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[en] Bias current dependence of a superconducting strip photon detector is studied in the wavelength range of 405 to 1310 nm. The detector is made of an MgB2 meander pattern with the line width of 135 nm and thickness of 10 nm. At 1310 nm, the detection efficiency exponentially decreases as the bias current decreases. While at 405 nm, the detection efficiency almost saturates in the high bias current region. These features suggest that the intrinsic detection efficiency of the MgB2 detector is high at 405 nm.
[en] We have performed measurements of the local magnetic field distribution of YBCO coated conductors using Low-temperature Scanning Hall Probe Microscopy (LT-SHPM). Distribution of stray magnetic field of various types of YBCO coated conductors in the superconducting state was measured in presence of external magnetic fields. We analyzed one dimensional and two dimensional local current distribution using inversion technique from the magnetic field distribution.
[en] The complexation ability of coumarin 153 linked to monoaza-15-crown-5 was studied. On complexation by alkaline earth metal ion, both absorption and emission spectra undergo a marked red shift whereas the effects are weaker with alkali metal ions. Owing to the participation of the carbonyl group of the coumarin, the stability of the complexes is much higher than those observed with previously described fluoro-phores linked to monoaza-15-crown-5. The stability of the complexes remains high enough in acetonitrile-water mixtures for practical application to the determination of cation concentrations in aqueous samples to be possible. (author). 9 refs.; 3 figs.; 1 tab
[en] The effect of graphene inclusion in the ex-situ MgB2 was analyzed with the help of resistivity behavior and critical current density studies. Amount of graphene was systematically varied from 0% for pristine sample to 3% by the weight of MgB2. Graphene that is considered as a good source of carbon was found to be intact without any significant carbon doping in MgB2 structure as reveled by XRD measurements. There was no signature of graphene inclusion as far as the superconducting transition is concerned which remained same at 39 K for all the samples. The transition width being sensitive to defect doping remained more or less about 2 K for all the samples showing no variation due to doping. Although there was no change in the superconducting transition or transition width, the graphene doped sample showed noticeable decrease in the overall resistivity behavior with respect to decrease in temperature. The graphene inclusion acted as effective pinning centers which have enhanced the upper critical field of these samples.
[en] Certain conditions to prepare ptatungstates of alkaline earth metals are described. The identification of their anion using the method of IR spectroscopy is carried out. All IR spectra of heptatungstates of alkaline earth metals are similar to the structure of the initial sodium heptatungstate. They are characterized by the absorption bands at 855, 890, 900, 950 cm-1. IR spectra of heptatungstates can be used to identify different paratungstates
[en] Since there is lack in the excited electronic states of alkaline earth compound, candidate for ultracold investigation, and by using an ab initio calculation the potential energy curves have been obtained for the lowest electronic states in the 2s+1Λ(±) representation below 53000 cm-1 along with the harmonic frequency we, the internuclear distance re, the rotational constant Be, and the electronic energy with respect to the ground state Te. The comparison of these values to the theoretical and experimental results available in the literature shows a good agreement. (author)