TY - JOUR A1 - Schneider, Johannes A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Gockel, Tilo T1 - Effiziente Entwärmung eines Hochleistungs-UV-LED-Moduls JF - Elektor, Sonderheft LEDs 3 KW - Lumineszenzdiode Y1 - 2011 VL - 2011 IS - 9 SP - 12 EP - 17 ER - TY - CHAP A1 - Hörner, Eugen A1 - Bochtler, Ulrich T1 - Funkdatenübertragung und drahtlose Energieversorgung eines Sensornetzwerkes auf Basis der Bausteine NRF2401 und CC2400 T2 - Wireless Technologie Kongress, Bochum KW - Funkübertragung KW - Sensorsystem Y1 - 2010 SN - 978-3-18-381010-9 SP - 247 EP - 256 PB - VDI Verlag CY - Düsseldorf ER - TY - JOUR A1 - Amrhein, Frank A1 - Kehrer, Martin A1 - Schreck, Timo A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - UV-LED-Bestrahlung von Vergussmaterial: Schnelle Aushärtung auch im Schatten JF - adhäsion KLEBEN & DICHTEN KW - Lumineszenzdiode Y1 - 2011 IS - 5 SP - 38 EP - 41 ER - TY - CHAP A1 - Hörner, Eugen A1 - Bochtler, Ulrich A1 - Cervellino, Roman A1 - Zentgraf, Ralf A1 - Trunzer, Dominic A1 - Wölfel, Maximilian A1 - Böttcher, Arthur A1 - Schneider, Johannes T1 - Drahtlose Hochtemperaturmessung mit Oberflächenwellensensoren (OW-Sensor) T2 - Energy Harvesting Congress, München KW - Oberflächenwellenelement Y1 - 2013 ER - TY - JOUR A1 - Amrhein, Frank A1 - Kehrer, Martin A1 - Schreck, Timo A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - More efficient curing of UV sensitive mounting materials JF - Practical metallography KW - Aushärtung Y1 - 2014 VL - 48 IS - 7 SP - 356 EP - 364 ER - TY - JOUR A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Amrhein, Frank A1 - Glaab, Johannes A1 - Kaloumenos, Mareiki A1 - Sauer, Michael A1 - Gockel, Tilo T1 - LUVLED - UV-Leistungslichtquelle auf Leuchtdiodenbasis JF - Elektor Sonderheft, LEDs 2 KW - Lumineszenzdiode Y1 - 2010 VL - 2011 IS - 2 SP - 57 EP - 63 PB - Elektor-Verlag CY - Aachen ER - TY - JOUR A1 - Amrhein, Frank A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Kaloumenos, Mareiki T1 - Vergleich der thermischen Eigenschaften unterschiedlicher insulated metal substrat-Leiterplatten JF - PLUS, Leiterplattentechnik KW - Gedruckte Schaltung KW - Trägersubstanz Y1 - 2010 IS - 8 SP - 1758 PB - Hanser Verlag CY - München ER - TY - JOUR A1 - Schneider, Johannes A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Gockel, Tilo T1 - LUVLED III – Optimierung eines Kühlkonzeptes zur Aktivluftkühlung eines Hochleistungs-UV-LED-Moduls JF - Zeitschrift ELEKTOR, Sonderheft LED-Special 4 – Leuchtdioden in Theorie und Praxis, 2012 KW - UV-LED Modul KW - Lumineszenzdiode Y1 - 2012 IS - 9 SP - 20 EP - 29 ER - TY - CHAP A1 - Hörner, Eugen A1 - Bochtler, Ulrich A1 - Trunzer, Dominic T1 - Adaptive Frequenz- und Impedanzanpassung einer induktiven Energieübertragung zur drahtlosen Versorgung eines Sensornetzwerkes T2 - Elektronik Wireless Power Congress 2012 KW - Frequenzanpassung KW - Drahtloses Sensorsystem Y1 - 2012 SN - 978-3-645-50077-7 PB - WEKA Fachmedia GmbH CY - Haar ER - TY - JOUR A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - Neuartige UV-Lichtquelle auf Leuchtdiodenbasis, Packaging und Hybridschaltungen JF - PLUS KW - Lumineszenzdiode Y1 - 2010 IS - 2 PB - Leuze-Verlag ER - TY - JOUR A1 - Rücker, Johannes A1 - Hesch, Heinz-Xaver A1 - Bochtler, Ulrich A1 - Klar, Peter J. T1 - Automatische Entstückung von Leiterplatten zur Rückgewinnung von Ressourcen JF - PLUS : Produktion von Leiterplatten und Systemen KW - Elektronikschrott KW - Demontage KW - Gedruckte Schaltung Y1 - 2012 VL - 2015 IS - 12 SP - 2472 EP - 2474 PB - Leuze-Verlag CY - Bad Saulgau ER - TY - GEN A1 - Heider, Michael A1 - Bochtler, Ulrich T1 - Trennung technischer Keramiken mit elektrischen Verfahren zur effizienteren Weiterverarbeitung und Wertstoffrückgewinnung N2 - Poster KW - Recycling KW - Elektrostatik KW - Energieeffizienz KW - Partikelfilter KW - Triboelektrik KW - Abfallwirtschaft KW - Elektrostatik Y1 - 2016 ER - TY - GEN A1 - Wang, Jiaxi A1 - Rücker, Johannes A1 - Hesch, Heinz-Xaver A1 - Bochtler, Ulrich A1 - Klar, Peter J. T1 - Analyse von elektronischen Altgeräten im Hinblick auf verbesserte Recyclingverfahren N2 - Poster KW - Recycling KW - Elektroschrott KW - Entstückung KW - Abfallwirtschaft KW - Elektronikschrott Y1 - 2016 ER - TY - CHAP A1 - Rücker, Johannes A1 - Hesch, Heinz-Xaver A1 - Bochtler, Ulrich A1 - Klar, Peter J. ED - Pretz, Thomas ED - Wotruba, Hermann T1 - Automated Segmentation of Electronic Components on Waste Printed Circuit Boards T2 - 7th Sensor-Based Sorting & Control 2016 KW - Recycling KW - WEEE KW - Segmentation KW - Computer Vision KW - Demontage KW - Elektronikschrott KW - Gedruckte Schaltung Y1 - 2016 SN - 978-3-8440-4323-5 SP - 179 EP - 185 PB - Shaker CY - Herzogenrath ER - TY - CHAP A1 - Rücker, Johannes A1 - Hesch, Heinz-Xaver A1 - Bochtler, Ulrich A1 - Klar, Peter J. ED - Pretz, Thomas ED - Wotruba, Hermann T1 - An empirical approach for more effective recycling of electronic components in WEEE T2 - 7th Sensor-Based Sorting & Control 2016 KW - Recycling KW - WEEE KW - Printed Circuit Board Assembly KW - Elektronikschrott KW - Recycling Y1 - 2016 SN - 9783844043235 SP - 249 EP - 258 PB - Shaker CY - Aachen ER - TY - CHAP A1 - Probst, Anne-Catherine A1 - Hitzinger, Hans A1 - Bochtler, Ulrich A1 - Wölfel, Maximilian A1 - Schmitt, Christoph ED - U.R.S.I. Landesausschuss in Deutschland e.V. 2021, T1 - High Frequency Power Amplifier for Wideband Wireless Communication Systems T2 - Proceedings of the 2021 Kleinheubach Conference N2 - Increasing data transmission rates and bandwidth both belong to the challenges of the development of high-performance wireless communication systems. Multi-channel communication systems commonly use several narrowband power amplifiers each one for a single communication channel. Lossy couplers are needed both to separate the different channels from each other at the amplifiers input and to combine the amplified signals on each channel at the output. This approach depicts a poor efficiency and is limited to a few number of channels since each channel duplication involves 3 dB losses due to couplers. Alternatively, broadband radio frequency power amplifiers ensuring the simultaneous transmission of several carriers on a wide frequency range contribute to increase the cost and resource efficiency of transceivers in wireless communication systems. Gain flatness, a high output power, and low power levels of second and third order harmonics are required on the whole operating frequency range of the power amplifier in multi-carrier communication systems since overtones will degrade the quality of the communication. The present work investigates the performances of a broadband push-pull power amplifier based on LDMOS transistors, the input matching network using a 8:1 transmission line transformer. For the first time investigations on harmonic distortions of the amplified signal when using a transformer with 8:1 impedance transformation ratio are presented. Characterisation of the power amplifiers performances is focused on gain flatness, output power, harmonic distortions and efficiency at 110 W. KW - LDMOS KW - broadband RF power amplifier KW - push-pull KW - transmission line transformer KW - harmonic distortion KW - Hochfrequenzverstärker KW - Leistungsverstärker KW - Kommunikationssystem Y1 - 2021 U6 - https://doi.org/10.23919/IEEECONF54431.2021.9598443 VL - 2021 ER - TY - JOUR A1 - Köhler, Tim A1 - Wölfel, Maximilian A1 - Ciba, Manuel A1 - Bochtler, Ulrich A1 - Thielemann, Christiane T1 - Terrestrial Trunked Radio (TETRA) exposure of neuronal in vitro networks JF - Environmental Research N2 - Terrestrial Trunked Radio (TETRA) is a worldwide common mobile communication standard, used by authorities and organizations with security tasks. Previous studies reported on health effects of TETRA, with focus on the specific pulse frequency of 17.64 Hz, which affects calcium efflux in neuronal cells. Likewise among others, it was reported that TETRA affects heart rate