A note on the boundary value problem arising in free convection in porous media

By similarity transformation and governing equations of free convection on a heated vertical plate embedded in porous medium are reduced to coupled nonlinear equations. The equations are numerically integrated using the boundary conditions at the plate and at ‘infinity’. Assuming that the plate is subjected to a prescribed temperature [1–3] or to a prescribed heat flux [4, 5], the boundary value problems have been solved independently. These researchers seem to have not noted that the solutions for the two cases are dependent on each other. In the present note we consider yet another thermal boundary condition, namely, radiation boundary condition [6] at the plate and show that the solutions for the three cases are dependent and one can pass from one solution to the other easily.     

Retraction Note to: A novel Gini index decision tree data mining method with neural network classifiers for prediction of heart disease

Design Automation for Embedded Systems -     

Fatigue crack growth resistance of gas tungsten arc,electron beam and friction stir welded joints of AA2219 aluminium alloy

AA2219 aluminium alloy square butt joints without filler metal addition were fabricated using gas tungsten arc welding (GTAW), electron beam welding (EBW) and friction stir welding (FSW) processes. The effect of three welding processes on fatigue crack growth behaviour is reported in this paper. Transverse tensile properties of the welded joints were evaluated. Microstructure analysis was also carried out using optical and electron microscopes. It was found that the FSW joints are exhibiting superior fatigue crack growth resistance compared to EBW and GTAW joints. This was mainly due to the formation of very fine, dynamically recrystallised grains and uniform distribution of fine precipitates in the weld region.     

Mitigate Black Hole Attack Using Hybrid Bee Optimized Weighted Trust with 2-Opt AODV in MANET

Wireless Personal Communications - A Mobile Ad hoc Network (MANET) is susceptible to several security threats. This work aims at securing a MANET against black hole attacks. Based on MANET...     

Noise Reduction in VCSEL Based Wavelength Division Multiplexing System

Wavelength division multiplexing (WDM) technique plays a vital role in optical fiber communication. In this paper, a 4?×?1 WDM system has been developed with Vertical Cavity Surface Emitting LASER as optical source for each input. The performance analysis has been carried for Non Return to Zero (NRZ), hyperbolic secant, Gaussian and impulse generators over complex WDM optical fiber up to 50 km with less attenuation of 0.2 dB/Km. The Signal to noise ratio of received signal through Avalanche Photo diode in the receiver is calculated. This work identifies the best pulse generator with reduced noise performance suitable for the proposed system. The proposed system is modeled in optisys13 and insightful discussions are provided from the simulated results.

     

Influences of Functionalized Nanoclays on Morphology and Mechanical Properties of Polyvinyl Alcohol-Based Composites by Twin-Screw Extruder

Polyvinyl alcohol-based nanocomposites filled with different weight percentage of functionalized nanoclays were prepared by melt processing with a twin-screw extruder. The effective incorporation of amine-modified bentonite nanoclays in the PVA matrix leads to the increase in thermal stability, stress–strain properties. The effect of the addition of functionalized nanoclays in PVA matrix exhibits intercalated nanocomposite structure. The thermal decomposition (T_d) temperature of the composites increases up to 30°C, than pristine PVA. The morphology influences were studied by TEM. These clay nanocomposite films could be useful for wound dressing material and for enhancing the moisture absorbance properties.     

Fault Detection and Diagnosis of Cyber-Physical System Using the Computer Vision and Image Processing

Wireless Personal Communications - This paper investigates the performance of an energy-harvesting (EH) relay network, where multiple sources communicate with a destination via multiple EH...     

Effects of cisplatin on testicular functions in rats

Reflexes evoked by applying non-painful taps to an incisor tooth were recorded bilaterally from the jaw-closing masseter and temporal muscles of 21 humans. A series of inhibitory, excitatory, inhibitory and excitatory waves (the Q, R, S and T waves) appeared in full-wave rectified and averaged post-stimulus electromyograms. These reflex responses were affected by the participants' levels of attention. When they undertook mental exercises in the form of arithmetic calculations, increases in electro-myographic activity were found around the transitions between the Q and R and the S and T waves. These increases involved principally a shortening of the inhibitory Q and S waves. There was no significant difference between the occurrence of these effects in the QR and ST segments. However, the effects were seen more commonly when the reflexes were evoked by hard (7.4 mN.s) as opposed to soft (3.4 mN.s) taps. It is concluded that, in man, attentional factors can modulate both short- and long-latency jaw reflexes, particularly when these are evoked by higher-threshold afferent nerves.     

Free convection about a wedge and a cone subjected to mixed thermal boundary conditions

Summary The paper deals with a similarity analysis of free convection about a wedge and a cone which are subjected to mixed thermal boundary conditions. The governing equations and the boundary conditions are reduced to a boundary value problem involving a non-negative parameterm which assumes the values 0,1 and for the cases of prescribed temperature, prescribed heat flux and radiation boundary condition. A numerical solution has been computed for the case of radiation boundary condition. The results for constant temperature and constant heat flux available in literature are deduced with the aid of a simple transformation. Critical cases have been found for which the solution is same for all values ofm.Notation a ₀,a ₁,a ₂ coefficients defined in Eq. (5) - A transition parameter used in Eq. (16) - c coefficient ofC in Eq. (7) - C function ofx defined in Eq. (7) - f dimensionless stream function - g acceleration due to gravity - g ₁ =g cos - G function ofx defined in Eq. (7) - m constant defined in Eq. (12) - n = 0 for wedge = 1 for cone - PHF prescribed heat flux - Pr Prandtl number - PT prescribed temperature - r =x sin - RBC radiation boundary condition - T temperature - T _e ambient temperature - u velocity component inx-direction - v velocity component iny-direction - x distance from the vertex measured along the surface - y distance normal to the surface - coefficient of thermal expansion - dimensionless similarity variable - dimensionless temperature - exponent inC in Eq. (7) - kinematic viscosity - semivertical angle - stream function     

Blockchain Assisted Disease Identification of COVID-19 Patients with the Help of IDA-DNN Classifier

Wireless Personal Communications - Globally, millions of people were affected by the Corona-virus disease-2019 (COVID-19) causing loads of deaths. Most COVID-19 affected people recover in a few...