Wave attenuation characteristics of the 11.5 GHz Earth-space path in Warsaw region

1993 ◽  
Vol 48 (5-6) ◽  
pp. 277-282
Author(s):  
Arnold Kawecki
Keyword(s):  
Wave Attenuation ◽  
Earth Space ◽  
Attenuation Characteristics

scholarly journals Coda Wave Attenuation Characteristics for North Anatolian Fault Zone, Turkey

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Fadime Sertcelik ◽  
Mehmet Guleroglu
Keyword(s):  
Fault Zone ◽  
Wave Attenuation ◽  
Active Faults ◽  
North Anatolian Fault ◽  
Coda Wave ◽  
North Anatolian Fault Zone ◽  
The Past ◽  
Coda Wave Attenuation ◽  
Large Earthquakes ◽  
Attenuation Characteristics

AbstractNorth Anatolian Fault Zone, on which large earthquakes have occurred in the past, migrates regularly from east to west, and it is one of the most active faults in the world. The purpose of this study is to estimate the coda wave quality factor (

Coda wave attenuation characteristics for Kumaon and Garhwal Himalaya, India

2014 ◽  
Vol 75 (2) ◽  
pp. 1057-1074 ◽  
Author(s):  
Ashvini Kumar ◽  
A. Sinvhal ◽  
A. Joshi ◽  
D. Kumar ◽  
Sandeep ◽  
...  
Keyword(s):  
Wave Attenuation ◽  
Garhwal Himalaya ◽  
Coda Wave ◽  
Coda Wave Attenuation ◽  
Attenuation Characteristics

A Finite Element Approach for Study of Wave Attenuation Characteristics of Epoxy Polymer Composite

2018 ◽  
Author(s):  
Shank S. Kulkarni ◽  
Alireza Tabarraei ◽  
Pratik P. Ghag
Keyword(s):  
Finite Element ◽  
Polymer Composite ◽  
Polymer Matrix ◽  
Wave Attenuation ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Element Model ◽  
Loading Frequency ◽  
Macroscopic Properties ◽  
Attenuation Characteristics

The properties of the inclusions, viz. size, shape, and distribution significantly affect macroscopic properties of a polymer composite. Finite element (FE) modeling provides a viable approach for investigating the effects of the inclusions on the macroscopic properties of the polymer composite. In this paper, finite element method is used to investigate ultrasonic wave propagation in polymer matrix composite with a dispersed phase of inclusions. The finite element models are made up of three phases; viz. the polymer matrix, inclusions (micro constituent), and interphase zones between the inclusions and the polymer matrix. The analysis is performed on a three dimensional finite element model and the attenuation characteristics of ultrasonic longitudinal waves in the matrix are evaluated. The attenuation in polymer composite is investigated by changing the size, volume fraction of inclusions, and addition of interphase layer. The effect of loading frequency of the wave on the attenuation characteristics is also studied by varying the frequency in the range of 1–4 MHz. Results of the test revealed that higher volume fraction of inclusions gave higher attenuation in the polymer composite as compared to the lower volume fraction model. Smaller size of inclusions are preferred over larger size as they give higher wave attenuation. It was found that the attenuation characteristics of the polymer composite are better at higher frequencies as compared to lower frequencies. It is also concluded that the interphase later plays a significant role in the attenuation characteristics of the composite.

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