cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Prozessintensivierung durch die Einlösung von verdichteten Gasen in Flüssig-Feststoffsysteme
title: Process intensification with injection and dissolution of dense inert gases into liquid-solid systems
titleType: AlternativeTitle
Creators: name: Voges, Susanna
Publisher: name: TUHH Universitätsbibliothek
Year: 2008
Subjects: subject: injection
subject: dissolution
subject: inert gas
subject: liquid-solid system
subject: process intensification
classificationCode: 58.13
subject: Thermische Verfahrenstechnik
subject: Lösung
subject: Injektion
subject: Inertgas
subject: Fest-Flüssig-System
subject: Effizienzsteigerung
subject: Prozessinnovation

description: Die vorliegende Arbeit befasst sich mit der Einlösung von verdichteten Inertgasen in Flüssig-Feststoffsysteme. Dazu wurden zwei Verfahren beispielhaft betrachtet: die gasunterstützte Pressung von Ölsaaten sowie die Versprühung von inertgasbeladenen Suspensionen (Flüssigkaffee)zum Zweck der Sprühtrocknung. Als Inertgase kommen Kohlendioxid und Stickstoff zum Einsatz. Bedingt durch die Änderung von Stoffdaten bei Verwendung von Kohlendioxid und durch eine Gas-Expansionsströmung kommt es in den betrachteten Systemen zu einer Prozessintensivierung.
description: The present thesis treats the injection and dissolution of dense inert gases such as carbon dioxide and nitrogen into liquid-solid systems. For that purpose, two exemplary processes are studied: the gas assisted pressing of oil seeds and the gas aided spraying of suspensions in spray drying processes. In consequence of the change in physical properties in case of carbon dioxide dissolution and a gas expansion flow during depressurisation a process intensification is attained in both systems.
Brownian colloidal particles: Ito, Stratonovich or a different stochastic interpretation
Creators: name: Sancho, J. M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Recent experiments on Brownian colloidal particles have been studied theoretically in terms of overdamped Langevin equations with multiplicative white noise using an unconventional stochastic interpretation. Complementary numerical simulations of the same system are well described using the conventional Stratonovich interpretation. Here we address this dichotomy from a more generic starting point: the underdamped Langevin equation and its corresponding Fokker--Planck equation.
Preparation of the secondary school theatre arts teacher in B. Ed. programmes in Canadian English language universities
Creators: name: Bayley, Peter John Elsmore
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: PN 1701 B38 1972 Microfilm
subject: Drama - Study and teaching
subject: Drama in education
subject: Teachers, Training of - Canada

description: Bibliography: p. 159-169.
Magnetic Sublevel Population and Alignment for the Excitation of H- and He-like Uranium in Relativistic Collisions
Creators: name: Gumberidze, A.
name: Fritzsche, S.
name: Hagmann, S.
name: Kozhuharov, C.
name: Ma, X.
name: Steck, M.
name: Surzhykov, A.
name: Warczak, A.
name: Stöhlker, Th.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We have measured the alignment of the L-shell magnetic-substates following the K-shell excitation of hydrogen- and helium-like uranium in relativistic collisions with a low-Z gaseous target. Within this experiment the population distribution for the L-shell magnetic sublevels has been obtained via an angular differential study of the decay photons associated with the subsequent de-excitation process. The results show a very distinctive behavior for the H- and He-like heavy systems. In particular for $K \rightarrow L$ excitation of He-like uranium, a considerable alignment of the L-shell levels was observed. A comparison of our experimental findings with recent rigorous relativistic predictions provides a good qualitative and a reasonable quantitative agreement, emphasizing the importance of the magnetic-interaction and many-body effects in the strong-field domain of high-Z ions.
Phonoemissive Spin Tunneling in Molecular Nanomagnets
Creators: name: Garg, Anupam
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A new mechanism is proposed for the magnetization reversal of molecular nanomagnets such as \Fe8. In this process the spin tunnels from the lowest state near one easy direction to the first excited state near the opposite easy direction, and subsequently decays to the second easy direction with the emission of a phonon, or it first emits a phonon and then tunnels to the final state. This mechanism is the simplest imaginable one that allows magnetization relaxation in the presence of a longitudinal magnetic field that is so large that the nuclear spin environment cannot absorb the energy required for energy conservation to hold. It is proposed as a way of understanding both magnetization realaxation and Landau-Zener-Stückelberg experiments. The requisite Fermi golden rule rate, and the spin-flip rates are calculated, and it is found that these rates are much too low by several orders of magnitude. Thus the understanding of magnetic relaxation in the experiments remains an open question.
description: Paper prepared using Annalen der Physik macros, and submitted to AdP
SMARTS optical and infrared monitoring of 12 gamma-ray bright blazars
Creators: name: Bonning, E. W.
name: Urry, C. M.
name: Bailyn, C.
name: Buxton, M.
name: Chatterjee, R.
name: Coppi, P.
name: Fossati, G.
