Materials Literature
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Molecular dynamics computer simulations are used to investigate the dynamics of a binary mixture of charged (Yukawa) particles with a size ratio of 1 : 5. We find that the system undergoes a phase transition where the large particles crystallize while the small particles remain in a fluid-like (delocalized) phase. Upo…
Mesoporous materials have attracted a great deal of attention because of their controllable structures and compositions, which make them suitable for a wide range of applications in catalysis, environmental clean-up, and development of advanced materials. Various mesoporous materials can be synthesized based on the se…
In this paper the authors review various microscale and nanoscale thermal characterization techniques that could be applied to active and passive devices. Solid-state micro refrigerators on a chip can provide a uniform and localized temperature profile and they are used as a test vehicle in order to compare the resolu…
Ulyanovsk State University (UlGU) Nickel and copper were subject to severe plastic deformation at room temperature, using hydrostatic extrusion (HE) and equal-channel angular pressing (ECAP). The maximum deformation was 13.5 in nickel and 22.3 in copper. These deformations were obtained by each of the techniques separ…
Ferromagnetic (FM) manganites, a group of likely half-metallic oxides, are of special interest not only because they are a testing ground for the classical double-exchange interaction mechanism for the ‘colossal ’ magnetoresistance, but also because they exhibit an extraordinary arena of emergent phenomena. These emer…
Continuous gold layers of increasing thickness were prepared by the vacuum deposition method on pristine and plasma modified sheets of PE, PET and PTFE. Various surface profiles were obtained. The surface morphology was studied using atomic force microscopy (AFM). The continuity of the metal layer on the polymer surfa…
This paper describes the fabrication of a multipurpose table using banana trunk fibre-woven fabric-reinforced composite material. The aesthetic value coupled with strength and mechanical properties make banana trunk fibre-woven fabric-reinforced composites a suitable material for furniture making. Design and fabricati…
This study is to find a correlation between surface roughness and cutting tool vibration in turning. The ranges of process cutting parameters in the present study are limited: cutting speed (34, 70, 130 m/min), depth of cut (0.1, 0.2mm), feed rate (0.07, 0.13, 0.17mm/rev) and tool overhanging (25, 30, 35, 40mm). The d…
Calotropis procera (Ait.) R. Br., a widely used medicinal plant in Indian sub-continent, was investigated for endophytic mycoflora as a possible source of bioactive secondary metabolites. Four hundred seventy three segments from 9 plants of Calotropis procera, collected from different locations of Karachi University c…
This report is focused on a studying of single-walled carbon nanotubes (SWCNTs) by different microscopic methods. It is important for the number of researches to know basic parameters of SWCNTs, especially a diameter and length of one nanotube or a bundle of nanotubes and a number of nanotubes in the bundle. For deter…
The radar cross section (RCS) of a CAD model of the stealth bomber B-2 Spirit was simulated with the CADRCS software. Results from simulations with the aircraft model having a perfectly conducting surface and rotating about the yaw, pitch and roll axes are presented and compared with results of simulations where the s…
Metamaterials have been shown to revolution the control of electromagnetic waves in the microwave region showing unnatural phenomena such as negative refraction. Recently the freedom of design provided by metamaterials was exploited to design cloaking devices. In this work the author presents an alternative approach t…
We demonstrate that star-branched polyelectrolytes are a versatile soft component forming a variety of well-characterised conformations upon electrostatic complexation on oppositely charged planar surfaces. We discover and characterise five complexation shapes, described by a two-dimensional morphological order parame…
tion of some structural parts (plagioclase, magnetite, pyroxene) and due to the non-homogeneity of melt. Utilisation of the technology of continuous spinning overcomes the problem of unevenness and the resulting filament yarns are appli cable in the textile branch. It is possible to use these yarns for the production…
The reaction of 3,3,3',3'-tetramethyl-5,5',6,6'-tetrahydroxy-1,1'spiro-bis(indane), L, with cobalt salts in the presence of diazine ligands affords polymeric derivatives of general formula [CoL(diazine)]infinity . nH2O, L being coordinated as a mixed-valence SQ-Cat species. The bipiridyl and o-phenantroline derivative…
Despite significant scientific interest, there are currently no widely accepted methods for the production or shortening of CNT that offer fine control over CNT length distribution. This paper reports the production of shortened double walled carbon nanotubes (DWNT) by high-energy ball milling and their characterisati…
Magnetic behavior of polymer-based scanners is studied in detail with emphasis on a new magnetic actuator model and dc deflection experiments. A 30-$\mu$m-thick permalloy sheet is plated on a polymer cantilever scanner and actuated using an external coil. Mechanical and magnetic modeling of the device and experimental…
Manufacturing of lightweight structures from fiber-reinforced thermoplastic composites is of great benefit. Among various manufacturing methods the usage of semi-finished products is in high demand. To improve the mechanical properties and increase the productivity, the commingled hybrid yarn was developed recently. A…
A two-dimensional numerical model of a single-chamber solid oxide fuel cell ͑SCFC͒ operating on hydrocarbon fuels is developed.The SCFC concept is a simplification of a conventional solid oxide fuel cell in which the anode and cathode are both exposed to the same premixed fuel-air mixture, and selective catalysts prom…
Polymethylated poly(diphenylacetylene) derivatives, a new category of substituted polyacetylenes, were successfully synthesized, and proved to show extremely high gas permeability.