cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Closer to home : Using social marketing to study participation in health reform
Creators: name: Higgins, Joan Wharf
Publisher: name: University of British Columbia
Year: 2009

description: The concept of broad-based public participation is a fundamental element of health promotion and citizenship. There is a gap, however, between the promise and reality of citizen participation in health reform. The purpose of this study was to describe the experience of public participation in a health reform initiative in one regional district; to elucidate the perspectives of both participants and nonparticipants in a particular health reform process entitled "New Directions for a Healthy British Columbia"; and, to assess the utility of social marketing concepts as an analytical tool for understanding citizen participation. The study built on diverse literatures including health promotion, citizen participation, citizenship and social marketing in order to provide a new way to conceptualize citizen participation in health reform. The study utilized the data collection methods of participant observation (n=76 meetings), key informant interviews (n=12), focus groups (n=48), street corner interviews (n=5), and a documentary review of the health reform process. A social marketing framework was used to interpret the data, including the concepts of understanding the consumer perspective, exchange, marketing mix and segmentation. In contrast to the criticism that social marketing ignores the broader context of individual behaviour, the analysis facilitated an understanding of the societal circumstances that inhibited or fostered participation. Specifically, the analysis suggested that participation was influenced by (1) citizens' perceptions of a sense of belonging to, and equality in, the community; (2) citizens' perceptions of their ability to shape policy; (3) the attainment of a minimum threshold of social and economic well-being; (4) the responsiveness of government to citizens' efforts; and, (5) the ways in which the opportunity to participate was structured. In this particular study neither the breadth of broad-based citizen participation, nor the ability of participants to shape policy was realized. The findings suggest that refraining the context of participatory democracy is necessary to facilitate citizens acting on their right and responsibility to participate meaningfully. This may be accomplished through (1) understanding, respecting and accommodating diverse citizens' perspectives about participation; (2) providing different opportunities for participation; and, (3) representing the needs and experiences of disempowered groups in health reform initiatives.
Effects of Surface and Sub-Surface Damage to Wafer Strength
Creators: name: Sparenberg, Brian
Publisher: name: Maryland Shared Open Access Repository
Year: 2009
Subjects: finite element
flexure
manufacturing
polycrystalline silicon
sub-surface damage
wafers

description: Polycrystalline silicon (polysilicon) currently serves as the primary material for solar cells in the photovoltaic industry.  The material is cast into large ingots, which are cut with a band saw into smaller ingots (i.e. bricks).  The bricks are then sliced into wafers with a wire saw.  Damage is introduced within the wafers during these processes.  If sufficient, the damage can cause brittle failure during the sawing processes, or in handling during further processing downstream.  In this study, the surface quality of eight polycrystalline silicon bricks cast at BP Solar and exhibiting a characteristic quality was investigated using contact profilometry.  The bricks were then returned to BP Solar where they were sliced into wafers.  Wafers from each of the eight bricks were collected and the surface topography of the wafer surface and wafer edges was examined using white light interferometry.  In addition, mechanical properties of the wafers were determined using biaxial flexure and a novel edge flexure test.  Fractography revealed that wafers failed from either surface flaws introduced during wire saw sectioning or edge flaws introduced during band saw sectioning.  In edge flexure, the wafer strength ranged from 135 to 158 MPa.  Fractography revealed that flaws from wafers tested in edge flexure ranged from 10 to 50 &mum in depth.  An inverse approach based on Linear Elastic Fracture Mechanics estimates the critical crack length to range from approximately 10 to 60 &mum  for typical edge strengths.  The strongest correlations are between the peak to valley height (Ry nsverse brick profiles and the wafer edge strength and the Weibull modulus (m) and effective stress concentration factors (Kt from longitudinal profiles.  The wafer strength decreased beyond a Ry mum and the Weibull modulus decreases with an increase in Kt ts from the investigation distinguished that brick quality should be quantified in terms of peak to valley roughness measured transverse to the brick.
title: Full coverage displays for non-immersive applications
Creators: name: Petford, Julian
Publisher: name: University of St Andrews
Year: 2019

description: Full Coverage Displays (FCDs), which cover the interior surface of a room with display pixels, can create novel user interfaces taking advantage of natural aspects of human perception and memory which we make use of in our everyday lives. However, past research has generally focused on FCDs for immersive experiences, the required hardware is generally prohibitively expensive for the average potential user, configuration is complicated for developers and end users, and building applications which conform to the room layout is often difficult. The goals of this thesis are: to create an affordable, easy to use (for developers and end users) FCD toolkit for non-immersive applications; to establish efficient pointing techniques in FCD environments; and to explore suitable ways to direct attention to out-of-view targets in FCDs. In this thesis I initially present and evaluate my own "ASPECTA Toolkit" which was designed to meet the above requirements. Users during the main evaluation were generally positive about their experiences, all completing the task in less than three hours. Further evaluation was carried out through interviews with researchers who used ASPECTA in their own work. These revealed similarly positive results, with feedback from users driving improvements to the toolkit. For my exploration into pointing techniques, Mouse and Ray-Cast approaches were chosen as most appropriate for FCDs. An evaluation showed that the Ray-Cast approach was fastest overall, while a mouse-based approach showed a small advantage in the front hemisphere of the room. For attention redirection I implemented and evaluated a set of four visual techniques. The results suggest that techniques which are static and lead all the way to the target may have an advantage and that the cognitive processing time of a technique is an important consideration.
Jet Riemann-Lagrange Geometry and Some Applications in Theoretical Biology
Creators: name: Nicola, Ileana Rodica
name: Neagu, Mircea
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C43, 53C07, 83C22