variability, neurophysiology and leads to headaches. In contrast, other studies conclude that TETRA does not affect calcium efflux of cells and has no effect on people's health. In the present study we examine whether TETRA short- and long-term exposure could affect the electrophysiology of neuronal in vitro networks. Experiments were performed with a carrier frequency of 395 MHz, a pulse frequency of 17.64 Hz and a differential quaternary phase-shift keying (π/4 DQPSK) modulation. Specific absorption rates (SAR) of 1.17 W/kg and 2.21 W/kg were applied. In conclusion, the present results do not indicate any effect of TETRA exposure on electrophysiology of neuronal in vitro networks, neither for short-term nor long-term exposure. This applies to the examined parameters spike rate, burst rate, burst duration and network synchrony. KW - Neuronales Netz Y1 - 2018 U6 - https://doi.org/10.1016/j.envres.2017.12.007 VL - 2018 IS - 162 SP - 1 EP - 7 ER - TY - JOUR A1 - Oster, Stefan A1 - Daus, Andreas A1 - Erbes, Christian A1 - Goldhammer, Michael A1 - Bochtler, Ulrich A1 - Thielemann, Christiane T1 - Long‐term electromagnetic exposure of developing neuronal networks: A flexible experimental setup JF - Bioelectromagnetics N2 - Neuronal networks in vitro are considered one of the most promising targets of research to assess potential electromagnetic field induced effects on neuronal functionality. A few exposure studies revealed there is currently no evidence of any adverse health effects caused by weak electromagnetic fields. Nevertheless, some published results are inconsistent. Particularly, doubts have been raised regarding possible athermal biological effects in the young brain during neuronal development. Therefore, we developed and characterized a flexible experimental setup based on a transverse electromagnetic waveguide, allowing controlled, reproducible exposure of developing neuronal networks in vitro. Measurement of S‐parameters confirmed very good performance of the Stripline in the band of 800–1000 MHz. Simulations suggested a flexible positioning of cell culture dishes throughout a large exposure area, as specific absorption rate values were quite independent of their position (361.7 ± 11.4 mW/kg) at 1 W, 900 MHz. During exposure, thermal drift inside cellular medium did not exceed 0.1 K. Embryonic rat cortical neurons were cultivated on microelectrode array chips to non‐invasively assess electrophysiological properties of electrogenic networks. Measurements were taken for several weeks, which attest to the experimental setup being a reliable system for long‐term studies on developing neuronal tissue. KW - RF exposure setup KW - mobile communication frequencies KW - SAR dosimetry KW - microelectrode array KW - electrophysiology KW - Neuronales Netz KW - Mikroelektrode KW - Array Y1 - 2016 U6 - https://doi.org/10.1002/bem.21974 VL - 2016 IS - 37 SP - 264 EP - 278 ER - TY - CHAP A1 - Daus, Andreas A1 - Oster, Stefan A1 - Erbes, Christian A1 - Goldhammer, Michael A1 - Bochtler, Ulrich A1 - Thielemann, Christiane T1 - Electromagnetic exposure of neuronal networks on microelectrode arrays T2 - U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V., Kleinheubacher Tagung, Miltenberg, Abstracts KW - Neuronales Netz KW - Mikroelektrode KW - Array Y1 - 2013 SP - 29 EP - 30 ER - TY - CHAP A1 - Oster, Stefan A1 - Daus, Andreas A1 - Goldhammer, Michael A1 - Bochtler, Ulrich A1 - Thielemann, Christiane T1 - A Flexible RF Exposure Setup for Long-term Electrophysiological Investigations on Biological Samples in Vitro T2 - Progress In Electromagnetics Research Symposium Abstracts, Stockholm, Schweden KW - Neuronales Netz KW - Array KW - Mikroelektrode Y1 - 2013 ER - TY - CHAP A1 - Goldhammer, Michael A1 - Daus, Andreas A1 - Thielemann, Christiane A1 - Bochtler, Ulrich T1 - Flexible measurement setup for electromagnetic exposition of biological samples T2 - BioEM 2009, Davos, Switzerland KW - Elektromagnetische Strahlung KW - Messung Y1 - 2014 ER -