Materials Literature
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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…
Polarization-related electrostrictive coefficients Qh have been determined for relaxation dielectrics 0.856Sr TiO3-0.144 Bi2/3 TiO3 and (K3/4Bi1/4) (Zn1/6Nb5/6)O3, and for a simple non-polar perovskite BaZrO3 by measuring the hydrostatic pressure dependence of the dielectric permittivity. Anomalous variation in the el…
Age-hardening mechanisms of dental Ag-Pd-Cu-Au alloys were investigated by means of electron microscopic observations. Hardening was due to the precipitation of the L10 type CuPd-ordered platelet in the grain interior and to the discontinuous precipitation at the grain boundary. The characteristics of age-hardening cu…
Abstract Information on the dissolution of phosphate rock in soils as related to soil properties is needed in order to understand the solubility behavior of the phosphate rock in soils as related to crop response. This study was conducted to determine the relationships between the dissolution rate of North Carolina ph…
Abstract A detailed mathematical model of a single catalyst pellet has been developed to describe its behavior under transient conditions encountered during the warmup period of automobile exhaust catalytic converters. In contrast to the converter models previously reported in the literature, this model is capable of…