Materials Literature
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Using analytical k · p calculations, we are able to describe the zone-center interband optical properties of Si [001] quantum wells in agreement with first principle calculations. Within the k · p band formalism, we understand how the sp*-like character of the conduction band minimum determines a total anisotropy of t…
Quality assurance of herbal products may be ensured by proper quality control of the herbal ingredients. In this regard, a rapid, precise, selective, and accurate high performance thin layer chromatographic method of analysis for the determination of ferulic acid in Hemidesmus indicus roots extract was developed and v…
Fresh Parkia biglobosa fruit pulp was evaluated in terms of its water absorption, foam and emulsion capacities, gelatinization temperature, moisture content, microbial count, swelling and solubility profiles. The Scanning Electron Microscopy (SEM) and Differential Scanning Calorimetry (DSC) were carried out for morpho…
The control of catalytic activity using molecular self-assembly is of fundamental interest. Recent experiments (Muller et al., Angew. Chem., Int. Ed., 2009, 48, 922-925) have demonstrated that two sequence isomers of β-peptides show remarkably different activity as an amine catalyst for a retro-aldol cleavage reaction…
Abstract Two fluorene and triphenyl pyridine‐based linear and dendronized copolymers, P1 and P2, were synthesized and fully characterized by 1H‐NMR, 13C‐NMR, and matrix assistant laser desorption/ionization time‐of‐flight mass spectra, respectively. The absorption, photoluminescence (PL) behavior, and energy band gaps…
We formulate an approximate thermodynamic theory of the phase transition in driven lattice gases with attractive nearest-neighbor interactions. We construct the van der Waals equation of state for a driven system where a nonequilibrium chemical potential can be expressed as a function of density and driving field. A M…
In this study, we reported a plasma method to generate the cold pulsed glow discharge for large-area surface modifications of various polymers, such as polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), and polytetrafluoroethylene (PTFE). The cold plasmas consisting of pulsed and glow-like breakd…
Strain-based forming limit diagrams (FLDs) are the traditional tool used to characterize the formability of materials for sheet metal forming processes. However, this failure criterion exhibits a significant strain path dependence. Alternatively, stress-based FLDs have been proposed and shown to be less sensitive to t…
We investigated the dynamics of current-pulse-induced magnetization switching in magnetic tunnel junctions (MTJs) with antiferromagnetically and ferromagnetically coupled synthetic free layers through micromagnetic simulations. We found that a magnetic vortex is formed in thick upper ferromagnetic layers and plays an…
Crystal growth from all three states of matter, i.e. vapour, liquid and solid, produces the dendritic morphology. A well known vapour case is the snowflake. Most liquid metal products solidify by forming dendrites. Crystal growth from an already crystalline matrix is also found to produce precipitates with a dendritic…
A new bisphenol monomer with pyridyl groups (compound 3) was synthesized via a two-step reaction. A series of functional poly(aryl ether ketone)s with pyridyl groups on the side chains (Py-PAEKs) were prepared by a nucleophilic substitution polycondensation of new bisphenol monomer, 2, 2-di(4-hydroxy phenyl)propane an…
Amorphous Cu50Zr40Ti10 powder was fabricated in the particle size range <50 μm by gas atomisation method. Gas atomised Cu50Zr40Ti10 amorphous powder exhibits the glass transition temperature Tg of 629·5 K and the crystallisation temperature Tx of 693·2 K respectively. The gas atomised Cu50Zr40Ti10 amorphous powder pos…
Using the recent NF (near-field) formulation for electrodynamics on the nanoscale, we simulate transport in a Y-shape gold nanostructure in the presence of 2-level molecules. NF is shown to be easily integrated with the Liouville equation, producing a simple and efficient nanopolaritons (plasmons-excitons) solver, wit…
By using the dielectric relaxation method, we studied molecular dynamics of α-tetralone. Our purpose was to reveal the molecular origin of secondary processes observed for this very simple-structured molecule. To this end, we carried out dielectric measurements at both ambient and elevated pressure of neat α-tetralone…
We have investigated the magnetic properties of B-site-ordered Sr2FeTaO6 double perovskite thin films grown on (111) SrTiO3 substrates by using pulsed-laser deposition. High degree of ordering of Fe and Ta ions has been confirmed using x-ray diffraction and atomically resolved high-angle annular dark-field scanning tr…
The processing and properties of chromium–molybdenum, powder metallurgy steels with admixed extra-fine nickel (XF Ni) were investigated. Prealloyed Fe–1·5Cr–0·2Mo powder was blended with different quantities of XF Ni, while a hybrid steel with lower Cr content was prepared by blending Fe–1·5Cr–0·2Mo and Fe–0·5Mo preal…
The natural radionuclide contents in some medicinal plants commonly found around oil and gas facilities in Ughelli and nearby communities have been investigated. A class of such medicinal plants are those that are regarded as grasses and are usually taken for healing purposes. The plants investigated are lemon grass (…
Efficient usage of laminated veneer lumber (LVL) in the construction industry requires an understanding the effects of the heat treatment process on the physical and mechanical properties of LVL. It is well known that the heat treatment is often used to improve the dimensional stability of solid wood, but it cases to…
We have developed tight-binding Hamiltonians for the hcp transition metals zinc and cadmium based on the Naval Research Laboratory tight-binding method. The Hamiltonians have a nonorthogonal basis and are derived by fitting to band structures and total energies of first-principles linearized augmented plane-wave calcu…
The objective of this research was to devise a means by which dispersoid forming transition metals could be incorporated into press and sinter aluminium powder metallurgy (P/M) alloys. Additions of iron and nickel were explored in this context added as either admixed elemental powders or prealloyed additions into the…