Materials Literature
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This work deals with 99Mo/99mTc generators produced from titanium 99Mo-molybdate, first synthesized and then irradiated. This method avoids the use of special equipment for the synthesis of radioactive material and reduces the process time which usually is at least 7 h. The effect of four parameters of titanium molybd…
The synthesis and characterisation of two new cyclen-based near IR-emitting lanthanide complexes is reported; the lanthanides are sensitised by rhodamine, which in turn is excited by energy transfer from a coumarin 2 moiety. The three lumophores function as an energy transfer cascade spanning the UV-visible-near IR re…
SPS consolidation of two ultrafine α-alumina powders (TM-alumina with 100nm and AA-alumina with 230nm) was examined under the two pressurizing conditions of 30MPa and 100MPa. It was found that densification behavior under 30MPa was influenced by the grain size of raw powder alumina and the influence of grain size on t…
The formation of raspberry particles from polyelectrolyte multilayer-modified particles is described. This synthesis represents a new use for polyelectrolyte multilayers as nanoscale-thick reaction vessels for the immobilization and reaction of inorganic reagents. The dissolution of Au nanoparticles inside PEM layers…
A series of unsymmetrical cyclen-based ligands incorporating an antenna and a quencher have been prepared for the complexation of the visible- (Eu, Tb) and near IR-emitting (Nd, Yb) lanthanides. Eu and Tb were sensitised with coumarin 2, and Nd and Yb with rhodamine. Both antennae were paired with nucleoside (uridine…
Increased environmental awareness and societal needs serve as a catalyst for developing new eco-friendly materials like green composites. In the recent past, researchers have reported the results of their studies on green composites of different plant fibres and various biodegradable matrices. This article is an overv…
Eight bis-bidentate Schiff-base ligands, derived from 3,6-diformylpyridazine and substituted amino-benzenes, have been prepared. A variety of electron donating/withdrawing and/or sterically demanding/undemanding substituents were employed. Two ligands and five of the six pure copper(I) complexes have been structurally…
Composites based on natural rubber (NR) and multiwall carbon nanotubes (MWNTs) were prepared by using different mixing processes. The state of dispersion was evaluated by transmission electron microscopy and the extent of reinforcement imparted to the elastomeric matrix was assessed by equilibrium stress–strain measur…
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…