cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The vertex leafage of chordal graphs
Creators: name: Chaplick, Steven
name: Stacho, Juraj
Publisher: name: arXiv
Year: 2011
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences

description: Every chordal graph $G$ can be represented as the intersection graph of a collection of subtrees of a host tree, a so-called {\em tree model} of $G$. The leafage $\ell(G)$ of a connected chordal graph $G$ is the minimum number of leaves of the host tree of a tree model of $G$. The vertex leafage $\vl(G)$ is the smallest number $k$ such that there exists a tree model of $G$ in which every subtree has at most $k$ leaves. The leafage is a polynomially computable parameter by the result of \cite{esa}. In this contribution, we study the vertex leafage. We prove for every fixed $k\geq 3$ that deciding whether the vertex leafage of a given chordal graph is at most $k$ is NP-complete by proving a stronger result, namely that the problem is NP-complete on split graphs with vertex leafage of at most $k+1$. On the other hand, for chordal graphs of leafage at most $\ell$, we show that the vertex leafage can be calculated in time $n^{O(\ell)}$. Finally, we prove that there exists a tree model that realizes both the leafage and the vertex leafage of $G$. Notably, for every path graph $G$, there exists a path model with $\ell(G)$ leaves in the host tree and it can be computed in $O(n^3)$ time.
Sympathetic cooling of polyatomic molecules with S-state atoms in a magnetic trap
Creators: name: Tscherbul, T. V.
name: Yu, H-G.
name: Dalgarno, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present a rigorous theoretical study of low-temperature collisions of polyatomic molecular radicals with ^1S_0 atoms in the presence of an external magnetic field. Accurate quantum scattering calculations based on ab initio and scaled interaction potentials show that collision-induced spin relaxation of the prototypical organic molecule CH_2(X^3B_1) (methylene) and nine other triatomic radicals in cold 3He gas occurs at a slow rate, demonstrating that cryogenic buffer-gas cooling and magnetic trapping of these molecules is feasible with current technology. Our calculations further suggest that it may be possible to create ultracold gases of polyatomic molecules by sympathetic cooling with alkaline-earth atoms in a magnetic trap.
description: 5 pages, 3 figures, 1 table
Simulating Transportation and Environmental Outcomes of Electric Vehicle Adoption Scenarios: An Application to the Windsor Census Metropolitan Area
Creators: name: Dimatulac, Terence
name: Maoh, Hanna
name: Dimatulac, Terence
name: Maoh, Hanna
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
A Consumer Latent Class Choice Model to Assess Prospects for Electric Vehicles in Canada
Creators: name: Ferguson, Mark
name: Mahmoud, Moataz
name: Higgins, Chris
name: Abotalebi, Elnaz
name: Kanaroglou, Pavlos
name: Ferguson, Mark
name: Mahmoud, Moataz
name: Higgins, Chris
name: Abotalebi, Elnaz
name: Kanaroglou, Pavlos
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Photoemission Spectroscopy of Magnetic and Non-magnetic Impurities on the Surface of the Bi$_2$Se$_3$ Topological Insulator
Creators: name: Valla, T.
name: Pan, Z. -H.
name: Gardner, D. R.
name: Lee, Y. S.
name: Chu, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Dirac-like surface states on surfaces of topological insulators have a chiral spin structure that suppresses back-scattering and protects the coherence of these states in the presence of non-magnetic scatterers. In contrast, magnetic scatterers should open the back- scattering channel via the spin-flip processes and degrade the state's coherence. We present angle-resolved photoemission spectroscopy studies of the electronic structure and the scattering rates upon adsorption of various magnetic and non-magnetic impurities on the surface of Bi$_2$Se$_3$, a model topological insulator. We reveal a remarkable insensitivity of the topological surface state to both non-magnetic and magnetic impurities in the low impurity concentration regime. Scattering channels open up with the emergence of hexagonal warping in the high-doping regime, irrespective of the impurity's magnetic moment.
description: 5 pages, 4 figures
After transition : life outcomes after radical acceleration
Creators: name: Lin, Rachel (Rou Chen)
Publisher: name: University of British Columbia
Year: 2022

description: Radical acceleration is a unique educational tool that has been used for profoundly gifted students. Insights into formalized radical acceleration high school programs that result in early entry to university are limited in the extant literature because these programs are also limited in implementation. Partnered with the University of British Columbia, the University Transition Program (UTP) is a radical acceleration program that supports profoundly gifted students to complete a traditional five-year high school program in two years. These radical accelerands matriculate into university as young as 14-15 years old. Through surveying the UTP alumni, this study aimed to investigate the research questions: What are radical accelerands’ experiences of and retrospective reflections on radical acceleration? How has radical acceleration impacted these accelerands’ life outcomes? Results from a retrospective survey questionnaire revealed that alumni had diverse opinions surrounding their academic, socioemotional, and vocational preparedness and satisfaction as accelerands and early entrants to university. There were also indications that these experiences may differ based on prior educational history and biological sex. The findings from this study explore the holistic needs and desires of accelerands and early entrance, which serves to inform future implementation of radical acceleration in the most optimal way for students to thrive in their postsecondary years and beyond.
