cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Self-organization of primitive metabolic cycles due to non-reciprocal interactions
Creators: name: Ouazan-Reboul, Vincent
name: Agudo-Canalejo, Jaime
name: Golestanian, Ramin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We study analytically and numerically a model metabolic cycle composed of an arbitrary number of species of catalytically active particles. Each species converts a substrate into a product, the latter being used as the substrate by the next species in the cycle. Through a combination of catalytic activity and chemotactic mobility, the active particles develop effective non-reciprocal interactions with particles belonging to neighbouring species in the cycle. We find that such model metabolic cycles are able to self-organize through a macroscopic instability, with a strong dependence on the number of species they incorporate. The parity of that number has a key influence: cycles containing an even number of species are able to minimize repulsion between their component particles by aggregating all even-numbered species in one cluster, and all odd-numbered species in another. Such a grouping is not possible if the cycle contains an odd number of species, which can lead to oscillatory steady states in the case of chasing interactions.
DiffFlow: Differentiating Short and Long Flows for Load Balancing in Data Center Networks
Creators: name: Carpio, Francisco
name: Engelmann, Anna
name: Jukan, Admela
Publisher: name: arXiv
Year: 2016
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In current Data Center Networks (DCNs), Equal- Cost MultiPath (ECMP) is used as the de-facto routing protocol. However, ECMP does not differentiate between short and long flows, the two main categories of flows depending on their duration (lifetime). This issue causes hot-spots in the network, affecting negatively the Flow Completion Time (FCT) and the throughput, the two key performance metrics in data center networks. Previous work on load balancing proposed solutions such as splitting long flows into short flows, using per-packet forwarding approaches, and isolating the paths of short and long flows. We propose DiffFlow, a new load balancing solution which detects long flows and forwards packets using Random Packet Spraying (RPS) with help of SDN, whereas the flows with small duration are forwarded with ECMP by default. The use of ECMP for short flows is reasonable, as it does not create the out-of-order problem; at the same time, RPS for long flows can efficiently help to load balancing the entire network, given that long flows represent most of the traffic in DCNs. The results show that our DiffFlow solution outperforms both the individual usage of either RPS or ECMP, while the overall throughput achieved is maintained at the level comparable to RPS.
title: The Flesh Talk: An Exploration of Mental Health Stigma in Chinese Culture
Creators: name: Chen, Qinya (Aria)
Publisher: name: Emily Carr University of Art and Design
Year: 2021
Subjects: subject: Mental health
valueUri: https://id.loc.gov/authorities/subjects/sh85083615
subject: Stigma (Social psychology)
valueUri: https://id.loc.gov/authorities/subjects/sh85128107

description: A pursuit of the philosophy of He (harmony), rooting from the highly relational nature of Chinese traditional socio-cultural conditions, has been deeply embedded in Chinese language, social norms, and family education. In a discursive environment where mental well-being is partly perceived as a communal issue, open discussions of mental distress are morally constrained to a certain extent. Throughout history, reference to mental well-being has therefore been somatized in the Chinese language. These limits open conversations, and inhibits the process for seeking help if it is needed. In my research, I developed a group of discursive objects and scenarios to bring forward and expose embedded and somatized expressions of mental distress in Chinese culture. How might discursive artifacts shift the discourse and stigma around mental illness? Can discursive artifacts challenge the somatized language used in Chinese culture, to lead to a more open conversation about emotions and mental well-being? These are the main inquiries of the project.
3D seismic geomorphology of the late quaternary fluvial to deltaic depositional systems within a source-to-sink framework of the central Sarawak, Malaysia
Creators: name: Mat Yusoff, Habibah Hanan
Publisher: name: Imperial College London
Year: 2022

description: Source-to-sink studies determine the source areas, transport and depositional environments of sedimentary systems under evaluation, but are often incomplete. However, this study of the Late Quaternary of Central Sarawak (NW Borneo) provides an opportunity to investigate a relatively complete source-to-sink system, based on extensive 3D seismic data, high-resolution 2D seismic data and borehole data, most notably on seismic facies and lithofacies properties, from shallow (mainly < 200 m below seabed) site surveys. Seismic stratigraphic methods have defined the morphology and stratigraphic architecture of ca. 200 – 350 km-long incised valleys. The valley mouths terminated in two types of deltas: (i) shelf deltas, and (ii) shelf-edge deltas. The resulting LGM paleogeography map comprised a ca. 360 km long source-to-sink system, extending from the continental drainage divide (presently at ca. 1,500 m elevation) to the basin floor of the NW Borneo Trough (presently ca. 2,500 m deep) and was characterised by the following elements: (i) multiple palaeo-drainages and incised valleys in the source area (i.e., hinterland Sarawak, inner shelf), (ii) a shelfal area characterised by a network of mainly northward-flowing rivers within incised valleys, (iii) shelf deltas and shelf-edge deltas immediately downstream of valley mouths, (iv) canyons, channels and gullies along the upper slope, and (v) basin-floor fans in the sink area. The total palaeo-drainage area of the study area was only ca. 60,000 km2, reflecting the narrow shelf width and short river lengths. The sediment budget estimations revealed an inversely proportional relationship between sediment storage on the continental shelf and sediment bypass to the deep-water. This thesis demonstrates that a complete source-to-sink reconstruction allows for observing fluvial to deltaic variations and understanding siliciclastic sediment pathways for the recently uplifted, humid-tropical climate, and tectonically-influenced shelf-edge of NW Borneo.
