Materials Literature
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Ab initio NMR gauge-including atomic orbital (GIAO) calculations were used to constrain assignments of resonances in 27 Al NMR spectra of F-bearing alkali aluminosilicate glasses. The effect of bond angles within the range 126-150° on the chemical shift was investigated using cluster models of next-nearest atoms that…
This paper deals with the evaluation of the insulation design of polymer housed surge arresters for distribution lines. Five commercial designs were tested in a salt fog chamber for 9 cycles using a cycle consisting of 120 hours of salt fog that was followed by a 48 hour rest period for a total of 1280 hours of salt f…
Morpholine-2,5-dione and D,L-3-methylmorpholine-2,5-dione were polymerized with 2,2-dibutyl-2-stanna-1,3-dioxepane (DSDOP) as initiator with variation of time and monomer/initiator (M/I)-ratio. For comparison a few polymerizations were initiated with Sn(II) 2-ethylhexanoate. The DSDOP initiated polymerizations gave sl…
The tree initiation voltage of impregnated crosslinked polyethylene (XLPE) with a dielectric liquid is drastically improved compared to normal XLPE for both ac and impulse voltage application. It is considered that liquid fills the polymer free volume, and removes space for electrons to be accelerated to high energy.…
A novel mechanism for debonding at a weak interphase in an all‐oxide composite is introduced. This methodology involves the use of alumina platelets that have a diameter of 10–15 or 5–10 μm and a thickness of 1 μm. The platelets induce constrained sintering of the ceramic powder, which results in permanent porosity. F…
Current–voltage j(V) characteristics of barium titanate based positive temperature coefficient of resistivity thermistors were analyzed in terms of space charge limited current, trap-filled limited current, Frenkel–Poole, double-Schottky barrier, and small radii polaron models. It is shown that for the double-Schottky…
Abstract This paper concentrated on the objective evaluation of total hand value in knitted fabrics using the theory of neural networks and the comparison of two methods. For the objective evaluation of overall hand feeling in knitted fabric, 47 kinds of weft‐knitted and warp‐knitted fabrics were manufactured. The opt…
The cholesteric liquid crystal (CLC) phase may selectively reflect light. The reflection wavelength is correlated with the CLC helical pitch and the wavelength bandwidth δδ with the birefringence. Recent studies have aimed to broaden δδ from several tens - an order of magnitude usually encountered in literature - to s…
Characteristics of the dielectric relaxation mechanisms (γ, β, β’, α and ρ) in poly(methyl methacrylate) (PMMA) and hybrids of PMMA polymerized into 5 nm SiO2 pore matrices were studied by means of the thermally stimulated depolarization currents (TSD) technique, applied in the range 10–460 K. Low frequency relaxation…
A robust evolutionary approach is proposed for the synthesis of multilayer coatings at oblique light incidence. The proposed approach consists of global and local strategies by integrating decreasing mutations and self-adaptive mutations via family competition and adaptive rules. Numerical results calculated at normal…
The effect of the gamma-irradiation on the mechanical properties of the composites, Polypropylene (PP), PP+high density Polyethylene (HDPE), PP+ HDPE+wood flour, where HDPE is virgin and recycled, was studied. This paper discusses the behavior of the composites after exposure to various doses of gamma irradiation (1–7…
The passivation and the resistance to pitting corrosion of a 21%Cr-7%Ni-2%Mo-2%Mn-1%Cu duplex stainless steel in neutral and alkaline buffered solutions, with and without chloride ions, was studied using electrochemical techniques. Results are explained through changes in the structure and composition of the passive l…
A new synthetic route for the preparation of well-defined model polyelectrolyte networks based on the photodimerization of monodisperse star polymers, bearing terminal anthryl groups, is presented. Poly(tert-butyl methacrylate) (PtBMA) star precursor polymers were prepared via living anionic polymerization. 1-(2-anthr…
Barium aluminosilicate (BAS) glass‐ceramic composites reinforced with various volume percents (0, 10, 20, 30, 40 vol%) of SiC whiskers were fabricated by hot pressing. The microstructure, the whisker/matrix interface structure, the phase constitution, and the mechanical properties of the composites were systematically…
The threshold stress intensity (KISCC) of stress corrosion cracking (SCC) for 40CrMo steel in 3.5% sodium chloride (NaCl) solution decreased exponentially with the increase in the yield strength, σys (i.e., KISCC = 1.38 × 106exp[–8.26 × 10–3σys]). The threshold stress intensity of hydrogen-induced cracking (KIH) durin…
High‐strength joining of Si 3 N 4 ceramics has been achieved by developing a process that effectively eliminates the seam, and may allow for fabrication of large or complex silicon nitride bodies. This approach to joining is based on the concept that when sintering aids are effective in bonding individual grains, they…
This paper investigates the application of a theoretical model to predict the flashover of practical post type insulators. In particular, the model is applied to two 132 kV designs with different profiles and leakage path lengths. It is found that arc shortening due to inter-shed and inter-rib flashover and arc moveme…
A computationally efficient and accurate description of interatomic interactions is indispensable to the fidelity of atomistic simulations. In the development of popular empirical potentials, it is assumed that atoms separated beyond a certain cut-off distance have negligible interatomic forces and hence may be safely…
Interactions of meso-tetra-(4-N-oxyethylpyridyl) porphyrin (TOEPyP(4)), its 3-N analog (TOEPyP(3)) and their Co, Cu, Ni, Zn metallocomplexes with duplex DNA have been investigated by uv/visible absorbance and circular dichrosim spectroscopies. Results reveal the interactions of these complexes with duplex DNA are of t…
Contour optimization of axi-symmetric insulators in multi-dielectric arrangements by a neural network (NN) has been carried out to obtain not only a uniform but also a complex electric stress distribution along the insulator surface. Three case studies have been reported In detail. Multilayer feed-forward networks wit…