Investigating Near-Road Particle Number Concentrations Along A Busy Urban Corridor with Varying Built Environment Characteristics
Creators: name: Xu, Junshi
name: Wang, An
name: Hatzopoulou, Marianne
name: Xu, Junshi
name: Wang, An
name: Hatzopoulou, Marianne
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Diffeomorphisms with various $C^1$ stable properties
Creators: name: Sun, Wenxiang
name: Tian, Xueting
Publisher: name: arXiv
Year: 2010
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: Let $M$ be a smooth compact manifold and $Λ$ be a compact invariant set. In this paper we prove that for every robustly transitive set $Λ$, $f|_Λ$ satisfies a $C^1-$generic-stable shadowable property (resp., $C^1-$generic-stable transitive specification property or $C^1-$generic-stable barycenter property) if and only if $Λ$ is a hyperbolic basic set. In particular, $f|_Λ$ satisfies a $C^1-$stable shadowable property (resp., $C^1-$stable transitive specification property or $C^1-$stable barycenter property) if and only if $Λ$ is a hyperbolic basic set. Similar results are valid for volume-preserving case.
description: 8 pages
Assessment of Exposure to Traffic-Related Air Pollution in a Large Urban Area: Impacts of Individual Mobility and Transit Investment Scenarios
Creators: name: Shekarrizfard, Maryam
name: Hatzopoulou, Marianne
name: Shekarrizfard, Maryam
name: Hatzopoulou, Marianne
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
An Analysis of the Status of Undergraduate Transportation Management Education in the United States
Creators: name: Stewart, Richard D.
name: Burger, Natalie
name: Hansen, Erica
name: Johnson, Gavin
name: Stewart, Richard D.
name: Burger, Natalie
name: Hansen, Erica
name: Johnson, Gavin
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Planning For Real Or For Show? An Analysis of the Completion of Montreal's Transportation Plans
Creators: name: Barrieau, Pierre
name: Silvestrin-Racine, Victor
name: Barrieau, Pierre
name: Silvestrin-Racine, Victor
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Reconstruction of Binary Functions and Shapes from Incomplete Frequency Information
Creators: name: Mao, Yu
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Theory (cs.IT)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 49M20, 65K10, 90C26, 93B40

description: The characterization of a binary function by partial frequency information is considered. We show that it is possible to reconstruct binary signals from incomplete frequency measurements via the solution of a simple linear optimization problem. We further prove that if a binary function is spatially structured (e.g. a general black-white image or an indicator function of a shape), then it can be recovered from very few low frequency measurements in general. These results would lead to efficient methods of sensing, characterizing and recovering a binary signal or a shape as well as other applications like deconvolution of binary functions blurred by a low-pass filter. Numerical results are provided to demonstrate the theoretical arguments.
description: IEEE Transactions on Information Theory, 2012
Hierarchical formation of bulgeless galaxies: Why outflows have low angular momentum
Creators: name: Brook, C. B.
name: Governato, F.
name: Roskar, R.
name: Stinson, G.
name: Brooks, A.
name: Wadsley, J.
name: Quinn, T.
name: Gibson, B. K.
name: Snaith, O.
name: Pilkington, K.
name: House, E.
name: Pontzen, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Using high resolution, fully cosmological smoothed particle hydro-dynamical simulations of dwarf galaxies in a Lambda cold dark matter Universe, we show how baryons attain a final angular momentum distribution which allows pure disc galaxies to form. Blowing out substantial amounts of gas through supernovae and stellar winds, which is well supported observationally, is a key ingredient in forming bulgeless discs. We outline why galactic outflows preferentially remove low angular momentum material, and show that this is a natural result when structure forms in a cold dark matter cosmology. The driving factors are a) the mean angular momentum of accreted material increases with time, b) lower potentials at early times, c) the existence of an extended reservoir of high angular momentum gas which is not within star forming regions, meaning that only gas from the inner region (low angular momentum gas) is expelled and d) the tendency for outflows to follow the path of least resistance which is perpendicular to the disc. We also show that outflows are enhanced during mergers, thus expelling much of the gas which has lost its angular momentum during these events, and preventing the formation of "classical", merger driven bulges in low mass systems. Stars formed prior to such mergers form a diffuse, extended stellar halo component.
