Materials Literature
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Abstract Field‐emission (FE) electron and ion microscopies (FEM and FIM), I ( V ) characteristics, and FE energy spectroscopy (FEES) measurements have been made on individual multiwalled carbon nanotubes (MWNTs) at various stages of their evolution under various thermal and field treatments. Before the highest tempera…
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Abstract The Na–H system thermodynamic properties were assessed using Gibbs free energy model parameters obtained from best fit optimizations to combined experimental and first-principles predicted data. The first-principles finite temperature thermodynamic property predictions, based upon density functional theory gr…
In this work we report on our algorithm for generating 3–D virtual structures resembling un-bonded fibrous webs. The paper discusses short and infinitely long fibers, each emulating a category of nonwoven fibrous medium. The structure Solid Volume Fraction (SVF), being the most important characteristic of a fibrous po…
SUMMARY Fragilaria rumpens (Kütz.) G. W. F. Carlson is assumed to be a cosmopolitan species, and is often reported from ponds and lakes. Nevertheless, this species is similar to both Fragilaria capucina Desm. and Fragilaria vaucheriae (Kütz.) J. B. Petersen and, as a consequence, the taxonomy of all three species has…
Chitosan is a biopolymer derived from chitin in crustacean shells. Over the past decade it has been studied as an environmentally benign wood-protecting agent. It is assumed to act as a fungi-stat against a wide range of fungi and even as a fungicide at higher concentrations. This study investigated the properties of…
The early phase of severe accidents in VVER reactors was simulated in the CODEX (COre Degradation EXperiment) facility with electrically heated fuel rod bundles. The selected test conditions and applied measurement techniques made possible the observation of some specific phenomena, such as the protective role of oxid…
This article briefly reviews the progress in ultraviolet (UV) or photoinitiated grafting for improving the adhesion property of polyethylene (PE). The first part involves the progress in the fundamental study of UV grafting, including the grafting methods, the photoinitiators, and the self-initiated grafting; the seco…
Porous and dense silicon nitride films with low (1.58) and high (1.88) refractive indices were prepared by using successively microwave and radio frequency (rf) plasma-enhanced chemical vapor deposition. Surface treatments were performed on porous layers using argon and nitrogen rf plasmas in order to densify and flat…
In this study, experiments were conducted to examine the drafting behavior of non-circular fiber (cross-shaped profiled polyester) to obtain the optimum drafting conditions for spinning polyester/cotton (P/C) blended yarn. The drafting force in the break draft zone was measured and the effects of roller gage, draft ra…
This paper presents the synthesis of two new glucosyl tritolylporphyrins in which the carbohydrate moiety is connected through a carboxymethyl glycosidic α‐D‐linkage. These compounds have been obtained by reaction between porphyrins bearing an amino function with a lactone prepared from the available disaccharide isom…
Poly(urethane urea)s with hard segments derived only from diisocyanate linked via urea linkages were synthesized using a new and simple one-pot method. The creation of urea linkages were done via creating the amine in situ by adding water in vapor phase slowly and continuously. This synthesis method eliminates the ted…
his work investigates the properties of an antenna-like configuration with an electric line source radiating in the presence of a double-negative circular cylinder. First, the analytical eigenfunction-series solution is derived. Second, this solution is employed in numerical calculations to study the properties of the…
Small-diameter ZnO nanorods (∼10nm) with lengths of 80–100nm were synthesized by a simple solution route at low temperature (61.2°C). X-ray diffraction and high-resolution transmission electron microscopy analyses confirmed that the nanorods are hexagonal single crystals with a growth direction along [001]. Room tempe…
The ac susceptibility of the uniaxial relaxor strontium barium niobate, Sr 0.61 Ba 0.39 Nb 2 O 6 , the quantum ferroelectric strontium titanate, SrTi 18 O 3 , and the periodically poled superionic ferroelectric potassium titanyl phosphate, KTiOPO 4 , reveals different modes in dependence on the frequency. Relaxation o…
High birefringence and low viscosity isothiocyanate liquid crystal single compounds, and eutectic mixtures based solely on unsaturated rigid core structures, are reported. Extraordinarily high values of figure‐of‐merit were observed at room temperature for the formulated nematic mixtures. Potential applications of suc…
A review is presented of the data on the design of polymer-containing piezoelectric materials: electrets exhibiting a piezoelectric effect, ferroelectric polymers, piezoelectric composites (piezoelectric ceramic + polymer), and new piezoelectric polymer materials, such as piezoelectrics based on porous polymers and el…
Abstract Gadolinium calcium oxoborate, GdCa 4 O(BO 3 ) 3 (GdCOB), single crystals were grown by the Czochralski technique. The orientation of crystal was precisely determined. To estimate the complete matrices of the elastic (13) and piezoelectric (10) coefficients measurements of the complex electrical impedance for…
Polarization properties of a twisted nematic liquid crystal cell are fully characterized by an equivalent optical system that consists of a retarder wave plate and a rotator. In this paper we show that this result is of interest to optimize the light-modulation capabilities of a voltage-addressed liquid crystal displa…
The grand canonical Monte-Carlo (GCMC) method is used to simulate the adsorption of water molecules on a spherical soot particle. Soot is modelled by graphite-type layers arranged in an onion-like structure. The calculated water adsorption isotherm at 298 K exhibits two plateaus, corresponding to the filling of the in…