Materials Literature
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Space charge formation in various glass materials under electron beam irradiation was investigated. The charging of spacecrafts occurs in plasma and radiation environments. In particular, we focused on an accident caused by internal charging in a glass material that was used as the cover plate of a solar panel array,…
Stochastic subwavelength structures on polymethylmetacrylate (PMMA) surfaces were produced by low-pressure argon/oxygen plasma treatment. The modified surfaces show antireflective properties exhibiting low scattering losses depending on the size and the density of the structure. It is demonstrated that the antireflect…
Silicon nitride films (p-SiN) with different high stresses were formed by changing the monosilane-to-ammonia source gas ratio, RF power, and deposition temperature in a conventional plasma-enhanced chemical vapor deposition (PECVD). PECVD was used to deposit p-SiN films with high-stresses because it can flexibly chang…
Layered perovskite La2CuO4+δ (LCO) thin films were epitaxially grown on SrTiO3 (STO) and LaSrAlO4 substrates by atomic-layer-by-layer molecular beam epitaxy. The lattice defects and residual strain in these films were investigated by means of transmission electron microscopy and electron energy loss spectroscopy. The…
The photochemical surface modification of silicone ([SiO(CH 3 ) 2 ] n ) rubber has been successfully demonstrated using a 193 nm ArF excimer laser, and white light of strong intensity was emitted upon exposure to a 325 nm He–Cd laser. The photoluminescence spectra of the modified silicone showed broad peaks centered a…
Transparent Mg-Al spinel ceramics of four different nonstoichiometries were obtained utilizing two-stage sintering technique of vacuum sintering and post hot isostatic pressing using MgO·nAl2O3 powders with n of 1, 1.3, 1.5 and 1.8, respectively, as raw materials. The mechanical properties of the ceramics were measure…
Local cathodoluminescence spectroscopy has been suggested for the development of durable self-glowing crystals based on crystalline solid solutions (Y, Eu)PO 4 . Nonradioactive ions of Eu 3+ in these crystals cause strong luminescence in the visible range, initiated by small admixture (less than 1 wt %) of α-radioacti…
Postdeposition chemical etching of spectral-hole filters, which were fabricated as chiral sculptured thin films with central 90-deg-twist defects, decreases the cross-sectional dimensions of the helical columns that such films comprise and blueshifts the spectral holes, thereby establishing the efficacy of postdeposit…
The pulsed laser ablation and deposition (PLD) processes of SrTiO 3 were studied as a model system for developing a technique for the growth of structurally bulk-equivalent epitaxial thin films of typical complex oxides. Deposition rate vs. laser fluence measurements showed that there is a second critical fluence valu…
The dielectric behavior of tetragonal (Pb1−xLax)(Zr0.4Ti0.6)O3 (PLZT x∕40∕60) ceramics doped with lanthanum (x=12% and 15%) has been investigated from 102to1014Hz in the temperature range of 20–800K. Relaxor ferroelectric behavior, together with a first-order ferroelectric phase transition at TC below the dielectric m…
The main topic of this paper is an analysis of experimental results for three kinds of sheet steel: DP600, TRIP700 and H340LAD, which are used in the automotive industry. Such results were partly reported earlier in [1]. For comparison purposes the experimental results obtained at LPMM for an ES (DC05) mild steel have…
Space-borne optical systems must be tolerant to radiation to guarantee that the required system performance is maintained during prolonged mission times. We show that the radiation hardness can be improved by selecting the relevant glass from a group of optical analogs. This conclusion is based on the study of gamma-r…
ABSTRACT Incorporating air bubbles into foods is a technical challenge, and in all cases, the fabrication of a foam goes through a “wet foam” stage, where bubbles are diluted in the food matrix and require stabilization. Sometimes, the end product is itself a wet foam, and a popular example is ice cream. This article…
The structure of gillardite, the Ni-analogue [ideally Cu3NiCl2(OH)6] of herbertsmithite [ideally Cu3ZnCl2(OH)6] has been determined at 273(2) K. The crystal used was removed from a sample from the 132N nickel deposit at Widgiemooltha, Western Australia, Australia. Seventeen electron-microprobe analyses gave compositio…
The aim of this study is to determine the interfacial adhesion of Arenga Pinnata fiber and epoxy matrix after undergoing a tensile test. The specimens of Arenga Pinnata fiber reinforced epoxy composites were prepared at various fiber weights of 10%, 15% and 20% with different fiber orientations such as woven roving, l…
Monometallic (Au and Ni) and bimetallic (Au + Ni) nanoparticles deposited on SiO2 from colloidal solutions in triethylamine have been studied by x-ray photoelectron spectroscopy (XPS). The solutions were prepared through vapor-phase metal synthesis. We have determined the basic parameters of the core-level and valence…
Coating surfaces with a protective layer is a common method to protect artwork from deterioration. These layers consist often of organic substances such as acrylic resins. Due to weathering and ageing polymers usually suffer changes in optical properties and these organic coats also reduce the water-permeability of po…
A novel supramolecular self-assembly, where a pyridyl-substituted perylene bisimide dye (DPyPBI) axially binds to zinc phthalocyanine (ZnPc), has been designed. Their coordination properties have been studied by UV/vis, fluorescence techniques and 1H NMR spectroscopy, showing that 1:1 and 1:2 double sandwich complexes…
In this paper support vector machine (SVM) has been used for optimization of electric field along the support insulators used in high voltage (HV) systems. To illustrate the effectiveness of SVM in optimizing electric field problems, two axi-symmetric cases have been considered one having an insulator with a contour t…
Uni- and multicellular microorganisms are capable of performing a variety of functions. Many of these self-replicating biological entities can synthesize and structure materials, sense, convert energy, communicate, and generate mechanical motion. From an engineering vantage point, these microorganisms may be considere…