Materials Literature
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The article is divided in two parts. In part I we review the present state of knowledge on the problem of the transition to turbulence in isotropic liquids and we discuss analogies/differences with the case of nematics. In the well known Rayleigh-Bénard case, experiments on ordinary liquids show that one must distingu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of IR extinction coefficients for linear- and bridged-bonded carbon monoxide on supported palladiumM. A. Vannice and S. Y. WangCite this: J. Phys. Chem. 1981, 85, 17, 2543–2546Publication Date (Print):August 1, 1981Publication History Published online1 May 2002…
Raman spectra were measured on B 2 O 3 ‐SiO 2 glasses heat‐treated at different temperatures and for different periods of time. It was found that the intensity ratio of the 810‐ and 475‐cm −1 bands depended on the thermal history and composition of glass. The intensity vs heat‐treatment temperature curve exhibited a m…
Cultivated cells form a valuable model system for studies on the effects of various preparative protocols for scanning electron microscopy (SEM). The various effects of each preparative step can be followed in detail in the light microscope and no diffusion gradients complicate the fixation and other procedures as in…
This article reviews published data on the mechanical properties of additively manufactured metallic materials. The additive manufacturing techniques utilized to generate samples covered in this review include powder bed fusion (e.g., EBM, SLM, DMLS) and ...Read More
We outline an improved root-finding algorithm necessary for the solution of the eigenvalue equation associated with the diffraction formalism for lossy lamellar gratings. A numerical example is presented, demonstrating the adequacy of this technique for a highly-conducting aluminium grating.
The dielectric function epsilon identical with epsilon(1) + iepsilon(2) has been determined for Al(2)O(3) films prepared by electron beam evaporation, in the 5-50-microm wavelength range. The data were extracted from spectrophotometric recordings of transmittance and reflectance by use of a novel technique. Supplement…
Abstract Clay samples from shales and bentonites in the Mancos Shale (Cretaceous) and its stratigraphic equivalents in the southern Rocky Mountain and Colorado Plateau have been analyzed by X-ray powder diffraction methods. The major clay in the shales is mixed layered illite/smectite, with 20–60% illite layers. The r…
Abstract The viscosity coefficients η 1 , η 2 , η 3 and η 12 of 4‐n‐pentyl‐4'‐cyanobiphenyl, 4‐n‐octyl‐4'‐cyanobiphenyl, 4‐methoxy‐4'‐n‐butylazoxybenzene and an aromatic ester mixture were determined in the nematic phase region. Except for 4‐n‐octyl‐4'‐cyanobiphenyl, the viscosity coefficients of the liquid crystals s…
Pyrolysis products from bacterial polyesters, poly-β-hydroxybutyrate (PHB), and from a heteropolyester (β-hydroxyvalerate and β-hydroxybutyrate) were identified. Different physical forms of PHB were studied: PHB purified by dissolution in chloroform, native granules of PHB, and PHB in bacterial cells. The products wer…
This article reviews published data on the mechanical properties of additively manufactured metallic materials. The additive manufacturing techniques utilized to generate samples covered in this review include powder bed fusion (e.g., EBM, SLM, DMLS) and ...Read More
The 2p and 3p core level widths for the metals 22 Ti- 30 Zn have been studied by photoelectron spectroscopy. The L 2 L 3 M 45 Coster-Kronig rate is found to have a maximum for Co and Ni. The Coster-Kronig broadening seems to be a simple function of the kinetic energy of the emitted electron. Absolute 2p level widths h…
The paper deals with the models for estimating the life of electrical insulation under multiple stress conditions. In a first approach, simple models, the inverse-power law and the exponential, are considered for electrical aging; they are combined with the Arrhenius model to find the life equation of insulating mater…
The amplitude of the orientational dielectric dispersion of impure polycrystalline ice Ih has been measured at temperatures down to 133 K in an attempt to find evidence for an ordering transition. The Curie–Weiss temperature is 6.2±1.7 K and so, within the experimental precision, there is no significant evidence that…
A rigorous modal theory describing the diffraction properties of a finitely conducting lamellar grating is presented. The method used is the generalization to lossy structures of an earlier formalism for the dielectric lamellar grating. Sample results of the method are given, demonstrating its accuracy and its ability…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonomeric metaphosphatesF. H. WestheimerCite this: Chem. Rev. 1981, 81, 4, 313–326Publication Date (Print):August 1, 1981Publication History Published online1 May 2002Published inissue 1 August 1981https://pubs.acs.org/doi/10.1021/cr00044a001https://doi.org/10.1021/cr00044a0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of molecular structure on mesomorphism. 12. Flexible-center Siamese-twin liquid crystalline diesters - a "prepolymer" modelAnselm C. Griffin and Thomas R. BrittCite this: J. Am. Chem. Soc. 1981, 103, 16, 4957–4959Publication Date (Print):August 1, 1981Publication Hist…
Five mesomorphic phases are described in several disc-like liquid-crystals. They are hexalkanoyloxy benzenes, triphenylenes or truxenes, hexa-alkoxy triphenylenes, hexa-benzoates of triphenylene. Several of these compounds exhibit a complex polymorphism. Informations on the structures of these phases have been obtaine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of nickel-molybdenum-.gamma.-aluminum oxide catalysts by x-ray photoelectron and Raman spectroscopy. Comparison with cobalt-molybdenum-.gamma.-aluminum oxide catalystsP. Dufresne, E. Payen, J. Grimblot, and J. P. BonnelleCite this: J. Phys. Chem. 1981, 85, 16, 2344–235…
The dc linear electro-optic effect and the x-ray crystal structure of the organic molecular solid 2-methyl-4-nitroaniline (MNA) have been studied. Of two crystal orientations measured, one polar orientation was found to have an exceptionally large figure of merit for electro-optic phase retardation, comparable to that…