Materials Literature
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We introduce a new implementation of the finite-difference time-domain (FDTD) algorithm with recursive convolution (RC) for first-order Drude metals. We implemented RC for both Maxwell's equations for light polarized in the plane of incidence (TM mode) and the wave equation for light polarized normal to the plane of i…
Superlenses based on metamaterials are promising candidates for achieving subwavelength resolution. We report here our experimental studies on super-resolution imaging from one-dimensional (1D) negative index metamaterial superlenses at microwave frequencies. The metamaterial structure under investigation is shown to…
We have observed homogeneous crystal nucleation in Lennard-Jones liquid by molecular dynamics simulations. A clear nucleation time delay has been observed at $T=0.677{T}_{m}$ and $T=0.629{T}_{m}$ indicating the presence of a barrier, in contrast to recent reports [Trudu et al., Phys. Rev. Lett. 97, 105701 (2006)]. The…
In several archaea of the Euryarchaeota, the glycolytic flux proceeds through a modified version of the Embden-Meyerhof pathway, where the phosphofructokinase and glucokinase enzymes use ADP as the phosphoryl donor. These enzymes are homologous to each other. In the hyperthermophilic methanogenic archaeon Methanocaldo…
Nanocomposite Sm(2)Co(17)-5 wt% FeCo magnets were synthesized by high energy ball milling followed by consolidation into bulk shape by the spark plasma sintering technique. The evolution of magnetic properties was systematically investigated in milled powders as well as in spark plasma sintered samples. A high energy…
Multi-walled carbon nanotubes (MWCNTs) are important materials with a unique combination of mechanical, electrical and thermal properties. MWCNTs usually exist as tangled aggregates embedding impurities such as catalysts or amorphous carbon. Therefore, purification and cutting process are essential processes to get th…
Abstract Materials were evaluated in laboratory tests for a fire blocking blanket to protect stores of U.S. Army munitions from burning material and hot fragments. The objective of testing was to evaluate and rank materials' ability to resist the penetration of flame and heat and to limit flame spread. Materials in al…
We report the creation of unusual biaxial textures in Cu nanorod films, through the control of the incident vapor flux during oblique angle deposition. High-density twin boundaries were formed using a periodic azimuthal swing rotation of the substrate while the incident angle of the Cu flux was fixed at 85° with respe…
In this paper we address from the fundamental point of view the links and relations between three different phenomena that emerge when metallic films are perforated with periodic arrays of holes: (i) the phenomenon of extraordinary optical transmission in single metallic layers, (ii) the appearance of surface electrom…
The effect of xylanase treatment of eucalyptus wood chips on chip refining and fiber properties was investigated. The fiber separation region and fiber surface structure were observed with SEM, TEM, and AFM. The fiber length and fines were analyzed with a Bauer-McNett classifier and optical image analysis of flowing s…
In this work we show that the spreading Ohmic resistance of a quasi-two-dimensional system of size $\ensuremath{\Omega}$, thickness $t$, and with a constriction of size $W$ connecting two half-parts of resistivity $\ensuremath{\rho}$ goes as $(2\ensuremath{\rho}/\ensuremath{\pi}t)\text{ln}(\ensuremath{\Omega}/W)$, div…
Thermoelectric (TE) modules are possible reversible pre-cooling and pre-heating devices for ventilation air in buildings. In this study, the opportunity of direct coupling of TE modules with photovoltaic (PV) cells is considered. This coupling is evaluated through a numerical simulation depending on the meteorological…
Superhydrophobic surfaces in Wenzel and metastable wetting state were prepared and the conversion of such surfaces to ultraphobic surfaces was reported by the application of a fine-scale roughness. Silicon nitride substrates with hexagonally arranged pillars were prepared by micromachining. The two-scale roughness was…
We synthesized various graft copolymer films of poly(ethylene glycol) methacrylate (PEGMA) and methyl methacrylate (MMA) on silicon to examine the dependency of protein-surface interactions on grafting composition. We optimized atom transfer radical polymerizations to achieve film thicknesses from 25 to 100 nm dependi…
Growth of Pseudomonas aeruginosa on acyclic terpene alcohols (citronellol) and on other methyl-branched compounds such as leucine or isovalerate requires a functional leucine/isovalerate utilization (Liu) pathway. In this study, we investigated the liuABCDE gene cluster by insertion mutant analysis, heterologous expre…
The influence of disorder and defects is of fundamental relevance in the performance of nanotube-based devices. It is then crucial to understand the properties of (as-grown or in situ created) defects in order to conquer their detrimental effects, but also to tune nanotube properties in a desired direction. We show ex…
CO oxidation and decomposition behaviors over nanosized 3% Au/alpha-Fe2O3 catalyst and over the alpha-Fe2O3 support were studied in situ via thermogravimetry coupled to on-line FTIR spectroscopy (TG-FTIR), which was used to obtain temperature-programmed reduction (TPR) curves and evolved gas analysis. The catalyst was…
Ab initio calculations within the framework of hybrid density functional theory and the finite cluster approximation have been performed for the electronic and geometric structures of three different types of armchair germanium carbide nanotube, from (3, 3) to (11, 11). Full geometry and spin optimizations with unrest…
The nitrogen-related phosphotransferase system (Ntr-PTS) is a paralogous system working in parallel to the well-known carbohydrate:PTS. In a chain of phosphotransfer reactions, EINtr and NPr (PtsO) deliver phosphoryl groups to the EIIANtr (PtsN) protein. EIIANtr is implicated in important regulatory processes such as…
In this paper we use spatially variant metamaterial substrate to manipulate the directivity of antennas. We show theoretically that by embedding a dipole at different locations inside this substrate, the emitted rays can be directed to different orientations as required. As a result, spatial multiplexing can be realiz…