description: The aim of this paper is to construct a natural Riemann-Lagrange differential geometry on 1-jet spaces, in the sense of nonlinear connections, generalized Cartan connections, d-torsions, d-curvatures, jet electromagnetic fields and jet electromagnetic Yang-Mills energies, starting from some given nonlinear evolution ODEs systems modelling biologic phenomena like the cancer cell population model or the infection by human immunodeficiency virus-type 1 (HIV-1) model.
description: 14 pages
10.4 kW coherently combined ultrafast fiber laser
Creators: name: Müller, Michael
name: Aleshire, Christopher
name: Klenke, Arno
name: Haddad, Elissa
name: Légaré, François
name: Tünnermann, Andreas
name: Limpert, Jens
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: An ultrafast laser delivering 10.4 kW average output power based on coherent combination of twelve stepindex fiber amplifiers is presented. The system emits close-to-transform-limited 254 fs pulses at 80 MHz repetition rate, has a high beam quality (M2<=1.2), and a low relative intensity noise of 0.56% in the frequency range of from 1 Hz to 1 MHz. Automated spatiotemporal alignment allows for hands-off operation.
Centrosymmetric PbTe/CdTe quantum dots coherently embedded by epitaxial precipitation
Creators: name: Heiss, W.
name: Groiss, H.
name: Kaufmann, E.
name: Hesser, G.
name: Boberl, M.
name: Springholz, G.
name: Schaffler, F.
name: Koike, K.
name: Harada, H.
name: Yano, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A concept for the fabrication of highly symmetric quantum dots that are coherently embedded in a single crystalline matrix is demonstrated. In this approach, the formation of the quantum dots is induced by a transformation of an epitaxial 2D quantum well into an array of isolated precipitates with dimensions of about 25 nm. The formation process is driven by the immiscibility of the constituent materials resulting from their different lattice structures. The investigated PbTe/CdTe heterosystem combines two different cubic lattices with almost identical lattice constants. Therefore, the precipitated quantum dots are almost strain free and near thermodynamic equilibrium they exhibit the shape of small-rhombo-cubo-octahedrons. The PbTe/CdTe quantum dots, grown on GaAs substrates, display intense room temperature luminescence at wavelength around 3.2 micrometer, which makes them auspicious for applications in mid-infrared photonic devices.
description: 12 pages, 3 figures
Rotation Sensitive Quench and Revival of Coherent Oscillations in a Ring Lattice
Creators: name: Brooks, Caelan
name: Brattley, Allison
name: Das, Kunal K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We consider ultracold atoms trapped in a toroidal trap with an azimuthal lattice for utility as a macroscopic simulator of quantum optics phenomena. We examine the dynamics induced by the adiabatic introduction of the lattice that serves to couple the normal modes, as an analog of a laser field coupling electronic states. The system is found to display two distinct behaviors, manifest in the angular momentum - coherent oscillation and self-trapping - reminiscent of non-linear dynamics, yet not requiring interatomic interactions. The choice is set by the interplay of discrete parameters, the specific initial mode and the periodicity of the lattice. However, rotation can cause continuous transition between the two regimes, causing periodic quenches and revivals in the oscillations as a function of the angular velocity. Curiously, the impact of rotation is determined entirely by the energy spectrum in the absence of the lattice, a feature that can be attributed to adiabaticity. We assess the effects of varying the lattice parameters, and consider applications in rotation sensing.
description: 11 pages, 9 figures
Der Digitalhype als didaktische Herausforderung
Creators: name: Redecker, Anke
Publisher: name: Medienimpulse
Year: 2023

description: Digitale Elementarbildung kann durch forschendes Lernen transformatorische Erkundungs- und Urteilsprozesse in den Blick nehmen, durch die Kinder darauf vorbereitet werden, sich sinn- und verantwortungsvoll mit anderen, anderem und sich selbst auseinanderzusetzen. Um Bekanntes hinterfragen und sich auf Inkonsistenzen einlassen zu können, bedarf es in Kita und Grundschule einer didaktischen Anregung, die Lernende bei dieser Mühe und Muße erfordernden Aufgabe unterstützt. Dies widerspricht einer technologischen Lernauffassung, die sich auf die instrumentalisierende Erfüllung vorkonstruierter Aufgaben beschränkt. Hält Robotik Einzug in die Elementarbildung, um ein Ideal maschinenähnlichen Verhaltens zu propagieren, werden Kinder auf grundschulische Internalisierungspraktiken per drill and practice vorbereitet, die Kokreativität durch Konkurrenzorientierung und Kontingenzsensibilität durch die Illusion einer umfassenden kybernetischen Kontrollierbarkeit ersetzt.
description: Medienimpulse, Bd. 61 Nr. 3 (2023): Medialität in der Transition zwischen Elementarbereich und Primarstufe
Effects of Non-Linear Interfacial Mechanics on the Transient Response of a Drop to an External Flow Field
Creators: name: Gonzalez-Mancera, Andres
Publisher: name: Maryland Shared Open Access Repository
Year: 2007
Subjects: Engineering, Mechanical (0548)
interfacial dynamics
multiphase flow
surfactants
cfd
boundary integral method

