cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Space-Time Duality between Quantum Chaos and Non-Hermitian Boundary Effect
Creators: name: Zhou, Tian-Gang
name: Zhou, Yi-Neng
name: Zhang, Pengfei
name: Zhai, Hui
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum chaos in hermitian systems concerns the sensitivity of long-time dynamical evolution to initial conditions. The skin effect discovered recently in non-hermitian systems reveals the sensitivity to the spatial boundary condition even deeply in bulk. In this letter, we show that these two seemingly different phenomena can be unified through space-time duality. The intuition is that the space-time duality maps unitary dynamics to non-unitary dynamics and exchanges the temporal direction and spatial direction. Therefore, the space-time duality can establish the connection between the sensitivity to the initial condition in the temporal direction and the sensitivity to the boundary condition in the spatial direction. Here we demonstrate this connection by studying the space-time duality of the out-of-time-ordered commutator in a concrete chaotic hermitian model. We show that the out-of-time-ordered commutator is mapped to a special two-point correlator in a non-hermitian system in the dual picture. For comparison, we show that this sensitivity disappears when the non-hermiticity is removed in the dual picture.
description: 5 pages, 3 figures; supplmentary material 8 pages, 2 figures
Thermometry in dual quantum dot set-up with staircase ground state configuration
Creators: name: Banerjee, Sagnik
name: Singha, Aniket
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose and investigate thermometry of a setup employing dual quantum dots with staircase ground state configuration. The stair-case ground state configuration actuates thermally controlled inelastic tunnelling, which translates into a temperature sensitive conductance, thereby inducing thermometry. The performance of the set-up is then analyzed employing quantum master equation (QME) for such systems in the sequential tunnelling regime. In particular, it is demonstrated that the system performance, in terms of temperature sensitivity and efficiency, is maximum in the regime of low temperature, making such system suitable for cryogenic thermometry. The proposed set-up can pave the path towards realization of high performance cryogenic nano temperature sensors.
description: 8 pages, 6 figures
Model order reduction methods for geometrically nonlinear structures: a review of nonlinear techniques
Creators: name: Touzé, Cyril
name: Vizzaccaro, Alessandra
name: Thomas, Olivier
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: This paper aims at reviewing nonlinear methods for model order reduction of structures with geometric nonlinearity, with a special emphasis on the techniques based on invariant manifold theory. Nonlinear methods differ from linear based techniques by their use of a nonlinear mapping instead of adding new vectors to enlarge the projection basis. Invariant manifolds have been first introduced in vibration theory within the context of nonlinear normal modes (NNMs) and have been initially computed from the modal basis, using either a graph representation or a normal form approach to compute mappings and reduced dynamics. These developments are first recalled following a historical perspective, where the main applications were first oriented toward structural models that can be expressed thanks to partial differential equations (PDE). They are then replaced in the more general context of the parametrisation of invariant manifold that allows unifying the approaches. Then the specific case of structures discretized with the finite element method is addressed. Implicit condensation, giving rise to a projection onto a stress manifold, and modal derivatives, used in the framework of the quadratic manifold, are first reviewed. Finally, recent developments allowing direct computation of reduced-order models (ROMs) relying on invariant manifolds theory are detailed. Applicative examples are shown and the extension of the methods to deal with further complications are reviewed. Finally, open problems and future directions are highlighted.
description: 64 pages, 8 figures
Video Aesthetic Quality Assessment Using Kernel Support Vector Machine With Isotropic Gaussian Sample Uncertainty (Ksvm-Igsu)
Creators: name: Tzelepis, Christos
name: Mavridaki, Eftichia
name: Mezaris, Vasileios
name: Patras, Ioannis
Publisher: name: Zenodo
Year: 2016
Subjects: Video aesthetic quality assessment
Rules of photography and cinematography
Support vector machine
Video representation uncertainty

