Materials Literature
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The sequence of precipitation and its kinetics in 17–4 PH (precipitation hardening) stainless steel were studied by observing the electrical resistivity and microstructure of the alloy during isothermal aging at various temperatures in the range 320–600°C. By the absence of an incubation period for the onset of precip…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate minimum in solution crystallization of long paraffinsS. J. Organ, G. Ungar, and A. KellerCite this: Macromolecules 1989, 22, 4, 1995–2000Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989https://pubs.acs.or…
We investigate functions u: \mathbf R^n → \mathbf R which minimize a variational integral \int \mathrm{F}(x,\:u(x),u_{x}(x))dx where \mathrm F: \mathbf R^n × \mathbf R × \mathbf R^n → \mathbf R is periodic in (x, u) \in \mathbf R^{n + 1} and uniformly convex in u_x \in \mathbf R^n . We restrict attention to non-selfin…
Dielectric properties and structural characteristics of BaTiO 3 ceramics are significantly influenced by small addition (2 wt%) of ZrO 2 . SEM and TEM observations revealed enhanced microstructural uniformity and retarded grain growth depending on sintering temperature. Above 1320°C, Zr diffusion into the BaTiO 3 latt…
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We consider the effects of impurities on the velocity selection of a needle crystal, in the small thermal and solutal Peclet numbers. As in the case of the growth in a pure melt, steady solutions for needle crystals are found only if surface tension is anisotropic. When anisotropy is small, the variation of ${\ensurem…
Article The High Temperature Corrosion of Metals in Sulfidizing-Oxidizing Environments: A Critical Review was published on April 1, 1989 in the journal High Temperature Materials and Processes (volume 8, issue 3).
Liposomal gadolinium diethylenetriaminepentaacetic acid (DTPA) encapsulated within 70- and 400-nm vesicles was tested as a contrast agent for magnetic resonance (MR) imaging of the liver in rats with hepatic metastases. Liposomal Gd-DTPA caused significant improvement in contrast between liver and tumor (P less than .…
The design of a planar, thin-film, multijunction thermal converter (MJTC) on a silicon chip containing a window with a SiO/sub 2/ membrane for low heat conductance underneath the thermal element is described. This design offers the possibility of mass production of MJTCs. Typical relative AC-DC transfer uncertainties…
The photoelectrochemical behavior of electrochromic nickel hydroxide films in 1 M KOH is reported. Cathodic photocurrent was obtained from reduced films which behave as p‐type semiconductors. The effective bandgap of the reduced phase is estimated to be 3.6–3.9 eV, although optical absorbance and photoaction data indi…
The materials requirements for nonlinear-optical applications, including electro-optics, second-harmonic generation, and all-optical signal processing, are discussed. The status of organic materials is reviewed in light of these requirements, along with the needs for future research.
Synthese des homo- et copolymeres par voie cationique. Mise en evidence de deux transitions vitreuses dans les copolymeres
An interpretation of current‐time transients describing anodic oxide film growth on metals is presented. When the rate of oxide film growth is controlled by ion conduction under high electric field, the classical theory of Cabrera and Mott leads to shallow curvature in plots of vs. . Such data can be linearized by usi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanions derived from tungstosilicate, A-.beta.-SiW9O3410-: synthesis and crystallographic and tungsten-183 NMR characterization of Si2W18Zr3O71H311-, including its organic solvent soluble Bu4N+ saltRichard G. Finke, Brian Rapko, and T. J. R. WeakleyCite this: Inorg. Ch…
Localized corrosion of stainless steels (SSs) has often occurred in newsprint paper machines, despite the low chloride concentration in the process water. This is now known to be caused by thiosulfateions, which can cause pitting of AISI 304 steel without assistance from chloride if the sulfate-to-thiosulfate ratio is…
The humidity‐sensitive characteristics of La 3+ ‐doped and undoped specimens were investigated at 400°C as a function of water vapor pressures. The conductivities of the specimens increased about one order of magnitude over the entire water vapor pressure range by the partial substitution of La 3+ ions for Sr 2+ in ,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotomodulation of polypeptide conformation by sunlight in spiropyran-containing poly(L-glutamic acid)F. Ciardelli, D. Fabbri, O. Pieroni, and A. FissiCite this: J. Am. Chem. Soc. 1989, 111, 9, 3470–3472Publication Date (Print):April 1, 1989Publication History Published onli…
Surfaces of commercial polyurethanes (PUs) were modified by poly(ethylene oxide) (PEO) grafting and/or heparin immobilization for long-term biomedical applications. PU surfaces were treated with diisocyanate and then reacted with PEO or heparin. The heparin immobilized by various methods on the PU surface was very sta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereoregularity in synthetic β-hydroxybutyrate and β-hydroxyvalerate homopolyestersSteven Bloembergen, David A. Holden, Terry L. Bluhm, Gordon K. Hamer, and Robert H. MarchessaultCite this: Macromolecules 1989, 22, 4, 1656–1663Publication Date (Print):April 1, 1989Publicati…
Gadolinium diethylenetriaminepentaacetic acid (DTPA) has not proved particularly useful for hepatosplenic magnetic resonance imaging. However, by entrapping the Gd-DTPA within lipid vesicles, one may exploit the ability of the reticuloendothelial system to endocytose particulates, permitting passive delivery of contra…