Materials Literature
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Data are presented on the phase relations in the Zn 2 P 2 O 7 -M 2 ZnP 2 O 7 and M′ 2 ZnP 2 O 7 -M″ 2 ZnP 2 O 7 (M, M′, M″ = Li, Na, K) systems. The stable and metastable phase equilibria in these systems have been investigated, new compounds have been identified, and wide solid-solution ranges have been found. Some o…
The effect of the chemical composition and structural and morphological features of Fe and Fe 87 Si 13 powders milled in an inert atmosphere of Ar and a 3% solution of oleic acid in heptane (H + OA) on the magnetostatic and microwave properties has been studied in this work. Irrespective of the milling medium, all the…
A simplified mathematical model to predict the cutting behaviour of textile fabrics has been developed. It has been tried to identify the forces involved in cutting a material with a reciprocating knife and also to derive an expression for the sliding distance, which is a measure of the cut resistance of the material.…
Statistical analysis of the literature data on the structural and ferroelectric properties of ABi 2 B 2 O 9 layered perovskite-like compounds shows that these ferroelectrics can be divided into two distinct groups, one constituted by tetragonal and nearly tetragonal compounds, and the other by compounds with a signifi…
In this work the development of a system of micro-alloyed Mg–Ag–Ca–Mn–(Zr) alloys is described. It involves grain refinement throughout the production chain of direct chill casting and extrusion. After extrusion the alloys reveal a homogeneous microstructure and a fine grain size of less than 10 μm. At room temperatur…
In this study, the Ba(Zr0.1Ti0.9)O3 (BZ1T9) thin films have been well deposited on the Pt/Ti/SiO2/Si substrate. The optimum radio frequency (RF) deposition parameters are developed, and the BZ1T9 thin films deposition at the optimum parameters have the maximum capacitance and dielectric constant of 4.4 nF and 190. As…
This paper describes a fabrication process to integrate different types of energy-converting microelectromechanical system (MEMS) devices for a power generator. MEMS structures and a fabrication process for the monolithic integration are proposed for the purpose of accumulating small amounts of energy from various sur…
We fabricated Eu 2+ -doped ZnO microstructures by thermal evaporation. Their structures were micrometer-size grains with smooth surfaces or nanometer-size needles. Morphology depended on the temperature region where structures were grown. A strong green luminescence at room temperature is demonstrated. This is attribu…
A liquid metal (LM) consisting of one-third weight fraction each of Pb, Sn, and Bi has been investigated as the bonding substance in place of He in the pellet-cladding gap of light water reactor fuel elements. The LM bond eliminates the large ΔT over the preclosure gap that is characteristic of helium-bonded fuel elem…
The adsorption of an EAK 16-II oligopeptide sequence in aqueous medium onto functionalized quartz surfaces has been studied by using force field calculations and molecular dynamics methods. Two different surfaces have been simulated respectively involving fully methylated and fully silanolic quartz surfaces. Geometry…
A new chemical process to synthesize pure ZnO nanocrystal colloidal for bioimaging applications is reported. Zinc acetate dihydrate was dissolved and refluxed in a methanol solution at a low temperature (68degC) and ambient environment. Biocompatible surface capping agents were introduced to the synthesis process to c…
Three photosensitizers based on tris-(pentafluorophenyl)antimony corroles that differ in oxidation state and axial ligands, namely, (pyridine) Sb (III)-, (oxo) Sb (V)- and (difluoro) Sb (V) complexes, were studied by time-resolved electron paramagnetic resonance spectroscopy and laser flash photolysis. The magnetic an…
Irradiation is increasingly used nowadays to tailor the mechanical and electronic properties of carbon nanotubes. As the complete understanding of the response of nanotubes to irradiation is still lacking, we have implemented the kinetic Monte Carlo method with Bortz-Kalos-Lebowitz–algorithm in a simulation code which…
It has clearly been shown in the literature that the properties achieved by polymer clay nanocomposites are often related to their structures and to the states of dispersion of the silicate platelets in the polymer matrices. Unfortunately, up to date most techniques used in a standard procedure do not allow a correct…
The detection and localisation of Partial Discharge (PD) activities is gaining importance in maintaining operational transformers and diagnosing those which are faulty. Ultra-high-frequency (UHF) techniques have been applied successfully to detection of PD activities in HV transformers because of their sensitivity to…
Este trabalho avalia a utilização da cinza da casca de arroz como carga estrutural em poliamida 6 e poliamida 6.6. Estas matrizes poliméricas são importantes plásticos de engenharia com aplicações em várias áreas. Fez-se uma comparação das propriedades mecânicas de resistência à tração, resistência à flexão, resistênc…
A new cross‐linkable waterborne siloxane‐polyurethane dispersion (PEDA‐SiPU) was synthesized by incorporating the acrylate groups into the side chain of the polyurethane using the pentaerythritol diacrylate(PEDA) and introducing polysiloxane groups into the soft segment of the polyurethane using dihydroxybutyl‐termina…
Modern experimental studies of the temperature evolution at the surface of plastically deformed metals show that processes of energy accumulation and dissipation in the material are nonlinear even in the quasi-static case and obviously depend on the loading conditions as well as past history of deformation. Considerab…
Large single crystals of rubidium nickel hexahydrate Rb2Ni(SO4)2 · 6H2O (RNSH) of optical quality were grown for the first time. The atomic structure of RNSH crystals was refined. A comparative analysis of the crystal structures of (M 1+)2Ni(SO4)2 · 6H2O, where M 1+ is K, Rb, or Cs, was performed. The solubility curve…
Mollusc shell formation requires calcium (Ca ) and bicarbonate (CO3 −) ions, transported through the mantle via the hemolymph, and the secretion of an organic matrix that interacts with the mineral ions to form either the aragonite or calcite polymorph of calcium carbonate (CaCO3). The biomineralization process takes…