A5101617841- Plant Water Relations and Carbon Dynamics
- Luminescence Properties of Advanced Materials
- Combustion and flame dynamics
- Fluid Dynamics and Turbulent Flows
- Heat Transfer Mechanisms
- earthquake and tectonic studies
- Geological and Geophysical Studies
- Advanced Chemical Sensor Technologies
- Luminescence and Fluorescent Materials
- Glass properties and applications
- Fluid Dynamics and Heat Transfer
- Solid State Laser Technologies
- Radiation Detection and Scintillator Technologies
- Photonic Crystal and Fiber Optics
- Organic Light-Emitting Diodes Research
- Microwave Dielectric Ceramics Synthesis
- Seismic Imaging and Inversion Techniques
- Laser-induced spectroscopy and plasma
- Thermal Radiation and Cooling Technologies
- Perovskite Materials and Applications
- Hydraulic Fracturing and Reservoir Analysis
- Leaf Properties and Growth Measurement
- Organic Electronics and Photovoltaics
- Particle Dynamics in Fluid Flows
- Remote Sensing in Agriculture
Technische Universität Ilmenau
2019-2022
Freie Universität Berlin
2016
FH Münster
2012-2014
Princeton University
2002
We demonstrate that ordered microlens arrays with 10 μm diam poly-dimethyl-siloxane lenses attached to glass substrates increase the light output of organic emitting devices (OLED) by a factor 1.5 over unlensed substrates. The lenses, which are considerably smaller than, and not aligned OLEDs, outcouple is emitted outside escape cone substrate. show an electrophosphorescent device based on fac tris(2-phenylpyridine)Iridium (Ir(ppy)3) doped layer has its external quantum efficiency increased...
Turbulent superstructures in horizontally extended three-dimensional Rayleigh-B\'enard convection flows are investigated controlled laboratory experiments water at Prandtl number $Pr = 7$. A cell with square cross-section, aspect ratio $\Gamma l/h 25$, side length $l$ and height $h$ is used. Three different Rayleigh numbers the range $10^5 < Ra 10^6$ considered. The accessible optically, such that thermochromic liquid crystals can be seeded as tracer particles to monitor simultaneously...
Abstract Large-scale mean patterns in Rayleigh–Bénard convection, also referred to as turbulent superstructures, have mainly been studied by means of numerical simulations so far, but experimental investigations are still rare. However, the analysis which great importance due their effect on local transport heat and momentum, require both data. Therefore, within scope this study measurements were performed horizontal mid plane a closer top cell with an aspect ratio $$\varGamma =l/h=25$$...
Abstract This study presents an investigation regarding the applicability of neural networks for temperature measurements using thermochromic liquid crystals (TLCs) and discusses advantages as well disadvantages common calibration approaches. For characterization measurement technique, dependency color TLCs on observation angle and, therefore, position within field view a camera is analyzed in detail. In order to consider influence color, are applied measurements. particular, focus this...
Abstract As measurements of velocity and temperature fields are paramount importance for analyzing heat transfer problems, the development characterization measuring techniques is an ongoing challenge. In this respect, optical have become a powerful tool, as both quantities can be measured noninvasively. For instance, combining particle image velocimetry (PIV) thermometry (PIT) using thermochromic liquid crystals (TLCs) tracer particles allows simultaneous measurement with low uncertainty....
In this contribution, a novel imaging approach for Thermochromic Liquid Crystal (TLC) based Particle Image Thermometry (PIT) is demonstrated. contrast to state of the art approaches, multi-spectral camera was used record color response Crystals seeding particles. An experiment with transparent, water-filled, cylindrical cell as central element set up investigate approach. The temperature in can be controlled by adjusting bottom and top plate. Calibration images at eleven different...