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reflected central
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  反射中心
     The reflectivity expression of the fiber Bragg grating is obtained from the coupled mode theory. And the reflective properties of the fiber Bragg grating are educed from this expression. The reflected central wavelength is λ_B=2·n_(eff)·Λ.
     阐述了由耦合模理论得到的光纤Bragg光栅的反射率的表达式 ,并且由此表达式导出了光纤Bragg光栅的反射特性 ,反射中心波长为λB=2 ·neff·Λ。
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  相似匹配句对
     Diplomacy Central
     透视欧洲中央银行新掌门人——特莱切特
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     benefit for central;
     以效益为中心 ;
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     In the entire complex process, the ways and principles of solvingthe dispute reflected the Tibetanpolicy of the central government.
     由于康藏纠纷的复杂性,国民政府在处理过程中的措施和原则,实际上是国民政府的治藏政策的综合反映。
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     The central processing is reflected by two memory systems: working memory and long-term memory.
     中央加工通过两个记忆系统反映出来:短时记忆和长时记忆。
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     Reflected Law of Relativity
     相对论中的反射定律
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Objective To compare the reliability of fixation , microscotornelry and multifocal electroretinogram ( mERG ) examination for evaluating macular function by analyzing the results of operation oi macular hole. Methods Twelve patients with age-related macular hole were chosen by this study. The macular hole ol these patients had been closed after vilrectomy in our hospital during 1999 and 2000. Scanning laser ophthalmoscope of Kodenstock was used to study fixation and scotometry. RETIscan3. 12 system was used...

Objective To compare the reliability of fixation , microscotornelry and multifocal electroretinogram ( mERG ) examination for evaluating macular function by analyzing the results of operation oi macular hole. Methods Twelve patients with age-related macular hole were chosen by this study. The macular hole ol these patients had been closed after vilrectomy in our hospital during 1999 and 2000. Scanning laser ophthalmoscope of Kodenstock was used to study fixation and scotometry. RETIscan3. 12 system was used to carry out mERG examination. First-order kernel was selected. Results Six eyes had better distant vision. Four eyes stabilized while 2 eyes became worse. Nine eyes had improved near vision. Two eyes were the same while one eye dropped. All eyes but 2 had non-fovea fixation before operation. Seven cases got improved fixation while three cases remained the same. The light sensitivity of these eyes got much better, P < 0. 05. Four eyes had a volcano-shape ER(/ topography pre-operatively arid regained spiky peak post-operatively. The other eight eyes had no improvement. The results of mERG from first and second ring before and after operation had no significant difference, P > 0. 05. Conclusions Both the distant and near vision of eyes with macular hole had been improved alter operation. Near vision can reflect central visual acuity belter. Fixation and niicroscolomelry are sensitive to the functional change ol macular. mERG had no significant change alter the operation. Its use in testing macular function is limited by variability ,fixation and other factors.

目的 用激光扫描眼底镜检测黄斑裂孔手术前后固视、微视野和多焦视网膜电图(mERG),比较这几种方法评价黄斑功能的可靠性。方法 实验采集了因老年特发黄斑裂孔,行玻璃体切割术治疗后,黄斑裂孔闭合的12例患者,手术前后的固视、微视野、mERG的检测资料。用Rodenstock的激光扫描眼底镜(SLO)进行周视和微视野的检测。用Rodenstock的RETlsean3.12系统进行mERG测定24°视野范围的一阶反应(first-order kernel)。结果12例黄斑裂孔患考术后远视力提高6例,不变4例,下变2例;近视力提高9例,不变2例,下降1例。术前为非小心凹注视10例。术后注视改善7例,无改善3例;术前即为中心凹注视2例。术后光敏度较术前有明显提高,P<0.05。mERG:黄斑裂孔术前三维视觉山表现为火山口形状,术后黄斑裂孔闭合可观察到观觉山恢复的患者4例,术后观觉山形状无明显改善8例。mERG的中心 1、2环的值手术前后无明显改变,P>0.05。结论 手术后的远近视力较术的均有所提高;固视和微视野对于检测黄斑功能的改变比较敏感,其中微视野改善在明显.mERG无明显改变,在检测黄斑功能方面受到变异性、固视等...

