Materials Literature
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Exchangeable Al in subsoils of Ultisols in the southeastern USA can restrict rooting depth. Downward movement of basic cations (Ca, Mg, and K), applied as lime and fertilizer, may diminish that restriction over time. Materials from the argillic horizon were collected from three paired sites, having managed (long-term…
Abstract Imidization of polyamic acid prepared from pyromellitic dianhydride and 4,4′‐methylenedianiline was investigated at 373–493 K. At a certain degree of imidization, depending on the reaction temperature, the reaction is significantly slowed down. For this reason, imidization was divided into two phases, a fast…
A mathematical model for forced‐flow chemical vapor infiltration (CVI) for densification of porous ceramic composites is presented. The process consists of mass transport of reactants by both convection and diffusion into a porous preform, decomposition of reactants, and subsequent deposition of solid product on pore…
The ferromagnetic Heusler alloy Pd2MnSn shows large reduction in magnetization by cold working, without any appreciable change in the Curie temperature. In order to clarify the relationship between the reduction and the defect structure in Pd2MnSn, transmission electron microscopic observation, high-resolution neutron…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of electrically conducting indium-tin-oxide thin films by heat treatment of mixed-metal hydroxide dispersion containing polymer binderTakaki Kanbara, Masayuki Nagasaka, and Takakazu YamamotoCite this: Chem. Mater. 1990, 2, 6, 643–645Publication Date (Print):Novem…
The bifunctional enzyme involved in tyrosine biosynthesis, chorismate mutase-prephenate dehydrogenase, has been isolated from extracts of a plasmid-containing strain of Escherichia coli K12 and purified to homogeneity by a modified procedure that involves chromatography on both Matrex Blue A and Sepharose-AMP. Detaile…
Article Elastic and thermoelastic properties of isotypic KClO4, RbClO4, CsClO4, TlClO4, NH4ClO4, TlBF4, NH4BF4 and BaSO4 was published on November 1, 1990 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 192, issue 1-4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConcentrated emulsions. Investigation of polydispersity and droplet distortion and their effect on volume fraction and interfacial areaAshok K. Das and Pushpito K. GhoshCite this: Langmuir 1990, 6, 11, 1668–1675Publication Date (Print):November 1, 1990Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure and conformation of polymers from cluster molecular orbital and molecular mechanics calculations: polyimideSherif A. Kafafi, John P. LaFemina, and Jeffrey L. NaussCite this: J. Am. Chem. Soc. 1990, 112, 24, 8742–8746Publication Date (Print):November 1, 1…
UNLABELLED: A varied-space grating mounted to both rotate and translate constitutes a practical single element fixed slit monochromator which is in focus at all wavelengths. KEYWORDS: Monochromators, diffraction gratings, grazing incidence, x-ray optics.
Abstract The belt-skim rubber of a passenger-car tire has changes in its tensile properties, M 100 and λ b , during service in the field. The changes are larger in higher temperature fields with an equivalent duration. It can be interpreted that the changes are caused simply by oxidative crosslinking similar to that w…
Abstract In the course of work on linear and ring polybutadienes with 62% 1,2 units, a number of discrepancies were noted with data on polybutadienes of various microstructure available in the literature. For example, G N ο =870 kPa for our 62% 1,2-polybutadiene. This is larger than G N ο =730 kPa for a 56% 1,2-polybu…
The optical properties of VO 2 and V 2 O 5 were determined using spectroscopic ellipsometry. The unique physical properties of these materials will be presented and discussed in conjunction with the materials electronic band structure determined by calculations using the orthogonalized linear combination of atomic orb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe thermoreversible gelation of syndiotactic polystyreneA. Prasad and L. MandelkernCite this: Macromolecules 1990, 23, 23, 5041–5043Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs.acs.org/d…
Abstract Haplohumults and Argixerolls have formed in close proximity on phyllite colluvium and serpentinite residuum, respectively, in the Klamath Mountains of northwestern California. This study was conducted to compare their contrasting properties and to investigate soil mineral weathering. Thick, dark A horizons co…
As shown in an earlier publication (Håkansson 1990) C. kuetzingiana Thwaites and C. meneghiniana Kütz. are conspecific and for this the name C. meneghiniana has to be used. A new name, C. krammeri, is now proposed for the taxon that has long been called C. kuetzingiana and the similarity of this species to C. ocellata…
Abstract A series of carbon blacks of widely varying morphology and microstructure were analyzed for surface compositional properties employing SIMS, XPS/ESCA, and GC-MS. These studies were supported by bulk analyses for hydrogen and oxygen content. Surface reactivity was assessed by means of inverse gas chromatograph…
The switching of polarization in ferroelectrics is considered as the first-order phase transition. By the analogy with the theory of crystal growth it is assumed that the switching process is determined by the oversaturation degree which correspond in ferroelectrics to the magnitude of electric field on the domain bou…
Ilex crenata Thunb. `Rotundifolia' split-root plants were grown for 3 weeks with root zones at 30/30, 30/34, 30/38, 30/42, 34/34, 38/38, and 42/42C. The 38C root-zone treatment was the upper threshold for several growth and physiological characteristics. A portion of the root system grown at or near the optimum temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTotal synthesis of (+)-verrucosidinKonghyun Whang, R. J. Cooke, Gurol Okay, and Jin K. ChaCite this: J. Am. Chem. Soc. 1990, 112, 24, 8985–8987Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs…