Spatial filter for increasing the depth of focus
The Strehl ratio, in the form of McCutchen's theorem, is employed to design a spatial filter that increases the depth of focus. Computer-simulated images show the increment in focal depth.
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Mechanisms of Electroless Metal Plating : II . Formaldehyde Oxidation
A detailed investigation of the decomposition of formaldehyde was carried out to account for the fact that formaldehyde decomposition on Group VIII metals, e.g. , palladium, occurs without simultaneous hydrogen generation, while on Group I B metals, e.g. , copper, formaldehyde decomposition is accompanied by hydrogen…
Polyethylene-based water-equivalent phantom material for X-ray dosimetry at tube voltages from 10 to 100 kV
A water-equivalent plastic material RW-1, in the form of thin foils as well as of thicker sheets, has been produced by melting powdered polyethylene together with CaCO3 and MgO. The mixture has been developed in a three-step procedure, starting with provisional mixtures and using data from their measured attenuation c…
An XPS investigation of titanium dioxide thin films on polycrystalline platinum
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn XPS investigation of titanium dioxide thin films on polycrystalline platinumC. M. Greenlief, J. M. White, C. S. Ko, and R. J. GorteCite this: J. Phys. Chem. 1985, 89, 23, 5025–5028Publication Date (Print):November 1, 1985Publication History Published online1 May 2002Publi…
Stokes flow past compound multiphase drops: the case of completely engulfed drops/bubbles
In this paper the translatory motion of a compound drop is examined in detail for low-Reynolds-number flow. The compound drop, consisting of a liquid drop or a gas bubble completely coated by another liquid, moves in a third immiscible fluid. An exact solution for the flow field is found in the limit of small capillar…
Relationship between the fine structure of native cellulose and cellulose degradability by the cellulase complexes of Trichoderma reesei and Clostridium thermocellum
The initial rate of hydrolysis of six commercially available native (type l) celluloses was determined for the crude cellulase complexes of the thermophilic anaerobic bacterium C. thermocellum and the mesophilic fungus T. reesei. These rates were then compared with certain physical features of the substrates in an att…
Magnetic exchange interactions in binuclear transition-metal complexes of a binucleating clathrochelate ligand
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in binuclear transition-metal complexes of a binucleating clathrochelate ligandMark D. Timken, William A. Marritt, David N. Hendrickson, Robert A. Gagne, and Ekk SinnCite this: Inorg. Chem. 1985, 24, 24, 4202–4208Publication Date (Print):Novemb…
Highly efficient sodium hypochlorite olefin epoxidations catalyzed by imidazole or pyridine "tailed" manganese porphyrins under two-phase conditions. Influence of pH and of the anchored ligand
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly efficient sodium hypochlorite olefin epoxidations catalyzed by imidazole or pyridine "tailed" manganese porphyrins under two-phase conditions. Influence of pH and of the anchored ligandFernando Montanari, Michele Penso, Silvio Quici, and Patrizia ViganoCite this: J. O…
Theory of the low-temperature phases in boracites: Latent antiferromagnetism, weak ferromagnetism, and improper magnetostructural couplings
A phenomenological theory of the magnetic and magnetoelectric properties of boracites is developed, using the Landau-Dzialoshinskii approach. An interpretation is proposed for the main distinctive features characterizing eleven members of this family of compounds, namely the symmetry changes, the magnetic and magnetoe…
Dual-mode transport of penetrants in glassy polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDual-mode transport of penetrants in glassy polymersGlenn H. Fredrickson and Eugene HelfandCite this: Macromolecules 1985, 18, 11, 2201–2207Publication Date (Print):November 1, 1985Publication History Published online1 May 2002Published inissue 1 November 1985https://pubs.ac…
