Materials Literature
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Measurements are reported to determine the average energy W expended to form an ion pair in air for incident electrons in the energy range from 30 eV to 5 keV. For energies T greater than or equal to 60 eV the standard deviations are lower than 1%. In addition, backscatter coefficients R/sub i/ with respect to the spa…
Flashovers have occurred in Europe on quite lightly polluted insulators, both under heavy rain and during the operation of live-washing systems. To avoid such flashovers a new device, the booster shed, has been developed.
Abstract The chemorheology of polymers prepared by peroxide curing terpolymers of ethylene propylene and diene monomer (EPDM) was studied at 375°F in air. Measurements were conducted on terpolymers containing dicyclopentadiene (DCPD), ethylidene norbornene (ENB) or 1,4‐hexadiene (HD) and also on copolymers. Effects of…
A Fourier-transform method is used to obtain the displacement field for an edge dislocation. The method reproduces known results and produces new solutions that can be compared with those from atomistic models of edge dislocations.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysical studies on benzil. Time resolution of the prompt and delayed emissions and a photokinetic study indicating deactivation of the triplet by reversible exciplex formationTai-Shan Fang, Ronald E. Brown, Chi Lup Kwan, and Lawrence A. SingerCite this: J. Phys. Chem.…
Abstract PVC made by suspension and anionic polymerization was partially dehydrochlorinated by three different methods. In the first one, a solution in THF and in the second one, particles swollen by dioxane were treated with alcoholic KOH at low temperatures. In the third method, a solution of PVC in DMF was heated t…
Kinetic theories of crystallization of polymers do not apply to high supercooling. The thickness of the crystalline lamellae becomes independent of the crystallization temperature and is a characteristic parameter of the polymer. We relate this limiting thickness to the flexibility of the polymer chain in the pure liq…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of trimeric bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)dioxouranium(VI)J. C. Taylor, A. Ekstrom, and C. H. RandallCite this: Inorg. Chem. 1978, 17, 11, 3285–3289Publication Date (Print):November 1, 1978Publication History Published online1…
Of the two formulas previously reported for the compound on the alumina‐rich side of the system La 2 O 3 ‐Al 2 O 3 , present experimental results indicate that LaAl 11 O 18 is correct. This compound melts congruently at ∼2000°C and has a hexagonal structure with lattice parameters of a 0 = 5.561± 0.007 Å and c 0 =22.0…
The line groups are the symmetry groups of stereoregular polymer molecules. For quantum mechanical applications one needs their unitary irreducible representations (reps). All the reps of the line groups whose isogonal point groups are C n , C nv , C nh , S 2n , and D n are constructed. For some line groups the reps a…
High-resolution ac microcalorimetry studies of octyloxycyanobiphenyl, 80CB, reveal a nematic-smetic-$A$ transition consistent with the superfluid analogy as regards the specific-heat exponents, namely $\ensuremath{\alpha}={\ensuremath{\alpha}}^{\ensuremath{'}}\ensuremath{\lesssim}O(log)$. However, the amplitude ratio,…
Stress intensity factors are estimated for three‐dimensional defects which occur in ceramic bodies. The two idealized cases considered are a spherical void with a circumferential crack at its equator stressed by uniaxial tension at infinity and a hemispherical pit at a free surface of a semi‐infinite body also stresse…
A 1500 m thick sheet-like body of ferroaugite syenite is divisible mineralogically into an upper and lower series of syenites. The lower syenites are characterized by well developed igneous layering defined by mafic cumulus minerals. The syenites are saturated to oversaturated and contain as cumulus phases alkali feld…
Physical and chemical properties and the clay mineralogy of Normal and Light-Colored Andosols from Kitakami, Japan were studied. The profiles of both Andosols had features reflecting the repeated falls of tephras with different ages. The Normal Andosol, which is a common Andosol in Japan, showed unique properties, suc…
The complete spectra of valence and core electronic excitations of atactic polystyrene, PS, and poly(2-vinylpyridine), PVP, from 1 to 400 eV were measured by electron energy loss spectroscopy. Energy losses of 80 keV electrons transmitted through 1000 Å thick films were measured with a resolution of 0.1 eV. The spectr…
The anodic oxidation and anodic oxide films of cobalt have been studied in borate buffer solutions in the p H range from 7 to 11. The anodic polarization curve shows the active dissolution, primary passivity, secondary passivity, tertiary passivity, and transpassivation. It is also shown that the anodic oxide film is…
Abstract The hydrophobic surface of oriented poly(propylene) film (OPP) was modified to a hydrophilic one by a novel photo‐grafting procedure using acrylamide (AM) as monomer. A deoxygenated acetone solution containing AM and benzophenone (BP) or other sensitizers was brought into contact with OPP film and the reactio…
Polymeric organosilicon compounds such as hexaphenylcyclo‐trisilazane and methylphenyl polysilane were used to infiltrate porous reaction‐sintered silicon nitride. The in situ thermal decomposition of the infiltrated body under controlled atmosphere and temperature resulted in pronounced changes in the microstructure,…
The chemisorption of CO on clean and oxidized Ir(110) has been investigated under ultra-high vacuum conditions with thermal desorption mass spectrometry, contact potential difference measurements, Auger electron spectroscopy, and LEED. On both surfaces, adsorption is nondissociative under all conditions examined, i.e.…
Evidence for phosphorylation of proteins by protein kinases has been found in Salmonella typhimurium despite previous indications that protein kinase action is absent in prokaryotes. At least four proteins have been found to be phosphorylated. Serine and threonine phosphates have been isolated from acid hydrolysates o…