Gandhi Institute of Technology and Management

About: Gandhi Institute of Technology and Management is a education organization based out in Visakhapatnam, Andhra Pradesh, India. It is known for research contribution in the topics: Computer science & Heat transfer. The organization has 3392 authors who have published 4043 publications receiving 29139 citations. The organization is also known as: GITAM & GITAM College.

Colossal dielectric permittivity in Co-doped ZnO ceramics prepared by a pressure-less sintering method.

Abstract: Dielectric properties and impedance spectroscopic studies of single phase Zn1− xCoxO (0 ≤ x ≤ 0.05) ceramics, synthesized by a pressure-less solid state reaction method, have been carried out to investigate the origin of colossal dielectric permittivity (CP), e′ ∼ 105, in a wide frequency (2 × 101–2 × 106 Hz) range. These results show that a defect density within the grain is present in the materials due to the use of pressure-less sintering at high temperature for a long duration of time. The colossal dielectric response is essentially due to this electronic inhomogeneous conduction mechanism within the material due to the production of absorption current in the thin grain boundary region which accumulates charge at the interface and induces Maxwell–Wagner interfacial polarization. Moreover, this defect structure further increases with the addition of Co ions and enhances the CP property. An effective way to control the colossal dielectric properties is to control the defect density within a grain by using a proper sintering method.

Third Hankel determinant for starlike and convex functions with respect to symmetric points

Abstract: The objective of this paper is to obtain best possible upper bound to the \(H_{3}(1)\) Hankel determinant for starlike and convex functions with respect to symmetric points, using Toeplitz determinants.