description: accepted version: MNRAS in press
Monte Carlo simulation with Tensor Network States
Creators: name: Wang, Ling
name: Pizorn, Iztok
name: Verstraete, Frank
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It is demonstrated that Monte Carlo sampling can be used to efficiently extract the expectation value of projected entangled pair states with large virtual bond dimension. We use the simple update rule introduced by Xiang et al. to obtain the tensors describing the ground state wavefunction of the antiferromagnetic Heisenberg model and evaluate the finite size energy and staggered magnetization for square lattices with periodic boundary conditions of sizes up to L=16 and virtual bond dimensions up to D=16. The finite size magnetization errors are 0.003(2) and 0.013(2) at D=16 for a system of size L=8,16 respectively. Finite D extrapolation provides exact finite size magnetization for L=8, and reduces the magnetization error to 0.005(3) for L=16, significantly improving the previous state of the art results.
description: 6 pages, 7 figures
Quantization rule solution to the Hulthén potential in arbitrary dimension by a new approximate scheme for the centrifugal term
Creators: name: Ikhdair, Sameer M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The bound state energies and wave functions for a particle exposed to the Hulthén potential field in the D-dimensional space are obtained within the improved quantization rule for any arbitrary l state. The present approximation scheme used to deal with the centrifugal term in the effective Hulthén potential is systematic and accurate. The solutions for the three-dimensional (D=3) case and the s-wave (l=0) case are briefly discussed. Keywords: Hulthén potential, improved quantization rule, approximation schemes. 03.65.Ge, 12.39.Jh
description: 15 pages. arXiv admin note: substantial text overlap with arXiv:1009.5083
Towards human-like kinematics in industrial robotic arms: a case study on a UR3 robot
Creators: name: Wolniakowski, Adam
name: Miatliuk, Kanstantsin
name: Quintana, Jose J.
name: Ferrer, Miguel A.
name: Diaz, Moises
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Safety in industrial robotic environments is a hot research topic in the area of human-robot interaction (HRI). Up to now, a robotic arm on an assembly line interacts with other machines away from human workers. Nowadays, robotic arm manufactures are aimed to their robots could increasingly perform tasks collaborating with humans. One of the ways to improve this collaboration is by making the movement of robots more humanlike. This way, it would be easier for a human to foresee the movement of the robot and approach it without fear of contact. The main difference between the movement of a human and of a robotic arm is that the former has a bell-shaped speed profile while the latter has a uniform speed one. To generate this speed profile, the kinematic theory of rapid human movements and its Sigma-Lognormal model has been used. This model is widely used to explain most of the basic phenomena related to the control of human movements. Both human-like and robotic-like movements are transferred to the UR3 robot. In this paper we detail the how the UR3 robot was programmed to produce both kinds of movement. The dissimilarities result between the input motion and output motion to the robot confirm the possibility to develop human-like velocities in the UR3 robot.
description: 6 pages, 5 figures
SMARTPLANS: Simulation Model for Assessing the Ramifications of Transportation Policies and Land-Use Scenarios
Creators: name: Maoh, Hanna
name: Gingerich, Kevin
name: Maoh, Hanna
name: Gingerich, Kevin
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Entangled Wavefunctions from Classical Oscillator Amplitudes
Creators: name: Briggs, J. S.
name: Eisfeld, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the first days of quantum mechanics Dirac pointed out an analogy between the time-dependent coefficients of an expansion of the Schrödinger equation and the classical position and momentum variables solving Hamilton's equations. Here it is shown that the analogy can be made an equivalence in that, in principle, systems of classical oscillators can be constructed whose position and momenta variables form time-dependent amplitudes which are identical to the complex quantum amplitudes of the coupled wavefunction of an N-level quantum system with real coupling matrix elements. Hence classical motion can reproduce quantum coherence.
description: extended version
Meson screening masses from lattice QCD with two light and the strange quark
Creators: name: Cheng, M.
name: Datta, S.
name: Francis, A.
name: van der Heide, J.
name: Jung, C.
name: Kaczmarek, O.
name: Karsch, F.
name: Laermann, E.
name: Mawhinney, R. D.
name: Miao, C.
name: Mukherjee, S.
name: Petreczky, P.
name: Rantaharju, J.
name: Schmidt, C.
