TY  - JOUR
A1  - Streun, M.
A1  - Brandenburg, G.
A1  - Larue, H.
A1  - Zimmermann, E.
A1  - Ziemons, Karl
A1  - Halling, H.
T1  - Coincidence detection by digital processing of free-running sampled pulses
JF  - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
N2  - Coincident events in two scintillator crystals coupled to photomultipliers (PMT) are detected by processing just the digital data of the recorded pulses. For this purpose the signals from both PMTs are continuously sampled by free-running ADCs at a sampling rate of 40 MHz. For each sampled pulse the starting time is determined by processing the pulse data. Even a fairly simple interpolating algorithm results in a FWHM of about 2 ns.
Y1  - 2002
SN  - 0168-9002
VL  - 487
IS  - 3
SP  - 530
EP  - 534
ER  - 
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  - BOOK
A1  - Sander, Volker
A1  - Roy, Alain
T1  - Advance Reservation API / Roy, Alain ; Sander, Volker
Y1  - 2002
N1  - GFD-E.5 Scheduling Working Group Category: Experimental
PB  - Global Grid Forum
ER  - 
TY  - BOOK
A1  - Havermann, Marc
A1  - Ende, Herrybert
A1  - Schwenzer, Michael
T1  - Shock tunnel study on the interaction of a lateral jet with a supersonic cross flow : West East High-Speed Flow Field Conference, Marseille, France, April 22 - 26, 2002; axe de recherches 2.14 / Havermann, M.; Ende, H.; Schwenzer, M. Institut Franco-Allemand de Recherches de Saint-Louis
Y1  - 2002
N1  - Publication / Institut Franco-Allemand de Recherches de Saint-Louis ; 620
PB  - ISL
CY  - Saint-Louis
ER  - 
TY  - BOOK
A1  - Havermann, Marc
A1  - Haertig, J.
A1  - Rey, C.
A1  - George, A.
T1  - Application of particle image velocimetry to high-speed supersonic flows in a shock tunnel : 11th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, July 8 - 11, 2002; Schwerpunkt 0 / Institut Franco-Allemand de Recherches de Saint-Louis. Havermann, M. ...
Y1  - 2002
N1  - Publication / Institut Franco-Allemand de Recherches de Saint-Louis ; 640
PB  - ISL
CY  - Saint-Louis
ER  -