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Composite films containing silver nanoparticles embedded in diamond-like carbon (DLC) matrix were deposited on glass substrates by using capacitatively coupled plasma (CCP) chemical vapour deposition techninique (CVD). Particle size and metal volume fraction were tailored by varying the relative amount of methane of a gas mixture of methane + argon in the plasma. Optical constants of the films were evaluated. Bonding environment in these films were obtained from Raman and FTIR studies. Blue-shift of the surface plasmon resonance peak in the optical absorbance spectra of the films could be associated with the reduction of the particle size while red shift was associated with the increase in volume fraction of metal particles. The experimental results have been discussed in light of the existing Mie theory.
Clusters of phenomena were obtained by two clustering techniques, using the form and content of obsessions and compulsions. Significant clusters which emerged involved washing, checking, thoughts of past, and embarrassing behaviour. Depression occurred as a discrete cluster. Eighty-nine per cent of subjects could be fitted into at least one cluster; over half could be fitted into only one cluster. Washers and checkers made up more than half of the sample studied.
Electronic structure calculations on neutral and charged Mgn (n≤7) clusters and KnMgm mixed clusters have been carried out within a linear combination of atomic orbitals molecular orbital approach. The exchange correlaton effects have been treated via local spin density functional and non-local pseudopotentials have been used to replace the core. Our studies on charged Mgn clusters focus on the electron affinity and atomic binding in anionic clusters and the stability and observability of doubly ionized clusters. In KnMgm clusters, we have considered the evolution of the electronic spectrum and the variation of the binding energy with size and composition.
Inhalation of a foreign body into the respiratory passage can be a serious and sometimes fatal childhood accident. In this paper we analyze the management of 223 children with laryngo-tracheo-bronchial foreign bodies. Children below three years of age were found to be the most vulnerable. The majority of the patients were boys. Over a quarter of the patients did not present with a history of inhalation. Only 52 per cent reported within 24 hours of inhalation. Endoscopic removal was possible in all but nine cases. One hundred and fort eight (66.4 per cent) of the recovered foreign bodies were organic in origin, the majority of them being peanuts. In one hundred and five (47.1 per cent) the objects found their way into the right bronchial tree. There were two deaths. The modalities of diagnosis and management are discussed.
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