Materials Literature
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We have measured the correlation range for fluctuations of the orientational order parameter in the isotropic phase of the liquid crystal $p$-methoxy benzylidene, $p\ensuremath{-}n$ butyl aniline (MBBA). The correlation range was found to diverge as ${(T\ensuremath{-}{T}_{c}*)}^{\frac{\ensuremath{-}1}{2}}$, in agreeme…
We have measured the valence-band density of states and the energies of the core levels of crystalline and amorphous GeTe with x-ray photoemission. The density of states of the amorphous form is found to be very similar to that of the crystal. The present results indicate that the atomic orbitals primarily determine t…
Brillouin-scattering results are reported for monodomain samples of $\ensuremath{\beta}$-methyl butyl $p$ [($p$-methoxy benzylidine)amino] cinnamate in both the smectic-$A$ and -$B$ phases. For both phases theoretical predictions are confirmed concerning the number and polarizations of the propagating hypersonic waves…
Article Verträglichkeit zwischen Materialkomponenten ın Metall-Keramik-Verbundwerkstoffen was published on April 1, 1973 in the journal International Journal of Materials Research (volume 64, issue 4).
The distortions occurring due to the image formation system of the scanning electron microscope are considered with respect to their origins and their effect on the micrographs obtained. A method for evaluating the distortion and subsequently correcting angular or linear measurements made from SEM micrographs is prese…
Using temperature as a pitting criterion, a critical pitting temperature has been defined for molybdenum-bearing austenitic stainless steels containing nominally 18% Cr which provides a quantitative measure of their pitting resistance. Single phase alloys had increasing resistance to pit initiation with increasing Mo…
The pressure required to cause a spinning solution to flow through the spinnerette hole in a wet-spinning process has been found to decrease as the take-up velocity V1 is increased. The amount of pressure reduction from free extrusion, where V1 = Vf, to V1 denoted by p(Vf)–p(V1) was found to correlate well with the te…
A series of tests have been conducted to measure the effects of fatigue loading on environmental stress crazing in PMMA. Testing in methanol has shown that long crazes are grown prior to fracture in the same manner as previously observed for constant-load conditions. An analytical model which had been used to describe…
Experimental microstructural evidence is presented to show that the intervortex spacing decreases monotonically with increasing applied voltage beyond the ``secondary'' hydrodynamic threshold for all doped negative nematic liquid crystal films.
The importance of lateral pressure in the tension and bending behaviour of yarns and fabrics is discussed. To determine the lateral pressure between fibres, a specific model is considered, that of a filament helically wound around a cylinder. The equations governing the equilibrium of the filament are derived and both…
Fluorescence transients were investigated with the diatom Phaeodactylum tricornutum. Supplementary experiments were done with Chaetoceros sp. Under weak excitation (˜103 erg/cm2sec), fluorescence transients were induced simply by die oxidation-reduction reaction of Q, the primary reductant of photosystem II. The actio…
This work is a study of some dilute solution properties of polyhexene-1. Results with the following experimental measurements are reported: osmotic pressure, phase equilibrium, viscosity, light scattering, molecular weight, molecular weight distribution, and degree of chain extension. Three good solvents were used, cy…
Measurements at high temperature of integrated intensities of Bragg peaks were used to examine the defect structure in two NiO‐CoO solid solutions. The results indicate that the concentrations of vacant cation sites at 1100° to 1500°C are 4 to 10% and the tetrahedral occupations 2 to 5%. The concentration of these def…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotassium sulfate crystal growth rates in aqueous solutionJohn W. Mullin and Czeslaw GaskaCite this: J. Chem. Eng. Data 1973, 18, 2, 217–220Publication Date (Print):April 1, 1973Publication History Published online1 May 2002Published inissue 1 April 1973https://doi.org/10.10…
The compressive creep of carbides having the composition U 0.79 Pu 0.21 C 1.02 and a sintered density of 11.8 g/cm 3 was studied at 1300°, 1400°, and 1500°C and stresses of 2000, 4000, and 6000 psi. The equation which best fitted the data was The dominant creep mechanism was probably grain‐boundary sliding. The hardne…
A neutron diffraction study on the powder samples of FeMnP has been made in order to determine the magnetic structure as well as the ordering of iron and manganese atoms. It is ascertained that iron and manganese atoms occupy the tetrahedral and pyramidal sites, respectively. FeMnP is antiferromagnetic with the Néel t…
Abstract Choline kinase was purified approximately 300-fold, in 5% yield, from an autolysate of dried brewers' yeast. A molecular weight of 67,000 was estimated using a Stokes radius of 33 A, as determined by Sephadex G-200 chromatography. An s20,w of 4.8 S was obtained by sucrose density gradient centrifugation. Enzy…
The heat capacity of ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ has been measured between 0.3 and 10 K at pressures of 1 and 25 kbar. The results confirm that the very high electronic heat capacities measured for doped samples are characteristic of pure ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ in the metallic phase.
Abstract Amorphous thin films of tellurium have been prepared by condensation on the substrate at liquid helium or nitrogen temperature in high vacuum, and a transmission electron diffraction study of these films has been undertaken. Diffraction patterns of such films show diffuse halos, which are characteristic of a…
Existing formulations for systems with complete translational invariance relate the dielectric function to the scattering probability in characteristic-energy-loss experiments. We have extended this relationship to the case of periodic systems. Energy-loss vs momentum-transfer measurements are of value because they pr…