Materials Literature
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The screening effects in fluid phases of charged particles give rise to a variety of exact sum rules for their correlation functions. Some of them have been known for a long time, while others have been derived more recently---in particular, for nonuniform fluids. A presentation of these sum rules for static and time-…
The 27 Al and 29 Si magic‐angle spinning nuclear magnetic resonance (MAS‐NMR) study of the kaolinite‐mullite transformation has shown the presence of Al in tetra‐ and pentacoordination in dehydroxylated kaolinite. The 29 Si NMR signal analysis of samples heated above 400°C demonstrates that the tetrahedral sheet of ka…
A general method for computing the hydrodynamic interactions among an infinite suspension of particles, under the condition of vanishingly small particle Reynolds number, is presented. The method follows the procedure developed by O'Brien (1979) for constructing absolutely convergent expressions for particle interacti…
The poly-beta-hydroxybutyrate (PHB) biosynthetic pathway from Alcaligenes eutrophus H16 has been cloned and expressed in Escherichia coli. Initially, an A. eutrophus H16 genomic library was constructed by using cosmid pVK102, and cosmid clones that encoded the PHB biosynthetic pathway were sought by assaying for the f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotolabile 1-(2-nitrophenyl)ethyl phosphate esters of adenine nucleotide analogs. Synthesis and mechanism of photolysisJeffery W. Walker, Gordon P. Reid, James A. McCray, and David R. TrenthamCite this: J. Am. Chem. Soc. 1988, 110, 21, 7170–7177Publication Date (Print):Octo…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Some of the physical and chemical properties of electrochemically grown polyaniline (PA) films have been studied and results are reported. Physical properties determined include the density of PA sulfate (1.5 g/cm 3 ), empirical equations relating the film thickness with electrical charges measured during the film gro…
This text provides an up-to-date coverage of the theoretical and experimental tools required for fundamental studies of point defects, with illustrative examples from a wide range of inorganic materials. On the experimental side a strong emphasis is placed on the powerful resonance and hyperfine methods which give det…
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Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The discrete dipole approximation (DDA), a flexible method for computing scattering of radiation by particles of arbitrary shape, is extended to incorporate the effects of radiative reaction and to allow for possible anisotropy of the dielectric tensor of the material. Formulas are given for the evaluation of extincti…
In many materials with a highly anisotropic band structure, electron-phonon interactions lead to a novel type of ground state called the charge-density wave. The condensate is pinned to the underlying lattice by impurities and by boundary effects, but can, even for small electric fields, carry current in a fashion ori…
For pt.I see ibid., vol.21, p.4795 (1988). Optical absorption spectra under magnetic field and uniaxial stress in (NH 3 (CH 2 ) n NH 3 )MnCl 4 (n=2, 3, 4, 5) were analysed within the framework of a ligand-field approximation. All of the lines that appeared at low temperature are magnon-assisted transitions, and they m…
Optical absorption spectra in the quasi-two-dimensional antiferromagnet (NH 3 (CH 2 ) n NH 3 )MnCl 4 (n=2, 3, 4, 5) were investigated. In the transitions 6 A 1g (S) to 4 A 1g (G), 4 E g (G), 4 T 2g (D), 4 E g (D) and 4 T 1g (P), much fine structure caused by electric dipole transition appeared at low temperature. It w…
Structure factors of dilute binary colloidal suspensions of various compositions, particle diameter ratios and ionic impurity concentrations are investigated using polarised light scattering. For the first time, a split in the second peak of the measured structure factor is observed, suggesting the existence of glass-…
Optical third-harmonic generation was used to measure third-order nonlinear susceptibilities χ(3) for thin films of planar zigzag polysilanes and polygermanes. A χ(3) of 11.3×10−12 esu was measured, the largest value ever reported for a polymer with transparency throughout the visible. The value of χ(3) was found to v…
Abstract Electron diffraction and high-resolution transmission electron microscopy indicate that the radial segments composing coccoliths of the marine alga Emiliania huxleyi are individual single crystalline units of calcite. The top and bottom surfaces of the plate-like lower element correspond to the (12̄10) and (1…
Abstract Mother-of-pearl (nacre) is a platelet-reinforced composite, highly filled with calcium carbonate (aragonite). The Young modulus, determined from beams of a span-to-depth ratio of no less than 15 (a necessary precaution), is of the order of 70 GPa (dry) and 60 GPa (wet), much higher than previously recorded va…
The author considers a quantum Ising model where the exchange couplings and the transverse fields follow a quasiperiodic two-valued sequence. The model is shown to exhibit an Ising-like critical point. The spectrum of the critical Hamiltonian is in accordance with the predictions of conformal theory.
Abstract The effect of several additives such as CaC 2 , CaO, Y 2 O 3 , and C on the thermal conductivity of hot‐pressed AlN ceramics is studied.