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 Novelties 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

The aim of this study is to explore the role that accounting systems effectively played in managing the internal relationships among the various administrative bodies of the Comune (City State) of Siena in the 14th century.This period was TRUE FOCUS characterized by an ever increasing need to monitor economic activities, a need perceived by the Com

Objectives: Addiction to social networking sites (SNSs) is an international issue with numerous methods of measurement.The impact of such addictions among health science students is of particular concern.This study aimed to measure SNS addiction rates among health sciences students at Sultan Qaboos University (SQU) in Muscat, Oman.Methods: In April

Seorang anak bisa menjadi anak jalanan tentu mempunyai hal yang melatarbelakangi dalam kehidupannya.Sehingga anak jalanan sangat rentan untuk terjerumus kedalam perilaku menyimpang salah satunya adalah perilaku inhalasi zat adiktif seperti Lysergic Acid Diethylamide (LSD).Tujuan penelitian ini untuk mengeksplorasi dan menggambarkan pengalaman anak