Nonequilibrium Fractional Josephson Effect
Creators: name: Lahiri, Aritra
name: Choi, Sang-Jun
name: Trauzettel, Björn
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Josephson tunnel junctions exhibit a supercurrent typically proportional to the sine of the superconducting phase difference $ϕ$. In general, a term proportional to $\cos(ϕ)$ is also present, alongside microscopic electronic retardation effects. We show that voltage pulses sharply varying in time prompt a significant impact of the $\cos(ϕ)$ term. Its interplay with the $\sin(ϕ)$ term results in a nonequilibrium fractional Josephson effect (NFJE) $\sim\sin(ϕ/2)$ in the presence of bound states close to zero frequency. Our microscopic analysis reveals that the interference of non-equilibrium virtual quasiparticle excitations is responsible for this phenomenon. We also analyse this phenomenon for topological Josephson junctions with Majorana bound states. Remarkably, the NFJE is independent of the ground state fermion parity unlike its equilibrium counterpart.
Dynamical and chemical evolution of the thin disc
Creators: name: Just, Andreas
name: Rybizki, Jan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Our detailed analytic local disc model (JJ-model) quantifies the interrelation between kinematic properties (e.g. velocity dispersions and asymmetric drift), spatial parameters (scale-lengths and vertical density profiles), and properties of stellar sub-populations (age and abundance distributions). Any consistent radial extension of the disc evolution model should predict specific features in the different distribution functions and in their correlations. Large spectroscopic surveys (SEGUE, RAVE, APOGEE, Gaia-ESO) allow significant constraints on the long-term evolution of the thin disc. We discuss the qualitative difference of correlations (like the alpha-enhancement as function of metallicity) and distribution functions (e.g. in [Mg/H] or [Fe/H]) for the construction of a disc model. In the framework of the JJ-model we build a local chemical enrichment model and show that significant vertical gradients for main sequence and red clump stars are expected in the thin disc. A Jeans analysis of the asymmetric drift provides a link to the radial structure of the disc. The derived metallicity-dependent radial scale-lengths can be combined in the future with the abundance distributions at different Galactocentric distances to construct full disc models. We expect to be able to constrain possible scenarios of inside-out growth of the thin disc and to characterise those populations, which require significant radial migration.
description: 5 pages, 6 figures, to appear in Astronomische Nachrichten, special issue "Reconstruction the Milky Way's History: Spectroscopic surveys, Asteroseismology and Chemo-dynamical models", Guest Editors C. Chiappini, J. Montalb\'an, and M. Steffen, AN 2016 (in press)
Operator correlations in a quenched non-Hermitian Luttinger liquid
Creators: name: Dubey, Ashutosh
name: Biswas, Sourav
name: Kundu, Arijit
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study operator correlations of a spinful Luttinger liquid after introducing a non-Hermitian interaction quench, yielding supersonic modes and dominant superconducting correlations as signatures of the non-unitary dynamics as well as spin-charge separation. A comparative analysis with the Hermitian counterpart, i.e, when the quench is Hermitian, shows a significant difference in the behavior of the model. We derive exact expressions for different operator correlations and show that the superconducting correlations decay slower than the charge and spin-density wave correlations, especially, within the short-time limit, and at the long-time limit all the operator correlations merge differed only by phase factors in the case of non-hermitian interaction quench whereas they do not merge in the case of Hermitian interaction quench. In both cases known Luttinger liquid universality is retained at the long time limit. We also analyze how the dynamics of operator correlations vary in the presence of anisotropy in the quenching parameters.
description: 15 pages, comments welcome
Investigations into protein conformational changes in hydrophobic interaction environments
Creators: name: Wang., Yeqiu
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.
