Materials Literature
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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…
The ligand-assisted templating method for the production of mesoporous Ta 2 O 5 was improved by the removal of noncoordinating alkylamine surfactant before aging. The improved method increased the uniformity of the porous structure and the particle size. The immediate precipitation after the hydrolysis of the alkylami…
Raman and optical experiments have been performed on a lead zinc niobate [Pb(Zn1/3Nb2/3)O3 or PZN] single crystal oriented along (111) under zero-field cooling, and zero-field heating after field cooling conditions. At high temperature, the Raman spectra originate from a phonon–polarization coupling whose selection ru…
Nanostructured coatings on metals, plastics, and textiles have numerous applications, for example, as antifogging and self-cleaning coatings as well as protective coatings against corrosion, heat, or wear. Here the preparation at low temperature of dense nanostructured tetragonal ZrO2 coatings via a modified emulsion…
Considers the effect of low temperatures on the characteristics of lead‐free alloys based upon tin, which is the most popular basis for the new alloys.
The study of perovskite manganites La0.7Sr0.3Mn1—xCrxO3 has been carried out. The structure, magnetic and electrical properties of La0.7Sr0.3Mn1—xCrxO3 manganites are strongly dependent on the doping level x. The little difference between the ionic radii of Cr3+ and Mn3+ causes no change in the structure, the structur…
The paper presents a new methodology for calculating magnetizing inrush currents. Similarly to the seminal work of Rajakovic and Semlyen, all the calculations are conducted in the frequency domain, hence, circumventing the many problems encountered when time domain simulations are used to solve this problem. Unlike th…
The structure and microstructure of laser-deposited La1−xSr x MnO3(x ≈ 0.1) films on SrTiO3(100) single-crystal substrates have been studied by means of electron diffraction and high-resolution transmission electron microscopy. The film–substrate interfaces are found to be perfectly coherent and in particular to be fr…
The primary candidate for the barrier/etch stop layer in damascene process is silicon nitride. However, silicon nitride has a high dielectric constant. To reduce the effective dielectric constant in the copper damascene structure, silicon carbide, which is prepared by plasma enhanced chemical vapor deposition (PECVD)…
The microstructures of BME‐X7R ceramics have been investigated by imaging and analytical TEM. By varying the sintering conditions (pressing, sintering temperature and atmosphere), the microstructure changes drastically, and dislocation loops can be observed. These defects most probably are caused by an ordering of oxy…