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Van Turnhout, A.G. (author), Kleerebezem, R. (author), Heimovaara, T.J. (author)
In this study, we aim to validate the reaction network with an idealized experiment. We want to show that 1) rate controlling parameters are identifiable from the measured data by inverse modeling, and 2) that this network is able to predict the measured emissions in the experiment given the initial conditions. In the experiment, cabbage is used...
conference paper 2015
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Zhou, J. (author), Van Turnhout, A.G. (author), Heimovaara, T.J. (author), Afanasyev, M. (author)
The spatial and temporal distribution of precipitated minerals is one of the key factors governing various processes in the sub-surface environment, including microbially influenced corrosion (MIC) (Huang, 2002), bio-cementation (van Paassen et al., 2010) and sediment diagenesis (Paraska et al., 2014). The mineral precipitation not only affects...
conference paper 2015
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Van Turnhout, A.G. (author), Brandstatter, C. (author), Kleerebezem, R. (author), Heimovaara, T.J. (author)
The aim of our study is to investigate previously mentioned aspects with scenario analyses via a mechanistic biogeochemical reaction network model that contains the emission controlling reactions. In order to find such a network, we apply the gray modeling toolbox developed by van Turnhout et al. (2015) on a measured dataset used in the study of...
conference paper 2015
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Heimovaara, T.J. (author), Bun, A. (author), Van Turnhout, A.G. (author)
In order to develop novel approaches for reducing the after-care of Municipal Solid Waste (MSW) sanitary landfills methods are required with which we can quantify the emission potential present in waste bodies. Currently full-scale experiments are being prepared at three Dutch landfills based on enhanced infiltration by irrigation and leachate...
conference paper 2015
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Van Turnhout, A.G. (author), Heimovaara, T.J. (author), Kleerebezem, R. (author)
conference paper 2014
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Van Turnhout, A.G. (author), Heimovaara, T.J. (author), Kleerebezem, R. (author)
In this paper we present an approach to describe organic degradation within immobile water regions of Municipal Solid Waste (MSW) landfills which is best described by the term “gray box” model. We use a simplified set of dominant (bio)chemical and physical reactions and realistic environmental conditions. All equations, relationships and...
conference paper 2013
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Van Turnhout, A.G. (author), Heimovaara, T.J. (author), Kleerebezem, R. (author)
conference paper 2013
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Van Turnhout, A.G. (author), Heimovaara, T.J. (author), Kleerebezem, R. (author)
The main focus of this paper is the assessment of landfill leachate/gas emissions and longterm prediction of these emissions. Due to variation in environmental conditions, like rainfall events, leachate concentrations are very dynamic on a short-time scale. The measured concentrations in the leachate oscillate between maximum and minimum...
conference paper 2012
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Van Turnhout, A.G. (author), Heimovaara, T.J. (author), Kleerebezem, R. (author)
conference paper 2012
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Van Turnhout, A.G. (author), Kleerebezem, R. (author), Heimovaara, T.J. (author)
journal article 2012
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Van Turnhout, A.G. (author), Heimovaara, T.J. (author), Kleerebezem, R. (author)
Poster
conference paper 2012
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Van Grol, P. (author), Bociort, F. (author), Van Turnhout, M. (author)
Contrary to the frequent tacit assumption that the local minima of a merit function are points scattered more or less randomly over the design landscape, we have found that, at least for simple imaging systems (doublets with three and triplets with five variables) all design shapes we have observed thus far form a strictly ordered set of points,...
conference paper 2009
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Bociort, F. (author), Van Turnhout, M. (author)
journal article 2009
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Van Turnhout, M. (author)
A major problem in optical system design is that the optical merit function landscape is usually very complicated, especially for complex design problems where many minima are present. Finding good new local minima is then a difficult task. We show however that a certain degree of order is present in the optical design space, which is best...
doctoral thesis 2009
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Van Turnhout, M. (author), Bociort, F. (author)
In lens design, damped least-squares methods are typically used to find the nearest local minimum to a starting configuration in the merit function landscape. In this paper, we explore the use of such a method for a purpose that goes beyond local optimization. The merit function barrier, which separates an unsatisfactory solution from a...
journal article 2009
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Van Turnhout, M. (author), Bociort, F. (author)
Many optical design programs use various forms of the damped least-squares method for local optimization. In this paper, we show that damped least-squares algorithms, with maximized computational speed, can create sensitivity with respect to changes in initial conditions. In such cases, starting points, which are very close to each other, lead...
journal article 2009
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Van Turnhout, M. (author), Bociort, F. (author)
Local optimization algorithms, when they are optimized only for speed, have in certain situations an unpredictable behavior: starting points very close to each other lead after optimization to different minima. In these cases, the sets of points, which, when chosen as starting points for local optimization, lead to the same minimum (the so...
conference paper 2007
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Bociort, F. (author), Van Turnhout, M. (author), Marinescu, O. (author)
Saddle-point construction (SPC) is a new method to insert lenses into an existing design. With SPC, by inserting and extracting lenses new system shapes can be obtained very rapidly, and we believe that, if added to the optical designer’s arsenal, this new tool can significantly increase design productivity in certain situations. Despite the...
conference paper 2007
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Bociort, F. (author), Van Turnhout, M. (author), Marinescu, O.E. (author)
Optimization of a projection system is performed to obtain a starting configuration that is at a local minimum of the merit function or simply a previously known minimum system is used as the starting configuration. A zero-thickness meniscus lens is inserted at a surface in the local minimum starting configuration with N surfaces to construct a...
patent 2007
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Plug, W.J. (author), Slob, E. (author), Van Turnhout, J. (author), Bruining, J. (author)
The relation between capillary pressure (Pc) and interfacial area has been investigated by measuring Pc and the electric permittivity at 100 kHz simultaneously as function of the water saturation, (Sw). Drainage and imbibition experiments have been conducted for sand-distilled water-gas (CO2/N2) systems. The main capillary cycles and the...
journal article 2007
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