cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stein ICP for Uncertainty Estimation in Point Cloud Matching
Creators: name: Maken, Fahira Afzal
name: Ramos, Fabio
name: Ott, Lionel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Quantification of uncertainty in point cloud matching is critical in many tasks such as pose estimation, sensor fusion, and grasping. Iterative closest point (ICP) is a commonly used pose estimation algorithm which provides a point estimate of the transformation between two point clouds. There are many sources of uncertainty in this process that may arise due to sensor noise, ambiguous environment, and occlusion. However, for safety critical problems such as autonomous driving, a point estimate of the pose transformation is not sufficient as it does not provide information about the multiple solutions. Current probabilistic ICP methods usually do not capture all sources of uncertainty and may provide unreliable transformation estimates which can have a detrimental effect in state estimation or decision making tasks that use this information. In this work we propose a new algorithm to align two point clouds that can precisely estimate the uncertainty of ICP's transformation parameters. We develop a Stein variational inference framework with gradient based optimization of ICP's cost function. The method provides a non-parametric estimate of the transformation, can model complex multi-modal distributions, and can be effectively parallelized on a GPU. Experiments using 3D kinect data as well as sparse indoor/outdoor LiDAR data show that our method is capable of efficiently producing accurate pose uncertainty estimates.
description: 8 pages, 7 figures, Robotics and Automation Letters
Identification of the Microlens in Event MACHO-LMC-20
Creators: name: Kallivayalil, Nitya
name: Patten, Brian M.
name: Marengo, Massimo
name: Alcock, Charles
name: Werner, Michael W.
name: Fazio, Giovanni G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the identification of the lens responsible for microlensing event MACHO-LMC-20. As part of a \textit{Spitzer}/IRAC program conducting mid-infrared follow-up of the MACHO Large Magellanic Cloud microlensing fields, we discovered a significant flux excess at the position of the source star for this event. These data, in combination with high resolution near-infrared \textit{Magellan}/PANIC data has allowed us to classify the lens as an early M dwarf in the thick disk of the Milky Way, at a distance of $\sim 2$ kpc. This is only the second microlens to have been identified, the first also being a M dwarf star in the disk. Together, these two events are still consistent with the expected frequency of nearby stars in the Milky Way thin and thick disks acting as lenses.
description: 6 pages, 4 figures, submitted to ApJ Letters
title: Analysis of the piezo- and pyroelectric response of PVDF foils as fast particle detectors in pulsed supersonic jets
Creators: name: Saftien, Paul
name: Lange, Karsten
name: Christen, Wolfgang
Publisher: name: Humboldt-Universität zu Berlin
Year: 2024
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften

description: We report the design and performance of a new, rugged, general-purpose particle detector consisting of a stretched foil of polyvinylidene difluoride. Several detectors have been built and evaluated for applications in pulsed supersonic jet experiments where, e.g. , particle density shall be measured with high time resolution. The working principle is that a directed bunch of particles, moving in vacuum, collides with the sensitive detector area and generates an electric charge. This charge generation is due to both the piezo- and the pyroelectric effect and results in a very fast detector response. In our detailed analysis of the detected signal, the piezoelectric contribution is defined by the constitutive equations of piezoelectricity, which are used in combination with the concept of a driven damped circular membrane allowing to obtain an analytic solution. The pyroelectric contribution is described via the exchanged energy between the impinging particle pulse and the detector foil. Because both the piezo- and the pyroelectric effects can be exploited, additional information about the particle impact such as the coefficient of energy accommodation or the coefficient of restitution can be determined experimentally.
Determination of Nucleon Form factors from Baryonic B Decays
Creators: name: Geng, C. Q.
name: Hsiao, Y. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is the first time that the study of three-body baryonic B decays offers an independent determination of the nucleon form factors for the time-like four momentum transfer $(t>0)$ region, such as $G^{p,n}_M(t)$ of vector currents and those of axial ones. Explicitly, from the data of $\bar B^0\to n\bar p D^{*+}$ and $Λ\bar pπ^+$ we find a constant ratio of $G^n_M(t)/G^p_M(t)=-1.3\pm0.4$, which supports the FENICE experimental result. The vector and axial-vector form factors of $p\bar n$, $p\bar p$ and $n\bar n$ pairs due to weak currents are also presented, which can be tested in future experiments.
description: 10 pages, 3 figures, final version to be published in PRD
Orbital embedding and topology of one-dimensional two-band insulators
Creators: name: Fuchs, J. -N.
