Materials Literature
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The effects of microbially fouling biofilm on corrossion behavior of metallic materials is reviewed in this article which covers microorganism in an extreme condition and its related corrosion,deterioration of water in the system of aeroplane and astronauts caused by the fouling biofilm and the methods in the microbia…
Empty fruit bunches (EFB), fiber, and shell are the main solid residues produced duringextraction of oil from oil palm (Elaeis guineensis Jacq.). Thermogravimetric (TG) and DifferentialScanning Calorimetry (DSC) analyses of these materials were carried out on samples as receivedand after solvent extraction. Presence o…
Spacecraft orbiting below about 300 nm are exposed to a high flux of atomic oxygen (AO) that can severely degrade surface materials, yet some coatings used on solar cell coverglass have never been qualified in this environment. Combined effects tests comprising atomic oxygen exposure, illumination, and temperature wer…
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In this paper we report on the thermoluminescence of Cs2LiYCl6, Cs2LiYCl6:Ce3+and Cs2LiYCl6:Pr3+crystals. Low-temperature glow curves and isothermal decay spectra are presented. All three crystals exhibit prominent glow peaks below 300 K: The Cs2LiYCl6sample shows a major peak at 58 K in addition to a broad band betwe…
Nanostructure materials exhibit different properties from those of corresponding bulk substances, the decrease in the grain size of the material leads to a drastic increase in the density of grain boundaries, which brings out a significant reduction in thermal conductivity, kappa, and so improve the value of thermoele…
Cu-doped Ba0.7Sr0.3TiO3 (BST) thin films were prepared on Pt(111)/Ti/SiO2/Si(100) substrates by a sol-gel spin coating process. The coated thin films were annealed at 750°C for 3 min in oxygen, air and nitrogen atmospheres by a rapid thermal annealing process. All of the Cu-doped BST thin films were consisted of a sin…
Nonradiative dielectric (NRD) waveguides comprised of time-dispersive isotropic double-negative or single-negative slabs sandwiched between metal plates are studied. Dispersion features of bound (surface) modes are considered, showing how to achieve ranges of unimodal backward propagation by means of epsilon-negative…
This paper presents results of a study on the electrochemical and etching behavior of Ge in alkaline hexacyanoferrate solutions.A detailed analysis of the current-potential behavior in these solutions allowed important conclusions to be drawn concerning the anodic dissolution mechanism of Ge.It was found that some oxi…
Novel alkaline developable top-coat materials containing a bulky silicon group are presented. This bulky silicon group endows transparency at 193nm wavelength and hydrophobicity to the top-coat. Good pattern profiles and negligible changes of lithographic performance are confirmed on ArF photoresists. Receding angle o…
We describe and test a simple method for calculating the viscosity coefficient η for liquid metals over a range of densities and temperatures. The method uses a model of atomic motion in a liquid based on the vibration‐transit (V‐T) theory of liquid dynamics to calculate the self‐diffusion coefficient D, and then uses…
Results are presented of the development of explosive forming technology for metal sheets and plates. Explosive forming is labor intensive, but requires only single‐sided tooling it can be used economically for small series of hard to deform metals, like nickel, titanium and aluminum alloys, that are generally used in…
Over the last several years, many experiments have been conducted to study the dynamic response of U‐Nb (6 wt.%) alloy. An understanding of the physical mechanisms governing the behavior of this material is necessary to develop robust physical models for today’s hydrocodes. Previous experiments indicate that the dynam…
When uranium‐niobium (6 wt.%) alloy is shock loaded, the expected elastic precursor is absent. A prior model attributed this absence to shear‐induced twinning and the concomitant shear stress reduction that prevented the shocked material from reaching the plastic yield point. In the present study, carefully prepared U…
It can be obtained from hydrocarbon and water, specially production of hydrogen from natural gas is most commercial and economical process among the hydrogen production methods, and has been used widely. However, conventional hydrogen production methods are dependent on fossil fuel such as natural gas and coal, and it…
Activated carbons and other types of porous carbons have attracted many attentions in several industrial fields currently. However, experimental results for characterization of the structure of porous carbons show no distinct features, and accordingly the structural information obtained from the experimental results h…
The main objective of this work was to evaluate the effectiveness of the chemical vapour deposition (CVD) technique for the whiskerization treatment of polyacrylonitrile (PAN) based carbon fibers. Carbon whiskers were produced by a benzene-ferrocene gas reaction inside a high temperature tube furnace. The work focuses…
The synthesis of photochromic 3,3‐di(4 ′ ‐fluorophenyl)‐3H‐benzopyrans fused to an indole moiety is described. The structures of photomerocyanines elucidated by NMR spectroscopy and spectrokinetic data ( λ max of colored form, colorability, and rate constant of bleaching) obtained by UV‐visible spectroscopy are repor…
In the present work, the spin properties of single Nitrogen-Vacancy (NV) defect centers in diamond are investigated, in perspective to their application to quantum computing. One of the actual approaches to quantum computing is based on spins, and, therefore, their behavior and properties related to manipulation and r…
This paper discusses a number of optical devices that fabricated from mesoporous silicon to highlight the excellent device qualities and ease of fabrication which is achievable using PSi. Specifically, the paper discusses about the design and properties of devices with continuously varying refractive index profiles. T…