22,807 Works

„Gender-Bender“: Sound und kulturelle Repräsentation einer Technologie zur Stimmen-Transformation

Florian Heesch & Reinhard Kopanski

Neoliberal Working Conditions, SelfPromotion and DJ Trajectories: A Gendered Minefield

Anna Gavanas & Rosa Reitsamer

Phallic girls of pop: Nicki Minaj’s sampled anaconda and the semiotics of contradiction

Barbara Bradby

Einleitung

Lena Jade Müller

Warum kostet ein wissenschaftliches Buch 28.000 EUR?

Sebastian Nordhoff
Dieser Aufsatz bespricht die Kostenstruktur der Produktion von OpenAccess-Büchern und weist auf den derzeitigen Mangel an belastbaren Zahlen zu den tatsächlichen Kosten der OA-Buchproduktion hin. Um diesem Mangel abzuhelfen, wird eine gemeinschaftliche Anstrengung zur offenen Inventarisierung und Bepreisung der erfordelichen Tätigkeiten gefordert. Eine Referenzimplementierung wird anhand des Projekts “Full disclosure: replicable strategies for book publications supplemented with empirical data” vorgestellt.

Synthesis and Functionalization of Periodic Copolymers

Falk Kubatzki, Lucas Al-Shok & Niels Ten Brummelhuis
For the copolymerization of non-conjugated olefins and maleimides, it is known that under certain conditions periodic ABA monomer sequences are formed. In this work, such a copolymerization is used to create polymers which have defined (periodic) monomer sequences and can be functionalized after polymerization. The copolymerization of pentafluorophenol (PFP) active esters of 4-pentenoic acid and perillic acid with N-phenyl maleimide (PhMI) was studied in 1,2-dichloroethane (DCE) and 1,1,1,3,3,3-hexafluoro-2-phenyl-2-propanol (HFPP). In DCE and for the copolymerization...

A Note on the Depth-from-Defocus Mechanism of Jumping Spiders

Aleke Nolte, Daniel Hennes, Dario Izzo, Christian Blum, Verena Hafner & Tom Gheysens
Jumping spiders are capable of estimating the distance to their prey relying only on the information from one of their main eyes. Recently, it has been shown that jumping spiders perform this estimation based on image defocus cues. In order to gain insight into the mechanisms involved in this blur-to-distance mapping as performed by the spider and to judge whether inspirations can be drawn from spider vision for depth-from-defocus computer vision algorithms, we constructed a...

Neighborhood Effects in Wind Farm Performance: A Regression Approach

Matthias Ritter, Simone Pieralli & Martin Odening
The optimization of turbine density in wind farms entails a trade-off between the usage of scarce, expensive land and power losses through turbine wake effects. A quantification and prediction of the wake effect, however, is challenging because of the complex aerodynamic nature of the interdependencies of turbines. In this paper, we propose a parsimonious data driven regression wake model that can be used to predict production losses of existing and potential wind farms. Motivated by...

Synthesis and Characterization of Perovskite-Type [K1−xNax]MgF3 Mixed Phases via the Fluorolytic Sol-Gel Synthesis

Florian Schütz, Linda Lange, Kerstin Scheurell, Gudrun Scholz & Erhard Kemnitz
The focus of this article is the synthesis of perovskite-type [K1−xNax]MgF3 mixed phases via the room-temperature fluorolytic sol-gel approach. Different molar ratios of K/Na were examined and analyzed by 19F MAS NMR and X-ray powder diffraction. Starting from pure KMgF3, a systematic substitution of potassium by sodium was evidenced when replacing K by Na. As long as the amount of sodium is less than 80% as compared to potassium, spectra just show [K4−xNaxF] environments in...

Using Intra-Annual Landsat Time Series for Attributing Forest Disturbance Agents in Central Europe

Julian Oeser, Dirk Pflugmacher, Cornelius Senf, Marco Heurich & Patrick Hostert
The attribution of forest disturbances to disturbance agents is a critical challenge for remote sensing-based forest monitoring, promising important insights into drivers and impacts of forest disturbances. Previous studies have used spectral-temporal metrics derived from annual Landsat time series to identify disturbance agents. Here, we extend this approach to new predictors derived from intra-annual time series and test it at three sites in Central Europe, including managed and protected forests. The two newly tested predictors...

Lessons Learned from the CHiC and SBS Interactive Tracks

Toine Bogers, Maria Gäde, Mark Hall, Vivien Petras & Mette Skov
Over the course of the past two decades, the Interactive Tracks at TREC and INEX have contributed greatly to our knowledge of how to run an interactive IR evaluation campaign. In this position paper, we add to this body of knowledge by taking stock of our own experiences and challenges in organizing the CHIC and SBS Interactive Tracks from 2013 to 2016 in the form of a list of important properties of any future IIR...