name: Soeldner, W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present results for screening masses of mesons built from light and strange quarks in the temperature range of approximately between 140 MeV to 800 MeV. The lattice computations were performed with 2+1 dynamical light and strange flavors of improved (p4) staggered fermions along a line of constant physics defined by a pion mass of about 220 MeV and a kaon mass of 500 MeV. The lattices had temporal extents Nt = 4, 6 and 8 and aspect ratios of Ns / Nt \geq 4. At least up to a temperature of 140 MeV the pseudo-scalar screening mass remains almost equal to the corresponding zero temperature pseudo-scalar (pole) mass. At temperatures around 3Tc (Tc being the transition temperature) the continuum extrapolated pseudo-scalar screening mass approaches very close to the free continuum result of 2 πT from below. On the other hand, at high temperatures the vector screening mass turns out to be larger than the free continuum value of 2 πT. The pseudo-scalar and the vector screening masses do not become degenerate even for a temperature as high as 4Tc. Using these mesonic spatial correlation functions we have also investigated the restoration of chiral symmetry and the effective restoration of the axial symmetry. We have found that the vector and the axial-vector screening correlators become degenerate, indicating chiral symmetry restoration, at a temperature which is consistent with the QCD transition temperature obtained in previous studies. On the other hand, the pseudo-scalar and the scalar screening correlators become degenerate only at temperatures larger than 1.3Tc, indicating that the effective restoration of the axial symmetry takes place at a temperature larger than the QCD transition temperature.
description: Published version
The Tale of Taxi Reforms in Two Cities: The Failure of Closed Entry
Creators: name: Monterio, Joseph
name: Prentice, Barry E.
name: Monterio, Joseph
name: Prentice, Barry E.
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Understanding the Observed Evolution of the Galaxy Luminosity Function from z=6-10 in the Context of Hierarchical Structure Formation
Creators: name: Muñoz, Joseph A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Recent observations of the Lyman-break galaxy (LBG) luminosity function (LF) from z~6-10 show a steep decline in abundance with increasing redshift. However, the LF is a convolution of the mass function of dark matter halos (HMF)--which also declines sharply over this redshift range--and the galaxy-formation physics that maps halo mass to galaxy luminosity. We consider the strong observed evolution in the LF from z~6-10 in this context and determine whether it can be explained solely by the behavior of the HMF. From z~6-8, we find a residual change in the physics of galaxy formation corresponding to a ~0.5 dex increase in the average luminosity of a halo of fixed mass. On the other hand, our analysis of recent LF measurements at z~10 shows that the paucity of detected galaxies is consistent with almost no change in the average luminosity at fixed halo mass from z~8. The LF slope also constrains the variation about this mean such that the luminosity of galaxies hosted by halos of the same mass are all within about an order-of-magnitude of each other. We show that these results are well-described by a simple model of galaxy formation in which cold-flow accretion is balanced by star formation and momentum-driven outflows. If galaxy formation proceeds in halos with masses down to 10^8 Msun, then such a model predicts that LBGs at z~10 should be able to maintain an ionized intergalactic medium as long as the ratio of the clumping factor to the ionizing escape fraction is C/f_esc < 10.
description: 15 pages, 2 figures; results unchanged; accepted by JCAP
On the representation theory of finite J-trivial monoids
Creators: name: Denton, Tom
name: Hivert, Florent
name: Schilling, Anne
name: Thiéry, Nicolas M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Representation Theory (math.RT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 20M30, 16G99, 20C08, 06F05

description: In 1979, Norton showed that the representation theory of the 0-Hecke algebra admits a rich combinatorial description. Her constructions rely heavily on some triangularity property of the product, but do not use explicitly that the 0-Hecke algebra is a monoid algebra. The thesis of this paper is that considering the general setting of monoids admitting such a triangularity, namely J-trivial monoids, sheds further light on the topic. This is a step to use representation theory to automatically extract combinatorial structures from (monoid) algebras, often in the form of posets and lattices, both from a theoretical and computational point of view, and with an implementation in Sage. Motivated by ongoing work on related monoids associated to Coxeter systems, and building on well-known results in the semi-group community (such as the description of the simple modules or the radical), we describe how most of the data associated to the representation theory (Cartan matrix, quiver) of the algebra of any J-trivial monoid M can be expressed combinatorially by counting appropriate elements in M itself. As a consequence, this data does not depend on the ground field and can be calculated in O(n^2), if not O(nm), where n=|M| and m is the number of generators. Along the way, we construct a triangular decomposition of the identity into orthogonal idempotents, using the usual Möbius inversion formula in the semi-simple quotient (a lattice), followed by an algorithmic lifting step. Applying our results to the 0-Hecke algebra (in all finite types), we recover previously known results and additionally provide an explicit labeling of the edges of the quiver. We further explore special classes of J-trivial monoids, and in particular monoids of order preserving regressive functions on a poset, generalizing known results on the monoids of nondecreasing parking functions.
