cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The valence quark, sea, and gluon content of the pion from the parton distribution functions and the electromagnetic form factor
Creators: name: Pasquini, Barbara
name: Rodini, Simone
name: Venturini, Simone
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present a light-front model calculation of the pion parton distribution functions (PDFs) and the pion electromagnetic form factor. The pion state is modeled in terms of light-front wave functions (LFWFs) for the $q\bar q$, $q\bar q q\bar q$, $q\bar q g$, and $q\bar q gg$ components. We design the LFWFs so that the parameters in the longitudinal and transverse momentum space enter separately in the fit of the pion PDFs and the electromagnetic form factor, respectively. We extract the pion PDFs within the xFitter framework using available Drell-Yan and photon-production data. With the obtained parameters in the longitudinal-momentum space, we then fit the available experimental data on the pion electromagnetic form factor to constrain the remaining parameters in the transverse-momentum space. The results for the pion PDFs are compatible with existing extractions and lattice calculations, and the fit to the pion electromagnetic form factor data works quite successfully. The obtained parametrization for the LFWFs marks a step forward towards a unified description of different hadron distribution functions in both the longitudinal- and transverse-momentum space and will be further applied to a phenomenological study of transverse-momentum dependent parton distribution functions and generalized parton distributions.
description: 18 pages, 3 figures; typos corrected, one reference added and discussion of the model extended; version to appear in Phys. Rev. D
Imaging the heart of astrophysical objects with optical long-baseline interferometry
Creators: name: Berger, J. -P.
name: Malbet, F.
name: Baron, F.
name: Chiavassa, A.
name: Duvert, G.
name: Elitzur, M.
name: Freytag, B.
name: Gueth, F.
name: Hönig, S.
name: Hron, J.
name: Jang-Condell, H.
name: Bouquin, J. -B. Le
name: Monin, J. -L
name: Monnier, J. D.
name: Perrin, G.
name: Plez, B.
name: Ratzka, T.
name: Renard, S.
name: Stefl, S.
name: Thiébaut, E.
name: Tristram, K.
name: Verhoelst, T.
name: Wolf, S.
name: Young, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The number of publications of aperture-synthesis images based on optical long-baseline interferometry measurements has recently increased due to easier access to visible and infrared interferometers. The interferometry technique has now reached a technical maturity level that opens new avenues for numerous astrophysical topics requiring milli-arcsecond model-independent imaging. In writing this paper our motivation was twofold: 1) review and publicize emblematic excerpts of the impressive corpus accumulated in the field of optical interferometry image reconstruction; 2) discuss future prospects for this technique by selecting four representative astrophysical science cases in order to review the potential benefits of using optical long baseline interferometers. For this second goal we have simulated interferometric data from those selected astrophysical environments and used state-of-the-art codes to provide the reconstructed images that are reachable with current or soon-to-be facilities. The image reconstruction process was "blind" in the sense that reconstructors had no knowledge of the input brightness distributions. We discuss the impact of optical interferometry in those four astrophysical fields. We show that image reconstruction software successfully provides accurate morphological information on a variety of astrophysical topics and review the current strengths and weaknesses of such reconstructions. We investigate how to improve image reconstruction and the quality of the image possibly by upgrading the current facilities. We finally argue that optical interferometers and their corresponding instrumentation, existing or to come, with 6 to 10 telescopes, should be well suited to provide images of complex sceneries.
description: Acccepted to Astronomy and Astrophysics Review
Controlled rotation of electrically injected spins in a non-ballistic spin field-effect transistor
Creators: name: Eberle, Franz
name: Schuh, Dieter
name: Grünewald, Benedikt
name: Bougeard, Dominique
name: Weiss, Dieter
name: Ciorga, Mariusz
