Exact spin-orbital separation in a solvable model in one dimension

A one-dimensional model of coupled spin-1/2 spins and pseudospin-1/2 orbitals with nearest-neighbor interaction is rigorously shown to exhibit spin-orbital separation by means of a non-local unitary transformation. On an open chain, this transformation completely decouples the spins from the orbitals in such a way that the spins become paramagnetic while the orbitals form the soluble XXZ Heisenberg model. The nature of various correlations is discussed. The more general cases, which allow spin-orbital separation by the same method, are pointed out. A generalization for the orbital pseudospin greater than 1/2 is also discussed. Some qualitative connections are drawn with the recently observed spin-orbital separation in Sr2CuO3.Comment: 5 page

Experimental evaluation of anti-hyperglycemic and hypolipidemic effects of stevia rebaudiana, Anacardium occidentale on wistar rats

Background: Diabetes mellitus, obesity, hypertension, hyperlipidaemia etc. is one of the pandemic metabolic disorder in the world, may lead to obesity, hypertension, hyperlipidaemia etc. Despite of medical advances like oral hypoglycemic agents, insulin pump, xenotransplantation and all don't provide enough control of blood sugar level to control Diabetes and its complications. Hence it is the right time for work on a new medicine, which can successfully control the blood sugar and bodily lipids and cost effective one also. In the present study an attempt is made to check the efficacy of folklore drugs with a conventional anti-diabetic compound glibenclamide.Methods: The decoction of a drugs Stevia rebaudiana and Anacardium occidentale prepared as described in The Ayurvedic Formulary of India, wistar rats of either sex were selected randomly. Before and after values of blood glucose, triglyceride, high density lipid and total cholesterol level were taken.Results: On analyzing the results, the study showed that the trial drug II stevia is effective and trial drug I Kajutaka is slightly effective in reducing the glucose level next to glibenclamide. The trial drug I Kajutaka showed effective in reducing the Triglyceride level followed by Stevia. The action may be due to alkaloids such as Stevioside, Rebaudioside possessed by Stevia, which may stimulate the islets of the pancreas to release Insulin. The Hypolipedimic action may be due to presence of Chemical constituents in Kajutaka leaf such as Ascorbic acid and Niacin.Conclusions: The present experimental study is preliminary one elaborate study with larger sample size is required to come up with a more significant result

Non Inverted Isothermal Equation of state for NaCl-CsCl type Crystals

The Pressure-Volume-temperature(P-V-T) relation using non inverted equation of state (EOS) viz. Murnaghan EOS, Usual-Tait EOS, Vinet EOS, Born-Mayer EOS, Birch EOS, Kumar EOS, Shanker EOS, Brennan Stacey EOS, Poirier- Tarantola EOS, Universal EOS and Freund & Ingalls EOS for NaCl-CsCl type crystals has been studied. It is found that except Murnaghan EOS, Brennan-Stacey EOS and Poirier Tarantola EOS all other EOS gives close agreement with each other even at high compression ranges. Also another remarkable characteristic observed when the value of compression decreases from 0.5 the variation in value of pressure as calculated by different EOS increases

X-ray emission from O-type stars : DH Cep and HD 97434

We present X-ray emission characteristics of the massive O-type stars DH Cep and HD 97434 using archival XMM-Newton observations. There is no convincing evidence for short term variability in the X-ray intensity during the observations. However, the analysis of their spectra reveals X-ray structure being consistent with two-temperature plasma model. The hydrogen column densities derived from X-ray spectra of DH Cep and HD 97434 are in agreement with the reddening measurements for their corresponding host clusters NGC 7380 and Trumpler 18, indicating that the absorption by stellar wind is negligible. The X-ray emission from these hot stars is interpreted in terms of the standard instability-driven wind shock model.Comment: 13 pages ; 2 figures; 2 tables (Accepted for publication in New Astronomy