@book{Laack2002, author = {Laack, Walter van}, title = {A better history of our world / Vol. 2. Life}, publisher = {van Laack}, address = {Aachen}, isbn = {978-3-8311-2597-5}, pages = {236 S.}, year = {2002}, language = {en} } @article{GoettscheGabryschDelahayeetal.2002, author = {G{\"o}ttsche, Joachim and Gabrysch, K. and Delahaye, A. and Schwarzer, Klemens}, title = {Solar-Campus Juelich - Energy performance and indoor climate}, series = {AIVC 23rd conference - EPIC 2002 AIVC (in conjunction with 3rd European Conference on Energy Performance and Indoor Climate in Buildings) - 23-26 October 2002 - Lyon - France - vol 2}, journal = {AIVC 23rd conference - EPIC 2002 AIVC (in conjunction with 3rd European Conference on Energy Performance and Indoor Climate in Buildings) - 23-26 October 2002 - Lyon - France - vol 2}, pages = {381 -- 386}, year = {2002}, language = {en} } @article{FerreinDyllaLakemeyer2002, author = {Ferrein, Alexander and Dylla, Frank and Lakemeyer, Gerhard}, title = {Acting and Deliberating using Golog in Robotic Soccer - A Hybrid Architecture / Dylla, Frank ; Ferrein, Alexander ; Lakemeyer, Gerhard}, series = {Proc. 3rd International Cognitive Robotics Workshop (CogRob 2002)}, journal = {Proc. 3rd International Cognitive Robotics Workshop (CogRob 2002)}, pages = {1 -- 7}, year = {2002}, language = {en} } @article{OehlschlaegerMichelOsenetal.2002, author = {{\"O}hlschl{\"a}ger, Peter and Michel, Nico and Osen, Wolfram and Freyschmidt, Eva-Jasmin}, title = {T cell response to human papillomavirus 16 E7 in mice: comparison of Cr release assay, intracellular IFN-gamma production, ELISPOT and tetramer staining / Michel, Nico ; {\"O}hlschl{\"a}ger, Peter ; Osen, Wolfram ; Freyschmidt, Eva-Jasmin ; Gut{\"o}hrlein, Heidrun ;}, series = {Intervirology. 45 (2002)}, journal = {Intervirology. 45 (2002)}, isbn = {1423-0100}, pages = {290 -- 299}, year = {2002}, language = {en} } @book{HavermannEndeSchwenzer2002, author = {Havermann, Marc and Ende, Herrybert and Schwenzer, Michael}, title = {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}, publisher = {ISL}, address = {Saint-Louis}, pages = {8 S. : Ill., graph. Darst.}, year = {2002}, language = {en} } @book{HavermannHaertigReyetal.2002, author = {Havermann, Marc and Haertig, J. and Rey, C. and George, A.}, title = {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. ...}, publisher = {ISL}, address = {Saint-Louis}, pages = {10 S. : Ill., graph. Darst.}, year = {2002}, language = {en} } @article{HavermannHaertigReyetal.2002, author = {Havermann, Marc and Haertig, J. and Rey, C. and George, A.}, title = {Particle image velocimetry in mach 3.5 and 4.5 shock-tunnel flows / Haertig, J. ; Havermann, M. ; Rey, C. ; George, A.}, series = {AIAA journal. 40 (2002), H. 6}, journal = {AIAA journal. 40 (2002), H. 6}, publisher = {-}, isbn = {0001-1452}, pages = {1056 -- 1060}, year = {2002}, language = {en} } @article{HavermannSeilerGeorgesetal.2002, author = {Havermann, Marc and Seiler, F. and Georges, A. and Leopold, F.}, title = {Das Dopplerbildverfahren (DPV) des ISL zur Messung der Str{\"o}mungsgeschwindigkeit in einer Ebene / Seiler, F. ; Georges, A. ; Leopold, F. ; Srulijes, J. ; Havermann, M.}, series = {Lasermethoden in der Str{\"o}mungsmesstechnik, 10. Fachtagung, Deutsche Gesellschaft f{\"u}r Laser-Anemometrie GALA, Rostock, DE, 10.-12. Sep, 2002}, journal = {Lasermethoden in der Str{\"o}mungsmesstechnik, 10. Fachtagung, Deutsche Gesellschaft f{\"u}r Laser-Anemometrie GALA, Rostock, DE, 10.-12. Sep, 2002}, publisher = {Univ.}, address = {Rostock}, isbn = {3-86009-233-2}, pages = {11.1 -- 11.6}, year = {2002}, language = {de} } @article{HueningEifertLuekenetal.2002, author = {H{\"u}ning, Felix and Eifert, T. and Lueken, H. and Schmidt, P.}, title = {High-temperature series expansion of the magnetic susceptibility of extended magnetic systems in a complete computer implementation / Eifert, T. ; H{\"u}ning, F. ; Lueken, H. ; Schmidt, P. ; Thiele, G.