Search

This study is mainly focused on the behavior change of shear waves. These waves propagate through an inhomogeneous sandwiched water-saturated porous layer in between inhomogeneous elastic layer and inhomogeneous sandy half space under the assumption of non-local theory. Different types of inhomogeneities based on the depth of the layers have been considered in terms of elastic moduli and densities of the medium. Due to the availability of fluid in the second layer, we consider loose bonding at the interfaces in between these three layers, as fluid movement through the interfaces may be possible. A complex dispersion equation has been derived with respect to the boundary conditions. Real and imaginary parts of the dispersion equation provide us with the phase velocity of shear wave and dissipation due to loose bonding at the interfaces, respectively. This dispersion equation has been solved numerically with the help of Newton Raphson method. For validation of the present problem, the numerical solution of dispersion equation has been depicted here graphically in terms of phase velocity c c 2 of shear wave vs. non-dimensional wave number k H 1 (where k is the wave number and H 1 is the thickness of the second porous layer). Also, we discuss about the impact of depth ratios, inhomogeneity of the medium, non-local parameters, loose bonding, and porosity of the sandwiched layer on the propagation of the shear wave. [ABSTRACT FROM AUTHOR]

In the automobile sector, the new advancements in technology help the vendors in developing smart vehicles. These smart vehicles are designed to provide all sort of comfort to the society. But still, some improvements are required to make these vehicles smarter in terms of environmental pollution management. The other cause of air pollution is due to the toxic gases released by the industries. The environment pollution is still increasing gradually despite the various efforts of government. A number of solutions are available in the literature to control and monitor environmental pollution. The examination uncovers that there is a necessity of a sensor based embedded system that can screen and control the air contamination with generation of challan from anyplace in the world using IOT. An embedded system prototype has been designed on the concept of an internet of things scenario that uses sensors and actuators around Raspberry Pi board. The system prototype is programmed in python using some standard libraries available on adafruit and github. A web page is also designed to monitor the level of gases remotely at any place in the world. The results demonstrate that the complete system has been successfully tested and implemented. [ABSTRACT FROM AUTHOR]

As the technology is advancing day by day, the need of high performance devices is also increasing. High performance is achieved at the expense of high power dissipation. Nowadays, field programmable gate arrays (FPGAs) are widely used in wireless communication systems due to their low non-recurring cost and high operating speed. There are many high performance applications (i.e., image processing, digital signal processing, wireless transceivers etc.) in which FPGAs are widely used. However, their complex architectures lead to high power consumption. Estimation of power in the early stage of the design flow would help designers to design the systems as per specified power budget. Therefore, two different approaches for power estimation are proposed in this paper. First is the heuristic approach based on back propagation neural network and second is the regression based statistical approach. It is observed that heuristic approach is better as compared regression in terms of power estimation of most of the digital circuits considered in this work. [ABSTRACT FROM AUTHOR]

The present study is mainly focused on understanding the effect of cracks on the energy share of an incident wave at the interface between a cracked poroelastic solid containing single fluid and a porous solid containing two immiscible viscous fluids. We assume that both the media are dissipative due to presence of viscosity in pore fluids. The analysis is based on Snell's law for the reflection and refraction of an incident wave from the common boundary of these two media. The proposed model is solved for the propagation of harmonic plane waves with the help of the Helmholtz technique. After solving the elastodynamical equations, we find three attenuated reflected waves and four attenuated refracted waves. The propagation of an attenuated wave in the respective dissipative medium defined as an inhomogeneous propagation of a wave, is represented through the propagation and the attenuation directions. These inhomogeneous waves propagate through the cracked poroelastic solid and are incident at a point on the interface. The phase velocities and attenuation coefficients are calculated for the propagation of each inhomogeneous wave. The expressions of reflection and refraction coefficients and energy share of each of the reflected and refracted waves for a given incident wave are obtained in closed form and computed numerically in the present study. Numerical examples are considered for the partition of incident energy in which we have studied the presence and absence of cracks in poroelastic solid with single fluid, effect of crack density, saturation parameter and Poisson's ratio for the cracked poroelastic solid. [ABSTRACT FROM AUTHOR]