Materials Literature
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Immiscibility temperatures of Na 2 O‐B 2 O 3 ‐SiO glasses, with andwithout 1 mol% MoO 3 , additions, were determined and the effect of MoO 3 additions on the 65O°C immiscibility isotherms was established. In addition, immiscibility temperature and phase‐separation morphology of an Na 2 O‐B 2 O 3 ‐SiO 2 glass with prog…
Abstract A lime‐potassium factorial experiment (four K and seven lime treatments) was established on a Coastal Plain soil in 1970. Wide ranges in soil pH and percent Ca, Mg, and K saturation were obtained. Results indicate that the use of the Basic Cation Saturation Ratio Concept for making fertilizer recommendations…
Abstract Injection‐molded tensile bars of unstabilized polypropylene were oven aged at 90°C. After an induction period, tensile elongation decreased catastrophically. During the induction period no evidence of oxidation was observed by infrared reflectance; however, a definite surface etching was noted by electron mic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular mechanics calculations and experimental studies of conformations of .delta.-valerolactoneThomas Philip, Robert L. Cook, Thomas B. Malloy Jr., Norman L. Allinger, Scott Chang, and Young YuhCite this: J. Am. Chem. Soc. 1981, 103, 9, 2151–2156Publication Date (Print):…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Surface energies of solids can be estimated using contact angles of liquids of known surface tension and susceptibilities for polar or acid-base interactions. Interfacial tensions and work of adhesion can be calculated using these estimated energies. There are three circumstances in which performance or bond strengths…
Abstract The thermal decomposition of sodium nitrate and the effects of several oxides, such as silica, titania, zirconia, alumina, and magnesia, on the decomposition were studied up to 900 °C by means of the thermal analysis, gas analysis, and chemical analysis of the reaction products. The reaction of sodium nitrate…
Abstract X-Ray photoelectron spectroscopy was used to reveal the surface states of MgO, CaO, and BaO oxides, which are catalytically active for ethylene hydrogenation. The catalytic activity of CaO exposed to H2O changed with an increase in the temperature of evacuation in a way similar to that of Ca(OH)2 decomposed b…
The history of polyolefins actually began in the 1890s with the synthesis of polymethylene from diazomethane. In the 1930s researchers in England discovered that ethylene at high pressure and in the presence of oxygen polymerized to a high molecular weight resin. Further research there and in the United States at stil…
Owing to the large dipole associated with its nitrile bond, 8OCB (cyano-octyloxybiphenyl) tends to associate as antiparallel pairs. The number of pairs, $N$, increases with increasing mole fraction, ${x}_{6\mathrm{OCB}}$, of a shorter homolog, 6OCB (cyanohexyloxybiphenyl). The stability of the nematic and smectic-$A$…
Phase diagram and X-ray studies of mixtures of 8OCB (cyanooctyloxybiphenyl) and 4O8 (butyloxybenzilidene octylaniline)and 8OCB and 6OCB (cyanohexyloxybiphenyl) demonstrate: 1. 4O8 molecules inhibit the pairing of the 8OCB molecules. One 4O8 molecule is attributed with the breakup of one 8OCB pair. 2. The maximum press…
In an attempt to optimize the chemotherapeutic treatment of mouse tumor Sarcoma 180, liposomes containing cis-dichlorodiammineplatinum(II) (PDD), having transition temperatures of few degrees higher than the rectal temperature of mice, were used in combination with local hyperthermia. The uptake of radioactive PDD by…
The effects of temperature and pH on the reversible dimer-tetramer association of concanavalin A were studied by the high-speed sedimentation equilibrium technique. Both commercial and highly purified preparations of concanavalin A were used. Equilibrium constants were analyzed as a Wyman linked function by using trun…
It is shown that electron–electron interaction changes the frequency and temperature dependences of the a.c. conductivity at low temperatures. The result is that the factor kT in the Austin–Mott formula has to be replaced by e 2/κr ω. The effect is similar to the enhancement of the density of states by electron–hole i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCholesteric liquid crystalline phases based on (acetoxypropyl)celluloseSo-Lan Tseng, Agostino Valente, and Derek G. GrayCite this: Macromolecules 1981, 14, 3, 715–719Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published inissue 1 May 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBromination and chlorination of pyrrole and some reactive 1-substituted pyrrolesH. M. Gilow and D. Edward BurtonCite this: J. Org. Chem. 1981, 46, 11, 2221–2225Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published inissue 1 May 1981https…
Abstract N ‐substituted poly( p ‐phenylene terephthalamide)s (PPTA), such as N ‐alkylated, N ‐aralkylated, and N ‐carboxymethylated poly( p ‐phenylene terephthalamide), were synthesized from PPTA and the corresponding halides by the polymer reaction via the metalation reaction in a solution of sodium methylsulfinylcar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanide ion luminescence probes. Measurement of distance between intrinsic protein fluorophores and bound metal ions: quantitation of energy transfer between tryptophan and terbium(III) or europium(III) in the calcium-binding protein parvalbuminWilliam DeW. Horrocks Jr. a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvated electron structure in glassy matrixesLarry KevanCite this: Acc. Chem. Res. 1981, 14, 5, 138–145Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published inissue 1 May 1981https://pubs.acs.org/doi/10.1021/ar00065a002https://doi.org/1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservations by high-resolution carbon-13 nuclear magnetic resonance of cellulose I related to morphology and crystal structureWilliam L. Earl and D. L. VanderHartCite this: Macromolecules 1981, 14, 3, 570–574Publication Date (Print):May 1, 1981Publication History Published…