description: In this paper we propose a video aesthetic quality assessment method that combines the representation of each video according to a set of photographic and cinematographic rules, with the use of a learning method that takes the video representation's uncertainty into consideration. Specifically, our method exploits the information derived from both low- and high-level analysis of video layout, leading to a photo- and motion-based video representation scheme. Subsequently, a kernel Support Vector Machine (SVM) extension, the KSVM-iGSU, is trained to classify the videos and retrieve those of high aesthetic value. Experimental results on our large dataset verify the effectiveness of the proposed method. We also make publicly available our dataset, in order to facilitate research in the area of video aesthetic quality assessment.
Identification of 3 cataclysmic variables detected by the ART-XC and eROSITA telescopes aboard SRG during the all-sky X-ray survey
Creators: name: Zaznobin, I.
name: Sazonov, S.
name: Burenin, R.
name: Uskov, G.
name: Semena, A.
name: Gilfanov, M.
name: Medvedev, P.
name: Sunyaev, R.
name: Eselevich, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the discovery of three previously unknown cataclysmic variables in the data of the first year of the all-sky X-ray survey by the SRG orbital observatory. The sources were selected due to their brightness in the 4--12 keV band in the data of the Mikhail Pavlinsky ART-XC telescope. They are also detected by the eROSITA telescope, which provided accurate localizations and spectral data for broad-band spectral analysis. All three objects had been previously known as X-ray sources from the ROSAT all-sky survey and XMM-Newton slew survey, but their nature remained unknown. The X-ray spectra obtained by eROSITA and ART-XC are consistent with optically thin thermal emission with a temperature kT>~15 keV for SRGAJ194638.9+704552 and SRGAJ225412.8+690658 and kT>~5 keV for SRGAJ204547.8+672642. This, together with the inferred high X-ray luminosities ($2\times 10^{32}$-$3\times 10^{33}$ erg s$^{-1}$), strongly suggests that all three sources are CVs. We have obtained optical photometry and spectroscopy for these objects using the AZT-33IK 1.6-m telescope of the Sayan Observatory. The optical properties confirm the CV nature of the objects. We conclude that SRGAJ194638.9+704552 is an intermediate polar, SRGAJ204547.8+672642 is most likely a polar or an intermediate polar, and SRGAJ225412.8+690658 can be either a magnetic or a non-magnetic CV. We also measured an orbital period of 2.98~hours for SRGAJ204547.8+672642, based on TESS data. Three out of the planned eight SRG all-sky surveys have now been completed. We expect to find plenty of new CVs during the survey and to continue our optical follow-up program.
description: Accepted for publication in A&A Special Issue: The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the SRG Mission. 9 pages, 5 figures
Cornering the Two Higgs Doublet Model Type II
Creators: name: Atkinson, Oliver
name: Black, Matthew
name: Lenz, Alexander
name: Rusov, Aleksey
name: Wynne, James
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We perform a comprehensive study of the allowed parameter space of the Two Higgs Doublet Model of Type II (2HDM-II). Using the theoretical framework flavio we combine the most recent flavour, collider and electroweak precision observables with theoretical constraints to obtain bounds on the mass spectrum of the theory. In particular we find that the 2HDM-II fits the data slightly better than the Standard Model (SM) with best fit values of the heavy Higgs masses around 2 TeV and a value of $\tan β\approx 4$. Moreover, we conclude that the wrong-sign limit is disfavoured by Higgs signal strengths and excluded by the global fit by more than five standard deviations and potential deviations from the alignment limit can only be tiny. Finally we test the consequences of our study on electroweak baryogenesis via the program package BSMPT and we find that the allowed parameter space strongly discourages a strong first order phase transition within the 2HDM-II.
description: 52 pages, 20 figures, 8 tables, revised version, published in JHEP
Zeroth and First Order Stochastic Frank-Wolfe Algorithms for Constrained Optimization
Creators: name: Akhtar, Zeeshan
name: Rajawat, Ketan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper considers stochastic convex optimization problems with two sets of constraints: (a) deterministic constraints on the domain of the optimization variable, which are difficult to project onto; and (b) deterministic or stochastic constraints that admit efficient projection. Problems of this form arise frequently in the context of semidefinite programming as well as when various NP-hard problems are solved approximately via semidefinite relaxation. Since projection onto the first set of constraints is difficult, it becomes necessary to explore projection-free algorithms, such as the stochastic Frank-Wolfe (FW) algorithm. On the other hand, the second set of constraints cannot be handled in the same way, and must be incorporated as an indicator function within the objective function, thereby complicating the application of FW methods. Similar problems have been studied before; however, they suffer from slow convergence rates. This work, equipped with momentum based gradient tracking technique, guarantees fast convergence rates on par with the best-known rates for problems without the second set of constraints. Zeroth-order variants of the proposed algorithms are also developed and again improve upon the state-of-the-art rate results. We further propose the novel trimmed FW variants that enjoy the same convergence rates as their classical counterparts, but are empirically shown to require significantly fewer calls to the linear minimization oracle speeding up the overall algorithm. The efficacy of the proposed algorithms is tested on relevant applications of sparse matrix estimation, clustering via semidefinite relaxation, and uniform sparsest cut problem.
Dynamic Equations of Motion for Inextensible Beams and Plates
Creators: name: Deliyianni, Maria
name: McHugh, Kevin
name: Webster, Justin T.
name: Dowell, Earl
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 74B20, 74K20, 35L77, 93A30

