Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBragg gratings in an acrylate polymer consisting of periodic polymer-dispersed liquid-crystal planesR. L. Sutherland, L. V. Natarajan, V. P. Tondiglia, and T. J. BunningCite this: Chem. Mater. 1993, 5, 10, 1533–1538Publication Date (Print):October 1, 1993Publication History…
The microbial degradation of tensile test pieces made of poly(3-hydroxybutyrate) [P(3HB)] or a copolymer of 90% 3-hydroxybutyric acid and 10% 3-hydroxyvaleric acid was studied in soils incubated at a constant temperature of 15, 28, or 40 degrees C for up to 200 days. In addition, hydrolytic degradation in sterile buff…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrin sponges: conservative of host structure in over 200 porphyrin-based lattice clathratesMarianne P. Byrn, Carol J. Curtis, Yu Hsiou, Saeed I. Khan, Philip A. Sawin, S. Kathleen Tendick, Aris Terzis, and Charles E. StrouseCite this: J. Am. Chem. Soc. 1993, 115, 21, 94…
Ansrnlcr Quantitative phase analysis of a number of multicomponent standard and natural mineral mixtures has been done using an adaptation of the Rietveld method. Binary mixtures (most 50:50 by weight) of corundum with quartz, hematite, ilmenite, magnetite, biotite, analcime, mordenite, or clinoptilolite were analyzed…
A discussion is given of the amount of information present in x-ray-absorption fine-structure spectra. It is shown that the usual formulations underestimate the degrees of freedom by at least one.Received 1 June 1993DOI:https://doi.org/10.1103/PhysRevB.48.9825©1993 American Physical Society
Macropore formation in n‐type silicon is a self‐adjusting phenomenon characterized by a specific current density at the pore tip. At this specific current density, the dissolution reaction changes from the charge‐transfer‐limited to the mass‐transfer‐limited regime. The passivation of the pore walls in hydrofluoric ac…
Abstract The thickest layer (L2) of the egg capsule wall of the dogfish, Scyliorhinus Canicula, is constructed largely from highly ordered collagen fibrils (Knight & Hunt 1976). This collagen is stored and secreted by the nidamental gland and passes through an extraordinary series of ordered phases, m any of which…
Several proprietary discharge detectors are available that are suitable for measuring the magnitudes of the partial discharges in plants such as high voltage metalclad switchgear. Their main disadvantages are the high capital cost of the test equipment and the complexity of the testing procedure. When performing such…
The side chains of the interacting pair Asp237(helix VII)-Lys358(helix XI) or Asp240(helix VII)-Lys319(helix X) in the lactose permease of Escherichia coli were extended by replacement with Glu and/or Arg or by site-specific derivatization of single-Cys replacement mutants. Iodoacetic acid was used to carboxymethylate…
Partial discharge activity is both a symptom of degradation in the solid insulating systems of power plants-irrespective of the causative stresses-and a stress mechanism which causes degradation. It can therefore be readily appreciated why the detection, location and interpretation of pd activity is an attractive tech…
Electron Compton scattering from solids (ECOSS) is a technique for obtaining the momentum density distributions of charge carriers in a solid on a scale of mu m or less. The authors discuss the possibilities and the problems of this experimental technique, which uses a conventional transmission electron microscope (CT…
We report a study on gamma irradiated porous Si. The electron paramagnetic resonance study on porous Si irradiated by gamma rays shows that the observed signals come from an intrinsic defect, a Si dangling bond, at the interface of Si/SiOx in porous Si. The photoluminescence measurements show that the gamma irradiatio…
A self-consistent mode coupling model for supercooled fluids is derived from fluctuating nonlinear hydrodynamics (extended to short wavelengths) with attention to detailed balance constraints. The sharp glass transition predicted by mode coupling models based only on pressure nonlinearities does not occur here. Instea…
We have measured the absolute structure factor of liquid water over the wave-number range 0.05k0.30 A${\mathrm{\r{}}}^{\mathrm{\ensuremath{-}}1}$ and temperature range -34T25 \ifmmode^\circ\else\textdegree\fi{}C with small-angle x-ray scattering. The correlation lengths of density fluctuations are small and change ver…
Oriented diamond nuclei prepared by bias-enhanced microwave plasma chemical vapor deposition on β-SiC and Si were characterized by x-ray texture diffractometry. In both cases, x-ray pole figures reveal an epitaxial relation between the orientation of diamond nuclei and the substrate. However, the angular spread of the…
Diblock copolymers in a selective solvent often assemble into spherical micelles. These micelles demonstrate long range order at moderate polymer concentrations. We explore the nature of the disorder-order transition in micellar suspensions through small angle x-ray diffraction studies. The phase behavior includes bod…
We compare reported compositions of a-C:H films in a ternary phase diagram. It is assumed that the films comprised three phases: sp3 hybridized carbon, sp2 hybridized carbon and hydrogen. The data are found to split into two well-separated groups. This separation depends on the method used to measure the sp3/sp2 ratio…
Low-frequency Raman spectra of strong and fragile glass forming liquids were measured in a wide temperature range. From an analysis of the spectra and literature data it is found that the main difference in the dynamic structure factor is the ratio of vibrational to relaxational contributions: The stronger the glass f…
This is an extensively illustrated laboratory manual of transmission electron microscopy techniques for the technician, graduate student, or researcher. Chapters begin with a general discussion, move on to the chemicals and equipment required for the method being described and conclude with a step-by-step presentation…
A demonstration imaging spectrometer using a liquid crystal tunable filter (LCTF) was built and tested on a hot air balloon platform. The LCTF is a tunable polarization interference or Lyot filter. The LCTF enables a small, light weight, low power, band sequential imaging spectrometer design. An overview of the protot…