Comparison of testicular volume differential calculations in adolescents with varicoceles

PurposeWe aimed to develop a conversion formula between different calculations for testicular volume asymmetry.Materials and methodsMale adolescents with varicoceles who underwent scrotal ultrasound were studied. Two formulas were analyzed: (1) testicular volume differential, TVDiff = (RTV – LTV)/(TTV), and (2) atrophy index, AI = (RTV – LTV)/(RTV). RTV, LTV, and TTV represent the right, left, and total testicular volume. Through transformations and regression a conversion formula between the calculations was derived.ResultsBased on 248 ultrasounds, a clear relationship between the two formulas was demonstrated: AI = ln[(1.97 × TVDiff) + 1], (p < 0.0001).ConclusionsDifferential testicular volumes can easily be converted from one formula to another with near-perfect accuracy. The formulas are essentially identical and interchangeable.     

一种新的基于导频簇方案的时变OFDM系统双重ICI消除算法

主要研究了正交频分复用(OFDM)系统基于线性时变(LTV)模型的子载波间干扰(ICI)消除算法。在LTV模型中采用双重ICI消除算法可以达到比较好的性能,然而由于导频处的估计值准确度有限,限制了算法性能的进一步提升。提出了一种基于导频簇方案的双重ICI消除算法,采用基于导频簇的梳状导频结构,大幅降低导频处的ICI影响,取得了较好的效果。     

UV、IR光谱法鉴别泽泻与窄叶泽泻

本文应用UV、IR分析仪对泽泻及其混淆品窄叶泽泻进行了鉴别研究,UV光谱研究结果显示,泽泻的甲醇提取液在204.1±0.5 nm处有最大吸收峰,窄叶泽泻在205.7nm处有最大吸收,另外在285 nm附近有一弱吸收。红外研究结果显示,泽泻水提物红外光谱在3402、2933、1642、1054和926 cm-1波数处有吸收,而窄叶泽泻在指纹图谱区与正品泽泻存在较大差别。