Materials Literature
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<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…
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…
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…
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…
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…
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://…
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…
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…
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…
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…
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…
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…
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…
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…
Interactions between silicon nitride particles and hydroxide precipitates were investigated using electrophoresis measurements. Conditions under which stable suspensions of silicon nitride particles and flocculation and heteroflocculation of silicon nitride/hydroxide mixtures occur were Identified. On the basis of the…
Abstract If protein single crystals larger than those suitable for x‐ray analysis are obtained, various spectroscopic, thermal, mechanical, and electrical measurements become possible. To understand the factors governing the crystal size, tetragonal lysozyme crystals were grown in batches at 15°C from solutions of dif…
Abstract Upon shearing, some polymeric liquid crystals develop a particular texture, called “band texture,” consisting of fine equidistant black lines as viewed between crossed polarizers. In mesomorphic hydroxypropylcellulose–water solutions, these bands are due to relaxation of the shear. The band texture appears af…
By means of constant-temperature, constant-pressure molecular dynamics techniques, we simulate the melting and crystallization processes of a model system composed of 864 Lennard-Jones (LJ) particles under periodic boundary conditions. On heating an fcc crystal of LJ particles, it is ascertained that melting takes pla…
Abstract The study of infrared reflection spectra of SbSBr crystals necessitated redetermination of its structure and revision of its description, along the lines of the isostructural compounds BiSCl, BiSBr and SbSeI. The cell constants are: a = 8.2424(6), b = 9.7556(4), c = 3.9680(2) Å, Z = 4; space group Pnam . The…
Thin foils of polycrystalline α‐alumina were reacted with a potassium‐rich vapor at ≤900°C. Potassium β‐alumina formed along α‐alumina grain boundaries and protruded from holes in the foils. Conventional transmission electron microscopy was used to analyze the α‐alumina/β‐alumina phase boundary for possible orientatio…