Materials Literature
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Melt solid polycondensation is an approach to increase the molecular weight of poly (L‐lactic acid) (PLLA). For this report, the effect of crystallization time of PLLA prepolymer on the molecular weight of the biomaterial was studied. In this process, PLLA prepolymer with a molecular weight of 18,000 was first prepare…
A kind of poly(ethylene terephthalate) (PET)/Silica nanocomposite (PETS) was synthesized via in situ polymerization using the compatibility between silica nanoparticles and ethylene glycol (EG). Transmission electron microscopy (TEM) micrographs revealed that the silica nanoparticles were well dispersed in the PET mat…
The pressure-induced structural evolutions of CaSiO(3)-MgSiO(3) glasses have been examined by means of molecular dynamics simulation. Our calculations revealed that Si coordination remained unchanged up to 15 GPa, while modifier cations caused significant changes in the short-range order structure. In the present stud…
This paper describes a direct carbon fuel cell (DCFC) based on a solid oxide fuel cell (SOFC) system which has been used to assess the performance of a high surface area carbon fuel material. The cell, consisting of a co-fired anode, electrolyte, and cathode, has been produced by standard tape casting methods and is o…
Abstract Summary: A chitosan‐hydroxybenzotriazole (HOBt) aqueous solution prepared by simply mixing chitosan and HOBt in water provides an effective system to functionalize chitosan in an aqueous environment. This aqueous solution in combination with water‐soluble carbodiimide (WSC) allows the conjugation of functiona…
Single Aurivillius phase Bi 3− x La x TiNbO 9 (LBTN‐ x , x =0.00, 0.50, 0.75, and 1.00) ceramics were prepared by the conventional solid‐state reaction method. When x ≤0.50, the ceramics are normal ferroelectrics, while LBTN‐0.75 and LBTN‐1.00 showed typical relaxor behavior, which could probably be attributed to the…
A detailed discussion of the local linear combination of atomic orbitals (LCAO) orbital occupancy (OO) density functional approach, for calculating the total energy and electronic properties of solids, is presented. An approximation to the exchange-correlation energy within the OO approach is discussed to improve the…
The crystal structure of perovskite $\mathrm{Y}\mathrm{Co}{\mathrm{O}}_{3}$ has been studied by neutron powder diffraction up to high temperatures. The orthorhombic $Pbnm$ symmetry is confirmed in the whole temperature range. A significant isotropic enlargement of $\mathrm{Co}{\mathrm{O}}_{6}$ octahedra is evidenced a…
/sup T/he development of time-frequency and time-scale transforms has progressed rapidly over the last 20 years. The development and progression of numerical acquisition enable the utilization of these mathematical tools to analyze partial discharge in electrical equipment. This paper introduces a new transform, a Hil…
Core/shell nanoparticles with lipid core, were prepared and characterized as a sustained delivery system for protein. The lipid core is composed of protein-loaded lecithin and the polymeric shell is composed of Pluronics (poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer, F-127). Based…
Several factors impacting chemical degradation of perfluorinated sulfonic acid ionomers are identified in this paper. Based on the results from this study, gas crossover is the fundamental mechanism that leads to PFSA membrane chemical degradation. H2, O2 and a catalytic surface are required to generate H2O2/radicals.…
This investigation examines and compares the loading characteristics and power factor values of V-V, Scott, and Le Blanc-connected transformers by a novel approach. Four definitions of power factor are compared-three considering harmonics and unbalances and one based only on fundamental components. A proper power fact…
A tunable double-grating resonant leaky mode microelectromechanical-type element is introduced. A significant level of tunability is demonstrated by adjusting mechanically the structural symmetry of the grating profile. Tuning is also possible by variation of the thickness of the resonant layer. For a particular examp…
Nanoscale metal shells have many potential uses and in some applications offer significant advantages over nanoparticles. The synthesis of platinum nanoshells using stabilized nanodroplets of benzene in water as growth templates is described; the nanodroplets are stabilized by a surfactant-like tin(IV)-porphyrin compl…
An identification technique is described, based on a developed adaptive fuzzy logic network, that enables the recognition of partial discharges (PD) generated by different defects in heat-shrinkable joints and terminations of XLPE insulated power distribution cables. It is shown that different sources of PD can be ide…
The increasing usage of distributed power generation, leads to an increased short-circuit power in medium voltage grids. As a consequence, new concepts for limiting short-circuit currents are required. One possible solution is based on resonant circuits. These circuits are able to limit short-circuit currents fast, at…
Sb(III)-doped lead tungstate single crystals with controlled shapes and enhanced green emission have been synthesized via a facile, Pluronic P123 (EO(20)PO(70)EO(20))-assisted, sonochemical method. The surfactant Pluronic P123 was found to play a crucial role in the morphology control of the final products. The growth…
Abstract Sarcosine N ‐carboxyanhydride, D,L ‐alanine N ‐carboxyanhydride, D,L ‐phenylalanine N ‐carboxyanhydride, and D,L ‐leucine N ‐carboxyanhydride were polymerized with pyridine or N ‐ethyldiisopropylamine as the catalyst. With pyridine, cyclic oligo‐ and polypeptides were obtained in addition to water‐initiated o…
Abstract Summary: Variations of the effective activation energy E of glass transitions have been determined by applying an isoconversional method to DSC data on the glass transition in PVC, PBMA, PVP, and PEN. A variability parameter Δ E has been introduced to characterize the rate of decrease in E with increasing tem…
In this paper, we develop a macroscopic framework quantifying the hysteresis and constitutive nonlinearities inherent to ferromagnetic materials. In the first step of the development, we construct Helmholtz and Gibbs energy relations at the mesoscopic or lattice level based on the assumption that magnetic moments or s…