description: The large deflections of cantilevered beams and plates are modeled and discussed. Traditional nonlinear elastic models (e.g., that of von Karman) employ elastic restoring forces based on the effect of stretching on bending, and these are less applicable to cantilevers. Recent experimental work indicates that elastic cantilevers are subject to nonlinear inertial and stiffness effects. We review a recently established (quasilinear and nonlocal) cantilevered beam model, and consider some natural extensions to two dimensions -- namely, inextensible plates. Our principal configuration is that of a thin, isotropic, homogeneous rectangular plate, clamped on one edge and free on the remaining three. We proceed through the geometric and elastic modeling to obtain equations of motion via Hamilton's principle for the appropriately specified energies. We enforce {\em effective} inextensibility constraints through Lagrange multipliers. Multiple plate analogs of the established 1D model are obtained, based on various assumptions. For each plate model, we present the modeling hypotheses and the resulting equations of motion. It total, we present three distinct nonlinear partial differential equation models, and, additionally, describe a class of ``higher order" models. Each model has particular advantages and drawbacks for both mathematical and engineering analyses. We conclude with an in depth discussion and comparison of the various systems and some analytical problems.
Supplementary document for Vortex-antivortex pair control in quadrupole Gaussian beams - 6465229.pdf
Creators: name: Popiolek-Masajada, Agnieszka
name: Ferrando, Albert
name: Masajada, Jan
name: Khoroshun, Anna
name: Markevich, Raman
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Uncategorized

