Materials Literature
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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…
Biocompatible oil-in-water (o/w) micro-emulsions can be prospective drug delivery vehicles for their capability to solubilize lipophilic (oil soluble) drugs in the dispersed oil. Plant oils are considered suitable for such a purpose. In this study, we have attempted to examine the dispersion of corn, cottonseed, clove…
The styrene divinylbenzene copolymer (SDBC) supported platinum catalyst and the liquid phase catalytic exchange (LPCE) column have been developed to be applicable to the Wolsong tritium removal facility (WTRF) in Korea. The catalyst deactivation subject to both reversible uniform poisoning and permanent loss by impuri…
Removal of C 2 H 4 from a CO 2 stream is very important in ultrapurification of CO 2 for its application and utilization. However, it is difficult to remove C 2 H 4 completely from a CO 2 stream via conventional cryogenic distillation because the volatility of C 2 H 4 is similar to that of CO 2 . Another choice is the…
Electrochemical noise (EN) and electrochemical impedance spectroscopy (EIS) measurements were used to evaluate protective properties and corrosion behaviour of two different organic coating systems. The coatings of commercial grade (zinc rich ethyl silicate) were applied to steel substrates and immersed for up to 3 mo…
This paper provides a reluctance network modeling for the steady state performance calculation of a 94kW massive or a 125kW flux barrier rotor synchronous reluctance machine. The massive rotor is suitable for high-speed application; the flux barriers increase the saliency ratio and lead to higher torque and power fact…
Abstract A modular synthetic approach to preparing a family of triaminotriazine receptors bearing porphyrin chromophores is described. The porphyrin‐appended triaminotriazines are prepared in a stepwise manner employing either cyanuric chloride or fluoride and 5‐(4′‐aminophenyl)‐10,15,20‐triphenylporphyrin in the firs…
Mass spectrometric studies of the composition of the gaseous phase for solid compounds of hexadecafluorinated phthalocyanines MPcF 16 , M = Cu , Zn , VO and their unsubstituted MPc analogs were performed in a temperature range up to 600°C. It has been shown that phthalocyanines sublime into the form of monomers withou…
The search for new and better thermoelectric (TE) materials has recently brought to light a somewhat forgotten class of compounds, the clathrates of group 14. The rich phenomenology of these and related cage-like structures has driven the most recent research on their electronic, magnetic, spectral, and conducting pro…
We present predictions of a relatively simple model of the low-lying 0{sup +} states in {sup 12}Be, their predicted energy splitting in {sup 12}O, their cross-section ratios in {sup 10}Be(t,p) and {sup 14}C(p,t) and their decay widths. Comparison is made with predictions using earlier wave functions of Barker.