Materials Literature
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Abstract The effect of N,N‐dialkyl dithiocarbamate substitution on the radiation stability of poly(vinyl chloride) (PVC) film was studied. PVC containing 6.5–15.7 mole‐% N,N‐dimethyl dithiocarbamate (PDM) and PVC containing 8.3–17.5 mole‐% N,N‐diethyl dithiocarbamate (PDE) was irradiated with γ‐rays from a Co‐60 sourc…
Over the last half century various techniques and devices have bean developed to give a visual display of infrared signals and images. In the present article a relatively recent development is described in which conversion from infrared to visible is accomplished in a single luminescent material. Most luminescent soli…
Two experiments involving dosing sheep with 60Co were conducted to determine the effect of plant species on cobalt retention. Two digestibility trials with different levels of dietary cobalt were conducted to attempt to detect the effect of cobalt level upon nutrient digestibility. Experiment 1 was a 2 × 2 factorial d…
The effect of internal strain in the zincblende structure was examined on a GaAs single crystal by X-ray intensity measurements under a uniaxial stress along the [1{\bar 1}0] direction. It was found that the stress changes the structure factor of the weak reflexion (006), giving the value ζ = 0.764 ± 0.009 for the bon…
Abstract A theory of V k centres in simple cubic Cs‐halides in the spirit of Sewell's treatment of the small polaron is presented. The stability of a hole trapped on a single site and that of the V k centre are compared. Expressions for the peak position and width at half maximum of the uv ( 2 Σ → 2 Σ ) absorption ban…
The morphology and physical performance properties of the cotton fiber are reviewed. The objective is to clarify interrelationships between cotton morphology and textile performance properties and to delineate approaches to improve chemically modified cotton fabrics. The review has been restricted primarily to subject…
Abstract Solutions of polystyrene in p ‐xylene were frozen in liquid nitrogen. No changes in molecular weight and distribution were caused by freezing solutions for a series of narrow distribution polystyrenes with molecular weights of near 2 × 10 6 and lower. Likewise a commercial polystyrene of M̄ w = 234,000 showed…
Fluxless vacuum brazing has become a commercially feasible process for the high-volume, low-cost production of aluminum heat exchangers. With an Al–Si–Mg filler metal, excellent joint quality is obtained without requiring the use of a flux. A limited understanding of the wetting and flow characteristics of the filler…
Everhart’s theory on the backscatter of electrons from solids is extended so as to yield the backscatter coefficient as a function of the retarding potential rejecting backscattered electrons having energies below a certain fraction of the energy of the primaries. From this function an analytical expression is obtaine…
Abstract This paper has attempted to review current knowledge on mixing fundamentals from a carbon black standpoint. The mixing parameters discussed include volume fill factor, specific energy of mixing, temperature buildup, and flow characteristics. Together, these parameters define the economics of mixing in terms o…
A laser-source bidirectional reflectometer that is fully automated and has angular resolution on the order of one degree has been designed and built. The direction of incidence and viewing can be independently varied over an entire hemisphere except for directions more than 77.5° from the normal, and the two direction…
The surface oxide structure of several metals and alloys has been examined by X-ray photoelectron spectroscopy (ESCA). The technique facilitates the measurement of oxide thickness, when less than ∼5 nm, such as Al2O3 on Al and SnO on Sn, by a combination of chemical shift and electron escape depth. The oxidation state…
Provision of beta-galactosidase (GZ) under defined conditions of dose and time can either help or suppress a subsequent response to trinitrophenyl (TNP)-GZ in CBA/J mice. The optimal helper effect occurs when 10(7) spleen cells from mice primed 9 or more days previously with 10 mug GZ are adoptively transferred to irr…
Abstract Partial chemical and X-ray analyses of specimens taken serially from three different rock types from the St. Austell granite show that potash feldspar is hydrothermally altered to a micaceous mineral. Sodic plagioclase alters to mica, montmorillonite and kaolinite. Furthermore, in the latter case the micaceou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt-boron clustersVernon R. Miller and Russell N. GrimesCite this: J. Am. Chem. Soc. 1976, 98, 6, 1600–1601Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https://pubs.acs.org/doi/10.1021/ja00422a064https:/…
Abstract The thermal decomposition of [Fe(bipy)3]Cl2·5H2O in nitrogen was investigated by means of Mössbauer spectroscopy. Two isomers of Fe(bipy)Cl2 were found to occur in the decomposition sequence; one of them appears to be identical with the rose-red form of Fe(bipy)Cl2 prepared by the wet process. The structures…
Abstract We have determined the cause for the covulcanization behavior of NBR-EPDM blends in TETD accelerator-lead oxide activator formulations. The key lies in the fact that the lead salts of TETD are insoluble in both polar and nonpolar materials. This insolubility would remove the thermodynamic driving force for cu…
The low‐frequency dielectric characteristics of soda‐lime and sodium‐silicate glasses were determined as a function of temperature, electrode materials, surface condition, and specimen thickness. The resulting large dielectric constant (often called electrode polarization) was dependent on surface condition of the gla…
A theoretical study of water tree mechanism is described. Microscopic analyses (1),(2) of water trees revealed that they are composed of many water-filled micro-voids which are less than several microns in diameter. The mechanism of the void generation is explained by the thermo-dynamics in which the electric field is…
SUMMARY A morphological study of resting spores in five marine planktonic diatom species using electron microscopy indicates that Bacteriastrum delicatulum Cleve and Leptocylindrus danicus Cleve spores bear little resemblance, to their vegetative cells. Detonula confervacea (Cleve) Gran and Stephanopyxis turris (Grev.…