cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Numerical tests of magnetoreception models assisted with behavioral experiments on American cockroaches
Creators: name: Lee, Kai Sheng
name: Dumke, Rainer
name: Paterek, Tomasz
Publisher: name: arXiv
Year: 2020
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Many animals display sensitivity to external magnetic field, but only in the simplest organisms the sensing mechanism is understood. Here we report on behavioural experiments where American cockroaches (Periplaneta americana) were subjected to rotating external magnetic fields with a period of 10 minutes. The insects show increased activity when placed in a rotating Earth-strength field, whereas this effect is diminished in ten times stronger rotating field. We analyse established models of magnetoreception, the magnetite model and the radical pair model, in light of this adaptation result. Our findings show that the magnetite model is excluded and the radical pair model requires strong additional assumptions to be compatible with the data.
Coherent Helicity-Dependent Spin-Phonon Oscillations in the Ferromagnetic van der Waals Crystal CrI3
Creators: name: Padmanabhan, P.
name: Buessen, F. L.
name: Tutchton, R.
name: Kwock, K. W. C.
name: Gilinsky, S.
name: Lee, M. C.
name: McGuire, M. A.
name: Singamaneni, S. R.
name: Yarotski, D. A.
name: Paramekanti, A.
name: Zhu, J. -X.
name: Prasankumar, R. P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The discovery of two-dimensional (2D) systems hosting intrinsic long-range magnetic order represents a seminal addition to the rich physical landscape of van der Waals (vdW) materials. CrI3 has emerged as perhaps the most salient example, as the interdependence of crystalline structure and magnetic order, along with strong light-matter interactions provides a promising platform to explore the optical control of magnetic, vibrational, and charge degrees of freedom at the 2D limit. However, the fundamental question of how this relationship between structure and magnetism manifests on their intrinsic timescales has rarely been explored. Here, we use ultrafast optical spectroscopy to probe magnetic and vibrational dynamics in CrI3, revealing demagnetization dynamics governed by spin-flip scattering and remarkably, a strong transient exchange-mediated interaction between lattice vibrations and spin oscillations. The latter yields a coherent spin-coupled phonon mode that is highly sensitive to the helicity of the driving pulse in the magnetically ordered phase. Our results shed light on the nature of spin-lattice coupling in vdW magnets on ultrafast timescales and highlight their potential for applications requiring non-thermal, high-speed control of magnetism at the nanoscale.
description: 7 pages, 3 figures
Subcellular trafficking of Dengue virus non-structural protein 5
Creators: name: Rawlinson., Stephen M.
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.
On the best choice of Lasso program given data parameters
Creators: name: Berk, Aaron
name: Plan, Yaniv
name: Yilmaz, Özgür
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: E.4; H.1.1; G.1.6
subject: 90C47, 90C25, 94B75, 46N10, 47L07,

description: Generalized compressed sensing (GCS) is a paradigm in which a structured high-dimensional signal may be recovered from random, under-determined, and corrupted linear measurements. Generalized Lasso (GL) programs are effective for solving GCS problems due to their proven ability to leverage underlying signal structure. Three popular GL programs are equivalent in a sense and sometimes used interchangeably. Tuned by a governing parameter, each admit an optimal parameter choice. For sparse or low-rank signal structures, this choice yields minimax order-optimal error. While GCS is well-studied, existing theory for GL programs typically concerns this optimally tuned setting. However, the optimal parameter value for a GL program depends on properties of the data, and is typically unknown in practical settings. Performance in empirical problems thus hinges on a program's parameter sensitivity: it is desirable that small variation about the optimal parameter choice begets small variation about the optimal risk. We examine the risk for these three programs and demonstrate that their parameter sensitivity can differ for the same data. We prove a gauge-constrained GL program admits asymptotic cusp-like behaviour of its risk in the limiting low-noise regime. We prove that a residual-constrained Lasso program has asymptotically suboptimal risk for very sparse vectors. These results contrast observations about an unconstrained Lasso program, which is relatively less sensitive to its parameter choice. We support the asymptotic theory with numerical simulations, demonstrating that parameter sensitivity of GL programs is readily observed for even modest dimensional parameters. Importantly, these simulations demonstrate regimes in which a GL program exhibits sensitivity to its parameter choice, though the other two do not. We hope this work aids practitioners in selecting a GL program for their problem.
