cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tsetse flies (Glossina morsitans morsitans) choose birthing sites guided by substrate cues with no evidence for a role of pheromones
Creators: name: Adden, Andrea K
name: Haines, Lee R
name: Acosta-Serrano, Álvaro
name: Prieto-Godino, Lucia L
Publisher: name: The Francis Crick Institute
Year: 2023
Subjects: subject: Neurosciences
subject: FOS: Clinical medicine
subject: Imaging
subject: Genetics & Genomics
subject: Developmental Biology
subject: Ecology,Evolution & Ethology

description: Tsetse flies significantly impact public health and economic development in sub-Saharan African countries by transmitting the fatal disease African trypanosomiasis. Unusually, instead of laying eggs, tsetse birth a single larva that immediately burrows into the soil to pupate. Where the female chooses to larviposit is, therefore, crucial for offspring survival. Previous laboratory studies suggested that a putative larval pheromone, n-pentadecane, attracts gravid female Glossina morsitans morsitans to appropriate larviposition sites. However, this attraction could not be reproduced in field experiments. Here, we resolve this disparity by designing naturalistic laboratory experiments that closely mimic the physical characteristics found in the wild. We show that gravid G. m. morsitans were neither attracted to the putative pheromone nor, interestingly, to pupae placed in the soil. By contrast, females appear to choose larviposition sites based on environmental substrate cues. We conclude that, among the many cues that likely contribute to larviposition choice in nature, substrate features are a main determinant, while we failed to find evidence for a role of pheromones.
Enhancing the performance of silicon photonics biosensors
Creators: name: Flueckiger, Jonas
Publisher: name: University of British Columbia
Year: 2017

description: Silicon photonic biosensors have the potential to transform medical diagnostics and healthcare delivery. Hundreds of these nano-scale sensors can be integrated onto a single millimeter-sized silicon substrate. They are fabricated in established CMOS foundries leveraging similar economies-of-scale achieved by electronic integrated circuits. This also enables their potential integration with electronic read out circuitry on a single chip. As near-infrared light propagates through nanoscale silicon wires, a portion of the light resides outside the waveguide interacting with biomolecules on the waveguide’s surface. While silicon photonic biosensors have demonstrated performances approaching today’s gold-standard diagnostic, the enzyme-linked immunosorbent assay (ELISA), improving their performance expands the potential use for applications requiring higher sensitivities and detection limits. To this end, this thesis describes efforts to optimize established biosensor configurations and develop novel structures with performance that exceeds commercially available silicon photonic biosensor platforms. This involves improving the bulk and surface sensitivity, detection limit, and quality factor of transverse electric (TE) and magnetic (TM) mode resonators in various waveguide topologies. Specifically, TM mode microring resonators, microdisk resonators, thin waveguide resonators, and the first of its kind sub-wavelength grating microring resonator with a 10X sensitivity improvement over today’s commercially available ring resonators are presented. Furthermore the use novel TE mode slot-waveguide and TM mode strip waveguide Bragg gratings which facilitate higher sensitivities (8X) and lower detection limits for biosensing applications are described. Finally, suspended Bragg grating structures are investigated to further improve sensitivity. To support the design and characterization efforts required to efficiently investigate many different sensors, a testing platform and process design kit (PDK) was developed. The test platform automatically tests hundreds of devices and orchestrates complex, multi-hour assays. The PDK reduces first-time design risk and expedites chip testing. Both have been open-sourced and are in use by more than a dozen academic and commercial research groups in various countries.
Investigation and Modeling of Heterogeneously Catalyzed G/L Reactions in Microreactors
Creators: name: Özkan, Furkan
Publisher: name: Karlsruhe
Year: 2013

description: Missing physical parameters such as the static contact angle of hydrogen/nitrobenzene on stainless steel and on a carbon surface was measured using a static droplet method. Influence of surface tension, geometrical properties, and static contact angle on the chosen two phase flow have been explored in a microchannel using VOF method. One of the main goals of this work was to the model mass transfer from gas to liquid phase while coupling this with the volume change in the gas phase.
Efficient Radio Frequency filters for space constrained cryogenic set-ups
Creators: name: Mandal, Soumen
name: Bautze, Tobias
name: Blinder, Remi
name: Meunier, Tristan
name: Saminadayar, Laurent
name: Bäuerle, Christopher
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Noise filtering is an essential part for measurement of quantum phenomena at extremely low temperatures. Here, we present the design of a filter which can be installed in space constrained cryogenic environment containing a large number of signal carrying lines. Our filters have a -3db point of 65kHz and its performance at GHz frequencies are comparable to the best available RF filters.
description: 9 pages, 4 figures, The capacitor reference in the first version was wrong and has been changed to the right one
Constituting the Australian environment : the transition of political responsibility for the environment in Australia from state to federal government, 1974 - 1983
Creators: name: Allen, Blake
Publisher: name: University of British Columbia
Year: 2017

