This paper presents a control system design methodology for the drill-string rotary drive and draw-works hoist system aimed at mature drilling rig retrofitting.The rotary Sound meters drive is equipped with an active damping speed control system featuring a proportional-integral speed controller readily available within modern controlled electrical
Most of the coupled models contain a strong warm bias in sea surface temperature (SST) over the Atlantic Cold Tongue (ACT) region (10° S–3° N, 20° W–10° E) during June–August (JJA) and September–November (SON).In this study, the origins of the ACT SST bias and their relative contributions to the bias are expl
This article starts from the premise that the man-made global warming hypothesis, which constitutes the scientific underpinning of the Kyoto Protocol, that expires in 2012, is fundamentally flawed.It nevertheless presents two scenarios of a possible ‘Son of Kyoto’: ‘Europe’s Alleingang’ and &lsq
Abstract The pre-Colombian wall paintings in Peru were already known from north and central coast sites, but little information exists on the southern coast corresponding to the Nasca region.The recent excavations on Cahuachi site provided fragments of plaster with paint layers found near Great Pyramid, corresponding to phases III and IV of the con