description: calculation of quadrupole polynomial
Factors enabling and hindering an eLearning programme for nurses and midwives in Afghanistan
Creators: name: A Naseem
name: KQ Ali
name: Juma, Audrey D'Souza
name: A Sajwani
name: BA Khan
name: S Sayani
name: SSR Abidi
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: Afghanistan faces an acute shortage of trained healthcare providers. To build capacity of nurses and midwives, in 2014 a private hospital in Afghanistan initiated an eLearning programme to enhance their knowledge and skills. The study was conducted to identify facilitating and hindering factors for the successful implementation of eLearning. Data collection took place between June and September 2016, when seven Maternal and Child Health (MNCH) related eLearning sessions were conducted. The participants were nurses and midwives working in MNCH wards at the research sites in Bamyan, Faizabad and Kandahar, along with the programme planners and facilitators. Data was collected through pre/post and delayed post-tests, observations and questionnaires, semi-structured interviews and documents analysis. The results highlight four major factors as important for the successful implementation of eLearning, namely: curriculum, context, technology and individual. The needs assessment ensured relevance of the sessions to the needs of the participants. However, pedagogy was lecture-based with limited focus on skills development. Poor connectivity and language of instruction posed challenges. eLearning has shown the potential for developing knowledge and skills of nurses and midwives. Clear communication between teams involved in planning and implementation of the programme, technology infrastructure, design of online pedagogy and facilitator readiness are critical for the success of eLearning in low and middle income countries.
Controlled engineering of a vortex-bright soliton dynamics using a constant driving force
Creators: name: Wang, Wenlong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: A vortex-bright soliton can precess around a fix point. Here, we find numerically that the fixed point and the associated precessional orbits can be shifted by applying a constant driving force on the bright component, the displacement is proportional to the force with a minus sign. This robust dynamics is then discussed theoretically by treating the vortex-bright soliton as an effective point particle, explaining the observed dynamics and predicting new ones that are subsequently confirmed. By appropriately tuning the force, the vortex-bright soliton can be guided following an arbitrary trajectory, including that it can be pinned and released at will. This finding opens a highly flexible and controllable approach of engineering the dynamics of vortical structures in Bose-Einstein condensates.
description: 9 pages, 4 figures
Spectral and scattering theory for topological crystals perturbed by infinitely many new edges
Creators: name: Richard, S.
name: Tsuzu, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In this paper we investigate the spectral and scattering theory for operators acting on topological crystals and on their perturbations. A special attention is paid to perturbations obtained by the addition of an infinite number of edges, and / or by the removal of a finite number of them, but perturbations of the underlying measures and perturbations by the addition of a multiplication operator are also considered. The description of the nature of the spectrum of the resulting operators, and the existence and completeness of the wave operators are standard outcomes for these investigations.
description: 24 pages
A bi-fidelity stochastic collocation method for transport equations with diffusive scaling and multi-dimensional random inputs
Creators: name: Liu, Liu
name: Pareschi, Lorenzo
name: Zhu, Xueyu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In this paper, we consider the development of efficient numerical methods for linear transport equations with random parameters and under the diffusive scaling. We extend to the present case the bi-fidelity stochastic collocation method introduced in [33,50,51]. For the high-fidelity transport model, the asymptotic-preserving scheme [29] is used for each stochastic sample. We employ the simple two-velocity Goldstein-Taylor equation as low-fidelity model to accelerate the convergence of the uncertainty quantification process. The choice is motivated by the fact that both models, high fidelity and low fidelity, share the same diffusion limit. Speed-up is achieved by proper selection of the collocation points and relative approximation of the high-fidelity solution. Extensive numerical experiments are conducted to show the efficiency and accuracy of the proposed method, even in non diffusive regimes, with empirical error bound estimations as studied in [16].
Investigating CO$_{2}$ streamer inception in repetitive pulsed discharges
Creators: name: Mirpour, Shahriar
name: Nijdam, Sander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In this study, we investigate the responsible species and processes involved in repetitive pulsed streamer inception in CO$_{2}$. We applied a 10 kV high-voltage pulse with a repetition frequency of 10 Hz and pulse width of 1 ms to a pin electrode which is placed 160 mm apart from the grounded plane electrode. We measured the inception times (delay between the rising edge of the high-voltage pulse) by a photo-multiplier tube for 600 high voltage cycles. We observed one peak in the histogram of inception times with a median of 1.2$μ$s. To identify the source of this peak, we applied a negative or positive LV pulse before the main HV pulse to manipulate the leftover space charges. Three different phenomena are observed: 1) drift, 2) neutralization, and 3) ionization in the LV pulse. At low LV amplitude and pulse width, the peak starts to drift toward the faster and slower inception times under a positive and negative LV pulse, respectively. However, under the same LV pulse configuration for positive and negative LV pulse, the observed shift in inception times is not the same. We present a hypothesis to explain this asymmetry based on the difference of the detachment processes between air and CO$_{2}$.
Excitation spectra of heavy baryons in diquark models
Creators: name: Kumakawa, Kento
name: Jido, Daisuke
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The excitation energy spectra of heavy baryons consisting of a heavy quark and two light quarks are investigated by using diquark models in order to examine the nature of the diquark as a constituent of single heavy baryons. We consider two diquark models; in model A the diquark is treated as a point-like particle, while it has a spatial size in model B. We determine the masses of scalar and axial vector diquarks by the mass difference of the ground state charmed baryons to the $Λ_{c}$ baryon, while the mass of the $ud$ scalar diquark in the $Λ_{c}$ baryon is assumed to be 500 MeV as a reference. The parameters of these models are fixed by the $1p$ excitation energy of $Λ_{c}$. We find that model A reproduces well the excitation energy spectra of the charmed and bottomed baryons, although the string tension of the confinement potential in model A should be a half of that of the charmonium, while Model B suggests degeneracy of the $2s$ and $1d$ states, which is not seen in the $Λ_{c}$ spectrum.
description: 22 pages, 13 figures, 7 tables
Radiation study of Lead Fluoride crystals
Creators: name: Cemmi, A.
name: Colangeli, A.
name: D'orsi, B.
name: Di Sarcina, I.
name: Diociaiuti, E.
name: Fiore, S.
name: Paesani, D.
name: Pillon, M.
name: Saputi, A.
name: Sarra, I.
name: Tagnani, D.
