Materials Literature
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Ultrasonic absorption measurements made in the nematic liquid crystals $p$-azoxyanisole and $p$-azoxyphenetole, which were oriented by an external magnetic field, are used to calculate anisotropic viscosity coefficients. Values of $\frac{\ensuremath{\alpha}}{{f}^{2}}$ and the anisotropy of $\frac{\ensuremath{\alpha}}{…
A method is presented for calculating the temperature increase that results from heat generation by radioactive wastes placed in a subsurface cavity. Cavities of spherical, cylindrical, and other shapes are considered. The method takes into account the disintegration energy released by the various isotopes present in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeriodate oxidations of enamines. I. Oxidation of adenosine 5'-monophosphate in the presence of methylamineD. H. RammlerCite this: Biochemistry 1971, 10, 25, 4699–4705Publication Date (Print):December 7, 1971Publication History Published online1 May 2002Published inissue 7 D…
The density of states of the valence and conduction bands of Si and Ge are discussed using a simple tight-binding Hamiltonian. It is shown that certain features of the density of states for the case of the diamond structure are related to the short-range order and hence should be retained in the amorphous state while…
The current-driven ion-sound instability is investigated by two-dimensional computer experiments. It is found that, in contrast to the one-dimensional case, the instability produces an anomalous resistivity.
The complete valence band in amorphous Si${\mathrm{O}}_{2}$ has been examined by photoelectron spectroscopy at photon energies of 21.2, 26.9, 40.8, and 1486.6 eV. The spectra show emission from an 11.2-eV-wide $p$-derived valence band and from the oxygen $2s$ level at 20.2 eV below the valence-band edge. Four pieces o…
The anharmonic Raman process, which was shown by Van Kranendonk and Walker to be important in the case of nuclear quadrupolar relaxation, is shown here to be of sufficient magnitude to explain the Raman relaxation rates of the paramagnetic ions ${\mathrm{Cr}}^{3+}$ and ${\mathrm{Ni}}^{2+}$ in MgO. This new relaxation…
A gas compressor was built for oxygen. For safety, water was chosen as a pressure transmitting medium. Oxygen gas compressed by high pressure water was led into a reactor. In the reactor, syntheses of oxides of transition metals were conducted in the range of temperature and pressure up to 600°C and 2000 bars. One of…
High-quality EuO films with properties similar to bulk EuO have been deposited by sputtering a polycrystalline EuO target in an ultrahigh-vacuum sputtering system. In addition, Eu-rich EuO films with enhanced ferromagnetic properties have been sputter deposited, but with considerable difficulty. The difficulty is caus…
Supernatants from cultures of green high-temperature algae, Chlorella 7-11-05 and Stichococcus 6-17-35, were used to obtain titration curves and to calculate buffer indexes (β). It was generally observed that the peak of buffering activity in growing cultures shifted to the pH characteristic of the pK of the newly gen…
The optical properties of the rare-earth dopant neodynium in crystal and glass hosts of the identical chemical composition ${\mathrm{Ba}}_{2}$Mg${\mathrm{Ge}}_{2}$${\mathrm{O}}_{7}$ have been studied on a comparative basis. This technique offers many advantages. Concentration quenching of emission is seen to commence…
Extrinsic conductivity on plastically deformed germanium containing predominantly screw dislocation arrays were investigated. The dislocations were introduced by twisting cylinders of anitmony-doped n-type germanium and the dislocation density was determined by the etch pit method. Dark conductivity and both transient…
Abstract Experimental PVT data have been obtained for isopropyl alcohol by the use of a constant‐volume apparatus. Smoothed values of the compressibility factor are presented for temperatures from 200° to 300°C. and pressures from 1,000 to 8,000 lb./sq. in. The experimental data are estimated to be accurate to within…
The Néel theory of the approach to saturation in inhomogeneous magnetic materials is critically reviewed. It is found that the theory is rigorously applicable when the local saturation magnetization differs only slightly from its spatial average, but that this condition is not satisfied in porous materials or in mater…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular quenching of the excited singlets of phenyl .omega.-dialkylaminoalkyl ketones. Singlet state type II photoelimination of .alpha.-dimethylaminoacetophenonePeter J. Wagner and Thomas JellinekCite this: J. Am. Chem. Soc. 1971, 93, 26, 7328–7330Publication Date (P…
Energy and charge transport by secondary electrons across interfaces between gamma irradiated materials can be important for accurate predictions of radiation effects. In order to measure these charge transport effects air ionization and secondary electron emission currents were observed in a multiple cavity aluminum…
D.C. electric-field-induced pitch contraction and a simultaneous transition from the cholesteric plane texture to the focal conic texture were studied microsopically in a mixture of 20% cholesteryl chloride and 80% cholesteryl oleyl carbonate. The texture change is preceded by the formation of a periodic pattern in th…
Records of occurrence of 12 rare species of the genus Amphora in the Laurentian Great Lakes are given. Five of the taxa discussed are reported as new and five are reported for the first time from North America. Presently known distribution and abundance of these entities is presented and apparent similarities with the…
Gassy and degassed aqueous solutions of DNA were treated ultrasonically while monitoring the field for discrete cavitation events. At irradiation intensities greater than about 500 W/cm2, transient cavitation is shown to be responsible for the observed reduction in molecular weight. At intensities of 200 to 288 W/cm2,…
Abstract Previous studies of the line profiles of the basal reflections of microcrystalline muscovites were refined by an adaptation of the method developed by Maire and Méring. In order to evaluate the variation of interlayer spacings, the method required only relative values of Fourier coefficients, without the corr…