name: Piéchon, F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The topological invariants of band insulators are usually assumed to depend only on the connectivity between orbitals and not on their intra-cell position (orbital embedding), which is a separate piece of information in the tight-binding description. For example, in two dimensions, the orbital embedding is known to change the Berry curvature but not the Chern number. Here, we consider one-dimensional inversion-symmetric insulators classified by a $\mathbb{Z}_2$ topological invariant $\vartheta=0$ or $π$, related to the Zak phase, and show that $\vartheta$ crucially depends on orbital embedding. We study three two-band models with bond, site or mixed inversion: the Su-Schrieffer-Heeger model (SSH), the charge density wave model (CDW) and the Shockley model. The SSH (resp. CDW) model is found to have a unique phase with $\vartheta=0$ (resp. $π$). However, the Shockley model features a topological phase transition between $\vartheta=0$ and $π$. The key difference is whether the two orbitals per unit cell are at the same or different positions.
description: published version, 10 pages, 7 figures
Entanglement, Haag-duality and type properties of infinite quantum spin chains
Creators: name: Keyl, M.
name: Matsui, T.
name: Schlingemann, D.
name: Werner, R. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 81P68; 82B20; 47L90

description: We consider an infinite spin chain as a bipartite system consisting of the left and right half-chain and analyze entanglement properties of pure states with respect to this splitting. In this context we show that the amount of entanglement contained in a given state is deeply related to the von Neumann type of the observable algebras associated to the half-chains. Only the type I case belongs to the usual entanglement theory which deals with density operators on tensor product Hilbert spaces, and only in this situation separable normal states exist. In all other cases the corresponding state is infinitely entangled in the sense that one copy of the system in such a state is sufficient to distill an infinite amount of maximally entangled qubit pairs. We apply this results to the critical XY model and show that its unique ground state provides a particular example for this type of entanglement.
description: LaTeX2e, 34 pages, 1 figure (pstricks)
Enhanced phase sensitivity and soliton formation in an integrated BEC interferometer
Creators: name: Negretti, Antonio
name: Henkel, Carsten
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the dynamics of Bose-Einstein condensates in time-dependent microtraps for the purpose of understanding the influence of the mean field interaction on the performance of interferometers. We identify conditions where the non-linearity due to atom interactions increases the sensitivity of interferometers to a phase shift. This feature is connected with the adiabatic generation of a dark soliton. We analyze the robustness of this phenomenon with respect to thermal fluctuations, due to excited near fields in an electromagnetic surface trap.
description: 6 pages, 3 figures, Iop LaTex2e
Mass-dependent Color Evolution of Field Galaxies Back to z~3 Over the Wide Range of Stellar Mass
Creators: name: Kajisawa, Masaru
name: Yamada, Toru
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use deep multi-band optical and near-infrared data for four general fields, GOODS-South, HDF North/South, and IRAC UDF in GOODS-North to investigate the evolution of the observed rest-frame U-V color of field galaxies as a function of the stellar mass. In these four fields, the U-V color distributions of the galaxies at each mass and redshift interval are very similar. At 0.3 3x10^10M_solar) evolves more strongly at a high redshift. Such mass-dependent color distribution and its evolution indicate that galaxies with a larger stellar mass appear to have shorter star-formation timescales, and on an average, they form the larger fraction of their stars in the earlier epoch.
description: 7 pages, 3 color figures, accepted for publication in ApJ
Codimension one distributions of degree 2 on the three-dimensional projective space
Creators: name: Galeano, Hugo
name: Jardim, Marcos
name: Muniz, Alan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 58A17, 14D20, 14J60, 14D22, 14F06, 13D02

description: We establish a full classification of degree $2$ codimension one distributions on $\mathbb{P}^3$ according to invariants of their tangent sheaves.
description: 33 pages. Final version. To appear in Journal of Pure and Applied Algebra
The Origin and Evolution of the Mass-Metallicity Relationship for Galaxies: Results from Cosmological N-Body Simulations
Creators: name: Brooks, A. M.
name: Governato, F.
name: Booth, C. M.
name: Willman, B.
name: Gardner, J. P.
name: Wadsley, J.
name: Stinson, G.
name: Quinn, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the origin and evolution of the mass-metallicity relationship (MZR, M-Z) for galaxies using high resolution cosmological SPH + N-Body simulations that include a physically motivated description of supernovae feedback and subsequent metal enrichment. We discriminate between two sources that may contribute to the origin of the MZR: 1) metal and baryon loss due to gas outflow, or 2) inefficient star formation at the lowest galaxy masses. Our simulated galaxies reproduce the observed MZR in shape and normalization both at z=0 and z=2. We find that baryon loss occurs due to UV heating before star formation turns on in galaxies with M_baryon < 10^8 M_sun, but that some gas loss due to supernovae induced winds is required to subsequently reproduce the low effective chemical yield observed in low mass galaxies. Despite this, we show that low star formation efficiencies, regulated by supernovae feedback, are primarily responsible for the lower metallicities of low mass galaxies and the overall M-Z trend. We find that the shape of the MZR is relatively constant with redshift, but that its normalization increases with time. Simulations with no energy feedback from supernovae overproduce metals at low galaxy masses by rapidly transforming a large fraction of their gas into stars. Despite the fact that our low mass galaxies have lost a majority of their baryons, they are still the most gas rich objects in our simulations due to their low star formation efficiencies.
