Materials Literature
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SUMMARY The atomic number dependence of electron backscattering can be used as the basis of a microanalysis technique. The operating procedures and condition for quantitative measurements of specimen atomic number are outlined and an expression relating the accuracy of composition to the atomic number sensitivity has…
Potentiostatically controlled slow strain rate tensile tests were conducted on AISI 1018 mild steel in hot (92°C) caustic solutions of and in a chemically inert cell. Reduction of area was used as a measure of susceptibility to stress corrosion cracking (SCC). The presence of sulfide ions raised the active‐passive tra…
Polarization microscope studies on single crystal samples of pb(Fe1/2 Nb 1/2)o3 [PFN] have been made. Thin platelets (<60μ) show large, homogeneous ferroelectric domains and optical characterization shows PFN is trigonal at room temperature and optically negative. Birefringence measurements between 4.2k and 400k revea…
Nuclear grade production tubing of Alloy 600 was evaluated for stress corrosion cracking (SCC) susceptibility in high purity water at 365, 345, 325, and 290 C. Reverse tube U-bend specimens provided crack initiation data and constant extension rate tests were employed to determine the crack velocities experienced in t…
DISPLACEMENT CASCADES IN POLYATOMIC SOLIDS An analytic calculation is presented which concerns the number of displaced j atoms n kJ(E) by a primary k with an energy E in a polyatomic target. It can be applied in most irradiation cases: neutrons, electrons and ion implantation. Its main limitation rests in its neglect…
The photoelectrochemical behavior of polycrystalline in acetonitrile solutions containing a number of redox couples [ e.g. , phthalonitrile (0/−1), nitrobenzene (0/−1), methyl viologen (+2/+1)] was investigated. The , grown by oxidation of Cu metal by thermal methods or anodization, showed stable behavior under optica…
A study has been made of the lead zirconate-lead iron niobate-lead titanate system to locate ceramic compositions which possess good pyroelectric properties but in which the FR(lt) - FR(HT) transition has been eliminated. The results of this study are reported, together with an assessment of the effects of controlled,…
It is often observed experimentally in complex alloys, such as the austenitic stainless steels, that the largest cavities produced during irradiation are attached to second-phase precipitate particles. One hypothesis that such observations suggest is that the precipitate—matrix interface may assist in the collection o…
A fabrication process has been developed by which Bi4Ti3O12 can be made in ceramic form with high densities (92% theoretical) and substantial grain orientations (>95%). The process consists of molten salt synthesis of platelets of Bi4Ti3O12, tape casting, and conventional sintering. Electrical measurements have verifi…
We report a procedure for the isolation of IIIglc of Salmonella typhimurium, a protein component of the phosphoenolpyruvate-dependent sugar phosphotransferase system. IIIGlc is a soluble protein with a molecular weight of 21,000, as determined by gel filtration and sodium dodecyl sulfate-polyacrylamide gel electrophor…
Structural relaxation in a temperature range from 32 to 62° K glass transition has been investigated, for the first time, for a nearly monodisperse polystyrene using a differential scanning calorimeter and a thermal mechanical analyzer. Low temperature anneals in the vicinity of 320 K stabilize the glassy structure an…
Abstract— Kinetic studies of the hematoporphyrin–sensitized photooxidation of l ‐tryptophan and tryptamine at pH 10 in either homogeneous aqueous solutions or in aqueous dispersions of Triton X–100 and cetyltrimethylammonium bromide micelles indicate that the indole substrates are attacked via a mixed type I (electron…
Abstract In low strain fatigue, cracks often form in persistent slip bands (PSB) in a wide variety of materials. Observations of crack nucleation involving PSB have been made in copper single crystals by careful interferometric studies. The width, length, step height and thus strain localization in the PSBs remain ver…
A comparison of the corrosion and hydrogen uptake resistance of pickled, anodized, and thermally oxidized titanium is made. In general, thermal oxidation appears to offer better protection than the anodized or the pickled condition, thus, offering improved performance in heat exchanger applications as compared to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.alpha.-Silyl aldehydes: preparation and use as stereoselective vinyl cation equivalentsPaul F. Hudrlik and Ashok K. KulkarniCite this: J. Am. Chem. Soc. 1981, 103, 20, 6251–6253Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published i…
Abstract Polyurethanes were synthesized by reaction of a rigid molecule, 3,3′‐dimethyl‐4,4′‐biphenyldiyl diisocyanate (DBD), with flexible molecules, oligoethylene glycols (di‐, tri‐, and tetraethylene glycol) or α,ω‐alkanediols, and some of their thermal properties were studied. Poly(DBD‐oligoethylene glycol)s are am…
Considerable research and development work on the behavior of steam generator tubing materials has been performed during the last ten years. These studies relate mainly to such austenitic alloys as 18-10 stainless steels, Alloys 800, 600, or 690, sometimes with different heat treatments or surface finish. From these s…
We present here the phase diagram of a binary system of dipolar molecules in which five distinct smectic-$A$ regions are put in evidence both by calorimetric and x-ray investigations, four of these smectic-$A$ areas are contiguous and thus several ${S}_{A}\ensuremath{-}{S}_{A}$ transition lines and two triple ${S}_{A}…
When S. pombe is cultured in a medium containing a high concentration of CdCl2 (1 mM), it grows for over 20 h accumulating Cd2+ in the cells. Simultaneously, Cd-binding peptides (Cd-BP1 and -BP2) are synthesized, and accumulated depending on the time after addition of Cd2+ to the culture medium. Apparent molecular wei…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of the 1,4 biradical in the Paterno-Buchi reactionSteven C. Freilich and Kevin S. PetersCite this: J. Am. Chem. Soc. 1981, 103, 20, 6255–6257Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published inissue 1 October 1981http…