Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Polycrystalline samples of the strongly distorted $R{\mathrm{NiO}}_{3}(R=\mathrm{H}\mathrm{o},\mathrm{}\mathrm{Y},\mathrm{}\mathrm{E}\mathrm{r},\mathrm{}\mathrm{T}\mathrm{m},\mathrm{}\mathrm{Y}\mathrm{b},\mathrm{}\mathrm{Lu})$ perovskites have been prepared under high hydrostatic pressure, at 20 kbar. The crystal stru…
Crystallographic data, electrical and thermal transport measurements, and heat-capacity data are reported for several compounds with the filled skutterudite structure: ${\mathrm{Tl}}_{x}{\mathrm{Co}}_{4\ensuremath{-}y}{\mathrm{Fe}}_{y}{\mathrm{Sb}}_{12}$ and ${\mathrm{Tl}}_{x}{\mathrm{Co}}_{4}{\mathrm{Sb}}_{12\ensurem…
We investigate the thermal conductivity of bulk silicon crystals based on molecular-dynamics (MD) simulations. If it is taken that the system size must be larger than the phonon mean free path, several hundreds of millions of atoms must be computed for crystals with large thermal conductivity values such as Si. We dem…
Analytical expressions for the velocities of the longitudinal and the torsional sound waves in single-walled carbon nanotubes are derived using Born's perturbation technique within a lattice-dynamical model. These expressions are compared to the formulas for the velocities of the sound waves in an elastic hollow cylin…
A study of thermal conductivities perpendicular to the interfaces in ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}{/\mathrm{S}\mathrm{b}}_{2}{\mathrm{Te}}_{3}$ superlattices is presented. The lattice thermal conductivities in these short-period superlattices are less than those in homogeneous solid-solution alloys and exhibit a…
BiFeO 3 , when forming a solid solution with BaTiO3, shows structural transformations over the entire compositional range. Above 70 mole % of BiFeO3 the structure is rhombohedral and below 4 mole %, it is tetragonal. In between the structure is cubic. The ferroelectric TC decreases with increasing composition of BaTiO…
Diamond has some of the most extreme physical properties of any material, yet its practical use in science or engineering has been limited due its scarcity and expense. With the recent development of techniques for depositing thin films of diamond on a variety of substrate materials, we now have the ability to exploit…
Chirality-dependent van Hove singularities (vHs) of the one-dimensional electronic density of states (DOS) are discussed in connection with resonant Raman spectroscopy. The effect of trigonal warping on the energy dispersion relations near the Fermi energy splits the peaks of the density of states for metallic nanotub…
The perchloratoiron(III) complexes of a series of 2,6-disubstituted tetraphenylporphyrin ligands, where the 2,6-phenyl substituents were -H, -F, -Cl, -Br, or -OMe, as well as two 2,4,6-phenyl-substituted complexes, where the substituents were -Me and -OMe, have been investigated as a function of temperature by 1H NMR…
L-Malate (MalDH) and L-lactate (LDH) dehydrogenases belong to the same family of NAD-dependent enzymes. LDHs are tetramers, whereas MalDHs can be either dimeric or tetrameric. To gain insight into molecular relationships between LDHs and MalDHs, we studied folding intermediates of a mutant of the LDH-like MalDH (a pro…
The phase properties of 14 tetra- n -alkylammonium and -phosphonium salts with chloride, bromide, iodide, and perchlorate as anions and alkyl chain lengths from heptyl to octadecyl have been examined as neat solids and as gelators in thermally reversible organogels. These gelator structures are among the simplest inve…
The interaction of H 2 with the defect sites of the SiO 2 surface has been studied by means of gradient-corrected density functional theory calculations on cluster models. The mechanism of hydrogen dissociation, the energy of reactants and products, and the corresponding activation energies and transition states have…
In the research and development of various advanced technologies needed for decontamination and decommissioning of nuclear facilities, laser was applied to decontamination of metal and concrete surfaces and to cutting of large metal of low level radioactive waste. (a) Laser decontamination for metal waste: Metal waste…
Previous biophysical studies of tetrameric malate dehydrogenase from the halophilic archaeon Haloarcula marismortui (Hm MalDH) have revealed the importance of protein-solvent interactions for its adaptation to molar salt conditions that strongly affect protein solubility, stability, and activity, in general. The struc…
The size of metal copper particles supported on silica was studied as a function of the following parameters: the preparation route, the nature of the metallic precursor, the copper content, and the thermal pretreatments before reduction. Two modes of preparation were investigated: (i) incipient wetness impregnation w…
The dynamics of a model, originally proposed for a type of instability in plastic flow, has been investigated in detail. The bifurcation portrait of the system in two physically relevant parameters exhibits a rich variety of dynamical behaviour, including period bubbling and period adding or Farey sequences. The compl…
Pressure-dependent Raman scattering studies in the range 0.0 -- 32 kbar were carried out in L-alanine in order to investigate its external mode phonon spectra in relation to the phase transitions in the crystal. A careful analysis of the spectra shows that the low-energy Raman modes exhibit variation both in frequency…
Deposition/removal of metal atoms on the hex reconstructed (100) surface of Au, Pt and Ir should present intriguing aspects, since a new island implies hex -> square deconstruction of the substrate, and a new crater the square -> hex reconstruction of the uncovered layer. To obtain a microscopic understanding of how i…
Carboxylic acid- and anhydride-terminated polystyrenes of different molecular weights from 4500 to 672 000 were grafted from melt onto silicon substrates modified with epoxysilane monolayer . The grafted chains are densely packed with a density close to the known value for the bulk material. The tethered polymer layer…
We analyze the symmetry of all possible magnetic structures of bilayered manganites La_{2-2x}Sr_{1+2x}Mn_2O_7 with doping 0.3 <= x < 0.5 and formulate a corresponding Landau theory of the phase transitions involved. It is shown that canting of spins is not allowed at x=0.3 though is at x=0.4. The observed magnetic ref…