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钛等离子渗氧研究 被引量:12
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作者 郑传林 徐重 +2 位作者 谢锡善 贺志勇 董建新 《金属热处理》 CAS CSCD 北大核心 2002年第3期35-37,共3页
探讨了空心阴极效应 (HollowCathodeEffect)、离子轰击对钛氧化层结构的影响。结果表明 ,离子轰击加强氧的离化、促进渗氧 。
关键词 钛等离子 辉光放电 离子轰击 渗氧硬化
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钛等离子渗氧研究 被引量:7
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作者 郑传林 徐重 +2 位作者 谢锡善 贺志勇 董建新 《北京科技大学学报》 EI CAS CSCD 北大核心 2002年第1期44-46,共3页
为了提高钛表面硬度和耐磨性,采用辉光放电等离子渗氧技术对钛进行表面处理.结果表明,渗氧层厚度与氧分压、温度和时间呈明显的对应关系.特别是,在空心阴极辉光放电条件下,离子轰击会加强氧的离子化,促进渗氧,有助于低价态氧化... 为了提高钛表面硬度和耐磨性,采用辉光放电等离子渗氧技术对钛进行表面处理.结果表明,渗氧层厚度与氧分压、温度和时间呈明显的对应关系.特别是,在空心阴极辉光放电条件下,离子轰击会加强氧的离子化,促进渗氧,有助于低价态氧化物的形成.在表层所形成的TiO其硬度达到或接近TiN的硬度水平. 展开更多
关键词 辉光放电 离子轰击 渗氧硬化 钛合金 表面处理 等离子 化层结构
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Increased intestinal macromolecular permeability and urine nitrite excretion associated with liver cirrhosis with ascites 被引量:16
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作者 Soong Lee Seung-Cheol Son +6 位作者 Moon-Jong Han Woo-Jin Kim Soo-Hyun Kim Hye-Ran Kim Woo-Kyu Jeon Ki-Hong Park Myung-Geun Shin 《World Journal of Gastroenterology》 SCIE CAS CSCD 2008年第24期3884-3890,共7页
AIM: To determine intestinal permeability, the serum tumor necrosis factor (TNF)-α level and urine nitric oxide (NO) metabolites are altered in liver cirrhosis (LC) with or without ascites. METHODS: Fifty-thr... AIM: To determine intestinal permeability, the serum tumor necrosis factor (TNF)-α level and urine nitric oxide (NO) metabolites are altered in liver cirrhosis (LC) with or without ascites. METHODS: Fifty-three patients with LC and 26 healthy control subjects were enrolled in the study. The intestinal permeability value is expressed as the percentage of polyethylene glycol (PEG) 400 and 3350 retrieval in 8-h urine samples as determined by high performance liquid chromatography. Serum TNF-α concentrations and urine NO metabolites were determined using an enzyme-linked immunosorbent assay (ELISA) and Greiss reaction method, respectively. RESULTS: The intestinal permeability index wassignificantly higher in patients with LC with ascites than in healthy control subjects or patients with LC without ascites (0.88 ± 0.12 vs 0.52 ± 0.05 or 0.53 ± 0.03, P 〈 0.05) and correlated with urine nitrite excretion (r = 0.98). Interestingly, the serum TNF-α concentration was significantly higher in LC without ascites than in control subjects or in LC with ascites (198.9 ± 55.8 pg/mL vs 40.9 ± 12.3 pg/mL or 32.1 ± 13.3 pg/mL, P 〈 0.05). Urine nitrite excretion was significantly higher in LC with ascites than in the control subjects or in LC without ascites( 1170.9± 28.7 μmol/L vs 903.1 ± 55.1 μmol/L or 956.7 ± 47.7 μmol/L, P 〈 0.05). COMCLUSIOM: Increased intestinal macromolecular permeability and NO is probably of importance in the pathophysiology and progression of LC with ascites, but the serum TNF-α concentration was not related to LC with ascites. 展开更多
关键词 Intestinal permeability Tumor necrosisfactor-R Nitric oxide Liver cirrhosis ASCITES
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