A5101462038- Adsorption and Cooling Systems
- Refrigeration and Air Conditioning Technologies
- Advanced Surface Polishing Techniques
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Heat Transfer and Optimization
- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Ocular and Laser Science Research
- Graphene and Nanomaterials Applications
- Heat Transfer and Boiling Studies
- Surface Roughness and Optical Measurements
- Engineering and Materials Science Studies
- Electronic and Structural Properties of Oxides
- Advanced Battery Materials and Technologies
- Innovative concrete reinforcement materials
- Concrete Properties and Behavior
- Optical Coatings and Gratings
- Building Energy and Comfort Optimization
- Material Science and Thermodynamics
- Concrete and Cement Materials Research
- Ion-surface interactions and analysis
- Membrane Separation Technologies
- Advanced NMR Techniques and Applications
University of Florida
2017-2021
Universität Innsbruck
2019
Bern University of Applied Sciences
2012-2014
Robert Bosch (Germany)
2009
Forschungszentrum Jülich
2003
The interest using ultra-short pulsed laser systems for industrial applications increased remarkably as reliable high power with average exceeding several 10W became available, facilitating the development of throughput processes. Exhausting potential these demands an optimized process and adapted strategy well. For surface structuring it can be shown that in case metals many other materials, ablation itself shows a maximum efficiency at optimum fluence. corresponding removal rate directly...
For laser micro processing with short and ultra-short pulses the threshold fluence is affected by incubation changes number of applied. In general effect described a power function including coefficient S. Beside also energy penetration depth subject to effect; moreover it main cause for change increasing pulse number. The behavior can be explained varying absorption (due in surface reflectivity), chemical (e.g. due oxidation) or microstructure material whereas could latter two effects but...
Ultra short laser pulses are used, when high requirements concerning machining quality demanded. The cost- effectiveness plays an important role for a successful transfer of this technology into industrial applications. Therefore systems with longer ps-pulses could offer attractive alternative compared to ps- and fs systems. Beside fiber based ∼50 ps pulse durations also small sub-ns available today. In contrast the dramatic drop material removal rate duration is raised from 10 50 impact...
For understanding and optimizing laser processing of metals alloys the optical properties, especially absorption work piece in function temperature up to liquid phase have be known [1]. There are several approaches extend Drude-Model [2] for properties metal dependence [3, 4, 5]. However, a verification these models is difficult due lack sufficient experimental data. Even though measuring with ellipsometry well established, such measurements on at elevated temperatures state very...
The reaction kinetic of Portland cement was characterized by heat flow calorimetry, with the experiments conducted at different, constant, curing temperatures. With these data hand, Ulm and Coussy’s classical rate law is extended toward a variable activation energy, reflecting that several sub-reactions take place in parallel/subsequently, what, finally, gives access to an engineering model for hydration kinetics suitable application thermochemical analyses concrete structures early age.
Abstract Advancing the knowledge of surfaces and protein interactions is paramount to development non‐fouling membranes for many applications, particularly continuous blood flow wearable implantable devices. Here, highly controlled experiments understand effect graphene oxide (GO) surface properties on its adsorption are presented. A newly developed self‐assembly process implemented build a GO membrane with an atomically smooth eliminate roughness adsorption. The oxidation level varied...