Materials Literature
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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…
The spectroscopic properties of dye monolayers on silver films were determined by using the technique of attenuated total reflection (ATR). The dyes N,N′-di(methyloctadecyl) squarylium and N,N′-dioctadecyloxacarbocyanine were deposited on silver films by the Langmuir–Blodgett monolayer technique. From a least squares…
Crystal growth and segregation in space were quantitatively investigated in a Bridgman‐type configuration. It was established that the segregation behavior is diffusion controlled without interference from residual gravity, G‐jitter, and surface tension gradients. Radial and longitudinal segregation effects were accou…
Abstract Green (cohesive) strength of Guayule rubber (GR) was determined and compared to that of natural rubber (NR). In the case of GR gum compounds the green strength was shown to be inferior to that of NR gum compounds; however, in the case of black compounds GR green strength was similar to that of NR. Green stren…
With triple-phase relationships treated as linear equations it is possible to refine a set of phases from given initial values. Phases so obtained are better than those found by refining to self-consistency with the tangent formula. An investigation of the radius of convergence of the least-squares refinement process…
Films of halide complexes of silver can be electrodeposited onto, or removed from, transparent indium tin oxide contacts in less than 10 msec using a clear liquid mixture of dimethyl sulfoxide (DMSO), silver halide, alkali metal halide, and bromine or iodine. The solutions do not attack the contacts, even at high volt…
In order to test some of the methods of archaeological bronze conservation, a procedure was perfected that reproduces the structure and composition of original patinas. Then the most common methods of treatment were applied on test samples thus prepared and on archaeological items. This experiment has allowed us to ch…
With high-resolution electron microscopy new crystal structures were found in the binary system of Nb 2 O 5 WO 3 oxides. The compounds are proposed to have the mole ratios 4Nb 2 O 5 . 22WO 3 and 4Nb 2 O 5 . 50WO 3 . The crystal structures are ascribed to intimate intergrowths of two known structures, the ReO 3 type an…
Suitable weighting schemes for use in tangent-formula phase development and refinement are discussed, and a statistically based weighting scheme, which can easily be incorporated in existing computer programs, is proposed. Examples of the use of this method in structure solution and completion are presented for a prev…