Materials Literature
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The optical absorption and excitonic properties of wurtzite ZnO are investigated by means of an ab initio approach taking into account electron-hole correlations. This is done by solving the Bethe-Salpeter equation, using the results of density functional theory calculations as a starting point. Our main focus is the…
This paper presents approximate equations that may be used to obtain the lower cutoff frequency f/sub L/ and higher cutoff frequency f/sub H/ and thereby the bandwidth of a current transformer. The equations are validated by a PSpice simulation. The Bode plots for both low-frequency range and high-frequency range for…
Abstract The effect of the blending ratio of a polyurethane matrix and oil‐palm empty fruit bunch (EFB) fibers on the mechanical properties of biocomposite boards has been studied. The PU matrix and EFB fibers were used at blending ratios of 25:75, 30:70 and 35:65 (by weight). The mechanical property of hardness was s…
We report here the function of L-serine O-acetyltransferase (SAT) from the glutamic acid-producing bacterium Corynebacterium glutamicum. Based on the genome sequence of C. glutamicum and the NH(2)-terminal amino-acid sequence, the gene encoding SAT (cysE) was cloned and expressed in C. glutamicum. Deletion analysis of…
A novel analogue drive circuit for a liquid crystal cell has been designed. The design was realised in a 0.5 µm CMOS process and eight phase-locked channels with independent voltage control were developed. The channels were shown to produce over 5.6π optical phase shift using a ±2.5 V power supply. This drive circuit…
Local structures and cation distributions in perovskite Ca(Zr,Ti)O 3 solid solutions were analyzed using X-ray absorption fine structure and pair-distribution functions obtained from total neutron scattering. The analyses revealed that the Zr−O and Ti−O bond distances in the solid solutions remain distinct and close t…
Nanoporous silica films have been synthesized by self-assembly on substrates by dip-coating from a combined solution of aged silica oligomers and poly(ethylene oxide) 20 −poly(propylene oxide) 70 −poly(ethylene oxides) 20 triblock copolymer (Pluronic P123) in ethanol and water. The films are indexed with the rhombohed…
Ethylene/methacrylic acid (E/MAA) ionomers contain polyethylene crystallites, amorphous polymer segments, and ionic aggregates. While the property changes observed upon neutralization of the MAA units are often attributed to the formation of ionic aggregates, no quantitative description currently exists for how these…
The crystal structure of a charge-transfer salt, (BDTA)2[Co(mnt)2], where BDTA is 1,3,2-benzodithiazolyl and mnt is maleonitriledithiolate, consisted of an alternating stacking column of a head-to-head BDTA+ dimer and a planar [Co(mnt)2]2- dianion at 253 K. Magnetic measurements and structural analyses revealed a phas…
Abstract Rubber‐toughened polypropylene (PP) nanocomposites containing organophilic layered silicates were prepared by means of melt extrusion at 230 °C using a co‐rotating twin‐screw extruder in order to examine the influence of the organoclay and the addition of PP grafted with maleic anhydride (PPgMAH) as a compati…
Copper nanoparticles containing diamond-like carbon (Cu-DLC) films have been prepared on the Si substrate using electrochemical deposition method by choosing dimethylsulfoxide as carbon source and acetonitrile solution of [Cu(CH3CN)4]ClO4 as dopant at relatively low voltage (150 V). The composition, structure and morp…
Alternating-current (ac) magnetic susceptibility measurements for tris(dipicolinato) complexes with a trivalent heavy lanthanide ion, [N(C2H5)4]3[Ln(dipic)(3)] x nH2O (dipic = pyridine-2,6-dicarboxylate; Ln = Tb, Dy, Ho, Er, Tm, or Yb) are reported. While none of the six complexes showed a magnetization lag from the a…
Here we develop a simple method by using flow fluctuation to synthesize arrays of multi-branched carbon nanotubes (CNTs) that are far more complex than those previously reported. The architectures and compositions can be well controlled, thus avoiding any template or additive. A branching mechanism of fluctuation-prom…
Alternating sequences of pyridine-2,6-dicarboxamides and meta-(phenylazo)azobenzenes have been assembled into oligomers composed of four (8) and eight (9) azobenzene linkages. X-ray crystallography confirmed that oligomer 8 adopts a two-turn helical conformation with a helical pitch of approximately 3.4 Angstroms in t…
This paper is devoted to numerical simulations of the magnetization dynamics driven by a spin-polarized current in extended ferromagnetic multilayers when a point-contact setup is used. We present (i) detailed analysis of methodological problems arising by such simulations and (ii) physical results obtained on a syste…
Stabilized with a polyelectrolyte complex, superparamagnetic wires were prepared from Fe3O4 nanoparticles and used to fabricate structures of a complex architecture on solid substrates by manipulating the wires in an external magnetic field.
BACKGROUND: Local delivery of carmustine (BCNU) via biodegradable polymers has been shown to improve survival in patients with glioblastoma multiforme (GBM). In the current study, we hypothesized that local delivery of an anthracycline antibiotic, doxorubicin (DOX), might act to improve the survival of animals bearing…
We measured the infrared vibrational properties of bulk and nanoparticle $\mathrm{W}{\mathrm{S}}_{2}$ in order to investigate the structure-property relations in these materials. In addition to the symmetry-breaking effects of local strain, nanoparticle curvature modifies the local charging environment of the bulk mat…
We present a phenomenological model based on the thermodynamics of the phase separated state of manganites, accounting for its static and dynamic properties. Through calorimetric measurements on ${\mathrm{La}}_{0.225}{\mathrm{Pr}}_{0.4}{\mathrm{Ca}}_{0.375}\mathrm{Mn}{\mathrm{O}}_{3}$ the low temperature free energies…
We examine the temperature dependence of the relaxation times of the molecules N@C60 and N@C70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS2 solution. The results are inconsistent with the fluctuating zero field splitting (ZFS) mechanism, which is commonly invoked to explain electron spin…