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find Author "张海霞" 2 results
  • 疗养院实现隐性知识共享因素分析与解决途径

    目的分析疗养院工作人员实现隐性知识共享的影响因素。 方法统计北戴河疗养院图书馆2012年4月-11月和2013年4月-11月维普中文生物医学期刊和自建资源服务系统文献检索次数,绘制折线图对比,按照2010年-2013年图书馆每年登记的总阅览人数绘制分布图对比。 结果维普中文生物医学期刊和自建资源服务系统文献检索次数在2012年4月-11月和2013年4月-11月均呈递增趋势,且两个数据库使用率相差大;2010年-2013年图书馆每年登记的总阅览人数逐年上升。 结论在提高疗养院人员的文献检索能力、增强检索必要技巧的同时,仍要加强信息素养的培养。

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  • Characterization of rabbit corneal biomechanical properties after corneal refractive surgery based on rapid loading-unloading uniaxial tensile test

    In order to understand how the biomechanical properties of rabbit cornea change over time after corneal ablation, 21 healthy adult rabbits were used in this study, with the left eye as experimental side and the right eye as the control side. Firstly, a lamellar knife was used to remove a portion of the anterior corneal surface tissue (30%~50% of the original corneal thickness) from the left eye of each rabbit, as an animal model simulating corneal refractive surgery. Secondly, postoperative experimental rabbits were kept for one, three, or six months until being euthanized. Strip specimens were produced using their corneas in vitro to perform a uniaxial tensile test with an average loading-unloading rate of approximately 0.16 mm/s. Finally, the visco-hyperelastic material constitutive model was used to fit the data. The results showed that there was a significant difference in the viscoelastic parameters of the corneas between the experimental and the control eyes at the first and third postoperative months. There was a difference in tangential modulus between the experimental and the control eyes at strain levels of 0.02 and 0.05 at the third postoperative month. There was no significant difference in biomechanical parameters between the experimental and the control eyes at the sixth postoperative month. These results indicate that compared with the control eyes, the biomechanical properties of the experimental eyes vary over postoperative time. At the third postoperative month, the ratio of corneal tangential modulus between the experimental and the control eyes significantly increased, and then decreased. This work lays a preliminary foundation for understanding the biomechanical properties of the cornea after corneal refractive surgery based on rapid testing data obtained clinically.

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