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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: van Soesbergen, A.; Brouwer, R.; Baan, P.; Hellegers, P.J.G.J.; +1 Authors
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    Report . Other literature type . 2007
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    Report . 2008
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      Report . Other literature type . 2007
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      Report . 2008
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Other literature type . 2015
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      Other literature type . 2015
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    We have developed a novel diffraction grating based on lithographical techniques and anisotropic etching in silicon. The grating is designed for the short-wave-infrared channel of the TROPOMI imaging spectrometer that will be launched on ESA's Sentinel 5 Precursor mission to monitor trace gases in the earth atmosphere. Stringent requirements on both the imaging properties and the quality of the spectra translate to a high-tech grating. In our design the dispersion and resolution is increased with a factor 3.4 with respect to conventional gratings by using the grating in immersion, such that diffraction takes place inside the silicon grating material. By lithographic patterning and anisotropic etching of the mono-crystalline silicon we precisely control line spacing and blaze angle. The grating has a line spacing of 2.5 μm and is operated in sixth order. We show that an efficiency of 60% is reached on a 50 x 60 mm2 grating surface. We compare our test results with numerical calculations for grating efficiency for both polarizations and find good agreement. © 2010 Copyright SPIE - The International Society for Optical Engineering.

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    Article . 2010
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      Article . 2010
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    Article . 1990
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      Article . 1990
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    Authors: Simis, S.G.H.;
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    Doctoral thesis . 2006
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    Doctoral thesis . 2006
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      Doctoral thesis . 2006
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      Doctoral thesis . 2006
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Conference object . 2005
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      Conference object . 2005
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    In 1981 ESA (European Space Agency) organized a large measurement campaign in Europe to stimulate the interest in radar, especially SAR. The Canadian SAR 580 system visited testsites during a 1 month period. Imagery was acquired in X, C and L band. Since several experiments called for calibrated measurement values, a calibration program was added, consisting of flights over calibration sites in the UK and Germany. On these site corner reflectors were set up. The results of this calibration will be presented to all participants. One of the test sites in The Netherlands was located in the Flevopolder, an agricultural area. During the growing season and especially during the SAR-580 flights scatterometer measurements were made here. The Dutch digital SLAR system operated at the same time. The knowledge on the radar signature of crops can be used to calibrate the SAR-580 images, like it has been done for the Dutch digital SLAR system. Unfortunately the quality of the SAR-580 data was too bad to enable this calibration and to compare the data with our SLAR system and scatterometer. Nevertheless the method is worthwile te be reported.

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    Article . 1983
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      Article . 1983
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    Since the introduction of Transkribus, a platform for digitization and transcription of historical documents, several projects working with collections of handwritten personal correspondence from before, during, and after World War II have emerged. In these projects, digitization includes scanning, transcribing, annotating, and curating digital versions of historical ‘egodocuments’. These different transformative processes come, however, with a series of problems, challenges, and questions. In January 2022, Nina Janz (Luxembourg Centre for Contemporary and Digital History, C2DH) and Milan van Lange (NIOD Institute for War, Holocaust, and Genocide Studies) brought together various projects to identify these issues. In this blogpost, Janz and Van Lange reflect on this first step in building a community of interested researchers and archivists around problem-solving approaches to these issues.

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    Other literature type . 2022
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      Other literature type . 2022
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    Report . 1994
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      Report . 1994
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    The Dutch PHARUS project aims for the developrlenÈ of a polarimetric C-band aircraft SAR, to be finalized in 1994. The PHARUS systen consists of three subsystens: the radar, the subsystem for the onboard data processing and recording and the ground-based subsystem for SAR processing. PHARUS is a very flexible system with numerous operating modes, intended for renote sensing research. Modes vary from a straighc forward single mode (e.g. HH polarisation)to a full polarimetric mode with alternating chirp patterns. This paper describes selected items of the onboard data processlng and recording subsystem, as it is under construction now. Data processing starts with high speed digitization of the offsec modulated radar slgnals. The digitized offsec modulated signals are demodulated and re-sampled (in range) to complex base band signals. A low pass filtering and decimation in flight direction is performed. Finally, pulse cornpression is performed based on FFT and IFFT.

