Refine
Year of publication
- 2021 (282) (remove)
Document Type
- Article (102)
- Bachelor Thesis (89)
- Conference Proceeding (50)
- Part of a Book (17)
- Book (9)
- Master's Thesis (4)
- Report (3)
- Doctoral Thesis (2)
- Review (2)
- Other (1)
- Part of Periodical (1)
- Preprint (1)
- Working Paper (1)
Keywords
- Corporate Design (6)
- Animation (5)
- Fotografie (4)
- Illustration (4)
- Nachhaltigkeit (4)
- UX Design (4)
- App (3)
- Botanik (3)
- Dokumentation (3)
- Gamification (3)
- Gesundheit (3)
- Holz (3)
- Layout (3)
- Lebensmittel (3)
- Mode (3)
- Museum (3)
- Redesign (3)
- Baukastensystem (2)
- Bookazine (2)
- Corona (2)
Institute
- Fachbereich Gestaltung (94)
- Fachbereich Medizintechnik und Technomathematik (55)
- IfB - Institut für Bioengineering (36)
- Fachbereich Elektrotechnik und Informationstechnik (26)
- Fachbereich Energietechnik (23)
- Fachbereich Wirtschaftswissenschaften (21)
- Fachbereich Luft- und Raumfahrttechnik (20)
- INB - Institut für Nano- und Biotechnologien (15)
- Fachbereich Bauingenieurwesen (13)
- Fachbereich Chemie und Biotechnologie (11)
- Fachbereich Maschinenbau und Mechatronik (11)
- Solar-Institut Jülich (11)
- ECSM European Center for Sustainable Mobility (9)
- MASKOR Institut für Mobile Autonome Systeme und Kognitive Robotik (7)
- Nowum-Energy (5)
- IBB - Institut für Baustoffe und Baukonstruktionen (3)
- Fachbereich Architektur (2)
- IMP - Institut für Mikrowellen- und Plasmatechnik (2)
- ZHQ - Bereich Hochschuldidaktik und Evaluation (2)
- Arbeitsstelle fuer Hochschuldidaktik und Studienberatung (1)
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.
Photoelectrochemical (PEC) biosensors are a rather novel type of biosensors thatutilizelighttoprovideinformationaboutthecompositionofananalyte,enablinglight-controlled multi-analyte measurements. For enzymatic PEC biosensors,amperometric detection principles are already known in the literature. In con-trast, there is only a little information on H+-ion sensitive PEC biosensors. Inthis work, we demonstrate the detection of H+ions emerged by H+-generatingenzymes, exemplarily demonstrated with penicillinase as a model enzyme on atitanium dioxide photoanode. First, we describe the pH sensitivity of the sensorand study possible photoelectrocatalytic reactions with penicillin. Second, weshow the enzymatic PEC detection of penicillin.
This paper presents the laser-based powder bed fusion (L-PBF) using various glass powders (borosilicate and quartz glass). Compared to metals, these require adapted process strategies. First, the glass powders were characterized with regard to their material properties and their processability in the powder bed. This was followed by investigations of the melting behavior of the glass powders with different laser wavelengths (10.6 µm, 1070 nm). In particular, the experimental setup of a CO2 laser was adapted for the processing of glass powder. An experimental setup with integrated coaxial temperature measurement/control and an inductively heatable build platform was created. This allowed the L-PBF process to be carried out at the transformation temperature of the glasses. Furthermore, the component’s material quality was analyzed on three-dimensional test specimen with regard to porosity, roughness, density and geometrical accuracy in order to evaluate the developed L-PBF parameters and to open up possible applications.
