1,801 research outputs found
Coal desulfurization process
A method for chlorinolysis of coal is an organic solvent at a moderate temperautre and atmospheric pressure has been proven to be effective in removing sulfur, particularly the organic sulfur, from coal. Chlorine gas is bubbled through a slurry of moist coal in chlorinated solvent. The chlorinated coal is separated, hydrolyzed and the dechlorinated. Preliminary results of treating a high sulfutr (4.77%S) bituminous coal show that up to 70% organic sulfur, 90% hyritic sulfur and 76% total sulfur can be removed. The treated coal is dechlorinated by heating at 500 C. The presence of moisture helps to remove organic sulfur
Universal scaling of the order-parameter distribution in strongly disordered superconductors
We investigate theoretically and experimentally the statistical properties of
the inhomogeneous order-parameter distribution (OPD) at the verge of the
superconductor-insulator transition (SIT). We find within two prototype
fermionic and bosonic models for disordered superconductors that one can
identify a universal rescaling of the OPD. By performing scanning-tunneling
microscopy experiments in three samples of NbN with increasing disorder we show
that such a rescaling describes also with an excellent accuracy the
experimental data. These results can provide a breakthrough in our
understanding of the SIT.Comment: 11 pages, 8 figures, revised version submitted to PR
A socio-medical study of morphological changes in endocervix with the use of oral contraceptives
The present study was conducted among the oral contraceptive users to see any impact of their socialfactors on the morphological changes in the en- docervix. These changes were seen more prominantly in the advancing age, low socio-economic group multiparous and having their marital life more than 5 years period. The oral contraceptives were taken by 53.33 percent ofwomen for 7-18 months duration. The prevalence and severity of the morÂphological change increased significantly with the increase in duration 'of use of contraceptives. However no relationship was observed with the religion and nativity of the users as well as the types of oral contraceptives used.
 
High spin polarization and the origin of unique ferromagnetic ground state in CuFeSb
CuFeSb is isostructural to the ferro-pnictide and chalcogenide
superconductors and it is one of the few materials in the family that are known
to stabilize in a ferromagnetic ground state. Majority of the members of this
family are either superconductors or antiferromagnets. Therefore, CuFeSb may be
used as an ideal source of spin polarized current in spin-transport devices
involving pnictide and the chalcogenide superconductors. However, for that the
Fermi surface of CuFeSb needs to be sufficiently spin polarized. In this paper
we report direct measurement of transport spin polarization in CuFeSb by
spin-resolved Andreev reflection spectroscopy. From a number of measurements
using multiple superconducting tips we found that the intrinsic transport spin
polarization in CuFeSb is high ( 47\%). In order to understand the unique
ground state of CuFeSb and the origin of large spin polarization at the Fermi
level, we have evaluated the spin-polarized band structure of CuFeSb through
first principles calculations. Apart from supporting the observed 47\%
transport spin polarization, such calculations also indicate that the Sb-Fe-Sb
angles and the height of Sb from the Fe plane is strikingly different for
CuFeSb than the equivalent parameters in other members of the same family
thereby explaining the origin of the unique ground state of CuFeSb.Comment: 6 pages, 4 figure
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