}, series = {Chemical Physics Letters. 364 (2002), H. 1-2}, journal = {Chemical Physics Letters. 364 (2002), H. 1-2}, publisher = {-}, isbn = {0009-2614}, pages = {69 -- 74}, year = {2002}, language = {en} } @article{HavermannSeilerGeorgeetal.2002, author = {Havermann, Marc and Seiler, F. and George, A. and Leopold, F.}, title = {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.}, series = {10th International Symposium on Flow Visualization : Kyōto, Japan, August 26 - 29, 2002 / sponsored by International Flow Visualization Society . [Chairman:] Toshio Kobayashi}, journal = {10th International Symposium on Flow Visualization : Kyōto, Japan, August 26 - 29, 2002 / sponsored by International Flow Visualization Society . [Chairman:] Toshio Kobayashi}, publisher = {Visualization Society of Japan}, address = {Kyoto}, isbn = {4906497829}, year = {2002}, language = {en} } @book{Wolf2002, author = {Wolf, Martin}, title = {Entwicklung und Evaluation eines Groupware-Systems zur Unterst{\"u}tzung verfahrenstechnischer Entwicklungsprozesse}, publisher = {Shaker}, address = {Aachen}, isbn = {3-8322-0629-9}, pages = {X, 250 S. : graph. Darst.}, year = {2002}, language = {de} } @article{WolfFoltzSchlicketal.2002, author = {Wolf, Martin and Foltz, Christian and Schlick, Christopher and Luczak, Holger}, title = {Development and evaluation of a groupware system to support chemical design processes / Wolf, Martin ; Foltz, Christian ; Schlick, Christopher ; Luczak, Holger}, series = {International Journal of Human-Computer Interaction . 14 (2002), H. 2}, journal = {International Journal of Human-Computer Interaction . 14 (2002), H. 2}, publisher = {-}, isbn = {1044-7318}, pages = {181 -- 198}, year = {2002}, language = {en} } @article{Pfeiffer2002, author = {Pfeiffer, Johann}, title = {Gute Chancen im Maschinenbau}, series = {Aachener Nachrichten / Aachener Zeitung : Sonderbeil. (2002)}, journal = {Aachener Nachrichten / Aachener Zeitung : Sonderbeil. (2002)}, publisher = {-}, year = {2002}, language = {de} } @article{Pfeiffer2002, author = {Pfeiffer, Johann}, title = {Gute Chancen im Maschinenbau}, series = {Rheinische Post : Sonderbeil. (2002)}, journal = {Rheinische Post : Sonderbeil. (2002)}, year = {2002}, language = {de} } @article{Pfeiffer2002, author = {Pfeiffer, Johann}, title = {Chancen im Maschinenbau}, series = {Fachblatt : Journal der Fachhochschule Aachen . 2002 (2002), H. 1}, journal = {Fachblatt : Journal der Fachhochschule Aachen . 2002 (2002), H. 1}, publisher = {-}, pages = {2}, year = {2002}, language = {de} } @article{HeinrichBlumBussmannetal.2002, author = {Heinrich, U. and Blum, A. and Bussmann, N. and Engels, R. and Kemmerling, G. and Weber, S. and Ziemons, Karl}, title = {Statistical studies on the light output and energy resolution of small LSO single crystals with different surface treatments combined with various reflector materials}, series = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, volume = {486}, journal = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, number = {1-2}, issn = {0168-9002}, pages = {60 -- 66}, year = {2002}, abstract = {The optimization of light output and energy resolution of scintillators is of special interest for the development of high resolution and high sensitivity PET. The aim of this work is to obtain statistically reliable results concerning optimal surface treatment of scintillation crystals and the selection of reflector material. For this purpose, raw, mechanically polished and etched LSO crystals (size 2×2×10 mm3) were combined with various reflector materials (Teflon tape, Teflon matrix, BaSO4) and exposed to a 22Na source. In order to ensure the statistical reliability of the results, groups of 10 LSO crystals each were measured for all combinations of surface treatment and reflector material. Using no reflector material the light output increased up to 551±35\% by mechanical polishing the surface compared to 100±5\% for raw crystals. Etching the surface increased the