During subway operation,various factors will cause long-term land subsidence,such as the vibration subsidence of foundation soil caused by train vibration load,incomplete consolidation deformation of foundation soil d...During subway operation,various factors will cause long-term land subsidence,such as the vibration subsidence of foundation soil caused by train vibration load,incomplete consolidation deformation of foundation soil during tunnel construction,dense buildings and structures in the vicinity of the tunnel,and changes in water level in the stratum where the tunnel is located.The monitoring of long-term land subsidence during subway operation in high-density urban areas differs from that in low-density urban construction areas.The former is the gathering point of the entire urban population.There are many complex buildings around the project,busy road traffic,high pedestrian flow,and less vegetation cover.Several existing items requiremonitoring.However,monitoring distance is long,and providing early warning is difficult.This study uses the 2.8 km operation line between Wulin Square station and Ding’an Road station of Hangzhou Subway Line 1 as an example to propose the integrated method of DInSAR-GPS-GIS technology and the key algorithm for long-term land subsidence deformation.Then,it selects multiscene image data to analyze long-termland subsidence of high-density urban areas during subway operation.Results show that long-term land subsidence caused by the operation of Wulin Square station to Ding’an Road station of Hangzhou Subway Line 1 is small,with maximumsubsidence of 30.64 mm,and minimumsubsidence of 11.45 mm,and average subsidence ranging from 19.27 to 21.33 mm.And FLAC3D software was used to verify the monitoring situation,using the geological conditions of the soil in the study area and the tunnel profile to simulate the settlement under vehicle load,and the simulation results tended to be consistent with the monitoring situation.展开更多
This research focuses on the seismic responses of the historic masonry minarets,conducted through the creation of a digital twin model using finite element methods.The study initiated the development of a comprehensiv...This research focuses on the seismic responses of the historic masonry minarets,conducted through the creation of a digital twin model using finite element methods.The study initiated the development of a comprehensive model in the ANSYS Workbench,supplemented by operational modal analysis(OMA),to ascertain the dynamic characteristics of the minaret.The alignment of numerical and experimental frequency data was achieved using the response surface method(RSM)within ANSYS Workbench DesignXplorer.This process resulted in the establishment of a digital twin,accurately representing the physical minaret in a virtual environment.Blender^(■)software was then used to simulate the effects of two consecutive earthquakes in Türkiye that occurred on February 6,2023.The simulations highlighted the heightened susceptibility of the minaret,especially in its upper sections,to consecutive seismic activities,culminating in significant damage and collapse.This innovative approach,merging traditional engineering methods with a cutting-edge digital simulation,provides a profound insight into the seismic behavior of historical structures.The research underscores the importance of advanced seismic modeling for the effective preservation and resilience of architectural heritage sites against earthquake risks.展开更多
Metal-oxide-semiconductor field effect transistor(MOSFET) intrinsic gain degradation caused by channel length modulation(CLM) effect is examined.A simplified model based on Berkeley short-channel insulator-gate field ...Metal-oxide-semiconductor field effect transistor(MOSFET) intrinsic gain degradation caused by channel length modulation(CLM) effect is examined.A simplified model based on Berkeley short-channel insulator-gate field effect transistor model version 4(BSIM4) current expression for sub-100 nm MOSFET intrinsic gain is deduced,which only needs a few technology parameters.With this transistor intrinsic gain model,complementary