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Abstract Wave‐vector ( q )‐dependent energy loss functions, Im [−ϵ ⟂ (ω, q ⟂ )] −1 , and dielectric functions, ϵ 2⟂ (ω, q ⟂ ), of hexagonal boron nitride and graphite up to q ⟂ ‐values of almost one third of the Brillouin zone and up to energies of 40 eV were derived from electron energy loss measurements. The results…
A method for precise determination of the orientation of mierocrystals is described. Electron back-scattering patterns are observed on a fluorescent screen in a scanning electron microscope, and high precision is obtained by casting geo metrical shadows onto the screen to determine the point from which the back-scatte…
The concentration of ionic species in the solution in contact with hydrating tricalcium silicate (C 3 S) has been studied as a function of time and in the presence of admixtures. The ionic product for calcium hydroxide (CH) was calculated as a function of time and correlated with calorimetric measurements and crystal…
On the basis of the special symmetry of the rare-earth site in the Laves-phase cubic compounds $R{T}_{2}$ ($R$ is a rare earth, $T=\mathrm{Fe}, \mathrm{Co}, \mathrm{Ni}$) we predict the occurrence of a structural distortion which vanishes only when [100] is the easy magnetization direction. An extraordinary external s…
The resistivity, Hall effect and magnetic susceptibility have been measured as a function of temperature for the first row transition metal intercalates of niobium disulphide, M1/3NbS2 (M = Mn, Fe, Co, Ni), where the intercalate ions form an ordered superlattice. Metallic behaviour, associated with conduction in the n…
Abstract An electron microscope study of collagen fibrils from fixed tail tendons of rats has revealed that from some time shortly after birth until maturity, the fibril diameters have a bimodal distribution. The “two” types of fibril are indistinguishable in both transverse and longitudinal section. Unfixed specimens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative kinetics of high-temperature reaction between hydrogen sulfide and selected metal oxidesPhillip R. Westmoreland, James B. Gibson, and Douglas P. HarrisonCite this: Environ. Sci. Technol. 1977, 11, 5, 488–491Publication Date (Print):May 1, 1977Publication History…
High-voltage breakdown measurements were made in two similar particle contaminated coaxial test systems, one with AC and the other with DC voltages. Information is presented on the effects of particle size, shape, and material for both SF6and N2gases at pressures up to 15 atm in a plain coaxial gap and a coaxial gap i…
The proton NMR spectra of unligated ferrous porphyrins, proposed to exist in the intermediate S = 1 spin state, have been recorded and analyzed. The dominant dipolar shifts for the phenyl protons in tetraphenylporphinatoiron(II) result in a quantitative measure of the axial magnetic anisotropy, which, together with th…
The structure of a suspension of highly charged macromolecules indicates both solidlike and liquidlike phases separated by a distinct melting point. Here the structure factor of the liquidlike phase measured by optical techniques is analyzed using methods previously developed for simple fluids. The hypernetted-chain a…
Analytical models are presented describing the x-ray-excited emission of ’’no-loss’’ photoelectrons and Auger electrons and the energy distribution of emitted secondary electrons. The secondary electron energy distribution is given in terms of the electron kinetic energy EK, work function W, photon energy Eo, and mass…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in transition metal dimers. 10. Structural and magnetic characterization of oxalate-bridged, bis(1,1,4,7,7-pentaethyldiethylene triamine)oxalatodicopper tetraphenylborate and related dimers. Effects of nonbridging ligands and counterions on exc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonomer Sequence Distribution in Ethylene-Propylene Rubber Measured by 13C NMR. 3. Use of Reaction Probability ModelC. J. Carman, R. A. Harrington, and C. E. WilkesCite this: Macromolecules 1977, 10, 3, 536–544Publication Date (Print):May 1, 1977Publication History Published…
Composite powders were hot‐pressed to determine the phase relations in the Si 3 N 4 ‐SiO 2 ‐Y 2 O 3 pseudoternary system. Four quaternary compounds, Si 3 Y 2 O 3 N 4 , YSiO 2 N, Y 10 Si 7 O 23 N 4 , and Y 4 Si 2 O 7 N 2 , were identified. Studies of polyphase and single‐phase materials in this system showed that these…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLCST Behavior in Polymer BlendsR. E. Bernstein, C. A. Cruz, D. R. Paul, and J. W. BarlowCite this: Macromolecules 1977, 10, 3, 681–686Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 May 1977https://doi.org/10.1021/ma60057…
The theory of spin relaxation for liquid crystals is examined with the objective of properly analyzing the statistical interdependence of the faster rotational reorientation of the individual spin-bearing molecules and the (slower) director or order-parameter fluctuations. The analysis is presented in terms of a compo…
(1977). Some Bending Measurements on Yarns. The Journal of The Textile Institute: Vol. 68, No. 5, pp. 188-189.
On the basis of elastic waves released by imploding cavitation bubbles, a mechanism for biological cell disintegration in high intensity ultrasound has been proposed. Comparison of this mechanism with the published results on yeast cells shows many points of agreement suggesting that yeast cell disintegration in ultra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation and PurificationCite this: Anal. Chem. 1977, 49, 6, 499APublication Date (Print):May 1, 1977Publication History Published online24 May 2012Published inissue 1 May 1977https://doi.org/10.1021/ac50014a729RIGHTS & PERMISSIONSArticle Views47Altmetric-Citations-LEARN A…
A detailed analysis is given for three techniques used to determine the tilt bias angle of a nematic liquid crystal in contact with a boundary surface. Two of these methods, the crystal rotation and capacitive methods, have severe disadvantages, such as a restricted range of application, an insufficient accuracy, and…