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This paper reports the Duplex Doppler blood flow spectrum of both renal arteries and abdominal aorta in 14 cases suffered from polycystic kidney (PCK) and 16 normal individuals to find the renal function status in relation to the peak flow velocity(PFV), pulsatility index(Pl) and blood flow volume (Q). The results showed that the control, PCK with creatinine<2mg% and>g%, PFV and Q had a statisticaly significant difference (P<0.001). It realized that their PFV and Q already had been involved before renal dysfunction... This paper reports the Duplex Doppler blood flow spectrum of both renal arteries and abdominal aorta in 14 cases suffered from polycystic kidney (PCK) and 16 normal individuals to find the renal function status in relation to the peak flow velocity(PFV), pulsatility index(Pl) and blood flow volume (Q). The results showed that the control, PCK with creatinine<2mg% and>g%, PFV and Q had a statisticaly significant difference (P<0.001). It realized that their PFV and Q already had been involved before renal dysfunction appeared clinically, while creatinine>6mg%. PI might become abnormal. PFV and Q of abdominal aorta of all the polycystic kidney patients except two showed marked decreased as compared with the normal control (P<0.005). Such suggested that decreased PFV and elevation of blood pressure both resulted from the systemic reaction in early stage. Mechanism of Doppler blood flow ultrasonic spectrum of the polycystic kidney was discussed. 本文报告用脉冲超声多普勒检测了16例正常人和11例多囊肾病人的双侧肾动脉和腹主动脉的血流频谱,分析了肾动脉的峰值血流速度(PFV)、阻力指数(PI)及血流量(Q)与肾功能的关系。发现正常人,多囊肾病人的血清肌酐浓度(Cr)<2mg％者和>6mg％者之间的PFV及Q有非常显著的差异(P<0.001),而PI仅当Cr>6mg％时才发生异常。说明多囊肾病人在肾功能受累之前肾动脉的PFV和Q已有异常改变;仅当肾功能受损时才出现PI的变化。 多囊肾病人腹主动脉的PFV,在肾功能受损之前较正常人明显下降(P<0.005)。这些病人除2例外,均有血压升高,说明他们的腹主动脉的PFV下降和血压升高一样都是全身性反应.本文还讨论了多囊肾血流多普勒频谱变化的机制。 A high speed digital data acquisition and wide band measurement system was used to acquire and record the ultrasonic pulse waveforms backscattered from normal and several pathological pig's fresh liver tissues (including ballooning degeneration, fatty degeneration, cirrhosis) in vitro. Some frequency domain analyses in the frequency domain ranging from 3MHz to 7MHz were performed in which the integrated backscatter coefficient (IBSC), the frequency dependence of backscatter coefficient (FDBSC), and the mean... A high speed digital data acquisition and wide band measurement system was used to acquire and record the ultrasonic pulse waveforms backscattered from normal and several pathological pig's fresh liver tissues (including ballooning degeneration, fatty degeneration, cirrhosis) in vitro. Some frequency domain analyses in the frequency domain ranging from 3MHz to 7MHz were performed in which the integrated backscatter coefficient (IBSC), the frequency dependence of backscatter coefficient (FDBSC), and the mean spacing (MS) among adjacent scatterers of the tissues were determined. The results obtained show that the differences among the normal and various pathological tissues cause distinct changes of the measured parameters. All the results studied indicate that the ultrasonic spectrum technique, which can be used in tissue characterization for pathological liver in clinics, has an encouraging prospect. 本文采用宽带超声脉冲测量系统，通过对散射回波高速数字采样，对猪的新鲜离体正常肝组织及若干病变肝组织（如水泡变性肝，脂肪变性肝及硬化肝）进行了分析研究。通过在３ＭＨｚ—７ＭＨｚ的频域分析，获得了各组织样品的积分背向散射系数（ＩＢＳＣ）、背向散射系数的频率依赖关系（ＦＤＢＳＣ）及组织内相邻散射元的平均间距（ＭＳ）等参数。所获结果显示，组织的病变导致了上述参数的明显变化。这表明，超声谱分析技术，对于肝病变组织超声定征及临床定量诊断，具有令人鼓舞的发展前景。 