cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Der Einfluß elastischer Platten (Schiffswände) auf das hydroakustische Propellerdruckfeld
Creators: name: Kloppenburg, Meinolf
Publisher: name: TUHH Universitätsbibliothek
Year: 1972
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: In der vorliegenden Arbeit wird das hydroakustische Druckfeld einer vom Propeller zu Schwingungen angeregten ebenen elastischen Platte bestimmt. Die Umgebung der elastischen Platte ist starr; jedoch wird theoretisch auch der Fall behandelt, daß die Umgebung, durch die Wasseroberfläche gebildet wird. Die errechneten Ergebnisse werden mit dem hydroakustischen Druckfeld des Propellers verglichen. Außerdem wird die Möglichkeit, die anregende Druckkraft durch Rückpfeilung des Propellers zuverringern, theoretisch angegeben und durch Rechenbeispiele belegt.
description: The hydroacoustic pressurefield of an oscillating elastic flat plate excited by the field of a ship's propeller is calculated. The environment of the elastic flat plate is considered to be rigid; However, theoretical prediction is also given for the case that the watersurface forms the environment. The numerical results are compared with the propeller's hydroacoustic pressurefield. In addition, the possibility of decreasing the exciting pressure by using a skewed propeller is dealt with theoretically and confirmed by numerical examples.
VLBI for Gravity Probe B. V. Proper Motion and Parallax of the Guide Star, IM Pegasi
Creators: name: Ratner, M. I.
name: Bartel, N.
name: Bietenholz, M. F.
name: Lebach, D. E.
name: Lestrade, J. -F.
name: Ransom, R. R.
name: Shapiro, I. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present the principal astrometric results of the very-long-baseline interferometry (VLBI) program undertaken in support of the Gravity Probe B (GP-B) relativity mission. VLBI observations of the GP-B guide star, the RS CVn binary IM Pegasi (HR 8703), yielded positions at 35 epochs between 1997 and 2005. We discuss the statistical assumptions behind these results and our methods for estimating the systematic errors. We find the proper motion of IM Peg in an extragalactic reference frame closely related to the International Celestial Reference Frame 2 (ICRF2) to be -20.83 +- 0.03 +- 0.09 mas/yr in right ascension and -27.27 +- 0.03 +- 0.09 mas/yr in declination. For each component the first uncertainty is the statistical standard error and the second is the total standard error (SE) including plausible systematic errors. We also obtain a parallax of 10.37 +- 0.07 mas (distance: 96.4 +- 0.7 pc), for which there is no evidence of any significant contribution of systematic error. Our parameter estimates for the ~25-day-period orbital motion of the stellar radio emission have SEs corresponding to ~0.10 mas on the sky in each coordinate. The total SE of our estimate of IM Peg's proper motion is ~30% smaller than the accuracy goal set by the GP-B project before launch: 0.14 mas/yr for each coordinate of IM Peg's proper motion. Our results ensure that the uncertainty in IM Peg's proper motion makes only a very small contribution to the uncertainty of the GP-B relativity tests.
description: Accepted for publication in the Astrophysical Journal Supplement Series
HI Power Spectra and the Turbulent ISM of Dwarf Irregular Galaxies
Creators: name: Zhang, Hong-Xin
name: Hunter, Deidre A.
name: Elmegreen, Bruce G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: HI spatial power spectra (PS) were determined for a sample of 24 nearby dwarf irregular galaxies selected from the LITTLE THINGS (Local Irregulars That Trace Luminosity Extremes - The HI Nearby Galaxy Survey) sample. The two-dimensional (2D) power spectral indices asymptotically become a constant for each galaxy when a significant part of the line profile is integrated. For narrow channel maps, the PS become shallower as the channel width decreases, and this shallowing trend continues to our single channel maps. This implies that even the highest velocity resolution of 1.8 km/s is not smaller than the thermal dispersion of the coolest, widespread HI component. The one-dimensional PS of azimuthal profiles at different radii suggest that the shallower PS for narrower channel width is mainly contributed by the inner disks, which indicates that the inner disks have proportionally more cooler HI than the outer disks. Galaxies with lower luminosity (M_B > -14.5 mag) and star formation rate (SFR, log(SFR (M\odot/yr)) < -2.1) tend to have steeper PS, which implies that the HI line-of-sight depths can be comparable with the radial length scales in low mass galaxies. A lack of a correlation between the inertial-range spectral indices and SFR surface density implies that either non-stellar power sources are playing a fundamental role in driving the interstellar medium (ISM) turbulent structure, or the nonlinear development of turbulent structures has little to do with the driving sources.
description: 16 pages, 9 figures, 2 tables. Accepted by ApJ
The development of Shikoku Henro : the formation and dissemination of a pilgrimage in pre-modern Japan : a case study of Shikoku
Creators: name: Okawa, Eiji
Publisher: name: University of British Columbia
Year: 2009

