Materials Literature
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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…
Diaminobutane poly(propyleneimine) dendrimers of second to fifth generations were functionalized by the introduction of pyridyl moieties at their primary amino groups through their interaction with 3‐pyridyl isothiocyanate. These pyridylated diaminobutane poly (propyleneimine) dendrimers were subsequently mixed with 3…
A new positive-working polyimide having photosensitive o-nitrobenzyl ester group as side substituent, poly{1,4-phenyleneoxy-1,4-phenylene-3,6-di[4-(o-nitrobenzyloxy)carbonylphenyl]pyromellitimide} (ODA-PI-Nb), was prepared and its aqueous alkali-developability and photosensitivity were investigated. ODA-PI-Nb was synt…
Two widely different rubbers, viz. EPDM and s-SBR have been selected in the present study. The influence of the basicity, the crystal structure and the ability to form complexes of various metal oxides were studied. It was observed that neither CdO, PbO, BaO, CaO, MgO and BeO are proper substitutes for ZnO as activato…
The addition of particulate fillers (woodflour) and short fibers (sisal) into an unsaturated polyester matrix was performed and analyzed. The efficiency of the filler treatment was carefully investigated, in particular, esterification with two different anhydrides, maleic anhydride (MAN) and an alkenyl succinic anhydr…
Novel chloro-subphthalocyaninatoboron()(Subpc) derivatives with six thioether at the 2 and 3 positions of peripheral benzene (Subpc(SR)) such as chloro-[2,3,9,10,16,17-hexakis-ethylthio-subphthalocyaninato]boron()(Subpc(SEt)) and chloro-[2,3,9,10,16,17-hexakis-benzylthio-subphthalocyaninato]boron()(Subpc(SBz)) were sy…
Eu3+ doped Lu2SiO5 (LSO) has been prepared by sol-gel chemistry. X-Ray diffraction showed that only the monoclinic phase corresponding to LSO is observed, even for doped samples. X-Ray absorption measurements were performed at both Lu and Eu LIII edges to investigate the substitution of Eu3+ for Lu3+ in LSO. Lutetium…
The equation T x sigmaDC(T) = alpha x exp[--(E*/kappa(B)T)--gamma x exp(E*/kappa(B)T)] has been used to understand the non-Arrhenius behaviour of the DC conductivity in supercooled glass-forming melts. Here, alpha, gamma and E* are parameters, E* denoting the activation energy for an elementary displacive step. Unlike…
Ferrocene-bridged bisporphyrins have been synthesized by the condensation of corresponding dipyrromethane-derived diols with a bisdipyrromethane. Purification of the final compounds has been achieved without chromatography. The specific geometry of these bisporphyrins makes them valuable starting points for building c…
We demonstrate a novel method for fabricating glass microlens (arrays) with single step on conventional lens surface. In this method, the glass microlens can be achieved by only one step with sol gel glass material. The microlens aperture and focus length can be controlled easily and uniformly. The fabricated sample s…