Materials Literature
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The results of the modification of AG-OV-1 activated carbon under various conditions (by atmospheric oxygen at elevated temperatures and by hydrogen peroxide or ozone) are given. The effect of the used modifier on changes in the porosity, surface state, and adsorption capacity of activated carbon is evaluated.
This study aims to evaluate the effects of colchicine on metabolic and structural changes in Bacillus megaterium ACBT03, enduring colchicine bioconversion. Electron microscopy examination of cells adapted to different concentrations of colchicine for its bioconversion to pharmacologically active 3-demethylated colchic…
Abstract Waterborne siloxane-containing polyurethanes (WSPU) were prepared by polyaddition reaction using poly(tetramethylene oxide)glycol (PTMG), polyethylene glycol (PEG), and α,ω-aminopropyl polydimethylsiloxane (APDMS) as mixing soft segments; 2,2-di(hydroxymethyl)propionic acid, as a hydrophilic chain extender; 1…
In this paper electrode miniaturization with prospective use in electro-catalysis or as sensors is proposed. To this purpose it was postulated that dispersion of metal particles in a polymer matrix increases the effective area, on the same geometric area. In addition, the catalytic effect would significantly improve t…
Polyhydroxyalkanoates (PHA) are natural polyesters stored by a wide range of bacteria as carbon source reserve. Due to its chemical characteristics and biodegradability PHA can be used in chemical, medical and pharmaceutical industry for many human purposes. Over the past years, few Burkholderia species have become kn…
In the conventional superconductors, the Cooper pairs are mediated by phonons, which is a process where only the correlations between the phonons and the charge properties of the electrons are needed. However, superconductivity can also be derived from other types of elementary excitations. The spin fluctuations are a…
The inland algal flora of Acadia National Park was studied based on over 200 samples from 119 localities. A total of 160 algal genera were found, representing 12 algal phyla. Among these were 140 new generic records for the Park. The most frequently encountered taxa were desmids and diatoms, and the genera and species…
Abstract The coagulation process of nascent fiber of cellulose with ionic liquid 1- allyl-3-methylimidazolium chloride (AMIMCI) as the solvent was studied during drywet spinning. The diffusion rate and the crystallization situation of nascent fiber were tested, its fracture morphology was observed, and the diffusion c…
Abstract The two‐dimensional problem of a crack in three‐dimensional quasicrystals subject to far field loadings is studied. The analysis is based on the generalized Lekhnitskii's formalism. The analytical expressions for both the entire fields and the asymptotic fields near the crack tip are determined. The fracture…
Porous reaction-bonded Si3N4-SiC composites were fabricated by using potassium chloride(KCl) as pore-forming agent. Green bodies with 20% SiC and 30% KCl in mass were subjected to presinter in Ar atmosphere at 1000~1200 and then reaction-sintered. The results indicated that Si3N4-SiC composites which with about 58.5%…
Cobalt nanoferrite particles were prepared by combustion method. The structures of the samples were studied with X-ray diffraction (XRD) using Cu-Kα radiation. The X-ray diffraction analysis revealed the nanocrystalline nature in the prepared ferrite samples. Dielectric and a. c. conductivity studies have been underta…
Perovskite-based (1-x) (Na0.5Bi0.5)TiO3-x NaNbO3 [(1-x) NBT-x NN, x = 0.1, 0.2, 0.3 and 0.4] ceramics were sintered at 1080°C. Dielectric characteristics, crystalline structures, and Raman investigations were carried out on (1-x) (Na0.5Bi0.5)TiO3-x NaNbO3 ceramics. X-ray diffraction (XRD) patterns showed that NaNbO3 c…
Magnesuim Manganese ferrite powders of Mg 0.9 Mn 0.1 Fe 2-x O 4 [x = 0.2, 0.4, 0.6, 0.8] compositions were synthesized by citrate precursor method at low temperature. The decomposition temperature, phase formation and microstructure were characterized by Thermogravimetrical Analysis (TGA), X-ray diffraction method (XR…
Architectural fabric, or tensile fabric, structural fabric has become popular over the last decades. The structural fabric is used for shading public areas such as airport, boat docks, sport areas, public bus stops, and car parking. The most important advantages of the architectural fabric structure are low weight and…
A busca por fibras poliméricas com diâmetros na ordem de nanômetros tem sido alvo dos pesquisadores e das indústrias, sendo que essas fibras possuem diversas aplicações. Estas fibras podem ser produzidas pelo processo de eletrofiação a partir da solução polimérica. Neste trabalho, fibras de nanocompósitos de poliamida…
Seven layered C 5 N configurations constructed from hexagonal BN and graphite structures are studied using an ab initio pseudopotential density functional method. The structural and electronic properties, and pressure-induced phase transition are investigated by calculating the total energy, structural parameter, form…
Almost isotropic three-dimensional multilayered composite right/left handed metamaterial structure is proposed and designed. It is composed of conductive mesh plates and dielectric layers including dielectric resonators with high dielectric constant. Basically, the structure has uniaxial anisotropy. The polarization o…
A novel magnetically controlled Ni-plating method has been developed to improve the field-emission properties of carbon nanotubes (CNTs). The effect of the magnetic field and Ni-electroplating on CNT field-emission properties was investigated, and the results are demonstrated using scanning electron microscopy, J—E an…
A closed four-level system in atomic vapour is proposed, which is made to possess left handedness by using the technique of quantum coherence. The density matrix method is utilized in view of the rotating-wave approximation and the effect of a local field in dense gas. The numerical simulation result shows that the ne…
Abstract Ultrananocrystalline Diamond (UNCD) Films were deposited by MW-CVD from an Ar/H2/CH4 plasma. The plasma properties were measured in situ by optical emission spectroscopy and mass spectroscopy. The intensity of the C2 emission line was systematically varied as a key plasma parameter and a correlation with resu…