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electrically controlled rotation of spins in a semiconducting channel is a prerequisite for the successful realization of many spintronic devices, like, e.g., the spin field effect transistor (sFET). To date, there have been only a few reports on electrically controlled spin precession in sFET-like devices. These devices operated in the ballistic regime, as postulated in the original sFET proposal, and hence need high SOC channel materials in practice. Here, we demonstrate gate-controlled precession of spins in a non-ballistic sFET using an array of narrow diffusive wires as a channel between a spin source and a spin drain. Our study shows that spins traveling in a semiconducting channel can be coherently rotated on a distance far exceeding the electrons mean free path, and spin-transistor functionality can be thus achieved in non-ballistic channels with relatively low SOC, relaxing two major constraints of the original sFET proposal.
description: Main text: 21 pages, 4 figures. Supplementary Information:11 pages, 4 figures
Liquid methane at extreme temperature and pressure: Implications for models of Uranus and Neptune
Creators: name: Richters, Dorothee
name: Kühne, Thomas D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present large scale electronic structure based molecular dynamics simulations of liquid methane at planetary conditions. In particular, we address the controversy of whether or not the interior of Uranus and Neptune consists of diamond. In our simulations we find no evidence for the formation of diamond, but rather sp2-bonded polymeric carbon. Furthermore, we predict that at high tem- perature hydrogen may exist in its monoatomic and metallic state. The implications of our finding for the planetary models of Uranus and Neptune are in detail discussed.
description: 4 pages, 3 figures
The settlement of Madagascar: what dialects and languages can tell
Creators: name: Serva, Maurizio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computation and Language (cs.CL)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: The dialects of Madagascar belong to the Greater Barito East group of the Austronesian family and it is widely accepted that the Island was colonized by Indonesian sailors after a maritime trek which probably took place around 650 CE. The language most closely related to Malagasy dialects is Maanyan but also Malay is strongly related especially for what concerns navigation terms. Since the Maanyan Dayaks live along the Barito river in Kalimantan (Borneo) and they do not possess the necessary skill for long maritime navigation, probably they were brought as subordinates by Malay sailors. In a recent paper we compared 23 different Malagasy dialects in order to determine the time and the landing area of the first colonization. In this research we use new data and new methods to confirm that the landing took place on the south-east coast of the Island. Furthermore, we are able to state here that it is unlikely that there were multiple settlements and, therefore, colonization consisted in a single founding event. To reach our goal we find out the internal kinship relations among all the 23 Malagasy dialects and we also find out the different kinship degrees of the 23 dialects versus Malay and Maanyan. The method used is an automated version of the lexicostatistic approach. The data concerning Madagascar were collected by the author at the beginning of 2010 and consist of Swadesh lists of 200 items for 23 dialects covering all areas of the Island. The lists for Maanyan and Malay were obtained from published datasets integrated by author's interviews.
description: We find out the area and the modalities of the settlement of Madagascar by Indonesian colonizers around 650 CE. Results are obtained comparing 23 Malagasy dialects with Malay and Maanyan languages
Upper bound of a band complex
Creators: name: Li, Si
name: Zhang, Zeying
name: Feng, Xukun
name: Wu, Weikang
name: Yu, Zhi-Ming
name: Zhao, Y. X.
name: Yao, Yugui
name: Yang, Shengyuan A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Band structure for a crystal generally consists of connected components in energy-momentum space, known as band complexes. Here, we explore a fundamental aspect regarding the maximal number of bands that can be accommodated in a single band complex. We show that in principle a band complex can have no finite upper bound for certain space groups. It means infinitely many bands can entangle together, forming a connected pattern stable against symmetry-preserving perturbations. This is demonstrated by our developed inductive construction procedure, through which a given band complex can always be grown into a larger one by gluing a basic building block to it. As a by-product, we demonstrate the existence of arbitrarily large accordion type band structures containing $N_C=4n$ bands, with $n\in\mathbb{N}$.
description: 6 pages, 4 figures
Local well-posedness for Euler-Poisson fluids with non-zero heat conduction
Creators: name: Xu, Jiang
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35M10, 35Q35, 76X05

