cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Study of the projected sensitivity on the anomalous quartic gauge couplings via $Zγγ$ production at the CLIC
Creators: name: Ari, V.
name: Gurkanli, E.
name: Köksal, M.
name: Gutiérrez-Rodríguez, A.
name: Hernández-Ruíz, M. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Gauge boson self-couplings are completely defined by the non-Abelian gauge symmetry of the Standard Model (SM). For this reason, a direct search for these couplings is extremely significant in understanding the gauge structure of the SM. The possible deviation from the SM predictions of gauge boson self-couplings would be a sign of the presence of new physics beyond the SM. In this work, we study the sensitivities on the anomalous couplings defined by dimension-8 operators related to the $ZZγγ$ and $Zγγγ$ quartic vertices through the process $e^+e^- \to Zγγ$ with Z-boson decaying to charged leptons at the Compact Linear Collider (CLIC). We analyze the center-of-mass energy of 3 TeV, integrated luminosities of ${\cal L}=1, 4, 5$ $\rm ab^{-1}$, systematic uncertainties of $δ_{sys}=0\%, 3\%, 5\%$, unpolarized and polarized electron beams and considering the Initial State Radiation and Beamstrahlung effects for extraction of expected sensitivity on the anomalous $f_ {T,j}/Λ^4$ couplings at $95\%$ confidence level, which are especially sensitive to the $Zγγ$ channel. It is clear from the results that we expect better limits on the couplings if the systematic error is improved. The best limits obtained on the anomalous quartic couplings for the process $e^+e^- \to Zγγ$ with $\sqrt{s}= 3$ TeV, ${\cal L}=5$ $\rm ab^{-1}$, and $δ_{sys}=0\%$ can be approximately improved up to about 1.1 times better than the limits obtained with $δ_{sys}=5\%$. Our sensitivities on the anomalous quartic couplings can set more stringent sensitivity by two orders of magnitude concerning the best sensitivity derived from the current experimental limits. Finally, with initial electron beam polarization, the sensitivity of the anomalous quartic couplings improves by almost a factor of 1.2.
description: 34 pages, 15 figures
Toward automating knowledge acquisition for a financial expert system
Creators: name: Bay, Kathleen Kim.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Renormalization of Supersymmetric Lifshitz Sigma Models
Creators: name: Yan, Ziqi
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the renormalization of an N = 1 supersymmetric Lifshitz sigma model in three dimensions. The sigma model exhibits worldvolume anisotropy in space and time around the high-energy z = 2 Lifshitz point, such that the worldvolume is endowed with a foliation structure along a preferred time direction. In curved backgrounds, the target-space geometry is equipped with two distinct metrics, and the interacting sigma model is power-counting renormalizable. At low energies, the theory naturally flows toward the relativistic sigma model where Lorentz symmetry emerges. In the superspace formalism, we develop a heat kernel method that is covariantized with respect to the bimetric target-space geometry, using which we evaluate the one-loop beta-functions of the Lifshitz sigma model. This study forms an essential step toward a thorough understanding of the quantum critical supermembrane as a candidate high-energy completion of the relativistic supermembrane.
description: 35 pages; v2: published version, two references added
Dynamic Density Functional Theory of Multicomponent Cellular Membranes
Creators: name: Stanton, Liam G.
name: Oppelstrup, Tomas
name: Carpenter, Timothy S.
name: Ingólfsson, Helgi I.
name: Surh, Michael P.
name: Lightstone, Felice C.
name: Glosli, James N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a continuum model trained on molecular dynamics (MD) simulations for cellular membranes composed of an arbitrary number of lipid types. The model is constructed within the formalism of dynamic density functional theory and can be extended to include features such as the presence of proteins and membrane deformations. This framework represents a paradigm shift by enabling simulations that can access length scales on the order of microns and time scales on the order of seconds, all while maintaining near fidelity to the underlying MD models. These length and time scales are significant for accessing biological processes associated with signaling pathways within cells. Membrane interactions with RAS, a protein implicated in roughly 30% of human cancers, are considered as an application. Simulation results are presented and verified with MD simulations, and implications of this new capability are discussed.
