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The first part of this paper reports an experimental investigation of some parameters that control the occurrence of biologically effective cavitation-type phenomena in the frequency region 0.25 4 MHz. The experimental criterion by which “cavitation” is recognized here is the simultaneous occurrence of degradation of…
Research on catalyst deactivation has been concerned with three generally distinguishable areas: (1) investigation of the fundamental mechanisms and the kinetics of deactivation processes, (2) determination of deactivation rates in particulate catalysts, and (3) study of deactivation effects on the operation of real r…
Abstract The rare earth metal dihydrides may be divided into three groups based on their crystal structures. 1. La through Nd dihydrides all have the fluorite structure and form solid solutions with hydrogen up to the composition MH 3. 2. Sm through Lu (excluding Eu and Yb) dihydrides also have fluorite structures but…
Triglycine sulphate crystals have been grown with 10-20 times higher L-alanine substitution than those reported pre-viously. The present crystals contain up to 2% L-alanine, show internal bias fields in excess of 80 kV cm-1 and have severely depressed dielectric peaks occurring at up to 62°C. The results show an equiv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChromatographic peak shapes. Their origin and dependence on the experimental parametersEli GrushkaCite this: J. Phys. Chem. 1972, 76, 18, 2586–2593Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972https://pubs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect evidence from carbon-13 nuclear magnetic resonance for intramolecular scrambling of carbonyl groups in a metal atom cluster carbonyl, tetrarhodium dodecacarbonylF. A. Cotton, L. Kruczynski, B. L. Shapiro, and L. F. JohnsonCite this: J. Am. Chem. Soc. 1972, 94, 17, 619…
In this paper we examine how the joint strength of lap joints containing a brittle adhesive may be affected by partial removal of adhesive from the bonded area. It is found that the shear strength in tension of a lap joint specimen is governed essentially by the leading edges of the joint and not by the bonded area.
Transmission electron microscopy and immersion density techniques were used to characterize the nature and extent of radiation damage in zone refined and commercial purity magnesium irradiated to 1.7 × 1021 neutrons/cm2 (>0.1 MeV) at about 75°C. Swelling from radiation-induced voids was 1.9 and 0.7 per cent, respectiv…
Abstract A study of the mineralogical changes taking place during the loss of interlayer water in an halloysite has been carried out in order to clarify the relationship between the most hydrated and least hydrated states of the mineral. A number of samples of halloysite which together exhibit a variety of average int…
Advances in machine learning have impacted myriad areas of materials science, such as the discovery of novel materials and the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this ...Read More
The effect of stabilizing the properties of piezoelectric Pb(ZrTi)O3-ceramics by addition of the oxides of Mn, Cr or U is studied. Some ordering of the polarization is found to be preserved after heating the material above the Curie temperature. A model for the mechanism is presented, the basic idea of which is the tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDrop Breakup in Simple Shear Fields of Viscoleastic FluidsRaymond W. FlumerfeltCite this: Ind. Eng. Chem. Fundamen. 1972, 11, 3, 312–318Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972https://pubs.acs.org/do…
Diffusion of 63Ni in polycrystalline α-Ti and of 59Fe, 60Co and 63Ni in α-Zr has been measured. In α-Zr, single crystals were used for studies of Ni and Go diffusion, while the experiments on Fe diffusion were done on polycrystalline specimens. All the solutes studied exhibited extremely fast diffusion compared to sel…
Abstract A smectite rich in ferrous iron and low in aluminum occurs abundantly in the Red Sea Geothermal Deposits, and appear to be forming at present. Chemical analyses and Mössbauer spectra indicate the mineral is intermediate in composition between nontronite and the as yet undescribed trioctahedral ferrous iron en…
Abstract Published measurements of the diffusion of hydrogen in fcc metals are summarized with particular emphasis on the isotope effect. The observations are generally consistent with the usual rate theory model but with the energy levels in both the equilibrium site and the saddle point quantized according to an Ein…
Abstract The relative amounts of the α and the γ crystalline forms of nylon 6 obtained from the melt under different crystallization conditions have been studied by an x‐ray diffraction procedure by comparison with a calibration curve obtained from the diffraction of standard samples. The weight fraction of the α form…
Optical constants have been obtained for glassy carbon from 0 to 82 eV by means of reflection measurements. The data have been analyzed by analogy with those for graphite in terms of single electron excitations and of collective oscillations of the π and σ electrons.
Nonisothermal techniques for analyzing initial‐stage sintering are reviewed. It is shown that in principle they permit the determination of all the sintering parameters (rate law, activation energy, and diffusion coefficients) normally obtained from isothermal experiments. Comparison with results from isothermal exper…
Stoichiometric NiAl 2 O 4 , CuAl 2 O 4 , and ZnAl 2 O 4 spinels were prepared and equilibrated at temperatures from 600° to 1400°C. The parameters u and x , denoting the oxygen position and fraction of divalent cations on tetrahedral sites, respectively, were determined from a detailed X‐ray diffraction analysis. In N…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropoly and isopoly anions as oxo complexes and their reducibility to mixed-valence bluesMichael T. PopeCite this: Inorg. Chem. 1972, 11, 8, 1973–1974Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972https:…