Describing two-mode squeezed-light experiments without two-mode entanglement or squeezing
Creators: name: Calixto, Tamíris R.
name: Saldanha, Pablo L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In a recent work [Phys. Rev. A \textbf{102}, 053723 (2020)] we have shown that experiments that produce and characterize single-mode light squeezing can be explained in a way where no single-mode squeezed light state is produced in the setup. Here we apply the same ideas to demonstrate that experiments that produce and characterize two-mode light squeezing can also be explained without the production of two-mode squeezed light states. In particular, we show that there is no entanglement between the signal and idler ``twin beam'' modes. This fact may be surprising, since this setup is frequently used to implement entangled-based quantum information protocols such as quantum teleportation. Our work brings an alternative view of the phenomenon. We generalize the Luis and Sánchez-Soto's two-mode relative phase distribution [Phys. Rev. A \textbf{53}, 495 (1996)] to treat four modes, showing that a general physical explanation for the noise reduction in the experiments is a better definition of a phase relation among the four involved optical modes: Signal, idler, and two local oscillators.
description: 7 pages, 3 figures; v2: Minor changes in the text
Anisotropic solutions in f(R) Gravity
Creators: name: Tripathy, S K
name: Mishra, B
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Anisotropic cosmological models are investigated in the frame work of $f(R)$ gravity in the metric formalism. Plane symmetric models are considered to incorporate anisotropy in the expansion rates along different spatial directions. The anisotropy in expansion rates are assumed to be maintained throughout the cosmic evolution. Two accelerating models are constructed by considering different functional forms for f(R). The viability of these models are tested through a stability analysis.
description: 15pages
Immunochemical studies of merozoite surface protein 4 of Plasmodium falciparum
Creators: name: Wang., Lina
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.
Experimental verification of band convergence in Sr and Na codoped PbTe
Creators: name: Hattori, Yuya
name: Yoshizawa, Shunsuke
name: Sagisaka, Keisuke
name: Tokumoto, Yuki
name: Edagawa, Keiichi
name: Konoike, Takako
name: Uji, Shinya
name: Terashima, Taichi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Scanning tunneling microscopy and transport measurements have been performed to investigate the electronic structure and its temperature dependence in heavily Sr and Na codoped PbTe, which is recognized as one of the most promising thermoelectric materials. Our main findings are as follows: (i) Below T=4.5 K, all carriers are distributed in the first valence band at the L point (L band), which forms tube-shaped Fermi surfaces with concave curvature. With Sr and Na doping, the dispersion of the L band changes, and the band gap increases from 200 meV to 300 meV. (ii) At T=4.5 K, the Fermi energy is located ~100 meV below the edge of the L band for the Sr/Na codoped PbTe. The second valence band at the Sigma point (Sigma band) is lower than the L band by 150 meV, which is significantly smaller than that of pristine PbTe (200 meV). The decrease in the band offset, leading to band convergence, provides a desirable condition for thermoelectric materials.(iii) With increasing temperature, the carrier distribution to the Sigma band starts at T=100 K and we estimate that about 50 percent of the total carriers are redistributed in the Sigma band at T=300 K.Our work demonstrates that scanning tunneling microscopy and angular dependent magnetoresistance measurements are particularly powerful tools to determine the electronic structure and carrier distribution. We believe that they will provide a bird's eye view of the doping strategy towards realizing high-efficiency thermoelectric materials.
description: 36+12 pages, 4+9 figures, including Supplementary Materials
TouchSignatures: Identification of User Touch Actions and PINs Based on Mobile Sensor Data via JavaScript
Creators: name: Mehrnezhad, Maryam
name: Toreini, Ehsan
name: Shahandashti, Siamak F.
name: Hao, Feng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Conforming to W3C specifications, mobile web browsers allow JavaScript code in a web page to access motion and orientation sensor data without the user's permission. The associated risks to user security and privacy are however not considered in W3C specifications. In this work, for the first time, we show how user security can be compromised using these sensor data via browser, despite that the data rate is 3 to 5 times slower than what is available in app. We examine multiple popular browsers on Android and iOS platforms and study their policies in granting permissions to JavaScript code with respect to access to motion and orientation sensor data. Based on our observations, we identify multiple vulnerabilities, and propose TouchSignatures which implements an attack where malicious JavaScript code on an attack tab listens to such sensor data measurements. Based on these streams, TouchSignatures is able to distinguish the user's touch actions (i.e., tap, scroll, hold, and zoom) and her PINs, allowing a remote website to learn the client-side user activities. We demonstrate the practicality of this attack by collecting data from real users and reporting high success rates using our proof-of-concept implementations. We also present a set of potential solutions to address the vulnerabilities. The W3C community and major mobile browser vendors including Mozilla, Google, Apple and Opera have acknowledge our work and are implementing some of our proposed countermeasures.
