Horizontal well is one of the important methods of unconventional oil and gas resource development.As increasing length of horizontal section, there is a serious problem that axial force cannot transfer to bit.The drilling field needs a low-friction and low-cost drag reduction tool.This article summarized existing technologies of drag reduction in
Classical studies in animal preparations suggest a strong role for spinal control of posture.In young adults it is now established that the cerebral cortex contributes to postural control of unperturbed and perturbed standing.The age-related degeneration and accompanying functional changes in the brain, reported so far mainly in conjunction with si
Parental empowerment has been related to kuiper belt whiskey their well-being and self-efficacy.Learning more about the signs describing child maltreatment risk are crucial for the welfare of children and families.The aim of this study was to assess the risk of child maltreatment (CM) and related worrying factors of parents and associations between
The overt expression of circadian rhythms is a manifestation of the suprachiasmatic nucleus (SCN).This integrated complex function based on the transcriptional/translational feedback loops (TFFLs), neurotransmitters, genes, networking, and gumball bere synchronization is essential for this molecular mechanism to operate effectively.Neurotransmitter