cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Squeezing as a probe of the universality hypothesis
Creators: name: Mourão, P. A. L.
name: Costa, H. A. S.
name: Carvalho, P. R. S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We compute analytically the radiative quantum corrections, up to next-to-leading loop order, to the universal critical exponents for both massless and massive O($N$) $λϕ^{4}$ scalar squeezed field theories for probing the universality hypothesis. For that, we employ six distinct and independent methods. The outcomes for the universal squeezed critical exponents obtained through these methods are identical among them and reduce to the conventional ones where squeezing is absent. Although the squeezing mechanism modifies the internal properties of the field, the squeezed critical indices are not affected by the squeezing effect, thus implying the validity of the universality hypothesis, at least at the loop level considered. At the end, we present the corresponding physical interpretation for the results in terms of the geometric symmetry properties of the squeezed field.
description: 19 pages, 26 figures
Weighing the Darkness III: How Gaia Could, but Probably Won't, Astrometrically Detect Free-Floating Black Holes
Creators: name: Andrews, Jeff J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The gravitational pull of an unseen companion to a luminous star is well-known to cause deviations to the parallax and proper motion of a star. In a previous paper in this series, we argue that the astrometric mission Gaia can identify long-period binaries by precisely measuring these arcs. An arc in a star's path can also be caused by a fly-by -- the hyperbolic encounter with another massive object. We quantify the apparent acceleration over time induced by a companion star as a function of the impact parameter, velocity of interaction, and companion mass. In principle, Gaia could be used to astrometrically identify the contribution of massive compact halo objects to the local dark matter potential of the Milky Way. However, after quantifying their rate and Gaia's sensitivity, we find that fly-bys are so rare that Gaia will probably never observe one. Therefore every star in the Gaia database exhibiting astrometric acceleration is likely in a long-period binary with another object. Nevertheless, we show how intermediate mass black holes, if they exist in the Solar Neighborhood, could be detected by the anomalously large accelerations they induce on nearby stars.
description: 8 pages, 5 figures, submitted to ApJ. Comments welcome
Giant shape-memory effect in twisted ferroic nanocomposites
Creators: name: Kim, Donghoon
name: Kim, Minsoo
name: Reidt, Steffen
name: Han, Hyeon
name: Choi, Hongsoo
name: Puigmartí-Luis, Josep
name: Trassin, Morgan
name: Nelson, Bradley J.
name: Chen, Xiang-Zhong
name: Pané, Salvador
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The shape recovery ability of shape-memory alloys vanishes below a critical size (~50nm), which prevents their practical applications at the nanoscale. In contrast, ferroic materials, even when scaled down to dimensions of a few nanometers, exhibit actuation strain through domain switching, though the generated strain is modest (~1%). Here, we develop free-standing twisted architectures of nanoscale ferroic oxides showing shape-memory effect with a giant recoverable strain (>10%). The twisted geometrical design amplifies the strain generated during ferroelectric domain switching, which cannot be achieved in bulk ceramics or substrate-bonded thin films. The twisted ferroic nanocomposites allow us to overcome the size limitations in traditional shape-memory alloys and opens new avenues in engineering large-stroke shape-memory materials for small-scale actuating devices such as nanorobots and artificial muscle fibrils.
Distribution of the k-Multiple Point Range in the Closed Simple Random Walk I
Creators: name: Hoef, Daniel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G50 (Primary) 60C05 60E07 60E10(Secondary)

description: The distribution of the number of points of the closed simple random walk, visited a given number of times (the k-multiple point range) is analysed by a graph based approach. A general expression for the moments is derived. In this paper the joint generating function for dimension one is completely calculated and analysed for large lengths.
The Food Security of Algerian Households in The Light of the Covid-19 Pandemic: An Exploratory Study
Creators: name: Touidjeni, Zinelaabidine
name: Boufalta, Mohamed Seifeddine
name: Mebarki, Louiza
name: Touidjeni, Zinelaabidine
name: Boufalta, Mohamed Seifeddine
name: Mebarki, Louiza
Publisher: name: Unknown
Year: 2022
Subjects: subject: Agricultural and Food Policy
subject: Demand and Price Analysis
subject: Health Economics and Policy
subject: Risk and Uncertainty
subject: Algeria
subject: assessment
subject: COVID-19
subject: food security
subject: households.

description: The study aims to survey a sample of Algerian households’ opinions concerning their food security state under the COVID-19 pandemic. The electronic questionnaire was used as a tool for data collection. The study sample included 638 families distributed in 45 Algerian states. A set of results were reached, the most important are: the majority of households' opinions tended to highly agreed on the food commodities availability by relying mainly on national production during the COVID-19 pandemic period; families in the research sample weakly agreed to the stability of their supply of food commodities during the pandemic; the physical access to food commodities for families was affected differently, most families agreed moderately to their financial ability to obtain food commodities was weak compared to the period before the outbreak, the majority of the research sample agreed to a high degree to the quality and safety of food commodities obtained did not decline during this pandemic.
