采用模型试验方法,对多层互剪搅拌桩工法(contra-rotational shear deep soil mixing,简称CS-DSM工法)的工艺因素进行了试验研究,探索了水泥掺量、单位桩长搅拌次数T、单位体积搅拌能量E以及内外钻杆转速比RN等工艺因素对搅拌桩均匀性...采用模型试验方法,对多层互剪搅拌桩工法(contra-rotational shear deep soil mixing,简称CS-DSM工法)的工艺因素进行了试验研究,探索了水泥掺量、单位桩长搅拌次数T、单位体积搅拌能量E以及内外钻杆转速比RN等工艺因素对搅拌桩均匀性与强度UCS的影响。模型试验研究发现,通过多层互剪搅拌能够根除地表冒浆、防止糊钻抱钻、提高固化材料利用率。18组模型试验结果阐明搅拌桩在T-E-UCS之间存在固有关联,并揭示出机械参数、输出能量与桩身强度之间的本质关系。提供的计算方法可以定性指导选取合理的工艺参数,实现桩身设计强度目标。作为重要工艺因素,内外钻杆转速比RN与桩身强度试验曲线存在极值点,建议在工程中将1.80~2.20作为获取桩身峰值强度的最优RN值域。CS-DSM工法应用的系列研究结果为高质量搅拌桩工艺控制原则和质量保障体系提供了试验依据。展开更多
Supercapacitor has been widely known as a representative electrochemical energy storage device with high power density and long lifespan.Recently,with the deeper understanding of its charge storage mechanism,unidirect...Supercapacitor has been widely known as a representative electrochemical energy storage device with high power density and long lifespan.Recently,with the deeper understanding of its charge storage mechanism,unidirectional-charging supercapacitor,also called supercapacitor diode(CAPode),is successfully developed based on the ion-sieving effect of its working electrode towards electrolyte ions.Because CAPode integrates mobile ion and mobile electron in one hybrid circuit,it has a great potential in the emerging fields of ion/electron coupling logic operations,human–machine interface,neural network interaction,and in vivo diagnosis and treatment.Accordingly,we herein elucidate the working mechanism and design philosophy of CAPode,and summarize the electrode materials that are suitable for constructing CAPode.Meanwhile,some other supercapacitor-based devices beyond CAPode are also introduced,and their potential applications are instructively presented.Finally,we outline the challenges and chances of CAPode-related techniques.展开更多
共同基金选择是资产配置关注的重要问题之一。本文提出了基金网络下的共同基金选择模型,该模型将基金重仓持股的网络权重矩阵作为惩罚项引入参数估计中,能够限定彼此相连基金的业绩alpha(α)的差异。在此基础上,本文评估了基金网络对基...共同基金选择是资产配置关注的重要问题之一。本文提出了基金网络下的共同基金选择模型,该模型将基金重仓持股的网络权重矩阵作为惩罚项引入参数估计中,能够限定彼此相连基金的业绩alpha(α)的差异。在此基础上,本文评估了基金网络对基金业绩的影响,并结合错误发现率(FDR)方法提出了基于网络调整的共同基金选择策略。实证采用中国2016年1月至2020年12月的596只共同基金数据样本进行分析,研究发现:①近5年中国基金的持股具有高度重合度,使得基金业绩之间存在较高的关联性;②基金网络与基金业绩之间存在“马太效应”,即基金网络对正α基金存在正向作用,而对负α基金存在负向作用;③通过与其他基金选择方法做对比,本文提出的基于网络调整的共同基金选择模型能够有效地剔除基金网络对基金业绩的影响,选出真正具有选股能力的基金。本文结果不仅可为基金间的共同持股行为提供新的解释,还可为投资者或Fund of Funds(FOF)基金经理的投资决策提供新的视角。展开更多
Tissue culture and rapid propagation of shoot tips and stem segments of Trichosanthes kirilowii Maxim.were investigated.The results showed that bettermedium for inducing andmultiplication of callus was MS medium conta...Tissue culture and rapid propagation of shoot tips and stem segments of Trichosanthes kirilowii Maxim.were investigated.The results showed that bettermedium for inducing andmultiplication of callus was MS medium containing 0.5 mg·L-16-BA and 0.4 mg·L-1NAA.Suitable medium for inducing tufted-buds was MS medium containing 4.0 mg·L-1 6-BA and 0.2 mg·L-1 NAA.The best medium for rooting was MS medium containing 0.1 mg·L-1 NAA,with a rooting rate of 100%.展开更多
