Refine
Year of publication
- 2014 (301) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (65)
- Fachbereich Chemie und Biotechnologie (46)
- Fachbereich Elektrotechnik und Informationstechnik (43)
- Fachbereich Wirtschaftswissenschaften (41)
- Fachbereich Energietechnik (40)
- INB - Institut für Nano- und Biotechnologien (35)
- IfB - Institut für Bioengineering (25)
- Fachbereich Maschinenbau und Mechatronik (21)
- Fachbereich Luft- und Raumfahrttechnik (13)
- Fachbereich Bauingenieurwesen (12)
Document Type
- Article (142)
- Conference Proceeding (67)
- Part of a Book (30)
- Book (21)
- Conference: Meeting Abstract (15)
- Report (8)
- Other (6)
- Bachelor Thesis (3)
- Patent (2)
- Part of a Periodical (2)
- Conference Poster (1)
- Doctoral Thesis (1)
- Master's Thesis (1)
- Video (1)
- Talk (1)
Keywords
This paper develops a new finite element method (FEM)-based upper bound algorithm for limit and shakedown analysis of hardening structures by a direct plasticity method. The hardening model is a simple two-surface model of plasticity with a fixed bounding surface. The initial yield surface can translate inside the bounding surface, and it is bounded by one of the two equivalent conditions: (1) it always stays inside the bounding surface or (2) its centre cannot move outside the back-stress surface. The algorithm gives an effective tool to analyze the problems with a very high number of degree of freedom. Our numerical results are very close to the analytical solutions and numerical solutions in literature.
This paper describes two courses on
simulation methods for graduate students:
“Simulation Methods” and “Simulation and
Optimization in Virtual Engineering” The
courses were planned to teach young engineers
how to work with simulation software as well as
to understand the necessary mathematical background.
As simulation software COMSOL is
used. The main philosophy was to combine
theory and praxis in a way that motivates the
students. In addition “soft skills” should be
improved. This was achieved by project work as
final examination. As underlying didactical principle
the ideas of Bloom’s revised taxonomy
were followed. The paper basically focusses on
educational aspects, e.g. how to structure the
course, plan the exercises, organize the project
work and include practical COMSOL examples.
Die Marktübersicht „Unterschiedliche Entwicklungsansätze von Multiplattform-Anwendungen“ richtet sich an IT-Dienstleister, Entwickler und IT-Abteilungen von Unternehmen, die Multiplattform Anwendungen entwickeln. In dieser Marktübersicht werden verschiedene Entwicklungsansätze beschrieben und ihre jeweiligen Vor- und Nachteile aufgezeigt.
Among the variety of transducer concepts proposed for label-free detection of biomolecules, the semiconductor field-effect device (FED) is one of the most attractive platforms. As medical techniques continue to progress towards diagnostic and therapies based on biomarkers, the ability of FEDs for a label-free, fast and real-time detection of multiple pathogenic and physiologically relevant molecules with high specificity and sensitivity offers very promising prospects for their application in point-of-care and personalized medicine for an early diagnosis and treatment of diseases. The presented paper reviews recent advances and current trends in research and development of different FEDs for label-free, direct electrical detection of charged biomolecules by their intrinsic molecular charge. The authors are mainly focusing on the detection of the DNA hybridization event, antibody-antigen affinity reaction as well as clinically relevant biomolecules such as cardiac and cancer biomarkers.
An array of electrically isolated nanoplate field-effect silicon-on-insulator (SOI) capacitors as a new transducer structure for multiparameter (bio-)chemical sensing is presented. The proposed approach allows addressable biasing and electrical readout of multiple nanoplate field-effect capacitive (bio-)chemical sensors on the same SOI chip, as well as differential-mode measurements. The realized sensor chip has been applied for pH and penicillin concentration measurements, electrical monitoring of polyelectrolyte multilayer formation, and the label-free electrical detection of consecutive deoxyribonucleic acid (DNA) hybridization and denaturation events.
Die Informationsbroschüre „Elektromobilität in einer vernetzten Welt“ richtet sich an IT-Dienstleister. In dieser Broschüre werden mögliche Potenziale im Bereich der Elektromobilität aufgezeigt. Die Mobilität der Zukunft ist eine interdisziplinäre Angelegenheit und kein reines Automotive-Thema mehr. Beispiele wie Mobilitätsmanagement, eCommerce und Individualisierung sind im Mobilitätsbereich für die IT-Branche relevant.
In this work the transient simulations of four hybrid solar tower power plant concepts with open-volumetric receiver technology for a location in Barstow-Daggett, USA, are presented. The open-volumetric receiver uses ambient air as heat transfer fluid and the hybridization is realized with a gas turbine. The Rankine cycle is heated by solar-heated air and/or by the gas turbine's flue gases. The plant can be operated in solar-only, hybrid parallel or combined cycle-only mode as well as in any intermediate load levels where the solar portion can vary between 0 to 100%.
The simulated plant is based on the configuration of a solar-hybrid power tower project, which is in planning for a site in Northern Algeria. The meteorological data for Barstow-Daggett was taken from the software meteonorm. The solar power tower simulation tool has been developed in the simulation environment MATLAB/Simulink and is validated.
This study describes a label-free impedimetric sensor based on short ssDNA recognition elements for the detection of hybridization events. We concentrate on the elucidation of the influence of target length and recognition sequence position on the sensorial performance. The impedimetric measurements are performed in the presence of the redox system ferri-/ferrocyanide and show an increase in charge transfer resistance upon hybridization of ssDNA to the sensor surface. Investigations on the impedimetric signal stability demonstrate a clear influence of the buffers used during the sensor preparation and the choice of the passivating mercaptoalcanol compound. A stable sensor system has been developed, enabling a reproducible detection of 25mer target DNA in the low nanomolar range. After hybridization, a sensor regeneration can be reached with deionized water by adjustment of effective convection conditions, ensuring a sensor reusability. By investigations of longer targets with overhangs exposed to the solution, we can demonstrate applicability of the impedimetric detection for longer ssDNA. However, a decreasing charge transfer resistance change (ΔRct) is found by extending the overhang. As a strategy to increase the impedance change for longer target strands, the position of the recognition sequence can be designed in a way that a small overhang is exposed to the electrode surface. This is found to result in an increase in the relative Rct change. These results suggest that DNA and consequently negative charge near the electrode possess a larger impact on the impedimetric signal than DNA further away.
Die Informationsbroschüre „3D-Druck – Prozessmanagement für individualisierte Massenprodukte“ richtet sich an 3D-Druckdienstleister, die additive Fertigungsverfahren (Additive Manufacturing) nutzen, sowie an IT-Dienstleister, die eine Plattform für den Datenaustausch und die Individualisierung anbieten.
Mit der additiven 3D-Drucktechnologie erfolgt die Fertigung von Produkten durch einen schichtweisen Aufbau. In dieser Broschüre werden mögliche Potenziale im Bereich der Herstellung mittels additiver Fertigungsverfahren aufgezeigt.