30 Matching Results

Search Results

Advanced search parameters have been applied.

A New Perspective on the Afterlife Issue

Description: Article exploring the claim that human beings survive death as conscious entities, suggesting that a recording may persist of some aspects of one's life, of which some people may become aware under certain circumstances. The author examines whether this interpretation of phenomena believed oto be afterlife-related is plausible in terms of current scientific knowledge.
Date: Autumn 2003
Creator: Krishnan, V.
Partner: UNT Libraries

Near-Death Experiences: Evidence for Survival?

Description: Abstract: "This paper argues that the out-of-body experience (OBE) and other elements of a near-death experience (NDE), as well as the positive affects that accompany them, do not yeild conclusive evidence for survival after death. The OBE has features that suggest a physical basis for it, the other elements show the influence of cultural background, and positive affects may simply occur to conserve one's energy and prolong life. Other explanations for near-death elements, such as sensory deprivation, extrasensory perception, and eyeless sight, are addressed."
Date: Spring 1985
Creator: Krishnan, V.
Partner: UNT Libraries

Singlet Quenching of Tetraphenylporphyrin and its Metal Derivatives by Iron(III) Coordination Compounds

Description: This article reports on the singlet quenching of 5, 10, 15, 20-tetraphenylporphyrin (Hâ‚‚TPP) and its magnesium(II) and zinc(II) derivatives (MgTPP and ZnTPP) by a series of iron(III) coordination compounds bearing different ligand systems.
Date: January 6, 1990
Creator: D'Souza, Francis & Krishnan, V.
Partner: UNT College of Arts and Sciences

Temperature dependence of protein hydration hydrodynamics by molecular dynamics simulations.

Description: The dynamics of water molecules near the protein surface are different from those of bulk water and influence the structure and dynamics of the protein itself. To elucidate the temperature dependence hydration dynamics of water molecules, we present results from the molecular dynamic simulation of the water molecules surrounding two proteins (Carboxypeptidase inhibitor and Ovomucoid) at seven different temperatures (T=273 to 303 K, in increments of 5 K). Translational diffusion coefficients of the surface water and bulk water molecules were estimated from 2 ns molecular dynamics simulation trajectories. Temperature dependence of the estimated bulk water diffusion closely reflects the experimental values, while hydration water diffusion is retarded significantly due to the protein. Protein surface induced scaling of translational dynamics of the hydration waters is uniform over the temperature range studied, suggesting the importance protein-water interactions.
Date: July 18, 2007
Creator: Lau, E Y & Krishnan, V V
Partner: UNT Libraries Government Documents Department

New Approaches to Quantum Computing using Nuclear Magnetic Resonance Spectroscopy

Description: The power of a quantum computer (QC) relies on the fundamental concept of the superposition in quantum mechanics and thus allowing an inherent large-scale parallelization of computation. In a QC, binary information embodied in a quantum system, such as spin degrees of freedom of a spin-1/2 particle forms the qubits (quantum mechanical bits), over which appropriate logical gates perform the computation. In classical computers, the basic unit of information is the bit, which can take a value of either 0 or 1. Bits are connected together by logic gates to form logic circuits to implement complex logical operations. The expansion of modern computers has been driven by the developments of faster, smaller and cheaper logic gates. As the size of the logic gates become smaller toward the level of atomic dimensions, the performance of such a system is no longer considered classical but is rather governed by quantum mechanics. Quantum computers offer the potentially superior prospect of solving computational problems that are intractable to classical computers such as efficient database searches and cryptography. A variety of algorithms have been developed recently, most notably Shor's algorithm for factorizing long numbers into prime factors in polynomial time and Grover's quantum search algorithm. The algorithms that were of only theoretical interest as recently, until several methods were proposed to build an experimental QC. These methods include, trapped ions, cavity-QED, coupled quantum dots, Josephson junctions, spin resonance transistors, linear optics and nuclear magnetic resonance. Nuclear magnetic resonance (NMR) is uniquely capable of constructing small QCs and several algorithms have been implemented successfully. NMR-QC differs from other implementations in one important way that it is not a single QC, but a statistical ensemble of them. Thus, quantum computing based on NMR is considered as ensemble quantum computing. In NMR quantum computing, the spins with non-zero ...
Date: February 7, 2003
Creator: Colvin, M & Krishnan, V V
Partner: UNT Libraries Government Documents Department