Materials Literature
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Glasses are readily made from compositions containing up to 45 mol% PbO. The deviation of molar volume from ideality plotted vs composition shows a broad minimum at 70 to 80 mol% GeO 2 , similar to the behavior of the alkali‐GeO 2 glasses, indicating that the change in coordination of the Ge 4+ ion from 4‐ to 6‐fold o…
Abstract When ultrasound is applied to a liquid reacting system, the reaction rates are often increased. The application of ultrasonics, therefore, provides additional modes of accelerating the reaction rates which are usually not considered by conventional mechanisms. In an attempt to study the effect of ultrasonics…
Abstract Four soil profiles were sampled along a 550‐m toposequence traverse in São Paulo State, Brazil and were characterized with physical, chemical, mineralogical, and micromorphological analyses. The soils were classified and hypotheses were developed concerning their genesis based on soil differences observed. Th…
Abstract The spectral position of the absorption edge of n‐type Bi 2 Se 3 , single crystals was determined from reflectivity measurements on cleavage planes at nearly normal incidence of the radiation (E ⊥ c). A small reflectivity peak yields a maximum of the real part n 2 ‐ k 2 of the dielectric constant, which is co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermolysis of Poly[bis(trifluoroethoxy)phosphazene]H. R. Allcock and W. J. CookCite this: Macromolecules 1974, 7, 3, 284–290Publication Date (Print):May 1, 1974Publication History Published online1 May 2002Published inissue 1 May 1974https://pubs.acs.org/doi/10.1021/ma60039…
Secondary electron yields δPE due to primary electrons of kilo-electron-volts are estimated for various metals by measuring total electron yields δT in an UHV system and using a Monte Carlo calculation to derive δPE from δT. The dependences of δT/δPE as well as δPE on both the atomic number Z and primary energy are al…
We have partially purified homoserine kinase from a genetically derepressed strain of Escherichia coli K-12. The optimum pH of the enzyme-substrate reaction was 7.8 and the K(m) values for l-homoserine and adenosine 5'-triphosphate were both 3 x 10(-4) M. K(+) (or NH(4) (+)) as well as Mg(2+) were required for its act…
The hyperfine field and isomer shift at iron sites in dilute iron-base alloys containing Ge, As, Sn, and Sb impurities were determined by M\"ossbauer measurements. Similar information was obtained for the tin sites in $\mathrm{Fe}$ Sn alloys. These experimental data, together with those published earlier for Al, Si, a…
Abstract The physical properties and the chemical reactivity of the porphyrin macrocycle, whose formation can be rationalized by a simple statistical argument, are related in many respects to those of aromatic hydrocarbons. The reactivity of the porphyrin ligand in its metal complexes varies within wide limits because…
The deformation of high-density polyethylene with a single crystal texture by shear in directions perpendicular to the chain direction has been examined by wide-angle X-ray diffraction. It is found that samples can undergo either a martensitic transformation to a monoclinic cell, (100) [010] slip or (110) twinning dep…
This article is concerned with the electronic transport properties of the large group of solids (and also some liquids) which possess carrier mobilities from 10 cm2V-1sec-1 to many orders below that value. Its main aim is to trace the close relation between transport and localization. To this end the physical basis of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and structural and magnetic characterization of .beta.-di-u-hydroxo-bis [2-(2-dimethylaminoethyl)pyridine]dicopper(II) perchlorateDavid L. Lewis, Kenneth T. McGregor, William E. Hatfield, and Derek J. HodgsonCite this: Inorg. Chem. 1974, 13, 5, 1013–1019Publicati…
On the basis of proposals by Cahn [Acta Met. (1962). 10, 179-183] for cubic crystals, a coherent elastic model is developed which makes it possible for the orientations of exsolution boundaries formed either by spinodal decomposition or homogeneous nucleation to be predicted. The elastic energy for the coherent exsolu…
ABSTRACT The mineralogy and geochemistry of clastic sediments in the 1000 m thick Lower Palaeozoic marine sequence of the Oslo Region is discussed on the basis of 200 chemical (XRF) and mineralogical (X‐ray diffractometer) analyses. The composition of these sediments is considered to largely be a function of the relat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic routes to halomethyl vinylsilanesGilbert Stork, Michael E. Jung, Ernest Colvin, and Yves NoelCite this: J. Am. Chem. Soc. 1974, 96, 11, 3684–3686Publication Date (Print):May 1, 1974Publication History Published online1 May 2002Published inissue 1 May 1974https://pu…
The preliminary check-list of British marine diatoms first appeared in this Journal about 20 years ago (Hendey, 1954), and since that time many advances have been made in the study of these organisms. First, the known flora has been extended very considerably (Hendey, 1964, 1973) and much has been added to our knowled…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and Deformation Mechanism of Segmented Poly(urethaneureas) in Relation to Spherulitic Crystalline TexturesItsuro Kimura, Hideaki Ishihara, Hiroshi Ono, Nori Yoshihara, Shunji Nomura, and Hiromichi KawaiCite this: Macromolecules 1974, 7, 3, 355–363Publication Date…
A series of poly(ethylene terephthalate) fibers of various molecular weights was first drawn to a practical maximum draw ratio and then allowed to contract thermally under tension for 10, 20, and 38%. These contracted fibers exhibit a high degree of plasticity even when tested at—100°C and extension rates of 1300%/sec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Toluene SolutionsTakeji Hashimoto, Kikuo Nagatoshi, Akira Todo, Hirokazu Hasegawa, and Hiromichi KawaiCite this: Macromolecules 1974, 7, 3, 364–373Publication Date (Print):May 1, 1974Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic studies for tetraphenylporphyrincobalt(II) complexes of carbon monoxide, nitrogen oxide, molecular oxygen, methylisonitrile, and trimethyl phosphite, and a bonding model for complexes of carbon monoxide, nitrogen oxide, and molecular oxygen with cobalt(II) and…