description: 3 figures. Accepted for ApJL, in press
Supernova neutrino signals based on long-term axisymmetric simulations
Creators: name: Nagakura, Hiroki
name: Burrows, Adam
name: Vartanyan, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study theoretical neutrino signals from core-collapse supernova (CCSN) computed using axisymmetric CCSN simulations that cover the post-bounce phase up to $\sim 4$~s. We provide basic quantities of the neutrino signals such as event rates, energy spectra, and cumulative number of events at some terrestrial neutrino detectors, and then discuss some new features in the late phase that emerge in our models. Contrary to popular belief, neutrino emissions in the late phase are not always steady, but rather have temporal fluctuations, the vigor of which hinges on the CCSN model and neutrino flavor. We find that such temporal variations are not primarily driven by proto-neutron star (PNS) convection, but by fallback accretion in exploding models. We assess the detectability of these temporal variations, and find that IceCube is the most promising detector with which to resolve them. We also update fitting formulae first proposed in our previous paper for which the total neutrino energy (TONE) emitted at the CCSN source is estimated from the cumulative number of events in each detector. This will be a powerful technique with which to analyze real observations, particularly for low-statistics data.
description: Matching the publish version
Classification of supersymmetric backgrounds of string theory
Creators: name: Gran, U.
name: Gutowski, J.
name: Papadopoulos, G.
name: Roest, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the recent progress made towards the classification of supersymmetric solutions in ten and eleven dimensions with emphasis on those of IIB supergravity. In particular, the spinorial geometry method is outlined and adapted to nearly maximally supersymmetric backgrounds. We then demonstrate its effectiveness by classifying the maximally supersymmetric IIB G-backgrounds and by showing that N=31 IIB solutions do not exist.
description: 8 pages, contribution to the proceedings of the RTN project `Constituents, Fundamental Forces and Symmetries of the Universe' conference in Napoli, October 9 - 13, 2006
General Rules for the Impact of Energetic Disorder and Mobility on Nongeminate Recombination in Phase-Separated Organic Solar Cells
Creators: name: Zuo, Guangzheng
name: Shoaee, Safa
name: Kemerink, Martijn
name: Neher, Dieter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: State of the art organic solar cells exhibit power conversion efficiencies of 18 % and above. These devices benefit from the suppression of free charge recombination with regard to the Langevin-limit of charge encounter in a homogeneous medium. It has been recognized that the main cause of suppressed free charge recombination is the reformation and resplitting of charge transfer states at the interface between donor and acceptor domains. Here, we use kinetic Monte Carlo simulations to understand the interplay between free charge motion and recombination in an energetically-disordered phase-separated donor-acceptor blend. We identify conditions for encounter-dominated and resplitting-dominated recombination. In the former regime, recombination is proportional to mobility for all parameters tested and only slightly reduced with respect to the Langevin limit. In contrast, mobility is not the decisive parameter determining the non-geminate recombination coefficient k_2in the latter case where k_2 is a sole function of the morphology, CT and CS energetics and CT states decay properties. Our simulations also show that free charge encounter in the phase-separated disordered blend is determined by the average mobility of all carriers, while CT reformation and resplitting involves mostly states near the transport energy. Therefore, charge encounter is more affected by increased disorder than the resplitting of the CT state. As a consequence, for a given mobility, larger energetic disorder in combination with a higher hopping rate is preferred. These findings have important implications for the understanding of suppressed recombination in solar cells with non-fullerene acceptors which are known to exhibit lower energetic disorder than fullerenes.
