Materials Literature
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Direct observation of the defect formation in carbon nanostructures during electron irradiation is carried out by high‐resolution transmission electron microscopy (HR‐TEM) on the double‐wall carbon nanotubes (DWNT) and carbon nanopeapods. The irradiation damage due to the knock‐on collision with high energy electron b…
At the composition of Ti4040Zr4040Ni2020 , a single_phase cylindr ical quasicrystalline alloy, 3mm in diameter and 15mm in length, can be fabr icated by a copper-mold casting method. Its quasicrystalline nature and structu ral homogeneity were confirmed by x_ray diffraction and transmission electron mi croscopy. Accor…
The structure of high-silica porous glasses and quartz-like (Vycor type) glasses has been investigated by transmission and scanning electron microscopy and by electron micro-probe analysis. Porous glasses (PGs) have been manufactured by acid leaching of phase-separated alkali borosilicate glass plates. To obtain the q…
(ARTYKUŁ ZAMAWIANY) Ceramic matrix composites (CMCs) are non-brittle structural ceramics for application at high temperatures. They consist of ceramic fibers embedded in a ceramic matrix, the fiber/matrix bonding being controlled through weak enough interphase. CMCs are processed following gas, liquid or powder routes…
The connection between the external and internal direct magnetic field intensities in an ellipsoidal magnetic insulator in a uniform field is a classic result in the literature. It is usually stated in terms of shape demagnetising factors. The case of the non-ellipsoidal geometry in a uniform field has been dealt with…
Three polycrystalline bismuth-containing layered perovskite-like oxides are synthesized by high-temperature solid-state reactions. One of these compounds was described previously, namely, Bi 3 Ti 1.5 W 0.5 O 9 , for which the unit cell parameters a = 5.372(5) Å, b = 5.404(4) Å, and c = 24.95(2) Å are determined in thi…
Microalloyed cast steels are a group of microalloyed steels, in which reliable mechanical properties could be achieved by heat treatment. In addition, Thermochemical data indicate that Zr has high affinity for oxygen, nitrogen and carbon.The aim of present work was to investigate on the role of Zr, as a microalloying…
Copper and silver oxide share the rather unusual cuprite structure, formed by two interpenetrating networks of corner-sharing M 4 O tetrahedra ( M = Cu, Ag). Negative thermal expansion of the cell parameter has been observed from 5 to about 200 K for Cu 2 O and up to 470 K for Ag 2 O by powder diffraction. In the case…
MCM‐41 and MCM‐48 were functionalized with cobalt by two methods, incipient wetness impregnation and co‐precipitation, and were characterized by XRD, N2‐sorption, and TPR. The incipient wetness impregnation method provides a high dispersion of small cobalt oxide particles, while the mesoporous structure and high surfa…
Terbium-doped nanocrystalline yttrium aluminium garnet phases, Y3Al5O12:Tb 3+ (YAG:Tb 3+ ), were obtained by using rare-earth nitrates as the starting materials, together with citric acid and ethylene glycol according to the Pechini method. Thermogravimetric and differential thermal analysis were used to study the the…
Relationships between singularly perturbed equations and equations with hysteresis are discussed. 1.1 Introduction 1.1.1 Stop and Play nonlinearities Singular perturbations (including time relaxation) and hysteresis phenomena are among the most common strongly nonlinear elements which arise in almost any industrial, p…
Thermal conductivity is an important material property of the bulk thermoelectrics. To improve ZT a reduced thermal conductivity is always desired. However, there is no standard material for thermoelectrics and the test results, even on the same material, often show significant scatter. The scatter in thermal conducti…
Closed form analytic approximations are proposed for complex impedance (capacitance and Q-factor) of capacitors formed by two coplanar rectangular conducting patches sandwiched between dielectric layers. The computations using proposed formulas are at least an order of magnitude faster in comparison with the commercia…
The temperature dependence of the relaxation of poly(aniline) (Pani) and poly (o-toluidine) (POT) in aqueous eutectics of and in the temperature range K, was investigated. As the temperature decreased the anodic peak parameters, increased, increased, and decreased. The data is interpreted qualitatively within the fram…
Abstract Crystals of nominal composition Ca(Nb 0.8 Ti 0.2 )O 3.4 , an n = 5 member of the homologous series A n B n O 3n+2 , have been synthesized by floating-zone melting. The material was found to be multiphase consisting also of the n = 6 type. A good single crystal of this n = 6 type was found and the crystal stru…
The synthesis and characterization of a water-soluble biodegradable multiblock polyurethane based on poly(ethylene glycol) blocks interconnected by a pentapeptide derivative N , N' -bis(aspartylprolyl)lysine is described. The pentapeptide linkages are susceptible both to chemical hydrolysis in neutral and mild acid me…
Well-defined CoFe2O4 nanoparticles embedded in amorphous SiO2 matrix have been synthesized by sol-gel method, characterized and investigated by Mossbauer spectroscopy and magnetic measurements. The mean particle size was found to increase from 3 to 15 nm by varying the temperature of a subsequent annealing from 800 to…
Abstract This article describes the processes involved in the production of hafnium and its alloys. It discusses the physical, mechanical and chemical properties of hafnium. The aqueous corrosion testing of hafnium and its alloys is detailed. The article reviews the corrosion resistance of hafnium in specific media, n…
Abstract Infrared (IR) spectroscopy has been used for routine characterization and identification of clay minerals for many years (Stubican and Roy, 1961; Farmer and Russell, 1964; Farmer, 1974; 1979; Hawthorne, 1988; Russell and Fraser, 1994; Johnston and Wang, 2002; Madejová and Komadel, 2001; Schroeder, 2002). Most…
Abstract: Mathematical modelling of austenite decomposition has been investigated. Phase portion in steel are predict based on hardenability curve of Jominy-specimen. The kinetic of phase transformations and hardness distribution have been estimated based on time relevant for structure transformation. The designed inv…