cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Symmetry reduction for deep reinforcement learning active control of chaotic spatiotemporal dynamics
Creators: name: Zeng, Kevin
name: Graham, Michael D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Deep reinforcement learning (RL) is a data-driven, model-free method capable of discovering complex control strategies for macroscopic objectives in high-dimensional systems, making its application towards flow control promising. Many systems of flow control interest possess symmetries that, when neglected, can significantly inhibit the learning and performance of a naive deep RL approach. Using a test-bed consisting of the Kuramoto-Sivashinsky Equation (KSE), equally spaced actuators, and a goal of minimizing dissipation and power cost, we demonstrate that by moving the deep RL problem to a symmetry-reduced space, we can alleviate limitations inherent in the naive application of deep RL. We demonstrate that symmetry-reduced deep RL yields improved data efficiency as well as improved control policy efficacy compared to policies found by naive deep RL. Interestingly, the policy learned by the the symmetry aware control agent drives the system toward an equilibrium state of the forced KSE that is connected by continuation to an equilibrium of the unforced KSE, despite having been given no explicit information regarding its existence. I.e., to achieve its goal, the RL algorithm discovers and stabilizes an equilibrium state of the system. Finally, we demonstrate that the symmetry-reduced control policy is robust to observation and actuation signal noise, as well as to system parameters it has not observed before.
description: Submitted to Physical Review E
Effects of cognitive training on fall risk and cognitive performance in individuals with mild cognitive impairment
Creators: name: Cattaleeya Sittichoke
name: Sirinun Boripuntakul
name: Puangsoi Worakul
name: Somporn Sungkarat
Publisher: name: Faculty of Associated Medical Sciences, Chiang Mai University
Year: 2020
Subjects: Cognitive function
falls
mild cognitive impairment
training program

description: Journal of Associated Medical Sciences, 53, 3, 92-99
Physics-constrained Deep Learning for Robust Inverse ECG Modeling
Creators: name: Xie, Jianxin
name: Yao, Bing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The rapid developments in advanced sensing and imaging bring about a data-rich environment, facilitating the effective modeling, monitoring, and control of complex systems. For example, the body-sensor network captures multi-channel information pertinent to the electrical activity of the heart (i.e., electrocardiograms (ECG)), which enables medical scientists to monitor and detect abnormal cardiac conditions. However, the high-dimensional sensing data are generally complexly structured and realizing the full data potential depends to a great extent on advanced analytical and predictive methods. This paper presents a physics-constrained deep learning (P-DL) framework for high-dimensional inverse ECG modeling. This method integrates the physical laws of the complex system with the advanced deep learning infrastructure for effective prediction of the system dynamics. The proposed P-DL approach is implemented to solve the inverse ECG model and predict the time-varying distribution of electric potentials in the heart from the ECG data measured by the body-surface sensor network. Experimental results show that the proposed P-DL method significantly outperforms existing methods that are commonly used in current practice.
Quantum spin correlations in an organometallic alternating sign chain
Creators: name: Stone, M. B.
name: Tian, W.
name: Lumsden, M. D.
name: Granroth, G. E.
name: Mandrus, D.
name: Chung, J. -H.
name: Harrison, N.
name: Nagler, S. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: High resolution inelastic neutron scattering is used to study excitations in the organometallic magnet DMACuCl$_3$. The correct magnetic Hamiltonian describing this material has been debated for many years. Combined with high field bulk magnetization and susceptibility studies, the new results imply that DMACuCl$_3$ is a realization of the $S=1/2$ alternating antiferromagnetic-ferromagnetic (AFM-FM) chain. Coupled-cluster calculations are used to derive exchange parameters, showing that the AFM and FM interactions have nearly the same strength. Analysis of the scattering intensities shows clear evidence for inter-dimer spin correlations, in contrast to existing results for conventional alternating chains. The results are discussed in the context of recent ideas concerning quantum entanglement.
description: 5 pages, 4 figures included in text. Submitted to APS Journals
T&D 2022 panel session: Enhancing Grid Resilience with HVDC and FACTS
Creators: B. Johnson
R. Adapa
N. Kirby
S. Kynev
R. Nuqui
Publisher: name: IEEE
Year: 2022

Session Overview: � Discuss Ability of HVDC and FACTS to improve the resilience of the bulk power system � Have their own control systems     - Can interface to utility through communication/control     - HVDC systems often have dedicated communication systems � High MVA ratings can have significant impact on power system operation with fast controls
Session Overview:
� Discuss Ability of HVDC and FACTS to improve the resilience of the bulk power system
� Have their own control systems
    - Can interface to utility through communication/control
    - HVDC systems often have dedicated communication systems
� High MVA ratings can have significant impact on power system operation with fast controls
Collective modes in anisotropic plasmas
Creators: name: Carrington, Margaret E.
name: Forster, Bailey M.
