cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Equilibriums of extremely magnetized compact stars with force-free magnetotunnels
Creators: name: Uryu, Koji
name: Yoshida, Shijun
name: Gourgoulhon, Eric
name: Markakis, Charalampos
name: Fujisawa, Kotaro
name: Tsokaros, Antonios
name: Taniguchi, Keisuke
name: Zamani, Mina
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present numerical solutions for stationary and axisymmetric equilibriums of compact stars associated with extremely strong magnetic fields. The interior of the compact stars is assumed to satisfy ideal magnetohydrodynamic (MHD) conditions, while in the region of negligible mass density the force-free conditions or electromagnetic vacuum are assumed. Solving all components of Einstein's equations, Maxwell's equations, ideal MHD equations, and force-free conditions, equilibriums of rotating compact stars associated with mixed poloidal and toroidal magnetic fields are obtained. It is found that in the extreme cases the strong mixed magnetic fields concentrating in a toroidal region near the equatorial surface expel the matter and form a force-free toroidal magnetotunnel. We also introduce a new differential rotation law for computing solutions associated with force-free magnetosphere, and present other extreme models without the magnetotunnel.
description: 13 pages, 4 figures
Planet formation in the PDS 70 system: Constraining the atmospheric chemistry of PDS 70b and c
Creators: name: Cridland, A. J.
name: Facchini, S.
name: van Dishoeck, E. F.
name: Benisty, M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Understanding the chemical link between protoplanetary disks and planetary atmospheres is complicated by the fact that the popular targets in the study of disks and planets are widely separated both in space and time. The 5 Myr PDS 70 systems offers a unique opportunity to directly compare the chemistry of a giant planet's atmosphere to the chemistry of its natal disk. To that end, we derive our current best physical and chemical model for the PDS 70 disk through forward modelling of the $^{12}$CO, C$^{18}$O, and C$_2$H emission radial profiles with the thermochemical code DALI and find a volatile C/O ratio above unity in the outer disk. Using what we know of the PDS 70 disk today, we analytically estimate the properties of the disk as it was 4 Myr in the past when we assume that the giant planets started their formation, and compute a chemical model of the disk at that time. We compute the formation of PDS 70b and PDS 70c using the standard core accretion paradigm and account for the accretion of volatile and refractory sources of carbon and oxygen to estimate the resulting atmospheric carbon-to-oxygen number ratio (C/O) for these planets. Our inferred C/O ratio of the gas in the PDS 70 disk indicates that it is marginally carbon rich relative to the stellar C/O = 0.44 which we derive from an empirical relation between stellar metallicity and C/O. Under the assumption that the disk has been carbon rich for most of its lifetime, we find that the planets acquire a super-stellar C/O in their atmospheres. If the carbon-rich disk is a relatively recent phenomenon (i.e. developed after the formation of the planets at $\sim 1$ Myr) then the planets should have close to the stellar C/O in their atmospheres. This work lays the groundwork to better understand the disk in the PDS 70 system as well as the planet formation scenario that produce its planets.
description: 18 pages, 14 figures, 5 tables, accepted for publication in A&A
The Effect of high concentrations of the alkali chlorides on the gamma radiolysis of dilute aqueous solutions of papain
Creators: name: Hoskin, James David
Publisher: name: University of Calgary
Year: 1973
Subjects: subject: QD 601.2 H66 1973
subject: Radiochemistry
subject: Papain
subject: Gamma rays

description: Bibliography: p. 71-85.
Ten questions on Group Field Theory (and their tentative answers)
Creators: name: Baratin, Aristide
name: Oriti, Daniele
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 provide a short and non-technical summary of our current knowledge and some possible perspectives on the group field theory formalism for quantum gravity, in the form of a (partial) FAQ (with answers). Some of the questions and answers relate to aspects of the formalism that concern loop quantum gravity. This summary also aims at giving a brief, rough guide to the recent literature on group field theory (and tensor models).
description: 10 pages; contribution to the proceedings of the Loops'11 conference (CSIC, Madrid, Spain, 23-28 May 2011); to be published by Journal of Physics: Conference Series (JPCS)
From classical to quantum Oppenheimer-Snyder model: non-marginal case
Creators: name: Kiefer, Claus
name: Mohaddes, Hamid
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We first present a consistent canonical formulation of the general (non-marginal) Oppenheimer-Snyder model. The switching between comoving and stationary observer is achieved by promoting coordinate transformations between dust proper time and Schwarzschild-Killing time to canonical ones. This leads to a multivalued Hamiltonian which is deparameterizable. We then discuss the quantization of comoving and stationary observers by employing the method of Affine Coherent State Quantization (ACSQ). We thereby demonstrate that under certain conditions the quantum corrected trajectories can replace the classical singularity by a bounce. We then show that both comoving and stationary observers see this bouncing collapse behavior. We finally discuss a switching between these classes of observers at the quantum level.