IBIA: An Incremental Build-Infer-Approximate Framework for Approximate Inference of Partition Function
Creators: name: Bathla, Shivani
name: Vasudevan, Vinita
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Exact computation of the partition function is known to be intractable, necessitating approximate inference techniques. Existing methods for approximate inference are slow to converge for many benchmarks. The control of accuracy-complexity trade-off is also non-trivial in many of these methods. We propose a novel incremental build-infer-approximate (IBIA) framework for approximate inference that addresses these issues. In this framework, the probabilistic graphical model is converted into a sequence of clique tree forests (SCTF) with bounded clique sizes. We show that the SCTF can be used to efficiently compute the partition function. We propose two new algorithms which are used to construct the SCTF and prove the correctness of both. The first is an algorithm for incremental construction of CTFs that is guaranteed to give a valid CTF with bounded clique sizes and the second is an approximation algorithm that takes a calibrated CTF as input and yields a valid and calibrated CTF with reduced clique sizes as the output. We have evaluated our method using several benchmark sets from recent UAI competitions and our results show good accuracies with competitive runtimes.
description: Pages: 24(main) 3(references) 4(appendix), Figures: 5, Tables: 7
Polymer-based 3-D printing of G-band metal-pipe rectangular waveguide components
Creators: name: Payapulli, Roshan Suresh
Publisher: name: Imperial College London
Year: 2023

description: The objective of this thesis is to investigate the use of low-cost polymer-based 3-D printing for G-band (140 to 220 GHz) metal-pipe rectangular waveguide (MPRWG) components. First, various preliminary designs are investigated. Then, a successful ‘trough-and-lid’ assembly is demonstrated, which mitigates against the main design challenges for split-block waveguide construction at upper-millimeter-wave frequencies (ca. 100 GHz to 300 GHz), and can be realized using low-cost 3-D printing and conventional metal plating techniques. With this assembly, inexpensive masked stereolithographic apparatus (MSLA) 3-D printers and a standard commercial copper electroplating service are used. The trough-and-lid assembly is expected to provide a standard solution for the low-cost and low loss realization of most MPRWG implementations above 100 GHz; previously, this was infeasible without the use of high-cost, state-of-the-art 3-D printing and/or custom-developed metal plating techniques. Three different component types are successfully demonstrated: (i) straight thru lines; (ii) 90° twists; and (iii) bandpass filters (BPFs). Along with frequency-domain S-parameter measurements, a detailed time-domain reflectometry analysis is also included. For the more accurate characterization of these components, the additional insertion loss due to conductor surface roughness is investigated. Finally, the integration of an MPRWG component into a millimeter-wave subsystem, which is based on the design of a radiometer front-end, is presented.
Zeta-Funktionen in der Physik - eine Einführung
Creators: name: Schiekel, Bernhard
Publisher: name: Universität Ulm
Year: 2011
Subjects: subject: Wärmekern
subject: DDC 530 / Physics
subject: Functions, zeta
subject: Regularisierung
subject: Renormierung
subject: Zetafunktion

description: "Zetafunctions in Physics - an Introduction" is an introductory monograph about Riemann-Zetafunction, Spectral Zetafunctions and Dynamical Zetafunctions in Physics on an advanced undergraduate level. Topics are: harmonic oszillator (not much surprising), phase operators and coherent states, pathintegrals of single- and many-particle systems, regularization with Spectral Zetafunction and Casimir-effect, heat-kernel-expansion and regularization and renormalization of the Phi(4,4)-theory in 1-loop approximation, Dynamical or Ruelle Zetafunctions in dynamical systems and Gutzwillers traceformula. Mathematical appendices deal with: Gammafunction, Riemann-Zetafunction, Mellin-transformation, asymptotic expansions, heat-kernel-expansion and (analytic) index-theorem for elliptic differential operators, Fredholm-theory of elliptic pseudo-differential operators. Due to the didactic intention of this introduction all proofs are worked out in details. So, enjoy yourself!
