TY  - JOUR
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - Maximally edge-connected digraphs
JF  - Australasian journal of combinatorics
Y1  - 2003
SN  - 1034-4942 (E-Journal); 1034-4942 (Print)
VL  - Vol. 27
SP  - 23
EP  - 32
ER  - 
TY  - JOUR
A1  - Hekmat, Khosro
A1  - Kanani, Reza
A1  - Lauterbach, Gerhard
A1  - Südkamp, Michael
A1  - Ahmadpoor, Tooraj
A1  - Weber, Hans-Joachim
A1  - Mehlhorn, Uwe
T1  - Moderne Herzschrittmachersysteme wenig störanfällig durch Mobilfunktelefone
JF  - Deutsches Ärzteblatt. 100 (2003), H. 38
Y1  - 2003
SP  - A2438
EP  - A2445
ER  - 
TY  - JOUR
A1  - Heinrichs, U.
A1  - Pietrzyk, U.
A1  - Ziemons, Karl
T1  - Design optimization of the PMT-ClearPET prototypes based on simulation studies with GEANT3
JF  - 2002 IEEE Nuclear Science Symposium Conference Record, Vol. 3
N2  - Within the Crystal Clear Collaboration four centres are developing 2nd generation high performance small animal PET scanners for different kinds of animals and medical applications. The first prototypes are PMT-based systems including depth of interaction (DOI) detection by using a phoswich layer of LSO and LuYAP. The aim of these simulation studies is to optimize sensitivity and spatial resolution of given designs, which vary in FOVs caused by different detector configurations (ring/octagon) and sizes. For this purpose the simulation tool GEANT3 (CERN) was used. The simulations have shown that all PMT designs with one-to-one coupling of crystals have a very nonlinear axial sensitivity profile. By shifting every other PMT 1/4 of a PMT length in axial direction the sampling of the FOVs became more homogeneous. At an energy threshold of 350keV the regression coefficient increases from 0.818 for the non-shifted to 0.993 for the shifted design. Simulations of a point source centred in the FOV (threshold: 350keV) resulted in sensitivities of 4.2% for a 4×20PMT (LSO/LuYAP a 10mm) and 3.8% for a 4×16PMT (LSO/LuYAP a 8mm) ring design. The 3D-MLEM reconstruction of a point source shows the enormous improvement of resolution using a crystal double layer with DOI (3.1mm at 40mm from CFOV) instead of a 20mm single layer (11.9mm).
Y1  - 2003
SN  - 1082-3654
SP  - 682
EP  - 686
ER  - 
TY  - JOUR
A1  - Heinrichs, U.
A1  - Pietrzyk, U.
A1  - Ziemons, Karl
T1  - Design optimization of the PMT-ClearPET prototypes based on simulation studies with GEANT3
JF  - IEEE Transactions on Nuclear Science
N2  - Within the Crystal Clear Collaboration (CCC), four centers are developing second generation high performance small animal positron emission tomography (PET) scanners for different kinds of animals and medical applications. The first prototypes are photomultiplier tube (PMT)-based systems including depth of interaction (DOI) detection by using a phoswich layer of lutetium oxyorthosilicate (LSO) and lutetium yttrium aluminum perovskite (LuYAP). The aim of these simulation studies is to optimize sensitivity and spatial resolution of given designs, which vary in fields of view (FOVs) caused by different detector configurations (ring/octagon) and sizes. For this purpose the simulation tool GEANT3 (CERN, Geneva, Switzerland) was used.
Y1  - 2003
SN  - 0018-9499
VL  - 50
IS  - 5
SP  - 1428
EP  - 1432
ER  - 
TY  - JOUR
A1  - Heger, Michael
A1  - Callhoff, Aneta
T1  - Die Fachhochschulen in Nordrhein-Westfalen intensivieren die Hochschuldidaktik noch weiter: Netzwerk HDW-NRW-FH in neuer Phase
JF  - Hochschulwesen, HSW. 51 (2003), H. 3
Y1  - 2003
SN  - 0018-2974
SP  - 123
ER  - 
TY  - JOUR
A1  - Heger, Michael
A1  - Callhoff, Aneta
T1  - Hochschuldidaktische Weiterbildung der Fachhochschulen in Nordrhein-Westfalen
JF  - Hochschuldidaktik in Deutschland / [Red.: Johannes Wildt. Hrsg. von der Arbeitsgemeinschaft für Hochschuldidaktik e.V.]
Y1  - 2003
N1  - DUZ special
SP  - 5
PB  - Raabe
CY  - Bonn
ER  - 
TY  - JOUR
A1  - Havermann, Marc
A1  - Seiler, F.
A1  - George, A.
A1  - Leopold, F.
T1  - Planar Velocity Visualization in High-Speed Wedge Flow using Doppler Picture Velocimetry (DPV) compared with Particle Image Velocimetry (PIV) / Seiler, F. ; Havermann, M. ; George, A. ; Leopold, F. ; Srulijes, J.
JF  - Journal of Visualization. 6 (2003), H. 3
Y1  - 2003
SN  - 1343-8875
SP  - 253
EP  - 262
PB  - -
ER  - 
TY  - BOOK
A1  - Havermann, Marc
T1  - PIV-Messungen im hohen Überschall am ISL-Stoßrohr-Windkanal : 11. Fachtagung Lasermethoden in der Strömungsmesstechnik, PTB Braunschweig, 9. - 11. September 2003 / Institut Franco-Allemand de Recherches de Saint-Louis. Havermann, M. ...
Y1  - 2003
N1  - Publication / Institut Franco-Allemand de Recherches de Saint-Louis ; 655
PB  - ISL
CY  - Saint-Louis
ER  - 
TY  - JOUR
A1  - Hartung, Frank
T1  - Mobile DRM Introduction: The Need for Mobile DRM
JF  - Digital Rights Management : Technological, Economic, Legal and Political Aspects / Becker, Eberhard [u.a.]
Y1  - 2003
N1  - Lecture Notes in Computer Science ; 2770
SP  - 138
EP  - 149
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Hagemann, Hans-Jürgen
T1  - INGMEDIA - Lernsoftware für technische und physikalische Praktika in Ingenieurstudiengängen
JF  - E-Learning : Tagungsband ; NMB-Projekte in den Ingenieurwissenschaften ; Workshop der ingenieurwissenschaftlichen Projekte im bmb+f-Förderprogramm "Neue Medien in der Bildung" am 25. und 26. Juni 2003 an der Hochschule Anhalt in Dessau / Hrsg.: Stephan Pi
Y1  - 2003
N1  - Workshop E-Learning: NMB-Projekte in den Ingenieurwissenschaften <2003, Dessau>
SP  - 64
EP  - 69
PB  - Hochschule Anhalt
CY  - Dessau
ER  -