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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.
Effect of a distal protection device on epicardial blood flow and myocardial perfusion in primary percutaneous coronary intervention 总被引：2，自引：0，他引：2
Objective: The beneficial effect of percutaneous coronary intervention (PCI) in patients with acute myocardial infarction (AMI) has been well established, but there is the problem of no-reflow phenomenon which is an adverse prognostic factor in primary PCI. In the present study the effect of a distal protection device (PercuSurge GuardWire; GW) on epicardial blood flow and myocardial perfusion was evaluated. Methods and Results: Patients with AMI were randomly divided into 2 groups, the GW and the control groups. The GW group included 52 patients with AMI who underwent primary PCI with GW protection and the control group included 60 patients who underwent primary PCI without GW protection. Epicardial blood flow in the infarct-related artery (IRA) and myocardial perfusion were evaluated according to the thrombolysis in myocardial infarction (TIMI) flow grade and the myocardial blush grade (MBG). We found TIMI score of 3 was obtained significantly more frequently in the GW group (96%) than in the control group (80%). The MBG score of 3 was obtained also significantly greater in the GW group (65%) than in the control group (33%). Conclusion: Primary PCI with GW protection can significantly improve epicardial blood flow and myocardial perfusion. 相似文献
3.
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
4.
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
5.
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
6.
针对智慧古籍图书馆环境监测系统多停留在理论研究阶段,缺乏将新技术应用到实践的问题,设计一种基于物联网结构的多点无线传输环境监测系统。选用能联接多种传感器的电子原型开发系统Arduino作为测量节点,具有嵌入式芯片设计的片式计算机Raspberry PI作为网关兼轻量级Web服务器,结合具有跳频功能的nRF24L01无线射频模块,组成星型网络拓扑的无线监测系统。同时网关并行连接到OneNet物联网平台,用户可在任意地点查看智慧古籍图书馆环境情况。实验测试表明,该系统性能优良、扩展性强、用户体验好,价格低廉、部署方便,具有较高的应用价值。 相似文献
7.
Xin DU Jun-ping KANG Jia-hui WU Qiang LV Chao-shu TANG Chang-sheng MA 《Journal of Zhejiang University. Science. B》2010,11(8):548-552
Objective:Percutaneous coronary intervention(PCI) triggers an acute inflammatory response,while sirolimus is known to have anti-inflammatory properties;the inflammatory system response to PCI after sirolimus-eluting stent placement remains unclear.The purpose of this study is to determine the changes in high sensitive C-reactive protein(hs-CRP) and apelin after PCI procedure and drug-eluting stent implantation in patients with and without reduced left ventricular systolic function.Methods:Forty-eight consecutive patients undergoing PCI at the Beijing Anzhen Hospital between July and September 2006 were recruited.Sirolimus-eluting stents were employed in all patients.Blood samples were drawn immediately before and 24 h after the procedure.Plasma hs-CRP and apelin levels were determined by enzyme immunoassay.Results:Paired t-test revealed a significant increase in both hs-CRP and apelin post-procedure(P=0.006 and P0.0001,respectively).Patients with reduced left ventricular ejection fraction(LVEF) had significantly lower baseline apelin levels compared to those with normal ventricular function [(46.8±10.8) vs.(72.0±8.4) pg/ml,P0.001].However,apelin increased to a level similar to the level of those with normal left ventricular systolic function 24 h after the PCI procedure [(86.7±11.6) vs.(85.1±6.1) pg/ml,P=0.72].Conclusions:hs-CRP and apelin levels increased after PCI and sirolimus-eluting stent implantation.Patients with impaired left ventricular systolic function had significantly lower baseline apelin levels,which increased significantly after PCI. 相似文献
8.
利用激光溅射-超声分子束技术在反射式飞行时间质谱仪上研究了气相条件下Ni等离子体和甲醇、乙醇分子团簇的反应。实验中,直接用激光溅射Ni靶时观察到Ni的五种同位素离子（58Ni+、60Ni+、61Ni+、62Ni+、64Ni+）,在Ni等离子体和甲醇分子团簇的反应中观察到Ni+(CH3OH)n、NiO+(CH3OH)n、NiCH2+(CH3OH)n、H+(H2O)(CH3OH)n、四种团簇正离子,在Ni和乙醇分子团簇的反应中观察到Ni+(C2H5OH)n、NiCH2+(C2H5OH)n、NiC2H4+(C2H5OH)n、H+(H2O)(C2H5OH)n四种团簇正离子。重点研究了Ni和甲醇团簇反应的产物离子在不同的激光延时、激光能量、载气压力条件下对团簇产物种类和尺寸的影响及团簇产物的变化规律,并对团簇产物离子的形成机理进行了解释。 相似文献
9.
Chong Lai Ren-an Jin Xiao Liang Xiu-jun Cai 《Journal of Zhejiang University. Science. B》2016,17(3):236-246
Objective
Three mainstream techniques—laparoscopic hepatectomy (LH), percutaneous radiofrequency ablation (pRFA), and open hepatectomy (OH)—were compared in this study, in terms of their efficacies in the treatment of small hepatocellular carcinoma (HCC).Methods
A comparative study was performed within a total of 94 patients diagnosed with small HCC in our hospital from 2005 to 2010, who underwent LH (28), RFA (33), or OH (33). They had either a single tumor lesion of less than 5 cm or up to three nodules with diameters of less than 3 cm each. Outcomes were carefully evaluated throughout a 3-year follow-up interval and statistically interpreted.Results
The pRFA group had a significantly lower disease-free survival rate compared with the two surgical groups (P=0.001) and significantly shorter overall survival (P=0.005), while the LH group and the OH group had no difference in survival results. For patients younger than 60 years old, surgical approaches offered a better long-term overall survival prognosis (P=0.008). There were no statistically significant differences among the three groups in overall survival for elderly patients (P=0.104).Conclusions
Among patients with small HCC, LH may provide better curative effects than pRFA without increasing complication rates. pRFA leads to faster recurrence than surgical resections. LH has similar therapeutic effects to OH and causes less trauma. For patients younger than 60 years old, LH may be the best curative treatment. Elderly patients may choose either surgery or pRFA.10.
为探讨经尿道气化术治疗浅表性膀胱肿瘤的临床效果，对1998年10月－2000年11月间26例浅表性膀胱肿瘤患者采用经尿道气化术进行治疗。26例均顺利完成手术操作，手术平均时间40min，术中均未输血，未发生膀胱穿孔及大出血。术后随访2－18个月,3例复发。结果表明，经尿道膀胱肿瘤气化术（TVBT）具有快速、出血少、手术并发症少等优点，疗效满意。 相似文献