Materials Literature
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This paper describes the time evolution of bubbles generated by underwater electrical discharges. The oscillations of these high-temperature vapor and plasma bubbles generate acoustic signatures similar to the signatures generated by air guns, underwater explosions, and combustible sources. A set of model equations is…
The structure and composition of passive films electrochemically formed on Ni‐Cr alloys in 1 M NaOH and 0.5 M has been studied with x‐ray photoelectron spectroscopy. The passivation potential was varied within the passive range up to the transpassive range and the time of passivation from 10 ms to 1000 s. With angular…
Pitting corrosion of stainless steel has been extensively studied by electrochemical impedance spectroscopy (EIS). However, the frequency dependence of the current distribution is much different in the vicinity of a pit than on the passivated part of the surface. Therefore a localized electrochemical impedance techniq…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Characterization of Photo-Cross-Linked Polymers Based on Poly(l-lactic acid-co-l-aspartic acid)Jennifer Elisseeff, Kristi Anseth, Robert Langer, and Jeffrey S. HrkachView Author Information Harvard−MIT Division of Health Sciences and Technology, Cambridge, Massach…
A topology-based and duality-derived three-phase, three-winding, core-type transformer model is presented. The model treats the leakage inductances and the coupling effects of the core in a straightforward and integrated way. The long-established positive- and zero-sequence star equivalent circuits of a three-phase th…
Mathematical models were developed to predict cathodic protection (CP) requirements for coated pipelines protected by parallel anodes. This work was motivated by the need to estimate current and potential distribution on a pipe when anodes are placed nearby or when discrete coating holidays expose bare steel. The math…
Crystallization and growth of an isolated extended chain single crystal (ECSC) of polyethylene (PE) under high pressure from the melt into the mobile phase, such as hexagonal phase, was studied by in-situ optical microscopy and transmission electron microscopy. Direct evidence is obtained that an isolated ECSC was for…
Other| April 01, 1997 Phase relations among smectite, R1 illite-smectite, and illite Hailiang Dong; Hailiang Dong University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States Search for other works by this author on: GSW Google Scholar Donald R. Peacor; Donald R. Peacor Search for other work…
In the present study a comprehensive mathematical model is developed to simulate the dynamic behavior of industrial poly(vinyl chloride) (PVC) batch suspension polymerization reactors. More specifically, the model predicts the monomer concentration in the gas, aqueous, and polymer phases, the overall monomer conversio…
Topographic and frictional changes on the surface of a highly oriented pyrolytic graphite electrode in 1 M LiClO 4 ethylene carbonate/ethylmethyl carbonate (1:1) electrolyte were examined during charge and discharge by in situ electrochemical atomic force microscopy and friction force microscopy simultaneously in real…
Photocatalytic degradation of gaseous propionaldehyde over TiO 2 -loaded adsorbent films was investigated after adsorption equilibrium was obtained using silica, alumina, activated carbon, and several kinds of zeolites as adsorbents. Irradiation of one-tenth of the TiO 2 -loaded adsorbent film caused complete minerali…
Low-frequency dielectric properties were measured for study of the transport properties of impurity ions in nematic liquid crystal (NLC: 4-cyano-4'-pentyl biphenyl) cells with and without polyimide alignment layers. It was found that the dielectric behavior of the NLC cells without polyimide alignment layers is due to…
A model composed of the nonlinear Cahn−Hilliard and Flory−Huggins theories for spinodal decomposition (SD) and a second-order rate equation for polymerization for the self-condensation of a trifunctional monomer is used to study the polymerization-induced phase separation (PIPS) phenomena. The numerical results are co…
Hyperbranched aromatic polycarbonates were prepared by the polymerization of an A 2 B monomer derived from 1,1,1-tris(4‘-hydroxyphenyl)ethane. Protection of one of the three phenols of the triphenol by a tert -butyldimethylsilyl group was followed by conversion of the remaining two phenolic groups to carbonylimidazoli…
A photothermal microscope that provides micrometer lateral and submicrometer depth resolution was designed. Thermal conductivity measurements with modulation frequencies up to 12 MHz on single grains in polycrystalline diamond demonstrate its lateral resolution power even for a highly conducting material. Measured con…
The electro-optical behavior of polymer stabilized cholesteric texture cells has been investigated for three different polymers. The switching process was studied with respect to the electric field dependence of the diffuse reflectivity, diffuse transmittance, and the dynamics of the reorientation process. For certain…
Abstract A new model for the interpretation of dioctahedral mica infrared (IR) spectra in the OH stretching vibration region is proposed. It is based on the analysis of the main factors responsible for the observed sequence of the OH frequencies. In terms of this model, the simple analytical dependence between the OH…
Dynamic mechanical spectroscopy (DMS) is used to further investigate the recently observed order−disorder transition (ODT) in comblike block copolymers obtained by hydrogen bonding between poly(4-vinylpyridine) and pentadecylphenol (P4VP−PDP x ). For stoichiometric amounts of pyridine and phenol, i.e., x = 1.0, the OD…
Mechanical behavior of the Space Shuttle redesigned solid rocket motor (RSRM) propellant is studied from a phenomenological point of view. Motivated by the study of the experimental data three initially isotropic constitutive models have been developed. All models represent the effect of strain rate, superimposed hydr…
We present a review of some results concerning electronic transport properties of quasicrystals. After a short introduction to the basic concepts of quasiperiodicity, we consider the experimental transport properties of electrical conductivity with particular focus on the effect of temperature, magnetic field, and def…