Materials Literature
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Cationic starch is extensively used in papermaking to increase paper strength and improve first pass retention. Starch, a high molar mass polymer of glucose, is commercially extracted from a number of plant sources including corn, wheat, potato and tapioca. In their natural state, starch polymers are generally uncharg…
The vitrification range and Raman spectra of binary KO1/2-SeO2 and NaO1/2-SeO2 systems were investigated. Addition of alkali oxide results in cleavage of Se-O-Se linkages in (SeO2)n chains. Glass structural fragments are discussed.
The major fibrillar collagen of rainbow trout skin, type I, was found to have a subunit composition of α1 (I) α2 (I) α3 (I); α3 (I) is known to be a unique subunit of bonyfish type I collagen. To investigate the primary structure of these α (I) chains, a cDNA library was prepared from mRNA of rainbow trout fibroblast…
Based on the experimental investigations a simple theoretical model for the simulation of partial discharge (PD) detection on high voltage XLPE-insulated cables has been developed. The model handles radial symmetric sensors. The dependence of sensitivity on geometrical characteristics of the sensor is investigated exp…
An efficient approach for calculating the short-circuit reactance of transformers is presented in this paper. This approach is based on the surface magnetic charge method and the band-ring mesh elements. The area integral in the calculation of the magnetic flux is transformed to a line integral, which can save on comp…
The inhibition of corrosion of copper in 2M HNO3 solution by some arylmethylene cyanothioacetamide derivatives was tested using polarization measurements. The results showed that these compounds act as mixed type inhibitors and inhibition efficiencies up to 90% can be obtained. The inhibition was assumed to occur via…
The mono-hydroxylation of a β-methylene carbon in the pyrroline ring of a chlorin requires only alumina and molecular oxygen as reagents, with good yields (70–80%) of the hydroxy chlorin obtained at room temperature in 2 h; this is the first example of a hydroxylated chlorin that has been prepared in a regiospecific m…
Austenitic stainless steel of the type AISI 316 was exposed to flowing sodium in a loop at 823 K for 57.6 Ms (16000 h). The specimens were examined for changes in microstructure, and tensile properties. A specimen was also subjected to thermal-ageing under identical conditions to facilitate comparison and resolve the…
The effect of additives on the kinetics of growth of calcium oxalate monohydrate crystals has been studied. Conductivity and potentiometry measurements have been compared. Growth rates were calculated from precipitate curves by a cubic spline method. An approach consisting on the calculation of rate constants and orde…
Methods for improving the magnetic properties of 3% non-oriented silicon steel were investigated. The thickness of samples was reduced to 0.1 mm by cold-rolling, and they were subsequently annealed in an argon gas atmosphere under various annealing conditions (annealing temperature, holding time, heating rate, and coo…
Surface flashover phenomena along polymeric rods partially immersed in liquid nitrogen were investigated between parallel electrodes and compared with those fully immersed in liquid nitrogen and those in gaseous nitrogen at cryogenic temperature. It was shown that ac flashover voltage along polymeric rods half immerse…
In retail-store settings, consumers are influenced by visual and tactile information while shopping for textiles and apparel products. In order to simulate some aspects of a real-world shopping context while recognizing the benefit of laboratory control and precision, textile chemists, physical scientists, social scie…
The cyclenphosphine selenide is prepared by reaction of molecular selenium on cyclenphos-phorane. Its physicochemical properties are compared to those of oxygen and sulfur analogues.
Abstract Blends of linear low‐density polyethylene (LLDPE) and linear low‐density polyethylene grafted maleic anhydride (LLDPE‐gMA) were prepared by melt mixing and then coextruded as external layers, with a central layer of polyamide (PA) on three‐layer coextruded flat films. Blends with contents of 0% to 55 wt% of m…
Ultrafine spherical particles of γ-Al2O3 containing 4 at% magnesium and pure γ-Al2O3 were prepared by evaporating metal Al in air. Consequently, both particles were heated at 1400°C for 6 h in a vacuum. TEM observations showed that the Mg-doped γ-Al2O3 particles were much more stable than the pure γ-Al2O3 particles. T…
Light-emitting porous silicon layers have successfully been obtained from hydrogenated amorphous silicon (a-Si:H), by anodic dissolution in hydrofluoric acid. The maximum thickness of the porous layers is limited by an instability due to the high resistivity of a-Si:H. The high luminescence efficiency is well accounte…
Magnesium alloys are well known to have high damping capacity. However, reports on damping characteristics of magnesium alloys, especially used practically, are very limited. In this study, the effects of alloy composition and heat treatment were investigated on the damping capacity of the hot-rolled and die-cast spec…
An original synthesis of substituted formyl selenophene heterocycles is described via selenoamide vinylogue from N-selenoacylamidines. The access of mono and bis-substituted 1,3-dithiol-2-ylidene selenophenes, potential π-conjugated precursors of selenafulvalene analogs, was achieved using Wittig olefination.
Irradiation effects of γ-rays on corrosion rates of type 304ULC stainless steel in 9×10−3 mol/m3 boiling nitric acid containing an ionic additive of multivalence elements of Ce(IV), Cr(VI) or Ru(III) were studied by measuring weight losses of specimens immersed under the 60Co γ-ray irradiation of 1 kC/(kg·h) (4MR/h).…
As steel cleanliness has been improved it has become ever more difficult to properly assess micro-inclusion contents and size distribution of harmful non-metallic inclusions in steel. The fact that inclusions do initiate fatigue failure is well known and easily proven in fatigue testing experiments. The problem addres…