Higher critical current density achieved in Bi-2223 High-Tc superconductors

AbstractBi2Sr2Ca2Cu3Ox (Bi-2223) were prepared using a solid state reaction method at different sintering times and temperatures. Structural phase identifications have been done using X-Ray analysis and refinement by Reitveld method which proves the coexistence of Bi-2223 and Bi-2212 phases. The critical transition temperature Tc and critical current density Jc values were measured using superconducting quantum interference device magnetometer (SQUID) and by the magneto-optics technique. A remarkable rapid decrease to the diamagnetic signal in the magnetization versus temperature M(T) at 110 K and Jc around 1.2 × 107 A/m2 at 5 K are confirmed for the Bi-2223 compound

Role of Sm+3 ions on structural, optical and radiation shielding properties of lead borosilicate glasses

lead borosilicate glasses comprising samarium oxide (Sm2O3) had been developed by using melt-quenching procedure. The values of glass density became reported to enhance as Sm2O3 raise from 3.632 g/cm3 for 1 percent Sm2O3 to 3.764 g/cm3 for 6 percent Sm2O3, were attributable to the substitution of boron with lower density by samarium with higher density. The molar volume of the samples prepared was calculated from the density data. Optical absorption spectra have been reported and optical parameter values like the optical transformation, optical electronegative behavior, index of refraction, high frequency constant of dielectric, singular oscillator energy and dispersive energy have been calculated. The optical parameters were associated with the Sm2O3 ratio. Judd–Official concept has been extended to the glass absorption spectra to the model of radiative and laser properties. Judd–Official parameters (Ω2, Ω4, Ω6) were defined as Ω2 > Ω4 > Ω6 and linked to the composition of glass. Such glasses have been realized to be used as photonic devices. The maximum &amp; least MAC values were obtained at the energies of 15 keV &amp; 6 MeV for all Sm-Glasses. The trend of the LAC values follows the trend: (LAC)Sm1 < (LAC)Sm2 <(LAC)Sm3 <(LAC)Sm4 < (LAC)Sm5 < (LAC)Sm6. The HVL of the Sm-glasses were lower than those of ordinary concrete and RS-360. Thus, indicates that the Sm-glasses absorbs photon better than these two materials and can be used in their instead especially where space is a constrain

Phytochemical characterisation and bioactive properties of Solanum sodomaeum L. fruits at two stages of maturation

Introduction: Solanum sodomaeum L. has been observed to have several medicinal properties, in particular, in the treatment of several types of human skin cancer. Objective: The influence of the maturation stage of S. sodomaeum fruits on the total lipid contents, fatty acid profiles, essential oil yields and compositions, as well as the antibacterial and antioxidant activities of the essential oils, was investigated. Methods: The fatty acid and essential oil constituents were identified using gas chromatography (GC) and GC–mass spectrometry (GC–MS). The antioxidant properties of essential oil and vegetal oil were assessed using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging and reducing power assays. The antibacterial ac-tivity of essential oil was tested using the disc diffusion assay for resistance in human pathogenic bacteria. Results: Mature fruits showed higher total lipid content (17%) and were characterised by polyunsaturated fatty acids (53.87%), represented mainly by linoleic acid (53.11%). Similar yields of essential oils were detected for immature (0.43%) and mature (0.45%) fruits. Tetrahydronaphthalene (41.79%) was detected as the major essential oil component at the immature stage versus dihydrocoumarin pentane (18.27%), hexadecanoic acid (17.43%) and 2-undecanone (13.20%) in mature fruits. The DPPH test showed that essential oils had better antioxidant properties; however, the vegetal oils showed better performance in the reducing power assay. Moreover, the essential oil of S. sodomaeum mature fruits was active against bacterial strains. Conclusions: S. sodomaeum fruits could be a valuable source of natural antioxidants and antibacterial agents

Phytochemical characterisation and bioactive properties of Solanum sodomaeum

Introduction: Solanum sodomaeum L. has been observed to have several medicinal properties, in particular, in the treatment of several types of human skin cancer. Objective: The influence of the maturation stage of S. sodomaeum fruits on the total lipid contents, fatty acid profiles, essential oil yields and compositions, as well as the antibacterial and antioxidant activities of the essential oils, was investigated. Methods: The fatty acid and essential oil constituents were identified using gas chromatography (GC) and GC–mass spectrometry (GC–MS). The antioxidant properties of essential oil and vegetal oil were assessed using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging and reducing power assays. The antibacterial ac-tivity of essential oil was tested using the disc diffusion assay for resistance in human pathogenic bacteria. Results: Mature fruits showed higher total lipid content (17%) and were characterised by polyunsaturated fatty acids (53.87%), represented mainly by linoleic acid (53.11%). Similar yields of essential oils were detected for immature (0.43%) and mature (0.45%) fruits. Tetrahydronaphthalene (41.79%) was detected as the major essential oil component at the immature stage versus dihydrocoumarin pentane (18.27%), hexadecanoic acid (17.43%) and 2-undecanone (13.20%) in mature fruits. The DPPH test showed that essential oils had better antioxidant properties; however, the vegetal oils showed better performance in the reducing power assay. Moreover, the essential oil of S. sodomaeum mature fruits was active against bacterial strains. Conclusions: S. sodomaeum fruits could be a valuable source of natural antioxidants and antibacterial agents