A Molybdate Treatment for Enhancing the Passivity of Aluminum in Chloride‐Containing Environments
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Cardiac glycosides and pregnanes from Adenium obesum (Studies on the constituents of Adenium. I).
Cardiac glycosides and pregnanes from the roots and the stems of Adenium obesum Roem. et Schult. were investigated. Among 30 cardiac glycosides including 15 known glycosides and 15 new combinations of the known aglycones and sugars, the structures of 11 glycosides were elucidated. Oleandrigenin beta-gentiobiosyl-beta-…
Displacive transformations and quasicrystalline symmetries
The property, for quasiperiodic structures built by the cut and project or any equivalent method, to be related to a periodic lattice by a bounded deformation is a strong restriction on the window defining the strip, or on the atomic surface. We give a sufficient condition (which is also necessary in one dimension) fo…
The Effect of Superficial Hydration on the Mechanical Properties of Human Skin in Vivo
The influence of topically applied tap water on the mechanical properties of human skin was studied in vivo by applying tap water to the ventral aspect of the forearms of 18 healthy volunteers for 10 or 20 minutes and then measuring distensibility, elastic retraction, and hysteresis. Significant increases in distensib…
Infrared spectroscopic surface characterization of zirconium oxide. Part 3.—The CO/CO 2 and CO/H 2 O interactions at the surface of a high-area monoclinic preparation
Carbon monoxide adsorbs at ambient temperature on microcrystalline monoclinic ZrO2, vacuum activated at 100–600°C, yielding two reversible σ-coordinated species, whose spectral positions depend linearly on the overall CO coverage, and whose frequencies at zero CO coverage depend on the residual surface concentration o…
Miscibility of copolymer blends
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility of copolymer blendsK. J. Zhu, S. F. Chen, Tai Ho, Eli M. Pearce, and T. K. KweiCite this: Macromolecules 1990, 23, 1, 150–154Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 January 1990https://pubs.acs.org…
PRACTICAL GUIDE TO USING DUPLEX STAINLESS STEELS
Duplex stainless steels are defined and the advantages of second-generation, nitrogen-alloyed grades are explained. Information is provided on duplex stainless steel metallurgy, pitting and crevice corrosion resistance, stress corrosion cracking resistance, specifications, mechanical properties, fabrication procedures…
High-coercivity Nd-Fe-B-type permanent magnets with less dysprosium
The effects of V or Mo addition on the microstructure and magnetic properties of Nd-Dy-Fe-Co-B sintered magnets were studied experimentally. It is shown that these additives increase the intrinsic coercivity of cobalt-containing Nd-Fe-B-type sintered magnets, serving to reduce the amount of Dy required for thermal sta…
The influence of stress on ferromagnetic hysteresis
It is argued that attempts to describe the stress magnetization behavior of ferromagnetic materials have, in general, relied upon unsubstantiated assumptions regarding the distribution of domains and the relative motion of domain walls under the combined influences of applied field and mechanical stress. An empirical…
Analysis of variable-voltage thyristor controlled induction motors
A full analysis is presented of the steady-state performance of a variable-voltage thyristor controlled induction motor system, based on the representation of the rotor as a sinusoidal EMF in series with a resistance-inductance circuit. In the development of this circuit, magnetising current and stator resistance are…
Nematic to isotropic transition in chemically disordered or multicomponent liquid-crystalline polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNematic to isotropic transition in chemically disordered or multicomponent liquid-crystalline polymersGlenn H. Fredrickson and Ludwik LeiblerCite this: Macromolecules 1990, 23, 2, 531–539Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Pu…
Composite rod insulators for AC power lines: electrical performance of various designs at a coastal testing station
The electrical performance of 36 composite insulators comprised of four commercial types for each AC-system level of 34.5 kV, 230 kV, and 500 kV is determined. The weathershed materials are epoxy-resin, ethylene propylene rubber and silicone rubber; half of the 230 kV insulators had no stress rings. Surface leakage cu…
Spectroscopy and electrical conductivity of [Au(C 3 S 5 ) 2 ] n– and [Au(C 3 Se 5 ) 2 ] n– (n= 0–1) complexes and X-ray crystal structure of [NBu n 4 ][Au(C 3 S 5 ) 2 ]
The complexes [NBun4][Au(C3S5)2][C3S52–= 4,5-dimercapto-1,3-dithiole-2-thionate(2–)] and [NBun4][Au(C3Se5)2][C3Se52–= 4,5-di(hydroseleno)-1,3-diselenole-2-selonate(2–)] were prepared. Oxidation reactions of these complexes with iodine, [ttf]3[BF4]2(ttf˙+= the tetrathiafulvalenium radical cation), and [Fe(cp)2][PF6](cp…
Curve fitting methods for quantitative analysis in electron energy loss spectroscopy
A novel approach to the determination of elemental concentrations in solids by Electron Energy Loss Spectroscopy (EELS) is presented. The method uses calculated values of the inner-shell excitation cross-sections and standard assumptions about the form of the background, to model the spectrum before and after an excit…
A Study of the Photochromic and Electrochromic Properties of MoO3 Thin Films
Abstract The photochromic and electrochromic responses of MoO 3 thin films subjecting to UV irradiation were investigated in different environments. It was found that photochromic responses were different in different chemical environments. The presence of oxygen had a detrimental effect on the photochromic responses…
Metachromasy in clay minerals. Spectroscopic study of the adsorption of crystal violet by laponite
The adsorption of crystal violet (CV) on laponite has been investigated by normal and comparative electronic spectroscopy. The following spectroscopic phenomena have been observed: with degrees of saturation below 44 mmol CV per 100 g clay, band α showed a bathochromic shift, indicating the adsorption of monomeric CV…
Ion adsorption and equilibrium distribution of charges in a cell of finite thickness
By using a self-consistent method the equilibrium distribution of charges in a liquid cell of finite thickness, when the adsorption phenomenon is present, is evaluated. The analysis is performed for the two limiting cases where the neutral density is fixed : either very weak (total dissociation), or very large (weak d…
Application of the pseudophase ion-exchange model to kinetics in microemulsions of anionic detergents
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of the pseudophase ion-exchange model to kinetics in microemulsions of anionic detergentsRicardo da Rocha. Pereira, Dino. Zanette, and Faruk. NomeCite this: J. Phys. Chem. 1990, 94, 1, 356–361Publication Date (Print):January 1, 1990Publication History Published o…
POTASSIUM SORBATE PERMEABILITY of POLYSACCHARIDE FILMS: CHITOSAN, METHYLCELLULOSE and HYDROXYPROPYL METHYLCELLULOSE
ABSTRACT Edible coatings controlling preservative migration from surface to food bulk could control surface microbial growth which is often the main cause of spoilage for many food products. In this paper we examine the potassium sorbate permeability behavior of chitosan, methyl cellulose and hydroxypropyl methyl cell…
A kinetic and microscopic investigation of the thermal dehydration of lithium sulphate monohydrate
Lithium sulphate monohydrate loses its water of crystallization in a single rate process Li2SO4· H2O → Li2SO4+ H2O. Scanning electron microscopic studies confirm that this nucleation and growth reaction is completed without melting. During the initiation of reaction there is dense nucleation, and nuclei rapidly coales…