description: Between 1974 and 1983 the Australian federal government, responding to the increasing demands of grassroots activists, passed a series of legislation that successfully altered the federal relationship in Australia by transferring political responsibility for the environment from the state governments to the federal government in Canberra. To better illustrate this process, this thesis will utilize Tasmania as an emblematic case study. The first part of this thesis is a social history that analyzes the development of environmental consciousness in Tasmania. This analysis spans from the cultural impact of the extinction of the thylacine (Thylacinus cynocephalus) on the island populace and culminates in the well-documented protests against the damming of the Serpentine and Franklin Rivers. This analysis will illustrate the failures of the state government to address public concerns and how this facilitated the transition of the focus of lobbying from the state to the federal level. The second part of this thesis is a legal history, looking at the legislation that was passed during this period that facilitated the transfer and explains the constitutional basis and effectiveness of the legislation. Through these two separate studies, this thesis will expand the existing Australian historiography, which has largely kept political and social analyses of the environmental movement separated, by integrating the two historical narratives. This thesis offers three contributions to Australian historiography. First, this research shows that the constitutional reformation that occurred under the governments of Gough Whitlam, Malcolm Fraser, and Bob Hawke was driven not by government initiative but, rather, by grassroots demands, and illustrate a need to further integrate the studies of social and political history so as to better pursue the histoire totale of Australia. Second, this thesis also helps contribute to the still nascent study of extinction’s socio-cultural impact on human societies with its particular emphasis on the extinction of the thylacine as the genesis of Tasmanian environmentalism. Third, it offers a detailed legal dissection of the federal government’s early environmental legislation and the constitutional foundations for Canberra’s acquisition of this responsibility.
Apport du Contrôle de Gestion à la Régulation des Systèmes de Comportement : Une Étude du Contexte Marocain
Creators: name: Elhassane Aamri
name: Si Mohamed BOUAZIZ
Publisher: name: Zenodo
Year: 2025

description: Cet article examine l’apport du contrôle de gestion à la régulation des systèmes de comportement dans les entreprises marocaines, en s’appuyant sur l’apprentissage organisationnel comme mécanisme médiateur. À partir d’une revue théorique, le contrôle de gestion est repositionné comme un levier stratégique (Simons, 1995) favorisant l’adaptation comportementale, au-delà de sa fonction classique de surveillance (Anthony, 1965). Une étude empirique menée auprès de 214 entreprises de la région Souss-Massa teste cette hypothèse via une approche hypothético-déductive et une modélisation par équations structurelles (PLS-SEM). Les résultats confirment un effet positif et significatif du contrôle de gestion sur la régulation des comportements (β = 0,388, p < 0,001), mesurée par l’engagement envers l’apprentissage (β = 0,336), la vision partagée (β = 0,314), et l’ouverture d’esprit (β = 0,303). Si les outils de suivi et de prévision dominent, les outils d’analyse, moins adoptés, révèlent un potentiel d’amélioration. Dans le contexte marocain, marqué par une prédominance des PME, ces findings enrichissent les théories des capacités dynamiques (Teece et al., 1997) et soulignent le rôle du contrôle dans l’adaptabilité organisationnelle. Des recommandations pratiques et des pistes pour approfondir cette dynamique sont proposées.
Spectral stability of vortices in two-dimensional Bose-Einstein condensates via the Evans function and Krein signature
Creators: name: Kollár, Richard
name: Pego, Robert L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35Q55, 35L70, 35B35, 35B40, 35P15, 37K45, 81V45