Application of the Multi-Peaked Analytically Extended Function to Representation of Some Measured Lightning Currents
Creators: name: Lundengård, Karl
name: Rančić, Milica
name: Javor, Vesna
name: Silvestrov, Sergei
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: A multi-peaked form of the analytically extended function (AEF) is used for approximation of lightning current waveforms in this paper. The AEF function's parameters are estimated using the Marquardt least-squares method (MLSM), and the general procedure for fitting the $p$-peaked AEF function to a waveform with an arbitrary (finite) number of peaks is briefly described. This framework is used for obtaining parameters of 2-peaked waveforms typically present when measuring first negative stroke currents. Advantages, disadvantages and possible improvements of the approach are also discussed.
description: 11 pages, 6 figures
Network effects lead to self-organization in metabolic cycles of self-repelling catalysts
Creators: name: Ouazan-Reboul, Vincent
name: Golestanian, Ramin
name: Agudo-Canalejo, Jaime
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Mixtures of particles that interact through phoretic effects are known to aggregate if they belong to species that exhibit attractive self-interactions. We study self-organization in a model metabolic cycle composed of three species of catalytically-active particles that are chemotactic towards the chemicals that define their connectivity network. We find that the self-organization can be controlled by the network properties, as exemplified by a case where a collapse instability is achieved by design for self-repelling species. Our findings highlight a possibility for controlling the intricate functions of metabolic networks by taking advantage of the physics of phoretic active matter.
description: Movies are available as ancillary files. Fixed rendering error in Fig. 2
High quality beam produced by tightly focused laser driven wakefield accelerators
Creators: name: Wang, Jia
name: Zeng, Ming
name: Li, Dazhang
name: Wang, Xiaoning
name: Gao, Jie
Publisher: name: arXiv
Year: 2023
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We propose to use tightly focused lasers to generate high quality electron beams in laser wakefield accelerators. In this scheme, the expansion of the laser beam after the focal position enlarges the size of wakefield bubble, which reduces the effective phase velocity of the wake and triggers injection of plasma electrons. This scheme injects a relatively long beam with high charge. The energy spread of the injected beam can be minimized if an optimal acceleration distance is chosen so that the beam chirp is suppressed. Particle-in-cell simulations indicate that electron beams with the charge in the order of nanocoulomb, the energy spread of $\sim 1\%$, and the normalized emittance of $\rm \sim 0.1\ mm\cdot mrad$ can be generated in uniform plasma using $\sim 100\ \rm TW$ laser pulses. An empirical formula is also given for predicting the beam charge. This injection scheme, with a very simple setup, paves the way towards practical high-quality laser wakefield accelerators for table-top electron and radiation sources.
description: 7 pages, 9 figures
Antiviral strategies for chronic hepatitis B infection
Creators: name: Wang., Yanyan
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.
The Doi-Peliti field theory of run-and-tumble and active Brownian particles
Creators: name: Zhang, Ziluo
Publisher: name: Imperial College London
Year: 2022

description: In this thesis, I use Doi-Peliti field theory to describe a range of active matter systems and calculate their entropy production. The topics in this thesis are presented from the easier model to the more complicated model. In Chapter 2, I use the field theory to calculate the stationary density of a drift-diffusive particle in an external potential and compare the result with the well-known analytic solution. Here I show a basic route to study active matter via field theory, even though this process is already well studied. In Chapter 3, I show the propagator, mean-squared displacement and entropy production of run-and-tumble particles in d dimensions. In Chapter 4, I use field theory and introduce a corresponding eigensystem to obtain the propagator of active Brownian particles in 2 and 3 dimensions and calculate their entropy production. In Chapter 5, I extend our field theoretic framework to include interaction, calculate their correlation function and entropy production perturbatively, and compare the theory with numerical results. Finally, in Chapter 6, I discuss the main results of this thesis and present the open questions for further work.
title: A Theoretical Exploration Of Consciousness
Creators: name: Green, Sarah
Publisher: name: Emily Carr University of Art and Design
Year: 2021
Subjects: subject: Painting
valueUri: https://id.loc.gov/authorities/subjects/sh85096661
subject: Art and science
valueUri: https://id.loc.gov/authorities/subjects/sh85007974
subject: Narrative art
valueUri: https://id.loc.gov/authorities/subjects/sh85089836
subject: Physics
valueUri: https://id.loc.gov/authorities/subjects/sh85101653

description: The following paper is a two-part document of research. I process information best through the use of metaphor and narrative, so in order to tackle the complicated, analytical research of unpacking consciousness and the nature of death in relation to my work, it felt necessary to open with the short story that is behind my visual thesis. The heady concepts of physics and the winding history of different theories of consciousness, be they in art or science, informed the short story, which then informed my paintings and prints. All three—the visual works, the narrative, the research—are different iterations of the same exploration. It would feel disingenuous to not present each one as a sum and a part of the whole, as they are intrinsically linked and inform one another.
