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were carried out to study impacts of porosity on permafrost degradation and differential thaw depths between the sunny and shady shoulders. The results show that the decrease in porosity due to wind-blown sand or weathered rock debris clogging can worsen the permafrost degradation and lead to the asymmetric thermal regime. In the traditional embankment (without the CRL within it), the largest......
Preparation and Degradation Characteristics of Poly(d,1-laetide) Composite Films陈蕾,李世普摘 要:<正>PDLLA/CHI/β-TCP/NGF composite films were prepared by a solvent evaporation method. The degradation characteristics of the poly(d,1-lactide)composite films were studied in vitro and in vivo. The acidity produced by poly(d,1-lactide)materials......
degradation assessment method based on K-S test was presented. The similarity between empirical distribution function of normal condition sample and that of test sample was calculated by using Kolmogrov-Smirnov test, and then whether the two samples came from the same distribution, i.e., whether the equipment in the same state or not could be judged, so the degradation statements could......
MgF2膜层的点蚀为主.CaF2/MgF2复合膜层试样呈梯度降解趋势,但未实现膜层的整体均匀降解. 表4 图7所示区域EDS成分分析 Table 4 Chemical composition of marked areas in Fig. 7 图8 CaF2/MgF2复合膜层降解过程示意图 Fig. 8 Degradation diagram...艳, 柳歆鹏, 黄佳祈, 刘成龙, 杨 惠, 杨有利. 镁合金表面氟转化层降解过程的电化学阻抗谱[J]. 中国有色金属学报, 2015, 25(2): 401-407. ZHANG Chun-yan, LIU Xin-peng, HUANG Jia-qi, LIU Cheng-long, YANG Hui, YANG You-li. Degradation process of fluorine......
In vitro Degradation of Pure Mg for Esophageal Stent in Artificial SalivaRong-Chang Zeng1,2,Xiao-Ting Li1,2,Li-Jun Liu1,2,Shuo-Qi Li1,2,Fen Zhang1,21. College of Materials Science and Engineering... devices.However,few studies have focused on its application in esophageal stents.In this paper,time-lapse degradation characteristics of pure Mg were analyzed by scanning electron microscopy,energy......
Low Temperature Degradation of Alumina-toughened Zirconia in Artificial Saliva赵永旗1,2,JIANG Li2,LIAO Yunmao2,WANG Chuanyong2,LU Junjun2,ZHANG Jingchao3,李伟21. Department of Stomatology, College of Medicine, Zhejiang University2. State Key Laboratory of Oral Diseases, Sichuan University3. Hainan Stomatological Hospital摘 要:The long-term aging behavior......
the ratio is 2:1. Key words: porous SiO2; CuO; photocatalysis; xanthate degradation 黄药是硫化矿浮选中最常用的一种捕收剂.虽然在选矿过程中大部分黄药进入了泡沫,但尾矿中残余的少量黄药仍然会对环境特别是水体造成污染[1-2].黄药的降解可以采用化学法[3-4],吸附法[5],生物法[6]等.但是,采用化学法降解黄药会引起二次污... xanthate degradation by advanced oxidation processes[J]. Minerals Engineering, 2013, 45(1): 88-93. [2] Webb M, Ruber H, Ledus G. The toxicity of various mining flotation reagents to rainbow trout[J......
Degradation behaviors, thermostability and mechanical properties of poly (ethylene terephthalate)/polylactic acid blendsXIA Xue-lian(夏学莲)1, LIU Wen-tao(刘文涛)1, 2, TANG Xin-ying(唐新颖)1, SHI Xiang-yang(史.... In this work, polylactic acid (PLA) was introduced to improve the degradation of PET. PET/PLA was synthesized by extrusion blending. The thermal, crystalline and mechanical properties of blends were......
CeO2-Nb2O5 photocatalysts for degradation of organic pollutants in waterNathália Pereira Ferraz1,Francielle Candian Firmino Marcos3,Vanessa Aguiar Machado1,René Rojas Rocca1,Elisabete Moreira Assaf3,Yvan Jesus Olortiga Asencios11. Institute of Marine Science,Federal University of Sao Paulo3. Sao Carlos Institute of Chemistry,University of Sao Paulo摘 要: 可降解镁合金材料的研究新进展
郑起1,袁青领1,阎钧1
(1.上海交通大学附属第六人民医院普外科,上海,200233)
摘要:可降解镁合金材料因力学性能佳,生物相容性好以及可降解吸收等特点在植入材料领域成为研究热点.综述了可降解镁合金材料作为心血管支架,骨固定材料和多孔修复材料等的最新研究进展,阐述了其在体内的降解机理以及通过高纯镁合金开发,合金化,表面处理和快速凝固工艺等方法提高镁合金材料耐体液腐蚀性能,指出了目前可降解镁合金材料研究需要解决的问题和未来研究方向,并展望了其今后的临床应用前景.
关键词:可降解镁合金; 植入材料; 降解速度; biodegradable magnesium alloys; implant materials; degradation rate;
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......可降解镁合金材料的研究新进展
来源： 《材料导报2010年第5期》——郑起 袁青领 阎钧
