Cochin University of Science and Technology

About: Cochin University of Science and Technology is a education organization based out in Kochi, Kerala, India. It is known for research contribution in the topics: Thin film & Natural rubber. The organization has 5382 authors who have published 7690 publications receiving 103827 citations. The organization is also known as: CUSAT & Cochin University.

A note on energy of some graphs

Abstract: Eigenvalue of a graph is the eigenvalue of its adjacency matrix. The energy E(G) of a graph G is the sum of the absolute values of its eigenvalues. In this paper we obtain analytic expressions for the energy of two classes of regular graphs.

Phase transitions and geometrothermodynamics of regular black holes

Abstract: In this paper we study the thermodynamics and state space geometry of a set of regular black hole solutions such as Bardeen black hole (1968), Ayon-Beato and Garcia black hole (Phys Rev Lett 80:5056, 1998), Hayward black hole (Phys Rev Lett 96:031103, 2006) and Berej–Matyjasek–Trynieki–Wornowicz black hole (Gen Relativ Gravit 38(5):885906, 2006). We find that all these black holes show second order thermodynamic phase transitions by observing discontinuities in heat capacity–entropy graphs as well as the cusp type double point in free energy–temperature graph. Using the formulation of geometrothermodynamics we again find the singularities in the heat capacity of the black holes by calculating the curvature scalar of the Legendre invariant metric.

Synthesis of Bio-Compatible SPION–based Aqueous Ferrofluids and Evaluation of RadioFrequency Power Loss for Magnetic Hyperthermia

Abstract: Bio-compatible magnetic fluids having high saturation magnetization find immense applications in various biomedical fields. Aqueous ferrofluids of superparamagnetic iron oxide nanoparticles with narrow size distribution, high shelf life and good stability is realized by controlled chemical co-precipitation process. The crystal structure is verified by X-ray diffraction technique. Particle sizes are evaluated by employing Transmission electron microscopy. Room temperature and low-temperature magnetic measurements were carried out with Superconducting Quantum Interference Device. The fluid exhibits good magnetic response even at very high dilution (6.28 mg/cc). This is an advantage for biomedical applications, since only a small amount of iron is to be metabolised by body organs. Magnetic field induced transmission measurements carried out at photon energy of diode laser (670 nm) exhibited excellent linear dichroism. Based on the structural and magnetic measurements, the power loss for the magnetic nanoparticles under study is evaluated over a range of radiofrequencies.