description: Main text: 35 pages, 6 figures, 66 references, Supporting information: 9 pages, 9 figures
Designing a professional learning community to promote campus internationalization through the higher education classroom
Creators: name: Nikoui-Tehrani, Maz
Publisher: name: No Publisher Supplied
Year: 2021

description: Internationalization has become a buzzword in many US higher education circles. Despite the variations in how institutions define this concept, the common denominator seen in all definitions speaks to a simple principle: the inclusion of international perspectives to educate and promote a global sense of being for students. To limit the scope of this vast concept, this study looks at internationalization as the attempt to successfully integrate international students on US campuses to have valuable academic and life experiences. To fulfill this feat, university leaders have utilized a range of administrative designs and programmatic add-ons to ensure a smooth transition for international students coming to the US; however, what seems to most often be a missing from the discussion is the role that the classroom plays in assisting these successful integration and promotion efforts for international students. This study inquires faculty perceptions of the internationalization process occurring at a US university and further looks into the preparedness of faculty as they are at the frontline of encounter for most international students; yet ironically, faculty are most often left out of this component of the internationalization equation. As a result of the inquiry, the study sheds light on how faculty are often deprived of the skills, trainings, or awareness required to promote an inclusive environment to create impactful opportunities that can assist the internationalization efforts being espoused by university leadership. To bridge this gap, the study proposes a professional learning community model that focuses on campus internationalization and puts faculty and the classroom at the forefront of internationalization efforts and discussions.
Flavored axion in the UV-complete Froggatt-Nielsen models
Creators: name: de la Vega, Leon M. G.
name: Nath, Newton
name: Nellen, Stefan
name: Peinado, Eduardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose UV-completions of Froggatt-Nielsen-Peccei-Quinn models of fermion masses and mixings with flavored axions, by incorporating heavy fields. Here, the $U(1)$ Froggatt-Nielsen symmetry is identified with the Peccei-Quinn symmetry to solve the strong CP problem along with the mass hierarchies of the Standard Model fermions. We take into account leading order contributions to the fermion mass matrices giving rise to Nearest-Neighbour-Interaction structure in the quark sector and $A_2$ texture in the neutrino sector. A comprehensive numerical analysis has been performed for the fermion mass matrices. Subsequently, we investigate the resulting axion flavor violating couplings and the axion-photon coupling arising from the model.
description: 24 pages, 4 figures, 5 tables. Version to appear in the EPJC
On the chaotic behavior of a generalized logistic $p$-adic dynamical system
Creators: name: Mukhamedov, Farrukh
name: Mendes, José F. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 37E99, 37B25, 54H20, 12J12

description: In the paper we describe basin of attraction $p$-adic dynamical system $G(x)=(ax)^2(x+1)$. Moreover, we also describe the Siegel discs of the system, since the structure of the orbits of the system is related to the geometry of the $p$-adic Siegel discs.
description: 19 pages. J. Differential Equations (2007) (to appear)
Creative services in Vancouver : a case study of Yaletown and Victory Square
Creators: name: Brail, Shauna Gillian
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this thesis is to examine the role of creative service firms in the functioning of the economic, social and physical fabric of Vancouver’s urban core and specifically in the spatially distinctive design areas of Yaletown and Victory Square. The creative service sector is comprised of businesses that provide design services to both the public and private sectors. Creative services are relatively understudied. This thesis thus provides fresh insight regarding the creative service sector as a subsector of producer services (the fastest growing sector of employment in urban areas) and specifically discusses their role within the City of Vancouver. To this end, a literature review of related urban planning and geography theory is combined with a review of Vancouver’s recent development as a centre catering to advanced services, and an empirical study of creative services in downtown Vancouver. The issues addressed include urban economic restructuring, the role of producer services in urban economies, the role of creative services as a type of producer service, the land use and location patterns illustrative of creative services, and the importance of land use planning that successfully integrates a diversity of urban functions, including creative services, within the urban core. The potential impacts of major downtown land redevelopment on design neighbourhoods in Vancouver is also discussed. Research methodology included mapwork showing the locations of creative service firms within Vancouver’s central area and in-depth interviewing and detailed analysis of twenty six Architectural, Graphic and Interior Design firms in the neighbourhoods of Yaletown and Victory Square. Yaletown as an established design district and Victory Square as an emerging design district, provided the basis for a comparative neighbourhood level study. The findings support the hypothesis that creative services are integral to the City of Vancouver in the sense that they help support the downtown corporate complex. In addition, they are instrumental in the upgrading of dilapidated buildings and neighbourhoods. Firms are characterized by their tendency to agglomerate in inner city neighbourhoods, relative youth, and small size. Linkages with both corporate and creative services suppliers are highly localized in the downtown, while client locations tend to be more dispersed. Understanding the role of creative services as a subsector of producer services, as a support service to business services in downtown Vancouver, and as generators of urban economic growth; in addition to the importance of inner city neighbourhoods as locations for creative service firms, are important factors to consider during the current phase of land use restructuring in downtown Vancouver.