name: Makar, Sofiya
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study collective modes in anisotropic plasmas of quarks and gluons using a quasi-particle picture and a hard loop approximation. We use a general class of anisotropic distribution functions, and we consider chirally asymmetric systems. We introduce a complete tensor basis to decompose the gluon polarization tensor into a set of nine scalar functions. We derive and solve the corresponding dispersion equations. Imaginary modes are particularly important because of their potential influence on plasma dynamics. We explore in detail their dependence on the chiral chemical potential and the parameters that characterise the anisotropy of the system. We show that our generalized distributions produce dispersion relations that are much richer in structure than those obtained with a simple one parameter deformation of an isotropic distribution. In addition, the size and domain of the imaginary solutions are enhanced, relative to those obtained with a one parameter deformation. Finally, we show that the influence of even a very small chiral chemical potential is significantly magnified when anisotropy is present.
description: 31 pages, 13 figures, published version
Entanglement, BEC, and superfluid-like behavior of two-mode photon systems
Creators: name: de Pasquale, Ferdinando
name: Giorgi, Gian Luca
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A system of two interacting photon modes, without constraints on the photon number, in the presence of a Kerr nonlinearity, exhibits BEC if the transfer amplitude is greater than the mode frequency. A symmetry-breaking field (SBF) can be introduced by taking into account a classical electron current. The ground state, in the limit of small nonlinearity, becomes a squeezed state, and thus the modes become entangled. The smaller is the SBF, the greater is entanglement. Superfluid-like behavior is observed in the study of entanglement growth from an initial coherent state, since in the short-time range the growth does not depend on the SBF amplitude, and on the initial state amplitude. On the other hand, the latter is the only parameter which determines entanglement in the absence of the SBF.
Slides for: Channel State Information Acquisition for Intelligent Reflecting Surface-Assisted mmWave/THz Systems
Creators: Dr. Peilan Wang
Dr. Jun Fang
Publisher: name: IEEE
Year: 2022

Slides for: SPS Webinar, October 14, 2022, Dr. Peilan Wang, Dr. Jun Fang
Intelligent reflecting surface, or IRS, has recently emerged as a promising paradigm for future wireless communications. Owing to its remarkable capability in reshaping the propagation environment, IRS has a great potential to boost spectral efficiency, mitigate interference, and enhance physical security. Channel state information acquisition is essential for the operation of IRS-assisted communication systems, which is very challenging due to the massive channel size and the passive nature of IRS. This seminar focuses on channel estimation for IRS-assisted millimeter-wave/terahertz systems. We first introduce the concept of cascade channel that is used to model the multiplicative relation between the two physical channels, namely the base station-to-IRS and IRS-to-user channels. Many transceivers optimization tasks, such as joint active and passive beamforming, require the knowledge of the cascade channel matrix, which in general, has a very large dimension and would entail a substantial amount of training data for estimation. To address this problem, we unveil some inherent sparse/low-rank structure of millimeter-wave/terahertz cascade channels. This enables the development of efficient compressed sensing-based channel estimation and beam alignment methods with significantly reduced training requirement. At the end of this talk, we will discuss some future research directions and challenges related to this topic.
Rich polymorphism of a rod-like liquid crystal (8CB) confined in two types of unidirectional nanopores
Creators: name: Guégan, Régis
name: Morineau, Denis
name: Lefort, Ronan
name: Béziel, Wilfried
name: Guendouz, Mohammed
name: Noirez, Laurence
name: Henschel, Anke
name: Huber, Patrick
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We present a neutron and X-rays scattering study of the phase transitions of 4-n-octyl-4'-cyanobiphenyl (8CB) confined in unidirectional nanopores of porous alumina and porous silicon (PSi) membranes with an average diameter of 30 nm. Spatial confinement reveals a rich polymorphism, with at least four different low temperature phases in addition to the smectic A phase. The structural study as a function of thermal treatments and conditions of spatial confinement allows us to get insights into the formation of these phases and their relative stability. It gives the first description of the complete phase behavior of 8CB confined in PSi and provides a direct comparison with results obtained in bulk conditions and in similar geometric conditions of confinement but with reduced quenched disorder effects using alumina anopore membranes
description: Accepted in EPJ E - Soft Matter
Wormhole solutions in $f(R)$ Gravity
Creators: name: Mishra, B.
name: Agrawal, A. S.
name: Ray, S. K. Tripathy. Saibal.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work, we have studied the traversable wormholes geometry in $f(R)$ theory gravity, where $R$ be the Ricci scalar. The wormhole solution for some assumed $f(R)$ functions have been presented. The assumption of $f(R)$ is based on the fact that its behaviour changed with an assumed parameter $α$ rather than the deceleration parameter. Three models are presented based on the physically motivated shape function and their behaviours are studied.