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: Lead fluoride (PbF$_2$) crystals represent an excellent and relatively innovative choice for high resolution electromagnetic calorimeters with high granularity and fast timing for high intensity environments. For this reason two PbF$_2$ crystals, sized $5\times 5 \times 40 $ mm$^3$, were irradiated with $^{60}$Co photons up to $\sim 4$ Mrad and with 14 MeV neutrons up to a $10^{13}$ n/cm$^2$ total fluence. Their loss in transmittance was evaluated at different steps of the photon and neutron irradiation campaign, resulting in a total of 30% loss above 350 nm. With crystals always kept in dark conditions, natural and thermal annealing, as well as optical bleaching with 400 nm light, were performed on the irradiated specimens, resulting in a partial recovery of their original optical characteristics.
Asymptotically exact photonic analogues of chiral symmetric topological tight-binding models
Creators: name: Palmer, Samuel J
name: Ignatov, Yordan
name: Craster, Richard V
name: Makwana, Mehul P
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Topological photonic edge states, protected by chiral symmetry, are attractive for guiding wave energy as they can allow for more robust guiding and greater control of light than alternatives; however, for photonics, chiral symmetry is often broken by long-range interactions. We look to overcome this difficulty by exploiting the topology of networks, consisting of voids and narrow connecting channels, formed by the spaces between closely spaced perfect conductors. In the limit of low frequencies and narrow channels, these void-channel systems have a direct mapping to analogous discrete mass-spring systems in an asymptotically rigorous manner and therefore only have short-range interactions. We demonstrate that the photonic analogues of topological tight-binding models that are protected by chiral symmetries, such as the SSH model and square-root semimetals, are reproduced for these void-channel networks with appropriate boundary conditions. We anticipate, moving forward, that this paper provides a basis from which to explore continuum photonic topological systems, in an asymptotically exact manner, through the lens of a simplified tight-binding model.
description: 24 pages, 10 figures, 4 supplemental figures
A Deeper Solution to the Actual Geometry of CCD Mosaic Chips
Creators: name: Zheng, Z. J.
name: Peng, Q. Y.
name: Vienne, A.
name: Lin, F. R.
name: Guo, B. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a solution to determine the actual or physical relative positions between CCD chips. Due to the limited depth of the Gaia catalogue, there may be few stars identified from the Gaia catalogue for astrometric calibration on the deep observation of a large, ground-based or space-based telescope, such as the planned two-metre Chinese Space Station Telescope (CSST). For this reason, we referred to the idea from the Hubble Space Telescope (HST) astrometry to only use stars' pixel positions to derive the relative positions between chips. We refer to the practice as differential astrometry in this paper. In order to ensure the results are reliable, we took advantage of Gaia EDR3 to derive the relative positions between chips, to provide a close comparison. We refer to the practice as photographic astrometry. We implemented the technique for the CCD mosaic chips of the Bok 2.3-m telescope based on two epochs of observations (Jan 17,2016 and Mar 5,2017). There is a good agreement between the two types of astrometry for the relative positions between chips. For the two epochs of observations, the averages of the gaps derived from photographic astrometry and differential astrometry differ to about 0.046 pixels (~0.021 arcsec) and 0.001 pixels (~0.001 arcsec), respectively, while the average precisions of the gaps are about 0.018 pixel (~0.008 arcsec) and 0.028 pixels (<0.013 arcsec), respectively. The results provide us with more confidence in applying this solution for the CCD mosaic chips of the CSST by means of differential astrometry. Compared with the solution described by Anderson & King, which has been used to determine the interchip offset of Wide Field Planetary Camera 2 (WFPC2) chips and Wide Field Camera 3 (WFC3) chips at the HST, the solution proposed in this paper shows at least a factor of two improvement in precision, on average.
Three-dimensional instantaneous orbit map for rotor-bearing system based on a novel multivariate complex variational mode decomposition algorithm
Creators: name: Cui, Xiaolong
name: Huang, Jie
name: Li, Chaoshun
name: Zhao, Yujie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Full spectrum and holospectrum are homogenous information fusion technology developed for the fault diagnosis of rotating machinery, which is extensively exploited in the analysis of the orbits of rotor-bearing systems. However, they are not adapted for non-stationary signals, nor can they be used for fusion analysis of vibrations of multiple bearing sections. By drawing inspiration from the multivariate variational mode decomposition (MVMD) and the complex-valued signal decomposition, we propose a method called multivariate complex variational mode decomposition (MCVMD). It can simultaneously extract the forward and backward components of multiple bearing sections and realize non-stationary complex signal decomposition of multiple bearing sections of the rotor. To achieve the visualization goal of condition monitoring, we propose the three-dimensional instantaneous orbit map (3D-IOM). It enables more features of shaft vibration of a rotor system to be displayed and offers a new way for the fusion analysis of vibration signals of multiple bearing sections of rotating machinery. Furthermore, making the most of the joint information, we also provide a high-resolution time-full spectrum (Time-FS) to display the forward and backward frequency components of multiple bearing sections. The effectiveness of the proposed method through both the simulated experiment and the real-life complex-valued signals is demonstrated in this paper.
description: 29 pages, 32 figures, 41 references
Phonon anomalies associated with spin reorientation in the Kagome ferromagnet Fe3Sn2
Creators: name: He, Ge
name: Peis, Leander
name: Stumberger, Ramona
name: Prodan, Lilian
name: Tsurkan, Vladimir
name: Unglert, Nico
name: Chioncel, Liviu
name: Kézsmárki, István
name: Hackl, Rudi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Polarization- and temperature-dependent Raman data along with theoretical simulations are presented for the Kagome ferromagnet Fe_3Sn_2. Eight out of nine expected phonon modes were identified. The experimental energies compare well with those from the simulations. The analysis of the line widths indicates relatively strong phonon-phonon coupling in the range 0.1 to 1. The temperature-dependent frequencies of three A_{1g} modes show weak anomalies at approximately 100 K. In contrast, the linewidths of all phonon modes follow the conventional exponential broadening up to room temperature except for the softest A_{1g} mode, whose width exhibits a kink close to 100 K and becomes nearly constant for T > 100 K. These features are indicative of a spin reorientation taking place in the temperature range above 100 K which might arise from spin-phonon coupling. The low-energy part of the electronic continuum in E_g symmetry depends strongly on temperature. The possible reasons include particle-hole excitation tracking the resistivity, a spin-dependent gap or spin fluctuations.
description: 9 pages, 5 figures
Fine-grained hand gesture recognition based on active acoustic signal for VR systems
Creators: name: Jiang, Wenhao
name: Li, Si
name: Zhao, Yanchao
name: Tu, Huawei
name: Liu, Chengyong
Publisher: name: La Trobe
Year: 2021
Subjects: classificationCode: 46
subject: Information and computing sciences
classificationCode: 4603
subject: Computer vision and multimedia computation
classificationCode: 4605
subject: Data management and data science
classificationCode: 4608
subject: Human-centred computing