Improving Text Relationship Modeling with Artificial Data
Creators: name: Organisciak, Peter
name: Ryan, Maggie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Digital Libraries (cs.DL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Data augmentation uses artificially-created examples to support supervised machine learning, adding robustness to the resulting models and helping to account for limited availability of labelled data. We apply and evaluate a synthetic data approach to relationship classification in digital libraries, generating artificial books with relationships that are common in digital libraries but not easier inferred from existing metadata. We find that for classification on whole-part relationships between books, synthetic data improves a deep neural network classifier by 91%. Further, we consider the ability of synthetic data to learn a useful new text relationship class from fully artificial training data.
description: 9 pages, 3 figures
The gas distribution in the high-redshift cluster MS 1054-0321
Creators: name: Mirakhor, M. S.
name: Birkinshaw, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the gas mass distribution in the high redshift cluster MS 1054-0321 using Chandra X-ray and OCRA SZ effect data. We use a superposition of offset $β$-type models to describe the composite structure of MS 1054-0321. We find gas mass fractions $f_{gas}^\rm{X\mbox{-}ray} = 0.087_{-0.001}^{+0.005}$ and $f_{gas}^\rm{SZ} = 0.094_{-0.001}^{+0.003}$ for the (main) eastern component of MS 1054-0321 using X-ray or SZ data, but $f_{gas}^\rm{X\mbox{-}ray} = 0.030 _{-0.014}^{+0.010}$ for the western component. The gas mass fraction for the eastern component is in agreement with some results reported in the literature, but inconsistent with the cosmic baryon fraction. The low gas mass fraction for the western component is likely to be a consequence of gas stripping during the ongoing merger. The gas mass fraction of the integrated system is $0.060_{-0.009}^{+0.004}$: we suggest that the missing baryons from the western component are present as hot diffuse gas which is poorly represented in existing X-ray images. The missing gas could appear in sensitive SZ maps.
description: 12 pages, 4 figures, and 5 tables
Programmable Unitary Operations for Orbital Angular Momentum Encoded States
Creators: name: Li, Shikang
name: Feng, Xue
name: Cui, Kaiyu
name: Liu, Fang
name: Zhang, Wei
name: Huang, Yidong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We have proposed and demonstrated a scalable and efficient scheme for programmable unitary operations in orbital angular momentum (OAM) domain. Based on matrix decomposition into diagonal and Fourier factors, arbitrary matrix operators can be implemented only by diagonal matrices alternately acting on orbital angular momentum domain and azimuthal angle domain, which are linked by Fourier transform. With numerical simulations, unitary matrices with dimensionality of 3*3 are designed and discussed for OAM domain. Meanwhile, the parallelism of our proposed scheme is also presented with two 3*3 matrices. Furthermore, as an alternative to verify our proposal, proof of principle experiments have been performed on path domain with the same matrix decomposition method, in which an average fidelity of 0.97 is evaluated through 80 experimental results with dimensionality of 3*3.
description: The manuscript includes abstract (about 150 words), text part (about 4700 words), 7 figures and 42 references
Observation of spatio-temporal pattern in magnetised rf plasmas
Creators: name: Bandyopadhyay, P.
name: Sharma, D.
name: Konopka, U.
name: Morfill, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We address an experimental observation of pattern formation in a magnetised rf plasma. The experiments are carried out in a electrically grounded aluminium chamber which is housed inside a rotatable superconducting magnetic coil. The plasma is formed by applying a rf voltage in parallel plate electrodes in push-pull mode under the background of argon gas. The time evolution of plasma intensity shows that a homogeneous plasma breaks into several concentric radial spatiotemoral bright and dark rings. These rings propagate radially at considerably low pressure and a constant magnetic field. These patterns are observed to trap small dust particles/grains in their potential. Exploiting this property of the patterns, a novel technique to measure the electric field associated with the patterns is described. The resulting estimates of the corresponding field intensity are presented. At other specific discharge parameters the plasma shows a range of special type of characteristic structures observed in certain other chemical, mechanical and biological systems.
description: It contains four pages with four figures
A study of neural pathways in the ovine hypothalamus that control food intake and energy expenditure
Creators: name: Qi., Yue
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.
