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Kramer, O.J.I. (author), El Hasadi, Yousef M.F. (author), de Moel, P.J. (author), Baars, Eric T. (author), Padding, J.T. (author), van der Hoek, J.P. (author)
For an accurate prediction of the porosity of a liquid-solid homogenous fluidized bed, various empirical prediction models have been developed. Symbolic regression machine learning techniques are suitable for analyzing experimental fluidization data to produce empirical expressions for porosity as a function not only of fluid velocity and...
conference paper 2019
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Shen, Y. (author), Lindenbergh, R.C. (author), Hofland, B. (author), Kramer, R. (author)
For better understanding how coastal structures with gentle slopes behave during high energy events, a wave attack experiment representing a storm of 3000 waves was performed in a flume facility. Two setups with different steepness of slope were compared under the same conditions. In order to quantify changes in the rock slopes after the wave...
conference paper 2017
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Kramer, O.J.I. (author), de Moel, P.J. (author), Baars, E.T. (author), van Vugt, W.H. (author), van der Hoek, J.P. (author)
Natural particles are frequently applied in drinking water treatment in up-flow fluidisation processes. Additionally, sedimentation processes are applied to clarify water and to concentrate solids. To estimate the terminal settling velocity of single solid particles in a liquid system, a comprehensive collection of equations is available. For...
conference paper 2017
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Kramer, O.J.I. (author), de Moel, P.J. (author), Baars, E.T. (author), van Vugt, W.H. (author), van der Hoek, J.P. (author)
The literature provides a comprehensive collection of equations to estimate the<br/>terminal settling velocity of single solid particles in a liquid system. The settling velocity for perfectly round spheres can accurately be calculated. In the contrary for natural imperfect particles the experimentally measured settling velocity deviates...
conference paper 2017
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Stoop, A.H. (author), Bakker, T.W. (author), Kramer, H.J.M. (author)
In several studies the beneficial influence of pre-treatment of waste activated sludge with cavitation on the biogas production was demonstrated. It is however, still not fully certain whether this effect should be mainly contributed to an increase in conversion rate of organics into biogas by anaerobic bacteria, and how much cavitation...
conference paper 2015
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Kramer, O. (author), Jobse, M.A. (author), Baars, E.T. (author), van der Helm, A.W.C. (author), Colin, M.G. (author), Kors, L.J. (author), van Vugt, W.H. (author)
Softening at drinking water treatment plants is often realised by fluidised bed pellet reactors. Generally, sand is used as seeding material and pellets are produced as a by-product. To improve to sustainability, research has been carried out to replace the seeding material by re-using grained and sieved calcite pellets as seeding material. An...
conference paper 2015
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Van der Helm, A.W.C. (author), Kramer, O.J.I. (author), Hooft, J.F.M. (author), De Moel, P.J. (author)
In practice, drinking water technologists use simplified calculation methods for aquatic chemistry calculations. Recently, the database stimela.dat is developed especially for aquatic chemistry for drinking water treatment processes. The database is used in PHREEQC, the standard in geohydrology for calculating chemical equilibria in groundwater....
conference paper 2015
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Hofs, B (author), Baars, ET (author), Palmen, LJ (author), Elings, JA (author), Kors, L.J. (author), Kramer, O.J.I. (author), Koppers, H (author), van der Hoek, J.P. (author)
About 50% of the drinking water in the Netherlands is centrally softened by the drinking water companies in a process known as pellet softening. In this process a base and seeding material are mixed in an upflow reactor, where subsequently CaCO3 precipitates on a seed core as pellets. The seeding material is usually sand, but recently CaCO3 was...
conference paper 2015
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Viré, A. (author), Spinneken, J. (author), Piggott, M.D. (author), Pain, C.C. (author), Kramer, S.C. (author)
The aim of this study is to validate a fully non-linear finite-element model to simulate waves and wave-structure interactions. The Navier–Stokes equations are solved on an extended domain, which covers both fluid and structure. The latter is represented by a non-zero solid-concentration field, which is computed by conservatively mapping a mesh...
conference paper 2014
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Sadeghian Marnani, H. (author), Herfst, R.W. (author), Van den Dool, T.C. (author), Crowcombe, W.E. (author), Winters, J. (author), Kramer, G.F.I.J. (author)
Scanning probe microscopy (SPM) is a promising candidate for accurate assessment of metrology and defects on wafers and masks, however it has traditionally been too slow for high-throughput applications, although recent developments have significantly pushed the speed of SPM [1,2]. In this paper we present new results obtained with our...
conference paper 2014
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Sadeghian Marnani, H. (author), Van den Dool, T.C. (author), Crowcombe, W.E. (author), Herfst, R.W. (author), Winters, J. (author), Kramer, G.F.I.J. (author), Koster, N.B. (author)
With the device dimensions moving towards the 1X node, the semiconductor industry is rapidly approaching the point where 10 nm defects become critical. Therefore, new methods for improving the yield are emerging, including inspection and review methods with sufficient resolution and throughput. Existing industrial tools cannot anymore fulfill...
conference paper 2014
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Moorkamp, M. (author), Kramer, E.H. (author), Van Gulijk, C. (author), Ale, B.J.M. (author)
In this paper we present a conceptualization of safety management that is based on the cybernetic concepts of “controllability” and “control capacity”. In particular, we explore what this conceptualization means for safety management of the Dutch Army’s UAV unit that was part of Task Force Uruzgan (TFU) in the years 2006–2007 and 2008–2009. In...
conference paper 2013
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Young, Yin Lu (author), Savander, Brant R. (author), Kramer, Matthew R. (author)
conference paper 2011
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Kramer, B. (author), Elsinga, M. (author)
Parallelsessie II. E. De waarde van Koopgarant
conference paper 2010
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Kramer, B. (author)
Papers workshops. In recent years, Dutch housing associations have introduced a number of innovative types of sale, having in common that a house is sold to the tenant at a discount. In this way, buying a house becomes affordable for lower-income households. On the other hand the housing association obtains cash, which can be used for (social)...
conference paper 2008
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