description: The time-dependent response of a drop suspended in an axisymmetric extensional flow is studied. The dynamics of such multiphase systems is of interest in areas that include the petroleum, pharmaceutical, biomedical and food industries. The focus is on the role that a surfactant monolayer on the drop interface plays during the deformation and retraction processes. The steady-state characteristics and the bulk flow are analyzed for validation. The transient processes are simulated using an axisymmetric boundary integral method. At each time step the shape of the drop is determined based on the velocity of points at the interface and surfactant is redistributed accordingly. The response time of drop deformation in an extensional flow was seen to depend monotonically on the initial surfactant coverage on the interface. That is, higher surfactant coverage leads to increasing values of response time. It was seen that Marangoni stresses developing on the interface due to surface tension gradients slow the response of the drop. Retraction of the drop when the external flow ceases is caused by an imbalance between the traction along the drop's interface and the shear stresses. Neglecting the initial stages, the retraction process can be closely approximated by an exponential decay. It was shown that the retraction time depends non-monotonically on the surfactant coverage. Small amounts of surfactant slow down the retraction process compared to that of the clean drop for coverage less than 50%. Further increasing the surfactant concentration accelerates the retraction process and as the coverage approaches 100%, the value of the retraction time approaches that of the clean drop. These dynamics emerge from the competition between the convective flux that creates the surfactant gradients and the large Marangoni stresses that develop to oppose them during the extension process. At low to intermediate surfactant concentrations, large surfactant gradients developed during the deformation process persist until equilibrium is reached because diffusion time is much longer than the retraction rate. At higher initial surfactant concentrations, lower surfactant gradients develop during deformation and these quickly vanish during the initial stages of retraction leading to a nearly uniform surface tension distribution along the interface.
Summary and Evaluation of Jamaica, Trinidad and Tobago, Leeward Islands, Windward Islands, Barbados, and British Guiana: Projected Levels of Demand, Supply, and Imports of Agricultural Products to 1975
Creators: name: Western Hemisphere Branch, Foreign Regional Analysis Division
name: Western Hemisphere Branch, Foreign Regional Analysis Division
Publisher: name: Unknown
Year: 1966
Subjects: Agricultural and Food Policy
Crop Production/Industries
Demand and Price Analysis
Food Consumption/Nutrition/Food Safety
International Relations/Trade
Land Economics/Use
Livestock Production/Industries
Productivity Analysis
Research Methods/ Statistical Methods

description: This report is a summary and evaluation, with implications for U.S. agriculture, of the detailed study report "Jamaica, Trinidad and Tobago, Leeward Islands, Windward Islands, Barbados, and British Guiana: Projected Levels of Demand, Supply, and Imports of Agricultural Products to 1975," ERS-Foreign 94, issued in March 1965. The study report was prepared by the Institute of Social and Economic Research, University College of the West Indies, Jamaica, under a contract with the Foreign Agricultural Service of the U.S. Department of Agriculture. The contract was administered by the Western Hemisphere Branch, Foreign Regional Analysis Division, Economic Research Service, of the Department.
Experimental and Theoretical Investigations of Heat Elevation and Specific Absorption Rate during Magnetic Nanoparticle Hyperthermia
Creators: name: Salloum, Maher D.
Publisher: name: Maryland Shared Open Access Repository
Year: 2008
Subjects: hyperthermia
magnetic
nanoparticle
specific absorption rate (SAR)
temperature
tumor
Engineering, Mechanical (0548)
Engineering, Biomedical (0541)
Health Sciences, Oncology (0992)

description: Magnetic nanoparticle hyperthermia has attracted growing research interests in malignant tumors treatment due to its simple implementation and few complications. In this approach, magnetic nanoparticles delivered to the tissue induce localized heating when exposed to an alternating magnetic field, leading to irreversible thermal damage to the tumor. Controlling the temperature elevations in such treatment is still an immense challenge in clinical applications. In the first part of this dissertation, we evaluate magnetic nanofluid transport in agarose gel. By adjusting the gel concentration and injection rate, we identify an optimal delivery strategy for achieving a spherically shaped nanoparticle dispersion that allows for a controlled heat distribution. It was shown that the shape and volume of the nanofluid distribution are highly dependent on the injection rate and gel porosity. The measured specific absorption rate (SAR) shows that the nanoparticle distribution is not uniform with a higher concentration close to the injection site.  In the second part of this dissertation, we evaluate the effects of the blood perfusion rate and the nanofluid amount on the heating pattern and temperature elevations in rat muscle tissue during in vivo experiments. Doubling the amount of nanofluid resulted in about 70% increase of the temperature elevation around the injection site and a temperature of 43o< le under the protocol and magnetic field parameters used in the experiment. Using the measured temperature distribution, an inverse heat transfer analysis was performed to evaluate the induced SAR. It showed that the nanoparticles are more concentrated in the vicinity of the injection site when their amount is bigger.   Finally, an optimization algorithm is developed to determine the optimum heating patterns induced by multiple nanoparticle injections in a tumor. The design objective is to elevate the temperatures of at least 90% of the tumor above 43o< sure that only less than 10% of the normal tissue is heated to temperatures over 43o< iency and capability of this approach have been demonstrated in two tumors with simple or complicated geometry. The results of this study ought to be coupled with an experimental database to relate the optimized SAR parameters to their appropriate nanoparticle concentration, injection amount, and injection rate. We believe that the developed optimization algorithm can be used as a guideline for physicians to design an optimal treatment plan in magnetic nanoparticle hyperthermia.
Modelling and Initial Assessment of a Fuel Cell Auxiliary Propulsion and Power Unit (Presentation)
Creators: name: Kolb, Moritz Georg
name: Seitz, Arne
name: Türkyilmaz, Barlas
name: Ma, Yiyuan
name: Hornung, Mirko
Publisher: name: Zenodo
Year: 2024
Subjects: FC-APPU
FC-APU
High-Temperature PEMFC
Fuel Cell Propulsion
Hydrogen Aviation
Fuel Cell Modelling
Fuel Cell Thermal Management

