这些被称为重子声学振荡的东西为测量随时间变化的宇宙的膨胀速度和对暗能量的值施加限制提供另一尺码。
These so-called baryon acoustic oscillations offer another yardstick for measuring the expansion rate of the universe over time and putting limits on the value of dark energy.
声学测温是一种先进的温度测量方法，与传统方法相比，具有很多优势。
The acoustic thermometry has many advantages, compared with conventional methods of temperature measurements. It is an advanced technology.
声学时差法流量计适用范围广，性能好，是一种可以推广的河流流量自动测量仪器。
Acoustic transit time flowmeter of wide application and high performance it is a kind of automatic river discharge measurement instrument that can be widely promoted.
研究了一种测量流动谷物含水率的声学方法。
This paper studies an acoustic method for measuring moisture contents in grain flowing.
系统具有较强的适应性及实用性，在室内声学测量中具有广泛的应用前景。
This system will be widely applied to room acoustical measurement due to its adaptability and practicality.
回声测深仪是用来测量水深的一种声学测量设备，其以水中超声波的传播速度为确定条件，利用发射波与反射回波时间差来测量水深。
Echo Sounder is a kind of acoustic measuring depth equipment, which can measure depth with the time between transmitted wave and echo on condition in which the speed of ultrasonic is fixed.
声学。道路交通噪声的表征和测量。一般测量规范。
Acoustics - Characterization and measurement of road traffic noise - General measurement specifications.
在应用声学领域，声学材料与结构的吸声测量始终是一项重要的工作。
In applied acoustics field, the sound absorption measurement of an acoustic material and structure is always an important and basic task.
声学和振动。弹性件振动声学传输性能的实验室测量。第2部分：平移运动用弹性支架的动态劲度。直接法。
Acoustics and vibration - Laboratory measurement of vibro-acoustic transfer properties of resilient elements - Part 2: dynamic stiffness of elastic supports for translatory motion - Direct method.
混响室是声学专业的实验室用房，它在测量声波无规入射时材料的吸声系数和测量噪声源的声功率级中得到了广泛应用。
In the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively.
吸声与隔声是材料的声学特性，吸声与隔声测量对噪声控制与声学设计具有重要意义。
Sound absorption and insulation is the acoustical characteristic of material. Measurement of sound absorption and insulation has an important significance in noise control and acoustical design.
通过测量pdc的声学参数和弹性参数，对破坏机理进行了初步探讨。
The acoustic parameters and the elastic parameters of PDC were measured and the destructive mechanism was primarily discussed.
声学测温是一种先进的温度测量方法，与传统方法相比，具有很多优势。
The acoustic thermometry has many advantages, compared with conventional methods of temperature measurements.
声速是海洋声呐测量中最重要的声学参数之一。
The sound velocity is one of the most important acoustic parameter in ocean sonar.
激光扫描声学显微镜是一种新型的无损检测多层陶瓷电容器内部缺陷的测量技术。
The scanning laser acoustic microscope is a new type of nondestructive testing technique for detecting the internal defects of multilayer ceramic capacitors.
声学测温技术是近些年来兴起的一种新型测温技术，在国外已经被成功的应用于火电厂锅炉温度场的在线测量，并产生了可观的经济效益。
The technique of acoustic pyrometer in abroad has been used successfully to detect the temperature field of boiler in power plan, which brought about considerable economic benefits.
本文介绍了声学特性测量混响室法的基础室内声场理论与阻抗管法的基础管道平面波理论。
In this paper, room sound field theory as the basis of measurement based on reverberation chamber and waveguide theory as the basis of measurement based on impedance tube are introduced.
本文是应用声学原理中的近场理论，通过工程技术实践探讨测量低频扬声器频响的一种方法。
In this paper a method base on the near-field theory of acoustics is used to measure the frequency response of the low-frequency loudspeaker through the engineering and technology practice.
本文从声辐射和声散射两个角度分析了蛙人的声学特性，并利用比较法测量肺部和模拟呼吸器的目标强度。
The paper analyses the diver's acoustic characteristics from radiating and scattering, and measures the target strengths of lung cavities and simulated air tanks with the comparative method.
方法观察模块浓度的不同所致颜色与透明度的变化，并对PAA模块的声学特性包括密度、声速及声衰减进行测量。
Methods The color and transparency of different concentration phantoms were observed. Properties including density, acoustic speed and acoustic attenuation of PAA gel phantom were measured.
提出了一种实用的声学法测量复合材料弹性常数的方法。
A test method of velocity measurement for elastic constants of composite material is proposed.
声波水泥胶结测井实质上就是通过测量石油套管井的水泥胶结面的有关声学参数来判断水泥胶结质量。
Cement Bond Log virtually measures acoustic parameters related to cement-casing interface to determine the quality of cementation.
目前，评价仿组织超声体模的主要方法是通过测量制备体模的仿组织材料声学参数是否符合人体组织的声学参数范围。
At present, the way to evaluate the phantom is that acoustic parameters of tissue mimicking material are detected and judged to agree with acoustic parameters of body.
基于射线声学的虚源法，通过具体算例，分析了典型声源声聚焦引起的测量误差。
Here the measurement errors due to acoustic focusing of typical sound sources are analyzed by detailed examples based on the method of image sources in the Ray Theory.
目的评价超声声学定量（AQ ）技术测量左心房功能的准确性。
Objective To evaluate the accuracy of real time two dimensional echocardiographic acoustic quantification (AQ) for measurement of the left atrial (LA) function.
吸声材料的吸声特性及其在室内的位置布置是室内声学研究的一个非常重要的部分，目前多是在实验室中进行测量研究。
The absorption properties of sound-absorbing material and its location in the room is a very important part of room acoustics study. The study methods are measured in the laboratory.
测量声速是大学物理实验中一个比较重要的实验，通过对声速的测量可以了解被测介质的声学特性。
Measuring sound velocity is an important physical experiment. It is possible to know the acoustical characteristics of measured medium by measuring sound velocity.
在室内声学测量中，参数的测量结果受到测试技术和系统的影响。
In room acoustic measurement, the results of objective parameters can be influenced by the measurement techniques and instruments used.
在室内声学测量中，参数的测量结果受到测试技术和系统的影响。
In room acoustic measurement, the results of objective parameters can be influenced by the measurement techniques and instruments used.
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