name: Isler, J.
name: Maraschi, L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present multiwavelength data for twelve blazars observed from 2008-2010 as part of an ongoing optical-infrared photometric monitoring project. Sources were selected to be bright, southern (dec < 20 deg) blazars observed by the Fermi Gamma-Ray Space Telescope, with daily and weekly gamma-ray fluxes made available from the start of the Fermi mission. Light curves are presented for the twelve blazars in BVRJK at near-daily cadence. We find that optical and infrared fluxes are well correlated in all sources. Gamma-ray bright flat spectrum radio quasars (FSRQs) in our sample have optical/infrared emission correlated with gamma-rays consistent with inverse Compton-scattering models for GeV emission. In FSRQs, the variability amplitude decreases towards optical/IR wavelengths, consistent with the presence of a thermal emission component from the accretion disk varying on significantly longer timescales than the jet synchrotron emission. In BL Lac objects, variability is mainly constant across wavelengths, consistent with a weak or radiatively inefficient disk. FSRQs have redder optical-infrared colors when they are brighter, while BL Lac objects show no such trend. Several objects show complicated color-magnitude behavior: AO 0235+164 appears in two different states depending on whether it is gamma-ray bright or not. OJ 287 and 3C 279 show some hysteresis tracks in their color-magnitude diagrams. Individual flares may be achromatic or otherwise depart from the trend, suggesting different jet components becoming important at different times. We present a time-dependent spectral energy distribution of the bright FSRQ 3C 454.3 during its December 2009 flare, which is well fit by an external Compton model in the bright state, although day to day changes pose challenges to a simple one-zone model. All data from the SMARTS monitoring program are publicly available on our website.
description: 71 pages, submitted to ApJ
Raven grows new feathers : realizing contemporary Indigenous visions of justice in Canada through the culturally sensitive interpretations of legal rights
Creators: name: Milward, David Leo
Publisher: name: University of British Columbia
Year: 2009

description: Indigenous peoples in Canada demand self-determination over criminal justice for a number of reasons. Indigenous approaches to justice that resemble restorative justice are thought to be more effective in dealing with Indigenous criminality, to promote the healing of offenders and victims, and to promote relationship reparation in Indigenous communities. Indigenous punitive sanctions such as corporal punishment may also provide a briefer deterrent alternative that avoids the hardening conditions of prisons. Indigenous peoples have little room to pursue these visions of justice. Canadian laws and policies accords only minor accommodations of Indigenous approaches to justice. This is sustained by a political culture that often demands harsher sentences to assure deterrence and public safety. Judicial treatment of the Aboriginal rights provision of the Constitution Act, 1982, provides limited scope for Indigenous peoples to litigate or negotiate for rights to substantive criminal jurisdiction. One approach to overcoming this is to litigate for an Indigenous right of internal autonomy. It gives Indigenous peoples a better position to demand greater accommodation for their justice practices. Another approach is for Indigenous communities to explore avenues for their own economic development, so that they can their own justice systems, free of external influence, to meet their needs. If Indigenous self-determination becomes a reality, there is another issue that is imperative to address. What happens when Indigenous individuals assert their legal rights under the Canadian Charter of Rights and Freedoms against their own justice systems? This engages a tension between Indigenous justice traditions that emphasize collective well-being and individual rights. There is a method for resolving this tension. The Royal Commission on Aboriginal Peoples explored the concept of culturally sensitive interpretation of legal rights, re-interpreting legal rights under the Charter to better reflect Indigenous justice traditions while still leaving in place meaningful safeguards against the abuse of collective power. This dissertation puts culturally sensitive interpretation into action by exploring specific proposals with reference to specific rights in the Charter.
Stability estimates for an inverse problem for the Schrödinger equation at negative energy in two dimensions
Creators: name: Santacesaria, Matteo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We study the inverse problem of determining a real-valued potential in the two-dimensional Schrödinger equation at negative energy from the Dirichlet-to-Neumann map. It is known that the problem is ill-posed and a stability estimate of logarithmic type holds. In this paper we prove three new stability estimates. The main feature of the first one is that the stability increases exponentially with respect to the smoothness of the potential, in a sense to be made precise. The others show how the first estimate depends on the energy, for low and high energies (in modulus). In particular it is found that for high energies the stability estimate changes, in some sense, from logarithmic type to Lipschitz type: in this sense the ill-posedness of the problem decreases when increasing the energy (in modulus).
description: 17 pages
Study of the role of the priest in education in a selected Catholic school system in Alberta
Creators: name: Kowalski, Alvin Edwin
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: LC 485 K67 1972 Microfilm
subject: Catholic Church - Education
subject: Catholic Church - Clergy
subject: Clergymen as teachers

description: Bibliography: p. 274-281.
