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This paper introduces a new maritime search and rescue system based on S-band illumination harmonic radar (HR). Passive and active tags have been developed and tested while attached to life jackets and a small boat. In this demonstration test carried out on the Baltic Sea, the system was able to detect and range the active tags up to a distance of 5800 m using an illumination signal transmit-power of 100 W. Special attention is given to the development, performance, and conceptual differences between passive and active tags used in the system. Guidelines for achieving a high HR dynamic range, including a system components description, are given and a comparison with other HR systems is performed. System integration with a commercial maritime X-band navigation radar is shown to demonstrate a solution for rapid search and rescue response and quick localization.
An acetoin biosensor based on a capacitive electrolyte–insulator–semiconductor (EIS) structure modified with the enzyme acetoin reductase, also known as butane-2,3-diol dehydrogenase (Bacillus clausii DSM 8716ᵀ), is applied for acetoin detection in beer, red wine, and fermentation broth samples for the first time. The EIS sensor consists of an Al/p-Si/SiO₂/Ta₂O₅ layer structure with immobilized acetoin reductase on top of the Ta₂O₅ transducer layer by means of crosslinking via glutaraldehyde. The unmodified and enzyme-modified sensors are electrochemically characterized by means of leakage current, capacitance–voltage, and constant capacitance methods, respectively.
Bitcoin is a cryptocurrency and is considered a high-risk asset
class whose price changes are difficult to predict. Current research focusses
on daily price movements with a limited number of predictors. The paper at
hand aims at identifying measurable indicators for Bitcoin price movement s
and the development of a suitable forecasting model for hourly changes. The
paper provides three research contributions. First, a set of significant
indicators for predicting the Bitcoin price is identified. Second, the results of
a trained Long Short-term Memory (LSTM) neural network that predicts
price changes on an hourly basis is presented and compared with other
algorithms. Third, the results foster discussions of the applicability of neural
nets for stock price predictions. In total, 47 input features for a period of
over 10 months could be retrieved to train a neural net that predicts the
Bitcoin price movements with an error rate of 3.52 %.
Plant virus-like particles, and in particular, tobacco mosaic virus (TMV) particles, are increasingly being used in nano- and biotechnology as well as for biochemical sensing purposes as nanoscaffolds for the high-density immobilization of receptor molecules. The sensitive parameters of TMV-assisted biosensors depend, among others, on the density of adsorbed TMV particles on the sensor surface, which is affected by both the adsorption conditions and surface properties of the sensor. In this work, Ta₂O₅-gate field-effect capacitive sensors have been applied for the label-free electrical detection of TMV adsorption. The impact of the TMV concentration on both the sensor signal and the density of TMV particles adsorbed onto the Ta₂O₅-gate surface has been studied systematically by means of field-effect and scanning electron microscopy methods. In addition, the surface density of TMV particles loaded under different incubation times has been investigated. Finally, the field-effect sensor also demonstrates the label-free detection of penicillinase immobilization as model bioreceptor on TMV particles.
Der vorliegende Beitrag stellt den seismischen Nachweis von Mauerwerksbauten in Deutschland auf Grundlage der DIN EN 1998‐1/NA vor, wobei auch die wesentlichen Änderungen zu der Norm DIN 4149 vergleichend erläutert werden. Vorgestellt werden die Definition der Erdbebeneinwirkung, das seismische Verhalten von Mauerwerksbauten und die Erläuterung der Rechenverfahren. Darauf aufbauend wird die Anwendung an drei Praxisbeispielen demonstriert.
