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: Control theory & CMOS. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

Fixed Point Theorems and Generalizations of Dislocated Metric Spaces

Abstract: In this note we discuss some topological properties and generalizations of dislocated metric space and establish some fixed point theorems. Mathematics Subject Classification: 47H10, 54H25.

A Validated RP-HPLC Method for the Estimation of Lapatinib in Tablet Dosage form using Gemcitabine Hydrochloride as an Internal Standard

Abstract: A simple, selective, rapid, precise and economical reverse‑phase high‑performance liquid chromatography method has been developed for the determination of lapatinib in tablet using gemcitabine hydrochloride as an internal standard. Chromatography was carried out on an ODS C‑18 RP column (4.6 mm i.d. ×250 mm) using a mixture of acetonitrile and water (50:50 v/v) as the mobile phase at a flow rate of 1.0 ml/min. The drug was monitored at 232 nm. The retention times for lapatinib and gemcitabine hydrochloride were found to be 4.25±0.05 and 6.10±0.05 min, respectively. The method produced linear responses in the concentration range of 2‑60 μg/ml of lapatinib. The limit of detection and limit of quantitation were 0.265 and 0.884 μg/ml, respectively.

Performance Analysis of GFDM Modulation in Heterogeneous Network for 5G NR

Abstract: Network densification becomes inevitable due to rapidly increasing mobile data traffic in the evolution of future cellular networks. Therefore, Heterogeneous Wireless Networks eliminate the challenges that are not covered in 4G-Long Term Evolution. The extensive contribution of the proposed work is to develop a cluster based algorithm that establishes the maximum node connections in the heterogeneous wireless network and also to implement effective Multi-User Generalized Frequency Division Multiplexing in the physical layer for future wireless communications. The presence of unconnected nodes (Base Stations) in the wireless network reduces the network efficiency and coverage capacity. Whenever a wireless device is connected to at least one isolated neighbor node (BS), it acts as a Virtual Clustered Head based on shortest path node and residual energy of the node. A Virtual Cluster (VC) based multipath routing is implemented for Heterogeneous Networks to maximize the Energy Efficiency (EE), Spectral Efficiency (SE), Channel Capacity (CC), and Network Capacity (NC) and minimize the Bit Error Rate and latency under different constraints in the network. The simulation results with GFDM modulation shows the improvement in the network performance and compared with existing OFDM results.

Low voltage, high speed FinFET based 1-bit BBL-PT full adders

Abstract: Feature size of CMOS technology continues to scale down; new devices like FinFET are experimented and proposed as an alternative device due to its superior characteristics. In this paper we have presented low voltage, high speed 1-bit full adder cells in Branch Based Logic and Pass Transistor (BBL-PT) logic by using FinFET model parameters. In BBL-PT full adder lies a drawback i.e. voltage step existed in sum output. That could be eliminated in the proposed logics by using the diode connected FinFET (D-FinFET) inverter, N-type FinFET inverter and modified current sink restorer structures. Proposed full adder circuits are compared with conventional adder circuits, and proposed circuits have demonstrated the good delay performance. The performance of proposed and other conventional full adder circuits are examined using Cadence and the model parameters of 180 nm CMOS technology with +1.2 V supply rail voltage and 20 nm FinFET model files with +0.6 V supply rail voltage with frequency 100 MHz.

Visible Light Photocatalytic Activity of Pt/N‐TiO2 towards Enhanced H2 Production from Water Splitting

Abstract: Present work mainly focuses on experimental investigation to improvement of hydrogen production by water photoelectrolysis. An experimental facility was designed and constructed for visible light photocatalysis. A series of N-TiO2 photocatalysts impregnated with platinum on the surface of N-TiO2 were prepared. Hydrogen production upon irradiating aqueous Pt/N-TiO2 suspension with visible light was investigated. The shift in excitation wavelength of TiO2 was 380 nm improved the yield of hydrogen production by N-TiO2 and Pt/N-TiO2. We used a 400 W mercury arc lamp combined with a 400 nm cutoff filter eliminating all the wavelengths under 400 nm. Pt/N-TiO2 material was characterized with TPR, reflective UV/Visible spectroscopy and TEM. The best hydrogen production rate obtained for this setup for N/Ti = 10, 0.05 wt% Pt/N-TiO2, through water splitting was about 772 μmolh−1g−1.