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Abstract A small‐angle x‐ray scattering (SAXS) investigation of two linear segmented polyurethanes was carried out to learn about the respective domain structure (morphology). Both urethanes had a hard segment of methylene‐ bis (4)phenyl isocyanate (MDI) and butanediol. These two components comprised 28% by weight of…
A Prussian blue type compound of the stoichiometric composition Mn(CN)3⋅xH2O (x=0.57) is formed as the final product of hydrolysis of Na3[Mn(CN)6] in perchloric acid. IR and visible spectra as well as structural and magnetic data show that it is a mixed valence compound consisting of sixfold N-coordinated Mn(II) and s…
Abstract High resolution imaging by transmission electron microscopy has revealed a mechanism for the weathering of intermediate microcline in a humid, temperate climate. Dissolution of the feldspar begins at the boundary of twinned and untwinned domains and produces circular holes which enlarge to form negative cryst…
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 Yehiam Prior, "Three-dimensional phase matching in four-wave mixing," Appl. Opt. 19, 1741_1-1743 (1980) Export Citation BibTex Endnote (RIS) HTML Plain…
Absolute total electron scattering cross sections for ${\mathrm{N}}_{2}$ from 0.5 to 50 eV have been measured with an estimated uncertainty of \ifmmode\pm\else\textpm\fi{}3% using a transmission time-of-flight method previously described. The results are compared to previous experimental results and to recent calculat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDefining New Directions for Corrosion Research and DevelopmentHarris M. Burte and Charles T. LynchCite this: Ind. Eng. Chem. Prod. Res. Dev. 1980, 19, 2, 166–172Publication Date (Print):June 1, 1980Publication History Published online1 May 2002Published inissue 1 June 1980ht…
Brillouin scattering spectra of NaNO 2 were observed in the incommensurate (antiferroelectric) phase under a precise temperature regulation. In the temperature dependence curve of the Brillouin frequency shift concerned with a longitudinal acoustic mode propagating along the [010] direction, an anomaly was found at th…
Abstract The < 2 µ m fractions of two fluvio-glacial sediments from East Greenland have been analysed chemically and by XRD and Mössbauer spectroscopy. The bulk of each < 2 µ m fraction consists of feldspars and micas (biotite) which are important constituents of the Precambrian igneous and metamorphic rocks of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn investigation into the electrochemical oxidation of some aromatic amines in the room-temperature molten salt system aluminum chloride-butylpyridinium chlorideJ. Robinson and R. A. OsteryoungCite this: J. Am. Chem. Soc. 1980, 102, 13, 4415–4420Publication Date (Print):June…
Summary The crystal structure of synthetic kogarkoite has been determined from X-ray data collected on an automatic diffractometer. The refinement was performed by a least-squares method employing anisotropic thermal parameters. The 3157 reflections with I > 3 σ(I) converged to a conventional R value of 0.033. The…
BaTiS 3 , black single crystals, (a = 675.6(1), c = 579.8(1) pm, Z = 2, space group P6 3 /mmc, 4-circle-diffractometer 1° ≤ θ ≤ 24°, AgKa, R=3.1%) is isotypic with BaNiO 3 , BaVS 3 , BaTaS 3 .
Abstract Poly(ethylene oxide) was irradiated with pulses of 16 MeV electrons (pulse length up to 100 ns) in aqueous and acetonitrile solutions in the absence and presence of oxygen. The change of the light scattering intensity (LSI) after the pulse was monitored. In acetonitrile solution, at a concentration of 2,3 · 1…
Ribonucleoside-diphsophate reductase from Escherichia coli catalyzes release of fluoride, inorganic pyrophosphate, and base from 2'-deoxy-2'-fluoronucleoside diphosphates. This reaction is accompanied by inactivation of the enzyme and an increase in absorbance at 314 nm of the inactivated protein. 2'-Deoxy-2'-fluoroad…
We present our new approach for preserved subcutaneous vascular network (PSVN) skin transplantation. To confirm the revascularization of the grafts, we undertook a microscopic study and found that, because of the rich anascroscopic study and found that, because of the rich anastomotic communication between the recipie…
Abstract The absolute and relative binding energies for the C 1s , O 1s , and F 1s core levels have been determined using x‐ray photoelectron spectroscopy (ESCA) for a series of aliphatic, aromatic, and fluorine‐containing polycarbonates. Comparisons of these experimentally determined, core‐level binding energies with…
Abstract The thermal behavior of α nylon‐12 film cast from a phenol‐ethanol mixture has been studied by differential scanning calorimetry. Polymorphism has been analyzed by x‐ray diffraction. The γ form exhibits a single endothermic melting peak in the thermogram, whereas the α form exhibits double peaks. Samples with…
An Airy stress function has been used to formulate the internal stresses in an isotropic body in terms of the distribution of inelastic strains under the conditions of plane stress and plane strain. Formulation has been first obtained for the stresses in closed forms for an infinite plane containing a rectangular zone…
The structure of 4-aminopyridine hemiperchlorate, C5H6N2⋅1/2HClO4, has been determined from three-dimensional neutron diffraction data. The crystals are monoclinic, space group P21/n, with cell dimensions a=11.224 (7) Å, b=9.325 (6) Å, c=16.631 (9) Å, β=102.72 (3) ° and Z=4. The structure was refined to an R(F02) =0.1…
It will be demonstrated that the determination of pore structures of chemically modified silica gels is possible by simple chromatographic measurements. Silica gels with different mean pore diameters (60–300Å) have been modified by bonding silanes to their surface. Silanes with different alkyl chain lengths and differ…
Abstract Seven kaolins from Georgia (southeastern U.S.A.), ranging from high to low commercial grade, were characterized by X-ray powder diffraction and chemical techniques to establish that the variation in quality was caused by impurities. The Ca and Cs cation-exchange capacities (CEC) varied from 2.67 to 8.17 and f…