description: This study will examine the development of a pilgrimage in Shikoku, Japan, commonly known as Shikoku henro. Anyone familiar with this pilgrimage would know that this is a topic that has drawn much academic and non-academic attention in the recent years. We have come to know more about this pilgrimage than ever before, thanks to the meticulous studies that have been conducted by scholars in and out of Japan. If there is a general trend in the recent studies, it is toward the anthropological/sociological interpretation of the pilgrimage, and the interactions of the pilgrimage with the society in which it exists. These studies also tend to focus on the modern era. Doubtless, such focuses are immensely valuable when seeking to shed light to this complex phenomenon. However, it may be time that we can reconsider the historical processes around this pilgrimage, by incorporating the recent findings of this and other pilgrimages, and by re-examining the historical materials pertaining to the subject. Thus, I will focus on the pre-modern developments in the pilgrimage of Shikoku. Specifically, the religious themes and the activities of the religious specialists in relation to the pilgrimage will be thoroughly analyzed in the context of pre-modern Japan (before 1868). In doing so, I will deal with issues that have yet to be addressed, such as the relationship between the pilgrimage and the pilgrimage temples. One might be inclined to assume that the two came hand in hand from the start—that the temples and their affiliates, as the prime beneficiaries of the pilgrimage, must have taken various measures to lure the pilgrims. Such an assumption, however, would drape the dynamics behind the formation of this pilgrimage, as will be demonstrated in this thesis.
Hexagonal $ABC$ as semiconducting ferroelectrics
Creators: name: Bennett, Joseph W.
name: Garrity, Kevin F.
name: Rabe, Karin M.
name: Vanderbilt, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We use a first-principles rational-design approach to identify a previously-unrecognized class of ferroelectric materials in the $P63mc$ LiGaGe structure type. We calculate structural parameters, polarization and ferroelectric well depths both for reported and as-yet hypothetical representatives of this class. Our results provide guidance for the experimental realization and further investigation of high-performance materials suitable for practical applications.
description: 5 pages, 2 figures, 3 tables
Suzaku X-ray spectral study of the Compton-thick Seyfert galaxy NGC 5135
Creators: name: Singh, Veeresh
name: Risaliti, Guido
name: Braito, Valentina
name: Shastri, Prajval
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the 0.5 - 50 keV Suzaku broad-band X-ray spectral study of the Compton-thick AGN in NGC 5135. The Suzaku observation provides the first detection of NGC 5135 above 10 keV that allowed us, for the first time, to estimate the absorbing column density, the intrinsic X-ray luminosity, the strength of the reflection component and the viewing angle of the torus for this AGN. The 0.5 - 10 keV spectrum of NGC 5135 is characterized by the standard components for a Compton-thick source: a scattered continuum, a prominent Fe Kα emission line (EW ~ 2.1 keV) and a soft excess. At higher energies (E > 10 keV) the intrinsic AGN continuum shows up, implying an absorbing column density of the order of ~ 2.5 \times 10^24 cm^-2 and the intrinsic 2.0 - 10 keV X-ray luminosity of ~ 1.8 \times 10^43 erg s^-1. Assuming a toroidal geometry of the reprocessing material we show that an edge-on view of the obscuring torus is preferred in this source.
description: 7 pages, 2 figures, accepted for publication in MNRAS
A New Type of Exact Arbitrarily Inhomogeneous Cosmology: Evolution of Deceleration in the Flat Homogeneous-On-Average Case
Creators: name: Hellaby, Charles
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A new method for constructing exact inhomogeneous universes is presented, that allows variation in 3 dimensions. The resulting spacetime may be statistically uniform on average, or have random, non-repeating variation. The construction utilises the Darmois junction conditions to join many different component spacetime regions. In the initial simple example given, the component parts are spatially flat and uniform, but much more general combinations should be possible. Further inhomogeneity may be added via swiss cheese vacuoles and inhomogeneous metrics. This model is used to explore the proposal, that observers are located in bound, non-expanding regions, while the universe is actually in the process of becoming void dominated, and thus its average expansion rate is increasing. The model confirms qualitatively that the faster expanding components come to dominate the average, and that inhomogeneity results in average parameters which evolve differently from those of any one component, but more realistic modelling of the effect will need this construction to be generalised.
description: JCAP Latex, 14pp, 2 figures(2nd with 5 plots), 4 tables
Eine Anordnung zum Studium von Stabilität und Dämpfung rollender Schiffe auf See
Creators: name: Baumann, Hellmut
Publisher: name: TUHH Universitätsbibliothek
Year: 1958
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Eine Anordnung zum Studium von Stabilität und Dämpfung rollender Schiffe auf See
Entwicklung einer numerischen Methode zur Vorhersage der hydroakustischen Schallabstrahlung von Schiffspropellern
Creators: name: Göttsche, Ulf
Publisher: name: TUHH Universitätsbibliothek
Year: 2020
Subjects: subject: Propellerschall
subject: Ffowcs-Wiliams Hawkings
subject: FWH
subject: Randelementmethode
subject: Schichtkavitation
subject: propeller underwater noise
subject: boundary element method
subject: sheet cavitation
classificationCode: 600
subject: Technik

