Vignan University

About: Vignan University is a education organization based out in Guntur, Andhra Pradesh, India. It is known for research contribution in the topics: Computer science & Control theory. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

A new low-power full-adder cell for low voltage using CNTFETs

Abstract: One of the most crucial components in the computing devices is the full adders. The efficiency and effectiveness of arrays of full adders is essential; thus making it sensible to put in a reasonable effort towards improvisation of computational devices. In this paper, a new 1-BIT Full Adder (FA) with a combination of pass transistor logic and transmission gate logic is suggested. This new hybrid adder is having only 18 transistors. The proposed full adder is a CNTFET based design and also implemented 8-BIT Ripple carry Adder (RCA) at 32 nm CNTFET model files using the Cadence virtuoso tool.

A Spectroscopy and Microscopy Study of Parylene-C OFETs for Explosive Sensing

Abstract: In this paper, we have explored Parylene-C (PC) as a sensing material for its unique signature and selectivity for explosive sensing. We have used a bi-layer deposition process to fabricate bottom-gate-top-contact organic field effect transistor (OFET) structures. Opening of dangling bonds on subjecting PC to plasma oxidation (POPC) renders these molecules to be employed as a receptor material in sensing vapors of both explosives and non-explosives, such as Trinitrotoulene (TNT), 1,3,5 trinitro-1,3,5-triazacyclohexane(RDX), PETN, Dinitrobenzene (DNB), Nitrobenzene (NB), Benzoquinone (BQ), and Benzophenone (BP). The change in: 1) the vibrational modes of the molecule by infrared spectroscopy; 2) surface potential of POPC by Kelvin probe force microscopy (KPFM); and 3) electrical characterization by I-V measurements of PC-based OFET on exposing to vapors have been systematically studied. Different signatures for all the analytes have been observed while exact and perfect selectivity for TNT, RDX were found from I-V studies and for PETN by KPFM studies. Thus, the OFET device-based chemical sensors demonstrated here with improved sensitivity and excellent selectivity, stand as promising candidates for explosives detection.

Effects of Newtonian heating on the boundary layer flow of non-Newtonian magnetohydrodynamic nanofluid over a stretched plate using spectral relaxation method

Abstract: The boundary layer flow of a steady, two-dimensional, incompressible non-Newtonian nanofluid is studied in this analysis over a stretched sheet with an external uniform magnetic field. To analyse t...

Enhancing nitrogen removal efficiency of domestic wastewater through increased total efficiency in sewage treatment (ITEST) pilot plant in cold climatic regions of Baltic Sea

Abstract: The temperatures of sewage water were too low in cold climatic regions of Baltic Sea, which resulted in inefficiency of denitrification in sewage treatment process (STP). This is not prescribed to meet the effluent nitrogen levels (