Materials Literature
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Environmental and fallout gamma radiation protection factors (PF's) were estimated for a variety of civilian transportation vehicles using measurements of the natural terrestrial radiation as a source. The PF values are below 2 in light vechicles, truck beds, or trailers; from 2.5 to 3 in the cabs of heavy trucks and…
Abstract The sulfonation of polyamides (Nylons‐3,6,11 and 6,6) was investigated using fuming sulfuric acid and solutions of SO 3 in CCl 4 . The sulfonated polymers were soluble in water and insoluble in ethanol. Acid hydrolysis of the polymers and quantitative determination of the amino acids in the hydrolysate showed…
End-breakage is assumed to occur in the fiber bundle which forms a triangle zone between a front roller nip line and a twisting point. On the this assumption a theoretical investigation into end-breakage encountered during spinning has been made together with such factors as tension, yarn irregularity, number of fiber…
A discussion of the factors which have produced the remarkable growth in the use of polyurethane-coated fabrics, and of the factors which influence their properties. The latter includes a description of the various techniques used in the manufacture of PU-coated fabrics and of the way in which variations in manufactur…
Abstract A study has been made of the marked effect of solvent on the stereoregularity of poly (methacrylic acid) prepared by the radical polymerization of methacrylic acid initiated by Co 60 gamma radiation. The specific interaction of the solvent with the monomer and the growing polymer chains, leading to particular…
In the present investigation we attempt to probe the electronic properties of the RCo5 compounds by x‐ray photoelectron spectroscopy studies of SmCo5 and PrCo5 and endeavor to relate the results to the properties of the pure metals and to the picture developed to describe the magnetism of the compounds. The results in…
Ni–Fe–Nb alloys were vacuum melted, annealed in hydrogen atmosphere over the temperature range 950 to 1350°C and then cooled at various rates from a temperature above their order-disorder transformation points. Measurements of magnetic properties, electrical resistivity and hardness for the alloys showed that the valu…
Water-soluble films of cellulose nitrate-nitrite were prepared by dissolving bleached sulfite pulp in a solution of nitrogen dioxide in dimethylformamide (DMF) at room temperature and heating the solution at 70°C for about 3 hr. Their water sorption, fine structure, and electrical properties were measured and compared…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray powder data and unit cell parameters of magnesium chloride hexahydrateCharles A. Sorrell and Roy R. RameyCite this: J. Chem. Eng. Data 1974, 19, 1, 31–32Publication Date (Print):January 1, 1974Publication History Published online1 May 2002Published inissue 1 January 19…
The electron microprobe (EMP) is an electron optical instrument in which compositional and topographic information are obtained from regions ⩽1μm in diameter on a specimen. Photographs of compositional and topographic changes in 1-mm2to 20-μm2 areas on various types of specimens can also be obtained which are striking…
Previously published results on Al-base alloys and steels have shown that accurate prediction of yield stress and ultimate tensile stress (UTS) is possible from hardness data. The present study was undertaken to see if the relationships were also valid for Ti-base alloys. The intention was to permit exploitation of th…
A classification of ferroelectrics with the structure of the tetragonal K-W-bronze type is introduced. A thermodynamic treatment of their dielectric and piezoelectric properties is carried out. The conditions for the existence of a morphothropic phase boundary are discussed for the solid solutions (Pb, Ba)Nb2O6 where…
Activities of lead in liquid copper base alloys have been determined at 1, 130°C by measuring the relative vapor pressures of the melts with Knudsen effusion method.The activity of lead in binary dilute solutions showed remarkable positive deviation from Raoult's law and obeyed Henry's law to at least 0.05 mole fracti…
Complex deoxidation with calcium-silicide was made in pure iron melted with a high frequency furnace. Kinetics of the deoxidation process was analyzed to evaluate the growth rate and the separation rate of the primary inclusion. The compositions of the deoxidation products were determined by X-ray microanalyzer.The ex…
This paper presents a method of evaluating the embrittling effect of hydrogen on metals by measuring the pressure required to burst a small metal disk. The metal disks are clamped, and the system is pressurized until failure occurs. Embrittlement is expressed by the inverse ratio of the rupture pressures of a hydrogen…
The various known effects of the depth of penetration on needled-fabric structure and tensile properties are considered. New experiments are introduced that involve needling the same web by using needles having differing numbers of barbs. These experiments show changes in fabric tenacity related to alterations in barb…
Equilibrium partial oxygen pressure of SrFe 18O 27 ferrite phase was determined between 1250° and 1460°C by flowing CO2-O2 mixed gas or in air. In air this phase is stable in the temperature between 1400° and 1460°C. At 1350°C the partial oxygen pressure ranges from 6×10-2 to 3×10-2 atm, and at 1300°C from 4 × 10-2 to…
Passsivity of the alloy series in solutions is evaluated by means of potentiostatic polarization curves and by measurements of critical pitting potential. Passivity is observed only in alloys of >40% Ni, the actual critical Ni content depending on Cl − concentration, sulfate concentration, and p H. Pitting of Ni‐Cu al…
The electrical characteristics of metal/amorphous Si/crystalline Si (M/a Si/c Si) structures have been investigated and found to depend strongly on whether the M/aSi contact is Ohmic or blocking. Evaporated 1000-Å-thick Cu and Sb films were found to form Ohmic contacts to aSi after proper annealing. With these contact…
The crystal structure of the title compound has been determined from X-ray data measured on a four-circle diffractometer. The crystals are monoclinic, space group P21/c, with a= 13·938, b= 12·882, c= 20·220 Å, β= 112·87°, Z= 4. 3459 Reflections were measured of which 2492 exceeded 2·5σ, and were used in the analysis.…