Supporting Complex Search Tasks

Maria Gäde, Mark Hall, Hugo C. Huurdeman, Jaap Kamps, Marijn Koolen, Mette Skov, Elaine Toms & David Walsh
There is broad consensus in the field of IR that search is complex in many use cases and applications, both on the Web and in domain specific collections, and both professionally and in our daily life. Yet our understanding of complex search tasks, in comparison to simple look up tasks, is fragmented at best. The workshop addressed the many open research questions: What are the obvious use cases and applications of complex search? What are...

Microplastics Reduce Short-Term Effects of Environmental Contaminants. Part I: Effects of Bisphenol A on Freshwater Zooplankton Are Lower in Presence of Polyamide Particles

Saskia Rehse, Werner Kloas & Christiane Zarfl
Microplastics can have direct physical effects on organisms in freshwater systems, and are considered as vectors for absorbed environmental pollutants. It is still under discussion if microplastics are relevant pollutant vectors for uptake into aquatic organisms in comparison to further uptake pathways, e.g., via water or sediment particles. We analyzed how the presence of microplastics (polyamide particles, PA) modifies acute effects of the environmental pollutant bisphenol A (BPA) on freshwater zooplankton (Daphnia magna). Daphnids were...

Guided by generalization and uncertainty

Charley Wu
Wie navigieren Menschen in unüberschaubaren Umgebungen, wenn es nicht möglich ist, alle Optionen ausführlich zu untersuchen? Die Forschung zum menschlichen Lernen hat in den letzten Jahrzehnten rasche Fortschritte gemacht: Von der Entdeckung des neuronalen Substrats für Vorhersagefehler bis hin zur Verwendung ähnlicher Prinzipien zum Aufbau künstlicher Intelligenz, die in Geschicklichkeitsspielen wie Go die besten menschlichen Spieler schlagen kann. Bisher lag der Forschungsschwerpunkt auf dem Lernen durch wiederholte Interaktionen mit ein und derselben Situation. Dabei ist...

Unravelling the Making of Real Utopias

Adrian Eugenio Beling
Die immer offensichtlicher werdende Verflechtung der vielfältigen sozialen und ökologischen Krisen stellt Risikogesellschaften weltweit vor der Herausforderung, grundlegende Transformationen der vorherrschenden gesellschaftlichen Modelle und Lebensweisen vorzunehmen, welche sich an den kulturellen Vorstellungen des wohlhabenden globalen Nordens orientieren. Bisher haben sich jedoch sowohl internationale als auch lokale Versuche, globale Entwicklungspfade in Richtung „faire und nachhaltige“ Zukunft zu lenken, als weitgehend erfolglos erwiesen. Der weltweite Ressourcenverbrauch und die Degradierung der Biosphäre haben sich weiter verschärft und beschleunigt....

The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire

S. Moosavi, Danny Kojda, Maximilian Kockert, Saskia Fischer, Michael Kroener & Peter Woias
In order to study the thermoelectric properties of individual nanowires, a thermoelectric nanowire characterization platform (TNCP) has been previously developed and used in our chair. Here, we report on a redesigned platform aiming to optimize performance, mechanical stability and usability. We compare both platforms for electrical conductivity and the Seebeck coefficient for an individual Ag nanowire of the previously-used batch and for comparable measurement conditions. By this, the measurement performance of both designs can be...

Stochastic Optimization under Probust and Dynamic Probabilistic Constraints: with Applications to Energy Management

Tatiana Carolina González Grandón
Diese Arbeit liefert, in den ersten beiden Kapiteln einen allgemeinen Überblick über die klassischen Ansätze zur Optimierung unter Unsicherheit mit einem Schwerpunkt auf probabilistischen Randbedingung. Anschließend wird im dritten Kapitel eine neue Klasse von sogenannten Probust Randbedingungen beim Auftreten von Modellen mit unsicheren Parametern mit teilweise stochastischem und teilweise nicht-stochastischem Charakter eingeführt. Wir zeigen dabei die Relevanz dieser Aufgabentypen für zwei Problemstellungen in einem stationären Gasnetz auf. Erstens liegen beim Gastransport probabilistische Randbedingungen bezüglich der...

