Materials Literature
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Characterizing the properties of F − ‐doped MgO indicated new roles for fluorine ions in accelerating densification: (1) increased strains in MgO before rapid densification and (2) the thermal generation of enormous oxygen ion vacancies. Immediately after rapid shrinkage, fluorine‐containing species vaporized from the…
The copper distribution in sputtered aluminum–copper films depends on copper concentration and deposition temperature. At high deposition rates the film temperature is high enough for diffusion to occur without external substrate heating. Targets containing 0.5%, 2%, and 4% copper were used to deposit films by dc magn…
Classical results in the behavior of woven fabrics are extended to the case of fabrics having three planar, nonorthogonal axes of symmetry (triaxial). The biaxial loading analysis due to Grosberg is extended to the loading of triaxial fabrics in the machine and cross-machine directions in an attempt to predict fabric…
A patient exhibited confusion, dysphasia, and striking asterixis 18 hours after metrizamide myelography. The symptoms lasted for a day and a half. While metrizamide is a useful contrast medium, side effects are not unusual and can, on occasion, be quite severe.
Various schemes of using adiabatic demagnetization to provide refrigeration in the 10-1000 mK range are discussed with particular reference to the requirements for use in space. The methods considered are complete demagnetization, isothermal demagnetization, moving magnet demagnetization, and continuous refrigeration.…
Electrostatic-field optimization of the profile of the gas-dielectric interface was studied as a means of improving the dielectric performance of epoxy spacers. An optimum disc-shaped spacer was defined with a dielectric cone angle of 750, assuming a dielectric constant of the epoxy resin of 5 or higher. The dielectri…
The influence of an external field and of a space-charge polarization field on phase transitions in ceramic and monocrystalline PbZrO3 samples has been investigated. Attempts at defining the influence of purposely-formed structure defects on the presence and temperature range of the occurrence of the ferroelectric pha…
Abstract Die nicht äquivalenten S 2 2− ‐Liganden des [(S 2 ) 2 Mo v (S 2 ) 2 Mo v (S 2 ) 2 ] 2− ‐Komplexes zeigen gegenüber nucleophilen Reagentien deutliche Unterschiede in der Reaktivität. Endprodukt der Reaktion z. B. mit OH − in wäßrigem Medium ist [Mo 2 O 2 S 2 (S 2 ) 2 ] 2− , das als Tetramethylammoniumsalz in h…
Abstract The density ρ of N‐(p‐n‐butoxybenzylidene) p‐n‐butylaniline (BBBA) has been measured as a function of temperature from S H to isotropic liquid phase. The compound exhibits three smectic and two nematic phases. The phases assigned are S H ↔ S B ↔ S A ↔ N C ↔ N O ↔ I. The change of ρ across the transition S H ‐…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrosynthesis of the metal phthalocyanine complexesC. H. Yang, S. F. Lin, H. L. Chen, and C. T. ChangCite this: Inorg. Chem. 1980, 19, 11, 3541–3543Publication Date (Print):November 1, 1980Publication History Published online1 May 2002Published inissue 1 November 1980http…
The filtration performance of nonwoven thick synthetic fabrics used in soil stabilization, erosion control, and earth reinforcement is predicted from a proposed analytical method. The morphological analysis of many fabrics has been utilized to identify internal structure parameters responsible for their hydraulic prop…
Minimum temperatures for the initiation of smolder in cellulosic insulation materials were measured by the method of Bowes and Townshend (1-D heat flow through a layer on a hot surface). The minimum temperature decreases rather rapidly with layer thickness; a range of about 320°C to 220°C is indicated for layers from…
Some problems of the paracrystal model of diffraction from distorted lattices are discussed. The relationship between paracrystals and crystal growth-disorder models is established and the latter are used to generate examples of distorted lattices having many of the properties envisaged for paracrystals without some o…
Abstract A technical advance in the size reduction of cured scrap rubber has been achieved by a new process. The performance of products whose particle dimensions are 90% under 20 µm in diameter has been described in this study. When small panicle size rubber made by this process is used to extend high quality compoun…
Abstract The treatment of (TBA)TcO 4 with conc. HCl or HBr at room temperature yields (TBA)[TcOCl 4 ] or (TBA)[TcOBr 4 ], which are nearly insoluble in acidic aqueous solutions, but well soluble in organic solvents. The vibrational spectra indicate C 4v symmetry for the complex ions. (TBA)[TcOBr 4 ] shows an unusual r…
Abstract TiP 2 S 6 kristallisiert orthorhombisch in der Raumgruppe Fdd2 mit a = 10,842(4), b = 7,440(5), c = 21,535(6) Å und Z = 8. Ans 548 beobachteten symmetrieunabhängigen Reflexintensitäten, die auf einem automatischen Zweikreis‐Einkristalldiffraktometer gemessen wurden, konnte die Kristallstruktur mit Hilfe einer…
Collagen fibrils from the mesenteric connective sheath of the adult cockroach Periplaneta americana were extracted by enzymatic digestion with pepsin and were purified. Chromatographic studies and sodium dodecylsulfate electrophoresis revealed the presence of a single chain. It was demonstrated that the structure of t…
Abstract Durch Kondensation einer aus Disilicatanionen aufgebauten schlecht geordneten Calciumhydrogensilicatphase [1] unter der Mutterlauge bei 80°C und durch Hydrothermalreaktion vor Ca(OH) 2 mit SiO 2 · aq bei 150°C entsteht eine Calciumhydrogensilicatphase, die zu etwa gleichen Teilen (bezogen auf Si) aus Poly‐ un…
Phase relations in the system Y 2 O 3 ‐Y 2 O 3 ·WO 3 were studied at >1400°C. Yttrium oxide with the rare‐earth C‐type structure transformed into a hexagonal structure at 2360° and melted at 2400°C. The eutectic between Y 2 O 3 and 3Y 2 O 3 ·WO 3 was 2334°C at ∼90 mol% Y 2 O. 3Y 2 O 3 ·WO 3 with a rhombohedral stru…
Abstract The incorporation of sulfate into anodic film formed on aluminium in an H2SO4–MgSO4 solution was investigated by infrared spectroanalysis using the compensation method. The sulfate content of the film was very small at the initial stage of anodizing, but increased with time to a nearly constant value. This re…