Materials Literature
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The rate of in vitro enzymatic degradation of various materials based on collagen has been determined by a novel mechanochemical method, and has been compared with the extent of degradation resulting from subcutaneous implantation in guinea pigs. In vitro data correlate well with in vivo data. It is suggested that the…
Radiative transition probabilities from 3P0, 1I6, 1D2, and 1G4 levels of Tm3+ in glasses were calculated using the matrix elements obtained by intermediate coupling scheme and experimentally obtained intensity parameters. In the absence of self-absorption of fluorescence by the glass host, the fluorescence intensities…
The structures of films of 300Å‐15μ thick formed on (100), (110), and (111)Ni crystal faces at temperatures in the range 500°–800°C were investigated by electron microscopy and x‐ray diffraction. The oxide was initially polycrystalline but rearranged as the oxide thickened to major epitaxial relationships with the met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative chemical analysis of individual microparticles using the electron microprobe. TheoreticalJohn T. Armstrong and Peter R. BuseckCite this: Anal. Chem. 1975, 47, 13, 2178–2192Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Pub…
Magnetic measurements which have been performed on single crystals of the Gd${\mathrm{Co}}_{2}$, Ho${\mathrm{Ni}}_{2}$, and Ho${\mathrm{Co}}_{2}$ Laves phases lead to a quantitative analysis of the crystal-field effects on energy and magnetization anisotropies. The anisotropy due to cobalt is negligible. Crystal-field…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBursting of soap films. VI. Effect of electrolytes and desorption on the shape of aureolesB. R. VijayendranCite this: J. Phys. Chem. 1975, 79, 23, 2501–2508Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Published inissue 1 November 197…
The spectral amplitude damping of Barkhausen noise is determined theoretically and experimentally as a function of distance inside the sample itself. Power spectra for noise amplitude and its time derivative are measured in some steel specimens over a wide frequency range. Some examples of the influence of the sample…
X-ray photoelectron spectra (XPS) are obtained for Mg in MgO using high quality (purity 99.999%) Mg films prepared and oxidized under pressures of 10 -6 ~ 10 -8 torr and measured on an ESCA-36 spectrometer at a pressure of 10 -8 torr. AlKα line source was used for excitation, and the minimum of Au valence band at 5.0…
The potential hazard of occupational exposure to the radiations of 222Rn and its daughters in the natural gas industry is examined. The results of a study of 222Rn concentrations and external radiation fields in nine geographically diverse natural gas processing plants are given, and the results are interpreted in ter…
A technique for producing adherent and well-protected front surface Ag mirrors with an evaporated Al(2)O(3) + SiO(x) overcoat and an evaporated Al(2)O(3) underlayer is described. A thin Al(2)O(3) layer promotes adhesion between the Ag film and its substrate. The optimum thickness of each outer layer necessary to give…
For large reaction rate constants and negligible change in solution composition, the performance of a porous electrode with solid reactants is governed by the ohmic potential drop within the matrix and solution phases. The cell potential changes with time, at constant current, as the reactants are consumed. Equations…
A new algebraic expression has been established for the critical sparkover voltage (CSOV) afair insulation submitted to positive switching impulses. By using the concept of the gap factor, the expression is found to be valid for all practical gap configurations in the distance range 1 to at least 30 m. Based on these…
Scaling of copper heat exchanger tubes has been studied under conditions that promote rapid and severe scaling. Artificially hardened water of high dissolved and suspended solids is recirculated through a heated test section operated at constant steam temperature. The effects of flow velocity, tube diameter, and bulk…
Generalized x-ray scattering factors for atoms (pseudoatoms) in diatomic molecules are determined from a finite multipole expansion of the charge density about each nucleus. The Fourier–Bessel coefficients of the pseudoatom radial density functions are determined by a least squares fit to the molecular form factor. Al…
To provide engineering data useful in the design, manufacture, and operation of seamless pressure vessels, extensive tests have been conducted in hydrogen at pressures ranging from 3000 to 14,000 psi (21 to 97 MN/m2) with precracked specimens of steels having a wide range of mechanical properties. The critical stress-…
Abstract Tetracycline antibiotics continue to play an important role in human and veterinary medicine and in animal nutrition. The classical tetracyclines obtained by fermentation have been supplemented by products of partial synthesis which provide, in particular, the advantages of better pharmacokinetic properties a…
Since the experimental demonstration of the one dimensional metallic state, the study of one dimensional conductors has flourished. Michael Rice outlines recent work in this branch of solid state physics and discusses the 'charge density wave' state
The magnetization and high-field susceptibility of disordered cold-worked Fe 1-c Al c alloys with 0<c<or=0.51 have been determined at 4K in fields up to 150 kOe. The well known initial magnetic behaviour is found to extend to about c approximately=0.25. At higher c values the mean atomic moment decreases faster than a…
Abstract The unit cell of poly(tetramethylene terephthalate) is triclinic with parameters a = 5.96 Å, b = 4.83 Å, c (fiber axis) = 11.62 Å, α = 115.2. β = 99.9, and γ = 111.3°; space group P 1 , calculated crystalline density 1.41 g/cc. The plane of the benzene ring is found to be inclined by about 15° from the fiber…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure-independent method for dissecting contact and dipolar NMR shifts in lanthanide complexes and its use in structure determinationCharles N. Reilley, B. W. Good, and J. F. DesreuxCite this: Anal. Chem. 1975, 47, 13, 2110–2116Publication Date (Print):November 1, 1975Pu…