Materials Literature
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The paper presents a methodology for successful localization of degraded insulation in medium voltage cables. Extensive work has been performed on development of cable models and characterization of new and degraded cable material to support the diagnostic technique. A non-destructive technique has been developed usin…
We focused on half-Heusler compounds MPtSn, where M is Hf, Zr and Ti, to seek for half-Heusler compounds which intrinsically show excellent p-type thermoelectric properties in a wide temperature range up to around 1000 K. Nearly single-phase MPtSn alloys were fabricated by directional solidification using optical floa…
X-band electron paramagnetic resonance (EPR) spectra of gamma-irradiated crystals of carbonatebearing fluorapatite from the Levant mine, Cornwall, England, revealed the presence of two previously characterized centers (i.e., an O − defect and an O − ⃞ F defect, where ⃞ F represents a vacancy at the F site), a CO 2 − r…
A pulsed wire discharge method was used in the synthesis of zirconia–alumina nanocomposite powders by mixing zirconium plasma with aluminum plasma and cooling them together in an oxygen atmosphere. The products formed were characterized by powder X-ray diffractometry, transmission electron microscopy, and Brunauer–Emm…
Utilities that fail to conduct emergency training may find themselves relying on untested paper emergency plans when they face an actual crisis.
Cr-doped BiFeO3 (BFO) thin films were deposited on Pt(200)/TiO2/SiO2/Si(100) substrates by a chemical solution deposition method. The dielectric constant and dissipation factor of the BFO thin films decrease from 165 and 0.054 (undoped) to 100 and 0.02 (3 mol% Cr-doped) at a frequency of 10 kHz as the Cr content incre…
Control technology is being applied in different industries including textiles. The use of open loop control in dying machines and closed loop control in the let-off motion mechanism of looms are conventional. In this study, a weft yarn tension controller was implemented in a single nozzle air-jet loom for controlling…
A three-dimensional model for the generation of split dislocations by grain boundaries in nanocrystalline A1 is proposed. In terms of this model, rectangular glide split-dislocation half-loops nucleate at glide lattice dislocation loops pressed to grain boundaries by an applied stress. The level of the applied stress…
A model describing the main stochastic properties of partial discharges (PDs) under alternating-current (ac) voltage is proposed. PDs corresponding to microdischarges in small voids randomly distributed in a solid insulator are considered. The PD initiation is simulated using a stochastic criterion. The decay of plasm…
Reactive stresses in Cu-Al-Ni shape-memory single crystals are experimentally determined on constrained samples heated at a constant rate in the temperature range 293–800 K. At temperatures up to 600 K, the stresses increase with temperature. At higher temperatures, they begin to decrease as a result of the decomposit…
The principal scientific and technological barriers to the fabrication of ultra-high temperature ceramics (in particular borides and carbides of zirconium and hafnium) are investigated. Generally these ceramics exhibit d ifficult sinterability, poor toughness and low thermal stab ility at high temperatures under oxidi…
The structure of carbon nanotube (CNT) is a promising building block for future nanocomposite structures. Mechanical properties of the electrospun butadiene elastomer reinforced with CNT were analyzed by the multiscale method. The dependence of nanofiber diameter on electric field and solution concentration is estimat…
Magnetic and chemical bonding effects in Heusler alloys ${\mathrm{Ni}}_{2}\mathrm{Mn}\mathrm{In}$, ${\mathrm{Ni}}_{2}\mathrm{Mn}\mathrm{Sn}$, and ${\mathrm{Ni}}_{2}\mathrm{Mn}\mathrm{Sb}$ were studied by soft x-ray spectroscopy. Exchange splitting detected in Mn $2p$ core-level x-ray photoelectron spectra and an incre…
Abstract Summary: The perfluorinated copolymer poly(tetrafluoroethylene‐ co ‐hexafluoropropylene) (FEP) was electron beam irradiated under vacuum at various temperatures ranging from room temperature to a temperature above the melting temperature of FEP. Changes of the chemical structure were analyzed by 19 F solid‐st…
A density functional study was carried out to investigate the C-H···O hydrogen bonding effects on the 17 O electric field gradient and chemical shielding tensors in crystalline 1-methyluracil. Since the structural coordinates were obtained from a neutron diffraction study, no geometry optimization was needed in perfor…
Abstract A systematic investigation of cadmium‐doped manganites with compositional formula La 0.67 (Sr 0.33– y Cd y ) MnO 3 ( y = 0–0.33) has been undertaken mainly to understand their structural as well as their electrical transport behavior. The materials were prepared by the citrate‐gel route and were characterized…
The dielectric losses in copper doped derivatives of layered Na1.7K0.3Ti3O7 ceramic are the cooperative contribution of electric conduction, dipole orientation, and space charge polarization. Moreover, copper doping decreases dielectric loss due to inhibition of domain wall motion. The room temperature electron parama…
The nonlinear refractive index of some pure and dye-doped nematic liquid crystals was measured and compared using extraordinary polarized light. The optical torque of the nematic liquid crystals was strongly enhanced by a small amount of dye impurities (Sudan Black B). This observation is found to be in good agreement…
The dielectric properties of electroclinic and ferroelectric liquid crystal materials have been investigated in the frequency range of 100Hz–10MHz. A dielectric mode has been predicted in electroclinic liquid crystals near the transition temperature of Sm-C*–Sm-A phase. It has been observed that the investigated mater…
Organoclay was compounded with ethylene-propylene-diene-monomer (EPDM) using a two roll mill and cured by conventional sulfur curing system. The organoclay content was progressively increased from 0 to 10 parts per hundred of rubber (phr) of the EPDM rubber. Cure characteristics were carried out on an Ekktron moving d…