Plant viruses are major contributors to crop losses and induce high economic costs worldwide. For reliable, on-site and early detection of plant viral diseases, portable biosensors are of great interest. In this study, a field-effect SiO2-gate electrolyte-insulator-semiconductor (EIS) sensor was utilized for the label-free electrostatic detection of tobacco mosaic virus (TMV) particles as a model plant pathogen. The capacitive EIS sensor has been characterized regarding its TMV sensitivity by means of constant-capacitance method. The EIS sensor was able to detect biotinylated TMV particles from a solution with a TMV concentration as low as 0.025 nM. A good correlation between the registered EIS sensor signal and the density of adsorbed TMV particles assessed from scanning electron microscopy images of the SiO2-gate chip surface was observed. Additionally, the isoelectric point of the biotinylated TMV particles was determined via zeta potential measurements and the influence of ionic strength of the measurement solution on the TMV-modified EIS sensor signal has been studied.
Contractile behavior of the gastrocnemius medialis muscle during running in simulated hypogravity
(2021)
Vigorous exercise countermeasures in microgravity can largely attenuate muscular degeneration, albeit the extent of applied loading is key for the extent of muscle wasting. Running on the International Space Station is usually performed with maximum loads of 70% body weight (0.7 g). However, it has not been investigated how the reduced musculoskeletal loading affects muscle and series elastic element dynamics, and thereby force and power generation. Therefore, this study examined the effects of running on the vertical treadmill facility, a ground-based analog, at simulated 0.7 g on gastrocnemius medialis contractile behavior. The results reveal that fascicle−series elastic element behavior differs between simulated hypogravity and 1 g running. Whilst shorter peak series elastic element lengths at simulated 0.7 g appear to be the result of lower muscular and gravitational forces acting on it, increased fascicle lengths and decreased velocities could not be anticipated, but may inform the development of optimized running training in hypogravity. However, whether the alterations in contractile behavior precipitate musculoskeletal degeneration warrants further study.
Experimental and numerical investigation on the effect of pressure on micromix hydrogen combustion
(2021)
The micromix (MMX) combustion concept is a DLN gas turbine combustion technology designed for high hydrogen content fuels. Multiple non-premixed miniaturized flames based on jet in cross-flow (JICF) are inherently safe against flashback and ensure a stable operation in various operative conditions.
The objective of this paper is to investigate the influence of pressure on the micromix flame with focus on the flame initiation point and the NOx emissions. A numerical model based on a steady RANS approach and the Complex Chemistry model with relevant reactions of the GRI 3.0 mechanism is used to predict the reactive flow and NOx emissions at various pressure conditions. Regarding the turbulence-chemical interaction, the Laminar Flame Concept (LFC) and the Eddy Dissipation Concept (EDC) are compared. The numerical results are validated against experimental results that have been acquired at a high pressure test facility for industrial can-type gas turbine combustors with regard to flame initiation and NOx emissions.
The numerical approach is adequate to predict the flame initiation point and NOx emission trends. Interestingly, the flame shifts its initiation point during the pressure increase in upstream direction, whereby the flame attachment shifts from anchoring behind a downstream located bluff body towards anchoring directly at the hydrogen jet. The LFC predicts this change and the NOx emissions more accurately than the EDC. The resulting NOx correlation regarding the pressure is similar to a non-premixed type combustion configuration.
The planned coal phase-out in Germany by 2038 will lead to the dismantling of power plants with a total capacity of approx. 30 GW. A possible further use of these assets is the conversion of the power plants to thermal storage power plants; the use of these power plants on the day-ahead market is considerably limited by their technical parameters. In this paper, the influence of the technical boundary conditions on the operating times of these storage facilities is presented. For this purpose, the storage power plants were described as an MILP problem and two price curves, one from 2015 with a relatively low renewable penetration (33 %) and one from 2020 with a high renewable energy penetration (51 %) are compared. The operating times were examined as a function of the technical parameters and the critical influencing factors were investigated. The thermal storage power plant operation duration and the energy shifted with the price curve of 2020
increases by more than 25 % compared to 2015.
