Materials Literature
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We construct a theory of velocity selection and tip stability for dendritic growth in the local evolution model. We show that the growth rate of dendritic patterns is determined by a nonlinear solvability condition for a translating finger. The sidebranching instability is related to a single discrete oscillatory mode…
Conductivity, thermoelectric power, spin concentration and spin dynamics has been measured in polyaniline samples equilibrated at different pH. Data provide evidence for Metal-Insulator transition upon pH variation.
The interaction of carbon monoxide and submonolayer coverages of potassium on Ru(001) has been investigated with high resolution electron energy loss spectroscopy, LEED, Auger electron spectroscopy, thermal desorption, and work function measurements. The adsorption of potassium on ruthenium at submonolayer coverages (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeuterium isotope effects on the ligand field excited-state kinetics of hexaamminerhodium(III)Mark E. Frink and Peter C. FordCite this: Inorg. Chem. 1985, 24, 7, 1033–1035Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1…
Measurements of the physical properties of 1-octadecylamine were carried out in a temperature range of 30 to 120°C. The melting point of the compound was observed at 55°C and no liquid crystalline phase was found within this temperature range. The decomposition point of the carbonate of this amine was found to be a li…
The Stage I work-hardening behaviour of disordered Cu3Au single crystals containing volume fractions, f, of SiO2 particles equalling 0·005 and 0·01, oriented for single slip on (111)[101], was studied in compression at 77 K and 295 K. At 295 K, Lüders-band propagation was found to obscure the work-hardening behaviour…
The variation with water content of dc conductivity and Na diffusion coefficient for the Na 2 O · 4siO 2 and Na 2 O · 2SiO 2 glass systems was found to be similar to that of the Na 2 O.3SiO 2 series reported earlier. The conductivity was estimated for the ternary system Na 2 O‐H 2 O‐SiO 2 by combining the present resu…
The characteristics and mechanisms for the adsorption of iodine from aqueous solutions or from organic solvents on activated carbon were studied. Most adsorption terminated in 24 h, but a very slow adsorption was observed even after 2 d for aqueous solutions. It was found that the adsorbed species could be quantitativ…
SUMMARY The recuperation of the soil during bush fallows after a period of cultivation is an important part of the success of shifting cultivation in the lowland humid tropics. However, the sources of the nutrients which enable the observed rapid growth on apparently exhausted soils has never been satisfactorily expla…
Abstract Picosecond transient Spectroscopy has been used to measure excited state lifetimes ancfrspectra of Cr, Mn, Fe, Sn and Pb meso‐tetraphenylporphyrins. Excited state spectra are typical of π,π * states, and lifetimes vary from > 20 ns in Cr(III) tetraphenylporphyrin to 8 ps in Mn(II). This contrasting behavio…
Abstract Secondary cartilage forms on avian and mammalian dermal bones, both during normal ontogeny and during repair of fractures, but it has not been observed in any other vertebrate class. We fractured the left lower jaws of adult spotted salamanders, Ambystoma maculatum , to see whether secondary cartilage would f…
Abstract Fourier‐transform infrared measurements on atactic polystyrene have been made during application of strain. On passing through the yield point, spectra indicate an increase of the amount of the higher‐energy gauche conformation corresponding to the conformational distribution observed at 30°C above the glass…
DEVELOPMENTAL DYNAMICS provides a focus for communication among developmental biologists who study the progressive and dynamic emergence of form and function during embryonic development. The journal is an international forum for the exchange of novel and substantive information on mechanisms that control development.…
Cavitation damage tests in polymer solutions are made with a vibratory cavitation apparatus. It is possible for this device to suppress the degradation of polymer by ultrasonic cavitation. Polymer solutions used are 100 wppm, 500 wppm, and 1000 wppm solutions of Polyox. The weight loss in 100 wppm Polyox solution is l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface pressure from block copolymers with one block forming a monolayer and the other block dangling in solutionSteve Granick and Jean HerzCite this: Macromolecules 1985, 18, 3, 460–465Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Publ…
Electrolytic corrosion of suspension insulator hardware is a wellknown problem with HVDC lines. The development of sacrificial zinc sleeved insulators to minimize these problems and the in-service experience with them is described. This experience is based mainly on the operation of the ±250-kV HVDC transmission line…
Abstract. Natural acidification processes result in increasing solubility of aluminium as soils become more acid. Exchangeable aluminium provides a large reserve that can be mobilized by percolating acids or salts, with solution pH determining the upper limit of its solubility. Aluminium can also be mobilized within s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the dynamics of photostimulated conformational changes of polystyrene with pendant azobenzene groups in solutionMasahiro Irie and Wolfram SchnabelCite this: Macromolecules 1985, 18, 3, 394–398Publication Date (Print):March 1, 1985Publication History Published online1 May…
The fine structure of the shell and underlying mantle in young juveniles of the articulate brachiopod Terebratalia transversa has been examined by electron microscopy. The first shell produced by the mantle consists of a nonhinged protegulum that lacks concentric growth lines. The protegulum is secreted within a day a…
Polycrystalline TiB 2 specimens of 3 μm average grain size but free of lamellar precipitates were compression‐tested to 1900°C and 500 MPa. No plastic yielding was detected. Under such conditions, most other structural ceramics do exhibit yield behavior. The results suggest the existence of a high Peierls stress, pres…