Materials Literature
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Four of the problems deal with the mechanics of bubble production and bursting, and the collection and sizing of jet drops; three concern the transfer of the bacterium Serratia marcescens from bursting bubbles to jet drops. The problem of producing bubbles of a specified size from glass capillary tips is overcome by p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntersystem crossing observed by ultrasonic relaxation of the singlet-quintet spin equilibrium of iron(II) complexes in solutionJames K. Beattie, Robert A. Binstead, and Robert J. WestCite this: J. Am. Chem. Soc. 1978, 100, 10, 3044–3050Publication Date (Print):May 1, 1978Pu…
Abstract The complexation of homogeneous polyethylene glycols and their dimethyl ethers(glymes) with alkali and alkaline-earth metal cations was studied by PMR spectroscopy on the basis of a comparison with crown ethers. The ethylene proton signal of octaethylene glycol in methanol-d4 was split into three lines by the…
Abstract Filaments of polypropylene having remarkably high strength and modulus have been prepared by the two‐stage drawing process of Clark and Scott (4). In the first stage, un‐oriented extruded billet is rapidly drawn to the natural draw ratio of ca 7X in hot silicone oil. The second stage of draw, a post neck draw…
Abstract Using the cluster approximation, a detailed semi‐empirical molecular orbital calculation is reported for computing the energy levels of Cu + luminescent centres in NaCl and LiCl. Excited states energies are obtained on the basis of 3d 9 4s configuration of Cu + , including spin–orbit interaction. Excitation a…
Abstract The electrodic polymerization on graphite fibers of a variety of monomers having different types of functional groups has been investigated. In addition to vinyl polymerization, some novel polymerizations of cyclic functional groups have been conducted under appropriate polymerization conditions. In many inst…
Results of high resolution secondary electron observations of the haemocyanin molecule from the marine whelk Buccinum undatum are given. The choice of metal used for surface coating of the sample (gold, gold--palladium or carbon/gold--palldium) and the mode of application of this metal (thermal vacuum evaporation or d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular orbital study of the vibrational frequencies and resonance Raman intensities of biphenyl negative ionsSatoshi Yamaguchi, Nobuaki Yoshimizu, and Shiro MaedaCite this: J. Phys. Chem. 1978, 82, 9, 1078–1080Publication Date (Print):May 1, 1978Publication History Publis…
Yutaka Tokiwa, Tomoo Suzuki; Hydrolysis of Polyesters by Rhizopus delemar Lipase, Agricultural and Biological Chemistry, Volume 42, Issue 5, 1 May 1978, Pa
SUMMARY The analytic solution for the model of electron beam heating a moderately thick STEM/SEM specimen was used to calculate the steady state temperature profiles developed in the bulk of the specimen. For thin specimens one maximum in the temperature profile was found near the surface. The location of this maximum…
We have studied a Landau theory for charge-density waves keeping terms up to sixth order in the free-energy expansion. Even with amplitude modulation, the lock-in transition remains continuous. We construct a phase diagram with three phases: normal, incommensurate, and commensurate meeting at a triple point. With no s…
As part of a study to understand the influence of gravity, cooling rate, and composition on the structure of liquid-phase immiscible materials, two alloys, AI-40 wt% In and Ai-70 wt% In, were treated thermally on the SPAR II rocket flight. The treatments involved homogenization at a temperature above the miscibility g…
The deuterium permeation through several copper alloys has been measured over a temperature range of 550 to 830 K using the membrane technique. In some cases, the hydrogen permeability was also measured. The results were divided into three categories: common alloys, gold alloys, and stable oxide forming alloys. Common…
The incommensurate (I) state of the triple charge-density-wave (CDW) in 2H–TaSe 2 is studied on the basis of McMillan's phenomenological free energy. A sufficiently large number of harmonics is taken into account to describe the I state precisely. Model calculations based on this theory predict the first-order incomme…
Single crystals of 3-percent Si-Fe with near
Focusing properties and aberration coefficients are calculated for electrostatic einzel lenses suitable for use as preaccelerator lenses in field-emission electron guns. Various lens shapes are analyzed, and asymmetric designs with conical central electrodes are found to have reduced spherical aberration. A lens shape…
Tritium diffusion coefficients and deuterium solubilities were measured for silicon carbide. At 500° to 1300° C, measured tritium diffusion coefficients were much lower than the recorded values for metals, whereas the activation energies for diffusion were much higher (30 to 75 kcal/mol). The solubility of deuterium i…
Abstract It was shown that some block copolymers and their blends with corresponding homopolymers exhibit stress softening. When the specimens are stretched beyond the yield point, they become rubbery and exhibit high elasticity and large recoverable deformation, as a result of a breakup of their original rigid struct…
The relative intensities of the transitions occurring in the fluorescence spectrum of KY3F10: 1% Eu have been measured at 77 and 4 K. By using the computed eigenfunctions for each Stark level, the Judd–Ofelt theory is used for calculations of the electric dipole intensities. The nine phenomenological parameters allowe…
An experimental study has been made of the interrelation of grain boundary sliding, crystal deformation and intergranular fracture during creep of copper bicrystals. The observed sliding behaviour was analysed on the basis of the movement of lattice dislocations along the grain boundary. The results show that grain bo…