Indirect probes of the trilinear Higgs coupling: $gg \to h$ and $h \to γγ$
Creators: name: Gorbahn, Martin
name: Haisch, Ulrich
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In the framework of the Standard Model effective field theory, we examine the indirect constraints on the trilinear Higgs coupling $λ$ that arise from Higgs production in gluon-gluon-fusion and diphoton Higgs decays. We calculate 2-loop contributions to the $gg \to h$ and $h \to γγ$ amplitudes that are affected by modifications of the trilinear Higgs-boson vertex. This calculation involves both the computation of anomalous dimensions and finite matching corrections. Based on our new results, we analyse the sensitivity of present and future measurements of the $hgg$ and $h γγ$ couplings to shifts in $λ$. Under the assumption that $O_6 = - λ\left (H^\dagger H \right )^3$ is the only dimension-6 operator that alters the trilinear Higgs interactions, we find that at present the considered loop-level probes provide stronger constraints than $pp \to 2h$. At future high-energy colliders indirect ${\cal O} (5)$ determinations of the trilinear Higgs coupling may be possible, making precision measurements of $gg \to h$ and $h \to γγ$ a useful addition to direct extractions of $λ$ through double-Higgs production.
description: 17 pages, 5 figures
An evaluation of Manhattan Control using simulation methods
Creators: name: Tan, Yoke Liat Eugene.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Formation of amorphous carbon multi-walled nanotubes from random initial configurations
Creators: name: Ugwumadu, C.
name: Thapa, R.
name: Al-Majali, Y.
name: Trembly, J.
name: Drabold, D. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Amorphous carbon nanotubes (a-CNT) with up to four walls and sizes ranging from 200 to 3200 atoms have been simulated, starting from initial random configurations and using the Gaussian Approximation Potential [Phys. Rev. B 95, 094203 (2017)]. The important variables (like density, height, and diameter) required to successfully simulate a-CNTs, were predicted with a machine learning random forest technique. The models were validated $\textit{ex post facto}$ using density functional codes. The a-CNT models ranged from 0.55 nm - 2 nm wide with an average inter-wall spacing of 0.31 nm. The topological defects in a-CNTs were discussed and new defect configurations were observed. The electronic density of states and localization in these phases were discussed and delocalized electrons in the $π$ subspace were identified as an important factor for inter-layer cohesion. Spatial projection of the electronic conductivity favors axial transport along connecting hexagons, while non-hexagonal parts of the network either hinder or bifurcate the electronic transport. A vibrational density of states was calculated and is potentially an experimentally testable fingerprint of the material and the appearance of a low-frequency radial breathing mode was discussed. The thermal conductivity at 300 K was calculated using the Green-Kubo formula.
Artificial Intelligence Ethics and Safety: practical tools for creating "good" models
Creators: name: Corrêa, Nicholas Kluge
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The AI Robotics Ethics Society (AIRES) is a non-profit organization founded in 2018 by Aaron Hui to promote awareness and the importance of ethical implementation and regulation of AI. AIRES is now an organization with chapters at universities such as UCLA (Los Angeles), USC (University of Southern California), Caltech (California Institute of Technology), Stanford University, Cornell University, Brown University, and the Pontifical Catholic University of Rio Grande do Sul (Brazil). AIRES at PUCRS is the first international chapter of AIRES, and as such, we are committed to promoting and enhancing the AIRES Mission. Our mission is to focus on educating the AI leaders of tomorrow in ethical principles to ensure that AI is created ethically and responsibly. As there are still few proposals for how we should implement ethical principles and normative guidelines in the practice of AI system development, the goal of this work is to try to bridge this gap between discourse and praxis. Between abstract principles and technical implementation. In this work, we seek to introduce the reader to the topic of AI Ethics and Safety. At the same time, we present several tools to help developers of intelligent systems develop "good" models. This work is a developing guide published in English and Portuguese. Contributions and suggestions are welcome.
description: I would like to withdraw this preprint because it has incorrect and outdated information
Photoionization Models for the Semi-Forbidden C III] 1909 Emission in Star-Forming Galaxies
Creators: name: Jaskot, Anne
name: Ravindranath, Swara
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The increasing neutrality of the intergalactic medium at z>6 suppresses Ly-alpha emission, and spectroscopic confirmation of galaxy redshifts requires detecting alternative UV lines. The strong [C III] 1907 + C III] 1909 doublet frequently observed in low-metallicity, actively star-forming galaxies is a promising emission feature. We present CLOUDY photoionization model predictions for C III] equivalent widths (EWs) and line ratios as a function of starburst age, metallicity, and ionization parameter. Our models include a range of C/O abundances, dust content, and gas density. We also examine the effects of varying the nebular geometry and optical depth. Only the stellar models that incorporate binary interaction effects reproduce the highest observed C III] EWs. The spectral energy distributions from the binary stellar population models also generate observable C III] over a longer timescale relative to single-star models. We show that diagnostics using C III] and nebular He II 1640 can separate star-forming regions from shock-ionized gas. We also find that density-bounded systems should exhibit weaker C III] EWs at a given ionization parameter, and C III] EWs could therefore select candidate Lyman continuum-leaking systems. In almost all models, C III] is the next strongest line at < 2700 Angstroms after Ly-alpha, and C III] reaches detectable levels for a wide range of conditions at low metallicity. C III] may therefore serve as an important diagnostic for characterizing galaxies at z>6.
description: Resubmitted to ApJ after addressing referee comments, 27 pages, 18 figures
Inexact Penalty Decomposition Methods for Optimization Problems with Geometric Constraints
Creators: name: Lapucci, Matteo
name: Kanzow, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49J53, 65K10, 90C22, 90C30, 90C33

description: This paper provides a theoretical and numerical investigation of a penalty decomposition scheme for the solution of optimization problems with geometric constraints. In particular, we consider some situations where parts of the constraints are nonconvex and complicated, like cardinality constraints, disjunctive programs, or matrix problems involving rank constraints. By a variable duplication and decomposition strategy, the method presented here explicitly handles these difficult constraints, thus generating iterates which are feasible with respect to them, while the remaining (standard and supposingly simple) constraints are tackled by sequential penalization. Inexact optimization steps are proven sufficient for the esulting algorithm to work, so that it is employable even with difficult objective functions. The current work is therefore a significant generalization of existing papers on penalty decomposition methods. On the other hand, it is related to some recent publications which use an augmented Lagrangian idea to solve optimization problems with geometric constraints. Compared to these methods, the decomposition idea is shown to be numerically superior since it allows much more freedom in the choice of the subproblem solver, and since the number of certain (possibly expensive) projection steps is significantly less. Extensive numerical results on several highly complicated classes of optimization problems in vector and matrix paces indicate that the current method is indeed very efficient to solve these problems.
description: Comput Optim Appl (2023)
Directionality and head-tail recognition in the keV-range with the MIMAC detector by deconvolution of the ionic signal
Creators: name: Beaufort, Cyprien
name: Guillaudin, Olivier
name: Muraz, Jean-François
name: Sauzet, Nadine
name: Santos, Daniel
name: Babut, Richard
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Directional detection is the only strategy for the unambiguous identification of galactic Dark Matter (DM) even in the presence of an irreducible background such as beyond the neutrino floor. This approach requires measuring the direction of a DM-induced nuclear recoil in the keV-range. To probe such low energies, directional detectors must operate at high gain where 3D track reconstruction can be distorted by the influence of the numerous ions produced in the avalanches. The article describes the interplay between electrons and ions during signal formation in a Micromegas. It introduces SimuMimac, a simulation tool dedicated to high gain detection that agrees with MIMAC measurements. This work proposes an analytical formula to deconvolve the ionic signal induced on the grid from any measurements, with no need for prior nor ad hoc parameter. This deconvolution is experimentally tested and validated, revealing the fine structure of the primary electrons cloud and consequently leading to head-tail recognition in the keV-range. Finally, the article presents how this deconvolution can be used for directionality by reconstructing the spectra of mono-energetic $27~\mathrm{keV}$ and $8~\mathrm{keV}$ neutrons with an angular resolution better than $15^\circ$. This novel approach for directionality appears as complementary to the standard one from 3D tracks reconstruction and offers redundancy for improving directional performances at high gain in the keV region.
description: 30 pages, 16 figures
Branding post-conflict cities and nations: theory and cases
Creators: name: Jovic, Maja
Publisher: name: University of Westminster
Year: 2018

description: Positive images have helped cities and nations attract investments, visitors, residents and talent. In contrast, a number of places are struggling with unfamiliarity and image problems based on inaccurate information or stereotypes. In other cases, a turbulent past, political instability, natural disasters, violence and economic downturns are to blame. Brand management is here particularly challenging but needed for many emerging, newly industrialised and transitional nations. A strong sense of national identity has the power to be a productive and enabling force in a society, providing positive social capital – improved cooperation within society, information flows, resilience and better functioning institutions. This thesis develops an understanding of how the process of branding may be used to help recreate an image of a post-conflict city or nation. It evaluates the potential, context and rationale of models designed to aid the branding process in environments defined by war residue. To do so, an interdisciplinary approach has been developed to identify the relations between the effect of national image and nationalism on brands, the built environment, and the image as a destination. The thesis draws on topics, experiences and questions from four different themes: conflict, tourism, marketing and architecture. Overall, it contributes to ongoing debates about branding and expands on them by exploring the unique post-conflict setting of Serbia, where discourses around urbanism, cosmopolitanism, the rural and local, as well as tensions between neighbouring countries are played out. The thesis examines the data relating to the case study of Serbia through a critical discourse analysis of printed media and interviews with key experts from the region. The research acknowledges literature on political or destination branding of other post-conflict countries, however, these are usually considered from a singular aspect – political science, implementation of a social programme or destination marketing. The thesis’ contributions are exploring the role of residents in a post-conflict environment and identifying it as a most important factor to consider when creating a branding strategy. It argues cities cannot carry the weight of a country’s brand, even though this is often an “ad hoc” solution, nor can national identity be interchangeable with the brand. The thesis argues First World branding models largely overlook the question of whether a place is post-conflict at all, and what form the conflict has taken. It provides a theoretical framework to analyse the construction of post-conflict national identities by drawing upon tourism, architecture, theories of national identity, and brand management.
Transition disks: the observational revolution from SEDs to imaging
Creators: name: van der Marel, Nienke
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Protoplanetary disks surrounding young stars are the birth place of planets. Of particular interest are the transition disks with large inner dust cavities of tens of au, hinting at the presence of massive companions. These cavities were first recognized by a deficit in their Spectral Energy Distribution (SED), later confirmed by millimeter interferometry observations. The Atacama Large Millimeter/submillimeter Array (ALMA) has truly revolutionized the field of spatially resolved imaging of protoplanetary disks in both dust and gas, providing important hints for the origin of gaps and cavities. At the same time, new types of substructures have been revealed. Also infrared observations show a large range of substructures both in resolved imaging, interferometry and spectroscopy. Since the last review paper of transition disks (Protostars and Planets VI), a huge amount of data has been taken, which led to numerous new insights in the origin of transition disks. In this review I will summarize the observational efforts from the past decade, compare their insights with the predictions from SED modeling, analyze the properties of the transition disk population and discuss their role in general disk evolution.
description: Accepted review chapter for EPJ+, in press. 38 pages, 16 figures, 5 tables
Truncated $γ$-exponential models for tidal stellar systems
Creators: name: Gomez-Leyton, Y. J.
name: Velazquez, L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We introduce a parametric family of models to characterize the properties of astrophysical systems in a quasi-stationary evolution under the incidence evaporation. We start from an one-particle distribution $f_γ\left(\mathbf{q},\mathbf{p}|β,\varepsilon_{s}\right)$ that considers an appropriate deformation of Maxwell-Boltzmann form with inverse temperature $β$, in particular, a power-law truncation at the scape energy $\varepsilon_{s}$ with exponent $γ>0$. This deformation is implemented using a generalized $γ$-exponential function obtained from the \emph{fractional integration} of ordinary exponential. As shown in this work, this proposal generalizes models of tidal stellar systems that predict particles distributions with \emph{isothermal cores and polytropic haloes}, e.g.: Michie-King models. We perform the analysis of thermodynamic features of these models and their associated distribution profiles. A nontrivial consequence of this study is that profiles with isothermal cores and polytropic haloes are only obtained for low energies whenever deformation parameter $γ
Computational experiments with medium to large scale parametric quadratic programming problems
Creators: name: Manor, Idan.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Designing refrigerators in higher dimensions using quantum spin models
Creators: name: Konar, Tanoy Kanti
name: Ghosh, Srijon
name: Pal, Amit Kumar
name: De, Aditi Sen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We design quantum refrigerators based on spin-j quantum XYZ and bilinear-biquadratic models with individual spins attached to bosonic thermal baths. By considering both local and global master equations, we illustrate an enhancement in the performance of the refrigerators with an increase in the spin dimension irrespective of the choice of the spin models. To assess the performance of the refrigerators, we introduce a distance-based measure to quantify the local temperature of a particle with arbitrary spin quantum number j. Interestingly, we find that the local temperature quantifier, defined via minimizing the distance between a spin-j thermal state and the evolved state of the spin-j particle in the steady state, coincides with the population-based definition of local temperature known in the literature for spin-1/2 particles. Moreover, we demonstrate that the qualitative behavior of the distance-based local temperature is independent of the choice of the distance measure by comparing the trace distance, Uhlmann's fidelity and relative entropy distance. We further observe by computing local master equation that the quantum refrigerator consisting of a spin-1/2 and a spin-j particle can lead to a lower local temperature compared to a refrigerator with two identical spin-j particles following the XYZ interactions.
description: v1: 12 pages, 9 figures, v2: 14 pages, 10 figures, close to published version
Non-BPS Bubbling Geometries in AdS$_3$
Creators: name: Bah, Ibrahima
name: Heidmann, Pierre
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We construct large classes of non-BPS smooth horizonless geometries that are asymptotic to AdS$_3\times$S$^3\times$T$^4$ in type IIB supergravity. These geometries are supported by electromagnetic flux corresponding to D1-D5 charges. We show that Einstein equations for systems with eight commuting Killing vectors decompose into a set of Ernst equations, thereby admitting an integrable structure. This feature, which can a priori be applied to other AdS$_D\times\mathcal{C}$ settings in supergravity, allows us to use solution-generating techniques associated with the Ernst formalism. We explicitly derive solutions by applying the charged Weyl formalism that we have previously developed. These are sourced internally by a chain of bolts that correspond to regions where the orbits of the commuting Killing vectors collapse smoothly. We show that these geometries can be interpreted as non-BPS T$^4$ and S$^3$ deformations on global AdS$_3\times$S$^3\times$T$^4$ that are located at the center of AdS$_3$. These non-BPS deformations can be made arbitrarily small and should therefore correspond to non-supersymmetric operators in the D1-D5 CFT. Finally, we also construct interesting bound states of non-extremal BTZ black holes connected by regular bolts.
description: 52 pages + Appendix, 16 figures; v2: minor changes and published version
The innermost astronomical unit of protoplanetary disks
Creators: name: Kluska, J.
name: Lopez, R. Garcia
name: Benisty, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Circumstellar disks around young stars are the birthsites of planets. It is thus fundamental to study the disks in which they form, their structure and the physical conditions therein. The first astronomical unit is of great interest because this is where the terrestrial-planets form and the angular momentum is controled via massloss through winds/jets. With its milli-arcsecond resolution, optical interferometry is the only technic able to spatially resolve the first few astronomical units of the disk. In this review, we will present a broad overview of studies of young stellar objects with interferometry, and discuss prospects for the future.
description: SPIE Astronomical Telescopes + Instrumentation 2016 in Edinburgh, Scotland, 8 pages, 2 figures
Ceramics Collections: exploring object engagement beyond the known historic models of clay practice
Creators: name: Twomey, Clare
Publisher: name: University of Westminster
Year: 2018

description: This practice-­‐based research examines ceramics collections and artistic practice. It explicitly focuses on the exploration of object engagement beyond the historic models of clay practice and the uses of clay as a medium through which to examine cultural and museological challenges. It is centred on five artworks by the author made between 2006 and 2015 (Trophy, 2006, Forever, 2010, Exchange, 2012, Piece by Piece, 2013, Manifest: 10,000 hours, 2015). These employ advances in curatorial practice and theory that have informed the curation of ceramic artefacts held by museums seeking to reframe the relationship between material culture and clay culture, and the modes and devices of how ceramics are displayed. These five exhibition works have interrogated traditional understandings of ceramic collections in museums and their boundaries. These exhibitions, together with this commentary, constitute this PhD by publication. Ceramics, clay practice and craft are the context of these developmental works that have expanded thinking within the field. The thesis discusses the long-­‐term development of ceramic and craft practices of immersive works that can be used as a tool to access our understanding of ceramic collections and trajectories. The research recognizes shifts in the contextual development of craft practice and in the literature developing alongside practice during a period from the 1960s onwards. In the contextual review the museum and the collections in focus are addressed in the contexts of audience engagement, participation and live works, and issues are raised in relation to time-­‐based works and shared authorships. The critical developments of clay practice are also addressed within the timeframe of each section. Each of the five artworks is outlined in terms of context, research and development. These works have addressed the main question of how ceramic collections may be animated and explored through the audience’s participation. Through ten years of research, experimentation and close investigation, these questions have been slowly and carefully developed to test the boundaries of knowledge regarding arts and museum practices, encouraging a continued relationship with these concerns.
Mouse T cell repertoires as statistical ensembles: overall characterization and age dependence
Creators: name: Sethna, Zachary
name: Elhanati, Yuval
name: Dudgeon, Crissy S.
name: Callan, Curtis G.
name: Levine, Arnold
name: Mora, Thierry
name: Walczak, Aleksandra M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Genomics (q-bio.GN)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: The ability of the adaptive immune system to respond to arbitrary pathogens stems from the broad diversity of immune cell surface receptors (TCRs). This diversity originates in a stochastic DNA editing process (VDJ recombination) that acts each time a new immune cell is created from a stem cell. By analyzing T cell sequence repertoires taken from the blood and thymus of mice of different ages, we quantify the significant changes in this process that occur in development from embryo to young adult. We find a rapid increase with age in the number of random insertions in the VDJ recombination process, leading to a dramatic increase in diversity. Since the blood accumulates thymic output over time, blood repertoires are mixtures of different statistical recombination processes and, by unraveling the mixture statistics, we can obtain a clear picture of the time evolution of the early immune system. Sequence repertoire analysis also allows us to detect the effect of selection on the output of the VDJ recombination process. The effects we find are nearly identical between thymus and blood, suggesting that they mainly reflect selection for proper folding of the TCR receptor protein.
Access control in an XML environment
Creators: name: Keong, Sio Fai.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Dynamical analysis in regularized $4D$ Einstein-Gauss-Bonnet gravity with non-minimal coupling
Creators: name: Bayarsaikhan, Bilguun
name: Khimphun, Sunly
name: Rithy, Phearun
name: Tumurtushaa, Gansukh
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the regularized four-dimensional Einstein-Gauss-Bonnet ($4D$ EGB) gravity with a non-minimal scalar coupling function, which is an extension of the regularized $4D$ EGB theory. By introducing non-minimal coupling to the Gauss-Bonnet term, we demonstrate the additional contribution to the dynamical equations which is otherwise absent in the dimensionally-regularized theory. Furthermore, we analyze the stability of the system by using the dynamical system approach based on fixed points. Then, we consider the time evolution to investigate the history of the universe and constraint with observational data to obtain the cosmological parameters of the model.
description: 16 pages, 3 figures
Gamma-ray upper limits on magnetars with 6 years of Fermi-LAT observations
Creators: name: Li, Jian
name: Rea, Nanda
name: Torres, Diego F.
name: de Ona-Wilhelmi, Emma
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the search for gamma-ray emission from 20 magnetars using 6 years of Fermi, Large Area Telescope (LAT) observations. No significant evidence for gamma-ray emission from any of the currently-known magnetars is found. We derived the most stringent upper limits to date on the 0.1--10 GeV emission of Galactic magnetars, which are estimated between $\sim10^{-12}-10^{-11}$ erg s$^{-1}$ cm$^{-2}$. Gamma-ray pulsations were searched for the four magnetars having reliable ephemerides over the observing period, but none were detected. On the other hand, we also studied the gamma-ray morphology and spectra of seven Supernova Remnants associated or adjacent to the magnetars.
description: 22 pages, 4 figures, 2 tables, submitted to ApJ
Knowledge Graph Augmented Network Towards Multiview Representation Learning for Aspect-based Sentiment Analysis
Creators: name: Zhong, Qihuang
name: Ding, Liang
name: Liu, Juhua
name: Du, Bo
name: Jin, Hua
name: Tao, Dacheng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Aspect-based sentiment analysis (ABSA) is a fine-grained task of sentiment analysis. To better comprehend long complicated sentences and obtain accurate aspect-specific information, linguistic and commonsense knowledge are generally required in this task. However, most current methods employ complicated and inefficient approaches to incorporate external knowledge, e.g., directly searching the graph nodes. Additionally, the complementarity between external knowledge and linguistic information has not been thoroughly studied. To this end, we propose a knowledge graph augmented network KGAN, which aims to effectively incorporate external knowledge with explicitly syntactic and contextual information. In particular, KGAN captures the sentiment feature representations from multiple different perspectives, i.e., context-, syntax- and knowledge-based. First, KGAN learns the contextual and syntactic representations in parallel to fully extract the semantic features. Then, KGAN integrates the knowledge graphs into the embedding space, based on which the aspect-specific knowledge representations are further obtained via an attention mechanism. Last, we propose a hierarchical fusion module to complement these multi-view representations in a local-to-global manner. Extensive experiments on five popular ABSA benchmarks demonstrate the effectiveness and robustness of our KGAN. Notably, with the help of the pretrained model of RoBERTa, KGAN achieves a new record of state-of-the-art performance among all datasets.
description: Accepted by IEEE TKDE 2023
On the Evolution of High-Redshift Active Galactic Nuclei
Creators: name: Mao, Jirong
name: Kim, Minsun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We build a simple physical model to study the high-redshift active galactic Nucleus (AGN) evolution within the co-evolution framework of central black holes (BHs) and their host galaxies. The correlation between the circular velocity of a dark halo $V_c$ and the velocity dispersion of a galaxy $σ$ is used to link the dark matter halo mass and BH mass. The dark matter halo mass function is converted to the BH mass function for any given redshift. The high-redshift optical AGN luminosity functions (LFs) are constructed. At $z\sim 4$, the flattening feature is not shown at the faint end of the optical AGN LF. This is consistent with observational results. If the optical AGN LF at $z\sim 6$ can be reproduced in the case in which central BHs have the Eddington-limited accretion, it is possible for the AGN lifetime to have a small value of $2\times 10^5$ yrs. The X-ray AGN LFs and X-ray AGN number counts are also calculated at $2.03$, respectively, using the same parameters adopted in the calculation for the optical AGN LF at $z\sim 4$. It is estimated that about 30 AGNs per $\rm{deg}^2$ at $z>6$ can be detected with a flux limit of $3\times 10^{-17}~\rm{erg~cm^{-2}~s^{-1}}$ in the $0.5-2$ keV band. Additionally, the cosmic reionization is also investigated. The ultraviolet photons emitted from the high-redshift AGNs mainly contribute to the cosmic reionization, and the central BHs of the high-redshift AGNs have a mass range of $10^6-10^8M_\odot$. We also discuss some uncertainties in both the AGN LFs and AGN number counts originating from the $M_{\rm{BH}}-σ$ relation, Eddington ratio, AGN lifetime, and X-ray attenuation in our model.
description: 2016, ApJ, 828, 96
Measurement of the ratio of the sixth order to the second order cumulant of net-proton multiplicity distributions in relativistic heavy-ion collisions
Creators: name: Chen, Lizhu
name: Li, Zhiming
name: Cui, Fenping
name: Wu, Yuanfang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the measurement of the sixth order cumulant and its ratio to the second order cumulant ($C_6/C_2$) in relativistic heavy-ion collisions. The influence of statistics and different methods of centrality bin width correction on $C_6/C_2$ of net-proton multiplicity distributions is demonstrated. There is no satisfactory method to extract $C_6/C_2$ with the current statistics recorded at lower energies by STAR at RHIC. With statistics comparable to the expected statistics at the planned future RHIC Beam Energy Scan II (BES II), no energy dependence of $C_6/C_2$ is observed in central collisions using the UrQMD model. We find if the transition signal is as strong as predicted by the PQM model, then it is hopefully observed at the upcoming RHIC BES II.
Overview of Advanced LIGO Adaptive Optics
Creators: name: Brooks, Aidan F.
name: Abbott, Benjamin
name: Arain, Muzammil A.
name: Ciani, Giacomo
name: Cole, Ayodele
name: Grabeel, Greg
name: Gustafson, Eric
name: Guido, Chris
name: Heintze, Matthew
name: Heptonstall, Alastair
name: Jacobson, Mindy
name: Kim, Won
name: King, Eleanor
name: Lynch, Alexander
name: O'Connor, Stephen
name: Ottaway, David
name: Mailand, Ken
name: Mueller, Guido
name: Munch, Jesper
name: Sannibale, Virginio
name: Shao, Zhenhua
name: Smith, Michael
name: Veitch, Peter
name: Vo, Thomas
name: Vorvick, Cheryl
name: Willems, Phil
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: This is an overview of the adaptive optics used in Advanced LIGO (aLIGO), known as the thermal compensation system (TCS). The thermal compensation system was designed to minimize thermally-induced spatial distortions in the interferometer optical modes and to provide some correction for static curvature errors in the core optics of aLIGO. The TCS is comprised of ring heater actuators, spatially tunable CO$_{2}$ laser projectors and Hartmann wavefront sensors. The system meets the requirements of correcting for nominal distortion in Advanced LIGO to a maximum residual error of 5.4nm, weighted across the laser beam, for up to 125W of laser input power into the interferometer.