description: In dieser Dissertation wird ein Verfahren zur Vorhersage der hydroakustischen Schallabstrahlung von Propellern im frühen Entwurfsprozess entwickelt. Die Schallvorhersage wird mit einem hybriden Verfahren durchgeführt, wobei die Strömung mit einem Randelementverfahren und der hydroakustische Schall mit der Ffowcs Williams-Hawkings-Gleichung unter Berücksichtigung von Reflexionen berechnet werden. Das Verfahren wird an einem Propeller hinter einem Schiff validiert. Dabei zeigen die berechneten Schalldruckpegel gute Übereinstimmung mit Messdaten. Weiterhin werden die Ergebnisse mit bestehenden Richtlinien zur Aufbereitung von Messdaten verglichen.
description: In this dissertation a method for the prediction of hydroacoustic sound emission of propellers in the early design stage is developed. The sound prediction is performed by a hybride approach. A boundary element method is used for flow calculation and the Ffowcs Williams-Hawkings-equation for hydroacoustic sound prediction, extended to considering reflections. The method is validated by a calculation of a propeller behind a ship. The calculated sound pressure levels does agree well with measured data. Additional the simulation results are compared with exisitng guidelines for processing of measurement data.
Sex differences in the neurogenic and behavioural effects of repeated estradiol administration in the adult rat
Creators: name: Barker, Jennifer Marie
Publisher: name: University of British Columbia
Year: 2009

description: Estradiol affects neurogenesis in the hippocampus of adult female mammals, but relatively little is known about how estradiol affects cells in the male brain, or how repeated estradiol administration affects either sex. I show in this thesis that repeated estradiol affects cell production and neuron survival in the dentate gyrus of female, but not male rats. Specifically, estradiol administered to female rats increased cell proliferation, decreased the number of young neurons, and decreased the number of dying cells. This difference was not due to differential uptake of estradiol, as the administration of estradiol resulted in concentrations of estradiol in the serum, hippocampus, amygdala, and prefrontal cortex that were similar between males and females. The function served by the new neurons in the hippocampus remains controversial, but evidence suggests they may play a particularly important role in modulating performance in hippocampus-dependent tasks. I used a hippocampus-dependent task, contextual fear conditioning, to determine whether the effects of estradiol on different aspects of neurogenesis - or lack thereof - could be related to its effects on learning and memory. I found a consistent sex difference, with males spending more time freezing than females regardless of treatment. Furthermore, I found that repeated estradiol reduces the amount of time spent freezing in response to a novel context after training in females but not in males. Collectively my results suggest that repeated estradiol influences hippocampal structure and function in female but not male rats. Furthermore the production and survival of adult-generated neurons are regulated differently in males and females which has strong implications for any potentially therapeutic manipulations of these cells.
Phonon Pulse Shape Discrimination in SuperCDMS Soudan
Creators: name: Hertel, S. A.
name: Pyle, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: SuperCDMS is the next phase of the Cryogenic Dark Matter Search experiment, which measures both phonon and charge signals generated by particle recoils within a germanium target mass. Charge signals are employed both in the definition of a fiducial volume and in the rejection of electron recoil background events. Alternatively, phonons generated by the charge carriers can also be used for the same two goals. This paper describes preliminary efforts to observe and quantify these contributions to the phonon signal and then use them to reject background events. A simple analysis using only one pulse shape parameter shows bulk electron recoil vs. bulk nuclear recoil discrimination to the level of 1:10^3 (limited by the statistics of the data), with little degradation in discrimination ability down to at least 7 keV recoil energy. Such phonon-only discrimination can provide a useful cross-check to the standard discrimination methods, and it also points towards the potential of a device optimized for a phonon-only measurement.
description: Low Temperature Detector 14 conference proceedings, to be published in a special issue of the Journal of Low Temperature Physics
Personality correlates of overachievement and underachievement
Creators: name: Behrens, L. Ted
Publisher: name: University of Calgary
Year: 1977
Subjects: subject: BF 698.9 A3 B45 1976 Microfiche
subject: Personality and academic achievement
subject: Personality assessment
subject: Self-perception
subject: Differential values inventory

description: Bibliography; p. 148-154.
title: Pedicle screw fixation
title: Pedikelschrauben Fixierung
titleType: AlternativeTitle
Creators: name: Murray, Rebecca Anne
Publisher: name: TUHH Universitätsbibliothek
Year: 2014
Subjects: subject: Wirbelsäule
subject: Biomechanik
subject: Pedikelschraube
subject: Lockerung
subject: Fixierung
subject: Wirbel
subject: medizinische Schraube
subject: spine
subject: biomechanics
subject: pedicle screw
subject: loosening
subject: fixation
subject: vertebra
subject: medical screw
classificationCode: 610
subject: Medizin
classificationCode: 44.09
subject: Medizintechnik
subject: Wirbelsäulenchirurgie

