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Compared with the traditional 2000 and 7000 series a-luminum alloys, 1420 Al-Li alloy decreases density by 12% and increases Young's modulus by 8%, and has excellent corrosion resistance and high temperature properties.

1420铝锂合金与传统的2000、7000系列铝合金相比，密度低12%，弹性模量高8%左右，具有优异的抗腐蚀性和高温性能。

The second method is described through researching the Lipchitz index α and Gauss smooth factor σ to find the local maxima of a wavelet transform modulus.

二是用信号小波变换的奇异值检测法，对有效信号和噪声的李氏指数和模极大值进行了研究。

B Under linear condition, the dynamic behavior of viscoelastic materials, i. e. their complex modulus, Can be identified simultaneously at diffirent frequencies by the method.

对比以往研究者提出的方法，新方法有两大优点：第一，新方法可辨识粘弹材料非线性动态特性；第二，在线性情况下，用新方法可一次得到多频率点处的复模量值。

Objective:To explore the feasibility of laparoscopy in diagnosing and treating of abdominal diseases.

目的：探讨腹腔镜用以诊断腹部外科疾病及选择治疗方案的可行性。

The lifetime of nylon 1010 and nylon 1010/POSS composites decreased with increasing temperature.

热重-红外联用分析表明尼龙1010在氮气气氛下的降解产物主要为小分子的低聚物，POSS并不改变尼龙1010降解产物的组成。