description: 22 pages, 10 figures, typos corrected, references added
Extreme rotational events in a forced-damped nonlinear pendulum
Creators: name: Pal, Tapas Kumar
name: Ray, Arnob
name: Chowdhury, Sayantan Nag
name: Ghosh, Dibakar
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Since Galileo's time, the pendulum has evolved into one of the most exciting physical objects in mathematical modeling due to its vast range of applications for studying various oscillatory dynamics, including bifurcations and chaos, under various interests. This well-deserved focus aids in comprehending various oscillatory physical phenomena that can be reduced to the equations of the pendulum. The present article focuses on the rotational dynamics of the two-dimensional forced damped pendulum under the influence of the ac and dc torque. Interestingly, we are able to detect a range of the pendulum's length for which the angular velocity exhibits a few intermittent extreme rotational events that deviate significantly from a certain well-defined threshold. The statistics of the return intervals between these extreme rotational events are supported by our data to be spread exponentially. The numerical results show a sudden increase in the size of the chaotic attractor due to interior crisis which is the source of instability that is responsible for triggering large amplitude events in our system. We also notice the occurrence of phase slips with the appearance of extreme rotational events when phase difference between the instantaneous phase of the system and the externally applied ac torque is observed.
description: 10 pages, 7 figures, Comments are welcome
Effects of pressure on the kinetics of aquation of the iodopentaaquochromium (III) ion
Creators: name: Weekes, Milton Cornelius
Publisher: name: University of Calgary
Year: 1975
Subjects: subject: QD 181 C7 W44 1975 Microfiche
subject: Chromium
subject: Chemical reaction, rate of
subject: Ions
subject: Iodopentaaquochromium

description: Bibliography: p. 57-60.
Cosmological evolution of Witten superconducting string networks
Creators: name: Rybak, I. Yu.
name: Martins, C. J. A. P.
name: Peter, Patrick
name: Shellard, E. P. S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We consider the evolution of current-carrying cosmic string networks described by the charge-velocity-dependent one scale (CVOS) model beyond the linear equation of state regime, specifically focusing on the Witten superconducting model. We find that, generically, for almost chiral currents, the network evolution reduces dynamically to that of the linear case, which has been discussed in our previous work. However, the Witten model introduces a maximum critical current which constrains the network scaling behaviour during the radiation era when currents can grow and approach this limit. Unlike the linear model, only if the energy density in the critical current is comparable to the bare string tension will there be substantial backreaction on the network evolution, thus changing the observational predictions of superconducting strings from those expected from a Nambu-Goto network. During the matter era, if there are no external sources, then dynamical effects dilute these network currents and they disappear at late times.
description: 10 pages, 5 figures
A property of the derivative of an entire function
Creators: name: Bergweiler, Walter
name: Eremenko, Alexandre
Publisher: name: arXiv
Year: 2011
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30D30

description: We prove that the derivative of a non-linear entire function is unbounded on the preimage of an unbounded set.
description: 10 pages
Studies on the parasites of Pacific herring: (Clupea harengus pallasi) in North American waters
Creators: name: Arthur, J. Richard
Publisher: name: University of Calgary
Year: 1978
Subjects: subject: QL 638 C64 A76 1978 Microfiche
subject: Herring
subject: Clupeidae
subject: Parasites - Fishes

description: Bibliography: p. 165-188.
Property values and water quality: A nationwide meta-analysis and the implications for benefit transfer
Creators: name: Guignet, Dennis
name: Heberling, Matthew T.
name: Papenfus, Michael
name: Griot, Olivia
name: Holland, Ben
name: Guignet, Dennis
name: Heberling, Matthew T.
name: Papenfus, Michael
name: Griot, Olivia
name: Holland, Ben
Publisher: name: Unknown
Year: 2019
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: benefit transfer
subject: hedonic
subject: meta-analysis
subject: property value
subject: water pollution
subject: water quality

description: We conduct a meta-analysis using a comprehensive review of studies that examine the effects of water quality improvements on waterfront and non-waterfront housing values. Rather than conducting the meta-analysis using dollar values, this study estimates mean elasticity responses. We identify 36 studies that result in 656 unique observations. Mean property price elasticities with respect to numerous water quality measures are calculated (e.g., chlorophyll-a, fecal coliform, nitrogen, and phosphorous) for purposes of value transfer. In the context of water clarity, function transfers can be performed. We estimate numerous meta-regressions, and compare transfer performance across models using an out-of-sample transfer error exercise. The results suggest value transfers often perform just as well as more complicated function transfers. In our context, however, a simple function transfer that accounts for baseline water clarity performs best. We discuss the implications of these results for benefit transfer, and outline key limitations in the literature.
The swimming performance and post-swim body ion concentrations of juvenile pink salmon, and the effect of parasitic sea lice on these parameters
Creators: name: Nendick, Laura J.