Stent failure: the diagnosis and management of intracoronary stent restenosis
Creators: name: Protty, Majd B
name: Dissanayake, Tharindra
name: Jeffery, Daniel
name: Hailan, Ahmed
name: Choudhury, Anirban
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Cancer
subject: Science Policy
classificationCode: 111714
subject: Mental Health
subject: Computational Biology

description: Despite advances in stent technology for percutaneous coronary intervention (PCI) in the treatment of coronary disease, these procedures can be complicated by stent failure manifested as intracoronary stent restenosis (ISR). Even with advances in stent technology and medical therapy, this complication is reported to affect around 10% of all percutaneous coronary intervention (PCI) procedures. Depending on stent type (drug-eluting versus bare metal), ISR has subtle differences in mechanism and timing and offers different challenges in diagnosing etiology and subsequent treatment options. This review will be visiting the definition, pathophysiology, and risk factors of ISR. The evidence behind management options has been illustrated with the aid of real life clinical cases and summarized in a proposed management algorithm.
Band gaps in graphene via periodic electrostatic gating
Creators: name: Pedersen, Jesper Goor
name: Pedersen, Thomas Garm
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Much attention has been focused on ways of rendering graphene semiconducting. We study periodically gated graphene in a tight-binding model and find that, contrary to predictions based on the Dirac equation, it is possible to open a band gap at the Fermi level using electrostatic gating of graphene. However, comparing to other methods of periodically modulating graphene, namely perforated graphene structures, we find that the resulting band gap is significantly smaller. We discuss the intricate dependence of the band gap on the magnitude of the gate potential as well as the exact geometry of the edge of the gate region. The role of the overlap of the eigenstates with the gate region is elucidated. Considering more realistic gate potentials, we find that introducing smoothing in the potential distribution, even over a range of little more than a single carbon atom, reduces the attainable band gap significantly.
description: 9 pages, 9 figures
Evidence for asymmetric distribution of circumstellar material around Type Ia Supernovae
Creators: name: Förster, Francisco
name: González-Gaitán, Santiago
name: Anderson, Joseph
name: Marchi, Sebastián
name: Gutiérrez, Claudia P.
name: Hamuy, Mario
name: Pignata, Giuliano
name: Cartier, Régis
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study the properties of low-velocity material in the line of sight towards nearby Type Ia Supernovae (SNe Ia) that have measured late phase nebular velocity shifts (v_neb), thought to be an environment-independent observable. We have found that the distribution of equivalent widths of narrow blended Na I D1 & D2 and Ca II H & K absorption lines differs significantly between those SNe Ia with negative and positive v_neb, with generally stronger absorption for SNe Ia with v_neb > 0. A similar result had been found previously for the distribution of colors of SNe Ia, which was interpreted as a dependence of the temperature of the ejecta with viewing angle. Our work suggests that: 1) a significant part of these differences in color should be attributed to extinction, 2) this extinction is caused by an asymmetric distribution of circumstellar material (CSM) and 3) the CSM absorption is generally stronger on the side of the ejecta opposite to where the ignition occurs. Since it is difficult to explain 3) via any known physical processes that occur before explosion, we argue that the asymmetry of the CSM is originated after explosion by a stronger ionizing flux on the side of the ejecta where ignition occurs, probably due to a stronger shock breakout and/or more exposed radioactive material on one side of the ejecta. This result has important implications for both progenitor and explosion models.
description: 5 pages, 2 figures. Accepted for publication in ApJL
Overview of an Extensive Multi-wavelength Study of GX 339-4 during the 2010 Outburst
Creators: name: Bel, M. Cadolle
name: Rodriguez, J.
name: D'Avanzo, P.
name: Russell, D. M.
name: Tomsick, J.
name: Corbel, S.
name: Lewis, F.
name: Rahoui, F.
name: Buxton, M.
name: Goldoni, P.
name: Kuulkers, E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The microquasar GX 339-4 experienced a new outburst in 2010: it was observed simultaneously at various wavelengths from radio up to soft gamma-rays. We focused on observations that are quasi-simultaneous with those made with the INTEGRAL and RXTE satellites: these were collected in 2010 March-April during our INTEGRAL Target of Opportunity program, and during some of the other INTEGRAL observing programs with GX 339-4 in the field-of-view. X-ray transients are extreme systems that often harbour a black hole, and are known to emit throughout the whole electromagnetic spectrum when in outburst. The goals of our program are to understand the evolution of the physical processes close to the black hole and to study the connections between the accretion and ejection. We analysed radio, NIR, optical, UV, X-ray and soft gamma-ray observations. We studied the source evolution in detail by producing light curves, hardness-intensity diagrams and spectra. We fitted the broadband data with phenomenological, then physical, models to study the emission coming from the distinct components. Based on the energy spectra, the source evolved from the canonical hard state to the canonical soft state. The source showed X-ray spectral variations that were correlated with changes in radio, NIR and optical emission. The bolometric flux increased from 0.8 to 2.9*10^{-8} erg cm^{-2} s^{-1} while the relative flux and contribution of the hot medium globally decreased. Reprocessing in the disc was likely to be strong at the end of our observations. The source showed a behaviour similar to that of previous outbursts, with some small deviations in the hard X-rays parameters' evolution. The radio, NIR and optical emission from jets was detected, and seen to fade as the source softened. The results are discussed within the context of disc and jet models.
description: 13 pages, 10 figures, 4 tables. Accepted by A&A
QUESTIONNAIRE - USE OF THE CANVAS PLATFORMQUESTIONNAIRE - THE STUDENT LEARNING PROCESS PERSPECTIVE
Creators: name: Cieza-Mostacero, Segundo E.
