Materials Literature
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Some allophanic soils in Japan, developed from deposits of volcanic ashes have aggregates, the sizes of which are mostly those of silt and sand, and which are very stable against the ordinary soil dispersion treatment such as decomposition of organic matter with hydrogen peroxide and addition of deflocculants to the s…
Summary Polarized spectra (2000 to 25000 Å) have been obtained for fifteen analysed trioctahedral micas covering a wide range of compositions, and including four phlogopites, nine biotites, and two lepidomelanes. Three main contributions to the absorption have been noted: charge transfer from oxygen to ferrous iron th…
Abstract The relation between biophysical properties of the skin of horticultural products and the rate of moisture loss under different ambient conditions is explained by a mathematical model. The numerical values of these properties can be determined by a simple experimental method. The effect of different air veloc…
SUMMARY The marine centric diatom Biddulphia levis produced uniflagellate fusiform male gametes completely within the parent cell frustule. These gametes lacked both a central pair of microtubules in the flagellar axoneme and chloroplasts but did contain a cone of microtubules which passed posteriorly from the base of…
Abstract Exposing one face of a catalyst pellet to a pulse of tracer gas and analyzing the response at the opposite and provides a dynamic method for measuring the effective diffusivity of porous catalysts. The first and second moments of the response peak are shown to be a function of only D e and the geometry of the…
The biosynthesis of vitamin B6 was studied in an Escherichia coli mutant, blocked between pyridoxol and pyridoxal. Specific incorporation of glycerol, pyruvate, serine, and glucose was shown by chemical degradation of labeled samples of pyridoxol isolated from the medium of cultures which had been incubated with vario…
The pair distribution function in amorphous deposited silicon monoxide has been measured at room temperature. The result is not in good agreement with expectations for a mixture of well-defined amorphous silicon and amorphous SiO2. Other possibilities, for which the average number of nearest-neighbor Si–O bonds per at…
Rate constants for collisional detachment of NO−, NO− + X → NO + X + e,have been measured from 193 to 506°K for X as He, Ne, H2, NO, CO, CO2, N2O, and NH3. The data fit Arrhenius plots kd=Ae−E/kT with both A and E showing large variations with X. From equilibrium constant considerations, electron attachment rates to N…
The spin density distributions in two alloys of iron and silicon (approximate compositions Fe3Si and Fe4Si) have been determined by polarized neutron diffraction. The observed data have been corrected for the effects of extinction and have been analysed by the standard Fourier method and also by expressing the density…
The structures of electroplated and vapor-deposited copper films have been studied by x-ray diffraction. While there was no evidence of stacking faults in any of these films, the electroplated films were characterized by presence of twins, large thickness-dependent microstrains, and small particle sizes. The vapor-dep…
Charge deposition on 2–25-μ m polyethylene terephthalate (PET), polyfluoroethylenepropylene (FEP), and polycarbonate (PC) foils by application of fields up to, and exceeding breakdown strength in the polymers is reported. The greatest negative or positive charge densities on PET foils metalized on one side are in exce…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation I. AITCHISON, B. COX; Interpretation of Fractographs of SCC in Hexagonal Metals. CORROSION 1 March 1972; 28…
Antimonic acid cannot be dehydrated by heating in air to give products of constant and reproducible weight without simultaneous reduction of some of the Sb V to Sb III . Neither anhydrous Sb 2 O 5 nor the hydroxy oxide Sb 3 O 6 OH postulated by Dihlström and Westgren can be obtained by this method. Two well-defined pr…
Two titanium centers (A–Ti–H and B–Ti–H) are formed in equal concentrations by reaction of hydrogen atoms with Ti4+ in the α-quartz lattice at 120°K. Above 150°K, B–Ti–H transforms into A–Ti–H. The spin Hamiltonians, including 47,49Ti hyperfine and nuclear quadrupole terms, have been determined by 9.850-GHz EPR at 20°…
Abstract In einem Durchfluß‐Kreislaufreaktor wurden bei der CO‐Oxidation an Platin unter isothermen Bedingungen sprunghafte Instabilitäten und periodisches Verhalten beobachtet. Die sprunghaften Instabilitäten lassen sich mit der gemessenen Formalkinetik deuten. Die Deutung des periodischen Reaktionsablaufes wird unte…
Abstract A phenomenological theory has been developed for explaining the anomalous dielectric and electro‐mechanical properties of some improper ferroelectrics. An ordering parameter 8, which plays the role of a trigger for the onset of the spontaneous polarization P is introduced into the thermodynamical potential fu…
We report herein the preparation of a form of noncrystalline Ge film by rf sputtering on to various substrates, which crystallizes with ``explosive'' velocities when triggered by a localized transient energy pulse. The films show this phenomenon only when they are thicker than about 10 μ. The crystallization wave appe…
Abstract Anisotropic growth of β‐form crystals of isotactic polypropylene in type III and type IV spherulites has made possible microanalysis of the unit cell structure, optical properties, and crystal arrangement within the spherulites. Micro x‐ray studies of the type III and type IV spherulites show that interspheru…
In view of recent x-ray experiments which detected a surprisingly strong diffuse scattering in the {100} reciprocal sheets of KTa${\mathrm{O}}_{3}$, a new neutron-scattering investigation was performed to determine the origin of this scattering. It was found that a strong anisotropy in the dispersion of the low-lying…
The electron spin relaxation processes for oblate and prolate symmetric top paramagnetic probes dissolved in liquid crystals are studied by solving the diffusion equation for molecules subjected to an orienting potential, expressed as a series expansion of Legendre polynomials. The line shape variations upon ordering…