description: Pedikelschrauben sind der Goldstandard in der posterioren Wirbelsäulenchirurgie sowohl zur Versorgung von Frakturen, als auch zur Förderung von Fusionen und Ausrichtung der Wirbelsäulenachse. In den letzten 15 Jahren wurde diesbezüglich ein Anstieg von Lockerungen am Knochen-Schrauben-Interface verzeichnet, so dass diese Komplikation mittlerweile die häufigste Versagensursache dieser Systeme darstellt. In der vorliegenden Studie wurden durch eine Umfrage unter Chirurgen, Quantifizierung von in vivo Versagensmustern sowie präklinischer Testung die, im Hinblick auf Schraubenlockerung, günstigsten Schrauben-Positionierungen, Augmentierungstechniken und Designmerkmale der Schrauben ermittelt.
description: Pedicle screws are considered the ‘gold standard’ in posterior spinal surgery for stabilizing fractures, promoting fusion and correcting spinal alignment. However, in the past 15 years there has been a rise in their most prevalent clinical failure, a loss of fixation at the bone-screw interface. Pedicle screw loosening was investigated by means of a surgeon survey, quantifying in vivo failure patterns, and by using pre-clinical testing methods to ascertain the most favorable screw positionings, augmentation techniques, and screw design features.
Sparticle mass spectra from SU(5) SUSY GUT models with $b-τ$ Yukawa coupling unification
Creators: name: Baer, Howard
name: Gogoladze, Ilia
name: Mustafayev, Azar
name: Raza, Shabbar
name: Shafi, Qaisar
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Supersymmetric grand unified models based on the gauge group SU(5) often require in addition to gauge coupling unification, the unification of b-quark and $τ$-lepton Yukawa couplings. We examine SU(5) SUSY GUT parameter space under the condition of $b-τ$ Yukawa coupling unification using 2-loop MSSM RGEs including full 1-loop threshold effects. The Yukawa-unified solutions break down into two classes. Solutions with low tanβ~3-11 are characterized by gluino mass ~1-4 TeV and squark mass ~1-5 TeV. Many of these solutions would be beyond LHC reach, although they contain a light Higgs scalar with mass <123 GeV and so may be excluded should the LHC Higgs hint persist. The second class of solutions occurs at large tanβ~35-60, and are a subset of $t-b-τ$ unified solutions. Constraining only $b-τ$ unification to ~5% favors a rather light gluino with mass ~0.5-2 TeV, which should ultimately be accessible to LHC searches. While our $b-τ$ unified solutions can be consistent with a picture of neutralino-only cold dark matter, invoking additional moduli or Peccei-Quinn superfields can allow for all of our Yukawa-unified solutions to be consistent with the measured dark matter abundance.
description: 19 pages, 5 figures, 1 table, PDFLateX
Interlayer Registry Determines the Sliding Potential of Layered Metal Dichalcogenides: The case of 2H-MoS2
Creators: name: Blumberg, Adi
name: Keshet, Uri
name: Zaltsman, Inbal
name: Hod, Oded
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We provide a simple and intuitive explanation for the interlayer sliding energy landscape of metal dichalcogenides. Based on the recently introduced registry index (RI) concept, we define a purely geometrical parameter which quantifies the degree of interlayer commensurability in the layered phase of molybdenum disulphide (2HMoS2). A direct relation between the sliding energy landscape and the corresponding interlayer registry surface of 2H-MoS2 is discovered thus marking the registry index as a computationally efficient means for studying the tribology of complex nanoscale material interfaces in the wearless friction regime.
description: 13 pages, 7 figures
The Forgotten Land and People of Northeast Nigeria: Pre-Colonial Politics and Administration of Bade Polity, 1500-1904
Creators: name: Fidelis, Imeje
Publisher: name: figshare
Year: 2021
Subjects: Ethnic Studies
History

description:
Bade is situated in Yobe State, Northeast Nigeria. The pre-history of the area is among the least studied in Nigeria. Hence, this paper attempts to bridge that gap by examining pre-colonial politics and administration of the Bade area from 1500 CE. to 1904 CE. It examines the evolution of Bade politics and administration from the founding of Tagali in 1500 CE. to the centralization of administration in 1904 CE. The paper aims to carefully examine the nature of pre-colonial politics and administration in the Bade area with a view to bring to the fore the peculiarities andsimilarities inherent in the different stages of the evolution and development of Bade political history.
Festschrift anlässlich des 100. Geburtstages von Prof. Dr.-Ing. Kurt Wendel- Gedanken zur Schiffssicherheit
Creators: name: Krüger, Stefan
name: Abels, Wilfried
Publisher: name: TUHH Universitätsbibliothek
Year: 2008
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Festschrift anlässlich des 100. Geburtstages von Prof. Dr.-Ing. Kurt Wendel Gedanken zur Schiffssicherheit
Wasserbauliche Systemanalyse zur Bewertung der Auswirkungen des Klimawandels für tidebeeinflusste Nebengewässer der Elbe
Creators: name: Nehlsen, Edgar
Publisher: name: TUTECH Verlag
Year: 2017
Subjects: subject: Systemanalyse
subject: Tidedynamik
subject: Sedimenttransport
subject: Sperrwerke
subject: kombinierte Wahrscheinlichkeiten
subject: numerische Modellierung
subject: Auswirkungen Klimawandel
classificationCode: 620
subject: Ingenieurwissenschaften

description: Die vorliegende Arbeit behandelt drei wesentliche wasserbauliche Fragestellungen an den Nebenflüssen der Unterelbe. Diese beziehen sich auf i) den Hochwasserschutz, ii) die Morphodynamik und die morphologische Entwicklung sowie iii) die Auswirkungen des Klimawandels auf das Abflussgeschehen sowie die Morphodynamik in den tidebeeinflussten Unterläufen.
description: The present work focusses on three major hydraulic engineering issues at the tidal tributaries of the Lower Elbe. These issues relate to i) flood protection, ii) morphodynamics and morphological development, as well as iii) the impact of climate change on runoff and morphodynamics in the tidal-influenced lower reaches.
Selenium isotope fractionation during chemical and microbiological selenite reduction
Creators: name: Rashid, Kamal Mohammad Asad
Publisher: name: University of Calgary
Year: 1978
Subjects: subject: QD 181 S5 R36 1978 Microfiche
subject: Selenium - Isotopes
subject: Selenium - Physiological effect
subject: Reduction, Chemical

