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Capacitively coupled EM sensors integrated in non-corrosive casings for longterm CSEM monitoring

Drijkoningen, G.G. (author), Ravilov, M. (author), Heller, H.K.J. (author), van Beek, C. (author)

We present a development of capacitively coupled EM sensors integrated in non-corrosive casings for permanent CSEM monitoring in boreholes. Capacitive sensors are required to detect low-frequency (diffusive-field) signals where voltage measurements fail and ammeters need to be used. The permanent installation in boreholes necessitates surface...

conference paper 2024

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Charging after Lockdown: The Aftermath of COVID-19 Policies on Electric Vehicle Charging Behaviour in The Netherlands

van der Koogh, M.L. (author), Wolbertus, Rick (author), Heller, Renée (author)

During the COVID-19—related lockdowns (2020–2022), mobility patterns and charging needs were substantially affected. Policies such as work from home, lockdowns, and curfews reduced traffic and commuting significantly. This global pandemic may have also substantially changed mobility patterns on the long term and therefore the need for electric...

journal article 2023

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A conceptual representation of short-term and long-term decision-making in the roll-out and exploitation of public EV charging infrastructure in Dutch neighborhoods

van der Koogh, M.L. (author), Chappin, E.J.L. (author), Heller, Renee (author), Lukszo, Z. (author)

Charging infrastructure in neighborhoods is essential for inhabitants who use electric vehicles. The development of public charging infrastructure can be complex because of its dependency on local grid conditions, the responsibility to prepare for anticipated fleet growth policies, and the implicit biases that may occur with the allocation of...

journal article 2023

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Stakeholder prioritizations for electric vehicle charging across time periods

van der Koogh, M.L. (author), Chappin, E.J.L. (author), Heller, Reneé (author), Lukszo, Z. (author)

Electric vehicles have penetrated the Dutch market, which increases the potential for decreased local emissions, the use and storage of sustainable energy, and the roll-out and use of electric car-sharing business models. This development also raises new potential issues such as increased electricity demand, a lack of social acceptance, and...

journal article 2023

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Estimating P-and S-Wave Velocities in Fluid Mud Using Seismic Interferometry

Ma, X. (author), Kirichek, Alex (author), Heller, H.K.J. (author), Draganov, D.S. (author)

Fluid mud plays an important role in navigability in ports and waterways. Characterizing and monitoring the seismic properties of the fluid mud can help understand its geotechnical behavior. Estimation of the wave velocities in fluid mud with high accuracy and repeatability enables investigating the behavior of parameters like the yield stress...

journal article 2022

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Stakeholder prioritizations for electric vehicle charging across time periods

van der Koogh, M.L. (author), Chappin, E.J.L. (author), Heller, R. (author), Lukszo, Z. (author)

abstract 2022

document

A Radar-Oriented Approach to the Normal Distributions Transform

Heller, Martijn (author), Petrov, N. (author), Yarovoy, Alexander (author)

A modification of the scan-matching technique known as the Normal Distributions Transform to be applicable to radar data is presented. The proposed modification uses the measurements of received signal power to account for possible radar cross-section (RCS) fluctuation of the scene, which is prone to cause missed detections, undesirable in scan...

conference paper 2022

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Icing wind tunnel measurements of supercooled large droplets using the 12 mm total water content cone of the Nevzorov probe

Lucke, J.R. (author), Jurkat-Witschas, Tina (author), Heller, Romy (author), Hahn, Valerian (author), Hamman, Matthew (author), Breitfuss, Wolfgang (author), Reddy Bora, Venkateshwar (author), Moser, Manuel (author), Voigt, Christiane (author)

Supercooled large droplet (SLD) icing can occur behind the protected surfaces of an aircraft and create severe aerodynamic disturbances, which represent a safety hazard for aviation. Liquid water content (LWC) measurements in icing conditions that contain SLDs require instruments that are able to sample unimodal and bimodal droplet size...

journal article 2022

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Ultrasonic experiments for retrieval of layer-specific reflections inside fluid mud from ports with seismic interferometry

Draganov, D.S. (author), Ma, X. (author), Heller, H.K.J. (author), Kirichek, Alex (author)

Knowledge about the characteristics of fluid mud in ports and waterways would allow safer navigating through fluid mud. The properties of the fluid mud determine the feasibility of navigating vessels through the fluid mud. Seismic waves have the potential to help characterize the fluid-mud layers, especially when both P- and S-waves are used....

conference paper 2022

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Non-Intrusive Characterization and Monitoring of Fluid Mud: Laboratory Experiments with Seismic Techniques, Distributed Acoustic Sensing (DAS), and Distributed Temperature Sensing (DTS)

Draganov, D.S. (author), Ma, X. (author), Buisman, M. (author), Kiers, Tjeerd (author), Heller, H.K.J. (author), Kirichek, Alex (author)

In ports and waterways, the bathymetry is regularly surveyed for updating navigation charts ensuring safe transport. In port areas with fluid-mud layers, most traditional surveying techniques are accurate but are intrusive and provide one-dimensional measurements limiting their application. Current non-intrusive surveying techniques are less...

book chapter 2021

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Laboratory seismic measurements for layer-specific description of fluid mud and for linking seismic velocities to rheological properties

Ma, X. (author), Kirichek, Alex (author), Shakeel, A. (author), Heller, H.K.J. (author), Draganov, D.S. (author)