description: We consider the multidimensional Euler-Poisson equations with non-zero heat conduction, which consist of a coupled hyperbolic-parabolic-elliptic system of balance laws. We make a deep analysis on the coupling effects and establish a local well-posedness of classical solutions to the Cauchy problem pertaining to data in the critical Besov space. Proof mainly relies on a standard iteration argument. To achieve it, a new Moser-type inequality is developed by the Bony' decomposition.
Black Hole Photon Rings Beyond General Relativity
Creators: name: Staelens, Seppe
name: Mayerson, Daniel R.
name: Bacchini, Fabio
name: Ripperda, Bart
name: Küchler, Lorenzo
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate whether photon ring observations in black hole imaging are able to distinguish between the Kerr black hole in general relativity and alternative black holes that deviate from Kerr. Certain aspects of photon rings have been argued to be robust observables in Very-Long-Baseline Interferometry (VLBI) black hole observations which carry imprints of the underlying spacetime. The photon ring shape, as well as its Lyapunov exponent (which encodes the narrowing of successive photon subrings), are detailed probes of the underlying geometry; measurements thereof have been argued to provide a strong null test of general relativity and the Kerr metric. However, a more complicated question is whether such observations of the photon ring properties can distinguish between Kerr and alternative black holes. We provide a first answer to this question by calculating photon rings of the Johannsen, Rasheed-Larsen, and Manko-Novikov black holes. We find that large deviations from Kerr and large observer inclinations are needed to obtain measurable differences in the photon ring shape. In other words, the Kerr photon ring shape appears to be the universal shape even for deviating black holes at low inclinations. On the other hand, the Lyapunov exponent shows more marked variations for deviations from the Kerr metric. Our analysis lays out the groundwork to determine deviations from the Kerr spacetime in photon rings that are potentially detectable by future observing missions.
description: 31 pages + appendices; 20 figures
The Atacama Cosmology Telescope: High-Resolution Sunyaev-Zel'dovich Array Observations of ACT SZE-selected Clusters from the Equatorial Strip
Creators: name: Reese, Erik D.
name: Mroczkowski, Tony
name: Menanteau, Felipe
name: Hilton, Matt
name: Sievers, Jonathan
name: Aguirre, Paula
name: Appel, John William
name: Baker, Andrew J.
name: Bond, J. Richard
name: Das, Sudeep
name: Devlin, Mark J.
name: Dicker, Simon R.
name: Dunner, Rolando
name: Essinger-Hileman, Thomas
name: Fowler, Joseph W.
name: Hajian, Amir
name: Halpern, Mark
name: Hasselfield, Matthew
name: Hill, J. Colin
name: Hincks, Adam D.
name: Huffenberger, Kevin M.
name: Hughes, John P.
name: Irwin, Kent D.
name: Klein, Jeff
name: Kosowsky, Arthur
name: Lin, Yen-Ting
name: Marriage, Tobias A.
name: Marsden, Danica
name: Moodley, Kavilan
name: Niemack, Michael D.
name: Nolta, Michael R.
name: Page, Lyman A.
name: Parker, Lucas
name: Partridge, Bruce
name: Rojas, Felipe
name: Sehgal, Neelima
name: Sifon, Cristobal
name: Spergel, David N.
name: Staggs, Suzanne T.
name: Swetz, Daniel S.
name: Switzer, Eric R.
name: Thornton, Robert
name: Trac, Hy
name: Wollack, Edward J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present follow-up observations with the Sunyaev-Zel'dovich Array (SZA) of optically-confirmed galaxy clusters found in the equatorial survey region of the Atacama Cosmology Telescope (ACT): ACT-CL J0022-0036, ACT-CL J2051+0057, and ACT-CL J2337+0016. ACT-CL J0022-0036 is a newly-discovered, massive (10^15 Msun), high-redshift (z=0.81) cluster revealed by ACT through the Sunyaev-Zel'dovich effect (SZE). Deep, targeted observations with the SZA allow us to probe a broader range of cluster spatial scales, better disentangle cluster decrements from radio point source emission, and derive more robust integrated SZE flux and mass estimates than we can with ACT data alone. For the two clusters we detect with the SZA we compute integrated SZE signal and derive masses from the SZA data only. ACT-CL J2337+0016, also known as Abell 2631, has archival Chandra data that allow an additional X-ray-based mass estimate. Optical richness is also used to estimate cluster masses and shows good agreement with the SZE and X-ray-based estimates. Based on the point sources detected by the SZA in these three cluster fields and an extrapolation to ACT's frequency, we estimate that point sources could be contaminating the SZE decrement at the <= 20% level for some fraction of clusters.
description: 12 pages, 5 figures, 7 tables; submitted to ApJ
Das Neuenbürger Erzrevier im Nordschwarzwald als Wirtschaftsraum während der Späthallstatt- und Frühlatènezeit
Creators: name: Gassmann, Guntram
name: Rösch, Manfred
name: Wieland, Günther
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2020

