目的:评价水湿粘结和乙醇湿粘结操作技术对即刻粘结强度和粘结耐久性的影响。方法:利用乙醇湿粘结、水湿粘结技术和全酸蚀粘结系统Single Bond 2(SB)以及Prime Bond NT(PB)制备牙本质片粘结试件。微拉伸实验检测即刻粘结强度;并测试老...目的:评价水湿粘结和乙醇湿粘结操作技术对即刻粘结强度和粘结耐久性的影响。方法:利用乙醇湿粘结、水湿粘结技术和全酸蚀粘结系统Single Bond 2(SB)以及Prime Bond NT(PB)制备牙本质片粘结试件。微拉伸实验检测即刻粘结强度;并测试老化处理(100 g/L次氯酸钠液浸泡2 h)后的粘结强度,扫描电镜观察各组杂化层的微观形貌。每项实验用5个粘结试件。结果:与水湿粘结技术相比,乙醇湿粘结技术可获得与PB组相似(P>0.05)或者比SB组更高(P<0.05)的即刻粘结强度;老化处理后的粘结强度显著高于相应的水湿粘结组(SB组和PB组)(P<0.05);乙醇湿粘结试件的杂化层清晰完整、质地均一。结论:乙醇湿粘结技术可提高全酸蚀粘结剂的牙本质粘结强度和粘结耐久性,获得界限明确、质地均一的杂化层。展开更多
The first-principles method based on the projector augmented wave method within the generalized gradient approximation was employed to calculate the superlattice intrinsic stacking fault（SISF） and complex stacking f...The first-principles method based on the projector augmented wave method within the generalized gradient approximation was employed to calculate the superlattice intrinsic stacking fault（SISF） and complex stacking fault（CSF） energies of the binary Ni3Al alloys with different Al contents and the ternary Ni3Al intermetallic alloys with addition of alloying elements,such as Pd,Pt,Ti,Mo,Ta,W and Re.The results show that the energies of SISF and CSF increase significantly with increase of Al contents in Ni3Al.Addition of Pd and Pt occupying the Ni sublattices does not change the SISF and CSF energies of Ni3Al markedly in comparison with the Ni-23.75Al alloy.While addition of alloying elements,such as Ti,Mo,Ta,W and Re,occupying the Al sublattices dramatically increases the SISF and CSF energies of Ni3Al.The results suggest that the energies of SISF and CSF are dependent both on the Al contents and on the site occupancy of the ternary alloying element in Ni3Al intermetallic alloys.展开更多
CuI thin films with nano-scale grains of about 35nm were deposited via spraying method with using acetonitrile as solvent. The influence of iodine doping concentration in acetonitrile solution on the structure, topogr...CuI thin films with nano-scale grains of about 35nm were deposited via spraying method with using acetonitrile as solvent. The influence of iodine doping concentration in acetonitrile solution on the structure, topographic and optical properties of CuI thin films was investigated. X-ray diffraction results showed that CuI iodine-doped films doped CuI：I2 were in γ-phase of zinc blende structure with （111） preferential plane. Scanning electron microscopy revealed that the microstructure of CuI films depended on the relative amount of doping iodine in the solution. When the iodine doping amount in acetonitrile solution was 0.025 g, the film was uniform and compact, the optical transmittance was 75.4% in the part of visible region and the energy band gap was close to 2.96 eV.展开更多
A model is proposed to evaluate the,effective modufi of a composite reinforced by two-layered spherical inclusions.This model is based on the localisation problem of a two- layered spherical inclusion embedded in an i...A model is proposed to evaluate the,effective modufi of a composite reinforced by two-layered spherical inclusions.This model is based on the localisation problem of a two- layered spherical inclusion embedded in an infinite matrix.The interations of the reinforced phases are taken into account by using the average matrix stress concept.When the external layer vanishes,the proposed model reduces to the classical Mori-Tanaka's model for spherical inclusions.Theoretical results for the composite of polyester matrix filled by hollow glass spheres and voids show excellent agreement with experimental results.展开更多
基金Supported by National Natural Science Foundation of China(61574098,61204051)International Cooperation Program for Excellent Lecturers of 2015 of Shandong Provincial Education Department~~
文摘目的:评价水湿粘结和乙醇湿粘结操作技术对即刻粘结强度和粘结耐久性的影响。方法:利用乙醇湿粘结、水湿粘结技术和全酸蚀粘结系统Single Bond 2(SB)以及Prime Bond NT(PB)制备牙本质片粘结试件。微拉伸实验检测即刻粘结强度;并测试老化处理(100 g/L次氯酸钠液浸泡2 h)后的粘结强度,扫描电镜观察各组杂化层的微观形貌。每项实验用5个粘结试件。结果:与水湿粘结技术相比,乙醇湿粘结技术可获得与PB组相似(P>0.05)或者比SB组更高(P<0.05)的即刻粘结强度;老化处理后的粘结强度显著高于相应的水湿粘结组(SB组和PB组)(P<0.05);乙醇湿粘结试件的杂化层清晰完整、质地均一。结论:乙醇湿粘结技术可提高全酸蚀粘结剂的牙本质粘结强度和粘结耐久性,获得界限明确、质地均一的杂化层。
基金Project(50871065) supported by the National Natural Science Foundation of ChinaProjects(08DJ1400402,09JC1407200,10DZ2290904) supported by the Science and Technology Committee of Shanghai Municipality,China
文摘The first-principles method based on the projector augmented wave method within the generalized gradient approximation was employed to calculate the superlattice intrinsic stacking fault（SISF） and complex stacking fault（CSF） energies of the binary Ni3Al alloys with different Al contents and the ternary Ni3Al intermetallic alloys with addition of alloying elements,such as Pd,Pt,Ti,Mo,Ta,W and Re.The results show that the energies of SISF and CSF increase significantly with increase of Al contents in Ni3Al.Addition of Pd and Pt occupying the Ni sublattices does not change the SISF and CSF energies of Ni3Al markedly in comparison with the Ni-23.75Al alloy.While addition of alloying elements,such as Ti,Mo,Ta,W and Re,occupying the Al sublattices dramatically increases the SISF and CSF energies of Ni3Al.The results suggest that the energies of SISF and CSF are dependent both on the Al contents and on the site occupancy of the ternary alloying element in Ni3Al intermetallic alloys.
基金Project (2091003) supported by Beijing Natural Science Foundation, China
文摘CuI thin films with nano-scale grains of about 35nm were deposited via spraying method with using acetonitrile as solvent. The influence of iodine doping concentration in acetonitrile solution on the structure, topographic and optical properties of CuI thin films was investigated. X-ray diffraction results showed that CuI iodine-doped films doped CuI：I2 were in γ-phase of zinc blende structure with （111） preferential plane. Scanning electron microscopy revealed that the microstructure of CuI films depended on the relative amount of doping iodine in the solution. When the iodine doping amount in acetonitrile solution was 0.025 g, the film was uniform and compact, the optical transmittance was 75.4% in the part of visible region and the energy band gap was close to 2.96 eV.
文摘A model is proposed to evaluate the,effective modufi of a composite reinforced by two-layered spherical inclusions.This model is based on the localisation problem of a two- layered spherical inclusion embedded in an infinite matrix.The interations of the reinforced phases are taken into account by using the average matrix stress concept.When the external layer vanishes,the proposed model reduces to the classical Mori-Tanaka's model for spherical inclusions.Theoretical results for the composite of polyester matrix filled by hollow glass spheres and voids show excellent agreement with experimental results.
