a 5-10 km thick rift pillow could fit the observed gravity anomaly of the Southern Oklahoma Aulacogen. Finally, this study compares the gravity profiles from a 10.5-km uplifted Reelfoot Rift to the current Southern Oklahoma Aulacogen and between a 10.5-km subsided Southern Oklahoma Aulacogen to the current Reelfoot Rift to better understand how these rifts evolved and to further constrain the differences and similarities between these rifts.
The reading of foreign-language literature : response patterns, reading and metacognitive strategies
Creators: name: Willcoxson, Lesley
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.
Dynamical formation of a Reissner-Nordström black hole with scalar hair in a cavity
Creators: name: Sanchis-Gual, Nicolas
name: Degollado, Juan Carlos
name: Herdeiro, Carlos
name: Font, José A.
name: Montero, Pedro J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In a recent letter, we presented numerical relativity simulations, solving the full Einstein--Maxwell--Klein-Gordon equations, of superradiantly unstable Reissner-Nordström black holes (BHs), enclosed in a cavity. Low frequency, spherical perturbations of a charged scalar field, trigger this instability. The system's evolution was followed into the non-linear regime, until it relaxed into an equilibrium configuration, found to be a $\textit{hairy}$ BH: a charged horizon in equilibrium with a scalar field condensate, whose phase is oscillating at the (final) critical frequency. Here, we investigate the impact of adding self-interactions to the scalar field. In particular, we find sufficiently large self-interactions suppress the exponential growth phase, known from linear theory, and promote a non-monotonic behaviour of the scalar field energy. Furthermore, we discuss in detail the influence of the various parameters in this model: the initial BH charge, the initial scalar perturbation, the scalar field charge, mass, and the position of the cavity's boundary (mirror). We also investigate the "explosive" non-linear regime previously reported to be akin to a bosenova. A mode analysis shows that the "explosions" can be interpreted as the decay into the BH of modes that exit the superradiant regime.
Constraints on the Early Terrestrial Surface UV Environment Relevant to Prebiotic Chemistry
Creators: name: Ranjan, Sukrit
name: Sasselov, Dimitar D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The UV environment is a key boundary condition for the origin of life. However, considerable uncertainty exists as to planetary conditions and hence surface UV at abiogenesis. Here, we present two-stream multi-layer clear-sky calculations of the UV surface radiance on Earth at 3.9 Ga to constrain the UV surface fluence as a function of albedo, solar zenith angle (SZA), and atmospheric composition. Variation in albedo and latitude (through SZA) can affect maximum photoreaction rates by a factor of >10.4; for the same atmosphere, photoreactions can proceed an order of magnitude faster at the equator of a snowball Earth than at the poles of a warmer world. Surface conditions are important considerations when computing prebiotic UV fluences. For climatically reasonable levels of CO2, fluence shortward of 189 nm is screened out, meaning that prebiotic chemistry is robustly shielded from variations in UV fluence due to solar flares or variability. Strong shielding from CO2 also means that the UV surface fluence is insensitive to plausible levels of CH4, O2, and O3. At scattering wavelengths, UV fluence drops off comparatively slowly with increasing CO2 levels. However, if SO2 and/or H2S can build up to the 1-100 ppm level as hypothesized by some workers, then they can dramatically suppress surface fluence and hence prebiotic photoprocesses. H2O is a robust UV shield for <198 nm. This means that regardless of the levels of other atmospheric gases, fluence <198 nm is only available for cold, dry atmospheres, meaning sources with emission <198 nm (e.g. ArF eximer lasers) can only be used in simulations of cold environments with low abundance of volcanogenic gases. On the other hand, fluence at 254 nm is unshielded by H2O and is available across a broad range of CO2 columns, meaning that mercury lamps are suitable for initial studies regardless of the uncertainty in primordial H2O and CO2 levels.
description: Accepted to Astrobiology. Preprint format; 3 tables, 29 figures, 95 pages)
Finding PFAS: Data Exchange to Support Suspect and Non-target Screening of PFAS
Creators: name: Schymanski, Emma
Publisher: name: Zenodo
Year: 2023
Subjects: PFAS

description: Invited presentation for the PFAS workshop hosted by BAM, Sept 19 in Berlin / hybrid Advancements of Analytical Techniques for Per- and Polyfluoroalkyl Substances (PFAS) – Second Workshop 2023 https://www.bam.de/Content/EN/Events/2023/2023-09-19-pfas.html Many thanks to Christian Vogel for the invitation! This presentation features a sound track created by Jamie Perera on "Our Chemical Past, Present and Future", which can be downloaded on Vimeo (video) or Soundcloud (sound only). Please leave feedback there if you enjoy it!
Tissue Structure Analysis Using Anomalous Diffusion Signal Decay Models in Magnetic Resonance Imaging
Creators: name: Uyanik, Meltem
Publisher: name: University of Illinois at Chicago
Year: 2019
Subjects: Uncategorized