description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 84 Nr. 2 (2006)
The Effects of fimbria transection on maternal behavior in the rat
Creators: name: Terlecki, Lori J.
Publisher: name: University of Calgary
Year: 1977
Subjects: subject: QP 381 T46 1977 Fiche
subject: Rats - Behavior
subject: Hippocampus (Brain)
subject: Psychology, Physiological

description: Bibliography: p. 79-84.
Theory of the low- and high-field superconducting phases of UTe$_2$
Creators: name: Yu, Josephine J.
name: Yu, Yue
name: Agterberg, Daniel F.
name: Raghu, Srinivas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Recent nuclear magnetic resonance (NMR) and calorimetric experiments have observed that UTe$_2$ exhibits a transition between two distinct superconducting phases as a function of magnetic field strength for a field applied along the crystalline $b$-axis. To determine the nature of these phases, we employ a microscopic two-band minimal Hamiltonian with the essential crystal symmetries and structural details. We also adopt anisotropic ferromagnetic exchange terms. We study the resulting pairing symmetries and properties of these low- and high-field phases in mean field theory.
YSE-PZ: A Transient Survey Management Platform that Empowers the Human-in-the-Loop
Creators: name: Coulter, D. A.
name: Jones, D. O.
name: McGill, P.
name: Foley, R. J.
name: Aleo, P. D.
name: Bustamante-Rosell, M. J.
name: Chatterjee, D.
name: Davis, K. W.
name: Dickinson, C.
name: Engel, A.
name: Gagliano, A.
name: Jacobson-Galán, W. V.
name: Kilpatrick, C. D.
name: Kutcka, J.
name: Saux, X. K. Le
name: Pan, Y. -C.
name: Quiñonez, P. J.
name: Rojas-Bravo, C.
name: Siebert, M. R.
name: Taggart, K.
name: Tinyanont, S.
name: Wang, Q.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The modern study of astrophysical transients has been transformed by an exponentially growing volume of data. Within the last decade, the transient discovery rate has increased by a factor of ~20, with associated survey data, archival data, and metadata also increasing with the number of discoveries. To manage the data at this increased rate, we require new tools. Here we present YSE-PZ, a transient survey management platform that ingests multiple live streams of transient discovery alerts, identifies the host galaxies of those transients, downloads coincident archival data, and retrieves photometry and spectra from ongoing surveys. YSE-PZ also presents a user with a range of tools to make and support timely and informed transient follow-up decisions. Those subsequent observations enhance transient science and can reveal physics only accessible with rapid follow-up observations. Rather than automating out human interaction, YSE-PZ focuses on accelerating and enhancing human decision making, a role we describe as empowering the human-in-the-loop. Finally, YSE-PZ is built to be flexibly used and deployed; YSE-PZ can support multiple, simultaneous, and independent transient collaborations through group-level data permissions, allowing a user to view the data associated with the union of all groups in which they are a member. YSE-PZ can be used as a local instance installed via Docker or deployed as a service hosted in the cloud. We provide YSE-PZ as an open-source tool for the community.
description: 23 pages, 9 figures, submitted to PASP
First evidence of pep solar neutrinos by direct detection in Borexino
Creators: name: The Borexino Collaboration
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We observed, for the first time, solar neutrinos in the 1.0-1.5 MeV energy range. We measured the rate of pep solar neutrino interactions in Borexino to be [3.1+-0.6(stat)+-0.3(syst)] counts/(day x 100 ton) and provided a constraint on the CNO solar neutrino interaction rate of <7.9 counts/(day x 100 ton) (95% C.L.). The absence of the solar neutrino signal is disfavored at 99.97% C.L., while the absence of the pep signal is disfavored at 98% C.L. This unprecedented sensitivity was achieved by adopting novel data analysis techniques for the rejection of cosmogenic 11C, the dominant background in the 1-2 MeV region. Assuming the MSW-LMA solution to solar neutrino oscillations, these values correspond to solar neutrino fluxes of [1.6+-0.3]x10^8 cm^-2s-1 and 7.7x10^8 cm^-2s-1 (95% C.L.), respectively, in agreement with the Standard Solar Model. These results represent the first measurement of the pep neutrino flux and the strongest constraint of the CNO solar neutrino flux to date.
description: Submitted to Physical Review Letters (2011)
Die Eroberung der Etschklausen 101 v.Chr. durch einen kimbrischen Sturmtrupp
Creators: name: Sadée, Emil
Publisher: name: Bonner Jahrbücher
Year: 2020

description: Bonner Jahrbücher, Bd. 143/144 (1938): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Diffusion in a logarithmic potential: scaling and selection in the approach to equilibrium
Creators: name: Hirschberg, Ori
name: Mukamel, David
name: Schütz, Gunter M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The equation which describes a particle diffusing in a logarithmic potential arises in diverse physical problems such as momentum diffusion of atoms in optical traps, condensation processes, and denaturation of DNA molecules. A detailed study of the approach of such systems to equilibrium via a scaling analysis is carried out, revealing three surprising features: (i) the solution is given by two distinct scaling forms, corresponding to a diffusive (x ~ \sqrt{t}) and a subdiffusive (x >> \sqrt{t}) length scales, respectively; (ii) the scaling exponents and scaling functions corresponding to both regimes are selected by the initial condition; and (iii) this dependence on the initial condition manifests a "phase transition" from a regime in which the scaling solution depends on the initial condition to a regime in which it is independent of it. The selection mechanism which is found has many similarities to the marginal stability mechanism which has been widely studied in the context of fronts propagating into unstable states. The general scaling forms are presented and their practical and theoretical applications are discussed.
description: 42 pages
Controllable magnon-induced transparency in a ferromagnetic material via cross- and self-Kerr effects
Creators: name: Munir, Akhtar
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Nonlinear interactions between optical fields and magnetic modes in cavity magnonics constitute a rich source of various nontrivial effects in optics and quantum information processing. In cavity magnonics, the nonlinear cross-Kerr effect, which shifts the cavity's central frequency when a magnetic material is pumped, causes the system to exhibit both Kittle and magnetostatic modes. Here, we propose a new scheme for the investigation of probe fields transmission profiles in cavity magnonic systems composed of a microwave cavity and a ferromagnetic material (Yttrium iron garnet sphere). We report single-to-double magnon-induced transparency (MIT) dips and a sharp magnon-induced absorption (MIA) peak, and demonstrate how nonlinear cross- and self-Kerr interactions can significantly enhance or suppress these phenomena. It is observed that the splitting of the MIT window occurs when we incorporate magnon-magnon modes coupling, which helps introducing a new degree of freedom to light-matter interaction problems. Moreover, we investigate the propagation of group delay in the vicinity of transparency and demonstrate how a sharp dip allows the realization of slow light for a longer period of time. We found that both the cavity-Kittle and magnon-magnon modes coupling parameters influence the propagation of group delay, which demonstrates how subluminal-to-superluminal (and vice versa) propagation phenomena may occur and transform. These findings could pave the way for future research into nonlinear effects with novel applications in cavity magnonics devices, which might be exploited for several applications such as quantum computing devices and quantum memories.
Bayesian spatial and ecological modeling of suicide rates
Creators: name: Lin, Yi
Publisher: name: University of British Columbia
Year: 2009

