排序方式: 共有14条查询结果,搜索用时 0 毫秒
11.
Mu-zi Li Jin-rui Wang Hong Liu Xia Wang Kang Gan Xiu-ju Liu De-li Niu Xiao-qing Song 《Journal of Zhejiang University. Science. B》2016,17(9):703-711
Objective
This study explored the effects of different light curing modes and ethanol-wet bonding on dentin bonding strength and durability.Methods
A total of 54 molars were randomly divided into three groups: Single Bond 2, Gluma Comfort Bond, and N-Bond. Based on the three light-curing modes and presence or absence of ethanol pretreatment, the samples were assigned to six subgroups: high-light mode, ethanol pretreatment+high-light mode, soft-start mode, ethanol pretreatment+soft-start mode, standard mode, and ethanol pretreatment+standard mode. All samples were bonded with resin based on the experimental groups. After 24 h and 6 months of water storage, a universal testing machine was used to measure microtensile bond strength. Scanning electron microscopy (SEM) was applied to observe mixed layer morphology.Results
The 24-h and 6-month microtensile bond strengths of the ethanol pretreatment groups were significantly higher than those of the non-ethanol pretreatment groups at the same light modes (P<0.05). With or without ethanol pretreatment, the microtensile bond strengths of the high-light modes were significantly lower than those of the soft-start modes and standard modes (P<0.05). The microtensile bond strengths of samples from the 6-month water storage group significantly decreased compared with those of samples from the 24-h water storage group (P<0.05). The soft-start groups and standard groups formed better mixed layers than the high-light mode groups, whereas the ethanol pretreatment groups formed more uniform mixed layers than those without ethanol pretreatment.Conclusions
Ethanol-wet bonding technique, soft-start, and standard modes could improve dentin bonding properties.12.
本文对低压配电系统中重复接地及等电位联结进行了探讨。明确在TN系统中是对PE线重复接地,而不是对N线重复接地,并对等电位联结与重复接地的关系发表了看法。 相似文献
13.
本文从实用角度探讨了双以太网技术的必要性,并详细描述了如何在CISCO交换机环境、Windows操作系统、Linux操作系统及Solaris操作系统下建立双以太网,对建立一个高可靠性网络应用具有参考和借鉴意义。 相似文献
14.
《Journal of Informetrics》2020,14(2):101034
Despite general agreement on the importance of social capital in individual knowledge creation, little is known concerning the role of dyadic social capital in collaborative knowledge creation. This study proposes a classification of dyadic social capital using two-dimensional matrix and investigates their roles in enhancing collaborative knowledge creation. It is found that the dyads who have strong dyadic tie strength while taking advantage of their dyadic bridging social capitals both in the ego network and global network come up with more high-impact knowledge. This study also challenges the statement that an inverted U-shaped relationship between dyadic tie strength and knowledge creation found in previous literatures, and indicates dyadic structure hole serving as effective moderating effect makes the quadratic effect disappear and catalyzes the strength of strong tie. 相似文献