Refine
Year of publication
- 2021 (83) (remove)
Document Type
- Article (83) (remove)
Has Fulltext
- no (83) (remove)
Keywords
- Principal component analysis (2)
- capacitive field-effect sensor (2)
- constructive alignment (2)
- examination (2)
- harmonic radar (2)
- long-term retention (2)
- multimodal (2)
- practical learning (2)
- AlterG (1)
- Authenticity (1)
- Bacillus sp (1)
- Bemessung (1)
- Biosolubilization (1)
- Bloom’s Taxonomy (1)
- Bootstrap (1)
- CellDrum (1)
- Competence Developing Games (1)
- DLR-ESTEC GOSSAMER roadmap for solar sailing (1)
- Deuterated solvents (1)
- Deuterium NMR (1)
Institute
- Fachbereich Medizintechnik und Technomathematik (28)
- IfB - Institut für Bioengineering (23)
- Fachbereich Wirtschaftswissenschaften (13)
- Fachbereich Luft- und Raumfahrttechnik (10)
- INB - Institut für Nano- und Biotechnologien (10)
- Fachbereich Chemie und Biotechnologie (8)
- Fachbereich Elektrotechnik und Informationstechnik (5)
- Fachbereich Bauingenieurwesen (4)
- Fachbereich Energietechnik (3)
- Fachbereich Maschinenbau und Mechatronik (3)
- Fachbereich Architektur (2)
- IMP - Institut für Mikrowellen- und Plasmatechnik (2)
- Solar-Institut Jülich (2)
- ZHQ - Bereich Hochschuldidaktik und Evaluation (2)
- ECSM European Center for Sustainable Mobility (1)
- IBB - Institut für Baustoffe und Baukonstruktionen (1)
- MASKOR Institut für Mobile Autonome Systeme und Kognitive Robotik (1)
Biologically sensitive field-effect devices (BioFEDs) advantageously combine the electronic field-effect functionality with the (bio)chemical receptor’s recognition ability for (bio)chemical sensing. In this review, basic and widely applied device concepts of silicon-based BioFEDs (ion-sensitive field-effect transistor, silicon nanowire transistor, electrolyte-insulator-semiconductor capacitor, light-addressable potentiometric sensor) are presented and recent progress (from 2019 to early 2021) is discussed. One of the main advantages of BioFEDs is the label-free sensing principle enabling to detect a large variety of biomolecules and bioparticles by their intrinsic charge. The review encompasses applications of BioFEDs for the label-free electrical detection of clinically relevant protein biomarkers, deoxyribonucleic acid molecules and viruses, enzyme-substrate reactions as well as recording of the cell acidification rate (as an indicator of cellular metabolism) and the extracellular potential.
Eigenkapitalkosten sind eine wesentliche Determinante bei der Wertbestimmung von Unternehmen und Unternehmensteilen. Die Eigenkapitalkosten werden regelmäßig mittels des CAPM bestimmt. Für sog. konzerninterne Routinefunktionen mit geringem Risiko stellt diese Bestimmung mittels CAPM ein Problem dar, da börsennotierte Peergroups für eine zuverlässige Bestimmung des Beta-Faktors meist nicht identifizierbar sind. Damit ergeben sich bei Bewertungen von Routineunternehmen Unsicherheiten und Konfliktpotenzial in steuerlichen Betriebsprüfungen. Dieser Beitrag gibt einen Überblick der in der Praxis genutzten Ansätze und stellt eine theoretische Fundierung zur Bestimmung der Eigenkapitalkosten von konzerninternen Routinefunktionen vor. Dabei wird verdeutlicht, dass Eigenkapitalkosten von konzerninternen Routinefunktionen nicht denen des Gesamtkonzerns entsprechen und Praktikeransätze eine grundsätzliche Berechtigung besitzen.
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.
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.