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: QUESTIONNAIRE - USE OF THE CANVAS PLATFORMQUESTIONNAIRE - THE STUDENT LEARNING PROCESS PERSPECTIVE
Exact meromorphic stationary solutions of the real cubic Swift-Hohenberg equation
Creators: name: Conte, Robert
name: Ng, Tuen-Wai
name: Wong, Kwok-Kin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35Q53

description: We show that all meromorphic solutions of the stationary reduction of the real cubic Swift-Hohenberg equation are elliptic or degenerate elliptic. We then obtain them all explicitly by the subequation method, and one of them appears to be a new elliptic solution.
description: 15 pages, 3 figures, to appear, Studies in Applied Mathematics
The sparse Laplacian shrinkage estimator for high-dimensional regression
Creators: name: Huang, Jian
name: Ma, Shuangge
name: Li, Hongzhe
name: Zhang, Cun-Hui
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We propose a new penalized method for variable selection and estimation that explicitly incorporates the correlation patterns among predictors. This method is based on a combination of the minimax concave penalty and Laplacian quadratic associated with a graph as the penalty function. We call it the sparse Laplacian shrinkage (SLS) method. The SLS uses the minimax concave penalty for encouraging sparsity and Laplacian quadratic penalty for promoting smoothness among coefficients associated with the correlated predictors. The SLS has a generalized grouping property with respect to the graph represented by the Laplacian quadratic. We show that the SLS possesses an oracle property in the sense that it is selection consistent and equal to the oracle Laplacian shrinkage estimator with high probability. This result holds in sparse, high-dimensional settings with p >> n under reasonable conditions. We derive a coordinate descent algorithm for computing the SLS estimates. Simulation studies are conducted to evaluate the performance of the SLS method and a real data example is used to illustrate its application.
description: Published in at http://dx.doi.org/10.1214/11-AOS897 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Nuove acquisizioni sulla viabilità antica in Trexenta dal territorio di Ortacesus. Nota preliminare
Creators: name: Giuman, Marco
Publisher: name: Layers. Archeologia Territorio Contesti
Year: 2020

description: Abstract: Il contributo costituisce uno studio preliminare intorno alla viabilità antica nel territorio di Ortacesus (SU). Attraverso l’analisi dei dati ottenuti nel corso delle prime campagne di ricognizione archeologica svolte tra il 2018 e il 2019, il testo fornisce un primo quadro di quello che doveva essere l’assetto viario di quest’area della Trexenta. Abstract: The aim of this paper is to provide a preliminary study on ancient road system in the territory of Ortacesus (SU, Sardinia). The archaeological survey conducted in 2018 and 2019 has revealed some important information about the organization of ancient settlements and the road network of this area of Trexenta.
description: Layers. Archeologia Territorio Contesti, N. 5 (2020)
libCreme: An optimization library for evaluating convex-roof entanglement measures
Creators: name: Röthlisberger, Beat
name: Lehmann, Jörg
name: Loss, Daniel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present the software library libCreme which we have previously used to successfully calculate convex-roof entanglement measures of mixed quantum states appearing in realistic physical systems. Evaluating the amount of entanglement in such states is in general a non-trivial task requiring to solve a highly non-linear complex optimization problem. The algorithms provided here are able to achieve to do this for a large and important class of entanglement measures. The library is mostly written in the Matlab programming language, but is fully compatible to the free and open-source Octave platform. Some inefficient subroutines are written in C/C++ for better performance. This manuscript discusses the most important theoretical concepts and workings of the algorithms, focussing on the actual implementation and usage within the library. Detailed examples in the end should make it easy for the user to apply libCreme to specific problems.
description: 13 pages, 1 figure. The program code can be downloaded either from the CPC Library (http://cpc.cs.qub.ac.uk) or directly at http://quantumtheory.physik.unibas.ch/people/roethlisberger/libCreme.zip
Molecular gas and star formation in the Milky Way
Creators: name: Combes, Francoise
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The dense molecular gas is the ideal tracer of the spiral structure in the Milky Way, and should be used intensively to solve the puzzle of its structure. In spite of our position inside the plane, we can hope to disentangle the structures, with position-velocity diagrams, in addition to $(l-b)$. I summarize the state of the art simulations of gas flows in the MW, and describe what can be done to improve the models, taking into account the star formation, in view of what is already done in external galaxies, with a more favorable viewing angle.
description: 4 pages, 2 figures, to appear in the proceedings of "Assembling the Puzzle of the Milky Way", Le Grand Bornand (Apr. 17-22, 2011), C. Reyle, A. Robin, M. Schultheis (eds.)
