Materials Literature
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Anisotropies of spin-projected wave functions are measured on a Pd∕Co multilayer system by measuring magnetic Compton profiles. The anisotropies of the wave functions are decomposed into the contributions of Co 3d states and Pd 4d states using an atomic model by a Hartree-Fock calculation assuming uniaxial (cylindrica…
BaNb 0.3 Ti 0.7 O 3 ∕ Si p-n junction combining the functional properties of oxide and Si electronics was fabricated by laser molecular-beam epitaxy, and the multifunctional properties of rectification, ferroelectricity and photoelectricity were experimentally studied. The good rectifying I-V characteristics, nanoseco…
We describe a directed vertical alignment (VA) display mode based on a nematic liquid crystal (LC) doped with a chiral dopant and confined between two substrates, one of which is pretreated, say, by unidirectional rubbing or photoalignment. The design allows one to eliminate umbilical defects that appear during switch…
Abstract A simple solid‐state NMR method was used to study the structure of 13 C‐ and 15 N‐enriched silk from two Australian orb‐web spider species, Nephila edulis and Argiope keyserlingi. Carbon‐13 and 15 N spectra from alanine‐ or glycine‐labeled oriented dragline silks were acquired with the fiber axis aligned para…
Abstract There is evidence to suggest that Cu(II) is involved in the natural spinning process of a silkworm helping to convert the concentrated silk fibroin (SF) solution (or dope) into tough insoluble threads. To investigate the interaction between SF and Cu(II), a series of regenerated SF (RSF) films with different…
The luminescence of Pr3+ or Mn2+ singly doped, as well as Pr3+ and Mn2+ codoped, SrB4O7 powder microcrystalline samples were investigated using synchrotron radiation. The photon cascade emission originating from the S01 level was observed in the SrB4O7:Pr3+ (0.1mol%) sample upon 206nm excitation. There are desirable s…
Abstract The ordered double perovskite Sr 2 MnTeO 6 was prepared by the freeze‐drying method. The nuclear and magnetic structures were determined by both X‐ray and neutron (D2B and D1B) powder diffraction. A distorted, double perovskite structure type described by the monoclinic P 12 1 / n 1 space group is observed at…
PURPOSE: To investigate the in vivo effects of gadodiamide (Gd-DTPA-BMA) and gadopentetate dimeglumine (Gd-DTPA) on the laboratory measurements of serum calcium, magnesium, and creatinine. MATERIALS AND METHODS: Medical records from 1993 to 2004 were reviewed to identify inpatients for whom laboratory data were availa…
The $\mathrm{A}\mathrm{B}{\mathrm{O}}_{3}$ type manganites ${(\mathrm{La}\mathrm{R})}_{0.45}{(\mathrm{Ca}\mathrm{Sr})}_{0.55}\mathrm{Mn}{\mathrm{O}}_{3}$ ($\mathrm{R}={\mathrm{Eu}}^{3+}$---a nonmagnetic ion and ${\mathrm{Tb}}^{3+}$---a magnetic ion) which possess large A-site size-disorder, exhibit metamagnetic transi…
The valence band structures of Al–N-codoped [ZnO:(Al, N)] and N-doped (ZnO:N) ZnO films were studied by normal and soft x-ray photoelectron spectroscopy. The valence-band maximum of ZnO:(Al, N) shifts up to Fermi energy level by about 300 meV compared with that of ZnO:N. Such a shift can be attributed to the existence…
Extensive transmission electron microscopy examinations confirm that twinning does occur upon large plastic deformation in nanocrystalline Ni, for which no sign of deformation twinning was found in previous tensile tests. Compelling evidence has been obtained for several twinning mechanisms that operate in nanocrystal…
Optically pumped lasing with low threshold and narrow linewidth was observed in a 4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4H-pyran dye-doped holographic polymer-dispersed liquid crystal transmission grating structure. The results showed that the lasing peak centered at about 609 nm, with a full width at ha…
Combining STM, LEED, and density functional theory, we determine the atomic surface structure of rutile ${\mathrm{TiO}}_{2}$ $(110)\mathrm{\text{\ensuremath{-}}}(1\ifmmode\times\else\texttimes\fi{}2)$: nonstoichiometric ${\mathrm{Ti}}_{2}{\mathrm{O}}_{3}$ stripes along the $[001]$ direction. LEED patterns are sharp an…
The structural and electronic properties of MnxGe1−x alloys (x⩽0.15) fabricated by ion implantation are investigated by means of x-ray diffraction and synchrotron radiation photoemission spectroscopy. The diffraction patterns point to the presence of ferromagnetic Mn5Ge3 nanoparticles; however, valence band spectra, i…
Abstract A relativistic DFT method (ZORA) is used to calculate the 183 W and 17 O NMR chemical shifts for the reduced polyoxotungstates W 5 O 18 W II NO 3– , γ‐SiW 12 O 40 6– , P 2 W 18 O 62 8– , and W 10 O 32 6– with different degrees of (de)localization of the electrons introduced. Despite some discrepancies in the…
A polarization-independent phase modulator using two thin homogeneously stratified but orthogonally oriented liquid crystal (LC) gels is demonstrated. In addition to polarization independence and submillisecond response time, the LC gel possesses a much larger phase change and lower operating voltage than the nanosize…
A direct correlation of structural and optical properties of MOCVD-grown ZnCdO-layers with a systematic variation of Cd-content has been achieved on a microscopic scale using highly spatially and spectrally resolved cathodoluminescence. The ZnCdO layer luminescence measured in cathodoluminescence wavelength images rev…
We have observed that the conductivity of graphene sheets is higher whenever they are loosely bound to the underlying bulk graphite. We also observe that certain edges of the graphene layers show sharp rise in current when biased, indicating enhanced electronic density of states spatially localized near those edges. I…
Abstract A synthetic strategy has been developed for the preparation of new peripheral amine‐ or ammonium‐terminated carbosilane dendrimers of type n G‐[Si(OCH 2 CH 2 NMe 2 ) y ] x or n G‐[Si(OCH 2 CH 2 NMe 3 + I – ) y ] x , respectively. It consists of the alcoholysis of well‐known chlorosilane‐terminated dendrimers…
Detailed impedance analysis of dense nanocrystalline SrTiO3 ceramics in comparison to microcrystalline samples gives direct and unambiguous evidence of a space charge overlap as a characteristic size effect. Owing to the significant extension of depletion zones for the holes, the bulk impedance signal disappears at ab…