Materials Literature
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This paper presents design and test of a single-phase HTS transformer with capacity of 45 kVA operated in liquid nitrogen of 77 K for primary/secondary voltages of 2400/160 V. The windings were wound by stainless steel-enforced multifilamentary Bi2223/Ag tapes. The structures of primary and secondary windings are sole…
Degradation of oil painted copper surfaces involves chemical, physical and mechanical processes that are influenced by the prevailing environment. The oil paint/copper interface formed between the lower layers of paint and its copper support determines the stability of the system. Components within the painted copper…
This paper reports the electrical transport properties of the interface of a multiwalled carbon nanotube (MWNT) in physical end contact with a hydrogen-passivated Si surface and a Pt surface. The electrical measurement was performed in an atomic force microscope (AFM) with a MWNT attached to a scanning probe in contac…
We investigate how miscellaneous parameters influence the velocity of the disclination line in a bistable chiral splay nematic liquid crystal (BCSN LC) device, using a model derived from the relationship of the free energy loss rate with dissipation energy. The disclination velocity is consistently coupled with the fr…
Abstract Application of the ESI‐ mass spectrometry technique for the structural studies of biopoliesters is reported. The structural studies were performed on two selected commercially available biopolyesters i.e. poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV) and poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyhexanoate)…
A vinyl copolymer carrying crown ether and spirobenzopyran side chains, which undergoes significant photoinduced rheology changes, i.e., contraction and extension of its polymer chain, was applied to a material for photocontrol system of solvent permeation rate, so-called, photochemical valve. Macroporous polyethylene…
We measured the orientational order parameter of $F$-actin traversing the isotropic-nematic phase transition using a combination of techniques, including fluorescence imaging, local birefringence measurements, and small-angle x-ray scattering. The order parameter approaches a saturated value of 0.75 for actin concentr…
Biodegradable copolyesters were prepared by copolymerization of ϵ‐caprolactone (ϵCL) with a cyclic polyester consisting of isosorbide and suberic acid (CPIS). Four initiators were compared: Sn(II)2‐ethylhexanoate (SnOct2) in combination with benzyl alcohol, 2,2‐dimethyl‐2‐stanna‐1,3‐dioxepane (DSDOP) lanthanium and yt…
During operation, an outdoor high voltage insulator may come under various stresses. One of them is environmental pollution, where pollutants stick to the insulator surface. The polluted condition may produce leakage currents or even electrical discharges. Their waveforms are normally non-pure sinusoidal. To understan…
This paper presents novel methods to produce arrays of lipid bilayers and liposomes on patterned polyelectrolyte multilayers. We created the arrays by exposing patterns of poly(dimethyldiallylammonium chloride) (PDAC), polyethylene glycol (m-dPEG) acid, and poly(allylamine hydrochloride) (PAH) on polyelectrolyte multi…
The reaction of mixtures of aluminum isopropoxide and gallium acetylacetonate in 1,4‐butanediol or 1,5‐pentanediol at high temperatures (glycothermal reaction) directly gave the γ‐Ga 2 O 3 –Al 2 O 3 solid solutions, which had high catalytic activities for selective reduction of NO using methane as the reducing agent.…
We examine the evolution of the refractive index modulation when recording gratings in an acrylamide based photopolymer. A nonlocal diffusion model is used to predict theoretically the grating evolution. The model has been developed to account for both nonlocal spatial and temporal effects in the medium, which can be…
This work describes the devulcanization of vulcanized SBR (Styrene Butadiene Rubber) based on controlled oxidation with nitric acid. IR, ¹H and 13C-NMR, CHN elemental analyses, TG, GPC and TPD-MS (Temperature Programmed Decomposition-Mass Spectrometry) experiments suggest that nitric acid promotes two processes: (i) d…
Extremely high strength in microcomposite Cu-Nb wires is associated with ultra-fine-scale microstructure. The extended interfaces between ribbon-like niobium filaments and copper matrix contain the areas of semi-coherent interfaces that are apparently the main reason of significant level of residual stresses observed…
Abstract Low alloyed zirconium sheets (Zr702) have been cold-rolled up to 80% thickness reduction and submitted to various isothermal treatments. The aim was to identify the mechanisms which produce microstructure and texture changes during recrystallization and grain growth. XRD and texture analysis, FEG–SEM with EBS…
Polycrystalline hexagonal Yttrium Manganites (YMnO 3 ) were prepared by solid-state route. X-ray studies revealed the formation of homogenous and single phase material in hexagonal structure. Dielectric, impedance, electrical, magnetic and magnetoelectric measurements were performed on the YMnO 3 ceramics. Dielectric…
The (Bi1/9Na2/3)(Mn1/3Nb2/3)O3 ceramics with perovskite structure were sintered. The XRD test proved that the samples are cubic (a = 3.920 ± 0.001 Å). Microstructure and atomic composition were determined with a SEM (JSM-5410) equipped with energy dispersion X-ray analyser (ISIS-300). The fluctuation in the chemical c…
Zinc oxide nanocrystalline sheets were self-assembled on a flexible polymer substrate to act as the electrode of dye-sensitized solar cells by an in situ-construction electrodeposition process. It was discovered that the nanosheet-based solar cell exhibited better performance than a nanoparticle-based solar cell or a…
Recycling of high-volume polyolefin-based packaging wastes in India is challenging, as they have low recycle value, high levels of contamination, and lack of direct processing methods. This work discusses a two-stage mechanical processing method for recycling the polyolefin-based plastic wastes that are not convention…
This research investigated the effects of processing conditions on the shrinkage and warpage (SW) behaviour of a box shaped, polypropylene part using conventional and microcellular injection moulding. Two sets of 26–1 fractional factorial design of experiments (DOE) were employed to perform the experiments and proper…