In order to overcome the embrittlement of metastable titanium alloys caused by the precipitation ofωiso phase during aging,regulation of isothermalωprecipitation was investigated in Ti−15Mo alloy.The results show th...In order to overcome the embrittlement of metastable titanium alloys caused by the precipitation ofωiso phase during aging,regulation of isothermalωprecipitation was investigated in Ti−15Mo alloy.The results show that the sample is brittle when direct aging(A)is applied at 350℃for 1 h after solution treatment(ST).If pre-deformation(D)is performed on the ST sample to induce{332}twins and secondaryα″phase,subsequent aging at 350℃(STDA350)improves the strength to 931 MPa with a good ductility of about 20%maintained.However,when aging is performed at 400℃or 450℃(STDA400/450),the strength can be further improved,but the ductility is dramatically reduced.Atomic-scale characterizations show that the partial collapse ofωphase in the STDA350 sample effectively eliminates aging-induced embrittlement,but complete collapse leads to poor ductility in the STDA400/450 sample.展开更多
目的检索并汇总维持性血液透析(maintenance hemodialysis,MHD)患者不宁腿综合征(restless legs syndrome,RLS)症状管理的最佳证据,为临床实践提供循证依据。方法系统检索国内外数据库及指南网站中有关MHD患者RLS症状管理的临床决策、...目的检索并汇总维持性血液透析(maintenance hemodialysis,MHD)患者不宁腿综合征(restless legs syndrome,RLS)症状管理的最佳证据,为临床实践提供循证依据。方法系统检索国内外数据库及指南网站中有关MHD患者RLS症状管理的临床决策、指南、证据总结、系统评价、专家共识及随机对照试验,检索时限为建库至2024年5月30日。结果共纳入14篇文献,包括4篇临床决策、2篇指南、1篇证据总结和7篇系统评价,汇总出29条最佳证据,包括管理受益、诊断与管理、危险/加重因素、评估与监测、透析优化、补充替代疗法、药物治疗和健康教育8个方面。结论本研究汇总了MHD患者RLS症状管理的最佳证据,为医护人员临床实践提供了循证依据。展开更多
Combined with actual situation of Fengxian power Supply Company, the neutral grounding modes of Fengxian 35 kV and 10 kV power grid are studied in the paper. The different frequencies injected method is used to measur...Combined with actual situation of Fengxian power Supply Company, the neutral grounding modes of Fengxian 35 kV and 10 kV power grid are studied in the paper. The different frequencies injected method is used to measure the capacitive current of Fengxian 28 substations, and the neutral grounding modes of the 28 substations are determined based on the measured values of capacitive current.展开更多
基金the financial support from the National Natural Science Foundation of China (No. 52374380)the China Postdoctoral Science Foundation (Nos. 2023M730234, 2024T171126)。
文摘In order to overcome the embrittlement of metastable titanium alloys caused by the precipitation ofωiso phase during aging,regulation of isothermalωprecipitation was investigated in Ti−15Mo alloy.The results show that the sample is brittle when direct aging(A)is applied at 350℃for 1 h after solution treatment(ST).If pre-deformation(D)is performed on the ST sample to induce{332}twins and secondaryα″phase,subsequent aging at 350℃(STDA350)improves the strength to 931 MPa with a good ductility of about 20%maintained.However,when aging is performed at 400℃or 450℃(STDA400/450),the strength can be further improved,but the ductility is dramatically reduced.Atomic-scale characterizations show that the partial collapse ofωphase in the STDA350 sample effectively eliminates aging-induced embrittlement,but complete collapse leads to poor ductility in the STDA400/450 sample.
文摘目的检索并汇总维持性血液透析(maintenance hemodialysis,MHD)患者不宁腿综合征(restless legs syndrome,RLS)症状管理的最佳证据,为临床实践提供循证依据。方法系统检索国内外数据库及指南网站中有关MHD患者RLS症状管理的临床决策、指南、证据总结、系统评价、专家共识及随机对照试验,检索时限为建库至2024年5月30日。结果共纳入14篇文献,包括4篇临床决策、2篇指南、1篇证据总结和7篇系统评价,汇总出29条最佳证据,包括管理受益、诊断与管理、危险/加重因素、评估与监测、透析优化、补充替代疗法、药物治疗和健康教育8个方面。结论本研究汇总了MHD患者RLS症状管理的最佳证据,为医护人员临床实践提供了循证依据。
文摘Combined with actual situation of Fengxian power Supply Company, the neutral grounding modes of Fengxian 35 kV and 10 kV power grid are studied in the paper. The different frequencies injected method is used to measure the capacitive current of Fengxian 28 substations, and the neutral grounding modes of the 28 substations are determined based on the measured values of capacitive current.
