TY  - CHAP
A1  - Ballmann, Josef
A1  - Boucke, Alexander
A1  - Braun, Carsten
T1  - Aeroelastic sensitivity in the transonic regime
T2  - Symposium Transsonicum IV : proceedings of the IUTAM symposium held in Göttingen, Germany, 2 - 6 September 2002 / ed. by Helmut Sobieczky. Fluid mechanics and its applications.  Vol. 73
Y1  - 2003
SN  - 978-94-010-3998-7
SP  - 225
EP  - 236
PB  - Kluwer Academic
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Baroud, G.
A1  - Wu, J.Z.
A1  - Bohner, M
A1  - Sponagel, Stefan
A1  - Steffen, T.
T1  - How to determine the permeability for cement infiltration into osteoporotic cancellous bone
JF  - Medical Engineering & Physics. 25 (2003), H. 4
N2  - Cement augmentation is an emerging surgical procedure in which bone cement is used to infiltrate and reinforce osteoporotic vertebrae. Although this infiltration procedure has been widely applied, it is performed empirically and little is known about the flow characteristics of cement during the injection process. We present a theoretical and experimental approach to investigate the intertrabecular bone permeability during the infiltration procedure. The cement permeability was considered to be dependent on time, bone porosity, and cement viscosity in our analysis. In order to determine the time-dependent permeability, ten cancellous bone cores were harvested from osteoporotic vertebrae, infiltrated with acrylic cement at a constant flow rate, and the pressure drop across the cores during the infiltration was measured. The viscosity dependence of the permeability was determined based on published experimental data. The theoretical model for the permeability as a function of bone porosity and time was then fit to the testing data. Our findings suggest that the intertrabecular bone permeability depends strongly on time. For instance, the initial permeability (60.89 mm4/N.s) reduced to approximately 63% of its original value within 18 seconds. This study is the first to analyze cement flow through osteoporotic bone. The theoretical and experimental models provided in this paper are generic. Thus, they can be used to systematically study and optimize the infiltration process for clinical practice.
KW  - Osteoporose
KW  - Permeabilität
KW  - Viskose Strömung
KW  - Viskosität
KW  - Vertebroplastie
KW  - Cement infiltration
KW  - Vertebroplasty
KW  - Osteoporosis
KW  - Permeability
KW  - Experiment
KW  - Analysis
KW  - Viscous flow
Y1  - 2003
SN  - 1350-4533
SP  - 283
EP  - 288
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Bethke, H.
A1  - Sasse, T.
A1  - Wernhoff, T.
T1  - Alternative landfill capping using locally available recycled material
JF  - Land contamination & reclamation. 14 (2003), H. 4
Y1  - 2003
SN  - 0967-0513
SP  - 419
EP  - 427
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
A1  - Wernhoff, T.
T1  - Using harbour dredged material for combination sealing of the former Bockhorner Weg disposal site in Bremen, Germany
JF  - Proceedings of the International Harbour Congress. 13 (2003)
Y1  - 2003
N1  - International Harbour Congress <13, 2003, Antwerpen>
SP  - 101
EP  - 109
ER  - 
TY  - JOUR
A1  - Bohn, Dieter
A1  - Funke, Harald
T1  - Experimental investigations into the nonuniform flow in a 4-stage turbine with special focus on the flow equalization in the first turbine stage
JF  - ASME TURBO EXPO, Proceedings of the ASME Turbo Expo, 2003
Y1  - 2003
SN  - 0-7918-3689-4
N1  - ASME TURBO EXPO 2003, Proceedings, Vol. 6: Turbomachinery, Pt. A, Atlanta, US, Jun 16-19, 2003
SP  - 281
EP  - 289
ER  - 
TY  - JOUR
A1  - Bressel, A.
A1  - Schultze, J.W.
A1  - Khan, W.
A1  - Wolfaardt, G. M.
A1  - Rohns, H.-P.
A1  - Irmscher, R.
A1  - Schöning, Michael Josef
T1  - High resolution gravimetric, optical and electrochemical investigations of microbial biofilm formation in aqueous systems
JF  - Electrochimica Acta. 48 (2003), H. 20-22
Y1  - 2003
SN  - 0013-4686
SP  - 3363
EP  - 3372
ER  - 
TY  - CHAP
A1  - Britten, G.
A1  - Braun, Carsten
A1  - Hesse, M.
A1  - Ballmann, Josef
T1  - Computational aeroelasticity with reduced structural models
T2  - Flow modulation and fluid-structure interaction at airplane wings : research results of the Collaborative Research Center SFB 401 at RWTH Aachen, University of Technology, Aachen, Germany / Josef Ballmann (Ed.) Notes on numerical fluid mechanics and multidisciplinary design. Vol. 84
Y1  - 2003
SN  - 3-540-40209-8
SP  - 275
EP  - 299
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
A1  - Kuhlmann, Winfried
A1  - Lopez, M.
A1  - Fernandez, S.
T1  - Seismic vulnerability assessment of the Aachen Cathedral based on measurements and numerical simulations
T2  - International Conference on Earthquake Engineering to mark 40 years from Catastrophic 1963 Skopje Earthquake, Skopje 2003
Y1  - 2003
SP  - 1
EP  - 8
ER  - 
TY  - CHAP
A1  - Chudoba, Rostislav
A1  - Butenweg, Christoph
A1  - Pfeiffer, Frank
T1  - Textile reinforced concrete. Part I: Process model for collaborative research and development
T2  - Digital proceedings / IKM 2003, proceedings 16th International Conference on the Applications of Computer Science and Mathematics in Architecture and Civil Engineering [Elektronische Ressource : 10. - 12. Juni 2003, Weimar] / Bauhaus-Universität Weimar. Ed.: K. Gürlebeck; L. Hempel; C. Könke
Y1  - 2003
SP  - 1
EP  - 8
PB  - IKM
CY  - Weimar
ER  - 
TY  - JOUR
A1  - Claessens, J.
A1  - Fuchsberger, A.
A1  - Günther, C.
A1  - Horn, G.
A1  - Howker, K.
A1  - Hulsebosch, R.J.
A1  - Mitchell, C.
A1  - Paterson, K.
A1  - Preneel, B.
A1  - Schellekens, D.
A1  - Schuba, Marko
T1  - Pioneering Advanced Mobile Privacy and Security
Y1  - 2003
N1  - electronic proceedings of the 18th IFIP International Information Security Conference, Athens, Greece, May 2003
SP  - 1
EP  - 17
ER  -