Materials Literature
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Abstract Dynamic mechanical results are reported for segmental relaxation of monodisperse polystyrenes (PSs) with molecular weights of 0.7, 3, 18, and 104 kg/mol and bidisperse PSs created from blending pairs of these materials. The data for the monodisperse polymers confirm previous findings; namely, there is an incr…
A new system aimed at performing partial discharge measurements and condition assessment on electrical apparatus is presented. It is able to separate the conventional phase resolved partial discharge pattern into a series of sub-patterns, each of them containing partial discharge data generated by a single kind of def…
The intensity dependence of optical nonlinearity in a nematic liquid crystal doped with an azo-dye is investigated. The reorientational part of the nonlinearity changes from self-defocusing to self-focusing character while the intensity passes through the saturation value of trans-cis photoisomerization. This observat…
Investigation of the structural and vibrational properties of the ${\mathrm{Pb}}_{x}{\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{TiO}}_{3}$ (PCT) system exhibits two phase transitions in the range of $x=0--1$ by using x-ray powder diffraction and Raman spectroscopy. The first transition occurring at $x\ensuremath{\sim}0.6…
Abstract The aggregation behavior, binding to DNA and photophysical properties of meso ‐tetratolylporphyrins substituted with two ( P 2 ), three ( P 3 ) and four ( P 4 ) pyridinium groups were studied using UV–visible and transient spectroscopy, resonance light scattering, circular dichroism and time‐resolved luminesc…
In this paper, the mechanism of plasma-charging damage (PCD) of metal-insulator-metal (MIM) capacitors as well as possible protection schemes are discussed. A range of test structures with different antennas simulating interconnect layout variations have been used to investigate the mechanism of PCD of MIM capacitors.…
Vancomycin, the last line of defense antibiotic, depends upon the attachment of the carbohydrate vancosamine to an aglycone skeleton for antibacterial activity. Vancomycin is a naturally occurring secondary metabolite that can be produced by bacterial fermentation. To combat emerging resistance, it has been proposed t…
The ${\mathrm{LaMn}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{x}{\mathrm{O}}_{3}$ series has been studied by means of x-ray absorption spectroscopy at both Mn and Ga $K$ edges. A homovalent substitution between ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Ga}}^{3+}$ can be deduced from the x-ray absorption near-edge structure (XANES) s…
Abstract Aiming to develop a high‐performance fiber‐reinforced rubber from styrene–butadiene rubber (SBR), we applied a special technique using electron‐beam (EB)‐irradiation‐induced graft polymerization to ultrahigh‐molecular‐weight‐polyethylene (UHMWPE) fibers. The molecular interaction between the grafted UHMWPE fi…
In this work, a novel route to synthesize polymer/metal composite nanospheres has been proposed. This method combines the advantages that the polymer chains collapse and entangle in the presence of compressed CO(2), which acts as antisolvent, and the metal nanoparticles and polymers can be precipitated simultaneously…
A practical design method, which is based on the current shape, is presented to achieve the appropriate parameters of the flyback transformer. Through this method, a practical transformer is achieved, and its performance is verified by a step-up flyback converter, experimental waveforms and result are presented.
Brillouin and Raman spectroscopy were performed on B2O3 glass compressed to 57 GPa at 273 K. Upon compression the sound velocities increase smoothly and the boroxol ring Raman mode vanishes by 11 GPa. Upon decompression the sound velocities follow a different path and at 3 GPa a discontinuity of 3 km/s in V(p) and 2 k…
This work addresses thermodynamic and mechanical properties of styrene block copolymer (SBC) self-adhesive materials. Mixtures of polystyrene- block -polyisoprene- block -polystyrene (SIS triblock) copolymers with resin and their blends with polystyrene- block -polyisoprene (SI diblock) copolymers were investigated ex…
Epitaxial relationships between the surfaces of inorganic and bioorganic crystals can be an important factor in crystal nucleation and growth processes in a variety of biological environments. Crystalline cholesterol monohydrate (ChM), a constituent of both gallstone and atherosclerotic plaques, is often found in asso…
Charge state-resolved time-of-flight spectra were collected for 2.0 keV 23Na+ scattered from Au nanoclusters deposited on TiO2(110). The neutral fraction of Na scattered from metallic Au is low ( approximately 3%), but it is surprisingly high (up to 50%) for small clusters. The results demonstrate that alkali ions cou…
Future generation automobiles are being developed on fuel cell as the principal source of power generation in automobiles. Automobiles have fast changing load requirements like acceleration or sudden uphill, thus drastically increasing load torque. Fuel cell cannot respond to these fast changing load due to it's slow…
[reaction: see text] The enzymatic degradation of starch can be monitored electronically using single-walled carbon nanotubes (SWNTs) as semiconducting probes in field-effect transistors (FETs). Incubation of these devices in aqueous buffer solutions of amyloglucosidase (AMG) results in the removal of the starch from…
We have studied the complexation process taking place in cationic liposomes in the presence of anionic polyelectrolytes, in the polyion concentration range from the dilute to the concentrated regime, by combining dynamic light scattering and transmission electron microscopy techniques. We employed as the cationic lipi…
Abstract Pentacoordinate planar nonmetals (PPNs) centered in perfect pentagonal hydrocopper complexes Cu 5 H 5 X (X = B, C, N, O), as determined by density functional theory methods, are presented in this communication. The results obtained in this work complete the hypercoordinate planar carbon series with high symme…
A large variety of amphiphilic polylactide-grafted dextrans has been synthesized with controlled architecture through a three-step procedure: partial protection of the dextran hydroxyl groups by silylation; ring-opening polymerization of D, L -lactide initiated from remaining hydroxyl groups on partially silylated dex…