Publisher: name: University of British Columbia
Year: 2009

description: Pink salmon (Oncorhynchus gorbuscha Walbaum) stocks in the Broughton Archipelago BC have seen a general decline in recent years. This is thought to be due to parasitism by sea lice, Lepeophtheirus salmonis (Krøyer, 1837), on pink salmon during early marine life stage. To investigate this, I measured swimming performance, an integrated measure of fish health, and post-swim body ion concentrations, a secondary stress response, of control and sea lice infected juvenile pink salmon (mass < 3.0 g). Using five different protocols (ranging in duration from 8 – 112 min), four constant acceleration tests (rates between 0.005 - 0.053 cm s₋²) and a repeated critical swim speed test, it was found that the final swimming speed of juvenile pink salmon (mass <5.0 g) at baseline was independent of the swim protocol (P > 0.05). Given this finding, estimates of swim performance in juvenile pink salmon can be accurately measured with an acceleration test lasting < 10 minutes. Using a repeated, constant acceleration (0.05 cm s₋²) protocol, the effects of sea lice on swimming performance and post-swim body ion concentrations were measured in artificially infected river-caught (RC-fish, mean body mass 0.3 + 0.05 g) and ocean-caught infected (OC-fish, mean body mass 1.1 + 0.1 g) juvenile pink salmon. Infection levels ranged in intensity (1 - 4 sea lice per fish) and development stage (chalimus 1 - adult). Swimming performance of RC-fish was not affected by lice intensity (P>0.05) but was affected by lice stage with swimming performance decreasing at chalimus 3 stage (-20.4%) and even further at more advanced sea lice stages (chalimus 4, -26.5%; motile, -37.9%). Sea lice parasitism had no significant effect on the swimming performance of larger OC-fish when compared to control. The absence of an additive effect on swimming performance of 1 to 3+ sea lice per fish suggests drag forces induced by the ectoparasite was not a major factor. In contrast, post-swim body Na⁺ and Cl- concentrations were typically elevated in infected compared to control RC-fish (P < 0.05), but not OC-fish (P > 0.05).
Challenges in Truncating the Hierarchy of Time-Dependent Reduced Density Matrices Equations: Open Problems
Creators: name: Akbari, Ali
name: Hashemi, Mohammad Javad
name: Nieminen, Risto M.
name: van Leeuwen, Robert
name: Rubio, Angel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work, we analyze the Born, Bogoliubov, Green, Kirkwood and Yvon (BBGKY) hierarchy of equations for describing the full time-evolution of a many-body fermionic system in terms of its reduced density matrices (at all orders). We provide an exhaustive study of the challenges and open problems linked to the truncation of such hierarchy of equations to make them practically applicable. We restrict our analysis to the coupled evolution of the one- and two-body reduced density matrices, where higher order correlation effects are embodied into the approximation used to close the equations. We prove that within this approach, the number of electrons and total energy are conserved, regardless of the employed approximation. Further, we demonstrate that although most of the truncation schemes available in the literature give acceptable ground state energy, when applied to describe driven electron dynamics exhibit undesirable and unphysical behavior, e.g., violation and even divergence in local electronic density, both in weakly- and strongly-correlated regimes. We illustrate and analyze these problems within the few-site Hubbard model. The model can be solved exactly and provides a unique reference for our detailed study of electron dynamics for different values of interaction, different initial conditions, and large set of approximations considered here. Moreover, we study the role of compatibility between two hierarchical equations, and positive- semidefiniteness of reduced density matrices in instability of electron dynamics. We show that even if the used approximation holds the compatibility, electron dynamics can still diverge when positive- definitiveness is violated. We propose some partial solutions of such problem and point the main paths for future work in order to make this approach applicable for the description of the correlated electron dynamics in complex systems.
description: 28 pages, 4 figures
Significant Phonon Drag Effect in Wide Bandgap GaN and AlN
Creators: name: Quan, Yujie
name: Chen, Yubi
name: Liao, Bolin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A thorough understanding of electrical and thermal transport properties of group-III nitride semiconductors is essential for their electronic and thermoelectric applications. Despite extensive previous studies, these transport properties were typically calculated without considering the nonequilibrium coupling effect between electrons and phonons, which can be particularly strong in group-III nitride semiconductors due to the high electric fields and high heat currents in devices based on them. In this work, we systematically examine the phonon drag effect, namely the momentum exchange between nonequilibrium phonons and electrons, and its impact on charge mobility and Seebeck coefficient in GaN and AlN by solving the fully coupled electron and phonon Boltzmann transport equations with ab initio scattering parameters. We find that, even at room temperature, the phonon drag effect can significantly enhance mobility and Seebeck coefficient in GaN and AlN, especially at higher carrier concentrations. Furthermore, we show that the phonon drag contribution to mobility and Seebeck coefficient scale differently with the carrier concentration and we highlight a surprisingly important contribution to the mobility enhancement from the polar optical phonons. We attribute both findings to the distinct mechanisms the phonon drag affects mobility and Seebeck coefficient. Our study advances the understanding of the strong phonon drag effect on carrier transport in wide bandgap GaN and AlN and gives new insights into the nature of coupled electron-phonon transport in polar semiconductors.