The Impact of Baryonic Cooling on Giant Arc Abundances
Creators: name: Rozo, Eduardo
name: Nagai, Daisuke
name: Keeton, Charles
name: Kravtsov, Andrey
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using ray tracing for simple analytic profiles, we demonstrate that the lensing cross section for producing giant arcs has distinct contributions due to arcs formed through image distortion only, and arcs form from the merging of two or three images. We investigate the dependence of each of these contributions on halo ellipticity and on the slope of the density profile, and demonstrate that at fixed Einstein radius, the lensing cross section increases as the halo profile becomes steeper. We then compare simulations with and without baryonic cooling of the same cluster for a sample of six clusters, and demonstrate that cooling can increase the overall abundance of giant arcs by factors of a few. The net boost to the lensing probability for individual clusters is mass dependent, and can lower the effective low mass limit of lensing clusters. This last effect can potentially increase the number of lensing clusters by an extra 50%. While the magnitude of these effects may be overestimated due to the well known overcooling problem in simulations, it is evident that baryonic cooling has a non-negligible impact on the expected abundance of giant arcs, and hence cosmological constraints from giant arc abundances may be subject to large systematic errors.
description: ApJ Submitted
Mixed Gauge and Anomaly Mediation From New Physics at 10 TeV
Creators: name: Hsieh, Ken
name: Luty, Markus A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the context of anomaly-mediated supersymmetry breaking, it is natural for vectorlike fields and singlets to have supersymmetry breaking masses of order 10 TeV, and therefore act as messengers of supersymmetry breaking. We show that this can give rise to phenomenologically viable spectra compatible with perturbative gauge coupling unification. The minimal model interpolates continuously between pure anomaly mediation and gauge mediation with a messenger scale of order 10 TeV. It is also possible to have non-minimal models with more degenerate specta, with some squarks lighter than sleptons. These models reduce to the MSSM at low energies and incorporate a natural solution of the mu problem. The minimal model has four continuous parameters and one discrete parameter (the number of messengers). The LEP Higgs mass bound can be satisfied in the minimal model by tuning parameters at the GUT scale to one part in 50.
description: 17 pages, 4 figures
Synthesis, crystal structure, computational chemistry studies and Hirshfeld surface analysis of two Schiff bases, (E)-2-[(4-bromo-2-methylphenylimino)methyl]-4-methylphenol and (E)-2-[(4-bromo-2-methylphenylimino)methyl]-6-methylphenol
Creators: name: Demircioğlu, Zeynep
name: Kaştaş, Çiğdem Albayrak
name: Kaştaş, Gökhan
name: Ersanlı, Cem Cüneyt
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: In this study, two Schiff bases, (E)-2-[(4-bromo-2-methylphenylimino)methyl]-4-methylphenol (I) and (E)-2-[(4-bromo-2-methylphenylimino)methyl]-6-methylphenol (II) are synthesized and characterized by XRD and UV–Vis spectroscopy. The presence of various intermolecular interactions and 2 D-fingerprint regions are well supported by the Hirshfeld surface analysis. Also experimental optical energy band and gap studies are discussed. All theoretical computations (NBO, FMOs, MEP, NP, MP, FF) were calculated by Density Functional Theory (DFT) at B3LYP level by using 6-311 G(d,p) basis set. The interactions between the title molecules and DNA bases were investigated by using the ECT (electrophilicity-based charge transfer) method.
Plateau transitions of spin pump and bulk-edge correspondence
Creators: name: Kuno, Yoshihito
name: Hatsugai, Yasuhiro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Sequential plateau transitions of quantum spin chains ($S$=1,3/2,2 and 3) are demonstrated by a spin pump using dimerization and staggered magnetic field as synthetic dimensions. The bulk is characterized by the Chern number associated with the boundary twist and the pump protocol as a time. It counts the number of critical points in the loop that is specified by the $Z_2$ Berry phases. With open boundary condition, discontinuity of the spin weighted center of mass due to emergent effective edge spins also characterizes the pump as the bulk edge correspondence. It requires extra level crossings in the pump as a super-selection rule that is consistent with the Valence Bond Solid (VBS) picture.
description: 11 pages, 6 figures
DESIGN FOR 4D PRINTING OF SHAPE MEMORY POLYMERS IN UAV APPLICATIONS
Creators: name: Ebeid, Mary
Publisher: name: Zenodo
Year: 2021
Subjects: unmanned aerial vehicle
shape memory polymers
4D printing

description: The use of smart materials is vital in achieving the desired morphing characteristics while improving the efficiency of Unmanned Ariel Vehicles (UAV). The smart material combines the structure and actuator into a single element without discrete moving parts, thereby minimizing the weight and mechanical complexity of the UAV. Smart material facilitates the realization of smart actuation concepts that help in potentially improving system reliability and reducing the risk of potential component failure. However, the manufacturing of smart materials is a huge challenge. The recent advances in 3D printing technologies have opened new possibilities for manufacturing smart materials. The 3D printing technologies are further extended to 4D printing, which essentially involves fabricating 3D smart structures. The goal of this research is to investigate the manufacturing challenges involved in the 4D printing of smart polymer materials for UAV applications. The manufacturing process consists of a combination of smart polymer materials in conjunction with SLA-based 3D printing technology. The study will involve extensive theoretical investigations followed by experimental studies. The results of this study are expected to open up newer possibilities for using smart polymer materials at commercial scales.
