Materials Literature
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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…
An analytical treatment for the sedimentation rate of disordered suspensions is presented in the context of a resistance problem. From the calculation it is confirmed that the lubrication effect is important in contrast to the suggestion by Brady and Durlofsky [J. F. Brady and L. J. Durlofsky, Phys. Fluids 31, 717 (19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinated Aluminum in Noncalcined Amorphous Aluminosilicates, Prepared in Alkaline and Acid MediumsB. M. De Witte, P. J. Grobet, and J. B. UytterhoevenCite this: J. Phys. Chem. 1995, 99, 18, 6961–6965Publication Date (Print):May 1, 1995Publication History Published on…
In order to describe the evolution of rolling textures in bcc metals, and particularly to assess the contribution of dislocation slip on {123} glide planes, a Taylor model, which makes use of increasing strain relaxation and considers various types of bcc glide system, is applied. The deformation is simulated in the r…
Two new ferroelectric oligosiloxanes, a cyclic tetramer and a twin, have been synthesized. By a comparative study with their corresponding monomer and side chain polysiloxanes, the influence of oligo- and polymerization on the liquid crystalline and ferroelectric properties have been investigated. Polymerization leads…
Crystal structures of mitochondrial aconitase with alpha-methylisocitrate and with sulfate bound have been solved and refined at 2.0 A resolution with R factors of 18.2 and 16.8%, respectively. The steric factors and conformational effects observed in both new structures support the proposed mechanism for the overall…
Abstract Recently, a model was developed for the nonisothermal crystallization of normal alkanes with chain lengths between 30 and 50. The model was derived based on the fundamental equation of Ozawa for nonisothermal crystallization, the surface nucleation theory, and the growth rate theory for extended chain crystal…
Lanthanide chelate labels containing substituted 4-(arylethynyl)pyridine as the chromogenic moiety and iminobis(acetic acid) groups as the chelating part were synthesized. N-Succinimidyl esters of the carboxy derivatives of thyroxine and progesterone were prepared and coupled to the aliphatic amino groups of the synth…
Abstract A novel manganese(III) complex having an optically active N,N′-bis(3-oxobutylidene)diamine ligand with bulky substituents was prepared and characterized crystallographically. In the presence of a catalytic amount of the manganese(III) complex, unfunctionalized olefins were oxygenated to give optically active…