Finite volume treatment of pi pi scattering and limits to phase shifts extraction from lattice QCD
Creators: name: Albaladejo, M.
name: Oller, J. A.
name: Oset, E.
name: Rios, G.
name: Roca, L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study theoretically the effects of finite volume for pipi scattering in order to extract physical observables for infinite volume from lattice QCD. We compare three different approaches for pipi scattering (lowest order Bethe-Salpeter approach, N/D and inverse amplitude methods) with the aim to study the effects of the finite size of the box in the potential of the different theories, specially the left-hand cut contribution through loops in the crossed t,u-channels. We quantify the error made by neglecting these effects in usual extractions of physical observables from lattice QCD spectra. We conclude that for pipi phase-shifts in the scalar-isoscalar channel up to 800 MeV this effect is negligible for box sizes bigger than 2.5m_pi^-1 and of the order of 5% at around 1.5-2m_pi^-1. For isospin 2 the finite size effects can reach up to 10% for that energy. We also quantify the error made when using the standard Luscher method to extract physical observables from lattice QCD, which is widely used in the literature but is an approximation of the one used in the present work.
description: 10 pages, 8 figures
Digging into the Interior of Hot Cores with ALMA (DIHCA). III: The Chemical Link between NH$_{2}$CHO, HNCO, and H$_{2}$CO
Creators: name: Taniguchi, Kotomi
name: Sanhueza, Patricio
name: Olguin, Fernando A.
name: Gorai, Prasanta
name: Das, Ankan
name: Nakamura, Fumitaka
name: Saito, Masao
name: Zhang, Qizhou
name: Lu, Xing
name: Li, Shanghuo
name: Chen, Huei-Ru Vivien
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have analyzed the NH$_{2}$CHO, HNCO, H$_{2}$CO, and CH$_{3}$CN ($^{13}$CH$_{3}$CN) molecular lines at an angular resolution of $\sim 0.3''$ obtained by the Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 toward 30 high-mass star-forming regions. The NH$_{2}$CHO emission has been detected in 23 regions, while the other species have been detected toward 29 regions. A total of 44 hot molecular cores (HMCs) have been identified using the moment 0 maps of the CH$_{3}$CN line. The fractional abundances of the four species have been derived at each HMC. In order to investigate pure chemical relationships, we have conducted a partial correlation test to exclude the effect of temperature. Strong positive correlations between NH$_{2}$CHO and HNCO ($ρ=0.89$) and between NH$_{2}$CHO and H$_{2}$CO (0.84) have been found. These strong correlations indicate their direct chemical links; dual-cyclic hydrogen addition and abstraction reactions between HNCO and NH$_{2}$CHO and gas-phase formation of NH$_{2}$CHO from H$_{2}$CO. Chemical models including these reactions can reproduce the observed abundances in our target sources.
description: Accepted for The Astrophysical Journal. 27 pages, 10 tables, and 13 figures
Graphene in periodic deformation fields: dielectric screening and plasmons
Creators: name: Dugaev, V. K.
name: Katsnelson, M. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We consider the effect of periodic scalar and vector potentials generated by periodic deformations of the graphene crystal lattice, on the energy spectrum of electrons. The dependence of electron velocity near the Dirac point on the periodic perturbations of different types is discussed. We also investigated the effect of screening of the scalar potential by calculating the dielectric function as a function of the wave length of the periodic potential. This calculation shows that the periodic scalar field is strongly suppressed by the screening. Using the dependence of electron velocity on the periodic field we also studied the variation of the plasmon spectra in graphene. We found that the spectrum of plasmon excitations can be effectively controlled by the periodic strain field.
description: 9 pages, 6 figures
The Effect of Superpositions on the Planetary Nebula Luminosity Function
Creators: name: Chase, Owen
name: Ciardullo, Robin
name: Roth, Martin
name: Jacoby, George
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Planetary nebula (PN) surveys in systems beyond ~10 Mpc often find high-excitation, point-like sources with [O III] $λ5007$ fluxes greater than the apparent bright-end cutoff of the planetary nebula luminosity function (PNLF). Here we identify PN superpositions as one likely cause for the phenomenon and describe the proper procedures for deriving PNLF distances when object blends are a possibility. We apply our technique to two objects: a model Virgo-distance elliptical galaxy observed through a narrow-band interference filter, and the Fornax lenticular galaxy NGC 1380 surveyed with the MUSE integral-field unit spectrograph. Our analyses show that even when the most-likely distance to a galaxy is unaffected by the possible presence of PN superpositions, the resultant value will still be biased towards too small a distance due to the asymmetrical nature of the error bars. We discuss the future of the PNLF in an era where current ground-based instrumentation can push the technique to distances beyond ~35 Mpc.