With the increased interest for interstellar exploration after the discovery of exoplanets and the proposal by Breakthrough Starshot, this paper investigates the optimisation of photon-sail trajectories in Alpha Centauri. The prime objective is to find the optimal steering strategy for a photonic sail to get captured around one of the stars after a minimum-time transfer from Earth. By extending the idea of the Breakthrough Starshot project with a deceleration phase upon arrival, the mission’s scientific yield will be increased. As a secondary objective, transfer trajectories between the stars and orbit-raising manoeuvres to explore the habitable zones of the stars are investigated. All trajectories are optimised for minimum time of flight using the trajectory optimisation software InTrance. Depending on the sail technology, interstellar travel times of 77.6-18,790 years can be achieved, which presents an average improvement of 30% with respect to previous work. Still, significant technological development is required to reach and be captured in the Alpha-Centauri system in less than a century. Therefore, a fly-through mission arguably remains the only option for a first exploratory mission to Alpha Centauri, but the enticing results obtained in this work provide perspective for future long-residence missions to our closest neighbouring star system.
The existence of several mobile operating systems, such as Android and iOS, is a challenge for developers because the individual platforms are not compatible with each other and require separate app developments. For this reason, cross-platform approaches have become popular but lack in cloning the native behavior of the different operating systems. Out of the plenty cross-platform approaches, the progressive web app (PWA) approach is perceived as promising but needs further investigation. Therefore, the paper at hand aims at investigating whether PWAs are a suitable alternative for native apps by developing a PWA clone of an existing app. Two surveys are conducted in which potential users test and evaluate the PWA prototype with regard to its usability. The survey results indicate that PWAs have great potential, but cannot be treated as a general alternative to native apps. For guiding developers when and how to use PWAs, four design guidelines for the development of PWA-based apps are derived based on the results.
KOMU entstand durch Analysieren der Veränderungen, die mit der Urbanisierung einhergehen - schnell schwindender Wohnraum, häufiges Umziehen und verschmolzene Raumnutzung.
KOMU ist ein modulares Regalsystem, das ermöglicht, problemlos aus denselben Bestandteilen immer wieder verschiedene Wohn- und Raumsituationen zu schaffen.
Das System ist komplett werkzeugfrei durch simples Ineinanderstecken aufzubauen. Weitere Add-Ons können über das gleiche Stecksystem in das Regal integriert werden, damit es perfekt an die Bedürfnisse des Kunden anpasst werden kann.
Durch klare Linien und eine cleane Designsprache fügt sich KOMU nahtlos in seine Umgebung ein und hilft, eine für den Kunden ideale Umgebung zu schaffen.
Ein Regal, das mitwächst - vielfältig und individuell.
Yocu ist ein Konzept für den Gesundheitssektor, dass unter der Betrachtung der relevanten Trends und der Researchergebnisse den Therapieansatz des „Schröpfen“ in einen neuen modernen Kontext setzt, dabei aber die Vorteile der traditionellen Heilkunst nicht außer Acht lässt. Es handelt sich um ein Therapieprodukt für fasziale Verklebungen und Muskel-Skelett-Erkrankungen.
Mit Yocu bekommen Nutzer die Möglichkeit, sich selbst erfolgreich präventiv oder bei Beschwerden zu behandeln. Das könnte nicht nur die körperliche Gesundheit fördern, sondern auch das Gespür für den eigenen Körper. Seine körperlichen Bedürfnisse besser einschätzen zu können und in der Lage zu sein, diese zu erfüllen, stellt das Ziel des Konzepts dar.
Mit dem gewählten „Healthtech“ Ansatz soll der Zugang zur Selbsttherapie für Laien ermöglicht werden. Zusätzlich könnte das Konzept die Arbeit für Physiotherapeut:innen und Fitnesstrainer:innen erleichtern. Durch die Symbiose eines elektronischen Therapieproduktes mit einer Anwendungsapp ist die Behandlung punktgenau steuerbar und basiert nicht mehr ausschließlich auf Gefühl oder Erfahrung. Durch die Einsicht aller wichtigen Parameter, wird das Verständnis der Therapiemethode gefördert und Vertrauen hinsichtlich des Produkts geschaffen.