TY  - JOUR
A1  - Khodaverdi, M.
A1  - Pauly, F.
A1  - Schroder, G.
A1  - Ziemons, Karl
A1  - Sievering, R.
A1  - Halling, H.
T1  - Preliminary studies of a micro-CT for a combined small animal PET/CT scanner
JF  - 2001 IEEE Nuclear Science Symposium Conference Record, Vol. 3
N2  - We are developing an X-ray computed tomography (CT) system which will be combined with a high resolution animal PET system. This permits acquisition of both molecular and anatomical images in a single machine. In particular the CT will also be utilized for the quantification of the animal PET data by providing accurate data for attenuation correction. A first prototype has been built using a commercially available plane silicon diode detector. A cone-beam reconstruction provides the images using the Feldkamp algorithm. First measurements with this system have been performed on a mouse. It could be shown that the CT setup fulfils all demands for a high quality image of the skeleton of the mouse. It is also suited for soft tissue measurements. To improve contrast and resolution and to acquire the X-ray energy further development of the system, especially the use of semiconductor detectors and iterative reconstruction algorithms are planned.
Y1  - 2002
SN  - 1082-3654
SP  - 1605
EP  - 1606
ER  - 
TY  - JOUR
A1  - Streun, M.
A1  - Brandenburg, G.
A1  - Larue, H.
A1  - Zimmermann, E.
A1  - Ziemons, Karl
A1  - Halling, H.
T1  - A PET system based on data processing of free-running sampled pulses
JF  - 2001 IEEE Nuclear Science Symposium Conference Record, Vol. 2
N2  - Within the developments for the Crystal Clear small animal PET project (CLEARPET) a dual head PET system has been established. The basic principle is the early digitization of the detector pulses by free running ADCs. The determination of the γ-energy and also the coincidence detection is performed by data processing of the sampled pulses on the host computer. Therefore a time mark is attached to each pulse identifying the current cycle of the 40 MHz sampling clock. In order to refine the time resolution the pulse starting time is interpolated from the samples of the pulse rise. The detector heads consist of multichannel PMTs with a single LSO scintillator crystal coupled to each channel. For each PMT only one ADC is required. The position of an event is obtained separately from trigger signals generated for each single channel. An FPGA is utilized for pulse buffering, generation of the time mark and for the data transfer to the host via a fast I/O-interface.
Y1  - 2002
SN  - 1082-3654
SP  - 693
EP  - 694
ER  - 
TY  - JOUR
A1  - Temiz Artmann, Aysegül
A1  - Yalcin, Ozlem
A1  - Resmi, Halil
A1  - Baskurt, Oguz K.
T1  - Can white blood cell activation be one of the major factors that affect hemorheological parameters during and after exercise?
JF  - Clinical Hemorheology and Microcirculation. 26 (2002), H. 3
Y1  - 2002
SN  - 1386-0291
N1  - = The 11th European Symposium on Clinical Hemorheology, Rouen, France, 19-22 September 2000
SP  - 189
EP  - 193
ER  - 
TY  - JOUR
A1  - Fredebeul-Krein, Markus
T1  - Regulating Prices of Unbundled Access to the Local Loop: A German Case Study
JF  - Telekomunikacja i techniki informacyjne (2002)
Y1  - 2002
SN  - 1640-1549
N1  - Telecommunications and Information Technologies
SP  - 10
EP  - 18
ER  - 
TY  - JOUR
A1  - Biselli, Manfred
A1  - Kragl, U.
A1  - Wandrey, C.
T1  - Reaction Engineering for Enzyme-Catalyzed Biotransformations
JF  - Enzyme catalysis in organic synthesis : a comprehensive handbook. Bd. 1. -  2., completely rev. and enl. ed. / ed. by Karlheinz Drauz.
Y1  - 2002
SN  - 3-527-29949-1
N1  - erschienen: Vol. 1-3
SP  - 185
EP  - 257
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Sander, Volker
A1  - Czajkowski, K.
A1  - Foster, I.
A1  - Kesselman, C.
T1  - SNAP: A Protocol for Negotiating Service Level Agreements and Coordinating Resource Management in Distributed Systems / Czajkowski, K. ; Foster, I. ; Kesselman, C. ; Sander, V. ; Tuecke, S.
JF  - Job Scheduling Strategies for Parallel Processing : 8th InternationalWorkshop, JSSPP 2002 Edinburgh, Scotland, UK, July 24, 2002. Revised Papers
Y1  - 2002
SN  - 3-540-00172-7
N1  - Lecture Notes in Computer Science ; 2537 ; JSSPP <8, 2002, Edinburgh >
SP  - 153
EP  - 183
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Havermann, Marc
A1  - Haertig, J.
A1  - Rey, C.
A1  - George, A.
T1  - Particle image velocimetry in mach 3.5 and 4.5 shock-tunnel flows / Haertig, J. ; Havermann, M. ; Rey, C. ; George, A.
JF  - AIAA journal. 40 (2002), H. 6
Y1  - 2002
SN  - 0001-1452
N1  - Printausgabe in der Bereichsbibliothek Eupener Str. Signatur: 23 Z 701
SP  - 1056
EP  - 1060
PB  - -
ER  - 
TY  - JOUR
A1  - Hoffschmidt, Bernhard
A1  - Fend, Thomas
A1  - Jorgensen, Gary
T1  - Comparative assessment of solar concentrator materials / Thomas Fend ; Bernhard Hoffschmidt ; Gary Jorgensen ...
JF  - Renewable energy for local communities of Europe : (toward Rio+10) ; proceedings / EuroSun 2002, the 4th ISES Europe Solar Congress ; Bologna (Italy), 23 - 26 June 2002 / ISES Italia
Y1  - 2002
SN  - 88-900893-0-X
N1  - Eurosun <4, 2002, Bologna> ; International Solar Energy Society
SP  - paper_125.pdf
CY  - Bologna
ER  - 
TY  - JOUR
A1  - Naujokat, Anke
T1  - Aachen: Colourdome
JF  - Bauwelt. 93 (2002), H. 37
Y1  - 2002
SN  - 0931-6590
SP  - 2
ER  - 
TY  - JOUR
A1  - Havermann, Marc
A1  - Seiler, F.
A1  - George, A.
A1  - Leopold, F.
T1  - Enhanced Doppler Picture Velocimetry (DPV) for Planar Velocity Measurements in High-Speed Shock Tunnel Flow / Seiler, F. ; George, A. ; Leopold, F. ; Havermann, M. ; Srulijes, J.
JF  - 10th International Symposium on Flow Visualization : Kyōto, Japan, August 26 - 29, 2002 / sponsored by International Flow Visualization Society . [Chairman:] Toshio Kobayashi
Y1  - 2002
SN  - 4906497829
N1  - International Symposium on Flow Visualization ; (10 ; 2002.08.26-29 ; Kyōto)
PB  - Visualization Society of Japan
CY  - Kyoto
ER  -