Materials Literature
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Gamma radiation levels at the well heads in the Nigerian Petroleum Development Company Oil Field located at Ologbo in Edo State of Nigeria have been investigated using a Digilert 50 Radiation Geiger Muller Counter. The sites investigated include one heavy crude oil producing well (A), one light crude producing well (B…
This paper presents a multidimensional extension of the Schur-Cohn algorithm for testing BIBO stability in N variables. This new method only needs a unique condition to be checked, as an alternative to the set of conditions of the well-known Huang-Jury-Anderson stability test. The proposed algorithm is based on a gene…
Arylhydrazones were linked onto gold nanoparticles through the poly(ethylene glycol) spacer to produce a new type of photoinduced DNA-cleaving nanomaterials with great potency.
The synthesis is described for a small series of oligomers built from (2, 3, 4 or 6) ethynyl-naphthalene repeat units and end-capped with solubilising 1,2,3-tris-dodecyloxy-benzene groups. These compounds absorb in the near-UV region and exhibit strong fluorescence in both fluid solution and a glassy matrix at 77 K. T…
The electronic energy loss of swift H and He ions in gold is studied, paying special attention to the contribution to the projectile energy loss due to the ionization of the target inner-shells. We calculate the stopping power and the energy-loss straggling as a function of the projectile energy, taking into account t…
The reaction of boehmite with diethyl phosphoric acid generated in situ in a boiling water solution of triethyl phosphate has been studied in detail. Two kinds of solid products have been isolated and characterized by elemental and XPS analysis, in addition to XRD, TGA, FT-IR, SEM, and MAS NMR techniques. One of them…
alpha-sheet has been proposed as the main constituent of the prefibrillar intermediate during amyloid formation. Here the helical parameters of the alpha-sheet strand are calculated from average main-chain dihedral angles reported from molecular dynamics simulations. It is an almost linear polypeptide that forms a rig…
We investigate the tunneling escape of confined excitons in CdSe core-shell quantum dots by means of the time-dependent Schrodinger equation. Our results indicate that obtaining efficient charge extraction strongly depends on the interplay between parameters such as nanocrystal sizes, shell thicknesses, external elect…
The crystallization of macromolecules as an intermediate in the production of protein structures is often the rate-limiting factor. Achievements in the field of protein crystallization such as automation, availability of commercial crystallization kits, the application of developments in nanotechnology, and informatio…
Plants encode the bifunctional dehydroquinase-shikimate dehydrogenase (DHQ-SDH), which catalyzes the third and fourth steps of the shikimate pathway. We report the Arabidopsis thaliana DHQ-SDH structure in complex with all of its natural substrates. The DHQ-SDH enzyme was first cocrystallized with shikimate. NADP + wa…
Polyurethane flexible foam having shape memory effects has been synthesized from polyester polyol and 4,4'-diphenylmethane diisocyanate (MDI) following the quasi-prepolymer method in the presence of water as the blowing agent, and the effect of the organometallic catalyst and the molecular weight of polyol has been st…
Abstract We present a novel method of controlling the specular and diffuse reflection of light by the electrostatic deposition of a spherical particle monolayer followed by electroless plating. Charged polystyrene colloidal particles, ranging in size from 100 nm to 5 μm, were adsorbed from solution onto oppositely cha…
A general approach toward amphiphilic systems bearing multimetallic clusters and their ability to form Langmuir-Blodgett films is presented. The synthetic strategy to stabilize these clusters involves the use of a ligand (HL) containing an N(2)O-donor set and long octadecanoic chains to obtain the carboxylate-supporte…
The magnetoelectric (ME) coupling from 20 Hz to 100 kHz and the hydrogen effect on Ni–PZT–Ni trilayer composites made by electrodeposition have been investigated. The results show that the magnetoelectric voltage coefficient, α E ,31 , increases with increased Ni layer thickness, up to α E ,31 = 16 V cm −1 Oe −1 . The…
The molecular behavior of silicon nanoparticles, produced via electrochemical etching of a bulk precursor, is studied. The smallest particle, $1\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ in diameter, is amenable to first principles modeling due to the manageable number of atoms in the structure. The ability to produce th…
A recently introduced particle-based model for fluid dynamics with continuous velocities is generalized to model immiscible binary mixtures. Excluded-volume interactions between the two components are modeled by stochastic multiparticle collisions which depend on the local velocities and densities. Momentum and energy…
Thin films of iron cobalt oxides with spinel-type structure are made by the atomic layer deposition (ALD) technique using Fe(thd)3 (Hthd = 2,2,6,6-tetramethylheptane-3,5-dione), Co(thd)2, and ozone as precursors. Pulse parameters for ALD-type growth are established and such growth can be achieved at deposition tempera…
Abstract In this study, multiwalled carbon nanotubes (MWNTs) were purified by using chemical method with different proportion of nitric acid and sulfuric acid liquid phase mixture. Carboxyl groups and other functional groups could be modified on the MWNTs surface. However, oxidation can damage the structure of carbon…
An investigation of the sensitivity of magnetic Barkhausen noise (MBN) to changes in uniaxial tensile stress applied to mild steel under conditions of low, medium, and high excitation field amplitudes is presented. Field excitation in the lowest range that was tested produced the most sensitive response to change in s…
We propose a hierarchical multiscale approach to modeling of high-frequency phenomena in power transformers. The method is based on considering high-frequency effects on two spatial levels. Part I of the paper focuses on a small-scale level where eddy-current as well as geometrical and proximity effects in conductors…