Materials Literature
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Direct growth of individual and vertically aligned carbon nanotubes (CNT) onto a metallic tip apex using a two-chamber radio-frequency plasma-enhanced chemical vapor deposition reactor is reported. Individual Ni nanocatalysts were the sites for the nucleation of individual CNTs that were freestanding, clean, and verti…
Abstract The nature and origin of the clay mineralogy of the Jurassic strata of the British Isles are described and discussed within their lithological and biostratigraphical framework using published and unpublished sources as well as 1800 new clay mineral analyses. Regional clay mineral variation is described system…
Abstract ZnO nanostructures are expected to pave the way for many interesting applications in optoelectronics, spin electronics gas sensor technology and biomedicine. Fabrication methods, especially for nanorods have been based mostly on catalyst‐assisted growth methods that employ metal‐organic sources and other cont…
Silica‐coated lanthanum–strontium manganite particles with La 0.76 Sr 0.24 MnO 3+δ stoichiometric formula, exhibiting Curie temperature at ∼40°C, were prepared by using a traditional solid‐state method of synthesis of magnetic ceramic particles, followed by milling and a low‐temperature coating procedure in an aqueous…
Photoluminescence and positron annihilation spectroscopy have been used to characterize and identify vacancy-type defects produced in ZnO films grown on sapphire by metal-organic chemical-vapor deposition. The photoluminescence of the samples in the near band edge region has been studied, paying particular attention t…
Polycarbonate (PC) was modified with organic-inorganic nanostructured acrylate polymer and its tensile and impact properties were studied. The PC alloys exhibited higher flexibility than pure PC and the tensile strength hardly decreased with the addition of the modifiers. The SEM results indicated that the inorganic p…
Abstract (Zn,Mn)S nanoparticles with Mn concentrations ranging from 1% to 30% and in a wire‐like arrangement were formed inside mesoporous SiO 2 matrices of various pore diameters. The nanoparticles were characterised using photoluminescence and excitation spectroscopy. It is found, that the Mn 2+ ions are incorporate…
Plastic strain macrolocalization at the parabolic stage of strain hardening in Zr-1 wt% Nb alloy is studied. The plastic flow is found to be unstable, which shows up as the oscillatory periodic space-time variation of the local strain distribution. The results are discussed in terms of a synergetic model of plastic fl…
Abstract Using the well established MBE process, we introduced colloidal nanocrystals (NCs) into monocrystalline semiconductor layers. CdSe nanorods (NRs) and CdSe(ZnS) core‐shell nanodots (NDs) with radii R between 2 and 4 nm on a ZnSe surface are capped by thin ( d ∼ 2 R ) and thick ( d > 2 R ) MBE‐grown ZnSe lay…
Abstract We report an experimental study of the conductivity switching effect in mono and polycrystalline layers of Cd 1–x Zn x Te grown by MBE on the Si(001)/Au and n + ‐ GaAs(001) substrates. The current‐voltage (I‐V) characteristics of metal‐semiconductor junctions show that the conductivity of the Cd 1–x Zn x Te s…
We report an assembled microelectromechanical system (MEMS) electrostatic microcolumn design that employs a multiwall carbon nanotube emitter as an electron source. The microcolumn is designed for a beam diameter of 10–20 nm with a beam energy of 1 keV at currents of up to 1 nA and a 100μm field of view. The maximum v…
The Structure-Function Linkage Database (SFLD; http://sfld.rbvi.ucsf.edu/) is a Web-accessible database designed to link enzyme sequence, structure, and functional information. This unit describes the protocols by which a user may query the database to predict the function of uncharacterized enzymes and to correct mis…
Abstract Direct evidence that dominant shallow donors in undoped ZnO are mobile defects has been obtained. It has been found that these donors influence not only electrical conductivity, but also optical absorption and luminescence. Migration of mobile donors in crystal lattice, which can be already observed at 300 K,…
A spectroscopic investigation of corona discharges in SF6/N2 gas mixtures has been undertaken using an optical multichannel analyser (OMA). A point-to-plane geometry has been used with point radii varying from 3 to 10 μm. Spectra are measured for high pressures ranging from 0.2 MPa up to 1.4 MPa and for different conc…
The engineering design of texti les conti nues to fol low the traditional empirical methods and for technical as distinct from aesthetic design has not adopted computer-aided design as used in other industries. The reasons for this and the need for change have been discussed. This paper reviews the state-of-the-art in…
Abstract The physical properties during long term storage of selected commercial Standard Thai Rubbers (STR), i.e. STR XL, STR 5L and STR CV60 as high-graded natural rubber (NR), were investigated. Sections of commercial NR were subjected to examination after storage-hardening. STR 5L showed clearly an increase in Moo…
Alzheimer's disease (AD) related beta amyloid (Aβ) peptides possess high propensity towards aggregation. Their diffusion-controlled association follows a physico-chemically well-defined kinetics: the fibrillization starts from the monomeric/ dimeric state, and proceeds in the direction of oligomeric→protofibrillar→ fi…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
A measuring system has been developed to investigate the characteristics of radiation-induced optical absorption and radioluminescence in the spectral range of 400–1000 nm for a set of optical fibers being irradiated by fast neutrons and γ rays. This system has been used on the IR-8 research nuclear reactor to perform…
An ensemble averaging technique is used to obtain both macroscopic equations of transport phenomena in a two-phase region and new models of permeability and thermal conductivity of the columnar mushy zone through the analysis of most likely configurations of the local microstructure. The obtained formulae are incorpor…