Materials Literature
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The characteristics of annular amplitude and phase filters are compared. The behavior of two-zone phase and amplitude filters as the inner zone is increased is studied in detail. Numerical simulations show that a phase filter can achieve a superresolution effect, a circular Dammann effect, and flat-topped intensity fo…
Abstract Previous attempts to use illite as a geothermometer have failed: no general relation between the mineral's chemical composition and temperature of crystallization has been found. Here, chemical compositions of 27 illite samples from five different geothermal fields (the data on four of which were drawn from t…
We report on the bulk and surface properties of dispersions consisting of nonstoichiometric polyelectrolyte complex (PEC) nanoparticles. PEC nanoparticles were prepared by mixing poly(l-lysine) (PLL) or poly(diallyldimethylammonium chloride) (PDADMAC) with poly(maleic acid-co-alpha-methylstyrene) (PMA-MS) or poly(male…
In this study, spandexes of three degrees of fineness are used as the core material with cotton fibers as the sheath to spin fine elastomeric yarns. We observe the cross sections of the core yarns and the migration of the spandex inside the core yarn concluding that producing a finer elastomeric yarn with a uniform st…
The influence of the support ionicity on the adsorption of H, CH x ( x = 2, 3), and O on supported Pt particles is investigated using density functional theory (DFT). The DFT calculations reveal that the importance of the 6s,p states for the Pt adsorbate bonding increases in the order Pt−O < Pt−CH 2 < Pt−CH 3 < Pt−H.…
The effects of temperature, frequency, and molarity on the dielectric behaviour and ac electrical conductivity have been studied for nanosized samples of MgAl 2 O 4 prepared by chemical co-precipitation technique. X-ray powder diffraction (XRD) study shows that the particle size is 8 nm and the system is orthorhombic.…
This work presents the design and test results of a charged-particle solid-state detector with ultrafast signal response based on polycrystalline chemical-vapor-deposition (pCVD) diamond as active detector material and a high-bandwidth RF amplifier. We tested the detector at the Indiana University Cyclotron Facility B…
We present measurements of the optical spectra on Na(0.7)CoO(2) single crystals. The optical conductivity shows two broad interband transition peaks at 1.6 eV and 3.1 eV, and a weak midinfrared peak at 0.4 eV. The intraband response of conducting carriers is different from that of a simple Drude metal. A peak at low b…
An improved synchrotron microradiography technique is being used to study dendrite growth and coarsening in Sn-13%Bi alloy in real time. The morphology of growing dendrites can be well resolved with reasonable image contrast. Dendrite arm remelting, coalescence, and fragmentation have been observed in a real alloy and…
The electronic properties, redox properties, protonation, and stability of five [alpha-PTi(2)W(10)O(40)](7)(-) isomers have been investigated employing density-functional theory (DFT) method. The results reveal that the stability of [alpha-1,2-PTi(2)W(10)O(40)](7)(-) and [alpha-1,6-PTi(2)W(10)O(40)](7)(-) is weaker an…
The paper presents new findings concerning the role of microstructural variations in the localised corrosion of a magnesium alloy AZ91. The alloy with prior solution treatment (T4 condition), when subjected to aging treatments (T6 condition), developed intermetallic β phase (Mg17 Al12), which is cathodic to the alloy…
Monodispersed nanosized yttrium aluminum garnet (YAG) powder was synthesized via a mixed‐solvent thermal method using stoichiometric amounts of inorganic aluminum and yttrium salts. Pure‐phase YAG crystalline powder was obtained at low temperature (290°C) and low pressure (10 MPa). The resulting products were characte…
In this study the inhibitive behaviour of benzotriazole, 5-methyl benzotriazole, 5-chloro benzotriazole and 5-nitro benzotriazole on the corrosion of pure aluminium in 0.1M HCl has been investigated by the potentiostatic polarisation technique. For this purpose, corrosion potentials Ecorr, corrosion rates icorr, anodi…
Abstract This article is a compilation of color etchants that have been developed for a limited number of metals and alloys. It describes the optical methods for producing color, such as polarized light and differential interference contrast, with illustrations. The article discusses film formation and interference te…
Abstract The mineralogy and geochemistry of the clay fraction of Victoria Land Basin (Ross Sea, Antarctica) sediments was investigated, to determine the origin of clay minerals and the features of authigenic smectite. The investigated core (CRP-3) is ~800 m long, mostly of Oligocene age. The clay fraction of the upper…
Post-irradiation annealing (PIA) was conducted in order to clarify the role of microstructural and microchemical effects on irradiation assisted stress corrosion cracking (IASCC) susceptibility in simulated pressurized water reactor (PWR) primary water. Microstructures, hardening, radiation-induced segregation and IAS…
Hybrid composites consisting of polypropylene (PP) and short sisal fibers were prepared by melt mixing followed by compression molding. Various types of chemical treatments such as alkali treatment, cyanoethylation, coupling agent treatment etc. were performed to improve the interfacial adhesion between the fibers and…
[structure: see text] A bimodal target-specific contrast agent based on a cyclic peptide containing the target-specific NGR sequence, gadolinium(III) diethylenetriaminepentaacetic acid (Gd(III)DTPA), and Oregon Green 488 (OG488) suitable for both MR imaging and optical imaging of angiogenesis is developed. The synthet…
Latex from Calotropis procera is widely used in folk medicine as a rich source of biologically active compounds capable of promoting diverse benefits such as control of dermal fungal infections, antimicrobial activities and pain relief among other useful properties. The aim of this work was to characterize the anti-in…
A classical force field for poly(dimethylsiloxane) (PDMS) and its oligomers has been derived on the basis of intermolecular binding energies, molecular geometries, molecular electrostatic potentials, and conformational energies obtained from quantum chemistry calculations on model compounds. The force field accurately…