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Evaluation of the biocompatibility of a new biomembrane
Biocompatibility has been considered one of the most important items to validate a biomaterial for its application in human organisms. The present work evaluates the biocompatibility of a new biomembrane using in vivo assay in different animal species. The experiments to evaluate the cellular reaction were carried out…
Editorial
Mathematical modeling and experimental analysis of the hardened zone in laser treatment of a 1045 AISI steel
The aim of this work is to develop a mathematical model to predict the depth of laser treated zone in the LTH process. The Fourier equation of heat conduction is solved by using the Finite Difference Method in cylindrical coordinates in order to study the temperature distribution produced in a workpiece and hence to o…
Synthesis, characterization and determination of the metal ions adsorption capacity of cellulose modified with p-aminobenzoic groups
This paper describes the synthesis and characterization of p-aminobenzoic modified cellulose (Cell-PAB), as well as the separation and preconcentration of Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II) ions from an aqueous medium using a Cell-PAB bath and the column technique. The quantity of p-aminobenzoic groups attached…
Synthesis and Characterization of Electrochromic Polyamides with Well‐Defined Molecular Structures and Redox Properties
Abstract In this paper we report the synthesis and characterization of a series of electrochromic polyamides (alternating copolymers). The synthesis proceeds via the condensation polymerization between amine‐capped oligoaniline and acyl chlorides such as isophthaloyl dichloride, terephthaloyl chloride, azelaoyl chlori…
Effect of porosity on the tensile properties of low ductility aluminum alloys
The literature contains reports of several studies correlating the porosity and mechanical properties of aluminum alloys. Most of these studies determine this correlation based on the parameter of global volumetric porosity. These reports, however, fail to separate the effects of microstructural features and porosity…
High Curie temperatures in ferromagnetic Cr-doped AlN thin films
Al 1−x Cr x N thin films with 0.02⩽x⩽0.1 were deposited by reactive co-sputtering onto c-plane (001) sapphire. Room-temperature ferromagnetism with a coercive field of 85 Oe was observed in samples with chromium contents as low as x=0.027 (2.7%). With increasing Cr content the mean magnetic moment is strongly suppress…
Deformations and Thermal Stability of Carbon Nanotube Ropes
Structural and thermal characteristics of crystalline ropes of single-wall carbon nanotubes (SWCNTs) are investigated. Novel crystalline ropes of polygonized SWCNTs produced by laser irradiation exhibit rounded-hexagonal cross sections in contrast to earlier observations of circular tubes. Extensive molecular dynamics…
Upconversion Luminescence in Er 3+ Doped and Yb 3+ /Er 3+ Codoped Yttria Nanocrystalline Powders
Y 1.9 Er 0.1 O 3 and Y 1.7 Yb 0.2 Er 0.1 O 3 nanocrystalline powders were prepared via a reverse‐strike coprecipitation method using nitrates and ammonia as raw materials. The obtained powders were of cubic‐phase structure of Y 2 O 3 and the particle size was in the range of ∼60–80 nm. Strong red ( 4 F 9/2 – 4 I 15/2…
Array factor approach of leaky-wave antennas and application to 1-D/2-D composite right/left-handed (CRLH) structures
An array factor approach of leaky-wave (LW) antennas is proposed for efficient and fast computation of the radiation patterns of complex metamaterial LW structures of arbitrary length from the analysis of a single periodic unit cell. This approach is demonstrated in one-dimensional and two-dimensional composite right/…
Role of Phonon Dispersion in Lattice Thermal Conductivity Modeling
The role of phonon dispersion in the prediction of the thermal conductivity of germanium between temperatures of 2 K and 1000 K is investigated using the Holland approach. If no dispersion is assumed, a large, nonphysical discontinuity is found in the transverse phonon relaxation time over the entire temperature range…
Factors affecting potassium leaching in different soils
Abstract. A set of lysimeter based experiments was carried out during 2000/01 to evaluate the impact of soil type and grassland management on potassium (K) leaching. The effects of (1) four soil textures (sand, loam, loam over chalk and clay), (2) grazing and cutting (with farmyard manure application), and (3) K appli…
Development of an Artificial Saliva Solution for Studying the Corrosion Behavior of Dental Alloys
The corrosion behavior of dental alloys often is evaluated in artificial saliva solutions. In the literature, it was found that several solutions have been used, but no information indicating whether they really behave as natural saliva does, or whether they can be compared with each other, was mentioned. In the prese…
Oxidizer−Fuel Interactions in Aqueous Combustion Synthesis. 1. Iron(III) Nitrate−Model Fuels
Aqueous (solution) combustion synthesis of iron oxide is investigated using iron(III) nitrate nonahydrate and three model fuels, each containing one specific functional group. The investigated ligands, in order of experimentally determined reactivity, are −NH 2 > −OH > −COOH, where only the amino group triggers a vigo…
Electronically scanned composite right/left handed microstrip leaky-wave antenna
A novel electronically scanned periodic microstrip leaky-wave (LW) antenna based on the concept of composite right/left-handed (CRLH) metamaterials is presented. This antenna includes varactors modulating the capacitive loading of the unit cell and therefore the propagation constant of the structure, which results in…
Synthesis and Characterization of Bifunctionalized Ordered Mesoporous Materials
Abstract Direct synthesis (co‐condensation reaction) and post‐synthesis reaction (grafting) are combined for the first time to efficiently fabricate bifunctionalized ordered mesoporous materials (OMMs). Ethylenediamine‐containing OMMs (ED‐MCM‐41) were first synthesized via direct synthesis and then further modified by…
High microwave permittivity of multiwalled carbon nanotube composites
Complex permittivity spectra of the multiwalled carbon nanotube (MWNT)-epoxy composites with mass concentrations up to 25.9% were measured from 10 MHz to 20 GHz. The composites exhibit high real and imaginary relative permittivities over broad bandwidth, showing strong dependence on the MWNT loading. It is observed th…
Intraply and interply hybrid composites based on E‐glass and poly(vinyl alcohol) woven fabrics: tensile and impact properties
Abstract E‐glass and poly(vinyl alcohol) (PVA) fibres were used to produce both homogeneous and hybrid composites with an orthophthalic unsatured polyester resin. Results are presented regarding the tensile and impact behaviour of both intraply and interply hybrid composites, with particular regard to the effects of t…
Novel Hyperbranched Poly([1,2,3]‐triazole)s Derived from AB2 Monomers by a 1,3‐Dipolar Cycloaddition
Abstract Summary: Novel hyperbranched poly([1,2,3]‐triazole)s were synthesized from several AB 2 monomers by a 1,3‐dipolar cycloaddition reaction. The compound 3,5‐bis(propargyloxy)benzyl azide was polymerized thermally at room temperature leading to 1,4‐ and 1,5‐disubstituted poly([1,2,3]‐triazole) and catalytically…