High‐Sensitivity Piezoelectric Transducer for Wave Velocity Measurements in Shock Tubes

1967 ◽  
Vol 38 (7) ◽  
pp. 971-972 ◽  
Author(s):  
L. Bernstein ◽  
R. O. Goodchild
Author(s):  
Ritobrata Sur ◽  
Shengkai Wang ◽  
Kai Sun ◽  
David F. Davidson ◽  
Jay B. Jeffries ◽  
...  
Keyword(s):  

2013 ◽  
Vol 405-408 ◽  
pp. 470-473
Author(s):  
Sheng Jie Di ◽  
Ming Yuan Wang ◽  
Zhi Gang Shan ◽  
Hai Bo Jia

A procedure for evaluating liquefaction resistance of soils based on the shear wave velocity measurements is outlined in the paper. The procedure follows the general formal of the Seed-Idriss simplified procedure. In addition, it was developed following suggestions from industry, researchers, and practitioners. The procedure correctly predicts moderate to high liquefaction potential for over 95% of the liquefaction case histories. The case study for the site of offshore wind farm in Jiangsu province is provided to illustrate the application of the proposed procedure. The feature of the soils and the shear wave velocity in-situ tested in site are discussed and the liquefaction potential of the layer is evaluated. The application shows that the layers of the non-cohesive soils in the depths 3-11m may be liquefiable according to the procedure.


2010 ◽  
Vol 116 (1) ◽  
pp. c60-c64 ◽  
Author(s):  
M.K. Sigrist ◽  
G. Chiarelli ◽  
A. Levin ◽  
A. Romann ◽  
C. Weber

Author(s):  
V. V. Genkel ◽  
R. G. Portnova ◽  
T. V. Antipina ◽  
I. I. Shaposhnik

Aim.  To study muscular (brachial and radial arteries) and elastic (aorta) regional arterial stiffness in IBD patients in comparison with those without IBD, as well as to establish the relationship between arterial stiffness and the characteristics of the IBD course (the duration of illness, severity of attack, activity of systemic inflammation). Materials and methods. The study included 21 IBD patients and 30 patients in the comparison group. The values of regional aortic and muscular arterial stiffness were measured by applanation tonometry. The carotid–femoral pulse wave velocity (cfPWV) and the carotid-radial pulse wave velocity (crPWV) were determined. The laboratory research plan included the analysis of complete blood count, biochemical parameters, fibrinogen and a high sensitivity  C-reactive protein (hsCRP).Results. crPWV, similar to cfPWV, was not significantly different between the groups. At the same time, the proportion of individuals with an increase in the cfPWV of more than 10 m/s was higher in the group of IBD patients. However, these differences did not reach the level of statistical significance. According to the results of the correlation analysis, the increase in cfPWV was associated with an increase in patient age (r = 0.564; p = 0.01), the duration of IBD history (r = 0.628; p = 0.003), fasting plasma glucose (r = 0.367; p = 0.034) and GFR decrease (r = -0.482; p = 0.031). The crPWV also directly correlated with the IBD duration (r = 0.630; p = 0.003). According to the results of the regression analysis, an increase in the IBD duration by 1 year is associated with an increase in cfPWV by 0.205 m/s, i.e. the increase in the IBD duration by 5 years is associated with an increase in the cfPWV of approximately 1 m/s.Conclusion. In IBD patients, the duration of the disease directly correlated with an increase in cfPWV and crPWV. The increase in the IBD duration by 1 year was associated with an increase in cfPWV by 0.205 m/s. The muscular and elastic regional arterial stiffness was not statistically significantly different between IBD patients and the comparison group. 


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