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Molecular orbital calculations, using the Xa scattered wave method, were done for the clusters MnOl,0-, MnO?-, and MnOB- corresponding to Mn2*, Mn3*, and Mna* in octahedral coordination with O2-. Bond lengths representative of those observed in manganese oxides were chosen and 05 symmetry was used for each cluster. Th…
The bandstructures were calculated by the local-spin-density (LSD) method for the alloys Cu 2 MnAl, Ni 2 MnSn, Pd 2 MnSn, Pd 2 MnSb, Co 2 MnSn, Co 2 TiSn, Co 2 TiAl and Mn 2 VAl. We calculated the magnetic moments and the hyperfine fields for these alloys on the basis of the bandstructures. The peak near the Fermi lev…
Abstract An X-ray diffraction study of aqueous emulsions of a Na-montmorillonite shows that: (1) At low water content, the d-spacings of the montmorillonite increased stepwise with increasing water content; (2) At high water content, sharp (001) peaks due to regular stacking of montmorillonite layers were not detectab…
Abstract The negative surface charge of synthetic allophanes with a range of Si/Al ratios decreased and positive charge increased with increasing alumina content at a given pH. The phosphate adsorption capacity also increased with increasing Al content. That this relationship between composition and chemical reactivit…
This paper reviews the present status and art of liquid crystal displays. It discusses the fabrication and operational principles of dynamic scattering, twisted nematic, guest-host, dye phase change, tunable birefingence, thermally addressed smectic A mode, etc, displays. The potentialities of applications of these di…
We used first-order, Elovich, parabolic diffusion, and zero-order equations to describe the kinetics of K-Ca exchange in kaolinite, montmorillonite, vermiculite and soils of the Atlantic Coastal Plain Region. The first-order equation was the best of the various kinetic equations studied to describe the reaction rate o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystal phase transitions in a solution of rodlike and disklike particlesA. Stroobants and H. N. W. LekkerkerkerCite this: J. Phys. Chem. 1984, 88, 16, 3669–3674Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1 Au…
A single-stage computer procedure to calculate an electron density map suitable to detect errors in a tentative macromolecular model has been developed. In this procedure, an atom of the tentative model does not contribute to the phases used to calculate electron density values at or near its current position, that is…
"Transmission Electron Microscopy. Physics of Image Formation and Microanalysis." Optica Acta: International Journal of Optics, 31(8), p. 848
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and photochemical reduction of decatungstate: a reinvestigationA. Chemseddine, C. Sanchez, J. Livage, J. P. Launay, and M. FournierCite this: Inorg. Chem. 1984, 23, 17, 2609–2613Publication Date (Print):August 1, 1984Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical properties of hydroxypropyl cellulose liquid crystals. I. Cholesteric pitch and polymer concentrationR. S. Werbowyj and Derek G. GrayCite this: Macromolecules 1984, 17, 8, 1512–1520Publication Date (Print):August 1, 1984Publication History Published online1 May 2002P…
This article reviews published data on the mechanical properties of additively manufactured metallic materials. The additive manufacturing techniques utilized to generate samples covered in this review include powder bed fusion (e.g., EBM, SLM, DMLS) and ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectromagnetic model for surface-enhanced Raman scattering (SERS) on metal colloidsMilton KerkerCite this: Acc. Chem. Res. 1984, 17, 8, 271–277Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1 August 1984https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of water-soluble porphyrins: comparative study of isomeric tetrapyridyl- and tetrakis(N-methylpyridiniumyl)porphyrinsK. KalyanasundaramCite this: Inorg. Chem. 1984, 23, 16, 2453–2459Publication Date (Print):August 1, 1984Publication History Published online1 M…
Abstract The curing reaction of a commercial bisphenol A diglycidyl ether (BADGE) with ethylenediamine (EDA) was studied by differential scanning calorimetry. Different kinetic expressions were found with isothermal (low temperature range) and dynamic (high temperature range) runs. Two competitive mechanisms are shown…
Silicon carbide ceramics containing up to 24.6 vol% dispersed TiC particles yielded fully dense composites by hot‐pressing at 2000°C with 1 wt% Al and 1 wt% C added. The micro‐structure consists of fine TiC particles in a fine‐grained SiC matrix. Addition of TiC particles increases the critical fracture toughness of S…
The finite element method is a well-established method for the solution of a wide range of guided wave problems. One drawback associated with the powerful vector formulation is the appearance of spurious or nonphysical solutions. A penalty function method has been introduced to the finite element formulation, to reduc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReinterpretation of polypyrrole electrochemistry. Consideration of capacitive currents in redox switching of conducting polymersStephen W. FeldbergCite this: J. Am. Chem. Soc. 1984, 106, 17, 4671–4674Publication Date (Print):August 1, 1984Publication History Published online…
This paper describes the use of quantitative mineralogy and specific surface area in interpreting the index properties of clayey soils from nine sites in Eastern Canada. Samples representative of the Tyrrell, Laflamme, Champlain, and Goldthwait marine seas and Lac Barlow–Ojibway have been studied.Quantitative X-ray di…
High-resolution measurements of the cubic refractive index $n$ ($700 \mathrm{K}<T<1000 \mathrm{K}$) and of the tetragonal and orthorhombic birefringence $\ensuremath{\Delta}n$ ($480 \mathrm{K}<T<705 \mathrm{K}$ and $300 \mathrm{K}<T<490 \mathrm{K}$, respectively) are performed on ${\mathrm{KNbO}}_{3}…