description: Hand gestures are the nature and dominant interaction interfaces for VR systems. The state of the art interaction mechanism for VR system either requires expensive sensing devices or suffers from accuracy issues thus hard to perform versatile interactions. In this paper, we leverage Ultragloves, a low cost interaction system using microphone-implanted gloves to extract the hand gestures. With specifically designed signals, we manage to get both the distance and the directions in a relatively accurate manner. We then design a CNN-LSTM like learning algorithm to extract the gestures. Furthermore, to improve the accuracy of recognition, we also design a filter algorithm to filter out noisy data. The implementation shows that our method can recognize four micro-gestures in the accuracy of 82% by combining phase and frequency features.
Ueda Cosmic Expansion Conjecture — An Intuitive Proposal for Accelerated Odd Sequence Reconstruction of n^4
Creators: name: Ueda, takayuki
Publisher: name: Zenodo
Year: 2025
Subjects: Number theory
奇数列
宇宙膨張
新理論
数学
直感的手法
分裂理論

description: Summary:

This paper proposes the Ueda Cosmic Expansion Conjecture, an intuitive model linking number theory and cosmology.

By expanding odd sequences with dynamic intervals, we reconstruct n^4 with an accelerated structure resembling cosmic inflation.

The method is supported by empirical tests up to n = 100, and code/data for reproducibility is provided.

This conjecture opens a new bridge between prime density, partition theory, and cosmological models.
Can environmental DNA be used to detect first arrivals of the cane toad, Rhinella marina, into novel locations?
Creators: name: Villacorta-Rath, C
name: Adekunle, AI
name: Edmunds, RC
name: Strugnell, Jan
name: Schwarzkopf, L
name: Burrows, D
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: Eradicating invasive species is difficult, but success is more likely when populations are small after arrival. The cane toad, Rhinella marina, is an invasive pest species that threatens native fauna worldwide. Increasingly, environmental DNA (eDNA) is used as a technique to monitor the presence of invasive species given its power to detect low numbers of individuals. We aimed to investigate eDNA persistence in freshwater at three different temperatures (25, 30 and 35°C) and eDNA detection thresholds for R. marina using controlled experiments in aquaria. For the latter, two water volumes and two cane toad exposure times were used (800 or 200 L volume with 5 or 30 min exposure). A 15-ml water sample was collected from each replicated aquaria and preserved with 5 ml Longmire's buffer. Environmental DNA was extracted and four technical quantitative PCR replicates were analyzed targeting the cane toad 16S rDNA mitochondrial gene. Environmental DNA decayed rapidly in water and was reliably detected for up to 3 days after cane toad removal, regardless of the temperature treatment. Also, cane toad eDNA was detected in the water after a 5-min initial exposure of a single individual in 800 L of water. Under the physical parameters tested here, a positive detection means that a cane toad has been in contact with the water body between 1 and 3 days prior to the sampling event. The results of the present study show the importance of eDNA for determining the presence of a species that occurs at low abundance in a small water body, such as at the onset of a cane toad invasion.
A Duty to Protect and Respect: Seneca Opposition to Incorporation during the Removal Period
Creators: name: Haake, Claudia
Publisher: name: La Trobe
Year: 2022
Subjects: classificationCode: 44
subject: Human society
classificationCode: 4408
subject: Political science
subject: FOS: Political science
classificationCode: 47
subject: Language, communication and culture

description: No
description supplied
Measurement of symptom – cognition relationships in schizophrenia
Creators: name: Mervis, Joshua E.
name: Helwig, Nathaniel E.
name: MacDonald, Angus W.
Publisher: name: F1000Research
Year: 2016

description: This poster seeks to address measurement issues with relationships between different constructs in symptom inventories and a cognitive task. The general idea is that the field must seek to understand how differently well-measured constructs as in the RDoC matrix may be measured differently well in generally or at various units of analysis. Ultimately this work seeks to create a coefficient of measurement and a correction technique for method variance and construct coverage.
Continuum field theory for the deformations of planar kirigami
Creators: name: Zheng, Yue
name: Niloy, Imtiar
name: Celli, Paolo
name: Tobasco, Ian
name: Plucinsky, Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Mechanical metamaterials exhibit exotic properties at the system level, that emerge from the interactions of many nearly rigid building blocks. Determining these emergent properties theoretically has remained an open challenge outside of a few select examples. Here, for a large class of periodic and planar kirigami, we provide a coarse-graining rule linking the design of the panels and slits to the kirigami's macroscale deformations. The procedure gives a system of nonlinear partial differential equations (PDE) expressing geometric compatibility of angle functions related to the motion of individual slits. Leveraging known solutions of the PDE, we present excellent agreement between simulations and experiments across kirigami designs. The results reveal a surprising nonlinear wave-type response persisting even at large boundary loads, the existence of which is determined completely by the Poisson's ratio of the unit cell.
description: 5 pages, 4 Figures and a supplement
Deep Lagrangian connectivity in the global ocean inferred from Argo floats
Creators: name: Abernathey, Ryan
name: Bladwell, Christopher
name: Froyland, Gary
name: Sakellariou, Konstantinos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 37N10, 37M99, 76U60, 58J50

