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A non‐Arrhenius segregation isotherm is derived which includes the change in the heat of segregation with surface coverage due to impurity—impurity interactions. It is shown that a linear dependence of log ( X s ) on the reciprocal temperature, where X s is the surface atomic ratio, can derive either from a constant h…
A porous glass‐ceramic in the CaO–TiO 2 —P 2 O 5 system has been prepared by crystallization and subsequent chemical leaching of the corresponding glass. By applying a two‐step heat treatment to 45CaO · 25TiO 2 · 30P 2 O 5 glasses containing a few mol% of Na 2 O, volume crystallization results in the formation of dens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution and solid state characterization of europium and gadolinium Schiff base complexes and assessment of their potential as contrast agents in magnetic resonance imagingPaul H. Smith, J. R. Brainard, D. E. Morris, G. D. Jarvinen, and R. R. RyanCite this: J. Am. Chem. Soc…
We show that a sufficiently large ac electric field reorients the smectic layers irreversibly in chiral smectic-C liquid crystals. Using uniformly aligned samples, prepared by unidirectional buffing, it is demonstrated that at a given temperature the layers tilt away from the buffing axis, b^, by an angle equal to the…
The hypernetted-chain (HNC) approximation is solved for fluids of dipolar hard ellipsoids and the structural, thermodynamic, and dielectric properties of the isotropic phase are discussed in some detail. Both prolate and oblate particles are considered and the isotropic–nematic transition is investigated using density…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatization of hydrocarbons by oxidative dehydrogenation catalyzed by the mixed addenda heteropoly acid H5PMo10V2O40Ronny Neumann and Manfred LisselCite this: J. Org. Chem. 1989, 54, 19, 4607–4610Publication Date (Print):September 1, 1989Publication History Published onlin…
Cu is studied as a candidate for low-resistance VLSI interconnection. Simulation studies show that for effective channel length less than 0.5 mu m, the RC time constant of interconnection is a major part of the total delay. By reducing the resistivity of the interconnect, the operating speed can be increased by more t…
Abstract From the energy band approximation of K RONIG and P ENNEY and T AMM'S model of surface states a contribution of the electrons localized at the surface to the surface tension of a solid has been deduced. The results illustrate the difference between the surface tension and the surface energy in the case of a s…
The following magnetic properties were determined for X 52, X 60, X 70, and X 80 grade linepipe steels: magnetic induction as a function of magnetic field strength in the form of hysteresis loops, coercive force and saturation magnetisation. In addition, the following physical properties were determined: coefficient o…
Abstract A systematic analysis of the IR and Raman spectra of dipotassium tartrate hemihydrate (K 2 C 4 H 4 O 6 · ½H 2 O) in terms of the standard frequency correlations, deuteration shift and typical nature (with respect to intensity and width) of bands due to different modes is reported. The bands due to the interna…
Abstract Holtite, (Si 2.25 Sb 0.75 )B[Al 6 (Al 0.43 Ta 0.27 □ 0.30 )O 15 (O,OH) 2.25 ], is orthorhombic a = 4.6914(5), b = 11.896(2), c = 20.383(4)Å, space group Pnma . Full-matrix least-squares refinement yielded a final R = 0.030, for 1664 reflections with I ⩾ 3σ(I). Its crystal structure is closely related to that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComment on the thermal decomposition of anisole and the heat of formation of the phenoxy radicalM. H. BackCite this: J. Phys. Chem. 1989, 93, 18, 6880–6881Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 September 19…
Methanation of a 9/1 mixture of H2/CO at 180°C has been studied by transient techniques in a gradientless microreactor, The use of isotopic techniques and temperature programmed reduction (TPR) made possible the measurement of adsorbed CO, of a reactive carbon Cα and of an inactive carbon Cβ. As little as 0.04-0.06 mo…
This reproduction was made from a copy of a document sent to us for microfilming.While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted.The following explanation of techniques is provide…
In this study the corrosion behavior of porous type(1) 316L stainless steel has been evaluated and compared to that of conventionally made wrought stainless steel. The corrosion behavior of this porous material was investigated by potentiodynamic anodic polarization, open-circuit potential measurements, and identifica…
Type I collagen purified from calf skin was further separated into monomeric and oligomeric fractions and characterized with gel electrophoresis and measurement of solution viscosity. The thermal stabilities of the triple-helical structure of the collagen molecules of these preparations and the fibrils assembled there…
By modifying 13Cr–4Mn (wt-%) white cast iron with boron and rare earth (RE)–Si complex, the carbide morphology of the iron can be changed from interconnected, coarse clusters of rods into a parallel distribution of isolated, fine rods, and the impact toughness of the iron can reach 6–7 × 104 J m−2. In a pin wear test,…
The electrochemical, spectroscopic, and structural properties of passive layers on Ni(100) grown either electrochemically in aqueous 10 m M HClO 4 or by dosing with gaseous oxygen in ultrahigh vacuum (UHV) were compared using a UHV‐electrochemical transfer system equipped for x‐ray photoemission spectroscopy (XPS), lo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear viscosity of liquid sulfur near the polymerization temperatureJ. Ruiz-Garcia, E. M. Anderson, and S. C. GreerCite this: J. Phys. Chem. 1989, 93, 19, 6980–6983Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 Sep…
The initiation and propagation of stress corrosion cracking (SCC) of high alloys in sour gas environments were investigated mainly from the viewpoint of cathodic reactions. The most probable cathodic reaction to support the metal dissolution in the pitting and/or cracking process was identified by means of electrochem…