Materials Literature
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Abstract Multilayer films of 2‐hydroxy‐4,4'‐dihexyloxy‐azobenzene (HAB) on silicon substrates have been studied with atomic force microscopy, temperature‐dependent FTIR, and X‐Ray diffraction technique. The results show that the multilayer films are formed by stacking of HAB monolayers via π‐π interactions and the adj…
Investigation of the spectrum of oscillations of a 180° domain wall (DW) freely moving in a uniaxial ferromagnet shows that the one-dimensional structure becomes unstable with respect to surface distortions in the region of negative effective mass (negative differential mobility). The upper critical value of the pertu…
Abstract Texture evolution was analyzed with the full-constraint Taylor model for an idealized perfectly plastic face-centered cubic material as well as for real, strain-hardening copper subjected to equal channel angular pressing (ECAP). For the idealized material, the stress in the plastically deformed part of the b…
Article A Study of Chemical and Physical Changes During Biaxially Oriented Polypropylene Film Production was published on November 1, 2003 in the journal Journal of Polymer Engineering (volume 23, issue 6).
Nowadays, along with requirements for developing heat-resistant electrical insulating materials, various kinds of high polymers with polar structures are used, which are characterized by high heat-stability, good electrical properties, hydrophilic nature, etc. While their heat-stability is beneficial to their uses, th…
Abstract The results presented are from a study on the production of highly dispersed silicas by their precipitation from solutions of sodium metasilicate and ammonium salts. The applied ammonium salts were NH 4 HCO 3 and (NH 4 ) 2 CO 3 . The precipitation process was conducted in the absence or presence of 1 wt.% non…
This paper summarizes what was discussed in a lecture at the IXth International Conference on Porphyrin Chemistry held in Suzdal (Russia) in September 2003. The development of porphyrin chemistry in former Soviet Union countries and over the world are discussed. Some ideas which were cultivated during three conditiona…
The spectral and kinetic parameters of the absorption and emission relaxation initiated by a single nanosecond-range electron pulse in MgF 2 crystals are studied in the temperature range 20–550 K. It is found that the relationship between the two channels of dissipation of the electronic excitation energy (generation…
Abstract The effect of enhanced hydrostatic pressure following heat treatment on the evolution of point defects in neutron‐irradiated Czochralski‐grown silicon is investigated using infrared spectroscopy. The behavior of oxygen‐related defects, particularly of the VO and the VO 2 centers, is mainly studied using sampl…
Abstract Electron transfer from photoexcited tetrasulfonated Zn(II)‐tetraphenylporphyrin (ZnTSTPP) to methyviologen (MV 2+ ) was studied. From the investigation of relative fluorescence intensity and emission lifetime against the MV 2+ concentration, it was concluded that the electron transfer takes place by a static…
The present study, on the optimisation of the scale-up of a Friedel−Crafts acylation, joins together experimental calorimetric techniques and simulation techniques. The adopted methodology involved the execution of isothermal tests at different temperatures, using the reaction calorimeter RC1, to obtain the heat flow…
Continuing a series of modeling studies of the influence of reshuffling of polymer segments on the polydispersity index (PDI), the additional effect of cyclization was analyzed by means of Monte Carlo simulations. It was shown that the contribution of cyclization in overall reshuffling process can be important only in…
A number of preharvest and postharvest factors alter textile quality, including cotton variety, growth environment, harvest method, lint cleaning, and combing. In this work, the impact of three planting dates in 1997 and 1999 on fiber properties, mote, neps, and white specks is monitored. Cotton is hand picked, ginned…
Abstract Ferromagnet/semiconductor DyN/GaN superlattice structures were grown on SiC substrate by radio frequency molecular beam epitaxy. Formation of DyN was confirmed by X‐ray diffraction measurements. The temperature dependence of the photoluminescence (PL) spectra for the DyN/GaN superlattice and GaDyN samples was…
Abstract With the reduction of critical dimensions (CD) of physical gate lines, standard methods for evaluating bottom CD from the scanning electron microscope (SEM) signal become inaccurate. The two peaks, originating from the line edges, merge into a single peak, and the correct position of the topographical top and…
Image analysis of the living, marine planktonic diatom, Neodenticula seminae (Simonsen et Kanaya) Akiba et Yanagisawa, collected during summers of 1996–99 off northeast Japan, the Kurile Islands and in the Bering Sea revealed significant intraspecific morphological variability. SEM observations showed the internal val…
The kinetics of crystallization limit the rate in which crystal growth can occur without in-corporation of undesired impurity. If the rate of heat transfer exceeds the mass transfer rate of the inpurity, the impurity can solidify, contaminating the product. One would like to specify a rate of crystallization and deter…
Thermodynamical, optical-texture and dielectric studies have been performed to study the phase diagram of the binary system of 5-cholesten-3β-ol-octanoate and 4-n-nonyloxybenzoic acid. It is observed that low concentrations of 5-cholesten-3β-ol-octanoate (2–30 mol %) in 4-n-nonyloxybenzoic acid induce a mean-field pha…
An AISI 430 (UNS S43000) stainless steel sheet was cold-rolled and then annealed at 1,073 K, to derive three different grain sizes. Through Devanathan hydrogen permeation tests at 303 K and a mathematical analysis for diffusion in laminate structures, the grain boundary diffusion coefficient (Dg = 1.14 × 10−15 cm2/s)…
The products from the reaction of octahydrosilsesquioxane (T 8 -H) with different molar ratios of phenol and undec-1-ene or methyl 3,3-dimethylpent-4-enoate (MDP) in the presence of chloroplatinic acid have been analysed by 29 Si NMR spectroscopy. The distribution of the two different pendant groups leads to tetrad pa…