metal-oxide-semiconductor(CMOS) operational amplifier(op amp) DC gain could be predicted.A two-stage folded cascode op amp is used as an example in this work.Non-minimum length device is used to improve the op amp DC gain.An improvement of 20 dB is proved when using doubled channel length design.Optimizing transistor bias condition and using advanced technology with thinner gate dielectric thickness and shallower source/drain junction depth can also increase the op amp DC gain.After these,a full op amp DC gain scaling roadmap is proposed,from 130 nm technology node to 32 nm technology node.Five scaled op amps are built and their DC gains in simulation roll down from 69.6 to 41.1 dB.Simulation shows transistors biased at higher source-drain voltage will have more impact on the op amp DC gain scaling over technology.The prediction based on our simplified gain model agrees with SPICE simulation results.展开更多
[目的]比较传统手术与应用3D打印技术后手术治疗复杂胫骨平台骨折的临床疗效。[方法]回顾性分析本院2009年3月~2014年7月收治的73例复杂的胫骨平台骨折的患者资料,男51例,女22例,年龄19~57岁,平均38.2岁,骨折按照Schazker分型：Ⅳ型33...[目的]比较传统手术与应用3D打印技术后手术治疗复杂胫骨平台骨折的临床疗效。[方法]回顾性分析本院2009年3月~2014年7月收治的73例复杂的胫骨平台骨折的患者资料,男51例,女22例,年龄19~57岁,平均38.2岁,骨折按照Schazker分型：Ⅳ型33例、Ⅴ型24例、Ⅵ型16例;按照CT分型：双柱骨折51例,三柱骨折22例。其中19例术前采用三维CT重建,3D技术打印实体模型,并在3D模型上模拟手术,术中按术前计划手术（3D技术组）。54例行常规CT扫描、术前准备及手术（常规组）。记录两组患者手术时间、术中出血量、骨折复位质量、手术并发症发生率,术后12个月按照HSS标准进行膝关节功能评分。[结果]所有患者均进行12个月~4年随访（平均24个月）。与常规组相比较,3D技术组手术时间缩短,术中出血量减少,术后12个月膝关节功能HSS评分高,两组间差异有统计学意义（P〈0.05）;术后第2 d拍膝关节X线片,3D组：解剖复位17例,移位〈1 mm 1例,移位〉1 mm 1例,解剖复位率89.4%;常规组：解剖复位35例,移位〈1 mm 15例,移位〉1 mm4例,解剖复位率64.8%,两组间比较差异有统计学意义（P〈0.05）;3D技术组与常规组分别出现创伤性关节炎1例、3例;关节僵直0例、2例;关节不稳1例、3例;下肢深静脉血栓形成0例、1例,两组间比较差异无统计学意义（P〉0.05）。[结论]3D打印技术治疗复杂胫骨平台骨折,可降低手术时间,减少手术出血量,提高骨折复位质量,有效恢复膝关节功能,具有明显的优势。展开更多
基金financial supports for this research project by the National Natural Science Foundation of China(Nos.41602308,41967037)supported by Zhejiang Provincial Natural Science Foundation of China under Grant No.LY20E080005+1 种基金funded by National Key Research and Development Projects of China(No.2019YFC507502)Guangxi Science and Technology Plan Project(No.RZ2100000161).
文摘During subway operation,various factors will cause long-term land subsidence,such as the vibration subsidence of foundation soil caused by train vibration load,incomplete consolidation deformation of foundation soil during tunnel construction,dense buildings and structures in the vicinity of the tunnel,and changes in water level in the stratum where the tunnel is located.The monitoring of long-term land subsidence during subway operation in high-density urban areas differs from that in low-density urban construction areas.The former is the gathering point of the entire urban population.There are many complex buildings around the project,busy road traffic,high pedestrian flow,and less vegetation cover.Several existing items requiremonitoring.However,monitoring distance is long,and providing early warning is difficult.This study uses the 2.8 km operation line between Wulin Square station and Ding’an Road station of Hangzhou Subway Line 1 as an example to propose the integrated method of DInSAR-GPS-GIS technology and the key algorithm for long-term land subsidence deformation.Then,it selects multiscene image data to analyze long-termland subsidence of high-density urban areas during subway operation.Results show that long-term land subsidence caused by the operation of Wulin Square station to Ding’an Road station of Hangzhou Subway Line 1 is small,with maximumsubsidence of 30.64 mm,and minimumsubsidence of 11.45 mm,and average subsidence ranging from 19.27 to 21.33 mm.And FLAC3D software was used to verify the monitoring situation,using the geological conditions of the soil in the study area and the tunnel profile to simulate the settlement under vehicle load,and the simulation results tended to be consistent with the monitoring situation.
基金product of the research project titled,Video Camera Based Structural Health Monitoring of Historic Masonry Minarets and Development of a Long-Term Decision-Making Model Based on Deep Learning Method(Project No.222M140)supported by TÜBİTAK 1001-Scientific and the Technological Research Projects Support Program.