目的 用激光扫描眼底镜检测黄斑裂孔手术前后固视、微视野和多焦视网膜电图(mERG),比较这几种方法评价黄斑功能的可靠性。方法 实验采集了因老年特发黄斑裂孔,行玻璃体切割术治疗后,黄斑裂孔闭合的12例患者,手术前后的固视、微视野、mERG的检测资料。用Rodenstock的激光扫描眼底镜(SLO)进行周视和微视野的检测。用Rodenstock的RETlsean3.12系统进行mERG测定24°视野范围的一阶反应(first-order kernel)。结果12例黄斑裂孔患考术后远视力提高6例,不变4例,下变2例;近视力提高9例,不变2例,下降1例。术前为非小心凹注视10例。术后注视改善7例,无改善3例;术前即为中心凹注视2例。术后光敏度较术前有明显提高,P<0.05。mERG:黄斑裂孔术前三维视觉山表现为火山口形状,术后黄斑裂孔闭合可观察到观觉山恢复的患者4例,术后观觉山形状无明显改善8例。mERG的中心 1、2环的值手术前后无明显改变,P>0.05。结论 手术后的远近视力较术的均有所提高;固视和微视野对于检测黄斑功能的改变比较敏感,其中微视野改善在明显.mERG无明显改变,在检测黄斑功能方面受到变异性、固视等诸多因素影响。

The reflectivity expression of the fiber Bragg grating is obtained from the coupled mode theory. And the reflective properties of the fiber Bragg grating are educed from this expression.The reflected central wavelength is λ_B=2·n_(eff)·Λ.Furthermore the relationship among the reflected wavelength λ,the grating spacing Λ,the maximum value of refractive index micro-disturber Δn_(max),the grating length L and reflectivity R_g is analyzed in theory.

阐述了由耦合模理论得到的光纤Bragg光栅的反射率的表达式 ,并且由此表达式导出了光纤Bragg光栅的反射特性 ,反射中心波长为λB=2 ·neff·Λ。进而理论分析了反射波长λ、光栅栅距Λ ,折射率微扰的最大值Δnmax、光栅区长度L和反射率Rg 之间的关系。

AIM:To explore the practicable value of somatosensory evoked potential(SEP) an d motor evoked potentials(MEP) in the evaluation of sensory and motor function r ecovery in the cerebral infarction(CI) patients. METHODS:According to limb muscular strength,138 patients with first CI were as signed into ≤3 grade group and > 3 grade group.SEP and MEP of the healthy side and paralytic side of CI patients were measured to calculate abnormal rate. RESULTS:The abnormal degrees of SEP and MEP were associated with the...

AIM:To explore the practicable value of somatosensory evoked potential(SEP) an d motor evoked potentials(MEP) in the evaluation of sensory and motor function r ecovery in the cerebral infarction(CI) patients. METHODS:According to limb muscular strength,138 patients with first CI were as signed into ≤3 grade group and > 3 grade group.SEP and MEP of the healthy side and paralytic side of CI patients were measured to calculate abnormal rate. RESULTS:The abnormal degrees of SEP and MEP were associated with the severity of disease(χ2=19.551,79.934,P< 0.001),and MEP was more sensitive.SEP and MEP we re in correlation with curative effect. In the control group,SEP was absent in 1 2 patients,prolonged in 14,and CI unhealed in 7,while MEP was absent in 20,prolo nged in 12 and CI healed in 1.MEP and SEP tests showed that significant differen ces were found among the three groups in the curative effects(χ2=8.433,P< 0.05; χ2=14.328,P< 0.01). CONCLUSION:SEP and MEP can objectively reflect central sensory passage impairm ent of CI patients, and it can also help forecast the prognosis.

目的:探讨体感诱发电位(somatosensoryevokedpotentials,SEP)及运动诱发电位(motorevokedpotentials,MEP)对脑梗死患者感觉和运动功能恢复的评估价值。方法:将138例首次发病脑梗死患者按肢体肌力≤3级和>3级进行研究,检查健、患侧的SEP,MEP,统计两组异常率。结果:SEP,MEP异常程度与病情严重程度有关,且MEP更为灵敏(SEPχ2=19.551,MEPχ2=79.934,P<0.001)。SEP,MEP与治疗效果有关联,SEP缺失、延长、正常组未愈分别为12,14,7例;MEP缺失、延长、正常组治愈分别为20,12,1例。MEP,SEP检查3组间治疗效果比较,差异有显著性意义(χ2=8.433,P<0.05;χ2=14.328,P<0.01)。结论:SEP,MEP客观反映脑梗死患者中枢感觉运动传导通路功能受损情况,并帮助预测其预后。

 
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