The corrosion-wear behavior of a nanocrystalline Fe_（88）Si_（12） alloy disc coupled with a Si_3N_4 ball was investigated in acid（pH 3） and alkaline（pH 9） aqueous solutions. The dry wear was also measured for re...The corrosion-wear behavior of a nanocrystalline Fe_（88）Si_（12） alloy disc coupled with a Si_3N_4 ball was investigated in acid（pH 3） and alkaline（pH 9） aqueous solutions. The dry wear was also measured for reference. The average friction coefficient of Fe_（88）Si_（12） alloy in the pH 9 solution was approximately 0.2, which was lower than those observed for Fe_（88）Si_（12） alloy in the pH 3 solution and in the case of dry wear. The fluctuation of the friction coefficient of samples subjected to the pH 9 solution also showed similar characteristics. The wear rate in the pH 9 solution slightly increased with increasing applied load. The wear rate was approximately one order of magnitude less than that in the pH 3 solution and was far lower than that in the case of dry wear, especially at high applied load. The wear traces of Fe_（88）Si_（12） alloy under different wear conditions were examined and analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The results indicated that the tribo-chemical reactions that involve oxidation of the worn surface and hydrolysis of the Si_3N_4 ball in the acid solution were restricted in the pH 9 aqueous solution. Thus, water lubrication can effectively improve the wear resistance of nanocrystalline Fe_（88）Si_（12） alloy in the pH 9 aqueous solution.展开更多
BACKGROUND Hilar masses with stenosis of the bronchus occur mainly due to malignant diseases,such as lung cancer.Hilar masses resulting from invasive aspergillosis are extremely rare and occur mostly in severely immun...BACKGROUND Hilar masses with stenosis of the bronchus occur mainly due to malignant diseases,such as lung cancer.Hilar masses resulting from invasive aspergillosis are extremely rare and occur mostly in severely immunosuppressed patients.CASE SUMMARY In the current case report,we have documented a unique case of invasive aspergillosis presenting as a mass in the hilum and bronchial stenosis under bronchoscopy mimicking lung cancer in a 54-year-old man with diabetes mellitus.The histological analysis of bronchial membrane biopsy demonstrated fungal elements of 45°branching hyphae with positive Periodic Acid-Schiff and Grocott staining.After 3 mo of antifungal therapy,the symptoms,computed tomography scan and bronchoscopy manifestations all showed improvement.CONCLUSION We highlight that clinicians should consider a diagnosis of invasive aspergillosis when radiological examination shows pseudotumor appearance in diabetes mellitus patients.展开更多
基金supported by the National Natural Science Foundation of China(No.51201172)
文摘The corrosion-wear behavior of a nanocrystalline Fe_（88）Si_（12） alloy disc coupled with a Si_3N_4 ball was investigated in acid（pH 3） and alkaline（pH 9） aqueous solutions. The dry wear was also measured for reference. The average friction coefficient of Fe_（88）Si_（12） alloy in the pH 9 solution was approximately 0.2, which was lower than those observed for Fe_（88）Si_（12） alloy in the pH 3 solution and in the case of dry wear. The fluctuation of the friction coefficient of samples subjected to the pH 9 solution also showed similar characteristics. The wear rate in the pH 9 solution slightly increased with increasing applied load. The wear rate was approximately one order of magnitude less than that in the pH 3 solution and was far lower than that in the case of dry wear, especially at high applied load. The wear traces of Fe_（88）Si_（12） alloy under different wear conditions were examined and analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The results indicated that the tribo-chemical reactions that involve oxidation of the worn surface and hydrolysis of the Si_3N_4 ball in the acid solution were restricted in the pH 9 aqueous solution. Thus, water lubrication can effectively improve the wear resistance of nanocrystalline Fe_（88）Si_（12） alloy in the pH 9 aqueous solution.
基金Supported by Wenzhou Municipal Science and Technology Bureau,No.ZH2017001
文摘BACKGROUND Hilar masses with stenosis of the bronchus occur mainly due to malignant diseases,such as lung cancer.Hilar masses resulting from invasive aspergillosis are extremely rare and occur mostly in severely immunosuppressed patients.CASE SUMMARY In the current case report,we have documented a unique case of invasive aspergillosis presenting as a mass in the hilum and bronchial stenosis under bronchoscopy mimicking lung cancer in a 54-year-old man with diabetes mellitus.The histological analysis of bronchial membrane biopsy demonstrated fungal elements of 45°branching hyphae with positive Periodic Acid-Schiff and Grocott staining.After 3 mo of antifungal therapy,the symptoms,computed tomography scan and bronchoscopy manifestations all showed improvement.CONCLUSION We highlight that clinicians should consider a diagnosis of invasive aspergillosis when radiological examination shows pseudotumor appearance in diabetes mellitus patients.
