Materials Literature
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The static solitons of the square-rectangular martensitic transformation are obtained with the use of higher-order elasticity theory; both first-order (rectangular-rectangular and square-rectangular solitons) and second-order (rectangular-rectangular only) phase transitions are treated. The shear and dilatational stra…
The relative intensities of the lcr1, Lgy L/z, LB3, and .L71 lines were measured using ten R.EE phosphates. These data were used to calculate peak-overlap corrections for the Lal and Lp1 lines of RE'8. Wavelength-dispersion and energy-dispersion specfia of the Z lines of fourteen R.EE compare favorably with the spectr…
Abstract The thermally stimulated‐current method (TSC) has been employed to determine the temperatures and intensities of T β , T g , and T > T g for pure isotactic, pure syndiotactic, and five atactic specimens with syndiotactic triad content from 49.5 to 75%; T g was found to increase linearly with syndiotactic t…
X-ray photoemission spectroscopy has been used to investigate the chemical bonding and reactivity of the Al–polyimide interface. At 300 °C substrate temperature, initial deposition of Al reacts with polyimide up to about 3.5 ml. The reaction occurs mainly with the carbonyl group, resulting in the formation of an inter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganophosphazenes. 18. Friedel-Crafts phenylation reactions of alkyl- and (dimethylamino)fluorocyclotriphosphazenesChristopher W. Allen, Scott Bedell, William T. Pennington, and A. Wallace CordesCite this: Inorg. Chem. 1985, 24, 11, 1653–1656Publication Date (Print):May 1,…
The contribution of the occluded polystyrene in the crosslinked rubber gel to the overall swelling has been determined theoretically and experimentally. Theoretical calculation consists of modification of the Flory–Rehner equation. The equation describes the swelling of a crosslinked polymer network in the presence of…
Thermal conductivities (k,keff) have been estimated for sintered and sphere-pac Li2O and γ-LiAlO2 with and without neutron irradiation effects. The estimation is based on (a) data from unirradiated UO2, Li2O, and γ-LiAlO2; (b) data from irradiated dielectric insulator materials; and (c) relatively simple physical mode…
The deconvolution of spectral information from sparse x-ray data is a widely encountered problem in data analysis. An often-neglected aspect of this problem is the propagation of random error in the deconvolution process. We have developed a Monte-Carlo approach that enables us to attach error bars to unfolded x-ray s…
Abstract A simple, lumped‐parameter model has been developed to predict the length and shape of a parison on the basis of experimental swell data and the storage modulus of the resin. The applicability and limitations of the model are demonstrated by comparing its predictions with experimental observations of parison…
Abstract On the basis of a spontaneous conversion reaction of molybdophosphate (formed in an aqueous medium including acetonitrile, acetone, or dioxane), the existence of β-modification of dodecamolybdophosphate has been substantiated. The conversion reaction was highly affected by the presence of the organic solvents…
Abstract Most Colorado soils contain adequate levels of plant‐available K. This study investigated the influence of up to 750 kg K ha −1 on four semidormant varieties of alfalfa ( Medicago sativa L.) grown on a soil high in K (Nunn clay loam—Aridic Argiustoll) over 4 years. Fertilizer K significantly increased dry mat…
The properties of ‘‘diamondlike’’ carbon films grown by glow discharge 30 kHz plasma using methane are reported. The C ls XPS line shape of films showed localized hybrid carbon bonds ranging from as low as 40% to as high as 97% percent of the total carbon bonds. Infrared spectroscopy and N15 nuclear reaction profiling…
The effect of a square well potential added to the hard core repulsion, between particles in a dilute suspension, on their self-diffusion coefficient is investigated on the basis of the results, obtained by Batchelor, for the mobility of these particles. Hydrodynamic interactions are neglected. It is found that a mode…
The series LixNbS2 (0 ≤ x ≤ 0.50) and LixNbSe2 (0 ≤ x ≤ 0.67) have been prepared by high-temperature reaction of Li2S, Nb, and S or Li2Se, Nb, and Se. Structures have been determined by analysis of X-ray powder patterns with polytypism observed in the sulfide series. Evidence of staging and Li ordering is reported, an…
Abstract Die neuen Verbindungen Ba 2 SiSe 4 und Ba 2 SiTe 4 kristallisieren monoklin (Raumgruppe: P2 1 /m, Nr. 11) in der Sr 2 GeS 4 ‐Struktur mit den Gitterkonstanten Ba 2 SiSe 4 : a = 918,4(5) pm, b = 703,3(3) pm, c = 687,2(3) pm, β = 109,2(1)° Ba 2 SiTe 4 : a = 965,0(5) pm, b = 762,6(3) pm, c = 746,6(3) pm, β = 108…
Calorimetric measurements were carried out to investigate the solid state polymorphism of MBBA. Conditions for the production of a glassy liquid crystal phase were studied. The DSC experiments proved the existence of two independent modes of phase transition: (i) a sequence of irreversible transitions based on a molec…
Abstract Ferulic acid (= 4‐hydroxy‐3‐methoxycinnamic acid) was condensation polymerized at temperatures between 0 and 50°C in bulk or various solvents, using thionyl chloride as activator in the presence or absence of bases. Depending on reaction conditions, true relative yields up to 100% and reduced viscosities (at…
The crevice corrosion susceptibility of cold-worked Type 316LVM stainless steel, cast Co-Cr-Mo, wrought Co-Cr-W-Ni, non-nitrided and nitrided Ti-6Al-4V ELI, and c.p. Ti, Grades 1 and 4, was studied in vitro by means of a crevice cell. Occlusion was created by interfacing a disc specimen and a Teflon bar. Specimens wer…
For elastomers to be used in vacuum applications, their permeability should be low. Elastomers that are now, or likely to be, used in vacuum have been studied. The permeability of copolymers of fluoroelastomers and PTFE propylene (AFLAS) and a homopolymer of epichlorohydrin have been measured for hydrogen, helium, arg…
Segmentation of large areas of light microscopic slides into N by N fields, and each of these fields into M digital image tiles, allows the scanning, storage and digital processing of large images. Any of the original N2 fields or composites of M adjacent tiles can be recalled to the video display for analysis. Develo…