Measuring Noise Parameters Using an Open, Short, Load, and 1/8-wavelength Cable as Source Impedances
Creators: name: Price, Danny C.
name: Tong, Cheuk-Yu Edward
name: Sutinjo, Adrian T.
name: Greenhill, Lincoln J.
name: Patra, Nipanjana
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Noise parameters are a set of four measurable quantities which determine the noise performance of a radio-frequency device under test. The noise parameters of a 2-port device can be extracted by connecting a set of 4 or more source impedances at the device's input, measuring the noise power of the device with each source connected, and then solving a matrix equation. However, sources with high reflection coefficients cannot be used due to a singularity that arises in entries of the matrix. Here, we detail a new method of noise parameter extraction using a singularity-free matrix that is compatible with high-reflection sources. We show that open, short, load and an open cable ("OSLC") can be used to extract noise parameters, and we detail a practical measurement approach. The OSLC approach is particularly well-suited for low-noise amplifier measurement at frequencies below 1 GHz, where alternative methods require physically large apparatus.
description: IEEE Transactions on Microwave Theory and Techniques
Primordial Gravitational Waves and Rescattered Electromagnetic Radiation in the Cosmic Microwave Background
Creators: name: Kim, Dong-Hoon
name: Trippe, Sascha
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Understanding the interaction of primordial gravitational waves (GWs) with the Cosmic Microwave Background (CMB) plasma is important for observational cosmology. In this article, we provide an analysis of an effect apparently overlooked as yet. We consider a single free electric charge and suppose that it can be agitated by primordial GWs propagating through the CMB plasma, resulting in periodic, regular motion along particular directions. Light reflected by the charge will be partially polarized, and this will imprint a characteristic pattern on the CMB. We study this effect by considering a simple model in which anisotropic incident electromagnetic (EM) radiation is rescattered by a charge sitting in spacetime perturbed by GWs and becomes polarized. As the charge is driven to move along particular directions, we calculate its dipole moment to determine the leading-order rescattered EM radiation. The Stokes parameters of the rescattered radiation exhibit a net linear polarization. We investigate how this polarization effect can be schematically represented out of the Stokes parameters. We work out the representations of gradient modes (E-modes) and curl modes (B-modes) to produce polarization maps. Although the polarization effect results from GWs, we find that its representations, the E- and B-modes, do not practically reflect the GW properties such as strain amplitude, frequency and polarization states.
description: 25 pages, 7 figures; to appear in ApJ (received: 2016 April 25; accepted: 2016 July 2)
Pulse Shaping for MC via Particle Size
Creators: name: Wicke, Wayan
name: Felsheim, Rebecca C.
name: Brand, Lukas
name: Jamali, Vahid
name: Loos, Helene M.
name: Buettner, Andrea
name: Schober, Robert
Publisher: name: arXiv
Year: 2022
Subjects: subject: Emerging Technologies (cs.ET)
subject: FOS: Computer and information sciences

description: In molecular communication (MC), combining different types of particles at the transmitter is a degree of freedom which can be utilized to improve performance. In this paper, we address the problem of pulse shaping to simplify time synchronization requirements by exploiting and combining the received signal characteristics of particles of different sizes. In particular, we optimize the mixture of particles of different sizes used for transmission in order to support a prescribed detection time period for on-off keying, guaranteeing on average 1) a sufficiently large received signal if a binary one is transmitted, and 2) a low enough received signal if a binary zero is transmitted even in the presence of inter-symbol interference. For illustration, we consider an optimization problem based on a free space diffusion channel model. It is shown that there is a tradeoff between the maximum feasible detection duration and the peak detection value for different particle sizes from the smallest particle size enabling the largest detection duration to the largest particle size minimizing the peak detection value at the expense of a limited detection duration.
description: \c{opyright} 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
Controllable atomic collision in a tight optical dipole trap
Creators: name: Wang, Zhu-Bo
name: Gu, Chen-yue
name: Hu, Xin-Xin
name: Zhang, Ya-Ting
name: Zhang, Ji-Zhe
name: Li, Gang
name: He, Xiao-Dong
name: Zou, Xu-Bo
name: Dong, Chun-Hua
name: Guo, Guang-Can
name: Zou, Chang-Ling
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Single atoms are interesting candidates for studying quantum optics and quantum information processing. Recently, trapping and manipulation of single atoms using tight optical dipole traps have generated considerable interest. Here we report an experimental investigation of the dynamics of atoms in a modified optical dipole trap with a backward propagating dipole trap beam, where a change in the two-atom collision rate by six times has been achieved. The theoretical model presented gives a prediction of high probabilities of few-atom loading rates under proper experimental conditions. This work provides an alternative approach to the control of the few-atom dynamics in a dipole trap and the study of the collective quantum optical effects of a few atoms.
description: 5 pages, 3 figures