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  • 1
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    Eigenmodes in the Long-Time Behavior of a Coupled Spin System Measured with Nuclear Magnetic Resonance (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-04-26
    Description: Author(s): Benno Meier, Jonas Kohlrautz, and Jürgen Haase The many-body quantum dynamics of dipolar coupled nuclear spins I =1/2 on an otherwise isolated cubic lattice are studied with nuclear magnetic resonance. By increasing the signal-to-noise ratio by 2 orders of magnitude compared with previous reports for the free induction decay (FID) of 19 F in CaF 2 ... [Phys. Rev. Lett. 108, 177602] Published Wed Apr 25, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Are urban areas endangering the availability of rainfed crop suitable land? (2012)
    Taylor & Francis
    Details
    Publication Date: 2012-02-06
    Print ISSN: 2150-704X
    Electronic ISSN: 2150-7058
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Published by Taylor & Francis
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  • 3
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    Analysis of the frequency conversion of spurious tones in frequency dividers and development of an event-driven model for system simulations (2019)
    Copernicus
    Details
    Publication Date: 2019-09-19
    Description: This paper presents a frequency domain analysis of spurious tones in frequency dividers. The results of the analysis are used to develop an event-driven model for system simulations which work entirely in the frequency domain. The proposed approach is able to provide a fast and accurate model in a SystemVerilog/C++ environment which takes the frequency conversion effects of the spurious tones into account. A virtual prototype which includes the model was simulated and due to the fast simulation speed it was possible to determine the influence of spurious tones on the bit error rate in a complex receive scenario.
    Print ISSN: 1684-9965
    Electronic ISSN: 1684-9973
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Copernicus on behalf of International Union of Radio Science, U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V..
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  • 4
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    A global approach to estimate irrigated areas – a comparison between different data and statistics (2018)
    Copernicus
    Details
    Publication Date: 2018-02-09
    Description: Agriculture is the largest global consumer of water. Irrigated areas constitute 40 % of the total area used for agricultural production (FAO, 2014a) Information on their spatial distribution is highly relevant for regional water management and food security. Spatial information on irrigation is highly important for policy and decision makers, who are facing the transition towards more efficient sustainable agriculture. However, the mapping of irrigated areas still represents a challenge for land use classifications, and existing global data sets differ strongly in their results. The following study tests an existing irrigation map based on statistics and extends the irrigated area using ancillary data. The approach processes and analyzes multi-temporal normalized difference vegetation index (NDVI) SPOT-VGT data and agricultural suitability data – both at a spatial resolution of 30 arcsec – incrementally in a multiple decision tree. It covers the period from 1999 to 2012. The results globally show a 18 % larger irrigated area than existing approaches based on statistical data. The largest differences compared to the official national statistics are found in Asia and particularly in China and India. The additional areas are mainly identified within already known irrigated regions where irrigation is more dense than previously estimated. The validation with global and regional products shows the large divergence of existing data sets with respect to size and distribution of irrigated areas caused by spatial resolution, the considered time period and the input data and assumption made.
    Print ISSN: 1027-5606
    Electronic ISSN: 1607-7938
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 5
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    Extending global irrigation maps – going beyond statistics (2017)
    Copernicus
    Details
    Publication Date: 2017-04-05
    Description: Agriculture is the largest global consumer of water. Irrigated areas contribute to 40 % of the agricultural production. Information on their spatial distribution is highly relevant for regional water management and food security. Spatial information on irrigation is highly important for policy and decision makers who are facing the transition towards a more efficient sustainable agriculture. However, existing global datasets are coarse and the mapping of irrigated areas still represents a challenge for land classifications. The following study extends existing irrigation maps that are based on statistics. The approach processes and analyses spatial data incrementally in a multi decision tree by using multi-temporal NDVI SPOT-VGT data and agricultural suitability data – both at a spatial resolution of 30 arc seconds. It covers the period from 1999 to 2012. The result exceeds the resolution of existing global studies and is not restricted to official reports made by surveys. Irrigated areas that were not yet included in the reports could be identified. The results globally show 22 % more irrigated areas than existing approaches and statistical data. The largest differences compared to existing data are found in Asia and particularly in China and India. The additional areas are mainly identified within already known irrigated regions where irrigation is more dense than previously estimated.
    Print ISSN: 1812-2108
    Electronic ISSN: 1812-2116
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 6
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    Global Irrigated Areas (2018)
    PANGAEA
    In:  Supplement to: Meier, Jonas; Zabel, Florian; Mauser, Wolfram (2018): A global approach to estimate irrigated areas – a comparison between different data and statistics. Hydrology and Earth System Sciences, 22(2), 1119-1133, https://doi.org/10.5194/hess-22-1119-2018
    Details
    Publication Date: 2023-01-13
    Description: Agriculture is the largest global consumer of water. Irrigated areas constitute 40 % of the total area used for agricultural production (FAO, 2014a) Information on their spatial distribution is highly relevant for regional water management and food security. Spatial information on irrigation is highly important for policy and decision makers, who are facing the transition towards more efficient sustainable agriculture. However, the mapping of irrigated areas still represents a challenge for land use classifications, and existing global data sets differ strongly in their results. The following study tests an existing irrigation map based on statistics and extends the irrigated area using ancillary data. The approach processes and analyzes multi-temporal normalized difference vegetation index (NDVI) SPOT-VGT data and agricultural suitability data - both at a spatial resolution of 30arcsec - incrementally in a multiple decision tree. It covers the period from 1999 to 2012. The results globally show a 18 % larger irrigated area than existing approaches based on statistical data. The largest differences compared to the official national statistics are found in Asia and particularly in China and India. The additional areas are mainly identified within already known irrigated regions where irrigation is more dense than previously estimated. The validation with global and regional products shows the large divergence of existing data sets with respect to size and distribution of irrigated areas caused by spatial resolution, the considered time period and the input data and assumption made.
    Type: Dataset
    Format: application/zip, 4.5 MBytes
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