目的研究温度对Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂微渗漏的影响,为临床选择较理想的流体树脂提供参考。方法选取因正畸拔除的成人离体前磨牙60颗,随机分为10组(n=12),根...目的研究温度对Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂微渗漏的影响,为临床选择较理想的流体树脂提供参考。方法选取因正畸拔除的成人离体前磨牙60颗,随机分为10组(n=12),根据是否经过冷热循环老化实验,分为F00A组、Z350A组、SDRA组、TetricA组、ConsticA组,F00B组、Z350B组、SDRB组、TetricB组、ConsticB组,共10组。每颗离体牙咬合面预备成宽2 mm、长4 mm、深2 mm的Ⅰ类洞,分别用所属组别流体树脂充填,A组试件亚甲基蓝染色实验,B组试件先进行5000次冷热循环老化实验后再进行亚甲基蓝染色实验,之后将所有试件牙冠部沿颊舌(腭)方向平行于牙体长轴纵向剖开,体视显微镜下观察各组微渗漏情况,记录数据并分析。结果①F00A组、Z350A组、SDRA组、TetricA组、ConsticA组5组微渗漏的差异并没有统计学意义(P>0.05)。②SDRB组、TetricB组的微渗漏程度大于F00B组、Z350B组,差异具有统计学意义(P<0.05)。③温度对Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂之间的微渗漏程度影响有显著差异(P<0.05)。结论①未经过冷热循环老化实验时,Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂的即刻微渗漏程度无明显差异。②经过冷热循环老化实验后,SDR流体树脂、Tetric^(®)N⁃Flow流体树脂微渗漏程度较高,边缘密合性不佳;Beautifil Flow Plus F00流体树脂、Filtek^(TM)Z350 XT流体树脂微渗漏程度较低,边缘密合性较优。③冷热循环老化实验加重了Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂的微渗漏程度。展开更多
In this paper, the efficient utilization of liquefied natural gas(LNG) vaporization cold energy in offshore liquefied natural gas floating storage regasification unit(FSRU) is studied. On the basis of considering diff...In this paper, the efficient utilization of liquefied natural gas(LNG) vaporization cold energy in offshore liquefied natural gas floating storage regasification unit(FSRU) is studied. On the basis of considering different boil-off gas(BOG) practical treatment processes, a cascade comprehensive utilization scheme of cold energy of LNG based on the longitudinal three-stage organic Rankine cycle power generation and the low-grade cold energy used to frozen seawater desalination was proposed. Through the comparative analysis of the effects of the pure working fluid and eight mixed working fluids on the performance of the new system, the combination scheme of system mixed working fluid with the highest exergy efficiency of the system was determined. Then, the genetic algorithm was used to optimize the parameters of the new system. After optimization, the net output power of the LNG cold energy comprehensive utilization system proposed in this paper was 5186 kW, and the exergy efficiency is 30.6%. Considering the power generation and freshwater revenue, the annual economic benefit of the system operating is 18.71 million CNY.展开更多
The microscopic observation of directional crystallization of transparent organic melt of mixed dichlorobenzene (DCB) is made to study the interface morphology of growing crystal, the pattern of crystal growth and the...The microscopic observation of directional crystallization of transparent organic melt of mixed dichlorobenzene (DCB) is made to study the interface morphology of growing crystal, the pattern of crystal growth and the cause of impurity inclusion. The results of microscopic observation will provide great benefit to the theoretical and numerical studies of related directional crystallization process.展开更多
文摘目的研究温度对Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂微渗漏的影响,为临床选择较理想的流体树脂提供参考。方法选取因正畸拔除的成人离体前磨牙60颗,随机分为10组(n=12),根据是否经过冷热循环老化实验,分为F00A组、Z350A组、SDRA组、TetricA组、ConsticA组,F00B组、Z350B组、SDRB组、TetricB组、ConsticB组,共10组。每颗离体牙咬合面预备成宽2 mm、长4 mm、深2 mm的Ⅰ类洞,分别用所属组别流体树脂充填,A组试件亚甲基蓝染色实验,B组试件先进行5000次冷热循环老化实验后再进行亚甲基蓝染色实验,之后将所有试件牙冠部沿颊舌(腭)方向平行于牙体长轴纵向剖开,体视显微镜下观察各组微渗漏情况,记录数据并分析。结果①F00A组、Z350A组、SDRA组、TetricA组、ConsticA组5组微渗漏的差异并没有统计学意义(P>0.05)。②SDRB组、TetricB组的微渗漏程度大于F00B组、Z350B组,差异具有统计学意义(P<0.05)。③温度对Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂之间的微渗漏程度影响有显著差异(P<0.05)。结论①未经过冷热循环老化实验时,Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂的即刻微渗漏程度无明显差异。②经过冷热循环老化实验后,SDR流体树脂、Tetric^(®)N⁃Flow流体树脂微渗漏程度较高,边缘密合性不佳;Beautifil Flow Plus F00流体树脂、Filtek^(TM)Z350 XT流体树脂微渗漏程度较低,边缘密合性较优。③冷热循环老化实验加重了Beautifil Flow Plus F00、Filtek^(TM)Z350 XT、SDR、Tetric^(®)N⁃Flow、Constic这5种流体树脂的微渗漏程度。
基金supported by special project of R&D and industrialization of Marine equipment of national development and reform commission of China(National Development and Reform Commission High Technology[2015]No.1409)。
文摘In this paper, the efficient utilization of liquefied natural gas(LNG) vaporization cold energy in offshore liquefied natural gas floating storage regasification unit(FSRU) is studied. On the basis of considering different boil-off gas(BOG) practical treatment processes, a cascade comprehensive utilization scheme of cold energy of LNG based on the longitudinal three-stage organic Rankine cycle power generation and the low-grade cold energy used to frozen seawater desalination was proposed. Through the comparative analysis of the effects of the pure working fluid and eight mixed working fluids on the performance of the new system, the combination scheme of system mixed working fluid with the highest exergy efficiency of the system was determined. Then, the genetic algorithm was used to optimize the parameters of the new system. After optimization, the net output power of the LNG cold energy comprehensive utilization system proposed in this paper was 5186 kW, and the exergy efficiency is 30.6%. Considering the power generation and freshwater revenue, the annual economic benefit of the system operating is 18.71 million CNY.
文摘The microscopic observation of directional crystallization of transparent organic melt of mixed dichlorobenzene (DCB) is made to study the interface morphology of growing crystal, the pattern of crystal growth and the cause of impurity inclusion. The results of microscopic observation will provide great benefit to the theoretical and numerical studies of related directional crystallization process.
