Potential Corrosion of Metals by Atmospheric Organic Acids
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Correlation of Mixed Layer Growth in a Double-Diffusive, Salt-Stratified System Heated From Below
Although many mixed layer growth correlations have been developed for stratified solutions which are eroded by mechanically driven mixed layers, little has been done to determine their applicability to solutions for which erosion is thermally driven. In this study entrainment rates have been determined from measuremen…
Influence of Citric and Tannic Acids on Hydroxy-Al Interlayering in Montmorillonite
Abstract The formation of hydroxy-Al-interlayered montmorillonite was affected by complexing organic acids. Montmorillonite (<2.0 μ m) was aged for three months at an initial pH of 5.0 or 6.0 in AlCl 3 solutions containing citric or tannic acid at organic acid/Al molar ratios from 0 to 1.0. The Al/clay ratio in the…
Effects of heterogeneous sink distribution on void swelling
Swelling rates are calculated for two types of material with heterogeneous distributions of dislocations and voids, namely copper irradiated with neutrons to low dose at 250°C and heavily cold-worked copper irradiated with 1 MeV electrons in a HVEM at 250°C. Both materials are considered to consist of non-interacting…
Surface enhanced resonance Raman study on fluorescein dyes
Abstract Fluorescein and its derivatives fluoresceinamine and diiodofluoresceiniodoacetamide have been studied by surface enhanced resonance Raman spectroscopy (SERRS). Adsorption of the dyes at the silver/electrolyte interface requires attractive interactions between polar side groups (such as NH 2 , OH and COOH) wit…
Reaction-enhanced sintering of platinum thin films during ethylene oxidation
The sintering of sputter-produced, silica-supported platinum thin films was studied using electron microscopy and x-ray diffraction following treatments in both reactive (ethylene oxidation—O2+C2H4) and nonreactive atmospheres (vacuum, O2, N2, C2H4, CO2, H2O). Sintering behavior in nonreactive atmospheres (thermal sin…
High Purity Magnesium AM60 Alloy: The Critical Contaminant Limits and the Salt Water Corrosion Performance
<div class="htmlview paragraph">Standard salt spray corrosion tests have been used with controlled purity AM60 castings to define the critical iron, nickel, and copper contaminant levels below which excellent corrosion performance can be obtained. As previously observed with the AZ91 alloy, the iron solubility a…
Differential excitation cross section of atomic oxygen by electron impact: (³P‐¹D transition)
Absolute differential excitation cross sections of atomic oxygen (³P‐¹D transition) by electron impact have been measured by a crossed‐beam method. Atomic oxygen was generated by a thermal dissociation method. The energy and angular range covered were from 7 to 30 eV and from 30° to 150°, respectively. A few theoretic…
Galvanic Corrosion Prediction Using Long-and Short-Term Polarization Curves
Long-term potentiostatic polarization curves of up to 120 days duration were developed for the following materials in seawater: 90:30 coppernickel (C70600), Monel(1) 400 (N04400), Inconel(2) 625 (N06625), Navy M-bronze (C92200), nickel-aluminum bronze (C95800), HY-80 steel, titanium 50 (R50400), 70:30 copper:nickel (C…
Dynamics of spin-state interconversion and cooperativity for ferric spin-crossover complexes in the solid state. 5. Variable-temperature spectroscopic, magnetic, and single-crystal x-ray structural characterizations of the spin-state and order-disorder transformations of a Schiff base complex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of spin-state interconversion and cooperativity for ferric spin-crossover complexes in the solid state. 5. Variable-temperature spectroscopic, magnetic, and single-crystal x-ray structural characterizations of the spin-state and order-disorder transformations of a S…
Superplastic deformation characteristics of microduplex Ti–6Al–4V alloy
A study has been made of the superplastic tensile behaviour of a microduplex Ti–6AI–4V alloy in the temperature range 760–940°C. Maximum superplastic elongations were obtained for a temperature of 880°C at which the volume fraction of β–phase was approximately 0·4. At temperatures below about 850°C, the main microstru…
Structure, stability, and bonding in cyclodiphosphazene and cyclotriphosphazene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, stability, and bonding in cyclodiphosphazene and cyclotriphosphazeneGeorges. TrinquierCite this: J. Am. Chem. Soc. 1986, 108, 4, 568–577Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissue 1 February 1986https://…
Method for variation of grain size in studies of gas-solid reactions involving calcium oxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethod for variation of grain size in studies of gas-solid reactions involving calcium oxideRobert H. Borgwardt, Nancy F. Roache, and Kevin R. BruceCite this: Ind. Eng. Chem. Fundamen. 1986, 25, 1, 165–169Publication Date (Print):February 1, 1986Publication History Published…
Experimental criterion for the crystallization regime in polymer crystals grown from dilute solution: Possible limitation due to fractionation
Abstract By integration of equations previously derived by Frank, the growth rate of polymer crystals is shown to be dependent on their size, provided that the persistence length L p or the kinetic length L k = (2 g / i ) 1/2 are significantly larger than the primary nucleus. A new method of decorating the fold surfac…
IR transition moment directions in matrix-isolated dimethylsilylene and 1-methylsilene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIR transition moment directions in matrix-isolated dimethylsilylene and 1-methylsileneGerhard. Raabe, H. Vancik, Robert. West, and Josef. MichlCite this: J. Am. Chem. Soc. 1986, 108, 4, 671–677Publication Date (Print):February 1, 1986Publication History Published online1 May…
Heating in crystalline solids due to rapid deformation
We present experimental evidence that during rapid deformation of at least some crystalline and polymeric solids heat is generated at unexpectedly high temperatures beginning essentially at the moment deformation begins. The heat was observed by fast infrared sensors. Both the initial infrared emissions and the appare…
Quadruple reentrance (nematic-smectic-Ad-nematic-smectic-Ad-nematic-smectic-A1) from the frustrated spin-gas model of liquid crystals
The microscopic ``spin-gas'' model reproduces and physically explains the sequence of liquid-crystal phases, nematic--smectic-${A}_{d}$--nematic--smectic-${A}_{d}$ --nematic--smectic-${A}_{1}$, which was observed with decreasing temperature in recent experiments. The microscopic frustration inherent to smectic structu…
Dislocation and void segregation in copper during neutron irradiation
High-purity (99·999%) and fully annealed copper specimens have been irradiated in the DR-3 reactor at Ris⊘ to doses of 1 × 1022 and 5 × 1022 neutrons (fast)m−2 (2 × 10−3 dpa and 1 × 10−2 dpa, respectively); the irradiation experiments were carried out at 250°C. The irradiated specimens were examined by transmission el…
Power distribution techniques for VLSI circuits
The onchip power distribution problem for highly scaled technologies is investigated. Metal migration and line resistance problems as well as ways to optimize multilayer metal technology for low resistance, low current density, and maximum wirability are also investigated. Fundamental lower limits and the limiting fac…
Cloning, overproduction, and purification of the B2 subunit of ribonucleoside-diphosphate reductase
The nrdB gene, which encodes the B2 subunit of Escherichia coli ribonucleotide reductase (EC 1.17.4.1), was cloned into multicopy plasmid pSPS2. This vector, which contains the pL promoter of bacteriophage lambda and the tetracycline resistance gene of pBR322, was transformed into a lysogenic host with a thermolabile…