Learning Dense and Continuous Optical Flow from an Event Camera
Creators: name: Wan, Zhexiong
name: Dai, Yuchao
name: Mao, Yuxin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Event cameras such as DAVIS can simultaneously output high temporal resolution events and low frame-rate intensity images, which own great potential in capturing scene motion, such as optical flow estimation. Most of the existing optical flow estimation methods are based on two consecutive image frames and can only estimate discrete flow at a fixed time interval. Previous work has shown that continuous flow estimation can be achieved by changing the quantities or time intervals of events. However, they are difficult to estimate reliable dense flow , especially in the regions without any triggered events. In this paper, we propose a novel deep learning-based dense and continuous optical flow estimation framework from a single image with event streams, which facilitates the accurate perception of high-speed motion. Specifically, we first propose an event-image fusion and correlation module to effectively exploit the internal motion from two different modalities of data. Then we propose an iterative update network structure with bidirectional training for optical flow prediction. Therefore, our model can estimate reliable dense flow as two-frame-based methods, as well as estimate temporal continuous flow as event-based methods. Extensive experimental results on both synthetic and real captured datasets demonstrate that our model outperforms existing event-based state-of-the-art methods and our designed baselines for accurate dense and continuous optical flow estimation.
description: Project page (https://npucvr.github.io/DCEIFlow/). This work has been accepted by IEEE TIP (https://ieeexplore.ieee.org/document/9950520). 15 pages, 10 figures
Dynamics and electro-rheology of sheared immiscible fluid mixtures
Creators: name: Sakaue, Takahiro
name: Shitara, Kyohei
name: Ohta, Takao
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We analyze the electro-rheological effect in immiscible fluid mixtures with dielectric mismatch. By taking the electric field effect into account, which couples to the dynamics of domain morphology under flow, we propose a set of electro-rheological constitutive equations valid under the condition where the relative magnitude of the flow field is stronger than that of the electric field. Through the comparison with recent experiment, we point out a unique dynamical stress response inherent in situations, where the cross-coupling between different fields is essential.
description: 7 pages, 3 figures
Weak limits in non-linear conductivity
Creators: name: Pedregal, Pablo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: The problem of characterizing weak limits of sequences of solutions for a non-linear diffusion equation of $p$-laplacian type is addressed. It is formulated in terms of certain moments of underlying Young measures associated with main fields corresponding to the non-linear equation. We show two main results. One is a necessary condition; the other one a sufficient counterpart. Unlike the linear case, those two conditions do not match.
The Decay Q Value of Neutrinoless Double Beta Decay
Creators: name: Mei, Dongming
name: Wei, Wenzhao
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: An earlier publication "The implication of the atomic effects in neutrinoless double beta (0$νββ$) decay" written by Mei and Wei has motivated us to compare the decay Q value ($Q_{ββ}$) derived from the decay of the parent nucleus to the daughter nucleus with the two ejected beta particles in the final state to the $Q_{ββ}$ directly derived from the decay of the initial neutral atom to the final state of double-ionized daughter ion with the two ejected beta particles in the final state. We show that the results are the same, which is the mass-energy difference ($ΔMc^2$) subtracted by the total difference of the atomic electron binding energy ($ΔE_{b}$) between the ground states of initial and final neutral atoms. We demonstrate that $ΔMc^2$ is the sum of $Q_{ββ}$ and the atomic relaxation energy ($ΔE_{b}$) of the atomic structure after the decay. Depending on the atomic relaxation time, the release of the atomic binding energy may not come together with the energy deposition of the two ejected beta particles.
description: 5 pages and 3 figures
Flat Bands Arising from Spin-Orbit Assisted Orbital Frustration
Creators: name: Addison, Zachariah
name: Trivedi, Nandini
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present general design principles for engineering and discovering periodic systems with flat bands. Our paradigm exploits spin-orbit assisted orbital frustration on a lattice to produce band structures that contain multiplets of narrowly dispersing bands whose bandwidth is smaller than all other energy scales of the problem including the band gap surrounding the flat bands. We present a series of models in 1D and 2D on various lattices with different intracellular spin-orbit like potentials that hybridize the degrees of freedom in the unit cell. As an alternative to machine learning based exhaustive searches, these design principles and models can be used to search for flat band systems in a variety of physical settings and can be used to investigate the role of weakly dispersing highly orbitally frustrated degrees of freedom in systems where the interactions dominate over the kinetic energy scales of the system.
DEMOCRATIZING ADULT EDUCATION: A CRITICAL ANALYSIS OF THE RELEVANCE OF INTEGRATING TECHNOLOGY IN ADULT EDUCATION FOR NATIONAL DEVELOPMENT IN NIGERIA
Creators: name: Assoc. Prof. Abraham, Oriji (Ph.D; DLS)
name: Dr. Blessing, Chinwe Ovwromoh (Ph.D.)
