Materials Literature
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The influence of cobalt and nickel on the formation of irradiation-induced defects was studied in fluoride, phosphate, silicate and borosilicate glasses. Sample plates of high-purity glasses, undoped and doped with 0.3 mol% CoO and NiO, respectively, were irradiated with UV lamps and with X-rays. The subsequent defect…
Based on the test results carried out on 160kN porcelain and glass AC insulators, a DC insulator and a 35kV composite insulator in the artificial climate chamber, this paper puts forward the flashover performance of the tested insulators in coexisting condition of high altitude, contamination and icing, and analyzes t…
In the present study, such mechanical properties of hydrogenated zirconium as sound velocities, elastic moduli, hardness and stress-strain curve have been evaluated by ultrasonic pulse-echo method, Vickers hardness test, tensile test and resonance method using cantilever beam specimens, and the influence of the hydrog…
Abstract A requirement for the determination of the solubility of minerals is to ensure that equilibrium has been reached. Recent constant composition dissolution studies of sparingly soluble calcium phosphates have revealed an interesting and unusual behavior in that the rates decreased, eventually resulting in effec…
The architecture of 2-D [Mn(H2O)3][W(CN)6bpy]·4.5H2O is controlled by CN-bridging of [W(CN)6bpy]2− to [Mn(H2O)3]2+, face-to-face π-stacking interactions within pairs of [W(CN)6bpy]2− and an extensive network of hydrogen bonds; it provides the first example of a cyano-bridged bimetallic supramolecular assembly of 4.82…
The goal of this work is to overcome the loss of bonding strength experienced by kraft fibres when they are dried and reslurried. Paper strength was compared in the presence or absence of chemical pretreatments of the refined, never-dried pulp. Polyelectrolytes of relatively high molecular mass had the greatest benefi…
The photochromic properties of thienyl- and thieno[3,2-b]thiophenyl-substituted cyclobutene-1,2-diones were examined.
In the present study, a 10% ethanolic extract of Caralluma arabica, at the doses of 200 and 400 mg/kg, was evaluated for the antigastric ulcer activity using experimental gastric ulcer models induced by phenylbutazone or indomethacin and 80% ethanol or 0.2N NaOH, and cold restraint stress. Some experiments were carrie…
Material design has recently become one of the key topics in the development of smart adaptive composites. In particular, different material constituents of the hybrid polymer composites with embedded Shape Memory Alloy elements (SMA composites) have to be combined and positioned in such a way that predetermined funct…
A new series of dendrimers containing a central cavitand core with four appended Fréchet-type dendrons, linked to the core through 4,4'-bipyridinium (viologen) subunits, have been synthesized, characterized and their electrochemical properties investigated using cyclic voltammetric measurements.
A sharp luminescence peak from Sm doped ZnS at 650 nm which can be assigned as 4G5/2–6H9/2 transition of Sm3+ ion was observed; however, no luminescence peak related to Eu3+, which can have luminescence in the similar spectral region, was observed from Eu doped ZnS. A defect level situated at about 0.36 eV above the v…
In order to investigate the effect of deuteration on the ferroelectric properties of glycine phosphite, single crystals with various deuteration ratio x (0 ∼ 0.78) have been prepared. The crystal form is not affected by the deuteration. Internal bias fields influenced hysteresis loops in all samples cut from crystals.…
We report on the observation of precursor effects of the rhombohedral-to-cubic phase transition in Indium Selenide (InSe) with several experimental techniques. The pressure at which these precursor defects are first observed depends on the sensitivity of the experimental technique. In transport measurements, which are…
A new technique by XAFS (X-ray Absorption Fine Structures) and XANES (X-ray Absorption Near Edge Structures) has been developed for in situ observation of metal corrosion. XAFS and XANES spectra were obtained with a special electrochemical cell to elucidate pitting for stainless steel. A sheet of stainless steel was a…
The free-base and titanyl (Ti(IV)O) complexes of meso-tetratolyl- and meso-tetra(3,5-xylyl)hydroporphyrins were synthesized and characterized. Metalation of the hydroporphyrins with titanium was achieved by reaction of the lithium salts of the hydroporphyrin with TiCl(4). Other methods used to metalate porphyrins with…
The surface treatment of glass beads, chosen as model filler, is carried out using four kinds of silane coupling agents with multilayer coverage. For this purpose, the silanes having aminopropyl or methacryloxypropyl group as an organofunctional group with two or three alkoxy group numbers are used. The amount of sila…
The practical application of the glycolysis mixture of polyurethane wastes is reported. It was found that in the presence of 4,4′-diphenylmethane diisocyanate (MDI) both the separated upper phase of the glycolysis mixture and the complete two-phase reaction mixture could be used as components of the urethane adhesive…
2-Methacryloyloxyethyl phosphorylcholine (MPC)-bonded chitosan was prepared by Michael addition of MPC to the amino groups of chitosan. The modified surfaces were characterized by static contact angle and electron spectroscopy for chemical analysis (ESCA). The water contact angle of chitosan decreased with the MPC bon…
Passive-to-active oxidation transitions in chemical vapor deposited (CVD) SiC under low total pressures (0.8-440 Pa) in the temperature range 1250-1700°C have been investigated. A mass spectrometer sampling system equipped with a xenon image furnace was used to detect the transition points. As the temperature increase…
Nominally pure BaF 2 single crystals were investigated at 77 v K with optical absorption and electron paramagnetic resonance to understand the mechanism of radiation damage. We find that X-irradiation at 77 v K of undoped BaF 2 produces V k - and F -centres having absorption bands at 3.4 and 2.3 v eV respectively.