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    Article . 1992
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    Authors: van Soesbergen, A.; Brouwer, R.; Baan, P.; Hellegers, P.J.G.J.; +1 Authors
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    Report . Other literature type . 2007
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    We have developed a novel diffraction grating based on lithographical techniques and anisotropic etching in silicon. The grating is designed for the short-wave-infrared channel of the TROPOMI imaging spectrometer that will be launched on ESA's Sentinel 5 Precursor mission to monitor trace gases in the earth atmosphere. Stringent requirements on both the imaging properties and the quality of the spectra translate to a high-tech grating. In our design the dispersion and resolution is increased with a factor 3.4 with respect to conventional gratings by using the grating in immersion, such that diffraction takes place inside the silicon grating material. By lithographic patterning and anisotropic etching of the mono-crystalline silicon we precisely control line spacing and blaze angle. The grating has a line spacing of 2.5 μm and is operated in sixth order. We show that an efficiency of 60% is reached on a 50 x 60 mm2 grating surface. We compare our test results with numerical calculations for grating efficiency for both polarizations and find good agreement. © 2010 Copyright SPIE - The International Society for Optical Engineering.

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    Article . 1990
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      Article . 1990
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    Authors: Simis, S.G.H.;
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    In 1981 ESA (European Space Agency) organized a large measurement campaign in Europe to stimulate the interest in radar, especially SAR. The Canadian SAR 580 system visited testsites during a 1 month period. Imagery was acquired in X, C and L band. Since several experiments called for calibrated measurement values, a calibration program was added, consisting of flights over calibration sites in the UK and Germany. On these site corner reflectors were set up. The results of this calibration will be presented to all participants. One of the test sites in The Netherlands was located in the Flevopolder, an agricultural area. During the growing season and especially during the SAR-580 flights scatterometer measurements were made here. The Dutch digital SLAR system operated at the same time. The knowledge on the radar signature of crops can be used to calibrate the SAR-580 images, like it has been done for the Dutch digital SLAR system. Unfortunately the quality of the SAR-580 data was too bad to enable this calibration and to compare the data with our SLAR system and scatterometer. Nevertheless the method is worthwile te be reported.

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    Since the introduction of Transkribus, a platform for digitization and transcription of historical documents, several projects working with collections of handwritten personal correspondence from before, during, and after World War II have emerged. In these projects, digitization includes scanning, transcribing, annotating, and curating digital versions of historical ‘egodocuments’. These different transformative processes come, however, with a series of problems, challenges, and questions. In January 2022, Nina Janz (Luxembourg Centre for Contemporary and Digital History, C2DH) and Milan van Lange (NIOD Institute for War, Holocaust, and Genocide Studies) brought together various projects to identify these issues. In this blogpost, Janz and Van Lange reflect on this first step in building a community of interested researchers and archivists around problem-solving approaches to these issues.

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    Report . 1994
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      Report . 1994
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    The Dutch PHARUS project aims for the developrlenÈ of a polarimetric C-band aircraft SAR, to be finalized in 1994. The PHARUS systen consists of three subsystens: the radar, the subsystem for the onboard data processing and recording and the ground-based subsystem for SAR processing. PHARUS is a very flexible system with numerous operating modes, intended for renote sensing research. Modes vary from a straighc forward single mode (e.g. HH polarisation)to a full polarimetric mode with alternating chirp patterns. This paper describes selected items of the onboard data processlng and recording subsystem, as it is under construction now. Data processing starts with high speed digitization of the offsec modulated radar slgnals. The digitized offsec modulated signals are demodulated and re-sampled (in range) to complex base band signals. A low pass filtering and decimation in flight direction is performed. Finally, pulse cornpression is performed based on FFT and IFFT.

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    Article . 1992
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      Article . 1992
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