Initiation of CME and Associated Flare Caused by Helical Kink Instability Observed by SDO/AIA
Creators: name: Kumar, Pankaj
name: Cho, K. -S.
name: Bong, S. -C.
name: Park, Sung-Hong
name: Kim, Y. H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this paper, we present multiwavelength observations of helical kink instability as a trigger of a CME which occurred in AR NOAA 11163 on 24 February 2011. The CME was associated with a M3.5 limb flare. High resolution observations from SDO/AIA suggest the development of helical kink instability in the erupting prominence, which implies a flux rope structure of the magnetic field. A brightening starts below the apex of the prominence with its slow rising motion (~100 km/s) during the activation phase. A bright structure, indicative of a helix with ~3-4 turns, was transiently formed at this position. The corresponding twist of ~$6π-8π$ is sufficient to generate the helical kink instability in a flux rope according to recently developed models. A slowly rising blob structure was subsequently formed at the apex of the prominence, and a flaring loop was observed near the footpoints. Within two minutes, a second blob was formed in the northern prominence leg. The second blob erupts (like a plasmoid ejection) with the detachment of the northern prominence leg, and flare intensity maximizes. The first blob at the prominence apex shows rotational motion in the counterclockwise direction in the plane of sky, interpreted as unwinding motion of a helix, and it also erupts to give the coronal mass ejection (CME). RHESSI hard X-ray sources show the two footpoint sources and a loop-top source during the flare. We found RHESSI hard X-ray flux, soft X-ray flux derivative and CME acceleration in the low corona correlate well, which is in agreement with the standard flare model (CSHKP). We also discuss the possible role of ballooning as well as torus instabilities in driving the CME. We conclude that the CME and flare were triggered by the helical kink instability in a flux rope and accelerated mainly by the torus instability.
description: 27 pages, 8 figures, Accepted in Astrophysical Journal (ApJ)
Muslim Americans in American Society—and in the German Classroom
Creators: name: Theis, Rolf D.
Publisher: name: Center for United States Studies, Halle (Saale)
Year: 2008
Subjects: American history
American literature
American culture

description: American studies journal; Vol. 52, No. 08, 2008. 2199-7268
description: Special Edition: Arab-American Literature and Culture
Compression Behaviour of Porous Dust Agglomerates
Creators: name: Seizinger, Alexander
name: Speith, Roland
name: Kley, Wilhelm
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The early planetesimal growth proceeds through a sequence of sticking collisions of dust agglomerates. Very uncertain is still the relative velocity regime in which growth rather than destruction can take place. The outcome of a collision depends on the bulk properties of the porous dust agglomerates. Continuum models of dust agglomerates require a set of material parameters that are often difficult to obtain from laboratory experiments. Here, we aim at determining those parameters from ab-initio molecular dynamics simulations. Our goal is to improveon the existing model that describe the interaction of individual monomers. We use a molecular dynamics approach featuring a detailed micro-physical model of the interaction of spherical grains. The model includes normal forces, rolling, twisting and sliding between the dust grains. We present a new treatment of wall-particle interaction that allows us to perform customized simulations that directly correspond to laboratory experiments. We find that the existing interaction model by Dominik & Tielens leads to a too soft compressive strength behavior for uni and omni-directional compression. Upon making the rolling and sliding coefficients stiffer we find excellent agreement in both cases. Additionally, we find that the compressive strength curve depends on the velocity with which the sample is compressed. The modified interaction strengths between two individual dust grains will lead to a different behaviour of the whole dust agglomerate. This will influences the sticking probabilities and hence the growth of planetesimals. The new parameter set might possibly lead to an enhanced sticking as more energy can be stored in the system before breakup.
description: 11 pages, 14 figures, accepted for publication in A&A
Free trade and the British West Indian sugar industry: an analysis of the Sugar Duties Act of 1846 and its effects on the sugar industry of Jamaica and Barbados
Creators: name: Brizan, George Ignatius
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: HD 9114 W42 B73 1972
subject: Sugar trade - West Indies
subject: Sugar growing - West Indies
subject: Great Britain. Laws, statutes, etc. Sugar Duties Act, 1846

description: Bibliography: p. 205-215.
