The linear differential equations are set up and the solutions of the equations are founded in order to get two sound energy density formulas.
从能量守恒定律出发,假定舞台空间及观众厅空间均系完全扩散的声场,建立线性微分方程组并求解之,即得到分别求两个空间声能密度的公式,将两个公式适当变形,即得到分别求舞台空间及观众厅空间的声衰变方程,并用相关资料发表的实测数据对理论计算结果进行了印证,其误差范围在工程许可的范围内。
Quantitative acoustic densitometry can be used for quantitative evaluation of myocardial tissue abnormity.
应用声学密度定量分析技术可对心肌组织学异常进行量化评价,能客观反映高血压心肌纤维化程度,现就声学密度各参数改变与高血压心肌纤维化关系的研究进展作一介绍。
Purpose: To evaluate the clinical value of tissue doppler imaging (TDI),color kinesis(CK) and acoustic densitometry (AD) in the assessment of non-infarcted regional myocardial function.
目的 :采用组织多谱勒成像 (TDI)、彩色室壁运动分析 (CK)及声学密度测定 (AD)评价心梗患者非梗塞区心肌功能的改变。
Experimental Study on Sludge Disposal Using Ultrasonic Technology in Low Power Density
超声波在低声能密度下处理污泥的实验研究
acoustic impedance density
声阻抗密度，声阻抗率
Sonic-Density-Neutron logging suite
声波-密度-中子测井系列
density-sonic crossplot method
密度-声波交会图法
Acoustic Densitometry and Its Relationship with Renal Function in Chronic Renal Failure;
声学密度与慢性肾功能不全时肾功能关系的研究
Performance Analysis of Quasi-cyclic Low Density Parity Check Codes for Acoustic Communication System in Shallow Water
准循环低密度校验码在浅海水声通信系统中的性能
Density Functional Theory Study on Energy Band and Density of States of ZnO
ZnO能带及态密度的密度泛函理论研究
Water and ice having nearly the same density, sound travels at nearly the same speed through both. That is the chief reason for the failure of the experiment.
由于水和冰的密度几乎相同，声波通过二者的速度也几乎相同。这就是实验未能成功的主要原因。
Enclosure Gel filled, ultrasonically welded, high density ABS housing.
附胶体填充，超声焊接，高密度abs外壳。
The concept of" equivalent noisy power spectral density" is introduced in this paper.
文中提出等效噪声功率谱密度的概念。
Ultrasonic welding of integrated circuits is of highest accurate.
超声波焊接的集成电路，精密度极高。
This wave of excess density is sound.
这种过剩密度的波就是声波。
Analysis of Influencing Factors of Cement Evaluation Based on the CBL-VDL Logging Data.
固井声幅-变密度测井的影响因素分析
Quantitative Ultrasound Measurement for the Assessment of Bone Density Based on Leteral Wave;
基于侧波的定量超声骨密度测量方法
The Design of Ultrasound BMD Measurement System Based on FPGA
基于FPGA的超声骨密度测量系统的设计
The Research and Development of Ultrasonic Liquid Density Sensor
超声波液体密度测量仪的研究与开发
THE RELATIVASTIC TRANSFORMATION OF ENERGYFLOW DENSITY VECTOR AND ENERGY DENSITYOF ELECTROMAGNETIC FIELD
电磁场能流密度矢量与能量密度的相对论变换
The possibility density technology was used to entrap a little change of acoustical signal, which can discern the gas incursion and give the alarm efficaciously.
利用概率密度技术捕捉声信号的微小变化 ,能够有效地识别气侵并报警。