description: Presentation held as part of the conference paper ICAS2024_0261 in session 14.3 at the 34th Congress of the International Council of the Aeronautical Sciences in Florence.

 

The paper discusses the modelling and initial assessment of a novel high-temperature Fuel Cell Auxiliary Propulsion and Power Unit (FC-APPU) for a short-to-medium range multi-fuel passenger aircraft with an entryinto-service of 2035. The FC-APPU is characterized by its ability to not only provide power for aircraft subsystems, but also power for thrust generation. The general system architecture of a FC-APPU is introduced, along with an overview of the implemented cell, stack and system modelling approaches. A baseline aircraft is defined and corresponding profiles for subsystem and propulsive power demands are derived. The fuel cell system is assessed over the entirety of an aircraft mission and integration implications are evaluated in terms of system mass, drag and hydrogen consumption based on different technology scenarios. The results are compared to a Fuel Cell Auxiliary Power Unit (FC-APU) of the same entry-into-service and technology status.
Texturen des Aufbegehrens
Creators: name: Ballhausen, Thomas
Publisher: name: Medienimpulse
Year: 2023

description: Rund um das historische Schlüsseljahr 1968 leben junge Comic-Künstler*innen Medienkompetenz als Aufstand, Aneignung und Emanzipation. Durch ihr selbstbestimmtes Aufbegehren revolutionieren sie von Europa aus nicht nur die internationale Comic-Szene, sondern auch erzählerische Formen und zeichnerische Möglichkeiten des Mediums. Die damit einhergehenden, radikalen Weiterentwicklungen von Erzählmodi, publizistischen Formaten und Distributionssystemen stehen im Kontext medienpolitischer Verschiebungen, die eben von einer Generation von Comic-Künstler*innen mitgetragen wird, die bereits als Leser*innen mit dem Medium aufgewachsen sind. Im Zentrum dieser Entwicklungen steht der französische Künstler Moebius, der bereits mit seinem Frühwerk Bekanntheit erlangte und die Umsetzung emanzipativer Strategien im Medium Comic auf unterschiedlichsten Ebenen deutlich als auch nachhaltig geprägt hat.
description: Medienimpulse, Bd. 61 Nr. 3 (2023): Medialität in der Transition zwischen Elementarbereich und Primarstufe
Volksschulen als Ermöglichungsraum kompetenter Medienbildung
Creators: name: Pecher, Helmut
Publisher: name: Medienimpulse
Year: 2023

description: Der Beitrag schlägt, ausgehend von medienbezogenen Handlungspraxen berufseinsteigender Primarstufenlehrender, die Konzeptualisierung von medienpädagogischen Entwicklungsaufgaben vor.  Medienkompetenzen und medienpädagogische Kompetenzen werden dabei dem berufsbiografisch orientierten Kompetenzmodell gegenübergestellt.  Ausgewählte Interviewpassagen einer qualitativen Teilstudie sollen die theoretische Konzeption empirisch untermauern.
description: Medienimpulse, Bd. 61 Nr. 3 (2023): Medialität in der Transition zwischen Elementarbereich und Primarstufe
Predictions of an A_4 model with a five-parameter neutrino mass matrix
Creators: name: Lavoura, L.
name: Kuhbock, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider a model with an A_4 flavour symmetry, recently proposed by E. Ma, and make a numerical study, through scatter plots, of its neutrino mass matrix.
description: 10 pages, 8 eps figures, typo corrected
Frequency shift of cesium clock transition due to blackbody radiation
Creators: name: Angstmann, E. J.
name: Dzuba, V. A.
name: Flambaum, V. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We have performed ab initio calculations of the frequency shift induced by a static electric field on the cesium clock hyperfine transition. The calculations are used to find the frequency shifts due to blackbody radiation. Our result ($δν/E^2=-2.26(2)\times 10^{-10}$Hz/(V/m)$^2$) is in good agreement with early measurements and ab initio calculations performed in other groups. We present arguments against recent claims that the actual value of the effect might be smaller. The difference ($\sim$ 10%) between ab initio and semiempirical calculations is due to the contribution of the continuum spectrum to the sum over intermediate states.
description: Accepted for publication in Phys. Rev. Lett
Radio PARADIES – eine inklusive Radiosendung
Creators: name: Tradinik, Ernst
name: Adler, Lukas
Publisher: name: Medienimpulse
Year: 2023

