The catenary irregularity is researched from time-frequency analysis of the data detected based on existing research results of track irregularity and track spectrum.

在已有轨道不平顺和轨道谱研究成果的基础上，从接触网不平顺检测数据的时频分析方面对接触网不平顺进行了研究。

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These, too, were based on existing real research.

这些也都是基于现有的真实研究。

youdao

The existing research relies instead on self-reported data, based on memory.

现有的研究仅仅是在记忆的基础之上而非自愿提供的数据。

youdao

The kit was prepared based on extensive research of existing teaching practices and needs in the field of heritage education and is targeting teachers and students of grades 5 and 6 and is complementary to the national curriculum.

UNESCO: OFFICE IN AMMAN

Based on a review of research from various sources going back decades, the papers suggest that while existing efforts to increase student achievement are an important part of education reform, they have not focused enough on what it takes to motivate students in school.

FORBES: Motivation Matters: 40% Of High School Students Chronically Disengaged From School

By now, however, enough research has been done by privately funded scholars that the surgeon general could write a report based on existing material.

CNN: Obama needs a 'Plan B' on guns