2071. Elucidating local pollution and site representativeness at the Jungfraujoch, Switzerland through parallel aerosol measurements at an adjacent mountain ridgeNicolas Bukowiecki, Benjamin Brem, Günther Wehrle, Griša Močnik, Stéphane Affolter, Markus Christian Leuenberger, Martine Collaud Coen, Maxime Hervo, Urs Baltensperger, Martin Gysel, 2021, original scientific article Abstract: Many long-term air pollution and climate monitoring stations face the issue of increasing anthropogenic activities in their vicinity. Furthermore, the spatial representativeness of the sites is often not entirely understood especially in mountainous terrain with complex topographic features. This study presents a 5-year comparison of parallel aerosol measurements (total particle number concentration and equivalent black carbon mass concentration) at the Jungfraujoch in the Swiss Alps (JFJ, 3580 m a.s.l.), and an adjacent mountain ridge, the Jungfrau East Ridge (JER, 3705 m a.s.l.), in 1000 m air-line distance to the main site. The parallel aerosol measurements reveal characteristic differences in the diurnal variations between the two sites under certain specific meteorological conditions. Our analysis estimates that on 20-40% of the days local activities at the Jungfraujoch have a clear influence on the measured time series of the total aerosol number concentration and the equivalent black carbon mass concentration. This influence is mainly seen in form of strong isolated spikes rather than by an increase in the on-site background concentration. They can thus be flagged during the data quality assurance process and filtered from those measurement parameters available at high time resolution. Removing the spikes from the original time series results in daily mean values for the total aerosol number concentration and equivalent black carbon mass concentration that are 5-10 % lower compared to the original signals. During nighttime with hardly any local pollution sources that cause spikes this percentage decreases towards 0%. The signal baselines at the Jungfraujoch and Jungfrau East Ridge correlate well during more than 50% of the days. Keywords: aerosol long-term monitoring, equivalent black carbon, aerosol number concentration, spatial variation Published in RUNG: 15.03.2021; Views: 1951; Downloads: 71 Link to full text This document has many files! More... |
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2073. Multiresponsive nonvolatile memories based on optically switchable ferroelectric organic field-effect transistorsMarco Carroli, Alex Dixon, Martin Herder, Egon Pavlica, Stefan Hecht, Gvido Bratina, Emanuele Orgiu, Paolo Samorì, 2021, original scientific article Abstract: Organic transistors are key elements for flexible, wearable, and biocompatible logic applications. Multiresponsivity is highly sought‐after in organic electronics to enable sophisticated operations and functions. Such a challenge can be pursued by integrating more components in a single device, each one responding to a specific external stimulus. Here, the first multiresponsive organic device based on a photochromic–ferroelectric organic field‐effect transistor, which is capable of operating as nonvolatile memory with 11 bit memory storage capacity in a single device, is reported. The memory elements can be written and erased independently by means of light or an electric field, with accurate control over the readout signal, excellent repeatability, fast response, and high retention time. Such a proof of concept paves the way toward enhanced functional complexity in optoelectronics via the interfacing of multiple components in a single device, in a fully integrated low‐cost technology compatible with flexible substrates. Keywords: organic transistors, memory, time-dependent Published in RUNG: 11.03.2021; Views: 2055; Downloads: 0 This document has many files! More... |
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2077. Nitrate as a probe of cytochrome c surface : crystallographic identification of crucial "hot spots" for protein-protein recognitionMatteo De March, Nicola Demitri, Rita De Zorzi, Angela Casini, Chiara Gabbiani, Annalisa Guerri, Luigi Messori, Silvano Geremia, 2014, original scientific article Keywords: cytochrome c, electron transfer complexes, electrostatic surface, redox protein Published in RUNG: 03.03.2021; Views: 2187; Downloads: 0 This document has many files! More... |
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2080. A structural, functional, and computational analysis suggests pore flexibility as the base for the poor selectivity of CNG channelsLuisa M. R. Napolitano, Ina Bisha, Matteo De March, Arin Marchesi, Manuel Arcangeletti, Nicola Demitri, Monica Mazzolini, Alex Rodriguez, Alessandra Magistrato, Silvia Onesti, 2015, original scientific article Keywords: CNG channels, pore flexibility, X-ray crystallography, MD simulations Published in RUNG: 03.03.2021; Views: 2145; Downloads: 0 This document has many files! More... |