Refine
Year of publication
- 2003 (254) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (57)
- Fachbereich Elektrotechnik und Informationstechnik (33)
- Fachbereich Maschinenbau und Mechatronik (31)
- Fachbereich Wirtschaftswissenschaften (31)
- INB - Institut für Nano- und Biotechnologien (30)
- Fachbereich Energietechnik (25)
- IfB - Institut für Bioengineering (24)
- Fachbereich Luft- und Raumfahrttechnik (21)
- Fachbereich Bauingenieurwesen (20)
- Fachbereich Chemie und Biotechnologie (14)
Language
- German (147)
- English (106)
- Portuguese (1)
Document Type
- Article (154)
- Conference Proceeding (40)
- Book (29)
- Part of a Book (11)
- Course Material (7)
- Patent (5)
- Part of a Periodical (3)
- Other (2)
- Doctoral Thesis (1)
- Report (1)
- Working Paper (1)
Keywords
- Blitzschutz (6)
- Lightning protection (6)
- CAD (4)
- Clusterion (4)
- Air purification (3)
- Auslenkung (3)
- Bauingenieurwesen (3)
- Fachhochschule Aachen (3)
- Javasimulation (3)
- Luftreiniger (3)
Innovationsforschung heute : die Mannheimer Innovationspanels / Norbert Janz ; Georg Licht (Hrsg.)
(2003)
Entrauchung über Seitenwände
(2003)
Die Eignung von Baggergut als mineralische Komponente in Deponie-Oberflächenabdichtungssystemen
(2003)
Seßlestalbrücke - Verbundbrücke mit einteiligem Querschnitt / Wanzek, Thorsten; Gossla, Ulrich
(2003)
WS GTaD-2003 - The 1st Workshop on Graph Transformations and Design ed Grabska, E., Seite 6-7, Jagiellonian University Krakow. 2 pages
ITCE-2003 - 4th Joint Symposium on Information Technology in Civil Engineering ed Flood, I., Seite 1-12, ASCE (CD-ROM), Nashville, USA In this paper we discussed graph based tools to support architects during the conceptual design phase. Conceptual Design is defined before constructive design; the used concepts are more abstract. We develop two graph based approaches, a topdown using the graph rewriting system PROGRES and a more industrially oriented approach, where we extend the CAD system ArchiCAD. In both approaches, knowledge can be defined by a knowledge engineer, in the top-down approach in the domain model graph, in the bottom-up approach in the in an XML file. The defined knowledge is used to incrementally check the sketch and to inform the architect about violations of the defined knowledge. Our goal is to discover design error as soon as possible and to support the architect to design buildings with consideration of conceptual knowledge.
Sanierung des ehemaligen Gaswerkgeländes am Bremer Hauptbahnhof / K. Konertz ; E. Biener ; T. Sasse
(2003)
Strategies of miniaturised reference electrodes integrated in a silicon-based „one chip“ pH sensor
(2003)
Härtebegriff im Zusammenhang mit Vernetzung, Bruchdehnung und Dauerfestigkeit eines Elastomers
(2003)
Layer Deposition I
(2003)
Sonderbilanz und Status
(2003)
3D-Freiformflächenmessung
(2003)
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).
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.
Pulse shape discrimination of LSO and LuYAP scintillators for depth of interaction detection in PET
(2003)
A feasible way to gain the depth of interaction information in a PET scanner is the use of phoswich detectors. In general the layer of interaction is identified front the pulse shape of the corresponding scintillator material. In this work pulses from LSO and LuYAP crystals were investigated in order to find a practical method of distinguishing. It turned out that such a pulse processing could he kept simple due to an additional slow component in the light decay of the LuYAP pulse. At the same time the short decay time guarantees that the major amount of the light output is still collected within a short pulse recording time.
Pulse shape discrimination of LSO and LuYAP scintillators for depth of interaction detection in PET
(2003)
A feasible way to gain the depth of interaction information in a positron emission tomography scanner is the use of phoswich detectors. In general, the layer of interaction is identified from the pulse shape of the corresponding scintillator material. In this work, pulses from LSO and LuYAP crystals were investigated in order to find a practical method of distinguishing. It turned out that such a pulse processing could be kept simple because of an additional slow component in the light decay of the LuYAP pulse. At the same time, the short decay time guarantees that the major amount of the light output is still collected within a short pulse recording time.
ComputerMathematik mit Maple
(2003)