Materials Literature
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The results of measurements of spin correlations and magnetonuclear cross-correlations (MNCCs) in the system 154 Sm 1− x Sr x MnO 3 with the perovskite structure ( x =0.25,0.4) in the low-temperature phase in magnetic fields 0< H <1 kOe are presented. These are the first measurements performed by the small-angle polar…
The use of biodegradable polymers in animal nutrition can be considered not only as a possible way of waste recycling but could also be beneficial in the derivation of animal products from the conversion of these energy‐rich substances within the nutritional chain. However, earlier studies with swine and sheep as well…
The absorption spectra and the melting and crystallization kinetics of CuCl nanocrystals in glass are investigated in the range of particle radii 1–30 nm. Three discontinuities are found on the curves representing the size dependence of the melting point T m ( R ) and the crystallization point T c ( R ). As the partic…
Abstract The oxygen and hydrogen isotope compositions of volcanic ash layers from coastal outcrops of the Miocene Monterey Formation elucidate the progressive burial diagenesis of glass to bentonite and metabentonite. Volcanic glass that texturally appears unaltered is found to have δ l8 O and δD values that are signi…
Gadolinium and dysprosium diethylenetriamine pentaacetic acid-labeled starch microparticles (Gd-DTPA-SP and Dy-DTPA-SP) were investigated as model liver contrast agents. The liver contrast efficacy of particles with low and high metal contents was compared in two imaging models: in vivo rat liver and ex vivo perfused…
The electron emission characteristics of planar field emission arrays (FEAs), containing undoped and boron-doped diamondlike carbon (DLC) films as emitters, were investigated. The planar DLC FEAs require only 13.3 V/µm to turn on the electron field emission, whereas the boron-doped planar DLC FEAs requires an even low…
The tensile response of staple yams is usually determined by their structure and the mechanical properties of their constituent fibers. Yarn structure is influenced by the radial disposition of fibers along the yam length, commonly known as migration, and the packing density of the fibers in the yarn cross section. Th…
Duplex stainless steels were gas tungsten arc welded without filler material in various Ar–N 2 mixed gas atmospheres. Weld metals having different nitrogen contents were annealed at 900–1300 K to examine the single effect of nitrogen on the σ transformation. Nitrogen content of the weld metal did not influence the nos…
Structural radiation protection for diagnostic X-ray facilities is most commonly performed following the recommendations of the National Council on Radiation Protection and Measurements Report No. 49. A number of analytical methods have already been developed to improve the design of these facilities. Specifically, th…
We present the results of Monte Carlo simulations of a nematic liquid crystal confined to a cylinder with homeotropic surface anchoring. The nematic is modelled using the LebwohlLasher model. For low values of the cylinder radius or anchoring strength, a stable planar polar configuration with two line defects is readi…
A molecular theory of the nematic-isotropic phase transition is developed for the fluid composed of rod-like particles with large longitudinal dipoles. The equilibrium between the monomers and dimers with antiparallel dipoles is explicitly taken into account and the concentration of dimers is determined self-consisten…
Electrical conductivity during the XPS of ∽100 nm thick films of poly(methyl methacrylate) (PMMA) on silicon was induced by heating to above 100°C. Rapid x-ray-induced depolymerization set in at about the same temperature. The electrical conductivity allowed acquisition of high-resolution core line and valence band sp…
The shift of the volume plasmon energy with particle size in cadmium sulphide nanoparticles was examined by energy filtered transmission electron microscopy. This technique allowed the plasmon energy of individual, well-separated particles to be measured. The measured plasmon energy was found to increase with decreasi…
Efficient generation of the second optical harmonic is observed experimentally in a multilayer periodic structure based on porous silicon. The second-harmonic signal is much stronger than the signal from a uniform porous silicon layer or from the single-crystal silicon substrate. The orientational dependence of the se…
The crystal structures of olivine-type Mg_{2-x}Mn x SiO 4 ( x = 0, 1, 1.4 and 2) were refined using high-resolution synchrotron radiation data and the Rietveld method, adopting the new weight function with the form 1/Y_o^e\;(e\simeq 2) ( Y o is the observed profile intensity) [Toraya (1998). J. Appl. Cryst. 31 , 333–3…
Load-bearing craze fibrils are fundamental to the ability of many polymer materials to support applied tensile stress. Three models of the scattering from craze-fibril structures have been compared through a rigorous analysis procedure. The results indicate that a diffuse-boundary model provides a more accurate descri…
Abstract Two clay fractions of a Cambrian claystone from Estonia, consisting essentially of illite and 20% expandable illite-smectite, (I-S) were treated with C 12 and C 18 alkylammonium cations for K-exchange. Both the untreated and treated samples were dated by the K-Ar method. The treated clays lost several percent…
Nanopowders of Bi2Ti2O7 with various Na+ modifications were synthesized by chemical coprecipitation, and their phase structures transform into a solid solution of Bi4Ti3O12 and Bi2Ti4O11 after sintering at high temperature. The dielectric peak at around 517 °C in Bi4Ti3O12 is related to the domain transformation at 44…
The principal criteria for the corrosion resistance of intermediate-grade ferritic stainless steels (SS) were examined in a neutral chloride (Cl−) solution. The effect of increasing quantities of chromium and molybdenum was estimated for several heats in terms of the breakdown potential (Eb). The effect of inclusions…
Large sign-alternating charge clusters formed by the charged side groups of amino acid residues and N- and C-terminal groups were found in the majority of considered globular proteins, namely 235 in a total of 274 protein structures, i.e. 85.8%. The clusters were determined by the criteria proposed earlier: charged gr…