A simple method was proposed to control the nanotribology behaviors of monocrystalline silicon against SiO2 microsphere by adjusting relative humidity (RH). Experimental results indicated that adhesion work, friction coefficient, and nanowear of silicon against SiO2 microsphere significantly varied between 60% and 90% RH. Under 60% RH, adhesion work was 119 mN/m, and friction coefficient was about 0.53. However, adhesion work and friction coefficient decreased to ∼70 mN/m and ∼0.3 under 90% RH, respectively. An apparent wear track ∼13 nm deep formed on the silicon surface under 60% RH, whereas no obvious wear scar was observed on the silicon surface under 90% RH. Analysis indicated that such tribological behaviors were due to different water condensations on the silicon surface under 60% and 90% RH. Under 60% RH, the water that condensed on the surfaces of the silicon sample and SiO2 tip mainly consisted of ice-like water. As a result, adhesion work was enlarged by the breaking force of the ice-like water bridge in the contact area. Given that a ≡Si–O–Si≡ bonding bridge easily formed between the silicon surface and the SiO2 tip with the help of water condensation under 60% RH instead of 90% RH, the friction coefficient was large and the nanowear of the silicon sample was severe under 60% RH. These results may help elucidate the nanotribology behaviors of silicon and facilitate the tribological design of dynamic microelectromechanical systems working under humid conditions.
Liang et al.:Buqi Ziyin Combined with Traditional Chinese Medicine Nursing on Thyroid Cancer PatientsTo explore the effect of self made Buqi Ziyin formula combined with traditional Chinese medicine nursing on the prognosis of patients with differentiated thyroid cancer after operation. 174 patients with differentiated thyroid cancer in our hospital from June 2018 to June 2020 were randomly divided into observation group and control group, 87 cases in each group. The patients in the control group were treated with levothyroxine sodium tablets, 50~100 μg/time once a d, while the patients in the observation group were additionally treated with self made Buqi Ziyin prescription, one dose a day, decoction in morning and evening 200 ml each time. Both groups were treated for 2 mo. The control group adopted the routine nursing plan of our hospital, while the observation group added the traditional Chinese medicine meridian massage nursing on the basis of the control group. The immune function, thyroid hormone level, psychological state and treatment effect of the two groups before and after treatment were compared and analyzed. There was no significant difference in the levels of free triiodiothyronine, free thyroxine and thyroid stimulating hormone between the two groups before treatment (p>0.05), which was comparable; after treatment, the levels of free triiodiothyronine and free thyroxine in the observation group were significantly higher than those in the control group and the level of thyroid stimulating hormone in the observation group was significantly higher than that in the control group after treatment, the percentage of cluster of differentiation 3+ and cluster of differentiation 4+ in the observation group was significantly higher than that before treatment (p<0.05) and it was also significantly higher than that in the control group after treatment (p<0.05). The percentage of cluster of differentiation 8+ decreased significantly, which was significantly lower than that before treatment and in the control group (p<0.05) The score was significantly lower than that before treatment (p<0.05); at the same time, it was significantly lower than that in the control group (p<0.05); but there was no statistical difference between the two scores in the control group before and after treatment (p>0.05); after treatment, the total effective rate of the observation group was significantly higher than that in the control group (p<0.05) and the total incidence of complications in the observation group was lower than that in the control group, but the difference was not statistically significant (p>0.05). The self made Buqi Ziyin formula combined with traditional Chinese medicine nursing can effectively improve the postoperative recovery speed and quality of life of patients with differentiated thyroid cancer, reduce the probability of disease recurrence, enhance the body's immune ability and reduce the incidence of adverse reactions, which is worthy of clinical application and promotion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.