Materials Literature
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Abstract Polypropylene films were produced by solidification during high‐rate (>10 4 s −1 ) melt drawing. Small‐angle x‐ray scattering (SAXS) data were collected during interruptions of the annealing of these films. Fibrillar crystallization took place during the melt‐drawing process. The fibrils exhibit an axial d…
Intrinsic demagnetization curves and the temperature dependence of specific magnetization states were measured with a dc magnetometer on four types of sintered rare-earth-cobalt permanent magnets at temperatures from 300 to 1000 K. All magnetic properties vary reversibly with temperatures up to limits of 650–850 K, de…
Abstract Middle Pennsylvanian fossils from the Buckhorn Asphalt quarry of Southern Oklahoma are unusual in that early sealing by tar has preserved many of their original textural and mineralogic features and those of the earliest stages of diagenesis. Echinoderm fragments collected from this locality axe well preserve…
The ternary Ce2Co17-based systems in which Co is replaced by Ti, V, Cr, Mn, Fe, Cu, Zr, and Hf have been studied to ascertain the effect of substitution on their magnetic and crystallographic properties. X-ray diffraction experiments indicate that Mn and Fe stabilize the rhombohedral Th2Zn17 structure, while Ti, V, Cr…
Electrical and optical properties of reactively sputtered tungsten oxide films have been investigated in relation to the oxygen concentration in sputtering atmosphere. The films with 5200–6600 Å thick were prepared under a constant pressure of 5×10−3 Torr using a mixture of Ar and 4–50% O2. Electrical resistivity and…
The highly accurate core level binding energies measured by Fermi-level Referenced ESCA (FRESCA) have been compared with those of Auger Electron APS (AEAPS) and XPS. The FRESCA and AEAPS measurements directly measured energies with respect to the Fermi-level and are not subject to the instrumental uncertainties charac…
Abstract The glass transition temperatures for a series of high-1,4 linear and star-branched polyisoprenes have been measured by differential scanning calorimetry. The Fox-Flory relation for the linear polyisoprenes was found to be T g =T g ∞ −1.76×10 4 M n −1 . The influence of hydroxyl groups on T g was also examine…
Equations of motion of the Landau-Lifshitz type are used together with the free-energy expression of an earlier publication [D. L. Fox et al., Phys. Rev. B 21, 2926 (1980)] to derive expressions for dynamic phenomena in the low-temperature phase of BaMn${\mathrm{F}}_{4}$. The magnon frequency decreases and the optical…
The crystal structures of (NH 4 ) 2 ZnCl 4 at 418 K (Phase I), 333 K (Phase II) and 298 K (Phase III, antiferroelectric) were determined from X-ray diffraction data, and were compared with that at 223 K (Phase IV, ferroelectric). The space groups and final discrepancy factors are P m c n and 0.052 at 418 K, P c 2 1 n…
A thin, amorphous LiAlF4 film, with lithium ion conductivity of 1×10−4 S/m at 25 °C, has been prepared by vacuum evaporation. Utilizing this thin film as a solid electrolyte, an ITO/WO3/LiAlF4/LiIn overlayer has been constructed (ITO: indium-tin-oxide). For it, the electrochromism of WO3 due to lithium ion injection w…
ABSTRACT Rhoicosphenia Grun. has been placed by some authors in the monoraphid group with Achnanthes Bory and Cocconeis Ehrenb., and by others near Gomphonema Ehrenb. In order to clarify the systematic position of the genus, the morphology and anatomy of the vegetative cells of Rh. curvata (Kütz.) Grun. were investiga…
The effect of the strong Hund coupling on the magnetic property of the ground stateis studied based on the double exchange model. For one dimensional chains the ground state is proved to have the maximum total spin. The effect of the Pauli principle is shown to destroy the ferromagnetic ground state by numerical studi…
We have enlarged the theory of ferromagnetic domain wall pinning by defects to include large as well as small deviations of the magnetic anisotropy, magnetization, and/or magnetic exchange energy of the defect, from the host material for all values of the defect width. In particular, we obtain results for the coercive…
Discusses the singularities and approximations that occur in the charge-density method of solving electrostatic problems in which space-charge is absent (Laplace's equation) or present (Poisson's equation). Describes the application of the method to electrostatic lenses in general and to the particular case of a high-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAluminum atom-ethylene and aluminum atom-acetylene complexes: matrix isolation electron spin resonance studyPaul H. KasaiCite this: J. Am. Chem. Soc. 1982, 104, 5, 1165–1172Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Published inissue…
Electromigration in thin films has been identified as one of the primary failure mechanisms limiting the reliability of film interconnections. Most of the electromigration testing has been carried out with Al and Al-alloy film conductors as they happen to be most widely used on integrated circuits. A general expressio…
We use a rigorous formalism for lossy lamellar gratings to establish the validity of the quasistatic approximation for this structure in the limit as its period d becomes much finer than the wavelength u of incident light. In the quasistatic limit, the grating behaves like a uniaxial film in its interaction light, its…
Abstract The chemistry and energetics of the Criegee intermediate, a primary product of the ozonolysis of alkenes, are discussed in terms of recent ab ‐ initio calculations and laboratory studies. The experimental observations in O 3 –alkene systems can be rationalized on the basis of a general mechanism: magnified im…
The magnetic properties of amorphous ${\mathrm{Mg}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}$ alloys were studied by means of magnetization measurements and the $^{57}\mathrm{Fe}$ M\"ossbauer effect. It was found that the apparent decrease with $x$ of the Fe moment derived from magnetization measurements is due to deviatio…
The setting reaction of six dental materials has been studied by using a water dilatometer at 25 degrees and 37 degrees C. Where there is no water absorption during the test, the method gives reproducible values of the setting shrinkage and at the same time shows a clear physical picture of the entire setting process.…