Fully evaporated solar cells using methylammonium iodide (MAI)-based perovskites can reach power conversion efficiencies exceeding 20%. An important point to advance perovskite photovoltaics is ensure reproducibility from batch batch. Sublimation control of organic ammonium halides critical in achieving this for cells. Herein, a reproducible procedure the coevaporation PbI2 and MAI based on an ...

We analyze a quasi-chemical model for bacterial growth in the context of a parameter estimation problem using available experimental data sets. For many of the data sets the dynamics are simple and we show that the quasi-chemical model (QCM) is over parameterized in these cases. This results in larger uncertainty in the estimated parameters and is some cases instability in the inverse problem. ...

Spreading of liquids and soft solids on a rigid surface in a surrounding liquid medium is investigated by utilizing the lateral sensitivity of the quartz crystal microbalance (QCM). While the QCM has been used extensively to study systems with spatial variations in the direction normal to the crystal's electrodes, few studies have exploited the QCM's ability to sense changes in loading in the p...

The introduction of serious games as pedagogical supports in the field of education is a process gaining in popularity amongst the teaching community. This article creates a link between the integration of new pedagogical solutions in first-year primary class and the fundamental research on the motivation of the players/learners, detailing an experiment based on a game specifically developed, n...

This paper describes the development and evaluation of a custom-built impedance analyser, which uses a multiplexing bridge circuit to characterise an array of polymer-coated quartz crystal microbalance (QCM) sensors. The analyser is constructed on a single printed circuit board with minimum components and is sufficiently compact for integration into a hand-held format. The custom-built device i...

We have developed a QCM (Quartz Crystal Microbalance) based method for direct gravimetric determination of water adsorption on PuO2 surrogate surfaces, especially CeO2, under conditions representative of those in a typical PuO2 storage can. In this application, the method of transduction of the QCM relies upon the linear relationship between the resonant frequency of piezoelectrically active qu...

The present work demonstrates a valuable approach to developing quartz crystal microbalance (QCM) sensor units inexpensively for reliable determination of analytes. This QCM sensor unit is constructed by inkjet printing equipment utilizing background noise removal techniques. Inkjet printing equipment was chosen as an alternative to an injection pump in conventional flow-mode systems to facilit...

We propose a simple quartet condensationmodel (QCM)which describes with very high accuracy the isovector pairing correlations in self-conjugate nuclei. The quartets have an α-like structure and are formed by collective isovector pairs. The accuracy of the QCM is tested forN = Z nuclei for which exact shell model diagonalizations can be performed. The calculations are done with two isovector pai...

In anaerobic digestion (AD), long-chain fatty acids (LCFAs) produced by hydrolysis of lipids, exhibit toxicity against microorganisms when their concentration exceeds several millimolar. An absorption detection system using a quartz crystal microbalance (QCM) was developed to monitor the LCFA concentration during an anaerobic digester’s operation treating oily organic waste. The dissociation of...