128 research outputs found
2-Domination Polynomial of Tensor Product of Paths
We have calculated the 2-domination number of the tensor product of P2 and Pn. We have derived the distance-2 domination polynomials of tensor product of P2 and Pn
A multi-orbital iterated perturbation theory for model Hamiltonians and real material-specific calculations of correlated systems
Perturbative schemes utilizing a spectral moment expansion are well known and
extensively used for investigating the physics of model Hamiltonians and real
material systems. The advantages they offer, in terms of being computationally
inexpensive, with real frequency output at zero and finite temperatures,
compensate for their deficiencies and offer a quick, qualitative analysis of
the system behavior. In this work, we have developed a method, that can be
classified as a multi-orbital iterative perturbation theory (MO-IPT) to study
N-fold degenerate and non degenerate Anderson impurity models. As applications
of the solver, we have combined the method with dynamical mean field theory to
explore lattice models like the single orbital Hubbard model, covalent band
insulator and the multi-orbital Hubbard model for density-density type
interactions in different parameter regimes. The Hund's coupling effects in
case of multiple orbitals is also studied. The limitations and quality of
results are gauged through extensive comparison with data from the numerically
exact continuous time quantum Monte Carlo method (hybridization expansion
CTQMC). In general we observe that the agreement with CTQMC results gets better
as we move away from particle-hole symmetry. We have integrated MO-IPT with
density functional theory based electronic structure methods to study real
material systems. As a test case, we have studied the classic, strongly
correlated electronic material, SrVO. A comparison of density of states and
photo emission spectrum (PES) with results obtained from different impurity
solvers and experiments yields good agreement.Comment: 20 pages, 20 figure
The KaVA and KVN Pulsar Project
We present our work towards using the Korean VLBI (Very Long Baseline
Interferometer) Network (KVN) and VLBI Exploration of Radio Astronomy (VERA)
arrays combined into the KVN and VERA Array (KaVA) for observations of radio
pulsars at high frequencies (22-GHz). Pulsar astronomy is generally
focused at frequencies approximately 0.3 to several GHz and pulsars are usually
discovered and monitored with large, single-dish, radio telescopes. For most
pulsars, reduced radio flux is expected at high frequencies due to their steep
spectrum, but there are exceptions where high frequency observations can be
useful. Moreover, some pulsars are observable at high frequencies only, such as
those close to the Galactic Center. The discoveries of a radio-bright magnetar
and a few dozen extended Chandra sources within 15 arc-minute of the Galactic
Center provide strong motivations to make use of the KaVA frequency band for
searching pulsars in this region. Here, we describe the science targets and
report progresses made from the KVN test observations for known pulsars. We
then discuss why KaVA pulsar observations are compelling.Comment: To appear in PASJ KaVA Special Issu
Relationship of serum adiponectin and resistin to glucose intolerance and fat topography in south-Asians
Objectives
South-Asians have lower adiponectin levels compared to Caucasians. It was not clear however, if this intrinsic feature is related to aspects of glucose metabolism. This study aims to determine the relationship between body fat distribution and adipocytokine in South-Asian subjects by measuring serum adipocytokines, adiposity, insulinemia, and glucose tolerance levels.
Methods
In this cross-sectional study, 150 South-Asians (80 males, 70 females) were included, 60 had NGT (Control group, Age 51.33 ± 11.5, BMI 27 ± 2.3), 60 had IGT (Age 57.7 ± 12.5, BMI 27.2 ± 2.7), 30 had type 2 DM (Age 49.5 ± 10.9, BMI 28 ± 1.7). Measures of adiposity, adipocytokines and other metabolic parameters were determined. Parameters were measured using the following: a) Plasma glucose by glucose oxidase method b) CRP by immunoturbidimetric method (Roche/Hitachi analyser) c) insulin by Medgenix INS-ELISA immunoenzymetric assay by Biosource (Belgium) d) Leptin, Adiponectin by radioimmunoassay kits by Linco Research (St. Charles MO) e) Resistin by immunoassay kits by Phoenix Pharmaceuticals INC (530 Harbor Boulevard, Belmont CA 94002, USA).
Results
Adiponectin concentrations were highest in NGT, decreased in IGT and lowest in DMT2, (both p < 0.01). Leptin was significantly higher in DMT2 than IGT and NGT p = 0.02 and 0.04 respectively. There was a significant positive relationships between log adiponectin and 2-hr insulin values, p = 0.028 and history of hypertensions and a ischemic heart disease p = 0.008 with R = 0.65. There was a significant inverse correlation between log adiponectin and resistin, p < 0.01.
Conclusion
Resistin levels had an inverse correlation with adiponectin levels, indicating an inverse relationship between pro-inflammatory cytokines and adiponectin. Adiponectin levels were related to glucose tolerance
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