OPEC siege members of OPEC were taken hostage in Vienna, Austria, where the ministers were attending a meeting at the OPEC headquarters at Dr-Karl-Lueger-Ring 10 (renamed Universitätsring in 2012). The hostage attack was orchestrated by a six-person team led by Venezuelan terrorist Carlos the Jackal (which included Gabriele Kröcher-Tiedemann, Hans-Joachim Klein and Anis al-Naqqash). The self-named "Arm of the Arab Revolution" group called for the liberation of Palestine. Carlos planned to take over the conference by force and kidnap all eleven oil ministers in attendance and hold them for ransom, with the exception of Ahmed Zaki Yamani and Iran's Jamshid Amuzegar, who
Damp (structural) D Hoff in their paper "Rising damp: capillary rise dynamics in walls". The analysis is based on experimentally well established properties of porous building materials and the physics of evaporation from building surfaces. Hall and Hoff show that the model can be used to predict the height to which damp will rise in a wall. The height of rise depends on the wall thickness, the sorptivity of the wall structure and the rate of evaporation. Further work has confirmed experimentally the importance of mortar properties in determining the height to which damp will rise in walls. "BRE Digest" 245 lists