Materials Literature
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This paper presents the measured and analyzed responses of the partial discharge (PD) when it propagates in a power network from its origin to the measuring nodes. On and offline measurements are done in a power network consisting of a 16.5-kV/250-MVA-rated power generator, busbar, and step-up transformer. The simulta…
The behaviour of helium in Ti crystals at 300 K has been investigated by means of the molecular dynamics. The study is focused on the influences of He–Ti interaction on the aggregation of helium atoms in the substrate. When a Born–Mayer potential is used to describe the He–Ti interaction, the He atoms are unable to cl…
The all-electron full potential augmented plane-wave plus local orbital (APW+lo) method with the local-density approximation (LDA) is used to calculate the static equation of state (EOS) and elastic constants of crystalline GaSe. After the full relaxation of atomic positions, the calculated band structure at ambient p…
A transfer of a VA-SWNT film onto a conductive surface has been achieved using a novel "flip-over" technique. The top surface of a VA-SWNT film was covered by entangled bundles in an as-grown sample. When a VA-SWNT film was flipped over, an optically flat surface consisting of the tips of very well aligned, clean bund…
In den Käfig gesperrt: Eine Familie von Isopolyoxowolframat-Clustern der Zusammensetzung [H4W19O62]6− mit einem Clusterkäfig (blau), der identisch mit dem der Heteropolysäuren vom Dawson-Typ (rot) ist, wurde entdeckt. In den Clustern liegt eine einzelne trigonal-prismatische oder oktaedrische {WO6}6−-Einheit statt der…
Abstract Summary: Exfoliated Na + ‐MMT/polyamide‐6 and intercalated organic MMT/polyamide‐6 nanocomposites were prepared using sodium montmorillonite with water dispersion and organic MMT with acetone dispersion via anionic ring‐opening polymerization, respectively. The effects of Na + ‐MMT and OMMT on the polyamide‐6…
Ultrafine poly(m‐phenylene isophthalamide) (PMIA) fibers from PMIA solution in an ionic liquid via dry‐jet‐wet electrospinning technology are described. The morphology of the fibers with and without treatment in a coagulation water bath in the dry‐jet‐wet‐electrosinning process was observed by scanning electrical micr…
Naturally occurring bacteriochlorophyll(BChl)s-c, -d, and -e from green sulfur photosynthetic bacteria were self-assembled in an aqueous solution in the presence of octadecyltriethoxysilane and tetraethoxysilane, followed by polycondensation of the alkoxysilanes by incubation for 50 h at 25 degrees C. The resulting BC…
Electrical properties and crystallization behaviour of Si–Sb–Te films were studied and compared with those of a Ge 2 Sb 2 Te 5 film. The resistivity ratio of Si–Sb–Te films can reach 10 6 during the amorphous–crystalline transition, accompanied with a small thickness change (less than 3%). The melting temperature of S…
Dispersion of carbon nanotubes in a polymer matrix is one of the most critical issues in carbon nanotube/polymer composites. In this paper we discuss the considerable improvement in the dispersion of multiwalled carbon nanotubes (MWNTs) in poly(vinyl alcohol) (PVA) matrix that was attained through gum arabic treatment…
Samples of a nematic mixture of ZLI1132 and of a twisted nematic mixture composed of ZLI1132 and chiral inductor S811, including 1%-10% (w/w) 4-N,N-dimethylaminoazobenzene (DAB), (4'-nitro)-4-N,N-dimethylaminoazobenzene (NDAB), spiropyran (SP), or spirooxazine (SO) were irradiated to produce the photochromic transform…
The mechanical properties of polycarbonate film embedded with carbon nanofibers were studied based on plasma surface modification of carbon nanofibers by the use of polystyrene. The nanofiber surfaces were modified by various processing conditions including plasma polymerization power, nanofiber concentration, and ult…
Abstract Polyhedral oligosilsequioxane (POSS) tethered aromatic polyamide nanocomposites with various POSS fractions were prepared through Michael addition between maleimide‐containing polyamides and amino‐functionalized POSS. The chemical structures of the polyamide–POSS nanocomposites were characterized with Fourier…
Lanathum (La)‐doped Fe3O4 magnetic nanoparticles were prepared in aqueous solution at room temperature, then La‐doped Fe3O4‐polyaniline (PANI) nanocomposites containing a dispersion of La‐doped Fe3O4 nanoparticles were synthesized via in‐situ polymerization of aniline monomer. The structure and properties of the synth…
Abstract Diblock copolymer poly(1,1,3, N,N ′‐pentamethyl‐3‐vinylcyclodisilazane)‐ block‐ polystyrene (polyVSA‐ b ‐polySt) and triblock copolymer poly(1,1,3, N,N ′‐pentamethyl‐3‐vinylcyclodisilazane)‐ block‐ polystyrene‐ block ‐poly(1,1,3, N,N ′‐pentamethyl‐3‐vinylcyclodisilazane) (polyVSA‐ b ‐polySt‐ b ‐polyVSA), cons…
The power factor measurement is widely used in the evaluation of bushing insulation conditions in the field. Some measurement issues occur in the field tests which give abnormal readings of bushing C/sub 1/ and/or C/sub 2/ power factors. This paper provides an engineering analysis of the possible measurement issues in…
This paper introduces a novel technique for modeling, in the time domain, a power transformer with nonlinear and hysteretic behavior. The model is particularly suitable for harmonic or protection studies where the transformer is driven into the nonlinear regime. The technique uses a single-phase two-winding transforme…
PdZn (1:1) alloy is assumed to be the active component of a promising catalyst for methanol steam reforming. Using density functional calculations on periodic supercell slab models, followed by atomistic thermodynamics modeling, we study the chemical composition of the surfaces PdZn(111) and, as a reference, Cu(111) i…
The thermo-chemical expansion of Solid Oxide Fuel Cell (SOFC) component materials exposed to different partial pressures of oxygen (PO2) was studied and a model developed that fits the resulting data. Thermo-chemical expansion is made up of two parts, the expansion due to temperature and the expansion due to changes o…
The goal of this research is to increase the metal-organic concentration in Kapton-like polyimides (PIs) to achieve increased atomic oxygen (AO) resistance while retaining desirable film properties. Co-polyamic acid (PAA) precursors were prepared using a novel polymer building block, mellitic acid dianhydride (MADA),…