description: We investigate spectral stability of vortex solutions of the Gross-Pitaevskii equation, a mean-field approximation for Bose-Einstein condensates (BEC) in an effectively two-dimensional axisymmetric harmonic trap. We study eigenvalues of the linearization both rigorously and through computation of the Evans function, a sensitive and robust technique whose use we justify mathematically. The absence of unstable eigenvalues is justified a posteriori through use of the Krein signature of purely imaginary eigenvalues, which also can be used to significantly reduce computational effort. In particular, we prove general basic continuation results on Krein signature for finite systems of eigenvalues in infinite-dimensional problems.
description: 45 pages, 7 figures
Thrust at N^3LL with Power Corrections and a Precision Global Fit for alphas(mZ)
Creators: name: Abbate, Riccardo
name: Fickinger, Michael
name: Hoang, Andre H.
name: Mateu, Vicent
name: Stewart, Iain W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We give a factorization formula for the e+e- thrust distribution dsigma/dtau with tau=1-T based on soft-collinear effective theory. The result is applicable for all tau, i.e. in the peak, tail, and far-tail regions. The formula includes O(alphas^3) fixed-order QCD results, resummation of singular partonic alphas^j ln^k(tau)/tau terms with N^3LL accuracy, hadronization effects from fitting a universal nonperturbative soft function defined in field theory, bottom quark mass effects, QED corrections, and the dominant top mass dependent terms from the axial anomaly. We do not rely on Monte Carlo generators to determine nonperturbative effects since they are not compatible with higher order perturbative analyses. Instead our treatment is based on fitting nonperturbative matrix elements in field theory, which are moments Omega_i of a nonperturbative soft function. We present a global analysis of all available thrust data measured at center-of-mass energies Q=35 to 207 GeV in the tail region, where a two parameter fit to $α_s(m_Z)$ and the first moment Omega_1 suffices. We use a short distance scheme to define Omega_1, called the R-gap scheme, thus ensuring that the perturbative dsigma/dtau does not suffer from an O(Lambda_QCD) renormalon ambiguity. We find alphas(mZ)=0.1135 \pm (0.0002)_{expt} \pm (0.0005)_{hadr} \pm (0.0009)_{pert}, with chi^2/dof=0.91, where the displayed 1-sigma errors are the total experimental error, the hadronization uncertainty, and the perturbative theory uncertainty, respectively. The hadronization uncertainty in alphas is significantly decreased compared to earlier analyses by our two parameter fit, which determines Omega_1=0.323 GeV with 16% uncertainty.
description: 45 pages, 21 figures, v2: added discussion of bin integration vs. cumulant differences; comparison to Becher & Schwartz improved; typo in Eq.55 fixed
Minimal Modification to Tri-bimaximal Mixing
Creators: name: He, Xiao-Gang
name: Zee, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We explore some ways of minimally modifying the neutrino mixing matrix from tribimaximal, characterized by introducing at most one mixing angle and a CP violating phase thus extending our earlier work. One minimal modification, motivated to some extent by group theoretic considerations, is a simple case with the elements $V_{α2}$ of the second column in the mixing matrix equal to $1/\sqrt{3}$. Modifications by keeping one of the columns or one of the rows unchanged from tri-bimaximal mixing all belong to the class of minimal modification. Some of the cases have interesting experimentally testable consequences. In particular, the T2K and MINOS collaborations have recently reported indications of a non-zero $θ_{13}$. For the cases we consider, the new data sharply constrain the CP violating phase angle $δ$, with $δ$ close to 0 (in some cases) and $π$ disfavored.
description: Latex 21 pages with 9 figures. Updated analysis with new combined data
Relativistic Drude Response of Photoexcited Dirac Quasiparticles in Graphene
Creators: name: Dani, K. M.
name: Lee, J.
name: Sharma, R.
name: Mohite, A. D.
name: Galande, C. M.
name: Ajayan, P. M.
name: Dattelbaum, A. M.
name: Htoon, H.
name: Taylor, A. J.
name: Prasankumar, R. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Graphene, a monolayer of carbon atoms arranged in a hexagonal pattern, provides a unique two-dimensional (2D) system exhibiting exotic phenomena such as quantum Hall effects, massless Dirac quasiparticle excitations and universal absorption & conductivity. The linear energy-momentum dispersion relation in graphene also offers the opportunity to mimic the physics of far-away relativistic particles like neutron stars and white dwarfs. In this letter, we perform a counterintuitive ultrafast pump-probe experiment with high photon energies to isolate the Drude-like intraband dynamics of photoexcited carriers. We directly demonstrate the relativistic nature of the photoexcited Dirac quasiparticles by observing a nonlinear scaling of the response with the density of photoexcited carriers. This is in striking contrast to the linear scaling that is usually observed in conventional materials. Our results also indicate strong electron-phonon coupling in graphene, leading to a sub-100 femtosecond thermalization between high energy photoexcited carriers and optical phonons.
description: Withdrawn for revisions
Ein System zur Analyse haptischer Eigenschaften von Benutzerschnittstellen
Creators: name: Braun, Daniel
Publisher: name: Karlsruhe
Year: 2012
Subjects: Haptik
Haptikanalyse

description: Diese Dissertation beschreibt ein System für die Analyse haptischer Eigenschaften von Benutzerschnittstellen. Nach einer Einführung in die Problemstellung und der Vorstellung eines Analyseframeworks wird die Implementierung eines beispielhaften Analysesystems für Schalter und die Implementierung eines psychophysikalischen Modells vorgenommen.
Semi-device-independent bounds on entanglement
Creators: name: Liang, Yeong-Cherng
name: Vertesi, Tamas
name: Brunner, Nicolas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Detection and quantification of entanglement in quantum resources are two key steps in the implementation of various quantum-information processing tasks. Here, we show that Bell-type inequalities are not only useful in verifying the presence of entanglement but can also be used to bound the entanglement of the underlying physical system. Our main tool consists of a family of Clauser-Horne-like Bell inequalities that cannot be violated maximally by any finite-dimensional maximally entangled state. Using these inequalities, we demonstrate the explicit construction of both lower and upper bounds on the concurrence for two-qubit states. The fact that these bounds arise from Bell-type inequalities also allows them to be obtained in a semi-device-independent manner, that is, with assumption of the dimension of the Hilbert space but without resorting to any knowledge of the actual measurements being performed on the individual subsystems.
description: 8 pages, 2 figures (published version). Note 1: Title changed to distinguish our approach from the standard device-independent scenario where no assumption on the Hilbert space dimension is made. Note 2: This paper contains explicit examples of more nonlocality with less entanglement in the simplest CH-like scenario (see also arXiv:1011.5206 by Vidick and Wehner for related results)
Termination of Rewriting with Right-Flat Rules Modulo Permutative Theories
Creators: name: Barguno, Luis
name: Godoy, Guillem
name: Huntingford, Eduard
name: Tiwari, Ashish
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.4.2

