Searched for: subject:"Monitoring"
(1 - 20 of 28)

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Wessels, J.F.M. (author), van der Mark, P.J. (author), Bektas, K.E. (author), Bakker, J. (author), van der Voort, M. (author)
Transportation infrastructure assets are designed to meet pre-specified reliability, availability, maintainability and safety (RAMS) requirements. Electrical and mechanical components are critical elements with respect to the RAMS-criteria. Unplanned failure of these components lead to societal impact, unsafe situations or costs. The trend in...
conference paper 2019
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Duyzer, J. (author), van den Hout, D. (author), Zandveld, P. (author), van Ratingen, S. (author)
The suitability of European networks to check compliance with air quality standards and to assess exposure of the population was investigated. An air quality model (URBIS) was applied to estimate and compare the spatial distribution of the concentration of nitrogen dioxide (NO2) in ambient air in four large cities. The concentrations calculated...
article 2015
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Bergamaschi, P. (author), Corazza, M. (author), Karstens, U. (author), Athanassiadou, M. (author), Thompson, R.L. (author), Pison, I. (author), Manning, A.J. (author), Bousquet, P. (author), Segers, A. (author), Vermeulen, A.T. (author), Janssens-Maenhout, G. (author), Schmidt, M. (author), Ramonet, M. (author), Meinhardt, F. (author), Aalto, T. (author), Haszpra, L. (author), Moncrieff, J. (author), Popa, M.E. (author), Lowry, D. (author), Steinbacher, M. (author), Jordan, A. (author), O'Doherty, S. (author), Piacentino, S. (author), Dlugokencky, E. (author)
European CH4 and N2O emissions are estimated for 2006 and 2007 using four inverse modelling systems, based on different global and regional Eulerian and Lagrangian transport models. This ensemble approach is designed to provide more realistic estimates of the overall uncertainties in the derived emissions, which is particularly important for...
article 2015
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Curier, R.L. (author), Kranenburg, R. (author), Segers, A.J.S. (author), Timmermans, R.M.A. (author), Schaap, M. (author)
In this study trends in the tropospheric NO2 concentrations during 2005-2010 across Europe were derived from the synergistic use of OMI NO2 tropospheric columns and the chemistry transport model LOTOS-EUROS and were compared to reported NOx emissions. The chemistry transport model captures a large fraction of the variability in NO2 columns at a...
article 2014
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Basten, T.G.H. (author), Wessels, P.W. (author)
The last decade has shown a growing number and wide variety of systems for monitoring environmental noise. This ongoing development is made possible by the availability of cheaper and smaller hardware and innovations in communication networks. The developments are fed by a growing interest in monitoring because it can help in improving noise...
conference paper 2014
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Pahlavan, P.L. (author), Paulissen, J.H. (author), Pijpers, R.J.M. (author), Hakkesteegt, H.C. (author), Jansen, T.H. (author)
Despite extensive developments in the field of Acoustic Emission (AE) for monitoring fatigue cracks in steel structures, the implementation of AE systems for large-scale bridges is hindered by limitations associated with instrumentation costs and signal processing complexities. This paper sheds light on some of the most important challenges in...
conference paper 2014
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Trichias, K. (author), Pijpers, R.J.M. (author), Meeuwissen, H.B. (author)
Structural Health Monitoring (SHM) systems help to monitor critical infrastructures (bridges, tunnels, etc.) remotely and provide up-to-date information about their physical condition. In addition, it helps to predict the structure’s life and required maintenance in a cost-efficient way. Typically, inspection data gives insight in the structural...
conference paper 2014
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Basten, T.G.H. (author), Wessels, P.W. (author)
Acoustic monitoring using a sensor network is a powerful instrument to assess and manage complex noise situations. It can provide a basis to identify appropriate and cost effective measures, and to assess their effect by comparing before and after implementation. It can also be an instrument for communication and policy making. However, the...
conference paper 2013
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Schweckendiek, T. (author), Vrouwenvelder, A.C.W.M. (author)
Flood defence levees are crucial for flood protection, especially in riverine and deltaic areas. One of the most critical failure modes of levees is backwards internal erosion or piping. Piping reliability is largely influenced by uncertainties in ground conditions, especially by geohydrological properties such as the hydraulic conductivity of...