Quantum Higgs branches of isolated N=2 superconformal field theories
Creators: name: Argyres, Philip C.
name: Maruyoshi, Kazunobu
name: Tachikawa, Yuji
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the Higgs branches of the superconformal points of four-dimensional N=2 super Yang-Mills (SYM) which appear due to the occurrence of mutually local monopoles having appropriate charges. We show, for example, that the maximal superconformal point of SU(2n) SYM has a Higgs branch of the form C^2/Z_n. These Higgs branches are intrinsic to the superconformal field theory (SCFT) at the superconformal point, but do not appear in the SYM theory in which it is embedded. This is because the embedding is a UV extension of the SCFT in which some global symmetry acting on the Higgs branch is gauged irrelevantly. Higgs branches deduced from earlier direct studies of these isolated SCFTs using BPS wall-crossing or 3-d mirror symmetry agree with the ones we find here using just the Seiberg-Witten data for the SYM theories.
description: 18 pages
Organizational form and the provision of quality in healthcare markets
Creators: name: Dubrovinsky, Dmitry
Publisher: name: University of British Columbia
Year: 2009

description: The quality of healthcare is an important issue in any society. In the US the question "Which hospitals provide higher quality of care: Non-Profit (NP) or For-Profit (FP) ones?" is interesting both from the consumer and the policymaker perspective. The Arrow-Hansmann hypothesis states that NPs provide a higher level of quality, because of the lower incentive to exploit the opportunity to increase profits by reducing quality. Substantial empirical literature, however, rejects the main implication of this hypothesis: that quality of output is higher at NP organizations than at FP organizations. This thesis proposes a theory of information asymmetry in healthcare markets that is consistent with the empirical evidence and generates additional testable implications. US hospital data on 2006-2007 mortality rates (a measure of quality) support the central implication of the model: FPs have higher variance of quality than NPs; 2006 data on US emergency room waiting times support the second implication: NPs have longer waiting times than FPs. Three additional implications find support in the data as well. Since the theory finds support in the data, I use it as a basis for policy recommendations. I review the various policy alternatives toward FP healthcare provision in the US. The theory developed herein supports government policies that encourage conversions of low-quality FPs into NPs. The analysis is built on two innovations. In the model presented doctors-entrepreneurs self-select between the NP and FP sectors based on ability and not the degree of altruism, as in the previous literature. In the empirical analysis related to quality I use a newly constructed dataset and test implications, not at the nation-wide level, as in the previous literature, but at the market level. The last feature makes my testing of NP theories the most direct to date. These innovations reveal a new picture of the healthcare markets that is in accordance with all of the existing empirical evidence that was previously regarded as contradictory.
Electroweak Corrections from Triplet Scalars
Creators: name: Khandker, Zuhair U.
name: Li, Daliang
name: Skiba, Witold
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compute the electroweak S and T parameters induced by SU(2)_L triplet scalars up to one-loop order. We consider the most general renormalizable potential for a triplet and the Standard Model Higgs doublet. Our calculation is performed by integrating out the triplet at the one-loop level and also includes the one-loop renormalization group running. Effective field theory framework allows us to work in the phase with unbroken SU(2)_L x U(1)_Y symmetry. Both S and T parameters exhibit decoupling when all dimensionful parameters are large while keeping dimensionless ratios fixed. We use bounds on S and T to constrain the triplet mass and couplings.
description: 18 pages
title: Simulation und Optimierung des Notstopp-Manövers von Schiffen mit langsamlaufenden Zweitaktmotoren und Festpropellern
title: Simulation and optimization of the crash-stop maneuver of vessels employing slow-speed engines and fixed-pitch propellers
titleType: AlternativeTitle
Creators: name: Wirz, Friedrich
Publisher: name: TUHH Universitätsbibliothek
Year: 2011
Subjects: subject: Notstopp
subject: Umsteuern
subject: Bremsweg
subject: Zweitaktmotor
subject: Festpropeller
subject: crash-stop
subject: reversing
subject: stopping distance
subject: slowspeed engine
subject: fixed-pitch propeller
subject: Zweitaktmotor
subject: Bremsweg

description: Die Konfiguration der Antriebsanlage von Schiffen hat einen wesentlichen Einfluss auf das Manövrierverhalten, insbesondere auf das Notstopp-Manöver. Schiffe mit langsamlaufendem Zweitaktmotor und Festpropeller weisen die längsten spezifischen und absoluten Stoppwege auf. In der Arbeit werden Lösungsansätze zur Verkürzung des Stoppweges hinsichtlich ihrer Wirksamkeit und technischen Umsetzbarkeit analysiert und bewertet.
description: The maneuvering performance of ships is highly influenced by the employed propulsion concept. Especially with respect to the crash-stop distance, a slow-speed two-stroke engine driving a fixed-pitch propeller is most unfavorable. Within the scope of the thesis, approaches for the reduction of the crash-stop distance are being analyzed and assessed regarding their influence and technical feasibility.