Publisher: name: TOP Journal
Year: 2024
Subjects: Adult education, National development, Developing Country, Alternative education, and Technology integration.

description: There is no denying the fact that Internet connectivity is steadily increasing globally in all facets of human endeavour. The technological advancements and the integration of these technologies in the education sector have witnessed an exponential increase in all aspects of education, especially for adult literacy, not only in the advanced worlds but in Nigeria as well. It will also not sound hyperbolic to say that there is an alarming magnitude of adult illiteracy in Nigeria today. The situation is continuously on the increase, and has raised concerns among scholars in the field. There is a need to ameliorate the situation by democratizing adult education, and the hope of curtailing it can only be solved through technology integration into adult education delivery that will enable any organized programmes to reach the less privileged citizens in their remotest areas (rural communities) in Nigeria. Consequently, this study focuses and/or highlights the advantages of integrating ICTs in the business of adult education in Nigeria. Furthermore, it assesses how the integration of technology in adult education in Nigeria could enhance national development, and finally attempts to examine the pitfalls of integrating these innovative ideas, and looks into the futuristic use of these new technologies in the education industry.
Activities of the Society: reporting period March 2019 to February 2020
Creators: name: Staudinger, Christa
name: Pachschwöll, Clemens
name: Fischer, Manfred A.
name: Sauberer, Norbert
name: Lefnaer, Stefan
Publisher: name: Zenodo
Year: 2020

description: uploaded for Neiltreichia by Plazi
description: [German title] Aus dem Vereinsleben: Berichtszeitraum März 2019 bis Februar 2020
Further publications: books, checklists, red lists, online resources, and apps
Creators: name: Pachschwöll, Clemens
name: Gilli, Christian
Publisher: name: Zenodo
Year: 2020

description: uploaded for Neiltreichia by Plazi
description: [German title] Literaturhinweise: aktuelle Bücher, Checklisten, Rote Listen, Onlineressourcen und Apps
Book reviews
Creators: name: Fischer, Manfred A.
name: Karrer, Gerhard
name: Pachschwöll, Clemens
name: Zechmeister, Harald
Publisher: name: Zenodo
Year: 2020
Subjects: alien plants
distribution
naturalization
invasive species
taxonomy

description: uploaded for Neiltreichia by Plazi
description: [German title] Buchbesprechungen
Bits missing: Finding exotic pulsars using bfloat16 on NVIDIA GPUs
Creators: name: White, Jack
name: Adamek, Karel
name: Roy, Jayanta
name: Dimoudi, Sofia
name: Ransom, Scott M.
name: Armour, Wesley
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Fourier Domain Acceleration Search (FDAS) is an effective technique for detecting faint binary pulsars in large radio astronomy datasets. This paper quantifies the sensitivity impact of reducing numerical precision in the GPU accelerated FDAS pipeline of the AstroAccelerate software package. The prior implementation used IEEE-754 single-precision in the entire binary pulsar detection pipeline, spending a large fraction of the runtime computing GPU accelerated FFTs. AstroAccelerate has been modified to use bfloat16 (and IEEE754 double-precision to provide a "gold standard" comparison) within the Fourier domain convolution section of the FDAS routine. Approximately 20,000 synthetic pulsar filterbank files representing binary pulsars were generated using SIGPROC with a range of physical parameters. They have been processed using bfloat16, single and double-precision convolutions. All bfloat16 peaks are within 3% of the predicted signal-to-noise ratio of their corresponding single-precision peaks. Of 14,971 "bright" single-precision fundamental peaks above a power of 44.982 (our experimentally measured highest noise value), 14,602 (97.53%) have a peak in the same acceleration and frequency bin in the bfloat16 output plane, whilst in the remaining 369 the nearest peak is located in the adjacent acceleration bin. There is no bin drift measured between the single and double-precision results. The bfloat16 version of FDAS achieves a speedup of approximately 1.6x compared to single-precision. A comparison between AstroAccelerate and the PRESTO software package is presented using observations collected with the GMRT of PSR J1544+4937, a 2.16ms black widow pulsar in a 2.8 hour compact orbit.
