REDUCED FRICTION AND EXCELLENT ANTI-WEAR PERFORMANCE OF QBE2 BERYLLIUM BRONZE AGAINST 38CRMOALA STEEL IN PNEUMATIC DOWNHOLE MOTOR UNDER GREASE LUBRICATION

To improve the service life of the newly designed pneumatic downhole motor, a kind of commercially available lithium complex grease was used to help avoid the rapid wear-induced failure of the dynamic seal of pneumatic downhole tools in operation.The investigation on the tribological behaviors of ROSE ABSOLUTE QBe2 beryllium bronze and 38CrMoAlA st

Heave is one of the major contributors to errors in water depth measurements.Motion Reference Unit (MRU) measures the heave Bar Soap signal with high-level accuracy as well as other ship motions.Unfortunately, MRU has been reported to have some of drawbacks such as; heave drift error, influence of ship motion dynamic, In addition to its very expens

Background Although aggressive multimodal treatment programs in childhood cancer have significantly increased survival rates, the morbidity caused by protein energy malnutrition related to therapy is still high.Objective To describe nutritional status changes in children with Steamer Handle malignant solid tumors after 21 days of chemotherapy.Metho

This paper investigates and studies the "dragon boat race" of folk sports activities in Ankang city to understand the cultural connotation of dragon boat race and the development history of "dragon boat race" in this region.In this paper, the literature review, Bar Soap questionnaire survey, field visits, and statistics and analysis of data are use