Magnetron sputtering NbSe_(2)film as lubricant for space current-carrying sliding contact

This study demonstrates that magnetron-sputtered NbSe_(2)film can be used as a lubricant for space current-carrying sliding contact,which accommodates both metal-like conductivity and MoS_(2)-like lubricity.Deposition at low pressure and low energy is performed to avoid the generation of the interference phase of NbSe_(3).The composition,microstructure,and properties of the NbSe_(2)films are further tailored by controlling the sputtering current.At an appropriate current,the film changed from amorphous to crystalline,maintained a dense structure,and exhibited excellent comprehensive properties.Compared to the currently available electrical contact lubricating materials,the NbSe_(2)film exhibits a significant advantage under the combined vacuum and current-carrying conditions.The friction coefficient decreases from 0.25 to 0.02,the wear life increases more than seven times,and the electric noise reduces approximately 50%.

Lower lymphocyte to monocyte ratio is a potential predictor of poor outcome in patients with cerebral venous sinus thrombosis

Background Lymphocyte to monocyte ratio(LMR)is associated with functional outcome in patients with stroke.But the relationship between the LMR value and the prognosis of cerebral venous sinus thrombosis(CVST)has not been investigated.Methods CVST patients,admitted to the First Affiliated Hospital of Zhengzhou University,were retrospectively identified from November 2010 to January 2017.Functional outcomes of patients were evaluated with the modified Rankin Scale(mRS).Patients were divided into good(mRS 0-2)and poor(mRS 3-6)outcomes groups.Univariate and multivariate Cox regression analyses were used to assess the relationship between LMR and the poor survival outcome.Results A total of 228 patients were included of which 41 had poor outcomes(18.0%).The duration of follow-up was 22 months(6-66 months).LMR(2.3±1.2 vs 3.2±1.8,p<0.01)was significantly lower in the poor outcome group.Multivariate Cox regression analysis showed that LMR(HR 0.726,95%CI 0.546 to 0.964,p=0.027)was a independent predictor of poor prognosis.Conclusions LMR may be a predictor of poor prognosis in CVST patients.