Article
Refine
Year of publication
- 2019 (95) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (49)
- IfB - Institut für Bioengineering (24)
- INB - Institut für Nano- und Biotechnologien (20)
- Fachbereich Luft- und Raumfahrttechnik (11)
- Fachbereich Energietechnik (9)
- Fachbereich Chemie und Biotechnologie (7)
- Fachbereich Elektrotechnik und Informationstechnik (7)
- Fachbereich Bauingenieurwesen (5)
- Fachbereich Maschinenbau und Mechatronik (4)
- Fachbereich Gestaltung (2)
Language
- English (95) (remove)
Document Type
- Article (95) (remove)
Keywords
- Achilles tendon (1)
- Architectural gear ratio (1)
- Assistive technology (1)
- Automatic control (1)
- Emilia-Romagna earthquake (1)
- Empirical consequence curves (1)
- Empirical fragility functions (1)
- Goodness-of-fit test (1)
- Human-Computer interaction (1)
- Multi-sample problem (1)
- PBEE (1)
- Parametric bootstrap (1)
- Precast buildings (1)
- Rehabilitation engineering (1)
- Running (1)
- Stiffness (1)
- Tendon properties (1)
- Volume of confidence regions (1)
- asymptotic relative efficiency (1)
- concentrating collector (1)
- frequency mixing magnetic detection (1)
- likelihood ratio test (1)
- magnetic actuation (1)
- magnetic sandwich immunoassay (1)
- magnetic separation (1)
- magnetic tweezers (1)
- magnetophoretic velocity (1)
- multinomial distribution (1)
- multiparametric immunoassays (1)
- multivariate normal distribution (1)
- point-focussing system (1)
- raytracing (1)
- solar process heat (1)
- superparamagnetic bead (1)
Is part of the Bibliography
- no (95)
The optical performance of a 2-axis solar concentrator was simulated with the COMSOL Multiphysics® software. The concentrator consists of a mirror array, which was created using the application builder. The mirror facets are preconfigured to form a focal point. During tracking all mirrors are moved simultaneously in a coupled mode by 2 motors in two axes, in order to keep the system in focus with the moving sun. Optical errors on each reflecting surface were implemented in combination with the solar angular cone of ± 4.65 mrad. As a result, the intercept factor of solar radiation that is available to the receiver was calculated as a function of the transversal and longitudinal angles of incidence. In addition, the intensity distribution on the receiver plane was calculated as a function of the incidence angles.
Recent Unmanned Aerial Vehicle (UAV) design procedures rely on full aircraft steady-state Reynolds-Averaged-Navier-Stokes (RANS) analyses in early design stages. Small sensor turrets are included in such simulations, even though their aerodynamic properties show highly unsteady behavior. Very little is known about the effects of this approach on the simulation outcomes of small turrets. Therefore, the flow around a model turret at a Reynolds number of 47,400 is simulated with a steady-state RANS approach and compared to experimental data. Lift, drag, and surface pressure show good agreement with the experiment. The RANS model predicts the separation location too far downstream and shows a larger recirculation region aft of the body. Both characteristic arch and horseshoe vortex structures are visualized and qualitatively match the ones found by the experiment. The Reynolds number dependence of the drag coefficient follows the trend of a sphere within a distinct range. The outcomes indicate that a steady-state RANS model of a small sensor turret is able to give results that are useful for UAV engineering purposes but might not be suited for detailed insight into flow properties.
Suppose we have k samples X₁,₁,…,X₁,ₙ₁,…,Xₖ,₁,…,Xₖ,ₙₖ with different sample sizes ₙ₁,…,ₙₖ and unknown underlying distribution functions F₁,…,Fₖ as observations plus k families of distribution functions {G₁(⋅,ϑ);ϑ∈Θ},…,{Gₖ(⋅,ϑ);ϑ∈Θ}, each indexed by elements ϑ from the same parameter set Θ, we consider the new goodness-of-fit problem whether or not (F₁,…,Fₖ) belongs to the parametric family {(G₁(⋅,ϑ),…,Gₖ(⋅,ϑ));ϑ∈Θ}. New test statistics are presented and a parametric bootstrap procedure for the approximation of the unknown null distributions is discussed. Under regularity assumptions, it is proved that the approximation works asymptotically, and the limiting distributions of the test statistics in the null hypothesis case are determined. Simulation studies investigate the quality of the new approach for small and moderate sample sizes. Applications to real-data sets illustrate how the idea can be used for verifying model assumptions.
An overview on dry low NOx micromix combustor development for hydrogen-rich gas turbine applications
(2019)
Heating efficiency of magnetic nanoparticles decreases with gradual immobilization in hydrogels
(2019)
Bacterial cell appendix formation supports cell-cell interaction, cell adhesion and cell movement. Additionally, in bioelectrochemical systems (BES), cell appendages have been shown to participate in extracellular electron transfer. In this work, the cell appendix formation of Clostridium acetobutylicum in biofilms of a BES are imaged and compared with conventional biofilms. Under all observed conditions, the cells possess filamentous appendages with a higher number and density in the BES. Differences in the amount of extracellular polymeric substance in the biofilms of the electrodes lead to the conclusion that the cathode can be used as electron donor and the anode as electron acceptor by C. acetobutylicum. When using conductive atomic force microscopy, a current response of about 15 nA is found for the cell appendages from the BES. This is the first report of conductivity for clostridial cell appendices and represents the basis for further studies on their role for biofilm formation and electron transfer.