Modelling time delays from two reprocessors in active galactic nuclei
Creators: name: Jaiswal, Vikram Kumar
name: Prince, Raj
name: Panda, Swayamtrupta
name: Czerny, Bożena
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Context. Continuum time delays from accretion disks in active galactic nuclei (AGN) has been proposed long time ago as a tool for measuring distances to the monitored sources. However, the method faces serious problems as a number of effects must be taken into account, including the contribution from the Broad Line Region (BLR). Aims. In this paper, we model the expected time delays when both the disk reprocessing of the incident X-ray flux and further reprocessing by the BLR are included, with the aim to see if the two effects can be disentangled. Methods. We use simple response function for the accretion disk, without relativistic effects, and we use a parametric description to account for the BLR contribution. We include only scattering of the disk emission by the BLR inter-cloud medium. We also use artificial lightcurves with 1-day sampling to check if the effects are likely to be seen in real data. Results. We show that the effect of the BLR scattering on the predicted time delay is very similar to the effect of rising height of the X-ray source, without any BLR contribution. This brings additional degeneracy if we want in the future to recover the parameters of the system from the observed time delays in a specific object. Both effects, however, modify the slope of the delay versus wavelength curve when plotted in log space which opens a way to obtaining bare disk time delay needed for cosmology. In addition, when the disk irradiation is strong, the modification of the predicted delay by the BLR scattering and by X-ray source height become considerably different. However, the required data quality must be high since our artificial curves with 1-day sampling give rather noisy results.
description: 14 pages, 16 figures, and 1 table. Published in A&A. Comments are welcome
A new measurement method of electrode gains for orthogonal symmetric type beam position monitor
Creators: name: Zou, J. Y.
name: Wu, F. F
name: Yang, Y. L.
name: Sun, B. G.
name: Zhou, Z. R.
name: Luo, Q.
name: Lu, P.
name: Xu, H. L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The new beam position monitor (BPM) system of the injector at the upgrade project of Hefei Light Source (HLS II) has 19 stripline beam position monitors. Most consist of four orthogonal symmetric stripline electrodes. The differences in electronic gain and mismachining tolerance can cause the change of the beam response of the BPM electrodes. This variation will couple the two measured horizontal positions in order to bring the measuring error. To alleviate this effect, a new technique to measure the relative response of the four electrodes has been developed. It is irrelevant to the beam charge and the related coefficient can be theoretical calculated. The effect of electrodes coupling on this technique is analyzed. The calibration data is used to fit the gain for all 19 injector beam position monitors. The results show the standard deviation of the distribution of measured gains is about 5%.
description: 5 pages, 6 figures, submitted to 'Chinese Physics C'
Scintillation Minimization versus Intensity Maximization in Optimal Beams- Supplementary Material
Creators: name: Nair, Anjali
name: Li, Qin
name: Stechmann, Samuel
Publisher: name: figshare
Year: 2022
Subjects: subject: 80205 Numerical Computation
subject: FOS: Computer and information sciences
subject: 20501 Classical and Physical Optics
subject: FOS: Physical sciences

description: This article provides supporting content for the main article titled `Scintillation Minimization versus Intensity Maximization in Optimal Beams'
Lévy flights in inhomogeneous environments and 1/f noise
Creators: name: Kazakevicius, Rytis
name: Ruseckas, Julius
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Complex dynamical systems which are governed by anomalous diffusion often can be described by Langevin equations driven by Lévy stable noise. In this article we generalize nonlinear stochastic differential equations driven by Gaussian noise and generating signals with 1/f power spectral density by replacing the Gaussian noise with a more general Lévy stable noise. The equations with the Gaussian noise arise as a special case when the index of stability alpha=2. We expect that this generalization may be useful for describing 1/f fluctuations in the systems subjected to Lévy stable noise.
Supernova Light Curves Approximation based on Neural Network Models
Creators: name: Demianenko, Mariia
name: Samorodova, Ekaterina
name: Sysak, Mikhail
name: Shiriaev, Aleksandr
name: Malanchev, Konstantin
name: Derkach, Denis
name: Hushchyn, Mikhail
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Photometric data-driven classification of supernovae becomes a challenge due to the appearance of real-time processing of big data in astronomy. Recent studies have demonstrated the superior quality of solutions based on various machine learning models. These models learn to classify supernova types using their light curves as inputs. Preprocessing these curves is a crucial step that significantly affects the final quality. In this talk, we study the application of multilayer perceptron (MLP), bayesian neural network (BNN), and normalizing flows (NF) to approximate observations for a single light curve. We use these approximations as inputs for supernovae classification models and demonstrate that the proposed methods outperform the state-of-the-art based on Gaussian processes applying to the Zwicky Transient Facility Bright Transient Survey light curves. MLP demonstrates similar quality as Gaussian processes and speed increase. Normalizing Flows exceeds Gaussian processes in terms of approximation quality as well.
