Materials Literature
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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…
Recently, n-type semiconducting diamond was successfully obtained by sulfur doping using CH 4 /H 2 S/H 2 plasma chemical vapor deposition (CVD). It was reported that the crystal quality too was improved by the sulfur doping. In this study, the equilibrium geometry and the band structure of S- and O-doped diamond have…
We have demonstrated that the scaling of IrO x (Pb(Zr, Ti)O 3 :PZT)/Ir capacitors can be extended into the submicron regime. The submicron IrO x /PZT/Ir capacitors were fabricated using a one-mask stack-etch process, integrated with an SiO 2 interlayer dielectric, and contacted with Al metallization. The aggregate ele…
With the aim of developing new oligothiophene-based liquid crystals involving hydrogen bonding, new terthiophene derivatives containing an alkylamide group, N,N'-distearyl-2,2' : 5',2"-terthiophene-5,5"-dicarboxamide (DNC183T) and N,N'-dialkyl-5,5"-dibromo-2,2' : 5',2"-terthiophene-4,4"-dicarboxamides (DNCnDBr3T, n =…
Summary • The chemistry, crystallography and ultrastructure of intracellular calcium oxalate deposits in the angiosperm, Dracaena sanderiana are reported here. • Crystalline deposits extracted from mature leaves and leaf primordia of D. sanderiana were studied by scanning electron microscopy and X‐ray powder diffracto…
The influence of the chromium content and of the volume fraction of primary carbides on the thermal oxidation behaviour of spin cast high speed steels and semi-high speed steels used for the production of hot mill rolls was studied at 700°C. Oxidation nucleates at the carbide–matrix interface and carbides have a highe…
The novel complex precursor Eu(hfa)3·monoglyme and the analogous Eu(hfa)3·diglyme [Hhfa = 1,1,1,5,5,5-hexafluoroacetylacetone, monoglyme = CH3OCH2CH2OCH3, diglyme = CH3O(CH2CH2O)2CH3] have been synthesized in a single step reaction and characterized by elemental analysis, mass spectrometry, and IR and Raman spectrosco…
Abstract It was found that the stability of organogel of methyl-4, 6-O-benzylidene-α-d-glucopyranoside (1) is sensitively affected by a minute amount of concomitant water: the maximum stability is observed at [H2O]/[1] = 1.0. The effect of water molecules on the organogel stability is well understood in relation to it…
Abstract To characterize the evolution of dioctahedral interstratified clay minerals in the Golden Cross epithermal deposit, New Zealand, hydrothermally altered volcanic rocks containing the sequence smectite through illite-smectite (I-S) to muscovite were examined by optical microscopy, X-ray diffraction (XRD), scann…
The structure of the tryptophan synthase alpha-subunit from Pyrococcus furiosus was determined by x-ray analysis at 2.0-A resolution, and its stability was examined by differential scanning calorimetry. Although the structure of the tryptophan synthase alpha(2)beta(2) complex from Salmonella typhimurium has been alrea…