description: We present decidability results for termination of classes of term rewriting systems modulo permutative theories. Termination and innermost termination modulo permutative theories are shown to be decidable for term rewrite systems (TRS) whose right-hand side terms are restricted to be shallow (variables occur at depth at most one) and linear (each variable occurs at most once). Innermost termination modulo permutative theories is also shown to be decidable for shallow TRS. We first show that a shallow TRS can be transformed into a flat (only variables and constants occur at depth one) TRS while preserving termination and innermost termination. The decidability results are then proved by showing that (a) for right-flat right-linear (flat) TRS, non-termination (respectively, innermost non-termination) implies non-termination starting from flat terms, and (b) for right-flat TRS, the existence of non-terminating derivations starting from a given term is decidable. On the negative side, we show PSPACE-hardness of termination and innermost termination for shallow right-linear TRS, and undecidability of termination for flat TRS.
description: 20 pages
Production and characterization of biomass fast pyrolysis oil blends for combustion testing as drop-in fuel alternatives in a single cylinder diesel engine
Creators: name: Laesecke, Jan
Publisher: name: University of British Columbia
Year: 2017

description: This research sought to demonstrate the potential of biodiesel and softwood derived Fast Pyrolysis Oil (FPO) blends as an alternative low-carbon drop-in diesel fuel. FPO was supplied from an in-house fluidized bed reactor as well as a commercial source. Separate FPO-biodiesel blends from both FPO sources were prepared using initial volumetric ratios of 80:20 and 60:40 (biodiesel:FPO, by volume). Upon blending each performed volumetric ratio, mixing and a 24 hour settling period, two layers formed and the top, biodiesel-rich layers containing about 5 and 10 vol % FPO were decanted and characterized on the basis of a thermogravimetric analysis, viscosity, acid number, water content, elemental analysis, and heating value. Significant decreases in viscosity, acidity, and water content from the original FPO validated blending as means of extracting compounds suitable for use as fuels from pyrolytic liquids in biodiesel. A single cylinder, direct injection diesel engine was used to analyze the combustion performance of the FPO fuel blends against neat diesel and biodiesel. Fuel performance was characterized on the basis of a thermodynamic analysis and corresponding exhaust measurements for CO₂, CO, unburned hydrocarbons, particulate matter, and NOx. Two thermodynamic measurement campaigns were performed in order to provide insight into FPO fuel performance across various engine conditions. In addition to the thermodynamic measurements, in-cylinder high-speed photography was implemented to support the interpretation of thermodynamic combustion data. Engine testing revealed similar indicated efficiencies for biodiesel and diesel at all considered engine-operating modes, while blend fuels showed indicated efficiencies between 75 and 95% of diesel values. FPO fuels exhibited increased ignition delays and shorter combustion durations with greater FPO blend concentrations, though this could be partially compensated for using a pilot injection strategy. The longer ignition delays of the blend fuels resulted in overly lean regions of the cylinder, which produced largely premixed combustion events contributing to brake specific CO and uHC emissions up to 1.5 and 3.5 greater than diesel, respectively. Specific PM emissions were 41-62% lower for blend fuels than diesel. Both blends of in-house FPO showed similar PM emission performance, however at higher concentrations than low blend commercial fuel.
The Emission by Dust and Stars of Nearby Galaxies in the Herschel KINGFISH Survey
Creators: name: Skibba, Ramin A.
name: Engelbracht, Charles W.
name: Dale, Daniel
name: Hinz, Joannah
name: Zibetti, Stefano
name: Crocker, Alison
name: Groves, Brent
name: Hunt, Leslie
name: Johnson, Benjamin D.
name: Meidt, Sharon
name: Murphy, Eric J.
name: Appleton, Philip
name: Armus, Lee
name: Bolatto, Alberto
name: Brandl, Bernhard
name: Calzetti, Daniela
name: Croxall, Kevin
name: Galametz, Maud
name: Gordon, Karl D.
name: Kennicutt, Robert C.
name: Koda, Jin
name: Krause, Oliver
name: Montiel, Edward
name: Rix, Hans-Walter
name: Roussel, Helene
name: Sandstrom, Karin
name: Sauvage, Marc
name: Schinnerer, Eva
name: Smith, J. D.
name: Walter, Fabian
name: Wilson, Christine D.
name: Wolfire, Mark
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using new far-infrared imaging from the Herschel Space Observatory with ancillary data from ultraviolet to submillimeter wavelengths, we estimate the total emission from dust and stars of 62 nearby galaxies in the KINGFISH survey in a way that is as empirical and model-independent as possible. We collect and exploit these data in order to measure from the spectral energy distributions (SEDs) precisely how much stellar radiation is intercepted and re-radiated by dust, and how this quantity varies with galaxy properties. By including SPIRE data, we are more sensitive to emission from cold dust grains than previous analyses at shorter wavelengths, allowing for more accurate estimates of dust temperatures and masses. The dust/stellar flux ratio, which we measure by integrating the SEDs, has a range of nearly three decades. The inclusion of SPIRE data shows that estimates based on data not reaching these far-IR wavelengths are biased low. We find that the dust/stellar flux ratio varies with morphology and total IR luminosity. We also find that dust/stellar flux ratios are related to gas-phase metallicity, while the dust/stellar mass ratios are less so. The substantial scatter between dust/stellar flux and dust/stellar mass indicates that the former is a poor proxy of the latter. Comparing the dust/stellar flux ratios and dust temperatures, we show that early-types tend to have slightly warmer temperatures than spiral galaxies, which may be due to more intense interstellar radiation fields, or to different dust grain compositions. Finally, we show that early-types and early-type spirals have a strong correlation between the dust/stellar flux ratio and specific star formation rate, which suggests that the relatively bright far-IR emission of some of these galaxies is due to ongoing star formation and the radiation field from older stars.
description: 19 pages, 12 figures; published in ApJ
Long gravitational-wave transients and associated detection strategies for a network of terrestrial interferometers
Creators: name: Thrane, Eric
name: Kandhasamy, Shivaraj
name: Ott, Christian D
name: Anderson, Warren G
name: Christensen, Nelson L
name: Coughlin, Michael W
name: Dorsher, Steven
name: Giampanis, Stefanos
name: Mandic, Vuk
name: Mytidis, Antonis
name: Prestegard, Tanner
name: Raffai, Peter
name: Whiting, Bernard
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Searches for gravitational waves (GWs) traditionally focus on persistent sources (e.g., pulsars or the stochastic background) or on transients sources (e.g., compact binary inspirals or core-collapse supernovae), which last for timescales of milliseconds to seconds. We explore the possibility of long GW transients with unknown waveforms lasting from many seconds to weeks. We propose a novel analysis technique to bridge the gap between short O(s) burst analyses and persistent stochastic analyses. Our technique utilizes frequency-time maps of GW strain cross-power between two spatially separated terrestrial GW detectors. The application of our cross-power statistic to searches for GW transients is framed as a pattern recognition problem, and we discuss several pattern-recognition techniques. We demonstrate these techniques by recovering simulated GW signals in simulated detector noise. We also recover environmental noise artifacts, thereby demonstrating a novel technique for the identification of such artifacts in GW interferometers. We compare the efficiency of this framework to other techniques such as matched filtering.
Isothermes und thermisch-mechanisches Ermüdungsverhalten von Verbundwerkstoffen mit Durchdringungsgefüge (Preform-MMCs)
Creators: name: Ulrich, Oliver
Publisher: name: Karlsruhe
Year: 2012
Subjects: Metal-Matrix-Composites (MMCs)
Metall-Keramik-Verbundwerkstoffe
Preform-MMCs
Thermal-mechanical fatigue (TMF)
Ermüdung

