TY - JOUR A1 - Schöning, Michael Josef A1 - Simonis, Anette A1 - Ruge, Christian A1 - Ecken, Holger A1 - Müller-Veggian, Mattea A1 - Lüth, Hans T1 - A (bio-)chemical Field-effect Sensor with Macroporous Si as Substrate Material and a SiO₂ / LPCVD-Si₃N₄ Double Layer as pH Transducer JF - Sensors. 2 (2002), H. 1 N2 - Macroporous silicon has been etched from n-type Si, using a vertical etching cell where no rear side contact on the silicon wafer is necessary. The resulting macropores have been characterised by means of Scanning Electron Microscopy (SEM). After etching, SiO₂ was thermally grown on the top of the porous silicon as an insulating layer and Si₃N₄ was deposited by means of Low Pressure Chemical Vapour Deposition (LPCVD) as transducer material to fabricate a capacitive pH sensor. In order to prepare porous biosensors, the enzyme penicillinase has been additionally immobilised inside the porous structure. Electrochemical measurements of the pH sensor and the biosensor with an Electrolyte/Insulator/Semiconductor (EIS) structure have been performed in the Capacitance/Voltage (C/V) and Constant capacitance (ConCap) mode. Y1 - 2002 SN - 1424-8220 U6 - http://dx.doi.org/10.3390/s20100011 SP - 11 EP - 22 ER - TY - BOOK A1 - Laack, Walter van T1 - A better history of our world / Vol. 2. Life Y1 - 2002 SN - 978-3-8311-2597-5 N1 - [Eine bessere Geschichte unserer Welt ] PB - van Laack CY - Aachen ER - TY - JOUR A1 - Schöning, Michael Josef A1 - Krause, R. A1 - Block, K. A1 - Musameh, M. A1 - Mulchandani, A. A1 - Wang, J. T1 - A dual amperometric / potentiometric FIA-based biosensor for the distinctive detection of organophosphorus pesticides JF - Book of abstracts / ed. by J. Saneistr. Y1 - 2002 SN - 80-01-02576-4 N1 - Eurosensors ; (16, 2002, Praha) SP - 76 EP - 79 PB - Czech Technical University, Faculty of Electrical Engineering, Department of Measurement CY - Prague ER - TY - JOUR A1 - Schöning, Michael Josef A1 - Kloock, Joachim P. A1 - Mourzina, Y. A1 - Schubert, J. T1 - A first step towards a microfabricated thin-film sensor array on the basis of chalcogenide glass materials JF - Sensors. 2 (2002), H. 9 Y1 - 2002 SN - 1424-8220 SP - 356 EP - 365 ER - TY - CHAP A1 - Gligorevic, Snjezana A1 - Sorger, Ulrich T1 - A new approach to tracking time-variant channels T2 - Proceedings / 5th International Symposium on Wireless Personal Multimedia Communications : WPMC : October 27 - 30, 2002, Honolulu, Hawaii ; vol. 3 Y1 - 2002 SN - 0-7803-7442-8 SN - 1347-6890 SP - 1342 EP - 1345 ER - TY - JOUR A1 - Artmann, Gerhard A1 - Trzewik, Jürgen A1 - Ates, M. T1 - A novel method to quantify mechanical tension in cell monolayers. Trzewik, Jürgen; Ates, M., Artmann, Gerhard Michael JF - Biomedizinische Technik. 47 (2002), H. Suppl. 1. Pt. 1 Y1 - 2002 SN - 0013-5585 N1 - Druckausgabe unter 63 Z 47 vorhanden SP - 379 EP - 381 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 - Streun, M. A1 - Brandenburg, G. A1 - Larue, H. A1 - Zimmermann, E. A1 - Ziemons, Karl A1 - Halling, H. T1 - A PET system with free running ADCs JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment N2 - 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. Y1 - 2002 SN - 0168-9002 N1 - Proceedings of the 6th International Conference on Inorganic Scin tillators and their Use in Scientific and Industrial Applications VL - 486 IS - 1-2 SP - 18 EP - 21 ER - TY - JOUR A1 - Scheer, Nico A1 - Riedl, Iris A1 - Warren, J.T. A1 - Kuwada, John Y. A1 - Campos-Ortega, José A. T1 - A quantitative analysis of the kinetics of Gal4 activator and effector gene expression in the zebrafish JF - Mechanism of Development Y1 - 2002 U6 - http://dx.doi.org/10.1016/S0925-4773(01)00621-9 SN - 0925-4773 VL - 112 IS - 1-2 SP - 9 EP - 14 ER - TY - JOUR A1 - Naujokat, Anke T1 - Aachen: Colourdome JF - Bauwelt. 93 (2002), H. 37 Y1 - 2002 SN - 0931-6590 SP - 2 ER -