Effects of chiral helimagnets on vortex states in a superconductor
Creators: name: Fukui, Saoto
name: Kato, Masaru
name: Togawa, Yoshihiko
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have investigated vortex states in chiral helimagnet/superconductor bilayer systems under an applied external magnetic field Happl, using the Ginzburg-Landau equations. Effect of the chiral helimagnet on the superconductor is taken as a magnetic field HCHM, which is perpendicular to the superconductor and oscillates spatially. For Happl = 0 and weak HCHM, there appear pairs of up-and down-vortices. Increasing Happl, down-vortices gradually disappear, and number of up-vortices increases in the large magnetic field region. Then, up-vortices form parallel, triangular, or square structures.
description: 7 pages, 13 figures
TMDs and SSAs in hadronic interactions
Creators: name: Aschenauer, E. C.
name: D'Alesio, U.
name: Murgia, F.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present an overview on the current experimental and phenomenological status of transverse single spin asymmetries (tSSAs) in proton-proton collisions. In particular, we focus on large-$p_T$ inclusive pion, photon, jet, pion-jet production and Drell-Yan processes. For all of them theoretical estimates are given in terms of a generalised parton model (GPM) based on a transverse momentum dependent (TMD) factorisation scheme. Comparisons with the corresponding results in a collinear twist-3 formalism and in a modified GPM approach are also made. On the experimental side, a selection of the most interesting and recent results from RHIC is presented.
description: 19 pages, 20 figures with 28 ps files, uses svjour.cls. Invited review contribution to the Special Issue on "3D Structure of the Nucleon" to be published in the European Physical Journal A - Hadrons and Nuclei
Another proof of BEC in the GP-limit
Creators: name: Hainzl, Christian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We present a fresh look at the methods introduced by Boccato, Brennecke, Cenatiempo, and Schlein concerning the trapped Bose gas and give a conceptually very simple and concise proof of BEC in the Gross-Pitaevskii limit for small interaction potentials.
description: final version
Rajinikanth, self-reflexivity and the Tamil star as paratext
Creators: name: Saverimuttu, Meenaatchi
Publisher: name: Macquarie University
Year: 2024
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: Contemporary Tamil mass hero films are largely dependent on viewers having prior knowledge of film canon, celebrities, industry happenings and socio-political issues in the South Indian state of Tamil Nadu. This thesis argues that the inherent self-reflexivity of contemporary Tamil masala films ‘entangles’ stars with film texts to such an extent that they can be considered as paratexts; a text which frames the consumption of the film, by providing context and additional information to audiences. Taking ‘Super Star’ Rajinikanth as the primary example, this thesis surveys various films from Rajinikanth’s career, unpacking the many ways in which genre and nostalgia shape the star.Rajinikanth’s unique charisma and trademark ‘style’ endear him to his fans, and even close to half a century after his debut, he continues to be one of the most popular stars within Indian cinema. Mass heroes such as Rajinikanth are built up across several decades, with incremental changes to their onscreen personas in the form of call backs and recurring gags, repeated tropes and specific aesthetics and exaggerated performative acts. Therefore, this thesis conceptualises the Tamil star as a cumulative paratext, which is constituted from the identities of both the on- and off-screen star across many films and over many years. Alongside a close textual analysis of eight of Rajinikanth’s films from 1992 to 2020, this thesis also includes ethnographic observations of audiences in Australian theatres during the screenings of Petta (2019) and Darbar (2020). Drawing on these observations, this thesis notes the particular ways in which mass hero films are structured to 'invite' audiences to engage with their prior knowledge of the star as paratext; further enriching the cinematic experience.
Existence and regularity results for some Fully Non Linear singular or degenerate equation
Creators: name: Ndaw, Cheikhou Oumar
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: G.1.8
subject: 35D40, 35J15, 35J60, 35J70, 35J75

description: In this article we prove existence, uniqueness and regularity for the singular equation \begin{eqnarray*} \begin{cases} |\nabla u|^α(F(D^{2}u)+h(x)\cdot\nabla u)+c(x)|u|^αu+p(x)u^{-γ}=0 \ \mbox{ in } \ Ω\\ u>0 \ \mbox{ in } \ Ω, \ u=0 \ \mbox{ on } \ \partialΩ\end{cases} \end{eqnarray*} when $p$ is some continuous and positive function, $c$ and $h$ are continuous, $α> -1$ and $F$ is Fully non linear elliptic. Some conditions on the first eigenvalue for the operator $|\nabla u|^α(F(D^{2}u)+h(x)\cdot\nabla u)+c(x)|u|^αu$ are required. The results generalizes the well known results of Lazer and Mac Kenna.
The role of peptide and protein structure during gradient elution reversed phase high-performance liquid chromatography
Creators: name: Purcell., Anthony W.
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.
