A5010485588- Terahertz technology and applications
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Acoustic Wave Resonator Technologies
- Superconducting and THz Device Technology
- Photonic Crystals and Applications
- Epilepsy research and treatment
- Plant and animal studies
- Semiconductor Quantum Structures and Devices
- Machine Learning in Materials Science
- Semiconductor Lasers and Optical Devices
- Blood groups and transfusion
- Gyrotron and Vacuum Electronics Research
- Fractal and DNA sequence analysis
- Advanced Measurement and Metrology Techniques
- Pharmacological Effects and Toxicity Studies
- Monoclonal and Polyclonal Antibodies Research
- Photonic Crystal and Fiber Optics
- Insect and Arachnid Ecology and Behavior
- Food Drying and Modeling
- Thermography and Photoacoustic Techniques
- Advanced Clustering Algorithms Research
- Neuroscience and Neuropharmacology Research
- Radiomics and Machine Learning in Medical Imaging
- Protein purification and stability
ERN GUARD-Heart
2022
Kepler Universitätsklinikum
2020-2022
Research Center for Non Destructive Testing (Austria)
2011-2016
Johannes Kepler University of Linz
2000
We present a practicable way to take advantage of the spectral information contained in broadband terahertz pulse for determination birefringence and orientation optical axis glass fiber reinforced polymer with single measurement. Our setup employs circularly polarized waves polarization-sensitive detector measure both components electromagnetic field simultaneously. The anisotropic parameters are obtained from an analysis phase frequency resolved field. This method shows high tolerance...
High counts of averaged interictal epileptiform discharges (IEDs) are key components accurate electric source imaging (ESI) in patients with focal epilepsy. Automated detections may be time-efficient, but they need to identify the correct IED types. Thus we compared semiautomated and automated detection types long-term video-EEG (electroencephalography) monitoring (LTM) using an extended scalp EEG array short-term high-density (hdEEG) visual seizure-onset zone (SOZ).We prospectively...
Telecentric beam scanning using f-θ lenses offers nearly uniform spot size, linear displacement, and normal incidence angle over a planar surface. These unique properties allow for the minimization of imaging distortion wide field-of-view. In this article, we present numerical method designing custom in THz regime. We fabricated three made from different commonly used polymer materials optics. demonstrated their optical performance metrics compared to conventional plano-convex lens broadband...
In this work, we develop a pulsed terahertz imaging system in reflection geometry, where due to scanning of the beam neither sample nor emitter and detector have be moved. We use two mirror galvanoscanner for deflecting beam, combination with single rotationally symmetric focusing lens. order efficiently image planar structures, an advanced routine that resolves all bending effects plane already during measurement. Thus, measurement time is reduced, efficient surfaces interfaces becomes...
Polarization-sensitive (PS) terahertz (THz) technology can be used for investigating anisotropic materials that are opaque visible light. A full characterization of an material requires the extraction birefringence as well orientation optical axis from measurement data. We present approach based on THz time-domain spectroscopy (TDS) exploits spectral content signal determining these two parameters only measurements. In contrast to earlier with a more sophisticated PS-THz system and...
Abstract Background Positron emission tomography (PET) and single-photon computed (SPECT) are applied in epilepsy mostly during presurgical assessment. Nonlesional focal is very challenging for evaluation cases of refractory epilepsy. Objectives We aimed to investigate the contribution PET SPECT focus localization nonlesional Methods The basic principles including different tracers were reviewed. literature most recent publications discussed view findings Results Ictal shows a high...
We apply terahertz (THz) time-domain spectroscopy for monitoring the curing process of three different light-curing dental composites. Exact knowledge sample thickness is required a precise determination THz dielectric parameters, as materials exhibit shrinkage when they are cured. find very small but significant changes refractive index and absorption coefficient during stepwise light exposure. The in correlated with density materials. Furthermore, found to give most reliable result
OBJECTIVE Contemporary oncological paradigms for adjuvant treatment of low- and intermediate-grade gliomas are often guided by a limited array parameters, overlooking the dynamic nature disease. The authors’ aim was to develop comprehensive multivariate glioma growth model based on multicentric data, facilitate more individualized therapeutic strategies. METHODS Random slope models with subject-specific random intercepts were fitted retrospective cohort grade II III from database at Kepler...
Aiming at a handheld sensor to characterize chemical compositions, we propose fully integrated absorption based on infrared (IR) in the evanescent field region of an monomode waveguide utilizing thermally generated and detected IR radiation. For coupling, two grating couplers are employed, which couple broadband thermal radiation into attenuated output toward detector, respectively. To achieve spectroscopic measurement, utilize dispersive feature coupler, couples beams out angles depending...
Terahertz time-domain spectroscopic imaging (THz-TDS imaging) producesimages with hundreds of channels. Automatic as well manual imageanalysis is therefore difficult. We propose to use a feature set thatreduces the number channels down 21 and still preserves all importantinformation. Both spectral features areincluded in this set, thereby information aboutdifferent content gained. show practicalapplicability approach, by using it on images from different areas interest. Wefurthermore...
The optical parameters (refractive index, absorption coefficient) of opaque dielectric materials can be measured with terahertz (THz) Time-Domain spectroscopy (TDS). By using a THz beam known polarization and measuring both components the transmitted field, it is possible to determine birefringence present in an anisotropic material. In this work we used sensitive (PS) TDS strain-induced stretched elastomers.
We determine the orientation of glass fibers in samples consisting single and double layers oriented by sensing polarization transmitted THz-beam. Four different types are investigated results compared.
We present a novel measurement method to continuously measure the temporal position and amplitude of terahertz (THz) pulse in typical time-domain setup. Currently we have achieved sampling time 50 Hz resolution less than 10 μm. The is therefore very well suited for online measurements production processes monitor thickness inhomogeneities composition nonconducting materials.
Abstract When working with polymeric compounds containing metallic particles, it is essential to know the influence of shear rate different screw elements in a co-rotating twin-screw extruder (TSE) on particle size distribution and shape. Particle form are significant for various processing conditions. A large variety TSE mixing wide range complex geometries available pigments. In this case study, we investigated feasibility extruding powder coatings pigments as replacement conventional...
An enhanced measurement system for terahertz pulsed imaging is presented that capable of effectively performing en-face and three-dimensional scans planar curved surfaces. The bending the scanning surface in one direction compensated by synchronously advancing mechanical delay time with deflection a mirror. second mirror fast forms telecentric does not exhibit phase distortion.
We develop a stacking technique for precisely measuring the terahertz (THz) refractive index and absorption coefficient of low-absorbing polyethylene. Due to an increased interaction length more reliable results with considerably smaller confidence intervals are obtained.
In this paper we apply THz time-domain spectroscopy for monitoring the curing process of dental composites. We find very small but significant changes dielectric parameters during stepwise curing. Due to shrinking composites, exact knowledge sample thickness is required.
An advanced THz imaging setup in reflection geometry is used to determine the optical axis and birefringence within an injection molded part made of a glass fiber reinforced polymer. By using polarization sensitive detection method quasi-circularly polarized pulse orientation fibers are determined single measurement without need rotating with respect sample or matching reference signal. We also propose analytic algorithm extract parameters from spectral components field.
We discuss a statistical model for antibody-antigen unbinding. The two macromolecules are assumed to be linked by number of relatively weak bonds (or groups correlated bonds) that open and close statistically. use the preliminary analysis experiments performed in Institute Biophysics at Johannes Kepler University. In these molecules brought into contact using an atomic force microscope; then prescribed time dependent is applied bond distribution times needed pull completely apart measured....