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6. Unmanned Aerial Systems (UAS)-Based Methods for Solar Induced Chlorophyll Fluorescence (SIF) Retrieval with Non-Imaging Spectrometers: State of the Art

Author

Vargas, J, Bendig, J, Mac Arthur, A, Burkart, A, Julitta, T, Maseyk, K, Thomas, R, Siegmann, B, Rossini, M, Celesti, M, Schüttemeyer, D, Kraska, T, Muller, O, Rascher, U, Vargas, Juan Quirós, Bendig, Juliane, Mac Arthur, Alasdair, Burkart, Andreas, Julitta, Tommaso, Maseyk, Kadmiel, Thomas, Rick, Siegmann, Bastian, Rossini, Micol, Celesti, Marco, Schüttemeyer, Dirk, Kraska, Thorsten, Muller, Onno, Rascher, Uwe, Vargas, J, Bendig, J, Mac Arthur, A, Burkart, A, Julitta, T, Maseyk, K, Thomas, R, Siegmann, B, Rossini, M, Celesti, M, Schüttemeyer, D, Kraska, T, Muller, O, Rascher, U, Vargas, Juan Quirós, Bendig, Juliane, Mac Arthur, Alasdair, Burkart, Andreas, Julitta, Tommaso, Maseyk, Kadmiel, Thomas, Rick, Siegmann, Bastian, Rossini, Micol, Celesti, Marco, Schüttemeyer, Dirk, Kraska, Thorsten, Muller, Onno, and Rascher, Uwe

Abstract

Chlorophyll fluorescence (ChlF) information offers a deep insight into the plant physiological status by reason of the close relationship it has with the photosynthetic activity. The unmanned aerial systems (UAS)-based assessment of solar induced ChlF (SIF) using non-imaging spectrometers and radiance-based retrieval methods, has the potential to provide spatio-temporal photosynthetic performance information at field scale. The objective of this manuscript is to report the main advances in the development of UAS-based methods for SIF retrieval with non-imaging spectrometers through the latest scientific contributions, some of which are being developed within the frame of the Training on Remote Sensing for Ecosystem Modelling (TRuStEE) program. Investigations from the Universities of Edinburgh (School of Geosciences) and Tasmania (School of Technology, Environments and Design) are first presented, both sharing the principle of the spectroradiometer optical path bifurcation throughout, the so called 'Piccolo-Doppio' and 'AirSIF' systems, respectively. Furthermore, JB Hyperspectral Devices' ongoing investigations towards the closest possible characterization of the atmospheric interference suffered by orbital platforms are outlined. The latest approach focuses on the observation of one single ground point across a multiple-kilometer atmosphere vertical column using the high altitude UAS named as AirFloX, mounted on a specifically designed and manufactured fixed wing platform: 'FloXPlane'. We present technical details and preliminary results obtained from each instrument, a summary of their main characteristics, and finally the remaining challenges and open research questions are addressed. On the basis of the presented findings, the consensus is that SIF can be retrieved from low altitude spectroscopy. However, the UAS-based methods for SIF retrieval still present uncertainties associated with the current sensor characteristics and the spatio-temporal mismatching betwe

Published
2020

9. Photochemical reactions of nitroso oxides at low temperatures: the first experimental evidence for dioxaziridines

Author

Harder, T., Wessig, P., Bendig, J., and Stosser, R.

Subjects
Oxides -- Research, Nitroso compounds -- Research, Photochemical research -- Case studies, Chemistry
Abstract

A study on the properties of ROO species such as carbonyl oxides, dioxiranes, nitroso oxides and dioxaziridines reports on the generation of nitroso oxides at low temperatures, on their UV/vis and ESR spectroscopic properties and on their photochemical reactions. A detailed scrutiny of the photochemical reactions of nitroso oxides unearthed the first experimental evidence for the existence of dioxaziridines. Experimental methodology, results and conclusions are discussed.

Published
1999

18. Regeneration in the Axolotl nervous system visualized by label-free multiphoton microscopy

Author

Bendig, J, Wohlers, J, Uckermann, O, Later, R, Schackert, G, Tanaka, E, Steiner, G, and Kirsch, M

Subjects
Spinal cord, Axolotl, ddc: 610, genetic structures, nervous system, natural sciences, 610 Medical sciences, Medicine, Multiphoton microscopy
Abstract

Objective: Regeneration of the CNS and PNS cannot be monitored until we have a final functional readout: movement or paresis. Therefore, there is an urgent need for in vivo imaging modalities to analyse and control therapeutic impact after damage to the nervous system. We investigated time-dependent[for full text, please go to the a.m. URL], 67. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), 1. Joint Meeting mit der Koreanischen Gesellschaft für Neurochirurgie (KNS)

Published
2016
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23. On the existence of conjugated dinitrenes at 77 K

Author

Harder, T., Bendig, J., Scholz, G., and Stosser, R.

Subjects
Diazo compounds -- Research, Nitrogen compounds -- Research, Aromatic compounds -- Research, Photochemical research -- Case studies, Chemistry
Abstract

Mechanistic, chemical and spectroscopic observations of the photolysis of 4,4'-diazidostilbene are analyzed. Specifically, the primary and secondary products resulting from the ultraviolet/vis irradiation of the aromatic biazide at 77 K was compared with other substituted mononitrene precursors via a kinetic analysis. The biphotonic reactions culminated in the formation of a triplet mononitrene caused by two-fold hydrogen abstraction from the solvent.

Published
1996

31. Transmission Networks and Population Turnover of Echovirus 30

Author

Leitch, E. C. McWilliam, primary, Bendig, J., additional, Cabrerizo, M., additional, Cardosa, J., additional, Hyypiä, T., additional, Ivanova, O. E., additional, Kelly, A., additional, Kroes, A. C. M., additional, Lukashev, A., additional, MacAdam, A., additional, McMinn, P., additional, Roivainen, M., additional, Trallero, G., additional, Evans, D. J., additional, and Simmonds, P., additional

Published
2009
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