Materials Literature
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Temperature dependences of longitudinal and transverse dielectric permeability of KDP and DKDP crystals are studied at different values of hydrostatic pressure in order to determine the pressure behaviour of the isotropic point for these crystals. The isotropic point temperature in KDP crystals at atmospheric pressure…
The corrosion inhibition of a green scale inhibitor, polyepoxysuccinic acid (PESA) was studied based on dynamic tests. It is found that when PESA is used alone, it had good corrosion inhibition. So, PESA should be included in the category of corrosion inhibitors. It is not only a kind of green scale inhibitor, but als…
The influence of various rare-earth contents on the friction and wear characteristics of magnesium alloy AZ91D was studied. The results show that the wear resistance properties of rare-earth magnesium alloys are better than those of the matrix alloy under the testing conditions. Magnesium alloys undergo transition fro…
A review is cited with 17 references. The radical mechanism of polyurethane degradation such as hydrolysis, thermolysis, oxidation and photolysis were introduced.
Compact spinning is a novel concept generated through re-engineering of established ring spinning process by attaching a pneumatic zone to existing ring spinning machine. Compact spinning achieves a remarkable improvement in yarn quality and yarn structure through better utilization of fibre properties. The advantageo…
ODA (Optically Dark Area) in the vicinity of inclusions at fracture origin has a crucial importance in the mechanism of ultralong life fatigue failure. From the authors' previous studies, it has been presumed that ODA is formed by the fatigue due to cyclic stress coupled with hydrogen which is trapped by the inclusion…
Glasses of composition M2O•2SiO2 (M = Li, Na, K, Rb and Cs) were obtained by means of molecular dynamics simulation. The structures of these glasses were analyzed with help of Q-species distribution. The influence of alkali oxide on a decay of Q-species is monitored according to the equation 2Q n ↔ Q n-1 + Q n+1 . Equ…
The Effect of Co-Doping by Ca2 + , Ta5 + , Sn4 + , and Ru4 + Ions on the X-Ray Luminescent Properties of Gd2 O 2 S : Tb3 + Phosphors , Morlotti, R., Magro, C., Vedda, A., Martini, M., Croci, S., Nikl, M.
A comparison between the conventional Bragg-Brentano diffractometer and the two-dimensional (2D) diffractometer is made in terms of diffraction geometry, diffraction pattern, and various applications. A two-dimensional XRD system for combinatorial screening in transmission mode is introduced. IINTRODUCTION A two-dimen…
We report electro-optical studies of polymer-stabilized ferroelectric liquid crystals (PSFLCs). PSFLCs are made by photopolymerizing 3% reactive mesogenic monomer using the quasi bookshelf texture of a FLC as a template. We observe the formation of nano-scaled polymer fibrils templated by the two dimensionally ordered…
The existing results on the relaxor-like dielectric behavior which is characterized by a broad maximum in a dielectric permittivity as a function of temperature and the low frequency dielectric dispersion are reviewed for different ferroelectric and non-ferroelectric materials. The general and distinctive features of…
A series of polyimide (PI)-silica hybrid nanocomposites are prepared from 3,3′,4,4′biphenyltetracarboxylic dianhydride (BPDA)-4,4′-oxydianiline (ODA) polyamic acid (PAA) and tetraethoxysilane(TEOS) or tetramethoxysilane (TMOS) by the sol-gel process. 3-Aminopropyltriethoxysilane (3-APS) is used to enhance the interfac…
Based on microscopic considerations, an analytic statistical model is presented for the study of the temporal variation of up-conversion luminescence produced by the interaction of excited state Ln3+ optical centers in monodoped amorphous materials. The resulting expressions are presented in terms of known mathematica…
SrTiO3 and ZnO bicrystals with various types of boundaries were fabricated in order to examine their current—voltage characteristics across single grain boundaries. Their grain boundary structures were also investigated by high-resolution transmission electron microscopy. In Nb-doped SrTiO3, electron transport behavio…
Ti–Cr–V alloys are known to absorb protium (hydrogen atom) up to H/M = 2, while Cr-rich alloys absorb up to H/M = 1 because of the formation of mono-protides (mono-hydrides). However, few hydrogen isotope effects of the Ti–Cr–V alloys have been reported. This paper aims to clarify the hydrogen isotope effects on the a…
We observed ligand-sensitized and up-conversion photoluminescence (PL) in vacuum-deposited thin films of an infrared electroluminescent organic erbium complex, erbium (III) tris(8-hydroxyquinoline) (ErQ). The PL intensity at 1.55 µm was increased by three orders of magnitude by changing the photo-excited species from…
Electropolymerization of indole (IN) in the presence of thiophene (Th) was followed by in situ and ex situ spectroelectrochemical studies. A correlation between absorbance (390 nm) and charge (at 600 mV) values indicated that oligomeric species were formed in solution, and similar results were found with in situ measu…
Silk films were treated with O2 and NH3 plasmas for the improvement of dyeability. After O2 and NH3 plasma treatment of silk films, chemical composition of O and N on the surface increased, respectively. Also the concentration of acid and base functional groups increased. The silk films were insolubilized so that they…
Optical spectra of tetrahedrally coordinated Ni2+ ions in ZnO were studied as a function of temperature in the range from 94 to 673 K. Integral intensities of the spin-allowed 3T1(3F) → 3T1(3P)dd transitions on Ni2+ were found to be independent of temperature, indicating temperature independent oscillator strengths an…
The effect of the introduction of the 1,4-piperidine and 1,4-piperazine fragments into the molecular structure of liquid crystals on the appearance of the mesophases and their physico-chemical properties is discussed and compared with that of other well-known molecular fragments.