Multi-Soliton Dynamics of Anti-Self-Dual Gauge Fields
Creators: name: Hamanaka, Masashi
name: Huang, Shan-Chi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We study dynamics of multi-soliton solutions of anti-self-dual Yang-Mills equations for G=GL(2,C) in four-dimensional spaces. The one-soliton solution can be interpreted as a codimension-one soliton in four-dimensional spaces because the principal peak of action density localizes on a three-dimensional hyperplane. We call it the soliton wall. We prove that in the asymptotic region, the n-soliton solution possesses n isolated localized lumps of action density, and interpret it as n intersecting soliton walls. More precisely, each action density lump is essentially the same as a soliton wall because it preserves its shape and "velocity" except for a position shift of principal peak in the scattering process. The position shift results from the nonlinear interactions of the multi-solitons and is called the phase shift. We calculate the phase shift factors explicitly and find that the action densities can be real-valued in three kind of signatures. Finally, we show that the gauge group can be G=U(2) in the Ultrahyperbolic space (the split signature (+, +, -, -)). This implies that the intersecting soliton walls could be realized in all region in N=2 string theories. It is remarkable that quasideterminants dramatically simplify the calculations and proofs.
description: 21 pages; v3: minor changes, proof of unitarity simplified, version to appear in JHEP
Gender and unionism : representations in hotel worker unions
Creators: name: Jamieson, Natalie
Publisher: name: University of British Columbia
Year: 2009

description: This thesis focuses on the representations of gender and unionism in two hotel worker unions in Vancouver; one is an American hotel worker union (Local 40) and the other a Canadian, male, industrial worker union (CAIMAW). Between 1982 and 1984 these unions struggled over the rights to represent hotel workers. Rather than focus only on the complex series of events and allegations that marked the struggle, in this thesis I explore the meanings, ideologies and understandings of two different union discourses, one about gender and the other about unionism. Gendered ideologies and gendered union practices are expressed in the daily actions of unions and union officials. In particular I examine the circumstances of the struggle, and the organisation practices employed by Local 40 and CAIMAW in the hotels, to explore how the meanings of gender and unionism are expressed and negotiated within unions. The struggle itself was couched both in terms of nationalism (ie Canadian versus American International unions), and union organisation. Despite women’s predominance as hotel employees, gender and the concerns of women workers, were neglected as an issue.
Explicit Perturbations to the Stabilizer $τ= {\rm i}$ of Modular $A^\prime_5$ Symmetry and Leptonic CP Violation
Creators: name: Wang, Xin
name: Zhou, Shun
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In a class of neutrino mass models with modular flavor symmetries, it has been observed that CP symmetry is preserved at the fixed point (or stabilizer) of the modulus parameter $τ= {\rm i}$, whereas significant CP violation emerges within the neighbourhood of this stabilizer. In this paper, we first construct a viable model with the modular $A^\prime_5$ symmetry, and explore the phenomenological implications for lepton masses and flavor mixing. Then, we introduce explicit perturbations to the stabilizer at $τ= {\rm i}$, and present both numerical and analytical results to understand why a small deviation from the stabilizer leads to large CP violation. As low-energy observables are very sensitive to the perturbations to model parameters, we further demonstrate that the renormalization-group running effects play an important role in confronting theoretical predictions at the high-energy scale with experimental measurements at the low-energy scale.
description: 33 pages, 5 figures. More discussions added, to be published in JHEP
Theoretical mass loss rates of cool main-sequence stars
Creators: name: Holzwarth, V.
name: Jardine, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We develop a model for the wind properties of cool main-sequence stars, which comprises their wind ram pressures, mass fluxes, and terminal wind velocities. The wind properties are determined through a polytropic magnetised wind model, assuming power laws for the dependence of the thermal and magnetic wind parameters on the stellar rotation rate. We use empirical data to constrain theoretical wind scenarios, which are characterised by different rates of increase of the wind temperature, wind density, and magnetic field strength. Scenarios based on moderate rates of increase yield wind ram pressures in agreement with most empirical constraints, but cannot account for some moderately rotating targets, whose high apparent mass loss rates are inconsistent with observed coronal X-ray and magnetic properties. For fast magnetic rotators, the magneto-centrifugal driving of the outflow can produce terminal wind velocities far in excess of the surface escape velocity. Disregarding this aspect in the analyses of wind ram pressures leads to overestimations of stellar mass loss rates. The predicted mass loss rates of cool main-sequence stars do not exceed about ten times the solar value. Our results are in contrast with previous investigations, which found a strong increase of the stellar mass loss rates with the coronal X-ray flux. Owing to the weaker dependence, we expect the impact of stellar winds on planetary atmospheres to be less severe and the detectability of magnetospheric radio emission to be lower then previously suggested. Considering the rotational evolution of a one solar-mass star, the mass loss rates and the wind ram pressures are highest during the pre-main sequence phase.
