Materials Literature
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Polypropylene has been blended with ethylene-propylene-diene monomer (EPDM), low-density polyethylene (LDPE), and ethylene-vinyl acetate (EVA) copolymer and their combinations. The obtained films have been subjected to thermal and UV weathering. The relative change in the carbonyl index as a result of thermal and UV a…
Bulk and physica l properti es of need le-punched nonwoven fabri c depend on the nature of component fibre, the manner in whi ch the fibres arc arranged in the struc ture and the degree of co nsolidation . A proper understanding of th.:. role of differe nt parameters on fabr ic properties is important l'o r des igning…
A new method has been developed for determining the main laws of the deformation of soft soils under conditions of dynamic loading with amplitudes of up to several gigapascals. The method is based on the results of high-strain-rate tests under uniaxial deformation conditions, which were obtained using a modified Kolsk…
Qualification tests with respect to stress corrosion cracking and sulphide stress corrosion cracking of welded pipeline for oil and gas transmission are often based on four-point bend testing. However, there are no reliable standards or guidelines that account for the range of variables that may affect the results, in…
The eight weavable singles yarns studied in Part 1 of this paper were all woven plain weave and the end breaks identified by cause and recorded. End breaks were found to be due to failed splices, abrasion failure and thin places. The incidence of thin-place breaks was found to increase with increasing irregularity (CV…
We present a systematic study of porous silicon photoluminescence quenching in the presence of precisely controlled amounts of linear aliphatic alcohols (from methanol to hexanol) in gas and liquid phases. From the concentration dependence of photoluminescence quenching response we determined sensitivity of porous sil…
Abstract Since the introduction of the ZIRLO™ alloy for use in commercial nuclear light water reactors (LWRs) in the early nineties, work has continued on identifying chemistry and process changes to improve further the in-reactor corrosion performance of the alloy. Relative to the reference ZIRLO chemistry of Zr-1%Nb…
The infrared (IR) spectra of cuboidic titanium carbide (TiC) nanocrystals have been studied at the density-functional-theory (DFT) level using the Becke-Perdew (BP) functional and triple-zeta quality basis sets augmented by one set of polarization functions (TZVP). The accuracy of the calculations was checked by DFT c…
Water‐soluble chitin (half‐deacetylated chitin) was prepared from chitosan by N‐acetylation with acetic anhydride. Alginate/water‐soluble chitin blend fibers were prepared by spinning their mixture solution through a viscose‐type spinneret into a coagulating bath containing aqueous CaCl2 and ethanol. The structure and…
Abstract Surface‐enhanced Raman scattering (SERS) spectroscopy has been successfully extended to transition metal/non‐aqueous electrochemical interfaces recently in our laboratory. Some interesting and new findings are presented with the objective of illustrating the virtues of SERS as a versatile technique to examine…
NaNiO 2 was prepared through oxidation of a Na 2 NiO 2 / NiO mixture (1:1) in dried oxygen at 500 °C. Single crystals have been grown by annealing of NaNiO2 powder at 600 °C for 83 d in a flow of dried oxygen. According to the X-ray analysis of the crystal structure (C2/m, Z = 2, a = 5.3177(2), b = 2.8458(1), c = 5.58…
Abstract A band filter gradient structure was obtained in porous Si by electrochemically etching a rugate structure into a Si wafer using an asymmetrically placed counter electrode. The resulting porous Si film displays a rejection band whose wavelength maximum varies spatially due to the uneven distribution of curren…
Abstract The PROMETRA material testing program is a support program related to the study of high burnup fuel rod behavior under Reactivity Initiated Accidents (RIA) and to the interpretation of the CABRI REP-Na RIA test results. Hoop and axial tensile tests have been performed on fresh and irradiated Zircaloy-4 claddi…
In this paper, the epoxy elasticity factors were investigated by thermomechanical analysis (TMA), dynamic mechanical thermal analysis (DMTA), thermogravimetric analysis (TGA) and field emission scanning electron microscope (FESEM) to improve toughness and reduce brittleness of existing epoxy resin. Dumbbell shaped spe…
The present study investigated in detail the effect of texture evolution on the mechanical properties of an Al–5·7 wt-%Ni eutectic alloy, which was subjected to severe plastic deformation by the equal channel angular pressing (ECAP) technique. The ECAP procedure was carried out using two strain introduction methods, r…
We have performed an extensive study of the porosification of germanium by anodization in HF-based electrolytes. Both n- and p-doped Ge substrates (with varying doping levels) were used, as well as different electrolyte concentrations, anodization currents and times. We will review the conclusions we were able to draw…
Abstract The mechanism of Zircaloy shadow corrosion was studied theoretically and experimentally. The theoretical study showed shadow corrosion, with a few exceptions, to be remarkably consistent with a galvanic corrosion mechanism. The exceptions may be explained as radiation effects. An experiment was therefore devi…
We study the effect of a hydrodynamic flow on the orientational configuration of a nematic liquid crystal around a spherical particle imposing rigid normal anchoring. We discuss the cases of large Ericksen numbers (characterizing the ratio of viscous force to the elastic force), where strong elastic deformation by the…
Chromium-based treatments are currently used for the passivation of tinplate, which produces a protective surface layer consisting of a mixture of metal chromium and chromium oxide. This passivation film is effective against the formation of tin oxides and corrosion by food media, and offers a good substrate for the a…
Abstract Clay minerals of calcareous sedimentary rocks of southern Iran, part of the old Tethys area, were investigated in order to determine their origin and distribution, and to reconstruct the palaeoclimate of the area. Chemical analysis, X-ray diffraction, transmission electron microscopy, scanning electron micros…