On the geometry of geometric rank
Creators: name: Geng, Runshi
name: Landsberg, J. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Complexity (cs.CC)
subject: Algebraic Geometry (math.AG)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 15A69, 68Q17, 14L30

description: We make a geometric study of the Geometric Rank of tensors recently introduced by Kopparty et al. Results include classification of tensors with degenerate geometric rank in $C^3\otimes C^3\otimes C^3$, classification of tensors with geometric rank two, and showing that upper bounds on geometric rank imply lower bounds on tensor rank.
A statistical physics viewpoint on the dynamics of the bouncing ball
Creators: name: Chastaing, Jean-Yonnel
name: Géminard, Jean-Christophe
name: Bertin, Eric
Publisher: name: arXiv
Year: 2015
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study from a statistical physics perspective the dynamics of a bouncing ball maintained in a chaotic regime thanks to collisions with a plate experiencing an aperiodic vibration. We analyze in details the energy exchanges between the bead and the vibrating plate, and show that the coupling between the bead and the plate can be modeled in terms of both a dissipative process and an injection mechanism by an energy reservoir, where the dynamics of the reservoir obeys only a 'blurred' version of detailed balance. An analysis of the injection statistics in terms of fluctuation relation is also provided.
description: 15 pages, 13 figures, submitted to J. Stat. Mech
J-matrix method of scattering for inverse-square singular potential with supercritical coupling I. Theory
Creators: name: Alhaidari, Abdulaziz D.
name: Bahlouli, Hocine
name: Aparicio, Carlos P.
name: Al-Marzoug, Saeed M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: The J-matrix method of scattering was developed to handle regular short-range potentials with applications in atomic, nuclear and molecular physics. Its accuracy, stability, and convergence properties compare favorably with other successful scattering methods. It is an algebraic method, which is built on the utilization of orthogonal polynomials that satisfy three-term recursion relations and on the manipulation of tridiagonal matrices. Recently, we extended the method to the treatment of 1/r^2 singular short-range potentials but confined ourselves to the sub-critical coupling regime where the coupling parameter strength of the 1/r^2 singularity is greater than -1/8. In this work, we expand our study to include the supercritical coupling in which the coupling parameter strength is less than -1/8. However, to accomplish that we had to extend the formulation of the method to objects that satisfy five-term recursion relations and matrices that are penta-diagonal. It is remarkable that we could develop the theory without regularization or self-adjoint extension, which are normally needed in the treatment of such highly singular potentials. Nonetheless, we had to pay the price by extending the formulation of the method into this larger representation and by coping with slower than usual convergence. In a follow-up study, we intend to apply the method to obtain scattering information for realistic potential models.
description: Dedicated to the memory of our departed friend, colleague and collaborator, Prof. Mohammed S. Abdelmonem; 23 pages, 3 appendices, and 2 colored figures; Eq. (13b) corrected
A new similarity law for transonic-supersonic flow
Creators: name: Liu, Luoqin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: How to determine accurately and efficiently the aerodynamic forces of the aircraft in high-speed flow is one of great challenges in modern aerodynamics. In this Letter we propose a new similarity law for steady transonic-supersonic flow over thin bodies. The new similarity law is based on the local Mach number frozen principle. It depends on both the specific heat ratio and the free-stream Mach number. The new similarity law enables one to determine the lift and drag coefficients of the aircraft from that of a reference state which is more reachable. The validity of the new similarity law has been confirmed by the excellent agreement with numerical simulations of both two-dimensional airfoil flows and three-dimensional wing flows.
Quantification of Uncertainties in Turbulence Modeling: A Comparison of Physics-Based and Random Matrix Theoretic Approaches
Creators: name: Wang, Jian-Xun
name: Sun, Rui
name: Xiao, Heng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Numerical models based on Reynolds-Averaged Navier-Stokes (RANS) equations are widely used in engineering turbulence modeling. However, the RANS predictions have large model-form uncertainties for many complex flows. Quantification of these large uncertainties originating from the modeled Reynolds stresses has attracted attention in turbulence modeling community. Recently, a physics-based Bayesian framework for quantifying model-form uncertainties has been proposed with successful applications to several flows. Nonetheless, how to specify proper priors without introducing unwarranted, artificial information remains challenging to the current form of the physics-based approach. Another recently proposed method based on random matrix theory provides the prior distributions with the maximum entropy, which is an alternative for model-form uncertainty quantification in RANS simulations. In this work, we utilize the random matrix theoretic approach to assess and possibly improve the specification of priors used in the physics-based approach. The numerical results show that, to achieve maximum entropy in the prior of Reynolds stresses, the perturbations of shape parameters in Barycentric coordinates are normally distributed. Moreover, the perturbations of the turbulence kinetic energy should conform to log-normal distributions. Finally, it sheds light on how large the variance of each physical variable should be compared with each other to achieve the approximate maximum entropy prior. The conclusion can be used as a guidance for specifying proper priors in the physics-based, Bayesian uncertainty quantification framework.
