Cross-Layer Design of Dynamic Link Prediction Power Control Algorithm in Wireless Ad hoc Networks

In wireless communication era, Dynamic Link Prediction based Cross-Layer Power Control Algorithm (DLP-CLPCA) in wireless ad hoc networks provides a joint solution for the power consumption protocol as well as nodes link availability.  The Conventional design of ad-hoc network protocols is built on the standard OSI model which has failed to relate with RSS problems, whereas the physical, datalink, network and transport layer has been influenced.  Due to this, the early unavailability of nodes occurs and frequent route break during the transmission. To overcome the constraint, developed the Dynamic Link Prediction based Cross-Layer Power Control Protocol to forecast the route earlier maximizes the link availability and create the optimum routing path during the transmission. The proposed link prediction algorithm is implemented in NS-2 simulator with the performance metrics as throughput, delay and energy consumption as a parameter values

Adsorption of Chromium Ions by Acid Activated Low Cost Carbon-Kinetic,Thermodynamic and Equilibrium Studies

A carbonaceous adsorbent prepared from an indigenous waste, by acid treatment was tested for its efficiency in removing metal ions. The process parameters studied include agitation time, initial metal ions concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intra-particle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were found to around 30 mg/g at an initial pH of 7.0. The temperature variation study showed that the metal ions adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the metal ion solutions. The Langmuir and Freundlich adsorption isotherms obtained, positive ΔH0 value, pH dependent results and desorption of metal ions in mineral acid suggest that the adsorption of metal ions on BBC involves chemisorption as well as physisorption mechanism

Experimental studies of propeller induced flow over typical micro air vehicle - AIAA 2013-0060

An experimental study has been carried out to explore the effect of propeller induced slipstream on the flow field of a fixed wing micro air vehicle (MAV). Tests were conducted at freestream velocity of 10m/s, corresponding to Reynolds number based on root chord of about 160000. Flow pattern on the surface of MAV planform with propeller-on and off condition was captured using oil flow visualization at four angles of incidence. Mean flow field on the MAV planform at four chordwise planes with propeller-on and off condition were measured using stereo PIV technique at angle of incidence of 24°. Little difference has been seen on the oil flow pattern at 10° and 15° angle of incidence between propeller-off and on condition. Small asymmetry in the flow topology was observe at 20° angle of incidence. Significant difference in flow field was observed at 24° between propeller-on and off condition. The induced slipstream from the propeller makes the flow well attached over the wing planform

Pressure measurement on NASA 0416 and NAL 7025 airfoils in the 1.5m wind tunnel

Experiments are being conducted in the 1.5m low speed wind tunnel to provide the required data for the design of the NAL Regional Transport Aircraft (RTA). In the first phase, pressure measurements have been conducted in the velocity range of 25-45 m/s and incidence angle range of -4 to 16 deg on the reference airfoil NASA 0416 and on the airfoil NAL 7025, designed for the RTA wing. The results show that our measurements compare well with those from NASA. The coefficients of pressure and lift show that the NAL 7025 airfoil has promise for being adapted for the RTA

Antioxidant Activity of Some Wild Mushrooms From Southern Western Ghats, India

Objective: To investigate the antioxidant activities of crude methanol extracts of 10 southern Western Ghats wild mushrooms. Methods: Crude methanol extracts from 10 mushrooms from southern Western Ghats, India were evaluated for their antioxidant activity by Nitric Oxide scavenging assay and DPPH scavenging assay. Results: The methanol extract of Trametes versicolor recorded maximum percentage of NO activity of 94% followed by Tricholoma equestre 92% at the concentration 50 µg/ml. However, the extract of Gymnopilus junonius (80.33%) and Tricholoma equestre (79%) tested against DPPH stable radicals reveals that the radical scavenging activity of wild mushrooms possessed excellent antioxidant capacity which increased with the increasing concentration of the extract. Conclusions: Gymnopilus junonius, Tricholoma equestre and Trametes versicolor have higher antioxidant activity showed both in Nitric Oxide scavenging assay and DPPH scavenging assay