Mechanics and energetics of rorqual lunge feeding
Creators: name: Goldbogen, Jeremy Arthur
Publisher: name: University of British Columbia
Year: 2009

description: Rorquals whales are among the largest predators on earth, yet little is known about their foraging behavior at depth. These whales obtain their prey by lunge-feeding, an extraordinary biomechanical event where large amounts of water and prey are engulfed and filtered. This process is predicted to entail a high energetic cost that has major consequences for rorqual foraging ecology and efficiency. The present thesis examined the mechanics and energetics of lunge feeding using a combination of experimental and theoretical analyses. Body kinematics and respiratory events during foraging were determined using a digital acoustic tag. Kinematic data were incorporated into a hydrodynamic model of lunge feeding to calculate engulfment drag and volume. Finally, an allometric analysis was used to assess the effects of size and morphology on lunge feeding performance. The tag data demonstrate that rorquals glide to depth, execute several lunges at the bottom of a dive, and ascend to surface via active swimming strokes. Each lunge is marked by a rapid increase and decrease in body speed and a bout of active swimming strokes. During a lunge, a rorqual can engulf a volume of prey-laden water that is larger than its entire body, but at a high energetic cost because the drag, work against drag, and drag coefficient dramatically increase during the lunge. The allometry of rorqual feeding morphology enhances engulfment capacity, but at a higher energetic cost. Longer dives were required to perform more lunges at depth and these extended apneas were followed by an increase in the number of breaths taken after a dive. Maximum dive durations during foraging were approximately half of those for non-feeding whales. At the highest lunge frequencies, respiratory rate was at least threefold higher than that of non-feeding whales that underwent a similar degree of apnea. This thesis provided several lines of evidence that support the concept of high foraging costs in rorquals associated with lunge feeding. Despite this high cost, rorquals are able to sustain some of the largest animal masses that have ever existed, but it may also impose an upper limit on large body size in this lineage.
Revisiting the top-quark pair production at future $e^+e^-$ colliders
Creators: name: Ma, Jin
name: Wang, Sheng-Quan
name: Sun, Ting
name: Shen, Jian-Ming
name: Wu, Xing-Gang
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, we reanalyze the top-quark pair production at the next-to-next-to-leading order (NNLO) in QCD at future $e^+e^-$ colliders by using the Principle of Maximum Conformality (PMC) method. The PMC renormalization scales in $α_s$ are determined by absorbing the non-conformal $β$ terms by recursively using the Renormalization Group Equation (RGE). Unlike the conventional scale-setting method of fixing the scale at the center-of-mass energy $μ_r=\sqrt{s}$, the determined PMC scale $Q_\star$ is far smaller than the $\sqrt{s}$ and increases with the $\sqrt{s}$, yielding the correct physical behavior for the top-quark pair production process. Moreover, the convergence of the pQCD series for the top-quark pair production is greatly improved due to the elimination of the renormalon divergence. For a typical collision energy of $\sqrt{s}=500$ GeV, the PMC scale is $Q_\star=107$ GeV; the QCD correction factor $K$ for conventional results is $K\sim1+0.1244^{+0.0102+0.0012}_{-0.0087-0.0011}+0.0184^{-0.0086+0.0002}_{+0.0061-0.0003}$, where the first error is caused by varying the scale $μ_r\in[\sqrt{s}/2, 2\sqrt{s}]$ and the second error is from the top-quark mass $Δ{m_t}=\pm0.7$ GeV. After applying the PMC, the renormalization scale uncertainty is eliminated and the QCD correction factor $K$ is improved to $K\sim 1+0.1507^{+0.0015}_{-0.0015}-0.0057^{+0.0001}_{-0.0000}$, where the error is from the top-quark mass $Δ{m_t}=\pm0.7$ GeV. The PMC improved predictions for the top-quark pair production are helpful for detailed studies of properties of the top-quark at future $e^+e^-$ colliders.
description: 8 pages, 3 figures. Accepted by Chinese Physics C
The Cosmic Infrared Background Experiment (CIBER): The Wide-Field Imagers
Creators: name: Bock, J.
name: Sullivan, I.
name: Arai, T.
name: Battle, J.
name: Cooray, A.
name: Hristov, V.
name: Keating, B.
name: Kim, M. G.
name: Lam, A. C.
name: Lee, D. H.
name: Levenson, L. R.
name: Mason, P.
name: Matsumoto, T.
name: Matsuura, S.
name: Mitchell-Wynne, K.
name: Nam, U. W.
name: Renbarger, T.
name: Smidt, J.
name: Suzuki, K.
name: Tsumura, K.
name: Wada, T.
name: Zemcov, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have developed and characterized an imaging instrument to measure the spatial properties of the diffuse near-infrared extragalactic background light in a search for fluctuations from z > 6 galaxies during the epoch of reionization. The instrument is part of the Cosmic Infrared Background Experiment (CIBER), designed to observe the extragalactic background light above the Earth's atmosphere during a suborbital sounding rocket flight. The imaging instrument incorporates a 2x2 degree field of view, to measure fluctuations over the predicted peak of the spatial power spectrum at 10 arcminutes, and 7"x7" pixels, to remove lower redshift galaxies to a depth sufficient to reduce the low-redshift galaxy clustering foreground below instrumental sensitivity. The imaging instrument employs two cameras with Δλ/ λ~0.5 bandpasses centered at 1.1 and 1.6 microns to spectrally discriminate reionization extragalactic background fluctuations from local foreground fluctuations. CIBER operates at wavelengths where the electromagnetic spectrum of the reionization extragalactic background is thought to peak, and complements fluctuations measurements by AKARI and Spitzer at longer wavelengths. We have characterized the instrument in the laboratory, including measurements of the sensitivity, flat-field response, stray light performance, and noise properties. Several modifications were made to the instrument following a first flight in 2009 February. The instrument performed to specifications in subsequent flights in 2010 July and 2012 March, and the scientific data are now being analyzed.