description: 38 pages, 10 figures
SABRE: WIMP modulation detection in the northern and southern hemisphere
Creators: name: Froborg, Francis
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Measuring an annual modulation in a direct Dark Matter detection experiment is not only a proof of the existence of WIMPs but can also tell us more about their interaction with standard matter and maybe even their density and velocity in the halo. Such a modulation has been measured by the DAMA/LIBRA experiment in NaI(Tl) crystals. However, the interpretation as WIMP signal is controversial due to contradicting results by other experiments. The SABRE experiment aims to shed light on this controversy by detecting the annual modulation in the same target material as DAMA with twin detectors at LNGS in Italy and at SUPL in Australia. The two locations in the northern and southern hemisphere allow to verify if other seasonal effects or the site have an influence on the measurement, thus reducing systematic effects. This paper will give an overview on the experimental design, the current status of the proof of principle phase mainly devoted to high-purity crystal growing, and an outlook on future plans.
description: Proceedings of the XIV International Conference on Topics in Astroparticle and Underground Physics (TAUP 2015), 7-11 September 2015, Torino, Italy
Detection of Gravitational Waves using Parametric Resonance in Bose-Einstein Condensates
Creators: name: Robbins, Matthew P. G.
name: Afshordi, Niayesh
name: Jamison, Alan O.
name: Mann, Robert B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An interesting proposal for detecting gravitational waves involves quantum metrology of Bose-Einstein condensates (BECs). We consider a forced modulation of the BEC trap, whose frequency matches that of an incoming continuous gravitational wave. The trap modulation induces parametric resonance in the BEC, which in turn enhances sensitivity of the BEC to gravitational waves. We find that such a BEC detector could potentially be used to detect gravitational waves across several orders of magnitude in frequency, with the sensitivity depending on the speed of sound, size of the condensate, and frequency of the phonons. We outline a possible BEC experiment and discuss the current technological limitations. We also comment on the potential noise sources as well as what is necessary for such a detector to become feasible.
description: 20 pages, 9 figures; updated figures; clarified some discussions
The effect of alcohol consumption on body composition and health status in community and hospital populations
Creators: name: Prijatmoko., Dwi
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.
High frequency limit of spectroscopy
Creators: name: Nazarov, Vladimir U.
name: Baer, Roi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider an arbitrary quantum mechanical system, initially in its ground-state, exposed to a time-dependent electromagnetic pulse with a carrier frequency $ω_0$ and a slowly varying envelope of finite duration. By working out a solution to the time-dependent Schrödinger equation in the high-$ω_0$ limit, we find that, to the leading order in $ω_0^{-1}$, a perfect self-cancellation of the system's linear response occurs as the pulse switches off. Surprisingly, the system's observables are, nonetheless, describable in terms of a combination of its linear density response function and nonlinear functions of the electric field. An analysis of jellium slab and jellium sphere models reveals a very high surface sensitivity of the considered setup, producing a richer excitation spectrum than accessible within the conventional linear response regime. On this basis, we propose a new spectroscopic technique, which we provisionally name the Nonlinear High-Frequency Pulsed Spectroscopy (NLHFPS). Combining the advantages of the extraordinary surface sensitivity, the absence of constraints by the traditional dipole selection rules, and the clarity of theoretical interpretation utilizing the linear response time-dependent density functional theory, NLHFPS has a potential to evolve into a powerful characterization method for nanoscience and nanotechnology.
description: 17 pages, 10 figures
Inadequacy of Linear Methods for Minimal Sensor Placement and Feature Selection in Nonlinear Systems; a New Approach Using Secants
Creators: name: Otto, Samuel E.
name: Rowley, Clarence W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Sensor placement and feature selection are critical steps in engineering, modeling, and data science that share a common mathematical theme: the selected measurements should enable solution of an inverse problem. Most real-world systems of interest are nonlinear, yet the majority of available techniques for feature selection and sensor placement rely on assumptions of linearity or simple statistical models. We show that when these assumptions are violated, standard techniques can lead to costly over-sensing without guaranteeing that the desired information can be recovered from the measurements. In order to remedy these problems, we introduce a novel data-driven approach for sensor placement and feature selection for a general type of nonlinear inverse problem based on the information contained in secant vectors between data points. Using the secant-based approach, we develop three efficient greedy algorithms that each provide different types of robust, near-minimal reconstruction guarantees. We demonstrate them on two problems where linear techniques consistently fail: sensor placement to reconstruct a fluid flow formed by a complicated shock-mixing layer interaction and selecting fundamental manifold learning coordinates on a torus.