light output to 441±29\%. The untreated crystals had an energy resolution of 24.6±4.0\%. By mechanical polishing the surface it was possible to achieve an energy resolution of 13.2±0.8\%, by etching of 14.8±0.7\%. In combination with BaSO4 as reflector material the maximum increase of light output has been established to 932±57\% for mechanically polished and 895±61\% for etched crystals. The combination with BaSO4 also caused the best improvement of the energy resolution up to 11.6±0.2\% for mechanically polished and 12.2±0.3\% for etched crystals. Relating to the light output there was no significant statistical difference between the two surface treatments in combination with BaSO4. In contrast to this, the statistical results of the energy resolution have shown the combination of mechanical polishing and BaSO4 as the optimum.}, language = {en} } @article{StreunBrandenburgLarueetal.2002, author = {Streun, M. and Brandenburg, G. and Larue, H. and Zimmermann, E. and Ziemons, Karl and Halling, H.}, title = {A PET system with free running ADCs}, series = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, volume = {486}, journal = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, number = {1-2}, issn = {0168-9002}, pages = {18 -- 21}, year = {2002}, abstract = {A small PET system has been built up with two multichannel photomultipliers, which are attached to a matrix of 64 single LSO crystals each. The signal from each multiplier is being sampled continuously by a 12 bit ADC at a sampling frequency of 40 MHz. In case of a scintillation pulse a subsequent FPGA sends the corresponding set of samples together with the channel information and a time mark to the host computer. The data transfer is performed with a rate of 20 MB/s. On the host all necessary information is extracted from the data. The pulse energy is determined, coincident events are detected and multiple hits within one matrix can be identified. In order to achieve a narrow time window the pulse starting time is refined further than the resolution of the time mark (=25 ns) would allow. This is possible by interpolating between the pulse samples. First data obtained from this system will be presented. The system is part of developments for a much larger system and has been created to study the feasibility and performance of the technique and the hardware architecture.}, language = {en} } @article{StreunBrandenburgLarueetal.2002, author = {Streun, M. and Brandenburg, G. and Larue, H. and Zimmermann, E. and Ziemons, Karl and Halling, H.}, title = {Coincidence detection by digital processing of free-running sampled pulses}, series = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, volume = {487}, journal = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, number = {3}, isbn = {0168-9002}, pages = {530 -- 534}, year = {2002}, abstract = {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.}, language = {en} } @article{KhodaverdiPaulySchroderetal.2002, author = {Khodaverdi, M. and Pauly, F. and Schroder, G. and Ziemons, Karl and Sievering, R. and Halling, H.}, title = {Preliminary studies of a micro-CT for a combined small animal PET/CT scanner}, series = {2001 IEEE Nuclear Science Symposium Conference Record, Vol. 3}, journal = {2001 IEEE Nuclear Science Symposium Conference Record, Vol. 3}, issn = {1082-3654}, pages = {1605 -- 1606}, year = {2002}, abstract = {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.}, language = {en} } @article{StreunBrandenburgLarueetal.2002, author = {Streun, M. and Brandenburg, G. and Larue, H. and Zimmermann, E. and Ziemons, Karl and Halling, H.}, title = {A PET system based on data processing of free-running sampled pulses}, series = {2001 IEEE Nuclear Science Symposium Conference Record, Vol. 2}, journal = {2001 IEEE Nuclear Science Symposium Conference Record, Vol. 2}, issn = {1082-3654}, pages = {693 -- 694}, year = {2002}, abstract = {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.}, language = {en} }