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Micro-seismic signal propagation of low attenuation

Xiao Jian,Sun Shuting,Liu Jianzhong

Strategic Study of CAE 2014, Volume 16, Issue 8,   Pages 83-87

Abstract: text-align: justify;">This article explored the possibility of spread of weak seismic signals and low attenuationpropagation medium showed a degree of elasticity，the vibration signal amplitude，just below the elastic limit attenuationis very small，showing low attenuation characteristics.

Keywords： micro-seismic     low attenuation     inelastic attenuation    

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Application of gamma-ray attenuation technology in density measurement of a slurry reactor

Jian XU, Weisheng WEI, Kai ZHANG

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 4,   Pages 486-490 doi: 10.1007/s11705-010-0509-6

Abstract: density profile of the gas-liquid-solid mixture in a slurry bubble column was measured by gamma-ray attenuationSeveral measures for improving measurement precision were presented based on the discussion on attenuationcolumn decreases with the increase of column height, which indicates that the measurement by gamma-ray attenuation

Keywords： slurry reactor     axial density distribution     gamma-ray attenuation technology    

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microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 2, doi: 10.1007/s11783-021-1457-8

Abstract:

•Bio-RD-PAO can effectively and extensively remove organohalides.

Keywords： Bio-RD-PAO     Microbial reductive dehalogenation     Persulfate     Organohalide respiration     Complete attenuation    

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Attenuation mechanism of

Yuanqiang ZHENG,Yanchun SHI,Chang AN,Ruisheng LI,Dongjun LIU,Yuehua KE,Kairong MAO,Mingjuan YANG,Zeliang CHEN,Shorgan BOU

Frontiers of Agricultural Science and Engineering 2014, Volume 1, Issue 4,   Pages 331-340 doi: 10.15302/J-FASE-2014032

Abstract: The attenuation mechanism of these strains remains largely unknown.These data indicate that changes in some cog categories and virulence genes might result in the attenuationThese attenuation mechanisms also have implications for screening and development of new vaccine strains

Keywords： Brucella     live attenuated vaccine     attenuation     differential diagnosis    

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evaluation of extinguishing concentration of superfine ammonium phosphate extinguishing agent by laser attenuation

Yin Zhiping,Liu Aihua,Pan Renming

Strategic Study of CAE 2008, Volume 10, Issue 7,   Pages 90-95

Abstract: different particle sizes had been done by means of filtering and weighing method combined with laser attenuationThe fitting curves of particle concentration with laser attenuation rate and the extinguishing concentrationThe laser attenuation measurement relative errors were less when the former agent was used in experiment

Keywords： laser attenuation measurement     filtering and weighing method     superfine particle extinguishing agent    

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Experimental study on wire breakage detection by acoustic emission

Limin SUN, Ji QIAN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 4,   Pages 503-509 doi: 10.1007/s11709-011-0132-8

Abstract: In the experiments, the attenuation laws of waveform amplitudes were discussed based on stress wave propagationFinally, based on the waveform attenuation laws and the linear position method, the amplitude and energyillustrated that the stress wave from different sources has a different frequency spectrum, and the amplitude attenuationfactor varied with the stress wave frequency; high frequency waves had a greater attenuation factor.and thus, the wire breakage signal can be distinguished from the other source by comparing the non-attenuation

Keywords： acoustic emission (AE)     waveform     wire breakage     attenuation factor     wave velocity    

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Study on Several Radio Propagation Models in ITU - R Recommendations

Zhang Minggao

Strategic Study of CAE 2000, Volume 2, Issue 7,   Pages 74-78

Abstract: telecommunications, conversion method for ionosphereic scintillation fading, simplified prediction method for attenuation

Keywords： radio propagation     tropospheric scatter     sea reflection     ionospheric scintillation     attenuation by atmospheric    

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Performance analysis for a two-way relaying power line networkwith analog network coding

Yu-wen QIAN,Meng TIAN,Xue JIANG,Hua-ju SONG,Feng SHU,Jun LI

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 10,   Pages 892-898 doi: 10.1631/FITEE.1500135

Abstract: In this paper, we investigate a two-way relaying power line communication (PLC) network with analog network coding. We focus on the analysis of the system outage probability, symbol error rate, and average capacity. Specifically, we first derive the probability density function (PDF) of the received signal-to-noise ratio (SNR) with a closed form, by exploiting the statistical properties of the PLC channel. Then with the help of this PDF, we develop the outage probability, symbol error rate, and average capacity with closed forms, based on the Hermite polynomial. Simulations show that the derived analytical results are consistent with those by Monte Carlo simulation.

