Seven coals from the Carbonera Formation and six from the Los Cuervos Fm., in the Casigua - El Cubo area, the State of Zulia, Venezuela, have been characterized according to physical (HGI hardness), rheological (FSI, plastometry, dilatometry) and chemical parameters (proximate and ultimate analysis, sulfur forms, major elements in ashes).The sample
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 QBe2 beryllium bronze and 38CrMoAlA steel tribo-pair
Changes of the hard dental structures due to physiological processes, or pathological under the action of physical, chemical or microbiological factors through the oral liquid that performs a number of functions in maintaining a health balance of the oral cavity through the multitude of functions.Recent studies show us the changes in the oral cavit
BackgroundThere is growing recognition of the importance of menstruation in achieving health, education, and gender equality for all.New policies in high income countries (HICs) have responded to anecdotal evidence that many struggle to meet their menstrual health needs.Qualitative research has explored lived experiences of menstruating in HICs and