This paper presents a novel steering mechanism embedded in a point-the-bit rotary steerable system (RSS) for oilfield exploitation.The new steering mechanism adopts a set of universal joints to alleviate the high alternative strain on drilling mandrel and employs a specially designed planetary gear small tooth number difference (PGSTD) to achieve d
Cryptosporidium spp.are coccidians, oocysts-forming apicomplexan protozoa, which complete their life cycle both in humans and animals, through zoonotic and anthroponotic transmission, causing cryptosporidiosis.The global burden of this disease is still underascertained, due to a conundrum transmission modality, only partially unveiled, and on Phosp
As a natural working fluid, CO 2 is receiving more and more attention in the refrigeration.The key technology of the research of CO 2 transcritcia cycle is to improve the coefficient of performance of the system that is competitive with present conventional high performance refrigerant systems.In order to lower the throttling losses in the CO 2 tra