The velocities of the seismic waves propagating in the fluid-mud layer are governed by the rheological properties and density of the fluid mud. Performing seismic transmission measurements inside the fluid mud can give good estimates of the seismic velocities and, thus, of the rheological properties and density. Laboratory ultrasonic...

journal article 2021

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Are we satisfying the right conditions for the mobility transition? A review and evaluation of the dutch urban mobility policies

van der Koogh, M.L. (author), Chappin, E.J.L. (author), Heller, Renée (author), Lukszo, Z. (author)

Global climate agreements call for action and an integrated perspective on mobility, energy and overall consumption. Municipalities in dense, urban areas are challenged with facilitating this transition with limited space and energy resources, and with future uncertainties. One important aspect of the transition is the adoption of electric...

review 2021

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Oxyhydride Nature of Rare-Earth-Based Photochromic Thin Films

Cornelius, S. (author), Colombi, G. (author), Nafezarefi, F. (author), Schreuders, H. (author), Heller, R. (author), Munnik, Frans (author), Dam, B. (author)

Thin films of rare-earth (RE)-oxygen-hydrogen compounds prepared by reactive magnetron sputtering show a unique color-neutral photochromic effect at ambient conditions. While their optical properties have been studied extensively, the understanding of the relationship between photochromism, chemical composition, and structure is limited....

journal article 2019

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Large-scale experiments into the tsunamigenic potential of different iceberg calving mechanisms

Heller, Valentin (author), Chen, Fan (author), Brühl, Markus (author), Gabl, Roman (author), Chen, X. (author), Wolters, Guido (author), Fuchs, Helge (author)

Mass balance analysis of ice sheets is a key component to understand the effects of global warming. A significant component of ice sheet and shelf mass balance is iceberg calving, which can generate large tsunamis endangering human beings and coastal infrastructure. Such iceberg-tsunamis have reached amplitudes of 50 m and destroyed harbours....

journal article 2019

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High-Resolution Ultrasonic Imaging of Artworks with Seismic Interferometry for Their Conservation and Restoration

Draganov, D.S. (author), Hunziker, J.W. (author), Heller, H.K.J. (author), Gutkowski, Karin (author), Marte, Fernando (author)

Artworks are an inseparable part of the cultural heritage of societies and provide us with a unique look at cultural developments through time and space. For the best possible conservation, it is paramount to know the constituent materials, condition, and construction techniques of the objects (e.g. painting on wood, fresco, sculpture). Such...

journal article 2018

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Mitigating the Climate Impact from Aviation: Achievements and Results of the DLR WeCare Project

Grewe, V. (author), Dahlmann, K. (author), Flink, J. (author), Frömming, C. (author), Ghosh, R. (author), Gierens, K. (author), Heller, R (author), Hendricks, J. (author), Jockel, P. (author), Kaufmann, S. (author), Kölker, K. (author), Linke, F. (author), Luchkova, T. (author), Lührs, B. (author), van Manen, Jesper (author), Matthes, S (author), Minikin, A. (author), Niklaß, Malte (author), Plohr, M. (author), Righi, M. (author), Rosanka, S. (author), Schmitt, A (author), Schumann, U (author), Terekhov, I. (author), Unterstrasser, S. (author), Vázquez-Navarro, M. (author), Voigt, C. (author), Wicke, K. (author), Yamashita, H. (author), Zahn, A. (author), Ziereis, H. (author)

The WeCare project (Utilizing Weather information for Climate efficient and eco efficient future aviation), an internal project of the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt, DLR), aimed at finding solutions for reducing the climate impact of aviation based on an improved understanding of the atmospheric impact from...

journal article 2017

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Extraction of layer-specific seismic velocity in a porous medium through seismic interferometry applied to ultrasonic measurements of CO2 sequestration

Draganov, D.S. (author), Ghose, R. (author), Heller, H.K.J. (author)

Purpose: Time-lapse seismic monitoring constitutes the foundation for most monitoring programmes involving CO2 storage. When using time-lapse seismics, two major sources of uncertainty in the estimation of changes in the reservoir properties, like saturation and pressure, are the non-repeatability of the source positions and the difficulty to...

abstract 2016

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Seismic interferometry using ghost reflections applied to laboratory measurements for monitoring supercritical CO2 sequestration

Draganov, D.S. (author), Ghose, R. (author), Kirichek, Alex (author), Heller, H.K.J. (author)

The seismic method with active sources has proven to be a very valuable tool for CO2 sequestration monitoring. The seismic method can be used for extraction of reservoir quantities like saturation and pore pressure. But nonrepeatability in the positioning of the source and receiver during base and monitoring surveys can deteriorate the accuracy...

abstract 2016

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Laboratory monitoring of CO2 migration within brine-saturated reservoir rock though complex electrical impedance

Kirichek, O. (author), Ghose, R. (author), Heller, H.K.J. (author)

We investigate the ability of complex electrical measurements to monitor the CO2 front propagation within brine-saturated reservoir rock. A laboratory facility has been developed to perform CO2-brine substitution experiments under reservoir conditions. In the present study, CO2 is injected into a brine-saturated core while the complex electrical...

journal article 2013

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Monitoring CO2 storage using seismic-interferometry ghost reflections

Draganov, D.S. (author), Heller, H.K.J. (author), Ghose, R. (author)

Time-lapse seismic monitoring is a fundamental part in most monitoring programmes involving CO2 storage. Even though the seismic method has proven its applicability for monitoring, there are two major causes of uncertainty in the estimation of changes in the reservoir properties: non-repeatability of the source positions and the difficulty in...

conference paper 2013