description: Der Beitrag berichtet auf der Ebene konkreter Unterrichtspraxis von einem Projekt zur Radioproduktion und erläutert eingehend verschiedene Aspekte bzw. Teilbereiche der inklusiven Medienarbeit einer inklusiven Radiosendung. Dabei werden Phänomene und Dynamiken des Sprechens im Radio genauso thematisiert wie die Arbeit an Gestaltung und Schnitt einer Sendung. Insgesamt betonen die Autoren, dass es neben den Normen der Inklusion auch darum geht, ein weiteres Radio- und Podcastangebot für Hörer*innen zu gestalten, die sich ein Bild von Menschen mit (Lern-) Behinderung und/oder psychischer Erkrankung als Radiomacher*innen machen können und dabei vielleicht vergessen, wer hier moderiert und Interviews führt.
description: Medienimpulse, Bd. 61 Nr. 3 (2023): Medialität in der Transition zwischen Elementarbereich und Primarstufe
Editorial 03/2023: Medialität in der Transition zwischen Elementarbereich und Primarstufe
Creators: name: Barberi, Alessandro
name: Pollak, Lisa
name: Rupp, Tanja
name: Schuschnig, Alena
name: Schmitz, Dominik
Publisher: name: Medienimpulse
Year: 2023

description: Der Übergang zwischen Kindergarten und Volksschule stellt nicht nur für Kinder, sondern auch für ihr soziales Netzwerk aus Erziehungsberechtigten, Angehörigen und Fachkräften aus Bildungsinstitutionen eine besondere Herausforderung dar. Medienerfahrungen sind Alltagserfahrungen von Kindern, die (digitale) Medien als lebensweltbezogenes Thema in die Institutionen einbringen (Lepold/Ullmann 2021). Die Tatsache, dass der medienpädagogischen Arbeit in der Begleitung dieser Transitionsprozesse eine immer bedeutendere Rolle zukommt, bildet daher den Ausgangspunkt für die Ausgabe 03/2023 der MEDIENIMPULSE.
description: Medienimpulse, Bd. 61 Nr. 3 (2023): Medialität in der Transition zwischen Elementarbereich und Primarstufe
Sum-Rate Maximization in Distributed Intelligent Reflecting Surfaces-Aided mmWave Communications
Creators: name: Xiu, Yue
name: Sun, Wei
name: Wu, Jiao
name: Gui, Guan
name: Wei, Ning
name: Zhang, Zhongpei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we focus on the sum-rate optimization in a multi-user millimeter-wave (mmWave) system with distributed intelligent reflecting surfaces (D-IRSs), where a base station (BS) communicates with users via multiple IRSs. The BS transmit beamforming, IRS switch vector, and phase shifts of the IRS are jointly optimized to maximize the sum-rate under minimum user rate, unit-modulus, and transmit power constraints. To solve the resulting non-convex optimization problem, we develop an efficient alternating optimization (AO) algorithm. Specifically, the non-convex problem is converted into three subproblems, which are solved alternatively. The solution to transmit beamforming at the BS and the phase shifts at the IRS are derived by using the successive convex approximation (SCA)-based algorithm, and a greedy algorithm is proposed to design the IRS switch vector. The complexity of the proposed AO algorithm is analyzed theoretically. Numerical results show that the D-IRSs-aided scheme can significantly improve the sum-rate and energy efficiency performance.
description: This paper appears in 2021 IEEE Wireless Communications and Networking Conference (WCNC 2021)
Spin-Hall effect in semiconductor heterostructures with cubic Rashba spin-orbit interaction
Creators: name: Bleibaum, O.
name: Wachsmuth, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the spin-Hall effect in systems with weak cubic Rashba spin-orbit interaction. To this end we derive particle and spin diffusion equations and explicit expressions for the spin-current tensor in the diffusive regime. We discuss the impact of electric fields on the Green's functions and the diffusion equations and establish a relationship between the spin-current tensor and the spin diffusion equations for the model under scrutiny. We use our results to calculate the edge spin-accumulation in a spin-Hall experiment and show that there is also a new Hall-like contribution to the electric current in such systems.
description: 14 pages
Medienpädagogik trotz knapper Ressourcen
Creators: name: Schmitz, Dominik
Publisher: name: Medienimpulse
Year: 2023

