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1.
Comparison of high order aberration after conventional and customized ablation in myopic LASIK in different eyes of the same patient 总被引：4，自引：0，他引：4
Purpose: To verify whether there exists any difference in higher order aberrations after undergoing myopic LASIK (laser in situ keratomileusis) with conventional ablation and customized ablation in different eyes of the same patient. Methods: This was a prospective randomized study of 54 myopic eyes (27 patients) that underwent LASIK using the Nidek EC-5000 ex-cimer laser system (Nidek, Gamagori, Japan). Topography-guided customized aspheric treatment zone (CATz) was used in the first eye of the patient (study group) and the other eye of the same patient was operated on with conventional ablation (control group). Higher order aberrations [root-mean-square (RMS) in the 5-mm zone] of both groups were observed with the Nidek OPD-Scan aberrometer before and 3 months after LASIK. Preoperative mean refractive error was similar between two eyes of the same patient (t=?0.577, P>0.05). Results: Preoperatively, higher order aberrations (RMS in the 5-mm zone) in the CATz ablation and conventional groups were (0.3600±0.0341) μm and (0.2680±0.1421) μm, respectively. This difference was not statistically significant (t=1.292, P>0.05). Three months after LASIK, higher order aberrations (RMS in 5-mm zone) in the CATz ablation and conventional groups were (0.3627±0.1510) μm and (0.3991±0.1582) μm, respectively. No statistically significant difference was noted between pre- and postoperative higher order aberrations in the CATz group (t=?0.047, P>0.05). However, a statistically significant increase in higher order aberrations was observed after conventional ablation (t=?5.261, P<0.05). A statistically sig-nificant difference was noted in the increase of higher order aberrations after LASIK between groups (t=?2.050, P=0.045). Con-clusion: LASIK with conventional ablation and topography-guided CATz ablation resulted in the same BSCVA (best specta-cle-corrected visual acuity) 3 month after LASIK. Higher order aberrations were increased, but the increase of higher order ab-errations after customized ablation treatment was less than that after conventional ablation. 相似文献
2.
彭纳揆 《重庆第二师范学院学报》2006,19(1):91-94
我国教育系统是“强作用”下的非平衡系统,科学发展观对于教育系统的和谐发展有着重要的指导作用。这是因为,教育哲学基本问题与科学发展观的核心是一致的;实现教育公平对社会和谐发展具有推进作用;教育是可持续发展的立足点。应该科学地认识和对待教育系统发展中的现实非平衡问题,促进教育系统的和谐发展。 相似文献
3.
阐述了耗散结构的基本理论及其在体育科学中的应用。包括耗散结构与热力学的辩证关系、耗散理论与非平衡态生物膜、运动训练过程的自组织特征、从耗散结构看运动员竞技能力的发展等。 相似文献
4.
ＦＲＡＣＴＡＬＭＯＲＰＨＯＬＯＧＹＩＮＤＬＡＵＮＤＥＲＭＵＬＴＩＰＡＲＡＭＥＴＥＲＷａｎｇＪｕｎｓｈｅｎｇ（王俊生）；ＷｅｉＹｕ（韦钰）（ＮａｔｉｏｎａｌＬａｂｏｒａｔｏｒｙｏｆＭｏｌｅｃｕｌａｒａｎｄＢｉｏｍｏｌｅｃｕｌａｒＥｌｅｃｔｒｏｎｉｃｓ）... 相似文献
5.
高文浩 《河北体育学院学报》2018,32(5):21-26
运用文献资料和实证分析相结合的方法,对我国公共体育产品供给存在的问题进行诊断,并基于非均衡模型探析体育产品供需矛盾的肇因,提供相应的解决思路。研究表明：公共体育产品供给存在着供给体制不健全、供给主体不足、体育基础设施供给不足且不均衡、供给资金不均衡、体质监测和社会体育指导员供给不容乐观等问题,新制度经济学的产权理论、交易费用理论和制度变迁理论等可提供解决思路,旨在为公共体育产品供给提供理论支撑和实践指导,促进我国公共体育产品供需均衡发展。 相似文献
6.
A series of ablation experiments on silicon surface by femtosecond laser system of 775 nm and 150 fs duration pulses were carried out.The morphological characteristics and the associated effect in the ablation were tested by atomic force microscope (AFM),scanning electron microscope (SEM),focused ion beam (FIB),and the optic microscope.The single pulse threshold can be obtained directly.For the multiple pulses,the ablation threshold varies with the number of pulses applied to the surface due to the incubation effect.By analyzing the experimental data,the thresholds of laser fluences under various laser pulse numbers were obtained,and the relationships between ablation area and laser energy and laser pulse number were concluded.Meanwhile,the periodic ripple structure on silicon surface was found.Under the condition of certain laser power,the number of laser pulse can influence the formation of ripples. 相似文献
7.
孙国涛 《河北体育学院学报》2013,(1):66-71
运用文献资料、数理统计、对比分析等方法,以我国行政区划为单位,对第7—11届全运会田径比赛以及全国青少年田径锦标赛成绩进行横向对比,结合在世界田径锦标赛中我国三个年龄阶段运动员奖牌获得项目纵向比较研究。结果表明,区域性与非均衡是我国竞技田径相辅相成的特征表现并呈现动态变化的发展态势。认为,要完善体制,形成规范、高效的运行机制;因地制宜、资源共享;优化人力资本;提高科技含量,创新训练理论,以及推进“四化”步伐,从而促进我国竞技田径的健康发展。 相似文献
8.
陶文翠 《江西教育学院学报》2012,33(2):40-42
民间信仰通过特定的仪式、俗礼、象征,对人的心理、情感、人格、行为等方面产生规范作用,有助于确立稳定的社会道德伦理秩序。由于社会转型、文化变迁及＂科学＂、＂理性＂的现代精神引起了传统与新兴、主流与非主流的文化价值冲突,在这一过程中,居于地方性村落亚文化与意识形态深层结构的民间信仰遭遇到了现代性话语的巨大冲击,其积极的隐性教育功能也处在消蚀和溶解的状态。 相似文献
9.
以杨宪益所译《边城》为例,探讨文中模糊数量词的英译及其模糊美感磨蚀的问题。译者用"以精确译模糊","以模糊译模糊","省略模糊语"等方法欲使英译与原文达到尽可能的一致,但由于英汉语在模糊语言生成机制上的差异,造成了模糊语言美感难以避免的磨蚀。 相似文献
10.
根据内变量的概念与质量、动量、能量和熵衡算方程,利用Gibbs局部平衡原理,获得化学、扩散、热传导过程均存在时材料的熵流和熵产,把Ziegler所提出的能量耗散广义正交原理量从一般固体的粘塑性领域推广到存在化学、扩散、热传导和力学现象相互作用的多孔介质领域,统一了粘性理论和塑性理论,建立了包括化学、扩散方程、热传导和力学过程的单相多组分和多相多组分两类介质模型的一般本构理论。 相似文献