description: 5 pages, 2 figures and 2 tables
A Survey of Family Unification Models with Bifundamental Matter
Creators: name: Sheridan, Elijah
name: Kephart, Thomas W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Extensions of the Standard Model have been attempted from the bottom up and from the top down yet there remains a largely unexplored middle ground. In this paper, using the Mathematica package LieART, we exhaustively enumerate embeddings of the Standard Model within the class of theories with bifundamental fermions in product gauge group SU(a)XSU(b)XSU(c) with no more generators than E6, while achieving SM family unification rather than replication. We incorporate simple phenomenological constrains and find 151 unique models, including 9 that have only vector-like particle content beyond-the-Standard Model (BSM) particles, which we conjecture belong to 5 infinite families of such models. We describe the potentially most viable models: namely, the 9 with strictly vector-like BSM content along with the 29 models we found with no more than 30 additional BSM chiral particles. These include models with fractional electric charge color singlets, and hence magnetic monopoles with multiple Dirac charge. This latter collection of models predicts chiral particles with masses near the electroweak scale accessible to current and future collider experiments.
description: 29 pages, 7 figures
Constraining nPDFs with inclusive pions and direct photons at forward rapidities in p+Pb collisions at the LHC
Creators: name: Helenius, Ilkka
name: Eskola, Kari J.
name: Paukkunen, Hannu
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this talk, we present NLO pQCD predictions for inclusive pion and direct photon nuclear modifications in p+Pb collisions at mid- and forward rapidities at the LHC. In addition to the minimum bias predictions, we also address the centrality dependence with spatially dependent nuclear PDFs. To understand which regions of the nuclear momentum fraction $x_2$ these observables predominantly probe, we present also the underlying $x_2$ distributions at different rapidities. We are led to conclude that the isolated photons at forward rapidities are more sensitive to the small-$x_2$ dynamics than the inclusive pions.
description: 4 pages, 5 figures. Prepared for the Proceedings of "Hard Probes 2013", the 6th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Stellenbosch, South Africa, November 4-8, 2013
Mode locking of hole spin coherences in CsPb(Cl,Br)$_3$ perovskite nanocrystals
Creators: name: Kirstein, E.
name: Kopteva, N. E.
name: Yakovlev, D. R.
name: Zhukov, E. A.
name: Kolobkova, E. V.
name: Kuznetsova, M. S.
name: Belykh, V. V.
name: Yugova, I. A.
name: Glazov, M. M.
name: Bayer, M.
name: Greilich, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The spin physics of perovskite nanocrystals with confined electrons or holes is attracting increasing attention, both for fundamental studies and spintronic applications. Here, stable CsPb(Cl$_{0.5}$Br$_{0.5}$)$_3$ lead halide perovskite nanocrystals embedded in a fluorophosphate glass matrix are studied by time-resolved optical spectroscopy to unravel the coherent spin dynamics of holes and their interaction with nuclear spins of the $^{207}$Pb isotope. We demonstrate the spin mode locking effect provided by the synchronization of the Larmor precession of single hole spins in each nanocrystal in the ensemble that are excited periodically by a laser in an external magnetic field. The mode locking is enhanced by nuclei-induced frequency focusing. An ensemble spin dephasing time $T_2^*$ of a nanosecond and a single hole spin coherence time of $T_2=13\,$ns are measured. The developed theoretical model accounting for the mode locking and nuclear focusing for randomly oriented nanocrystals with perovskite band structure describes the experimental data very well.
description: Main paper of 9 pages and 3 figures. Supplementary material of 16 pages and 12 figures
Coupled Orbit-Attitude Dynamics of High Area-to-Mass Ratio (HAMR) Objects: Influence of Solar Radiation Pressure, Earth's Shadow and the Visibility in Light Curves
Creators: name: Frueh, Carolin
name: Jah, Moriba
name: Kelecy, Thomas
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The orbital and attitude dynamics of uncontrolled Earth orbiting objects are perturbed by a variety of sources. In research, emphasis has been put on operational space vehicles. Operational satellites typically have a relatively compact shape, and hence, a low area-to-mass ratio (AMR), and are in most cases actively or passively attitude stabilized. This enables one to treat the orbit and attitude propagation as decoupled problems, and in many cases the attitude dynamics can be neglected completely. The situation is different for space debris objects, which are in an uncontrolled attitude state. Furthermore, the assumption that a steady-state attitude motion can be averaged over data reduction intervals may no longer be valid. Additionally, a subset of the debris objects have significantly high area-to-mass ratio values, resulting in highly perturbed orbits, e.g. by solar radiation pressure, even if a stable AMR value is assumed. This assumption implies a steady-state attitude such that the average cross-sectional area exposed to the sun is close to constant. Time-varying solar radiation pressure accelerations due to attitude variations will result in un-modeled errors in the state propagation. This work investigates the evolution of the coupled attitude and orbit motion of HAMR objects. Standardized pieces of multilayer insulation are simulated in near geosynchronous orbits. It is assumed that the objects are rigid bodies and are in uncontrolled attitude states. The integrated effects of the Earth gravitational field and solar radiation pressure on the attitude motion are investigated. The light curves that represent the observed brightness variations over time in a specific viewing direction are extracted. A sensor model is utilized to generate light curves with visibility constraints and magnitude uncertainties as observed by a standard ground based telescope.
