Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTest of the reptation concept: crystal growth rate as a function of molecular weight in polyethylene crystallized from the meltJohn D. Hoffman and Robert L. MillerCite this: Macromolecules 1988, 21, 10, 3038–3051Publication Date (Print):October 1, 1988Publication History Pub…
Phase relationships in the SiC‐AlN system were determined by analytical electron microscopy of local equilibria among adjacent phases in hot‐pressed samples and in diffusion couples. At 2100° to 2300°C, a 4H–2H equilibrium exists, the 4H field extending from ∼2 mol% AlN to an upper limit of 11 to 14 mol% AlN. The wurt…
The corrosion potential of AISI(1) 316 stainless steel (SS) and the oxygen reduction rate, as measured by the cathodic polarization curve, have been determined with and without the formation of a natural marine bacterial film on the surface. The data show that the amount of scatter in the corrosion potential increases…
Colloidal dispersions of uniform spherical particles of yttrium basic carbonate and rodlike particles of yttrium ammine carbonate were prepared by aging at elevated temperatures yttrium salt solutions in the presence of urea. Different composition and morphology were achieved by altering the aging temperature and time…
Abstract Thermal analysis was performed on poly(butylene terephthalate), PBT, between 210 and 560 K. By combination of experimental heat capacities with computations with an approximate frequency spectrum of 65 group and 19 skeletal vibrations, preliminary recommended ATHAS (1988) heat capacities are proposed for the…
In this paper, single crystals of Li 13 Nd(GeO 4 ) 4 are grown by the Czochralski method. The unit cell dimensions and the crystal system are determined by an X-ray diffraction method. The principal refractive indices, n a , n b and n c and the temperature dependence of birefringences, n c - n b , n c - n a and n a -…
Current understanding of different phases as well as the phase transitions between them has only been achieved following recent theoretical advances on the effects of dimensionality in statistical physics. P S Pershan explains the connection between these two separate areas and gives some examples of problems where th…
A convolutive profile-fitting procedure is described for analysing X-ray diffraction peak profiles broadened by microstructural factors (crystallite size and lattice disorder). The method requires, in a first stage, an accurate determination of the instrumental function, which is subsequently convoluted with a paramet…
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 homogeneous (single-cluster) and inhomogeneous contributions to the low temperature electronic absorption spectrum of 35–50 Å diameter CdSe clusters are separated using transient photophysical hole burning. The clusters have the cubic bulk crystal structure, but their electronic states are strongly quantum confine…
To survive and proliferate in pure culture, human melanocytes require basic fibroblast growth factor (bFGF) and cAMP. Without these factors, even in the presence of serum, the cells die. Melanocytes cultured in the presence of keratinocytes, however, survive for weeks without added bFGF and cAMP. We show here that the…
Measurements of the pit nucleation potential and the induction time for pit initiation under open circuit conditions were made for AISI(1) 304 solution-annealed stainless steel (SS) specimens upon exposure to aerated solutions with different Cl– concentrations at temperatures ranging from 20 to 200 C. For comparison,…
Abstract The metallic and the oxide states of Mo were analysed by ESCA. A pure Mo metal sample was ion‐etched and analysed. MoO 3 was formed by oxidation of Mo in oxygen. The four‐valent MoO 2 was prepared by oxidation of Mo in a H 2 O/H 2 gas mixture and by reduction of MoO 3 in hydrogen. The binding energies of the…
Interfacial tensions between immiscible homopolymers are measured using an automated pendant drop apparatus, which utilizes Video Digital Image Processing techniques. A recently developed robust shape analysis algorithm is used to analyze the experimental drop profiles. The data show the effect of temperature and numb…
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