Materials Literature
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Abstract Apparatus has been developed for studying the development of crystallinity and orientation during the melt spinning of synthetic fibers. Tension in the fiber and temperature, diameter, and x‐ray diffraction patterns are measured as a function of distance from the spinneret for a running monofilament. Measurem…
In order to get an idea of the possible neutron small-angle scattering experiments with solutions of macromolecules at the high-flux reactor of the Institut Max von Laue–Paul Langevin at Grenoble, aqueous solutions of molecules with molecular weights from about one hundred to several millions have been studied. Changi…
The crystal structure of KTiPO 5 , determined by a simultaneous use of the tangent-formula method and the Patterson method, is described in space group Pn 2 1 a . Lattice constants are: a = 12.814 Å, b = 10.616 Å, c = 6.404 Å. This compound is a monophosphate whose chemical formula must be written KTiOPO 4 . Distorted…
The use of synchrotron radiation as an intense X-ray source for biological diffraction has only very recently been promoted into a long-term experimental programme. Here we report on some general and some detailed aspects of this development. In the case of small-angle studies on weakly scattering specimens at high ti…
Abstract From polarized reflection spectra of TEA(TCNQ) 2 single crystals at room temperature, quantitative values of the complex dielectric function ε(ω) and the optical conductivity σ(ω) in the range from the far infrared to the ultraviolet have been derived. The polarization of the vibrational bands almost exclusiv…
A survey, comparison, and critical analysis is presented of data compiled from the scientific literature concerning diffusion in copper-silver and copper-gold systems. Here the term ``copper alloy system'' is interpreted in the broadest sense. For example, the review of diffusion in the Cu-M system reports all diffusi…
(1974). A Proposed Standard Procedure for Static Muscle Strength Testing. American Industrial Hygiene Association Journal: Vol. 35, No. 4, pp. 201-206.
Abstract In the presence of maleic anhydride‐grafted polypropylene, marked dispersibility of the polymer blend of isotactic polypropylene and nylon 6 was obtained. This appeared to be caused by the formation of a certain graft polymer between maleic anhydride in polypropylene and terminal amino groups of nylon 6. The…
(The Nature of Polymer Glasses, Their Packing Density and Mechanical Behaviour).- The Nature of Polymeric Glasses.- The common glassy polymers.- The softening of polymer glasses.- Polymer melts and rubbers.- The crystallisation of polymers.- Amorphous isotactic polymers.- The morphology of amorphous polymers.- Packing…
Questions associated with the magnetic susceptibility of the d-band transition metals that are not magnetically ordered, i.e., that are neither ferromagnets nor antiferromagnets, are reviewed. The principal components of the magnetic susceptibility of the transition metals are discussed, theoretical estimates of these…
A series of experiments were carried out on growing depth hoar in our laboratory and observations made on depth hoar in a natural snow cover.Depth hoar crystals grew in snow when the snow was subjected to a consistent negative temperature gradient for a considerably long p3riod.Depth hoar crystals were classified into…
A spherical retarding-field electron energy analyser has been constructed to investigate the backscattering and transmission of electrons in the energy range 10-30 keV. It consists of full-spherical meshes with collector, and attains a resolution of about 2%. By using this apparatus, the energy distribution of electro…
The Holt relation d = Kϱ−1/2 between dislocation cell diameter d and average dislocation density ϵ is found to apply to Mo–50wt% Re when K = 4. Comparison with other published dislocation cell data shows that K does not remain constant, but varies from metal to metal. The effect of stacking fault energy on the K value…
Electrical conduction due to thermal activation of electrons from impurity sites is studied in the case of amorphous insulating films of large impurity densities. Considering a two-centre model the central barrier is assumed to be the current-limiting one in the whole field range for the investigation of the influence…
Motion of screw dislocations in b.c.c. lattices at 0 °K has been computer-simulated by applying shear stress on the {110} plane of a model crystal block, using systematically varied interaction potentials between atom rows parallel to the Burgers vector. For all the potentials used, the core of the dislocation moved i…
Aqueous films on terrestrial litter are inhabited by numerous microorganisms; the surfaces of such films are covered by monolayer-forming substances. The spreading pressure of the latter can result in transport of floating and submerged organisms to adjacent water films with clean surfaces. The clean surfaces, produce…
The electron Compton profiles for diamond have been calculated in the impulse approximation from two self-consistent crystalline Hartree-Fock momentum distributions in the [100], [111], [110], [112], and [221] directions. The two calculations use slightly different Gaussian basis sets. The results agree closely with e…
We report our measurements on KIO2F2 and compare these results with the parent MIO3 compounds where M denotes H, Li, etc. Our results show that the nine observed nonlinear coefficients (d's) in these four different crystal systems, composed of IO3− and IO2F2− ions, are geometrically related to only one microscopic bon…
An upper bound to the resistivity of an Einstein solid is calculated using the variational method of Ziman with the usual trial function, and is shown to be proportional to the product of the local-mode specific heat and the temperature. This formula gives an improved fit to the results of recent measurements on the i…
Amorphous Sb films ranging in thickness between 170 and 14 000 \AA{} were prepared at 77\ifmmode^\circ\else\textdegree\fi{}K in three different ways: getter sputtering, evaporation from Sb, and evaporation from PtSb. The electrical resistivity of these various films is well fitted between 30 and 160 \ifmmode^\circ\els…