description: 12 pages, 12 figures, Accepted Version IJMPD
BO'LAJAK PEDAGOGLARNING REFLEKTIV FAOLIYATINI RIVOJLANTIRISHDA AKMEOLOGIK YONDASHUV
Creators: name: Ravshanova, Mohinur
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada bo‘lajak pedagoglarning reflektiv faoliyatini rivojlantirishda akmeologik yondashuvning nazariy asoslari va amaliy ahamiyati tahlil qilinadi. Refleksiya – bu o‘z faoliyati, qarorlari va ularning oqibatlarini tahlil qilish, anglash hamda o‘z-o‘zini takomillashtirishga yo‘naltirilgan murakkab psixologik jarayondir. Akmeologik yondashuv esa shaxsning eng yuqori rivojlanish cho‘qqisiga erishishga yo‘naltirilgan ilmiy-metodik konsepsiyadir. Mazkur maqolada ushbu ikki tushuncha o‘zaro uyg‘unlashgan holda ko‘rib chiqilib, o‘qituvchilik kasbining psixologik-pedagogik xususiyatlari, reflektiv kompetensiyani shakllantirish bosqichlari va metodlari, shuningdek, zamonaviy ta’lim tizimida bu jarayonni samarali yo‘lga qo‘yishning innovatsion usullari yoritiladi. Shuningdek, maqolada O‘zbekiston oliy ta’lim muassasalarida bo‘lajak o‘qituvchilarning reflektiv faoliyatini aniqlash va rivojlantirish bo‘yicha o‘tkazilgan kuzatuvlar va empirik tadqiqot natijalariga asoslangan tahlillar keltiriladi.
PRISMA Checklist - EFFECTS OF PHYSICAL ACTIVITY AND DIETARY SUPPLEMENT ON FAT FREE MASS AND BONE MASS DENSITY DURING WEIGHT LOSS - A SYSTEMATIC REVIEW AND META-ANALYSIS
Creators: name: Roth, Anja
name: Sattelmayer, Martin
name: Schorderet, Chloé
name: Gafner, Simone
name: Allet, Lara
Publisher: name: figshare
Year: 2021
Subjects: subject: 110602 Exercise Physiology
subject: FOS: Health sciences
subject: 110321 Rehabilitation and Therapy (excl. Physiotherapy)
subject: FOS: Clinical medicine
subject: 110317 Physiotherapy

description: Prisma checklist for the meta-analysis by Roth et al.
Birationality of étale morphisms via surgery
Creators: name: Nollet, Scott
name: Taylor, Laurence R.
name: Xavier, Frederico
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 14R15

description: We use a counting argument and surgery theory to show that if $D$ is a sufficiently general algebraic hypersurface in $\Bbb C^n$, then any local diffeomorphism $F:X \to \Bbb C^n$ of simply connected manifolds which is a $d$-sheeted cover away from $D$ has degree $d=1$ or $d=\infty$ (however all degrees $d > 1$ are possible if $F$ fails to be a local diffeomorphism at even a single point). In particular, any étale morphism $F:X \to \Bbb C^n$ of algebraic varieties which covers away from such a hypersurface $D$ must be birational.
description: 17 pages. Replaced to add further references and make language more consistent with the literature
Effects of Yeast-Derived Microbial Protein on Transition Dairy Cow Health and Performance
Creators: name: Mazon Correa Alves, Gustavo
Publisher: name: University of Kentucky Libraries
Year: 2019

description: The transition period for dairy cows is defined as the three weeks pre and postpartum. During the transition period, dairy cows experience a myriad of metabolic, managerial, and nutritional requirement changes. These changes lead to stress and increased susceptibility to diseases which can negatively affect lactational performance in the short and long term. However, dietary amino acid availability can have a dramatic impact on the health and performance of dairy cows around parturition. Thus, the objective of the thesis was to evaluate the effects of supplementing yeast-derived microbial protein, as an alternative protein source for dairy cows during the transition period. This was accomplished by using visual observations and precision dairy monitoring technologies to record disease, feeding behavior, and performance of dairy cows from 21 days prepartum to 150 days postpartum. Yeast-derived microbial protein was found to decrease dry matter intake but not negatively affect milk production or health of the animals. Yeast-derived microbial protein may be used as an alternative protein source for transition dairy cows as it did not negatively affect milk production or health of the animals.
description: Copyright © Gustavo Mazon Correa Alves 2019
description: Funding information: This project was supported by research funds provided by Alltech.
The diffuse interstellar band around 8620 Å II. Kinematics and distance of the DIB carrier
Creators: name: Zhao, H.
name: Schultheis, M.
name: Rojas-Arriagada, A.
name: Recio-Blanco, A.
name: de Laverny, P.
name: Kordopatis, G.
