It possesses of short content , graceful rhythm , tempo trenchancy , easily to learn , abroad notes , etc 流行音乐具有内容短旋律优美节奏鲜明通俗易懂音乐广泛等特点。
2.
Analyzing real hrv , proving the every segment power ( high frequency > low frequency ) of projection in frequency axis is times with the every segment power by using fft , the lf / hf by using 2 method is primarily sameness . 3d figure is a trenchancy tool for doctor to look over the relation between time and frequency 对实际的心率变异信号进行了维重庆大学硕士学位论文格纳分析，证实通过计算三维时频分布对频率轴的投影得到的各频段（高频段、低频段等）功率，与直接用fft所得各频段功率，二者只相差一个比例系数，并且二者lf hf的值基本相同。
3.
Developing foundation facilities of xi ' an and managing environment had been regarded as the direction of the urban spatial structure optimization . accoroding to the analysis of developing background of xi ' an , the optimization thinking had been pointed out . the urban competitiveness should have perfect urban foundation facilities , daintily urban environment and trenchancy urban visualize , which can accelerate industry to centralize and increase the urban competitiveness 通过对西安市近年来制定的城市经济发展重点、城市空间发展战略及城市规划新理念等城市发展背景的分析，结合西安城市空间结构调整和优化的方向，提出西安城市空间结构优化的思路为：西安城市空间结构应具有基础设施配套完善、生态环境舒适怡人和城市形象个性鲜明的城市空间优势，促进产业集群，实现空间结构社会竞争力和环境竞争力大幅度改善，提高城市经济效益，增强西安城市竞争力。
