Materials Literature
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An experimental program was conducted to determine the role of boric acid on the pitting behavior of alloy 600 steam generator tubes. The test solution consisted of 5620 wppm Cl−, 3984 wppm SO4=, and 500 wppm Cu++ yielding a Cl−/SO4= ratio of 1.4. Boric acid was added in amounts of 0, 50, 100, 200, 500, 1000, and 2000…
The fructose-1,6-bisphosphate aldolase gene of Drosophila melanogaster contains three divergent copies of an evolutionarily conserved 3' exon. Two mRNAs encoding aldolase contain three exons and differ only in the poly(A) site. The first exon is small and noncoding. The second encodes the first 332 amino acids, which…
Abstract The paper is concerned with the discussion of the different mechanisms proposed for plasma‐induced (initiated) polymerization. This new approach to polymer synthesis proceeds through a free radical mechanism, but presents some peculiar characteristics. The initiation reaction is practically instantaneous and…
<div class="htmlview paragraph">The demands for longer lifetimes of cars have meant that the durability of radiators has also become more important, particularly with regard to the resistance to external corrosion due to environmental pollution. In this paper corrosion mechanisms, as well as some preventive meas…
Abstract Infrared spectra of uniaxially drawn ß‐PVDF films under the influence of an electric field were registered. The direction and the strength of the applied field were changed in up to 13 cycles. The field‐induced frequency changes of the bands at 445 cm −1 (CF 2 ‐rocking) and 510 cm −1 (CF 2 ‐bending) were stud…
The crystal structure of anhydrous lithium formate, published recently by Kansikas and Hermansson, is in fact that of a quenchable high-temperature modification (LiHCOO-I). The low-temperature modification LiHCOO-II can be obtained by thermal dehydration of the monohydrate, LiHCOO · H 2 O , or by drying it over P 4 O…
Abstract Electrocatalytic reduction of l-cystine (CySSCy) was examined on glassy carbon electrodes coated with the title conductive polymer in which Pt, Pd, Cu, Ag, and Hg thiolates were fixed. Pt and/or Pd thiolate fixed in the polymer behaved as excellent electrocatalytic active sites for reductive cleavage of the s…
A test containing 19 mixed-oxide fuel pins was operated in the Experimental Breeder Reactor II (EBRII) at peak cladding temperatures near 800°C. Two test pins that had been designed to fail at ∼5 at. % burnup and two low-burnup environmental pins failed and then were operated in the run beyond cladding breach mode for…
The formation of coalesced oxide films on atomically clean polycrystalline chromium has been studied with Auger electron spectroscopy and secondary ion mass spectrometry at temperatures between 30C and 400C. The data are consistent with an initialed chemisorption of oxygen on the clean Cr followed by nucleation of chr…
The angular distributions of secondary electrons (incuding Auger electrons) of different energies emitted from polycrystalline silver bombarded with primary electrons (E = 1000 and 2500 eV) were measured with a RFA analyzer equipped with an additional collector (acceptance angle 4). Additionally, the angular distribut…
<div class="htmlview paragraph">High purity die cast magnesium clutch housings and 4WD transfer cases have demonstrated their ability to function in corrosive road salt environments without the use of protective coatings. The weight reduction opportunities offered by magnesium also extend to highly visible compo…
An austenitic stainless steel (AISI 304) pipe weldment, which had been in operation about 45,000 h at 230°C in the Ringhals 1 BWR plant, was characterized using electrochemical sensitization testing methods (electrochemical potentiokinetic reactivation [EPR] and double-loop EPR), as well as transmission electron micro…
The temperature and angular dependences of the EPR spectra of Mg[H2O]6SiF6:Mn2+ crystal were investigated in order to clarify the successive phase transitions and existence of the incommensurate phase. Five successive phase transitions were found to occur, and phase II was found to be incommensurately modulated. The m…
Lattice parameters for SiC-15R and phonon frequencies for SiC-15R and SiC-6H were investigated as function of pressure by X-ray single crystal analysis and first-order Raman scattering. Linear and bulk moduli and phonon Gruneisen parameters were obtained. Phonon dispersion curves plotted in the standard large zone rev…
Examines the effects of directional variations in woven fabric properties on the behaviour of fabrics as they are plied and sewn together to form a seam. This is an important practical consideration, since garment manufacturing frequently involves the sewing of two fabric plies of completely different and constantly c…
A series of tests is conducted to study the mechanical release behavior of sodium aerosols containing nonvolatile fission products during a sodium-concrete reaction in which release behavior due to hydrodynamic breakup of the hydrogen bubble is predominant at the sodium pool surface.In the tests, nonradioactive materi…
Ongoing reductions in dielectric thickness for metallized AC capacitors, has resulted in a shift away from pure aluminium coatings for capacitor materials to be used in higher voltage applications. Metallized electrodes such as zinc with silver prenucleation, zinc/aluminium composites and aluminium bilayers are now re…
Abstract Runaway behaviour of an exothermic reaction in a semibatch reactor was studied experimentally on the example of hydrolysis of acetic anhydride catalyzed by sulphuric acid, in a 700 cm 3 thinwalled stainless steel stirred reactor, 10.2 cm in diameter and 13.0 cm high. The reactor was partially immersed, to a d…
The chemistry of pre-calcination and reduction roast processes with H2 + H2O gaseous mixture was analyzed, in order to find the best nickel and cobalt recoveries after selective roasting of nickelferrous laterites A thermodynamic analysis of the pre-reduction of garnieritic ores aiming NiO and CoO reduction showed tha…
The critical part of the transition metal joint between type 304 stainless steel and 2.25Cr-1Mo steel, with an immediate piece of Alloy 800, is the Alloy 800/2.25Cr-1Mo steel joint welded with Inconel 182. The performance of this trimetallic transition joint was studied by accelerated thermal cycling of the Alloy 800/…