description: 41 pages; 4 figures; added Section 3.7.4 in version 2; incorporated comments by referee in version 3
Characterizing Near-Road Air Pollution Using Local-Scale Emission and Dispersion Models and Validation Against In-Situ Measurements
Creators: name: Wang, An
name: Fallahshorshani, Masoud
name: Xu, Junshi
name: Hatzopoulou, Marianne
name: Wang, An
name: Fallahshorshani, Masoud
name: Xu, Junshi
name: Hatzopoulou, Marianne
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Microscopic Modeling for Atmospheric Urban Pollutant Dispersion in Dense Urban Road Networks
Creators: name: Shorshani, M. Fallah
name: Hatzopoulou, Marianne
name: Shorshani, M. Fallah
name: Hatzopoulou, Marianne
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Geometrothermodynamics of five dimensional black holes in Einstein-Gauss-Bonnet-theory
Creators: name: Taj, Safia
name: Quevedo, Hernando
name: Sanchez, Alberto
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the thermodynamic properties of 5D static and spherically symmetric black holes in (i) Einstein-Maxwell-Gauss-Bonnet theory, (ii) Einstein-Maxwell-Gauss-Bonnet theory with negative cosmological constant, and in (iii) Einstein-Yang-Mills-Gauss-Bonnet theory. To formulate the thermodynamics of these black holes we use the Bekenstein-Hawking entropy relation and, alternatively, a modified entropy formula which follows from the first law of thermodynamics of black holes. The results of both approaches are not equivalent. Using the formalism of geometrothermodynamics, we introduce in the manifold of equilibrium states a Legendre invariant metric for each black hole and for each thermodynamic approach, and show that the thermodynamic curvature diverges at those points where the temperature vanishes and the heat capacity diverges.
description: New sections added, references added
Anomalies, absence of local equilibrium and universality in 1-d particles systems
Creators: name: Giberti, Claudio
name: Rondoni, Lamberto
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: One dimensional systems are under intense investigation, both from theoretical and experimental points of view, since they have rather peculiar characteristics which are of both conceptual and technological interest. We analyze the dependence of the behaviour of one dimensional, time reversal invariant, nonequilibrium systems on the parameters defining their microscopic dynamics. In particular, we consider chains of identical oscillators interacting via hard core elastic collisions and harmonic potentials, driven by boundary Nosé-Hoover thermostats. Their behaviour mirrors qualitatively that of stochastically driven systems, showing that anomalous properties are typical of physics in one dimension. Chaos, by itslef, does not lead to standard behaviour, since it does not guarantee local thermodynamic equilibrium. A linear relation is found between density fluctuations and temperature profiles. This link and the temporal asymmetry of fluctuations of the main observables are robust against modifications of thermostat parameters and against perturbations of the dynamics.
description: 26 pages, 16 figures, revised text, two appendices added
Part of the Problem or Part of the Solution? How Canada's Railways Can Help Address Climate Change
Creators: name: Gullo, Michael
name: Rosales, Enrique
name: Gullo, Michael
name: Rosales, Enrique
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
New Trends in Elearning - Mobile Days
Creators: name: Catalin, Radu
Publisher: name: Editura Universitara
Year: 2012
Subjects: subject: 0 Social sciences
subject: 37 Education
subject: 371 Instructional design
subject: 004:37 Elearning

description: The literature on mLearning points to a variety of benefits that mobile phones could have on the educational sector. For heuristic purposes, the impacts of mobile phones on educational outcomes  that are identified in the mLearning literature can be classified into two broad categories. On the one hand, mobiles supposedly impact educational outcomes by improving access to education while maintaining the quality of education delivered. On the other hand, mobiles purportedly impact educational outcomes by facilitating alternative learning processes and instructional methods collectively known as new learning.
NComputer Games Used in Teaching of Geography
Creators: name: Helena-Maria, Sabo
Publisher: name: Editura Universitara
Year: 2012
Subjects: subject: 0 Social sciences
subject: 37 Education
subject: 371 Instructional design
subject: 004:37 Elearning

description: In this article, we present some computer games, which are attractive to children, using concrete  applications about natural hazards and urban planning. Risk management games are very helpful tot  each pupils how to protect themselves against the destruction power of natural hazards. Playing these games pupils learn how to manage the risk in case of a natural hazards, and they will have some knowledge about how to plan a city, how to develop it. The focus is on the presentation of the OIKOS risk management game. This game is considered very important in teaching geography; this is also an important aspect: sometimes we take decisions without thinking of the future. In this way, it follows the formation of a factor of environment awareness and responsibilities.
