Materials Literature
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This paper studies elastic buckling of individual multiwall carbon nanotubes under radial pressure. The analysis is based on a multiple-elastic-shell model in which each of the concentric tubes of a multiwall carbon nanotube is described as an individual elastic shell. According to their radius-to-thickness ratios, th…
T he structure and dielectric behaviour of the valence compensated system Sr1 -xLaxTi1 -x CrxO3 (x • 0·50) have been studied. Complex plane and spectroscopic studies of the impedance and modulus functions have been made in the temperature range 100-550 K to separate out the various contributions to the overall polaris…
Abstract When the metallic trigger in a commercial heat pack is flexed to initiate solidification, the acceleration of the liquid near the solid surface can cause cavitation and collapse of small vapor bubbles. It is investigated whether such cavitation is responsible for the operation of the metallic trigger in the s…
This paper presents the results of experimental studies of relief-phase holograms produced by introducing an additional bleaching operation into the processing procedure. It shows that it is possible to significantly increase the surface-relief height by the effective modulation of short-wavelength UV radiation in the…
Abstract The complex Eu(btfa) 3 (phen) (btfa=4,4,4‐trifluoro‐1‐phenyl‐1, 3‐butanedione, phen = 1,10‐phenanthroline) has been prepared and characterized by elemental analysis, IR and UV spectroscopies. The crystal and molecular structures of the complex have been determined by X‐ray diffraction analysis. It belongs to…
Electric fields in polymeric insulation are calculated with the boundary element method (BEM) in the presence and absence of space charge. A 3-D version of the BEM software is employed to determine the profiles of divergent electric fields produced by metallic and semicon needles embedded in the polymeric insulation.…
A fracture wave (FW) in a brittle material is a narrow transition region (border) of a continuous fracture zone, which may be associated with the damage accumulation process initiated by propagation of shock waves. In multidimensional structures the fracture wave may behave in an unusual way. The high-speed photograph…
The high-pressure carbon monoxide (HiPco) technique for producing single-wall carbon nanotubes (SWNTs) is analyzed with the use of a chemical reaction model coupled with flow properties calculated along streamlines, calculated by the FLUENT code for pure carbon monoxide. Cold iron pentacarbonyl, diluted in CO at about…
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Abstract The silicone rubber vulcanizate powder (SVP) obtained from silicone rubber by mechanical grinding exists in a highly aggregated state. The particle size distribution of SVP is broad, ranging from 2 µm to 110 µm with an average particle size of 33 µm. X‐ray Photoelectron Spectroscopy (XPS) and Infrared (IR) Sp…
A method to tune the thickness and number of available functional groups of micropatterned layers of a polycation stamped onto weak polyelectrolyte multilayers has been developed. Specifically, poly(allylamine hydrochloride) (PAH) was transferred using polymer-on-polymer stamping to create chemically patterned regions…
In 2001 a qualitative analysis of the centric diatoms in Lake Como was made. In this work 15 taxa of the genus of Stephanodiscus, Cyclotella, Melosira, Aulacoseira and Stephanocostis were recorded. Among them the taxa Cyclotella pseudostelligera, C. comensis, C. comensis morphotype minima, C. costei, Stephanodiscus mi…
Polystyrene (PS) and poly(tetramethyl bisphenol polycarbonate) (TMPC) form thermodynamically compatible mixtures below a lower critical solution temperature. In this regime, the PS-component in thin PS−TMPC films, supported by SiO x /Si substrates, preferentially enriches the free surface, forming a wetting layer, whe…
The thermomechanical behavior of passivated thin copper films is studied. Stresses in copper films of thickness ranging from 125 to 1000 nm, deposited on quartz or silicon substrates and passivated with silicon oxide, were measured using the curvature method. The thermal cycling spans a temperature range from −196 to…
High‐resolution solid‐state 31 P, 27 Al, and 23 Na nuclear magnetic resonance (NMR), Raman spectroscopy, differential scanning calorimetry, and density measurements were used to characterize the local structure of the glasses (1− x )(NaPO 3 ) 3 · x Al(PO 3 ) 3 . A systematic increase in density, glass transition tempe…
Nous avons etabli la composition de 135 echantillons de mineraux du groupe de l'astrophyllite provenant de 151 endroits au moyen de la microsonde electronique, des analyses ICP-AES, spectrometrie infra-rouge avec transformation de Fourier, analyse thenmogravimetrique, decomposition thermique, analyse par reactions nuc…
Room‐temperature debonding and sliding of fibers coated with La‐monazite is assessed using a composite with a polycrystalline alumina matrix and fibers of several different single crystal (mullite and sapphire) and directionally solidified eutectic (Al 2 O 3 /Y 3 Al 5 O 12 and Al 2 O 3 /Y‐ZrO 2 ) compositions. These f…
Abstract Water extracts from leaves of date palm, phoenix dactylifera , henna, Lawsonia inermis , and corn, Zea mays , were tested as corrosion inhibitors for steel, aluminum, copper and brass in acid chloride and sodium hydroxide solutions using weight loss, solution analysis and potential measurements. The inhibitio…
Abstract The effect of CO 2 on the isothermal crystallization kinetics of poly(ethylene terephthalate), PET, was investigated using a high‐pressure differential scanning calorimeter (DSC), which performed calorimetric measurements while keeping the polymer in contact with presurized CO 2 . It was found that the crysta…
Hiroshi Miyamoto, Masato Yano, Tomoyuki Miyashita; Similarities in the structure of nacrein, the shell-matrix protein, in a bivalve and a gastropod, Journal of