Towards adapting reverse vertical seismic profiling for ambient-noise imaging with transient sources: Automatic estimation of stationary-phase receivers for improved retrieval of the interferometric Green's function

Most of the ambient-noise studies are performed with sensor arrays located at the surface. Passive recordings containing seismic arrivals from subsurface sources could be seen as having a geometry resembling reverse vertical seismic profiling (RVSP). In such scenarios, the intersource seismic-interferometry technique can be used to redatum...

Robust estimation of primaries by sparse inversion and Marchenko equation-based workflow for multiple suppression in the case of a shallow water layer and a complex overburden: A 2D case study in the Arabian Gulf

Suppression of surface-related and internal multiples is an outstanding challenge in seismic data processing. The former is particularly difficult in shallow water, whereas the latter is problematic for targets buried under complex, highly scattering overburdens. We have developed a two-step, amplitude- and phase-preserving, inversion-based...

Elimination of multiples from acoustic reflection data

Elimination of multiples from acoustic reflection data is important to reduce the effect of their presence in velocity model building and subsequent imaging. Many processing schemes assume only primary reflection events are present in the data. Free-surface multiple elimination is an established technology, but internal multiple elimination is...

Fast nonrecursive 1D inversion by filtering acoustic-reflection data

We derive a fast acoustic inversion method for a piecewise homogeneous horizontally layered medium. The method obtains medium parameters from the reflection response. The method can be implemented to obtain the parameters on either side of a reflector at an arbitrary depth. Three processing steps lead to the inversion result. First, we solve a...

Parallel Approach to Derivative-Free Optimization: Implementing the DONE Algorithm on a GPU

Researchers at Delft University of Technology have recently developed an algorithm for optimizing noisy, expensive and possibly nonconvex objective functions for which no derivatives are available. The data-based online nonlinear extremum-seeker (DONE) was originally developed for sensorless wavefront aberration correction in optical coherence...

A design of a mobile bio processor which harnesses black soldier flies and tiger worms to process human feces

This report guided reader though the research the leads to development of a mobile bioprocessing installation for human feces. It starts off with literature research on the why and how a bio processing can aid in improving sanitation for people in developing countries and solve both the health and environmental issues that are a consequence of...

Characterization of a heterogeneous landfill using seismic and electrical resistivity data

Understanding the processes occurring inside a landfill is important for improving the treatment of landfills. Irrigation and recirculation of leachate are widely used in landfill treatments. Increasing the efficiency of such treatments requires a detailed understanding of the flow inside the landfill. The flow depends largely on the...

Cell Concentration Sensor for Micro-Bioreactors: Software & Data Processing

This thesis was written for the bachelor’s final project, of the study Electrical Engineering. It describes the design of a cell concentration sensor. A proof of concept was designed which is able tomeasure the cell concentration of yeast in a suspension by using sensors which measure the impedance and optical properties of the suspension. The...

The road ahead in seismic processing

The next generation seismic processing system will comprise a chain of unified algorithms, from preprocessing to reservoir characterization. All these algorithms are formulated in terms of a closed-loop estimation problem, showing a great similarity with each other. A critical module in each algorithm is forward modeling, allowing feedback...

Dispersive multi-modal mud-roll elimination using feedback-loop approach

In a shallow water environment, mud-rolls are often dominant and appear as a prevailing coherent noise in OBC seismic data. Their complex properties make the noise elimination notably challenging in seismic processing. To address these challenges, we propose a dispersive multimodal mud-roll elimination method using a feedback-loop approach with...

Effect of noise in blending and deblending

If simultaneous shooting is carried out by incoherent source arrays, being the condition of blended acquisition, the deblending process generates shot records with a very low residual interference (blending noise). We found, theoretically and numerically, that deblended shot records had a better background-related signal-to-noise ratio than shot...

Flexible supramolecular matrix based self-healing composites

Supramolecular polymers gained a great success in the last years as self-healing materials and many different systems have been developed. These polymers combine the advantages of intrinsic and autonomic self-healing systems. In 2010, Montarnal et al. developed a class of epoxy-based hybrid networks that combine both chemical and supramolecular...

Deblending of seismic data

Seismic imaging is one of the most common geophysical techniques for hydrocarbon exploration. Seismic acquisition is a trade-off between economy and quality. In conventional acquisition, the time intervals between successively firing sources are large enough to avoid interference in time. To obtain an efficient survey, the spatial source...

Smart Processing of Brass Smelter Residues

In this study a industrial survey was performed on the secondary products generated in the Dutch metal industry. From this industrial survey it was concluded that the Dutch metal industry is already far ahead with closing the materials cycle as for almost every product is a processing route to recover its metal content. The residues generated at...

Prototyping of a Stretchable Microelectrode Array for Cardiotoxicity Drug Screening

Cardiotoxicity is a common side-effect of drugs and a major cause of late-stage drug rejections, costing the pharmaceutical companies massive amounts of money. A drug is cardiotoxic when it has a negative influence on the heart. Often, it changes the electrophysiological characteristics of the heart, resulting in arrhythmia. This can have...

Processing and recognition of handwriting in multimedia environments

Supervised boundary formation