description: Suicide and suicide attempts constitute major public and mental health problems in many countries. The risk factors of suicide include not only psychological and other individual features but also the characteristics of the community in which the people live. Therefore, in order to better understand the potential impacts of community characteristics on suicide, the regional level effects of suicide need to be thoroughly examined. For this thesis, an ecological analysis was incorporated into a Bayesian disease mapping study in order to estimate suicide rates, explore regional risk factors, and discern spatial patterns in suicide risks. Fully Bayesian disease mapping and ecological regression methods were used to estimate area-specific suicide risks, investigate spatial variations, and explore and quantify the associations between regional characteristics and suicide occurrences. The fact that spatially smoothed estimates of suicide rates highlight the high risk regions can act as stable health outcome indicators at the regional level. Furthermore, regional characteristics explored as potential risk factors of suicide rates can provide a better understanding of regional variations of suicide rates. Both can help in planning future public health prevention programs. In order to avoid multicollinearity among risk factors and reduce the dimensionality of the risk indicators, Principal Component Analysis and Empirical Bayes method (via Penalized Quasi-Likelihood) were applied in variable selection and highlighting risk patterns. Using 10-year aggregated data for all age groups and both genders, this study conducted a comprehensive analysis of suicide hospitalization and mortality rates in eighty-four Local Health Areas in British Columbia (Canada). A broad range of regional characteristics was investigated and different associations with suicide rates were observed in different demographic and gender groups. The major regional risk patterns related to suicide rates across age groups were social and economic characteristics, which include unemployment rates, income, education attainment, marital status, family structure, and dwellings. Some age groups also showed a relation to aboriginal population, immigrants, and language. The results of this study may inform policy initiatives and programs for suicide prevention.
A 2.15 Hour Orbital Period for the Low Mass X-Ray Binary XB 1832-330 in the Globular Cluster NGC 6652
Creators: name: Engel, Megan C.
name: Heinke, Craig O.
name: Sivakoff, Gregory R.
name: Elshamouty, Khaled G.
name: Edmonds, Peter D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a candidate orbital period for the low mass X-ray binary XB 1832-330 in the globular cluster NGC 6652 using a 6.5 hour Gemini South observation of the optical counterpart of the system. Light curves in g' and r' for two LMXBs in the cluster, sources A and B in previous literature, were extracted and analyzed for periodicity using the ISIS image subtraction package. A clear sinusoidal modulation is evident in both of A's curves, of amplitude ~0.11 magnitudes in g' and ~0.065 magnitudes in r', while B's curves exhibit rapid flickering, of amplitude ~1 magnitude in g' and ~0.5 magnitudes in r'. A Lomb-Scargle test revealed a 2.15 hour periodic variation in the magnitude of A with a false alarm probability less than 10^-11, and no significant periodicity in the light curve for B. Though it is possible saturated stars in the vicinity of our sources partially contaminated our signal, the identification of A's binary period is nonetheless robust.
description: 7 pages, 7 figures, ApJ in press
Simulating cosmic string loop captured by a rotating black hole
Creators: name: Deng, Heling
name: Gruzinov, Andrei
name: Levin, Yuri
name: Vilenkin, Alexander
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the dynamics of a cosmic string loop captured by a rotating black hole, ignoring string reconnections. A loop is numerically evolved in Kerr spacetime, with the result that it turns into one or more growing or contracting double-lines rotating around the black hole in the equatorial plane. This is in good agreement with the approximate analytical treatment of the problem investigated by Xing et al., who studied the evolution of the auxiliary curve associated with the string loop. We confirm that the auxiliary curve deformation can indeed describe the string motion in realistic physical scenarios to a reasonable accuracy, and can thus be used to further study other phenomena such as superradiance and reconnections of the captured loop.
description: 28 pages, 10 figures
Stripe-tetragonal phase transition in the 2D Ising model with dipole interactions: Partition-function zeros approach
Creators: name: Fonseca, Jacyana S. M.
name: Rizzi, Leandro G.
name: Alves, Nelson A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We have performed multicanonical simulations to study the critical behavior of the two-dimensional Ising model with dipole interactions. This study concerns the thermodynamic phase transitions in the range of the interaction δwhere the phase characterized by striped configurations of width h=1 is observed. Controversial results obtained from local update algorithms have been reported for this region, including the claimed existence of a second-order phase transition line that becomes first order above a tricritical point located somewhere between δ=0.85 and 1. Our analysis relies on the complex partition function zeros obtained with high statistics from multicanonical simulations. Finite size scaling relations for the leading partition function zeros yield critical exponents νthat are clearly consistent with a single second-order phase transition line, thus excluding such tricritical point in that region of the phase diagram. This conclusion is further supported by analysis of the specific heat and susceptibility of the orientational order parameter.
description: to appear in Phys. Rev. E
Leo Weisgerber, Sprachwissenschaftliche Beitrage zur frührheinischen Siedlungs- und Kulturgeschichte I.
Creators: name: Oxé, August
Publisher: name: Bonner Jahrbücher
Year: 2020