name: Surot, F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We aim to make use of the measurements from the Giraffe Inner Bulge Survey (GIBS) and the Gaia$-$ESO survey (GES) to study the kinematics and distance of the carrier of DIB$\,λ$8620, as well as other properties. We successfully detected and measured DIB$\,λ$8620 in 760 of 4117 GES spectra. Combined with the DIBs measured in GIBS spectra, we confirmed a tight relation between EW and $E(J-K_{\rm S})$ as well as $A_{\rm V}$, with similar fitting coefficients to those found by previous works. With a more accurate sample and the consideration of the solar motion, the rest-frame wavelength of DIB$\,λ$8620 was redetermined as 8620.83 Å, with a mean fit error of 0.36 Å. We studied the kinematics of the DIB carriers by tracing their median radial velocities in each field in the local standard of rest ($V_{\rm LSR}$) and into the galactocentric frame ($V_{\rm GC}$), respectively, as a function of the Galactic longitudes. Based on the median $V_{\rm LSR}$ and two Galactic rotation models, we obtained valid kinematic distances of the DIB carriers for nine GIBS and ten GES fields. We also found a linear relation between the DIB$\,λ$8620 measured in this work and the near-infrared DIB in APOGEE spectra at $1.5273\,μm$. We demonstrate that the DIB carriers can be located much closer to the observer than the background stars based on the following arguments: (i) qualitatively, the carriers occupy in the Galactic longitude$-$velocity diagram typical rotation velocities of stars in the local Galactic disk, while the background stars in the GIBS survey are mainly located in the Galactic bulge; (ii) quantitatively, all the derived kinematic distances of the DIB carriers are smaller than the median distances to background stars in each field.
description: 12 pages, 12 figures, 2 tables, accepted by A&A
Gauge Invariant Overlaps for Classical Solutions in Open String Field Theory
Creators: name: Kawano, Teruhiko
name: Kishimoto, Isao
name: Takahashi, Tomohiko
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate gauge invariant observables for Schnabl's solution with analytic method and with the level truncation approximation. We also compute them for the numerical solution initially obtained by Sen and Zwiebach in the level truncation approximation to compare with the one for Schnabl's solution. The results are consistent with the expectation that they may be gauge equivalent. We briefly discuss the gauge invariant observables and the action for a marginal solution with a nonsingular current.
description: 33 pages, 5 figures, LaTeX; v2:typos corrected, references added; v3: improved numerical analysis in section 4
Micromagnetic simulations of small arrays of submicron ferromagnetic particles
Creators: name: Dantas, Christine C.
name: de Andrade, Luiz A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the results of a set of simulations of small arrays of submicron ferromagnetic particles. The actions of dipolar and exchange interactions were qualitatively investigated by analysing the ferromagnetic resonance spectra at 9.37 GHz resulting from the magnetization response of con- nected and unconnected particles in the array as a function of the applied dc magnetic field. We find that the magnetization precession movement (at resonance) observed in individual particles in the array presents a distinctive behaviour (an amplitude mismatch) in comparison to isolated, one-particle reference simulations, a result that we attribute to the action of interparticle dipolar couplings. Exchange interactions appear to have an important role in modifying the spectra of connected particles, even through a small contact surface.
description: 24 pages, 8 figures, accepted for publication in Physical Review B
Emerging Digital Solutions, The Future of Dental Care - Travis Vu Nguyen Khanh Duy
Creators: name: Vu Nguyen Khanh Duy, Travis
Publisher: name: figshare
Year: 2021
Subjects: subject: 110502 Dental Therapeutics, Pharmacology and Toxicology
subject: FOS: Clinical medicine
subject: 110501 Dental Materials and Equipment
subject: 110599 Dentistry not elsewhere classified
subject: 110506 Orthodontics and Dentofacial Orthopaedics

description: Digital dentistry can be referred to the use of devices and technologies to incorporate computer-controlled components for carrying out dental procedures which replace mechanical tools. Innovative trends in this sector can mention the implementation of intraoral cameras into digital labs, along with digital radiography e.g. CT scans, magnetic resonance imaging, and CBCT - cone beam computed tomography.
Symmetric links and Conway sums: volume and Jones polynomial
Creators: name: Futer, David
name: Kalfagianni, Efstratia
name: Purcell, Jessica S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M27, 57M50

description: We obtain bounds on hyperbolic volume for periodic links and Conway sums of alternating tangles. For links that are Conway sums we also bound the hyperbolic volume in terms of the coefficients of the Jones polynomial.
description: 18 pages, 7 figures. Revised according to referee's comments. To appear in Mathematical Research Letters.
Multipulse phases in k-mixtures of Bose-Einstein condensates
Creators: name: Terracini, Susanna
name: Verzini, Gianmaria
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35B40, 35J50, 35Q55

description: For a competitive system of k coupled nonlinear Schroedinger equations we prove the existence, when the competition parameter is large, of positive radial solutions on R^N. We show that, when the competition parameter goes to infinity, the profile of each component separates, in many pulses, from the others. Moreover, we can prescribe the location of such pulses in terms of the oscillations of the changing-sign solutions of the scalar nonlinear Schroedinger equation. Within an Hartree-Fock approximation, this provides a theoretical indication of phase separation into many nodal domains for the k-mixtures of Bose-Einstein condensates.
