This paper deals with a comparison between digital and analogue implementation of a synchronous detection algorithm. The commonly used implementation methods of synchronous detection are presented in the paper. The paper describes FPGA-based digital and analogue hardware approaches, focusing on the digital design. The characteristics of used analogue-to-digital converters are measured. Both proposed approaches are directly compared in terms of sensitivity and long-term stability. The achieved results, along with identified limitations and proposed improvements are widely discussed.
The aim of this study was the evaluation of the influence of head surface roughness on the wear of the acetabular component of implant. The experiments were executed for the combination of UHMWPE (Ultra High Molecular Weight Polyethylene) implant cup and metal head of implant with several different surface roughnesses. Testing method was based on Pin-on-Disc principle. Finally the recommendation for head surface roughness was established. The special experiments were carried out in accredited “Mechanical Testing Laboratory” (quality system ISO 17025) in collaboration with the Academy of Sciences of the Czech Republic and company BEZNOSKA Corporation - developing and producing bone-substitute biomaterials and implants.
This article deals with very specific wear resistance testing of the biomaterials used for surgical implants. The abrasion is indispensable parameter for evaluation of the mechanical properties of these materials. This type of testing is very important for appreciation of new direction in total knee replacement, based on a new combination of biomaterials. The special wear resistance test is called "RING ON DISC". The experiments were carried out on the system MTS 858 MINI BIONIX placed in "Laboratory of Biomechanics of Man" at the Czech Technical University in Prague.
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