Understanding the WOB and the law of tubular buckling is significant to handle workover operation efficiently and safely.Based on the simulation theory and the characteristics of workover string dynamics,a finite element model is established for the workover string.Then,the tubular in the wellbore is simulated by the model,and the simulation result
Climate change currently taking place around the world requires humanity to take decisive action.One way, as envisaged in the European Green Deal, is to reduce the emissions of harmful chemical compounds of the transport sector by 90% by 2050.This reduction also applies to aviation.The most commonly suggested means of achieving this goal is the ele
Music is an integral part of the cultural heritage of all known human societies, with the capacity for music perception and production present in most people.Researchers generally agree that both genetic and environmental factors contribute to the broader realisation of music ability, with the degree of music aptitude varying, not only from individ
Perfluoropolyethers (PFPEs) are widely used as hard disk lubricants for protecting carbon overcoat reducing friction between the hard disk interface and the head during the movement of head during reading and writing data in the hard disk.Due to temperature rise of PFPE Zdol lubricant molecules on a DLC surface, how polar end groups are detached fr
Understanding the individual and interactive roles of consumer species is more than academic when the host plant is a subject of intense conservation interest.In a mesocosm experiment, we compared effects of common invertebrate grazers in San Francisco Bay seagrass (Zostera marina, eelgrass) beds, finding that some species (a native opisthobranch,