Materials Literature
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Samples from the Antarctic and Subantarctic Zones were used for a study of three taxa of the diatom genus Thalassiosira with circumpolar distribution. Most records were from south of the Antarctic Polar Front Zone. T. perpusilla, T. gracilis var. gracilis, T. gracilis var. expecta, stat. nov., have the longer extensio…
This paper is concerned with the accelerated aging of solid insulating materials, as a means of estimating their service lives and identifying superior dielectrics. The assumed failure mechanism is electric treeing. A constant-stress accelerated aging experiment on a transparent epoxy at three voltage levels is descri…
Ying-Kai Fu, Gary E. Kaufman, Morton W. Miller, T. Dan Griffiths, Christopher S. Lange, Modification by Cysteamine of Ultrasound Lethality to Chinese Hamster V-79 Cells, Radiation Research, Vol. 80, No. 3 (Dec., 1979), pp. 575-580
NO) (43% yield) and (i75-C5H5)Cr(N0)2(N02) (35% yield) under identical experimental conditions.It has previously been reported that the carbonyl dimer in benzene reacts with CO (100 atm) to form [(7j5-C5H5)Cr(CO)3]222 and with phosphines to form unisolable products.Both bimetallic compounds are transformed by C1NO in…
The effect of morphology on the thermal expansion behavior, helium permeability, density, and refractive index of alkaline earth silicate glasses has been determined for the calcium, strontium, and barium silicate systems. These data have been used to determine the miscibility limits and the limits of connectivity of…
Abstract Fe substitution for Al in kaolinite (from Venezuelan laterites) is proved by infrared spectroscopy and chemical techniques. The location of Fe in the octahedral sheet is characterized by two absorption bands, at 865–875 and 3607 cm −1 , assigned as δ Al-OH-Fe and v OH respectively. The detection of the 865 cm…
In a study of the system $^{16}\mathrm{O}$+$^{40}\mathrm{Ca}$, the total evaporation-residue cross section has been measured at nine energies, and elastic-scattering angular distributions at five energies, within the range $40 \mathrm{MeV}\ensuremath{\le}{E}_{\mathrm{lab}}\ensuremath{\le}214 \mathrm{MeV}$. The fusion…
X-ray diffraction patterns of single-domain samples of the smectic $F$ phase of terephthalydene-bis-4-$n$-pentylaniline, obtained by melting single crystals of the crystalline phase, have enabled us to collect important information concerning the nature of this phase. The smectic layers are almost uncorrelated, and wi…
Abstract Based on creep and creep‐recovery measurements, the viscoelastic functions [ J ( t ), J r ( t ), J ′(ω), J ″(ω), G ′(ω), G ″(ω), and L (lnτ)] are presented for solutions of a narrow molecular‐weight‐distribution polystyrene in tri‐ m ‐tolyl phosphate in the concentration range of 1% to 100% polymer. For conce…
The conformations of oxidized and reduced isoalloxazine have been examined by a molecular orbital method, PRDDO (partial retention of diatomic differential overlap). The angle theta of fold about the N...N line of the central ring is zero for the planar oxidized form, but a bend of theta = 10 degrees requires only 2 k…
The status of aluminum and iron in 18 Ando soil samples was analyzed by selective dissolution analyses using 0.1 M Na4P2O7, dithionite-citrate, and 0.15 M oxalate-oxalic acid as reagents. The results were correlated with the phosphorus adsorption from NaH2PO4 and Na2HPO4 solutions (<0.2 M). A linear multiple regressio…
Summary EDTA extracts (pH 7.5–10.5) from a Danish sandy loam showed no significant (95% level) increase in amounts of aluminium, calcium, iron, and magnesium between three and nine months' shaking. The amounts were independent of the soil: solution ratio (1:10–1:50), the EDTA concentration (0.01 M–0.2 M), and crushing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of zeolite frameworks by vibrational properties. 2. The double-six-ring in group 4 zeolitesC. S. BlackwellCite this: J. Phys. Chem. 1979, 83, 25, 3257–3261Publication Date (Print):December 1, 1979Publication History Published online1 May 2002Published inissue 1…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Abstract The amino‐terminal telopeptide of the collagen α1(I) chain has a highly conserved sequence. This sequence was analyzed by the Chou‐Fasman criteria, and a folded β‐sheet conformation, including a β‐turn, was predicted. This folded “hairpin” region favors both ionic and hydrophobic intermolecular interactions w…
Novel neutral monomeric five-coordinate manganese and iron dinitrosyl compounds incorporating asymmetric tridentate anionic gallate ligands are described. The crystal structure of the formally "19-electron" iron complex [Me 2 Ga(N 2 C 5 H 7 )(OCH 2 CH 2 NMe 2 )]Fe(NO) 2 has been determined. Crystals of [dimethyl(N,N-d…
Ca8[Al12O24](WO4)2, formerly believed to be cubic, is tetragonal. It forms a superstructure with the usual 9 A unit cell of sodalites.
Previously published chemical and physical data for the Urrbrae loam, and the conclusions drawn from these data concerning profile development, have been appraised. Translocation of clay seems likely to have played a significant role in the development of the Urrbrat: loam, a red-brown earth (calcic rhodoxeralf). Both…
An empirical rigid-projectile analysis has been developed for non- normal impact and penetration into soil and rock. The soil penetration analysis uses Young's S-number as the penetrability index. The rock penetration analysis calculates resistance-to-penetration using density, strength, and Rock Quality Designation.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGroup 3A and 4A substituted AB5 hydridesM. Mendelsohn, D. Gruen, and A. DwightCite this: Inorg. Chem. 1979, 18, 12, 3343–3345Publication Date (Print):December 1, 1979Publication History Published online1 May 2002Published inissue 1 December 1979https://pubs.acs.org/doi/10.10…