description: Kinder bringen Medienerfahrungen als lebensweltbezogenes Thema mit in die elementarpädagogischen Einrichtungen und Schulklassen. Pädagog:innen stehen angesichts der stets wachsenden Bedeutung von digitalen Medien in Kindheiten vor noch höheren Anforderungen, ihre alltägliche Arbeit im Kontext mit digitalen Medien zu professionalisieren, und das oftmals ohne, dass die Einrichtungen selbst über technisches Equipment verfügen und die zeitlichen Ressourcen der Pädagog:innen, sich z. B. in Medienpädagogik fortzubilden, begrenzt sind. Im Artikel wird deshalb zunächst die Rolle von Medien im Alltag von Kindern beleuchtet und Chancen herausgearbeitet, die frühes medienpädagogisches Arbeiten mit Kindern mit sich bringt. Im Speziellen wird hierbei auf die sensible Phase der Transition eingegangen. Im Anschluss werden Herausforderungen für die Medienarbeit in Bildungseinrichtungen erläutert, die durch knappe Ressourcen zusätzlich verstärkt werden. Dieses Spannungsfeld skizziert, werden im Anschluss die Digiboxen des Wiener Bildungsservers vorgestellt, die ein niederschwelliges und kostenloses Angebot für Wiener Kindergärten und Schulen darstellen. Es soll argumentiert werden, wie durch solche medienpädagogischen Angebote kleine Schritte vorgenommen werden können, damit Medienpädagogik trotz bestehender Herausforderungen Einzug in die Einrichtungen hält und Kindern zusätzliche Medienerfahrungen ermöglicht werden.
description: Medienimpulse, Bd. 61 Nr. 3 (2023): Medialität in der Transition zwischen Elementarbereich und Primarstufe
The luminosity-redshift relation in brane-worlds: I. Analytical results
Creators: name: Keresztes, Zoltán
name: Gergely, László Á.
name: Nagy, Botond
name: Szabó, Gyula M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The luminosity distance - redshift relation is analytically given for generalized Randall-Sundrum type II brane-world models containing dark radiation. The derived expressions contain both elementary functions and elliptic integrals of the first and second kind. First we derive the relation for models with the Randall-Sundrum fine-tuning. Then we generalize the method for models with cosmological constant. The analytical results are suitable for testing brane-world models when future supernova data at higher redshifts will be available.
description: v2: Improved discussion and new references; analytical results kept, comparison with observation moved to astro-ph/0702610, 18 pages, 2 figures v3: Minor improvements, few new references. Version to appear in the initial issue of PMC Physics A
Rezension: "Vernehmungsraum. Aufzeichnungen einer Vermissten" von Jennifer Kwon Dobbs, übersetzt von Irina Bondas und Felix Schiller
Creators: name: Pircher, Lorena
Publisher: name: Medienimpulse
Year: 2023

description: In ihrem beeindruckenden lyrischen Werk verwebt Jennifer Kwon Dobbs (geb. 1976 in Wonju, Südkorea) koloniale Vergangenheit mit gegenwärtigen Diskriminierungserfahrungen und kollektive Erfahrungen mit individuellen Erlebnissen. Das lyrische Ich begibt sich auf die Suche nach der Mutter und der Muttersprache Koreanisch, erinnert sich an eine Kindheit zwischen Kulturen und schlägt Brücken über die Grenze eines geteilten Landes, zwischen der Generation seiner Großeltern und sich selbst. Die heterogenen lyrischen Texte arbeiten mit Leerstellen, Auslassungen, Schwärzungen, Fotografien und Briefen und verdichten sich Gedicht für Gedicht zu einer Abbildung historischer Ereignisse wie des Koreakriegs und des Kalten Kriegs, sowie zu einer Erforschung der Nachwirkungen der Kolonialisierung Koreas, die heute oftmals totgeschwiegen werden. Gleichzeitig thematisiert Dobbs‘ Werk ein Aufwachsen in den USA, Aspekte von Migration, Identität, Herkunft und Mehrsprachigkeit sowie den Akt des Übersetzens. Die präzise, sparsame Sprache der Autorin, die sich mit großer erzählerischer Feinfühligkeit verbindet, wendet sich gegen autoritäre Systeme jeder Art und gegen das Schweigen über vergangene Verbrechen. Dobbs Vernehmungsraum ist somit ein höchst aktuelles Werk, das zwingt, sich mit dem Erbe kolonialen Grauens auseinanderzusetzen und sich so dem Vergessen entgegenstellt.
description: Medienimpulse, Bd. 61 Nr. 4 (2024): Habitus / Medialer Habitus / Digitaler Habitus
Rezension: "Gustaf Gründgens. Filmische Arbeiten 1930-1960" von Kristina Höch
Creators: name: Burger, Michael
Publisher: name: Medienimpulse
Year: 2023

description: Kristina Höch arbeitet in ihrer Monografie lückenlos die filmischen Arbeiten des als Theaterschauspieler reüssierenden Gustaf Gründgens heraus, der auch eine vier Jahrzehnte umfassende Karriere als Filmschauspieler und -regisseur vorweisen kann. Dabei reflektiert die Filmwissenschaftlerin auch stets den gesellschaftspolitischen Hintergrund der Produktion und Rezeption mit.
description: Medienimpulse, Bd. 61 Nr. 4 (2024): Habitus / Medialer Habitus / Digitaler Habitus
rbcL sequence.docx
Creators: name: Khan, Muhammad Naeem
name: Ahmad, Aftab
name: Ghouri, Muhammad Zubair
name: Aslam, Sabin
name: Younas Khattak, Muhammad
name: Luying, Du
name: Mei, Kunrong
name: Habibullah Khan, Sultan
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 310803
subject: Plant cell and molecular biology

description: Molecular fingerprinting of Pakistani almonds using chloroplast DNA sequences of rbcL and matK genes
Rezension: "Merlins Tochter" von Sophie Reyer
Creators: name: Lenhart, Johanna
Publisher: name: Medienimpulse
Year: 2023