description: Bibliography: p. 100-109.
Oxygen and sulfur isotope studies of natural sulfates
Creators: name: Shakur, M. Asif
Publisher: name: University of Calgary
Year: 1979
Subjects: subject: QD 181 S1 S52 1979 Microfiche
subject: sulphates
subject: Oxygen - Isotopes
subject: Sulphur - Isotopes

description: Bibliography: p. 103-115.
Tight-binding analysis of the electronic structure of dilute bismide alloys of GaP and GaAs
Creators: name: Usman, Muhammad
name: Broderick, Christopher A.
name: Lindsay, Andrew
name: O'Reilly, Eoin P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We develop an atomistic, nearest-neighbor sp3s* tight-binding Hamiltonian to investigate the electronic structure of dilute bismide alloys of GaP and GaAs. Using this model we calculate that the incorporation of dilute concentrations of Bi in GaP introduces Bi-related defect states in the band gap, which interact with the host matrix valence band edge via a Bi composition dependent band anti-crossing (BAC) interaction. By extending this analysis to GaBiAs we demonstrate that the observed strong variation of the band gap Eg and spin-orbit-splitting (SO) energy with Bi composition can be well explained in terms of a BAC interaction between the extended states of the GaAs valence band edge and highly localized Bi-related defect states lying in the valence band, with the change in Eg also having a significant contribution from a conventional alloy reduction in the conduction band edge energy. Our calculated values of Eg and SO are in good agreement with experiment throughout the investigated composition range x less than 13%. In particular, our calculations reproduce the experimentally observed crossover to an Eg < SO regime at approximately 10.5% Bi composition in bulk GaBiAs. Recent x-ray spectroscopy measurements have indicated the presence of Bi pairs and clusters even for Bi compositions as low as 2%. We include a systematic study of different Bi nearest-neighbor environments in the alloy to achieve a quantitative understanding of the effect of Bi pairing and clustering on the GaBiAs electronic structure.
description: 14 Pages, 13 Figures, Accepted for publication in PRB
VLBI for Gravity Probe B. IV. A New Astrometric Analysis Technique and a Comparison with Results from Other Techniques
Creators: name: Lebach, D. E.
name: Bartel, N.
name: Bietenholz, M. F.
name: Campbell, R. M.
name: Gordon, D.
name: Lederman, J. I.
name: Lestrade, J. -F.
name: Ransom, R. R.
name: Ratner, M. I.
name: Shapiro, I. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: When VLBI observations are used to determine the position or motion of a radio source relative to reference sources nearby on the sky, the astrometric information is usually obtained via: (i) phase-referenced maps; or (ii) parametric model fits to measured fringe phases or multiband delays. In this paper we describe a "merged" analysis technique which combines some of the most important advantages of these other two approaches. In particular, our merged technique combines the superior model-correction capabilities of parametric model fits with the ability of phase-referenced maps to yield astrometric measurements of sources that are too weak to be used in parametric model fits. We compare the results from this merged technique with the results from phase-referenced maps and from parametric model fits in the analysis of astrometric VLBI observations of the radio-bright star IM Pegasi (HR 8703) and the radio source B2252+172 nearby on the sky. In these studies we use central-core components of radio sources 3C 454.3 and B2250+194 as our positional references. We obtain astrometric results for IM Peg with our merged technique even when the source is too weak to be used in parametric model fits, and we find that our merged technique yields superior astrometric results to the phase-referenced mapping technique. We used our merged technique to estimate the proper motion and other astrometric parameters of IM Peg in support of the NASA/Stanford Gravity Probe B mission.
description: Accepted for publication in the Astrophysical Journal Supplement Series
Optimal pricing using online auction experiments: A Pólya tree approach
Creators: name: George, Edward I.
name: Hui, Sam K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: We show how a retailer can estimate the optimal price of a new product using observed transaction prices from online second-price auction experiments. For this purpose we propose a Bayesian Pólya tree approach which, given the limited nature of the data, requires a specially tailored implementation. Avoiding the need for a priori parametric assumptions, the Pólya tree approach allows for flexible inference of the valuation distribution, leading to more robust estimation of optimal price than competing parametric approaches. In collaboration with an online jewelry retailer, we illustrate how our methodology can be combined with managerial prior knowledge to estimate the profit maximizing price of a new jewelry product.
description: Published in at http://dx.doi.org/10.1214/11-AOAS503 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A Study of computer-assisted instruction in junior high school mathematics: an individually self-progressive system
Creators: name: Huang, Henry Chung-Chi
Publisher: name: University of Calgary
Year: 1979
Subjects: subject: LB 1028.5 H78 1979 Fiche
subject: Mathematics - Computer-assisted instruction
subject: Mathematics - Study and teaching (Elementary)