description: Die Arbeit befasst sich mit der Untersuchung des Ermüdungsverhaltens von Metallmatrix-Verbundwerkstoffen (MMCs) mit Keramikanteilen zwischen 30 und 39 Vol-%. Basis für die MMCs sind offenporige Keramikvorkörper, sogenannte Preforms, die mit einer handelsüblichen Aluminiumlegierung infiltriert wurden. Zur Charakterisierung des Wechselverformungs- und Lebensdauerverhaltens der Preform-MMCs wurden isotherme Wechselverformungsversuche sowie TMF-Versuche durchgeführt.
Synchronized material deposition rate control with path velocity on fused deposition machines
Creators: name: Ertay, Deniz Sera
Publisher: name: University of British Columbia
Year: 2017

description: Additive manufacturing (AM) technologies are used in three-dimensional (3D) printing of parts by depositing the material layer-by-layer on the computer numerical controlled machine tools. While laser and electron beam guns are used to melt, and deposit the metals, thermoplastic materials are heated and deposited by the extruders. When the material deposition is not synchronized with the tangential velocity of the machine, an excess material is accumulated at sharp curvatures where the machine slows down. This thesis presents a novel algorithm for the synchronized deposition of thermo-plastic materials with the tangential path velocity of the machine under constant temperature. The temperature of the thermoplastic filament needs to be kept at a constant temperature (i.e. 220 Celsius) in a heater chamber. The transfer function of the temperature and current input to the heater is modelled as a first order system whose parameters are time varying as a function of material’s extrusion rate. An adaptive pole placement controller is designed to maintain the temperature of the material by manipulating the current supply to the heater as the extrusion rate vary. The tool path is first smoothed by a fifth order B-spline. The tangential path velocity is also smoothed by a third order spline while respecting heater’s power limit as well as the jerk, acceleration and velocity limits of two drives which are used in printing the material layer by layer. The extrusion rate is controlled proportionally to the tangential path velocity while keeping the temperature of the deposited thermo-plastic material at the desired temperature by adaptively controlling current supply to the heater. The experimentally proven algorithm leads to more uniform material deposition at sharp curvatures and resulting improved dimensional accuracy of printed parts. The proposed methodology can be extended to laser and electron beam based metal printing applications.
Krieg, Kamera, Kunst - Krisenberichterstattung im Kunstmuseum
Creators: name: Knoll, Nina
Publisher: name: Karlsruhe
Year: 2012
Subjects: Pressefotografie
Medienbild im Kunstraum

