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Abstract Pressure relief venting of a runway reaction with gas generation is examined in terms of the overall system response and the associated venting requirement. This article presents an exact formulation as well as an approximate analytical approach. The latter is shown to be particularly useful in vent‐sizing ap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTechnetium complexes of tripodal oxygen donor ligandsJohn Anthony Thomas and Alan DavisonCite this: Inorg. Chem. 1992, 31, 10, 1976–1978Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pubs.acs.org/doi/10.1…
Abstract The reported Raman spectra of the tetragonal [lead chlorofluoride‐type structure, D ‐P4/nmm (ITC No. 129)] lanthanide oxychlorides are inconsistent. Nuclear site symmetry analysis predicts six Raman bands. Five peaks are consistently observed, whereas the sixth remains controversial. Also, two different sets…
Abstract Continuous fertilization with NH 4 and phosphate fertilizers often has profound effects on the chemistry of soils. The resulting decreased pH and increased orthophosphate activities can impact the solid‐ and solution‐phase equilibria. The objective of this study was to determine the effect of long‐term fertil…
ABSTRACT This paper reviews: (1) Navy sponsorship of pitch graphite fiber development, and (2) assesses the impact of the high thermal conductivity fibers on future Navy applications. Navy exploratory development programs (6.2) have revealed potential applications in advanced systems for graphite fiber reinforced comp…
Ti-tritides containing about 10% (H/M) tritium were aged at 300 and 550[ddot]C for several weeks and then inspected for 3He bubble formation by transmission electron microscopy. Micrographs of α-phase regions aged at 300[ddot]C displayed platelike He precipitates on (0001) habit planes accompanied by very strong contr…
Two methods are developed for the theoretical determination of a conformational path between two well-documented forms, a closed form and the open form [Remington et al. (1982) J. Mol. Biol. 158, 111-152] of pig heart citrate synthase, a dimeric enzyme of 2 x 437 residues. The first method uses the minimization of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of interphases between PMDA/4-BDAF polyimides and silver substrates using surface-enhanced Raman scattering and reflection-absorption infrared spectroscopyW. H. Tsai, F. J. Boerio, and K. M. JacksonCite this: Langmuir 1992, 8, 5, 1443–1450Publication Date (P…
Conventional tiling models of quasicrystals imply the existence of two or more elementary cells (tiles). A new approach is proposed that allows a quasicrystal to be thought of as a random assembly of identical interpenetrating atomic clusters. This model is shown to be equivalent to a decagonal binary tiling. On apply…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron reduction of chromium(III) porphyrins: formation of chromium(II) porphyrins or chromium(III) porphyrin .pi.-radical anionsDirk M. Guldi, P. Hambright, D. Lexa, P. Neta, and J. M. SaveantCite this: J. Phys. Chem. 1992, 96, 11, 4459–4466Publication Date (Print):Ma…
We investigated the design of two broadband hybrid diffractive-refractive optical systems, a landscape lens, and a Schmidt telescope. The systems were achromatized by using the characteristically large negative dispersion of kinoforms. In the scalar wave regime kinoforms can approach 100% efficiency but only for one o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMinimal surfaces and Winsor III microemulsionsStig Ljunggren and Jan Christer ErikssonCite this: Langmuir 1992, 8, 5, 1300–1306Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pubs.acs.org/doi/10.1021/la000…
The positron annihilation technique was adopted to study the defect structure of the dielectric ceramics with the nominal composition (Sr1−xBi2/3x) TiO3, where x was 0, 0.06, 0.11, 0.16, 0.21, 0.25, 0.29, 0.33, 0.36, 0.40, and 0.43, respectively. A two phase field occurs above 0.36. The results show that the dielectri…
Abstract A series of benzo-substituted phthalocyanine-Zn complexes was isolated from a mixed product of two nitriles(o-phthalonitrile and 2,3-dicyanonaphthalene) and metal salt by chromatographic techniques. The UV-Visible absorption spectra of these compounds showed a schematic variation with the mode of substitution…
Abstract Formulae are presented for estimation of the statistical uncertainties (standard deviations) associated with the peak heights and integrated intensities (areas) required for elemental quantification in XPS in situations where peak overlap is not significant. The situation arising when curve‐resolution procedu…
ABSTRACT Particle surface temperatures were measured by liquid crystals that allowed unrestricted motion of the monitored particles. Liquid‐particle film heat transfer coefficients (h p ) were considerably higher than published values which were determined with particles attached to thermocouple wires. In general, as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(arylene sulfides) by cationic oxidative polymerization of diaryl disulfidesKimihisa Yamamoto, Mitsutoshi Jikei, Junya Katoh, Hiroyuki Nishide, and Eishun TsuchidaCite this: Macromolecules 1992, 25, 10, 2698–2704Publication Date (Print):May 1, 1992Publicatio…
Ninety-eight slides from eight lakes in the Adirondack Mountains of the northeastern United States have been distributed as an exsiccata to 16 museums and collections around the world. The slides were prepared from sediment cores representing microfloras dating from 1830 to 1983. Lake size varies from small ponds (1.0…
Results of in situ electron spin resonance, optical absorption, and Fourier transform infrared spectroscopic studies during electrochemical doping and undoping processes of viologen functionalized poly (3-alkylthiophenes) are reported. Effects of the functional group on the electronic properties of the polythiophene b…
Two new methods to synthesize macrocyclic β-keto lactones have been developed. The first involves the synthesis of ω-halo-β-keto esters and an intramolecular alkylation of the dianions to these compounds. The reaction is complicated by elimination in the small and medium ring systems and by difficulties in purifying t…