Symmetry breaking and superfluid currents in a split-ring spinor polariton condensate
Creators: name: Chestnov, Igor
name: Kondratenko, Kirill
name: Demirchyan, Sevak
name: Kavokin, Alexey
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Bosonic condensates of spin-less non-interacting particles confined on a ring cannot propagate circular periodic currents once rotation symmetry of the system is broken. However a persistent current may appear due to inter-particle interactions exceeding some critical strength. In this up-critical regime breaking of the symmetry between the clockwise and anticlockwise rotations takes place. We consider this symmetry-breaking scenario in the case of a spinor condensate of exciton polaritons trapped on a ring split by a potential barrier. Due to the intrinsic symmetry of the effective spin-orbit interaction which stems from the linear splitting between transverse-electric and transverse-magnetic microcavity modes, the potential barrier blocks the circulating current and imposes linear polarization patterns. On the other hand, circularly polarized polaritons form circular currents propagating in opposite directions with equal absolute values of angular momentum. In the presence of inter-particle interactions, the symmetry of clockwise and anticlockwise currents can be broken spontaneously. We describe several symmetry-breaking scenarios which imply either restoration of the global condensate rotation or the onset of the circular polarization in the symmetry-broken state.
description: 9 pages, 5 figures
Effects of sympathomimetic amines on blood pressure and heart rate in the chronically cannulated fetal lamb, the newborn lamb and the adult sheep
Creators: name: Harris, William H.
Publisher: name: University of Calgary
Year: 1976
Subjects: subject: RM 300 H35 1976 Microfiche
subject: Drugs - Physiological effect
subject: Cardiovascular system

description: Bibliography: p. 175-187.
Lack of Correlations between Cold Molecular Gas and AGN Properties in Type 1 AGNs at $z \lesssim 0.5$
Creators: name: Molina, Juan
name: Shangguan, Jinyi
name: Wang, Ran
name: Ho, Luis C.
name: Bauer, Franz E.
name: Treister, Ezequiel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new NOrthern Extended Millimeter Array (NOEMA) observations of the CO(2--1) emission in eight of the brightest Palomar-Green quasars at $z \lesssim 0.5$ to investigate the role of active galactic nuclei (AGN) feedback in luminous quasars detected at low redshifts. We detect CO(2--1) emission in three objects, from which we derive CO luminosities, molecular gas masses and fractions, and gas depletion times. In combination with data available in the literature, we build a total sample of 138 local type 1 AGNs with CO(2--1) measurements. We compare the AGN properties with the host galaxy molecular gas properties, considering the systems non-detected in CO emission. We find that the CO luminosity does not correlate with AGN luminosity and Eddington ratio, while the molecular gas fraction is weakly correlated with Eddington ratio. The type 1 AGNs can be roughly separated into two populations in terms of infrared-to-CO luminosity ratio, one population presenting values typically found in normal star-forming systems, while the other have lower ratio values, comparable to those measured for starbursts. We find no evidence that AGN feedback rapidly quenches star formation in type 1 AGNs. Our results may imply an underlying the role of host galaxy gravitational instabilities or the fast inflow of cold gas in triggering AGN activity.
description: 20 pages, 9 figures, 4 tables. Accepted for publication in ApJ
Controlled wave-packet manipulation with driven optical lattices
Creators: name: Arlinghaus, Stephan
name: Holthaus, Martin
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Motivated by recent experimental progress achieved with ultracold atoms in kilohertz-driven optical lattices, we provide a theoretical discussion of mechanisms governing the response of a particle in a cosine lattice potential to strong forcing pulses with smooth envelope. Such pulses effectuate adiabatic motion of a wave packet's momentum distribution on quasienergy surfaces created by spatiotemporal Bloch waves. Deviations from adiabaticity can then deliberately be exploited for exerting coherent control and for reaching target states which may not be accessible by other means. As one particular example, we consider an analog of the π-pulses known from optical resonance. We also suggest adapting further techniques previously developed for controlling atomic and molecular dynamics by laser pulses to the coherent control of matter waves in shaken optical lattices.
description: 11 pages, 10 figures
Planning study for a national nature preserve along the South Saskatchewan River, Suffield Area, Alberta
Creators: name: Norbeck, Carl Sterling
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: S 954 C34 N65 1972
subject: Conservation of natural resources - Alberta
subject: Parks, National - Canada - Suffield area (Proposed)
subject: Parks, National - Canada - Wawaskesy (Proposed)

description: Bibliography: p. 111-119.
