Materials Literature
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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/…
Intergranular stress corrosion cracking (IGSCC) of metallic alloys including iron is strongly influenced by the presence of grain boundary impurities such as phosphorus. In this study to determine how phosphorus affects the corrosion of iron, electrochemical polarization methods were used in conjunction with surface a…
The effects of regional hyperthermia (42 degrees C for 70 min) on the antitumor activity of melphalan were examined in athymic mice bearing melphalan-resistant human rhabdomyosarcoma (TE-671 MR) xenografts growing in the right hind limb, and results were compared with similar studies of melphalan-sensitive (TE-671) pa…
Reaction of the platinum(II) complex of the pendent-arm macrocycle 6,13-diammonio-6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane with chlorine in aqueous solution does not lead simply to oxidation of the platinum(II) complex to a trans-dichloroplatinum(IV) complex. Instead, complete chlorination of the pendent primar…
<div class="htmlview paragraph">Ammonia is one of the most useful compounds that react with NOx selectively on a catalyst, such as V<sub>2</sub>O<sub>5</sub>-TiO<sub>2</sub>, under oxygen containing exhaust gas. However ammonia cannot be stored because of its toxicity for the…
Abstract The resonance Raman and far‐infrared spectra of n ‐Bu 4 NI 3 show the coexistence of symmetrical ( C 2ν ) and unsymmetrical ( C s ) I 3 − species, which are clearly distinguished by varying the wavelength of the excitation line. Only a slight deviation from D ∞ h symmetry has been deduced for the Br 3 − ions…
K 2 Se 5 has been prepared by crystallization from a potassium polyselenide solution in DMF. In a similar way [Na(15-crown-5)] 2 Se 5 can be prepared by crystallization from a sodium polyselenide solution in DMF in the presence of 15-crown-5. Both compounds were characterized by FIR spectroscopy as well as by X-ray st…
The distribution of polarization in ferroelectric ceramic samples of Ca-modified lead titanate, for different Ca contents, has been determined from the measurement, as a function of frequency and for different poling fields, of pyroelectric currents, generated by sinusoidal thermal waves of low frequency. Inferred fro…
A new in situ wall conditioning method by reactive gas fuelling has been investigated in TEXTOR; this method is applicable during plasma discharges of the operating machine. For these experiments, trimethylboron, B(CH 3 ) 3 , was fed into the torus instead of hydrogen. While the hydrogen of the trimethylboron molecule…