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Ansbach, Germany

The Ansbach University of Applied science was founded in 1996 and counts approximately 1,800 students . It belongs to the newest Universities of Applied science of the Free State of Bavaria. The percentage of foreign students is about 6 percent. As of 2010 there are 2,300 students.Beginning with the winter semester 2006/07 the so-called Bologna Process was implemented. Therefore all academic programs with the German degree “Diplom ” were replaced by bachelor programs.In January 2008 the Ansbach University of Applied science came to first place of the “Hochschulranking” which was processed by UNIcheck.de. Despite the fact that the survey cannot be considered as representative it is still an honour for the young and dynamic university. Wikipedia.

Heling B.,Friedrich - Alexander - University, Erlangen - Nuremberg | Aschenbrenner A.,Friedrich - Alexander - University, Erlangen - Nuremberg | Walter M.S.J.,Ansbach University of Applied Sciences | Wartzack S.,Friedrich - Alexander - University, Erlangen - Nuremberg
Procedia CIRP | Year: 2016

Identifying a suitable compromise between tight and thus expensive tolerances and wide tolerances that may negatively influence the product quality is a major challenge. This paper focuses on the tolerance-cost-optimization of mechanical assemblies with interrelated dimension chains considering dependencies between the tolerance-cost-relationships. Taking into account interrelated dimension chains the crux is, however, that modifications of a single tolerance can influence several dimension chains as well as the resulting production costs. Based on different existing approaches for the statistical tolerance-cost-optimization, the authors will provide appropriate guidance for the product developer dealing with interrelated dimension chains. © 2016 The Authors. Source

Benneker L.M.,University of Bern | Gisep A.,AO Development Institute | Krebs J.,RH realHealth International AG | Boger A.,Ansbach University of Applied Sciences | And 2 more authors.
Veterinary and Comparative Orthopaedics and Traumatology | Year: 2012

Introduction: Several studies have described 'open' approach techniques for cementation of sheep and goat vertebrae; however, no percutaneous technique has been developed so far for use in non-primates. The aim of this study was to develop an animal model for percutaneous vertebroplasty under clinical conditions. Methods: In a pilot study with dissected cadaveric ovine vertebrae, the technique and instruments as well as the optimal needle position were determined. In an in vivo animal study using 33 lumbar vertebrae of 11 sheep, a percutaneous vertebroplasty was performed under general anaesthesia. Needle position and cement volume were evaluated from high resolution, quantitative computed tomography imaging. Results: The percutaneous technique for ver-tebroplasty was applicable to the vertebral bodies (L1 to L5) of the ovine lumbar spine without any related adverse effects for the animals. The procedure showed a steep learning curve represented by the reduction of the distance between the actual and planned needle positioning (7.2 mm to 3.7 mm; median value) and shorter surgery times (21.3 min to 15.0 min, average) with progression of the study. Conclusion: The described technique is feasible and repeatable under clinical conditions. This is the first percutaneous vertebroplasty technique for non-primates and we conclude that the sheep is a valid animal model to investigate the effects of cement augmentation in vivo. © Schattauer 2012. Source

Kolb J.P.,University of Hamburg | Kueny R.A.,TU Hamburg - Harburg | Puschel K.,University of Hamburg | Boger A.,Ansbach University of Applied Sciences | And 4 more authors.
European Spine Journal | Year: 2013

Purpose: Normal progression of osteoporosis or the rigid reinforcement of the fractured vertebral body with polymethyl methacrylate (PMMA) cement is being discussed as a cause for adjacent-level fractures after vertebroplasty. The purpose of this study was to investigate whether augmentation with low stiffness cement can decrease the risk of adjacent-level fractures in low-quality bone. Methods: Eighteen female osteoporotic lumbar specimens (L1-L5) were harvested and divided into three groups according to bone mineral density: (I) native; (II) PMMA; (III) modified PMMA (lower stiffness). For the PMMA and modified PMMA groups, a compression fracture was first mechanically induced in L3, and then the fracture received vertebroplasty treatment. The cement stiffness reduction of the modified PMMA group was achieved via an addition of 8 mL of serum to the typical PMMA base. All specimens were exposed to cyclic loading (4 Hz) and a stepwise increasing applied peak force. Cement stiffness was tested according to ISO 5833. Results: A 51 % decrease in cement stiffness was achieved in the modified PMMA group (954 ± 141 vs. 1,937 ± 478 MPa, p < 0.001). Fatigue fracture force (the force level during cyclic loading at which the deformation experienced a sudden increase; FFF) was significantly affected by bone quality (r 2 = 0.39, p = 0.006) and by the initial fracture force (the force necessary to create the initial fracture in L3 prior to augmentation; r 2 = 0.82, p < 0.001). Using initial fracture force as a covariate, the FFF of the modified PMMA group (1,764 ± 49 N) was significantly higher than in the PMMA group (1,544 ± 55 N; p = 0.03). Conclusions: A possible method to reduce adjacent-level fractures after vertebroplasty in patients with reduced bone quality could be the use of a lower modulus cement. Therefore, mixing cement with biocompatible fluids could prove useful to tailor cement properties in the operating theater. © 2013 Springer-Verlag Berlin Heidelberg. Source

Kinzl M.,Vienna University of Technology | Boger A.,Ansbach University of Applied Sciences | Zysset P.K.,University of Bern | Pahr D.H.,Vienna University of Technology
Journal of Biomechanics | Year: 2012

Recently published compression tests on PMMA/bone specimens extracted after vertebral bone augmentation indicated that PMMA/bone composites were not reinforced by the trabecular bone at all. In this study, the reasons for this unexpected behavior should be investigated by using non-linear micro-FE models. Six human vertebral bodies were augmented with either standard or low-modulus PMMA cement and scanned with a HR-pQCT system before and after augmentation. Six cylindrical PMMA/bone specimens were extracted from the augmented region, scanned with a micro-CT system and tested in compression. Four different micro-FE models were generated from these images which showed different bone tissue material behavior (with/without damage), interface behavior (perfect bonding, frictionless contact) and PMMA shrinkage due to polymerization. The non-linear stress-strain curves were compared between the different micro-FE models as well as to the compression tests of the PMMA/bone specimens. Micro-FE models with contact between bone and cement were 20% more compliant compared to those with perfect bonding. PMMA shrinkage damaged the trabecular bone already before mechanical loading, which further reduced the initial stiffness by 24%. Progressing bone damage during compression dominated the non-linear part of the stress-strain curves. The micro-FE models including bone damage and PMMA shrinkage were in good agreement with the compression tests. The results were similar with both cements. In conclusion, the PMMA/bone interface properties as well as the initial bone damage due to PMMA polymerization shrinkage clearly affected the stress-strain behavior of the composite and explained why trabecular bone did not contribute to the stiffness and strength of augmented bone. © 2012 Elsevier Ltd. Source

Poepel C.,Ansbach University of Applied Sciences
ACM International Conference Proceeding Series | Year: 2014

This paper presents a method of evaluating computer-based musical instruments. The method is based on a paired comparison of sound files produced by the instruments to be evaluated. The same input signal imparting performers' actions to generate musical expression is applied to different instruments. Each output is recorded and the different recordings are compared by listeners in relation to factors relevant for musical expression. A study using this method is presented. The results show that there are significant differences between the instruments compared and that the evaluation method used allows insight into specific features of the evaluated instruments. The method used in this study can be adapted to compare and evaluate new developments in the field of new interfaces for musical expression providing the same input signal can be used and fed into the instruments. Copyright 2014 ACM. Source

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