An ultrasonic method for determination of acoustic impedance, time of flight, and attenuation of a thin linear-viscoelastic layer

2007 ◽  
Vol 102 (10) ◽  
pp. 104903 ◽  
Author(s):  
Gui-Jin Yao ◽  
Zhi-Wen Cui ◽  
Ruo-Long Song ◽  
Ke-Xie Wang
Keyword(s):  
Acoustic Impedance ◽  
Ultrasonic Method ◽  
Time Of Flight ◽  
Viscoelastic Layer ◽  
Linear Viscoelastic

Viscoelastic Effects in Birefringent Coatings

1961 ◽  
Vol 28 (4) ◽  
pp. 601-607 ◽  
Author(s):  
P. S. Theocaris ◽  
C. Mylonas
Keyword(s):  
Epoxy Resins ◽  
Viscoelastic Behavior ◽  
Viscoelastic Layer ◽  
Pure Epoxy ◽  
Plastic Surface ◽  
Viscoelastic Effects ◽  
Linear Viscoelastic ◽  
Relaxation Curves ◽  
Viscoelastic Coatings

The method of birefringent coatings for the determination of elastic and plastic surface strains of opaque bodies like metals assumes perfect elasticity of the coating material. In reality the coating, assumed much softer than the metal, presents the problem of a general viscoelastic layer under prescribed boundary displacements (at the metal-plastic interface). As already shown, this problem is greatly simplified for isotropic linear viscoelastic coatings, for small strains, for a linear law of strain birefringence, and for interface displacements expressed as a product of a function of space co-ordinates by a time function. The obviously advantageous stress-strain-optical linearity was experimentally verified in pure and in plasticized epoxy resins which make the best coatings. Tests were carried out in uniaxial loading and in shear, in creep, as well as in relaxation. The main conclusion is that the pure epoxy resins show negligible inelasticity, and the plasticized have a linear photo-viscoelastic behavior. Explicit laws were fitted to the creep and relaxation curves. Tests were also carried out with deeply notched coated steel bars deformed in the plastic range. The variation of fringe pattern with time was found to be negligible for the pure epoxy resins and to diminish slightly and proportionally with time throughout the model for the plasticized resins.

Lumas-30 time-of-flight mass spectrometer with pulsed glow discharge for direct determination of nitrogen in steel

2011 ◽  
Vol 66 (14) ◽  
pp. 1411-1416 ◽  
Author(s):  
A. A. Ganeev ◽  
A. R. Gubal’ ◽  
V. I. Mosichev ◽  
N. V. Pershin ◽  
S. N. Petrov ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Mass Spectrometer ◽  
Time Of Flight ◽  
Direct Determination ◽  
Pulsed Glow Discharge ◽  
Flight Mass Spectrometer

scholarly journals Rapid determination of N-methylpyrrolidine in cefepime by combining direct infusion electrospray ionisation-time-of-flight mass spectrometry with field asymmetric waveform ion mobility spectrometry

2015 ◽  
Vol 7 (1) ◽  
pp. 34-39 ◽  
Author(s):  
Robert W. Smith ◽  
Lisa B. Cox ◽  
Aswandi Yudin ◽  
James C. Reynolds ◽  
Mark Powell ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Rapid Determination ◽  
Time Of Flight ◽  
Asymmetric Waveform ◽  
Direct Infusion ◽  
Electrospray Ionisation ◽  
Flight Mass Spectrometry

FAIMS separation prior to mass spectrometry enables selective transmission of NMP in cefepime without interference from NMP formed by in-source CID.

Sign in / Sign up

Export Citation Format

Share Document