The closest to $0$ spectral number of the partial theta function
Creators: name: Kostov, Vladimir
Publisher: name: arXiv
Year: 2016
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: The {\em spectrum} of the partial theta function $θ:=\sum _{j=0}^{\infty}q^{j(j+1)/2}x^j$ is the set of values of $q\in \mathbb{C}$, $0
Isolation and characterisation of human luteinizing hormone isoforms
Creators: name: Pozvek., Gordana C.
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.
Ultra-low-power second-order nonlinear optics on a chip
Creators: name: McKenna, Timothy P.
name: Stokowski, Hubert S.
name: Ansari, Vahid
name: Mishra, Jatadhari
name: Jankowski, Marc
name: Sarabalis, Christopher J.
name: Herrmann, Jason F.
name: Langrock, Carsten
name: Fejer, Martin M.
name: Safavi-Naeini, Amir H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Second-order nonlinear optical processes are used to convert light from one wavelength to another and to generate quantum entanglement. Creating chip-scale devices to more efficiently realize and control these interactions greatly increases the reach of photonics. Optical crystals and guided wave devices made from lithium niobate and potassium titanyl phosphate are typically used to realize second-order processes but face significant drawbacks in scalability, power, and tailorability when compared to emerging integrated photonic systems. Silicon or silicon nitride integrated photonic circuits enhance and control the third-order optical nonlinearity by confining light in dispersion-engineered waveguides and resonators. An analogous platform for second-order nonlinear optics remains an outstanding challenge in photonics. It would enable stronger interactions at lower power and reduce the number of competing nonlinear processes that emerge. Here we demonstrate efficient frequency doubling and parametric oscillation in a thin-film lithium niobate photonic circuit. Our device combines recent progress on periodically poled thin-film lithium niobate waveguidesand low-loss microresonators. Here we realize efficient >10% second-harmonic generation and parametric oscillation with microwatts of optical power using a periodically-poled thin-film lithium niobate microresonator. The operating regimes of this system are controlled using the relative detuning of the intracavity resonances. During nondegenerate oscillation, the emission wavelength is tuned over terahertz by varying the pump frequency by 100's of megahertz. We observe highly-enhanced effective third-order nonlinearities caused by cascaded second-order processes resulting in parametric oscillation. These resonant second-order nonlinear circuits will form a crucial part of the emerging nonlinear and quantum photonics platforms.
description: 14 pages, 8 figures. Equal contribution by the first two authors
Lower bound of assortativity coefficient in scale-free networks
Creators: name: Yang, Dan
name: Pan, Liming
name: Zhou, Tao
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: The degree-degree correlation is important in understanding the structural organization of a network and the dynamics upon a network. Such correlation is usually measured by the assortativity coefficient $r$, with natural bounds $r \in [-1,1]$. For scale-free networks with power-law degree distribution $p(k) \sim k^{-γ}$, we analytically obtain the lower bound of assortativity coefficient in the limit of large network size, which is not -1 but dependent on the power-law exponent $γ$. This work challenges the validation of assortativity coefficient in heterogeneous networks, suggesting that one cannot judge whether a network is positively or negatively correlated just by looking at its assortativity coefficient.
description: 9 pages, 5 figures and 1 Table
A Forward Backward Greedy approach for Sparse Multiscale Learning
Creators: name: Shekhar, Prashant
name: Patra, Abani
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Multiscale Models are known to be successful in uncovering and analyzing the structures in data at different resolutions. In the current work we propose a feature driven Reproducing Kernel Hilbert space (RKHS), for which the associated kernel has a weighted multiscale structure. For generating approximations in this space, we provide a practical forward-backward algorithm that is shown to greedily construct a set of basis functions having a multiscale structure, while also creating sparse representations from the given data set, making representations and predictions very efficient. We provide a detailed analysis of the algorithm including recommendations for selecting algorithmic hyper-parameters and estimating probabilistic rates of convergence at individual scales. Then we extend this analysis to multiscale setting, studying the effects of finite scale truncation and quality of solution in the inherent RKHS. In the last section, we analyze the performance of the approach on a variety of simulation and real data sets, thereby justifying the efficiency claims in terms of model quality and data reduction.
