Tunneling Carbon Nanotube Field Effect Transistor with Asymmetric Graded Double Halo Doping in Channel: Asym-GDH-T-CNTFET

AbstractA tunneling carbon nanotube field effect transistor with asymmetric graded double halo (asym-GDH-T-CNTFET) is investigated in order to enhance band to band tunneling and evaluate the device characteristics by non-equilibrium Green's function (NEGF) method. The asym-GDH-T-CNTFET structure includes in n-doped halo at the source side and p-doped halo at the drain side which covered through the channel. The source-side halo doping, reduces short-channel effect (SCE) and drain induced barrier lowering (DIBL) and the drain-side halo doping reduces drain energy barrier and increases band to band tunnelling in drain contact, subsequently. The asym-GDH-T-CNTFET has represented a higher tunneling current compared to T-CNTFET. Sub-threshold swing increases and ON/OFF current ratio decreases using of asymmetric graded double halo tunnelling carbon nanotube field effect transistor when compared to that of tunnelling carbon nanotube field effect transistor (T-CNTFET). In this paper, we investigate on-state current, tunneling-current and also characteristics of the asym-GDH-T-CNTFET compares to T-CNTFET

State estimation in linear dynamical systems by partial update Kalman filtering

In this letter, we develop a partial update Kalman filtering (PUKF) algorithm to solve the state of a discrete-time linear stochastic dynamical system. In the proposed algorithm, only a subset of the state vector is updated at every iteration, which reduces its computational complexity, compared to the original KF algorithm. The required conditions for the stability of the algorithm are discussed. A closed-form expression for steady-state mean-square deviation is also derived. Numerical examples are used to validate the correctness of the provided analysis. They also reveal the PUKF algorithm exhibits a trade-off between the estimation accuracy and the computational load which is extremely profitable in practical applications

Removal of Pb ion from water samples using red mud (bauxite ore processing waste)

This work presented the use of red mud (bauxite ore processing waste) in removal of lead ions in water samples. For this 0.1 g of red mud has been used as adsorbent which suspended in 10 ml of lead solution with the concentration of 50 mg l-1 for about 1 h. After that the lead concentration in the samples taken from the red mud treated lead solution measured with atomic absorption spectroscopy (AAS). The effect of some parameter which is important in adsorption of lead on red mud such as suitable adsorbent dosage, pH and contact time of solution and adsorbent was investigated. The result shows that red mud as solid waste and low-cost adsorbent can be successfully used for the removal of lead ion from aqueous solution