description: 12 pages, 11 figures, accepted for publication by A&A
COGNITIVE APPROACH TO ANALYZE ALLUSIONS IN THE EXAMPLE OF 'ODE TO A NIGHTINGALE' BY KEATS JOHN
Creators: name: Askarova, Maftuna
Publisher: name: Zenodo
Year: 2024

description: The article attempts to illustrate the role of allusion in a literary work along with its cognitive peculiarities which will be analyzed within the framework of poetic text. The main purpose of the article is to show the function of the intertextual marker in the process of decoding imaginary descriptions and details hidden by the writer intended to be revealed.
Evolution of ferromagnetic order in URhGe alloyed with Ru, Co and Si
Creators: name: Sakarya, S.
name: Huy, N. T.
name: van Dijk, N. H.
name: de Visser, A.
name: Klaasse, J. C. P.
name: Wagemaker, M.
name: Moleman, A. C.
name: Gortenmulder, T. J.
name: Uhlarz, M.
name: Loehneysen, H. v.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have investigated the evolution of ferromagnetic order in the correlated metal URhGe (Curie temperature $T_{\rm C} = $9.5 K) by chemical substitution of Ru, Co and Si. Polycrystalline samples URh$_{1-x}$Ru$_x$Ge ($x \leq $0.6), URh$_{1-x}$Co$_x$Ge ($x \leq $0.9) and URhGe$_{1-x}$Si$_x$ ($x \leq $0.2) have been prepared and the magnetic properties have been investigated by magnetization and transport experiments. In the case of Ru doping, $T_{\rm C}$ initially increases, but then decreases linearly as a function of $x$ and is completely suppressed for $x_{\rm cr} \approx 0.38$. The Curie temperature in the URh$_{1-x}$Co$_x$Ge series has a broad maximum $T_{\rm C} = 20$ K near $x=0.6$ and then drops to 8 K for $x=0.9$. In the case of Si doping $T_{\rm C}$ stays roughly constant. We conclude that the alloy systems URh$_{1-x}$Ru$_x$Ge and URh$_{1-x}$Co$_x$Ge are interesting candidates to study the ferromagnetic instability.
description: 15 pages, 12 figures; revised & shortened version
Decoding EEG Brain Activity for Multi-Modal Natural Language Processing
Creators: name: Hollenstein, Nora
name: Renggli, Cedric
name: Glaus, Benjamin
name: Barrett, Maria
name: Troendle, Marius
name: Langer, Nicolas
name: Zhang, Ce
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Until recently, human behavioral data from reading has mainly been of interest to researchers to understand human cognition. However, these human language processing signals can also be beneficial in machine learning-based natural language processing tasks. Using EEG brain activity to this purpose is largely unexplored as of yet. In this paper, we present the first large-scale study of systematically analyzing the potential of EEG brain activity data for improving natural language processing tasks, with a special focus on which features of the signal are most beneficial. We present a multi-modal machine learning architecture that learns jointly from textual input as well as from EEG features. We find that filtering the EEG signals into frequency bands is more beneficial than using the broadband signal. Moreover, for a range of word embedding types, EEG data improves binary and ternary sentiment classification and outperforms multiple baselines. For more complex tasks such as relation detection, further research is needed. Finally, EEG data shows to be particularly promising when limited training data is available.
Agricultural Prospects in Central America
Creators: name: Urban, Francis S.
name: Urban, Francis S.
Publisher: name: Unknown
Year: 1969
Subjects: Crop Production/Industries
Demand and Price Analysis
Food Consumption/Nutrition/Food Safety
International Relations/Trade
Livestock Production/Industries
Research Methods/ Statistical Methods

description: This report is a brief review of the Projections of Supply and Demand for Agricultural Products in Central America Through 1980, a market development study conducted by the Battelle Memorial Institute of Columbus, Ohio, under contract with the U.S. Department of Agriculture. The study is one of a series initiated by the USDA and designed to evaluate the long-term potential supply and demand for agricultural products throughout the world. Data used as a basis for projections are in greater part from Central American sources. However, because of the scarcity of statistical material in the region, some extraregional data had to be used. Study results expressed herein do not necessarily reflect the views of the U.S. Department of Agriculture.