Analyzing the neutron and $γ$-ray emission properties of an americium-beryllium tagged neutron source
Creators: name: Ito, Hiroshi
name: Wada, Kohei
name: Yano, Takatomi
name: Hino, Yota
name: Ommura, Yuga
name: Harada, Masayuki
name: Minamino, Akihiro
name: Ishitsuka, Masaki
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Americium-beryllium (AmBe), a well-known tagged neutron source, is commonly used for evaluating the neutron detection efficiency of detectors used in ultralow background particle physics experiments, such as reactor neutrino and diffuse supernova neutrino background experiments. In particular, AmBe sources are used to calibrate neutron tagging by selecting the 4438-keV $γ$-ray signal, which is simultaneously emitted with a neutron signal. Therefore, analyzing the neutron and $γ$-ray emission properties of AmBe sources is crucial. In this study, we used the theoretical shape of a neutron energy spectrum, which was divided into three parts, to develop models of the energy spectrum and verify the results using experimental data. We used an AmBe source to measure the energy spectra of simultaneously emitted neutrons and $γ$-rays and determine the emission ratio of the neutrons with and without $γ$-ray emission. The measured spectrum was consistent with that obtained from the simulated result, whereas the measured emission ratio was significantly different from the corresponding simulated result. Here, we also discuss the feasibility of determining the neutron emission rates from the spectra divided into three parts.
description: 9 pages, 11 figures, 2 tables
No Tension: JWST Galaxies at $z > 10$ Consistent with Cosmological Simulations
Creators: name: McCaffrey, Joe
name: Hardin, Samantha
name: Wise, John
name: Regan, John
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recent observations by JWST have uncovered galaxies in the very early universe via the JADES and CEERS surveys. These galaxies have been measured to have very high stellar masses with substantial star formation rates. There are concerns that these observations are in tension with the $Λ$CDM model of the universe, as the stellar masses of the galaxies are relatively high for their respective redshifts. Recent studies have compared the JWST observations with large-scale cosmological simulations. While they were successful in reproducing the galaxies seen in JADES and CEERS, the mass and spatial resolution of these simulations were insufficient to fully capture the early assembly history of the simulated galaxies. In this study, we use results from the Renaissance simulations, which are a suite of high resolution simulations designed to model galaxy formation in the early universe. We find that the most massive galaxies in Renaissance have stellar masses and star formation rates that are entirely consistent with the observations from the JADES and CEERS surveys. The exquisite resolution afforded by Renaissance allows us to model the build-up of early galaxies from stellar masses as low as 10$^4$ M$_\odot$ up to a maximum stellar mass of a few times 10$^{7}$ M$_\odot$. Within this galaxy formation paradigm, we find excellent agreement with JADES and CEERS. We find no tension between the $Λ$CDM model and current JWST measurements. As JWST continues to explore the high redshift universe, high resolution simulations, such as Renaissance, will continue to be crucial in understanding the formation history of early embryonic galaxies.
description: 9 pages, 5 figures. Accepted for Publication in The Open Journal of Astrophysics
Optical spectroscopy of SDSS J004054.65-0915268: three possible scenarios for the classification. A z \sim 5 BL Lacertae, blue FSRQ or a weak emission line quasar
Creators: name: Landoni, M.
name: Zanutta, A.
name: Bianco, A.
name: Tavecchio, F.
name: Bonnoli, G.
name: Ghisellini, G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The haunt of high redshift BL Lacerate objects is day by day more compelling, to firmly understand their intrinsic nature and evolution. SDSS J004054.65-0915268 is, at the moment, one of the most distant BL Lac candidate at z \sim 5 (Plotkin et al 2010). We present a new optical-near IR spectrum obtained with ALFOSC-NOT with a new, custom designed dispersive grating aimed to detect broad emission lines that could disprove this classification. In the obtained spectra we do not detect any emission features and we provide an upper limit to the luminosity of the C IV broad emission line. Therefore, the nature of the object is then discussed, building the overall spectral energy distribution and fitting it with three different models. Our fits, based on the SED modeling with different possible scenarios, cannot rule out the possibility that this source is indeed a BL Lac object although, the absence of optical variability and lack of strong radio flux, they seems to suggest that the observed optical emission originate from a thermalized accretion disk.
description: (18 pages, 5 figures) - Accepted for publication in Astronomical Journal
Mechanism of action of inhibin and follicle-stimulating hormone-suppressing protein on gonadotrophin synthesis and secretion
Creators: name: Wang., Qi-Fa
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.