description: 21 pages
On the Statistical Modeling and Analysis of Repairable Systems
Creators: name: Lindqvist, Bo Henry
Publisher: name: arXiv
Year: 2007
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: We review basic modeling approaches for failure and maintenance data from repairable systems. In particular we consider imperfect repair models, defined in terms of virtual age processes, and the trend-renewal process which extends the nonhomogeneous Poisson process and the renewal process. In the case where several systems of the same kind are observed, we show how observed covariates and unobserved heterogeneity can be included in the models. We also consider various approaches to trend testing. Modern reliability data bases usually contain information on the type of failure, the type of maintenance and so forth in addition to the failure times themselves. Basing our work on recent literature we present a framework where the observed events are modeled as marked point processes, with marks labeling the types of events. Throughout the paper the emphasis is more on modeling than on statistical inference.
description: Published at http://dx.doi.org/10.1214/088342306000000448 in the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Hull-White Volatility Calibration
Creators: name: Lee, David
Publisher: name: Zenodo
Year: 2022
Subjects: Hull-White Volatility Calibration

description: Hull-White (HW) short interest rate volatilities are calibrated via at the money European swaptions. In Black’s framework, a European swaption is at the money if the strike level is equal to the forward swap rate. In this case, the prices of a payer and a receiver swaption on the same underlying swap will be equal.
description: https://osf.io/vwpkx/wiki/home/
Measuring Bremsstrahlung Photons in 200 GeV p+p Collisions
Creators: name: Hanks, Ali
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Direct photon production is an important observable in heavy ion collisions as photons are penetrating and therefore largely insensetive to final state effects that lead to jet quenching. Measurements of the fragmentation component to prompt photon yields in p+p and Au+Au collisions will provide both an important test of pQCD predictions and of predictions for modifications of this component in heavy ion collisions. By selecting photons associated with jets on the near side using hadron-photon correlations, fragmentation photons can be measured directly.
description: 5 pages, 4 figures, poster presented at the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (QM2006)
Building and Maintaining a Solar Tachocline through Convective Dynamo Action
Creators: name: Matilsky, Loren I.
name: Toomre, Juri
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: For more than thirty years, the dynamical maintenance of the thin solar tachocline has remained one of the central outstanding problems of stellar astrophysics. Three main theories have been developed to explain the tachocline's thinness, but so far none of them has been shown to work convincingly in the extreme parameter regime of the solar interior. Here, we present a rotating, 3D, spherical-shell simulation of a combined solar-like convection zone and radiative zone that achieves a tachocline built and maintained by convective dynamo action. Because of numerical constraints, the dynamo prevents the viscous spread of the tachocline instead of the Eddington-Sweet-time-scale radiative spread believed to occur in the Sun. Nonetheless, our simulation supports the scenario of tachocline confinement via the cyclic solar dynamo, and is the first time one of the main confinement scenarios has been realized in a global, 3D, spherical-shell geometry including nonlinear fluid motions and a self-consistently generated dynamo.
description: 6 pages, 5 figures; In the 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, edited by Scott J. Wolk
Explanation of 100-fold reduction of spectral shifts for hydrogen on helium films
Creators: name: Hazzard, Kaden R. A.
name: Mueller, Erich J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We show that helium film-mediated hydrogen-hydrogen interactions account for a two orders of magnitude discrepancy between previous theory and recent experiments on cold collision shifts in spin-polarized hydrogen adsorbed on a helium film. These attractive interactions also explain the anomalous dependence of the cold collision frequency shifts on the $^3$He covering of the film. Our findings suggest that the gas will become mechanically unstable before reaching the Kosterlitz-Thouless transition unless the experiment is performed in a drastically different regime, for example with a much different helium film geometry.
description: 4+ pages, 1 figure (3 subfigures), revtex4
Cohomology and deformations of the infinite dimensional filiform Lie algebra m_2
Creators: name: Fialowski, Alice
name: Wagemann, Friedrich
Publisher: name: arXiv
Year: 2007
Subjects: subject: Representation Theory (math.RT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 17B65, 17B56, 58H15

description: Denote $\fm_2$ the infinite dimensional $\N$-graded Lie algebra defined by the basis $e_i$ for $i\geq 1$ and by relations $[e_1,e_i]=e_{i+1}$ for all $i\geq 2$, $[e_2,e_j]=e_{j+2}$ for all $j\geq 3$. We compute in this article the bracket structure on $H^1(\fm_2,\fm_2)$, $H^2(\fm_2,\fm_2)$ and in relation to this, we establish that there are only finitely many true deformations of $\fm_2$ in each weight by constructing them explicitely. It turns out that in weight 0 one gets as non-trivial deformation only one formal non-converging deformation.
description: 17 pages
The topological structure of SU(2) gluodynamics at T > 0 : an analysis using the Symanzik action and Neuberger overlap fermions
Creators: name: Bornyakov, V. G.
name: Luschevskaya, E. V.
name: Morozov, S. M.
name: Polikarpov, M. I.
name: Ilgenfritz, E. -M.
name: Müller-Preussker, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study SU(2) gluodynamics at finite temperature on both sides of the deconfining phase transition. We create the lattice ensembles using the tree-level tadpole-improved Symanzik action. The Neuberger overlap Dirac operator is used to determine the following three aspects of vacuum structure: (i) The topological susceptibility is evaluated at various temperatures across the phase transition, (ii) the overlap fermion spectral density is determined and found to depend on the Polyakov loop above the phase transition and (iii) the corresponding localization properties of low-lying eigenmodes are investigated. Finally, we compare with zero temperature results.
