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500kV断路器合闸电阻事故分析与故障检测 被引量:6
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作者 张帆 《中国科技信息》 2013年第4期82-82,共1页
虽然合闸电阻是500kV断路器的重要组成部分,但是由于设计上的原因,常规试验方法很难对断路器合闸电阻的运行状况进行检测。文章通过对一起直流500kV换流站断路器合闸电阻事故的分析,指出了目前500kV断路器的合闸电阻在其结构设计上存在... 虽然合闸电阻是500kV断路器的重要组成部分,但是由于设计上的原因,常规试验方法很难对断路器合闸电阻的运行状况进行检测。文章通过对一起直流500kV换流站断路器合闸电阻事故的分析,指出了目前500kV断路器的合闸电阻在其结构设计上存在的不便于试验检测之处,并针对性地列举了2种非试验性检测方法,同时提出了这2种方法的使用建议,希望对断路器合闸电阻的检修有所帮助。 展开更多
关键词 闸电阻 内窥镜 预合时间
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New Keynesian Model and Inflation Prediction
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作者 Yutaka Kurihara 《Chinese Business Review》 2013年第1期34-40,共7页
Recently, much dispute has occurred about the validity of the New Keynesian model from both theoretical and empirical views. However, a few studies have analyzed this model from the empirical perspective. Few other st... Recently, much dispute has occurred about the validity of the New Keynesian model from both theoretical and empirical views. However, a few studies have analyzed this model from the empirical perspective. Few other studies have analyzed this model directly or nearly directly. This article empirically examines the New Keynesian model focusing on inflation forecast. Generalized method of moments (GMM) is used to examine whether the typical Keynesian model with Taylor rule is empirically appropriate for the US, UK, Euro area, and Japan. The results showed: (1) the New Keynesian model fits well in most cases and explains the real economy well. Taylor rule also fits well for most cases; (2) Rational expectations for inflation rates may not be useful based on this model When AR (1) (time series analysis) model is used to capture inflation expectations instead of one-time ahead real values, the model fits well. With measured expectations, the relative weight of the forward-looking terms increase on the cost of lagged inflation and output terms, even up to the point at which the lagged inflation terms are no longer needed to rescue the new Keynesian model; and (3) Forward-looking variables play more important roles than backward-looking ones in economic activity. Results with expectations with forward-looking terms perform better in general. This New Keynesian model may reduce the importance of lagged output in some cases 展开更多
关键词 EXPECTATION FORWARD-LOOKING INFLATION New Keynesian OUTPUT Taylor rule
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Russian Experience of the Rational Thromboprophylaxis in Traumatology and Orthopaedics
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作者 Firsov Sergey Anatolyevich Levshin Andrey Matveev Rudolf 《Journal of Pharmacy and Pharmacology》 2016年第4期155-161,共7页
Analysis of the safety and efficacy of the currently marked oral anticoagulants was performed in patients after large joints arthroplasty. A total of 5025 patients after total knee arthroplasty and 5216 patients after... Analysis of the safety and efficacy of the currently marked oral anticoagulants was performed in patients after large joints arthroplasty. A total of 5025 patients after total knee arthroplasty and 5216 patients after total hip arthroplasty were examined. All patients were divided into groups by the prescribed anticoagulant. The duration of anticoagulant therapy was 35 days and 6 weeks after surgery, respectively. Ultrasonography of the lower extremities veins was performed in all patients prior to the surgery and 5 days after surgery. In patients receiving Dabigatran, the incidence of clinically significant deep vein thrombosis was lower compared with patients receiving Rivaroxaban and Apixaban; in contrast, the rate of postoperative hematomas in the last two groups was higher. 展开更多
关键词 THROMBOPROPHYLAXIS ARTHROPLASTY oral anticoagulants.
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Influence of Pre-deformation on Phase Transformations and Microstructures in Near β Ti Alloy During Aging
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作者 Song Bo Xi Honglei +4 位作者 Fu Yu Wang Junshuai Xiao Wenlong Ren Yanbiaot Ma Chaoli 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2024年第11期3001-3009,共9页
The influence of pre-deformation on phase transformations,microstructures and hardening response in nearβTi alloy Ti5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe(wt%)during aging treatment was studied.The results show that obviousαpha... The influence of pre-deformation on phase transformations,microstructures and hardening response in nearβTi alloy Ti5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe(wt%)during aging treatment was studied.The results show that obviousαphase refinement and stronger age hardening effect can be achieved when the alloy is slightly deformed before aging treatment.Because the formation of intermediate phases(O′,ωand O′′)suppresses long-range stress induced martensitic transformation and mechanical twinning,the alloy is mainly deformed via dislocation slipping during loading.Large numbers of crystal defects are generated during predeformation.With increasing the predeformation,the number density of dislocations increases gradually.These crystal defects generated by pre-deformation may partly annihilate upon early aging,but the precipitation ofαcan also be promoted,resulting in refinedαprecipitates.In the sample with 5%pre-strain,the average thickness ofαprecipitates decreases by 57%after aging at 600℃ compared with the sample without pre-strain,and the number density increases from 7.0±1 laths/μm^(2)to 22.0±3 laths/μm^(2).Some platelet-shapedαphases form when the samples experience comparably large pre-strains such as 12%and 20%.It proves that the refinedαprecipitates and better hardening effect can be achieved by pre-deformation plus aging treatment for titanium alloy. 展开更多
关键词 titanium alloy pre-deformation plus aging treatment intermediate phases αprecipitate
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