Materials Literature
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The phase behavior of the three-component PEO-PPO-PEO/dextradwater system has been studied. Pluronic L64, P105, and F68 were used, and they are members of a family of triblock copolymers with the structure PEO-PPO-PEO, where PEO is poly(ethy1ene oxide) and PPO poly- (propylene oxide). Moreover, these triblock copolyme…
The spatial distribution of backscattered electrons is studied for an Au target with a new Monte Carlo simulation including the discrete energy loss process. The new model is based on the Mott cross section for elastic scattering and the Vriens cross section for inelastic scattering. Some results are compared with the…
The paper describes investigations of the UHF performance of a disc coupler designed for continuous monitoring of partial discharge in gas-insulated substations and indicates how the UHF sensitivity can be improved. Resonant frequencies of the disc are calculated, and the coupler is shown to be most sensitive at these…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical Nonlinearities in AzoarenesI. D. L. Albert, J. O. Morley, and D. PughCite this: J. Phys. Chem. 1995, 99, 20, 8024–8032Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://pubs.acs.org/doi/10.1021/j10002…
Abstract The application of in situ Fourier transform infrared spectroscopy for the study of electrochemical redox reactions of conducting polymers is described. The experimental setup of two different methods, external reflection absorption spectroscopy and attenuated total reflection spectroscopy, is shown. The resu…
In this work we analyse the consequences of relaxing the rotational isomeric state (RIS) approximation in predicting the transitional properties of nematogenic systems formed by two mesogenic moieties linked by a flexible spacer, as in the homologous series of α,ω-bis(4′-cyanobiphenyl-4-yl)alkanes and α,ω-bis(4′-cyano…
Carbon nanotubes (see figure) constitute one of the smallest one‐dimensional and nearly perfect structures available and these materials should exhibit a wide range of interesting properties. Most of these properties, however, will only be of use if te structures can be manipulated into a controlled configuration here…
The interfacial structure of [1011] twins obtained using atomic-scale computer simulation by Serra, Pond and Bacon in 1991 is shown to be qualitatively consistent with high-resolution transmission electron micrographs of such twins in Ti obtained by Kasukabe, Yamada, Peng and Bursil in 1993. In addition, images of two…
The structural properties of copper(I) iodide have been investigated at pressures up to 40 GPa using the angle-dispersive x-ray diffraction technique with an image-plate area detector. A previously unreported structural phase transition is observed in the region of 17.3 to 18.2 GPa, from the antilitharge structured ph…
Scale Inhibitor Adsorption/Desorption vs. Precipitation: The Potential for Extending Squeeze Life While Minimising Formation Damage M.M. Jordan; M.M. Jordan Heriot-Watt University Search for other works by this author on: This Site Google Scholar K.S. Sorbie; K.S. Sorbie Heriot-Watt University Search for other works b…
The behavior of liquid crystalline polymers in the interfacial region between the isotropic and nematic phases is investigated based on an inhomogeneous free-energy functional. A mean-field approximation is used for the system of semiflexible polymers obeying the Saito-Takahashi-Yunoki description and interacting via…
Those who need a better vacuum, either in existing systems or for new construction, should be interested in this discussion, since there is at present no method of analysis to predict the bake time and temperature required to achieve a specific low outgassing rate from stainless steel. It has been known for a generati…
O2 and pH microprofiles were measured above corroding mild steel covered with a biofilm. The pH in the anodic areas (tubercles) ranged from 5 to 7 and was always 9.45 at the surface of the cathodic areas. After 1 month of biofilm development, O2 was depleted at the anodic area but could reach the cathodic surface wher…
Abstract A new polymide was synthesized from 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BTDA) and 2,2‐dimethyl‐1,3‐(4‐aminophenoxy)propane (DMDA), and abbreviated to be BTDA‐DMDA. This polymer possesses three relaxation processes which have been observed through dynamic mechanical and dielectric analyses above…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle Sheet of a Quasi-Planar Macromolecule Prepared by Photopolymerization at a Solid SurfaceHiroyuki Ozaki, Tsutomu Funaki, Yasuhiro Mazaki, Shigeru Masuda, and Yoshiya HaradaCite this: J. Am. Chem. Soc. 1995, 117, 20, 5596–5597Publication Date (Print):May 1, 1995Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacrocyclic Mononuclear VIV and VV, Heterodinuclear VIVNiII, and Heterotrinuclear VIVNiIIVV Complexes: Synthesis, Structure, Electrochemistry, and MagnetochemistryKausik K. Nanda, Sasankasekhar Mohanta, Soma Ghosh, Monika Mukherjee, Madeleine Helliwell, and Kamalaksha NagCit…
During the spring diatom blooms of 1992 and 1993 in Loch Creran, Scotland, regular water column and sediment samples were collected, examined, and species composition of the phytoplankton determined. Thalassiosira species were found to be a major bloom constituent. Species were identified from specimens cultured from…
Porous carbon–carbon preforms, 10.8 cm o.d.×4.4 cm i.d.×3.0 cm thick have been densified in a one-cycle, 26 h process. The disks are heated by induction, creating an inside-out thermal gradient, and are exposed to cyclopentane vapor in a water-cooled vacuum chamber. Rough-laminar carbon microstructure is obtained; a c…
This paper presents a new method for determination of instantaneous magnetization characteristics of transformers (saturation and hysteresis loop) by taking into account only the RMS values and no-load losses. This model is used to accurately study ferroresonance phenomena in a system of a cable-connected transformer.…
Modifications of the phase-separated surface of polystyrene–polyethyleneoxide (PS-PEO) blend films were carried out by using an atomic force microscope. On PEO, contrary to PS, a scanning of a tip with large forces of 50 nN resulted in a modification of surface and increased the elastic stiffness. The modification was…