Materials Literature
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The nanofiller, 1,3,5,7,9,11,14-hepta-2,2,4-trimethylpentyl-tricyclo[7.3.3.1(5,11)] heptasiloxane-endo-3,7,14-triol, T-POSS, was recently demonstrated to increase modulus retention in poly(ethylene terephthalate) fibers. In this paper, changes in the structure of T-POSS were studied as a function of time, temperature,…
In this study, the ternary Mg-Al-Ca phase diagram was constructed by combining the three constituent binary systems of Mg-Al, Al-Ca and Mg-Ca. The Mg-Al system is taken from COST 507 database. The thermodynamic descriptions of the Mg-Ca and Al-Ca systems are obtained by modelling the Gibbs energy of all phases as a fu…
The electrochemical synthesis of polymelatonin was studied on bare electrodes and the poly(3,4-ethylenedioxythiophene) (PEDOT) modified electrodes from the aqueous acidic solution through the cyclic voltammetry method. It was found that electropolymerization was very much dependent on the experimental conditions such…
This study aims at the testing of various low-k insulators deposited at temperatures below approximately 160 °C for possible application in temperature-limited copper interconnects (e.g., in plastic electronics). Various polymers were tested such as the well-known poly(methyl methacrylate) (PMMA), a polyhedral oligome…
Silicon carbide (SiC) matrix composites reinforced by SiC fibers is a candidate structural material of fusion gas-cooled blanket system. From the viewpoint of material designs, it is important to investigate the swelling by irradiation, which results from the accumulation of displacement damages. In the fusion environ…
The synthesis and properties of two non-planar and highly rigid pentamers containing four phthalocyanine units linked, via a spirocyclic fused ring system, to a central phthalocyanine or porphyrin core is described. It is shown that the rigidity of these novel oligomers, together with the large number of structural is…
A fast and stable approach for the simulation of transformer nonlinearities during transient and unbalanced operating conditions is given. The proposed scheme implements separate magnetic and electric equivalent circuits. The solution of the transformer nonlinear mathematical model is carried out using the Newton–Raph…
The addition of the water-soluble carbon nanomaterials, fullerenol (C 60 (OH) n ), hydroxylated single walled carbon nanotubes (HO-SWNTs) and isophthalic acid functionalized-SWNTs (IPA-SWNTs), alter the morphology and crystal phase of CaCO 3 precipitates form aqueous solution. CaCO 3 precipitation in the presence of C…
The quasicrystalline structure found in the isothermally aged microstructure in an Al–10Mg–0.5Ag (mass%) alloy after solution treated, water quenched and then aged during the time between 20 and 40 min at 240°C has been characterised using transmission electron microscopy, electron microdiffraction and energy dispersi…
We have developed new powder magnetic core, which was named HDMC (High Density Magnetic Composite), with high density, high magnetic flux density and high strength. However, the HDMC, which was fabricated from iron particles coated with phosphate glass insulator, has large eddy current loss under high frequency becaus…
Mixtures of 30% Bi2O3 and 70% GeO2 (in molar percents) were prepared followed by the solid state reaction at 700 °C for 30 min. or 24 h using an Al2O3 crucible. After melting at 1050 °C for 10 min. the melt was poured into a preheated graphite plate and then naturally cooled to room temperature (RT). X-ray diffraction…
New troponoid liquid crystals with bis(tropon-2-yl)-4,4’-azobisbenzoate core were prepared. Compound (1) had enantiotropic nematic and/or smectic C phase. The crystals of 1a had intermolecular π-π interactions between azobenzene planes and between tropone rings. The nematic liquid crystal (1a) did not form any layer s…
An ultrathin multilayer film consisting of polyoxometalate cluster α - K 8 [ P 2 W 17 O 61 Ni II ( H 2 O ) ] ∙ 18 H 2 O ( P 2 W 17 Ni ) and polyallyl amine hydrochloride (PAH) was fabricated on quartz and indium tin oxide substrates by layer-by-layer self-assembly. The multilayer films, ( P 2 W 17 Ni ∕ PAH ) n , were…
A series of composite films of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) modified with polyvinylpyrrolidone (PVP) was prepared by varying the ratio of constituents, and their properties and cytocompatibility were evaluated. The hydrophilicity of the blended materials surfaces increased and the amounts of…
Abstract Titanium alloys are forged into a variety of shapes and types of forgings, with a broad range of final part forging design criteria based on the intended end-product application. This article begins with a discussion on the classes of titanium alloys, their forgeability, and factors affecting forgeability. It…
In this paper a rapid overview of the main results obtained from the study with multi-frequency HF-EPR of molecular spin clusters possessing integer spin values is presented. In the first part, two antiferromagnetic rings with zero ground spin state are reported. It is illustrated how the HF-EPR study of the first exc…
Applications requiring the containment and transport of hydrogen gas at pressures greater than 70 MPa are anticipated in the evolving hydrogen economy infrastructure. Since hydrogen is known to alter the mechanical properties of materials, data are needed to guide the selection of materials for structural components.…
SF6 gas has excellent dielectric strength and interruption performance. For these reasons, it has been widely used for gas insulated switchgear (GIS). However, use of SF6 gas has become regulated under agreements set at the 1997 COP3. Presently, development of a gas circuit breaker (GCB) using CO2 gas and development…
This paper describes the features and benefits of ultra high frequency (UHF) partial discharge monitoring (PDM) systems for gas-insulated switchgear (GIS). The main features of two high-performance PDM systems are described in detail including explanations of the data displays, and the interpretation of partial discha…
Over the past few years, the air cooling technology improvements present diminishing returns for microprocessors cooling applications. Presently most of the proposed future cooling technologies (i.e. pumped liquid cooling or vapor compressor refrigeration) may need some fluid moving device and a large remote heat exch…