Materials Literature
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Abstract In an attempt to understand the factors involved in morphogenesis of a complex cell like a scale or bristle, the fine structure of the normal development of bristle cells in Drosophila melanogaster (Oregon R) has been studied and compared with that of the mutants sn 3 and Sb. In the development of the normal…
The diffusion-controlled interphase-boundary migration problem is defined by a system of equations in which the boundary conditions for the diffusion equation are determined by capillarity. Numerical computer solutions to these equations were obtained for steady-state Widmanstätten ferrite plate growth. The effect of…
The solidification of a binary system differs from a pure metal in that the latent heat effect no longer occurs at the melting point but rather in a freezing zone between the liquidus and solidus temperatures. Such solidification is analyzed from a heat-transfer point of view. The system considered occupies a semi-inf…
The absorption edge spectrum of thin films of SnO2 has been obtained at room temperature using unpolarized light. The dependence of the absorption coefficient upon film resistivity has been noted and an impurity peak at about 3.4 eV has been observed. The measurements suggest an indirect edge near 2.7 eV and a direct…
Abstract The effect of preheat treatment at temperatures below the glass transition for various periods of time on selected properties of molded polycarbonate has been studied. Changes in tensile and flexural strength as functions of time and preheat temperature (80–140°C.) were determined and these are discussed in r…
Each moving unit of a long, flexible, molecule induces in the surrounding solvent a velocity field which reacts on the motion of other segments. This long-range hydrodynamic interaction modifies strongly the dynamical form factor $S(\mathbf{q}\phantom{\rule{0.25em}{0ex}}\mathrm{\ensuremath{\omega}})$ at low frequencie…
1. The membrane conductance of the crayfish muscle fibre was calculated and the increase in the membrane conductance brought about by the application of gamma-aminobutyric acid (GABA) was investigated under various conditions. The permeability of the activated inhibitory post-synaptic membrane was estimated from the c…
Flashover tests were conducted at the Leadville EHV Test Facility of the Public Service Company of Colorado and Project EHV at Pittsfield, Mass., to obtain comparative data to evaluate the influence of air density on switching surge and impulse flashover strength of transmission line insulation. The tests showed that…
Electrical resistivity and powder neutron diffraction patterns for Cr-V-Mn ternary dilute alloys have been measured at various temperatures. From the measurement an estimation is made on the Néel temperature, spin arrangement, average magnetic moment and wave vector of spin density wave. The ternary data are compared…
The two-dimensional analysis of the dry-relaxed knitted loop given in Part I of this series is extended to three dimensions by considering the couples acting on the loop at the points of interlocking. The fabric dimensional parameters and the knitted-fabric cover are evaluated for the three-dimensional structure, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of some new perovskites containing indium and thalliumRobert D. ShannonCite this: Inorg. Chem. 1967, 6, 8, 1474–1478Publication Date (Print):August 1, 1967Publication History Published online1 May 2002Published inissue 1 August 1967https://pubs.acs.org/doi/10.1021/…
A series of tests, carried out by applying impulse waves simulating switching surges to air gaps with electrodes of different shapes, is described. From the test results, it has been possible to draw some important conclusions about the influence of the electrode shape and also to single out simple rules for the prede…
The velocity of dislocations of mixed edge-screw type in copper crystals of 99.999% purity has been measured as a function of stress at room temperature. Dislocation displacements produced by torsion stress pulses of microsecond duration were detected by etch pitting {100} surfaces. A nearly linear relationship betwee…
The melting, crystallization, and Form II to Form I transformation of isotactic polybutene-1 were studied under hydrostatic pressures up to 5000 atm. The melting behavior of Form I was similar to that of other polymers, showing an increase in melting temperature and decrease in the volume of melting with pressure. Cry…
A change of atomic arrangement of SbSI between the paraelectric phase and the ferroelectric phase is investigated. Analyses are made on Weissenberg photographs taken at 35°C (paraelectric phase) and at 5°C (ferroelectric phase). In the paraelectric phase (space group D 2 h 16 - Pnam , lattice constants, a =8.52Å b =10…
A geometrical treatment is given which allows the description of the near-neighbour relations of lattice points in interpenetrating lattices. It is related to the coincidence site lattice and opens new ways for the study of grain and phase boundaries.
The inhibition of steel corrosion in mineral acids by simple amines is shown to follow the Langmuir adsorption isotherm over a wide concentration range (10–5 to 10–3 M). From a comparison of activation energies of uninhibited and inhibited corrosion reactions, heats of adsorption of amines may be obtained. These fall…
Abstract The ultimate tensile strength and modulus of elasticity of individual osteons from human and ox compact bone were determined with a specially designed microwave extensimeter. The results were related to the degree of calcification and the orientation of collagen fiber‐bundles in successive lamellae of the ost…
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Abstract Durch Pyrolyse kohlenstoff‐haltiger Gase bei rd. 2000°C und Abscheidung des dabei anfallenden elementaren Kohlenstoffs auf einem glatten Substrat erhält man einen Graphit', der einen hohen kristallographischen Orientierungsgrad besitzt und dessen physikalische Eigenschaften zum Teil stark richtungsabhängig si…