Antichymotrypsin misfolding and its role in disease
Creators: name: Powers., Glenn
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.
Optimal binning of X-ray spectra and response matrix design
Creators: name: Kaastra, J. S.
name: Bleeker, J. A. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: 85-08

description: A theoretical framework is developed to estimate the optimal binning of X-ray spectra. We derived expressions for the optimal bin size for model spectra as well as for observed data using different levels of sophistication. It is shown that by taking into account both the number of photons in a given spectral model bin and their average energy over the bin size, the number of model energy bins and the size of the response matrix can be reduced by a factor of $10-100$. The response matrix should then contain the response at the bin centre as well as its derivative with respect to the incoming photon energy. We provide practical guidelines for how to construct optimal energy grids as well as how to structure the response matrix. A few examples are presented to illustrate the present methods.
description: 16 pages, 7 figures, accepted for publication in Astronomy and Astrophysics
A New Neuromorphic Computing Approach for Epileptic Seizure Prediction
Creators: name: Tian, Fengshi
name: Yang, Jie
name: Zhao, Shiqi
name: Sawan, Mohamad
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: Human-Computer Interaction (cs.HC)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Several high specificity and sensitivity seizure prediction methods with convolutional neural networks (CNNs) are reported. However, CNNs are computationally expensive and power hungry. These inconveniences make CNN-based methods hard to be implemented on wearable devices. Motivated by the energy-efficient spiking neural networks (SNNs), a neuromorphic computing approach for seizure prediction is proposed in this work. This approach uses a designed gaussian random discrete encoder to generate spike sequences from the EEG samples and make predictions in a spiking convolutional neural network (Spiking-CNN) which combines the advantages of CNNs and SNNs. The experimental results show that the sensitivity, specificity and AUC can remain 95.1%, 99.2% and 0.912 respectively while the computation complexity is reduced by 98.58% compared to CNN, indicating that the proposed Spiking-CNN is hardware friendly and of high precision.
description: Accepted to 2021 IEEE International Symposium on Circuits and Systems (ISCAS)
Investigation of passive flow control over an airfoil using leading edge tubercles
Creators: name: Mishra, Alok
name: De, Ashoke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The present paper numerically investigates flow control over NACA0021 (National Advisory Committee for Aeronautics) airfoil by applying a leading-edge tubercle as a passive flow control device at transitional Reynolds number (Re) regime. The study includes simulations over the unmodified airfoil and modified airfoil operating at Re=120000 using kT-kL-ω based Delayed Detached Eddy Simulation (DDES) model. The calculations include both the pre-stall and post-stall regions, while the performance of the mean flow aerodynamic properties like pressure, lift, skin-friction, and drag coefficients are also investigated in the presence of tubercles. The spanwise flow over the modified airfoil interacts with the primary flow. The turbulent separation gets delayed compared to the unmodified airfoil, thereby significantly improving the stall behavior and flow behavior in the post-stall region. The modified airfoil provides the gradual stall behavior against the steep stall behavior for the unmodified airfoil. To optimize tubercle configuration, the study considers two modified airfoils with different combinations of amplitude and wavelength. The unsteady analysis, including the reduced-order modeling, i.e. 3D Proper orthogonal decomposition (POD), characterizes the dominant vortical structure of the flow to evaluate the improvement in the aerodynamic performance of the modified airfoil. The model decomposition for flow over airfoil helps to provide a deeper understanding of the flow control phenomenon.
A radiatively induced inverse seesaw model with hidden $U(1)$ gauge symmetry
Creators: name: Nomura, Takaaki
name: Okada, Hiroshi
name: Sanyal, Prasenjit
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose an inverse seesaw scenario under hidden $U(1)$ gauge symmetry, having rather natural hierarchies among neutral fermion mass scales. The hierarchies are derived from theory and experimental constraints. The theory requires Majorana exotic masses have to be induced at one-loop level. The experimental side requests that the Dirac mass terms has to be highly suppressed to satisfy the constraints from the lepton flavor violations(LFVs) such as $μ\to eγ$. In order to induce such a small Majorana exotic masses we introduce exotic fermions and bosons that also provide us additional intriguing phenomenologies such as muon anomalous magnetic moment, dark matter candidate as well as LFVs and deviations in leptonic $Z$ decays. We analyze these phenomenologies including neutrino oscillation data numerically, and show allowed region. Finally, we discuss the DM candidate in both the cases of fermion and scalar boson, where we focus on rather lighter range that is equal or less than 10 GeV. The dominant contributions originate from interactions of hidden gauge sector, and we show allowed ranges for both cases.
