Materials Literature
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Detailed statistical data of stress- and electromigration-induced void formation and growth in passivated Al-lines have been evaluated from in-situ TEM experiments for the first time. Experimental parameters such as grain size (0.5 μm to more than 3 μm, i.e. nearly perfect bamboo structure in the lines), relaxation ti…
Karl Weierstrass (1815-1897) belongs to the outstanding mathematicians who have worked in Berlin. After 13 years as a Gymnasium teacher at remote locations in Prussia far away from the centers of mathematical research, Weierstrass came to Berlin in 1856 at the age of 41 (as professor extraordinarius; he was promoted t…
Ukra na (Otrimano 25 berezn 1996, v ostatoqnomu vigl d | 18 kv tn 1997
The complete reaction of humulene 9,10-epoxide {(2E, 6E)-9,10-epoxy-3,7,11,11-tetramethylcycloundeca-2,6-die, (1)) with m-CPBA produced a hitherto unknown ZR*, 3R*, a*, 7S8, 9S*, 10S
PbX2-PbO-SiO2 (X=Cl, Br and I) glasses were prepared and their electrical properties were investigated. The sole carrier for these glasses is the X- ion, which was estimated from the EMF (electromotive force) of the X2 gas concentration cell and the electrical properties. The ionic conductivity was enhanced with a dec…
Alumina-based ceramic composites prepared by particulate dispersion using SiC and Y2O3 as additives were studied under hot-pressing at 1400 to 1600°C for 0 to 20h. An yttrium aluminum garnet (YAG, Y3Al5O12) phase was formed by the reaction between Al2O3 and Y2O3 above at 1400°C after 10min of hot-pressing, and dense A…
As trials costs continue to rise it becomes increasingly attractive to design and assess fragmenting warheads using a combined approach of numerical analysis and prototype test firings. This paper describes an integrated methodology where three dimensional Computer Aided Design (CAD) data can be used to create prototy…
Low-molecular liquid crystals containing silicon were synthesized. Concerning the purpose of the silicon tow aspects are of interest. Firstly, short siloxane segments are terminally attached to the mesogens which have a rod- like shape or a wedge-like one. This allows us to study the effect of opposite forces, especia…
An experimental study was carried out to determine the standard Gibbs energy of formation of zinc orthosilicate, Δ (Zn2SiO4), for the purpose of controlling zinc vapor pressure by utilizing the equilibrium reaction between Zn2SiO4 and a CO-CO2 gas mixture. A CO-CO2 gas mixture of fixed composition was passed through a…
Longitude effect in the mid-latitude F region is studied in this paper, using monthly median value f<SUB>0</SUB>F<SUB>2</SUB> and f<SUB>0</SUB>F<SUB>1</SUB> observed at Changchun and Urumqi,China from 1956 t…
The composites of alumina matrix and stainless steel rope were fabricated by hot pressing at 1573K. Most of the interfaces between alumina matrix and stainless rope were good contact, but a part of the interfaces had cracks probably because of thermal stress during cooling after the hot press treatment. The composites…
The electronic spectrum of [(η-C7H7)Mo0(CO)3]+ shows its longest-wavelength absorption at λmax = 379 nm which is assigned to a Mo0→η-C7H7+ MLCT transition; the 3MLCT excited state is luminescent at room temperature; solid [(η-C7H7)Mo0(CO)3]PF6 as well as solutions of the complex in MeCN display this emission at λmaxca…
The potassium (K) status of 22 soil samples from 12 pedons originating in 6 Pacific Island countries has been investigated by several techniques. The total K contents of the soils studied were found to be low to very low. Use of various methods available for measuring exchangeable cations in soils showed exchangeable…
Aluminium titanate (tialite, Al 2 TiO 5 ) is a refractory material of low thermal expansion coefficient. However, single crystals have strongly anisotropic linear expansion coefficients along their principal axes. Tialite can be readily synthesised on heating a mixture of conventional corundum and rutile powders, star…
The ferroelectric phase transition in fine particles of lead titanate (PbTiO3; PT) was studied by Raman scattering and X-ray diffraction for various particle sizes.
Perovskite oxides of La1-xNaxTiO3 (x=0. 05, 0. 1-0. 5) were synthesized under high-pressure and -temperature. XRD analysis showed that sample is cubic for x=0. 05 and pseudo-cubic for 0. 1≤x≤0. 5. Cell volumes of samples with 0. 1≤x≤0. 5 decrease as x increase, and the cell volume for x=0. 05 is less than that for x=0…
AbstractThe corrosion inhibiting effects of three additives, sodium benzoate, calcium gluconate, and sodium glycerophosphate, as coinhibitors with Na2WO4 were investigated by measuring the corrosion weight loss of mild steel in distilled water and in 10−3M NaCl. The specimens were examined and photographed under a met…
Historically, bearing steels have been manufactured using “clean steel technology” to produce a product that has reduced levels of non-metallic inclusions. Included in this review are the key steel production practices that have evolved over time to make steels with superior cleanliness. The evolution of steelmaking p…
Glauconite and Ca phosphate peloids occur in Jurassic and Cretaceous bioclastic carbonate rocks from pelagic swell sequences of the Algayat-Crevillente Unit (Subbetic Zone).The size and morphology of the peloids are controlled by the bioclasts.The glauconite in both stratigraphic positions is K rich (>0.69 atoms p.f.u…
Endemic Asterionella taxa from Lake Tsimbazaza, Madagascar, were studied from type material with light and scanning electron microscopy and shown to possess short raphe branches; rimoportulae may be present or absent.These taxa appear to be closely related to Actinella species also endemic to Lake Tsimbazaza, by virtu…