Materials Literature
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(Bi 1/2 Na 1/2 )TiO 3 (BNT) is a prominent candidate for a lead‐free piezoelectric material. In this study, BNT was synthesized using the solution/sol–gel method, in which a solution of Bi 2 O 3 and Na 2 CO 3 was dissolved in HNO 3 as starting materials. The solution then was mixed with ethylene glycol and titanium te…
Abstract The equimolar reaction of calcium bis[bis(trimethylsilyl)amide] with 2,2,6,6‐tetramethylheptane‐3,5‐dione (Htmhd) in THF yields liquid mononuclear [Ca(tmhd){N(SiMe 3 ) 2 }(THF) 3 ] ( 1 ). A similar reaction in toluene with a stoichiometric ratio of 2:3 gives the dinuclear complex [{(THF)Ca} 2 (tmhd) 2 (µ‐tmhd…
A Mathcad™ implementation of the 1997 IAPWS Industrial Formulation for steam and water properties is described. Routines are easily encoded in this environment, execute quickly and accurately, and can accept any thermodynamic units for input and output. They can be used for a wide range of thermodynamic calculations i…
The irreversible and reversible straining (superplasticity and superelasticity) of the single crystal Ni/sub 49.7/Mn/sub 29.1/Ga/sub 21.2/ sample stressed compressively under a static magnetic field up to 1 T is described and successfully modeled. The sample possesses a five-layered martensitic structure at room tempe…
ABSTRACT: Water barrier properties of various edible films: acetylated monoglycerides (AMG), dark chocolate (DC), and wheat gluten (WG) were evaluated through water sorption isotherm, diffusivity, and permeability measurements. Diffusivity and sorption isotherm were then used in a mathematical model for predicting moi…
Raman scattering on bulk As x S1− x glasses shows that vibrational modes of As4S4 monomer first appear near x = 0.38, and their concentration increases precipitously with increasing x, suggesting that the stoichiometric glass (x = 0.40) is intrinsically phase separated into small As-rich (As4S4) and large S-rich clust…
A novel approach is proposed that quantifies the influence of parameter and control implementation uncertainties upon the states and outputs of finite-time control trajectories for nonlinear lumped and distributed parameter systems. The worst-case values of the states and outputs due to model parameter uncertainties a…
The fiber properties of lepidopteran silk depend on the amino acid repeats that interact during H-fibroin polymerization. The aim of our research was to relate repeat composition to insect biology and fiber strength. Representative regions of the H-fibroin genes were sequenced and analyzed in three pyralid species: wa…
Natural precipitates of metastable polymorphs of CaCO 3 , such as vaterite, are rarely found in nature however, they have been widely synthesized in laboratory under particular conditions (ie, supersaturated solutions, relative high temperatures, etc.). By SEM and XRD we recognize vaterite spherulites from culturable…
The synthesis and characterization of more than a hundred achiral compounds composed of banana-shaped molecules and belonging to eleven different homologous series are reported. All these symmetrical five-ring compounds are esters and are derived from resorcinol. The compounds have been systematically substituted by f…
Abstract Polymer nanocomposite is one of the highly discussed research topics in recent time. In this paper, we have reported the preparation and the properties of different nanoclays based on sodium montmorillonite, bentonite and potassium montmorillonite and organic amines of varying chain lengths, and Styrene Butad…
Dielectric spectroscopy (DS) techniques play a major role in gaining insight into important peculiarities of dielectric responses of materials. The principles of DS of solids are discussed starting from simple concepts. The physical basis is presented, emphasizing the meaning of the magnitudes and phenomena involved,…
Abstract The incorporation of decatungstate in polymeric membranes provides new heterogeneous photocatalysts for the oxidation of organic substrates performed in water under an oxygen atmosphere at 25 °C. The photooxidation of water‐soluble alcohols proceeds to completion, forming the carbonyl derivative as an interme…
The variation in the structure and properties of the many silver dressings now on the market might be expected to affect their antimicrobial properties. This study, which follows up a paper published last March, compares their performance.
A sensor is described that takes advantage of highly specific RNA–protein interactions and the light‐harvesting properties of conjugated polymers. Coordination between a cationic conjugated polymer (CP + ) and a negatively charged protein–RNA complex results in efficient Förster resonance energy transfer (FRET) from C…
At room temperature the optical transport and magnetotransport properties of homo-epitaxial MPCVD diamond layers with boron contents in the 2 × 1020 to 2 × 1021 cm−3 range are expected to be governed by the characteristics of the boron impurity band. A comparison of room temperature infrared transmittance reflectance…
Surfaces with two‐dimensional nanoring or nanoporous arrays and nanopatterned SAMs have been fabricated via the “colloidal crystal‐assisted capillary nanofabrication” (CCACN) method. The Figure shows the two‐dimensional poly(vinyl alcohol) (PVA) nanoring arrays generated using a delicate template and the controllable…
Six benzimidazole derivatives were investigated as corrosion inhibitors on mild steel in 1 M hydrochloric acid (HCl) using gravimetric and polarization techniques. Inhibitor efficiency was found to depend on concentration and on the structure of the molecules. The results were interpreted by means of an adsorption mod…
The activity of chitosan and oligo-chitosan on several plant insects and pathogens were studied. Chitosan was active against lepidopterous and homopterous insects; the mortality was 80%. The insecticidal activity of chitosan to Plutella xylostella L. was higher than that to Spodoptera exigua Hübner. The mortality of s…
Proteins found in mineralized tissues act as nature's crystal engineers, where they play a key role in promoting or inhibiting the growth of minerals such as hydroxyapatite (bones/teeth) and calcium oxalate (kidney stones). Despite their importance in hard-tissue formation and remodeling, and in pathological processes…