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.

Coupled fixed point theorems with rational expressions in partially ordered metric spaces

Abstract: The purpose of this paper is to establish some coupled fixed point theorems using a contractive condition of rational type with monotone property in the frame work of partially ordered metric space. The existence and uniqueness of the result is also presented for the coupled fixed point to the mappings. The result presented over here generalize and extend several well-know results in the literature.

A computational investigation of the influence of acceptor moieties on photovoltaic performances and adsorption onto the TiO2 surface in triphenylamine-based dyes for DSSC application

Abstract: Five metal-free organic dyes (A1 to A5) comprising triphenylamine and vinyl-thiophene as a common donor and spacer, respectively were considered in this work. The different acceptors, such as 2-cyanoacetic acid, 2-methylenemalononitrile, rhodanine-3-acetic acid, benzoic acid, and pyridine were chosen to investigate their accepting ability, photovoltaic performances, and adsorption onto the TiO2 surface. Density functional theory (DFT) and time-dependent DFT were employed to study their photophysical and photoelectrochemical properties. The ground state energies were calculated to evaluate the dye regeneration driving force ( E I 3 - / I - - E H O M O ). The excited-state calculation provided the information about the intramolecular charge transfer (ICT) and excited-state properties. Projected density of state and natural bond orbital (NBO) analyses were carried out to further understand the ICT between triphenylamine donor and the acceptor moiety. The density of states of the dye@TiO2 revealed the smooth electron transfer at the dye/TiO2 interface devoid of defect state. Higher ( E I 3 - / I - - E H O M O ), highest negative NBO charge on the acceptor, lower reorganization energy, and higher negative adsorption energy onto the surface of the TiO2 would make the dye A1 as the best performer in DSSC. The computed data are in good agreement with the experimental observation.

Designing energy efficient logic gates with Hetero junction Tunnel fets at 20nm

Abstract: This paper presents the design insights and benchmarking of 20nm Hetero-junction Tunnel transistor (HTFET) as steep slope device for designing energy efficient logic gates. 20nm Si FinFET technology has been used for benchmarking HTFET circuit performance. The HTFET logic topologies have improved robustness and energy efficiency over Si FinFET topology, particularly for small supply voltages. This work further explores the analysis of HTFET based cascaded chain of inverters to drive a large capacitive load. It has been demonstrated that HTFET based circuit design opens path for energy efficient logic design not achievable with CMOS technology at small supply voltages.

Characteristics and Functions of the Yip1 Domain Family (YIPF), Multi-Span Transmembrane Proteins Mainly Localized to the Golgi Apparatus.

Abstract: Yip1 domain family (YIPF) proteins are multi-span, transmembrane proteins mainly localized in the Golgi apparatus. YIPF proteins have been found in virtually all eukaryotes, suggesting that they have essential function(s). Saccharomyces cerevisiae contains four YIPFs: Yip1p, Yif1p, Yip4p, and Yip5p. Early analyses in S. cerevisiae indicated that Yip1p and Yif1p bind to each other and play a role in budding of transport vesicles and/or fusion of vesicles to target membranes. However, the molecular basis of their functions remains unclear. Analysis of YIPF proteins in mammalian cells has yielded significant clues about the function of these proteins. Human cells have nine family members that appear to have overlapping functions. These YIPF proteins are divided into two sub-families: YIPFα/Yip1p and YIPFβ/Yif1p. A YIPFα molecule forms a complex with a specific partner YIPFβ molecule. In the most broadly hypothesized scenario, a basic tetramer complex is formed from two molecules of each partner YIPF protein, and this tetramer forms a higher order oligomer. Three distinct YIPF protein complexes are formed from pairs of YIPFα and YIPFβ proteins. These are differently localized in either the early, middle, or late compartments of the Golgi apparatus and are recycled between adjacent compartments. Because a YIPF protein is predicted to have five transmembrane segments, a YIPF tetramer complex is predicted to have 20 transmembrane segments. This high number of transmembrane segments suggests that YIPF complexes function as channels, transporters, or transmembrane receptors. Here, the evidence from functional studies of YIPF proteins obtained during the last two decades is summarized and discussed.

Acclimation potential of Noni (Morinda citrifolia L.) plant to temperature stress is mediated through photosynthetic electron transport rate.

Abstract: Noni (Morindacitrifolia L.), a tropical, medicinal plant of the family Rubiaceae utilized since 2000 y ago by the Polynesians, is currently facing a major challenge in production vis-a-vis climate ...