Searched for: subject:"Inversion"
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Weemstra, C. (author), de Laat, J.I. (author), Verdel, A. (author), Smets, P. (author)
Instrumental timing and phase errors are a notorious problem in seismic data acquisition and processing. These can be frequency independent, for example due to clock drift, but may also be frequency dependent, for example due to imperfectly known instrument responses. A technique is presented that allows both types of errors to be recovered in a...
article 2021
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Piedvache, A. (author), van Buuren, S. (author), Barros, H. (author), Ribeiro, A.I. (author), Draper, E. (author), Zeitlin, J. (author), EPICE Research group, (author)
Background: Loss to follow-up is a major challenge for very preterm (VPT) cohorts; attrition is associated with social disadvantage and parents with impaired children may participate less in research. We investigated the impact of loss to follow-up on the estimated prevalence of neurodevelopmental impairment in a VPT cohort using different...
article 2021
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Szenasi, B. (author), Berchet, A. (author), Broquet, G. (author), Segers, A.J. (author), Denier van der Gon, H.A.C. (author), Krol, M. (author), Hullegie, J.J.S. (author), Kiesow, A. (author), Gunther, D. (author), Roxana Petrescu, A.M. (author), Saunois, M. (author), Bousquet, P. (author), Pison, I. (author)
This study aims at estimating errors to be accounted for in atmospheric inversions of methane (CH4) emissions at the European scale. Four types of errors are estimated in the concentration space over the model domain and at selected measurement sites. Furthermore, errors in emission inventories are estimated at country and source sector scales....
article 2021
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Peter, C. (author), Borello, E. Salina (author), Dalman, R.A.F. (author), Karamitopoulos, P. (author), Busschers, F. (author), Sacchi, Q. (author), Verga, F. (author)
Stratigraphic forward modelling (SFM) provides the means to produce geologically coherent and realistic models. In this paper, we demonstrate the possibility of matching lithological variability simulated with a basin-scale advection-diffusion SFM to a data-rich real-world setting, i.e. the Holocene Rhine-Meuse fluvio-deltaic system in the...
article 2020
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Vijn, A.R.P.J. (author), Baas, O. (author), Lepelaars, E.S.A.M. (author)
The purpose of this article is to estimate the parameters of the Jiles-Atherton hysteresis model, based on minor-loop measurement data in weak applied fields. The well-known hysteresis model by Jiles and Atherton serves as a basis of this article with an extension for the closure of minor loops. In order to represent minor loops correctly, a...
article 2020
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Zhang, Y. (author), Gautam, R. (author), Pandey, S. (author), Omara, M. (author), Maasakkers, J.D. (author), Sadavarte, P. (author), Lyon, D. (author), Nesser, H. (author), Sulprizio, M.P. (author), Varon, D.J. (author), Zhang, R. (author), Houweling, S. (author), Zavala-Araiza, D. (author), Alvarez, R.A. (author), Lorente, A. (author), Hamburg, S.P. (author), Aben, I. (author), Jacob, D.J. (author)
Using new satellite observations and atmospheric inverse modeling, we report methane emissions from the Permian Basin, which is among the world's most prolific oil-producing regions and accounts for >30% of total U.S. oil production. Based on satellite measurements from May 2018 to March 2019, Permian methane emissions from oil and natural gas...
article 2020
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Vijn, A.R.P.J. (author), Lepelaars, E.S.A.M. (author), Dubbeldam, J. (author), van Gijzen, M. (author), Heemink, A. (author)
This paper presents a parameter estimation method to determine the linear behavior of an object constructed of thin plates. Based on the magnetostatic field equations, an integral equation is derived that fully determines the induced magnetization, whenever the spatial magnetic susceptibility distribution is known. This forward problem is used...
article 2019
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Jin, J. (author), Segers, A.J. (author), Heemink, A. (author), Yoshida, M. (author), Han, W. (author), Lin, H.X. (author)
Aerosol optical depths (AODs) from the new Himawari-8 satellite instrument have been assimilated in a dust simulation model over East Asia. This advanced geostationary instrument is capable of monitoring the East Asian dust storms which usually have great spatial and temporal variability. The quality of the data has been verified through a...
article 2019
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Fokker, P.A. (author), van Leijen, F.J. (author), Orlic, B. (author), van der Marel, H. (author), Hanssen, R.F. (author)
Ground surface dynamics is one of the processes influencing the future of the Wadden Sea area. Vertical land movement, both subsidence and heave, is a direct contributor to changes in the relative sea level. It is defined as the change of height of the Earth’s surface with respect to a vertical datum. In the Netherlands, the Normaal Amsterdams...