Does Intraindividual Variability of Personality States Improve Perspective Taking? An Ecological Approach Integrating Personality and Social Cognition

Richard Wundrack, Julia Prager, Eva Asselmann, Garret O’Connell & Jule Specht
Research integrating cognitive abilities and personality has focused on the role of personality traits. We propose a theory on the role of intraindividual variability of personality states (hereafter state variability) on perspective taking, in particular, the ability to infer other peoples’ mental states. First, we review the relevant research on personality psychology and social cognition. Second, we propose two complementary routes by which state variability relates to anchoring and adjustment in perspective taking. The first...

Implications of Pixel Quality Flags on the Observation Density of a Continental Landsat Archive

Stefan Ernst, Leo Lymburner & Josh Sixsmith
Pixel quality (PQ) products delivered with Analysis Ready Data (ARD) provide users with information about the conditions of the surface, atmosphere, and sensor at the time of acquisition. Knowing whether an observation was affected by clouds or sensor saturation is crucial when selecting data to include in automated analysis, as imperfect or erroneous observations are undesirable for most applications. There is, however, a certain rate of commission error in cloud detection, and saturation may not...

Overconvergent Frèchet Algebras in Rigid Analysis

Ugur Dogan
Wir fixeren einen Körper k, der bezüglich eines nicht-archimedischen Absolutbetrags vollständig ist. In Kapitel 1 konstruieren wir eine Algebra U bestehend aus überkonvergenten Funktionen. Sie ist eine Unteralgebra der Tate-Algebra, wobei mittels einer sogenannten Filterfunktion, eine zusätzliche Wachstumsbedingung an die Koeffizienten der Potenzreihen in U gestellt wird. In diesem Kontext beweisen wir das folgende Resultat: U ist ein Noetherscher, Jacobsonscher, faktorieller Integritätsbereich, der bezüglich der Norm vollständig ist, und jedes Ideal in U ist abgeschlossen...

Wind Energy Potential of Gaza Using Small Wind Turbines: A Feasibility Study

Mohamed Elnaggar, Ezzaldeen Edwan & Matthias Ritter
In this paper, we conduct a feasibility study of the wind energy potential in Gaza, which suffers from a severe shortage of energy supplies. Our calculated energy harvested from the wind is based on data for a typical meteorological year, which are fed into a small wind turbine of 5 kW power rating installable on the roof of residential buildings. The expected annual energy output at a height of 10 m amounts to 2695 kWh,...

Sol-Gel-Synthesis of Nanoscopic Complex Metal Fluorides

Alexander Rehmer, Kerstin Scheurell, Gudrun Scholz & Erhard Kemnitz
The fluorolytic sol-gel synthesis for binary metal fluorides (AlF3, CaF2, MgF2) has been extended to ternary and quaternary alkaline earth metal fluorides (CaAlF5, Ca2AlF7, LiMgAlF6). The formation and crystallization of nanoscopic ternary CaAlF5 and Ca2AlF7 sols in ethanol were studied by 19F liquid and solid state NMR (nuclear magnetic resonance) spectroscopy, as well as transmission electron microscopy (TEM). The crystalline phases of the annealed CaAlF5, Ca2AlF7, and LiMgAlF6 xerogels between 500 and 700 °C could...

Understanding Human Actions and Institutional Change: What Are the Impacts of Power Asymmetries on Efficiency in Pasture Use?

Ulan Kasymov & Dimitrios Zikos
The paper investigates actions and decisions of agricultural resource users and explores their implications for institutional change and natural resource management in the post-socialist context of Central Asia. More specifically, the authors propose a novel methodological approach for the aforementioned context to support policy-relevant research that explicitly addresses behavioral responses of pastoralists in Kyrgyzstan. The paper builds on distributive and economic theories of institutional change and combines findings from lab and field framed economic experiments...

African Nightshade (Solanum scabrum Mill.): Impact of Cultivation and Plant Processing on Its Health Promoting Potential as Determined in a Human Liver Cell Model

Grace Akinyi Odongo, Nina Schlotz, Susanne Baldermann, Susanne Neugart, Susanne Huyskens-Keil, Benard Ngwene, Bernhard Trierweiler, Monika Schreiner & Evelyn Lamy
Plant cultivation and processing may impact nutrient and phytochemical content of vegetables. The present study aimed at determining the influence of cultivation and processing on the health promoting capacity of African nightshade (Solanum scabrum Mill.) leaves, an indigenous vegetable, rich in nutrients and phytochemicals. Anti-genotoxicity against the human liver carcinogen aflatoxin B1 (AFB1) as determined by the comet assay and radical oxygen species (ROS) scavenging capacity of ethanolic and aqueous extracts were investigated in human...

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