Numerical Investigation of Airborne Infection Risk in an Elevator Cabin under Different Ventilation Designs
Creators: name: Nazari, Ata
name: Wang, Changchang
name: He, Ruichen
name: Taghizadeh-Hesary, Farzad
name: Hong, Jiarong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Systems and Control (eess.SY)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Airborne transmission of SARS-CoV-2 via virus-laden aerosols in enclosed spaces poses a significant concern. Elevators, commonly utilized enclosed spaces in modern tall buildings, present a challenge as the impact of varying heating, ventilation, and air conditioning (HVAC) systems on virus transmission within these cabins remains unclear. In this study, we employ computational modeling to examine aerosol transmission within an elevator cabin outfitted with diverse HVAC systems. Using a transport equation, we model aerosol concentration and assess infection risk distribution across passengers' breathing zones. We calculate particle removal efficiency for each HVAC design and introduce a suppression effect criterion to evaluate the effectiveness of the HVAC systems. Our findings reveal that mixing ventilation, featuring both inlet and outlet at the ceiling, proves most efficient in reducing particle spread, achieving a maximum removal efficiency of 79.40% during the exposure time. Conversely, the stratum ventilation model attains a mere removal efficiency of 3.97%. These results underscore the importance of careful HVAC system selection in mitigating the risk of SARS-CoV-2 transmission within elevator cabins.
description: 38 pages, 14 figures
Natural Hazards and Disasters Resilient Design: Coastal Dynamics Design Lab
Creators: name: Fox, Andy
Publisher: name: Zenodo
Year: 2021
Subjects: subject: climate
subject: climate change
subject: resilience
subject: community engagement
subject: https://zenodo.org/search?page=1&size=20&q=subject.term:%22Climate%20Change%22
subject: https://zenodo.org/search?page=1&size=20&q=subject.term:%22climate%20change%22

description: Fox, co-director of the NC State Coastal Dynamics Design Lab, was a panelist on the Natural Hazards and Disasters Resilient Design Panel and summarized the role of the lab to lead transdiciplinary design teams to address ecological and community development challenges within vulnerable coastal communities and regions.
Mid-infrared variability of the binary system CS Cha
Creators: name: Nagel, Erick
name: Espaillat, Catherine
name: D'Alessio, Paola
name: Calvet, Nuria
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: CS Cha is a binary system surrounded by a circumbinary disk. We construct a model for the inner disk regions and compare the resulting synthetic SED with IRS spectra of CS Cha taken at two different epochs. For our model we adopt a non-axisymmetric mass distribution from results of published numerical simulations of the interaction between a circumbinary disk and a binary system, where each star is surrounded by a disk. In particular, we approximate the streams of mass from which the inner circumstellar disks accrete from the circumbinary disk. This structure is due to the gravitational interaction of the stars with the disk, in which an array of disks and streams are formed in an inner hole. We calculate the temperature distribution of the optically thin dust in these inner regions considering the variable impinging radiation from both stars and use the observations to estimate the mass variations in the streams. We find that the SEDs for both epochs can be explained with emission from an optically thick inner edge of the circumbinary disk and from the optically thin streams that connect the circumbinary disk with the two smaller circumstellar disks. To the best of our knowledge, this is the first time that the emission from the optically thin material in the hole, suggested by the theory, is tested against observations of a binary system.
description: 32 pages, 9 figures, 3 tables, accepted for publication in the Astrophysical Journal
Denoising Diffusion Probabilistic Models to Predict the Density of Molecular Clouds
Creators: name: Xu, Duo
name: Tan, Jonathan C.
name: Hsu, Chia-Jung
name: Zhu, Ye
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We introduce the state-of-the-art deep learning Denoising Diffusion Probabilistic Model (DDPM) as a method to infer the volume or number density of giant molecular clouds (GMCs) from projected mass surface density maps. We adopt magnetohydrodynamic simulations with different global magnetic field strengths and large-scale dynamics, i.e., noncolliding and colliding GMCs. We train a diffusion model on both mass surface density maps and their corresponding mass-weighted number density maps from different viewing angles for all the simulations. We compare the diffusion model performance with a more traditional empirical two-component and three-component power-law fitting method and with a more traditional neural network machine learning approach (CASI-2D). We conclude that the diffusion model achieves an order of magnitude improvement on the accuracy of predicting number density compared to that by other methods. We apply the diffusion method to some example astronomical column density maps of Taurus and the Infrared Dark Clouds (IRDCs) G28.37+0.07 and G35.39-0.33 to produce maps of their mean volume densities.
description: ApJ accepted
Real-time B-mode ultrasound image simulation and artifacts modelling of needles and brachytherapy seeds
Creators: name: Zhu, Mengchen
Publisher: name: University of British Columbia
Year: 2009

description: The training of ultrasound guided interventional procedures could benefit from ultrasound simulators that synthesize realistic-looking B-mode images of tissue and interventional tools, such as the needle. For a prostate brachytherapy simulator in particular, both the needle and seed images need to be synthesized. In this thesis, we propose an interpolation-based method for simulating needle and seed B-mode images in real time. We parametrize a needle or a seed B-mode image as a function of its position and orientation. We collect needle and seed images under various spatial configurations in a water-tank using a needle guidance robot. Then we use multi-dimensional tensor-product interpolation to simulate images of needles and seeds with arbitrary poses and positions using collected images. After further processing, the interpolated needle and seed images are superimposed on top of phantom or tissue image backgrounds. The similarity between the simulated and the real images is measured using a correlation metric. The results are also compared to in vivo images. Images in both the transverse and the sagittal planes are simulated. Artifacts associated with the needle and seed are studied in detail by experiments and by physical models. It is demonstrated that the bright band pattern associated with the sagittal needle images could be interpreted using a plate reflection model; the bright tails associated with the transverse needle images could be analyzed by simulating the back-scattered stress field from a sphere.
