Materials Literature
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We have selectively deuterated the sidechain of the synthetic polypeptide poly(-γ-benzyl-L-glutamate), PBLG. In magnetically oriented nematic solutions of PBLG, the helical polymer rods are aligned parallel to the field. The Brownian motion of the flexible PBLG sidechain is anisotropic, resulting in quadrupole splitti…
A classification was given of the instabilities appearing in nematic, cholesteric, and smectic liquid crystals exposed to an electric or magnetic field. The basis of the classification is a type of the torque which destabilizes the distribution of molecular axes (director L). It was shown that the explanation of pract…
Article On the Anomalous Self-Diffusion in ß-Zirconium: Temperature Dependence of the Isotope Effect was published on April 1, 1979 in the journal International Journal of Materials Research (volume 70, issue 4).
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Hubert F. A. Tschunko, "Apodization and image contrast," Appl. Opt. 18, 955-956 (1979) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation al…
A study of ($p$,$\mathrm{xn}$) and ($p$,$\mathrm{pxn}$) reactions on $^{79}\mathrm{Br}$ and $^{81}\mathrm{Br}$ was made. The excitation functions were measured in the energy range 10-85 MeV. The excitation functions experimentally obtained were compared with those predicted by intranuclear cascades and two pre-equilib…
Abstract Effect of specimen orientation, heat treatment and applied potential on the stress corrosion susceptibility of magnesium AZ61 (Mg‐6.3% Al‐0.5% Zn‐0.20% Mn) alloy in an aqueous 3.5% NaCl + 2% K 2 CrO 4 solution at room temperature was investigated. Stress corrosion times to failure were measured at different v…
Abstract Methods for the elucidation of the chemical components of polyurethane foams are described. Foam samples of 50 mg were hydrolyzed in aqueous base and the resulting mixture of polyols and polyamines was analyzed by chemical ionization mass spectrometry (CI‐MS) and high‐pressure liquid chromatography (HPLC). Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of aluminum alkoxidesGottfried Brieger, Stephen W. Watson, Donald G. Barar, and Anita L. SheneCite this: J. Org. Chem. 1979, 44, 8, 1340–1342Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Published inissue 1 April 19…
Experimental values are reported for the elastic constants of a number of Schiff's bases. The ratio K33/K11 is found to decrease with increasing alkyl chain length. The results indicate that the elastic constants are related to the molecular dimensions and can be understood qualitatively in terms of the theory of Prie…
Abstract Samples of brucite Mg(OH) 2 containing iron are investigated using 57 Fe Mößbauer spectroscopy. The values of the isomer shift and the quadrupole splitting, measured at room temperature, are IS = 1.15 mm/s relative to metallic iron and QS = 2.94 mm/s. From these values, iron is deduced to be in a high spin di…
The temperature dependency of the dynamic moduli of elasticity of steel and aluminum and copper alloys was investigated experimentally by an ultrasonic-wave method, in the temperature range from —196 to 1000°C. The results are compared with those obtained by the resonant-frequency method and are represented as empiric…
The cyanobiphenyl compounds 5CB (4-cyano-4'- n -pentyl-biphenyl) and the corresponding hexyl, 6CB, and heptyl, 7CB, form a homologous series of nematic liquid crystals. The flow of these liquid crystals in a torsional shear flow apparatus was studied. The shear induced alignment of the director field gives a correspon…
Polymerization of aluminium(III) and iron(III), in mixed solutions of the nitrates, by dialysis against distilled water resulted in polycations having higher Fe/(Fe+Al) mole ratios than those of the starting solutions. A maximum of 25 mole per cent aluminium(III) entered probably into the structure of the po1y[Fe(III)…
Experimental measurements of yarn torque made on statically twisted continuous-filament and staple-fibre yarns are presented. The torque–twist and recovery characteristics of the yarns are interpreted in the light of the theoretical analyses derived in Part I of this series, and it is shown that the torque generated i…
Given a vector field defined in a volume enclosed by a boundary, it is possible to predict the total index of point singularities of the vector field within the volume if it satisfies specified conditions on the boundary. This is made precise in a mathematical theorem, and its applications to physical systems, especia…
The long-term properties of commercially available ECG-electrodes were studied by investigating the parameters: polarization potential, electrical impedance, adhesion, and skin reactions during a period of 7 days. As expected, the most stable polarization potentials were obtained for Ag/AgCl electrodes. Certain simple…
Abstract The kinetics of the pit nucleation in iron in borate buffer solution containing bromides and iodides (0.01 n–0.5 n) has been investigated, and the results have been compared with those obtained for chloride solutions. It has been found that the critical pitting potential, E cp , decreases linearly with the lo…
Measurements of the line shape of the silicon optic mode in boron-implanted ruby-laser-annealed silicon were analyzed assuming a Fano-type interaction between the discrete optic mode and the continuous valence band states. The results yielded a utilization coefficient of 0.89±0.09 for the boron impurities. Measurement…
The heat-ipsulation characteristics of eighteen fire-retardant-treated fabrics; two Nomex fabrics, and a Kynol fabric are examined. Exposure both to flame and to radiation sources is employed. For a low level of radiation exposure, fabric thickness correlates well with protection time. As incident heat flux is increas…
A ferroelastic phase change is observed in P${\mathrm{b}}_{3}$${(\mathrm{P}{\mathrm{O}}_{4})}_{2}$ near 20 kbar at ambient temperature by neutron diffraction. The rhombohedral $\ensuremath{\beta}$ phase above the transition pressure shows a domain-size broadening similar to that observed in the $\ensuremath{\beta}$ ph…