41. Dynamics of phase synchronization between solar polar magnetic fields assessed with Van der Pol and Kuramoto modelsAnton Savostianov, Alexander Shapoval, M. Shnirman, 2020, izvirni znanstveni članek Opis: We establish the similarity in two model-based reconstructions of the coupling between the polar magnetic fields of the Sun represented by the solar faculae time series. The reconstructions are inferred from the pair of the coupled oscillators modelled with the Van der Pol and Kuramoto equations. They are associated with the substantial simplification of solar dynamo models and, respectively, a simple ad hoc model reproducing the phenomenon of synchronization. While the polar fields are synchronized, both of the reconstruction procedures restore couplings, which attain moderate values and follow each other rather accurately as the functions of time. We also estimate the evolution of the phase difference between the polar fields and claim that they tend to move apart more quickly than approach each other.
Ključne besede: solar hemispheres, solar faculae, synchronisation, coupled oscillators
Objavljeno v RUNG: 16.03.2021; Ogledov: 1832; Prenosov: 70
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42. Influence of very large spatial heterogeneity on estimates of sea-level trendsAlexander Shapoval, Jean-Louis Le Mouël, Vincent Courtillot, M. Shnirman, 2020, izvirni znanstveni članek Opis: We propose a new method to estimate sub-decadal to centennial time scales of sea-level change. Since the coastal data exhibit large spatial heterogeneity and temporal variability, the global sea-level rate is estimated as an appropriate average of the rates observed at available locations and computed with sliding windows. We claim that under such heterogeneity the median serves as a better representative of an adequate average than the mean. With this approach, the sea-level rate in 60 to 70 yr windows over the past century is found to be smaller than 1.7-1.9 mm/yr. These upper estimates are in line with those obtained with a scarce list of available long quasi-gapless series
Ključne besede: sea-level rise, median, sliding window, statistically significant trend
Objavljeno v RUNG: 16.03.2021; Ogledov: 1840; Prenosov: 0
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44. 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, izvirni znanstveni članek Opis: 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.
Ključne besede: organic transistors, memory, time-dependent
Objavljeno v RUNG: 11.03.2021; Ogledov: 1991; Prenosov: 0
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45. A modular method for the extraction of DNA and RNA, and the separation of DNA pools from diverse environmental sample typesMark Lever, Andrea Torti, Philip Eickenbusch, Alexander B. Michaud, Tina Šantl Temkiv, Bo Barker Jørgensen, 2015, izvirni znanstveni članek Ključne besede: DNA, RNA, extraction, environmentalsample, lowbiomass, modular, intracellular, extracellula
Objavljeno v RUNG: 04.01.2021; Ogledov: 2123; Prenosov: 173
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48. Photoelectric effect with a twistGiovanni De Ninno, Jonas Wätzel, Primož Rebernik Ribič, Enrico Allaria, Marcello Coreno, Miltcho B. Danailov, Christian David, Alexander Demidovich, Michele Di Fraia, Luca Giannessi, Klaus Hansen, Špela Krušič, Michele Manfredda, Micheal Meyer, Andrej Mihelič, Najmeh Mirian, Oksana Plekan, Barbara Ressel, Benedikt Rösner, Alberto Simoncig, Simone Spampinati, Janez Štupar, Matjaž Žitnik, Marco Zangrando, Carlo Callegari, Jamal Berakdar, 2020, izvirni znanstveni članek Opis: Photons have fixed spin and unbounded orbital angular momentum (OAM). While the former is manifested in the polarization of light, the latter corresponds to the spatial phase distribution of its wavefront1. The distinctive way in which the photon spin dictates the electron motion upon light– matter interaction is the basis for numerous well-established spectroscopies. By contrast, imprinting OAM on a mat- ter wave, specifically on a propagating electron, is gener- ally considered very challenging and the anticipated effect undetectable2. In refs. 3,4, the authors provided evidence of OAM-dependent absorption of light by a bound electron. Here, we seek to observe an OAM-dependent dichroic photo- electric effect, using a sample of He atoms. Surprisingly, we find that the OAM of an optical field can be imprinted coher- ently onto a propagating electron wave. Our results reveal new aspects of light–matter interaction and point to a new kind of single-photon electron spectroscopy.
Ključne besede: FEL, OAM, Photoelectric effect
Objavljeno v RUNG: 09.09.2020; Ogledov: 2867; Prenosov: 0
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49. Elucidation of Donor:Acceptor Phase Separation in Nonfullerene Organic Solar Cells and Its Implications on Device Performance and Charge Carrier MobilitySebastian F. Hoefler, Georg Haberfehlner, Thomas Rath, Andreas Keilbach, Mathias Hobisch, Alexander Dixon, Egon Pavlica, Gvido Bratina, Gerald Kothleitner, Ferdinand Hofer, Gregor Trimmel, 2019, izvirni znanstveni članek Opis: In bulk-heterojunction solar cells, the device performance strongly depends on the donor and acceptor properties, the phase separation in the absorber layer, and the formation of a bicontinuous network. While this phase separation is well explored for polymer:fullerene solar cells, only little is known for polymer:nonfullerene acceptor solar cells. The main hurdle in this regard is often the chemical similarity of the conjugated polymer donor and the organic nonfullerene acceptor (NFA), which makes the analysis of the phase separation via atomic force microscopic (AFM) phase images or conventional transmission electron microscopy difficult. In this work, we use the donor polymer PTB7-Th and the small molecule acceptor O-IDTBR as the model system and visualized the phase separation in PTB7-Th:O-IDTBR bulk-heterojunctions with different donor:acceptor ratios via scanning transmission electron microscopy (STEM) high-angle annular dark-field (HAADF) images and electron energy loss spectroscopy (EELS) based elemental mapping, which resulted in a good contrast between the donor and the acceptor despite very low differences in the chemical composition. AFM as well as grazing-incidence wide-angle X-ray scattering (GIWAXS) investigations support the electron microscopic data. Furthermore, we elucidate the implications of the phase separation on the device performance as well as charge carrier mobilities in the bulk-heterojunction layers, and a high performance of the solar cells was found over a relatively broad range of polymer domain sizes. This can be related to the larger domain sizes of the acceptor phase with higher amounts of O-IDTBR in the blend, while the polymer donor phase still forms continuous pathways to the electrode, which keeps the hole mobility at a relatively constant level.
Ključne besede: nanomorphology bulk-heterojunction scanning transmission electron microscopy organic photovoltaics charge carrier mobility
Objavljeno v RUNG: 15.01.2020; Ogledov: 2956; Prenosov: 85
Celotno besedilo (6,22 MB) |
50. Beyond the limits of 1D coherent synchrotron radiationA. D. Brynes, P. Smorenburg, I. Akkermans, Enrico Allaria, Laura Badano, S. Brussaard, M. B. Danailov, Alexander Demidovich, Giovanni De Ninno, David Gauthier, Primož Rebernik Ribič, 2018, izvirni znanstveni članek Ključne besede: coherent synchrotron radiation, free electron lasers, accelerators
Objavljeno v RUNG: 14.01.2020; Ogledov: 3203; Prenosov: 79
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