不同形状超声乳化针头在扭动超声模式的应用

目的:通过与Infinity超声乳化针头对比,观察Centurion双重弯曲形状设计的超声乳化针头的临床效果。方法:前瞻性对照研究,将年龄相关性白内障患者132例132眼,随机分为两组,试验组66例66眼采用Centurion超声乳化针头,对照组66例66眼采用Infinity超声乳化针头,两组均用Centurion超声乳化仪在同一手柄下,利用相同参数下完成常规的超声乳化联合人工晶状体植入术。记录两组术中的累积消耗能量(cumulative dissipated energy,CDE),观察术后1wk,1mo的最佳矫正视力(best corrected visual acuity,BCVA)、角膜内皮密度(corneal endothelial cell density,CD)、中央角膜厚度(central corneal thickness,CCT)。采用独立样本t检验和χ2检验进行统计分析。结果:两组患者的CDE差异有统计学意义(P<0.05)。术后1wk时BCVA(Log MAR)试验组优于对照组,差异有统计学意义(P<0.05)。术后1wk试验组CCT小于对照组,差异有统计学意义(P<0.01),但术后1mo两组无统计学差异(P>0.05)。结论:Centurion超声乳化针头能有效减少术中超声能量的释放,减少术后角膜内皮的损伤,对术后早期视力恢复更具有优势。

Peak Load Evaluation Based on the Accumulated Annual Energy

This paper presents a nonlinear approach to estimate the consumed energy in electric power distribution feeders. The proposed method uses the statistical solution algorithm to analyze the active energy monthly consumption, which enables one to estimate the energy consumption during any period of the year. The energy readings and the normalized accumulated energy profile are used to estimate the hourly consumed active power, which can be used for future planning and sizing the equipment of the electrical system. The effectiveness of the proposed method is demonstrated by comparing the simulated results with that of real measured data.