Materials Literature
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This article studies the electric response of an electrically small hemispherical object with negative permittivity by computing its polarizability which is determined by two orthogonal components, the axial one and the transverse one. A certain range of negative permittivity values is found where the mathematical det…
Abstract We present a flexible touch‐sensitive writing tablet utilizing a reflective bistable cholesteric liquid crystal laminated between two conductive‐polymer coated polyethylene‐terephthalate substrates. The device features a selective pressure response suitable for high‐resolution lines to be drawn into the scree…
The dynamic yield stress and the dynamic strength were measured for D16T aluminum alloy samples loaded by plane shock waves of submicrosecond duration. The temperature was varied from 20 to 470°C. It is established that the dynamic yield stress of the alloy decreases upon heating due to annealing. The dynamic yield st…
The organization of nematic liquid crystals in thin cells with one surface topographically patterned by thiolene step and flash nanoimprint lithography was studied using depolarizing transmission light microscopy. Planar bistable organization was observed for 2 and 4μm wide square grid patterns in agreement with model…
Estimates are made of the effect of tissue confinement on the response of small bubbles subjected to lithotriptor shock pressures. To do this the Rayleigh-Plesset equation, which governs the dynamics of spherical bubbles, is generalized to treat a bubble in a liquid region (blood), which is in turn encased within an e…
High rate (> 50 μm/h) growth of homoepitaxial single-crystal diamond (SCD) is carried out by microwave plasma chemical vapour deposition (MPCVD) with added nitrogen in the reactant gases of methane and hydrogen, using a polycrystalline-CVD-diamond-film-made seed holder. Photoluminescence results indicate that the nitr…
We report on strain measurements in Ni-Mn-Ga, Ni-Mn-In, Ni-Mn-Sn and Ni-Mn-Sb polycrystalline alloys as a function of temperature and magnetic field. Experiments are carried out in the austenitic and martensitic phases of the alloys. It is shown that in the cubic phase the magnetostrain is similar for all systems but…
Pitting Corrosion behaviour of similar and dissimilar metal welds of three classes of stainless steels, namely, austenitic stainless steel (AISI 304), ferritic stainless steel (AISI 430) and duplex stainless steel (AISI 2205), has been studied. Three regions of the weldment, i.e. fusion zone, heat affected zone and un…
Eleven self-complementary G/\C derivatives bearing hydrophobic moieties were synthesized and characterized. One representative derivative from this family was shown to self-assemble into rosette nanotubes in hexane and form Langmuir-Blodgett films at the air-water interface.
The structure of the natural mineral calcio-olivine (γ-Ca2SiO4) found in skarn xenoliths in the region of the Lakargi Mountain (North Caucasus, Kabardino-Balkaria, Russia) is refined by the Rietveld method [a = 5.07389(7) Å, b = 11.21128(14) Å, c = 6.75340(9) Å, V = 384.170(5) Å3, Z = 4, ρcalcd = 2.98 g/cm3, space gro…
Novel fluorescent silkworm silks incorporated with CdTe quantum dots (QDs) have been prepared via electrostatic assembly using a polyelectrolyte (PE) as a fixer. The bright fluorescence of the silks/QDs obtained could be tuned from green to near-infrared (NIR) by changing the QD size, thereby enabling the fluorescence…
We report on structural, magnetic, and transport properties of La0.7Ba0.3MnO3 thin films, epitaxially grown on MgO substrates. Despite the quite similar structural features if compared to crystalline manganite films, our samples show a metal-insulator transition temperature of about 200K, sizeably lower than the bulk-…
In situ synthesis of bulk Al 3 BC 3 was achieved via a reactive hot‐pressing method using Al, B 4 C, and graphite powders at 1800°C for 2 h. The reaction path for synthesizing Al 3 BC 3 was investigated. It was found that Al 3 BC 3 formed via the reaction of C, B 4 C, and Al 4 C 3 above 1180°C. Dense Al 3 BC 3 was pre…
For various polyethylenes at ambient and elevated temperatures, tensile deformation was characterized by measurements of true stress-true strain curves at constant strain rates, the determination of the elastic and plastic part of strains, and registrations of the stress relaxation at fixed strains. Some peculiar feat…
Lake St. Lucia, South Africa's largest estuarine system, was isolated from the sea by a beach berm throughout a severe drought from 2002 to 2007, with the lake water level being extremely low over much of its total area. A reverse salinity gradient resulted, with the lowest salinity in the south near the sea and the h…
Jahnsite-(NaFeMg), NaFe 3+ Mg 2 Fe 2 3+ (PO 4 ) 4 (OH) 2 ·8H 2 O, space group P2/a, a = 15.0811(16), b = 7.1403(8), c = 9.8299(11) Å, β = 110.445(1)°, V = 991.8(2) Å 3 , and Z = 2, is a new mineral from the Tip Top mine, Custer County, South Dakota. It occurs as the dominant chemical zone in transparent pseudo-orthorh…
This paper outlines the research carried out on the sonochemical degradation of 2-chlorophenol in the presence and absence of chlorinated compounds. The degree of enhancement varied according to the characteristics of chlorinated compounds. The higher oxidation states of carbon in chlorinated compounds increase the de…
Partial oxidation of an aqueous solution of CoIICl(2).6H2O with (NH4)6[Mo7VIO24].4H2O in the presence of (NH4)2SO3.H2O and LiCl, at pH approximately 5.3, leads to isolation of the octanuclear cluster (NH4)11(Li subset[Co4IICo4III(SO3)16(NH3)8].10H2O), 1. The structure of the anion of 1 consists of a central [Co4II], a…
The present understanding of magnetic properties of quasicrystals (QCs) is reviewed. In AlMn and AlPdMn QCs, only a few Mn atoms, with concentrations from a few per cent down to 10−4 carry a localized magnetic moment. These moments are coupled via RKKY interactions, leading to a canonical spin-glass ordering at low te…
Effect of Mn-Doping on the Piezoelectric Properties of (K0.5Na0.5)(Nb0.67Ta0.33)O3 Lead-Free Ceramics, Watanabe, Yoshiki, Sumida, Kenichi, Yamada, Seiji, Sago, Sumihito, Hirano, Shin-ichi, Kikuta, Koichi