scholarly journals Spectral energy analysis of bulk three-dimensional active nematic turbulence

Soft Matter ◽  
2020 ◽  
Vol 16 (39) ◽  
pp. 9059-9068
Author(s):  
Žiga Krajnik ◽  
Žiga Kos ◽  
Miha Ravnik
Keyword(s):  
Energy Spectrum ◽  
Spectrum Analysis ◽  
Energy Analysis ◽  
Three Dimensional ◽  
Flow Fields ◽  
Spectral Energy ◽  
Geometrical Analysis ◽  
Energy Spectrum Analysis

Energy spectrum analysis of 3D active nematic turbulence is perfomed and combined with geometrical analysis of ordering and flow fields.

Fracture Failure Research on Feculence Discharge Pipe of LPG Spherical Tanks

2014 ◽  
Author(s):  
Wang Chen ◽  
Chen Jin ◽  
Cai XiaoHui ◽  
Wang YinPei
Keyword(s):  
Energy Spectrum ◽  
Spectrum Analysis ◽  
Sem Analysis ◽  
Corrosion Products ◽  
Welding Residual Stress ◽  
Liquefied Petroleum Gas ◽  
Metallographic Examination ◽  
Fracture Failure ◽  
Energy Spectrum Analysis ◽  
Discharge Pipe

The rupturing of feculence discharge pipe happened during the gas-tightness test of LPG (Liquefied petroleum gas) spherical tanks. In order to find out the reasons of fracture failure of feculence discharge pipe, the Scanning electron microscopy (SEM) analysis, mechanical property testing, metallographic examination and energy spectrum analysis of corrosion products were used. The examination results show that both chemical composition and metallographic structure are normal, and the cracking is the brittle cleavage fracture. The energy spectrum analysis of corrosion products reveals that there are many sulfides in the corrosion products. Based on the loading conditions of spherical tanks, crack morphology and corrosion products, the primary reason of pipe cracking is stress corrosion cracking induced by H2S existed in liquefied petroleum gas. So it is suggested that the examination should be fulfilled for the feculence discharge pipe of such spherical tanks, the cracked pipes should be replaced, and the welding residual stress in the pipes should be relieved before replacing operation.

scholarly journals Improved PRF‐based MR thermometry using k‐space energy spectrum analysis

2020 ◽  
Vol 84 (6) ◽  
pp. 3325-3332
Author(s):  
Shenyan Zong ◽  
Guofeng Shen ◽  
Chang‐Sheng Mei ◽  
Bruno Madore
Keyword(s):  
Energy Spectrum ◽  
Spectrum Analysis ◽  
Mr Thermometry ◽  
Energy Spectrum Analysis

Experimental Research on Energy Spectrum Analysis on Chips from Aeroengine Oil System

2014 ◽  
Vol 635-637 ◽  
pp. 957-961
Author(s):  
Chun Guang Li ◽  
Xiao Ming Ma ◽  
Hai Jun Tang
Keyword(s):  
Energy Spectrum ◽  
Spectrum Analysis ◽  
Energy Dispersive Spectrometer ◽  
Engineering Practice ◽  
Energy Spectrum Analysis ◽  
Analysis Technique ◽  
Metal Chips ◽  
Spectrum Curve ◽  
Appearance Feature ◽  
Electronic Microscope

Inspection on chips from oil system is an important method for modern aeroengine condition monitoring. Energy spectrum analysis technique is the most widely used and effective method in inspection on metal chips. In this method, size and quantity of chips are observed by scanning electronic microscope and qualitative and quantitative analysis of element contents are finished by energy dispersive spectrometer. Through above experiments, material type of metal chips can be analyzed and material mark can be determined by comparison with the materials list used in the aeroengine. In this article, characteristics and advantages of energy spectrum analysis technology are systematically introduced and typical appearance feature and energy spectrum curve of common l chips are summarized in engineering practice. In addition, problems and prospects of energy spectrum analysis technique are proposed.

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