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。
Inelastic x-ray scattering data from water at $5\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ show a variation of the velocity of sound from 2000 to 3200 $\mathrm{m}/\mathrm{s}$ in the momentum transfer range $1--4{\mathrm{nm}}^{\ensuremath{-}1}$. The transition occurs when, at $\ensuremath{\approx}4\mathrm{meV}$, th…
Electric field orientation of carbon nanotubes has been demonstrated using electrophoresis in isopropyl alcohol. The carbon nanotubes move towards the cathode during this process. The nanotubes align along the electric field due to the anisotropy of their electrophoresis velocity. The mobility has been estimated to be…
The growth of bulk crystals of organic salts with large chromophoric has received little attention, despite the importance of crystal quality for both applications and research. Here, the growth of the title compound (DAST), see Figure, is reported and the main results of the linear, nonlinear, and electro‐optical cha…
A thorough sequence analysis of the various members of the eukaryotic protein serine/threonine phosphatase 2C (PP2C) family revealed the conservation of 11 motifs. These motifs could be identified in numerous other sequences, including fungal adenylate cyclases that are predicted to contain a functionally active PP2C…
The effect of a postdeposition anneal on the structure and dielectric properties of epitaxial BaxSr1−xTiO3 (BST) thin films (x=0.35–0.65) have been measured. The films were grown by pulsed laser deposition on LaAlO3 (001) substrates. The films were single phase and (001) oriented with a lattice parameter larger than t…
Structurally similar but sequentially unrelated proteins have been discovered and rediscovered by many researchers, using a variety of structure comparison tools. For several pairs of such proteins, existing structural alignments obtained from the literature, as well as alignments prepared using several different simi…
Measurement of the rates of evaporation of amorphous water (a) and ice (i) near 150 K can be interpreted as giving a measure of their free energy difference, ΔaiG (150 K)=1100±100 J/mol, which, together with the known enthalpy difference and heat capacity data, suggests a residual entropy difference of ΔaiS (0)=−0.7±2…
The effects of magnetic field and pressure on the unusual spontaneous behavior of ${\mathrm{La}}_{2/3}$${\mathrm{Ca}}_{1/3}$${\mathrm{MnO}}_{3}$ have been thoroughly investigated. Resistivity and volume thermal expansion, both under magnetic field and pressure, ac susceptibility under pressure, magnetostriction, magne…
Poly(5‐amino‐1‐naphthol) is a new conducting polymer, obtained by electropolymerization of 5‐amino‐1‐naphthol. Raman spectroscopy confirms the structure which consists of amine (‒NH‒C) and imine (‒N=C) links between naphthalene rings, characteristic of a polyaniline‐like structure. Its redox properties were investigat…
The study compares five new intumescent additive mixtures and a carbonizing additive system with the ammonium polyphosphate–pentaerythritol system and additive formulations previously developed in laboratory in terms of fire retardancy of polypropylene-based formulations. The mixture of diammonium pyrophosphate and po…
Transposed temperature drop calorimetry and hightemperature drop solution calorimetry in molten 2PbO·B 2 O 3 at 977 K were used to study the energetics of some manganese oxides, namely pyrolusite (MnO 2 ), bixbyite (Mn 2 O 3 ), hausmannite (Mn 3 O 4 ), and manganosite (MnO). The enthalpies of oxidation at 298 K in the…
We have examined the band gap of a layered B${\mathrm{C}}_{2}$N compound semiconductor. The spectroscopic measurements of scanning tunneling microscopy showed the characteristics of a semiconductor with a band gap energy of 2 eV. The valence band edge measured by x-ray photoelectron spectroscopy was 0.95 eV below the…
In several experiments with soils and mineral phases, extraction of Al (and Fe) by pyrophosphate reagent (0.1 M Na4P2O7, pH 9.5 - 10.5) was tested with regard to its use for the characterization of Al in humus complexes. Results showed that, independent of the soil content of organic C, pyrophosphate reagent removed n…
The shape of a drop centered in an axisymmetric extensional flow is determined by the viscous stresses that deform the drop and surface tension γ′ that resists the deformation. The ratio of these stresses is given by the capillary number, Ca. When Ca is small enough, the drop attains a steady shape. However, above a t…
The electrical conductivity of Sr1−xLaxTiO3 ceramics (x≤0.4) and single crystals (x≤0.1) was investigated in the temperature range between 19 and 1673 K. The mobility was calculated from the carrier concentration, n, which was determined by Hall measurements as well as by a chemical Ti3+ titration. The mobility of the…
Resource‐based physiology of the eight important planktonic diatom species in the large lakes of the Yellowstone region can be used to explain their relative abundances and seasonal changes. The diatoms are ranked along resource ratio gradients according to their relative abilities to grow under limitation by Si, N, P…
In this paper, we report a generalized form for the range parameter governing the pair interaction between soft ellipsoidal particles. For nonequivalent uniaxial particles, we extend the Berne-Pechukas Gaussian overlap formalism to obtain an explicit expression for this range parameter. We confirm that this result is…
Carbon-coated iron, cobalt, and nickel particles were produced by an arc discharge process modified in the geometry of the anode and the flow pattern of helium gas. Field emission scanning electron microscopy shows that the resulting material consists of only carbon-coated metal particles without any nanotubes or othe…
The effects of the dopants, Mg 2+ , Sr 2+ , Sc 3+ , Yb 3+ , Gd 3+ , La 3+ , Ti 4+ , Zr 4+ , Ce 4+ , and Nb 5+ , on the grain boundary mobility of dense Y 2 O 3 have been investigated from 1500° to 1650°C. Parabolic grain growth has been observed in all cases over a grain size from 0.31 to 12.5 μm. Together with atmosp…
The effects of the dopants, Mg 2+ , Ca 2+ , Sr 2+ , Sc 3+ , Yb 3+ , Y 3+ , Gd 3+ , La 3+ , Ti 4+ , Zr 4+ , and Nb 5+ , on the grain boundary mobility of dense CeO 2 have been investigated from 1270° to 1420°C. Parabolic grain growth has been observed in all instances. Together with atmospheric effects, the results sup…