Girijavallabhan, C P; Radhakrishnan, P; V P N Nampoori; Geetha, K; Rajesh, M(Journal of Optics A: Pure and Applied Optics, Institute of Physics Publishing, January 13, 2006)
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Abstract:
We present a compact solid-state laser based on leaky mode propagation
from a dye-doped polymer free-standing film waveguide. The edge emitted
spectrum clearly indicated the existence of periodic resonant modes. The
reflections from the lateral faces of the free-standing film provided the
optical feedback thus giving rise to a Fabry–Perot like optical cavity. This
together with the guidance through the gain medium gave rise to intense
narrow emission lines. For a pump energy of 1.82 mJ/pulse, an intense line
with FWHM ∼0.4 nmwas observed at 576.5 nm.
Aparna,Lakshmanan S; Vijayakumar,Ambat(Department of Mathematics, 2000)
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Abstract:
In this paper, we study the domination number, the global dom
ination number, the cographic domination number, the global co
graphic domination number and the independent domination number
of all the graph products which are non-complete extended p-sums
(NEPS) of two graphs.
David Peter,S; Paulose Jacob,K(Cochin University of Science and Technology, August , 2006)
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Abstract:
The present study shows design and development of a performance evaluation prototype for IT organizations in the context of outsourcing. The main objective of this research is to help an IT organization in the context of outsourcing to realize its current standing, so it can take corrective steps where ever necessary and strive for continuous improvement. Service level management (SLM) process plays a crucial role in controlling the quality provision for IT service. Out sourcing is the process of entrusting the responsibility of providing certain goods and services to an external party. We have tried to identify as many as twenty complexities and categorized in to four headings. Complexities associated with contracts and SLAs,SLM process,SLM organization and complexities due to intrinsic characteristics. In this study it is possible to measure the quality of the performance of an IT organization in an outsourcing environment effectively
Indulal,G; Vijayakumar,A(Department of Mathematics, 2008)
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Abstract:
Eigenvalue of a graph is the eigenvalue of its adjacency matrix. The energy of a graph is the
sum of the absolute values of its eigenvalues. In this note we obtain analytic expressions for the
energy of two classes of regular graphs.
Beyer,G J; Hagebo,E; Novgorodov,A F; Ravn,H L(EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH, November 7, 2002)
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Abstract:
On line isotope separation techniques (ISOL) for production of ion beams of short-lived radionuclides
require fast separation of nuclear reaction products from irradiated target materials followed by a transfer into
an ion source. As a first step in this transport chain the release of nuclear reaction products from refractory
metals has been studied systematically and will be reviewed. High-energy protons (500 - 1000 MeV) produce
a large number of radionuclides in irradiated materials via the nuclear reactions spallation, fission and
fragmentation. Foils and powders of Re, W, Ta, Hf, Mo, Nb, Zr, Y, Ti and C were irradiated with protons
(600 - 1000 MeV) at the Dubna synchrocyclotron, the CERN synchrocyclotron and at the CERN PS-booster
to produce different nuclear reaction products.
The main topic of the paper is the determination of diffusion coefficients of the nuclear reaction products
in the target matrix, data evaluation and a systematic interpretation of the data. The influence of the ionic
radius of the diffusing species and the lattice type of the host material used as matrix or target on the
diffusion will be evaluated from these systematics. Special attention was directed to the release of group I, II
and III-elements. Arrhenius plots lead to activation energies of the diffusion process.
Renuka, T R; Ani Das, V; Paulose, C S(Department of Biotechnology, March 2, 2004)
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Abstract:
Muscarinic M1 and M3 receptor changes in the brain stem during pancreatic regeneration were investigated.
Brain stem acetylcholine esterase activity decreased at the time of regeneration . Sympathetic activity also
decreased as indicated by the norepinephrine (NE) and epinephrine (EPI) content of adrenals and also in the
plasma. Muscarinic Ml and M3 receptors showed reciprocal changes in the brain stem during regeneration.
Muscairnic M1 receptor number decreased at time of regeneration without any change in the affinity. High affinity
M3 receptors showed an increase in the number. The affinity did not show any change . The number of low affinity
receptors decreased with decreased Kd at 72 hours after partial pancreatectomy. The Kd reversed to control value
with a reversal of the number of receptors to near control value . Gene expression studies also showed a similar
change in the mRNA level of Ml and M3 receptors . These alterations in the muscarinic receptors regulate
sympathetic activity and maintain glucose level during pancreatic regeneration. Central muscarinic M1 and M3
receptor subtypes functional balance is suggested to regulate sympathetic and parasympathetic activity, which in
turn control the islet cell proliferation and glucose homeostasis.
Paulose,C S; Amee,Krishnakumar; Anu,Joseph(Department of Biotechnology, October 25, 2006)
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Abstract:
The recent developments in neurobiology have rendered new prominence
and potential to study about the structure and function of brain and related disorders.
Human behaviour is the net result of neural control of the communication between
brain cells. Neurotransmitters are chemicals that are used to relay, amplify and
modulate electrical signals between neurons and/or another cell. It mediates rapid
intercellular communication through the nervous system by interacting with cell
surface receptors. These receptors often trigger second messenger signaling pathways
that regulate the activity of ion channels. The functional balance of different
neurotransmitters such as Acetylcholine (Ach), Dopamine (DA), Serotonin (5-HT),
Norepinephrine (NE), Epinephrine (EPI), Glutamate and Gamma amino butyric acid
(GABA) regulates the growth, division and other vital functions of a normal cell /
organism (Sudha, 1998). Any change in neurotransmitters' functional balance will
result in the failure of cell function and may lead to the occurrence of diseases.
Abnormalities in the production or functioning of neurotransmitters have been
implicated in a number of neurological disorders like Schizophrenia, Alzheimer's,
Epilepsy, Depression and Parkinson's disease. Changes in central and peripheral
neuronal signaling system is also noted in diabetes, cancer, cell proliferation,
alcoholism and aging. Elucidation of neurotransmitters receptor interaction pathways
and gene expression regulation by second messengers and transcriptional factors
in health and disease conditions can lead to new small molecules for development
of therapeutic agents to improve neurological disease conditions. Increased
awareness of the global effects of neurological disorders should help health care
planners and the neurological community set appropriate priorities in research,
prevention, and management of these diseases.