description: In ihrem neuen Roman spürt Sophie Reyer einer traumatischen Kindheit und rettender Imaginationskraft nach. Der vielseitigen Autorin gelingt so ein eindringliches Porträt einer misshandelten Frau, die ihr Schicksal auf überraschende Weise selbst in die Hand nimmt.
description: Medienimpulse, Bd. 61 Nr. 4 (2024): Habitus / Medialer Habitus / Digitaler Habitus
Rezension: "Siegfried the Wrestler. The Wilhelmine World of a Colportage Novel" von Peter S. Fisher
Creators: name: Haberich, Max
Publisher: name: Medienimpulse
Year: 2023

description: Obwohl nahezu verschwunden, gelang es Fisher, einige Kolportageromane des Kaiserreichs aufzuspüren, mit denen sich die arbeitenden Schichten ihre Freizeit vertrieben. Er liefert eine Analyse allgemeiner Vorurteile und Geistesströmungen der Zeit, wie sie in dieser sogenannten „Schundliteratur“ zum Ausdruck kamen, was nicht nur ein Schlaglicht auf die bürgerliche Moral wirft, sondern auch auf die gesellschaftlichen und politischen Konsequenzen, die sie nach sich zogen.


 
description: Medienimpulse, Bd. 61 Nr. 4 (2024): Habitus / Medialer Habitus / Digitaler Habitus
Local Property Characterization of Friction Stir Welded Titanium 5111
Creators: name: Nimer, Salahudin Mohamed
Publisher: name: Maryland Shared Open Access Repository
Year: 2011
Subjects: friction stir welding
microsampling
navy
titanium
titanium 5111
welding

description: Friction stir welding (FSW) provides many advantages over traditional joining techniques, most significantly, lower cost of fabrication. Titanium alloys provide a high specific strength and increased corrosion resistance, which makes them an attractive material for use in harsh sea environments such as those experienced by Naval marine vessels. This research is focused on understanding the mechanical properties of a FSW of a 12.7 mm thick plate of Ti-5111 in the two plate loading directions. The weld showed significant strength and ductility increases in the stir zone in both directions. The retreating side of the weld showed reduced strength and ductility below the base property. This result, however, was found to be limited to the micro-scale. The longitudinal direction showed slightly higher strengths, and lower ductility than the transverse direction. The understanding from this research will lead to future process optimizations of FSW.
Integrating Computational Synthesis and Decision-Based Conceptual Design
Creators: name: Dong, Hui
Publisher: name: Maryland Shared Open Access Repository
Year: 2008
Subjects: Engineering, Mechanical (0548)
Design for Manufacturing
Decision-Based Design
Case-Based Design
Conceptual Design

description: oncurrent engineering and life-cycle design have made an outsized imprint on today's engineering enterprise. By focusing primarily on detailed geometry, Design for Manufacture (DfM) tends to recommend incremental changes. While many of the methods developed have proven effective in isolation, reconciling the competing goals that the represent requires ever-greater design freedom. Increasingly this means moving DfM consideration upstream in the design process to conceptual design. This work presents a DfM methodology for decision-based conceptual design whose goal is to afford the consideration of all aspects of performance and functional requirements where design freedom is greatest - the earliest stages of the design process. This methodology draws on both formal reasoning and case experience for generating design alternatives by applying functional modeling. These functional abstractions are merged with real part geometry associated with manufacturing knowledge from reverse engineering toward generating manufacturable design skeletons. Such direct connection from function to manufacturable form afforded by this methodology allows the designer to make better-informed design decisions at the earliest design stage. Design is often cast as an iterative process of solution generation and selection. This work also shows initial efforts of integrating multiple abstractions of computational synthesis and evaluating this synthesis to the accomplishment of both function and performance goals. Design abstractions described in this work help manage the problem size: high-level design concepts are generated and the best selected for further development. The selection process is at all times based on uncertain models both of design performance and design value. This research combines the computational synthesis across design abstractions for generating design candidates and decision-based conceptual design both selecting among them and for refining the evaluation model driving this selection. Normative methods from decision theory are used for controlling design search and evaluation. A liquid dispensing system design case is described to explore the computational framework we proposed and to illustrate our DfM methodology in the domain of mechatronic design. It demonstrates both the promise of the methodology and the challenges presented by computer-aided conceptual design.
Single-shot dynamics of spin-orbit torque and spin transfer torque switching in three-terminal magnetic tunnel junctions
Creators: name: Grimaldi, Eva
name: Krizakova, Viola
name: Sala, Giacomo
name: Yasin, Farrukh
name: Couet, Sébastien
name: Kar, Gouri Sankar
name: Garello, Kevin
name: Gambardella, Pietro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Current-induced spin-transfer torques (STT) and spin-orbit torques (SOT) enable the electrical switching of magnetic tunnel junctions (MTJs) in nonvolatile magnetic random access memories. In order to develop faster memory devices, an improvement of the timescales underlying the current driven magnetization dynamics is required. Here we report all-electrical time-resolved measurements of magnetization reversal driven by SOT in a three-terminal MTJ device. Single-shot measurements of the MTJ resistance during current injection reveal that SOT switching involves a stochastic two-step process consisting of a domain nucleation time and propagation time, which have different genesis, timescales, and statistical distributions compared to STT switching. We further show that the combination of SOT, STT, and voltage control of magnetic anisotropy (VCMA) leads to reproducible sub-ns switching with a spread of the cumulative switching time smaller than 0.2 ns. Our measurements unravel the combined impact of SOT, STT, and VCMA in determining the switching speed and efficiency of MTJ devices.
On the Frame Error Rate of Transmission Schemes on Quasi-Static Fading Channels
Creators: name: Chatzigeorgiou, Ioannis
name: Wassell, Ian J.
name: Carrasco, Rolando
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: It is known that the frame error rate of turbo codes on quasi-static fading channels can be accurately approximated using the convergence threshold of the corresponding iterative decoder. This paper considers quasi-static fading channels and demonstrates that non-iterative schemes can also be characterized by a similar threshold based on which their frame error rate can be readily estimated. In particular, we show that this threshold is a function of the probability of successful frame detection in additive white Gaussian noise, normalized by the squared instantaneous signal-to-noise ratio. We apply our approach to uncoded binary phase shift keying, convolutional coding and turbo coding and demonstrate that the approximated frame error rate is within 0.4 dB of the simulation results. Finally, we introduce performance evaluation plots to explore the impact of the frame size on the performance of the schemes under investigation.
description: 5 pages, 4 figures, Proceedings of the 42nd Conference on Information Sciences and Systems, Princeton, USA, March 19-21, 2008
An ultra sensitive radio frequency single electron transistor working up to 4.2 K
Creators: name: Brenning, Henrik
name: Kafanov, Sergey
name: Duty, Tim
name: Kubatkin, Sergey
name: Delsing, Per
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present the fabrication and measurement of a radio frequency single electron transistor (rf-SET), that displays a very high charge sensitivity of 1.9 microlectrons/sqrt(Hz) at 4.2 K. At 40 mK, the charge sensitivity is 0.9 and 1.0 microlectrons/sqrt(Hz) in the superconducting and normal state respectively. The sensitivity was measured as a function of radio frequency amplitude at three different temperatures: 40 mK, 1.8 K and 4.2 K.
description: 13 pages, 4 figures
Rezension: "American Born Chinese" von Gene Luen Yang, übersetzt von Matthias Wieland
Creators: name: Krenn, Günter
Publisher: name: Medienimpulse
Year: 2023

