目的:探究观察3M Single Bond Universal粘接系统对前牙E-max铸瓷贴面修复的远期疗效。方法:选择2017年5月-2019年5月笔者医院收治的需前牙E-max铸瓷贴面修复患者63例(患牙113颗)为研究对象,均行经典贴面修复,根据粘接系统的不同将患者...目的:探究观察3M Single Bond Universal粘接系统对前牙E-max铸瓷贴面修复的远期疗效。方法:选择2017年5月-2019年5月笔者医院收治的需前牙E-max铸瓷贴面修复患者63例(患牙113颗)为研究对象,均行经典贴面修复,根据粘接系统的不同将患者分为观察组(患者21例,患牙40颗,采用3M Single Bond Universal粘接系统)、对照1组(患者21例,患牙36颗,采用VariolinkⅡ粘接系统)、对照2组(患者21例,患牙37颗,采用BISCO CHOICE 2粘接系统)。治疗后三组均于1周、3个月、12个月时进行随访,观察三组治疗后1周、3个月、12个月内贴面修复效果、贴面修复失败率及不良反应发生率。结果:术后1周,三组患者均无失败案例;对照1组存在2颗修复体保存完整度为Ⅰ级的患牙,对照2组存在3颗修复体保存完整度为I级的患牙,观察组未存在该类患者;术后12个月,观察组存在1颗修复体保存完整度Ⅱ级患牙,对照1组存在1颗保存完整度I级患牙,3颗修复体保存完整度Ⅱ级患牙,对照2组存在2颗保存完整度I级患牙,3颗修复体保存完整度Ⅱ级患牙。三组患者治疗效果比较,差异无统计学意义(P>0.05);术后1周、3个月、12个月三组贴面修复失败率比较,差异无统计学意义(P>0.05);随访期间内,三组患者不良反应情况比较差异均无统计学意义(P>0.05)。结论:对于前牙E-max铸瓷贴面修复患者,选取合适的适应证,并做好备牙步骤,3M Single Bond Universal与经典VariolinkⅡ粘接系统及BISCO CHOICE 2粘接系统治疗效果并无显著差异,值得在临床推广使用。展开更多
In view of the current sensors failure in electric pitch system,a variable universe fuzzy fault tolerant control method of electric pitch control system based on single current detection is proposed.When there is sing...In view of the current sensors failure in electric pitch system,a variable universe fuzzy fault tolerant control method of electric pitch control system based on single current detection is proposed.When there is single or two-current sensor fault occurs,based on the proposed method the missing current information can be reconstructed by using direct current（DC）bus current sensor and the three-phase current can be updated in time within any two adjacent sampling periods,so as to ensure stability of the closed-loop system.And then the switchover and fault tolerant control of fault current sensor would be accomplished by fault diagnosis method based on adaptive threshold judgment.For the reconstructed signal error caused by the modulation method and the main control target of electric pitch system,a variable universe fuzzy control method is used in the speed loop,which can improve the anti-disturbance ability to load variation,and the robustness of fault tolerance system.The results show that the fault tolerant control method makes the variable pitch control system still has ideal control characteristics in case of sensor failure although part of the system performance is lost,thus the correctness of the proposed method is verified.展开更多
A model for an excited-atom coupled leaky cavity in single-photon generation is proposed based on universal modes. Solvable motion equations of the atomic operators are obtained under the single-photon condition by ad...A model for an excited-atom coupled leaky cavity in single-photon generation is proposed based on universal modes. Solvable motion equations of the atomic operators are obtained under the single-photon condition by adopting the Lorentzian line type of the universal modes.展开更多
Hydrogen release through water splitting is essential for reducing carbon emissions and promoting the hydrogen economy.One of the crucial challenges for industrial applications of water electrolysis is the manufacture...Hydrogen release through water splitting is essential for reducing carbon emissions and promoting the hydrogen economy.One of the crucial challenges for industrial applications of water electrolysis is the manufacture of electrocatalysts which can reduce the kinetic energy barrier of the hydrogen evolution reaction(HER).Loading transition metal(TM)nanoparticles(NPs)or single atoms(SAs)into heteroatom-doped carbon materials(HCMs)is an effective method to improve electrochemical activity and stability.To this end,we synthesized N-doped porous carbon(NC)encapsulated Co NPs and isolated Co SA nanocatalysts(denoted as Co NPs@SAs-NC)using metal-organic frameworks(MOFs)as sacrificial precursors.The Co NPs@SAs-NC nanocatalysts displayed outstanding HER activity with a 110 mV overpotential in 1 M KOH,47 mV overpotential in 0.5 M H2SO4 and 171 mV in 0.5 M phosphate-buffered saline(PBS)to reach a current density of 10 mA·cm^(−2).In addition,the mechanism of the synergistic effect of Co NPs,Co SAs and N species was investigated in-depth using in situ shielding experiments and density functional theory(DFT)calculations.展开更多
