Materials Literature
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This paper investigates a subject of high practical importance and proposes representative frequency range definition for HVAC testing with PD measurement which can improve both, on-site and laboratory testing. It will also strengthen the clear connection between stresses in service and HVAC testing. Furthermore it cr…
Nous avons affine la structure cristalline de la brandtite [Ca2(Mn,Mg)(As04)2(H 2 O)2, monoclinique, a 5.877(1), b 12.957(2), c 5.675(1) A, β 108.00(3)°, V 411.0 A 3 , groupe d'espace P2 1 /c, Z = 2], la collinsite [Ca2(Mg,Fe)(PO 4 ) 2 (H20)2, triclinique, a 5.729(1), b 6.778(1), c 5.444(1) A, a 97.31(3), β 108.63(3),…
We describe the first chlorine-free synthesis of nanozirconooligocarbosilanes through thermal cocondensation of low-molecular oligocarbosilanes and zirconium tetrakis(diethylamide). The starting reagents, reaction intermediates, and final products have been characterized by 1 H, 13 C, and 29 Si nuclear magnetic resona…
The influence of domain switching on the evolution of macroscopic polarization in the ferroelectric Pb(Mg1∕3Nb2∕3)1−xTixO3 material was studied. Domain switching during the application of a compressive stress was evaluated using in situ x-ray diffraction. It was found that stress depolarization was controlled by 90° d…
Ag-ceramic composite materials were investigated as low-cost internal electrodes for low firing piezoelectric multilayer ceramic actuators. Ag-ceramic pastes were prepared by adding PZT-based ceramic powders to a commercial Ag paste in the range of 0 to 50 wt %. PZT/Ag-PZT multilayered laminates were fabricated using…
Abstract Thermal behavior of poly(ethylene imine) [PEI] has been studied using simultaneous WAXD/DSC measurement system. PEI exhibits water‐induced and thermally‐induced phase transitions among four kinds of crystalline hydrates: anhydrate (EI/water = 1/0), hemihydrate (1/0.5), sesquihydrate (1/1.5), and dihydrate (1/…
The structure and properties of both natural and industrial glasses are influenced by the presence of small amounts of specific elements. Selected examples illustrate the roles of various elements in controlling properties such as coloration, stability, and optical and thermal properties, as well as the effect of redo…
A simple one port reflection method is proposed to measure the large signal permittivity and loss tangent of ferroelectric films. The microwave power levels are changed in the range from −10to17dBm at 0V dc bias. Microwave power causes two effects: (i) generation of higher order harmonics due to the dielectric nonline…
Based on the Ni-Cu system, catalysts were developed for low-and high-temperature industrial gas and waste gas purification. It was found that, regardless of the preparation procedure, the formation of a catalytically active structure occurred via the formation of a Ni-Cu solid solution at the stage of activation. The…
We have successfully fabricated high-contrast microcell liquid crystal displays (LCDs) using microstructure replication technology in thin plastic film substrates. These novel flexible LCDs comprise microcell replication, alignment treatments, and cell assembly. The cell gap of such flexible LCDs was maintained well b…
This paper presents a 3D electric-field calculation model of the plusmn800 kV DC transmission line composite insulators based on finite element method. With this 3D model, this paper introduces the effect of the tower, transmission lines and the parameters of the corona rings on the potential and e-field distribution…
We determined the positions of all atoms, including the light ones (D, H), in the crystal structure of synthetic ferricopiapite Fe{sub 14/3}(SO{sub 4}){sub 6}(OD,OH){sub 2}(D{sub 2}O,H{sub 2}O){sub 20}, using X-ray synchrotron [{lambda}0.64905(1) {angstrom}] and neutron ({lambda}2.0787 {angstrom}) powder diffraction.…
Absorbing mirrors are optical thin film systems consisting of an absorbing metal layer held by a transparent interlayer in defined distance to a (metal) mirror layer. In the reflected light, such three-layer systems show vivid color effects due to the absorption in the metal. This absorption is modified and enhanced b…
The fine structure of the complex low temperature dielectric relaxation process in biaxially stretched semicrystalline polyethylene terephthalate was investigated by the final thermally stimulated discharge current technique. By this technique, the apparent peaks that are mainly related to space charge detrapping from…
The predominant filler used in the commercial extrusion of natural fiber reinforced thermoplastic composites in North America is wood flour. Fibers such as wheat straw (Triticum aestivum L.) represent a promising filler alternative. In this investigation, untreated and fungal-treated wheat straw was employed as filler…
Carbon nitride films prepared by ion beam assisted deposition were studied by Raman and infrared spectroscopy, as a function of nitrogen ion energy (200, 400, and 600 eV) and the ion to atom arrival rate ratio R(I/A) ranging from 0.9 to 2.5. The composition ratio N/C in the film determined by elastic recoil detection…
The formation of ZrO 2 nanoparticles during the hydrothermal treatment of zirconium oxyhydroxide has been investigated depending on the chemical and thermal history of the initial material. It has been shown that the crystallization of c(t)-ZrO 2 and m-ZrO 2 under hydrothermal conditions proceeds virtually simultaneou…
Abstract Natural polymers and their derivatives are attracting increasing interest as promising biodegradable materials that can meet the environmental and recycling demands from society. This study prepared biodegradable composites of cellulose diacetate and starch, and examined their physical and thermal properties.…
In this paper an on-line time domain reflectometry system and a four-days measurements sequence are presented. Detected pulse velocity variations are attributed to temperature variations of the cable caused by a load cycling. The changes in the pulse velocity are verified by propagation constant measurements of a powe…
Nanoextrusions on single crystalline Al and Al‐Mg plates under constrained cyclic tension evolve from random arrangements to regular 2D surface rectangular grid (“tweed” – A) and through gradual evolution (B) to 3D porous rhombic grid of voids (“pullover” – C). The “tweed” spacing can be decreased by loading frequency…