Constraining the Symmetry Term in the Nuclear Equation of State at Sub-Saturation Densities and Finite Temperatures
Creators: name: Marini, P.
name: Bonasera, A.
name: McIntosh, A.
name: Tripathi, R.
name: Galanopoulos, S.
name: Hagel, K.
name: Heilborn, L.
name: Kohley, Z.
name: May, L. W.
name: Mehlman, M.
name: Soisson, S. N.
name: Souliotis, G. A.
name: Shetty, D. V.
name: Smith, W. B.
name: Stein, B. C.
name: Wuenschel, S.
name: Yennello, S. J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Methods of extraction of the symmetry energy (or enthalpy) coefficient to temperature ratio from isobaric and isotopic yields of fragments produced in Fermi-energy heavy-ion collisions are discussed. We show that the methods are consistent when the hot fragmenting source is well characterized and its excitation energy and isotopic composition are properly taken into account. The results are independent of the mass number of the detected fragments, which suggests that their fate is decided very early in the reaction.
description: 12 pages, 9 figures, submitted to Phys. Rev. C and accepted for publication
Running boundary actions, Asymptotic Safety, and black hole thermodynamics
Creators: name: Becker, D.
name: Reuter, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Previous explorations of the Asymptotic Safety scenario in Quantum Einstein Gravity (QEG) by means of the effective average action and its associated functional renormalization group (RG) equation assumed spacetime manifolds which have no boundaries. Here we take a first step towards a generalization for non-trivial boundaries, restricting ourselves to action functionals which are at most of second order in the derivatives acting on the metric. We analyze two examples of truncated actions with running boundary terms: full fledged QEG within the single-metric Einstein-Hilbert (EH) truncation, augmented by a scale dependent Gibbons-Hawking (GH) surface term, and a bi-metric truncation for gravity coupled to scalar matter fields. The latter contains 17 running couplings, related to both bulk and boundary terms, whose beta-functions are computed in the induced gravity approximation. We find that the bulk and the boundary Newton constant, pertaining to the EH and GH term, respectively, show opposite RG running; proposing a scale dependent variant of the ADM mass we argue that the running of both couplings is consistent with gravitational anti-screening. We describe a simple device for counting the number of field modes integrated out between the infrared cutoff scale and the ultraviolet. This method makes it manifest that, in an asymptotically safe theory, there are effectively no field modes integrated out while the RG trajectory stays in the scaling regime of the underlying fixed point. As an application, we investigate how the semiclassical theory of Black Hole Thermodynamics gets modified by quantum gravity effects and compare the new picture to older work on `RG-improved black holes' which incorporated the running of the bulk Newton constant only. We find, for instance, that the black hole's entropy vanishes and its specific heat capacity turns positive at Planckian scales.
description: 65 pages, 2 figures
The ALMA Survey of 70 $μ$m Dark High-mass Clumps in Early Stages (ASHES). IX. Physical Properties and Spatial Distribution of Cores in IRDCs
Creators: name: Morii, Kaho
name: Sanhueza, Patricio
name: Nakamura, Fumitaka
name: Zhang, Qizhou
name: Sabatini, Giovanni
name: Beuther, Henrik
name: Lu, Xing
name: Li, Shanghuo
name: Garay, Guido
name: Jackson, James M.
name: Olguin, Fernando A.
name: Tafoya, Daniel
name: Tatematsu, Ken'ichi
name: Izumi, Natsuko
name: Sakai, Takeshi
name: Silva, Andrea
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The initial conditions found in infrared dark clouds (IRDCs) provide insights on how high-mass stars and stellar clusters form. We have conducted high-angular resolution and high-sensitivity observations toward thirty-nine massive IRDC clumps, which have been mosaicked using the 12m and 7m arrays from the Atacama Large Millimeter/submillimeter Array (ALMA). The targets are 70 $μ$m dark massive (220-4900 $M_\odot$), dense ($>$10$^4$ cm$^{-3}$), and cold ($\sim$10-20K) clumps located at distances between 2 and 6 kpc. We identify an unprecedented number of 839 cores, with masses between 0.05 and 81 $M_\odot$ using 1.3 mm dust continuum emission. About 55% of the cores are low-mass ($<$1 $M_\odot$), whereas $\lesssim$1% (7/839) are high-mass ($\gtrsim$27 $M_\odot$). We detect no high-mass prestellar cores. The most massive cores (MMC) identified within individual clumps lack sufficient mass to form high-mass stars without additional mass feeding. We find that the mass of the MMCs is correlated with the clump surface density, implying denser clumps produce more massive cores and a larger number of cores. There is no significant mass segregation except for a few tentative detections. In contrast, most clumps show segregation once the clump density is considered instead of mass. Although the dust continuum emission resolves clumps in a network of filaments, some of which consist of hub-filament systems, the majority of the MMCs are not found in the hubs. Our analysis shows that high-mass cores and MMCs have no preferred location with respect to low-mass cores at the earliest stages of high-mass star formation.