The worldline approach to helicity flip in plane waves
Creators: name: Ilderton, Anton
name: Torgrimsson, Greger
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We apply worldline methods to the study of vacuum polarisation effects in plane wave backgrounds, in both scalar and spinor QED. We calculate helicity-flip probabilities to one loop order and treated exactly in the background field, and provide a toolkit of methods for use in investigations of higher-order processes. We also discuss the connections between the worldline, S-matrix, and lightfront approaches to vacuum polarisation effects.
description: 11 pages, 1 figure
Higher spin representations of K(E10)
Creators: name: Kleinschmidt, Axel
name: Nicolai, Hermann
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the recently constructed non-trivial fermionic representations of the infinite-dimensional subalgebra K(E10) of the hyperbolic Kac--Moody algebra E10. These representations are all unfaithful (and more specifically, of finite dimension). In addition we present their decompositions under the various finite-dimensional subgroups associated with some maximal supergravities in dimensions D<=11, and the projectors for `spin-7/2' which have not been given before. Those representations that have not been derived from supergravity still have to find a role and a proper physical interpretation in the conjectured correspondence between E10 and M-theory. Nevertheless, they provide novel mathematical structures that could shed some light on fundamental questions in supergravity and on the possible role of K(E10) as an `R-symmetry' of M-theory, and perhaps also on the algebra E10 itself.
description: 15 pages. Contribution to the proceedings of the "International Workshop on Higher Spin Gauge Theories", Singapore 4-6 November 2015
Accurate determination of the valence band edge in hard x-ray photoemission spectra using GW theory
Creators: name: Lischner, Johannes
name: Nemsak, Slavomir
name: Conti, Giuseppina
name: Gloskovskii, Andrei
name: Palsson, Gunnar Karl
name: Schneider, Claus M.
name: Drube, Wolfgang
name: Louie, Steven G.
name: Fadley, Charles
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We introduce a new method for determining accurate values of the valence-band maximum in x-ray photoemission spectra. Specifically, we align the sharpest peak in the valence-band region of the experimental spectrum with the corresponding feature of a theoretical valence-band density of states curve from ab initio GW theory calculations. This method is particularly useful for soft and hard x-ray photoemission studies of materials with a mixture of valence-band characters, where strong matrix element effects can render standard methods for extracting the valence-band maximum unreliable. We apply our method to hydrogen-terminated boron-doped diamond, which is a promising substrate material for novel solar cell devices. By carrying out photoemission experiments with variable light polarizations, we verify the accuracy of our analysis and the general validity of the method.
description: 15 pages, 7 figures, accepted for publication in Journal of Applied Physics
Subsampling for renewable electricity system optimisation
Creators: name: Hilbers, Adriaan
Publisher: name: Imperial College London
Year: 2022

description: Decarbonisation efforts are making power (electricity) systems - which require a continuous matching of supply and demand across time and throughout a network known as the grid - increasingly weather-dependent. Historically, this balance was maintained by adjusting dispatchable (mostly fossil fuel) generation. However, as fossil fuels are displaced by weather-dependent renewables such as solar and wind, neither supply nor demand can be fully controlled. This complicates the maintenance of supply-demand balance, known informally as "keeping the lights on". Power system planning models are simplified representations of electricity systems used to inform investment strategy, such as whether to build a wind farm, solar farm, gas plant, transmission line or battery. They involve an optimisation problem that minimises the sum of install and subsequent operation costs. Their outputs depend on demand and weather patterns, which enter the model as time series of e.g. demand levels, wind speeds and solar irradiances. The use of relatively short demand and weather time series (e.g. a single year) in power system planning studies has recently been criticised. This is because many conclusions - such as whether a 100% renewable power system is feasible and affordable - depend on the choice of sample; picking an unrepresentative one provides an unrealistic impression of cost or reliability. At the same time, computing resources usually prevent the consideration of longer samples, since planning problems take too much time or memory to solve. In this thesis, we introduce subsampling methods to reduce and quantify the impact of demand and weather sampling uncertainty in power system planning models. Our algorithms compress long time series into shorter data sets - enhancing computational efficiency - and provide uncertainty bounds on model outputs. They help prevent incorrect conclusions by (1) allowing the consideration of larger amounts of data, reducing sampling uncertainty, and (2) indicating to users whether their outputs are statistically robust or a result of the particular demand and weather sample. We combine and extend techniques from the power systems, statistics and optimisation literature. This is because power system planning models involve optimisation problems solved across demand and weather time series, which we view - as is common in statistics - as samples from an underlying distribution. Our contributions are statistical subsampling methods, such as importance sampling and the bootstrap, adapted to power system optimisation problems.
