Zobrazeno 1 - 10
of 136
pro vyhledávání: '"U. Feiste"'
Autor:
I. Fountoulakis, A. Redondas, K. Lakkala, A. Berjon, A. F. Bais, L. Doppler, U. Feister, A. Heikkila, T. Karppinen, J. M. Karhu, T. Koskela, K. Garane, K. Fragkos, V. Savastiouk
Publikováno v:
Atmospheric Measurement Techniques, Vol 10, Pp 4491-4505 (2017)
Spectral measurements of global UV irradiance recorded by Brewer spectrophotometers can be significantly affected by instrument-specific optical and mechanical features. Thus, proper corrections are needed in order to reduce the associated uncerta
Externí odkaz:
https://doaj.org/article/75088e7525d84b59b5f2a351f18dba6d
Autor:
P. N. den Outer, A. van Dijk, H. Slaper, A. V. Lindfors, H. De Backer, A. F. Bais, U. Feister, T. Koskela, W. Josefsson
Publikováno v:
Atmospheric Measurement Techniques, Vol 5, Iss 12, Pp 3041-3054 (2012)
Long-term analysis of cloud effects on ultraviolet (UV) radiation on the ground using spaceborne observations requires the use of instruments that have operated consecutively. The longest data record can be built from the reflectivity measurements pr
Externí odkaz:
https://doaj.org/article/f29fcd7b7b714d2a9324d5836ef38564
Autor:
C. S. Zerefos, K. Tourpali, K. Eleftheratos, S. Kazadzis, C. Meleti, U. Feister, T. Koskela, A. Heikkilä
Publikováno v:
Atmospheric Chemistry and Physics, Vol 12, Iss 5, Pp 2469-2477 (2012)
This study examines the long-term variability of UV solar irradiances at 305 nm and 325 nm over selected sites in Canada, Europe and Japan. Site selection was restricted to the availability of the most complete UV spectroradiometric datasets during t
Externí odkaz:
https://doaj.org/article/e25ffadfc32e4407929dd8ab064a57b2
Autor:
U. Feister, J. Junk, M. Woldt, A. Bais, A. Helbig, M. Janouch, W. Josefsson, A. Kazantzidis, A. Lindfors, P. N. den Outer, H. Slaper
Publikováno v:
Atmospheric Chemistry and Physics, Vol 8, Iss 12, Pp 3107-3118 (2008)
Artificial Neural Networks (ANN) are efficient tools to derive solar UV radiation from measured meteorological parameters such as global radiation, aerosol optical depths and atmospheric column ozone. The ANN model has been tested with different comb
Externí odkaz:
https://doaj.org/article/5eec5997da3b4d8189bcdd5bfc1c65be
Publikováno v:
Atmospheric Chemistry and Physics, Vol 8, Iss 9, Pp 2493-2508 (2008)
Cloud impacts on the transfer of ultraviolet (UV) radiation through the atmosphere can be assessed by using a cloud modification factor (CMF). CMF, which is based on total global solar irradiation (SOLCMF), has proved to be a solid basis to derive CM
Externí odkaz:
https://doaj.org/article/38fdd97d9f8f443aa6c3e3c88e634009
Autor:
R. Ludwig, H.G. Weber, U. Feiste, D. Briggmann, C. Schubert, J. Berger, C. Schmidt, F. Kueppers, Bernhard Schmauss, A. Munk, F. Rumpf, B. Buchold
Publikováno v:
IEE Proceedings - Optoelectronics. 148:171-175
T. Systems Nova, Technologiezentrum, the first 160 Gbit/s RZ transmission experiment over field-installed standard fibre G.652 is reported. The transmitter rests upon the optical time division multiplexing (OTDM) technique. At the receiver, a 160 Gbi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e33db107f16a2bc4be826410bae03715
https://doi.org/10.1049/ip-opt:20010689
https://doi.org/10.1049/ip-opt:20010689
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 6:258-262
An accurate modeling of very high bit-rate transmission systems over standard-fiber using mid-span spectral inversion (MSSI) is reported. As for the pulsewidth, comparison of simulations with experimental data in an 80-Gb/s transmission system over 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f7ce4516d92bafd2dbcadaccc8f003e1
https://doi.org/10.1109/2944.847761
https://doi.org/10.1109/2944.847761
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 1:535-538
Two-section, 1.55-/spl mu/m quantum-well DFB lasers, with a very high kappa of 300/cm, show self-pulsation at a record frequency of 80 GHz. An extremely wide, continuous, electrical frequency tuning range, from 12-64 GHz, is achieved. The present sel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad386b56642513f6e33de2261ac912a6
https://doi.org/10.1109/2944.401239
https://doi.org/10.1109/2944.401239
Autor:
Reinhold Ludwig, Klaus Petermann, J. Berger, V. Krajinovic, U. Feiste, G. Toptchiyski, Colja Schubert, Stefan Diez, H.G. Weber
Publikováno v:
IEEE Photonics Technology Letters. 13:475-477
We report on an all-optical demultiplexer based on gain-transparent operation of a semiconductor optical amplifier (SOA) in an ultrafast-nonlinear interferometer (GT-UNI). The GT-UNI comprises a robust fiber-chip setup in a folded geometry. For switc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dad7f2dda5378a0a9d84c173d25cc608
https://doi.org/10.1109/68.920756
https://doi.org/10.1109/68.920756
Autor:
Reinhold Ludwig, H.J. Ehrke, E. Dietrich, Christian Schmidt, E. Patzak, T. Merker, U. Feiste, Stefan Diez, H.G. Weber
Publikováno v:
IEEE Photonics Technology Letters. 11:1063-1065
We report on 80-Gb/s transmission over 106 km of standard-fiber (D=16 ps/km/nm) using midspan spectral inversion. The optical phase conjugated signal is generated by four-wave mixing in a semiconductor optical amplifier (SOA). The SOA is implemented
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7dc202357e7b99a593d0b43511f8334f
https://doi.org/10.1109/68.775347
https://doi.org/10.1109/68.775347