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Sanierung des ehemaligen Gaswerkgeländes am Bremer Hauptbahnhof / K. Konertz ; E. Biener ; T. Sasse
(2003)
Seßlestalbrücke - Verbundbrücke mit einteiligem Querschnitt / Wanzek, Thorsten; Gossla, Ulrich
(2003)
Die Eignung von Baggergut als mineralische Komponente in Deponie-Oberflächenabdichtungssystemen
(2003)
Entrauchung über Seitenwände
(2003)
Couponing
(2003)
Rechtsfolgen vorbehaltloser Mietzahlung in Mangelkenntnis –Mehr als bloß eine Etappe beim BGH?
(2003)
Urkundenprozeß ohne Urkunden? Zur Zulässigkeit des Urkundenprozesses bei unstreitigem Vorbringen
(2003)
Anmerkung zu EuGH RS C-208/00 (Niederlassungsfreiheit und Internationales Gesellschaftsrecht)
(2003)
Mobile CRM-Systeme : Customer Relationship Management zur Unterstützung des Vertriebsaußendienstes
(2003)
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.
The Virtual Clean Room - a new tool in teaching MST process technologies University education in high-technology fields like MST is not complete without intensive laboratory sessions. Students cannot fully grasp the complexity and the special problems related to the manufacturing of microsystems without a thorough hands-on experience in a MST clean room.