Keywords： Power line communication     Outage probability     Symbol error rate     Signal attenuation    

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Numerical Modeling of Water Waves Interaction With Soft Mud Beds: Based on an Empirical Rheology Model Featured by Hysteresis Loop

Qi Peng,Hou Yijun

Strategic Study of CAE 2006, Volume 8, Issue 4,   Pages 39-45

Abstract:

On the basis of the semi-empirical rheology model of soft mud under such oscillatory external forces as water waves, a vertical 2-D numerical model is developed for simulating the interaction between surface water waves and underlying soft mud beds. The rheology model used is featured by remarkable hysteresis loops in the relationships of shear strain versus shear stress and the rate of shear strain versus shear stress and strong nonlinearity. A logarithmic grid from the water-mud interface in the vertical direction is employed for numerical treatment, which increases the resolution of the flow in the neighborhood of both sides of the interface, thus contributes to reproducing the characteristics of wave boundary. Model verifications are given through comparisons between the calculated and the measured bed mud mass transport velocities as well as the rate of decay of surface wave heights.

Keywords： mud mass transport     wave attenuation     soft mud bed     rheological model    

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Target height and multipath attenuation joint estimation with complex scenarios for very high frequency Research Articles

Sheng CHEN, Yongbo ZHAO, Yili HU, Chenghu CAO, Xiaojiao PANG

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6,   Pages 937-949 doi: 10.1631/FITEE.2100003

Abstract: To deal with this problem, we propose an algorithm of target height and multipath attenuation joint estimationdirect and reflected signals are searched as the same part, and this represents the multipath phase attenuation

Keywords： Low-angle estimation     Very high frequency (VHF) radar     Complex scenarios     Multipath effect     Height estimation    

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The issues related to determination of site specific design ground motion for nuclear power plants in China

Li Xiaojun,He Qiumei,Hou Chunlin

Strategic Study of CAE 2013, Volume 15, Issue 4,   Pages 75-82

Abstract: ground motion for nuclear power plants, including the seismic hazard analysis methods, the ground motion attenuationThe countermeasure change was analyzed to consider the uncertainty of ground motion attenuation relationand the ground motion attenuation relation of diffuse earthquake; the differences were discussed between

Keywords： nuclear power plant     design ground motion     deterministic method     probabilistic method     ground motion attenuation    

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Title Author Date Type Operation

Micro-seismic signal propagation of low attenuation

Xiao Jian,Sun Shuting,Liu Jianzhong

Journal Article

Application of gamma-ray attenuation technology in density measurement of a slurry reactor

Jian XU, Weisheng WEI, Kai ZHANG

Journal Article

microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation

Journal Article

Attenuation mechanism of

Yuanqiang ZHENG,Yanchun SHI,Chang AN,Ruisheng LI,Dongjun LIU,Yuehua KE,Kairong MAO,Mingjuan YANG,Zeliang CHEN,Shorgan BOU

Journal Article

evaluation of extinguishing concentration of superfine ammonium phosphate extinguishing agent by laser attenuation

Yin Zhiping,Liu Aihua,Pan Renming

Journal Article

Experimental study on wire breakage detection by acoustic emission

Limin SUN, Ji QIAN

Journal Article

Study on Several Radio Propagation Models in ITU - R Recommendations

Zhang Minggao

Journal Article

Performance analysis for a two-way relaying power line networkwith analog network coding

Yu-wen QIAN,Meng TIAN,Xue JIANG,Hua-ju SONG,Feng SHU,Jun LI

Journal Article

Numerical Modeling of Water Waves Interaction With Soft Mud Beds: Based on an Empirical Rheology Model Featured by Hysteresis Loop

Qi Peng,Hou Yijun

Journal Article

Target height and multipath attenuation joint estimation with complex scenarios for very high frequency

Sheng CHEN, Yongbo ZHAO, Yili HU, Chenghu CAO, Xiaojiao PANG

Journal Article

The issues related to determination of site specific design ground motion for nuclear power plants in China

Li Xiaojun,He Qiumei,Hou Chunlin

Journal Article