Materials Literature
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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.…
Homoserine kinase was purified to apparent homogeneity from a derepressed strain of Escherichia coli K12, using standard fractionation techniques. It is a dimer (Mr = 60000) composed of apparently identical polypeptide chains (Mr = 29000). Its amino acid composition and N-terminal sequence have been determined. L-Thre…
Abstract A theory of the stress‐induced crystallization of polymeric networks is presented which takes into account 1) the free energy of fusion, 2) crystal surface energies and 3) entropic changes in the amorphous sections of crystallizing chains. It is assumed that the vector running from one end to the other of the…
Abstract Polymerization behavior of hexamethylcyclotrisiloxane (D 3 ) in toluene solution with the use of benzyltrimethylammonium bis( o ‐p;henylenedioxy)phenylsiliconate as a catalyst, dimethyl sulfoxide as promoter, and adventitious moisture as initiator was investigated. The polymerization system gives a linear dif…
Abstract Poly(vinylidene fluoride) (PVdF) was irradiated by 60 Co γ‐rays with and without potassium hydroxide (KOH) under vacum. KOH tablets were added to absorb completely hydrogen fluoride (HF) which is the main volatile product of radiolysis of PVdF in the irradiation cell. In the presence of HF, the rates of radia…
The detailed mass-spectrometric evidence for our original findings [Magnusson et al. (1974) FEBS Lett. 44, 189-193] of ten gamma-carboxyglutamic acid residues in the N-terminal calcium-binding polypeptide of prothrombin is presented. The identification and sequence location of gamma-carboxyglutamic acid was made by el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyurethane Interpenetrating Polymer Networks. II. Density and Glass Transition Behavior of Polyurethane-Poly(methyl methacrylate) and Polyurethane-Polystyrene IPN'sS. C. Kim, D. Klempner, K. C. Frisch, and H. L. FrischCite this: Macromolecules 1976, 9, 2, 263–266Publicatio…
Abstract The surface morphology of a number of films of AB block copolymers of polydimethylsiloxane and polystyrene was examined by ESCA and contact angle measurements. In all cases the immediate surface is shown to consist of an essentially pure polydimethylsiloxane component. By comparing the intensities of elastic…
Abstract Although the reaction mechanism is obscure at present, 2,4,4,6-tetrabromo-2,5-cyclohexadien-1-one (2) was found to be a good reagent for the selective bromination of polyenes, that is, terminal double bond of geranyl and farnesyl cyanides was selectively brominated by merely being stirred with equimolar amoun…