Materials Literature
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The effects of the physical aging on the vibrational density of states (VDOS) of a polymeric glass is studied. The VDOS of a poly(methyl methacrylate) glass at low energy ( < 15 meV), was determined from inelastic neutron scattering at low temperature for two different physical thermodynamical states. One sample was a…
In situ time-resolved small-angle X-ray and neutron scattering have been used to investigate the mechanism of a bulk precipitation of a hexagonally ordered ZrO 2 /surfactant mesophase. Using hexadecyltrimethylammonium bromide (CTAB) as a structure-directing agent, the precipitation results from the addition of sulfate…
The synthesis and characterization of a new homologous series of compounds, the 2-cyano-1,3-phenylene bis[4-(4-n-alkoxyphenyliminomethyl)benzoates] derived from 2-cyanoresorcinol is reported. All the compounds are enantiotropic mesogens and exhibit the fascinating B7 mesophase. The characterization of the mesophase wa…
An advanced method of X‐ray diffractometry analysis, the quantitative texture analysis, is used in this work to study the preferential orientations of ferroelectric lanthanum‐modified lead titanate thin films, to establish the factors affecting their development. The new, more reliable, texture data obtained allows us…
Abstract The thermodynamic properties of MgZn2 and Mg2Zn11 were investigated by calorimetry. The standard entropies of formation at 298 K, ΔfSo298, were determined from measuring the heat capacities, Cp, from near absolute zero (2 K) to 390 K by the relaxation method. The standard enthalpies of formation at 298 K, ΔfH…
Abstract A series of polymerizations of 3,6‐dibromo‐9‐(2‐ethylhexyl)carbazole was carried out in different monomer concentrations using standard Yamamoto reaction conditions. It was found that the molecular weight of the resulting poly( N ‐(2‐ethylhexyl)carbazol‐3,6‐diyl) strongly depends on the monomer concentration…
Abstract Thermoplastic vulcanizates (TPVs) or dynamic vulcanizates are thermoplastic elastomers produced by simultaneous mixing and crosslinking of a rubber and a thermoplastic. The effects of different types of peroxides as curing agents on the properties of PP/EPDM TPVs were investigated at a fixed blend ratio. The…
An inorganic/organic composite hybrid nano-system has been successfully synthesized in which nanocrystalline quantum dots (QDs) were effectively immobilized within a photo-cross-linked poly(ethylene glycol) (PEG) hydrogel. The immobilization of 3.5−6.0 nm CdTe and 2.0−3.5 nm CdSe QDs within the PEG hydrogel network ha…
Analytical and numerical methods are used to solve Poisson's equation for carbon nanotube field-effect transistors (FETs) with a cylindrical surrounding gate and Schottky-barrier contacts to the source and drain. The effect on the nanotube potential profile of varying the work functions of all the electrodes, and the…
Abstract C 14 H 13 ClCuN 2 O 5 , monoclinic, P 12 1 / n 1 (No. 14), a = 9.559(2) Å, b = 11.024(2) Å, c = 14.397(4) Å, β = 104.75(2)°, V = 1467.1Å 3 , Z = 4, R gt (F) = 0.034, wR ref (F 2 ) = 0.089, T = 293 K.
The individual and joint effects of alloying with copper, silicon, and molybdenum as well as titanium and niobium on the electrochemical corrosion and mechanical properties of chromium-nickel steel are investigated. It is shown that under the conditions of some corrosive media the chromium-nickel-molybdenum steel can…
Using the Kol'sky method, the authors studied dynamic diagrams of uniaxial compression of aluminum alloys AD-1, AMg-6, and D-16. These alloys are applied in aviation, space technologies, shipbuilding and many other industries. Alloys similar to the above mentioned alloys have been studied abroad as well (for example,…
K Vogel, A Lenk, H Lichte, H-J Engelmann, U Mühle, B Freitag; Off-axis Electron Holography for 2D Dopant Profiling in p- and n-Metal Oxide Semiconductor Fi
The aim of this paper is to compare visco-plastic behavior of lead and a lead alloy over a wide range of temperature and strain rate. Compression test data have been obtained on stress variation with strain. Quasi-static compression tests were carried out on a MTS facility, while dynamic test results were obtained usi…
Abstract Stable protected 3‐triisopropylsilylethynylpyrrole, 4b , was prepared in the yield 73% by first observed selective deprotection of double protected 1‐triisopropylsilyl‐3‐triisopropylsilylethynylpyrrole, 3b , which was obtained in the yield 44%. This deprotection in preference proceeds at the pyrrole nitrogen…
Composite materials are used in applications that require protection against high velocity impacts by fragment simulating projectiles. In this work, the ballistic performance of two commercially available materials against a fragment simulating projectile (FSP) is studied. The materials used were an aramid fiber with…
The Varying Temperature Irradiation Experiment in the High Flux Isotope Reactor (HFIR) was carried out in the framework of the Japan-USA fusion cooperation program (JUPITER). The objective of the experiment is to investigate the performance of fusion structural materials subject to temperature variation during operati…
Mixed lead chloride oxalate, Pb 2 Cl 2 (C 2 O 4 ), has been obtained in a polycrystalline form in the course of a study on precursors of nanocrystalline PZT-type oxides. Its crystal structure has been solved ab initio from powder diffraction data collected using a monochromatic radiation from a conventional X-ray sour…
Approaches to the spatial harmonic characterization of the field due to a symmetrically shielded permanent bar magnet are presented. At first, exact spherical harmonic coefficients are obtained for a given unshielded magnet and comparisons are made with the coefficients of unshielded numerical models. In the calibrati…
An experiment analyzing the kinetics of dissolution of a solid with cylindrical geometry in water is presented. The dissolution process is followed by measuring the solid mass and its size parameters (thickness and diameter) as a function of time. It is verified that the dissolution rate follows the Nernst model. Data…