description: Werden Pressebilder aus dem Krieg im Kunstmuseum gezeigt, führt die Neukontextualisierung zu einer Wahrnehmungsänderung. Verantwortlich ist hierfür das Doppelpotenzial der Fotografie: sie kann zum einen als Dokument, gleichzeitig als Kunstwerk wahrgenommen werden. Die Lesbarkeit ist von der topologischen Differenz von Nachrichtenmedium und Kunstmuseum abhängig, denn diese Bildorte werden durch Praktiken und Diskurse mit und über Bilder geformt oder auch erst geschaffen.
Deterministic spin-wave interferometer based on Rydberg blockade
Creators: name: Wei, Ran
name: Zhao, Bo
name: Deng, Youjin
name: Chen, Yu-Ao
name: Pan, Jian-Wei
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The spin-wave (SW) NOON state is an $N$-particle Fock state with two atomic spin-wave modes maximally entangled. Attributed to the property that the phase is sensitive to collective atomic motion, the SW NOON state can be utilized as a novel atomic interferometer and has promising application in quantum enhanced measurement. In this paper we propose an efficient protocol to deterministically produce the atomic SW NOON state by employing Rydberg blockade. Possible errors in practical manipulations are analyzed. A feasible experimental scheme is suggested. Our scheme is far more efficient than the recent experimentally demonstrated one, which only creates a heralded second-order SW NOON state.
description: 5 pages, 2 figures
Supplementary Information from Face coverings and respiratory tract droplet dispersion
Creators: name: Bandiera, Lucia
name: Geethanjali Pavar
name: Pisetta, Gabriele
name: Otomo, Shuji
name: Mangano, Enzo
name: Seckl, Jonathan R.
name: Digard, Paul
name: Molinari, Emanuela
name: Menolascina, Filippo
name: Viola, Ignazio Maria
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Health Care
subject: Diseases
subject: 111706 Epidemiology
subject: FOS: Health sciences
subject: 90399 Biomedical Engineering not elsewhere classified
subject: FOS: Medical engineering
subject: 91504 Fluidisation and Fluid Mechanics
subject: FOS: Other engineering and technologies

description: Respiratory droplets are the primary transmission route for SARS-CoV-2, a principle which drives social distancing guidelines. Evidence suggests that virus transmission can be reduced by face coverings, but robust evidence for how mask usage might affect safe distancing parameters is lacking. Accordingly, we set out to quantify the effects of face coverings on respiratory tract droplet deposition. We tested an anatomically realistic manikin head which ejected fluorescent droplets of water and human volunteers, in speaking and coughing conditions without a face covering, or with a surgical mask or a single-layer cotton face covering. We quantified the number of droplets in flight using laser sheet illumination and UV-light for those that had landed at table height at up to 2 m. For human volunteers, expiratory droplets were caught on a microscope slide 5 cm from the mouth. Whether manikin or human, wearing a face covering decreased the number of projected droplets by less than 1000-fold. We estimated that a person standing 2 m from someone coughing without a mask is exposed to over 10 000 times more respiratory droplets than from someone standing 0.5 m away wearing a basic single-layer mask. Our results indicate that face coverings show consistent efficacy at blocking respiratory droplets and thus provide an opportunity to moderate social distancing policies. However, the methodologies we employed mostly detect larger (non-aerosol) sized droplets. If the aerosol transmission is later determined to be a significant driver of infection, then our findings may overestimate the effectiveness of face coverings.
Antioxidant effect of Cymbopogon citratus and Hypericum perforatum in boar semen like a new alternative for it conservation
Creators: name: Guerrero, Andrea
Publisher: name: figshare
Year: 2021
Subjects: subject: 70206 Animal Reproduction
subject: FOS: Animal and dairy science

description: Viability, motility and seminal morphology of boar sperm with Cymbopogon citratus, Hypericum perforatum and BTS.
Quantum correlations in spin chains at finite temperatures and quantum phase transitions
Creators: name: Werlang, T.
name: Trippe, C.
name: Ribeiro, G. A. P.
name: Rigolin, Gustavo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We compute the quantum correlation (quantum discord (QD)) and the entanglement (EoF) between nearest neighbor qubits (spin-1/2) in an infinite chain described by the Heisenberg model (XXZ Hamiltonian) at finite temperatures. The chain is in the thermodynamic limit and thermalized with a reservoir at temperature T (canonical ensemble). We show that QD, in contrast to EoF and other thermodynamic quantities, spotlight the critical points associated to quantum phase transitions (QPT) for this model even at finite T. This remarkable property of QD may have important implications for experimental characterization of QPTs when one is unable to reach temperatures below which a QPT can be seen.
description: 4 pages, 4 figures, RevTex4-1; v2: published version
Arbejdsmiljø og helbred i Danmark
Creators: Det Nationale Forskningscenter for Arbejdsmiljø, Peter Linde
Publisher: name: Rigsarkivet
Year: 2023

description: Det Nationale Forskningscenter for Arbejdsmiljø (NFA)har som et af sine hovedformål at monitorere forhold i arbejdsmiljøet af betydning for sikkerhed og sundhed, herunder også trivsel, arbejdsevne og fastholdelse på arbejdsmarkedet. Monitoreringen skal følge udviklingen i arbejdsmiljøet over tid, samt belyse effekter af forebyggelses- og sundhedsfremmeforanstaltninger og baseres på surveys, der dækker forhold af central betydning for opfyldelsen af arbejdsmiljøstrategiens mål.
Game semantics for first-order logic
Creators: name: Laurent, Olivier
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.3.2, F.4.1, F.3.3

