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It is shown that four point resistivity measurements can be used to detect decay in living trees. A low frequency alternating current is injected into the trunk and the induced voltage is measured between two points along the trunk. With additional measurement of the cross section area, the effective resistivity of the trunk is estimated. A comparison within a group of trees shows that trees in de
Abstract is not available
The article reports and discusses a long-term qualitative study of forty 8–10-year-old students who regularly played a math game during math lessons for 9 weeks. The goal was to explore the relations between (i) some of the pedagogical principles that underlie the game and (ii) the playing practice in terms of what actually takes place when students play the math game during regular math lessons.
Supply chains are difficult to plan because they involve complex relationships that influence supply chain performance. In this paper, discrete-event simulation (DES) is discussed in order to identify if it could be a technique used to improve supply chain planning. Two DES models have been developed and are used in this paper to find out whether DES could be a technique for unraveling the complex
A new spectrometer for studying photoinduced fragmentation has been designed and commissioned. The instrument produces a detailed view of the energy and angular emission of fragments, which in the case of small molecules can be related to their geometry at the moment of dissociation. The spectral profiles for single, double and triple ion coincidences are analyzed in terms of molecular alignment,
