A mathematical model for wave propagation in a composite solid matrix containing two immiscible fluids

Constitutive relations and field equations have been extended for a porous medium composed of two solids and containing two chemically non-reactive immiscible fluids. By generalizing the closure relation of porosity change and employing this into the mass balance equations, the stress–strain relations have been developed. The idea of generalized compressibility tests is invoked to find the value of dimensionless parameters appearing in the closure relation of porosity change. By generalizing momentum balance equations of Lo et al. (Water Resour Res 41:1–20, 2005), the propagation of dilatational and rotational waves is explored. It is found that four dilatational and two rotational waves exist in the porous medium. In contrast to Biot’s theory, the presence of the second fluid and second solid in the porous medium gives rise to additional P- and S-waves. Variation of phase speeds and corresponding attenuation coefficients of existing waves versus frequency, saturation of the fluid phases and solid fraction are computed numerically and depicted graphically.     

Deep Convolutional Neural Network for Graphics Forgery Detection in Video

Wireless Personal Communications - Doctored video generation with easily accessible editing software has proved to be a major problem in maintaining its authenticity. Nowadays, deep neural networks...     

A passive approach for the detection of splicing forgery in digital images

Multimedia Tools and Applications - With the technology progress, a plethora of freely accessible software has questioned the authenticity of digital images. This field is continuously creating...     

Image and Video Forensics: A Critical Survey

With the extensive use of multimedia on internet and easy approachability of powerful image and video editing software, doctored visual contents have been extensively appearing in our electronic-mail in-boxes, Whatsapp, Facebook or any other social media. Recently, attempting blind tampering in visual contents have been progressively adopted. This paper presents a collaborative survey on detection of such attempts. Our aim is to establish an effective path, for researchers working in the field of image and video forensics, to unfold new aspects of forgery. This paper will avail the comprehensive study that will assist the researchers to go through the various challenges encountered in the previous work. The focus of this paper is to review the splicing and copy–move forgery detection methods in images as well as inter and intra-frame forgery challenges in videos, highlighting the commonly used datasets and hence assisting new researchers to work on with. The efficacy of the paper is that such collaborative survey under one umbrella is not available yet.

     

Breast tumour detection using machine learning: review of selected methods from 2015 to 2021

Multimedia Tools and Applications - Breast tumour is one of the leading causes of death among women worldwide. Researchers are working hard to develop early and improved detection tools for breast...     

Correlation of interlayer diffusion with the stoichiometric composition of RF sputtered Pt/Co/Pt sandwiched structures

Sandwiched structures comprising Pt/Co/Pt layers with varying cobalt deposition time was studied and its importance on the alloy composition, by correlating the effective interlayer diffusion with the atomic stoichiometry, has been presented. A structural phase transition from ordered L1₂ CoPt₃ –? L1₀ CoPt –? L1₂ Co₃Pt was observed with increasing Co deposition time after annealing at 700 °C. The cross-sectional SEM image of the as-deposited film clearly shows a cobalt layer sandwiched between platinum layers. Rutherford back scattering (RBS) analysis shows a multipeak signature for the as-deposited films. A detailed RBS investigation on the extent of interatomic diffusion reveals an equiatomic composition for 20 and 30 min deposition time after annealing. The equiatomic CoPt phase shows a magnetically hard behaviour with a maximum coercivity of 15000 Oe. The reported dependence of (BH)_max on coercivity concludes that by tailoring an additional parameter of deposition time, diverse combinations of structural and magnetic properties can be achieved for appropriate practical applications.     

A secure image encryption algorithm based on fractional transforms and scrambling in combination with multimodal biometric keys

Multimedia Tools and Applications - In today’s digital world, security is a preeminent element in the transmission of digital images. In this paper, image encryption algorithm is proposed...     

Pain detection from facial expressions using domain adaptation technique

Pattern Analysis and Applications - Pain management is gaining the attention of clinical practitioners to relieve patients from pain in an effective manner. Pain management is primarily dependent...     

Glycerol conversion over palladium- and alumina-impregnated KIT-6 for the production of gasoline range hydrocarbons

The use of large pore size catalyst with high surface area is explored in this work by using KIT-6 silica-based mesoporous material for the conversion of glycerol to higher hydrocarbons. Palladium and alumina were incorporated into the KIT-6 for providing Lewis acid sites and removal of oxygen. A decrease in surface area and pore diameter was observed with the incorporation of alumina and palladium on KIT-6. Ethanol was used as diluent as glycerol is viscous in nature and has issues related to flow in the preheater. An increase in the conversion was observed from 78 to 93.7% with the increase in temperature from 400 to 700 °C; however, the liquid yield was observed to decrease above 600 °C. GC (FID) analysis showed that the maximum values (38.9%) for gasoline range hydrocarbons fraction were obtained at 550 °C. No significant effect was observed on the liquid-phase yield with the addition of palladium; however, it was observed that the liquid product obtained in the presence of palladium has higher H/C ratio, indicating the formation of paraffinic compounds and removal of oxygen. GC/MS analysis showed the presence of mostly oxygenated long-chain hydrocarbons.