Materials Literature
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The polyester in the base fabrics (PET) and the polyvinyl chloride coating (PVC) along with plasticizers and adhesive/glue were separated from a commercial coated fabric by a scheme of chopping, grinding, and extracting with a selected preferred aqueous MEK solution. A novel recovering method called swelling method is…
Brazing experiments were performed at 830/spl deg/C for Al/sub 2/O/sub 3//Al/sub 2/O/sub 3/ and Al/sub 2/O/sub 3//Fe-Ni-Co alloy joints, which are used in electronic and structural applications. The brazing was done with Ag-Cu and Ag-Cu-Ti and changes in fracture mode and fracture strength of the Al/sub 2/O/sub 3/-Al/…
PMN-PT ceramics with perovskite structure were prepared by powders synthesized in KCl molten salt. Dielectric and piezoelectric properties were studied and compared with those of the ceramics prepared by conventional ceramic processing. The results indicate that the PMN-PT powders with perovskite structure can be synt…
FT-IR Spectroscopy have been used for identifying both the structure of BN and the intensity of the compressive stress in cubic boron nitride (c-BN) film prepared by a unbalanced of (13.56 MHz) magnetron sputtering of a hexagonal boron nitride target in a mixture argon and nitride discharge. A T(temperature) - V(negat…
Molecular modeling and thermal analysis have been integrated into our Polymer Science course in order to encourage multifaceted problem solving and allow students to systematically explore the role of chemical structure in determining the glass transition temperature of a polymer. A variety of case studies, such as th…
The influence of exchange coupling of layers on the propagation of magnetostatic dipole volume waves in normally and tangentially magnetized two-layer epitaxial ferrite structures is investigated. It is shown that the indicated influence is manifested in the form of dynamic spin pinning effects on the interlayer bound…
Abstract The 35 Cl NQR frequencies, spin-lattice relaxation time and 1 H NMR relaxation time were measured on crystalline Na 2 PtCl 6 • 6H 2 O at 77-350 K. The presence of three nonequivalent chlorine sites found by X-ray diffraction measurement is in agreement with the observed three NQR lines, which have different t…
Self-compensation is studied in bulk samples of PbSe: (Bi, Se ex ) prepared by a metal-ceramic method. The dependence of the carrier concentration on the amount of excess selenium is investigated for various bismuth concentrations. Comparison of the experimental data with calculated data shows that the donorlike activ…
We present a harmonic analysis of symmetric tilt boundaries in face-centred cubic Lennard-Jones systems with a view to finding their thermodynamic properties. These results are used to predict those which are likely candidates for interface melting at high temperature. A system is found in which the excess energy is m…
Stress corrosion cracking (SCC) crack initiation and crack growth rates (CGR) were measured in mill-annealed alloy 600 (UNS N06600) tubing as a function of the stress intensity factor (K) in 10% caustic at 315°C. Tests were conducted using internally pressurized smooth and precracked tubing. Samples were polarized to…
Austenitic stainless steel has been welded to coat pressure vessels in petrochemical plants. The material is highly susceptible to stress corrosion in chloride environments, which can damage the weld and lead to the rupture of the component. In this work we did the evaluation of the influence of welding parameters on…
A high temperature NTC resistivity transition (T c2) near 600°C has been found in donor modified barium titanate (BaTiO3). Thermal treatment around this temperature regime plus applied voltage (T c2-Poling) on previously developed PTCR materials significantly affects both electrical behavior and ferroelectric domain s…
The paper describes investigations concerning the damage of a tube reactor made of 2 Cr 1 Mo steel and its enhancement due to MoS2 deposits. The damaged tube sheets of the reactor were investigated and laboratory tests with the low alloy steel welded to a high alloy steel were conducted in order to clarify the corrosi…
Abstract 35 Cl Nuclear Quadrupole Resonance (NQR) has provided a valuable tool for investigating the local structure in mixed crystals K 2 S 1-x Re x Cl 6 and Al 3+ doped crystals K 2 SnCl 6 :Al 3+ . The measured NQR line shapes and relaxation times of both kinds of impurity containing crystals in the cubic phase of t…
A blue electroluminescence (EL) device was fabricated using SrSO 4 :Ce-based phosphor layers deposited by rf sputtering in Ar–H 2 S atmosphere. Peak emission wavelength was observed at 420 nm corresponding to the energy transition from the T 2g (5d) level to the F 5/2 (4f) level of Ce ions. This wavelength is shorter…
Diffraction characteristics of periodic binary diffractive structures are studied using three different theoretical approaches. Namely rigorous coupled-wave analysis (RCWA), Kogelnik's two-wave method, and the scalar method of transmittance have been applied to study diffraction characteristics and have been compared,…
Abstract The successive phase transitions of [Mg(H 2 O) 6 ][SiF 6 ] were studied by measuring 2 H NMR spectra. The quadrupole coupling constant e 2 Q q /h and asymmetry parameter η changed drastically at each transition temperature. 1,2 H and 19 F NMR T l were measured for this compound to study the relation between t…
The surface properties of TiO2 anatase are of great importance in chemical technology because this material is frequently used as a support for oxide catalysts. In the framework of an extensive study of the system V2O5/TiO2 anatase, the vibrational properties of single crystal anatase (001) and (100) have been examine…
The effect of the substituents, solvent polarities and hydrogen ion concentration on the electronic structure and UV/VIS absorption spectra of some Schiff bases, derivatives of N-(R-benzylidene)benzidine (R = o-NO2 and o-OH, p-OH) and N-(R-furfurylidene)benzidine (R = H and 5 - NO2), have been studied. The spectral sh…
Results of an in-situ extended X-ray absorption fine-structure study of photostructural changes in films of amorphous selenium are reported. It is shown that at first the average coordination number decreases by about 10%. As time elapses, the initial coordination number is restored. This change is attributed to break…