Additional file 2 of Effects of airway pressure release ventilation on multi-organ injuries in severe acute respiratory distress syndrome pig models
Creators: name: Ma, Aijia
name: Wang, Bo
name: Cheng, Jiangli
name: Dong, Meiling
name: Li, Yang
name: Wei, Canzheng
name: Zhou, Yongfang
name: Xue, Yang
name: Gao, Hui
name: Zhao, Lican
name: Li, Siyu
name: Qin, Yiwei
name: Zhang, Mengni
name: Wu, Qin
name: Yang, Jing
name: Kang, Yan
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy

description: Additional file 2. Supplementary tables of organ injury score. Supplementary table 1. Lung injury score (right upper lobe of lung). Supplementary table 2. Lung injury score (right middle lobe of lung). Supplementary table 3. Lung injury score (right lower lobe of lung). Supplementary table 4. Kidney injury score. Supplementary table 5. Intestine injury score. Supplementary table 6. Liver injury score. Supplementary table 7. Heart injury score.
Life Cycle Assessment of a Diesel and a Compressed Natural Gas Medium-Duty Truck. The Case of Toronto
Creators: name: Zhou, Taylor
name: MacLean, Heather L.
name: Roorda, Matthew
name: Zhou, Taylor
name: MacLean, Heather L.
name: Roorda, Matthew
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Chains of modular elements and shellability
Creators: name: Woodroofe, Russ
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 05E45 (Primary) 20D30, 06A07 (Secondary)

description: Let L be a lattice admitting a left-modular chain of length r, not necessarily maximal. We show that if either L is graded or the chain is modular, then the (r-2)-skeleton of L is vertex-decomposable (hence shellable). This proves a conjecture of Hersh. Under certain circumstances, we can find shellings of higher skeleta. For instance, if the left-modular chain consists of every other element of some maximum length chain, then L itself is shellable. We apply these results to give a new characterization of finite solvable groups in terms of the topology of subgroup lattices. Our main tool relaxes the conditions for an EL-labeling, allowing multiple ascending chains as long as they are lexicographically before non-ascending chains. We extend results from the theory of EL-shellable posets to such labelings. The shellability of certain skeleta is one such result. Another is that a poset with such a labeling is homotopy equivalent (by discrete Morse theory) to a cell complex with cells in correspondence to weakly descending chains.
description: 20 pages, 1 figure; v2 has minor fixes; v3 corrects the technical lemma in Section 4, and improves the exposition throughout
Association of prenatal and intrapartum antibiotic exposure with autism spectrum disorder in offspring : a population-based study from British Columbia
Creators: name: Nitschke, Amanda
Publisher: name: University of British Columbia
Year: 2022

description: Background: Antibiotics are among the most used medications during pregnancy, and while their short-term benefits are clear, their potential long-term effects are underexplored. Antibiotic exposure induces changes in the maternal microbiome, which could in turn influence the development of the infant’s microbiome with implications for neurodevelopment. This thesis examined the associations of 1) intrapartum antibiotic exposure and 2) prenatal antibiotic exposure with autism spectrum disorder (ASD) in offspring. Methods: Using multiple linked population-level datasets, we examined everyone who delivered a live singleton term infant in British Columbia, Canada between April 1st 2000 and December 31st 2014. To examine the associations among pregnant individuals treated for the same indication, we studied sub-cohorts of those diagnosed 1) as group B streptococcus-positive, and 2) with urinary tract infections. Cox proportional hazards models were used to estimate unadjusted and adjusted hazard ratios. Sensitivity analyses were conducted to examine the impact of different classes of antibiotics, and to assess for dose-response and temporal relationships. Additionally, potential effect modification was examined based on sex and mode of delivery. To account for unmeasured confounding, we ran a conditional logistic regression of discordant sibling pairs. Results: We found no association between intrapartum antibiotic administration and ASD in offspring. In contrast, we observed a small statistically significant increase in risk of ASD associated with prenatal antibiotic exposure. In particular, highest risk was observed if exposure took place during the second trimester, to penicillins or other beta lactams, and for 15 days or longer. Among the cohort restricted to pregnant individuals diagnosed with UTIs, findings showed a positive association between prenatal antibiotics and ASD with an increased effect size; yet, this association was no longer statistically significant, possibly due to a reduced sample size. The relationship between prenatal antibiotic exposure and ASD was no longer significant in the conditional logistic regression. Conclusions: Overall, our findings suggest that the risk of ASD should not factor into clinical decisions on whether to administer antibiotics both prenatally and during labour and delivery. Results may suggest a hypothesized role of impaired fetal metabolic programming by the maternal microbiome and metabolome in ASD development.