description: Der amerikanische Autor und Zeichner Gene Luen Yang verkörpert, wovon er in seiner preisgekrönten Graphic Novel American Born Chinese erzählt: Er ist der Sohn von asiatischen Immigrant*innen, wobei sein Vater aus Taiwan stammt, seine Mutter aus Hongkong. Von Matthias Wieland jüngst ins Deutsche übersetzt, erzählt Gene Luen Yang mit kunstvoll ineinander vermengten Geschichten, deren Zusammengehörigkeit sich erst im Laufe der Zeit offenbart, vom Prozess einer schwierigen Immigration. Letztlich, so seine Botschaft, geht es um Identität, die nicht von außen und von anderen bestimmt wird.
description: Medienimpulse, Bd. 61 Nr. 4 (2024): Habitus / Medialer Habitus / Digitaler Habitus
Identification Of Magnitudes And Locations Of Loads On Slender Beams Using Strain Gage Based Methods With Application To Portable Army Bridges
Creators: name: Bednarz, Edward Theodore
Publisher: name: Maryland Shared Open Access Repository
Year: 2012
Subjects: Bridge
Gage
Identification
Load
Strain
Transducer

description: Unique strain gage based methods were developed to identify magnitudes and locations of loads on a non-continuous, non-homogenous, slender beam with variable cross sections, welded and bolted joints, and pinned, firm rest, soft rest, pinned-fixed, and fixed boundary conditions. Four uniaxial strain gages mounted to the bottom surface of the beam created a force transducer capable of identifying the magnitude and location of a load inside the weight area. By combining individually scaled strain gage outputs, the bending moment diagram was constructed. For the case of multiple loads separated by two or more strain gage locations, uniaxial strain gages forming multiple force transducers can still identify the magnitudes and locations of all the loads. A calibration method was developed to account for the discrepancies between the theoretical and actual scaling factors arising from stress concentrations and unpredictable stress patterns in the beams due to the presence of the joints. The strain gage based force transducer methodology was experimentally validated on prismatic beams with firm rest, soft rest, firm rest-fixed, and fixed boundary conditions; an aluminum beam with a bolted joint; and a half aluminum and half steel beam with two different cross sections and a bolted joint. It was also experimentally validated on a continuous aluminum beam with a linearly varying cross section and rest boundary conditions, a tapered aluminum beam with a series of welded joints, and a full scale portable army bridge at the US Army Aberdeen Test Center. The force transducer methodology is independent of the boundary conditions of the beam and the error from strain gage drift due to uniform thermal expansion on a prismatic beam can cancel out.           When there are multiple loads separated by only one strain gage location, the problem is ill posed for the force transducer methodology. Another method has been developed using two shear gages mounted on the neutral axis of the beam, one on each side of a load, to identify the magnitude of the load in this case. A combination of two uniaxial strain gages and two shear gages, with one uniaxial strain gage and one shear gage at the same location on each side of a load, can be used to identify the location of the load. The strain gage based methods were experimentally validated on a prismatic beam with rest boundary conditions.