Materials Literature
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The influence of grain size on the deformation behaviour of a-zirconium in the temperature range 77° – 443°K has been investigated. The flow stress variation with grain size follows the Hall-Petch equation σ = σi + K d−1/2. Work hardening was found to increase with decrease in grain size; also for any grain size and s…
Abstract Durch Festkörperreaktionen von TeO 2 mit MnO, CoO bzw. NiO unter N 2 wurden folgende Verbindungen erhalten und durch Röntgen‐Pulverdaten charakterisiert: MTe 6 O 13 (M = Mn, Co), MTe 2 O 5 und M 2 Te 3 O 8 (M = Mn, Ni), MnTeO 3 und M 4 Te 3 O 10 (M = Mn, Co), Mn 2 Te 3 O 8 und Ni 2 Te 3 O 8 kristallisieren mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntiferromagnetic interactions in diamminecopper(II) carbonateDavid Y. Jeter, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1972, 11, 1, 185–187Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissue 1 Januar…
ABSTRACT: Volcanic ash soils were studied with the scanning electron microscope to observe the morphology and occurrence of aUophane, imogolite and halloysite. Allophane and imogolite in general were randomly distributed indicating aprocess of dissolution and recrystallization. Halloysite is typically associated with…
Abstract Possibly algal, Bacinella young stage of Lithocodium
T H E e l e c t r o c h e m i c a l d e t e r m i n a t i o n of the d i f fus iv i ty of oxygen in so l id m e t a l s us ing a s t a b i l i z e d z i r c o n i a s o l i d e l e c t r o l y t e ce l l of c y l i n d r i c a l g e o m e t r y was f i r s t c a r r i e d out by R i c k e r t and S te ine r I who d e…
Magnetic properties of a series of antiferromagnetic binuclear complexes correlate closely with their structures, as determined by single crystal, X-ray diffraction analyses.
Abstract The melting of solids under shear conditions is an important operation in the processing of most thermoplastics. In this study, solid blocks of high density polyethylene were melted on a hot, moving surface over a range of surface temperatures and velocities. The conservation equations for mass, momentum, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of alkali metal hexafluorophosphatesThomas C. Ehlert and Ming-Ming HsiaCite this: J. Chem. Eng. Data 1972, 17, 1, 18–21Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissue 1 January 1972https://pubs.acs…
Dimethyl Δ3-1,2-diazetine-1,2-dicarboxylate has been prepared by photolysis of the 1 : 1 adduct of 2,5-dimethyl-3,4-diphenylcylopenta-2,4-dienone and 2,3-dimethoxycarbonyl-2,3-diazabicyclo[2,2,0]hex-5-ene; this new ring system formally satisfies the Hückel (4n+ 2) rule, but no pronounced stability was observed, and th…
Abstract
Di g it a l me th ods of hi g h prec is ion ha ve bee n de ve loped for th e c alculation of e lec tri c fi e lds a nd tra jectori es in e lec tros tati c le nses a lld a comput e r prog ra m was wri tt e n to app ly th ese me t hods to th e two-tube le ns . Th e ill c reased prec is ion res uit s fro m til(" use of n…
It is shown that measurements of a.c. and d.c. conductivity in undoped amorphous As2S3 films differ in several respects from those reported in other chalcogenide glasses. Experiments show conclusively that the a.c. lows in this material are due to a bulk-controlled process. The frequency-dependent but temperature-inde…
In order to investigate the effect of grain size on Portevin-LeChatelier yielding, tensile tests were performed on Al–0.55 and 1 at% Mg alloys having various grain sizes. In a temperature range of −20°∼+40°C and a strain rate range of 3.3×10−5∼1.7×10−3/sec, the value of activation energy for the P–L effect was found t…
The 4-arylazo-1-naphthols (1) undergo self-sensitised or dye-sensitised photo-oxidation in solution, giving 1,4-naphthaquinone and the aryl-diazonium ion.
Alpha uranium dicarbide disks coated with pyrolytic carbon migrate, relative to the carbon, up a temperature gradient, leaving behind a layer of rejected graphite. A model for the migration process based on solution of carbon at the hot UC 2 ‐C interface, transport across the UC 2 phase by thermal diffusion, and rejec…
The dehydrobromination of 3-bromo-6,6-dimethylbicyclo[3,1,1]heptan-2-one has been studied. Treatment with lithium bromide and lithium carbonate in dimethyl sulphoxide gave 6,6-dimethylnorpin-3-en-2-one (apoverbenone) in good yield. From (–)-pin-2(10)-ene, optical purity 91%, we obtained (+)-apoverbenone, [α]D+ 319°(c…
Coproporphyrin-I has been synthesised by modifications of Fischer's original methods; Coproporphyrin-II has been synthesised by three methods including a variant of the MacDonald method, involving self-condensation of a 5-formylpyrromethane-5′-carboxylic acid. Coproporphyrins-III and -IV and a related porphyrin tricar…
Cultures of blue-green algae of 44 soil samples and 40 samples of naturally growing ones, collected from highly saline soils, moderately saline soils and reclaimed saline soils, were studied in relation to the soil type. It was found that most of the species belonging to Chroococcales, Oscillatoriaceae, Nostoc, Tolypo…
Using digital methods, electric fields and paraxial electron trajectories in the two-tube electrostatic lens have been calculated, and the first-order (Gaussian) focal properties accurate to at least 0.1% were obtained for voltage ratios from 1.5 to 50. The results are presented in the form of P-Q (object-image positi…