description: Accepted for Publication in ApJ. 54 pages, 40 figures, 5 tables
Angular momentum transfer between oscillations and rotation in subdwarf B hybrid pulsators
Creators: name: Hernández, Fernando Pérez
name: Oreiro, Raquel
name: Hu, Haili
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Subdwarf B pulsators exhibit pressure (p) and/or gravity (g) modes. Their frequency spectra range from very simple, with few frequencies, to very rich, with more than fifty peaks in some cases. Balloon09 is a hybrid pulsating subdwarf B, showing a large number of p- and g-modes including a triplet and a quintuplet-like structures which are interpreted as p-mode frequency splittings due to stellar rotation. Photometric observations undertaken in two subsequent years revealed a change in these rotational splittings of 0.24 - 0.58 μHz/yr. Aims. We analyse the possibility of angular momentum interchange between stellar rotation and internal gravity waves as a mechanism for the observed rotational splitting variations. Methods. The expected change in the rotational splitting of eigenmodes resulting from this mechanism are computed in the nonadiabatic linear approximation for a stellar structure model that is representative of the target star. The fact that g-modes are also observed in Balloon09 makes it a particularly suitable candidate for our study, because the change in the rotational splittings are proportional to the amplitude squared of the g-modes which, in this case, can be estimated from the observations. Results. We find that this mechanism is able to predict changes in the splittings that can be of the same order of magnitude as the observed variations.
description: 10 pages, 13 figures
Socialist pricing controversy in retrospect: a critique of the Mises-Lange debate
Creators: name: Morse, David Ronald Anthony
Publisher: name: University of Calgary
Year: 1971
Subjects: subject: HB 97.5 M65 1971 Microfilm
subject: Marxian economics
subject: Mises, Ludwig von, 1881-1973
subject: Lange, Oscar Richard, 1904-

description: Bibliography: p. 205-213.
ARPES signatures of few-layer twistronic graphenes
Creators: name: Nunn, J. E.
name: McEllistrim, A.
name: Weston, A.
name: Garcia-Ruiz, A.
name: Watson, M. D.
name: Mucha-Kruczynski, M.
name: Cacho, C.
name: Gorbachev, R.
name: Fal'ko, V. I.
name: Wilson, N. R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Diverse emergent correlated electron phenomena have been observed in twisted graphene layers due to electronic interactions with the moiré superlattice potential. Many electronic structure predictions have been reported exploring this new field, but with few momentum-resolved electronic structure measurements to test them. Here we use angle-resolved photoemission spectroscopy (ARPES) to study the twist-dependent ($1^\circ < θ< 8^\circ$) electronic band structure of few-layer graphenes, including twisted bilayer, monolayer-on-bilayer, and double-bilayer graphene (tDBG). Direct comparison is made between experiment and theory, using a hybrid $\textbf{k}\cdot\textbf{p}$ model for interlayer coupling and implementing photon-energy-dependent phase shifts for photo-electrons from consecutive layers to simulate ARPES spectra. Quantitative agreement between experiment and theory is found across twist angles, stacking geometries, and back-gate voltages, validating the models and revealing displacement field induced gap openings in twisted graphenes. However, for tDBG at $θ=1.5\pm0.2^\circ$, close to the predicted magic-angle of $θ=1.3^\circ$, a flat band is found near the Fermi-level with measured bandwidth of $E_w = 31\pm5$ meV. Analysis of the gap between the flat band and the next valence band shows significant deviations between experiment ($Δ_h=46\pm5$meV) and the theoretical model ($Δ_h=5$meV), indicative of the importance of lattice relaxation in this regime.
ВОСПИТАНИЕ КАК СОЦИАЛЬНОЕ ЯВЛЕНИЕ ДЕТЕЙ ДОШКОЛЬНОГО ВОЗРАСТА
Creators: name: Хужаназарова, Наргиза
name: Базарова, Рухшона
name: Хамидова, Марджона
Publisher: name: Zenodo
Year: 2023

description: В статье представлены некоторые вопросы организации систематического, базирующегося на знании и учете объективных закономерностей развития личности процесса воспитания, который служит необходимой и всеобщей формой этого развития.
An Exploratory study of bibliotherapy conducted in an elementary school library
Creators: name: Nielsen, Beatrice Folsom
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: BF 723 S3 N52 1972 Microfilm
subject: Self-respect
subject: Self-actualization (Psychology)
subject: Bibliotherapy
subject: School libraries

description: Bibliographies: p. 101-105, 114, 118.