Materials Literature
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An instrument capable of detecting and locating partial discharge sites and faults in shielded power cables was developed on behalf of a group of US electric utilities. The instrument uses state-of-the-art electronic hardware and advanced digital signal processing techniques. The partial discharge signals are reconstr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic studies on macrocyclic dicopper(II) complexes. Influence of electron-withdrawing axial ligands on spin exchangeSanat K. Mandal, Laurence K. Thompson, Michael J. Newlands, Eric J. Gabe, and Kamalaksha NagCite this: Inorg. Chem. 1990, 29, 7, 1324–1327Pu…
This paper presents some of the major results which have contributed to the present understanding of the behaviour of the α-β transition of quartz, one century after its discovery by Le Chatelier in 1889. Most properties of the low temperature α phase can be explained in the frame of the Landau theory of first-order t…
Infrared spectroscopic studies of lead and alkaline‐earth aluminosilicate glasses in the series x MO‐ x Al 2 O 3 (1 ‐ 2 x )SiO 2 M = Mg, Ca, Sr, Ba, and Pb; 0.05 x 0.275] were carried out in the range 2000 to 200 cm −1 . Three major absorption bands were observed in the 1100‐, 800‐, and 500‐cm −1 regions. The frequenc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyaninato polysiloxanes substituted with crown ether moietiesO. E. Sielcken, L. A. Van de Kuil, W. Drenth, J. Schoonman, and R. J. M. NolteCite this: J. Am. Chem. Soc. 1990, 112, 8, 3086–3093Publication Date (Print):April 1, 1990Publication History Published online1 M…
Future space power needs are extrapolated to be at least three to four orders of magnitude more than is currently available. This long-term reliable power will be required on missions such as the Space Station, Pathfinder, Space Plane, and high-powered satellites, and for national defense. Electrical insulation and di…
Phase transitions in ferroelastic and other crystals with large elastic anomalies (i.e. co-elastic crystals) follow Landau-type behaviour over extended temperature intervals. No or only weak anomalies occur near the transition point and Landau-type behaviour occurs down to the saturation temperature below which the or…
The observation of a new critical point in liquid-crystal phase transitions is reported. Detailed tilt-angle, polarization, and susceptibility measurements of a ferroelectric liquid-crystal compound in the presence of an applied dc electric field show that a first-order phase transition between the polarized smectic-A…
Abstract A theory based on classical nucleation theory is developed for bubble nucleation in polymer solutions. The theory requires information on solubility, diffusivity, concentration, surface tension, temperature, and degree of supersaturation. The effects of supersaturation and of the presence of large molecules i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSurface modification of PMDA-oxydianiline polyimide. Surface structure-adhesion relationshipKang Wook Lee, Steven P. Kowalczyk, and Jane M. ShawCite this: Macromolecules 1990, 23, 7, 2097–2100Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid salts and the structure of ionomersMichael M. Coleman, Joon Y. Lee, and Paul C. PainterCite this: Macromolecules 1990, 23, 8, 2339–2345Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April 1990https://pubs.acs.org/…
The dynamic organization of dislocations into spatially heterogeneous substructures is demonstrated by applying the principles of dislocation dynamics that were outlined in the preceding paper. Here it is shown that the formation of persistent slip bands is a consequence of the competition between dipole formation and…
We generalize the Chen-Lubensky model for the point where the nematic, smectic-A, and smectic-C liquid-crystalline phases meet (the NAC point) to include the effects of molecular chirality. We calculate the phase diagram for this model when the possibility of a twist-grain-boundary (TGB) phase is included and when it…
Abstract The reduction and reoxidation of three nontronite samples, GAN (API H-33a, Garfield, Washington), SWa-1 (ferruginous Washington smectite), and NG-1 (Hohen Hagen, Federal Republic of Germany) were studied with visible absorption and Mössbauer spectroscopy. The intensity of the intervalence electron transfer (I…
Microcomposite membranes were produced via the in situ diffusion-controlled, acidcatalyzed sol-gel reaction for tetraethoxysilane in prehydrated and methanol-swollen Nafion perfluorosulfonic acid films. The thermal behavior of these microcomposites was investigated using thermogravimetric analysis (TGA) and differenti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelative electron donor strengths of tetrathiafulvene derivatives: effects of chemical substitutions and the molecular environment from a combined photoelectron and electrochemical studyDennis L. Lichtenberger, Roy L. Johnston, Klaus Hinkelmann, Toshiyasu Suzuki, and Fred Wu…
Other| April 01, 1990 The genus Ammonia Bruennich, 1772; its geographic distribution and morphologic variability William R. Walton; William R. Walton Northwestern University, Department of Geological Sciences, Evanston, IL, United States Search for other works by this author on: GSW Google Scholar Benjamin J. Sloan Be…
The influence of small amounts of copper on the neutron-irradiation-induced embrittlement of reactor pressure vessel steels is of considerable current interest. Previous work has shown that the embrittlement is associated with the formation of copper-rich precipitates, but uncertainties remain regarding their composit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGadolinium complexation by a new diethylenetriaminepentaacetic acid-amide ligand. Amide oxygen coordinationMark S. Konings, William C. Dow, David B. Love, Kenneth N. Raymond, Steven C. Quay, and Scott M. RocklageCite this: Inorg. Chem. 1990, 29, 8, 1488–1491Publication Date…
ABSTRACT: It is demonstrated that densely cross-linked polymer networks with a helicoidal order in the nematogenic bridging units can be created by photoinitiated polymerization of liquid-crystalline diacry-lates containing a chiral dopant. The natural pitch of the monomeric mixture is controlled by the dopant concent…