文摘目的:探究观察3M Single Bond Universal粘接系统对前牙E-max铸瓷贴面修复的远期疗效。方法:选择2017年5月-2019年5月笔者医院收治的需前牙E-max铸瓷贴面修复患者63例(患牙113颗)为研究对象,均行经典贴面修复,根据粘接系统的不同将患者分为观察组(患者21例,患牙40颗,采用3M Single Bond Universal粘接系统)、对照1组(患者21例,患牙36颗,采用VariolinkⅡ粘接系统)、对照2组(患者21例,患牙37颗,采用BISCO CHOICE 2粘接系统)。治疗后三组均于1周、3个月、12个月时进行随访,观察三组治疗后1周、3个月、12个月内贴面修复效果、贴面修复失败率及不良反应发生率。结果:术后1周,三组患者均无失败案例;对照1组存在2颗修复体保存完整度为Ⅰ级的患牙,对照2组存在3颗修复体保存完整度为I级的患牙,观察组未存在该类患者;术后12个月,观察组存在1颗修复体保存完整度Ⅱ级患牙,对照1组存在1颗保存完整度I级患牙,3颗修复体保存完整度Ⅱ级患牙,对照2组存在2颗保存完整度I级患牙,3颗修复体保存完整度Ⅱ级患牙。三组患者治疗效果比较,差异无统计学意义(P>0.05);术后1周、3个月、12个月三组贴面修复失败率比较,差异无统计学意义(P>0.05);随访期间内,三组患者不良反应情况比较差异均无统计学意义(P>0.05)。结论:对于前牙E-max铸瓷贴面修复患者,选取合适的适应证,并做好备牙步骤,3M Single Bond Universal与经典VariolinkⅡ粘接系统及BISCO CHOICE 2粘接系统治疗效果并无显著差异,值得在临床推广使用。
基金Natural Science Foundation of Gansu Province(Joint)Project(No.213244)Natural Science Foundation of Gansu Province(No.145RJZA136)Youth Science Foundation of Lanzhou Jiaotong University(No.2013040)
文摘In view of the current sensors failure in electric pitch system,a variable universe fuzzy fault tolerant control method of electric pitch control system based on single current detection is proposed.When there is single or two-current sensor fault occurs,based on the proposed method the missing current information can be reconstructed by using direct current（DC）bus current sensor and the three-phase current can be updated in time within any two adjacent sampling periods,so as to ensure stability of the closed-loop system.And then the switchover and fault tolerant control of fault current sensor would be accomplished by fault diagnosis method based on adaptive threshold judgment.For the reconstructed signal error caused by the modulation method and the main control target of electric pitch system,a variable universe fuzzy control method is used in the speed loop,which can improve the anti-disturbance ability to load variation,and the robustness of fault tolerance system.The results show that the fault tolerant control method makes the variable pitch control system still has ideal control characteristics in case of sensor failure although part of the system performance is lost,thus the correctness of the proposed method is verified.
文摘A model for an excited-atom coupled leaky cavity in single-photon generation is proposed based on universal modes. Solvable motion equations of the atomic operators are obtained under the single-photon condition by adopting the Lorentzian line type of the universal modes.
基金the National Key Research and Development Program of China(No.2017YFB0403401)the China Postdoctoral Science Foundation(Nos.2021M691759,and 2021TQ0169)Beijing Natural Science Foundation(No.2224103)。
文摘Hydrogen release through water splitting is essential for reducing carbon emissions and promoting the hydrogen economy.One of the crucial challenges for industrial applications of water electrolysis is the manufacture of electrocatalysts which can reduce the kinetic energy barrier of the hydrogen evolution reaction(HER).Loading transition metal(TM)nanoparticles(NPs)or single atoms(SAs)into heteroatom-doped carbon materials(HCMs)is an effective method to improve electrochemical activity and stability.To this end,we synthesized N-doped porous carbon(NC)encapsulated Co NPs and isolated Co SA nanocatalysts(denoted as Co NPs@SAs-NC)using metal-organic frameworks(MOFs)as sacrificial precursors.The Co NPs@SAs-NC nanocatalysts displayed outstanding HER activity with a 110 mV overpotential in 1 M KOH,47 mV overpotential in 0.5 M H2SO4 and 171 mV in 0.5 M phosphate-buffered saline(PBS)to reach a current density of 10 mA·cm^(−2).In addition,the mechanism of the synergistic effect of Co NPs,Co SAs and N species was investigated in-depth using in situ shielding experiments and density functional theory(DFT)calculations.
