Materials Literature
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Two modeling methods are used to predict the tensile properties of air-jet spun yarns. A numerical simulation provides a useful insight into the flow characteristics and wrap ping formation process of edge fibers in the nozzle of an air-jet spinning machine. By analyzing the results of the numerical simulation, the ef…
Abstract The two new compounds Mn 2 (L)Sb 2 S 5 (L = diethylenetriamine = DIEN, N-methyl-1,3- diaminopropane = MDAP) were prepared under solvothermal conditions using the elements as starting materials. Both compounds crystallise in the monoclinic space group P2 1 /c with the lattice parameters a=10.669(7), b=12.805(2…
A new method is proposed for the treatment of Raman spectra of amorphous-nanocrystalline silicon films serving as a major component in solar cells. The method is based on the well-known theory of strong spatial localization (confinement) of phonons and offers the possibility of estimating the fractional content of the…
We describe a technique for measuring heat capacities (Cmin≈1 μJ/K at 0.1 K) of small solid samples at low temperatures (0.03 K<T<6 K) and in high magnetic fields (B<12 T). In this compensated heat-pulse technique the thermal losses are compensated through a background heating. A detailed analysis…
The purpose of this study was to investigate the degradation in performance of four major alloys of orthodontic wires, namely nickel-titanium, beta titanium, stainless steel, and cobalt-chromium-nickel, caused by hydrogen absorption during short-term immersion in an acid fluoride solutions. The hydrogen-related degrad…
The effect of chitosan on the growth and morphology of Fusarium oxysporum f. sp. albedinis (Foa), the causal agent of Bayoud disease, and its ability to elicit a defence reaction against this fungus in date palm roots were investigated. Chitosan at 1 mg ml-1 reduced the growth of Foa on potato dextrose agar medium by…
In this work, a model based on field criterion has been developed to represent the flashover phenomenon, which occurs due to surface pollution on high voltage insulators, under ac voltage. The values of potential and electric field on an insulator surface have been determined using the finite element method (FEM). The…
Abstract Two samples of isotactic polypropylene (iPP) representing the crystalline α‐ and β‐modifications are compared with regard to their semicrystalline morphology and the resulting micromechanical mechanisms. Processes at room temperature (23°C) and at −40°C have been investigated by means of different microscopic…
A mean-field theory for the geometry and diffusive growth rate of soap bubbles in dry 3D foams is presented. Idealized foam cells called isotropic Plateau polyhedra (IPPs), with F identical spherical-cap faces, are introduced. The geometric properties ( e.g. , surface area S , curvature R , edge length L , volume V )…
Abstract Nanostructured Zn x Cd 1 – x S (0 ≤ x ≤ 1) thin films were synthesized by CVD on SiO 2 substrates using M( O ‐ i PrXan) 2 (M = Zn,Cd; O ‐ i PrXan = S 2 COCH(CH 3 ) 2 ) as precursor compounds. The method of preparation used consisted in the sequential deposition of single‐phase MS coatings (M = Zn,Cd) at 300 °…
The effect of annealing on $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ thick single and multilayer amorphous carbon $(a\text{\ensuremath{-}}\mathrm{C})$ films prepared by filtered cathodic arc is investigated. Single layer films, with a $s{p}^{2}$ to $s{p}^{3}$ bonding fraction of approximately $50%$ incr…
Abstract A procedure to determine the chemical state of copper in differently prepared catalysts is proposed. It is based on a peak decomposition of the main Cu 2p 3/2 signal only, which involves both Cu(II) and Cu(I) contributions. The presence of the closest shake‐up satellite is related to the Cu(II) contribution o…
Abstract Although the structure of particulate filled polymers is usually thought to be very simple, often structure related phenomena determine their properties. Segregation occurs only when long flow paths and large particles are used in production. The occurrence and extent of aggregation depend on the relative mag…
The chemical environment responsible for the brittle fracture failure of composite (non-ceramic) insulators is determined. Also previously reported observations by the authors are verified. Five non-ceramic composite suspension insulators and one composite guide were subjected to FTIR analysis. Out of the six field fa…
A planar converter containing quantum dots as wavelength-shifting moieties on top of a solar cell was studied. The highly efficient quantum dots are to shift the wavelengths where the spectral response of the solar cell is low to wavelengths where the spectral response is high in order to improve the conversion effici…
Abstract Films of polypropylene (PP)/SiO 2 , PP/ZnO and PP/SiO 2 ZnO nanocomposites have been prepared. SiO 2 and ZnO were prepared by the sol–gel method and mixed with dispersant (Efka) and coupling agent (thiocyanatopropyltriethoxysilane) before being introduced to melted PP in an internal mixer. The transmission o…
Thin films of Pb(Zr 0.4 Ti O.6 )O 3 produced by chemical solution deposition were used to study the effects of stress from different platinized single‐crystal substrates on film orientation and resulting electrical properties. Films deposited on MgO preferred a (001) orientation due to compressive stress on the film d…
The conditions under which corona first occurs for any set of electrodes are an important design consideration since corona can limit the performance of any given configuration of electrical conductors. Here, the 60 Hz ac corona onset voltage for a stranded wire in air is calculated. The criterion involves the charact…
Seven strains of sulfate-reducing bacteria (SRB) were tested for the accumulation of polyhydroxyalkanoates (PHAs). During growth with benzoate Desulfonema magnum accumulated large amounts of poly(3-hydroxybutyrate) [poly(3HB)]. Desulfosarcina variabilis (during growth with benzoate), Desulfobotulus sapovorans (during…
Abstract Clay minerals from soils of a red-black soil complex developed from basaltic parent material in Sardinia are formed along a short toposequence (200 m). At the foot of the sequence, a clay-rich, black Vertisol forms, whereas at the summit, the soil is a dark reddish-brown Inceptisol. X-ray diffraction, infrare…