article 2018
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Nieuwenhuizen, R.P.J. (author), Kruithof, M. (author), Schutte, K. (author)
High resolution imagery is of crucial importance for the performance on visual recognition tasks. Super-resolution (SR) reconstruction algorithms aim to enhance the image resolution beyond the capability of the image sensor being used. Traditional SR algorithms approach this inverse problem using physical models for the image formation combined...
conference paper 2017
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Lu, S. (author), Heemink, A. (author), Lin, H.X. (author), Segers, A. (author), Fu, G. (author)
Remote sensing, as a powerful tool for monitoring atmospheric phenomena, has been playing an increasingly important role in inverse modeling. Remote sensing instruments measure quantities that often combine several state variables as one. This creates very strong correlations between the state variables that share the same observation variable....
article 2017
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Oom, M. (author), Feru, E. (author), de Jager, B. (author), de Lange, R. (author), Ouwerkerk, H. (author)
conference paper 2017
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Carpentier, S.F.A. (author), Steeghs, T.P.H. (author), Zhang, Y. (author), Leeuwenburgh, O. (author)
Recent progress in 4D seismic history matching benefits greatly from the use of 4D seismic timelapse data. Several methods for inversion of 4D seismic timelapse data for reservoir pressure and saturation have been developed with mixed success. Most of these methods work well on synthetic data or real data with low noise levels, but degrade in...
conference paper 2017
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Noack, B. (author), Sijs, J. (author), Reinhardt, M. (author), Hanebeck, U.D. (author)
In distributed and decentralized state estimation systems, fusion methods are employed to systematically combine multiple estimates of the state into a single, more accurate estimate. An often encountered problem in the fusion process relates to unknown common information that is shared by the estimates to be fused and is responsible for...
article 2017
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Kruiver, P.P. (author), van Dedem, E. (author), Romijn, R. (author), de Lange, G. (author), Korff, M. (author), Stafleu, J. (author), Gunnink, J.L. (author), Rodriguez-Marek, A. (author), Bommer, J.J. (author), van Elk, J. (author), Doornhof, D. (author)
A regional shear-wave velocity (VS) model has been developed for the Groningen gas field in the Netherlands as the basis for seismic microzonation of an area of more than 1000 km2. The VS model, extending to a depth of almost 1 km, is an essential input to the modelling of hazard and risk due to induced earthquakes in the region. The detailed VS...
article 2017
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Noack, B. (author), Sijs, J. (author), Hanebeck, U.D. (author)
Decentralized data fusion is a challenging task. Either it is too difficult to maintain and track the information required to perform fusion optimally, or too much information is discarded to obtain informative fusion results. A well-known solution is Covariance Intersection, which may provide too conservative fusion results. A less conservative...
conference paper 2017
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Smit, J. (author), van Wees, J.D. (author), Cloetingh, S. (author)
The crustal seismic velocity structure of northwestern Europe shows a low P-wave velocity zone (LVZ) in the lower crust along the Caledonian Thor suture zone (TSZ) that cannot be easily attributed to Avalonia or Baltica plates abutting the TSZ. The LVZ appears to correspond to a hitherto unrecognized crustal segment (accretionary complex) that...
article 2016
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Fokker, P.A. (author), van Thienen-Visser, K. (author)
Hydrocarbon extraction leads to compaction of the gas reservoir, which is visible on the surface as subsidence. Subsidence measurements therefore give information on the hydrocarbon extraction and can thus be used to better estimate uncertain reservoir parameters. Normally, optical height difference measurements are taken between benchmarks,...
article 2016
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Alexe, M. (author), Bergamaschi, P. (author), Segers, A. (author), Detmers, R. (author), Butz, A. (author), Hasekamp, O. (author), Guerlet, S. (author), Parker, R. (author), Boesch, H. (author), Frankenberg, C. (author), Scheepmaker, R.A. (author), Dlugokencky, E. (author), Sweeney, C. (author), Wofsy, S.C. (author), Kort, E.A. (author)
At the beginning of 2009 new space-borne observations of dry-air column-averaged mole fractions of atmospheric methane (XCH4) became available from the Thermal And Near infrared Sensor for carbon Observations-Fourier Transform Spectrometer (TANSO-FTS) instrument on board the Greenhouse Gases Observing SATellite (GOSAT). Until April 2012...
article 2015
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Fokker, P.A. (author), Visser, J. (author)
We report a field study on solution mining of magnesium chloride from bischofite layers in the Netherlands at depths between 1500 and 1850 m. Subsidence that was observed in the area is due to part of the brine production being realized by cavern squeeze; some of which were connccted. Wc used an earlier developed inversion scheme to quantify the...
conference paper 2014
Searched for: subject:"Inversion"
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