Materials Literature
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Abstract The photo‐oxidation of PVC has been studied over the temperature range 30–150°C. Initiation with ultraviolet (2537A) radiation has been correlated with the presence of minute amounts of ozone. The contribution of atomic oxygen and singlet oxygen ( 1 Δ g ) molecules to the initiation mechanism is discussed. Th…
A set of linear inequalities for the reduced two-body density matrix is presented. The general problem of finding all such inequalities is discussed. It is shown that all of the linear inequalities found so far for ensemble representability may be written as a single family of inequalities.
The aging phenomenon in tetragonal ferroelectric bairum titanate was investigated by optical microscopy and by electrical measurements. Transmission electron microscopy was used to observe in detail domain reactions which occurred during aging. Aging may be characterized as an exhaustion‐type process because of the in…
Abstract α-Isopropylmalate synthase, the first enzyme in the biosynthesis of leucine, was purified to homogeneity from extracts of strain CV-19 of Salmonella typhimurium. From gel filtration and disc gel electrophoresis experiments it was deduced that the enzyme can exist in two physically distinguishable forms and th…
The possible mechanisms of action of bovine pancreatic ribonuclease are discussed in the light of the detailed knowledge of the geometry of the active site that has been derived from studies of inhibitor binding by X-ray diffraction and nuclear magnetic resonance. When combined with a knowledge of the mechanism of pho…
The internal friction of silicate glasses containing mixtures of Li‐Na, Li‐K, Li‐Rb, Li‐Cs, Na‐K, Na‐Rb, Na‐Cs, and K‐Rb was measured from ‐180° to 500°C at a frequency of 0.4 Hz. Values for the density, index of refraction, and dynamic shear modulus are also reported. With small additions of a second alkali, a new in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and properties of .mu.-oxobis(tetraphenylporphineiron(III)Everly B. Fleischer and T. S. SrivastavaCite this: J. Am. Chem. Soc. 1969, 91, 9, 2403–2405Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1969ht…
Abstract The reaction between hydrogen gas and selenium dissolved in liquid tellurium is described as follows H 2 (g) + Se ⇄ H 2 Se(g) The kinetics of this reaction have been investigated at temperatures ranging between 525 and 625°C and at concentrations of selenium varying between 250 and 3,300 ppm. Under all condit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiamond-windowed cell for spectrophotometry of molten fluoride saltsLouis M. Toth, Jack Phillip. Young, and George Pedro. SmithCite this: Anal. Chem. 1969, 41, 4, 683–685Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of Interfacial Area in Sulfuric Acid AlkylationF. B. SprowCite this: Ind. Eng. Chem. Process Des. Dev. 1969, 8, 2, 254–257Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1969https://pubs.acs.org/doi/10.1021/i…
Subsurface residual stress measurements were made on SAE 52100 steel inner races from 207-size deep-groove ball bearings in which ΔH (ball hardness minus race hardness) ranged from −1.1 to 3.5 points Rockwell C. These bearings had been run at an inner-race speed of 2750 rpm and a radial load of 1320 lb producing maxim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeries of rare earth garnets Ln3+3M2Li+3O12 (M=Te, W)H. M. KasperCite this: Inorg. Chem. 1969, 8, 4, 1000–1002Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1969https://pubs.acs.org/doi/10.1021/ic50074a058https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox chemistry of the system O2-O2--O22--O2- in fused saltsPier G. Zambonin and Joseph JordanCite this: J. Am. Chem. Soc. 1969, 91, 9, 2225–2228Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1969https://pubs.acs…
The luminescence of the unactivated and Bi3+- and Eu3+-activated compounds ABO4 (A is Sc, In; B is P, V, Nb) is reported and compared with the luminescence of the corresponding rare-earth and yttrium compounds. The ScNbO4 shows a weak, blue emission, ScVO4 a blue-green, and InVO4 a green emission. The other host latti…
When a hydrostatic pressure is applied to a metal containing particles or inclusions of different elastic constant, the local shear stresses which develop can be large enough to cause the interface between the particle and the metal matrix to emit dislocations. We have measured the pressure (from which we calculate th…
Abstract Die reinen Phasen oxydierter Nickelhydroxide, die auf der Nickelhydroxidelektrode im alkalischen Akkumulator auftreten können, wurden hergestellt, ihre kristallographischen Daten und ihr chemisches Verhalten untersucht und Umwandlungsbedingungen ermittelt.
The adhesion properties of polymers are known to be influenced by both intermolecular forces operative at the interface and the rheological history of both bonding and unbonding. Recent adsorption and viscoelastic theories of adhesion and cohesion are implemented in a comprehensive examination of these phenomena. Eigh…
Abstract Low temperature gaseous plasmas of ammonia or nitrogen–hydrogen mixtures contain NH 2 groups, or precursors thereof, formed in the plasma, which experimental evidence strongly suggests, can add to various polymer surfaces. The plasmas were established in the 0.3–1.5 torr range by radiofrequency (13.56 MHz) e…
An experiment is described which confirms the theory of the distortion of a cholesteric structure by a magnetic field. Field effects in a sample of p-azoxyanisole doped with cholesteryl acetate were viewed directly with a microscope, and the pitch of the helical structure was measured as a function of field strength.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiamagnetic susceptibility exaltation in hydrocarbonsHyp J. Dauben Jr., James Dennis Wilson, and John L. LaityCite this: J. Am. Chem. Soc. 1969, 91, 8, 1991–1998Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1969…