description: 20 pages, 21 figures, one new figure, two overloaded figures split in two, minor clarifying changes throughout the text, final version accepted by Physical Review D
SN Shock Evolution in the Circumstellar Medium surrounding SN 1987A
Creators: name: Dwarkadas, Vikram V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the structure of the circumstellar medium surrounding SN 1987A in the equatorial plane. Furthermore, we study the evolution of the SN shock within this medium during the first 25 years, and the resulting hard X-ray and radio emission from the remnant.
description: 5 pages, 3 Figures. To be published in the proceedings of the conference on "Supernova 1987A: 20 Years After: Supernovae and Gamma-Ray Bursters" AIP, New York, eds. S. Immler, K.W. Weiler, and R. McCray
Non-Abelian Supercurrents and de Sitter Ground State in Electroweak Theory
Creators: name: Chernodub, M. N.
name: Faddeev, Ludvig
name: Niemi, Antti J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that gauge symmetry breaking in the Weinberg-Salam model can be implemented by a mere change of variables and without any explicit gauge fixing. The change of variables entails the concept of supercurrent which has been widely employed in the study of superconductivity. It also introduces a separation between the isospin and the hypercharge, suggesting that our new variables describe a strongly coupled regime of the electroweak theory. We discuss the description of various embedded topological defects in terms of these variables. We also propose that in terms of our variables the Weinberg-Salam model can be interpreted in terms of a gravity theory with the modulus of Higgs field as dilaton and the de Sitter space as the ground state.
description: 13 pages, no figures, JHEP style, published version
การพัฒนาบทเรียนคอมพิวเตอร์ช่วยสอนเรื่อง ปรากฏการณ์ของโลกและเทคโนโลยีอวกาศกลุ่มสาระการเรียนรู้วิทยาศาสตร์ สำหรับนักเรียนชั้นประถมศึกษาปีที่ 6
Creators: name: ศุภรา แสงแก้ว
name: สุรทิน นาราภิรมย์
name: เนตรชนก จันทร์สว่าง
Publisher: name: มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2011
Subjects: บทเรียนคอมพิวเตอร์ช่วยสอน, ประสิทธิภาพของบทเรียนคอมพิวเตอร์ช่วยสอน, ดัชนีประสิทธิผลของบทเรียนคอมพิวเตอร์ช่วยสอน,

description: 1, 5, วารสารมหาวิทยาลัยราชภัฏมหาสารคามมนุษยศาสตร์และสังคมศาสตร์
GeoVectors: A Linked Open Corpus of OpenStreetMap Embeddings on World Scale
Creators: name: Tempelmeier, Nicolas
name: Gottschalk, Simon
name: Demidova, Elena
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: OpenStreetMap (OSM) is currently the richest publicly available information source on geographic entities (e.g., buildings and roads) worldwide. However, using OSM entities in machine learning models and other applications is challenging due to the large scale of OSM, the extreme heterogeneity of entity annotations, and a lack of a well-defined ontology to describe entity semantics and properties. This paper presents GeoVectors - a unique, comprehensive world-scale linked open corpus of OSM entity embeddings covering the entire OSM dataset and providing latent representations of over 980 million geographic entities in 180 countries. The GeoVectors corpus captures semantic and geographic dimensions of OSM entities and makes these entities directly accessible to machine learning algorithms and semantic applications. We create a semantic description of the GeoVectors corpus, including identity links to the Wikidata and DBpedia knowledge graphs to supply context information. Furthermore, we provide a SPARQL endpoint - a semantic interface that offers direct access to the semantic and latent representations of geographic entities in OSM.
The complete impurity scattering formalism in graphene
Creators: name: Bena, Cristina
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present the complete formalism that describes scattering in graphene at low-energies. We begin by analyzing the real-space free Green's function matrix, and its analytical expansions at low-energy, carefully incorporating the discrete lattice structure, and arbitrary forms of the atomic-orbital wave function. We then compute the real-space Green's function in the presence of an impurity. We express our results both in 2X2 and 4X4 forms (for the two sublattices and the two inequivalent valleys of the first Brillouin zone). We compare this with the 4X4 formalism proposed in cond-mat/0608228 and cond-mat/0702019, and show that the latter is incomplete. We describe how it can be adapted to accurately take into account the effects of inter-valley scattering on spatially-varying quantities such as the local density of states.
description: 11 pages, 1 figure
Ab initio calculation of the contact operator contribution in the standard mechanism for neutrinoless double beta decay
Creators: name: Wirth, R.
name: Yao, J. M.
