Large negative magnetoresistance in a ferromagnetic shape memory alloy : Ni_{2+x}Mn_{1-x}Ga

5% negative magnetoresistance (MR) at room temperature has been observed in bulk Ni_{2+x}Mn_{1-x}Ga. This indicates the possibility of using Ni_{2+x}Mn_{1-x}Ga as magnetic sensors. We have measured MR in the ferromagnetic state for different compositions (x=0-0.2) in the austenitic, pre-martensitic and martensitic phases. MR is found to increase with x. While MR for x=0 varies almost linearly in the austenitic and pre-martensitic phases, in the martensitic phase it shows a cusp-like shape. This has been explained by the changes in twin and domain structures in the martensitic phase. In the austenitic phase, which does not have twin structure, MR agrees with theory based on s-d scattering model.Comment: 3 pages, 3 figures, Appl. Phys. Lett 86, 202508 (2005

Non perturbative and thermal dynamics of confined fields in dual QCD

In order to study the detailed dynamics and associated non-perturbative features of QCD, a dual version of the color gauge theory based on the topologically viable homogeneous fiber bundle approach has been analysed taking into account its magnetic symmetry structure. In the dynamically broken phase of magnetic symmetry, the associated flux tube structure on a S 2 -sphere in the magnetically condensed state of the dual QCD vacuum has been analyzed for the profiles of the color electric field using flux quantization and stability conditions. The color electric field has its intimate association with the vector mode of the magnetically condensed QCD vacuum and such field configurations have been analyzed to show that the color electric flux gets localized towards the poles for a large sphere case while it gets uniformly distributed for the small sphere case in the infrared sector of QCD. The critical flux tube densities have been computed for various couplings and are shown to be in agreement with that for lead-ion central collisions in the near infrared sector of QCD. The possible annihilation/unification of flux tubes under some typical flux tube density and temperature conditions in the magnetic symmetry broken phase of QCD has also been analyzed and shown to play an important role in the process of QGP formation. The thermal variation of the profiles of the color electic field is further investigated which indicates the survival of flux tubes even in the thermal domain that leads the possibility of the formation of some exotic states like QGP in the intermedate regime during the quark-hadron phase transition

Polarographic Study of Cd(II) & Pb(II) Complexes of Tris-(hydroxymethyl)- aminomethane in Water & Aqeuous Methanolic Solutions

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Investment in technology is not enough to guarantee e-participation in politics

There have been a number of efforts to promote ‘e-participation’ in politics to give citizens a better voice in policymaking. Yet the success of these initiatives has varied substantially across the world. Pragati Rawat and John C. Morris argue that investment in technology alone is not enough for citizens to embrace these new avenues for participation. Governments must also provide a supportive environment with institutional structures that can facilitate the process

SYNTHESIS OF SOME NEW 1, 3-DI METHYL SUBSTITUTED GUANIDINE WITH POSSIBLE ANTIBACTERIAL AND ANTIFUNGAL ACTIVITY

The compounds containing thiazole, thiadiazole, oxazole, oxadiazole, imidazole, pyrimidine, pyridine & benzothiazole rings have been found to exhibit broad spectrum of biological activities.Derivatives of 1, 2, 4-thiadiazole and 1, 2, 4-thiadiazolidines exhibit antibacterial and antifungal activity1. Thiazolyl guanidines2 and various substituted aryl guanidine’s have been found to exhibit antibacterial & antifungal activities3.Keeping all these views in mind attempts were made to synthesized some new 1,3-di methyl Substituted Guanidine.In the present work 2,4 Dimethyl -3,5-(di Aryl imino)-1,2,4-thiadiazolidines were prepared by nitrous acid oxidation of N-methyl –N Aryl thiourea4 & 2,4 dimethyl-3,5-(diaryl imino)-1,2,4-thiazolidines were converted to corresponding 1,3 di methyl substituted guanidine’s by their acid catalyzed re-arrangment5.(Scheme-1)Antibacterial & Antifungal activity of the title compounds were evaluated against two bacteria, E.coli & lactobacillus & two fungi, A.Brassicicola & Aspergillus Niger. N=methyl-N`-Aryl thiourea (1-10) were prepared by refluxing a mixture of different 2-Amino Heterocyclic moieties with methyl iso thiocyanate in Ethanol.A mixture of compound (1-100 and conc. HCl, ethanol was added drop wise & under stirring to a solution of NaNO2 in water afforded 2, 4-dimethyl-3,5-(di Aryl imino)-1,2,4-thiadiazolidine (11-20) afforded 1,3 di methyl substituted guanidine’s (21-30). Structures of the compounds were established by elemental analysis & spectral data

A study of anaemia and its correlates among adolescent girls in schools of Haldwani, India

Background: Anaemia, a manifestation of under nutrition and poor dietary intake of iron is a public health problem, not only among pregnant women, infants and young children but also among adolescents. Anaemia among adolescent girls can result in impaired physical growth, poor cognition, reduced physical fitness and work performance and lower concentration on daily tasks.Methods: A cross-sectional descriptive study was carried out in schools of Haldwani, Uttarakhand, India with the objective studying various socio-demographic characteristics in relation to anaemia among adolescent girls. Multistage random sampling was used to select adolescent girls of 10 to 19 years of age who were interviewed and examined. Statistical analysis was done using Chi-square test and Odds ratios calculated with SPSS v21.Results: Around 371 girls in present study had varying severity of anaemia and majority had mild to moderate anaemia. Place of residence, type of school, birth order, type of family and mother occupation were significantly associated with presence of anaemia. Girls taking mixed diet were 1.23 times more likely to be non-anaemic as compared to girls taking vegetarian diet. Study showed adolescent girls consuming IFA tablets were less likely anaemic compared to those not consuming (OR=0.09, p<0.001).Conclusions: Among school going adolescent girls nearly half are still suffering from anaemia in India, despite the efforts of government and it is still a challenging public health problem

Kinetics of Oxidation of Hydrazine & Hydroxylamine by N-Chlorobenzamide

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Mechanism of Oxidation of Ascorbic Acid by N-Chlorobenzamide

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