description: Rezension zu: Leo Weisgerber, Sprachwissenschaftliche Beitrage zur frührheinischen Siedlungs- und Kulturgeschichte I. (Sonderdruck aus ‘Rheinisches Museum für Philologie’ 84, 1935, 289—359.)
description: Bonner Jahrbücher, Bd. 143/144 (1938): Bonner Jahrbücher des Vereins von Altertumsfreunden im Rheinlande und des Rheinischen Provinzialmuseums in Bonn
Weyl invariance and the conductivity of the protoinflationary plasma
Creators: name: Giovannini, Massimo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a globally neutral Lorentzian plasma as a possible remnant of a preinflationary stage of expansion and pose the problem of the suitable initial conditions for the evolution of the large-scale electromagnetic inhomogeneities. During the protoinflationary regime the Weyl invariance of the Ohmic current guarantees that the comoving conductivity is approximately constant. The subsequent breaking of Weyl invariance by the masses of the charge carriers drives the conductivity to zero. The newly derived conducting initial conditions for the amplification of large-scale magnetic fields are contrasted with the conventional vacuum initial conditions. It is shown, in a specific class of examples, that when the number of inflationary efolds is close to minimal the effects of the conducting initial conditions cannot be neglected.
description: 9 pages, no figures
Potential effects of the proposed Polar Gas Pipline on the physical environment, Baker Lake, N.W.T.
Creators: name: Lesky, Mark Joseph
Publisher: name: Environmental Design
Year: 1979
Subjects: subject: TD 195 P5 L46 1979 Microfiche
subject: Gas, Natural - Pipe lines - Environmental aspects - Northwest Territories

description: Bibliography: p. 104-113.
Optical Properties of Host Galaxies of Extragalactic Nuclear Water Masers
Creators: name: Zhu, Guangtun
name: Zaw, Ingyin
name: Blanton, Michael R.
name: Greenhill, Lincoln J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the optical properties of the host galaxies of nuclear 22 GHz (lambda=1.35 cm) water masers. To do so, we cross-match the galaxy sample surveyed for water maser emission (123 detections and 3806 non-detections) with the SDSS low-redshift galaxy sample (z<0.05). Out of 1636 galaxies with SDSS photometry, we identify 48 detections; out of the 1063 galaxies that also have SDSS spectroscopy, we identify 33 detections. We find that maser detection rate is higher at higher optical luminosity (M_B), larger velocity dispersion ($σ$), and higher [OIII]5007 luminosity, with [OIII]5007 being the dominant factor. These detection rates are essentially the result of the correlations of isotropic maser luminosity with all three of these variables. These correlations are natural if maser strength increases with central black hole mass and the level of AGN activity. We also find that the detection rate is higher in galaxies with higher extinction. Based on these results, we propose that maser surveys seeking to efficiently find masers should rank AGN targets by extinction-corrected [OIII]5007 flux when available. This prioritization would improve maser detection efficiency, from an overall ~ 3% without pre-selection to ~ 16% for the strongest intrinsic [OIII]5007 emitters, by a factor of ~ 5.
description: Accepted to ApJ., in emulateapj style, 13 pages, 12 figures, 1 long table
Use of public and school libraries by junior and senior high school students in the Forest Lawn area of Calgary
Creators: name: Dueck, Ila-Mae Marie
Publisher: name: University of Calgary
Year: 1973
Subjects: subject: Z 711.3 D82 1973 Microfiche
subject: Library use studies - Alberta - Calgary
subject: School libraries - Alberta - Calgary
subject: Public libraries - Alberta - Calgary
subject: Junior high school students
subject: Senior high school students

description: Bibliography: p. 83-85.
Negative refraction in Al:ZnO/ZnO metamaterial in the near-infrared
Creators: name: Naik, Gururaj V.
name: Liu, Jingjing
name: Kildishev, Alexander V.
name: Shalaev, Vladimir M.
name: Boltasseva, Alexandra
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Noble metals such as gold and silver are the primary metallic building blocks of metamaterial devices. Making subwavelength-sized structural elements from these metals seriously limits the optical performance of a device, however, and complicates the manufacturing process of nearly all metamaterial devices in the optical wavelength range. As an alternative to noble metals, we propose to use heavily-doped oxide semiconductors that offer both functional and fabrication advantages in the near-infrared. In this letter, we report an experimental demonstration of negative refraction in a near-infrared metamaterial device that is designed and fabricated using aluminum-doped zinc oxide.
description: 4 figures + 1 supplementary document with 3 figures
Optimization of Process Variables to Develop Teff-Amaranth Based Extrudates
Creators: name: Aregay Berhe
Publisher: name: Zenodo
Year: 2014

description: Response Surface Methodology was adopted to study the effect of barrel temperature (A), screw

speed (B), feed moisture content (C) and blend ratio (D) to optimize the proximate composition,

physical properties(expansion ratio, bulk density and specific length), functional properties(WAI and

