Materials Literature
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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…
The phases of cerium above 5GPa have been studied using angle-dispersive powder diffraction techniques. With filings of Ce, a C-face-centred monoclinic structure with four atoms per unit cell is obtained between 5 and 12GPa. Heating to 373K for many hours yields the known α-U phase. With a single cut piece as a sample…
It is well known that the Cupro®, Polynosic and organic solvent span rayons, such as Tencel®, and Lyoce® fibers are easy to fibrillate. The Rayon fiber is difficult to fibrillate. We developed fibrillation-resistant Cupro(CUPRO2) by means of a new spinning method. In this study, we attempted to compare the solid struc…
To meet the practical application, a kind of commercially available Si3N4 powder by direct Si nitridation was used to fabricate dense Si3N4/SiC nanocomposite by pressureless sintering method. The price of this kind of powder is much lower than that of powder by imide decomposition. 5-30 vol% of SiC powder (average par…
In this paper, different shapes of the boundary surfaces within the power transformers are reviewed. The surface charge distribution function on the two surface elements, which have the majority of usage, are recognized and the resultant potential and electric field intensity equations are derived. A numerical interpo…
A submicroscopic surface roughness as well as the atomic scale roughness are required for the observations of the strong SERS signal. The submicroscopic roughness is necessary to occur the electromagnetic enhancement of Raman scattered light, whereas the atomic scale roughness, i.e. the existence of the 'active sites'…
The current trend in Solid Oxide Fuel Cell (SOFC) development is for a lowering of the operation temperature from ~ 1000°C to temperatures as low as 600°C. This lowering of temperature is beneficial in a number of ways. It relaxes the stringent materials requirements for cell components, particularly, the interconnect…
Reactive ion etching (RIE), a well established technology in semiconductor industries, has proven to be also a versatile tool for the fabrication of optical components. Using fluor based processes, we fabricated refractive spherical and cylindrical microlenses as well as various diffractive optical elements (DOEs) e.g…