Examining the Impact of Sample Size in the Analysis of Bicycle Sharing Systems
Creators: name: Faghih-Imani, Ahmadreza
name: Eluru, Naveen
name: Faghih-Imani, Ahmadreza
name: Eluru, Naveen
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Fermi coordinates, simultaneity, and expanding space in Robertson-Walker cosmologies
Creators: name: Klein, David
name: Randles, Evan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: 83F05, 83C10

description: Explicit Fermi coordinates are given for geodesic observers comoving with the Hubble flow in expanding Robertson-Walker spacetimes, along with exact expressions for the metric tensors in Fermi coordinates. For the case of non inflationary cosmologies, it is shown that Fermi coordinate charts are global, and space-time is foliated by space slices of constant Fermi (proper) time that have finite extent. A universal upper bound for the proper radius of any leaf of the foliation, i.e., for the proper radius of the spatial universe at any fixed time of the geodesic observer, is given. A general expression is derived for the geometrically defined Fermi relative velocity of a test particle (e.g. a galaxy) comoving with the Hubble flow away from the observer. Least upper bounds of superluminal recessional Fermi velocities are given for spacetimes whose scale factors follow power laws, including matter-dominated and radiation-dominated cosmologies. Exact expressions for the proper radius of any leaf of the foliation for this same class of spacetimes are given. It is shown that the radii increase linearly with proper time of the observer moving with the Hubble flow. These results are applied to particular cosmological models.
description: This revised version corrects minor typos
Is the Bloor Danforth Corridor a 'Sensible Location' for a Separated Bike Lane?
Creators: name: Burke, Charles M.
name: Scott, Darren M.
name: Burke, Charles M.
name: Scott, Darren M.
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Tensor structure from scalar Feynman matroids
Creators: name: Kreimer, Dirk
name: Yeats, Karen
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 81T18

description: We show how to interpret the scalar Feynman integrals which appear when reducing tensor integrals as scalar Feynman integrals coming from certain nice matroids.
description: 12 pages, corrections suggested by referees
Chirality waves in two-dimensional magnets
Creators: name: Solenov, D.
name: Mozyrsky, D.
name: Martin, I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically show that moderate interaction between electrons confined to move in a plane and localized magnetic moments leads to formation of a noncoplanar magnetic state. The state is similar to the skyrmion crystal recently observed in cubic systems with the Dzyaloshinskii-Moriya interaction; however, it does not require spin-orbit interaction. The non-coplanar magnetism is accompanied by the ground-state electrical and spin currents, generated via the real-space Berry phase mechanism. We examine the stability of the state with respect to lattice discreteness effects and the magnitude of magnetic exchange interaction. The state can be realized in a number of transition metal and magnetic semiconductor systems.
Développement d’instruments d’évaluation de la fidélité de la réponse à l’intervention dans des écoles primaires francophones québécoises
Creators: name: Demers, Catrine
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2019
Subjects: réponse à l'intervention
fidélité
cadre conceptuel
implantation
instruments

description: La réponse à l’intervention (RAI) est un processus de prise de décision informé par des données qui, à l’aide de l’enseignement et des interventions efficaces, prévient les difficultés de lecture et d’écriture, et améliore ces habiletés pour tous les élèves. Depuis quelques années, plusieurs écoles francophones de la province du Québec implantent la RAI. Le processus des connaissances à la pratique a été choisi pour guider certaines de ces écoles dans leur implantation. Après quelques années d’implantation, ces écoles ont maintenant atteint la phase de ce processus qui vise à surveiller l’utilisation des connaissances. En d’autres mots, cela consiste à évaluer la fidélité, c’est-à-dire évaluer le degré avec lequel le plan a été mis en place comme prévu. Cette thèse avait pour objectif principal de développer des instruments adaptés au contexte francophone québécois afin d’évaluer la fidélité de la RAI. Une méthode mixte a été utilisée selon quatre phases : (1) une étude de délimitation pour développer un cadre conceptuel intégratif de la fidélité, (2) une recension des écrits scientifiques pour déterminer le contenu potentiel des instruments, (3) des rencontres de groupes pour décider du contenu essentiel et pertinent au contexte et (4) des entrevues cognitives afin de prétester les instruments. L’étude de délimitation a inclus 76 documents sur lesquels repose un cadre conceptuel intégratif de la fidélité comprenant deux niveaux et dix dimensions. La recension des écrits a permis de synthétiser 167 articles fournissant les éléments potentiels pour le contenu des instruments de mesure de la fidélité de la RAI. Un total de 50 participants ont pris part à des rencontres de groupes permettant de réduire le nombre d’éléments de plus de la moitié afin de ne garder que le contenu pertinent et essentiel, ainsi que d’obtenir des preuves de la validité de contenu. Des entrevues cognitives avec 35 participants ont permis de prétester les instruments et d’obtenir des preuves de la validité du processus de réponse. Cette thèse a permis le développement d’instruments qui serviront à offrir de la rétroaction sur l’implantation de la RAI dans les écoles francophones québécoises, permettant par le fait même d’améliorer cette implantation. Ces instruments pourront aussi être utilisés pour évaluer la fidélité afin d’éventuellement mener des études d’efficacité.