文摘采用模型试验方法,对多层互剪搅拌桩工法(contra-rotational shear deep soil mixing,简称CS-DSM工法)的工艺因素进行了试验研究,探索了水泥掺量、单位桩长搅拌次数T、单位体积搅拌能量E以及内外钻杆转速比RN等工艺因素对搅拌桩均匀性与强度UCS的影响。模型试验研究发现,通过多层互剪搅拌能够根除地表冒浆、防止糊钻抱钻、提高固化材料利用率。18组模型试验结果阐明搅拌桩在T-E-UCS之间存在固有关联,并揭示出机械参数、输出能量与桩身强度之间的本质关系。提供的计算方法可以定性指导选取合理的工艺参数,实现桩身设计强度目标。作为重要工艺因素,内外钻杆转速比RN与桩身强度试验曲线存在极值点,建议在工程中将1.80~2.20作为获取桩身峰值强度的最优RN值域。CS-DSM工法应用的系列研究结果为高质量搅拌桩工艺控制原则和质量保障体系提供了试验依据。
基金We acknowledge the financial support from the China Postdoctoral Science Foundation(Grant Nos.BX20220139 and 2021M701530)the National Natural Science Foundation of China(Grant No.61874166)+1 种基金the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2021-sp50)the Science and Technology Program of Qinghai Province(Grant No.2022-ZJ-703).
文摘Supercapacitor has been widely known as a representative electrochemical energy storage device with high power density and long lifespan.Recently,with the deeper understanding of its charge storage mechanism,unidirectional-charging supercapacitor,also called supercapacitor diode(CAPode),is successfully developed based on the ion-sieving effect of its working electrode towards electrolyte ions.Because CAPode integrates mobile ion and mobile electron in one hybrid circuit,it has a great potential in the emerging fields of ion/electron coupling logic operations,human–machine interface,neural network interaction,and in vivo diagnosis and treatment.Accordingly,we herein elucidate the working mechanism and design philosophy of CAPode,and summarize the electrode materials that are suitable for constructing CAPode.Meanwhile,some other supercapacitor-based devices beyond CAPode are also introduced,and their potential applications are instructively presented.Finally,we outline the challenges and chances of CAPode-related techniques.
文摘共同基金选择是资产配置关注的重要问题之一。本文提出了基金网络下的共同基金选择模型,该模型将基金重仓持股的网络权重矩阵作为惩罚项引入参数估计中,能够限定彼此相连基金的业绩alpha(α)的差异。在此基础上,本文评估了基金网络对基金业绩的影响,并结合错误发现率(FDR)方法提出了基于网络调整的共同基金选择策略。实证采用中国2016年1月至2020年12月的596只共同基金数据样本进行分析,研究发现:①近5年中国基金的持股具有高度重合度,使得基金业绩之间存在较高的关联性;②基金网络与基金业绩之间存在“马太效应”,即基金网络对正α基金存在正向作用,而对负α基金存在负向作用;③通过与其他基金选择方法做对比,本文提出的基于网络调整的共同基金选择模型能够有效地剔除基金网络对基金业绩的影响,选出真正具有选股能力的基金。本文结果不仅可为基金间的共同持股行为提供新的解释,还可为投资者或Fund of Funds(FOF)基金经理的投资决策提供新的视角。
文摘Tissue culture and rapid propagation of shoot tips and stem segments of Trichosanthes kirilowii Maxim.were investigated.The results showed that bettermedium for inducing andmultiplication of callus was MS medium containing 0.5 mg·L-16-BA and 0.4 mg·L-1NAA.Suitable medium for inducing tufted-buds was MS medium containing 4.0 mg·L-1 6-BA and 0.2 mg·L-1 NAA.The best medium for rooting was MS medium containing 0.1 mg·L-1 NAA,with a rooting rate of 100%.