description: We refine HO/N game semantics with an additional notion of pointer (mu-pointers) and extend it to first-order classical logic with completeness results. We use a Church style extension of Parigot's lambda-mu-calculus to represent proofs of first-order classical logic. We present some relations with Krivine's classical realizability and applications to type isomorphisms.
Antioxidant effect of Cymbopogon citratus and Hypericum perforatum in boar semen like a new alternative for it conservation .docx
Creators: name: Guerrero, Andrea
Publisher: name: figshare
Year: 2020
Subjects: subject: 70206 Animal Reproduction
subject: FOS: Animal and dairy science

description: Viability, motility and seminal morphology of boar sperm with Cymbopogon citratus, Hypericum perforatum and BTS.
High speed spatially multimode atomic memory
Creators: name: Golubeva, T.
name: Golubev, Yu.
name: Mishina, O.
name: Bramati, A.
name: Laurat, J.
name: Giacobino, E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the coherent storage and retrieval of a very short multimode light pulse in an atomic ensemble. We consider a quantum memory process based on the conversion of a signal pulse into a long-lived spin coherence via light matter interaction in an on-resonant Lambda-type system. In order to study the writing and reading processes we analytically solve the partial differential equations describing the evolution of the field and of the atomic coherence in time as well as in space. We show how to optimize the process for writing as well as for reading. If the medium length is fixed, for each length, there is an optimal value of the pulse duration. We discuss the information capacity of this memory scheme and we estimate the number of transverse modes that can be stored as a quantum hologram.
description: 13 pages, 8 figures, submitted to Phys.Rev.A
Dynamic Screening and Low Energy Collective Modes in Bilayer Graphene
Creators: name: Sensarma, Rajdeep
name: Hwang, E. H.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically study the dynamic screening properties of bilayer graphene within the random phase approximation assuming quadratic band dispersion and zero gap for the single-particle spectrum. We calculate the frequency dependent dielectric function of the system and obtain the low energy plasmon dispersion and broadening of the plasmon modes from the dielectric function. We also calculate the optical spectral weight (i.e. the dynamical structure factor) for the system. We find that the leading order long wavelength limit of the plasmon dispersion matches with the classical result for 2D electron gas. However, contrary to electron gas systems, the non-local plasmon dispersion corrections decrease the plasmon frequency. The non-local corrections are also different from the single layer graphene. Finally, we also compare our results with the double layer graphene system (i.e. a system of two independent graphene monolayers).
description: Typos corrected in equations, expanded discussion, new section on crossover from bilayer to single layer behaviour, new figures added. 10 pages 8 Figures
Haptische Objekterkennung mit einer humanoiden Roboterhand
Creators: name: Gorges, Nicolas
Publisher: name: Karlsruhe
Year: 2012

description: Der Fokus dieser Arbeit liegt auf der Analyse haptischer Sensordaten einer humanoiden Roboterhand mit dem Ziel der Erkennung der Objektform. Der Leitfaden ist dabei die Betrachtung unterschiedlicher Fusionsansätze für haptische Sensordaten, mit denen sich Objekte sowohl grob in wenigen als auch detailliert mit mehreren Abtastungen unterscheiden lassen. Ein Teil des vorgestellten Systems ist ein Aufmerksamkeitsraum, der eine Abtaststrategie und damit eine aktive Klassifikation ermöglicht.
Plurilingual and pluricultural subject positioning of plurilingual students in a Francophone minority school in British Columbia
Creators: name: Brisson, Geneviève
Publisher: name: University of British Columbia
Year: 2017