Angiotensin peptides : cardiovascular function in hypertension
Creators: name: Walters., Pia
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.
Dynamic vibronic coupling in InGaAs quantum dots
Creators: name: Brash, A. J.
name: Martins, L. M. P. P.
name: Barth, A. M.
name: Liu, F.
name: Quilter, J. H.
name: Glassl, M.
name: Axt, V. M.
name: Ramsay, A. J.
name: Skolnick, M. S.
name: Fox, A. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electron-phonon coupling in self-assembled InGaAs quantum dots is relatively weak at low light intensities, which means that the zero-phonon line in emission is strong compared to the phonon sideband. However, the coupling to acoustic phonons can be dynamically enhanced in the presence of an intense optical pulse tuned within the phonon sideband. Recent experiments have shown that this dynamic vibronic coupling can enable population inversion to be achieved when pumping with a blue-shifted laser and for rapid de-excitation of an inverted state with red detuning. In this paper we confirm the incoherent nature of the phonon-assisted pumping process and explore the temperature dependence of the mechanism. We also show that a combination of blue- and red-shifted pulses can create and destroy an exciton within a timescale ~20 ps determined by the pulse duration and ultimately limited by the phonon thermalisation time.
Superconductivity from Orbital-Selective Electron-Phonon Coupling in $A\mathrm{V}_3\mathrm{Sb}_5$
Creators: name: Ritz, Ethan T.
name: Røising, Henrik S.
name: Christensen, Morten H.
name: Birol, Turan
name: Andersen, Brian M.
name: Fernandes, Rafael M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent experiments have shown that the phase diagrams of the kagome superconductors $A\mathrm{V}_3\mathrm{Sb}_5$ are strongly impacted by changes in the $c$-axis lattice parameter. Here, we show that $c$-axis deformations impact primarily the Sb apical bonds and thus the overlap between their $p_z$ orbitals. Changes in the latter, in turn, substantially affect low-energy electronic states with significant Sb character, most notably the central electron pocket and the van Hove singularities located above the Fermi level. Based on the orbital-selective character of $c$-axis strain, we argue that these electronic states experience a non-negligible attractive electron-phonon pairing interaction mediated by fluctuations in the apical Sb bonds. We thus propose a multi-band model for superconductivity in $A\mathrm{V}_3\mathrm{Sb}_5$ that includes both the Sb pocket and the V-derived van Hove singularities. Upon comparing the theoretical phase diagram with the experimentally observed vanishing of the $T_c$ dome across a Lifshitz transition of the Sb pocket, we propose that either an $s^{+-}$ or an $s^{++}$ state is realized in $A\mathrm{V}_3\mathrm{Sb}_5$.
description: 7+5 pages, 2+4 figures. Accepted in Phys. Rev. B
The molecular regulation of endometrial angiogenesis
Creators: name: Walter., Lisa
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.
Our stories heal -- mind, body and soul : pivoting to a healing-centered engagement in an applied theatre residency
Creators: name: Manning, Courtney Nicole
name: 0000-0003-1310-4282
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Applied theatre
Devised theatre
Healing-centered engagement
Community theatre
Autoethnography
Embodiment
Dance
Drama-based pedagogy

description: Professor, author, and youth development activist Shawn Ginwright proposes the importance of healing-centered engagement (HCE) for youth in urban communities and their facilitators. His scholarship invites readers to gain a unique perspective on how as youth development professionals engage and interact with young people to bring justice and support interactions that might be healing and restorative. Ginwright’s 2022 Book Four Pivots: Reimagining Justice, Reimagining Ourselves argues how facilitators in social justice work with youth might move toward (HCE) from four pivots: awareness, connection, vision, and presence. This MFA thesis is a qualitative case study of a teaching artist facilitation experience during aa 9-week applied theatre residency at a group home facility in central, Texas. The researcher uses reflective practitioner and autoethnographic analysis to examine coded data representing how she pivoted (in relation to all four pivots) as a facilitator throughout the entire project, Our Stories Heal.