Materials Literature
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The phenomenon of bistable hysteresis in magnetic resonance of conduction electrons in solids is discussed, particularly the case of gallium oxide β-Ga 2 O 3 . This memory effect is a consequence of the dynamic polarization of nuclei by the Overhauser effect and manifests itself by a hysteresis of the ESR line provide…
The polyborates Cs(2)M(2)B(10)O(17) (M = Na, K) have been prepared and their structures determined by single-crystal X-ray diffraction methods. They crystallize in the monoclinic space group C2/c (Z = 8) with unit-cell parameters a = 21.643(3) Å, b = 6.558(2) Å, c = 11.072(2) Å, beta = 105.43(1) degrees, V = 1514.8(6)…
New layered perovskite compounds, LiLnTiO4 (Ln=La and Eu), have been synthesized by an ion-exchange reaction from parent sodium compounds, NaLnTiO4. The crystal structures of LiLaTiO4 and LiEuTiO4 were determined by Rietveld analysis of the powder X-ray diffraction (XRD) patterns. The lithium ion-exchanged compounds r…
The paper presents the results of electric field and energy computation on insulating surfaces covered by water in the form ranging from small discrete droplets to large wet patches. The goal of this study was to understand the differences in the flash-over performance of outdoor insulators, in particular nonceramic i…
We report the results of a systematic orientation study on side-chain liquid crystalline polymers (SCLCPs) mechanically stretched in different mesophases. Two representative polyacrylate-based SCLCPs were used. The study demonstrates that the macroscopic orientation of the mesogens reflects a direct alignment of the l…
Scanning tunneling microscopy and optical spectroscopy of CdS nanoclusters and nanocluster self-assemblies were used to study the influence of capping ligands and cluster concentration on the aggregation process. Results are compared with TEM and X-ray diffraction data. Interaction and bonding between these self-conne…
The properties of the water contained in anionic clays have been investigated as a function of precalcination temperature and gallery height using quasi elastic neutron scattering (QENS). Two representative samples which differ in the geometry of the anions and the latter's hydration chemistry were used. The QENS resu…
Two mismatches, G.G and I.I, have been incorporated at the central position of 5'd-(GCCACXAGCTC).d(GAGCTXGTGGC) in order to carry out NMR and molecular dynamics studies. These duplexes constitute the sequence 29-39 of the K-ras gene coding for the glycine 12, a hot spot for mutation. The NMR spectra show that the dupl…
The structural elucidation of seven related oxypregnane-oligoglycosides stephanosides K (1), L (2), M (3), N (4), O (5), P (6), and Q (7) from the fresh stem of Stephanotis lutchuensis var. japonica (Asclepiadaceae) was achieved through on a detailed study of their high-field 1H- and 13C-NMR spectra. The results show…
The strengths of the $^{5}$${\mathit{D}}_{0}$${\mathrm{\ensuremath{-}}}^{7}$${\mathit{F}}_{\mathit{J}}$ (J=0,2,4) optical transitions of the ${\mathrm{Sm}}^{2+}$ ion in solids, which are due to the forced electric dipole transition, are analyzed by taking into account not only the Judd-Ofelt mechanism but also the exc…
Article Preparation of Dissolving Pulp from Sugar Cane Bagasse, and its Acetylation Under Homogeneous Solution Condition was published on January 1, 1996 in the journal Holzforschung (volume 50, issue 3).
New determinations of quantitative forward rate constants for reactions of titanium monomer cation with C 2 H 6, C 3 H 8, H 2 O, NH 3, and O 2 are accomplished using a high-pressure (multicollision) flow tube reactor. These experiments were prompted by our observation of conflicting reports in the literature. The reac…
Thermograms of fine, medium and coarse fibres prepared by cutting, milling and freezegrinding at 5°, 20° and 50°C/ min heating rates were compared. Scanning electron microscopy revealed that fibre ends prepared by the three methods were distinctly different from each other and, in addition, the mean length of the fibr…
The Fresnel diffraction of periodic objects at rational fractions of the Talbot distance is described in terms of the Wigner distribution function (WDF). The analysis provides a heuristic model for understanding the formation of the diffraction patterns as well as for evaluating the complex amplitude at any fractional…
First-principle electronic structure calculations are used to describe the magneto-optical properties of MnBiAl alloys as a function of the Al concentration. The calculated Kerr rotation and ellipticity are in good agreement with the experimental data for MnBi. Due to lack of good structural information, the magneto-o…
The compound tetrakis( tert -butylammonium)- cyclo -tetrametavanadate(V), the first oxovanadate salt isolated from aqueous solution which contains a discrete unprotonated [V 4 O 12 ] 4 - anion, undergoes an irreversible, reconstructive, continuous, and heterogeneous phase transition in the solid state by means of a nu…
Single crystal X-ray and neutron diffraction is essential for determining occupancies, positional as well as static and dynamic displacement parameters in crystalline matter by measuring Bragg, satellite or diffuse reflections. In our contribution a new low-temperature high pressure cell for neutron single crystal dif…
Several tellurometalates of the general formula [MTe(7)](n)()(-) (n = 2, 3) have been isolated as salts of organic cations by reaction of suitable metal sources with polytelluride solutions in DMF. The [HgTe(7)](2)(-) anion has the same structure in both the NEt(4)(+) and the PPh(4)(+) salts except for a minor change…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTRemoval of Acetal, Silyl, and 4,4'-Dimethoxytrityl Protecting Groups from Hydroxyl Functions of Carbohydrates and Nucleosides with Clay in Aqueous MethanolJun-ichi Asakura, Morris J. Robins, Yukihiro Asaka, and Tong Hei KimView Author Information Departments of Biochemistry and…
Accelerating irradiation growth has been reported for several zirconium alloys with a range of metallurgical states during high-temperature tests in fast-breeder reactors (673 to 723 K) for annealed Zircaloys in thermal test reactors at power reactor temperatures (523 to 623 K) and in power reactor core components fab…