Materials Literature
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The relationship between fatty acid metabolism and PHA biosynthesis in P. putida is described. Detailed 1H and 13C NMR studies were performed to investigate the structures of poly(3-hydroxyalkanoates) (PHAs) formed from carbohydrates and fatty acids. On the basis of these results, it is proposed that during growth on…
solidus in the KMASH system. It is possible to calculate tlire P-T location of this solidus as a function of anro using models for the interactions between HrO and aluminosilicate melts. Using available thermodynamic data, we can also calculate the shift of the subsolidus reaction Phl + Qtz : En * Sa + Fl as a functio…
Free-standing films of the liquid-crystal compound C7 [4-(3-methyl-2-chloropentanoyloxy)-4'-heptyloxybiphenyl], which possesses a first-order smectic-A--smectic-C transition, are studied. In various films with thicknesses between 2 and 27 molecular layers, the average tilt angle, i.e., the order parameter of the trans…
Adding aluminum titanate to alumina can result in dramatic improvements in toughness and R ‐curve properties. However, the improved toughness is offset by a significant reduction in strength at small flaw sizes. This problem can be overcome through the use of a laminated composite construction. By placing a thin layer…
Compounds with extremely branched molecular structures (for example 1) that are formed in iterative syntheses are penetrating many disciplines of chemistry. Compound 1 has 36 carboxyl groups on its periphery and can be considered a unimolecular micelle. Recently dendrimers have found their way into coordination chemis…
Countergravity, pressure-assisted infiltration with a 2014 Al alloy of suitably tamped porous compacts of platelet shaped single crystals of alpha (hexagonal) silicon carbide was used to measure particulate wettability and infiltration kinetics under dynamic conditions relevant to pressure casting of composites. A thr…
In this paper an overview is given on the occurrence of poly(hydroxyalkanoate) (PHA) in cyanobacteria and its possible role as a putative reserve compound. Comparisons are made with the function of other storage compounds that occur in cyanobacteria. For the cyanobacteria Oscillatoria limosa and Gloeothece sp. PCC 690…
The phase diagrams of the binary organic system of benzidine–pyrogallol was determined by the thaw–melt method. The solidification behaviour of the pure components, their eutectics, and the addition compound were studied by measuring the movement of growth front in a capillary. From the data on X-ray diffraction, ther…
Thermal crystallization behavior of ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Te}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ (25\ensuremath{\le}x\ensuremath{\le}60) glasses is studied by differential scanning calorimetry. ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Te}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ glasses with x40 are…
Abstract Simple blends of poly(2,6 dimethyl 1,4‐phenylene ether) (PPE) and polypropylene (PP) are highly incompatible and consequently quite brittle regardless of the molecular weights and ductility of the individual components. Hydrogenated, styrene‐diene block copolymers, viz. S‐EB‐S triblock and S–EP diblock copoly…
Abstract Cannonite, ideally Bi 2 O(OH) 2 SO 4 , is a new mineral from the Tunnel Extension mine, Ohio Mining District, Marysvale, Utah, USA. It occurs mostly as intergrown crystalline aggregates (<1 mm) of subhedral to euhedral equant to prismatic crystals (<200 μm) in cavities in quartz gangue. Other associated…
Epitaxial silicon films are obtained by low temperature chemical vapor deposition on porous silicon layers (PSL). The PSL are formed on lightly and highly boron doped silicon substrates. In the case of lightly doped substrates, the epitaxial films exhibit a large defect density (10 10 cm −2 ). It is shown that this de…
XPS core level and valence band measurements are presented for a twinned LaAlO3(100) crystal.
Abstract We have examined the barium ferrite powder X-ray diffraction patterns in the PDF using experimental and calculated diffractograms. An improved calculated diffractogram is proposed. The result indicates that the primary peak of barium ferrite is not (107) but is (114).
Abstract The influence of growth rate dispersion on the product‐size distribution of batch cooling crystallization is investigated by computer simulations. The model accounts for primary and magma density‐dependent secondary nucleation, and growth rate dispersion of the constant crystal growth type. The model is solve…
Abstract The first band structures and calculated electronic properties of the compounds LaSe and LaTe are reported. The energy band structure of lanthanum monochalcogenides are obtained using the self‐consistent LMTO method within the atomic sphere approximation. The band structure outputs were used to calculate the…
In phase transformation one initial orientation gives rise to several final orientations called crystallographic variants. In this paper it is shown that the number of physically distinct variants depends not only on the lattice symmetry of the initial phase but also on the mutual orientation relations between the lat…
In permanent magnetic materials magnetization reversal does not take place by coherent and global rotation.No collective processes are involved when the energy barrier implicated in the reversal is of magnetocrystalline nature acting at the atomic level.The mechanism by which magnetization reversal occurs involves sev…
Abstract Real‐time x‐ray scattering at elevated temperatures has been used to investigate the thermal expansion characteristics of poly(butylene terephthalate), PBT. Changes in the six lattice parameters of the α‐form of PBT were obtained from wide‐angle x‐ray scattering over the temperature range from 35 to 215°C. Th…
Abstract Crack propagation behaviour in sintered alumina has been observed by in situ straining experiments in a transmission electron microscope at 800°C. Dislocations were generated at the crack tips, and the strain contour line around the crack tips was found to oscillate periodically during crack propagation. Crac…