Materials Literature
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Summary A star shaped polystyrene‐ block ‐polybutadiene‐ block ‐polystyrene (SBS) block copolymer was subjected to epoxidation reaction using different reagents such as m ‐chloroperoxy benzoic acid (MCPBA), peracetic acid (PAA), performic acid (PFA) and hexaflouro‐isopropanol (HFIP). All the methods led to the targete…
Abstract The reaction of a series of compounds, Ar 3 Ge-MR 3 , 1 – 4 (Ar=Ph, p -Tol, M =Si, Ge, R=Ph, Me, tBu), with one equivalent of trifluoromethanesulfonic acid (HOTf) was investigated. The corresponding triflates were isolated in several cases. The molecular structure of Ph 3 Ge-GePh 2 OTf ( 5 ) in solid state wa…
Molecular dynamics simulations and a stochastic method based on the Fokker-Planck equation are used to explore the consequences of inhomogeneous density profiles on the thermodynamic and dynamic properties of the hard-sphere fluid and supercooled liquid water. Effects of the inhomogeneity length scale are systematical…
Radon levels and radioactivity were measured in 50 shops and storage areas for building materials in Sudan. Charcoal canister and gamma spectrometry systems were used to measure radon in 55 types of natural material, and concentrations of 71–292 Bq/m3 (mean, 154 ± 38 Bq/m3) were found. The concentration of radium (226…
A novel ironless synchronous permanent magnet linear motor with Halbach array is proposed. The operation principle and structure of this linear motor are introduced. Based on magnetic vector potential equation and boundary conditions, flux density distribution induced by the permanent magnet array is analysed analytic…
Abstract A new type of smart borinic acid polymer with luminescence and multiple stimuli‐responsive properties is reported. In DMSO with small amounts of water, the homopolymer PBA shows a tunable upper critical solution temperature (UCST). As the amount of water increases from 0 to 2.5 % (v/v), the UCST rises linearl…
The plating quality effect of manihot esculenta c. (cassava) leaf extract as addition agent on the electroplating of zinc on mild steel in acid chloride solution was investigated in the laboratory. The experiments were performed using different extract additive concentrations, different plating time and fixed pH condi…
Organic solar cells are being intensively developed in many laboratories around the world. This work has resulted in a rapid increase in the efficiency of organic solar cells; record figures of 10–12% were achieved in 2011–2013. This review focuses on one of the most promising groups of conjugated polymers: those cont…
CoMo/Al 2 O 3 sulfide catalysts varying in preparation method and Co/Mo ratio have been tested in the hydrorefining of a mixture of straight-run diesel fraction and rapeseed oil in a flow reactor at a temperature of 340–360°C, a hydrogen pressure of 4.0–7.0 MPa, and a liquid hourly space velocity of 1–2 h −1 . A compa…
This paper presents a methodology to obtain the parameters of the equivalent circuit for induction motor from nameplate and manufacturer catalog data sheet information. The proposed method is straight and non-iterative. The variation of rotor parameters for deep bars or double cage rotors is modeled and presented as a…
The effect of monosodium glutamate (MSG) on zinc electrodeposition from acidic sulphate plating baths was investigated using potentiodynamic cathodic polarisation, cyclic voltammetry, cathodic current efficiency and throwing power measurements, current–time transients and in-situ anodic linear stripping voltammetry te…
The topically applied drugs as drops are washed off from the eye in very short period, resulting in low ocular bioavailability of drugs. Number of approaches have been attempted to increase the bioavailability and the duration of action of ocular drugs. This review provides an insight into various novel approaches; hy…
A technique for the calculation of high-order virial coefficients, which combines the quadrature integration and the Mayer sampling Monte Carlo method (MSMC), is proposed. Unlike the original MSMC, this technique does not require to know the reference coefficients for the hard-sphere potential and can be used in a wid…
Submerged friction stir processing (SFSP) is a novel severe plastic deformation technique conducted underwater, which has great potential in preparation of fine-grained materials. In this study, AZ31 magnesium alloy is subjected to FSP in air (NFSP) and underwater at a fixed processing speed (60 mm min−1) and various…
Electrically driven rapid vaporization of thin metallic foils can generate a high pressure which can be used to launch flyers at high velocities. Recently, vaporizing foil actuators have been applied toward a variety of impulse-based metal working operations. In order to exercise control over this useful tool, it is i…
The objective of this work is to study the influence of pyrolysis temperature on structural, surface morphology and gas sensing properties of the nanostructured SnO2 thin films prepared by spray pyrolysis technique. These films were characterized for the structural, morphological and elemental composition carried by m…
Despite the numerous advantages of planar transmitarray antennas over conventional lens antennas, transmitarrays have a narrow bandwidth. The goal of this paper is to present a design methodology for improving the bandwidth of transmitarray antennas through control of the transmission phase range of the transmitarray…
We consider model problems for the tear film over multiple blink cycles with heat transfer from the posterior side of the tear film. A nonlinear partial differential equation governs the film thickness on a moving domain in one space dimension and time. One end of the tear film moves in order to mimic blinking in the…
The aim of this study was to enhance the production of vitamin K2 by using N-methyl-N-nitro-N-nitroso-guanidine (NTG) and low energy ion beam implantation and optimizing the fermentation medium. Mutation resulted in 1.66-fold higher production of vitamin K2 than that of the parentl strain. The production by the mutant…
In the present paper, through the calculation based on Powers theories and models and the phase analyses by XRD, SEM and EDAX, the phase composition and microstructure of hardened cement asphalt pastes were studied. The results showed that the phase composition and microstructure of hardened cement asphalt pastes are…