Searched for: author%3A%22Van+de+Graaf%2C+A.%22
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Bezemer, C.P. (author), Zaidman, A.E. (author), Van der Hoeven, A. (author), Van de Graaf, A. (author), Wiertz, M. (author), Weijers, R. (author)
Preprint of paper published in: ICSM 2012 - Proceedings of the IEEE International Conference on Software Maintenance, 23-28 September 2012; doi:10.1109/ICSM.2012.6405319 The goal of performance maintenance is to improve the performance of a software system after delivery. As the performance of a system is often characterized by unexpected...
report 2012
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Van de Graaf, A. (author)
Road transport systems suffer from congested roads,environmental legislation, and the threat of pay-as-you-go systems. All grist to the mill as far as the railways are concerned.Unfortunately cargo transport by rail is not exactly renowned for its flexibility and reliability, and the quality offered for the price is not competitive enough for...
journal article 2006
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Van de Graaf, A. (author)
Lighter, stronger, and best of all, cheaper these are the basic requirements for the development of new high-tech aircraft construction materials. Following the success of the composite material GLARE, Delft University of Technology is again scoring with the development of a new composite material. Polymer technologists at the Department of...
journal article 2006
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Van de Graaf, A. (author)
A heart attack is usually caused by a build-up of fatty deposits in the coronary arteries. In many cases the patient will have noticed early warnings signs such as rapid exhaustion and shortness of breath. A cardiologist can now use an ultrasonic sensor to detect fatty deposits in the coronary arteries. With the heart pumping away as usual...
journal article 2005
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Van de Graaf, A. (author)
How the ancient Egyptians managed to raise a seven million tonne pyramid in a time span of only twenty years remains a mystery. Every now and then discussions flare up as to how exactly the pyramids at Giza in Egypt were constructed. How could they cut stone without the necessary chisels? How did they manage to drag 2.5 million blocks of stone,...
journal article 2005
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Van de Graaf, A. (author)
The high-efficiency central heating boiler is about to reach the limits of its potential, so innovative insulation and other energy efficiency solutions are required, even though energy consumption in the Netherlands per household has dropped by 70% since 1986. Now that houses and offices are being fitted with increasingly efficient winter coats...
journal article 2005
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Van de Graaf, A. (author)
Blood is said to be thicker than water, and it may come as a surprise to learn that red blood cells 8 micrometres across routinely manage to work their way through minute blood vessels no more than 5 micrometre in diameter. How they do so remains a mystery, but thanks to a noninvasive optical measuring technique for fluids developed by...
journal article 2004
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Van de Graaf, A. (author)
In addition to his many famous paintings, Rembrandt created hundreds of etchings and thousands of drawings.The question is, was the family heirloom print really made by the master himself? To check its provenance,an art expert will begin by looking at the style of the print. Next, he will check the structure of the paper.This contains the...
journal article 2003
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Van De Graaf, A. (author)
One of the unique selling points of the Corus steel mills at IJmuiden is the quality of the steel they produce. The lubrication used during the last production stage is one of the factors that determine how clean and smooth the steel will emerge from the mill. The usual lubricant consists of an emulsion of oil in water. Until recently, little...
journal article 2002
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Van de Graaf, A. (author)
Cracks in welds are a major problem in the steel processing industry. One of the causes is a change in the microstructure that occurs if steel cools too rapidly during the welding process. Researcher Stefan van Bohemen of the Applied Sciences faculty at TU Delft demonstrates how this change is accompanied by the production of high-frequency...
journal article 2002
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Van de Graaf, A. (author)
journal article 2001
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