Materials Literature
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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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of spin-state interconversion in iron(II) complexes in solution as a function of pressure: activation volumes for the 1A1 .dblharw. 5T2 spin changeJohn J. McGarvey, Ian Lawthers, Karel Heremans, and Hans ToftlundCite this: Inorg. Chem. 1990, 29, 2, 252–256Publicatio…
Abstract Graft copolymerization of water soluble vinyl monomers such as acrylic acid and acrylamide onto isotactic polypropylene by the pre‐irradiation method has been studied. Grafting was carried out in a water and water‐methanol solvent system. The percentage of grafting has been determined as a function of (i), to…
Abstract A new photochromic spiro[3H-1,4-oxazine] 4 is described. The absorption spectra of 4 have been examined and compared with those of spiro[indoline-naphthoxazine] 1. The colored form of 4 has the absorption maximum shorter than that of 1. Compound 4 showed excellent light fatigue-resistant property.
A method is described for measuring the water vapor resistance of textiles under variable conditions of relative humidity (RH). It consists basically of varying the position of the sample in an air gap between a wet and a dry surface while keeping all other conditions constant. The resistance is determined by the rate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinucleating, macrocyclic [14]N4 ligands and their complexes. Synthesis of the free ligand 2,3-dioxo-5,6:13,14-dibenzo-9,10-(4',5'-dimethylbenzo)-1,4,8,11-tetraazacyclotetradeca-7,11-diene (L) and of the 7,12-Me2-L metal complexes and derivatives. Crystal structures and prop…
With the use of some obstacle rings and a set of retarding grids, the resolution of the prototype spherical mirror analyzer, which has been developed in a previous paper [H. Daimon, Rev. Sci. Instrum. 59, 545 (1988)], was improved. The uniformity of the resolution with respect to the emission angle was also achieved.…
Using x-ray photoelectron spectroscopy (XPS), the interaction of sodium molybdate with Al was studied under a number of different conditions, including variations on molybdate concentration, pH, and applied potential. By comparison with a database of Mo binding energies, the results show several different oxidation st…
The magnetotransport properties of ${\mathrm{NbSe}}_{3}$ in the temperature range below the second charge-density-wave (CDW) onset of 59 K have been studied in magnetic fields up to 230 kG. At liquid-helium temperatures giant magnetoquantum oscillations caused by magnetic breakdown (MB) between the normal Fermi surfac…