Supplementary Material for: Privacy requirements elicitation: A systematic literature review and perception analysis of IT practitioners
Creators: name: Anonymous
Publisher: name: Zenodo
Year: 2021
Subjects: Privacy Requirements Elicitation
Systematic Literature Review
Methodologies
Techniques
Tools

description: During the software development process and throughout the software lifecycle, organizations must guarantee users’ privacy by protecting personal data. There are several studies in the literature proposing methodologies, techniques, and tools for privacy requirements elicitation. These studies report that practitioners must use systematic approaches to specify these requirements during initial software development activities to avoid users’ data privacy breaches. The main goal of this study is to identify which methodologies, techniques, and tools are used in privacy requirements elicitation in the literature. We have also investigated Information Technology (IT) practitioners’ perceptions regarding the methodologies, techniques, and tools identified in the literature. We have carried out a systematic literature review (SLR) to identify the methodologies, techniques, and tools used for privacy requirements elicitation. Besides, we have surveyed IT practitioners to understand their perception of using these techniques and tools in the software development process. We have found several methodologies, techniques, and tools proposed in the literature to carry out privacy requirements elicitation. Out of 78 studies cataloged within the SLR, most of them did not verify their methodologies and techniques in a practical case study or illustrative contexts (38 studies), and less than 35% of them (26 studies) experimented with their propositions within an industry context. The Privacy Safeguard method (PriS) is the best known among the 198 practitioners in the industry who participated in the survey. Moreover, use cases and user story are their most-used techniques. This qualitative study shows a perception of IT practitioners different from that presented in other research papers, and suggests that methodologies, techniques, and tools play an important role in IT practitioners’ perceptions about privacy requirements elicitation.
Essential Inputs and Minimal Tree Automata
Creators: name: Damyanov, Ivo
name: Shtrakov, Slavcho
Publisher: name: arXiv
Year: 2007
Subjects: subject: Computational Complexity (cs.CC)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences
subject: F.1.1; F.1.2

description: We continue studying essential inputs of trees and automata. Strongly essential inputs of trees are introduced and studied. Various examples for application in Computer Science are shown.
description: 7 pages, 1 figure, Sixth International Conference on Discrete Mathematics and Applications, 31.08-02.09.2001, Bansko
Compact Itinerant Microwave Photonics with Superconducting High-Kinetic Inductance Microstrips
Creators: name: Goldstein, Samuel
name: Pardo, Guy
name: Kirsh, Naftali
name: Gaiser, Niklas
name: Padurariu, Ciprian
name: Kubala, Björn
name: Ankerhold, Joachim
name: Katz, Nadav
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Microwave photonics is a remarkably powerful system for quantum simulation and technologies, but its integration in superconducting circuits, superior in many aspects, is constrained by the long wavelengths and impedance mismatches in this platform. We introduce a solution to these difficulties via compact networks of high-kinetic inductance microstrip waveguides and coupling wires with strongly reduced phase velocities. We demonstrate broadband capabilities for superconducting microwave photonics in terms of routing, emulation and generalized linear and nonlinear networks.
description: 4 pages, 4 figures (not including figures in supplemental material)
Epidemic dynamics on metapopulation networks with node2vec mobility
Creators: name: Meng, Lingqi
name: Masuda, Naoki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Metapopulation models have been a powerful tool for both theorizing and simulating epidemic dynamics. In a metapopulation model, one considers a network composed of subpopulations and their pairwise connections, and individuals are assumed to migrate from one subpopulation to another obeying a given mobility rule. While how different mobility rules affect epidemic dynamics in metapopulation models has been studied, there have been relatively few efforts on comparison of the effects of simple (i.e., unbiased) random walks and more complex mobility rules. Here we study a susceptible-infectious-susceptible (SIS) dynamics in a metapopulation model, in which individuals obey a parametric second-order random-walk mobility rule called the node2vec. We map the second-order mobility rule of the node2vec to a first-order random walk in a network whose each node is a directed edge connecting a pair of subpopulations and then derive the epidemic threshold. For various networks, we find that the epidemic threshold is large (therefore, epidemic spreading tends to be suppressed) when the individuals infrequently backtrack or infrequently visit the common neighbors of the currently visited and the last visited subpopulations than when the individuals obey the simple random walk. The amount of change in the epidemic threshold induced by the node2vec mobility is in general not as large as, but is sometimes comparable with, the one induced by the change in the diffusion rate for individuals.
description: 22 pages, 7 figures