description: We describe the application of a new technique from nonlinear dynamical systems to infer the Lagrangian connectivity of the deep global ocean. We approximate the dynamic Laplacian using Argo trajectories from January 2011 to January 2017 and extract the eight dominant coherent (or dynamically self-connected) regions at 1500m depth. Our approach overcomes issues such as sparsity of observed data, and floats continually leaving and entering the dataset; only 10\% of floats record for the full six years. The identified coherent regions maximally trap water within them over the six-year time frame, providing a distinct analysis of the deep global ocean, and relevant information for planning future float deployment. While our study is concerned with ocean circulation at a multi-year, global scale, the dynamic Laplacian approach may be applied at any temporal or spatial scale to identify coherent structures in ocean flow from positional time series information arising from observations or models.
Astuta y verdadera disculpa de un soldado: Digital Edition
Creators: name: Jacsont Pauline
Publisher: name: Zenodo
Year: 2022
Subjects: Spanish literature
Digital edition
XML-TEI

description: Digital edition of a Spanish pliego de cordel (19th c.). It contains the XML-TEI file of the edition, as well as the files that led to this edition, i.e. the digital facsimiles (raw and retouched), and the transcription produced by the OCR tool e-Scriptorium (ALTO-XML). This digital edition is a part of the research project Desenrollando el cordel / Untangling the cordel / Démêler le cordel (2020-2024), led by the professor Constance Carta at the University of Geneva and supported by the philanthropic Sandoz-Monique de Meuron Family Foundation.
Astuta y verdadera disculpa de un soldado: Digital Edition
Creators: name: Jacsont Pauline
Publisher: name: Zenodo
Year: 2024
Subjects: Spanish literature
Digital edition
XML-TEI

description: Digital edition of a Spanish pliego de cordel (19th c.). It contains the XML-TEI file of the edition, as well as the files that led to this edition, i.e. the digital facsimiles (raw and retouched), and the transcription produced by the OCR tool eScriptorium (ALTO-XML). This digital edition is a part of the research project Desenrollando el cordel / Untangling the cordel / Démêler le cordel (2020-2024), led by professor Constance Carta at the University of Geneva and supported by the philanthropic Sandoz-Monique de Meuron Family Foundation.
Fluid-mediated sources of granular temperature at finite Reynolds numbers
Creators: name: Lattanzi, Aaron M.
name: Tavanashad, Vahid
name: Subramaniam, Shankar
name: Capecelatro, Jesse
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We derive analytical solutions for hydrodynamic sources and sinks to granular temperature in moderately dense suspensions of elastic particles at finite Reynolds numbers. Modeling the neighbor-induced drag disturbances with a Langevin equation allows an exact solution for the joint fluctuating acceleration-velocity distribution function $P\left(v^{\prime},a^{\prime};t\right)$. Quadrant-conditioned covariance integrals of $P\left(v^{\prime},a^{\prime};t\right)$ yield the hydrodynamic source and sink that dictate the evolution of granular temperature. Analytical predictions are in agreement with benchmark data obtained from particle-resolved direct numerical simulations and show promise as a general theory from gas--solid to bubbly flows.
O`RTA MAXSUS PROFESSIONAL TA`LIMDA "TIBBIY BIFIZIKA" FANINING AHAMIYATI
Creators: name: Xamroyev, Jobir
Publisher: name: Zenodo
Year: 2024

description: Hozirgi zamon tibbiyotining yutuqlari ko`p jihatdan fizika, texnika va tibbiy asbobsozlikdagi muvaffaqiyatlarga asoslangan. Kasalliklarning tabiati va sog`ayish mexanizmi ko`p hollarda biofizika tushunchalari asosida tushuntiriladi. Shuning uchun tibbiyot texnikumlarining talabalari 1-kursdanoq “Tibbiy biofizika” fanida fizika, texnika, biologik fizika va matematikadan umumiy holda maxsus bilimlarni egallaydilarki, bu fanlarning asosi fizika bo`lib, u tibbiy-biologik masalalarni hal qilishga yo`naltiriladi.
The unicorn and the rhinoceros, not to mention the thesaurus: ontology and discovery in the story of knowledge organization
Creators: name: Broughton, Vanda
Publisher: name: ISKO UK
Year: 2017
Subjects: History of KO
History of Knowledge Organization

description: Knowledge organization has a rich narrative history as well as a broad philosophical foundation. The story of knowledge organization is complex and fascinating, and it is a long one, with the processes of categorizing and labelling finding their roots in the Biblical tradition, and in the world of classical antiquity.  Most knowledge organization enterprises in the ancient and mediaeval period are to do with modelling and making sense of the world; but the principal thread in the narrative really begins in the early modern period, when there was ‘too much to know’, and scholars began to invent means of storing and arranging what they knew about the world.  These early knowledge organization systems were there to document, to represent, to describe, and, most importantly, to retrieve information.