description: Bibliography: p. 115-123.
Measurement of the intracluster light at z ~ 1
Creators: name: Burke, Claire
name: Collins, Chris A.
name: Stott, John P.
name: Hilton, Matt
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A significant fraction of the total photospheric light in nearby galaxy clusters is thought to be contained within the diffuse intracluster light (ICL), which extends 100s of kpc from cluster cores. The study of the ICL can reveal details of the evolutionary histories and processes occurring within galaxy clusters, however since it has a very low surface brightness it is often difficult to detect. We present here the first measurements of the ICL as a fraction of total cluster light at z \sim 1 using deep J-band (1.2 μm) imaging from HAWK-I on the VLT. We investigate the ICL in 6 X-ray selected galaxy clusters at 0.8< z <1.2 and find that the ICL below isophotes μ(J) = 22 mag/arcsec2 constitutes 1-4% of the total cluster light within a radius R500. This is broadly consistent with simulations of the ICL at a similar redshift and when compared to nearby observations suggests that the fraction of the total cluster light that is in the ICL has increased by a factor 2 - 4 since z\sim1. We also find the fraction of the total cluster light contained within the Brightest Cluster Galaxy (BCG) to be 2.0-6.3% at these redshifts, which in 5 out of 6 cases is larger than the fraction of the ICL component, in contrast to results from nearby clusters. This suggests that the evolution in cluster cores involves substantial stripping activity at late times, in addition to the early build up of the BCG stellar mass through merging. The presence of significant amounts of stellar light at large radii from these BCGs may help towards solving the recent disagreement between the semi-analytic model predictions of BCG mass growth (e.g. De Lucia & Blaziot, 2007) and the observed large masses and scale sizes reported for BCGs at high redshift.
description: 12 pages, 12 figures. Accepted for publication in MNRAS
Three essays in macroeconomics and international economics
Creators: name: Tang, Yao
Publisher: name: University of British Columbia
Year: 2009

description: This dissertation examines two issues in international economics and macroeconomics. The first is to understand the response of productivity to major real exchange rate appreciations and the second concerns how to compare the fits of different calibrated macroeconomic models. In the first chapter, I construct a model to clarify how the increased competition due to an exchange rate appreciation provides incentive for firms to improve productivity. However, if a firm is in an industry shielded by a high trade cost, then the incentive is weaker. In industries with fewer firms, profits are more responsive to productivity improvements, therefore, firms are more likely to invest more heavily in productivity improvement. Empirical analysis of Canadian manufacturing data from 1997 to 2006 finds evidence consistent with the model predictions. The second chapter presents testing procedures for comparison of misspecified calibrated models. The proposed tests are of the Vuong-type (Vuong, 1989; Rivers and Vuong, 2002). In the framework here, an econometrician selects values for the parameters in order to match some characteristics of the data with those implied by the theoretical model. We assume that all competing models are misspecified, and suggest a test for the null hypothesis that all considered models provide equal fit to the data characteristics, against the alternative that one of the models is a better approximation. The Carlstrom and Fuerst (1997) model and the Bernanke, Gertler and Gilchrist (1999) model are two leading models that study financial frictions in macroeconomic models. In particular, these models show that due to financial frictions, net worth plays an important role in obtaining external finance, and that at an aggregate level, net worth can propagate technology shocks and monetary shocks. However, neither paper examines whether the models can reproduce cyclical properties of net worth. The third chapter addresses this issue by applying the comparison method developed in the third chapter. Results indicate both models do reasonably well. In addition, price rigidity seems to play an important role in the latter model. However, both models can only partially capture the positive correlation between risk premium and net worth.
Kooperationen zwischen KMU und Hochschulinstituten - Herausforderungen und Lösungsansätze
Creators: name: Herstatt, Cornelius
name: Raasch, Antje-Christina
name: Buse, Stephan
Publisher: name: TUHH Universitätsbibliothek
Year: 2007
Subjects: subject: F
subject: KMU
subject: Klein- und Mittelbetrieb
subject: Forschungsförderung
subject: Forschungskooperation
subject: Klein- und Mittelbetrieb