description: 16 Pages, 16 figures, submitted to ApJS February 13 2012; accepted June 20 2012 as part of CIBER Instrument Special Issue
Instantons and Killing spinors
Creators: name: Harland, Derek
name: Nölle, Christoph
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 53C07, 83E50, 70S15

description: We investigate instantons on manifolds with Killing spinors and their cones. Examples of manifolds with Killing spinors include nearly Kaehler 6-manifolds, nearly parallel G_2-manifolds in dimension 7, Sasaki-Einstein manifolds, and 3-Sasakian manifolds. We construct a connection on the tangent bundle over these manifolds which solves the instanton equation, and also show that the instanton equation implies the Yang-Mills equation, despite the presence of torsion. We then construct instantons on the cones over these manifolds, and lift them to solutions of heterotic supergravity. Amongst our solutions are new instantons on even-dimensional Euclidean spaces, as well as the well-known BPST, quaternionic and octonionic instantons.
description: 40 pages, 2 figures v2: author email addresses and affiliations added
Die Kollisionsrate als Element des Systemansatzes im Schiffbau
Creators: name: Krappinger, Odo
Publisher: name: TUHH Universitätsbibliothek
Year: 1972
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Die Kollisionsrate als Element des Systemansatzes im Schiffbau
Jordan algebras and orthogonal polynomials
Creators: name: Tsujimoto, Satoshi
name: Vinet, Luc
name: Zhedanov, Alexei
Publisher: name: arXiv
Year: 2011
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 33C45, 33C47, 42C05

description: We illustrate how Jordan algebras can provide a framework for the interpretation of certain classes of orthogonal polynomials. The big -1 Jacobi polynomials are eigenfunctions of a first order operator of Dunkl type. We consider an algebra that has this operator (up to constants) as one of its three generators and whose defining relations are given in terms of anticommutators. It is a special case of the Askey-Wilson algebra AW(3). We show how the structure and recurrence relations of the big -1 Jacobi polynomials are obtained from the representations of this algebra. We also present ladder operators for these polynomials and point out that the big -1 Jacobi polynomials satisfy the Hahn property with respect to a generalized Dunkl operator.
description: 11 pages, 30 references
Aryl Functionalization as a Route to Band Gap Engineering in Single Layer Graphene Devices
Creators: name: Zhang, Hang
name: Bekyarova, Elena
name: Huang, Jhao-Wun
name: Zhao, Zeng
name: Bao, Wenzhong
name: Wang, Fenglin
name: Haddon, Robert C.
name: Lau, Chun Ning
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Chemical functionalization is a promising route to band gap engineering of graphene. We chemically grafted nitrophenyl groups onto exfoliated single-layer graphene sheets in the form of substrate-supported or free-standing films. Our transport measurements demonstrate that non-suspended functionalized graphene behaves as a granular metal, with variable range hopping transport and a mobility gap ~ 0.1 eV at low temperature. For suspended graphene that allows functionalization on both surfaces, we demonstrate tuning of its electronic properties from a granular metal to a gapped semiconductor, in which charge transport occurs via thermal activation over a gap ~ 80 meV. This non-invasive and scalable functionalization technique paves the way for CMOS-compatible band gap engineering of graphene electronic devices.
Profiles of Lymanα Emission Lines
Creators: name: Yamada, T.
name: Matsuda, Y.
name: Kousai, K.
name: Hayashino, T.
name: Morimoto, N.
name: Umemura, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the results of the observations of the Lyα line profiles of 91 emission-line galaxies at z=3.1 with the spectral resolution of λ/δλ(FWHM) = 1700, or 180 km/s. A significant fraction, ~50% of the observed objects show the characteristic double peaks in their Lyαprofile. The red peak is much stronger than the blue one for most of the cases. The red peaks themselves also show weak but significant asymmetry and their widths are correlated with the velocity separation of the red and the blue peaks, which implies that the peaks are not isolated multiple components with different velocities but the parts of the single line which is modified by the absorption and/or scattering by the associated neutral hydrogen gas. The characteristic profile can be naturally explained by the scattering in the expanding shell of neutral hydrogen surrounding the Lyα emitting region while the attenuation by the inter-galactic medium should also be considered. Our results suggest that the star-formation in these Lyα emitters are dominated by the young burst-like events which produce the intrinsic Lyα emission as well as the gas outflow.
description: 15 pages, Accepted for publication in Astrophysical Journal