A technique for obtaining clean cut surfaces on wood samples prepared for the scanning electron microscope
SUMMARY A technique is described for obtaining clean cut surfaces on wood samples prepared for the scanning‐electron microscope.
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The charge-transfer contribution to the intensity of hypersensitive trivalent lanthanide transitions
By considering the variation of charge-transfer energy and of the intensity parameters across isostructural series it is concluded that charge-transfer mixing is of negligible importance in accounting for the intensity of the hypersensitive transitions of the trivalent lanthanides. The experimental relationship betwee…
Wave‐Vector Dependence of the Electron Energy Losses of Boron Nitride and Graphite
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…
Accurate microcrystallography using electron back-scattering patterns
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…
Compositions of Solutions in Contact with Hydrating Tricalcium Silicate Pastes
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…
Magnetostriction and structural distortion in rare-earth intermetallics
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…
Electrical and magnetic properties of some first row transition metal intercalates of niobium disulphide
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…
Quantitative electron microscope observations of the collagen fibrils in rat‐tail tendon
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…
Comparative kinetics of high-temperature reaction between hydrogen sulfide and selected metal oxides
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…
Influence of particles on AC and DC electrical performance of gas insulated systems at extra-high-voltage
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…
Nuclear magnetic resonance investigation of magnetic and electronic properties of "intermediate spin" ferrous porphyrin complexes
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…
Colloidal suspensions as soft core liquids
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…
0.1–10-keV x-ray-induced electron emissions from solids—Models and secondary electron measurements
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…
Magnetic 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 exchange interactions
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…
Monomer Sequence Distribution in Ethylene-Propylene Rubber Measured by 13C NMR. 3. Use of Reaction Probability Model
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…
Phase Relations and Stability Studies in the Si 3 N 4 ‐SiO 2 ‐Y 2 O 3 Pseudoternary System
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…
LCST Behavior in Polymer Blends
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…
Stochastic-molecular theory of spin–relaxation for liquid crystals
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…
Some Bending Measurements on Yarns
(1977). Some Bending Measurements on Yarns. The Journal of The Textile Institute: Vol. 68, No. 5, pp. 188-189.
Mechanism of disintegration of biological cells in ultrasonic cavitation
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…