description: Im Rahmen des RIS-Projekts wurden zum Thema der Forschungs- und Entwicklungskooperationen zwischen KMU und wissenschaftlichen Einrichtungen mehrere empirische Befragungen sowie ein gemeinsamer Workshop mit Vertretern beider Gruppen durchgeführt. Die Untersuchungsergebnisse synthetisierend ist festzuhalten, dass F&E-Kooperationen zwischen KMU und Hochschulinstituten für beide Partner einen hohen Stellenwert einnehmen. Beide Seiten beurteilen gemeinsame Forschungsprojekte für die Erreichung ihrer Ziele als attraktives Instrument mit guten Erfolgsaussichten. Dieser Einschätzung entsprechend hat die Mehrzahl der befragten Unternehmen und Institute bereits bei mindestens einer F&EKooperation mitgewirkt. Die Zufriedenheit mit den durchgeführten Projekten war sehr hoch, wurden doch die Erwartungen oft deutlich übertroffen. Nichtsdestotrotz wurden während der empirischen Untersuchungen zwei Problembereiche identifiziert: Zum einen scheitern viele Kooperationen bereits vor ihrer Entstehung, d. h. sie kommen trotz positiver Erfolgserwartungen nicht zustande. Und zum anderen können, der gesamthaften Zufriedenheit mit dem Projekterfolg ungeachtet, in Bezug auf das Kooperationsmanagement teils erhebliche Verbesserungspotenziale identifiziert werden. Das Zustandekommen von F&E-Kooperationen zwischen KMU und Hochschulinstituten wird zum einen durch ein Informationsdefizit seitens der KMU erschwert, die vielfach über wenig Kenntnisse zum Leistungsspektrum möglicher Partnerinstitute sowie zu geeigneten Ansprechpartnern verfügen. Begründet liegt dieser Kenntnismangel oft in der geringen Priorität, die der Evaluation von Kooperationsmöglichkeiten im Rahmen des Tagesgeschäfts von KMU eingeräumt werden kann. Lösungsansätze, die diese Besonderheit berücksichtigen, wurden im Rahmen des Workshops entwickelt. Einen zweiten wesentlichen Hinderungsgrund beim Zustandekommen von Kooperationen bildet die unzureichende Ausstattung an Finanzmitteln, die KMU sowie auch staatliche Förderprogramme zur Verfügung stellen können. Drittens erweist sich auch die Einigung bzgl. des Projektumfangs, insbesondere bzgl. der Projektdauer, aufgrund divergierender Vorstellungen und Interessenlagen als problematisch. Im Bereich des Kooperationsmanagements wurden vor allem die Kommunikation zwischen den Partnern sowie die Effizienz der Zusammenarbeit als verbesserungsbedürftig beurteilt. Zur Überwindung von Kommunikationsproblemen wurden während des Workshops vielfältige praxisnahe Lösungsansätze erarbeitet. Ein gesteigerter Einsatz von Methoden des Projektmanagements und -controllings erscheint zur Effizienzsteigerung sowie zur Absprache eines gemeinsamen Zeithorizonts der F&E-Zusammenarbeit und dessen Einhaltung angezeigt.
Stable isotopes for identifying accumulation and ablation on the Wapta Icefield
Creators: name: Hislop, Randall William Patrick
Publisher: name: University of Calgary
Year: 1974
Subjects: subject: GB 2405 H56 1974 Microfiche
subject: Ice - Alberta - Measurement
subject: Radioisotopes in geology
subject: Glaciology

description: Bibliography: p. 86-87.
On ε-conjecture in a-theorem
Creators: name: Nakayama, Yu
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The derivation of the a-theorem recently proposed by Komargodski and Schwimmer relies on the ε-conjecture that demands decoupling of dilaton from the rest of the infrared theory. We point out that the decoupling, if true, provides a strong evidence for the equivalence between scale invariance and conformal invariance in four dimension. Thus, a complete proof of the a-theorem along the line of their argument in the most generic scenario would establish the equivalence between scale invariance and conformal invariance, which is another long-standing conjecture in four-dimensional quantum field theories.
description: 5 pages, v2: clarifications added to emphasize that we have no intention of invalidating the derivation by Komargodski and Schwimmer when the renormalization group flow is between two conformal field theories
Herstellung und chemo-elektromechanische Charakterisierung von Aktoren aus nanoporösem Gold und Polypyrrol
Creators: name: Roschning, Benedikt
Publisher: name: TUHH Universitätsbibliothek
Year: 2020
Subjects: subject: nanoporous gold
subject: actuation
subject: polypyrrole
subject: strain-charge coupling
subject: stress-charge coupling
classificationCode: 600
subject: Technik
classificationCode: 620
subject: Ingenieurwissenschaften

description: Im Rahmen dieser Arbeit wurden millimetergroße Aktoren aus nanoporösem Gold und Polypyrrol hergestellt und auf ihr chemo-elektromechanisches Kopplungsverhalten untersucht. Es wurde die elektrochemisch kontrollierte Eigenspannungsentwicklung im Polypyrrol quantifiziert und zu der makroskopischen Verformung der Aktoren in Relation gesetzt. Dabei wurde gezeigt, dass die Verformung der Polypyrrolschicht zwischen benachbarten Struktureinheiten des nanoporösen Substrats die Aktorik maßgeblich beeinflusst.
description: In this thesis, millimeter-sized actuators made from nanoporous gold and polypyrrole were manufactured and investigated with respect to their chemo-electromechanical coupling. The electrochemically controlled residual stress within the polypyrrole was quantified and related to the macroscopic deformation of the actuators. It was shown that the deformation of the polypyrrole layer between adjacent structural units of the nanoporous substrate has a significant impact on the actuation.
Instabilities and Patterns in Coupled Reaction-Diffusion Layers
Creators: name: Catlla, Anne J.
name: McNamara, Amelia
name: Topaz, Chad M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study instabilities and pattern formation in reaction-diffusion layers that are diffusively coupled. For two-layer systems of identical two-component reactions, we analyze the stability of homogeneous steady states by exploiting the block symmetric structure of the linear problem. There are eight possible primary bifurcation scenarios, including a Turing-Turing bifurcation that involves two disparate length scales whose ratio may be tuned via the inter-layer coupling. For systems of $n$-component layers and non-identical layers, the linear problem's block form allows approximate decomposition into lower-dimensional linear problems if the coupling is sufficiently weak. As an example, we apply these results to a two-layer Brusselator system. The competing length scales engineered within the linear problem are readily apparent in numerical simulations of the full system. Selecting a $\sqrt{2}$:1 length scale ratio produces an unusual steady square pattern.
description: 13 pages, 5 figures, accepted for publication in Phys. Rev. E
Non-linear inversion for relative permittivity
Creators: name: Lam, Kim
Publisher: name: University of British Columbia
Year: 2009