description: Diffusion magnetic resonance imaging plays a significant role in the study of tissue structures, such as by providing important biological information on prostate cancer and brain tissue complexity. Diffusion MRI contains information describing the isotropy and anisotropy of the diffusion assuming the existence of the Gaussian diffusion, which is referred to as mono-exponential signal decay. Because of the structural heterogeneity and complexity of biological tissues, diffusion is not always Gaussian. Hence, the diffusion signal decay is no longer mono-exponential. In order to investigate the deviation from mono-exponentiality decay many non-Gaussian diffusion models have been developed, such as the bi-exponential, stretched exponential, kurtosis, and fractional order calculus (FROC) models, as well as neurite orientation dispersion and density imaging (NODDI), combined hindered and restricted models of water diffusion (CHARMED), and anomalous diffusion imaging. The goal of this thesis is to show the ability of the anomalous diffusion signal decay models to characterize cellular microstructure on both the prostate and the structured brain tissue.
General phase transition models for vehicular traffic with point constraints on the flow
Creators: name: Santo, Edda Dal
name: Rosini, Massimiliano D.
name: Dymski, Nikodem
name: Benyahia, Mohamed
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We generalize the phase transition model studied in [R. Colombo. Hyperbolic phase transition in traffic flow.\ SIAM J.\ Appl.\ Math., 63(2):708-721, 2002], that describes the evolution of vehicular traffic along a one-lane road. Two different phases are taken into account, according to whether the traffic is low or heavy. The model is given by a scalar conservation law in the \emph{free-flow} phase and by a system of two conservation laws in the \emph{congested} phase. In particular, we study the resulting Riemann problems in the case a local point constraint on the flux of the solutions is enforced.
Quantum-mechanical calculations of cross sections for electron collisions with atoms and molecules
Creators: name: Bartschat, Klaus
name: Tennyson, Jonathan
name: Zatsarinny, Oleg
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: An overview of quantum-mechanical methods to generate cross-section data for electron collisions with atoms and molecules is presented. Particular emphasis is placed on the time-independent close-coupling approach, since it is particularly suitable for low-energy collisions and also allows for systematic improvements as well as uncertainty estimates. The basic ideas are illustrated with examples for electron collisions with argon atoms and methane. For many atomic systems, such as e-Ar collisions, highly reliable cross sections can now be computed with quantified uncertainties. On the other hand, while electron collision calculations with molecules do provide key input data for plasma models, the methods and computer codes presently used require further development to make these inputs robust.
description: in press with Plasma Processes and Polymers
Poetry in context : martyred in the cause of education
Creators: name: Travers, D. Molly
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.
"corrections.tar.gz" of "Study of jets produced in association with a W boson in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector"
Creators: name: ATLAS Collaboration
Publisher: name: HEPData
Year: 2014

description: link to the corrections tables (unpack then view index.html)
description: CERN-LHC. Measurements of cross sections for final states containing a W boson and hadronic jets in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data is from the full 2010 sample with a total integrated luminosity of 36 pb^{-1}. Cross sections are measured in both the electron and muon decay modes of the W and are presented as a function of inclusive jet multiplicity up to five jets. For each multiplicity, cross sections are determined as a function of (1) each jet PT, (2) the scalar sum (HT) of the PT of the charged lepton, missing PT and all jets, (3) the invariant mass of the jets and (4) rapidity distributions of various combinations of leptons and jets. The results are corrected for all detector effects and all known backgrounds. Comparative results are also shown for particle-level predicitions from ALPGEN, SHERPA and BLACKHAT-SHERPA. A separate link gives the Non-Perturbative and QED correction for each table. Note added (26 JUN 2014): The cross section values reported in Tables 1, 3-25, 51, 53-75 below should be multiplied by a factor of 1.0187 to take into account the updated value of the integrated luminosity for the ATLAS 2010 data taking period. The uncertainty on the global normalisation ("Lumi") increases slightly from 3.4% to 3.5%. See Eur.Phys.J. C73 (2013) 2518 for more details.
Adjusting for Bias due to Partially or Fully Unobserved Data
Creators: name: Yiran Hu
Publisher: name: University of Illinois at Chicago
Year: 2019
Subjects: Uncategorized

description: It is a well known fact that incomplete data could lead to efficiency loss in parameter estimation. Examples of incomplete data include when there are not enough data observations to allow valid inferences be drawn from an analysis or when a statistical model is misspecified so that an important covariate is omitted from the analysis model. The assumption that the missing data observations or missing covariate, however, is not verifiable. It is therefore necessary to evaluate the magnitude of bias due to the incomplete or unobserved data and if needed, to properly adjust the parameter estimation for this bias. In this dissertation, we first derived a local sensitivity index formula that can easily approximate the resulting bias of the maximum likelihood estimates in the location-scale model with nonignorable missing outcome data. Then, we developed a local sensitivity index formula that can easily quantify the impact of a potentially unobserved confounder on the maximum likelihood estimates in a generalized linear model setting. Last, we extended this local sensitivity index formula to the survival analysis when the hazard ratio is assumed to be constant over time. We were able to demonstrate the use and effectiveness of these simple formula in reestimating the treatment effect estimates using simulation studies as well as real data applications.
Adjusting for Bias due to Partially or Fully Unobserved Data
Creators: name: Yiran Hu
Publisher: name: University of Illinois at Chicago
Year: 2020
Subjects: Uncategorized

