A5080873185- Orthopaedic implants and arthroplasty
- Hip and Femur Fractures
- Bone fractures and treatments
- Hip disorders and treatments
- Atomic and Molecular Physics
- Gas Sensing Nanomaterials and Sensors
- X-ray Spectroscopy and Fluorescence Analysis
- Mechanical and Optical Resonators
- Analytical Chemistry and Sensors
- Orthopedic Surgery and Rehabilitation
- Bone health and osteoporosis research
- Laser Material Processing Techniques
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Advanced optical system design
- Calibration and Measurement Techniques
- Elbow and Forearm Trauma Treatment
- Advanced X-ray Imaging Techniques
- Carbon Nanotubes in Composites
- Cardiac, Anesthesia and Surgical Outcomes
- Additive Manufacturing Materials and Processes
- Ear and Head Tumors
- Medical and Biological Sciences
- Elasticity and Material Modeling
- Orthopedic Infections and Treatments
Teles (Germany)
2018-2023
ETH Zurich
2018-2020
Space Telescope European Coordinating Facility
2019
Berufsgenossenschaftliche Unfallklinik Murnau
2009-2016
Max Planck Institute for Nuclear Physics
2012-2015
Paracelsus Medical University
2011-2013
University of Salzburg
2012
Universitätsklinikum Erlangen
2010-2011
Weatherford College
2009
The aim of this study was to test the hypothesis that a reinforced gamma nail for fixation subtrochanteric fractures would experience less stress during loading compared with common nail. issue whether use stronger implant result in more shielding surrounding bone also addressed. A finite element analysis (FEA) synthetic employed calculate distribution and two fracture types (AO 31-A3.1 AO 31-A3.3). FEA validated by mechanical tests on six femurs. To vitro, pairs fresh-frozen human femurs...
Photoabsorption by and fluorescence of the $K\ensuremath{\alpha}$ transitions in highly charged iron ions are essential mechanisms for x-ray radiation transfer astrophysical environments. We study photoabsorption due to main from heliumlike fluorinelike (${\mathrm{Fe}}^{24+}$ ${\mathrm{Fe}}^{17+}$) using monochromatic x rays around 6.6 keV at PETRA III synchrotron photon source. Natural linewidths were determined with hitherto unattained accuracy. The observed particular interest...
The choice of the appropriate implant continues to be critical for fixation unstable hip fractures. Therefore, goal this study was develop a numerical model investigate mechanical performance fracture osteosynthesis. We hypothesized that decreasing stability results in increasing load share and therefore higher stress within implant. also investigated relationship interfragmentary movement stability. A finite element developed cephalomedullary nail synthetic femur simulated pertrochanteric...
Storage and cooling of highly charged ions require ultra-high vacuum levels obtainable by means cryogenic methods. We have developed a linear Paul trap operating at 4 K capable very long ion storage times about 30 h. A conservative upper bound the H(2) partial pressure 10(-15) mbar (at K) is obtained from this. External injection possible optimized optical access for lasers provided, while exposure to black body radiation minimized. First results its operation with atomic molecular are...
It has been observed clinically that the Z-effect is a potential cause of failure an intramedullary nail with two cephalic screws. describes migration behavior screws in femoral head. The primary objective was to examine different screw configurations and test load distribution between them as function their relative placement movement nail. hypothesized positions may have influence on stress implant bone therefore failures, such Z-effect. To quantify dual (Citieffe, Calderara di Reno, BO,...
We present absolute measurements of radiative and Auger decay rates $K\ensuremath{-}\text{shell}$ vacancies in highly charged iron ions. The ions were resonantly excited with monochromatic x rays from the PETRA III synchrotron source. By measuring x-ray fluorescence simultaneously, transition could be determined independently most experimental parameters. results confirm theoretical calculations, which are essential to model photoexcited plasmas binary stars active galactic nuclei.
The powder bed additive manufacturing process selective laser melting (SLM) enables designers and engineers to overcome restrictions of conventional technologies. potential fabricating complex lightweight structures processing advanced materials is a key feature for enhancing further development high performance components space applications. Due specific stiffness thermal expansion coefficient very close electroless nickel, which an advantageous optical coating material, the hypereutectic...
The purpose of this study was to address the question how stability a proximal hip fracture determines fatigue and failure mechanism an intramedullary implant. To answer question, mechanical experiments finite element simulations with two different loading scenarios were conducted. load differed in support by artificial bone sleeve, representing femoral head neck. confirmed that nail fails at lower unstable situation femur than stable fracture. nails failed 28 per cent Hence, is crucial...
Nanowire sensors show great promise in a variety of sensing applications due to their potential for high sensitivities. Practical nanowire sensor systems, however, are often limited by low-frequency, 1/f noise. This work presents theoretical and experimental results comparing the performance metrics schemes using transient steady-state parameters presence Criteria derived when considered or will have better signal-to-noise ratio (SNR). The SNR these applied data from carbon nanotube NO2...
To determine whether a new femoral neck plate has higher risk for secondary fracture after implant removal than the current standard treatment intracapsular hip fractures.Six pairs of human cadaver femora (age, 56 ± 5.6 years; range, 48-64 two female and four male donors) were instrumented with (FNP) or compression screw combined an antirotation (CHS) in paired study design. After implants, axial tests to failure bones conducted. Maximum force was determined. Axial stiffness before surgery...
For over a decade, the x-ray astrophysics community has enjoyed fruitful epoch of discovery largely as result successful launch and operation high resolution, sensitivity spectrometers on board Chandra, XMM-Newton Suzaku observatories. With calorimeter spectrometer Astro-H observatory in 2014, diagnostic power resolution spectroscopy will be extended to some hottest, largest most exotic objects our Universe. The utility these is directly coupled to, often limited by, understanding production...
Suspended individual carbon nanotubes show great promise in use as gas sensors, they are not only highly sensitive and selective, but can be operated at a few μW of power consumption. This work reports on novel architecture process flow to reduce the voltage range needed for full sensor characterization values given by modern technology. The developed fast flexible fabrication run yields CNTFET devices with varying gate distances, improving coupling up 25 times previous own studies. Devices...
<h3>BACKGROUND AND PURPOSE:</h3> Computed tomography is an essential modality for imaging of the temporal bone. Newest generation scanners allow coverage large examination volumes with a single gantry rotation. The objective this study was to compare 128-section SST (1 rotation x-ray tube) conventional spiral MSCT (ultra-high-resolution mode) <h3>MATERIALS METHODS:</h3> Fifty-four bones in 27 patients were scanned both and SST. After blinding randomization examinations, 2 observers assessed...
Advanced Manufacturing (AM) has the potential to improve existing technologies and applications in terms of performance, light-weighting costs. In context SME4ALM initiative, launched by DLR ESA, company Kampf Telescope Optics GmbH (KTO) cooperation with Fraunhofer Institute for Material Beam Technology (IWS) have assessed feasibility AM build a high-performance optical mirror space applications. For assessment potentials, design concept cryogenic instruments observations IR NIR range was...
The Environmental Mapping and Analysis Program (EnMAP) is a German hyperspectral satellite mission that aims at monitoring characterizing the Earth's environment on global scale. Its imager (HSI) capable of measuring solar radiance reflected from surface as continuous spectrum in spectral range 420 nm to 2450 nm.