Towards knowledge-based mining of mental disorder patterns from textual data
Creators: name: Shahabikargar, Maryam
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: Mental health disorders may cause severe consequences on all the countries’ economies and health. For example, the impacts of the COVID-19 pandemic, such as isolation and travel ban, can make us feel depressed. Identifying early signs of mental health disorders is vital. For example, depression may increase an individual’s risk of suicide. The state-of-the-art research in identifying mental disorder patterns from textual data, uses hand-labelled training sets, especially when a domain expert’s knowledge is required to analyse various symptoms. This task could be time-consuming and expensive. To address this challenge, in this dissertation, we study and analyse the various clinical and non-clinical approaches to identifying mental health disorders. We leverage the domain knowledge and expertise in cognitive science to build a domain-specific Knowledge Base (KB) for the mental health disorder concepts and patterns. We present a weaker form of supervision by facilitating the generating of training data from a domain-specific Knowledge Base (KB). We adopt a typical scenario for analysing social media to identify major depressive disorder symptoms from the textual content generated by social users. We use this scenario to evaluate how our knowledge-based approach significantly improves the quality of results.
The Transition Matrix Element A_{gq}(N) of the Variable Flavor Number Scheme at O(α_s^3)
Creators: name: Ablinger, J.
name: Blümlein, J.
name: De Freitas, A.
name: Hasselhuhn, A.
name: von Manteuffel, A.
name: Round, M.
name: Schneider, C.
name: Wissbrock, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the massive operator matrix element $A_{gq}^{(3)}(N)$ to 3-loop order in Quantum Chromodynamics at general values of the Mellin variable $N$. This is the first complete transition function needed in the variable flavor number scheme obtained at $O(α_s^3)$. A first independent recalculation is performed for the contributions $\propto N_F$ of the 3-loop anomalous dimension $γ_{gq}^{(2)}(N)$.
description: 25 pages Latex, 2 style files
Overseas Filipino Workers' Behavioral Intent for Healthy Lifestyles as Influenced by Corporate Communication Materials in Dubai, United Arab Emirates
Creators: name: Gerio, Joanne C.
Publisher: name: Zenodo
Year: 2018
Subjects: OFW
Healthy Lifestyle
Corporate Communication Materials

description: One hundred selected OFWs employed in a private company in Dubai, U.A.E. were surveyed on how corporate communication materials influence their behavioral intention to adopt healthy lifestyles. Premised on the Theory of Reasoned Action by Fishbein and Azjen (1980), the study described how independent variables ( printed and electronic corporate communication materials) with the mediating variables (attitude, subjective norms, and perception) influence the dependent variable (OFWs'behavioral intention) to adopt healthy lifestyles. Descriptive statistics such as frequency distribution and percentages were used to describe results. Data analysis shows that OFWs' perception towards corporate communication materials was positively accepted; OFWs' attitude when exposed to communication materials was found to be favourable; subjective norms that influence OFWs' behavioral intention was the social group or organization they belong to. These positive and favorable results led to moderate behavioral intention to adopt healthy lifestyles as influenced by corporate communication materials.
Stability of pattern formation in systems with dynamic source regions
Creators: name: Majka, M.
name: Ho, R. D. J. G.
name: Zagorski, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We explain the principles of gene expression pattern stabilization in systems of interacting, diffusible morphogens, with dynamically established source regions. Using a reaction-diffusion model with step-function production term, we identify the phase transition between low-precision indeterminate patterning and the phase in which a traveling, well-defined contact zone between two domains is formed. Our model analytically explains single- and two-gene domain dynamics and provides pattern stability conditions for all possible two-gene regulatory network motifs.
description: Final version, accepted for Physical Review Letters: https://journals.aps.org/prl/accepted/b307fYeeG7f1d48b152574e5e76e468c53a954a62
3D MHD simulation of linearly polarised Alfven wave dynamics in Arnold-Beltrami-Childress magnetic field
Creators: name: Tsiklauri, D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Previous studies [Malara et al ApJ, 533, 523 (2000)] considered small-amplitude Alfven wave (AW) packets in Arnold-Beltrami-Childress (ABC) magnetic field using WKB approximation. In this work linearly polarised Alfven wave dynamics in ABC magnetic field via direct 3D MHD numerical simulation is studied for the first time. Gaussian AW pulse with length-scale much shorter than ABC domain length and harmonic AW with wavelength equal to ABC domain length are studied for four different resistivities. While it is found that AWs dissipate quickly in the ABC field, surprisingly, AW perturbation energy increases in time. In the case of the harmonic AW perturbation energy growth is transient in time, attaining peaks in both velocity and magnetic perturbation energies within timescales much smaller than resistive time. In the case of the Gaussian AW pulse velocity perturbation energy growth is still transient in time, attaining a peak within few resistive times, while magnetic perturbation energy continues to grow. It is also shown that the total magnetic energy decreases in time and this is governed by the resistive evolution of the background ABC magnetic field rather than AW damping. On contrary, when background magnetic field is uniform, the total magnetic energy decrease is prescribed by AW damping, because there is no resistive evolution of the background. By considering runs with different amplitudes and by analysing perturbation spectra, possible dynamo action by AW perturbation-induced peristaltic flow and inverse cascade of magnetic energy have been excluded. Therefore, the perturbation energy growth is attributed to a new instability. The growth rate appears to be dependent on the value of the resistivity and spatial scale of the AW disturbance. Thus, when going beyond WKB approximation, AW damping, described by full MHD equations, does not guarantee decrease of perturbation energy.