description: It is a well known fact that incomplete data could lead to efficiency loss in parameter estimation. Examples of incomplete data include when there are not enough data observations to allow valid inferences be drawn from an analysis or when a statistical model is misspecified so that an important covariate is omitted from the analysis model. The assumption that the missing data observations or missing covariate, however, is not verifiable. It is therefore necessary to evaluate the magnitude of bias due to the incomplete or unobserved data and if needed, to properly adjust the parameter estimation for this bias. In this dissertation, we first derived a local sensitivity index formula that can easily approximate the resulting bias of the maximum likelihood estimates in the location-scale model with nonignorable missing outcome data. Then, we developed a local sensitivity index formula that can easily quantify the impact of a potentially unobserved confounder on the maximum likelihood estimates in a generalized linear model setting. Last, we extended this local sensitivity index formula to the survival analysis when the hazard ratio is assumed to be constant over time. We were able to demonstrate the use and effectiveness of these simple formula in reestimating the treatment effect estimates using simulation studies as well as real data applications.
Time-Dependent Tomographic Reconstruction of the Solar Corona
Creators: name: Vibert, Didier
name: Peillon, Christelle
name: Lamy, Philippe
name: Frazin, Richard A.
name: Wojak, Julien
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Solar rotational tomography (SRT) applied to white-light coronal images observed at multiple aspect angles has been the preferred approach for determining the three-dimensional (3D) electron density structure of the solar corona. However, it is seriously hampered by the restrictive assumption that the corona is time-invariant which introduces significant errors in the reconstruction. We first explore several methods to mitigate the temporal variation of the corona by decoupling the "fast-varying" inner corona from the "slow-moving" outer corona using multiple masking (either by juxtaposition or recursive combination) and radial weighting. Weighting with a radial exponential profile provides some improvement over a classical reconstruction but only beyond 3 Rsun. We next consider a full time-dependent tomographic reconstruction involving spatio-temporal regularization and further introduce a co-rotating regularization aimed at preventing concentration of reconstructed density in the plane of the sky. Crucial to testing our procedure and properly tuning the regularization parameters is the introduction of a time-dependent MHD model of the corona based on observed magnetograms to build a time-series of synthetic images of the corona. Our procedure, which successfully reproduces the time-varying model corona, is finally applied to a set of of 53 LASCO-C2 pB images roughly evenly spaced in time from 15 to 29 March 2009. Our procedure paves the way to a time-dependent tomographic reconstruction of the coronal electron density to the whole set of LASCO-C2 images presently spanning 20 years.
description: 24 pages, 18 figures
Relaxation of a Simulated Lipid Bilayer Vesicle Compressed by an AFM
Creators: name: Barlow, Ben M.
name: Bertrand, Martine
name: Joos, Béla
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Using Coarse-Grained Molecular Dynamics simulations, we study the relaxation of bilayer vesicles, uniaxially compressed by an Atomic Force Microscope (AFM) cantilever. The relaxation time exhibits a strong force-dependence. Force-compression curves are very similar to recent experiments wherein giant unilamellar vesicles were compressed in a nearly identical manner.
description: accepted in Physical Review E (2016)
Insights into Electrochemical Reactions in High Voltage Electrode Materials for Li Ion Batteries
Creators: name: Lapping, Jacob G
Publisher: name: University of Illinois at Chicago
Year: 2019
Subjects: Uncategorized

description: High voltage batteries are commercially attractive because they lead to high energy densities. LiCoPO4 is one such promising electrode material owing to its high theoretical energy density and low cost. Despite the promising upside, LiCoPO4 has failed to penetrate the market due to fading of storage capacity that arises during electrochemical cycling. To address this problem, ion substitution of Co by other metals (such as Fe, Mn, Cr) has been utilized to improve electrochemical performance without sacrificing energy density. The mechanism behind the drastic electrochemical improvements is revealed through a spectroscopic study on how ion substitution affects the electronic structure at both the surface and bulk of the electrode. The bulk crystallographic changes that take place in LiCoPO4 and ion substituted derivatives during electrochemical cycling are also discussed based on operando x-ray diffraction data. Dual graphite batteries are also explored as high voltage, environmentally friendly, alternatives to conventional Li ion batteries. The electronic and structural changes that take place within a graphite electrode during anion intercalation are discussed. Spectroscopic techniques sensitive to the electrode bulk and surface show intercalation coincides with a lowering of the Fermi level and the generation of new unoccupied states in the graphite electronic structure.
Planned curriculum change : a social networks analysis
Creators: name: Toomey, Ron
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.