排序方式: 共有24条查询结果,搜索用时 0 毫秒
11.
12.
14.
15.
16.
17.
18.
19.
本文从根动与声学角度出发,用一种高性能的检测系统采集了挠动脉脉搏声信号,首次利用倒谱分析技术对两种脉搏信号进行了处理.获得了脉象功率谱和倒谱及其特征参数.分析结果表明:脉象功率谱可准确地判断人的呼吸频率特性;清脉信号在SHZ以内的谱能量约占总能量的83.7呢,而结代脉仅占47.2%;由倒港客观、准确地获得了脉搏周期值,倒谱可定量地给出脉搏强度大小,并可分析心律的稳定性等.本文的研究,为中医脉象的客观化研究和西医的心血管疾病的无创检测提供了一条新的途径. 相似文献
20.
In the frequency range 2—9.3 MHz and temperature range 5—40℃,ultrasonic attenuationcoefficients of five normal tissues and three abnormal tissues excised from five people were measuredin vitro by means of pulse transmission technique.The dependences of ultrasonic attenuation uponfrequency and temperature were investigated and much attention was paid to ultrasonic attenuation ofabnormal tissues.Comparison between ultrasonic attenuation coefficients of normal and abnormaltissues show that the ultrasonic attenuation in abnormal tissue is higher than that in normal tissue.Conclusions on the experimental results were given. 相似文献