Materials Literature
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The surfaces of polymers, namely polypropylene, copolymers and blends, were exposed to low pressure oxygen and atmospheric pressure air plasmas to improve their adhesion to polyurethane adhesives. A correlation is attempted between lap shear strengths of polypropylene-polyurethane composites and the relevant XPS, AFM…
Dynamic tensile tests and instrumented impact tests with Charpy-V-notch specimens and precracked Charpy specimens (SENB) are performed and simulated. Two strain-rate dependent micromechanical models based on the modified Gurson flow function are compared by simulating different dynamically loaded specimens. One purpos…
A direct torque control system for a variable speed induction motor drive consists of two hysteresis comparators, a selection table, a flux and torque estimator, and a PID speed controller. With this control structure, the drive performance can be significantly improved when compared to field oriented control. In the…
The effect of thermal treatment on the behavior of the transition of an Fe-50.5 at%Rh alloy between the anti-ferromagnetic and ferromagnetic phase was carefully investigated with electric resistivity measurements and transmission electron microscopy (TEM).The specimens were annealed near 1000 K after solution treatmen…
High-strength ceramic molds with heat resistance and oxidation resistance have been fabricated, and they are now applied to practical parts such as turbo rotors, bearings and machining tools. However, their fracture toughness and thermal shock resistance are poor and their reliability is also low. In order to improve…
Atmospheric refiner mechanical pulping of untreated, fungal and alkali treated jute bast has been explored in the present investigation. Hammermilled and cut jute bast strands were refined in a laboratory single disc refiner under atmospheric conditions. First stage refining was carried out to about 500 ml. CSF and se…
Abstract Chiral symmetry breaking can be realized in stirred crystallization of Na‐ClO 3 . We present experimental and theoretical studies of the random distribution of crystal enantiomeric excess (cee) for various stirring and solvent evaporation rates. For a fixed solvent evaporation rate, as the stirring RPM is inc…
The reactions of pyrrole and thiophene monomers in copper-exchanged mordenite have been investigated using EPR and UV–VIS absorption spectroscopy. The EPR spectra show a decrease in the intensity of the Cu2+ signal and the appearance of a radical signal due to the formation of oxidatively coupled oligomeric and/or pol…
β‐SiC powder containing 6 wt% A1 2 O 3 and 4 wt% Y 2 O 3 as sintering additives was pressureless sintered at 2000°C for 1 h (AYE‐SiC) and 3 h (AYP‐SiC). AYE‐SiC consisted of an equiaxed grain structure and AYP‐SiC exhibited a micro‐structure with platelike grains as a result of grain growth related to β→α phase transf…
A desire for improvement of the state of the art in cotton quality measurements, and for application of such measurements to the ginning process, has prompted investigation of near-infrared reflectance (NIR) as a means of measuring different cotton quality characteristics. Cotton samples from five different cotton sou…
The luminescence emission from the complexes between EuIII and tetracyclines was found to be greatly enhanced by surfactants. Under optimum conditions, viz., pH 8.0 and 1.0% m/v cetylpyridinium chloride or Triton X-100 surfactant, an enhancement by a factor of up to approximately 34 was observed for some tetracyclines…
A rigorous theory of the difference frequency mixing of two signals, one with frequency ω and the other with frequency near 2ω, in semiconductors is presented. It is shown that a lower-frequency (DC ~ 10THz) directional photocurrent and voltage are generated as a result of this nonlinear interaction. This result concl…
Illumination of solutions of spiroquinoxazine 1 yields both a coloured species and a fluorescent species, both of which are reverse photochromic and both of which are trapped by bivalent metal ion complexation.
It is recognized that the non-dispersive components, γab, of the surface free energies, γ, play an important role in the interactions of a polymer with other substrates. Because of the difficulty in measuring the surface free energy of a solid polymer surface, many methods to estimate γ have been developed. The purpos…
Core plasmas of laser-imploded ICF targets were observed by using a 10-ps temporally resolved two-dimensional x-ray imaging technique. A multi-imaging x-ray pinhole camera was coupled to an x-ray streak camera, and two-dimensional images were reconstructed by handling the streaked image data. Image distortion of the s…
Description Features the latest trends in fracture mechanics research from the world's leading scientists and engineers in the field. This edition presents 45 peer-reviewed papers, including nearly a third from foreign contributors, divided into six comprehensive sections: Fracture Mechanics of Ceramics -- Six papers…
Description Compiles the latest information in fracture mechanics research from the world's leading scientists and engineers in the field. In addition to an extensive overview of applied fracture mechanics as it pertains to pressure vessels safety, STP 1256 features 42 peer-reviewed papers that cover: Constraint Crack…
The double flash technique of F. K. Dolezalek and W. E. Spear (1975, J. Phys. Chem. Solids, 36, 819) for the measurement of recombination coefficients was used to determine the recombination mechanism of drifting electrons and holes in stabilized a-Se (Cl-doped a-Se: 0.3% As). The experiments show that the recombinati…
We present a detailed study of the interaction of nitric oxide (NO) with the reconstructed (5 × 1) and metastable (1 × 1) surfaces of Ir{100} using vibrational spectroscopy and low-energy electron diffraction (LEED). Despite certain similarities with the corresponding Pt system, for example in the adsorbate-induced li…
Two series of polypropylenes with different molar mass—reactor grade (RE) and peroxide-degraded (CR) types—were investigated with respect to mechanical and crystallization parameters. A significant influence of the production process on mechanical parameters was found, which can be attributed to differences in the cry…