description: Accepted for publication in Phys. Plasmas, Volume 21, Issue 5, MAY 2014
High-Density Cobalt Single-Atom Catalysts for Enhanced Oxygen Evolution Reaction
Creators: Pawan Kumar
Publisher: name: University of Alberta Library
Year: 2023

Single atom catalysts (SACs) possess unique catalytic properties due to low-coordination and unsaturated active sites. However, the demonstrated performance of SACs is limited by low SAC loading, poor metal–support interactions, and nonstable performance. Herein, we report a macromolecule-assisted SAC synthesis approach that enabled us to demonstrate high-density Co single atoms (10.6 wt % Co SAC) in a pyridinic N-rich graphenic network. The highly porous carbon network (surface area of ∼186 m2 g–1) with increased conjugation and vicinal Co site decoration in Co SACs significantly enhanced the electrocatalytic oxygen evolution reaction (OER) in 1 M KOH (η10 at 351 mV; mass activity of 2209 mA mgCo–1 at 1.65 V) with more than 300 h stability. Operando X-ray absorption near-edge structure demonstrates the formation of electron-deficient Co-O coordination intermediates, accelerating OER kinetics. Density functional theory (DFT) calculations reveal the facile electron transfer from cobalt to oxygen species-accelerated OER.
Acceleration statistics in thermally driven superfluid turbulence
Creators: name: Baggaley, Andrew W.
name: Barenghi, Carlo F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: New methods of flow visualization near absolute zero have opened the way to directly compare quantum turbulence (in superfluid helium) to classical turbulence (in ordinary fluids such as air or water) and explore analogies and differences. We present results of numerical simulations in which we examine the statistics of the superfluid acceleration in thermal counterflow. We find that, unlike the velocity, the acceleration obeys scaling laws similar to classical turbulence, in agreement with a recent quantum turbulence experiment of La Mantia et al.
description: 5 pages, 5 figures, to appear in PRE
Jumping spider exploration: costs of ant-mimicry and lab lockdowns
Creators: name: Herbert, Jessica
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: This thesis investigates exploratory behaviours in jumping spiders in two different contexts: ant-mimicry and laboratory lockdowns. Both trials used an open arena and novel object task. Theory suggests that perfect mimicry is the ideal phenotype to maximise predator protection, yet imperfect mimicry is common in nature. I tested a number of existing hypotheses suggesting costs that may inhibit perfect mimicry by comparing exploration behaviour in 'good' mimicking and non-mimicking spiders. My results showed mimics were more exploratory than non-mimics, insinuating that mimicry does not impose a cost on explorative behaviour. Laboratory conditions affect multiple aspects of spider behaviour and physiology, yet spiders are often kept in laboratories for extended periods before testing. I tested field-caught spiders before and after a 6-week laboratory stay to assess how these stays affected their explorative behaviour and body condition. I provided half the spiders with physical enrichment and deprived the others to see if this affected exploration levels. Spiders were less exploratory in the final trials, and physical enrichment had no effect on behaviours. Spider condition remained constant between trials. If spiders are affected by laboratory conditions, then this should affect how we interpret previous results and design future studies.
Variational Quantum Approximate Support Vector Machine with Inference Transfer
Creators: name: Park, Siheon
name: Park, Daniel K.
name: Rhee, June-Koo Kevin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: A kernel-based quantum classifier is the most practical and influential quantum machine learning technique for the hyper-linear classification of complex data. We propose a Variational Quantum Approximate Support Vector Machine (VQASVM) algorithm that demonstrates empirical sub-quadratic run-time complexity with quantum operations feasible even in NISQ computers. We experimented our algorithm with toy example dataset on cloud-based NISQ machines as a proof of concept. We also numerically investigated its performance on the standard Iris flower and MNIST datasets to confirm the practicality and scalability.