文摘This research focuses on the seismic responses of the historic masonry minarets,conducted through the creation of a digital twin model using finite element methods.The study initiated the development of a comprehensive model in the ANSYS Workbench,supplemented by operational modal analysis(OMA),to ascertain the dynamic characteristics of the minaret.The alignment of numerical and experimental frequency data was achieved using the response surface method(RSM)within ANSYS Workbench DesignXplorer.This process resulted in the establishment of a digital twin,accurately representing the physical minaret in a virtual environment.Blender^(■)software was then used to simulate the effects of two consecutive earthquakes in Türkiye that occurred on February 6,2023.The simulations highlighted the heightened susceptibility of the minaret,especially in its upper sections,to consecutive seismic activities,culminating in significant damage and collapse.This innovative approach,merging traditional engineering methods with a cutting-edge digital simulation,provides a profound insight into the seismic behavior of historical structures.The research underscores the importance of advanced seismic modeling for the effective preservation and resilience of architectural heritage sites against earthquake risks.
文摘Metal-oxide-semiconductor field effect transistor(MOSFET) intrinsic gain degradation caused by channel length modulation(CLM) effect is examined.A simplified model based on Berkeley short-channel insulator-gate field effect transistor model version 4(BSIM4) current expression for sub-100 nm MOSFET intrinsic gain is deduced,which only needs a few technology parameters.With this transistor intrinsic gain model,complementary metal-oxide-semiconductor(CMOS) operational amplifier(op amp) DC gain could be predicted.A two-stage folded cascode op amp is used as an example in this work.Non-minimum length device is used to improve the op amp DC gain.An improvement of 20 dB is proved when using doubled channel length design.Optimizing transistor bias condition and using advanced technology with thinner gate dielectric thickness and shallower source/drain junction depth can also increase the op amp DC gain.After these,a full op amp DC gain scaling roadmap is proposed,from 130 nm technology node to 32 nm technology node.Five scaled op amps are built and their DC gains in simulation roll down from 69.6 to 41.1 dB.Simulation shows transistors biased at higher source-drain voltage will have more impact on the op amp DC gain scaling over technology.The prediction based on our simplified gain model agrees with SPICE simulation results.
文摘[目的]比较传统手术与应用3D打印技术后手术治疗复杂胫骨平台骨折的临床疗效。[方法]回顾性分析本院2009年3月~2014年7月收治的73例复杂的胫骨平台骨折的患者资料,男51例,女22例,年龄19~57岁,平均38.2岁,骨折按照Schazker分型：Ⅳ型33例、Ⅴ型24例、Ⅵ型16例;按照CT分型：双柱骨折51例,三柱骨折22例。其中19例术前采用三维CT重建,3D技术打印实体模型,并在3D模型上模拟手术,术中按术前计划手术（3D技术组）。54例行常规CT扫描、术前准备及手术（常规组）。记录两组患者手术时间、术中出血量、骨折复位质量、手术并发症发生率,术后12个月按照HSS标准进行膝关节功能评分。[结果]所有患者均进行12个月~4年随访（平均24个月）。与常规组相比较,3D技术组手术时间缩短,术中出血量减少,术后12个月膝关节功能HSS评分高,两组间差异有统计学意义（P〈0.05）;术后第2 d拍膝关节X线片,3D组：解剖复位17例,移位〈1 mm 1例,移位〉1 mm 1例,解剖复位率89.4%;常规组：解剖复位35例,移位〈1 mm 15例,移位〉1 mm4例,解剖复位率64.8%,两组间比较差异有统计学意义（P〈0.05）;3D技术组与常规组分别出现创伤性关节炎1例、3例;关节僵直0例、2例;关节不稳1例、3例;下肢深静脉血栓形成0例、1例,两组间比较差异无统计学意义（P〉0.05）。[结论]3D打印技术治疗复杂胫骨平台骨折,可降低手术时间,减少手术出血量,提高骨折复位质量,有效恢复膝关节功能,具有明显的优势。
