Materials Literature
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The electronic structure and elastic properties of the 4d transition metal carbides MC (M = Y, Zr, Nb, Rh) were studied by means of extended Huckel tight-binding band electronic structure calculations. As the valence electron population of M increases, the bulk modulus of the MC compounds in the rocksalt structure doe…
Layered $Li_{1.2}(Fe_{0.16}Mn_{0.32}Ni_{0.32})O_2$ was prepared by the mixed hydroxide method at various temperatures. Xray diffraction (XRD) pattern shows that this material has a ${\alpha}-NaFeO_2$ layered structure with $R{\bar{3}}m$ space group and that cation mixing is reduced with increasing synthesis temperatur…
A novel hybrid active power filter (NHAPF) that can be adopted in high-voltage systems is proposed in this paper. The topological structure and filtering principle of the compensating system is provided and analyzed, respectively. Different controlling strategies are also presented to select the suitable strategy for…
This paper discusses electro-migration behavior of eutectic Sn-Bi solder with Cu-pillar bumps. Two types of under bump metal (UBM) of organic substrate were studied, that is, Cu pad and electroless Ni/Au plated on Cu pad. The current density was 4x104A/cm2 at 125 and 150 degree C. Bi quickly migrated to accumulate on…
A vibrant iron and steel sector is necessary for the infrastructural and technological development of any nation. Nigeria is blessed with all the raw materials required for steel development including iron ore, coal, natural gas and limestone. At the third national development plan (1975 -1980) specifically between 19…
The tribological properties of glass fiber reinforced polyamide 6 (GF/PA6, 15/85 by weight) and its composites filled with solid lubricants were investigated. The main purposes of this article were to study the hybrid effect of solid lubricants with glass fiber as well as the synergism of combined solid lubricants, th…
A novel multi-cationic borane, tri-N-methylpyridinium substituted triarylborane, $[BAr^N_3]I_3$ ( $[2]I_3$ ) ( $Ar^N=4-(4-C_5H_4N-Me)-2,6-Me_2-C_6H_2$ ) was prepared from the corresponding neutral tris-pyridyl borane, $BAr_3$ (2a) ( $Ar=4-(4-C_5H_4N)-2,6-Me_2-C_6H_2$ ). The crystal structure of 2a determined by X-ray…
to-pology, PhotoluminescentInvestigations into coordination polymers remain intense-ly active not only because of their diverse topology andintriguing structures but also because of their potential ap-plications in many fields, such as ion-exchange, heterogene-ous catalysts, optical devices, magnets, and gas storage.
This paper deals with the optimum design of the stator and rotor shape of the interior permanent magnet synchronous motors (IPMSM) that are used in applications for automobiles. IPMSMs have the following advantages: high power, high torque, high efficiency, etc. However, cogging torque which causes noise and vibration…
Background: Fixed bed adsorber as a controlling method for volatile organic compounds is widely used. However, these adsorbers are facing some issues such as high pressure drop, non-uniformed distribution of fluid, channeling and blockage. Fluidized bed adsorber as a novel method solves lots of these limitations. Obje…
The influence of Cu doping on electrophysical, structural and gas sensing properties of the SnO2 films deposited by spray pyrolysis was considered in this paper. It was shown that the addition of Cu in SnO2 even in small concentrations was accompanied by strong changes in the SnO2-based gas sensors performances. The r…
Abstract Continued reduction in feature dimension in integrated circuits demands high degree of flatness after chemical mechanical polishing. Here we report using new yttrium oxide (Y2O3) nanosheets as slurry abrasives for chemical-mechanical planarization (CMP) of copper. Results showed that the global planarization…
In CASP10, for the first time, contact-assisted structure predictions have been assessed. Sets of pairs of contacting residues from target structures were provided to predictors for a second round of prediction after the initial round in which they were given only sequences. The objective of the experiment was to meas…
ABSTRACT Indentation is a relatively simple and virtually nondestructive technique of assessing mechanical properties of materials by an indenter inducing localized deformation into a solid surface. The load–displacement curves, the hardness, and the elastic modulus data together with associated analysis for poly(ethe…
Synthesis and ion conduction studies on SiO2 dispersed hot-pressed sodium ion conducting nano-composite polymer electrolytes (100 − x)[70PEO:30NaHCO3] + xSiO2, where x is in wt.%, are reported. The nano-composite polymer electrolytes (NCPEs) are cast by the dispersion of nano-filler SiO2 using a hot-press method in pl…
Two new high-nitrogen energetic compounds $ZTO{\cdot}2H_2O$ and $ZTO(phen){\cdot}H_2O$ have been synthesized (where ZTO = 4,4-azo-1,2,4-triazol-5-one and phen = 1,10-phenanthroline). The crystal structure, elemental analysis and IR spectroscopy are presented. Compound 1 $ZTO{\cdot}2H_2O$ crystallizes in the orthorhomb…
In this article Fischer–Tropsch (FT) synthesis was studied over cobalt nanoparticles supported on modified Montmorillonite (Zr-PILC). Co-loaded/Zr-PILC catalysts were synthesized by hydrothermal methods and were characterized by XRD, XRF, BET, H 2 -TPR, TGA and SEM techniques. FT reactions were carried out in fixed be…
ABSTRACT Variant concentrations of ceramic fibers (CerFs) were incorporated into acrylonitrile butadiene rubber (NBR) to fabricate elastomeric ablative composites for ultrahigh temperature applications. The CerFs introduction into the polymer matrix has enhanced the ablation resistance up to 59% and successfully reduc…
Azo-dyes, molecules characterised by the presence of the azo-group (–NN–), are widely used in textile, leather, rubber, plastic, and food industries. Water-soluble azo-dyes are greatly resistant to biodegradation, and are characterised by a high thermal and photo stability due to their complex structures. The release…
This paper discusses the design of a novel synchronous reference frame (SRF) method that can extract the reference compensating current for single-phase shunt active power filters (APFs). Unlike previous SRF studies, the proposed method has an innovative feature that does not require a fictitious current signal. Other…