Lead adsorption study on combustion derived <Emphasis Type=Italic>γ</Emphasis>-Fe<Subscript>2</Subscript>O<Subscript>3</Subscript> surface

New combustion synthetic route for the synthesis of nanosized γ-Fe₂O₃ by microwave-assisted route is reported. X-ray density, tap density and powder density of prepared γ-Fe₂O₃ are calculated. Adsorption study of Pb²⁺ on combustion derived nanosized γ-Fe₂O₃ is studied by dynamic method. The γ-Fe₂O₃ structure and lead adsorbed γ-Fe₂O₃ (Pb-γ-Fe₂O₃) are studied by X-ray diffraction (XRD). Additional lead peaks in Pb-γ-Fe₂O₃ sample pattern confirm the lead adsorption. Morphology of as prepared γ-Fe₂O₃ and Pb-γ-Fe₂O₃ is studied by scanning electron micrograph (SEM) technique. Varied morphology for Pb-γ-Fe₂O₃ compared to its γ-Fe₂O₃ is observed. Variation of bonding in Pb-γ-Fe₂O₃ sample due to lead adsorption is viewed by infrared spectroscopic (IR) technique. Energy dispersive X-ray microanalysis (EDX) is scanned for the lead adsorbed γ-Fe₂O₃ to know the presence of lead on γ-Fe₂O₃ surface. The eluent lead solution is characterized by atomic absorption spectroscopy (AAS) and solution conductivity (SC). Reduction in the concentration and increase in conductance of eluent lead solution is observed. The potential use of solid adsorbents for the adsorption of heavy metal pollutants is envisaged in the present work.     

Comprehensive approach to modeling threshold voltage of nanoscale strained silicon SOI MOSFETs

A comprehensive approach for modeling the threshold voltage of nanoscale strained silicon-on-insulator (SSOI) and strained Si-on-SiGe-on-insulator (SSGOI) MOSFETs is presented. The model includes the effect of strain in terms of Ge mole fraction and various other device parameters—channel length, channel doping, strained silicon film thickness, gate oxide thickness and gate work function. The accuracy of the proposed threshold voltage model is verified using two-dimensional numerical simulations. We have also demonstrated that our model can accurately predict the DIBL effects.     

Plasma-activated immobilization of biomolecules onto graphite-encapsulated magnetic nanoparticles

We describe the amino group surface functionalisation of graphite-encapsulated iron compound nanoparticles by radio frequency (RF) plasma processing followed by oxidized dextran immobilization. We have found that surface treatment using plasma represents an important step before biomolecules immobilization. After plasma treatment, the dispersion property of nanoparticles in dextran solution in water was significantly improved. The successful dextran immobilization was confirmed by X-ray photoelectron spectroscopy (XPS) and high resolution-transmission electron microscopy (HR-TEM) analyses followed by amino group derivatization using 4-(trifluoromethyl)-benzaldehyde (TFBA). As an evidence for covalent bonding between nanoparticles and dextran, the area percentage of deconvoluted CN peak at ～389.6 eV increased from 0% to 10.53 ± 1.30% with increasing the dextran concentration. The result is consistent with the evidenced decreasing of the free amino group percentage from 68.09 ± 5.10% to 14.73 ± 5.89% on the nanoparticle surface after dextran immobilization.     

Erosion efficiency-a new parameter to characterize the dominant erosion micromechanism

A new parameter called erosion efficiency, capable of identifying the dominant micromechanism leading to solid particle erosion, has been introduced in this paper. The objective of this paper is to demonstrate the usefulness of this parameter by considering the large body of data in the literature pertaining to the solid particle erosion of metallic materials, ceramics, cermets and coatings under normal impact conditions.     

Synthesis of MoO3 and its polyvinyl alcohol nanostructured film

The synthesis of ultrafine MoO₃ through a self-propagating combustion route employing polyethylene glycol as fuel is reported. The precursor molybdenum oxalate is employed in this study for the conversion of the precursor to ultrafine MoO₃ particles. The solvent casting method is adopted for the synthesis of MoO₃ dispersed polyvinyl alcohol nanostructured film (MoO₃-PVA). These synthesized MoO3 and their composite samples are characterized for their structure, morphology, bonding and thermal behaviour by XRD, SEM, IR and DSC techniques, respectively. The distribution of MoO₃ in polyvinyl alcohol gives a crystalline polymer, a compact structure and an increase in glass transition temperature.     

The IA-64 Itanium processor cartridge

The Itanium processor cartridge is a packaging optimization for electrical and thermal performance in a server environment. The 3-in. x 5-in. cartridge contains the Itanium CPU, up to 4 megabytes of level-3 (L3) cache, an innovative power delivery scheme, and an integrated vapor chamber thermal spreading lid for removing power. Cartridges and a chip set can be ganged electrically by means of a glueless bidirectional, multidrop system bus. Power is delivered through a custom connection with separate voltages for the 0.18-micron CPU and 0.25-micron custom cache devices. An I²C serial connection provides access to system management features such as temperature monitoring and cartridge identification information     

Revealing the geology of the Great Nicobar Island,Indian Ocean,by the interpretation of airborne synthetic aperture radar images

A number of new geological structures have been revealed in the Great Nicobar Island, Indian Ocean, from the analysis of airborne synthetic aperture radar (SAR) data. The advantages of SAR images for mapping geological structures over other images for the Great Nicobar Island, the southern most island of Andaman-Nicobar arc, have been highlighted. A visual analysis of lineaments in the southern part of the Great Nicobar Island using SAR and Landsat TM colour composites, TM bands 2, 3, and 4, and TM bands 4, 2 and SAR, reveals a wealth of structural information not shown on previous maps. Other identified features include lithological units derived from landforms, northwest-southeast trending faults, faults trending towards the mouth of Galathea river, the graben valley, and many other new faults. The geological features reported in this work were verified using limited ground checking.     

Editorial: Mobile Networks in the Era of Big Data

Mobile Networks and Applications -