Refine
Year of publication
- 2006 (330) (remove)
Document Type
- Article (180)
- Conference Proceeding (94)
- Book (29)
- Patent (6)
- Part of a Book (5)
- Diploma Thesis (3)
- Lecture (3)
- Other (3)
- Course Material (2)
- Report (2)
- Master's Thesis (1)
- Part of Periodical (1)
- Working Paper (1)
Language
- German (166)
- English (160)
- Russian (2)
- Portuguese (1)
- Spanish (1)
Keywords
- Biosensor (23)
- CAD (3)
- Technische Mechanik (3)
- Bauingenieurwesen (2)
- Bauplanung (2)
- Führung (2)
- Leadership (2)
- Motivation (2)
- Rapid Prototyping (2)
- Rapid prototyping (2)
- Self-Leadership (2)
- biosensor (2)
- civil engineering (2)
- 3-nitrofluoranthene (1)
- 3D (1)
- ACCESS 2003 (1)
- ACCESS <Programm> (1)
- Aachen / Fachhochschule Aachen (1)
- Aachen / Fachhochschule Aachen / Fachbereich Bauingenieurwesen (1)
- Aachen University of Applied Sciences (1)
Institute
- Fachbereich Medizintechnik und Technomathematik (75)
- Fachbereich Bauingenieurwesen (51)
- Fachbereich Wirtschaftswissenschaften (45)
- Fachbereich Luft- und Raumfahrttechnik (32)
- Fachbereich Energietechnik (29)
- Fachbereich Maschinenbau und Mechatronik (29)
- Fachbereich Elektrotechnik und Informationstechnik (27)
- IfB - Institut für Bioengineering (24)
- INB - Institut für Nano- und Biotechnologien (22)
- Fachbereich Chemie und Biotechnologie (17)
- Fachbereich Architektur (6)
- Solar-Institut Jülich (6)
- Fachbereich Gestaltung (4)
- Freshman Institute (3)
- Nowum-Energy (3)
- ZHQ - Bereich Hochschuldidaktik und Evaluation (3)
- ECSM European Center for Sustainable Mobility (2)
- FH Aachen (1)
- IBB - Institut für Baustoffe und Baukonstruktionen (1)
- Sonstiges (1)
Development of an optimized LSO/LuYAP phoswich detector head for the Lausanne ClearPET demonstrator
(2006)
This paper describes the LSO/LuYAP phoswich detector head developed for the ClearPET small animal PET scanner demonstrator that is under construction in Lausanne within the Crystal Clear Collaboration. The detector head consists of a dual layer of 8×8 LSO and LuYAP crystal arrays coupled to a multi-anode photomultiplier tube (Hamamatsu R7600-M64). Equalistion of the LSO/LuYAP light collection is obtained through partial attenuation of the LSO scintillation light using a thin aluminum deposit of 20-35 nm on LSO and appropriate temperature regulation of the phoswich head between 30°C to 60°C. At 511keV, typical FWHM energy resolutions of the pixels of a phoswich head amounts to (28±2)% for LSO and (25±2)% for LuYAP. The LSO versus LuYAP crystal identification efficiency is better than 98%. Six detector modules have been mounted on a rotating gantry. Axial and tangential spatial resolutions were measured up to 4 cm from the scanner axis and compared to Monte Carlo simulations using GATE. FWHM spatial resolution ranges from 1.3 mm on axis to 2.6 mm at 4 cm from the axis.
Quartz crystal nanobalance (QCN) sensors are considered as powerful masssensitive sensors to determine materials in the sub-nanogram level. In this study, a single piezoelectric quartz crystal nanobalance modified with polystyrene was employed to detect benzene, toluene, ethylbenzene and xylene (BTEX compounds). The frequency shift of the QCN sensor was found to be linear against the BTEX compound concentrations in the range about 1-45 mg l-1. The correlation coefficients for benzene, toluene, ethylbenzene, and xylene were 0.991, 0.9977, 0.9946 and 0.9971, respectively. The principal component analysis was also utilized to process the frequency response data of the single piezoelectric crystal at different times, considering to the different adsorption-desorption dynamics of BTEX compounds. Using principal component analysis, it was found that over 90% of the data variance could still be explained by use of two principal components (PC1 and PC2). Subsequently, the successful identification of benzene and toluene was possible through the principal component analysis of the transient responses of the polystyrene modified QCN sensor. The results showed that the polystyrene-modified QCN had favorable identification and quantification performances for the BTEX compounds.