description: 16 pages, 4 figures
Handlungsmöglichkeiten durch Sport und Soziale Arbeit: Ein Beitrag zur Begleitung devianter Jugendlicher bei der Bewältigung ihrer Entwicklungsaufgaben
Creators: name: Delacroix, Etienne
name: Lindenthal, Niklas
name: Schaller, Johannes
Publisher: name: Zenodo
Year: 2022

description: Um aufzuzeigen, wie das gesundheitsfördernde Potential von Sport in der Sozialen Arbeit verstärkt genutzt werden kann, wird in dieser Arbeit, mit dem Titel «Handlungsmöglichkeiten durch Sport und Soziale Arbeit - Ein Beitrag zur Begleitung devianter Jugendlicher bei der Bewältigung ihrer Entwicklungsaufgaben», anhand devianter Jugendlicher aufgezeigt, wie diese über die positiven Wirkungen von Sport ihre Entwicklungsaufgaben besser bewältigen können. Um deviante Jugendliche bei der Bewältigung ihrer Entwicklungsaufgaben zu unterstützen, bedarf es, laut den Autoren Etienne Delacroix, Niklas Lindenthal und Johannes Schaller, einer professionellen Begleitung, welche gewisse Rahmenbedingungen beachten muss. Zwischen Fachpersonen der Sozialen Arbeit und devianten Jugendlichen bestehen bereits viele Berührungspunkte. Somit bietet sich eine Begleitung oder eine Initiierung eines Sportangebots durch Professionelle der Sozialen Arbeit an. Die gemeinsame Zusammenarbeit zwischen Sozialer Arbeit, Sportangeboten, den Jugendlichen und dessen sozialem Umfeld verfolgt das Ziel die Jugendlichen auf persönlicher Ebene zu fördern und sie bei der gesellschaftlichen Integration zu unterstützen. Die Handlungsempfehlungen sollen dem Berufsfeld der Sozialen Arbeit als Inspiration dienen und aufzeigen, dass eine praktische Umsetzung der sportorientierten Ansätze in Verbindung mit Theorien und Methoden der Sozialen Arbeit in der Praxis umsetzbar ist. Die Profession der Sozialen Arbeit wird in die Verantwortung genommen, das Potential von Sport zu nutzen und das Thema konkreter zu vertiefen.
description: + Code Diss LU: hslusa bask + Code Diss LU: hslusa basa + Code Diss LU: hslusa basp + Fussnote: Bachelor-Arbeit, Hochschule Luzern – Soziale Arbeit, Studienrichtung Soziokultur, Sozialarbeit & Sozialpädagogik, 2022 + NL-Code: NLLUHSA202209
Twisted bilayer BC$_3$: Valley interlocked anisotropic flat bands
Creators: name: Kariyado, Toshikaze
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Here we propose BC$_3$, a graphene derivative that has been synthesized, as a platform to realize exotic quantum phases by introducing a moiré pattern with mismatched stacking. In twisted bilayer BC$_3$, it is shown that a crossover from two-dimensional to quasi one-dimensional band structure takes place with the twist angle as a control parameter. This is a typical manifestation of the guiding principle in van der Waals stacked systems: the quantum interference between Bloch wave functions in adjacent layers has a striking effect on the effective interlayer tunneling. Interestingly, quasi one-dimensionalization happens in a valley dependent manner. Namely, there is interlocking between the valley index and the quasi-1D directionality, which makes BC$_3$ a plausible candidate for valleytronics devices. In addition, the strongly correlated regime of the valley interlocked quasi-1D state reduces to an interesting variant of the Kugel-Khomskii model where intertwined valley and spin degrees of freedom potentially induces exotic quantum phases. Notably, this variant of the Kugel-Khomskii model cannot be realized in conventional solids due to the three fold valley degeneracy.
Bipartite entanglement and the arrow of time
Creators: name: Frembs, Markus
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We provide a new perspective on the close relationship between entanglement and time. Our main focus is on bipartite entanglement, where this connection is foreshadowed both in the positive partial transpose criterion due to Peres [A. Peres, Phys. Rev. Lett., 77, 1413 (1996)] and in the classification of quantum within more general non-signalling bipartite correlations [M. Frembs and A. Döring, arXiv:2204.11471]. Extracting the relevant common features, we identify a necessary and sufficient condition for bipartite entanglement in terms of a compatibility condition with respect to time orientations in local observable algebras, which express the dynamics in the respective subsystems. We discuss the relevance of the latter in the broader context of von Neumann algebras and the thermodynamical notion of time naturally arising within the latter.
description: 16 pages
The conductivity of the half filled Landau level
Creators: name: Iordanski, S. V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: It is shown that the thermodynamic instability at the half filling of Ll leads to the vortex lattice formation with the electronic spectrum analogous to that of graphene with two Dirac Fermi points on Brillouin cell boundary. This result is used for the explanation of the observed current generated by SAW in the heterostructure on the surface of piezoelectric GaAs. Using the existence of two Fermi points instead Fermi surface suggested in the previous theoretical works, permit the explanation of the experimental results.