Axial buckling of pressurized imperfect cylindrical shells
Buckling load of cylindrical shell with asymmetric and axisymmetric imperfections and calculation of upper bound to buckling load for shell with axisymmetric imperfections
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An electron microscope study of neutron irradiation damage in alpha-iron
The technique of transmission electron microscopy has been used to study neutron irradiation damage in α -iron. Foils were irradiated to a fission neutron dose of ∼ 2 × 1020 cm−2 at 60°c and the effects of annealing up to 500°c on the micro-hardness and structure were studied. The irradiated foils contained visible po…
The System MgO‐ZnO‐SiO 2
The system MgO‐ZnO‐Sio 2 was studied by the quenching technique. No ternary compounds were found in the system, but extensive solid solution relations occurred in the magnesiumand zinc‐bearing compounds. Two ternary eutectics and one reaction point were located; the minimum melting point in the system was 1370°± 5°C a…
The effects of phase matching method and of uniaxial crystal symmetry on the polar distribution of second-order non-linear optical polarization
The index matching technique of Giordmaine and Maker has been extended to include the more general three-wave interaction. Two fundamentally different experimental arrangements may be considered; one has the two low frequency waves in parallel polarizations and the other has these waves in orthogonal polarizations. Th…
THE CRYSTAL DYNAMICS OF URANIUM DIOXIDE
The frequency/wave-vector dispersion relation for normal modes of vibration propagating along the [00ζ], [ζζ0], and [ζζζ] directions in uranium dioxide at 296 °K has been determined by studying the coherent one-phonon scattering of slow neutrons from a single-crystal specimen. Analysis of the results shows that a simp…
Outer-Shell Overlap Integrals as a Function of Distance for Halogen—Halogen, Halogen—Alkali, and Alkali—Alkali Ions in the Alkali Halide Lattices
The outer s- and p-electron overlap integrals involving ns, npσ, and npπ orbitals have been computed for all combinations of ion pairs in all of the alkali halide lattices. The free-ion closed-shell Hartree—Fock wavefunctions were used in all calculations. The halogen—alkali (H—M) overlaps are listed at the equilibriu…
Kinetics of the Anatase‐Rutile Transformation
Transformation of three commercial anatase powders resulted in sigmoid curves of transformation vs. time, which were interpreted in terms of a nucleation‐growth process. Analysis of these curves by several rate laws led to activation energies for nucleation of 109, 136, and 148 kcal/mole and for growth of 100, 115, an…
ADVANCES IN THE CHEMISTRY OF POLYETHYLENEIMINE (POLYAZIRIDINE)
CONTENTS I. Methods of synthesising polyethyleneimine 516 II. Polymerisation of aziridine 516 III. Thermal decomposition of 2-oxooxazolidine 520 IV. Properties of polyethyleneimine 522 V. Reactions of polyethyleneimine 523 VI. Copolymers of aziridine 525
Germanium and Silicon Disulfides: Structure and Synthesis
A series of carbon-14 measurements of 18th- and 19-century wood revealed an excellent correlation between the variations in carbon-14 content and average sunspot activity. It seems probable, therefore, that the predominant cause of the short-term fluctuations in carbon-14 activity is the variability of solar activity.
The Properties and Irradiation Behavior of U₃Si₂
Abstract: A limited study of the compound U₃Si₂ has been made in reference to its use as a prospective nuclear fuel in sodium cooled reactors.
E.p.r. and endor of Tb4+ in thoria
Abstract E.p.r. and endor spectra have been measured in ThO2 containing Tb4+. The crystalline electric field is cubic, and the splittings are very large compared with other S state ions. The values of the parameters in the standard cubic spin-Hamiltonian are: g = 2·0146 ±0·0004, 60B4 = —2527·53 ±0·10 Mc/s, 1260B6 = —2…
X-Ray Scattering from an Electron Gas
We show that the x-ray scattering from an electron gas in the large-momentum-transfer regime ($k\ensuremath{\gg}\frac{{P}_{F}}{\ensuremath{\hbar}}$) is a direct measure of the one-dimensional momentum distribution of the particles (including correlations). If the recoiling electron's momentum is measured in coincidenc…
Thermal Conductivity of Elements with Complex Lattices: B, P, S
The thermal conductivities of $\ensuremath{\beta}$-rhombohedral boron, orthorhombic (black) phosphorus, and orthorhombic sulfur have been measured down to 3\ifmmode^\circ\else\textdegree\fi{}K. These results, as well as some from the literature on cubic (white) phosphorus and on boron carbide, have been interpreted by…
Bound Excitons and Donor-Acceptor Pairs in Natural and Synthetic Diamond
Recent studies on x-ray and electron-excited luminescence (cathodoluminescence) in natural and synthetic diamond provide evidence that the previously reported band-$A$ luminescence is due to the radiative recombination across the indirect energy gap of electrons and holes separately trapped at donor and acceptor cente…
Magnetostriction, Forced Magnetostriction, and Anomalous Thermal Expansion in Ferromagnets
In previous papers we have formulated the theory of magnetostriction arising from single-ion crystal-field effects, for cubic crystals, and we have shown that the theory accounts extremely well for the temperature dependence of the magnetostriction in yttrium iron garnet. We here summarize that theory, extend it to ar…
Spin Delocalization in Mixed Tetrahedral Ni II Complexes
Proton magnetic resonance spectra of a number of paramagnetic Ni II chelates of the type NiL1L2 where L1 and L2 are different aminotroponeimine ligands have been examined. The proton resonances show large hyperfine contact interaction shifts due to delocalization of spin density from the metal to the ligand by dπ—pπ b…
On the Molecular Kinetic Theory of Cooperative Relaxation Processes in Dipolar Liquid and Crystalline Phases
The correlation-function method is used to describe the dielectric relaxation behavior of liquids and directionally isotropic crystalline phases. The physical model used is that of a regular mixture of dipole molecules and vacancies on a lattice, i.e., the equivalent of the Bragg—Williams approximation. To calculate t…
Mass-Spectrometric Study of the Oxidation of Tungsten
A mass spectrometer has been used to study the kinetics of the oxygen—tungsten reaction over the temperature range 1400° to 3150°K at oxygen pressures as high as 2×10−4 Torr. The main products of chemical reaction are identified as W3O9, W2O6, WO3, and WO2; their intensities are given as a function of surface temperat…
Effective Conduction-Electron-Local-Moment Exchange Interaction in Metals: Rare-Earth Interband Mixing
The effective diagonal-exchange parameter ${J}_{\mathrm{eff}}(0)$ which determines the exchange splitting of a metal's Fermi-surface conduction electrons, has been investigated with a model involving simple orthogonalized-plane-wave conduction-electron orbitals and rare-earth ion cores. The positive exchange integral…
Adsorption of Oxygen and Nitrogen on Molecular Sieves.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of Oxygen and Nitrogen on Molecular Sieves.R. M. Thorogood, G. M. Wilson, and J. M. GeistCite this: J. Chem. Eng. Data 1965, 10, 3, 269–274Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.…