WSI) and sensory quality attributes during extrusion process to develop teff-amaranth based extrudates

using twin screw co-rotating extruder. Kuncho and red teff grains with voucher numbers DZ-C1-387 and

DZ-01-99, respectively and three amaranth varieties (white, pale-white and black amaranth) were

studied for proximate composition, mineral content, phytochemical content and functional properties. The

moisture contents for DZ-C1-387 and DZ-01-99 were11.12 and 12.27%, respectively. The proximate

compositions of DZ-C1-387 were 12.46(protein), 2.82(fat), 2.82(ash), 2.45(crude fiber) and 68.64% (total

CHO), respectively, and the proximate composition of DZ-01-99 were 10.19, 2.42, 2.42, 2.51and 70.12%

for crude protein, crude fat, ash, crude fiber and total CHO respectively. The energy value of DZ-C1-

387(349.78kcal/100g) was significantly (p<0.05) higher than the energy value of DZ-01-99

(343.02kcal/100g). Among the three amaranth varieties, moisture (10.24), protein (17.85), fat (7.00), ash

(2.70), crude fiber (6.86) and total CHO (55.35%), respectively were the proximate compositions for

white amaranth. The proximate compositions of pale-white amaranth were11.50, 14.15, 6.30, 5.40, 2.20

and 60.45% for moisture, crude protein, crude fat, crude fiber, ash, total CHO, respectively. The

moisture, crude protein, crude fat, crude fiber, ash and total CHO content of the black amaranth were

10.89, 15.30, 6.50, 5.75, 2.40 and 59.16%, respectively
Origin and extent of the opacity challenge for atmospheric retrievals of WASP-39 b
Creators: name: Niraula, Prajwal
name: de Wit, Julien
name: Gordon, Iouli E.
name: Hargreaves, Robert J.
name: Sousa-Silva, Clara
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: As the James Webb Space Telescope (JWST) came online last summer, we entered a new era of astronomy. This new era is supported by data products of unprecedented information content that require novel reduction and analysis techniques. Recently, Niraula et al. 2022 (N22) highlighted the need for upgraded opacity models to prevent facing a model-driven accuracy wall when interpreting exoplanet transmission spectra. Here, we follow the same approach as N22 to explore the sensitivity of inferences on the atmospheric properties of WASP-39 b to the opacity models used. We find that the retrieval of the main atmospheric properties from this first JWST exoplanet spectrum is mostly unaffected by the current state of the community's opacity models. Abundances of strong opacity sources like water and carbon dioxide are reliably constrained within $\sim$0.30 dex, beyond the 0.50 dex accuracy wall reported in N22. Assuming the completeness and accuracy of line lists, N22's accuracy wall is primarily driven by model uncertainties on broadening coefficients and far-wing behaviors, which we find to have marginal consequences for interpreting the transmission spectra of large, hot, high-metallicity atmospheres such as WASP-39 b, in opposition to emission spectra and climate modeling which depend on deeper parts of a planetary atmosphere. The origin of the opacity challenge in the retrieval of metal-rich hot Jupiters via transmission spectroscopy will thus mostly stem from the incompleteness and inaccuracy of line lists.
description: 10 Pages, 6 Figures
Analytic and numerical demonstration of quantum self-correction in the 3D Cubic Code
Creators: name: Bravyi, Sergey
name: Haah, Jeongwan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A big open question in the quantum information theory concerns feasibility of a self-correcting quantum memory. A quantum state recorded in such memory can be stored reliably for a macroscopic time without need for active error correction if the memory is put in contact with a cold enough thermal bath. In this paper we derive a rigorous lower bound on the memory time $T_{mem}$ of the 3D Cubic Code model which was recently conjectured to have a self-correcting behavior. Assuming that dynamics of the memory system can be described by a Markovian master equation of Davies form, we prove that $T_{mem}\ge L^{cβ}$ for some constant $c>0$, where $L$ is the lattice size and $β$ is the inverse temperature of the bath. However, this bound applies only if the lattice size does not exceed certain critical value $L^*\sim e^{β/3}$. We also report a numerical Monte Carlo simulation of the studied memory indicating that our analytic bounds on $T_{mem}$ are tight up to constant coefficients. In order to model the readout step we introduce a new decoding algorithm which might be of independent interest. Our decoder can be implemented efficiently for any topological stabilizer code and has a constant error threshold under random uncorrelated errors.
description: 40 pages, 6 figures
Zero Modes of Fermions Trapped by Giant Vortices
Creators: name: Gates, Logan
name: Penin, Alexander A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Zero-energy solutions of the Dirac equation for the fermions bound to giant vortices of large winding number $n$ are studied in the abelian Higgs and Chern-Simons Higgs models. The case of Jackiw-Rossi theory of the Majorana states in topological superconductors is discussed in detail. By expanding in inverse powers of $n$ we find an analytic result for asymptotically all $n$ solutions required by the index theorem. In the abelian Higgs model the zero modes fill the vortex core and reveal a universal structure independent of fine details of the gauge and scalar field interactions which, in particular, determines the general properties of the large-$n$ superconducting cosmic strings. On the contrary, for the Chern-Simons Higgs vortices the zero modes are localized on the core boundary and the explicit solution is obtained for the supersymmetric couplings in a self-dual background.
description: 15 pages, 2 figures
Modeling and control of high speed machine tool feed drives
Creators: name: Okwudire, Chinedum
Publisher: name: University of British Columbia
Year: 2009

