Materials Literature
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Recently developed rigorous theories have been used to investigate the diffraction efficiency behavior of both blazed and holographic gratings. In order to assist designers of spectrometric systems we have covered a complete range of blaze angles for triangular grooves and modulations for sinusoidal groove shape in fi…
This paper presents a physical description of the action of ZnO varistors, which are complex ceramic bodies of ZnO grains sintered in an oxide flux; their conductivity is very low at low voltage, but becomes high after a certain breakdown voltage is reached. It is found that depletion layers in the ZnO adjacent to the…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Sea water corrosion studies on Cu-Ni-Fe alloys ranging in nickel content from 0 to 30% and iron content from <0.05 to 2% have demonstrated a synergistic effect between nickel and iron in these copper alloys. This effect is apparent in corrosion data such as low velocity sea water and jet impingement tests, as w…
Solubilities of specially synthesized coarse-grained barite were determined in H/sub 2/O solutions from 22 to 280/sup 0/C and 1 to 1400 bars, and in 0.2 and 4 molal NaCl solutions from 100 to 250/sup 0/C and 1 to 500 bars. Isobaric solubilities are maximum near 100/sup 0/C in H/sub 2/O solutions; the maxima migrate to…
The elastic constants of zinc are compiled and reviewed; one hundred references are cited. The included elastic constants are: Young’s modulus, shear modulus, bulk modulus, compressibility, Poisson’s ratio, second-order single-crystal elastic stiffness and compliances, and third-order, elastic stiffness. Temperature a…
A new numerical method is presented for simultaneous smoothing, desmearing and Fourier transformation of X-ray and neutron small-angle scattering data. The method can only be applied to scattering curves from dilute particle systems, i.e. for scattering media whose distance distributions are zero beyond a certain valu…
A survey is given of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and 3d transition elements. Apart from binary compounds the results of pseudobinary series are also considered. The magnetic properties determined by the exchange interactions i…
The basic theory relating to the design of reinforced concrete beam-column joints is reviewed and extended. In particular, the theory of an alternative joint detail using bond plates is developed.
For pt.I see ibid., vol.7, p.2023 (1974). Polycrystalline Tb x S, Tb x Te and Ho x Te (0.85<or=x<or=1) with NaCl structure show antiferromagnetic FCC II order. The magnetic moments of Tb x S and Ho x Te are found to be oriented similarly to Tb x Se, and equivalent monopnictides, and correspond to theoretical predictio…
The structural and magnetic properties of the system V1-xAlxO2+or-y have been investigated by X-ray diffraction, NMR, magnetic susceptibility and EPR measurements. The existence of two insulating intermediate phases M2 and T between the insulating M1 and the metallic R is confirmed. The effect of oxygen non-stoichiome…
The authors have extended to lower temperatures and frequencies, a recent dielectric study of hydroxyl doped vitreous silica. At given frequency the dielectric constant has a minimum at a temperature proportional to f 1/3 while at given temperature the loss angle has a maximum proportional to T 0.28 at a frequency pro…
Abstract Sulfuration of natural rubber (NR) by the binary accelerator 2‐mercaptobenzothiazole (MBT) and diphenylguanidine (DPG) both in presence and in absence of ZnO and stearic acid with or without dicumylperoxide (DCP) was studied in detail. It was observed that the rate of decomposition of DCP in presence of both…
Abstract The polyamic acids from pyromellitic dianhydride, benzidine (B) and hydrazine (H) were prepared and characterized by intrinsic viscosity measurements in dimethylformamide (DMF) solutions. The hydrolytic stability of these polymers was determined by keeping the DMF solution in presence of air at room temperatu…
Abstract Films prepared from emulsion polymerized poly(vinyl chloride) were subjected at 0°C to accelerated photodegradation in air using a weatherometer. Photooxidation and scission of the main chain took place but dehydrochlorination or formation of polyenes was not observed. The absorption of the carbonyl group ind…
Abstract Crystal structure determinations of two metal‐ion complexes with noncyclic ionophores are reported: (i) CaCl 2 complex of N,N,N′,N′‐Tetrapropyl‐3,6‐dioxa‐octane diamide, space group Fddd, a = 14.659, b = 19.616, c = 33.173 Å; (ii) MnBr 2 complex of N,N,N′,N′‐Tetrapropyl‐1,2‐cyclohexylenedioxydiacetamide, spac…
Reversible photochromic reactions can be coupled to carrier-mediated transport processes in membranes to bring about the separation or concentration of selected permeants. Carbon monoxide has been pumped against of fourfold concentration gradient by differentially illuminating a hemoglobin membrane. The extent of conc…
The structural first-order phase transition of the layer structure (CP2H5NH3)2CdCl4 at 216 K is studied by single-crystal X-ray diffraction. The low-temperature phase (OLT) belongs to the space group Pcab, whereas the room-temperature phase (ORT) belongs to the space group Bmab. In both structures, the hydrogen atoms…
A new film-bulk method is used for the measurement of the depth distribution of current density and absorption of incident primary electrons penetrating into solid targets of Be, Al, Cu, and Au, As well the depth dependence of the generation of secondary electrons in the interior of the targets is determined experimen…
Energy distribution curves (EDC's) of photoelectrons emitted normal to the surface have been measured for the (0001) and (10\ifmmode\bar\else\textasciimacron\fi{}10) single crystal faces and for evaporated polycrystalline films of cobalt. Incident photon energies of 11.83, 16.85, and 21.22 eV were used. The EDC's of t…