An Improved Algorithm of the Node Localization in Ad Hoc Network

Abstract—If the destination node is far from the source node, the transmission of the routing control information for the destination node has some delay and will then affect the accuracy of the node localization. An algorithm is proposed to predict the actual location of the destination node based on its current position information in routing table. The original algorithm is analyzed, and the primary reason that the node localization has some deficiency is pointed out. The node localization forecast algorithm is designed and realized, and the forecast algorithm is used to improve the accuracy of the node localization as far as possible. The algorithm is simulated and analyzed, and it proved that the proposed algorithm can effectively reduce the impact of positioning accuracy caused by the node transmission delay and other factors

Catalytic determination of ultra trace amounts of titanium by 2.5 – order differential oscillopolarography

541-544Ti(IV) has a very strong catalytic effect on the slow reaction of iodate-iodide-brilliant green (BG) in diluted sulphuric acid medium at 100oC. Brilliant green exhibits a sensitive 2.5 order differential oscillopolarographic wave at -0.45V(vs.SCE.). The influence of excess IO-3 on the polarographic measurements of Brilliant green can be eliminated by addition of ascorbic acid. This provides the basis for a novel and highly sensitive and selective catalytic kinetic method with 2.5 order differential oscillopolarographic detection of titanium. The effects of sulphuric acid, potassium iodate, potassium iodide and Brilliant green concentrations, reaction temperature and reaction time have been investigated. A calibration curve of titanium in the range 0.1 to 10.0 ng ml-1 has been obtained by the fixed-time procedure. The detection limit is found to be 0.03 ng ml-1.The new method has been applied for the determination of trace amounts of Ti in hair samples with satisfactory results