Materials Literature
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The complete set of ten third-order elastic constants of magnesium has been determined from measurements of the hydrostatic-pressure and uniaxial-compression derivatives of natural sound velocities using an ultrasonic pulse-superposition technique. The specimen was neutron irradiated with an integrated exposure of 2 \…
Calculations of the core contributions to the Compton profiles for lithium ($1{s}^{2}$), carbon ($1{s}^{2}$), and aluminum ($2{s}^{2}2{p}^{6}$) were made employing excited-state one-electron continuum wave functions evaluated in the ground-state Hartree-Fock-Slater potential of the nucleus and remaining electrons. Goo…
Abstract : The theory of dislocations in a continuum is developed. Methods are presented for solving boundary value problems for stresses and displacements due to distributions of dislocations. Examples are presented of the application of the theory to crystalline materials.
Measurements were made by x-ray photoelectron spectroscopy of the $4f$ level energies in Au and the $3d$ level energies in Ag with these elements in several forms: pure metals, Au-Ag alloys, Au${\mathrm{Al}}_{2}$, and Au${\mathrm{Ga}}_{2}$. Only very small core-level energy shifts are seen, even though existing M\"oss…
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…