article 2013
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van der Ronald, A. (author), Timmermans, R. (author), Bai, J. (author), Zhang, Q. (author), van der Wal, L. (author)
In this paper we will present the FP7-project 'MarcoPolo'. The main objective of MarcoPolo is to improve air quality monitoring, modelling and forecasting over China using satellite data. During the project a new emission inventory will be constructed by combining Chinese and European expertise. It will be based on recent satellite data and GIS...
conference paper 2013
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Wessels, P.W. (author), van Zon, A.T. (author), Basten, T.G.H. (author)
Recent developments in acoustic monitoring systems make it possible to measure complex noise situations, like urban traffic noise, continuously. Monitoring provides more insight in the noise situation, from which more specific and (cost) effective measures can be taken. Monitoring also allows direct evaluation of the effect of mitigation, or to...
conference paper 2013
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van der Gon, H.D. (author), Visschedijk, A. (author), McLinden, C. (author), Fioletov, V. (author), van der Wal, L. (author)
European SO2 emissions from large points sources (LPS) were cross-checked with satellite S2 measurements from the Ozone Monitoring Instrument (OMI) on NASA's EOS-Aura satellite, averaged over a period of several years. Coordinates of the top-100 individual LPS in Europe were taken from the TNO point source database and corresponding OMI S2 plots...
conference paper 2013
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van der Eerden, F.J.M. (author), Graafland, F. (author), Wessels, P.W. (author), Basten, T.G.H. (author)
A model based monitoring system is applied on a local scale in an urban area to obtain a better understanding of the traffic noise situation. The system consists of a scalable sensor network and an engineering model. A better understanding is needed to take appropriate and cost efficient measures, especially when changes to the local...
conference paper 2013
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Pijpers, R.J.M. (author), Pahlavan, P.L. (author), Paulissen, J.H. (author), Hakkesteegt, H.C. (author), Jansen, T.H. (author)
Infrastructure asset owners are more and more confronted with structures reaching the end of their structural life. Structural Health Monitoring (SHM) systems should provide up-to-date information about the actual condition, as well predict the structural life and required maintenance of the assets for more cost effective and reliable operation...
conference paper 2013
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Zouch, M. (author), Courage, W. (author), Nápoles, O.M. (author)
We present a framework to investigate new monitoring techniques for infrastructures and assess their potential value for the network management. This framework is based on a social cost benefit analysis tool that aims to (i) assist decision makers in selecting and developing cost-effective new monitoring techniques and (ii) provide managers with...
article 2013
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Zuada Coelho, B.A. (author), Vervuurt, A.H.J.M. (author), Peelen, W.H.A. (author), Leendertz, J.S. (author)
Modular expansion joints are structures that are submitted to severe fatigue load conditions. This may lead to unexpected premature damage of the structure which, besides the economic cost of repair, may limit the regular service of the bridge. To better understand the dynamic behaviour of modular expansion joints, different over rolling tests...
article 2013
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Peelen, W.H.A. (author), Neeft, E.A.C. (author), Leegwater, G. (author), van Kanten-Roos, W. (author), Courage, W.M.G. (author)
Steel is discarded by railway owners as a material for underground structures near railway lines, due to uncertainty over increased corrosion by DC stray currents stemming from the traction power system. This paper presents a large scale field test in which stray currents interference of a sheet pile wall was monitored in realistic conditions....
conference paper 2012
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Basten, T.G.H. (author), Wessels, P.W. (author), van der Eerden, F.J.M. (author)
A good understanding of the acoustic environment due to traffic in urban areas is very important. Long term monitoring within large areas provides a clear insight in the actual noise situation. This is needed to take appropriate and cost efficient measures; to asses the effect of measures by comparing before and after implementation and to have...
conference paper 2012
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Peelen, W.H.A. (author), Vervuurt, A.H.J.M. (author), Zuada Coelho, B.A. (author), Leendertz, H. (author)
One of the existing modular expansion joints of the Martinus Nijhoff Bridge in the Netherlands was monitored with the purpose of extending its service life for on year until replacement in 2011. Based on an analyses of the failure mechanisms of this (type of) joint, strain gauges were used as sensors and applied at centre and crossbeams. Chosen...
public lecture 2012
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Basten, T.G.H. (author), Schiphorst, F.B.A. (author)
Advanced maintenance strategies for infrastructure assets such as bridges or off shore wind turbines require actual and reliable information of the maintenance status. Structural health monitoring based on vibration sensing can help in supplying the input needed for structural health monitoring applications. However, large structures require a...
conference paper 2012
Searched for: subject:"Monitoring"
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