Materials Literature
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A 3D computer modeling and simulation has been used to predict crystallization kinetics and crystal morphology in polymers under the non-isothermal condition. A parametric study is used to explore the influences of thermal conditions on the crystallization. The results indicate that cooling rate has a strong impact on…
In this paper, we present the design and development of a magnetic resonance imaging (MRI)-compatible tendon-driven robot to overcome the limitations of our previous minimally invasive neurosurgical intracranaial robot (MINIR). In this prototype, the robot is made of plastic and the MRI-compatible shape memory alloy (…
Polycrystalline samples of degenerate n-type KxBa8−xZnyGe46−y (y∼8-x/2) with the type-I clathrate structure (No. 223, Pm3¯n) were prepared by powder metallurgy to obtain a high-efficiency Ge-based clathrate. Their Zn atoms preferred to exist at the 6c site in the framework, and consequently, the samples with x around…
Citrate-nitrate method was used to synthesize (Fe,Co)/MgO-Al 2 O 3 , (Fe,Mo)/MgO-Al 2 O 3 , and (CoMo)/MgO-Al 2 O 3 catalysts for production of carbon nanotubes. Multi-walled nanotubes were formed on these catalysts by catalytic pyrolysis of a propane-butane mixture.
The potentials of dynamic extraction in rotating coiled columns ( RCCs ) for the speciation analysis of soils, sludges, and bottom sediments is discussed on an example of the fractionation of element forms. A comparative study of the results of the fractionation of the forms of heavy metals differing in physicochemica…
Metal sorption on carbon plays an important role in a range of applications, including batteries, supercapacitors, and nuclear reactors. In particular, understanding sorption of radioactive isotopes, such as Cs and Sr in different graphite materials, is important for establishing nuclear reactor safety. This work uses…
Regarding the increasing interest in underground transmission systems, gas-insulated lines (GIL) represent an attractive alternative to cable solutions. Changes in the regulatory framework with respect to planned extensions of extra high voltage (EHV) systems have intensified the demand for underground transmission li…
The effect of the microstructure of titanium dioxide on the structure, thermal stability, and catalytic properties of supported CuO/TiO 2 and CuO/(CeO 2 -TiO 2 ) catalysts in CO oxidation was studied. The formation of a nanocrystalline structure was found in the CuO/TiO 2 catalysts calcined at 500°C. This nanocrystall…
The electric field (E-field) distribution on transmission line composite insulators is one of the primary factors impacting its long term performance. This panel session paper will present the expected E-field distributions on composite insulators in-service as well as the resulting aging and degradation modes if the…
Abstract Salt leaching technique has been employed to produce polycaprolactone (PCL) based porous tubular matrix. Salt was dispersed into PCL solution in chloroform and the subsequent leaching of salt was accomplished in water. The effect of salt and polymer concentration on the mechanical properties, porosity and sur…
The accumulation of fly ash leads to severe problems in ecological environments. Various ways to excite the activity of fly ash in Portland cement based cementitious materials have been carried out for many years. In the present study, effect of large volume of fly ash in phosphate cement was studied. Dead burned magn…
CONTEXT: Remelting previously cast base metal alloy can adversely affect the mechanical properties of the alloy and necessitates addition of new alloy. AIMS: To study the effect of remelting different combinations of new and used cobalt-chromium (Co-Cr) alloy on its mechanical properties and microstructure. MATERIALS…
Vorlanite, cubic CaUO 4 heated at temperatures above 750 °C, transforms irreversibly into rhombohedral CaUO 4 , proving that the latter crystallized as a precursor of vorlanite in high-temperature skarns, Vorlanite most probably originated due to pseudomorphic transformation of rhombohedral CaUO 4 , caused by disorder…
The present paper reports on the preparation and analysis of LiNbO3 (LN) ceramic powder by a conventional chemical co-precipitation method. An aqueous mixture of ammonium carbonate along with ammonium hydroxide has been used. Lithium niobate ceramic powders have been sintered at 600, 700, 800, 900 and 1000°C, respecti…
Recently, hybrid cache architecture has become illuminated. As heterogeneous memory dies are stacked, it improves the performance of microprocessor enhanced in terms of power consumption and processing speed. This paper analyzed the hybrid cache architecture using different programs and memory types. SRAM is fixed for…
The magneto-acoustic behavior of the rare-earth multiferroic Nd0.75Dy0.25Fe3(BO3)4 in external magnetic fields lying in the basal plane of the crystal is studied. The data confirm the existence of a magnetic anisotropy in this plane and of magnetic phase transitions in the crystal caused by this anisotropy. H-T phase…
Silicon, boron, and zirconium boride coatings on graphite have been obtained by thermal treatment of the initial components in air. During the course of the chemical reactions, a glass melt encapsulating (wrapping) the initial particles is formed, which makes it possible to create an air barrier preventing the diffusi…
Pyrrole was polymerized in the presence of anhydrous ferric chloride as oxidant and p-toluene sulphonic acid as dopant. Polypyrrole-coated short Nylon fibers were prepared by polymerizing pyrrole in the presence of short Nylon fibers. The resultant polypyrrole (PPy) and polypyrrole-coated Nylon fiber (F-PPy) were char…
The utilization of radio-frequency (RF) superimposed direct-current (DC) magnetron sputtering deposition on the properties of gallium doped ZnO (GZO) based transparent conducting oxides has been examined. The GZO films were deposited using 76.2 mm diameter ZnO:Ga2O3 (5 at. % Ga vs. Zn) ceramic oxide target on heated n…
A novel method for preparing fine magnetite nanoparticles without using any additives and organic solvents has been developed. In this method, a sequential precipitates formation method, ferrous and ferric hydroxides are not coprecipitated but sequentially formed in an alkaline solution, and then the resulting suspens…