Materials Literature
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Abstract Durch Austauschreaktion (Na 2 O mit Li 8 TbO 6 ; Na : Tb = 2,1 : 1; Au‐Rohr; 750°C, 30 d) gelang erstmals die Darstellung von Na 2 TbO 3 in Form gelborangefarbener Einkristalle. Na 2 TbO 3 kristallisiert monoklin in C2/c (Z = 8; a = 576,92(6), b = 1001,27(9), c = 1117,91(14) pm, β = 99,98(1)°). Es liegt der L…
Spalling phenomena of the backup rolls used for hot strip mills and their prevention are discussed. The spalling on the surfaces of backup rolls is classified into two categories: excess rolling contact fatigue resulting from the local wear in roll barrel and propagation of the surface cracks generated by thermal shoc…
Analytical chemistry is one of the chemical areas where ultrasonic radiation has been only infrequently used (namely in sample pretreatment, separations, automatic analytical systems and clinical analysis). This auxiliary technique would constitute a powerful aid in the automation of several steps in analytical proces…
The mechanism of disintegrants in encapsulated mixtures was investigated by measurements of liquid uptake and swelling. An apparatus was designed to accomodate the capsule plugs and an LVDT was used to measure expansion of the compacts upon liquid uptake. AcDiSol, Primojel, Polyplasdone-XL 10 and corn starch, represen…
Abstract We discuss the interaction of ns 2 ‐type cations in ternary halides of the formula type A 4 BX 6 (A: In, Tl; B: Cd, Pb, Ge; X: Cl, Br, I) crystallizing in a Tl 4 HgBr 6 ‐type arrangement. We report on high pressure experiments on such A 4 BX 6 compounds and on x‐ray studies and structure refinements of mixed…
Pure barium titanate ceramics was subjected to partial discharge and dielectric breakdown test. Local field enhancement at the pores lowered the partial discharge inception field and breakdown strength. After applying 50% of the breakdown voltage, microcracks were formed by the shear stress set up at blocked ferroelec…
Corrosion inhibition studies of 304 stainless steel in phosphoric acid–chloride solutions with chromium, molybdenum, nitrogen, tungsten, and boron anions have been undertaken. The effect of dichromate, molybdate, tungstate, borate, nitrite, and nitrate ions on the behaviour of the alloy has been studied using potentio…
It is shown that, if mechanical twinning and deformation faulting on the {112}〈111〉 orientation of the rolling texture component are prevented or nullified, such as by cross rolling, the resulting deformation texture is essentially the same for both high‐SFE (stacking‐fault energy) and low‐SFE metals. These observatio…
Le systeme a pour composition (% poids) 75 SiO 2 -1 Al 2 O 3 -11,2 Na 2 O-3,5 MgO-0,13 K 2 O-9 CaO. Trois solutions aqueuses sont utilisees (eau deionisee, NaCl 5M, solutions riches en Si) a 2 temperatures (100 et 200°C). On etudie les phenomenes d'echange d'ion et de diffusion dans la solution
Linear free energy relations have been used to calculate rate coefficients for the stages in the polycondensation reaction of the potassium salt of 4-fluoro-4′-hydroxybenzophenone and for the polycondensation reactions of 4,4′-difluorobenzophenone with the dipotassium salt of 4,4′-dihydroxybenzophenone and the dipotas…
Using drug concentration remaining at a given time as the criterion, a 24x3 factorial design has been employed to investigate the effects of temperature, light, media (aqueous or organic/aqueous), ionic strength and pH on the stability of doxorubicin hydrochloride. Following the application of first order kinetics, an…
Hydrolysis of [Mo(NBut)(CH2But)2(CHBut)], which leads to the trimetallic title compound, is shown to occur stepwise via four identificable oxo-bridged dimetallic intermediates.
Abstract When ferrites are used for electromagnetic wave absorbers in the VHF and UHF bands we note their excellent properties such as their wider dynamic frequency bandwidth and their thinner thickness than that of lossy dielectric absorbers, which are due to their magnetic losses. However, there exists an upper freq…
Adhesive hard-sphere colloidal dispersions. III. Stickiness in n-dodecane and benzene.- The structure of colloidal suspensions under shear flow: Light scattering experiments.- Kinetic and spectroscopic properties of small colloids of metal iodide semiconductors.- Charge carrier dynamics in colloidal semiconductors.- C…
Facteurs agissant sur le fluage: degre de cristallinite, epaisseur lamellaire, temperature, vitesse de contrainte
The effect of shed configuration on the contamination performance of post insulators for HVDC converter stations is reported. Field measurements of contamination severity are used to define the contaminant levels utilized in artificial contamination tests made with the clean fog method. Test results for naturally cont…
The permanganate oxidation of L-leucine in aqueous phosphate buffers over the pH range 6.1 – 7.6 is autocatalyzed by the manganese reduction product, a soluble form of colloidal manganese dioxide. The kinetic data for both the non-catalytic and autocatalytic reaction pathways have been obtained, and mechanism in agree…
Dimethylindium(III) complexes have been isolated from aqueous methanol on reaction of dimethylindium(III) nitrate with the neutral nitrogen donor ligands 1,10-phenanthroline, 2,2′-bipyridyl, and 4,4′ disubstituted 2,2′-bipyridyls, bis(pyridin-2-yl)methane [(py)2CH2], bis(N-methylimidazol-2-yl)methanol, 2,2′:6′,2″-terp…
The structure of Na5[Cu{TeO4(OH)2}2]·16H2O has been determined by X-ray structure analysis. It crystallises in the triclinic space group P with a= 5.922(4), b= 8.939(2), c= 12.528(2)Å, α= 98.45(1), β= 99.11(3), γ= 93.82(4)°, and Z= 1. The structure was refined to R= 0.040 for 2 131 observed reflections [F > 3σ(F)]. Th…
A detailed model structure of dodecagonal quasicrystals is proposed which applies to both dodecagonal Ni-Cr and V-Ni or V-Si-Ni. This model structure can be represented as the restriction of a 5d periodic structure to a 3d subspace, which is identified with physical space. The point group and the space group of the 5d…