Materials Literature
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Chemical treatments involving ion exchange cause gross onedimensional swelling in water of single crystals of vermiculite minerals. A delicate balance of forces holds the individual silicate layers (10 angstroms thick) parallel to one another although separated by several hundred angstroms. Colloidal dispersions produ…
Abstract Fleming discovered an enzyme which he called lysozyme; it had ‘the power of rapidly dissolving certain bacteria, which is possessed by many animal and vegetable tissues and secretions and to a very marked degree by egg-white' (Fleming 1922). Hen egg-white lysozyme was crystallized by Abraham & Robinson in…
Abstract The chemical evidence for the enzymic activity of lysozyme will be discussed in detail by other speakers at this meeting, but in order to describe our crystallographic studies of the interactions between the enzyme and its substrates it is necessary to summarize briefly what was known about them at the beginn…
The infrared transmission spectra of AgCl, AgBr, and AgI have been measured between 400–30 cm−1 at room temperature and at 143°K. Strong absorptions characteristic of the transverse optic modes were found, together with weak subsidiary absorptions arising from multiphonon combinations. The longitudinal optic modes of…
The kinetic study at different pH values indicates that the monoanion of oxalacetic acid is the major active species which decarboxylates spontaneously. The decarboxylation of the monoanion is favored by nonpolar solvents. Solvent and isotopic effects suggest that the reaction may proceed via an intramolecular hydroge…
A semiphenomenological theory for pure, insulating Bravais lattices is developed to clarify in a unified fashion the problems of sound propagation, sound damping, second sound, and heat conduction. The crystal is described as a gas of interacting quasiparticles coupled to an anisotropic elastic medium. The thermodynam…
A mathematical lattice model was used to compute the kinetic and static aspects of vacancy-cluster nucleation, growth, and dissociation in $\ensuremath{\alpha}$-iron. Persistent attention is paid to the kinetics of changes among metastable configurations as well as the formation of stable configurations. The tetravaca…
We report that the critical thickness for the appearance of stripe domains in evaporated permalloy films depends sensitively on vacuum pressure during evaporation and also that the perpendicular anisotropy constant can be obtained from the critical thickness rather precisely. It was found that the perpendicular anisot…
In order to test thermal-transport theories with data involving readily calculable phonon scattering rates, the thermal conductivity of LiF has been measured between 1 and 100\ifmmode^\circ\else\textdegree\fi{}K, first for a series of isotopically pure crystals with sandblasted surfaces ranging in mean width from 1 to…
In the Boltzmann-equation derivation, second sound is seen as the self-sustained propagation of a temperature wave, assuming the establishment of local equilibrium. Kwok and Martin have shown, by a study of the linear response to a fluctuating displacement field, that second sound occurs as an elementary excitation. I…
This paper discusses the statistical mechanics of ferromagnetic and antiferromagnetic systems in the presence of uniaxial anisotropy, which is included both as anisotropic exchange ${D}_{\mathrm{ij}}S_{i}^{}{}_{}{}^{z}S_{j}^{}{}_{}{}^{z}$ and in the form of single-ion crystal-field terms ${D}_{0}{(S_{i}^{}{}_{}{}^{z})…
A simple treatment of pulsed and steady-state selective-excitation experiments in multilevel systems is given and used to interpret the fluorescence excitation and decay properties of ${\mathrm{Er}}^{3+}$ in La${\mathrm{F}}_{3}$. Fluorescence from eight different excited states was studied. From excitation spectra and…
The change in hyperfine field at a central cation site when the nearest-neighbor cation sites are occupied by magnetic ions is calculated. Two mechanisms dominate this effect: one an orthogonalization of the neighboring magnetic ion's $\ensuremath{\sigma}$ orbitals to the inner $s$ shells of the central cation; the ot…
Measurements have been made of the temperature dependence of the Hall effect in the range 1-300\ifmmode^\circ\else\textdegree\fi{}K, and of the transverse and longitudinal magnetoresistance at low temperatures, in [100] and [111] iron whiskers of high purity (resistance ratios extrapolated to $B=0$ ranged from 242 to…
Abstract The sources of drilling string corrosion are discussed, together with an economic estimate of the magnitude of this problem in our drilling industry. Problems associated with measuring the corrosion rate in drilling fluids under field conditions are reviewed. A technique for making corrosion rate evaluations…
Möglichkeiten zur Verfeinerung von Gußgefüge durch Schwingungsbehandlung der erstarrenden Schmelze. Versuche mit der Erstarrungsbeschallung an Zinn, Zink und Aluminium. Schwingungsbehandlung von Stahl beim Vakuum‐Lichtbogenschmelzen, beim Elektroschlackeschmelzen, beim Stranggießen und beim Sauerstoffaufblas‐Verfahren.
For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology.
Dimethyl silicone imparted wrinkle recovery values of 250-285° to various types of fabric when the silicone was cross-linked as a film on the cotton. To enhance this effect, a small amount of cellulose cross-linking was carried out using dihydroxydimethylol ethyleneurea without added metal salt catalysts. Conditioned…
Abstract The dielectric behavior of different polar high polymers at ultra‐high frequencies has been investigated by means of a dielectrometer, suitably modified to permit measurements at different temperatures. Experimental measurements were made at about 9 × 10 9 cps over the temperature range of −150 to 200°C. for…
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 R. C. Vehse, E. T. Arakawa, and J. L. Stanford, "Normal-Incidence Reflectance of Aluminum Films in the Wavelength Region 800–2000 Å*," J. Opt. Soc. Am.…