Institute of Physics, Bhubaneswar

About: Institute of Physics, Bhubaneswar is a facility organization based out in Bhubaneswar, Orissa, India. It is known for research contribution in the topics: Large Hadron Collider & Hadron. The organization has 566 authors who have published 1768 publications receiving 64889 citations.

Sediment quality, elemental bioaccumulation and antimicrobial properties of mangroves of Indian Sundarban

Abstract: Mangroves have wide applications in traditional medicines due to their several therapeutic properties. Potentially toxic elements (PTEs), in mangrove habitats, need serious concern because of their toxicity, bioaccumulation capacity and ecotoxicological risks. In the current study, we aimed to examine sediment quality and bioaccumulation of PTEs in a mangrove-dominated habitat of Sundarban, India, and their relation with antimicrobial property of ten mangrove species of the region. Antimicrobial activity of different solvent fractions of mangrove leaves was assessed against seven microorganisms. The highest antimicrobial activity was detected in ethyl acetate and acetone-extracted fractions of Avicennia alba. Various sediment quality indices revealed progressively deteriorating nature of surface sediment having moderate contamination, however, low ecotoxicological risk. The accumulation factors (AF) for different PTEs indicate a gradual metal bioaccumulation in leaf tissue. Antimicrobial activities indicated both positive and negative correlations with manganese (Mn), copper (Cu), iron (Fe) and zinc (Zn) concentrations of mangrove species. Concentration of Mn showed a significant correlation with almost all the fractions, whereas Cu had correlation with ethyl acetate, acetone and methanol fractions (P < 0.05). The AF of Mn and Cu exhibited correlation with antimicrobial activities of acetone and methanol fractions, whereas Fe and Zn had correlation with hexane and ethyl acetate fractions. Overall, Mn, Fe, Cu and Zn concentrations of Acanthus ilicifolius and Avicennia alba leaves and in the surface sediments demonstrated the strongest association (P < 0.05) with their antimicrobial activity as also depicted in correlation and cluster analysis studies. Thus, this study will help to establish a link between the PTEs in mangrove ecosystem with their bioactivity.

Inter-grain mediated intrinsic and extrinsic barrier layer network mechanism involved in Ca1Cu3Ti4O12 bulk ceramic

Abstract: This paper reports colossal dielectric constant (105 order) in the low-frequency region for sintered bulk ceramics of Ca1Cu3Ti4O12 (CCTO) super-capacitor. X-ray diffraction of sintered CCTO sample confirms cubic structure with Im3 space group. Analysis of micrograph on the parallel surfaces of the sintered solid exhibits the homogeneous distribution of grains and grain boundaries on the surface of the pellet. Detail study of Raman scattering data suggests the appearance of polarizable relaxation mode. Studies of capacitive and resistive characteristics of the material in a wide range of frequency of applied electric field and temperature shows that dielectric permittivity, energy loss, impedance, electric modulus and electrical conduction of the material are strongly affected by experimental conditions (frequency and temperature). A good correlation between above electrical parameters (resistance, capacitance, conductance, etc.) and the contents of microstructure (grains and grain boundary) of the material are established. It is expected that use of nano-size TiO2 and CuO2 powders in the initial stage with micron size powder of CaCO3 can help for rapid solid state reaction at microscopic level which is likely to be responsible for high dielectric constant of the material. Present findings suggest that CCTO can be considered as a potential candidate for super-capacitor devices.

Planckian Scattering of Non-Abelian Gauge Particles

Abstract: We present a systematic study of high energy scattering of non-Abelian gauge particles in (3+1)-dimensional Einstein gravity using semiclassical techniques of Verlinde and Verlinde. It is shown that the BRST gauge invariance of the Yang-Mills action in the presence of quantum gravity in the Planckian energy regime is maintained and the vertex operator is invariant under BRST transformations. The presence of gravitational shock wave describing the gauge particles is discussed in the resulting (3+1)-dimensional effective theory of Yang-Mills gravity.

Search for lepton-flavor violating decays of the Higgs boson in the μτ and eτ final states in proton-proton collisions at s =13 TeV

Abstract: A search is presented for lepton-flavor violating decays of the Higgs boson to μ τ and e τ . The dataset corresponds to an integrated luminosity of 137 fb - 1 collected at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV. No significant excess has been found, and the results are interpreted in terms of upper limits on lepton-flavor violating branching fractions of the Higgs boson. The observed (expected) upper limits on the branching fractions are, respectively, B ( H → μ τ ) 0.15 ( 0.15 ) % and B ( H → e τ ) 0.22 ( 0.16 ) % at 95% confidence level.

Fluctuations and criticality in quantum paraelectrics

Abstract: The temperature dependence of the static dielectric susceptibility of a system with strongly coupled fluctuating dipoles is calculated within a self-consistent mean fluctuation field approximation. Results are qualitatively in good agreement with a quantum paraelectric SrTiO(3) in the low temperature regime. We identify this system as a gapped quantum paraelectric and suggest a possible experimental realization of a quantum critical paraelectric through the application of hydrostatic pressure or doping by impurity.