Integrability and Conformal Symmetry in the BCS model

The exactly solvable BCS Hamiltonian of superconductivity is considered from several viewpoints: Richardson's ansatz, conformal field theory, integrable inhomogenous vertex models and Chern-Simons theory.Comment: Latex with macros included, 12 pages, Proceedings of the NATO Advanced Research Workshop on Statistical Field Theories, Como 18-23 June 2001. Editors: Andrea Cappelli and Giuseppe Mussardo. to be published by Kluwer, Academic Publishers. Corrected some typos and further acknowledgment

Indoor radon concentration and its possible dependence on ventilation rate and flooring type

The results of radon concentration measurements carried out in dwellings with natural ventilation for 1 y in Bangalore are reported. Measurements, covering three sessions of the day (morning, afternoon, night) were performed two times in a month for 1 y at a fixed place of each dwelling at a height of 1 m above the ground surface in selected dwellings. The low-level radon detection system (LLRDS), an active method, was used for the estimation of radon concentration. The measurements were aimed to understand the diurnal variation and the effect of ventilation rate and flooring type on indoor radon concentration. The geometric mean (± geometric standard deviation) of indoor radon concentration from about 500 measurements carried out in 20 dwellings is found to be 25.4 ± 1.54 Bq m. -3. The morning, afternoon and night averages were found to be 42.6 ± 2.05, 15.3 ± 2.18 and 28.5 ± 2.2 Bq m. -3, respectively. The approximate natural ventilation rates of the dwellings were calculated using the PHPAIDA-the on-line natural ventilation, mixed mode and air infiltration rate calculation algorithm and their effects on indoor radon concentrations were studied. The inhalation dose and the lung cancer risk due to indoor radon exposure were found to be 0.66 mSv y. -1 and 11.9 per 10. 6 persons, respectively. The gamma exposure rate was also measured in all the dwellings and its correlation with the inhalation dose rate was studied. © The Author 2011. Published by Oxford University Press. All rights reserved

Radiation dose from dissolved radon in potable waters of the Bangalore environment, South India

Potable waters from various locations of the Bangalore environment were investigated for their 222Rn concentrations by the emanometry method. About 94 groundwater (borewell) samples were analysed for 222Rn concentrations and found to vary in the range 5.3–283.4 Bq L−1 with a mean value of 87 Bq L−1. Frequency distribution showed the 222Rn concentration in a large number of samples in the range of 0–50 Bq L−1. From the measured concentrations, the effective doses (lung and stomach) for the population of the region were estimated. The effective dose was found to vary from 42.6 to 2280.2 µSv y−1 with a mean value 702.5 µSv y−1. The effect of boiling of water showed a drastic reduction in the 222Rn concentration. The results of the present investigation are systematically analysed, compared with the literature values and discussed

Residential radon exposure in some areas of Bangalore city, India

Two isotopes, 222Rn and 220Rn of the natural radioactive gas radon are generally of radiological importance. About half of the total radiation effective dose to the general public is due to the irradiation of the lungs by alpha particles following the inhalation of radon decay products. In view of this, 222Rn and 220Rn measurements were carried out for a period of 1 year in about 50 dwellings belonging to different residential areas of Bangalore city. The results obtained were systematically analysed and discussed. Materials and Methods: 222Rn and 220Rn measurements were carried using Solid State Nuclear Track Detectors. The gamma exposure rate measurements were also carried out in all the dwellings using a G M tube based Environmental Radiation Dosimeter. Results: The concentration of 222Rn and 220Rn was found to be highest in the dwellings having mud flooring (Bare) and lowest in the dwellings having mosaic flooring. The geometric mean values of the concentrations of 222Rn and 220Rn were found to be 24.1 ± 8.3 and 24.5 ± 10.8 Bq m-3 respectively. The annual mean value of the gamma absorbed dose rate is found to be 175.8 nGy y-1. Conclusion: The mean value of radon concentration is well within the indian average (42 Bq m-3) and world average (40Bq m-3) values. The mean effective dose was found to be 1.19 mSv y-1 and is well within the action level as prescribed by ICRP-65

Comparative analysis of the effect of post-annealing on CeO2 and DC Magnetron Sputtered WO3/ CeO2 nanorods thin films for smart windows

This study investigates and evaluates thin films of WO3 (Tungsten Oxide) coated CeO2 (Cerium Oxide) Nanostructure (NR) for electrochromic applications. Using CH4N2O (Urea) and Ce(NO3)3.6H2O (Cerium Nitrate Hexahydrate) on a fluorine-doped tin oxide (FTO) base, cerium oxide nanorods were produced hydrothermally. Cerium Oxide nanorods were coated with a thin coating of WO3 using DC magnetron sputtering under argon gas at room temperature. In a three-electrode electrochemical system, thin sheets of manufactured WO3/CeO2 nanorods (NRs) served as the working electrode, saturated Hg/HgCl2 served as the reference electrode, and platinum wire served as the counter electrode. To produce the 0.5 M electrolyte, the H2SO4 solution was diluted in deionized (DI) water. Electrochromic tests revealed a 12.15 cm2/C coloring efficiency for annealed 10 µL HCl CeO2/WO3 film. A scanning electron microscope (SEM), an electrochemical analyzer, an X-ray diffraction spectrometer, and an ultraviolet-visible spectrometer were used to study the optical properties, composition, surface morphology, and electrochromic property of the generated thin films. Due to its high charge capacity and optical transmission properties, CeO2 nanorods with WO3 coating have proven to be a practical material for electrochromic devices (ECD)

Oral Myiasis: Report of 3 cases

Myiasis commonly refers to invasion of live human or animal tissue by fly larvae of the Diptera family. Infestationof tissues of vertebrate species is pandemic. Myiasis frequently found in tropical and subtropical countries wherepoor hygiene, poor housing infrastructure,warm humid climate, and proximity with domestic animals prevail. Oralmyiasis is a rare pathology and a risk to the patient’s life. Its diagnosis is made basically by the presence of larvae.Herewith presenting 3 cases of oral myiasis of oro-dental complex

Multifunctional La10Si6O27:Tb3+ tailored material for photoluminescence, photocatalysis and electrochemical sensing applications

La10Si6O27: Tb3+ (1–9 mol%) materials were synthesized by the combustion method and characterized by PXRD, PL, CV, EIS and UV–Vis spectroscopy to explore its photoluminescent, electrochemical and photocatalytic properties. These materials exhibited crystalline and single phases even after doping Tb3+ ions into the lattice of La10Si6O27. PL analysis confirms a tunable and maximum emission for optimized concentration. Electrochemical analysis shows La10Si6O27:Tb3+ (9 mol%) electrode as a paracetamol and penegra sensing material. The average specific capacitance of this electrode at 10 mVs−1 was found to be 262 Fg−1. A Photocatalysis study was performed using La10Si6O27:Tb3+ (5 mol%) material as a photocatalyst for the degradation of direct green dyes. Therefore, La10Si6O27:Tb3+ can be used as a multifunctional material for photoluminescence, photocatalysis, and electrochemical sensing applications