10 libri per 10 euro qui
Bookbot

Christian Bur

    Denn Du bist da
    Selectivity enhancement of gas sensitive field effect transistors by dynamic operation
    • 2020

      Denn Du bist da

      Drei Gospelsongs für junggebliebene Chöre

      Die vertonten Texte in deutscher Sprache zu Themen wie Hoffnung, Vertrauen und Lobpreis bieten eine erfrischende Alternative zu den typischen englischen Gospelsongs. Die Melodien sind eingängig und variieren von sanft und berührend bis hin zu kraftvoll und schwungvoll. Die Sammlung eignet sich hervorragend für Aufführungen mit vierstimmigem Chor, Klavier- oder Bandbegleitung sowie Solisten und Bodypercussion. Sie ist eine ideale Wahl für junge und junggebliebene Chöre und bringt die Lebensfreude und Kraft des Glaubens zum Ausdruck. Die Aufführungsdauer beträgt 11 Minuten.

      Denn Du bist da
    • 2015

      Gas sensitive field effect transistors based on silicon carbide (SiC-FETs) have been utilized primarily for exhaust and combustion monitoring. Traditionally, these sensors operate at constant temperatures, with adaptations made through material and transducer platform optimization. This thesis systematically develops a methodology for dynamic operation to enhance selectivity in SiC-FETs. It introduces temperature cycling, a technique familiar in metal oxide gas sensors, and incorporates gate bias modulation to further improve performance. The multi-dimensional sensor data is analyzed using pattern recognition techniques grounded in multivariate statistics, exploring various strategies for feature selection, cross-validation, and classification methods. The dynamic operation methodology, applying a virtual multi-sensor approach to SiC-FETs, is validated through two laboratory case studies: one focusing on the discrimination of typical exhaust gases and quantification of nitrogen oxides in varying backgrounds, and another on the discrimination and quantification of volatile organic compounds in the low parts-per-billion range for indoor air quality. The selectivity of SiC-FETs is further enhanced by combining temperature and gate bias cycling, while stability is improved through extended training.

      Selectivity enhancement of gas sensitive field effect transistors by dynamic operation