These functions give us a basis for the modern information sciences of bibliography and knowledge organization, and many features of modern KOS can be traced back to their conceptual origins in the seventeenth century, to the work of Wilkins and the universal language compilers, and to Leibniz and the beginnings of knowledge representation. In the twentieth century many of their ideas can be seen to re-emerge in modern ‘scientific’ KOS, in the theories of Otlet and Ranganathan in particular. The line of succession is very apparent here, and the evolving modern theory of knowledge organization can be seen to develop in the writing of a succession of scholars, all of whom are inter-connected, and who contribute to a mature understanding of knowledge organization in the modern age.
Quantum Continual Learning Overcoming Catastrophic Forgetting
Creators: name: Jiang, Wenjie
name: Lu, Zhide
name: Deng, Dong-Ling
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Catastrophic forgetting describes the fact that machine learning models will likely forget the knowledge of previously learned tasks after the learning process of a new one. It is a vital problem in the continual learning scenario and recently has attracted tremendous concern across different communities. In this paper, we explore the catastrophic forgetting phenomena in the context of quantum machine learning. We find that, similar to those classical learning models based on neural networks, quantum learning systems likewise suffer from such forgetting problem in classification tasks emerging from various application scenes. We show that based on the local geometrical information in the loss function landscape of the trained model, a uniform strategy can be adapted to overcome the forgetting problem in the incremental learning setting. Our results uncover the catastrophic forgetting phenomena in quantum machine learning and offer a practical method to overcome this problem, which opens a new avenue for exploring potential quantum advantages towards continual learning.
The Absolute and the Relative in Lukács and Simmel
Creators: name: Lopez, Daniel
Publisher: name: La Trobe
Year: 2022
Subjects: classificationCode: 47
subject: Language, communication and culture
classificationCode: 4705
subject: Literary studies

description: Builds on the author’s earlier Hegelian critique of Lukács’s philosophy of praxis by construing a conceptual dialogue between Lukács and his one-time mentor, Georg Simmel. It is argued that Lukács’s philosophy in the 1920s was partially formed as a metacritique of Simmel’s absolute relativism, as expressed in The Philosophy of Money. However, Lukács’s alternative generates a conceptual mythology that can be diagnosed in Simmelian terms and sublated by the philosophy of life outlined in The View of Life. By situating it in the present, this may de-reify Lukács’s concept of praxis, allowing it to satisfy its ethical and rational duty.
Cards from the Officer of the Watch on the Empress of Canada about weather conditions
Creators: name: Canadian Pacific Steamships. Empress Of Canada
Publisher: name: The University of British Columbia
Year: 2018

description: For 21, 23 and 27 Dec. 1963, and 5, 6, 9, 11, 12, 14, 15, 16 and 17 Jan. 1964.
Spontaneous Chiral Symmetry Breaking in a Random Driven Chemical System
Creators: name: Piñeros, William D.
name: Tlusty, Tsvi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Living systems have evolved to efficiently consume available energy sources using an elaborate circuitry of chemical reactions which, puzzlingly, bear a strict restriction to asymmetric chiral configurations. While autocatalysis is known to promote such chiral symmetry breaking, whether a similar phenomenon may also be induced in a more general class of configurable chemical systems -- via energy exploitation -- is a sensible yet underappreciated possibility. This work examines this question within a model of randomly generated complex chemical networks. We show that chiral symmetry breaking may occur spontaneously and generically by harnessing energy sources from external environmental drives. Key to this transition are intrinsic fluctuations of achiral-to-chiral reactions and tight matching of system configurations to the environmental drives, which together amplify and sustain diverged enantiomer distributions. These asymmetric states emerge through steep energetic transitions from the corresponding symmetric states and sharply cluster as highly-dissipating states. The results thus demonstrate a generic mechanism in which energetic drives may give rise to homochirality in an otherwise totally symmetrical environment, and from an early-life perspective, might emerge as a competitive, energy-harvesting advantage.
Impact of $H_0$ priors on $f(T)$ late time cosmology
Creators: name: Briffa, Rebecca
name: Escamilla-Rivera, Celia
name: Said, Jackson Levi
name: Pullicino, Jurgen Mifsud Nathan Lee
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a detailed analysis of the impact of $H_0$ priors from recent surveys in the literature on the late time cosmology of five $f(T)$ cosmological models using cosmic chronometers, the Pantheon data set, and baryonic acoustic oscillation data. In this work, we use three recently reported values of $H_0$ that have contributed to the recent $H_0$ tension problem. We find that these priors have a strong response in these analyses in terms of all the cosmological parameters. In general, our analyses gives much higher values of $H_0$ when considered against equivalent analyses without priors while, by and large, giving lower values of the matter density parameter. We close with a cross-analysis of each of our model, data set and prior combination choices.
description: 24 pages, 11 figures