This papaer describes rock ultrasonic spectrum measurement technology. That is to adopt narrowpuise emissiom,broadband receivation and microcomputer analysis system;to take sound wave propagation characteristics and size effects into accownt of the samples during experiment;to discretize andquantize sound signs for data precessing;to take effective waves of rock characteristics by digital technology for fourier transform to obtain rock frequency spectrum,and to employ ultrasonic spectrum technologyfor... This papaer describes rock ultrasonic spectrum measurement technology. That is to adopt narrowpuise emissiom,broadband receivation and microcomputer analysis system;to take sound wave propagation characteristics and size effects into accownt of the samples during experiment;to discretize andquantize sound signs for data precessing;to take effective waves of rock characteristics by digital technology for fourier transform to obtain rock frequency spectrum,and to employ ultrasonic spectrum technologyfor research into rock properties-characterestics values of rock can reflect rock structure,mineral content,cementing and weathering extent etc and are relative to rock mechanics parameters,while spectrum shapecan reflect integral extent of rock. 本文简要叙述岩石超声谱测试技术，及应用该技术研究岩石特性的初步成果。本技术为：（１）采用窄脉冲发射、宽带接收声谱测试及微机分析系统。（２）测试时考虑岩石试件中声波特性及试件尺寸效应，（３）将声信号离散量化进行数据处理。（４）用数字门技术取反映岩石特性的有效波进行傅里叶变换获取岩石频谱。
ultrasonic spectrum
超声谱
Ultrasonic spectrum analysis with digital signal processing on composite materials 采用数字信号处理的复合材料超声谱分析 短句来源 All the results studied indicate that the ultrasonic spectrum technique, which can be used in tissue characterization for pathological liver in clinics, has an encouraging prospect. 这表明，超声谱分析技术，对于肝病变组织超声定征及临床定量诊断，具有令人鼓舞的发展前景。 短句来源 This papaer describes rock ultrasonic spectrum measurement technology. 本文简要叙述岩石超声谱测试技术，及应用该技术研究岩石特性的初步成果。 短句来源 超声频谱
The velocity-time integral(VTI) of mitral inflow was measured with Doppler ultrasonic spectrum. 应用多普勒超声频谱测量二尖瓣血流的流速时间积分 (VTI)。 短句来源 Stru cture and Recognition of Ultrasonic Spectrum Based on Workpiece-structure Parameter 基于工件结构参数的超声频谱特征的构造及识别 短句来源 Chapter 3 provides primary principles and approaches of ultrasonic spectrum analysis in accordance with features of ultrasonic testing signals. 第三章针对超声波检测信号特点，给出超声频谱分析的基本原理与方法。 短句来源 Chapter 4 introduces the research of application and techniques of ultrasonic spectrum features on the analytic system which has been constructed. 第四章介绍了在自行构建的超声频谱分析系统上，进行超声频域特征应用方法与技术的研究。 短句来源 Flaw classification is realized successfully through the ultraso nic spectrum analysis. The research proves that ultrasonic spectrum technology w ill promote the reliability of testing results. 利用超声频谱分析法成功地实现了缺陷的分类 ,试验结果表明 ,超声频谱分析技术可提高检测结果的可靠性 短句来源 更多 超声波谱
THE MEASURING TECHNOLOGY ON ROCK ULTRASONIC SPECTRUM 岩石超声波谱测试技术 短句来源 The rock ultrasonic spectrum analysis is an important method for the rock dynamic experiment, it has wide applied prospect. 岩石超声波谱测试技术是目前岩石力学实验研究的一种重要方法 ,具有广阔的应用前景 . 短句来源 “ultrasonic spectrum”译为未确定词的双语例句
Chapter 2 is to establish theoretical model of ultrasonic spectrum analysis system and to adopt in accordance with subject demands the reasonably designed practical system of ultrasonic spectrum analysis on the basis of regular ultrasonic testing system formation analysis. 第二章在分析常规超声检测系统组成的基础上，建立超声波频谱分析系统理论模型，结合课题要求选择设计合理的超声波频谱分析实现系统。 短句来源 The Variation of Internal Structure and Ultrasonic Spectrum in the Hardening Processes of Cement 水泥浆凝结硬化时内部结构与超声频谱的变化 短句来源 The Study on Measuring Umbilical Artery Blood Flow in Fetus with Ultrasonic Spectrum Analysis 超声多普勒脐动脉血流测定对胎儿监护的研究 短句来源 Mechanism of Doppler blood flow ultrasonic spectrum of the polycystic kidney was discussed. 本文还讨论了多囊肾血流多普勒频谱变化的机制。 短句来源 The characteristic of linear and nonlinear responses between arc excited ultrasonic emission and excited frequency was realized by the received signal from the acoustic to the ultrasonic spectrum. 对受激电弧的声发射信号分析表明，从音频到超声频带，电弧声发射与激励频率之间存在着线性响应和非线性响应特征。 短句来源 更多 
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A digitized ultrasonic spectrum analysis system is used to measure the frequency components of broadband waves diffracted from elliptical cracks with aspect ratios (ratio of major to minor axes) ranging from 1 to 8.
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