Materials Literature
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GaN-based light-emitting diodes (LEDs) on patterned sapphire substrate (PSS) with patterned composite SiO(2)/Al(2)O(3) passivation layers and TiO(2)/Al(2)O(3) distributed Bragg reflector (DBR) backside reflector have been proposed and fabricated. Highly passivated Al(2)O(3) layer deposited on indium tin oxide (ITO) la…
Preparing new ternary compounds via traditional high temperature synthesis techniques is essentially limited to ternary compounds that are thermodynamically more stable than any mixture of binary compounds because binary compounds typically form as reaction intermediates. By using a precursor having elemental layers t…
We investigate the nuclear isotropic shielding constants σ((13)C) and σ((17)O) of isomers of retinoic acid and retinal in gas-phase and in chloroform, acetonitrile, methanol, and water solutions via Monte Carlo simulation and quantum mechanics calculations using the GIAO-B3LYP∕6-311++G(2d,2p) approach. Electronic solu…
The knowledge of residual plastic strains is a prerequisite for studying the stress corrosion cracking in dissimilar metal welds common to nuclear power plant structures. In this work, the distribution of residual equivalent plastic strains in a multipass dissimilar metal weld composed of nickel alloy 82 and austeniti…
Structural transformation of MIL-53(Al) metal organic framework from large pore to narrow pore form (lp → np) or vice versa is known to occur by adsorption of certain guest molecules, by temperature change or by applying mechanical pressure. In this work, we perform a systematic investigation to demonstrate that adsor…
The syntheses and electrochemical/optical properties of some branched and linear 1,1′-substituted ferrocene complexes for molecular electronics are described. Metal centers were extended (and where relevant, connected) by arylethynyl spacers functionalized with m- pyridyl, tert- butylthiol (S t Bu), and trimethylsilyl…
The self-assembly of two topological isomers of a handcuff catenane has been achieved by utilizing the template-directed synthesis between the π-electron-rich bis-1,5-dioxynaphtho[50]crown-14 and the precursors to two fused π-electron-deficient cyclobis(paraquat-p-phenylene) cyclophanes. Characterization of the produc…
Previous research within friction stir welding (FSW) has demonstrated that online control of welding parameters can improve the mechanical properties and is necessary for certain applications to guarantee a consistent weld quality. One approach to control the process is by adapting the heat input to maintain a stable…
The reaction mechanism of lignin pyrolysis in hydrogen plasma has been studied by using phenethyl phenyl ether as the model compound. Density functional theory was employed here. Many possible reactions were proposed. All calculations were performed in the Gaussian 09 program, and the reaction enthalpies and activatio…
Lysine carbamylation, a post-translational modification, facilitates metal coordination for specific enzymatic activities. We have determined structures of the vertebrate dihydropyrimidinase from Tetraodon nigroviridis ( Tn Dhp) in various states: the apoenzyme as well as two forms of the holoenzyme with one and two m…
This study investigated the coculture of chondrocytes and mesenchymal stem cells (MSCs) on electrospun fibrous polymer scaffolds to produce polymer/extracellular matrix (ECM) hybrid constructs with the objective of reducing the number of chondrocytes necessary to produce ample cartilage-like ECM within the scaffolds.…
Five amino acids (Y105, Y176, Y189, Y189, W207) that constitute the substrate binding site of PHB depolymerase PhaZ7 were identified. All residues are located at a single surface-exposed location of PhaZ7. Exchange of these amino acids by less hydrophobic, hydrophilic or negatively charged residues reduced binding of…
The synthesis of cement and gypsum plaster nanomodified by water-soluble fullerenols was performed. The experimental data demonstrates an extreme increase in the specific impact resistance of nanomodified samples compared with nonmodified.
Aluminum alloy A356 is of significance for numerous applications. The mechanical properties of A356 would be enhanced considerably if reinforced by thermodynamically- stable nanoparticles. However, it is very challenging to disperse nanoparticles uniformly in A356 melts for casting A356 nanocomposites. In this study,…
The flux weakening mechanism of interior permanent magnet synchronous machines with segmented permanent magnets (PMs) in the rotor is studied in this paper. Air gap flux density with and without segments are analyzed and compared, based on both analytical and finite element methods. Frozen permeability technique is us…
We study the effect of realistically rounding nanorod antennae and gap antennae on their far field and near field properties. The simulations show that both scattering behaviour and polarisation charge distribution depend significantly on rounding. Rounding is also seen to have a major effect on coupling between nanos…
AIMS: The objective of this study was the isolation and characterization of chitin-degrading micro-organisms from the faeces of the insectivorous Goeldi's monkey, Callimico goeldii. METHODS AND RESULTS: Faeces samples were screened for chitin-degrading bacteria using basal medium in which chitin was included as the ca…
Rajbari district of Bangladesh, have been studied and possible health effect were estimated. The experiment has been done by using gamma ray spectrometry system consisting of a HPGe detector coupled with MCA and associate electronics. The average natural radioactivities of 238U, 232Th and 40K have been measured as 29.…
We present the results of a molecular simulation study of polarizability anisotropy relaxation of liquid acetonitrile confined in approximately cylindrical silica pores of diameters in the range of 20-40 Å. Grand Canonical Monte Carlo simulation is used to determine the density of acetonitrile in pores in equilibrium…
The Ni6C(CO)9(AuPPh3)4 bimetallic carbide carbonyl cluster was obtained from the reaction of [Ni9C(CO)17](2-) with Au(PPh3)Cl. It contains a rare carbon-centered (distorted) Ni6C octahedral core decorated by four Au(PPh3) fragments. These are μ3-bonded to four contiguous Ni3-triangular faces and display weak intramole…