description: 30 pages, 5 figures
Expectation on Observation of Supernova Remnants with the LHAASO Project
Creators: name: Liu, Ye
name: Cao, Zhen
name: Chen, Songzhan
name: Chen, Yang
name: Cui, Shuwang
name: He, Huihai
name: Huang, Xingtao
name: Ma, Xinhua
name: Yuan, Qiang
name: Zhang, Xiao
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Supernova remnants (SNRs) are believed to be the most important acceleration sites for cosmic rays (CRs) below $\sim10^{15}$ eV in the Galaxy. High energy photons, either directly from the shocks of the SNRs or indirectly from the interaction between SNRs and the nearby clouds, are crucial probes for the CR acceleration. Big progresses on observations of SNRs have been achieved by space- and ground-based $γ$-ray facilities. However, whether $γ$-rays come from accelerated hadrons or not, as well as their connection with the CRs observed at Earth, remains in debate. Large High Altitude Air Shower Observatory (LHAASO), the next generation experiment, is designed to survey the northern part of the very high energy $γ$-ray sky from $\sim 0.3$ TeV to PeV with the sensitivity of $\lesssim1\%$ of the Crab nebula flux. In this paper, we indicate that LHAASO will be dedicated to enlarging the $γ$-ray SNR samples and improving the spectral and morphological measurements. These measurements, especially at energies above 30 TeV, will be important for us to finally understand the CR acceleration in SNRs.
description: 8 pages, 7 figures, accepted to publish in the Astrophysical Journal
"Social Laser": Action Amplification by Stimulated Emission of Social Energy
Creators: name: Khrennikov, Andrei
Publisher: name: arXiv
Year: 2015
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Neurons and Cognition (q-bio.NC)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The problem of the "explanation" of recent social explosions, especially in the Middle East, but also in Southern Europe and the USA, have been debated actively in the social and political literature. We can mention the contributions of P. Mason, F. Fukuyama, E. Schmidt and J. Cohen, I. Krastev to this debate. We point out that the diversity of opinions and conclusions is really amazing. At the moment, there is no consistent and commonly acceptable theory of these phenomena. We present a model of social explosions based on a novel approach for the description of social processes, namely, the quantum-like approach. Here quantum theory is treated simply as an operational formalism - without any direct relation to physics. We explore the quantum-like laser model to describe the possibility of Action Amplification by Stimulated Emission of Social Energy (ASE).
The Wide-Angle Outflow of the Lensed z = 1.51 AGN HS 0810+2554
Creators: name: Chartas, G.
name: Cappi, M.
name: Hamann, F.
name: Eracleous, M.
name: Strickland, S.
name: Giustini, M.
name: Misawa, T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present results from X-ray observations of the gravitationally lensed z = 1.51 AGN HS 0810+2554 performed with the Chandra X-ray Observatory and XMM-Newton. Blueshifted absorption lines are detected in both observations at rest-frame energies ranging between ~1-12 keV at > 99% confidence. The inferred velocities of the outflowing components range between ~0.1c and ~0.4c. A strong emission line at ~6.8 keV accompanied by a significant absorption line at ~7.8 keV is also detected in the Chandra observation. The presence of these lines is a characteristic feature of a P-Cygni profile supporting the presence of an expanding outflowing highly ionized iron absorber in this quasar. Modeling of the P-Cygni profile constrains the covering factor of the wind to be > 0.6, assuming disk shielding. A disk-reflection component is detected in the XMM-Newton observation accompanied by blueshifted absorption lines. The XMM-Newton observation constrains the inclination angle to be < 45 degrees at 90% confidence, assuming the hard excess is due to blurred reflection from the accretion disk. The detection of an ultrafast and wide-angle wind in an AGN with intrinsic narrow absorption lines (NALs) would suggest that quasar winds may couple efficiently with the intergalactic medium and provide significant feedback if ubiquitous in all NAL and BAL quasars. We estimate the mass-outflow rate of the absorbers to lie in the range of 1.5 and 3.4 Msolar/yr for the two observations. We find the fraction of kinetic to electromagnetic luminosity released by HS 0810+2554 is large (epsilon = 9 (-6,+8)) suggesting that magnetic driving is likely a significant contributor to the acceleration of this outflow.
description: 27 pages, 13 figures, Accepted for publication in ApJ