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Preparation of Polymer Hybrids of the SiO<sub>2</sub>-PVA or SiO<sub>2</sub>-PEG System and Porous Materials Made from the Hybrid Gels
Apparently homogeneous transparent gels (polymer hybrid gels) were prepared from TEOS and PVA or PEG. IR spectra and DTA curves for the gels and pore characteristics of porous materials obtained by heating gels were examined. PVA incorporated into a gel seemd to be bound to the surrounding _??_Si-O-Si_??_ network more…
Electrochemical behavior of Al3Fe intermetallic compound.
The cathodic processes localized to iron rich intermetallic phases on commercial aluminum alloys during corrosion in neutral chloride environments are controlled by the structural and compositional changes occurring on these phases in a locally stable alkaline environment. These phenomena are investigated by conventio…
Radiation Induced Microstructural Evolution in Ferritic/Martensitic Steels
R & D of ferritic/martensitic steels as structural materials for fusion reactor is one of the most important issues of fusion technology. The efforts to characterize microstructural evolution under irradiation in the conventional Fe–Cr–Mo steels as well as newly developed Fe–Cr–Mn or Fe–Cr–W low activation ferritic/ma…
Appearance of internal bias field in ferroelectric growth process
The growth regularities of the internal bias field Eb formation have been investigated in pure triglycine sulphate crystals, as well as in crystals doped with chromium or α-alanine. All crystals were grown in the ferrophase from the seed of the pivot form oriented by its axis along the non-polar crystal axis Z. It was…
Porphyric insecticides. IV: Structure‐activity study of substituted phenanthrolines
Abstract The porphyric‐insecticide‐modulating activities of 1,10‐phenanthroline and eight of its analogs were investigated. The insecticidal efficacy of these compounds was closely associated with their ability to enhance the conversion of exogenous δ‐aminolevulinic acid (ALA) to protoporphyrin IX (Proto). As observed…
Study of diffusion in films on planar substrates by ellipsometry
A theory of diffusion in films of variable thickness is developed. Approximations for the short-time and long-time dependences of solvent concentration in the film are derived. Diffusion in thin films has been investigated by ellipsometry. The diffusion coefficients for different temperatures were calculated using asy…
Charting the Links between Material Selection and Elemental Form in Structural Design
The rational design of engineering structures as an optimization process is discussed, highlighting the desirability of identifying the influence of material selection on form at an early stage. Procedures for material selection developed at Cambridge University are examined, then extended to incorporate the manufactu…
Crystal structure of cerium scandium trisulfide, CeScS3
Cristallisation dans Pnma avec a=7,162, b=9,566 et c=6,5029 A, Z=4; affinement jusqu'a R=0,025.
An Assessment of the Flammability Hazard of Several Corrosion Resistant Metal Alloys
The Space Shuttle launch environment at the John F. Kennedy Space Center is extremely corrosive. Recent corrosion studies have identified Hastelloy B-2, Haynes Alloy C-230, Hastelloy C-22, Hastelloy C-276, Hastelloy G-30, and Inconel 625 as being very resistant to this launch environment. Since several corrosion relat…
Electron microscopic study of the structure and dissolution behavior of porous anodic films formed on aluminum.
The structure and the dissolution behavior of porous anodic films formed on aluminum have been studied by electron microscopy with various techniques which include SEM, TEM, replica, ultramicrotomy and ion-thinning methods. Cell walls of films formed in oxalic acid were dissolved uniformly, whereas micro-pores in cell…
Seams of Different Ply Properties. Part II: Seam Strength
In the first part of this series, the effects of differences in ply properties and of the mean properties of the plies on seam appearance were examined and discussed. The present part is concerned with the effects of the same factors on seam strength; it also discusses factors affecting fabric strength along different…
INDUSTRIAL FIBRES: A TECHNICAL AND COMMERCIAL REVIEW
Properties, costs and availabilities are reviewed for a number of raw materials in current use, or having potential use, as replacements for asbestos fibre. These include glass fibres and mineral wools; ceramic or refractory fibres; a number of minerals in fibrous or particulate form; and some specific synthetic and n…
Scattering of an Arbitrary Plane Wave by an Infinite Strip Grating Loaded with a Pair of Dielectric Slabs
An accurate numerical solution for the electromagnetic scattering from an infinite strip grating is presented, where the strips are loaded with a symmetrical pair of dielectric slabs. The direction of propagation and the polarization of the incident plane wave are arbitrary. The boundary value problem is reduced to a…
Structural Analysis of Na2O-B2O3 Melts by Pulsed Neutron Total Scattering Method and Molecular Dynamics Simulation.
In order to obtain direct information on the structure of sodium borate melts which are of use in metallurgical processes, pulsed neutron total scattering measurements have been carried out on 10mol%Na2O- and 30mol%Na2O-B2O3 melts at 1073 K, in addition to the previous measurement on pure B2O3 melt. Molecular dynamics…
Investigation of the Relative Affinity of Doxorubicin for Neutral and Negatively Charged Particulate Carriers
Microparticles produced from polyisobutylcyano-acrylate (IBCA) and polyglutaraldehyde (PGA) were investigated for their relative affinity and surface characteristics using doxorubicin (DOX) as a model drug. IBCA microparticles have been reported to exhibit neutral hydrophobic surface features, whereas PGA microparticl…
Phonon Mechanisms of Intrinsic Dielectric Loss in Crystals
Most crystalline solids have phonon spectra that consist of rather sharp lines, i. e. the maximum frequencies are much greater than the half-width of them or in other words, in these crystals, the relative damping of phonons is small. The theory of intrinsic dielectric loss in such crystals is well developed. The deta…
Evaluation of High-Performance Protective Coatings by Electrochemical Impedance and Chronoamperometry
Coatings evaluation methodologies using electrochemical impedance spectroscopy (EIS) and chronoamperometry are described for high-performance corrosion protective coating systems. Three types of coating systems were studied: (1) fusion-bonded epoxy, (2) a marine-service epoxy, and (3) a polyimide used in electronics a…
Phase Instability and Void Formation in Neutron-Irradiated Fe–Cr–Mn–Ni Alloys
A series of Fe–13Cr–15Mn alloys with different nickel levels of 0–15% have been examined by transmission electron microscopy and X-ray microanalysis following irradiation to 17–25 dpa at 693–823 K. All specimens were found to have developed typical features of radiation damage at high temperature; voids, dislocations…
Effects of Y<sub>2</sub>O<sub>3</sub> Addition on the Sinterability and Microstructure of Mullite (Part 2)
The phenomena in the sintering process of Y2O3-added mullite ceramics and the crystallization behavior of liquid phase in sintered bodies were studied using differential thermal analysis, X-ray powder diffractometry, scanning and transmission electron microscopies. The mullite powder compacts containing 2-10wt% Y2O3 w…