description: Aerospace, die and mold, and automotive industries machine parts at high cutting speeds to reduce production cycle periods. Machine tools which carry out the cutting operations rely on either precision ball screw or linear motor direct drives to accurately position the workpiece relative to the cutting tool. However, the precise positioning capability of the drives is limited by low servo bandwidth and poor disturbance rejection resulting from structural flexibilities in ball screw drives as well as weak dynamic stiffness/robustness in direct drives. This thesis proposes modeling, parameter identification, control and online parameter estimation techniques which aim at increasing the servo bandwidth and disturbance rejection ability of high speed machine tool feed drives. A hybrid finite element methodology is used to model the structural dynamics of ball screw drives. As part of the model, two stiffness matrices are developed for connecting the finite element representation of the ball screw to the lumped-mass representation of the nut. The developed model is used to analyze the coupled axial-torsional-lateral vibration behavior of a critical structural mode that limits high bandwidth control of ball screw drives. Moreover, a method for accurately identifying the mass, damping and stiffness matrices representing the open-loop dynamics of ball screw drives is developed. The identified matrices are used to design gain-scheduled sliding mode controllers, combined with minimum tracking error filters, to effectively suppress the critical axial-torsional-lateral mode of ball screw drives thereby achieving high bandwidth control and good disturbance rejection. For direct-driven machines, a high bandwidth disturbance adaptive sliding mode controller is designed to improve the dynamic stiffness of the drive, compared to similar controller designs, without increasing the controller’s complexity. Furthermore, the cutting forces applied to the drive are estimated accurately using a disturbance recovery algorithm and used to improve the dynamic stiffness of low-frequency structural modes of direct-driven machine tools. Finally, a method for estimating the changing mass of the workpiece during machining operations with cutting forces that are periodic at spindle frequency is introduced. The techniques presented in this thesis are verified through simulations and/or experiments on single-axis ball screw and linear motor feed drives.
Understanding the progenitor formation galaxies of merging binary black holes
Creators: name: Srinivasan, Rahul
name: Lamberts, Astrid
name: Bizouard, Marie Anne
name: Bruel, Tristan
name: Mastrogiovanni, Simone
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: With nearly a hundred gravitational wave detections, the origin of black hole mergers has become a key question. Here, we focus on understanding the typical galactic environment in which binary black hole mergers arise. To this end, we synthesize progenitors of binary black hole mergers as a function of the redshift of progenitor formation, present-day formation galaxy mass, and progenitor stellar metallicity for $240$ star formation and binary evolution models. We provide guidelines to infer the formation galaxy properties and time of formation, highlighting the interplay between the star formation rate and the efficiency of forming merging binary black holes from binary stars, both of which strongly depend on metallicity. We find that across models, over 50% of BBH mergers have a progenitor metallicity of a few tenths of Solar metallicity, however, inferring formation galaxy properties strongly depends on both the binary evolution model and global metallicity evolution. The numerous, low-mass black holes ($\mathrm{\lesssim 15\,M_{\odot}}$) trace the bulk of the star formation in galaxies heavier than the Milky Way ($M_\mathrm{Gal}$ $\mathrm{\gtrsim 10^{10.5}\,M_{\odot}}$). In contrast, heavier BBH mergers typically stem from larger black holes forming in lower metallicity dwarf galaxies ($M_\mathrm{Gal}$ $\mathrm{\lesssim 10^{9}\,M_{\odot}}$). We find that the progenitors of detectable binary black holes tend to arise from dwarf galaxies at a lower formation redshift ($\lesssim \, 1$). We also produce a posterior probability of the progenitor environment for any detected gravitational wave signal. For the massive GW150914 merger, we show that it likely came from a very low metallicity ($Z$ $\mathrm{\lesssim}\,0.025\,\mathrm{Z_{\odot}}$) environment.
description: 17 pages, 15 figures, 1 table, Accpeted for publication by MNRAS