Materials Literature
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A model describing the excitation of UHF signals by current pulses in a waveguide is developed using dyadic Green's functions. This model relates to UHF signals used for the detection of partial discharge (PD) caused by defects in gas-insulated substations (GIS). Application of the theory is demonstrated by compa…
The structure of disodium bis[μ-oxo-tri-μ3-oxopentakis(μ-propionato-κO:κO′) tris(propionato-κO)-0.5-chromium-0.5-irontrimolybdenum](3 Mo-Mo), Na2[Cr0.5Fe0.5Mo3O4(C3H5O2)8]2, consists of a centrosymmetric cluster anion, [(EtCO2)8Mo3O4CrFeO4Mo3(O2CEt)8]2−, in which two Mo3O4 units are joined by the Fe and Cr atoms to co…
In order to understand the effects of density fluctuations in composite systems, we have studied the effects of compression rate on the final density and density variations in a system of hard spheres. Systems of 900 and 1800 mono-sized spheres are placed in a box with periodic boundary conditions in the x and y direc…
Packing polymorphism and conformational disorder of poly(hexamethylene terephthalate) were analyzed by x-ray diffraction technique. The measurements were performed in the temperature range from 20 to 135°C. At high temperature, several unassignable reflections were found to disappear, and all reflections were satisfac…
The basic deformation properties of pseudoelasticity and shape memory effect due to martensitic transformation and R-phase transformation were investigated experi-mentally for TiNi shape memory alloy (SMA) wire subjected to various maximum strains. The properties of transformation temperature were discussed based on d…
Polymeric carboxylic acids such as poly(acrylic acid) and copoly(acrylic—maleic acid)s are widely used as cobuilders in detergent powder formulations. They were introduced in the early 1980s in combination with zeolites as partial replacements for polyphosphates, which were removed from detergent formulations because…
Electromigration-induced void growth in Al metallization was investigated by comparing it with the electrical resistance change and the thermographically measured change in temperature distribution. Constant current flowing through two different-width interconnects in series consistently induced void growth at their j…
Poly(vinylamine) is of interest because of its pH-dependent cationic nature and its reactive primary amine functionality. The preparation of poly(vinylamines) of various molecular weights via the synthesis and hydrolysis of poly(N-ethenylformamide) (PNEF) is readily accomplished. Solution properties of poly(vinylamine…
Magnetic properties of amorphous carbon materials, prepared by pyrolysis of trialkylboranes, were examined using the superconducting quantum interference device and the electron spin resonance (ESR) methods. It is found that the observed magnetic properties could be greatly affected by pyrolysis temperature and the an…
The reaction of 2-methylene-1,3-dioxolanes and 2-methylene-1,3-oxazolidines with benzoyl peroxide (acceptor radical) and with N-ethylmaleimide (acceptor) was investigated. It was shown that benzoyl peroxide adds to monomers 1a and 1b, giving the corresponding linear diester amides 1a and 1b respectively. The oxazolidi…
The transport of fluids in the semicrystalline polymer, poly(aryl ether ether ketone) (PEEK), was investigated. Both solubility and rate of penetration of toluene into PEEK are markedly increased by the application of an external stress. The induction period (i.e., the time for the sorption to begin) is a function of…
Colloidal suspensions of InP quantum dots (diameters 25 and 35 Å) show steplike absorption spectra which are blue-shifted by about 1 eV with respect to bulk material. Time resolved femtosecond spectroscopy at room temperature identifies the first quantum confined state. The nonlinear bleaching signal rises within 300…
We investigate the properties of II–VI short period superlattice (SPSL) blue light-emitting diodes grown by molecular beam epitaxy. The device consists of a ZnSe active layer, SPSL MgZnSSe cladding layers, and a ZnSeTe digital graded contact. The SPSL structure is made of alternating layers of MgSe, ZnSe, ZnS, and ZnS…
We present results of a solution to longitudinal impact of thick bars, obtained via an exact three-dimensional theory. Detailed investigation of the behavior of the solution has been carried out, including a number of subsidiary calculations. The results obtained made it possible to improve on the knowledge of the phy…
The influence of thermal fluctuations on adsorption isotherms is calculated within the context of a self-consistent mean-field theory, and it is found that such fluctuations cannot be neglected in the analysis of adsorption data. This result arises from our observation that substrate-induced hindrance of thermal fluct…
A mean-field description is presented for the nematic and hexagonal ordering of intrinsically polydisperse semiflexible wormlike micelles interacting via a hard core volume exclusion potential. The predicted phase diagram is determined by two parameters, controlling the intrinsic rigidity of the micelles and their siz…
In this study, nonswellable and swellable poly(ethylene glycol dimethacrylate/acrylic acid) copolymer microspheres, in the size range of 50–150 μm, were produced by conventional and modified suspension copolymerizations of the respective monomers, i.e., ethyleneglycol dimethacrylate (EGDMA) and acrylic acid (AA) in aq…
Atomistic calculations are performed to study defect energetics in ZnGeP2 where two- and three-body interatomic potentials are used to simulate the perfect lattice. Formation energies for native ionic defects and binding energies for some of the electronic defect complexes are calculated. The dominance of antisite def…
Tensile tests with loading and unloading under various strain rates ε^^· were performed for TiNi shape memory alloy wires at various constant temperatures. The influence of strain rate on the stress-strain-temperature relationship was investigated. The main results are summarized as follows. ( 1 ) For ε^^· < 10%/min,…
Experimental Barkhausen data are presented for XC10 French steel at various stress levels. The experimental data show an apparent almost linear correlation with stress of WH (hysteresis loss) and WBN (Barkhausen noise amplitude integrated over H). A model previously suggested by Sablik for Barkhausen noise stress and…