description: The gradient method, Levenberg-Marquardt (LM) method, L₂ cooled roughness (CRL2) method and L₁ cooled roughness (CRL1) method are applied to the problem of recovering the relative permittivity structure of a dielectric object. The CRL1 method is a novel technique for the recovery of the relative permittivity structure of a dielectric object introduced in this work. The frequencies used in this work range from 0.80Hz to 1.2 GHz. The size of the permittivity structure is approximately 1 wavelength, which is approximately 30cm at 10Hz. The gradient method and LM method were unable to recover the relative permittivity structure unless the starting model is very close to the target. Both methods require a starting model that is close to the target model for them to be successful. The CRL2 method was able to recover a blurry approximation to the target relative permittivity structure. The blurriness is due to the L₂ norm. The CRL1 method is able to recover “blocky” structure. In the absence of noise, the CRL1 method was able to recover structure that was approximately one third wavelength in size. The recovery of structure at a fraction of a wavelength is highly sensitive to noise. Even at 0.0 1% noise, the CRL1 algorithm had difficulty recovering the exact structure.
On the physiology and biochemistry of dormancy and germination in light-sensitive lettuce seeds
Creators: name: Fountain, David Winchester
Publisher: name: University of Calgary
Year: 1974
Subjects: subject: QK 740 F67 1974 Microfiche
subject: Germination
subject: Growth inhibiting substances
subject: Growth promoting substances
subject: Lettuce

description: Bibliography: p. 220-241.
title: Effecten van zeespiegelstijging in de Schelde: deelrapport 3. iFlow‐simulates van getij en sediment
Creators: name: Schramkowski, George P.
name: Kaptein, Steven
Publisher: name: Flanders Hydraulics
Year: 2023

description: Title : WL Rapporten. Waterbouwkundig Laboratorium: Antwerpen. Volume : 19_058_3 Issue : Pagination : VIII, 32 + 3 p. bijl.
VLBI for Gravity Probe B. II. Monitoring of the Structure of the Reference Sources 3C 454.3, B2250+194, and B2252+172
Creators: name: Ransom, R. R.
name: Bartel, N.
name: Bietenholz, M. F.
name: Lebach, D. E.
name: Lederman, J. I.
name: Luca, P.
name: Ratner, M. I.
name: Shapiro, I. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We used 8.4 GHz VLBI images obtained at up to 35 epochs between 1997 and 2005 to examine the radio structures of the main reference source, 3C 454.3, and two secondary reference sources, B2250+194 and B2252+172, for the guide star for the NASA/Stanford relativity mission Gravity Probe B (GP-B). For one epoch in 2004 May, we also obtained images at 5.0 and 15.4 GHz. The 35 8.4 GHz images for quasar 3C 454.3 confirm a complex, evolving, core-jet structure. We identified at each epoch a component, C1, near the easternmost edge of the core region. Simulations of the core region showed that C1 is located, on average, 0.18 +- 0.06 mas west of the unresolved "core" identified in 43 GHz images. We also identified in 3C 454.3 at 8.4 GHz several additional components which moved away from C1 with proper motions ranging in magnitude between 0.9c and 5c. The detailed motions of the components exhibit two distinct bends in the jet axis located ~3 and ~5.5 mas west of C1. The spectra between 5.0 and 15.4 GHz for the "moving" components are steeper than that for C1. The 8.4 GHz images of B2250+194 and B2252+172, in contrast to those of 3C 454.3, reveal compact structures. The spectrum between 5.0 and 15.4 GHz for B2250+194 is inverted while that for B2252+172 is flat. Based on its position near the easternmost edge of the 8.4 GHz radio structure, close spatial association with the 43 GHz core, and relatively flat spectrum, we believe 3C 454.3 component C1 to be the best choice for the ultimate reference point for the GP-B guide star. The compact structures and inverted to flat spectra of B2250+194 and B2252+172 make these objects valuable secondary reference sources
description: Accepted for publication in the Astrophysical Journal Supplement Seris
Acceleration of Energetic Particles through Reconnection of Weakly Stochastic Magnetic Field
Creators: name: Lazarian, A.
name: Kowal, G.
name: Pino, E. Gouveia dal
name: Vishniac, E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Astrophysical media are turbulent and therefore reconnection should be treated in the presence of pre-existing turbulence. We consider the model of fast magnetic reconnection in Lazarian & Vishniac (1999) which predicts that the rate of reconnection is controlled by the intensity and the injection scale of turbulent motions. We provide new evidence of successful testing of the model and argue that the model presents a generic set up for astrophysical reconnection events. We study particle acceleration that takes place in volumes of driven turbulence as well turbulent volumes in the presence of large scale reconnection. We show that in the latter case the acceleration is of the first order Fermi type thus supporting the model of acceleration proposed in Gouveia dal Pino & Lazarian (2005).
description: review, 12 pages, 4 figures, to be published in the proceedings of Albach workshop