name: Hergert, H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Starting from chiral nuclear interactions, we evaluate the contribution of the leading-order contact transition operator to the nuclear matrix element (NME) of neutrinoless double-beta decay, assuming a light Majorana neutrino-exchange mechanism. The corresponding low-energy constant (LEC) is determined by fitting the transition amplitude of the $nn\to ppe^-e^-$ process to a recently proposed synthetic datum. We examine the dependence of the amplitude on similarity renormalization group (SRG) scale and chiral expansion order of the nuclear interaction, finding that both dependences can be compensated to a large extent by readjusting the LEC. We evaluate the contribution of both the leading-order contact operator and standard long-range operator to the neutrinoless double-beta decays in the light nuclei $^{6,8}$He and the candidate nucleus $^{48}$Ca. Our results provide the first clear demonstration that the contact term enhances the NME by 43(7)% in $^{48}$Ca, where the uncertainty is propagated from the synthetic datum.
description: 6 pages, 3 figures
Colors Of Graphite On Silicon Dioxide
Creators: name: Roddaro, S.
name: Pingue, P.
name: Piazza, V.
name: Pellegrini, V.
name: Beltram, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Monoatomic layers of graphite can be electrically contacted and used as building blocks for new promising devices. These experiment are today possible thanks to the fact that very thin graphite can be identified on a dielectric substrate using a simple optical microscope. We investigate the mechanism behind the strong visibility of graphite and we discuss the importance of the substrate and of the microcope objective used for the imaging.
description: 4 pages, 4 figures, abstract reviewed&accepted for presentation at EP2DS-17
Magnification and evolution biases in large-scale structure surveys
Creators: name: Maartens, Roy
name: Fonseca, José
name: Camera, Stefano
name: Jolicoeur, Sheean
name: Viljoen, Jan-Albert
name: Clarkson, Chris
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Measurements of galaxy clustering in upcoming surveys such as those planned for the Euclid and Roman satellites, and the SKA Observatory, will be sensitive to distortions from lensing magnification and Doppler effects, beyond the standard redshift-space distortions. The amplitude of these contributions depends sensitively on magnification bias and evolution bias in the galaxy number density. Magnification bias quantifies the change in the observed number of galaxies gained or lost by lensing magnification, while evolution bias quantifies the physical change in the galaxy number density relative to the conserved case. These biases are given by derivatives of the number density, and consequently are very sensitive to the form of the luminosity function. We give a careful derivation of the magnification and evolution biases, clarifying a number of results in the literature. We then examine the biases for a variety of surveys, encompassing galaxy surveys and line intensity mapping at radio and optical/near-infrared wavelengths.
description: Typo corrected in equation (A.10)
The Evolution of Late-time Optical Emission from SN 1986J
Creators: name: Milisavljevic, D.
name: Fesen, R.
name: Leibundgut, B.
name: Kirshner, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present late-time optical images and spectra of the Type IIn supernova SN 1986J. HST ACS/WFC images obtained in February 2003 show it to be still relatively bright with m(F606W) = 21.4 and m(F814W) = 20.0 mag. Compared against December 1994 HST WFPC2 images, SN 1986J shows a decline of only <1 mag in brightness over eight years. Ground-based spectra taken in 1989, 1991 and 2007 show a 50% decline in Halpha emission between 1989-1991 and an order of magnitude drop between 1991-2007, along with the disappearance of He I line emissions during the period 1991-2007. The object's [O I] 6300, 6364, [O II] 7319, 7330 and [O III] 4959, 5007 emission lines show two prominent peaks near -1000 km/s and -3500 km/s, with the more blueshifted component declining significantly in strength between 1991 and 2007. The observed spectral evolution suggests two different origins for SN 1986J's late-time optical emission: dense, shock-heated circumstellar material which gave rise to the initially bright Halpha, He I, and [N II] 5755 lines, and reverse-shock heated O-rich ejecta on the facing expanding hemisphere dominated by two large clumps generating two blueshifted emission peaks of [O I], [O II], and [O III] lines.
description: 4 pages, 3 figures. Submitted to the Astrophysical Journal (Letters)
Five Opportunities To Have Imact On The World
Creators: name: Dorbayani, Mosi
Publisher: name: University of Salford
Year: 2021
Subjects: subject: 150205 Investment and Risk Management
subject: FOS: Economics and business
subject: 160805 Social Change
subject: FOS: Sociology
subject: 160703 Social Program Evaluation
subject: 160512 Social Policy
subject: FOS: Political science
subject: 140104 Microeconomic Theory
subject: Economics
subject: 140202 Economic Development and Growth
subject: 160505 Economic Development Policy
subject: 140213 Public Economics- Public Choice

description: Seasoned entrepreneurs know that opportunities can be discovered and/or created. If you desire to have impact on the world, then in nutshell, the following five areas can be sought after....
