Dynamic strain aging (DSA) is an important phenomenon in solutehardened metals and seri- ously affects the mechanical properties ofmetals. DSA is generally induced by the interaction between themoving dislocations and...Dynamic strain aging (DSA) is an important phenomenon in solutehardened metals and seri- ously affects the mechanical properties ofmetals. DSA is generally induced by the interaction between themoving dislocations and the mobile solute atoms. In this paper, onlythe interaction between moving disloca- tions and mobile solute atomsin a dislocation core area (core atmosphere) will be taken intoaccount. To es- tablish the constitutive model which can describe theDSA phenomenon, we improved the Zerilli-Armstrongdislocation-mechanics-based thermal viscoplastic constitutiverelation, and added the effect of the interaction between the movingdislocations and core atmosphere.展开更多
目的系统评价多孔钽棒移植与骨移植应用于髓芯减压保髋手术的有效性。方法检索Pubmed、Cochrane Library、Embase、Web of ScienceTM、中国生物医学文摘数据库、中国期刊全文数据库、万方数据库、维普数据库,搜集所有髓芯减压保髋手术...目的系统评价多孔钽棒移植与骨移植应用于髓芯减压保髋手术的有效性。方法检索Pubmed、Cochrane Library、Embase、Web of ScienceTM、中国生物医学文摘数据库、中国期刊全文数据库、万方数据库、维普数据库,搜集所有髓芯减压保髋手术中使用多孔钽棒移植和骨移植的随机对照试验和队列研究。两名研究者分别筛选文献、严格评价纳入研究质量并提取数据。采用R软件进行统计分析。结果最终纳入9项随机对照试验、4项前瞻性队列研究和4项回顾性队列研究,共计932例(1011髋)患者。钽棒移植组476例(517髋),骨移植组456例(494髋)。与骨移植组相比,钽棒移植组在术中出血量[MD=–22.24,95%CI(–30.46,–14.02)]、手术时间[MD=–13.67,95%CI(–17.22,–10.12)]、住院时间[MD=–2.53,95%CI(–3.37,–1.69)]、术后Harris评分[MD=7.49,95%CI(5.16,9.82)]等方面具有更优表现(P<0.05);但术后视觉模拟量表评分[MD=–0.92,95%CI(–2.02,0.18)]比较,差异无统计学意义(P>0.05)。结论与骨移植相比较,髓芯减压保髋手术中应用多孔钽棒移植可有效减少术中出血量,缩短手术时间和住院时间,术后髋关节功能恢复更佳,但在患髋疼痛改善方面,两种术式疗效相似。本次Meta分析纳入的研究质量欠佳,未来需要开展大样本、多中心的随机对照研究,为保髋手术的术式选择提供更好的临床证据。展开更多
基金the Chinese Academy of Sciences and the High Technical Project.
文摘Dynamic strain aging (DSA) is an important phenomenon in solutehardened metals and seri- ously affects the mechanical properties ofmetals. DSA is generally induced by the interaction between themoving dislocations and the mobile solute atoms. In this paper, onlythe interaction between moving disloca- tions and mobile solute atomsin a dislocation core area (core atmosphere) will be taken intoaccount. To es- tablish the constitutive model which can describe theDSA phenomenon, we improved the Zerilli-Armstrongdislocation-mechanics-based thermal viscoplastic constitutiverelation, and added the effect of the interaction between the movingdislocations and core atmosphere.
文摘目的系统评价多孔钽棒移植与骨移植应用于髓芯减压保髋手术的有效性。方法检索Pubmed、Cochrane Library、Embase、Web of ScienceTM、中国生物医学文摘数据库、中国期刊全文数据库、万方数据库、维普数据库,搜集所有髓芯减压保髋手术中使用多孔钽棒移植和骨移植的随机对照试验和队列研究。两名研究者分别筛选文献、严格评价纳入研究质量并提取数据。采用R软件进行统计分析。结果最终纳入9项随机对照试验、4项前瞻性队列研究和4项回顾性队列研究,共计932例(1011髋)患者。钽棒移植组476例(517髋),骨移植组456例(494髋)。与骨移植组相比,钽棒移植组在术中出血量[MD=–22.24,95%CI(–30.46,–14.02)]、手术时间[MD=–13.67,95%CI(–17.22,–10.12)]、住院时间[MD=–2.53,95%CI(–3.37,–1.69)]、术后Harris评分[MD=7.49,95%CI(5.16,9.82)]等方面具有更优表现(P<0.05);但术后视觉模拟量表评分[MD=–0.92,95%CI(–2.02,0.18)]比较,差异无统计学意义(P>0.05)。结论与骨移植相比较,髓芯减压保髋手术中应用多孔钽棒移植可有效减少术中出血量,缩短手术时间和住院时间,术后髋关节功能恢复更佳,但在患髋疼痛改善方面,两种术式疗效相似。本次Meta分析纳入的研究质量欠佳,未来需要开展大样本、多中心的随机对照研究,为保髋手术的术式选择提供更好的临床证据。