System-wide Pedestrian Planning Efforts: An Analysis of Current Planning Trends
Creators: name: Andrusko, Andrew
name: Lee, Eunsu
name: Andrusko, Andrew
name: Lee, Eunsu
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Phase space spinor amplitudes for spin 1/2 systems
Creators: name: Watson, P
name: Bracken, A J
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The concept of phase space amplitudes for systems with continuous degrees of freedom is generalized to finite-dimensional spin systems. Complex amplitudes are obtained on both a sphere and a finite lattice, in each case enabling a more fundamental description of pure spin states than that previously given by Wigner functions. In each case the Wigner function can be expressed as the star product of the amplitude and its conjugate, so providing a generalized Born interpretation of amplitudes that emphasizes their more fundamental status. The ordinary product of the amplitude and its conjugate produces a (generalized) spin Husimi function. The case of spin-$\half$ is treated in detail, and it is shown that phase space amplitudes on the sphere transform correctly as spinors under under rotations, despite their expression in terms of spherical harmonics. Spin amplitudes on a lattice are also found to transform as spinors. Applications are given to the phase space description of state superposition, and to the evolution in phase space of the state of a spin-$\half$ magnetic dipole in a time-dependent magnetic field.
description: 19 pages, added new results, fixed typos
Integration of Crowdsourced and Traditional Data for Route Analysis and Route Finding for Pedestrians with Disabilities
Creators: name: Regan, Amelia
name: Christie, Nicola
name: Asadi, Reza
name: Arkhipov, Dmitri
name: Regan, Amelia
name: Christie, Nicola
name: Asadi, Reza
name: Arkhipov, Dmitri
Publisher: name: Unknown
Year: 2016
Subjects: Public Economics

description: Presented at the 51st CTRF (57th TRF) Joint Conference, May 1-4, 2016, Toronto, Ontario
Angular momentum at null infinity in five dimensions
Creators: name: Tanabe, Kentaro
name: Tanahashi, Norihiro
name: Shiromizu, Tetsuya
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, using the Bondi coordinates, we discuss the angular momentum at null infinity in five dimensions and address the Poincare covariance of the Bondi mass and angular momentum. We also show the angular momentum loss/gain law due to gravitational waves. In four dimensions, the angular momentum at null infinity has the supertranslational ambiguity and then it is known that we cannot construct well-defined angular momentum there. On the other hand, we would stress that we can define angular momentum at null infinity without any ambiguity in higher dimensions. This is because of the non-existence of supertranslations in higher dimensions.
description: 15 pages, published version in JMP
The Relationship between Quality of Life and Job Satisfaction  among Primary Education Teachers
Creators: name: Science Step Journal
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Job Satisfaction
subject: School Teachers
subject: Teacher Training

description: This study examines the relationship between quality of life and job satisfaction among primary education teachers. Previous research has highlighted the significant impact of job satisfaction on quality of life across various professions. However, limited studies have specifically addressed this relationship among primary education teachers. The study included 244 male and female teachers from both rural and urban areas across different regions of the Kingdom of Morocco. Participants completed two assessment tools: the Job Satisfaction Scale and the Quality of Life Scale. Statistical analysis of the data revealed a correlation between quality of life and job satisfaction among primary education teachers.
Solution of the noncanonicity puzzle in General Relativity: a new Hamiltonian formulation
Creators: name: Cianfrani, F.
name: Lulli, M.
name: Montani, G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the transformation leading from Arnowitt, Deser, Misner (ADM) Hamiltonian formulation of General Relativity (GR) to the $ΓΓ$ metric Hamiltonian formulation derived from the Lagrangian density which was firstly proposed by Einstein. We classify this transformation as gauged canonical - i.e. canonical modulo a gauge transformation. In such a study we introduce a new Hamiltonian formulation written in ADM variables which differs from the usual ADM formulation mainly in a boundary term firstly proposed by Dirac. Performing the canonical quantization procedure we introduce a new functional phase which contains an explicit dependence on the fields characterizing the 3+1 splitting. Given a specific regularization procedure our new formulation privileges the symmetric operator ordering in order to: have a consistent quantization procedure, avoid anomalies in constraints algebra, be equivalent to the Wheeler-DeWitt (WDW) quantization. Furthermore we show that this result is consistent with a path-integral approach.
description: Accepted for Publication in Physics Letters B. Major revisions in Canonical Quantization section for operator ordering choice and in the definition of 'gauged canonicity' for the classical analysis. 19 pages single column