description: In this qualitative case study, I explored the process of identity construction of plurilingual students attending a Francophone minority school in British Columbia. Using a theoretical framework informed by a sociocultural perspective on literacies (Barton & Hamilton, 2000; Street, 1984), positioning theories of identity (Davies & Harré, 1990; Blackledge & Pavlenko, 2001), plurilingualism and pluricultural competence (Marshall & Moore, 2013; Moore, 2006), and multimodality (Cope & Kalantzis, 2000; Kress, 2000a, 2000b), I investigated how focal students negotiated multiple subject positions as plurilingual and pluricultural in the context of literacy events in a classroom. My analysis focused on their use of linguistic and cultural resources in their oral interactions, and on their use of modes of representation in their digital multimodal texts. I gathered data through ethnographic methods, and I also collected multimodal digital texts. My analysis of literacy events allowed for identification of “moments of positioning” as plurilingual and pluricultural, in which students activated some of their linguistic and cultural resources, and/or modes of representation to negotiate multiple subject positions. This study of moments of positioning provides a close analysis of factors inhibiting the expression and recognition of some subject positions as legitimate in the classroom. For instance, the monolingual school Discourse – with an upper case D, as conceptualized by Gee (1996, 2001, 2005) – may limit the negotiation of plurilingual and pluricultural subject positions. This study makes significant contributions to research on identity in the fields of literacy and language learning, and in the research on identity in Francophone minority schools. It shows how a Discourse might lead students to express some of their subject positions in their classroom setting, and not others. My analysis of moments of positioning supports current poststructuralist views of identity as dynamic, fluid, and performed in interactions and adds to research demonstrating that subject positions are not stable entities negotiated once and acquired forever (Blackledge & Pavlenko, 2001). In the field of research on multimodality, my research adds to the literature arguing that multimodality can be a powerful tool that children can use when they create texts in which they negotiate subject positions.
A Search for the Fourth SM Family: Tevatron still has a Chance
Creators: name: Sahin, M.
name: Sultansoy, S.
name: Turkoz, S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Existence of the fourth family follows from the basics of the Standard Model and the actual mass spectrum of the third family fermions. We discuss possible manifestations of the fourth SM family at existing and future colliders. The LHC and Tevatron potentials to discover the fourth SM family have been compared. The scenario with dominance of the anomalous decay modes of the fourth family quarks has been considered in details.
description: 31 pages, 24 figures and 12 tables
Analysis of tremor at the San Andreas Fault at Parkfield
Creators: name: Horstmann, Tobias
Publisher: name: Karlsruhe
Year: 2013
Subjects: tremor
neural networks
Self Organizing Maps (SOM)
time-reversal imaging (TRI)

description: Emergent phase arrivals, low amplitude waveforms, and variable event durations make detection and location of tectonic tremor a non-trivial task. In this work I employ a new method to identify tremor in large datasets using a semi-automated technique, which is comprised of an envelope cross-correlation and a Self-Organizing Map (SOM) algorithm to identify and classify event types. Furthermore, I present a new tremor localization method based on time-reversal imaging techniques.
Electric Vehicle Charging Coordination - Economics of Renewable Energy Integration
Creators: name: Schuller, Alexander
Publisher: name: Karlsruhe
Year: 2013
Subjects: electric vehicle
charging coordination
renewables

description: This work investigates the potential application of EV load flexibility with respect to different coordination objectives. They include individual cost or conventional generator use minimization, given volatile supply from renewable sources. The evaluation shows that charging coordination can generate savings and increase the direct utilization of renewable energy sources. Allowing for resale of stored energy to the grid can further increase savings but is limited by battery wear conditions.
Collider signatures of sterile neutrinos in models with a gauge-singlet Higgs
Creators: name: Shoemaker, Ian M.
name: Petraki, Kalliopi
name: Kusenko, Alexander
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Sterile neutrinos have been invoked to explain the observed neutrino masses, but they can also have significant implications for cosmology and accelerator experiments. We explore the collider signatures of a simple extension of the Standard Model, where sterile neutrinos acquire their mass after electroweak symmetry breaking, via their coupling to a real singlet Higgs. In this model, heavy sterile neutrinos can be produced in accelerators from decays of the Higgs bosons. Their own decay can yield distinct signals, suggesting both the presence of an extended Higgs sector and the coupling of the singlet fermions to the latter. In the same scenario, a relic matter abundance arises from the decay of the singlet Higgs into weakly coupled keV sterile neutrinos. The coupling of the Higgs doublet to particles outside the Standard Model relaxes the current experimental bounds on its mass.
description: v2: JHEP accepted version, 19 pages, 9 figures
Prospects for sympathetic cooling of molecules in electrostatic, ac and microwave traps
Creators: name: Tokunaga, S. K.
name: Skomorowski, Wojciech
name: Żuchowski, Piotr S.
name: Moszynski, Robert
name: Hutson, Jeremy M.
name: Hinds, E. A.
name: Tarbutt, M. R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We consider how trapped molecules can be sympathetically cooled by ultracold atoms. As a prototypical system, we study LiH molecules co-trapped with ultracold Li atoms. We calculate the elastic and inelastic collision cross sections of LiH + Li with the molecules initially in the ground state and in the first rotationally excited state. We then use these cross sections to simulate sympathetic cooling in a static electric trap, an ac electric trap, and a microwave trap. In the static trap we find that inelastic losses are too great for cooling to be feasible for this system. The ac and microwave traps confine ground-state molecules, and so inelastic losses are suppressed. However, collisions in the ac trap can take molecules from stable trajectories to unstable ones and so sympathetic cooling is accompanied by trap loss. In the microwave trap there are no such losses and sympathetic cooling should be possible.
description: 9 pages, 10 figures, minor revisions following referee suggestions
Modellbasierte Entzerrung von Analog/Digital-Wandler-Systemen
Creators: name: Vallant, Georg Johannes
Publisher: name: Karlsruhe
Year: 2013

description: Software Defined Radio/Radar ist als Kennzeichnung moderner Kommunikations- und Radarsysteme ein stehender Begriff geworden. Auf diesem Weg stellt der ADC die kritische Komponente am Übergang von der analogen zur digitalen Signalverarbeitung dar. Die Dissertation untersucht neue Systemansätze, die das Potential analoger und digitaler Möglichkeiten gleichermaßen ausschöpfen, und für Radarempfänger der nächsten Generation optimierte und verbesserte Lösungen versprechen.