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Tonnaer, R. (author), Shroff, S. (author), Groves, R.M. (author)The strict quality requirements for aerospace composite struc- tures give rise to costly quality control procedures. In automated bre placement (AFP) these procedures rely heavily on manual work and inspection. This research aims at performing preventative non-destructive evaluation of composite laminate quality based on an online geometric...abstract 2016
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- Qian, QK (author) abstract 2016
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Casas, Augusto (author), Draganov, D.S. (author), Olivera Craig, Victoria Hipatia (author), Manassero, Maria Constanza (author), Badi, Gabriela (author), Franco, Luis (author), Ruigrok, E.N. (author), Gomez, Martin (author)Seismic interferometry (SI) retrieves virtual seismic signals from measurements at two receivers from surrounding sources. Studies have demonstrated that SI can image subsurface reflectivity. Claerbout (1968) showed that the reflection response can be obtained by autocorrelating the transmission response assuming a 1-D acoustic medium. Migration...abstract 2016
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Casas, Augusto (author), Draganov, D.S. (author), Olivera Craig, Victoria Hipatia (author), Manassero, Maria Constanza (author), Badi, Gabriela (author), Franco, L (author), Gomez, Martin (author), Ruigrok, E.N. (author)Seismic interferometry (SI) studies the interference phenomenon between pairs of signals in order to obtain information from the differences between them. SI is now regularly used in exploration and global seismology with active and/or passive sources, i.e., artificial sources (dynamite, vibroseis, sledge hammer, etc.) or natural sources ...abstract 2016
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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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Weemstra, C. (author), Draganov, D.S. (author), Ruigrok, E.N. (author), Hunziker, J.W. (author), gomez, Martin (author), Wapenaar, C.P.A. (author)Obtaining new seismic responses from existing recordings is generally referred to as seismic interferometry (SI). Conventionally, these seismic interferometric responses are retrieved by simple crosscorrelation of recordings made<br/>by separate receivers: a first receiver acts as a 'virtual source' whose response is retrieved at the other...abstract 2016
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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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- Verschuure, G.A (author) abstract 2016
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- Clarke, Nicholas (author) abstract 2016
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- Sanaan Bensi, N. (author) abstract 2016
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Valks, B. (author), Arkesteijn, M.H. (author), den Heijer, A.C. (author)One of the long-standing issues in the field of corporate real estate management is the alignment of an organisation’s real estate to its corporate strategy. Despite extensive research, existing approaches have not had much uptake in practice and fall short in a number of aspects (H 2011). The hypothesis in this paper is that indoor positioning...abstract 2016
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Laumann, S.J. (author), Zhou, Jianchao (author), Heimovaara, T.J. (author)The utilization of natural processes for engineering purposes has been widely discussed in recent years since they might enable the development of cost-effective, robust and environmentally compatible engineering technologies. Biomineralization is one of the many possible biogeochemical processes that is currently investigated in detail. We...abstract 2016
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van Nooijen, R.R.P. (author), Kolechkina, A.G. (author)The problem of smoothing dry weather inflow variations for<br/>a Waste Water Treatment Plant (WWTP) that receives sewage from<br/>multiple mixed sewer systems is presented, together with a first rough<br/>solution algorithm. A simplification followed by a naive translation into<br/>a zero-one linear programming problem results in 1152...abstract 2016
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van Nooijen, R.R.P. (author), Kolechkina, A.G. (author)In [1,2] Kulisch defines (ordered) ringoids and vectoids to provide a theoretical basis for computer arithmetic and interval arithmetic. One interesting aspect of his treatment is the search for necessary and sufficient conditions for a meaningful notion of negation and zero. In this paper we consider this both from the point of view of...abstract 2016
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Ochôa, Pedro (author), Villegas, I.F. (author), Groves, R.M. (author), Benedictus, R. (author)Ultrasonic welding is a very promising technique for joining thermoplastic composite (TpC) components in aircraft primary structures [1, 2]. The potential introduction of new lightweight structures in civil aviation has been driving the change towards condition-based maintenance (CBM) as an alternative to the regular inspection interval approach...abstract 2016
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Groves, R.M. (author)Safe and cost effective operation are the highest priorities for civil aircraft. Considering that many events that can occur during normal aircraft operation which cause a reduction in the residual strength of the structure, a rigid adherence to inspection and maintenance schedules and timely repair of damage is required. Since Structural Health...abstract 2016
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Houtgast, E.J. (author), Sima, V.M. (author), Bertels, K.L.M. (author), Al-Ars, Z. (author)We are rapidly entering the era of genomics. The dramatic cost reduction of DNA sequencing due to the introduction of Next Generation Sequencing (NGS) techniques has resulted in an exponential growth of genetics data. The amount of data generated, and its associated processing into useful information, poses serious computational challenges. Here...abstract 2016
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Weemstra, C. (author), Obermann, Anne (author), Blanck, Hanna (author), Verdel, Arie (author), Paap, B (author), Guðnason, Egill Árni (author), Hersir, Gylfi Páll (author), Jousset, Philippe (author), Sigurðsson, Ömar (author)We report on the results obtained from a dense seismic deployment over a geothermal reservoir. The reservoir has been producing continuously for almost a decade and is located on the tip of the Reykjanes peninsula, SW Iceland. The seismic stations on top of the reservoir have continuously recorded the ambient seismic wavefield between April 2014...abstract 2016
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Weemstra, C. (author), Obermann, Anne (author), Verdel, Arie (author), Paap, B (author), Blanck, Hanna (author), Guðnason, Egill Árni (author), Hersir, Gylfi Páll (author), Jousset, Philippe (author), Sigurðsson, Ömar (author)We report on the results obtained from a dense seismic deployment over a geothermal reservoir located on the tip of the Reykjanes peninsula, SW Iceland. The available seismic stations have continuously recorded the ambient-seismic wave field between April 2014 and August 2015. Using seismic interferometry (SI), seismic responses were generated...abstract 2016
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Geevers, Sjoerd (author), van der Vegt, Jaap (author), Mulder, W.A. (author)We present and analyse a Symmetric Interior Penalty Discontinuous Galerkin (SIPDG) method combined with an explicit hybrid Local Time Stepping (LTS) scheme for solving seismic wave problems in heterogeneous anisotropic elastic media. The discontinuous Galerkin method allows for local adjustment of the mesh size and approximation order, and can...abstract 2016