Inhaltsverzeichnis
1. Whistleblowing – Chancen & Risiken von Hinweisgebersystemen aus Arbeitnehmer- und Arbeitgebersicht
– Michelle Abraham 3-70
2. Die Bedeutung und rechtliche Bewertung von Vesting-Klauseln bei der Venture-Capital Finanzierung einer Start-Up GmbH
– Natalia Ahmadian 71-137
3. Bewertung der Möglichkeit zur Einführung von Tarifverträgen im deutschen Berufsfußball
– Thomas Büttgenbach 138-190
4. Pflichten und Haftungsrisiken des GmbH-Geschäftsführers bei Compliance-Verstößen
– Naja Keller 191-234
5. Aktienrückkäufe auf dem deutschen Markt nach der Finanzkrise 2008/2009
– Marc Paumer 235-287
6. Will Germany reach its 2030 climate goals in the transportation sector? – An investigation focusing on the new German Emission Trading System
– Axel Plum 288-369
Dual frequency magnetic excitation of magnetic nanoparticles (MNP) enables enhanced biosensing applications. This was studied from an experimental and theoretical perspective: nonlinear sum-frequency components of MNP exposed to dual-frequency magnetic excitation were measured as a function of static magnetic offset field. The Langevin model in thermodynamic equilibrium was fitted to the experimental data to derive parameters of the lognormal core size distribution. These parameters were subsequently used as inputs for micromagnetic Monte-Carlo (MC)-simulations. From the hysteresis loops obtained from MC-simulations, sum-frequency components were numerically demodulated and compared with both experiment and Langevin model predictions. From the latter, we derived that approximately 90% of the frequency mixing magnetic response signal is generated by the largest 10% of MNP. We therefore suggest that small particles do not contribute to the frequency mixing signal, which is supported by MC-simulation results. Both theoretical approaches describe the experimental signal shapes well, but with notable differences between experiment and micromagnetic simulations. These deviations could result from Brownian relaxations which are, albeit experimentally inhibited, included in MC-simulation, or (yet unconsidered) cluster-effects of MNP, or inaccurately derived input for MC-simulations, because the largest particles dominate the experimental signal but concurrently do not fulfill the precondition of thermodynamic equilibrium required by Langevin theory.
Venus und Mars
(2021)
Venus und Mars - Mann und Frau. Ein binäres System, welches heutzutage einer ständigen Hinterfragung ausgesetzt ist. Woraus entstand dieses System und wie manipulativ ist das Geschlecht wirklich? Die Pionierwerke der Gender Studies/Queer Studies zeigten auf, dass jeder Mensch sein Geschlecht durch das Imitieren von sozial-gesellschaftlich festgelegten Normen und Werten bildet. Drag-Künstler*innen leben diesen Prozess in einer visuellen Form vor, indem sie Geschlechternormen aufgreifen und sie unabhängig vom biologischen Geschlecht der Darstellenden inszenieren, imitieren, parodieren und neu zusammensetzen. Jede Performance auf den Fotografien greift ebenfalls vorhandene Vorstellungen von Geschlecht auf und interpretiert sie neu: denn Drag kennt kein Original, genauso wenig wie das Geschlecht.
Bei dem Projekt handelt es sich um eine interaktive Station für Jugendliche mit dem Ziel, Manipulation im Alltag zu entlarven und mithilfe von konkreten Beispielen spielerisch zu lernen.
Im Dialog stehen sich Individuen in ständiger Beeinflussung gegenüber. Das Wissen darum kann
bewusst (aus)genutzt werden und den Gesprächspartner zu „unbewusstem“ Handeln verleiten. Eine entsprechende Nutzung zum eigenen Vorteil bezeichnet man als Manipulation. Es soll bei Jugendlichen ein Bewusstsein geschaffen werden, um gezielt Manipulation zu erkennen.
Erstellt wird hierfür eine Installation im Raum mit einer abstrahierten, metaphorischen Darstellung von Manipulation. Die Jugendlichen erfahren sich im interaktiven Part einerseits in der Situation eines Manipulationsopfers und andererseits als Manipulant. Die begehbare Station vermittelt über die Räumlichkeit das Gefühl der Bedrängnis und erzeugt auf plakative Weise eine körperliche Erfahrung einer Bredouille, die im psychischen Zusammenhang zu Manipulation steht.
A new functionalization method to modify capacitive electrolyte–insulator–semiconductor (EIS) structures with nanofilms is presented. Layers of polyallylamine hydrochloride (PAH) and graphene oxide (GO) with the compound polyaniline:poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PANI:PAAMPSA) are deposited onto a p-Si/SiO2 chip using the layer-by-layer technique (LbL). Two different enzymes (urease and penicillinase) are separately immobilized on top of a five-bilayer stack of the PAH:GO/PANI:PAAMPSA-modified EIS chip, forming a biosensor for detection of urea and penicillin, respectively. Electrochemical characterization is performed by constant capacitance (ConCap) measurements, and the film morphology is characterized by atomic force microscopy (AFM) and scanning electron microscopy (SEM). An increase in the average sensitivity of the modified biosensors (EIS–nanofilm–enzyme) of around 15% is found in relation to sensors, only carrying the enzyme but without the nanofilm (EIS–enzyme). In this sense, the nanofilm acts as a stable bioreceptor onto the EIS chip improving the output signal in terms of sensitivity and stability.