Materials Literature
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A shear‐lag analysis is presented for estimating sliding friction stress at fiber‐matrix interfaces in ceramic‐matrix composites using the single‐fiber push‐out test. The analysis includes an approximate correction for the increased interfacial compression and, therefore, the interfacial friction stress arising from t…
Abstract In alkali chlorides heavily doped with Cu + ions, CuCl microcrystals of different sizes are grown under different heat treatments. Their size and shape are studied using small‐angle X‐ray scattering. A clear correlation is established between the microcrystal size and the blue shift of the exciton luminescenc…
The recent discovery of ``chevron'' structured smectic-C (SC) layers in surface-stabilized ferroelectric liquid-crystal (SSFLC) cells [T. P. Rieker, N. A. Clark, G. S. Smith, D. S. Parmar, E. B. Sirota, and C. R. Safinya, Phys. Rev. Lett. 59, 2568 (1987)] enables the understanding of many commonly observed features of…
The main purpose of this report is to present an analysis of the ballistic behavior of the fragment-simulating projectile (FSP)-nylon cloth system. For a set of V c determinations, plots of V r versus V s can be adequately represented by hyperbolas. The energy lost by an FSP after complete passage through a nylon ball…
Auf äußerst milde Weise stabilisiert ist Borabenzol 3 im matrixisolierten Borabenzol-Stickstoff-Addukt 4, das sich IR-spektroskopisch nachweisen ließ. Generell gilt, daß Boraarene und Boraethene nur zu fassen sind, wenn die Elektronenlücke am Bor durch einen Donor gefüllt ist. 4 bildet sich via 3 bei der Blitzpyrolyse…
Abstract The position and broadening of the Raman band associated with the phosphate symmetric stretching vibration in hydroxyapatite are simulated using a simple inter‐ and intra‐ionic potential. The results are compared with experimental values. This comparison was made as a function of the incorporation of carbonat…
Abstract The influence of flow velocity and particle size on the deposition of suspended alumina particles onto heat transfer surfaces was measured with two fouling probes, namely, a heated cylindrical rod in an annulus and a coiled wire in crossflow. Additionally, the response of the fouled probes to such changes as…
Single-crystal diffraction data have been recorded for a very small crystal of dimensions 8 x 18 × 175 ~rn 3. From these data the structure of piperazine silicate (EU 19) has been determined and refined to R = 0.094 for 490 observed reflections. Data collection for such a crystal has been made practicable by the high…
The solid-state structures of the linear-chain semiconductors K4[Pt2(P2O5H2)4X]•nH2O (X = Cl, Br, I), abbreviated Pt2Cl, Pt2Br, and Pt2I, have been studied. The X-ray crystal structures of Pt2Cl at 300 and 22 K and of Pt2Br at 19 K are reported. These structures show that Pt2Cl is a composite of alternating units of P…
Gradient-index rod lenses with a parabolic-index profile have been fabricated by a double Na-Ag ion-exchange process, and their optical characteristics have been evaluated. The numerical aperture and minimum focused spot diameter of the 2-mm diam rod lens were 0.58 and 2.5 microm for lambda = 0.63 microm, respectively…
Abstract A comparison of the prediction of the theory of rubber elasticity with the experimentally observed variation of the shear storage modulus, G , as a function of crosslink concentration shows that deviations occur when the network strand concentration in diepoxide‐diamine polymers exceeds approximately 1.5 mole…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFT-IR spectra of 90 K films of simple, mixed, and double clathrate hydrates of trimethylene oxide, methyl chloride, carbon dioxide, tetrahydrofuran, and ethylene oxide containing decoupled water-d2Fouad Fleyfel and J. Paul DevlinCite this: J. Phys. Chem. 1988, 92, 3, 631–635…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn important factor determining the significant difference in antiferromagnetic interactions between two homologous (.mu.-alkoxo)(.mu.-pyrazolato-N,N')dicopper(II) complexesYuzo Nishida and Sigeo KidaCite this: Inorg. Chem. 1988, 27, 3, 447–452Publication Date (Print):Februa…
The objectives of this study were to determine the effect of proteins and protein charge on the corrosion of stainless steel. As Zwitter ions, proteins have a positive charge in solutions acidic to their isoelectric point (pI) and a negative charge in solutions basic to the pI. Fretting corrosion rates of stainless-st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of organic side group structures on the properties of poly(organophosphazenes)Harry R. Allcock, Mark S. Connolly, John T. Sisko, and Saman Al-ShaliCite this: Macromolecules 1988, 21, 2, 323–334Publication Date (Print):February 1, 1988Publication History Published onl…
By employing the principles of "activated swelling", monosized, superparamagnetic polymer particles have been prepared ranging in size from 1-100 microns. Both during and after the swelling process, the particles can be modified to meet a series of specific demands making them potentially very interesting for many sep…
In‐Situ Raman Spectroscopy Combined with X‐Ray Photoelectron Spectroscopy and Nuclear Microanalysis for Studies of Anodic Corrosion Film Formation on Fe‐Cr Single Crystals, Thierry, D., Persson, D., Leygraf, C., Delichère, D., Joiret, S., Pallotta, C., Hugot‐Le Goff, A.
Abstract Passive films formed on a Fe 24 Cr alloy in 0.5 M H 2 SO 4 at 0.7 V are characterized by AES depth profiling and XPS. Obtained results and evaluation procedures are critically compared. It is found that correction for electron escape depth significantly improves the accuracy of AES profile data. The use of lo…
We have investigated the temperature and coverage-dependent transformations of the ordered structures of oxygen on Pd(100). The four ordered structures are the chemisorbed c(2×2) and p(2×2) lattices, and the reconstructed p(5×5) and ((5)1/2×(5)1/2)R27° lattices. We present evidence that the p(5×5) reconstruction forms…
Abstract Gas phase chemical modification (GCM) is found to be more preferable as a pretreatment for the XPS surface analysis of polymer materials than the conventional liquid phase treatment because it can circumvent problems such as solvent contamination and swelling. We have tried the quantification of the surface c…