Parametrizing fluids in canonical quantum gravity
Creators: name: Montani, Giovanni
name: Zonetti, Simone
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The problem of time is an unsolved issue of canonical General Relativity. A possible solution is the Brown-Kuchar mechanism which couples matter to the gravitational field and recovers a physical, i.e. non vanishing, observable Hamiltonian functional by manipulating the set of constraints. Two cases are analyzed. A generalized scalar fluid model provides an evolutionary picture, but only in a singular case. The Schutz' model provides an interesting singularity free result: the entropy per baryon enters the definition of the physical Hamiltonian. Moreover in the co-moving frame one is able to identify the time variable tau with the logarithm of entropy.
description: 5 pages, no figures. Proceeding of the II Stueckelberg Workshop, Pescara, Sept. 2007
Itinerant and localized magnetism on the triangular lattice: sodium rich phases of Na$_x$CoO$_2$
Creators: name: Gao, Meng
name: Zhou, Sen
name: Wang, Ziqiang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the interplay between correlation, itinerant ferromagnetism and local moment formation on the electron doped triangular lattice of sodium cobaltates Na$_x$CoO$_2$. We find that strong correlation renormalizes the Stoner criterion and stabilizes the paramagnetic state for $xx_c$, ferromagnetic (FM) order emerges. The enhanced Na dopant potential fluctuations play a crucial role in the sodium rich phases and lead to an inhomogeneous FM state, exhibiting nonmagnetic Co$^{3+}$ patches, antiferromagnetic (AF) correlated regions, and FM clusters with AF domains. Hole doping the band insulator at x=1 leads to the formation of local moments near the Na vacancies and AF correlated magnetic clusters. We explain recent observations by neutron, $μ$SR, and NMR experiments on the evolution of the magnetic properties in the sodium rich phases.
description: revtex4 file, 5 pages, 3 figures, published version
Security Constrained Unit Commitment for Electricity Market: Modeling, Solution Methodology and Future Challenges (Slides)
Creators: Yonghong Chen
Publisher: name: IEEE
Year: 2022

This webinar summarizes the technical activities of the IEEE Task Force on Solving Large Scale Optimization Problems in Electricity Market and Power System Applications. This Task Force was established by the IEEE Technology and Innovation Subcommittee to first review the state-of-the-art of the security-constrained unit commitment (SCUC) business model, its mathematical formulation, and solution techniques in solving electricity market clearing problems. The Task Force then investigated the emerging challenges of future market clearing problems and presented efforts in building benchmark mathematical and business models.
This webinar summarizes the technical activities of the IEEE Task Force on Solving Large Scale Optimization Problems in Electricity Market and Power System Applications. This Task Force was established by the IEEE Technology and Innovation Subcommittee to first review the state-of-the-art of the security-constrained unit commitment (SCUC) business model, its mathematical formulation, and solution techniques in solving electricity market clearing problems. The Task Force then investigated the emerging challenges of future market clearing problems and presented efforts in building benchmark mathematical and business models.
Entangled maximal mixings in U_PMNS=U_l^dagger U_nu, and a connection to complex mass textures
Creators: name: Niehage, Svenja
name: Winter, Walter
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss two different configurations of U_PMNS=U_l^dagger U_nu with maximal mixings in both U_l and U_nu. The non-maximal mixing angles are assumed to be small, which means that they can be expanded in. Since we are particularly interested in the implications for CP violation, we fully take into account complex phases. We demonstrate that one possibility leads to intrinsically large theta_13 and strong deviations from maximal mixings. The other possibility is generically close to tri-bimaximal mixing, and allows for large CP violation. We demonstrate how the determination of the theta_23 octant and the precision measurement of delta_CP could discriminate among different qualitative sub-cases. In order to constrain the unphysical and observable phases even further, we relate our configurations to complex mass matrix textures. In particular, we focus on phase patterns which could be generated by powers of a single complex quantity eta=theta_C exp(i Phi), which can be motivated by Froggatt-Nielsen-like models. For example, it turns out that in all of the discussed cases, one of the Majorana phases is proportional to Phi to leading order. In the entire study, we encounter three different classes of sum rules, which we systematically classify.
description: 27 pages, 6 tables, 1 figure. Shortened version to appear in Phys. Rev. D
Comment on: "Stokes' first problem for heated flat plate with Atangana--Baleanu fractional derivative" [Chaos Solitons Fractals 117 (2018) 68]
Creators: name: Christov, Ivan C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In the sense of distributions, the derivative of the Heaviside unit step function $H(t)$ is a generalized Dirac-$δ$ distribution. If the velocity $V(t)$ of a flat plate is impulsive, as $V(t)=H(t)$ (i.e., it is suddenly set into motion with unit velocity at $t=0^+$), then its acceleration is $V'(t)=δ(t)$. The Dirac-$δ$ distribution has no point values. However, when the Dirac-$δ$ is the forcing term of an ODE (in $t$), it contributes to the solution. The recently published paper [Chaos Solitons Fractals 117 (2018) 68] incorrectly treats the Dirac-$δ$ function as being identically 0. This Comment analyzes the source of this error, and provides guidance on how to correct it (based on the established literature). The mathematical error identified is in addition to some issues about rheological models with fractional derivatives, which are also noted. That is to say, whether or not an "Atangana--Baleanu fractional derivative" is used in [Chaos Solitons Fractals 117 (2018) 68], the solution to Stokes' first problem provided therein is not correct.
description: 2 pages, peer-reviewed Letter to the Editor of Chaos, Solitons & Fractals