Spectroelectrochemistry of a .mu.-nitrido-bridged iron phthalocyanine dimer
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroelectrochemistry of a .mu.-nitrido-bridged iron phthalocyanine dimerLawrence A. Bottomley, Jean Noel Gorce, Virgil L. Goedken, and Claudio ErcolaniCite this: Inorg. Chem. 1985, 24, 23, 3733–3737Publication Date (Print):November 1, 1985Publication History Published onl…
Metastable solid solutions in vapor deposited Cu–Cr, Cu–Mo, and Cu–W thin films
The equilibrium phase diagrams of Cu–Cr, Cu–Mo, and Cu–W show no measurable solid solubility except for a small solubility of Cr in solid Cu at higher temperatures. Even in the liquid state, the mutual solubilities in these systems are very limited. Simultaneous vapor deposition of elements on unheated substrates was…
Polymeric phthalocyanines and their precursors, 7. Synthesis and analytical characterization of polymers from 1,2,4,5‐benzenetetracarboxylic acid derivatives
Abstract Structurally uniform polymeric phthalocyanines 5a – e , containing imido end groups, were synthesized by reaction of different derivatives of 1,2,4,5‐benzenetetracarboxylic acid, 2a – d , with metal salts, urea and a catalyst. 5a – e were converted into polymers 3 , 4 and 6 , containing anhydride, carboxylic…
Inherent structure theory of liquids in the hard-sphere limit
Atomic pair correlation functions for liquids provide an image of temperature-dependent short-range order. If the thermal ensemble of atomic configurations is mapped (by steepest descent on the potential hypersurface) onto potential energy minima, the pair correlation function from the resulting transformed configurat…
Polymeric phthalocyanines and their precursors, 8. Synthesis and analytical characterization of polymers from 1,2,4,5‐benzenetetracarbonitrile
Abstract Polymers 3 were prepared by reaction of 1,2,4,5‐benzenetetracarbonitrile ( 2 ) or 2,3,9,10,16,17,23,24‐(29 H , 31 H )‐phthalocyanineoctacarbonitrile ( 5a ) with various metal salts or metals. The polymer structures were investigated by comparing their IR and UV/VIS spectra with those of 5 . Structurally unifo…
Transpassive Dissolution of Ni in Acidic Sulfate Media: A Kinetic Model
The transpassive dissolution of Ni in acidic sulfate media, including the influence of crystallographic orientation, was investigated. The surface plane had low index values, that is (100), (110), and (111). This study was largely based on the analysis of complex impedance. (100) and (110) specimens showed identical e…
Rubber-Thermoplastic Compositions. Part IX. Blends of Dissimilar Rubbers and Plastics with Technological Compatibilization
Abstract From this work, one can conclude that compositions which have excellent mechanical properties can be prepared by melt-mixing thermoplastic vulcanizates. (A thermoplastic vulcanizate is a composition containing vulcanized rubber particles dispersed in a thermoplastic. Such a composition is usually prepared by…
Paramagnetic resonance and local position ofCr3+in ferroelectricBaTiO3
EPR spectra of ${\mathrm{Cr}}^{3+}$, S=(3/2), substituting for ${\mathrm{Ti}}^{4+}$ are reported as a function of temperature T in all four phases of ${\mathrm{BaTiO}}_{3}$. In the three ferroelectric phases (FEP's), the principal axis of the Hamiltonian is always along the polar axis. There are two crystal-field term…
Magnetic properties of dimeric disubstituted-triazole copper(II) compounds. X-ray structure of bis[.mu.-3,5-bis(pyridin-2-yl)-1,2,4-triazolato-N',N1,N2,N"]bis[aqua(trifluoromethanesulfonato-O)copper(II)]
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of dimeric disubstituted-triazole copper(II) compounds. X-ray structure of bis[.mu.-3,5-bis(pyridin-2-yl)-1,2,4-triazolato-N',N1,N2,N"]bis[aqua(trifluoromethanesulfonato-O)copper(II)]Rob Prins, Paul J. M. W. L. Birker, Jaap G. Haasnoot, Gerrit C. Verschoo…
Structural Models for Some Liquid Crystalline Cellulose Derivatives
Abstract Models for helicoidal cholesteric structures are proposed for some cellulose derivative/solvent systems. The pitch of these structures is determined by independent methods as a function of temperature, concentration, solvent, degree of polymerization. The results are discussed on the basis of available theore…