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The Application of the acoustic method to the Exploration of Urban Active Faults and a Comparison with the Artificial Earthquake, and Radar methods

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Earthquake Research in China 2004年第1期18卷 27-35页

作者： ZhaoGenmo WangDahong RenFeng ChenYukun EarthquakeAdministrationofTianjinMunicipality Tianjin300201China

The depth of upper fault point is the key data for ascertaining the active age of a buried fault on a plain. The difference of depth obtained from same fault may be dozens to several hundred meters when using different geophysical methods. It can result in the absolutely opposite conclusions when judging fault activity. Because of a lack of an artificial earthquake source with wide band and high central frequency, many kinds of methods have to be used together. The higher the frequency of the artificial earthquake wave, electromagnetic wave and sonic wave, the higher the resolution. However the attenuation is also very fast and the exploration depth is very shallow. The reverse is also true. The frequency of artificial seismic waves is in the tens of Hz. Its exploration depth is big and the resolution is poor. The frequency of radar electromagnetic waves is about a million Hz, indicating that the resolving power is better, but the exploration depth is very shallow. However, the acoustic frequency is thousands of Hz, its resolving power is better than that of the artificial earthquake method and the exploration depth is larger than that of the radar method. So it is suitable for extra shallow exploration in the thick deposit strata of the Quaternary. The preliminary results detected using the high frequency acoustic method in extra shallow layers indicates that previous inferences about some fault activity in the eastern part of the North China plain may need to be greatly corrected.

关键词： acoustic method Active fault

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Leak Detection of Gas Pipelines Based on Characteristics of acoustic Leakage and Interfering Signals

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Sound & Vibration 2019年第4期53卷 111-128页

作者： Lingya Meng Cuiwei Liu Liping Fang Yuxing Li Juntao Fu College of Information and Control Engineering China University of PetroleumQingdaoChina. Provincial Key Laboratory of Oil and Gas Storage and Transportation Safety University of PetroleumQingdaoChina. China SINOPEC Natural Gas Corporation BeijingChina.

When acoustic method is used in leak detection for natural gas pipelines,the external interferences including operation of compressor and valve,pipeline knocking,etc.,should be distinguished with acoustic leakage signals to improve the accuracy and reduce false *** this paper,the technologies of extracting characteristics of acoustic signals were *** acoustic leakage signals and interfering signals were measured by experiments and the characteristics of time-domain,frequency-domain and time-frequency domain were *** main characteristics of time-domain are mean value,root mean square value,kurtosis,skewness and correlation function,*** features in frequency domain were obtained by frequency spectrum analysis and power spectrum density,while time-frequency analysis was accomplished by short time Fourier *** results show that the external interferences can be removed effectively by the characteristics of time domain,frequency domain and time-frequency *** can be drawn that the acoustic leak detection method can be applied to natural gas pipelines and the characteristics can help reduce false alarms and missing alarms.

关键词： Leak detection acoustic method signal processing external interference characteristic extraction

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Applications of physical methods in estimation of soil biota and soil organic matter

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Soil Ecology Letters 2020年第3期2卷 165-175页

作者： Chagovetc Sergei Shenglei Fu Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions Ministry of EducationCollege of Environment and PlanningHenan UniversityKaifeng 475004China Henan Key Laboratory of Integrated Air Pollution Control and Ecological Security Henan UniversityKaifeng 475004China

Soil biota is the living component of soil organic matter(SOM),and plays a key role in the decomposition of *** soil biota and SOM are indicators of soil fertility and soil ***,they both are sensitive to soil *** researchers developed various technologies to detect soil biota and SOM,they are mostly destructive and cause disturbance to soil,which may not reflect the actual situation of soil biota and ***,here we mostly focused on the non-destructive physical methods for estimating soil biota and SOM and discussed their advantages and *** methods include but not limited to acoustic detection,radio frequency identification,radioactive tagging,hyperspectral sensing and electron energy loss *** addition,we pointed out the current research problems and the potential research directions for applications of physical methods in estimation of soil biota and SOM.

关键词： Soil organic matter Soil biota Advanced method acoustic method Spectroscopy Tagging

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基于声学方法的功能材料表面阻力特性测量

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声学技术 2003年第Z2期22卷 122-124页

作者：刘宏伟赵洪宫在晓中国科学院声学研究所声场声信息国家重点实验室北京100080

　　1、背景简介　　航行于大海中的各类舰船,都要为克服水的阻力作用而耗费大量不可再生的能源.人们一直期望着能找到一种材料,将它图刷于船舶与水接触的表面,就能够降低阻力、节约能源.对于声学而言,减阻是与降噪紧密联系在一起的,因... 详细信息

　　1、背景简介　　航行于大海中的各类舰船,都要为克服水的阻力作用而耗费大量不可再生的能源.人们一直期望着能找到一种材料,将它图刷于船舶与水接触的表面,就能够降低阻力、节约能源.对于声学而言,减阻是与降噪紧密联系在一起的,因此减阻也有特别的意义[1].由于阻力降低往往对应着流噪声的降低,声学工作者也希望能有一种表面材料,用于降低声纳导流罩和拖曳声纳的流噪声;如果能用于鱼雷,则有"一箭双雕"的作用.随着材料科学日新月异的发展,各种新材料层出不穷,特别是具有表面特异性的功能材料的出现,如:超亲水材料、超疏水材料、超双疏材料等,为减阻降噪方面的研究提供了新的和更多的选择.……

关键词：声学方法功能材料表面阻力特性测量 acoustic method 流噪声减阻降噪声纳导流罩超疏水材料拖曳声纳亲水材料节约能源材料科学表面材料阻力降特异性可再生工作者低阻力超双疏

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